docs: clarify transparent https routing flow

fix: preserve tls client hello in transparent https proxy
refactor: centralize proxy service startup handling
2026-10-19 16:14:33 +00:00 · 2026-03-31 11:53:10 +08:00 · 2026-03-31 11:52:56 +08:00 · 2026-03-31 10:14:20 +08:00 · 2026-03-31 10:14:15 +08:00 · 2026-03-31 07:46:32 +08:00
50 changed files with 4713 additions and 671 deletions
@@ -10,9 +10,10 @@ remote {
 dns {
    disable = false
    # 监听该 IP 的 UDP(53)、TCP(80、443) 端口，DNS 会将请求导向这个地址
-    serve_ips = ["127.0.0.1"]
+    serve = "127.0.0.1"
+    # serve6 = "<ipv6>"
    # 监听的网络接口
-    serve_iface = "lo"
+    # serve_iface = "lo"
    # 必填，优先使用 DHCP 中的 DNS 服务器，如果没有则使用该地址
    fallback = "223.5.5.5"
 }
@@ -96,4 +97,4 @@ router "country" {
        "224.0.0.0/4",
        "fe80::/10",
    ]
-}
+}
@@ -5,7 +5,7 @@ After=network.target
 [Service]
 Type=simple
 WorkingDirectory=/etc/sower
-ExecStart=/usr/local/bin/sower -f /etc/sower/sower.hcl
+ExecStart=/usr/local/bin/sower -c /etc/sower/sower.hcl
 Restart=on-failure
 RestartSec=1min

@@ -8,7 +8,8 @@ password = "I_am_Passw0rd"
 [dns]
 disable = false
 # 监听该 IP 的 UDP(53)、TCP(80、443) 端口，DNS 会将请求导向这个地址
-serve_ips = ["127.0.0.1"]
+serve = "127.0.0.1"
+# serve6 = <ipv6>
 # 监听的网络接口
 # serve_iface = "lo"

@@ -8,10 +8,10 @@ remote: # 远程、上游连接方式
 dns:
  disable: false
  # 监听该 IP 的 UDP(53)、TCP(80、443) 端口，DNS 会将请求导向这个地址
-  serve_ips: 
-    - "127.0.0.1"
+  serve: "127.0.0.1"
+  # serve6: <ipv6>
  # 监听的网络接口
-  serve_iface: "lo"
+  # serve_iface: "lo"
  # 必填，优先使用 DHCP 中的 DNS 服务器，如果没有则使用该地址
  fallback: "223.5.5.5"

@@ -0,0 +1,132 @@
+## 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. 设计调整需同步更新 `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，推进开始、结束一个阶段时更新文档记录
+
+## Coding Agent Rules
+
+1. 代码变更后使用语言的格式化、lint 工具检查代码质量
+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. 代码简洁，避免过早设计和不必要抽象
+8. 英文注释，仅注释复杂逻辑
+9. git 使用 commitizen 规范，英文提交信息
+10. 按需构建单元测试、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})))
+```
@@ -0,0 +1,113 @@
+# 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. Resolve the effective upstream DNS server, falling back to the configured fallback DNS when needed.
+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.
+7. Start enabled local listeners for `udp/53`, `tcp/80`, `tcp/443`, and `tcp/1080`.
+8. For DNS requests, return local proxy IPs for proxy-routed domains and query upstream DNS for direct domains.
+9. For HTTP traffic, parse the target host from the request line. For HTTPS transparent traffic, peek the TLS ClientHello to extract SNI without terminating TLS locally. For SOCKS5 traffic, read the SOCKS5 target address. Apply routing rules and either dial directly or wrap traffic in the configured upstream transport.
+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.
+- 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 gzip-compressed HTTP sources.
+- 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.
+
+## 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)
@@ -0,0 +1 @@
+AGENTS.md
@@ -22,4 +22,4 @@ sowerd:
 		-o sowerd ./cmd/sowerd

 clean:
-	rm -f sower sowerd sower.exe sowerd.exe
+	rm -f sower sowerd sower.exe sowerd.exe
@@ -1,12 +1,12 @@
 # sower

-[![GitHub release](http://img.shields.io/github/release/wweir/sower.svg?style=popout)](https://github.com/wweir/sower/releases)
-[![Actions Status](https://github.com/wweir/sower/workflows/Go/badge.svg)](https://github.com/wweir/sower/actions)
-[![GitHub issue](https://img.shields.io/github/issues/wweir/sower.svg?style=popout)](https://github.com/wweir/sower/issues)
-[![GitHub star](https://img.shields.io/github/stars/wweir/sower.svg?style=popout)](https://github.com/wweir/sower/stargazers)
-[![GitHub license](https://img.shields.io/github/license/wweir/sower.svg?style=popout)](LICENSE)
+[![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)

-中文介绍见 [Wiki](https://github.com/wweir/sower/wiki)
+中文介绍见 [Wiki](https://github.com/sower-proxy/sower/wiki)

 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.

@@ -22,46 +22,45 @@ _If you want to use sower as a secondary proxy to provide intelligent routing, y

 On the server-side, sowerd runs just like a web server proxy. It will bind two ports `80` / `443`.

+`sowerd` validates its configuration at startup, redacts secrets from logs, and exits immediately if `80` / `443` listeners cannot be established.
+
+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.
+
 You can use your own certificate or the certificate automatically applied for by sowerd from [`Let's Encrypt`](https://letsencrypt.org/).

+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
-   ```
+    ```shell
+    # sowerd -password XXX -fake_site 127.0.0.1:8080
+    ```

-2. Install as a systemd service
+2. Install as a systemd service interactively

-   ```service
-   [Unit]
-   Description=sower server service
-   After=network.target
+    ```shell
+    sudo sowerd -i
+    ```

-   [Service]
-   Type=simple
-   ExecStart=/usr/local/bin/sowerd
-   Environment="FAKE_SITE=127.0.0.1:8080"
-   Environment="PASSWORD=XXX"
-
-   [Install]
-   WantedBy=multi-user.target
-   ```
+    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. [Here](https://github.com/wweir/sower/wiki/sower.hcl) is a usable example in China.
+A config file is required on the sower client side. [Here](https://github.com/sower-proxy/sower/wiki/sower.hcl) is a usable example in China.

 `Sower` will bind 4 ports by default with root permission. They are: `udp(53)` / `tcp(80)` / `tcp(443)` / `tcp(1080)`.

+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`.
+
 After doing the next three steps, you can enjoy the intelligent transparent proxy solution:

 1. Run the command with root permission:

-   ```shell
-   # sower -f sower.hcl
-   ```
+    ```shell
+    # sower -f sower.hcl
+    ```

 2. Change your DNS server to `127.0.0.1`.

@@ -70,3 +69,5 @@ After doing the next three steps, you can enjoy the intelligent transparent prox
 ## Architecture

 ![Architecture diagram](./sower.drawio.svg)
+
+Detailed architecture and runtime design notes are in [ARCHITECTURE.md](./ARCHITECTURE.md).
@@ -3,81 +3,62 @@ package main
 import (
 	"bufio"
 	"compress/gzip"
+	"context"
+	stderrors "errors"
+	"fmt"
 	"io"
+	"log/slog"
 	"net"
 	"net/http"
 	"os"
+	"os/signal"
 	"runtime"
 	"strconv"
 	"strings"
+	"syscall"
 	"time"

 	"github.com/cristalhq/aconfig"
 	"github.com/cristalhq/aconfig/aconfighcl"
 	"github.com/cristalhq/aconfig/aconfigtoml"
 	"github.com/cristalhq/aconfig/aconfigyaml"
+	"github.com/lmittmann/tint"
 	"github.com/miekg/dns"
 	"github.com/pkg/errors"
-	"github.com/sower-proxy/deferlog/log"
-	"github.com/wweir/sower/pkg/suffixtree"
-	"github.com/wweir/sower/router"
+	"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 = struct {
-		Debug bool `default:"false" usage:"debug mode"`
-
-		Remote struct {
-			Type     string `default:"sower" required:"true" usage:"option: sower/trojan/socks5"`
-			Addr     string `required:"true" usage:"proxy address, eg: proxy.com/127.0.0.1:7890"`
-			Password string `usage:"remote proxy password"`
-		}
-
-		DNS struct {
-			Disable    bool   `default:"false" usage:"disable DNS proxy"`
-			Serve      string `usage:"dns server ip"`
-			Serve6     string `usage:"dns server ipv6, eg: ::1"`
-			ServeIface string `usage:"use the IP in the net interface, if serve ip not setted. eg: eth0"`
-			Fallback   string `default:"223.5.5.5" required:"true" usage:"fallback dns server"`
-		}
-		Socks5 struct {
-			Disable bool   `default:"false" usage:"disable sock5 proxy"`
-			Addr    string `default:"127.0.0.1:1080" usage:"socks5 listen address"`
-		} `flag:"socks5"`
-
-		Router struct {
-			Block struct {
-				File       string   `usage:"block list file, local file or remote"`
-				FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
-				Rules      []string `usage:"block list rules"`
-			}
-			Direct struct {
-				File       string   `usage:"direct list file, local file or remote"`
-				FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
-				Rules      []string `usage:"direct list rules"`
-			}
-			Proxy struct {
-				File       string   `usage:"proxy list file, local file or remote"`
-				FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
-				Rules      []string `usage:"proxy list rules"`
-			}
-
-			Country struct {
-				MMDB       string   `usage:"mmdb file"`
-				File       string   `usage:"CIDR block list file, local file or remote"`
-				FilePrefix string   `default:"" usage:"parsed as '<prefix>line_text'"`
-				Rules      []string `usage:"CIDR list rules"`
-			}
-		}
-	}{}
+	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: true,
-		FileFlag:           "f",
+		AllowUnknownFields: false,
+		FileFlag:           "c",
+		Files: []string{
+			"sower.hcl",
+			"sower.toml",
+			"sower.yaml",
+			"sower.yml",
+			"/etc/sower/sower.hcl",
+			"/etc/sower/sower.toml",
+			"/etc/sower/sower.yaml",
+			"/etc/sower/sower.yml",
+		},
 		FileDecoders: map[string]aconfig.FileDecoder{
 			".yml":  aconfigyaml.New(),
 			".yaml": aconfigyaml.New(),
@@ -85,56 +66,55 @@ func init() {
 			".hcl":  aconfighcl.New(),
 		},
 	}).Load(); err != nil {
-		log.Fatal().Err(err).
-			Interface("config", conf).
-			Msg("Load config")
+		slog.Error("load config", "error", err, "config", conf)
+		os.Exit(1)
 	}

-	if conf.DNS.ServeIface != "" {
-		iface, err := net.InterfaceByName(conf.DNS.ServeIface)
-		log.DebugFatal(err).Str("iface", conf.DNS.ServeIface).Msg("get iface")
-		addrs, err := iface.Addrs()
-		log.InfoFatal(err).Str("iface", conf.DNS.ServeIface).Msg("get iface addrs")
-		for _, addr := range addrs {
-			ip, _, err := net.ParseCIDR(addr.String())
-			log.InfoFatal(err).Str("iface", conf.DNS.ServeIface).
-				Msg("parse iface addr: " + addr.String())
-
-			if ip.To4() != nil { // ipv4
-				if conf.DNS.Serve == "" {
-					conf.DNS.Serve = ip.String()
-				}
-			} else if ip.IsGlobalUnicast() { // ipv6 must be global unicast
-				if conf.DNS.Serve6 == "" {
-					conf.DNS.Serve6 = ip.String()
-				}
-			}
-		}
+	if err := conf.Validate(); err != nil {
+		slog.Error("validate config", "error", err)
+		os.Exit(1)
 	}
-
-	if !conf.DNS.Disable && conf.DNS.Serve == "" {
-		log.Fatal().Msg("dns serve ip and serve inteface not setted")
-	}
-
-	conf.Router.Direct.Rules = append(conf.Router.Direct.Rules,
-		conf.Remote.Addr, "**.in-addr.arpa", "**.ip6.arpa")
-	log.Info().
-		Str("version", version).
-		Str("date", date).
-		Interface("config", conf).
-		Msg("Starting")
+	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() {
-	proxyDial := GenProxyDial(conf.Remote.Type, conf.Remote.Addr, conf.Remote.Password)
-	r := router.NewRouter(conf.DNS.Serve, conf.DNS.Fallback, conf.Router.Country.MMDB, proxyDial)
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	upstreamDNS := conf.DNS.Upstream
+	if upstreamDNS == "" {
+		upstreamDNS = conf.DNS.Fallback
+	}
+	proxyDial, err := GenProxyDial(conf.Remote.Type, conf.Remote.Addr, conf.Remote.Password, upstreamDNS, upstreamtls.Options{
+		ServerName:         conf.Remote.TLS.ServerName,
+		ClientHello:        conf.Remote.TLS.ClientHello,
+		InsecureSkipVerify: conf.Remote.TLS.InsecureSkipVerify,
+	})
+	if err != nil {
+		slog.Error("build proxy dialer", "error", err)
+		os.Exit(1)
+	}
+	r := router.NewRouter([]string{conf.DNS.Serve, conf.DNS.Serve6}, upstreamDNS, conf.DNS.Fallback, conf.Router.Country.MMDB, proxyDial)
 	r.BlockRule = suffixtree.NewNodeFromRules(conf.Router.Block.Rules...)
 	r.DirectRule = suffixtree.NewNodeFromRules(conf.Router.Direct.Rules...)
 	r.ProxyRule = suffixtree.NewNodeFromRules(conf.Router.Proxy.Rules...)
 	r.AddCountryCIDRs(conf.Router.Country.Rules...)

+	errCh := make(chan error, 8)
+	go watchServeErrors(ctx, stop, errCh)
+
 	if conf.DNS.Disable {
-		log.Info().Msg("DNS proxy disabled")
+		slog.Info("DNS proxy disabled")
 	} else {
 		ips := make([]string, 0, 2)
 		if strings.TrimSpace(conf.DNS.Serve) != "" {
@@ -145,63 +125,64 @@ func main() {
 		}

 		for _, ip := range ips {
-			lnHTTP, err := net.Listen("tcp", net.JoinHostPort(ip, "80"))
-			log.DebugFatal(err).Str("listen_on", net.JoinHostPort(ip, "80")).Msg("listen port 80")
-			go ServeHTTP(lnHTTP, r)
+			if err := startTCPService(ctx, errCh, "http proxy", net.JoinHostPort(ip, "80"), func(ctx context.Context, ln net.Listener) error {
+				return ServeHTTP(ctx, ln, r)
+			}); err != nil {
+				slog.Error("start http proxy", "error", err, "listen_on", net.JoinHostPort(ip, "80"))
+				os.Exit(1)
+			}

-			lnHTTPS, err := net.Listen("tcp", net.JoinHostPort(ip, "443"))
-			log.DebugFatal(err).Str("listen_on", net.JoinHostPort(ip, "443")).Msg("listen port 443")
-			go ServeHTTPS(lnHTTPS, r)
+			if err := startTCPService(ctx, errCh, "https proxy", net.JoinHostPort(ip, "443"), func(ctx context.Context, ln net.Listener) error {
+				return ServeHTTPS(ctx, ln, r)
+			}); err != nil {
+				slog.Error("start https proxy", "error", err, "listen_on", net.JoinHostPort(ip, "443"))
+				os.Exit(1)
+			}

-			go func(ip string) {
-				err := dns.ListenAndServe(net.JoinHostPort(ip, "53"), "udp", r)
-				log.InfoFatal(err).Str("listen_on", ip).Msg("serve dns")
-			}(ip)
+			if err := startDNSService(ctx, errCh, net.JoinHostPort(ip, "53"), r); err != nil {
+				slog.Error("start dns proxy", "error", err, "listen_on", net.JoinHostPort(ip, "53"))
+				os.Exit(1)
+			}
 		}
 	}

-	go func() {
-		if conf.Socks5.Disable {
-			log.Info().Msg("SOCKS5 proxy disabled")
-			return
-		}
-
-		ln, err := net.Listen("tcp", conf.Socks5.Addr)
-		if err != nil {
-			log.Fatal().Err(err).Msg("listen port")
-		}
-		log.Info().Msgf("SOCKS5 proxy listening on %s", conf.Socks5.Addr)
-		go ServeSocks5(ln, r)
-	}()
+	if conf.Socks5.Disable {
+		slog.Info("SOCKS5 proxy disabled")
+	} else if err := startTCPService(ctx, errCh, "socks5 proxy", conf.Socks5.Addr, func(ctx context.Context, ln net.Listener) error {
+		return ServeSocks5(ctx, ln, r)
+	}); err != nil {
+		slog.Error("start socks5 proxy", "error", err, "listen_on", conf.Socks5.Addr)
+		os.Exit(1)
+	}

 	start := time.Now()
-	loadRule(r.BlockRule, proxyDial, conf.Router.Block.File, conf.Router.Block.FilePrefix)
-	loadRule(r.DirectRule, proxyDial, conf.Router.Direct.File, conf.Router.Direct.FilePrefix)
-	loadRule(r.ProxyRule, proxyDial, conf.Router.Proxy.File, conf.Router.Proxy.FilePrefix)
-	for line := range fetchRuleFile(proxyDial, conf.Router.Country.File) {
+	loadRule(ctx, r.BlockRule, proxyDial, conf.Router.Block.File, conf.Router.Block.FilePrefix)
+	loadRule(ctx, r.DirectRule, proxyDial, conf.Router.Direct.File, conf.Router.Direct.FilePrefix)
+	loadRule(ctx, r.ProxyRule, proxyDial, conf.Router.Proxy.File, conf.Router.Proxy.FilePrefix)
+	for line := range fetchRuleFile(ctx, proxyDial, conf.Router.Country.File) {
 		r.AddCountryCIDRs(line)
 	}

-	log.Info().
-		Dur("took", time.Since(start)).
-		Uint64("blockRule", r.BlockRule.Count).
-		Uint64("directRule", r.DirectRule.Count).
-		Uint64("proxyRule", r.ProxyRule.Count).
-		Msg("Loaded rules, proxy started")
+	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 {}
+
+	<-ctx.Done()
+	slog.Info("shutting down sower", "reason", ctx.Err())
 }

-func loadRule(rule *suffixtree.Node, proxyDial router.ProxyDialFn, file, linePrefix string) {
-	for line := range fetchRuleFile(proxyDial, file) {
+func loadRule(ctx context.Context, rule *suffixtree.Node, proxyDial router.ProxyDialFn, file, linePrefix string) {
+	for line := range fetchRuleFile(ctx, proxyDial, file) {
 		rule.Add(linePrefix + line)
 	}
 	rule.GC()
 }

-func fetchRuleFile(proxyDial router.ProxyDialFn, file string) <-chan string {
+func fetchRuleFile(ctx context.Context, proxyDial router.ProxyDialFn, file string) <-chan string {
 	if file == "" {
-		return make(chan string)
+		ch := make(chan string)
+		close(ch)
+		return ch
 	}

 	var loadFn func() (io.ReadCloser, error)
@@ -213,8 +194,9 @@ func fetchRuleFile(proxyDial router.ProxyDialFn, file string) <-chan string {
 	} else {
 		// load rule file from remote by HTTP
 		client := &http.Client{
+			Timeout: 15 * time.Second,
 			Transport: &http.Transport{
-				Dial: func(network, addr string) (net.Conn, error) {
+				DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
 					domain, port, _ := net.SplitHostPort(addr)
 					p, _ := strconv.Atoi(port)
 					return proxyDial("tcp", domain, uint16(p))
@@ -223,7 +205,10 @@ func fetchRuleFile(proxyDial router.ProxyDialFn, file string) <-chan string {
 		}

 		loadFn = func() (io.ReadCloser, error) {
-			req, _ := http.NewRequest(http.MethodGet, file, nil)
+			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 {
@@ -245,14 +230,26 @@ func fetchRuleFile(proxyDial router.ProxyDialFn, file string) <-chan string {
 		if err == nil {
 			break
 		}
+		if ctx.Err() != nil {
+			slog.Error("fetch rule file", "error", ctx.Err(), "file", file)
+			os.Exit(1)
+		}

 		// wait: 28.5s
-		time.Sleep(i * i * 100 * time.Millisecond)
+		timer := time.NewTimer(i * i * 100 * time.Millisecond)
+		select {
+		case <-ctx.Done():
+			timer.Stop()
+			slog.Error("fetch rule file", "error", ctx.Err(), "file", file)
+			os.Exit(1)
+		case <-timer.C:
+		}
 		rc, err = loadFn()
 	}
-	log.InfoFatal(err).
-		Str("file", file).
-		Msg("fetch rule file")
+	if err != nil {
+		slog.Error("fetch rule file", "error", err, "file", file)
+		os.Exit(1)
+	}

 	ch := make(chan string, 100)
 	go func() {
@@ -269,9 +266,7 @@ func fetchRuleFile(proxyDial router.ProxyDialFn, file string) <-chan string {
 			if err == io.EOF {
 				return
 			} else if err != nil {
-				log.Error().Err(err).
-					Str("file", file).
-					Msg("read line")
+				slog.Error("read line", "error", err, "file", file)
