Chore: update README

Chore: adapt fwmark option
Feature: add fwmark support
2024-12-30 02:37:01 +00:00 · 2021-02-10 16:55:31 +08:00 · 2021-02-10 16:40:36 +08:00 · 2021-02-10 15:46:55 +08:00 · 2021-02-10 13:11:11 +08:00 · 2021-02-09 14:16:55 +08:00
104 changed files with 4527 additions and 2057 deletions
@@ -0,0 +1,6 @@
+.github
+.gitignore
+
+# Other
+bin/*
+docs/*
@@ -3,12 +3,12 @@ name: Publish Docker Image
 on:
  push:
    branches:
-      - master
+      - dev
+    tags:
+      - '*'
    paths-ignore:
-      - '.github/**'
-      - 'assets/**'
-      - '.gitignore'
-      - 'README.md'
+      - 'docs/**'
+      - '**.md'

 jobs:

@@ -19,12 +19,18 @@ jobs:

      - 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
@@ -32,17 +38,38 @@ jobs:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

-      - name: Get Version
-        id: version
-        uses: oprypin/find-latest-tag@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
        with:
-          repository: xjasonlyu/tun2socks
+          registry: ghcr.io
+          username: xjasonlyu
+          password: ${{ secrets.CR_PAT }}

-      - name: Build and Push
+      - name: Build and Push (dev)
+        if: github.ref == 'refs/heads/dev'
        uses: docker/build-push-action@v2
        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            xjasonlyu/tun2socks:dev
+            ghcr.io/xjasonlyu/tun2socks:dev
+
+      - name: Get Version
+        id: shell
+        run: |
+          echo ::set-output name=version::$(git describe --tags --abbrev=0)
+
+      - name: Build and Push (latest)
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: docker/build-push-action@v2
+        with:
+          context: .
          push: true
          platforms: linux/amd64,linux/arm64
          tags: |
            xjasonlyu/tun2socks:latest
-            xjasonlyu/tun2socks:${{ steps.version.outputs.tag }}
+            xjasonlyu/tun2socks:${{ steps.shell.outputs.version }}
+            ghcr.io/xjasonlyu/tun2socks:latest
+            ghcr.io/xjasonlyu/tun2socks:${{ steps.shell.outputs.version }}
@@ -1,19 +1,17 @@
 name: Go

 on:
+  pull_request:
  push:
    branches:
-      - master
+      - dev
    tags:
      - '*'
    paths-ignore:
-      - '.github/**'
-      - 'assets/**'
-      - '.gitignore'
-      - 'README.md'
+      - 'docs/**'
+      - '**.md'

 jobs:
-
  build:
    name: Build
    runs-on: ubuntu-latest
@@ -25,6 +23,8 @@ jobs:

      - name: Check out code into the Go module directory
        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0

      - name: Cache go module
        uses: actions/cache@v2
@@ -43,9 +43,6 @@ jobs:

      - name: Build
        if: startsWith(github.ref, 'refs/tags/')
-        env:
-          DIR: bin
-          NAME: tun2socks
        run: make -j releases

      - name: Upload Release
@@ -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
@@ -1,6 +1,14 @@
-
-.idea/
-.vscode/
+# Binaries
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
 bin/

+# IDE
+.idea/
+.vscode/
+
+# Misc
 .DS_Store
@@ -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 ./bin/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 TUN_ADDR=198.18.0.1/15
+ENV LOGLEVEL=info
+ENV PROXY=direct://
+ENV MTU=9000
+ENV STATS=
+ENV TOKEN=
+ENV EXTRA_COMMANDS=
+ENV TUN_INCLUDED_ROUTES=
+ENV TUN_EXCLUDED_ROUTES=

 ENTRYPOINT ["/entrypoint.sh"]
@@ -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.

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+    Copyright (C) <year>  <name of author>
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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.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
@@ -1,44 +1,71 @@
-DIR = "bin"
-NAME = "tun2socks"
+BINDIR = "bin"
+NAME   = "tun2socks"

-TAGS = ""
-BUILD_FLAGS = "-v"
-
-VERSION = $(shell git describe --tags --abbrev=0)
-BUILD_TIME = $(shell date -u '+%FT%TZ')
+BUILD_FLAGS   = "-v"
+BUILD_TAGS    = ""
+BUILD_TIME    = $(shell date -u '+%FT%TZ')
+BUILD_VERSION = $(shell git describe --tags)

 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 '$(TAGS)' -trimpath
+LDFLAGS += -X "github.com/xjasonlyu/tun2socks/constant.Version=$(BUILD_VERSION)"
+LDFLAGS += -X "github.com/xjasonlyu/tun2socks/constant.BuildTime=$(BUILD_TIME)"  # RFC3339
+
+GO_BUILD = GO111MODULE=on CGO_ENABLED=0 go build $(BUILD_FLAGS) -ldflags '$(LDFLAGS)' -tags '$(BUILD_TAGS)' -trimpath

 PLATFORM_LIST = \
 	darwin-amd64 \
+	freebsd-amd64 \
+	freebsd-arm64 \
 	linux-amd64 \
 	linux-arm64 \
+	openbsd-amd64 \
+	openbsd-arm64 \

-.PHONY: all docker $(PLATFORM_LIST)
+WINDOWS_ARCH_LIST = \
+	windows-amd64 \

-all: $(PLATFORM_LIST)
+all: linux-amd64 darwin-amd64 windows-amd64

-docker:
-	$(GO_BUILD) -o $(DIR)/$(NAME)-$@
+tun2socks:
+	$(GO_BUILD) -o $(BINDIR)/$(NAME)

 darwin-amd64:
-	GOARCH=amd64 GOOS=darwin $(GO_BUILD) -o $(DIR)/$(NAME)-$@
+	GOARCH=amd64 GOOS=darwin $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@
+
+freebsd-amd64:
+	GOARCH=amd64 GOOS=freebsd $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@
+
+freebsd-arm64:
+	GOARCH=arm64 GOOS=freebsd $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@

 linux-amd64:
-	GOARCH=amd64 GOOS=linux $(GO_BUILD) -o $(DIR)/$(NAME)-$@
+	GOARCH=amd64 GOOS=linux $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@

 linux-arm64:
-	GOARCH=arm64 GOOS=linux $(GO_BUILD) -o $(DIR)/$(NAME)-$@
+	GOARCH=arm64 GOOS=linux $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@

-zip_releases=$(addsuffix .zip, $(PLATFORM_LIST))
+openbsd-amd64:
+	GOARCH=amd64 GOOS=openbsd $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@
+
+openbsd-arm64:
+	GOARCH=arm64 GOOS=openbsd $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@
+
+windows-amd64:
+	GOARCH=amd64 GOOS=windows $(GO_BUILD) -o $(BINDIR)/$(NAME)-$@.exe
+
+gz_releases=$(addsuffix .gz, $(PLATFORM_LIST))
+zip_releases=$(addsuffix .zip, $(WINDOWS_ARCH_LIST))
+
+$(gz_releases): %.gz : %
+	chmod +x $(BINDIR)/$(NAME)-$(basename $@)
+	gzip -f -S .gz $(BINDIR)/$(NAME)-$(basename $@)

 $(zip_releases): %.zip : %
-	zip -m -j $(DIR)/$(NAME)-$(basename $@).zip $(DIR)/$(NAME)-$(basename $@)
+	zip -m -j $(BINDIR)/$(NAME)-$(basename $@).zip $(BINDIR)/$(NAME)-$(basename $@).exe

-releases: $(zip_releases)
+all-arch: $(PLATFORM_LIST) $(WINDOWS_ARCH_LIST)
+
+releases: $(gz_releases) $(zip_releases)

 clean:
-	rm $(DIR)/*
+	rm $(BINDIR)/*
@@ -1,268 +1,75 @@
-<h1 align="center">tun2socks</h1>
-<h3 align="center">A tun2socks powered by gVisor TCP/IP stack.</h3>
+![tun2socks](docs/logo.png)

-<p align="center">
-  <a href="https://github.com/xjasonlyu/tun2socks/actions">
-    <img src="https://img.shields.io/github/workflow/status/xjasonlyu/tun2socks/Go/master?style=flat-square" alt="GitHub Workflow">
-  </a>
-  <a href="https://hub.docker.com/r/xjasonlyu/tun2socks">
-    <img src="https://img.shields.io/docker/pulls/xjasonlyu/tun2socks?style=flat-square" alt="Docker Pulls">
-  </a>
-  <a href="https://img.shields.io/github/go-mod/go-version/xjasonlyu/tun2socks">
-    <img src="https://img.shields.io/github/go-mod/go-version/xjasonlyu/tun2socks?style=flat-square" alt="Go Version">
-  </a>
-  <a href="https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks">
-    <img src="https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks?style=flat-square" alt="Go Report">
-  </a>
-  <a href="https://github.com/xjasonlyu/tun2socks/blob/master/LICENSE">
-    <img src="https://img.shields.io/github/license/xjasonlyu/tun2socks?style=flat-square" alt="GitHub License">
-  </a>
-  <a href="https://img.shields.io/tokei/lines/github/xjasonlyu/tun2socks">
-    <img src="https://img.shields.io/tokei/lines/github/xjasonlyu/tun2socks?style=flat-square" alt="Total Lines">
-  </a>
-  <a href="https://github.com/xjasonlyu/tun2socks/releases">
-    <img src="https://img.shields.io/github/v/release/xjasonlyu/tun2socks?include_prereleases&style=flat-square" alt="Release">
-  </a>
-</p>
+[![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)
+[![Total Lines][5]](https://img.shields.io/tokei/lines/github/xjasonlyu/tun2socks?style=flat-square)
+[![Releases][6]](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/tokei/lines/github/xjasonlyu/tun2socks?style=flat-square
+[6]: https://img.shields.io/github/v/release/xjasonlyu/tun2socks?include_prereleases&style=flat-square
+
+English | [简体中文](README_ZH.md)
+
+# What is tun2socks?
+
+`tun2socks` is an application used to "socksify" TCP/UDP (IPv4 and IPv6) traffic at the network layer. It implements a TUN virtual network interface which accepts all incoming TCP/UDP packets and forwards them through a SOCKS server.

 ## Features

- ICMP echoing
- IPv6 support
+- ICMP echoing / IPv6 support / Socks5 & SS proxy
+- `SO_BINDTODEVICE` & `SO_MARK` option support
 - Optimized UDP transmission for game acceleration
 - Pure Go implementation, no more CGO required
 - Router mode, routing all the traffic in LAN
- 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))
+- TCP/IP stack powered by *[gVisor](https://github.com/google/gvisor)*
+- More than *2.5Gbps* throughput (10x faster than [v1](https://github.com/xjasonlyu/tun2socks/tree/v1))

 ## Requirements

 | Target | Minimum | Recommended |
 | :----- | :-----: | :---------: |
-| System | linux darwin | linux |
+| System | Linux MacOS Freebsd OpenBSD Windows | Linux or MacOS |
 | Memory | >20MB | >128MB |
-| CPU | amd64 arm64 | amd64 |
+| CPU | AMD64(x86_64) ARM64 | AMD64 with AES-NI & AVX2 |

-## Performance
+## Documentation

-> iPerf3 tested on Debian 10 with i5-10500, 8G RAM
+Documentations and quick start guides can be found at [Github Wiki](https://github.com/xjasonlyu/tun2socks/wiki).

-![iPerf3 Test](assets/iperf3.png)
+## Building from source

-## How to Build
+Due to the limitation of gVisor, tun2socks only supports x86_64 and ARM64 for now. Other architectures may become available in the future.

