def test_subtype(self):
start = self.offsets['start_list'][0]
_record = structure.AnonymousRecord(self.memory_handler, start, 40)
word_size = self._target.get_word_size()
f1 = fieldtypes.Field('f1', 0 * word_size, fieldtypes.ZEROES,
word_size, False)
f4 = fieldtypes.Field('f2', 3 * word_size, fieldtypes.ZEROES,
word_size, False)
# offset in the substruct
fs2 = fieldtypes.PointerField('Back', 0, word_size)
fs2.value = start
fs3 = fieldtypes.PointerField('Next', 1 * word_size, word_size)
fs3.value = start
# the new field sub record
new_field = fieldtypes.RecordField(_record, 1 * word_size, 'list',
'LIST_ENTRY', [fs2, fs3])
# fieldtypes.FieldType.makeStructField(_record, 1*word_size, 'LIST_ENTRY', [fs2, fs3], 'list')
# add them
fields = [f1, new_field, f4]
#_record.add_fields(fields)
_record_type = structure.RecordType('struct_text', 40, fields)
_record.set_record_type(_record_type)
self.assertEqual(len(_record), 40)
f1, f2, f3 = _record.get_fields()
self.assertEqual(len(f1), word_size)
self.assertEqual(len(f2), word_size * 2)
self.assertEqual(len(f3), word_size)
self.assertEqual(f2.name, 'list')
self.assertIsInstance(f2.field_type, fieldtypes.FieldTypeStruct)
self.assertEqual(f2.field_type.name, 'LIST_ENTRY')
print _record.to_string()
def test_is_types(self):
# def __init__(self, astruct, offset, typename, size, isPadding):
ptr = fieldtypes.PointerField('ptr_0', 8, 4)
self.assertFalse(ptr.is_string())
self.assertTrue(ptr.is_pointer())
self.assertFalse(ptr.is_zeroes())
self.assertFalse(ptr.is_array())
self.assertFalse(ptr.is_integer())
def test_is_types(self):
from haystack.reverse import fieldtypes
#def __init__(self, astruct, offset, typename, size, isPadding):
ptr = fieldtypes.PointerField(self.st, 8, fieldtypes.FieldType.POINTER,
4, False)
self.assertFalse(ptr.isString())
self.assertTrue(ptr.isPointer())
self.assertFalse(ptr.isZeroes())
self.assertFalse(ptr.isArray())
self.assertFalse(ptr.isInteger())
def make_fields(self, _record, offset, size):
# iterate on all offsets . NOT assert( size ==
# self._target_platform.get_word_size())
assert (offset % self._word_size == 0
) # vaddr and offset should be aligned
log.debug('checking Pointer')
_bytes = _record.bytes
fields = []
ctypes_utils = self._target.get_target_ctypes_utils()
while size >= self._word_size:
value = ctypes_utils.unpackWord(_bytes[offset:offset +
self._word_size])
# check if pointer value is in range of _memory_handler and set self.comment to pathname value of pointer
# TODO : if bytes 1 & 3 == \x00, maybe utf16 string
if not self._memory_handler.is_valid_address(value):
size -= self._word_size
offset += self._word_size
continue
# FIXME 20151103 dont ignore it
# what will it break ?
if False:
# 20151026 - if aligned, ignore it
if value % self._target.get_word_size():
size -= self._word_size
offset += self._word_size
continue
# we have a pointer
log.debug('checkPointer offset:%s value:%s' % (offset, hex(value)))
field = fieldtypes.PointerField('ptr_%d' % offset, offset,
self._word_size)
# TODO: leverage the context._function_names
# if value in structure._context._function_names:
# field.comment = ' %s::%s' % (os.path.basename(self._memory_handler.get_mapping_for_address(value).pathname),
# structure._context._function_names[value])
# else:
# field.comment = self._memory_handler.get_mapping_for_address(value).pathname
field.comment = self._memory_handler.get_mapping_for_address(
value).pathname
fields.append(field)
size -= self._word_size
offset += self._word_size
return fields
def rename_record_type(self, _members, offset):
"""
Change the type of the 2 pointers to a substructure.
Rename the field to reflect this .
Rename the _record ?
:param _context:
:param _members:
:param offset:
:param head_addr:
:return:
"""
# we look at each item and get the most common signature between all items
best_member = self.find_common_type_signature(_members)
# use member[1] instead of head, so that we have a better chance for field types.
# in head, back pointer is probably a zero value, not a pointer field type.
_context = self._process_context.get_context_for_address(best_member)
_record = _context.get_record_for_address(best_member)
# we need two pointer fields to create a substructure.
## Check if field at offset is a pointer, If so change it name, otherwise split
old_next = _record.get_field_at_offset(offset)
old_back = _record.get_field_at_offset(offset + self._word_size)
#
next_field = fieldtypes.PointerField('Next', 0, self._word_size)
back_field = fieldtypes.PointerField('Back', self._word_size,
self._word_size)
sub_fields = [next_field, back_field]
# make a substructure
new_field = fieldtypes.RecordField(_record, offset, 'list',
'LIST_ENTRY', sub_fields)
fields = [x for x in _record.get_fields()]
fields.remove(old_next)
if old_next == old_back:
# its probably a LIST_ENTRY btw.
log.debug("old_next == old_back, aborting")
return _record.record_type
fields.remove(old_back)
fields.append(new_field)
fields.sort()
# create a new type
head_addr = _members[0]
_record_type = structure.RecordType('list_%x' % head_addr,
len(_record), fields)
log.debug("Created Record Type %s", _record_type.to_string())
# apply the fields template to all members of the list
for list_item_addr in _members:
_context = self._process_context.get_context_for_address(
list_item_addr)
_item = _context.get_record_for_address(list_item_addr)
### KEEP THIS
if len(_item) != len(_record):
log.warning("x2 linked reverser: len(_item) != len(_record)")
else:
_item.set_record_type(_record_type, True)
# push the LIST_ENTRY type into the context/memory_handler
rev_context = self._memory_handler.get_reverse_context()
rev_context.add_reversed_type(_record_type, _members)
# change the list_head name back
_context = self._process_context.get_context_for_address(head_addr)
_context.get_record_for_address(head_addr).set_name('list_head')
return _record_type
