Fix(fd): compile error

$ go mod tidy -compat=1.17

.github/workflows/docker.yml

@@ -3,12 +3,12 @@ name: Publish Docker Image
 on:
   push:
     branches:
-      - dev
+      - 'main'
     tags:
       - '*'
     paths-ignore:
-      - 'docs/**'
       - '**.md'
+      - 'docs/**'
 
 jobs:
 
@@ -45,21 +45,21 @@ jobs:
           username: xjasonlyu
           password: ${{ secrets.CR_PAT }}
 
-      - name: Build and Push (dev)
-        if: github.ref == 'refs/heads/dev'
+      - name: Get Version
+        id: shell
+        run: |
+          echo ::set-output name=version::$(git describe --tags --abbrev=0)
+
+      - name: Build and Push (nightly)
+        if: github.ref == 'refs/heads/main'
         uses: docker/build-push-action@v2
         with:
           context: .
           push: true
           platforms: linux/amd64,linux/arm/v7,linux/arm64
           tags: |
-            xjasonlyu/tun2socks:dev
-            ghcr.io/xjasonlyu/tun2socks:dev
-
-      - name: Get Version
-        id: shell
-        run: |
-          echo ::set-output name=version::$(git describe --tags --abbrev=0)
+            xjasonlyu/tun2socks:nightly
+            ghcr.io/xjasonlyu/tun2socks:nightly
 
       - name: Build and Push (latest)
         if: startsWith(github.ref, 'refs/tags/')

.github/workflows/go.yml

@@ -1,32 +1,31 @@
-name: Go
+name: Go Static Check
 
 on:
-  pull_request:
   push:
     branches:
-      - dev
-    tags:
+      - '*'
+    tags-ignore:
       - '*'
     paths-ignore:
-      - 'docs/**'
-      - 'docker/**'
       - '**.md'
+      - 'docs/**'
+  pull_request:
 
 jobs:
   build:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - name: Setup Go
-        uses: actions/setup-go@v2
-        with:
-          go-version: 1.16.x
-
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
 
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17.x
+
       - name: Cache go module
         uses: actions/cache@v2
         with:
@@ -41,17 +40,3 @@ jobs:
           go vet ./...
           go install honnef.co/go/tools/cmd/staticcheck@latest
           staticcheck -- $(go list ./...)
-
-      - name: Build
-        if: startsWith(github.ref, 'refs/tags/')
-        run: make -j releases
-
-      - name: Upload Release
-        uses: softprops/action-gh-release@v1
-        if: startsWith(github.ref, 'refs/tags/')
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          files: build/*
-          draft: true
-          prerelease: false

.github/workflows/release.yml

@@ -0,0 +1,38 @@
+name: Publish Go Releases
+
+on:
+  push:
+    tags:
+      - '*'
+    paths-ignore:
+      - '**.md'
+      - 'docs/**'
+      - 'docker/**'
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17.x
+
+      - name: Build
+        run: make -j releases
+
+      - name: Upload Releases
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: build/*
+          draft: true
+          prerelease: false

Makefile

@@ -45,6 +45,7 @@ UNIX_ARCH_LIST = \
 WINDOWS_ARCH_LIST = \
 	windows-386 \
 	windows-amd64 \
+	windows-arm64 \
 	windows-arm32v7
 
 all: linux-amd64 darwin-amd64 windows-amd64
@@ -127,6 +128,9 @@ windows-386:
 windows-amd64:
 	GOARCH=amd64 GOOS=windows $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@.exe
 
+windows-arm64:
+	GOARCH=arm64 GOOS=windows $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@.exe
+
 windows-arm32v7:
 	GOARCH=arm GOARM=7 GOOS=windows $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@.exe
 

README.md

@@ -16,25 +16,30 @@ English | [简体中文](README_ZH.md)
 
 ## Features
 
-- **Fully support:** IPv4/IPv6/ICMP/TCP/UDP
-- **Proxy protocol:** Socks5/Shadowsocks
-- **Game ready:** optimized UDP transmission
-- **Pure Go:** no CGO required, stability improved
-- **Router mode:** forwarding packets in LAN
-- **TCP/IP stack:** powered by **[gVisor](https://github.com/google/gvisor)**
-- **High performance:** >2.5Gbps throughput
-
-## Requirements
-
-| Target | Minimum | Recommended |
-| :----- | :-----: | :---------: |
-| System | Linux MacOS Freebsd OpenBSD Windows | Linux or MacOS |
-| Memory | >20MB | >128MB |
-| CPU | ANY | AMD64 or ARM64 |
+- **Network Support**
+  - Dualstack: `IPv4/IPv6`
+  - Forwarder: `TCP/UDP`
+  - Ping Echo: `ICMP`
+- **Platform Support**
+  - Linux
+  - MacOS
+  - Windows
+  - FreeBSD
+  - OpenBSD
+- **Proxy Protocol**
+  - HTTP
+  - Socks4
+  - Socks5
+  - Shadowsocks
+- **Extra Feature**
+  - Improved stability without CGO
+  - Optimized UDP transmission for game
+  - Performed with >2.5Gbps throughput
+  - TCP/IP stack powered by **[gVisor](https://github.com/google/gvisor)**
 
 ## Documentation
 
-Documentations and quick start guides can be found at [Github Wiki](https://github.com/xjasonlyu/tun2socks/wiki).
+Docs and quick start guides can be found at [Github Wiki](https://github.com/xjasonlyu/tun2socks/wiki).
 
