fix: ipv6 support

Bump golang.org/x/net from 0.0.0-20220531201128-c960675eff93 to 0.7.0

.github/sower.hcl

@@ -0,0 +1,99 @@
+# 远程、上游连接方式
+remote {
+    type = "sower"
+    addr = "proxy.com"
+    password = "I_am_Passw0rd"
+    # type="socks5"
+    # addr="127.0.0.1:7890"
+}
+
+dns {
+    disable = false
+    # 监听该 IP 的 UDP(53)、TCP(80、443) 端口，DNS 会将请求导向这个地址
+    serve_ips = ["127.0.0.1"]
+    # 监听的网络接口
+    serve_iface = "lo"
+    # 必填，优先使用 DHCP 中的 DNS 服务器，如果没有则使用该地址
+    fallback = "223.5.5.5"
+}
+
+socks_5 {
+    disable = false
+    # 不写 IP 则监听所有 IP
+    addr = "127.0.0.1:1080"
+}
+
+# 路由规则，各规则优先级:
+# 禁止访问规则 > 直接访问规则 > 代理访问规则 > GEOIP 规则
+# file 字段可填 URL 或本地文件路径，URL 将通过代理请求
+
+# 禁止访问规则。被命中的请求，将被禁止访问。可用于广告过滤之类的目的
+router "block" {
+    file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/adlist/adlist.txt"
+    rules = []
+}
+
+# 直接访问规则。被命中的请求，将被直接访问，不再通过代理
+router "direct" {
+    file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chinalist/chinalist.txt"
+    rules = [
+      "imap.*.*",
+      "imap.*.*.*",
+      "smtp.*.*",
+      "smtp.*.*.*",
+      "pop.*.*",
+      "pop.*.*.*",
+      "pop3.*.*",
+      "pop3.*.*.*",
+      "**.cn",
+      ]
+}
+
+# 代理访问规则。被命中的请求，将通过代理进行转发
+router "proxy" {
+    file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/gfwlist/gfwlist.txt"
+    rules = [
+      "**.google.*",
+      "**.goo.gl",
+      "**.googleusercontent.com",
+      "**.googleapis.com",
+      "*.googlesource.com",
+      "**.youtube.com",
+      "**.ytimg.com",
+      "**.ggpht.com",
+      "**.googlevideo.com",
+      "**.facebook.com",
+      "**.fbcdn.net",
+      "**.twitter.com",
+      "**.twimg.com",
+      "**.blogspot.com",
+      "**.appspot.com",
+      "**.wikipedia.org",
+      "**.wikimedia.org",
+      "*.cloudfront.net",
+      "**.amazon.com",
+      "**.amazonaws.com",
+      "*.githubusercontent.com",
+      "*.githubassets.com",
+      "*.github.*",
+      "lookup-api.apple.com",
+    ]
+}
+
+# GEOIP 规则。大陆境内的 IP，将直接访问。
+# 非大陆境内的 IP，将通过另一套检测逻辑，确定是否需要进行代理。
+# 为避免误伤一些非标页面端口(除 80/443 外)，该规则只在 Socks5 模式下生效
+router "country" {
+    // mmdb = "Country.mmdb"  # https://github.com/alecthw/mmdb_china_ip_list
+    file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chnroute/chnroute.txt"
+    rules = [
+        "127.0.0.0/8",
+        "172.16.0.0/12",
+        "192.168.0.0/16",
+        "10.0.0.0/8",
+        "17.0.0.0/8",
+        "100.64.0.0/10",
+        "224.0.0.0/4",
+        "fe80::/10",
+    ]
+}

.github/sower.plist

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>Label</key>
+		<string>sower</string>
+		<key>ProgramArguments</key>
+		<array>
+			<string>/usr/local/bin/sower</string>
+			<string>-f</string>
+			<string>/usr/local/etc/sower/sower.hcl</string>
+		</array>
+		<key>KeepAlive</key>
+            <true/>
+		<key>RunAtLoad</key>
+            <true/>
+        <key>WorkingDirectory</key>
+            <string>/usr/local/etc/sower</string>
+	</dict>
+</plist>

.github/sower.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=sower client service
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/etc/sower
+ExecStart=/usr/local/bin/sower -f /etc/sower/sower.hcl
+Restart=on-failure
+RestartSec=1min
+
+[Install]
+WantedBy=multi-user.target

.github/sower.toml

@@ -0,0 +1,92 @@
+[remote] # 远程、上游连接方式
+type = "sower"
+addr = "proxy.com"
+password = "I_am_Passw0rd"
+# type: "socks5"
+# addr: "127.0.0.1:7890"
+
+[dns]
+disable = false
+# 监听该 IP 的 UDP(53)、TCP(80、443) 端口，DNS 会将请求导向这个地址
+serve_ips = ["127.0.0.1"]
+# 监听的网络接口
+# serve_iface = "lo"
+
+# 必填，优先使用 DHCP 中的 DNS 服务器，如果没有则使用该地址
+fallback = "223.5.5.5"
+
+[socks_5]
+disable = false
+# 不写 IP 则监听所有 IP
+addr = "127.0.0.1:1080"
+
+# 路由规则，各规则优先级:
+# 禁止访问规则 > 直接访问规则 > 代理访问规则 > GEOIP 规则
+# file 字段可填 URL 或本地文件路径，URL 将通过代理请求
+
+# 禁止访问规则。被命中的请求，将被禁止访问。可用于广告过滤之类的目的
+[router.block]
+file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/adlist/adlist.txt"
+rules = []
+
+# 直接访问规则。被命中的请求，将被直接访问，不再通过代理
+[router.direct]
+file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chinalist/chinalist.txt"
+rules = [
+  "imap.*.*",
+  "imap.*.*.*",
+  "smtp.*.*",
+  "smtp.*.*.*",
+  "pop.*.*",
+  "pop.*.*.*",
+  "pop3.*.*",
+  "pop3.*.*.*",
+  "**.cn",
+]
+
+# 代理访问规则。被命中的请求，将通过代理进行转发
+[router.proxy]
+file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/gfwlist/gfwlist.txt"
+rules = [
+  "**.google.*",
+  "**.goo.gl",
+  "**.googleusercontent.com",
+  "**.googleapis.com",
+  "*.googlesource.com",
+  "**.youtube.com",
+  "**.ytimg.com",
+  "**.ggpht.com",
+  "**.googlevideo.com",
+  "**.facebook.com",
+  "**.fbcdn.net",
+  "**.twitter.com",
+  "**.twimg.com",
+  "**.blogspot.com",
+  "**.appspot.com",
+  "**.wikipedia.org",
+  "**.wikimedia.org",
+  "*.cloudfront.net",
+  "**.amazon.com",
+  "**.amazonaws.com",
+  "*.githubusercontent.com",
+  "*.githubassets.com",
+  "*.github.*",
+  "lookup-api.apple.com",
+]
+
+# GEOIP 规则。大陆境内的 IP，将直接访问。
+# 非大陆境内的 IP，将通过另一套检测逻辑，确定是否需要进行代理。
+# 为避免误伤一些非标页面端口(除 80/443 外)，该规则只在 Socks5 模式下生效
+[router.country]
+mmdb = "Country.mmdb" # https://github.com/alecthw/mmdb_china_ip_list
+file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chnroute/chnroute.txt"
+rules = [
+  "127.0.0.0/8",
+  "172.16.0.0/12",
+  "192.168.0.0/16",
+  "10.0.0.0/8",
+  "17.0.0.0/8",
+  "100.64.0.0/10",
+  "224.0.0.0/4",
+  "fe80::/10",
+]

.github/sower.yaml

@@ -0,0 +1,89 @@
+remote: # 远程、上游连接方式
+  type: "sower"
+  addr: "proxy.com"
+  password: "I_am_Passw0rd"
+  # type: "socks5"
+  # addr: "127.0.0.1:7890"
+
+dns:
+  disable: false
+  # 监听该 IP 的 UDP(53)、TCP(80、443) 端口，DNS 会将请求导向这个地址
+  serve_ips: 
+    - "127.0.0.1"
+  # 监听的网络接口
+  serve_iface: "lo"
+  # 必填，优先使用 DHCP 中的 DNS 服务器，如果没有则使用该地址
+  fallback: "223.5.5.5"
+
+socks_5:
+  disable: false
+  # 不写 IP 则监听所有 IP
+  addr: "127.0.0.1:1080"
+
+# 路由规则，各规则优先级:
+# 禁止访问规则 > 直接访问规则 > 代理访问规则 > GEOIP 规则
+# file 字段可填 URL 或本地文件路径，URL 将通过代理请求
+router:
+  # 禁止访问规则。被命中的请求，将被禁止访问。可用于广告过滤之类的目的
+  block:
+    file: "https://raw.githubusercontent.com/pexcn/daily/gh-pages/adlist/adlist.txt"
+    rules: []
+
+  # 直接访问规则。被命中的请求，将被直接访问，不再通过代理
+  direct:
+    file: "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chinalist/chinalist.txt"
+    rules:
+      - "imap.*.*"
+      - "imap.*.*.*"
+      - "smtp.*.*"
+      - "smtp.*.*.*"
+      - "pop.*.*"
+      - "pop.*.*.*"
+      - "pop3.*.*"
+      - "pop3.*.*.*"
+      - "**.cn"
+
+  # 代理访问规则。被命中的请求，将通过代理进行转发
+  proxy:
+    file: "https://raw.githubusercontent.com/pexcn/daily/gh-pages/gfwlist/gfwlist.txt"
+    rules:
+      - "**.google.*"
+      - "**.goo.gl"
+      - "**.googleusercontent.com"
+      - "**.googleapis.com"
+      - "*.googlesource.com"
+      - "**.youtube.com"
+      - "**.ytimg.com"
+      - "**.ggpht.com"
+      - "**.googlevideo.com"
+      - "**.facebook.com"
+      - "**.fbcdn.net"
+      - "**.twitter.com"
+      - "**.twimg.com"
+      - "**.blogspot.com"
+      - "**.appspot.com"
+      - "**.wikipedia.org"
+      - "**.wikimedia.org"
+      - "*.cloudfront.net"
+      - "**.amazon.com"
+      - "**.amazonaws.com"
+      - "*.githubusercontent.com"
+      - "*.githubassets.com"
+      - "*.github.*"
+      - "lookup-api.apple.com"
+
+  # GEOIP 规则。大陆境内的 IP，将直接访问。
+  # 非大陆境内的 IP，将通过另一套检测逻辑，确定是否需要进行代理。
+  # 为避免误伤一些非标页面端口(除 80/443 外)，该规则只在 Socks5 模式下生效
+  country:
+    mmdb: "Country.mmdb" # https://github.com/alecthw/mmdb_china_ip_list
+    file: "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chnroute/chnroute.txt"
+    rules:
+      - "127.0.0.0/8"
+      - "172.16.0.0/12"
+      - "192.168.0.0/16"
+      - "10.0.0.0/8"
+      - "17.0.0.0/8"
+      - "100.64.0.0/10"
+      - "224.0.0.0/4"
+      - "fe80::/10"

.github/sower_run.vbs

@@ -0,0 +1 @@
+CreateObject("WScript.Shell").Run "C:\Software\Sower\sower.exe -f sower.hcl",0

.github/sowerd.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=sowerd server service
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/sowerd
+Environment="FAKE_SITE=127.0.0.1:8080"
+Environment="PASSWORD=I_am_Passw0rd"
+Restart=on-failure
+RestartSec=1min
+
+[Install]
+WantedBy=multi-user.target

.github/workflows/master.yml

@@ -0,0 +1,18 @@
+name: Go
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          go-version: ^1.17
+      - uses: actions/checkout@v2
+
+      - name: test and build
+        run: |
+          make

.github/workflows/release.yml

@@ -0,0 +1,52 @@
+name: Release
+on:
+  push:
+    tags:
+      - "v*.*.*"
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          go-version: ^1.18
+      - uses: actions/checkout@v2
+
+      - name: build matrix
+        run: |
+          mv .github/* . || true
+
+          make build GO='GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go'
+          tar czvf sower-linux-amd64.tar.gz sower sowerd sower.hcl sower.yaml sower.toml sower.service sowerd.service
+          make clean
+          make build GO='GOOS=linux GOARCH=arm CGO_ENABLED=0 go'
+          tar czvf sower-linux-arm.tar.gz sower sowerd sower.hcl sower.yaml sower.toml sower.service sowerd.service
+          make clean
+          make build GO='GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go'
+          tar czvf sower-linux-arm64.tar.gz sower sowerd sower.hcl sower.yaml sower.toml sower.service sowerd.service
+          make clean
+          make build GO='GOOS=linux GOARCH=mips CGO_ENABLED=0 go'
+          tar czvf sower-linux-mips.tar.gz sower sowerd sower.hcl sower.yaml sower.toml sower.service sowerd.service
+          make clean
+          make build GO='GOOS=linux GOARCH=mipsle CGO_ENABLED=0 go'
+          tar czvf sower-linux-mipsle.tar.gz sower sowerd sower.hcl sower.yaml sower.toml sower.service sowerd.service
+          make clean
+
+          make build GO='GOOS=darwin GOARCH=amd64 CGO_ENABLED=0 go'
+          tar czvf sower-darwin-amd64.tar.gz sower sowerd sower.hcl sower.yaml sower.toml sower.plist
+          make clean
+          make build GO='GOOS=darwin GOARCH=arm64 CGO_ENABLED=0 go'
+          tar czvf sower-darwin-arm64.tar.gz sower sowerd sower.hcl sower.yaml sower.toml sower.plist
+          make clean
+
+          make build GO='GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go'
+          mv sower sower.exe
+          mv sowerd sowerd.exe
+          tar czvf sower-windows-amd64.tar.gz sower.exe sowerd.exe sower.hcl sower.yaml sower.toml sower_run.vbs
+          make clean
+
+      - uses: ncipollo/release-action@v1
+        with:
+          artifacts: "*.tar.gz"
+          token: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -12,11 +12,22 @@
 *.out
 
 .DS_Store
-**/.DS_Store
+._*
+*.swp
+*.swo
 .vscode
 .idea
-sower
-cert.pem
-**/cert.pem
-privkey.pem
-**/privkey.pem
+**.env
+/bin
+
+
+**.mmdb
+/cmd/client/client
+/cmd/server/server
+/sower
+/sowerd
+/*.yml
+/*.yaml
+/*.toml
+/*.hcl
+/*.tf

LICENSE

@@ -1,373 +1,22 @@
-Mozilla Public License Version 2.0
-==================================
+MIT License
 
-1. Definitions
---------------
+Copyright (c) 2020 wweir
 
-1.1. "Contributor"
-    means each individual or legal entity that creates, contributes to
-    the creation of, or owns Covered Software.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
 
-1.2. "Contributor Version"
-    means the combination of the Contributions of others (if any) used
-    by a Contributor and that particular Contributor's Contribution.
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
 
-1.3. "Contribution"
-    means Covered Software of a particular Contributor.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
 
