Golang net.ReadFrom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 (server *SocksServer) handleUDP(reader *v2net.TimeOutReader, writer io.Writer) error {
	response := protocol.NewSocks5Response()
	response.Error = protocol.ErrorSuccess

	udpAddr := server.getUDPAddr()

	response.Port = udpAddr.Port()
	switch {
	case udpAddr.IsIPv4():
		response.AddrType = protocol.AddrTypeIPv4
		copy(response.IPv4[:], udpAddr.IP())
	case udpAddr.IsIPv6():
		response.AddrType = protocol.AddrTypeIPv6
		copy(response.IPv6[:], udpAddr.IP())
	case udpAddr.IsDomain():
		response.AddrType = protocol.AddrTypeDomain
		response.Domain = udpAddr.Domain()
	}
	err := protocol.WriteResponse(writer, response)
	if err != nil {
		log.Error("Socks failed to write response: %v", err)
		return err
	}

	reader.SetTimeOut(300)    /* 5 minutes */
	v2net.ReadFrom(reader, 1) // Just in case of anything left in the socket
	// The TCP connection closes after this method returns. We need to wait until
	// the client closes it.
	// TODO: get notified from UDP part
	<-time.After(5 * time.Minute)

	return nil
}

func handleResponse(conn net.Conn, request *protocol.VMessRequest, output chan<- *alloc.Buffer, finish *sync.Mutex, isUDP bool) {
	defer finish.Unlock()
	defer close(output)
	responseKey := md5.Sum(request.RequestKey[:])
	responseIV := md5.Sum(request.RequestIV[:])

	decryptResponseReader, err := v2io.NewAesDecryptReader(responseKey[:], responseIV[:], conn)
	if err != nil {
		log.Error("VMessOut: Failed to create decrypt reader: %v", err)
		return
	}

	buffer, err := v2net.ReadFrom(decryptResponseReader, nil)
	if err != nil {
		log.Error("VMessOut: Failed to read VMess response (%d bytes): %v", buffer.Len(), err)
		return
	}
	if buffer.Len() < 4 || !bytes.Equal(buffer.Value[:4], request.ResponseHeader[:]) {
		log.Warning("VMessOut: unexepcted response header. The connection is probably hijacked.")
		return
	}
	log.Info("VMessOut received %d bytes from %s", buffer.Len()-4, conn.RemoteAddr().String())

	buffer.SliceFrom(4)
	output <- buffer

	if !isUDP {
		v2net.ReaderToChan(output, decryptResponseReader)
	}

	return
}

func (server *SocksServer) handleUDP(reader *v2net.TimeOutReader, writer io.Writer) error {
	response := protocol.NewSocks5Response()
	response.Error = protocol.ErrorSuccess

	udpAddr := server.getUDPAddr()

	response.Port = udpAddr.Port()
	switch {
	case udpAddr.IsIPv4():
		response.SetIPv4(udpAddr.IP())
	case udpAddr.IsIPv6():
		response.SetIPv6(udpAddr.IP())
	case udpAddr.IsDomain():
		response.SetDomain(udpAddr.Domain())
	}

	responseBuffer := alloc.NewSmallBuffer().Clear()
	response.Write(responseBuffer)
	_, err := writer.Write(responseBuffer.Value)
	responseBuffer.Release()

	if err != nil {
		log.Error("Socks failed to write response: %v", err)
		return err
	}

	reader.SetTimeOut(300)      /* 5 minutes */
	v2net.ReadFrom(reader, nil) // Just in case of anything left in the socket
	// The TCP connection closes after this method returns. We need to wait until
	// the client closes it.
	// TODO: get notified from UDP part
	<-time.After(5 * time.Minute)

	return nil
}

func (this *FreedomConnection) Dispatch(firstPacket v2net.Packet, ray ray.OutboundRay) error {
	conn, err := net.Dial(firstPacket.Destination().Network(), firstPacket.Destination().Address().String())
	log.Info("Freedom: Opening connection to %s", firstPacket.Destination().String())
	if err != nil {
		close(ray.OutboundOutput())
		log.Error("Freedom: Failed to open connection: %s : %v", firstPacket.Destination().String(), err)
		return err
	}

	input := ray.OutboundInput()
	output := ray.OutboundOutput()
	var readMutex, writeMutex sync.Mutex
	readMutex.Lock()
	writeMutex.Lock()

	if chunk := firstPacket.Chunk(); chunk != nil {
		conn.Write(chunk.Value)
		chunk.Release()
	}

	if !firstPacket.MoreChunks() {
		writeMutex.Unlock()
	} else {
		go func() {
			v2net.ChanToWriter(conn, input)
			writeMutex.Unlock()
		}()
	}

	go func() {
		defer readMutex.Unlock()
		defer close(output)

		response, err := v2net.ReadFrom(conn, nil)
		log.Info("Freedom receives %d bytes from %s", response.Len(), conn.RemoteAddr().String())
		if response.Len() > 0 {
			output <- response
		} else {
			response.Release()
		}
		if err != nil {
			return
		}
		if firstPacket.Destination().IsUDP() {
			return
		}

		v2net.ReaderToChan(output, conn)
	}()

	writeMutex.Lock()
	if tcpConn, ok := conn.(*net.TCPConn); ok {
		tcpConn.CloseWrite()
	}
	readMutex.Lock()
	conn.Close()

	return nil
}

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

	data2Send := "Data to be sent to remote"

