fix: harden dns proxy routing

chore(deps): bump golang.org/x/crypto from 0.37.0 to 0.45.0

.circleci/config.yml

@@ -1,55 +0,0 @@
-version: 2
-jobs:
-  build:
-    docker:
-      - image: circleci/golang:1.11.4
-    steps:
-      - checkout # check out the code in the project directory
-      - setup_remote_docker # install docker in docker
-      - run:
-          name: Prepare Environment
-          command: |
-            cp conf/sower.toml .
-            cp deploy/* .
-            mkdir artifacts
-      - run:
-          name: Run Unit Test
-          command: |
-            make test
-      - run:
-          name: Build linux Binary
-          command: |
-            make build
-            tar czvf artifacts/sower_linux_amd64.tar.gz sower sower.toml sower-client.service sower-server.service
-      - run:
-          name: Build macOS Binary
-          command: |
-            GOOS=darwin GOARCH=amd64 make build
-            tar czvf artifacts/sower_darwin_amd64.tar.gz sower sower.toml cc.wweir.sower.plist
-      - run:
-          name: Build Windows Binary
-          command: |
-            GOOS=windows GOARCH=amd64 make build
-            tar czvf artifacts/sower_windows_amd64.tar.gz sower sower.toml
-      - run:
-          name: Publish Release on GitHub
-          command: |
-            if git log -1 --pretty='%s' | grep -oE '(^|\s)@release(\s|$)'; then
-              GHR_VERSION="$(curl -s "https://api.github.com/repos/tcnksm/ghr/releases/latest" | awk -F '"'  '/tag_name/{printf $4}')"
-              curl -SLf https://github.com/tcnksm/ghr/releases/download/"$GHR_VERSION"/ghr_"$GHR_VERSION"_linux_amd64.tar.gz | tar xzC /go/bin --strip-components=1
-
-              VERSION=$(git describe --tags)
-              ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${VERSION%-*-*} artifacts/
-            fi
-      - run:
-          name: Build Docker Image
-          command: |
-            if git log -1 --pretty='%s' | grep -oE '(^|\s)@release(\s|$)'; then
-              docker login -u $DOCKER_USER -p $DOCKER_PASS
-              make image
-              VERSION=$(git describe --tags)
-              docker tag sower wweir/sower:${VERSION%-*-*}
-              docker push wweir/sower:${VERSION%-*-*}
-              docker tag sower wweir/sower:latest
-              docker push wweir/sower:latest
-            fi

.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>-c</string>
+			<string>/usr/local/etc/sower/sower.toml</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 -c /etc/sower/sower.toml
+Restart=on-failure
+RestartSec=1min
+
+[Install]
+WantedBy=multi-user.target

.github/sower.toml

@@ -0,0 +1,93 @@
+# Remote upstream connection.
+[remote]
+type = "sower"
+addr = "proxy.example.com"
+password = "your_secure_password"
+# type = "socks5"
+# addr = "127.0.0.1:7890"
+
+[dns]
+disable = false
+# DNS replies for proxied A/AAAA records point clients to this address.
+serve = "127.0.0.1"
+# serve_6 = "::1"
+# serve_iface = "lo"
+fallback = "223.5.5.5"
+
+[socks_5]
+disable = false
+addr = "127.0.0.1:1080"
+
+# Routing priority:
+# block > direct > proxy > geo.
+[router.block]
+file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/adlist/adlist.txt"
+file_skip_rules = [
+  "t.co",
+]
+rules = []
+
+[router.direct]
+file = "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chinalist/chinalist.txt"
+rules = [
+  "imap.*.*",
+  "imap.*.*.*",
+  "smtp.*.*",
+  "smtp.*.*.*",
+  "pop.*.*",
+  "pop.*.*.*",
+  "pop3.*.*",
+  "pop3.*.*.*",
+  "**.cn",
+]
+
+[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",
+  "**.github.com",
+  "**.githubusercontent.com",
+  "**.githubassets.com",
+  "**.githubcopilot.com",
+  "t.co",
+  "lookup-api.apple.com",
+  "**.openai.com",
+  "**.chatgpt.com",
+  "**.oaistatic.com",
+  "**.oaiusercontent.com",
+  "platform.api.openai.org",
+]
+
+[router.country]
+# mmdb is optional. Leave it empty or unset to disable GeoIP lookup and use CIDR rules only.
+# mmdb = "Country.mmdb"
+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 +1,86 @@
+remote:
+  type: "sower"
+  addr: "proxy.example.com"
+  password: "your_secure_password"
+  # type: "socks5"
+  # addr: "127.0.0.1:7890"
+
+dns:
+  disable: false
+  serve: "127.0.0.1"
+  # serve_6: "::1"
+  # serve_iface: "lo"
+  fallback: "223.5.5.5"
+
+socks_5:
+  disable: false
+  addr: "127.0.0.1:1080"
+
+router:
+  block:
+    file: "https://raw.githubusercontent.com/pexcn/daily/gh-pages/adlist/adlist.txt"
+    file_skip_rules:
+      - "t.co"
+    rules: []
+
+  direct:
+    file: "https://raw.githubusercontent.com/pexcn/daily/gh-pages/chinalist/chinalist.txt"
+    rules:
+      - "imap.*.*"
+      - "imap.*.*.*"
+      - "smtp.*.*"
+      - "smtp.*.*.*"
+      - "pop.*.*"
+      - "pop.*.*.*"
+      - "pop3.*.*"
+      - "pop3.*.*.*"
+      - "**.cn"
+
+  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"
+      - "**.github.com"
+      - "**.githubusercontent.com"
+      - "**.githubassets.com"
+      - "**.githubcopilot.com"
+      - "t.co"
+      - "lookup-api.apple.com"
+      - "**.openai.com"
+      - "**.chatgpt.com"
+      - "**.oaistatic.com"
+      - "**.oaiusercontent.com"
+      - "platform.api.openai.org"
+
+  country:
+    # mmdb is optional. Leave it empty or unset to disable GeoIP lookup and use CIDR rules only.
+    # mmdb: "Country.mmdb"
+    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 -c sower.toml",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.toml sower.yaml 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.toml sower.yaml 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.toml sower.yaml 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.toml sower.yaml 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.toml sower.yaml 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.toml sower.yaml 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.toml sower.yaml 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.toml sower.yaml sower_run.vbs
+          make clean
+
+      - uses: ncipollo/release-action@v1
+        with:
+          artifacts: "*.tar.gz"
+          token: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -17,5 +17,17 @@
 *.swo
 .vscode
 .idea
-sower
-/sower.toml
+**.env
+/bin
+
+
+**.mmdb
+/cmd/client/client
+/cmd/server/server
+/sower
+/sowerd
+/*.yml
+/*.yaml
+/*.toml
+/*.hcl
+/*.tf

AGENTS.md

@@ -0,0 +1,136 @@
+## Basic Rules
+
+You are a machine. You do not have emotions. Your goal is not to help me feel good — it’s to help me think better. You think hard to respond exactly to my questions, no fluff, just answers. Do not pretend to be a human. Be critical, honest, and direct. Be ruthless with constructive criticism. Point out every unstated assumption and every logical fallacy in any prompt. Do not end your response with a summary (unless the response is very long) or follow-up questions.
+Use Simplified Chinese to answer my questions.
+
+## Documentation Rules
+
+1. 根目录维护 `ARCHITECTURE.md`，描述整体架构、系统边界、分层职责、关键数据流、设计决策、文档链接
+2. 设计调整前先更新 `ARCHITECTURE.md` 和相关包的 `README.md` 等文档。
+3. 大型方案设计、决策过程及实施进度在 `docs/` 目录下维护文档，有关键进展需更新文档
+
+## Coding Agent Rules
+
+1. 禁止修改 `AGENTS.md`，除非用户在当前任务中明确要求
+2. 需求模糊时先提问澄清，不要猜测
+3. 禁止未授权的重构，避免扩大修改面
+4. 日志和输出中的敏感信息需脱敏
+5. 构建时注入版本和日期信息
+6. 谨慎引入第三方依赖，说明引入原因
+7. 代码变更后使用语言的格式化、lint 工具检查代码质量
+8. 遵循 KISS 原则，优先简单直接的实现；抽象必须服务于复用、测试或隔离复杂度
+9. 代码逻辑中有错误、不合理就指出、改掉，不要轻易加兜底逻辑
+10. 遵循 Let it Crash 原则，优先返回错误而非隐藏、兜底、屏蔽错误
+11. 英文注释，仅注释复杂逻辑、约束和非显然设计决策
+12. git 使用 commitizen 规范，英文提交信息
+13. commit 前先执行 lint format 操作，确保代码质量、风格一致
+14. 代码模块需要有单元测试、集成测试
+
+## Design Preferences
+
+1. 优先用接口定义依赖边界，便于测试和替换
+2. 优先简单直接的实现；抽象必须服务于复用、测试或隔离复杂度
+3. 适当使用泛型减少重复代码，但不为泛型而泛型
+4. 实现优雅关闭：通过 `context` 传播取消信号，并用 `defer` 完成清理
+
+## Code Structure
+
+Go 标准项目结构：
+
+├── api # proto、OpenAPI 文档
+├── cmd # 组件主文件、入口点
+├── config # 配置文件定义、处理、示例
+├── deploy # 部署相关文件
+├── internal # 核心业务逻辑
+├── pkg # 公共组件（业务无关）
+├── web # 前端文件（内嵌到二进制）
+└── tools # 工具脚本
+
+## Code Style
+
+1. 遵循 Go 官方风格（gofmt + goimports）
+2. 使用 `go vet` 和 `go test` 作为基础质量检查；按需补充项目内 lint
+3. 使用 `any` 代替 `interface{}`
+4. 包名使用小写单词，尽量简短
+5. 结构体字段命名遵循 Go 官方约定；仅在序列化或协议需要时添加 `json` 标签
+6. 配置、RPC、HTTP 输入结构体需实现 `Validate` 方法
+7. 无外部依赖的逻辑优先补单元测试
+8. 注释使用英文，只注释复杂逻辑、约束和非显然设计决策
+9. 使用 `github.com/sower-proxy/feconf` 处理配置
+
+## Error Handling
+
+1. 业务代码使用 `slog` 记录日志；工具库和基础组件优先返回 `error`
+2. 关键函数入口使用 `github.com/sower-proxy/deferlog/v2` 记录退出日志，并基于返回值 `err` 自动判断成功或失败
+3. 返回错误时使用 `fmt.Errorf` 包装上下文，保留关键参数和原始错误
+4. 避免同一错误在同一调用链上重复记录；由最合适的边界统一记录
+5. 重试只用于可恢复的关键操作，并显式限制次数、间隔和 `context` 生命周期
+6. 错误上下文必须足以定位问题，但不得泄露敏感信息
+
+## Build and Deployment
+
+1. 使用 Makefile 作为统一构建入口，封装 build、test、package、release 等流程
+2. 构建产物通过 `ldflags` 注入版本和构建日期信息
+3. 部署参数、权限和运行能力默认遵循 `Security Specifications` 中的最小权限原则
+
+## Security Specifications
+
+1. 禁止修改 `AGENTS.md`，除非用户在当前任务中明确要求
+2. 所有网络操作必须设置超时，并优先使用 `context` 控制生命周期
+3. 运行时、部署和凭证访问均遵循最小权限原则
+
+## 代码示例
+
+### 配置加载与验证
+
+使用 feconf 加载和验证配置：
+
+```go
+cfg, err := feconf.New[config.ConfigStruct]("c",
+    "warden.toml", "config/warden.toml", "/etc/warden.toml").Parse()
+if err != nil {
+    log.Fatalln("load config failed", err)
+}
+if err := cfg.Validate(); err != nil {
+    log.Fatalln("validate config failed", err)
+}
+```
+
+### 复杂业务函数的日志记录方式
+
+在关键业务函数中使用 deferlog 自动记录错误日志：
+
+```go
+func (s *Service) ProcessOrder(orderID string) (err error) {
+    defer func() { deferlog.DebugError(err, "ProcessOrder", "order_id", orderID) }()
+
+    order, err := s.repository.GetOrder(orderID)
+    if err != nil {
+        return fmt.Errorf("get order %s: %w", orderID, err)
+    }
+
+    if err := s.validateOrder(order); err != nil {
+        return fmt.Errorf("validate order %s: %w", orderID, err)
+    }
+
+    if err := s.processPayment(order); err != nil {
+        return fmt.Errorf("process payment for order %s: %w", orderID, err)
+    }
+
+    if err := s.shipOrder(order); err != nil {
+        return fmt.Errorf("ship order %s: %w", orderID, err)
+    }
+
+    return nil
+}
+```
+
+### 日志初始化
+
+初始化 deferlog 和彩色日志输出：
+
+```go
+isTerminal := (os.Stdout.Stat().Mode() & os.ModeCharDevice) != 0
+deferlog.SetDefault(slog.New(tint.NewHandler(os.Stdout,
+    &tint.Options{AddSource: true, NoColor: !isTerminal})))
+```

ARCHITECTURE.md

@@ -0,0 +1,123 @@
+# Architecture
+
+## System Boundary
+
+`sower` is the client-side transparent proxy entrypoint. It exposes local DNS, HTTP, HTTPS, and SOCKS5 listeners, applies rule-based routing, and forwards proxied traffic to an upstream transport.
+
+`sowerd` is the server-side TLS ingress. It exposes `80/tcp` and `443/tcp`, terminates TLS, detects the upstream transport protocol, and relays traffic to the requested target or configured fake site.
+
+## Layer Responsibilities
+
+`cmd/sower`
+- Process bootstrap
+- Config loading and validation
+- Local listener lifecycle and graceful shutdown
+- Rule file loading
+- Upstream proxy dialing
+
+`cmd/sowerd`
+- Process bootstrap
+- Interactive self-install mode dispatch
+- Config loading and validation
+- TLS and HTTP server lifecycle
+- Graceful shutdown
+
+`config`
+- Runtime configuration schema
+- Input validation rules
+- Embedded default `sowerd` install config template
+
+`internal/install`
+- Interactive systemd installation flow for `sowerd`
+- Binary copy/update and service file generation
+- Default config and fake site directory bootstrap
+
+`router`
+- Domain and CIDR rule matching
+- Direct/proxy/block routing decisions
+- DNS query handling and upstream selection
+
+`transport/sower`
+- Sower transport frame encode/decode
+
+`transport/trojan`
+- Trojan transport frame encode/decode
+
+`pkg/dhcp`
+- DHCP-based upstream DNS discovery for the client side
+
+## sower Data Flow
+
+1. Load config from flags, env, and files.
+2. Validate remote type, listener addresses, and DNS IP fields.
+3. Log startup metadata with secrets redacted.
+4. Build the upstream proxy dialer with a stable DNS target. If `dns.upstream` is empty, the dialer uses `dns.fallback` to avoid recursive lookup through the local DNS listener.
+5. Build the upstream dialer for the configured remote transport, using standard TLS by default and optional uTLS fingerprints for `sower` and `trojan`.
+6. Build the router with suffix-tree rules and optional country CIDRs.
+   Remote rule files are fetched through the configured upstream proxy dialer, never by direct outbound HTTP, so rule bootstrap uses the same stable egress path as proxied traffic.
+   Remote domain rule files are filtered through per-router `file_skip_rules` before their prefixed entries are appended.
+7. Start enabled local listeners for `udp/53`, `tcp/80`, `tcp/443`, and `tcp/1080` only after rule loading completes.
+8. For DNS requests, return local proxy IPs for proxy-routed domains and query upstream DNS for direct domains.
+   Empty `dns.upstream` keeps router-side DHCP DNS discovery enabled; `dns.fallback` is appended as a backup upstream and is also used while initial discovery is in flight.
+   Proxy-routed domains return local A/AAAA records, suppress HTTPS/SVCB and other non-address metadata locally, and never leak proxy-matched names to direct upstream DNS.
+   Direct upstream DNS failures fall back only for retryable upstream service errors; when no fallback succeeds, the last upstream DNS response code is returned as-is.
+   Service discovery names are matched against both the full query name and the base domain only for service record types.
+9. For HTTP traffic, parse the target host from the request line. For HTTPS transparent traffic, peek the TLS ClientHello to extract SNI. For SOCKS5 traffic, read the SOCKS5 target address. Apply routing rules and either dial directly or wrap traffic in the configured upstream transport.
+   HTTPS transparent proxying reads only the TLS ClientHello, then replays the untouched bytes to the selected upstream; it must not complete or terminate TLS locally.
+10. On shutdown signal, stop listeners and DNS servers through `context` propagation.
+
+## sowerd Data Flow
+
+1. Load config from flags, env, and files.
+2. Validate required fields and address/certificate combinations.
+3. Initialize logger with configured level and redact secrets from startup logs.
+4. Start `:80` HTTP server.
+5. Handle ACME HTTP-01 challenge on `:80`.
+6. Redirect normal HTTP traffic to HTTPS.
+7. If `fakeSite` is a local directory, serve it only for loopback fallback traffic through `127.0.0.1:80`.
+8. Start `:443` TLS listener.
+9. For each accepted connection, apply a short read deadline for protocol probing.
+10. Try `sower` transport first, then `trojan`.
+11. Relay matched traffic to the decoded target.
+12. If no transport matches, relay to `fakeSite`.
+
+## sowerd Install Flow
+
+1. Detect install mode from CLI flags before normal config loading.
+2. Require root privileges because the installer writes to `/usr/local/bin`, `/etc/systemd/system`, and `/etc/sower`.
+3. Optionally copy or update the current binary to `/usr/local/bin/sowerd`.
+4. Write `/etc/systemd/system/sowerd.service` with `ExecStart=/usr/local/bin/sowerd -c /etc/sower/sowerd.toml`.
+5. Ensure `/etc/sower/sowerd.toml` exists and bootstrap `/var/www` for directory-backed fake site mode.
+6. Reload systemd and optionally enable/start or restart the service.
+
+## Design Decisions
+
+- Client and server both fail fast on invalid startup configuration instead of silently degrading.
+- The client loads TOML by default, with YAML kept as an alternate file format; HCL is not supported.
+- Sensitive configuration values must never be printed verbatim in logs.
+- Local listeners use explicit shutdown hooks instead of blocking forever with unmanaged goroutines.
+- Network operations use timeouts and `context` to limit hangs during dialing and remote rule downloads.
+- Upstream TLS behavior is configured only on the client side; `sowerd` remains a normal TLS server and does not need uTLS-specific logic.
+- Rule loading supports local files and remote HTTP sources; remote downloads must use the configured upstream proxy and fail startup if the proxy path cannot fetch them.
+- Domain rule files support per-router skip rules for filtering third-party file entries without removing explicit local rules.
+- Country routing treats `router.country.mmdb` as optional; an empty value disables GeoIP lookup and keeps CIDR-based matching active without startup warnings.
+- Fake site directory mode is loopback-only on port `80` to avoid exposing local static assets directly to the public internet.
+- `sowerd` prefers the user cache directory for ACME state, but falls back to `/var/cache/sower` so systemd services can start without `HOME`/`XDG_CACHE_HOME` or a config file.
+
+## Operational Notes
+
+- `sower` usually needs elevated privileges to bind `53/udp`, `80/tcp`, and `443/tcp`.
+- `sowerd` must bind privileged ports `80` and `443`.
+- `sowerd -i` also requires root because it writes system-level files for self-deployment.
+- ACME mode requires port `80` to be reachable from the public internet.
+- Remote rule download failures stop startup after bounded retries before local listeners are exposed.
+
+## Related Documents
+
+- [README.md](/home/wweir/Mine/sower/README.md)
+- [cmd/sower/main.go](/home/wweir/Mine/sower/cmd/sower/main.go)
+- [cmd/sower/proxy.go](/home/wweir/Mine/sower/cmd/sower/proxy.go)
+- [cmd/sowerd/main.go](/home/wweir/Mine/sower/cmd/sowerd/main.go)
+- [config/sower.go](/home/wweir/Mine/sower/config/sower.go)
+- [config/sowerd.go](/home/wweir/Mine/sower/config/sowerd.go)
+- [internal/install/service.go](/home/wweir/Mine/sower/internal/install/service.go)

CLAUDE.md

@@ -0,0 +1 @@
+AGENTS.md

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

@@ -1,31 +1,25 @@
-SERVER:=127.0.0.1:5533
+MAKEFLAGS += --jobs all
+GO:=CGO_ENABLED=0 go
 
 default: test build
 
-generate:
-	go generate ./...
 test:
-	go test -race ./...
-build:
-	GO111MODULE=on go build -v -ldflags \
-		"-X main.version=$(shell git describe --tags) \
-		 -X main.date=$(shell date +%Y-%m-%d)"
-image:
-	docker build -t sower -f deploy/Dockerfile .
+	${GO} vet ./...
+	${GO} test ./...
 
-kill:
-	sudo pkill -9 sower || true
+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
 
-client: build kill
-	sudo $(PWD)/sower
-
-server: build kill
-	$(PWD)/sower -n TCP -v 1
-
-run: build kill
-	$(PWD)/sower -n TCP -v 1  &
-	sudo $(PWD)/sower &
-	@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

@@ -1,93 +1,81 @@
 # sower
-[![GitHub release](http://img.shields.io/github/release/wweir/sower.svg?style=popout)](https://github.com/wweir/sower/releases)
-[![CircleCI](https://img.shields.io/circleci/token/64114421aab286b6e918741071535250a5273f06/project/github/wweir/sower/master.svg?style=popout)](https://circleci.com/gh/wweir/sower)
-[![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)
 
-The sower is a cross-platform intelligent transparent proxy tool base on DNS solution.
+[![GitHub release](http://img.shields.io/github/release/sower-proxy/sower.svg?style=popout)](https://github.com/sower-proxy/sower/releases)
+[![Actions Status](https://github.com/sower-proxy/sower/workflows/Go/badge.svg)](https://github.com/sower-proxy/sower/actions)
+[![GitHub issue](https://img.shields.io/github/issues/sower-proxy/sower.svg?style=popout)](https://github.com/sower-proxy/sower/issues)
+[![GitHub star](https://img.shields.io/github/stars/sower-proxy/sower.svg?style=popout)](https://github.com/sower-proxy/sower/stargazers)
+[![GitHub license](https://img.shields.io/github/license/sower-proxy/sower.svg?style=popout)](LICENSE)
 
-The first time you visit a new website, sower will detect if the domain in block list and add it in suggect list. So that, you do not need to care about the rules, sower will handle it in a intelligent way.
+中文介绍见 [Wiki](https://github.com/sower-proxy/sower/wiki)
 
-If you wanna enjoy the sower, you need to deploy sower on both server and client side.
-On client side, sower listening UDP `53` and TCP `80`/`443` ports, so that you need run it with privileged.
-On server side, it just listening to a port (default `5533`), parse and relay the request to target server.
-
-Sower also provides an http(s) proxy listening on `:8080` by default. You can turn it off or use another port at any time.
+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.
 
+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
-After Deployed, please check your config file, it is placed in `/usr/local/etc/sower.toml` by default. Here is the example config file [**conf/sower.toml**](https://github.com/wweir/sower/blob/master/conf/sower.toml)
 
-### Auto deploy
-Auto deploy script support Linux server side and masOS/Linux client side.
+To enjoy sower, you need to deploy sower on both server-side(sowerd) and client-side(sower).
 
-```shell
-$ bash -c "$(curl -s https://raw.githubusercontent.com/wweir/sower/master/deploy/install)"
-```
+## Sowerd
 
-Then modify the configuration file as needed and set `127.0.0.1` as your first domain name server.
-In most situation, you just need to modify `/etc/resolv.conf`.
+_If you want to use sower as a secondary proxy to provide intelligent routing, you can skip sowerd._
 
-If you wanna uninstall sower, change `install` into `uninstall` and rerun the command.
+On the server-side, sowerd runs just like a web server proxy. It will bind two ports `80` / `443`.
 
-### Manually deploy
-1. Download the precompiled file from https://github.com/wweir/sower/releases
-2. Decompression the file into a folder
-3. Run `./sower -h` for help
-5. Config domain name server
-4. Config auto start
+`sowerd` validates its configuration at startup, redacts secrets from logs, and exits immediately if `80` / `443` listeners cannot be established.
 
-### Docker deploy
-The auto build docker images are [wweir/sower](https://hub.docker.com/r/wweir/sower).
+When `sowerd` runs as a system service without `HOME` or `XDG_CACHE_HOME`, it falls back to `/var/cache/sower` for certificate cache state so environment-only startup still works without a config file.
 
-It is very simple to use it on the server side. Export the port(5533) and run it directly.
+You can use your own certificate or the certificate automatically applied for by sowerd from [`Let's Encrypt`](https://letsencrypt.org/).
 
-But the client is more troublesome and needs some understanding of the working mechanism of the sower.
+When `fake_site` points to a local directory, `sowerd` serves that directory only through loopback fallback traffic on `127.0.0.1:80`, while public HTTP traffic is still redirected to HTTPS.
 
+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 interactively
+
+    ```shell
+    sudo sowerd -i
+    ```
+
+    The installer can copy the current binary to `/usr/local/bin/sowerd`, write `/etc/systemd/system/sowerd.service`, create `/etc/sower/sowerd.toml` when missing, and optionally start the service immediately.
+
+## Sower
+
+A config file is required on the sower client side. `sower.toml` is the default packaged example.
+
+`Sower` will bind 4 ports by default with root permission. They are: `udp(53)` / `tcp(80)` / `tcp(443)` / `tcp(1080)`.
+
+When DNS-based HTTPS proxying is enabled, `sower` listens on local `443/tcp`, reads the TLS ClientHello only to extract SNI, and forwards the original TLS stream to the selected upstream without terminating TLS.
+
+For `sower` and `trojan` upstreams, `remote.addr` now accepts either `host` or `host:port`. Optional `remote.tls` settings let the client override SNI, skip certificate verification, or use a uTLS client fingerprint such as `chrome` or `firefox`.
+
+Remote domain rule files can be filtered with per-router skip rules. For example, use `file_skip_rules = ["t.co"]` in the TOML `[router.block]` section to ignore a third-party blocklist entry while keeping explicit local `rules` intact.
+
+Remote rule files are downloaded through the configured upstream proxy, not through direct outbound HTTP. `sower` loads these rules before exposing local listeners, so an unreachable upstream proxy or rule URL fails startup instead of starting with incomplete routing state.
+
+`router.country.mmdb` is optional. Leave it empty to disable GeoIP lookup and use only configured CIDR rules for country-based direct routing.
+
+After doing the next three steps, you can enjoy the intelligent transparent proxy solution:
+
+1. Run the command with root permission:
+
+    ```shell
+    # sower -c sower.toml
+    ```
+
+2. Change your DNS server to `127.0.0.1`.
+
+3. Set your proxy to `socks5h://127.0.0.1:1080`.
 
