mirror of
https://github.com/xjasonlyu/tun2socks.git
synced 2025-10-10 11:10:17 +08:00
87 lines
2.0 KiB
Go
87 lines
2.0 KiB
Go
package tunnel
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import (
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"io"
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"net"
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"strconv"
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"sync"
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"time"
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"github.com/xjasonlyu/clash/common/pool"
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"github.com/xjasonlyu/tun2socks/internal/adapter"
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"github.com/xjasonlyu/tun2socks/internal/manager"
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"github.com/xjasonlyu/tun2socks/internal/proxy"
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"github.com/xjasonlyu/tun2socks/pkg/log"
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)
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const (
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tcpWaitTimeout = 5 * time.Second
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relayBufferSize = pool.RelayBufferSize
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)
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func handleTCP(localConn adapter.TCPConn) {
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defer localConn.Close()
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metadata := localConn.Metadata()
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if !metadata.Valid() {
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log.Warnf("[Metadata] not valid: %#v", metadata)
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return
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}
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err := resolveMetadata(metadata)
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if err != nil {
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log.Warnf("[Metadata] resolve metadata error: %v", err)
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return
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}
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targetConn, err := proxy.Dial(metadata)
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if err != nil {
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log.Warnf("[TCP] dial %s error: %v", metadata.DestinationAddress(), err)
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return
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}
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if dialerAddr, ok := targetConn.LocalAddr().(*net.TCPAddr); ok {
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metadata.MidIP = dialerAddr.IP
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metadata.MidPort = uint16(dialerAddr.Port)
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} else {
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ip, p, _ := net.SplitHostPort(targetConn.LocalAddr().String())
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port, _ := strconv.ParseUint(p, 10, 16)
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metadata.MidIP = net.ParseIP(ip)
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metadata.MidPort = uint16(port)
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}
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targetConn = manager.NewTCPTracker(targetConn, metadata)
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defer targetConn.Close()
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log.Infof("[TCP] %s <--> %s", metadata.SourceAddress(), metadata.DestinationAddress())
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relay(localConn, targetConn) /* relay connections */
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}
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// relay copies between left and right bidirectionally.
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func relay(left, right net.Conn) {
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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defer wg.Done()
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_ = copyBuffer(right, left) /* ignore error */
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right.SetReadDeadline(time.Now().Add(tcpWaitTimeout))
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}()
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go func() {
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defer wg.Done()
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_ = copyBuffer(left, right) /* ignore error */
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left.SetReadDeadline(time.Now().Add(tcpWaitTimeout))
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}()
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wg.Wait()
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}
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func copyBuffer(dst io.Writer, src io.Reader) error {
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buf := pool.Get(relayBufferSize)
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defer pool.Put(buf)
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_, err := io.CopyBuffer(dst, src, buf)
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return err
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}
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