Golang net.NewPacket函数代码示例

func (server *SocksServer) handleSocks4(reader io.Reader, writer io.Writer, auth protocol.Socks4AuthenticationRequest) error {
	result := protocol.Socks4RequestGranted
	if auth.Command == protocol.CmdBind {
		result = protocol.Socks4RequestRejected
	}
	socks4Response := protocol.NewSocks4AuthenticationResponse(result, auth.Port, auth.IP[:])

	responseBuffer := alloc.NewSmallBuffer().Clear()
	socks4Response.Write(responseBuffer)
	writer.Write(responseBuffer.Value)
	responseBuffer.Release()

	if result == protocol.Socks4RequestRejected {
		log.Warning("Unsupported socks 4 command %d", auth.Command)
		return UnsupportedSocksCommand
	}

	dest := v2net.NewTCPDestination(v2net.IPAddress(auth.IP[:], auth.Port))
	data, err := v2net.ReadFrom(reader, nil)
	if err != nil {
		return err
	}

	packet := v2net.NewPacket(dest, data, true)
	server.transport(reader, writer, packet)
	return nil
}

func (this *DokodemoDoor) handleUDPPackets() {
	for this.accepting {
		buffer := alloc.NewBuffer()
		this.udpMutex.RLock()
		if !this.accepting {
			this.udpMutex.RUnlock()
			return
		}
		nBytes, addr, err := this.udpConn.ReadFromUDP(buffer.Value)
		this.udpMutex.RUnlock()
		buffer.Slice(0, nBytes)
		if err != nil {
			buffer.Release()
			log.Error("Dokodemo failed to read from UDP: ", err)
			return
		}

		packet := v2net.NewPacket(v2net.UDPDestination(this.address, this.port), buffer, false)
		ray := this.space.PacketDispatcher().DispatchToOutbound(packet)
		close(ray.InboundInput())

		for payload := range ray.InboundOutput() {
			this.udpMutex.RLock()
			if !this.accepting {
				this.udpMutex.RUnlock()
				return
			}
			this.udpConn.WriteToUDP(payload.Value, addr)
			this.udpMutex.RUnlock()
		}
	}
}

func TestSinglePacket(t *testing.T) {
	v2testing.Current(t)
	port := v2nettesting.PickPort()

	tcpServer := &tcp.Server{
		Port: port,
		MsgProcessor: func(data []byte) []byte {
			buffer := make([]byte, 0, 2048)
			buffer = append(buffer, []byte("Processed: ")...)
			buffer = append(buffer, data...)
			return buffer
		},
	}
	_, err := tcpServer.Start()
	assert.Error(err).IsNil()

	freedom := &FreedomConnection{}
	traffic := ray.NewRay()
	data2Send := "Data to be sent to remote"
	payload := alloc.NewSmallBuffer().Clear().Append([]byte(data2Send))
	packet := v2net.NewPacket(v2net.TCPDestination(v2net.IPAddress([]byte{127, 0, 0, 1}), port), payload, false)

	err = freedom.Dispatch(packet, traffic)
	assert.Error(err).IsNil()
	close(traffic.InboundInput())

	respPayload := <-traffic.InboundOutput()
	defer respPayload.Release()
	assert.Bytes(respPayload.Value).Equals([]byte("Processed: Data to be sent to remote"))

	_, open := <-traffic.InboundOutput()
	assert.Bool(open).IsFalse()

	tcpServer.Close()
}

func (handler *VMessInboundHandler) AcceptPackets(conn *net.UDPConn) {
	for {
		buffer := make([]byte, bufferSize)
		nBytes, addr, err := conn.ReadFromUDP(buffer)
		if err != nil {
			log.Error("VMessIn failed to read UDP packets: %v", err)
			continue
		}

		reader := bytes.NewReader(buffer[:nBytes])
		requestReader := protocol.NewVMessRequestReader(handler.clients)

		request, err := requestReader.Read(reader)
		if err != nil {
			log.Warning("VMessIn: Invalid request from (%s): %v", addr.String(), err)
			continue
		}

		cryptReader, err := v2io.NewAesDecryptReader(request.RequestKey, request.RequestIV, reader)
		if err != nil {
			log.Error("VMessIn: Failed to create decrypt reader: %v", err)
			continue
		}

		data := make([]byte, bufferSize)
		nBytes, err = cryptReader.Read(data)
		if err != nil {
			log.Warning("VMessIn: Unable to decrypt data: %v", err)
			continue
		}

		packet := v2net.NewPacket(request.Destination(), data[:nBytes], false)
		go handler.handlePacket(conn, request, packet, addr)
	}
}