-1.4. "Covered Software"
-    means Source Code Form to which the initial Contributor has attached
-    the notice in Exhibit A, the Executable Form of such Source Code
-    Form, and Modifications of such Source Code Form, in each case
-    including portions thereof.
-
-1.5. "Incompatible With Secondary Licenses"
-    means
-
-    (a) that the initial Contributor has attached the notice described
-        in Exhibit B to the Covered Software; or
-
-    (b) that the Covered Software was made available under the terms of
-        version 1.1 or earlier of the License, but not also under the
-        terms of a Secondary License.
-
-1.6. "Executable Form"
-    means any form of the work other than Source Code Form.
-
-1.7. "Larger Work"
-    means a work that combines Covered Software with other material, in
-    a separate file or files, that is not Covered Software.
-
-1.8. "License"
-    means this document.
-
-1.9. "Licensable"
-    means having the right to grant, to the maximum extent possible,
-    whether at the time of the initial grant or subsequently, any and
-    all of the rights conveyed by this License.
-
-1.10. "Modifications"
-    means any of the following:
-
-    (a) any file in Source Code Form that results from an addition to,
-        deletion from, or modification of the contents of Covered
-        Software; or
-
-    (b) any new file in Source Code Form that contains any Covered
-        Software.
-
-1.11. "Patent Claims" of a Contributor
-    means any patent claim(s), including without limitation, method,
-    process, and apparatus claims, in any patent Licensable by such
-    Contributor that would be infringed, but for the grant of the
-    License, by the making, using, selling, offering for sale, having
-    made, import, or transfer of either its Contributions or its
-    Contributor Version.
-
-1.12. "Secondary License"
-    means either the GNU General Public License, Version 2.0, the GNU
-    Lesser General Public License, Version 2.1, the GNU Affero General
-    Public License, Version 3.0, or any later versions of those
-    licenses.
-
-1.13. "Source Code Form"
-    means the form of the work preferred for making modifications.
-
-1.14. "You" (or "Your")
-    means an individual or a legal entity exercising rights under this
-    License. For legal entities, "You" includes any entity that
-    controls, is controlled by, or is under common control with You. For
-    purposes of this definition, "control" means (a) the power, direct
-    or indirect, to cause the direction or management of such entity,
-    whether by contract or otherwise, or (b) ownership of more than
-    fifty percent (50%) of the outstanding shares or beneficial
-    ownership of such entity.
-
-2. License Grants and Conditions
---------------------------------
-
-2.1. Grants
-
-Each Contributor hereby grants You a world-wide, royalty-free,
-non-exclusive license:
-
-(a) under intellectual property rights (other than patent or trademark)
-    Licensable by such Contributor to use, reproduce, make available,
-    modify, display, perform, distribute, and otherwise exploit its
-    Contributions, either on an unmodified basis, with Modifications, or
-    as part of a Larger Work; and
-
-(b) under Patent Claims of such Contributor to make, use, sell, offer
-    for sale, have made, import, and otherwise transfer either its
-    Contributions or its Contributor Version.
-
-2.2. Effective Date
-
-The licenses granted in Section 2.1 with respect to any Contribution
-become effective for each Contribution on the date the Contributor first
-distributes such Contribution.
-
-2.3. Limitations on Grant Scope
-
-The licenses granted in this Section 2 are the only rights granted under
-this License. No additional rights or licenses will be implied from the
-distribution or licensing of Covered Software under this License.
-Notwithstanding Section 2.1(b) above, no patent license is granted by a
-Contributor:
-
-(a) for any code that a Contributor has removed from Covered Software;
-    or
-
-(b) for infringements caused by: (i) Your and any other third party's
-    modifications of Covered Software, or (ii) the combination of its
-    Contributions with other software (except as part of its Contributor
-    Version); or
-
-(c) under Patent Claims infringed by Covered Software in the absence of
-    its Contributions.
-
-This License does not grant any rights in the trademarks, service marks,
-or logos of any Contributor (except as may be necessary to comply with
-the notice requirements in Section 3.4).
-
-2.4. Subsequent Licenses
-
-No Contributor makes additional grants as a result of Your choice to
-distribute the Covered Software under a subsequent version of this
-License (see Section 10.2) or under the terms of a Secondary License (if
-permitted under the terms of Section 3.3).
-
-2.5. Representation
-
-Each Contributor represents that the Contributor believes its
-Contributions are its original creation(s) or it has sufficient rights
-to grant the rights to its Contributions conveyed by this License.
-
-2.6. Fair Use
-
-This License is not intended to limit any rights You have under
-applicable copyright doctrines of fair use, fair dealing, or other
-equivalents.
-
-2.7. Conditions
-
-Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
-in Section 2.1.
-
-3. Responsibilities
--------------------
-
-3.1. Distribution of Source Form
-
-All distribution of Covered Software in Source Code Form, including any
-Modifications that You create or to which You contribute, must be under
-the terms of this License. You must inform recipients that the Source
-Code Form of the Covered Software is governed by the terms of this
-License, and how they can obtain a copy of this License. You may not
-attempt to alter or restrict the recipients' rights in the Source Code
-Form.
-
-3.2. Distribution of Executable Form
-
-If You distribute Covered Software in Executable Form then:
-
-(a) such Covered Software must also be made available in Source Code
-    Form, as described in Section 3.1, and You must inform recipients of
-    the Executable Form how they can obtain a copy of such Source Code
-    Form by reasonable means in a timely manner, at a charge no more
-    than the cost of distribution to the recipient; and
-
-(b) You may distribute such Executable Form under the terms of this
-    License, or sublicense it under different terms, provided that the
-    license for the Executable Form does not attempt to limit or alter
-    the recipients' rights in the Source Code Form under this License.
-
-3.3. Distribution of a Larger Work
-
-You may create and distribute a Larger Work under terms of Your choice,
-provided that You also comply with the requirements of this License for
-the Covered Software. If the Larger Work is a combination of Covered
-Software with a work governed by one or more Secondary Licenses, and the
-Covered Software is not Incompatible With Secondary Licenses, this
-License permits You to additionally distribute such Covered Software
-under the terms of such Secondary License(s), so that the recipient of
-the Larger Work may, at their option, further distribute the Covered
-Software under the terms of either this License or such Secondary
-License(s).
-
-3.4. Notices
-
-You may not remove or alter the substance of any license notices
-(including copyright notices, patent notices, disclaimers of warranty,
-or limitations of liability) contained within the Source Code Form of
-the Covered Software, except that You may alter any license notices to
-the extent required to remedy known factual inaccuracies.
-
-3.5. Application of Additional Terms
-
-You may choose to offer, and to charge a fee for, warranty, support,
-indemnity or liability obligations to one or more recipients of Covered
-Software. However, You may do so only on Your own behalf, and not on
-behalf of any Contributor. You must make it absolutely clear that any
-such warranty, support, indemnity, or liability obligation is offered by
-You alone, and You hereby agree to indemnify every Contributor for any
-liability incurred by such Contributor as a result of warranty, support,
-indemnity or liability terms You offer. You may include additional
-disclaimers of warranty and limitations of liability specific to any
-jurisdiction.
-
-4. Inability to Comply Due to Statute or Regulation
----------------------------------------------------
-
-If it is impossible for You to comply with any of the terms of this
-License with respect to some or all of the Covered Software due to
-statute, judicial order, or regulation then You must: (a) comply with
-the terms of this License to the maximum extent possible; and (b)
-describe the limitations and the code they affect. Such description must
-be placed in a text file included with all distributions of the Covered
-Software under this License. Except to the extent prohibited by statute
-or regulation, such description must be sufficiently detailed for a
-recipient of ordinary skill to be able to understand it.
-
-5. Termination
---------------
-
-5.1. The rights granted under this License will terminate automatically
-if You fail to comply with any of its terms. However, if You become
-compliant, then the rights granted under this License from a particular
-Contributor are reinstated (a) provisionally, unless and until such
-Contributor explicitly and finally terminates Your grants, and (b) on an
-ongoing basis, if such Contributor fails to notify You of the
-non-compliance by some reasonable means prior to 60 days after You have
-come back into compliance. Moreover, Your grants from a particular
-Contributor are reinstated on an ongoing basis if such Contributor
-notifies You of the non-compliance by some reasonable means, this is the
-first time You have received notice of non-compliance with this License
-from such Contributor, and You become compliant prior to 30 days after
-Your receipt of the notice.
-
-5.2. If You initiate litigation against any entity by asserting a patent
-infringement claim (excluding declaratory judgment actions,
-counter-claims, and cross-claims) alleging that a Contributor Version
-directly or indirectly infringes any patent, then the rights granted to
-You by any and all Contributors for the Covered Software under Section
-2.1 of this License shall terminate.
-
-5.3. In the event of termination under Sections 5.1 or 5.2 above, all
-end user license agreements (excluding distributors and resellers) which
-have been validly granted by You or Your distributors under this License
-prior to termination shall survive termination.
-
-************************************************************************
-*                                                                      *
-*  6. Disclaimer of Warranty                                           *
-*  -------------------------                                           *
-*                                                                      *
-*  Covered Software is provided under this License on an "as is"       *
-*  basis, without warranty of any kind, either expressed, implied, or  *
-*  statutory, including, without limitation, warranties that the       *
-*  Covered Software is free of defects, merchantable, fit for a        *
-*  particular purpose or non-infringing. The entire risk as to the     *
-*  quality and performance of the Covered Software is with You.        *
-*  Should any Covered Software prove defective in any respect, You     *
-*  (not any Contributor) assume the cost of any necessary servicing,   *
-*  repair, or correction. This disclaimer of warranty constitutes an   *
-*  essential part of this License. No use of any Covered Software is   *
-*  authorized under this License except under this disclaimer.         *
-*                                                                      *
-************************************************************************
-
-************************************************************************
-*                                                                      *
-*  7. Limitation of Liability                                          *
-*  --------------------------                                          *
-*                                                                      *
-*  Under no circumstances and under no legal theory, whether tort      *
-*  (including negligence), contract, or otherwise, shall any           *
-*  Contributor, or anyone who distributes Covered Software as          *
-*  permitted above, be liable to You for any direct, indirect,         *
-*  special, incidental, or consequential damages of any character      *
-*  including, without limitation, damages for lost profits, loss of    *
-*  goodwill, work stoppage, computer failure or malfunction, or any    *
-*  and all other commercial damages or losses, even if such party      *
-*  shall have been informed of the possibility of such damages. This   *
-*  limitation of liability shall not apply to liability for death or   *
-*  personal injury resulting from such party's negligence to the       *
-*  extent applicable law prohibits such limitation. Some               *
-*  jurisdictions do not allow the exclusion or limitation of           *
-*  incidental or consequential damages, so this exclusion and          *
-*  limitation may not apply to You.                                    *
-*                                                                      *
-************************************************************************
-
-8. Litigation
--------------
-
-Any litigation relating to this License may be brought only in the
-courts of a jurisdiction where the defendant maintains its principal
-place of business and such litigation shall be governed by laws of that
-jurisdiction, without reference to its conflict-of-law provisions.
-Nothing in this Section shall prevent a party's ability to bring
-cross-claims or counter-claims.
-
-9. Miscellaneous
-----------------
-
-This License represents the complete agreement concerning the subject
-matter hereof. If any provision of this License is held to be
-unenforceable, such provision shall be reformed only to the extent
-necessary to make it enforceable. Any law or regulation which provides
-that the language of a contract shall be construed against the drafter
-shall not be used to construe this License against a Contributor.
-
-10. Versions of the License
----------------------------
-
-10.1. New Versions
-
-Mozilla Foundation is the license steward. Except as provided in Section
-10.3, no one other than the license steward has the right to modify or
-publish new versions of this License. Each version will be given a
-distinguishing version number.
-
-10.2. Effect of New Versions
-
-You may distribute the Covered Software under the terms of the version
-of the License under which You originally received the Covered Software,
-or under the terms of any subsequent version published by the license
-steward.
-
-10.3. Modified Versions
-
-If you create software not governed by this License, and you want to
-create a new license for such software, you may create and use a
-modified version of this License if you rename the license and remove
-any references to the name of the license steward (except to note that
-such modified license differs from this License).
-
-10.4. Distributing Source Code Form that is Incompatible With Secondary
-Licenses
-
-If You choose to distribute Source Code Form that is Incompatible With
-Secondary Licenses under the terms of this version of the License, the
-notice described in Exhibit B of this License must be attached.
-
-Exhibit A - Source Code Form License Notice
--------------------------------------------
-
-  This Source Code Form is subject to the terms of the Mozilla Public
-  License, v. 2.0. If a copy of the MPL was not distributed with this
-  file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-If it is not possible or desirable to put the notice in a particular
-file, then You may include the notice in a location (such as a LICENSE
-file in a relevant directory) where a recipient would be likely to look
-for such a notice.
-
-You may add additional accurate notices of copyright ownership.
-
-Exhibit B - "Incompatible With Secondary Licenses" Notice
----------------------------------------------------------
-
-  This Source Code Form is "Incompatible With Secondary Licenses", as
-  defined by the Mozilla Public License, v. 2.0.

Makefile

@@ -1,26 +1,25 @@
-SERVER:=127.0.0.1:5533
+MAKEFLAGS += --jobs all
+GO:=CGO_ENABLED=0 go
 
-default: build
+default: test build
 
-generate:
-	go generate ./...
+test:
+	${GO} vet ./...
+	${GO} test ./...
 
-build:
-	GOBIN=$(PWD) go install -v
+build: sower sowerd
+.PHONY: sower
+sower:
+	${GO} build -ldflags "\
+		-X main.version=$(shell git describe --tags --always) \
+		-X main.date=$(shell date +%Y-%m-%d)" \
+		-o sower ./cmd/sower
+.PHONY: sowerd
+sowerd:
+	${GO} build -ldflags "\
+		-X main.version=$(shell git describe --tags --always) \
+		-X main.date=$(shell date +%Y-%m-%d)" \
+		-o sowerd ./cmd/sowerd
 
-kill:
-	sudo pkill -9 sower || true
-
-client: build kill
-	sudo $(PWD)/sower -f conf/sower.toml -logtostderr
-
-server: build kill
-	$(PWD)/sower -n QUIC -logtostderr -v 1
-
-run: build kill
-	$(PWD)/sower -n QUIC -logtostderr -v 1  &
-	sudo $(PWD)/sower -f conf/sower.toml -logtostderr &
-	sleep 1
-	@curl 127.0.0.1
-	sleep 1
-	sudo pkill -9 sower || true
+clean:
+	rm -f sower sowerd sower.exe sowerd.exe

README.md

@@ -1,48 +1,72 @@
 # sower
-Yet another cross platform transparent proxy tool
 
-## architecture
-```
-          request target servers
-<-------------+              +------------->
-              |              |
-              |              |
-      +------------server-------------+
-      |       | relay service|        |
-      | +-----+---------------------+ |
-      | |                           | |
-      | | parsr http(s) target url  | |
-      | |                           | |
-      | +---------------------------+ |
-      |                               |
-      +--------^----------------------+
-               |           request domain server
-       quic connection          +---------->
-               |                |
-      +--------+---client+------+-----+
-      |                  |            |
-      |                  |            |
-      |  relay service   |     dns    |
-      |                  |    server  |
-      |                  |            |
-      |       127.0.0.1 or other      |
-      |                  |            |
-      +-------^----------+---^----^---+
-              |              |    |
-              |              |    |   +----->
-              |   +----------+    |   |
-              2   1               1   2
-              +   +               +   +
-          block request       normal request
+[![GitHub release](http://img.shields.io/github/release/wweir/sower.svg?style=popout)](https://github.com/wweir/sower/releases)
+[![Actions Status](https://github.com/wweir/sower/workflows/Go/badge.svg)](https://github.com/wweir/sower/actions)
+[![GitHub issue](https://img.shields.io/github/issues/wweir/sower.svg?style=popout)](https://github.com/wweir/sower/issues)
+[![GitHub star](https://img.shields.io/github/stars/wweir/sower.svg?style=popout)](https://github.com/wweir/sower/stargazers)
+[![GitHub license](https://img.shields.io/github/license/wweir/sower.svg?style=popout)](LICENSE)
 
-```
+中文介绍见 [Wiki](https://github.com/wweir/sower/wiki)
 
-## install
-1. install server on `server node` by `make server`
-2. write config file, example: [conf/sower.toml](https://github.com/wweir/sower/blob/master/conf/sower.toml)
-3. install client on `client node` by `make client`
-4. add `127.0.0.1` as you first domain server
+Sower is a cross-platform intelligent transparent proxy tool. It provides both socks5 proxy and DNS-based proxy. All these kinds of proxies support intelligent routing.
 
-## todo
-- [ ] authenticate
-- [ ] broker
+If you already have another proxy solution, you can use its socks5(h) service as a parent proxy to enjoy sower's intelligent routing.
+
+## Installation
+
+To enjoy sower, you need to deploy sower on both server-side(sowerd) and client-side(sower).
+
+## Sowerd
+
+_If you want to use sower as a secondary proxy to provide intelligent routing, you can skip sowerd._
+
+On the server-side, sowerd runs just like a web server proxy. It will bind two ports `80` / `443`.
+
+You can use your own certificate or the certificate automatically applied for by sowerd from [`Let's Encrypt`](https://letsencrypt.org/).
+
+There are two ways to run the sowerd service:
+
+1. Run the command with root permission
+
+   ```shell
+   # sowerd -password XXX -fake_site 127.0.0.1:8080
+   ```
+
+2. Install as a systemd service
+
+   ```service
+   [Unit]
+   Description=sower server service
+   After=network.target
+
+   [Service]
+   Type=simple
+   ExecStart=/usr/local/bin/sowerd
+   Environment="FAKE_SITE=127.0.0.1:8080"
+   Environment="PASSWORD=XXX"
+
+   [Install]
+   WantedBy=multi-user.target
+   ```
+
+## Sower
+
+A config file is required on the sower client side. [Here](https://github.com/wweir/sower/wiki/sower.hcl) is a usable example in China.
+
+`Sower` will bind 4 ports by default with root permission. They are: `udp(53)` / `tcp(80)` / `tcp(443)` / `tcp(1080)`.
+
+After doing the next three steps, you can enjoy the intelligent transparent proxy solution:
+
+1. Run the command with root permission:
+
+   ```shell
+   # sower -f sower.hcl
+   ```
+
+2. Change your DNS server to `127.0.0.1`.
+
+3. Set your proxy to `socks5h://127.0.0.1:1080`.
+
+## Architecture
+
+![Architecture diagram](./sower.drawio.svg)

