cachecopier

cachecopier.m

// cachecopier.m
// Copy the dyld_shared_cache into /var/tmp.
// Credits to planetbeing for the ASLR trick and theiostream for implementation.

// COMPILATION:
// arm-apple-darwin10-llvm-gcc-4.2 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -framework Foundation -mdynamic-no-pic -o cachecopier cachecopier.m

#import <Foundation/Foundation.h>

int main() {
	NSString *const cache_path = @"/System/Library/Caches/com.apple.dyld/";
	
	NSAutoreleasePool *pool = [NSAutoreleasePool new];
	NSFileManager *fm = [NSFileManager defaultManager];
	
	NSString *caches[3] = {@"dyld_shared_cache_armv6", @"dyld_shared_cache_armv7", @"dyld_shared_cache_armv7s"};
	int i;
	for (i=0; i<3; i++) {
		if ([fm fileExistsAtPath:[cache_path stringByAppendingString:caches[i]]]) {
			NSString *cache = caches[i];
			
			printf("Copying cache %s\n", [cache UTF8String]);
			BOOL ret = [fm copyItemAtPath:[cache_path stringByAppendingString:cache] toPath:[@"/var/tmp/" stringByAppendingString:cache] error:nil];
			
			if (!ret) {
				fprintf(stderr, "Failed to copy cache %s to /var/tmp.\n", [cache UTF8String]);
				return 1;
			}
		}
		
		goto success;
	}
	
	fprintf(stderr, "Found no caches.\n");
	return 2;
	
	success:
	[pool drain];
	return 0;
}