func (server *SocksServer) AcceptPackets(conn *net.UDPConn) error {
	for {
		buffer := alloc.NewBuffer()
		nBytes, addr, err := conn.ReadFromUDP(buffer.Value)
		if err != nil {
			log.Error("Socks failed to read UDP packets: %v", err)
			buffer.Release()
			continue
		}
		log.Info("Client UDP connection from %v", addr)
		request, err := protocol.ReadUDPRequest(buffer.Value[:nBytes])
		buffer.Release()
		if err != nil {
			log.Error("Socks failed to parse UDP request: %v", err)
			request.Data.Release()
			continue
		}
		if request.Fragment != 0 {
			log.Warning("Dropping fragmented UDP packets.")
			// TODO handle fragments
			request.Data.Release()
			continue
		}

		udpPacket := v2net.NewPacket(request.Destination(), request.Data, false)
		log.Info("Send packet to %s with %d bytes", udpPacket.Destination().String(), request.Data.Len())
		go server.handlePacket(conn, udpPacket, addr, request.Address)
	}
}

func (this *UDPServer) handleConnection(destString string, inboundRay ray.InboundRay, source v2net.Destination, callback UDPResponseCallback) {
	for buffer := range inboundRay.InboundOutput() {
		callback(v2net.NewPacket(source, buffer, false))
	}
	this.Lock()
	delete(this.conns, destString)
	this.Unlock()
}

func (this *VMessInboundHandler) HandleConnection(connection *net.TCPConn) error {
	defer connection.Close()

	connReader := v2net.NewTimeOutReader(16, connection)
	requestReader := protocol.NewVMessRequestReader(this.clients)

	request, err := requestReader.Read(connReader)
	if err != nil {
		log.Access(connection.RemoteAddr().String(), "", log.AccessRejected, err.Error())
		log.Warning("VMessIn: Invalid request from (%s): %v", connection.RemoteAddr().String(), err)
		return err
	}
	log.Access(connection.RemoteAddr().String(), request.Address.String(), log.AccessAccepted, "")
	log.Debug("VMessIn: Received request for %s", request.Address.String())

	ray := this.space.PacketDispatcher().DispatchToOutbound(v2net.NewPacket(request.Destination(), nil, true))
	input := ray.InboundInput()
	output := ray.InboundOutput()
	var readFinish, writeFinish sync.Mutex
	readFinish.Lock()
	writeFinish.Lock()

	userSettings := vmess.GetUserSettings(request.User.Level)
	connReader.SetTimeOut(userSettings.PayloadReadTimeout)
	go handleInput(request, connReader, input, &readFinish)

	responseKey := md5.Sum(request.RequestKey)
	responseIV := md5.Sum(request.RequestIV)

	aesStream, err := v2crypto.NewAesEncryptionStream(responseKey[:], responseIV[:])
	if err != nil {
		log.Error("VMessIn: Failed to create AES decryption stream: %v", err)
		close(input)
		return err
	}

	responseWriter := v2crypto.NewCryptionWriter(aesStream, connection)

	// Optimize for small response packet
	buffer := alloc.NewLargeBuffer().Clear()
	defer buffer.Release()
	buffer.AppendBytes(request.ResponseHeader[0] ^ request.ResponseHeader[1])
	buffer.AppendBytes(request.ResponseHeader[2] ^ request.ResponseHeader[3])
	buffer.AppendBytes(byte(0), byte(0))

	if data, open := <-output; open {
		buffer.Append(data.Value)
		data.Release()
		responseWriter.Write(buffer.Value)
		go handleOutput(request, responseWriter, output, &writeFinish)
		writeFinish.Lock()
	}

	connection.CloseWrite()
	readFinish.Lock()

	return nil
}

func TestUDPSend(t *testing.T) {
	v2testing.Current(t)

	data2Send := "Data to be sent to remote"

	udpServer := &udp.Server{
		Port: 0,
		MsgProcessor: func(data []byte) []byte {
			buffer := make([]byte, 0, 2048)
			buffer = append(buffer, []byte("Processed: ")...)
			buffer = append(buffer, data...)
			return buffer
		},
	}

	udpServerAddr, err := udpServer.Start()
	assert.Error(err).IsNil()

	connOutput := bytes.NewBuffer(make([]byte, 0, 1024))
	ich := &proxymocks.InboundConnectionHandler{
		ConnInput:  bytes.NewReader([]byte("Not Used")),
		ConnOutput: connOutput,
	}

	protocol, err := proxytesting.RegisterInboundConnectionHandlerCreator("mock_ich",
		func(space app.Space, config interface{}) (v2proxy.InboundHandler, error) {
			ich.Space = space
			return ich, nil
		})
	assert.Error(err).IsNil()

	pointPort := v2nettesting.PickPort()
	config := &point.Config{
		Port: pointPort,
		InboundConfig: &point.ConnectionConfig{
			Protocol: protocol,
			Settings: nil,
		},
		OutboundConfig: &point.ConnectionConfig{
			Protocol: "freedom",
			Settings: nil,
		},
	}

