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#!/usr/bin/env python3.4
#
# Copyright (C) 2017 The Android Open Source Project
#
# 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.
#
import os
import re
from vts.runners.host import utils
class ElfParser(object):
"""This class reads an ELF file by parsing output of the command readelf.
Attributes:
_file_path: The path to the ELF file.
"""
def __init__(self, file_path):
self._file_path = file_path
@staticmethod
def isSupported():
"""Checks whether readelf is available."""
try:
utils.exe_cmd("readelf", "--version")
return True
except OSError:
return False
def isValid(self):
"""Checks size and first 4 bytes of the ELF file.
Returns:
A boolean representing whether _file_path is a valid ELF.
"""
try:
size = os.path.getsize(self._file_path)
# must be larger than 32-bit file header
if size < 52:
return False
except OSError:
return False
try:
with open(self._file_path, "rb") as f:
magic = f.read(4)
if list(bytearray(magic)) != [0x7f, 0x45, 0x4c, 0x46]:
return False
except IOError:
return False
return True
def listDependencies(self):
"""Lists the shared libraries that the ELF depends on.
Returns:
List of strings. The names of the depended libraries.
Raises:
OSError if readelf fails.
"""
pattern = re.compile("\\(NEEDED\\)\\s*Shared library: \[(.+)\]")
output = utils.exe_cmd("readelf", "--dynamic", self._file_path)
results = []
for line in output.split("\n"):
match = pattern.search(line)
if match:
results.append(match.group(1))
return results
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