	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()

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

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

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

	socks5Client, err := proxy.SOCKS5("tcp", fmt.Sprintf("127.0.0.1:%d", pointPort), nil, proxy.Direct)
	assert.Error(err).IsNil()

	targetServer := fmt.Sprintf("127.0.0.1:%d", port)
	conn, err := socks5Client.Dial("tcp", targetServer)
	assert.Error(err).IsNil()

	conn.Write([]byte(data2Send))
	if tcpConn, ok := conn.(*net.TCPConn); ok {
		tcpConn.CloseWrite()
	}

	dataReturned, err := v2net.ReadFrom(conn, nil)
	assert.Error(err).IsNil()
	conn.Close()

	assert.Bytes(dataReturned.Value).Equals([]byte("Processed: Data to be sent to remote"))
}

func (server *Server) handleConnection(conn net.Conn) {
	for true {
		request, err := v2net.ReadFrom(conn, nil)
		if err != nil {
			break
		}
		response := server.MsgProcessor(request.Value)
		conn.Write(response)
	}
	conn.Close()
}

func handleResponse(conn net.Conn, request *protocol.VMessRequest, output chan<- *alloc.Buffer, finish *sync.Mutex, isUDP bool) {
	defer finish.Unlock()
	defer close(output)
	responseKey := md5.Sum(request.RequestKey[:])
	responseIV := md5.Sum(request.RequestIV[:])

	aesStream, err := v2crypto.NewAesDecryptionStream(responseKey[:], responseIV[:])
	if err != nil {
		log.Error("VMessOut: Failed to create AES encryption stream: ", err)
		return
	}
	decryptResponseReader := v2crypto.NewCryptionReader(aesStream, conn)

	buffer, err := v2net.ReadFrom(decryptResponseReader, nil)
	if err != nil {
		log.Error("VMessOut: Failed to read VMess response (", buffer.Len(), " bytes): ", err)
		buffer.Release()
		return
	}
	if buffer.Len() < 4 || !headerMatch(request, buffer.Value[:2]) {
		log.Warning("VMessOut: unexepcted response header. The connection is probably hijacked.")
		return
	}
	log.Info("VMessOut received ", buffer.Len()-4, " bytes from ", conn.RemoteAddr())

	responseBegin := 4
	if buffer.Value[2] != 0 {
		dataLen := int(buffer.Value[3])
		if buffer.Len() < dataLen+4 { // Rare case
			diffBuffer := make([]byte, dataLen+4-buffer.Len())
			v2net.ReadAllBytes(decryptResponseReader, diffBuffer)
			buffer.Append(diffBuffer)
		}
		command := buffer.Value[2]
		data := buffer.Value[4 : 4+dataLen]
		go handleCommand(command, data)
		responseBegin = 4 + dataLen
	}

	buffer.SliceFrom(responseBegin)
	output <- buffer

	if !isUDP {
		v2net.ReaderToChan(output, decryptResponseReader)
	}

	return
}

func dumpOutput(conn net.Conn, output chan<- []byte, finish *sync.Mutex, udp bool) {
	defer finish.Unlock()
	defer close(output)

	response, err := v2net.ReadFrom(conn)
	if len(response) > 0 {
		output <- response
	}
	if err != nil {
		return
	}
	if udp {
		return
	}

	v2net.ReaderToChan(output, conn)
}

func dumpOutput(conn net.Conn, output chan<- []byte, finish *sync.Mutex, udp bool) {
	defer finish.Unlock()
	defer close(output)

	response, err := v2net.ReadFrom(conn)
	log.Info("Freedom receives %d bytes from %s", len(response), conn.RemoteAddr().String())
	if len(response) > 0 {
		output <- response
	}
	if err != nil {
		return
	}
	if udp {
		return
	}

	v2net.ReaderToChan(output, conn)
}

func dumpOutput(conn net.Conn, output chan<- *alloc.Buffer, finish *sync.Mutex, udp bool) {
	defer finish.Unlock()
	defer close(output)

	response, err := v2net.ReadFrom(conn, nil)
	log.Info("Freedom receives %d bytes from %s", response.Len(), conn.RemoteAddr().String())
	if response.Len() > 0 {
		output <- response
	} else {
		response.Release()
	}
	if err != nil {
		return
	}
	if udp {
		return
	}

	v2net.ReaderToChan(output, conn)
}

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[:])
	writer.Write(socks4Response.ToBytes(nil))

	if result == protocol.Socks4RequestRejected {
		return errors.NewInvalidOperationError("Socks4 command " + strconv.Itoa(int(auth.Command)))
	}

