blob: 97e4dc40a4fc473100076bbec5bf1b939da3b406 [file] [log] [blame]
# elftools example:
# A simple example that shows some usage of the low-level API pyelftools
# provides versus the high-level API.
# Eli Bendersky (
# This code is in the public domain
from __future__ import print_function
import sys
# If elftools is not installed, maybe we're running from the root or examples
# dir of the source distribution
import elftools
except ImportError:
sys.path.extend(['.', '..'])
from elftools.elf.elffile import ELFFile
from elftools.elf.sections import SymbolTableSection
def process_file(filename):
print('Processing file:', filename)
with open(filename) as f:
def section_info_lowlevel(stream):
print('Low level API...')
# We'll still be using the ELFFile context object. It's just too
# convenient to give up, even in the low-level API demonstation :-)
elffile = ELFFile(stream)
# The e_shnum ELF header field says how many sections there are in a file
print(' %s sections' % elffile['e_shnum'])
# We need section #40
section_offset = elffile['e_shoff'] + 40 * elffile['e_shentsize']
# Parse the section header using structs.Elf_Shdr
section_header = elffile.structs.Elf_Shdr.parse_stream(stream)
# Some details about the section. Note that the section name is a pointer
# to the object's string table, so it's only a number here. To get to the
# actual name one would need to parse the string table section and extract
# the name from there (or use the high-level API!)
print(' Section name: %s, type: %s' % (
section_header['sh_name'], section_header['sh_type']))
def section_info_highlevel(stream):
print('High level API...')
elffile = ELFFile(stream)
# Just use the public methods of ELFFile to get what we need
print(' %s sections' % elffile.num_sections())
section = elffile.get_section(40)
# A section type is in its header, but the name was decoded and placed in
# a public attribute.
print(' Section name: %s, type: %s' %(, section['sh_type']))
# But there's more... If this section is a symbol table section (which is
# the case in the sample ELF file that comes with the examples), we can
# get some more information about it.
if isinstance(section, SymbolTableSection):
print(" It's a symbol section with %s symbols" % section.num_symbols())
print(" The name of symbol #60 is: %s" % (
if __name__ == '__main__':
for filename in sys.argv[1:]: