add sv_maxusrcmdprocessticks_warning

rehlds/dlls/player.h

@@ -322,6 +322,31 @@ class CBasePlayer : public CBaseMonster
 
 	float m_flNextChatTime;
 
+	float GetRemainingMovementTimeForUserCmdProcessing() const { return m_flMovementTimeForUserCmdProcessingRemaining; }
+	float ConsumeMovementTimeForUserCmdProcessing( float flTimeNeeded )
+	{
+		if ( m_flMovementTimeForUserCmdProcessingRemaining <= 0.0f )
+			return 0.0f;
+
+		const float DIST_EPSILON = 0.03125f;
+		else if ( flTimeNeeded > m_flMovementTimeForUserCmdProcessingRemaining + FLT_EPSILON )
+		{
+			float flResult = m_flMovementTimeForUserCmdProcessingRemaining;
+			m_flMovementTimeForUserCmdProcessingRemaining = 0.0f;
+			return flResult;
+		}
+		else
+		{
+			m_flMovementTimeForUserCmdProcessingRemaining -= flTimeNeeded;
+			if ( m_flMovementTimeForUserCmdProcessingRemaining < 0.0f )
+				m_flMovementTimeForUserCmdProcessingRemaining = 0.0f;
+			return flTimeNeeded;
+		}
+	}
+
+private:
+	// How much of a movement time buffer can we process from this user?
+	float m_flMovementTimeForUserCmdProcessingRemaining;
 };
 
 #define AUTOAIM_2DEGREES  0.0348994967025

rehlds/engine/server.h

@@ -378,6 +378,7 @@ extern cvar_t sv_rehlds_attachedentities_playeranimationspeed_fix;
 extern cvar_t sv_rehlds_local_gametime;
 extern cvar_t sv_rehlds_send_mapcycle;
 extern cvar_t sv_usercmd_custom_random_seed;
+extern cvar_t sv_maxusrcmdprocessticks_warning;
 #endif
 extern int sv_playermodel;
 

rehlds/engine/sv_main.cpp

@@ -210,6 +210,7 @@ cvar_t sv_rehlds_send_mapcycle = { "sv_rehlds_send_mapcycle", "0", 0, 0.0f, null
 cvar_t sv_rehlds_maxclients_from_single_ip = { "sv_rehlds_maxclients_from_single_ip", "5", 0, 5.0f, nullptr };
 cvar_t sv_use_entity_file = { "sv_use_entity_file", "0", 0, 0.0f, nullptr };
 cvar_t sv_usercmd_custom_random_seed = { "sv_usercmd_custom_random_seed", "0", 0, 0.0f, nullptr };
+cvar_t sv_maxusrcmdprocessticks_warning = { "sv_maxusrcmdprocessticks_warning", "0", 0, 0.0f, nullptr };
 #endif
 
 delta_t *SV_LookupDelta(char *name)
@@ -8025,6 +8026,7 @@ void SV_Init(void)
 	Cvar_RegisterVariable(&sv_rollangle);
 	Cvar_RegisterVariable(&sv_use_entity_file);
 	Cvar_RegisterVariable(&sv_usercmd_custom_random_seed);
+	Cvar_RegisterVariable(&sv_maxusrcmdprocessticks_warning);
 #endif
 
 	for (int i = 0; i < MAX_MODELS; i++)

rehlds/engine/sv_user.cpp

@@ -754,6 +754,27 @@ void SV_ForceFullClientsUpdate(void)
 
 void SV_RunCmd(usercmd_t *ucmd, int random_seed)
 {
+	const float playerFrameTime = (1.0f / sys_ticrate.value);
+	const float flTimeAllowedForProcessing = host_client->ConsumeMovementTimeForUserCmdProcessing( playerFrameTime );
+	bool isBot = host_client->fakeclient;
+	if ( !isBot && ( flTimeAllowedForProcessing < playerFrameTime ) )
+	{
+		// Make sure that the activity in command is erased because player cheated or dropped too many packets
+		double dblWarningFrequencyThrottle = sv_maxusrcmdprocessticks_warning.value;
+		if ( dblWarningFrequencyThrottle >= 0.0 )
+		{
+			static double s_dblLastWarningTime = 0.0;
+			double dblTimeNow = Sys_FloatTime();
+			if ( !s_dblLastWarningTime || ( dblTimeNow - s_dblLastWarningTime >= dblWarningFrequencyThrottle ) )
+			{
+				s_dblLastWarningTime = dblTimeNow;
+				Con_Printf( "sv_maxusrcmdprocessticks_warning at server tick %u: Ignored client %s usrcmd (%.6f < %.6f)!\n",
+					m_system->GetTick(), host_client->name, flTimeAllowedForProcessing, playerFrameTime );
+			}
+		}
+		return; // Don't process this command
+	}
+
 	usercmd_t cmd = *ucmd;
 	int i;
 	edict_t *ent;