Add docs to master

Support %r - request id - output file pattern #381

.dockerignore

@@ -0,0 +1,3 @@
+*.tar.gz
+gor
+gor.test

.gitignore

@@ -0,0 +1,26 @@
+*.swp
+*.gor
+
+*.out
+
+*.bin
+
+*.gz
+*.zip
+
+*.class
+
+*.test
+.idea
+*.iml
+gor
+
+*.mprof
+
+*.pcap
+
+.DS_Store
+
+corpus
+crashers
+suppressions

.gitmodules

@@ -0,0 +1,15 @@
+[submodule "vendor/github.com/mattbaird/elastigo"]
+	path = vendor/github.com/mattbaird/elastigo
+	url = https://github.com/mattbaird/elastigo
+[submodule "vendor/github.com/araddon/gou"]
+	path = vendor/github.com/araddon/gou
+	url = https://github.com/araddon/gou
+[submodule "vendor/github.com/bitly/go-hostpool"]
+	path = vendor/github.com/bitly/go-hostpool
+	url = https://github.com/bitly/go-hostpool
+[submodule "vendor/github.com/bmizerany/assert"]
+	path = vendor/github.com/bmizerany/assert
+	url = https://github.com/bmizerany/assert
+[submodule "vendor/github.com/google/gopacket"]
+	path = vendor/github.com/google/gopacket
+	url = https://github.com/google/gopacket

.travis.yml

@@ -0,0 +1,6 @@
+language: go
+go: 1.6
+script: sudo -E bash -c "source /etc/profile && eval '$(gimme 1.6)' && export GOPATH=$HOME/gopath:$GOPATH && go get && GORACE='halt_on_error=1' go test ./... -v -timeout 120s -race"
+
+before_install:
+  - sudo apt-get install libpcap-dev -y

CHANGELOG.md

@@ -1,5 +0,0 @@
-v0.3 - 10 Jun 2013
-* Use RAW_SOCKETS instead of tcpdump
-* Own TCP stack
-* All HTTP request types support
-* Simplified request parsing

COMM-LICENSE

@@ -0,0 +1,93 @@
+END-USER LICENSE AGREEMENT
+
+------------------------------------------------------------------------------
+
+IMPORTANT: THIS SOFTWARE END-USER LICENSE AGREEMENT ("EULA") IS A LEGAL AGREEMENT (“Agreement”) BETWEEN YOU (THE CUSTOMER, EITHER AS AN INDIVIDUAL OR, IF PURCHASED OR OTHERWISE ACQUIRED BY OR FOR AN ENTITY, AS AN ENTITY) AND GoReplay LLC. READ IT CAREFULLY BEFORE COMPLETING THE INSTALLATION PROCESS AND USING GOREPLAY PRO AND RELATED SOFTWARE COMPONENTS (“SOFTWARE”). IT PROVIDES A LICENSE TO USE THE SOFTWARE AND CONTAINS WARRANTY INFORMATION AND LIABILITY DISCLAIMERS. BY INSTALLING AND USING THE SOFTWARE, YOU ARE CONFIRMING YOUR ACCEPTANCE OF THE SOFTWARE AND AGREEING TO BECOME BOUND BY THE TERMS OF THIS AGREEMENT.
+
+------------------------------------------------------------------------------
+
+In order to use the Software under this Agreement, you must receive a “Source URL” at the time of purchase, in accordance with the scope of use and other terms specified for each type of Software and as set forth in this Section 1 of this Agreement. 
+
+1. License Grant
+
+1.1 General Use. This Agreement grants you a non-exclusive, non-transferable, limited license to the use rights for the Software, without the right to grant sublicenses, subject to the terms and conditions in this Agreement. The Software is licensed, not sold.
+
+1.2 Unlimited Organization License. If you purchased an Organization License (included with the GoReplay Pro Software), you may install the Software on an unlimited number of Hosts. “Host” means any physical or virtual machine which is controlled by you. You may concurrently run the software on an unlimited number of Hosts.
+
+1.3 Appliance License. If you purchased an Appliance License, you may distribute the Software in any applications, frameworks, or elements (collectively referred to as an “Application” or “Applications”) that you develop using the Software in accordance with this EULA, provided that such distribution does not violate the restrictions set forth in section 3 of this EULA. You must not remove, obscure or interfere with any copyright, acknowledgment, attribution, trademark, warning or disclaimer statement affixed to, incorporated in or otherwise applied in connection with the Software. You are required to ensure that the Software is not reused by or with any applications other than those with which you distribute it as permitted herein. For example, if You install the Software on a customer’s server, that customer is not permitted to use the Software independently of your Application. You must inform GoReplay LLC of your knowledge of any infringing use of the Software by any of your customers. You are liable for compliance by those third parties with the terms and conditions of this EULA. You will not owe GoReplay LLC any royalties for your distribution of the Software in accordance with this EULA.
+
+1.4 Archive Copies. You are entitled to make a reasonable amount of copies of the Software for archival purposes. Each copy must reproduce all copyright and other proprietary rights notices on or in the Software Product.
+
+1.5 Electronic Delivery. All Software and license documentation shall be delivered by electronic means unless otherwise specified on the applicable invoice or at the time of purchase. Software shall be deemed delivered when it is made available for download by you (“Delivery”).        
+
+2. Modifications. GoReplay LLC shall provide you with source code so that you can create Modifications of the original software. “Modification” means: (a) any addition to or deletion from the contents of a file included in the original Software or previous Modifications created by You, or (b) any new file that contains any part of the original Software or previous Modifications. While you retain all rights to any original work authored by you as part of the Modifications, We continue to own all copyright and other intellectual property rights in the Software.
+
+3. Restricted Uses. 
+
+3.1 You shall not (and shall not allow any third party to): (a) decompile, disassemble, or otherwise reverse engineer the Software or attempt to reconstruct or discover any source code, underlying ideas, algorithms, file formats or programming interfaces of the Software by any means whatsoever (except and only to the extent that applicable law prohibits or restricts reverse engineering restrictions); (b) distribute, sell, sublicense, rent, lease or use the Software for time sharing, hosting, service provider or like purposes, except as expressly permitted under this Agreement; (c) redistribute the Software or Modifications other than by including the Software or a portion thereof within your own product, which must have substantially different functionality than the Software or Modifications and must not allow any third party to use the Software or Modifications, or any portions thereof, for software development or application development purposes; (d) redistribute the Software as part of a product, "appliance" or "virtual server"; (e) redistribute the Software on any server which is not directly under your control; (f) remove any product identification, proprietary, copyright or other notices contained in the Software; (g) modify any part of the Software, create a derivative work of any part of the Software (except as permitted in Section 4), or incorporate the Software, except to the extent expressly authorized in writing by GoReplay LLC; (h) publicly disseminate performance information or analysis (including, without limitation, benchmarks) from any source relating to the Software; (i) utilize any equipment, device, software, or other means designed to circumvent or remove any form of Source URL or copy protection used by GoReplay LLC in connection with the Software, or use the Software together with any authorization code, Source URL, serial number, or other copy protection device not supplied by GoReplay LLC; (j) use the Software to develop a product which is competitive with any GoReplay LLC product offerings; or (k) use unauthorized Source URLS or keycode(s) or distribute or publish Source URLs or keycode(s), except as may be expressly permitted by GoReplay LLC in writing. If your unique Source URL is ever published, GoReplay LLC reserves the right to terminate your access without notice.
+
+3.2 UNDER NO CIRCUMSTANCES MAY YOU USE THE SOFTWARE AS PART OF A PRODUCT OR SERVICE THAT PROVIDES SIMILAR FUNCTIONALITY TO THE SOFTWARE ITSELF.
+
+The Open Source version of the Software (“LGPL Version”) is licensed
+under the terms of the GNU Lesser General Public License versions 3.0
+(“LGPL”) and not under this EULA. 
+
+4. Ownership. Notwithstanding anything to the contrary contained herein, except for the limited license rights expressly provided herein, GoReplay LLC and its suppliers have and will retain all rights, title and interest (including, without limitation, all patent, copyright, trademark, trade secret and other intellectual property rights) in and to the Software and all copies, modifications and derivative works thereof (including any changes which incorporate any of your ideas, feedback or suggestions). You acknowledge that you are obtaining only a limited license right to the Software, and that irrespective of any use of the words “purchase”, “sale” or like terms hereunder no ownership rights are being conveyed to you under this Agreement or otherwise. 
+
+5. Fees and Payment. The Software license fees will be due and payable in full as set forth in the applicable invoice or at the time of purchase. If the Software does not function properly within two weeks of purchase, please contact us within those two weeks for a refund. You shall be responsible for all taxes, withholdings, duties and levies arising from the order (excluding taxes based on the net income of GoReplay LLC). 
+
+6. Support, Maintenance and Services. Subject to the terms and conditions of this Agreement, as set forth in your invoice, and as set forth on the GoReplay Pro support page (https://github.com/buger/gor/wiki/Pro-Support), support and maintenance services may be included with the purchase of your license subscription.
+
+7. Term of Agreement. 
+
+7.1 Term. This Agreement is effective as of the Delivery of the Software and expires at such time as all license and service subscriptions hereunder have expired in accordance with their own terms (the “Term”). For clarification, the term of your license under this Agreement may be perpetual, limited for Evaluation Version, or designated as a fixed-term license in the Invoice, and shall be specified at your time of purchase. Either party may terminate this Agreement (including all related Invoices) if the other party: (a) fails to cure any material breach of this Agreement within thirty (30) days after written notice of such breach, provided that GoReplay LLC may terminate this Agreement immediately upon any breach of Section 3 or if you exceed any other restrictions contained in Section 1, unless otherwise specified in this agreement; (b) ceases operation without a successor; or (c) seeks protection under any bankruptcy, receivership, trust deed, creditors arrangement, composition or comparable proceeding, or if any such proceeding is instituted against such party (and not dismissed within sixty (60) days)). Termination is not an exclusive remedy and the exercise by either party of any remedy under this Agreement will be without prejudice to any other remedies it may have under this Agreement, by law, or otherwise.        
+
+7.2 Termination. Upon any termination of this Agreement, you shall cease any and all use of any Software and destroy all copies thereof. 
+
+7.3 Expiration of License. Upon the expiration of any term under this Agreement, (a) all Software updates and services pursuant to the license shall cease, (b) you may only continue to run existing installations of the Software, (c) you may not install the Software on any additional Hosts, and (d) any new installation of the Software shall require the purchase of a new license subscription from GoReplay LLC.
+
+8. Disclaimer of Warranties. The Software is provided "as is," with all faults, defects and errors, and without warranty of any kind. GoReplay LLC does not warrant that the Software will be free of bugs, errors, viruses or other defects, and GoReplay LLC shall have no liability of any kind for the use of or inability to use the Software, the Software content or any associated service, and you acknowledge that it is not technically practicable for GoReplay LLC to do so. 
+To the maximum extent permitted by applicable law, GoReplay LLC disclaims all warranties, express, implied, arising by law or otherwise, regarding the Software, the Software content and their respective performance or suitability for your intended use, including without limitation any implied warranty of merchantability, fitness for a particular purpose.
+
+9. Limitation of Liability. 
+
+In no event will GoReplay LLC be liable for any direct, indirect, consequential, incidental, special, exemplary, or punitive damages or liabilities whatsoever arising from or relating to the Software, the Software content or this Agreement, whether based on contract, tort (including negligence), strict liability or other theory, even if GoReplay LLC has been advised of the possibility of such damages.
+
+In no event will GoReplay LLC liability exceed the Software license price as indicated in the invoice. The existence of more than one claim will not enlarge or extend this limit.
+
+10. Remedies. Your exclusive remedy and GoReplay LLC’ entire liability for breach of this Agreement shall be limited, at GoReplay LLC’ sole and exclusive discretion, to (a) replacement of any defective software or documentation; or (b) refund of the license fee paid to GoReplay LLC, payable in accordance with GoReplay LLC' refund policy.
+
+11. Acknowledgements.
+
+11.1 Consent to the Use of Data. You agree that GoReplay LLC and its affiliates may collect and use technical information gathered as part of the product support services. GoReplay LLC may use this information solely to improve products and services and will not disclose this information in a form that personally identifies you.
+
+11.2 Verification. We or a certified auditor acting on our behalf, may, upon its reasonable request and at its expense, audit you with respect to the use of the Software. Such audit may be conducted by mail, electronic means or through an in-person visit to your place of business. Any such in-person audit shall be conducted during regular business hours at your facilities and shall not unreasonably interfere with your business activities. We shall not remove, copy, or redistribute any electronic material during the course of an audit. If an audit reveals that you are using the Software in a way that is in material violation of the terms of the EULA, then you shall pay our reasonable costs of conducting the audit. In the case of a material violation, you agree to pay Us any amounts owing that are attributable to the unauthorized use. In the alternative, We reserve the right, at our sole option, to terminate the licenses for the Software.
+
+11.3 Government End Users. If the Software and related documentation are supplied to or purchased by or on behalf of the United States Government, then the Software is deemed to be "commercial software" as that term is used in the Federal Acquisition Regulation system. Rights of the United States shall not exceed the minimum rights set forth in FAR 52.227-19 for "restricted computer software". All other terms and conditions of this Agreement apply.
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+12. Third Party Software.  Examples included in Software may provide links to third party libraries or code (collectively “Third Party Software”) to implement various functions. Third Party Software does not comprise part of the Software. In some cases, access to Third Party Software may be included along with the Software delivery as a convenience for demonstration purposes. Such source code and libraries may be included in the “…/examples” source tree delivered with the Software and do not comprise the Software. Licensee acknowledges (1) that some part of Third Party Software may require additional licensing of copyright and patents from the owners of such, and (2) that distribution of any of the Software referencing or including any portion of a Third Party Software may require appropriate licensing from such third parties.
+
+
+13. Miscellaneous
+
+13.1 Entire Agreement. This Agreement sets forth our entire agreement with respect to the Software and the subject matter hereof and supersedes all prior and contemporaneous understandings and agreements whether written or oral.
+
+13.2 Amendment. GoReplay LLC reserves the right, in its sole discretion, to amend this Agreement from time. Amendments to this Agreement can be located at: https://github.com/buger/gor/blob/master/COMM-LICENSE.
+
+13.3 Assignment. You may not assign this Agreement or any of its rights under this Agreement without the prior written consent of GoReplay LLC and any attempted assignment without such consent shall be void.
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+13.4 Export Compliance. You agree to comply with all applicable laws and regulations, including laws, regulations, orders or other restrictions on export, re-export or redistribution of software.
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+13.5 Indemnification. You agree to defend, indemnify, and hold harmless GoReplay LLC from and against any lawsuits, claims, losses, damages, fines and expenses (including attorneys' fees and costs) arising out of your use of the Software or breach of this Agreement.
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+13.6 Governing Law. This Agreement is governed by the laws of the State of Oregon and the United States without regard to conflicts of laws provisions thereof, and without regard to the United Nations Convention on the International Sale of Goods or the Uniform Computer Information Transactions Act, as currently enacted by any jurisdiction or as may be codified or amended from time to time by any jurisdiction. The jurisdiction and venue for actions related to the subject matter hereof shall be the state of Oregon and United States federal courts located in Portland, Oregon, and both parties hereby submit to the personal jurisdiction of such courts. 
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+13.7 Attorneys’ Fees and Costs. The prevailing party in any action to enforce this Agreement will be entitled to recover its attorneys’ fees and costs in connection with such action. 
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+13.8 Severability. If any provision of this Agreement is held by a court of competent jurisdiction to be invalid, illegal, or unenforceable, the remainder of this Agreement will remain in full force and effect.
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+13.9 Waiver. Failure or neglect by either party to enforce at any time any of the provisions of this licence Agreement shall not be construed or deemed to be a waiver of that party's rights under this Agreement.
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+13.10 Headings. The headings of sections and paragraphs of this Agreement are for convenience of reference only and are not intended to restrict, affect or be of any weight in the interpretation or construction of the provisions of such sections or paragraphs.
+
+14. Contact Information. If you have any questions about this EULA, or if you want to contact GoReplay LLC for any reason, please direct correspondence to info@gortool.com

Dockerfile

@@ -0,0 +1,24 @@
+FROM golang:latest
+
+RUN apt-get update && apt-get install ruby vim-common -y
+
+# Install Java for middleware testing
+RUN echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee /etc/apt/sources.list.d/webupd8team-java.list
+RUN echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list
+RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
+RUN apt-get update -y
+RUN echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections
+RUN apt-get install oracle-java8-installer -y
+
+RUN apt-get install flex bison -y
+RUN wget http://www.tcpdump.org/release/libpcap-1.7.4.tar.gz && tar xzf libpcap-1.7.4.tar.gz && cd libpcap-1.7.4 && ./configure && make install
+RUN go get github.com/google/gopacket
+RUN go get -u github.com/golang/lint/golint
+
+WORKDIR /go/src/github.com/buger/gor/
+ADD . /go/src/github.com/buger/gor/
+
+RUN wget http://archive.apache.org/dist/commons/io/binaries/commons-io-2.4-bin.tar.gz && tar xzf commons-io-2.4-bin.tar.gz && cd commons-io-2.4 && mv commons-io-2.4.jar /tmp/
+RUN wget http://archive.apache.org/dist/commons/codec/binaries/commons-codec-1.9-bin.tar.gz && tar xzf commons-codec-1.9-bin.tar.gz
+RUN javac -cp commons-io-2.4/commons-io-2.4.jar -cp commons-codec-1.9/commons-codec-1.9.jar ./examples/middleware/echo.java
+RUN go get

ELASTICSEARCH.md

@@ -0,0 +1,65 @@
+gor & elasticsearch
+===================
+
+Prerequisites
+-------------
+
+- elasticsearch
+- kibana (Get it here: http://www.elasticsearch.org/overview/kibana/)
+- gor
+
+
+elasticsearch
+-------------
+
+The default elasticsearch configuration is just fine for most workloads. You won't need clustering, sharding or something like that.
+
+In this example we're installing it on our gor replay server which gives us the elasticsearch listener on _http://localhost:9200_
+
+
+kibana
+------
+
+Kibana (elasticsearch analytics web-ui) is just as simple. 
+Download it, extract it and serve it via a simple webserver.
+(Could be nginx or apache)
+
+You could also use a shell, ```cd``` into the kibana directory and start a little quick and dirty python webserver with:
+
+```
+python -m SimpleHTTPServer 8000
+```
+
+In this example we're also choosing the gor replay server as our kibana host. If you choose a different server you'll have to point kibana to your elasticsearch host.
+
+
+gor
+---
+
+Start your gor replay server with elasticsearch option:
+
+```
+./gor --input-raw :8000 --output-http http://staging.com  --output-http-elasticsearch localhost:9200/gor
+```
+
+
+(You don't have to create the index upfront. That will be done for you automatically)
+
+
+Now visit your kibana url, load the predefined dashboard from the gist https://gist.github.com/gottwald/b2c875037f24719a9616 and watch the data rush in.
+
+
+Troubleshooting
+---------------
+
+The replay process may complain about __too many open files__.
+That's because your typical linux shell has a small open files soft limit at 1024.
+You can easily raise that when you do this before starting your _gor replay_ process:
+
+```
+ulimit -n 64000
+```
+
+Please be aware, this is not a permanent setting. It's just valid for the following jobs you start from that shell.
+
+We reached the 1024 limit in our tests with a ubuntu box replaying about 9000 requests per minute. (We had very slow responses there, should be way more with fast responses)

LICENSE.txt

@@ -0,0 +1,19 @@
+GoReplay is an Open Source project licensed under the terms of
+the LGPLv3 license.  Please see <http://www.gnu.org/licenses/lgpl-3.0.html>
+for license text.
+
+As a special exception to the GNU Lesser General Public License version 3
+("LGPL3"), the copyright holders of this Library give you permission to
+convey to a third party a Combined Work that links statically or dynamically
+to this Library without providing any Minimal Corresponding Source or
+Minimal Application Code as set out in 4d or providing the installation
+information set out in section 4e, provided that you comply with the other
+provisions of LGPL3 and provided that you meet, for the Application the
+terms and conditions of the license(s) which apply to the Application.
+
+TLDR: You are free to use Gor subpackages like `byteutils` or `proto` in your commercial projects.
+
+
+GoReplay Pro has a commercial-friendly license allowing private forks
+and modifications of GoReplay.  Please see https://goreplay.org/pro.html for
+more detail.  You can find the commercial license terms in COMM-LICENSE.

Makefile

@@ -0,0 +1,92 @@
+SOURCE = emitter.go gor.go gor_stat.go input_dummy.go input_file.go input_raw.go input_tcp.go limiter.go output_dummy.go output_null.go output_file.go input_http.go output_http.go output_tcp.go plugins.go settings.go test_input.go elasticsearch.go http_modifier.go http_modifier_settings.go http_client.go middleware.go protocol.go output_file_settings.go output_kafka.go
+SOURCE_PATH = /go/src/github.com/buger/gor/
+PORT = 8000
+FADDR = :8000
+RUN = docker run -v `pwd`:$(SOURCE_PATH) -p 0.0.0.0:$(PORT):$(PORT) -i -t gor
+BENCHMARK = BenchmarkRAWInput
+TEST = TestRawListenerBench
+VERSION = DEV-$(shell date +%s)
+LDFLAGS = -ldflags "-X main.VERSION=$(VERSION) -extldflags \"-static\""
+MAC_LDFLAGS = -ldflags "-X main.VERSION=$(VERSION)"
+FADDR = ":8000"
+
+release: release-x64 release-mac
+
+release-bin:
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=amd64  -i gor go build -tags netgo $(LDFLAGS)
+
+release-x64:
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=amd64  -i gor go build -tags netgo $(LDFLAGS) && tar -czf gor_$(VERSION)_x64.tar.gz gor && rm gor
+
+release-x86:
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=386 -i gor go build -tags netgo $(LDFLAGS) && tar -czf gor_$(VERSION)_x86.tar.gz gor && rm gor
+
+release-mac:
+	go build $(MAC_LDFLAGS) && tar -czf gor_$(VERSION)_mac.tar.gz gor && rm gor
+
+build:
+	docker build -t gor .
+
+
+profile:
+	go build && ./gor --output-http="http://localhost:9000" --input-dummy 0 --input-raw :9000 --input-http :9000 --memprofile=./mem.out --cpuprofile=./cpu.out --stats --output-http-stats --output-http-timeout 100ms
+
+lint:
+	$(RUN) golint $(PKG)
+
+race:
+	$(RUN) go test ./... $(ARGS) -v -race -timeout 15s
+
+test:
+	$(RUN) go test ./. -timeout 60s $(LDFLAGS) $(ARGS)  -v
+
+test_all:
+	$(RUN) go test ./... -timeout 60s $(LDFLAGS) $(ARGS) -v
+
+testone:
+	$(RUN) go test ./... -timeout 4s $(LDFLAGS) -run $(TEST) $(ARGS) -v
+
+cover:
+	$(RUN) go test $(ARGS) -race -v -timeout 15s -coverprofile=coverage.out
+	go tool cover -html=coverage.out
+
+fmt:
+	$(RUN) gofmt -w -s ./..
+
+vet:
+	$(RUN) go vet
+
+bench:
+	$(RUN) go test $(LDFLAGS) -v -run NOT_EXISTING -bench $(BENCHMARK) -benchtime 5s
+
+profile_test:
+	$(RUN) go test $(LDFLAGS) -run $(TEST) ./raw_socket_listener/. $(ARGS) -memprofile mem.mprof -cpuprofile cpu.out
+	$(RUN) go test $(LDFLAGS) -run $(TEST) ./raw_socket_listener/. $(ARGS) -c
+
+# Used mainly for debugging, because docker container do not have access to parent machine ports
+run:
+	$(RUN) go run $(LDFLAGS) $(SOURCE) --input-dummy=0 --output-http="http://localhost:9000" --input-raw-track-response --input-raw 127.0.0.1:9000 --verbose --debug --middleware "./examples/middleware/echo.sh" --output-file requests.gor
+
+run-2:
+	sudo -E go run $(SOURCE) --input-dummy="" --output-tcp localhost:27001 --verbose --debug
+
+run-3:
+	sudo -E go run $(SOURCE) --input-tcp :27001 --output-stdout
+
+run-arg:
+	sudo -E go run $(SOURCE) $(ARGS)
+
+file-server:
+	go run $(SOURCE) file-server $(FADDR)
+
+readpcap:
+	go run $(SOURCE) --input-raw $(FILE) --input-raw-engine pcap_file --output-null
+
+record:
+	$(RUN) go run $(SOURCE) --input-dummy=0 --output-file=requests.gor --verbose --debug
+
+replay:
+	$(RUN) go run $(SOURCE) --input-file=requests.bin --output-tcp=:9000 --verbose -h
+
+bash:
+	$(RUN) /bin/bash

Procfile

@@ -0,0 +1,4 @@
+web: python -m SimpleHTTPServer 8000
+replayed_web: python -m SimpleHTTPServer 8001
+listener: sudo -E go run ./bin/gor.go --input-raw :8000 --output-tcp :8002 --verbose
+replay: go run ./bin/gor.go --input-tcp :8002 --output-http localhost:8001 --verbose

README.md

@@ -1,94 +1,73 @@
-## About
-
-Gor is a simple http traffic replication tool written in Go. 
-Its main goal is to replay traffic from production servers to staging and dev environments.
-
-
-Now you can test your code on real user sessions in an automated and repeatable fashion.  
-**No more falling down in production!**
-
-Gor consists of 2 parts: listener and replay servers.
-
-The listener server catches http traffic from a given port in real-time
-and sends it to the replay server. 
-The replay server forwards traffic to a given address.
-
-
-![Diagram](http://i.imgur.com/9mqj2SK.png)
-
-
-## Basic example
-
-```bash
-# Run on servers where you want to catch traffic. You can run it on each `web` machine.
-sudo gor listen -p 80 -r replay.server.local:28020 
-
-# Replay server (replay.server.local). 
-gor replay -f http://staging.server
-```
-
-## Advanced use
-
-### Rate limiting
-The replay server supports rate limiting. It can be useful if you want
-forward only part of production traffic and not overload your staging
-environment. You can specify your desired requests per second using the
-"|" operator after the server address:
-
-```
-# staging.server will not get more than 10 requests per second
-gor replay -f "http://staging.server|10"
-```
-
-### Forward to multiple addresses
-
-You can forward traffic to multiple endpoints. Just separate the addresses by coma.
-```
-gor replay -f "http://staging.server|10,http://dev.server|5"
-```
-
-## Additional help
-```
-$ gor listen -h
-Usage of ./bin/gor-linux:
-  -i="any": By default it try to listen on all network interfaces.To get list of interfaces run `ifconfig`
-  -p=80: Specify the http server port whose traffic you want to capture
-  -r="localhost:28020": Address of replay server.
-```
-
-```
-$ gor replay -h
-Usage of ./bin/gor-linux:
-  -f="http://localhost:8080": http address to forward traffic.
-	You can limit requests per second by adding `|#{num}` after address.
-	If you have multiple addresses with different limits. For example: http://staging.example.com|100,http://dev.example.com|10
-  -ip="0.0.0.0": ip addresses to listen on
-  -p=28020: specify port number
-```
-
-## Pre-build binaries
-
-[Download binaries (linux 32/64, darwin)](https://drive.google.com/folderview?id=0B46uay48NwcfWFowc1E4a1BISVU&usp=sharing)
-
-## Building from source
-1. Setup standard Go environment http://golang.org/doc/code.html and ensure that $GOPATH environment variable properly set.
-2. `go get github.com/buger/gor`. 
-3. `cd $GOPATH/src/github.com/buger/gor`
-4. `go build gor.go` to get binary, or `go run gor.go` to build and run (useful for development)
-
-## FAQ
-
-### Why does the `gor listener` requires sudo or root access?
-Listener works by sniffing traffic from a given port. It's accessible
-only by using sudo or root access.
-
-### Do you support all http request types?
-Yes. ~~Right now it supports only "GET" requests.~~
-
-## TODO
-
-Use buffering for request throttling instead of simple rate limiting. 
-
-Better stats
-
-Optimize for load testing cases
+[![GitHub release](https://img.shields.io/github/release/buger/gor.svg?maxAge=3600)](https://github.com/buger/gor/releases) [![codebeat](https://codebeat.co/badges/6427d589-a78e-416c-a546-d299b4089893)](https://codebeat.co/projects/github-com-buger-gor) [![Go Report Card](https://goreportcard.com/badge/github.com/buger/gor)](https://goreportcard.com/report/github.com/buger/gor) [![Join the chat at https://gitter.im/buger/gor](https://badges.gitter.im/buger/gor.svg)](https://gitter.im/buger/gor?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+![Go Replay](http://i.imgur.com/ZG2ki5n.png)
+
+## https://goreplay.org/
+
+## About
+
+GoReplay is the simplest and safest way to test your app using real traffic before you put it into production.
+
+As your application grows, the effort required to test it also grows exponentially. GoReplay offers you the simple idea of reusing your existing traffic for testing, which makes it incredibly powerful. Our state of art technique allows to analyze and record your application traffic without affecting it. This eliminates the risks that come with putting a third party component in the critical path. 
+
+GoReplay increases your confidence in code deployments, configuration changes and infrastructure changes. Did we mention that no coding is required?
+
+
+
+Here is basic workflow: The listener server catches http traffic and sends it to the replay server or saves to file. The replay server forwards traffic to a given address.
+
+![Diagram](http://i.imgur.com/9mqj2SK.png)
+
+Check [latest documentation](http://github.com/buger/gor/wiki).
+
+## Installation
+Download latest binary from https://github.com/buger/gor/releases or [compile by yourself](https://github.com/buger/gor/wiki/Compilation).
+
+## Getting started
+
+The most basic setup will be `sudo ./gor --input-raw :8000 --output-stdout` which acts like tcpdump.
+If you already have test environment you can start replaying: `sudo ./gor --input-raw :8000 --output-http http://staging.env`.
+
+See the our [documentation](https://github.com/buger/gor/wiki/) and [Getting started](https://github.com/buger/gor/wiki/Getting-Started) page for more info. 
+## Newsletter
+Subscribe to our [newsletter](https://www.getdrip.com/forms/89690474/submissions/new) to stay informed about the latest features and changes to Gor project.
+
+
+## Want to Upgrade?
+
+We have created a [GoReplay PRO](https://goreplay.org/pro.html) extension which provides additional features such as support for binary protocols like Thrift or ProtocolBuffers, saving and replaying from cloud storage, TCP sessions replication, etc. The PRO version also includes a commercial-friendly license, dedicated support, and it also allows you to support high-quality open source development. 
+
+
+## Problems?
+If you have a problem, please review the [FAQ](https://github.com/buger/gor/wiki/FAQ) and [Troubleshooting](https://github.com/buger/gor/wiki/Troubleshooting) wiki pages. Searching the [issues](https://github.com/buger/gor/issues) for your problem is also a good idea.
+
+All bug-reports and suggestions should go though Github Issues or our [Google Group](https://groups.google.com/forum/#!forum/gor-users) (you can just send email to gor-users@googlegroups.com).
+If you have a private question feel free to send email to support@gortool.com.
+
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (git checkout -b my-new-feature)
+3. Commit your changes (git commit -am 'Added some feature')
+4. Push to the branch (git push origin my-new-feature)
+5. Create new Pull Request
+
+## Companies using Gor
+
+* [GOV.UK](https://www.gov.uk) - UK Government Digital Service
+* [theguardian.com](http://theguardian.com) - Most popular online newspaper in the UK
+* [TomTom](http://www.tomtom.com/) - Global leader in navigation, traffic and map products, GPS Sport Watches and fleet management solutions.
+* [3SCALE](http://www.3scale.net/) - API infrastructure to manage your APIs for internal or external users
+* [Optionlab](http://www.opinionlab.com) - Optimize customer experience and drive engagement across multiple channels
+* [TubeMogul](http://tubemogul.com) - Software for Brand Advertising
+* [Videology](http://www.videologygroup.com/) - Video advertising platform
+* [ForeksMobile](http://foreksmobile.com/) -  One of the leading financial application development company in Turkey
+* [Granify](http://granify.com) - AI backed SaaS solution that enables online retailers to maximise their sales
+* And many more!
+
+If you are using Gor we are happy add you to the list and share your story, just write to: hello@goreplay.org
+
+## Author
+
+Leonid Bugaev, [@buger](https://twitter.com/buger), https://leonsbox.com

byteutils/byteutils.go

@@ -0,0 +1,40 @@
+// Package byteutils probvides helpers for working with byte slices
+package byteutils
+
+// Cut elements from slice for a given range
+func Cut(a []byte, from, to int) []byte {
+	copy(a[from:], a[to:])
+	a = a[:len(a)-to+from]
+
+	return a
+}
+
+// Insert new slice at specified position
+func Insert(a []byte, i int, b []byte) []byte {
+	a = append(a, make([]byte, len(b))...)
+	copy(a[i+len(b):], a[i:])
+	copy(a[i:i+len(b)], b)
+
+	return a
+}
+
+// Replace function unlike bytes.Replace allows you to specify range
+func Replace(a []byte, from, to int, new []byte) []byte {
+	lenDiff := len(new) - (to - from)
+
+	if lenDiff > 0 {
+		// Extend if new segment bigger
+		a = append(a, make([]byte, lenDiff)...)
+		copy(a[to+lenDiff:], a[to:])
+		copy(a[from:from+len(new)], new)
+
+		return a
+	} else if lenDiff < 0 {
+		copy(a[from:], new)
+		copy(a[from+len(new):], a[to:])
+		return a[:len(a)+lenDiff]
+	} else { // same size
+		copy(a[from:], new)
+		return a
+	}
+}

byteutils/byteutils_test.go

@@ -0,0 +1,32 @@
+package byteutils
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestCut(t *testing.T) {
+	if !bytes.Equal(Cut([]byte("123456"), 2, 4), []byte("1256")) {
+		t.Error("Should properly cut")
+	}
+}
+
+func TestInsert(t *testing.T) {
+	if !bytes.Equal(Insert([]byte("123456"), 2, []byte("abcd")), []byte("12abcd3456")) {
+		t.Error("Should insert into middle of slice")
+	}
+}
+
+func TestReplace(t *testing.T) {
+	if !bytes.Equal(Replace([]byte("123456"), 2, 4, []byte("ab")), []byte("12ab56")) {
+		t.Error("Should replace when same length")
+	}
+
+	if !bytes.Equal(Replace([]byte("123456"), 2, 4, []byte("abcd")), []byte("12abcd56")) {
+		t.Error("Should replace when replacement length bigger")
+	}
+
+	if !bytes.Equal(Replace([]byte("123456"), 2, 5, []byte("ab")), []byte("12ab6")) {
+		t.Error("Should replace when replacement length bigger")
+	}
+}

circle.yml

@@ -0,0 +1,7 @@
+dependencies:
+  pre:
+    - sudo apt-get install libpcap-dev -y
+
+test:
+  override:
+    - sudo bash -l -c "export GOPATH='/home/ubuntu/.go_workspace:/usr/local/go_workspace:/home/ubuntu/.go_project' && GORACE='halt_on_error=1' /usr/local/go/bin/go test ./... -v -timeout 120s -race"

docs/Capturing-and-replaying-traffic.md

@@ -0,0 +1,49 @@
+Think about Gor more like a network analyzer or tcpdump on steroids, it is not a proxy and does not affect your app anyhow. You specify application port, and it will capture and replay incoming data.
+
+Simplest setup will be:
+```bash
+# Run on servers where you want to catch traffic. You can run it on every `web` machine.
+sudo gor --input-raw :80 --output-http http://staging.com
+```
+It will record and replay traffic from the same machine. However, it is possible to use [[Aggregator-forwarder setup]], when Gor on your web machines forward traffic to Gor aggregator instance running on the separate server.
+
+> You may notice that it require `sudo`: to analyze network Gor need permissions which available only to root users. However, it is possible to configure Gor [beign run for non-root users](Running as a non-root user).
+
+
+### Forwarding to multiple addresses
+
+You can forward traffic to multiple endpoints.
+```
+gor --input-tcp :28020 --output-http "http://staging.com"  --output-http "http://dev.com"
+```
+
+### Splitting traffic
+By default, it will send same traffic to all outputs, but you have options to equally split it (round-robin) using  `--split-output` option.
+
+```
+gor --input-raw :80 --output-http "http://staging.com"  --output-http "http://dev.com" --split-output true
+```
+
+### Tracking responses
+By default `input-raw` does not intercept responses, only requests. You can turn response tracking using `--input-raw-track-response` option. When enable you will be able to access response information in middleware and `output-file`.
+
+
+### Traffic interception engine
+By default, Gor will use `libpcap` for intercepting traffic, it should work in most cases. If you have any troubles with it, you may try alternative engine: `raw_socket`.
+
+```
+sudo gor --input-raw :80 --input-raw-engine "raw_socket" --output-http "http://staging.com"
+```
+
+You can read more about [[Replaying HTTP traffic]].
+
+
+### Tracking original IP addresses
+You can use `--input-raw-realip-header` option to specify header name: If not blank, injects header with given name and real IP value to the request payload. Usually, this header should be named: `X-Real-IP`, but you can specify any name.
+
+`gor --input-raw :80 --input-raw-realip-header "X-Real-IP" ...`
+
+
+***
+
+Also you may want to know about [[Rate limiting]], [[Request rewriting]] and [[Request filtering]]

docs/Commercial-FAQ.md

@@ -0,0 +1,58 @@
+### What are GoReplay PRO and GoReplay Enterprise?
+
+[GoReplay PRO](https://goreplay.org/pro.html) and GoReplay Enterprise are extensions to GoReplay which add more functionality and provide additional support options for customers.
+
+### Is there a trial version?
+
+There's no free trial but we do offer a 14 day period with full refund if it does not work for you.
+
+### What is the license?
+
+See [COMM-LICENSE](https://github.com/buger/gor/blob/master/COMM-LICENSE) in the root of the GoReplay repo.
+
+### How does PRO licensing work?
+
+Every organization running GoReplay Pro on its own servers must have a license.  There's no limit to the amount of servers or environments used by that organization.
+
+### How does Enterprise licensing work?
+
+Every organization running Gor Enterprise on its own servers must have a license. There's **no limit** to the amount of servers or environments used by that organization.
+
+### What happens if my subscription lapses?
+
+You must have an active subscription to run GoReplay Pro or Enterprise.  After a one week grace period, you'll lose access to binaries and priority support.  You won't get any more updates or bug fixes.
+
+### How do I buy GoReplay Enterprise?
+
+Send email to [support@gortool.com](mailto:support@gortool.com) with your info.  A PDF quote will be emailed to you with the price.  Reply to that email with your purchase order or just "Sounds good" and we will send an invoice which can be paid with a credit card, ACH bank transfer or a paper check.
+
+### Can I upgrade from GoReplay Pro?
+
+Yes!  Current subscribers can upgrade by [requesting a quote](mailto:support@gortool.com).  **Please note that you are an existing Pro subscriber.**  We will add a one-time discount on your first invoice to reflect any remaining Pro subscription credit.  If you purchased GoReplay Pro 6 months ago for $950, you'll get a $475 discount.
+
+### Can I distribute GoReplay PRO or Enterprise to my customers?
+
+This is a common requirement for "on-site installs" or "appliances" sold to large corporations.
+
+The standard license is appropriate for SaaS usage as it does not allow distribution.  GoReplay PRO and Enterprise have an Appliance license option which **does** allow you to distribute them.  The Appliance license is $9,500/yr for Pro and $19,500/yr for Enterprise.  It allows you to distribute the Pro or Enterprise binaries as part of your application and each of your customers to run GoReplay Pro or Enterprise. Email [support@gortool.com](mailto:support@gortool.com) to purchase.
+
+### Can you transfer a license?
+
+Licenses are **not** transferable to another company.  We will transfer the license from a user-specific email to a group email address (e.g. john_smith@example.com -> tech@example.com) but only for **the same domain**.  It is strongly recommended that you buy the license using a group email address so the license is not attached to any one employee's email address.
+
+### What does the license require me to do?
+
+Your purchase gets you a unique access URL for downloading the Pro and/or Enterprise binaries.  The license agreement requires you to keep this access URL private.  If we find your access URL is ever publicized:
+
+1. We'll send you a warning email with details.  You need to remove the content and send a new email address so we can generate a new access URL for you.  The old access URL will stop working immediately so you'll need to update your apps.
+2. If your access URL is publicized a second time, we reserve the right to permanently remove access.
+
+### Can I get a refund?
+
+Yes, up to two weeks after purchase.  Let us know the reason and maybe we can help but either way it's not a problem.  Email [support@gortool.com](mailto:support@gortool.com).
+
+### How do I update my credit card info?
+
+If you purchased GoReplay Enterprise, there's nothing to do.  Each annual invoice is paid separately.
+
+If you purchased GoReplay PRO, log into [Gumroad](https://gumroad.com) with your email address, click the Billing tab and enter your new card.  I can't provide support for the Gumroad website and don't have the ability to edit customer info - if you can't log in or change your credit card, you can always let your current subscription expire and purchase a new subscription.

docs/Commercial-Support.md

@@ -0,0 +1,11 @@
+Gor offers only community support.  Gor Pro and Enterprise offer priority support via email.
+
+## Priority Support
+
+Covers 1 incident per quarter, with a max response time of 2 working days. Scope is limited to Gor and Gor Pro and Enterprise features and APIs, not the application or infrastructure.  For support, email **support** AT **gortool.com**.  Please email using the same domain as the original license email or explain your connection to the licensed company.
+
+More aggressive support contracts (phone, quicker response time) are available separately, email with your needs.
+
+## Onboarding
+
+Enterprise customers may request a one hour video chat session with @buger to discuss their application(s), requirements and how best to leverage the various Gor features.  Contact support to set up your session.

docs/Commercial-collaboration.md

@@ -0,0 +1,19 @@
+Collaboration is difficult with commercial closed source but I do want to keep as much of the OSS ethos as possible available to customers who want to fix it themselves.
+
+## Legal
+
+In order to unambiguously own and sell Gor commercial products, I must have the copyright associated with the entire codebase.  Any code you create which is merged must be owned by me.  That's not me trying to be a jerk, that's just the way it works.
+
+## Application
+
+If you wish access to the product repository so you can send a PR, just open a new Gor issue and include the following info:
+
+1. the email address that bought the license, a max of one collaborator per license
+1. the following statement "I assign all rights, including copyright, to any future Gor work by myself to Leonid Bugaev"
+
+You should be granted access to the private repo soon after.
+
+## Notes
+
+1. You should **never** work on the master branch.  Only I may merge changes.
+1. I may revoke access for any reason at any time.  Access is not guaranteed with purchase.

