public void ArpRequest(IPv4 sourceIP,
IPv4 targetIP,
Multiplexer !targetMux,
ArpRequestCallback callback,
object cookie,
TimeSpan timeout)
{
//
//XXXX Check pending request does not already exist!
//
EthernetAddress localMac = targetMux.Adapter.HardwareAddress;
AddPendingRequest(targetIP, callback, cookie, timeout);
// initiate an arp request...
DebugPrint("Initiating request " +
"({0},{1}) --> ({2},{3})\n",
sourceIP, localMac, targetIP, EthernetAddress.Zero);
byte[] data = new byte[ArpFormat.Size + EthernetFormat.Size];
int pos = EthernetFormat.Write(data, 0, localMac,
EthernetAddress.Broadcast,
EthernetFormat.PROTOCOL_ARP);
ArpFormat.Write(data, pos, localMac, sourceIP,
ArpFormat.Type.ARP_REQUEST, EthernetAddress.Zero,
targetIP);
NetPacket pkt = new NetPacket(data);
pkt.Mux = targetMux;
OnProtocolSend(pkt);
}
public PendingRequest(IPv4 address,
ArpRequestCallback callback,
object cookie,
DateTime expiry)
{
this.address = address;
this.callback = callback;
this.cookie = cookie;
this.expiry = expiry;
}
private void AddPendingRequest(IPv4 address,
ArpRequestCallback callback,
object cookie,
TimeSpan timeout)
{
DateTime expiry = DateTime.UtcNow + timeout;
pendingRequests.Add(
new PendingRequest(address, callback, cookie, expiry)
);
if (pendingRequests.Count == 1)
{
DateTime nextPoll = DateTime.UtcNow + PollPeriod;
Core.Instance().TheDispatcher.AddCallback(
new Dispatcher.Callback(OnRequestTimeout),
new TimeoutArgument(nextPoll),
(ulong)nextPoll.Ticks
);
}
}