 				return
 			}

@@ -285,3 +280,72 @@ func fetchRuleFile(proxyDial router.ProxyDialFn, file string) <-chan string {

 	return ch
 }
+
+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 || stderrors.Is(err, net.ErrClosed) {
+		return
+	}
+
+	select {
+	case errCh <- fmt.Errorf("%s: %w", service, err):
+	default:
+	}
+}
+
+func startTCPService(ctx context.Context, errCh chan<- error, service, addr string, serve func(context.Context, net.Listener) error) error {
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		return fmt.Errorf("listen on %s: %w", addr, err)
+	}
+
+	slog.Info("service listening", "service", service, "network", "tcp", "addr", addr)
+	go closeOnDone(ctx, ln)
+	go func() {
+		reportServeError(errCh, service, serve(ctx, ln))
+	}()
+	return nil
+}
+
+func startDNSService(ctx context.Context, errCh chan<- error, addr string, handler dns.Handler) error {
+	pc, err := net.ListenPacket("udp", addr)
+	if err != nil {
+		return fmt.Errorf("listen on %s: %w", addr, err)
+	}
+
+	server := &dns.Server{
+		PacketConn: pc,
+		Handler:    handler,
+	}
+	slog.Info("service listening", "service", "dns proxy", "network", "udp", "addr", addr)
+	go shutdownDNSServerOnDone(ctx, server)
+	go func() {
+		err := server.ActivateAndServe()
+		if err != nil && !stderrors.Is(err, net.ErrClosed) {
+			reportServeError(errCh, "dns proxy", fmt.Errorf("serve on %s: %w", addr, err))
+		}
+	}()
+	return nil
+}
+
+func watchServeErrors(ctx context.Context, stop context.CancelFunc, errCh <-chan error) {
+	select {
+	case <-ctx.Done():
+		return
+	case err := <-errCh:
+		if err == nil {
+			return
+		}
+		slog.Error("serve failed", "error", err)
+		stop()
+	}
+}
@@ -0,0 +1,47 @@
+package main
+
+import (
+	"compress/gzip"
+	"context"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"slices"
+	"strconv"
+	"testing"
+)
+
+func TestFetchRuleFileEmptyPathReturnsClosedChannel(t *testing.T) {
+	t.Parallel()
+
+	ch := fetchRuleFile(context.Background(), nil, "")
+	if _, ok := <-ch; ok {
+		t.Fatal("expected closed channel for empty rule file path")
+	}
+}
+
+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 := make([]string, 0, 2)
+	for line := range fetchRuleFile(context.Background(), dialFn, srv.URL) {
+		got = append(got, line)
+	}
+
+	want := []string{"alpha", "beta"}
+	if !slices.Equal(got, want) {
+		t.Fatalf("unexpected rules: got %v want %v", got, want)
+	}
+}
@@ -2,56 +2,82 @@ package main

 import (
 	"bufio"
-	"crypto/tls"
+	"context"
+	stderrors "errors"
+	"fmt"
+	"io"
+	"log/slog"
 	"net"
 	"net/http"
+	"strings"
 	"time"

-	"github.com/pkg/errors"
+	utls "github.com/refraction-networking/utls"
 	"github.com/sower-proxy/conns/relay"
-	"github.com/sower-proxy/conns/teeconn"
-	"github.com/sower-proxy/deferlog/log"
-	"github.com/wweir/sower/router"
-	"github.com/wweir/sower/transport"
-	"github.com/wweir/sower/transport/socks5"
-	"github.com/wweir/sower/transport/sower"
-	"github.com/wweir/sower/transport/trojan"
+	"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"
 )

-func GenProxyDial(proxyType, proxyHost, proxyPassword string) router.ProxyDialFn {
+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)

-	switch conf.Remote.Type {
-	case "sower":
-		proxy = sower.New(conf.Remote.Password)
-		tlsCfg := &tls.Config{}
-		dialFn = func() (net.Conn, error) {
-			return tls.Dial("tcp", net.JoinHostPort(proxyHost, "443"), tlsCfg)
-		}
+	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
+			},
+		},
+	}

-	case "trojan":
-		proxy = trojan.New(conf.Remote.Password)
-		tlsCfg := &tls.Config{}
-		dialFn = func() (net.Conn, error) {
-			return tls.Dial("tcp", net.JoinHostPort(proxyHost, "443"), tlsCfg)
+	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 net.Dial("tcp", proxyHost)
+			return dialer.Dial("tcp", proxyHost)
 		}
-
 	default:
-		log.Fatal().
-			Str("type", conf.Remote.Type).
-			Msg("unknown proxy type")
+		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, errors.Errorf("invalid addr(%s:%d)", host, port)
+			return nil, fmt.Errorf("invalid addr(%s:%d)", host, port)
 		}

 		conn, err := dialFn()
@@ -65,155 +91,304 @@ func GenProxyDial(proxyType, proxyHost, proxyPassword string) router.ProxyDialFn
 		}

 		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 ServeHTTP(ln net.Listener, r *router.Router) {
-	conn, err := ln.Accept()
-	if err != nil {
-		log.Fatal().Err(err).
-			Msg("serve socks5")
+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)
 	}
+}

-	go ServeHTTP(ln, 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()
-	teeconn := teeconn.New(conn)
-	defer teeconn.Close()
+	rereadConn := reread.New(conn)
+	defer rereadConn.Close()

-	req, err := http.ReadRequest(bufio.NewReader(teeconn))
+	_ = rereadConn.SetDeadline(time.Now().Add(proxyReadTimeout))
+	req, err := http.ReadRequest(bufio.NewReader(rereadConn))
 	if err != nil {
-		log.Error().Err(err).Msg("read http request")
+		slog.Error("read http request", "error", err)
 		return
 	}
+	_ = rereadConn.SetDeadline(time.Time{})

 	rc, err := r.ProxyDial("tcp", req.Host, 80)
 	if err != nil {
-		log.Error().Err(err).
-			Str("host", req.Host).
-			Interface("req", req.URL).
-			Msg("dial proxy")
+		slog.Error("dial proxy", "error", err, "host", req.Host, "req", req.URL)
 		return
 	}
 	defer rc.Close()

-	teeconn.Stop().Reread()
-	err = relay.Relay(teeconn, rc)
-	log.DebugWarn(err).
-		Str("host", req.Host).
-		Dur("spend", time.Since(start)).
-		Msg("serve http")
+	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 ServeHTTPS(ln net.Listener, r *router.Router) {
-	conn, err := ln.Accept()
-	if err != nil {
-		log.Fatal().Err(err).
-			Msg("serve socks5")
-	}
-
-	go ServeHTTPS(ln, r)
+func handleHTTPSConn(conn net.Conn, r *router.Router) {
 	start := time.Now()
-	teeconn := teeconn.New(conn)
-	defer teeconn.Close()
+	rereadConn := reread.New(conn)
+	defer rereadConn.Close()

-	var domain string
-	tls.Server(teeconn, &tls.Config{
-		GetConfigForClient: func(hello *tls.ClientHelloInfo) (*tls.Config, error) {
-			domain = hello.ServerName
-			return nil, nil
-		},
-	}).Handshake()
+	_ = 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 {
-		log.Error().Err(err).
-			Str("host", domain).
-			Msg("dial proxy")
+		slog.Error("dial proxy", "error", err, "host", domain)
 		return
 	}
 	defer rc.Close()

-	teeconn.Stop().Reread()
-	err = relay.Relay(teeconn, rc)
-	log.DebugWarn(err).
-		Str("host", domain).
-		Dur("spend", time.Since(start)).
-		Msg("serve http")
+	rereadConn.Stop().Reread()
+	err = relay.Relay(rereadConn, rc)
+	if err != nil {
+		slog.Debug("serve https", "error", err, "host", domain, "spend", time.Since(start))
+	}
 }

-func ServeSocks5(ln net.Listener, r *router.Router) {
-	conn, err := ln.Accept()
+func peekTLSClientHelloServerName(conn io.Reader) (string, error) {
+	clientHello, err := readTLSClientHello(conn)
 	if err != nil {
-		log.Fatal().Err(err).
-			Msg("serve socks5")
+		return "", err
 	}
-	go ServeSocks5(ln, r)
+
+	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()

-	teeConn := teeconn.New(conn)
+	rereadConn := reread.New(conn)
+	_ = rereadConn.SetDeadline(time.Now().Add(proxyReadTimeout))

-	buf1 := make([]byte, 1)
-	if _, err := teeConn.Read(buf1); err != nil {
-		log.Warn().Err(err).
-			Msg("read socks5 version")
+	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 buf1[0] != 5 {
-		teeConn.Reread()
-		serveHttpProxy(teeConn, r)
-		return
-	}
-
-	teeConn.Stop().Reread()
-	addr, err := socks5.New().Unwrap(teeConn)
-	if err != nil {
-		log.Warn().Err(err).
-			Msgf("parse socks5 target: %s", addr)
-		return
-	}
-
-	host, port := addr.(*socks5.AddrHead).Addr()
-	r.RouteHandle(teeConn, host, port)
-}
-
-func serveHttpProxy(teeConn *teeconn.Conn, r *router.Router) {
-	req, err := http.ReadRequest(bufio.NewReader(teeConn))
-	if err != nil {
-		log.Warn().Err(err).
-			Msg("read http request")
-		return
-	}
-
-	teeConn.Stop()
-	switch req.Method {
-	case "CONNECT":
-		if _, err := teeConn.Write([]byte(req.Proto + " 200 Connection established\r\n\r\n")); err != nil {
-			log.Warn().Err(err).
-				Msg("write https proxy response")
+	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, err := router.ParseHostPort(req.Host, 443)
+		host, port := addr.(*socks5.AddrHead).Addr()
+		rc, err := r.Dial("tcp", host, port)
 		if err != nil {
-			log.Warn().Err(err).
-				Msg("parse https_proxy target")
-			return
-		}
-
-		rc, err := r.ProxyDial("tcp", host, port)
-		if err != nil {
-			log.Warn().Err(err).
-				Str("host", host).
-				Msg("dial proxy")
+			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()

-		relay.Relay(teeConn, rc)
+		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
+	}

-	default:
-		teeConn.Reread()
-		r.RouteHandle(teeConn, req.Host, 80)
+	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
+}
@@ -0,0 +1,261 @@
+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 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
+		},
+	}
+}
@@ -1,60 +1,204 @@
 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/teeconn"
-	"github.com/sower-proxy/deferlog"
-	"github.com/sower-proxy/deferlog/log"
-	"github.com/wweir/sower/transport/sower"
-	"github.com/wweir/sower/transport/trojan"
+	"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
-
-	conf = struct {
-		ServeIP  string `usage:"listen to port 80 443 of this IP, eg: 0.0.0.0"`
-		Password string `required:"true"`
-		FakeSite string `default:"127.0.0.1:8080" usage:"fake site address or directoy"`
-
-		Cert struct {
-			Email string
-			Cert  string
-			Key   string
-		}
-	}{}
 )

 func init() {
-	err := aconfig.LoaderFor(&conf, aconfig.Config{}).Load()
-	log.InfoFatal(err).
-		Str("version", version).
-		Str("date", date).
-		Interface("config", conf).
-		Msg("Load config")
+	setLogger(slog.LevelInfo)
 }

 func main() {
-	cacheDir, _ := os.UserCacheDir()
-	cacheDir = filepath.Join(cacheDir, "sower")
-	if err := os.MkdirAll(cacheDir, 0600); err != nil {
-		log.Fatal().Err(err).
-			Str("dir", cacheDir).
-			Msg("make cache dir")
+	if hasInstallFlag(os.Args[1:]) {
+		if err := install.InstallService(stdinConfirm); err != nil {
+			slog.Error("install service", "error", err)
+			os.Exit(1)
+		}
+		return
 	}

-	certManager := autocert.Manager{
+	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:  conf.Cert.Email,
+		Email:  cfg.Cert.Email,
 		Cache:  autocert.DirCache(cacheDir),
 	}

@@ -63,86 +207,159 @@ func main() {
 		MinVersion:     tls.VersionTLS12,
 		NextProtos:     []string{"http/1.1", "h2"},
 	}
-	if conf.Cert.Cert != "" || conf.Cert.Key != "" {
-		cert, err := tls.LoadX509KeyPair(conf.Cert.Cert, conf.Cert.Key)
-		if err != nil {
-			log.Fatal().Err(err).Msg("load certificate")
+
+	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
 		}

-		tlsConf.GetCertificate = nil
-		tlsConf.Certificates = []tls.Certificate{cert}
-	}
-
-	// Redirect 80 to 443
-	go func() {
-		err := http.ListenAndServe(net.JoinHostPort(conf.ServeIP, "80"),
-			certManager.HTTPHandler(http.HandlerFunc(redirectToHTTPS)))
-		log.Fatal().Err(err).
-			Str("IP", conf.ServeIP).
-			Msg("Listen HTTP service")
-	}()
-
-	ln, err := tls.Listen("tcp", net.JoinHostPort(conf.ServeIP, "443"), tlsConf)
-	log.InfoFatal(err).
-		Str("IP", conf.ServeIP).
-		Msg("Start listen HTTPS service")
-
-	if si, err := os.Stat(conf.FakeSite); err == nil && si.IsDir() {
-		http.NewFileTransport(http.Dir(conf.FakeSite))
-	} else if _, _, err := net.SplitHostPort(conf.FakeSite); err == nil {
-		go serve443(ln, conf.FakeSite, sower.New(conf.Password), trojan.New(conf.Password))
-	}
-
-	select {}
+		target := "https://" + r.Host + r.URL.RequestURI()
+		http.Redirect(w, r, target, http.StatusPermanentRedirect)
+	})
 }

-func redirectToHTTPS(w http.ResponseWriter, r *http.Request) {
-	r.URL.Scheme = "https"
-	if host, _, err := net.SplitHostPort(r.Host); err != nil {
-		r.URL.Host = r.Host
-	} else {
-		r.URL.Host = host
-	}
