Add undocumented config option to disable rapid fire anticheat

This quick hack has been around for a while, so we might as well make it
configurable.

Also updated tdata reference.

src/Combat.cpp

@@ -56,14 +56,10 @@ static std::pair<int,int> getDamage(int attackPower, int defensePower, bool shou
     return ret;
 }
 
-static void pcAttackNpcs(CNSocket *sock, CNPacketData *data) {
+static bool checkRapidFire(CNSocket *sock, int targetCount) {
-    auto pkt = (sP_CL2FE_REQ_PC_ATTACK_NPCs*)data->buf;
     Player *plr = PlayerManager::getPlayer(sock);
-    auto targets = (int32_t*)data->trailers;
-
-    // rapid fire anti-cheat
-    // TODO: move this out of here, when generalizing packet frequency validation
     time_t currTime = getTime();
+
     if (currTime - plr->lastShot < plr->fireRate * 80)
         plr->suspicionRating += plr->fireRate * 100 + plr->lastShot - currTime; // gain suspicion for rapid firing
     else if (currTime - plr->lastShot < plr->fireRate * 180 && plr->suspicionRating > 0)
@@ -71,15 +67,28 @@ static void pcAttackNpcs(CNSocket *sock, CNPacketData *data) {
 
     plr->lastShot = currTime;
 
-    if (pkt->iNPCCnt > 3) // 3+ targets should never be possible
+    // 3+ targets should never be possible
+    if (targetCount > 3)
         plr->suspicionRating += 10000;
 
-    if (plr->suspicionRating > 10000) { // kill the socket when the player is too suspicious
+    // kill the socket when the player is too suspicious
+    if (plr->suspicionRating > 10000) {
         sock->kill();
         CNShardServer::_killConnection(sock);
-        return;
+        return true;
     }
-        
+
+    return false;
+}
+
+static void pcAttackNpcs(CNSocket *sock, CNPacketData *data) {
+    auto pkt = (sP_CL2FE_REQ_PC_ATTACK_NPCs*)data->buf;
+    Player *plr = PlayerManager::getPlayer(sock);
+    auto targets = (int32_t*)data->trailers;
+
+    // kick the player if firing too rapidly
+    if (settings::ANTICHEAT && checkRapidFire(sock, pkt->iNPCCnt))
+        return;
 
     /*
      * IMPORTANT: This validates memory safety in addition to preventing

src/settings.cpp

@@ -20,6 +20,7 @@ bool settings::LOCALHOSTWORKAROUND = true;
 time_t settings::TIMEOUT = 60000;
 int settings::VIEWDISTANCE = 25600;
 bool settings::SIMULATEMOBS = true;
+bool settings::ANTICHEAT = true;
 
 // default spawn point
 #ifndef ACADEMY
@@ -108,6 +109,7 @@ void settings::init() {
     ACCLEVEL = reader.GetInteger("shard", "accountlevel", ACCLEVEL);
     EVENTMODE = reader.GetInteger("shard", "eventmode", EVENTMODE);
     DISABLEFIRSTUSEFLAG = reader.GetBoolean("shard", "disablefirstuseflag", DISABLEFIRSTUSEFLAG);
+    ANTICHEAT = reader.GetBoolean("shard", "anticheat", ANTICHEAT);
     MONITORENABLED = reader.GetBoolean("monitor", "enabled", MONITORENABLED);
     MONITORPORT = reader.GetInteger("monitor", "port", MONITORPORT);
     MONITORINTERVAL = reader.GetInteger("monitor", "interval", MONITORINTERVAL);

src/settings.hpp

@@ -10,6 +10,7 @@ namespace settings {
     extern int SHARDPORT;
     extern std::string SHARDSERVERIP;
     extern bool LOCALHOSTWORKAROUND;
+    extern bool ANTICHEAT;
     extern time_t TIMEOUT;
     extern int VIEWDISTANCE;
     extern bool SIMULATEMOBS;

tdata

@@ -1 +1 @@
-Subproject commit 8230fb8649d6da8de71e918c24efbb55d1c08a88
+Subproject commit cc65dbb402b5baa2b604ed66132edd88cc82a52a