Help/Support MSHookFunction doesn't work

[jux3z 0]

Hello everyone!

I'm trying to hack a game with Logos (MonkeyDev project).
So I have dump.cs with function offsets.
But when I try to

MSHookFunction((void *)getRealOffset(0xoffset), (void *)_replaceFunc, (void **)&origFunc) 

nothing happens (NSLog in _replaceFunc doesn't print something)
Offset is real, because writeData(0xoffset, data) works correctly.

iOS: 11.3.1
MonkeyDev Xcode project
substrate.h

Any ideas? ?

[Ted2 39.1k iPhone 13 Pro 16.0 Donor]

The function you're hooking, are you actually returning something?

[jux3z 0]

10 hours ago, Ted2 said:

The function you're hooking, are you actually returning something?

No, it's just Update function 
 

private void Update(); // 0x101A25EA4

So, code:
 

void (*Player_Update)(void *player);

void _Player_Update(void *player) {

    NSLog(@"Player UPDATE!"); // Just for test

    Player_Update(player);

}

%hook UnityAppController

- (void)applicationDidBecomeActive:(id)arg1

{
	NSLog(@"did become active"); // It works
    MSHookFunction((void *)(getRealOffset(0x101A25EA4)), (void *)_Player_Update, (void **)&Player_Update);

    %orig;
}

%end

P.S.: I tried to hook not only the Update function, but also many others. No effect

[Ted2 39.1k iPhone 13 Pro 16.0 Donor]

What if you put that mshook outside the applicationdidbecomeactive??

 

%ctor {

Mshook.......

}

[jux3z 0]

1 hour ago, Ted2 said:

What if you put that mshook outside the applicationdidbecomeactive??

 

%ctor {

Mshook.......

}

Thanks for the idea! But it also doesn't work

[Ted2 39.1k iPhone 13 Pro 16.0 Donor]

46 minutes ago, jux3z said:

Thanks for the idea! But it also doesn't work

Hmm weird. What if you put some silly if statement around it?

 

Also how do you get NSLog to see? I've wanted to get that to work too, but couldn't get it.

[jux3z 0]

I use https://github.com/AloneMonkey/MonkeyDev Xcode project, so I can see all debug messages in debug console. 
 

48 minutes ago, Ted2 said:

Hmm weird. What if you put some silly if statement around it?

I think the problem may be in linking CydiaSubstrate framework.

There is

#import <substrate.h>

but it seems that this function (MSHookFunction) does nothing. 
 

[Ted2 39.1k iPhone 13 Pro 16.0 Donor]

MSHook doesn't work on NJB. Only on JB, you know that?

[jux3z 0]

I would like to try to use symbols (MSFindSymbol), but there are no symbols in IDA

[Ted2 39.1k iPhone 13 Pro 16.0 Donor]

2 minutes ago, jux3z said:

I would like to try to use symbols (MSFindSymbol), but there are no symbols in IDA

Then you can't use it. But again, you make a JB tweak or a NJB?