docs/Compilation.md

@@ -0,0 +1,30 @@
+We provide pre-compiled binaries for Mac and Linux, but you are free to compile Gor by yourself.
+
+Gor is written using Go, so first you need to download it from here https://golang.org/, use the latest stable version. 
+
+The only Gor dependency is [libpcap](https://github.com/the-tcpdump-group/libpcap), which is the interface to various kernel packet capture mechanisms, and https://github.com/google/gopacket, which is a Go wrapper around libpcap. Latest libpcap version can be obtained at http://www.tcpdump.org/release/. Libpcap itself depend on `flex` and `bison` packages, many operating systems already have them installed.
+
+```bash
+# Fetch libpcap dependencies. Depending on your OS, instead of `apt` you will use `yum` or `rpm`, or `brew` on Mac.
+sudo apt-get install flex bison -y
+
+# Download latest stable release, compile and install it
+wget http://www.tcpdump.org/release/libpcap-1.7.4.tar.gz && tar xzf libpcap-1.7.4.tar.gz
+cd libpcap-1.7.4
+./configure && make install
+
+
+# Lets fetch Gor source code
+mkdir $HOME/gocode
+# See more information about GOPATH https://github.com/golang/go/wiki/GOPATH
+export GOPATH=$HOME/gocode
+# Fetch code from the Github
+go get github.com/buger/gor
+
+# Compile from source
+cd $HOME/gocode/src/github.com/buger/gor
+go build LDFLAGS = -ldflags "-extldflags \"-static\""
+```
+
+After you finished, you should see `gor` binary in current directory. 
+

docs/Development-Setup.md

@@ -0,0 +1,39 @@
+## STEP 1: Install Docker
+For local development we recommend to use Docker.
+
+If you don’t have it you can read how to install it here:
+https://docs.docker.com/engine/getstarted/step_one/#step-3-verify-your-installation
+
+## STEP 2: Download repository
+
+`git clone git@github.com:buger/goreplay.git`
+
+
+## STEP 3: Setup container
+
+```
+cd ./goreplay
+make build
+
+```
+
+## Testing
+To run tests execute next command:
+
+```
+make test
+```
+
+You can copy the command that is produced and modify it. For example, if you need to run one test copy the command and add `-run TestName`, e.g.:
+
+```
+docker run -v `pwd`:/go/src/github.com/buger/gor/ -p 0.0.0.0:8000:8000 -t -i gor:go go test ./. -run TestEmitterFiltered -timeout 60s -ldflags "-X main.VERSION=DEV-1482398347 -extldflags \"-static\""   -v
+```
+
+
+## Building
+To get a binary file run 
+
+```
+make release-bin
+```

docs/Distributed-configuration.md

@@ -0,0 +1,26 @@
+Sometimes it makes sense to use separate Gor instance for replaying traffic and performing things like load testing, so your production machines do not spend precious resources. It is possible to configure Gor on your web machines forward traffic to Gor aggregator instance running on the separate server.
+
+```bash
+# Run on servers where you want to catch traffic. You can run it on each `web` machine.
+sudo gor --input-raw :80 --output-tcp replay.local:28020
+
+# Replay server (replay.local).
+gor --input-tcp replay.local:28020 --output-http http://staging.com
+```
+
+If you have multiple replay machines you can split traffic among them using `--split-output` option: it will equally split all incoming traffic to all outputs using round robin algorithm.
+```
+gor --input-raw :80 --split-output --output-tcp replay1.local:28020 --output-tcp replay2.local:28020
+```
+
+[GoReplay PRO](https://goreplay.com/pro.html) support accurate recording and replaying of tcp sessions, and when `--recognize-tcp-sessions` option is passed, instead of round-robin it will use a smarter algorithm which ensures that same sessions will be sent to the same replay instance.
+
+
+In case if you are planning a large load testing, you may consider use separate master instance which will control Gor slaves which actually replay traffic. For example:
+```
+# This command will read multiple log files, replay them on 10x speed and loop them if needed for 30 seconds, and will distributed traffic (tcp session aware) among multiple workers
+gor --input-file logs_from_multiple_machines.*|1000% --input-file-loop --exit-after 30s --recognize-tcp-sessions --split-output --output-tcp worker1.local --output-tcp worker2.local:27017 --output-tcp worker3.local:27017 ...  --output-tcp workerN.local:27017
+
+# worker 
+gor --input-tcp :27017 --ouput-http load_test.target
+```

docs/Exporting-to-ElasticSearch.md

@@ -0,0 +1,38 @@
+Gor can export requests and replayed response data to ElasticSearch:
+
+```
+./gor --input-raw :8000 --output-http http://staging.com  --output-http-elasticsearch localhost:9200/gor
+```
+
+You don't have to create the index upfront. That will be done for you automatically.
+
+### Format
+
+Following structure represents ES format:
+
+```
+type ESRequestResponse struct {
+	ReqURL               string `json:"Req_URL"`
+	ReqMethod            string `json:"Req_Method"`
+	ReqUserAgent         string `json:"Req_User-Agent"`
+	ReqAcceptLanguage    string `json:"Req_Accept-Language,omitempty"`
+	ReqAccept            string `json:"Req_Accept,omitempty"`
+	ReqAcceptEncoding    string `json:"Req_Accept-Encoding,omitempty"`
+	ReqIfModifiedSince   string `json:"Req_If-Modified-Since,omitempty"`
+	ReqConnection        string `json:"Req_Connection,omitempty"`
+	ReqCookies           string `json:"Req_Cookies,omitempty"`
+	RespStatus           string `json:"Resp_Status"`
+	RespStatusCode       string `json:"Resp_Status-Code"`
+	RespProto            string `json:"Resp_Proto,omitempty"`
+	RespContentLength    string `json:"Resp_Content-Length,omitempty"`
+	RespContentType      string `json:"Resp_Content-Type,omitempty"`
+	RespTransferEncoding string `json:"Resp_Transfer-Encoding,omitempty"`
+	RespContentEncoding  string `json:"Resp_Content-Encoding,omitempty"`
+	RespExpires          string `json:"Resp_Expires,omitempty"`
+	RespCacheControl     string `json:"Resp_Cache-Control,omitempty"`
+	RespVary             string `json:"Resp_Vary,omitempty"`
+	RespSetCookie        string `json:"Resp_Set-Cookie,omitempty"`
+	Rtt                  int64  `json:"RTT"`
+	Timestamp            time.Time
+}
+```

docs/FAQ.md

@@ -0,0 +1,32 @@
+### What OS are supported?
+Gor will run everywhere where [libpcap](http://www.tcpdump.org/) works, and it works on most of the platforms. However, currently, we test it on Linux and Mac. See more about [[Compilation]].
+
+### Why does the `--input-raw` requires sudo or root access?
+Listener works by sniffing traffic from a given port. It's accessible
+only by using sudo or root access. But it is possible to [[Running as non root user]].
+
+### How do you deal with user session to replay the traffic correctly?
+You can rewrite session related headers/params to match your staging environment. If you require custom logic (e.g random token based auth) follow this discussion: https://github.com/buger/gor/issues/154
+
+### Can I use Gor to intercept SSL traffic?
+Basic idea is that SSL was made to protect itself from traffic interception. There 2 options: 
+1. Move SSL handling to proxy like Nginx or Amazon ELB. And allow Gor to listen on upstreams. 
+2. Use `--input-http` so you can duplicate request payload directly from your app to Gor, but it will require your app modifications.
+
+More can be find here: https://github.com/buger/gor/issues/85
+
+### Is there a limit for size of HTTP request when using output-http?
+Due to the fact that Gor can't guarantee interception of all packets, for large payloads > 200kb there is chance of missing some packets and corrupting body. Treat it as a feature and chance to test broken bodies handling :)
+The only way to guarantee delivery is using `--input-http`, but you will miss some features.
+
+### I'm getting 'too many open files' error
+Typical Linux shell has a small open files soft limit at 1024. You can easily raise that when you do this before starting your gor replay process:
+  
+  ulimit -n 64000
+
+More about ulimit: http://www.thecodingmachine.com/solving-the-too-many-open-files-exception-in-red5-or-any-other-application/
+
+### The CPU average across my load-balanced targets is higher than the source
+If you are replaying traffic from multiple listeners to a load-balanced target and you use sticky sessions, you may observe that the target servers have a higher CPU load than the listener servers. This may be because the sticky session cookie of the original load balancer is not honored by the target load balancer thus resulting in requests that would normally hit the same target server hitting different servers on the backend thus reducing some caching benefits gained via the load balancing.  Try running just one listener against one replay target and see if the CPU utilization comparison is more accurate.
+
+Also see [[Troubleshooting]].

docs/Getting-Started.md

@@ -0,0 +1,44 @@
+### Dependencies
+To start working with Gor, you need to have a web server running on your machine, and a terminal to run commands. If you are just poking around, you can quickly start the server by calling `gor file-server :8000`, this will start a simple file server of the current directory on port `8000`. 
+
+### Installing Gor
+Download the latest Gor binary from https://github.com/buger/gor/releases (we provide precompiled binaries for Windows, Linux x64 and Mac OS), or you can compile by yourself [[Compilation]].
+
+Once the archive is downloaded and uncompressed, you can run Gor from the current directory, or you may want to copy binary to your PATH (for Linux and Mac OS it can be `/usr/local/bin`).
+
+### Capturing web traffic
+Now run this command in terminal: `sudo ./gor --input-raw :8000 --output-stdout`
+
+This command says to listen for all network activity happening on port 8000 and log it to stdout.
+If you are familiar with `tcpdump`, we are going to implement similar functionality. 
+
+> You may notice that it uses `sudo` and asks for the password: to analyze network, Gor needs permissions which are available only to super users.
+> However, it is possible to configure Gor [being run for non-root users](Running-as-non-root-user).
+
+
+Make a few requests by opening `http://localhost:8000` in your browser, or just by calling curl in terminal `curl http://localhost:8000`. You should see that `gor` outputs all the HTTP requests and responses right to the terminal window where it is running. 
+
+
+**Gor is not a proxy:** you do not need to put 3-rd party tool to your critical path. Instead Gor just silently analyzes the traffic of your application and does not affect it anyhow.
+
+### Replaying
+
+Now it's time to replay your original traffic to another environment. Let's start the same file web server but on a different port: `gor file-server :8001`. 
+
+Instead of `--output-stdout` we will use `--output-http` and provide URL of second server: `sudo ./gor --input-raw :8000 --output-http="http://localhost:8001"`
+
+Make few requests to first server. You should see them replicated to the second one, voila! 
+
+### Saving requests to file and replaying them later
+Sometimes it's not possible to replay requests in real time; Gor allows you to save requests to the file and replay them later. 
+
+First use `--output-file` to save them: `sudo ./gor --input-raw :8000 --output-file=requests.gor`. This will create new file and continuously write all captured requests to it. 
+
+Let's re-run Gor, but now to replay requests from file: `./gor --input-file requests.gor --output-http="http://localhost:8001"`. You should see all the recorded requests coming to the second server, and they will be replayed in the same order and with exactly same timing as they were recorded.
+
+Next: [[The Basics]]
+
+### Watch an overview:
+
+
+[![Foo](http://img.youtube.com/vi/CxuKZcMKaW4/0.jpg)](https://www.youtube.com/watch?v=CxuKZcMKaW4)

docs/Home.md

@@ -0,0 +1,29 @@
+Gor is an open-source tool for capturing and replaying live HTTP traffic into a test environment in order to continuously test your system with real data. It can be used to increase confidence in code deployments, configuration changes and infrastructure changes.
+
+Read for more info:
+
+* [[Getting Started]]
+* [[The Basics]]
+* [[Capturing and replaying traffic]]
+* [[Replaying HTTP traffic]]
+* [[[PRO] Replaying Binary protocols]]
+* [[[PRO] Recording and replaying keep alive TCP sessions]]
+* [[Saving and Replaying from file]]
+* [Performance testing](https://github.com/buger/gor/wiki/Saving-and-Replaying-from-file#performance-testing)
+* [[Rate limiting]]
+* [[Request filtering]]
+* [[Request rewriting]]
+* [[Middleware]]
+* [[Distributed configuration]]
+* [[Exporting to ElasticSearch]]
+* [[FAQ]]
+* [[Troubleshooting]]
+
+## Commercial Aspects
+
+* [[Commercial Support]]
+* [[Commercial FAQ]]
+* [[Commercial collaboration]]
+
+
+Next: [Getting Started](Getting-Started)

docs/Middleware.md

@@ -0,0 +1,74 @@
+#### Overview
+Middleware is a program that accepts request and response payload at STDIN and emits modified requests at STDOUT. You can implement any custom logic like stripping private data, advanced rewriting, support for oAuth and etc. Check examples [included into our repo](https://github.com/buger/gor/tree/master/examples/middleware).
+
+
+```
+                   Original request      +--------------+
++-------------+----------STDIN---------->+              |
+|  Gor input  |                          |  Middleware  |
++-------------+----------STDIN---------->+              |
+                   Original response (1) +------+---+---+
+                                                |   ^
++-------------+    Modified request             v   |
+| Gor output  +<---------STDOUT-----------------+   |
++-----+-------+                                     |
+      |                                             |
+      |            Replayed response                |
+      +------------------STDIN----------------->----+
+```
+
+(1): Original responses will only be sent to the middleware if the `--input-raw-track-response` option is specified.
+
+Middleware can be written in any language, see `examples/middleware` folder for examples.
+Middleware program should accept the fact that all communication with Gor is asynchronous, there is no guarantee that original request and response messages will come one after each other. Your app should take care of the state if logic depends on original or replayed response, see `examples/middleware/token_modifier.go` as example.
+
+Simple bash echo middleware (returns same request) will look like this:
+```bash
+while read line; do
+  echo $line
+end
+```
+
+Middleware can be enabled using `--middleware` option, by specifying path to executable file:
+```
+gor --input-raw :80 --middleware "/opt/middleware_executable" --output-http "http://staging.server"
+```
+
+#### Communication protocol
+All messages should be hex encoded, new line character specifieds the end of the message, eg. new message per line.
+
+Decoded payload consist of 2 parts: header and HTTP payload, separated by new line character.  
+
+Example request payload:
+
+```
+1 932079936fa4306fc308d67588178d17d823647c 1439818823587396305
+GET /a HTTP/1.1
+Host: 127.0.0.1
+
+```
+
+Example response payload (note: you will only receive this if you specify `--input-raw-track-response`)
+
+```
+2 8e091765ae902fef8a2b7d9dd960e9d52222bd8c 1439818823587996305 2782013
+HTTP/1.1 200 OK
+Date: Mon, 17 Aug 2015 13:40:23 GMT
+Content-Length: 0
+Content-Type: text/plain; charset=utf-8
+
+```
+
+Header contains request meta information separated by spaces. First value is payload type, possible values: `1` - request, `2` - original response, `3` - replayed response.
+Next goes request id: unique among all requests (sha1 of time and Ack), but remain same for original and replayed response, so you can create associations between request and responses. The third argument is the time when request/response was initiated/received. Forth argument is populated only for responses and means latency.
+
+HTTP payload is unmodified HTTP requests/responses intercepted from network. You can read more about request format [here](http://www.jmarshall.com/easy/http/), [here](https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol) and [here](http://www.w3.org/Protocols/rfc2616/rfc2616.html). You can operate with payload as you want, add headers, change path, and etc. Basically you just editing a string, just ensure that it is RCF compliant.
+
+At the end modified (or untouched) request should be emitted back to STDOUT, keeping original header, and hex-encoded. If you want to filter request, just not send it. Emitting responses back is required, even if you did not touch them.
+
+#### Advanced example
+Imagine that you have auth system that randomly generate access tokens, which used later for accessing secure content. Since there is no pre-defined token value, naive approach without middleware (or if middleware use only request payloads) will fail, because replayed server have own tokens, not synced with origin. To fix this, our middleware should take in account responses of replayed and origin server, store `originalToken -> replayedToken` aliases and rewrite all requests using this token to use replayed alias. See [examples/middleware/token_modifier.go](https://github.com/buger/gor/tree/master/examples/middleware/token_modifier.go) and [middleware_test.go#TestTokenMiddleware](https://github.com/buger/gor/tree/master/middleware_test.go) as example of described scheme.
+
+***
+
+You may also read about [[Request filtering]], [[Rate limiting]] and [[Request rewriting]].

docs/Rate-limiting.md

@@ -0,0 +1,37 @@
+Rate limiting can be useful if you only want to forward parts of incoming traffic, for example, to not overload your test environment. There are two strategies: dropping random requests or dropping fractions of requests based on Header or URL param value. 
+
+### Dropping random requests
+Every input and output support random rate limiting.
+There are two limiting algorithms: absolute or percentage based. 
+
+**Absolute**: If for current second it reached specified requests limit - disregard the rest, on next second counter reset.
+
+**Percentage**: For input-file it will slowdown or speedup request execution, for the rest it will use the random generator to decide if request pass or not based on the chance you specified. 
+
+You can specify your desired limit using the "|" operator after the server address, see examples below.
+
+#### Limiting replay using absolute number
+```
+# staging.server will not get more than ten requests per second
+gor --input-tcp :28020 --output-http "http://staging.com|10"
+```
+
+#### Limiting listener using percentage based limiter
+```
+# replay server will not get more than 10% of requests 
+# useful for high-load environments
+gor --input-raw :80 --output-tcp "replay.local:28020|10%"
+```
+
+### Consistent limiting based on Header or URL param value
+If you have unique user id (like API key) stored in header or URL you can consistently forward specified percent of traffic only for the fraction of this users. 
+Basic formula looks like this: `FNV32-1A_hashing(value) % 100 >= chance`. Examples:
+```
+# Limit based on header value
+gor --input-raw :80 --output-tcp "replay.local:28020|10%" --http-header-limiter "X-API-KEY: 10%"
+
+# Limit based on header value
+gor --input-raw :80 --output-tcp "replay.local:28020|10%" --http-param-limiter "api_key: 10%"
+```
+
+When limiting based on header or param only percentage based limiting supported.

docs/Replaying-HTTP-traffic.md

@@ -0,0 +1,46 @@
+Gor can replay HTTP traffic using `--output-http` option:
+
+```bash
+sudo ./gor --input-raw :8000 --output-http="http://staging.env"
+```
+
+You can [filter](Request filtering), [rate limit](Rate limiting) and [rewrite](Request rewriting) requests on the fly. 
+
+### HTTP output workers
+By default Gor creates a dynamic pool of workers: it starts with 10 and creates more HTTP output workers when the HTTP output queue length is greater than 10.  The number of workers created (N) is equal to the queue length at the time which it is checked and found to have a length greater than 10. The queue length is checked every time a message is written to the HTTP output queue.  No more workers will be spawned until that request to spawn N workers is satisfied.  If a dynamic worker cannot process a message at that time, it will sleep for 100 milliseconds. If a dynamic worker cannot process a message for 2 seconds it dies.
+You may specify fixed number of workers using  `--output-http-workers=20` option.
+
+### Following redirects
+By default Gor will ignore all redirects since they are handled by clients using your app, but in scenarios where your replayed environment introduces new redirects, you can enable them like this: 
+```
+gor --input-tcp replay.local:28020 --output-http http://staging.com --output-http-redirects 2
+```
+The given example will follow up to 2 redirects per request.
+
+### HTTP timeouts
+By default http timeout for both request and response is 5 seconds. You can override it like this:
+```
+gor --input-tcp replay.local:28020 --output-http http://staging.com --output-http-timeout 30s
+```
+
+### Response buffer
+By default, to reduce memory consumption, internal HTTP client will fetch max 200kb of the response body (used if you use middleware), by you can increase limit using `--output-http-response-buffer` option (accepts number of bytes).
+
+### Basic Auth
+
+If your development or staging environment is protected by Basic Authentication then those credentials can be injected in during the replay:
+
+```
+gor --input-raw :80 --output-http "http://user:pass@staging.com"
+```
+
+Note: This will overwrite any Authorization headers in the original request.
+
+
+### Multiple domains support
+
+If you app accepts traffic from multiple domains, and you want to keep original headers, there is specific `--http-original-host` with tells Gor do not touch Host header at all.
+
+
+***
+You may also read about [[Saving and Replaying from file]]

docs/Request-filtering.md

@@ -0,0 +1,35 @@
+Filtering is useful when you need to capture only specific part of traffic, like API requests. It is possible to filter by URL, HTTP header or HTTP method.
+
+#### Allow url regexp
+```
+# only forward requests being sent to the /api endpoint
+gor --input-raw :8080 --output-http staging.com --http-allow-url /api
+```
+
+#### Disallow url regexp
+```
+# only forward requests NOT being sent to the /api... endpoint
+gor --input-raw :8080 --output-http staging.com --http-disallow-url /api
+```
+#### Filter based on regexp of header
+
+```
+# only forward requests with an api version of 1.0x
+gor --input-raw :8080 --output-http staging.com --http-allow-header api-version:^1\.0\d
+
+# only forward requests NOT containing User-Agent header value "Replayed by Gor"
+gor --input-raw :8080 --output-http staging.com --http-disallow-header "User-Agent: Replayed by Gor"
+```
+
+#### Filter based on HTTP method
+Requests not matching a specified whitelist can be filtered out. For example to strip non-nullipotent requests:
+
+```
+gor --input-raw :80 --output-http "http://staging.server" \
+    --http-allow-method GET \
+    --http-allow-method OPTIONS
+```
+
+
+-----
+You may also read about [[Request rewriting]], [[Rate limiting]] and [[Middleware]]

docs/Request-rewriting.md

@@ -0,0 +1,38 @@
+Gor supports rewriting of URLs, URL params and headers, see below.
+
+Rewriting may be useful if you test environment does not have the same data as your production, and you want to perform all actions in the context of `test` user: for example rewrite all API tokens to some test value. Other possible use cases are toggling features on/off using custom headers or rewriting URL's if they changed in the new environment.
+
+For more complex logic you can use [[Middleware]].
+
+#### Rewrite URL based on a mapping
+`--http-rewrite-url` expects value in "<search>:<replace>" format: ":" is a dilimiter. In `<replace>` section you may use captured regexp group values. This works similar to `replace` method in Javascript or `gsub` in Ruby. 
+
+```
+# Rewrites all `/v1/user/<user_id>/ping` requests to `/v2/user/<user_id>/ping`
+gor --input-raw :8080 --output-http staging.com --http-rewrite-url /v1/user/([^\\/]+)/ping:/v2/user/$1/ping
+```
+
+#### Set URL param
+Set request url param, if param already exists it will be overwritten.
+```
+gor --input-raw :8080 --output-http staging.com --http-set-param api_key=1
+```
+
+#### Set Header
+Set request header, if header already exists it will be overwritten. May be useful if you need to identify requests generated by Gor or enable feature flagged functionality in an application:
+
+```
+gor --input-raw :80 --output-http "http://staging.server" \
+    --http-header "User-Agent: Replayed by Gor" \
+    --http-header "Enable-Feature-X: true"
+```
+
+#### Host header
+Host header gets special treatment. By default Host get set to the value specified in --output-http. If you manually set --http-header "Host: anonther.com", Gor will not override Host value.
+
+If you app accepts traffic from multiple domains, and you want to keep original headers, there is specific `--http-original-host` with tells Gor do not touch Host header at all.
+
+
+***
+
+You may also read about [[Request filtering]], [[Rate limiting]] and [[Middleware]]

docs/Running-as-non-root-user.md

@@ -0,0 +1,17 @@
+You can enable Gor for non-root users in a secure method by using the following commands
+
+``` 
+# Following commands assume that you put `gor` binary to /usr/local/bin
+add gor
+addgroup <username> gor
+chgrp gor /usr/local/bin/gor
+chmod 0750 /usr/local/bin/gor
+setcap "cap_net_raw,cap_net_admin+eip" /usr/local/bin/gor
+```
+ 
+As a brief explanation of the above.
+* We create a group called gor. 
+* We then add the user you want to the new group so they will be able to use gor without sudo
+* We then change the user/group of gor binary the new group.
+* We then make sure the permissions are set on gor binary so that members of the group can execute it but other normal users cannot.
+* We then use `setcap` to give the CAP_NET_RAW and CAP_NET_ADMIN privilege to the executable when it runs. This is so that Gor can open its raw socket which is not normally permitted unless you are root.

docs/Saving-and-Replaying-from-file.md

@@ -0,0 +1,105 @@
+You can save requests to file, and replay them later. While replaying it will preserve the original time differences between requests. If you apply [percentage based limiting](Rate Limiting) timing between requests will be reduced or increased appropriately: this approach opens possibilities like load testing, see below.
+
+```bash
+# write to file
+gor --input-raw :80 --output-file requests.log
+
+# read from file
+gor --input-file requests.gor --output-http "http://staging.com"
+```
+
+By default Gor writes files in chunks. This configurable using `--output-file-append` option: the flushed chunk is appended to existence file or not. The default is **false**. By default, `--output-file` flushes each chunk to a different path.
+
+```bash
+gor ... --output-file %Y%m%d.log
+# append false
+20140608_0.log
+20140608_1.log
+20140609_0.log
+20140609_1.log
+```
+
+This makes parallel file processing easy. But if you want to disable this behavior, you can disable it by adding `--output-file-append` option:
+
+```bash
+gor ... --output-file %Y%m%d.log --output-file-append
+# append true
+20140608.log
+20140609.log
+```
+
+If you run gor multiple times, and it finds existing files, it will continue from last known index.
+
+### Chunk size
+
+You can set chunk limits using `--output-file-size-limit` and `--output-file-queue-limit` options.
+The length of the chunk queue and the size of each chunk, respectively. The default values are 256 and 32mb, respectively. The suffixes “k” (KB), “m” (MB), and “g” (GB) can be used for `output-file-size-limit`.
+If you want to have only size constraint, you can set `--output-file-queue-limit` to 0, and vice versa.
+
+```bash
+gor --input-raw :80 --output-file %Y-%m-%d.gz --output-file-size-limit 256m --output-file-queue-limit 0
+```
+
+### Using date variables in file names
+For example, you can tell to create new file each hour: `--output-file /mnt/logs/requests-%Y-%m-%d-%H.log`
+It will create new file for each hour: requests-2016-06-01-12.log, requests-2016-06-01-13.log, ...
+
+The time format used as part of the file name. The following characters are replaced with actual values when the file is created:
+
+* `%Y`: year including the century (at least 4 digits)
+* `%m`: month of the year (01..12)
+* `%d`: Day of the month (01..31)
+* `%H`: Hour of the day, 24-hour clock (00..23)
+* `%M`: Minute of the hour (00..59)
+* `%S`: Second of the minute (00..60)
+
+The default format is `%Y%m%d%H`, which creates one file per hour.
+
+
+### GZIP compression
+To read or write GZIP compressed files ensure that file extension ends with ".gz": `--output-file log.gz`
+
+### Replaying from multiple files
+
+`--input-file` accepts file pattern, for example: `--input-file logs-2016-05-*`: it will replay all the files, sorting them in lexicographical order.
+
+### Buffered file output
+Gor has memory buffer when it writes to file, and continuously flush changes to the file. Flushing to file happens if the buffer is filled, forced flush every 1 second, or if Gor is closed. You can change it using `--output-file-flush-interval` option. It most cases it should not be touched.
+
+### File format
+HTTP requests stored as it is, plain text: headers and bodies. Requests separated by `\n🐵🙈🙉\n` line (using such sequence for uniqueness and fun). Before each request goes single line with meta information containing payload type (1 - request, 2 - response, 3 - replayed response), unique request ID (request and response have the same) and timestamp when request was made. An example of 2 requests:
+
+```
+1 d7123dasd913jfd21312dasdhas31 127345969\n
+GET / HTTP/1.1\r\n
+\r\n
+\n
+🐵🙈🙉
+\n
+POST /upload HTTP/1.1\r\n
+Content-Length: 7\r\n
+Host: www.w3.org\r\n
+\r\n
+a=1&b=2
+```
+Note that technically \r and \n symbols are invisible, and indicate new lines. I made them visible in example just to show how it looks on byte level.
+
+Making it text friendly allows writing simple parsers and use console tools like `grep` to do an analysis. You can even edit them manually, but be sure that your file editor does not change line endings.
+
+## Performance testing
+
+Currently, this functionality supported only by `input-file` and only when using percentage based limiter. Unlike default limiter for `input-file` instead of dropping requests it will slowdown or speedup request emitting. Note that **limiter is applied to input**:
+
+```
+# Replay from file on 2x speed 
+gor --input-file "requests.gor|200%" --output-http "staging.com"
+```
+
+Use `--stats --output-http-stats` to see latency stats.
+
+### Looping files for replaying indefinitely
+You can loop the same set of files, so when the last one replays all the requests, it will not stop, and will start from first one again. Having the only small amount of requests you can do extensive performance testing.
+Pass `--input-file-loop` to make it work. 
+
+***
+You may also read about [[Capturing and replaying traffic]] and [[Rate limiting]]

docs/The-Basics.md

@@ -0,0 +1,17 @@
+### Overview
+Gor architecture tries to follow UNIX philosophy: everything made of pipes, various inputs multiplexing data to outputs.
+
+You can [rate limit](Rate limiting), [filter](Request filtering), [rewrite](Request rewriting) requests or even use your own [middleware](Middleware) to implement custom logic. Also, it is possible to replay requests at the higher rate for [load testing](Saving and Replaying from file).
+
+### Available input and output plugins
+
+Available inputs:
+   * `--input-raw` - used to capture HTTP traffic, you should specify IP address or interface and application port. More about [[Capturing and replaying traffic]].
+   * `--input-file` - accepts file which previously was recorded using `--output-file`. More about [[Saving and Replaying from file]]
+   * `--input-tcp` - used by Gor aggregation instance if you decided forward traffic from multiple forwarder Gor instances to it. Read about using [[Aggregator-forwarder setup]].
+
+Available outputs:
+   * `--output-http` - replay HTTP traffic to given endpoint, accepts base url. Read [more about it](Replaying HTTP traffic)
+   * `--output-file` - records incoming traffic to the file. More about [[Saving and Replaying from file]]
+   * `--output-tcp` - forward incoming data to another Gor instance, used in conjunction with `--input-tcp`. Read more about [[Aggregator-forwarder setup]].
+   * `--output-stdout` - used for debugging, outputs all data to stdout.

docs/Troubleshooting.md

@@ -0,0 +1,90 @@
+Gor can report stats on the `output-tcp` and `output-http` request queues. Stats are reported to the console every 5 seconds in the form `latest,mean,max,count,count/second` by using the `--output-http-stats` and `--output-tcp-stats` options.
+
+Examples:
+
+```
+2014/04/23 21:17:50 output_tcp:latest,mean,max,count,count/second
+2014/04/23 21:17:50 output_tcp:0,0,0,0,0
+2014/04/23 21:17:55 output_tcp:1,1,2,68,13
+2014/04/23 21:18:00 output_tcp:1,1,2,92,18
+2014/04/23 21:18:05 output_tcp:1,1,2,119,23
+```
+
+```
+2014/04/23 21:19:46 output_http:latest,mean,max,count,count/second
+2014/04/23 21:19:46 output_http:0,0,0,0,0
+2014/04/23 21:19:51 output_http:0,0,0,0,0
+2014/04/23 21:19:56 output_http:0,0,0,0,0
+2014/04/23 21:20:01 output_http:1,0,1,50,10
+2014/04/23 21:20:06 output_http:1,1,4,72,14
+2014/04/23 21:20:11 output_http:1,0,1,179,35
+2014/04/23 21:20:16 output_http:1,0,1,148,29
+2014/04/23 21:20:21 output_http:1,1,2,91,18
+2014/04/23 21:20:26 output_http:1,1,2,150,30
+2014/04/23 21:18:15 output_http:100,99,100,70,14
+2014/04/23 21:18:21 output_http:100,99,100,55,11
+```
+
+### How can I tell if I have bottlenecks?
+Key areas that sometimes experience bottlenecks are the output-tcp and output-http functions which have internal queues for requests. Each queue has an upper limit of 100. Enable stats reporting to see if any queues are experiencing bottleneck behavior.
+ 
+#### Output HTTP bottlenecks
+When running a Gor replay the output-http feature may bottleneck if:
+
+  * the replay has inadequate bandwidth. If the replay is receiving or sending more messages than its network adapter can handle the output-http-stats  may report that the output-http queue is filling up. See if there is a way to upgrade the replay's bandwidth.
+  * with `--output-http-workers` set to anything other than `-1` the `-output-http` target is unable to respond to messages in a timely manner. The http output workers which take messages off the output-http queue, process the request, and ensure that the request did not result in an error may not be able to keep up with the number of incoming requests. If the replay is not using dynamic worker scaling (`--output-http-workers=-1`)  The optimal number of output-http-workers can be determined with the formula `output-workers = (Average number of requests per second)/(Average target response time per second)`.
+
+#### Output TCP bottlenecks
+When using the Gor listener the output-tcp feature may bottleneck if:
+
+  * the replay is unable to accept and process more requests than the listener is able generate. Prior to troubleshooting the output-tcp bottleneck, ensure that the replay target is not experiencing any bottlenecks. 
+  * the replay target has inadequate bandwidth to handle all its incoming requests.  If a replay target's incoming bandwidth is maxed out the output-tcp-stats may report that the output-tcp queue is filling up. See if there is a way to upgrade the replay's bandwidth.
+
+
+#### Tuning
+
+To achieve the top most performance you should tune the source server system limits:
+
+    net.ipv4.tcp_max_tw_buckets = 65536
+    net.ipv4.tcp_tw_recycle = 1
+    net.ipv4.tcp_tw_reuse = 0
+    net.ipv4.tcp_max_syn_backlog = 131072
+    net.ipv4.tcp_syn_retries = 3
+    net.ipv4.tcp_synack_retries = 3
+    net.ipv4.tcp_retries1 = 3
+    net.ipv4.tcp_retries2 = 8
+    net.ipv4.tcp_rmem = 16384 174760 349520
+    net.ipv4.tcp_wmem = 16384 131072 262144
+    net.ipv4.tcp_mem = 262144 524288 1048576
+    net.ipv4.tcp_max_orphans = 65536
+    net.ipv4.tcp_fin_timeout = 10
+    net.ipv4.tcp_low_latency = 1
+    net.ipv4.tcp_syncookies = 0
+***
+
+### Gor is crashing with following stacktrace
+```
+fatal error: unexpected signal during runtime execution
+[signal 0xb code=0x1 addr=0x63 pc=0x7ffcdfdf8b2c]
+
+runtime stack:
+runtime.throw(0xad8380, 0x2a)
+	/usr/local/go/src/runtime/panic.go:547 +0x90
+runtime.sigpanic()
+	/usr/local/go/src/runtime/sigpanic_unix.go:12 +0x5a
+
+goroutine 103 [syscall, locked to thread]:
+runtime.cgocall(0x7b35a0, 0xc82121f1e8, 0x0)
+	/usr/local/go/src/runtime/cgocall.go:123 +0x11b fp=0xc82121f188 sp=0xc82121f158
+net._C2func_getaddrinfo(0x7ffcec0008c0, 0x0, 0xc821b221e0, 0xc8217b2b18, 0x0, 0x0, 0x0)
+	??:0 +0x55 fp=0xc82121f1e8 sp=0xc82121f188
+net.cgoLookupIPCNAME(0x7fffb17208ab, 0x12, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xb17200)
+```
+
+There is a chance that you hit Go bug. The crash comes from the CGO version of DNS resolver.
+By default Go based version used, but ins some cases [it switches to CGO based](https://golang.org/pkg/net/#hdr-Name_Resolution). It is possible to force Go based DNS resolver using GODEBUG environment variable:
+`sudo GODEBUG="netdns=go" ./gor --input-raw :80 --output-http staging.env`
+
+
+
+Also, see [[FAQ]]

docs/[PRO]-Recording-and-replaying-keep-alive-TCP-sessions.md

@@ -0,0 +1,11 @@
+> **This feature available only in PRO version. See https://goreplay.org/pro.html for details.**
+
+By default, GoReplay does not guarantee that when you record keep-alive TCP session, it will be replayed in the same TCP connection as well. This is ok for most of the cases, but it does not give an accurate number of TCP sessions while replaying, also may cause issues if your application state depends on TCP session (do not mess with HTTP session).
+
+[GoReplay PRO](https://goreplay.org/pro.html) extension adds support for accurate recording and replaying of keep-alive TCP sessions. Separate connection to your server is created per original session and it makes benchmarks and tests incredibly accurate. To enable session recognition you just need to pass `--recognize-tcp-sessions` option. 
+
+```
+gor --input-raw :80 --recognize-tcp-sessions --output-http http://test.target
+```
+
+Note that enabling this option also change algorithm of distributing traffic when using `--split-output`, see [Distributed configuration].

docs/[PRO]-Replaying-Binary-protocols.md

@@ -0,0 +1,14 @@
+> **This feature available only in PRO version. See https://goreplay.org/pro.html for details.**
+
+Gor includes basic support for working with binary formats like `thrift` or `protocol-buffers`. To start set `--input-raw-protocol` to 'binary' (by default 'http'). For replaying, you should use `--output-binary`, example:
+
+```
+gor --input-raw :80 --input-raw-protocol binary --output-binary staging:8081
+```
+
+While working with `--input-raw` you may notice a 2-second delay before messages are emitted to the outputs. This behaviour is expected and happening because for general binary protocol it is impossible to know when TCP message ends, so Gor has to set inactivity timeout. Each protocol has own rules (for example write message length as first bytes), and require individual handling to know message length. We consider improving detailed protocol support for `thrift`, `protocol-buffer` and etc.
+
+Note that you can use all load testing features for binary protocols. For example, the following command will loop and replay recorded payload on 10x speed for 30 seconds:
+```
+gor --input-file './binary*.gor|1000%' --output-binary staging:9091 --input-file-loop --exit-after 30s
+```

docs/_Footer.md

@@ -0,0 +1 @@
+[Website](https://goreplay.org) | [PRO version](https://goreplay.org/pro.html) | [[Getting started]] | [[FAQ]] | [Join newsletter](https://www.getdrip.com/forms/89690474/submissions/new)

elasticsearch.go

@@ -0,0 +1,156 @@
+package main
+
+import (
+	"encoding/json"
+	"github.com/buger/gor/proto"
+	"github.com/mattbaird/elastigo/lib"
+	"log"
+	"regexp"
+	"time"
+)
+
+type ESUriErorr struct{}
+
+func (e *ESUriErorr) Error() string {
+	return "Wrong ElasticSearch URL format. Expected to be: host:port/index_name"
+}
+
+type ESPlugin struct {
+	Active  bool
+	ApiPort string
+	eConn   *elastigo.Conn
+	Host    string
+	Index   string
+	indexor *elastigo.BulkIndexer
+	done    chan bool
+}
+
+type ESRequestResponse struct {
+	ReqURL               string `json:"Req_URL"`
+	ReqMethod            string `json:"Req_Method"`
+	ReqUserAgent         string `json:"Req_User-Agent"`
+	ReqAcceptLanguage    string `json:"Req_Accept-Language,omitempty"`
+	ReqAccept            string `json:"Req_Accept,omitempty"`
+	ReqAcceptEncoding    string `json:"Req_Accept-Encoding,omitempty"`
+	ReqIfModifiedSince   string `json:"Req_If-Modified-Since,omitempty"`
+	ReqConnection        string `json:"Req_Connection,omitempty"`
+	ReqCookies           string `json:"Req_Cookies,omitempty"`
+	RespStatus           string `json:"Resp_Status"`
+	RespStatusCode       string `json:"Resp_Status-Code"`
+	RespProto            string `json:"Resp_Proto,omitempty"`
+	RespContentLength    string `json:"Resp_Content-Length,omitempty"`
+	RespContentType      string `json:"Resp_Content-Type,omitempty"`
+	RespTransferEncoding string `json:"Resp_Transfer-Encoding,omitempty"`
+	RespContentEncoding  string `json:"Resp_Content-Encoding,omitempty"`
+	RespExpires          string `json:"Resp_Expires,omitempty"`
+	RespCacheControl     string `json:"Resp_Cache-Control,omitempty"`
+	RespVary             string `json:"Resp_Vary,omitempty"`
+	RespSetCookie        string `json:"Resp_Set-Cookie,omitempty"`
+	Rtt                  int64  `json:"RTT"`
+	Timestamp            time.Time
+}
+
+// Parse ElasticSearch URI
+//
+// Proper format is: host:port/index_name
+func parseURI(URI string) (err error, host string, port string, index string) {
+	rURI := regexp.MustCompile("(.+):([0-9]+)/(.+)")
+	match := rURI.FindAllStringSubmatch(URI, -1)
+
+	if len(match) == 0 {
+		err = new(ESUriErorr)
+	} else {
+		host = match[0][1]
+		port = match[0][2]
+		index = match[0][3]
+	}
+
+	return
+}
+
+func (p *ESPlugin) Init(URI string) {
+	var err error
+
+	err, p.Host, p.ApiPort, p.Index = parseURI(URI)
+
+	if err != nil {
+		log.Fatal("Can't initialize ElasticSearch plugin.", err)
+	}
+	p.eConn = elastigo.NewConn()
+	p.eConn.SetPort(p.ApiPort)
+	p.eConn.SetHosts([]string{p.Host})
+
+	p.indexor = p.eConn.NewBulkIndexerErrors(50, 60)
+	p.done = make(chan bool)
+	p.indexor.Start()
+
+	if Settings.verbose {
+		// Only start the ErrorHandler goroutine when in verbose mode
+		// no need to burn ressources otherwise
+		go p.ErrorHandler()
+	}
+
+	log.Println("Initialized Elasticsearch Plugin")
+	return
+}
+
+func (p *ESPlugin) IndexerShutdown() {
+	p.indexor.Stop()
+	return
+}
+
+func (p *ESPlugin) ErrorHandler() {
+	for {
+		errBuf := <-p.indexor.ErrorChannel
+		log.Println(errBuf.Err)
+	}
+}
+
+func (p *ESPlugin) RttDurationToMs(d time.Duration) int64 {
+	sec := d / time.Second
+	nsec := d % time.Second
+	fl := float64(sec) + float64(nsec)*1e-6
+	return int64(fl)
+}
+
+func (p *ESPlugin) ResponseAnalyze(req, resp []byte, start, stop time.Time) {
+	if len(resp) == 0 {
+		// nil http response - skipped elasticsearch export for this request
+		return
+	}
+	t := time.Now()
+	rtt := p.RttDurationToMs(stop.Sub(start))
+	req = payloadBody(req)
+
+	esResp := ESRequestResponse{
+		ReqURL:               string(proto.Path(req)),
+		ReqMethod:            string(proto.Method(req)),
+		ReqUserAgent:         string(proto.Header(req, []byte("User-Agent"))),
+		ReqAcceptLanguage:    string(proto.Header(req, []byte("Accept-Language"))),
+		ReqAccept:            string(proto.Header(req, []byte("Accept"))),
+		ReqAcceptEncoding:    string(proto.Header(req, []byte("Accept-Encoding"))),
+		ReqIfModifiedSince:   string(proto.Header(req, []byte("If-Modified-Since"))),
+		ReqConnection:        string(proto.Header(req, []byte("Connection"))),
+		ReqCookies:           string(proto.Header(req, []byte("Cookie"))),
+		RespStatus:           string(proto.Status(resp)),
+		RespStatusCode:       string(proto.Status(resp)),
+		RespProto:            string(proto.Method(resp)),
+		RespContentLength:    string(proto.Header(resp, []byte("Content-Length"))),
+		RespContentType:      string(proto.Header(resp, []byte("Content-Type"))),
+		RespTransferEncoding: string(proto.Header(resp, []byte("Transfer-Encoding"))),
+		RespContentEncoding:  string(proto.Header(resp, []byte("Content-Encoding"))),
+		RespExpires:          string(proto.Header(resp, []byte("Expires"))),
+		RespCacheControl:     string(proto.Header(resp, []byte("Cache-Control"))),
+		RespVary:             string(proto.Header(resp, []byte("Vary"))),
+		RespSetCookie:        string(proto.Header(resp, []byte("Set-Cookie"))),
+		Rtt:                  rtt,
+		Timestamp:            t,
+	}
+	j, err := json.Marshal(&esResp)
+	if err != nil {
+		log.Println(err)
+	} else {
+		p.indexor.Index(p.Index, "RequestResponse", "", "", "", &t, j)
+	}
+	return
+}

emitter.go

@@ -0,0 +1,139 @@
+package main
+
+import (
+	"bytes"
+	"io"
+	"time"
+)
+
+// Start initialize loop for sending data from inputs to outputs
+func Start(stop chan int) {
+	if Settings.middleware != "" {
+		middleware := NewMiddleware(Settings.middleware)
+
+		for _, in := range Plugins.Inputs {
+			middleware.ReadFrom(in)
+		}
+
+		// We are going only to read responses, so using same ReadFrom method
+		for _, out := range Plugins.Outputs {
+			if r, ok := out.(io.Reader); ok {
+				middleware.ReadFrom(r)
+			}
+		}
+
+		go CopyMulty(middleware, Plugins.Outputs...)
+	} else {
+		for _, in := range Plugins.Inputs {
+			go CopyMulty(in, Plugins.Outputs...)
+		}
+	}
+
+	for {
+		select {
+		case <-stop:
+			finalize()
+			return
+		case <-time.After(100 * time.Millisecond):
+		}
+	}
+}
+
+// CopyMulty copies from 1 reader to multiple writers
+func CopyMulty(src io.Reader, writers ...io.Writer) (err error) {
+	buf := make([]byte, 5*1024*1024)
+	wIndex := 0
+	modifier := NewHTTPModifier(&Settings.modifierConfig)
+	filteredRequests := make(map[string]time.Time)
+	filteredRequestsLastCleanTime := time.Now()
+
+	i := 0
+
+	for {
+		nr, er := src.Read(buf)
+
+		if nr > 0 && len(buf) > nr {
+			payload := buf[:nr]
+			meta := payloadMeta(payload)
+			requestID := string(meta[1])
+
+			_maxN := nr
+			if nr > 500 {
+				_maxN = 500
+			}
+
+			if Settings.debug {
+				Debug("[EMITTER] input:", string(payload[0:_maxN]), nr, "from:", src)
+			}
+
+			if modifier != nil {
+				if isRequestPayload(payload) {
+					headSize := bytes.IndexByte(payload, '\n') + 1
+					body := payload[headSize:]
+					originalBodyLen := len(body)
+					body = modifier.Rewrite(body)
+
+					// If modifier tells to skip request
+					if len(body) == 0 {
+						filteredRequests[requestID] = time.Now()
+						continue
+					}
+
+					if originalBodyLen != len(body) {
+						payload = append(payload[:headSize], body...)
+					}
+
+					if Settings.debug {
+						Debug("[EMITTER] Rewritten input:", len(payload), "First 500 bytes:", string(payload[0:_maxN]))
+					}
+				} else {
+					if _, ok := filteredRequests[requestID]; ok {
+						delete(filteredRequests, requestID);
+						continue
+					}
+				}
+			}
+
+			if Settings.splitOutput {
+				// Simple round robin
+				writers[wIndex].Write(payload)
+
+				wIndex++
+
+				if wIndex >= len(writers) {
+					wIndex = 0
+				}
+			} else {
+				for _, dst := range writers {
+					dst.Write(payload)
+				}
+			}
+
+		}
+		if er == io.EOF {
+			break
+		}
+		if er != nil {
+			err = er
+			break
+		}
+
+		// Run GC on each 1000 request
+		if i % 1000 == 0 {
+			// Clean up filtered requests for which we didn't get a response to filter
+			now := time.Now()
+			if now.Sub(filteredRequestsLastCleanTime) > 60 * time.Second {
+				for k, v := range filteredRequests {
+					if now.Sub(v) > 60 * time.Second {
+						delete(filteredRequests, k)
+					}
+				}
+				filteredRequestsLastCleanTime = time.Now()
+			}
+		}
+
+		i++
+	}
+
+	return err
+}

