ready to go

.github/workflows/go.yml

@@ -0,0 +1,54 @@
+name: Go
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'
+
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15.x
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Cache go module
+        uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Get dependencies, run test and static check
+        run: |
+          go test ./...
+          go vet ./...
+          go get -u honnef.co/go/tools/cmd/staticcheck
+          staticcheck -- $(go list ./...)
+
+      - name: Build
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          DIR: bin
+          NAME: tun2socks
+        run: make -j releases
+
+      - name: Upload Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: bin/*
+          draft: true
+          prerelease: true

README.md

@@ -1,3 +1,74 @@
 # tun2socks
 
+![build](https://img.shields.io/github/workflow/status/xjasonlyu/tun2socks/Go?style=flat-square)
+![go report](https://goreportcard.com/badge/github.com/xjasonlyu/tun2socks?style=flat-square)
+![license](https://img.shields.io/github/license/xjasonlyu/tun2socks?style=flat-square)
+![release](https://img.shields.io/github/v/release/xjasonlyu/tun2socks.svg?include_prereleases&style=flat-square)
+
 A tun2socks implementation written in Go.
+
+## Features
+
+- External RESTful API support
+- Fake DNS with manual hosts support
+- IPv4/IPv6 support
+- Optimized UDP transmission for game acceleration
+- Pure Go implementation, no CGO required
+- Socks5, Shadowsocks protocol support for remote connections
+- TCP/IP stack powered by [gVisor](https://github.com/google/gvisor)
+- Up to 2.5Gbps throughput (10x faster than [v1](https://github.com/xjasonlyu/tun2socks/tree/v1))
+
+### Requirements
+
+| Target | Minimum | Recommended |
+| --- | --- | --- |
+| System | linux darwin | linux |
+| Memory | >20MB | +∞ |
+| CPU | ANY | amd64 arm64 |
+
+## QuickStart
+
+Download from precompiled [Releases](https://github.com/xjasonlyu/tun2socks/releases).
+
+create tun
+
+```shell script
+ip tuntap add mode tun dev tun0
+ip addr add 198.18.0.1/15 dev tun0
+ip link set dev tun0 up
+```
+
+run
+
+```shell script
+./tun2socks --loglevel WARN --device tun://tun0 --proxy socks5://server:port --interface eth0
+```
+
+or just
+
+```shell script
+PROXY=socks5://server:port LOGLEVEL=WARN sh ./scripts/entrypoint.sh
+```
+
+## Build from source
+
+```text
+$ git clone https://github.com/xjasonlyu/tun2socks.git
+$ cd tun2socks
+$ make
+```
+
+## Issues
+
+Due to the implementation of pure Go, the memory usage is higher than the previous version.
+If you are memory sensitive, please go back to [v1](https://github.com/xjasonlyu/tun2socks/tree/v1).
+
+## TODO
+
+- [ ] Windows support
+
+## Credits
+
+- [Dreamacro/clash](https://github.com/Dreamacro/clash)
+- [google/gvisor](https://github.com/google/gvisor)
+- [majek/slirpnetstack](https://github.com/majek/slirpnetstack)

internal/dev/tun/tun_linux.go

@@ -19,6 +19,9 @@ func (f closeFunc) Close() error {
 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)