408 lines
12 KiB
C#
Executable File
408 lines
12 KiB
C#
Executable File
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Net.Sockets;
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using System.Net;
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using Shadowsocks.Encryption;
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using Shadowsocks.Model;
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namespace Shadowsocks.Controller
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{
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class Local : Listener.Service
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{
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private Configuration _config;
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public Local(Configuration config)
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{
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this._config = config;
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}
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public bool Handle(byte[] firstPacket, int length, Socket socket)
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{
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if (length < 2 || firstPacket[0] != 5)
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{
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return false;
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}
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socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
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Handler handler = new Handler();
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handler.connection = socket;
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Server server = _config.GetCurrentServer();
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handler.encryptor = EncryptorFactory.GetEncryptor(server.method, server.password);
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handler.server = server;
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handler.Start(firstPacket, length);
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return true;
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}
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}
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class Handler
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{
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//public Encryptor encryptor;
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public IEncryptor encryptor;
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public Server server;
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// Client socket.
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public Socket remote;
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public Socket connection;
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private byte command;
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private byte[] _firstPacket;
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private int _firstPacketLength;
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// Size of receive buffer.
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public const int RecvSize = 16384;
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public const int BufferSize = RecvSize + 32;
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// remote receive buffer
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private byte[] remoteRecvBuffer = new byte[RecvSize];
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// remote send buffer
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private byte[] remoteSendBuffer = new byte[BufferSize];
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// connection receive buffer
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private byte[] connetionRecvBuffer = new byte[RecvSize];
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// connection send buffer
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private byte[] connetionSendBuffer = new byte[BufferSize];
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// Received data string.
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private bool connectionShutdown = false;
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private bool remoteShutdown = false;
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private bool closed = false;
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private object encryptionLock = new object();
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private object decryptionLock = new object();
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public void Start(byte[] firstPacket, int length)
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{
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this._firstPacket = firstPacket;
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this._firstPacketLength = length;
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this.HandshakeReceive();
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}
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private void CheckClose()
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{
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if (connectionShutdown && remoteShutdown)
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{
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this.Close();
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}
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}
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public void Close()
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{
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lock (this)
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{
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if (closed)
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{
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return;
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}
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closed = true;
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}
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if (connection != null)
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{
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try
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{
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connection.Shutdown(SocketShutdown.Both);
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connection.Close();
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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}
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}
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if (remote != null)
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{
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try
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{
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remote.Shutdown(SocketShutdown.Both);
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remote.Close();
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}
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catch (SocketException e)
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{
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Logging.LogUsefulException(e);
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}
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}
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lock (encryptionLock)
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{
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lock (decryptionLock)
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{
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((IDisposable)encryptor).Dispose();
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}
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}
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}
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private void HandshakeReceive()
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{
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if (closed)
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{
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return;
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}
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try
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{
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int bytesRead = _firstPacketLength;
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if (bytesRead > 1)
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{
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byte[] response = { 5, 0 };
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if (_firstPacket[0] != 5)
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{
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// reject socks 4
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response = new byte[] { 0, 91 };
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Console.WriteLine("socks 5 protocol error");
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}
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connection.BeginSend(response, 0, response.Length, 0, new AsyncCallback(HandshakeSendCallback), null);
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}
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else
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{
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this.Close();
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}
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void HandshakeSendCallback(IAsyncResult ar)
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{
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if (closed)
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{
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return;
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}
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try
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{
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connection.EndSend(ar);
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// +----+-----+-------+------+----------+----------+
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// |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
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// +----+-----+-------+------+----------+----------+
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// | 1 | 1 | X'00' | 1 | Variable | 2 |
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// +----+-----+-------+------+----------+----------+
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// Skip first 3 bytes
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// TODO validate
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connection.BeginReceive(connetionRecvBuffer, 0, 3, 0,
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new AsyncCallback(handshakeReceive2Callback), null);
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void handshakeReceive2Callback(IAsyncResult ar)
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{
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if (closed)
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{
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return;
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}
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try
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{
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int bytesRead = connection.EndReceive(ar);
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if (bytesRead >= 3)
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{
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command = connetionRecvBuffer[1];
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byte[] response = { 5, 0, 0, 1, 0, 0, 0, 0, 0, 0 };
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connection.BeginSend(response, 0, response.Length, 0, new AsyncCallback(StartConnect), null);
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}
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else
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{
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Console.WriteLine("failed to recv data in handshakeReceive2Callback");
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this.Close();
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}
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void StartConnect(IAsyncResult ar)
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{
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try
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{
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connection.EndSend(ar);
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// TODO async resolving
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IPAddress ipAddress;
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bool parsed = IPAddress.TryParse(server.server, out ipAddress);
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if (!parsed)
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{
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IPHostEntry ipHostInfo = Dns.GetHostEntry(server.server);
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ipAddress = ipHostInfo.AddressList[0];
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}
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IPEndPoint remoteEP = new IPEndPoint(ipAddress, server.server_port);
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remote = new Socket(ipAddress.AddressFamily,
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SocketType.Stream, ProtocolType.Tcp);
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remote.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
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// Connect to the remote endpoint.
