Fix(fd): compile error

$ go mod tidy -compat=1.17

.dockerignore

@@ -0,0 +1,6 @@
+.github
+.gitignore
+
+# Other
+build/*
+docs/*

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,33 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Environment**
+ - OS: [e.g. `Ubuntu-20.04`]
+ - Version: [e.g. `v2.1.0`]
+ - Network: [e.g. route tables, iptables rules]
+
+**Log**
+Paste the tun2socks log below with the log level set to `DEBUG`.
+```
+```
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. [First Step]
+2. [Second Step]
+3. ……
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem?**
+A clear and concise description of what the problem is.
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/docker.yml

@@ -0,0 +1,75 @@
+name: Publish Docker Image
+
+on:
+  push:
+    branches:
+      - 'main'
+    tags:
+      - '*'
+    paths-ignore:
+      - '**.md'
+      - 'docs/**'
+
+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: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: latest
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: xjasonlyu
+          password: ${{ secrets.CR_PAT }}
+
+      - name: Get Version
+        id: shell
+        run: |
+          echo ::set-output name=version::$(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:nightly
+            ghcr.io/xjasonlyu/tun2socks:nightly
+
+      - name: Build and Push (latest)
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          tags: |
+            xjasonlyu/tun2socks:latest
+            xjasonlyu/tun2socks:${{ steps.shell.outputs.version }}
+            ghcr.io/xjasonlyu/tun2socks:latest
+            ghcr.io/xjasonlyu/tun2socks:${{ steps.shell.outputs.version }}

.github/workflows/go.yml

@@ -1,25 +1,30 @@
-name: Go
+name: Go Static Check
 
 on:
   push:
     branches:
-      - master
-    tags:
       - '*'
+    tags-ignore:
+      - '*'
+    paths-ignore:
+      - '**.md'
+      - 'docs/**'
+  pull_request:
 
 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: 1.15.x
-
-      - name: Check out code into the Go module directory
-        uses: actions/checkout@v2
+          go-version: 1.17.x
 
       - name: Cache go module
         uses: actions/cache@v2
@@ -33,22 +38,5 @@ jobs:
         run: |
           go test ./...
           go vet ./...
-          go get -u honnef.co/go/tools/cmd/staticcheck
+          go install honnef.co/go/tools/cmd/staticcheck@latest
           staticcheck -- $(go list ./...)
-
-      - name: Build
-        if: startsWith(github.ref, 'refs/tags/')
-        env:
-          DIR: bin
-          NAME: tun2socks
-        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: bin/*
-          draft: true
-          prerelease: true

.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

.github/workflows/stale.yml

@@ -0,0 +1,16 @@
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+    - cron: "0 10 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-issue-message: 'This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days'
+          days-before-stale: 60
+          days-before-close: 7

.gitignore

@@ -1,6 +1,14 @@
+# Binaries
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+build/
 
+# IDE
 .idea/
 .vscode/
-bin/
 
+# Misc
 .DS_Store

Dockerfile

@@ -1,32 +1,31 @@
 FROM golang:alpine AS builder
 
-WORKDIR /app
-COPY . /app
+WORKDIR /tun2socks-src
+COPY . /tun2socks-src
 
 RUN apk add --no-cache make git \
-    && go mod download \
-    && make docker \
-    && /app/bin/tun2socks-docker -v
+    && make tun2socks \
+    && mv ./build/tun2socks /tun2socks
 
 FROM alpine:latest
+LABEL org.opencontainers.image.source="https://github.com/xjasonlyu/tun2socks"
 
-COPY ./scripts/entrypoint.sh /entrypoint.sh
-COPY --from=builder /app/bin/tun2socks-docker /usr/bin/tun2socks
+COPY docker/entrypoint.sh /entrypoint.sh
+COPY --from=builder /tun2socks /usr/bin/tun2socks
 
 RUN apk add --update --no-cache iptables iproute2 \
     && chmod +x /entrypoint.sh
 
-ENV TUN tun0
-ENV ETH eth0
-ENV TUN_ADDR=
-ENV TUN_MASK=
-ENV LOGLEVEL=
-ENV EXCLUDED=
-ENV EXTRACMD=
-
-ENV API=
-ENV DNS=
-ENV HOSTS=
-ENV PROXY=
+ENV TUN=tun0
+ENV ADDR=198.18.0.1/15
+ENV LOGLEVEL=info
+ENV PROXY=direct://
+ENV MTU=9000
+ENV STATS=
+ENV TOKEN=
+ENV UDP_TIMEOUT=
+ENV EXTRA_COMMANDS=
+ENV TUN_INCLUDED_ROUTES=
+ENV TUN_EXCLUDED_ROUTES=
 
 ENTRYPOINT ["/entrypoint.sh"]

LICENSE

@@ -1,21 +1,674 @@
-MIT License
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
 
-Copyright (c) 2020 Jason Lyu
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+                            Preamble
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+  13. Use with the GNU Affero General Public License.
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+
+                     END OF TERMS AND CONDITIONS
+
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+
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+possible use to the public, the best way to achieve this is to make it
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+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
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+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
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+<https://www.gnu.org/licenses/>.
+
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+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
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+<https://www.gnu.org/licenses/why-not-lgpl.html>.

Makefile

@@ -1,44 +1,151 @@
-DIR = "bin"
-NAME = "tun2socks"
+BINARY := tun2socks
+MODULE := github.com/xjasonlyu/tun2socks
 
-TAGS = ""
-BUILD_FLAGS = "-v"
+BUILD_DIR     := build
+BUILD_TAGS    :=
+BUILD_FLAGS   := -v
+BUILD_COMMIT  := $(shell git rev-parse --short HEAD)
+BUILD_VERSION := $(shell git describe --abbrev=0 --tags HEAD)
 
-VERSION = $(shell git describe --tags)
-BUILD_TIME = $(shell date -u '+%FT%TZ')
+CGO_ENABLED := 0
+GO111MODULE := on
 
 LDFLAGS += -w -s -buildid=
-LDFLAGS += -X "main.Version=$(VERSION)"
-LDFLAGS += -X "main.BuildTime=$(BUILD_TIME)"  # RFC3339
-GO_BUILD = CGO_ENABLED=0 go build $(BUILD_FLAGS) -ldflags '$(LDFLAGS)' -tags '$(TAGS)' -trimpath
+LDFLAGS += -X "$(MODULE)/constant.Version=$(BUILD_VERSION)"
+LDFLAGS += -X "$(MODULE)/constant.GitCommit=$(BUILD_COMMIT)"
 
-PLATFORM_LIST = \
+GO_BUILD = GO111MODULE=$(GO111MODULE) CGO_ENABLED=$(CGO_ENABLED) \
+	go build $(BUILD_FLAGS) -ldflags '$(LDFLAGS)' -tags '$(BUILD_TAGS)' -trimpath
+
+UNIX_ARCH_LIST = \
 	darwin-amd64 \
+	darwin-arm64 \
+	freebsd-386 \
+	freebsd-amd64 \
+	freebsd-arm64 \
+	linux-386 \
 	linux-amd64 \
 	linux-arm64 \
+	linux-armv5 \
+	linux-armv6 \
+	linux-armv7 \
+	linux-mips-softfloat \
+	linux-mips-hardfloat \
+	linux-mipsle-softfloat \
+	linux-mipsle-hardfloat \
+	linux-mips64 \
+	linux-mips64le \
+	linux-ppc64 \
+	linux-ppc64le \
+	linux-s390x \
+	openbsd-386 \
+	openbsd-amd64 \
+	openbsd-arm64
 
-.PHONY: $(PLATFORM_LIST)
+WINDOWS_ARCH_LIST = \
+	windows-386 \
+	windows-amd64 \
+	windows-arm64 \
+	windows-arm32v7
 
-all: $(PLATFORM_LIST)
+all: linux-amd64 darwin-amd64 windows-amd64
 
-docker:
-	$(GO_BUILD) -o $(DIR)/$(NAME)-$@
+tun2socks:
+	$(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)
 
 darwin-amd64:
-	GOARCH=amd64 GOOS=darwin $(GO_BUILD) -o $(DIR)/$(NAME)-$@
+	GOARCH=amd64 GOOS=darwin $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+darwin-arm64:
+	GOARCH=arm64 GOOS=darwin $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+freebsd-386:
+	GOARCH=386 GOOS=freebsd $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+freebsd-amd64:
+	GOARCH=amd64 GOOS=freebsd $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+freebsd-arm64:
+	GOARCH=arm64 GOOS=freebsd $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-386:
+	GOARCH=386 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
 
 linux-amd64:
-	GOARCH=amd64 GOOS=linux $(GO_BUILD) -o $(DIR)/$(NAME)-$@
+	GOARCH=amd64 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
 
 linux-arm64:
-	GOARCH=arm64 GOOS=linux $(GO_BUILD) -o $(DIR)/$(NAME)-$@
+	GOARCH=arm64 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
 
-zip_releases=$(addsuffix .zip, $(PLATFORM_LIST))
+linux-armv5:
+	GOARCH=arm GOARM=5 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
 
-$(zip_releases): %.zip : %
-	zip -m -j $(DIR)/$(NAME)-$(basename $@).zip $(DIR)/$(NAME)-$(basename $@)
+linux-armv6:
+	GOARCH=arm GOARM=6 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
 
-releases: $(zip_releases)
+linux-armv7:
+	GOARCH=arm GOARM=7 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-mips-softfloat:
+	GOARCH=mips GOMIPS=softfloat GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-mips-hardfloat:
+	GOARCH=mips GOMIPS=hardfloat GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-mipsle-softfloat:
+	GOARCH=mipsle GOMIPS=softfloat GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-mipsle-hardfloat:
+	GOARCH=mipsle GOMIPS=hardfloat GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-mips64:
+	GOARCH=mips64 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-mips64le:
+	GOARCH=mips64le GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-ppc64:
+	GOARCH=ppc64 GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-ppc64le:
+	GOARCH=ppc64le GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+linux-s390x:
+	GOARCH=s390x GOOS=linux $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+openbsd-386:
+	GOARCH=386 GOOS=openbsd $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+openbsd-amd64:
+	GOARCH=amd64 GOOS=openbsd $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+openbsd-arm64:
+	GOARCH=arm64 GOOS=openbsd $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@
+
+windows-386:
+	GOARCH=386 GOOS=windows $(GO_BUILD) -o $(BUILD_DIR)/$(BINARY)-$@.exe
+
+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
+
+unix_releases := $(addsuffix .zip, $(UNIX_ARCH_LIST))
+windows_releases := $(addsuffix .zip, $(WINDOWS_ARCH_LIST))
+
+$(unix_releases): %.zip: %
+	@zip -qmj $(BUILD_DIR)/$(BINARY)-$(basename $@).zip $(BUILD_DIR)/$(BINARY)-$(basename $@)
+
+$(windows_releases): %.zip: %
+	@zip -qmj $(BUILD_DIR)/$(BINARY)-$(basename $@).zip $(BUILD_DIR)/$(BINARY)-$(basename $@).exe
+
+all-arch: $(UNIX_ARCH_LIST) $(WINDOWS_ARCH_LIST)
+
+releases: $(unix_releases) $(windows_releases)
 
 clean:
-	rm $(DIR)/*
+	rm -rf $(BUILD_DIR)

README.md

@@ -1,74 +1,63 @@
-# tun2socks
+![tun2socks](docs/logo.png)
 
-![build](https://img.shields.io/github/workflow/status/xjasonlyu/tun2socks/Go?style=flat-square)
-![go report](https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks?style=flat-square)
-![license](https://img.shields.io/github/license/xjasonlyu/tun2socks?style=flat-square)
-![release](https://img.shields.io/github/v/release/xjasonlyu/tun2socks.svg?include_prereleases&style=flat-square)
+[![GitHub Workflow][1]](https://github.com/xjasonlyu/tun2socks/actions)
+[![Go Version][2]](https://github.com/xjasonlyu/tun2socks/blob/main/go.mod)
+[![Go Report][3]](https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks)
+[![GitHub License][4]](https://github.com/xjasonlyu/tun2socks/blob/main/LICENSE)
+[![Releases][5]](https://github.com/xjasonlyu/tun2socks/releases)
 
-A tun2socks implementation written in Go.
+[1]: https://img.shields.io/github/workflow/status/xjasonlyu/tun2socks/Go?style=flat-square
+[2]: https://img.shields.io/github/go-mod/go-version/xjasonlyu/tun2socks/main?style=flat-square
+[3]: https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks?style=flat-square
+[4]: https://img.shields.io/github/license/xjasonlyu/tun2socks?style=flat-square
+[5]: https://img.shields.io/github/v/release/xjasonlyu/tun2socks?include_prereleases&style=flat-square
+
+English | [简体中文](README_ZH.md)
 
 ## Features
 
-- External RESTful API support
-- Fake DNS with manual hosts support
-- IPv4/IPv6 support
-- Optimized UDP transmission for game acceleration
-- Pure Go implementation, no CGO required
-- Socks5, Shadowsocks protocol support for remote connections
-- TCP/IP stack powered by [gVisor](https://github.com/google/gvisor)
-- Up to 2.5Gbps throughput (10x faster than [v1](https://github.com/xjasonlyu/tun2socks/tree/v1))
+- **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)**
 
-### Requirements
+## Documentation
 
-| Target | Minimum | Recommended |
-| --- | --- | --- |
-| System | linux darwin | linux |
-| Memory | >20MB | +∞ |
-| CPU | ANY | amd64 arm64 |
+Docs and quick start guides can be found at [Github Wiki](https://github.com/xjasonlyu/tun2socks/wiki).
 
-## QuickStart
+## Community
 
-Download from precompiled [Releases](https://github.com/xjasonlyu/tun2socks/releases).
-
-create tun
-
-```shell script
-ip tuntap add mode tun dev tun0
-ip addr add 198.18.0.1/15 dev tun0
-ip link set dev tun0 up
-```
-
-run
-
-```shell script
-./tun2socks --loglevel WARN --device tun://tun0 --proxy socks5://server:port --interface eth0
-```
-
-or just
-
-```shell script
-PROXY=socks5://server:port LOGLEVEL=WARN sh ./scripts/entrypoint.sh
-```
-
-## Build from source
-
-```text
-$ git clone https://github.com/xjasonlyu/tun2socks.git
-$ cd tun2socks
-$ make
-```
-
-## Issues
-
-Due to the implementation of pure Go, the memory usage is higher than the previous version.
-If you are memory sensitive, please go back to [v1](https://github.com/xjasonlyu/tun2socks/tree/v1).
-
-## TODO
-
-- [ ] Windows support
+Welcome and feel free to ask any questions at [Github Discussions](https://github.com/xjasonlyu/tun2socks/discussions).
 
 ## Credits
 
-- [Dreamacro/clash](https://github.com/Dreamacro/clash)
-- [google/gvisor](https://github.com/google/gvisor)
-- [majek/slirpnetstack](https://github.com/majek/slirpnetstack)
+- [Dreamacro/clash](https://github.com/Dreamacro/clash) - A rule-based tunnel in Go
+- [google/gvisor](https://github.com/google/gvisor) - Application Kernel for Containers
+- [wireguard-go](https://git.zx2c4.com/wireguard-go) - Go Implementation of WireGuard
+
+## License
+
+[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

@@ -0,0 +1,68 @@
+![tun2socks](docs/logo.png)
+
+[![GitHub Workflow][1]](https://github.com/xjasonlyu/tun2socks/actions)
+[![Go Version][2]](https://github.com/xjasonlyu/tun2socks/blob/main/go.mod)
+[![Go Report][3]](https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks)
+[![GitHub License][4]](https://github.com/xjasonlyu/tun2socks/blob/main/LICENSE)
+[![Releases][5]](https://github.com/xjasonlyu/tun2socks/releases)
+
+[1]: https://img.shields.io/github/workflow/status/xjasonlyu/tun2socks/Go?style=flat-square
+[2]: https://img.shields.io/github/go-mod/go-version/xjasonlyu/tun2socks/main?style=flat-square
+[3]: https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks?style=flat-square
+[4]: https://img.shields.io/github/license/xjasonlyu/tun2socks?style=flat-square
+[5]: https://img.shields.io/github/v/release/xjasonlyu/tun2socks?include_prereleases&style=flat-square
+
+[English](README.md) | 简体中文
+
+## 为什么使用 tun2socks ？
+
+通过在主机上运行`tun2socks`，可以轻松地接管所有的`TCP/UDP`流量，同时提供诸多专业的功能特性，这包括：
+
+- 强制使不支持代理的程序走代理
+- 配合Clash、V2Ray等工具实现全局代理上网
+- 配合Burp、Charles等工具进行应用层数据的调试
+- 配合DHCP、CoreDNS等工具部署路由模式代理局域网流量
+
+## 特性介绍
+
+- **全面支持：** IPv4/IPv6/ICMP/TCP/UDP
+- **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
+- **TCP/IP栈：** 由 **[gVisor](https://github.com/google/gvisor)** 强力驱动 
+- **高性能：** >2.5Gbps 的带宽吞吐量
+
+## 硬件需求
+
+| 目标 | 最小 | 建议 |
+| :--- | :---: | :---: |
+| 系统 | Linux MacOS Freebsd OpenBSD Windows | Linux or MacOS |
+| 内存 | >20MB | >128MB |
+| 架构 | ANY | AMD64 or ARM64 |
+
+## 使用文档
+
+文档以及使用方式，请看 [Github Wiki](https://github.com/xjasonlyu/tun2socks/wiki)。
+
+## 交流讨论
+
+欢迎来讨论区交流提问，[Github Discussions](https://github.com/xjasonlyu/tun2socks/discussions)。
+
+## 注意事项
+
+1. 由于采用了纯Go实现，所以这一版本的`tun2socks`在有大量连接时内存消耗通常较多。如果您的需求对内存消耗极为敏感，请继续使用 [v1](https://github.com/xjasonlyu/tun2socks/tree/v1) 版本。
+2. `tun2socks`只应该专注于将网络层的TCP/UDP流量转发给SOCKS服务器，其他的如DNS（DoH）、DHCP等模块功能应该交由第三方应用实现，所以弃用了DNS模块。
+3. 因为是通过用户空间的网络栈接管所有流量并处理转发，在高吞吐时CPU的使用量会剧增，所以CPU的性能直接与可以达到的最大带宽挂钩。
+
+## 特别感谢
+
+- [Dreamacro/clash](https://github.com/Dreamacro/clash) - A rule-based tunnel in Go
+- [google/gvisor](https://github.com/google/gvisor) - Application Kernel for Containers
+- [wireguard-go](https://git.zx2c4.com/wireguard-go) - Go Implementation of WireGuard
+
+## License
+
+[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)

common/observable/iterable.go

@@ -0,0 +1,3 @@
+package observable
+
+type Iterable <-chan interface{}

common/observable/observable.go

@@ -0,0 +1,67 @@
+package observable
+
+// Ref: github.com/Dreamacro/clash/common/observable
+
+import (
+	"errors"
+	"sync"
+)
+
+type Observable struct {
+	iterable Iterable
+	listener map[Subscription]*Subscriber
+	mux      sync.Mutex
+	done     bool
+}
+
+func (o *Observable) process() {
+	for item := range o.iterable {
+		o.mux.Lock()
+		for _, sub := range o.listener {
+			sub.Emit(item)
+		}
+		o.mux.Unlock()
+	}
+	o.close()
+}
+
+func (o *Observable) close() {
+	o.mux.Lock()
+	defer o.mux.Unlock()
+
+	o.done = true
+	for _, sub := range o.listener {
+		sub.Close()
+	}
+}
+
+func (o *Observable) Subscribe() (Subscription, error) {
+	o.mux.Lock()
+	defer o.mux.Unlock()
+	if o.done {
+		return nil, errors.New("observable is closed")
+	}
+	subscriber := newSubscriber()
+	o.listener[subscriber.Out()] = subscriber
+	return subscriber.Out(), nil
+}
+
+func (o *Observable) UnSubscribe(sub Subscription) {
+	o.mux.Lock()
+	defer o.mux.Unlock()
+	subscriber, exist := o.listener[sub]
+	if !exist {
+		return
+	}
+	delete(o.listener, sub)
+	subscriber.Close()
+}
+
+func NewObservable(any Iterable) *Observable {
+	observable := &Observable{
+		iterable: any,
+		listener: map[Subscription]*Subscriber{},
+	}
+	go observable.process()
+	return observable
+}

