Exemplo n.º 1
0
// Process implements OutboundHandler.Process().
func (v *Client) Process(ctx context.Context, outboundRay ray.OutboundRay) error {
	destination := proxy.DestinationFromContext(ctx)
	network := destination.Network

	var server *protocol.ServerSpec
	var conn internet.Connection

	dialer := proxy.DialerFromContext(ctx)
	err := retry.ExponentialBackoff(5, 100).On(func() error {
		server = v.serverPicker.PickServer()
		dest := server.Destination()
		dest.Network = network
		rawConn, err := dialer.Dial(ctx, dest)
		if err != nil {
			return err
		}
		conn = rawConn

		return nil
	})
	if err != nil {
		log.Warning("Shadowsocks|Client: Failed to find an available destination:", err)
		return err
	}
	log.Info("Shadowsocks|Client: Tunneling request to ", destination, " via ", server.Destination())

	conn.SetReusable(false)

	request := &protocol.RequestHeader{
		Version: Version,
		Address: destination.Address,
		Port:    destination.Port,
	}
	if destination.Network == net.Network_TCP {
		request.Command = protocol.RequestCommandTCP
	} else {
		request.Command = protocol.RequestCommandUDP
	}

	user := server.PickUser()
	rawAccount, err := user.GetTypedAccount()
	if err != nil {
		log.Warning("Shadowsocks|Client: Failed to get a valid user account: ", err)
		return err
	}
	account := rawAccount.(*ShadowsocksAccount)
	request.User = user

	if account.OneTimeAuth == Account_Auto || account.OneTimeAuth == Account_Enabled {
		request.Option |= RequestOptionOneTimeAuth
	}

	if request.Command == protocol.RequestCommandTCP {
		bufferedWriter := bufio.NewWriter(conn)
		bodyWriter, err := WriteTCPRequest(request, bufferedWriter)
		if err != nil {
			log.Info("Shadowsocks|Client: Failed to write request: ", err)
			return err
		}

		bufferedWriter.SetBuffered(false)

		requestDone := signal.ExecuteAsync(func() error {
			if err := buf.PipeUntilEOF(outboundRay.OutboundInput(), bodyWriter); err != nil {
				return err
			}
			return nil
		})

		responseDone := signal.ExecuteAsync(func() error {
			defer outboundRay.OutboundOutput().Close()

			responseReader, err := ReadTCPResponse(user, conn)
			if err != nil {
				return err
			}

			if err := buf.PipeUntilEOF(responseReader, outboundRay.OutboundOutput()); err != nil {
				return err
			}

			return nil
		})

		if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
			log.Info("Shadowsocks|Client: Connection ends with ", err)
			outboundRay.OutboundInput().CloseError()
			outboundRay.OutboundOutput().CloseError()
			return err
		}

		return nil
	}

	if request.Command == protocol.RequestCommandUDP {

		writer := &UDPWriter{
			Writer:  conn,
			Request: request,
		}

		requestDone := signal.ExecuteAsync(func() error {
			if err := buf.PipeUntilEOF(outboundRay.OutboundInput(), writer); err != nil {
				log.Info("Shadowsocks|Client: Failed to transport all UDP request: ", err)
				return err
			}
			return nil
		})

		timedReader := net.NewTimeOutReader(16, conn)

		responseDone := signal.ExecuteAsync(func() error {
			defer outboundRay.OutboundOutput().Close()

			reader := &UDPReader{
				Reader: timedReader,
				User:   user,
			}

			if err := buf.PipeUntilEOF(reader, outboundRay.OutboundOutput()); err != nil {
				log.Info("Shadowsocks|Client: Failed to transport all UDP response: ", err)
				return err
			}
			return nil
		})

		if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
			log.Info("Shadowsocks|Client: Connection ends with ", err)
			outboundRay.OutboundInput().CloseError()
			outboundRay.OutboundOutput().CloseError()
			return err
		}

		return nil
	}

	return nil
}
Exemplo n.º 2
0
// Dispatch implements OutboundHandler.Dispatch().
func (v *VMessOutboundHandler) Process(ctx context.Context, outboundRay ray.OutboundRay) error {
	var rec *protocol.ServerSpec
	var conn internet.Connection

