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# -*- coding: utf-8 -*-
"""Shared test cases."""
from __future__ import unicode_literals
import os
from dfvfs.file_io import tsk_file_io
from dfvfs.file_io import tsk_partition_file_io
from dfvfs.lib import errors
from dfvfs.path import tsk_path_spec
from dfvfs.path import tsk_partition_path_spec
from dfvfs.resolver import context
from tests import test_lib as shared_test_lib
class ImageFileTestCase(shared_test_lib.BaseTestCase):
"""The unit test case for storage media image based test data."""
_INODE_ANOTHER_FILE = 16
_INODE_PASSWORDS_TXT = 15
def setUp(self):
"""Sets up the needed objects used throughout the test."""
self._resolver_context = context.Context()
def _TestOpenCloseInode(self, parent_path_spec):
"""Test the open and close functionality using an inode.
Args:
parent_path_spec (PathSpec): parent path specification.
"""
path_spec = tsk_path_spec.TSKPathSpec(
inode=self._INODE_PASSWORDS_TXT, parent=parent_path_spec)
file_object = tsk_file_io.TSKFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 116)
file_object.close()
def _TestOpenCloseLocation(self, parent_path_spec):
"""Test the open and close functionality using a location.
Args:
parent_path_spec (PathSpec): parent path specification.
"""
path_spec = tsk_path_spec.TSKPathSpec(
location='/passwords.txt', parent=parent_path_spec)
file_object = tsk_file_io.TSKFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 116)
file_object.close()
def _TestSeek(self, parent_path_spec):
"""Test the seek functionality.
Args:
parent_path_spec (PathSpec): parent path specification.
"""
path_spec = tsk_path_spec.TSKPathSpec(
inode=self._INODE_ANOTHER_FILE, location='/a_directory/another_file',
parent=parent_path_spec)
file_object = tsk_file_io.TSKFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 22)
file_object.seek(10)
self.assertEqual(file_object.read(5), b'other')
self.assertEqual(file_object.get_offset(), 15)
file_object.seek(-10, os.SEEK_END)
self.assertEqual(file_object.read(5), b'her f')
file_object.seek(2, os.SEEK_CUR)
self.assertEqual(file_object.read(2), b'e.')
# Conforming to the POSIX seek the offset can exceed the file size
# but reading will result in no data being returned.
file_object.seek(300, os.SEEK_SET)
self.assertEqual(file_object.get_offset(), 300)
self.assertEqual(file_object.read(2), b'')
with self.assertRaises(IOError):
file_object.seek(-10, os.SEEK_SET)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), 300)
with self.assertRaises(IOError):
file_object.seek(10, 5)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), 300)
file_object.close()
def _TestRead(self, parent_path_spec):
"""Test the read functionality.
Args:
parent_path_spec (PathSpec): parent path specification.
"""
path_spec = tsk_path_spec.TSKPathSpec(
inode=self._INODE_PASSWORDS_TXT, location='/passwords.txt',
parent=parent_path_spec)
file_object = tsk_file_io.TSKFile(self._resolver_context)
file_object.open(path_spec=path_spec)
read_buffer = file_object.read()
expected_buffer = (
b'place,user,password\n'
b'bank,joesmith,superrich\n'
b'alarm system,-,1234\n'
b'treasure chest,-,1111\n'
b'uber secret laire,admin,admin\n')
self.assertEqual(read_buffer, expected_buffer)
# TODO: add boundary scenarios.
file_object.close()
class PartitionedImageFileTestCase(shared_test_lib.BaseTestCase):
"""The unit test case for partitioned storage media image based test data."""