common/observable/observable_test.go

@@ -0,0 +1,148 @@
+package observable
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/atomic"
+)
+
+func iterator(item []interface{}) chan interface{} {
+	ch := make(chan interface{})
+	go func() {
+		time.Sleep(100 * time.Millisecond)
+		for _, elm := range item {
+			ch <- elm
+		}
+		close(ch)
+	}()
+	return ch
+}
+
+func TestObservable(t *testing.T) {
+	iter := iterator([]interface{}{1, 2, 3, 4, 5})
+	src := NewObservable(iter)
+	data, err := src.Subscribe()
+	assert.Nil(t, err)
+	count := 0
+	for range data {
+		count++
+	}
+	assert.Equal(t, count, 5)
+}
+
+func TestObservable_MultiSubscribe(t *testing.T) {
+	iter := iterator([]interface{}{1, 2, 3, 4, 5})
+	src := NewObservable(iter)
+	ch1, _ := src.Subscribe()
+	ch2, _ := src.Subscribe()
+	var count = atomic.NewInt32(0)
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	waitCh := func(ch <-chan interface{}) {
+		for range ch {
+			count.Inc()
+		}
+		wg.Done()
+	}
+	go waitCh(ch1)
+	go waitCh(ch2)
+	wg.Wait()
+	assert.Equal(t, int32(10), count.Load())
+}
+
+func TestObservable_UnSubscribe(t *testing.T) {
+	iter := iterator([]interface{}{1, 2, 3, 4, 5})
+	src := NewObservable(iter)
+	data, err := src.Subscribe()
+	assert.Nil(t, err)
+	src.UnSubscribe(data)
+	_, open := <-data
+	assert.False(t, open)
+}
+
+func TestObservable_SubscribeClosedSource(t *testing.T) {
+	iter := iterator([]interface{}{1})
+	src := NewObservable(iter)
+	data, _ := src.Subscribe()
+	<-data
+
+	_, closed := src.Subscribe()
+	assert.NotNil(t, closed)
+}
+
+func TestObservable_UnSubscribeWithNotExistSubscription(t *testing.T) {
+	sub := Subscription(make(chan interface{}))
+	iter := iterator([]interface{}{1})
+	src := NewObservable(iter)
+	src.UnSubscribe(sub)
+}
+
+func TestObservable_SubscribeGoroutineLeak(t *testing.T) {
+	iter := iterator([]interface{}{1, 2, 3, 4, 5})
+	src := NewObservable(iter)
+	max := 100
+
+	var list []Subscription
+	for i := 0; i < max; i++ {
+		ch, _ := src.Subscribe()
+		list = append(list, ch)
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(max)
+	waitCh := func(ch <-chan interface{}) {
+		for range ch {
+		}
+		wg.Done()
+	}
+
+	for _, ch := range list {
+		go waitCh(ch)
+	}
+	wg.Wait()
+
+	for _, sub := range list {
+		_, more := <-sub
+		assert.False(t, more)
+	}
+
+	if len(list) > 0 {
+		_, more := <-list[0]
+		assert.False(t, more)
+	}
+}
+
+func Benchmark_Observable_1000(b *testing.B) {
+	ch := make(chan interface{})
+	o := NewObservable(ch)
+	num := 1000
+
+	var subs []Subscription
+	for i := 0; i < num; i++ {
+		sub, _ := o.Subscribe()
+		subs = append(subs, sub)
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(num)
+
+	b.ResetTimer()
+	for _, sub := range subs {
+		go func(s Subscription) {
+			for range s {
+			}
+			wg.Done()
+		}(sub)
+	}
+
+	for i := 0; i < b.N; i++ {
+		ch <- i
+	}
+
+	close(ch)
+	wg.Wait()
+}

common/observable/subscriber.go

@@ -0,0 +1,33 @@
+package observable
+
+import (
+	"sync"
+)
+
+type Subscription <-chan interface{}
+
+type Subscriber struct {
+	buffer chan interface{}
+	once   sync.Once
+}
+
+func (s *Subscriber) Emit(item interface{}) {
+	s.buffer <- item
+}
+
+func (s *Subscriber) Out() Subscription {
+	return s.buffer
+}
+
+func (s *Subscriber) Close() {
+	s.once.Do(func() {
+		close(s.buffer)
+	})
+}
+
+func newSubscriber() *Subscriber {
+	sub := &Subscriber{
+		buffer: make(chan interface{}, 200),
+	}
+	return sub
+}

common/pool/alloc.go

@@ -0,0 +1,62 @@
+package pool
+
+import (
+	"errors"
+	"math/bits"
+	"sync"
+)
+
+var _allocator = NewAllocator()
+
+// Allocator for incoming frames, optimized to prevent overwriting
+// after zeroing.
+type Allocator struct {
+	buffers []sync.Pool
+}
+
+// NewAllocator initiates a []byte allocator for frames less than
+// 65536 bytes, the waste(memory fragmentation) of space allocation
+// is guaranteed to be no more than 50%.
+func NewAllocator() *Allocator {
+	alloc := &Allocator{}
+	alloc.buffers = make([]sync.Pool, 17) // 1B -> 64K
+	for k := range alloc.buffers {
+		i := k
+		alloc.buffers[k].New = func() interface{} {
+			return make([]byte, 1<<uint32(i))
+		}
+	}
+	return alloc
+}
+
+// Get gets a []byte from pool with most appropriate cap.
+func (alloc *Allocator) Get(size int) []byte {
+	if size <= 0 || size > 65536 {
+		return nil
+	}
+
+	b := msb(size)
+	if size == 1<<b {
+		return alloc.buffers[b].Get().([]byte)[:size]
+	}
+
+	return alloc.buffers[b+1].Get().([]byte)[:size]
+}
+
+// Put returns a []byte to pool for future use,
+// which the cap must be exactly 2^n.
+func (alloc *Allocator) Put(buf []byte) error {
+	b := msb(cap(buf))
+	if cap(buf) == 0 || cap(buf) > 65536 || cap(buf) != 1<<b {
+		return errors.New("allocator Put() incorrect buffer size")
+	}
+
+	//lint:ignore SA6002 ignore temporarily
+	alloc.buffers[b].Put(buf)
+	return nil
+}
+
+// msb returns the pos of most significant bit.
+func msb(size int) uint16 {
+	return uint16(bits.Len32(uint32(size)) - 1)
+}

common/pool/alloc_test.go

@@ -0,0 +1,48 @@
+package pool
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAllocGet(t *testing.T) {
+	alloc := NewAllocator()
+	assert.Nil(t, alloc.Get(0))
+	assert.Equal(t, 1, len(alloc.Get(1)))
+	assert.Equal(t, 2, len(alloc.Get(2)))
+	assert.Equal(t, 3, len(alloc.Get(3)))
+	assert.Equal(t, 4, cap(alloc.Get(3)))
+	assert.Equal(t, 4, cap(alloc.Get(4)))
+	assert.Equal(t, 1023, len(alloc.Get(1023)))
+	assert.Equal(t, 1024, cap(alloc.Get(1023)))
+	assert.Equal(t, 1024, len(alloc.Get(1024)))
+	assert.Equal(t, 65536, len(alloc.Get(65536)))
+	assert.Nil(t, alloc.Get(65537))
+}
+
+func TestAllocPut(t *testing.T) {
+	alloc := NewAllocator()
+	assert.NotNil(t, alloc.Put(nil), "put nil misbehavior")
+	assert.NotNil(t, alloc.Put(make([]byte, 3)), "put elem:3 []bytes misbehavior")
+	assert.Nil(t, alloc.Put(make([]byte, 4)), "put elem:4 []bytes misbehavior")
+	assert.Nil(t, alloc.Put(make([]byte, 1023, 1024)), "put elem:1024 []bytes misbehavior")
+	assert.Nil(t, alloc.Put(make([]byte, 65536)), "put elem:65536 []bytes misbehavior")
+	assert.NotNil(t, alloc.Put(make([]byte, 65537)), "put elem:65537 []bytes misbehavior")
+}
+
+func TestAllocPutThenGet(t *testing.T) {
+	alloc := NewAllocator()
+	data := alloc.Get(4)
+	_ = alloc.Put(data)
+	newData := alloc.Get(4)
+
+	assert.Equal(t, cap(data), cap(newData), "different cap while alloc.Get()")
+}
+
+func BenchmarkMSB(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		msb(rand.Int())
+	}
+}

common/pool/pool.go

@@ -0,0 +1,24 @@
+// Package pool provides a pool of []byte.
+package pool
+
+// Ref: github.com/Dreamacro/clash/common/pool
+
+const (
+	// MaxSegmentSize is the largest possible UDP datagram size.
+	MaxSegmentSize = (1 << 16) - 1
+
+	// io.Copy default buffer size is 32 KiB, but the maximum packet
+	// size of vmess/shadowsocks is about 16 KiB, so define a buffer
+	// of 20 KiB to reduce the memory of each TCP relay.
+	RelayBufferSize = 20 << 10
+)
+
+// Get gets a []byte from default allocator with most appropriate cap.
+func Get(size int) []byte {
+	return _allocator.Get(size)
+}
+
+// Put returns a []byte to default allocator for future use.
+func Put(buf []byte) error {
+	return _allocator.Put(buf)
+}

component/dialer/bind.go

@@ -0,0 +1,21 @@
+package dialer
+
+import (
+	"net"
+	"sync"
+)
+
+var _bindOnce sync.Once
+
+// BindToInterface binds dialer to specific interface.
+func BindToInterface(name string) error {
+	i, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+
+	_bindOnce.Do(func() {
+		addControl(bindToInterface(i))
+	})
+	return nil
+}

component/dialer/bind_darwin.go

@@ -0,0 +1,26 @@
+package dialer
+
+import (
+	"net"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func bindToInterface(i *net.Interface) controlFunc {
+	return func(network, address string, c syscall.RawConn) error {
+		ipStr, _, _ := net.SplitHostPort(address)
+		if ip := net.ParseIP(ipStr); ip != nil && !ip.IsGlobalUnicast() {
+			return nil
+		}
+
+		return c.Control(func(fd uintptr) {
+			switch network {
+			case "tcp4", "udp4":
+				unix.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, i.Index)
+			case "tcp6", "udp6":
+				unix.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IPV6_BOUND_IF, i.Index)
+			}
+		})
+	}
+}

component/dialer/bind_linux.go

@@ -0,0 +1,21 @@
+package dialer
+
+import (
+	"net"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func bindToInterface(i *net.Interface) controlFunc {
+	return func(network, address string, c syscall.RawConn) error {
+		ipStr, _, _ := net.SplitHostPort(address)
+		if ip := net.ParseIP(ipStr); ip != nil && !ip.IsGlobalUnicast() {
+			return nil
+		}
+
+		return c.Control(func(fd uintptr) {
+			unix.BindToDevice(int(fd), i.Name)
+		})
+	}
+}

component/dialer/bind_others.go

@@ -0,0 +1,15 @@
+//go:build !linux && !darwin
+
+package dialer
+
+import (
+	"errors"
+	"net"
+	"syscall"
+)
+
+func bindToInterface(_ *net.Interface) controlFunc {
+	return func(string, string, syscall.RawConn) error {
+		return errors.New("unsupported platform")
+	}
+}

component/dialer/control.go

@@ -0,0 +1,37 @@
+package dialer
+
+import (
+	"errors"
+	"net"
+	"syscall"
+)
+
+type controlFunc func(string, string, syscall.RawConn) error
+
+var (
+	_controlPool = make([]controlFunc, 0, 2)
+)
+
+func addControl(f controlFunc) {
+	_controlPool = append(_controlPool, f)
+}
+
+func setControl(i interface{}) {
+	control := func(address, network string, c syscall.RawConn) error {
+		for _, f := range _controlPool {
+			if err := f(address, network, c); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+
+	switch v := i.(type) {
+	case *net.Dialer:
+		v.Control = control
+	case *net.ListenConfig:
+		v.Control = control
+	default:
+		panic(errors.New("wrong type"))
+	}
+}

component/dialer/dialer.go

@@ -0,0 +1,22 @@
+package dialer
+
+import (
+	"context"
+	"net"
+)
+
+func Dial(network, address string) (net.Conn, error) {
+	return DialContext(context.Background(), network, address)
+}
+
+func DialContext(ctx context.Context, network, address string) (net.Conn, error) {
+	d := &net.Dialer{}
+	setControl(d)
+	return d.DialContext(ctx, network, address)
+}
+
+func ListenPacket(network, address string) (net.PacketConn, error) {
+	lc := &net.ListenConfig{}
+	setControl(lc)
+	return lc.ListenPacket(context.Background(), network, address)
+}

component/dialer/fwmark.go

@@ -0,0 +1,14 @@
+package dialer
+
+import (
+	"sync"
+)
+
+var _setOnce sync.Once
+
+// SetMark sets the mark for each packet sent through this dialer(socket).
+func SetMark(i int) {
+	_setOnce.Do(func() {
+		addControl(setMark(i))
+	})
+}

component/dialer/fwmark_linux.go

@@ -0,0 +1,15 @@
+package dialer
+
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func setMark(i int) controlFunc {
+	return func(_, _ string, c syscall.RawConn) error {
+		return c.Control(func(fd uintptr) {
+			unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_MARK, i)
+		})
+	}
+}

component/dialer/fwmark_others.go

@@ -0,0 +1,14 @@
+//go:build !linux
+
+package dialer
+
+import (
+	"errors"
+	"syscall"
+)
+
+func setMark(_ int) controlFunc {
+	return func(string, string, syscall.RawConn) error {
+		return errors.New("fwmark: linux only")
+	}
+}

component/dialer/resolver.go

@@ -0,0 +1,10 @@
+package dialer
+
+import "net"
+
+func init() {
+	// We must use this DialContext to query DNS
+	// when using net default resolver.
+	net.DefaultResolver.PreferGo = true
+	net.DefaultResolver.Dial = DialContext
+}

component/nat/nat.go

@@ -1,26 +1,26 @@
 /*
 Package nat provides simple NAT table implements.
 
-Normal (Full Cone) NAT
+* Normal (Full Cone) NAT
 A full cone NAT is one where all requests from the same internal IP address
 and port are mapped to the same external IP address and port. Furthermore,
 any external host can send a packet to the internal host, by sending a packet
 to the mapped external address.
 
-Restricted Cone NAT
+* Restricted Cone NAT
 A restricted cone NAT is one where all requests from the same internal IP
 address and port are mapped to the same external IP address and port.
 Unlike a full cone NAT, an external host (with IP address X) can send a
 packet to the internal host only if the internal host had previously sent
 a packet to IP address X.
 
-Port Restricted Cone NAT
+* Port Restricted Cone NAT
 A port restricted cone NAT is like a restricted cone NAT, but the restriction
 includes port numbers. Specifically, an external host can send a packet, with
 source IP address X and source port P, to the internal host only if the internal
 host had previously sent a packet to IP address X and port P.
 
-Symmetric NAT
+* Symmetric NAT
 A symmetric NAT is one where all requests from the same internal IP address
 and port, to a specific destination IP address and port, are mapped to the
 same external IP address and port. If the same host sends a packet with the

component/simple-obfs/http.go

@@ -0,0 +1,94 @@
+package obfs
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"math/rand"
+	"net"
+	"net/http"
+
+	"github.com/xjasonlyu/tun2socks/common/pool"
+)
+
+// HTTPObfs is shadowsocks http simple-obfs implementation
+type HTTPObfs struct {
+	net.Conn
+	host          string
+	port          string
+	buf           []byte
+	offset        int
+	firstRequest  bool
+	firstResponse bool
+}
+
+func (ho *HTTPObfs) Read(b []byte) (int, error) {
+	if ho.buf != nil {
+		n := copy(b, ho.buf[ho.offset:])
+		ho.offset += n
+		if ho.offset == len(ho.buf) {
+			pool.Put(ho.buf)
+			ho.buf = nil
+		}
+		return n, nil
+	}
+
+	if ho.firstResponse {
+		buf := pool.Get(pool.RelayBufferSize)
+		n, err := ho.Conn.Read(buf)
+		if err != nil {
+			pool.Put(buf)
+			return 0, err
+		}
+		idx := bytes.Index(buf[:n], []byte("\r\n\r\n"))
+		if idx == -1 {
+			pool.Put(buf)
+			return 0, io.EOF
+		}
+		ho.firstResponse = false
+		length := n - (idx + 4)
+		n = copy(b, buf[idx+4:n])
+		if length > n {
+			ho.buf = buf[:idx+4+length]
+			ho.offset = idx + 4 + n
+		} else {
+			pool.Put(buf)
+		}
+		return n, nil
+	}
+	return ho.Conn.Read(b)
+}
+
+func (ho *HTTPObfs) Write(b []byte) (int, error) {
+	if ho.firstRequest {
+		randBytes := make([]byte, 16)
+		rand.Read(randBytes)
+		req, _ := http.NewRequest("GET", fmt.Sprintf("http://%s/", ho.host), bytes.NewBuffer(b[:]))
+		req.Header.Set("User-Agent", fmt.Sprintf("curl/7.%d.%d", rand.Int()%54, rand.Int()%2))
+		req.Header.Set("Upgrade", "websocket")
+		req.Header.Set("Connection", "Upgrade")
+		req.Host = ho.host
+		if ho.port != "80" {
+			req.Host = fmt.Sprintf("%s:%s", ho.host, ho.port)
+		}
+		req.Header.Set("Sec-WebSocket-Key", base64.URLEncoding.EncodeToString(randBytes))
+		req.ContentLength = int64(len(b))
+		err := req.Write(ho.Conn)
+		ho.firstRequest = false
+		return len(b), err
+	}
+
+	return ho.Conn.Write(b)
+}
+
+// NewHTTPObfs return a HTTPObfs
+func NewHTTPObfs(conn net.Conn, host string, port string) net.Conn {
+	return &HTTPObfs{
+		Conn:          conn,
+		firstRequest:  true,
+		firstResponse: true,
+		host:          host,
+		port:          port,
+	}
+}

component/simple-obfs/obfs.go

@@ -0,0 +1,4 @@
+// Package obfs provides obfuscation functionality for Shadowsocks protocol.
+package obfs
+
+// Ref: github.com/Dreamacro/clash/component/simple-obfs

