145 lines
3.1 KiB
Go
145 lines
3.1 KiB
Go
package v5
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import (
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"context"
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"fmt"
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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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)
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func (h *socks5Handler) handleBind(ctx context.Context, conn net.Conn, network, address string) {
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h.logger = h.logger.WithFields(map[string]interface{}{
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"dst": fmt.Sprintf("%s/%s", address, network),
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"cmd": "bind",
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})
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h.logger.Infof("%s >> %s", conn.RemoteAddr(), address)
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if !h.md.enableBind {
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reply := gosocks5.NewReply(gosocks5.NotAllowed, nil)
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reply.Write(conn)
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h.logger.Debug(reply)
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h.logger.Error("BIND is diabled")
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return
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}
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// BIND does not support chain.
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h.bindLocal(ctx, conn, network, address)
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}
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func (h *socks5Handler) bindLocal(ctx context.Context, conn net.Conn, network, address string) {
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ln, err := net.Listen(network, address) // 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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h.logger.Debug(reply)
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return
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}
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socksAddr := gosocks5.Addr{}
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if err := socksAddr.ParseFrom(ln.Addr().String()); err != nil {
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h.logger.Warn(err)
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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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h.logger.Debug(reply)
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h.logger = h.logger.WithFields(map[string]interface{}{
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"bind": fmt.Sprintf("%s/%s", ln.Addr(), ln.Addr().Network()),
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})
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h.logger.Debugf("bind on %s OK", ln.Addr())
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h.serveBind(ctx, conn, ln)
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}
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func (h *socks5Handler) serveBind(ctx context.Context, conn net.Conn, ln net.Listener) {
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var rc net.Conn
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accept := func() <-chan error {
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errc := make(chan error, 1)
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go func() {
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defer close(errc)
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defer ln.Close()
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c, err := ln.Accept()
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if err != nil {
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errc <- err
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}
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rc = c
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}()
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return errc
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}
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pc1, pc2 := net.Pipe()
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pipe := func() <-chan error {
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errc := make(chan error, 1)
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go func() {
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defer close(errc)
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defer pc1.Close()
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errc <- handler.Transport(conn, pc1)
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}()
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return errc
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}
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defer pc2.Close()
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select {
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case err := <-accept():
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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(pc2); err != nil {
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h.logger.Error(err)
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}
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h.logger.Debug(reply)
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return
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}
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defer rc.Close()
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h.logger.Debugf("peer %s accepted", rc.RemoteAddr())
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raddr := gosocks5.Addr{}
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raddr.ParseFrom(rc.RemoteAddr().String())
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reply := gosocks5.NewReply(gosocks5.Succeeded, &raddr)
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if err := reply.Write(pc2); err != nil {
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h.logger.Error(err)
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}
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h.logger.Debug(reply)
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start := time.Now()
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h.logger.Infof("%s <-> %s", conn.RemoteAddr(), raddr.String())
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handler.Transport(pc2, rc)
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h.logger.
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WithFields(map[string]interface{}{"duration": time.Since(start)}).
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Infof("%s >-< %s", conn.RemoteAddr(), raddr.String())
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case err := <-pipe():
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if err != nil {
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h.logger.Error(err)
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}
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ln.Close()
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return
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}
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}
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