sfcnr/pawno/include/anticheat/hitpoints.inc

/*
	PROJECT		<>	SA:MP Anticheat Plug-in
	LICENSE		<>	See LICENSE in the top level directory.
	AUTHOR(S)	<>	Lorenc_ (zeelorenc@hotmail.com)
	PURPOSE		<>  Providing datastructures for the internal SA:MP Server.


	Copyright (C) 2014 SA:MP Anticheat Plug-in.

	The Project is available on https://github.com/myudev/SAMPAC

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License along
	with this program; if not, see <http://www.gnu.org/licenses/>.
*/

/* ** Includes ** */
#include 							< YSI\y_hooks >

/* ** Variables ** */
static stock
	Float: p_PlayerHealth 			[ MAX_PLAYERS ] [ E_PLAYER_HITPOINTS ],
	Float: p_PlayerArmour 			[ MAX_PLAYERS ] [ E_PLAYER_HITPOINTS ],
	Float: p_LastDamageIssued		[ MAX_PLAYERS ],
	p_LastTookDamage 				[ MAX_PLAYERS ],
	p_LastDamageIssuer 				[ MAX_PLAYERS ] = { INVALID_PLAYER_ID, ... },
	p_LastWeaponIssuer 				[ MAX_PLAYERS ]
;

/* ** Forwards ** */
forward OnPlayerDamagePlayer 		( playerid, damagedid, Float: amount, weaponid, bodypart );
forward OnPlayerTakePlayerDamage 	( playerid, issuerid, &Float: amount, weaponid, bodypart );
forward OnPlayerDeathEx 			( playerid, killerid, reason, Float: damage, bodypart );

// Function (AC_UpdateKillerData)

stock AC_UpdateDamageInformation( playerid, attackerid, weaponid )
{
	p_LastTookDamage[ playerid ] = GetTickCount( );
	p_LastDamageIssuer[ playerid ] = attackerid;
	p_LastWeaponIssuer[ playerid ] = weaponid;
}

// Function (AC_GetPlayerHealth)

stock Float: AC_GetPlayerHealth( playerid )
	return p_PlayerHealth[ playerid ] [ E_POINTS ];

// Function (AddPlayerHealth)

stock AC_AddPlayerHealth( playerid, Float:amount )
{
	p_PlayerHealth[ playerid ] [ E_POINTS ] += amount;
	p_PlayerHealth[ playerid ] [ E_SYNCED ] = false;

    return SetPlayerHealth( playerid, p_PlayerHealth[ playerid ] [ E_POINTS ] );
}

// Function Hook (SetPlayerHealth)

stock AC_SetPlayerHealth( playerid, Float:amount )
{
	p_PlayerHealth[ playerid ] [ E_POINTS ] = amount;
	p_PlayerHealth[ playerid ] [ E_SYNCED ] = false;

	if( amount <= 0.0 && p_acSpawned{ playerid } )
	{
		if( ( GetTickCount( ) - p_LastTookDamage[ playerid ] ) > 2500 ) {
			p_LastDamageIssuer[ playerid ] = INVALID_PLAYER_ID, p_LastWeaponIssuer[ playerid ] = 47;
		}

		p_acSpawned{ playerid } = false; // They're dead!
		CallRemoteFunction( "OnPlayerDeathEx", "ddfd", playerid, p_LastDamageIssuer[ playerid ], p_LastWeaponIssuer[ playerid ], 3.3, 3 );
	}
    return SetPlayerHealth( playerid, amount );
}

#if defined _ALS_SetPlayerHealth
    #undef SetPlayerHealth
#else
    #define _ALS_SetPlayerHealth
#endif
#define SetPlayerHealth AC_SetPlayerHealth

// Function Hook (SetPlayerArmour)

stock AC_SetPlayerArmour( playerid, Float:amount )
{
	p_PlayerArmour[ playerid ] [ E_POINTS ] = amount;
	p_PlayerArmour[ playerid ] [ E_SYNCED ] = false;
    return SetPlayerArmour( playerid, amount );
}

#if defined _ALS_SetPlayerArmour
    #undef SetPlayerArmour
#else
    #define _ALS_SetPlayerArmour
#endif
#define SetPlayerArmour AC_SetPlayerArmour