 ## Community
 
@@ -51,3 +56,8 @@ Welcome and feel free to ask any questions at [Github Discussions](https://githu
 [GPL-3.0](https://github.com/xjasonlyu/tun2socks/blob/main/LICENSE)
 
 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fxjasonlyu%2Ftun2socks.svg?type=large)](https://app.fossa.com/projects/git%2Bgithub.com%2Fxjasonlyu%2Ftun2socks?ref=badge_large)
+
+
+## Stargazers over time
+
+[![Stargazers over time](https://starchart.cc/xjasonlyu/tun2socks.svg)](https://starchart.cc/xjasonlyu/tun2socks)

README_ZH.md

@@ -26,7 +26,7 @@
 ## 特性介绍
 
 - **全面支持：** IPv4/IPv6/ICMP/TCP/UDP
-- **代理协议：** Socks5/Shadowsocks
+- **代理协议：** HTTP/Socks4/Socks5/Shadowsocks
 - **游戏加速：** 针对UDP传输的优化
 - **纯Go实现：** 无需CGO，稳定性提升
 - **路由模式：** 转发代理局域网内所有流量

component/dialer/bind_others.go

@@ -1,4 +1,4 @@
-// +build !linux,!darwin
+//go:build !linux && !darwin
 
 package dialer
 

component/dialer/fwmark_others.go

@@ -1,4 +1,4 @@
-// +build !linux
+//go:build !linux
 
 package dialer
 

constant/metadata.go

@@ -7,7 +7,7 @@ import (
 	"net"
 	"strconv"
 
-	"github.com/xjasonlyu/tun2socks/component/socks5"
+	"github.com/xjasonlyu/tun2socks/transport/socks5"
 )
 
 const (

core/device/fd/fd.go

@@ -0,0 +1,3 @@
+package fd
+
+const Driver = "fd"

core/device/fd/fd_unix.go

@@ -0,0 +1,41 @@
+//go:build !windows
+
+package fd
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/xjasonlyu/tun2socks/core/device"
+	"golang.org/x/sys/unix"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+type FD struct {
+	stack.LinkEndpoint
+
+	fd  int
+	mtu uint32
+}
+
+func Open(name string, mtu uint32) (device.Device, error) {
+	fd, err := strconv.Atoi(name)
+	if err != nil {
+		return nil, fmt.Errorf("cannot open fd: %s", name)
+	}
+	return open(fd, mtu)
+}
+
+func (f *FD) Type() string {
+	return Driver
+}
+
+func (f *FD) Name() string {
+	return strconv.Itoa(f.fd)
+}
+
+func (f *FD) Close() error {
+	return unix.Close(f.fd)
+}
+
+var _ device.Device = (*FD)(nil)

core/device/fd/fd_windows.go

@@ -0,0 +1,11 @@
+package fd
+
+import (
+	"errors"
+
+	"github.com/xjasonlyu/tun2socks/core/device"
+)
+
+func Open(name string, mtu uint32) (device.Device, error) {
+	return nil, errors.New("not supported")
+}

core/device/fd/open_linux.go

@@ -0,0 +1,24 @@
+package fd
+
+import (
+	"fmt"
+
+	"github.com/xjasonlyu/tun2socks/core/device"
+	"gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
+)
+
+func open(fd int, mtu uint32) (device.Device, error) {
+	f := &FD{fd: fd, mtu: mtu}
+
+	ep, err := fdbased.New(&fdbased.Options{
+		MTU:            mtu,
+		FDs:            []int{fd},
+		EthernetHeader: false,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("create endpoint: %w", err)
+	}
+	f.LinkEndpoint = ep
+
+	return f, nil
+}

core/device/fd/open_others.go

@@ -0,0 +1,23 @@
+//go:build !linux && !windows
+
+package fd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/xjasonlyu/tun2socks/core/device"
+	"github.com/xjasonlyu/tun2socks/core/device/rwbased"
+)
+
+func open(fd int, mtu uint32) (device.Device, error) {
+	f := &FD{fd: fd, mtu: mtu}
+
+	ep, err := rwbased.New(os.NewFile(uintptr(fd), f.Name()), mtu)
+	if err != nil {
+		return nil, fmt.Errorf("create endpoint: %w", err)
+	}
+	f.LinkEndpoint = ep
+
+	return f, nil
+}

core/device/rwbased/endpoint.go

@@ -106,6 +106,10 @@ func (e *Endpoint) WritePackets(_ stack.RouteInfo, pkts stack.PacketBufferList,
 	return n, nil
 }
 
+func (e *Endpoint) WriteRawPacket(packetBuffer *stack.PacketBuffer) tcpip.Error {
+	return &tcpip.ErrNotSupported{}
+}
+
 // MTU implements stack.LinkEndpoint.MTU.
 func (e *Endpoint) MTU() uint32 {
 	return e.mtu

core/device/tun/io_unix.go

@@ -1,4 +1,4 @@
-// +build darwin freebsd openbsd
+//go:build darwin || freebsd || openbsd
 
 package tun
 

core/device/tun/opts.go

@@ -1,15 +0,0 @@
-package tun
-
-type Option func(*TUN)
-
-func WithName(name string) Option {
-	return func(t *TUN) {
-		t.name = name
-	}
-}
-
-func WithMTU(mtu uint32) Option {
-	return func(t *TUN) {
-		t.mtu = mtu
-	}
-}

core/device/tun/tun_gvisor.go

@@ -1,4 +1,4 @@
-// +build linux
+//go:build linux
 
 package tun
 
@@ -23,12 +23,8 @@ type TUN struct {
 	name string
 }
 
-func Open(opts ...Option) (device.Device, error) {
-	t := &TUN{}
-
-	for _, opt := range opts {
-		opt(t)
-	}
+func Open(name string, mtu uint32) (device.Device, error) {
+	t := &TUN{name: name, mtu: mtu}
 
 	if len(t.name) >= unix.IFNAMSIZ {
 		return nil, fmt.Errorf("interface name too long: %s", t.name)
@@ -46,11 +42,11 @@ func Open(opts ...Option) (device.Device, error) {
 		}
 	}
 
