Golang Connection.Write方法代码示例

func (this *FreedomConnection) Dispatch(destination v2net.Destination, payload *alloc.Buffer, ray ray.OutboundRay) error {
	log.Info("Freedom: Opening connection to ", destination)

	defer payload.Release()
	defer ray.OutboundInput().Release()
	defer ray.OutboundOutput().Close()

	var conn internet.Connection
	if this.domainStrategy == Config_USE_IP && destination.Address.Family().IsDomain() {
		destination = this.ResolveIP(destination)
	}
	err := retry.ExponentialBackoff(5, 100).On(func() error {
		rawConn, err := internet.Dial(this.meta.Address, destination, this.meta.GetDialerOptions())
		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()

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

	if !payload.IsEmpty() {
		conn.Write(payload.Value)
	}

	go func() {
		v2writer := v2io.NewAdaptiveWriter(conn)
		defer v2writer.Release()

		v2io.Pipe(input, v2writer)
		if tcpConn, ok := conn.(*tcp.RawConnection); ok {
			tcpConn.CloseWrite()
		}
	}()

	var reader io.Reader = conn

	timeout := this.timeout
	if destination.Network == v2net.Network_UDP {
		timeout = 16
	}
	if timeout > 0 {
		reader = v2net.NewTimeOutReader(timeout /* seconds */, conn)
	}

	v2reader := v2io.NewAdaptiveReader(reader)
	v2io.Pipe(v2reader, output)
	v2reader.Release()
	ray.OutboundOutput().Close()

	return nil
}

func (v *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection) error {
	source := proxy.SourceFromContext(ctx)

	reader := buf.NewReader(conn)
	for {
		payload, err := reader.Read()
		if err != nil {
			break
		}

		request, data, err := DecodeUDPPacket(v.user, payload)
		if err != nil {
			log.Info("Shadowsocks|Server: Skipping invalid UDP packet from: ", source, ": ", err)
			log.Access(source, "", log.AccessRejected, err)
			payload.Release()
			continue
		}

		if request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Disabled {
			log.Info("Shadowsocks|Server: Client payload enables OTA but server doesn't allow it.")
			payload.Release()
			continue
		}

		if !request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Enabled {
			log.Info("Shadowsocks|Server: Client payload disables OTA but server forces it.")
			payload.Release()
			continue
		}

		dest := request.Destination()
		log.Access(source, dest, log.AccessAccepted, "")
		log.Info("Shadowsocks|Server: Tunnelling request to ", dest)

		ctx = protocol.ContextWithUser(ctx, request.User)
		v.udpServer.Dispatch(ctx, dest, data, func(payload *buf.Buffer) {
			defer payload.Release()

			data, err := EncodeUDPPacket(request, payload)
			if err != nil {
				log.Warning("Shadowsocks|Server: Failed to encode UDP packet: ", err)
				return
			}
			defer data.Release()

			conn.Write(data.Bytes())
		})
	}

	return nil
}

func (v *Server) handleUDPPayload(ctx context.Context, conn internet.Connection) error {
	source := proxy.SourceFromContext(ctx)
	log.Info("Socks|Server: Client UDP connection from ", source)

	reader := buf.NewReader(conn)
	for {
		payload, err := reader.Read()
		if err != nil {
			return err
		}
		request, data, err := DecodeUDPPacket(payload.Bytes())

		if err != nil {
			log.Info("Socks|Server: Failed to parse UDP request: ", err)
			continue
		}

		if len(data) == 0 {
			continue
		}

		log.Info("Socks: Send packet to ", request.Destination(), " with ", len(data), " bytes")
		log.Access(source, request.Destination, log.AccessAccepted, "")

		dataBuf := buf.NewSmall()
		dataBuf.Append(data)
		v.udpServer.Dispatch(ctx, request.Destination(), dataBuf, func(payload *buf.Buffer) {
			defer payload.Release()

			log.Info("Socks|Server: Writing back UDP response with ", payload.Len(), " bytes")

			udpMessage := EncodeUDPPacket(request, payload.Bytes())
			defer udpMessage.Release()

			conn.Write(udpMessage.Bytes())
		})
	}
}

func (this *Server) handleConnection(conn internet.Connection) {
	defer conn.Close()

	buffer := alloc.NewSmallBuffer()
	defer buffer.Release()

	timedReader := v2net.NewTimeOutReader(16, conn)
	defer timedReader.Release()

	bufferedReader := v2io.NewBufferedReader(timedReader)
	defer bufferedReader.Release()

	ivLen := this.config.Cipher.IVSize()
	_, err := io.ReadFull(bufferedReader, buffer.Value[:ivLen])
	if err != nil {
		if err != io.EOF {
			log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
			log.Warning("Shadowsocks: Failed to read IV: ", err)
		}
		return
	}

	iv := buffer.Value[:ivLen]
	key := this.config.Key

	stream, err := this.config.Cipher.NewDecodingStream(key, iv)
	if err != nil {
		log.Error("Shadowsocks: Failed to create decoding stream: ", err)
		return
	}

	reader := crypto.NewCryptionReader(stream, bufferedReader)

	request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(key, iv)), false)
	if err != nil {
		log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
		log.Warning("Shadowsocks: Invalid request from ", conn.RemoteAddr(), ": ", err)
		return
	}
	defer request.Release()
	bufferedReader.SetCached(false)

	userSettings := protocol.GetUserSettings(this.config.Level)
	timedReader.SetTimeOut(userSettings.PayloadReadTimeout)

	dest := v2net.TCPDestination(request.Address, request.Port)
	log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
	log.Info("Shadowsocks: Tunnelling request to ", dest)

	ray := this.packetDispatcher.DispatchToOutbound(this.meta, &proxy.SessionInfo{
		Source:      v2net.DestinationFromAddr(conn.RemoteAddr()),
		Destination: dest,
	})
	defer ray.InboundOutput().Release()

	var writeFinish sync.Mutex
	writeFinish.Lock()
	go func() {
		if payload, err := ray.InboundOutput().Read(); err == nil {
			payload.SliceBack(ivLen)
			rand.Read(payload.Value[:ivLen])

			stream, err := this.config.Cipher.NewEncodingStream(key, payload.Value[:ivLen])
			if err != nil {
				log.Error("Shadowsocks: Failed to create encoding stream: ", err)
				return
			}
			stream.XORKeyStream(payload.Value[ivLen:], payload.Value[ivLen:])

			conn.Write(payload.Value)
			payload.Release()

			writer := crypto.NewCryptionWriter(stream, conn)
			v2writer := v2io.NewAdaptiveWriter(writer)

			v2io.Pipe(ray.InboundOutput(), v2writer)
			writer.Release()
			v2writer.Release()
		}
		writeFinish.Unlock()
	}()

	var payloadReader v2io.Reader
	if request.OTA {
		payloadAuth := NewAuthenticator(ChunkKeyGenerator(iv))
		payloadReader = NewChunkReader(reader, payloadAuth)
	} else {
		payloadReader = v2io.NewAdaptiveReader(reader)
	}

	v2io.Pipe(payloadReader, ray.InboundInput())
	ray.InboundInput().Close()
	payloadReader.Release()

	writeFinish.Lock()
}