-### build from source code
+### Environments

-Go compiler version >= 1.15 is required
+Make sure the following dependencies are installed:

-```text
-$ git clone https://github.com/xjasonlyu/tun2socks.git
-$ cd tun2socks
-$ make
+- Go 1.15+
+
+### Building
+
+Build and install the `tun2socks` binary:
+
+```shell
+make tun2socks
+sudo cp ./bin/tun2socks /usr/local/bin
 ```

-### build docker image
+Build for all architectures:

-```text
-$ docker build -t tun2socks .
+```shell
+make all-arch
 ```

-or
-
-```text
-$ docker build -t tun2socks -f ./docker/Dockerfile.aarch64 .
-```
-
-## QuickStart
-
-Download from precompiled [Releases](https://github.com/xjasonlyu/tun2socks/releases).
-
-<details>
-  <summary><b>With Docker</b></summary>
-
-> Since Go 1.12, the runtime now uses MADV_FREE to release unused memory on **linux**. This is more efficient but may result in higher reported RSS. The kernel will reclaim the unused data when it is needed. To revert to the Go 1.11 behavior (MADV_DONTNEED), set the environment variable GODEBUG=madvdontneed=1.
-
-### create docker network (macvlan mode)
-
-```shell script
-docker network create -d macvlan \
-  --subnet=172.20.1.0/25 \
-  --gateway=172.20.1.1 \
-  -o parent=eth0 \
-  switch
-```
-
-### pull `tun2socks` docker image
-
-```shell script
-docker pull xjasonlyu/tun2socks:latest
-```
-
-### run as gateway
-
-> DNS configuration is required.
-
-```shell script
-docker run -d \
-  --network switch \
-  --name tun2socks \
-  --ip 172.20.1.2 \
-  --privileged \
-  --restart always \
-  --sysctl net.ipv4.ip_forward=1 \
-  -e PROXY=socks5://server:port \
-  -e KEY=VALUE... \
-  xjasonlyu/tun2socks:latest
-```
-
-### use docker-compose (recommended)
-
-```yaml
-version: '2.4'
-
-services:
-  tun2socks:
-    image: xjasonlyu/tun2socks:latest
-    cap_add:
-      - NET_ADMIN
-    devices:
-        - '/dev/net/tun:/dev/net/tun'
-    environment:
-      # - GODEBUG=madvdontneed=1
-      - PROXY=socks5://server:port
-      - LOGLEVEL=INFO
-      - API=api://:8080
-      - DNS=dns://:53
-      - HOSTS=localhost=127.0.0.1,router.local=172.20.1.1
-      - EXCLUDED=1.1.1.1,1.0.0.1
-      - EXTRACMD=
-    networks:
-      switch:
-        ipv4_address: 172.20.1.2
-    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
-```
-</details>
-
-<details>
-  <summary><b>With Linux</b></summary>
-
-### 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
-```
-
-### config policy routing
-
-```shell script
-echo "100 tun2socks" >> /etc/iproute2/rt_tables
-
-ip route add default via 198.18.0.1 dev tun0 table tun2socks
-ip route add 172.17.0.0/16 dev eth0 src 172.17.0.3 table tun2socks
-ip route add 198.18.0.0/15 dev tun0 src 198.18.0.1 table tun2socks
-
-ip rule add from 172.20.0.3 to 198.18.0.0/15 priority 1000 prohibit
-ip rule add from 172.20.0.3 priority 2000 table main
-ip rule add from all priority 3000 table tun2socks
-```
-
-### run
-
-> bind to a specific interface to prevent traffic looping.
-
-```shell script
-./tun2socks --loglevel info --device tun://tun0 --proxy socks5://server:port --interface eth0
-```
-</details>
-
-<details>
-  <summary><b>With Script</b></summary>
-
-> entrypoint.sh would take care of tun & routes.
-
-```shell script
-PROXY=socks5://server:port LOGLEVEL=INFO sh ./scripts/entrypoint.sh
-```
-</details>
-
-## Details
-
-<details>
-  <summary><b>API Reference</b></summary>
-
-| Path | Methods | Parameters | Description |
-| :--- | :------ | :--------: | :---------- |
-| `/logs` | GET | `level` | Get real-time logs |
-| `/traffic` | GET | / | Get real-time traffic data |
-| `/version` | GET | / | Get current version |
-| `/connections` | GET | `interval` | Get all connections |
-| `/connections` | DELETE | / | Close all connections |
-| `/connections/{id}` | DELETE | / | Close connection by `id` |
-
-</details>
-
-<details>
-  <summary><b>Help Text</b></summary>
-
-```text
-NAME:
-   tun2socks - A tun2socks powered by gVisor TCP/IP stack.
-
-USAGE:
-   tun2socks [global options] [arguments...]
-
-GLOBAL OPTIONS:
-   --api value                  URL of external API to listen
-   --device value, -d value     URL of device to open
-   --dns value                  URL of fake DNS to listen
-   --hosts value                Extra hosts mapping
-   --interface value, -i value  Bind interface to dial
-   --loglevel value, -l value   Set logging level (default: "INFO")
-   --proxy value, -p value      URL of proxy to dial
-   --version, -v                Print current version (default: false)
-   --help, -h                   show help (default: false)
-```
-
-</details>
-
-<details>
-  <summary><b>Proxy URL</b></summary>
-
-| Protocol | Scheme | Examples |
-| :------- | :----- | :------- |
-| direct | `direct` | `direct://` |
-| socks5 | `socks5` | `socks5://username:password@server:port` |
-| shadowsocks | `ss`, `shadowsocks` | `ss://method:password@server:port` |
-
-</details>
-
 ## Credits