+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
+			}

-	http.Redirect(w, r, r.URL.String(), 301)
+			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 serve443(ln net.Listener, fakeSite string, sower *sower.Sower, trojan *trojan.Trojan) {
-	conn, err := ln.Accept()
-	if err != nil {
-		log.Fatal().Err(err).Msg("serve 443 port")
-	}
-	go serve443(ln, fakeSite, sower, trojan)
-	teeconn := teeconn.New(conn)
-	defer teeconn.Close()
+func handleConn(conn net.Conn, fakeSite string, sower *transportSower.Sower, trojan *trojan.Trojan) {
+	rereadConn := reread.New(conn)
+	defer rereadConn.Close()

-	var addr net.Addr
-	var dur time.Duration
+	_ = rereadConn.SetReadDeadline(time.Now().Add(probeTimeout))
+
+	var (
+		addr net.Addr
+		dur  time.Duration
+		err  error
+	)
 	defer func() {
-		deferlog.DebugWarn(err).
-			Dur("spend", dur).
-			Msgf("relay conn to %s", addr)
+		deferlog.DebugWarn(err, "relay conn", "took", dur, "addr", addr)
 	}()

-	// 1. detect if it's a sower underlaying connection
-	teeconn.Reread()
-	if addr, err = sower.Unwrap(teeconn); err == nil {
-		teeconn.Stop()
-
-		dur, err = relay.RelayTo(teeconn, addr.String())
+	rereadConn.Reread()
+	if addr, err = sower.Unwrap(rereadConn); err == nil {
+		rereadConn.Stop()
+		_ = rereadConn.SetReadDeadline(time.Time{})
+		dur, err = relay.RelayTo(rereadConn, addr.String())
 		return
 	}

-	// 2. detect if it's a trojan underlaying connection
-	teeconn.Reread()
-	if addr, err = trojan.Unwrap(teeconn); err == nil {
-		teeconn.Stop()
-
-		dur, err = relay.RelayTo(teeconn, addr.String())
+	rereadConn.Reread()
+	if addr, err = trojan.Unwrap(rereadConn); err == nil {
+		rereadConn.Stop()
+		_ = rereadConn.SetReadDeadline(time.Time{})
+		dur, err = relay.RelayTo(rereadConn, addr.String())
 		return
 	}

-	// 3. fallback to fake site
-	teeconn.Stop().Reread()
-	dur, err = relay.RelayTo(teeconn, fakeSite)
+	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
 }
@@ -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)
+			}
+		})
+	}
+}
@@ -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)
+}
@@ -0,0 +1,195 @@
+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'"`
+			Rules      []string `usage:"block list rules"`
+		}
+		Direct struct {
+			File       string   `usage:"direct list file, local file or remote"`
+			FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
+			Rules      []string `usage:"direct list rules"`
+		}
+		Proxy struct {
+			File       string   `usage:"proxy list file, local file or remote"`
+			FilePrefix string   `default:"**." usage:"parsed as '<prefix>line_text'"`
+			Rules      []string `usage:"proxy list rules"`
+		}
+
+		Country struct {
+			MMDB       string   `usage:"mmdb file"`
+			File       string   `usage:"CIDR block list file, local file or remote"`
+			FilePrefix string   `default:"" usage:"parsed as '<prefix>line_text'"`
+			Rules      []string `usage:"CIDR list rules"`
+		}
+	}
+}
+
+// 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
+}
@@ -0,0 +1,58 @@
+# 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
+rules = []         # Additional block rules
+
+# Direct list rules
+[router.direct]
+file = ""          # Direct list file path (local or remote)
+file_prefix = "**." # Prefix for direct list rules
+rules = []         # Additional direct rules
+
+# Proxy list rules
+[router.proxy]
+file = ""          # Proxy list file path (local or remote)
+file_prefix = "**." # Prefix for proxy list rules
+rules = []         # Additional proxy rules
+
+# Country-based routing
+[router.country]
+mmdb = ""       # MMDB file path for GeoIP
+file = ""       # CIDR block list file path
+file_prefix = "" # Prefix for CIDR rules
+rules = []      # Additional CIDR rules
@@ -0,0 +1,56 @@
+# 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
+    rules: [] # Additional block rules
+
+  # Direct list rules
+  direct:
+    file: "" # Direct list file path (local or remote)
+    file_prefix: "**." # Prefix for direct list rules
+    rules: [] # Additional direct rules
+
+  # Proxy list rules
+  proxy:
+    file: "" # Proxy list file path (local or remote)
+    file_prefix: "**." # Prefix for proxy list rules
+    rules: [] # Additional proxy rules
+
+  # Country-based routing
+  country:
+    mmdb: "" # MMDB file path for GeoIP
+    file: "" # CIDR block list file path
+    file_prefix: "" # Prefix for CIDR rules
+    rules: [] # Additional CIDR rules
@@ -0,0 +1,79 @@
+package config
+
+import "testing"
+
+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")
+	}
+}
@@ -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
+}
@@ -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)
@@ -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)
@@ -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)
+			}
+		})
+	}
+}
@@ -1,37 +1,37 @@
-module github.com/wweir/sower
+module github.com/sower-proxy/sower

-go 1.22
-
-toolchain go1.22.3
+go 1.26.1

 require (
-	github.com/cristalhq/aconfig v0.18.5
+	github.com/cristalhq/aconfig v0.19.0
 	github.com/cristalhq/aconfig/aconfighcl v0.17.1
 	github.com/cristalhq/aconfig/aconfigtoml v0.17.1
 	github.com/cristalhq/aconfig/aconfigyaml v0.17.1
 	github.com/krolaw/dhcp4 v0.0.0-20190909130307-a50d88189771
 	github.com/libp2p/go-reuseport v0.4.0
-	github.com/miekg/dns v1.1.59
-	github.com/oschwald/geoip2-golang v1.9.0
+	github.com/lmittmann/tint v1.1.3
+	github.com/miekg/dns v1.1.72
+	github.com/oschwald/geoip2-golang v1.13.0
 	github.com/pkg/errors v0.9.1
-	github.com/sower-proxy/conns v0.0.3
-	github.com/sower-proxy/deferlog v1.0.7
+	github.com/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 v0.23.0
+	golang.org/x/crypto v0.49.0
 )

 require (
-	github.com/BurntSushi/toml v1.3.2 // indirect
+	github.com/BurntSushi/toml v1.1.0 // indirect
+	github.com/andybalholm/brotli v1.0.6 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/oschwald/maxminddb-golang v1.12.0 // indirect
-	github.com/rs/zerolog v1.32.0 // indirect
-	golang.org/x/mod v0.17.0 // indirect
-	golang.org/x/net v0.25.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/sys v0.20.0 // indirect
-	golang.org/x/text v0.15.0 // indirect
-	golang.org/x/tools v0.21.0 // indirect
+	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
 )
@@ -1,10 +1,10 @@
+github.com/BurntSushi/toml v1.1.0 h1:ksErzDEI1khOiGPgpwuI7x2ebx/uXQNw7xJpn9Eq1+I=
 github.com/BurntSushi/toml v1.1.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
-github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
-github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
-github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+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 v0.18.5 h1:QqXH/Gy2c4QUQJTV2BN8UAuL/rqZ3IwhvxeC8OgzquA=
-github.com/cristalhq/aconfig v0.18.5/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=
 github.com/cristalhq/aconfig/aconfighcl v0.17.1 h1:/hJvmmoP3akvjY8qARiXgN30m/WXeBvpQdQ8v4DE8W8=
 github.com/cristalhq/aconfig/aconfighcl v0.17.1/go.mod h1:oOPqMmdUjVW6pKKO1zkOwQKHSUD0rlu8F5do+pylOQc=
 github.com/cristalhq/aconfig/aconfigtoml v0.17.1 h1:TA3xH8mALD8YeULsr4v87cMbKGBma35lWeRga4Xn11Q=
@@ -13,57 +13,54 @@ github.com/cristalhq/aconfig/aconfigyaml v0.17.1 h1:xCCbRKVmKrft9gQj3gHOq6U5Pdua
 github.com/cristalhq/aconfig/aconfigyaml v0.17.1/go.mod h1:5DTsjHkvQ6hfbyxfG32roB1lF0U82rROtFaLxibL8V8=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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@@ -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
+}
@@ -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)
+	}
+}
@@ -1,7 +1,7 @@
 package dhcp

 import (
-	"math/rand"
+	"crypto/rand"
 	"net"
 	"runtime"
 	"time"
@@ -11,7 +11,6 @@ import (
 	"github.com/pkg/errors"
 )

-var xid = make([]byte, 4)
 var broadcastAddr, _ = net.ResolveUDPAddr("udp", "255.255.255.255:67")

 func GetDNSServer() ([]string, error) {
@@ -20,7 +19,10 @@ func GetDNSServer() ([]string, error) {
 		return nil, errors.Wrap(err, "pick interface")
 	}

-	rand.Read(xid)
+	xid := make([]byte, 4)
+	if _, err := rand.Read(xid); err != nil {
+		return nil, errors.Wrap(err, "generate xid")
+	}
 	pack := dhcp4.RequestPacket(dhcp4.Discover, iface.HardwareAddr, net.IPv4(0, 0, 0, 0), xid, true, []dhcp4.Option{
 		{Code: dhcp4.OptionRequestedIPAddress, Value: []byte(iface.IP.To4())},
 		{Code: dhcp4.End},
@@ -3,7 +3,7 @@ package dhcp_test
 import (
 	"fmt"

-	"github.com/wweir/sower/pkg/dhcp"
+	"github.com/sower-proxy/sower/pkg/dhcp"
 )

 func Example_dns() {
@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows

 package dhcp
@@ -15,13 +16,23 @@ func PickInternetInterface() (*Iface, error) {
 	}

 	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, _ := ifaces[i].Addrs()
+		addrs, err := ifaces[i].Addrs()
+		if err != nil {
+			continue
+		}
 		for _, addr := range addrs {
-			if ip := addr.(*net.IPNet).IP.To4(); ip != nil {
+			ipNet, ok := addr.(*net.IPNet)
+			if !ok {
+				continue
+			}
+			if ip := ipNet.IP.To4(); ip != nil && ip.IsGlobalUnicast() {
 				return &Iface{ifaces[i].HardwareAddr, ip}, nil
 			}
 		}
@@ -3,7 +3,7 @@ package dhcp_test
 import (
 	"fmt"

-	"github.com/wweir/sower/pkg/dhcp"
+	"github.com/sower-proxy/sower/pkg/dhcp"
 )

 func Example_iface() {
@@ -12,6 +12,7 @@ type Node struct {
 type node struct {
 	secs     []string
 	subNodes []*node
+	indexMap map[string]int
 }

 func NewNodeFromRules(rules ...string) *Node {
@@ -50,7 +51,7 @@ func (n *node) string(prefix, indent string) (out string) {
 }

 func (n *Node) trim(item string) string {
-	return strings.TrimSuffix(item, n.sep)
+	return strings.ToLower(strings.TrimSuffix(item, n.sep))
 }

 func (n *Node) Add(item string) {
@@ -63,13 +64,18 @@ func (n *node) add(secs []string) {
 	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.secs = append([]string{sec}, n.secs...)
-			n.subNodes = append([]*node{nil}, n.subNodes...)
+			n.prepend(sec, nil)
 		default:
-			n.secs = append(n.secs, sec)
-			n.subNodes = append(n.subNodes, nil)
+			n.append(sec, nil)
 		}
 	default:
 		sec := secs[length-1]
@@ -81,13 +87,9 @@ func (n *node) add(secs []string) {
 		if idx == -1 {
 			switch sec {
 			case "", "*", "**":
-				idx = 0
-				n.secs = append([]string{sec}, n.secs...)
-				n.subNodes = append([]*node{{}}, n.subNodes...)
+				idx = n.prepend(sec, &node{})
 			default:
-				idx = len(n.secs)
-				n.secs = append(n.secs, sec)
-				n.subNodes = append(n.subNodes, &node{})
+				idx = n.append(sec, &node{})
 			}

 		} else if n.subNodes[idx] == nil {
@@ -104,10 +106,10 @@ func (n *Node) Match(item string) bool {
 		return false
 	}

-	return n.matchSecs(strings.Split(n.trim(item), n.sep), false)
+	return n.matchSecs(strings.Split(n.trim(item), n.sep))
 }

-func (n *node) matchSecs(secs []string, fuzzNode bool) bool {
+func (n *node) matchSecs(secs []string) bool {
 	length := len(secs)
 	if length == 0 {
 		if n == nil {
@@ -117,12 +119,12 @@ func (n *node) matchSecs(secs []string, fuzzNode bool) bool {
 	}

 	if idx := n.index(secs[length-1]); idx >= 0 {
-		if n.subNodes[idx].matchSecs(secs[:length-1], false) {
+		if n.subNodes[idx].matchSecs(secs[:length-1]) {
 			return true
 		}
 	}
 	if idx := n.index("*"); idx >= 0 {
-		if n.subNodes[idx].matchSecs(secs[:length-1], true) {
+		if n.subNodes[idx].matchSecs(secs[:length-1]) {
 			return true
 		}
 	}
@@ -134,10 +136,49 @@ func (n *node) index(sec string) int {
 	if n == nil {
 		return -1
 	}
-	for s := range n.secs {
-		if n.secs[s] == sec {
-			return s
+
+	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
+	}
+}
@@ -3,7 +3,7 @@ package suffixtree_test
 import (
 	"testing"

-	"github.com/wweir/sower/pkg/suffixtree"
+	"github.com/sower-proxy/sower/pkg/suffixtree"
 )

 func TestNode_Match(t *testing.T) {
@@ -74,6 +74,42 @@ func TestNode_Match(t *testing.T) {
 		[]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) {
@@ -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
+}
