public netHeader.NetPacket CreatePacket()
{
netHeader.NetPacket nPK = new netHeader.NetPacket();
byte[] PLbytes = _pl.GetBytes;
byte[] rawbytes = new byte[PLbytes.Length + hlen];
nPK.size = PLbytes.Length + hlen;
Utils.memcpy(ref rawbytes, 0, DestinationMAC, 0, 6);
Utils.memcpy(ref rawbytes, 6, SourceMAC, 0, 6);
Utils.memcpy(ref rawbytes, 12, BitConverter.GetBytes(proto), 0, 2);
Utils.memcpy(ref rawbytes, 14, PLbytes, 0, PLbytes.Length);
Utils.memcpy(ref nPK.buffer, 0, rawbytes, 0, rawbytes.Length);
return(nPK);
}
public EthernetFrame(netHeader.NetPacket pkt)
{
_pkt = pkt;
Utils.memcpy(ref DestinationMAC, 0, pkt.buffer, 0, 6);
//Console.WriteLine("eth dst MAC :" + DestinationMAC[0] + ":" + DestinationMAC[1] + ":" + DestinationMAC[2] + ":" + DestinationMAC[3] + ":" + DestinationMAC[4] + ":" + DestinationMAC[5]);
Utils.memcpy(ref SourceMAC, 0, pkt.buffer, 6, 6);
//Console.WriteLine("src MAC :" + SourceMAC[0] + ":" + SourceMAC[1] + ":" + SourceMAC[2] + ":" + SourceMAC[3] + ":" + SourceMAC[4] + ":" + SourceMAC[5]);
hlen = 14; //(6+6+12)
//NOTE: we don't have to worry about the Ethernet Frame CRC as it is not included in the packet
proto = BitConverter.ToInt16(pkt.buffer, 12);
switch (proto) //Note, Diffrent Edian
{
case (int)EtherFrameType.NULL:
break;
case (int)EtherFrameType.IPv4:
_pl = new IPPacket(this);
break;
case (int)EtherFrameType.ARP:
_pl = new ARPPacket(this);
break;
case (int)0x0081:
//Console.Error.WriteLine("VLAN-tagged frame (IEEE 802.1Q)");
throw new NotImplementedException();
//break;
default:
Console.Error.WriteLine("Unkown Ethernet Protocol " + proto.ToString("X4"));
break;
}
}