 - [Dreamacro/clash](https://github.com/Dreamacro/clash)
 - [google/gvisor](https://github.com/google/gvisor)
 - [majek/slirpnetstack](https://github.com/majek/slirpnetstack)
-
-## Known Issues
-
-Due to the implementation of pure Go, the memory usage is higher than the previous version.
-If you are sensitive to memory, please go back to [v1](https://github.com/xjasonlyu/tun2socks/tree/v1).
-
-## TODO
-
- [ ] Windows support
+- [WireGuard/wireguard-go](https://git.zx2c4.com/wireguard-go)
@@ -0,0 +1,97 @@
+![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)
+[![Total Lines][5]](https://img.shields.io/tokei/lines/github/xjasonlyu/tun2socks?style=flat-square)
+[![Releases][6]](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/tokei/lines/github/xjasonlyu/tun2socks?style=flat-square
+[6]: https://img.shields.io/github/v/release/xjasonlyu/tun2socks?include_prereleases&style=flat-square
+
+[English](README.md) | 简体中文
+
+## 什么是 tun2socks ？
+
+`tun2socks`是一个用来将网络层的`TCP/UDP`（包括`IPv4`和`IPv6`）流量套接字化的应用。它实现了一个`TUN`虚拟网卡接口，可以把所有到来的`TCP/UDP`包处理并转发给SOCKS服务器。
+
+## 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
+- 结合Clash、V2Ray等代理后端实现全局科学上网
+- 结合Burp、Charles等工具进行应用层数据的调试
+- 结合DHCP、CoreDNS等应用部署路由模式代理局域网流量
+
+## 特性介绍
+
+- ICMP 回应 / IPv6 支持 / Socks5 和 SS 代理支持
+- `SO_BINDTODEVICE` & `SO_MARK` 套接字选项支持
+- 适用于游戏加速，针对UDP流量传输的专门优化
+- 纯 Go 实现，不再需要 CGO，提升了稳定性
+- 路由模式，可以用来转发及代理局域网内所有流量
+- 核心由 *[gVisor](https://github.com/google/gvisor)* 强力驱动的 TCP/IP 网络栈
+- 超过 *2.5Gbps* 的带宽吞吐量（[v1](https://github.com/xjasonlyu/tun2socks/tree/v1) 版本的10x倍以上）
+
+## 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 | AMD64(x86_64) ARM64 | AMD64 with AES-NI & AVX2 |
+
+## 使用文档
+
+文档以及使用方式，请看 [Github Wiki](https://github.com/xjasonlyu/tun2socks/wiki)。
+
+## 源码编译
+
+由于 tun2socks 是基于 gVisor 的 TCP/IP 栈，所以目前只支持 x86_64 和 ARM64 架构。以后其他的架构的支持取决于 gVisor。
+
+### 环境依赖
+
+确保安装了以下环境:
+
+- Go 1.15+
+
+### 开始编译
+
+编译以及安装 `tun2socks` 二进制文件:
+
+```shell
+make tun2socks
+sudo cp ./bin/tun2socks /usr/local/bin
+```
+
+编译所有架构的二进制文件:
+
+```shell
+make all-arch
+```
+
+## 特别感谢
+
+- [Dreamacro/clash](https://github.com/Dreamacro/clash)
+- [google/gvisor](https://github.com/google/gvisor)
+- [majek/slirpnetstack](https://github.com/majek/slirpnetstack)
+- [WireGuard/wireguard-go](https://git.zx2c4.com/wireguard-go)
+
+## 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。
+
+## TODO
+
+- [x] Windows 支持
+- [x] FreeBSD 支持
+- [x] OpenBSD 支持
+- [ ] ~~自动路由模式~~
@@ -0,0 +1,3 @@
+package observable
+
+type Iterable <-chan interface{}
@@ -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
+}
@@ -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()
+}
@@ -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
+}
@@ -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)
+}
@@ -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())
+	}
+}
@@ -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)
+}
@@ -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
+}
@@ -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)
+			}
+		})
+	}
+}
@@ -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)
+		})
+	}
+}
@@ -0,0 +1,15 @@
+// +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")
+	}
+}
@@ -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"))
+	}
+}
@@ -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)
+}
@@ -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))
+	})
+}
@@ -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)
+		})
+	}
+}
@@ -0,0 +1,14 @@
+// +build !linux
+
+package dialer
+
+import (
+	"errors"
+	"syscall"
+)
+
+func setMark(_ int) controlFunc {
+	return func(string, string, syscall.RawConn) error {
+		return errors.New("fwmark: linux only")
+	}
+}
@@ -0,0 +1,8 @@
+package dialer
+
+import "net"
+
+func init() {
+	net.DefaultResolver.PreferGo = true
+	net.DefaultResolver.Dial = DialContext
+}
@@ -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
@@ -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,
+	}
+}
@@ -0,0 +1,4 @@
+// Package obfs provides obfuscation functionality for Shadowsocks protocol.
+package obfs
+
+// Ref: github.com/Dreamacro/clash/component/simple-obfs
@@ -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()
+}
@@ -0,0 +1,507 @@
+
+
+
+
+
+
+Network Working Group                                           M. Leech
+Request for Comments: 1928                    Bell-Northern Research Ltd
+Category: Standards Track                                       M. Ganis
+                                         International Business Machines
+                                                                  Y. Lee
+                                                  NEC Systems Laboratory
+                                                                R. Kuris
+                                                       Unify Corporation
+                                                               D. Koblas
+                                                  Independent Consultant
+                                                                L. Jones
+                                                 Hewlett-Packard Company
+                                                              March 1996
+
+
+                        SOCKS Protocol Version 5
+
+Status of this Memo
+
+   This document specifies an Internet standards track protocol for the
+   Internet community, and requests discussion and suggestions for
+   improvements.  Please refer to the current edition of the "Internet
+   Official Protocol Standards" (STD 1) for the standardization state
+   and status of this protocol.  Distribution of this memo is unlimited.
+
+Acknowledgments
+
+   This memo describes a protocol that is an evolution of the previous
+   version of the protocol, version 4 [1]. This new protocol stems from
+   active discussions and prototype implementations.  The key
+   contributors are: Marcus Leech: Bell-Northern Research, David Koblas:
+   Independent Consultant, Ying-Da Lee: NEC Systems Laboratory, LaMont
+   Jones: Hewlett-Packard Company, Ron Kuris: Unify Corporation, Matt
+   Ganis: International Business Machines.
+
+1.  Introduction
+
+   The use of network firewalls, systems that effectively isolate an
+   organizations internal network structure from an exterior network,
+   such as the INTERNET is becoming increasingly popular.  These
+   firewall systems typically act as application-layer gateways between
+   networks, usually offering controlled TELNET, FTP, and SMTP access.
+   With the emergence of more sophisticated application layer protocols
+   designed to facilitate global information discovery, there exists a
+   need to provide a general framework for these protocols to
+   transparently and securely traverse a firewall.
+
+
+
+
+
+Leech, et al                Standards Track                     [Page 1]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+   There exists, also, a need for strong authentication of such
+   traversal in as fine-grained a manner as is practical. This
+   requirement stems from the realization that client-server
+   relationships emerge between the networks of various organizations,
+   and that such relationships need to be controlled and often strongly
+   authenticated.
+
+   The protocol described here is designed to provide a framework for
+   client-server applications in both the TCP and UDP domains to
+   conveniently and securely use the services of a network firewall.
+   The protocol is conceptually a "shim-layer" between the application
+   layer and the transport layer, and as such does not provide network-
+   layer gateway services, such as forwarding of ICMP messages.
+
+2.  Existing practice
+
+   There currently exists a protocol, SOCKS Version 4, that provides for
+   unsecured firewall traversal for TCP-based client-server
+   applications, including TELNET, FTP and the popular information-
+   discovery protocols such as HTTP, WAIS and GOPHER.
+
+   This new protocol extends the SOCKS Version 4 model to include UDP,
+   and extends the framework to include provisions for generalized
+   strong authentication schemes, and extends the addressing scheme to
+   encompass domain-name and V6 IP addresses.
+
+   The implementation of the SOCKS protocol typically involves the
+   recompilation or relinking of TCP-based client applications to use
+   the appropriate encapsulation routines in the SOCKS library.
+
+Note:
+
+   Unless otherwise noted, the decimal numbers appearing in packet-
+   format diagrams represent the length of the corresponding field, in
+   octets.  Where a given octet must take on a specific value, the
+   syntax X'hh' is used to denote the value of the single octet in that
+   field. When the word 'Variable' is used, it indicates that the
+   corresponding field has a variable length defined either by an
+   associated (one or two octet) length field, or by a data type field.
+
+3.  Procedure for TCP-based clients
+
+   When a TCP-based client wishes to establish a connection to an object
+   that is reachable only via a firewall (such determination is left up
+   to the implementation), it must open a TCP connection to the
+   appropriate SOCKS port on the SOCKS server system.  The SOCKS service
+   is conventionally located on TCP port 1080.  If the connection
+   request succeeds, the client enters a negotiation for the
+
+
+
+Leech, et al                Standards Track                     [Page 2]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+   authentication method to be used, authenticates with the chosen
+   method, then sends a relay request.  The SOCKS server evaluates the
+   request, and either establishes the appropriate connection or denies
+   it.
+
+   Unless otherwise noted, the decimal numbers appearing in packet-
+   format diagrams represent the length of the corresponding field, in
+   octets.  Where a given octet must take on a specific value, the
+   syntax X'hh' is used to denote the value of the single octet in that
+   field. When the word 'Variable' is used, it indicates that the
+   corresponding field has a variable length defined either by an
+   associated (one or two octet) length field, or by a data type field.
+
+   The client connects to the server, and sends a version
+   identifier/method selection message:
+
+                   +----+----------+----------+
+                   |VER | NMETHODS | METHODS  |
+                   +----+----------+----------+
+                   | 1  |    1     | 1 to 255 |
+                   +----+----------+----------+
+
+   The VER field is set to X'05' for this version of the protocol.  The
+   NMETHODS field contains the number of method identifier octets that
+   appear in the METHODS field.
+
+   The server selects from one of the methods given in METHODS, and
+   sends a METHOD selection message:
+
+                         +----+--------+
+                         |VER | METHOD |
+                         +----+--------+
+                         | 1  |   1    |
+                         +----+--------+
+
+   If the selected METHOD is X'FF', none of the methods listed by the
+   client are acceptable, and the client MUST close the connection.
+
+   The values currently defined for METHOD are:
+
+          o  X'00' NO AUTHENTICATION REQUIRED
+          o  X'01' GSSAPI
+          o  X'02' USERNAME/PASSWORD
+          o  X'03' to X'7F' IANA ASSIGNED
+          o  X'80' to X'FE' RESERVED FOR PRIVATE METHODS
+          o  X'FF' NO ACCEPTABLE METHODS
+
+   The client and server then enter a method-specific sub-negotiation.
+
+
+
+Leech, et al                Standards Track                     [Page 3]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+   Descriptions of the method-dependent sub-negotiations appear in
+   separate memos.
+
+   Developers of new METHOD support for this protocol should contact
+   IANA for a METHOD number.  The ASSIGNED NUMBERS document should be
+   referred to for a current list of METHOD numbers and their
+   corresponding protocols.
+
+   Compliant implementations MUST support GSSAPI and SHOULD support
+   USERNAME/PASSWORD authentication methods.
+
+4.  Requests
+
+   Once the method-dependent subnegotiation has completed, the client
+   sends the request details.  If the negotiated method includes
+   encapsulation for purposes of integrity checking and/or
+   confidentiality, these requests MUST be encapsulated in the method-
+   dependent encapsulation.
+
+   The SOCKS request is formed as follows:
+
+        +----+-----+-------+------+----------+----------+
+        |VER | CMD |  RSV  | ATYP | DST.ADDR | DST.PORT |
+        +----+-----+-------+------+----------+----------+
+        | 1  |  1  | X'00' |  1   | Variable |    2     |
+        +----+-----+-------+------+----------+----------+
+
+     Where:
+
+          o  VER    protocol version: X'05'
+          o  CMD
+             o  CONNECT X'01'
+             o  BIND X'02'
+             o  UDP ASSOCIATE X'03'
+          o  RSV    RESERVED
+          o  ATYP   address type of following address
+             o  IP V4 address: X'01'
+             o  DOMAINNAME: X'03'
+             o  IP V6 address: X'04'
+          o  DST.ADDR       desired destination address
+          o  DST.PORT desired destination port in network octet
+             order
+
+   The SOCKS server will typically evaluate the request based on source
+   and destination addresses, and return one or more reply messages, as
+   appropriate for the request type.
+
+
+
+
+
+Leech, et al                Standards Track                     [Page 4]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+5.  Addressing
+
+   In an address field (DST.ADDR, BND.ADDR), the ATYP field specifies
+   the type of address contained within the field:
+
+          o  X'01'
+
+   the address is a version-4 IP address, with a length of 4 octets
+
+          o  X'03'
+
+   the address field contains a fully-qualified domain name.  The first
+   octet of the address field contains the number of octets of name that
+   follow, there is no terminating NUL octet.
+
+          o  X'04'
+
+   the address is a version-6 IP address, with a length of 16 octets.
+
+6.  Replies
+
+   The SOCKS request information is sent by the client as soon as it has
+   established a connection to the SOCKS server, and completed the
+   authentication negotiations.  The server evaluates the request, and
+   returns a reply formed as follows:
+
+        +----+-----+-------+------+----------+----------+
+        |VER | REP |  RSV  | ATYP | BND.ADDR | BND.PORT |
+        +----+-----+-------+------+----------+----------+
+        | 1  |  1  | X'00' |  1   | Variable |    2     |
+        +----+-----+-------+------+----------+----------+
+
+     Where:
+
+          o  VER    protocol version: X'05'
+          o  REP    Reply field:
+             o  X'00' succeeded
+             o  X'01' general SOCKS server failure
+             o  X'02' connection not allowed by ruleset
+             o  X'03' Network unreachable
+             o  X'04' Host unreachable
+             o  X'05' Connection refused
+             o  X'06' TTL expired
+             o  X'07' Command not supported
+             o  X'08' Address type not supported
+             o  X'09' to X'FF' unassigned
+          o  RSV    RESERVED
+          o  ATYP   address type of following address
+
+
+
+Leech, et al                Standards Track                     [Page 5]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+             o  IP V4 address: X'01'
+             o  DOMAINNAME: X'03'
+             o  IP V6 address: X'04'
+          o  BND.ADDR       server bound address
+          o  BND.PORT       server bound port in network octet order
+
+   Fields marked RESERVED (RSV) must be set to X'00'.
+
+   If the chosen method includes encapsulation for purposes of
+   authentication, integrity and/or confidentiality, the replies are
+   encapsulated in the method-dependent encapsulation.
+
+CONNECT
+
+   In the reply to a CONNECT, BND.PORT contains the port number that the
+   server assigned to connect to the target host, while BND.ADDR
+   contains the associated IP address.  The supplied BND.ADDR is often
+   different from the IP address that the client uses to reach the SOCKS
+   server, since such servers are often multi-homed.  It is expected
+   that the SOCKS server will use DST.ADDR and DST.PORT, and the
+   client-side source address and port in evaluating the CONNECT
+   request.
+
+BIND
+
+   The BIND request is used in protocols which require the client to
+   accept connections from the server.  FTP is a well-known example,
+   which uses the primary client-to-server connection for commands and
+   status reports, but may use a server-to-client connection for
+   transferring data on demand (e.g. LS, GET, PUT).
+
+   It is expected that the client side of an application protocol will
+   use the BIND request only to establish secondary connections after a
+   primary connection is established using CONNECT.  In is expected that
+   a SOCKS server will use DST.ADDR and DST.PORT in evaluating the BIND
+   request.
+
+   Two replies are sent from the SOCKS server to the client during a
+   BIND operation.  The first is sent after the server creates and binds
+   a new socket.  The BND.PORT field contains the port number that the
+   SOCKS server assigned to listen for an incoming connection.  The
+   BND.ADDR field contains the associated IP address.  The client will
+   typically use these pieces of information to notify (via the primary
+   or control connection) the application server of the rendezvous
+   address.  The second reply occurs only after the anticipated incoming
+   connection succeeds or fails.
+
+
+
+
+
+Leech, et al                Standards Track                     [Page 6]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+   In the second reply, the BND.PORT and BND.ADDR fields contain the
+   address and port number of the connecting host.
+
+UDP ASSOCIATE
+
+   The UDP ASSOCIATE request is used to establish an association within
+   the UDP relay process to handle UDP datagrams.  The DST.ADDR and
+   DST.PORT fields contain the address and port that the client expects
+   to use to send UDP datagrams on for the association.  The server MAY
+   use this information to limit access to the association.  If the
+   client is not in possesion of the information at the time of the UDP
+   ASSOCIATE, the client MUST use a port number and address of all
+   zeros.
+
+   A UDP association terminates when the TCP connection that the UDP
+   ASSOCIATE request arrived on terminates.
+
+   In the reply to a UDP ASSOCIATE request, the BND.PORT and BND.ADDR
+   fields indicate the port number/address where the client MUST send
+   UDP request messages to be relayed.
+
+Reply Processing
+
+   When a reply (REP value other than X'00') indicates a failure, the
+   SOCKS server MUST terminate the TCP connection shortly after sending
+   the reply.  This must be no more than 10 seconds after detecting the
+   condition that caused a failure.
+
+   If the reply code (REP value of X'00') indicates a success, and the
+   request was either a BIND or a CONNECT, the client may now start
+   passing data.  If the selected authentication method supports
+   encapsulation for the purposes of integrity, authentication and/or
+   confidentiality, the data are encapsulated using the method-dependent
+   encapsulation.  Similarly, when data arrives at the SOCKS server for
+   the client, the server MUST encapsulate the data as appropriate for
+   the authentication method in use.
+
+7.  Procedure for UDP-based clients
+
+   A UDP-based client MUST send its datagrams to the UDP relay server at
+   the UDP port indicated by BND.PORT in the reply to the UDP ASSOCIATE
+   request.  If the selected authentication method provides
+   encapsulation for the purposes of authenticity, integrity, and/or
