Ejemplo n.º 1
0
func (s *RTcpForwardServer) connectRTcpForward(conn net.Conn, laddr, raddr net.Addr) error {
	glog.V(LINFO).Infof("[rtcp] %s - %s", laddr, raddr)

	req := gosocks5.NewRequest(gosocks5.CmdBind, ToSocksAddr(laddr))
	if err := req.Write(conn); err != nil {
		glog.V(LWARNING).Infof("[rtcp] %s -> %s : %s", laddr, raddr, err)
		return err
	}

	// first reply, bind status
	conn.SetReadDeadline(time.Now().Add(ReadTimeout))
	rep, err := gosocks5.ReadReply(conn)
	if err != nil {
		glog.V(LWARNING).Infof("[rtcp] %s -> %s : %s", laddr, raddr, err)
		return err
	}
	conn.SetReadDeadline(time.Time{})
	if rep.Rep != gosocks5.Succeeded {
		glog.V(LWARNING).Infof("[rtcp] %s -> %s : bind on %s failure", laddr, raddr, laddr)
		return errors.New("Bind on " + laddr.String() + " failure")
	}
	glog.V(LINFO).Infof("[rtcp] %s - %s BIND ON %s OK", laddr, raddr, rep.Addr)

	// second reply, peer connection
	rep, err = gosocks5.ReadReply(conn)
	if err != nil {
		glog.V(LWARNING).Infof("[rtcp] %s -> %s : %s", laddr, raddr, err)
		return err
	}
	if rep.Rep != gosocks5.Succeeded {
		glog.V(LWARNING).Infof("[rtcp] %s -> %s : peer connect failure", laddr, raddr)
		return errors.New("peer connect failure")
	}

	glog.V(LINFO).Infof("[rtcp] %s -> %s PEER %s CONNECTED", laddr, raddr, rep.Addr)

	go func() {
		defer conn.Close()

		lconn, err := net.DialTimeout("tcp", raddr.String(), time.Second*180)
		if err != nil {
			glog.V(LWARNING).Infof("[rtcp] %s -> %s : %s", rep.Addr, raddr, err)
			return
		}
		defer lconn.Close()

		glog.V(LINFO).Infof("[rtcp] %s <-> %s", rep.Addr, lconn.RemoteAddr())
		s.Base.transport(lconn, conn)
		glog.V(LINFO).Infof("[rtcp] %s >-< %s", rep.Addr, lconn.RemoteAddr())
	}()

	return nil
}
Ejemplo n.º 2
0
func (s *UdpForwardServer) prepareUdpConnectTunnel(addr net.Addr) (net.Conn, error) {
	conn, err := s.Base.Chain.GetConn()
	if err != nil {
		return nil, err
	}

	conn.SetWriteDeadline(time.Now().Add(WriteTimeout))
	if err = gosocks5.NewRequest(CmdUdpConnect, ToSocksAddr(addr)).Write(conn); err != nil {
		conn.Close()
		return nil, err
	}
	conn.SetWriteDeadline(time.Time{})

	conn.SetReadDeadline(time.Now().Add(ReadTimeout))
	reply, err := gosocks5.ReadReply(conn)
	if err != nil {
		conn.Close()
		return nil, err
	}
	conn.SetReadDeadline(time.Time{})

	if reply.Rep != gosocks5.Succeeded {
		conn.Close()
		return nil, errors.New("failure")
	}

	return conn, nil
}
Ejemplo n.º 3
0
func handleSocks5(conn net.Conn, methods []uint8) {
	if err := selectMethod(conn, methods...); err != nil {
		log.Println(err)
		return
	}

	req, err := gosocks5.ReadRequest(conn)
	if err != nil {
		return
	}

	//log.Println(req)
	sconn, err := makeTunnel()
	if err != nil {
		gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
		log.Println(err)
		return
	}
	defer sconn.Close()

	switch req.Cmd {
	case gosocks5.CmdConnect, gosocks5.CmdBind:
		if err := req.Write(sconn); err != nil {
			return
		}
		Transport(conn, sconn)
	case gosocks5.CmdUdp:
		if err := req.Write(sconn); err != nil {
			return
		}
		rep, err := gosocks5.ReadReply(sconn)
		if err != nil || rep.Rep != gosocks5.Succeeded {
			return
		}

