private void CreatePortMapAsync(object obj)
{
CreatePortMapAsyncState state = obj as CreatePortMapAsyncState;
UdpClient udpClient = new UdpClient();
CreatePortMapListenState listenState = new CreatePortMapListenState(state, udpClient);
int attempt = 0;
int delay = PmpConstants.RetryDelay;
ThreadPool.QueueUserWorkItem(new WaitCallback(CreatePortMapListen), listenState);
while (attempt < PmpConstants.RetryAttempts && !listenState.Success)
{
udpClient.Send(state.Buffer, state.Buffer.Length, new IPEndPoint(localAddress, PmpConstants.ServerPort));
listenState.UdpClientReady.Set();
attempt++;
delay *= 2;
Thread.Sleep(delay);
}
state.Success = listenState.Success;
udpClient.Close();
state.ResetEvent.Set();
}
private Mapping CreatePortMap(Mapping mapping, bool create)
{
List <byte> package = new List <byte> ();
package.Add(PmpConstants.Version);
package.Add(mapping.Protocol == Protocol.Tcp ? PmpConstants.OperationCodeTcp : PmpConstants.OperationCodeUdp);
package.Add((byte)0); //reserved
package.Add((byte)0); //reserved
package.AddRange(BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)mapping.PrivatePort)));
package.AddRange(BitConverter.GetBytes(create ? IPAddress.HostToNetworkOrder((short)mapping.PublicPort) : (short)0));
package.AddRange(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(mapping.Lifetime)));
CreatePortMapAsyncState state = new CreatePortMapAsyncState();
state.Buffer = package.ToArray();
state.Mapping = mapping;
ThreadPool.QueueUserWorkItem(new WaitCallback(CreatePortMapAsync), state);
WaitHandle.WaitAll(new WaitHandle[] { state.ResetEvent });
if (!state.Success)
{
string type = create ? "create" : "delete";
throw new MappingException(String.Format("Failed to {0} portmap (protocol={1}, private port={2}", type, mapping.Protocol, mapping.PrivatePort));
}
return(state.Mapping);
}
internal CreatePortMapListenState(CreatePortMapAsyncState state, UdpClient client)
{
Mapping = state.Mapping;
UdpClient = client; UdpClientReady = new ManualResetEvent(false);
}