+   confidentiality, the datagram MUST be encapsulated using the
+   appropriate encapsulation.  Each UDP datagram carries a UDP request
+   header with it:
+
+
+
+
+
+Leech, et al                Standards Track                     [Page 7]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+      +----+------+------+----------+----------+----------+
+      |RSV | FRAG | ATYP | DST.ADDR | DST.PORT |   DATA   |
+      +----+------+------+----------+----------+----------+
+      | 2  |  1   |  1   | Variable |    2     | Variable |
+      +----+------+------+----------+----------+----------+
+
+     The fields in the UDP request header are:
+
+          o  RSV  Reserved X'0000'
+          o  FRAG    Current fragment number
+          o  ATYP    address type of following addresses:
+             o  IP V4 address: X'01'
+             o  DOMAINNAME: X'03'
+             o  IP V6 address: X'04'
+          o  DST.ADDR       desired destination address
+          o  DST.PORT       desired destination port
+          o  DATA     user data
+
+   When a UDP relay server decides to relay a UDP datagram, it does so
+   silently, without any notification to the requesting client.
+   Similarly, it will drop datagrams it cannot or will not relay.  When
+   a UDP relay server receives a reply datagram from a remote host, it
+   MUST encapsulate that datagram using the above UDP request header,
+   and any authentication-method-dependent encapsulation.
+
+   The UDP relay server MUST acquire from the SOCKS server the expected
+   IP address of the client that will send datagrams to the BND.PORT
+   given in the reply to UDP ASSOCIATE.  It MUST drop any datagrams
+   arriving from any source IP address other than the one recorded for
+   the particular association.
+
+   The FRAG field indicates whether or not this datagram is one of a
+   number of fragments.  If implemented, the high-order bit indicates
+   end-of-fragment sequence, while a value of X'00' indicates that this
+   datagram is standalone.  Values between 1 and 127 indicate the
+   fragment position within a fragment sequence.  Each receiver will
+   have a REASSEMBLY QUEUE and a REASSEMBLY TIMER associated with these
+   fragments.  The reassembly queue must be reinitialized and the
+   associated fragments abandoned whenever the REASSEMBLY TIMER expires,
+   or a new datagram arrives carrying a FRAG field whose value is less
+   than the highest FRAG value processed for this fragment sequence.
+   The reassembly timer MUST be no less than 5 seconds.  It is
+   recommended that fragmentation be avoided by applications wherever
+   possible.
+
+   Implementation of fragmentation is optional; an implementation that
+   does not support fragmentation MUST drop any datagram whose FRAG
+   field is other than X'00'.
+
+
+
+Leech, et al                Standards Track                     [Page 8]
+
+RFC 1928                SOCKS Protocol Version 5              March 1996
+
+
+   The programming interface for a SOCKS-aware UDP MUST report an
+   available buffer space for UDP datagrams that is smaller than the
+   actual space provided by the operating system:
+
+          o  if ATYP is X'01' - 10+method_dependent octets smaller
+          o  if ATYP is X'03' - 262+method_dependent octets smaller
+          o  if ATYP is X'04' - 20+method_dependent octets smaller
+
+8.  Security Considerations
+
+   This document describes a protocol for the application-layer
+   traversal of IP network firewalls.  The security of such traversal is
+   highly dependent on the particular authentication and encapsulation
+   methods provided in a particular implementation, and selected during
+   negotiation between SOCKS client and SOCKS server.
+
+   Careful consideration should be given by the administrator to the
+   selection of authentication methods.
+
+9.  References
+
+   [1] Koblas, D., "SOCKS", Proceedings: 1992 Usenix Security Symposium.
+
+Author's Address
+
+       Marcus Leech
+       Bell-Northern Research Ltd
+       P.O. Box 3511, Stn. C,
+       Ottawa, ON
+       CANADA K1Y 4H7
+
+       Phone: (613) 763-9145
+       EMail: mleech@bnr.ca
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Leech, et al                Standards Track                     [Page 9]
+
@@ -0,0 +1,115 @@
+
+
+
+
+
+
+Network Working Group                                           M. Leech
+Request for Comments: 1929                    Bell-Northern Research Ltd
+Category: Standards Track                                     March 1996
+
+
+             Username/Password Authentication for SOCKS V5
+
+Status of this Memo
+
+   This document specifies an Internet standards track protocol for the
+   Internet community, and requests discussion and suggestions for
+   improvements.  Please refer to the current edition of the "Internet
+   Official Protocol Standards" (STD 1) for the standardization state
+   and status of this protocol.  Distribution of this memo is unlimited.
+
+1.  Introduction
+
+   The protocol specification for SOCKS Version 5 specifies a
+   generalized framework for the use of arbitrary authentication
+   protocols in the initial socks connection setup. This document
+   describes one of those protocols, as it fits into the SOCKS Version 5
+   authentication "subnegotiation".
+
+Note:
+
+   Unless otherwise noted, the decimal numbers appearing in packet-
+   format diagrams represent the length of the corresponding field, in
+   octets.  Where a given octet must take on a specific value, the
+   syntax X'hh' is used to denote the value of the single octet in that
+   field. When the word 'Variable' is used, it indicates that the
+   corresponding field has a variable length defined either by an
+   associated (one or two octet) length field, or by a data type field.
+
+2.  Initial negotiation
+
+   Once the SOCKS V5 server has started, and the client has selected the
+   Username/Password Authentication protocol, the Username/Password
+   subnegotiation begins.  This begins with the client producing a
+   Username/Password request:
+
+           +----+------+----------+------+----------+
+           |VER | ULEN |  UNAME   | PLEN |  PASSWD  |
+           +----+------+----------+------+----------+
+           | 1  |  1   | 1 to 255 |  1   | 1 to 255 |
+           +----+------+----------+------+----------+
+
+
+
+
+
+
+Leech                       Standards Track                     [Page 1]
+
+RFC 1929          Username Authentication for SOCKS V5        March 1996
+
+
+   The VER field contains the current version of the subnegotiation,
+   which is X'01'. The ULEN field contains the length of the UNAME field
+   that follows. The UNAME field contains the username as known to the
+   source operating system. The PLEN field contains the length of the
+   PASSWD field that follows. The PASSWD field contains the password
+   association with the given UNAME.
+
+   The server verifies the supplied UNAME and PASSWD, and sends the
+   following response:
+
+                        +----+--------+
+                        |VER | STATUS |
+                        +----+--------+
+                        | 1  |   1    |
+                        +----+--------+
+
+   A STATUS field of X'00' indicates success. If the server returns a
+   `failure' (STATUS value other than X'00') status, it MUST close the
+   connection.
+
+3.  Security Considerations
+
+   This document describes a subnegotiation that provides authentication
+   services to the SOCKS protocol. Since the request carries the
+   password in cleartext, this subnegotiation is not recommended for
+   environments where "sniffing" is possible and practical.
+
+4.  Author's Address
+
+   Marcus Leech
+   Bell-Northern Research Ltd
+   P.O. Box 3511, Station C
+   Ottawa, ON
+   CANADA K1Y 4H7
+
+   Phone: +1 613 763 9145
+   EMail: mleech@bnr.ca
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Leech                       Standards Track                     [Page 2]
+
@@ -0,0 +1,355 @@
+// Package socks5 provides SOCKS5 client functionalities.
+package socks5
+
+// Ref: github.com/Dreamacro/clash/component/socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+)
+
+// Version is the protocol version as defined in RFC 1928 section 4.
+const Version = 0x05
+
+// Command is request commands as defined in RFC 1928 section 4.
+type Command = uint8
+
+// SOCKS request commands as defined in RFC 1928 section 4.
+const (
+	CmdConnect      Command = 0x01
+	CmdBind         Command = 0x02
+	CmdUDPAssociate Command = 0x03
+)
+
+type Atyp = uint8
+
+// SOCKS address types as defined in RFC 1928 section 5.
+const (
+	AtypIPv4       Atyp = 0x01
+	AtypDomainName Atyp = 0x03
+	AtypIPv6       Atyp = 0x04
+)
+
+// MaxAddrLen is the maximum size of SOCKS address in bytes.
+const MaxAddrLen = 1 + 1 + 255 + 2
+
+// MaxAuthLen is the maximum size of user/password field in SOCKS auth.
+const MaxAuthLen = 255
+
+// Addr represents a SOCKS address as defined in RFC 1928 section 5.
+type Addr []byte
+
+func (a Addr) Valid() bool {
+	if len(a) < 1+1+2 /* minimum length */ {
+		return false
+	}
+
+	switch a[0] {
+	case AtypDomainName:
+		if len(a) < 1+1+int(a[1])+2 {
+			return false
+		}
+	case AtypIPv4:
+		if len(a) < 1+net.IPv4len+2 {
+			return false
+		}
+	case AtypIPv6:
+		if len(a) < 1+net.IPv6len+2 {
+			return false
+		}
+	}
+	return true
+}
+
+// String returns string of socks5.Addr.
+func (a Addr) String() string {
+	if !a.Valid() {
+		return ""
+	}
+
+	var host, port string
+	switch a[0] {
+	case AtypDomainName:
+		hostLen := int(a[1])
+		host = string(a[2 : 2+hostLen])
+		port = strconv.Itoa(int(binary.BigEndian.Uint16(a[2+hostLen:])))
+	case AtypIPv4:
+		host = net.IP(a[1 : 1+net.IPv4len]).String()
+		port = strconv.Itoa(int(binary.BigEndian.Uint16(a[1+net.IPv4len:])))
+	case AtypIPv6:
+		host = net.IP(a[1 : 1+net.IPv6len]).String()
+		port = strconv.Itoa(int(binary.BigEndian.Uint16(a[1+net.IPv6len:])))
+	}
+	return net.JoinHostPort(host, port)
+}
+
+// UDPAddr converts a socks5.Addr to *net.UDPAddr.
+func (a Addr) UDPAddr() *net.UDPAddr {
+	if !a.Valid() {
+		return nil
+	}
+
+	var ip []byte
+	var port int
+	switch a[0] {
+	case AtypDomainName /* unsupported */ :
+		return nil
+	case AtypIPv4:
+		ip = make([]byte, net.IPv4len)
+		copy(ip, a[1:1+net.IPv4len])
+		port = int(binary.BigEndian.Uint16(a[1+net.IPv4len:]))
+	case AtypIPv6:
+		ip = make([]byte, net.IPv6len)
+		copy(ip, a[1:1+net.IPv6len])
+		port = int(binary.BigEndian.Uint16(a[1+net.IPv6len:]))
+	}
+	return &net.UDPAddr{IP: ip, Port: port}
+}
+
+// User provides basic socks5 auth functionality.
+type User struct {
+	Username string
+	Password string
+}
+
+// ClientHandshake fast-tracks SOCKS initialization to get target address to connect on client side.
+func ClientHandshake(rw io.ReadWriter, addr Addr, command Command, user *User) (Addr, error) {
+	buf := make([]byte, MaxAddrLen)
+	var err error
+
+	// VER, NMETHODS, METHODS
+	if user != nil {
+		_, err = rw.Write([]byte{Version, 0x01 /* NMETHODS */, 0x02 /* USERNAME/PASSWORD */})
+	} else {
+		_, err = rw.Write([]byte{Version, 0x01 /* NMETHODS */, 0x00 /* NO AUTHENTICATION REQUIRED */})
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	// VER, METHOD
+	if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+		return nil, err
+	}
+
+	if buf[0] != Version {
+		return nil, errors.New("socks version mismatched")
+	}
+
+	if buf[1] == 0x02 /* USERNAME/PASSWORD */ {
+		if user == nil {
+			return nil, errors.New("auth required")
+		}
+
+		// password protocol version
+		authMsg := &bytes.Buffer{}
+		authMsg.WriteByte(0x01 /* VER */)
+		authMsg.WriteByte(byte(len(user.Username)) /* ULEN */)
+		authMsg.WriteString(user.Username /* UNAME */)
+		authMsg.WriteByte(byte(len(user.Password)) /* PLEN */)
+		authMsg.WriteString(user.Password /* PASSWD */)
+
+		if len(authMsg.Bytes()) > MaxAuthLen {
+			return nil, errors.New("auth message too long")
+		}
+
+		if _, err := rw.Write(authMsg.Bytes()); err != nil {
+			return nil, err
+		}
+
+		if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+			return nil, err
+		}
+
+		if buf[1] != 0x00 /* STATUS of SUCCESS */ {
+			return nil, errors.New("rejected username/password")
+		}
+
+	} else if buf[1] != 0x00 /* NO AUTHENTICATION REQUIRED */ {
+		return nil, errors.New("unsupported method")
+	}
+
+	// VER, CMD, RSV, ADDR
+	if _, err := rw.Write(bytes.Join([][]byte{{Version, command, 0x00 /* RSV */}, addr}, nil)); err != nil {
+		return nil, err
+	}
+
+	// VER, REP, RSV
+	if _, err := io.ReadFull(rw, buf[:3]); err != nil {
+		return nil, err
+	}
+
+	if buf[1] != 0x00 /* SUCCEEDED */ {
+		return nil, fmt.Errorf("unsucceed reply: %X", buf[1])
+	}
+
+	return ReadAddr(rw, buf)
+}
+
+func ReadAddr(r io.Reader, b []byte) (Addr, error) {
+	if len(b) < MaxAddrLen {
+		return nil, io.ErrShortBuffer
+	}
+
+	// read 1st byte for address type
+	if _, err := io.ReadFull(r, b[:1]); err != nil {
+		return nil, err
+	}
+
+	switch b[0] /* ATYP */ {
+	case AtypDomainName:
+		// read 2nd byte for domain length
+		if _, err := io.ReadFull(r, b[1:2]); err != nil {
+			return nil, err
+		}
+		domainLength := uint16(b[1])
+		_, err := io.ReadFull(r, b[2:2+domainLength+2])
+		return b[:1+1+domainLength+2], err
+	case AtypIPv4:
+		_, err := io.ReadFull(r, b[1:1+net.IPv4len+2])
+		return b[:1+net.IPv4len+2], err
+	case AtypIPv6:
+		_, err := io.ReadFull(r, b[1:1+net.IPv6len+2])
+		return b[:1+net.IPv6len+2], err
+	default:
+		return nil, errors.New("invalid address type")
+	}
+}
+
+// SplitAddr slices a SOCKS address from beginning of b. Returns nil if failed.
+func SplitAddr(b []byte) Addr {
+	addrLen := 1
+	if len(b) < addrLen {
+		return nil
+	}
+
+	switch b[0] {
+	case AtypDomainName:
+		if len(b) < 2 {
+			return nil
+		}
+		addrLen = 1 + 1 + int(b[1]) + 2
+	case AtypIPv4:
+		addrLen = 1 + net.IPv4len + 2
+	case AtypIPv6:
+		addrLen = 1 + net.IPv6len + 2
+	default:
+		return nil
+	}
+
+	if len(b) < addrLen {
+		return nil
+	}
+
+	return b[:addrLen]
+}
+
+// ParseAddr parses the address in string s. Returns nil if failed.
+func ParseAddr(s string) Addr {
+	host, port, err := net.SplitHostPort(s)
+	if err != nil {
+		return nil
+	}
+
+	var addr Addr
+	if ip := net.ParseIP(host); ip != nil {
+		if ip4 := ip.To4(); ip4 != nil {
+			addr = make([]byte, 1+net.IPv4len+2)
+			addr[0] = AtypIPv4
+			copy(addr[1:], ip4)
+		} else {
+			addr = make([]byte, 1+net.IPv6len+2)
+			addr[0] = AtypIPv6
+			copy(addr[1:], ip)
+		}
+	} else {
+		if len(host) > 255 {
+			return nil
+		}
+		addr = make([]byte, 1+1+len(host)+2)
+		addr[0] = AtypDomainName
+		addr[1] = byte(len(host))
+		copy(addr[2:], host)
+	}
+
+	p, err := strconv.ParseUint(port, 10, 16)
+	if err != nil {
+		return nil
+	}
+	binary.BigEndian.PutUint16(addr[len(addr)-2:], uint16(p))
+
+	return addr
+}
+
+// ParseAddrToSocksAddr parse a socks addr from net.addr
+// This is a fast path of ParseAddr(addr.String())
+func ParseAddrToSocksAddr(addr net.Addr) Addr {
+	var ip net.IP
+	var port int
+	if udpAddr, ok := addr.(*net.UDPAddr); ok {
+		ip = udpAddr.IP
+		port = udpAddr.Port
+	} else if tcpAddr, ok := addr.(*net.TCPAddr); ok {
+		ip = tcpAddr.IP
+		port = tcpAddr.Port
+	}
+
+	// fallback parse
+	if ip == nil {
+		return ParseAddr(addr.String())
+	}
+
+	var parsed Addr
+	if ip4 := ip.To4(); ip4 != nil {
+		parsed = make([]byte, 1+net.IPv4len+2)
+		parsed[0] = AtypIPv4
+		copy(parsed[1:], ip4)
+		binary.BigEndian.PutUint16(parsed[1+net.IPv4len:], uint16(port))
+	} else {
+		parsed = make([]byte, 1+net.IPv6len+2)
+		parsed[0] = AtypIPv6
+		copy(parsed[1:], ip)
+		binary.BigEndian.PutUint16(parsed[1+net.IPv6len:], uint16(port))
+	}
+	return parsed
+}
+
+// DecodeUDPPacket split `packet` to addr payload, and this function is mutable with `packet`
+func DecodeUDPPacket(packet []byte) (addr Addr, payload []byte, err error) {
+	if len(packet) < 5 {
+		err = errors.New("insufficient length of packet")
+		return
+	}
+
+	// packet[0] and packet[1] are reserved
+	if !bytes.Equal(packet[:2], []byte{0x00, 0x00}) {
+		err = errors.New("reserved fields should be zero")
+		return
+	}
+
+	if packet[2] != 0x00 /* fragments */ {
+		err = errors.New("discarding fragmented payload")
+		return
+	}
+
+	addr = SplitAddr(packet[3:])
+	if addr == nil {
+		err = errors.New("socks5 UDP addr is nil")
+	}
+
+	payload = packet[3+len(addr):]
+	return
+}
+
+func EncodeUDPPacket(addr Addr, payload []byte) (packet []byte, err error) {
+	if addr == nil {
+		return nil, errors.New("address is invalid")
+	}
+	packet = bytes.Join([][]byte{{0x00, 0x00, 0x00}, addr, payload}, nil)
+	return
+}
@@ -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/component/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 +82,12 @@ 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
+	return m.SrcIP != nil && m.DstIP != nil
 }
@@ -0,0 +1,8 @@
+package constant
+
+const Name = "tun2socks"
+
+var (
+	Version   = ""
+	BuildTime = ""
+)
@@ -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)
 }
@@ -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
+}
@@ -1,9 +1,10 @@
-package rwc
+// Package channel 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, _ *stack.GSO, _ 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, _ *stack.GSO, 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 {
@@ -114,14 +106,6 @@ 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)
-}
-
 // MTU implements stack.LinkEndpoint.MTU.
 func (e *Endpoint) MTU() uint32 {
 	return e.mtu
@@ -129,12 +113,7 @@ 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 +137,4 @@ 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() {}
@@ -0,0 +1,5 @@
+// +build darwin freebsd openbsd
+
+package tun
+
+const offset = 4 /* 4 bytes TUN_PI */
@@ -0,0 +1,3 @@
+package tun
+
+const offset = 0
@@ -0,0 +1,15 @@
+package tun
+
+type Option func(*TUN)
+
+func WithName(name string) Option {
+	return func(t *TUN) {
+		t.name = name
+	}
+}
+
+func WithMTU(mtu uint32) Option {
+	return func(t *TUN) {
+		t.mtu = mtu
+	}
+}
@@ -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)
@@ -0,0 +1,107 @@
+package tun
+
+import (
+	"errors"
+	"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(opts ...Option) (device.Device, error) {
+	t := &TUN{}
+
+	for _, opt := range opts {
+		opt(t)
+	}
+
+	if len(t.name) >= unix.IFNAMSIZ {
+		return nil, errors.New("interface name too long")
+	}
+
+	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 errors.New("failed to set MTU")
+	}
+
+	return nil
+}
@@ -0,0 +1,78 @@
+// +build !linux
+
+package tun
+
+import (
+	"fmt"
+
+	"github.com/xjasonlyu/tun2socks/common/pool"
+	"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(opts ...Option) (device.Device, error) {
+	t := &TUN{}
+
+	for _, opt := range opts {
+		opt(t)
+	}
+
+	nt, err := tun.CreateTUN(t.name, int(t.mtu))
+	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, uint32(mtu))
+	if err != nil {
+		return nil, fmt.Errorf("create endpoint: %w", err)
+	}
+	t.Endpoint = ep
+
+	return t, nil
+}
+
+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)
+}
+
+func (t *TUN) Name() string {
+	name, _ := t.nt.Name()
+	return name
+}
+
+func (t *TUN) Close() error {
+	return t.nt.Close()
+}
@@ -0,0 +1,6 @@
+package core
+
+type Handler interface {
+	Add(TCPConn)
+	AddPacket(UDPPacket)
+}
@@ -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
+	}
+}
@@ -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
@@ -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)
@@ -72,7 +110,7 @@ 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 {
+	return func(s *Stack) error {
 		if err := s.SetForwarding(ipv4.ProtocolNumber, v); err != nil {
 			return fmt.Errorf("set ipv4 forwarding: %s", err)
 		}
@@ -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)
@@ -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
+}
@@ -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
 }
@@ -1,4 +1,4 @@
-package core
+package stack

