Client/server handshake. Only checks that the correct mods are active.

OpenRA.Game/Network/Handshake.cs

@@ -0,0 +1,47 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see LICENSE.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Network
+{
+	public class HandshakeResponse
+	{
+		public string Name;
+		public Color Color1;
+		public Color Color2;
+		public string[] Mods = { "ra" };	// mod names
+		public string Password;
+		
+		public string Serialize()
+		{
+			var data = new List<MiniYamlNode>();
+			data.Add(new MiniYamlNode("Handshake", FieldSaver.Save(this)));
+			System.Console.WriteLine("Serializing handshake response:");
+			System.Console.WriteLine(data.WriteToString());
+			
+			return data.WriteToString();
+		}
+
+		public static HandshakeResponse Deserialize(string data)
+		{
+			System.Console.WriteLine("Deserializing handshake response:");
+			System.Console.WriteLine(data);
+			
+			var handshake = new HandshakeResponse();
+			var ys = MiniYaml.FromString(data);
+			FieldLoader.Load(handshake, ys.First().Value);
+			return handshake;
+		}
+	}
+}

OpenRA.Game/Network/Order.cs

@@ -195,6 +195,11 @@ namespace OpenRA
 			return new Order("TeamChat", null, false) { IsImmediate = true, TargetString = text };
 		}
 		
+		public static Order HandshakeResponse(string text)
+		{
+			return new Order("HandshakeResponse", null, false) { IsImmediate = true, TargetString = text };
+		}
+		
 		public static Order Command(string text)
 		{
 			return new Order("Command", null, false) { IsImmediate = true, TargetString = text };

OpenRA.Game/Network/UnitOrders.cs

@@ -11,6 +11,7 @@
 using System.Drawing;
 using System.Linq;
 using OpenRA.Traits;
+using System;
 
 namespace OpenRA.Network
 {
@@ -96,8 +97,37 @@ namespace OpenRA.Network
 						Game.StartGame(orderManager.LobbyInfo.GlobalSettings.Map);
 						break;
 					}
+				
+				case "HandshakeRequest":
+				{
+					Console.WriteLine("Client: Recieved HandshakeRequest");
+					// Check valid mods/versions
+					var serverInfo = Session.Deserialize(order.TargetString);
+					var serverMods = serverInfo.GlobalSettings.Mods;
+					var localMods = orderManager.LobbyInfo.GlobalSettings.Mods;
+				
+					// TODO: Check that the map exists on the client
+					
+					// Todo: Display a friendly dialog
+					if (serverMods.SymmetricDifference(localMods).Count() > 0)
+						throw new InvalidOperationException("Version mismatch. Client: `{0}`, Server: `{1}`"
+					                                    .F(string.Join(",",localMods), string.Join(",",serverMods)));
+					
+					var response = new HandshakeResponse()
+					{
+						Name = "Test Player",
+						Color1 = Color.PaleGreen,
+						Color2 = Color.PeachPuff,
+						Mods = localMods,
+						Password = "Foo"
+					};
+					orderManager.IssueOrder(Order.HandshakeResponse(response.Serialize()));
+					break;
+				}
+				
 				case "SyncInfo":
 					{
+						Console.WriteLine("Client: Recieved SyncInfo");
 						orderManager.LobbyInfo = Session.Deserialize(order.TargetString);
 
 						if (orderManager.FramesAhead != orderManager.LobbyInfo.GlobalSettings.OrderLatency