private void SendIcmpReplyPacket(Packet request)
{
var icmp = request.Ethernet.IpV4.Icmp as IcmpEchoDatagram;
OSI.Layer3Packet packet = new OSI.Layer3Packet();
packet.Destination = request.Ethernet.IpV4.Source.ToString();
packet.SourceIP = _client.Configuration.IpAddress;
packet.Ttl = (byte)(request.Ethernet.IpV4.Ttl / 2);
var data = icmp.ToArray();
data = data.Subsegment(8, data.Length - 8).ToArray();
PcapDotNet.Packets.Icmp.IcmpEchoReplyLayer icmpLayer =
new PcapDotNet.Packets.Icmp.IcmpEchoReplyLayer
{
Checksum = null,
Identifier = icmp.Identifier,
SequenceNumber = (ushort)(icmp.SequenceNumber),
};
PcapDotNet.Packets.PayloadLayer extra = new PcapDotNet.Packets.PayloadLayer()
{
Data = new PcapDotNet.Packets.Datagram(data)
};
packet.NextLayers.Add(icmpLayer);
packet.NextLayers.Add(extra);
SendPacket(packet);
}
public override ILayer ExtractLayer()
{
IcmpEchoReplyLayer icmpEchoReplyLayer = new IcmpEchoReplyLayer();
icmpEchoReplyLayer.Checksum = new ushort?(this.Checksum);
icmpEchoReplyLayer.Identifier = this.Identifier;
icmpEchoReplyLayer.SequenceNumber = this.SequenceNumber;
return((ILayer)icmpEchoReplyLayer);
}
private static Packet BuildIcmpPacket(MacAddress SourceMac, MacAddress DestinationMac, IpV4Address SourceIp, IpV4Address CurrentDestination, string packetType)
{
EthernetLayer ethernetLayer =
new EthernetLayer
{
Source = SourceMac,
Destination = DestinationMac,
EtherType = EthernetType.None, // Will be filled automatically.
};
IpV4Layer ipV4Layer =
new IpV4Layer
{
//Source = new IpV4Address("1.2.3.4"),
//CurrentDestination = new IpV4Address("11.22.33.44"),
Source = SourceIp,
CurrentDestination = CurrentDestination,
Fragmentation = IpV4Fragmentation.None,
HeaderChecksum = null, // Will be filled automatically.
Identification = 123,
Options = IpV4Options.None,
Protocol = null, // Will be filled automatically.
Ttl = 100,
TypeOfService = 0,
};
IcmpEchoLayer icmpLayer = null;
IcmpEchoReplyLayer icmpRLayer = null;
PacketBuilder builder = null;
if (packetType.Equals("REQUEST"))
{
Console.WriteLine("Request");
icmpLayer =
new IcmpEchoLayer
{
Checksum = null, // Will be filled automatically.
Identifier = 456,
SequenceNumber = 800,
};
builder = new PacketBuilder(ethernetLayer, ipV4Layer, icmpLayer);
}
else
{
Console.WriteLine("Reply");
icmpRLayer =
new IcmpEchoReplyLayer
{
Checksum = null, // Will be filled automatically.
Identifier = 456,
SequenceNumber = 800,
};
builder = new PacketBuilder(ethernetLayer, ipV4Layer, icmpRLayer);
}
return builder.Build(DateTime.Now);
}