51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
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import io
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from .matcher import SignatureMatcher, Match
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class SquashFS(SignatureMatcher):
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"""
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Finding a Squash file system
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https://dr-emann.github.io/squashfs/
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superblock
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-> compression options
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-> data blocks & fragments
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-> inode table
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-> directory table
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-> fragment table
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-> export table
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-> uid/gid lookup table
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-> xattr table
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"""
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def __init__(self, file):
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self.name = "SquashFS"
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self.signature = b'hsqs'
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super().__init__(file)
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def is_valid(self):
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for match in self.search():
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start = match
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header = io.BytesIO(self.file[start:start+ 4*5 + 2*6 + 8*8])
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magic = header.read(4)
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inode = header.read(4)
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modification_time = header.read(4)
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block_size = header.read(4)
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fragment_entry_count = header.read(4)
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compression_id = header.read(2)
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block_log = header.read(2)
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flags = header.read(2)
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id_count = header.read(2)
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version_major = header.read(2)
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version_minor = header.read(2)
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root_inode_ref = header.read(8)
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bytes_used = header.read(8)
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id_table_start = header.read(8)
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xattr_id_table_start = header.read(8)
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inode_table_start = header.read(8)
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directory_table_start = header.read(8)
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fragment_table_start = header.read(8)
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export_table_start = header.read(8)
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# size how to get?
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self.matches += [Match(start, 0)]
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return len(self.matches) != 0
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