static public HostAddress LookupExternalHost(string lookupName)
{
Log.Write(LogType.Verbose, LogComponent.MiscServices, "Name lookup external for '{0}'", lookupName);
IPHostEntry hostEntry = Dns.GetHostEntry(lookupName);
try
{
hostEntry = Dns.GetHostEntry(lookupName);
Log.Write(LogType.Verbose, LogComponent.MiscServices, "Got {0} hostEntry '{1}' {2} {3} {4}", lookupName, hostEntry, hostEntry.AddressList, hostEntry.AddressList.Length, hostEntry.AddressList[0]);
IPAddress address = hostEntry.AddressList[0];
Log.Write(LogType.Verbose, LogComponent.MiscServices, "Got address '{0}'", address);
IFS.HostAddress ifsAddr = new IFS.HostAddress((byte)(hostCounter >> 8) /* network */, (byte)(hostCounter & 0xff) /* host */);
hostCounter += 1;
Log.Write(LogType.Verbose, LogComponent.MiscServices, "Recording {0} {1}", ifsAddr, address);
_externalHosts[ifsAddr] = address;
return(ifsAddr);
}
catch (Exception e)
{
Log.Write(LogType.Verbose, LogComponent.MiscServices, "Name lookup exception {0} {1}", lookupName, e);
return(null);
}
}
public void ReceivePUP(PUP pup)
{
//
// Filter out packets not destined for us.
// Even though we use pcap in non-promiscuous mode, if
// something else has set the interface to promiscuous mode, that
// setting may be overridden.
//
Log.Write(LogType.Verbose, LogComponent.PUP, "PUP received.");
IFS.HostAddress targetAddress = new IFS.HostAddress(DirectoryServices.Instance.LocalNetwork, pup.DestinationPort.Host);
if (pup.DestinationPort.Host != 0 && // Not broadcast.
pup.DestinationPort.Host != DirectoryServices.Instance.LocalHost && // Not our address.
!ExternalHost.AcceptAddress(targetAddress))
{
// Do nothing with this PUP.
Log.Write(LogType.Verbose, LogComponent.PUP, "PUP {0} is neither broadcast nor for us. Discarding.", targetAddress);
return;
}
//
// Forward PUP on to registered endpoints.
//
if (_dispatchMap.ContainsKey(pup.DestinationPort.Socket))
{
PUPProtocolEntry entry = _dispatchMap[pup.DestinationPort.Socket];
if (entry.ConnectionType == ConnectionType.Connectionless)
{
Log.Write(LogType.Verbose, LogComponent.PUP, "Dispatching PUP (source {0}, dest {1}) to {2} handler.", pup.SourcePort, pup.DestinationPort, entry.FriendlyName);
// Connectionless; just pass the PUP directly to the protocol
entry.ProtocolImplementation.RecvData(pup);
}
else
{
// RTP / BSP protocol. Pass this to the BSP handler to set up a channel.
Log.Write(LogType.Verbose, LogComponent.PUP, "Dispatching PUP (source {0}, dest {1}) to BSP protocol for {0}.", pup.SourcePort, pup.DestinationPort, entry.FriendlyName);
BSPManager.EstablishRendezvous(pup, entry.WorkerType);
}
}
else if (ExternalHost.AcceptAddress(new HostAddress(pup.DestinationPort)))
{
// RTP / BSP protocol. Pass this to the BSP handler to set up a channel.
Log.Write(LogType.Verbose, LogComponent.PUP, "Remote host: Dispatching PUP (source {0}, dest X) to BSP protocol for {0}.", pup.SourcePort, pup.DestinationPort);
BSPManager.EstablishRendezvous(pup, typeof(ExternalHostWorker));
}
else if (BSPManager.ChannelExistsForSocket(pup))
{
// An established BSP channel, send data to it.
Log.Write(LogType.Normal, LogComponent.PUP, "BSP PUP");
BSPManager.RecvData(pup);
}
else if (EFTPManager.ChannelExistsForSocket(pup))
{
Log.Write(LogType.Normal, LogComponent.PUP, "EFTP PUP");
EFTPManager.RecvData(pup);
}
else
{
// Not a protocol we handle; log it.
Log.Write(LogType.Normal, LogComponent.PUP, "Unhandled PUP protocol, source {0}, destination {1}, type {2}, dropped packet.", pup.SourcePort, pup.DestinationPort, pup.Type);
}
}