@@ -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")
+	}
+}
@@ -2,10 +2,9 @@ package router

 import (
 	"context"
+	"log/slog"
 	"net"
 	"time"
-
-	"github.com/sower-proxy/deferlog/log"
 )

 func (r *Router) localSite(domain string) bool {
@@ -17,10 +16,7 @@ func (r *Router) localSite(domain string) bool {

 		ips, err := net.DefaultResolver.LookupIP(ctx, "ip", domain)
 		if err != nil || len(ips) == 0 {
-			log.Warn().Err(err).
-				Str("domain", domain).
-				Int("ips", len(ips)).
-				Msg("resolve domain")
+			slog.Warn("resolve domain", "error", err, "domain", domain, "ips", len(ips))
 			return false
 		}

@@ -38,10 +34,7 @@ func (r *Router) localSite(domain string) bool {
 	if r.country.Reader != nil {
 		city, err := r.country.City(ip)
 		if err != nil {
-			log.Warn().Err(err).
-				Str("domain", domain).
-				IPAddr("ip", ip).
-				Msg("mmdb search")
+			slog.Warn("mmdb search", "error", err, "domain", domain, "ip", ip)
 			return false
 		}

@@ -1,37 +1,51 @@
 package router

 import (
+	"errors"
+	"fmt"
+	"log/slog"
 	"net"
+	"strings"
+	"time"

 	"github.com/miekg/dns"
-	"github.com/sower-proxy/deferlog/log"
-	"github.com/wweir/sower/pkg/dhcp"
 )

+var errNoLocalIPForQuestionType = errors.New("no local IP for question type")
+
 func (r *Router) ServeDNS(w dns.ResponseWriter, req *dns.Msg) {
 	// https://stackoverflow.com/questions/4082081/requesting-a-and-aaaa-records-in-single-dns-query/4083071#4083071
-	if len(req.Question) == 0 {
+	if len(req.Question) != 1 {
 		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeFormatError))
 		return
 	}

 	domain := req.Question[0].Name
+	qtype := req.Question[0].Qtype
 	// 1. rule_based( block > direct > proxy )
-	switch {
-	case r.BlockRule.Match(domain):
+	if r.BlockRule.Match(domain) {
 		_ = w.WriteMsg(r.dnsFail(req, dns.RcodeNameError))
 		return
-
-	case r.DirectRule.Match(domain):
-
-	case r.ProxyRule.Match(domain):
-		host, _, err := net.SplitHostPort(w.LocalAddr().String())
-		log.DebugWarn(err).Str("host", host).Msg("proxy dns")
-		_ = w.WriteMsg(r.dnsProxyA(domain, net.ParseIP(host), req))
-		return
 	}

-	// 2. direct with cache, do not fallback to proxy to avoid side-effect
+	if !r.DirectRule.Match(domain) && r.ProxyRule.Match(domain) {
+		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
+		case isProxySensitiveQuestion(qtype):
+			_ = 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))
@@ -46,60 +60,369 @@ func (r *Router) dnsFail(req *dns.Msg, rcode int) *dns.Msg {
 	return m
 }

-func (r *Router) dnsProxyA(domain string, localIP net.IP, req *dns.Msg) *dns.Msg {
-	m := new(dns.Msg)
-	m.SetReply(req)
-
-	if localIP.To4() != nil {
-		m.Answer = []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 20},
-			A:   localIP,
-		}}
-
-	} else {
-		m.Answer = []dns.RR{&dns.AAAA{
-			Hdr:  dns.RR_Header{Name: domain, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 20},
-			AAAA: localIP,
-		}}
-	}
-	return m
+func (r *Router) dnsNoData(req *dns.Msg) *dns.Msg {
+	return dnsReply(req)
 }

-var upstreamAddrs []string
-var upstreamIndex = -1
-var queryCount = 0
+func (r *Router) dnsProxyReply(domain string, localAddr net.Addr, req *dns.Msg) (*dns.Msg, error) {
+	qtype := req.Question[0].Qtype
+	reply := dnsReply(req)

-func (r *Router) Exchange(req *dns.Msg) (_ *dns.Msg, err error) {
-	queryCount++
-	if upstreamIndex < 0 {
-		dnsIPs, err := dhcp.GetDNSServer()
-		log.Err(err).
-			Int("queryCount", queryCount).
-			Strs("dns", dnsIPs).
-			Msg("get dns server")
-
-		addrs := make([]string, 0, len(dnsIPs)+1)
-		for _, ip := range dnsIPs {
-			if ip != string(r.dns.serveIP) {
-				addrs = append(addrs, net.JoinHostPort(ip, "53"))
-			}
+	localIP, err := r.proxyReplyIP(localAddr, qtype)
+	if err != nil {
+		if errors.Is(err, errNoLocalIPForQuestionType) {
+			return reply, nil
 		}
-		if len(addrs) == 0 {
-			addrs = append(addrs, net.JoinHostPort(r.dns.fallbackDNS, "53"))
-		}
-
-		queryCount = 0
-		upstreamAddrs = addrs
-		upstreamIndex = len(addrs) - 1
+		return nil, err
 	}

-	resp, err := dns.Exchange(req, upstreamAddrs[upstreamIndex])
+	record, err := proxyReplyRecord(domain, qtype, localIP)
 	if err != nil {
-		upstreamIndex--
-		if upstreamIndex >= 0 {
-			resp, err = dns.Exchange(req, upstreamAddrs[upstreamIndex])
+		return nil, err
+	}
+	reply.Answer = []dns.RR{record}
+	return reply, nil
+}
+
+func (r *Router) proxyReplyIP(localAddr net.Addr, qtype uint16) (net.IP, error) {
+	host, _, err := net.SplitHostPort(localAddr.String())
+	if err != nil {
+		return nil, fmt.Errorf("split local dns address %q: %w", localAddr.String(), err)
+	}
+
+	ip := net.ParseIP(strings.Trim(host, "[]"))
+	if ip != nil && !ip.IsUnspecified() && matchesQuestionTypeIP(ip, qtype) {
+		return ip, nil
+	}
+	if ip == nil {
+		return nil, fmt.Errorf("parse local dns IP %q", host)
+	}
+	if !isAddressQuestion(qtype) {
+		return nil, fmt.Errorf("unsupported question type %d", qtype)
+	}
+
+	for _, serveIP := range r.dns.serveIPs {
+		if !serveIP.IsUnspecified() && matchesQuestionTypeIP(serveIP, qtype) {
+			return serveIP, nil
+		}
+	}
+
+	return nil, fmt.Errorf("%w %d", errNoLocalIPForQuestionType, qtype)
+}
+
+func isAddressQuestion(qtype uint16) bool {
+	return qtype == dns.TypeA || qtype == dns.TypeAAAA
+}
+
+func isProxySensitiveQuestion(qtype uint16) bool {
+	return qtype == dns.TypeHTTPS || qtype == dns.TypeSVCB
+}
+
+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])
 		}
 	}

 	return resp, err
 }
+
+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, nil
+	}
+
+	return r.exchangeTCP(req, addr)
+}
+
+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
+}
@@ -1,11 +1,11 @@
 package router

 import (
+	"fmt"
+	"log/slog"
 	"net/http"
-	"sync"
 	"time"

-	"github.com/sower-proxy/deferlog/log"
 	"github.com/sower-proxy/mem"
 )

@@ -19,7 +19,7 @@ func (r *Router) isAccess(domain string, port uint16) bool {
 		return false
 	}

-	ok, _ := accessCache.Get(domain)
+	ok, _ := accessCache.Get(accessCacheKey(domain, port))
 	return ok
 }

@@ -28,24 +28,31 @@ var pingClient = http.Client{
 }

 func httpPing(key string) (bool, error) {
-	wg := sync.WaitGroup{}
-	wg.Add(2)
-	var err80, err443 error
-	go func() {
-		_, err80 = pingClient.Head("http://" + key)
-		wg.Done()
-	}()
-	go func() {
-		_, err443 = pingClient.Head("https://" + key)
-		wg.Done()
-	}()
-	wg.Wait()
-
-	if err80 != nil && err443 != nil {
-		log.Warn().
-			Errs("errs", []error{err80, err443}).
-			Msg("Failed to ping")
+	scheme, host, err := accessProbeTarget(key)
+	if err != nil {
+		return false, err
 	}

-	return err80 == nil && err443 == nil, nil
+	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)
+	}
 }
@@ -1,49 +1,73 @@
 package router

 import (
+	"errors"
+	"fmt"
+	"log/slog"
 	"net"
 	"strconv"
+	"sync"
 	"time"

-	"github.com/miekg/dns"
 	geoip2 "github.com/oschwald/geoip2-golang"
-	"github.com/pkg/errors"
 	"github.com/sower-proxy/conns/relay"
-	"github.com/sower-proxy/deferlog"
-	"github.com/sower-proxy/deferlog/log"
-	"github.com/wweir/sower/pkg/suffixtree"
+	"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)
-type Router struct {
-	BlockRule  *suffixtree.Node
-	DirectRule *suffixtree.Node
-	ProxyRule  *suffixtree.Node
-	ProxyDial  ProxyDialFn
+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 {
-		dns.Client
-		fallbackDNS string
-		serveIP     net.IP
+		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
+		}
 	}
+)

-	country struct {
-		*geoip2.Reader
-		cidrs []*net.IPNet
-	}
-}
+var ErrBlocked = errors.New("route blocked")

-func NewRouter(serveIP, fallbackDNS, mmdbFile string, proxyDial ProxyDialFn) *Router {
+func NewRouter(serveIPs []string, upstreamDNS, fallbackDNS, mmdbFile string, proxyDial ProxyDialFn) *Router {
 	r := Router{
 		ProxyDial: proxyDial,
 	}

-	r.dns.serveIP = net.ParseIP(serveIP)
+	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)
+		}
+	}

 	var err error
 	r.country.Reader, err = geoip2.Open(mmdbFile)
-	log.InfoWarn(err).Str("file", mmdbFile).Msg("open geoip2 db")
+	if err != nil {
+		slog.Warn("open geoip2 db", "error", err, "file", mmdbFile)
+	}

 	return &r
 }
@@ -52,7 +76,8 @@ func (r *Router) AddCountryCIDRs(cidrs ...string) {
 	for _, cidr := range cidrs {
 		_, ipnet, err := net.ParseCIDR(cidr)
 		if err != nil {
-			log.Error().Err(err).Msg("Failed to parse CIDR")
+			slog.Error("failed to parse CIDR", "error", err, "cidr", cidr)
+			continue
 		}
 		r.country.cidrs = append(r.country.cidrs, ipnet)
 	}
@@ -62,13 +87,22 @@ func (r *Router) AddCountryCIDRs(cidrs ...string) {
 func (r *Router) RouteHandle(conn net.Conn, domain string, port uint16) (err error) {
 	start := time.Now()
 	defer func() {
-		deferlog.DebugWarn(err).
-			Str("domain", domain).
-			Uint16("port", port).
-			Dur("spend", time.Since(start)).
-			Msg("serve socks5")
+		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 )
@@ -76,34 +110,32 @@ func (r *Router) RouteHandle(conn net.Conn, domain string, port uint16) (err err
 	// 3. fallback( proxy )
 	switch {
 	case r.BlockRule.Match(domain):
-		return nil
-
+		return nil, ErrBlocked
 	case r.DirectRule.Match(domain):
-		return r.DirectHandle(conn, addr)
-
+		return r.directDial(network, addr)
 	case r.ProxyRule.Match(domain):
-		return r.ProxyHandle(conn, domain, port)
-
+		return r.proxyDial(network, domain, port)
 	case r.localSite(domain), r.isAccess(domain, port):
-		return r.DirectHandle(conn, addr)
+		return r.directDial(network, addr)
 	default:
-		return r.ProxyHandle(conn, domain, port)
+		return r.proxyDial(network, domain, port)
 	}
 }

-func (r *Router) ProxyHandle(conn net.Conn, domain string, port uint16) error {
+func (r *Router) proxyDial(network, domain string, port uint16) (net.Conn, error) {
 	start := time.Now()
-	rc, err := r.ProxyDial("tcp", domain, port)
+	rc, err := r.ProxyDial(network, domain, port)
 	if err != nil {
-		return errors.Wrapf(err, "proxy dial (%s:%d), spend (%s)", domain, port, time.Since(start))
+		return nil, fmt.Errorf("proxy dial %s:%d, spend (%s): %w", domain, port, time.Since(start), err)
 	}
-	defer rc.Close()
-
-	_ = relay.Relay(conn, rc)
-	return nil
+	return rc, nil
 }

-func (r *Router) DirectHandle(conn net.Conn, addr string) error {
-	dur, err := relay.RelayTo(conn, addr)
-	return errors.Wrapf(err, "spend (%s)", dur)
+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
 }
@@ -0,0 +1,783 @@
+package router
+
+import (
+	"errors"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/miekg/dns"
+	"github.com/sower-proxy/mem"
+	"github.com/sower-proxy/sower/pkg/suffixtree"
+)
+
+type roundTripFunc func(*http.Request) (*http.Response, error)
+
+func (fn roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return fn(req)
+}
+
+func TestDNSProxyReplyMatchesQuestionType(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1", "::1"}, "", "223.5.5.5", "", nil)
+
+	reqA := new(dns.Msg)
+	reqA.SetQuestion("example.com.", dns.TypeA)
+	respA, err := r.dnsProxyReply("example.com.", &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 53}, reqA)
+	if err != nil {
+		t.Fatalf("dnsProxyReply A failed: %v", err)
+	}
+	if len(respA.Answer) != 1 {
+		t.Fatalf("unexpected A answer count: %d", len(respA.Answer))
+	}
+	if _, ok := respA.Answer[0].(*dns.A); !ok {
+		t.Fatalf("expected A record, got %T", respA.Answer[0])
+	}
+
+	reqAAAA := new(dns.Msg)
+	reqAAAA.SetQuestion("example.com.", dns.TypeAAAA)
+	respAAAA, err := r.dnsProxyReply("example.com.", &net.UDPAddr{IP: net.ParseIP("::1"), Port: 53}, reqAAAA)
+	if err != nil {
+		t.Fatalf("dnsProxyReply AAAA failed: %v", err)
+	}
+	if len(respAAAA.Answer) != 1 {
+		t.Fatalf("unexpected AAAA answer count: %d", len(respAAAA.Answer))
+	}
+	if _, ok := respAAAA.Answer[0].(*dns.AAAA); !ok {
+		t.Fatalf("expected AAAA record, got %T", respAAAA.Answer[0])
+	}
+}
+
+func TestDNSProxyReplyPrefersRequestLocalAddr(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1", "127.0.0.2"}, "", "223.5.5.5", "", nil)