component/simple-obfs/tls.go

@@ -0,0 +1,198 @@
+package obfs
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"math/rand"
+	"net"
+	"time"
+
+	"github.com/xjasonlyu/tun2socks/common/pool"
+)
+
+func init() {
+	rand.Seed(time.Now().Unix())
+}
+
+const (
+	chunkSize = 1 << 14 // 2 ** 14 == 16 * 1024
+)
+
+// TLSObfs is shadowsocks tls simple-obfs implementation
+type TLSObfs struct {
+	net.Conn
+	server        string
+	remain        int
+	firstRequest  bool
+	firstResponse bool
+}
+
+func (to *TLSObfs) read(b []byte, discardN int) (int, error) {
+	buf := pool.Get(discardN)
+	_, err := io.ReadFull(to.Conn, buf)
+	if err != nil {
+		return 0, err
+	}
+	pool.Put(buf)
+
+	sizeBuf := make([]byte, 2)
+	_, err = io.ReadFull(to.Conn, sizeBuf)
+	if err != nil {
+		return 0, nil
+	}
+
+	length := int(binary.BigEndian.Uint16(sizeBuf))
+	if length > len(b) {
+		n, err := to.Conn.Read(b)
+		if err != nil {
+			return n, err
+		}
+		to.remain = length - n
+		return n, nil
+	}
+
+	return io.ReadFull(to.Conn, b[:length])
+}
+
+func (to *TLSObfs) Read(b []byte) (int, error) {
+	if to.remain > 0 {
+		length := to.remain
+		if length > len(b) {
+			length = len(b)
+		}
+
+		n, err := io.ReadFull(to.Conn, b[:length])
+		to.remain -= n
+		return n, err
+	}
+
+	if to.firstResponse {
+		// type + ver + len_size + 91 = 96
+		// type + ver + len_size + 1 = 6
+		// type + ver = 3
+		to.firstResponse = false
+		return to.read(b, 105)
+	}
+
+	// type + ver = 3
+	return to.read(b, 3)
+}
+func (to *TLSObfs) Write(b []byte) (int, error) {
+	length := len(b)
+	for i := 0; i < length; i += chunkSize {
+		end := i + chunkSize
+		if end > length {
+			end = length
+		}
+
+		n, err := to.write(b[i:end])
+		if err != nil {
+			return n, err
+		}
+	}
+	return length, nil
+}
+
+func (to *TLSObfs) write(b []byte) (int, error) {
+	if to.firstRequest {
+		helloMsg := makeClientHelloMsg(b, to.server)
+		_, err := to.Conn.Write(helloMsg)
+		to.firstRequest = false
+		return len(b), err
+	}
+
+	buf := &bytes.Buffer{}
+	buf.Write([]byte{0x17, 0x03, 0x03})
+	binary.Write(buf, binary.BigEndian, uint16(len(b)))
+	buf.Write(b)
+	_, err := to.Conn.Write(buf.Bytes())
+	return len(b), err
+}
+
+// NewTLSObfs return a SimpleObfs
+func NewTLSObfs(conn net.Conn, server string) net.Conn {
+	return &TLSObfs{
+		Conn:          conn,
+		server:        server,
+		firstRequest:  true,
+		firstResponse: true,
+	}
+}
+
+func makeClientHelloMsg(data []byte, server string) []byte {
+	random := make([]byte, 28)
+	sessionID := make([]byte, 32)
+	rand.Read(random)
+	rand.Read(sessionID)
+
+	buf := &bytes.Buffer{}
+
+	// handshake, TLS 1.0 version, length
+	buf.WriteByte(22)
+	buf.Write([]byte{0x03, 0x01})
+	length := uint16(212 + len(data) + len(server))
+	buf.WriteByte(byte(length >> 8))
+	buf.WriteByte(byte(length & 0xff))
+
+	// clientHello, length, TLS 1.2 version
+	buf.WriteByte(1)
+	buf.WriteByte(0)
+	binary.Write(buf, binary.BigEndian, uint16(208+len(data)+len(server)))
+	buf.Write([]byte{0x03, 0x03})
+
+	// random with timestamp, sid len, sid
+	binary.Write(buf, binary.BigEndian, uint32(time.Now().Unix()))
+	buf.Write(random)
+	buf.WriteByte(32)
+	buf.Write(sessionID)
+
+	// cipher suites
+	buf.Write([]byte{0x00, 0x38})
+	buf.Write([]byte{
+		0xc0, 0x2c, 0xc0, 0x30, 0x00, 0x9f, 0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0xaa, 0xc0, 0x2b, 0xc0, 0x2f,
+		0x00, 0x9e, 0xc0, 0x24, 0xc0, 0x28, 0x00, 0x6b, 0xc0, 0x23, 0xc0, 0x27, 0x00, 0x67, 0xc0, 0x0a,
+		0xc0, 0x14, 0x00, 0x39, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x33, 0x00, 0x9d, 0x00, 0x9c, 0x00, 0x3d,
+		0x00, 0x3c, 0x00, 0x35, 0x00, 0x2f, 0x00, 0xff,
+	})
+
+	// compression
+	buf.Write([]byte{0x01, 0x00})
+
+	// extension length
+	binary.Write(buf, binary.BigEndian, uint16(79+len(data)+len(server)))
+
+	// session ticket
+	buf.Write([]byte{0x00, 0x23})
+	binary.Write(buf, binary.BigEndian, uint16(len(data)))
+	buf.Write(data)
+
+	// server name
+	buf.Write([]byte{0x00, 0x00})
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+5))
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+3))
+	buf.WriteByte(0)
+	binary.Write(buf, binary.BigEndian, uint16(len(server)))
+	buf.Write([]byte(server))
+
+	// ec_point
+	buf.Write([]byte{0x00, 0x0b, 0x00, 0x04, 0x03, 0x01, 0x00, 0x02})
+
+	// groups
+	buf.Write([]byte{0x00, 0x0a, 0x00, 0x0a, 0x00, 0x08, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x19, 0x00, 0x18})
+
+	// signature
+	buf.Write([]byte{
+		0x00, 0x0d, 0x00, 0x20, 0x00, 0x1e, 0x06, 0x01, 0x06, 0x02, 0x06, 0x03, 0x05,
+		0x01, 0x05, 0x02, 0x05, 0x03, 0x04, 0x01, 0x04, 0x02, 0x04, 0x03, 0x03, 0x01,
+		0x03, 0x02, 0x03, 0x03, 0x02, 0x01, 0x02, 0x02, 0x02, 0x03,
+	})
+
+	// encrypt then mac
+	buf.Write([]byte{0x00, 0x16, 0x00, 0x00})
+
+	// extended master secret
+	buf.Write([]byte{0x00, 0x17, 0x00, 0x00})
+
+	return buf.Bytes()
+}

constant/metadata.go

@@ -1,12 +1,13 @@
-package adapter
+package constant
 
 import (
 	"bytes"
-	"encoding/json"
+	"encoding/binary"
+	"fmt"
 	"net"
 	"strconv"
 
-	"github.com/xjasonlyu/clash/component/socks5"
+	"github.com/xjasonlyu/tun2socks/transport/socks5"
 )
 
 const (
@@ -14,17 +15,21 @@ const (
 	UDP
 )
 
-type Network int
+type Network uint8
 
 func (n Network) String() string {
-	if n == TCP {
+	switch n {
+	case TCP:
 		return "tcp"
+	case UDP:
+		return "udp"
+	default:
+		return fmt.Sprintf("network(%d)", n)
 	}
-	return "udp"
 }
 
-func (n Network) MarshalJSON() ([]byte, error) {
-	return json.Marshal(n.String())
+func (n Network) MarshalText() ([]byte, error) {
+	return []byte(n.String()), nil
 }
 
 // Metadata implements the net.Addr interface.
@@ -36,16 +41,10 @@ type Metadata struct {
 	SrcPort uint16  `json:"sourcePort"`
 	MidPort uint16  `json:"dialerPort"`
 	DstPort uint16  `json:"destinationPort"`
-	Host    string  `json:"host"`
 }
 
 func (m *Metadata) DestinationAddress() string {
-	if m.Host != "" {
-		return net.JoinHostPort(m.Host, strconv.FormatUint(uint64(m.DstPort), 10))
-	} else if m.DstIP != nil {
-		return net.JoinHostPort(m.DstIP.String(), strconv.FormatUint(uint64(m.DstPort), 10))
-	}
-	return ""
+	return net.JoinHostPort(m.DstIP.String(), strconv.FormatUint(uint64(m.DstPort), 10))
 }
 
 func (m *Metadata) SourceAddress() string {
@@ -63,22 +62,18 @@ func (m *Metadata) UDPAddr() *net.UDPAddr {
 }
 
 func (m *Metadata) SerializesSocksAddr() socks5.Addr {
-	var buf [][]byte
-	port := []byte{uint8(m.DstPort >> 8), uint8(m.DstPort & 0xff)}
-	switch {
-	case m.Host != "": /* Domain */
-		aType := socks5.AtypDomainName
-		length := uint8(len(m.Host))
-		host := []byte(m.Host)
-		buf = [][]byte{{uint8(aType), length}, host, port}
-	case m.DstIP.To4() != nil: /* IPv4 */
+	var (
+		buf  [][]byte
+		port [2]byte
+	)
+	binary.BigEndian.PutUint16(port[:], m.DstPort)
+
+	if m.DstIP.To4() != nil /* IPv4 */ {
 		aType := socks5.AtypIPv4
-		host := m.DstIP.To4()
-		buf = [][]byte{{uint8(aType)}, host, port}
-	default: /* IPv6 */
+		buf = [][]byte{{aType}, m.DstIP.To4(), port[:]}
+	} else /* IPv6 */ {
 		aType := socks5.AtypIPv6
-		host := m.DstIP.To16()
-		buf = [][]byte{{uint8(aType)}, host, port}
+		buf = [][]byte{{aType}, m.DstIP.To16(), port[:]}
 	}
 	return bytes.Join(buf, nil)
 }
@@ -87,10 +82,8 @@ func (m *Metadata) Network() string {
 	return m.Net.String()
 }
 
+// String returns destination address of this metadata.
+// Also for implementing net.Addr interface.
 func (m *Metadata) String() string {
 	return m.DestinationAddress()
 }
-
-func (m *Metadata) Valid() bool {
-	return m.Host != "" || m.DstIP != nil
-}

constant/version.go

@@ -0,0 +1,10 @@
+package constant
+
+const (
+	Name = "tun2socks"
+)
+
+var (
+	Version   string
+	GitCommit string
+)

core/adapter.go

@@ -1,10 +1,14 @@
-package adapter
+package core
 
-import "net"
+import (
+	"net"
+
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
 
 type TCPConn interface {
 	net.Conn
-	Metadata() *Metadata
+	ID() *stack.TransportEndpointID
 }
 
 type UDPPacket interface {
@@ -14,18 +18,17 @@ type UDPPacket interface {
 	// Drop call after packet is used, could release resources in this function.
 	Drop()
 
+	// ID returns the transport endpoint id of packet.
+	ID() *stack.TransportEndpointID
+
 	// LocalAddr returns the source IP/Port of packet.
 	LocalAddr() net.Addr
 
-	// Metadata returns the metadata of packet.
-	Metadata() *Metadata
-
 	// RemoteAddr returns the destination IP/Port of packet.
 	RemoteAddr() net.Addr
 
 	// WriteBack writes the payload with source IP/Port equals addr
 	// - variable source IP/Port is important to STUN
-	// - if addr is not provided, WriteBack will write out UDP packet with SourceIP/Port equals to original Target,
-	//   this is important when using Fake-IP.
+	// - if addr is not provided, WriteBack will write out UDP packet with SourceIP/Port equals to original Target.
 	WriteBack([]byte, net.Addr) (int, error)
 }

core/device/device.go

@@ -0,0 +1,20 @@
+package device
+
+import (
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+// Device is the interface that implemented by network layer devices (e.g. tun),
+// and easy to use as stack.LinkEndpoint.
+type Device interface {
+	stack.LinkEndpoint
+
+	// Close stops and closes the device.
+	Close() error
+
+	// Name returns the current name of the device.
+	Name() string
+
+	// Type returns the driver type of the device.
+	Type() string
+}

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

@@ -1,9 +1,10 @@
-package rwc
+// Package rwbased provides the implementation of io.ReadWriter
+// based data-link layer endpoints.
+package rwbased
 
 import (
 	"errors"
 	"io"
-	"sync"
 
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/buffer"
@@ -11,28 +12,31 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 )
 
-// Endpoint wraps io.ReadWriter to stack.LinkEndpoint.
+var _ stack.LinkEndpoint = (*Endpoint)(nil)
+
+// Endpoint implements the interface of stack.LinkEndpoint from io.ReadWriter.
 type Endpoint struct {
+	// rw is the io.ReadWriter for reading and writing packets.
+	rw io.ReadWriter
+
+	// mtu (maximum transmission unit) is the maximum size of a packet.
 	mtu uint32
-	rwc io.ReadWriteCloser
 
-	wg sync.WaitGroup
-
-	dispatcher         stack.NetworkDispatcher
-	LinkEPCapabilities stack.LinkEndpointCapabilities
+	dispatcher stack.NetworkDispatcher
 }
 
 // New returns stack.LinkEndpoint(.*Endpoint) and error.
-func New(rwc io.ReadWriteCloser, mtu uint32) (*Endpoint, error) {
-	switch {
-	case mtu == 0:
+func New(rw io.ReadWriter, mtu uint32) (*Endpoint, error) {
+	if mtu == 0 {
 		return nil, errors.New("MTU size is zero")
-	case rwc == nil:
-		return nil, errors.New("RWC interface is nil")
+	}
+
+	if rw == nil {
+		return nil, errors.New("RW interface is nil")
 	}
 
 	return &Endpoint{
-		rwc: rwc,
+		rw:  rw,
 		mtu: mtu,
 	}, nil
 }
@@ -51,12 +55,10 @@ func (e *Endpoint) IsAttached() bool {
 
 // dispatchLoop dispatches packets to upper layer.
 func (e *Endpoint) dispatchLoop() {
-	e.wg.Add(1)
-	defer e.wg.Done()
-
 	for {
 		packet := make([]byte, e.mtu)
-		n, err := e.rwc.Read(packet)
+
+		n, err := e.rw.Read(packet)
 		if err != nil {
 			break
 		}
@@ -65,45 +67,35 @@ func (e *Endpoint) dispatchLoop() {
 			continue
 		}
 
-		var p tcpip.NetworkProtocolNumber
+		pkb := stack.NewPacketBuffer(stack.PacketBufferOptions{
+			Data: buffer.NewVectorisedView(n, []buffer.View{buffer.NewViewFromBytes(packet)}),
+		})
+
 		switch header.IPVersion(packet) {
 		case header.IPv4Version:
-			p = header.IPv4ProtocolNumber
+			e.dispatcher.DeliverNetworkPacket("", "", header.IPv4ProtocolNumber, pkb)
 		case header.IPv6Version:
-			p = header.IPv6ProtocolNumber
+			e.dispatcher.DeliverNetworkPacket("", "", header.IPv6ProtocolNumber, pkb)
 		}
-
-		e.dispatcher.DeliverNetworkPacket("", "", p, &stack.PacketBuffer{
-			Data: buffer.View(packet[:n]).ToVectorisedView(),
-		})
 	}
 }
 
-// writePacket writes packets back into io.ReadWriter.
-func (e *Endpoint) writePacket(pkt *stack.PacketBuffer) *tcpip.Error {
-	networkHdr := pkt.NetworkHeader().View()
-	transportHdr := pkt.TransportHeader().View()
-	payload := pkt.Data.ToView()
+func (e *Endpoint) writePacket(pkt *stack.PacketBuffer) tcpip.Error {
+	vView := buffer.NewVectorisedView(pkt.Size(), pkt.Views())
 
-	buf := buffer.NewVectorisedView(
-		len(networkHdr)+len(transportHdr)+len(payload),
-		[]buffer.View{networkHdr, transportHdr, payload},
-	)
-
-	if _, err := e.rwc.Write(buf.ToView()); err != nil {
-		return tcpip.ErrInvalidEndpointState
+	if _, err := e.rw.Write(vView.ToView()); err != nil {
+		return &tcpip.ErrInvalidEndpointState{}
 	}
-
 	return nil
 }
 
-// WritePacket writes packets back into io.ReadWriter.
-func (e *Endpoint) WritePacket(_ *stack.Route, _ *stack.GSO, _ tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
+// WritePacket writes packet back into io.ReadWriter.
+func (e *Endpoint) WritePacket(_ stack.RouteInfo, _ tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) tcpip.Error {
 	return e.writePacket(pkt)
 }
 
 // WritePackets writes packets back into io.ReadWriter.
-func (e *Endpoint) WritePackets(_ *stack.Route, _ *stack.GSO, pkts stack.PacketBufferList, _ tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
+func (e *Endpoint) WritePackets(_ stack.RouteInfo, pkts stack.PacketBufferList, _ tcpip.NetworkProtocolNumber) (int, tcpip.Error) {
 	n := 0
 	for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() {
 		if err := e.writePacket(pkt); err != nil {
@@ -114,12 +106,8 @@ func (e *Endpoint) WritePackets(_ *stack.Route, _ *stack.GSO, pkts stack.PacketB
 	return n, nil
 }
 
-// WriteRawPacket implements stack.LinkEndpoint.WriteRawPacket.
-func (e *Endpoint) WriteRawPacket(vv buffer.VectorisedView) *tcpip.Error {
-	pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
-		Data: vv,
-	})
-	return e.writePacket(pkt)
+func (e *Endpoint) WriteRawPacket(packetBuffer *stack.PacketBuffer) tcpip.Error {
+	return &tcpip.ErrNotSupported{}
 }
 
 // MTU implements stack.LinkEndpoint.MTU.
@@ -129,12 +117,7 @@ func (e *Endpoint) MTU() uint32 {
 
 // Capabilities implements stack.LinkEndpoint.Capabilities.
 func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities {
-	return e.LinkEPCapabilities
-}
-
-// GSOMaxSize returns the maximum GSO packet size.
-func (*Endpoint) GSOMaxSize() uint32 {
-	return 1 << 15
+	return stack.CapabilityNone
 }
 
 // MaxHeaderLength returns the maximum size of the link layer header. Given it
@@ -158,12 +141,4 @@ func (e *Endpoint) AddHeader(tcpip.LinkAddress, tcpip.LinkAddress, tcpip.Network
 }
 