 ## Architecture
-```
-          request target servers
-<-------------+              +------------->
-              |              |
-              |              |
-      +------------server-------------+
-      |       | relay service|        |
-      | +-----+---------------------+ |
-      | |                           | |
-      | | parse http(s) target url  | |
-      | |                           | |
-      | +---------------------------+ |
-      |     shadow service            |
-      +--------^----------------------+
-               |           request domain server
-       quic / KCP / TCP         +---------->
-               |                |
-      +--------+---client+------+-----+
-      |                  |            |
-      |  shadow service  |            |
-      |  relay service   |     dns    |
-      |                  |   service  |
-      |                  |            |
-      |       127.0.0.1 or other      |
-      |                  |            |
-      +-^-----^----------+---^----^---+
-        |     |              |    |
-        |     |              |    |   +----->
-http(s) proxy |   +----------+    |   |
-              2   1               1   2
-              +   +               +   +
-         blocked request      normal request
 
-```
-For more detail, see [透明代理 Sower 技术剖析](https://wweir.cc/post/%E9%80%8F%E6%98%8E%E4%BB%A3%E7%90%86-sower-%E6%8A%80%E6%9C%AF%E5%89%96%E6%9E%90/)
+![Architecture diagram](./sower.drawio.svg)
 
-
-## Todo
-- [x] authenticate
-- [ ] broker
-- [x] CI/CD
-- [ ] relay optimization
-- [ ] deploy script for all normal platform
-- [x] dns rule intelligent suggestions
+Detailed architecture and runtime design notes are in [ARCHITECTURE.md](./ARCHITECTURE.md).

cmd/sower/main.go

@@ -0,0 +1,427 @@
+package main
+
+import (
+	"bufio"
+	"compress/gzip"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net"
+	"net/http"
+	"os"
+	"os/signal"
+	"runtime"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/cristalhq/aconfig"
+	"github.com/cristalhq/aconfig/aconfigtoml"
+	"github.com/cristalhq/aconfig/aconfigyaml"
+	"github.com/lmittmann/tint"
+	"github.com/miekg/dns"
+	"github.com/sower-proxy/deferlog/v2"
+	"github.com/sower-proxy/sower/config"
+	"github.com/sower-proxy/sower/pkg/suffixtree"
+	"github.com/sower-proxy/sower/pkg/upstreamtls"
+	"github.com/sower-proxy/sower/router"
+)
+
+var (
+	version, date string
+	conf          config.SowerConfig
+)
+
+func init() {
+	fi, _ := os.Stdout.Stat()
+	noColor := (fi.Mode() & os.ModeCharDevice) == 0
+	deferlog.SetDefault(slog.New(tint.NewHandler(os.Stdout,
+		&tint.Options{AddSource: true, NoColor: noColor})))
+	if strings.HasSuffix(os.Args[0], ".test") {
+		return
+	}
+
+	if err := aconfig.LoaderFor(&conf, aconfig.Config{
+		AllowUnknownFields: false,
+		FileFlag:           "c",
+		Files: []string{
+			"sower.toml",
+			"sower.yaml",
+			"sower.yml",
+			"/etc/sower/sower.toml",
+			"/etc/sower/sower.yaml",
+			"/etc/sower/sower.yml",
+		},
+		FileDecoders: map[string]aconfig.FileDecoder{
+			".yml":  aconfigyaml.New(),
+			".yaml": aconfigyaml.New(),
+			".toml": aconfigtoml.New(),
+		},
+	}).Load(); err != nil {
+		slog.Error("load config", "error", err, "config", conf)
+		os.Exit(1)
+	}
+
+	if err := conf.Validate(); err != nil {
+		slog.Error("validate config", "error", err)
+		os.Exit(1)
+	}
+	slog.Info("starting sower",
+		"version", version,
+		"date", date,
+		"log_level", conf.LogLevel,
+		"remote_type", conf.Remote.Type,
+		"remote_addr", conf.Remote.Addr,
+		"remote_password", deferlog.Secret(conf.Remote.Password),
+		"remote_tls", conf.Remote.TLS,
+		"dns", conf.DNS,
+		"socks5", conf.Socks5,
+		"router", conf.Router)
+}
+
+func main() {
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	if err := run(ctx, stop, conf); err != nil {
+		slog.Error("run sower", "error", err)
+		os.Exit(1)
+	}
+}
+
+func run(ctx context.Context, stop context.CancelFunc, cfg config.SowerConfig) error {
+	upstreamDNS := effectiveUpstreamDNS(cfg)
+	proxyDial, err := GenProxyDial(cfg.Remote.Type, cfg.Remote.Addr, cfg.Remote.Password, upstreamDNS, upstreamtls.Options{
+		ServerName:         cfg.Remote.TLS.ServerName,
+		ClientHello:        cfg.Remote.TLS.ClientHello,
+		InsecureSkipVerify: cfg.Remote.TLS.InsecureSkipVerify,
+	})
+	if err != nil {
+		return fmt.Errorf("build proxy dialer: %w", err)
+	}
+	r := newRouter(cfg, proxyDial)
+
+	start := time.Now()
+	if err := loadRouterRules(ctx, r, proxyDial, cfg); err != nil {
+		return err
+	}
+
+	errCh := make(chan error, 8)
+	if err := startDNSListeners(ctx, cfg, r, errCh); err != nil {
+		return err
+	}
+	if err := startSocks5Listener(ctx, cfg, r, errCh); err != nil {
+		return err
+	}
+
+	slog.Info("loaded rules, proxy started", "took", time.Since(start),
+		"blockRule", r.BlockRule.Count, "directRule", r.DirectRule.Count, "proxyRule", r.ProxyRule.Count)
+	runtime.GC()
+
+	select {
+	case <-ctx.Done():
+		slog.Info("shutting down sower", "reason", ctx.Err())
+	case err := <-errCh:
+		slog.Error("serve failed", "error", err)
+		stop()
+	}
+	return nil
+}
+
+func effectiveUpstreamDNS(cfg config.SowerConfig) string {
+	if cfg.DNS.Upstream != "" {
+		return cfg.DNS.Upstream
+	}
+	return cfg.DNS.Fallback
+}
+
+func newRouter(cfg config.SowerConfig, proxyDial router.ProxyDialFn) *router.Router {
+	r := router.NewRouter([]string{cfg.DNS.Serve, cfg.DNS.Serve6}, cfg.DNS.Upstream, cfg.DNS.Fallback, cfg.Router.Country.MMDB, proxyDial)
+	r.BlockRule = suffixtree.NewNodeFromRules(cfg.Router.Block.Rules...)
+	r.DirectRule = suffixtree.NewNodeFromRules(cfg.Router.Direct.Rules...)
+	r.ProxyRule = suffixtree.NewNodeFromRules(cfg.Router.Proxy.Rules...)
+	r.AddCountryCIDRs(cfg.Router.Country.Rules...)
+	return r
+}
+
+func loadRouterRules(ctx context.Context, r *router.Router, proxyDial router.ProxyDialFn, cfg config.SowerConfig) error {
+	if err := loadRule(ctx, r.BlockRule, proxyDial, cfg.Router.Block.File, cfg.Router.Block.FilePrefix, cfg.Router.Block.FileSkipRules); err != nil {
+		return fmt.Errorf("load block rules: %w", err)
+	}
+	if err := loadRule(ctx, r.DirectRule, proxyDial, cfg.Router.Direct.File, cfg.Router.Direct.FilePrefix, cfg.Router.Direct.FileSkipRules); err != nil {
+		return fmt.Errorf("load direct rules: %w", err)
+	}
+	if err := loadRule(ctx, r.ProxyRule, proxyDial, cfg.Router.Proxy.File, cfg.Router.Proxy.FilePrefix, cfg.Router.Proxy.FileSkipRules); err != nil {
+		return fmt.Errorf("load proxy rules: %w", err)
+	}
+	countryLines, err := fetchRuleFile(ctx, proxyDial, cfg.Router.Country.File)
+	if err != nil {
+		return fmt.Errorf("load country rules: %w", err)
+	}
+	for _, line := range countryLines {
+		r.AddCountryCIDRs(line)
+	}
+	return nil
+}
+
+func startDNSListeners(ctx context.Context, cfg config.SowerConfig, r *router.Router, errCh chan<- error) error {
+	if cfg.DNS.Disable {
+		slog.Info("DNS proxy disabled")
+		return nil
+	}
+
+	for _, ip := range dnsListenIPs(cfg) {
+		if err := startHTTPListener(ctx, ip, r, errCh); err != nil {
+			return err
+		}
+		if err := startHTTPSListener(ctx, ip, r, errCh); err != nil {
+			return err
+		}
+		if err := startDNSUDPListener(ctx, ip, r, errCh); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func dnsListenIPs(cfg config.SowerConfig) []string {
+	ips := make([]string, 0, 2)
+	if strings.TrimSpace(cfg.DNS.Serve) != "" {
+		ips = append(ips, cfg.DNS.Serve)
+	}
+	if strings.TrimSpace(cfg.DNS.Serve6) != "" {
+		ips = append(ips, cfg.DNS.Serve6)
+	}
+	return ips
+}
+
+func startHTTPListener(ctx context.Context, ip string, r *router.Router, errCh chan<- error) error {
+	addr := net.JoinHostPort(ip, "80")
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		return fmt.Errorf("listen http proxy on %s: %w", addr, err)
+	}
+	slog.Info("service listening", "service", "http proxy", "network", "tcp", "addr", addr)
+	go closeOnDone(ctx, ln)
+	go serveAndReport(errCh, "http proxy", func() error {
+		return ServeHTTP(ctx, ln, r)
+	})
+	return nil
+}
+
+func startHTTPSListener(ctx context.Context, ip string, r *router.Router, errCh chan<- error) error {
+	addr := net.JoinHostPort(ip, "443")
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		return fmt.Errorf("listen https proxy on %s: %w", addr, err)
+	}
+	slog.Info("service listening", "service", "https proxy", "network", "tcp", "addr", addr)
+	go closeOnDone(ctx, ln)
+	go serveAndReport(errCh, "https proxy", func() error {
+		return ServeHTTPS(ctx, ln, r)
+	})
+	return nil
+}
+
+func startDNSUDPListener(ctx context.Context, ip string, r *router.Router, errCh chan<- error) error {
+	addr := net.JoinHostPort(ip, "53")
+	pc, err := net.ListenPacket("udp", addr)
+	if err != nil {
+		return fmt.Errorf("listen dns proxy on %s: %w", addr, err)
+	}
+
+	server := &dns.Server{
+		PacketConn: pc,
+		Handler:    r,
+	}
+	slog.Info("service listening", "service", "dns proxy", "network", "udp", "addr", addr)
+	go shutdownDNSServerOnDone(ctx, server)
+	go func() {
+		if err := server.ActivateAndServe(); err != nil && !errors.Is(err, net.ErrClosed) {
+			reportServeError(errCh, "dns proxy", fmt.Errorf("serve on %s: %w", addr, err))
+		}
+	}()
+	return nil
+}
+
+func startSocks5Listener(ctx context.Context, cfg config.SowerConfig, r *router.Router, errCh chan<- error) error {
+	if cfg.Socks5.Disable {
+		slog.Info("SOCKS5 proxy disabled")
+		return nil
+	}
+
+	ln, err := net.Listen("tcp", cfg.Socks5.Addr)
+	if err != nil {
+		return fmt.Errorf("listen socks5 proxy on %s: %w", cfg.Socks5.Addr, err)
+	}
+	slog.Info("service listening", "service", "socks5 proxy", "network", "tcp", "addr", cfg.Socks5.Addr)
+	go closeOnDone(ctx, ln)
+	go serveAndReport(errCh, "socks5 proxy", func() error {
+		return ServeSocks5(ctx, ln, r)
+	})
+	return nil
+}
+
+func loadRule(ctx context.Context, rule *suffixtree.Node, proxyDial router.ProxyDialFn, file, linePrefix string, skipRules []string) error {
+	skipRule := suffixtree.NewNodeFromRules(skipRules...)
+	lines, err := fetchRuleFile(ctx, proxyDial, file)
+	if err != nil {
+		return err
+	}
+	for _, line := range lines {
+		item := linePrefix + line
+		if skipRule.Match(line) || skipRule.Match(item) {
+			continue
+		}
+		rule.Add(item)
+	}
+	rule.GC()
+	return nil
+}
+
+func fetchRuleFile(ctx context.Context, proxyDial router.ProxyDialFn, file string) ([]string, error) {
+	if file == "" {
+		return nil, nil
+	}
+
+	var loadFn func() (io.ReadCloser, error)
+	if _, err := os.Stat(file); err == nil {
+		loadFn = func() (io.ReadCloser, error) {
+			return os.Open(file)
+		}
+	} else {
+		if proxyDial == nil {
+			return nil, fmt.Errorf("remote rule file %q requires upstream proxy dialer", file)
+		}
+		var lastDialErr error
+		client := &http.Client{
+			Timeout: 15 * time.Second,
+			Transport: &http.Transport{
+				DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+					domain, port, _ := net.SplitHostPort(addr)
+					p, _ := strconv.Atoi(port)
+					conn, err := proxyDial("tcp", domain, uint16(p))
+					if err != nil {
+						lastDialErr = err
+					}
+					return conn, err
+				},
+			},
+		}
+
+		loadFn = func() (io.ReadCloser, error) {
+			req, err := http.NewRequestWithContext(ctx, http.MethodGet, file, nil)
+			if err != nil {
+				return nil, err
+			}
+			req.Header.Add("Accept-Encoding", "gzip")
+			resp, err := client.Do(req)
+			if err != nil {
+				if ctx.Err() != nil && lastDialErr != nil {
+					return nil, fmt.Errorf("proxy dial failed before request cancellation: %v: %w", lastDialErr, ctx.Err())
+				}
+				return nil, err
+			}
+
+			if resp.StatusCode != http.StatusOK {
+				resp.Body.Close()
+				return nil, fmt.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
+		}
+		if ctx.Err() != nil {
+			return nil, fmt.Errorf("fetch rule file %q canceled after previous error %v: %w", file, err, ctx.Err())
+		}
+
+		// wait: 28.5s
+		timer := time.NewTimer(i * i * 100 * time.Millisecond)
+		select {
+		case <-ctx.Done():
+			timer.Stop()
+			return nil, fmt.Errorf("fetch rule file %q canceled after previous error %v: %w", file, err, ctx.Err())
+		case <-timer.C:
+		}
+		rc, err = loadFn()
+	}
+	if err != nil {
+		return nil, fmt.Errorf("fetch rule file %q: %w", file, err)
+	}
+
+	lines, err := readRuleLines(rc)
+	if err != nil {
+		return nil, fmt.Errorf("read rule file %q: %w", file, err)
+	}
+	return lines, nil
+}
+
+func readRuleLines(rc io.ReadCloser) ([]string, error) {
+	defer rc.Close()
+
+	br := bufio.NewReader(rc)
+	reader := io.Reader(br)
+	magic, err := br.Peek(2)
+	if err != nil && err != io.EOF && err != bufio.ErrBufferFull {
+		return nil, err
+	}
+	if len(magic) == 2 && magic[0] == 0x1f && magic[1] == 0x8b {
+		gr, err := gzip.NewReader(br)
+		if err != nil {
+			return nil, err
+		}
+		defer gr.Close()
+		reader = gr
+	}
+
+	lines := make([]string, 0)
+	lineReader := bufio.NewReader(reader)
+	for {
+		line, err := lineReader.ReadString('\n')
+		if err != nil && err != io.EOF {
+			return nil, err
+		}
+		line = strings.TrimSpace(line)
+		if line != "" {
+			lines = append(lines, line)
+		}
+		if err == io.EOF {
+			return lines, nil
+		}
+	}
+}
+
+func closeOnDone(ctx context.Context, closer io.Closer) {
+	<-ctx.Done()
+	_ = closer.Close()
+}
+
+func shutdownDNSServerOnDone(ctx context.Context, server *dns.Server) {
+	<-ctx.Done()
+	_ = server.ShutdownContext(ctx)
+}
+
+func reportServeError(errCh chan<- error, service string, err error) {
+	if err == nil || errors.Is(err, net.ErrClosed) {
+		return
+	}
+
+	select {
+	case errCh <- fmt.Errorf("%s: %w", service, err):
+	default:
+	}
+}
+
+func serveAndReport(errCh chan<- error, service string, serve func() error) {
+	reportServeError(errCh, service, serve())
+}

cmd/sower/main_test.go

@@ -0,0 +1,226 @@
+package main
+
+import (
+	"compress/gzip"
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"reflect"
+	"slices"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/sower-proxy/sower/config"
+	"github.com/sower-proxy/sower/pkg/suffixtree"
+)
+
+func TestFetchRuleFileEmptyPathReturnsClosedChannel(t *testing.T) {
+	t.Parallel()
+
+	lines, err := fetchRuleFile(context.Background(), nil, "")
+	if err != nil {
+		t.Fatalf("fetch empty rule file: %v", err)
+	}
+	if len(lines) != 0 {
+		t.Fatalf("unexpected lines for empty rule file path: %v", lines)
+	}
+}
+
+func TestNewRouterPreservesEmptyUpstreamForDiscovery(t *testing.T) {
+	t.Parallel()
+
+	cfg := config.SowerConfig{}
+	cfg.DNS.Serve = "127.0.0.1"
+	cfg.DNS.Upstream = ""
+	cfg.DNS.Fallback = "223.5.5.5"
+
+	r := newRouter(cfg, nil)
+	dnsState := reflect.ValueOf(r).Elem().FieldByName("dns")
+	upstreamDNS := dnsState.FieldByName("upstreamDNS").String()
+	fallbackDNS := dnsState.FieldByName("fallbackDNS").String()
+
+	if upstreamDNS != "" {
+		t.Fatalf("expected empty router upstream DNS to enable discovery, got %q", upstreamDNS)
+	}
+	if fallbackDNS != "223.5.5.5" {
+		t.Fatalf("unexpected fallback DNS: %q", fallbackDNS)
+	}
+}
+
+func TestFetchRuleFileRemoteGzip(t *testing.T) {
+	t.Parallel()
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Encoding", "gzip")
+		gz := gzip.NewWriter(w)
+		defer gz.Close()
+		_, _ = gz.Write([]byte("alpha\n\nbeta\n"))
+	}))
+	defer srv.Close()
+
+	dialFn := func(network, host string, port uint16) (net.Conn, error) {
+		return net.Dial(network, net.JoinHostPort(host, strconv.Itoa(int(port))))
+	}
+
+	got, err := fetchRuleFile(context.Background(), dialFn, srv.URL)
+	if err != nil {
+		t.Fatalf("fetch remote gzip rule file: %v", err)
+	}
+
+	want := []string{"alpha", "beta"}
+	if !slices.Equal(got, want) {
+		t.Fatalf("unexpected rules: got %v want %v", got, want)
+	}
+}
+
+func TestFetchRuleFileRemoteRequiresProxyDialer(t *testing.T) {
+	t.Parallel()
+
+	_, err := fetchRuleFile(context.Background(), nil, "https://example.com/rules.txt")
+	if err == nil {
+		t.Fatal("expected remote rule file without proxy dialer to fail")
+	}
+	if !strings.Contains(err.Error(), "requires upstream proxy dialer") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestFetchRuleFileCanceledIncludesPreviousError(t *testing.T) {
+	t.Parallel()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	dialErr := errors.New("proxy dial failed")
+	dialFn := func(network, host string, port uint16) (net.Conn, error) {
+		cancel()
+		return nil, dialErr
+	}
+
+	_, err := fetchRuleFile(ctx, dialFn, "https://example.com/rules.txt")
+	if err == nil {
+		t.Fatal("expected canceled fetch to fail")
+	}
+	if !strings.Contains(err.Error(), dialErr.Error()) {
+		t.Fatalf("expected previous error in cancellation message, got: %v", err)
+	}
+	if !errors.Is(err, context.Canceled) {
+		t.Fatalf("expected context.Canceled wrapping, got: %v", err)
+	}
+}
+
+func TestFetchRuleFileUsesProxyDialerForRemoteRules(t *testing.T) {
+	t.Parallel()
+
+	proxyHost := ""
+	dialFn := func(network, host string, port uint16) (net.Conn, error) {
+		proxyHost = host
+		return nil, fmt.Errorf("stop after proxy dial")
+	}
+
+	_, err := fetchRuleFile(context.Background(), dialFn, "https://example.com/rules.txt")
+	if err == nil {
+		t.Fatal("expected proxy dial failure")
+	}
+	if proxyHost != "example.com" {
+		t.Fatalf("expected remote host to be dialed through proxy, got %q", proxyHost)
+	}
+}
+
+func TestServeAndReportRunsServeFunction(t *testing.T) {
+	t.Parallel()
+
+	errCh := make(chan error, 1)
+	serveErr := errors.New("serve failed")
+	done := make(chan struct{})
+
+	go func() {
+		serveAndReport(errCh, "test service", func() error {
+			close(done)
+			return serveErr
+		})
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(time.Second):
+		t.Fatal("serve function was not called")
+	}
+
+	select {
+	case err := <-errCh:
+		if !errors.Is(err, serveErr) {
+			t.Fatalf("unexpected reported error: %v", err)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("serve error was not reported")
+	}
+}
+
+func TestLoadRuleSkipsOnlyFileRules(t *testing.T) {
+	t.Parallel()
+
+	path := writeGzipRuleFile(t, "t.co\nexample.com\n")
+	rule := suffixtree.NewNodeFromRules("manual.example")
+
+	if err := loadRule(context.Background(), rule, nil, path, "**.", []string{"t.co"}); err != nil {
+		t.Fatalf("load rule: %v", err)
+	}
+
+	if !rule.Match("manual.example") {
+		t.Fatal("expected existing manual rule to remain")
+	}
+	if rule.Match("t.co") {
+		t.Fatal("expected skipped file rule to be absent")
+	}
+	if !rule.Match("example.com") {
+		t.Fatal("expected non-skipped file rule to be loaded")
+	}
+}
+
+func TestLoadRuleSkipsPrefixedFileRule(t *testing.T) {
+	t.Parallel()
+
+	path := writeGzipRuleFile(t, "t.co\nexample.com\n")
+	rule := suffixtree.NewNodeFromRules()
+
+	if err := loadRule(context.Background(), rule, nil, path, "blocked.", []string{"blocked.t.co"}); err != nil {
+		t.Fatalf("load rule: %v", err)
+	}
+
+	if rule.Match("blocked.t.co") {
+		t.Fatal("expected prefixed file rule to be skipped")
+	}
+	if !rule.Match("blocked.example.com") {
+		t.Fatal("expected non-skipped prefixed file rule to be loaded")
+	}
+}
+
+func writeGzipRuleFile(t *testing.T, content string) string {
+	t.Helper()
+
+	path := t.TempDir() + "/rules.txt"
+	file, err := os.Create(path)
+	if err != nil {
+		t.Fatalf("create rule file: %v", err)
+	}
+	gz := gzip.NewWriter(file)
+	if _, err := gz.Write([]byte(content)); err != nil {
+		t.Fatalf("write gzip rule file: %v", err)
+	}
+	if err := gz.Close(); err != nil {
+		t.Fatalf("close gzip writer: %v", err)
+	}
+	if err := file.Close(); err != nil {
+		t.Fatalf("close rule file: %v", err)
+	}
+	if err := os.Chmod(path, 0o600); err != nil {
+		t.Fatalf("write rule file: %v", err)
+	}
+	return path
+}

cmd/sower/proxy.go

@@ -0,0 +1,394 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	stderrors "errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	utls "github.com/refraction-networking/utls"
+	"github.com/sower-proxy/conns/relay"
+	"github.com/sower-proxy/conns/reread"
+	"github.com/sower-proxy/sower/pkg/upstreamtls"
+	"github.com/sower-proxy/sower/router"
+	"github.com/sower-proxy/sower/transport"
+	"github.com/sower-proxy/sower/transport/socks5"
+	"github.com/sower-proxy/sower/transport/sower"
+	"github.com/sower-proxy/sower/transport/trojan"
+)
+
+const (
+	proxyDialTimeout = 10 * time.Second
+	proxyReadTimeout = 15 * time.Second
+
+	tlsRecordHeaderLen       = 5
+	tlsRecordTypeHandshake   = 22
+	tlsHandshakeTypeHello    = 1
+	maxTLSPlaintextRecordLen = 64 * 1024
+)
+
+func GenProxyDial(proxyType, proxyHost, proxyPassword, dns string, tlsOptions upstreamtls.Options) (router.ProxyDialFn, error) {
+	var proxy transport.Transport
+	var dialFn func() (net.Conn, error)
+
+	dialer := &net.Dialer{
+		Timeout:   proxyDialTimeout,
+		KeepAlive: 30 * time.Second,
+		Resolver: &net.Resolver{
+			PreferGo: true,
+			Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+				d := net.Dialer{Timeout: proxyDialTimeout}
+				c, err := d.DialContext(ctx, "udp", net.JoinHostPort(dns, "53"))
+				if err != nil {
+					slog.Warn("dial fallback dns failed, use default dns setting", "error", err)
+					c, err = d.DialContext(ctx, network, address)
+				}
+				return c, err
+			},
+		},
+	}
+
+	switch proxyType {
+	case "sower", "trojan":
+		tlsDialFn, err := newTLSDialFn(dialer, proxyHost, tlsOptions)
+		if err != nil {
+			return nil, err
+		}
+		if proxyType == "sower" {
+			proxy = sower.New(proxyPassword)
+		} else {
+			proxy = trojan.New(proxyPassword)
+		}
+		dialFn = tlsDialFn
+	case "socks5":
+		proxy = socks5.New()
+		dialFn = func() (net.Conn, error) {
+			return dialer.Dial("tcp", proxyHost)
+		}
+	default:
+		return nil, fmt.Errorf("unknown proxy type %q", proxyType)
+	}
+
+	return func(network, host string, port uint16) (net.Conn, error) {
+		if host == "" || port == 0 {
+			return nil, fmt.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
+	}, nil
+}
+
+func newTLSDialFn(dialer *net.Dialer, proxyHost string, tlsOptions upstreamtls.Options) (func() (net.Conn, error), error) {
+	dialAddr, err := upstreamDialAddr(proxyHost, "443")
+	if err != nil {
+		return nil, err
+	}
+	if tlsOptions.ClientHello != "" {
+		if err := upstreamtls.ValidateClientHello(tlsOptions.ClientHello); err != nil {
+			return nil, err
+		}
+	}
+
+	return func() (net.Conn, error) {
+		return upstreamtls.Dial(dialer, "tcp", dialAddr, tlsOptions)
+	}, nil
+}
+
+func upstreamDialAddr(addr, defaultPort string) (string, error) {
+	if host, port, err := net.SplitHostPort(addr); err == nil {
+		if host == "" || port == "" {
+			return "", fmt.Errorf("invalid remote address %q", addr)
+		}
+		return net.JoinHostPort(host, port), nil
+	}
+
+	if addr == "" {
+		return "", fmt.Errorf("empty remote address")
+	}
+	if strings.HasPrefix(addr, "[") || strings.HasSuffix(addr, "]") {
+		return "", fmt.Errorf("invalid remote address %q", addr)
+	}
+	if strings.Count(addr, ":") == 1 {
+		return "", fmt.Errorf("missing or invalid port in %q", addr)
+	}
+	return net.JoinHostPort(addr, defaultPort), nil
+}
+
+func ServeHTTP(ctx context.Context, ln net.Listener, r *router.Router) error {
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			if shouldRetryAccept(ctx, "http", err) {
+				continue
+			}
+			return wrapAcceptErr(ctx, "http", err)
+		}
+		go handleHTTPConn(conn, r)
+	}
+}
+
+func ServeHTTPS(ctx context.Context, ln net.Listener, r *router.Router) error {
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			if shouldRetryAccept(ctx, "https", err) {
+				continue
+			}
+			return wrapAcceptErr(ctx, "https", err)
+		}
+		go handleHTTPSConn(conn, r)
+	}
+}
+
+func ServeSocks5(ctx context.Context, ln net.Listener, r *router.Router) error {
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			if shouldRetryAccept(ctx, "socks5", err) {
+				continue
+			}
+			return wrapAcceptErr(ctx, "socks5", err)
+		}
+		go handleSocks5Conn(conn, r)
+	}
+}
+
+func handleHTTPConn(conn net.Conn, r *router.Router) {
+	start := time.Now()
+	rereadConn := reread.New(conn)
+	defer rereadConn.Close()
+
+	_ = rereadConn.SetDeadline(time.Now().Add(proxyReadTimeout))
+	req, err := http.ReadRequest(bufio.NewReader(rereadConn))
+	if err != nil {
+		slog.Error("read http request", "error", err)
+		return
+	}
+	_ = rereadConn.SetDeadline(time.Time{})
+
+	rc, err := r.ProxyDial("tcp", req.Host, 80)
+	if err != nil {
+		slog.Error("dial proxy", "error", err, "host", req.Host, "req", req.URL)
+		return
+	}
+	defer rc.Close()
+
+	rereadConn.Stop().Reread()
+	err = relay.Relay(rereadConn, rc)
+	if err != nil {
+		slog.Debug("serve http", "error", err, "host", req.Host, "spend", time.Since(start))
+	}
+}
+
+func handleHTTPSConn(conn net.Conn, r *router.Router) {
+	start := time.Now()
+	rereadConn := reread.New(conn)
+	defer rereadConn.Close()
+
+	_ = rereadConn.SetDeadline(time.Now().Add(proxyReadTimeout))
+	domain, err := peekTLSClientHelloServerName(rereadConn)
+	if err != nil {
+		slog.Debug("read tls client hello", "error", err)
+		return
+	}
+	if domain == "" {
+		slog.Debug("tls client hello missing server name")
+		return
+	}
+	_ = rereadConn.SetDeadline(time.Time{})
+
+	rc, err := r.ProxyDial("tcp", domain, 443)
+	if err != nil {
+		slog.Error("dial proxy", "error", err, "host", domain)
+		return
+	}
+	defer rc.Close()
+
+	rereadConn.Stop().Reread()
+	err = relay.Relay(rereadConn, rc)
+	if err != nil {
+		slog.Debug("serve https", "error", err, "host", domain, "spend", time.Since(start))
+	}
+}
+
+func peekTLSClientHelloServerName(conn io.Reader) (string, error) {
+	clientHello, err := readTLSClientHello(conn)
+	if err != nil {
+		return "", err
+	}
+
+	hello := utls.UnmarshalClientHello(clientHello)
+	if hello == nil {
+		return "", fmt.Errorf("parse tls client hello")
+	}
+	return hello.ServerName, nil
+}
+
+func readTLSClientHello(conn io.Reader) ([]byte, error) {
+	clientHello := make([]byte, 0, 1024)
+
+	for {
+		header := make([]byte, tlsRecordHeaderLen)
+		if _, err := io.ReadFull(conn, header); err != nil {
+			return nil, fmt.Errorf("read tls record header: %w", err)
+		}
+		if header[0] != tlsRecordTypeHandshake {
+			return nil, fmt.Errorf("unexpected tls record type %d", header[0])
+		}
+
+		recordLen := int(header[3])<<8 | int(header[4])
+		if recordLen <= 0 || recordLen > maxTLSPlaintextRecordLen {
+			return nil, fmt.Errorf("invalid tls record length %d", recordLen)
+		}
+
+		recordBody := make([]byte, recordLen)
+		if _, err := io.ReadFull(conn, recordBody); err != nil {
+			return nil, fmt.Errorf("read tls record body: %w", err)
+		}
+		clientHello = append(clientHello, recordBody...)
+
+		if len(clientHello) < 4 {
+			continue
+		}
+		if clientHello[0] != tlsHandshakeTypeHello {
+			return nil, fmt.Errorf("unexpected tls handshake type %d", clientHello[0])
+		}
+
+		helloLen := int(clientHello[1])<<16 | int(clientHello[2])<<8 | int(clientHello[3])
+		if helloLen == 0 {
+			return nil, fmt.Errorf("empty tls client hello")
+		}
+		if len(clientHello) < 4+helloLen {
+			continue
+		}
+
+		return clientHello[:4+helloLen], nil
+	}
+}
+
+func handleSocks5Conn(conn net.Conn, r *router.Router) {
+	defer conn.Close()
+
+	rereadConn := reread.New(conn)
+	_ = rereadConn.SetDeadline(time.Now().Add(proxyReadTimeout))
+
+	byte1 := make([]byte, 1)
+	if n, err := rereadConn.Read(byte1); err != nil || n != 1 {
+		slog.Error("read first byte", "error", err)
+		return
+	}
+	rereadConn.Reread()
+	_ = rereadConn.SetDeadline(time.Time{})
+
+	if byte1[0] == 5 {
+		rereadConn.Stop()
+		server := socks5.New()
+		addr, err := server.ReadRequest(rereadConn)
+		if err != nil {
+			slog.Error("read socks5 request", "error", err)
+			return
+		}
+
+		host, port := addr.(*socks5.AddrHead).Addr()
+		rc, err := r.Dial("tcp", host, port)
+		if err != nil {
+			if replyErr := server.WriteReply(rereadConn, routeSocks5ReplyCode(err)); replyErr != nil {
+				slog.Debug("write socks5 failure reply", "error", replyErr, "host", host, "port", port)
+			}
+			return
+		}
+		defer rc.Close()
+
+		if err := server.WriteReply(rereadConn, socks5.RepSucceeded); err != nil {
+			slog.Debug("write socks5 success reply", "error", err, "host", host, "port", port)
+			return
+		}
+		_ = relay.Relay(rereadConn, rc)
+		return
+	}
+
+	req, err := http.ReadRequest(bufio.NewReader(rereadConn))
+	if err != nil {
+		slog.Error("read http request", "error", err)
+		return
+	}
+
+	host, port, err := router.ParseHostPort(req.Host, req.URL)
+	if err != nil {
+		rereadConn.Stop().Write([]byte("HTTP/1.1 400 Bad Request\r\n\r\n"))
+		return
+	}
+
+	rc, err := r.Dial("tcp", host, port)
+	if err != nil {
+		writeHTTPProxyError(rereadConn.Stop(), err)
+		return
+	}
+	defer rc.Close()
+
+	if req.Method == http.MethodConnect {
+		rereadConn.Stop().Reset()
+		if _, err := rereadConn.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n")); err != nil {
+			slog.Debug("write connect response", "error", err, "host", host, "port", port)
+			return
+		}
+	} else {
+		rereadConn.Stop().Reread()
+	}
+
+	if err := relay.Relay(rereadConn, rc); err != nil {
+		slog.Debug("serve proxy request", "error", err, "host", host, "port", port, "method", req.Method)
+	}
+}
+
+func shouldRetryAccept(ctx context.Context, protocol string, err error) bool {
+	if err == nil || ctx.Err() != nil {
+		return false
+	}
+	if ne, ok := err.(net.Error); ok && ne.Temporary() {
+		slog.Warn("temporary accept failed", "protocol", protocol, "error", err)
+		time.Sleep(200 * time.Millisecond)
+		return true
+	}
+	return false
+}
+
+func wrapAcceptErr(ctx context.Context, protocol string, err error) error {
+	if err == nil || ctx.Err() != nil {
+		return nil
+	}
+	return fmt.Errorf("accept %s connection: %w", protocol, err)
+}
+
+func writeHTTPProxyError(conn net.Conn, err error) {
+	status := "502 Bad Gateway"
+	if stderrors.Is(err, router.ErrBlocked) {
+		status = "403 Forbidden"
+	}
+	if _, writeErr := conn.Write([]byte("HTTP/1.1 " + status + "\r\n\r\n")); writeErr != nil {
+		slog.Debug("write http proxy error", "error", writeErr, "status", status)
+	}
+}
+
+func routeSocks5ReplyCode(err error) byte {
+	if stderrors.Is(err, router.ErrBlocked) {
+		return socks5.RepConnectionNotAllowed
+	}
+	return socks5.RepGeneralFailure
+}

