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40 lines
1.6 KiB
Python
40 lines
1.6 KiB
Python
# PROJECT: Python tools for traversing BTRFS structures
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# LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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# PURPOSE: Script for obtaining freeldr.sys from BTRFS disk image
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# COPYRIGHT: Copyright 2018 Victor Perevertkin (victor@perevertkin.ru)
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from btrfs_structures import *
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import crc32c
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fs = FileSystem('btrfs-big.bin', 0x7e00)
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fs.print_chunk_map()
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freeldr_dir_key = Key(256, DIR_ITEM_KEY, crc32c.name_hash('freeldr.sys')) # 256 - root dir objectid crc32c.name_hash('freeldr.sys')
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print(freeldr_dir_key)
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print('!!!!!!!!!!!!!!!!!!!! fs tree 1')
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fs_level, fs_root = fs.fs_root
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freeldr_dir_key, freeldr_dir_item = fs.search_tree(fs_level, fs_root, freeldr_dir_key)
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fs.search_tree(fs_level, fs_root, freeldr_dir_key, fs.print_node)
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freeldr_item, = (x for x in freeldr_dir_item if x.name.decode('utf-8') == 'freeldr.sys')
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freeldr_extent_data_key = Key(freeldr_item.location.objectid, EXTENT_DATA_KEY, 0)
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print('!!!!!!!!!!!!!!!!!!!! fs tree 2')
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freeldr_extent_data_key, freeldr_extent_data_item = fs.search_tree(fs_level, fs_root, freeldr_extent_data_key)
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fs.search_tree(fs_level, fs_root, freeldr_extent_data_key, fs.print_node)
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# # exploring extent tree
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print('!!!!!!!!!!!!!!!!!!!! extent tree')
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extent_level, extent_root = fs.extent_root
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exkey, extent_item = fs.search_tree(extent_level, extent_root, Key(freeldr_extent_data_item.disk_bytenr, EXTENT_ITEM_KEY, freeldr_extent_data_item.disk_num_bytes))
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print(freeldr_extent_data_item)
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fs.fd.seek(fs.logical_to_physical(extent_item.vaddr))
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freeldr = fs.fd.read(freeldr_extent_data_item.num_bytes)
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file = open("readed_freeldr.sys", "wb")
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file.write(freeldr)
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print(crc32c.name_hash('freeldr.sys'))
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