-	mtu, err := rawfile.GetMTU(t.name)
+	_mtu, err := rawfile.GetMTU(t.name)
 	if err != nil {
 		return nil, fmt.Errorf("get mtu: %w", err)
 	}
-	t.mtu = mtu
+	t.mtu = _mtu
 
 	ep, err := fdbased.New(&fdbased.Options{
 		MTU: t.mtu,

core/device/tun/tun_wireguard.go

@@ -1,4 +1,4 @@
-// +build !linux
+//go:build !linux
 
 package tun
 
@@ -19,12 +19,8 @@ type TUN struct {
 	name string
 }
 
-func Open(opts ...Option) (device.Device, error) {
-	t := &TUN{}
-
-	for _, opt := range opts {
-		opt(t)
-	}
+func Open(name string, mtu uint32) (device.Device, error) {
+	t := &TUN{name: name, mtu: mtu}
 
 	forcedMTU := defaultMTU
 	if t.mtu > 0 {
@@ -37,11 +33,11 @@ func Open(opts ...Option) (device.Device, error) {
 	}
 	t.nt = nt.(*tun.NativeTun)
 
-	mtu, err := nt.MTU()
+	_mtu, err := nt.MTU()
 	if err != nil {
 		return nil, fmt.Errorf("get mtu: %w", err)
 	}
-	t.mtu = uint32(mtu)
+	t.mtu = uint32(_mtu)
 
 	ep, err := rwbased.New(t, t.mtu)
 	if err != nil {

engine/parse.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/xjasonlyu/tun2socks/core/device"
+	"github.com/xjasonlyu/tun2socks/core/device/fd"
 	"github.com/xjasonlyu/tun2socks/core/device/tun"
 	"github.com/xjasonlyu/tun2socks/proxy"
 	"github.com/xjasonlyu/tun2socks/proxy/proto"
@@ -14,7 +15,7 @@ import (
 
 func parseDevice(s string, mtu uint32) (device.Device, error) {
 	if !strings.Contains(s, "://") {
-		s = tun.Driver + "://" + s /* default driver */
+		s = fmt.Sprintf("%s://%s", tun.Driver /* default driver */, s)
 	}
 
 	u, err := url.Parse(s)
@@ -26,8 +27,10 @@ func parseDevice(s string, mtu uint32) (device.Device, error) {
 	driver := strings.ToLower(u.Scheme)
 
 	switch driver {
+	case fd.Driver:
+		return fd.Open(name, mtu)
 	case tun.Driver:
-		return tun.Open(tun.WithName(name), tun.WithMTU(mtu))
+		return tun.Open(name, mtu)
 	default:
 		return nil, fmt.Errorf("unsupported driver: %s", driver)
 	}
@@ -35,7 +38,7 @@ func parseDevice(s string, mtu uint32) (device.Device, error) {
 
 func parseProxy(s string) (proxy.Proxy, error) {
 	if !strings.Contains(s, "://") {
-		s = proto.Socks5.String() + "://" + s /* default protocol */
+		s = fmt.Sprintf("%s://%s", proto.Socks5 /* default protocol */, s)
 	}
 
 	u, err := url.Parse(s)
@@ -48,8 +51,14 @@ func parseProxy(s string) (proxy.Proxy, error) {
 	switch protocol {
 	case proto.Direct.String():
 		return proxy.NewDirect(), nil
+	case proto.Reject.String():
+		return proxy.NewReject(), nil
+	case proto.HTTP.String():
+		return proxy.NewHTTP(parseHTTP(u))
+	case proto.Socks4.String():
+		return proxy.NewSocks4(parseSocks4(u))
 	case proto.Socks5.String():
-		return proxy.NewSocks5(parseSocks(u))
+		return proxy.NewSocks5(parseSocks5(u))
 	case proto.Shadowsocks.String():
 		return proxy.NewShadowsocks(parseShadowsocks(u))
 	default:
@@ -57,13 +66,28 @@ func parseProxy(s string) (proxy.Proxy, error) {
 	}
 }
 
-func parseSocks(u *url.URL) (address, username, password string) {
-	address = u.Host
-	username = u.User.Username()
+func parseHTTP(u *url.URL) (address, username, password string) {
+	address, username = u.Host, u.User.Username()
 	password, _ = u.User.Password()
 	return
 }
 
