internal static void ARPHandler(byte[] packetData)
{
ARPPacket arp_packet = new ARPPacket(packetData);
//Sys.Console.WriteLine("Received ARP Packet");
//Sys.Console.WriteLine(arp_packet.ToString());
if (arp_packet.Operation == 0x01)
{
if ((arp_packet.HardwareType == 1) && (arp_packet.ProtocolType == 0x0800))
{
IPv4.ARPRequest_Ethernet arp_request = new IPv4.ARPRequest_Ethernet(packetData);
if (arp_request.SenderIP == null)
{
global::System.Console.WriteLine("SenderIP null in ARPHandler!");
}
arp_request = new IPv4.ARPRequest_Ethernet(packetData);
ARPCache.Update(arp_request.SenderIP, arp_request.SenderMAC);
if (NetworkStack.AddressMap.ContainsKey(arp_request.TargetIP.Hash) == true)
{
//Sys.Console.WriteLine("ARP Request Recvd from " + arp_request.SenderIP.ToString());
NetworkDevice nic = NetworkStack.AddressMap[arp_request.TargetIP.Hash];
IPv4.ARPReply_Ethernet reply =
new IPv4.ARPReply_Ethernet(nic.MACAddress, arp_request.TargetIP, arp_request.SenderMAC, arp_request.SenderIP);
nic.QueueBytes(reply.RawData);
}
}
}
else if (arp_packet.Operation == 0x02)
{
if ((arp_packet.HardwareType == 1) && (arp_packet.ProtocolType == 0x0800))
{
IPv4.ARPReply_Ethernet arp_reply = new IPv4.ARPReply_Ethernet(packetData);
//Sys.Console.WriteLine("Received ARP Reply");
//Sys.Console.WriteLine(arp_reply.ToString());
//Sys.Console.WriteLine("ARP Reply Recvd from " + arp_reply.SenderIP.ToString());
ARPCache.Update(arp_reply.SenderIP, arp_reply.SenderMAC);
IPv4.OutgoingBuffer.ARPCache_Update(arp_reply);
}
}
}