 import (
 	"fmt"
@@ -9,17 +9,15 @@ 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"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
 )

-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 {
+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
 			udpHdr := header.UDP(pkt.TransportHeader().View())
@@ -37,28 +35,16 @@ func WithUDPHandler(handle udpHandleFunc) Option {

 			s.Stats().UDP.PacketsReceived.Increment()

-			netHdr := pkt.Network()
-			route, err := s.FindRoute(pkt.NICID, netHdr.DestinationAddress(), netHdr.SourceAddress(), pkt.NetworkProtocolNumber, false /* multicastLoop */)
-			if err != nil {
-				log.Warnf("[STACK] find route error: %v", err)
-				return true
-			}
-			route.ResolveWith(pkt.SourceLinkAddress())
-
 			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,
+				nicID:    pkt.NICID,
+				netHdr:   pkt.Network(),
+				netProto: pkt.NetworkProtocolNumber,
+				payload:  pkt.Data.ToView(),
 			}

-			handle(packet)
+			s.handler.AddPacket(packet)
 			return true
 		}
 		s.SetTransportProtocolHandler(udp.ProtocolNumber, udpHandlePacket)
@@ -67,9 +53,11 @@ func WithUDPHandler(handle udpHandleFunc) Option {
 }

 type udpPacket struct {
-	id       stack.TransportEndpointID
-	r        *stack.Route
-	metadata *adapter.Metadata
+	s        *Stack
+	id       *stack.TransportEndpointID
+	nicID    tcpip.NICID
+	netHdr   header.Network
+	netProto tcpip.NetworkProtocolNumber
 	payload  []byte
 }

@@ -78,17 +66,17 @@ func (p *udpPacket) Data() []byte {
 }

 func (p *udpPacket) Drop() {
-	p.r.Release()
+	/* Release */
+}
+
+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)}
 }
@@ -97,13 +85,22 @@ 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{})
 	}