	point, err := point.NewPoint(config)
	assert.Error(err).IsNil()

	err = point.Start()
	assert.Error(err).IsNil()

	data2SendBuffer := alloc.NewBuffer().Clear()
	data2SendBuffer.Append([]byte(data2Send))
	ich.Communicate(v2net.NewPacket(udpServerAddr, data2SendBuffer, false))
	assert.Bytes(connOutput.Bytes()).Equals([]byte("Processed: Data to be sent to remote"))
}

func (handler *VMessInboundHandler) HandleConnection(connection *net.TCPConn) error {
	defer connection.Close()

	connReader := v2net.NewTimeOutReader(16, connection)
	requestReader := protocol.NewVMessRequestReader(handler.clients)

	request, err := requestReader.Read(connReader)
	if err != nil {
		log.Access(connection.RemoteAddr().String(), "", log.AccessRejected, err.Error())
		log.Warning("VMessIn: Invalid request from (%s): %v", connection.RemoteAddr().String(), err)
		return err
	}
	log.Access(connection.RemoteAddr().String(), request.Address.String(), log.AccessAccepted, "")
	log.Debug("VMessIn: Received request for %s", request.Address.String())

	ray := handler.dispatcher.DispatchToOutbound(v2net.NewPacket(request.Destination(), nil, true))
	input := ray.InboundInput()
	output := ray.InboundOutput()
	var readFinish, writeFinish sync.Mutex
	readFinish.Lock()
	writeFinish.Lock()

	connReader.SetTimeOut(120)
	go handleInput(request, connReader, input, &readFinish)

	responseKey := md5.Sum(request.RequestKey)
	responseIV := md5.Sum(request.RequestIV)

	responseWriter, err := v2io.NewAesEncryptWriter(responseKey[:], responseIV[:], connection)
	if err != nil {
		log.Error("VMessIn: Failed to create encrypt writer: %v", err)
		return err
	}

	// Optimize for small response packet
	buffer := alloc.NewLargeBuffer().Clear()
	buffer.Append(request.ResponseHeader)

	if data, open := <-output; open {
		buffer.Append(data.Value)
		data.Release()
		responseWriter.Write(buffer.Value)
		buffer.Release()
		go handleOutput(request, responseWriter, output, &writeFinish)
		writeFinish.Lock()
	}

	connection.CloseWrite()
	readFinish.Lock()

	return nil
}

func (this *HttpProxyServer) handlePlainHTTP(request *http.Request, dest v2net.Destination, reader *bufio.Reader, writer io.Writer) {
	if len(request.URL.Host) <= 0 {
		hdr := http.Header(make(map[string][]string))
		hdr.Set("Connection", "close")
		response := &http.Response{
			Status:        "400 Bad Request",
			StatusCode:    400,
			Proto:         "HTTP/1.1",
			ProtoMajor:    1,
			ProtoMinor:    1,
			Header:        hdr,
			Body:          nil,
			ContentLength: 0,
			Close:         false,
		}

		buffer := alloc.NewSmallBuffer().Clear()
		response.Write(buffer)
		writer.Write(buffer.Value)
		buffer.Release()
		return
	}

	request.Host = request.URL.Host
	stripHopByHopHeaders(request)

	requestBuffer := alloc.NewBuffer().Clear()
	request.Write(requestBuffer)
	log.Info("Request to remote:\n%s", string(requestBuffer.Value))

	packet := v2net.NewPacket(dest, requestBuffer, true)
	ray := this.space.PacketDispatcher().DispatchToOutbound(packet)
	defer close(ray.InboundInput())

	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		defer wg.Done()
		responseReader := bufio.NewReader(NewChanReader(ray.InboundOutput()))
		responseBuffer := alloc.NewBuffer()
		defer responseBuffer.Release()
		response, err := http.ReadResponse(responseReader, request)
		if err != nil {
			return
		}
		responseBuffer.Clear()
		response.Write(responseBuffer)
		writer.Write(responseBuffer.Value)
		response.Body.Close()
	}()
	wg.Wait()
}

func (this *DokodemoDoor) handleUDPPackets(payload *alloc.Buffer, dest v2net.Destination) {
	packet := v2net.NewPacket(v2net.UDPDestination(this.address, this.port), payload, false)
	this.udpServer.Dispatch(dest, packet, func(packet v2net.Packet) {
		defer packet.Chunk().Release()
		this.udpMutex.RLock()
		if !this.accepting {
			this.udpMutex.RUnlock()
			return
		}
		this.udpHub.WriteTo(packet.Chunk().Value, packet.Destination())
		this.udpMutex.RUnlock()
	})
}

