public void handlePacket(Packet packet)
{
Debug.LogAssertion(id + ": Packet Received! -> " + packet.type);
//if it is a ping
if (packet.type.Equals("PING"))
{
//if the packet is an ECHO ICMP
if (packet.GetComponent <ICMP>().type.Equals("ECHO") && packet.GetComponent <ICMP>().ip.Equals(IP))
{
if (!sendPacket(ping.Reply(packet.internet.getIP("src"))))
{
//if packet doesn't send...
Debug.LogAssertion(id + ": PACKET FAILED TO SEND");
}
}
//if the packet is a REPLY ICMP
else if (packet.GetComponent <ICMP>().type.Equals("REPLY"))
{
//notify the Ping Application of successful reply
ping.success++;
}
}
//if it is an arp packet
if (packet.type.Equals("ARP"))
{
//if its a request ARP
if (packet.GetComponent <ARP>().type.Equals("REQUEST"))
{
//if the request is addressed to me
if (packet.internet.getIP("dest").Equals(IP))
{
//check if i have that computer in my arp, if not, update and reply, else just reply
if (!ports[0].isListed(packet.internet.getIP("src")))
{
ports[0].updateARPTable(packet.internet.getIP("src"), packet.netAccess.getMAC("src"));
}
ports[0].send(arp.Reply(IP, packet.internet.getIP("src"), packet.netAccess.getMAC("src")));
}
}
//else if its a REPLY ARP
else if (packet.GetComponent <ARP>().type.Equals("REPLY"))
{
//update table
Debug.Log(id + ": Processing ARP reply..");
ports[0].updateARPTable(packet.internet.getIP("src"), packet.netAccess.getMAC("src"));
}
else
{
//just drop the packet
Debug.Log(id + ": dropping ARP request , not my ip!");
}
}
if (packet.type.Contains("DHCP"))
{
//if this device is a DHCP server/client..
if (GetComponent <DHCPServer>())
{
GetComponent <DHCPServer>().handle(packet);
}
else if (GetComponent <DHCPClient>())
{
GetComponent <DHCPClient>().handle(packet);
}
}
}
/**********************************
* Receives and Handles incoming packets
*
*/
public void handlePacket(Packet packet, Port incomingPort)
{
Debug.Log("ROUTER: RECEIVED PACKET");
/*
* //add incoming device's MAC to port
* if(!incomingPort.isListed(packet.internet.getIP("src")))
* {
* incomingPort.updateARPTable(packet.internet.getIP("src"), packet.netAccess.getMAC("src"));
* }*/
//for dhcp
if (packet.type.Equals("DHCP"))
{
for (int i = 0; i < servers.Length; i++)
{
if (servers[i].port.Equals(incomingPort.GetComponent <Port>()))
{
servers[i].handle(packet);
}
}
}
//for ping
if (packet.type.Equals("PING"))
{
//get destination ip for ICMP currently
string destIp = packet.GetComponent <ICMP>().ip;
//get network of dest ip
string destNetwork = incomingPort.GetComponent <Subnet>().GetNetworkFromIP(destIp);
//fetches outgoing port based on route returned from routing table
Port outPort = GetRoutePort(destNetwork);
//if the port does not have the mac address, request it then send it after
if (!outPort.isListed(destIp))
{
requestARP(arp.Request(outPort.GetComponent <Subnet>().defaultGateway, destIp), outPort);
}
if (outPort != null)
{
//set the new destination ip
packet.internet.setIP(destIp, "dest");
outPort.send(packet);
}
else
{
Debug.LogAssertion(id + ": Dropping Ping, no routes found!");
}
}
//for arp
//if incoming packet is an ARP request addressed to this IP , return a reply
if (packet.type.Equals("ARP") && packet.internet.getIP("dest").Equals(incomingPort.GetComponent <Subnet>().defaultGateway))
{
//if this is a reply to this ip, add it to the incoming port's list
if (packet.GetComponent <ARP>().type.Equals("REPLY"))
{
incomingPort.updateARPTable(packet.internet.getIP("src"), packet.netAccess.getMAC("src"));
}
else if (!replyARP(arp.Reply(incomingPort.GetComponent <Subnet>().defaultGateway, packet.internet.getIP("src"), packet.netAccess.getMAC("src")), incomingPort))
{
if (!incomingPort.isConnected())
{
Debug.Log(id + ": Port is not connected, cant reply to ARP");
}
else
{
requestARP(arp.Request(incomingPort.GetComponent <Subnet>().defaultGateway, packet.internet.getIP("src")), incomingPort);
}
}
}
/*
* for(int i = 0; i < routingTable.Count; i++)
* {
*
* if(packet.type.Equals("ARP"))
* {
* Debug.Log("ROUTER: Dropping ARP request");
* break;
* }
* //if dest IP is on routing table, forward to the switch
* //TODO foreign networks , different ip ranges ,
* //this should only be for local area network.
*
* else if (packet.internet.getIP("dest").Equals(routingTable[i]))
* {
* push(packet, incomingPort.getType());
* }
* }*/
}