emitter_test.go

@@ -0,0 +1,145 @@
+package main
+
+import (
+	"io"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestEmitter(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestEmitterFiltered(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+	input.skipHeader = true
+
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+	methods := HTTPMethods{[]byte("GET")}
+	Settings.modifierConfig = HTTPModifierConfig{methods: methods}
+
+	go Start(quit)
+
+	wg.Add(2)
+
+	id := uuid()
+	reqh := payloadHeader(RequestPayload, id, time.Now().UnixNano(), -1)
+	reqb := append(reqh, []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+	resh := payloadHeader(ResponsePayload, id, time.Now().UnixNano()+1, 1)
+	respb := append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
+
+	input.EmitBytes(reqb)
+	input.EmitBytes(respb)
+
+	id = uuid()
+	reqh = payloadHeader(RequestPayload, id, time.Now().UnixNano(), -1)
+	reqb = append(reqh, []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+	resh = payloadHeader(ResponsePayload, id, time.Now().UnixNano()+1, 1)
+	respb = append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
+
+	input.EmitBytes(reqb)
+	input.EmitBytes(respb)
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestEmitterRoundRobin(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+
+	var counter1, counter2 int32
+
+	output1 := NewTestOutput(func(data []byte) {
+		atomic.AddInt32(&counter1, 1)
+		wg.Done()
+	})
+
+	output2 := NewTestOutput(func(data []byte) {
+		atomic.AddInt32(&counter2, 1)
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output1, output2}
+
+	Settings.splitOutput = true
+
+	go Start(quit)
+
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+
+	if counter1 == 0 || counter2 == 0 {
+		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
+	}
+
+	Settings.splitOutput = false
+}
+
+func BenchmarkEmitter(b *testing.B) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+	close(quit)
+}

examples/middleware/echo.clj

@@ -0,0 +1,53 @@
+(ns echo.core
+  (:gen-class)
+  (:require [clojure.string :as cs]
+            [clojure.java.io :as io])
+  (:import org.apache.commons.codec.binary.Hex
+           java.io.BufferedReader
+           java.io.IOException
+           java.io.InputStreamReader))
+
+
+(defn transform-http-msg
+  "Function that transforms/filters the incoming HTTP messages."
+  [headers body]
+  ;; do actual transformations here
+  [headers body])
+
+
+(defn decode-hex-string
+  "Decode an Hex-encoded string."
+  [s]
+  (String. (Hex/decodeHex (.toCharArray s))))
+
+
+(defn encode-hex-string
+  "Encode a string to a hex-encoded string."
+  [^String s]
+  (String. (Hex/encodeHex (.getBytes s))))
+
+
+(defn -main
+  [& args]
+  (let [br (BufferedReader. (InputStreamReader. System/in))]
+    (try
+      (loop [hex-line (.readLine br)]
+        (let [decoded-req (decode-hex-string hex-line)
+
+              ;; empty line separates headers from body
+              http-request (partition-by empty? (cs/split-lines decoded-req))
+              headers (first http-request)
+
+              ;; HTTP messages can contain no body:
+              body (when (= 3 (count http-request)) (last http-request))
+              [new-headers new-body] (transform-http-msg headers body)]
+
+          (println (encode-hex-string (str (cs/join "\n" headers)
+                                           (when body
+                                             (str "\n\n"
+                                                  (cs/join "\n" body)))))))
+        (when-let [line (.readLine br)]
+          (recur line)))
+      (catch IOException e nil))))
+
+

examples/middleware/echo.java

@@ -0,0 +1,48 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+
+
+class Echo {
+    public static String decodeHexString(String s) throws DecoderException {
+        return new String(Hex.decodeHex(s.toCharArray()));
+    }
+
+    public static String encodeHexString(String s) {
+        return new String(Hex.encodeHex(s.getBytes()));
+    }
+
+    public static String transformHTTPMessage(String req) {
+        // do actual transformations here
+        return req;
+    }
+
+    public static void main(String[] args) throws DecoderException {
+        if(args != null){
+            for(String arg : args){
+                System.out.println(arg);
+            }
+
+        }
+
+        BufferedReader stdin = new BufferedReader(new InputStreamReader(
+                                                                        System.in));
+        String line = null;
+
+        try {
+            while ((line = stdin.readLine()) != null) {
+                String decodedLine = decodeHexString(line);
+
+                String transformedLine = transformHTTPMessage(decodedLine);
+
+                String encodedLine = encodeHexString(transformedLine);
+                System.out.println(encodedLine);
+
+            }
+        } catch (IOException e) {
+        }
+    }
+}

examples/middleware/echo.rb

@@ -0,0 +1,22 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+while data = STDIN.gets # continiously read line from STDIN
+  next unless data
+  data = data.chomp # remove end of line symbol
+  
+  decoded = [data].pack("H*") # decode base64 encoded request
+  
+  # dedoded value is raw HTTP payload, example:
+  #   
+  #   POST /post HTTP/1.1
+  #   Content-Length: 7
+  #   Host: www.w3.org
+  #
+  #   a=1&b=2"
+  
+  encoded = decoded.unpack("H*").first # encoding back to base64
+  
+  # Emit request back
+  # You can skip this if want to filter out request
+  STDOUT.puts encoded
+end

examples/middleware/echo.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+#
+# `xxd` utility included into vim-common package
+# It allow hex decoding/encoding
+# 
+# This example may broke if you request contains `null` string, you may consider using pipes instead.
+# See: https://github.com/buger/gor/issues/309
+# 
+
+function log {
+    # Logging to stderr, because stdout/stdin used for data transfer
+    >&2 echo "[DEBUG][ECHO] $1"
+}
+
+while read line; do
+    decoded=$(echo -e "$line" | xxd -r -p)
+
+    header=$(echo -e "$decoded" | head -n +1)
+    payload=$(echo -e "$decoded" | tail -n +2)
+
+    encoded=$(echo -e "$header\n$payload" | xxd -p | tr -d "\\n")
+
+    log ""
+    log "==================================="
+
+    case ${header:0:1} in
+    "1")
+        log "Request type: Request"
+        ;;
+    "2")
+        log "Request type: Original Response"
+        ;;
+    "3")
+        log "Request type: Replayed Response"
+        ;;
+    *)
+        log "Unknown request type $header"
+    esac
+    echo "$encoded"
+
+    log "==================================="
+
+    log "Original data: $line"
+    log "Decoded request: $decoded"
+    log "Encoded data: $encoded"
+done;

examples/middleware/token_modifier.go

@@ -0,0 +1,119 @@
+/*
+This middleware made for auth system that randomly generate access tokens, which used later for accessing secure content. Since there is no pre-defined token value, naive approach without middleware (or if middleware use only request payloads) will fail, because replayed server have own tokens, not synced with origin. To fix this, our middleware should take in account responses of replayed and origin server, store `originalToken -> replayedToken` aliases and rewrite all requests using this token to use replayed alias. See `middleware_test.go#TestTokenMiddleware` test for examples of using this middleware.
+
+How middleware works:
+
+                   Original request      +--------------+
++-------------+----------STDIN---------->+              |
+|  Gor input  |                          |  Middleware  |
++-------------+----------STDIN---------->+              |
+                   Original response     +------+---+---+
+                                                |   ^
++-------------+    Modified request             v   |
+| Gor output  +<---------STDOUT-----------------+   |
++-----+-------+                                     |
+      |                                             |
+      |            Replayed response                |
+      +------------------STDIN----------------->----+
+*/
+
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"github.com/buger/gor/proto"
+	"os"
+)
+
+// requestID -> originalToken
+var originalTokens map[string][]byte
+
+// originalToken -> replayedToken
+var tokenAliases map[string][]byte
+
+func main() {
+	originalTokens = make(map[string][]byte)
+	tokenAliases = make(map[string][]byte)
+
+	scanner := bufio.NewScanner(os.Stdin)
+
+	for scanner.Scan() {
+		encoded := scanner.Bytes()
+		buf := make([]byte, len(encoded)/2)
+		hex.Decode(buf, encoded)
+
+		process(buf)
+	}
+}
+
+func process(buf []byte) {
+	// First byte indicate payload type, possible values:
+	//  1 - Request
+	//  2 - Response
+	//  3 - ReplayedResponse
+	payloadType := buf[0]
+	headerSize := bytes.IndexByte(buf, '\n') + 1
+	header := buf[:headerSize-1]
+
+	// Header contains space separated values of: request type, request id, and request start time (or round-trip time for responses)
+	meta := bytes.Split(header, []byte(" "))
+	// For each request you should receive 3 payloads (request, response, replayed response) with same request id
+	reqID := string(meta[1])
+	payload := buf[headerSize:]
+
+	Debug("Received payload:", string(buf))
+
+	switch payloadType {
+	case '1': // Request
+		if bytes.Equal(proto.Path(payload), []byte("/token")) {
+			originalTokens[reqID] = []byte{}
+			Debug("Found token request:", reqID)
+		} else {
+			token, vs, _ := proto.PathParam(payload, []byte("token"))
+
+			if vs != -1 { // If there is GET token param
+				if alias, ok := tokenAliases[string(token)]; ok {
+					// Rewrite original token to alias
+					payload = proto.SetPathParam(payload, []byte("token"), alias)
+
+					// Copy modified payload to our buffer
+					buf = append(buf[:headerSize], payload...)
+				}
+			}
+		}
+
+		// Emitting data back
+		os.Stdout.Write(encode(buf))
+	case '2': // Original response
+		if _, ok := originalTokens[reqID]; ok {
+			// Token is inside response body
+			secureToken := proto.Body(payload)
+			originalTokens[reqID] = secureToken
+			Debug("Remember origial token:", string(secureToken))
+		}
+	case '3': // Replayed response
+		if originalToken, ok := originalTokens[reqID]; ok {
+			delete(originalTokens, reqID)
+			secureToken := proto.Body(payload)
+			tokenAliases[string(originalToken)] = secureToken
+
+			Debug("Create alias for new token token, was:", string(originalToken), "now:", string(secureToken))
+		}
+	}
+}
+
+func encode(buf []byte) []byte {
+	dst := make([]byte, len(buf)*2+1)
+	hex.Encode(dst, buf)
+	dst[len(dst)-1] = '\n'
+
+	return dst
+}
+
+func Debug(args ...interface{}) {
+	fmt.Fprint(os.Stderr, "[DEBUG][TOKEN-MOD] ")
+	fmt.Fprintln(os.Stderr, args...)
+}

gor.go

@@ -1,77 +1,135 @@
 // Gor is simple http traffic replication tool written in Go. Its main goal to replay traffic from production servers to staging and dev environments.
 // Now you can test your code on real user sessions in an automated and repeatable fashion.
-//
-// Gor consists of 2 parts: listener and replay servers.
-// Listener catch http traffic from given port in real-time and send it to replay server via UDP. Replay server forwards traffic to given address.
 package main
 
 import (
 	"flag"
 	"fmt"
-	"github.com/buger/gor/listener"
-	"github.com/buger/gor/replay"
+	"io"
 	"log"
+	"net/http"
+	"net/http/httputil"
 	"os"
+	"os/signal"
+	"runtime"
+	_ "runtime/debug"
 	"runtime/pprof"
+	"syscall"
 	"time"
 )
 
-const (
-	VERSION = "0.3.2"
+var (
+	mode       string
+	cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
+	memprofile = flag.String("memprofile", "", "write memory profile to this file")
 )
 
-var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
-var memprofile = flag.String("memprofile", "", "write memory profile to this file")
+func loggingMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		rb, _ := httputil.DumpRequest(r, false)
+		log.Println(string(rb))
+		next.ServeHTTP(w, r)
+	})
+}
 
 func main() {
+	// // Don't exit on panic
+	// defer func() {
+	// 	if r := recover(); r != nil {
+	// 		fmt.Printf("PANIC: pkg: %v %s \n", r, debug.Stack())
+	// 	}
+	// }()
+
+	// If not set via env cariable
+	if len(os.Getenv("GOMAXPROCS")) == 0 {
+		runtime.GOMAXPROCS(runtime.NumCPU() * 2)
+	}
+
+	args := os.Args[1:]
+	if len(args) > 0 && args[0] == "file-server" {
+		if len(args) != 2 {
+			log.Fatal("You should specify port and IP (optional) for the file server. Example: `gor file-server :80`")
+		}
+		dir, _ := os.Getwd()
+
+		log.Println("Started example file server for current dirrectory on address ", args[1])
+
+		log.Fatal(http.ListenAndServe(args[1], loggingMiddleware(http.FileServer(http.Dir(dir)))))
+	} else {
+		flag.Parse()
+		InitPlugins()
+	}
+
 	fmt.Println("Version:", VERSION)
 
-	mode := "unknown"
-
-	if len(os.Args) > 1 {
-		mode = os.Args[1]
+	if len(Plugins.Inputs) == 0 || len(Plugins.Outputs) == 0 {
+		log.Fatal("Required at least 1 input and 1 output")
 	}
 
-	if mode != "listen" && mode != "replay" {
-		fmt.Println("Usage: \n\tgor listen -h\n\tgor replay -h")
-		return
+	if *memprofile != "" {
+		profileMEM(*memprofile)
 	}
 
-	// Remove mode attr
-	os.Args = append(os.Args[:1], os.Args[2:]...)
-
-	flag.Parse()
-
 	if *cpuprofile != "" {
-		f, err := os.Create(*cpuprofile)
+		profileCPU(*cpuprofile)
+	}
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		<-c
+		finalize()
+		os.Exit(1)
+	}()
+
+	if Settings.exitAfter > 0 {
+		log.Println("Running gor for a duration of", Settings.exitAfter)
+		closeCh := make(chan int)
+
+		time.AfterFunc(Settings.exitAfter, func() {
+			log.Println("Stopping gor after", Settings.exitAfter)
+			close(closeCh)
+		})
+
+		Start(closeCh)
+	} else {
+		Start(nil)
+	}
+}
+
+func finalize() {
+	for _, p := range Plugins.All {
+		if cp, ok := p.(io.Closer); ok {
+			cp.Close()
+		}
+	}
+}
+
+func profileCPU(cpuprofile string) {
+	if cpuprofile != "" {
+		f, err := os.Create(cpuprofile)
 		if err != nil {
 			log.Fatal(err)
 		}
 		pprof.StartCPUProfile(f)
 
-		time.AfterFunc(60*time.Second, func() {
+		time.AfterFunc(30*time.Second, func() {
 			pprof.StopCPUProfile()
 			f.Close()
-			log.Println("Stop profiling after 60 seconds")
+			log.Println("Stop profiling after 30 seconds")
 		})
 	}
+}
 
-	if *memprofile != "" {
-		f, err := os.Create(*memprofile)
+func profileMEM(memprofile string) {
+	if memprofile != "" {
+		f, err := os.Create(memprofile)
 		if err != nil {
 			log.Fatal(err)
 		}
-		time.AfterFunc(60*time.Second, func() {
+		time.AfterFunc(30*time.Second, func() {
 			pprof.WriteHeapProfile(f)
 			f.Close()
 		})
 	}
-
-	switch mode {
-	case "listen":
-		listener.Run()
-	case "replay":
-		replay.Run()
-	}
-
 }

gor_stat.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"log"
+	"runtime"
+	"strconv"
+	"time"
+)
+
+const (
+	rate = 5
+)
+
+type GorStat struct {
+	statName string
+	latest   int
+	mean     int
+	max      int
+	count    int
+}
+
+func NewGorStat(statName string) (s *GorStat) {
+	s = new(GorStat)
+	s.statName = statName
+	s.latest = 0
+	s.mean = 0
+	s.max = 0
+	s.count = 0
+
+	if Settings.stats {
+		log.Println(s.statName + ":latest,mean,max,count,count/second,gcount")
+		go s.reportStats()
+	}
+	return
+}
+
+func (s *GorStat) Write(latest int) {
+	if Settings.stats {
+		if latest > s.max {
+			s.max = latest
+		}
+		if latest != 0 {
+			s.mean = (s.mean + latest) / 2
+		}
+		s.latest = latest
+		s.count = s.count + 1
+	}
+}
+
+func (s *GorStat) Reset() {
+	s.latest = 0
+	s.max = 0
+	s.mean = 0
+	s.count = 0
+}
+
+func (s *GorStat) String() string {
+	return s.statName + ":" + strconv.Itoa(s.latest) + "," + strconv.Itoa(s.mean) + "," + strconv.Itoa(s.max) + "," + strconv.Itoa(s.count) + "," + strconv.Itoa(s.count/rate) + "," + strconv.Itoa(runtime.NumGoroutine())
+}
+
+func (s *GorStat) reportStats() {
+	for {
+		log.Println(s)
+		s.Reset()
+		time.Sleep(rate * time.Second)
+	}
+}

homebrew/gor.rb

@@ -0,0 +1,46 @@
+require "language/go"
+
+class Gor < Formula
+  desc "Real-time HTTP traffic replay tool written in Go"
+  homepage "https://gortool.com"
+  url "https://github.com/buger/gor/archive/v0.14.0.tar.gz"
+  sha256 "62260a6f5cabde571b91d5762fba9c47691643df0a58565cbe808854cd064dc8"
+  head "https://github.com/buger/gor.git"
+
+  bottle do
+    cellar :any_skip_relocation
+    sha256 "c382403de70a41b7445920a02051f5e82030704aaaae70cfcd4e8f401cc87f6a" => :el_capitan
+    sha256 "4b76b3785584897800e87967f1af9510208faefe46f57d7bd6f8b40a7133c19b" => :yosemite
+    sha256 "d186cb1566d33ab8f78215e69934f49dd96becb1c236905b4502d94399ae1974" => :mavericks
+  end
+
+  depends_on "go" => :build
+
+  go_resource "github.com/bitly/go-hostpool" do
+    url "https://github.com/bitly/go-hostpool.git",
+      :revision => "d0e59c22a56e8dadfed24f74f452cea5a52722d2"
+  end
+
+  go_resource "github.com/buger/elastigo" do
+    url "https://github.com/buger/elastigo.git",
+      :revision => "23fcfd9db0d8be2189a98fdab77a4c90fcc3a1e9"
+  end
+
+  go_resource "github.com/google/gopacket" do
+    url "https://github.com/google/gopacket.git",
+      :revision => "aa09ced736460d76535444c825932a0742975f7d"
+  end
+
+  def install
+    ENV["GOPATH"] = buildpath
+    mkdir_p buildpath/"src/github.com/buger/"
+    ln_sf buildpath, buildpath/"src/github.com/buger/gor"
+    Language::Go.stage_deps resources, buildpath/"src"
+
+    system "go", "build", "-o", "#{bin}/gor", "-ldflags", "-X main.VERSION \"#{version}\""
+  end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/gor", 1)
+  end
+end

http_client.go

@@ -0,0 +1,372 @@
+package main
+
+import (
+	"bytes"
+	"crypto/tls"
+	"encoding/base64"
+	"io"
+	"log"
+	"net"
+	"net/url"
+	"runtime/debug"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/buger/gor/proto"
+)
+
+var httpMu sync.Mutex
+
+const (
+	readChunkSize   = 64 * 1024
+	maxResponseSize = 1073741824
+)
+
+var chunkedSuffix = []byte("0\r\n\r\n")
+
+var defaultPorts = map[string]string{
+	"http":  "80",
+	"https": "443",
+}
+
+type HTTPClientConfig struct {
+	FollowRedirects    int
+	Debug              bool
+	OriginalHost       bool
+	ConnectionTimeout  time.Duration
+	Timeout            time.Duration
+	ResponseBufferSize int
+}
+
+type HTTPClient struct {
+	baseURL        string
+	scheme         string
+	host           string
+	auth           string
+	conn           net.Conn
+	respBuf        []byte
+	config         *HTTPClientConfig
+	redirectsCount int
+}
+
+func NewHTTPClient(baseURL string, config *HTTPClientConfig) *HTTPClient {
+	if !strings.HasPrefix(baseURL, "http") {
+		baseURL = "http://" + baseURL
+	}
+
+	u, _ := url.Parse(baseURL)
+
+	if config.Timeout == 0 {
+		config.Timeout = time.Second
+    }
+
+	config.ConnectionTimeout = config.Timeout
+
+	if config.ResponseBufferSize == 0 {
+		config.ResponseBufferSize = 100 * 1024 // 100kb
+	}
+
+	client := new(HTTPClient)
+	client.baseURL = u.String()
+	client.host = u.Host
+	client.scheme = u.Scheme
+	client.respBuf = make([]byte, config.ResponseBufferSize)
+	client.config = config
+
+	if u.User != nil {
+		client.auth = "Basic " + base64.StdEncoding.EncodeToString([]byte(u.User.String()))
+	}
+
+	return client
+}
+
+func (c *HTTPClient) Connect() (err error) {
+	c.Disconnect()
+
+	if !strings.Contains(c.host, ":") {
+		c.conn, err = net.DialTimeout("tcp", c.host + ":" + defaultPorts[c.scheme], c.config.ConnectionTimeout)
+	} else {
+		c.conn, err = net.DialTimeout("tcp", c.host, c.config.ConnectionTimeout)
+	}
+
+	if c.scheme == "https" {
+		tlsConn := tls.Client(c.conn, &tls.Config{InsecureSkipVerify: true, ServerName: c.host})
+
+		if err = tlsConn.Handshake(); err != nil {
+			return
+		}
+
+		c.conn = tlsConn
+	}
+
+	return
+}
+
+func (c *HTTPClient) Disconnect() {
+	if c.conn != nil {
+		c.conn.Close()
+		c.conn = nil
+		Debug("[HTTP] Disconnected: ", c.baseURL)
+	}
+}
+
+func (c *HTTPClient) isAlive() bool {
+	one := make([]byte, 1)
+
+	// Ready 1 byte from socket without timeout to check if it not closed
+	c.conn.SetReadDeadline(time.Now().Add(time.Millisecond))
+	_, err := c.conn.Read(one)
+
+	if err == nil {
+		return true
+	} else if err == io.EOF {
+		if c.config.Debug {
+			Debug("[HTTPClient] connection closed, reconnecting")
+		}
+		return false
+	} else if err == syscall.EPIPE {
+		Debug("Detected broken pipe.", err)
+		return false
+	}
+
+	return true
+}
+
+func (c *HTTPClient) Send(data []byte) (response []byte, err error) {
+	// Don't exit on panic
+	defer func() {
+		if r := recover(); r != nil {
+			Debug("[HTTPClient]", r, string(data))
+
+			if _, ok := r.(error); !ok {
+				log.Println("[HTTPClient] Failed to send request: ", string(data))
+				log.Println("PANIC: pkg:", r, debug.Stack())
+			}
+		}
+	}()
+
+	if c.conn == nil || !c.isAlive() {
+		Debug("[HTTPClient] Connecting:", c.baseURL)
+		if err = c.Connect(); err != nil {
+			log.Println("[HTTPClient] Connection error:", err)
+			response = errorPayload(HTTP_CONNECTION_ERROR)
+			return
+		}
+	}
+
+	timeout := time.Now().Add(c.config.Timeout)
+
+	c.conn.SetWriteDeadline(timeout)
+
+	if !c.config.OriginalHost {
+		data = proto.SetHost(data, []byte(c.baseURL), []byte(c.host))
+	}
+
+	if c.auth != "" {
+		data = proto.SetHeader(data, []byte("Authorization"), []byte(c.auth))
+	}
+
+	if c.config.Debug {
+		Debug("[HTTPClient] Sending:", string(data))
+	}
+
+	if _, err = c.conn.Write(data); err != nil {
+		Debug("[HTTPClient] Write error:", err, c.baseURL)
+		response = errorPayload(HTTP_TIMEOUT)
+		return
+	}
+
+	var readBytes, n int
+	var currentChunk []byte
+	timeout = time.Now().Add(c.config.Timeout)
+	chunked := false
+	contentLength := -1
+	currentContentLength := 0
+	chunks := 0
+
+	for {
+		c.conn.SetReadDeadline(timeout)
+
+		if readBytes < len(c.respBuf) {
+			n, err = c.conn.Read(c.respBuf[readBytes:])
+			readBytes += n
+			chunks++
+
+			if err != nil {
+				if err == io.EOF {
+					err = nil
+				}
+				break
+			}
+
+			// First chunk
+			if chunked || contentLength != -1 {
+				currentContentLength += n
+			} else {
+				// If headers are finished
+				if bytes.Contains(c.respBuf[:readBytes], proto.EmptyLine) {
+					if bytes.Equal(proto.Header(c.respBuf, []byte("Transfer-Encoding")), []byte("chunked")) {
+						chunked = true
+					} else {
+						status, _ := strconv.Atoi(string(proto.Status(c.respBuf)))
+						if (status >= 100 && status < 200) || status == 204 || status == 304 {
+							contentLength = 0
+						} else {
+							l := proto.Header(c.respBuf, []byte("Content-Length"))
+							if len(l) > 0 {
+								contentLength, _ = strconv.Atoi(string(l))
+							}
+						}
+					}
+
+					currentContentLength += len(proto.Body(c.respBuf[:readBytes]))
+				}
+			}
+
+			if chunked {
+				// Check if chunked message finished
+				if bytes.HasSuffix(c.respBuf[:readBytes], chunkedSuffix) {
+					break
+				}
+			} else if contentLength != -1 {
+				if currentContentLength > contentLength {
+					Debug("[HTTPClient] disconnected, wrong length", currentContentLength, contentLength)
+					c.Disconnect()
+					break
+				} else if currentContentLength == contentLength {
+					break
+				}
+			}
+		} else {
+			if currentChunk == nil {
+				currentChunk = make([]byte, readChunkSize)
+			}
+
+			n, err = c.conn.Read(currentChunk)
+
+			if err == io.EOF {
+				break
+			} else if err != nil {
+				Debug("[HTTPClient] Read the whole body error:", err, c.baseURL)
+				break
+			}
+
+			readBytes += int(n)
+			chunks++
+			currentContentLength += n
+
+			if chunked {
+				// Check if chunked message finished
+				if bytes.HasSuffix(currentChunk[:n], chunkedSuffix) {
+					break
+				}
+			} else if contentLength != -1 {
+				if currentContentLength > contentLength {
+					Debug("[HTTPClient] disconnected, wrong length", currentContentLength, contentLength)
+					c.Disconnect()
+					break
+				} else if currentContentLength == contentLength {
+					break
+				}
+			} else {
+				Debug("[HTTPClient] disconnected, can't find Content-Length or Chunked")
+				c.Disconnect()
+				break
+			}
+		}
+
+		if readBytes >= maxResponseSize {
+			Debug("[HTTPClient] Body is more than the max size", maxResponseSize,
+				c.baseURL)
+			break
+		}
+
+		// For following chunks expect less timeout
+		timeout = time.Now().Add(c.config.Timeout / 5)
+	}
+
+	if err != nil {
+		Debug("[HTTPClient] Response read error", err, c.conn, readBytes)
+		response = errorPayload(HTTP_TIMEOUT)
+		return
+	}
+
+	if readBytes > len(c.respBuf) {
+		readBytes = len(c.respBuf)
+	}
+	payload := make([]byte, readBytes)
+	copy(payload, c.respBuf[:readBytes])
+
+	if c.config.Debug {
+		Debug("[HTTPClient] Received:", string(payload))
+	}
+
+	if c.config.FollowRedirects > 0 && c.redirectsCount < c.config.FollowRedirects {
+		status := payload[9:12]
+
+		// 3xx requests
+		if status[0] == '3' {
+			c.redirectsCount++
+
+			location := proto.Header(payload, []byte("Location"))
+			redirectPayload := []byte("GET " + string(location) + " HTTP/1.1\r\n\r\n")
+
+			if c.config.Debug {
+				Debug("[HTTPClient] Redirecting to: " + string(location))
+			}
+
+			return c.Send(redirectPayload)
+		}
+	}
+
+	if bytes.Equal(proto.Status(payload), []byte("400")) {
+		c.Disconnect()
+		Debug("[HTTPClient] Closed connection on 400 response")
+	}
+
+	c.redirectsCount = 0
+
+	return payload, err
+}
+
+func (c *HTTPClient) Get(path string) (response []byte, err error) {
+	payload := "GET " + path + " HTTP/1.1\r\n\r\n"
+
+	return c.Send([]byte(payload))
+}
+
+func (c *HTTPClient) Post(path string, body []byte) (response []byte, err error) {
+	payload := "POST " + path + " HTTP/1.1\r\n"
+	payload += "Content-Length: " + strconv.Itoa(len(body)) + "\r\n\r\n"
+	payload += string(body)
+
+	return c.Send([]byte(payload))
+}
+
+const (
+	// https://support.cloudflare.com/hc/en-us/articles/200171936-Error-520-Web-server-is-returning-an-unknown-error
+	HTTP_UNKNOWN_ERROR = "520"
+	// https://support.cloudflare.com/hc/en-us/articles/200171916-Error-521-Web-server-is-down
+	HTTP_CONNECTION_ERROR = "521"
+	// https://support.cloudflare.com/hc/en-us/articles/200171906-Error-522-Connection-timed-out
+	HTTP_CONNECTION_TIMEOUT = "522"
+	// https://support.cloudflare.com/hc/en-us/articles/200171946-Error-523-Origin-is-unreachable
+	HTTP_UNREACHABLE = "523"
+	// https://support.cloudflare.com/hc/en-us/articles/200171926-Error-524-A-timeout-occurred
+	HTTP_TIMEOUT = "524"
+)
+
+var errorPayloadTemplate = "HTTP/1.1 202 Accepted\r\nDate: Mon, 17 Aug 2015 14:10:11 GMT\r\nContent-Length: 0\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n"
+
+func errorPayload(errorCode string) []byte {
+	payload := make([]byte, len(errorPayloadTemplate))
+	copy(payload, errorPayloadTemplate)
+
+	copy(payload[29:58], []byte(time.Now().Format(time.RFC1123)))
+	copy(payload[9:12], errorCode)
+
+	return payload
+}

http_client_test.go

@@ -0,0 +1,484 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"github.com/buger/gor/proto"
+	"io/ioutil"
+	_ "log"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/http/httputil"
+	_ "reflect"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestHTTPClientURLPort(t *testing.T) {
+	c1 := NewHTTPClient("http://example.com", &HTTPClientConfig{})
+	if c1.baseURL != "http://example.com" {
+		t.Error("Sould not add 80 port for http:", c1.baseURL)
+	}
+
+	c2 := NewHTTPClient("https://example.com", &HTTPClientConfig{})
+	if c2.baseURL != "https://example.com" {
+		t.Error("Sould not add 443 port for https:", c2.baseURL)
+	}
+
+	c3 := NewHTTPClient("https://example.com:1", &HTTPClientConfig{})
+	if c3.baseURL != "https://example.com:1" {
+		t.Error("Sould use specified port:", c3.baseURL)
+	}
+
+	c4 := NewHTTPClient("example.com", &HTTPClientConfig{})
+	if c4.baseURL != "http://example.com" {
+		t.Error("Sould not add default protocol:", c4.baseURL)
+	}
+}
+
+func TestHTTPClientSend(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	payload := func(reqType string) []byte {
+		switch reqType {
+		case "GET":
+			return []byte("GET / HTTP/1.1\r\n\r\n")
+		case "POST":
+			return []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+		case "POST_CHUNKED":
+			return []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
+		}
+
+		return []byte("")
+	}
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		if r.Method == "POST" {
+			defer r.Body.Close()
+			body, _ := ioutil.ReadAll(r.Body)
+
+			if len(r.TransferEncoding) > 0 && r.TransferEncoding[0] == "chunked" {
+				if string(body) != "Wikipedia in\r\n\r\nchunks." {
+					t.Error("Wrong POST body:", body, string(body))
+				}
+			} else {
+				if string(body) != "a=1&b=2" {
+					buf, _ := httputil.DumpRequest(r, true)
+					t.Error("Wrong POST body:", string(body), string(buf))
+				}
+			}
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true})
+
+	wg.Add(4)
+	client.Send(payload("POST"))
+	client.Send(payload("GET"))
+	client.Send(payload("POST_CHUNKED"))
+	client.Send(payload("POST"))
+
+	wg.Wait()
+}
+
+func TestHTTPClientResonseByClose(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	payload := []byte("GET / HTTP/1.1\r\n\r\n")
+	ln, _ := net.Listen("tcp", ":0")
+	go func() {
+		for {
+			conn, _ := ln.Accept()
+			buf := make([]byte, 4096)
+			conn.Read(buf)
+
+			conn.Write([]byte("HTTP/1.1 200 OK\r\n\r\n"))
+			conn.Write([]byte("ab"))
+			conn.Close()
+
+			wg.Done()
+		}
+	}()
+
+	client := NewHTTPClient(ln.Addr().String(), &HTTPClientConfig{Debug: true})
+
+	wg.Add(1)
+	resp, _ := client.Send(payload)
+
+	if !bytes.Equal(resp, []byte("HTTP/1.1 200 OK\r\n\r\nab")) {
+		t.Error("Should return valid response", string(resp))
+	}
+
+	wg.Wait()
+}
+
+// https://github.com/buger/gor/issues/184
+func TestHTTPClientResponseBuffer(t *testing.T) {
+	testCases := []struct {
+		name         string
+		responseSize int
+		buffserSize  int
+		expectedSize int
+		timeout      time.Duration
+	}{
+		{"Chunked, buffer overflow", 10 * 1024, 1024, 1024, 50 * time.Millisecond},
+
+		{"Chunked, fits buffer", 10 * 1024, 64 * 1024, 10*1024 + 145 /* headers length + chunked meta */, 50 * time.Millisecond},
+
+		{"Content-Length, buffer overflow", 1024, 1000, 1000, 50 * time.Millisecond},
+
+		{"Content-Length, fits buffer", 1024, 64 * 1024, 1024 + 118, 50 * time.Millisecond},
+	}
+
+	for _, tc := range testCases {
+		wg := new(sync.WaitGroup)
+
+		payload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+		server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+			size := tc.responseSize // 1kb
+			rb := make([]byte, size)
+			rand.Read(rb)
+
+			w.Write(rb[:size/2])
+			w.Write(rb[size/2:])
+
+			wg.Done()
+		}))
+
+		client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true, ResponseBufferSize: tc.buffserSize, Timeout: 100 * time.Millisecond})
+
+		wg.Add(2)
+
+		start := time.Now()
+		client.Send(payload)
+		resp, err := client.Send(payload)
+		stop := time.Now()
+
+		if err != nil {
+			t.Error("Request error", err)
+		}
+
+		if stop.Sub(start) > tc.timeout {
+			t.Error("Request took too long", stop.Sub(start), tc.timeout)
+		}
+
+		if len(resp) != tc.expectedSize {
+			t.Error(tc.name, " - Wrong response size:", tc.expectedSize, len(resp))
+		} else {
+			if !bytes.Equal(resp[0:8], []byte("HTTP/1.1")) {
+				t.Error(tc.name, " - Response buffer contains data from previous request", string(resp), len(resp))
+			}
+		}
+
+		wg.Wait()
+		server.Close()
+	}
+}
+
+func TestHTTPClientHTTPSSend(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	payload := func(reqType string) []byte {
+		switch reqType {
+		case "GET":
+			return []byte("GET / HTTP/1.1\r\n\r\n")
+		case "POST":
+			return []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+		case "POST_CHUNKED":
+			return []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
+		}
+
+		return []byte("")
+	}
+
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		if r.Method == "POST" {
+			defer r.Body.Close()
+			body, _ := ioutil.ReadAll(r.Body)
+
+			if len(r.TransferEncoding) > 0 && r.TransferEncoding[0] == "chunked" {
+				if string(body) != "Wikipedia in\r\n\r\nchunks." {
+					t.Error("Wrong POST body:", body, string(body))
+				}
+			} else {
+				if string(body) != "a=1&b=2" {
+					buf, _ := httputil.DumpRequest(r, true)
+					t.Error("Wrong POST body:", string(body), string(buf))
+				}
+			}
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{})
+
+	wg.Add(4)
+	client.Send(payload("POST"))
+	client.Send(payload("GET"))
+	client.Send(payload("POST_CHUNKED"))
+	client.Send(payload("POST"))
+
+	wg.Wait()
+}
+
+func TestHTTPClientServerInstantDisconnect(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+	ln, _ := net.Listen("tcp", "127.0.0.1:0")
+	defer ln.Close()
+
+	go func() {
+		for {
+			conn, err := ln.Accept()
+
+			if err != nil {
+				break
+			}
+			conn.Close()
+			wg.Done()
+		}
+	}()
+
+	client := NewHTTPClient(ln.Addr().String(), &HTTPClientConfig{})
+
+	wg.Add(2)
+	client.Send(GETPayload)
+	client.Send(GETPayload)
+
+	wg.Wait()
+}
+
+func TestHTTPClientServerNoKeepAlive(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+	ln, _ := net.Listen("tcp", "127.0.0.1:0")
+	defer ln.Close()
+
+	go func() {
+		for {
+			conn, err := ln.Accept()
+			if err != nil {
+				break
+			}
+
+			buf := make([]byte, 4096)
+			reqLen, err := conn.Read(buf)
+			if err != nil {
+				t.Error("Error reading:", err.Error())
+			}
+			Debug("Received: ", string(buf[0:reqLen]))
+			conn.Write([]byte("OK"))
+
+			// No keep-alive connections
+			conn.Close()
+
+			wg.Done()
+		}
+	}()
+
+	client := NewHTTPClient(ln.Addr().String(), &HTTPClientConfig{})
+
+	wg.Add(2)
+	client.Send(GETPayload)
+	client.Send(GETPayload)
+
+	wg.Wait()
+}
+
+func TestHTTPClientRedirect(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		if r.URL.Path == "/" {
+			http.Redirect(w, r, "/new", 301)
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{FollowRedirects: 1, Debug: false})
+
+	// Should do 2 queries
+	wg.Add(2)
+	client.Send(GETPayload)
+
+	wg.Wait()
+}
+
+func TestHTTPClientRedirectLimit(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		if r.URL.Path == "/" {
+			http.Redirect(w, r, "/r1", 301)
+		}
+
+		if r.URL.Path == "/r1" {
+			http.Redirect(w, r, "/r2", 301)
+		}
+
+		if r.URL.Path == "/r2" {
+			http.Redirect(w, r, "/new", 301)
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{FollowRedirects: 2, Debug: false})
+
+	// Have 3 redirects + 1 GET, but should do only 2 redirects + GET
+	wg.Add(3)
+	client.Send(GETPayload)
+
+	wg.Wait()
+}
+
+func TestHTTPClientBasicAuth(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	wg.Add(2)
+
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		user, pass, _ := r.BasicAuth()
+
+		if user != "user" || pass != "pass" {
+			http.Error(w, "Unauthorized.", 401)
+			wg.Done()
+			return
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: false})
+	resp, _ := client.Send(GETPayload)
+	client.Disconnect()
+
+	if !bytes.Equal(proto.Status(resp), []byte("401")) {
+		t.Error("Should return unauthorized error", string(resp))
+	}
+
+	authUrl := strings.Replace(server.URL, "http://", "http://user:pass@", -1)
+	client = NewHTTPClient(authUrl, &HTTPClientConfig{Debug: false})
+	resp, _ = client.Send(GETPayload)
+	client.Disconnect()
+
+	if !bytes.Equal(proto.Status(resp), []byte("200")) {
+		t.Error("Should return proper response", string(resp))
+	}
+
+	wg.Wait()
+}
+
+func TestHTTPClientHandleHTTP10(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	GETPayload := []byte("GET http://foobar.com/path HTTP/1.0\r\n\r\n")
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		if r.URL.Path != "/path" {
+			t.Error("Path not match:", r.URL.Path)
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true})
+
+	wg.Add(1)
+	client.Send(GETPayload)
+
+	wg.Wait()
+}
+
+func TestHTTPClientErrors(t *testing.T) {
+	req := []byte("GET http://foobar.com/path HTTP/1.0\r\n\r\n")
+
+	// Port not exists
+	client := NewHTTPClient("http://127.0.0.1:1", &HTTPClientConfig{Debug: true})
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("521")) {
+			t.Error("Should return status 521 for connection refused, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	client = NewHTTPClient("http://not.existing", &HTTPClientConfig{Debug: true})
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("521")) {
+			t.Error("Should return status 521 for no such host, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	// Non routable IP address to simulate connection timeout
+	client = NewHTTPClient("http://10.255.255.1", &HTTPClientConfig{Debug: true, ConnectionTimeout: 100 * time.Millisecond})
+
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("521")) {
+			t.Error("Should return status 521 for io/timeout:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	// Connecting but io timeout on read
+	ln, _ := net.Listen("tcp", "127.0.0.1:0")
+	client = NewHTTPClient("http://"+ln.Addr().String(), &HTTPClientConfig{Debug: true, Timeout: 10 * time.Millisecond})
+	defer ln.Close()
+
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("524")) {
+			t.Error("Should return status 524 for io read, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	// Response read error read tcp [::1]:51128: connection reset by peer &{{0xc20802a000}}
+	ln1, _ := net.Listen("tcp", "127.0.0.1:0")
+	go func() {
+		ln1.Accept()
+	}()
+	defer ln1.Close()
+
+	client = NewHTTPClient("http://"+ln1.Addr().String(), &HTTPClientConfig{Debug: true, Timeout: 10 * time.Millisecond})
+
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("524")) {
+			t.Error("Should return status 524 for connection reset by peer, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+}