cmd/sower/main.go

@@ -0,0 +1,287 @@
+package main
+
+import (
+	"bufio"
+	"compress/gzip"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/cristalhq/aconfig"
+	"github.com/cristalhq/aconfig/aconfighcl"
+	"github.com/cristalhq/aconfig/aconfigtoml"
+	"github.com/cristalhq/aconfig/aconfigyaml"
+	"github.com/miekg/dns"
+	"github.com/pkg/errors"
+	"github.com/sower-proxy/deferlog/log"
+	"github.com/wweir/sower/pkg/suffixtree"
+	"github.com/wweir/sower/router"
+)
+
+var (
+	version, date string
+
+	conf = struct {
+		Debug bool `default:"false" usage:"debug mode"`
+
+		Remote struct {
+			Type     string `default:"sower" required:"true" usage:"option: sower/trojan/socks5"`
+			Addr     string `required:"true" usage:"proxy address, eg: proxy.com/127.0.0.1:7890"`
+			Password string `usage:"remote proxy password"`
+		}
+
+		DNS struct {
+			Disable    bool   `default:"false" usage:"disable DNS proxy"`
+			Serve      string `usage:"dns server ip"`
+			Serve6     string `usage:"dns server ipv6, eg: ::1"`
+			ServeIface string `usage:"use the IP in the net interface, if serve ip not setted. eg: eth0"`
+			Fallback   string `default:"223.5.5.5" required:"true" usage:"fallback dns server"`
+		}
+		Socks5 struct {
+			Disable bool   `default:"false" usage:"disable sock5 proxy"`
+			Addr    string `default:"127.0.0.1:1080" usage:"socks5 listen address"`
+		} `flag:"socks5"`
+
+		Router struct {
+			Block struct {
+				File       string   `usage:"block list file, local file or remote"`
+				FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
+				Rules      []string `usage:"block list rules"`
+			}
+			Direct struct {
+				File       string   `usage:"direct list file, local file or remote"`
+				FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
+				Rules      []string `usage:"direct list rules"`
+			}
+			Proxy struct {
+				File       string   `usage:"proxy list file, local file or remote"`
+				FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
+				Rules      []string `usage:"proxy list rules"`
+			}
+
+			Country struct {
+				MMDB       string   `usage:"mmdb file"`
+				File       string   `usage:"CIDR block list file, local file or remote"`
+				FilePrefix string   `default:"" usage:"parsed as '<prefix>line_text'"`
+				Rules      []string `usage:"CIDR list rules"`
+			}
+		}
+	}{}
+)
+
+func init() {
+	if err := aconfig.LoaderFor(&conf, aconfig.Config{
+		AllowUnknownFields: true,
+		FileFlag:           "f",
+		FileDecoders: map[string]aconfig.FileDecoder{
+			".yml":  aconfigyaml.New(),
+			".yaml": aconfigyaml.New(),
+			".toml": aconfigtoml.New(),
+			".hcl":  aconfighcl.New(),
+		},
+	}).Load(); err != nil {
+		log.Fatal().Err(err).
+			Interface("config", conf).
+			Msg("Load config")
+	}
+
+	if conf.DNS.ServeIface != "" {
+		iface, err := net.InterfaceByName(conf.DNS.ServeIface)
+		log.DebugFatal(err).Str("iface", conf.DNS.ServeIface).Msg("get iface")
+		addrs, err := iface.Addrs()
+		log.InfoFatal(err).Str("iface", conf.DNS.ServeIface).Msg("get iface addrs")
+		for _, addr := range addrs {
+			ip, _, err := net.ParseCIDR(addr.String())
+			log.InfoFatal(err).Str("iface", conf.DNS.ServeIface).
+				Msg("parse iface addr: " + addr.String())
+
+			if ip.To4() != nil { // ipv4
+				if conf.DNS.Serve == "" {
+					conf.DNS.Serve = ip.String()
+				}
+			} else if ip.IsGlobalUnicast() { // ipv6 must be global unicast
+				if conf.DNS.Serve6 == "" {
+					conf.DNS.Serve6 = ip.String()
+				}
+			}
+		}
+	}
+
+	if !conf.DNS.Disable && conf.DNS.Serve == "" {
+		log.Fatal().Msg("dns serve ip and serve inteface not setted")
+	}
+
+	conf.Router.Direct.Rules = append(conf.Router.Direct.Rules,
+		conf.Remote.Addr, "**.in-addr.arpa", "**.ip6.arpa")
+	log.Info().
+		Str("version", version).
+		Str("date", date).
+		Interface("config", conf).
+		Msg("Starting")
+}
+
+func main() {
+	proxyDial := GenProxyDial(conf.Remote.Type, conf.Remote.Addr, conf.Remote.Password)
+	r := router.NewRouter(conf.DNS.Serve, conf.DNS.Fallback, conf.Router.Country.MMDB, proxyDial)
+	r.BlockRule = suffixtree.NewNodeFromRules(conf.Router.Block.Rules...)
+	r.DirectRule = suffixtree.NewNodeFromRules(conf.Router.Direct.Rules...)
+	r.ProxyRule = suffixtree.NewNodeFromRules(conf.Router.Proxy.Rules...)
+	r.AddCountryCIDRs(conf.Router.Country.Rules...)
+
+	if conf.DNS.Disable {
+		log.Info().Msg("DNS proxy disabled")
+	} else {
+		ips := make([]string, 0, 2)
+		if strings.TrimSpace(conf.DNS.Serve) != "" {
+			ips = append(ips, conf.DNS.Serve)
+		}
+		if strings.TrimSpace(conf.DNS.Serve6) != "" {
+			ips = append(ips, conf.DNS.Serve6)
+		}
+
+		for _, ip := range ips {
+			lnHTTP, err := net.Listen("tcp", net.JoinHostPort(ip, "80"))
+			log.DebugFatal(err).Str("listen_on", net.JoinHostPort(ip, "80")).Msg("listen port 80")
+			go ServeHTTP(lnHTTP, r)
+
+			lnHTTPS, err := net.Listen("tcp", net.JoinHostPort(ip, "443"))
+			log.DebugFatal(err).Str("listen_on", net.JoinHostPort(ip, "443")).Msg("listen port 443")
+			go ServeHTTPS(lnHTTPS, r)
+
+			go func(ip string) {
+				err := dns.ListenAndServe(net.JoinHostPort(ip, "53"), "udp", r)
+				log.InfoFatal(err).Str("listen_on", ip).Msg("serve dns")
+			}(ip)
+		}
+	}
+
+	go func() {
+		if conf.Socks5.Disable {
+			log.Info().Msg("SOCKS5 proxy disabled")
+			return
+		}
+
+		ln, err := net.Listen("tcp", conf.Socks5.Addr)
+		if err != nil {
+			log.Fatal().Err(err).Msg("listen port")
+		}
+		log.Info().Msgf("SOCKS5 proxy listening on %s", conf.Socks5.Addr)
+		go ServeSocks5(ln, r)
+	}()
+
+	start := time.Now()
+	loadRule(r.BlockRule, proxyDial, conf.Router.Block.File, conf.Router.Block.FilePrefix)
+	loadRule(r.DirectRule, proxyDial, conf.Router.Direct.File, conf.Router.Direct.FilePrefix)
+	loadRule(r.ProxyRule, proxyDial, conf.Router.Proxy.File, conf.Router.Proxy.FilePrefix)
+	for line := range fetchRuleFile(proxyDial, conf.Router.Country.File) {
+		r.AddCountryCIDRs(line)
+	}
+
+	log.Info().
+		Dur("took", time.Since(start)).
+		Uint64("blockRule", r.BlockRule.Count).
+		Uint64("directRule", r.DirectRule.Count).
+		Uint64("proxyRule", r.ProxyRule.Count).
+		Msg("Loaded rules, proxy started")
+	runtime.GC()
+	select {}
+}
+
+func loadRule(rule *suffixtree.Node, proxyDial router.ProxyDialFn, file, linePrefix string) {
+	for line := range fetchRuleFile(proxyDial, file) {
+		rule.Add(linePrefix + line)
+	}
+	rule.GC()
+}
+
+func fetchRuleFile(proxyDial router.ProxyDialFn, file string) <-chan string {
+	if file == "" {
+		return make(chan string)
+	}
+
+	var loadFn func() (io.ReadCloser, error)
+	if _, err := os.Stat(file); err == nil {
+		// load rule file from local file
+		loadFn = func() (io.ReadCloser, error) {
+			return os.Open(file)
+		}
+	} else {
+		// load rule file from remote by HTTP
+		client := &http.Client{
+			Transport: &http.Transport{
+				Dial: func(network, addr string) (net.Conn, error) {
+					domain, port, _ := net.SplitHostPort(addr)
+					p, _ := strconv.Atoi(port)
+					return proxyDial("tcp", domain, uint16(p))
+				},
+			},
+		}
+
+		loadFn = func() (io.ReadCloser, error) {
+			req, _ := http.NewRequest(http.MethodGet, file, nil)
+			req.Header.Add("Accept-Encoding", "gzip")
+			resp, err := client.Do(req)
+			if err != nil {
+				return nil, err
+			}
+
+			if resp.StatusCode != http.StatusOK {
+				resp.Body.Close()
+				return nil, errors.Errorf("status code: %d", resp.StatusCode)
+			}
+
+			return resp.Body, nil
+		}
+	}
+
+	// load rule file, retry 10 times
+	rc, err := loadFn()
+	for i := time.Duration(1); i < 10; i++ {
+		if err == nil {
+			break
+		}
+
+		// wait: 28.5s
+		time.Sleep(i * i * 100 * time.Millisecond)
+		rc, err = loadFn()
+	}
+	log.InfoFatal(err).
+		Str("file", file).
+		Msg("fetch rule file")
+
+	ch := make(chan string, 100)
+	go func() {
+		defer rc.Close()
+		defer close(ch)
+		if gr, err := gzip.NewReader(rc); err == nil {
+			rc = gr
+			defer gr.Close()
+		}
+
+		br := bufio.NewReader(rc)
+		for {
+			line, _, err := br.ReadLine()
+			if err == io.EOF {
+				return
+			} else if err != nil {
+				log.Error().Err(err).
+					Str("file", file).
+					Msg("read line")
+				return
+			}
+
+			if strings.TrimSpace(string(line)) == "" {
+				continue
+			}
+
+			ch <- string(line)
+		}
+	}()
+
+	return ch
+}

cmd/sower/proxy.go

@@ -0,0 +1,219 @@
+package main
+
+import (
+	"bufio"
+	"crypto/tls"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/sower-proxy/conns/relay"
+	"github.com/sower-proxy/conns/teeconn"
+	"github.com/sower-proxy/deferlog/log"
+	"github.com/wweir/sower/router"
+	"github.com/wweir/sower/transport"
+	"github.com/wweir/sower/transport/socks5"
+	"github.com/wweir/sower/transport/sower"
+	"github.com/wweir/sower/transport/trojan"
+)
+
+func GenProxyDial(proxyType, proxyHost, proxyPassword string) router.ProxyDialFn {
+	var proxy transport.Transport
+	var dialFn func() (net.Conn, error)
+
+	switch conf.Remote.Type {
+	case "sower":
+		proxy = sower.New(conf.Remote.Password)
+		tlsCfg := &tls.Config{}
+		dialFn = func() (net.Conn, error) {
+			return tls.Dial("tcp", net.JoinHostPort(proxyHost, "443"), tlsCfg)
+		}
+
+	case "trojan":
+		proxy = trojan.New(conf.Remote.Password)
+		tlsCfg := &tls.Config{}
+		dialFn = func() (net.Conn, error) {
+			return tls.Dial("tcp", net.JoinHostPort(proxyHost, "443"), tlsCfg)
+		}
+
+	case "socks5":
+		proxy = socks5.New()
+		dialFn = func() (net.Conn, error) {
+			return net.Dial("tcp", proxyHost)
+		}
+
+	default:
+		log.Fatal().
+			Str("type", conf.Remote.Type).
+			Msg("unknown proxy type")
+	}
+
+	return func(network, host string, port uint16) (net.Conn, error) {
+		if host == "" || port == 0 {
+			return nil, errors.Errorf("invalid addr(%s:%d)", host, port)
+		}
+
+		conn, err := dialFn()
+		if err != nil {
+			return nil, err
+		}
+
+		if err := proxy.Wrap(conn, host, port); err != nil {
+			conn.Close()
+			return nil, err
+		}
+
+		return conn, nil
+	}
+}
+
+func ServeHTTP(ln net.Listener, r *router.Router) {
+	conn, err := ln.Accept()
+	if err != nil {
+		log.Fatal().Err(err).
+			Msg("serve socks5")
+	}
+
+	go ServeHTTP(ln, r)
+	start := time.Now()
+	teeconn := teeconn.New(conn)
+	defer teeconn.Close()
+
+	req, err := http.ReadRequest(bufio.NewReader(teeconn))
+	if err != nil {
+		log.Error().Err(err).Msg("read http request")
+		return
+	}
+
+	rc, err := r.ProxyDial("tcp", req.Host, 80)
+	if err != nil {
+		log.Error().Err(err).
+			Str("host", req.Host).
+			Interface("req", req.URL).
+			Msg("dial proxy")
+		return
+	}
+	defer rc.Close()
+
+	teeconn.Stop().Reread()
+	err = relay.Relay(teeconn, rc)
+	log.DebugWarn(err).
+		Str("host", req.Host).
+		Dur("spend", time.Since(start)).
+		Msg("serve http")
+}
+
+func ServeHTTPS(ln net.Listener, r *router.Router) {
+	conn, err := ln.Accept()
+	if err != nil {
+		log.Fatal().Err(err).
+			Msg("serve socks5")
+	}
+
+	go ServeHTTPS(ln, r)
+	start := time.Now()
+	teeconn := teeconn.New(conn)
+	defer teeconn.Close()
+
+	var domain string
+	tls.Server(teeconn, &tls.Config{
+		GetConfigForClient: func(hello *tls.ClientHelloInfo) (*tls.Config, error) {
+			domain = hello.ServerName
+			return nil, nil
+		},
+	}).Handshake()
+
+	rc, err := r.ProxyDial("tcp", domain, 443)
+	if err != nil {
+		log.Error().Err(err).
+			Str("host", domain).
+			Msg("dial proxy")
+		return
+	}
+	defer rc.Close()
+
+	teeconn.Stop().Reread()
+	err = relay.Relay(teeconn, rc)
+	log.DebugWarn(err).
+		Str("host", domain).
+		Dur("spend", time.Since(start)).
+		Msg("serve http")
+}
+
+func ServeSocks5(ln net.Listener, r *router.Router) {
+	conn, err := ln.Accept()
+	if err != nil {
+		log.Fatal().Err(err).
+			Msg("serve socks5")
+	}
+	go ServeSocks5(ln, r)
+	defer conn.Close()
+
+	teeConn := teeconn.New(conn)
+
+	buf1 := make([]byte, 1)
+	if _, err := teeConn.Read(buf1); err != nil {
+		log.Warn().Err(err).
+			Msg("read socks5 version")
+		return
+	}
+
+	if buf1[0] != 5 {
+		teeConn.Reread()
+		serveHttpProxy(teeConn, r)
+		return
+	}
+
+	teeConn.Stop().Reread()
+	addr, err := socks5.New().Unwrap(teeConn)
+	if err != nil {
+		log.Warn().Err(err).
+			Msgf("parse socks5 target: %s", addr)
+		return
+	}
+
+	host, port := addr.(*socks5.AddrHead).Addr()
+	r.RouteHandle(teeConn, host, port)
+}
+
+func serveHttpProxy(teeConn *teeconn.Conn, r *router.Router) {
+	req, err := http.ReadRequest(bufio.NewReader(teeConn))
+	if err != nil {
+		log.Warn().Err(err).
+			Msg("read http request")
+		return
+	}
+
+	teeConn.Stop()
+	switch req.Method {
+	case "CONNECT":
+		if _, err := teeConn.Write([]byte(req.Proto + " 200 Connection established\r\n\r\n")); err != nil {
+			log.Warn().Err(err).
+				Msg("write https proxy response")
+			return
+		}
+
+		host, port, err := router.ParseHostPort(req.Host, 443)
+		if err != nil {
+			log.Warn().Err(err).
+				Msg("parse https_proxy target")
+			return
+		}
+
+		rc, err := r.ProxyDial("tcp", host, port)
+		if err != nil {
+			log.Warn().Err(err).
+				Str("host", host).
+				Msg("dial proxy")
+			return
+		}
+		defer rc.Close()
+
+		relay.Relay(teeConn, rc)
+
+	default:
+		teeConn.Reread()
+		r.RouteHandle(teeConn, req.Host, 80)
+	}
+}

cmd/sowerd/main.go

@@ -0,0 +1,148 @@
+package main
+
+import (
+	"crypto/tls"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/cristalhq/aconfig"
+	"github.com/sower-proxy/conns/relay"
+	"github.com/sower-proxy/conns/teeconn"
+	"github.com/sower-proxy/deferlog"
+	"github.com/sower-proxy/deferlog/log"
+	"github.com/wweir/sower/transport/sower"
+	"github.com/wweir/sower/transport/trojan"
+	"golang.org/x/crypto/acme/autocert"
+)
+
+var (
+	version, date string
+
+	conf = struct {
+		ServeIP  string `usage:"listen to port 80 443 of this IP, eg: 0.0.0.0"`
+		Password string `required:"true"`
+		FakeSite string `default:"127.0.0.1:8080" usage:"fake site address or directoy"`
+
+		Cert struct {
+			Email string
+			Cert  string
+			Key   string
+		}
+	}{}
+)
+
+func init() {
+	err := aconfig.LoaderFor(&conf, aconfig.Config{}).Load()
+	log.InfoFatal(err).
+		Str("version", version).
+		Str("date", date).
+		Interface("config", conf).
+		Msg("Load config")
+}
+
+func main() {
+	cacheDir, _ := os.UserCacheDir()
+	cacheDir = filepath.Join(cacheDir, "sower")
+	if err := os.MkdirAll(cacheDir, 0600); err != nil {
+		log.Fatal().Err(err).
+			Str("dir", cacheDir).
+			Msg("make cache dir")
+	}
+
+	certManager := autocert.Manager{
+		Prompt: autocert.AcceptTOS,
+		Email:  conf.Cert.Email,
+		Cache:  autocert.DirCache(cacheDir),
+	}
+
+	tlsConf := &tls.Config{
+		GetCertificate: certManager.GetCertificate,
+		MinVersion:     tls.VersionTLS12,
+		NextProtos:     []string{"http/1.1", "h2"},
+	}
+	if conf.Cert.Cert != "" || conf.Cert.Key != "" {
+		cert, err := tls.LoadX509KeyPair(conf.Cert.Cert, conf.Cert.Key)
+		if err != nil {
+			log.Fatal().Err(err).Msg("load certificate")
+		}
+
+		tlsConf.GetCertificate = nil
+		tlsConf.Certificates = []tls.Certificate{cert}
+	}
+
+	// Redirect 80 to 443
+	go func() {
+		err := http.ListenAndServe(net.JoinHostPort(conf.ServeIP, "80"),
+			certManager.HTTPHandler(http.HandlerFunc(redirectToHTTPS)))
+		log.Fatal().Err(err).
+			Str("IP", conf.ServeIP).
+			Msg("Listen HTTP service")
+	}()
+
+	ln, err := tls.Listen("tcp", net.JoinHostPort(conf.ServeIP, "443"), tlsConf)
+	log.InfoFatal(err).
+		Str("IP", conf.ServeIP).
+		Msg("Start listen HTTPS service")
+
+	if si, err := os.Stat(conf.FakeSite); err == nil && si.IsDir() {
+		http.NewFileTransport(http.Dir(conf.FakeSite))
+	} else if _, _, err := net.SplitHostPort(conf.FakeSite); err == nil {
+		go serve443(ln, conf.FakeSite, sower.New(conf.Password), trojan.New(conf.Password))
+	}
+
+	select {}
+}
+
+func redirectToHTTPS(w http.ResponseWriter, r *http.Request) {
+	r.URL.Scheme = "https"
+	if host, _, err := net.SplitHostPort(r.Host); err != nil {
+		r.URL.Host = r.Host
+	} else {
+		r.URL.Host = host
+	}
+
+	http.Redirect(w, r, r.URL.String(), 301)
+}
+
+func serve443(ln net.Listener, fakeSite string, sower *sower.Sower, trojan *trojan.Trojan) {
+	conn, err := ln.Accept()
+	if err != nil {
+		log.Fatal().Err(err).Msg("serve 443 port")
+	}
+	go serve443(ln, fakeSite, sower, trojan)
+	teeconn := teeconn.New(conn)
+	defer teeconn.Close()
+
+	var addr net.Addr
+	var dur time.Duration
+	defer func() {
+		deferlog.DebugWarn(err).
+			Dur("spend", dur).
+			Msgf("relay conn to %s", addr)
+	}()
+
+	// 1. detect if it's a sower underlaying connection
+	teeconn.Reread()
+	if addr, err = sower.Unwrap(teeconn); err == nil {
+		teeconn.Stop()
+
+		dur, err = relay.RelayTo(teeconn, addr.String())
+		return
+	}
+
+	// 2. detect if it's a trojan underlaying connection
+	teeconn.Reread()
+	if addr, err = trojan.Unwrap(teeconn); err == nil {
+		teeconn.Stop()
+
+		dur, err = relay.RelayTo(teeconn, addr.String())
+		return
+	}
+
+	// 3. fallback to fake site
+	teeconn.Stop().Reread()
+	dur, err = relay.RelayTo(teeconn, fakeSite)
+}

