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elf_an.py
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elf_an.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
# -*- mode: python; -*-
#
# elf_an - elf file format analysis
# Copyright by n0fate - [email protected], [email protected]
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""
@author: Kyeongsik Lee
@license: GNU General Public License 2.0 or later
@contact: [email protected] [email protected]
"""
"""Module for dealing with x86 architecture stuff
"""
import sys
import binascii
import struct
# define
ELF_SIG = '7f454c46' # ELF Signature
SYMBOL_SIZE = 16
# Let's map the elf file format types
#Elf32_Addr = c_uint # unsigned program address
#Elf32_Half = c_ushort # unsigned medium integer
#Elf32_Off = c_uint # unsigned file offset
#Elf32_Sword = c_int # signed large integer
#Elf32_Word = c_uint # Unsigned large integer
#
#class ELF32HEADER(Structure):
# _fields_ = [
# ("e_type", Elf32_Half),
# ("e_machine", Elf32_Half),
# ("e_version", Elf32_Word),
# ("e_entry", Elf32_Addr),
# ("e_phoff", Elf32_Off),
# ("e_shoff", Elf32_Off),
# ("e_flags", Elf32_Word),
# ("e_ehsize", Elf32_Half),
# ("e_phentsize", Elf32_Half),
# ("e_phnum", Elf32_Half),
# ("e_shentsize", Elf32_Half),
# ("e_shnum", Elf32_Half),
# ("e_shstrndx", Elf32_Half)
# ]
###############################################################################
#
# Class: elf32_an() - 2010-11-01
# Description: This analysis module can support Intel X86 Architecture
# We need to have more research time ;)
#
###############################################################################
class elf32_an():
def __init__(self, filename):
self.filename = filename
self.buf = ""
self.fp = 0
self.header = []
def load(self):
self.fp = open(self.filename, 'rb')
self.buf = self.fp.read()
if ELF_SIG != binascii.b2a_hex(self.buf[0:4]):
return 0
return 1
def close(self):
self.fp.close()
def getheader(self):
self.header = struct.unpack('=16sHHIIIIIHHHHHH', self.buf[0:52])
return self.header
def getmachine(self):
machine = int(self.header[2])
return machine
def getshoff(self):
shoff = int(self.header[6])
return shoff
def getshsize(self):
shsize = int(self.header[11])
return shsize
def getshcount(self):
shcount = int(self.header[12])
return shcount
#### section header ####
def getsecheader(self, offset, size, count):
return header
def getstrsec(self, offset, size, count):
for i in range(0, count):
pos = offset + size*i
section_header = struct.unpack('=IIIIIIIIII', self.buf[pos:pos+size])
if section_header[1] == 0x03 and section_header[0] == 0x09:
return section_header
def getsymsec(self, offset, size, count):
for i in range(0, count):
pos = offset + size*i
section_header = struct.unpack('=IIIIIIIIII', self.buf[pos:pos+size])
if section_header[1] == 0x02:
return section_header
#### get symbol list (dictionary) ####
def getsymbol(self, offset, size, str_offset, str_size):
symbol_list = {}
strtable = self.buf[str_offset:str_offset+str_size]
for i in range(0, size, SYMBOL_SIZE):
pos = offset + i
symbol = struct.unpack('=IIIBBH', self.buf[pos:pos+SYMBOL_SIZE])
symbolname = strtable[symbol[0]:symbol[0]+strtable[symbol[0]:].index('\x00')]
if symbol[1] == 0:
continue
symbol_list[symbolname] = symbol[1]
#print 'symbolname: %s, address: %x'%(symbolname, int(symbol[1]))
return symbol_list
def main():
elf = elf32_an(sys.argv[1])
nret = elf.load()
if 0 == nret:
return 0
header = elf.getheader()
shoff = elf.getshoff()
if 0 == shoff:
return 0
shsize = elf.getshsize()
shcount = elf.getshcount()
section_header = elf.getsymsec(shoff, shsize, shcount)
strtab_header = elf.getstrsec(shoff, shsize, shcount)
symbol_list = elf.getsymbol(section_header[4], section_header[5], strtab_header[4], strtab_header[5])
print '%x'%symbol_list['IdlePTD']
if __name__ == "__main__":
main()