+func parseSocks4(u *url.URL) (address, username string) {
+	address, username = u.Host, u.User.Username()
+	return
+}
+
+func parseSocks5(u *url.URL) (address, username, password string) {
+	address, username = u.Host, u.User.Username()
+	password, _ = u.User.Password()
+
+	// Socks5 over UDS
+	if address == "" {
+		address = u.Path
+	}
+	return
+}
+
 func parseShadowsocks(u *url.URL) (address, method, password, obfsMode, obfsHost string) {
 	address = u.Host
 

go.mod

@@ -1,22 +1,28 @@
 module github.com/xjasonlyu/tun2socks
 
-go 1.16
+go 1.17
 
 require (
 	github.com/Dreamacro/go-shadowsocks2 v0.1.7
 	github.com/go-chi/chi v4.1.2+incompatible
 	github.com/go-chi/cors v1.2.0
 	github.com/go-chi/render v1.0.1
-	github.com/gofrs/uuid v4.0.0+incompatible
-	github.com/google/btree v1.0.1 // indirect
+	github.com/gofrs/uuid v4.1.0+incompatible
 	github.com/gorilla/websocket v1.4.2
 	github.com/sirupsen/logrus v1.8.1
 	github.com/stretchr/testify v1.7.0
-	go.uber.org/atomic v1.7.0
-	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a // indirect
-	golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect
-	golang.org/x/sys v0.0.0-20210531080801-fdfd190a6549
-	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
-	golang.zx2c4.com/wireguard v0.0.0-20210525143454-64cb82f2b3f5
-	gvisor.dev/gvisor v0.0.0-20210528151111-2153eaa44276
+	go.uber.org/atomic v1.9.0
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
+	golang.org/x/net v0.0.0-20211029224645-99673261e6eb // indirect
+	golang.org/x/sys v0.0.0-20211031064116-611d5d643895
+	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
+	golang.zx2c4.com/wireguard v0.0.0-20211030003956-52704c4b9288
+	gvisor.dev/gvisor v0.0.0-20211029210705-806fa5c3235c
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/google/btree v1.0.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )

go.sum

@@ -1,632 +1,51 @@
-bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
-cloud.google.com/go v0.75.0/go.mod h1:VGuuCn7PG0dwsd5XPVm2Mm3wlh3EL55/79EKB6hlPTY=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
-cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
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-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
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-k8s.io/apimachinery v0.16.13/go.mod h1:4HMHS3mDHtVttspuuhrJ1GGr/0S9B6iWYWZ57KnnZqQ=
-k8s.io/apimachinery v0.16.14-rc.0/go.mod h1:4HMHS3mDHtVttspuuhrJ1GGr/0S9B6iWYWZ57KnnZqQ=
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-k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
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-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
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+gvisor.dev/gvisor v0.0.0-20211029210705-806fa5c3235c/go.mod h1:btyTBPTxT8AFMvW7yctFJ2nPCEDWZLpmKQEZ0gG+bbQ=

proxy/base.go

@@ -16,10 +16,6 @@ type Base struct {
 	proto proto.Proto
 }
 
-func NewBase(addr string, proto proto.Proto) *Base {
-	return &Base{addr: addr, proto: proto}
-}
-
 func (b *Base) Addr() string {
 	return b.addr
 }

proxy/http.go

@@ -0,0 +1,97 @@
+package proxy
+
+// Ref: https://github.com/Dreamacro/clash/adapter/outbound/http
+
+import (
+	"bufio"
+	"context"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+
+	"github.com/xjasonlyu/tun2socks/component/dialer"
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+)
+
+type HTTP struct {
+	*Base
+
+	user string
+	pass string
+}
+
+func NewHTTP(addr, user, pass string) (*HTTP, error) {
+	return &HTTP{
+		Base: &Base{
+			addr:  addr,
+			proto: proto.HTTP,
+		},
+		user: user,
+		pass: pass,
+	}, nil
+}
+
+func (h *HTTP) DialContext(ctx context.Context, metadata *M.Metadata) (c net.Conn, err error) {
+	c, err = dialer.DialContext(ctx, "tcp", h.Addr())
+	if err != nil {
+		return nil, fmt.Errorf("connect to %s: %w", h.Addr(), err)
+	}
+	setKeepAlive(c)
+
+	defer safeConnClose(c, err)
+
+	err = h.shakeHand(metadata, c)
+	return
+}
+
+func (h *HTTP) shakeHand(metadata *M.Metadata, rw io.ReadWriter) error {
+	addr := metadata.DestinationAddress()
+	req := &http.Request{
+		Method: http.MethodConnect,
+		URL: &url.URL{
+			Host: addr,
+		},
+		Host: addr,
+		Header: http.Header{
+			"Proxy-Connection": []string{"Keep-Alive"},
+		},
+	}
+
+	if h.user != "" && h.pass != "" {
+		auth := h.user + ":" + h.pass
+		req.Header.Add("Proxy-Authorization",
+			fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(auth))))
+	}
+
+	if err := req.Write(rw); err != nil {
+		return err
+	}
+
+	resp, err := http.ReadResponse(bufio.NewReader(rw), req)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode == http.StatusOK {
+		return nil
+	}
+
+	if resp.StatusCode == http.StatusProxyAuthRequired {
+		return errors.New("HTTP need auth")
+	}
+
+	if resp.StatusCode == http.StatusMethodNotAllowed {
+		return errors.New("CONNECT method not allowed by proxy")
+	}
+
+	if resp.StatusCode >= http.StatusInternalServerError {
+		return errors.New(resp.Status)
+	}
+
+	return fmt.Errorf("HTTP connect status code: %d", resp.StatusCode)
+}

proxy/proto/proto.go

@@ -4,8 +4,11 @@ import "fmt"
 
 const (
 	Direct Proto = iota
-	Shadowsocks
+	Reject
+	HTTP
+	Socks4
 	Socks5
+	Shadowsocks
 )
 
 type Proto uint8
@@ -14,10 +17,16 @@ func (proto Proto) String() string {
 	switch proto {
 	case Direct:
 		return "direct"
-	case Shadowsocks:
-		return "ss"
+	case Reject:
+		return "reject"
+	case HTTP:
+		return "http"
+	case Socks4:
+		return "socks4"
 	case Socks5:
 		return "socks5"
+	case Shadowsocks:
+		return "ss"
 	default:
 		return fmt.Sprintf("proto(%d)", proto)
 	}