conf/conf.go

@@ -1,108 +0,0 @@
-package conf
-
-import (
-	"context"
-	"flag"
-	"net"
-	"os/exec"
-	"path/filepath"
-	"strconv"
-	"time"
-
-	"github.com/BurntSushi/toml"
-	"github.com/golang/glog"
-	"github.com/wweir/fsnotify"
-)
-
-var Conf = struct {
-	ConfigFile string
-	NetType    string `toml:"net_type"`
-	Password   string `toml:"password"`
-
-	ServerPort string `toml:"server_port"`
-	ServerAddr string `toml:"server_addr"`
-
-	DnsServer     string `toml:"dns_server"`
-	ClientIP      string `toml:"client_ip"`
-	ClientIPNet   net.IP `toml:"-"`
-	ClearDnsCache string `toml:"clear_dns_cache"`
-
-	BlockList   []string `toml:"blocklist"`
-	Suggestions []string `toml:"suggestions"`
-	Verbose     int      `toml:"verbose"`
-}{}
-
-func init() {
-	flag.StringVar(&Conf.ConfigFile, "f", "", "config file location")
-	flag.StringVar(&Conf.NetType, "n", "QUIC", "proxy net type (QUIC|KCP|TCP)")
-	flag.StringVar(&Conf.Password, "p", "12345678", "password")
-	flag.StringVar(&Conf.ServerPort, "P", "5533", "server mode listen port")
-	flag.StringVar(&Conf.ServerAddr, "s", "", "server IP (run in client mode if set)")
-	flag.StringVar(&Conf.DnsServer, "d", "114.114.114.114", "client dns server")
-	flag.StringVar(&Conf.ClientIP, "c", "127.0.0.1", "client dns service redirect IP")
-
-	if !flag.Parsed() {
-		flag.Parse()
-	}
-
-	if Conf.ConfigFile == "" {
-		return
-	}
-	if err := OnRefreash[0](); err != nil {
-		panic(err)
-	}
-	watchConfigFile()
-}
-
-var OnRefreash = []func() error{func() error {
-	if _, err := toml.DecodeFile(Conf.ConfigFile, &Conf); err != nil {
-		return err
-	}
-	Conf.ClientIPNet = net.ParseIP(Conf.ClientIP)
-
-	// clear dns cache
-	if Conf.ClearDnsCache != "" {
-		ctx, _ := context.WithTimeout(context.TODO(), 5*time.Second)
-		if err := exec.CommandContext(ctx, "sh", "-c", Conf.ClearDnsCache).Run(); err != nil {
-			glog.Errorln(err)
-		}
-	}
-
-	// for glog
-	if err := flag.Set("v", strconv.Itoa(Conf.Verbose)); err != nil {
-		return err
-	}
-	return nil
-}}
-
-func watchConfigFile() {
-	watcher, err := fsnotify.NewWatcher()
-	if err != nil {
-		glog.Fatalln(err)
-	}
-	if err := watcher.Add(filepath.Dir(Conf.ConfigFile)); err != nil {
-		glog.Fatalln(err)
-	}
-
-	go func() {
-		for {
-			select {
-			case event := <-watcher.Events:
-				if event.Op == fsnotify.Rename {
-					if err := watcher.Add(Conf.ConfigFile); err != nil {
-						glog.Errorln(err)
-					}
-				}
-
-				glog.Infof("watch %s event: %v", Conf.ConfigFile, event)
-				for i := range OnRefreash {
-					if err := OnRefreash[i](); err != nil {
-						glog.Errorln(err)
-					}
-				}
-			case err := <-watcher.Errors:
-				glog.Fatalln(err)
-			}
-		}
-	}()
-}

conf/sower.toml

@@ -1,83 +0,0 @@
-net_type="KCP"
-password="12345678"
-server_port="5533"
-server_addr="remote-server:5533" # replce it to remote server
-dns_server="114.114.114.114"
-# client_ip="192.168.0.1"
-# clear_dns_cache="sudo killall -HUP mDNSResponder"
-blocklist=[
-    "*.google.com", # google
-    "ocsp.pki.goog",
-    "g.co",
-    "*.goo.gl",
-    "*.googleusercontent.com",
-    "*.googleapis.com",
-    "gmail.com",
-    "*.youtube.com", # youtube
-    "*.ytimg.com",
-    "*.ggpht.com",
-    "*.googlevideo.com",
-    "*.vimeo.com",
-    "*.facebook.com", # facebook
-    "*.xx.fbcdn.net",
-    "connect.facebook.net",
-    "*.twitter.com", # twitter
-    "t.co",
-    "*.twimg.com",
-    "www.linkedin.com",
-    "www.reddit.com", # reddit
-    "www.redditmedia.com",
-    "*.blogspot.com", # blogspot
-    "www.blogger.com",
-    "www.feedburner.com",
-    "img1.blogblog.com",
-    "*.aws.amazon.com", # amazon
-    "m.media-amazon.com",
-    "*.awsstatic.com",
-    "*.s3.amazonaws.com",
-	"*.cloudfront.net", # atlassian
-    "synchrony-cdn.atlassian.com",
-    "avatar-cdn.atlassian.com",
-    "*.medium.com",
-    "accounts-static.cdn.mozilla.net", # firefox
-    "*.services.mozilla.com",
-    "pocket-image-cache.com", # pocket
-    "*.golang.org", # golang
-    "go.googlesource.com",
-    "godoc.org",
-    "gist.github.com", # github
-    "*.k8s.io", # k8s
-    "k8s.gcr.io",
-    "*.wikipedia.org", # wikipeida
-    "*.wikimedia.org",
-    "*.wikisource.org",
-    "lookup-api.apple.com",
-    "lookup-api.apple.com.edgekey.net",
-    "e16991.b.akamaiedge.net",
-    "*.web.telegram.org", # telegram
-    "core.telegram.org",
-    "telegram.org",
-    "telegram.me",
-    "t.me",
-    "*.slack.com", #slack
-    "*.slack-edge.com",
-    "js.driftt.com",
-    "cloud.feedly.com", # feedly
-    "static.grammarly.com", # grammarly
-    "apkpure.com", # apkpure
-    "download.apkpure.com",
-    "*.nytimes.com", # New York times
-    "*.nyt.com",
-    "bandwagonhost.com", # bandwagonhost
-    "www.bwh1.net",
-    "*.akadns.net", # suggestions
-    "*.haxx.se",
-    "shadowsocks.org",
-    "t66y.com",
-    "ocsp.godaddy.com",
-    "*.qualtrics.com",
-    "*.starfieldtech.com",
-    "*.typekit.net",
-    "www.v2ray.com",
-]
-verbose=0

dns/dns.go

@@ -1,111 +0,0 @@
-package dns
-
-import (
-	"net"
-	"strings"
-	"time"
-
-	"github.com/golang/glog"
-	"github.com/miekg/dns"
-	"github.com/wweir/sower/conf"
-)
-
-const colon = byte(':')
-
-func StartDNS(dnsServer string) {
-	dns.HandleFunc(".", func(w dns.ResponseWriter, r *dns.Msg) {
-		// *Msg r has an TSIG record and it was validated
-		if r.IsTsig() != nil && w.TsigStatus() == nil {
-			r.SetTsig(r.Extra[len(r.Extra)-1].(*dns.TSIG).Hdr.Name, dns.HmacMD5, 300, time.Now().Unix())
-		}
-
-		//https://stackoverflow.com/questions/4082081/requesting-a-and-aaaa-records-in-single-dns-query/4083071#4083071
-		if len(r.Question) == 0 {
-			return
-		}
-
-		domain := r.Question[0].Name
-		if idx := strings.IndexByte(domain, colon); idx > 0 {
-			domain = domain[:idx]
-		}
-
-		if len(conf.Conf.BlockList) == 0 {
-			bestTry(w, r, domain, dnsServer)
-		} else {
-			manual(w, r, domain, dnsServer)
-		}
-	})
-
-	server := &dns.Server{Addr: ":53", Net: "udp"}
-	glog.Fatalln(server.ListenAndServe())
-}
-
-func bestTry(w dns.ResponseWriter, r *dns.Msg, domain, dnsServer string) {
-	msg, _ := dns.Exchange(r, dnsServer+":53")
-	if msg == nil {
-		return
-	}
-	if len(msg.Answer) == 0 { // expose any response
-		w.WriteMsg(msg)
-		return
-	}
-
-	var ip string
-	switch msg.Answer[0].(type) {
-	case *dns.A:
-		ip = msg.Answer[0].(*dns.A).A.String()
-	case *dns.AAAA:
-		ip = "[" + msg.Answer[0].(*dns.AAAA).AAAA.String() + "]"
-	default:
-		w.WriteMsg(msg)
-		return
-	}
-
-	if _, err := net.DialTimeout("tcp", ip+":http", time.Second); err != nil {
-		glog.V(2).Infoln(ip+":80", err)
-		w.WriteMsg(localA(r, domain))
-		return
-	}
-	w.WriteMsg(msg)
-}
-
-func manual(w dns.ResponseWriter, r *dns.Msg, domain, dnsServer string) {
-	if rule.Match(strings.TrimSuffix(domain, ".")) {
-		glog.V(2).Infof("match %s suss", domain)
-		w.WriteMsg(localA(r, domain))
-		return
-	}
-
-	msg, err := dns.Exchange(r, dnsServer+":53")
-	if msg == nil { // expose any response except nil
-		glog.V(1).Infof("get dns of %s fail: %s", domain, err)
-		return
-	}
-	w.WriteMsg(msg)
-
-	if conf.Conf.Verbose != 0 && len(msg.Answer) != 0 {
-		go func() {
-			_, err := net.DialTimeout("tcp", domain+":http", 2*time.Second)
-			if err == nil || !strings.Contains(err.Error(), "timeout") {
-				return
-			}
-
-			_, err = net.DialTimeout("tcp", domain+":https", 3*time.Second)
-			if err == nil || !strings.Contains(err.Error(), "timeout") {
-				return
-			}
-
-			glog.V(1).Infof("SUGGEST check (%s) http(s) service: %s", domain, err)
-		}()
-	}
-}
-
-func localA(r *dns.Msg, domain string) *dns.Msg {
-	m := new(dns.Msg)
-	m.SetReply(r)
-	m.Answer = []dns.RR{&dns.A{
-		Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 20},
-		A:   conf.Conf.ClientIPNet,
-	}}
-	return m
-}

dns/suffixTree.go

@@ -1,73 +0,0 @@
-package dns
-
-import (
-	"strings"
-)
-
-type Node struct {
-	Node map[string]*Node
-}
-
-func NewNode() *Node {
-	return &Node{Node: map[string]*Node{}}
-}
-func NewNodeFromRule(rules ...string) *Node {
-	node := NewNode()
-	for i := range rules {
-		node.Add(strings.Split(rules[i], "."))
-	}
-	return node
-}
-
-func (n *Node) String() string {
-	return n.string("")
-}
-func (n *Node) string(prefix string) (out string) {
-	for key, val := range n.Node {
-		out += prefix + key + "\n" + val.string(prefix+"    ")
-	}
-	return
-}
-
-func (n *Node) Add(secs []string) {
-	length := len(secs)
-	switch length {
-	case 0:
-		return
-	case 1:
-		n.Node[secs[length-1]] = NewNode()
-	default:
-		subNode, ok := n.Node[secs[length-1]]
-		if !ok {
-			subNode = NewNode()
-			n.Node[secs[length-1]] = subNode
-		}
-		subNode.Add(secs[:length-1])
-	}
-}
-
-func (n *Node) Match(addr string) bool {
-	return n.matchSecs(strings.Split(addr, "."))
-}
-
-func (n *Node) matchSecs(secs []string) bool {
-	length := len(secs)
-	if length == 0 {
-		switch len(n.Node) {
-		case 0:
-			return true
-		case 1:
-			_, ok := n.Node["*"]
-			return ok
-		default:
-			return false
-		}
-	}
-
-	if n, ok := n.Node[secs[length-1]]; ok {
-		return n.matchSecs(secs[:length-1])
-	}
-
-	_, ok := n.Node["*"]
-	return ok
-}

dns/util.go

@@ -1,19 +0,0 @@
-package dns
-
-import (
-	"github.com/golang/glog"
-	"github.com/wweir/sower/conf"
-)
-
-var rule *Node
-
-func init() {
-	rule = NewNodeFromRule(conf.Conf.BlockList...)
-	glog.V(2).Infof("block rule:\n%s", rule)
-
-	conf.OnRefreash = append(conf.OnRefreash, func() error {
-		rule = NewNodeFromRule(conf.Conf.BlockList...)
-		glog.V(2).Infof("block rule:\n%s", rule)
-		return nil
-	})
-}

go.mod

@@ -1,28 +1,37 @@
 module github.com/wweir/sower
 
+go 1.22
+
+toolchain go1.22.3
+
 require (
-	github.com/BurntSushi/toml v0.3.1
-	github.com/bifurcation/mint v0.0.0-20181105071958-a14404e9a861 // indirect
-	github.com/cheekybits/genny v1.0.0 // indirect
-	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
-	github.com/golang/mock v1.1.1 // indirect
-	github.com/hashicorp/golang-lru v0.5.0 // indirect
-	github.com/klauspost/cpuid v1.2.0 // indirect
-	github.com/klauspost/reedsolomon v1.7.0 // indirect
-	github.com/lucas-clemente/aes12 v0.0.0-20171027163421-cd47fb39b79f // indirect
-	github.com/lucas-clemente/quic-go v0.10.0
-	github.com/lucas-clemente/quic-go-certificates v0.0.0-20160823095156-d2f86524cced // indirect
-	github.com/miekg/dns v1.1.1
-	github.com/onsi/ginkgo v1.7.0 // indirect
-	github.com/onsi/gomega v1.4.3 // indirect
-	github.com/pkg/errors v0.8.0
-	github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 // indirect
-	github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b // indirect
-	github.com/tjfoc/gmsm v1.0.1 // indirect
-	github.com/wweir/fsnotify v1.4.8
-	github.com/xtaci/kcp-go v4.3.2+incompatible
-	golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9 // indirect
-	golang.org/x/net v0.0.0-20181201002055-351d144fa1fc // indirect
-	golang.org/x/sync v0.0.0-20181108010431-42b317875d0f // indirect
-	golang.org/x/sys v0.0.0-20181128092732-4ed8d59d0b35 // indirect
+	github.com/cristalhq/aconfig v0.18.5
+	github.com/cristalhq/aconfig/aconfighcl v0.17.1
+	github.com/cristalhq/aconfig/aconfigtoml v0.17.1
+	github.com/cristalhq/aconfig/aconfigyaml v0.17.1
+	github.com/krolaw/dhcp4 v0.0.0-20190909130307-a50d88189771
+	github.com/libp2p/go-reuseport v0.4.0
+	github.com/miekg/dns v1.1.59
+	github.com/oschwald/geoip2-golang v1.9.0
+	github.com/pkg/errors v0.9.1
+	github.com/sower-proxy/conns v0.0.3
+	github.com/sower-proxy/deferlog v1.0.7
+	github.com/sower-proxy/mem v0.0.3
+	golang.org/x/crypto v0.23.0
+)
+
+require (
+	github.com/BurntSushi/toml v1.3.2 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/oschwald/maxminddb-golang v1.12.0 // indirect
+	github.com/rs/zerolog v1.32.0 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	golang.org/x/tools v0.21.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,68 +1,70 @@
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/bifurcation/mint v0.0.0-20181105071958-a14404e9a861 h1:x17NvoJaphEzay72TFej4OSSsgu3xRYBLkbIwdofS/4=
-github.com/bifurcation/mint v0.0.0-20181105071958-a14404e9a861/go.mod h1:zVt7zX3K/aDCk9Tj+VM7YymsX66ERvzCJzw8rFCX2JU=
-github.com/cheekybits/genny v1.0.0 h1:uGGa4nei+j20rOSeDeP5Of12XVm7TGUd4dJA9RDitfE=
-github.com/cheekybits/genny v1.0.0/go.mod h1:+tQajlRqAUrPI7DOSpB0XAqZYtQakVtB7wXkRAgjxjQ=
-github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/mock v1.1.1 h1:G5FRp8JnTd7RQH5kemVNlMeyXQAztQ3mOWV95KxsXH8=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/hashicorp/golang-lru v0.5.0 h1:CL2msUPvZTLb5O648aiLNJw3hnBxN2+1Jq8rCOH9wdo=
-github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
-github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
-github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
-github.com/klauspost/cpuid v1.2.0 h1:NMpwD2G9JSFOE1/TJjGSo5zG7Yb2bTe7eq1jH+irmeE=
-github.com/klauspost/cpuid v1.2.0/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
-github.com/klauspost/reedsolomon v1.7.0 h1:pLFmRKGko2ZieiTGyo9DahLCIuljyxm+Zzhz/fYEonE=
-github.com/klauspost/reedsolomon v1.7.0/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
-github.com/lucas-clemente/aes12 v0.0.0-20171027163421-cd47fb39b79f h1:sSeNEkJrs+0F9TUau0CgWTTNEwF23HST3Eq0A+QIx+A=
-github.com/lucas-clemente/aes12 v0.0.0-20171027163421-cd47fb39b79f/go.mod h1:JpH9J1c9oX6otFSgdUHwUBUizmKlrMjxWnIAjff4m04=
-github.com/lucas-clemente/quic-go v0.10.0 h1:xEF+pSHYAOcu+U10Meunf+DTtc8vhQDRqlA0BJ6hufc=
-github.com/lucas-clemente/quic-go v0.10.0/go.mod h1:wuD+2XqEx8G9jtwx5ou2BEYBsE+whgQmlj0Vz/77PrY=
-github.com/lucas-clemente/quic-go-certificates v0.0.0-20160823095156-d2f86524cced h1:zqEC1GJZFbGZA0tRyNZqRjep92K5fujFtFsu5ZW7Aug=
-github.com/lucas-clemente/quic-go-certificates v0.0.0-20160823095156-d2f86524cced/go.mod h1:NCcRLrOTZbzhZvixZLlERbJtDtYsmMw8Jc4vS8Z0g58=
-github.com/miekg/dns v1.1.1 h1:DVkblRdiScEnEr0LR9nTnEQqHYycjkXW9bOjd+2EL2o=
-github.com/miekg/dns v1.1.1/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
-github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
-github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
-github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
-github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
-github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 h1:89CEmDvlq/F7SJEOqkIdNDGJXrQIhuIx9D2DBXjavSU=
-github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161/go.mod h1:wM7WEvslTq+iOEAMDLSzhVuOt5BRZ05WirO+b09GHQU=
-github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b h1:mnG1fcsIB1d/3vbkBak2MM0u+vhGhlQwpeimUi7QncM=
-github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b/go.mod h1:5XA7W9S6mni3h5uvOC75dA3m9CCCaS83lltmc0ukdi4=
-github.com/tjfoc/gmsm v1.0.1 h1:R11HlqhXkDospckjZEihx9SW/2VW0RgdwrykyWMFOQU=
-github.com/tjfoc/gmsm v1.0.1/go.mod h1:XxO4hdhhrzAd+G4CjDqaOkd0hUzmtPR/d3EiBBMn/wc=
-github.com/wweir/fsnotify v1.4.8 h1:zxOoqwE5p91F3rmcYLQheoSeTlIVqwi2b5T7UlpElWE=
-github.com/wweir/fsnotify v1.4.8/go.mod h1:4GuxIc23DXfJI1/LhBXG5eE/wJ4CzL+kk5M7woxVprc=
-github.com/xtaci/kcp-go v4.3.2+incompatible h1:vM5gqHI8p5xa3eXQH279+16fG86gCz/IRamaQvWG+a8=
-github.com/xtaci/kcp-go v4.3.2+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9 h1:mKdxBk7AujPs8kU4m80U72y/zjbZ3UcXC7dClwKbUI0=
-golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20181201002055-351d144fa1fc h1:a3CU5tJYVj92DY2LaA1kUkrsqD5/3mLDhx2NcNqyW+0=
-golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ=
-golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20181128092732-4ed8d59d0b35 h1:YAFjXN64LMvktoUZH9zgY4lGc/msGN7HQfoSuKCgaDU=
-golang.org/x/sys v0.0.0-20181128092732-4ed8d59d0b35/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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+golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
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+golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
+golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
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-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -1,20 +0,0 @@
-package main
-
-import (
-	"github.com/golang/glog"
-	"github.com/wweir/sower/conf"
-	"github.com/wweir/sower/dns"
-	"github.com/wweir/sower/proxy"
-)
-
-func main() {
-	conf := conf.Conf
-	glog.Infoln("Starting:", conf)
-
-	if conf.ServerAddr == "" {
-		proxy.StartServer(conf.NetType, conf.ServerPort, conf.Password)
-	} else {
-		go dns.StartDNS(conf.DnsServer)
-		proxy.StartClient(conf.NetType, conf.ServerAddr, conf.Password)
-	}
-}