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeA)
+
+	resp, err := r.dnsProxyReply("example.com.", &net.UDPAddr{IP: net.ParseIP("127.0.0.2"), Port: 53}, req)
+	if err != nil {
+		t.Fatalf("dnsProxyReply failed: %v", err)
+	}
+
+	answer, ok := resp.Answer[0].(*dns.A)
+	if !ok {
+		t.Fatalf("expected A record, got %T", resp.Answer[0])
+	}
+	if !answer.A.Equal(net.ParseIP("127.0.0.2")) {
+		t.Fatalf("expected request local IP 127.0.0.2, got %s", answer.A)
+	}
+}
+
+func TestDNSProxyReplyIgnoresUnspecifiedLocalAddr(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.2", "0.0.0.0"}, "", "223.5.5.5", "", nil)
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeA)
+
+	resp, err := r.dnsProxyReply("example.com.", &net.UDPAddr{IP: net.ParseIP("0.0.0.0"), Port: 53}, req)
+	if err != nil {
+		t.Fatalf("dnsProxyReply failed: %v", err)
+	}
+
+	answer, ok := resp.Answer[0].(*dns.A)
+	if !ok {
+		t.Fatalf("expected A record, got %T", resp.Answer[0])
+	}
+	if !answer.A.Equal(net.ParseIP("127.0.0.2")) {
+		t.Fatalf("expected configured serve IP 127.0.0.2, got %s", answer.A)
+	}
+}
+
+func TestExchangeSkipsServeIPInUpstreamList(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "127.0.0.1", "127.0.0.2", "", nil)
+	addrs, err := r.buildUpstreamAddrs()
+	if err != nil {
+		t.Fatalf("buildUpstreamAddrs failed: %v", err)
+	}
+
+	if len(addrs) != 1 {
+		t.Fatalf("unexpected upstream list: %v", addrs)
+	}
+	if addrs[0] != "127.0.0.2:53" {
+		t.Fatalf("expected fallback only, got %v", addrs)
+	}
+}
+
+func TestBuildUpstreamAddrsPrefersConfiguredDNSBeforeFallback(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "1.1.1.1", "9.9.9.9", "", nil)
+	addrs, err := r.buildUpstreamAddrs()
+	if err != nil {
+		t.Fatalf("buildUpstreamAddrs failed: %v", err)
+	}
+
+	want := []string{"1.1.1.1:53", "9.9.9.9:53"}
+	if strings.Join(addrs, ",") != strings.Join(want, ",") {
+		t.Fatalf("unexpected upstream order: got %v want %v", addrs, want)
+	}
+}
+
+func TestAddCountryCIDRsSkipsInvalidEntries(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter(nil, "", "223.5.5.5", "", nil)
+	r.AddCountryCIDRs("invalid-cidr")
+
+	if len(r.country.cidrs) != 0 {
+		t.Fatalf("expected invalid CIDR to be skipped, got %d entries", len(r.country.cidrs))
+	}
+	if r.localSite("127.0.0.1") {
+		t.Fatal("unexpected localSite match without valid CIDRs or MMDB")
+	}
+}
+
+func TestIsAccessChecksRequestedPortOnly(t *testing.T) {
+	t.Parallel()
+
+	origTransport := pingClient.Transport
+	origCache := accessCache
+	t.Cleanup(func() {
+		pingClient.Transport = origTransport
+		accessCache = origCache
+	})
+
+	pingClient.Transport = roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		if req.URL.Scheme != "https" {
+			return nil, errors.New("scheme unavailable")
+		}
+		return &http.Response{
+			StatusCode: http.StatusOK,
+			Body:       io.NopCloser(strings.NewReader("")),
+			Header:     make(http.Header),
+		}, nil
+	})
+	accessCache = mem.NewRotateCache(time.Hour, httpPing)
+
+	r := NewRouter(nil, "", "223.5.5.5", "", nil)
+	if !r.isAccess("example.com", 443) {
+		t.Fatal("expected HTTPS probe to succeed")
+	}
+	if r.isAccess("example.com", 80) {
+		t.Fatal("expected HTTP probe to fail")
+	}
+}
+
+func TestServeDNSForProxyRuleForwardsNonAddressQuestion(t *testing.T) {
+	t.Parallel()
+
+	udpConn, err := net.ListenPacket("udp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("listen udp: %v", err)
+	}
+	defer udpConn.Close()
+
+	handler := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		resp := new(dns.Msg)
+		resp.SetReply(req)
+		resp.Answer = []dns.RR{&dns.TXT{
+			Hdr: dns.RR_Header{Name: req.Question[0].Name, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 20},
+			Txt: []string{"forwarded"},
+		}}
+		_ = w.WriteMsg(resp)
+	})
+
+	server := &dns.Server{PacketConn: udpConn, Handler: handler}
+	go func() { _ = server.ActivateAndServe() }()
+	t.Cleanup(func() {
+		_ = server.Shutdown()
+	})
+
+	r := NewRouter([]string{"127.0.0.2"}, "", "223.5.5.5", "", nil)
+	r.BlockRule = suffixtree.NewNodeFromRules()
+	r.DirectRule = suffixtree.NewNodeFromRules()
+	r.ProxyRule = suffixtree.NewNodeFromRules("example.com.")
+	r.dns.upstreamAddrs = []string{udpConn.LocalAddr().String()}
+	r.dns.upstreamIndex = 0
+
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeTXT)
+	writer := &mockDNSWriter{localAddr: &net.UDPAddr{IP: net.ParseIP("127.0.0.2"), Port: 53}}
+
+	r.ServeDNS(writer, req)
+
+	if writer.msg == nil {
+		t.Fatal("expected response message")
+	}
+	if writer.msg.Rcode != dns.RcodeSuccess {
+		t.Fatalf("expected successful response, got rcode %d", writer.msg.Rcode)
+	}
+	if len(writer.msg.Answer) != 1 {
+		t.Fatalf("expected forwarded TXT answer, got %d answers", len(writer.msg.Answer))
+	}
+	answer, ok := writer.msg.Answer[0].(*dns.TXT)
+	if !ok {
+		t.Fatalf("expected TXT record, got %T", writer.msg.Answer[0])
+	}
+	if len(answer.Txt) != 1 || answer.Txt[0] != "forwarded" {
+		t.Fatalf("unexpected TXT payload: %v", answer.Txt)
+	}
+}
+
+func TestServeDNSForProxyRuleSuppressesHTTPSQuestion(t *testing.T) {
+	t.Parallel()
+
+	udpConn, err := net.ListenPacket("udp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("listen udp: %v", err)
+	}
+	defer udpConn.Close()
+
+	var upstreamQueries atomic.Int32
+	handler := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		upstreamQueries.Add(1)
+		resp := new(dns.Msg)
+		resp.SetReply(req)
+		_ = w.WriteMsg(resp)
+	})
+
+	server := &dns.Server{PacketConn: udpConn, Handler: handler}
+	go func() { _ = server.ActivateAndServe() }()
+	t.Cleanup(func() {
+		_ = server.Shutdown()
+	})
+
+	r := NewRouter([]string{"127.0.0.2"}, "", "223.5.5.5", "", nil)
+	r.BlockRule = suffixtree.NewNodeFromRules()
+	r.DirectRule = suffixtree.NewNodeFromRules()
+	r.ProxyRule = suffixtree.NewNodeFromRules("example.com.")
+	r.dns.upstreamAddrs = []string{udpConn.LocalAddr().String()}
+	r.dns.upstreamIndex = 0
+
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeHTTPS)
+	writer := &mockDNSWriter{localAddr: &net.UDPAddr{IP: net.ParseIP("127.0.0.2"), Port: 53}}
+
+	r.ServeDNS(writer, req)
+
+	if writer.msg == nil {
+		t.Fatal("expected response message")
+	}
+	if writer.msg.Rcode != dns.RcodeSuccess {
+		t.Fatalf("expected successful response, got rcode %d", writer.msg.Rcode)
+	}
+	if len(writer.msg.Answer) != 0 {
+		t.Fatalf("expected NODATA response, got %d answers", len(writer.msg.Answer))
+	}
+	if upstreamQueries.Load() != 0 {
+		t.Fatalf("expected HTTPS query to be suppressed locally, got %d upstream queries", upstreamQueries.Load())
+	}
+}
+
+func TestServeDNSForProxyRuleForwardsSRVQuestion(t *testing.T) {
+	t.Parallel()
+
+	udpConn, err := net.ListenPacket("udp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("listen udp: %v", err)
+	}
+	defer udpConn.Close()
+
+	var upstreamQueries atomic.Int32
+	handler := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		upstreamQueries.Add(1)
+		resp := new(dns.Msg)
+		resp.SetReply(req)
+		resp.Answer = []dns.RR{&dns.SRV{
+			Hdr:      dns.RR_Header{Name: req.Question[0].Name, Rrtype: dns.TypeSRV, Class: dns.ClassINET, Ttl: 20},
+			Priority: 10,
+			Weight:   5,
+			Port:     5222,
+			Target:   "srv.example.com.",
+		}}
+		_ = w.WriteMsg(resp)
+	})
+
+	server := &dns.Server{PacketConn: udpConn, Handler: handler}
+	go func() { _ = server.ActivateAndServe() }()
+	t.Cleanup(func() {
+		_ = server.Shutdown()
+	})
+
+	r := NewRouter([]string{"127.0.0.2"}, "", "223.5.5.5", "", nil)
+	r.BlockRule = suffixtree.NewNodeFromRules()
+	r.DirectRule = suffixtree.NewNodeFromRules()
+	r.ProxyRule = suffixtree.NewNodeFromRules("example.com.")
+	r.dns.upstreamAddrs = []string{udpConn.LocalAddr().String()}
+	r.dns.upstreamIndex = 0
+
+	req := new(dns.Msg)
+	req.SetQuestion("_xmpp-client._tcp.example.com.", dns.TypeSRV)
+	writer := &mockDNSWriter{localAddr: &net.UDPAddr{IP: net.ParseIP("127.0.0.2"), Port: 53}}
+
+	r.ServeDNS(writer, req)
+
+	if writer.msg == nil {
+		t.Fatal("expected response message")
+	}
+	if writer.msg.Rcode != dns.RcodeSuccess {
+		t.Fatalf("expected successful response, got rcode %d", writer.msg.Rcode)
+	}
+	if len(writer.msg.Answer) != 1 {
+		t.Fatalf("expected forwarded SRV answer, got %d answers", len(writer.msg.Answer))
+	}
+	answer, ok := writer.msg.Answer[0].(*dns.SRV)
+	if !ok {
+		t.Fatalf("expected SRV record, got %T", writer.msg.Answer[0])
+	}
+	if answer.Target != "srv.example.com." || answer.Port != 5222 {
+		t.Fatalf("unexpected SRV answer: target=%s port=%d", answer.Target, answer.Port)
+	}
+	if upstreamQueries.Load() != 1 {
+		t.Fatalf("expected SRV query to be forwarded once, got %d upstream queries", upstreamQueries.Load())
+	}
+}
+
+func TestServeDNSForProxyRuleReturnsNoDataWhenAddressFamilyUnavailable(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "", "223.5.5.5", "", nil)
+	r.BlockRule = suffixtree.NewNodeFromRules()
+	r.DirectRule = suffixtree.NewNodeFromRules()
+	r.ProxyRule = suffixtree.NewNodeFromRules("example.com.")
+
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeAAAA)
+	writer := &mockDNSWriter{localAddr: &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 53}}
+
+	r.ServeDNS(writer, req)
+
+	if writer.msg == nil {
+		t.Fatal("expected response message")
+	}
+	if writer.msg.Rcode != dns.RcodeSuccess {
+		t.Fatalf("expected successful response, got rcode %d", writer.msg.Rcode)
+	}
+	if len(writer.msg.Answer) != 0 {
+		t.Fatalf("expected NODATA response, got %d answers", len(writer.msg.Answer))
+	}
+}
+
+func TestBuildUpstreamAddrsIsPerRouter(t *testing.T) {
+	t.Parallel()
+
+	r1 := NewRouter([]string{"127.0.0.1"}, "1.1.1.1", "9.9.9.9", "", nil)
+	r2 := NewRouter([]string{"127.0.0.2"}, "8.8.8.8", "4.4.4.4", "", nil)
+
+	addrs1, err := r1.buildUpstreamAddrs()
+	if err != nil {
+		t.Fatalf("buildUpstreamAddrs r1 failed: %v", err)
+	}
+	addrs2, err := r2.buildUpstreamAddrs()
+	if err != nil {
+		t.Fatalf("buildUpstreamAddrs r2 failed: %v", err)
+	}
+
+	if strings.Join(addrs1, ",") == strings.Join(addrs2, ",") {
+		t.Fatalf("expected router-specific upstreams, got %v and %v", addrs1, addrs2)
+	}
+}
+
+func TestCurrentUpstreamStateSchedulesPreferredProbeAfterRetryInterval(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "1.1.1.1", "9.9.9.9", "", nil)
+	r.dns.upstreamAddrs = []string{"1.1.1.1:53", "9.9.9.9:53"}
+	r.dns.upstreamIndex = 1
+	r.dns.retryAt = time.Now().Add(-time.Second)
+
+	_, index, shouldProbe, err := r.currentUpstreamState(time.Now())
+	if err != nil {
+		t.Fatalf("currentUpstreamState failed: %v", err)
+	}
+	if index != 1 {
+		t.Fatalf("expected current degraded upstream index 1, got %d", index)
+	}
+	if !shouldProbe {
+		t.Fatal("expected preferred upstream probe to be scheduled")
+	}
+}
+
+func TestCurrentUpstreamStateAllowsOnlyOnePreferredProbe(t *testing.T) {
+	t.Parallel()
+
+	now := time.Now()
+	r := NewRouter([]string{"127.0.0.1"}, "1.1.1.1", "9.9.9.9", "", nil)
+	r.dns.upstreamAddrs = []string{"1.1.1.1:53", "9.9.9.9:53"}
+	r.dns.upstreamIndex = 1
+	r.dns.retryAt = now.Add(-time.Second)
+
+	_, _, shouldProbe, err := r.currentUpstreamState(now)
+	if err != nil {
+		t.Fatalf("currentUpstreamState failed: %v", err)
+	}
+	if !shouldProbe {
+		t.Fatal("expected first caller to probe preferred upstream")
+	}
+
+	_, _, shouldProbe, err = r.currentUpstreamState(now)
+	if err != nil {
+		t.Fatalf("currentUpstreamState second call failed: %v", err)
+	}
+	if shouldProbe {
+		t.Fatal("expected second caller to reuse in-flight probe state")
+	}
+}
+
+func TestDegradeUpstreamMovesTowardFallback(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "1.1.1.1", "9.9.9.9", "", nil)
+	r.dns.upstreamAddrs = []string{"1.1.1.1:53", "9.9.9.9:53"}
+	r.dns.upstreamIndex = 0
+
+	index, switched := r.degradeUpstream(0)
+	if !switched {
+		t.Fatal("expected upstream switch")
+	}
+	if index != 1 {
+		t.Fatalf("expected fallback index 1, got %d", index)
+	}
+	if r.dns.retryAt.IsZero() {
+		t.Fatal("expected retry deadline to be set")