proxy/reject.go

@@ -0,0 +1,32 @@
+package proxy
+
+import (
+	"context"
+	"errors"
+	"net"
+
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+)
+
+var _ Proxy = (*Reject)(nil)
+
+type Reject struct {
+	*Base
+}
+
+func NewReject() *Reject {
+	return &Reject{
+		Base: &Base{
+			proto: proto.Reject,
+		},
+	}
+}
+
+func (r *Reject) DialContext(context.Context, *M.Metadata) (net.Conn, error) {
+	return nil, errors.New("TCP rejected")
+}
+
+func (r *Reject) DialUDP(*M.Metadata) (net.PacketConn, error) {
+	return nil, errors.New("UDP rejected")
+}

proxy/shadowsocks.go

@@ -8,9 +8,9 @@ import (
 
 	"github.com/xjasonlyu/tun2socks/component/dialer"
 	obfs "github.com/xjasonlyu/tun2socks/component/simple-obfs"
-	"github.com/xjasonlyu/tun2socks/component/socks5"
 	M "github.com/xjasonlyu/tun2socks/constant"
 	"github.com/xjasonlyu/tun2socks/proxy/proto"
+	"github.com/xjasonlyu/tun2socks/transport/socks5"
 
 	"github.com/Dreamacro/go-shadowsocks2/core"
 )
@@ -50,11 +50,7 @@ func (ss *Shadowsocks) DialContext(ctx context.Context, metadata *M.Metadata) (c
 	}
 	setKeepAlive(c)
 
-	defer func() {
-		if err != nil && c != nil {
-			c.Close()
-		}
-	}()
+	defer safeConnClose(c, err)
 
 	switch ss.obfsMode {
 	case "tls":

proxy/socks4.go

@@ -0,0 +1,43 @@
+package proxy
+
+import (
+	"context"
+	"fmt"
+	"net"
+
+	"github.com/xjasonlyu/tun2socks/component/dialer"
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+	"github.com/xjasonlyu/tun2socks/transport/socks4"
+)
+
+var _ Proxy = (*Socks4)(nil)
+
+type Socks4 struct {
+	*Base
+
+	userID string
+}
+
+func NewSocks4(addr, userID string) (*Socks4, error) {
+	return &Socks4{
+		Base: &Base{
+			addr:  addr,
+			proto: proto.Socks4,
+		},
+		userID: userID,
+	}, nil
+}
+
+func (ss *Socks4) DialContext(ctx context.Context, metadata *M.Metadata) (c net.Conn, err error) {
+	c, err = dialer.DialContext(ctx, "tcp", ss.Addr())
+	if err != nil {
+		return nil, fmt.Errorf("connect to %s: %w", ss.Addr(), err)
+	}
+	setKeepAlive(c)
+
+	defer safeConnClose(c, err)
+
+	err = socks4.ClientHandshake(c, metadata.DestinationAddress(), socks4.CmdConnect, ss.userID)
+	return
+}

proxy/socks5.go

@@ -2,14 +2,15 @@ package proxy
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"net"
 
 	"github.com/xjasonlyu/tun2socks/component/dialer"
-	"github.com/xjasonlyu/tun2socks/component/socks5"
 	M "github.com/xjasonlyu/tun2socks/constant"
 	"github.com/xjasonlyu/tun2socks/proxy/proto"
+	"github.com/xjasonlyu/tun2socks/transport/socks5"
 )
 
 var _ Proxy = (*Socks5)(nil)
@@ -19,6 +20,9 @@ type Socks5 struct {
 
 	user string
 	pass string
+
+	// unix indicates if socks5 over UDS is enabled.
+	unix bool
 }
 
 func NewSocks5(addr, user, pass string) (*Socks5, error) {
@@ -29,21 +33,23 @@ func NewSocks5(addr, user, pass string) (*Socks5, error) {
 		},
 		user: user,
 		pass: pass,
+		unix: len(addr) > 0 && addr[0] == '/',
 	}, nil
 }
 
 func (ss *Socks5) DialContext(ctx context.Context, metadata *M.Metadata) (c net.Conn, err error) {
-	c, err = dialer.DialContext(ctx, "tcp", ss.Addr())
+	var network = "tcp"
+	if ss.unix {
+		network = "unix"
+	}
+
+	c, err = dialer.DialContext(ctx, network, ss.Addr())
 	if err != nil {
 		return nil, fmt.Errorf("connect to %s: %w", ss.Addr(), err)
 	}
 	setKeepAlive(c)
 
-	defer func() {
-		if err != nil && c != nil {
-			c.Close()
-		}
-	}()
+	defer safeConnClose(c, err)
 
 	var user *socks5.User
 	if ss.user != "" {
@@ -58,6 +64,10 @@ func (ss *Socks5) DialContext(ctx context.Context, metadata *M.Metadata) (c net.
 }
 
 func (ss *Socks5) DialUDP(*M.Metadata) (_ net.PacketConn, err error) {
+	if ss.unix {
+		return nil, errors.New("not supported when unix domain socket is enabled")
+	}
+
 	ctx, cancel := context.WithTimeout(context.Background(), tcpConnectTimeout)
 	defer cancel()
 
