Disclaimer: This is not needed for e4mc 5.4.0+ as they implemented a whitelist there

LANLock

A few days ago, I stumbled across LANGuard, a mod that achieves the same thing as this one and also contributed to it. As this was my first ever contact with Java and Minecraft Mod Development, I started to work on a new PR but soon noticed that I'm basically rewriting the entire mod. So I thought, it would be better if I just start a fully own mod that uses a different approach to enforce the whitelist. And here we are :)

Also a thanks to Ovilli for creating their mod that is the start of this one.

Reason for this mod

More and more players are using mods like e4mc to make their LAN worlds publicly available. But griefers have noticed this too and as LAN worlds provide no tooling to prevent anyone from joining, this starts to become a risk (see this video). With this mod I tried to recreate the Minecraft Server whitelist system as closely as possible (with my non-existent Java knowledge).

Features

• a whitelist similar to the server counterpart
  • stores name and UUID
  • UUID is used to check if connecting player is on the whitelist
• config screen made with Cloth Config in modmenu for easy configuration
  • automatically resolves UUID for added player names asynchronously
  • option to disable the whitelist entirely
  • option to use names instead of UUIDs for checking (for testing)
• same options accessible via the client side command /lanlock

Technical

Other than LANGuard, LANLock doesn't even allow non whitelisted players to join the server by modifying the connection process with a mixin. So this and the usage of UUIDs differentiate this mod from LANGuard and at least from my understanding of programming should make it more secure.

License

MIT