/// protocol list:
/// PING
/// ARP
/// etc...
/*
* //ARP
* public void requestARP(Packet arpReq){
* Debug.Log(id + ": Creating an ARP request!");
* if(ports[0].isConnected()){
* ports[0].send(arpReq);
* }
* }
* private void replyARP(Packet arpRep){
* Debug.Log("Replying to ARP!");
*
* if (ports[0].isConnected ()) {
* ports[0].send (arpRep);
* }
* }
*
*/
/// <summary>
/// handles the data link layer,
/// assigning mac addresses and
/// forwarding through port
/// </summary>
///
/// <param name="packet"></param>
///
/// <returns> true or false depending on success or failure of packet sending</returns>
public bool sendPacket(Packet packet)
{
//check if the port is connected
if (ports[0].isConnected())
{
Debug.Log(id + ": port is connected!");
packet.netAccess.setMAC(MAC, "src");
//check if the network mask is valid
if (GetComponent <Subnet>().validMask)
{
Debug.Log(id + ": Valid Network mask");
//check if dest network is local
if (GetComponent <Subnet>().CheckNetwork(packet.internet.getIP("dest")))
{
Debug.Log(id + ": destination is on local network!");
if (ports[0].isListed(packet.internet.getIP("dest")))
{
Debug.Log(id + ": MAC ADDRESS IS LISTED");
packet.netAccess.setMAC(ports[0].getDestMAC(packet), "dest"); //set destination mac address
return(ports[0].send(packet));
}
else
{
Debug.LogAssertion(id + ": ARP TABLE OUT OF DATE, REQUESTING>>>");
//send ARP Request!
ports[0].send(arp.Request(IP, packet.internet.getIP("dest")));
return(false);
}
}
else if (packet.GetComponent <DHCP>())
{
//TODO
//if the packet has a dhcp component, forward
return(ports[0].send(packet));
}
else if (subnet.defaultGateway != "")
{
Debug.LogAssertion(id + ": Not on same subnet!forwarding to default gateway");
packet.internet.setIP(subnet.defaultGateway, "dest");
return(sendPacket(packet));
}
else
{
Debug.LogAssertion("ERROR FOUND IN PC !!! no gateway assigned");
return(false);
}
}
else if (packet.GetComponent <DHCP>())
{
//if the packet contains a dhcp component, forward it on
return(ports[0].send(packet));
}
else
{
Debug.LogAssertion(id + ": Not a valid Network!");
return(false);
}
}
else
{
Debug.LogAssertion(id + ": NOT Connected");
return(false);
}
}
/**********************************
* 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());
* }
* }*/
}