private async Task <byte[]> GetPacketBytesAsync(Socket socket, MTProtoPacket mtprotoPacket)
{
var packetLengthBytes = new byte[1];
var resultPacketLength = await ReceiveAsync(packetLengthBytes, socket).ConfigureAwait(false);
if (resultPacketLength)
{
return(null);
}
packetLengthBytes = mtprotoPacket.DecryptObfuscated2(packetLengthBytes);
var packetLength = BitConverter.ToInt32(packetLengthBytes.Concat(new byte[] { 0x00, 0x00, 0x00 }).ToArray(), 0);
int lengthBytes;
if (packetLength < 0x7F)
{
lengthBytes = packetLength << 2;
}
else
{
var lenBytes = new byte[3];
var resultLengthBytes = ReceiveAsync(lenBytes, socket).Result;
if (resultLengthBytes)
{
return(null);
}
lenBytes = mtprotoPacket.DecryptObfuscated2(lenBytes);
lengthBytes = BitConverter.ToInt32(lenBytes.Concat(new byte[] { 0x00 }).ToArray(), 0) << 2;
}
var packetBytes = new byte[lengthBytes];
var resultpacket = ReceiveAsync(packetBytes, socket).Result;
if (resultpacket)
{
return(null);
}
packetBytes = mtprotoPacket.DecryptObfuscated2(packetBytes);
return(packetBytes);
}
private async void SenderSocketAsync(Socket socketClient, Socket socketServer, MTProtoPacket mtprotoPacketClient, MTProtoPacket mtprotoPacketServer)
{
try
{
while (true)
{
var packetBytesClient = await GetPacketBytesAsync(socketClient, mtprotoPacketClient).ConfigureAwait(false);
if (packetBytesClient == null)
{
return;
}
var packetEnc = mtprotoPacketServer.CreatePacketObfuscated2(packetBytesClient);
await socketServer.SendAsync(packetEnc, 0, packetEnc.Length).ConfigureAwait(false);
}
}
catch (Exception e)
{
if (e.InnerException != null)
{
Console.WriteLine(e.InnerException.Message);
return;
}
Console.WriteLine(e.Message);
}
}
private async void StartSocketAsync(Socket socket)
{
try
{
_listSocket.Add(socket);
var randomBuffer = new byte[64];
await socket.ReceiveAsync(randomBuffer, 0, randomBuffer.Length).ConfigureAwait(false);
var reversed = randomBuffer.SubArray(8, 48).Reverse().ToArray();
var key = randomBuffer.SubArray(8, 32);
var keyReversed = reversed.SubArray(0, 32);
var binSecret = ArrayUtils.HexToByteArray(_secret);
key = SHA256Helper.ComputeHashsum(key.Concat(binSecret).ToArray());
keyReversed = SHA256Helper.ComputeHashsum(keyReversed.Concat(binSecret).ToArray());
var mtprotoPacketServer = new MTProtoPacket();
mtprotoPacketServer.SetInitBufferObfuscated2(randomBuffer, reversed, key, keyReversed);
byte[] decryptBuf = mtprotoPacketServer.DecryptObfuscated2(randomBuffer).SubArray(56, 8);
for (int i = 56; i < 64; i++)
{
randomBuffer[i] = decryptBuf[i - 56];
}
byte[] res = randomBuffer.SubArray(56, 4);
for (int i = 0; i < 4; i++)
{
if (res[i] != 0xef)
{
Console.WriteLine("Error in buffer");
return;
}
}
var dcId = Math.Abs(BitConverter.ToInt16(randomBuffer.SubArray(60, 2), 0));
Console.WriteLine("Create new connection with dataCenterId:{0}", dcId);
var ip = _ipServersConfig[dcId - 1];
Socket socketClient = null;
MTProtoPacket mtprotoPacketClient = null;
object lockSend = new object();
while (socket.IsConnected())
{
ThrowIfDisposed();
var packetBytes = await GetPacketBytesAsync(socket, mtprotoPacketServer).ConfigureAwait(false);
if (packetBytes == null)
{
continue;
}
if (socketClient == null || !socketClient.Connected)
{
socketClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socketClient.Connect(ip, 443);
_listSocket.Add(socketClient);
mtprotoPacketClient = new MTProtoPacket();
await mtprotoPacketClient.SendInitBufferObfuscated2Async(socketClient).ConfigureAwait(false);
SenderSocketAsync(socketClient, socket, mtprotoPacketClient, mtprotoPacketServer);
}
var packet = mtprotoPacketClient.CreatePacketObfuscated2(packetBytes);
lock (lockSend)
{
socketClient.SendAsync(packet, 0, packet.Length).GetAwaiter().GetResult();
}
}
if (socketClient != null)
{
socketClient.Close();
_listSocket.Remove(socketClient);
}
Console.WriteLine("A connection was closed");
}
catch (Exception e)
{
if (e.InnerException != null)
{
Console.WriteLine(e.InnerException.Message);
return;
}
Console.WriteLine(e.Message);
}
try
{
socket.Close();
_listSocket.Remove(socket);
}
catch (Exception e)
{
if (e.InnerException != null)
{
Console.WriteLine(e.InnerException.Message);
return;
}
Console.WriteLine(e.Message);
}
}