class MftAnalyser:
def __init__(self, mft_table: MftTable, partition: NtfsPartition):
self.mft_table = mft_table
self.partition = partition
self.bitmap = Bitmap(partition=partition, bitmap_data_runs=self.mft_table.get_record(6).attrs["data_runs"])
self.deleted_records = dict()
def analyse(self, callback):
no_of_records = self.mft_table.record_count
for i in range(24, no_of_records):
callback(i + 1, no_of_records)
record = self.mft_table.get_record(i)
if record:
if record.is_valid() and record.is_file() and record.is_deleted():
if "data_runs" in record.attrs:
if not self.bitmap.check_clusters_alloc(record.attrs["data_runs"]):
path = self.build_abs_path(
seq_no=record.attrs["parent_dir_seq_no"],
record_number=record.attrs["parent_dir_file_req_no"],
)
result = {
"data": record,
"is_orphan": path["is_orphan"],
"path": "/".join(path["dir_name"]),
}
self.deleted_records[record.record_number] = result
def recover_selected(self, record_number):
if record_number in self.deleted_records.keys():
self.mft_table.activate_record(record_number=record_number)
def recover_all(self):
for record_number in self.deleted_records.keys():
print("recovering MFT record nb: {}".format(record_number))
self.mft_table.activate_record(record_number=record_number)
def build_abs_path(self, seq_no: int, record_number: int, path=None):
if path is None:
path = {"rec_no": [], "dir_name": [], "is_orphan": False}
if record_number == 5:
# base case, tree root reached
path["rec_no"].append(5)
path["dir_name"].append("/")
# path.append((5, '/', True))
return path
record = self.mft_table.get_record(record_number=record_number)
if record.is_valid() and record.is_directory():
if record.seq_no == seq_no:
# append tuple to list
path["rec_no"].append(record_number)
path["dir_name"].append(record.attrs["file_name"])
# path.append((record_number, record.attrs['file_name'], not record.is_deleted()))
parent_record_number = record.attrs["parent_dir_file_req_no"]
parent_seq_no = record.attrs["parent_dir_seq_no"]
# tail recursive function call
self.build_abs_path(seq_no=parent_record_number, record_number=parent_seq_no, path=path)
path["is_orphan"] = True
return path
def __init__(self, mft_table: MftTable, partition: NtfsPartition):
self.mft_table = mft_table
self.partition = partition
self.bitmap = Bitmap(partition=partition, bitmap_data_runs=self.mft_table.get_record(6).attrs["data_runs"])
self.deleted_records = dict()
def test_check_cluster_alloc(self):
data_runs = [(31, 123623)]
bitmap = Bitmap(partition=self.partition, bitmap_data_runs=data_runs)
self.assertTrue(bitmap.check_cluster_alloc(4))
self.assertFalse(bitmap.check_cluster_alloc(127848))