// Function Hook (SetPlayerTeam)

stock AC_SetPlayerTeam( playerid, teamid )
{
	if( teamid != AC_DEFAULT_TEAM ) {
		printf("[ACWarning] You cannot use SetPlayerTeam as you have hitpoint hack detection enabled (teamid %d, default %d).", teamid, AC_DEFAULT_TEAM );
	}
    return SetPlayerTeam( playerid, AC_DEFAULT_TEAM );
}

#if defined _ALS_SetPlayerTeam
    #undef SetPlayerTeam
#else
    #define _ALS_SetPlayerArmour
#endif
#define SetPlayerTeam AC_SetPlayerTeam

/* ** Callback Hooks ** */
hook OnPlayerConnect( playerid )
{
	if ( 0 <= playerid < MAX_PLAYERS )
	{
		p_PlayerHealth[ playerid ] [ E_UPDATE_FAIL ] = 0;
		p_PlayerArmour[ playerid ] [ E_UPDATE_FAIL ] = 0;
	}
	return 1;
}

hook OnPlayerSpawn( playerid )
{
	// Health/Armour Hack
	p_PlayerHealth[ playerid ] [ E_UPDATE_FAIL ] = 0;
	p_PlayerHealth[ playerid ] [ E_POINTS ] = 100.0;

	p_PlayerArmour[ playerid ] [ E_UPDATE_FAIL ] = 0;
	p_PlayerArmour[ playerid ] [ E_POINTS ] = 0.0;

	SetPlayerTeam( playerid, AC_DEFAULT_TEAM ); // Set everyone the same team
	return 1;
}

hook OnPlayerTakeDamage( playerid, issuerid, Float: amount, weaponid, bodypart )
{
	new
		is_npc = IsPlayerNPC( issuerid );

	p_LastTookDamage[ playerid ] = GetTickCount( );
	p_LastDamageIssuer[ playerid ] = issuerid;
	p_LastWeaponIssuer[ playerid ] = weaponid;
	p_LastDamageIssued[ playerid ] = amount;

	//if( !( issuerid != INVALID_PLAYER_ID && IsPlayerInAnyVehicle( issuerid ) && GetPlayerVehicleSeat( issuerid ) == 0 && ( weaponid == WEAPON_M4 || weaponid == WEAPON_MINIGUN ) ) )
	//	return 0;

	// Allow hunter damage/sparrow
	if( !( issuerid != INVALID_PLAYER_ID && IsPlayerInAnyVehicle( issuerid ) && GetPlayerVehicleSeat( issuerid ) == 0 && ( weaponid == WEAPON_M4 || weaponid == WEAPON_MINIGUN ) ) && !is_npc )
	{
		// Ignore unreliable and invalid damage
		if( weaponid < 0 || weaponid >= sizeof( s_ValidDamageGiven ) || s_ValidDamageGiven[ weaponid ] )
			return 0;
	}

	if( ac_IsPlayerSpawned( playerid ) )
	{
		if( issuerid != INVALID_PLAYER_ID && ! is_npc )
		{
			if( OnPlayerTakePlayerDamage( playerid, issuerid, amount, weaponid, bodypart ) )
			{
				new Float: tmp, Float: tmp_amount = amount;

				if( p_PlayerArmour[ playerid ] [ E_POINTS ] )
				{
					if( ( tmp = p_PlayerArmour[ playerid ] [ E_POINTS ] - tmp_amount ) < 0.0 )  {
						tmp_amount -= p_PlayerArmour[ playerid ] [ E_POINTS ];
						p_PlayerArmour[ playerid ] [ E_POINTS ] = 0.0;
					} else  {
						p_PlayerArmour[ playerid ] [ E_POINTS ] = tmp;
						tmp_amount = 0.0;
					}
				}

				if( ( p_PlayerHealth[ playerid ] [ E_POINTS ] -= tmp_amount ) < 0.0 ) {
					p_acSpawned{ playerid } = false; // They're dead!
					CallRemoteFunction( "OnPlayerDeathEx", "ddfd", playerid, issuerid, weaponid, amount, bodypart );
				}

				SetPlayerArmour( playerid, p_PlayerArmour[ playerid ] [ E_POINTS ] );
				SetPlayerHealth( playerid, p_PlayerHealth[ playerid ] [ E_POINTS ] );

