[9573] Add config option Network.KickOnBadPacket. If enabled, player will be kicked on badly formatted (wrong structure) packet.

src/game/World.cpp

@@ -725,6 +725,8 @@ void World::LoadConfigSettings(bool reload)
 
     setConfig(CONFIG_BOOL_OFFHAND_CHECK_AT_TALENTS_RESET, "OffhandCheckAtTalentsReset", false);
 
+    setConfig(CONFIG_BOOL_KICK_PLAYER_ON_BAD_PACKET, "Network.KickOnBadPacket", false);
+
     if(int clientCacheId = sConfig.GetIntDefault("ClientCacheVersion", 0))
     {
         // overwrite DB/old value

src/game/World.h

@@ -301,6 +301,7 @@ enum eConfigBoolValues
     CONFIG_BOOL_ARENA_AUTO_DISTRIBUTE_POINTS,
     CONFIG_BOOL_ARENA_QUEUE_ANNOUNCER_JOIN,
     CONFIG_BOOL_ARENA_QUEUE_ANNOUNCER_EXIT,
+    CONFIG_BOOL_KICK_PLAYER_ON_BAD_PACKET,
     CONFIG_BOOL_VALUE_COUNT
 };
 

src/game/WorldSession.cpp

@@ -250,13 +250,21 @@ bool WorldSession::Update(uint32 /*diff*/)
         }
         catch (ByteBufferException &)
         {
-            sLog.outError("WorldSession::Update ByteBufferException occured while parsing a packet (opcode: %u) from client %s, accountid=%i. Skipped packet.",
+            sLog.outError("WorldSession::Update ByteBufferException occured while parsing a packet (opcode: %u) from client %s, accountid=%i.",
                     packet->GetOpcode(), GetRemoteAddress().c_str(), GetAccountId());
             if(sLog.IsOutDebug())
             {
                 sLog.outDebug("Dumping error causing packet:");
                 packet->hexlike();
             }
+
+            if (sWorld.getConfig(CONFIG_BOOL_KICK_PLAYER_ON_BAD_PACKET))
+            {
+                sLog.outDetail("Disconnecting session [account id %u / address %s] for badly formatted packet.",
+                    GetAccountId(), GetRemoteAddress().c_str());
+
+                KickPlayer();
+            }
         }
 
         delete packet;

src/game/WorldSocket.cpp

@@ -713,7 +713,7 @@ int WorldSocket::ProcessIncoming (WorldPacket* new_pct)
     }
     catch (ByteBufferException &)
     {
-        sLog.outError("WorldSocket::ProcessIncoming ByteBufferException occured while parsing an instant handled packet (opcode: %u) from client %s, accountid=%i. Disconnected client.",
+        sLog.outError("WorldSocket::ProcessIncoming ByteBufferException occured while parsing an instant handled packet (opcode: %u) from client %s, accountid=%i.",
                 opcode, GetRemoteAddress().c_str(), m_Session?m_Session->GetAccountId():-1);
         if(sLog.IsOutDebug())
         {
@@ -721,8 +721,16 @@ int WorldSocket::ProcessIncoming (WorldPacket* new_pct)
             new_pct->hexlike();
         }
 
+        if (sWorld.getConfig(CONFIG_BOOL_KICK_PLAYER_ON_BAD_PACKET))
+        {
+            sLog.outDetail("Disconnecting session [account id %i / address %s] for badly formatted packet.",
+                m_Session?m_Session->GetAccountId():-1, GetRemoteAddress().c_str());
+
             return -1;
         }
+        else
+            return 0;
+    }
 
     ACE_NOTREACHED (return 0);
 }

src/mangosd/mangosd.conf.dist.in

@@ -1348,12 +1348,18 @@ Arena.ArenaSeason.InProgress = 1
 #         Default: 0 (enable Nagle algorithm, less traffic, more latency)
 #                  1 (TCP_NO_DELAY, disable Nagle algorithm, more traffic but less latency)
 #
+#    Network.KickOnBadPacket
+#         Kick player on bad packet format.
+#         Default: 0 - do not kick
+#                  1 - kick
+#
 ###################################################################################################################
 
 Network.Threads = 1
 Network.OutKBuff = -1
 Network.OutUBuff = 65536
 Network.TcpNodelay = 1
+Network.KickOnBadPacket = 0
 
 ###################################################################################################################
 # CONSOLE, REMOTE ACCESS AND SOAP

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "9572"
+ #define REVISION_NR "9573"
 #endif // __REVISION_NR_H__