+	route, err := p.s.FindRoute(p.nicID, p.netHdr.DestinationAddress(), 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, p.id.LocalPort, p.id.RemotePort, udpNoChecksum); err != nil {
+			return 0, fmt.Errorf("%v", err)
+		}
+		return data.Size(), nil
 	}

 	udpAddr, ok := addr.(*net.UDPAddr)
@@ -111,20 +108,21 @@ func (p *udpPacket) WriteBack(b []byte, addr net.Addr) (int, error) {
 		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)
+		route.LocalAddress = tcpip.Address(ipv4)
 	} else {
-		r.LocalAddress = tcpip.Address(udpAddr.IP)
+		route.LocalAddress = tcpip.Address(udpAddr.IP)
 	}
-	return sendUDP(&r, data, uint16(udpAddr.Port), p.id.RemotePort, udpNoChecksum)
+
+	if err := sendUDP(route, data, uint16(udpAddr.Port), p.id.RemotePort, udpNoChecksum); err != nil {
+		return 0, fmt.Errorf("%v", err)
+	}
+	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,
@@ -155,18 +153,19 @@ func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort u
 	}

 	ttl := r.DefaultTTL()
+
 	if err := r.WritePacket(nil /* gso */, 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.
@@ -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"]
@@ -2,24 +2,32 @@ version: '2.4'

 services:
  tun2socks:
-    image: xjasonlyu/tun2socks:latest
+    image: ghcr.io/xjasonlyu/tun2socks:latest
    cap_add:
      - NET_ADMIN
    devices:
        - '/dev/net/tun:/dev/net/tun'
    environment:
      - GODEBUG=madvdontneed=1
-      - PROXY=
      - LOGLEVEL=
-      - API=
-      - DNS=
-      - HOSTS=
-      - EXCLUDED=
-      - EXTRACMD=
+      - TUN=
+      - ETH=
+      - TUN_ADDR=
+      - TUN_MASK=
+      - PROXY=
+      - STATS=
+      - TOKEN=
+      - MTU=
+      - EXTRA_COMMANDS=
+      - TUN_INCLUDED_ROUTES=
+      - TUN_EXCLUDED_ROUTES=
    networks:
      switch:
        ipv4_address: 172.20.1.2
-    restart: always
+    sysctls:
+      - net.ipv4.ip_forward=1
+      - net.ipv4.conf.all.rp_filter=0
+    restart: unless-stopped
    container_name: tun2socks

 networks:
@@ -0,0 +1,78 @@
+#!/bin/sh
+
+TUN="${TUN:-tun0}"
+TUN_ADDR="${TUN_ADDR:-198.18.0.1/15}"
+LOGLEVEL="${LOGLEVEL:-info}"
+
+TABLE="${TABLE:-0x2d5}"
+FWMARK="${FWMARK:-0x2d5}"
+
+create_tun() {
+  # create tun device
+  ip tuntap add mode tun dev "$TUN"
+  ip addr add "$TUN_ADDR" dev "$TUN"
+  ip link set dev "$TUN" up
+}
+
+config_route() {
+  # clone main route
+  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"
+
+  # policy routing
+  ip rule add not fwmark "$FWMARK" table "$TABLE"
+  ip rule add fwmark "$FWMARK" to "$TUN_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 "$addr" table main
+  done
+}
+
+disable_rp_filter() {
+  for path in /proc/sys/net/ipv4/conf/*; do
+    echo 0 > "$path/rp_filter"
+  done
+}
+
+main() {
+  create_tun
+  config_route
+  disable_rp_filter
+
+  # 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 $TOKEN"
+  fi
+
+  exec tun2socks \
+    --loglevel "$LOGLEVEL" \
+    --fwmark "$FWMARK" \
+    --device "$TUN" \
+    --proxy "$PROXY" \
+    $ARGS
+}
+
+main || exit 1
@@ -0,0 +1,158 @@
+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"
+)
+
+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       uint32
+	Mark      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.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) 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, 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
+}
@@ -0,0 +1,98 @@
+package engine
+
+import (
+	"encoding/base64"
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/xjasonlyu/tun2socks/core/device"
+	"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 = tun.Driver + "://" + s /* default driver */
+	}
+
+	u, err := url.Parse(s)
+	if err != nil {
+		return nil, err
+	}
+
+	name := u.Host
+	driver := strings.ToLower(u.Scheme)
+
+	switch driver {
+	case tun.Driver:
+		return tun.Open(tun.WithName(name), tun.WithMTU(mtu))
+	default:
+		return nil, fmt.Errorf("unsupported driver: %s", driver)
+	}
+}
+
+func parseProxy(s string) (proxy.Proxy, error) {
+	if !strings.Contains(s, "://") {
+		s = proto.Socks5.String() + "://" + s /* default protocol */
+	}
+
+	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.Socks5.String():
+		return proxy.NewSocks5(parseSocks(u))
+	case proto.Shadowsocks.String():
+		return proxy.NewShadowsocks(parseShadowsocks(u))
+	default:
+		return nil, fmt.Errorf("unsupported protocol: %s", protocol)
+	}
+}
+
+func parseSocks(u *url.URL) (address, username, password string) {
+	address = u.Host
+	username = u.User.Username()
+	password, _ = u.User.Password()
+	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)
+		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
+}
@@ -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)
+}
@@ -0,0 +1,22 @@
+package engine
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+
+	"github.com/xjasonlyu/tun2socks/constant"
+)
+
+func showVersion() {
+	fmt.Print(versionString())
+	fmt.Print(releaseString())
+}
+
+func versionString() string {
+	return fmt.Sprintf("%s %s\n", constant.Name, strings.TrimPrefix(constant.Version, "v"))
+}
+
+func releaseString() string {
+	return fmt.Sprintf("%s/%s, %s, %s\n", runtime.GOOS, runtime.GOARCH, runtime.Version(), constant.BuildTime)
+}
@@ -7,16 +7,16 @@ require (
 	github.com/go-chi/chi v4.1.2+incompatible
 	github.com/go-chi/cors v1.1.1
 	github.com/go-chi/render v1.0.1
-	github.com/gofrs/uuid v3.3.0+incompatible
+	github.com/gofrs/uuid v4.0.0+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 v2.3.0
-	github.com/xjasonlyu/clash v0.15.1-0.20201105074459-aa45c8b56cf6
+	github.com/spf13/pflag v1.0.5
+	github.com/stretchr/testify v1.5.1
 	go.uber.org/atomic v1.7.0
-	golang.org/x/net v0.0.0-20201031054903-ff519b6c9102 // indirect
-	golang.org/x/sys v0.0.0-20201106081118-db71ae66460a // indirect
-	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
-	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
-	gvisor.dev/gvisor v0.0.0-20201107070040-22fc22ad6ef7
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
+	golang.org/x/net v0.0.0-20210119194325-5f4716e94777 // indirect
+	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c
+	golang.org/x/time v0.0.0-20201208040808-7e3f01d25324
+	golang.zx2c4.com/wireguard v0.0.20201118
+	gvisor.dev/gvisor v0.0.0-20210207054208-21036aed5e58
 )
@@ -6,11 +6,33 @@ cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6A
 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 v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.75.0/go.mod h1:VGuuCn7PG0dwsd5XPVm2Mm3wlh3EL55/79EKB6hlPTY=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 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=
@@ -23,8 +45,9 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/Dreamacro/go-shadowsocks2 v0.1.6 h1:PysSf9sLT3Qn8jhlin5v7Rk68gOQG4K5BZFY1nxLGxI=
 github.com/Dreamacro/go-shadowsocks2 v0.1.6/go.mod h1:LSXCjyHesPY3pLjhwff1mQX72ItcBT/N2xNC685cYeU=
-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/Microsoft/go-winio v0.4.16-0.20201130162521-d1ffc52c7331/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
+github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
+github.com/Microsoft/hcsshim v0.8.14/go.mod h1:NtVKoYxQuTLx6gEq0L96c9Ju4JbRJ4nY2ow3VK6a9Lg=
 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=
@@ -34,18 +57,30 @@ github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWR
 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/cilium/ebpf v0.2.0/go.mod h1:To2CFviqOWL/M0gIMsvSMlqe7em/l1ALkX1PyjrX2Qs=
 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/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/containerd/cgroups v0.0.0-20200531161412-0dbf7f05ba59/go.mod h1:pA0z1pT8KYB3TCXK/ocprsh7MAkoW8bZVzPdih9snmM=
+github.com/containerd/cgroups v0.0.0-20201119153540-4cbc285b3327/go.mod h1:ZJeTFisyysqgcCdecO57Dj79RfL0LNeGiFUqLYQRYLE=
+github.com/containerd/console v0.0.0-20180822173158-c12b1e7919c1/go.mod h1:Tj/on1eG8kiEhd0+fhSDzsPAFESxzBBvdyEgyryXffw=
 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/console v1.0.1/go.mod h1:XUsP6YE/mKtz6bxc+I8UiKKTP04qjQL4qcS3XoQ5xkw=
+github.com/containerd/containerd v1.3.2/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
+github.com/containerd/containerd v1.3.9/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
+github.com/containerd/continuity v0.0.0-20190426062206-aaeac12a7ffc/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
+github.com/containerd/continuity v0.0.0-20201208142359-180525291bb7/go.mod h1:kR3BEg7bDFaEddKm54WSmrol1fKWDU1nKYkgrcgZT7Y=
+github.com/containerd/fifo v0.0.0-20190226154929-a9fb20d87448/go.mod h1:ODA38xgv3Kuk8dQz2ZQXpnv/UZZUHUCL7pnLehbXgQI=
 github.com/containerd/fifo v0.0.0-20191213151349-ff969a566b00/go.mod h1:jPQ2IAeZRCYxpS/Cm1495vGFww6ecHmMk1YJH2Q5ln0=
+github.com/containerd/go-runc v0.0.0-20180907222934-5a6d9f37cfa3/go.mod h1:IV7qH3hrUgRmyYrtgEeGWJfWbgcHL9CSRruz2Vqcph0=
 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/ttrpc v0.0.0-20190828154514-0e0f228740de/go.mod h1:PvCDdDGpgqzQIzDW1TphrGLssLDZp2GuS+X5DkEJB8o=
+github.com/containerd/ttrpc v1.0.2/go.mod h1:UAxOpgT9ziI0gJrmKvgcZivgxOp8iFPSk8httJEt98Y=
+github.com/containerd/typeurl v0.0.0-20180627222232-a93fcdb778cd/go.mod h1:Cm3kwCdlkCfMSHURc+r6fwoGH6/F1hH3S4sg0rLFWPc=
 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/coreos/go-systemd/v22 v22.1.0/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=
 github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
@@ -61,13 +96,14 @@ github.com/docker/go-connections v0.3.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5Xh
 github.com/docker/go-events v0.0.0-20190806004212-e31b211e4f1c/go.mod h1:Uw6UezgYA44ePAFQYUehOuCzmy5zmg/+nl2ZfMWGkpA=
 github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
-github.com/dpjacques/clockwork v0.1.1-0.20200827220843-c1f524b839be/go.mod h1:D8mP2A8vVT2GkXqPorSBmhnshhkFBYgzhA90KmJt25Y=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/elazarl/goproxy v0.0.0-20170405201442-c4fc26588b6e/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/go-control-plane v0.9.7/go.mod h1:cwu0lG7PUMfa9snN8LXBig5ynNVH9qI8YYLbd1fK2po=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/evanphx/json-patch v4.2.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
@@ -78,17 +114,18 @@ github.com/go-chi/cors v1.1.1 h1:eHuqxsIw89iXcWnWUN8R72JMibABJTN/4IOYI5WERvw=
 github.com/go-chi/cors v1.1.1/go.mod h1:K2Yje0VW/SJzxiyMYu6iPQYa7hMjQX2i/F491VChg1I=
 github.com/go-chi/render v1.0.1 h1:4/5tis2cKaNdnv9zFLfXzcquC9HbeZgCnxGnKrltBS8=
 github.com/go-chi/render v1.0.1/go.mod h1:pq4Rr7HbnsdaeHagklXub+p6Wd16Af5l9koip1OvJns=
+github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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@@ -96,20 +133,29 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
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@@ -117,20 +163,33 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
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@@ -139,11 +198,12 @@ github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0U
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@@ -163,8 +223,6 @@ github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
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@@ -178,17 +236,13 @@ github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+W
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 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -197,6 +251,7 @@ github.com/pmezard/go-difflib v0.0.0-20151028094244-d8ed2627bdf0/go.mod h1:iKH77
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@@ -208,12 +263,11 @@ github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6Mwd
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@@ -222,21 +276,26 @@ github.com/stretchr/testify v0.0.0-20151208002404-e3a8ff8ce365/go.mod h1:a8OnRci
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@@ -248,14 +307,21 @@ golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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@@ -264,13 +330,20 @@ golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTk
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@@ -283,25 +356,46 @@ golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn
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@@ -398,21 +554,59 @@ google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRn
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-gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
-gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
-gvisor.dev/gvisor v0.0.0-20201107070040-22fc22ad6ef7 h1:JKZNg4wnh94dWyhXSNOQ4jkliNbcRJt1Vs5NPyMOo48=
-gvisor.dev/gvisor v0.0.0-20201107070040-22fc22ad6ef7/go.mod h1:t4GUXJhnQEPtYSvrvRNW5CNdBQ2oWZBy7P+FbCVKBFY=
+gvisor.dev/gvisor v0.0.0-20210207054208-21036aed5e58 h1:mGt9tyR+QR3vwST1urdmz4fFupFUKInN2RZeiwC88Mo=
+gvisor.dev/gvisor v0.0.0-20210207054208-21036aed5e58/go.mod h1:bGHhdxWoqL+3AwdMfePr6TWTcvHO33egRmxDPAQFdJE=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.1.1/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las=
 k8s.io/api v0.16.13/go.mod h1:QWu8UWSTiuQZMMeYjwLs6ILu5O74qKSJ0c+4vrchDxs=
 k8s.io/apimachinery v0.16.13/go.mod h1:4HMHS3mDHtVttspuuhrJ1GGr/0S9B6iWYWZ57KnnZqQ=
 k8s.io/apimachinery v0.16.14-rc.0/go.mod h1:4HMHS3mDHtVttspuuhrJ1GGr/0S9B6iWYWZ57KnnZqQ=
@@ -450,5 +641,7 @@ 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=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 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=
@@ -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}
-}
@@ -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
-}
@@ -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",
-	}
-)
@@ -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
-}
@@ -1,93 +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),
-
-		// 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(defaultNICID, nicSpoofingEnabled),
-	)
-}
@@ -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()
-}
@@ -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)
-}
@@ -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
-}
@@ -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
-}
@@ -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
-}
@@ -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)
-}
@@ -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
-}
@@ -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")
-}
@@ -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)
-}
@@ -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()
-}
@@ -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))
-}
@@ -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)
-	}
-}
@@ -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
-}
@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"time"

