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Demonstration code to detect runtime method swizzling with Cydia Substrate/Cycript.
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// Compile with: | |
// clang catchredir.m -o catchredir -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/ -miphoneos-version-min=7 -framework Foundation | |
#import <Foundation/Foundation.h> | |
#import <stdio.h> | |
#import <objc/runtime.h> | |
@interface UrlConnection : NSObject | |
@property (strong) NSString *url; | |
- (void)connect; | |
@end | |
@implementation UrlConnection | |
- (void)connect { | |
// Connect to a server, or other behavior the attacker wants to change | |
} | |
@end | |
int main() { | |
Class ucclass = objc_getClass("UrlConnection"); | |
SEL sel = sel_getUid("connect"); | |
IMP runtimeimp, ucconnectimp = class_getMethodImplementation(ucclass, sel); | |
while(1) { | |
[NSThread sleepForTimeInterval:10.0f]; | |
ucclass = objc_getClass("UrlConnection"); | |
sel = sel_getUid("connect"); | |
runtimeimp = class_getMethodImplementation(ucclass, sel); | |
printf("pointer %p and %p\n", ucconnectimp, runtimeimp); | |
if (runtimeimp != ucconnectimp) printf("Modification Detected\n"); | |
} | |
return 0; | |
} |
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