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));
}
}
private static void device_PcapOnPacketArrival(object sender, Tamir.IPLib.Packets.Packet packet)
{
if (packet is EthernetPacket)
{
EthernetPacket eth = ((EthernetPacket)packet);
Console.WriteLine("Original packet: " + eth.ToColoredString(false));
//Manipulate ethernet parameters
eth.SourceHwAddress = "00:11:22:33:44:55";
eth.DestinationHwAddress = "00:99:88:77:66:55";
if (packet is IPPacket)
{
IPPacket ip = ((IPPacket)packet);
//manipulate IP parameters
ip.SourceAddress = "1.2.3.4";
ip.DestinationAddress = "44.33.22.11";
ip.TimeToLive = 11;
//Recalculate the IP checksum
ip.ComputeIPChecksum();
if (ip is TCPPacket)
{
TCPPacket tcp = ((TCPPacket)ip);
//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.AcknowledgementNumber = 800;
tcp.SequenceNumber = 800;
//Recalculate the TCP checksum
tcp.ComputeTCPChecksum();
}
if (ip is UDPPacket)
{
UDPPacket udp = ((UDPPacket)ip);
//manipulate UDP parameters
udp.SourcePort = 9999;
udp.DestinationPort = 8888;
//Recalculate the UDP checksum
udp.ComputeUDPChecksum();
}
}
Console.WriteLine("Manipulated packet: " + eth.ToColoredString(false));
}
}
public UDPPacket CreateUdpPacket(IPv4Packet ipv4Packet)
{
UDPPacket udpPacket = new UDPPacket(
EthernetFields_Fields.ETH_HEADER_LEN,
ipv4Packet.Bytes);
// UDP fields
udpPacket.SourcePort = Int32.Parse(textBoxSourcePort.Text);
udpPacket.DestinationPort = Int32.Parse(textBoxDestinationPort.Text);
udpPacket.Length = Int32.Parse(textBoxLength.Text);
// Calculate checksum
udpPacket.ComputeUDPChecksum(true);
return(udpPacket);
}
public static void Run(string[] args)
{
string S = "Hello";
int lLen = EthernetFields_Fields.ETH_HEADER_LEN;
//bytes = System.Convert.ToByte(S);
const int MIN_PKT_LEN = 42;
byte[] data = System.Text.Encoding.ASCII.GetBytes("HELLO");
byte[] bytes = new byte[MIN_PKT_LEN + data.Length];
Array.Copy(data, 0, bytes, MIN_PKT_LEN, data.Length);
PcapDeviceList devices = SharpPcap.GetAllDevices();
PcapDevice device = devices[2];
NetworkDevice netdev = (NetworkDevice)device;
UDPPacket packet = new UDPPacket(lLen, bytes);
//Ethernet Fields
packet.DestinationHwAddress = "001122334455";
packet.SourceHwAddress = netdev.MacAddress;
packet.EthernetProtocol = EthernetProtocols_Fields.IP;
//IP Fields
packet.DestinationAddress = "58.100.187.167";
packet.SourceAddress = netdev.IpAddress;
packet.IPProtocol = IPProtocols_Fields.UDP;
packet.TimeToLive = 20;
packet.Id = 100;
packet.Version = 4;
packet.IPTotalLength = bytes.Length - lLen;
packet.IPHeaderLength = IPFields_Fields.IP_HEADER_LEN;
//UDP Fields
packet.DestinationPort = 9898;
packet.SourcePort = 80;
packet.ComputeIPChecksum();
packet.ComputeUDPChecksum();
device.PcapOpen();
device.PcapSendPacket(packet);
device.PcapClose();
}
