Nat introduction added; sample added (not finished yet)

Lidgren.Network/Lidgren.Network.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProductVersion>9.0.21022</ProductVersion>
+    <ProductVersion>9.0.30729</ProductVersion>
     <SchemaVersion>2.0</SchemaVersion>
     <ProjectGuid>{FA245447-5F23-4AA1-BD5F-8D2DDF33CFBD}</ProjectGuid>
     <OutputType>Library</OutputType>
@@ -65,6 +65,7 @@
     <Compile Include="NetIncomingMessage.Write.cs" />
     <Compile Include="NetIncomingMessageType.cs" />
     <Compile Include="NetMessageType.cs" />
+    <Compile Include="NetNatIntroduction.cs" />
     <Compile Include="NetOutgoingMessage.cs" />
     <Compile Include="NetOutgoingMessage.Write.cs" />
     <Compile Include="NetPeer.ConnectionApproval.cs" />

Lidgren.Network/NetIncomingMessage.Write.cs

@@ -446,7 +446,6 @@ namespace Lidgren.Network
 		/// <summary>
 		/// Writes an endpoint description
 		/// </summary>
-		/// <param name="endPoint"></param>
 		internal void Write(IPEndPoint endPoint)
 		{
 			byte[] bytes = endPoint.Address.GetAddressBytes();

Lidgren.Network/NetIncomingMessageType.cs

@@ -41,5 +41,6 @@ namespace Lidgren.Network
 		DebugMessage = 1 << 8,			// Data (string)
 		WarningMessage = 1 << 9,		// Data (string)
 		ErrorMessage = 1 << 10,			// Data (string)
+		NatIntroduction = 1 << 11,		// IPEndPoint
 	}
 }

Lidgren.Network/NetMessageType.cs

@@ -48,7 +48,8 @@ namespace Lidgren.Network
 		Disconnect = 8,
 		Discovery = 9,
 		DiscoveryResponse = 10,
-		NatIntroduction = 11,
+		NatPunchMessage = 11,
+		NatIntroduction = 12,
 	}
 
 	internal enum NetMessageType : byte

Lidgren.Network/NetNatIntroduction.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Net;
+
+namespace Lidgren.Network
+{
+	public partial class NetPeer
+	{
+		public void Introduce(IPEndPoint host, IPEndPoint client)
+		{
+			// send message to client
+			NetOutgoingMessage msg = CreateMessage(10);
+			msg.Write(false);
+			msg.WritePadBits();
+			msg.Write(host);
+			SendUnconnectedLibraryMessage(msg, NetMessageLibraryType.NatIntroduction, client);
+
+			// send message to host
+			msg = CreateMessage(10);
+			msg.Write(true);
+			msg.WritePadBits();
+			msg.Write(client);
+			SendUnconnectedLibraryMessage(msg, NetMessageLibraryType.NatIntroduction, host);
+		}
+
+		private void HandleNatIntroduction(int ptr, IPEndPoint senderEndpoint)
+		{
+			VerifyNetworkThread();
+
+			// read intro
+			NetIncomingMessage tmp = new NetIncomingMessage(m_receiveBuffer, 1000); // never mind length
+			tmp.Position = (ptr * 8);
+			bool isHost = (tmp.ReadByte() == 0 ? false : true);
+			IPEndPoint ep = tmp.ReadIPEndpoint();
+
+			// quickly; send nat punch
+			NetOutgoingMessage punch = CreateMessage(0);
+			SendUnconnectedLibraryMessage(punch, NetMessageLibraryType.NatPunchMessage, ep);
+
+			if (!isHost)
+			{
+				NetIncomingMessage intro = CreateIncomingMessage(NetIncomingMessageType.NatIntroduction, 10);
+				intro.Write(ep);
+				intro.m_senderEndpoint = senderEndpoint;
+				ReleaseMessage(intro);
+			}
+		}
+	}
+}

Lidgren.Network/NetOutgoingMessage.Write.cs

@@ -509,8 +509,7 @@ namespace Lidgren.Network
 		/// <summary>
 		/// Writes an endpoint description
 		/// </summary>
-		/// <param name="endPoint"></param>
-		internal void Write(IPEndPoint endPoint)
+		public void Write(IPEndPoint endPoint)
 		{
 			byte[] bytes = endPoint.Address.GetAddressBytes();
 			Write((byte)bytes.Length);

Lidgren.Network/NetPeer.Internal.cs

@@ -418,6 +418,12 @@ namespace Lidgren.Network
 
 			int payloadLengthBytes = NetUtility.BytesToHoldBits(payloadLengthBits);
 
+			//
+			// Handle nat introduction
+			//
+			if (libType == NetMessageLibraryType.NatIntroduction)
+				HandleNatIntroduction(ptr, senderEndpoint);
+
 			//
 			// Handle Discovery
 			//