I am trying to create a dynamic library for iOS and load it at runtime. After taking a look at this question and this answer, I have been doing it using iOSOpenDev and deploying everything on my iPhone. The xCode project for the dylib is called KDylibTwo and the files I modiefied are:
KDylibTwo.h
#import <Foundation/Foundation.h>
@interface KDylibTwo : NSObject
-(void)run;
@end
KDylibTwo.m
#import "KDylibTwo.h"
@implementation KDylibTwo
-(id)init
{
if ((self = [super init]))
{
}
return self;
}
-(void)run{
NSLog(@"KDylibTwo loadded.");
}
@end
In order to test if my library works, after building it for profiling (the way iOSOpenDev deploys it on iPhone), I can find it stored on my device at /usr/lib/libKDylibTwo.dylib
and built a tweak (again using iOSOpenDev), hooking the SpringBoard as follows:
#include <dlfcn.h>
%hook SBApplicationIcon
-(void)launch{
NSLog(@"\n\n\n\n\n\n\nSBHook For libKDylibTwo.dylib");
void* dylibLink = dlopen("/usr/lib/libKDylibTwo.dylib", RTLD_NOW);
if(dylibLink == NULL) {
NSLog(@"Loading failed.");
} else {
NSLog(@"Dylib loaded.");
void (*function)(void);
*(void **)(&function) = dlsym(dylibLink, "run");
if (function) {
NSLog(@"Function found.");
(*function)();
} else {
NSLog(@"Function NOT found");
}
}
NSLog(@"End of code");
%log;
%orig;
}
%end
After installing the tweak on the device and tapping on an icon (that would fire the hooked code), the Console output looks like:
Aug 28 13:03:35 Pudge SpringBoard[18254] <Warning>: SBHook For libKDylibTwo.dylib
Aug 28 13:03:35 Pudge SpringBoard[18254] <Warning>: Dylib loaded.
Aug 28 13:03:35 Pudge SpringBoard[18254] <Warning>: Function NOT found
Aug 28 13:03:35 Pudge SpringBoard[18254] <Warning>: End of code
Aug 28 13:03:35 Pudge SpringBoard[18254] <Warning>: -[<SBApplicationIcon: 0x1d5008c0> launch]
My question is what am I doing wrong and the the library's function is not called or executed! I think I should clarify that I am only talking about jailbroken devices and not App Store development, so please don't go ahead posting that it cannot be done!
Thank you in advance,
Panagiotis.