 // Wait implements stack.LinkEndpoint.Wait.
-func (e *Endpoint) Wait() {
-	e.wg.Wait()
-}
-
-// Close closes io.ReadWriteCloser and set closed to true.
-func (e *Endpoint) Close() error {
-	e.rwc.Close()
-	return nil
-}
+func (e *Endpoint) Wait() {}

core/device/tun/io_unix.go

@@ -0,0 +1,33 @@
+//go:build darwin || freebsd || openbsd
+
+package tun
+
+import (
+	"github.com/xjasonlyu/tun2socks/common/pool"
+)
+
+const (
+	offset = 4 /* 4 bytes TUN_PI */
+
+	defaultMTU = 1500
+)
+
+func (t *TUN) Read(packet []byte) (n int, err error) {
+	buf := pool.Get(offset + len(packet))
+	defer pool.Put(buf)
+
+	if n, err = t.nt.Read(buf, offset); err != nil {
+		return
+	}
+
+	copy(packet, buf[offset:offset+n])
+	return
+}
+
+func (t *TUN) Write(packet []byte) (int, error) {
+	buf := pool.Get(offset + len(packet))
+	defer pool.Put(buf)
+
+	copy(buf[offset:], packet)
+	return t.nt.Write(buf[:offset+len(packet)], offset)
+}

core/device/tun/io_windows.go

@@ -0,0 +1,15 @@
+package tun
+
+const (
+	offset = 0
+
+	defaultMTU = 0 /* auto */
+)
+
+func (t *TUN) Read(packet []byte) (int, error) {
+	return t.nt.Read(packet, offset)
+}
+
+func (t *TUN) Write(packet []byte) (int, error) {
+	return t.nt.Write(packet, offset)
+}

core/device/tun/tun.go

@@ -0,0 +1,14 @@
+// Package tun provides TUN which implemented device.Device interface.
+package tun
+
+import (
+	"github.com/xjasonlyu/tun2socks/core/device"
+)
+
+const Driver = "tun"
+
+func (t *TUN) Type() string {
+	return Driver
+}
+
+var _ device.Device = (*TUN)(nil)

core/device/tun/tun_gvisor.go

@@ -0,0 +1,104 @@
+//go:build linux
+
+package tun
+
+import (
+	"fmt"
+	"unsafe"
+
+	"github.com/xjasonlyu/tun2socks/core/device"
+
+	"golang.org/x/sys/unix"
+	"gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
+	"gvisor.dev/gvisor/pkg/tcpip/link/rawfile"
+	"gvisor.dev/gvisor/pkg/tcpip/link/tun"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+type TUN struct {
+	stack.LinkEndpoint
+
+	fd   int
+	mtu  uint32
+	name string
+}
+
+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)
+	}
+
+	fd, err := tun.Open(t.name)
+	if err != nil {
+		return nil, fmt.Errorf("create tun: %w", err)
+	}
+	t.fd = fd
+
+	if t.mtu > 0 {
+		if err := setMTU(t.name, t.mtu); err != nil {
+			return nil, fmt.Errorf("set mtu: %w", err)
+		}
+	}
+
+	_mtu, err := rawfile.GetMTU(t.name)
+	if err != nil {
+		return nil, fmt.Errorf("get mtu: %w", err)
+	}
+	t.mtu = _mtu
+
+	ep, err := fdbased.New(&fdbased.Options{
+		MTU: t.mtu,
+		FDs: []int{fd},
+		// TUN only
+		EthernetHeader: false,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("create endpoint: %w", err)
+	}
+	t.LinkEndpoint = ep
+
+	return t, nil
+}
+
+func (t *TUN) Name() string {
+	return t.name
+}
+
+func (t *TUN) Close() error {
+	return unix.Close(t.fd)
+}
+
+func setMTU(name string, n uint32) error {
+	// open datagram socket
+	fd, err := unix.Socket(
+		unix.AF_INET,
+		unix.SOCK_DGRAM,
+		0,
+	)
+	if err != nil {
+		return err
+	}
+
+	defer unix.Close(fd)
+
+	const ifReqSize = unix.IFNAMSIZ + 64
+
+	// do ioctl call
+	var ifr [ifReqSize]byte
+	copy(ifr[:], name)
+	*(*uint32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = n
+	_, _, errno := unix.Syscall(
+		unix.SYS_IOCTL,
+		uintptr(fd),
+		uintptr(unix.SIOCSIFMTU),
+		uintptr(unsafe.Pointer(&ifr[0])),
+	)
+
+	if errno != 0 {
+		return fmt.Errorf("failed to set MTU: %w", errno)
+	}
+
+	return nil
+}

core/device/tun/tun_wireguard.go

@@ -0,0 +1,58 @@
+//go:build !linux
+
+package tun
+
+import (
+	"fmt"
+
+	"github.com/xjasonlyu/tun2socks/core/device"
+	"github.com/xjasonlyu/tun2socks/core/device/rwbased"
+
+	"golang.zx2c4.com/wireguard/tun"
+)
+
+type TUN struct {
+	*rwbased.Endpoint
+
+	nt   *tun.NativeTun
+	mtu  uint32
+	name string
+}
+
+func Open(name string, mtu uint32) (device.Device, error) {
+	t := &TUN{name: name, mtu: mtu}
+
+	forcedMTU := defaultMTU
+	if t.mtu > 0 {
+		forcedMTU = int(t.mtu)
+	}
+
+	nt, err := tun.CreateTUN(t.name, forcedMTU)
+	if err != nil {
+		return nil, fmt.Errorf("create tun: %w", err)
+	}
+	t.nt = nt.(*tun.NativeTun)
+
+	_mtu, err := nt.MTU()
+	if err != nil {
+		return nil, fmt.Errorf("get mtu: %w", err)
+	}
+	t.mtu = uint32(_mtu)
+
+	ep, err := rwbased.New(t, t.mtu)
+	if err != nil {
+		return nil, fmt.Errorf("create endpoint: %w", err)
+	}
+	t.Endpoint = ep
+
+	return t, nil
+}
+
+func (t *TUN) Name() string {
+	name, _ := t.nt.Name()
+	return name
+}
+
+func (t *TUN) Close() error {
+	return t.nt.Close()
+}

core/handler.go

@@ -0,0 +1,6 @@
+package core
+
+type Handler interface {
+	Add(TCPConn)
+	AddPacket(UDPPacket)
+}

core/stack/icmp.go

@@ -0,0 +1,24 @@
+package stack
+
+import (
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+)
+
+func withICMPHandler() Option {
+	return func(s *Stack) error {
+		// Add default route table for IPv4 and IPv6.
+		// This will handle all incoming ICMP packets.
+		s.SetRouteTable([]tcpip.Route{
+			{
+				Destination: header.IPv4EmptySubnet,
+				NIC:         s.nicID,
+			},
+			{
+				Destination: header.IPv6EmptySubnet,
+				NIC:         s.nicID,
+			},
+		})
+		return nil
+	}
+}

core/stack/nic.go

@@ -1,4 +1,4 @@
-package core
+package stack
 
 import (
 	"fmt"
@@ -9,7 +9,7 @@ import (
 
 const (
 	// defaultNICID is the ID of default NIC used by DefaultStack.
-	defaultNICID tcpip.NICID = 1
+	defaultNICID tcpip.NICID = 0x01
 
 	// nicPromiscuousModeEnabled is the value used by stack to enable
 	// or disable NIC's promiscuous mode.
@@ -20,31 +20,31 @@ const (
 	nicSpoofingEnabled = true
 )
 
-// WithCreatingNIC creates NIC for stack.
-func WithCreatingNIC(nicID tcpip.NICID, ep stack.LinkEndpoint) Option {
-	return func(s *stack.Stack) error {
-		if err := s.CreateNIC(nicID, ep); err != nil {
+// withCreatingNIC creates NIC for stack.
+func withCreatingNIC(ep stack.LinkEndpoint) Option {
+	return func(s *Stack) error {
+		if err := s.CreateNIC(s.nicID, ep); err != nil {
 			return fmt.Errorf("create NIC: %s", err)
 		}
 		return nil
 	}
 }
 
-// WithPromiscuousMode sets promiscuous mode in the given NIC.
-func WithPromiscuousMode(nicID tcpip.NICID, v bool) Option {
-	return func(s *stack.Stack) error {
-		if err := s.SetPromiscuousMode(nicID, v); err != nil {
+// withPromiscuousMode sets promiscuous mode in the given NIC.
+func withPromiscuousMode(v bool) Option {
+	return func(s *Stack) error {
+		if err := s.SetPromiscuousMode(s.nicID, v); err != nil {
 			return fmt.Errorf("set promiscuous mode: %s", err)
 		}
 		return nil
 	}
 }
 
-// WithSpoofing sets address spoofing in the given NIC, allowing
+// withSpoofing sets address spoofing in the given NIC, allowing
 // endpoints to bind to any address in the NIC.
-func WithSpoofing(nicID tcpip.NICID, v bool) Option {
-	return func(s *stack.Stack) error {
-		if err := s.SetSpoofing(nicID, v); err != nil {
+func withSpoofing(v bool) Option {
+	return func(s *Stack) error {
+		if err := s.SetSpoofing(s.nicID, v); err != nil {
 			return fmt.Errorf("set spoofing: %s", err)
 		}
 		return nil

core/stack/opts.go

@@ -1,4 +1,4 @@
-package core
+package stack
 
 import (
 	"fmt"
@@ -7,7 +7,6 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
 	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
 )
 
@@ -54,11 +53,50 @@ const (
 	tcpSACKEnabled = true
 )
 
-type Option func(*stack.Stack) error
+type Option func(*Stack) error
+
+// WithDefault sets all default values for stack.
+func WithDefault() Option {
+	return func(s *Stack) error {
+		opts := []Option{
+			WithDefaultTTL(defaultTimeToLive),
+			WithForwarding(ipForwardingEnabled),
+
+			// Config default stack ICMP settings.
+			WithICMPBurst(icmpBurst), WithICMPLimit(icmpLimit),
+
+			// We expect no packet loss, therefore we can bump buffers.
+			// Too large buffers thrash cache, so there is little point
+			// in too large buffers.
+			//
+			// Ref: https://github.com/majek/slirpnetstack/blob/master/stack.go
+			WithTCPBufferSizeRange(minBufferSize, defaultBufferSize, maxBufferSize),
+
+			WithTCPCongestionControl(tcpCongestionControlAlgorithm),
+			WithTCPDelay(tcpDelayEnabled),
+
+			// Receive Buffer Auto-Tuning Option, see:
+			// https://github.com/google/gvisor/issues/1666
+			WithTCPModerateReceiveBuffer(tcpModerateReceiveBufferEnabled),
+
+			// TCP selective ACK Option, see:
+			// https://tools.ietf.org/html/rfc2018
+			WithTCPSACKEnabled(tcpSACKEnabled),
+		}
+
+		for _, opt := range opts {
+			if err := opt(s); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	}
+}
 
 // WithDefaultTTL sets the default TTL used by stack.
 func WithDefaultTTL(ttl uint8) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		opt := tcpip.DefaultTTLOption(ttl)
 		if err := s.SetNetworkProtocolOption(ipv4.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set ipv4 default TTL: %s", err)
@@ -72,11 +110,11 @@ func WithDefaultTTL(ttl uint8) Option {
 
 // WithForwarding sets packet forwarding between NICs for IPv4 & IPv6.
 func WithForwarding(v bool) Option {
-	return func(s *stack.Stack) error {
-		if err := s.SetForwarding(ipv4.ProtocolNumber, v); err != nil {
+	return func(s *Stack) error {
+		if err := s.SetForwardingDefaultAndAllNICs(ipv4.ProtocolNumber, v); err != nil {
 			return fmt.Errorf("set ipv4 forwarding: %s", err)
 		}
-		if err := s.SetForwarding(ipv6.ProtocolNumber, v); err != nil {
+		if err := s.SetForwardingDefaultAndAllNICs(ipv6.ProtocolNumber, v); err != nil {
 			return fmt.Errorf("set ipv6 forwarding: %s", err)
 		}
 		return nil
@@ -86,7 +124,7 @@ func WithForwarding(v bool) Option {
 // WithICMPBurst sets the number of ICMP messages that can be sent
 // in a single burst.
 func WithICMPBurst(burst int) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		s.SetICMPBurst(burst)
 		return nil
 	}
@@ -95,7 +133,7 @@ func WithICMPBurst(burst int) Option {
 // WithICMPLimit sets the maximum number of ICMP messages permitted
 // by rate limiter.
 func WithICMPLimit(limit rate.Limit) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		s.SetICMPLimit(limit)
 		return nil
 	}
@@ -103,7 +141,7 @@ func WithICMPLimit(limit rate.Limit) Option {
 
 // WithTCPBufferSizeRange sets the receive and send buffer size range for TCP.
 func WithTCPBufferSizeRange(a, b, c int) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		rcvOpt := tcpip.TCPReceiveBufferSizeRangeOption{Min: a, Default: b, Max: c}
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &rcvOpt); err != nil {
 			return fmt.Errorf("set TCP receive buffer size range: %s", err)
@@ -118,7 +156,7 @@ func WithTCPBufferSizeRange(a, b, c int) Option {
 
 // WithTCPCongestionControl sets the current congestion control algorithm.
 func WithTCPCongestionControl(cc string) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		opt := tcpip.CongestionControlOption(cc)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP congestion control algorithm: %s", err)
@@ -129,7 +167,7 @@ func WithTCPCongestionControl(cc string) Option {
 
 // WithTCPDelay enables or disables Nagle's algorithm in TCP.
 func WithTCPDelay(v bool) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		opt := tcpip.TCPDelayEnabled(v)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP delay: %s", err)
@@ -140,7 +178,7 @@ func WithTCPDelay(v bool) Option {
 
 // WithTCPModerateReceiveBuffer sets receive buffer moderation for TCP.
 func WithTCPModerateReceiveBuffer(v bool) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		opt := tcpip.TCPModerateReceiveBufferOption(v)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP moderate receive buffer: %s", err)
@@ -151,7 +189,7 @@ func WithTCPModerateReceiveBuffer(v bool) Option {
 
 // WithTCPSACKEnabled sets the SACK option for TCP.
 func WithTCPSACKEnabled(v bool) Option {
-	return func(s *stack.Stack) error {
+	return func(s *Stack) error {
 		opt := tcpip.TCPSACKEnabled(v)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP SACK: %s", err)

core/stack/stack.go

@@ -0,0 +1,82 @@
+// Package stack provides a thin wrapper around a gVisor's stack.
+package stack
+
+import (
+	"github.com/xjasonlyu/tun2socks/core"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
+	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
+)
+
+type Stack struct {
+	*stack.Stack
+
+	handler core.Handler
+	nicID   tcpip.NICID
+}
+
+// New allocates a new *Stack with given options.
+func New(ep stack.LinkEndpoint, handler core.Handler, opts ...Option) (*Stack, error) {
+	s := &Stack{
+		Stack: stack.New(stack.Options{
+			NetworkProtocols: []stack.NetworkProtocolFactory{
+				ipv4.NewProtocol,
+				ipv6.NewProtocol,
+			},
+			TransportProtocols: []stack.TransportProtocolFactory{
+				tcp.NewProtocol,
+				udp.NewProtocol,
+				icmp.NewProtocol4,
+				icmp.NewProtocol6,
+			},
+		}),
+
+		handler: handler,
+		nicID:   defaultNICID,
+	}
+
+	opts = append(opts,
+		// Important: We must initiate transport protocol handlers
+		// before creating NIC, otherwise NIC would dispatch packets
+		// to stack and cause race condition.
+		withICMPHandler(), withTCPHandler(), withUDPHandler(),
+
+		// Create stack NIC and then bind link endpoint.
+		withCreatingNIC(ep),
+
+		// In past we did s.AddAddressRange to assign 0.0.0.0/0 onto
+		// the interface. We need that to be able to terminate all the
+		// incoming connections - to any ip. AddressRange API has been
+		// removed and the suggested workaround is to use Promiscuous
+		// mode. https://github.com/google/gvisor/issues/3876
+		//
+		// Ref: https://github.com/majek/slirpnetstack/blob/master/stack.go
+		withPromiscuousMode(nicPromiscuousModeEnabled),
+
+		// Enable spoofing if a stack may send packets from unowned addresses.
+		// This change required changes to some netgophers since previously,
+		// promiscuous mode was enough to let the netstack respond to all
+		// incoming packets regardless of the packet's destination address. Now
+		// that a stack.Route is not held for each incoming packet, finding a route
+		// may fail with local addresses we don't own but accepted packets for
+		// while in promiscuous mode. Since we also want to be able to send from
+		// any address (in response the received promiscuous mode packets), we need
+		// to enable spoofing.
+		//
+		// Ref: https://github.com/google/gvisor/commit/8c0701462a84ff77e602f1626aec49479c308127
+		withSpoofing(nicSpoofingEnabled),
+	)
+
+	for _, opt := range opts {
+		if err := opt(s); err != nil {
+			return nil, err
+		}
+	}
+
+	return s, nil
+}

core/stack/tcp.go

@@ -1,4 +1,4 @@
-package core
+package stack
 
 import (
 	"fmt"
@@ -10,9 +10,6 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
 	"gvisor.dev/gvisor/pkg/waiter"
-
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
 )
 
 const (
@@ -35,64 +32,42 @@ const (
 	tcpKeepaliveInterval = 30 * time.Second
 )
 
-type tcpHandleFunc func(adapter.TCPConn)
-
-func WithTCPHandler(handle tcpHandleFunc) Option {
-	return func(s *stack.Stack) error {
-		tcpForwarder := tcp.NewForwarder(s, defaultWndSize, maxConnAttempts, func(r *tcp.ForwarderRequest) {
+func withTCPHandler() Option {
+	return func(s *Stack) error {
+		tcpForwarder := tcp.NewForwarder(s.Stack, defaultWndSize, maxConnAttempts, func(r *tcp.ForwarderRequest) {
 			var wq waiter.Queue
 			id := r.ID()
 			ep, err := r.CreateEndpoint(&wq)
 			if err != nil {
-				log.Warnf("[STACK] %s create endpoint error: %v", formatID(&id), err)
 				// prevent potential half-open TCP connection leak.
 				r.Complete(true)
 				return
 			}
 			r.Complete(false)
 
-			if err := setKeepalive(ep); err != nil {
-				log.Warnf("[STACK] %s %v", formatID(&id), err)
-			}
+			setKeepalive(ep)
 
 			conn := &tcpConn{
 				Conn: gonet.NewTCPConn(&wq, ep),
-				metadata: &adapter.Metadata{
-					Net:     adapter.TCP,
-					SrcIP:   net.IP(id.RemoteAddress),
-					SrcPort: id.RemotePort,
-					DstIP:   net.IP(id.LocalAddress),
-					DstPort: id.LocalPort,
-				},
+				id:   &id,
 			}
-
-			handle(conn)
+			s.handler.Add(conn)
 		})
 		s.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
 		return nil
 	}
 }
 
-func formatID(id *stack.TransportEndpointID) string {
-	return fmt.Sprintf(
-		"%s:%d --> %s:%d",
-		id.RemoteAddress,
-		id.RemotePort,
-		id.LocalAddress,
-		id.LocalPort,
-	)
-}
-
 func setKeepalive(ep tcpip.Endpoint) error {
-	if err := ep.SetSockOptBool(tcpip.KeepaliveEnabledOption, true); err != nil {
-		return fmt.Errorf("set keepalive: %s", err)
-	}
-	idleOpt := tcpip.KeepaliveIdleOption(tcpKeepaliveIdle)
-	if err := ep.SetSockOpt(&idleOpt); err != nil {
+	ep.SocketOptions().SetKeepAlive(true)
+
+	idle := tcpip.KeepaliveIdleOption(tcpKeepaliveIdle)
+	if err := ep.SetSockOpt(&idle); err != nil {
 		return fmt.Errorf("set keepalive idle: %s", err)
 	}
-	intervalOpt := tcpip.KeepaliveIntervalOption(tcpKeepaliveInterval)
-	if err := ep.SetSockOpt(&intervalOpt); err != nil {
+
+	interval := tcpip.KeepaliveIntervalOption(tcpKeepaliveInterval)
+	if err := ep.SetSockOpt(&interval); err != nil {
 		return fmt.Errorf("set keepalive interval: %s", err)
 	}
 	return nil
@@ -100,9 +75,9 @@ func setKeepalive(ep tcpip.Endpoint) error {
 
 type tcpConn struct {
 	net.Conn
-	metadata *adapter.Metadata
+	id *stack.TransportEndpointID
 }
 
-func (c *tcpConn) Metadata() *adapter.Metadata {
-	return c.metadata
+func (c *tcpConn) ID() *stack.TransportEndpointID {
+	return c.id
 }

core/stack/udp.go

@@ -1,4 +1,4 @@
-package core
+package stack
 
 import (
 	"fmt"
@@ -9,26 +9,25 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip/header"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
-
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
 )
 
-const udpNoChecksum = true
+const (
+	// udpNoChecksum disables UDP checksum.
+	udpNoChecksum = true
+)
 
-type udpHandleFunc func(adapter.UDPPacket)
-
-func WithUDPHandler(handle udpHandleFunc) Option {
-	return func(s *stack.Stack) error {
-		udpHandlePacket := func(r *stack.Route, id stack.TransportEndpointID, pkt *stack.PacketBuffer) bool {
+func withUDPHandler() Option {
+	return func(s *Stack) error {
+		udpHandlePacket := func(id stack.TransportEndpointID, pkt *stack.PacketBuffer) bool {
 			// Ref: gVisor pkg/tcpip/transport/udp/endpoint.go HandlePacket
-			hdr := header.UDP(pkt.TransportHeader().View())
-			if int(hdr.Length()) > pkt.Data.Size()+header.UDPMinimumSize {
+			udpHdr := header.UDP(pkt.TransportHeader().View())
+			if int(udpHdr.Length()) > pkt.Data().Size()+header.UDPMinimumSize {
 				// Malformed packet.
 				s.Stats().UDP.MalformedPacketsReceived.Increment()
 				return true
 			}
 
-			if !verifyChecksum(r, hdr, pkt) {
+			if !verifyChecksum(udpHdr, pkt) {
 				// Checksum error.
 				s.Stats().UDP.ChecksumErrors.Increment()
 				return true
@@ -36,22 +35,16 @@ func WithUDPHandler(handle udpHandleFunc) Option {
 
 			s.Stats().UDP.PacketsReceived.Increment()
 
