42-nm-otool

Custom C implementation of nm and otool commands.

• ft_nm <args> displays the name list (symbol table of nlist structures) of the <args> files
• ft_tool displays the content of the (__TEXT,__text) segment

This project will makes you understand how Mach-O files are structured.

How to use

Build

make

# Clean commands
make clean
make fclean
make re

Usage

# Files supported: exec, .a, .so, .dylib, .o.
./ft_nm file
./ft_otool file

Implementation

• Support for archives
• Support for fat binaries
• Support for debug symbols (gcc -g <args> files).
• Many flags (see ./ft_nm -h or ./ft_otool -h)
• Checks for corruption

To understand how I implemented this program, you can refer to the medium article of this project.

File structure

/inc
    # Self made printf
    # Self made libc
    nm_otool.h
/src
    /cmd # Parse argv and set the program state
    /hande # Handle structure for magic files
    /parse # Parse the inner structures
    /shared

    # Root files
    ft_nm.c
    ft_otool.c

Predefined values

• mach-o/loader.h
• mach-o/ar.h
• mach-o/n-list.h
• mach-o/fat.h
• mach-o/machine.h