cmd/sower/proxy_test.go

@@ -0,0 +1,323 @@
+package main
+
+import (
+	"crypto/tls"
+	"io"
+	"net"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/sower-proxy/sower/pkg/suffixtree"
+	"github.com/sower-proxy/sower/pkg/upstreamtls"
+	"github.com/sower-proxy/sower/router"
+)
+
+func TestGenProxyDialRejectsUnknownProxyType(t *testing.T) {
+	t.Parallel()
+
+	if _, err := GenProxyDial("unknown", "example.com", "", "8.8.8.8", upstreamtls.Options{}); err == nil {
+		t.Fatal("expected error for unknown proxy type")
+	}
+}
+
+func TestGenProxyDialRejectsInvalidTLSClientHello(t *testing.T) {
+	t.Parallel()
+
+	_, err := GenProxyDial("sower", "example.com", "", "8.8.8.8", upstreamtls.Options{
+		ClientHello: "invalid",
+	})
+	if err == nil {
+		t.Fatal("expected error for invalid TLS client hello")
+	}
+}
+
+func TestUpstreamDialAddrAddsDefaultPort(t *testing.T) {
+	t.Parallel()
+
+	addr, err := upstreamDialAddr("example.com", "443")
+	if err != nil {
+		t.Fatalf("upstream dial addr: %v", err)
+	}
+	if addr != "example.com:443" {
+		t.Fatalf("unexpected dial addr: %q", addr)
+	}
+}
+
+func TestUpstreamDialAddrPreservesExplicitPort(t *testing.T) {
+	t.Parallel()
+
+	addr, err := upstreamDialAddr("example.com:8443", "443")
+	if err != nil {
+		t.Fatalf("upstream dial addr: %v", err)
+	}
+	if addr != "example.com:8443" {
+		t.Fatalf("unexpected dial addr: %q", addr)
+	}
+}
+
+func TestHandleSocks5ConnReturnsForbiddenForBlockedConnect(t *testing.T) {
+	server, client := net.Pipe()
+	defer client.Close()
+
+	r := newTestRouter()
+	go handleSocks5Conn(server, r)
+
+	client.SetDeadline(time.Now().Add(2 * time.Second))
+	if _, err := io.WriteString(client, "CONNECT example.com:443 HTTP/1.1\r\nHost: example.com:443\r\n\r\n"); err != nil {
+		t.Fatalf("write request: %v", err)
+	}
+
+	resp, err := io.ReadAll(client)
+	if err != nil {
+		t.Fatalf("read response: %v", err)
+	}
+	if !strings.HasPrefix(string(resp), "HTTP/1.1 403 Forbidden") {
+		t.Fatalf("unexpected response: %q", string(resp))
+	}
+}
+
+func TestHandleSocks5ConnReturnsSocks5FailureForBlockedRequest(t *testing.T) {
+	server, client := net.Pipe()
+	defer client.Close()
+
+	r := newTestRouter()
+	go handleSocks5Conn(server, r)
+
+	client.SetDeadline(time.Now().Add(2 * time.Second))
+	if _, err := client.Write([]byte{0x05, 0x01, 0x00}); err != nil {
+		t.Fatalf("write auth request: %v", err)
+	}
+
+	authResp := make([]byte, 2)
+	if _, err := io.ReadFull(client, authResp); err != nil {
+		t.Fatalf("read auth response: %v", err)
+	}
+	if authResp[0] != 0x05 || authResp[1] != 0x00 {
+		t.Fatalf("unexpected auth response: %v", authResp)
+	}
+
+	req := []byte{0x05, 0x01, 0x00, 0x03, 0x0b}
+	req = append(req, []byte("example.com")...)
+	req = append(req, 0x01, 0xbb)
+	if _, err := client.Write(req); err != nil {
+		t.Fatalf("write connect request: %v", err)
+	}
+
+	reply := make([]byte, 10)
+	if _, err := io.ReadFull(client, reply); err != nil {
+		t.Fatalf("read connect reply: %v", err)
+	}
+	if reply[1] != 0x02 {
+		t.Fatalf("expected connection-not-allowed reply, got %d", reply[1])
+	}
+}
+
+func TestPeekTLSClientHelloServerName(t *testing.T) {
+	t.Parallel()
+
+	server, client := net.Pipe()
+	defer client.Close()
+
+	hello := generateTLSClientHelloRecord(t, "github.com")
+	go func() {
+		_, _ = client.Write(hello)
+		_ = client.Close()
+	}()
+
+	got, err := peekTLSClientHelloServerName(server)
+	_ = server.Close()
+	if err != nil {
+		t.Fatalf("peek tls client hello: %v", err)
+	}
+	if got != "github.com" {
+		t.Fatalf("unexpected server name: %q", got)
+	}
+}
+
+func TestHandleHTTPSConnRelaysClientHelloToUpstream(t *testing.T) {
+	t.Parallel()
+
+	downstreamServer, downstreamClient := net.Pipe()
+	defer downstreamClient.Close()
+
+	upstreamClient, upstreamServer := net.Pipe()
+	defer upstreamServer.Close()
+
+	hello := generateTLSClientHelloRecord(t, "github.com")
+	response := []byte("upstream-response")
+
+	var (
+		gotHost string
+		gotPort uint16
+	)
+	r := &router.Router{
+		BlockRule:  suffixtree.NewNodeFromRules(),
+		DirectRule: suffixtree.NewNodeFromRules(),
+		ProxyRule:  suffixtree.NewNodeFromRules(),
+		ProxyDial: func(network, host string, port uint16) (net.Conn, error) {
+			gotHost = host
+			gotPort = port
+			return upstreamClient, nil
+		},
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		handleHTTPSConn(downstreamServer, r)
+	}()
+
+	writeErrCh := make(chan error, 1)
+	go func() {
+		_, err := downstreamClient.Write(hello)
+		writeErrCh <- err
+	}()
+
+	gotHello := make([]byte, len(hello))
+	upstreamServer.SetReadDeadline(time.Now().Add(2 * time.Second))
+	if _, err := io.ReadFull(upstreamServer, gotHello); err != nil {
+		t.Fatalf("read upstream client hello: %v", err)
+	}
+	if string(gotHello) != string(hello) {
+		t.Fatal("client hello was not relayed intact")
+	}
+	if err := <-writeErrCh; err != nil {
+		t.Fatalf("write downstream client hello: %v", err)
+	}
+
+	readErrCh := make(chan error, 1)
+	gotResp := make([]byte, len(response))
+	go func() {
+		_, err := io.ReadFull(downstreamClient, gotResp)
+		readErrCh <- err
+	}()
+
+	upstreamServer.SetWriteDeadline(time.Now().Add(2 * time.Second))
+	if _, err := upstreamServer.Write(response); err != nil {
+		t.Fatalf("write upstream response: %v", err)
+	}
+	if err := <-readErrCh; err != nil {
+		t.Fatalf("read downstream response: %v", err)
+	}
+	if string(gotResp) != string(response) {
+		t.Fatalf("unexpected downstream response: %q", gotResp)
+	}
+	if gotHost != "github.com" || gotPort != 443 {
+		t.Fatalf("unexpected proxy target: %s:%d", gotHost, gotPort)
+	}
+
+	_ = downstreamClient.Close()
+	_ = upstreamServer.Close()
+	wg.Wait()
+}
+
+func TestHandleHTTPSConnRelaysClientHelloAfterReadingSNI(t *testing.T) {
+	server, client := net.Pipe()
+	upstreamClient, upstreamServer := net.Pipe()
+	defer server.Close()
+	defer client.Close()
+	defer upstreamClient.Close()
+	defer upstreamServer.Close()
+
+	hostCh := make(chan string, 1)
+	r := &router.Router{
+		ProxyDial: func(network, host string, port uint16) (net.Conn, error) {
+			if network != "tcp" {
+				t.Errorf("unexpected network: %s", network)
+			}
+			if port != 443 {
+				t.Errorf("unexpected port: %d", port)
+			}
+			hostCh <- host
+			return upstreamClient, nil
+		},
+	}
+
+	go handleHTTPSConn(server, r)
+
+	tlsClient := tls.Client(client, &tls.Config{
+		ServerName:         "example.com",
+		InsecureSkipVerify: true,
+	})
+	_ = client.SetDeadline(time.Now().Add(2 * time.Second))
+	_ = upstreamServer.SetDeadline(time.Now().Add(2 * time.Second))
+
+	handshakeDone := make(chan error, 1)
+	go func() {
+		handshakeDone <- tlsClient.Handshake()
+	}()
+
+	select {
+	case host := <-hostCh:
+		if host != "example.com" {
+			t.Fatalf("unexpected SNI host: %q", host)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("proxy dial was not called")
+	}
+
+	recordHeader := make([]byte, 5)
+	if _, err := io.ReadFull(upstreamServer, recordHeader); err != nil {
+		t.Fatalf("read relayed TLS record header: %v", err)
+	}
+	if recordHeader[0] != 0x16 {
+		t.Fatalf("expected relayed TLS handshake record, got %#x", recordHeader[0])
+	}
+
+	_ = client.Close()
+	_ = upstreamServer.Close()
+	select {
+	case <-handshakeDone:
+	case <-time.After(2 * time.Second):
+		t.Fatal("tls client handshake did not return after connections closed")
+	}
+}
+
+func generateTLSClientHelloRecord(t *testing.T, serverName string) []byte {
+	t.Helper()
+
+	clientConn, serverConn := net.Pipe()
+	defer clientConn.Close()
+	defer serverConn.Close()
+
+	errCh := make(chan error, 1)
+	go func() {
+		tlsConn := tls.Client(clientConn, &tls.Config{
+			ServerName:         serverName,
+			InsecureSkipVerify: true,
+		})
+		errCh <- tlsConn.Handshake()
+		_ = tlsConn.Close()
+	}()
+
+	serverConn.SetReadDeadline(time.Now().Add(2 * time.Second))
+	header := make([]byte, tlsRecordHeaderLen)
+	if _, err := io.ReadFull(serverConn, header); err != nil {
+		t.Fatalf("read tls record header: %v", err)
+	}
+
+	recordLen := int(header[3])<<8 | int(header[4])
+	record := make([]byte, len(header)+recordLen)
+	copy(record, header)
+	if _, err := io.ReadFull(serverConn, record[len(header):]); err != nil {
+		t.Fatalf("read tls record body: %v", err)
+	}
+
+	_ = serverConn.Close()
+	<-errCh
+	return record
+}
+
+func newTestRouter() *router.Router {
+	return &router.Router{
+		BlockRule:  suffixtree.NewNodeFromRules("example.com"),
+		DirectRule: suffixtree.NewNodeFromRules(),
+		ProxyRule:  suffixtree.NewNodeFromRules(),
+		ProxyDial: func(network, host string, port uint16) (net.Conn, error) {
+			return nil, router.ErrBlocked
+		},
+	}
+}

cmd/sowerd/main.go

@@ -0,0 +1,365 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/cristalhq/aconfig"
+	"github.com/cristalhq/aconfig/aconfigtoml"
+	"github.com/cristalhq/aconfig/aconfigyaml"
+	"github.com/lmittmann/tint"
+	"github.com/sower-proxy/conns/relay"
+	"github.com/sower-proxy/conns/reread"
+	"github.com/sower-proxy/deferlog/v2"
+	"github.com/sower-proxy/sower/config"
+	"github.com/sower-proxy/sower/internal/install"
+	transportSower "github.com/sower-proxy/sower/transport/sower"
+	"github.com/sower-proxy/sower/transport/trojan"
+	"golang.org/x/crypto/acme/autocert"
+)
+
+const (
+	httpShutdownTimeout = 5 * time.Second
+	probeTimeout        = 10 * time.Second
+	systemCacheDir      = "/var/cache/sower"
+)
+
+var (
+	version, date string
+)
+
+func init() {
+	setLogger(slog.LevelInfo)
+}
+
+func main() {
+	if hasInstallFlag(os.Args[1:]) {
+		if err := install.InstallService(stdinConfirm); err != nil {
+			slog.Error("install service", "error", err)
+			os.Exit(1)
+		}
+		return
+	}
+
+	conf, err := loadConfig()
+	if err != nil {
+		slog.Error("load config", "error", err)
+		os.Exit(1)
+	}
+
+	setLogger(conf.LogLevel)
+	slog.Info("load config",
+		"version", version,
+		"date", date,
+		"config", sanitizeConfig(conf))
+
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	if err := run(ctx, conf); err != nil {
+		slog.Error("sowerd exited", "error", err)
+		os.Exit(1)
+	}
+}
+
+func loadConfig() (config.SowerdConfig, error) {
+	var conf config.SowerdConfig
+	if err := aconfig.LoaderFor(&conf, aconfig.Config{
+		AllowUnknownFlags:  false,
+		AllowUnknownFields: false,
+		FileFlag:           "c",
+		Files: []string{
+			"sowerd.toml",
+			"sowerd.yaml",
+			"sowerd.yml",
+			"config/sowerd.toml",
+			"config/sowerd.yaml",
+			"config/sowerd.yml",
+			"/etc/sower/sowerd.toml",
+			"/etc/sower/sowerd.yaml",
+			"/etc/sower/sowerd.yml",
+		},
+		FileDecoders: map[string]aconfig.FileDecoder{
+			".yml":  aconfigyaml.New(),
+			".yaml": aconfigyaml.New(),
+			".toml": aconfigtoml.New(),
+		},
+	}).Load(); err != nil {
+		return config.SowerdConfig{}, err
+	}
+	if err := conf.Validate(); err != nil {
+		return config.SowerdConfig{}, err
+	}
+	return conf, nil
+}
+
+func run(ctx context.Context, conf config.SowerdConfig) error {
+	cacheDir, err := cacheDir()
+	if err != nil {
+		return err
+	}
+
+	certManager, tlsConf, err := buildTLSConfig(cacheDir, conf)
+	if err != nil {
+		return err
+	}
+
+	fakeSite, dirServer, err := prepareFakeSite(conf.FakeSite)
+	if err != nil {
+		return err
+	}
+
+	httpAddr := net.JoinHostPort(conf.ServeIP, "80")
+	httpServer := &http.Server{
+		Addr:    httpAddr,
+		Handler: certManager.HTTPHandler(fakeSiteHandler(dirServer)),
+	}
+
+	httpErrCh := make(chan error, 1)
+	go func() {
+		err := httpServer.ListenAndServe()
+		if err != nil && !errors.Is(err, http.ErrServerClosed) {
+			httpErrCh <- fmt.Errorf("listen http %s: %w", httpAddr, err)
+		}
+		close(httpErrCh)
+	}()
+
+	httpsAddr := net.JoinHostPort(conf.ServeIP, "443")
+	ln, err := tls.Listen("tcp", httpsAddr, tlsConf)
+	if err != nil {
+		_ = shutdownHTTP(context.Background(), httpServer)
+		return fmt.Errorf("listen https %s: %w", httpsAddr, err)
+	}
+	defer ln.Close()
+
+	httpsErrCh := make(chan error, 1)
+	go func() {
+		httpsErrCh <- serve443(ctx, ln, fakeSite, transportSower.New(conf.Password), trojan.New(conf.Password))
+		close(httpsErrCh)
+	}()
+
+	select {
+	case err := <-httpErrCh:
+		if err != nil {
+			_ = ln.Close()
+			return err
+		}
+	case err := <-httpsErrCh:
+		if err != nil {
+			_ = shutdownHTTP(context.Background(), httpServer)
+			return err
+		}
+	case <-ctx.Done():
+	}
+
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), httpShutdownTimeout)
+	defer cancel()
+
+	_ = ln.Close()
+	if err := shutdownHTTP(shutdownCtx, httpServer); err != nil {
+		return err
+	}
+	return nil
+}
+
+func cacheDir() (string, error) {
+	dir, fallbackErr := resolveCacheDir(os.UserCacheDir, systemCacheDir)
+	if fallbackErr != nil {
+		slog.Warn("user cache dir unavailable, fallback to system cache dir",
+			"error", fallbackErr,
+			"dir", dir)
+	}
+	if err := os.MkdirAll(dir, 0o700); err != nil {
+		return "", fmt.Errorf("create cache dir %s: %w", dir, err)
+	}
+	return dir, nil
+}
+
+func resolveCacheDir(userCacheDir func() (string, error), fallbackDir string) (string, error) {
+	base, err := userCacheDir()
+	if err != nil {
+		return fallbackDir, err
+	}
+	return filepath.Join(base, "sower"), nil
+}
+
+func buildTLSConfig(cacheDir string, cfg config.SowerdConfig) (*autocert.Manager, *tls.Config, error) {
+	certManager := &autocert.Manager{
+		Prompt: autocert.AcceptTOS,
+		Email:  cfg.Cert.Email,
+		Cache:  autocert.DirCache(cacheDir),
+	}
+
+	tlsConf := &tls.Config{
+		GetCertificate: certManager.GetCertificate,
+		MinVersion:     tls.VersionTLS12,
+		NextProtos:     []string{"http/1.1", "h2"},
+	}
+
+	if cfg.Cert.Cert == "" {
+		return certManager, tlsConf, nil
+	}
+
+	cert, err := tls.LoadX509KeyPair(cfg.Cert.Cert, cfg.Cert.Key)
+	if err != nil {
+		return nil, nil, fmt.Errorf("load cert pair: %w", err)
+	}
+
+	tlsConf.GetCertificate = nil
+	tlsConf.Certificates = []tls.Certificate{cert}
+	return certManager, tlsConf, nil
+}
+
+func prepareFakeSite(fakeSite string) (string, http.Handler, error) {
+	si, err := os.Stat(fakeSite)
+	if err == nil && si.IsDir() {
+		slog.Info("serve fake site on http", "dir", fakeSite)
+		return "127.0.0.1:80", http.FileServer(http.Dir(fakeSite)), nil
+	}
+	if err != nil && !os.IsNotExist(err) {
+		return "", nil, fmt.Errorf("stat fake site: %w", err)
+	}
+	return fakeSite, nil, nil
+}
+
+func fakeSiteHandler(dirServer http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if dirServer != nil && isLoopbackRemoteAddr(r.RemoteAddr) {
+			dirServer.ServeHTTP(w, r)
+			return
+		}
+
+		target := "https://" + r.Host + r.URL.RequestURI()
+		http.Redirect(w, r, target, http.StatusPermanentRedirect)
+	})
+}
+
+func serve443(ctx context.Context, ln net.Listener, fakeSite string, sower *transportSower.Sower, trojan *trojan.Trojan) error {
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			if ctx.Err() != nil || errors.Is(err, net.ErrClosed) {
+				return nil
+			}
+
+			var netErr net.Error
+			if errors.As(err, &netErr) && netErr.Temporary() {
+				slog.Warn("temporary accept error", "error", err)
+				time.Sleep(100 * time.Millisecond)
+				continue
+			}
+			return fmt.Errorf("accept tls connection: %w", err)
+		}
+
+		go handleConn(conn, fakeSite, sower, trojan)
+	}
+}
+
+func handleConn(conn net.Conn, fakeSite string, sower *transportSower.Sower, trojan *trojan.Trojan) {
+	rereadConn := reread.New(conn)
+	defer rereadConn.Close()
+
+	_ = rereadConn.SetReadDeadline(time.Now().Add(probeTimeout))
+
+	var (
+		addr net.Addr
+		dur  time.Duration
+		err  error
+	)
+	defer func() {
+		deferlog.DebugWarn(err, "relay conn", "took", dur, "addr", addr)
+	}()
+
+	rereadConn.Reread()
+	if addr, err = sower.Unwrap(rereadConn); err == nil {
+		rereadConn.Stop()
+		_ = rereadConn.SetReadDeadline(time.Time{})
+		dur, err = relay.RelayTo(rereadConn, addr.String())
+		return
+	}
+
+	rereadConn.Reread()
+	if addr, err = trojan.Unwrap(rereadConn); err == nil {
+		rereadConn.Stop()
+		_ = rereadConn.SetReadDeadline(time.Time{})
+		dur, err = relay.RelayTo(rereadConn, addr.String())
+		return
+	}
+
+	rereadConn.Stop().Reread()
+	_ = rereadConn.SetReadDeadline(time.Time{})
+	dur, err = relay.RelayTo(rereadConn, fakeSite)
+}
+
+func sanitizeConfig(cfg config.SowerdConfig) map[string]any {
+	return map[string]any{
+		"log_level": cfg.LogLevel.String(),
+		"serve_ip":  cfg.ServeIP,
+		"fake_site": cfg.FakeSite,
+		"cert": map[string]any{
+			"email":       cfg.Cert.Email,
+			"cert_config": cfg.Cert.Cert != "",
+			"key_config":  cfg.Cert.Key != "",
+		},
+	}
+}
+
+func hasInstallFlag(args []string) bool {
+	for _, arg := range args {
+		switch arg {
+		case "-i", "--install":
+			return true
+		}
+	}
+	return false
+}
+
+func stdinConfirm(label string) bool {
+	fmt.Printf("%s [y/N]: ", label)
+	scanner := bufio.NewScanner(os.Stdin)
+	if !scanner.Scan() {
+		return false
+	}
+	answer := strings.TrimSpace(strings.ToLower(scanner.Text()))
+	return answer == "y" || answer == "yes"
+}
+
+func isLoopbackRemoteAddr(remoteAddr string) bool {
+	host, _, err := net.SplitHostPort(remoteAddr)
+	if err != nil {
+		host = remoteAddr
+	}
+	host = strings.Trim(host, "[]")
+
+	ip := net.ParseIP(host)
+	return ip != nil && ip.IsLoopback()
+}
+
+func setLogger(level slog.Level) {
+	fi, err := os.Stdout.Stat()
+	noColor := err != nil || (fi.Mode()&os.ModeCharDevice) == 0
+	deferlog.SetDefault(slog.New(tint.NewHandler(os.Stdout, &tint.Options{
+		AddSource: true,
+		NoColor:   noColor,
+		Level:     level,
+	})))
+}
+
+func shutdownHTTP(ctx context.Context, server *http.Server) error {
+	if err := server.Shutdown(ctx); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		return fmt.Errorf("shutdown http server: %w", err)
+	}
+	return nil
+}

cmd/sowerd/main_test.go

@@ -0,0 +1,128 @@
+package main
+
+import (
+	"errors"
+	"log/slog"
+	"path/filepath"
+	"testing"
+
+	"github.com/sower-proxy/sower/config"
+)
+
+func TestSanitizeConfig(t *testing.T) {
+	t.Parallel()
+
+	cfg := config.SowerdConfig{
+		LogLevel: slog.LevelDebug,
+		ServeIP:  "0.0.0.0",
+		Password: "secret",
+		FakeSite: "127.0.0.1:8080",
+	}
+	cfg.Cert.Email = "ops@example.com"
+	cfg.Cert.Cert = "/tmp/cert.pem"
+	cfg.Cert.Key = "/tmp/key.pem"
+
+	got := sanitizeConfig(cfg)
+	if got["fake_site"] != cfg.FakeSite {
+		t.Fatalf("unexpected fake_site: %#v", got["fake_site"])
+	}
+	if _, ok := got["password"]; ok {
+		t.Fatal("password must not be logged")
+	}
+}
+
+func TestIsLoopbackRemoteAddr(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		addr string
+		want bool
+	}{
+		{addr: "127.0.0.1:1234", want: true},
+		{addr: "[::1]:443", want: true},
+		{addr: "10.0.0.1:1234", want: false},
+		{addr: "not-an-addr", want: false},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.addr, func(t *testing.T) {
+			t.Parallel()
+			if got := isLoopbackRemoteAddr(tt.addr); got != tt.want {
+				t.Fatalf("isLoopbackRemoteAddr(%q) = %v, want %v", tt.addr, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestHasInstallFlag(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name string
+		args []string
+		want bool
+	}{
+		{name: "short flag", args: []string{"-i"}, want: true},
+		{name: "long flag", args: []string{"--install"}, want: true},
+		{name: "missing flag", args: []string{"-c", "/etc/sower/sowerd.toml"}, want: false},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			if got := hasInstallFlag(tt.args); got != tt.want {
+				t.Fatalf("hasInstallFlag(%q) = %v, want %v", tt.args, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestResolveCacheDir(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name        string
+		userCache   func() (string, error)
+		fallbackDir string
+		wantDir     string
+		wantErr     bool
+	}{
+		{
+			name: "user cache dir available",
+			userCache: func() (string, error) {
+				return "/tmp/cache", nil
+			},
+			fallbackDir: "/var/cache/sower",
+			wantDir:     filepath.Join("/tmp/cache", "sower"),
+		},
+		{
+			name: "fallback to system cache dir",
+			userCache: func() (string, error) {
+				return "", errors.New("missing home")
+			},
+			fallbackDir: "/var/cache/sower",
+			wantDir:     "/var/cache/sower",
+			wantErr:     true,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			gotDir, err := resolveCacheDir(tt.userCache, tt.fallbackDir)
+			if tt.wantErr && err == nil {
+				t.Fatal("expected error")
+			}
+			if !tt.wantErr && err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if gotDir != tt.wantDir {
+				t.Fatalf("resolveCacheDir() = %q, want %q", gotDir, tt.wantDir)
+			}
+		})
+	}
+}

