Core/Vehicles: In CMSG_ATTACKSWING check if current vehicle seat flags permit attacking before updating standstate etc. Client also checks this.

Furthermore, removed incorrect vehicle_seat_flag_b definition and added an unknown vehicle_seat_flag that was found in the client.

src/server/game/Server/Protocol/Handlers/CombatHandler.cpp

@@ -23,13 +23,15 @@
 #include "ObjectAccessor.h"
 #include "CreatureAI.h"
 #include "ObjectDefines.h"
+#include "Vehicle.h"
+#include "VehicleDefines.h"
 
-void WorldSession::HandleAttackSwingOpcode(WorldPacket & recv_data)
+void WorldSession::HandleAttackSwingOpcode(WorldPacket& recv_data)
 {
     uint64 guid;
     recv_data >> guid;
 
-    sLog->outStaticDebug("WORLD: Recvd CMSG_ATTACKSWING Message guidlow:%u guidhigh:%u", GUID_LOPART(guid), GUID_HIPART(guid));
+    sLog->outDebug(LOG_FILTER_PACKETIO, "WORLD: Recvd CMSG_ATTACKSWING Message guidlow:%u guidhigh:%u", GUID_LOPART(guid), GUID_HIPART(guid));
 
     Unit* pEnemy = ObjectAccessor::GetUnit(*_player, guid);
 
@@ -47,6 +49,20 @@ void WorldSession::HandleAttackSwingOpcode(WorldPacket & recv_data)
         return;
     }
 
+    //! Client explicitly checks the following before sending CMSG_ATTACKSWING packet,
+    //! so we'll place the same check here. Note that it might be possible to reuse this snippet
+    //! in other places as well.
+    if (Vehicle* vehicle = _player->GetVehicle())
+    {
+        VehicleSeatEntry const* seat = vehicle->GetSeatForPassenger(_player);
+        ASSERT(seat);
+        if (!(seat->m_flags & VEHICLE_SEAT_FLAG_CAN_ATTACK))
+        {
+            SendAttackStop(pEnemy);
+            return;
+        }
+    }
+
     _player->Attack(pEnemy, true);
 }
 
@@ -55,7 +71,7 @@ void WorldSession::HandleAttackStopOpcode(WorldPacket & /*recv_data*/)
     GetPlayer()->AttackStop();
 }
 
-void WorldSession::HandleSetSheathedOpcode(WorldPacket & recv_data)
+void WorldSession::HandleSetSheathedOpcode(WorldPacket& recv_data)
 {
     uint32 sheathed;
     recv_data >> sheathed;
@@ -79,4 +95,3 @@ void WorldSession::SendAttackStop(Unit const* enemy)
     data << uint32(0);                                      // unk, can be 1 also
     SendPacket(&data);
 }
-