public void Intercept()
{
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
socket.Bind(new IPEndPoint(IPAddress.Parse(localIp), 0));
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);
socket.IOControl(IOControlCode.ReceiveAll, new byte[4] {
1, 0, 0, 0
}, new byte[4] {
1, 0, 0, 0
});
Action <IAsyncResult> OnReceive = null;
byte[] buffer = new byte[4096];
OnReceive = (result) =>
{
if (buffer[9] == 6) // TCP packets
{
IPHeader ipHeader = new IPHeader(buffer, socket.EndReceive(result));
TCPHeader tcpHeader = new TCPHeader(ipHeader.Data, ipHeader.MessageLength);
PacketHeader packet = new PacketHeader(ipHeader, tcpHeader);
if (tcpHeader.Flags.ToString().Contains("0x12"))
{
Console.WriteLine(packet.ToString());
}
}
buffer = new byte[4096];
socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(OnReceive), null);
};
socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(OnReceive), null);
}
public PacketHeader(IPHeader ipHeader, TCPHeader tcpHeader)
{
mIpHeader = ipHeader;
mTcpHeader = tcpHeader;
}