		uconn, err := net.ListenUDP("udp", nil)
		if err != nil {
			log.Println(err)
			gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
			return
		}
		defer uconn.Close()

		addr := ToSocksAddr(uconn.LocalAddr())
		addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
		log.Println("udp:", addr)

		rep = gosocks5.NewReply(gosocks5.Succeeded, addr)
		if err := rep.Write(conn); err != nil {
			log.Println(err)
			return
		}

		go cliTunnelUDP(uconn, sconn)

		// block, waiting for client exit
		ioutil.ReadAll(conn)
	}
}
Ejemplo n.º 4
0
func connectSocks5Proxy(addr string) (conn net.Conn, err error) {
	conn, err = dial(proxyURL.Host)
	if err != nil {
		return
	}

	conf := &gosocks5.Config{
		// Methods:        []uint8{gosocks5.MethodNoAuth, gosocks5.MethodUserPass},
		MethodSelected: proxyMethodSelected,
	}
	if proxyURL.User != nil {
		conf.Methods = []uint8{gosocks5.MethodUserPass}
	}

	c := gosocks5.ClientConn(conn, conf)
	if err := c.Handleshake(); err != nil {
		conn.Close()
		return nil, err
	}
	conn = c

	s := strings.Split(addr, ":")
	host := s[0]
	port := 80
	if len(s) == 2 {
		n, _ := strconv.ParseUint(s[1], 10, 16)
		port = int(n)
	}
	a := &gosocks5.Addr{
		Type: gosocks5.AddrDomain,
		Host: host,
		Port: uint16(port),
	}
	if err := gosocks5.NewRequest(gosocks5.CmdConnect, a).Write(conn); err != nil {
		conn.Close()
		return nil, err
	}
	rep, err := gosocks5.ReadReply(conn)
	if err != nil {
		conn.Close()
		return nil, err
	}
	if rep.Rep != gosocks5.Succeeded {
		conn.Close()
		return nil, errors.New("Socks Failture")
	}

	return conn, nil
}
Ejemplo n.º 5
0
func requestSocks5(conn net.Conn, req *gosocks5.Request) (*gosocks5.Reply, error) {
	if err := req.Write(conn); err != nil {
		return nil, err
	}
	if glog.V(LDEBUG) {
		glog.Infoln(req.String())
	}
	rep, err := gosocks5.ReadReply(conn)
	if err != nil {
		return nil, err
	}
	if glog.V(LDEBUG) {
		glog.Infoln(rep.String())
	}
	return rep, nil
}
Ejemplo n.º 6
0
func peekReply(dst io.Writer, src io.Reader) (rep *gosocks5.Reply, err error) {
	rep, err = gosocks5.ReadReply(src)
	if err != nil {
		glog.V(LWARNING).Infoln(err)
		rep = gosocks5.NewReply(gosocks5.Failure, nil)
	}
	if err = rep.Write(dst); err != nil {
		return
	}
	glog.V(LDEBUG).Infoln(rep)

	if rep.Rep != gosocks5.Succeeded {
		err = errors.New("Failure")
	}

	return
}
Ejemplo n.º 7
0
func createServerConn(uconn *net.UDPConn, addr net.Addr) (c *UDPConn, err error) {
	if len(forwardArgs) == 0 {
		c = Server(uconn)
		return
	}

	fconn, _, err := forwardChain(forwardArgs...)
	if err != nil {
		if fconn != nil {
			fconn.Close()
		}
		return
	}
	glog.V(LINFO).Infoln("forward udp associate")

	req := gosocks5.NewRequest(gosocks5.CmdUdp, nil)
	if err = req.Write(fconn); err != nil {
		fconn.Close()
		return
	}
	glog.V(LDEBUG).Infoln(req)