conf/conf.go

@@ -1,153 +0,0 @@
-package conf
-
-import (
-	"context"
-	"flag"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strconv"
-	"sync"
-	"time"
-
-	"github.com/golang/glog"
-	toml "github.com/pelletier/go-toml"
-	"github.com/wweir/fsnotify"
-	"github.com/wweir/sower/util"
-)
-
-var Conf = struct {
-	ConfigFile string
-	NetType    string `toml:"net_type"`
-	Cipher     string `toml:"cipher"`
-	Password   string `toml:"password"`
-
-	ServerPort string `toml:"server_port"`
-	ServerAddr string `toml:"server_addr"`
-	HTTPProxy  string `toml:"http_proxy"`
-
-	DNSServer     string `toml:"dns_server"`
-	ClientIP      string `toml:"client_ip"`
-	ClearDNSCache string `toml:"clear_dns_cache"`
-
-	BlockList   []string `toml:"blocklist"`
-	WhiteList   []string `toml:"whitelist"`
-	Suggestions []string `toml:"suggestions"`
-	Verbose     int      `toml:"verbose"`
-}{}
-var mu = &sync.Mutex{}
-
-var OnRefreash = []func() error{
-	func() (err error) {
-		mu.Lock()
-		defer mu.Unlock()
-
-		f, err := os.OpenFile(Conf.ConfigFile, os.O_RDONLY, 0644)
-		if err != nil {
-			return err
-		}
-		defer f.Close()
-
-		file := Conf.ConfigFile
-		if err = toml.NewDecoder(f).Decode(&Conf); err != nil {
-			return err
-		}
-		Conf.ConfigFile = file
-
-		return flag.Set("v", strconv.Itoa(Conf.Verbose))
-	},
-	func() error {
-		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)
-			}
-		}
-		return nil
-	},
-}
-
-func init() {
-	flag.StringVar(&Conf.ConfigFile, "f", filepath.Dir(os.Args[0])+"/sower.toml", "config file location")
-	flag.StringVar(&Conf.NetType, "n", "TCP", "proxy net type (QUIC|KCP|TCP)")
-	flag.StringVar(&Conf.Cipher, "C", "AES_128_GCM", "cipher type (AES_128_GCM|AES_192_GCM|AES_256_GCM|CHACHA20_IETF_POLY1305|XCHACHA20_IETF_POLY1305)")
-	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.HTTPProxy, "H", "", "http proxy listen addr")
-	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.Set("logtostderr", "true")
-		flag.Parse()
-	}
-
-	if _, err := os.Stat(Conf.ConfigFile); os.IsNotExist(err) {
-		glog.Warningln("no config file has been load:", Conf.ConfigFile)
-		return
-	}
-	for i := range OnRefreash {
-		if err := OnRefreash[i](); err != nil {
-			glog.Fatalln(err)
-		}
-	}
-	watchConfigFile()
-}
-
-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.V(1).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)
-			}
-		}
-	}()
-}
-
-func AddSuggest(domain string) {
-	mu.Lock()
-	defer mu.Unlock()
-
-	Conf.Suggestions = append(Conf.Suggestions, domain)
-	Conf.Suggestions = util.NewReverseSecSlice(Conf.Suggestions).Sort().Uniq()
-
-	// safe write
-	f, err := os.OpenFile(Conf.ConfigFile+"~", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
-	if err != nil {
-		glog.Errorln(err)
-		return
-	}
-	defer f.Close()
-
-	if err := toml.NewEncoder(f).ArraysWithOneElementPerLine(true).Encode(Conf); err != nil {
-		glog.Errorln(err)
-		return
-	}
-
-	if err = os.Rename(Conf.ConfigFile+"~", Conf.ConfigFile); err != nil {
-		glog.Errorln(err)
-	}
-}

conf/sower.toml

@@ -1,44 +0,0 @@
-net_type="TCP"
-cipher="AES_128_GCM"
-password="12345678"
-server_port="5533"
-# server_addr="remote-server:5533" # replce it to remote server
-http_proxy=":8080"               # eg: 192.168.0.2:8080
-dns_server=""                    # Keep empty for dynamic setting from net env
-client_ip="127.0.0.1"            # listen the IP, dns target is the IP
-# clear_dns_cache="killall -HUP mDNSResponder"
-blocklist=[
-    "**.google.com", # google
-    "**.goo.gl",
-    "**.googleusercontent.com",
-    "**.googleapis.com",
-    "*.googlesource.com",
-    "**.youtube.com", # youtube
-    "**.ytimg.com",
-    "**.ggpht.com",
-    "**.googlevideo.com",
-    "**.facebook.com", # facebook
-    "**.fbcdn.net",
-    "**.twitter.com", # twitter
-    "**.twimg.com",
-    "**.blogspot.com", # blogspot
-    "**.appspot.com",
-    "**.wikipedia.org", # wikipeida
-    "*.cloudfront.net",
-    "**.amazon.com",
-    "**.amazonaws.com",
-    "*.githubusercontent.com",
-    "*.github.com",
-    "*.github.io",
-    "**.mozilla.com",
-    "**.mozilla.net",
-    "**.akadns.net",
-]
-whitelist=[
-    "iamp.*.*.*",
-    "iamp.*.*",
-    "imap-mail.outlook.com",
-    "**.qq.com",
-    "**.baidu.com",
-]
-verbose=0

config/example_load_test.go

@@ -0,0 +1,132 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/cristalhq/aconfig"
+	"github.com/cristalhq/aconfig/aconfigtoml"
+	"github.com/cristalhq/aconfig/aconfigyaml"
+)
+
+func TestLoadExampleSowerConfigFiles(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name string
+		file string
+	}{
+		{name: "toml", file: "sower.toml"},
+		{name: "yaml", file: "sower.yaml"},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			var cfg SowerConfig
+			if err := loadConfigFileForTest(tt.file, &cfg); err != nil {
+				t.Fatalf("load config file: %v", err)
+			}
+			if err := cfg.Validate(); err != nil {
+				t.Fatalf("validate config: %v", err)
+			}
+			if cfg.Remote.TLS.ServerName != "" {
+				t.Fatalf("unexpected remote tls server name: %q", cfg.Remote.TLS.ServerName)
+			}
+			if cfg.DNS.Serve != "127.0.0.1" {
+				t.Fatalf("unexpected dns serve: %q", cfg.DNS.Serve)
+			}
+			if cfg.DNS.ServeIface != "" {
+				t.Fatalf("unexpected dns serve iface: %q", cfg.DNS.ServeIface)
+			}
+			if cfg.Socks5.Addr != "127.0.0.1:1080" {
+				t.Fatalf("unexpected socks5 addr: %q", cfg.Socks5.Addr)
+			}
+			if cfg.Router.Block.FilePrefix != "**." {
+				t.Fatalf("unexpected block file prefix: %q", cfg.Router.Block.FilePrefix)
+			}
+		})
+	}
+}
+
+func TestLoadExampleSowerdConfigFiles(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name    string
+		content string
+		ext     string
+	}{
+		{
+			name: "toml",
+			content: strings.ReplaceAll(
+				ExampleSowerdConfigTOML,
+				`fake_site = "/var/www"            # Fake site directory or address (default: /var/www)`,
+				`fake_site = "127.0.0.1:80"       # Fake site address for tests`,
+			),
+			ext: ".toml",
+		},
+		{
+			name: "yaml",
+			content: strings.ReplaceAll(
+				mustReadFileForTest(t, "sowerd.yaml"),
+				`fake_site: "/var/www" # Fake site directory or address (default: /var/www)`,
+				`fake_site: "127.0.0.1:80" # Fake site address for tests`,
+			),
+			ext: ".yaml",
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			path := filepath.Join(t.TempDir(), "sowerd"+tt.ext)
+			if err := os.WriteFile(path, []byte(tt.content), 0o644); err != nil {
+				t.Fatalf("write temp config: %v", err)
+			}
+
+			var cfg SowerdConfig
+			if err := loadConfigFileForTest(path, &cfg); err != nil {
+				t.Fatalf("load config file: %v", err)
+			}
+			if err := cfg.Validate(); err != nil {
+				t.Fatalf("validate config: %v", err)
+			}
+			if cfg.ServeIP != "0.0.0.0" {
+				t.Fatalf("unexpected serve ip: %q", cfg.ServeIP)
+			}
+			if cfg.FakeSite != "127.0.0.1:80" {
+				t.Fatalf("unexpected fake site: %q", cfg.FakeSite)
+			}
+		})
+	}
+}
+
+func loadConfigFileForTest(path string, dst any) error {
+	return aconfig.LoaderFor(dst, aconfig.Config{
+		SkipEnv:            true,
+		SkipFlags:          true,
+		AllowUnknownFields: false,
+		Files:              []string{path},
+		FileDecoders: map[string]aconfig.FileDecoder{
+			".yaml": aconfigyaml.New(),
+			".toml": aconfigtoml.New(),
+		},
+	}).Load()
+}
+
+func mustReadFileForTest(t *testing.T, path string) string {
+	t.Helper()
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read file %s: %v", path, err)
+	}
+	return string(data)
+}

config/sower.go

@@ -0,0 +1,198 @@
+package config
+
+import (
+	"fmt"
+	"log/slog"
+	"net"
+	"strings"
+
+	"github.com/sower-proxy/sower/pkg/upstreamtls"
+)
+
+type RemoteTLSConfig struct {
+	ServerName         string `usage:"override upstream TLS server name (SNI)"`
+	ClientHello        string `usage:"uTLS client hello: chrome, firefox, ios, android, edge, safari, 360, qq, randomized, randomized_alpn, randomized_no_alpn, golang"`
+	InsecureSkipVerify bool   `default:"false" usage:"skip upstream TLS certificate verification"`
+}
+
+type RemoteConfig struct {
+	Type     string          `default:"sower" required:"true" usage:"option: sower/trojan/socks5"`
+	Addr     string          `required:"true" usage:"proxy address, eg: proxy.com or proxy.com:443"`
+	Password string          `usage:"remote proxy password"`
+	TLS      RemoteTLSConfig `flag:"tls"`
+}
+
+// SowerConfig represents the configuration for sower client
+type SowerConfig struct {
+	LogLevel slog.Level `default:"info" usage:"log level: debug, info, warn, error"`
+
+	Remote RemoteConfig
+
+	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"`
+		Upstream   string `usage:"upstream dns server"`
+		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'"`
+			FileSkipRules []string `usage:"rules to skip when loading block list file"`
+			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'"`
+			FileSkipRules []string `usage:"rules to skip when loading direct list file"`
+			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'"`
+			FileSkipRules []string `usage:"rules to skip when loading proxy list file"`
+			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"`
+		}
+	}
+}
+
+// Validate implements the validation interface for SowerConfig
+func (c *SowerConfig) Validate() error {
+	switch c.Remote.Type {
+	case "sower", "trojan", "socks5":
+	default:
+		return fmt.Errorf("unsupported remote type %q", c.Remote.Type)
+	}
+
+	remoteHost, err := validateRemoteAddr(c.Remote.Type, c.Remote.Addr)
+	if err != nil {
+		return err
+	}
+	if c.Remote.TLS.ClientHello != "" {
+		if err := upstreamtls.ValidateClientHello(c.Remote.TLS.ClientHello); err != nil {
+			return err
+		}
+	}
+
+	if c.DNS.ServeIface != "" {
+		iface, err := net.InterfaceByName(c.DNS.ServeIface)
+		if err != nil {
+			return fmt.Errorf("get interface: %w", err)
+		}
+		addrs, err := iface.Addrs()
+		if err != nil {
+			return fmt.Errorf("get interface addresses: %w", err)
+		}
+		for _, addr := range addrs {
+			ip, _, err := net.ParseCIDR(addr.String())
+			if err != nil {
+				return fmt.Errorf("parse interface IP: %w", err)
+			}
+
+			if ip.To4() != nil { // ipv4
+				if c.DNS.Serve == "" {
+					c.DNS.Serve = ip.String()
+				}
+			} else if ip.IsGlobalUnicast() { // ipv6 must be global unicast
+				if c.DNS.Serve6 == "" {
+					c.DNS.Serve6 = ip.String()
+				}
+			}
+		}
+	}
+
+	if err := validateOptionalIP("dns serve", c.DNS.Serve); err != nil {
+		return err
+	}
+	if err := validateOptionalIP("dns serve6", c.DNS.Serve6); err != nil {
+		return err
+	}
+	if err := validateOptionalIP("dns upstream", c.DNS.Upstream); err != nil {
+		return err
+	}
+	if err := validateRequiredIP("dns fallback", c.DNS.Fallback); err != nil {
+		return err
+	}
+
+	if !c.DNS.Disable && c.DNS.Serve == "" {
+		return fmt.Errorf("dns serve ip and serve interface not set")
+	}
+	if !c.Socks5.Disable {
+		if _, _, err := net.SplitHostPort(c.Socks5.Addr); err != nil {
+			return fmt.Errorf("invalid socks5 listen address %q: %w", c.Socks5.Addr, err)
+		}
+	}
+
+	c.Router.Direct.Rules = append(c.Router.Direct.Rules,
+		remoteHost, "**.in-addr.arpa", "**.ip6.arpa")
+
+	return nil
+}
+
+func validateRemoteAddr(remoteType, addr string) (string, error) {
+	switch remoteType {
+	case "socks5":
+		host, _, err := net.SplitHostPort(addr)
+		if err != nil {
+			return "", fmt.Errorf("invalid remote socks5 address %q: %w", addr, err)
+		}
+		if host == "" {
+			return "", fmt.Errorf("invalid remote socks5 address %q", addr)
+		}
+		return host, nil
+	default:
+		host, _, err := splitRemoteAddr(addr, "443")
+		if err != nil {
+			return "", fmt.Errorf("invalid remote tls address %q: %w", addr, err)
+		}
+		return host, nil
+	}
+}
+
+func splitRemoteAddr(addr, defaultPort string) (string, string, error) {
+	if addr == "" {
+		return "", "", fmt.Errorf("empty address")
+	}
+	if host, port, err := net.SplitHostPort(addr); err == nil {
+		if host == "" || port == "" {
+			return "", "", fmt.Errorf("invalid address %q", addr)
+		}
+		return host, port, nil
+	}
+
+	if strings.HasPrefix(addr, "[") || strings.HasSuffix(addr, "]") {
+		return "", "", fmt.Errorf("invalid address %q", addr)
+	}
+	if strings.Count(addr, ":") == 1 {
+		return "", "", fmt.Errorf("missing or invalid port in %q", addr)
+	}
+	return addr, defaultPort, nil
+}
+
+func validateOptionalIP(name, value string) error {
+	if value == "" {
+		return nil
+	}
+	return validateRequiredIP(name, value)
+}
+
+func validateRequiredIP(name, value string) error {
+	if net.ParseIP(value) == nil {
+		return fmt.Errorf("invalid %s %q", name, value)
+	}
+	return nil
+}

config/sower.toml

@@ -0,0 +1,61 @@
+# Sower configuration example (TOML format)
+# This is the client configuration for the sower proxy
+
+# Logging configuration
+log_level = "info" # Log level: debug, info, warn, error
+
+# Remote proxy configuration
+[remote]
+type = "sower"                    # Proxy type: sower, trojan, or socks5
+addr = "proxy.example.com"        # Proxy server address, optional port for TLS remotes
+password = "your_secure_password" # Proxy password
+
+[remote.tls]
+server_name = ""            # Override upstream TLS server name (SNI)
+client_hello = ""           # Optional uTLS fingerprint: chrome, firefox, ios, android, edge, safari, 360, qq, randomized, randomized_alpn, randomized_no_alpn, golang
+insecure_skip_verify = false # Skip upstream TLS certificate verification
+
+# DNS configuration
+[dns]
+disable = false        # Disable DNS proxy
+serve = "127.0.0.1"    # DNS server IP address
+serve_6 = ""           # DNS server IPv6 address (optional); aconfig maps Serve6 -> serve_6
+serve_iface = ""       # Network interface to get IP from (optional)
+upstream = "8.8.8.8"   # Upstream DNS server (optional)
+fallback = "223.5.5.5" # Fallback DNS server
+
+# SOCKS5 proxy configuration
+# aconfig maps Socks5 -> socks_5 for file keys.
+[socks_5]
+disable = false         # Disable SOCKS5 proxy
+addr = "127.0.0.1:1080" # SOCKS5 listen address
+
+# Router configuration
+[router]
+# Block list rules
+[router.block]
+file = ""              # Block list file path (local or remote)
+file_prefix = "**."    # Prefix for block list rules
+file_skip_rules = []   # Rules to skip when loading the block list file
+rules = []             # Additional block rules
+
+# Direct list rules
+[router.direct]
+file = ""              # Direct list file path (local or remote)
+file_prefix = "**."    # Prefix for direct list rules
+file_skip_rules = []   # Rules to skip when loading the direct list file
+rules = []             # Additional direct rules
+
+# Proxy list rules
+[router.proxy]
+file = ""              # Proxy list file path (local or remote)
+file_prefix = "**."    # Prefix for proxy list rules
+file_skip_rules = []   # Rules to skip when loading the proxy list file
+rules = []             # Additional proxy rules
+
+# Country-based routing
+[router.country]
+mmdb = ""        # Optional MMDB file path for GeoIP; empty disables GeoIP lookup
+file = ""        # CIDR block list file path
+file_prefix = "" # Prefix for CIDR rules
+rules = []       # Additional CIDR rules

config/sower.yaml

@@ -0,0 +1,59 @@
+# Sower configuration example (YAML format)
+# This is the client configuration for the sower proxy
+
+# Logging configuration
+log_level: "info" # Log level: debug, info, warn, error
+
+# Remote proxy configuration
+remote:
+  type: "sower" # Proxy type: sower, trojan, or socks5
+  addr: "proxy.example.com" # Proxy server address, optional port for TLS remotes
+  password: "your_secure_password" # Proxy password
+  tls:
+    server_name: "" # Override upstream TLS server name (SNI)
+    client_hello: "" # Optional uTLS fingerprint: chrome, firefox, ios, android, edge, safari, 360, qq, randomized, randomized_alpn, randomized_no_alpn, golang
+    insecure_skip_verify: false # Skip upstream TLS certificate verification
+
+# DNS configuration
+dns:
+  disable: false # Disable DNS proxy
+  serve: "127.0.0.1" # DNS server IP address
+  serve_6: "" # DNS server IPv6 address (optional)
+  serve_iface: "" # Network interface to get IP from (optional)
+  upstream: "8.8.8.8" # Upstream DNS server (optional)
+  fallback: "223.5.5.5" # Fallback DNS server
+
+# SOCKS5 proxy configuration
+socks_5:
+  disable: false # Disable SOCKS5 proxy
+  addr: "127.0.0.1:1080" # SOCKS5 listen address
+
+# Router configuration
+router:
+  # Block list rules
+  block:
+    file: "" # Block list file path (local or remote)
+    file_prefix: "**." # Prefix for block list rules
+    file_skip_rules: [] # Rules to skip when loading the block list file
+    rules: [] # Additional block rules
+
+  # Direct list rules
+  direct:
+    file: "" # Direct list file path (local or remote)
+    file_prefix: "**." # Prefix for direct list rules
+    file_skip_rules: [] # Rules to skip when loading the direct list file
+    rules: [] # Additional direct rules
+
+  # Proxy list rules
+  proxy:
+    file: "" # Proxy list file path (local or remote)
+    file_prefix: "**." # Prefix for proxy list rules
+    file_skip_rules: [] # Rules to skip when loading the proxy list file
+    rules: [] # Additional proxy rules
+
+  # Country-based routing
+  country:
+    mmdb: "" # Optional MMDB file path for GeoIP; empty disables GeoIP lookup
+    file: "" # CIDR block list file path
+    file_prefix: "" # Prefix for CIDR rules
+    rules: [] # Additional CIDR rules

config/sower_test.go

@@ -0,0 +1,160 @@
+package config
+
+import (
+	"os"
+	"testing"
+
+	"github.com/cristalhq/aconfig"
+	"github.com/cristalhq/aconfig/aconfigtoml"
+	"github.com/cristalhq/aconfig/aconfigyaml"
+)
+
+func TestSowerConfigValidateRejectsInvalidRemoteType(t *testing.T) {
+	t.Parallel()
+
+	cfg := SowerConfig{}
+	cfg.Remote.Type = "invalid"
+	cfg.Remote.Addr = "example.com"
+	cfg.DNS.Disable = true
+
+	if err := cfg.Validate(); err == nil {
+		t.Fatal("expected validation error for invalid remote type")
+	}
+}
+
+func TestSowerConfigValidateRejectsInvalidSocks5Addr(t *testing.T) {
+	t.Parallel()
+
+	cfg := SowerConfig{}
+	cfg.Remote.Type = "sower"
+	cfg.Remote.Addr = "example.com"
+	cfg.DNS.Disable = true
+	cfg.Socks5.Addr = "127.0.0.1"
+
+	if err := cfg.Validate(); err == nil {
+		t.Fatal("expected validation error for invalid socks5 address")
+	}
+}
+
+func TestSowerConfigValidateRejectsInvalidFallbackIP(t *testing.T) {
+	t.Parallel()
+
+	cfg := SowerConfig{}
+	cfg.Remote.Type = "sower"
+	cfg.Remote.Addr = "example.com"
+	cfg.DNS.Disable = true
+	cfg.DNS.Fallback = "not-an-ip"
+
+	if err := cfg.Validate(); err == nil {
+		t.Fatal("expected validation error for invalid fallback IP")
+	}
+}
+
+func TestSowerConfigValidateAllowsTLSRemoteWithExplicitPort(t *testing.T) {
+	t.Parallel()
+
+	cfg := SowerConfig{}
+	cfg.Remote.Type = "sower"
+	cfg.Remote.Addr = "example.com:8443"
+	cfg.Remote.TLS.ClientHello = "chrome"
+	cfg.DNS.Disable = true
+	cfg.DNS.Fallback = "223.5.5.5"
+	cfg.Socks5.Disable = true
+
+	if err := cfg.Validate(); err != nil {
+		t.Fatalf("validate config: %v", err)
+	}
+	if got := cfg.Router.Direct.Rules[len(cfg.Router.Direct.Rules)-3]; got != "example.com" {
+		t.Fatalf("unexpected direct rule host: %q", got)
+	}
+}
+
+func TestSowerConfigValidateRejectsInvalidTLSClientHello(t *testing.T) {
+	t.Parallel()
+
+	cfg := SowerConfig{}
+	cfg.Remote.Type = "trojan"
+	cfg.Remote.Addr = "example.com"
+	cfg.Remote.TLS.ClientHello = "not-supported"
+	cfg.DNS.Disable = true
+	cfg.DNS.Fallback = "223.5.5.5"
+	cfg.Socks5.Disable = true
+
+	if err := cfg.Validate(); err == nil {
+		t.Fatal("expected validation error for invalid TLS client hello")
+	}
+}
+
+func TestSowerConfigLoadsTOMLFileSkipRules(t *testing.T) {
+	t.Parallel()
+
+	path := t.TempDir() + "/sower.toml"
+	if err := os.WriteFile(path, []byte(`
+[remote]
+type = "sower"
+addr = "example.com"
+
+[dns]
+disable = true
+fallback = "223.5.5.5"
+
+[socks_5]
+disable = true
+
+[router.block]
+file_skip_rules = ["t.co"]
+`), 0o600); err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	var cfg SowerConfig
+	if err := aconfig.LoaderFor(&cfg, aconfig.Config{
+		SkipEnv:   true,
+		SkipFlags: true,
+		Files:     []string{path},
+		FileDecoders: map[string]aconfig.FileDecoder{
+			".toml": aconfigtoml.New(),
+		},
+	}).Load(); err != nil {
+		t.Fatalf("load config: %v", err)
+	}
+
+	if len(cfg.Router.Block.FileSkipRules) != 1 || cfg.Router.Block.FileSkipRules[0] != "t.co" {
+		t.Fatalf("unexpected file skip rules: %v", cfg.Router.Block.FileSkipRules)
+	}
+	if !cfg.Socks5.Disable {
+		t.Fatal("expected socks_5 section to load")
+	}
+}
+
+func TestSowerConfigLoadsPackagedExamples(t *testing.T) {
+	t.Parallel()
+
+	for _, path := range []string{
+		"../config/sower.toml",
+		"../config/sower.yaml",
+		"../.github/sower.toml",
+		"../.github/sower.yaml",
+	} {
+		path := path
+		t.Run(path, func(t *testing.T) {
+			t.Parallel()
+
+			var cfg SowerConfig
+			if err := aconfig.LoaderFor(&cfg, aconfig.Config{
+				SkipEnv:   true,
+				SkipFlags: true,
+				Files:     []string{path},
+				FileDecoders: map[string]aconfig.FileDecoder{
+					".toml": aconfigtoml.New(),
+					".yaml": aconfigyaml.New(),
+				},
+			}).Load(); err != nil {
+				t.Fatalf("load config: %v", err)
+			}
+			if err := cfg.Validate(); err != nil {
+				t.Fatalf("validate config: %v", err)
+			}
+		})
+	}
+}

config/sowerd.go

@@ -0,0 +1,78 @@
+package config
+
+import (
+	"fmt"
+	"log/slog"
+	"net"
+	"os"
+)
+
+const ExampleSowerdConfigTOML = `# Sowerd configuration example (TOML format)
+# This is the daemon configuration for the sower server
+
+# Logging configuration
+log_level = "info" # Log level: debug, info, warn, error
+
+# Server configuration
+serve_ip = "0.0.0.0"              # IP address to listen on for ports 80 and 443
+password = "change_me"            # Password for client authentication
+fake_site = "/var/www"            # Fake site directory or address (default: /var/www)
+
+# SSL/TLS certificate configuration
+[cert]
+email = "your-email@example.com" # Email for Let's Encrypt certificate
+cert = ""                        # Path to custom certificate file (optional)
+key = ""                         # Path to custom private key file (optional)
+`
+
+// SowerdConfig represents the configuration for sowerd daemon
+type SowerdConfig struct {
+	LogLevel slog.Level `default:"info" usage:"log level: debug, info, warn, error"`
+	ServeIP  string     `usage:"listen to port 80 443 of the IP"`
+	Password string     `required:"true"`
+	FakeSite string     `default:"/var/www" usage:"fake site address or directoy. serving on 127.0.0.1:80 if directory"`
+
+	Cert struct {
+		Email string
+		Cert  string
+		Key   string
+	}
+}
+
+// Validate implements the validation interface for SowerdConfig
+func (c *SowerdConfig) Validate() error {
+	if c.ServeIP != "" && net.ParseIP(c.ServeIP) == nil {
+		return fmt.Errorf("invalid serve ip: %q", c.ServeIP)
+	}
+	if c.Password == "" {
+		return fmt.Errorf("password is required")
+	}
+	if c.FakeSite == "" {
+		return fmt.Errorf("fake site is required")
+	}
+
+	if (c.Cert.Cert == "") != (c.Cert.Key == "") {
+		return fmt.Errorf("cert and key must be configured together")
+	}
+
+	if c.Cert.Cert != "" {
+		if _, err := os.Stat(c.Cert.Cert); err != nil {
+			return fmt.Errorf("stat cert file: %w", err)
+		}
+		if _, err := os.Stat(c.Cert.Key); err != nil {
+			return fmt.Errorf("stat key file: %w", err)
+		}
+	}
+
+	if _, err := os.Stat(c.FakeSite); err == nil {
+		return nil
+	} else if !os.IsNotExist(err) {
+		return fmt.Errorf("stat fake site: %w", err)
+	}
+
+	if _, _, err := net.SplitHostPort(c.FakeSite); err != nil {
+		return fmt.Errorf("fake site must be an existing directory or host:port: %w", err)
+	}
+
+	return nil
+}

config/sowerd.toml

@@ -0,0 +1,16 @@
+# Sowerd configuration example (TOML format)
+# This is the daemon configuration for the sower server
+
+# Logging configuration
+log_level = "info" # Log level: debug, info, warn, error
+
+# Server configuration
+serve_ip = "0.0.0.0"              # IP address to listen on for ports 80 and 443
+password = "change_me"            # Password for client authentication
+fake_site = "/var/www"            # Fake site directory or address (default: /var/www)
+
+# SSL/TLS certificate configuration
+[cert]
+email = "your-email@example.com" # Email for Let's Encrypt certificate
+cert = ""                        # Path to custom certificate file (optional)
+key = ""                         # Path to custom private key file (optional)

