You can prevent this by evaluating the client-movement
on the server, and snapping back the client
(or making him inactive)
This is quite complex though, to get it properly working.
(and would require to let the client send
all data that was used to change and calculate the
movement, the server reuses this to determine
if it was a valid action)


You could also do a simple function to
see if a client sends positions, that would
in reality intersect with the walls/floors.

In an indy game, a client-kick + ip ban should be enough

i guess just checking integrity of files is alo easier, like check map's md5 hash, if it doesnt match with the one on server, you cannot join.

This assumes, that the client would respond with the
wrong checksum. (wich can also be hacked to always
send the correct one)

A hacker can simply alter the send positiondata, when
the server does not evaluate client movement.

The only totally save way is to do everything on the server.
(client only sends move/action commands)
But thats too slow for an FPS. (only works in a fast LAN environment)

But a server can still reevaluate a clients actions.
If something is impossible for a client to do, then simply ban the client.

yes, i will do a speed check plus IP ban, there alot of ways to change IPs though, or so am hearing, so the power of that is also limtited, checking the speed is somewhat simple to do also but ofcourse takes some time to get right

someone was demonstrating 'cheat engine' to me and how it could do a speedhack, am surprised that it works that easily, i will also check the positions on the server to make sure its in a valid location... sounds like a c_content thing, am glad i released this game cuz even win or not, i learnt valuable stuff for my game

i think the movement hack that i saw was something like a save/load thing, like he saved his position then moved then loaded back the old position, which is why he could jump down from upstairs than warp back up.. no lag at all could produce that

actualy Wallhack is seeing someone through a wall. a 'Noclip hack' is what makes you go through walls and such yourself.

ahh i see, well thats what i saw, seems i need to become a cheater in order to make this game work lol to atleast understand the systems, i think i have a counter for alot of them, could someone explain to me how speedhacking works? its rather strange that they can use some external software to move faster than was coded

maybe they used the console. i mean maybe they wrote something like "time_factor =2" then they can move faster i think.

naah, it was a software called cheatengine, we ran some tests with it plus my movement code doesnt use time_step so i dont see how time_factor would affect it

Maybe it filters out the movement data which the client sends to the server and manipulates it.
Or is the whole movement calculate on the server?