@@ -94,7 +104,7 @@ func (ss *Socks5) DialUDP(*M.Metadata) (_ net.PacketConn, err error) {
 
 	addr, err := socks5.ClientHandshake(c, targetAddr, socks5.CmdUDPAssociate, user)
 	if err != nil {
-		return nil, fmt.Errorf("client hanshake: %w", err)
+		return nil, fmt.Errorf("client handshake: %w", err)
 	}
 
 	pc, err := dialer.ListenPacket("udp", "")

proxy/util.go

@@ -16,3 +16,10 @@ func setKeepAlive(c net.Conn) {
 		tcp.SetKeepAlivePeriod(tcpKeepAlivePeriod)
 	}
 }
+
+// safeConnClose closes tcp connection safely.
+func safeConnClose(c net.Conn, err error) {
+	if c != nil && err != nil {
+		c.Close()
+	}
+}

transport/socks4/socks4.go

@@ -0,0 +1,127 @@
+// Package socks4 provides SOCKS4/SOCKS4A client functionalities.
+package socks4
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+	"strconv"
+)
+
+const Version = 0x04
+
+type Command = uint8
+
+const (
+	CmdConnect Command = 0x01
+	CmdBind    Command = 0x02
+)
+
+type Code = uint8
+
+const (
+	RequestGranted          Code = 90
+	RequestRejected         Code = 91
+	RequestIdentdFailed     Code = 92
+	RequestIdentdMismatched Code = 93
+)
+
+var (
+	errVersionMismatched = errors.New("version code mismatched")
+	errIPv6NotSupported  = errors.New("IPv6 not supported")
+
+	ErrRequestRejected         = errors.New("request rejected or failed")
+	ErrRequestIdentdFailed     = errors.New("request rejected because SOCKS server cannot connect to identd on the client")
+	ErrRequestIdentdMismatched = errors.New("request rejected because the client program and identd report different user-ids")
+	ErrRequestUnknownCode      = errors.New("request failed with unknown code")
+)
+
+func ClientHandshake(rw io.ReadWriter, addr string, command Command, userID string) (err error) {
+	var (
+		host string
+		port uint16
+	)
+	if host, port, err = splitHostPort(addr); err != nil {
+		return err
+	}
+
+	ip := net.ParseIP(host)
+	if ip == nil /* HOST */ {
+		ip = net.IPv4(0, 0, 0, 1)
+	} else if ip.To4() == nil /* IPv6 */ {
+		return errIPv6NotSupported
+	}
+
+	dstIP := /* [4]byte */ ip.To4()
+
+	req := &bytes.Buffer{}
+	req.WriteByte(Version)
+	req.WriteByte(command)
+	binary.Write(req, binary.BigEndian, port)
+	req.Write(dstIP)
+	req.WriteString(userID)
+	req.WriteByte(0) /* NULL */
+
+	if isReservedIP(dstIP) /* SOCKS4A */ {
+		req.WriteString(host)
+		req.WriteByte(0) /* NULL */
+	}
+
+	if _, err = rw.Write(req.Bytes()); err != nil {
+		return err
+	}
+
+	var resp [8]byte
+	if _, err = io.ReadFull(rw, resp[:]); err != nil {
+		return err
+	}
+
+	if resp[0] != 0x00 {
+		return errVersionMismatched
+	}
+
+	switch resp[1] {
+	case RequestGranted:
+		return nil
+	case RequestRejected:
+		return ErrRequestRejected
+	case RequestIdentdFailed:
+		return ErrRequestIdentdFailed
+	case RequestIdentdMismatched:
+		return ErrRequestIdentdMismatched
+	default:
+		return ErrRequestUnknownCode
+	}
+}
+
+// For version 4A, if the client cannot resolve the destination host's
+// domain name to find its IP address, it should set the first three bytes
+// of DSTIP to NULL and the last byte to a non-zero value. (This corresponds
+// to IP address 0.0.0.x, with x nonzero. As decreed by IANA  -- The
+// Internet Assigned Numbers Authority -- such an address is inadmissible
+// as a destination IP address and thus should never occur if the client
+// can resolve the domain name.)
+func isReservedIP(ip net.IP) bool {
+	subnet := net.IPNet{
+		IP:   net.IPv4zero,
+		Mask: net.IPv4Mask(0xff, 0xff, 0xff, 0x00),
+	}
+
+	return !ip.IsUnspecified() && subnet.Contains(ip)
+}
+
+func splitHostPort(addr string) (string, uint16, error) {
+	host, portStr, err := net.SplitHostPort(addr)
+	if err != nil {
+		return "", 0, err
+	}
+
+	portInt, err := strconv.ParseUint(portStr, 10, 16)
+	if err != nil {
+		return "", 0, err
+	}
+
+	return host, uint16(portInt), nil
+}