-			// make a clone here.
-			route := r.Clone()
 			packet := &udpPacket{
-				id: id,
-				r:  &route,
-				metadata: &adapter.Metadata{
-					Net:     adapter.UDP,
-					SrcIP:   net.IP(id.RemoteAddress),
-					SrcPort: id.RemotePort,
-					DstIP:   net.IP(id.LocalAddress),
-					DstPort: id.LocalPort,
-				},
-				payload: pkt.Data.ToView(),
+				s:        s,
+				id:       &id,
+				data:     pkt.Data().ExtractVV(),
+				nicID:    pkt.NICID,
+				netHdr:   pkt.Network(),
+				netProto: pkt.NetworkProtocolNumber,
 			}
 
-			handle(packet)
+			s.handler.AddPacket(packet)
 			return true
 		}
 		s.SetTransportProtocolHandler(udp.ProtocolNumber, udpHandlePacket)
@@ -60,28 +53,28 @@ func WithUDPHandler(handle udpHandleFunc) Option {
 }
 
 type udpPacket struct {
-	id       stack.TransportEndpointID
-	r        *stack.Route
-	metadata *adapter.Metadata
-	payload  []byte
+	s        *Stack
+	id       *stack.TransportEndpointID
+	data     buffer.VectorisedView
+	nicID    tcpip.NICID
+	netHdr   header.Network
+	netProto tcpip.NetworkProtocolNumber
 }
 
 func (p *udpPacket) Data() []byte {
-	return p.payload
+	return p.data.ToView()
 }
 
-func (p *udpPacket) Drop() {
-	p.r.Release()
+func (p *udpPacket) Drop() {}
+
+func (p *udpPacket) ID() *stack.TransportEndpointID {
+	return p.id
 }
 
 func (p *udpPacket) LocalAddr() net.Addr {
 	return &net.UDPAddr{IP: net.IP(p.id.LocalAddress), Port: int(p.id.LocalPort)}
 }
 
-func (p *udpPacket) Metadata() *adapter.Metadata {
-	return p.metadata
-}
-
 func (p *udpPacket) RemoteAddr() net.Addr {
 	return &net.UDPAddr{IP: net.IP(p.id.RemoteAddress), Port: int(p.id.RemotePort)}
 }
@@ -90,34 +83,41 @@ func (p *udpPacket) WriteBack(b []byte, addr net.Addr) (int, error) {
 	v := buffer.View(b)
 	if len(v) > header.UDPMaximumPacketSize {
 		// Payload can't possibly fit in a packet.
-		return 0, fmt.Errorf("%s", tcpip.ErrMessageTooLong)
+		return 0, fmt.Errorf("%s", &tcpip.ErrMessageTooLong{})
 	}
 
+	var (
+		localAddress tcpip.Address
+		localPort    uint16
+	)
+
+	if udpAddr, ok := addr.(*net.UDPAddr); !ok {
+		localAddress = p.netHdr.DestinationAddress()
+		localPort = p.id.LocalPort
+	} else if ipv4 := udpAddr.IP.To4(); ipv4 != nil {
+		localAddress = tcpip.Address(ipv4)
+		localPort = uint16(udpAddr.Port)
+	} else {
+		localAddress = tcpip.Address(udpAddr.IP)
+		localPort = uint16(udpAddr.Port)
+	}
+
+	route, err := p.s.FindRoute(p.nicID, localAddress, p.netHdr.SourceAddress(), p.netProto, false /* multicastLoop */)
+	if err != nil {
+		return 0, fmt.Errorf("%#v find route: %s", p.id, err)
+	}
+	defer route.Release()
+
 	data := v.ToVectorisedView()
-	// if addr is not provided, write back use original dst Addr as src Addr.
-	if addr == nil {
-		return sendUDP(p.r, data, p.id.LocalPort, p.id.RemotePort, udpNoChecksum)
+	if err = sendUDP(route, data, localPort, p.id.RemotePort, udpNoChecksum); err != nil {
+		return 0, fmt.Errorf("%v", err)
 	}
-
-	udpAddr, ok := addr.(*net.UDPAddr)
-	if !ok {
-		return 0, fmt.Errorf("type %T is not a valid udp address", addr)
-	}
-
-	r := p.r.Clone()
-	defer r.Release()
-	if ipv4 := udpAddr.IP.To4(); ipv4 != nil {
-		r.LocalAddress = tcpip.Address(ipv4)
-	} else {
-		r.LocalAddress = tcpip.Address(udpAddr.IP)
-	}
-	return sendUDP(&r, data, uint16(udpAddr.Port), p.id.RemotePort, udpNoChecksum)
+	return data.Size(), nil
 }
 
 // sendUDP sends a UDP segment via the provided network endpoint and under the
 // provided identity.
-func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort uint16, noChecksum bool) (int, error) {
-	// Allocate a buffer for the UDP header.
+func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort uint16, noChecksum bool) tcpip.Error {
 	pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
 		ReserveHeaderBytes: header.UDPMinimumSize + int(r.MaxHeaderLength()),
 		Data:               data,
@@ -138,8 +138,8 @@ func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort u
 	// On IPv4, UDP checksum is optional, and a zero value indicates the
 	// transmitter skipped the checksum generation (RFC768).
 	// On IPv6, UDP checksum is not optional (RFC2460 Section 8.1).
-	if r.Capabilities()&stack.CapabilityTXChecksumOffload == 0 &&
-		(!noChecksum || r.NetProto == header.IPv6ProtocolNumber) {
+	if r.RequiresTXTransportChecksum() &&
+		(!noChecksum || r.NetProto() == header.IPv6ProtocolNumber) {
 		xsum := r.PseudoHeaderChecksum(udp.ProtocolNumber, length)
 		for _, v := range data.Views() {
 			xsum = header.Checksum(v, xsum)
@@ -148,29 +148,31 @@ func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort u
 	}
 
 	ttl := r.DefaultTTL()
-	if err := r.WritePacket(nil /* gso */, stack.NetworkHeaderParams{
+
+	if err := r.WritePacket(stack.NetworkHeaderParams{
 		Protocol: udp.ProtocolNumber,
 		TTL:      ttl,
 		TOS:      0, /* default */
 	}, pkt); err != nil {
 		r.Stats().UDP.PacketSendErrors.Increment()
-		return 0, fmt.Errorf("%s", err)
+		return err
 	}
 
 	// Track count of packets sent.
 	r.Stats().UDP.PacketsSent.Increment()
-	return data.Size(), nil
+	return nil
 }
 
 // verifyChecksum verifies the checksum unless RX checksum offload is enabled.
 // On IPv4, UDP checksum is optional, and a zero value means the transmitter
 // omitted the checksum generation (RFC768).
 // On IPv6, UDP checksum is not optional (RFC2460 Section 8.1).
-func verifyChecksum(r *stack.Route, hdr header.UDP, pkt *stack.PacketBuffer) bool {
-	if r.Capabilities()&stack.CapabilityRXChecksumOffload == 0 &&
-		(hdr.Checksum() != 0 || r.NetProto == header.IPv6ProtocolNumber) {
-		xsum := r.PseudoHeaderChecksum(udp.ProtocolNumber, hdr.Length())
-		for _, v := range pkt.Data.Views() {
+func verifyChecksum(hdr header.UDP, pkt *stack.PacketBuffer) bool {
+	if !pkt.RXTransportChecksumValidated &&
+		(hdr.Checksum() != 0 || pkt.NetworkProtocolNumber == header.IPv6ProtocolNumber) {
+		netHdr := pkt.Network()
+		xsum := header.PseudoHeaderChecksum(udp.ProtocolNumber, netHdr.DestinationAddress(), netHdr.SourceAddress(), hdr.Length())
+		for _, v := range pkt.Data().Views() {
 			xsum = header.Checksum(v, xsum)
 		}
 		return hdr.CalculateChecksum(xsum) == 0xffff

docker/Dockerfile.aarch64

@@ -1,32 +0,0 @@
-FROM arm64v8/golang:alpine AS builder
-
-WORKDIR /app
-COPY . /app
-
-RUN apk add --no-cache make git \
-    && go mod download \
-    && make docker \
-    && /app/bin/tun2socks-docker -v
-
-FROM arm64v8/alpine:latest
-
-COPY ./scripts/entrypoint.sh /entrypoint.sh
-COPY --from=builder /app/bin/tun2socks-docker /usr/bin/tun2socks
-
-RUN apk add --update --no-cache iptables iproute2 \
-    && chmod +x /entrypoint.sh
-
-ENV TUN tun0
-ENV ETH eth0
-ENV TUN_ADDR=
-ENV TUN_MASK=
-ENV LOGLEVEL=
-ENV EXCLUDED=
-ENV EXTRACMD=
-
-ENV API=
-ENV DNS=
-ENV HOSTS=
-ENV PROXY=
-
-ENTRYPOINT ["/entrypoint.sh"]

docker/docker-compose.yml

@@ -1,35 +0,0 @@
-version: '2.4'
-
-services:
-  tun2socks:
-    image: xjasonlyu/tun2socks:arm64-dev
-    cap_add:
-      - NET_ADMIN
-    devices:
-        - '/dev/net/tun:/dev/net/tun'
-    environment:
-      - GODEBUG=madvdontneed=1
-      - PROXY=
-      - LOGLEVEL=warning
-      - API=:8080
-      - DNS=
-      - HOSTS=
-      - EXCLUDED=
-      - EXTRACMD=
-    networks:
-      switch:
-        ipv4_address: 172.20.1.20
-    restart: always
-    container_name: tun2socks
-
-networks:
-  switch:
-    name: switch
-    ipam:
-      driver: default
-      config:
-        - subnet: '172.20.1.0/25'
-          gateway: 172.20.1.1
-    driver: macvlan
-    driver_opts:
-      parent: eth0

docker/entrypoint.sh

@@ -0,0 +1,84 @@
+#!/bin/sh
+
+TUN="${TUN:-tun0}"
+ADDR="${ADDR:-198.18.0.1/15}"
+LOGLEVEL="${LOGLEVEL:-info}"
+
+# default values
+TABLE="${TABLE:-0x22b}"
+FWMARK="${FWMARK:-0x22b}"
+CLONE_MAIN="${CLONE_MAIN:-1}"
+
+create_tun() {
+  # create tun device
+  ip tuntap add mode tun dev "$TUN"
+  ip addr add "$ADDR" dev "$TUN"
+  ip link set dev "$TUN" up
+}
+
+create_table() {
+  if [ "$CLONE_MAIN" -ne 0 ]; then
+    # clone main route table
+    ip route show table main |
+      while read -r route; do
+        ip route add ${route%linkdown*} table "$TABLE"
+      done
+    # replace default route
+    ip route replace default dev "$TUN" table "$TABLE"
+  else
+    # just add default route
+    ip route add default dev "$TUN" table "$TABLE"
+  fi
+}
+
+config_route() {
+  # policy routing
+  ip rule add not fwmark "$FWMARK" table "$TABLE"
+  ip rule add fwmark "$FWMARK" to "$ADDR" prohibit
+
+  # add tun included routes
+  for addr in $(echo "$TUN_INCLUDED_ROUTES" | tr ',' '\n'); do
+    ip rule add to "$addr" table "$TABLE"
+  done
+
+  # add tun excluded routes
+  for addr in $(echo "$TUN_EXCLUDED_ROUTES" | tr ',' '\n'); do
+    ip rule add to "$addr" table main
+  done
+}
+
+main() {
+  create_tun
+  create_table
+  config_route
+
+  # execute extra commands
+  if [ -n "$EXTRA_COMMANDS" ]; then
+    sh -c "$EXTRA_COMMANDS"
+  fi
+
+  if [ -n "$MTU" ]; then
+    ARGS="-mtu $MTU"
+  fi
+
+  if [ -n "$STATS" ]; then
+    ARGS="$ARGS -stats $STATS"
+  fi
+
+  if [ -n "$TOKEN" ]; then
+    ARGS="$ARGS -token $TOKEN"
+  fi
+
+  if [ -n "$UDP_TIMEOUT" ]; then
+    ARGS="$ARGS -udp-timeout $UDP_TIMEOUT"
+  fi
+
+  exec tun2socks \
+    -loglevel "$LOGLEVEL" \
+    -fwmark "$FWMARK" \
+    -device "$TUN" \
+    -proxy "$PROXY" \
+    $ARGS
+}
+
+main || exit 1

engine/engine.go

@@ -0,0 +1,168 @@
+package engine
+
+import (
+	"errors"
+	"os"
+
+	"github.com/xjasonlyu/tun2socks/component/dialer"
+	"github.com/xjasonlyu/tun2socks/core/device"
+	"github.com/xjasonlyu/tun2socks/core/stack"
+	"github.com/xjasonlyu/tun2socks/log"
+	"github.com/xjasonlyu/tun2socks/proxy"
+	"github.com/xjasonlyu/tun2socks/stats"
+	"github.com/xjasonlyu/tun2socks/tunnel"
+)
+
+var _engine = &engine{}
+
+// Start starts the default engine up.
+func Start() error {
+	return _engine.start()
+}
+
+// Stop shuts the default engine down.
+func Stop() error {
+	return _engine.stop()
+}
+
+// Insert loads *Key to the default engine.
+func Insert(k *Key) {
+	_engine.insert(k)
+}
+
+type Key struct {
+	MTU        int
+	Mark       int
+	UDPTimeout int
+	Proxy      string
+	Stats      string
+	Token      string
+	Device     string
+	LogLevel   string
+	Interface  string
+	Version    bool
+}
+
+type engine struct {
+	*Key
+
+	stack  *stack.Stack
+	proxy  proxy.Proxy
+	device device.Device
+}
+
+func (e *engine) start() error {
+	if e.Key == nil {
+		return errors.New("empty key")
+	}
+
+	if e.Version {
+		showVersion()
+		os.Exit(0)
+	}
+
+	for _, f := range []func() error{
+		e.setLogLevel,
+		e.setMark,
+		e.setInterface,
+		e.setStats,
+		e.setUDPTimeout,
+		e.setProxy,
+		e.setDevice,
+		e.setStack,
+	} {
+		if err := f(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (e *engine) stop() error {
+	if e.device != nil {
+		return e.device.Close()
+	}
+	return nil
+}
+
+func (e *engine) insert(k *Key) {
+	e.Key = k
+}
+
+func (e *engine) setLogLevel() error {
+	level, err := log.ParseLevel(e.LogLevel)
+	if err != nil {
+		return err
+	}
+	log.SetLevel(level)
+	return nil
+}
+
+func (e *engine) setMark() error {
+	if e.Mark != 0 {
+		dialer.SetMark(e.Mark)
+		log.Infof("[DIALER] set fwmark: %#x", e.Mark)
+	}
+	return nil
+}
+
+func (e *engine) setInterface() error {
+	if e.Interface != "" {
+		if err := dialer.BindToInterface(e.Interface); err != nil {
+			return err
+		}
+		log.Infof("[DIALER] use interface: %s", e.Interface)
+	}
+	return nil
+}
+
+func (e *engine) setStats() error {
+	if e.Stats != "" {
+		go func() {
+			_ = stats.Start(e.Stats, e.Token)
+		}()
+		log.Infof("[STATS] serve at: http://%s", e.Stats)
+	}
+	return nil
+}
+
+func (e *engine) setUDPTimeout() error {
+	if e.UDPTimeout > 0 {
+		tunnel.SetUDPTimeout(e.UDPTimeout)
+	}
+	return nil
+}
+
+func (e *engine) setProxy() (err error) {
+	if e.Proxy == "" {
+		return errors.New("empty proxy")
+	}
+
+	e.proxy, err = parseProxy(e.Proxy)
+	proxy.SetDialer(e.proxy)
+	return
+}
+
+func (e *engine) setDevice() (err error) {
+	if e.Device == "" {
+		return errors.New("empty device")
+	}
+
+	e.device, err = parseDevice(e.Device, uint32(e.MTU))
+	return
+}
+
+func (e *engine) setStack() (err error) {
+	defer func() {
+		if err == nil {
+			log.Infof(
+				"[STACK] %s://%s <-> %s://%s",
+				e.device.Type(), e.device.Name(),
+				e.proxy.Proto(), e.proxy.Addr(),
+			)
+		}
+	}()
+
+	e.stack, err = stack.New(e.device, &fakeTunnel{}, stack.WithDefault())
+	return
+}

engine/parse.go

@@ -0,0 +1,124 @@
+package engine
+
+import (
+	"encoding/base64"
+	"fmt"
+	"net/url"
+	"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"
+)
+
+func parseDevice(s string, mtu uint32) (device.Device, error) {
+	if !strings.Contains(s, "://") {
+		s = fmt.Sprintf("%s://%s", tun.Driver /* default driver */, s)
+	}
+
+	u, err := url.Parse(s)
+	if err != nil {
+		return nil, err
+	}
+
+	name := u.Host
+	driver := strings.ToLower(u.Scheme)
+
+	switch driver {
+	case fd.Driver:
+		return fd.Open(name, mtu)
+	case tun.Driver:
+		return tun.Open(name, mtu)
+	default:
+		return nil, fmt.Errorf("unsupported driver: %s", driver)
+	}
+}
+
+func parseProxy(s string) (proxy.Proxy, error) {
+	if !strings.Contains(s, "://") {
+		s = fmt.Sprintf("%s://%s", proto.Socks5 /* default protocol */, s)
+	}
+
+	u, err := url.Parse(s)
+	if err != nil {
+		return nil, err
+	}
+
+	protocol := strings.ToLower(u.Scheme)
+
+	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(parseSocks5(u))
+	case proto.Shadowsocks.String():
+		return proxy.NewShadowsocks(parseShadowsocks(u))
+	default:
+		return nil, fmt.Errorf("unsupported protocol: %s", protocol)
+	}
+}
+
+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
+
+	if pass, set := u.User.Password(); set {
+		method = u.User.Username()
+		password = pass
+	} else {
+		data, _ := base64.RawURLEncoding.DecodeString(u.User.String())
+		userInfo := strings.SplitN(string(data), ":", 2)
+		if len(userInfo) == 2 {
+			method = userInfo[0]
+			password = userInfo[1]
+		}
+	}
+
+	rawQuery, _ := url.QueryUnescape(u.RawQuery)
+	for _, s := range strings.Split(rawQuery, ";") {
+		data := strings.SplitN(s, "=", 2)
+		if len(data) != 2 {
+			continue
+		}
+		key := data[0]
+		value := data[1]
+
+		switch key {
+		case "obfs":
+			obfsMode = value
+		case "obfs-host":
+			obfsHost = value
+		}
+	}
+
+	return
+}

engine/tunnel.go

@@ -0,0 +1,18 @@
+package engine
+
+import (
+	"github.com/xjasonlyu/tun2socks/core"
+	"github.com/xjasonlyu/tun2socks/tunnel"
+)
+
+var _ core.Handler = (*fakeTunnel)(nil)
+
+type fakeTunnel struct{}
+
+func (*fakeTunnel) Add(conn core.TCPConn) {
+	tunnel.Add(conn)
+}
+
+func (*fakeTunnel) AddPacket(packet core.UDPPacket) {
+	tunnel.AddPacket(packet)
+}

engine/version.go

@@ -0,0 +1,22 @@
+package engine
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+
+	V "github.com/xjasonlyu/tun2socks/constant"
+)
+
+func showVersion() {
+	fmt.Print(versionString())
+	fmt.Print(releaseString())
+}
+
+func versionString() string {
+	return fmt.Sprintf("%s-%s\n", V.Name, strings.TrimPrefix(V.Version, "v"))
+}
+
+func releaseString() string {
+	return fmt.Sprintf("%s/%s, %s, %s\n", runtime.GOOS, runtime.GOARCH, runtime.Version(), V.GitCommit)
+}

go.mod

@@ -1,22 +1,28 @@
 module github.com/xjasonlyu/tun2socks
 
-go 1.15
+go 1.17
 
 require (
-	github.com/Dreamacro/go-shadowsocks2 v0.1.6
+	github.com/Dreamacro/go-shadowsocks2 v0.1.7
 	github.com/go-chi/chi v4.1.2+incompatible
-	github.com/go-chi/cors v1.1.1
+	github.com/go-chi/cors v1.2.0
 	github.com/go-chi/render v1.0.1
-	github.com/gofrs/uuid v3.3.0+incompatible
+	github.com/gofrs/uuid v4.1.0+incompatible
 	github.com/gorilla/websocket v1.4.2
-	github.com/sirupsen/logrus v1.7.0
-	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8
-	github.com/urfave/cli/v2 v2.2.0
-	github.com/xjasonlyu/clash v0.15.1-0.20201105074459-aa45c8b56cf6
-	go.uber.org/atomic v1.7.0
-	golang.org/x/net v0.0.0-20201031054903-ff519b6c9102 // indirect
-	golang.org/x/sys v0.0.0-20201101102859-da207088b7d1 // indirect
-	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
-	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
-	gvisor.dev/gvisor v0.0.0-20201105065002-ab9a79fe812a
+	github.com/sirupsen/logrus v1.8.1
+	github.com/stretchr/testify v1.7.0
+	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

