Ejemplo n.º 1
0
func (c *UDPConn) writeUDPClient(dgram *gosocks5.UDPDatagram) error {
	if c.udp != nil {
		dgram.Header.Rsv = 0
		buffer := bytes.Buffer{}
		dgram.Write(&buffer)
		_, err := c.udp.WriteTo(buffer.Bytes(), c.addr)
		return err
	}

	dgram.Header.Rsv = uint16(len(dgram.Data))
	return dgram.Write(c.tcp)
}
Ejemplo n.º 2
0
func (c *UDPConn) writeUDPServer(dgram *gosocks5.UDPDatagram) error {
	if c.udp != nil {
		addr, err := net.ResolveUDPAddr("udp", dgram.Header.Addr.String())
		if err != nil {
			glog.V(LWARNING).Infoln(err)
			return nil // drop silently
		}
		_, err = c.udp.WriteTo(dgram.Data, addr)
		return err
	}
	dgram.Header.Rsv = uint16(len(dgram.Data))
	return dgram.Write(c.tcp)
}
Ejemplo n.º 3
0
func (s *Socks5Server) tunnelUDP(uc *net.UDPConn, cc net.Conn, client bool) (err error) {
	errc := make(chan error, 2)

	var clientAddr *net.UDPAddr

	go func() {
		b := make([]byte, LargeBufferSize)

		for {
			n, addr, err := uc.ReadFromUDP(b)
			if err != nil {
				errc <- err
				return
			}

			var dgram *gosocks5.UDPDatagram
			if client { // pipe from relay to tunnel
				dgram, err = gosocks5.ReadUDPDatagram(bytes.NewReader(b[:n]))
				if err != nil {
					errc <- err
					return
				}
				if clientAddr == nil {
					clientAddr = addr
				}
				dgram.Header.Rsv = uint16(len(dgram.Data))
				if err := dgram.Write(cc); err != nil {
					errc <- err
					return
				}
				glog.V(LDEBUG).Infof("[udp-tun] %s >>> %s length: %d", uc.LocalAddr(), dgram.Header.Addr, len(dgram.Data))
			} else { // pipe from peer to tunnel
				dgram = gosocks5.NewUDPDatagram(
					gosocks5.NewUDPHeader(uint16(n), 0, ToSocksAddr(addr)), b[:n])
				if err := dgram.Write(cc); err != nil {
					errc <- err
					return
				}
				glog.V(LDEBUG).Infof("[udp-tun] %s <<< %s length: %d", cc.RemoteAddr(), dgram.Header.Addr, len(dgram.Data))
			}
		}
	}()

	go func() {
		for {
			dgram, err := gosocks5.ReadUDPDatagram(cc)
			if err != nil {
				errc <- err
				return
			}

			if client { // pipe from tunnel to relay
				if clientAddr == nil {
					continue
				}
				dgram.Header.Rsv = 0

				buf := bytes.Buffer{}
				dgram.Write(&buf)
				if _, err := uc.WriteToUDP(buf.Bytes(), clientAddr); err != nil {
					errc <- err
					return
				}
				glog.V(LDEBUG).Infof("[udp-tun] %s <<< %s length: %d", uc.LocalAddr(), dgram.Header.Addr, len(dgram.Data))
			} else { // pipe from tunnel to peer
				addr, err := net.ResolveUDPAddr("udp", dgram.Header.Addr.String())
				if err != nil {
					continue // drop silently
				}
				if _, err := uc.WriteToUDP(dgram.Data, addr); err != nil {
					errc <- err
					return
				}
				glog.V(LDEBUG).Infof("[udp-tun] %s >>> %s length: %d", cc.RemoteAddr(), addr, len(dgram.Data))
			}
		}
	}()

	select {
	case err = <-errc:
	}

	return
}