ci: add GitHub Actions checks (#25)

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    env:
+      CGO_ENABLED: "0"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Check formatting
+        run: |
+          test -z "$(gofmt -l .)"
+
+      - name: Run go vet
+        run: go vet ./...
+
+      - name: Run tests
+        run: go test ./...
+
+      - name: Run staticcheck
+        run: |
+          go install honnef.co/go/tools/cmd/staticcheck@latest
+          staticcheck ./...

client.go

@@ -12,11 +12,6 @@ import (
 	"sync"
 )
 
-type TcpClient struct {
-	conn   *net.TCPConn
-	server *net.TCPAddr
-}
-
 func handleProxyRequest(localClient *net.TCPConn, serverAddr *net.TCPAddr, auth socks5Auth, recvHTTPProto string) error {
 
 	// 远程连接IO
@@ -105,7 +100,7 @@ func handleProxyRequest(localClient *net.TCPConn, serverAddr *net.TCPAddr, auth
 		binary.Write(dstPortBuff, binary.BigEndian, dstPortInt)
 		dstPortBytes := dstPortBuff.Bytes() // int为8字节
 		resp = append(resp, dstPortBytes[len(dstPortBytes)-2:]...)
-		n, err = auth.EncodeWrite(dstServer, resp)
+		_, err = auth.EncodeWrite(dstServer, resp)
 		if err != nil {
 			return err
 		}

socks5.go

@@ -53,7 +53,7 @@ func (s *ProtocolVersion) HandleHandshake(b []byte) ([]byte, error) {
 	}
 	s.VER = b[0] //ReadByte reads and returns a single byte，第一个参数为socks的版本号
 	if s.VER != 0x05 {
-		return nil, errors.New("协议错误, version版本不为5!")
+		return nil, errors.New("协议错误, version版本不为5")
 	}
 	s.NMETHODS = b[1] //nmethods是记录methods的长度的。nmethods的长度是1个字节
 	if n != int(2+s.NMETHODS) {
@@ -196,7 +196,7 @@ func (s *Socks5Resolution) LSTRequest(b []byte) ([]byte, error) {
 
 	s.CMD = b[1]
 	if s.CMD != 1 {
-		return nil, errors.New("客户端请求类型不为代理连接, 其他功能暂时不支持.")
+		return nil, errors.New("客户端请求类型不为代理连接, 其他功能暂时不支持")
 	}
 	s.RSV = b[2] //RSV保留字端，值长度为1个字节