func TestUDPSend(t *testing.T) {
	assert := unit.Assert(t)

	data2Send := "Data to be sent to remote"

	udpServer := &udp.Server{
		Port: 0,
		MsgProcessor: func(data []byte) []byte {
			buffer := make([]byte, 0, 2048)
			buffer = append(buffer, []byte("Processed: ")...)
			buffer = append(buffer, data...)
			return buffer
		},
	}

	udpServerAddr, err := udpServer.Start()
	assert.Error(err).IsNil()

	connOutput := bytes.NewBuffer(make([]byte, 0, 1024))
	ich := &proxymocks.InboundConnectionHandler{
		ConnInput:  bytes.NewReader([]byte("Not Used")),
		ConnOutput: connOutput,
	}

	connhandler.RegisterInboundConnectionHandlerFactory("mock_ich", ich)

	pointPort := v2nettesting.PickPort()
	config := mocks.Config{
		PortValue: pointPort,
		InboundConfigValue: &mocks.ConnectionConfig{
			ProtocolValue: "mock_ich",
			SettingsValue: nil,
		},
		OutboundConfigValue: &mocks.ConnectionConfig{
			ProtocolValue: "freedom",
			SettingsValue: nil,
		},
	}

	point, err := point.NewPoint(&config)
	assert.Error(err).IsNil()

	err = point.Start()
	assert.Error(err).IsNil()

	data2SendBuffer := alloc.NewBuffer().Clear()
	data2SendBuffer.Append([]byte(data2Send))
	dest := v2net.NewUDPDestination(udpServerAddr)
	ich.Communicate(v2net.NewPacket(dest, data2SendBuffer, false))
	assert.Bytes(connOutput.Bytes()).Equals([]byte("Processed: Data to be sent to remote"))
}

func (handler *VMessInboundHandler) HandleConnection(connection net.Conn) error {
	defer connection.Close()

	connReader := v2net.NewTimeOutReader(4, connection)
	requestReader := protocol.NewVMessRequestReader(handler.clients)

	request, err := requestReader.Read(connReader)
	if err != nil {
		log.Warning("VMessIn: Invalid request from (%s): %v", connection.RemoteAddr().String(), err)
		return err
	}
	log.Debug("VMessIn: Received request for %s", request.Address.String())

	ray := handler.vPoint.DispatchToOutbound(v2net.NewPacket(request.Destination(), nil, true))
	input := ray.InboundInput()
	output := ray.InboundOutput()
	var readFinish, writeFinish sync.Mutex
	readFinish.Lock()
	writeFinish.Lock()

	go handleInput(request, connReader, input, &readFinish)

	responseKey := md5.Sum(request.RequestKey[:])
	responseIV := md5.Sum(request.RequestIV[:])

	response := protocol.NewVMessResponse(request)
	responseWriter, err := v2io.NewAesEncryptWriter(responseKey[:], responseIV[:], connection)
	if err != nil {
		return log.Error("VMessIn: Failed to create encrypt writer: %v", err)
	}

	// Optimize for small response packet
	buffer := make([]byte, 0, 2*1024)
	buffer = append(buffer, response[:]...)

	if data, open := <-output; open {
		buffer = append(buffer, data...)
		responseWriter.Write(buffer)
		go handleOutput(request, responseWriter, output, &writeFinish)
		writeFinish.Lock()
	}

	if tcpConn, ok := connection.(*net.TCPConn); ok {
		tcpConn.CloseWrite()
	}
	readFinish.Lock()

	return nil
}

func TestUnreachableDestination(t *testing.T) {
	v2testing.Current(t)

	freedom := &FreedomConnection{}
	traffic := ray.NewRay()
	data2Send := "Data to be sent to remote"
	payload := alloc.NewSmallBuffer().Clear().Append([]byte(data2Send))
	packet := v2net.NewPacket(v2net.TCPDestination(v2net.IPAddress([]byte{127, 0, 0, 1}), 128), payload, false)

	err := freedom.Dispatch(packet, traffic)
	assert.Error(err).IsNotNil()

	_, open := <-traffic.InboundOutput()
	assert.Bool(open).IsFalse()
}

func (this *UDPServer) Dispatch(source v2net.Destination, packet v2net.Packet, callback UDPResponseCallback) {
	destString := source.String() + "-" + packet.Destination().String()
	if this.locateExistingAndDispatch(destString, packet) {
		return
	}

	this.Lock()
	inboundRay := this.packetDispatcher.DispatchToOutbound(v2net.NewPacket(packet.Destination(), packet.Chunk(), true))
	this.conns[destString] = &connEntry{
		inboundRay: inboundRay,
		callback:   callback,
	}
	this.Unlock()
	go this.handleConnection(destString, inboundRay, source, callback)
}