_BYTES_PER_SECTOR = 512
# mmls test_data/tsk_volume_system.raw
# DOS Partition Table
# Offset Sector: 0
# Units are in 512-byte sectors
#
# Slot Start End Length Description
# 00: Meta 0000000000 0000000000 0000000001 Primary Table (#0)
# 01: ----- 0000000000 0000000000 0000000001 Unallocated
# 02: 00:00 0000000001 0000000350 0000000350 Linux (0x83)
# 03: Meta 0000000351 0000002879 0000002529 DOS Extended (0x05)
# 04: Meta 0000000351 0000000351 0000000001 Extended Table (#1)
# 05: ----- 0000000351 0000000351 0000000001 Unallocated
# 06: 01:00 0000000352 0000002879 0000002528 Linux (0x83)
def setUp(self):
"""Sets up the needed objects used throughout the test."""
self._resolver_context = context.Context()
def _TestOpenClose(self, parent_path_spec):
"""Test the open and close functionality.
Args:
parent_path_spec (PathSpec): parent path specification.
"""
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
part_index=2, parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 350 * self._BYTES_PER_SECTOR)
file_object.close()
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
part_index=13, parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
with self.assertRaises(errors.PathSpecError):
file_object.open(path_spec=path_spec)
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
location='/p2', parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 2528 * self._BYTES_PER_SECTOR)
file_object.close()
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
location='/p0', parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
with self.assertRaises(errors.PathSpecError):
file_object.open(path_spec=path_spec)
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
location='/p3', parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
with self.assertRaises(errors.PathSpecError):
file_object.open(path_spec=path_spec)
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
start_offset=(352 * self._BYTES_PER_SECTOR), parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 2528 * self._BYTES_PER_SECTOR)
file_object.close()
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
start_offset=(350 * self._BYTES_PER_SECTOR), parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
with self.assertRaises(errors.PathSpecError):
file_object.open(path_spec=path_spec)
def _TestSeek(self, parent_path_spec):
"""Test the seek functionality.
Args:
parent_path_spec (PathSpec): parent path specification.
"""
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
part_index=6, parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
partition_offset = 352 * self._BYTES_PER_SECTOR
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 2528 * self._BYTES_PER_SECTOR)
file_object.seek(0x7420)
self.assertEqual(file_object.get_offset(), 0x33420 - partition_offset)
self.assertEqual(
file_object.read(16), b'lost+found\x00\x00\x00\x00\x00\x00')
self.assertEqual(file_object.get_offset(), 0x33430 - partition_offset)
file_object.seek(-1251324, os.SEEK_END)
self.assertEqual(file_object.get_offset(), 0x36804 - partition_offset)
self.assertEqual(file_object.read(8), b'\x03\x00\x00\x00\x04\x00\x00\x00')
self.assertEqual(file_object.get_offset(), 0x3680c - partition_offset)
file_object.seek(4, os.SEEK_CUR)
self.assertEqual(file_object.get_offset(), 0x36810 - partition_offset)
self.assertEqual(file_object.read(7), b'\x06\x00\x00\x00\x00\x00\x00')
self.assertEqual(file_object.get_offset(), 0x36817 - partition_offset)
# Conforming to the POSIX seek the offset can exceed the file size
# but reading will result in no data being returned.
expected_offset = (2528 * self._BYTES_PER_SECTOR) + 100
file_object.seek(expected_offset, os.SEEK_SET)
self.assertEqual(file_object.get_offset(), expected_offset)
self.assertEqual(file_object.read(20), b'')
with self.assertRaises(IOError):
file_object.seek(-10, os.SEEK_SET)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), expected_offset)
with self.assertRaises(IOError):
file_object.seek(10, 5)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), expected_offset)
file_object.close()
def _TestRead(self, parent_path_spec):
"""Test the read functionality.
Args:
parent_path_spec (PathSpec): parent path specification.
"""
path_spec = tsk_partition_path_spec.TSKPartitionPathSpec(
part_index=6, parent=parent_path_spec)
file_object = tsk_partition_file_io.TSKPartitionFile(self._resolver_context)
partition_offset = 352 * self._BYTES_PER_SECTOR
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 2528 * self._BYTES_PER_SECTOR)
file_object.seek(0x2e900 - partition_offset)
expected_data = (
b'\xc0\x41\x00\x00\x00\x30\x00\x00\xc8\x8c\xb9\x52\xc8\x8c\xb9\x52'
b'\xc8\x8c\xb9\x52\x00\x00\x00\x00\x00\x00\x02\x00\x18\x00\x00\x00')
self.assertEqual(file_object.read(32), expected_data)
file_object.close()
class SylogTestCase(shared_test_lib.BaseTestCase):
"""The unit test case for the syslog test data."""
def _TestGetSizeFileObject(self, file_object):
"""Runs the get size tests on the file-like object.
