157 lines
3.5 KiB
Go
157 lines
3.5 KiB
Go
package v5
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import (
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"context"
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"net"
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"time"
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"github.com/go-gost/gosocks5"
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"github.com/go-gost/gost/pkg/handler"
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"github.com/go-gost/gost/pkg/internal/utils/mux"
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"github.com/go-gost/gost/pkg/logger"
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)
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func (h *socks5Handler) handleMuxBind(ctx context.Context, conn net.Conn, req *gosocks5.Request) {
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addr := req.Addr.String()
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h.logger = h.logger.WithFields(map[string]interface{}{
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"dst": addr,
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"cmd": "mbind",
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})
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h.logger.Infof("%s >> %s", conn.RemoteAddr(), addr)
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if h.chain.IsEmpty() {
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h.muxBindLocal(ctx, conn, addr)
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return
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}
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r := (&handler.Router{}).
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WithChain(h.chain).
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WithRetry(h.md.retryCount).
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WithLogger(h.logger)
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cc, err := r.Connect(ctx)
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if err != nil {
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resp := gosocks5.NewReply(gosocks5.Failure, nil)
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resp.Write(conn)
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if h.logger.IsLevelEnabled(logger.DebugLevel) {
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h.logger.Debug(resp)
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}
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return
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}
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defer cc.Close()
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// forward request
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if err := req.Write(cc); err != nil {
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h.logger.Error(err)
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resp := gosocks5.NewReply(gosocks5.NetUnreachable, nil)
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resp.Write(conn)
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if h.logger.IsLevelEnabled(logger.DebugLevel) {
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h.logger.Debug(resp)
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}
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return
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}
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t := time.Now()
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h.logger.Infof("%s <-> %s", conn.RemoteAddr(), addr)
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handler.Transport(conn, cc)
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h.logger.
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WithFields(map[string]interface{}{
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"duration": time.Since(t),
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}).
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Infof("%s >-< %s", conn.RemoteAddr(), addr)
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}
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func (h *socks5Handler) muxBindLocal(ctx context.Context, conn net.Conn, addr string) {
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bindAddr, _ := net.ResolveTCPAddr("tcp", addr)
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ln, err := net.ListenTCP("tcp", bindAddr) // strict mode: if the port already in use, it will return error
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if err != nil {
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h.logger.Error(err)
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reply := gosocks5.NewReply(gosocks5.Failure, nil)
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if err := reply.Write(conn); err != nil {
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h.logger.Error(err)
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}
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if h.logger.IsLevelEnabled(logger.DebugLevel) {
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h.logger.Debug(reply.String())
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}
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return
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}
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socksAddr, err := gosocks5.NewAddr(ln.Addr().String())
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if err != nil {
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h.logger.Warn(err)
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socksAddr = &gosocks5.Addr{
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Type: gosocks5.AddrIPv4,
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}
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}
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// Issue: may not reachable when host has multi-interface
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socksAddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
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socksAddr.Type = 0
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reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)
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if err := reply.Write(conn); err != nil {
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h.logger.Error(err)
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ln.Close()
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return
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}
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if h.logger.IsLevelEnabled(logger.DebugLevel) {
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h.logger.Debug(reply.String())
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}
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h.logger = h.logger.WithFields(map[string]interface{}{
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"bind": socksAddr.String(),
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})
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h.logger.Infof("bind on: %s OK", socksAddr.String())
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h.serveMuxBind(ctx, conn, ln)
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}
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func (h *socks5Handler) serveMuxBind(ctx context.Context, conn net.Conn, ln net.Listener) {
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// Upgrade connection to multiplex stream.
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session, err := mux.NewMuxSession(conn)
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if err != nil {
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h.logger.Error(err)
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return
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}
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defer session.Close()
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go func() {
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defer ln.Close()
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for {
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conn, err := session.Accept()
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if err != nil {
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h.logger.Error(err)
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return
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}
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conn.Close() // we do not handle incoming connections.
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}
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}()
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for {
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rc, err := ln.Accept()
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if err != nil {
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h.logger.Error(err)
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return
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}
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h.logger.Infof("peer accepted: %s", rc.RemoteAddr().String())
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go func(c net.Conn) {
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defer c.Close()
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sc, err := session.GetConn()
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if err != nil {
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h.logger.Error(err)
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return
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}
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defer sc.Close()
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t := time.Now()
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h.logger.Infof("%s <-> %s", conn.RemoteAddr(), c.RemoteAddr().String())
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handler.Transport(sc, c)
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h.logger.
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WithFields(map[string]interface{}{"duration": time.Since(t)}).
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Infof("%s >-< %s", conn.RemoteAddr(), c.RemoteAddr().String())
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}(rc)
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}
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}
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