Hacked clients can't send chat messages from other characters anymore

Also added sendername as userdata in chat messages, for now it's not used for anything but we'll probably find something where this is useful

Subsurface/Source/Networking/ChatMessage.cs

@@ -116,21 +116,46 @@ namespace Barotrauma.Networking
         
         public void WriteNetworkMessage(NetOutgoingMessage msg)
         {
-            msg.WriteRangedInteger(0, Enum.GetValues(typeof(ChatMessageType)).Length, (byte)Type);
-            msg.Write(Sender == null ? (ushort)0 : Sender.ID);
-            msg.Write(SenderName);
+            msg.WriteRangedInteger(0, Enum.GetValues(typeof(ChatMessageType)).Length, (byte)Type);
+            if (GameMain.Server != null)
+            {
+                msg.Write(Sender == null ? (ushort)0 : Sender.ID);
+                msg.Write(SenderName);
+            }
 
             msg.Write(Text);  
         }
 
         public static ChatMessage ReadNetworkMessage(NetBuffer msg)
         {
-            ChatMessageType type = (ChatMessageType)msg.ReadRangedInteger(0, Enum.GetValues(typeof(ChatMessageType)).Length);
-            ushort senderId = msg.ReadUInt16();
-            string senderName = msg.ReadString();
+            ChatMessageType type = (ChatMessageType)msg.ReadRangedInteger(0, Enum.GetValues(typeof(ChatMessageType)).Length);
+            string senderName="";
+            Character character = null;
+            if (GameMain.Server == null)
+            {
+                ushort senderId = msg.ReadUInt16();
+                character = Entity.FindEntityByID(senderId) as Character;
+                senderName = msg.ReadString();
+            }
+            else
+            {
+                NetIncomingMessage inc = msg as NetIncomingMessage;
+                if (inc == null) return null;
+                Client sender = GameMain.Server.ConnectedClients.Find(x => x.Connection == inc.SenderConnection);
+                if (sender == null) return null;
+                character = sender.Character;
+                if (character != null)
+                {
+                    senderName = character.Name;
+                }
+                else
+                {
+                    senderName = sender.name;
+                }
+            }
             string text = msg.ReadString();
 
-            return new ChatMessage(senderName, text, type, Entity.FindEntityByID(senderId) as Character);
+            return new ChatMessage(senderName, text, type, character);
         }
     }
 }

Subsurface/Source/Networking/Client.cs

@@ -93,17 +93,17 @@ namespace Barotrauma.Networking
                 name = name.Substring(0, 20);
             }
             string rName = "";
-            for (int i=0;i<name.Length;i++)
-            {
-                if (name[i] < 32 || name[i] > 126)
-                {
-                    //TODO: allow safe unicode characters, this is just to prevent players from taking names that look similar but aren't the same
-                    rName += '?';
-                }
-                else
-                {
-                    rName += name[i];
-                }
+            for (int i=0;i<name.Length;i++)
+            {
+                if (name[i] < 32 || name[i] > 126)
+                {
+                    //TODO: allow safe unicode characters, this is just to prevent players from taking names that look similar but aren't the same
+                    rName += '?';
+                }
+                else
+                {
+                    rName += name[i];
+                }
             }
 
             return rName;
@@ -125,7 +125,7 @@ namespace Barotrauma.Networking
         }
 
         public bool HasPermission(ClientPermissions permission)
-        {
+        {
             return false; //Permissions.HasFlag(permission);
         }
 

Subsurface/Source/Networking/GameServer.cs

@@ -1443,6 +1443,7 @@ namespace Barotrauma.Networking
         {
             Client sender = connectedClients.Find(x => x.Connection == inc.SenderConnection);
             ChatMessage message = ChatMessage.ReadNetworkMessage(inc);
+            if (message == null) return;
 
             List<Client> recipients = new List<Client>();
 
@@ -1494,7 +1495,7 @@ namespace Barotrauma.Networking
             if (similarity > 5.0f)
             {
                 sender.ChatSpamCount++;
-
+                
                 if (sender.ChatSpamCount > 3)
                 {
                     //kick for spamming too much
@@ -1633,10 +1634,10 @@ namespace Barotrauma.Networking
                 headSpriteId = 0;
             }
 
-            if (sender.characterInfo != null)
-            {
-                //clients can't change their character's name once it's been set
-                name = sender.characterInfo.Name;
+            if (sender.characterInfo != null)
+            {
+                //clients can't change their character's name once it's been set
+                name = sender.characterInfo.Name;
             }
 
             List<JobPrefab> jobPreferences = new List<JobPrefab>();

Subsurface/Source/Networking/GameServerLogin.cs

@@ -81,10 +81,10 @@ namespace Barotrauma.Networking
                 return;
             }
 
-            if (ConnectedClients.Count>=config.MaximumConnections)
-            {
+            if (ConnectedClients.Count>=config.MaximumConnections)
+            {
                 inc.SenderConnection.Disconnect("Server full");
-                return;
+                return;
             }
 
             DebugConsole.NewMessage("New player has joined the server", Color.White);

Subsurface/Source/Networking/NetworkMember.cs

@@ -309,6 +309,7 @@ namespace Barotrauma.Networking
                 ((chatBox.CountChildren % 2) == 0) ? Color.Transparent : Color.Black * 0.1f, message.Color,
                 Alignment.Left, null, null, true);
             msg.Font = GUI.SmallFont;
+            msg.UserData = message.SenderName;
 
             msg.Padding = new Vector4(20.0f, 0, 0, 0);