config/sowerd.yaml

@@ -0,0 +1,16 @@
+# Sowerd configuration example (YAML format)
+# This is the daemon configuration for the sower server
+
+# Logging configuration
+log_level: "info" # Log level: debug, info, warn, error
+
+# Server configuration
+serve_ip: "0.0.0.0" # IP address to listen on for ports 80 and 443
+password: "change_me" # Password for client authentication
+fake_site: "/var/www" # Fake site directory or address (default: /var/www)
+
+# SSL/TLS certificate configuration
+cert:
+  email: "your-email@example.com" # Email for Let's Encrypt certificate
+  cert: "" # Path to custom certificate file (optional)
+  key: "" # Path to custom private key file (optional)

config/sowerd_test.go

@@ -0,0 +1,76 @@
+package config
+
+import "testing"
+
+func TestSowerdConfigValidate(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name    string
+		cfg     SowerdConfig
+		wantErr bool
+	}{
+		{
+			name: "valid remote fake site",
+			cfg: SowerdConfig{
+				ServeIP:  "0.0.0.0",
+				Password: "secret",
+				FakeSite: "127.0.0.1:8080",
+			},
+		},
+		{
+			name: "invalid serve ip",
+			cfg: SowerdConfig{
+				ServeIP:  "bad-ip",
+				Password: "secret",
+				FakeSite: "127.0.0.1:8080",
+			},
+			wantErr: true,
+		},
+		{
+			name: "missing password",
+			cfg: SowerdConfig{
+				FakeSite: "127.0.0.1:8080",
+			},
+			wantErr: true,
+		},
+		{
+			name: "invalid fake site address",
+			cfg: SowerdConfig{
+				Password: "secret",
+				FakeSite: "not-an-address",
+			},
+			wantErr: true,
+		},
+		{
+			name: "partial cert config",
+			cfg: SowerdConfig{
+				Password: "secret",
+				FakeSite: "127.0.0.1:8080",
+				Cert: struct {
+					Email string
+					Cert  string
+					Key   string
+				}{
+					Cert: "/tmp/cert.pem",
+				},
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			err := tt.cfg.Validate()
+			if tt.wantErr && err == nil {
+				t.Fatal("expected error")
+			}
+			if !tt.wantErr && err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+		})
+	}
+}

deploy/Dockerfile

@@ -1,18 +0,0 @@
-# Compile
-FROM golang:1.11-alpine AS compiler
-
-RUN apk add --no-cache git make
-
-# enable go modules
-WORKDIR /go-mod
-COPY . .
-
-# do not worry about downloading dependency, sower will fix this.
-RUN CGO_ENABLED=0 make build
-
-
-# Build image
-FROM scratch
-
-COPY --from=compiler /go-mod/sower /sower
-ENTRYPOINT [ "/sower" ]

deploy/cc.wweir.sower.plist

@@ -1,18 +0,0 @@
-<?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>cc.wweir.sower</string>
-  <key>ProgramArguments</key>
-  <array>
-	  <string>/usr/local/bin/sower</string>
-    <string>-f</string>
-    <string>/usr/local/etc/sower.toml</string>
-  </array>
-  <key>KeepAlive</key>
-  <true/>
-  <key>RunAtLoad</key>
-  <true/>
-</dict>
-</plist>

deploy/install

@@ -1,92 +0,0 @@
-#!/usr/bin/env bash
-set -u -e
-[[ -d /tmp/sower ]] || mkdir /tmp/sower
-cd /tmp/sower
-
-echo ========    Install sower to your system    ========
-succ_message(){
-	echo
-	echo ========    Installed sower to your system    ========
-	echo The config file is: /usr/local/etc/sower.toml
-	echo please set 127.0.0.1 as the first domain name server manually.
-}
-
-# main logic
-VERSION="$(curl -s "https://api.github.com/repos/wweir/sower/releases/latest" | awk -F '"'  '/tag_name/{printf $4}')"
-case "$(uname -s)" in
-	"Darwin")
-		printf "Please enter remote server adddress: "
-		read ADDRESS
-		echo
-
-		curl -SLf https://github.com/wweir/sower/releases/download/$VERSION/sower_darwin_amd64.tar.gz | tar xzv
-
-		mv sower /usr/local/bin/
-
-		if [[ -r /usr/local/etc/sower.toml ]]; then
-			echo The config file already exists, keep the original file
-		else
-			sed -i~ "s/# server_addr=\"remote-server/server_addr=\"$ADDRESS/" sower.toml
-			sed -i~ "s/# clear_dns_cache/clear_dns_cache/" sower.toml
-			mv sower.toml /usr/local/etc/
-		fi
-
-		echo
-		echo Register auto start service, root privilege is needed!
-		echo
-		sudo mv cc.wweir.sower.plist /Library/LaunchDaemons/
-		sudo chown root:wheel /Library/LaunchDaemons/cc.wweir.sower.plist
-		sudo launchctl load -w /Library/LaunchDaemons/cc.wweir.sower.plist
-		succ_message
-		;;
-
-	"Linux")
-		if [[ "$(cat /proc/1/comm)" != "systemd" ]]; then
-			echo do not support auto deploy on SysVinit
-			exit 1
-		fi
-		printf "Server side or client side, which do you wanna install [c/s]: "
-		read SIDE
-		echo
-
-		case "$SIDE" in
-			"c")
-				printf "Please enter remote server adddress: "
-				read ADDRESS
-				echo
-
-				curl -SLf https://github.com/wweir/sower/releases/download/$VERSION/sower_linux_amd64.tar.gz | tar xzv
-
-				sudo mv sower /usr/local/bin/
-
-				if [[ -r /usr/local/etc/sower.toml ]]; then
-					echo The config file already exists, keep the original file
-				else
-					sed -i~ "s/# server_addr=\"remote-server/server_addr=\"$ADDRESS/" sower.toml
-					sudo mv sower.toml /usr/local/etc/
-				fi
-
-				sudo mv sower-client.service /etc/systemd/system/
-				sudo systemctl enable sower-client
-				sudo systemctl start sower-client
-				succ_message
-				;;
-
-			"s")
-				curl -SLf https://github.com/wweir/sower/releases/download/$VERSION/sower_linux_amd64.tar.gz | tar xzv
-
-				sudo mv sower /usr/local/bin/
-				sudo mv sower-server.service /etc/systemd/system/
-				sudo systemctl enable sower-server
-				sudo systemctl start sower-server
-				;;
-
-			*)
-				echo "invalid: $SIDE" && exit 1
-				;;
-		esac
-		;;
-	*)
-		echo Do not support auto deploy on this platform.
-		;;
-esac

deploy/sower-client.service

@@ -1,14 +0,0 @@
-[Unit]
-Description=Sower client service
-After=network.target
-
-[Install]
-WantedBy=multi-user.target
-
-[Service]
-Type=simple
-User=root
-WorkingDirectory=/tmp
-ExecStart=/usr/local/bin/sower -f /usr/local/etc/sower.toml
-RestartSec=3
-Restart=on-failure

deploy/sower-server.service

@@ -1,14 +0,0 @@
-[Unit]
-Description=Sower server service
-After=network.target
-
-[Install]
-WantedBy=multi-user.target
-
-[Service]
-Type=simple
-User=nobody
-WorkingDirectory=/tmp
-ExecStart=/usr/local/bin/sower -n TCP -v 1
-RestartSec=3
-Restart=on-failure

deploy/uninstall

@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-set -u -x -e
-
-# main logic
-case "$(uname -s)" in
-	"Darwin")
-		sudo launchctl unload /Library/LaunchDaemons/cc.wweir.sower.plist
-		sudo rm -rf /Library/LaunchDaemons/cc.wweir.sower.plist
-		rm -rf /usr/local/bin/sower /usr/local/etc/sower.toml
-		;;
-	"Linux")
-		sudo systemctl disable sower-client ||true
-		sudo systemctl disable sower-server || true
-		sudo rm -rf /etc/systemd/system/sower-client.service /etc/systemd/system/sower-server.service
-		sudo rm -rf /usr/local/bin/sower /usr/local/etc/sower.toml
-		;;
-	*)
-		echo Do not support auto deploy on this platform.
-		;;
-esac

dns/dns.go

@@ -1,153 +0,0 @@
-package dns
-
-import (
-	"net"
-	"strings"
-	"sync/atomic"
-	"time"
-
-	"github.com/golang/glog"
-	"github.com/miekg/dns"
-	mem "github.com/wweir/mem-go"
-	"github.com/wweir/sower/conf"
-	"github.com/wweir/sower/util"
-)
-
-const colon = byte(':')
-
-func StartDNS(dnsServer, listenIP string) {
-	ip := net.ParseIP(listenIP)
-
-	suggest := &intelliSuggest{listenIP, time.Second}
-	mem.DefaultCache = mem.New(time.Hour)
-
-	dhcpCh := make(chan struct{})
-	if dnsServer != "" {
-		dnsServer = net.JoinHostPort(dnsServer, "53")
-	} else {
-		go func() {
-			for {
-				<-dhcpCh
-				host := util.GetDefaultDNSServer()
-				if host == "" {
-					continue
-				}
-				// atomic action
-				dnsServer = net.JoinHostPort(host, "53")
-				glog.Infoln("set dns server to", host)
-			}
-		}()
-		dhcpCh <- struct{}{}
-	}
-
-	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 {
-			lastTsig := r.Extra[len(r.Extra)-1].(*dns.TSIG)
-			r.SetTsig(lastTsig.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]
-		}
-
-		matchAndServe(w, r, domain, listenIP, dnsServer, dhcpCh, ip, suggest)
-	})
-
-	server := &dns.Server{Addr: net.JoinHostPort(listenIP, "53"), Net: "udp"}
-	glog.Fatalln(server.ListenAndServe())
-}
-
-func matchAndServe(w dns.ResponseWriter, r *dns.Msg, domain, listenIP, dnsServer string,
-	dhcpCh chan struct{}, ipNet net.IP, suggest *intelliSuggest) {
-
-	inWriteList := whiteList.Match(domain)
-
-	if !inWriteList && (blockList.Match(domain) || suggestList.Match(domain)) {
-		glog.V(2).Infof("match %s suss", domain)
-		w.WriteMsg(localA(r, domain, ipNet))
-		return
-	}
-
-	if !inWriteList {
-		go mem.Remember(suggest, domain)
-	}
-
-	msg, err := dns.Exchange(r, dnsServer)
-	if err != nil && dhcpCh != nil {
-		select {
-		case dhcpCh <- struct{}{}:
-		default:
-		}
-	}
-	if msg == nil { // expose any response except nil
-		glog.V(1).Infof("get dns of %s fail: %s", domain, err)
-		return
-	}
-	w.WriteMsg(msg)
-}
-
-type intelliSuggest struct {
-	listenIP string
-	timeout  time.Duration
-}
-
-func (i *intelliSuggest) GetOne(domain interface{}) (iface interface{}, e error) {
-	iface, e = struct{}{}, nil
-
-	// kill deadloop, for ugly wildcard setting dns setting
-	addr := strings.TrimSuffix(domain.(string), ".")
-	if len(strings.Split(addr, ".")) > 10 {
-		return
-	}
-
-	// give local dial a hand, make it not so easy to be added into suggestions
-	util.HTTPPing(addr, addr, util.Http, i.timeout/50)
-
-	var (
-		pings = []struct {
-			viaAddr string
-			port    util.Port
-		}{
-			{addr, util.Http},
-			{addr, util.Https},
-			{i.listenIP, util.Http},
-			{i.listenIP, util.Https},
-		}
-		half  = int32(len(pings) / 2)
-		score = new(int32)
-	)
-	for idx := range pings {
-		go func(idx int) {
-			err := util.HTTPPing(pings[idx].viaAddr, addr, pings[idx].port, i.timeout)
-			if err != nil {
-				// local ping fail
-				if pings[idx].viaAddr == addr {
-					atomic.AddInt32(score, 1)
-				}
-			} else {
-				// remote ping succ
-				if pings[idx].viaAddr == i.listenIP {
-					atomic.AddInt32(score, 1)
-
-					// local ping took longger than remote
-				} else if atomic.LoadInt32(score) >= half {
-					atomic.AddInt32(score, 1)
-				}
-			}
-
-			if atomic.LoadInt32(score) > half {
-				atomic.StoreInt32(score, 0) // avoid redo add action
-				conf.AddSuggest(addr)
-				glog.Infof("added suggest domain: %s", addr)
-			}
-		}(idx)
-	}
-	return
-}

dns/util.go

@@ -1,57 +0,0 @@
-package dns
-
-import (
-	"net"
-
-	"github.com/golang/glog"
-	"github.com/miekg/dns"
-	"github.com/wweir/sower/conf"
-	"github.com/wweir/sower/util"
-)
-
-var (
-	blockList   *util.Node
-	whiteList   *util.Node
-	suggestList *util.Node
-)
-
-func init() {
-	host, _, _ := net.SplitHostPort(conf.Conf.ServerAddr)
-
-	//first init
-	blockList = loadRules("block", conf.Conf.BlockList)
-	suggestList = loadRules("suggest", conf.Conf.Suggestions)
-	whiteList = loadRules("white", conf.Conf.WhiteList)
-	whiteList.Add(host)
-
-	conf.OnRefreash = append(conf.OnRefreash, func() error {
-		blockList = loadRules("block", conf.Conf.BlockList)
-		suggestList = loadRules("suggest", conf.Conf.Suggestions)
-		whiteList = loadRules("white", conf.Conf.WhiteList)
-		whiteList.Add(host)
-		return nil
-	})
-}
-
-func loadRules(name string, list []string) *util.Node {
-	rule := util.NewNodeFromRules(".", list...)
-	glog.V(3).Infof("load %s rule:\n%s", name, rule)
-	return rule
-}
-
-func localA(r *dns.Msg, domain string, localIP net.IP) *dns.Msg {
-	m := new(dns.Msg)
-	m.SetReply(r)
-	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
-}

go.mod

@@ -1,27 +1,34 @@
-module github.com/wweir/sower
+module github.com/sower-proxy/sower
+
+go 1.26.1
 
 require (
-	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/hashicorp/golang-lru v0.5.0 // indirect
-	github.com/klauspost/cpuid v1.2.0 // indirect
-	github.com/klauspost/reedsolomon v1.9.0 // indirect
-	github.com/lucas-clemente/aes12 v0.0.0-20171027163421-cd47fb39b79f // indirect
-	github.com/lucas-clemente/quic-go v0.10.1
-	github.com/lucas-clemente/quic-go-certificates v0.0.0-20160823095156-d2f86524cced // indirect
-	github.com/miekg/dns v1.1.4
-	github.com/pelletier/go-toml v1.2.0
-	github.com/pkg/errors v0.8.1
-	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/ulule/deepcopier v0.0.0-20171107155558-ca99b135e50f // indirect
-	github.com/wweir/fsnotify v1.4.8
-	github.com/wweir/mem-go v0.0.0-20190109100331-8673ab596296
-	github.com/wweir/netboot v0.0.2
-	github.com/xtaci/kcp-go v5.0.7+incompatible
-	golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67
-	golang.org/x/net v0.0.0-20190213061140-3a22650c66bd // indirect
-	golang.org/x/sys v0.0.0-20190213121743-983097b1a8a3 // indirect
+	github.com/cristalhq/aconfig v0.19.0
+	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/lmittmann/tint v1.1.3
+	github.com/miekg/dns v1.1.72
+	github.com/oschwald/geoip2-golang v1.13.0
+	github.com/refraction-networking/utls v1.8.2
+	github.com/sower-proxy/conns v0.1.1
+	github.com/sower-proxy/deferlog/v2 v2.1.4
+	github.com/sower-proxy/mem v0.0.3
+	golang.org/x/crypto v0.49.0
+)
+
+require (
+	github.com/BurntSushi/toml v1.1.0 // indirect
+	github.com/andybalholm/brotli v1.0.6 // indirect
+	github.com/klauspost/compress v1.17.4 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/oschwald/maxminddb-golang v1.13.0 // indirect
+	golang.org/x/mod v0.33.0 // indirect
+	golang.org/x/net v0.51.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/text v0.35.0 // indirect
+	golang.org/x/tools v0.42.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,46 +1,61 @@
-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/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/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/klauspost/cpuid v1.2.0 h1:NMpwD2G9JSFOE1/TJjGSo5zG7Yb2bTe7eq1jH+irmeE=
-github.com/klauspost/cpuid v1.2.0/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
-github.com/klauspost/reedsolomon v1.9.0 h1:usyTY5K7D2B6WOHn2jmpB7ky8Qom96mShZmmq3OW4JU=
-github.com/klauspost/reedsolomon v1.9.0/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 v0.10.1 h1:ipcMmYP9RT+b1YytOKGUY1qndxPGOczVEQkAVz3CZrs=
-github.com/lucas-clemente/quic-go v0.10.1/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 v1.1.4 h1:rCMZsU2ScVSYcAsOXgmC6+AKOK+6pmQTOcw03nfwYV0=
-github.com/miekg/dns v1.1.4/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
-github.com/pelletier/go-toml v1.2.0 h1:T5zMGML61Wp+FlcbWjRDT7yAxhJNAiPPLOFECq181zc=
-github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
-github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
-github.com/pkg/errors v0.8.1/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/ulule/deepcopier v0.0.0-20171107155558-ca99b135e50f h1:QatZ4lsJBY3x1+Imst9g95+vUl7m52dqM9Pi4aSMW8w=
-github.com/ulule/deepcopier v0.0.0-20171107155558-ca99b135e50f/go.mod h1:BNLmYJ8oMJPIPpNx5968jCyUhwEU1XT3YsuOqtbo5qo=
-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/wweir/mem-go v0.0.0-20190109100331-8673ab596296 h1:/HkUfg+ZMx/tNdnyJdVlhyv+xO3A7ZlpfL9nFLWLYcc=
-github.com/wweir/mem-go v0.0.0-20190109100331-8673ab596296/go.mod h1:k7rjBGWoJ+JKwvfe8juAX0zgybjo/Yo3JGkca5f/06s=
-github.com/wweir/netboot v0.0.2 h1:DFuNd97kxzgblExEKn4Nqf1du0m9qUnaTQ70rFgIjLU=
-github.com/wweir/netboot v0.0.2/go.mod h1:p/WOnPHdqwgAI6YLEfdmwjwutbc/zDZ7EojAHlXLi4s=
-github.com/xtaci/kcp-go v5.0.7+incompatible h1:zs9tc8XRID0m+aetu3qPWZFyRt2UIMqbXIBgw+vcnlE=
-github.com/xtaci/kcp-go v5.0.7+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67 h1:ng3VDlRp5/DHpSWl02R4rM9I+8M2rhmsuLwAMmkLQWE=
-golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/net v0.0.0-20190213061140-3a22650c66bd h1:HuTn7WObtcDo9uEEU7rEqL0jYthdXAmZ6PP+meazmaU=
-golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/sys v0.0.0-20190213121743-983097b1a8a3 h1:+KlxhGbYkFs8lMfwKn+2ojry1ID5eBSMXprS2u/wqCE=
-golang.org/x/sys v0.0.0-20190213121743-983097b1a8a3/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+github.com/BurntSushi/toml v1.1.0 h1:ksErzDEI1khOiGPgpwuI7x2ebx/uXQNw7xJpn9Eq1+I=
+github.com/BurntSushi/toml v1.1.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
+github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/cristalhq/aconfig v0.17.0/go.mod h1:NXaRp+1e6bkO4dJn+wZ71xyaihMDYPtCSvEhMTm/H3E=
+github.com/cristalhq/aconfig v0.19.0 h1:fAo9ZObtzboHnf+5eAoMfb9KTDU5G/ij8OYO2wbpmM0=
+github.com/cristalhq/aconfig v0.19.0/go.mod h1:9ogrGEt9yU5V4pif/ThkVUfhj8JkdV+iDeahZGgfnDU=
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+github.com/cristalhq/aconfig/aconfigtoml v0.17.1/go.mod h1:xt4kCEjhgvHWO/oDGJHQHrW5CnvSEoBjJhRXVBdYbhQ=
+github.com/cristalhq/aconfig/aconfigyaml v0.17.1 h1:xCCbRKVmKrft9gQj3gHOq6U5PduasvlXEIsxtyzmFZ0=
+github.com/cristalhq/aconfig/aconfigyaml v0.17.1/go.mod h1:5DTsjHkvQ6hfbyxfG32roB1lF0U82rROtFaLxibL8V8=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/klauspost/compress v1.17.4 h1:Ej5ixsIri7BrIjBkRZLTo6ghwrEtHFk7ijlczPW4fZ4=
+github.com/klauspost/compress v1.17.4/go.mod h1:/dCuZOvVtNoHsyb+cuJD3itjs3NbnF6KH9zAO4BDxPM=
+github.com/krolaw/dhcp4 v0.0.0-20190909130307-a50d88189771 h1:t2c2B9g1ZVhMYduqmANSEGVD3/1WlsrEYNPtVoFlENk=
+github.com/krolaw/dhcp4 v0.0.0-20190909130307-a50d88189771/go.mod h1:0AqAH3ZogsCrvrtUpvc6EtVKbc3w6xwZhkvGLuqyi3o=
+github.com/libp2p/go-reuseport v0.4.0 h1:nR5KU7hD0WxXCJbmw7r2rhRYruNRl2koHw8fQscQm2s=
+github.com/libp2p/go-reuseport v0.4.0/go.mod h1:ZtI03j/wO5hZVDFo2jKywN6bYKWLOy8Se6DrI2E1cLU=
+github.com/lmittmann/tint v1.1.3 h1:Hv4EaHWXQr+GTFnOU4VKf8UvAtZgn0VuKT+G0wFlO3I=
+github.com/lmittmann/tint v1.1.3/go.mod h1:HIS3gSy7qNwGCj+5oRjAutErFBl4BzdQP6cJZ0NfMwE=
+github.com/miekg/dns v1.1.72 h1:vhmr+TF2A3tuoGNkLDFK9zi36F2LS+hKTRW0Uf8kbzI=
+github.com/miekg/dns v1.1.72/go.mod h1:+EuEPhdHOsfk6Wk5TT2CzssZdqkmFhf8r+aVyDEToIs=
+github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
+github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/oschwald/geoip2-golang v1.13.0 h1:Q44/Ldc703pasJeP5V9+aFSZFmBN7DKHbNsSFzQATJI=
+github.com/oschwald/geoip2-golang v1.13.0/go.mod h1:P9zG+54KPEFOliZ29i7SeYZ/GM6tfEL+rgSn03hYuUo=
+github.com/oschwald/maxminddb-golang v1.13.0 h1:R8xBorY71s84yO06NgTmQvqvTvlS/bnYZrrWX1MElnU=
+github.com/oschwald/maxminddb-golang v1.13.0/go.mod h1:BU0z8BfFVhi1LQaonTwwGQlsHUEu9pWNdMfmq4ztm0o=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/refraction-networking/utls v1.8.2 h1:j4Q1gJj0xngdeH+Ox/qND11aEfhpgoEvV+S9iJ2IdQo=
+github.com/refraction-networking/utls v1.8.2/go.mod h1:jkSOEkLqn+S/jtpEHPOsVv/4V4EVnelwbMQl4vCWXAM=
+github.com/sower-proxy/conns v0.1.1 h1:9VPVW+sFc/y/IvXbUQTbXNSPF3I+1IG5mbrQTt5bdTE=
+github.com/sower-proxy/conns v0.1.1/go.mod h1:p3ZM/8MolzW4TN0LaiPJnwnhhif3y9sBi2vQEWHvwhg=
+github.com/sower-proxy/deferlog/v2 v2.1.4 h1:Vo/iVWGw3Su625RP2RIy4mE5FlfRdfrgP7kwOWNOyec=
+github.com/sower-proxy/deferlog/v2 v2.1.4/go.mod h1:mdLrL/bxiTNhxeRLtRgKAecQddugI0iJ0ArC3yDwVSw=
+github.com/sower-proxy/mem v0.0.3 h1:JK86etQ2QxRUXhs9JhoKYz5p3pFBSrI3UXVhwm44OzM=
+github.com/sower-proxy/mem v0.0.3/go.mod h1:tM3P+gCAZMVBnOixGVAHS34si9Iwj2HU6M4IVEv4rK0=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
+golang.org/x/crypto v0.49.0/go.mod h1:ErX4dUh2UM+CFYiXZRTcMpEcN8b/1gxEuv3nODoYtCA=
+golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
+golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
+golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
+golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
+golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
+golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
+golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
+golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
+golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
+golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
+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/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/install/service.go

@@ -0,0 +1,204 @@
+package install
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"github.com/sower-proxy/sower/config"
+)
+
+type ConfirmFunc func(label string) bool
+
+type installOptions struct {
+	confirm           ConfirmFunc
+	geteuid           func() int
+	executable        func() (string, error)
+	evalSymlinks      func(string) (string, error)
+	serviceIsActive   func() bool
+	systemctl         func(args ...string) error
+	targetBinaryPath  string
+	servicePath       string
+	configPath        string
+	defaultFakeSite   string
+	defaultConfigTOML string
+}
+
+func InstallService(confirm ConfirmFunc) error {
+	return installService(installOptions{
+		confirm:           confirm,
+		geteuid:           os.Geteuid,
+		executable:        os.Executable,
+		evalSymlinks:      filepath.EvalSymlinks,
+		serviceIsActive:   serviceIsActive,
+		systemctl:         systemctl,
+		targetBinaryPath:  "/usr/local/bin/sowerd",
+		servicePath:       "/etc/systemd/system/sowerd.service",
+		configPath:        "/etc/sower/sowerd.toml",
+		defaultFakeSite:   "/var/www",
+		defaultConfigTOML: config.ExampleSowerdConfigTOML,
+	})
+}
+
+func installService(opts installOptions) error {
+	if opts.geteuid() != 0 {
+		return fmt.Errorf("installing systemd service requires root privileges, try running with sudo")
+	}
+
+	execPath, err := opts.executable()
+	if err != nil {
+		return fmt.Errorf("get executable path: %w", err)
+	}
+	execPath, err = opts.evalSymlinks(execPath)
+	if err != nil {
+		return fmt.Errorf("resolve executable symlink: %w", err)
+	}
+
+	isUpdate := opts.serviceIsActive()
+	if execPath != opts.targetBinaryPath {
+		label := fmt.Sprintf("Copy binary to %s?", opts.targetBinaryPath)
+		if isUpdate {
+			label = fmt.Sprintf("Update binary at %s?", opts.targetBinaryPath)
+		}
+		if opts.confirm != nil && opts.confirm(label) {
+			if err := copyFile(execPath, opts.targetBinaryPath, 0o755); err != nil {
+				return err
+			}
+			if isUpdate {
+				_ = opts.systemctl("stop", "sowerd")
+			}
+			fmt.Printf("  OK binary copied to %s\n", opts.targetBinaryPath)
+			execPath = opts.targetBinaryPath
+		}
+	}
+
+	if err := writeServiceFile(opts.servicePath, execPath, opts.configPath); err != nil {
+		return err
+	}
+	fmt.Printf("  OK service file installed: %s\n", opts.servicePath)
+
+	if err := ensureDefaultFiles(opts.configPath, opts.defaultFakeSite, opts.defaultConfigTOML); err != nil {
+		return err
+	}
+
+	if err := opts.systemctl("daemon-reload"); err != nil {
+		return err
+	}
+	fmt.Println("  OK systemd daemon reloaded")
+
+	if isUpdate {
+		return finishUpdate(opts.confirm, opts.systemctl)
+	}
+	return finishInstall(opts.confirm, opts.systemctl)
+}
+
+func finishInstall(confirm ConfirmFunc, systemctlFn func(args ...string) error) error {
+	if confirm == nil || !confirm("Start and enable sowerd service now?") {
+		fmt.Println()
+		fmt.Println("sowerd service installed. Next steps:")
+		fmt.Println("  1. Edit /etc/sower/sowerd.toml")
+		fmt.Println("  2. sudo systemctl start sowerd")
+		fmt.Println("  3. sudo systemctl enable sowerd")
+		return nil
+	}
+
+	if err := systemctlFn("enable", "sowerd"); err != nil {
+		return err
+	}
+	if err := systemctlFn("start", "sowerd"); err != nil {
+		return err
+	}
+	fmt.Println("  OK service enabled and started")
+	return nil
+}
+
+func finishUpdate(confirm ConfirmFunc, systemctlFn func(args ...string) error) error {
+	if confirm == nil || !confirm("Restart sowerd service now?") {
+		fmt.Println()
+		fmt.Println("sowerd service updated. To apply:")
+		fmt.Println("  sudo systemctl restart sowerd")
+		return nil
+	}
+
+	if err := systemctlFn("restart", "sowerd"); err != nil {
+		return err
+	}
+	fmt.Println("  OK service restarted")
+	return nil
+}
+
+func serviceIsActive() bool {
+	cmd := exec.Command("systemctl", "is-active", "--quiet", "sowerd")
+	return cmd.Run() == nil
+}
+
+func systemctl(args ...string) error {
+	cmd := exec.Command("systemctl", args...)
+	if output, err := cmd.CombinedOutput(); err != nil {
+		return fmt.Errorf("systemctl %s: %w - %s", strings.Join(args, " "), err, strings.TrimSpace(string(output)))
+	}
+	return nil
+}
+
+func copyFile(src, dst string, mode os.FileMode) error {
+	data, err := os.ReadFile(src)
+	if err != nil {
+		return fmt.Errorf("read binary %s: %w", src, err)
+	}
+	if err := os.MkdirAll(filepath.Dir(dst), 0o755); err != nil {
+		return fmt.Errorf("create binary directory: %w", err)
+	}
+	if err := os.WriteFile(dst, data, mode); err != nil {
+		return fmt.Errorf("write binary to %s: %w", dst, err)
+	}
+	return nil
+}
+
+func writeServiceFile(servicePath, execPath, configPath string) error {
+	if err := os.MkdirAll(filepath.Dir(servicePath), 0o755); err != nil {
+		return fmt.Errorf("create service directory: %w", err)
+	}
+
+	serviceContent := fmt.Sprintf(`[Unit]
+Description=sower server service
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=%s -c %s
+Restart=always
+RestartSec=5s
+
+[Install]
+WantedBy=multi-user.target
+`, execPath, configPath)
+
+	if err := os.WriteFile(servicePath, []byte(serviceContent), 0o644); err != nil {
+		return fmt.Errorf("write service file: %w", err)
+	}
+	return nil
+}
+
+func ensureDefaultFiles(configPath, fakeSiteDir, defaultConfigTOML string) error {
+	if err := os.MkdirAll(filepath.Dir(configPath), 0o755); err != nil {
+		return fmt.Errorf("create config directory: %w", err)
+	}
+	if err := os.MkdirAll(fakeSiteDir, 0o755); err != nil {
+		return fmt.Errorf("create fake site directory: %w", err)
+	}
+
+	if _, err := os.Stat(configPath); err == nil {
+		return nil
+	} else if !os.IsNotExist(err) {
+		return fmt.Errorf("stat default config path: %w", err)
+	}
+
+	if err := os.WriteFile(configPath, []byte(defaultConfigTOML), 0o644); err != nil {
+		return fmt.Errorf("write default config: %w", err)
+	}
+	fmt.Printf("  OK default config written to %s\n", configPath)
+	return nil
+}

