// Keyboard input handling -each keypress can be interpreted as
// a control command.
void KeyboardControl()
{
while (true)
{
switch (Console.ReadKey(true).Key)
{
case ConsoleKey.T:
transportFunction.PrintRouteTable();
break;
case ConsoleKey.A:
LRM.PrintAssignments();
break;
case ConsoleKey.P:
if (Log.IsPaused)
{
Log.Unpause();
}
else
{
Log.Pause();
}
break;
#if DEBUG
case ConsoleKey.Enter:
MPLSPacket testPacket = new MPLSPacket(new int[] { 2137 }, "This is a test MPLSMessage.");
transportFunction.EnqueuePacketOnFirstQueue(testPacket);
break;
case ConsoleKey.U:
NHLFEntry entry = new NHLFEntry(10, 1, 17, true, 2, new int[] { 35 });
AddUpdateRequest testUpdateReq = new AddUpdateRequest("Helo it me", mgmtLocalPort, 2137, entry);
SendManagementMsg(mgmtLocalPort, testUpdateReq);
break;
case ConsoleKey.R:
RemoveRequest testRemoveReq = new RemoveRequest("Helo it me", mgmtLocalPort, 2137, 10);
SendManagementMsg(mgmtLocalPort, testRemoveReq);
break;
case ConsoleKey.L:
AllocateRequest testAllocReq = new AllocateRequest(id, mgmtLocalPort, allocCounter++, 1, 30, 1);
SendManagementMsg(mgmtLocalPort, testAllocReq);
break;
case ConsoleKey.D:
DeallocateRequest testDeallocReq = new DeallocateRequest(id, mgmtLocalPort, allocCounter--, 1);
SendManagementMsg(mgmtLocalPort, testDeallocReq);
break;
#endif
default:
break;
}
}
}
public void SendPeerMessage(byte snppId, GenericMessage genmsg)
{
//Log.WriteLine("[TX] PeerMessage: {0}, SNPP {1}", genmsg.messageType, snppId);
MPLSPacket packet = new MPLSPacket(new int[] { 0 }, "");
packet.managementObject = genmsg;
AggregatePacket aggregatePacket = new AggregatePacket(new MPLSPacket[] { packet });
BinaryWrapper wrappedPacket = MPLSMethods.Serialize(aggregatePacket);
MAC.SendData(wrappedPacket, snppId);
//Log.WriteLine("[TX {0}] => {1}, iface {2}", snppId, genmsg.messageType, snppId);
}
public void EnqueuePacket(MPLSPacket packet)
{
packetQueue.Enqueue(packet);
}
public void EnqueuePacketOnFirstQueue(MPLSPacket packet)
{
routerInterfaces[0].EnqueuePacket(packet);
}
/*
* Takes a packet and places it in a corresponding queue for output.
*/
void Route(MPLSPacket packet, byte iface, int connectionID = 0)
{
NHLFEntry routeEntry;
int topLabel = packet.labels.Pop();
try
{
var queryResults = from entry in routingTable
where entry.interface_in == iface && entry.label_in == topLabel && (connectionID == 0 || entry.connectionID == connectionID)
select entry;
// The query should always return a single entry (.Single() throws error if not single ;P)
routeEntry = queryResults.Single();
}
catch (InvalidOperationException)
{
// If no routing information is found, abandon route method
Log.WriteLine("[FWD] ({0}, {1}) ==> DROP", iface, topLabel);
return;
}
if (routeEntry.is_swap_or_add) // If the label is to be swapped or added...
{
foreach (int label in routeEntry.labels_out)
{
packet.labels.Push(label);
}
/*
* This mysterious construct does the following things:
* 1. Query the interface list in search of the one
* that has an ID [i.InterfaceId] equal to the one
* carried in the routing entry [routeEntry.interface_out]
* 2. Ensure that only single interface is received as
* a result (there should not be multiple interfaces
* with the same ID) and select it [.Single()]
* 3. Execute a method [.EnqueuePacket()] on that interface
* to insert the packet in a correspoding output queue
*
* Sincerely,
* Waked
*/
try
{
var queryResults = from i in routerInterfaces
where i.Id == routeEntry.interface_out
select i;
TELinkEnd outputIface = queryResults.Single();
outputIface.EnqueuePacket(packet);
Log.WriteLine("[FWD] ({0}, {1}) ==> ({2}, {3}))", iface, topLabel, routeEntry.interface_out, string.Join(";", routeEntry.labels_out));
}
catch (InvalidOperationException)
{
// In case there is no such interface to output (the routing
// infromation is flawed), abandon routing.
Log.WriteLine("[FWD] ({0}, {1}) ==> DROP", iface, topLabel);
}
}
else // ...otherwise, reroute the packet without the top-most label
{
Log.WriteLine("[FWD] ({0}, {1}) ==> Reforward({0}, {2})", iface, topLabel, packet.labels.Peek());
// Reroute the packet with the connectionID of the previous entry
Route(packet, iface, routeEntry.connectionID);
}
}
