objc_class_dump

A object-c class dumper written in Python

The famous object-c class-dump (https://github.com/nygard/class-dump) is not very handy when doing some assembler language level IOS application ananlysis.

So I developed an objc_class_dump with Python from scrath.

This tool not only dumps the hierarchy of all object-c classes but also dumps raw information of some other sections.

It was developed with Python 2.7 and tested with Mach-O file with arm and aarch64 architecture.

How it works:

1. Detects Fat Mach-O header magic

2. Detects Mach-O Header magic

3. Loads all sections into memory

4. Build an import table based on LC_LOAD_DYLIB and DYLD_INFO

5. Build an virtual section for all imported symbols

6. Bind to imported symbols based on DYLD_INFO

7. Build hierarchy of object-c class list and non-lazy class list

How to use:

$ python objc_class_dump.py [options] <mach-o-file>

TODO:

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• dump __objc_protolist
• Documentation