	rep, err := gosocks5.ReadReply(fconn)
	if err != nil {
		fconn.Close()
		return
	}
	glog.V(LDEBUG).Infoln(rep)
	if rep.Rep != gosocks5.Succeeded {
		fconn.Close()
		return nil, errors.New("Failure")
	}
	glog.V(LINFO).Infoln("forward udp associate, on", rep.Addr, "OK")

	c = Server(fconn)
	return
}
Ejemplo n.º 8
0
func handleShadow(conn net.Conn) {
	addr, extra, err := getShadowRequest(conn)
	if err != nil {
		log.Println(err)
		return
	}

	sconn, err := makeTunnel()
	if err != nil {
		log.Println(err)
		return
	}
	defer sconn.Close()

	req := gosocks5.NewRequest(gosocks5.CmdConnect, addr)
	if err := req.Write(sconn); err != nil {
		log.Println(err)
		return
	}
	rep, err := gosocks5.ReadReply(sconn)
	if err != nil || rep.Rep != gosocks5.Succeeded {
		log.Println(err)
		return
	}

	if extra != nil {
		if _, err := sconn.Write(extra); err != nil {
			log.Println(err)
			return
		}
	}

	if err := Transport(conn, sconn); err != nil {
		//log.Println(err)
	}
}
Ejemplo n.º 9
0
func (s *Socks5Server) handleUDPRelay(req *gosocks5.Request) {
	bindAddr, _ := net.ResolveUDPAddr("udp", req.Addr.String())
	relay, err := net.ListenUDP("udp", bindAddr) // udp associate, strict mode: if the port already in use, it will return error
	if err != nil {
		glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), req.Addr, err)
		reply := gosocks5.NewReply(gosocks5.Failure, nil)
		reply.Write(s.conn)
		glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", s.conn.RemoteAddr(), req.Addr, reply)
		return
	}
	defer relay.Close()

	socksAddr := ToSocksAddr(relay.LocalAddr())
	socksAddr.Host, _, _ = net.SplitHostPort(s.conn.LocalAddr().String())
	reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)
	if err := reply.Write(s.conn); err != nil {
		glog.V(LWARNING).Infof("[socks5-udp] %s <- %s : %s", s.conn.RemoteAddr(), req.Addr, err)
		return
	}
	glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", s.conn.RemoteAddr(), reply.Addr, reply)
	glog.V(LINFO).Infof("[socks5-udp] %s - %s BIND ON %s OK", s.conn.RemoteAddr(), req.Addr, socksAddr)

	cc, err := s.Base.Chain.GetConn()
	// connection error
	if err != nil && err != ErrEmptyChain {
		glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), socksAddr, err)
		return
	}

	// serve as standard socks5 udp relay local <-> remote
	if err == ErrEmptyChain {
		peer, er := net.ListenUDP("udp", nil)
		if er != nil {
			glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), socksAddr, er)
			return
		}
		defer peer.Close()

		go s.transportUDP(relay, peer)
	}

	// forward udp local <-> tunnel
	if err == nil {
		defer cc.Close()

		cc.SetWriteDeadline(time.Now().Add(WriteTimeout))
		req := gosocks5.NewRequest(CmdUdpTun, nil)
		if err := req.Write(cc); err != nil {
			glog.V(LWARNING).Infoln("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), cc.RemoteAddr(), err)
			return
		}
		cc.SetWriteDeadline(time.Time{})
		glog.V(LDEBUG).Infof("[socks5-udp] %s -> %s\n%s", s.conn.RemoteAddr(), cc.RemoteAddr(), req)

		cc.SetReadDeadline(time.Now().Add(ReadTimeout))
		reply, err = gosocks5.ReadReply(cc)
		if err != nil {
			glog.V(LWARNING).Infoln("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), cc.RemoteAddr(), err)
			return
		}
		glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", s.conn.RemoteAddr(), cc.RemoteAddr(), reply)

		if reply.Rep != gosocks5.Succeeded {
			glog.V(LWARNING).Infoln("[socks5-udp] %s <- %s : udp associate failed", s.conn.RemoteAddr(), cc.RemoteAddr())
			return
		}
		cc.SetReadDeadline(time.Time{})
		glog.V(LINFO).Infof("[socks5-udp] %s <-> %s [tun: %s]", s.conn.RemoteAddr(), socksAddr, reply.Addr)