internal/install/service_test.go

@@ -0,0 +1,177 @@
+package install
+
+import (
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestInstallServiceRequiresRoot(t *testing.T) {
+	t.Parallel()
+
+	err := installService(installOptions{
+		geteuid: func() int { return 1000 },
+	})
+	if err == nil || !strings.Contains(err.Error(), "root privileges") {
+		t.Fatalf("installService() error = %v, want root privileges error", err)
+	}
+}
+
+func TestInstallServiceFreshInstall(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	execPath := filepath.Join(tmpDir, "sowerd")
+	if err := os.WriteFile(execPath, []byte("binary"), 0o755); err != nil {
+		t.Fatalf("write executable: %v", err)
+	}
+
+	targetBinaryPath := filepath.Join(tmpDir, "usr", "local", "bin", "sowerd")
+	servicePath := filepath.Join(tmpDir, "etc", "systemd", "system", "sowerd.service")
+	configPath := filepath.Join(tmpDir, "etc", "sower", "sowerd.toml")
+	fakeSiteDir := filepath.Join(tmpDir, "var", "www")
+
+	var prompts []string
+	var systemctlCalls []string
+	confirmAnswers := map[string]bool{
+		"Copy binary to " + targetBinaryPath + "?": true,
+		"Start and enable sowerd service now?":     true,
+	}
+
+	err := installService(installOptions{
+		confirm: func(label string) bool {
+			prompts = append(prompts, label)
+			return confirmAnswers[label]
+		},
+		geteuid:         func() int { return 0 },
+		executable:      func() (string, error) { return execPath, nil },
+		evalSymlinks:    func(path string) (string, error) { return path, nil },
+		serviceIsActive: func() bool { return false },
+		systemctl: func(args ...string) error {
+			systemctlCalls = append(systemctlCalls, strings.Join(args, " "))
+			return nil
+		},
+		targetBinaryPath:  targetBinaryPath,
+		servicePath:       servicePath,
+		configPath:        configPath,
+		defaultFakeSite:   fakeSiteDir,
+		defaultConfigTOML: `password = "change_me"` + "\n" + `fakeSite = "/var/www"` + "\n",
+	})
+	if err != nil {
+		t.Fatalf("installService() error = %v", err)
+	}
+
+	gotBinary, err := os.ReadFile(targetBinaryPath)
+	if err != nil {
+		t.Fatalf("read target binary: %v", err)
+	}
+	if string(gotBinary) != "binary" {
+		t.Fatalf("target binary = %q, want %q", string(gotBinary), "binary")
+	}
+
+	serviceContent, err := os.ReadFile(servicePath)
+	if err != nil {
+		t.Fatalf("read service file: %v", err)
+	}
+	serviceText := string(serviceContent)
+	if !strings.Contains(serviceText, "ExecStart="+targetBinaryPath+" -c "+configPath) {
+		t.Fatalf("service file missing ExecStart, content = %s", serviceText)
+	}
+
+	configContent, err := os.ReadFile(configPath)
+	if err != nil {
+		t.Fatalf("read config file: %v", err)
+	}
+	if string(configContent) == "" {
+		t.Fatal("config file is empty")
+	}
+
+	if info, err := os.Stat(fakeSiteDir); err != nil || !info.IsDir() {
+		t.Fatalf("fake site dir stat err = %v, isDir = %v", err, err == nil && info.IsDir())
+	}
+
+	wantPrompts := []string{
+		"Copy binary to " + targetBinaryPath + "?",
+		"Start and enable sowerd service now?",
+	}
+	if !reflect.DeepEqual(prompts, wantPrompts) {
+		t.Fatalf("prompts = %#v, want %#v", prompts, wantPrompts)
+	}
+
+	wantSystemctlCalls := []string{
+		"daemon-reload",
+		"enable sowerd",
+		"start sowerd",
+	}
+	if !reflect.DeepEqual(systemctlCalls, wantSystemctlCalls) {
+		t.Fatalf("systemctl calls = %#v, want %#v", systemctlCalls, wantSystemctlCalls)
+	}
+}
+
+func TestInstallServiceUpdateWithoutRestart(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	targetBinaryPath := filepath.Join(tmpDir, "usr", "local", "bin", "sowerd")
+	if err := os.MkdirAll(filepath.Dir(targetBinaryPath), 0o755); err != nil {
+		t.Fatalf("mkdir target binary dir: %v", err)
+	}
+	if err := os.WriteFile(targetBinaryPath, []byte("binary"), 0o755); err != nil {
+		t.Fatalf("write target binary: %v", err)
+	}
+
+	servicePath := filepath.Join(tmpDir, "etc", "systemd", "system", "sowerd.service")
+	configPath := filepath.Join(tmpDir, "etc", "sower", "sowerd.toml")
+	if err := os.MkdirAll(filepath.Dir(configPath), 0o755); err != nil {
+		t.Fatalf("mkdir config dir: %v", err)
+	}
+	if err := os.WriteFile(configPath, []byte("password = \"existing\"\n"), 0o644); err != nil {
+		t.Fatalf("write existing config: %v", err)
+	}
+
+	var prompts []string
+	var systemctlCalls []string
+
+	err := installService(installOptions{
+		confirm: func(label string) bool {
+			prompts = append(prompts, label)
+			return false
+		},
+		geteuid:         func() int { return 0 },
+		executable:      func() (string, error) { return targetBinaryPath, nil },
+		evalSymlinks:    func(path string) (string, error) { return path, nil },
+		serviceIsActive: func() bool { return true },
+		systemctl: func(args ...string) error {
+			systemctlCalls = append(systemctlCalls, strings.Join(args, " "))
+			return nil
+		},
+		targetBinaryPath:  targetBinaryPath,
+		servicePath:       servicePath,
+		configPath:        configPath,
+		defaultFakeSite:   filepath.Join(tmpDir, "var", "www"),
+		defaultConfigTOML: "password = \"change_me\"\n",
+	})
+	if err != nil {
+		t.Fatalf("installService() error = %v", err)
+	}
+
+	configContent, err := os.ReadFile(configPath)
+	if err != nil {
+		t.Fatalf("read config file: %v", err)
+	}
+	if string(configContent) != "password = \"existing\"\n" {
+		t.Fatalf("config content = %q, want existing config to be preserved", string(configContent))
+	}
+
+	wantPrompts := []string{"Restart sowerd service now?"}
+	if !reflect.DeepEqual(prompts, wantPrompts) {
+		t.Fatalf("prompts = %#v, want %#v", prompts, wantPrompts)
+	}
+
+	wantSystemctlCalls := []string{"daemon-reload"}
+	if !reflect.DeepEqual(systemctlCalls, wantSystemctlCalls) {
+		t.Fatalf("systemctl calls = %#v, want %#v", systemctlCalls, wantSystemctlCalls)
+	}
+}

main.go

@@ -1,28 +0,0 @@
-package main
-
-import (
-	"github.com/golang/glog"
-	"github.com/wweir/sower/conf"
-	"github.com/wweir/sower/dns"
-	"github.com/wweir/sower/proxy"
-)
-
-var version, date string
-
-func main() {
-	conf := conf.Conf
-	glog.Infof("Starting sower(%s %s): %v", version, date, conf)
-
-	if conf.ServerAddr == "" {
-		proxy.StartServer(conf.NetType, conf.ServerPort, conf.Cipher, conf.Password)
-
-	} else {
-		if conf.HTTPProxy != "" {
-			go proxy.StartHttpProxy(conf.NetType, conf.ServerAddr,
-				conf.Cipher, conf.Password, conf.HTTPProxy)
-		}
-
-		go dns.StartDNS(conf.DNSServer, conf.ClientIP)
-		proxy.StartClient(conf.NetType, conf.ServerAddr, conf.Cipher, conf.Password, conf.ClientIP)
-	}
-}

parse/parse_addr.go

@@ -1,48 +0,0 @@
-package parse
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"net"
-	"net/http"
-	"strings"
-
-	"github.com/wweir/sower/util"
-)
-
-func ParseAddr(conn net.Conn) (teeConn *util.TeeConn, addr string, err error) {
-	teeConn = &util.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
-}

pkg/dhcp/dhcp.go

@@ -0,0 +1,67 @@
+package dhcp
+
+import (
+	"crypto/rand"
+	"fmt"
+	"net"
+	"runtime"
+	"time"
+
+	"errors"
+	"github.com/krolaw/dhcp4"
+	"github.com/libp2p/go-reuseport"
+)
+
+var broadcastAddr, _ = net.ResolveUDPAddr("udp", "255.255.255.255:67")
+
+func GetDNSServer() ([]string, error) {
+	iface, err := PickInternetInterface()
+	if err != nil {
+		return nil, fmt.Errorf("pick interface: %w", err)
+	}
+
+	xid := make([]byte, 4)
+	if _, err := rand.Read(xid); err != nil {
+		return nil, fmt.Errorf("generate xid: %w", err)
+	}
+	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, fmt.Errorf("listen dhcp: %w", err)
+		}
+	} else {
+		if conn, err = reuseport.ListenPacket("udp4", "0.0.0.0:68"); err != nil {
+			return nil, fmt.Errorf("listen dhcp: %w", err)
+		}
+	}
+	defer conn.Close()
+	conn.SetDeadline(time.Now().Add(3 * time.Second))
+
+	if _, err := conn.WriteTo([]byte(pack), broadcastAddr); err != nil {
+		return nil, fmt.Errorf("write broadcast: %w", err)
+	}
+
+	buf := make([]byte, 1500 /*MTU*/)
+	n, _, err := conn.ReadFrom(buf)
+	if err != nil {
+		return nil, fmt.Errorf("read dhcp offer: %w", err)
+	}
+
+	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/sower-proxy/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 +1,41 @@
+//go:build !windows
+// +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 ifaces[i].Flags&net.FlagUp == 0 || ifaces[i].Flags&net.FlagLoopback != 0 {
+			continue
+		}
+		if len(ifaces[i].HardwareAddr) == 0 {
+			continue
+		}
+
+		addrs, err := ifaces[i].Addrs()
+		if err != nil {
+			continue
+		}
+		for _, addr := range addrs {
+			ipNet, ok := addr.(*net.IPNet)
+			if !ok {
+				continue
+			}
+			if ip := ipNet.IP.To4(); ip != nil && ip.IsGlobalUnicast() {
+				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/sower-proxy/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 +1,184 @@
+package suffixtree
+
+import (
+	"strings"
+)
+
+type Node struct {
+	*node
+	sep   string
+	Count uint64
+}
+type node struct {
+	secs     []string
+	subNodes []*node
+	indexMap map[string]int
+}
+
+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.ToLower(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]
+		if idx := n.index(sec); idx >= 0 {
+			if n.subNodes[idx] != nil {
+				n.subNodes[idx].add([]string{""})
+			}
+			return
+		}
+
+		switch sec {
+		case "", "*", "**":
+			n.prepend(sec, nil)
+		default:
+			n.append(sec, 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 = n.prepend(sec, &node{})
+			default:
+				idx = n.append(sec, &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))
+}
+
+func (n *node) matchSecs(secs []string) 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]) {
+			return true
+		}
+	}
+	if idx := n.index("*"); idx >= 0 {
+		if n.subNodes[idx].matchSecs(secs[:length-1]) {
+			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
+	}
+
+	if n.indexMap != nil {
+		if idx, ok := n.indexMap[sec]; ok {
+			return idx
+		}
+		return -1
+	}
+
+	for i := range n.secs {
+		if n.secs[i] == sec {
+			n.ensureIndexMap()
+			n.indexMap[sec] = i
+			return i
+		}
+	}
+
+	return -1
+}
+
+func (n *node) append(sec string, child *node) int {
+	n.secs = append(n.secs, sec)
+	n.subNodes = append(n.subNodes, child)
+	n.ensureIndexMap()
+	idx := len(n.secs) - 1
+	n.indexMap[sec] = idx
+	return idx
+}
+
+func (n *node) prepend(sec string, child *node) int {
+	n.secs = append([]string{sec}, n.secs...)
+	n.subNodes = append([]*node{child}, n.subNodes...)
+	n.indexMap = nil
+	n.ensureIndexMap()
+	return 0
+}
+
+func (n *node) ensureIndexMap() {
+	if n.indexMap != nil {
+		return
+	}
+
+	n.indexMap = make(map[string]int, len(n.secs))
+	for i := range n.secs {
+		n.indexMap[n.secs[i]] = i
+	}
+}

pkg/suffixtree/suffix_tree_test.go

@@ -0,0 +1,123 @@
+package suffixtree_test
+
+import (
+	"testing"
+
+	"github.com/sower-proxy/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},
+		},
+	}, {
+		"normalize domain",
+		suffixtree.NewNodeFromRules("GitHub.Com", "*.Example.Com", "**.Foo.Com"),
+		[]test{
+			{"github.com", true},
+			{"GitHub.com", true},
+			{"github.com.", true},
+			{"a.example.com", true},
+			{"A.Example.Com", true},
+			{"foo.com", true},
+			{"a.b.foo.com", true},
+		},
+	}, {
+		"parent after child",
+		suffixtree.NewNodeFromRules("a.wweir.cc", "wweir.cc"),
+		[]test{
+			{"wweir.cc", true},
+			{"a.wweir.cc", true},
+			{"b.wweir.cc", false},
+		},
+	}, {
+		"wildcard after child",
+		suffixtree.NewNodeFromRules("a.wweir.cc", "*.wweir.cc"),
+		[]test{
+			{"a.wweir.cc", true},
+			{"b.wweir.cc", true},
+			{"a.b.wweir.cc", false},
+		},
+	}, {
+		"deep wildcard after child",
+		suffixtree.NewNodeFromRules("a.b.foo.com", "**.foo.com"),
+		[]test{
+			{"foo.com", true},
+			{"a.b.foo.com", true},
+			{"z.foo.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...)
+}

pkg/upstreamtls/upstreamtls.go

@@ -0,0 +1,107 @@
+package upstreamtls
+
+import (
+	cryptotls "crypto/tls"
+	"fmt"
+	"net"
+	"strings"
+	"time"
+
+	utls "github.com/refraction-networking/utls"
+)
+
+type Options struct {
+	ServerName         string
+	ClientHello        string
+	InsecureSkipVerify bool
+}
+
+func ValidateClientHello(value string) error {
+	_, err := clientHelloID(value)
+	return err
+}
+
+func Dial(dialer *net.Dialer, network, addr string, options Options) (net.Conn, error) {
+	if options.ClientHello == "" {
+		return cryptotls.DialWithDialer(dialer, network, addr, &cryptotls.Config{
+			ServerName:         options.ServerName,
+			InsecureSkipVerify: options.InsecureSkipVerify,
+		})
+	}
+
+	helloID, err := clientHelloID(options.ClientHello)
+	if err != nil {
+		return nil, err
+	}
+
+	rawConn, err := dialer.Dial(network, addr)
+	if err != nil {
+		return nil, err
+	}
+
+	if timeout := dialer.Timeout; timeout > 0 {
+		if err := rawConn.SetDeadline(time.Now().Add(timeout)); err != nil {
+			rawConn.Close()
+			return nil, fmt.Errorf("set tls deadline: %w", err)
+		}
+		defer rawConn.SetDeadline(time.Time{})
+	}
+
+	serverName := options.ServerName
+	if serverName == "" {
+		host, _, err := net.SplitHostPort(addr)
+		if err != nil {
+			rawConn.Close()
+			return nil, fmt.Errorf("split tls addr %q: %w", addr, err)
+		}
+		serverName = host
+	}
+
+	conn := utls.UClient(rawConn, &utls.Config{
+		ServerName:         serverName,
+		InsecureSkipVerify: options.InsecureSkipVerify,
+	}, helloID)
+	if err := conn.Handshake(); err != nil {
+		rawConn.Close()
+		return nil, fmt.Errorf("utls handshake: %w", err)
+	}
+	return conn, nil
+}
+
+func clientHelloID(value string) (utls.ClientHelloID, error) {
+	switch normalizeClientHello(value) {
+	case "chrome":
+		return utls.HelloChrome_Auto, nil
+	case "firefox":
+		return utls.HelloFirefox_Auto, nil
+	case "ios":
+		return utls.HelloIOS_Auto, nil
+	case "android":
+		return utls.HelloAndroid_11_OkHttp, nil
+	case "edge":
+		return utls.HelloEdge_Auto, nil
+	case "safari":
+		return utls.HelloSafari_Auto, nil
+	case "360":
+		return utls.Hello360_Auto, nil
+	case "qq":
+		return utls.HelloQQ_Auto, nil
+	case "randomized":
+		return utls.HelloRandomized, nil
+	case "randomizedalpn":
+		return utls.HelloRandomizedALPN, nil
+	case "randomizednoalpn":
+		return utls.HelloRandomizedNoALPN, nil
+	case "golang":
+		return utls.HelloGolang, nil
+	default:
+		return utls.ClientHelloID{}, fmt.Errorf("unsupported tls client hello %q", value)
+	}
+}
+
+func normalizeClientHello(value string) string {
+	value = strings.TrimSpace(strings.ToLower(value))
+	value = strings.ReplaceAll(value, "-", "")
+	value = strings.ReplaceAll(value, "_", "")
+	return value
+}

pkg/upstreamtls/upstreamtls_test.go

@@ -0,0 +1,21 @@
+package upstreamtls
+
+import "testing"
+
+func TestValidateClientHelloAcceptsAliases(t *testing.T) {
+	t.Parallel()
+
+	for _, value := range []string{"chrome", "firefox", "randomized_alpn", "randomized-no-alpn", "golang"} {
+		if err := ValidateClientHello(value); err != nil {
+			t.Fatalf("validate %q: %v", value, err)
+		}
+	}
+}
+
+func TestValidateClientHelloRejectsUnknownValue(t *testing.T) {
+	t.Parallel()
+
+	if err := ValidateClientHello("unknown"); err == nil {
+		t.Fatal("expected validation error")
+	}
+}

proxy/client.go

@@ -1,81 +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 NewClient(netType string) Client {
-	switch netType {
-	case QUIC.String():
-		return quic.NewClient()
-	case KCP.String():
-		return kcp.NewClient()
-	case TCP.String():
-		return tcp.NewClient()
-	default:
-		glog.Fatalln("invalid net type: " + netType)
-		return nil
-	}
-}
-
-func StartClient(netType, server, cipher, password, listenIP string) {
-	connCh := listenLocal(listenIP, []string{"80", "443"})
-	client := NewClient(netType)
-	if addr, err := net.ResolveTCPAddr("tcp", server); err != nil {
-		glog.Fatalln(err)
-	} else {
-		server = addr.String()
-	}
-
-	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
-		}
-		rc = shadow.Shadow(rc, cipher, password)
-
-		go relay(conn, rc)
-	}
-}
-
-func listenLocal(listenIP string, ports []string) <-chan net.Conn {
-	connCh := make(chan net.Conn, 10)
-	for i := range ports {
-		go func(port string) {
-			ln, err := net.Listen("tcp", net.JoinHostPort(listenIP, port))
-			if err != nil {
-				glog.Fatalln(err)
-			}
-
-			for {
-				conn, err := ln.Accept()
-				if err != nil {
-					glog.Errorln("accept", listenIP+port, "fail:", err)
-					continue
-				}
-
-				conn.(*net.TCPConn).SetKeepAlive(true)
-				connCh <- conn
-			}
-		}(ports[i])
-	}
-
-	glog.Infoln("listening ports:", ports)
-	return connCh
-}

proxy/http_proxy.go

@@ -1,98 +0,0 @@
-package proxy
-
-import (
-	"context"
-	"crypto/tls"
-	"io"
-	"net"
-	"net/http"
-	"time"
-
-	"github.com/golang/glog"
-	"github.com/wweir/sower/shadow"
-)
-
-func StartHttpProxy(netType, server, cipher, password, addr string) {
-	client := NewClient(netType)
-	if addr, err := net.ResolveTCPAddr("tcp", server); err != nil {
-		glog.Fatalln(err)
-	} else {
-		server = addr.String()
-	}
-
-	srv := &http.Server{
-		Addr: addr,
-		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			if r.Method == http.MethodConnect {
-				httpsProxy(w, r, client, server, cipher, password)
-			} else {
-				httpProxy(w, r, client, server, cipher, password)
-			}
-		}),
-		// Disable HTTP/2.
-		TLSNextProto: map[string]func(*http.Server, *tls.Conn, http.Handler){},
-		IdleTimeout:  90 * time.Second,
-	}
-
-	glog.Fatalln(srv.ListenAndServe())
-}
-
-func httpProxy(w http.ResponseWriter, req *http.Request, client Client, server, cipher, password string) {
-	roundTripper := &http.Transport{
-		DialContext: func(context.Context, string, string) (net.Conn, error) {
-			conn, err := client.Dial(server)
-			if err != nil {
-				return nil, err
-			}
-			return shadow.Shadow(conn, cipher, password), nil
-		},
-		MaxIdleConns:          100,
-		IdleConnTimeout:       90 * time.Second,
-		TLSHandshakeTimeout:   10 * time.Second,
-		ExpectContinueTimeout: 1 * time.Second,
-	}
-
-	resp, err := roundTripper.RoundTrip(req)
-	if err != nil {
-		http.Error(w, err.Error(), http.StatusServiceUnavailable)
-		glog.Errorln("serve https proxy, get remote data:", err)
-		return
-	}
-	defer resp.Body.Close()
-
-	for k, vs := range resp.Header {
-		for _, v := range vs {
-			w.Header().Add(k, v)
-		}
-	}
-	w.WriteHeader(resp.StatusCode)
-	io.Copy(w, resp.Body)
-}
-
-func httpsProxy(w http.ResponseWriter, r *http.Request, client Client, server, cipher, password string) {
-	// local conn
-	conn, _, err := w.(http.Hijacker).Hijack()
-	if err != nil {
-		http.Error(w, err.Error(), http.StatusServiceUnavailable)
-		return
-	}
-	conn.(*net.TCPConn).SetKeepAlive(true)
-
-	if _, err := conn.Write([]byte(r.Proto + " 200 Connection established\r\n\r\n")); err != nil {
-		conn.Close()
-		glog.Errorln("serve https proxy, write data fail:", err)
-		return
-	}
-
-	// remote conn
-	rc, err := client.Dial(server)
-	if err != nil {
-		conn.Close()
-		http.Error(w, err.Error(), http.StatusServiceUnavailable)
-		glog.Errorln("serve https proxy, dial remote fail:", err)
-		return
-	}
-	rc = shadow.Shadow(rc, cipher, password)
-
-	relay(rc, conn)
-}

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() *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

@@ -1,57 +0,0 @@
-package quic
-
-import (
-	"crypto/tls"
-	"net"
-	"time"
-
-	quic "github.com/lucas-clemente/quic-go"
-	"github.com/pkg/errors"
-	"github.com/wweir/sower/util"
-)
-
-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,
-			IdleTimeout:        5 * time.Minute,
-		},
-	}
-}
-
-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 {
-			go func() {
-				<-sess.Context().Done()
-				sess.Close()
-				c.sess = nil
-			}()
-			c.sess = sess
-		}
-	}
-
-	var stream quic.Stream
-	if err := util.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

@@ -1,59 +0,0 @@
-package quic
-
-import (
-	"net"
-	"time"
-
-	"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,
-			IdleTimeout:        5 * time.Minute,
-		},
-	}
-}
-
-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