parse/addr.go

@@ -1,46 +0,0 @@
-package parse
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"net"
-	"net/http"
-	"strings"
-)
-
-func ParseAddr(conn net.Conn) (teeConn *TeeConn, addr string, err error) {
-	teeConn = &TeeConn{Conn: conn}
-	teeConn.StartOrReset()
-	defer teeConn.Stop()
-
-	buf := make([]byte, 1)
-	if n, err := teeConn.Read(buf); err != nil {
-		return teeConn, "", fmt.Errorf("Read conn fail: %v, readed: %v", err, buf[:n])
-	}
-
-	teeConn.StartOrReset()
-
-	// https
-	if buf[0] == 0x16 { // SSL handleshake
-		host, _, err := extractSNI(io.Reader(teeConn))
-		if err != nil {
-			return teeConn, "", err
-		}
-		if strings.Contains(host, ":") {
-			return teeConn, host, nil
-		}
-		return teeConn, host + ":443", nil
-	}
-
-	// http
-	b := bufio.NewReader(teeConn)
-	resp, err := http.ReadRequest(b)
-	if err != nil {
-		return teeConn, "", err
-	}
-	if strings.Contains(resp.Host, ":") {
-		return teeConn, resp.Host, nil
-	}
-	return teeConn, resp.Host + ":80", nil
-}

parse/sni.go

@@ -1,232 +0,0 @@
-// Copyright 2016 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package parse
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"io"
-)
-
-func extractSNI(r io.Reader) (string, int, error) {
-	handshake, tlsver, err := handshakeRecord(r)
-	if err != nil {
-		return "", 0, fmt.Errorf("reading TLS record: %s", err)
-	}
-
-	sni, err := parseHello(handshake)
-	if err != nil {
-		return "", 0, fmt.Errorf("reading ClientHello: %s", err)
-	}
-	if len(sni) == 0 {
-		// ClientHello did not present an SNI extension. Valid packet,
-		// no hostname.
-		return "", tlsver, nil
-	}
-
-	hostname, err := parseSNI(sni)
-	if err != nil {
-		return "", 0, fmt.Errorf("parsing SNI extension: %s", err)
-	}
-	return hostname, tlsver, nil
-}
-
-// Extract the indicated hostname, if any, from the given SNI
-// extension bytes.
-func parseSNI(b []byte) (string, error) {
-	b, _, err := vector(b, 2)
-	if err != nil {
-		return "", err
-	}
-
-	var ret []byte
-	for len(b) >= 3 {
-		typ := b[0]
-		ret, b, err = vector(b[1:], 2)
-		if err != nil {
-			return "", fmt.Errorf("truncated SNI extension")
-		}
-
-		if typ == sniHostnameID {
-			return string(ret), nil
-		}
-	}
-
-	if len(b) != 0 {
-		return "", fmt.Errorf("trailing garbage at end of SNI extension")
-	}
-
-	// No DNS-based SNI present.
-	return "", nil
-}
-
-const sniExtensionID = 0
-const sniHostnameID = 0
-
-// Parse a TLS handshake record as a ClientHello message and extract
-// the SNI extension bytes, if any.
-func parseHello(b []byte) ([]byte, error) {
-	if len(b) == 0 {
-		return nil, errors.New("zero length handshake record")
-	}
-	if b[0] != 1 {
-		return nil, fmt.Errorf("non-ClientHello handshake record type %d", b[0])
-	}
-
-	// We're expecting a stricter TLS parser to run after we've
-	// proxied, so we ignore any trailing bytes that might be present
-	// (e.g. another handshake message).
-	b, _, err := vector(b[1:], 3)
-	if err != nil {
-		return nil, fmt.Errorf("reading ClientHello: %s", err)
-	}
-
-	// ClientHello must be at least 34 bytes to reach the first vector
-	// length byte. The actual minimal size is larger than that, but
-	// vector() will correctly handle truncated packets.
-	if len(b) < 34 {
-		return nil, errors.New("ClientHello packet too short")
-	}
-
-	if b[0] != 3 {
-		return nil, fmt.Errorf("ClientHello has unsupported version %d.%d", b[0], b[1])
-	}
-	switch b[1] {
-	case 1, 2, 3:
-		// TLS 1.0, TLS 1.1, TLS 1.2
-	default:
-		return nil, fmt.Errorf("TLS record has unsupported version %d.%d", b[0], b[1])
-	}
-
-	// Skip over version and random struct
-	b = b[34:]
-
-	// We don't technically care about SessionID, but we care that the
-	// framing is well-formed all the way up to the SNI field, so that
-	// we are sure that we're pulling the same SNI bytes as the
-	// eventual TLS implementation.
-	vec, b, err := vector(b, 1)
-	if err != nil {
-		return nil, fmt.Errorf("reading ClientHello SessionID: %s", err)
-	}
-	if len(vec) > 32 {
-		return nil, fmt.Errorf("ClientHello SessionID too long (%db)", len(vec))
-	}
-
-	// Likewise, we're just checking the bare minimum of framing.
-	vec, b, err = vector(b, 2)
-	if err != nil {
-		return nil, fmt.Errorf("reading ClientHello CipherSuites: %s", err)
-	}
-	if len(vec) < 2 || len(vec)%2 != 0 {
-		return nil, fmt.Errorf("ClientHello CipherSuites invalid length %d", len(vec))
-	}
-
-	vec, b, err = vector(b, 1)
-	if err != nil {
-		return nil, fmt.Errorf("reading ClientHello CompressionMethods: %s", err)
-	}
-	if len(vec) < 1 {
-		return nil, fmt.Errorf("ClientHello CompressionMethods invalid length %d", len(vec))
-	}
-
-	// Finally, we reach the extensions.
-	if len(b) == 0 {
-		// No extensions. This is not an error, it just means we have
-		// no SNI payload.
-		return nil, nil
-	}
-	b, vec, err = vector(b, 2)
-	if err != nil {
-		return nil, fmt.Errorf("reading ClientHello extensions: %s", err)
-	}
-	if len(vec) != 0 {
-		return nil, fmt.Errorf("%d bytes of trailing garbage in ClientHello", len(vec))
-	}
-
-	for len(b) >= 4 {
-		typ := binary.BigEndian.Uint16(b[:2])
-		vec, b, err = vector(b[2:], 2)
-		if err != nil {
-			return nil, fmt.Errorf("reading ClientHello extension %d: %s", typ, err)
-		}
-		if typ == sniExtensionID {
-			// Found the SNI extension, return its payload. We don't
-			// care about anything in the packet beyond this point.
-			return vec, nil
-		}
-	}
-
-	if len(b) != 0 {
-		return nil, fmt.Errorf("%d bytes of trailing garbage in ClientHello", len(b))
-	}
-
-	// Successfully parsed all extensions, but there was no SNI.
-	return nil, nil
-}
-
-const maxTLSRecordLength = 16384
-
-// Read one TLS record, which must be for the handshake protocol, from r.
-func handshakeRecord(r io.Reader) ([]byte, int, error) {
-	var hdr struct {
-		Type         uint8
-		Major, Minor uint8
-		Length       uint16
-	}
-	if err := binary.Read(r, binary.BigEndian, &hdr); err != nil {
-		return nil, 0, fmt.Errorf("reading TLS record header: %s", err)
-	}
-
-	if hdr.Type != 22 {
-		return nil, 0, fmt.Errorf("TLS record is not a handshake")
-	}
-
-	if hdr.Major != 3 {
-		return nil, 0, fmt.Errorf("TLS record has unsupported version %d.%d", hdr.Major, hdr.Minor)
-	}
-	switch hdr.Minor {
-	case 1, 2, 3:
-		// TLS 1.0, TLS 1.1, TLS 1.2
-	default:
-		return nil, 0, fmt.Errorf("TLS record has unsupported version %d.%d", hdr.Major, hdr.Minor)
-	}
-
-	if hdr.Length > maxTLSRecordLength {
-		return nil, 0, fmt.Errorf("TLS record length is greater than %d", maxTLSRecordLength)
-	}
-
-	ret := make([]byte, hdr.Length)
-	if _, err := io.ReadFull(r, ret); err != nil {
-		return nil, 0, err
-	}
-
-	return ret, int(hdr.Minor), nil
-}
-
-func vector(b []byte, lenBytes int) ([]byte, []byte, error) {
-	if len(b) < lenBytes {
-		return nil, nil, errors.New("not enough space in packet for vector")
-	}
-	var l int
-	for _, b := range b[:lenBytes] {
-		l = (l << 8) + int(b)
-	}
-	if len(b) < l+lenBytes {
-		return nil, nil, errors.New("not enough space in packet for vector")
-	}
-	return b[lenBytes : l+lenBytes], b[l+lenBytes:], nil
-}

parse/tee_conn.go

@@ -1,37 +0,0 @@
-package parse
-
-import (
-	"net"
-)
-
-type TeeConn struct {
-	net.Conn
-	buf    []byte
-	offset int
-	tee    bool // read
-}
-
-func (t *TeeConn) StartOrReset() {
-	t.offset = 0
-	t.tee = true
-}
-func (t *TeeConn) Stop() {
-	t.offset = 0
-	t.tee = false
-}
-
-func (t *TeeConn) Read(b []byte) (n int, err error) {
-	length := len(t.buf) - t.offset
-	if length > 0 {
-		n = copy(b, t.buf[t.offset:])
-		t.offset += n
-		return
-	}
-
-	n, err = t.Conn.Read(b)
-	if t.tee {
-		t.buf = append(t.buf, b[:n]...)
-		t.offset += n
-	}
-	return n, err
-}

pkg/dhcp/dhcp.go

@@ -0,0 +1,64 @@
+package dhcp
+
+import (
+	"math/rand"
+	"net"
+	"runtime"
+	"time"
+
+	"github.com/krolaw/dhcp4"
+	"github.com/libp2p/go-reuseport"
+	"github.com/pkg/errors"
+)
+
+var xid = make([]byte, 4)
+var broadcastAddr, _ = net.ResolveUDPAddr("udp", "255.255.255.255:67")
+
+func GetDNSServer() ([]string, error) {
+	iface, err := PickInternetInterface()
+	if err != nil {
+		return nil, errors.Wrap(err, "pick interface")
+	}
+
+	rand.Read(xid)
+	pack := dhcp4.RequestPacket(dhcp4.Discover, iface.HardwareAddr, net.IPv4(0, 0, 0, 0), xid, true, []dhcp4.Option{
+		{Code: dhcp4.OptionRequestedIPAddress, Value: []byte(iface.IP.To4())},
+		{Code: dhcp4.End},
+	})
+
+	var conn net.PacketConn
+	if runtime.GOOS == "windows" {
+		if conn, err = reuseport.ListenPacket("udp4", iface.IP.String()+":68"); err != nil {
+			return nil, errors.Wrap(err, "listen dhcp")
+		}
+	} else {
+		if conn, err = reuseport.ListenPacket("udp4", "0.0.0.0:68"); err != nil {
+			return nil, errors.Wrap(err, "listen dhcp")
+		}
+	}
+	defer conn.Close()
+	conn.SetDeadline(time.Now().Add(3 * time.Second))
+
+	if _, err := conn.WriteTo([]byte(pack), broadcastAddr); err != nil {
+		return nil, errors.Wrap(err, "write broadcast")
+	}
+
+	buf := make([]byte, 1500 /*MTU*/)
+	n, _, err := conn.ReadFrom(buf)
+	if err != nil {
+		return nil, errors.Wrap(err, "read dhcp offer")
+	}
+
+	pack = dhcp4.Packet(buf[:n])
+	dnsBytes := pack.ParseOptions()[dhcp4.OptionDomainNameServer]
+	if len(dnsBytes) < 4 || len(dnsBytes)%4 != 0 {
+		return nil, errors.New("invalid DNS setting in upstream network device")
+	}
+
+	ips := []string{}
+	for i := 0; i < len(dnsBytes); i += 4 {
+		ips = append(ips, net.IP(dnsBytes[i:i+4]).String())
+	}
+
+	return ips, nil
+}

pkg/dhcp/dhcp_test.go

@@ -0,0 +1,15 @@
+package dhcp_test
+
+import (
+	"fmt"
+
+	"github.com/wweir/sower/pkg/dhcp"
+)
+
+func Example_dns() {
+	got, err := dhcp.GetDNSServer()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(got)
+}

pkg/dhcp/pick_iface_other.go

@@ -0,0 +1,30 @@
+// +build !windows
+
+package dhcp
+
+import (
+	"errors"
+	"net"
+)
+
+// PickInternetInterface pick the first active net interface
+func PickInternetInterface() (*Iface, error) {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+
+	for i := range ifaces {
+		if len(ifaces[i].HardwareAddr) == 0 {
+			continue
+		}
+
+		addrs, _ := ifaces[i].Addrs()
+		for _, addr := range addrs {
+			if ip := addr.(*net.IPNet).IP.To4(); ip != nil {
+				return &Iface{ifaces[i].HardwareAddr, ip}, nil
+			}
+		}
+	}
+	return nil, errors.New("no valid interface")
+}

pkg/dhcp/pick_iface_test.go

@@ -0,0 +1,15 @@
+package dhcp_test
+
+import (
+	"fmt"
+
+	"github.com/wweir/sower/pkg/dhcp"
+)
+
+func Example_iface() {
+	got, err := dhcp.PickInternetInterface()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(got)
+}

pkg/dhcp/pick_iface_windows.go

@@ -0,0 +1,51 @@
+// +build windows
+
+package dhcp
+
+import (
+	"bytes"
+	"errors"
+	"net"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// PickInternetInterface pick the first active net interface
+func PickInternetInterface() (*Iface, error) {
+	list, err := getAdapterList()
+	if err != nil {
+		return nil, err
+	}
+	for {
+		if list.DhcpEnabled == 1 && list.LeaseObtained != 0 {
+			ip := bytes.TrimRight(list.IpAddressList.IpAddress.String[:], string([]byte{0}))
+			return &Iface{net.HardwareAddr(list.Address[:list.AddressLength]), net.ParseIP(string(ip))}, nil
+		}
+
+		if list.Next != nil {
+			list = list.Next
+		} else {
+			return nil, errors.New("no valid interface")
+		}
+	}
+}
+
+func getAdapterList() (*syscall.IpAdapterInfo, error) {
+	b := make([]byte, 1000)
+	l := uint32(len(b))
+	a := (*syscall.IpAdapterInfo)(unsafe.Pointer(&b[0]))
+	// TODO(mikio): GetAdaptersInfo returns IP_ADAPTER_INFO that
+	// contains IPv4 address list only. We should use another API
+	// for fetching IPv6 stuff from the kernel.
+	err := syscall.GetAdaptersInfo(a, &l)
+	if err == syscall.ERROR_BUFFER_OVERFLOW {
+		b = make([]byte, l)
+		a = (*syscall.IpAdapterInfo)(unsafe.Pointer(&b[0]))
+		err = syscall.GetAdaptersInfo(a, &l)
+	}
+	if err != nil {
+		return nil, os.NewSyscallError("GetAdaptersInfo", err)
+	}
+	return a, nil
+}

pkg/dhcp/util.go

@@ -0,0 +1,9 @@
+package dhcp
+
+import "net"
+
+// Iface is net interface address info
+type Iface struct {
+	net.HardwareAddr
+	net.IP
+}

