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|
#!/usr/bin/env python
# RaidGuessFS, a FUSE pseudo-filesystem to guess RAID parameters of a damaged device
# Copyright (C) 2015 Ludovic Pouzenc <ludovic@pouzenc.fr>
#
# This file is part of RaidGuessFS.
#
# RaidGuessFS is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# RaidGuessFS is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with RaidGuessFS. If not, see <http://www.gnu.org/licenses/>
import os, multiprocessing, binascii, logging
import mydisks
def do_find_files(d,state):
logging.info("Enter do_find_files()")
try:
state['state'] = 'loading'
ref_paths = state['filepaths']
ref_count = len(ref_paths)
ref_big_hash = {}
for ref_no in range(ref_count):
path = state['filepaths'][ref_no]
logging.debug("Try to open ref. file '%s'"%path)
with open(path, 'rb') as fd:
logging.info("Loading ref. file '%s'"%path)
warn_empty = True
warn_dup = True;
while True:
ref_offset = fd.tell()
data = fd.read(512)
if not data:
break
if data == '\0'*512:
if warn_empty:
logging.info("Ignoring empty sector in '%s'@0x%011x"%(path,ref_offset))
warn_empty = False
else:
logging.debug("Ignoring empty sector in '%s'@0x%011x"%(path,ref_offset))
elif data in ref_big_hash:
(prev_ref_no, prev_ref_offset) = ref_big_hash[data]
if warn_dup:
logging.info("Non-unique sector found in ref. files ('%s'@0x%011x and '%s'@0x%011x)"%
(prev_ref_no, prev_ref_offset, ref_no, ref_offset))
warn_dump = False
else:
logging.debug("Non-unique sector found in ref. files ('%s'@0x%011x and '%s'@0x%011x)"%
(prev_ref_no, prev_ref_offset, ref_no, ref_offset))
else:
# Hash in memory the whole read sector and store it's provenance
ref_big_hash[data] = (ref_no, ref_offset)
start = 0 # FIXME : make it tunable
start = 0x00132870000
end = min(d.disks_size)
one_per_thousand = (end - start) / 1000
one_per_thousand = one_per_thousand + ( (-one_per_thousand)%512 )
logging.debug("start/end/1pm : %i / %i / %i"%(start,end,one_per_thousand))
state['found'] = []
state['progress'] = 0.0
state['raw_matches'] = 0
state['state'] = 'searching'
raw_matches = []
for offset in xrange(start, end, 512):
for disk_no in range(d.disk_count):
# Read disks sector by sector and try to match sectors present in ref_files (through ref_big_hash)
d.disks[disk_no].seek(offset)
data = d.disks[disk_no].read(512)
if data in ref_big_hash:
(ref_no, ref_offset) = ref_big_hash[data]
a = {
'ref_no': ref_no,
'ref_offset': ref_offset,
'disk_no': disk_no,
'disk_offset': offset
}
raw_matches.append(a)
logging.info("raw_matches.append(disk%02i@0x%011x <=> '%s'@0x%011x)"%(a['disk_no'], a['disk_offset'], a['ref_no'], a['ref_offset']))
state['raw_matches'] = len(raw_matches)
if offset % one_per_thousand == 0:
state['progress'] = state['progress'] + 0.1
agg = state['found']
state['state'] = 'aggregating'
# Blacklist ref_file sectors that is far too common in disk data
idx_matches = {}
for rm in raw_matches:
k = (rm['ref_no'], rm['ref_offset'])
if k in idx_matches:
idx_matches[k] += 1
else:
idx_matches[k] = 1
for k in idx_matches.keys():
if idx_matches[k] > 5:
logging.info("Skipping too many raw_matches for '%s'@0x%011x"%k)
logging.debug("Before filter : %i"%len(raw_matches))
raw_matches = filter(lambda rm: k != (rm['ref_no'], rm['ref_offset']), raw_matches)
logging.debug("After filter : %i"%len(raw_matches))
# Aggregate raw_matches
found = True
while found:
found = False
i = 0
rm_len = len(raw_matches)
while not found and i < rm_len:
x = raw_matches[i]
# Try to find an aggregated item that ends just before our ref_offset
if not found:
for a in agg:
if a['ref_no'] == x['ref_no'] and x['ref_offset'] == a['ref_offset_end']:
a['ref_offset_end'] = x['ref_offset'] + 512
b = a['block_list'].pop()
if b[0] == x['disk_no'] and b[2] == x['disk_offset']:
a['block_list'].append( (b[0], b[1], x['disk_offset'] + 512) )
else:
a['block_list'].append(b)
a['block_list'].append( (x['disk_no'], x['disk_offset'], x['disk_offset'] + 512) )
x['consumed'] = True
found = True
break
# Try to find an aggregated item that starts just after our ref_offset
if not found:
for a in agg:
if a['ref_no'] == x['ref_no'] and x['ref_offset'] + 512 == a['ref_offset_start']:
a['ref_offset_start'] = x['ref_offset']
a['block_list'].insert(0,(x['disk_no'], x['disk_offset']))
b = a['block_list'].pop(0)
if b[0] == x['disk_no'] and b[1] == x['disk_offset'] + 512:
b1[1] = x['disk_offset']
a['block_list'].insert(0, (b[0], x['disk_offset'], b[2]) )
else:
a['block_list'].append(b)
a['block_list'].append( (x['disk_no'], x['disk_offset'], x['disk_offset'] + 512) )
x['consumed'] = True
found = True
break
# Try to find another match right before or after the current one to create an aggregate
if not found:
for x2 in raw_matches:
if x2 != x and x2['ref_no'] == x['ref_no'] and abs(x2['ref_offset'] - x['ref_offset']) == 512:
if x2['ref_offset'] > x['ref_offset']:
first = x
last = x2
else:
first = x2
last = x
a = {
'ref_no': ref_no,
'ref_offset_start': first['ref_offset'],
'ref_offset_end': last['ref_offset'] + 512,
'block_list': [ (first['disk_no'], first['disk_offset'], last['disk_offset'] + 512) ]
}
logging.info('agg.append(%s)'%a)
agg.append(a)
x['consumed'] = True
x2['consumed'] = True
found = True
break
# Orphans are not injected in agg
i += 1
# end while ( x = raw_matches[i] )
# Remove all consumed items from raw_matches list before next While iteration
if found == True:
raw_matches = filter(lambda x: not 'consumed' in x, raw_matches)
state['raw_matches'] = len(raw_matches)
# end while not found
if len(agg) < 10000:
state['found'] = filter(lambda x: len(x['block_list']) > 1, agg)
state['state'] = 'searching'
else:
state['state'] = 'aborted'
raise Exception('Aborting after too many matches')
state['state'] = 'finished'
state['progress'] = 100.0
except Exception as e:
logging.exception(e)
finally:
ref_big_hash.clear()
logging.info("Exit. do_find_files()")
def do_find_bootsect(d,state):
logging.info("Enter do_find_bootsect()")
try:
state['state'] = 'initializing'
ref_sig = binascii.unhexlify('55AA')
ref_bootflags = ( binascii.unhexlify('00'), binascii.unhexlify('80') )
ref_parttypes = ( binascii.unhexlify('FB'), binascii.unhexlify('FC') )
start = 0
end = min(d.disks_size)
one_per_thousand = (end - start) / 1000
one_per_thousand = one_per_thousand + ( (-one_per_thousand)%512 )
logging.debug("start/end/1pc : %i / %i / %i"%(start,end,one_per_thousand))
state['found'] = []
state['progress'] = 0.0
state['state'] = 'searching'
for offset in xrange(start, end, 512):
for disk_no in range(d.disk_count):
d.disks[disk_no].seek(offset)
data = d.disks[disk_no].read(512)
if data[0x1fe:] == ref_sig: # Found magic 55AA
logging.debug("find_bootsect : found Magic at '%s'@0x%011x (%s)"%(disk_no,offset,binascii.hexlify(data[0x1be+0x0])))
if data[0x1be+0x0] in ref_bootflags: # Partition 1 : valid flags for bootable
logging.debug("find_bootsect : found correct part1 flag byte at '%s'@0x%011x"%(disk_no,offset))
# FIXME : make part type detection parametrable
if data[0x1be+0x4] in ref_parttypes: # Partition 1 : type VMWare
logging.debug("find_bootsect : found correct part1 type at '%s'@0x%011x"%(disk_no,offset))
f = state['found']
if len(f) < 200:
f.append((disk_no,offset))
state['found'] = f
else:
state['state'] = 'aborted'
raise Exception('Aborting after too many matches')
if offset % one_per_thousand == 0:
state['progress'] = state['progress'] + 0.1
state['progress'] = 100.0
state['state'] = 'finished'
except Exception as e:
logging.exception(e)
logging.info("Exit. do_find_bootsect()")
class MyTasks():
"""Auxiliary class, managing long or background tasks"""
TASK_NAMES = [ 'find_bootsect', 'find_files' ]
def __init__(self, mydisks):
self.tasks = []
self.d = mydisks
self.find_files_pathlist = []
m = multiprocessing.Manager()
self.find_bootsect_state = m.dict()
self.find_bootsect_process = None
self.find_files_state = m.dict()
self.find_files_process = None
def get_find_files_pathlist(self):
return self.find_files_pathlist
def get_find_files_pathlist_str(self):
return '\n'.join(self.find_files_pathlist)
def task_start(self, task_name):
if task_name == 'find_files':
self.find_files_state['filepaths'] = list(self.find_files_pathlist)
self.find_files_process = multiprocessing.Process(
target = do_find_files,
args = (self.d, self.find_files_state)
)
self.find_files_process.start()
elif task_name == 'find_bootsect':
self.find_bootsect_process = multiprocessing.Process(
target = do_find_bootsect,
args = (self.d, self.find_bootsect_state)
)
self.find_bootsect_process.start()
else:
raise ValueError('Valid task names are : %s'%','.join(MyTasks.TASK_NAMES))
def task_kill(self, task_name):
if task_name == 'find_bootsect':
if self.find_bootsect_process != None and self.find_bootsect_process.is_alive():
self.find_bootsect_process.terminate()
elif task_name == 'find_files':
if self.find_files_process != None and self.find_files_process.is_alive():
self.find_files_process.terminate()
else:
raise ValueError('Valid task names are : %s'%','.join(MyTasks.TASK_NAMES))
def append_find_files_pathlist(self, pathlist):
# TODO : should receive a list, make changes in raidguessfs.py
self.find_files_pathlist.extend(pathlist.split('\n'))
def set_find_files_pathlist(self, new_find_files_pathlist):
self.find_files_pathlist = new_find_files_pathlist
def read_find_bootsect(self):
if self.find_bootsect_process == None:
return 'This task has never been started\n'
else:
return '%s\n'%self.find_bootsect_state
def read_find_files(self):
if self.find_files_process == None:
return 'This task has never been started\n'
else:
return '%s\n'%self.find_files_state
|
