How to deal with custom type class in cydia java hooking?

Question

I'm using cydia substrate to hook a method in a third party app, which means I have no access to the source code of it. The method I want to hook has a custom type parameter, like this :

methodToHook(com.thirdparty.app.CustomClass param1)

But to hook the method, I need to "tell" cydia the parameters' type of this method, like this:

MS.hookClassLoad("com.thirdparty.app.CustomClass",
                new MS.ClassLoadHook() {
                   @SuppressWarnings("unchecked")
                public void classLoaded(Class<?> CustomClass) {
                       Log.i("misty", "CustomClassclassLoaded");
                      Constructor constructor1;
                      try {
                          constructor1 = CustomClass.getMethod("CustomClass", CustomClass.class);

So how could I give it the real "CustomClass.class" to complete the hook?

@DerGolem Cydia is supporting android now, check this out [http://www.cydiasubstrate.com/](http://www.cydiasubstrate.com/) — Misty Zhu, Jan 26 '15 at 08:58

score 0 · Answer 1 · answered Apr 02 '15 at 12:23

I think you have gone one level too deep in your MS.hookClassLoad call.

Try this

MS.hookClassLoad("com.thirdparty.app", new MS.ClassLoadHook() {
    public void classLoaded(Class<?> CustomClass) {
        Method getClass; try {
            getClass = CustomClass.getMethod("getClass", Integer.TYPE);

        } catch (NoSuchMethodException e) {
            getClass = null;
        }

        if (getClass != null) {
            final MS.MethodPointer old = new MS.MethodPointer();

            MS.hookMethod(CustomClass, getClass, new MS.MethodHook() {
                public Object invoked(Object CustomClass, Object... args)
                        throws Throwable
                {

                    int ModifiedValue = (Integer) old.invoke(CustomClass, args);
                    return ModifiedValue & ~0x0000ff00 | 0x00ff0000;
                }
            }, old);
        }
    }
});

Where com.thirdparty.app is the Application
and CustomClass is the Class being loaded
and getClass is the internal Method within CustomClass.

How to deal with custom type class in cydia java hooking?

1 Answers1