-	"github.com/xjasonlyu/clash/common/observable"
+	"github.com/xjasonlyu/tun2socks/common/observable"
 )

 var (
@@ -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
@@ -8,7 +8,7 @@ import (
 )

 var (
-	// defaultLevel is package default loglevel.
+	// defaultLevel is package default logging level.
 	defaultLevel = InfoLevel
 )

@@ -2,42 +2,43 @@ package main

 import (
 	"os"
-	"time"
+	"os/signal"
+	"syscall"

-	"github.com/urfave/cli/v2"
+	"github.com/xjasonlyu/tun2socks/engine"
+	"github.com/xjasonlyu/tun2socks/log"

-	"github.com/xjasonlyu/tun2socks/internal/cmd"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
+	flag "github.com/spf13/pflag"
 )

-const About = "A tun2socks powered by gVisor TCP/IP stack."
+var key = new(engine.Key)

-var (
-	Version   string
-	BuildTime string
-)
+func init() {
+	flag.StringVarP(&key.Device, "device", "d", "", "use this device [driver://]name")
+	flag.IntVar(&key.Mark, "fwmark", 0, "set firewall MARK (Linux only)")
+	flag.StringVarP(&key.Interface, "interface", "i", "", "use network INTERFACE (Linux/MacOS only)")
+	flag.StringVarP(&key.LogLevel, "loglevel", "l", "info", "log level [debug|info|warn|error|silent]")
+	flag.Uint32VarP(&key.MTU, "mtu", "m", 0, "set device maximum transmission unit (MTU)")
+	flag.StringVarP(&key.Proxy, "proxy", "p", "", "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.BoolVarP(&key.Version, "version", "v", false, "show version information and quit")
+	flag.Parse()
+}

 func main() {
-	app := &cli.App{
-		Usage:   About,
-		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
 }
@@ -0,0 +1,37 @@
+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 NewBase(addr string, proto proto.Proto) *Base {
+	return &Base{addr: addr, 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")
+}
@@ -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)
+}
@@ -0,0 +1,18 @@
+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)
+	}
+}
@@ -0,0 +1,24 @@
+package proto
+
+import "fmt"
+
+const (
+	Direct Proto = iota
+	Shadowsocks
+	Socks5
+)
+
+type Proto uint8
+
+func (proto Proto) String() string {
+	switch proto {
+	case Direct:
+		return "direct"
+	case Shadowsocks:
+		return "ss"
+	case Socks5:
+		return "socks5"
+	default:
+		return fmt.Sprintf("proto(%d)", proto)
+	}
+}
@@ -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)
+}
@@ -5,62 +5,79 @@ import (
 	"errors"
 	"fmt"
 	"net"
-	"net/url"
+
+	"github.com/xjasonlyu/tun2socks/component/dialer"
+	obfs "github.com/xjasonlyu/tun2socks/component/simple-obfs"
+	"github.com/xjasonlyu/tun2socks/component/socks5"
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"

 	"github.com/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 {
+		if err != nil && c != nil {
 			c.Close()
 		}
 	}()

+	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 +92,7 @@ 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 +105,9 @@ 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 +121,5 @@ 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
 }
@@ -6,13 +6,15 @@ import (
 	"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"
+	"github.com/xjasonlyu/tun2socks/component/socks5"
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
 )

+var _ Proxy = (*Socks5)(nil)
+
 type Socks5 struct {
 	*Base

@@ -20,25 +22,26 @@ type Socks5 struct {
 	pass string
 }

-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,
 	}, nil
 }

-func (ss *Socks5) DialContext(ctx context.Context, metadata *adapter.Metadata) (c net.Conn, err error) {
+func (ss *Socks5) 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 {
+		if err != nil && c != nil {
 			c.Close()
 		}
 	}()
@@ -51,25 +54,23 @@ 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) {
 	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()
 		}
 	}()
@@ -92,14 +93,14 @@ 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)
 	}

 	pc, err := dialer.ListenPacket("udp", "")
 	if err != nil {
-		return
+		return nil, fmt.Errorf("listen packet: %w", err)
 	}

 	go func() {
@@ -110,7 +111,16 @@ func (ss *Socks5) DialUDP(_ *adapter.Metadata) (_ net.PacketConn, err error) {
 		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 +132,7 @@ 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 +145,11 @@ 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 +157,7 @@ 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
@@ -1,82 +0,0 @@
-#!/bin/sh
-
-TUN="${TUN:-tun0}"
-ETH="${ETH:-eth0}"
-TUN_ADDR="${TUN_ADDR:-198.18.0.1}"
-TUN_MASK="${TUN_MASK:-255.254.0.0}"
-LOGLEVEL="${LOGLEVEL:-INFO}"
-
-mk_tun() {
-  # params
-  NAME="$1"
-  ADDR="$2"
-  MASK="$3"
-  # create tun device
-  ip tuntap add mode tun dev "$NAME"
-  ip addr add "$ADDR/$MASK" dev "$NAME"
-  ip link set dev "$NAME" up
-}
-
-config_route() {
-  # params
-  TABLE="$1"
-  TUN_IF="$2"
-  ETH_IF="$3"
-  TUN_EXCLUDED="$4"
-
-  # add custom table
-  printf "%s\t%s\n" 100 "$TABLE" >>/etc/iproute2/rt_tables
-
-  # clone main route
-  ip route show table main |
-    while read -r route; do
-      ip route add $route table "$TABLE"
-    done
-
-  # config default route
-  ip route del default table "$TABLE"
-  ip route add default dev "$TUN_IF" table "$TABLE"
-
-  # policy routing
-  tun=$(ip -4 addr show "$TUN_IF" | awk 'NR==2 {print $2}')
-  eth=$(ip -4 addr show "$ETH_IF" | awk 'NR==2 {split($2,a,"/");print a[1]}')
-  ip rule add from "$eth" to "$tun" priority 1000 prohibit
-  ip rule add from "$eth" priority 2000 table main
-  ip rule add from all priority 3000 table "$TABLE"
-
-  # add tun excluded to route
-  for addr in $(echo "$TUN_EXCLUDED" | tr ',' '\n'); do
-    ip rule add to "$addr" table main
-  done
-}
-
-main() {
-  mk_tun "$TUN" "$TUN_ADDR" "$TUN_MASK"
-  config_route "tun2socks" "$TUN" "$ETH" "$EXCLUDED"
-
-  # execute extra commands
-  if [ -n "$EXTRACMD" ]; then
-    sh -c "$EXTRACMD"
-  fi
-
-  if [ -n "$API" ]; then
-    ARGS="--api $API"
-  fi
-
-  if [ -n "$DNS" ]; then
-    ARGS="$ARGS --dns $DNS"
-  fi
-
-  for item in $(echo "$HOSTS" | tr ',' '\n'); do
-    ARGS="$ARGS --hosts $item"
-  done
-
-  exec tun2socks \
-    --loglevel "$LOGLEVEL" \
-    --interface "$ETH" \
-    --device "$TUN" \
-    --proxy "$PROXY" \
-    $ARGS
-}
-
-main || exit 1
@@ -1,4 +1,4 @@
-package api
+package stats

 import (
 	"bytes"
@@ -7,13 +7,15 @@ import (
 	"strconv"
 	"time"

+	"github.com/xjasonlyu/tun2socks/tunnel/statistic"
+
 	"github.com/go-chi/chi"
 	"github.com/go-chi/render"
 	"github.com/gorilla/websocket"
-
-	"github.com/xjasonlyu/tun2socks/internal/manager"
 )

+const defaultInterval = 1000
+
 func connectionRouter() http.Handler {
 	r := chi.NewRouter()
 	r.Get("/", getConnections)
@@ -24,7 +26,7 @@ func connectionRouter() http.Handler {

 func getConnections(w http.ResponseWriter, r *http.Request) {
 	if !websocket.IsWebSocketUpgrade(r) {
-		snapshot := manager.DefaultManager.Snapshot()
+		snapshot := statistic.DefaultManager.Snapshot()
 		render.JSON(w, r, snapshot)
 		return
 	}
@@ -35,7 +37,7 @@ func getConnections(w http.ResponseWriter, r *http.Request) {
 	}

 	intervalStr := r.URL.Query().Get("interval")
-	interval := 1000
+	interval := defaultInterval
 	if intervalStr != "" {
 		t, err := strconv.Atoi(intervalStr)
 		if err != nil {
@@ -50,7 +52,7 @@ func getConnections(w http.ResponseWriter, r *http.Request) {
 	buf := &bytes.Buffer{}
 	sendSnapshot := func() error {
 		buf.Reset()
-		snapshot := manager.DefaultManager.Snapshot()
+		snapshot := statistic.DefaultManager.Snapshot()
 		if err := json.NewEncoder(buf).Encode(snapshot); err != nil {
 			return err
 		}
@@ -73,7 +75,7 @@ func getConnections(w http.ResponseWriter, r *http.Request) {

 func closeConnection(w http.ResponseWriter, r *http.Request) {
 	id := chi.URLParam(r, "id")
-	snapshot := manager.DefaultManager.Snapshot()
+	snapshot := statistic.DefaultManager.Snapshot()
 	for _, c := range snapshot.Connections {
 		if id == c.ID() {
 			_ = c.Close()
@@ -84,7 +86,7 @@ func closeConnection(w http.ResponseWriter, r *http.Request) {
 }

 func closeAllConnections(w http.ResponseWriter, r *http.Request) {
-	snapshot := manager.DefaultManager.Snapshot()
+	snapshot := statistic.DefaultManager.Snapshot()
 	for _, c := range snapshot.Connections {
 		_ = c.Close()
 	}
@@ -0,0 +1,21 @@
+package stats
+
+var (
+	ErrUnauthorized = newError("Unauthorized")
+	ErrBadRequest   = newError("Body invalid")
+)
+
+var _ error = (*HTTPError)(nil)
+
+// 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}
+}
@@ -1,32 +1,24 @@
-package api
+package stats

 import (
 	"bytes"
 	"encoding/json"
-	"errors"
 	"net"
 	"net/http"
-	"net/url"
 	"strings"
 	"time"

+	"github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/log"
+	"github.com/xjasonlyu/tun2socks/tunnel/statistic"
+
 	"github.com/go-chi/chi"
 	"github.com/go-chi/cors"
 	"github.com/go-chi/render"
 	"github.com/gorilla/websocket"
-	"github.com/urfave/cli/v2"
-
-	"github.com/xjasonlyu/tun2socks/internal/manager"
-	"github.com/xjasonlyu/tun2socks/pkg/log"
 )

-const defaultScheme = "api"
-
 var (
-	serverApp    *cli.App
-	serverSecret = ""
-	serverAddr   = ""
-
 	upgrader = websocket.Upgrader{
 		CheckOrigin: func(r *http.Request) bool {
 			return true
@@ -34,23 +26,7 @@ var (
 	}
 )