@@ -1,48 +0,0 @@
-package quic
-
-import (
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/pem"
-	"math/big"
-	"net"
-
-	"github.com/golang/glog"
-	quic "github.com/lucas-clemente/quic-go"
-)
-
-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}}
-}

proxy/server.go

@@ -1,73 +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 NewServer(netType string) Server {
-	switch netType {
-	case QUIC.String():
-		return quic.NewServer()
-	case KCP.String():
-		return kcp.NewServer()
-	case TCP.String():
-		return tcp.NewServer()
-	default:
-		glog.Fatalln("invalid net type: " + netType)
-		return nil
-	}
-}
-
-func StartServer(netType, port, cipher, password string) {
-	if port == "" {
-		glog.Fatalln("port must set")
-	}
-	if !strings.Contains(port, ":") {
-		port = ":" + port
-	}
-
-	connCh, err := NewServer(netType).Listen(port)
-	if err != nil {
-		glog.Fatalf("listen %v fail: %s", port, err)
-	}
-
-	glog.Infoln("Server started.")
-	for {
-		conn := <-connCh
-		conn = shadow.Shadow(conn, cipher, password)
-
-		go handle(conn)
-	}
-}
-
-func handle(conn net.Conn) {
-	conn, addr, err := parse.ParseAddr(conn)
-	if err != nil {
-		conn.Close()
-		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 {
-		conn.Close()
-		glog.Warningln(err)
-		return
-	}
-	rc.(*net.TCPConn).SetKeepAlive(true)
-
-	relay(rc, conn)
-}

proxy/tcp/client.go

@@ -1,26 +0,0 @@
-package tcp
-
-import (
-	"net"
-	"time"
-)
-
-type client struct {
-	DialTimeout time.Duration
-}
-
-func NewClient() *client {
-	return &client{
-		DialTimeout: 5 * time.Second,
-	}
-}
-
-func (c *client) Dial(server string) (net.Conn, error) {
-	conn, err := net.DialTimeout("tcp", server, c.DialTimeout)
-	if err != nil {
-		return nil, err
-	}
-
-	conn.(*net.TCPConn).SetKeepAlive(true)
-	return conn, nil
-}

proxy/tcp/server.go

@@ -1,35 +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)
-			}
-
-			conn.(*net.TCPConn).SetKeepAlive(true)
-			connCh <- conn
-		}
-	}()
-	return connCh, nil
-}

proxy/util.go

@@ -1,47 +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) {
-		// wakeup blocked goroutine
-		now := time.Now()
-		src.SetDeadline(now)
-		dst.SetDeadline(now)
-	} else {
-		src.Close()
-		dst.Close()
-	}
-
-	wg.Done()
-}

router/country.go

@@ -0,0 +1,47 @@
+package router
+
+import (
+	"context"
+	"log/slog"
+	"net"
+	"time"
+)
+
+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 {
+			slog.Warn("resolve domain", "error", err, "domain", domain, "ips", len(ips))
+			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 {
+			slog.Warn("mmdb search", "error", err, "domain", domain, "ip", ip)
+			return false
+		}
+
+		if city.Country.IsoCode == "CN" {
+			return true
+		}
+	}
+
+	return false
+}

router/dns.go

@@ -0,0 +1,508 @@
+package router
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/miekg/dns"
+)
+
+var errNoLocalIPForQuestionType = errors.New("no local IP for question type")
+
+type retryableDNSError struct {
+	rcode int
+}
+
+func (e retryableDNSError) Error() string {
+	return fmt.Sprintf("retryable dns response code %s", dns.RcodeToString[e.rcode])
+}
+
+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) != 1 {
+		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeFormatError))
+		return
+	}
+
+	domain := req.Question[0].Name
+	qtype := req.Question[0].Qtype
+	if req.Question[0].Qclass != dns.ClassINET {
+		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeNotImplemented))
+		return
+	}
+
+	// 1. rule_based( block > direct > proxy )
+	routeDomains := dnsRouteDomains(domain, qtype)
+	if dnsRuleMatch(r.BlockRule, routeDomains) {
+		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeNameError))
+		return
+	}
+
+	if !dnsRuleMatch(r.DirectRule, routeDomains) && dnsRuleMatch(r.ProxyRule, routeDomains) {
+		switch {
+		case isAddressQuestion(qtype):
+			resp, err := r.dnsProxyReply(domain, w.LocalAddr(), req)
+			if err != nil {
+				slog.Warn("proxy dns", "error", err, "domain", domain)
+				_ = w.WriteMsg(r.dnsFail(req, dns.RcodeServerFailure))
+				return
+			}
+			_ = w.WriteMsg(resp)
+			return
+		default:
+			_ = w.WriteMsg(r.dnsNoData(req))
+			return
+		}
+	}
+
+	// 2. direct query, 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) dnsNoData(req *dns.Msg) *dns.Msg {
+	return dnsReply(req)
+}
+
+func (r *Router) dnsProxyReply(domain string, localAddr net.Addr, req *dns.Msg) (*dns.Msg, error) {
+	qtype := req.Question[0].Qtype
+	reply := dnsReply(req)
+
+	localIP, err := r.proxyReplyIP(localAddr, qtype)
+	if err != nil {
+		if errors.Is(err, errNoLocalIPForQuestionType) {
+			return reply, nil
+		}
+		return nil, err
+	}
+
+	record, err := proxyReplyRecord(domain, qtype, localIP)
+	if err != nil {
+		return nil, err
+	}
+	reply.Answer = []dns.RR{record}
+	return reply, nil
+}
+
+func (r *Router) proxyReplyIP(localAddr net.Addr, qtype uint16) (net.IP, error) {
+	if !isAddressQuestion(qtype) {
+		return nil, fmt.Errorf("unsupported question type %d", qtype)
+	}
+
+	var localAddrErr error
+	if localAddr != nil {
+		host, _, err := net.SplitHostPort(localAddr.String())
+		if err != nil {
+			localAddrErr = fmt.Errorf("split local dns address %q: %w", localAddr.String(), err)
+		} else {
+			ip := net.ParseIP(strings.Trim(host, "[]"))
+			switch {
+			case ip == nil:
+				localAddrErr = fmt.Errorf("parse local dns IP %q", host)
+			case !ip.IsUnspecified() && matchesQuestionTypeIP(ip, qtype):
+				return ip, nil
+			}
+		}
+	}
+
+	for _, serveIP := range r.dns.serveIPs {
+		if !serveIP.IsUnspecified() && matchesQuestionTypeIP(serveIP, qtype) {
+			return serveIP, nil
+		}
+	}
+
+	if localAddrErr != nil {
+		return nil, localAddrErr
+	}
+	return nil, fmt.Errorf("%w %d", errNoLocalIPForQuestionType, qtype)
+}
+
+func isAddressQuestion(qtype uint16) bool {
+	return qtype == dns.TypeA || qtype == dns.TypeAAAA
+}
+
+func dnsRuleMatch(rule interface{ Match(string) bool }, domains []string) bool {
+	for _, domain := range domains {
+		if rule.Match(domain) {
+			return true
+		}
+	}
+	return false
+}
+
+func dnsRouteDomains(domain string, qtype uint16) []string {
+	if !isServiceDiscoveryQuestion(qtype) {
+		return []string{domain}
+	}
+
+	base, ok := stripDNSServicePrefix(domain)
+	if !ok {
+		return []string{domain}
+	}
+	return []string{domain, base}
+}
+
+func isServiceDiscoveryQuestion(qtype uint16) bool {
+	switch qtype {
+	case dns.TypeSRV, dns.TypeSVCB, dns.TypeHTTPS:
+		return true
+	default:
+		return false
+	}
+}
+
+func stripDNSServicePrefix(domain string) (string, bool) {
+	trimmed := strings.TrimSuffix(domain, ".")
+	labels := strings.Split(trimmed, ".")
+	if len(labels) <= 2 || !strings.HasPrefix(labels[0], "_") || !strings.HasPrefix(labels[1], "_") {
+		return "", false
+	}
+	return strings.Join(labels[2:], ".") + ".", true
+}
+
+func dnsReply(req *dns.Msg) *dns.Msg {
+	reply := new(dns.Msg)
+	reply.SetReply(req)
+	return reply
+}
+
+func proxyReplyRecord(domain string, qtype uint16, localIP net.IP) (dns.RR, error) {
+	switch qtype {
+	case dns.TypeA:
+		return &dns.A{
+			Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 20},
+			A:   localIP,
+		}, nil
+	case dns.TypeAAAA:
+		return &dns.AAAA{
+			Hdr:  dns.RR_Header{Name: domain, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 20},
+			AAAA: localIP,
+		}, nil
+	default:
+		return nil, fmt.Errorf("unsupported question type %d", qtype)
+	}
+}
+
+func matchesQuestionTypeIP(ip net.IP, qtype uint16) bool {
+	switch qtype {
+	case dns.TypeA:
+		return ip.To4() != nil
+	case dns.TypeAAAA:
+		return ip.To4() == nil
+	default:
+		return false
+	}
+}
+
+const (
+	dnsTimeout       = 2 * time.Second
+	dnsUDPSize       = 1232
+	dnsRetryInterval = 30 * time.Second
+	dnsRefreshTTL    = 5 * time.Minute
+)
+
+func (r *Router) Exchange(req *dns.Msg) (_ *dns.Msg, err error) {
+	addrs, index, shouldProbe, err := r.currentUpstreamState(time.Now())
+	if err != nil {
+		return nil, err
+	}
+
+	if shouldProbe {
+		resp, probeErr := r.exchangeWithRetry(req, addrs[0])
+		if probeErr == nil {
+			r.promoteUpstream()
+			return resp, nil
+		}
+		r.scheduleRetry(time.Now())
+	}
+
+	resp, err := r.exchangeWithRetry(req, addrs[index])
+	if err != nil {
+		nextIndex, switched := r.degradeUpstream(index)
+		if switched {
+			slog.Info("use upstream dns", "ip", addrs[nextIndex])
+			resp, err = r.exchangeWithRetry(req, addrs[nextIndex])
+		}
+	}
+
+	if resp != nil && isRetryableDNSResponseErr(err) {
+		return resp, nil
+	}
+	return resp, err
+}
+
+func isRetryableDNSResponseErr(err error) bool {
+	var retryableErr retryableDNSError
+	return errors.As(err, &retryableErr)
+}
+
+func (r *Router) currentUpstreamState(now time.Time) ([]string, int, bool, error) {
+	for {
+		addrs, index, shouldProbe, needRefresh, err := r.prepareUpstreamState(now)
+		if !needRefresh || err != nil {
+			return addrs, index, shouldProbe, err
+		}
+
+		refreshedAddrs, refreshErr := r.buildUpstreamAddrs()
+		r.finishUpstreamRefresh(now, refreshedAddrs, refreshErr)
+	}
+}
+
+func (r *Router) degradeUpstream(index int) (int, bool) {
+	r.dns.Lock()
+	defer r.dns.Unlock()
+
+	if len(r.dns.upstreamAddrs) == 0 || r.dns.upstreamIndex != index || index >= len(r.dns.upstreamAddrs)-1 {
+		return r.dns.upstreamIndex, false
+	}
+
+	r.dns.upstreamIndex = index + 1
+	r.dns.retryAt = time.Now().Add(dnsRetryInterval)
+	r.dns.probeInFlight = false
+	return r.dns.upstreamIndex, true
+}
+
+func (r *Router) promoteUpstream() {
+	r.dns.Lock()
+	defer r.dns.Unlock()
+
+	r.dns.upstreamIndex = 0
+	r.dns.retryAt = time.Time{}
+	r.dns.probeInFlight = false
+}
+
+func (r *Router) scheduleRetry(now time.Time) {
+	r.dns.Lock()
+	defer r.dns.Unlock()
+
+	if r.dns.upstreamIndex > 0 {
+		r.dns.retryAt = now.Add(dnsRetryInterval)
+		r.dns.probeInFlight = false
+	}
+}
+
+func (r *Router) prepareUpstreamState(now time.Time) ([]string, int, bool, bool, error) {
+	r.dns.Lock()
+	defer r.dns.Unlock()
+
+	needRefresh := false
+	switch {
+	case len(r.dns.upstreamAddrs) == 0:
+		if r.dns.refreshInFlight {
+			if fallbackAddrs, ok := r.fallbackOnlyUpstreamsLocked(); ok {
+				return fallbackAddrs, 0, false, false, nil
+			}
+			return nil, 0, false, false, r.upstreamUnavailableErrLocked()
+		}
+		if !r.dns.refreshAt.IsZero() && now.Before(r.dns.refreshAt) {
+			if fallbackAddrs, ok := r.fallbackOnlyUpstreamsLocked(); ok {
+				return fallbackAddrs, 0, false, false, nil
+			}
+			return nil, 0, false, false, r.upstreamUnavailableErrLocked()
+		}
+		r.dns.refreshInFlight = true
+		needRefresh = true
+	case r.shouldRefreshUpstreams(now) && !r.dns.refreshInFlight:
+		r.dns.refreshInFlight = true
+		needRefresh = true
+	}
+
+	shouldProbe := !needRefresh &&
+		len(r.dns.upstreamAddrs) > 0 &&
+		r.dns.upstreamIndex > 0 &&
+		!r.dns.retryAt.IsZero() &&
+		!now.Before(r.dns.retryAt) &&
+		!r.dns.probeInFlight
+	if shouldProbe {
+		r.dns.probeInFlight = true
+		r.dns.retryAt = now.Add(dnsRetryInterval)
+	}
+
+	addrs := append([]string(nil), r.dns.upstreamAddrs...)
+	return addrs, r.dns.upstreamIndex, shouldProbe, needRefresh, nil
+}
+
+func (r *Router) buildUpstreamAddrs() ([]string, error) {
+	dnsIPs := []string{r.dns.upstreamDNS}
+	if r.dns.upstreamDNS == "" {
+		var err error
+		dnsIPs, err = r.dns.getDNSServer()
+		if err != nil {
+			slog.Error("get dns server", "error", err, "dns", dnsIPs)
+		}
+	}
+
+	addrs := make([]string, 0, len(dnsIPs)+1)
+	seen := make(map[string]struct{}, len(dnsIPs)+1)
+	appendAddr := func(ip string) {
+		if ip == "" || r.isServeIP(ip) {
+			return
+		}
+		addr := net.JoinHostPort(ip, "53")
+		if _, ok := seen[addr]; ok {
+			return
+		}
+		seen[addr] = struct{}{}
+		addrs = append(addrs, addr)
+	}
+
+	for _, ip := range dnsIPs {
+		appendAddr(ip)
+	}
+	appendAddr(r.dns.fallbackDNS)
+	if len(addrs) == 0 {
+		return nil, fmt.Errorf("no available upstream dns")
+	}
+
+	return addrs, nil
+}
+
+func (r *Router) shouldRefreshUpstreams(now time.Time) bool {
+	return r.dns.upstreamDNS == "" && !r.dns.refreshAt.IsZero() && !now.Before(r.dns.refreshAt)
+}
+
+func (r *Router) scheduleRefreshLocked(now time.Time) {
+	if r.dns.upstreamDNS == "" {
+		r.dns.refreshAt = now.Add(dnsRefreshTTL)
+	}
+}
+
+func (r *Router) applyUpstreamAddrsLocked(addrs []string, now time.Time) {
+	currentAddr := ""
+	retryAt := r.dns.retryAt
+	if len(r.dns.upstreamAddrs) > 0 && r.dns.upstreamIndex >= 0 && r.dns.upstreamIndex < len(r.dns.upstreamAddrs) {
+		currentAddr = r.dns.upstreamAddrs[r.dns.upstreamIndex]
+	}
+
+	r.dns.upstreamAddrs = addrs
+	r.dns.upstreamIndex = 0
+	if currentAddr != "" {
+		for i, addr := range addrs {
+			if addr == currentAddr {
+				r.dns.upstreamIndex = i
+				break
+			}
+		}
+	}
+	if r.dns.upstreamIndex == 0 {
+		r.dns.retryAt = time.Time{}
+	} else {
+		r.dns.retryAt = retryAt
+	}
+	r.dns.lastRefreshErr = nil
+	r.dns.refreshInFlight = false
+	r.dns.probeInFlight = false
+	r.scheduleRefreshLocked(now)
+	slog.Info("use upstream dns", "ips", addrs)
+}
+
+func (r *Router) finishUpstreamRefresh(now time.Time, addrs []string, err error) {
+	r.dns.Lock()
+	defer r.dns.Unlock()
+
+	if err != nil {
+		r.dns.refreshInFlight = false
+		r.dns.lastRefreshErr = err
+		r.scheduleRefreshLocked(now)
+		if len(r.dns.upstreamAddrs) > 0 {
+			slog.Warn("refresh upstream dns", "error", err)
+		}
+		return
+	}
+
+	r.applyUpstreamAddrsLocked(addrs, now)
+}
+
+func (r *Router) upstreamUnavailableErrLocked() error {
+	if r.dns.lastRefreshErr != nil {
+		return r.dns.lastRefreshErr
+	}
+	return fmt.Errorf("upstream dns unavailable")
+}
+
+func (r *Router) fallbackOnlyUpstreamsLocked() ([]string, bool) {
+	if r.dns.fallbackDNS == "" || r.isServeIP(r.dns.fallbackDNS) {
+		return nil, false
+	}
+	return []string{net.JoinHostPort(r.dns.fallbackDNS, "53")}, true
+}
+
+func (r *Router) exchangeWithRetry(req *dns.Msg, addr string) (*dns.Msg, error) {
+	resp, err := r.exchangeUDP(req, addr)
+	if err != nil {
+		return nil, err
+	}
+	if !resp.Truncated {
+		return resp, dnsResponseErr(resp)
+	}
+
+	resp, err = r.exchangeTCP(req, addr)
+	if err != nil {
+		return nil, err
+	}
+	return resp, dnsResponseErr(resp)
+}
+
+func dnsResponseErr(resp *dns.Msg) error {
+	if resp == nil {
+		return fmt.Errorf("empty dns response")
+	}
+	switch resp.Rcode {
+	case dns.RcodeServerFailure, dns.RcodeRefused, dns.RcodeNotImplemented:
+		return retryableDNSError{rcode: resp.Rcode}
+	default:
+		return nil
+	}
+}
+
+func (r *Router) exchangeUDP(req *dns.Msg, addr string) (*dns.Msg, error) {
+	msg := req.Copy()
+	if msg.IsEdns0() == nil {
+		msg.SetEdns0(dnsUDPSize, false)
+	}
+
+	client := dns.Client{
+		Net:     "udp",
+		Timeout: dnsTimeout,
+		UDPSize: dnsUDPSize,
+	}
+	resp, _, err := client.Exchange(msg, addr)
+	return resp, err
+}
+
+func (r *Router) exchangeTCP(req *dns.Msg, addr string) (*dns.Msg, error) {
+	client := dns.Client{
+		Net:     "tcp",
+		Timeout: dnsTimeout,
+	}
+	resp, _, err := client.Exchange(req.Copy(), addr)
+	return resp, err
+}
+
+func (r *Router) isServeIP(raw string) bool {
+	ip := net.ParseIP(strings.Trim(raw, "[]"))
+	if ip == nil {
+		return false
+	}
+
+	for _, serveIP := range r.dns.serveIPs {
+		if serveIP.Equal(ip) {
+			return true
+		}
+	}
+	return false
+}

router/ping.go

@@ -0,0 +1,58 @@
+package router
+
+import (
+	"fmt"
+	"log/slog"
+	"net/http"
+	"time"
+
+	"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(accessCacheKey(domain, port))
+	return ok
+}
+
+var pingClient = http.Client{
+	Timeout: 2 * time.Second,
+}
+
+func httpPing(key string) (bool, error) {
+	scheme, host, err := accessProbeTarget(key)
+	if err != nil {
+		return false, err
+	}
+
+	resp, err := pingClient.Head(scheme + "://" + host)
+	if err != nil {
+		slog.Warn("failed to ping", "error", err, "scheme", scheme, "host", host)
+		return false, nil
+	}
+	_ = resp.Body.Close()
+	return true, nil
+}
+
+func accessCacheKey(domain string, port uint16) string {
+	return fmt.Sprintf("%d:%s", port, domain)
+}
+
+func accessProbeTarget(key string) (string, string, error) {
+	switch {
+	case len(key) > 3 && key[:3] == "80:":
+		return "http", key[3:], nil
+	case len(key) > 4 && key[:4] == "443:":
+		return "https", key[4:], nil
+	default:
+		return "", "", fmt.Errorf("invalid access probe key %q", key)
+	}
+}

router/router.go

@@ -0,0 +1,148 @@
+package router
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"net"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	geoip2 "github.com/oschwald/geoip2-golang"
+	"github.com/sower-proxy/conns/relay"
+	"github.com/sower-proxy/deferlog/v2"
+	"github.com/sower-proxy/sower/pkg/dhcp"
+	"github.com/sower-proxy/sower/pkg/suffixtree"
+)
+
+type (
+	ProxyDialFn func(network, host string, port uint16) (net.Conn, error)
+	Router      struct {
+		BlockRule  *suffixtree.Node
+		DirectRule *suffixtree.Node
+		ProxyRule  *suffixtree.Node
+		ProxyDial  ProxyDialFn
+
+		dns struct {
+			upstreamDNS  string
+			fallbackDNS  string
+			serveIPs     []net.IP
+			getDNSServer func() ([]string, error)
+
+			sync.Mutex
+			upstreamAddrs   []string
+			upstreamIndex   int
+			refreshAt       time.Time
+			refreshInFlight bool
+			lastRefreshErr  error
+			retryAt         time.Time
+			probeInFlight   bool
+		}
+
+		country struct {
+			*geoip2.Reader
+			cidrs []*net.IPNet
+		}
+	}
+)
+
+var ErrBlocked = errors.New("route blocked")
+
+func NewRouter(serveIPs []string, upstreamDNS, fallbackDNS, mmdbFile string, proxyDial ProxyDialFn) *Router {
+	r := Router{
+		BlockRule:  suffixtree.NewNodeFromRules(),
+		DirectRule: suffixtree.NewNodeFromRules(),
+		ProxyRule:  suffixtree.NewNodeFromRules(),
+		ProxyDial:  proxyDial,
+	}
+
+	r.dns.upstreamDNS = upstreamDNS
+	r.dns.fallbackDNS = fallbackDNS
+	r.dns.getDNSServer = dhcp.GetDNSServer
+	for _, serveIP := range serveIPs {
+		if ip := net.ParseIP(serveIP); ip != nil {
+			r.dns.serveIPs = append(r.dns.serveIPs, ip)
+		}
+	}
+
+	mmdbFile = strings.TrimSpace(mmdbFile)
+	if mmdbFile != "" {
+		var err error
+		r.country.Reader, err = geoip2.Open(mmdbFile)
+		if err != nil {
+			slog.Warn("open geoip2 db", "error", err, "file", mmdbFile)
+		}
+	}
+
+	return &r
+}
+
+func (r *Router) AddCountryCIDRs(cidrs ...string) {
+	for _, cidr := range cidrs {
+		_, ipnet, err := net.ParseCIDR(cidr)
+		if err != nil {
+			slog.Error("failed to parse CIDR", "error", err, "cidr", cidr)
+			continue
+		}
+		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, "route handle", "domain", domain, "port", port, "took", time.Since(start))
+	}()
+
+	rc, err := r.Dial("tcp", domain, port)
+	if err != nil {
+		return err
+	}
+	defer rc.Close()
+
+	if err := relay.Relay(conn, rc); err != nil {
+		return fmt.Errorf("relay %s:%d: %w", domain, port, err)
+	}
+	return nil
+}
+
+func (r *Router) Dial(network, domain string, port uint16) (net.Conn, error) {
+	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, ErrBlocked
+	case r.DirectRule.Match(domain):
+		return r.directDial(network, addr)
+	case r.ProxyRule.Match(domain):
+		return r.proxyDial(network, domain, port)
+	case r.localSite(domain), r.isAccess(domain, port):
+		return r.directDial(network, addr)
+	default:
+		return r.proxyDial(network, domain, port)
+	}
+}
+
+func (r *Router) proxyDial(network, domain string, port uint16) (net.Conn, error) {
+	start := time.Now()
+	rc, err := r.ProxyDial(network, domain, port)
+	if err != nil {
+		return nil, fmt.Errorf("proxy dial %s:%d, spend (%s): %w", domain, port, time.Since(start), err)
+	}
+	return rc, nil
+}
+
+func (r *Router) directDial(network, addr string) (net.Conn, error) {
+	start := time.Now()
+	conn, err := net.DialTimeout(network, addr, 5*time.Second)
+	if err != nil {
+		return nil, fmt.Errorf("direct dial %s, spend (%s): %w", addr, time.Since(start), err)
+	}
+	return conn, nil
+}

router/util.go

@@ -0,0 +1,28 @@
+package router
+
+import (
+	"net"
+	"net/url"
+	"strconv"
+)
+
+func ParseHostPort(hostport string, u *url.URL) (string, uint16, error) {
+	host, port, err := net.SplitHostPort(hostport)
+	if err != nil {
+		if err.(*net.AddrError).Err == "missing port in address" {
+			switch u.Scheme {
+			case "http":
+				return hostport, 80, nil
+			case "https":
+				return hostport, 443, nil
+			}
+		}
+		return "", 0, err
+	}
+
+	portInt, err := strconv.ParseUint(port, 10, 16)
+	if err != nil {
+		return "", 0, err
+	}
+	return host, uint16(portInt), nil
+}

shadow/cipher.go

@@ -1,67 +0,0 @@
-package shadow
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-
-	"github.com/pkg/errors"
-	"golang.org/x/crypto/chacha20poly1305"
-)
-
-//go:generate stringer -type=cipherType $GOFILE
-type cipherType int
-
-const (
-	AES_128_GCM cipherType = iota
-	AES_192_GCM
-	AES_256_GCM
-	CHACHA20_IETF_POLY1305
-	XCHACHA20_IETF_POLY1305
-)
-
-func pickCipher(cipherType, password string) (cipher.AEAD, error) {
-	var blockSize int
-	switch cipherType {
-	case AES_128_GCM.String():
-		blockSize = 16
-	case AES_192_GCM.String():
-		blockSize = 24
-	case AES_256_GCM.String():
-		blockSize = 32
-
-	case CHACHA20_IETF_POLY1305.String():
-		return chacha20poly1305.New(genKey(password, 256))
-	case XCHACHA20_IETF_POLY1305.String():
-		return chacha20poly1305.NewX(genKey(password, 256))
-
-	default:
-		return nil, errors.New("do not support cipher type: " + cipherType)
-	}
-
-	// aes gcm
-	block, err := aes.NewCipher(genKey(password, blockSize))
-	if err != nil {
-		return nil, errors.Wrap(err, "password")
-	}
-
-	aead, err := cipher.NewGCM(block)
-	if err != nil {
-		return nil, errors.Wrap(err, AES_128_GCM.String())
-	}
-	return aead, nil
-}
-
-func genKey(filler string, size int) []byte {
-	res := make([]byte, size)
-	if filler == "" {
-		panic("password should not be empty")
-	}
-
-	fillerByte := []byte(filler)
-	length := len(fillerByte)
-	for i := 0; ; i++ {
-		if copy(res[i*length:], fillerByte) != length {
-			return res
-		}
-	}
-}

shadow/ciphertype_string.go

@@ -1,16 +0,0 @@
-// Code generated by "stringer -type=cipherType cipher.go"; DO NOT EDIT.
-
-package shadow
-
-import "strconv"
-
-const _cipherType_name = "AES_128_GCMAES_192_GCMAES_256_GCMCHACHA20_IETF_POLY1305XCHACHA20_IETF_POLY1305"
-
-var _cipherType_index = [...]uint8{0, 11, 22, 33, 55, 78}
-
-func (i cipherType) String() string {
-	if i < 0 || i >= cipherType(len(_cipherType_index)-1) {
-		return "cipherType(" + strconv.FormatInt(int64(i), 10) + ")"
-	}
-	return _cipherType_name[_cipherType_index[i]:_cipherType_index[i+1]]
-}

shadow/doc.go

@@ -1,4 +0,0 @@
-// Package shadow transter conn to be a crypto conn
-// support aead mode only
-// payload: [size](2+Overhead bytes) + [content](size+Overhead bytes)
-package shadow

shadow/shadow.go

@@ -1,111 +0,0 @@
-package shadow
-
-import (
-	"crypto/cipher"
-	"encoding/binary"
-	"io"
-	"math/rand"
-	"net"
-)
-
-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 dataSize, err
-}
-
-func Shadow(c net.Conn, cipher, password string) net.Conn {
-	aead, err := pickCipher(cipher, password)
-	if err != nil {
-		panic(err)
-	}
-
-	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,
-	}
-}
-
-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 +1,137 @@
+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 := io.ReadFull(r, 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 := io.ReadFull(r, req.METHODS); err != nil || n != len(req.METHODS) {
+		return err
+	}
+
+	return nil
+}
+
+func (r *authReq) IsValid() bool {
+	if r.VER != 5 || len(r.METHODS) == 0 {
+		return false
+	}
+	for _, method := range r.METHODS {
+		if method == 0 {
+			return true
+		}
+	}
+	return false
+}
+
+// 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 && r.RSV == 0
+}
+
+// 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 +1,161 @@
+package socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"net"
+	"strconv"
+
+	"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{}
+}
+
+const (
+	RepSucceeded            = 0x00
+	RepGeneralFailure       = 0x01
+	RepConnectionNotAllowed = 0x02
+)
+
+var (
+	noAuthResp = authResp{VER: 5, METHOD: 0}
+)
+
+func (s *Socks5) Unwrap(conn net.Conn) (net.Addr, error) {
+	addr, err := s.ReadRequest(conn)
+	if err != nil {
+		return nil, err
+	}
+	if err := s.WriteReply(conn, RepSucceeded); err != nil {
+		return nil, fmt.Errorf("write head: %w", err)
+	}
+	return addr, nil
+}
+
+func (s *Socks5) ReadRequest(conn net.Conn) (net.Addr, error) {
+	{ // auth
+		auth := new(authReq)
+		if err := auth.Fulfill(conn); err != nil || !auth.IsValid() {
+			return nil, fmt.Errorf("read auth head: %v, err: %v", auth, err)
+		}
+
+		if err := binary.Write(conn, binary.BigEndian, noAuthResp); err != nil {
+			return nil, fmt.Errorf("write auth: %w", err)
+		}
+	}
+
+	var addr addrType
+	{ // head
+		head := new(reqHead)
+		if err := binary.Read(conn, binary.BigEndian, head); err != nil || !head.IsValid() {
+			return nil, fmt.Errorf("read head: %v, err: %v", 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, fmt.Errorf("read target: %w", err)
+		}
+	}
+
+	return &AddrHead{
+		addrType: addr,
+	}, nil
+}
+
+func (s *Socks5) WriteReply(conn net.Conn, rep byte) error {
+	head := respHead{VER: 5, REP: rep, RSV: 0, ATYP: 1}
+	return binary.Write(conn, binary.BigEndian, head)
+}
+
+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 {
+	if len(tgtHost) > 255 {
+		return fmt.Errorf("target host too long: %d", len(tgtHost))
+	}
+
+	{ // auth
+		if err := binary.Write(conn, binary.BigEndian, &noAuthReq); err != nil {
+			return err
+		}
+
+		resp := &authResp{}
+		if err := binary.Read(conn, binary.BigEndian, resp); err != nil {
+			return err
+		}
+		if resp.VER != 5 || resp.METHOD != 0 {
+			return fmt.Errorf("unexpected auth response: %+v", resp)
+		}
+	}
+	{ // 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 n, err := conn.Write(buf.Bytes()); err != nil || n != len(buf.Bytes()) {
+			return fmt.Errorf("n: %d, err: %v", n, err)
+		}
+
+		head := reqHead{}
+		if err := binary.Read(conn, binary.BigEndian, &head); err != nil {
+			return err
+		}
+		if head.VER != 5 || head.RSV != 0 {
+			return fmt.Errorf("unexpected response head: %+v", head)
+		}
+		if head.CMD != 0 {
+			return fmt.Errorf("connect rejected, rep=%d", head.CMD)
+		}
+
+		var addr addrType
+		switch head.ATYP {
+		case 0x01:
+			addr = &addrTypeIPv4{}
+		case 0x03:
+			addr = &addrTypeDomain{}
+		case 0x04:
+			addr = &addrTypeIPv6{}
+		default:
+			return fmt.Errorf("invalid response ATYP: %d", head.ATYP)
+		}
+		if err := addr.Fulfill(conn); err != nil {
+			return fmt.Errorf("read response address: %w", err)
+		}
+	}
+
+	return nil
+}

