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oat2dex.py
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oat2dex.py
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#!/usr/bin/env python
# oat2dex
# Copyright 2014 Jake Valletta (@jake_valletta)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Extract DEX from an ART ELF file
from re import finditer
from sys import argv, exc_info
import struct
__NAME__ = "oat2dex"
__VERSION__ = "1.0"
def usage():
print "Usage: %s [oat_file] ..." % __NAME__
def getSize(f, offset):
f.seek(offset)
try:
size = struct.unpack('i', f.read(4))[0]
except:
print "Unexpected error getting size:", exc_info()[0]
return -1
return size
def carveDex(oat_file, dex_offset, oat_file_name):
print "Found DEX signature at offset 0x%x" % dex_offset
size_offset = dex_offset + 32
dex_size = getSize(oat_file, size_offset)
if dex_size < 0:
print "Unable to get DEX size."
return -1
print "Got DEX size: 0x%x" % dex_size
carved_name = "%s.%s.odex" % (oat_file_name, hex(dex_offset))
print "Carving to: \'%s\'" % carved_name
try:
out_file = open(carved_name, 'wb')
oat_file.seek(dex_offset)
out_file.write(oat_file.read(dex_size))
out_file.close()
except(IOError, OSError) as e:
print "[ERROR] Unable to open output file!"
return -2
return 0
def processOat(oat_file_name):
rtn = 0
print "Processing \'%s\'" % oat_file_name
try:
f = open(oat_file_name, 'r')
try:
s = f.read()
hits = [m.start() for m in finditer('dex\n035', s)]
for dex_addr in hits:
rtn |= carveDex(f, dex_addr, oat_file_name)
finally:
f.close()
except (IOError, OSError) as e:
print "[ERROR] Unable to open file \'%s\'" % oat_file_name
return -1
return rtn
def main(args):
rtn = 0
for oat in args:
rtn |= processOat(oat)
return rtn
if __name__ == "__main__":
if len(argv) < 2:
print "[Error] You must specify at least 1 OAT file."
exit(usage())
exit(main(argv[1:]))