private void FilterAndProcessPacket(byte[] buffer)
{
try
{
var ipPacket = new IpPacket(buffer);
if (!ipPacket.IsValid || ipPacket.Protocol != ProtocolType.Tcp)
{
return;
}
var tcpPacket = new TcpPacket(ipPacket.Data);
if (!tcpPacket.IsValid)
{
return;
}
if (!tcpPacket.Flags.HasFlag(TcpFlags.ACK | TcpFlags.PSH))
{
return;
}
var sourceEndPoint = new IPEndPoint(ipPacket.SourceIpAddress, tcpPacket.SourcePort);
var destinationEndPoint = new IPEndPoint(ipPacket.DestinationIpAddress, tcpPacket.DestinationPort);
var connection = new Connection {
LocalEndPoint = sourceEndPoint, RemoteEndPoint = destinationEndPoint
};
var reverseConnection = new Connection {
LocalEndPoint = destinationEndPoint, RemoteEndPoint = sourceEndPoint
};
if (!(_connections.Contains(connection) || _connections.Contains(reverseConnection)))
{
return;
}
if (!_connections.Contains(reverseConnection))
{
return;
}
lock (_lockAnalyse)
{
_packetHandler.Analyze(_pid, tcpPacket.Payload, ref _state);
}
}
catch (Exception ex)
{
_logger.Write(ex, "N: Error while Filtering PacketsS", LogLevel.Error);
}
}