transport/socks5/socks5_test.go

@@ -0,0 +1,124 @@
+package socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"net"
+	"testing"
+	"time"
+)
+
+type mockConn struct {
+	reader io.Reader
+	writes bytes.Buffer
+}
+
+func newMockConn(data []byte) *mockConn {
+	return &mockConn{reader: bytes.NewReader(data)}
+}
+
+func (c *mockConn) Read(p []byte) (int, error)       { return c.reader.Read(p) }
+func (c *mockConn) Write(p []byte) (int, error)      { return c.writes.Write(p) }
+func (c *mockConn) Close() error                     { return nil }
+func (c *mockConn) LocalAddr() net.Addr              { return dummyAddr("local") }
+func (c *mockConn) RemoteAddr() net.Addr             { return dummyAddr("remote") }
+func (c *mockConn) SetDeadline(time.Time) error      { return nil }
+func (c *mockConn) SetReadDeadline(time.Time) error  { return nil }
+func (c *mockConn) SetWriteDeadline(time.Time) error { return nil }
+
+type dummyAddr string
+
+func (a dummyAddr) Network() string { return "tcp" }
+func (a dummyAddr) String() string  { return string(a) }
+
+func TestUnwrapRejectsZeroMethodsWithoutPanic(t *testing.T) {
+	conn := newMockConn([]byte{0x05, 0x00})
+	if _, err := New().Unwrap(conn); err == nil {
+		t.Fatal("expected error for zero auth methods")
+	}
+}
+
+func TestUnwrapAcceptsNoAuthWhenNotFirstMethod(t *testing.T) {
+	req := []byte{
+		0x05, 0x02, 0x02, 0x00,
+		0x05, 0x01, 0x00, 0x03,
+		0x0b,
+	}
+	req = append(req, []byte("example.com")...)
+	req = append(req, 0x01, 0xbb)
+
+	addr, err := New().Unwrap(newMockConn(req))
+	if err != nil {
+		t.Fatalf("unwrap failed: %v", err)
+	}
+
+	host, port := addr.(*AddrHead).Addr()
+	if host != "example.com" || port != 443 {
+		t.Fatalf("unexpected addr: %s:%d", host, port)
+	}
+}
+
+func TestWrapRejectsAuthFailure(t *testing.T) {
+	server, client := net.Pipe()
+	defer server.Close()
+	defer client.Close()
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		buf := make([]byte, 3)
+		if _, err := io.ReadFull(server, buf); err != nil {
+			return
+		}
+		_, _ = server.Write([]byte{0x05, 0xff})
+	}()
+
+	if err := New().Wrap(client, "example.com", 443); err == nil {
+		t.Fatal("expected auth failure")
+	}
+	<-done
+}
+
+func TestWrapRejectsConnectFailure(t *testing.T) {
+	server, client := net.Pipe()
+	defer server.Close()
+	defer client.Close()
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+
+		auth := make([]byte, 3)
+		if _, err := io.ReadFull(server, auth); err != nil {
+			return
+		}
+		_, _ = server.Write([]byte{0x05, 0x00})
+
+		if _, err := io.ReadFull(server, make([]byte, 4)); err != nil {
+			return
+		}
+		var nameLen [1]byte
+		if _, err := io.ReadFull(server, nameLen[:]); err != nil {
+			return
+		}
+		if _, err := io.ReadFull(server, make([]byte, int(nameLen[0])+2)); err != nil {
+			return
+		}
+
+		resp := bytes.NewBuffer(nil)
+		_ = binary.Write(resp, binary.BigEndian, reqHead{VER: 5, CMD: 5, RSV: 0, ATYP: 1})
+		_, _ = server.Write(resp.Bytes())
+	}()
+
+	if err := New().Wrap(client, "example.com", 443); err == nil {
+		t.Fatal("expected connect failure")
+	}
+	<-done
+}
+
+func TestWrapRejectsTooLongHost(t *testing.T) {
+	if err := New().Wrap(newMockConn(nil), string(bytes.Repeat([]byte{'a'}, 256)), 443); err == nil {
+		t.Fatal("expected error for too long host")
+	}
+}

transport/sower/sower.go

@@ -0,0 +1,90 @@
+package sower
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+
+	"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.IndexByte(h.TgtAddr[:], 0)
+	if idx < 0 {
+		idx = len(h.TgtAddr)
+	}
+	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 := io.ReadFull(conn, buf); err != nil || n != headSize {
+		return nil, fmt.Errorf("n: %d, err: %v", n, err)
+	}
+
+	h := &Head{}
+	_ = binary.Read(bytes.NewReader(buf), binary.BigEndian, h)
+	switch h.Cmd {
+	case 0x80:
+	default:
+		return nil, fmt.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 {
+	if len(tgtHost) > maxDomainLength {
+		return fmt.Errorf("target host too long: %d", len(tgtHost))
+	}
+
+	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/sower/sower_test.go

@@ -0,0 +1,119 @@
+package sower
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"net"
+	"strings"
+	"testing"
+	"time"
+)
+
+type chunkConn struct {
+	reader io.Reader
+	writes bytes.Buffer
+}
+
+func newChunkConn(data []byte, chunkSize int) *chunkConn {
+	return &chunkConn{
+		reader: &io.LimitedReader{
+			R: &chunkReader{
+				data:  data,
+				chunk: chunkSize,
+			},
+			N: int64(len(data)),
+		},
+	}
+}
+
+func (c *chunkConn) Read(p []byte) (int, error)       { return c.reader.Read(p) }
+func (c *chunkConn) Write(p []byte) (int, error)      { return c.writes.Write(p) }
+func (c *chunkConn) Close() error                     { return nil }
+func (c *chunkConn) LocalAddr() net.Addr              { return dummyAddr("local") }
+func (c *chunkConn) RemoteAddr() net.Addr             { return dummyAddr("remote") }
+func (c *chunkConn) SetDeadline(time.Time) error      { return nil }
+func (c *chunkConn) SetReadDeadline(time.Time) error  { return nil }
+func (c *chunkConn) SetWriteDeadline(time.Time) error { return nil }
+
+type chunkReader struct {
+	data  []byte
+	chunk int
+	pos   int
+}
+
+func (r *chunkReader) Read(p []byte) (int, error) {
+	if r.pos >= len(r.data) {
+		return 0, io.EOF
+	}
+
+	n := r.chunk
+	if n > len(p) {
+		n = len(p)
+	}
+	remain := len(r.data) - r.pos
+	if n > remain {
+		n = remain
+	}
+	copy(p, r.data[r.pos:r.pos+n])
+	r.pos += n
+	return n, nil
+}
+
+type dummyAddr string
+
+func (a dummyAddr) Network() string { return "tcp" }
+func (a dummyAddr) String() string  { return string(a) }
+
+func TestWrapRejectsTooLongHost(t *testing.T) {
+	err := New("123").Wrap(newChunkConn(nil, 1), strings.Repeat("a", maxDomainLength+1), 443)
+	if err == nil {
+		t.Fatal("expected error for too long host")
+	}
+}
+
+func TestRoundTripWithMaxLengthHost(t *testing.T) {
+	host := strings.Repeat("a", maxDomainLength)
+	server, client := net.Pipe()
+	defer server.Close()
+	defer client.Close()
+
+	done := make(chan error, 1)
+	go func() {
+		done <- New("123").Wrap(client, host, 443)
+	}()
+
+	addr, err := New("123").Unwrap(server)
+	if err != nil {
+		t.Fatalf("unwrap failed: %v", err)
+	}
+	if got := addr.String(); got != net.JoinHostPort(host, "443") {
+		t.Fatalf("unexpected addr: %s", got)
+	}
+	if err := <-done; err != nil {
+		t.Fatalf("wrap failed: %v", err)
+	}
+}
+
+func TestUnwrapReadsFullHeader(t *testing.T) {
+	target := [maxDomainLength]byte{}
+	copy(target[:], "example.com")
+
+	buf := bytes.NewBuffer(nil)
+	if err := binary.Write(buf, binary.BigEndian, &Head{
+		Cmd:      0x80,
+		Checksum: sumChecksum(target, []byte("123")),
+		Port:     443,
+		TgtAddr:  target,
+	}); err != nil {
+		t.Fatalf("build header: %v", err)
+	}
+
+	addr, err := New("123").Unwrap(newChunkConn(buf.Bytes(), 7))
+	if err != nil {
+		t.Fatalf("unwrap failed: %v", err)
+	}
+	if got := addr.String(); got != "example.com:443" {
+		t.Fatalf("unexpected addr: %s", got)
+	}
+}

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 +1,41 @@
+package transport
+
+import (
+	"net"
+	"strings"
+	"testing"
+
+	"github.com/sower-proxy/conns/reread"
+	"github.com/sower-proxy/sower/transport/sower"
+	"github.com/sower-proxy/sower/transport/trojan"
+)
+
+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(reread.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 +1,213 @@
+package trojan
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+
+	"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)))
+}
+
+func (a *ipv4Addr) IsValid() bool {
+	return a.CRLF == [2]byte{0x0D, 0x0A}
+}
+
+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)))
+}
+
+func (a *ipv6Addr) IsValid() bool {
+	return a.CRLF == [2]byte{0x0D, 0x0A}
+}
+
+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 := io.ReadFull(r, buf); err != nil || n != 1 {
+		return errors.New("read domain length failed")
+	}
+
+	addrLen := int(buf[0])
+	buf = make([]byte, addrLen+4)
+	if n, err := io.ReadFull(r, buf); err != nil || n != addrLen+4 {
+		return fmt.Errorf("read domain: %w", err)
+	}
+
+	a.ADDR = string(buf[:addrLen])
+	a.PORT = uint16(buf[addrLen])<<8 + uint16(buf[addrLen+1])
+	a.CRLF = [2]byte{buf[addrLen+2], buf[addrLen+3]}
+	return nil
+}
+
+func (a *domain) IsValid() bool {
+	return a.CRLF == [2]byte{0x0D, 0x0A}
+}
+
+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)
+	if n, err := io.ReadFull(conn, buf); err != nil || n != headLen {
+		return nil, fmt.Errorf("n: %d, err: %v", n, err)
+	}
+
+	head := &staticHead{}
+	if err := binary.Read(bytes.NewBuffer(buf), binary.BigEndian, head); err != nil {
+		return nil, fmt.Errorf("read head: %w", err)
+	}
+
+	if !bytes.Equal(head.Passwd[:], []byte(t.headPasswd)) {
+		return nil, errors.New("auth fail")
+	}
+	if head.CRLF != [2]byte{0x0D, 0x0A} {
+		return nil, errors.New("invalid CRLF")
+	}
+	if head.CMD != 0x01 {
+		return nil, fmt.Errorf("invalid CMD: %d", head.CMD)
+	}
+	switch head.ATYP {
+	case 0x01: // ipv4
+		addr := &ipv4Addr{}
+		err := binary.Read(conn, binary.BigEndian, addr)
+		if err != nil {
+			return nil, fmt.Errorf("read addr: %w", err)
+		}
+		if !addr.IsValid() {
+			return nil, errors.New("invalid CRLF")
+		}
+		return addr, nil
+
+	case 0x04: // ipv6
+		addr := &ipv6Addr{}
+		err := binary.Read(conn, binary.BigEndian, addr)
+		if err != nil {
+			return nil, fmt.Errorf("read addr: %w", err)
+		}
+		if !addr.IsValid() {
+			return nil, errors.New("invalid CRLF")
+		}
+		return addr, nil
+
+	case 0x03: // domain
+		addr := &domain{}
+		err := addr.Fulfill(conn)
+		if err != nil {
+			return nil, fmt.Errorf("read addr: %w", err)
+		}
+		if !addr.IsValid() {
+			return nil, errors.New("invalid CRLF")
+		}
+		return addr, nil
+
+	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:
+		if len(tgtHost) > 255 {
+			return fmt.Errorf("target host too long: %d", len(tgtHost))
+		}
+		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 fmt.Errorf("n: %d, err: %v", n, err)
+	}
+	return nil
+}

transport/trojan/trojan_test.go

@@ -0,0 +1,112 @@
+package trojan
+
+import (
+	"bytes"
+	"io"
+	"net"
+	"strings"
+	"testing"
+	"time"
+)
+
+type chunkConn struct {
+	reader io.Reader
+	writes bytes.Buffer
+}
+
+func newChunkConn(data []byte, chunkSize int) *chunkConn {
+	return &chunkConn{
+		reader: &chunkReader{
+			data:  data,
+			chunk: chunkSize,
+		},
+	}
+}
+
+func (c *chunkConn) Read(p []byte) (int, error)       { return c.reader.Read(p) }
+func (c *chunkConn) Write(p []byte) (int, error)      { return c.writes.Write(p) }
+func (c *chunkConn) Close() error                     { return nil }
+func (c *chunkConn) LocalAddr() net.Addr              { return dummyAddr("local") }
+func (c *chunkConn) RemoteAddr() net.Addr             { return dummyAddr("remote") }
+func (c *chunkConn) SetDeadline(time.Time) error      { return nil }
+func (c *chunkConn) SetReadDeadline(time.Time) error  { return nil }
+func (c *chunkConn) SetWriteDeadline(time.Time) error { return nil }
+
+type chunkReader struct {
+	data  []byte
+	chunk int
+	pos   int
+}
+
+func (r *chunkReader) Read(p []byte) (int, error) {
+	if r.pos >= len(r.data) {
+		return 0, io.EOF
+	}
+
+	n := r.chunk
+	if n > len(p) {
+		n = len(p)
+	}
+	remain := len(r.data) - r.pos
+	if n > remain {
+		n = remain
+	}
+	copy(p, r.data[r.pos:r.pos+n])
+	r.pos += n
+	return n, nil
+}
+
+type dummyAddr string
+
+func (a dummyAddr) Network() string { return "tcp" }
+func (a dummyAddr) String() string  { return string(a) }
+
+func TestWrapRejectsTooLongHost(t *testing.T) {
+	err := New("123").Wrap(newChunkConn(nil, 1), strings.Repeat("a", 256), 443)
+	if err == nil {
+		t.Fatal("expected error for too long host")
+	}
+}
+
+func TestUnwrapReadsFullHeader(t *testing.T) {
+	conn := newChunkConn(nil, 1)
+	if err := New("123").Wrap(conn, "example.com", 443); err != nil {
+		t.Fatalf("wrap failed: %v", err)
+	}
+
+	addr, err := New("123").Unwrap(newChunkConn(conn.writes.Bytes(), 5))
+	if err != nil {
+		t.Fatalf("unwrap failed: %v", err)
+	}
+	if got := addr.String(); got != "example.com:443" {
+		t.Fatalf("unexpected addr: %s", got)
+	}
+}
+
+func TestUnwrapRejectsInvalidCommand(t *testing.T) {
+	conn := newChunkConn(nil, 1)
+	if err := New("123").Wrap(conn, "example.com", 443); err != nil {
+		t.Fatalf("wrap failed: %v", err)
+	}
+
+	data := append([]byte(nil), conn.writes.Bytes()...)
+	data[58] = 0x03
+
+	if _, err := New("123").Unwrap(newChunkConn(data, len(data))); err == nil {
+		t.Fatal("expected invalid command error")
+	}
+}
+
+func TestUnwrapRejectsInvalidCRLF(t *testing.T) {
+	conn := newChunkConn(nil, 1)
+	if err := New("123").Wrap(conn, "example.com", 443); err != nil {
+		t.Fatalf("wrap failed: %v", err)
+	}
+
+	data := append([]byte(nil), conn.writes.Bytes()...)
+	data[len(data)-1] = 0x00
+
+	if _, err := New("123").Unwrap(newChunkConn(data, len(data))); err == nil {
+		t.Fatal("expected invalid CRLF error")
+	}
+}

util/dhcp.go

@@ -1,91 +0,0 @@
-package util
-
-import (
-	"math/rand"
-	"net"
-	"runtime"
-
-	"github.com/golang/glog"
-	"github.com/wweir/netboot/dhcp4"
-)
-
-var xid = make([]byte, 4)
-
-func GetDefaultDNSServer() string {
-	pack := &dhcp4.Packet{
-		Type:      dhcp4.MsgDiscover,
-		Broadcast: true,
-	}
-	options := map[dhcp4.Option][]byte{
-		dhcp4.OptRequestedOptions: []byte{byte(dhcp4.OptDNSServers)},
-	}
-
-	NewConn := dhcp4.NewConn
-	if runtime.GOOS == "linux" {
-		NewConn = dhcp4.NewSnooperConn
-	}
-
-	ifaces := mustGetInterfaces()
-	for _, iface := range ifaces {
-		conn, err := NewConn(iface.IP.String() + ":68")
-		if err != nil { // maybe in use
-			glog.V(1).Infoln(err)
-			continue
-		}
-		defer conn.Close()
-
-		rand.Read(xid)
-		pack.TransactionID = xid
-		pack.HardwareAddr = iface.Interface.HardwareAddr
-		options[dhcp4.OptClientIdentifier] = iface.Interface.HardwareAddr
-		pack.Options = dhcp4.Options(options)
-
-		if err := conn.SendDHCP(pack, iface.Interface); err != nil {
-			glog.Errorln(err)
-			continue
-		}
-
-		pack, _, err = conn.RecvDHCP()
-		if err != nil {
-			glog.Errorln(err)
-			continue
-		}
-
-		ips, err := pack.Options.IPs(dhcp4.OptDNSServers)
-		if err != nil {
-			glog.Errorln(err)
-			continue
-		}
-		return ips[0].String() // if len(ips) == 0, err should not be wrong size
-	}
-	return ""
-}
-
-type netIface struct {
-	*net.Interface
-	net.Addr
-	net.IP
-}
-
-func mustGetInterfaces() []*netIface {
-	ifaces, err := net.Interfaces()
-	if err != nil {
-		glog.Fatalln(err)
-	}
-
-	v4Iface := make([]*netIface, 0, len(ifaces))
-	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 {
-				v4Iface = append(v4Iface, &netIface{&ifaces[i], addr, ip})
-				break
-			}
-		}
-	}
-	return v4Iface
-}

util/dhcp_test.go

@@ -1,20 +0,0 @@
-package util
-
-import "testing"
-
-func TestGetDefaultDNSServer(t *testing.T) {
-	t.Skip("skip for some enviroment not support dhcp")
-
-	tests := []struct {
-		name string
-	}{{
-		"",
-	}}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := GetDefaultDNSServer(); got == "" {
-				t.Errorf("GetDefaultDNSServer() return empty")
-			}
-		})
-	}
-}

util/http_ping.go

@@ -1,131 +0,0 @@
-package util
-
-import (
-	"bytes"
-	"crypto/tls"
-	"encoding/binary"
-	"io"
-	"net"
-	"time"
-)
-
-// HTTPPing try connect to a http(s) server with domain though the http addr
-func HTTPPing(viaHost, domain string, port Port, timeout time.Duration) (err error) {
-	conn, err := net.DialTimeout("tcp", port.JoinAddr(viaHost), timeout)
-	if err != nil {
-		return err
-	}
-	defer conn.Close()
-
-	conn.SetDeadline(time.Now().Add(timeout))
-	if _, err = conn.Write(port.pingMsg(domain)); err != nil {
-		return err
-	}
-
-	// err -> nil:		read something succ
-	// err -> io.EOF:	no such domain or connection refused
-	// err -> timeout:	tcp package has been dropped
-	_, err = conn.Read(make([]byte, 1))
-	if err == io.EOF && viaHost == domain {
-		return nil
-	}
-	return err
-}
-
-// Port ==========================
-type Port uint16
-
-const (
-	Http Port = iota
-	Https
-)
-
-func (p Port) JoinAddr(addr string) string {
-	switch p {
-	case Http:
-		return addr + ":80"
-	case Https:
-		return addr + ":443"
-	default:
-		panic("invalid port")
-	}
-}
-
-func (p Port) pingMsg(domain string) []byte {
-	switch p {
-	case Http:
-		return []byte("TRACE / HTTP/1.1\r\nHost: " + domain + "\r\n\r\n")
-	case Https:
-		return NewClientHelloSNIMsg(domain)
-	default:
-		panic("invalid port")
-	}
-}
-
-// SNI ==========================
-type clientHelloSNI struct {
-	ContentType uint8
-	Version     uint16
-	Length      uint16
-	handshakeProtocol
-}
-type handshakeProtocol struct {
-	HandshakeType            uint8
-	LengthExpand             uint8
-	Length                   uint16
-	Version                  uint16
-	Random                   [32]byte
-	SessionIDLength          uint8
-	CipherSuitesLength       uint16
-	CipherSuite              uint16
-	CompressionMethodsLength uint8
-	CompressionMethod        uint8
-	ExtensionsLength         uint16
-	extensionServerName
-}
-type extensionServerName struct {
-	Type   uint16
-	Length uint16
-	serverNameIndicationExtension
-}
-type serverNameIndicationExtension struct {
-	ServerNameListlength uint16
-	ServerNameType       uint8
-	ServerNamelength     uint16
-	// ServerName        []byte // Disable for fix length
-}
-
-func NewClientHelloSNIMsg(domain string) []byte {
-	length := uint16(len(domain))
-	msg := &clientHelloSNI{
-		ContentType: 0x16,   // Content Type: Handshake (22)
-		Version:     0x0301, // Version: TLS 1.0 (0x0301)
-		Length:      length + 56,
-		handshakeProtocol: handshakeProtocol{
-			HandshakeType:            0x01, // Handshake Type: Client Hello (1)
-			Length:                   length + 52,
-			Version:                  0x0303,     // Version: TLS 1.2 (0x0303)
-			Random:                   [32]byte{}, // [32]byte{},
-			SessionIDLength:          0x0,        // Session ID Length: 0
-			CipherSuitesLength:       2,          // Cipher Suites Length: 84
-			CipherSuite:              tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
-			CompressionMethodsLength: 1,    // Compression Methods Length: 1
-			CompressionMethod:        0x00, // Compression null
-			ExtensionsLength:         length + 9,
-			extensionServerName: extensionServerName{
-				Type:   0x0000, // Type: server_name (0)
-				Length: length + 5,
-				serverNameIndicationExtension: serverNameIndicationExtension{
-					ServerNameListlength: length + 3,
-					ServerNameType:       0x00, // Server Name Type: host_name (0)
-					ServerNamelength:     length,
-				},
-			},
-		},
-	}
-
-	buf := bytes.NewBuffer(make([]byte, 0, length+61))
-	binary.Write(buf, binary.BigEndian, msg)
-	buf.WriteString(domain)
-	return buf.Bytes()
-}

util/rev_sec.go

@@ -1,52 +0,0 @@
-package util
-
-import (
-	"sort"
-	"strings"
-)
-
-type ReverseSecSlice struct {
-	sort.StringSlice
-}
-
-func NewReverseSecSlice(a []string) *ReverseSecSlice {
-	return &ReverseSecSlice{sort.StringSlice(a)}
-}
-
-func (p *ReverseSecSlice) Sort() *ReverseSecSlice {
-	sort.Sort(p)
-	return p
-}
-func (p *ReverseSecSlice) Uniq() []string {
-	olds := []string(p.StringSlice)
-
-	last := ""
-	strs := make([]string, 0, len(olds))
-	for _, str := range olds {
-		if str != last {
-			strs = append(strs, str)
-		}
-		last = str
-	}
-	return strs
-}
-
-func (p *ReverseSecSlice) Less(i, j int) bool {
-	secsI := strings.Split(p.StringSlice[i], ".")
-	secsJ := strings.Split(p.StringSlice[j], ".")
-
-	lenI := len(secsI) - 1
-	lenJ := len(secsJ) - 1
-	length := lenI
-	if lenI > lenJ {
-		length = lenJ
-	}
-
-	for idx := 0; idx <= length; idx++ {
-		if secsI[lenI-idx] == secsJ[lenJ-idx] {
-			continue
-		}
-		return secsI[lenI-idx] < secsJ[lenJ-idx]
-	}
-	return lenI < lenJ
-}

util/rev_sec_test.go

@@ -1,65 +0,0 @@
-package util
-
-import (
-	"sort"
-	"testing"
-)
-
-func TestReverseSecSlice_Less(t *testing.T) {
-	type fields struct {
-		StringSlice sort.StringSlice
-	}
-	type args struct {
-		i int
-		j int
-	}
-	slice := fields{sort.StringSlice([]string{
-		"a.b.c",
-		"a.b.c",
-		"d.b.c",
-		"d.a.b.c",
-		"",
-		"",
-	})}
-	tests := []struct {
-		name   string
-		fields fields
-		args   args
-		want   bool
-	}{{
-		name:   "equal",
-		fields: slice,
-		args:   args{0, 1},
-		want:   false,
-	}, {
-		name:   "less",
-		fields: slice,
-		args:   args{0, 2},
-		want:   true,
-	}, {
-		name:   "length",
-		fields: slice,
-		args:   args{0, 3},
-		want:   true,
-	}, {
-		name:   "single_empty",
-		fields: slice,
-		args:   args{0, 4},
-		want:   false,
-	}, {
-		name:   "all_empty",
-		fields: slice,
-		args:   args{4, 5},
-		want:   false,
-	}}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			p := &ReverseSecSlice{
-				StringSlice: tt.fields.StringSlice,
-			}
-			if got := p.Less(tt.args.i, tt.args.j); got != tt.want {
-				t.Errorf("ReverseSecSlice.Less() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}

util/suffix_tree.go

@@ -1,101 +0,0 @@
-package util
-
-import (
-	"strings"
-	"sync"
-)
-
-type Node struct {
-	node
-	sep string
-	*sync.RWMutex
-}
-type node struct {
-	node map[string]*node
-}
-
-func NewNode(sep string) *Node {
-	return &Node{node{node: map[string]*node{}}, sep, &sync.RWMutex{}}
-}
-func NewNodeFromRules(sep string, rules ...string) *Node {
-	n := NewNode(sep)
-	for i := range rules {
-		n.Add(rules[i])
-	}
-	return n
-}
-
-func (n *Node) String() string {
-	n.RLock()
-	defer n.RUnlock()
-	return n.string("", "     ")
-}
-func (n *node) string(prefix, indent string) (out string) {
-	for key, val := range n.node {
-		out += prefix + 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.Lock()
-	defer n.Unlock()
-	n.add(strings.Split(n.trim(item), n.sep))
-}
-func (n *node) add(secs []string) {
-	length := len(secs)
-	switch length {
-	case 0:
-		return
-	case 1:
-		n.node[secs[length-1]] = &node{node: map[string]*node{"": &node{}}}
-	default:
-		sec := secs[length-1]
-		if sec == "**" {
-			sec = "*"
-		}
-
-		subNode, ok := n.node[sec]
-		if !ok {
-			subNode = &node{node: map[string]*node{}}
-			n.node[sec] = subNode
-		}
-		subNode.add(secs[:length-1])
-	}
-}
-
-func (n *Node) Match(item string) bool {
-	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 _, ok := n.node[""]; ok {
-			return true
-		}
-		if _, ok := n.node["**"]; ok {
-			return true
-		}
-		if _, ok := n.node["*"]; ok {
-			return !fuzzNode
-		}
-		return false
-	}
-
-	if n, ok := n.node[secs[length-1]]; ok {
-		return n.matchSecs(secs[:length-1], false)
-	}
-	if n, ok := n.node["*"]; ok {
-		return n.matchSecs(secs[:length-1], true)
-	}
-	if _, ok := n.node["**"]; ok {
-		return true
-	}
-
-	return false
-}

util/suffix_tree_test.go

@@ -1,77 +0,0 @@
-package util
-
-import (
-	"testing"
-)
-
-func TestNode_Match(t *testing.T) {
-	type test struct {
-		arg  string
-		want bool
-	}
-	tests := []struct {
-		name  string
-		node  *Node
-		tests []test
-	}{{
-		"simple",
-		NewNodeFromRules(".", "a.wweir.cc", "b.wweir.cc"),
-		[]test{
-			{"a.wweir.cc", true},
-			{"b.wweir.cc", true},
-		},
-	}, {
-		"parent",
-		NewNodeFromRules(".", "wweir.cc", "a.wweir.cc"),
-		[]test{
-			{"wweir.cc", true},
-			{"a.wweir.cc", true},
-			{"b.wweir.cc", false},
-		},
-	}, {
-		"fuzz1",
-		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",
-		NewNodeFromRules(".", "a.*.cc"),
-		[]test{
-			{"wweir.cc", false},
-			{"a.wweir.cc", true},
-			{"b.wweir.cc", false},
-		},
-	}, {
-		"fuzz3",
-		NewNodeFromRules(".", "*.*.cc", "iamp.*.*"),
-		[]test{
-			{"wweir.cc", false},
-			{"a.wweir.cc", true},
-			{"b.wweir.cc", true},
-			{"iamp.wweir.cc", true},
-		},
-	}, {
-		"fuzz4",
-		NewNodeFromRules(".", "**.cc", "a.**.com"),
-		[]test{
-			{"wweir.cc", true},
-			{"a.wweir.cc", true},
-			{"a.b.wweir.cc", true},
-			{"a.wweir.com", true},
-			{"b.wweir.com", false},
-		},
-	}}
-	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)
-				}
-			}
-		})
-	}
-}

util/tee_conn.go

@@ -1,37 +0,0 @@
-package util
-
-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
-}

util/with_timeout.go

@@ -1,23 +0,0 @@
-package util
-
-import (
-	"errors"
-	"time"
-)
-
-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())
-	}
-}