/// <summary> /// Start listening for incoming udp data /// </summary> protected override void StartIncomingDataListen() { #if WINDOWS_PHONE throw new NotImplementedException("Not needed for UDP connections on Windows Phone 8"); #else if (NetworkComms.ConnectionListenModeUseSync) { if (incomingDataListenThread == null) { incomingDataListenThread = new Thread(IncomingUDPPacketWorker); incomingDataListenThread.Priority = NetworkComms.timeCriticalThreadPriority; incomingDataListenThread.Name = "IncomingDataListener"; incomingDataListenThread.Start(); } } else { udpClientThreadSafe.BeginReceive(new AsyncCallback(IncomingUDPPacketHandler), udpClientThreadSafe); } #endif }
/// <summary> /// Incoming data listen async method /// </summary> /// <param name="ar">Call back state data</param> private void IncomingUDPPacketHandler(IAsyncResult ar) { try { UdpClientThreadSafe client = (UdpClientThreadSafe)ar.AsyncState; IPEndPoint endPoint = new IPEndPoint(IPAddress.None, 0); byte[] receivedBytes = client.EndReceive(ar, ref endPoint); if (NetworkComms.LoggingEnabled) { NetworkComms.Logger.Trace("Received " + receivedBytes.Length.ToString() + " bytes via UDP from " + endPoint.Address + ":" + endPoint.Port.ToString() + "."); } if (isIsolatedUDPConnection) { //This connection was created for a specific remoteEndPoint so we can handle the data internally //Lock on the packetbuilder locker as we may recieve udp packets in parallel from this host lock (packetBuilder.Locker) { packetBuilder.AddPartialPacket(receivedBytes.Length, receivedBytes); if (packetBuilder.TotalBytesCached > 0) { IncomingPacketHandleHandOff(packetBuilder); } } } else { //Look for an existing connection, if one does not exist we will create it //This ensures that all further processing knows about the correct endPoint UDPConnection connection = GetConnection(new ConnectionInfo(true, ConnectionType.UDP, endPoint, udpClientThreadSafe.LocalEndPoint), ConnectionDefaultSendReceiveOptions, UDPOptions, false, this); //We pass the data off to the specific connection //Lock on the packetbuilder locker as we may recieve udp packets in parallel from this host lock (connection.packetBuilder.Locker) { connection.packetBuilder.AddPartialPacket(receivedBytes.Length, receivedBytes); if (connection.packetBuilder.TotalBytesCached > 0) { connection.IncomingPacketHandleHandOff(connection.packetBuilder); } if (connection.packetBuilder.TotalPartialPacketCount > 0) { connection.packetBuilder.ClearNTopBytes(connection.packetBuilder.TotalBytesCached); //We cant close the connection here because it may be one of the shared udp listeners. For now we will just log. NetworkComms.LogError(new Exception("Packet builder had remaining packets after a call to IncomingPacketHandleHandOff. Until sequenced packets are implemented this indicates a possible error."), "UDPConnectionError"); } } } client.BeginReceive(new AsyncCallback(IncomingUDPPacketHandler), client); } //On any error here we close the connection catch (NullReferenceException) { CloseConnection(true, 25); } catch (ArgumentNullException) { CloseConnection(true, 36); } catch (IOException) { CloseConnection(true, 26); } catch (ObjectDisposedException) { CloseConnection(true, 27); } catch (SocketException) { //Recieve may throw a SocketException ErrorCode=10054 after attempting to send a datagram to an unreachable target. //We will try to get around this by ignoring the ICMP packet causing these problems on client creation CloseConnection(true, 28); } catch (InvalidOperationException) { CloseConnection(true, 29); } catch (Exception ex) { NetworkComms.LogError(ex, "Error_UDPConnectionIncomingPacketHandler"); CloseConnection(true, 30); } }