private Router()
{
_localProtocolDispatcher = new PUPProtocolDispatcher();
_routingTable = new RoutingTable();
//
// Look up our own network in the table and get our port.
// If we don't have an entry in the table, disable routing.
//
RoutingTableEntry ourNetwork = _routingTable.GetAddressForNetworkNumber(DirectoryServices.Instance.LocalNetwork);
_gatewayUdpClientLock = new ReaderWriterLockSlim();
if (ourNetwork == null)
{
Log.Write(LogType.Warning,
LogComponent.Routing,
"networks.txt does not contain a definition for our network ({0}). Gateway routing disabled.",
DirectoryServices.Instance.LocalNetwork);
_gatewayUdpClient = null;
}
else
{
_gatewayUdpPort = ourNetwork.Port;
// Start the external network receiver.
BeginExternalReceive();
}
}
private void RoutePacketExternally(PUP p)
{
RoutingTableEntry destinationNetworkEntry = _routingTable.GetAddressForNetworkNumber(p.DestinationPort.Network);
if (destinationNetworkEntry != null)
{
//
// Send this out through the external network interface.
//
if (_gatewayUdpClient != null)
{
Log.Write(LogType.Verbose,
LogComponent.Routing,
"-> PUP routed to {0}:{1}, type {2} source {3} destination {4}.",
destinationNetworkEntry.HostAddress,
destinationNetworkEntry.Port,
p.Type,
p.SourcePort,
p.DestinationPort);
try
{
_gatewayUdpClientLock.EnterWriteLock();
_gatewayUdpClient.Send(p.RawData, p.RawData.Length, destinationNetworkEntry.HostAddress, destinationNetworkEntry.Port);
}
catch (Exception e)
{
Log.Write(LogType.Error,
LogComponent.Routing,
"Gateway UDP client send failed, error {0}. Continuing.",
e.Message);
}
finally
{
_gatewayUdpClientLock.ExitWriteLock();
}
}
}
else
{
//
// We don't know where to send this, drop it instead.
//
Log.Write(
LogType.Verbose,
LogComponent.Routing,
"Outgoing PUP is for unknown network {0}, dropping.", p.DestinationPort.Network);
}
}
/// <summary>
/// Returns the inter-network number for the network served by the given
/// host address. Returns 0 (undefined network) if no number is defined
/// for the given address.
/// </summary>
/// <param name="address"></param>
/// <returns></returns>
public byte GetNetworkNumberForAddress(RoutingTableEntry address)
{
throw new NotImplementedException();
}