feat (New Detection) Ignore Z-Axis Check

So this happens when a player is able to block their z-axis from updating with the server. This achieves the ability to run across the sky while avoiding fly hack detection. Usually get on a high object and then run accross, their x and y will chance but their elevation will not.
Warning: At times there will be false positives due to "pot holes" in the vmaps. This can not be avoided unless someone wants to redo all the maps with a better map extractor pr or rework all the maps in recast demo.

conf/Anticheat.conf.dist

@@ -72,6 +72,7 @@ Anticheat.DetectSpeedHack = 1
 Anticheat.DetectClimbHack = 1
 Anticheat.DetectTelePortHack = 1
 Anticheat.IgnoreControlHack = 1
+Anticheat.DetectZaxisHack =1
 
 #     Anticheat.StricterFlyHackCheck
 #       Description: Checks moveflag ascending (may give false positives)

src/AnticheatMgr.cpp

@@ -186,6 +186,55 @@ void AnticheatMgr::IgnoreControlHackDetection(Player* player, MovementInfo movem
     }
 }
 
+void AnticheatMgr::ZAxisHackDetection(Player* player, MovementInfo movementInfo)
+{
+    if (!sConfigMgr->GetOption<bool>("Anticheat.DetectZaxisHack", true))
+        return;
+
+    if (!movementInfo.HasMovementFlag(MOVEMENTFLAG_CAN_FLY) && !movementInfo.HasMovementFlag(MOVEMENTFLAG_FLYING))
+    {
+        ObjectGuid key = player->GetGUID();
+
+        float lastX = m_Players[key].GetLastMovementInfo().pos.GetPositionX();
+        float newX = movementInfo.pos.GetPositionX();
+
+        float lastY = m_Players[key].GetLastMovementInfo().pos.GetPositionY();
+        float newY = movementInfo.pos.GetPositionY();
+
+        float xDiff = fabs(lastX - newX);
+        float yDiff = fabs(lastY - newY);
+
+        float groundZ_vmap = player->GetMap()->GetHeight(player->GetPositionX(), player->GetPositionY(), player->GetPositionZ(), true, 50.0f);
+        float groundZ_dyntree = player->GetMap()->GetDynamicMapTree().getHeight(player->GetPositionX(), player->GetPositionY(), player->GetPositionZ(), 50.0f, player->GetPhaseMask());
+        float groundZ = std::max<float>(groundZ_vmap, groundZ_dyntree);
+
+        if ((xDiff || yDiff) && m_Players[key].GetLastMovementInfo().pos.GetPositionZ() == movementInfo.pos.GetPositionZ()
+            && player->GetPositionZ() >= groundZ + 5.0f)
+        {
+            if (m_Players[key].GetTotalReports() > sConfigMgr->GetOption<uint32>("Anticheat.ReportsForIngameWarnings", 70))
+            {
+                // display warning at the center of the screen, hacky way?
+                std::string str = "";
+                str = "|cFFFFFC00[Playername:|cFF00FFFF[|cFF60FF00" + std::string(player->GetName().c_str()) + "|cFF00FFFF] Possible Ignore Zaxis Hack Detected!";
+                WorldPacket data(SMSG_NOTIFICATION, (str.size() + 1));
+                data << str;
+                sWorld->SendGlobalGMMessage(&data);
+                // need better way to limit chat spam
+                if (m_Players[key].GetTotalReports() >= sConfigMgr->GetOption<uint32>("Anticheat.ReportinChat.Min", 70) && m_Players[key].GetTotalReports() <= sConfigMgr->GetOption<uint32>("Anticheat.ReportinChat.Max", 80))
+                {
+                    sWorld->SendGMText(LANG_ANTICHEAT_TELEPORT, player->GetName().c_str());
+                }
+            }
+            if (sConfigMgr->GetOption<bool>("Anticheat.WriteLog", true))
+            {
+                LOG_INFO("module", "AnticheatMgr:: Ignore Zaxis Hack detected player {} ({})", player->GetName(), player->GetGUID().ToString());
+            }
+
+            BuildReport(player, ZAXIS_HACK_REPORT);
+        }
+    }
+}
+
 void AnticheatMgr::TeleportHackDetection(Player* player, MovementInfo movementInfo)
 {
     if (!sConfigMgr->GetOption<bool>("Anticheat.DetectTelePortHack", true))
@@ -257,6 +306,7 @@ void AnticheatMgr::StartHackDetection(Player* player, MovementInfo movementInfo,
     ClimbHackDetection(player, movementInfo, opcode);
     TeleportHackDetection(player, movementInfo);
     IgnoreControlHackDetection(player, movementInfo);
+    ZAxisHackDetection(player, movementInfo);
     m_Players[key].SetLastMovementInfo(movementInfo);
     m_Players[key].SetLastOpcode(opcode);
 }
@@ -470,6 +520,9 @@ bool AnticheatMgr::MustCheckTempReports(uint8 type)
     if (type == IGNORE_CONTROL_REPORT)
         return false;
 
+    if (type == ZAXIS_HACK_REPORT)
+        return false;
+
     return true;
 }
 

src/AnticheatMgr.h

@@ -36,8 +36,8 @@ enum ReportTypes
     TELEPORT_PLANE_HACK_REPORT = 4,
     CLIMB_HACK_REPORT = 5,
     TELEPORT_HACK_REPORT = 6,
-    IGNORE_CONTROL_REPORT = 7
-
+    IGNORE_CONTROL_REPORT = 7,
+    ZAXIS_HACK_REPORT = 8
    // MAX_REPORT_TYPES
 };
 
@@ -50,7 +50,8 @@ enum DetectionTypes
     TELEPORT_PLANE_HACK_DETECTION   = 16,
     CLIMB_HACK_DETECTION            = 32,
     TELEPORT_HACK_DETECTION         = 64,
-    IGNORE_CONTROL_DETECTION        = 128
+    IGNORE_CONTROL_DETECTION        = 128,
+    ZAXIS_HACK_DETECTION            = 256
 };
 
 // GUID is the key.
@@ -92,6 +93,7 @@ class AnticheatMgr
         void ClimbHackDetection(Player* player,MovementInfo movementInfo,uint32 opcode);
         void TeleportHackDetection(Player* player, MovementInfo movementInfo);
         void IgnoreControlHackDetection(Player* player, MovementInfo movementInfo);
+        void ZAxisHackDetection(Player* player, MovementInfo movementInfo);
         void BuildReport(Player* player,uint16 reportType);
 
         bool MustCheckTempReports(uint8 type);