Feat (Conf\BG): BG Star Area Cheat Countermeasure

If a player cheats by teleporting outside of the start spot before the BG starts, a counter measure will applied and log (if WriteLog is enabled) and send the player to a void spot for a few seconds and return them back in the team start spot

conf/Anticheat.conf.dist

@@ -160,3 +160,15 @@ Anticheat.ReportsForJail = 70
 Anticheat.AnnounceKick = 0
 Anticheat.AnnounceBan = 0
 Anticheat.AnnounceJail = 0
+
+#     Anticheat Counter Measures
+#
+#     Anticheat.BG.StartAreaTeleport
+#
+#       Description: Sends player back to start position if player cheats and teleports out of start spot
+#                    before the BG begins.
+#       Default:    0 - (Disabled)
+#                   1 - (Enabled)
+#
+
+Anticheat.BG.StartAreaTeleport = 0

src/AnticheatMgr.cpp

@@ -936,6 +936,30 @@ void AnticheatMgr::BGreport(Player* player)
     BuildReport(player, TELEPORT_HACK_REPORT);
 }
 
+Position const* AnticheatMgr::GetTeamStartPosition(TeamId teamId) const
+{
+    return &_startPosition[teamId];
+}
+
+void AnticheatMgr::CheckStartPositions(Player* player)
+{
+    if (!sConfigMgr->GetOption<bool>("Anticheat.BG.StartAreaTeleport", true))
+        return;
+
+    Position pos = player->GetPosition();
+    Position const* startPos = GetTeamStartPosition(player->GetBgTeamId());
+
+    if (pos.GetExactDistSq(!startPos))
+    {
+        if (sConfigMgr->GetOption<bool>("Anticheat.WriteLog", true))
+        {
+            LOG_INFO("anticheat.module", "ANTICHEAT COUNTER MEASURE:: Sending {} back to start location (BG Map: {}) (possible exploit)", player->GetName(), player->GetMapId());
+        }
+        player->TeleportTo(player->GetMapId(), startPos->GetPositionX(), startPos->GetPositionY(), startPos->GetPositionZ(), startPos->GetOrientation());
+    }
+
+}
+
 void AnticheatMgr::BGStartExploit(Player* player, MovementInfo movementInfo)
 {
     if (!sConfigMgr->GetOption<bool>("Anticheat.DetectBGStartHack", true))
@@ -957,12 +981,14 @@ void AnticheatMgr::BGStartExploit(Player* player, MovementInfo movementInfo)
                         (player->GetTeamId() == TEAM_ALLIANCE && movementInfo.pos.GetPositionY() < -525.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                     if ((player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() > -535.0f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionX() > -1283.33f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() < -716.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                 }
             }
@@ -974,6 +1000,7 @@ void AnticheatMgr::BGStartExploit(Player* player, MovementInfo movementInfo)
             if (!(movementInfo.HasMovementFlag(MOVEMENTFLAG_FALLING_FAR) || m_Players[key].GetLastOpcode() == MSG_MOVE_JUMP) && movementInfo.pos.GetPositionZ() > 380.0f)
             {
                 sAnticheatMgr->BGreport(player);
+                sAnticheatMgr->CheckStartPositions(player);
             }
             if (Battleground* bg = player->GetBattleground())
             {
@@ -985,12 +1012,14 @@ void AnticheatMgr::BGStartExploit(Player* player, MovementInfo movementInfo)
                         (player->GetTeamId() == TEAM_ALLIANCE && movementInfo.pos.GetPositionY() < 1450.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                     if ((player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionX() > 957.0f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() < 1416.0f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() > 1466.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                 }
             }
@@ -1008,11 +1037,13 @@ void AnticheatMgr::BGStartExploit(Player* player, MovementInfo movementInfo)
                         (player->GetTeamId() == TEAM_ALLIANCE && movementInfo.pos.GetPositionY() > 1361.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                     if ((player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionX() > 730.0f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() > 724.8f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                 }
             }
@@ -1030,12 +1061,14 @@ void AnticheatMgr::BGStartExploit(Player* player, MovementInfo movementInfo)
                         (player->GetTeamId() == TEAM_ALLIANCE && movementInfo.pos.GetPositionY() < 1584.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                     if ((player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionX() > 1816.0f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() > 1554.0f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() < 1526.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                 }
             }
@@ -1053,12 +1086,14 @@ void AnticheatMgr::BGStartExploit(Player* player, MovementInfo movementInfo)
                         (player->GetTeamId() == TEAM_ALLIANCE && movementInfo.pos.GetPositionY() > -760.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                     if ((player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionX() < 1147.8f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() < -855.0f) ||
                         (player->GetTeamId() == TEAM_HORDE && movementInfo.pos.GetPositionY() > -676.0f))
                     {
                         sAnticheatMgr->BGreport(player);
+                        sAnticheatMgr->CheckStartPositions(player);
                     }
                 }
             }

src/AnticheatMgr.h

@@ -109,6 +109,8 @@ class AnticheatMgr
         void AnticheatDeleteCommand(ObjectGuid guid);
         void AnticheatPurgeCommand(ChatHandler* handler);
         void ResetDailyReportStates();
+        void SetMapId(uint32 MapID) { m_MapId = MapID; }
+        [[nodiscard]] uint32 GetMapId() const { return m_MapId; }
 
     private:
         void SpeedHackDetection(Player* player, MovementInfo movementInfo);
@@ -125,6 +127,7 @@ class AnticheatMgr
         void AntiKnockBackHackDetection(Player* player, MovementInfo movementInfo);
         void NoFallDamageDetection(Player* player, MovementInfo movementInfo);
         void BGreport(Player* player);
+        void CheckStartPositions(Player* player);
         void BGStartExploit(Player* player, MovementInfo movementInfo);
         void BuildReport(Player* player,uint16 reportType);
         bool MustCheckTempReports(uint8 type);
@@ -132,6 +135,9 @@ class AnticheatMgr
         uint32 _alertFrequency = 0;
         uint32 _assignedspeeddiff = 0;
         uint32 _updateCheckTimer = 4000;
+        uint32 m_MapId;
+        std::array<Position, PVP_TEAMS_COUNT> _startPosition;
+        Position const* GetTeamStartPosition(TeamId teamId) const;
         AnticheatPlayersDataMap m_Players;                        ///< Player data
 };