				CallRemoteFunction( "OnPlayerDamagePlayer", "ddfdd", issuerid, playerid, amount, weaponid, bodypart );
			}
		}
		else
		{
			new Float: tmp, Float: tmp_amount = amount;

			if( !( weaponid == 53 || weaponid == 54 || weaponid == 50 ) && p_PlayerArmour[ playerid ] [ E_POINTS ] )
			{
				if( ( tmp = p_PlayerArmour[ playerid ] [ E_POINTS ] - tmp_amount ) < 0.0 )  {
					tmp_amount -= p_PlayerArmour[ playerid ] [ E_POINTS ];
					p_PlayerArmour[ playerid ] [ E_POINTS ] = 0.0;
				} else  {
					p_PlayerArmour[ playerid ] [ E_POINTS ] = tmp;
					tmp_amount = 0.0;
				}
			}

			// printf("OnPlayerTakeDamage( %d, %d, %f, %d, %d ) %f", playerid, issuerid, amount, weaponid, bodypart, p_PlayerHealth[ playerid ] [ E_POINTS ] );
			if( ( p_PlayerHealth[ playerid ] [ E_POINTS ] -= tmp_amount ) <= ( weaponid == 37 ? 0.99999 : 0.0 ) ) {
				// find any possible killers prior
				if( ( GetTickCount( ) - p_LastTookDamage[ playerid ] ) > 2500 ) {
					p_LastDamageIssuer[ playerid ] = issuerid, p_LastWeaponIssuer[ playerid ] = weaponid;
				}
				p_acSpawned{ playerid } = false; // They're dead!
				if ( weaponid == 37 || weaponid == 51 ) SetPlayerHealth( playerid, -1 ); // Death bug fix
				CallRemoteFunction( "OnPlayerDeathEx", "ddfd", playerid, p_LastDamageIssuer[ playerid ], p_LastWeaponIssuer[ playerid ], amount, bodypart );
			}
		}
	}
	return 1;
}

hook OnPlayerGiveDamage( playerid, damagedid, Float: amount, weaponid, bodypart )
{
	// Ignore unreliable and invalid damage
	if ( weaponid < 0 || weaponid >= sizeof( s_ValidDamageGiven ) || !s_ValidDamageGiven[ weaponid ] )
		return 0;

	if( weaponid < 0 || weaponid >= sizeof( s_ValidMaxDamage ) || amount > s_ValidMaxDamage[ weaponid ] + 2.0 ) // 2.0 safety margin
		return 0;

	if( damagedid == INVALID_PLAYER_ID )
		return 0;

	if( IsPlayerInAnyVehicle( playerid ) && GetPlayerVehicleSeat( playerid ) == 0 && ( weaponid == WEAPON_M4 || weaponid == WEAPON_MINIGUN ) )
		return 0;

	if ( !IsPlayerNPC( damagedid ) )
	{
		if( !ac_IsPlayerSpawned( damagedid ) )
			return 0;

		if( ( !IsPlayerStreamedIn( playerid, damagedid ) && !( GetTickCount( ) - p_acUpdateTime[ damagedid ] >= 2595 ) ) || !IsPlayerStreamedIn( damagedid, playerid ) )
			return 0;

		//printf("OnPlayerGiveDamage( %d, %d, %f, %d, %d )", playerid, damagedid, amount, weaponid, bodypart );
		//p_LastTookDamage[ damagedid ] = GetTickCount( );
		//p_LastDamageIssuer[ damagedid ] = playerid;
		//p_LastWeaponIssuer[ damagedid ] = weaponid;
		//p_LastDamageIssued[ damagedid ] = amount;

		if( OnPlayerTakePlayerDamage( damagedid, playerid, amount, weaponid, bodypart ) )
		{
			new
				Float: tmp,
				Float: distance = ac_GetDistanceBetweenPlayers( playerid, damagedid ), // Calc distance between players
				Float: tmp_amount = amount // this amount is extremely unreliable
			;
			//printf("Proposed dmg %f kinda %f (min: %f, max: %f, rng: %f)", amount, tmp_amount, GetWeaponMinRange( weaponid ), GetWeaponMaxRange( weaponid ), distance );

			if( distance > s_WeaponRange[ weaponid ] + 2.0 )
				return 0; //printf(" INVALID RANGE %f (MAX %f)", distance, GetWeaponMaxRange( weaponid ) ), 0;

