scripts/readelf.py

   1 #-------------------------------------------------------------------------------
   2 # readelf.py
   3 #
   4 # A clone of 'readelf' in Python, based on the pyelftools library
   5 #
   6 # Eli Bendersky (eliben@gmail.com)
   7 # This code is in the public domain
   8 #-------------------------------------------------------------------------------
   9 import sys
  10 from optparse import OptionParser
  11
  12 # If elftools is not installed, maybe we're running from the root or scripts
  13 # dir of the source distribution
  14 #
  15 try:
  16     import elftools
  17 except ImportError:
  18     sys.path.extend(['.', '..'])
  19
  20 from elftools.common.exceptions import ELFError
  21 from elftools.elf.elffile import ELFFile
  22 from elftools.elf.descriptions import (
  23     describe_ei_class, describe_ei_data, describe_ei_version,
  24     describe_ei_osabi, describe_e_type, describe_e_machine,
  25     describe_e_version_numeric,
  26     )
  27
  28
  29 class ReadElf(object):
  30     """ display_* methods are used to emit output into the output stream
  31     """
  32     def __init__(self, file, output):
  33         """ file:
  34                 stream object with the ELF file to read
  35
  36             output:
  37                 output stream to write to
  38         """
  39         self.elffile = ELFFile(file)
  40         self.output = output
  41
  42     def display_file_header(self):
  43         """ Display the ELF file header
  44         """
  45         self._emitline('ELF Header:')
  46         self._emit('  Magic:   ')
  47         self._emitline(' '.join('%2.2x' % ord(b)
  48                                     for b in self.elffile.e_ident_raw))
  49         header = self.elffile.header
  50         e_ident = header['e_ident']
  51         self._emitline('  Class:                             %s' %
  52                 describe_ei_class(e_ident['EI_CLASS']))
  53         self._emitline('  Data:                              %s' %
  54                 describe_ei_data(e_ident['EI_DATA']))
  55         self._emitline('  Version:                           %s' %
  56                 describe_ei_version(e_ident['EI_VERSION']))
  57         self._emitline('  OS/ABI:                            %s' %
  58                 describe_ei_osabi(e_ident['EI_OSABI']))
  59         self._emitline('  ABI Version:                       %d' %
  60                 e_ident['EI_ABIVERSION'])
  61         self._emitline('  Type:                              %s' %
  62                 describe_e_type(header['e_type']))
  63         self._emitline('  Machine:                           %s' %
  64                 describe_e_machine(header['e_machine']))
  65         self._emitline('  Version:                           %s' %
  66                 describe_e_version_numeric(header['e_version']))
  67
  68     def _emit(self, s):
  69         """ Emit an object to output
  70         """
  71         self.output.write(str(s))
  72
  73     def _emitline(self, s):
  74         """ Emit an object to output, followed by a newline
  75         """
  76         self.output.write(str(s) + '\n')
  77
  78
  79 def main():
  80     optparser = OptionParser()
  81     options, args = optparser.parse_args()
  82
  83     with open(args[0], 'rb') as file:
  84         try:
  85             readelf = ReadElf(file, sys.stdout)
  86             readelf.display_file_header()
  87         except ELFError as ex:
  88             sys.stderr.write('ELF read error: %s\n' % ex)
  89             sys.exit(1)
  90
  91
  92 #-------------------------------------------------------------------------------
  93 if __name__ == '__main__':
  94     main()
  95