gistfile1.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using Open.Nat;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Test.Initialize();
        }
    }

    public class Test
    {
        private static List<Tuple<Protocol, int>> PortMapRequirements = new List<Tuple<Protocol, int>>();
        private static List<Task> _tasks = new List<Task>();
        private static ManualResetEvent _discovery = new ManualResetEvent(false);

        public static void Initialize()
        {
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27015));
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27016));
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27017));
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27018));
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27019));
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27020));
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27021));
            PortMapRequirements.Add(new Tuple<Protocol, int>(Protocol.Udp, 27022));

            NatUtility.TraceSource.Switch.Level = SourceLevels.All;
            NatUtility.TraceSource.Listeners.Add(new ConsoleTraceListener());
            NatUtility.PortMapper = PortMapper.Upnp;
            NatUtility.DeviceFound += DeviceFound;
            NatUtility.DiscoveryTimedout += DiscoveryTimedout;
            NatUtility.DiscoveryTimeout = 10000; // Seconds // TODO make this smaller once the slow port map issue is fixed.
            NatUtility.ReleaseOnShutdown = false;
            NatUtility.Initialize();
            NatUtility.StartDiscovery();
            _discovery.WaitOne(); // this stops the execution waiting for a nat device 

            Task.WaitAll(_tasks.ToArray()); // this waits for all the mapping requests
        }


        private static void DeviceFound(object sender, DeviceEventArgs args)
        {
            var device = args.Device;
            foreach (var portMap in PortMapRequirements)
            {
                var protocol = portMap.Item1;
                var port = portMap.Item2;

                var t = CloseAndReopenPort(device, protocol, port);
                _tasks.Add(t);
            }
            _discovery.Set();
        }

        private static Task CloseAndReopenPort(NatDevice device, Protocol protocol, int port)
        {
            return device.DeletePortMapAsync(new Mapping(protocol, port, port))
                .ContinueWith(t => device.CreatePortMapAsync(new Mapping(protocol, port, port, 0, "YourGameName")));
        }

        static void DiscoveryTimedout(object sender, DiscoveryTimeoutEventArgs e)
        {
            _discovery.Set();
        }
    }
}