@@ -1,453 +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 v0.52.1-0.20200122224058-0482b626c726/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
-github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
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-github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
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-github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
-github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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-github.com/Microsoft/go-winio v0.4.15-0.20200908182639-5b44b70ab3ab/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
-github.com/Microsoft/hcsshim v0.8.6/go.mod h1:Op3hHsoHPAvb6lceZHDtd9OkTew38wNoXnJs8iY7rUg=
-github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
-github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
-github.com/cenkalti/backoff v1.1.1-0.20190506075156-2146c9339422/go.mod h1:b6Nc7NRH5C4aCISLry0tLnTjcuTEvoiqcWDdsU0sOGM=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
-github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
-github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
-github.com/cilium/ebpf v0.0.0-20200110133405-4032b1d8aae3/go.mod h1:MA5e5Lr8slmEg9bt0VpxxWqJlO4iwu3FBdHUzV7wQVg=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/containerd/cgroups v0.0.0-20181219155423-39b18af02c41/go.mod h1:X9rLEHIqSf/wfK8NsPqxJmeZgW4pcfzdXITDrUSJ6uI=
-github.com/containerd/console v0.0.0-20191206165004-02ecf6a7291e/go.mod h1:8Pf4gM6VEbTNRIT26AyyU7hxdQU3MvAvxVI0sc00XBE=
-github.com/containerd/containerd v1.3.4/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
-github.com/containerd/continuity v0.0.0-20200928162600-f2cc35102c2a/go.mod h1:W0qIOTD7mp2He++YVq+kgfXezRYqzP1uDuMVH1bITDY=
-github.com/containerd/fifo v0.0.0-20191213151349-ff969a566b00/go.mod h1:jPQ2IAeZRCYxpS/Cm1495vGFww6ecHmMk1YJH2Q5ln0=
-github.com/containerd/go-runc v0.0.0-20200220073739-7016d3ce2328/go.mod h1:PpyHrqVs8FTi9vpyHwPwiNEGaACDxT/N/pLcvMSRA9g=
-github.com/containerd/ttrpc v0.0.0-20200121165050-0be804eadb15/go.mod h1:UAxOpgT9ziI0gJrmKvgcZivgxOp8iFPSk8httJEt98Y=
-github.com/containerd/typeurl v0.0.0-20200205145503-b45ef1f1f737/go.mod h1:TB1hUtrpaiO88KEK56ijojHS1+NeF0izUACaJW2mdXg=
-github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/go-systemd/v22 v22.0.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+1atmu1JpKERPPk=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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 github.com/go-chi/chi v4.1.2+incompatible h1:fGFk2Gmi/YKXk0OmGfBh0WgmN3XB8lVnEyNz34tQRec=
 github.com/go-chi/chi v4.1.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
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 github.com/go-chi/render v1.0.1 h1:4/5tis2cKaNdnv9zFLfXzcquC9HbeZgCnxGnKrltBS8=
 github.com/go-chi/render v1.0.1/go.mod h1:pq4Rr7HbnsdaeHagklXub+p6Wd16Af5l9koip1OvJns=
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-github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
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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=
-k8s.io/client-go v0.16.13/go.mod h1:UKvVT4cajC2iN7DCjLgT0KVY/cbY6DGdUCyRiIfws5M=
-k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
-k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
-k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
-k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
-k8s.io/kube-openapi v0.0.0-20200410163147-594e756bea31/go.mod h1:1TqjTSzOxsLGIKfj0lK8EeCP7K1iUG65v09OM0/WG5E=
-k8s.io/utils v0.0.0-20190801114015-581e00157fb1/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+gvisor.dev/gvisor v0.0.0-20211029210705-806fa5c3235c h1:S4L2OVKs48LB9vVbPaiEfRqon+dn0wm3MABd2cyvjkc=
+gvisor.dev/gvisor v0.0.0-20211029210705-806fa5c3235c/go.mod h1:btyTBPTxT8AFMvW7yctFJ2nPCEDWZLpmKQEZ0gG+bbQ=

internal/api/errors.go

@@ -1,24 +0,0 @@
-// Clash: https://github.com/Dreamacro/clash/blob/master/hub/route/errors.go
-
-package api
-
-var (
-	ErrUnauthorized   = newError("Unauthorized")
-	ErrBadRequest     = newError("Body invalid")
-	ErrForbidden      = newError("Forbidden")
-	ErrNotFound       = newError("Resource not found")
-	ErrRequestTimeout = newError("Timeout")
-)
-
-// HTTPError is custom HTTP error for API
-type HTTPError struct {
-	Message string `json:"message"`
-}
-
-func (e *HTTPError) Error() string {
-	return e.Message
-}
-
-func newError(msg string) *HTTPError {
-	return &HTTPError{Message: msg}
-}

internal/cmd/cmd.go

@@ -1,100 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"os"
-	"os/signal"
-	"runtime"
-	"syscall"
-	"time"
-
-	"github.com/urfave/cli/v2"
-
-	"github.com/xjasonlyu/clash/component/dialer"
-	"github.com/xjasonlyu/tun2socks/internal/api"
-	"github.com/xjasonlyu/tun2socks/internal/core"
-	"github.com/xjasonlyu/tun2socks/internal/dev"
-	"github.com/xjasonlyu/tun2socks/internal/dns"
-	"github.com/xjasonlyu/tun2socks/internal/proxy"
-	"github.com/xjasonlyu/tun2socks/internal/tunnel"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
-)
-
-func bindToInterface(name string) {
-	dialer.DialHook = dialer.DialerWithInterface(name)
-	dialer.ListenPacketHook = dialer.ListenPacketWithInterface(name)
-}
-
-func printVersion(app *cli.App) {
-	fmt.Printf("%s %s\n%s/%s, %s, %s\n",
-		app.Name,
-		app.Version,
-		runtime.GOOS,
-		runtime.GOARCH,
-		runtime.Version(),
-		app.Compiled.Format(time.RFC3339),
-	)
-}
-
-func Main(c *cli.Context) error {
-	if c.Bool("version") {
-		printVersion(c.App)
-		return nil
-	}
-
-	level, err := log.ParseLevel(c.String("loglevel"))
-	if err != nil {
-		return err
-	}
-	log.SetLevel(level)
-
-	if c.IsSet("interface") {
-		name := c.String("interface")
-		bindToInterface(name)
-		log.Infof("[IFCE] bind to interface: %s", name)
-	}
-
-	if c.IsSet("api") { /* initiate API */
-		raw := c.String("api")
-		if err := api.Start(raw, c.App); err != nil {
-			return fmt.Errorf("start API server %s: %w", raw, err)
-		}
-		log.Infof("[API] listen and serve at: %s", raw)
-	}
-
-	if c.IsSet("dns") { /* initiate DNS */
-		raw := c.String("dns")
-		if err := dns.Start(raw, c.StringSlice("hosts")); err != nil {
-			return fmt.Errorf("start DNS server %s: %w", raw, err)
-		}
-		log.Infof("[DNS] listen and serve at: %s", raw)
-	}
-
-	deviceURL := c.String("device")
-	device, err := dev.Open(deviceURL)
-	if err != nil {
-		return fmt.Errorf("open device %s: %w", deviceURL, err)
-	}
-	defer func() {
-		err := device.Close()
-		if err != nil {
-			log.Errorf("close device %s error: %v", deviceURL, err)
-		}
-	}()
-
-	proxyURL := c.String("proxy")
-	if err := proxy.Register(proxyURL); err != nil {
-		return fmt.Errorf("register proxy %s: %w", proxyURL, err)
-	}
-
-	if _, err := core.NewDefaultStack(device, tunnel.Add, tunnel.AddPacket); err != nil {
-		return fmt.Errorf("initiate stack: %w", err)
-	}
-	log.Infof("[STACK] %s --> %s", device.String(), proxy.String())
-
-	sigCh := make(chan os.Signal, 1)
-	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
-	<-sigCh
-
-	return nil
-}

internal/cmd/flags.go

@@ -1,51 +0,0 @@
-package cmd
-
-import "github.com/urfave/cli/v2"
-
-var (
-	API = cli.StringFlag{
-		Name:  "api",
-		Usage: "URL of external API to listen",
-	}
-
-	Device = cli.StringFlag{
-		Name:    "device",
-		Aliases: []string{"d"},
-		Usage:   "URL of device to open",
-	}
-
-	DNS = cli.StringFlag{
-		Name:  "dns",
-		Usage: "URL of fake DNS to listen",
-	}
-
-	Hosts = cli.StringSliceFlag{
-		Name:  "hosts",
-		Usage: "Extra hosts mapping",
-	}
-
-	Interface = cli.StringFlag{
-		Name:    "interface",
-		Aliases: []string{"i"},
-		Usage:   "Bind interface to dial",
-	}
-
-	LogLevel = cli.StringFlag{
-		Name:    "loglevel",
-		Aliases: []string{"l"},
-		Usage:   "Set logging level",
-		Value:   "INFO",
-	}
-
-	Proxy = cli.StringFlag{
-		Name:    "proxy",
-		Aliases: []string{"p"},
-		Usage:   "URL of proxy to dial",
-	}
-
-	Version = cli.BoolFlag{
-		Name:    "version",
-		Aliases: []string{"v"},
-		Usage:   "Print current version",
-	}
-)

internal/core/icmp.go

@@ -1,43 +0,0 @@
-package core
-
-import (
-	"fmt"
-	"net"
-
-	"gvisor.dev/gvisor/pkg/tcpip"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-)
-
-type icmpHandleFunc func()
-
-func WithICMPHandler(_ icmpHandleFunc) Option {
-	return func(s *stack.Stack) error {
-		// Add default route table for IPv4 and IPv6
-		// This will handle all incoming ICMP packets.
-		s.SetRouteTable([]tcpip.Route{
-			{
-				Destination: mustSubnet("0.0.0.0/0"),
-				NIC:         defaultNICID,
-			},
-			{
-				Destination: mustSubnet("::/0"),
-				NIC:         defaultNICID,
-			},
-		})
-		return nil
-	}
-}
-
-// mustSubnet returns tcpip.Subnet from CIDR string.
-func mustSubnet(s string) tcpip.Subnet {
-	_, ipNet, err := net.ParseCIDR(s)
-	if err != nil {
-		panic(fmt.Errorf("unable to ParseCIDR(%s): %w", s, err))
-	}
-
-	subnet, err := tcpip.NewSubnet(tcpip.Address(ipNet.IP), tcpip.AddressMask(ipNet.Mask))
-	if err != nil {
-		panic(fmt.Errorf("unable to NewSubnet(%s): %w", ipNet, err))
-	}
-	return subnet
-}

internal/core/stack.go

@@ -1,82 +0,0 @@
-package core
-
-import (
-	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
-	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
-)
-
-// NewStack returns *stack.Stack with provided options.
-func NewStack(opts ...Option) (*stack.Stack, error) {
-	ipstack := stack.New(stack.Options{
-		NetworkProtocols: []stack.NetworkProtocolFactory{
-			ipv4.NewProtocol,
-			ipv6.NewProtocol,
-		},
-		TransportProtocols: []stack.TransportProtocolFactory{
-			tcp.NewProtocol,
-			udp.NewProtocol,
-			icmp.NewProtocol4,
-			icmp.NewProtocol6,
-		},
-	})
-
-	for _, opt := range opts {
-		if err := opt(ipstack); err != nil {
-			return nil, err
-		}
-	}
-
-	return ipstack, nil
-}
-
-// NewDefaultStack calls NewStack with default options.
-func NewDefaultStack(linkEp stack.LinkEndpoint, th tcpHandleFunc, uh udpHandleFunc) (*stack.Stack, error) {
-	return NewStack(
-		WithDefaultTTL(defaultTimeToLive),
-		WithForwarding(ipForwardingEnabled),
-
-		// Config default stack ICMP settings.
-		WithICMPBurst(icmpBurst), WithICMPLimit(icmpLimit),
-
-		// We expect no packet loss, therefore we can bump buffers.
-		// Too large buffers thrash cache, so there is little point
-		// in too large buffers.
-		//
-		// Ref: https://github.com/majek/slirpnetstack/blob/master/stack.go
-		WithTCPBufferSizeRange(minBufferSize, defaultBufferSize, maxBufferSize),
-
-		WithTCPCongestionControl(tcpCongestionControlAlgorithm),
-		WithTCPDelay(tcpDelayEnabled),
-
-		// Receive Buffer Auto-Tuning Option, see:
-		// https://github.com/google/gvisor/issues/1666
-		WithTCPModerateReceiveBuffer(tcpModerateReceiveBufferEnabled),
-
-		// TCP selective ACK Option, see:
-		// https://tools.ietf.org/html/rfc2018
-		WithTCPSACKEnabled(tcpSACKEnabled),
-
-		// Important: We must initiate transport protocol handlers
-		// before creating NIC, otherwise NIC would dispatch packets
-		// to stack and cause race condition.
-		WithICMPHandler(nil), WithTCPHandler(th), WithUDPHandler(uh),
-
-		// Create stack NIC and then bind link endpoint.
-		WithCreatingNIC(defaultNICID, linkEp),
-
-		// In past we did s.AddAddressRange to assign 0.0.0.0/0 onto
-		// the interface. We need that to be able to terminate all the
-		// incoming connections - to any ip. AddressRange API has been
-		// removed and the suggested workaround is to use Promiscuous
-		// mode. https://github.com/google/gvisor/issues/3876
-		//
-		// Ref: https://github.com/majek/slirpnetstack/blob/master/stack.go
-		WithPromiscuousMode(defaultNICID, nicPromiscuousModeEnabled),
-
-		WithSpoofing(defaultNICID, nicSpoofingEnabled),
-	)
-}

internal/dev/dev.go

@@ -1,74 +0,0 @@
-package dev
-
-import (
-	"errors"
-	"io"
-	"net/url"
-	"strings"
-
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-
-	"github.com/xjasonlyu/tun2socks/internal/dev/tun"
-)
-
-const defaultScheme = "tun"
-
-type Device struct {
-	url *url.URL
-	io.Closer
-	stack.LinkEndpoint
-}
-
-func Open(deviceURL string) (device *Device, err error) {
-	if !strings.Contains(deviceURL, "://") {
-		deviceURL = defaultScheme + "://" + deviceURL
-	}
-
-	var u *url.URL
-	if u, err = url.Parse(deviceURL); err != nil {
-		return
-	}
-
-	var (
-		ep stack.LinkEndpoint
-		c  io.Closer
-	)
-	switch strings.ToLower(u.Scheme) {
-	case "tun":
-		name := u.Host
-		ep, c, err = tun.Open(name)
-	default:
-		err = errors.New("unsupported device type")
-	}
-
-	if err != nil {
-		return
-	}
-
-	device = &Device{
-		url:          u,
-		Closer:       c,
-		LinkEndpoint: ep,
-	}
-	return
-}
-
-// Close closes device.
-func (d *Device) Close() error {
-	return d.Closer.Close()
-}
-
-// Name returns name of device.
-func (d *Device) Name() string {
-	return d.url.Host
-}
-
-// Type returns type of device.
-func (d *Device) Type() string {
-	return strings.ToLower(d.url.Scheme)
-}
-
-// String returns full URL string.
-func (d *Device) String() string {
-	return d.url.String()
-}

internal/dev/tun/tun.go

@@ -1,15 +0,0 @@
-// +build !darwin,!linux
-
-package tun
-
-import (
-	"fmt"
-	"io"
-	"runtime"
-
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-)
-
-func Open(_ string) (stack.LinkEndpoint, io.Closer, error) {
-	return nil, nil, fmt.Errorf("operation was not supported on %s", runtime.GOOS)
-}

internal/dev/tun/tun_darwin.go

@@ -1,70 +0,0 @@
-package tun
-
-import (
-	"fmt"
-	"io"
-	"syscall"
-	"unsafe"
-
-	"github.com/songgao/water"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-
-	"github.com/xjasonlyu/tun2socks/pkg/link/rwc"
-)
-
-func Open(name string) (ep stack.LinkEndpoint, c io.Closer, err error) {
-	config := water.Config{
-		DeviceType: water.TUN,
-	}
-	config.Name = name
-
-	var ifce *water.Interface
-	ifce, err = water.New(config)
-	if err != nil {
-		return
-	}
-
-	var mtu uint32
-	mtu, err = getMTU(name)
-	if err != nil {
-		return
-	}
-
-	ep, err = rwc.New(ifce, mtu)
-	c = ifce
-
-	return
-}
-
-func getMTU(name string) (uint32, error) {
-	// open datagram socket
-	fd, err := syscall.Socket(
-		syscall.AF_INET,
-		syscall.SOCK_DGRAM,
-		0,
-	)
-	if err != nil {
-		return 0, err
-	}
-
-	defer syscall.Close(fd)
-
-	// do ioctl call
-	var ifr struct {
-		name [16]byte
-		mtu  uint32
-	}
-	copy(ifr.name[:], name)
-
-	_, _, errno := syscall.Syscall(
-		syscall.SYS_IOCTL,
-		uintptr(fd),
-		uintptr(syscall.SIOCGIFMTU),
-		uintptr(unsafe.Pointer(&ifr)),
-	)
-	if errno != 0 {
-		return 0, fmt.Errorf("get MTU on %s: %s", name, errno.Error())
-	}
-
-	return ifr.mtu, nil
-}

internal/dev/tun/tun_linux.go

@@ -1,43 +0,0 @@
-package tun
-
-import (
-	"io"
-	"syscall"
-
-	"gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
-	"gvisor.dev/gvisor/pkg/tcpip/link/rawfile"
-	"gvisor.dev/gvisor/pkg/tcpip/link/tun"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-)
-
-type closeFunc func() error
-
-func (f closeFunc) Close() error {
-	return f()
-}
-
-func Open(name string) (ep stack.LinkEndpoint, c io.Closer, err error) {
-	var fd int
-	fd, err = tun.Open(name)
-	if err != nil {
-		return
-	}
-
-	var mtu uint32
-	mtu, err = rawfile.GetMTU(name)
-	if err != nil {
-		return
-	}
-
-	ep, err = fdbased.New(&fdbased.Options{
-		FDs:            []int{fd},
-		MTU:            mtu,
-		EthernetHeader: false,
-	})
-
-	c = closeFunc(func() error {
-		return syscall.Close(fd)
-	})
-
-	return
-}

internal/dns/resolver.go

@@ -1,12 +0,0 @@
-package dns
-
-import (
-	"net"
-
-	"github.com/xjasonlyu/clash/component/dialer"
-)
-
-func init() { /* use bound dialer to resolve DNS */
-	net.DefaultResolver.PreferGo = true
-	net.DefaultResolver.Dial = dialer.DialContext
-}

