119 lines
4.9 KiB
C#
119 lines
4.9 KiB
C#
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//
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// Authors:
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// Ben Motmans <ben.motmans@gmail.com>
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// Nicholas Terry <nick.i.terry@gmail.com>
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//
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// Copyright (C) 2007 Ben Motmans
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// Copyright (C) 2014 Nicholas Terry
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net;
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using System.Net.NetworkInformation;
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using System.Net.Sockets;
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using System.Text;
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namespace Mono.Nat.Pmp
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{
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internal abstract class Pmp
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{
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public static List<UdpClient> sockets;
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protected static Dictionary<UdpClient, List<IPEndPoint>> gatewayLists;
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internal static void CreateSocketsAndAddGateways()
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{
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sockets = new List<UdpClient>();
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gatewayLists = new Dictionary<UdpClient, List<IPEndPoint>>();
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try
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{
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foreach (NetworkInterface n in NetworkInterface.GetAllNetworkInterfaces())
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{
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if (n.OperationalStatus != OperationalStatus.Up && n.OperationalStatus != OperationalStatus.Unknown)
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continue;
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IPInterfaceProperties properties = n.GetIPProperties();
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List<IPEndPoint> gatewayList = new List<IPEndPoint>();
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foreach (GatewayIPAddressInformation gateway in properties.GatewayAddresses)
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{
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if (gateway.Address.AddressFamily == AddressFamily.InterNetwork)
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{
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gatewayList.Add(new IPEndPoint(gateway.Address, PmpConstants.ServerPort));
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}
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}
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if (gatewayList.Count == 0)
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{
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/* Mono on OSX doesn't give any gateway addresses, so check DNS entries */
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foreach (var gw2 in properties.DnsAddresses)
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{
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if (gw2.AddressFamily == AddressFamily.InterNetwork)
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{
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gatewayList.Add(new IPEndPoint(gw2, PmpConstants.ServerPort));
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}
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}
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foreach (var unicast in properties.UnicastAddresses)
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{
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if (/*unicast.DuplicateAddressDetectionState == DuplicateAddressDetectionState.Preferred
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&& unicast.AddressPreferredLifetime != UInt32.MaxValue
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&& */unicast.Address.AddressFamily == AddressFamily.InterNetwork)
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{
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var bytes = unicast.Address.GetAddressBytes();
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bytes[3] = 1;
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gatewayList.Add(new IPEndPoint(new IPAddress(bytes), PmpConstants.ServerPort));
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}
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}
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}
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if (gatewayList.Count > 0)
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{
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foreach (UnicastIPAddressInformation address in properties.UnicastAddresses)
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{
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if (address.Address.AddressFamily == AddressFamily.InterNetwork)
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{
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UdpClient client;
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try
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{
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client = new UdpClient(new IPEndPoint(address.Address, 0));
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}
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catch (SocketException)
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{
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continue; // Move on to the next address.
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}
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gatewayLists.Add(client, gatewayList);
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sockets.Add(client);
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}
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}
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}
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}
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}
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catch (Exception)
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{
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// NAT-PMP does not use multicast, so there isn't really a good fallback.
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}
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}
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}
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}
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