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remote.BeginConnect(remoteEP,
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new AsyncCallback(ConnectCallback), null);
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void ConnectCallback(IAsyncResult ar)
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{
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if (closed)
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{
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return;
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}
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try
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{
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// Complete the connection.
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remote.EndConnect(ar);
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//Console.WriteLine("Socket connected to {0}",
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// remote.RemoteEndPoint.ToString());
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StartPipe();
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void StartPipe()
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{
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if (closed)
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{
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return;
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}
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try
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{
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remote.BeginReceive(remoteRecvBuffer, 0, RecvSize, 0,
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new AsyncCallback(PipeRemoteReceiveCallback), null);
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connection.BeginReceive(connetionRecvBuffer, 0, RecvSize, 0,
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new AsyncCallback(PipeConnectionReceiveCallback), null);
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void PipeRemoteReceiveCallback(IAsyncResult ar)
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{
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if (closed)
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{
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return;
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}
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try
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{
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int bytesRead = remote.EndReceive(ar);
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if (bytesRead > 0)
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{
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int bytesToSend;
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lock (decryptionLock)
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{
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if (closed)
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{
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return;
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}
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encryptor.Decrypt(remoteRecvBuffer, bytesRead, remoteSendBuffer, out bytesToSend);
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}
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connection.BeginSend(remoteSendBuffer, 0, bytesToSend, 0, new AsyncCallback(PipeConnectionSendCallback), null);
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}
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else
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{
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//Console.WriteLine("bytesRead: " + bytesRead.ToString());
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connection.Shutdown(SocketShutdown.Send);
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connectionShutdown = true;
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CheckClose();
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}
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void PipeConnectionReceiveCallback(IAsyncResult ar)
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{
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if (closed)
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{
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return;
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}
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try
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{
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int bytesRead = connection.EndReceive(ar);
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if (bytesRead > 0)
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{
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int bytesToSend;
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lock (encryptionLock)
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{
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if (closed)
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{
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return;
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}
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encryptor.Encrypt(connetionRecvBuffer, bytesRead, connetionSendBuffer, out bytesToSend);
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}
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remote.BeginSend(connetionSendBuffer, 0, bytesToSend, 0, new AsyncCallback(PipeRemoteSendCallback), null);
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}
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else
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{
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remote.Shutdown(SocketShutdown.Send);
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remoteShutdown = true;
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CheckClose();
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}
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void PipeRemoteSendCallback(IAsyncResult ar)
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{
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if (closed)
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{
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return;
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}
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try
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{
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remote.EndSend(ar);
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connection.BeginReceive(this.connetionRecvBuffer, 0, RecvSize, 0,
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new AsyncCallback(PipeConnectionReceiveCallback), null);
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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private void PipeConnectionSendCallback(IAsyncResult ar)
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{
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if (closed)
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{
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return;
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}
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try
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{
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connection.EndSend(ar);
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remote.BeginReceive(this.remoteRecvBuffer, 0, RecvSize, 0,
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new AsyncCallback(PipeRemoteReceiveCallback), null);
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}
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catch (Exception e)
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{
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Logging.LogUsefulException(e);
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this.Close();
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}
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}
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}
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}
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