internal/dns/server.go

@@ -1,107 +0,0 @@
-package dns
-
-import (
-	"errors"
-	"net/url"
-	"strings"
-
-	"github.com/xjasonlyu/clash/component/resolver"
-	"github.com/xjasonlyu/clash/dns"
-)
-
-const (
-	defaultScheme      = "dns"
-	defaultCacheSize   = 1000
-	defaultFakeIPRange = "198.18.0.0/15"
-)
-
-var _defaultNameServer = []string{"223.5.5.5", "8.8.8.8"}
-
-func Start(dnsURL string, rawHosts []string) error {
-	if !strings.Contains(dnsURL, "://") {
-		dnsURL = defaultScheme + "://" + dnsURL
-	}
-
-	u, err := url.Parse(dnsURL)
-	if err != nil {
-		return err
-	}
-
-	if strings.ToLower(u.Scheme) != defaultScheme {
-		return errors.New("unsupported scheme")
-	}
-
-	var serverAddr = u.Host
-
-	fakeIPRange := u.Query().Get("fake-ip-range")
-	if fakeIPRange == "" {
-		fakeIPRange = defaultFakeIPRange
-	}
-
-	var fakeIPFilter []string
-	if raw := strings.TrimSpace(u.Query().Get("fake-ip-filter")); raw != "" {
-		fakeIPFilter = append(fakeIPFilter, strings.Split(raw, ",")...)
-	}
-
-	pool, err := parseFakeIP(fakeIPRange, fakeIPFilter)
-	if err != nil {
-		return err
-	}
-
-	var mainNS, defaultNS []dns.NameServer
-	{
-		var ns []string
-		if raw := strings.TrimSpace(u.Query().Get("default-nameserver")); raw != "" {
-			ns = append(ns, strings.Split(raw, ",")...)
-		}
-
-		if len(ns) == 0 {
-			ns = append(ns, _defaultNameServer...)
-		}
-
-		if defaultNS, err = parseNameServer(ns); err != nil {
-			return err
-		}
-	}
-	{
-		var ns []string
-		if raw := strings.TrimSpace(u.Query().Get("nameserver")); raw != "" {
-			ns = append(ns, strings.Split(raw, ",")...)
-		}
-
-		if len(ns) == 0 {
-			ns = append(ns, _defaultNameServer...)
-		}
-
-		if mainNS, err = parseNameServer(ns); err != nil {
-			return err
-		}
-	}
-
-	hosts, err := parseHosts(parseHostsSlice(rawHosts))
-	if err != nil {
-		return err
-	}
-
-	cfg := dns.Config{
-		IPv6:         true,
-		Pool:         pool,
-		Hosts:        hosts,
-		Main:         mainNS,
-		Default:      defaultNS,
-		EnhancedMode: dns.FAKEIP,
-	}
-
-	r := dns.NewResolver(cfg)
-	m := dns.NewEnhancer(cfg)
-
-	// reuse cache of old host mapper
-	if old := resolver.DefaultHostMapper; old != nil {
-		m.PatchFrom(old.(*dns.ResolverEnhancer))
-	}
-
-	resolver.DefaultResolver = r
-	resolver.DefaultHostMapper = m
-
-	return dns.ReCreateServer(serverAddr, r, m)
-}

internal/dns/utils.go

@@ -1,141 +0,0 @@
-package dns
-
-import (
-	"fmt"
-	"net"
-	"net/url"
-	"strings"
-
-	"github.com/xjasonlyu/clash/component/fakeip"
-	"github.com/xjasonlyu/clash/component/trie"
-	"github.com/xjasonlyu/clash/dns"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
-)
-
-func parseFakeIP(fakeIPRange string, fakeIPFilter []string) (*fakeip.Pool, error) {
-	_, ipnet, err := net.ParseCIDR(fakeIPRange)
-	if err != nil {
-		return nil, err
-	}
-
-	var host *trie.DomainTrie
-	// fake ip skip host filter
-	if len(fakeIPFilter) != 0 {
-		host = trie.New()
-		for _, domain := range fakeIPFilter {
-			_ = host.Insert(domain, true)
-		}
-	}
-
-	return fakeip.New(ipnet, defaultCacheSize, host)
-}
-
-func parseHosts(hosts map[string]string) (*trie.DomainTrie, error) {
-	tree := trie.New()
-
-	// add default hosts
-	if err := tree.Insert("localhost", net.IP{127, 0, 0, 1}); err != nil {
-		log.Errorf("[DNS] insert localhost to host error: %v", err)
-	}
-
-	if len(hosts) != 0 {
-		for domain, ipStr := range hosts {
-			ip := net.ParseIP(ipStr)
-			if ip == nil {
-				return nil, fmt.Errorf("%s is not a valid IP", ipStr)
-			}
-			_ = tree.Insert(domain, ip)
-		}
-	}
-
-	return tree, nil
-}
-
-func parseHostsSlice(s []string) map[string]string {
-	m := make(map[string]string)
-
-	for _, i := range s {
-		if strings.Contains(i, "=") {
-			v := strings.SplitN(i, "=", 2)
-			m[v[0]] = v[1]
-			continue
-		}
-		if strings.Contains(i, ":") {
-			v := strings.SplitN(i, ":", 2)
-			m[v[0]] = v[1]
-			continue
-		}
-		log.Debugf("invalid hosts item: %s", i)
-	}
-
-	return m
-}
-
-func hostWithDefaultPort(host string, defPort string) (string, error) {
-	if !strings.Contains(host, ":") {
-		host += ":"
-	}
-
-	hostname, port, err := net.SplitHostPort(host)
-	if err != nil {
-		return "", err
-	}
-
-	if port == "" {
-		port = defPort
-	}
-
-	return net.JoinHostPort(hostname, port), nil
-}
-
-func parseNameServer(servers []string) ([]dns.NameServer, error) {
-	var nameservers []dns.NameServer
-
-	for idx, server := range servers {
-		server := strings.TrimSpace(server)
-		if server == "" {
-			return nil, fmt.Errorf("empty server field")
-		}
-
-		// parse without scheme .e.g 8.8.8.8:53
-		if !strings.Contains(server, "://") {
-			server = "udp://" + server
-		}
-		u, err := url.Parse(server)
-		if err != nil {
-			return nil, fmt.Errorf("DNS NameServer[%d] format: %s", idx, err.Error())
-		}
-
-		var addr, dnsNetType string
-		switch u.Scheme {
-		case "udp":
-			addr, err = hostWithDefaultPort(u.Host, "53")
-			dnsNetType = "" // UDP
-		case "tcp":
-			addr, err = hostWithDefaultPort(u.Host, "53")
-			dnsNetType = "tcp" // TCP
-		case "tls":
-			addr, err = hostWithDefaultPort(u.Host, "853")
-			dnsNetType = "tcp-tls" // DNS over TLS
-		case "https":
-			clearURL := url.URL{Scheme: "https", Host: u.Host, Path: u.Path}
-			addr = clearURL.String()
-			dnsNetType = "https" // DNS over HTTPS
-		default:
-			return nil, fmt.Errorf("DNS NameServer[%d] unsupport scheme: %s", idx, u.Scheme)
-		}
-
-		if err != nil {
-			return nil, fmt.Errorf("DNS NameServer[%d] format: %s", idx, err.Error())
-		}
-
-		nameservers = append(
-			nameservers,
-			dns.NameServer{
-				Net:  dnsNetType,
-				Addr: addr,
-			},
-		)
-	}
-	return nameservers, nil
-}

internal/proxy/base.go

@@ -1,50 +0,0 @@
-package proxy
-
-import (
-	"context"
-	"errors"
-	"net"
-	"net/url"
-	"strings"
-
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
-)
-
-type Base struct {
-	url *url.URL
-}
-
-func NewBase(url *url.URL) (*Base, error) {
-	return &Base{
-		url: url,
-	}, nil
-}
-
-func (b *Base) Type() string {
-	if b.url == nil {
-		return ""
-	}
-	return strings.ToLower(b.url.Scheme)
-}
-
-func (b *Base) Addr() string {
-	if b.url == nil {
-		return ""
-	}
-	return b.url.Host
-}
-
-func (b *Base) String() string {
-	if b.url == nil {
-		return ""
-	}
-	return b.url.String()
-}
-
-func (b *Base) DialContext(context.Context, *adapter.Metadata) (net.Conn, error) {
-	return nil, errors.New("no support")
-}
-
-func (b *Base) DialUDP(*adapter.Metadata) (net.PacketConn, error) {
-	return nil, errors.New("no support")
-}

internal/proxy/direct.go

@@ -1,57 +0,0 @@
-package proxy
-
-import (
-	"context"
-	"net"
-	"net/url"
-
-	"github.com/xjasonlyu/clash/component/dialer"
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
-)
-
-type Direct struct {
-	*Base
-}
-
-func NewDirect(url *url.URL) (*Direct, error) {
-	return &Direct{
-		Base: &Base{
-			url: url,
-		},
-	}, nil
-}
-
-func (d *Direct) DialContext(ctx context.Context, metadata *adapter.Metadata) (net.Conn, error) {
-	c, err := dialer.DialContext(ctx, "tcp", metadata.DestinationAddress())
-	if err != nil {
-		return nil, err
-	}
-	tcpKeepAlive(c)
-	return c, nil
-}
-
-func (d *Direct) DialUDP(_ *adapter.Metadata) (net.PacketConn, error) {
-	pc, err := dialer.ListenPacket("udp", "")
-	if err != nil {
-		return nil, err
-	}
-	return &directPacketConn{PacketConn: pc}, nil
-}
-
-type directPacketConn struct {
-	net.PacketConn
-}
-
-func (pc *directPacketConn) WriteTo(b []byte, addr net.Addr) (_ int, err error) {
-	var udpAddr *net.UDPAddr
-	if m, ok := addr.(*adapter.Metadata); ok && m.Host == "" {
-		udpAddr = m.UDPAddr()
-	} else {
-		udpAddr, err = resolveUDPAddr("udp", addr.String())
-	}
-
-	if err != nil {
-		return 0, err
-	}
-	return pc.PacketConn.WriteTo(b, udpAddr)
-}

internal/proxy/proxy.go

@@ -1,84 +0,0 @@
-package proxy
-
-import (
-	"context"
-	"fmt"
-	"net"
-	"net/url"
-	"strings"
-
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
-)
-
-type Dialer interface {
-	Addr() string
-	Type() string
-	String() string
-
-	DialContext(context.Context, *adapter.Metadata) (net.Conn, error)
-	DialUDP(*adapter.Metadata) (net.PacketConn, error)
-}
-
-var _defaultDialer Dialer = &Base{}
-
-// New returns proxy dialer.
-func New(proxyURL string) (Dialer, error) {
-	u, err := url.Parse(proxyURL)
-	if err != nil {
-		return nil, err
-	}
-
-	proto := strings.ToLower(u.Scheme)
-	user := u.User.Username()
-	pass, _ := u.User.Password()
-
-	switch proto {
-	case "direct":
-		return NewDirect(u)
-	case "socks5":
-		return NewSocks5(u, user, pass)
-	case "ss", "shadowsocks":
-		method, password := user, pass
-		return NewShadowSocks(u, method, password)
-	}
-
-	return nil, fmt.Errorf("unsupported protocol: %s", proto)
-}
-
-// Register updates the _defaultDialer.
-func Register(proxyURL string) error {
-	dialer, err := New(proxyURL)
-	if err != nil {
-		return err
-	}
-
-	_defaultDialer = dialer
-	return nil
-}
-
-// Dial uses _defaultDialer to dial TCP.
-func Dial(metadata *adapter.Metadata) (net.Conn, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), tcpConnectTimeout)
-	defer cancel()
-	return _defaultDialer.DialContext(ctx, metadata)
-}
-
-// DialUDP uses _defaultDialer to dial UDP.
-func DialUDP(metadata *adapter.Metadata) (net.PacketConn, error) {
-	return _defaultDialer.DialUDP(metadata)
-}
-
-// Addr returns _defaultDialer addr.
-func Addr() string {
-	return _defaultDialer.Addr()
-}
-
-// Type returns _defaultDialer type.
-func Type() string {
-	return _defaultDialer.Type()
-}
-
-// String returns _defaultDialer URL.
-func String() string {
-	return _defaultDialer.String()
-}

internal/proxy/utils.go

@@ -1,33 +0,0 @@
-package proxy
-
-import (
-	"net"
-	"time"
-
-	"github.com/xjasonlyu/clash/component/resolver"
-)
-
-const (
-	tcpConnectTimeout  = 5 * time.Second
-	tcpKeepAlivePeriod = 30 * time.Second
-)
-
-func tcpKeepAlive(c net.Conn) {
-	if tcp, ok := c.(*net.TCPConn); ok {
-		tcp.SetKeepAlive(true)
-		tcp.SetKeepAlivePeriod(tcpKeepAlivePeriod)
-	}
-}
-
-func resolveUDPAddr(network, address string) (*net.UDPAddr, error) {
-	host, port, err := net.SplitHostPort(address)
-	if err != nil {
-		return nil, err
-	}
-
-	ip, err := resolver.ResolveIP(host)
-	if err != nil {
-		return nil, err
-	}
-	return net.ResolveUDPAddr(network, net.JoinHostPort(ip.String(), port))
-}

internal/tunnel/tunnel.go

@@ -1,67 +0,0 @@
-package tunnel
-
-import (
-	"runtime"
-
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
-)
-
-const (
-	// maxUDPQueueSize is the max number of UDP packets
-	// could be buffered. if queue is full, upcoming packets
-	// would be dropped util queue is ready again.
-	maxUDPQueueSize = 2 << 10
-)
-
-var (
-	numUDPWorkers = max(runtime.NumCPU(), 4 /* at least 4 workers */)
-
-	tcpQueue      = make(chan adapter.TCPConn) /* unbuffered */
-	udpMultiQueue = make([]chan adapter.UDPPacket, 0, numUDPWorkers)
-)
-
-func init() {
-	for i := 0; i < numUDPWorkers; i++ {
-		udpMultiQueue = append(udpMultiQueue, make(chan adapter.UDPPacket, maxUDPQueueSize))
-	}
-
-	go process()
-}
-
-// Add adds tcpConn to tcpQueue.
-func Add(conn adapter.TCPConn) {
-	tcpQueue <- conn
-}
-
-// AddPacket adds udpPacket to udpQueue.
-func AddPacket(packet adapter.UDPPacket) {
-	m := packet.Metadata()
-	// In order to keep each packet sent in order, we
-	// calculate which queue each packet should be sent
-	// by src/dst info, and make sure the rest of them
-	// would only be sent to the same queue.
-	i := int(m.SrcPort+m.DstPort) % numUDPWorkers
-
-	select {
-	case udpMultiQueue[i] <- packet:
-	default:
-		log.Warnf("queue is currently full, packet will be dropped")
-		packet.Drop()
-	}
-}
-
-func process() {
-	for _, udpQueue := range udpMultiQueue {
-		queue := udpQueue
-		go func() {
-			for packet := range queue {
-				handleUDP(packet)
-			}
-		}()
-	}
-
-	for conn := range tcpQueue {
-		go handleTCP(conn)
-	}
-}

internal/tunnel/udp.go

@@ -1,150 +0,0 @@
-package tunnel
-
-import (
-	"errors"
-	"net"
-	"os"
-	"strconv"
-	"time"
-
-	"github.com/xjasonlyu/clash/common/pool"
-	"github.com/xjasonlyu/clash/component/resolver"
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
-	"github.com/xjasonlyu/tun2socks/internal/manager"
-	"github.com/xjasonlyu/tun2socks/internal/proxy"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
-	"github.com/xjasonlyu/tun2socks/pkg/nat"
-)
-
-const (
-	udpTimeout    = 30 * time.Second
-	udpBufferSize = 64 << 10 // KiB
-)
-
-var (
-	// natTable uses source udp packet information
-	// as key to store destination udp packetConn.
-	natTable = nat.NewTable()
-)
-
-func handleUDP(packet adapter.UDPPacket) {
-	metadata := packet.Metadata()
-	if !metadata.Valid() {
-		log.Warnf("[Metadata] not valid: %#v", metadata)
-		return
-	}
-
-	// make a fAddr if request ip is fake ip.
-	var fAddr net.Addr
-	if resolver.IsExistFakeIP(metadata.DstIP) {
-		fAddr = metadata.UDPAddr()
-	}
-
-	err := resolveMetadata(metadata)
-	if err != nil {
-		log.Warnf("[Metadata] resolve metadata error: %v", err)
-		return
-	}
-
-	key := generateNATKey(metadata)
-
-	handle := func(drop bool) bool {
-		pc := natTable.Get(key)
-		if pc != nil {
-			handleUDPToRemote(packet, pc, metadata /* as net.Addr */, drop)
-			return true
-		}
-		return false
-	}
-
-	if handle(true /* drop */) {
-		return
-	}
-
-	lockKey := key + "-lock"
-	cond, loaded := natTable.GetOrCreateLock(lockKey)
-	go func() {
-		if loaded {
-			cond.L.Lock()
-			cond.Wait()
-			handle(true) /* drop after sending data to remote */
-			cond.L.Unlock()
-			return
-		}
-
-		defer func() {
-			natTable.Delete(lockKey)
-			cond.Broadcast()
-		}()
-
-		pc, err := proxy.DialUDP(metadata)
-		if err != nil {
-			log.Warnf("[UDP] dial %s error: %v", metadata.DestinationAddress(), err)
-			return
-		}
-
-		if dialerAddr, ok := pc.LocalAddr().(*net.UDPAddr); ok {
-			metadata.MidIP = dialerAddr.IP
-			metadata.MidPort = uint16(dialerAddr.Port)
-		} else {
-			ip, p, _ := net.SplitHostPort(pc.LocalAddr().String())
-			port, _ := strconv.ParseUint(p, 10, 16)
-			metadata.MidIP = net.ParseIP(ip)
-			metadata.MidPort = uint16(port)
-		}
-
-		pc = manager.NewUDPTracker(pc, metadata)
-
-		go func() {
-			defer pc.Close()
-			defer packet.Drop()
-			defer natTable.Delete(key)
-
-			handleUDPToLocal(packet, pc, fAddr, udpTimeout)
-		}()
-
-		natTable.Set(key, pc)
-		handle(false /* drop */)
-	}()
-}
-
-func handleUDPToRemote(packet adapter.UDPPacket, pc net.PacketConn, remote net.Addr, drop bool) {
-	defer func() {
-		if drop {
-			packet.Drop()
-		}
-	}()
-
-	if _, err := pc.WriteTo(packet.Data() /* data */, remote); err != nil {
-		log.Warnf("[UDP] write to %s error: %v", remote, err)
-	}
-
-	log.Infof("[UDP] %s --> %s", packet.RemoteAddr(), remote)
-}
-
-func handleUDPToLocal(packet adapter.UDPPacket, pc net.PacketConn, fAddr net.Addr, timeout time.Duration) {
-	buf := pool.Get(udpBufferSize)
-	defer pool.Put(buf)
-
-	for /* just loop */ {
-		pc.SetReadDeadline(time.Now().Add(timeout))
-		n, from, err := pc.ReadFrom(buf)
-		if err != nil {
-			if !errors.Is(err, os.ErrDeadlineExceeded) /* ignore i/o timeout */ {
-				log.Warnf("[UDP] ReadFrom error: %v", err)
-			}
-			return
-		}
-
-		if fAddr != nil {
-			from = fAddr
-		}
-
-		if _, err := packet.WriteBack(buf[:n], from); err != nil {
-			log.Warnf("[UDP] write back from %s error: %v", from, err)
-			return
-		}
-
-		log.Infof("[UDP] %s <-- %s", packet.RemoteAddr(), from)
-	}
-}

internal/tunnel/utils.go

@@ -1,35 +0,0 @@
-package tunnel
-
-import (
-	"fmt"
-
-	"github.com/xjasonlyu/clash/component/resolver"
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
-)
-
-func generateNATKey(m *adapter.Metadata) string {
-	return m.SourceAddress() /* Full Cone NAT Key */
-}
-
-func max(a, b int) int {
-	if a > b {
-		return a
-	}
-	return b
-}
-
-func resolveMetadata(metadata *adapter.Metadata) error {
-	if metadata.DstIP == nil {
-		return fmt.Errorf("destination IP is nil")
-	}
-
-	if resolver.IsFakeIP(metadata.DstIP) {
-		var exist bool
-		metadata.Host, exist = resolver.FindHostByIP(metadata.DstIP)
-		if !exist {
-			return fmt.Errorf("fake DNS record %s missing", metadata.DstIP)
-		}
-	}
-
-	return nil
-}

log/event.go

@@ -4,12 +4,12 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/xjasonlyu/clash/common/observable"
+	"github.com/xjasonlyu/tun2socks/common/observable"
 )
 
 var (
-	logCh  = make(chan interface{})
-	source = observable.NewObservable(logCh)
+	_logCh  = make(chan interface{})
+	_source = observable.NewObservable(_logCh)
 )
 
 type Event struct {
@@ -24,16 +24,16 @@ func newEvent(level Level, format string, args ...interface{}) *Event {
 		Time:    time.Now(),
 		Message: fmt.Sprintf(format, args...),
 	}
-	logCh <- event /* send all events to logCh */
+	_logCh <- event /* send all events to logCh */
 
 	return event
 }
 
 func Subscribe() observable.Subscription {
-	sub, _ := source.Subscribe()
+	sub, _ := _source.Subscribe()
 	return sub
 }
 
 func UnSubscribe(sub observable.Subscription) {
-	source.UnSubscribe(sub)
+	_source.UnSubscribe(sub)
 }

log/level.go

@@ -10,7 +10,6 @@ type Level uint32
 
 const (
 	SilentLevel Level = iota
-	FatalLevel
 	ErrorLevel
 	WarnLevel
 	InfoLevel
@@ -48,8 +47,6 @@ func (level Level) String() string {
 		return "warning"
 	case ErrorLevel:
 		return "error"
-	case FatalLevel:
-		return "fatal"
 	case SilentLevel:
 		return "silent"
 	default:
@@ -59,13 +56,11 @@ func (level Level) String() string {
 
 func ParseLevel(lvl string) (Level, error) {
 	switch strings.ToLower(lvl) {
-	case "silent", "none":
+	case "silent":
 		return SilentLevel, nil
-	case "fatal":
-		return FatalLevel, nil
 	case "error":
 		return ErrorLevel, nil
-	case "warn", "warning":
+	case "warn":
 		return WarnLevel, nil
 	case "info":
 		return InfoLevel, nil

log/log.go

@@ -2,14 +2,14 @@ package log
 
 import (
 	"os"
-	"sync/atomic"
 