			if( p_PlayerArmour[ damagedid ] [ E_POINTS ] )
			{
				if( ( tmp = p_PlayerArmour[ damagedid ] [ E_POINTS ] - tmp_amount ) < 0.0 )  {
					tmp_amount -= p_PlayerArmour[ damagedid ] [ E_POINTS ];
					p_PlayerArmour[ damagedid ] [ E_POINTS ] = 0.0;
				} else  {
					p_PlayerArmour[ damagedid ] [ E_POINTS ] = tmp;
					tmp_amount = 0.0;
				}
			}

			if( ( p_PlayerHealth[ damagedid ] [ E_POINTS ] -= tmp_amount ) < 0.0 ) {
				p_acSpawned{ damagedid } = false; // They're dead!
				CallRemoteFunction( "OnPlayerDeathEx", "ddfd", damagedid, playerid, weaponid, amount, bodypart );
			}

			SetPlayerArmour( damagedid, p_PlayerArmour[ damagedid ] [ E_POINTS ] );
			SetPlayerHealth( damagedid, p_PlayerHealth[ damagedid ] [ E_POINTS ] );

			CallRemoteFunction( "OnPlayerDamagePlayer", "ddfdd", playerid, damagedid, amount, weaponid, bodypart );
		}
	}
	return 1;
}

// Functions (Player)
stock vCheckForHealthHacks( playerid, iTicks )
{
	new
		Float: currentHealth,
		Float: currentArmour
	;
	GetPlayerHealth( playerid, currentHealth );
	GetPlayerArmour( playerid, currentArmour );

	// Lag Calculations
	new
		Float: fHitDamage = p_LastDamageIssued[ playerid ],
		Float: fArmourDamage,
		Float: fHealthDamage
	;

	if( fHitDamage > currentArmour ) {
		fArmourDamage = currentArmour;
		fHealthDamage = fHitDamage - currentArmour;
	}
	else fArmourDamage = fHitDamage;

	// Begin Health Hack Detection
	if( iTicks > p_PlayerHealth[ playerid ] [ E_UPDATE_TIME ] )
	{
		new currentHealthInt 	= floatround( currentHealth, floatround_floor );
		new healthShouldBeInt 	= floatround( p_PlayerHealth[ playerid ] [ E_POINTS ], floatround_floor );

		if( currentHealthInt == healthShouldBeInt )
			p_PlayerHealth[ playerid ] [ E_SYNCED ] = true;

		if( !p_PlayerHealth[ playerid ] [ E_SYNCED ] )
		{
			if( currentHealthInt > healthShouldBeInt )
			{
				switch( p_PlayerHealth[ playerid ] [ E_UPDATE_FAIL ]++ )
				{
					case 0 .. 9: SetPlayerHealth( playerid, p_PlayerHealth[ playerid ] [ E_POINTS ] );
					case 10: SendClientMessage( playerid, 0xa9c4e4ff, "You have been kicked as you are desynced from the server. Please relog!" ), KickPlayerTimed( playerid ), printf("[health] Player %d was desynced thus kicked.", playerid);
				}
			}
		}
		else
		{
			p_PlayerHealth[ playerid ] [ E_UPDATE_FAIL ] = 0;

			if( healthShouldBeInt > currentHealthInt )
				p_PlayerHealth[ playerid ] [ E_POINTS ] = currentHealth;

			if( currentHealthInt > healthShouldBeInt && currentHealthInt <= 255 && currentHealthInt > 0 )
            	SetPlayerHealth( playerid, p_PlayerHealth[ playerid ] [ E_POINTS ] );

			currentHealthInt = floatround( currentHealth, floatround_floor );
			healthShouldBeInt = floatround( p_PlayerHealth[ playerid ] [ E_POINTS ], floatround_floor );

			new dmgOne = floatround( currentHealthInt - fHealthDamage, floatround_floor );
			new dmgTwo = floatround( currentHealthInt - fHealthDamage, floatround_ceil );

            if( !( currentHealthInt == healthShouldBeInt || dmgOne == healthShouldBeInt || dmgTwo == healthShouldBeInt ) )
            {
            	SetPlayerHealth( playerid, p_PlayerHealth[ playerid ] [ E_POINTS ] );
				//printf("[health][%d] %d seems to health hack (server health: %d and client health: %d, health dmg: %f, armour dmg: %f).", playerid, playerid, healthShouldBeInt, currentHealthInt, fHealthDamage, fArmourDamage );
            }
		}
		p_PlayerHealth[ playerid ] [ E_UPDATE_TIME ] = iTicks + 1000;
	}