-func Start(apiURL string, app *cli.App) error {
-	if !strings.Contains(apiURL, "://") {
-		apiURL = defaultScheme + "://" + apiURL
-	}
-
-	u, err := url.Parse(apiURL)
-	if err != nil {
-		return err
-	}
-
-	if strings.ToLower(u.Scheme) != defaultScheme {
-		return errors.New("unsupported scheme")
-	}
-	serverApp = app
-	serverAddr = u.Host
-	serverSecret = u.Query().Get("secret")
-
+func Start(addr, token string) error {
 	r := chi.NewRouter()

 	c := cors.New(cors.Options{
@@ -61,10 +37,8 @@ func Start(apiURL string, app *cli.App) error {
 	})

 	r.Use(c.Handler)
-
 	r.Group(func(r chi.Router) {
-		r.Use(authentication)
-
+		r.Use(authenticator(token))
 		r.Get("/", hello)
 		r.Get("/logs", getLogs)
 		r.Get("/traffic", traffic)
@@ -72,7 +46,7 @@ func Start(apiURL string, app *cli.App) error {
 		r.Mount("/connections", connectionRouter())
 	})

-	tcpAddr, err := net.ResolveTCPAddr("tcp", serverAddr)
+	tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
 	if err != nil {
 		return err
 	}
@@ -82,45 +56,47 @@ func Start(apiURL string, app *cli.App) error {
 		return err
 	}

-	go func() {
-		_ = http.Serve(listener, r)
-	}()
-
-	return nil
+	return http.Serve(listener, r)
 }

-func authentication(next http.Handler) http.Handler {
-	fn := func(w http.ResponseWriter, r *http.Request) {
-		if serverSecret == "" {
-			next.ServeHTTP(w, r)
-			return
-		}
+func hello(w http.ResponseWriter, r *http.Request) {
+	render.JSON(w, r, render.M{"hello": constant.Name})
+}

-		// Browser websocket not support custom header
-		if websocket.IsWebSocketUpgrade(r) && r.URL.Query().Get("token") != "" {
-			token := r.URL.Query().Get("token")
-			if token != serverSecret {
+func authenticator(token string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		fn := func(w http.ResponseWriter, r *http.Request) {
+			if token == "" {
+				next.ServeHTTP(w, r)
+				return
+			}
+
+			// Browser websocket not support custom header
+			if websocket.IsWebSocketUpgrade(r) && r.URL.Query().Get("token") != "" {
+				t := r.URL.Query().Get("token")
+				if t != token {
+					render.Status(r, http.StatusUnauthorized)
+					render.JSON(w, r, ErrUnauthorized)
+					return
+				}
+				next.ServeHTTP(w, r)
+				return
+			}
+
+			header := r.Header.Get("Authorization")
+			text := strings.SplitN(header, " ", 2)
+
+			hasInvalidHeader := text[0] != "Bearer"
+			hasInvalidToken := len(text) != 2 || text[1] != token
+			if hasInvalidHeader || hasInvalidToken {
 				render.Status(r, http.StatusUnauthorized)
 				render.JSON(w, r, ErrUnauthorized)
 				return
 			}
 			next.ServeHTTP(w, r)
-			return
 		}
-
-		header := r.Header.Get("Authorization")
-		text := strings.SplitN(header, " ", 2)
-
-		hasInvalidHeader := text[0] != "Bearer"
-		hasInvalidSecret := len(text) != 2 || text[1] != serverSecret
-		if hasInvalidHeader || hasInvalidSecret {
-			render.Status(r, http.StatusUnauthorized)
-			render.JSON(w, r, ErrUnauthorized)
-			return
-		}
-		next.ServeHTTP(w, r)
+		return http.HandlerFunc(fn)
 	}
-	return http.HandlerFunc(fn)
 }

 func getLogs(w http.ResponseWriter, r *http.Request) {
@@ -178,10 +154,6 @@ func getLogs(w http.ResponseWriter, r *http.Request) {
 	}
 }

-func hello(w http.ResponseWriter, r *http.Request) {
-	render.JSON(w, r, render.M{"hello": serverApp.Name})
-}
-
 type Traffic struct {
 	Up   int64 `json:"up"`
 	Down int64 `json:"down"`
@@ -204,7 +176,7 @@ func traffic(w http.ResponseWriter, r *http.Request) {

 	tick := time.NewTicker(time.Second)
 	defer tick.Stop()
-	t := manager.DefaultManager
+	t := statistic.DefaultManager
 	buf := &bytes.Buffer{}
 	var err error
 	for range tick.C {
@@ -231,5 +203,5 @@ func traffic(w http.ResponseWriter, r *http.Request) {
 }

 func version(w http.ResponseWriter, r *http.Request) {
-	render.JSON(w, r, render.M{"version": serverApp.Version})
+	render.JSON(w, r, render.M{"version": constant.Version})
 }
@@ -0,0 +1,4 @@
+// Package stats provides statistic data via http server.
+package stats
+
+// Ref: github.com/Dreamacro/clash/hub/route
@@ -1,4 +1,4 @@
-package manager
+package statistic

 import (
 	"sync"
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
xjasonlyu	708b7b234d	Chore: update README	2021-02-10 16:55:31 +08:00
xjasonlyu	96e0c8c390	Chore: adapt fwmark option	2021-02-10 16:40:36 +08:00
xjasonlyu	7f7f2913a8	Feature: add fwmark support	2021-02-10 15:46:55 +08:00
xjasonlyu	ea62deb0b6	Refactor: rewrite engine	2021-02-10 13:11:11 +08:00
xjasonlyu	34fb632f38	Chore: trim spaces	2021-02-09 14:16:55 +08:00
xjasonlyu	08f236a01c	Fix: lost stack log info	2021-02-08 20:23:02 +08:00
xjasonlyu	ae77a8a009	Refactor: autonomize core package	2021-02-08 20:04:51 +08:00
xjasonlyu	203e545241	Chore: update README	2021-02-08 18:55:58 +08:00
xjasonlyu	136c90d310	Chore: ignore all .md files	2021-02-08 18:32:05 +08:00
xjasonlyu	06a7cf6718	Chore: use gVisor 20210207054208-21036aed5e58	2021-02-08 16:03:16 +08:00
xjasonlyu	ab59724d87	Chore: rewrite README	2021-02-08 14:55:09 +08:00
xjasonlyu	50bed22076	Chore: Makefile rename docker -> tun2socks	2021-02-08 14:35:58 +08:00
xjasonlyu	849f47baf7	Chore: decrease maxUDPQueueSize	2021-02-07 20:43:55 +08:00
xjasonlyu	ace24826d2	Chore: move stack & device to core	2021-02-07 18:49:55 +08:00
xjasonlyu	669a601f1a	Chore: move stack & device to component	2021-02-07 18:45:52 +08:00
xjasonlyu	103009cb1d	Chore: add stack field to Engine	2021-02-07 18:38:19 +08:00
xjasonlyu	ea1832adaa	Chore: cleanup Makefile	2021-02-07 18:24:01 +08:00
xjasonlyu	cf4ac9b207	Refactor(proxy): use proto sub package	2021-02-07 18:22:00 +08:00
xjasonlyu	2fe6caab12	Chore: optimize docker files	2021-02-07 14:44:56 +08:00
xjasonlyu	6fd3fd0f8c	Chore(workflows): go add paths-ignore	2021-02-07 13:56:06 +08:00
xjasonlyu	2e0b9d5e24	Chore: update command line help messages	2021-02-07 11:31:03 +08:00
xjasonlyu	035504020e	Refactor: manager -> statistic	2021-02-07 10:54:29 +08:00
xjasonlyu	84b7c17268	Chore: use gVisor 20210207010352-2042ce9bee2d	2021-02-07 10:40:13 +08:00
xjasonlyu	ee00315894	Chore: rename proxy Type() to Proto()	2021-02-07 10:38:07 +08:00
xjasonlyu	a3ff3a5a15	Chore: const tun.Driver = "tun"	2021-02-07 10:09:26 +08:00
xjasonlyu	79aa91da41	Chore: optimize docker entrypoint.sh	2021-02-07 10:06:43 +08:00
xjasonlyu	cc268bc2a3	Feature: use wintun for windows	2021-02-06 20:01:11 +08:00
xjasonlyu	b79ab7335a	Chore: rename ShadowSocks to Shadowsocks	2021-02-06 19:01:01 +08:00
xjasonlyu	496d25ff23	Fix: panic when using direct proxy	2021-02-06 18:58:56 +08:00
xjasonlyu	9caf06760d	Chore: update engine log of proxy & device	2021-02-06 18:58:27 +08:00
xjasonlyu	a84eebe284	Chore: add Type() method to proxy.Proxy	2021-02-06 18:54:42 +08:00
xjasonlyu	6375708e4a	Chore: add Type() method to device.Device	2021-02-06 18:36:57 +08:00
xjasonlyu	e524acdb10	Optimize: rwbased link endpoint	2021-02-06 18:22:42 +08:00
xjasonlyu	6763ca4852	Chore: update stack icmp	2021-02-06 17:22:46 +08:00
xjasonlyu	b1700c62f4	Feature: windows tun more params support Supported params: - Name - MTU - ComponentID - Network	2021-02-06 16:20:45 +08:00
xjasonlyu	38b9357469	Fix: error when proxy or device empty	2021-02-06 15:40:11 +08:00
xjasonlyu	5f95bc9091	Fix: set MTU on windows	2021-02-06 15:05:21 +08:00
xjasonlyu	c04d998bb2	Chore: adjust .dockerignore	2021-02-06 14:03:55 +08:00
xjasonlyu	e0956ce58c	Feature: add simple-obfs support for ss	2021-02-06 13:41:44 +08:00
xjasonlyu	44e47cc86c	Fix: replace outdated params	2021-02-06 12:14:10 +08:00
xjasonlyu	441e6c3dfb	Chore: update gVisor	2021-02-06 12:11:06 +08:00
xjasonlyu	26c1bfc461	Chore: adjust docker env params	2021-02-06 11:50:33 +08:00
xjasonlyu	93c739d2d9	Chore: use strict log level	2021-02-06 11:46:35 +08:00
xjasonlyu	aa703ac90d	Chore: rename secret to token	2021-02-06 11:39:25 +08:00
xjasonlyu	d1df910888	Chore: adjust workflows	2021-02-06 11:30:14 +08:00
Jason LyuandGitHub	fd00cfe08d	License: GPL 3.0	2021-02-05 20:16:54 +08:00
xjasonlyu	158ccf63be	fix: Dockerfile RUN before COPY	2021-02-05 20:05:50 +08:00
xjasonlyu	90d7d2dfe6	Refactor	2021-02-05 20:02:29 +08:00
xjasonlyu	60d61eee7a	fix: https://github.com/xjasonlyu/tun2socks/issues/22	2020-11-19 11:07:55 +08:00
xjasonlyu	fcf9d280b8	fix: ipv6 connect error	2020-11-09 21:19:44 +08:00
xjasonlyu	f18362714d	rm docker folder	2020-11-09 14:15:30 +08:00
xjasonlyu	95dc93cb41	improve: core udp	2020-11-09 10:33:55 +08:00
xjasonlyu	d42cf2ceb5	freebsd/openbsd support (experimental)	2020-11-08 21:39:55 +08:00
xjasonlyu	25749c7596	add macos usage	2020-11-08 16:47:45 +08:00
xjasonlyu	2835cfae75	adjust: udpBufferSize	2020-11-08 15:54:23 +08:00
xjasonlyu	0e2d98b951	chore: rwc	2020-11-08 15:01:33 +08:00
xjasonlyu	b435fbc51a	use unix getMTU	2020-11-08 14:12:00 +08:00
xjasonlyu	b858c8758a	readme	2020-11-08 13:50:31 +08:00
xjasonlyu	08674e64af	mod: update	2020-11-08 12:14:36 +08:00
xjasonlyu	3b641119db	adjust actions	2020-11-08 12:00:41 +08:00
xjasonlyu	8c7075050c	fix: empty version	2020-11-08 11:37:35 +08:00
xjasonlyu	ca7d161f58	add .dockerignore	2020-11-08 00:15:17 +08:00
xjasonlyu	f559f9bd3c	fix: trim linkdown	2020-11-07 20:51:48 +08:00