Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/MWHunter/Grim

Fully async, multithreaded, predictive, open source, 3.01 reach, 1.005 timer, 0.01% speed, 99.99% antikb, "bypassable" 1.8-1.20 anticheat.
https://github.com/MWHunter/Grim

Last synced: 2 months ago
JSON representation

Fully async, multithreaded, predictive, open source, 3.01 reach, 1.005 timer, 0.01% speed, 99.99% antikb, "bypassable" 1.8-1.20 anticheat.

Awesome Lists containing this project

README 

        
# GrimAC



This project is considered feature complete for the 2.0 (open-source) branch of this project. If you would like a bugfix or enhancement and cannot sponsor the work, pull requests are welcome. You can join the [discord](https://discord.com/invite/kqQAhTmkUF) for jar releases & changelogs.



GrimAC is an open source Minecraft anticheat designed for 1.21 and supports 1.8-1.21. It is free while in beta. It will eventually become paid and/or will include offering additional subscription based paid checks. Geyser players are fully exempt.



### Compiling through terminal/command prompt

1. git clone https://github.com/GrimAnticheat/Grim.git (or click the green code button, download ZIP, then unzip it.)

2. cd Grim

3. gradlew build

4. The final jar is located in build/libs



### API Information

Grim's API allows you to integrate Grim into your own plugins. For more information, check out the API's GitHub repository [here](https://github.com/GrimAnticheat/GrimAPI).



## Grim supremacy



Here are the main cores that make Grim stand out against other anticheats



### Movement Simulation Engine



* We have a 1:1 replication of the player's possible movements

* This covers everything from basic walking, swimming, knockback, cobwebs, to bubble columns

* It even covers riding entities from boats to pigs to striders

* Built upon covering edge cases to confirm accuracy

* 1.13+ clients on 1.13+ servers, 1.12- clients on 1.13+ servers, 1.13+ clients on 1.12- servers, and 1.12- clients on 1.12- servers are all supported regardless of the large technical changes between these versions.

* The order of collisions depends on the client version and is correct

* Accounts for minor bounding box differences between versions, for example:

    * Single glass panes will be a + shape for 1.7-1.8 players and * for 1.9+ players

    * 1.13+ clients on 1.8 servers see the + glass pane hitbox due to ViaVersion

    * Many other blocks have this extreme attention to detail.

    * Waterlogged blocks do not exist for 1.12 or below players

    * Blocks that do not exist in the client's version use ViaVersion's replacement block

    * Block data that cannot be translated to previous versions is replaced correctly

    * All vanilla collision boxes have been implemented



### Fully asynchronous and multithreaded design



* All movement checks and the overwhelming majority of listeners run on the netty thread

* The anticheat can scale to many hundreds of players, if not more

* Thread safety is carefully thought out

* The next core allows for this design



### Full world replication



* The anticheat keeps a replica of the world for each player

* The replica is created by listening to chunk data packets, block places, and block changes

* On all versions, chunks are compressed to 16-64 kb per chunk using palettes

* Using this cache, the anticheat can safely access the world state

* Per player, the cache allows for multithreaded design

* Sending players fake blocks with packets is safe and does not lead to falses

* The world is recreated for each player to allow lag compensation

* Client sided blocks cause no issues with packet based blocks. Block glitching does not false the anticheat.



### Latency compensation



* World changes are queued until they reach the player

* This means breaking blocks under a player does not false the anticheat

* Everything from flying status to movement speed will be latency compensated



### Inventory compensation



* The player's inventory is tracked to prevent ghost blocks at high latency, and other errors



### Secure by design, not obscurity



* All systems are designed to be highly secure and mathematically impossible to bypass

* For example, the prediction engine knows all possible movements and cannot be bypassed