pkg/suffixtree/suffix_tree.go

@@ -0,0 +1,143 @@
+package suffixtree
+
+import (
+	"strings"
+)
+
+type Node struct {
+	*node
+	sep   string
+	Count uint64
+}
+type node struct {
+	secs     []string
+	subNodes []*node
+}
+
+func NewNodeFromRules(rules ...string) *Node {
+	n := &Node{&node{}, ".", 0}
+	for i := range rules {
+		n.Add(rules[i])
+	}
+
+	n.GC()
+	return n
+}
+
+func (n *node) GC() {
+	if n == nil {
+		return
+	}
+
+	n.secs = GCSlice(n.secs)
+	n.subNodes = GCSlice(n.subNodes)
+	for i := range n.subNodes {
+		n.subNodes[i].GC()
+	}
+}
+
+func (n *Node) String() string {
+	return n.string("", "     ")
+}
+func (n *node) string(prefix, indent string) (out string) {
+	if n == nil {
+		return
+	}
+	for key, val := range n.subNodes {
+		out += prefix + n.secs[key] + "\n" + val.string(prefix+indent, indent)
+	}
+	return
+}
+
+func (n *Node) trim(item string) string {
+	return strings.TrimSuffix(item, n.sep)
+}
+
+func (n *Node) Add(item string) {
+	n.Count++
+	n.add(strings.Split(n.trim(item), n.sep))
+}
+func (n *node) add(secs []string) {
+	length := len(secs)
+	switch length {
+	case 0:
+	case 1:
+		sec := secs[length-1]
+		switch sec {
+		case "", "*", "**":
+			n.secs = append([]string{sec}, n.secs...)
+			n.subNodes = append([]*node{nil}, n.subNodes...)
+		default:
+			n.secs = append(n.secs, sec)
+			n.subNodes = append(n.subNodes, nil)
+		}
+	default:
+		sec := secs[length-1]
+		if sec == "**" { // ** is only allowed in the last sec
+			sec = "*"
+		}
+
+		idx := n.index(sec)
+		if idx == -1 {
+			switch sec {
+			case "", "*", "**":
+				idx = 0
+				n.secs = append([]string{sec}, n.secs...)
+				n.subNodes = append([]*node{{}}, n.subNodes...)
+			default:
+				idx = len(n.secs)
+				n.secs = append(n.secs, sec)
+				n.subNodes = append(n.subNodes, &node{})
+			}
+
+		} else if n.subNodes[idx] == nil {
+			n.subNodes[idx] = &node{}
+			n.subNodes[idx].add([]string{""})
+		}
+
+		n.subNodes[idx].add(secs[:length-1])
+	}
+}
+
+func (n *Node) Match(item string) bool {
+	if n == nil {
+		return false
+	}
+
+	return n.matchSecs(strings.Split(n.trim(item), n.sep), false)
+}
+
+func (n *node) matchSecs(secs []string, fuzzNode bool) bool {
+	length := len(secs)
+	if length == 0 {
+		if n == nil {
+			return true
+		}
+		return n.index("") != -1 || n.index("**") != -1
+	}
+
+	if idx := n.index(secs[length-1]); idx >= 0 {
+		if n.subNodes[idx].matchSecs(secs[:length-1], false) {
+			return true
+		}
+	}
+	if idx := n.index("*"); idx >= 0 {
+		if n.subNodes[idx].matchSecs(secs[:length-1], true) {
+			return true
+		}
+	}
+	return n.index("**") >= 0
+}
+
+// index return the sec index in node, or -1 if not found
+func (n *node) index(sec string) int {
+	if n == nil {
+		return -1
+	}
+	for s := range n.secs {
+		if n.secs[s] == sec {
+			return s
+		}
+	}
+	return -1
+}

pkg/suffixtree/suffix_tree_test.go

@@ -0,0 +1,87 @@
+package suffixtree_test
+
+import (
+	"testing"
+
+	"github.com/wweir/sower/pkg/suffixtree"
+)
+
+func TestNode_Match(t *testing.T) {
+	type test struct {
+		arg  string
+		want bool
+	}
+	tests := []struct {
+		name  string
+		node  *suffixtree.Node
+		tests []test
+	}{{
+		"simple",
+		suffixtree.NewNodeFromRules("a.wweir.cc", "b.wweir.cc"),
+		[]test{
+			{"a.wweir.cc", true},
+			{"b.wweir.cc", true},
+		},
+	}, {
+		"parent",
+		suffixtree.NewNodeFromRules("wweir.cc", "a.wweir.cc"),
+		[]test{
+			{"wweir.cc", true},
+			{"a.wweir.cc", true},
+			{"b.wweir.cc", false},
+		},
+	}, {
+		"fuzz1",
+		suffixtree.NewNodeFromRules("wweir.cc", "a.wweir.cc", "*.wweir.cc"),
+		[]test{
+			{"wweir.cc", true},
+			{"a.wweir.cc", true},
+			{"b.wweir.cc", true},
+			{"a.b.wweir.cc", false},
+		},
+	}, {
+		"fuzz2",
+		suffixtree.NewNodeFromRules("a.*.cc", "c.wweir.*"),
+		[]test{
+			{"wweir.cc", false},
+			{"a.wweir.cc", true},
+			{"b.wweir.cc", false},
+			{"c.wweir.cc", true},
+		},
+	}, {
+		"fuzz3",
+		suffixtree.NewNodeFromRules("*.*.cc", "iamp.*.*"),
+		[]test{
+			{"wweir.cc", false},
+			{"a.wweir.cc", true},
+			{"b.wweir.cc", true},
+			{"iamp.wweir.cc", true},
+		},
+	}, {
+		"fuzz4",
+		suffixtree.NewNodeFromRules("**.cc", "a.**.com", "**.wweir.*"),
+		[]test{
+			{"wweir.cc", true},
+			{"a.wweir.cc", true},
+			{"a.b.wweir.cc", true},
+			{"a.fuzz.com", true},
+			{"b.fuzz.com", false},
+			{"www.wweir.com", true},
+		},
+	}, {
+		"github",
+		suffixtree.NewNodeFromRules("**.github.com"),
+		[]test{
+			{"github.com", true},
+		},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			for _, test := range tt.tests {
+				if got := tt.node.Match(test.arg); got != test.want {
+					t.Errorf("Node.Match(%s) = %v, want %v", test.arg, got, test.want)
+				}
+			}
+		})
+	}
+}

pkg/suffixtree/util.go

@@ -0,0 +1,6 @@
+package suffixtree
+
+func GCSlice[T any](arr []T) []T {
+	old := arr
+	return append(make([]T, 0, len(old)), old...)
+}

proxy/client.go

@@ -1,72 +0,0 @@
-package proxy
-
-import (
-	"net"
-
-	"github.com/golang/glog"
-	"github.com/wweir/sower/proxy/kcp"
-	"github.com/wweir/sower/proxy/quic"
-	"github.com/wweir/sower/proxy/tcp"
-	"github.com/wweir/sower/shadow"
-)
-
-type Client interface {
-	Dial(server string) (net.Conn, error)
-}
-
-func StartClient(netType, server, password string) {
-	var connCh = listenLocal([]string{":80", ":443"})
-	var client Client
-	switch netType {
-	case QUIC.String():
-		client = quic.NewClient()
-	case KCP.String():
-		client = kcp.NewClient()
-	case TCP.String():
-		client = tcp.NewClient()
-	}
-	glog.Infoln("Client started.")
-
-	for {
-		conn := <-connCh
-		glog.V(1).Infof("new conn from (%s) to (%s)", conn.RemoteAddr(), server)
-
-		rc, err := client.Dial(server)
-		if err != nil {
-			conn.Close()
-			glog.Errorln(err)
-			continue
-		}
-
-		if rc, err = shadow.Shadow(rc, password); err != nil {
-			glog.Fatalln(err)
-		}
-
-		go relay(conn, rc)
-	}
-}
-
-func listenLocal(ports []string) <-chan net.Conn {
-	connCh := make(chan net.Conn, 10)
-	for i := range ports {
-		go func(port string) {
-			ln, err := net.Listen("tcp", port)
-			if err != nil {
-				glog.Fatalln(err)
-			}
-
-			for {
-				conn, err := ln.Accept()
-				if err != nil {
-					glog.Errorln("accept", port, "fail:", err)
-					continue
-				}
-
-				connCh <- conn
-			}
-		}(ports[i])
-	}
-
-	glog.Infoln("listening ports:", ports)
-	return connCh
-}

proxy/kcp/client.go

@@ -1,65 +0,0 @@
-package kcp
-
-import (
-	"net"
-
-	"github.com/pkg/errors"
-	kcp "github.com/xtaci/kcp-go"
-)
-
-type client struct {
-	DataShard    int
-	ParityShard  int
-	DSCP         int
-	SockBuf      int
-	AckNodelay   bool
-	NoDelay      int
-	Interval     int
-	Resend       int
-	NoCongestion int
-	SndWnd       int
-	RcvWnd       int
-	MTU          int
-}
-
-func NewClient() *client {
-	return &client{
-		DataShard:    10,
-		ParityShard:  3,
-		DSCP:         0,
-		SockBuf:      4194304,
-		NoDelay:      0,
-		Interval:     50,
-		Resend:       0,
-		NoCongestion: 0,
-		SndWnd:       0,
-		RcvWnd:       0,
-		MTU:          1350,
-	}
-}
-
-func (c *client) Dial(server string) (net.Conn, error) {
-	conn, err := kcp.DialWithOptions(server, nil, c.DataShard, c.ParityShard)
-	if err != nil {
-		return nil, errors.Wrap(err, "dial")
-	}
-
-	conn.SetStreamMode(true)
-	conn.SetWriteDelay(false)
-	conn.SetNoDelay(c.NoDelay, c.Interval, c.Resend, c.NoCongestion)
-	conn.SetWindowSize(c.SndWnd, c.RcvWnd)
-	conn.SetMtu(c.MTU)
-	conn.SetACKNoDelay(c.AckNodelay)
-
-	if err := conn.SetDSCP(c.DSCP); err != nil {
-		return nil, errors.Wrap(err, "SetDSCP")
-	}
-	if err := conn.SetReadBuffer(c.SockBuf); err != nil {
-		return nil, errors.Wrap(err, "SetReadBuffer")
-	}
-	if err := conn.SetWriteBuffer(c.SockBuf); err != nil {
-		return nil, errors.Wrap(err, "SetWriteBuffer")
-	}
-
-	return conn, nil
-}

proxy/kcp/server.go

@@ -1,56 +0,0 @@
-package kcp
-
-import (
-	"net"
-
-	"github.com/golang/glog"
-	"github.com/pkg/errors"
-	kcp "github.com/xtaci/kcp-go"
-)
-
-type server struct {
-	DataShard   int
-	ParityShard int
-	DSCP        int
-	SockBuf     int
-}
-
-func NewServer(password string) *server {
-	return &server{
-		DataShard:   10,
-		ParityShard: 3,
-		DSCP:        0,
-		SockBuf:     4194304,
-	}
-}
-
-func (s *server) Listen(port string) (<-chan net.Conn, error) {
-	ln, err := kcp.ListenWithOptions(port, nil, s.DataShard, s.ParityShard)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := ln.SetDSCP(s.DSCP); err != nil {
-		return nil, errors.Wrap(err, "SetDSCP")
-	}
-	if err := ln.SetReadBuffer(s.SockBuf); err != nil {
-		return nil, errors.Wrap(err, "SetReadBuffer")
-	}
-	if err := ln.SetWriteBuffer(s.SockBuf); err != nil {
-		return nil, errors.Wrap(err, "SetWriteBuffer")
-	}
-
-	connCh := make(chan net.Conn)
-	go func() {
-		for {
-			conn, err := ln.AcceptKCP()
-			if err != nil {
-				glog.Fatalln("KCP listen:", err)
-			}
-
-			connCh <- conn
-		}
-	}()
-
-	return connCh, nil
-}

proxy/nettype_string.go

@@ -1,16 +0,0 @@
-// Code generated by "stringer -type=netType util.go"; DO NOT EDIT.
-
-package proxy
-
-import "strconv"
-
-const _netType_name = "QUICKCPTCP"
-
-var _netType_index = [...]uint8{0, 4, 7, 10}
-
-func (i netType) String() string {
-	if i < 0 || i >= netType(len(_netType_index)-1) {
-		return "netType(" + strconv.FormatInt(int64(i), 10) + ")"
-	}
-	return _netType_name[_netType_index[i]:_netType_index[i+1]]
-}

proxy/quic/client.go

@@ -1,50 +0,0 @@
-package quic
-
-import (
-	"crypto/tls"
-	"net"
-	"time"
-
-	quic "github.com/lucas-clemente/quic-go"
-	"github.com/pkg/errors"
-)
-
-type client struct {
-	conf *quic.Config
-	sess quic.Session
-}
-
-func NewClient() *client {
-	return &client{
-		// conf: &quic.Config{
-		// 	HandshakeTimeout:   5 * time.Second,
-		// 	MaxIncomingStreams: 1024,
-		// 	KeepAlive:          true,
-		// },
-	}
-}
-
-func (c *client) Dial(server string) (net.Conn, error) {
-	if c.sess == nil {
-		if sess, err := quic.DialAddr(server, &tls.Config{InsecureSkipVerify: true}, c.conf); err != nil {
-			return nil, errors.Wrap(err, "session")
-		} else {
-			c.sess = sess
-		}
-	}
-
-	var stream quic.Stream
-	if err := WithTimeout(func() (err error) {
-		if stream, err = c.sess.OpenStream(); err != nil {
-			c.sess = nil
-		}
-		return
-	}, time.Second); err != nil {
-		return nil, errors.Wrap(err, "stream")
-	}
-
-	return &streamConn{
-		Stream: stream,
-		sess:   c.sess,
-	}, nil
-}

proxy/quic/server.go

@@ -1,57 +0,0 @@
-package quic
-
-import (
-	"net"
-
-	"github.com/golang/glog"
-	quic "github.com/lucas-clemente/quic-go"
-	"github.com/pkg/errors"
-)
-
-type server struct {
-	conf *quic.Config
-}
-
-func NewServer() *server {
-	return &server{
-		// conf: &quic.Config{
-		// 	HandshakeTimeout:   5 * time.Second,
-		// 	MaxIncomingStreams: 1024,
-		// 	KeepAlive:          true,
-		// },
-	}
-}
-
-func (s *server) Listen(port string) (<-chan net.Conn, error) {
-	ln, err := quic.ListenAddr(port, mockTlsPem(), s.conf)
-	if err != nil {
-		return nil, errors.WithStack(err)
-	}
-
-	connCh := make(chan net.Conn)
-	go func() {
-		for {
-			sess, err := ln.Accept()
-			if err != nil {
-				glog.Fatalln(err)
-			}
-			go accept(sess, connCh)
-		}
-	}()
-	return connCh, nil
-}
-
-func accept(sess quic.Session, connCh chan<- net.Conn) {
-	glog.V(1).Infoln("new session from ", sess.RemoteAddr())
-	defer sess.Close()
-
-	for {
-		stream, err := sess.AcceptStream()
-		if err != nil {
-			glog.Errorln(err)
-			return
-		}
-
-		connCh <- &streamConn{stream, sess}
-	}
-}

proxy/quic/util.go

@@ -1,67 +0,0 @@
-package quic
-
-import (
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/pem"
-	"math/big"
-	"net"
-	"time"
-
-	"github.com/golang/glog"
-	quic "github.com/lucas-clemente/quic-go"
-	"github.com/pkg/errors"
-)
-
-type streamConn struct {
-	quic.Stream
-	sess quic.Session
-}
-
-func (s *streamConn) LocalAddr() net.Addr {
-	return s.sess.LocalAddr()
-}
-
-func (s *streamConn) RemoteAddr() net.Addr {
-	return s.sess.RemoteAddr()
-}
-
-func mockTlsPem() *tls.Config {
-	key, err := rsa.GenerateKey(rand.Reader, 1024)
-	if err != nil {
-		glog.Fatalln(err)
-	}
-	template := x509.Certificate{SerialNumber: big.NewInt(1)}
-	certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &key.PublicKey, key)
-	if err != nil {
-		glog.Fatalln(err)
-	}
-
-	certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
-	keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)})
-
-	tlsCert, err := tls.X509KeyPair(certPEM, keyPEM)
-	if err != nil {
-		glog.Fatalln(err)
-	}
-	return &tls.Config{Certificates: []tls.Certificate{tlsCert}}
-}
-
-func WithTimeout(fn func() error, timeout time.Duration) error {
-	var okCh = make(chan struct{})
-	var err error
-
-	go func() {
-		err = fn()
-		close(okCh)
-	}()
-
-	select {
-	case <-okCh:
-		return err
-	case <-time.After(timeout):
-		return errors.New("timeout: " + timeout.String())
-	}
-}

proxy/server.go

@@ -1,72 +0,0 @@
-package proxy
-
-import (
-	"net"
-	"strings"
-
-	"github.com/golang/glog"
-	"github.com/wweir/sower/parse"
-	"github.com/wweir/sower/proxy/kcp"
-	"github.com/wweir/sower/proxy/quic"
-	"github.com/wweir/sower/proxy/tcp"
-	"github.com/wweir/sower/shadow"
-)
-
-type Server interface {
-	Listen(port string) (<-chan net.Conn, error)
-}
-
-func StartServer(netType, port, password string) {
-	var server Server
-	switch netType {
-	case QUIC.String():
-		server = quic.NewServer()
-	case KCP.String():
-		server = kcp.NewServer(password)
-	case TCP.String():
-		server = tcp.NewServer()
-	}
-
-	if port == "" {
-		glog.Fatalln("port must set")
-	}
-	if !strings.Contains(port, ":") {
-		port = ":" + port
-	}
-	connCh, err := server.Listen(port)
-	if err != nil {
-		glog.Fatalf("listen %v fail: %s", port, err)
-	}
-	glog.Infoln("Server started.")
-
-	for {
-		conn := <-connCh
-		conn, err := shadow.Shadow(conn, password)
-		if err != nil {
-			glog.Fatalln(err)
-		}
-
-		go handle(conn)
-	}
-}
-
-func handle(conn net.Conn) {
-	conn, addr, err := parse.ParseAddr(conn)
-	if err != nil {
-		glog.Warningln(err)
-		return
-	}
-	glog.V(1).Infof("new conn from %s to %s", conn.RemoteAddr(), addr)
-
-	rc, err := net.Dial("tcp", addr)
-	if err != nil {
-		glog.Warningln(err)
-		return
-	}
-
-	if err := rc.(*net.TCPConn).SetKeepAlive(true); err != nil {
-		glog.Warningln(err)
-	}
-
-	relay(rc, conn)
-}

proxy/tcp/client.go

@@ -1,14 +0,0 @@
-package tcp
-
-import "net"
-
-type client struct {
-}
-
-func NewClient() *client {
-	return &client{}
-}
-
-func (c *client) Dial(server string) (net.Conn, error) {
-	return net.Dial("tcp", server)
-}

proxy/tcp/server.go

@@ -1,34 +0,0 @@
-package tcp
-
-import (
-	"net"
-
-	"github.com/golang/glog"
-)
-
-type server struct {
-}
-
-func NewServer() *server {
-	return &server{}
-}
-
-func (s *server) Listen(port string) (<-chan net.Conn, error) {
-	ln, err := net.Listen("tcp", port)
-	if err != nil {
-		return nil, err
-	}
-
-	connCh := make(chan net.Conn)
-	go func() {
-		for {
-			conn, err := ln.Accept()
-			if err != nil {
-				glog.Fatalln("TCP listen:", err)
-			}
-
-			connCh <- conn
-		}
-	}()
-	return connCh, nil
-}