	dialer := proxy.DialerFromContext(ctx)
	err := retry.ExponentialBackoff(5, 100).On(func() error {
		rec = v.serverPicker.PickServer()
		rawConn, err := dialer.Dial(ctx, rec.Destination())
		if err != nil {
			return err
		}
		conn = rawConn

		return nil
	})
	if err != nil {
		log.Warning("VMess|Outbound: Failed to find an available destination:", err)
		return err
	}
	defer conn.Close()

	target := proxy.DestinationFromContext(ctx)
	log.Info("VMess|Outbound: Tunneling request to ", target, " via ", rec.Destination())

	command := protocol.RequestCommandTCP
	if target.Network == net.Network_UDP {
		command = protocol.RequestCommandUDP
	}
	request := &protocol.RequestHeader{
		Version: encoding.Version,
		User:    rec.PickUser(),
		Command: command,
		Address: target.Address,
		Port:    target.Port,
		Option:  protocol.RequestOptionChunkStream,
	}

	rawAccount, err := request.User.GetTypedAccount()
	if err != nil {
		log.Warning("VMess|Outbound: Failed to get user account: ", err)
		return err
	}
	account := rawAccount.(*vmess.InternalAccount)
	request.Security = account.Security

	conn.SetReusable(true)
	if conn.Reusable() { // Conn reuse may be disabled on transportation layer
		request.Option.Set(protocol.RequestOptionConnectionReuse)
	}

	input := outboundRay.OutboundInput()
	output := outboundRay.OutboundOutput()

	session := encoding.NewClientSession(protocol.DefaultIDHash)

	requestDone := signal.ExecuteAsync(func() error {
		writer := bufio.NewWriter(conn)
		session.EncodeRequestHeader(request, writer)

		bodyWriter := session.EncodeRequestBody(request, writer)
		firstPayload, err := input.ReadTimeout(time.Millisecond * 500)
		if err != nil && err != ray.ErrReadTimeout {
			return errors.Base(err).Message("VMess|Outbound: Failed to get first payload.")
		}
		if !firstPayload.IsEmpty() {
			if err := bodyWriter.Write(firstPayload); err != nil {
				return errors.Base(err).Message("VMess|Outbound: Failed to write first payload.")
			}
			firstPayload.Release()
		}

		writer.SetBuffered(false)

		if err := buf.PipeUntilEOF(input, bodyWriter); err != nil {
			return err
		}

		if request.Option.Has(protocol.RequestOptionChunkStream) {
			if err := bodyWriter.Write(buf.NewLocal(8)); err != nil {
				return err
			}
		}
		return nil
	})

	responseDone := signal.ExecuteAsync(func() error {
		defer output.Close()

		reader := bufio.NewReader(conn)
		header, err := session.DecodeResponseHeader(reader)
		if err != nil {
			return err
		}
		v.handleCommand(rec.Destination(), header.Command)

		conn.SetReusable(header.Option.Has(protocol.ResponseOptionConnectionReuse))

		reader.SetBuffered(false)
		bodyReader := session.DecodeResponseBody(request, reader)
		if err := buf.PipeUntilEOF(bodyReader, output); err != nil {
			return err
		}

		return nil
	})

	if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
		log.Info("VMess|Outbound: Connection ending with ", err)
		conn.SetReusable(false)
		input.CloseError()
		output.CloseError()
		return err
	}

	return nil
}
Exemplo n.º 3
0
func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay) error {
	destination := proxy.DestinationFromContext(ctx)
	if v.destOverride != nil {
		server := v.destOverride.Server
		destination = net.Destination{
			Network: destination.Network,
			Address: server.Address.AsAddress(),
			Port:    net.Port(server.Port),
		}
	}
	log.Info("Freedom: Opening connection to ", destination)

	input := outboundRay.OutboundInput()
	output := outboundRay.OutboundOutput()

