internal ICMPEchoReply(ICMPEchoRequest request)
: base(request.DestinationIP, request.SourceIP, 0, 0,
request.ICMP_ID, request.ICMP_Sequence, (UInt16)(request.ICMP_DataLength + 8))
{
for (int b = 0; b < this.ICMP_DataLength; b++)
{
mRawData[this.dataOffset + 8 + b] = request.RawData[this.dataOffset + 8 + b];
}
mRawData[this.dataOffset + 2] = 0x00;
mRawData[this.dataOffset + 3] = 0x00;
icmpCRC = CalcICMPCRC((UInt16)(this.ICMP_DataLength + 8));
mRawData[this.dataOffset + 2] = (byte)((icmpCRC >> 8) & 0xFF);
mRawData[this.dataOffset + 3] = (byte)((icmpCRC >> 0) & 0xFF);
}
internal static void ICMPHandler(byte[] packetData)
{
//ICMP Handler called
ICMPPacket icmp_packet = new ICMPPacket(packetData);
switch (icmp_packet.ICMP_Type)
{
case 0:
recvd_reply = new ICMPEchoReply(packetData);
//Received ICMP Echo reply from " + recvd_reply.SourceIP.ToString()
break;
case 8:
ICMPEchoRequest request = new ICMPEchoRequest(packetData);
//Received " + request.ToString()
ICMPEchoReply reply = new ICMPEchoReply(request);
//Sending ICMP Echo reply to " + reply.DestinationIP.ToString()
OutgoingBuffer.AddPacket(reply);
NetworkStack.Update();
break;
}
}