Args:
file_object (file): file-like object with the test data.
"""
self.assertEqual(file_object.get_size(), 1247)
def _TestReadFileObject(self, file_object, base_offset=167):
"""Runs the read tests on the file-like object.
Args:
file_object (file): file-like object with the test data.
base_offset (Optional[int]): base offset use in the tests.
"""
file_object.seek(base_offset, os.SEEK_SET)
self.assertEqual(file_object.get_offset(), base_offset)
expected_buffer = (
b'Jan 22 07:53:01 myhostname.myhost.com CRON[31051]: (root) CMD '
b'(touch /var/run/crond.somecheck)\n')
read_buffer = file_object.read(95)
self.assertEqual(read_buffer, expected_buffer)
expected_offset = base_offset + 95
self.assertEqual(file_object.get_offset(), expected_offset)
def _TestSeekFileObject(self, file_object, base_offset=167):
"""Runs the seek tests on the file-like object.
Args:
file_object (file): file-like object with the test data.
base_offset (Optional[int]): base offset use in the tests.
"""
file_object.seek(base_offset + 10)
self.assertEqual(file_object.read(5), b'53:01')
expected_offset = base_offset + 15
self.assertEqual(file_object.get_offset(), expected_offset)
file_object.seek(-10, os.SEEK_END)
self.assertEqual(file_object.read(5), b'times')
file_object.seek(2, os.SEEK_CUR)
self.assertEqual(file_object.read(2), b'--')
# Conforming to the POSIX seek the offset can exceed the file size
# but reading will result in no data being returned.
file_object.seek(2000, os.SEEK_SET)
self.assertEqual(file_object.get_offset(), 2000)
self.assertEqual(file_object.read(2), b'')
# Test with an invalid offset.
with self.assertRaises(IOError):
file_object.seek(-10, os.SEEK_SET)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), 2000)
# Test with an invalid whence.
with self.assertRaises(IOError):
file_object.seek(10, 5)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), 2000)
class PaddedSyslogTestCase(SylogTestCase):
"""The unit test case for padded syslog test data.
The syslog test data is padded with '=' characters.
"""
def setUp(self):
"""Sets up the needed objects used throughout the test."""
self.padding_size = 0
def _TestGetSizeFileObject(self, file_object):
"""Runs the get size tests on the file-like object.
Args:
file_object (file): file-like object with the test data.
"""
self.assertEqual(file_object.get_size(), 1247 + self.padding_size)
def _TestSeekFileObject(self, file_object, base_offset=167):
"""Runs the seek tests on the file-like object.
Args:
file_object (file): file-like object with the test data.
base_offset (Optional[int]): base offset use in the tests.
"""
file_object.seek(base_offset + 10)
self.assertEqual(file_object.read(5), b'53:01')
expected_offset = base_offset + 15
self.assertEqual(file_object.get_offset(), expected_offset)
file_object.seek(-10 - self.padding_size, os.SEEK_END)
self.assertEqual(file_object.read(5), b'times')
file_object.seek(2, os.SEEK_CUR)
self.assertEqual(file_object.read(2), b'--')
# Conforming to the POSIX seek the offset can exceed the file size
# but reading will result in no data being returned.
file_object.seek(2000, os.SEEK_SET)
self.assertEqual(file_object.get_offset(), 2000)
self.assertEqual(file_object.read(2), b'')
# Test with an invalid offset.
with self.assertRaises(IOError):
file_object.seek(-10, os.SEEK_SET)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), 2000)
# Test with an invalid whence.
with self.assertRaises(IOError):
file_object.seek(10, 5)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), 2000)
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