Modified lidgren to support IPv6 (code from https://github.com/lidgren/lidgren-network-gen3/pull/33). TODO: test

Libraries/Lidgren.Network/Lidgren.Network.csproj

@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Lidgren.Network</RootNamespace>
     <AssemblyName>Lidgren.Network</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <PublishUrl>publish\</PublishUrl>
     <Install>true</Install>

Libraries/Lidgren.Network/NetPeer.Internal.cs

@@ -124,17 +124,18 @@ namespace Lidgren.Network
 			m_lastSocketBind = now;
 
 			if (m_socket == null)
-				m_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
+                m_socket = new Socket(AddressFamily.InterNetworkV6, SocketType.Dgram, ProtocolType.Udp);
 
-			if (reBind)
+            if (reBind)
 				m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, (int)1); 
 
 			m_socket.ReceiveBufferSize = m_configuration.ReceiveBufferSize;
 			m_socket.SendBufferSize = m_configuration.SendBufferSize;
 			m_socket.Blocking = false;
+            m_socket.DualMode = true;
 
-			var ep = (EndPoint)new NetEndPoint(m_configuration.LocalAddress, reBind ? m_listenPort : m_configuration.Port);
+            var ep = (EndPoint)new NetEndPoint(m_configuration.LocalAddress.MapToIPv6(), reBind ? m_listenPort : m_configuration.Port);
-			m_socket.Bind(ep);
+            m_socket.Bind(ep);
 
 			try
 			{

Libraries/Lidgren.Network/NetPeer.LatencySimulation.cs

@@ -135,7 +135,10 @@ namespace Lidgren.Network
 		internal bool ActuallySendPacket(byte[] data, int numBytes, NetEndPoint target, out bool connectionReset)
 		{
 			connectionReset = false;
-			IPAddress ba = default(IPAddress);
+
+            target = NetUtility.MapToIPv6(target);
+
+            IPAddress ba = default(IPAddress);
 			try
 			{
 				ba = NetUtility.GetCachedBroadcastAddress();

Libraries/Lidgren.Network/NetPeer.cs

@@ -121,8 +121,8 @@ namespace Lidgren.Network
 			m_connections = new List<NetConnection>();
 			m_connectionLookup = new Dictionary<NetEndPoint, NetConnection>();
 			m_handshakes = new Dictionary<NetEndPoint, NetConnection>();
-			m_senderRemote = (EndPoint)new NetEndPoint(IPAddress.Any, 0);
+            m_senderRemote = (EndPoint)new NetEndPoint(IPAddress.IPv6Any, 0);
-			m_status = NetPeerStatus.NotRunning;
+            m_status = NetPeerStatus.NotRunning;
 			m_receivedFragmentGroups = new Dictionary<NetConnection, Dictionary<int, ReceivedFragmentGroup>>();	
 		}
 
@@ -293,7 +293,9 @@ namespace Lidgren.Network
 			if (remoteEndPoint == null)
 				throw new ArgumentNullException("remoteEndPoint");
 
-			lock (m_connections)
+            remoteEndPoint = NetUtility.MapToIPv6(remoteEndPoint);
+
+            lock (m_connections)
 			{
 				if (m_status == NetPeerStatus.NotRunning)
 					throw new NetException("Must call Start() first");

Libraries/Lidgren.Network/NetPeerConfiguration.cs

@@ -93,8 +93,8 @@ namespace Lidgren.Network
 			//
 			m_disabledTypes = NetIncomingMessageType.ConnectionApproval | NetIncomingMessageType.UnconnectedData | NetIncomingMessageType.VerboseDebugMessage | NetIncomingMessageType.ConnectionLatencyUpdated | NetIncomingMessageType.NatIntroductionSuccess;
 			m_networkThreadName = "Lidgren network thread";
-			m_localAddress = IPAddress.Any;
+            m_localAddress = IPAddress.IPv6Any;
-			m_broadcastAddress = IPAddress.Broadcast;
+            m_broadcastAddress = IPAddress.Broadcast;
 			var ip = NetUtility.GetBroadcastAddress();
 			if (ip != null)
 			{
@@ -326,11 +326,10 @@ namespace Lidgren.Network
 				m_suppressUnreliableUnorderedAcks = value;
 			}
 		}
-
+        /// <summary>
-		/// <summary>
+        /// Gets or sets the local ip address to bind to. Defaults to <see cref="IPAddress.IPv6Any"/>. Cannot be changed once NetPeer is initialized.
-		/// Gets or sets the local ip address to bind to. Defaults to IPAddress.Any. Cannot be changed once NetPeer is initialized.
+        /// </summary>
-		/// </summary>
+        public IPAddress LocalAddress
-		public IPAddress LocalAddress
 		{
 			get { return m_localAddress; }
 			set

Libraries/Lidgren.Network/NetUtility.cs

@@ -98,8 +98,8 @@ namespace Lidgren.Network
 			NetAddress ipAddress = null;
 			if (NetAddress.TryParse(ipOrHost, out ipAddress))
 			{
-				if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
+                if (ipAddress.AddressFamily == AddressFamily.InterNetwork || ipAddress.AddressFamily == AddressFamily.InterNetworkV6)
-				{
+                {
 					callback(ipAddress);
 					return;
 				}
@@ -139,7 +139,7 @@ namespace Lidgren.Network
 					// check each entry for a valid IP address
 					foreach (var ipCurrent in entry.AddressList)
 					{
-						if (ipCurrent.AddressFamily == AddressFamily.InterNetwork)
+						if (ipCurrent.AddressFamily == AddressFamily.InterNetwork || ipCurrent.AddressFamily == AddressFamily.InterNetworkV6)
 						{
 							callback(ipCurrent);
 							return;
@@ -176,22 +176,22 @@ namespace Lidgren.Network
 			NetAddress ipAddress = null;
 			if (NetAddress.TryParse(ipOrHost, out ipAddress))
 			{
-				if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
+                if (ipAddress.AddressFamily == AddressFamily.InterNetwork || ipAddress.AddressFamily == AddressFamily.InterNetworkV6)
-					return ipAddress;
+                    return ipAddress;
-				throw new ArgumentException("This method will not currently resolve other than ipv4 addresses");
+                throw new ArgumentException("This method will not currently resolve other than IPv4 or IPv6 addresses");
-			}
+            }
 
-			// ok must be a host name
+            // ok must be a host name
-			try
+            try
 			{
 				var addresses = Dns.GetHostAddresses(ipOrHost);
 				if (addresses == null)
 					return null;
 				foreach (var address in addresses)
 				{
-					if (address.AddressFamily == AddressFamily.InterNetwork)
+                    if (address.AddressFamily == AddressFamily.InterNetwork || address.AddressFamily == AddressFamily.InterNetworkV6)
-						return address;
+                        return address;
-				}
+                }
 				return null;
 			}
 			catch (SocketException ex)
@@ -453,5 +453,17 @@ namespace Lidgren.Network
 			// this is defined in the platform specific files
 			return ComputeSHAHash(bytes, 0, bytes.Length);
 		}
-	}
+
+        /// <summary>
+        /// Maps the IPEndPoint object to an IPv6 address, if it is currently mapped to an IPv4 address.
+        /// </summary>
+        internal static IPEndPoint MapToIPv6(IPEndPoint endPoint)
+        {
+            if (endPoint.AddressFamily == AddressFamily.InterNetwork)
+            {
+                return new IPEndPoint(endPoint.Address.MapToIPv6(), endPoint.Port);
+            }
+            return endPoint;
+        }
+    }
 }