http_modifier.go

@@ -0,0 +1,157 @@
+package main
+
+import (
+	"bytes"
+	"hash/fnv"
+
+	"github.com/buger/gor/proto"
+)
+
+type HTTPModifier struct {
+	config *HTTPModifierConfig
+}
+
+func NewHTTPModifier(config *HTTPModifierConfig) *HTTPModifier {
+	// Optimization to skip modifier completely if we do not need it
+	if len(config.urlRegexp) == 0 &&
+		len(config.urlNegativeRegexp) == 0 &&
+		len(config.urlRewrite) == 0 &&
+		len(config.headerFilters) == 0 &&
+		len(config.headerNegativeFilters) == 0 &&
+		len(config.headerHashFilters) == 0 &&
+		len(config.paramHashFilters) == 0 &&
+		len(config.params) == 0 &&
+		len(config.headers) == 0 &&
+		len(config.methods) == 0 {
+		return nil
+	}
+
+	return &HTTPModifier{config: config}
+}
+
+func (m *HTTPModifier) Rewrite(payload []byte) (response []byte) {
+	if !proto.IsHTTPPayload(payload) {
+		return payload
+	}
+
+	if len(m.config.methods) > 0 {
+		method := proto.Method(payload)
+
+		matched := false
+
+		for _, m := range m.config.methods {
+			if bytes.Equal(method, m) {
+				matched = true
+				break
+			}
+		}
+
+		if !matched {
+			return
+		}
+	}
+
+	if len(m.config.headers) > 0 {
+		for _, header := range m.config.headers {
+			payload = proto.SetHeader(payload, []byte(header.Name), []byte(header.Value))
+		}
+	}
+
+	if len(m.config.params) > 0 {
+		for _, param := range m.config.params {
+			payload = proto.SetPathParam(payload, param.Name, param.Value)
+		}
+	}
+
+	if len(m.config.urlRegexp) > 0 {
+		path := proto.Path(payload)
+
+		matched := false
+
+		for _, f := range m.config.urlRegexp {
+			if f.regexp.Match(path) {
+				matched = true
+				break
+			}
+		}
+
+		if !matched {
+			return
+		}
+	}
+
+	if len(m.config.urlNegativeRegexp) > 0 {
+		path := proto.Path(payload)
+
+		for _, f := range m.config.urlNegativeRegexp {
+			if f.regexp.Match(path) {
+				return
+			}
+		}
+	}
+
+	if len(m.config.headerFilters) > 0 {
+		for _, f := range m.config.headerFilters {
+			value := proto.Header(payload, f.name)
+
+			if len(value) > 0 && !f.regexp.Match(value) {
+				return
+			}
+		}
+	}
+
+	if len(m.config.headerNegativeFilters) > 0 {
+		for _, f := range m.config.headerNegativeFilters {
+			value := proto.Header(payload, f.name)
+
+			if len(value) > 0 && f.regexp.Match(value) {
+				return
+			}
+		}
+	}
+
+	if len(m.config.headerHashFilters) > 0 {
+		for _, f := range m.config.headerHashFilters {
+			value := proto.Header(payload, f.name)
+
+			if len(value) > 0 {
+				hasher := fnv.New32a()
+				hasher.Write(value)
+
+				if (hasher.Sum32() % 100) >= f.percent {
+					return
+				}
+			}
+		}
+	}
+
+	if len(m.config.paramHashFilters) > 0 {
+		for _, f := range m.config.paramHashFilters {
+			value, s, _ := proto.PathParam(payload, f.name)
+
+			if s != -1 {
+				hasher := fnv.New32a()
+				hasher.Write(value)
+
+				if (hasher.Sum32() % 100) >= f.percent {
+					return
+				}
+			}
+		}
+	}
+
+	if len(m.config.urlRewrite) > 0 {
+		path := proto.Path(payload)
+
+		for _, f := range m.config.urlRewrite {
+			if f.src.Match(path) {
+				path = f.src.ReplaceAll(path, f.target)
+				payload = proto.SetPath(payload, path)
+
+				break
+			}
+		}
+	}
+
+	return payload
+}

http_modifier_settings.go

@@ -0,0 +1,218 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// HTTPModifierConfig holds configuration options for built-in traffic modifier
+type HTTPModifierConfig struct {
+	urlNegativeRegexp     HTTPUrlRegexp
+	urlRegexp             HTTPUrlRegexp
+	urlRewrite            UrlRewriteMap
+	headerFilters         HTTPHeaderFilters
+	headerNegativeFilters HTTPHeaderFilters
+	headerHashFilters     HTTPHashFilters
+	paramHashFilters      HTTPHashFilters
+
+	params  HTTPParams
+	headers HTTPHeaders
+	methods HTTPMethods
+}
+
+//
+// Handling of --http-allow-header, --http-disallow-header options
+//
+type headerFilter struct {
+	name   []byte
+	regexp *regexp.Regexp
+}
+
+// HTTPHeaderFilters holds list of headers and their regexps
+type HTTPHeaderFilters []headerFilter
+
+func (h *HTTPHeaderFilters) String() string {
+	return fmt.Sprint(*h)
+}
+
+func (h *HTTPHeaderFilters) Set(value string) error {
+	valArr := strings.SplitN(value, ":", 2)
+	if len(valArr) < 2 {
+		return errors.New("need both header and value, colon-delimited (ex. user_id:^169$).")
+	}
+	val := strings.TrimSpace(valArr[1])
+	r, err := regexp.Compile(val)
+	if err != nil {
+		return err
+	}
+
+	*h = append(*h, headerFilter{name: []byte(valArr[0]), regexp: r})
+
+	return nil
+}
+
+//
+// Handling of --http-allow-header-hash and --http-allow-param-hash options
+//
+type hashFilter struct {
+	name    []byte
+	percent uint32
+}
+
+type HTTPHashFilters []hashFilter
+
+func (h *HTTPHashFilters) String() string {
+	return fmt.Sprint(*h)
+}
+
+func (h *HTTPHashFilters) Set(value string) error {
+	valArr := strings.SplitN(value, ":", 2)
+	if len(valArr) < 2 {
+		return errors.New("need both header and value, colon-delimited (ex. user_id:50%)")
+	}
+
+	f := hashFilter{name: []byte(valArr[0])}
+
+	val := strings.TrimSpace(valArr[1])
+
+	if strings.Contains(val, "%") {
+		p, _ := strconv.ParseInt(val[:len(val)-1], 0, 0)
+		f.percent = uint32(p)
+	} else if strings.Contains(val, "/") {
+		// DEPRECATED format
+		var num, den uint64
+
+		fracArr := strings.Split(val, "/")
+		num, _ = strconv.ParseUint(fracArr[0], 10, 64)
+		den, _ = strconv.ParseUint(fracArr[1], 10, 64)
+
+		f.percent = uint32((float64(num) / float64(den)) * 100)
+	} else {
+		return errors.New("Value should be percent and contain '%'")
+	}
+
+	*h = append(*h, f)
+
+	return nil
+}
+
+//
+// Handling of --http-set-header option
+//
+type HTTPHeaders []HTTPHeader
+type HTTPHeader struct {
+	Name  string
+	Value string
+}
+
+func (h *HTTPHeaders) String() string {
+	return fmt.Sprint(*h)
+}
+
+func (h *HTTPHeaders) Set(value string) error {
+	v := strings.SplitN(value, ":", 2)
+	if len(v) != 2 {
+		return errors.New("Expected `Key: Value`")
+	}
+
+	header := HTTPHeader{
+		strings.TrimSpace(v[0]),
+		strings.TrimSpace(v[1]),
+	}
+
+	*h = append(*h, header)
+	return nil
+}
+
+//
+// Handling of --http-set-param option
+//
+type HTTPParams []HTTPParam
+type HTTPParam struct {
+	Name  []byte
+	Value []byte
+}
+
+func (h *HTTPParams) String() string {
+	return fmt.Sprint(*h)
+}
+
+func (h *HTTPParams) Set(value string) error {
+	v := strings.SplitN(value, "=", 2)
+	if len(v) != 2 {
+		return errors.New("Expected `Key=Value`")
+	}
+
+	param := HTTPParam{
+		[]byte(strings.TrimSpace(v[0])),
+		[]byte(strings.TrimSpace(v[1])),
+	}
+
+	*h = append(*h, param)
+	return nil
+}
+
+//
+// Handling of --http-allow-method option
+//
+type HTTPMethods [][]byte
+
+func (h *HTTPMethods) String() string {
+	return fmt.Sprint(*h)
+}
+
+func (h *HTTPMethods) Set(value string) error {
+	*h = append(*h, []byte(value))
+	return nil
+}
+
+//
+// Handling of --http-rewrite-url option
+//
+type urlRewrite struct {
+	src    *regexp.Regexp
+	target []byte
+}
+
+type UrlRewriteMap []urlRewrite
+
+func (r *UrlRewriteMap) String() string {
+	return fmt.Sprint(*r)
+}
+
+func (r *UrlRewriteMap) Set(value string) error {
+	valArr := strings.SplitN(value, ":", 2)
+	if len(valArr) < 2 {
+		return errors.New("need both src and target, colon-delimited (ex. /a:/b)")
+	}
+	regexp, err := regexp.Compile(valArr[0])
+	if err != nil {
+		return err
+	}
+	*r = append(*r, urlRewrite{src: regexp, target: []byte(valArr[1])})
+	return nil
+}
+
+//
+// Handling of --http-allow-url option
+//
+type urlRegexp struct {
+	regexp *regexp.Regexp
+}
+
+type HTTPUrlRegexp []urlRegexp
+
+func (r *HTTPUrlRegexp) String() string {
+	return fmt.Sprint(*r)
+}
+
+func (r *HTTPUrlRegexp) Set(value string) error {
+	regexp, err := regexp.Compile(value)
+
+	*r = append(*r, urlRegexp{regexp: regexp})
+
+	return err
+}

http_modifier_settings_test.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestHTTPHeaderFilters(t *testing.T) {
+	filters := HTTPHeaderFilters{}
+
+	err := filters.Set("Header1:^$")
+	if err != nil {
+		t.Error("Should not error on Header1:^$")
+	}
+
+	err = filters.Set("Header2:^:$")
+	if err != nil {
+		t.Error("Should not error on Header2:^:$")
+	}
+
+	// Missing colon
+	err = filters.Set("Header3-^$")
+	if err == nil {
+		t.Error("Should error on Header2:^:$")
+	}
+}
+
+func TestHTTPHashFilters(t *testing.T) {
+	filters := HTTPHashFilters{}
+
+	err := filters.Set("Header1:1/2")
+	if err != nil {
+		t.Error("Should support old syntax")
+	}
+
+	if filters[0].percent != 50 {
+		t.Error("Wrong percentage", filters[0].percent)
+	}
+
+	err = filters.Set("Header2:1")
+	if err == nil {
+		t.Error("Should error on Header2 because no % symbol")
+	}
+
+	err = filters.Set("Header2:10%")
+	if err != nil {
+		t.Error("Should pass")
+	}
+
+	if filters[1].percent != 10 {
+		t.Error("Wrong percentage", filters[1].percent)
+	}
+}
+
+func TestUrlRewriteMap(t *testing.T) {
+	var err error
+	rewrites := UrlRewriteMap{}
+
+	if err = rewrites.Set("/v1/user/([^\\/]+)/ping:/v2/user/$1/ping"); err != nil {
+		t.Error("Should set mapping", err)
+	}
+
+	if err = rewrites.Set("/v1/user/([^\\/]+)/ping"); err == nil {
+		t.Error("Should not set mapping without :")
+	}
+}

http_modifier_test.go

@@ -0,0 +1,259 @@
+package main
+
+import (
+	"bytes"
+	"github.com/buger/gor/proto"
+	"testing"
+)
+
+func TestHTTPModifierWithoutConfig(t *testing.T) {
+	if NewHTTPModifier(&HTTPModifierConfig{}) != nil {
+		t.Error("If no config specified should not be initialized")
+	}
+}
+
+func TestHTTPModifierHeaderFilters(t *testing.T) {
+	filters := HTTPHeaderFilters{}
+	filters.Set("Host:^www.w3.org$")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		headerFilters: filters,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if len(modifier.Rewrite(payload)) == 0 {
+		t.Error("Request should pass filters")
+	}
+
+	filters = HTTPHeaderFilters{}
+	// Setting filter that not match our header
+	filters.Set("Host:^www.w4.org$")
+
+	modifier = NewHTTPModifier(&HTTPModifierConfig{
+		headerFilters: filters,
+	})
+
+	if len(modifier.Rewrite(payload)) != 0 {
+		t.Error("Request should not pass filters")
+	}
+}
+
+func TestHTTPModifierHeaderNegativeFilters(t *testing.T) {
+	filters := HTTPHeaderFilters{}
+	filters.Set("Host:^www.w3.org$")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		headerNegativeFilters: filters,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w4.org\r\n\r\na=1&b=2")
+
+	if len(modifier.Rewrite(payload)) == 0 {
+		t.Error("Request should pass filters")
+	}
+
+	filters = HTTPHeaderFilters{}
+	// Setting filter that not match our header
+	filters.Set("Host:^www.w4.org$")
+
+	modifier = NewHTTPModifier(&HTTPModifierConfig{
+		headerNegativeFilters: filters,
+	})
+
+	if len(modifier.Rewrite(payload)) != 0 {
+		t.Error("Request should not pass filters")
+	}
+
+	filters = HTTPHeaderFilters{}
+	// Setting filter that not match our header
+	filters.Set("Host: www*")
+
+	modifier = NewHTTPModifier(&HTTPModifierConfig{
+		headerNegativeFilters: filters,
+	})
+
+	if len(modifier.Rewrite(payload)) != 0 {
+		t.Error("Request should not pass filters")
+	}
+}
+
+func TestHTTPModifierURLRewrite(t *testing.T) {
+	var url, newURL []byte
+
+	rewrites := UrlRewriteMap{}
+
+	payload := func(url []byte) []byte {
+		return []byte("POST " + string(url) + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	err := rewrites.Set("/v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
+	if err != nil {
+		t.Error("Should not error on /v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
+	}
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		urlRewrite: rewrites,
+	})
+
+	url = []byte("/v1/user/joe/ping")
+	if newURL = proto.Path(modifier.Rewrite(payload(url))); bytes.Equal(newURL, url) {
+		t.Error("Request url should have been rewritten, wasn't", string(newURL))
+	}
+
+	url = []byte("/v1/user/ping")
+	if newURL = proto.Path(modifier.Rewrite(payload(url))); !bytes.Equal(newURL, url) {
+		t.Error("Request url should have been rewritten, wasn't", string(newURL))
+	}
+}
+
+func TestHTTPModifierHeaderHashFilters(t *testing.T) {
+	filters := HTTPHashFilters{}
+	filters.Set("Header2:1/2")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		headerHashFilters: filters,
+	})
+
+	payload := func(header []byte) []byte {
+		return []byte("POST / HTTP/1.1\r\n" + string(header) + "Content-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if p := modifier.Rewrite(payload([]byte(""))); len(p) == 0 {
+		t.Error("Request should pass filters if Header does not exist")
+	}
+
+	if p := modifier.Rewrite(payload([]byte("Header2: 3\r\n"))); len(p) > 0 {
+		t.Error("Request should not pass filters, Header2 hash too high")
+	}
+
+	if p := modifier.Rewrite(payload([]byte("Header2: 1\r\n"))); len(p) == 0 {
+		t.Error("Request should pass filters")
+	}
+}
+
+func TestHTTPModifierParamHashFilters(t *testing.T) {
+	filters := HTTPHashFilters{}
+	filters.Set("user_id:1/2")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		paramHashFilters: filters,
+	})
+
+	payload := func(value []byte) []byte {
+		return []byte("POST /" + string(value) + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if p := modifier.Rewrite(payload([]byte(""))); len(p) == 0 {
+		t.Error("Request should pass filters if param does not exist")
+	}
+
+	if p := modifier.Rewrite(payload([]byte("?user_id=3"))); len(p) > 0 {
+		t.Error("Request should not pass filters", string(p))
+	}
+
+	if p := modifier.Rewrite(payload([]byte("?user_id=1"))); len(p) == 0 {
+		t.Error("Request should pass filters")
+	}
+}
+
+func TestHTTPModifierHeaders(t *testing.T) {
+	headers := HTTPHeaders{}
+	headers.Set("Header1:1")
+	headers.Set("Host:localhost")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		headers: headers,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	newPayload := []byte("POST /post HTTP/1.1\r\nHeader1: 1\r\nContent-Length: 7\r\nHost: localhost\r\n\r\na=1&b=2")
+
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payload, newPayload) {
+		t.Error("Should update request headers", string(payload))
+	}
+}
+
+func TestHTTPModifierURLRegexp(t *testing.T) {
+	filters := HTTPUrlRegexp{}
+	filters.Set("/v1/app")
+	filters.Set("/v1/api")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		urlRegexp: filters,
+	})
+
+	payload := func(url string) []byte {
+		return []byte("POST " + url + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if len(modifier.Rewrite(payload("/v1/app/test"))) == 0 {
+		t.Error("Should pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/v1/api/test"))) == 0 {
+		t.Error("Should pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/other"))) > 0 {
+		t.Error("Should not pass url")
+	}
+}
+
+func TestHTTPModifierURLNegativeRegexp(t *testing.T) {
+	filters := HTTPUrlRegexp{}
+	filters.Set("/restricted1")
+	filters.Set("/some/restricted2")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		urlNegativeRegexp: filters,
+	})
+
+	payload := func(url string) []byte {
+		return []byte("POST " + url + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if len(modifier.Rewrite(payload("/v1/app/test"))) == 0 {
+		t.Error("Should pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/restricted1"))) > 0 {
+		t.Error("Should not pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/some/restricted2"))) > 0 {
+		t.Error("Should not pass url")
+	}
+}
+
+func TestHTTPModifierSetHeader(t *testing.T) {
+	filters := HTTPHeaders{}
+	filters.Set("User-Agent:Gor")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		headers: filters,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter := []byte("POST /post HTTP/1.1\r\nUser-Agent: Gor\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payloadAfter, payload) {
+		t.Error("Should add new header", string(payload))
+	}
+}
+
+func TestHTTPModifierSetParam(t *testing.T) {
+	filters := HTTPParams{}
+	filters.Set("api_key=1")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		params: filters,
+	})
+
+	payload := []byte("POST /post?api_key=1234 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter := []byte("POST /post?api_key=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payloadAfter, payload) {
+		t.Error("Should override param", string(payload))
+	}
+}

input_dummy.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"time"
+)
+
+// DummyInput used for debugging. It generate 1 "GET /"" request per second.
+type DummyInput struct {
+	data chan []byte
+}
+
+// NewDummyInput constructor for DummyInput
+func NewDummyInput(options string) (di *DummyInput) {
+	di = new(DummyInput)
+	di.data = make(chan []byte)
+
+	go di.emit()
+
+	return
+}
+
+func (i *DummyInput) Read(data []byte) (int, error) {
+	buf := <-i.data
+
+	copy(data, buf)
+
+	return len(buf), nil
+}
+
+func (i *DummyInput) emit() {
+	ticker := time.NewTicker(time.Second)
+
+	for {
+		select {
+		case <-ticker.C:
+			uuid := uuid()
+			reqh := payloadHeader(RequestPayload, uuid, time.Now().UnixNano(), -1)
+			i.data <- append(reqh, []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+			resh := payloadHeader(ResponsePayload, uuid, time.Now().UnixNano()+1, 1)
+			i.data <- append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
+		}
+	}
+}
+
+func (i *DummyInput) String() string {
+	return "Dummy Input"
+}

input_file.go

@@ -0,0 +1,238 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"compress/gzip"
+	"errors"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+type fileInputReader struct {
+	reader    *bufio.Reader
+	data      []byte
+	file      *os.File
+	timestamp int64
+}
+
+func (f *fileInputReader) parseNext() error {
+	payloadSeparatorAsBytes := []byte(payloadSeparator)
+	var buffer bytes.Buffer
+
+	for {
+		line, err := f.reader.ReadBytes('\n')
+
+		if err != nil {
+			if err != io.EOF {
+				log.Println(err)
+				return err
+			}
+
+			if err == io.EOF {
+				f.file.Close()
+				f.file = nil
+				return err
+			}
+		}
+
+		if bytes.Equal(payloadSeparatorAsBytes[1:], line) {
+			asBytes := buffer.Bytes()
+			meta := payloadMeta(asBytes)
+
+			f.timestamp, _ = strconv.ParseInt(string(meta[2]), 10, 64)
+			f.data = asBytes[:len(asBytes)-1]
+
+			return nil
+		}
+
+		buffer.Write(line)
+	}
+
+	return nil
+}
+
+func (f *fileInputReader) ReadPayload() []byte {
+	defer f.parseNext()
+
+	return f.data
+}
+func (f *fileInputReader) Close() error {
+	if f.file != nil {
+		f.file.Close()
+	}
+
+	return nil
+}
+
+func NewFileInputReader(path string) *fileInputReader {
+	file, err := os.Open(path)
+
+	if err != nil {
+		log.Println(err)
+		return nil
+	}
+
+	r := &fileInputReader{file: file}
+	if strings.HasSuffix(path, ".gz") {
+		gzReader, err := gzip.NewReader(file)
+		if err != nil {
+			log.Println(err)
+			return nil
+		}
+		r.reader = bufio.NewReader(gzReader)
+	} else {
+		r.reader = bufio.NewReader(file)
+	}
+
+	r.parseNext()
+
+	return r
+}
+
+// FileInput can read requests generated by FileOutput
+type FileInput struct {
+	mu          sync.Mutex
+	data        chan []byte
+	exit        chan bool
+	path        string
+	readers     []*fileInputReader
+	speedFactor float64
+	loop        bool
+}
+
+// NewFileInput constructor for FileInput. Accepts file path as argument.
+func NewFileInput(path string, loop bool) (i *FileInput) {
+	i = new(FileInput)
+	i.data = make(chan []byte, 1000)
+	i.exit = make(chan bool, 1)
+	i.path = path
+	i.speedFactor = 1
+	i.loop = loop
+
+	if err := i.init(); err != nil {
+		return
+	}
+
+	go i.emit()
+
+	return
+}
+
+type NextFileNotFound struct{}
+
+func (_ *NextFileNotFound) Error() string {
+	return "There is no new files"
+}
+
+func (i *FileInput) init() (err error) {
+	defer i.mu.Unlock()
+	i.mu.Lock()
+
+	var matches []string
+
+	if matches, err = filepath.Glob(i.path); err != nil {
+		log.Println("Wrong file pattern", i.path, err)
+		return
+	}
+
+	if len(matches) == 0 {
+		log.Println("No files match pattern: ", i.path)
+		return errors.New("No matching files")
+	}
+
+	i.readers = make([]*fileInputReader, len(matches))
+
+	for idx, p := range matches {
+		i.readers[idx] = NewFileInputReader(p)
+	}
+
+	return nil
+}
+
+func (i *FileInput) Read(data []byte) (int, error) {
+	buf := <-i.data
+	copy(data, buf)
+
+	return len(buf), nil
+}
+
+func (i *FileInput) String() string {
+	return "File input: " + i.path
+}
+
+// Find reader with smallest timestamp e.g next payload in row
+func (i *FileInput) nextReader() (next *fileInputReader) {
+	for _, r := range i.readers {
+		if r == nil || r.file == nil {
+			continue
+		}
+
+		if next == nil || r.timestamp < next.timestamp {
+			next = r
+			continue
+		}
+	}
+
+	return
+}
+
+func (i *FileInput) emit() {
+	var lastTime int64 = -1
+
+	for {
+		select {
+		case <-i.exit:
+			return
+		default:
+		}
+
+		reader := i.nextReader()
+
+		if reader == nil {
+			if i.loop {
+				i.init()
+				lastTime = -1
+				continue
+			} else {
+				break
+			}
+		}
+
+		if lastTime != -1 {
+			diff := reader.timestamp - lastTime
+			lastTime = reader.timestamp
+
+			if i.speedFactor != 1 {
+				diff = int64(float64(diff) / i.speedFactor)
+			}
+
+			time.Sleep(time.Duration(diff))
+		} else {
+			lastTime = reader.timestamp
+		}
+
+		i.data <- reader.ReadPayload()
+	}
+
+	log.Printf("FileInput: end of file '%s'\n", i.path)
+}
+
+func (i *FileInput) Close() error {
+	defer i.mu.Unlock()
+	i.mu.Lock()
+
+	i.exit <- true
+
+	for _, r := range i.readers {
+		r.Close()
+	}
+
+	return nil
+}

input_file_test.go

@@ -0,0 +1,382 @@
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"os"
+	"sync"
+	"syscall"
+	"testing"
+	"time"
+)
+
+var _ = log.Println
+
+func TestInputFileWithGET(t *testing.T) {
+
+	input := NewTestInput()
+	rg := NewRequestGenerator([]io.Reader{input}, func() { input.EmitGET() }, 1)
+	readPayloads := [][]byte{}
+
+	// Given a capture file with a GET request
+	expectedCaptureFile := CreateCaptureFile(rg)
+	defer expectedCaptureFile.TearDown()
+
+	// When the request is read from the capture file
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+	})
+
+	// The read request should match the original request
+	if err != nil {
+		t.Error(err)
+	} else {
+		if !expectedCaptureFile.PayloadsEqual(readPayloads) {
+			t.Error("Request read back from file should match")
+		}
+	}
+}
+
+func TestInputFileWithPayloadLargerThan64Kb(t *testing.T) {
+
+	input := NewTestInput()
+	rg := NewRequestGenerator([]io.Reader{input}, func() { input.EmitSizedPOST(64 * 1024) }, 1)
+	readPayloads := [][]byte{}
+
+	// Given a capture file with a request over 64Kb
+	expectedCaptureFile := CreateCaptureFile(rg)
+	defer expectedCaptureFile.TearDown()
+
+	// When the request is read from the capture file
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+	})
+
+	// The read request should match the original request
+	if err != nil {
+		t.Error(err)
+	} else {
+		if !expectedCaptureFile.PayloadsEqual(readPayloads) {
+			t.Error("Request read back from file should match")
+		}
+	}
+
+}
+
+func TestInputFileWithGETAndPOST(t *testing.T) {
+
+	input := NewTestInput()
+	rg := NewRequestGenerator([]io.Reader{input}, func() {
+		input.EmitGET()
+		input.EmitPOST()
+	}, 2)
+	readPayloads := [][]byte{}
+
+	// Given a capture file with a GET request
+	expectedCaptureFile := CreateCaptureFile(rg)
+	defer expectedCaptureFile.TearDown()
+
+	// When the requests are read from the capture file
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 2, func(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+	})
+
+	// The read requests should match the original request
+	if err != nil {
+		t.Error(err)
+	} else {
+		if !expectedCaptureFile.PayloadsEqual(readPayloads) {
+			t.Error("Request read back from file should match")
+		}
+	}
+
+}
+
+func TestInputFileMultipleFilesWithRequestsOnly(t *testing.T) {
+	rnd := rand.Int63()
+
+	file1, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_0", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file1.Write([]byte("1 1 1\ntest1"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("1 1 3\ntest2"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Close()
+
+	file2, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_1", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file2.Write([]byte("1 1 2\ntest3"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("1 1 4\ntest4"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false)
+	buf := make([]byte, 1000)
+
+	for i := '1'; i <= '4'; i++ {
+		n, _ := input.Read(buf)
+		if buf[4] != byte(i) {
+			t.Error("Should emit requests in right order", string(buf[:n]))
+		}
+	}
+
+	os.Remove(file1.Name())
+	os.Remove(file2.Name())
+}
+
+func TestInputFileRequestsWithLatency(t *testing.T) {
+	rnd := rand.Int63()
+
+	file, _ := os.OpenFile(fmt.Sprintf("/tmp/%d", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	defer file.Close()
+
+	file.Write([]byte("1 1 100000000\nrequest1"))
+	file.Write([]byte(payloadSeparator))
+	file.Write([]byte("1 2 150000000\nrequest2"))
+	file.Write([]byte(payloadSeparator))
+	file.Write([]byte("1 3 250000000\nrequest3"))
+	file.Write([]byte(payloadSeparator))
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d", rnd), false)
+	buf := make([]byte, 1000)
+
+	start := time.Now().UnixNano()
+	for i := 0; i < 3; i++ {
+		input.Read(buf)
+	}
+	end := time.Now().UnixNano()
+
+	var expectedLatency int64 = 250000000 - 100000000
+	realLatency := end - start
+	if realLatency < expectedLatency {
+		t.Errorf("Should emit requests respecting latency. Expected: %v, real: %v", expectedLatency, realLatency)
+	}
+
+	if realLatency > expectedLatency+10000000 {
+		t.Errorf("Should emit requests respecting latency. Expected: %v, real: %v", expectedLatency, realLatency)
+
+	}
+}
+
+func TestInputFileMultipleFilesWithRequestsAndResponses(t *testing.T) {
+	rnd := rand.Int63()
+
+	file1, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_0", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file1.Write([]byte("1 1 1\nrequest1"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("2 1 1\nresponse1"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("1 2 3\nrequest2"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("2 2 3\nresponse2"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Close()
+
+	file2, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_1", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file2.Write([]byte("1 3 2\nrequest3"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("2 3 2\nresponse3"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("1 4 4\nrequest4"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("2 4 4\nresponse4"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false)
+	buf := make([]byte, 1000)
+
+	for i := '1'; i <= '4'; i++ {
+		n, _ := input.Read(buf)
+		if buf[0] != '1' && buf[4] != byte(i) {
+			t.Error("Shound emit requests in right order", string(buf[:n]))
+		}
+
+		n, _ = input.Read(buf)
+		if buf[0] != '2' && buf[4] != byte(i) {
+			t.Error("Shound emit responses in right order", string(buf[:n]))
+		}
+	}
+
+	os.Remove(file1.Name())
+	os.Remove(file2.Name())
+}
+
+func TestInputFileLoop(t *testing.T) {
+	rnd := rand.Int63()
+
+	file, _ := os.OpenFile(fmt.Sprintf("/tmp/%d", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file.Write([]byte("1 1 1\ntest1"))
+	file.Write([]byte(payloadSeparator))
+	file.Write([]byte("1 1 2\ntest2"))
+	file.Write([]byte(payloadSeparator))
+	file.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d", rnd), true)
+	buf := make([]byte, 1000)
+
+	// Even if we have just 2 requests in file, it should indifinitly loop
+	for i := 0; i < 1000; i++ {
+		input.Read(buf)
+	}
+
+	input.Close()
+	os.Remove(file.Name())
+}
+
+func TestInputFileCompressed(t *testing.T) {
+	rnd := rand.Int63()
+
+	output := NewFileOutput(fmt.Sprintf("/tmp/%d_0.gz", rnd), &FileOutputConfig{flushInterval: time.Minute, append: true})
+	for i := 0; i < 1000; i++ {
+		output.Write([]byte("1 1 1\r\ntest"))
+	}
+	name1 := output.file.Name()
+	output.Close()
+
+	output2 := NewFileOutput(fmt.Sprintf("/tmp/%d_1.gz", rnd), &FileOutputConfig{flushInterval: time.Minute, append: true})
+	for i := 0; i < 1000; i++ {
+		output2.Write([]byte("1 1 1\r\ntest"))
+	}
+	name2 := output2.file.Name()
+	output2.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false)
+	buf := make([]byte, 1000)
+	for i := 0; i < 2000; i++ {
+		input.Read(buf)
+	}
+
+	os.Remove(name1)
+	os.Remove(name2)
+}
+
+type CaptureFile struct {
+	data [][]byte
+	file *os.File
+}
+
+func NewExpectedCaptureFile(data [][]byte, file *os.File) *CaptureFile {
+	ecf := new(CaptureFile)
+	ecf.file = file
+	ecf.data = data
+	return ecf
+}
+
+func (expectedCaptureFile *CaptureFile) TearDown() {
+	if expectedCaptureFile.file != nil {
+		syscall.Unlink(expectedCaptureFile.file.Name())
+	}
+}
+
+type RequestGenerator struct {
+	inputs []io.Reader
+	emit   func()
+	wg     *sync.WaitGroup
+}
+
+func NewRequestGenerator(inputs []io.Reader, emit func(), count int) (rg *RequestGenerator) {
+	rg = new(RequestGenerator)
+	rg.inputs = inputs
+	rg.emit = emit
+	rg.wg = new(sync.WaitGroup)
+	rg.wg.Add(count)
+	return
+}
+
+func (expectedCaptureFile *CaptureFile) PayloadsEqual(other [][]byte) bool {
+
+	if len(expectedCaptureFile.data) != len(other) {
+		return false
+	}
+
+	for i, payload := range other {
+		if !bytes.Equal(expectedCaptureFile.data[i], payload) {
+			return false
+		}
+	}
+
+	return true
+
+}
+
+func CreateCaptureFile(requestGenerator *RequestGenerator) *CaptureFile {
+
+	f, err := ioutil.TempFile("", "testmainconf")
+	if err != nil {
+		panic(err)
+	}
+
+	quit := make(chan int)
+
+	readPayloads := [][]byte{}
+	output := NewTestOutput(func(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+
+		requestGenerator.wg.Done()
+	})
+
+	outputFile := NewFileOutput(f.Name(), &FileOutputConfig{flushInterval: time.Minute, append: true})
+
+	Plugins.Inputs = requestGenerator.inputs
+	Plugins.Outputs = []io.Writer{output, outputFile}
+
+	go Start(quit)
+
+	requestGenerator.emit()
+	requestGenerator.wg.Wait()
+
+	time.Sleep(100 * time.Millisecond)
+	outputFile.Close()
+
+	close(quit)
+
+	return NewExpectedCaptureFile(readPayloads, f)
+
+}
+
+func ReadFromCaptureFile(captureFile *os.File, count int, callback writeCallback) (err error) {
+
+	quit := make(chan int)
+	wg := new(sync.WaitGroup)
+
+	input := NewFileInput(captureFile.Name(), false)
+	output := NewTestOutput(func(data []byte) {
+		callback(data)
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	wg.Add(count)
+	go Start(quit)
+
+	done := make(chan int, 1)
+	go func() {
+		wg.Wait()
+		done <- 1
+	}()
+
+	select {
+	case <-done:
+		break
+	case <-time.After(2 * time.Second):
+		err = errors.New("Timed out")
+	}
+	close(quit)
+
+	return
+
+}
+
+func Duplicate(data []byte) (duplicate []byte) {
+	duplicate = make([]byte, len(data))
+	copy(duplicate, data)
+
+	return
+}

input_http.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"log"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"time"
+)
+
+// HTTPInput used for sending requests to Gor via http
+type HTTPInput struct {
+	data     chan []byte
+	address  string
+	listener net.Listener
+}
+
+// NewHTTPInput constructor for HTTPInput. Accepts address with port which he will listen on.
+func NewHTTPInput(address string) (i *HTTPInput) {
+	i = new(HTTPInput)
+	i.data = make(chan []byte, 10000)
+	i.address = address
+
+	i.listen(address)
+
+	return
+}
+
+func (i *HTTPInput) Read(data []byte) (int, error) {
+	buf := <-i.data
+
+	header := payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1)
+
+	copy(data[0:len(header)], header)
+	copy(data[len(header):], buf)
+
+	return len(buf) + len(header), nil
+}
+
+func (i *HTTPInput) handler(w http.ResponseWriter, r *http.Request) {
+	r.URL.Scheme = "http"
+	r.URL.Host = i.listener.Addr().String()
+
+	buf, _ := httputil.DumpRequestOut(r, true)
+	http.Error(w, http.StatusText(200), 200)
+
+	select {
+	case i.data <- buf:
+	default:
+		Debug("[INPUT-HTTP] Dropping requests because output can't process them fast enough")
+	}
+}
+
+func (i *HTTPInput) listen(address string) {
+	var err error
+
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("/", i.handler)
+
+	i.listener, err = net.Listen("tcp", address)
+	if err != nil {
+		log.Fatal("HTTP input listener failure:", err)
+	}
+
+	go func() {
+		err = http.Serve(i.listener, mux)
+		if err != nil {
+			log.Fatal("HTTP input serve failure:", err)
+		}
+	}()
+}
+
+func (i *HTTPInput) String() string {
+	return "HTTP input: " + i.address
+}

input_http_test.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"github.com/buger/gor/proto"
+	"io"
+	"log"
+	"net/http"
+	"os/exec"
+	"strings"
+	"sync"
+	"testing"
+)
+
+func TestHTTPInput(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewHTTPInput("127.0.0.1:0")
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	address := strings.Replace(input.listener.Addr().String(), "[::]", "127.0.0.1", -1)
+
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+		http.Get("http://" + address + "/")
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestInputHTTPLargePayload(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	dd := exec.Command("dd", "if=/dev/urandom", "of=/tmp/large", "bs=1", "count=4000000")
+	err := dd.Run()
+	if err != nil {
+		log.Fatal("dd error:", err)
+	}
+
+	input := NewHTTPInput("127.0.0.1:0")
+	output := NewTestOutput(func(data []byte) {
+		if len(proto.Body(payloadBody(data))) != 4000000 {
+			t.Error("Should receive full file")
+		}
+		wg.Done()
+	})
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	wg.Add(1)
+	address := strings.Replace(input.listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	curl := exec.Command("curl", "http://"+address, "--data-binary", "@/tmp/large")
+	err = curl.Run()
+	if err != nil {
+		log.Fatal("curl error:", err)
+	}
+
+	wg.Wait()
+	close(quit)
+}

input_raw.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"github.com/buger/gor/proto"
+	raw "github.com/buger/gor/raw_socket_listener"
+	"log"
+	"net"
+	"time"
+)
+
+// RAWInput used for intercepting traffic for given address
+type RAWInput struct {
+	data          chan *raw.TCPMessage
+	address       string
+	expire        time.Duration
+	quit          chan bool
+	engine        int
+	realIPHeader  []byte
+	trackResponse bool
+	listener      *raw.Listener
+}
+
+// Available engines for intercepting traffic
+const (
+	EngineRawSocket = 1 << iota
+	EnginePcap
+	EnginePcapFile
+)
+
+// NewRAWInput constructor for RAWInput. Accepts address with port as argument.
+func NewRAWInput(address string, engine int, trackResponse bool, expire time.Duration, realIPHeader string) (i *RAWInput) {
+	i = new(RAWInput)
+	i.data = make(chan *raw.TCPMessage)
+	i.address = address
+	i.expire = expire
+	i.engine = engine
+	i.realIPHeader = []byte(realIPHeader)
+	i.quit = make(chan bool)
+	i.trackResponse = trackResponse
+
+	i.listen(address)
+	i.listener.IsReady()
+
+	return
+}
+
+func (i *RAWInput) Read(data []byte) (int, error) {
+	msg := <-i.data
+	buf := msg.Bytes()
+
+	var header []byte
+
+	if msg.IsIncoming {
+		header = payloadHeader(RequestPayload, msg.UUID(), msg.Start.UnixNano(), -1)
+		if len(i.realIPHeader) > 0 {
+			buf = proto.SetHeader(buf, i.realIPHeader, []byte(msg.IP().String()))
+		}
+	} else {
+		header = payloadHeader(ResponsePayload, msg.UUID(), msg.AssocMessage.Start.UnixNano(), msg.End.UnixNano()-msg.AssocMessage.Start.UnixNano())
+	}
+
+	copy(data[0:len(header)], header)
+	copy(data[len(header):], buf)
+
+	return len(buf) + len(header), nil
+}
+
+func (i *RAWInput) listen(address string) {
+	Debug("Listening for traffic on: " + address)
+
+	host, port, err := net.SplitHostPort(address)
+
+	if i.engine == EnginePcapFile {
+		host = address
+		port = "1"
+		err = nil
+	}
+
+	if err != nil {
+		log.Fatal("input-raw: error while parsing address", err)
+	}
+
+	i.listener = raw.NewListener(host, port, i.engine, i.trackResponse, i.expire)
+
+	ch := i.listener.Receiver()
+
+	go func() {
+		for {
+			select {
+			case <-i.quit:
+				return
+			default:
+			}
+
+			// Receiving TCPMessage object
+			m := <-ch
+
+			i.data <- m
+		}
+	}()
+}
+
+func (i *RAWInput) String() string {
+	return "Intercepting traffic from: " + i.address
+}
+
+func (i *RAWInput) Close() error {
+	i.listener.Close()
+	close(i.quit)
+	return nil
+}

input_raw_test.go

@@ -0,0 +1,423 @@
+package main
+
+import (
+	"bytes"
+	"github.com/buger/gor/proto"
+	"io"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/http/httputil"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+const testRawExpire = time.Millisecond * 200
+
+func TestRAWInputIPv4(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	origin := &http.Server{
+		Handler:      http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	go origin.Serve(listener)
+	defer listener.Close()
+
+	originAddr := listener.Addr().String()
+
+	var respCounter, reqCounter int64
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "X-Real-IP")
+	defer input.Close()
+
+	output := NewTestOutput(func(data []byte) {
+		if data[0] == '1' {
+			body := payloadBody(data)
+			if len(proto.Header(body, []byte("X-Real-IP"))) == 0 {
+				t.Error("Should have X-Real-IP header", string(body))
+			}
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+
+		if Settings.debug {
+			log.Println(reqCounter, respCounter)
+		}
+
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	client := NewHTTPClient("http://"+listener.Addr().String(), &HTTPClientConfig{})
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		// request + response
+		wg.Add(2)
+		client.Get("/")
+		time.Sleep(2 * time.Millisecond)
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestRAWInputNoKeepAlive(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	origin := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Write([]byte("a"))
+			w.Write([]byte("b"))
+		}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	origin.SetKeepAlivesEnabled(false)
+	go origin.Serve(listener)
+	defer listener.Close()
+
+	originAddr := listener.Addr().String()
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	client := NewHTTPClient("http://"+listener.Addr().String(), &HTTPClientConfig{})
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		// request + response
+		wg.Add(2)
+		client.Get("/")
+		time.Sleep(2 * time.Millisecond)
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestRAWInputIPv6(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	listener, err := net.Listen("tcp", "[::1]:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	origin := &http.Server{
+		Handler:      http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	go origin.Serve(listener)
+	defer listener.Close()
+
+	originAddr := listener.Addr().String()
+
+	var respCounter, reqCounter int64
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	output := NewTestOutput(func(data []byte) {
+		if data[0] == '1' {
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+
+		if Settings.debug {
+			log.Println(reqCounter, respCounter)
+		}
+
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	client := NewHTTPClient("http://"+listener.Addr().String(), &HTTPClientConfig{})
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		// request + response
+		wg.Add(2)
+		client.Get("/")
+		time.Sleep(2 * time.Millisecond)
+	}
+
+	wg.Wait()
+	close(quit)
+}
+
+func TestInputRAW100Expect(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	fileContent, _ := ioutil.ReadFile("COMM-LICENSE")
+
+	// Origing and Replay server initialization
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		ioutil.ReadAll(r.Body)
+		wg.Done()
+	}))
+	defer origin.Close()
+
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+
+	input := NewRAWInput(originAddr, EnginePcap, true, time.Second, "")
+	defer input.Close()
+
+	// We will use it to get content of raw HTTP request
+	testOutput := NewTestOutput(func(data []byte) {
+		switch data[0] {
+		case RequestPayload:
+			if strings.Contains(string(data), "Expect: 100-continue") {
+				t.Error("Should not contain 100-continue header")
+			}
+			wg.Done()
+		case ResponsePayload:
+			wg.Done()
+		}
+	})
+
+	replay := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		body, _ := ioutil.ReadAll(r.Body)
+
+		if !bytes.Equal(body, fileContent) {
+			buf, _ := httputil.DumpRequest(r, true)
+			t.Error("Wrong POST body:", string(buf))
+		}
+
+		wg.Done()
+	}))
+	defer replay.Close()
+
+	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{testOutput, httpOutput}
+
+	go Start(quit)
+
+	// Origin + Response/Request Test Output + Request Http Output
+	wg.Add(4)
+	curl := exec.Command("curl", "http://"+originAddr, "--data-binary", "@COMM-LICENSE")
+	err := curl.Run()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	wg.Wait()
+	close(quit)
+}
+
+func TestInputRAWChunkedEncoding(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	fileContent, _ := ioutil.ReadFile("README.md")
+
+	// Origing and Replay server initialization
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		ioutil.ReadAll(r.Body)
+
+		wg.Done()
+	}))
+
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	input := NewRAWInput(originAddr, EnginePcap, true, time.Second, "")
+	defer input.Close()
+
+	replay := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		body, _ := ioutil.ReadAll(r.Body)
+
+		if !bytes.Equal(body, fileContent) {
+			buf, _ := httputil.DumpRequest(r, true)
+			t.Error("Wrong POST body:", string(buf))
+		}
+
+		wg.Done()
+	}))
+	defer replay.Close()
+
+	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{Debug: true})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{httpOutput}
+
+	go Start(quit)
+
+	wg.Add(2)
+
+	curl := exec.Command("curl", "http://"+originAddr, "--header", "Transfer-Encoding: chunked", "--header", "Expect:", "--data-binary", "@README.md")
+	err := curl.Run()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestInputRAWLargePayload(t *testing.T) {
+	// FIXME: Large payloads does not work for travis for some reason...
+	if os.Getenv("TRAVIS_BUILD_DIR") != "" {
+		return
+	}
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+	sizeB := 100 * 1000
+
+	// Generate 100kb file
+	dd := exec.Command("dd", "if=/dev/urandom", "of=/tmp/large", "bs=1", "count="+strconv.Itoa(sizeB))
+	err := dd.Run()
+	if err != nil {
+		log.Fatal("dd error:", err)
+	}
+
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		defer req.Body.Close()
+		body, _ := ioutil.ReadAll(req.Body)
+
+		if len(body) != sizeB {
+			t.Error("File size should be 1mb:", len(body))
+		}
+
+		wg.Done()
+	}))
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	replay := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		body, _ := ioutil.ReadAll(req.Body)
+		// // req.Body = http.MaxBytesReader(w, req.Body, 1*1024*1024)
+		// // buf := make([]byte, 1*1024*1024)
+		// n, _ := req.Body.Read(buf)
+		// body := buf[0:n]
+
+		if len(body) != sizeB {
+			t.Errorf("File size should be %d bytes: %d", sizeB, len(body))
+		}
+
+		wg.Done()
+	}))
+	defer replay.Close()
+
+	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{Debug: false})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{httpOutput}
+
+	go Start(quit)
+
+	wg.Add(2)
+	curl := exec.Command("curl", "http://"+originAddr, "--header", "Transfer-Encoding: chunked", "--header", "Expect:", "--data-binary", "@/tmp/large")
+	err = curl.Run()
+	if err != nil {
+		log.Fatal("curl error:", err)
+	}
+
+	wg.Wait()
+	close(quit)
+}
+
+func BenchmarkRAWInput(b *testing.B) {
+	quit := make(chan int)
+
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+	defer origin.Close()
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+
+	var respCounter, reqCounter int64
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	output := NewTestOutput(func(data []byte) {
+		if data[0] == '1' {
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+
+		// log.Println("Captured ", reqCounter, "requests and ", respCounter, " responses")
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	emitted := 0
+	fileContent, _ := ioutil.ReadFile("LICENSE.txt")
+
+	for i := 0; i < b.N; i++ {
+		wg := new(sync.WaitGroup)
+		wg.Add(10 * 100)
+		emitted += 10 * 100
+		for w := 0; w < 100; w++ {
+			go func() {
+				client := NewHTTPClient(origin.URL, &HTTPClientConfig{})
+				for i := 0; i < 10; i++ {
+					if rand.Int63n(2) == 0 {
+						client.Post("/", fileContent)
+					} else {
+						client.Get("/")
+					}
+					time.Sleep(time.Duration(rand.Int63n(50)) * time.Millisecond)
+					wg.Done()
+				}
+			}()
+		}
+		wg.Wait()
+	}
+
+	time.Sleep(400 * time.Millisecond)
+	log.Println("Emitted ", emitted, ", Captured ", reqCounter, "requests and ", respCounter, " responses")
+
+	close(quit)
+}