+	}
+}
+
+func TestPromoteUpstreamRestoresPreferredAndClearsRetry(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "1.1.1.1", "9.9.9.9", "", nil)
+	r.dns.upstreamAddrs = []string{"1.1.1.1:53", "9.9.9.9:53"}
+	r.dns.upstreamIndex = 1
+	r.dns.retryAt = time.Now().Add(time.Minute)
+
+	r.promoteUpstream()
+
+	if r.dns.upstreamIndex != 0 {
+		t.Fatalf("expected preferred index 0, got %d", r.dns.upstreamIndex)
+	}
+	if !r.dns.retryAt.IsZero() {
+		t.Fatal("expected retry deadline to be cleared")
+	}
+}
+
+func TestCurrentUpstreamStateRefreshesDHCPUpstreams(t *testing.T) {
+	t.Parallel()
+
+	var calls atomic.Int32
+	r := NewRouter([]string{"127.0.0.1"}, "", "9.9.9.9", "", nil)
+	r.dns.getDNSServer = func() ([]string, error) {
+		if calls.Add(1) == 1 {
+			return []string{"1.1.1.1"}, nil
+		}
+		return []string{"8.8.8.8"}, nil
+	}
+
+	now := time.Now()
+	addrs, index, shouldProbe, err := r.currentUpstreamState(now)
+	if err != nil {
+		t.Fatalf("initial currentUpstreamState failed: %v", err)
+	}
+	if index != 0 || shouldProbe {
+		t.Fatalf("unexpected initial state: index=%d shouldProbe=%v", index, shouldProbe)
+	}
+	if strings.Join(addrs, ",") != "1.1.1.1:53,9.9.9.9:53" {
+		t.Fatalf("unexpected initial upstreams: %v", addrs)
+	}
+
+	addrs, index, shouldProbe, err = r.currentUpstreamState(now.Add(dnsRefreshTTL + time.Second))
+	if err != nil {
+		t.Fatalf("refreshed currentUpstreamState failed: %v", err)
+	}
+	if index != 0 || shouldProbe {
+		t.Fatalf("unexpected refreshed state: index=%d shouldProbe=%v", index, shouldProbe)
+	}
+	if strings.Join(addrs, ",") != "8.8.8.8:53,9.9.9.9:53" {
+		t.Fatalf("unexpected refreshed upstreams: %v", addrs)
+	}
+}
+
+func TestCurrentUpstreamStateBacksOffInitialDHCPFailure(t *testing.T) {
+	t.Parallel()
+
+	var calls atomic.Int32
+	r := NewRouter([]string{"127.0.0.1"}, "", "", "", nil)
+	r.dns.getDNSServer = func() ([]string, error) {
+		calls.Add(1)
+		return nil, errors.New("dhcp unavailable")
+	}
+
+	now := time.Now()
+	if _, _, _, err := r.currentUpstreamState(now); err == nil {
+		t.Fatal("expected initial DHCP failure")
+	}
+	if calls.Load() != 1 {
+		t.Fatalf("expected one DHCP call, got %d", calls.Load())
+	}
+
+	if _, _, _, err := r.currentUpstreamState(now.Add(time.Second)); err == nil {
+		t.Fatal("expected cached DHCP failure during backoff")
+	}
+	if calls.Load() != 1 {
+		t.Fatalf("expected no extra DHCP call during backoff, got %d", calls.Load())
+	}
+}
+
+func TestCurrentUpstreamStateRefreshDoesNotBlockConcurrentReaders(t *testing.T) {
+	t.Parallel()
+
+	startRefresh := make(chan struct{})
+	releaseRefresh := make(chan struct{})
+	var calls atomic.Int32
+
+	r := NewRouter([]string{"127.0.0.1"}, "", "9.9.9.9", "", nil)
+	r.dns.upstreamAddrs = []string{"1.1.1.1:53", "9.9.9.9:53"}
+	r.dns.upstreamIndex = 0
+	r.dns.refreshAt = time.Now().Add(-time.Second)
+	r.dns.getDNSServer = func() ([]string, error) {
+		if calls.Add(1) == 1 {
+			close(startRefresh)
+			<-releaseRefresh
+		}
+		return []string{"8.8.8.8"}, nil
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		_, _, _, _ = r.currentUpstreamState(time.Now())
+	}()
+
+	<-startRefresh
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		addrs, index, shouldProbe, err := r.currentUpstreamState(time.Now())
+		if err != nil {
+			t.Errorf("concurrent currentUpstreamState failed: %v", err)
+			return
+		}
+		if index != 0 || shouldProbe {
+			t.Errorf("unexpected concurrent state: index=%d shouldProbe=%v", index, shouldProbe)
+			return
+		}
+		if strings.Join(addrs, ",") != "1.1.1.1:53,9.9.9.9:53" {
+			t.Errorf("unexpected concurrent upstreams: %v", addrs)
+		}
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(200 * time.Millisecond):
+		t.Fatal("concurrent reader blocked on refresh lock")
+	}
+
+	close(releaseRefresh)
+	wg.Wait()
+}
+
+func TestCurrentUpstreamStateUsesFallbackWhileInitialRefreshInFlight(t *testing.T) {
+	t.Parallel()
+
+	startRefresh := make(chan struct{})
+	releaseRefresh := make(chan struct{})
+
+	r := NewRouter([]string{"127.0.0.1"}, "", "9.9.9.9", "", nil)
+	r.dns.getDNSServer = func() ([]string, error) {
+		close(startRefresh)
+		<-releaseRefresh
+		return []string{"1.1.1.1"}, nil
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		_, _, _, _ = r.currentUpstreamState(time.Now())
+	}()
+
+	<-startRefresh
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		addrs, index, shouldProbe, err := r.currentUpstreamState(time.Now())
+		if err != nil {
+			t.Errorf("currentUpstreamState during initial refresh failed: %v", err)
+			return
+		}
+		if index != 0 || shouldProbe {
+			t.Errorf("unexpected fallback state: index=%d shouldProbe=%v", index, shouldProbe)
+			return
+		}
+		if strings.Join(addrs, ",") != "9.9.9.9:53" {
+			t.Errorf("expected fallback-only upstreams, got %v", addrs)
+		}
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(200 * time.Millisecond):
+		t.Fatal("concurrent caller blocked instead of using fallback")
+	}
+
+	close(releaseRefresh)
+	wg.Wait()
+}
+
+func TestCurrentUpstreamStatePreservesProbeWhenRefreshIsDue(t *testing.T) {
+	t.Parallel()
+
+	now := time.Now()
+	r := NewRouter([]string{"127.0.0.1"}, "", "9.9.9.9", "", nil)
+	r.dns.upstreamAddrs = []string{"1.1.1.1:53", "9.9.9.9:53"}
+	r.dns.upstreamIndex = 1
+	r.dns.retryAt = now.Add(-time.Second)
+	r.dns.refreshAt = now.Add(-time.Second)
+	r.dns.getDNSServer = func() ([]string, error) {
+		return []string{"8.8.8.8"}, nil
+	}
+
+	addrs, index, shouldProbe, err := r.currentUpstreamState(now)
+	if err != nil {
+		t.Fatalf("currentUpstreamState with refresh failed: %v", err)
+	}
+	if !shouldProbe {
+		t.Fatal("expected refresh to preserve due preferred probe")
+	}
+	if index != 1 {
+		t.Fatalf("expected degraded upstream to be preserved across refresh, got %d", index)
+	}
+	if strings.Join(addrs, ",") != "8.8.8.8:53,9.9.9.9:53" {
+		t.Fatalf("unexpected refreshed upstreams: %v", addrs)
+	}
+	if !r.dns.probeInFlight {
+		t.Fatal("expected probe to be marked in-flight after refresh")
+	}
+	if !r.dns.retryAt.After(now) {
+		t.Fatalf("expected retryAt to be pushed forward after scheduling probe, got %v", r.dns.retryAt)
+	}
+}
+
+func TestServeDNSReturnsNXDomainForBlockedDomain(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "", "223.5.5.5", "", nil)
+	r.BlockRule = suffixtree.NewNodeFromRules("example.com.")
+	r.DirectRule = suffixtree.NewNodeFromRules()
+	r.ProxyRule = suffixtree.NewNodeFromRules()
+
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeA)
+
+	writer := &mockDNSWriter{localAddr: &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 53}}
+	r.ServeDNS(writer, req)
+
+	if writer.msg == nil {
+		t.Fatal("expected response message")
+	}
+	if writer.msg.Rcode != dns.RcodeNameError {
+		t.Fatalf("expected NXDOMAIN, got %d", writer.msg.Rcode)
+	}
+}
+
+func TestServeDNSRejectsMultipleQuestions(t *testing.T) {
+	t.Parallel()
+
+	r := NewRouter([]string{"127.0.0.1"}, "", "223.5.5.5", "", nil)
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeA)
+	req.Question = append(req.Question, dns.Question{Name: "example.org.", Qtype: dns.TypeA, Qclass: dns.ClassINET})
+
+	writer := &mockDNSWriter{localAddr: &net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 53}}
+	r.ServeDNS(writer, req)
+
+	if writer.msg == nil {
+		t.Fatal("expected response message")
+	}
+	if writer.msg.Rcode != dns.RcodeFormatError {
+		t.Fatalf("expected format error, got %d", writer.msg.Rcode)
+	}
+}
+
+func TestExchangeWithRetryFallsBackToTCPOnTruncatedUDP(t *testing.T) {
+	t.Parallel()
+
+	udpConn, err := net.ListenPacket("udp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("listen udp: %v", err)
+	}
+	defer udpConn.Close()
+
+	tcpLn, err := net.Listen("tcp", net.JoinHostPort("127.0.0.1", strings.Split(udpConn.LocalAddr().String(), ":")[1]))
+	if err != nil {
+		t.Fatalf("listen tcp: %v", err)
+	}
+	defer tcpLn.Close()
+
+	var tcpQueries atomic.Int32
+	handler := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		resp := new(dns.Msg)
+		resp.SetReply(req)
+		if _, ok := w.RemoteAddr().(*net.TCPAddr); ok {
+			tcpQueries.Add(1)
+			resp.Answer = []dns.RR{&dns.A{
+				Hdr: dns.RR_Header{Name: req.Question[0].Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 20},
+				A:   net.ParseIP("127.0.0.1"),
+			}}
+		} else {
+			resp.Truncated = true
+		}
+		_ = w.WriteMsg(resp)
+	})
+
+	udpServer := &dns.Server{PacketConn: udpConn, Handler: handler}
+	tcpServer := &dns.Server{Listener: tcpLn, Handler: handler}
+	go func() { _ = udpServer.ActivateAndServe() }()
+	go func() { _ = tcpServer.ActivateAndServe() }()
+	t.Cleanup(func() {
+		_ = udpServer.Shutdown()
+		_ = tcpServer.Shutdown()
+	})
+
+	r := NewRouter(nil, "", "223.5.5.5", "", nil)
+	req := new(dns.Msg)
+	req.SetQuestion("example.com.", dns.TypeA)
+
+	resp, err := r.exchangeWithRetry(req, udpConn.LocalAddr().String())
+	if err != nil {
+		t.Fatalf("exchangeWithRetry failed: %v", err)
+	}
+	if len(resp.Answer) != 1 {
+		t.Fatalf("expected tcp answer, got %d answers", len(resp.Answer))
+	}
+	if tcpQueries.Load() == 0 {
+		t.Fatal("expected TCP fallback query")
+	}
+}
+
+type mockDNSWriter struct {
+	msg       *dns.Msg
+	localAddr net.Addr
+}
+
+func (w *mockDNSWriter) LocalAddr() net.Addr         { return w.localAddr }
+func (w *mockDNSWriter) RemoteAddr() net.Addr        { return &net.UDPAddr{} }
+func (w *mockDNSWriter) WriteMsg(msg *dns.Msg) error { w.msg = msg; return nil }
+func (w *mockDNSWriter) Write([]byte) (int, error)   { return 0, nil }
+func (w *mockDNSWriter) Close() error                { return nil }
+func (w *mockDNSWriter) TsigStatus() error           { return nil }
+func (w *mockDNSWriter) TsigTimersOnly(bool)         {}
+func (w *mockDNSWriter) Hijack()                     {}
@@ -2,17 +2,23 @@ package router

 import (
 	"net"
+	"net/url"
 	"strconv"
 )

-func ParseHostPort(hostport string, defaultPort uint16) (string, uint16, error) {
+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
 	}
-	if port == "" {
-		return host, defaultPort, nil
-	}

 	portInt, err := strconv.ParseUint(port, 10, 16)
 	if err != nil {
@@ -17,7 +17,7 @@ type authReq struct {

 func (req *authReq) Fulfill(r io.Reader) error {
 	buf := make([]byte, 2)
-	if n, err := r.Read(buf); err != nil || n != 2 {
+	if n, err := io.ReadFull(r, buf); err != nil || n != 2 {
 		return err
 	}

@@ -25,7 +25,7 @@ func (req *authReq) Fulfill(r io.Reader) error {
 	req.NMETHODS = buf[1]

 	req.METHODS = make([]byte, int(req.NMETHODS))
-	if n, err := r.Read(req.METHODS); err != nil || n != len(req.METHODS) {
+	if n, err := io.ReadFull(r, req.METHODS); err != nil || n != len(req.METHODS) {
 		return err
 	}

@@ -33,7 +33,15 @@ func (req *authReq) Fulfill(r io.Reader) error {
 }

 func (r *authReq) IsValid() bool {
-	return r.VER == 5 && r.METHODS[0] == 0
+	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
@@ -51,7 +59,7 @@ type reqHead struct {
 }

 func (r *reqHead) IsValid() bool {
-	return r.VER == 5 && r.CMD == 1
+	return r.VER == 5 && r.CMD == 1 && r.RSV == 0
 }

 // 4. server response with the address that assigned to connect to target address
@@ -70,6 +78,7 @@ type addrType interface {
 }

 // ATYP:
+//
 //	0x01 -> net.IPv4len
 //	0x03 -> first byte is length
 //	0x04 -> net.IPv6len
@@ -81,6 +90,7 @@ type addrTypeIPv4 struct {
 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
 }
@@ -108,6 +118,7 @@ func (a *addrTypeDomain) Fulfill(r io.Reader) error {

 	return nil
 }
+
 func (a *addrTypeDomain) Addr() (string, uint16) {
 	return string(a.DST_ADDR[:]), a.DST_PORT
 }
@@ -120,6 +131,7 @@ type addrTypeIPv6 struct {
 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
 }
@@ -28,14 +28,32 @@ func New() *Socks5 {
 	return &Socks5{}
 }

-var noAuthResp = authResp{VER: 5, METHOD: 0}
-var succHeadResp = respHead{VER: 5, REP: 0, RSV: 0, ATYP: 1}
+const (
+	RepSucceeded            = 0x00
+	RepGeneralFailure       = 0x01
+	RepConnectionNotAllowed = 0x02
+)
+
+var (
