iOS Obj-C Hooking Converting Hex to String

Question

I am trying to hook a simple function in Theos:

- (_Bool)sendData:(id)arg1 {
    NSLog(@"%@", arg1);
    _Bool r = %orig;
    return r;
};

But the output I get is in hex:

<3c736f61 70656e76 3a456e76 656c6f70 6520786d 6c6e733a 736f6170 656e763d>

I have tried a few conversion codes found from stack overflow but have had no luck printing the ASCII text from that.

Any help is appreciated. Thank you!

The output is in hex because that is the way NSLog displays it. Using a type of `id` is a bad idea, use the real type. We can't tell what should happen it we don't know the type? `NSData`, `NSString`, something else? — zaph, Feb 10 '15 at 12:39
Yes I know, I would like to know how I can output it in ASCII. I've tried converting to Char *. or used [arg1 UTF8String] no luck — d123, Feb 10 '15 at 12:42
@Zaph you don't seem to understand me, I'm hooking a function, I don't know the type. — d123, Feb 10 '15 at 12:42
Add your code to the question and change id to the real type. — zaph, Feb 10 '15 at 12:43
Use `NSLog(@"%@", NSStringFromClass([arg1 class]))` for determine object class. — rock88, Feb 10 '15 at 12:52
@rock88 Yes, but I cannot be sure that the type will always be the same all the time. — d123, Feb 10 '15 at 12:56
@rock88 just in case you're wondering the class output NSConcreteMutableData — d123, Feb 10 '15 at 13:01
if ([arg1 isKindOfClass:[NSData class]){NSString *string = [[NSString alloc] initWithData:(NSData *)arg1 encoding:NSUTF8StringEncoding];}. Note that for your thing, there is a few of the encoding that works. — Larme, Feb 10 '15 at 13:01
@Larme Wonderful that worked! You wanna place an answer then I'll be able to mark it as correct — d123, Feb 10 '15 at 13:05

score 1 · Accepted Answer · answered Feb 10 '15 at 13:58

From you data output, your response is: <soapenv:Envelope xmlns:soapenv=

if ([arg1 isKindOfClass:[NSData class])
{
    NSString *string = [[NSString alloc] initWithData:(NSData *)arg1 encoding:NSUTF8StringEncoding];
}

I tried various encodings, and NSUTF8StringEncoding wasn't the only one to give the correct response. So you may want to check which one is really the appropriate one.

iOS Obj-C Hooking Converting Hex to String

1 Answers1