input_tcp.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+)
+
+// TCPInput used for internal communication
+type TCPInput struct {
+	data     chan []byte
+	address  string
+	listener net.Listener
+}
+
+// NewTCPInput constructor for TCPInput, accepts address with port
+func NewTCPInput(address string) (i *TCPInput) {
+	i = new(TCPInput)
+	i.data = make(chan []byte, 1000)
+	i.address = address
+
+	i.listen(address)
+
+	return
+}
+
+func (i *TCPInput) Read(data []byte) (int, error) {
+	buf := <-i.data
+	copy(data, buf)
+
+	return len(buf), nil
+}
+
+func (i *TCPInput) listen(address string) {
+	listener, err := net.Listen("tcp", address)
+	i.listener = listener
+
+	if err != nil {
+		log.Fatal("Can't start:", err)
+	}
+
+	go func() {
+		for {
+			conn, err := listener.Accept()
+
+			if err != nil {
+				log.Println("Error while Accept()", err)
+				continue
+			}
+
+			go i.handleConnection(conn)
+		}
+	}()
+}
+
+func (i *TCPInput) handleConnection(conn net.Conn) {
+	defer conn.Close()
+
+	payloadSeparatorAsBytes := []byte(payloadSeparator)
+	reader := bufio.NewReader(conn)
+	var buffer bytes.Buffer
+
+	for {
+		line, err := reader.ReadBytes('\n')
+
+		if err != nil {
+			if err != io.EOF {
+				fmt.Fprintln(os.Stderr, "Unexpected error in input tcp connection:", err)
+			}
+			break
+
+		}
+
+		if bytes.Equal(payloadSeparatorAsBytes[1:], line) {
+			asBytes := buffer.Bytes()
+			buffer.Reset()
+
+			newBuf := make([]byte, len(asBytes)-1)
+			copy(newBuf, asBytes)
+
+			i.data <- newBuf
+		} else {
+			buffer.Write(line)
+		}
+	}
+}
+
+func (i *TCPInput) String() string {
+	return "TCP input: " + i.address
+}

input_tcp_test.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"io"
+	"log"
+	"net"
+	"sync"
+	"testing"
+)
+
+func TestTCPInput(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTCPInput("127.0.0.1:0")
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	tcpAddr, err := net.ResolveTCPAddr("tcp", input.listener.Addr().String())
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	conn, err := net.DialTCP("tcp", nil, tcpAddr)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	msg := []byte("1 1 1\nGET / HTTP/1.1\r\n\r\n")
+
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+		conn.Write(msg)
+		conn.Write([]byte(payloadSeparator))
+	}
+
+	wg.Wait()
+
+	close(quit)
+}

limiter.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"math/rand"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Limiter is a wrapper for input or output plugin which adds rate limiting
+type Limiter struct {
+	plugin    interface{}
+	limit     int
+	isPercent bool
+
+	currentRPS  int
+	currentTime int64
+}
+
+func parseLimitOptions(options string) (limit int, isPercent bool) {
+	if strings.Contains(options, "%") {
+		limit, _ = strconv.Atoi(strings.Split(options, "%")[0])
+		isPercent = true
+	} else {
+		limit, _ = strconv.Atoi(options)
+		isPercent = false
+	}
+
+	return
+}
+
+// NewLimiter constructor for Limiter, accepts plugin and options
+// `options` allow to sprcify relatve or absolute limiting
+func NewLimiter(plugin interface{}, options string) io.ReadWriter {
+	l := new(Limiter)
+	l.limit, l.isPercent = parseLimitOptions(options)
+	l.plugin = plugin
+	l.currentTime = time.Now().UnixNano()
+
+	// FileInput have its own rate limiting. Unlike other inputs we not just dropping requests, we can slow down or speed up request emittion.
+	if fi, ok := l.plugin.(*FileInput); ok && l.isPercent {
+		fi.speedFactor = float64(l.limit) / float64(100)
+	}
+
+	return l
+}
+
+func (l *Limiter) isLimited() bool {
+	// File input have its own limiting algorithm
+	if _, ok := l.plugin.(*FileInput); ok && l.isPercent {
+		return false
+	}
+
+	if l.isPercent {
+		return l.limit <= rand.Intn(100)
+	}
+
+	if (time.Now().UnixNano() - l.currentTime) > time.Second.Nanoseconds() {
+		l.currentTime = time.Now().UnixNano()
+		l.currentRPS = 0
+	}
+
+	if l.currentRPS >= l.limit {
+		return true
+	}
+
+	l.currentRPS++
+
+	return false
+}
+
+func (l *Limiter) Write(data []byte) (n int, err error) {
+	if l.isLimited() {
+		return 0, nil
+	}
+
+	n, err = l.plugin.(io.Writer).Write(data)
+
+	return
+}
+
+func (l *Limiter) Read(data []byte) (n int, err error) {
+	n, err = l.plugin.(io.Reader).Read(data)
+
+	if l.isLimited() {
+		return 0, nil
+	}
+
+	return
+}
+
+func (l *Limiter) String() string {
+	return fmt.Sprintf("Limiting %s to: %d (isPercent: %b)", l.plugin, l.limit, l.isPercent)
+}

limiter_test.go

@@ -0,0 +1,106 @@
+// +build !race
+
+package main
+
+import (
+	"io"
+	"sync"
+	"testing"
+)
+
+func TestOutputLimiter(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+	output := NewLimiter(NewTestOutput(func(data []byte) {
+		wg.Done()
+	}), "10")
+	wg.Add(10)
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestInputLimiter(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewLimiter(NewTestInput(), "10")
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+	wg.Add(10)
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		input.(*Limiter).plugin.(*TestInput).EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+// Should limit all requests
+func TestPercentLimiter1(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+	output := NewLimiter(NewTestOutput(func(data []byte) {
+		wg.Done()
+	}), "0%")
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+// Should not limit at all
+func TestPercentLimiter2(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+	output := NewLimiter(NewTestOutput(func(data []byte) {
+		wg.Done()
+	}), "100%")
+	wg.Add(100)
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}

listener/listener.go

@@ -1,89 +0,0 @@
-// Listener capture TCP traffic using RAW SOCKETS.
-// Note: it requires sudo or root access.
-//
-// Rigt now it suport only HTTP
-package listener
-
-import (
-	"bufio"
-	"bytes"
-	"fmt"
-	"log"
-	"net"
-	"net/http"
-	"os"
-	"strconv"
-)
-
-// Enable debug logging only if "--verbose" flag passed
-func Debug(v ...interface{}) {
-	if Settings.Verbose {
-		log.Println(v...)
-	}
-}
-
-func ReplayServer() (conn net.Conn, err error) {
-	// Connection to reaplay server
-	conn, err = net.Dial("tcp", Settings.ReplayAddress)
-
-	if err != nil {
-		log.Println("Connection error ", err, Settings.ReplayAddress)
-	}
-
-	return
-}
-
-// Because its sub-program, Run acts as `main`
-func Run() {
-	if os.Getuid() != 0 {
-		fmt.Println("Please start the listener as root or sudo!")
-		fmt.Println("This is required since listener sniff traffic on given port.")
-		os.Exit(1)
-	}
-
-	fmt.Println("Listening for HTTP traffic on", Settings.Address+":"+strconv.Itoa(Settings.Port))
-	fmt.Println("Forwarding requests to replay server:", Settings.ReplayAddress)
-
-	// Sniffing traffic from given address
-	listener := RAWTCPListen(Settings.Address, Settings.Port)
-
-	for {
-		// Receiving TCPMessage object
-		m := listener.Receive()
-
-		go sendMessage(m)
-	}
-}
-
-func sendMessage(m *TCPMessage) {
-	conn, err := ReplayServer()
-
-	if err != nil {
-		log.Println("Failed to send message. Replay server not respond.")
-		return
-	} else {
-		defer conn.Close()
-	}
-
-	// For debugging purpose
-	// Usually request parsing happens in replay part
-	if Settings.Verbose {
-		buf := bytes.NewBuffer(m.Bytes())
-		reader := bufio.NewReader(buf)
-
-		request, err := http.ReadRequest(reader)
-
-		if err != nil {
-			Debug("Error while parsing request:", err, string(m.Bytes()))
-		} else {
-			request.ParseMultipartForm(32 << 20)
-			Debug("Forwarding request:", request)
-		}
-	}
-
-	_, err = conn.Write(m.Bytes())
-
-	if err != nil {
-		log.Println("Error while sending requests", err)
-	}
-}

listener/raw_tcp_listener.go

@@ -1,159 +0,0 @@
-package listener
-
-import (
-	"encoding/binary"
-	"log"
-	"net"
-)
-
-// Capture traffic from socket using RAW_SOCKET's
-// http://en.wikipedia.org/wiki/Raw_socket
-//
-// RAW_SOCKET allow you listen for traffic on any port (e.g. sniffing) because they operate on IP level.
-// Ports is TCP feature, same as flow control, reliable transmission and etc.
-// Since we can't use default TCP libraries RAWTCPLitener implements own TCP layer
-// TCP packets is parsed using tcp_packet.go, and flow control is managed by tcp_message.go
-type RAWTCPListener struct {
-	messages []*TCPMessage // buffer of TCPMessages waiting to be send
-
-	c_packets  chan *TCPPacket
-	c_messages chan *TCPMessage // Messages ready to be send to client
-
-	c_del_message chan *TCPMessage // Used for notifications about completed or expired messages
-
-	addr string // IP to listen
-	port int    // Port to listen
-}
-
-func RAWTCPListen(addr string, port int) (listener *RAWTCPListener) {
-	listener = &RAWTCPListener{}
-
-	listener.c_packets = make(chan *TCPPacket)
-	listener.c_messages = make(chan *TCPMessage)
-	listener.c_del_message = make(chan *TCPMessage)
-
-	listener.addr = addr
-	listener.port = port
-
-	go listener.listen()
-	go listener.readRAWSocket()
-
-	return
-}
-
-func (t *RAWTCPListener) listen() {
-	for {
-		select {
-		// If message ready for deletion it means that its also complete or expired by timeout
-		case message := <-t.c_del_message:
-			t.c_messages <- message
-			t.deleteMessage(message)
-
-		// We need to use channgels to process each packet to avoid data races
-		case packet := <-t.c_packets:
-			t.processTCPPacket(packet)
-		}
-	}
-}
-
-// Deleting messages that came from t.c_del_message channel
-func (t *RAWTCPListener) deleteMessage(message *TCPMessage) bool {
-	var idx int = -1
-
-	// Searching for given message in messages buffer
-	for i, m := range t.messages {
-		if m.Ack == message.Ack {
-			idx = i
-			break
-		}
-	}
-
-	if idx == -1 {
-		return false
-	}
-
-	// Delete element from array
-	// Note: that this version for arrays that consist of pointers
-	// https://code.google.com/p/go-wiki/wiki/SliceTricks
-	copy(t.messages[idx:], t.messages[idx+1:])
-	t.messages[len(t.messages)-1] = nil // Ensure that value will be garbage-collected.
-	t.messages = t.messages[:len(t.messages)-1]
-
-	return true
-}
-
-func (t *RAWTCPListener) readRAWSocket() {
-	conn, e := net.ListenPacket("ip4:tcp", t.addr)
-	defer conn.Close()
-
-	if e != nil {
-		log.Fatal(e)
-	}
-
-	buf := make([]byte, 4096*2)
-
-	for {
-		// Note: ReadFrom receive messages without IP header
-		n, _, err := conn.ReadFrom(buf)
-
-		if err != nil {
-			Debug("Error:", err)
-		}
-
-		if n > 0 {
-			// To avoid full packet parsing every time, we manually parsing values needed for packet filtering
-			// http://en.wikipedia.org/wiki/Transmission_Control_Protocol
-			dest_port := binary.BigEndian.Uint16(buf[2:4])
-
-			// Because RAW_SOCKET can't be bound to port, we have to control it by ourself
-			if int(dest_port) == t.port {
-				// Check TCPPacket code for more description
-				flags := binary.BigEndian.Uint16(buf[12:14]) & 0x1FF
-				f_psh := (flags & TCP_PSH) != 0
-
-				// We need only packets with data inside
-				// TCP PSH flag indicate that packet have data inside
-				if f_psh {
-					// We should create new buffer because go slices is pointers. So buffer data shoud be immutable.
-					new_buf := make([]byte, n)
-					copy(new_buf, buf[:n])
-
-					// To avoid socket locking processing packet in new goroutine
-					go func(buf []byte) {
-						packet := NewTCPPacket(new_buf)
-						t.c_packets <- packet
-					}(new_buf)
-				}
-			}
-		}
-	}
-}
-
-// Trying to add packet to existing message or creating new message
-//
-// For TCP message unique id is Acknowledgment number (see tcp_packet.go)
-func (t *RAWTCPListener) processTCPPacket(packet *TCPPacket) {
-	var message *TCPMessage
-
-	// Searching for message with same Ack
-	for _, msg := range t.messages {
-		if msg.Ack == packet.Ack {
-			message = msg
-			break
-		}
-	}
-
-	if message == nil {
-		// We sending c_del_message channel, so message object can communicate with Listener and notify it if message completed
-		message = NewTCPMessage(packet.Ack, t.c_del_message)
-
-		t.messages = append(t.messages, message)
-	}
-
-	// Adding packet to message
-	message.c_packets <- packet
-}
-
-func (t *RAWTCPListener) Receive() *TCPMessage {
-	return <-t.c_messages
-}

listener/settings.go

@@ -1,38 +0,0 @@
-package listener
-
-import (
-	"flag"
-	"os"
-)
-
-const (
-	defaultPort    = 80
-	defaultAddress = "0.0.0.0"
-
-	defaultReplayAddress = "localhost:28020"
-)
-
-type ListenerSettings struct {
-	Port    int
-	Address string
-
-	ReplayAddress string
-
-	Verbose bool
-}
-
-var Settings ListenerSettings = ListenerSettings{}
-
-func init() {
-	if len(os.Args) < 2 || os.Args[1] != "listen" {
-		return
-	}
-
-	flag.IntVar(&Settings.Port, "p", defaultPort, "Specify the http server port whose traffic you want to capture")
-
-	flag.StringVar(&Settings.Address, "ip", defaultAddress, "Specifi IP address to listen")
-
-	flag.StringVar(&Settings.ReplayAddress, "r", defaultReplayAddress, "Address of replay server.")
-
-	flag.BoolVar(&Settings.Verbose, "verbose", false, "Log requests")
-}

listener/tcp_message.go

@@ -1,106 +0,0 @@
-package listener
-
-import (
-	"sort"
-	"time"
-)
-
-const MSG_EXPIRE = 200 * time.Millisecond
-
-// TCPMessage ensure that all TCP packets for given request is received, and processed in right sequence
-// Its needed because all TCP message can be fragmented or re-transmitted
-//
-// Each TCP Packet have 2 ids: acknowledgement - message_id, and sequence - packet_id
-// Message can be compiled from unique packets with same message_id which sorted by sequence
-// Message is received if we did't receive any packets for 200ms
-type TCPMessage struct {
-	Ack     uint32 // Message ID
-	packets []*TCPPacket
-
-	timer *time.Timer // Used for expire check
-
-	expired bool
-
-	c_packets chan *TCPPacket
-	c_closing chan int
-
-	c_del_message chan *TCPMessage
-}
-
-func NewTCPMessage(Ack uint32, c_del chan *TCPMessage) (msg *TCPMessage) {
-	msg = &TCPMessage{Ack: Ack}
-
-	msg.c_packets = make(chan *TCPPacket)
-	msg.c_closing = make(chan int)
-	msg.c_del_message = c_del // used for notifying that message completed or expired
-
-	// Every time we receive packet we reset this timer
-	msg.timer = time.AfterFunc(MSG_EXPIRE, msg.Timeout)
-
-	go msg.listen()
-
-	return
-}
-
-func (t *TCPMessage) listen() {
-	for {
-		select {
-		case <-t.c_closing:
-			close(t.c_packets)
-			return // Stop loop if message completed/expired
-		case packet := <-t.c_packets:
-			t.AddPacket(packet)
-		}
-	}
-}
-
-func (t *TCPMessage) Timeout() {
-	t.c_closing <- 1     // Notify to stop listen loop and close channel
-	t.c_del_message <- t // Notify RAWListener that message is ready to be send to replay server
-}
-
-// Sort packets in right orders and return message content
-func (t *TCPMessage) Bytes() (output []byte) {
-	mk := make([]int, len(t.packets))
-
-	i := 0
-	for k, _ := range t.packets {
-		mk[i] = k
-		i++
-	}
-
-	sort.Ints(mk)
-
-	for _, k := range mk {
-		output = append(output, t.packets[k].Data...)
-	}
-
-	return
-}
-
-// Add packet to the message and ensure packet uniquiness
-// TCP allows that packet can be re-send multiple times
-func (t *TCPMessage) AddPacket(packet *TCPPacket) {
-	if t.expired {
-		Debug("Adding packet to expired message")
-		return
-	}
-
-	packetFound := false
-
-	for _, pkt := range t.packets {
-		if packet.Seq == pkt.Seq {
-			packetFound = true
-			break
-		}
-	}
-
-	if packetFound {
-		Debug("Received packet with same sequence")
-	} else {
-		t.packets = append(t.packets, packet)
-	}
-
-	// Reset message timeout timer
-	t.timer.Reset(MSG_EXPIRE)
-}

listener/tcp_packet.go

@@ -1,93 +0,0 @@
-package listener
-
-import (
-	"encoding/binary"
-	"strconv"
-	"strings"
-)
-
-// TCP Flags
-const (
-	TCP_FIN = 1 << iota
-	TCP_SYN
-	TCP_RST
-	TCP_PSH
-	TCP_ACK
-	TCP_URG
-	TCP_ECE
-	TCP_CWR
-	TCP_NS
-)
-
-// Simple TCP packet parser
-//
-// Packet structure: http://en.wikipedia.org/wiki/Transmission_Control_Protocol
-type TCPPacket struct {
-	SrcPort    uint16
-	DestPort   uint16
-	Seq        uint32
-	Ack        uint32
-	DataOffset uint8
-	Flags      uint16
-	Window     uint16
-	Checksum   uint16
-	Urgent     uint16
-
-	Data []byte
-}
-
-func NewTCPPacket(b []byte) (p *TCPPacket) {
-	p = &TCPPacket{Data: b}
-	p.ParseFast()
-
-	return p
-}
-
-// Inspired by: https://github.com/miekg/pcap/blob/master/packet.go
-func (t *TCPPacket) Parse() {
-	t.SrcPort = binary.BigEndian.Uint16(t.Data[0:2])
-	t.DestPort = binary.BigEndian.Uint16(t.Data[2:4])
-	t.Seq = binary.BigEndian.Uint32(t.Data[4:8])
-	t.Ack = binary.BigEndian.Uint32(t.Data[8:12])
-	t.DataOffset = (t.Data[12] & 0xF0) >> 4
-	t.Flags = binary.BigEndian.Uint16(t.Data[12:14]) & 0x1FF
-	t.Window = binary.BigEndian.Uint16(t.Data[14:16])
-	t.Checksum = binary.BigEndian.Uint16(t.Data[16:18])
-	t.Urgent = binary.BigEndian.Uint16(t.Data[18:20])
-
-	t.Data = t.Data[t.DataOffset*4:]
-}
-
-// Parse only needed set of fields
-func (t *TCPPacket) ParseFast() {
-	t.Seq = binary.BigEndian.Uint32(t.Data[4:8])
-	t.Ack = binary.BigEndian.Uint32(t.Data[8:12])
-
-	t.DataOffset = (t.Data[12] & 0xF0) >> 4
-	t.Data = t.Data[t.DataOffset*4:]
-}
-
-func (t *TCPPacket) String() string {
-	return strings.Join([]string{
-		"Source port: " + strconv.Itoa(int(t.SrcPort)),
-		"Dest port:" + strconv.Itoa(int(t.DestPort)),
-		"Sequence:" + strconv.Itoa(int(t.Seq)),
-		"Acknowledgement:" + strconv.Itoa(int(t.Ack)),
-		"Header len:" + strconv.Itoa(int(t.DataOffset)),
-
-		"Flag ns:" + strconv.FormatBool(t.Flags&TCP_NS != 0),
-		"Flag crw:" + strconv.FormatBool(t.Flags&TCP_CWR != 0),
-		"Flag ece:" + strconv.FormatBool(t.Flags&TCP_ECE != 0),
-		"Flag urg:" + strconv.FormatBool(t.Flags&TCP_URG != 0),
-		"Flag ack:" + strconv.FormatBool(t.Flags&TCP_ACK != 0),
-		"Flag psh:" + strconv.FormatBool(t.Flags&TCP_PSH != 0),
-		"Flag rst:" + strconv.FormatBool(t.Flags&TCP_RST != 0),
-		"Flag syn:" + strconv.FormatBool(t.Flags&TCP_SYN != 0),
-		"Flag fin:" + strconv.FormatBool(t.Flags&TCP_FIN != 0),
-
-		"Window size:" + strconv.Itoa(int(t.Window)),
-		"Checksum:" + strconv.Itoa(int(t.Checksum)),
-
-		"Data:" + string(t.Data),
-	}, "\n")
-}

middleware.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"bufio"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+)
+
+type Middleware struct {
+	command string
+
+	data chan []byte
+
+	mu sync.Mutex
+
+	Stdin  io.Writer
+	Stdout io.Reader
+}
+
+func NewMiddleware(command string) *Middleware {
+	m := new(Middleware)
+	m.command = command
+	m.data = make(chan []byte, 1000)
+
+	commands := strings.Split(command, " ")
+	cmd := exec.Command(commands[0], commands[1:]...)
+
+	m.Stdout, _ = cmd.StdoutPipe()
+	m.Stdin, _ = cmd.StdinPipe()
+
+	if Settings.verbose {
+		cmd.Stderr = os.Stderr
+	}
+
+	go m.read(m.Stdout)
+
+	go func() {
+		err := cmd.Start()
+
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		err = cmd.Wait()
+
+		if err != nil {
+			log.Fatal(err)
+		}
+	}()
+
+	return m
+}
+
+func (m *Middleware) ReadFrom(plugin io.Reader) {
+	Debug("[MIDDLEWARE-MASTER] Starting reading from", plugin)
+	go m.copy(m.Stdin, plugin)
+}
+
+func (m *Middleware) copy(to io.Writer, from io.Reader) {
+	buf := make([]byte, 5*1024*1024)
+	dst := make([]byte, len(buf)*2)
+
+	for {
+		nr, _ := from.Read(buf)
+		if nr > 0 && len(buf) > nr {
+
+			hex.Encode(dst, buf[0:nr])
+			dst[nr*2] = '\n'
+
+			m.mu.Lock()
+			to.Write(dst[0 : nr*2+1])
+			m.mu.Unlock()
+
+			if Settings.debug {
+				Debug("[MIDDLEWARE-MASTER] Sending:", string(buf[0:nr]), "From:", from)
+			}
+		}
+	}
+}
+
+func (m *Middleware) read(from io.Reader) {
+	reader := bufio.NewReader(from)
+	var line []byte
+	var e error
+
+	for {
+		if line, e = reader.ReadBytes('\n'); e != nil {
+			if e == io.EOF {
+				continue
+			} else {
+				break
+			}
+		}
+
+		buf := make([]byte, len(line)/2)
+		if _, err := hex.Decode(buf, line[:len(line)-1]); err != nil {
+			fmt.Fprintln(os.Stderr, "Failed to decode input payload", err, len(line))
+		}
+
+		if Settings.debug {
+			Debug("[MIDDLEWARE-MASTER] Received:", string(buf))
+		}
+
+		m.data <- buf
+	}
+
+	return
+}
+
+func (m *Middleware) Read(data []byte) (int, error) {
+	buf := <-m.data
+	copy(data, buf)
+
+	return len(buf), nil
+}
+
+func (m *Middleware) String() string {
+	return fmt.Sprintf("Modifying traffic using '%s' command", m.command)
+}

middleware_test.go

@@ -0,0 +1,220 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"github.com/buger/gor/proto"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+type fakeServiceCb func(string, int, []byte)
+
+// Simple service that generate token on request, and require this token for accesing to secure area
+func NewFakeSecureService(wg *sync.WaitGroup, cb fakeServiceCb) *httptest.Server {
+	active_tokens := make([]string, 0)
+	var mu sync.Mutex
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		mu.Lock()
+		defer mu.Unlock()
+		Debug("Received request: " + req.URL.String())
+
+		switch req.URL.Path {
+		case "/token":
+			// Generate random token
+			token_length := 10
+			buf := make([]byte, token_length)
+			rand.Read(buf)
+			token := hex.EncodeToString(buf)
+			active_tokens = append(active_tokens, token)
+
+			w.Write([]byte(token))
+
+			cb(req.URL.Path, 200, []byte(token))
+		case "/secure":
+			token := req.URL.Query().Get("token")
+			token_found := false
+
+			for _, t := range active_tokens {
+				if t == token {
+					token_found = true
+					break
+				}
+			}
+
+			if token_found {
+				w.WriteHeader(http.StatusAccepted)
+				cb(req.URL.Path, 202, []byte(nil))
+			} else {
+				w.WriteHeader(http.StatusForbidden)
+				cb(req.URL.Path, 403, []byte(nil))
+			}
+		}
+
+		wg.Done()
+	}))
+
+	return server
+}
+
+func TestFakeSecureService(t *testing.T) {
+	var resp, token []byte
+
+	wg := new(sync.WaitGroup)
+
+	server := NewFakeSecureService(wg, func(path string, status int, resp []byte) {
+	})
+	defer server.Close()
+
+	wg.Add(3)
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true})
+	resp, _ = client.Get("/token")
+	token = proto.Body(resp)
+
+	// Right token
+	resp, _ = client.Get("/secure?token=" + string(token))
+	if !bytes.Equal(proto.Status(resp), []byte("202")) {
+		t.Error("Valid token should return status 202:", string(proto.Status(resp)))
+	}
+
+	// Wrong tokens forbidden
+	resp, _ = client.Get("/secure?token=wrong")
+	if !bytes.Equal(proto.Status(resp), []byte("403")) {
+		t.Error("Wrong token should returns status 403:", string(proto.Status(resp)))
+	}
+
+	wg.Wait()
+}
+
+func TestEchoMiddleware(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	from := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Env", "prod")
+		w.Header().Set("RequestPath", r.URL.Path)
+		wg.Done()
+	}))
+	defer from.Close()
+
+	to := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Env", "test")
+		w.Header().Set("RequestPath", r.URL.Path)
+		wg.Done()
+	}))
+	defer to.Close()
+
+	quit := make(chan int)
+
+	Settings.middleware = "./examples/middleware/echo.sh"
+
+	// Catch traffic from one service
+	fromAddr := strings.Replace(from.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	input := NewRAWInput(fromAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	// And redirect to another
+	output := NewHTTPOutput(to.URL, &HTTPOutputConfig{Debug: false})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	// Start Gor
+	go Start(quit)
+
+	// Wait till middleware initialization
+	time.Sleep(100 * time.Millisecond)
+
+	// Should receive 2 requests from original + 2 from replayed
+	client := NewHTTPClient(from.URL, &HTTPClientConfig{Debug: false})
+
+	for i := 0; i < 10; i++ {
+		wg.Add(4)
+		// Request should be echoed
+		client.Get("/a")
+		time.Sleep(5 * time.Millisecond)
+		client.Get("/b")
+		time.Sleep(5 * time.Millisecond)
+	}
+
+	wg.Wait()
+	close(quit)
+	time.Sleep(200 * time.Millisecond)
+
+	Settings.middleware = ""
+}
+
+func TestTokenMiddleware(t *testing.T) {
+	var resp, token []byte
+
+	wg := new(sync.WaitGroup)
+
+	from := NewFakeSecureService(wg, func(path string, status int, tok []byte) {
+		time.Sleep(10 * time.Millisecond)
+	})
+	defer from.Close()
+
+	to := NewFakeSecureService(wg, func(path string, status int, tok []byte) {
+		switch path {
+		case "/secure":
+			if status != 202 {
+				t.Error("Server should receive valid rewritten token")
+			}
+		}
+
+		time.Sleep(10 * time.Millisecond)
+	})
+	defer to.Close()
+
+	quit := make(chan int)
+
+	Settings.middleware = "go run ./examples/middleware/token_modifier.go"
+
+	fromAddr := strings.Replace(from.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	// Catch traffic from one service
+	input := NewRAWInput(fromAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	// And redirect to another
+	output := NewHTTPOutput(to.URL, &HTTPOutputConfig{Debug: true})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	// Start Gor
+	go Start(quit)
+
+	// Wait for middleware to initialize
+	// Give go compiller time to build programm
+	time.Sleep(500 * time.Millisecond)
+
+	// Should receive 2 requests from original + 2 from replayed
+	wg.Add(4)
+
+	client := NewHTTPClient(from.URL, &HTTPClientConfig{Debug: true})
+
+	// Sending traffic to original service
+	resp, _ = client.Get("/token")
+	token = proto.Body(resp)
+
+	// When delay is too smal, middleware does not always rewrite requests in time
+	// Hopefuly client will have delay more then 100ms :)
+	time.Sleep(100 * time.Millisecond)
+
+	resp, _ = client.Get("/secure?token=" + string(token))
+	if !bytes.Equal(proto.Status(resp), []byte("202")) {
+		t.Error("Valid token should return 202:", proto.Status(resp))
+	}
+
+	wg.Wait()
+	close(quit)
+	time.Sleep(100 * time.Millisecond)
+	Settings.middleware = ""
+}

output_dummy.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+)
+
+// DummyOutput used for debugging, prints all incoming requests
+type DummyOutput struct {
+}
+
+// NewDummyOutput constructor for DummyOutput
+func NewDummyOutput() (di *DummyOutput) {
+	di = new(DummyOutput)
+
+	return
+}
+
+func (i *DummyOutput) Write(data []byte) (int, error) {
+	fmt.Println(string(data))
+
+	return len(data), nil
+}
+
+func (i *DummyOutput) String() string {
+	return "Dummy Output"
+}

output_file.go

@@ -0,0 +1,253 @@
+package main
+
+import (
+	"bufio"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"runtime/debug"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+var dateFileNameFuncs = map[string]func(*FileOutput) string{
+	"%Y":  func(o *FileOutput) string { return time.Now().Format("2006") },
+	"%m":  func(o *FileOutput) string { return time.Now().Format("01") },
+	"%d":  func(o *FileOutput) string { return time.Now().Format("02") },
+	"%H":  func(o *FileOutput) string { return time.Now().Format("15") },
+	"%M":  func(o *FileOutput) string { return time.Now().Format("04") },
+	"%S":  func(o *FileOutput) string { return time.Now().Format("05") },
+	"%NS": func(o *FileOutput) string { return fmt.Sprint(time.Now().Nanosecond()) },
+	"%r":  func(o *FileOutput) string { return o.currentID },
+}
+
+type FileOutputConfig struct {
+	flushInterval time.Duration
+	sizeLimit     unitSizeVar
+	queueLimit    int
+	append        bool
+}
+
+// FileOutput output plugin
+type FileOutput struct {
+	mu           	sync.Mutex
+	pathTemplate 	string
+	currentName  	string
+	file         	*os.File
+	queueLength  	int
+	chunkSize    	int
+	writer       	io.Writer
+	requestPerFile 	bool
+	currentID    	string
+
+	config *FileOutputConfig
+}
+
+// NewFileOutput constructor for FileOutput, accepts path
+func NewFileOutput(pathTemplate string, config *FileOutputConfig) *FileOutput {
+	o := new(FileOutput)
+	o.pathTemplate = pathTemplate
+	o.config = config
+	o.updateName()
+
+	if strings.Contains(pathTemplate, "%r") {
+		o.requestPerFile = true
+	}
+
+	go func() {
+		for {
+			time.Sleep(time.Second)
+			o.updateName()
+		}
+	}()
+
+	return o
+}
+
+func getFileIndex(name string) int {
+	ext := filepath.Ext(name)
+	withoutExt := strings.TrimSuffix(name, ext)
+
+	if idx := strings.LastIndex(withoutExt, "_"); idx != -1 {
+		if i, err := strconv.Atoi(withoutExt[idx+1:]); err == nil {
+			return i
+		}
+	}
+
+	return -1
+}
+
+func setFileIndex(name string, idx int) string {
+	idxS := strconv.Itoa(idx)
+	ext := filepath.Ext(name)
+	withoutExt := strings.TrimSuffix(name, ext)
+
+	if i := strings.LastIndex(withoutExt, "_"); i != -1 {
+		if _, err := strconv.Atoi(withoutExt[i+1:]); err == nil {
+			withoutExt = withoutExt[:i]
+		}
+	}
+
+	return withoutExt + "_" + idxS + ext
+}
+
+func withoutIndex(s string) string {
+	if i := strings.LastIndex(s, "_"); i != -1 {
+		return s[:i]
+	}
+
+	return s
+}
+
+type sortByFileIndex []string
+
+func (s sortByFileIndex) Len() int {
+	return len(s)
+}
+
+func (s sortByFileIndex) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func (s sortByFileIndex) Less(i, j int) bool {
+	if withoutIndex(s[i]) == withoutIndex(s[j]) {
+		return getFileIndex(s[i]) < getFileIndex(s[j])
+	}
+
+	return s[i] < s[j]
+}
+
+func (o *FileOutput) filename() string {
+	defer o.mu.Unlock()
+	o.mu.Lock()
+
+	path := o.pathTemplate
+
+	for name, fn := range dateFileNameFuncs {
+		path = strings.Replace(path, name, fn(o), -1)
+	}
+
+	if !o.config.append {
+		nextChunk := false
+
+		if o.currentName == "" ||
+			((o.config.queueLimit > 0 && o.queueLength >= o.config.queueLimit) ||
+				(o.config.sizeLimit > 0 && o.chunkSize >= int(o.config.sizeLimit))) {
+			nextChunk = true
+		}
+
+		ext := filepath.Ext(path)
+		withoutExt := strings.TrimSuffix(path, ext)
+
+		if matches, err := filepath.Glob(withoutExt + "*" + ext); err == nil {
+			if len(matches) == 0 {
+				return setFileIndex(path, 0)
+			}
+			sort.Sort(sortByFileIndex(matches))
+
+			last := matches[len(matches)-1]
+
+			fileIndex := 0
+			if idx := getFileIndex(last); idx != -1 {
+				fileIndex = idx
+
+				if nextChunk {
+					fileIndex++
+				}
+			}
+
+			return setFileIndex(last, fileIndex)
+		}
+	}
+
+	return path
+}
+
+func (o *FileOutput) updateName() {
+	o.currentName = filepath.Clean(o.filename())
+}
+
+func (o *FileOutput) Write(data []byte) (n int, err error) {
+	if o.requestPerFile {
+		o.currentID = string(payloadMeta(data)[1])
+		o.updateName()
+	}
+
+	if !isOriginPayload(data) {
+		return len(data), nil
+	}
+
+	if o.file == nil || o.currentName != o.file.Name() {
+		o.mu.Lock()
+		o.Close()
+
+		o.file, err = os.OpenFile(o.currentName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+		o.file.Sync()
+
+		if strings.HasSuffix(o.currentName, ".gz") {
+			o.writer = gzip.NewWriter(o.file)
+		} else {
+			o.writer = bufio.NewWriter(o.file)
+		}
+
+		if err != nil {
+			log.Fatal(o, "Cannot open file %q. Error: %s", o.currentName, err)
+		}
+
+		o.queueLength = 0
+		o.mu.Unlock()
+	}
+
+	o.writer.Write(data)
+	o.writer.Write([]byte(payloadSeparator))
+
+	o.queueLength++
+
+	return len(data), nil
+}
+
+func (o *FileOutput) flush() {
+	// Don't exit on panic
+	defer func() {
+		if r := recover(); r != nil {
+			log.Println("PANIC while file flush: ", r, o, string(debug.Stack()))
+		}
+	}()
+
+	defer o.mu.Unlock()
+	o.mu.Lock()
+
+	if o.file != nil {
+		if strings.HasSuffix(o.currentName, ".gz") {
+			o.writer.(*gzip.Writer).Flush()
+		} else {
+			o.writer.(*bufio.Writer).Flush()
+		}
+
+		if stat, err := o.file.Stat(); err != nil {
+			o.chunkSize = int(stat.Size())
+		}
+	}
+}
+
+func (o *FileOutput) String() string {
+	return "File output: " + o.file.Name()
+}
+
+func (o *FileOutput) Close() error {
+	if o.file != nil {
+		if strings.HasSuffix(o.currentName, ".gz") {
+			o.writer.(*gzip.Writer).Close()
+		} else {
+			o.writer.(*bufio.Writer).Flush()
+		}
+		o.file.Close()
+	}
+	return nil
+}

output_file_settings.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"strconv"
+	"strings"
+)
+
+var dataUnitMap = map[byte]int64{
+	'k': 1024,
+	'm': 1024 * 1024,
+	'g': 1024 * 1024 * 1024,
+}
+
+func parseDataUnit(s string) int64 {
+	// Allow kb, mb, gb
+	if strings.HasSuffix(s, "b") {
+		s = s[:len(s)-1]
+	}
+
+	if unit, ok := dataUnitMap[s[len(s)-1]]; ok {
+		size, _ := strconv.ParseInt(s[:len(s)-1], 10, 64)
+		return unit * size
+	} else {
+		// If no unit specified use bytes
+		size, _ := strconv.ParseInt(s, 10, 64)
+		return size
+	}
+}
+
+type unitSizeVar int64
+
+func (u unitSizeVar) String() string {
+	return strconv.Itoa(int(u))
+}
+
+func (u unitSizeVar) Set(s string) error {
+	u = unitSizeVar(parseDataUnit(s))
+	return nil
+}

output_file_test.go

@@ -0,0 +1,313 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"math/rand"
+	"os"
+	"reflect"
+	"sort"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestFileOutput(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+	output := NewFileOutput("/tmp/test_requests.gor", &FileOutputConfig{flushInterval: time.Minute, append: true})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		wg.Add(2)
+		input.EmitGET()
+		input.EmitPOST()
+	}
+	time.Sleep(100 * time.Millisecond)
+	output.flush()
+
+	close(quit)
+
+	quit = make(chan int)
+
+	var counter int64
+	input2 := NewFileInput("/tmp/test_requests.gor", false)
+	output2 := NewTestOutput(func(data []byte) {
+		atomic.AddInt64(&counter, 1)
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input2}
+	Plugins.Outputs = []io.Writer{output2}
+
+	go Start(quit)
+
+	wg.Wait()
+	close(quit)
+}
+
+func TestFileOutputWithNameCleaning(t *testing.T) {
+	output := &FileOutput{pathTemplate: "./test_requests.gor", config: &FileOutputConfig{flushInterval: time.Minute, append: false}}
+	expectedFileName := "test_requests_0.gor"
+	output.updateName()
+
+	if expectedFileName != output.currentName {
+		t.Errorf("Expected path %s but got %s", expectedFileName, output.currentName)
+	}
+
+}
+
+func TestFileOutputPathTemplate(t *testing.T) {
+	output := &FileOutput{pathTemplate: "/tmp/log-%Y-%m-%d-%S", config: &FileOutputConfig{flushInterval: time.Minute, append: true}}
+	now := time.Now()
+	expectedPath := fmt.Sprintf("/tmp/log-%s-%s-%s-%s", now.Format("2006"), now.Format("01"), now.Format("02"), now.Format("05"))
+	path := output.filename()
+
+	if expectedPath != path {
+		t.Errorf("Expected path %s but got %s", expectedPath, path)
+	}
+}
+
+func TestFileOutputMultipleFiles(t *testing.T) {
+	output := NewFileOutput("/tmp/log-%Y-%m-%d-%S", &FileOutputConfig{append: true, flushInterval: time.Minute})
+
+	if output.file != nil {
+		t.Error("Should not initialize file if no writes")
+	}
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	time.Sleep(time.Second)
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 == name1 {
+		t.Error("File name should change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputFilePerRequest(t *testing.T) {
+	output := NewFileOutput("/tmp/log-%Y-%m-%d-%S-%r", &FileOutputConfig{append: true})
+
+	if output.file != nil {
+		t.Error("Should not initialize file if no writes")
+	}
+
+	output.Write([]byte("1 1 1\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 2 1\ntest"))
+	name2 := output.file.Name()
+
+	time.Sleep(time.Second)
+	output.updateName()
+
+	output.Write([]byte("1 3 1\ntest"))
+	name3 := output.file.Name()
+
+	if name3 == name2 || name2 == name1 || name3 == name1 {
+		t.Error("File name should change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name2)
+	os.Remove(name3)
+}
+
+func TestFileOutputCompression(t *testing.T) {
+	output := NewFileOutput("/tmp/log-%Y-%m-%d-%S.gz", &FileOutputConfig{append: true, flushInterval: time.Minute})
+
+	if output.file != nil {
+		t.Error("Should not initialize file if no writes")
+	}
+
+	for i := 0; i < 1000; i++ {
+		output.Write([]byte("1 1 1\r\ntest"))
+	}
+
+	name := output.file.Name()
+	output.Close()
+
+	s, _ := os.Stat(name)
+	if s.Size() == 12*1000 {
+		t.Error("Should be compressed file:", s.Size())
+	}
+
+	os.Remove(name)
+}
+
+func TestParseDataUnit(t *testing.T) {
+	var tests = []struct {
+		value string
+		size  int64
+	}{
+		{"100kb", dataUnitMap['k'] * 100},
+		{"100k", dataUnitMap['k'] * 100},
+		{"1kb", dataUnitMap['k']},
+		{"1g", dataUnitMap['g']},
+		{"10m", dataUnitMap['m'] * 10},
+		{"zsaa312", 0},
+	}
+
+	for _, c := range tests {
+		if parseDataUnit(c.value) != c.size {
+			t.Error(c.value, "should be", c.size, "instead", parseDataUnit(c.value))
+		}
+	}
+}
+
+func TestGetFileIndex(t *testing.T) {
+	var tests = []struct {
+		path  string
+		index int
+	}{
+		{"/tmp/logs", -1},
+		{"/tmp/logs_1", 1},
+		{"/tmp/logs_2.gz", 2},
+		{"/tmp/logs_0.gz", 0},
+	}
+
+	for _, c := range tests {
+		if getFileIndex(c.path) != c.index {
+			t.Error(c.path, "should be", c.index, "instead", getFileIndex(c.path))
+		}
+	}
+}
+
+func TestSetFileIndex(t *testing.T) {
+	var tests = []struct {
+		path    string
+		index   int
+		newPath string
+	}{
+		{"/tmp/logs", 0, "/tmp/logs_0"},
+		{"/tmp/logs.gz", 1, "/tmp/logs_1.gz"},
+		{"/tmp/logs_1", 0, "/tmp/logs_0"},
+		{"/tmp/logs_0", 10, "/tmp/logs_10"},
+		{"/tmp/logs_0.gz", 10, "/tmp/logs_10.gz"},
+		{"/tmp/logs_underscores.gz", 10, "/tmp/logs_underscores_10.gz"},
+	}
+
+	for _, c := range tests {
+		if setFileIndex(c.path, c.index) != c.newPath {
+			t.Error(c.path, "should be", c.newPath, "instead", setFileIndex(c.path, c.index))
+		}
+	}
+}
+
+func TestFileOutputAppendQueueLimitOverflow(t *testing.T) {
+	rnd := rand.Int63()
+	name := fmt.Sprintf("/tmp/%d", rnd)
+
+	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, queueLimit: 2})
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0", rnd) {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 == name1 || name3 != fmt.Sprintf("/tmp/%d_1", rnd) {
+		t.Error("File name should change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputAppendQueueLimitNoOverflow(t *testing.T) {
+	rnd := rand.Int63()
+	name := fmt.Sprintf("/tmp/%d", rnd)
+
+	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, queueLimit: 3})
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0", rnd) {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 != name1 || name3 != fmt.Sprintf("/tmp/%d_0", rnd) {
+		t.Error("File name should not change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputAppendQueueLimitGzips(t *testing.T) {
+	rnd := rand.Int63()
+	name := fmt.Sprintf("/tmp/%d.gz", rnd)
+
+	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, queueLimit: 2})
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0.gz", rnd) {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 == name1 || name3 != fmt.Sprintf("/tmp/%d_1.gz", rnd) {
+		t.Error("File name should change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputSort(t *testing.T) {
+	var files = []string{"2016_0", "2014_10", "2015_0", "2015_10", "2015_2"}
+	var expected = []string{"2014_10", "2015_0", "2015_2", "2015_10", "2016_0"}
+	sort.Sort(sortByFileIndex(files))
+
+	if !reflect.DeepEqual(files, expected) {
+		t.Error("Should properly sort file names using indexes", files, expected)
+	}
+}

