backport antiFakePlayer to game module once again

Author: Razish

codemp/game/g_client.c

@@ -2396,13 +2396,14 @@ restarts.
 ============
 */
 
-static qboolean CompareIPs( const char *ip1, const char *ip2 )
-{
-	while ( 1 ) {
-		if ( *ip1 != *ip2 )
+static qboolean CompareIPs(const char *ip1, const char *ip2) {
+	while (1) {
+		if (*ip1 != *ip2) {
 			return qfalse;
-		if ( !*ip1 || *ip1 == ':' )
+		}
+		if (!*ip1 || *ip1 == ':') {
 			break;
+		}
 		ip1++;
 		ip2++;
 	}
@@ -2451,6 +2452,20 @@ char *ClientConnect( int clientNum, qboolean firstTime, qboolean isBot ) {
 		}
 	}
 
+	// check for >= g_maxConnPerIP connections from same IP
+	if (g_antiFakePlayer.integer && !isBot && firstTime) {
+		int count = 0, i = 0;
+		gclient_t *cl;
+		for (i = 0, cl = level.clients; i < sv_maxclients.integer; i++, cl++) {
+			if (cl->pers.connected >= CON_CONNECTING && CompareIPs(tmpIP, cl->sess.IP)) {
+				count++;
+			}
+		}
+		if (count >= g_maxConnPerIP.integer) {
+			return "Too many connections from the same IP";
+		}
+	}
+
 	if ( ent->inuse )
 	{// if a player reconnects quickly after a disconnect, the client disconnect may never be called, thus flag can get lost in the ether
 		G_LogPrintf( "Forcing disconnect on active client: %i\n", clientNum );

codemp/game/g_xcvar.h

@@ -72,6 +72,7 @@ XCVAR_DEF( g_allowHighPingDuelist,		"1",			NULL,				CVAR_NONE,										qtrue )
 XCVAR_DEF( g_allowNPC,					"1",			NULL,				CVAR_CHEAT,										qtrue )
 XCVAR_DEF( g_allowTeamVote,				"1",			NULL,				CVAR_ARCHIVE,									qfalse )
 XCVAR_DEF( g_allowVote,					"-1",			NULL,				CVAR_ARCHIVE,									qfalse )
+XCVAR_DEF( g_antiFakePlayer,			"0",			NULL,				CVAR_ARCHIVE,									qfalse )
 XCVAR_DEF( g_armBreakage,				"0",			NULL,				CVAR_NONE,										qtrue )
 XCVAR_DEF( g_austrian,					"0",			NULL,				CVAR_ARCHIVE,									qfalse )
 XCVAR_DEF( g_autoMapCycle,				"0",			NULL,				CVAR_ARCHIVE|CVAR_NORESTART,					qtrue )
@@ -111,6 +112,7 @@ XCVAR_DEF( g_locationBasedDamage,		"1",			NULL,				CVAR_NONE,										qtrue )
 XCVAR_DEF( g_log,						"games.log",	NULL,				CVAR_ARCHIVE,									qfalse )
 XCVAR_DEF( g_logClientInfo,				"0",			NULL,				CVAR_ARCHIVE,									qtrue )
 XCVAR_DEF( g_logSync,					"0",			NULL,				CVAR_ARCHIVE,									qfalse )
+XCVAR_DEF( g_maxConnPerIP,				"3",			NULL,				CVAR_ARCHIVE,									qfalse )
 XCVAR_DEF( g_maxForceRank,				"7",			NULL,				CVAR_SERVERINFO|CVAR_ARCHIVE|CVAR_LATCH,		qfalse )
 XCVAR_DEF( g_maxGameClients,			"0",			NULL,				CVAR_SERVERINFO|CVAR_LATCH|CVAR_ARCHIVE,		qfalse )
 XCVAR_DEF( g_maxHolocronCarry,			"3",			NULL,				CVAR_LATCH,										qfalse )

codemp/server/sv_client.cpp

@@ -316,8 +316,8 @@ void SV_DirectConnect( netadr_t from ) {
 	// save the userinfo
 	Q_strncpyz( newcl->userinfo, userinfo, sizeof(newcl->userinfo) );
 
+	// check for >= sv_maxConnPerIP connections from same IP
 	if (sv_antiFakePlayer->integer) {
-		// check for > sv_maxConnPerIP connections from same IP
 		int count = 0, i = 0;
 		for (i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++) {
 			if (cl->state >= CS_CONNECTED && NET_CompareBaseAdr(svs.clients[clientNum].netchan.remoteAddress, svs.clients[i].netchan.remoteAddress)) {