Get SONAME, if exists, of input ELF file

r2_get_soname.py

#!/usr/bin/env python3
import r2pipe
import sys
from os.path import isfile
from typing import Optional


def get_soname(file_path) -> Optional[str]:
    r = r2pipe.open(file_path)
    barch: int = r.cmdj('iAj')['bins'][0]['bits']

    dynstr_addr: Optional[int] = None
    dynamic_addr: Optional[int] = None
    for section in r.cmdj('iSj'):
        if section['name'] == '.dynamic':
            dynamic_addr = section['vaddr']
        if section['name'] == '.dynstr':
            dynstr_addr = section['vaddr']

    soname: Optional[str] = None
    if dynamic_addr is not None and dynstr_addr is not None:
        s: int = dynamic_addr
        while True:
            d_tag: int = int(r.cmd(f'pb 0x8@{s}'), 2)
            if d_tag == 0xe:  # DT_SONAME
                if barch == 64:
                    s += 0x8
                    wsz = 'q'
                else:
                    s += 0x4
                    wsz = 'w'
                offset: int = r.cmdj(f'px{wsz}j@{s}')[0]
                soname = r.cmd(f'psz@{dynstr_addr + offset}')
                break
            if d_tag == 0:
                break
            if barch == 64:
                s += 0x10
            else:
                s += 0x8
    return soname


if __name__ == '__main__':
    in_file = sys.argv[1]
    assert isfile(in_file)
    print('SONAME=', get_soname(in_file))