Anti-cheat guide

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AC (anti cheat) guide

Server setup

3 settings in mtaserver.conf control AC behaviour for a server:

<disableac></disableac>

Comma separated list of disabled anti-cheats. This setting disables specific AC codes. AC codes are shown to the player when that detection has been triggered. Available codes are:

Code for <disableac> Displayed on detect Required server version Required <minclientversion> Notes
1 AC #1 any Classic health/armour hack detector
4 AC #4 any Detects presence of trainer. Capital letters in the message are for tagging particular trainers
5 AC #5 any Detects use of trainer.
6 VF #6 any Detects use of trainer incl.: player movement, health/damage, weapons, money, gamespeed, game cheats, aimbot
7 VF #7 any Detects use of trainer.
8 VF #8 any Detects unauthorized mods
11 AC #11 any More trainers
VF #11 any Dll injector / Trainer
13 SD #13 any Data files issue
17 VF #17 any Speed / wall hacks
21 AC #21 any 1.3.1-9.05097 More trainers
VF #21 any 1.3.1-9.05097 Custom gta_sa.exe
26 SD #26 any 1.3.4-9.05858 Anti-cheat component blocked
31 SD #31 any gta3.img player skin mods (1.4 only. For 1.5, use allow_gta3_img_mods)


<enablesd></enablesd>

Comma separated list of enabled special detections. A special detection is a type of anti-cheat for (usually) harmless game modifications. Competitive servers may wish to enable special detections, but most servers should leave this setting blank. Available codes are:

Code for <enablesd> Displayed on detect Required server version Required <minclientversion> Notes
12 SD #12 any Disallow custom D3D9.DLL
14 SD #14 1.3.1-9.04605 1.3.1-9.04605 Disallow virtual machines such as VMWare
15 SD #15 1.3.1-9.04791 1.3.1-9.04791 Disallow disabled driver signing
16 SD #16 1.3.1-9.05097 1.3.1-9.05097 Disallow disabled anti-cheat components. This is triggered when an anti-cheat component can not start. It is usually due to some problem with the PC and might be fixed by a reboot. Can also be triggered by a virus.
20 SD #20 1.3.1-9.05097 1.3.1-9.05097 Disallow non-standard gta3.img (For servers not using onPlayerModInfo)
22 SD #22 1.3.4-9.05884 1.3.4-9.05884 Disallow resource download errors/corruption (Lua script files)
23 SD #23 1.3.4-9.05884 Disallow resource download errors/corruption (Non-Lua files e.g. png,dff)
28 SD #28 1.3.4-9.05884 1.3.4-9.05884 Disallow Linux Wine


<client_file name="data/carmods.dat" verify="0"/>

By default, clients may not join a server if they have customized GTA:SA data files. Adding one or more of the above lines excludes files from validation. The file names that can be used are:

  • "data/carmods.dat"
  • "data/animgrp.dat"
  • "data/ar_stats.dat"
  • "data/melee.dat"
  • "data/clothes.dat"
  • "data/object.dat"
  • "data/default.dat"
  • "data/surface.dat"
  • "data/default.ide"
  • "data/gta.dat"
  • "data/surfinfo.dat"
  • "data/peds.ide"
  • "data/vehicles.ide"
  • "data/pedstats.dat"
  • "data/water.dat"
  • "data/txdcut.ide"
  • "data/water1.dat"
  • "models/coll/weapons.col"
  • "data/weapon.dat"
  • "data/plants.dat"
  • "anim/ped.ifp"
  • "data/furnitur.dat"
  • "data/procobj.dat"
  • "data/maps"


Note 1: "data/maps" represents all the files and directories within "data/maps"

Note 2: "data/handling.cfg" is not included as it is always ignored by MTA because of the internal vehicle handling functions. See here if you want to load custom handling.cfg files


Client

When joining a server, the server AC info is displayed in the client console (F8)
Example:

   Server AC Info: [Allowed client files: None] [Disabled AC: None] [Enabled SD: None]

Disabled AC contains the contents of the server setting from <disableac></disableac>
Enabled SD contains the contents of the server setting from <enablesd></enablesd>
Allowed client files contains numbers to indicate which client files the server allows to be modified. The numbers represent these files:

  • 1 - "data/carmods.dat"
  • 2 - "data/animgrp.dat"
  • 4 - "data/ar_stats.dat"
  • 5 - "data/melee.dat"
  • 6 - "data/clothes.dat"
  • 7 - "data/object.dat"
  • 8 - "data/default.dat"
  • 9 - "data/surface.dat"
  • 10 - "data/default.ide"
  • 12 - "data/gta.dat"
  • 13 - "data/surfinfo.dat"
  • 14 - "data/peds.ide"
  • 15 - "data/vehicles.ide"
  • 16 - "data/pedstats.dat"
  • 17 - "data/water.dat"
  • 18 - "data/txdcut.ide"
  • 19 - "data/water1.dat"
  • 20 - "models/coll/weapons.col"
  • 21 - "data/weapon.dat"
  • 22 - "data/plants.dat"
  • 23 - "anim/ped.ifp"
  • 24 - "data/furnitur.dat"
  • 25 - "data/procobj.dat"
  • 26 - "data/maps"


Using modified files

If you want to use modified data files from your GTA:SA install directory, check this check box:

   Settings->Multiplayer->Use customized GTA:SA files

(check box only appears if your GTA:SA data files are customized)

Note that this will restrict your access to public servers as most do not allow customized data files.


AC Panel resource

An anti-cheat helper resource called acpanel is included with the default resources.

It shows the current anti-cheat status of your server, along with an option to keep your clients up to date and a basic implementation of onPlayerModInfo to block modified img files.

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