		go s.tunnelUDP(relay, cc, true)
	}

	glog.V(LINFO).Infof("[socks5-udp] %s <-> %s", s.conn.RemoteAddr(), socksAddr)
	b := make([]byte, SmallBufferSize)
	for {
		_, err := s.conn.Read(b) // discard any data from tcp connection
		if err != nil {
			glog.V(LWARNING).Infof("[socks5-udp] %s - %s : %s", s.conn.RemoteAddr(), socksAddr, err)
			break // client disconnected
		}
	}
	glog.V(LINFO).Infof("[socks5-udp] %s >-< %s", s.conn.RemoteAddr(), socksAddr)
}
Ejemplo n.º 10
0
// Connect connect to addr through this proxy node
func (c *ProxyConn) Connect(addr string) error {
	switch c.Node.Protocol {
	case "ss": // shadowsocks
		host, port, err := net.SplitHostPort(addr)
		if err != nil {
			return err
		}
		p, _ := strconv.Atoi(port)
		req := gosocks5.NewRequest(gosocks5.CmdConnect, &gosocks5.Addr{
			Type: gosocks5.AddrDomain,
			Host: host,
			Port: uint16(p),
		})
		buf := bytes.Buffer{}
		if err := req.Write(&buf); err != nil {
			return err
		}
		b := buf.Bytes()
		if _, err := c.Write(b[3:]); err != nil {
			return err
		}

		glog.V(LDEBUG).Infoln("[ss]", req)
	case "socks", "socks5":
		host, port, err := net.SplitHostPort(addr)
		if err != nil {
			return err
		}
		p, _ := strconv.Atoi(port)
		req := gosocks5.NewRequest(gosocks5.CmdConnect, &gosocks5.Addr{
			Type: gosocks5.AddrDomain,
			Host: host,
			Port: uint16(p),
		})
		if err := req.Write(c); err != nil {
			return err
		}
		glog.V(LDEBUG).Infoln("[socks5]", req)

		reply, err := gosocks5.ReadReply(c)
		if err != nil {
			return err
		}
		glog.V(LDEBUG).Infoln("[socks5]", reply)
		if reply.Rep != gosocks5.Succeeded {
			return errors.New("Service unavailable")
		}
	case "http":
		fallthrough
	default:
		req := &http.Request{
			Method:     http.MethodConnect,
			URL:        &url.URL{Host: addr},
			Host:       addr,
			ProtoMajor: 1,
			ProtoMinor: 1,
			Header:     make(http.Header),
		}
		req.Header.Set("Proxy-Connection", "keep-alive")
		if c.Node.User != nil {
			req.Header.Set("Proxy-Authorization",
				"Basic "+base64.StdEncoding.EncodeToString([]byte(c.Node.User.String())))
		}
		if err := req.Write(c); err != nil {
			return err
		}
		if glog.V(LDEBUG) {
			dump, _ := httputil.DumpRequest(req, false)
			glog.Infoln(string(dump))
		}

		resp, err := http.ReadResponse(bufio.NewReader(c), req)
		if err != nil {
			return err
		}
		if glog.V(LDEBUG) {
			dump, _ := httputil.DumpResponse(resp, false)
			glog.Infoln(string(dump))
		}
		if resp.StatusCode != http.StatusOK {
			return errors.New(resp.Status)
		}
	}

	return nil
}
Ejemplo n.º 11
0
func handleHttp(req *http.Request, conn net.Conn) {
	var host string
	var port uint16

	if listenUrl != nil && listenUrl.User != nil {
		username := listenUrl.User.Username()
		password, _ := listenUrl.User.Password()

		if err := clientHttpAuth(req, conn, username, password); err != nil {
			log.Println(err)
			return
		}
	}

	s := strings.Split(req.Host, ":")
	host = s[0]
	port = 80
	if len(s) == 2 {
		n, _ := strconv.ParseUint(s[1], 10, 16)
		port = uint16(n)
	}

