private static void device_PcapOnPacketArrival(object sender, PcapCaptureEventArgs e)
{
if (e.Packet is EthernetPacket)
{
EthernetPacket eth = ((EthernetPacket)e.Packet);
Console.WriteLine("Original Eth packet: " + eth.ToColoredString(false));
//Manipulate ethernet parameters
eth.SourceHwAddress = PhysicalAddress.Parse("00-11-22-33-44-55");
eth.DestinationHwAddress = PhysicalAddress.Parse("00-99-88-77-66-55");
if (e.Packet is IPPacket)
{
IPPacket ip = ((IPPacket)e.Packet);
Console.WriteLine("Original IP packet: " + ip.ToColoredString(false));
//manipulate IP parameters
ip.SourceAddress = System.Net.IPAddress.Parse("1.2.3.4");
ip.DestinationAddress = System.Net.IPAddress.Parse("44.33.22.11");
ip.TimeToLive = 11;
//Recalculate the IP checksum
ip.ComputeIPChecksum();
if (ip is TCPPacket)
{
TCPPacket tcp = ((TCPPacket)ip);
Console.WriteLine("Original TCP packet: " + tcp.ToColoredString(false));
//manipulate TCP parameters
tcp.SourcePort = 9999;
tcp.DestinationPort = 8888;
tcp.Syn = !tcp.Syn;
tcp.Fin = !tcp.Fin;
tcp.Ack = !tcp.Ack;
tcp.WindowSize = 500;
tcp.AcknowledgmentNumber = 800;
tcp.SequenceNumber = 800;
//Recalculate the TCP checksum
tcp.ComputeTCPChecksum();
}
if (ip is UDPPacket)
{
UDPPacket udp = ((UDPPacket)ip);
Console.WriteLine("Original UDP packet: " + udp.ToColoredString(false));
//manipulate UDP parameters
udp.SourcePort = 9999;
udp.DestinationPort = 8888;
//Recalculate the UDP checksum
udp.ComputeUDPChecksum();
}
}
Console.WriteLine("Manipulated Eth packet: " + eth.ToColoredString(false));
}
}