output_http.go

@@ -0,0 +1,220 @@
+package main
+
+import (
+	"io"
+	"sync/atomic"
+	"time"
+
+	"github.com/buger/gor/proto"
+)
+
+const initialDynamicWorkers = 10
+
+type response struct {
+	payload       []byte
+	uuid          []byte
+	roundTripTime int64
+	startedAt     int64
+}
+
+// HTTPOutputConfig struct for holding http output configuration
+type HTTPOutputConfig struct {
+	redirectLimit int
+
+	stats   bool
+	workers int
+
+	elasticSearch string
+
+	Timeout      time.Duration
+	OriginalHost bool
+	BufferSize   int
+
+	Debug bool
+
+	TrackResponses bool
+}
+
+// HTTPOutput plugin manage pool of workers which send request to replayed server
+// By default workers pool is dynamic and starts with 10 workers
+// You can specify fixed number of workers using `--output-http-workers`
+type HTTPOutput struct {
+	// Keep this as first element of struct because it guarantees 64bit
+	// alignment. atomic.* functions crash on 32bit machines if operand is not
+	// aligned at 64bit. See https://github.com/golang/go/issues/599
+	activeWorkers int64
+
+	address string
+	limit   int
+	queue   chan []byte
+
+	responses chan response
+
+	needWorker chan int
+
+	config *HTTPOutputConfig
+
+	queueStats *GorStat
+
+	elasticSearch *ESPlugin
+}
+
+// NewHTTPOutput constructor for HTTPOutput
+// Initialize workers
+func NewHTTPOutput(address string, config *HTTPOutputConfig) io.Writer {
+	o := new(HTTPOutput)
+
+	o.address = address
+	o.config = config
+
+	if o.config.stats {
+		o.queueStats = NewGorStat("output_http")
+	}
+
+	o.queue = make(chan []byte, 1000)
+	o.responses = make(chan response, 1000)
+	o.needWorker = make(chan int, 1)
+
+	// Initial workers count
+	if o.config.workers == 0 {
+		o.needWorker <- initialDynamicWorkers
+	} else {
+		o.needWorker <- o.config.workers
+	}
+
+	if o.config.elasticSearch != "" {
+		o.elasticSearch = new(ESPlugin)
+		o.elasticSearch.Init(o.config.elasticSearch)
+	}
+
+	if len(Settings.middleware) > 0 {
+		o.config.TrackResponses = true
+	}
+
+	go o.workerMaster()
+
+	return o
+}
+
+func (o *HTTPOutput) workerMaster() {
+	for {
+		newWorkers := <-o.needWorker
+		for i := 0; i < newWorkers; i++ {
+			go o.startWorker()
+		}
+
+		// Disable dynamic scaling if workers poll fixed size
+		if o.config.workers != 0 {
+			return
+		}
+	}
+}
+
+func (o *HTTPOutput) startWorker() {
+	client := NewHTTPClient(o.address, &HTTPClientConfig{
+		FollowRedirects:    o.config.redirectLimit,
+		Debug:              o.config.Debug,
+		OriginalHost:       o.config.OriginalHost,
+		Timeout:            o.config.Timeout,
+		ResponseBufferSize: o.config.BufferSize,
+	})
+
+	deathCount := 0
+
+	atomic.AddInt64(&o.activeWorkers, 1)
+
+	for {
+		select {
+		case data := <-o.queue:
+			o.sendRequest(client, data)
+			deathCount = 0
+		case <-time.After(time.Millisecond * 100):
+			// When dynamic scaling enabled workers die after 2s of inactivity
+			if o.config.workers == 0 {
+				deathCount++
+			} else {
+				continue
+			}
+
+			if deathCount > 20 {
+				workersCount := atomic.LoadInt64(&o.activeWorkers)
+
+				// At least 1 startWorker should be alive
+				if workersCount != 1 {
+					atomic.AddInt64(&o.activeWorkers, -1)
+					return
+				}
+			}
+		}
+	}
+}
+
+func (o *HTTPOutput) Write(data []byte) (n int, err error) {
+	if !isRequestPayload(data) {
+		return len(data), nil
+	}
+
+	buf := make([]byte, len(data))
+	copy(buf, data)
+
+	o.queue <- buf
+
+	if o.config.stats {
+		o.queueStats.Write(len(o.queue))
+	}
+
+	if o.config.workers == 0 {
+		workersCount := atomic.LoadInt64(&o.activeWorkers)
+
+		if len(o.queue) > int(workersCount) {
+			o.needWorker <- len(o.queue)
+		}
+	}
+
+	return len(data), nil
+}
+
+func (o *HTTPOutput) Read(data []byte) (int, error) {
+	resp := <-o.responses
+
+	Debug("[OUTPUT-HTTP] Received response:", string(resp.payload))
+
+	header := payloadHeader(ReplayedResponsePayload, resp.uuid, resp.roundTripTime, resp.startedAt)
+	copy(data[0:len(header)], header)
+	copy(data[len(header):], resp.payload)
+
+	return len(resp.payload) + len(header), nil
+}
+
+func (o *HTTPOutput) sendRequest(client *HTTPClient, request []byte) {
+	meta := payloadMeta(request)
+	if len(meta) < 2 {
+		return
+	}
+	uuid := meta[1]
+
+	body := payloadBody(request)
+	if !proto.IsHTTPPayload(body) {
+		return
+	}
+
+	start := time.Now()
+	resp, err := client.Send(body)
+	stop := time.Now()
+
+	if err != nil {
+		Debug("Request error:", err)
+	}
+
+	if o.config.TrackResponses {
+		o.responses <- response{resp, uuid, start.UnixNano(), stop.UnixNano() - start.UnixNano()}
+	}
+
+	if o.elasticSearch != nil {
+		o.elasticSearch.ResponseAnalyze(request, resp, start, stop)
+	}
+}
+
+func (o *HTTPOutput) String() string {
+	return "HTTP output: " + o.address
+}

output_http_test.go

@@ -0,0 +1,154 @@
+package main
+
+import (
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	_ "net/http/httputil"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestHTTPOutput(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		if req.Header.Get("User-Agent") != "Gor" {
+			t.Error("Wrong header")
+		}
+
+		if req.Method == "OPTIONS" {
+			t.Error("Wrong method")
+		}
+
+		if req.Method == "POST" {
+			defer req.Body.Close()
+			body, _ := ioutil.ReadAll(req.Body)
+
+			if string(body) != "a=1&b=2" {
+				t.Error("Wrong POST body:", string(body))
+			}
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	headers := HTTPHeaders{HTTPHeader{"User-Agent", "Gor"}}
+	methods := HTTPMethods{[]byte("GET"), []byte("PUT"), []byte("POST")}
+	Settings.modifierConfig = HTTPModifierConfig{headers: headers, methods: methods}
+
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{Debug: true})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		wg.Add(2) // OPTIONS should be ignored
+		input.EmitPOST()
+		input.EmitOPTIONS()
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+
+	Settings.modifierConfig = HTTPModifierConfig{}
+}
+
+func TestHTTPOutputKeepOriginalHost(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		if req.Host != "custom-host.com" {
+			t.Error("Wrong header", req.Host)
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	headers := HTTPHeaders{HTTPHeader{"Host", "custom-host.com"}}
+	Settings.modifierConfig = HTTPModifierConfig{headers: headers}
+
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{Debug: false, OriginalHost: true})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	wg.Add(1)
+	input.EmitGET()
+
+	wg.Wait()
+
+	close(quit)
+
+	Settings.modifierConfig = HTTPModifierConfig{}
+}
+
+func TestOutputHTTPSSL(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	// Origing and Replay server initialization
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		wg.Done()
+	}))
+
+	input := NewTestInput()
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	wg.Add(2)
+
+	input.EmitPOST()
+	input.EmitGET()
+
+	wg.Wait()
+	close(quit)
+}
+
+func BenchmarkHTTPOutput(b *testing.B) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		time.Sleep(50 * time.Millisecond)
+		wg.Done()
+	}))
+	defer server.Close()
+
+	input := NewTestInput()
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < b.N; i++ {
+		wg.Add(1)
+		input.EmitPOST()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}

output_kafka.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"encoding/json"
+	"github.com/Shopify/sarama"
+	"github.com/buger/gor/proto"
+	"io"
+	"log"
+	"strings"
+	"time"
+)
+
+// KafkaConfig should contains required information to
+// build producers.
+type KafkaConfig struct {
+	host  string
+	topic string
+}
+
+// KafkaOutput should make producer client.
+type KafkaOutput struct {
+	config   *KafkaConfig
+	producer sarama.AsyncProducer
+}
+
+// KafkaMessage should contains catched request information that should be
+// passed as Json to Apache Kafka.
+type KafkaMessage struct {
+	ReqURL     string            `json:"Req_URL"`
+	ReqMethod  string            `json:"Req_Method"`
+	ReqBody    string            `json:"Req_Body,omitempty"`
+	ReqHeaders map[string]string `json:"Req_Headers,omitempty"`
+}
+
+// KafkaOutputFrequency in milliseconds
+const KafkaOutputFrequency = 500
+
+// NewKafkaOutput creates instance of kafka producer client.
+func NewKafkaOutput(address string, config *KafkaConfig) io.Writer {
+	c := sarama.NewConfig()
+	c.Producer.RequiredAcks = sarama.WaitForLocal
+	c.Producer.Compression = sarama.CompressionSnappy
+	c.Producer.Flush.Frequency = KafkaOutputFrequency * time.Millisecond
+
+	brokerList := strings.Split(config.host, ",")
+
+	producer, err := sarama.NewAsyncProducer(brokerList, c)
+	if err != nil {
+		log.Fatalln("Failed to start Sarama(Kafka) producer:", err)
+	}
+
+	o := &KafkaOutput{
+		config:   config,
+		producer: producer,
+	}
+
+	if Settings.verbose {
+		// Start infinite loop for tracking errors for kafka producer.
+		go o.ErrorHandler()
+	}
+
+	return o
+}
+
+// ErrorHandler should receive errors
+func (o *KafkaOutput) ErrorHandler() {
+	for err := range o.producer.Errors() {
+		log.Println("Failed to write access log entry:", err)
+	}
+}
+
+func (o *KafkaOutput) Write(data []byte) (n int, err error) {
+	headers := make(map[string]string)
+	proto.ParseHeaders([][]byte{data}, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	req := payloadBody(data)
+
+	kafkaMessage := KafkaMessage{
+		ReqURL:     string(proto.Path(req)),
+		ReqMethod:  string(proto.Method(req)),
+		ReqBody:    string(proto.Body(req)),
+		ReqHeaders: headers,
+	}
+	jsonMessage, _ := json.Marshal(&kafkaMessage)
+	message := sarama.StringEncoder(jsonMessage)
+
+	o.producer.Input() <- &sarama.ProducerMessage{
+		Topic: o.config.topic,
+		Value: message,
+	}
+
+	return len(message), nil
+}

output_null.go

@@ -0,0 +1,18 @@
+package main
+
+// NullOutput used for debugging, prints nothing
+type NullOutput struct {
+}
+
+// NullOutput constructor for NullOutput
+func NewNullOutput() (o *NullOutput) {
+	return new(NullOutput)
+}
+
+func (o *NullOutput) Write(data []byte) (int, error) {
+	return len(data), nil
+}
+
+func (o *NullOutput) String() string {
+	return "Null Output"
+}

output_tcp.go

@@ -0,0 +1,99 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"time"
+)
+
+// TCPOutput used for sending raw tcp payloads
+// Currently used for internal communication between listener and replay server
+// Can be used for transfering binary payloads like protocol buffers
+type TCPOutput struct {
+	address  string
+	limit    int
+	buf      chan []byte
+	bufStats *GorStat
+}
+
+// NewTCPOutput constructor for TCPOutput
+// Initialize 10 workers which hold keep-alive connection
+func NewTCPOutput(address string) io.Writer {
+	o := new(TCPOutput)
+
+	o.address = address
+
+	o.buf = make(chan []byte, 100)
+	if Settings.outputTCPStats {
+		o.bufStats = NewGorStat("output_tcp")
+	}
+
+	for i := 0; i < 10; i++ {
+		go o.worker()
+	}
+
+	return o
+}
+
+func (o *TCPOutput) worker() {
+	retries := 1
+	conn, err := o.connect(o.address)
+	for {
+		if err == nil {
+			break
+		}
+
+		log.Println("Can't connect to aggregator instance, reconnecting in 1 second. Retries:", retries)
+		time.Sleep(1 * time.Second)
+
+		conn, err = o.connect(o.address)
+		retries++
+	}
+
+	if retries > 0 {
+		log.Println("Connected to aggregator instance after ", retries, " retries")
+	}
+
+	defer conn.Close()
+
+	for {
+		conn.Write(<-o.buf)
+		_, err := conn.Write([]byte(payloadSeparator))
+
+		if err != nil {
+			log.Println("Lost connection with aggregator instance, reconnecting")
+			go o.worker()
+			break
+		}
+	}
+}
+
+func (o *TCPOutput) Write(data []byte) (n int, err error) {
+	if !isOriginPayload(data) {
+		return len(data), nil
+	}
+
+	// We have to copy, because sending data in multiple threads
+	newBuf := make([]byte, len(data))
+	copy(newBuf, data)
+
+	o.buf <- newBuf
+
+	if Settings.outputTCPStats {
+		o.bufStats.Write(len(o.buf))
+	}
+
+	return len(data), nil
+}
+
+func (o *TCPOutput) connect(address string) (conn net.Conn, err error) {
+	conn, err = net.Dial("tcp", address)
+
+	return
+}
+
+func (o *TCPOutput) String() string {
+	return fmt.Sprintf("TCP output %s, limit: %d", o.address, o.limit)
+}

output_tcp_test.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"net"
+	"sync"
+	"testing"
+)
+
+func TestTCPOutput(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	listener := startTCP(func(data []byte) {
+		wg.Done()
+	})
+	input := NewTestInput()
+	output := NewTCPOutput(listener.Addr().String())
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func startTCP(cb func([]byte)) net.Listener {
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
+
+	if err != nil {
+		log.Fatal("Can't start:", err)
+	}
+
+	go func() {
+		for {
+			conn, _ := listener.Accept()
+			defer conn.Close()
+
+			go func() {
+				reader := bufio.NewReader(conn)
+				scanner := bufio.NewScanner(reader)
+				scanner.Split(payloadScanner)
+
+				for scanner.Scan() {
+					cb(scanner.Bytes())
+				}
+			}()
+		}
+	}()
+
+	return listener
+}
+
+func BenchmarkTCPOutput(b *testing.B) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	listener := startTCP(func(data []byte) {
+		wg.Done()
+	})
+	input := NewTestInput()
+	output := NewTCPOutput(listener.Addr().String())
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	close(quit)
+}

plugins.go

@@ -0,0 +1,149 @@
+package main
+
+import (
+	"io"
+	"reflect"
+	"strings"
+	"sync"
+	"time"
+)
+
+// InOutPlugins struct for holding references to plugins
+type InOutPlugins struct {
+	Inputs  []io.Reader
+	Outputs []io.Writer
+	All     []interface{}
+}
+
+var pluginMu sync.Mutex
+
+// Plugins holds all the plugin objects
+var Plugins *InOutPlugins = new(InOutPlugins)
+
+// extractLimitOptions detects if plugin get called with limiter support
+// Returns address and limit
+func extractLimitOptions(options string) (string, string) {
+	split := strings.Split(options, "|")
+
+	if len(split) > 1 {
+		return split[0], split[1]
+	}
+
+	return split[0], ""
+}
+
+// Automatically detects type of plugin and initialize it
+//
+// See this article if curious about relfect stuff below: http://blog.burntsushi.net/type-parametric-functions-golang
+func registerPlugin(constructor interface{}, options ...interface{}) {
+	var path, limit string
+	vc := reflect.ValueOf(constructor)
+
+	// Pre-processing options to make it work with reflect
+	vo := []reflect.Value{}
+	for _, oi := range options {
+		vo = append(vo, reflect.ValueOf(oi))
+	}
+
+	if len(vo) > 0 {
+		// Removing limit options from path
+		path, limit = extractLimitOptions(vo[0].String())
+
+		// Writing value back without limiter "|" options
+		vo[0] = reflect.ValueOf(path)
+	}
+
+	// Calling our constructor with list of given options
+	plugin := vc.Call(vo)[0].Interface()
+	pluginWrapper := plugin
+
+	if limit != "" {
+		pluginWrapper = NewLimiter(plugin, limit)
+	} else {
+		pluginWrapper = plugin
+	}
+
+	_, isR := plugin.(io.Reader)
+	_, isW := plugin.(io.Writer)
+
+	// Some of the output can be Readers as well because return responses
+	if isR && !isW {
+		Plugins.Inputs = append(Plugins.Inputs, pluginWrapper.(io.Reader))
+	}
+
+	if isW {
+		Plugins.Outputs = append(Plugins.Outputs, pluginWrapper.(io.Writer))
+	}
+
+	Plugins.All = append(Plugins.All, plugin)
+}
+
+// InitPlugins specify and initialize all available plugins
+func InitPlugins() {
+	pluginMu.Lock()
+	defer pluginMu.Unlock()
+
+	for _, options := range Settings.inputDummy {
+		registerPlugin(NewDummyInput, options)
+	}
+
+	for range Settings.outputDummy {
+		registerPlugin(NewDummyOutput)
+	}
+
+	if Settings.outputStdout {
+		registerPlugin(NewDummyOutput)
+	}
+
+	if Settings.outputNull {
+		registerPlugin(NewNullOutput)
+	}
+
+	engine := EnginePcap
+	if Settings.inputRAWEngine == "raw_socket" {
+		engine = EngineRawSocket
+	} else if Settings.inputRAWEngine == "pcap_file" {
+		engine = EnginePcapFile
+	}
+
+	for _, options := range Settings.inputRAW {
+		registerPlugin(NewRAWInput, options, engine, Settings.inputRAWTrackResponse, time.Duration(0), Settings.inputRAWRealIPHeader)
+	}
+
+	for _, options := range Settings.inputTCP {
+		registerPlugin(NewTCPInput, options)
+	}
+
+	for _, options := range Settings.outputTCP {
+		registerPlugin(NewTCPOutput, options)
+	}
+
+	for _, options := range Settings.inputFile {
+		registerPlugin(NewFileInput, options, Settings.inputFileLoop)
+	}
+
+	for _, options := range Settings.outputFile {
+		registerPlugin(NewFileOutput, options, &Settings.outputFileConfig)
+	}
+
+	for _, options := range Settings.inputHTTP {
+		registerPlugin(NewHTTPInput, options)
+	}
+
+	// If we explicitly set Host header http output should not rewrite it
+	// Fix: https://github.com/buger/gor/issues/174
+	for _, header := range Settings.modifierConfig.headers {
+		if header.Name == "Host" {
+			Settings.outputHTTPConfig.OriginalHost = true
+			break
+		}
+	}
+
+	for _, options := range Settings.outputHTTP {
+		registerPlugin(NewHTTPOutput, options, &Settings.outputHTTPConfig)
+	}
+
+	if Settings.outputKafkaConfig.host != "" && Settings.outputKafkaConfig.topic != "" {
+		registerPlugin(NewKafkaOutput, "", &Settings.outputKafkaConfig)
+	}
+}

plugins_test.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"io"
+	"testing"
+)
+
+func TestPluginsRegistration(t *testing.T) {
+	Plugins.Inputs = []io.Reader{}
+	Plugins.Outputs = []io.Writer{}
+
+	Settings.inputDummy = MultiOption{"[]"}
+	Settings.outputDummy = MultiOption{"[]"}
+	Settings.outputHTTP = MultiOption{"www.example.com|10"}
+	Settings.inputFile = MultiOption{"/dev/null"}
+
+	InitPlugins()
+
+	if len(Plugins.Inputs) != 2 {
+		t.Errorf("Should be 2 inputs %d", len(Plugins.Inputs))
+	}
+
+	if _, ok := Plugins.Inputs[0].(*DummyInput); !ok {
+		t.Errorf("First input should be DummyInput")
+	}
+
+	if _, ok := Plugins.Inputs[1].(*FileInput); !ok {
+		t.Errorf("Second input should be FileInput")
+	}
+
+	if len(Plugins.Outputs) != 2 {
+		t.Errorf("Should be 2 output %d", len(Plugins.Outputs))
+	}
+
+	if _, ok := Plugins.Outputs[0].(*DummyOutput); !ok {
+		t.Errorf("First output should be DummyOutput")
+	}
+
+	if l, ok := Plugins.Outputs[1].(*Limiter); ok {
+		if _, ok := l.plugin.(*HTTPOutput); !ok {
+			t.Errorf("HTTPOutput should be wrapped in limiter")
+		}
+	} else {
+		t.Errorf("Second output should be Limiter")
+	}
+
+}

proto/fuzz.go

@@ -0,0 +1,12 @@
+// +build gofuzz
+
+package proto
+
+func Fuzz(data []byte) int {
+
+    ParseHeaders([][]byte{data}, func(header []byte, value []byte) bool {
+      return true
+    })
+
+    return 1
+}

proto/proto.go

@@ -0,0 +1,468 @@
+/*
+Package proto provides byte-level interaction with HTTP request payload.
+
+Example of HTTP payload for future references, new line symbols escaped:
+
+	POST /upload HTTP/1.1\r\n
+	User-Agent: Gor\r\n
+	Content-Length: 11\r\n
+	\r\n
+	Hello world
+
+	GET /index.html HTTP/1.1\r\n
+	User-Agent: Gor\r\n
+	\r\n
+	\r\n
+*/
+package proto
+
+import (
+	"bytes"
+	"github.com/buger/gor/byteutils"
+)
+
+// In HTTP newline defined by 2 bytes (for both windows and *nix support)
+var CLRF = []byte("\r\n")
+
+// New line acts as separator: end of Headers or Body (in some cases)
+var EmptyLine = []byte("\r\n\r\n")
+
+// Separator for Header line. Header looks like: `HeaderName: value`
+var HeaderDelim = []byte(": ")
+
+// MIMEHeadersEndPos finds end of the Headers section, which should end with empty line.
+func MIMEHeadersEndPos(payload []byte) int {
+	return bytes.Index(payload, EmptyLine)
+}
+
+// MIMEHeadersStartPos finds start of Headers section
+// It just finds position of second line (first contains location and method).
+func MIMEHeadersStartPos(payload []byte) int {
+	return bytes.Index(payload, CLRF) + 2 // Find first line end
+}
+
+func isLower(b byte) bool {
+	if 'a' <= b && b <= 'z' {
+		return true
+	}
+
+	return false
+}
+
+func toUpper(b byte) byte {
+	if 'a' <= b && b <= 'z' {
+		b -= 'a' - 'A'
+	}
+	return b
+}
+
+func toLower(b byte) byte {
+	if 'A' <= b && b <= 'Z' {
+		b += 'a' - 'A'
+	}
+	return b
+}
+
+func headerIndex(payload []byte, name []byte) int {
+	isLower := isLower(name[0])
+	i := 0
+
+	for {
+		if i >= len(payload) {
+			return -1
+		}
+
+		if payload[i] == '\n' {
+			i++
+
+			// We are at the end
+			if i == len(payload) {
+				return -1
+			}
+
+			if payload[i] == name[0] ||
+				(!isLower && payload[i] == toLower(name[0])) ||
+				(isLower && payload[i] == toUpper(name[0])) {
+
+				i++
+				j := 1
+				for {
+					if j == len(name) {
+						// Matched, and return start of the header
+						return i - len(name)
+					}
+
+					if payload[i] != name[j] {
+						break
+					}
+
+					// If compound header name do one more case check: Content-Length or Transfer-Encoding
+					if name[j] == '-' {
+						i++
+						j++
+
+						if !(payload[i] == name[j] ||
+							(!isLower && payload[i] == toLower(name[j])) ||
+							(isLower && payload[i] == toUpper(name[j]))) {
+							break
+						}
+					}
+
+					j++
+					i++
+				}
+			}
+		}
+
+		i++
+	}
+
+	return -1
+}
+
+// header return value and positions of header/value start/end.
+// If not found, value will be blank, and headerStart will be -1
+// Do not support multi-line headers.
+func header(payload []byte, name []byte) (value []byte, headerStart, headerEnd, valueStart, valueEnd int) {
+	headerStart = headerIndex(payload, name)
+
+	if headerStart == -1 {
+		return
+	}
+
+	valueStart = headerStart + len(name) + 1 // Skip ":" after header name
+	headerEnd = valueStart + bytes.IndexByte(payload[valueStart:], '\n')
+
+	for valueStart < headerEnd { // Ignore empty space after ':'
+		if payload[valueStart] == ' ' {
+			valueStart++
+		} else {
+			break
+		}
+	}
+
+	valueEnd = valueStart + bytes.IndexByte(payload[valueStart:], '\n')
+
+	if payload[headerEnd-1] == '\r' {
+		valueEnd--
+	}
+
+	// ignore empty space at end of header value
+	for valueStart < valueEnd {
+		if payload[valueEnd-1] == ' ' {
+			valueEnd--
+		} else {
+			break
+		}
+	}
+	value = payload[valueStart:valueEnd]
+
+	return
+}
+
+// Works only with ASCII
+func HeadersEqual(h1 []byte, h2 []byte) bool {
+	if len(h1) != len(h2) {
+		return false
+	}
+
+	for i, c1 := range h1 {
+		c2 := h2[i]
+
+		switch int(c1) - int(c2) {
+		case 0, 32, -32:
+		default:
+			return false
+		}
+	}
+
+	return true
+}
+
+// Parsing headers from multiple payloads
+func ParseHeaders(payloads [][]byte, cb func(header []byte, value []byte) bool) {
+	hS := [2]int{0, 0} // header start
+	hE := [2]int{-1, -1} // header end
+	vS := [2]int{-1, -1} // value start
+	vE := [2]int{-1, -1} // value end
+
+	i := 0
+	pIdx := 0
+	lineBreaks := 0
+	newLineBreak := true
+
+	for {
+		if len(payloads)-1 < pIdx {
+			break
+		}
+
+		p := payloads[pIdx]
+
+		if len(p)-1 < i {
+			pIdx++
+			i = 0
+			continue
+		}
+
+		switch p[i] {
+		case '\r', '\n':
+			newLineBreak = true
+			lineBreaks++
+
+			// End of headers
+			if lineBreaks == 4 {
+				return
+			}
+
+			if lineBreaks > 1 {
+				break
+			}
+
+			vE = [2]int{pIdx, i}
+
+			if vS[1] != -1 && vE[1] != -1 &&
+				hS[1] != -1 && hE[1] != -1 {
+
+				var header, value []byte
+
+				phS, phE, pvS, pvE := payloads[hS[0]], payloads[hE[0]], payloads[vS[0]], payloads[vE[0]]
+
+				// If in same payload
+				if hS[0] == hE[0] {
+					header = phS[hS[1]:hE[1]]
+				} else {
+					header = make([]byte, len(phS)-hS[1]+hE[1])
+					copy(header, phS[hS[1]:])
+					copy(header[len(phS)-hS[1]:], phE[:hE[1]])
+				}
+
+				if vS[0] == vE[0] {
+					value = pvS[vS[1]:vE[1]]
+				} else {
+					value = make([]byte, len(pvS)-vS[1]+vE[1])
+					copy(value, pvS[vS[1]:])
+					copy(value[len(pvS)-vS[1]:], pvE[:vE[1]])
+				}
+
+				if !cb(header, value) {
+					return
+				}
+			}
+
+			// Header found, reset values
+			vS = [2]int{-1, -1}
+			vE = [2]int{-1, -1}
+			hS = [2]int{-1, -1}
+			hE = [2]int{-1, -1}
+		case ':':
+			if newLineBreak {
+				hE = [2]int{pIdx, i}
+				newLineBreak = false
+			}
+			lineBreaks = 0
+		default:
+			lineBreaks = 0
+
+			if hS[1] == -1 {
+				hS = [2]int{pIdx, i}
+				hE = [2]int{-1, -1}
+			} else {
+				if hE[1] == -1 {
+					break
+				}
+
+				if vS[1] == -1 {
+					if p[i] == ' ' {
+						break
+					}
+
+					vS = [2]int{pIdx, i}
+				}
+			}
+		}
+
+		i++
+	}
+
+	return
+}
+
+// Header returns header value, if header not found, value will be blank
+func Header(payload, name []byte) []byte {
+	val, _, _, _, _ := header(payload, name)
+
+	return val
+}
+
+// SetHeader sets header value. If header not found it creates new one.
+// Returns modified request payload
+func SetHeader(payload, name, value []byte) []byte {
+	_, hs, _, vs, ve := header(payload, name)
+
+	if hs != -1 {
+		// If header found we just replace its value
+		return byteutils.Replace(payload, vs, ve, value)
+	}
+
+	return AddHeader(payload, name, value)
+}
+
+// AddHeader takes http payload and appends new header to the start of headers section
+// Returns modified request payload
+func AddHeader(payload, name, value []byte) []byte {
+	header := make([]byte, len(name)+2+len(value)+2)
+	copy(header[0:], name)
+	copy(header[len(name):], HeaderDelim)
+	copy(header[len(name)+2:], value)
+	copy(header[len(header)-2:], CLRF)
+
+	mimeStart := MIMEHeadersStartPos(payload)
+
+	return byteutils.Insert(payload, mimeStart, header)
+}
+
+// DelHeader takes http payload and removes header name from headers section
+// Returns modified request payload
+func DeleteHeader(payload, name []byte) []byte {
+	_, hs, he, _, _ := header(payload, name)
+	if hs != -1 {
+		newHeader := make([]byte, len(payload)-(he-hs)-1)
+		copy(newHeader[:hs], payload[:hs])
+		copy(newHeader[hs:], payload[he+1:])
+		return newHeader
+	}
+	return payload
+}
+
+// Body returns request/response body
+func Body(payload []byte) []byte {
+	// 4 -> len(EMPTY_LINE)
+	return payload[MIMEHeadersEndPos(payload)+4:]
+}
+
+// Path takes payload and retuns request path: Split(firstLine, ' ')[1]
+func Path(payload []byte) []byte {
+	start := bytes.IndexByte(payload, ' ') + 1
+	end := bytes.IndexByte(payload[start:], ' ')
+
+	return payload[start : start+end]
+}
+
+// SetPath takes payload, sets new path and returns modified payload
+func SetPath(payload, path []byte) []byte {
+	start := bytes.IndexByte(payload, ' ') + 1
+	end := bytes.IndexByte(payload[start:], ' ')
+
+	return byteutils.Replace(payload, start, start+end, path)
+}
+
+// PathParam returns URL query attribute by given name, if no found: valueStart will be -1
+func PathParam(payload, name []byte) (value []byte, valueStart, valueEnd int) {
+	path := Path(payload)
+
+	if paramStart := bytes.Index(path, append(name, '=')); paramStart != -1 {
+		valueStart := paramStart + len(name) + 1
+		paramEnd := bytes.IndexByte(path[valueStart:], '&')
+
+		// Param can end with '&' (another param), or end of line
+		if paramEnd == -1 { // It is final param
+			paramEnd = len(path)
+		} else {
+			paramEnd += valueStart
+		}
+
+		return path[valueStart:paramEnd], valueStart, paramEnd
+	}
+
+	return []byte(""), -1, -1
+}
+
+// SetPathParam takes payload and updates path Query attribute
+// If query param not found, it will append new
+// Returns modified payload
+func SetPathParam(payload, name, value []byte) []byte {
+	path := Path(payload)
+	_, vs, ve := PathParam(payload, name)
+
+	if vs != -1 { // If param found, replace its value and set new Path
+		newPath := make([]byte, len(path))
+		copy(newPath, path)
+		newPath = byteutils.Replace(newPath, vs, ve, value)
+
+		return SetPath(payload, newPath)
+	}
+
+	// if param not found append to end of url
+	// Adding 2 because of '?' or '&' at start, and '=' in middle
+	newParam := make([]byte, len(name)+len(value)+2)
+
+	if bytes.IndexByte(path, '?') == -1 {
+		newParam[0] = '?'
+	} else {
+		newParam[0] = '&'
+	}
+
+	// Copy "param=value" into buffer, after it looks like "?param=value"
+	copy(newParam[1:], name)
+	newParam[1+len(name)] = '='
+	copy(newParam[2+len(name):], value)
+
+	// Append param to the end of path
+	newPath := make([]byte, len(path)+len(newParam))
+	copy(newPath, path)
+	copy(newPath[len(path):], newParam)
+
+	return SetPath(payload, newPath)
+}
+
+// SetHost updates Host header for HTTP/1.1 or updates host in path for HTTP/1.0 or Proxy requests
+// Returns modified payload
+func SetHost(payload, url, host []byte) []byte {
+	// If this is HTTP 1.0 traffic or proxy traffic it may include host right into path variable, so instead of setting Host header we rewrite Path
+	// Fix for https://github.com/buger/gor/issues/156
+	if path := Path(payload); bytes.HasPrefix(path, []byte("http")) {
+		hostStart := bytes.IndexByte(path, ':') // : position "https?:"
+		hostStart += 3                          // Skip 1 ':' and 2 '\'
+		hostEnd := hostStart + bytes.IndexByte(path[hostStart:], '/')
+
+		newPath := make([]byte, len(path))
+		copy(newPath, path)
+		newPath = byteutils.Replace(newPath, 0, hostEnd, url)
+
+		return SetPath(payload, newPath)
+	}
+
+	return SetHeader(payload, []byte("Host"), host)
+}
+
+// Method returns HTTP method
+func Method(payload []byte) []byte {
+	end := bytes.IndexByte(payload, ' ')
+
+	return payload[:end]
+}
+
+// Status returns response status.
+// It happend to be in same position as request payload path
+func Status(payload []byte) []byte {
+	return Path(payload)
+}
+
+var httpMethods []string = []string{
+	"GET ", "OPTI", "HEAD", "POST", "PUT ", "DELE", "TRAC", "CONN", "PATC" /* custom methods */, "BAN", "PURG",
+}
+
+func IsHTTPPayload(payload []byte) bool {
+	if len(payload) < 4 {
+		return false
+	}
+
+	method := string(payload[0:4])
+
+	for _, m := range httpMethods {
+		if method == m {
+			return true
+		}
+	}
+	return false
+}

proto/proto_test.go

@@ -0,0 +1,308 @@
+package proto
+
+import (
+	"bytes"
+	"reflect"
+	"testing"
+)
+
+func TestHeader(t *testing.T) {
+	var payload, val []byte
+	var headerStart int
+
+	// Value with space at start
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find header value")
+	}
+
+	// Value with space at end
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7 \r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find header value without space after 7")
+	}
+
+	// Value without space at start
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length:7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find header value without space after :")
+	}
+
+	// Value is empty
+	payload = []byte("GET /p HTTP/1.1\r\nCookie:\r\nHost: www.w3.org\r\n\r\n")
+
+	if val = Header(payload, []byte("Cookie")); len(val) > 0 {
+		t.Error("Should return empty value")
+	}
+
+	// Wrong delimeter
+	payload = []byte("GET /p HTTP/1.1\r\nCookie: 123\nHost: www.w3.org\r\n\r\n")
+
+	if val = Header(payload, []byte("Cookie")); !bytes.Equal(val, []byte("123")) {
+		t.Error("Should handle wrong header delimeter")
+	}
+
+	// Header not found
+	if _, headerStart, _, _, _ = header(payload, []byte("Not-Found")); headerStart != -1 {
+		t.Error("Should not found header")
+	}
+
+	// Lower case headers
+	payload = []byte("POST /post HTTP/1.1\r\ncontent-length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find lower case 2 word header")
+	}
+
+	payload = []byte("POST /post HTTP/1.1\r\ncontent-length: 7\r\nhost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("host")); !bytes.Equal(val, []byte("www.w3.org")) {
+		t.Error("Should find lower case 1 word header")
+	}
+}
+
+func TestMIMEHeadersEndPos(t *testing.T) {
+	head := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org")
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	end := MIMEHeadersEndPos(payload)
+
+	if !bytes.Equal(payload[:end], head) {
+		t.Error("Wrong headers end position:", end)
+	}
+}
+
+func TestMIMEHeadersStartPos(t *testing.T) {
+	headers := []byte("Content-Length: 7\r\nHost: www.w3.org")
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	start := MIMEHeadersStartPos(payload)
+	end := MIMEHeadersEndPos(payload)
+
+	if !bytes.Equal(payload[start:end], headers) {
+		t.Error("Wrong headers end position:", start, end)
+	}
+}
+
+func TestSetHeader(t *testing.T) {
+	var payload, payloadAfter []byte
+
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post HTTP/1.1\r\nContent-Length: 14\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetHeader(payload, []byte("Content-Length"), []byte("14")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should update header if it exists", string(payload))
+	}
+
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post HTTP/1.1\r\nUser-Agent: Gor\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetHeader(payload, []byte("User-Agent"), []byte("Gor")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should add header if not found", string(payload))
+	}
+}
+
+func TestDeleteHeader(t *testing.T) {
+	var payload, payloadAfter []byte
+
+	payload = []byte("POST /post HTTP/1.1\r\nUser-Agent: Gor\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = DeleteHeader(payload, []byte("User-Agent")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should delete header if found", string(payload), string(payloadAfter))
+	}
+
+	//Whitespace at end of User-Agent
+	payload = []byte("POST /post HTTP/1.1\r\nUser-Agent: Gor \r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = DeleteHeader(payload, []byte("User-Agent")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should delete header if found", string(payload), string(payloadAfter))
+	}
+}
+
+func TestParseHeaders(t *testing.T) {
+	payload := [][]byte{[]byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.or"), []byte("g\r\nUser-Ag"), []byte("ent:Chrome\r\n\r\n"), []byte("Fake-Header: asda")}
+
+	headers := make(map[string]string)
+
+	ParseHeaders(payload, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	expected := map[string]string{
+		"Content-Length": "7",
+		"Host":           "www.w3.org",
+		"User-Agent":     "Chrome",
+	}
+
+	if !reflect.DeepEqual(headers, expected) {
+		t.Error("Headers do not properly parsed", headers)
+	}
+}
+
+// See https://github.com/dvyukov/go-fuzz and fuzz.go
+func TestFuzzCrashers(t *testing.T) {
+	var crashers = []string{
+		"\n:00\n",
+	}
+
+	for _, f := range crashers {
+		ParseHeaders([][]byte{[]byte(f)}, func(header []byte, value []byte) bool {
+	      return true
+	    })
+	}
+}
+
+func TestParseHeadersWithComplexUserAgent(t *testing.T) {
+	// User-Agent could contain inside ':'
+	// Parser should wait for \r\n
+	payload := [][]byte{[]byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.or"), []byte("g\r\nUser-Ag"), []byte("ent:Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko\r\n\r\n"), []byte("Fake-Header: asda")}
+
+	headers := make(map[string]string)
+
+	ParseHeaders(payload, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	expected := map[string]string{
+		"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko",
+	}
+
+	if expected["User-Agent"] != headers["User-Agent"] {
+		t.Errorf("Header 'User-Agent' expected '%s' and parsed: '%s'", expected["User-Agent"], headers["User-Agent"])
+	}
+}
+
+func TestParseHeadersWithOrigin(t *testing.T) {
+	// User-Agent could contain inside ':'
+	// Parser should wait for \r\n
+	payload := [][]byte{[]byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.or"), []byte("g\r\nReferrer: http://127.0.0.1:3000\r\nOrigi"), []byte("n: https://www.example.com\r\nUser-Ag"), []byte("ent:Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko\r\n\r\n"), []byte("in:https://www.example.com\r\n\r\n"), []byte("Fake-Header: asda")}
+
+	headers := make(map[string]string)
+
+	ParseHeaders(payload, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	expected := map[string]string{
+		"Origin":     "https://www.example.com",
+		"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko",
+		"Referrer":   "http://127.0.0.1:3000",
+	}
+
+	if expected["Referrer"] != headers["Referrer"] {
+		t.Errorf("Header 'Referrer' expected '%s' and parsed: '%s'", expected["Referrer"], headers["Referrer"])
+	}
+
+	if expected["Origin"] != headers["Origin"] {
+		t.Errorf("Header 'Origin' expected '%s' and parsed: '%s'", expected["Origin"], headers["Origin"])
+	}
+
+	if expected["User-Agent"] != headers["User-Agent"] {
+		t.Errorf("Header 'User-Agent' expected '%s' and parsed: '%s'", expected["User-Agent"], headers["User-Agent"])
+	}
+}
+
+func TestHeaderEquals(t *testing.T) {
+	tests := []struct {
+		h1     string
+		h2     string
+		equals bool
+	}{
+		{"Content-Length", "content-length", true},
+		{"content-length", "Content-Length", true},
+		{"content-Pength", "Content-Length", false},
+		{"Host", "Content-Length", false},
+	}
+
+	for _, tc := range tests {
+		if HeadersEqual([]byte(tc.h1), []byte(tc.h2)) != tc.equals {
+			t.Error(tc)
+		}
+	}
+}
+
+func TestPath(t *testing.T) {
+	var path, payload []byte
+
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if path = Path(payload); !bytes.Equal(path, []byte("/post")) {
+		t.Error("Should find path", string(path))
+	}
+}
+
+func TestSetPath(t *testing.T) {
+	var payload, payloadAfter []byte
+
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /new_path HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetPath(payload, []byte("/new_path")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace path", string(payload))
+	}
+}
+
+func TestPathParam(t *testing.T) {
+	var payload []byte
+
+	payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val, _, _ := PathParam(payload, []byte("param")); !bytes.Equal(val, []byte("test")) {
+		t.Error("Should detect attribute", string(val))
+	}
+
+	if val, _, _ := PathParam(payload, []byte("user_id")); !bytes.Equal(val, []byte("1")) {
+		t.Error("Should detect attribute", string(val))
+	}
+}
+
+func TestSetPathParam(t *testing.T) {
+	var payload, payloadAfter []byte
+
+	payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post?param=new&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetPathParam(payload, []byte("param"), []byte("new")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace existing value", string(payload))
+	}
+
+	payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post?param=test&user_id=2 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetPathParam(payload, []byte("user_id"), []byte("2")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace existing value", string(payload))
+	}
+
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post?param=test HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetPathParam(payload, []byte("param"), []byte("test")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should set param if url have no params", string(payload))
+	}
+
+	payload = []byte("POST /post?param=test HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetPathParam(payload, []byte("user_id"), []byte("1")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should set param at the end if url params", string(payload))
+	}
+}
+
+func TestSetHostHTTP10(t *testing.T) {
+	var payload, payloadAfter []byte
+
+	payload = []byte("POST http://example.com/post HTTP/1.0\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST http://new.com/post HTTP/1.0\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = SetHost(payload, []byte("http://new.com"), []byte("new.com")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace host", string(payload))
+	}
+}