	var conn internet.Connection
	if v.domainStrategy == Config_USE_IP && destination.Address.Family().IsDomain() {
		destination = v.ResolveIP(destination)
	}

	dialer := proxy.DialerFromContext(ctx)
	err := retry.ExponentialBackoff(5, 100).On(func() error {
		rawConn, err := dialer.Dial(ctx, destination)
		if err != nil {
			return err
		}
		conn = rawConn
		return nil
	})
	if err != nil {
		log.Warning("Freedom: Failed to open connection to ", destination, ": ", err)
		return err
	}
	defer conn.Close()

	conn.SetReusable(false)

	requestDone := signal.ExecuteAsync(func() error {
		v2writer := buf.NewWriter(conn)
		if err := buf.PipeUntilEOF(input, v2writer); err != nil {
			return err
		}
		return nil
	})

	var reader io.Reader = conn

	timeout := v.timeout
	if destination.Network == net.Network_UDP {
		timeout = 16
	}
	if timeout > 0 {
		reader = net.NewTimeOutReader(timeout /* seconds */, conn)
	}

	responseDone := signal.ExecuteAsync(func() error {
		defer output.Close()

		v2reader := buf.NewReader(reader)
		if err := buf.PipeUntilEOF(v2reader, output); err != nil {
			return err
		}
		return nil
	})

	if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
		log.Info("Freedom: Connection ending with ", err)
		input.CloseError()
		output.CloseError()
		return err
	}

	return nil
}
Exemplo n.º 4
0
func (c *Client) Process(ctx context.Context, ray ray.OutboundRay) error {
	destination := proxy.DestinationFromContext(ctx)

	var server *protocol.ServerSpec
	var conn internet.Connection

	dialer := proxy.DialerFromContext(ctx)
	err := retry.ExponentialBackoff(5, 100).On(func() error {
		server = c.serverPicker.PickServer()
		dest := server.Destination()
		rawConn, err := dialer.Dial(ctx, dest)
		if err != nil {
			return err
		}
		conn = rawConn

		return nil
	})

	if err != nil {
		log.Warning("Socks|Client: Failed to find an available destination.")
		return err
	}

	defer conn.Close()
	conn.SetReusable(false)

	request := &protocol.RequestHeader{
		Version: socks5Version,
		Command: protocol.RequestCommandTCP,
		Address: destination.Address,
		Port:    destination.Port,
	}
	if destination.Network == net.Network_UDP {
		request.Command = protocol.RequestCommandUDP
	}

	user := server.PickUser()
	if user != nil {
		request.User = user
	}

	udpRequest, err := ClientHandshake(request, conn, conn)
	if err != nil {
		log.Warning("Socks|Client: Failed to establish connection to server: ", err)
		return err
	}

	var requestFunc func() error
	var responseFunc func() error
	if request.Command == protocol.RequestCommandTCP {
		requestFunc = func() error {
			return buf.PipeUntilEOF(ray.OutboundInput(), buf.NewWriter(conn))
		}
		responseFunc = func() error {
			defer ray.OutboundOutput().Close()
			return buf.PipeUntilEOF(buf.NewReader(conn), ray.OutboundOutput())
		}
	} else if request.Command == protocol.RequestCommandUDP {
		udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
		if err != nil {
			log.Info("Socks|Client: Failed to create UDP connection: ", err)
			return err
		}
		defer udpConn.Close()
		requestFunc = func() error {
			return buf.PipeUntilEOF(ray.OutboundInput(), &UDPWriter{request: request, writer: udpConn})
		}
		responseFunc = func() error {
			defer ray.OutboundOutput().Close()
			reader := &UDPReader{reader: net.NewTimeOutReader(16, udpConn)}
			return buf.PipeUntilEOF(reader, ray.OutboundOutput())
		}
	}

	requestDone := signal.ExecuteAsync(requestFunc)
	responseDone := signal.ExecuteAsync(responseFunc)
	if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
		log.Info("Socks|Client: Connection ends with ", err)
		ray.OutboundInput().CloseError()
		ray.OutboundOutput().CloseError()
		return err
	}

	return nil
}