proxy/util.go

@@ -1,46 +0,0 @@
-package proxy
-
-import (
-	"io"
-	"net"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/golang/glog"
-)
-
-//go:generate stringer -type=netType $GOFILE
-type netType int
-
-const (
-	QUIC netType = iota
-	KCP
-	TCP
-)
-
-func relay(conn1, conn2 net.Conn) {
-	wg := &sync.WaitGroup{}
-	exitFlag := new(int32)
-	wg.Add(2)
-	go redirect(conn2, conn1, wg, exitFlag)
-	redirect(conn1, conn2, wg, exitFlag)
-	wg.Wait()
-}
-
-func redirect(dst, src net.Conn, wg *sync.WaitGroup, exitFlag *int32) {
-	if _, err := io.Copy(dst, src); err != nil {
-		glog.V(1).Infof("%s<>%s -> %s<>%s: %s", src.RemoteAddr(), src.LocalAddr(), dst.LocalAddr(), dst.RemoteAddr(), err)
-	}
-
-	if atomic.CompareAndSwapInt32(exitFlag, 0, 1) {
-		now := time.Now()
-		src.SetReadDeadline(now)
-		dst.SetWriteDeadline(now)
-	} else {
-		src.Close()
-		dst.Close()
-	}
-
-	wg.Done()
-}

router/country.go

@@ -0,0 +1,54 @@
+package router
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/sower-proxy/deferlog/log"
+)
+
+func (r *Router) localSite(domain string) bool {
+	// parse domain to IP
+	ip := net.ParseIP(domain)
+	if ip == nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+		defer cancel()
+
+		ips, err := net.DefaultResolver.LookupIP(ctx, "ip", domain)
+		if err != nil || len(ips) == 0 {
+			log.Warn().Err(err).
+				Str("domain", domain).
+				Int("ips", len(ips)).
+				Msg("resolve domain")
+			return false
+		}
+
+		ip = ips[0]
+	}
+
+	// CIDR match
+	for _, cidr := range r.country.cidrs {
+		if cidr.Contains(ip) {
+			return true
+		}
+	}
+
+	// MMDB match CN
+	if r.country.Reader != nil {
+		city, err := r.country.City(ip)
+		if err != nil {
+			log.Warn().Err(err).
+				Str("domain", domain).
+				IPAddr("ip", ip).
+				Msg("mmdb search")
+			return false
+		}
+
+		if city.Country.IsoCode == "CN" {
+			return true
+		}
+	}
+
+	return false
+}

router/dns.go

@@ -0,0 +1,105 @@
+package router
+
+import (
+	"net"
+
+	"github.com/miekg/dns"
+	"github.com/sower-proxy/deferlog/log"
+	"github.com/wweir/sower/pkg/dhcp"
+)
+
+func (r *Router) ServeDNS(w dns.ResponseWriter, req *dns.Msg) {
+	// https://stackoverflow.com/questions/4082081/requesting-a-and-aaaa-records-in-single-dns-query/4083071#4083071
+	if len(req.Question) == 0 {
+		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeFormatError))
+		return
+	}
+
+	domain := req.Question[0].Name
+	// 1. rule_based( block > direct > proxy )
+	switch {
+	case r.BlockRule.Match(domain):
+		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeNameError))
+		return
+
+	case r.DirectRule.Match(domain):
+
+	case r.ProxyRule.Match(domain):
+		host, _, err := net.SplitHostPort(w.LocalAddr().String())
+		log.DebugWarn(err).Str("host", host).Msg("proxy dns")
+		_ = w.WriteMsg(r.dnsProxyA(domain, net.ParseIP(host), req))
+		return
+	}
+
+	// 2. direct with cache, do not fallback to proxy to avoid side-effect
+	resp, err := r.Exchange(req)
+	if err != nil {
+		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeServerFailure))
+	} else {
+		_ = w.WriteMsg(resp)
+	}
+}
+
+func (r *Router) dnsFail(req *dns.Msg, rcode int) *dns.Msg {
+	m := new(dns.Msg)
+	m.SetRcode(req, rcode)
+	return m
+}
+
+func (r *Router) dnsProxyA(domain string, localIP net.IP, req *dns.Msg) *dns.Msg {
+	m := new(dns.Msg)
+	m.SetReply(req)
+
+	if localIP.To4() != nil {
+		m.Answer = []dns.RR{&dns.A{
+			Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 20},
+			A:   localIP,
+		}}
+
+	} else {
+		m.Answer = []dns.RR{&dns.AAAA{
+			Hdr:  dns.RR_Header{Name: domain, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 20},
+			AAAA: localIP,
+		}}
+	}
+	return m
+}
+
+var upstreamAddrs []string
+var upstreamIndex = -1
+var queryCount = 0
+
+func (r *Router) Exchange(req *dns.Msg) (_ *dns.Msg, err error) {
+	queryCount++
+	if upstreamIndex < 0 {
+		dnsIPs, err := dhcp.GetDNSServer()
+		log.Err(err).
+			Int("queryCount", queryCount).
+			Strs("dns", dnsIPs).
+			Msg("get dns server")
+
+		addrs := make([]string, 0, len(dnsIPs)+1)
+		for _, ip := range dnsIPs {
+			if ip != string(r.dns.serveIP) {
+				addrs = append(addrs, net.JoinHostPort(ip, "53"))
+			}
+		}
+		if len(addrs) == 0 {
+			addrs = append(addrs, net.JoinHostPort(r.dns.fallbackDNS, "53"))
+		}
+
+		queryCount = 0
+		upstreamAddrs = addrs
+		upstreamIndex = len(addrs) - 1
+	}
+
+	resp, err := dns.Exchange(req, upstreamAddrs[upstreamIndex])
+	if err != nil {
+		upstreamIndex--
+		if upstreamIndex >= 0 {
+			resp, err = dns.Exchange(req, upstreamAddrs[upstreamIndex])
+		}
+	}
+
+	return resp, err
+}

router/ping.go

@@ -0,0 +1,51 @@
+package router
+
+import (
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/sower-proxy/deferlog/log"
+	"github.com/sower-proxy/mem"
+)
+
+var accessCache = mem.NewRotateCache(time.Hour, httpPing)
+
+func (r *Router) isAccess(domain string, port uint16) bool {
+	switch port {
+	case 80:
+	case 443:
+	default:
+		return false
+	}
+
+	ok, _ := accessCache.Get(domain)
+	return ok
+}
+
+var pingClient = http.Client{
+	Timeout: 2 * time.Second,
+}
+
+func httpPing(key string) (bool, error) {
+	wg := sync.WaitGroup{}
+	wg.Add(2)
+	var err80, err443 error
+	go func() {
+		_, err80 = pingClient.Head("http://" + key)
+		wg.Done()
+	}()
+	go func() {
+		_, err443 = pingClient.Head("https://" + key)
+		wg.Done()
+	}()
+	wg.Wait()
+
+	if err80 != nil && err443 != nil {
+		log.Warn().
+			Errs("errs", []error{err80, err443}).
+			Msg("Failed to ping")
+	}
+
+	return err80 == nil && err443 == nil, nil
+}

router/router.go

@@ -0,0 +1,109 @@
+package router
+
+import (
+	"net"
+	"strconv"
+	"time"
+
+	"github.com/miekg/dns"
+	geoip2 "github.com/oschwald/geoip2-golang"
+	"github.com/pkg/errors"
+	"github.com/sower-proxy/conns/relay"
+	"github.com/sower-proxy/deferlog"
+	"github.com/sower-proxy/deferlog/log"
+	"github.com/wweir/sower/pkg/suffixtree"
+)
+
+type ProxyDialFn func(network, host string, port uint16) (net.Conn, error)
+type Router struct {
+	BlockRule  *suffixtree.Node
+	DirectRule *suffixtree.Node
+	ProxyRule  *suffixtree.Node
+	ProxyDial  ProxyDialFn
+
+	dns struct {
+		dns.Client
+		fallbackDNS string
+		serveIP     net.IP
+	}
+
+	country struct {
+		*geoip2.Reader
+		cidrs []*net.IPNet
+	}
+}
+
+func NewRouter(serveIP, fallbackDNS, mmdbFile string, proxyDial ProxyDialFn) *Router {
+	r := Router{
+		ProxyDial: proxyDial,
+	}
+
+	r.dns.serveIP = net.ParseIP(serveIP)
+	r.dns.fallbackDNS = fallbackDNS
+
+	var err error
+	r.country.Reader, err = geoip2.Open(mmdbFile)
+	log.InfoWarn(err).Str("file", mmdbFile).Msg("open geoip2 db")
+
+	return &r
+}
+
+func (r *Router) AddCountryCIDRs(cidrs ...string) {
+	for _, cidr := range cidrs {
+		_, ipnet, err := net.ParseCIDR(cidr)
+		if err != nil {
+			log.Error().Err(err).Msg("Failed to parse CIDR")
+		}
+		r.country.cidrs = append(r.country.cidrs, ipnet)
+	}
+	r.country.cidrs = suffixtree.GCSlice(r.country.cidrs)
+}
+
+func (r *Router) RouteHandle(conn net.Conn, domain string, port uint16) (err error) {
+	start := time.Now()
+	defer func() {
+		deferlog.DebugWarn(err).
+			Str("domain", domain).
+			Uint16("port", port).
+			Dur("spend", time.Since(start)).
+			Msg("serve socks5")
+	}()
+
+	addr := net.JoinHostPort(domain, strconv.FormatUint(uint64(port), 10))
+
+	// 1. rule_based( block > direct > proxy )
+	// 2. detect_based( CN IP || access site )
+	// 3. fallback( proxy )
+	switch {
+	case r.BlockRule.Match(domain):
+		return nil
+
+	case r.DirectRule.Match(domain):
+		return r.DirectHandle(conn, addr)
+
+	case r.ProxyRule.Match(domain):
+		return r.ProxyHandle(conn, domain, port)
+
+	case r.localSite(domain), r.isAccess(domain, port):
+		return r.DirectHandle(conn, addr)
+	default:
+		return r.ProxyHandle(conn, domain, port)
+	}
+}
+
+func (r *Router) ProxyHandle(conn net.Conn, domain string, port uint16) error {
+	start := time.Now()
+	rc, err := r.ProxyDial("tcp", domain, port)
+	if err != nil {
+		return errors.Wrapf(err, "proxy dial (%s:%d), spend (%s)", domain, port, time.Since(start))
+	}
+	defer rc.Close()
+
+	_ = relay.Relay(conn, rc)
+	return nil
+}
+
+func (r *Router) DirectHandle(conn net.Conn, addr string) error {
+	dur, err := relay.RelayTo(conn, addr)
+	return errors.Wrapf(err, "spend (%s)", dur)
+}

router/util.go

@@ -0,0 +1,22 @@
+package router
+
+import (
+	"net"
+	"strconv"
+)
+
+func ParseHostPort(hostport string, defaultPort uint16) (string, uint16, error) {
+	host, port, err := net.SplitHostPort(hostport)
+	if err != nil {
+		return "", 0, err
+	}
+	if port == "" {
+		return host, defaultPort, nil
+	}
+
+	portInt, err := strconv.ParseUint(port, 10, 16)
+	if err != nil {
+		return "", 0, err
+	}
+	return host, uint16(portInt), nil
+}

shadow/doc.go

@@ -1,6 +0,0 @@
-// transter conn to be a crypto conn
-// stream mode, blocksize is 1350, for mtu
-// data  [0   ...   1332]
-// block [size][2 ... 1350]
-// payload size + data size + aead overhead => (2+1332+16)
-package shadow

shadow/shadow.go

@@ -1,119 +0,0 @@
-package shadow
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-	"encoding/binary"
-	"io"
-	"math/rand"
-	"net"
-
-	"github.com/pkg/errors"
-)
-
-const MAX_SIZE = 0xFFFF
-
-type conn struct {
-	maxSize      int
-	aead         cipher.AEAD
-	encryptNonce func() []byte
-	decryptNonce func() []byte
-	writeBuf     []byte
-	readBuf      []byte
-	readOffset   int
-	net.Conn
-}
-
-func (c *conn) Read(b []byte) (n int, err error) {
-	// read from buffer
-	if c.readOffset != 0 {
-		dataSize := len(c.readBuf) - c.aead.Overhead()
-		n = copy(b, c.readBuf[c.readOffset:dataSize])
-		c.readOffset += n
-
-		if c.readOffset == dataSize {
-			c.readOffset = 0
-		}
-		return
-	}
-
-	// read from conn
-	dataSize := 0
-	{ //read data size
-		c.readBuf = make([]byte, 2+c.aead.Overhead())
-		if _, err = io.ReadFull(c.Conn, c.readBuf); err != nil {
-			return
-		}
-		if _, err = c.aead.Open(c.readBuf[:0], c.decryptNonce(), c.readBuf, nil); err != nil {
-			return
-		}
-		dataSize = int(c.readBuf[0])<<8 + int(c.readBuf[1])
-	}
-	{ // read data
-		c.readBuf = make([]byte, dataSize+c.aead.Overhead())
-		if _, err = io.ReadFull(c.Conn, c.readBuf); err != nil {
-			return
-		}
-		if _, err = c.aead.Open(c.readBuf[:0], c.decryptNonce(), c.readBuf, nil); err != nil {
-			return
-		}
-	}
-
-	// buffer extra data
-	if n = copy(b, c.readBuf[:dataSize]); n < dataSize {
-		c.readOffset = n
-	}
-	return
-}
-
-func (c *conn) Write(b []byte) (n int, err error) {
-	bLen := len(b)
-	dataSize := MAX_SIZE - (2 + c.aead.Overhead()) - c.aead.Overhead()
-	if bLen < c.maxSize {
-		dataSize = bLen
-	}
-
-	// BigEndian
-	c.writeBuf[0], c.writeBuf[1] = byte((dataSize&0xFF00)>>8), byte(dataSize&0xFF)
-
-	c.aead.Seal(c.writeBuf[:0], c.encryptNonce(), c.writeBuf[:2], nil)
-	c.aead.Seal(c.writeBuf[:2+c.aead.Overhead()], c.encryptNonce(), b[:dataSize], nil)
-
-	_, err = c.Conn.Write(c.writeBuf[:dataSize+(2+c.aead.Overhead())+c.aead.Overhead()])
-	if err != nil {
-		return 0, err
-	}
-	return len(b), err
-}
-
-func Shadow(c net.Conn, password string) (net.Conn, error) {
-	block, err := aes.NewCipher([]byte(password + password)[:16])
-	if err != nil {
-		return nil, errors.Wrap(err, "password too short")
-	}
-
-	aead, err := cipher.NewGCM(block)
-	if err != nil {
-		return nil, errors.Wrap(err, "GCM")
-	}
-
-	return &conn{
-		maxSize:      MAX_SIZE - (2 - aead.Overhead()) - aead.Overhead(),
-		aead:         aead,
-		encryptNonce: newNonce(password, aead.NonceSize()),
-		decryptNonce: newNonce(password, aead.NonceSize()),
-		writeBuf:     make([]byte, 0xFFFF),
-		Conn:         c,
-	}, nil
-}
-
-func newNonce(password string, size int) func() []byte {
-	num, _ := binary.Varint([]byte(password))
-	rnd := rand.New(rand.NewSource(num))
-
-	buf := make([]byte, size)
-	return func() []byte {
-		rnd.Read(buf)
-		return buf
-	}
-}

sower.drawio.svg

@@ -0,0 +1,215 @@
+<svg host="65bd71144e" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="351px" height="491px" viewBox="-0.5 -0.5 351 491" content="&lt;mxfile&gt;&lt;diagram id=&quot;u2y3ysnPqCVZKoHCRF4D&quot; name=&quot;第 1 页&quot;&gt;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&lt;/diagram&gt;&lt;/mxfile&gt;">
+    <defs/>
+    <g>
+        <rect x="0" y="0" width="350" height="490" fill="#ffffff" stroke="#000000" pointer-events="all"/>
+        <path d="M 170 240 L 170 156.37" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 170 151.12 L 173.5 158.12 L 170 156.37 L 166.5 158.12 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 195px; margin-left: 170px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">
+                                HTTPS
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="170" y="198" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">
+                    HTTPS
+                </text>
+            </switch>
+        </g>
+        <path d="M 100 240 L 100 190 L 36.37 190" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 31.12 190 L 38.12 186.5 L 36.37 190 L 38.12 193.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 190px; margin-left: 90px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">
+                                socks5 upstream
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="90" y="193" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">
+                    socks5 upstream
+                </text>
+            </switch>
+        </g>
+        <path d="M 240 240 L 240 190 L 303.63 190" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 308.88 190 L 301.88 193.5 L 303.63 190 L 301.88 186.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 192px; margin-left: 252px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">
+                                direct visit
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="252" y="195" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">
+                    direct visit
+                </text>
+            </switch>
+        </g>
+        <rect x="30" y="240" width="280" height="100" fill="#ffffff" stroke="#000000" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 278px; height: 1px; padding-top: 290px; margin-left: 31px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">
+                                sower
+                                <br/>
+                                <br/>
+                                rules and detect based router
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="170" y="294" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    sower...
+                </text>
+            </switch>
+        </g>
+        <path d="M 170 70 L 170 36.37" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 170 31.12 L 173.5 38.12 L 170 36.37 L 166.5 38.12 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 240 70 L 240 36.37" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 240 31.12 L 243.5 38.12 L 240 36.37 L 236.5 38.12 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <rect x="30" y="70" width="280" height="80" fill="#ffffff" stroke="#000000" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 278px; height: 1px; padding-top: 110px; margin-left: 31px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">
+                                sowerd
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="170" y="114" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    sowerd
+                </text>
+            </switch>
+        </g>
+        <path d="M 255 390 L 255 360 L 170 360 L 170 346.37" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 170 341.12 L 173.5 348.12 L 170 346.37 L 166.5 348.12 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 357px; margin-left: 251px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">
+                                socks5 intelligent proxy
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="251" y="360" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">
+                    socks5 intelligent proxy
+                </text>
+            </switch>
+        </g>
+        <ellipse cx="255" cy="397.5" rx="7.5" ry="7.5" fill="#ffffff" stroke="#000000" pointer-events="all"/>
+        <path d="M 255 405 L 255 430 M 255 410 L 240 410 M 255 410 L 270 410 M 255 430 L 240 450 M 255 430 L 270 450" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 457px; margin-left: 255px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">
+                                Browser  Users
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="255" y="469" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    Brows...
+                </text>
+            </switch>
+        </g>
+        <path d="M 85 390 L 85 360 L 170 360 L 170 346.37" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 170 341.12 L 173.5 348.12 L 170 346.37 L 166.5 348.12 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 360px; margin-left: 91px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">
+                                DNS route the net flow
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="91" y="363" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">
+                    DNS route the net flow
+                </text>
+            </switch>
+        </g>
+        <ellipse cx="85" cy="397.5" rx="7.5" ry="7.5" fill="#ffffff" stroke="#000000" pointer-events="all"/>
+        <path d="M 85 405 L 85 430 M 85 410 L 70 410 M 85 410 L 100 410 M 85 430 L 70 450 M 85 430 L 100 450" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 457px; margin-left: 85px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">
+                                Other Users
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="85" y="469" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    Other...
+                </text>
+            </switch>
+        </g>
+        <rect x="210" y="10" width="60" height="20" fill="none" stroke="none" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 20px; margin-left: 240px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">
+                                fake site
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="240" y="24" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    fake site
+                </text>
+            </switch>
+        </g>
+        <rect x="135" y="10" width="70" height="20" fill="none" stroke="none" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 20px; margin-left: 170px;">
+                        <div style="box-sizing: border-box; font-size: 0; text-align: center; ">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">
+                                target site
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="170" y="24" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    target site
+                </text>
+            </switch>
+        </g>
+    </g>
+    <switch>
+        <g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/>
+        <a transform="translate(0,-5)" xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems" target="_blank">
+            <text text-anchor="middle" font-size="10px" x="50%" y="100%">
+                Viewer does not support full SVG 1.1
+            </text>
+        </a>
+    </switch>
+</svg>