protocol.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"strconv"
+)
+
+const (
+	RequestPayload          = '1'
+	ResponsePayload         = '2'
+	ReplayedResponsePayload = '3'
+)
+
+func uuid() []byte {
+	b := make([]byte, 20)
+	rand.Read(b)
+
+	uuid := make([]byte, 40)
+	hex.Encode(uuid, b)
+
+	return uuid
+}
+
+var payloadSeparator = "\n🐵🙈🙉\n"
+
+func payloadScanner(data []byte, atEOF bool) (advance int, token []byte, err error) {
+	if atEOF && len(data) == 0 {
+		return 0, nil, nil
+	}
+
+	if i := bytes.Index(data, []byte(payloadSeparator)); i >= 0 {
+		// We have a full newline-terminated line.
+		return i + len([]byte(payloadSeparator)), data[0:i], nil
+	}
+
+	if atEOF {
+		return len(data), data, nil
+	}
+	return 0, nil, nil
+}
+
+// Timing is request start or round-trip time, depending on payloadType
+func payloadHeader(payloadType byte, uuid []byte, timing int64, latency int64) (header []byte) {
+	var sTime, sLatency string
+
+	sTime = strconv.FormatInt(timing, 10)
+	if latency != -1 {
+		sLatency = strconv.FormatInt(latency, 10)
+	}
+
+	//Example:
+	//  3 f45590522cd1838b4a0d5c5aab80b77929dea3b3 1231\n
+	// `+ 1` indicates space characters or end of line
+	headerLen := 1 + 1 + len(uuid) + 1 + len(sTime) + 1
+
+	if latency != -1 {
+		headerLen += len(sLatency) + 1
+	}
+
+	header = make([]byte, headerLen)
+	header[0] = payloadType
+	header[1] = ' '
+	header[2+len(uuid)] = ' '
+	header[len(header)-1] = '\n'
+
+	copy(header[2:], uuid)
+	copy(header[3+len(uuid):], sTime)
+
+	if latency != -1 {
+		header[3+len(uuid)+len(sTime)] = ' '
+		copy(header[4+len(uuid)+len(sTime):], sLatency)
+	}
+
+	return header
+}
+
+func payloadBody(payload []byte) []byte {
+	headerSize := bytes.IndexByte(payload, '\n')
+	return payload[headerSize+1:]
+}
+
+func payloadMeta(payload []byte) [][]byte {
+	headerSize := bytes.IndexByte(payload, '\n')
+	if headerSize < 0 {
+		headerSize = 0
+	}
+	return bytes.Split(payload[:headerSize], []byte{' '})
+}
+
+func isOriginPayload(payload []byte) bool {
+	switch payload[0] {
+	case RequestPayload, ResponsePayload:
+		return true
+	default:
+		return false
+	}
+}
+
+func isRequestPayload(payload []byte) bool {
+	return payload[0] == RequestPayload
+}

raw_socket_listener/listener.go

@@ -0,0 +1,842 @@
+/*
+Package rawSocket provides traffic sniffier using RAW sockets.
+
+Capture traffic from socket using RAW_SOCKET's
+http://en.wikipedia.org/wiki/Raw_socket
+
+RAW_SOCKET allow you listen for traffic on any port (e.g. sniffing) because they operate on IP level.
+
+Ports is TCP feature, same as flow control, reliable transmission and etc.
+
+This package implements own TCP layer: TCP packets is parsed using tcp_packet.go, and flow control is managed by tcp_message.go
+*/
+package rawSocket
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"github.com/buger/gor/proto"
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/google/gopacket/pcap"
+	"io"
+	"log"
+	"net"
+	"runtime"
+	"runtime/debug"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+var _ = fmt.Println
+
+type packet struct {
+	srcIP		[]byte
+	data		[]byte
+	timestamp	time.Time
+}
+
+// Listener handle traffic capture
+type Listener struct {
+	mu sync.Mutex
+	// buffer of TCPMessages waiting to be send
+	// ID -> TCPMessage
+	messages map[tcpID]*TCPMessage
+
+	// Expect: 100-continue request is send in 2 tcp messages
+	// We store ACK aliases to merge this packets together
+	ackAliases map[uint32]uint32
+	// To get ACK of second message we need to compute its Seq and wait for them message
+	seqWithData map[uint32]uint32
+
+	// Ack -> Req
+	respAliases map[uint32]*TCPMessage
+
+	// Ack -> ID
+	respWithoutReq map[uint32]tcpID
+
+	// Messages ready to be send to client
+	packetsChan chan *packet
+
+	// Messages ready to be send to client
+	messagesChan chan *TCPMessage
+
+	addr string // IP to listen
+	port uint16 // Port to listen
+
+	trackResponse bool
+	messageExpire time.Duration
+
+	conn        net.PacketConn
+	pcapHandles []*pcap.Handle
+
+	quit    chan bool
+	readyCh chan bool
+}
+
+type request struct {
+	id    tcpID
+	start time.Time
+	ack   uint32
+}
+
+// Available engines for intercepting traffic
+const (
+	EngineRawSocket = 1 << iota
+	EnginePcap
+	EnginePcapFile
+)
+
+// NewListener creates and initializes new Listener object
+func NewListener(addr string, port string, engine int, trackResponse bool, expire time.Duration) (l *Listener) {
+	l = &Listener{}
+
+	l.packetsChan = make(chan *packet, 10000)
+	l.messagesChan = make(chan *TCPMessage, 10000)
+	l.quit = make(chan bool)
+	l.readyCh = make(chan bool, 1)
+
+	l.messages = make(map[tcpID]*TCPMessage)
+	l.ackAliases = make(map[uint32]uint32)
+	l.seqWithData = make(map[uint32]uint32)
+	l.respAliases = make(map[uint32]*TCPMessage)
+	l.respWithoutReq = make(map[uint32]tcpID)
+	l.trackResponse = trackResponse
+
+	l.addr = addr
+	_port, _ := strconv.Atoi(port)
+	l.port = uint16(_port)
+
+	if expire.Nanoseconds() == 0 {
+		expire = 2000 * time.Millisecond
+	}
+
+	l.messageExpire = expire
+
+	go l.listen()
+
+	// Special case for testing
+	if l.port != 0 {
+		switch engine {
+		case EnginePcap:
+			go l.readPcap()
+		case EnginePcapFile:
+			go l.readPcapFile()
+		default:
+			log.Fatal("Unknown traffic interception engine:", engine)
+		}
+	}
+
+	return
+}
+
+func (t *Listener) listen() {
+	gcTicker := time.Tick(t.messageExpire / 2)
+
+	for {
+		select {
+		case <-t.quit:
+			if t.conn != nil {
+				t.conn.Close()
+			}
+			return
+		case packet := <-t.packetsChan:
+			tcpPacket := ParseTCPPacket(packet.srcIP, packet.data, packet.timestamp)
+			t.processTCPPacket(tcpPacket)
+		case <-gcTicker:
+			now := time.Now()
+
+			// Dispatch requests before responses
+			for _, message := range t.messages {
+				if now.Sub(message.End) >= t.messageExpire {
+					t.dispatchMessage(message)
+				}
+			}
+		}
+	}
+}
+
+func (t *Listener) deleteMessage(message *TCPMessage) {
+	delete(t.messages, message.ID())
+	delete(t.ackAliases, message.Ack)
+	if message.DataAck != 0 {
+		delete(t.ackAliases, message.DataAck)
+	}
+	if message.DataSeq != 0 {
+		delete(t.seqWithData, message.DataSeq)
+	}
+
+	delete(t.respAliases, message.ResponseAck)
+}
+
+func (t *Listener) dispatchMessage(message *TCPMessage) {
+	// If already dispatched
+	if _, ok := t.messages[message.ID()]; !ok {
+		return
+	}
+
+	t.deleteMessage(message)
+
+	if !message.complete {
+		if !message.IsIncoming {
+			delete(t.respAliases, message.Ack)
+			delete(t.respWithoutReq, message.Ack)
+		}
+
+		return
+	}
+
+	if message.IsIncoming {
+		// If there were response before request
+		// log.Println("Looking for Response: ", t.respWithoutReq, message.ResponseAck)
+		if t.trackResponse {
+			if respID, ok := t.respWithoutReq[message.ResponseAck]; ok {
+				if resp, rok := t.messages[respID]; rok {
+					// if resp.AssocMessage == nil {
+					// log.Println("FOUND RESPONSE")
+					resp.setAssocMessage(message)
+					message.setAssocMessage(resp)
+
+					if resp.complete {
+						defer t.dispatchMessage(resp)
+					}
+					// }
+				}
+			}
+
+			if resp, ok := t.messages[message.ResponseID]; ok {
+				resp.setAssocMessage(message)
+			}
+		}
+	} else {
+		if message.AssocMessage == nil {
+			if responseRequest, ok := t.respAliases[message.Ack]; ok {
+				message.setAssocMessage(responseRequest)
+				responseRequest.setAssocMessage(message)
+			}
+		}
+
+		delete(t.respAliases, message.Ack)
+		delete(t.respWithoutReq, message.Ack)
+
+		// Do not track responses which have no associated requests
+		if message.AssocMessage == nil {
+			// log.Println("Can't dispatch resp", message.Seq, message.Ack, string(message.Bytes()))
+			return
+		}
+	}
+
+	t.messagesChan <- message
+}
+
+// DeviceNotFoundError raised if user specified wrong ip
+type DeviceNotFoundError struct {
+	addr string
+}
+
+func (e *DeviceNotFoundError) Error() string {
+	devices, _ := pcap.FindAllDevs()
+
+	if len(devices) == 0 {
+		return "Can't get list of network interfaces, ensure that you running Gor as root user or sudo.\nTo run as non-root users see this docs https://github.com/buger/gor/wiki/Running-as-non-root-user"
+	}
+
+	var msg string
+	msg += "Can't find interfaces with addr: " + e.addr + ". Provide available IP for intercepting traffic: \n"
+	for _, device := range devices {
+		msg += "Name: " + device.Name + "\n"
+		if device.Description != "" {
+			msg += "Description: " + device.Description + "\n"
+		}
+		for _, address := range device.Addresses {
+			msg += "- IP address: " + address.IP.String() + "\n"
+		}
+	}
+
+	return msg
+}
+
+func isLoopback(device pcap.Interface) bool {
+	if len(device.Addresses) == 0 {
+		return false
+	}
+
+	switch device.Addresses[0].IP.String() {
+	case "127.0.0.1", "::1":
+		return true
+	}
+
+	return false
+}
+
+func listenAllInterfaces(addr string) bool {
+	switch addr {
+	case "", "0.0.0.0", "[::]", "::":
+		return true
+	default:
+		return false
+	}
+}
+
+func findPcapDevices(addr string) (interfaces []pcap.Interface, err error) {
+	devices, err := pcap.FindAllDevs()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, device := range devices {
+		if listenAllInterfaces(addr) && len(device.Addresses) > 0 || isLoopback(device) {
+			interfaces = append(interfaces, device)
+			continue
+		}
+
+		for _, address := range device.Addresses {
+			if device.Name == addr || address.IP.String() == addr {
+				interfaces = append(interfaces, device)
+				return interfaces, nil
+			}
+		}
+	}
+
+	if len(interfaces) == 0 {
+		return nil, &DeviceNotFoundError{addr}
+	} else {
+		return interfaces, nil
+	}
+}
+
+func (t *Listener) readPcap() {
+	devices, err := findPcapDevices(t.addr)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	bpfSupported := true
+	if runtime.GOOS == "darwin" {
+		bpfSupported = false
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(len(devices))
+
+	for _, d := range devices {
+		go func(device pcap.Interface) {
+			handle, err := pcap.OpenLive(device.Name, 65536, true, t.messageExpire)
+			if err != nil {
+				log.Println("Pcap Error while opening device", device.Name, err)
+				wg.Done()
+				return
+			}
+			defer handle.Close()
+
+			t.mu.Lock()
+			t.pcapHandles = append(t.pcapHandles, handle)
+
+			var bpfDstHost, bpfSrcHost string
+			var loopback = isLoopback(device)
+
+			if loopback {
+				var allAddr []string
+				for _, dc := range devices {
+					for _, addr := range dc.Addresses {
+						allAddr = append(allAddr, "(dst host "+addr.IP.String()+" and src host "+addr.IP.String()+")")
+					}
+				}
+
+				bpfDstHost = strings.Join(allAddr, " or ")
+				bpfSrcHost = bpfDstHost
+			} else {
+				for i, addr := range device.Addresses {
+					bpfDstHost += "dst host " + addr.IP.String()
+					bpfSrcHost += "src host " + addr.IP.String()
+					if i != len(device.Addresses)-1 {
+						bpfDstHost += " or "
+						bpfSrcHost += " or "
+					}
+				}
+			}
+
+			if bpfSupported {
+				var bpf string
+
+				if t.trackResponse {
+					bpf = "(tcp dst port " + strconv.Itoa(int(t.port)) + " and (" + bpfDstHost + ")) or (" + "tcp src port " + strconv.Itoa(int(t.port)) + " and (" + bpfSrcHost + "))"
+				} else {
+					bpf = "tcp dst port " + strconv.Itoa(int(t.port)) + " and (" + bpfDstHost + ")"
+				}
+
+				if err := handle.SetBPFFilter(bpf); err != nil {
+					log.Println("BPF filter error:", err, "Device:", device.Name, bpf)
+					wg.Done()
+					return
+				}
+			}
+			t.mu.Unlock()
+
+			var decoder gopacket.Decoder
+
+			// Special case for tunnel interface https://github.com/google/gopacket/issues/99
+			if handle.LinkType() == 12 {
+				decoder = layers.LayerTypeIPv4
+			} else {
+				decoder = handle.LinkType()
+			}
+
+			source := gopacket.NewPacketSource(handle, decoder)
+			source.Lazy = true
+			source.NoCopy = true
+
+			wg.Done()
+
+			var data, srcIP, dstIP []byte
+
+			for {
+				packet, err := source.NextPacket()
+
+				if err == io.EOF {
+					break
+				} else if err != nil {
+					continue
+				}
+
+				// We should remove network layer before parsing TCP/IP data
+				var of int
+				switch decoder {
+				case layers.LinkTypeEthernet:
+					of = 14
+				case layers.LinkTypePPP:
+					of = 1
+				case layers.LinkTypeFDDI:
+					of = 13
+				case layers.LinkTypeNull:
+					of = 4
+				case layers.LinkTypeLoop:
+					of = 4
+				case layers.LinkTypeRaw:
+					of = 0
+				case layers.LinkTypeLinuxSLL:
+					of = 16
+				default:
+					log.Println("Unknown packet layer", packet)
+					break
+				}
+
+				data = packet.Data()[of:]
+
+				version := uint8(data[0]) >> 4
+				ipLength := int(binary.BigEndian.Uint16(data[2:4]))
+
+				if version == 4 {
+					ihl := uint8(data[0]) & 0x0F
+
+					// Truncated IP info
+					if len(data) < int(ihl*4) {
+						continue
+					}
+
+					srcIP = data[12:16]
+					dstIP = data[16:20]
+
+					// Too small IP packet
+					if ipLength < 20 {
+						continue
+					}
+
+					// Invalid length
+					if int(ihl*4) > ipLength {
+						continue
+					}
+
+					if cmp := len(data) - ipLength; cmp > 0 {
+						data = data[:ipLength]
+					} else if cmp < 0 {
+						// Truncated packet
+						continue
+					}
+
+					data = data[ihl*4:]
+				} else {
+					// Truncated IP info
+					if len(data) < 40 {
+						continue
+					}
+
+					srcIP = data[8:24]
+					dstIP = data[24:40]
+
+					data = data[40:]
+				}
+
+				// Truncated TCP info
+				if len(data) <= 13 {
+					continue
+				}
+
+				dataOffset := (data[12] & 0xF0) >> 4
+				isFIN := data[13]&0x01 != 0
+
+				// We need only packets with data inside
+				// Check that the buffer is larger than the size of the TCP header
+				if len(data) > int(dataOffset*4) || isFIN {
+					if !bpfSupported {
+						destPort := binary.BigEndian.Uint16(data[2:4])
+						srcPort := binary.BigEndian.Uint16(data[0:2])
+
+						var addrCheck []byte
+
+						if destPort == t.port {
+							addrCheck = dstIP
+						}
+
+						if t.trackResponse && srcPort == t.port {
+							addrCheck = srcIP
+						}
+
+						if len(addrCheck) == 0 {
+							continue
+						}
+
+						addrMatched := false
+
+						if loopback {
+							for _, dc := range devices {
+								if addrMatched {
+									break
+								}
+								for _, a := range dc.Addresses {
+									if a.IP.Equal(net.IP(addrCheck)) {
+										addrMatched = true
+										break
+									}
+								}
+							}
+							addrMatched = true
+						} else {
+							for _, a := range device.Addresses {
+								if a.IP.Equal(net.IP(addrCheck)) {
+									addrMatched = true
+									break
+								}
+							}
+						}
+
+						if !addrMatched {
+							continue
+						}
+					}
+
+					t.packetsChan <- t.buildPacket(srcIP, data, packet.Metadata().Timestamp)
+				}
+			}
+		}(d)
+	}
+
+	wg.Wait()
+	t.readyCh <- true
+}
+
+func (t *Listener) readPcapFile() {
+	if handle, err := pcap.OpenOffline(t.addr); err != nil {
+		log.Fatal(err)
+	} else {
+		t.readyCh <- true
+		packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
+
+		for {
+			packet, err := packetSource.NextPacket()
+			if err == io.EOF {
+				break
+			} else if err != nil {
+				log.Println("Error:", err)
+				continue
+			}
+
+			var addr, data []byte
+
+			if tcpLayer := packet.Layer(layers.LayerTypeTCP); tcpLayer != nil {
+				tcp, _ := tcpLayer.(*layers.TCP)
+				data = append(tcp.LayerContents(), tcp.LayerPayload()...)
+
+				if tcp.SrcPort >= 32768 && tcp.SrcPort <= 61000 {
+					copy(data[0:2], []byte{0, 0})
+					copy(data[2:4], []byte{0, 1})
+				} else {
+					copy(data[0:2], []byte{0, 1})
+					copy(data[2:4], []byte{0, 0})
+				}
+			} else {
+				continue
+			}
+
+			if ipLayer := packet.Layer(layers.LayerTypeIPv4); ipLayer != nil {
+				ip, _ := ipLayer.(*layers.IPv4)
+				addr = ip.SrcIP
+			} else if ipLayer = packet.Layer(layers.LayerTypeIPv6); ipLayer != nil {
+				ip, _ := ipLayer.(*layers.IPv6)
+				addr = ip.SrcIP
+			} else {
+				// log.Println("Can't find IP layer", packet)
+				continue
+			}
+
+			dataOffset := (data[12] & 0xF0) >> 4
+			isFIN := data[13]&0x01 != 0
+
+			// We need only packets with data inside
+			// Check that the buffer is larger than the size of the TCP header
+			if len(data) <= int(dataOffset*4) && !isFIN {
+				continue
+			}
+
+			t.packetsChan <- t.buildPacket(addr, data, packet.Metadata().Timestamp)
+		}
+	}
+}
+
+func (t *Listener) readRAWSocket() {
+	conn, e := net.ListenPacket("ip:tcp", t.addr)
+	t.conn = conn
+
+	if e != nil {
+		log.Fatal(e)
+	}
+
+	defer t.conn.Close()
+
+	buf := make([]byte, 64*1024) // 64kb
+
+	t.readyCh <- true
+
+	for {
+		// Note: ReadFrom receive messages without IP header
+		n, addr, err := t.conn.ReadFrom(buf)
+
+		if err != nil {
+			if strings.HasSuffix(err.Error(), "closed network connection") {
+				return
+			} else {
+				continue
+			}
+		}
+
+		if n > 0 {
+			if t.isValidPacket(buf[:n]) {
+				t.packetsChan <- t.buildPacket([]byte(addr.(*net.IPAddr).IP), buf[:n], time.Now())
+			}
+		}
+	}
+}
+
+func (t *Listener) buildPacket(packetSrcIP []byte, packetData []byte, timestamp time.Time) *packet {
+	copyPacketSrcIP := make([]byte, 16)
+	copyPacketData := make([]byte, len(packetData))
+
+	copy(copyPacketSrcIP, packetSrcIP)
+	copy(copyPacketData, packetSrcIP)
+
+	return &packet{
+		srcIP: packetSrcIP,
+		data: packetData,
+		timestamp:timestamp,
+	}
+}
+
+func (t *Listener) isValidPacket(buf []byte) bool {
+	// To avoid full packet parsing every time, we manually parsing values needed for packet filtering
+	// http://en.wikipedia.org/wiki/Transmission_Control_Protocol
+	destPort := binary.BigEndian.Uint16(buf[2:4])
+	srcPort := binary.BigEndian.Uint16(buf[0:2])
+
+	// Because RAW_SOCKET can't be bound to port, we have to control it by ourself
+	if destPort == t.port || (t.trackResponse && srcPort == t.port) {
+		// Get the 'data offset' (size of the TCP header in 32-bit words)
+		dataOffset := (buf[12] & 0xF0) >> 4
+
+		// We need only packets with data inside
+		// Check that the buffer is larger than the size of the TCP header
+		if len(buf) > int(dataOffset*4) {
+			// We should create new buffer because go slices is pointers. So buffer data shoud be immutable.
+			return true
+		}
+	}
+
+	return false
+}
+
+// Trying to add packet to existing message or creating new message
+//
+// For TCP message unique id is Acknowledgment number (see tcp_packet.go)
+func (t *Listener) processTCPPacket(packet *TCPPacket) {
+	// Don't exit on panic
+	defer func() {
+		if r := recover(); r != nil {
+			log.Println("PANIC: pkg:", r, packet, string(debug.Stack()))
+		}
+	}()
+
+	var message *TCPMessage
+
+	isIncoming := packet.DestPort == t.port
+
+	// Seek for 100-expect chunks
+	if parentAck, ok := t.seqWithData[packet.Seq]; ok {
+		// In case if non-first data chunks comes first
+		for _, m := range t.messages {
+			if m.Ack == packet.Ack && bytes.Equal(m.packets[0].Addr, packet.Addr) {
+				t.deleteMessage(m)
+
+				if m.AssocMessage != nil {
+					m.setAssocMessage(nil)
+				}
+
+				for _, pkt := range m.packets {
+					// log.Println("Updating ack", parentAck, pkt.Ack)
+					pkt.UpdateAck(parentAck)
+					// Re-queue this packets
+					t.processTCPPacket(pkt)
+				}
+			}
+		}
+
+		t.ackAliases[packet.Ack] = parentAck
+		packet.UpdateAck(parentAck)
+	}
+
+	if isIncoming && packet.IsFIN {
+		if ma, ok := t.respAliases[packet.Seq]; ok {
+			if ma.packets[0].SrcPort == packet.SrcPort {
+				packet.UpdateAck(ma.Ack)
+			}
+		}
+	}
+
+	if alias, ok := t.ackAliases[packet.Ack]; ok {
+		packet.UpdateAck(alias)
+	}
+
+	var responseRequest *TCPMessage
+
+	if !isIncoming {
+		responseRequest, _ = t.respAliases[packet.Ack]
+	}
+
+	message, ok := t.messages[packet.ID]
+
+	if !ok {
+		message = NewTCPMessage(packet.Seq, packet.Ack, isIncoming, packet.timestamp)
+		t.messages[packet.ID] = message
+
+		if !isIncoming {
+			if responseRequest != nil {
+				message.setAssocMessage(responseRequest)
+				responseRequest.setAssocMessage(message)
+			} else {
+				t.respWithoutReq[packet.Ack] = packet.ID
+			}
+		}
+	}
+
+	// Adding packet to message
+	message.AddPacket(packet)
+
+	// Handling Expect: 100-continue requests
+	if message.expectType == httpExpect100Continue && len(message.packets) == message.headerPacket+1 {
+		seq := packet.Seq + uint32(message.Size())
+		t.seqWithData[seq] = packet.Ack
+		message.DataSeq = seq
+		message.complete = false
+
+		// In case if sequence packet came first
+		for _, m := range t.messages {
+			if m.Seq == seq {
+				t.deleteMessage(m)
+				if m.AssocMessage != nil {
+					message.setAssocMessage(m.AssocMessage)
+				}
+				// log.Println("2: Adding ack alias:", m.Ack, packet.Ack)
+				t.ackAliases[m.Ack] = packet.Ack
+
+				for _, pkt := range m.packets {
+					pkt.UpdateAck(packet.Ack)
+					message.AddPacket(pkt)
+				}
+			}
+		}
+
+		// Removing `Expect: 100-continue` header
+		packet.Data = proto.DeleteHeader(packet.Data, bExpectHeader)
+	}
+
+	// log.Println("Received message:", string(message.Bytes()), message.ID(), t.messages)
+
+	if isIncoming {
+		// If message have multiple packets, delete previous alias
+		if len(message.packets) > 1 {
+			delete(t.respAliases, message.ResponseAck)
+		}
+
+		message.UpdateResponseAck()
+		t.respAliases[message.ResponseAck] = message
+	}
+
+	// If message contains only single packet immediately dispatch it
+	if message.complete {
+		// log.Println("COMPLETE!", isIncoming, message)
+		if isIncoming {
+			if t.trackResponse {
+				// log.Println("Found response!", message.ResponseID, t.messages)
+
+				if resp, ok := t.messages[message.ResponseID]; ok {
+					if resp.complete {
+						t.dispatchMessage(resp)
+					}
+
+					t.dispatchMessage(message)
+				}
+			} else {
+				t.dispatchMessage(message)
+			}
+		} else {
+			if message.AssocMessage == nil {
+				return
+			}
+
+			if req, ok := t.messages[message.AssocMessage.ID()]; ok {
+				if req.complete {
+					t.dispatchMessage(req)
+					t.dispatchMessage(message)
+				}
+			}
+		}
+	}
+}
+
+func (t *Listener) IsReady() bool {
+	select {
+	case <-t.readyCh:
+		return true
+	case <-time.After(5 * time.Second):
+		return false
+	}
+}
+
+// Receive TCP messages from the listener channel
+func (t *Listener) Receiver() chan *TCPMessage {
+	return t.messagesChan
+}
+
+func (t *Listener) Close() {
+	close(t.quit)
+	if t.conn != nil {
+		t.conn.Close()
+	}
+
+	for _, h := range t.pcapHandles {
+		h.Close()
+	}
+
+	return
+}

raw_socket_listener/listener_test.go

@@ -0,0 +1,477 @@
+package rawSocket
+
+import (
+	"bytes"
+	"log"
+	"math/rand"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestRawListenerInput(t *testing.T) {
+	var req, resp *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+
+	respAck := reqPacket.Seq + uint32(len(reqPacket.Data))
+	respPacket := buildPacket(false, respAck, reqPacket.Seq+1, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	listener.packetsChan <- reqPacket.dump()
+	listener.packetsChan <- respPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return request immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+	case <-time.After(20 * time.Millisecond):
+		t.Error("Should return response immediately")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+}
+
+func TestRawListenerInputResponseByClose(t *testing.T) {
+	var req, resp *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+
+	respAck := reqPacket.Seq + uint32(len(reqPacket.Data))
+	respPacket := buildPacket(false, respAck, reqPacket.Seq+1, []byte("HTTP/1.1 200 OK\r\nConnection: close\r\n\r\nasd"), time.Now())
+	finPacket := buildPacket(false, respAck, reqPacket.Seq+2, []byte(""), time.Now())
+	finPacket.IsFIN = true
+
+	listener.packetsChan <- reqPacket.dump()
+	listener.packetsChan <- respPacket.dump()
+	listener.packetsChan <- finPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return request immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+	case <-time.After(20 * time.Millisecond):
+		t.Error("Should return response immediately")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+}
+
+func TestRawListenerInputWithoutResponse(t *testing.T) {
+	var req *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, false, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+
+	listener.packetsChan <- reqPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return request immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+}
+
+func TestRawListenerResponse(t *testing.T) {
+	var req, resp *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+	respPacket := buildPacket(false, 1+uint32(len(reqPacket.Data)), 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	// If response packet comes before request
+	listener.packetsChan <- respPacket.dump()
+	listener.packetsChan <- reqPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return respose immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return response immediately")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+
+	if !bytes.Equal(resp.UUID(), req.UUID()) {
+		t.Error("Resp and Req UUID should be equal")
+	}
+}
+
+func TestShort100Continue(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\nExpect: 100-continue\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("a"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+1, []byte("b"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket3.Seq+1 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	result := []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab")
+
+	testRawListener100Continue(t, listener, result, reqPacket1, reqPacket2, reqPacket3, respPacket1, respPacket2)
+}
+
+// Response comes before Request
+func Test100ContinueWrongOrder(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\nExpect: 100-continue\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("a"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+1, []byte("b"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket3.Seq+1 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	result := []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab")
+
+	testRawListener100Continue(t, listener, result, respPacket1, respPacket2, reqPacket1, reqPacket2, reqPacket3)
+}
+
+func TestAlt100ContinueHeaderOrder(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nExpect: 100-continue\r\nContent-Length: 2\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("a"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+1, []byte("b"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket3.Seq+1 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	result := []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab")
+
+	testRawListener100Continue(t, listener, result, reqPacket1, reqPacket2, reqPacket3, respPacket1, respPacket2)
+}
+
+func testRawListener100Continue(t *testing.T, listener *Listener, result []byte, packets ...*TCPPacket) {
+	var req, resp *TCPMessage
+	for _, p := range packets {
+		listener.packetsChan <- p.dump()
+	}
+
+	select {
+	case req = <-listener.messagesChan:
+		break
+	case <-time.After(11 * time.Millisecond):
+		t.Error("Should return response after expire time")
+		return
+	}
+
+	if !bytes.Equal(req.Bytes(), result) {
+		t.Error("Should receive full message", string(req.Bytes()))
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+		break
+	case <-time.After(21 * time.Millisecond):
+		t.Error("Should return response after expire time")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+
+	if !bytes.Equal(resp.UUID(), req.UUID()) {
+		t.Error("Resp and Req UUID should be equal")
+	}
+}
+
+func testChunkedSequence(t *testing.T, listener *Listener, packets ...*TCPPacket) {
+	var r, req, resp *TCPMessage
+
+	for _, p := range packets {
+		listener.packetsChan <- p.dump()
+	}
+
+	select {
+	case r = <-listener.messagesChan:
+		if r.IsIncoming {
+			req = r
+		} else {
+			resp = r
+		}
+		break
+	case <-time.After(25 * time.Millisecond):
+		t.Error("Should return request after expire time")
+		return
+	}
+	select {
+	case r = <-listener.messagesChan:
+		if r.IsIncoming {
+			if req != nil {
+				t.Error("Request already received", r)
+				return
+			}
+			req = r
+		} else {
+			if resp != nil {
+				t.Error("Response already received", r)
+				return
+			}
+			resp = r
+		}
+		break
+	case <-time.After(25 * time.Millisecond):
+		t.Error("Should return request after expire time")
+		return
+	}
+
+	if !bytes.Equal(req.Bytes(), []byte("POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\n\r\n1\r\na\r\n1\r\nb\r\n0\r\n\r\n")) {
+		t.Error("Should receive full message", string(req.Bytes()))
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+
+	if !bytes.Equal(resp.UUID(), req.UUID()) {
+		t.Error("Resp and Req UUID should be equal", string(resp.UUID()), string(req.UUID()))
+	}
+
+	time.Sleep(20 * time.Millisecond)
+
+	if len(listener.packetsChan) != 0 {
+		t.Fatal("packetsChan non empty:", listener.packetsChan)
+	}
+
+	if len(listener.messagesChan) != 0 {
+		t.Fatal("messagesChan non empty:", <-listener.messagesChan)
+	}
+
+	if len(listener.messages) != 0 {
+		t.Fatal("Messages non empty:", listener.messages)
+	}
+
+	if len(listener.ackAliases) != 0 {
+		t.Fatal("ackAliases non empty:", listener.ackAliases)
+	}
+
+	if len(listener.seqWithData) != 0 {
+		t.Fatal("seqWithData non empty:", listener.seqWithData)
+	}
+
+	if len(listener.respAliases) != 0 {
+		t.Fatal("respAliases non empty:", listener.respAliases)
+	}
+
+	if len(listener.respWithoutReq) != 0 {
+		t.Fatal("respWithoutReq non empty:", listener.respWithoutReq)
+	}
+}
+
+func permutation(n int, list []*TCPPacket) []*TCPPacket {
+	if len(list) == 1 {
+		return list
+	}
+
+	k := n % len(list)
+
+	first := []*TCPPacket{list[k]}
+	next := make([]*TCPPacket, len(list)-1)
+
+	copy(next, append(list[:k], list[k+1:]...))
+
+	return append(first, permutation(n/len(list), next)...)
+}
+
+// Response comes before Request
+func TestRawListenerChunkedWrongOrder(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\nExpect: 100-continue\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("1\r\na\r\n"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+uint32(len(reqPacket2.Data)), []byte("1\r\nb\r\n"), time.Now())
+	reqPacket4 := buildPacket(true, 2, reqPacket3.Seq+uint32(len(reqPacket3.Data)), []byte("0\r\n\r\n"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket4.Seq+5 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	// Should re-construct message from all possible combinations
+	for i := 0; i < 6*5*4*3*2*1; i++ {
+
+		// if i < 54 || i > 57 {
+		// 	continue
+		// }
+
+		packets := permutation(i, []*TCPPacket{reqPacket1, reqPacket2, reqPacket3, reqPacket4, respPacket1, respPacket2})
+
+		t.Log("permutation:", i)
+		testChunkedSequence(t, listener, packets...)
+	}
+}
+
+func chunkedPostMessage() []*TCPPacket {
+	ack := uint32(rand.Int63())
+	seq := uint32(rand.Int63())
+
+	reqPacket1 := buildPacket(true, ack, seq, []byte("POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, ack, seq+47, []byte("1\r\na\r\n"), time.Now())
+	reqPacket3 := buildPacket(true, ack, reqPacket2.Seq+5, []byte("1\r\nb\r\n"), time.Now())
+	reqPacket4 := buildPacket(true, ack, reqPacket3.Seq+5, []byte("0\r\n\r\n"), time.Now())
+
+	respPacket := buildPacket(false, reqPacket4.Seq+5 /* len of data */, ack, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	return []*TCPPacket{
+		reqPacket1, reqPacket2, reqPacket3, reqPacket4, respPacket,
+	}
+}
+
+func postMessage() []*TCPPacket {
+	ack := uint32(rand.Int63())
+	seq2 := uint32(rand.Int63())
+	seq := uint32(rand.Int63())
+
+	c := 10000
+	data := make([]byte, c)
+	rand.Read(data)
+
+	head := []byte("POST / HTTP/1.1\r\nContent-Length: 9958\r\n\r\n")
+	for i := range head {
+		data[i] = head[i]
+	}
+
+	return []*TCPPacket{
+		buildPacket(true, ack, seq, data, time.Now()),
+		buildPacket(false, seq+uint32(len(data)), seq2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now()),
+	}
+}
+
+func getMessage() []*TCPPacket {
+	ack := uint32(rand.Int63())
+	seq2 := uint32(rand.Int63())
+	seq := uint32(rand.Int63())
+
+	return []*TCPPacket{
+		buildPacket(true, ack, seq, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now()),
+		buildPacket(false, seq+18, seq2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now()),
+	}
+}
+
+// Response comes before Request
+func TestRawListenerBench(t *testing.T) {
+	l := NewListener("", "0", EnginePcap, true, 200*time.Millisecond)
+	defer l.Close()
+
+	// Should re-construct message from all possible combinations
+	for i := 0; i < 1000; i++ {
+		go func(i int) {
+			for j := 0; j < 100; j++ {
+				var packets []*TCPPacket
+
+				if j%5 == 0 {
+					packets = chunkedPostMessage()
+				} else if j%3 == 0 {
+					packets = postMessage()
+				} else {
+					packets = getMessage()
+				}
+
+				for _, p := range packets {
+					// Randomly drop packets
+					if (i+j)%5 == 0 {
+						if rand.Int63()%3 == 0 {
+							continue
+						}
+					}
+
+					l.packetsChan <- p.dump()
+					time.Sleep(time.Millisecond)
+				}
+
+				time.Sleep(5 * time.Millisecond)
+			}
+		}(i)
+	}
+
+	ch := l.Receiver()
+
+	var count int32
+
+	for {
+		select {
+		case <-ch:
+			atomic.AddInt32(&count, 1)
+		case <-time.After(2000 * time.Millisecond):
+			log.Println("Emitted 200000 messages, captured: ", count, len(l.ackAliases), len(l.seqWithData), len(l.respAliases), len(l.respWithoutReq), len(l.packetsChan))
+			return
+		}
+	}
+}