	// Begin Armour Hack Detection
	if( iTicks > p_PlayerArmour[ playerid ] [ E_UPDATE_TIME ] )
	{
		new currentArmourInt 	= floatround( currentArmour, floatround_floor );
		new ArmourShouldBeInt 	= floatround( p_PlayerArmour[ playerid ] [ E_POINTS ], floatround_floor );

		if( currentArmourInt == ArmourShouldBeInt )
			p_PlayerArmour[ playerid ] [ E_SYNCED ] = true;

		if( !p_PlayerArmour[ playerid ] [ E_SYNCED ] )
		{
			if( currentArmourInt > ArmourShouldBeInt )
			{
				switch( p_PlayerArmour[ playerid ] [ E_UPDATE_FAIL ]++ )
				{
					case 0 .. 9: SetPlayerArmour( playerid, p_PlayerArmour[ playerid ] [ E_POINTS ] );
					case 10: SendClientMessage( playerid, 0xa9c4e4ff, "You have been kicked as you are desynced from the server. Please relog!" ), KickPlayerTimed( playerid ), printf("[armour] Player %d was desynced thus kicked.", playerid);
				}
			}
		}
		else
		{
			p_PlayerArmour[ playerid ] [ E_UPDATE_FAIL ] = 0;

			if( ArmourShouldBeInt > currentArmourInt )
				p_PlayerArmour[ playerid ] [ E_POINTS ] = currentArmour;

			if( currentArmourInt > ArmourShouldBeInt && currentArmourInt <= 255 && currentArmourInt > 0 )
            	SetPlayerArmour( playerid, p_PlayerArmour[ playerid ] [ E_POINTS ] );

			currentArmourInt = floatround( currentArmour, floatround_floor );
			ArmourShouldBeInt = floatround( p_PlayerArmour[ playerid ] [ E_POINTS ], floatround_floor );

			new dmgOne = floatround( currentArmourInt - fArmourDamage, floatround_floor );
			new dmgTwo = floatround( currentArmourInt - fArmourDamage, floatround_ceil );

            if( !( currentArmourInt == ArmourShouldBeInt || dmgOne == ArmourShouldBeInt || dmgTwo == ArmourShouldBeInt ) )
            {
            	SetPlayerArmour( playerid, p_PlayerArmour[ playerid ] [ E_POINTS ] );
				//printf("[armour] %d seems to armour hack (server armour: %d and client armour: %d, health dmg: %f, armour dmg: %f).", playerid, ArmourShouldBeInt, currentArmourInt, fHealthDamage, fArmourDamage );
            }
		}
		p_PlayerArmour[ playerid ] [ E_UPDATE_TIME ] = iTicks + 1000;
	}
}

hook OnPlayerDeath(playerid, killerid, reason)
{
	if ( !IsPlayerNPC( playerid ) )
	{
	    // Died in Vehicle
		if ( GetPlayerVehicleID( playerid ) && ac_IsPlayerSpawned( playerid ) )
	    {
			if( ( GetTickCount( ) - p_LastTookDamage[ playerid ] ) > 2500 )
				p_LastDamageIssuer[ playerid ] = INVALID_PLAYER_ID, p_LastWeaponIssuer[ playerid ] = 51;

			p_acSpawned{ playerid } = false; // They're dead!
			CallRemoteFunction( "OnPlayerDeathEx", "ddfd", playerid, p_LastDamageIssuer[ playerid ], p_LastWeaponIssuer[ playerid ], 3.3, 3 );
	    }

		// General
    	p_acSpawned{ playerid } = false;

    	// Weapon Hack
		p_PlayerWeaponUpdateTime[ playerid ] = GetTickCount( ) + 2000;

		// Airbrake
        p_abLastTick[ playerid ] = GetTickCount( ) + 3000;
   	}
	return 1;
}

/* ** Functions ** */
stock ForcePlayerKill( playerid, killerid, weaponid )
{
	p_LastTookDamage[ playerid ] = GetTickCount( );
	p_LastDamageIssuer[ playerid ] = killerid;
	p_LastWeaponIssuer[ playerid ] = weaponid;
	p_LastDamageIssued[ playerid ] = 100.0;

	SetPlayerHealth( playerid, -1 );
}