internal static void IPv4Handler(byte[] packetData) { IPPacket ip_packet = new IPPacket(packetData); Kernel.debugger.Send("[Received] " + ip_packet.ToString()); if (ip_packet.SourceIP == null) { Kernel.debugger.Send("SourceIP null in IPv4Handler!"); } ARPCache.Update(ip_packet.SourceIP, ip_packet.SourceMAC); if ((NetworkStack.AddressMap.ContainsKey(ip_packet.DestinationIP.Hash) == true) || (ip_packet.DestinationIP.address[3] == 255)) { switch (ip_packet.Protocol) { case 1: ICMPPacket.ICMPHandler(packetData); break; /*case 6: * TCPPacket.TCPHandler(packetData); * break;*/ case 17: UDPPacket.UDPHandler(packetData); break; } } else if (NetworkStack.MACMap.ContainsKey(ip_packet.DestinationMAC.Hash)) { DHCPPacket.DHCPHandler(packetData); } }
internal static void ICMPHandler(byte[] packetData) { Apps.System.Debugger.debugger.Send("ICMP Handler called"); ICMPPacket icmp_packet = new ICMPPacket(packetData); switch (icmp_packet.ICMP_Type) { case 0: recvd_reply = new ICMPEchoReply(packetData); Apps.System.Debugger.debugger.Send("Received ICMP Echo reply from " + recvd_reply.SourceIP.ToString()); break; case 8: ICMPEchoRequest request = new ICMPEchoRequest(packetData); Apps.System.Debugger.debugger.Send("Received " + request.ToString()); ICMPEchoReply reply = new ICMPEchoReply(request); Apps.System.Debugger.debugger.Send("Sending ICMP Echo reply to " + reply.DestinationIP.ToString()); OutgoingBuffer.AddPacket(reply); NetworkStack.Update(); break; } }