raw_socket_listener/tcp_message.go

@@ -0,0 +1,511 @@
+package rawSocket
+
+import (
+	"bytes"
+	"crypto/sha1"
+	"encoding/binary"
+	"encoding/hex"
+	"github.com/buger/gor/proto"
+	"log"
+	"net"
+	"strconv"
+	"time"
+)
+
+var _ = log.Println
+
+// TCPMessage ensure that all TCP packets for given request is received, and processed in right sequence
+// Its needed because all TCP message can be fragmented or re-transmitted
+//
+// Each TCP Packet have 2 ids: acknowledgment - message_id, and sequence - packet_id
+// Message can be compiled from unique packets with same message_id which sorted by sequence
+// Message is received if we didn't receive any packets for 2000ms
+type TCPMessage struct {
+	Seq         uint32
+	Ack         uint32
+	ResponseAck uint32
+	ResponseID  tcpID
+	DataAck     uint32
+	DataSeq     uint32
+
+	AssocMessage *TCPMessage
+	Start        time.Time
+	End          time.Time
+	IsIncoming   bool
+
+	packets []*TCPPacket
+
+	delChan chan *TCPMessage
+
+	/* HTTP specific variables */
+	methodType    httpMethodType
+	bodyType      httpBodyType
+	expectType    httpExpectType
+	seqMissing    bool
+	headerPacket  int
+	contentLength int
+	complete      bool
+}
+
+// NewTCPMessage pointer created from a Acknowledgment number and a channel of messages readuy to be deleted
+func NewTCPMessage(Seq, Ack uint32, IsIncoming bool, timestamp time.Time) (msg *TCPMessage) {
+	msg = &TCPMessage{Seq: Seq, Ack: Ack, IsIncoming: IsIncoming, Start: timestamp}
+
+	return
+}
+
+func (t *TCPMessage) packetsData() (d [][]byte) {
+	d = make([][]byte, len(t.packets))
+	for i, p := range t.packets {
+		d[i] = p.Data
+	}
+
+	return
+}
+
+// Bytes return message content
+func (t *TCPMessage) Bytes() (output []byte) {
+	for _, p := range t.packets {
+		output = append(output, p.Data...)
+	}
+
+	return output
+}
+
+// Size returns total body size
+func (t *TCPMessage) BodySize() (size int) {
+	if len(t.packets) == 0 || t.headerPacket == -1 {
+		return 0
+	}
+
+	size += len(proto.Body(t.packets[t.headerPacket].Data))
+
+	for _, p := range t.packets[t.headerPacket+1:] {
+		size += len(p.Data)
+	}
+
+	return
+}
+
+// Size returns total size of message
+func (t *TCPMessage) Size() (size int) {
+	if len(t.packets) == 0 {
+		return 0
+	}
+
+	for _, p := range t.packets {
+		size += len(p.Data)
+	}
+
+	return
+}
+
+// AddPacket to the message and ensure packet uniqueness
+// TCP allows that packet can be re-send multiple times
+func (t *TCPMessage) AddPacket(packet *TCPPacket) {
+	packetFound := false
+
+	for _, pkt := range t.packets {
+		if packet.Seq == pkt.Seq {
+			packetFound = true
+			break
+		}
+	}
+
+	if !packetFound {
+		// Packets not always captured in same Seq order, and sometimes we need to prepend
+		if len(t.packets) == 0 || packet.Seq > t.packets[len(t.packets)-1].Seq {
+			t.packets = append(t.packets, packet)
+		} else if packet.Seq < t.packets[0].Seq {
+			t.packets = append([]*TCPPacket{packet}, t.packets...)
+			t.Seq = packet.Seq // Message Seq should indicated starting seq
+		} else { // insert somewhere in the middle...
+			for i, p := range t.packets {
+				if packet.Seq < p.Seq {
+					t.packets = append(t.packets[:i], append([]*TCPPacket{packet}, t.packets[i:]...)...)
+					break
+				}
+			}
+		}
+
+		if t.IsIncoming {
+			t.End = time.Now()
+		} else {
+			t.End = time.Now().Add(time.Millisecond)
+		}
+
+		if packet.OrigAck != 0 {
+			t.DataAck = packet.OrigAck
+		}
+
+		if packet.timestamp.Before(t.Start) {
+			t.Start = packet.timestamp
+		}
+	}
+
+	t.checkSeqIntegrity()
+	t.updateHeadersPacket()
+	t.updateMethodType()
+	t.updateBodyType()
+	t.checkIfComplete()
+	t.check100Continue()
+}
+
+// Check if there is missing packet
+func (t *TCPMessage) checkSeqIntegrity() {
+	if len(t.packets) == 1 {
+		t.seqMissing = false
+	}
+
+	offset := len(t.packets) - 1
+
+	if t.packets[offset].IsFIN {
+		offset--
+
+		if offset < 0 {
+			return
+		}
+	}
+
+	for i, p := range t.packets[:offset] {
+		if p.IsFIN {
+			continue
+		}
+
+		// If final packet
+		if len(t.packets) == i+1 {
+			t.seqMissing = false
+			return
+		}
+		np := t.packets[i+1]
+
+		nextSeq := p.Seq + uint32(len(p.Data))
+
+		if np.Seq != nextSeq {
+			if t.expectType == httpExpect100Continue {
+				if np.Seq != nextSeq+22 {
+					t.seqMissing = true
+					return
+				}
+			} else {
+				t.seqMissing = true
+				return
+			}
+		}
+	}
+
+	t.seqMissing = false
+}
+
+var bEmptyLine = []byte("\r\n\r\n")
+var bChunkEnd = []byte("0\r\n\r\n")
+
+func (t *TCPMessage) updateHeadersPacket() {
+	if len(t.packets) == 1 {
+		t.headerPacket = -1
+	}
+
+	if t.headerPacket != -1 {
+		return
+	}
+
+	if t.seqMissing {
+		return
+	}
+
+	for i, p := range t.packets {
+		if bytes.LastIndex(p.Data, bEmptyLine) != -1 {
+			t.headerPacket = i
+			return
+		}
+	}
+
+	return
+}
+
+// isMultipart returns true if message contains from multiple tcp packets
+func (t *TCPMessage) checkIfComplete() {
+	if t.seqMissing || t.headerPacket == -1 {
+		return
+	}
+
+	if t.methodType == httpMethodNotFound {
+		return
+	}
+
+	// Responses can be emitted only if we found request
+	if !t.IsIncoming && t.AssocMessage == nil {
+		return
+	}
+
+	// If one GET, OPTIONS, or HEAD request
+	if t.methodType == httpMethodWithoutBody {
+		t.complete = true
+	} else {
+		switch t.bodyType {
+		case httpBodyEmpty:
+			t.complete = true
+		case httpBodyContentLength:
+			if t.contentLength == 0 || t.contentLength == t.BodySize() {
+				t.complete = true
+			}
+		case httpBodyChunked:
+			lastPacket := t.packets[len(t.packets)-1]
+			if bytes.LastIndex(lastPacket.Data, bChunkEnd) != -1 {
+				t.complete = true
+			}
+		default:
+			if len(t.packets) == 0 {
+				return
+			}
+
+			last := t.packets[len(t.packets)-1]
+			if last.IsFIN {
+				t.complete = true
+			}
+		}
+	}
+}
+
+type httpMethodType uint8
+
+const (
+	httpMethodNotSet      httpMethodType = 0
+	httpMethodWithBody    httpMethodType = 1
+	httpMethodWithoutBody httpMethodType = 2
+	httpMethodNotFound    httpMethodType = 3
+)
+
+var methodsWithBody = [][]byte{
+	[]byte("POST"),
+	[]byte("PUT"),
+	[]byte("PATCH"),
+	[]byte("CONNECT"),
+}
+
+func (t *TCPMessage) updateMethodType() {
+	// if there is cache
+	if t.methodType != httpMethodNotSet && t.methodType != httpMethodNotFound {
+		return
+	}
+
+	d := t.packets[0].Data
+
+	// Minimum length fo request: GET / HTTP/1.1\r\n
+
+	if len(d) < 16 {
+		t.methodType = httpMethodNotFound
+		return
+	}
+
+	if t.IsIncoming {
+		var method []byte
+
+		if mIdx := bytes.IndexByte(d[:8], ' '); mIdx != -1 {
+			method = d[:mIdx]
+
+			// Check that after method we have absolute or relative path
+			switch d[mIdx+1] {
+			case '/', 'h', '*':
+			default:
+				t.methodType = httpMethodNotFound
+				return
+			}
+		} else {
+			t.methodType = httpMethodNotFound
+			return
+		}
+
+		for _, m := range methodsWithBody {
+			if len(m) == len(method) && bytes.Equal(m, method) {
+				t.methodType = httpMethodWithBody
+				return
+			}
+		}
+
+		t.methodType = httpMethodWithoutBody
+	} else {
+		if !bytes.Equal(d[:6], []byte("HTTP/1")) {
+			t.methodType = httpMethodNotFound
+			return
+		}
+
+		t.methodType = httpMethodWithBody
+	}
+}
+
+type httpBodyType uint8
+
+const (
+	httpBodyNotSet          httpBodyType = 0
+	httpBodyEmpty           httpBodyType = 1
+	httpBodyContentLength   httpBodyType = 2
+	httpBodyChunked         httpBodyType = 3
+	httpBodyConnectionClose httpBodyType = 4
+)
+
+func (t *TCPMessage) updateBodyType() {
+	// if there is cache
+	if t.bodyType != httpBodyNotSet {
+		return
+	}
+
+	// Headers not received
+	if t.headerPacket == -1 {
+		return
+	}
+
+	var lengthB, encB, connB []byte
+
+	proto.ParseHeaders(t.packetsData(), func(header, value []byte)bool{
+		if proto.HeadersEqual(header, []byte("Content-Length")) {
+			lengthB = value
+			return false
+		}
+
+		if proto.HeadersEqual(header, []byte("Transfer-Encoding")) {
+			encB = value
+			return false
+		}
+
+		if proto.HeadersEqual(header, []byte("Connection")) {
+			connB = value
+		}
+
+		return true
+	})
+
+	switch t.methodType {
+	case httpMethodNotFound:
+		return
+	case httpMethodWithoutBody:
+		t.bodyType = httpBodyEmpty
+		return
+	case httpMethodWithBody:
+		if len(lengthB) > 0 {
+			t.contentLength, _ = strconv.Atoi(string(lengthB))
+
+			if t.contentLength == 0 {
+				t.bodyType = httpBodyEmpty
+			} else {
+				t.bodyType = httpBodyContentLength
+			}
+			return
+		}
+
+		if len(encB) > 0 {
+			t.bodyType = httpBodyChunked
+			return
+		}
+
+		if len(connB) > 0 && bytes.Equal(connB, []byte("close")) {
+			t.bodyType = httpBodyConnectionClose
+			return
+		}
+	}
+
+	t.bodyType = httpBodyEmpty
+}
+
+type httpExpectType uint8
+
+const (
+	httpExpectNotSet      httpExpectType = 0
+	httpExpectEmpty       httpExpectType = 1
+	httpExpect100Continue httpExpectType = 2
+)
+
+var bExpectHeader = []byte("Expect")
+var bExpect100Value = []byte("100-continue")
+
+func (t *TCPMessage) check100Continue() {
+	if t.expectType != httpExpectNotSet || len(t.packets[0].Data) < 25 {
+		return
+	}
+
+	if t.methodType != httpMethodWithBody {
+		return
+	}
+
+	if t.seqMissing || t.headerPacket == -1 {
+		return
+	}
+
+	last := t.packets[len(t.packets)-1]
+	// reading last 4 bytes for double CRLF
+	if !bytes.HasSuffix(last.Data, bEmptyLine) {
+		return
+	}
+
+	var expectB []byte
+	proto.ParseHeaders(t.packetsData(), func(header, value []byte)bool{
+		if proto.HeadersEqual(header, bExpectHeader) {
+			expectB = value
+			return false
+		}
+
+		return true
+	})
+
+	if len(expectB) > 0 && bytes.Equal(bExpect100Value, expectB) {
+		t.expectType = httpExpect100Continue
+		return
+	}
+
+	t.expectType = httpExpectEmpty
+}
+
+func (t *TCPMessage) setAssocMessage(m *TCPMessage) {
+	t.AssocMessage = m
+	t.checkIfComplete()
+}
+
+// UpdateResponseAck should be called after packet is added
+func (t *TCPMessage) UpdateResponseAck() uint32 {
+	lastPacket := t.packets[len(t.packets)-1]
+	if lastPacket.IsFIN && len(t.packets) > 1 {
+		lastPacket = t.packets[len(t.packets)-2]
+	}
+
+	respAck := lastPacket.Seq + uint32(len(lastPacket.Data))
+
+	if t.ResponseAck != respAck {
+		t.ResponseAck = lastPacket.Seq + uint32(len(lastPacket.Data))
+
+		// We swappwed src and dst port
+		copy(t.ResponseID[:16], lastPacket.Addr)
+		copy(t.ResponseID[16:], lastPacket.Raw[2:4]) // Src port
+		copy(t.ResponseID[18:], lastPacket.Raw[0:2]) // Dest port
+		binary.BigEndian.PutUint32(t.ResponseID[20:24], t.ResponseAck)
+	}
+
+	return t.ResponseAck
+}
+
+func (t *TCPMessage) UUID() []byte {
+	var key []byte
+
+	if t.IsIncoming {
+		// log.Println("UUID:", t.Ack, t.Start.UnixNano())
+		key = strconv.AppendInt(key, t.Start.UnixNano(), 10)
+		key = strconv.AppendUint(key, uint64(t.Ack), 10)
+	} else {
+		// log.Println("RequestMessage:", t.AssocMessage.Ack, t.AssocMessage.Start.UnixNano())
+		key = strconv.AppendInt(key, t.AssocMessage.Start.UnixNano(), 10)
+		key = strconv.AppendUint(key, uint64(t.AssocMessage.Ack), 10)
+	}
+
+	uuid := make([]byte, 40)
+	sha := sha1.Sum(key)
+	hex.Encode(uuid, sha[:20])
+
+	return uuid
+}
+
+func (t *TCPMessage) ID() tcpID {
+	return t.packets[0].ID
+}
+
+func (t *TCPMessage) IP() net.IP {
+	return net.IP(t.packets[0].Addr)
+}

raw_socket_listener/tcp_message_test.go

@@ -0,0 +1,258 @@
+package rawSocket
+
+import (
+	"bytes"
+	"encoding/binary"
+	_ "log"
+	"testing"
+	"time"
+)
+
+func buildPacket(isIncoming bool, Ack, Seq uint32, Data []byte, timestamp time.Time) (packet *TCPPacket) {
+	var srcPort, destPort uint16
+
+	// For tests `listening` port is 0
+	if isIncoming {
+		srcPort = 1
+	} else {
+		destPort = 1
+	}
+
+	buf := make([]byte, 16)
+	binary.BigEndian.PutUint16(buf[2:4], destPort)
+	binary.BigEndian.PutUint16(buf[0:2], srcPort)
+	binary.BigEndian.PutUint32(buf[4:8], Seq)
+	binary.BigEndian.PutUint32(buf[8:12], Ack)
+	buf[12] = 64
+	buf = append(buf, Data...)
+
+	packet = ParseTCPPacket([]byte("123"), buf, timestamp)
+
+	return packet
+}
+
+func buildMessage(p *TCPPacket) *TCPMessage {
+	isIncoming := false
+	if p.SrcPort == 1 {
+		isIncoming = true
+	}
+
+	m := NewTCPMessage(p.Seq, p.Ack, isIncoming, p.timestamp)
+	m.AddPacket(p)
+
+	return m
+}
+
+func TestTCPMessagePacketsOrder(t *testing.T) {
+	msg := buildMessage(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+
+	if !bytes.Equal(msg.Bytes(), []byte("ab")) {
+		t.Error("Should contatenate packets in right order")
+	}
+
+	// When first packet have wrong order (Seq)
+	msg = buildMessage(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+
+	if !bytes.Equal(msg.Bytes(), []byte("ab")) {
+		t.Error("Should contatenate packets in right order")
+	}
+
+	// Should ignore packets with same sequence
+	msg = buildMessage(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+
+	if !bytes.Equal(msg.Bytes(), []byte("a")) {
+		t.Error("Should ignore packet with same Seq")
+	}
+}
+
+func TestTCPMessageSize(t *testing.T) {
+	msg := buildMessage(buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\na"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+
+	if msg.BodySize() != 2 {
+		t.Error("Should count only body", msg.BodySize())
+	}
+
+	if msg.Size() != 40 {
+		t.Error("Should count all sizes", msg.Size())
+	}
+}
+
+func TestTCPMessageIsComplete(t *testing.T) {
+	testCases := []struct {
+		direction         bool
+		payload           string
+		assocMessage      bool
+		expectedCompleted bool
+	}{
+		{true, "GET / HTTP/1.1\r\n\r\n", false, true},
+		{true, "HEAD / HTTP/1.1\r\n\r\n", false, true},
+		{false, "HTTP/1.1 200 OK\r\n\r\n", true, true},
+		{true, "POST / HTTP/1.1\r\nContent-Length: 1\r\n\r\na", false, true},
+		{true, "PUT / HTTP/1.1\r\nContent-Length: 1\r\n\r\na", false, true},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n", true, true},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 1\r\n\r\na", true, true},
+		{false, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n0\r\n\r\n", true, true},
+
+		// chunked not finished
+		{false, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n", true, false},
+
+		// content-length != actual length
+		{true, "POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\na", false, false},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\na", true, false},
+		// non-valid http request
+		{true, "UNKNOWN asd HTTP/1.1\r\n\r\n", false, false},
+
+		// response without associated request
+		{false, "HTTP/1.1 200 OK\r\n\r\n", false, false},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payload), time.Now()))
+		if tc.assocMessage {
+			msg.AssocMessage = &TCPMessage{}
+		}
+		msg.checkIfComplete()
+
+		if msg.complete != tc.expectedCompleted {
+			t.Errorf("Payload %s: Expected %t, got %t.", tc.payload, tc.expectedCompleted, msg.complete)
+		}
+	}
+}
+
+func TestTCPMessageIsSeqMissing(t *testing.T) {
+	p1 := buildPacket(false, 1, 1, []byte("HTTP/1.1 200 OK\r\n"), time.Now())
+	p2 := buildPacket(false, 1, p1.Seq+uint32(len(p1.Data)), []byte("Content-Length: 10\r\n\r\n"), time.Now())
+	p3 := buildPacket(false, 1, p2.Seq+uint32(len(p2.Data)), []byte("a"), time.Now())
+
+	msg := buildMessage(p1)
+	if msg.seqMissing {
+		t.Error("Should be complete if have only 1 packet")
+	}
+
+	msg.AddPacket(p3)
+	if !msg.seqMissing {
+		t.Error("Should be incomplete because missing middle component")
+	}
+
+	msg.AddPacket(p2)
+	if msg.seqMissing {
+		t.Error("Should be complete once missing packet added")
+	}
+}
+
+func TestTCPMessageIsHeadersReceived(t *testing.T) {
+	p1 := buildPacket(false, 1, 1, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+	p2 := buildPacket(false, 1, p1.Seq+uint32(len(p1.Data)), []byte("Content-Length: 10\r\n\r\n"), time.Now())
+
+	msg := buildMessage(p1)
+	if msg.headerPacket == -1 {
+		t.Error("Should be complete if have only 1 packet", msg.headerPacket)
+	}
+
+	msg.AddPacket(p2)
+	if msg.headerPacket == -1 {
+		t.Error("Should found double new line: headers received")
+	}
+
+	msg = buildMessage(buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\nContent-Length: 1\r\n"), time.Now()))
+	if msg.headerPacket != -1 {
+		t.Error("Should not find headers end")
+	}
+}
+
+func TestTCPMessageMethodType(t *testing.T) {
+	testCases := []struct {
+		direction          bool
+		payload            string
+		expectedMethodType httpMethodType
+	}{
+		{true, "GET / HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "GET * HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "UNKNOWN / HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "GET http://example.com HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "POST / HTTP/1.1\r\n\r\n", httpMethodWithBody},
+		{true, "PUT / HTTP/1.1\r\n\r\n", httpMethodWithBody},
+		{true, "GET zxc HTTP/1.1\r\n\r\n", httpMethodNotFound},
+		{true, "GET / HTTP\r\n\r\n", httpMethodNotFound},
+		{true, "VERYLONGMETHOD / HTTP/1.1\r\n\r\n", httpMethodNotFound},
+		{false, "HTTP/1.1 200 OK\r\n\r\n", httpMethodWithBody},
+		{false, "HTTP /1.1 200 OK\r\n\r\n", httpMethodNotFound},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payload), time.Now()))
+
+		if msg.methodType != tc.expectedMethodType {
+			t.Errorf("Expected %d, got %d", tc.expectedMethodType, msg.methodType)
+		}
+	}
+}
+
+func TestTCPMessageBodyType(t *testing.T) {
+	testCases := []struct {
+		direction        bool
+		payload          string
+		expectedBodyType httpBodyType
+	}{
+		{true, "GET / HTTP/1.1\r\n\r\n", httpBodyEmpty},
+		{true, "POST / HTTP/1.1\r\n\r\n", httpBodyEmpty},
+		{true, "POST / HTTP/1.1\r\nUser-Agent: zxc\r\n\r\n", httpBodyEmpty},
+		{false, "HTTP/1.1 200 OK\r\n\r\n", httpBodyEmpty},
+		{true, "POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab", httpBodyContentLength},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nab", httpBodyContentLength},
+		{true, "POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\n\r\n2\r\nab\r\n0\r\n\r\n", httpBodyChunked},
+		{false, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n2\r\nab\r\n0\r\n\r\n", httpBodyChunked},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payload), time.Now()))
+
+		if msg.bodyType != tc.expectedBodyType {
+			t.Errorf("Expected %d, got %d", tc.expectedBodyType, msg.bodyType)
+		}
+	}
+}
+
+func TestTCPMessageBodySize(t *testing.T) {
+	testCases := []struct {
+		direction    bool
+		payloads     []string
+		expectedSize int
+	}{
+		{true, []string{"GET / HTTP/1.1\r\n\r\n"}, 0},
+		{true, []string{"POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab"}, 2},
+		{true, []string{"GET / HTTP/1.1\r\n", "Content-Length: 2\r\n\r\nab"}, 2},
+		{true, []string{"GET / HTTP/1.1\r\n", "Content-Length: 2\r\n\r\n", "ab"}, 2},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payloads[0]), time.Now()))
+
+		if len(tc.payloads) > 1 {
+			for _, p := range tc.payloads[1:] {
+				seq := uint32(1 + msg.Size())
+				msg.AddPacket(buildPacket(tc.direction, 1, seq, []byte(p), time.Now()))
+			}
+		}
+
+		if msg.BodySize() != tc.expectedSize {
+			t.Errorf("Expected %d, got %d", tc.expectedSize, msg.BodySize())
+		}
+	}
+}
+
+func TestTcpMessageStart(t *testing.T) {
+	start := time.Now().Add(-1 * time.Second)
+
+	msg := buildMessage(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\na"), start))
+
+	if msg.Start != start {
+		t.Error("Message timestamp should be equal to the lowest related packet timestamp", start, msg.Start)
+	}
+}
+

raw_socket_listener/tcp_packet.go

@@ -0,0 +1,133 @@
+package rawSocket
+
+import (
+	"encoding/binary"
+	"log"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var _ = log.Println
+
+// TCP Flags
+const (
+	fFIN = 1 << iota
+	fSYN
+	fRST
+	fPSH
+	fACK
+	fURG
+	fECE
+	fCWR
+	fNS
+)
+
+type tcpID [24]byte
+
+// TCPPacket provides tcp packet parser
+// Packet structure: http://en.wikipedia.org/wiki/Transmission_Control_Protocol
+type TCPPacket struct {
+	SrcPort    uint16
+	DestPort   uint16
+	Seq        uint32
+	Ack        uint32
+	OrigAck    uint32
+	DataOffset uint8
+	IsFIN      bool
+
+	Raw  []byte
+	Data []byte
+	Addr []byte
+	timestamp time.Time
+	ID   tcpID
+}
+
+// ParseTCPPacket takes address and tcp payload and returns parsed TCPPacket
+func ParseTCPPacket(addr []byte, data []byte, timestamp time.Time) (p *TCPPacket) {
+	p = &TCPPacket{Raw: data}
+	p.ParseBasic()
+	p.Addr = addr
+	p.timestamp = timestamp
+	p.GenID()
+
+	return
+}
+
+func (p *TCPPacket) GenID() {
+	copy(p.ID[:16], p.Addr)
+	copy(p.ID[16:], p.Raw[0:2])  // Src port
+	copy(p.ID[18:], p.Raw[2:4])  // Dest port
+	copy(p.ID[20:], p.Raw[8:12]) // Ack
+}
+
+func (p *TCPPacket) UpdateAck(ack uint32) {
+	p.OrigAck = p.Ack
+	p.Ack = ack
+	binary.BigEndian.PutUint32(p.Raw[8:12], ack)
+	p.GenID()
+}
+
+// ParseBasic set of fields
+func (t *TCPPacket) ParseBasic() {
+	t.DestPort = binary.BigEndian.Uint16(t.Raw[2:4])
+	t.SrcPort = binary.BigEndian.Uint16(t.Raw[0:2])
+	t.Seq = binary.BigEndian.Uint32(t.Raw[4:8])
+	t.Ack = binary.BigEndian.Uint32(t.Raw[8:12])
+	t.DataOffset = (t.Raw[12] & 0xF0) >> 4
+	t.IsFIN = t.Raw[13]&0x01 != 0
+
+	// log.Println("DataOffset:", t.DataOffset, t.DestPort, t.SrcPort, t.Seq, t.Ack)
+
+	t.Data = t.Raw[t.DataOffset*4:]
+}
+
+func (t *TCPPacket) dump() *packet {
+
+	packetSrcIP := make([]byte, 16)
+	packetData := make([]byte, len(t.Data) + 16)
+
+	copy(packetSrcIP, t.Addr)
+
+	binary.BigEndian.PutUint16(packetData[0:2], t.SrcPort)
+	binary.BigEndian.PutUint16(packetData[2:4], t.DestPort)
+
+	binary.BigEndian.PutUint32(packetData[4:8], t.Seq)
+	binary.BigEndian.PutUint32(packetData[8:12], t.Ack)
+
+	packetData[12] = 64
+
+	if t.IsFIN {
+		packetData[13] = packetData[13] | 0x01
+	}
+
+	copy(packetData[16:], t.Data)
+
+	return &packet{
+		srcIP: packetSrcIP,
+		data:packetData,
+		timestamp:t.timestamp,
+	}
+
+}
+
+// String output for a TCP Packet
+func (t *TCPPacket) String() string {
+	maxLen := len(t.Data)
+	if maxLen > 200 {
+		maxLen = 200
+	}
+
+	return strings.Join([]string{
+		"Addr: " + string(t.Addr),
+		"Source port: " + strconv.Itoa(int(t.SrcPort)),
+		"Dest port:" + strconv.Itoa(int(t.DestPort)),
+		"Sequence:" + strconv.Itoa(int(t.Seq)),
+		"Acknowledgment:" + strconv.Itoa(int(t.Ack)),
+		"Header len:" + strconv.Itoa(int(t.DataOffset)),
+		"FIN:" + strconv.FormatBool(t.IsFIN),
+
+		"Data size:" + strconv.Itoa(len(t.Data)),
+		"Data:" + string(t.Data[:maxLen]),
+	}, "\n")
+}

replay/replay.go

@@ -1,121 +0,0 @@
-// Replay server receive requests objects from Listeners and forward it to given address.
-// Basic usage:
-//
-//     gor replay -f http://staging.server
-//
-//
-// Rate limiting
-//
-// It can be useful if you want forward only part of production traffic, not to overload staging environment. You can specify desired request per second using "|" operator after server address:
-//
-//     # staging.server not get more than 10 requests per second
-//     gor replay -f "http://staging.server|10"
-//
-//
-// Forward to multiple addresses
-//
-// Just separate addresses by coma:
-//    gor replay -f "http://staging.server|10,http://dev.server|20"
-//
-//
-//  For more help run:
-//
-//     gor replay -h
-//
-package replay
-
-import (
-	"bufio"
-	"bytes"
-	"io"
-	"log"
-	"net"
-	"net/http"
-)
-
-const bufSize = 4096
-
-// Enable debug logging only if "--verbose" flag passed
-func Debug(v ...interface{}) {
-	if Settings.Verbose {
-		log.Println(v...)
-	}
-}
-
-func ParseRequest(data []byte) (request *http.Request, err error) {
-	buf := bytes.NewBuffer(data)
-	reader := bufio.NewReader(buf)
-
-	request, err = http.ReadRequest(reader)
-	return
-}
-
-// Because its sub-program, Run acts as `main`
-// Replay server listen to UDP traffic from Listeners
-// Each request processed by RequestFactory
-func Run() {
-	listener, err := net.Listen("tcp", Settings.Address())
-
-	log.Println("Starting replay server at:", Settings.Address())
-
-	if err != nil {
-		log.Fatal("Can't start:", err)
-	}
-
-	for _, host := range Settings.ForwardedHosts() {
-		log.Println("Forwarding requests to:", host.Url, "limit:", host.Limit)
-	}
-
-	requestFactory := NewRequestFactory()
-
-	for {
-		conn, err := listener.Accept()
-
-		if err != nil {
-			log.Println("Error while Accept()", err)
-			continue
-		}
-
-		go handleConnection(conn, requestFactory)
-	}
-
-}
-
-func handleConnection(conn net.Conn, rf *RequestFactory) error {
-	defer conn.Close()
-
-	var read = true
-	var response []byte
-	var buf []byte
-
-	buf = make([]byte, bufSize)
-
-	for read {
-		log.Println("Start reading")
-		n, err := conn.Read(buf)
-		log.Println("Reading", n, err)
-
-		switch err {
-		case io.EOF:
-			read = false
-		case nil:
-			response = append(response, buf[0:n]...)
-			if n < bufSize {
-				read = false
-			}
-		default:
-			read = false
-		}
-	}
-
-	log.Println("Response", string(response))
-
-	if request, err := ParseRequest(response); err != nil {
-		Debug("Error while parsing request", err, response)
-	} else {
-		Debug("Adding request", request)
-		rf.Add(request)
-	}
-
-	return nil
-}

replay/request_factory.go

@@ -1,91 +0,0 @@
-package replay
-
-import (
-	"net/http"
-	"net/url"
-)
-
-type HttpResponse struct {
-	host *ForwardHost
-	req  *http.Request
-	resp *http.Response
-	err  error
-}
-
-// Class for processing requests
-//
-// Basic workflow:
-//
-// 1. When request added via Add() it get pushed to `responses` chan
-// 2. handleRequest() listen for `responses` chan and decide where request should be forwarded, and apply rate-limit if needed
-// 3. sendRequest() forwards request and returns response info to `responses` chan
-// 4. handleRequest() listen for `response` channel and updates stats
-type RequestFactory struct {
-	responses chan *HttpResponse
-	requests  chan *http.Request
-}
-
-// RequestFactory contstuctor
-// One created, it starts listening for incoming requests: requests channel
-func NewRequestFactory() (factory *RequestFactory) {
-	factory = &RequestFactory{}
-	factory.responses = make(chan *HttpResponse)
-	factory.requests = make(chan *http.Request)
-
-	go factory.handleRequests()
-
-	return
-}
-
-// Forward http request to given host
-func (f *RequestFactory) sendRequest(host *ForwardHost, request *http.Request) {
-	client := &http.Client{}
-
-	// Change HOST of original request
-	URL := host.Url + request.URL.Path + "?" + request.URL.RawQuery
-
-	request.RequestURI = ""
-	request.URL, _ = url.ParseRequestURI(URL)
-
-	Debug("Sending request:", host.Url, request)
-
-	resp, err := client.Do(request)
-
-	if err == nil {
-		defer resp.Body.Close()
-	} else {
-		Debug("Request error:", err)
-	}
-
-	f.responses <- &HttpResponse{host, request, resp, err}
-}
-
-// Handle incoming requests, and they responses
-func (f *RequestFactory) handleRequests() {
-	hosts := Settings.ForwardedHosts()
-
-	for {
-		select {
-		case req := <-f.requests:
-			for _, host := range hosts {
-				// Ensure that we have actual stats for given timestamp
-				host.Stat.Touch()
-
-				if host.Limit == 0 || host.Stat.Count < host.Limit {
-					// Increment Stat.Count
-					host.Stat.IncReq()
-
-					go f.sendRequest(host, req)
-				}
-			}
-		case resp := <-f.responses:
-			// Increment returned http code stats, and elapsed time
-			resp.host.Stat.IncResp(resp)
-		}
-	}
-}
-
-// Add request to channel for further processing
-func (f *RequestFactory) Add(request *http.Request) {
-	f.requests <- request
-}

replay/request_stats.go

@@ -1,63 +0,0 @@
-package replay
-
-import (
-	"time"
-)
-
-// Stats stores in context of current timestamp
-type RequestStat struct {
-	timestamp int64
-
-	Codes map[int]int // { 200: 10, 404:2, 500:1 }
-
-	Count  int // All requests including errors
-	Errors int // Rquests with errors (timeout or host not reachable). Not include 50x errors.
-
-	host *ForwardHost
-}
-
-// Ensure that current stats is actual (for current timestamp)
-func (s *RequestStat) Touch() {
-	if s.timestamp != time.Now().Unix() {
-		s.reset()
-	}
-}
-
-// Called on request start
-func (s *RequestStat) IncReq() {
-	s.Count++
-}
-
-// Called after response
-func (s *RequestStat) IncResp(resp *HttpResponse) {
-	s.Touch()
-
-	if resp.err != nil {
-		s.Errors++
-		return
-	}
-
-	s.Codes[resp.resp.StatusCode]++
-}
-
-// Updated stats timestamp to current time and reset to zero all stats values
-// TODO: Further on reset it should write stats to file
-func (s *RequestStat) reset() {
-	if s.timestamp != 0 {        
-	   Debug("Host:", s.host.Url, "Requests:", s.Count, "Errors:", s.Errors, "Status codes:", s.Codes)
-	}
-
-	s.timestamp = time.Now().Unix()
-
-	s.Codes = make(map[int]int)
-	s.Count = 0
-	s.Errors = 0
-}
-
-// RequestStat constructor
-func NewRequestStats(host *ForwardHost) (stat *RequestStat) {
-	stat = &RequestStat{host: host}
-	stat.reset()
-
-	return
-}

replay/settings.go

@@ -1,79 +0,0 @@
-package replay
-
-import (
-	"flag"
-	"os"
-	"strconv"
-	"strings"
-)
-
-type ForwardHost struct {
-	Url   string
-	Limit int
-
-	Stat *RequestStat
-}
-
-type ReplaySettings struct {
-	Port int
-	Host string
-
-	ForwardAddress string
-
-	Verbose bool
-}
-
-// ForwardedHosts implements forwardAddress syntax support for multiple hosts (coma separated), and rate limiting by specifing "|maxRps" after host name.
-//
-//    -f "host1,http://host2|10,host3"
-//
-func (r *ReplaySettings) ForwardedHosts() (hosts []*ForwardHost) {
-	hosts = make([]*ForwardHost, 0, 10)
-
-	for _, address := range strings.Split(r.ForwardAddress, ",") {
-		host_info := strings.Split(address, "|")
-
-		if strings.Index(host_info[0], "http") == -1 {
-			host_info[0] = "http://" + host_info[0]
-		}
-
-		host := &ForwardHost{Url: host_info[0]}
-		host.Stat = NewRequestStats(host)
-
-		if len(host_info) > 1 {
-			host.Limit, _ = strconv.Atoi(host_info[1])
-		}
-
-		hosts = append(hosts, host)
-	}
-
-	return
-}
-
-// Helper to return address with port, e.g.: 127.0.0.1:28020
-func (r *ReplaySettings) Address() string {
-	return r.Host + ":" + strconv.Itoa(r.Port)
-}
-
-var Settings ReplaySettings = ReplaySettings{}
-
-func init() {
-	if len(os.Args) < 2 || os.Args[1] != "replay" {
-		return
-	}
-
-	const (
-		defaultPort = 28020
-		defaultHost = "0.0.0.0"
-
-		defaultAddress = "http://localhost:8080"
-	)
-
-	flag.IntVar(&Settings.Port, "p", defaultPort, "specify port number")
-
-	flag.StringVar(&Settings.Host, "ip", defaultHost, "ip addresses to listen on")
-
-	flag.StringVar(&Settings.ForwardAddress, "f", defaultAddress, "http address to forward traffic.\n\tYou can limit requests per second by adding `|num` after address.\n\tIf you have multiple addresses with different limits. For example: http://staging.example.com|100,http://dev.example.com|10")
-
-	flag.BoolVar(&Settings.Verbose, "verbose", false, "Log requests")
-}

settings.go

@@ -0,0 +1,176 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"sync"
+	"time"
+)
+
+var VERSION string
+
+// MultiOption allows to specify multiple flags with same name and collects all values into array
+type MultiOption []string
+
+func (h *MultiOption) String() string {
+	return fmt.Sprint(*h)
+}
+
+// Set gets called multiple times for each flag with same name
+func (h *MultiOption) Set(value string) error {
+	*h = append(*h, value)
+	return nil
+}
+
+// AppSettings is the struct of main configuration
+type AppSettings struct {
+	verbose   bool
+	debug     bool
+	stats     bool
+	exitAfter time.Duration
+
+	splitOutput bool
+
+	inputDummy   MultiOption
+	outputDummy  MultiOption
+	outputStdout bool
+	outputNull   bool
+
+	inputTCP       MultiOption
+	outputTCP      MultiOption
+	outputTCPStats bool
+
+	inputFile        MultiOption
+	inputFileLoop    bool
+	outputFile       MultiOption
+	outputFileConfig FileOutputConfig
+
+	inputRAW              MultiOption
+	inputRAWEngine        string
+	inputRAWTrackResponse bool
+	inputRAWRealIPHeader  string
+
+	middleware string
+
+	inputHTTP  MultiOption
+	outputHTTP MultiOption
+
+	outputHTTPConfig HTTPOutputConfig
+	modifierConfig   HTTPModifierConfig
+
+	outputKafkaConfig KafkaConfig
+}
+
+// Settings holds Gor configuration
+var Settings AppSettings
+
+func usage() {
+	fmt.Printf("Gor is a simple http traffic replication tool written in Go. Its main goal is to replay traffic from production servers to staging and dev environments.\nProject page: https://github.com/buger/gor\nAuthor: <Leonid Bugaev> leonsbox@gmail.com\nCurrent Version: %s\n\n", VERSION)
+	flag.PrintDefaults()
+	os.Exit(2)
+}
+
+func init() {
+	flag.Usage = usage
+
+	flag.BoolVar(&Settings.verbose, "verbose", false, "Turn on more verbose output")
+	flag.BoolVar(&Settings.debug, "debug", false, "Turn on debug output, shows all intercepted traffic. Works only when with `verbose` flag")
+	flag.BoolVar(&Settings.stats, "stats", false, "Turn on queue stats output")
+	flag.DurationVar(&Settings.exitAfter, "exit-after", 0, "exit after specified duration")
+
+	flag.BoolVar(&Settings.splitOutput, "split-output", false, "By default each output gets same traffic. If set to `true` it splits traffic equally among all outputs.")
+
+	flag.Var(&Settings.inputDummy, "input-dummy", "Used for testing outputs. Emits 'Get /' request every 1s")
+	flag.Var(&Settings.outputDummy, "output-dummy", "DEPRECATED: use --output-stdout instead")
+
+	flag.BoolVar(&Settings.outputStdout, "output-stdout", false, "Used for testing inputs. Just prints to console data coming from inputs.")
+
+	flag.BoolVar(&Settings.outputNull, "output-null", false, "Used for testing inputs. Drops all requests.")
+
+	flag.Var(&Settings.inputTCP, "input-tcp", "Used for internal communication between Gor instances. Example: \n\t# Receive requests from other Gor instances on 28020 port, and redirect output to staging\n\tgor --input-tcp :28020 --output-http staging.com")
+	flag.Var(&Settings.outputTCP, "output-tcp", "Used for internal communication between Gor instances. Example: \n\t# Listen for requests on 80 port and forward them to other Gor instance on 28020 port\n\tgor --input-raw :80 --output-tcp replay.local:28020")
+	flag.BoolVar(&Settings.outputTCPStats, "output-tcp-stats", false, "Report TCP output queue stats to console every 5 seconds.")
+
+	flag.Var(&Settings.inputFile, "input-file", "Read requests from file: \n\tgor --input-file ./requests.gor --output-http staging.com")
+	flag.BoolVar(&Settings.inputFileLoop, "input-file-loop", false, "Loop input files, useful for performance testing.")
+
+	flag.Var(&Settings.outputFile, "output-file", "Write incoming requests to file: \n\tgor --input-raw :80 --output-file ./requests.gor")
+	flag.DurationVar(&Settings.outputFileConfig.flushInterval, "output-file-flush-interval", time.Second, "Interval for forcing buffer flush to the file, default: 1s.")
+	flag.BoolVar(&Settings.outputFileConfig.append, "output-file-append", false, "The flushed chunk is appended to existence file or not. ")
+
+	// Set default
+	Settings.outputFileConfig.sizeLimit.Set("32mb")
+	flag.Var(&Settings.outputFileConfig.sizeLimit, "output-file-size-limit", "Size of each chunk. Default: 32mb")
+	flag.IntVar(&Settings.outputFileConfig.queueLimit, "output-file-queue-limit", 256, "The length of the chunk queue. Default: 256")
+
+	flag.Var(&Settings.inputRAW, "input-raw", "Capture traffic from given port (use RAW sockets and require *sudo* access):\n\t# Capture traffic from 8080 port\n\tgor --input-raw :8080 --output-http staging.com")
+
+	flag.BoolVar(&Settings.inputRAWTrackResponse, "input-raw-track-response", false, "If turned on Gor will track responses in addition to requests, and they will be available to middleware and file output.")
+
+	flag.StringVar(&Settings.inputRAWEngine, "input-raw-engine", "libpcap", "Intercept traffic using `libpcap` (default), and `raw_socket`")
+
+	flag.StringVar(&Settings.inputRAWRealIPHeader, "input-raw-realip-header", "", "If not blank, injects header with given name and real IP value to the request payload. Usually this header should be named: X-Real-IP")
+
+	flag.StringVar(&Settings.middleware, "middleware", "", "Used for modifying traffic using external command")
+
+	// flag.Var(&Settings.inputHTTP, "input-http", "Read requests from HTTP, should be explicitly sent from your application:\n\t# Listen for http on 9000\n\tgor --input-http :9000 --output-http staging.com")
+
+	flag.Var(&Settings.outputHTTP, "output-http", "Forwards incoming requests to given http address.\n\t# Redirect all incoming requests to staging.com address \n\tgor --input-raw :80 --output-http http://staging.com")
+	flag.IntVar(&Settings.outputHTTPConfig.BufferSize, "output-http-response-buffer", 0, "HTTP response buffer size, all data after this size will be discarded.")
+	flag.IntVar(&Settings.outputHTTPConfig.workers, "output-http-workers", 0, "Gor uses dynamic worker scaling by default.  Enter a number to run a set number of workers.")
+	flag.IntVar(&Settings.outputHTTPConfig.redirectLimit, "output-http-redirects", 0, "Enable how often redirects should be followed.")
+	flag.DurationVar(&Settings.outputHTTPConfig.Timeout, "output-http-timeout", 5*time.Second, "Specify HTTP request/response timeout. By default 5s. Example: --output-http-timeout 30s")
+
+	flag.BoolVar(&Settings.outputHTTPConfig.stats, "output-http-stats", false, "Report http output queue stats to console every 5 seconds.")
+	flag.BoolVar(&Settings.outputHTTPConfig.OriginalHost, "http-original-host", false, "Normally gor replaces the Host http header with the host supplied with --output-http.  This option disables that behavior, preserving the original Host header.")
+	flag.BoolVar(&Settings.outputHTTPConfig.Debug, "output-http-debug", false, "Enables http debug output.")
+
+	flag.StringVar(&Settings.outputHTTPConfig.elasticSearch, "output-http-elasticsearch", "", "Send request and response stats to ElasticSearch:\n\tgor --input-raw :8080 --output-http staging.com --output-http-elasticsearch 'es_host:api_port/index_name'")
+
+	flag.StringVar(&Settings.outputKafkaConfig.host, "output-kafka-host", "", "Send request and response stats to Kafka:\n\tgor --input-raw :8080 --output-kafka-host '192.168.0.1:9092,192.168.0.2:9092'")
+	flag.StringVar(&Settings.outputKafkaConfig.topic, "output-kafka-topic", "", "Send request and response stats to Kafka:\n\tgor --input-raw :8080 --output-kafka-topic 'kafka-log'")
+
+	flag.Var(&Settings.modifierConfig.headers, "http-set-header", "Inject additional headers to http reqest:\n\tgor --input-raw :8080 --output-http staging.com --http-set-header 'User-Agent: Gor'")
+	flag.Var(&Settings.modifierConfig.headers, "output-http-header", "WARNING: `--output-http-header` DEPRECATED, use `--http-set-header` instead")
+
+	flag.Var(&Settings.modifierConfig.params, "http-set-param", "Set request url param, if param already exists it will be overwritten:\n\tgor --input-raw :8080 --output-http staging.com --http-set-param api_key=1")
+
+	flag.Var(&Settings.modifierConfig.methods, "http-allow-method", "Whitelist of HTTP methods to replay. Anything else will be dropped:\n\tgor --input-raw :8080 --output-http staging.com --http-allow-method GET --http-allow-method OPTIONS")
+	flag.Var(&Settings.modifierConfig.methods, "output-http-method", "WARNING: `--output-http-method` DEPRECATED, use `--http-allow-method` instead")
+
+	flag.Var(&Settings.modifierConfig.urlRegexp, "http-allow-url", "A regexp to match requests against. Filter get matched against full url with domain. Anything else will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-allow-url ^www.")
+	flag.Var(&Settings.modifierConfig.urlRegexp, "output-http-url-regexp", "WARNING: `--output-http-url-regexp` DEPRECATED, use `--http-allow-url` instead")
+
+	flag.Var(&Settings.modifierConfig.urlNegativeRegexp, "http-disallow-url", "A regexp to match requests against. Filter get matched against full url with domain. Anything else will be forwarded:\n\t gor --input-raw :8080 --output-http staging.com --http-disallow-url ^www.")
+
+	flag.Var(&Settings.modifierConfig.urlRewrite, "http-rewrite-url", "Rewrite the request url based on a mapping:\n\tgor --input-raw :8080 --output-http staging.com --http-rewrite-url /v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
+	flag.Var(&Settings.modifierConfig.urlRewrite, "output-http-rewrite-url", "WARNING: `--output-http-rewrite-url` DEPRECATED, use `--http-rewrite-url` instead")
+
+	flag.Var(&Settings.modifierConfig.headerFilters, "http-allow-header", "A regexp to match a specific header against. Requests with non-matching headers will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-allow-header api-version:^v1")
+	flag.Var(&Settings.modifierConfig.headerFilters, "output-http-header-filter", "WARNING: `--output-http-header-filter` DEPRECATED, use `--http-allow-header` instead")
+
+	flag.Var(&Settings.modifierConfig.headerNegativeFilters, "http-disallow-header", "A regexp to match a specific header against. Requests with matching headers will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-disallow-header \"User-Agent: Replayed by Gor\"")
+
+	flag.Var(&Settings.modifierConfig.headerHashFilters, "http-header-limiter", "Takes a fraction of requests, consistently taking or rejecting a request based on the FNV32-1A hash of a specific header:\n\t gor --input-raw :8080 --output-http staging.com --http-header-imiter user-id:25%")
+	flag.Var(&Settings.modifierConfig.headerHashFilters, "output-http-header-hash-filter", "WARNING: `output-http-header-hash-filter` DEPRECATED, use `--http-header-hash-limiter` instead")
+
+	flag.Var(&Settings.modifierConfig.paramHashFilters, "http-param-limiter", "Takes a fraction of requests, consistently taking or rejecting a request based on the FNV32-1A hash of a specific GET param:\n\t gor --input-raw :8080 --output-http staging.com --http-param-limiter user_id:25%")
+}
+
+var previousDebugTime int64
+var debugMutex sync.Mutex
+
+// Debug gets called only if --verbose flag specified
+func Debug(args ...interface{}) {
+	if Settings.verbose {
+		debugMutex.Lock()
+		now := time.Now()
+		diff := float64(now.UnixNano()-previousDebugTime) / 1000000
+		previousDebugTime = now.UnixNano()
+		debugMutex.Unlock()
+
+		fmt.Printf("[DEBUG][PID %d][%d][%fms] ", os.Getpid(), now.UnixNano(), diff)
+		fmt.Println(args...)
+	}
+}

test_input.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"time"
+)
+
+// TestInput used for testing purpose, it allows emitting requests on demand
+type TestInput struct {
+	data chan []byte
+	skipHeader bool
+}
+
+// NewTestInput constructor for TestInput
+func NewTestInput() (i *TestInput) {
+	i = new(TestInput)
+	i.data = make(chan []byte, 100)
+
+	return
+}
+
+func (i *TestInput) Read(data []byte) (int, error) {
+	buf := <-i.data
+
+	var header []byte
+
+	if !i.skipHeader {
+		header = payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1)
+		copy(data[0:len(header)], header)
+		copy(data[len(header):], buf)
+	} else {
+		copy(data, buf)
+	}
+
+	return len(buf) + len(header), nil
+}
+
+func (i *TestInput) EmitBytes(data []byte) {
+	i.data <- data
+}
+
+// EmitGET emits GET request without headers
+func (i *TestInput) EmitGET() {
+	i.data <- []byte("GET / HTTP/1.1\r\n\r\n")
+}
+
+// EmitPOST emits POST request with Content-Length
+func (i *TestInput) EmitPOST() {
+	i.data <- []byte("POST /pub/WWW/ HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+}
+
+// EmitChunkedPOST emits POST request with `Transfer-Encoding: chunked` and chunked body
+func (i *TestInput) EmitChunkedPOST() {
+	i.data <- []byte("POST /pub/WWW/ HTTP/1.1\r\nHost: www.w3.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
+}
+
+// EmitLargePOST emits POST request with large payload (5mb)
+func (i *TestInput) EmitLargePOST() {
+	size := 5 * 1024 * 1024 // 5 MB
+	rb := make([]byte, size)
+	rand.Read(rb)
+
+	rs := base64.URLEncoding.EncodeToString(rb)
+
+	i.data <- []byte("POST / HTTP/1.1\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
+	Debug("Sent large POST")
+}
+
+// EmitSizedPOST emit a POST with a payload set to a supplied size
+func (i *TestInput) EmitSizedPOST(payloadSize int) {
+	rb := make([]byte, payloadSize)
+	rand.Read(rb)
+
+	rs := base64.URLEncoding.EncodeToString(rb)
+
+	i.data <- []byte("POST / HTTP/1.1\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
+	Debug("Sent large POST")
+}
+
+// EmitOPTIONS emits OPTIONS request, similar to GET
+func (i *TestInput) EmitOPTIONS() {
+	i.data <- []byte("OPTIONS / HTTP/1.1\nHost: www.w3.org\r\n\r\n")
+}
+
+func (i *TestInput) String() string {
+	return "Test Input"
+}