+	noAuthResp = authResp{VER: 5, METHOD: 0}
+)

 func (s *Socks5) Unwrap(conn net.Conn) (net.Addr, error) {
-	{ //auth
+	addr, err := s.ReadRequest(conn)
+	if err != nil {
+		return nil, err
+	}
+	if err := s.WriteReply(conn, RepSucceeded); err != nil {
+		return nil, errors.Wrap(err, "write head")
+	}
+	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, errors.Errorf("read head: %v, err: %s", auth, err)
+		if err := auth.Fulfill(conn); err != nil || !auth.IsValid() {
+			return nil, errors.Errorf("read auth head: %v, err: %s", auth, err)
 		}

 		if err := binary.Write(conn, binary.BigEndian, noAuthResp); err != nil {
@@ -63,10 +81,6 @@ func (s *Socks5) Unwrap(conn net.Conn) (net.Addr, error) {
 		if err := addr.Fulfill(conn); err != nil {
 			return nil, errors.Wrap(err, "read target")
 		}
-
-		if err := binary.Write(conn, binary.BigEndian, succHeadResp); err != nil {
-			return nil, errors.Wrap(err, "write head")
-		}
 	}

 	return &AddrHead{
@@ -74,6 +88,11 @@ func (s *Socks5) Unwrap(conn net.Conn) (net.Addr, error) {
 	}, 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
@@ -82,6 +101,10 @@ var noAuthReq = struct {
 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 errors.Errorf("target host too long: %d", len(tgtHost))
+	}
+
 	{ // auth
 		if err := binary.Write(conn, binary.BigEndian, &noAuthReq); err != nil {
 			return errors.WithStack(err)
@@ -91,6 +114,9 @@ func (s *Socks5) Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error {
 		if err := binary.Read(conn, binary.BigEndian, resp); err != nil {
 			return errors.WithStack(err)
 		}
+		if resp.VER != 5 || resp.METHOD != 0 {
+			return errors.Errorf("unexpected auth response: %+v", resp)
+		}
 	}
 	{ // head
 		buf := bytes.NewBuffer(make([]byte, 0, binary.Size(domainHead)+1+len(tgtHost)+2))
@@ -99,14 +125,35 @@ func (s *Socks5) Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error {
 		buf.WriteString(tgtHost)
 		buf.Write([]byte{byte(tgtPort >> 8), byte(tgtPort)})

-		if _, err := conn.Write(buf.Bytes()); err != nil {
-			return errors.WithStack(err)
+		if n, err := conn.Write(buf.Bytes()); err != nil || n != len(buf.Bytes()) {
+			return errors.Errorf("n: %d, err: %s", n, err)
 		}

-		head := respHead{}
+		head := reqHead{}
 		if err := binary.Read(conn, binary.BigEndian, &head); err != nil {
 			return errors.WithStack(err)
 		}
+		if head.VER != 5 || head.RSV != 0 {
+			return errors.Errorf("unexpected response head: %+v", head)
+		}
+		if head.CMD != 0 {
+			return errors.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 errors.Errorf("invalid response ATYP: %d", head.ATYP)
+		}
+		if err := addr.Fulfill(conn); err != nil {
+			return errors.Wrap(err, "read response address")
+		}
 	}

 	return nil
@@ -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")
+	}
+}
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"crypto/md5"
 	"encoding/binary"
+	"io"
 	"net"
 	"strconv"

@@ -26,7 +27,10 @@ type Head struct {

 func (h *Head) Network() string { return "tcp" }
 func (h *Head) String() string {
-	idx := bytes.IndexRune(h.TgtAddr[:], 0)
+	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)))
 }
@@ -43,7 +47,7 @@ func New(password string) *Sower {

 func (s *Sower) Unwrap(conn net.Conn) (net.Addr, error) {
 	buf := make([]byte, headSize)
-	if n, err := conn.Read(buf); err != nil || n != headSize {
+	if n, err := io.ReadFull(conn, buf); err != nil || n != headSize {
 		return nil, errors.Errorf("n: %d, err: %s", n, err)
 	}

@@ -63,6 +67,10 @@ func (s *Sower) Unwrap(conn net.Conn) (net.Addr, error) {
 }

 func (s *Sower) Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error {
+	if len(tgtHost) > maxDomainLength {
+		return errors.Errorf("target host too long: %d", len(tgtHost))
+	}
+
 	tgtAddr := [maxDomainLength]byte{}
 	copy(tgtAddr[:len(tgtHost)], []byte(tgtHost))

@@ -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)
+	}
+}
@@ -5,16 +5,11 @@ import (
 	"strings"
 	"testing"

-	"github.com/sower-proxy/conns/teeconn"
-	"github.com/sower-proxy/deferlog/log"
-	"github.com/wweir/sower/transport/sower"
-	"github.com/wweir/sower/transport/trojan"
+	"github.com/sower-proxy/conns/reread"
+	"github.com/sower-proxy/sower/transport/sower"
+	"github.com/sower-proxy/sower/transport/trojan"
 )

-func init() {
-	log.Logger = log.Logger.With().Caller().Logger()
-}
-
 func testPipe(tran Transport) (net.Addr, error) {
 	r, w := net.Pipe()
 	defer r.Close()
@@ -24,7 +19,7 @@ func testPipe(tran Transport) (net.Addr, error) {
 		tran.Wrap(w, "sower", 443)
 	}(w)

-	return tran.Unwrap(teeconn.New(r))
+	return tran.Unwrap(reread.New(r))
 }

 func Test_Transports(t *testing.T) {
@@ -50,6 +50,10 @@ 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
@@ -61,6 +65,10 @@ 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
@@ -71,23 +79,29 @@ func (*domain) Network() string { return "tcp" }
 func (a *domain) String() string {
 	return net.JoinHostPort(a.ADDR, strconv.Itoa(int(a.PORT)))
 }
+
 func (a *domain) Fulfill(r io.Reader) error {
 	buf := make([]byte, 1)
-	if n, err := r.Read(buf); err != nil || n != 1 {
+	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 := r.Read(buf); err != nil || n != addrLen+4 {
+	if n, err := io.ReadFull(r, buf); err != nil || n != addrLen+4 {
 		return errors.Wrap(err, "read doamin failed")
 	}

 	a.ADDR = string(buf[:addrLen])
 	a.PORT = uint16(buf[addrLen])<<8 + uint16(buf[addrLen+1])
+	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

@@ -111,8 +125,7 @@ func New(password string) *Trojan {

 func (t *Trojan) Unwrap(conn net.Conn) (net.Addr, error) {
 	buf := make([]byte, headLen)
-	// do not use io.ReadFull to avoid hang
-	if n, err := conn.Read(buf); err != nil || n != headLen {
+	if n, err := io.ReadFull(conn, buf); err != nil || n != headLen {
 		return nil, errors.Errorf("n: %d, err: %s", n, err)
 	}

@@ -124,23 +137,45 @@ func (t *Trojan) Unwrap(conn net.Conn) (net.Addr, error) {
 	if !bytes.Equal(head.Passwd[:], []byte(t.headPasswd)) {
 		return nil, errors.New("auth fail")
 	}
-
-	head.CMD, head.ATYP = buf[58], buf[59]
+	if head.CRLF != [2]byte{0x0D, 0x0A} {
+		return nil, errors.New("invalid CRLF")
+	}
+	if head.CMD != 0x01 {
+		return nil, errors.Errorf("invalid CMD: %d", head.CMD)
+	}
 	switch head.ATYP {
-	case 0x01: //ipv4
+	case 0x01: // ipv4
 		addr := &ipv4Addr{}
 		err := binary.Read(conn, binary.BigEndian, addr)
-		return addr, errors.Wrap(err, "read addr")
+		if err != nil {
+			return nil, errors.Wrap(err, "read addr")
+		}
+		if !addr.IsValid() {
+			return nil, errors.New("invalid CRLF")
+		}
+		return addr, nil

-	case 0x04: //ipv6
+	case 0x04: // ipv6
 		addr := &ipv6Addr{}
 		err := binary.Read(conn, binary.BigEndian, addr)
-		return addr, errors.Wrap(err, "read addr")
+		if err != nil {
+			return nil, errors.Wrap(err, "read addr")
+		}
+		if !addr.IsValid() {
+			return nil, errors.New("invalid CRLF")
+		}
+		return addr, nil

 	case 0x03: // domain
 		addr := &domain{}
 		err := addr.Fulfill(conn)
-		return addr, errors.Wrap(err, "read addr")
+		if err != nil {
+			return nil, errors.Wrap(err, "read addr")
+		}
+		if !addr.IsValid() {
+			return nil, errors.New("invalid CRLF")
+		}
+		return addr, nil

 	default:
 		return nil, errors.New("invalid ATYP")
@@ -160,6 +195,9 @@ func (t *Trojan) Wrap(conn net.Conn, tgtHost string, tgtPort uint16) error {
 		buf.Write([]byte(ip.To16()))

 	default:
+		if len(tgtHost) > 255 {
+			return errors.Errorf("target host too long: %d", len(tgtHost))
+		}
 		buf.Write(t.headDomain)
 		buf.WriteByte(byte(len(tgtHost)))
 		buf.WriteString(tgtHost)
@@ -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")
+	}
+}
Author	SHA1	Message	Date
root	d514a52497	docs: clarify transparent https routing flow	2026-03-31 11:53:10 +08:00
root	6f0b7d39b6	fix: preserve tls client hello in transparent https proxy	2026-03-31 11:52:56 +08:00
wweir	75156760db	refactor: centralize proxy service startup handling	2026-03-31 10:14:20 +08:00
wweir	23110fc786	docs: clarify config key mapping comments	2026-03-31 10:14:15 +08:00
wweir	71eede9460	fix: align example config with snake case loader	2026-03-31 07:46:32 +08:00
wweir	549ab2a990	fix: fallback to system cache for sowerd service	2026-03-31 07:46:32 +08:00
wweir	8bbf5ca03d	refactor: simplify dns proxy routing checks	2026-03-30 23:12:04 +08:00
wweir	c3ef6ed88f	refactor: merge upstream tls proxy branches	2026-03-30 23:11:58 +08:00
wweir	0c8bdf6d9c	refactor: share upstream tls dial setup	2026-03-30 23:04:21 +08:00
wweir	53c55aef24	refactor: simplify dns proxy replies	2026-03-30 23:03:49 +08:00
wweir	e705dd4dd3	docs: refresh agent collaboration guidelines	2026-03-30 23:03:17 +08:00
wweir	6d410b104b	docs: add architecture and deployment notes	2026-03-30 23:03:07 +08:00
wweir	6ccdcc131b	feat: add sowerd install and startup validation	2026-03-30 23:02:54 +08:00
wweir	2b072584e6	feat: add upstream tls controls for sower	2026-03-30 23:02:38 +08:00
wweir	b2228f8643	refactor: harden routing and transport handling	2026-03-30 23:02:13 +08:00
温习江湖	5ab6acd7c7	Merge pull request #33 from sower-proxy/dependabot/go_modules/golang.org/x/crypto-0.45.0 chore(deps): bump golang.org/x/crypto from 0.37.0 to 0.45.0	2026-01-09 14:28:19 +08:00
dependabot[bot]	a74b1204c0	chore(deps): bump golang.org/x/crypto from 0.37.0 to 0.45.0 Bumps [golang.org/x/crypto](https://github.com/golang/crypto) from 0.37.0 to 0.45.0. - [Commits](https://github.com/golang/crypto/compare/v0.37.0...v0.45.0) --- updated-dependencies: - dependency-name: golang.org/x/crypto dependency-version: 0.45.0 dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com>	2025-11-20 02:29:16 +00:00
wweir	677b0593b8	refactor: update sowerd main.go configuration handling	2025-10-28 20:04:27 +08:00
wweir	af61d38b9e	refactor: extract configuration to dedicated config package	2025-10-27 11:28:42 +08:00
wweir	f7a288af4c	refactor: extract configuration to dedicated config package - Move configuration structures from cmd/sower/main.go and cmd/sowerd/main.go to config package - Add config.SowerConfig and config.SowerdConfig types - Implement Validate() method for configuration validation - Update Go module dependencies to latest versions - Improve code organization and maintainability	2025-09-07 00:10:56 +08:00
wweir	91b7f8e8c1	refactor: rename module from github.com/wweir/sower to github.com/sower-proxy/sower - Update go.mod module declaration - Update all import paths in Go files - Update GitHub links in README.md - All tests pass and build succeeds	2025-09-06 08:27:11 +08:00
wweir	53b1de41d0	Update sower.service to use -c option for config file	2025-08-16 11:03:31 +08:00
温习江湖	6c9b9d9597	Merge pull request #32 from sower-proxy/dependabot/go_modules/golang.org/x/net-0.38.0 chore(deps): bump golang.org/x/net from 0.35.0 to 0.38.0	2025-07-12 06:20:08 +08:00
dependabot[bot]	1d8f0fdabe	chore(deps): bump golang.org/x/net from 0.35.0 to 0.38.0 Bumps [golang.org/x/net](https://github.com/golang/net) from 0.35.0 to 0.38.0. - [Commits](https://github.com/golang/net/compare/v0.35.0...v0.38.0) --- updated-dependencies: - dependency-name: golang.org/x/net dependency-version: 0.38.0 dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com>	2025-06-26 11:30:40 +00:00
wweir	c347e15fe2	fix(stop): avoid unexpected stop	2025-05-14 13:17:18 +08:00
wweir	62176ffb65	feat: support fake site serve directory	2025-04-29 16:18:56 +08:00
wweir	5fe202314d	feat: change log package to log/slog	2025-04-29 14:24:35 +08:00
wweir	fc7183d70e	feat: support force setting upstream dns server	2025-03-18 18:06:33 +08:00
wweir	4a9197a4ec	fix: upstream all failed case	2024-11-03 00:40:23 +08:00
wweir	9eaf27fdcc	fix(dns): serve interface parser	2024-10-12 10:26:29 +08:00
wweir	ea6c2a29ad	feat: reduce dependency on host DNS configuration	2024-10-12 10:10:52 +08:00
wweir	77c4154c7c	fix: http_proxy	2024-10-12 07:20:39 +08:00
wweir	eadb2f0bdf	fix: sync example config with codes	2024-09-23 19:09:22 +08:00