transport/socks5/rfc.go

@@ -0,0 +1,125 @@
+package socks5
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+)
+
+// https://tools.ietf.org/html/rfc1928
+
+// 1. client send auth request
+type authReq struct {
+	VER      byte
+	NMETHODS uint8
+	METHODS  []byte
+}
+
+func (req *authReq) Fulfill(r io.Reader) error {
+	buf := make([]byte, 2)
+	if n, err := r.Read(buf); err != nil || n != 2 {
+		return err
+	}
+
+	req.VER = buf[0]
+	req.NMETHODS = buf[1]
+
+	req.METHODS = make([]byte, int(req.NMETHODS))
+	if n, err := r.Read(req.METHODS); err != nil || n != len(req.METHODS) {
+		return err
+	}
+
+	return nil
+}
+
+func (r *authReq) IsValid() bool {
+	return r.VER == 5 && r.METHODS[0] == 0
+}
+
+// 2. server response auth request
+type authResp struct {
+	VER    byte
+	METHOD byte
+}
+
+// 3. client request with target address
+type reqHead struct {
+	VER  byte
+	CMD  byte
+	RSV  byte
+	ATYP byte
+}
+
+func (r *reqHead) IsValid() bool {
+	return r.VER == 5 && r.CMD == 1
+}
+
+// 4. server response with the address that assigned to connect to target address
+type respHead struct {
+	VER      byte
+	REP      byte
+	RSV      byte
+	ATYP     byte
+	BND_ADDR [net.IPv4len]byte
+	BND_PORT uint16
+}
+
+type addrType interface {
+	Fulfill(r io.Reader) error
+	Addr() (domain string, port uint16)
+}
+
+// ATYP:
+//	0x01 -> net.IPv4len
+//	0x03 -> first byte is length
+//	0x04 -> net.IPv6len
+type addrTypeIPv4 struct {
+	DST_ADDR [4]byte
+	DST_PORT uint16
+}
+
+func (a *addrTypeIPv4) Fulfill(r io.Reader) error {
+	return binary.Read(r, binary.BigEndian, a)
+}
+func (a *addrTypeIPv4) Addr() (string, uint16) {
+	return net.IP(a.DST_ADDR[:]).String(), a.DST_PORT
+}
+
+type addrTypeDomain struct {
+	DST_ADDR_LEN uint8
+	DST_ADDR     []byte
+	DST_PORT     uint16
+}
+
+func (a *addrTypeDomain) Fulfill(r io.Reader) error {
+	buf := make([]byte, 1)
+	if _, err := io.ReadFull(r, buf); err != nil {
+		return err
+	}
+
+	a.DST_ADDR_LEN = uint8(buf[0])
+	buf = make([]byte, a.DST_ADDR_LEN+2)
+	if _, err := io.ReadFull(r, buf); err != nil {
+		return err
+	}
+
+	a.DST_ADDR = buf[:int(a.DST_ADDR_LEN)]
+	a.DST_PORT = binary.BigEndian.Uint16(buf[int(a.DST_ADDR_LEN):])
+
+	return nil
+}
+func (a *addrTypeDomain) Addr() (string, uint16) {
+	return string(a.DST_ADDR[:]), a.DST_PORT
+}
+
+type addrTypeIPv6 struct {
+	DST_ADDR [16]byte
+	DST_PORT uint16
+}
+
+func (a *addrTypeIPv6) Fulfill(r io.Reader) error {
+	return binary.Read(r, binary.BigEndian, a)
+}
+func (a *addrTypeIPv6) Addr() (string, uint16) {
+	return net.IP(a.DST_ADDR[:]).String(), a.DST_PORT
+}

transport/socks5/socks5.go

@@ -0,0 +1,113 @@
+package socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"net"
+	"strconv"
+
+	"github.com/pkg/errors"
+)
+
+type AddrHead struct {
+	addrType
+}
+
+func (h *AddrHead) Network() string { return "tcp" }
+func (h *AddrHead) String() string {
+	host, port := h.Addr()
+	return net.JoinHostPort(host, strconv.Itoa(int(port)))
+}
+
+// Socks5 is a SOCKS5 proxy. It implements the teeconn.Conn interface.
+// It is used to be a second relay of other proxy tools.
+// user -> sower -socks5-> third-party proxy -> target
+type Socks5 struct{}
+
+func New() *Socks5 {
+	return &Socks5{}
+}
+
+var noAuthResp = authResp{VER: 5, METHOD: 0}
+var succHeadResp = respHead{VER: 5, REP: 0, RSV: 0, ATYP: 1}
+
+func (s *Socks5) Unwrap(conn net.Conn) (net.Addr, error) {
+	{ //auth
+		auth := new(authReq)
+		if err := auth.Fulfill(conn); err != nil && !auth.IsValid() {
+			return nil, errors.Errorf("read head: %v, err: %s", auth, err)
+		}
+
+		if err := binary.Write(conn, binary.BigEndian, noAuthResp); err != nil {
+			return nil, errors.Wrap(err, "write auth")
+		}
+	}
+
+	var addr addrType
+	{ // head
+		head := new(reqHead)
+		if err := binary.Read(conn, binary.BigEndian, head); err != nil || !head.IsValid() {
+			return nil, errors.Errorf("read head: %v, err: %s", head, err)
+		}
+		switch head.ATYP {
+		case 0x01: // IPv4
+			addr = &addrTypeIPv4{}
+		case 0x03: // domain name
+			addr = &addrTypeDomain{}
+		case 0x04: // IPv6
+			addr = &addrTypeIPv6{}
+		default:
+			return nil, errors.New("invalid ATYP")
+		}
+
+		if err := addr.Fulfill(conn); err != nil {
+			return nil, errors.Wrap(err, "read target")
+		}
+
+		if err := binary.Write(conn, binary.BigEndian, succHeadResp); err != nil {
+			return nil, errors.Wrap(err, "write head")
+		}
+	}
+
+	return &AddrHead{
+		addrType: addr,
+	}, nil
+}
+
+var noAuthReq = struct {
+	VER      byte
+	NMETHODS uint8
+	METHODS  byte
+}{5, 1, 0}
+var domainHead = reqHead{VER: 5, CMD: 1, RSV: 0, ATYP: 3}
+
+func (s *Socks5) Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error {
+	{ // auth
+		if err := binary.Write(conn, binary.BigEndian, &noAuthReq); err != nil {
+			return errors.WithStack(err)
+		}
+
+		resp := &authResp{}
+		if err := binary.Read(conn, binary.BigEndian, resp); err != nil {
+			return errors.WithStack(err)
+		}
+	}
+	{ // head
+		buf := bytes.NewBuffer(make([]byte, 0, binary.Size(domainHead)+1+len(tgtHost)+2))
+		_ = binary.Write(buf, binary.BigEndian, domainHead)
+		buf.WriteByte(uint8(len(tgtHost)))
+		buf.WriteString(tgtHost)
+		buf.Write([]byte{byte(tgtPort >> 8), byte(tgtPort)})
+
+		if _, err := conn.Write(buf.Bytes()); err != nil {
+			return errors.WithStack(err)
+		}
+
+		head := respHead{}
+		if err := binary.Read(conn, binary.BigEndian, &head); err != nil {
+			return errors.WithStack(err)
+		}
+	}
+
+	return nil
+}

transport/sower/sower.go

@@ -0,0 +1,81 @@
+package sower
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/binary"
+	"net"
+	"strconv"
+
+	"github.com/pkg/errors"
+)
+
+// https://en.wikipedia.org/wiki/Domain_Name_System
+const maxDomainLength = 253
+
+var headSize = binary.Size(new(Head))
+
+// action(>=0x80) + checksum + port + target + data
+// data(HTTP, first byte < 0x7F)
+type Head struct {
+	Cmd      byte
+	Checksum uint64
+	Port     uint16
+	TgtAddr  [maxDomainLength]byte
+}
+
+func (h *Head) Network() string { return "tcp" }
+func (h *Head) String() string {
+	idx := bytes.IndexRune(h.TgtAddr[:], 0)
+	addr := string(h.TgtAddr[:idx])
+	return net.JoinHostPort(addr, strconv.Itoa(int(h.Port)))
+}
+
+type Sower struct {
+	password []byte
+}
+
+func New(password string) *Sower {
+	return &Sower{
+		password: []byte(password),
+	}
+}
+
+func (s *Sower) Unwrap(conn net.Conn) (net.Addr, error) {
+	buf := make([]byte, headSize)
+	if n, err := conn.Read(buf); err != nil || n != headSize {
+		return nil, errors.Errorf("n: %d, err: %s", n, err)
+	}
+
+	h := &Head{}
+	_ = binary.Read(bytes.NewReader(buf), binary.BigEndian, h)
+	switch h.Cmd {
+	case 0x80:
+	default:
+		return nil, errors.Errorf("invalid command: %d", h.Cmd)
+	}
+
+	if h.Checksum != sumChecksum(h.TgtAddr, s.password) {
+		return nil, errors.New("auth fail")
+	}
+
+	return h, nil
+}
+
+func (s *Sower) Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error {
+	tgtAddr := [maxDomainLength]byte{}
+	copy(tgtAddr[:len(tgtHost)], []byte(tgtHost))
+
+	return binary.Write(conn, binary.BigEndian, &Head{
+		Cmd:      0x80,
+		Checksum: sumChecksum(tgtAddr, s.password),
+		Port:     tgtPort,
+		TgtAddr:  tgtAddr,
+	})
+}
+
+func sumChecksum(target [maxDomainLength]byte, password []byte) uint64 {
+	checksum := md5.Sum(append(target[:], password...))
+	checksumVal, _ := binary.Uvarint(checksum[:])
+	return checksumVal
+}

transport/transport.go

@@ -0,0 +1,10 @@
+package transport
+
+import (
+	"net"
+)
+
+type Transport interface {
+	Unwrap(conn net.Conn) (net.Addr, error)
+	Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error
+}

transport/transport_test.go

@@ -0,0 +1,46 @@
+package transport
+
+import (
+	"net"
+	"strings"
+	"testing"
+
+	"github.com/sower-proxy/conns/teeconn"
+	"github.com/sower-proxy/deferlog/log"
+	"github.com/wweir/sower/transport/sower"
+	"github.com/wweir/sower/transport/trojan"
+)
+
+func init() {
+	log.Logger = log.Logger.With().Caller().Logger()
+}
+
+func testPipe(tran Transport) (net.Addr, error) {
+	r, w := net.Pipe()
+	defer r.Close()
+
+	go func(w net.Conn) {
+		defer w.Close()
+		tran.Wrap(w, "sower", 443)
+	}(w)
+
+	return tran.Unwrap(teeconn.New(r))
+}
+
+func Test_Transports(t *testing.T) {
+	if addr, err := testPipe(newSower()); err != nil || strings.TrimSpace(addr.String()) != "sower:443" {
+		t.Errorf("test sower, unexpected address: %s, err: %s", addr, err)
+	}
+
+	if addr, err := testPipe(newTrojan()); err != nil || strings.TrimSpace(addr.String()) != "sower:443" {
+		t.Errorf("test trojan, unexpected address: %s, err: %s", addr, err)
+	}
+}
+
+func newSower() *sower.Sower {
+	return sower.New("123")
+}
+
+func newTrojan() *trojan.Trojan {
+	return trojan.New("123")
+}

transport/trojan/trojan.go

@@ -0,0 +1,174 @@
+package trojan
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/binary"
+	"encoding/hex"
+	"io"
+	"net"
+	"strconv"
+
+	"github.com/pkg/errors"
+)
+
+// +-----------------------+---------+----------------+---------+----------+
+// | hex(SHA224(password)) |  CRLF   | Trojan Request |  CRLF   | Payload  |
+// +-----------------------+---------+----------------+---------+----------+
+// |          56           | X'0D0A' |    Variable    | X'0D0A' | Variable |
+// +-----------------------+---------+----------------+---------+----------+
+// +-----+------+----------+----------+
+// | CMD | ATYP | DST.ADDR | DST.PORT |
+// +-----+------+----------+----------+
+// |  1  |  1   | Variable |    2     |
+// +-----+------+----------+----------+
+// o  CMD
+//         o  CONNECT X'01'
+//         o  UDP ：X'03'
+// o  ATYP
+//         o  IP V4 : X'01'
+//         o  domain: X'03'
+//         o  IP V6 : X'04'
+
+const headLen = 56 + 2 + 1 + 1
+
+type staticHead struct {
+	Passwd [56]byte
+	CRLF   [2]byte
+	CMD    uint8
+	ATYP   uint8
+}
+
+type ipv4Addr struct {
+	ADDR [4]byte
+	PORT uint16
+	CRLF [2]byte
+}
+
+func (*ipv4Addr) Network() string { return "tcp" }
+func (a *ipv4Addr) String() string {
+	return net.JoinHostPort(net.IP(a.ADDR[:]).String(), strconv.Itoa(int(a.PORT)))
+}
+
+type ipv6Addr struct {
+	ADDR [16]byte
+	PORT uint16
+	CRLF [2]byte
+}
+
+func (*ipv6Addr) Network() string { return "tcp" }
+func (a *ipv6Addr) String() string {
+	return net.JoinHostPort(net.IP(a.ADDR[:]).String(), strconv.Itoa(int(a.PORT)))
+}
+
+type domain struct {
+	ADDR string
+	PORT uint16
+	CRLF [2]byte
+}
+
+func (*domain) Network() string { return "tcp" }
+func (a *domain) String() string {
+	return net.JoinHostPort(a.ADDR, strconv.Itoa(int(a.PORT)))
+}
+func (a *domain) Fulfill(r io.Reader) error {
+	buf := make([]byte, 1)
+	if n, err := r.Read(buf); err != nil || n != 1 {
+		return errors.New("read domain length failed")
+	}
+
+	addrLen := int(buf[0])
+	buf = make([]byte, addrLen+4)
+	if n, err := r.Read(buf); err != nil || n != addrLen+4 {
+		return errors.Wrap(err, "read doamin failed")
+	}
+
+	a.ADDR = string(buf[:addrLen])
+	a.PORT = uint16(buf[addrLen])<<8 + uint16(buf[addrLen+1])
+	return nil
+}
+
+type Trojan struct {
+	headPasswd []byte
+
+	headIPv4   []byte
+	headIPv6   []byte
+	headDomain []byte
+}
+
+func New(password string) *Trojan {
+	t := &Trojan{
+		headPasswd: make([]byte, 56),
+	}
+	passSum := sha256.Sum224([]byte(password))
+	hex.Encode(t.headPasswd, passSum[:])
+
+	t.headIPv4 = append(t.headPasswd, 0x0D, 0x0A, 0x01, 0x01)
+	t.headIPv6 = append(t.headPasswd, 0x0D, 0x0A, 0x01, 0x04)
+	t.headDomain = append(t.headPasswd, 0x0D, 0x0A, 0x01, 0x03)
+	return t
+}
+
+func (t *Trojan) Unwrap(conn net.Conn) (net.Addr, error) {
+	buf := make([]byte, headLen)
+	// do not use io.ReadFull to avoid hang
+	if n, err := conn.Read(buf); err != nil || n != headLen {
+		return nil, errors.Errorf("n: %d, err: %s", n, err)
+	}
+
+	head := &staticHead{}
+	if err := binary.Read(bytes.NewBuffer(buf), binary.BigEndian, head); err != nil {
+		return nil, errors.Wrap(err, "read head")
+	}
+
+	if !bytes.Equal(head.Passwd[:], []byte(t.headPasswd)) {
+		return nil, errors.New("auth fail")
+	}
+
+	head.CMD, head.ATYP = buf[58], buf[59]
+	switch head.ATYP {
+	case 0x01: //ipv4
+		addr := &ipv4Addr{}
+		err := binary.Read(conn, binary.BigEndian, addr)
+		return addr, errors.Wrap(err, "read addr")
+
+	case 0x04: //ipv6
+		addr := &ipv6Addr{}
+		err := binary.Read(conn, binary.BigEndian, addr)
+		return addr, errors.Wrap(err, "read addr")
+
+	case 0x03: // domain
+		addr := &domain{}
+		err := addr.Fulfill(conn)
+		return addr, errors.Wrap(err, "read addr")
+
+	default:
+		return nil, errors.New("invalid ATYP")
+	}
+}
+
+func (t *Trojan) Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error {
+	buf := bytes.NewBuffer(make([]byte, 0, headLen+1+len(tgtHost)+4))
+	ip := net.ParseIP(tgtHost)
+	switch {
+	case len(ip.To4()) != 0:
+		buf.Write(t.headIPv4)
+		buf.Write([]byte(ip.To4()))
+
+	case len(ip) != 0:
+		buf.Write(t.headIPv6)
+		buf.Write([]byte(ip.To16()))
+
+	default:
+		buf.Write(t.headDomain)
+		buf.WriteByte(byte(len(tgtHost)))
+		buf.WriteString(tgtHost)
+	}
+
+	buf.Write([]byte{byte(tgtPort >> 8), byte(tgtPort), 0x0D, 0x0A})
+
+	if n, err := conn.Write(buf.Bytes()); err != nil || n != len(buf.Bytes()) {
+		return errors.Errorf("n: %d, err: %s", n, err)
+	}
+	return nil
+}