	addr := &gosocks5.Addr{
		Type: gosocks5.AddrDomain,
		Host: host,
		Port: port,
	}
	r := gosocks5.NewRequest(gosocks5.CmdConnect, addr)

	sconn, err := makeTunnel()
	if err != nil {
		conn.Write([]byte("HTTP/1.1 503 Service unavailable\r\n" +
			"Proxy-Agent: gost/" + Version + "\r\n\r\n"))
		log.Println(err)
		return
	}
	defer sconn.Close()

	if err := r.Write(sconn); err != nil {
		return
	}
	rep, err := gosocks5.ReadReply(sconn)
	if err != nil || rep.Rep != gosocks5.Succeeded {
		conn.Write([]byte("HTTP/1.1 503 Service unavailable\r\n" +
			"Proxy-Agent: gost/" + Version + "\r\n\r\n"))
		return
	}

	if req.Method == "CONNECT" {
		if _, err = conn.Write(
			[]byte("HTTP/1.1 200 Connection established\r\n" +
				"Proxy-Agent: gost/" + Version + "\r\n\r\n")); err != nil {
			return
		}
	} else {
		if err := req.Write(sconn); err != nil {
			return
		}
	}

	if err := Transport(conn, sconn); err != nil {
		//log.Println(err)
	}
}
Ejemplo n.º 12
0
func (s *RUdpForwardServer) connectRUdpForward(conn net.Conn, laddr, raddr *net.UDPAddr) error {
	glog.V(LINFO).Infof("[rudp] %s - %s", laddr, raddr)

	req := gosocks5.NewRequest(CmdUdpTun, ToSocksAddr(laddr))
	conn.SetWriteDeadline(time.Now().Add(WriteTimeout))
	if err := req.Write(conn); err != nil {
		glog.V(LWARNING).Infof("[rudp] %s -> %s : %s", laddr, raddr, err)
		return err
	}
	conn.SetWriteDeadline(time.Time{})

	conn.SetReadDeadline(time.Now().Add(ReadTimeout))
	rep, err := gosocks5.ReadReply(conn)
	if err != nil {
		glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", laddr, raddr, err)
		return err
	}
	conn.SetReadDeadline(time.Time{})

	if rep.Rep != gosocks5.Succeeded {
		glog.V(LWARNING).Infof("[rudp] %s <- %s : bind on %s failure", laddr, raddr, laddr)
		return errors.New(fmt.Sprintf("bind on %s failure", laddr))
	}

	glog.V(LINFO).Infof("[rudp] %s - %s BIND ON %s OK", laddr, raddr, rep.Addr)

	for {
		dgram, err := gosocks5.ReadUDPDatagram(conn)
		if err != nil {
			glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", laddr, raddr, err)
			return err
		}

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

			relay, err := net.DialUDP("udp", nil, raddr)
			if err != nil {
				glog.V(LWARNING).Infof("[rudp] %s -> %s : %s", laddr, raddr, err)
				return
			}
			defer relay.Close()

			if _, err := relay.Write(dgram.Data); err != nil {
				glog.V(LWARNING).Infof("[rudp] %s -> %s : %s", laddr, raddr, err)
				return
			}
			glog.V(LDEBUG).Infof("[rudp] %s >>> %s length: %d", laddr, raddr, len(dgram.Data))

			relay.SetReadDeadline(time.Now().Add(ReadTimeout))
			n, err := relay.Read(b)
			if err != nil {
				glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", laddr, raddr, err)
				return
			}
			relay.SetReadDeadline(time.Time{})

			glog.V(LDEBUG).Infof("[rudp] %s <<< %s length: %d", laddr, raddr, n)

			conn.SetWriteDeadline(time.Now().Add(WriteTimeout))
			if err := gosocks5.NewUDPDatagram(gosocks5.NewUDPHeader(uint16(n), 0, dgram.Header.Addr), b[:n]).Write(conn); err != nil {
				glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", laddr, raddr, err)
				return
			}
			conn.SetWriteDeadline(time.Time{})
		}()
	}
}