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

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

func (server *SocksServer) handleSocks5(reader *v2net.TimeOutReader, writer io.Writer, auth protocol.Socks5AuthenticationRequest) error {
	expectedAuthMethod := protocol.AuthNotRequired
	if server.config.IsPassword() {
		expectedAuthMethod = protocol.AuthUserPass
	}

	if !auth.HasAuthMethod(expectedAuthMethod) {
		authResponse := protocol.NewAuthenticationResponse(protocol.AuthNoMatchingMethod)
		err := protocol.WriteAuthentication(writer, authResponse)
		if err != nil {
			log.Error("Socks failed to write authentication: %v", err)
			return err
		}
		log.Warning("Socks client doesn't support allowed any auth methods.")
		return UnsupportedAuthMethod
	}

	authResponse := protocol.NewAuthenticationResponse(expectedAuthMethod)
	err := protocol.WriteAuthentication(writer, authResponse)
	if err != nil {
		log.Error("Socks failed to write authentication: %v", err)
		return err
	}
	if server.config.IsPassword() {
		upRequest, err := protocol.ReadUserPassRequest(reader)
		if err != nil {
			log.Error("Socks failed to read username and password: %v", err)
			return err
		}
		status := byte(0)
		if !server.config.HasAccount(upRequest.Username(), upRequest.Password()) {
			status = byte(0xFF)
		}
		upResponse := protocol.NewSocks5UserPassResponse(status)
		err = protocol.WriteUserPassResponse(writer, upResponse)
		if err != nil {
			log.Error("Socks failed to write user pass response: %v", err)
			return err
		}
		if status != byte(0) {
			log.Warning("Invalid user account: %s", upRequest.AuthDetail())
			return proxyerrors.InvalidAuthentication
		}
	}

	request, err := protocol.ReadRequest(reader)
	if err != nil {
		log.Error("Socks failed to read request: %v", err)
		return err
	}

	if request.Command == protocol.CmdUdpAssociate && server.config.UDPEnabled {
		return server.handleUDP(reader, writer)
	}

	if request.Command == protocol.CmdBind || request.Command == protocol.CmdUdpAssociate {
		response := protocol.NewSocks5Response()
		response.Error = protocol.ErrorCommandNotSupported

		responseBuffer := alloc.NewSmallBuffer().Clear()
		response.Write(responseBuffer)
		_, err = writer.Write(responseBuffer.Value)
		responseBuffer.Release()
		if err != nil {
			log.Error("Socks failed to write response: %v", err)
			return err
		}
		log.Warning("Unsupported socks command %d", request.Command)
		return UnsupportedSocksCommand
	}

	response := protocol.NewSocks5Response()
	response.Error = protocol.ErrorSuccess

	// Some SOCKS software requires a value other than dest. Let's fake one:
	response.Port = uint16(1717)
	response.AddrType = protocol.AddrTypeIPv4
	response.IPv4[0] = 0
	response.IPv4[1] = 0
	response.IPv4[2] = 0
	response.IPv4[3] = 0

	responseBuffer := alloc.NewSmallBuffer().Clear()
	response.Write(responseBuffer)
	_, err = writer.Write(responseBuffer.Value)
	responseBuffer.Release()
	if err != nil {
		log.Error("Socks failed to write response: %v", err)
		return err
	}

	dest := request.Destination()
	data, err := v2net.ReadFrom(reader, nil)
	if err != nil {
		return err
	}

	packet := v2net.NewPacket(dest, data, true)
	server.transport(reader, writer, packet)
	return nil
//.........这里部分代码省略.........

func (server *SocksServer) handleSocks5(reader *v2net.TimeOutReader, writer io.Writer, auth protocol.Socks5AuthenticationRequest) error {
	expectedAuthMethod := protocol.AuthNotRequired
	if server.config.IsPassword() {
		expectedAuthMethod = protocol.AuthUserPass
	}

	if !auth.HasAuthMethod(expectedAuthMethod) {
		authResponse := protocol.NewAuthenticationResponse(protocol.AuthNoMatchingMethod)
		err := protocol.WriteAuthentication(writer, authResponse)
		if err != nil {
			log.Error("Socks failed to write authentication: %v", err)
			return err
		}
		log.Warning("Socks client doesn't support allowed any auth methods.")
		return errors.NewInvalidOperationError("Unsupported auth methods.")
	}

