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getting forge players modlist on a non forge server using a fake forge handshake


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Hey everybody!

I am the developer of a spigot plugin which allows to detect forge mods of a player. This is very useful because it allows to see when a player uses banned mods (like wurst forge for example). In order to do that I have to send a special packet (known as plugin message or PacketPkayOutCustomPayload) consisting of a String (the name of the channel) and a byte[] (the data contained in the message). Unfortunately since 1.13 this packet has changed and the channel is no longer a simple String but a MinecraftKey. This is not necessarily a problem because a MinecraftKey can be initialized from a String matching a certain regex ([^ a-z0-9 /_.-]+), the old channel being "FML|HS", the new theoretically would have been "fml:hs" or "fml:handshake", however neither of them works and I can not find any additional information on wiki.vg.

If anyone can help me I would be very grateful to him, Thomas!

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On 5/19/2019 at 9:00 PM, diesieben07 said:

The mod list cannot be relied upon and you should not try to trick the client into thinking it's connected to a Forge server.

I know that this isn't perfect but it allowed me to find a lot of cheaters so it's a really nice feature. What's the problem with faking forge handshake?

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  • 2 weeks later...

Well, there's still the problem that a banned mod need not report itself to the "Forge" server.



The client is a lying, cheating bastard. Never, ever trust the client.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.


Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.


DO NOT PM ME WITH PROBLEMS. No help will be given.

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