transport/socks4/socks4.txt

@@ -0,0 +1,152 @@
+	SOCKS: A protocol for TCP proxy across firewalls
+
+			Ying-Da Lee
+		Principal Member Technical Staff
+		  NEC Systems Laboratory, CSTC
+			ylee@syl.dl.nec.com
+
+SOCKS was originally developed by David Koblas and subsequently modified
+and extended by me to its current running version -- version 4. It is a
+protocol that relays TCP sessions at a firewall host to allow application
+users transparent access across the firewall. Because the protocol is
+independent of application protocols, it can be (and has been) used for
+many different services, such as telnet, ftp, finger, whois, gopher, WWW,
+etc. Access control can be applied at the beginning of each TCP session;
+thereafter the server simply relays the data between the client and the
+application server, incurring minimum processing overhead. Since SOCKS
+never has to know anything about the application protocol, it should also
+be easy for it to accommodate applications which use encryption to protect
+their traffic from nosey snoopers.
+
+Two operations are defined: CONNECT and BIND.
+
+1) CONNECT
+
+The client connects to the SOCKS server and sends a CONNECT request when
+it wants to establish a connection to an application server. The client
+includes in the request packet the IP address and the port number of the
+destination host, and userid, in the following format.
+
+		+----+----+----+----+----+----+----+----+----+----+....+----+
+		| VN | CD | DSTPORT |      DSTIP        | USERID       |NULL|
+		+----+----+----+----+----+----+----+----+----+----+....+----+
+ # of bytes:	   1    1      2              4           variable       1
+
+VN is the SOCKS protocol version number and should be 4. CD is the
+SOCKS command code and should be 1 for CONNECT request. NULL is a byte
+of all zero bits.
+
+The SOCKS server checks to see whether such a request should be granted
+based on any combination of source IP address, destination IP address,
+destination port number, the userid, and information it may obtain by
+consulting IDENT, cf. RFC 1413.  If the request is granted, the SOCKS
+server makes a connection to the specified port of the destination host.
+A reply packet is sent to the client when this connection is established,
+or when the request is rejected or the operation fails. 
+
+		+----+----+----+----+----+----+----+----+
+		| VN | CD | DSTPORT |      DSTIP        |
+		+----+----+----+----+----+----+----+----+
+ # of bytes:	   1    1      2              4
+
+VN is the version of the reply code and should be 0. CD is the result
+code with one of the following values:
+
+	90: request granted
+	91: request rejected or failed
+	92: request rejected becasue SOCKS server cannot connect to
+	    identd on the client
+	93: request rejected because the client program and identd
+	    report different user-ids
+
+The remaining fields are ignored.
+
+The SOCKS server closes its connection immediately after notifying
+the client of a failed or rejected request. For a successful request,
+the SOCKS server gets ready to relay traffic on both directions. This
+enables the client to do I/O on its connection as if it were directly
+connected to the application server.
+
+
+2) BIND
+
+The client connects to the SOCKS server and sends a BIND request when
+it wants to prepare for an inbound connection from an application server.
+This should only happen after a primary connection to the application
+server has been established with a CONNECT.  Typically, this is part of
+the sequence of actions:
+
+-bind(): obtain a socket
+-getsockname(): get the IP address and port number of the socket
+-listen(): ready to accept call from the application server
+-use the primary connection to inform the application server of
+ the IP address and the port number that it should connect to.
+-accept(): accept a connection from the application server
+
+The purpose of SOCKS BIND operation is to support such a sequence
+but using a socket on the SOCKS server rather than on the client.
+
+The client includes in the request packet the IP address of the
+application server, the destination port used in the primary connection,
+and the userid.
+
+		+----+----+----+----+----+----+----+----+----+----+....+----+
+		| VN | CD | DSTPORT |      DSTIP        | USERID       |NULL|
+		+----+----+----+----+----+----+----+----+----+----+....+----+
+ # of bytes:	   1    1      2              4           variable       1
+
+VN is again 4 for the SOCKS protocol version number. CD must be 2 to
+indicate BIND request.
+
+The SOCKS server uses the client information to decide whether the
+request is to be granted. The reply it sends back to the client has
+the same format as the reply for CONNECT request, i.e.,
+
+		+----+----+----+----+----+----+----+----+
+		| VN | CD | DSTPORT |      DSTIP        |
+		+----+----+----+----+----+----+----+----+
+ # of bytes:	   1    1      2              4
+
+VN is the version of the reply code and should be 0. CD is the result
+code with one of the following values:
+
+	90: request granted
+	91: request rejected or failed
+	92: request rejected becasue SOCKS server cannot connect to
+	    identd on the client
+	93: request rejected because the client program and identd
+	    report different user-ids.
+
+However, for a granted request (CD is 90), the DSTPORT and DSTIP fields
+are meaningful.  In that case, the SOCKS server obtains a socket to wait
+for an incoming connection and sends the port number and the IP address
+of that socket to the client in DSTPORT and DSTIP, respectively. If the
+DSTIP in the reply is 0 (the value of constant INADDR_ANY), then the
+client should replace it by the IP address of the SOCKS server to which
+the cleint is connected. (This happens if the SOCKS server is not a
+multi-homed host.)  In the typical scenario, these two numbers are
+made available to the application client prgram via the result of the
+subsequent getsockname() call.  The application protocol must provide a
+way for these two pieces of information to be sent from the client to
+the application server so that it can initiate the connection, which
+connects it to the SOCKS server rather than directly to the application
+client as it normally would.
+
+The SOCKS server sends a second reply packet to the client when the
+anticipated connection from the application server is established.
+The SOCKS server checks the IP address of the originating host against
+the value of DSTIP specified in the client's BIND request.  If a mismatch
+is found, the CD field in the second reply is set to 91 and the SOCKS
+server closes both connections.  If the two match, CD in the second
+reply is set to 90 and the SOCKS server gets ready to relay the traffic
+on its two connections. From then on the client does I/O on its connection
+to the SOCKS server as if it were directly connected to the application
+server.
+
+
+
+For both CONNECT and BIND operations, the server sets a time limit
+(2 minutes in current CSTC implementation) for the establishment of its
+connection with the application server. If the connection is still not
+establiched when the time limit expires, the server closes its connection
+to the client and gives up.

