mirror of
https://github.com/xjasonlyu/tun2socks.git
synced 2025-10-06 01:07:03 +08:00
81 lines
1.8 KiB
Go
81 lines
1.8 KiB
Go
package tunnel
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import (
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"io"
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"net"
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"sync"
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"time"
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"github.com/xjasonlyu/tun2socks/v2/common/pool"
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"github.com/xjasonlyu/tun2socks/v2/core"
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"github.com/xjasonlyu/tun2socks/v2/log"
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M "github.com/xjasonlyu/tun2socks/v2/metadata"
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"github.com/xjasonlyu/tun2socks/v2/proxy"
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"github.com/xjasonlyu/tun2socks/v2/tunnel/statistic"
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)
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const (
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tcpWaitTimeout = 5 * time.Second
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)
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func newTCPTracker(conn net.Conn, metadata *M.Metadata) net.Conn {
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return statistic.NewTCPTracker(conn, metadata, statistic.DefaultManager)
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}
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func handleTCPConn(localConn core.TCPConn) {
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defer localConn.Close()
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var (
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srcIP, srcPort = parseAddr(localConn.RemoteAddr())
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dstIP, dstPort = parseAddr(localConn.LocalAddr())
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)
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metadata := &M.Metadata{
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Network: M.TCP,
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SrcIP: srcIP,
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SrcPort: srcPort,
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DstIP: dstIP,
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DstPort: dstPort,
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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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metadata.MidIP, metadata.MidPort = parseAddr(targetConn.LocalAddr())
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targetConn = 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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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(pool.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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