	authResponse := protocol.NewAuthenticationResponse(expectedAuthMethod)
	err := protocol.WriteAuthentication(writer, authResponse)
	if err != nil {
		log.Error("Socks failed to write authentication: %v", err)
		return err
	}
	if server.config.IsPassword() {
		upRequest, err := protocol.ReadUserPassRequest(reader)
		if err != nil {
			log.Error("Socks failed to read username and password: %v", err)
			return err
		}
		status := byte(0)
		if !upRequest.IsValid(server.config.Username, server.config.Password) {
			status = byte(0xFF)
		}
		upResponse := protocol.NewSocks5UserPassResponse(status)
		err = protocol.WriteUserPassResponse(writer, upResponse)
		if err != nil {
			log.Error("Socks failed to write user pass response: %v", err)
			return err
		}
		if status != byte(0) {
			err = errors.NewAuthenticationError(upRequest.AuthDetail())
			log.Warning(err.Error())
			return err
		}
	}

	request, err := protocol.ReadRequest(reader)
	if err != nil {
		log.Error("Socks failed to read request: %v", err)
		return err
	}

	response := protocol.NewSocks5Response()

	if request.Command == protocol.CmdUdpAssociate && server.config.UDPEnabled {
		return server.handleUDP(reader, writer)
	}

	if request.Command == protocol.CmdBind || request.Command == protocol.CmdUdpAssociate {
		response := protocol.NewSocks5Response()
		response.Error = protocol.ErrorCommandNotSupported
		err = protocol.WriteResponse(writer, response)
		if err != nil {
			log.Error("Socks failed to write response: %v", err)
			return err
		}
		log.Warning("Unsupported socks command %d", request.Command)
		return errors.NewInvalidOperationError("Socks command " + strconv.Itoa(int(request.Command)))
	}

	response.Error = protocol.ErrorSuccess

	response.Port = request.Port
	response.AddrType = request.AddrType
	switch response.AddrType {
	case protocol.AddrTypeIPv4:
		copy(response.IPv4[:], request.IPv4[:])
	case protocol.AddrTypeIPv6:
		copy(response.IPv6[:], request.IPv6[:])
	case protocol.AddrTypeDomain:
		response.Domain = request.Domain
	}
	err = protocol.WriteResponse(writer, response)
	if err != nil {
		log.Error("Socks failed to write response: %v", err)
		return err
	}

	dest := request.Destination()
	data, err := v2net.ReadFrom(reader)
	if err != nil {
		return err
	}

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

func (this *FreedomConnection) Dispatch(firstPacket v2net.Packet, ray ray.OutboundRay) error {
	log.Info("Freedom: Opening connection to ", firstPacket.Destination())

	var conn net.Conn
	err := retry.Timed(5, 100).On(func() error {
		rawConn, err := dialer.Dial(firstPacket.Destination())
		if err != nil {
			return err
		}
		conn = rawConn
		return nil
	})
	if err != nil {
		close(ray.OutboundOutput())
		log.Error("Freedom: Failed to open connection to ", firstPacket.Destination(), ": ", err)
		return err
	}
	defer conn.Close()

	input := ray.OutboundInput()
	output := ray.OutboundOutput()
	var readMutex, writeMutex sync.Mutex
	readMutex.Lock()
	writeMutex.Lock()

	if chunk := firstPacket.Chunk(); chunk != nil {
		conn.Write(chunk.Value)
		chunk.Release()
	}

	if !firstPacket.MoreChunks() {
		writeMutex.Unlock()
	} else {
		go func() {
			v2net.ChanToWriter(conn, input)
			writeMutex.Unlock()
		}()
	}

	go func() {
		defer readMutex.Unlock()
		defer close(output)

		response, err := v2net.ReadFrom(conn, nil)
		log.Info("Freedom receives ", response.Len(), " bytes from ", conn.RemoteAddr())
		if response.Len() > 0 {
			output <- response
		} else {
			response.Release()
		}
		if err != nil {
			return
		}
		if firstPacket.Destination().IsUDP() {
			return
		}

		v2net.ReaderToChan(output, conn)
	}()

	if this.space.HasDnsCache() {
		if firstPacket.Destination().Address().IsDomain() {
			domain := firstPacket.Destination().Address().Domain()
			addr := conn.RemoteAddr()
			switch typedAddr := addr.(type) {
			case *net.TCPAddr:
				this.space.DnsCache().Add(domain, typedAddr.IP)
			case *net.UDPAddr:
				this.space.DnsCache().Add(domain, typedAddr.IP)
			}
		}
	}

	writeMutex.Lock()
	if tcpConn, ok := conn.(*net.TCPConn); ok {
		tcpConn.CloseWrite()
	}
	readMutex.Lock()

	return nil
}