transport/socks4/socks4a.txt

@@ -0,0 +1,39 @@
+	SOCKS 4A: A  Simple Extension to SOCKS 4 Protocol
+
+			Ying-Da Lee
+		yingda@best.com  or  yingda@esd.sgi.com
+
+Please read SOCKS4.protocol first for an description of the version 4
+protocol. This extension is intended to allow the use of SOCKS on hosts
+which are not capable of resolving all domain names.
+
+In version 4, the client sends the following packet to the SOCKS server
+to request a CONNECT or a BIND operation:
+
+		+----+----+----+----+----+----+----+----+----+----+....+----+
+		| VN | CD | DSTPORT |      DSTIP        | USERID       |NULL|
+		+----+----+----+----+----+----+----+----+----+----+....+----+
+ # of bytes:	   1    1      2              4           variable       1
+
+VN is the SOCKS protocol version number and should be 4. CD is the
+SOCKS command code and should be 1 for CONNECT or 2 for BIND. NULL
+is a byte of all zero bits.
+
+For version 4A, if the client cannot resolve the destination host's
+domain name to find its IP address, it should set the first three bytes
+of DSTIP to NULL and the last byte to a non-zero value. (This corresponds
+to IP address 0.0.0.x, with x nonzero. As decreed by IANA  -- The
+Internet Assigned Numbers Authority -- such an address is inadmissible
+as a destination IP address and thus should never occur if the client
+can resolve the domain name.) Following the NULL byte terminating
+USERID, the client must sends the destination domain name and termiantes
+it with another NULL byte. This is used for both CONNECT and BIND requests.
+
+A server using protocol 4A must check the DSTIP in the request packet.
+If it represent address 0.0.0.x with nonzero x, the server must read
+in the domain name that the client sends in the packet. The server
+should resolve the domain name and make connection to the destination
+host if it can. 
+
+SOCKSified sockd may pass domain names that it cannot resolve to
+the next-hop SOCKS server.

transport/socks5/socks5.go

@@ -148,15 +148,16 @@ type User struct {
 // ClientHandshake fast-tracks SOCKS initialization to get target address to connect on client side.
 func ClientHandshake(rw io.ReadWriter, addr Addr, command Command, user *User) (Addr, error) {
 	buf := make([]byte, MaxAddrLen)
-	var err error
+
+	var method uint8
+	if user != nil {
+		method = 0x02 /* USERNAME/PASSWORD */
+	} else {
+		method = 0x00 /* NO AUTHENTICATION REQUIRED */
+	}
 
 	// VER, NMETHODS, METHODS
-	if user != nil {
-		_, err = rw.Write([]byte{Version, 0x01 /* NMETHODS */, 0x02 /* USERNAME/PASSWORD */})
-	} else {
-		_, err = rw.Write([]byte{Version, 0x01 /* NMETHODS */, 0x00 /* NO AUTHENTICATION REQUIRED */})
-	}
-	if err != nil {
+	if _, err := rw.Write([]byte{Version, 0x01 /* NMETHODS */, method}); err != nil {
 		return nil, err
 	}
 
@@ -213,7 +214,7 @@ func ClientHandshake(rw io.ReadWriter, addr Addr, command Command, user *User) (
 	}
 
 	if rep := Reply(buf[1]); rep != 0x00 /* SUCCEEDED */ {
-		return nil, fmt.Errorf("%#X: %s", rep, rep.String())
+		return nil, fmt.Errorf("%#02x: %s", uint8(rep), rep)
 	}
 
 	return ReadAddr(rw, buf)

tunnel/tcp.go

@@ -3,7 +3,6 @@ package tunnel
 import (
 	"io"
 	"net"
-	"strconv"
 	"sync"
 	"time"
 
@@ -45,10 +44,7 @@ func handleTCP(localConn core.TCPConn) {
 		metadata.MidIP = dialerAddr.IP
 		metadata.MidPort = uint16(dialerAddr.Port)
 	} else { /* fallback */
-		ip, p, _ := net.SplitHostPort(targetConn.LocalAddr().String())
-		port, _ := strconv.ParseUint(p, 10, 16)
-		metadata.MidIP = net.ParseIP(ip)
-		metadata.MidPort = uint16(port)
+		metadata.MidIP, metadata.MidPort = parseAddr(targetConn.LocalAddr().String())
 	}
 
 	targetConn = newTCPTracker(targetConn, metadata)

tunnel/tunnel.go

@@ -39,13 +39,6 @@ func AddPacket(packet core.UDPPacket) {
 	}
 }
 
-func max(a, b int) int {
-	if a > b {
-		return a
-	}
-	return b
-}
-
 func process() {
 	for i := 0; i < _numUDPWorkers; i++ {
 		queue := _udpQueue

tunnel/udp.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"net"
 	"os"
-	"strconv"
 	"time"
 
 	"github.com/xjasonlyu/tun2socks/common/pool"
@@ -88,10 +87,7 @@ func handleUDP(packet core.UDPPacket) {
 			metadata.MidIP = dialerAddr.IP
 			metadata.MidPort = uint16(dialerAddr.Port)
 		} else { /* fallback */
-			ip, p, _ := net.SplitHostPort(pc.LocalAddr().String())
-			port, _ := strconv.ParseUint(p, 10, 16)
-			metadata.MidIP = net.ParseIP(ip)
-			metadata.MidPort = uint16(port)
+			metadata.MidIP, metadata.MidPort = parseAddr(pc.LocalAddr().String())
 		}
 
 		pc = newUDPTracker(pc, metadata)

tunnel/util.go

@@ -0,0 +1,20 @@
+package tunnel
+
+import (
+	"net"
+	"strconv"
+)
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+// parseAddr parses address to IP and port.
+func parseAddr(addr string) (net.IP, uint16) {
+	host, portStr, _ := net.SplitHostPort(addr)
+	portInt, _ := strconv.ParseUint(portStr, 10, 16)
+	return net.ParseIP(host), uint16(portInt)
+}