 	"github.com/sirupsen/logrus"
+	"go.uber.org/atomic"
 )
 
 var (
-	// defaultLevel is package default loglevel.
-	defaultLevel = InfoLevel
+	// _defaultLevel is package default logging level.
+	_defaultLevel = atomic.NewUint32(uint32(InfoLevel))
 )
 
 func init() {
@@ -18,7 +18,7 @@ func init() {
 }
 
 func SetLevel(level Level) {
-	atomic.StoreUint32((*uint32)(&defaultLevel), uint32(level))
+	_defaultLevel.Store(uint32(level))
 }
 
 func Debugf(format string, args ...interface{}) {
@@ -43,7 +43,7 @@ func Fatalf(format string, args ...interface{}) {
 
 func logf(level Level, format string, args ...interface{}) {
 	event := newEvent(level, format, args...)
-	if event.Level > defaultLevel {
+	if uint32(event.Level) > _defaultLevel.Load() {
 		return
 	}
 

main.go

@@ -1,43 +1,44 @@
 package main
 
 import (
+	"flag"
 	"os"
-	"time"
+	"os/signal"
+	"syscall"
 
-	"github.com/urfave/cli/v2"
-
-	"github.com/xjasonlyu/tun2socks/internal/cmd"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
+	"github.com/xjasonlyu/tun2socks/engine"
+	"github.com/xjasonlyu/tun2socks/log"
 )
 
-const Usage = "A tun2socks implementation written in Go."
+var key = new(engine.Key)
 
-var (
-	Version   string
-	BuildTime string
-)
+func init() {
+	flag.IntVar(&key.Mark, "fwmark", 0, "Set firewall MARK (Linux only)")
+	flag.IntVar(&key.MTU, "mtu", 0, "Set device maximum transmission unit (MTU)")
+	flag.IntVar(&key.UDPTimeout, "udp-timeout", 0, "Set timeout for each UDP session")
+	flag.BoolVar(&key.Version, "version", false, "Show version information and quit")
+	flag.StringVar(&key.Device, "device", "", "Use this device [driver://]name")
+	flag.StringVar(&key.Interface, "interface", "", "Use network INTERFACE (Linux/MacOS only)")
+	flag.StringVar(&key.LogLevel, "loglevel", "info", "Log level [debug|info|warn|error|silent]")
+	flag.StringVar(&key.Proxy, "proxy", "", "Use this proxy [protocol://]host[:port]")
+	flag.StringVar(&key.Stats, "stats", "", "HTTP statistic server listen address")
+	flag.StringVar(&key.Token, "token", "", "HTTP statistic server auth token")
+	flag.Parse()
+}
 
 func main() {
-	app := &cli.App{
-		Usage:   Usage,
-		Version: Version,
-		Action:  cmd.Main,
-		Flags: []cli.Flag{
-			&cmd.API,
-			&cmd.Device,
-			&cmd.DNS,
-			&cmd.Hosts,
-			&cmd.Interface,
-			&cmd.LogLevel,
-			&cmd.Proxy,
-			&cmd.Version,
-		},
-		HideVersion:     true,
-		HideHelpCommand: true,
-	}
-	app.Compiled, _ = time.Parse(time.RFC3339, BuildTime)
+	engine.Insert(key)
 
-	if err := app.Run(os.Args); err != nil {
-		log.Fatalf("Failed to start: %v", err)
+	checkErr := func(msg string, f func() error) {
+		if err := f(); err != nil {
+			log.Fatalf("Failed to %s: %v", msg, err)
+		}
 	}
+
+	checkErr("start engine", engine.Start)
+	defer checkErr("stop engine", engine.Stop)
+
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+	<-sigCh
 }

proxy/base.go

@@ -0,0 +1,33 @@
+package proxy
+
+import (
+	"context"
+	"errors"
+	"net"
+
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+)
+
+var _ Proxy = (*Base)(nil)
+
+type Base struct {
+	addr  string
+	proto proto.Proto
+}
+
+func (b *Base) Addr() string {
+	return b.addr
+}
+
+func (b *Base) Proto() proto.Proto {
+	return b.proto
+}
+
+func (b *Base) DialContext(context.Context, *M.Metadata) (net.Conn, error) {
+	return nil, errors.New("not supported")
+}
+
+func (b *Base) DialUDP(*M.Metadata) (net.PacketConn, error) {
+	return nil, errors.New("not supported")
+}

proxy/direct.go

@@ -0,0 +1,57 @@
+package proxy
+
+import (
+	"context"
+	"net"
+
+	"github.com/xjasonlyu/tun2socks/component/dialer"
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+)
+
+var _ Proxy = (*Direct)(nil)
+
+type Direct struct {
+	*Base
+}
+
+func NewDirect() *Direct {
+	return &Direct{
+		Base: &Base{
+			proto: proto.Direct,
+		},
+	}
+}
+
+func (d *Direct) DialContext(ctx context.Context, metadata *M.Metadata) (net.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", metadata.DestinationAddress())
+	if err != nil {
+		return nil, err
+	}
+	setKeepAlive(c)
+	return c, nil
+}
+
+func (d *Direct) DialUDP(*M.Metadata) (net.PacketConn, error) {
+	pc, err := dialer.ListenPacket("udp", "")
+	if err != nil {
+		return nil, err
+	}
+	return &directPacketConn{PacketConn: pc}, nil
+}
+
+type directPacketConn struct {
+	net.PacketConn
+}
+
+func (pc *directPacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	if m, ok := addr.(*M.Metadata); ok && m.DstIP != nil {
+		return pc.PacketConn.WriteTo(b, m.UDPAddr())
+	}
+
+	udpAddr, err := net.ResolveUDPAddr("udp", addr.String())
+	if err != nil {
+		return 0, err
+	}
+	return pc.PacketConn.WriteTo(b, udpAddr)
+}

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

@@ -0,0 +1,33 @@
+package proto
+
+import "fmt"
+
+const (
+	Direct Proto = iota
+	Reject
+	HTTP
+	Socks4
+	Socks5
+	Shadowsocks
+)
+
+type Proto uint8
+
+func (proto Proto) String() string {
+	switch proto {
+	case Direct:
+		return "direct"
+	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/proxy.go

@@ -0,0 +1,52 @@
+// Package proxy provides implementations of proxy protocols.
+package proxy
+
+import (
+	"context"
+	"net"
+	"time"
+
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+)
+
+const (
+	tcpConnectTimeout = 5 * time.Second
+)
+
+var (
+	_defaultDialer Dialer = &Base{}
+)
+
+type Dialer interface {
+	DialContext(context.Context, *M.Metadata) (net.Conn, error)
+	DialUDP(*M.Metadata) (net.PacketConn, error)
+}
+
+type Proxy interface {
+	Dialer
+	Addr() string
+	Proto() proto.Proto
+}
+
+// SetDialer sets default Dialer.
+func SetDialer(d Dialer) {
+	_defaultDialer = d
+}
+
+// Dial uses default Dialer to dial TCP.
+func Dial(metadata *M.Metadata) (net.Conn, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), tcpConnectTimeout)
+	defer cancel()
+	return _defaultDialer.DialContext(ctx, metadata)
+}
+
+// DialContext uses default Dialer to dial TCP with context.
+func DialContext(ctx context.Context, metadata *M.Metadata) (net.Conn, error) {
+	return _defaultDialer.DialContext(ctx, metadata)
+}
+
+// DialUDP uses default Dialer to dial UDP.
+func DialUDP(metadata *M.Metadata) (net.PacketConn, error) {
+	return _defaultDialer.DialUDP(metadata)
+}

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

@@ -5,62 +5,75 @@ import (
 	"errors"
 	"fmt"
 	"net"
-	"net/url"
+
+	"github.com/xjasonlyu/tun2socks/component/dialer"
+	obfs "github.com/xjasonlyu/tun2socks/component/simple-obfs"
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+	"github.com/xjasonlyu/tun2socks/transport/socks5"
 
 	"github.com/Dreamacro/go-shadowsocks2/core"
-
-	"github.com/xjasonlyu/clash/component/dialer"
-	"github.com/xjasonlyu/clash/component/socks5"
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
 )
 
-type ShadowSocks struct {
+var _ Proxy = (*Shadowsocks)(nil)
+
+type Shadowsocks struct {
 	*Base
 
 	cipher core.Cipher
+
+	// simple-obfs plugin
+	obfsMode, obfsHost string
 }
 
-func NewShadowSocks(url *url.URL, method, password string) (*ShadowSocks, error) {
+func NewShadowsocks(addr, method, password, obfsMode, obfsHost string) (*Shadowsocks, error) {
 	cipher, err := core.PickCipher(method, nil, password)
 	if err != nil {
 		return nil, fmt.Errorf("ss initialize: %w", err)
 	}
 
-	return &ShadowSocks{
+	return &Shadowsocks{
 		Base: &Base{
-			url: url,
+			addr:  addr,
+			proto: proto.Shadowsocks,
 		},
-		cipher: cipher,
+		cipher:   cipher,
+		obfsMode: obfsMode,
+		obfsHost: obfsHost,
 	}, nil
 }
 
-func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *adapter.Metadata) (c net.Conn, err error) {
+func (ss *Shadowsocks) 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)
 	}
-	tcpKeepAlive(c)
+	setKeepAlive(c)
 
-	defer func() {
-		if err != nil {
-			c.Close()
-		}
-	}()
+	defer safeConnClose(c, err)
+
+	switch ss.obfsMode {
+	case "tls":
+		c = obfs.NewTLSObfs(c, ss.obfsHost)
+	case "http":
+		_, port, _ := net.SplitHostPort(ss.addr)
+		c = obfs.NewHTTPObfs(c, ss.obfsHost, port)
+	}
 
 	c = ss.cipher.StreamConn(c)
 	_, err = c.Write(metadata.SerializesSocksAddr())
 	return
 }
 
-func (ss *ShadowSocks) DialUDP(_ *adapter.Metadata) (net.PacketConn, error) {
+func (ss *Shadowsocks) DialUDP(*M.Metadata) (net.PacketConn, error) {
 	pc, err := dialer.ListenPacket("udp", "")
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("listen packet: %w", err)
 	}
 
-	udpAddr, err := resolveUDPAddr("udp", ss.Addr())
+	udpAddr, err := net.ResolveUDPAddr("udp", ss.Addr())
 	if err != nil {
-		return nil, fmt.Errorf("resolve UDPAddr %s failed", ss.Addr())
+		return nil, fmt.Errorf("resolve udp address %s: %w", ss.Addr(), err)
 	}
 
 	pc = ss.cipher.PacketConn(pc)
@@ -75,7 +88,7 @@ type ssPacketConn struct {
 
 func (pc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
 	var packet []byte
-	if m, ok := addr.(*adapter.Metadata); ok {
+	if m, ok := addr.(*M.Metadata); ok {
 		packet, err = socks5.EncodeUDPPacket(m.SerializesSocksAddr(), b)
 	} else {
 		packet, err = socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
@@ -88,9 +101,9 @@ func (pc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
 }
 
 func (pc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, _, e := pc.PacketConn.ReadFrom(b)
-	if e != nil {
-		return 0, nil, e
+	n, _, err := pc.PacketConn.ReadFrom(b)
+	if err != nil {
+		return 0, nil, err
 	}
 
 	addr := socks5.SplitAddr(b[:n])
@@ -104,5 +117,5 @@ func (pc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	}
 
 	copy(b, b[len(addr):])
-	return n - len(addr), udpAddr, e
+	return n - len(addr), udpAddr, err
 }

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

@@ -2,46 +2,54 @@ package proxy
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
-	"net/url"
 
-	"github.com/xjasonlyu/clash/component/dialer"
-	"github.com/xjasonlyu/clash/component/socks5"
-	"github.com/xjasonlyu/tun2socks/internal/adapter"
+	"github.com/xjasonlyu/tun2socks/component/dialer"
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+	"github.com/xjasonlyu/tun2socks/transport/socks5"
 )
 
+var _ Proxy = (*Socks5)(nil)
+
 type Socks5 struct {
 	*Base
 
 	user string
 	pass string
+
+	// unix indicates if socks5 over UDS is enabled.
+	unix bool
 }
 
-func NewSocks5(url *url.URL, user, pass string) (*Socks5, error) {
+func NewSocks5(addr, user, pass string) (*Socks5, error) {
 	return &Socks5{
 		Base: &Base{
-			url: url,
+			addr:  addr,
+			proto: proto.Socks5,
 		},
 		user: user,
 		pass: pass,
+		unix: len(addr) > 0 && addr[0] == '/',
 	}, nil
 }
 
-func (ss *Socks5) DialContext(ctx context.Context, metadata *adapter.Metadata) (c net.Conn, err error) {
-	c, err = dialer.DialContext(ctx, "tcp", ss.Addr())
+func (ss *Socks5) DialContext(ctx context.Context, metadata *M.Metadata) (c net.Conn, err error) {
+	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)
 	}
-	tcpKeepAlive(c)
+	setKeepAlive(c)
 
-	defer func() {
-		if err != nil {
-			c.Close()
-		}
-	}()
+	defer safeConnClose(c, err)
 
 	var user *socks5.User
 	if ss.user != "" {
@@ -51,25 +59,27 @@ func (ss *Socks5) DialContext(ctx context.Context, metadata *adapter.Metadata) (
 		}
 	}
 
-	if _, err := socks5.ClientHandshake(c, metadata.SerializesSocksAddr(), socks5.CmdConnect, user); err != nil {
-		return nil, fmt.Errorf("client hanshake: %w", err)
-	}
-
+	_, err = socks5.ClientHandshake(c, metadata.SerializesSocksAddr(), socks5.CmdConnect, user)
 	return
 }
 
-func (ss *Socks5) DialUDP(_ *adapter.Metadata) (_ net.PacketConn, err error) {
+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()
+
 	c, err := dialer.DialContext(ctx, "tcp", ss.Addr())
 	if err != nil {
 		err = fmt.Errorf("connect to %s: %w", ss.Addr(), err)
 		return
 	}
-	tcpKeepAlive(c)
+	setKeepAlive(c)
 
 	defer func() {
-		if err != nil {
+		if err != nil && c != nil {
 			c.Close()
 		}
 	}()
@@ -92,25 +102,34 @@ func (ss *Socks5) DialUDP(_ *adapter.Metadata) (_ net.PacketConn, err error) {
 	// zeros. RFC1928
 	var targetAddr socks5.Addr = []byte{socks5.AtypIPv4, 0, 0, 0, 0, 0, 0}
 
-	bindAddr, err := socks5.ClientHandshake(c, targetAddr, socks5.CmdUDPAssociate, user)
+	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", "")
 	if err != nil {
-		return
+		return nil, fmt.Errorf("listen packet: %w", err)
 	}
 
 	go func() {
-		io.Copy(ioutil.Discard, c)
+		io.Copy(io.Discard, c)
 		c.Close()
 		// A UDP association terminates when the TCP connection that the UDP
 		// ASSOCIATE request arrived on terminates. RFC1928
 		pc.Close()
 	}()
 
-	return &socksPacketConn{PacketConn: pc, rAddr: bindAddr.UDPAddr(), tcpConn: c}, nil
+	bindAddr := addr.UDPAddr()
+	if bindAddr.IP.IsUnspecified() { /* e.g. "0.0.0.0" or "::" */
+		udpAddr, err := net.ResolveUDPAddr("udp", ss.Addr())
+		if err != nil {
+			return nil, fmt.Errorf("resolve udp address %s: %w", ss.Addr(), err)
+		}
+		bindAddr.IP = udpAddr.IP
+	}
+
+	return &socksPacketConn{PacketConn: pc, rAddr: bindAddr, tcpConn: c}, nil
 }
 
 type socksPacketConn struct {
@@ -122,7 +141,7 @@ type socksPacketConn struct {
 
 func (pc *socksPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
 	var packet []byte
-	if m, ok := addr.(*adapter.Metadata); ok {
+	if m, ok := addr.(*M.Metadata); ok {
 		packet, err = socks5.EncodeUDPPacket(m.SerializesSocksAddr(), b)
 	} else {
 		packet, err = socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
@@ -135,10 +154,11 @@ func (pc *socksPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
 }
 
 func (pc *socksPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, _, e := pc.PacketConn.ReadFrom(b)
-	if e != nil {
-		return 0, nil, e
+	n, _, err := pc.PacketConn.ReadFrom(b)
+	if err != nil {
+		return 0, nil, err
 	}
+
 	addr, payload, err := socks5.DecodeUDPPacket(b)
 	if err != nil {
 		return 0, nil, err
@@ -146,7 +166,7 @@ func (pc *socksPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
 
 	udpAddr := addr.UDPAddr()
 	if udpAddr == nil {
-		return 0, nil, fmt.Errorf("convert %s to UDPAddr failed", addr)
+		return 0, nil, fmt.Errorf("convert %s to UDPAddr is nil", addr)
 	}
 
 	// due to DecodeUDPPacket is mutable, record addr length

proxy/util.go

@@ -0,0 +1,25 @@
+package proxy
+
+import (
+	"net"
+	"time"
+)
+
+const (
+	tcpKeepAlivePeriod = 30 * time.Second
+)
+
+// setKeepAlive sets tcp keepalive option for tcp connection.
+func setKeepAlive(c net.Conn) {
+	if tcp, ok := c.(*net.TCPConn); ok {
+		tcp.SetKeepAlive(true)
+		tcp.SetKeepAlivePeriod(tcpKeepAlivePeriod)
+	}
+}
+
+// safeConnClose closes tcp connection safely.
+func safeConnClose(c net.Conn, err error) {
+	if c != nil && err != nil {
+		c.Close()
+	}
+}