public void StopDecrypting()
{
IsRunning = false;
foreach (var stateObject in Sockets)
{
try
{
if (stateObject == null)
{
continue;
}
if (stateObject.Socket != null)
{
stateObject.Socket.Shutdown(SocketShutdown.Both);
stateObject.Socket.Close();
stateObject.Socket.Dispose();
stateObject.Socket = null;
}
lock (stateObject.SocketLock)
{
stateObject.Connections = new List <NetworkConnection>();
}
}
catch (Exception ex)
{
RaiseException(Logger, ex);
}
}
Sockets.Clear();
ServerConnections.Clear();
DroppedConnections.Clear();
}
private void ParseNetworkData(SocketObject asyncState, byte[] byteData, int nReceived)
{
if (byteData == null || byteData[9] != 6)
{
return;
}
var startIndex = (byte)((byteData[0] & 15) * 4);
var lengthCheck = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(byteData, 2));
if (nReceived < lengthCheck || startIndex > lengthCheck)
{
return;
}
var IP = new IPHeader(byteData, nReceived);
var TCP = new TCPHeader(byteData, nReceived);
var serverConnection = new ServerConnection
{
SourceAddress = (uint)BitConverter.ToInt32(byteData, 12),
DestinationAddress = (uint)BitConverter.ToInt32(byteData, 16),
SourcePort = (ushort)BitConverter.ToInt16(byteData, startIndex),
DestinationPort = (ushort)BitConverter.ToInt16(byteData, startIndex + 2),
TimeStamp = DateTime.Now
/*
* // these don't return the right ports for some reason
* DestinationAddress = BitConverter.ToUInt32(IP.DestinationAddress.GetAddressBytes(), 0),
* DestinationPort = Convert.ToUInt16(TCP.DestinationPort),
* SourcePort = Convert.ToUInt16(TCP.SourcePort),
* SourceAddress = BitConverter.ToUInt32(IP.SourceAddress.GetAddressBytes(), 0),
* TimeStamp = DateTime.Now
*/
};
lock (Lock)
{
var found = Enumerable.Contains(ServerConnections, serverConnection);
if (!found)
{
if (Enumerable.Contains(DroppedConnections, serverConnection))
{
return;
}
UpdateConnectionList();
if (!Enumerable.Contains(ServerConnections, serverConnection))
{
DroppedConnections.Add(serverConnection);
return;
}
}
}
if (startIndex + 12 > nReceived)
{
return;
}
var nextTCPSequence = (uint)IPAddress.NetworkToHostOrder(BitConverter.ToInt32(byteData, startIndex + 4));
var cut = (byte)(((byteData[startIndex + 12] & 240) >> 4) * 4);
var length = nReceived - startIndex - cut;
if (length < 0 || length > 0x10000)
{
return;
}
if (lengthCheck == startIndex + cut)
{
return;
}
lock (asyncState.SocketLock)
{
var connection = asyncState.Connections.FirstOrDefault(x => x.Equals(serverConnection));
if (connection == null)
{
connection = new NetworkConnection
{
SourceAddress = serverConnection.SourceAddress,
SourcePort = serverConnection.SourcePort,
DestinationAddress = serverConnection.DestinationAddress,
DestinationPort = serverConnection.DestinationPort
};
asyncState.Connections.Add(connection);
}
if (length == 0)
{
return;
}
var destinationBuffer = new byte[length];
Array.Copy(byteData, startIndex + cut, destinationBuffer, 0, length);
if (connection.StalePackets.ContainsKey(nextTCPSequence))
{
connection.StalePackets.Remove(nextTCPSequence);
}
var packet = new NetworkPacket
{
TCPSequence = nextTCPSequence,
Buffer = destinationBuffer,
Push = (byteData[startIndex + 13] & 8) != 0
};
connection.StalePackets.Add(nextTCPSequence, packet);
if (!connection.NextTCPSequence.HasValue)
{
connection.NextTCPSequence = nextTCPSequence;
}
if (connection.StalePackets.Count == 1)
{
connection.LastGoodNetworkPacketTime = DateTime.Now;
}
if (!connection.StalePackets.Any(x => x.Key <= connection.NextTCPSequence.Value))
{
if (DateTime.Now.Subtract(connection.LastGoodNetworkPacketTime)
.TotalSeconds <= 10.0)
{
return;
}
connection.NextTCPSequence = connection.StalePackets.Min(x => x.Key);
}
while (connection.StalePackets.Any(x => x.Key <= connection.NextTCPSequence.Value))
{
NetworkPacket stalePacket;
uint sequenceLength = 0;
if (connection.StalePackets.ContainsKey(connection.NextTCPSequence.Value))
{
stalePacket = connection.StalePackets[connection.NextTCPSequence.Value];
}
else
{
stalePacket = connection.StalePackets.Where(x => x.Key <= connection.NextTCPSequence.Value)
.OrderBy(x => x.Key)
.FirstOrDefault()
.Value;
sequenceLength = connection.NextTCPSequence.Value - stalePacket.TCPSequence;
}
connection.StalePackets.Remove(stalePacket.TCPSequence);
if (connection.NetworkBufferPosition == 0)
{
connection.LastNetworkBufferUpdate = DateTime.Now;
}
if (sequenceLength >= stalePacket.Buffer.Length)
{
continue;
}
connection.NextTCPSequence = stalePacket.TCPSequence + (uint)stalePacket.Buffer.Length;
Array.Copy(stalePacket.Buffer, sequenceLength, connection.NetworkBuffer, connection.NetworkBufferPosition, stalePacket.Buffer.Length - sequenceLength);
connection.NetworkBufferPosition += stalePacket.Buffer.Length - (int)sequenceLength;
if (stalePacket.Push)
{
ProcessNetworkBuffer(connection);
}
}
}
}
