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https://github.com/volatilityfoundation/volatility3.git
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77 lines
3.2 KiB
Python
77 lines
3.2 KiB
Python
# This file was contributed to the Volatility Framework Version 3.
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# Copyright (C) 2018 Volatility Foundation.
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#
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# THE LICENSED WORK IS PROVIDED UNDER THE TERMS OF THE Volatility Contributors
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# Public License V1.0("LICENSE") AS FIRST COMPLETED BY: Volatility Foundation,
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# Inc. ANY USE, PUBLIC DISPLAY, PUBLIC PERFORMANCE, REPRODUCTION OR DISTRIBUTION
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# OF, OR PREPARATION OF SUBSEQUENT WORKS, DERIVATIVE WORKS OR DERIVED WORKS BASED
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# ON, THE LICENSED WORK CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS LICENSE AND ITS
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# TERMS, WHETHER OR NOT SUCH RECIPIENT READS THE TERMS OF THE LICENSE. "LICENSED
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# WORK,” “RECIPIENT" AND “DISTRIBUTOR" ARE DEFINED IN THE LICENSE. A COPY OF THE
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# LICENSE IS LOCATED IN THE TEXT FILE ENTITLED "LICENSE.txt" ACCOMPANYING THE
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# CONTENTS OF THIS FILE. IF A COPY OF THE LICENSE DOES NOT ACCOMPANY THIS FILE, A
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# COPY OF THE LICENSE MAY ALSO BE OBTAINED AT THE FOLLOWING WEB SITE:
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# https://www.volatilityfoundation.org/license/vcpl_v1.0
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
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# specific language governing rights and limitations under the License.
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#
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import re
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from typing import Generator, List, Tuple, Union
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from volatility.framework.interfaces import layers
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from volatility.framework.layers.scanners import multiregexp
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class BytesScanner(layers.ScannerInterface):
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thread_safe = True
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def __init__(self, needle: bytes) -> None:
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super().__init__()
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self.needle = needle
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def __call__(self, data: bytes, data_offset: int) -> Generator[int, None, None]:
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"""Runs through the data looking for the needle, and yields all offsets where the needle is found
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"""
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find_pos = data.find(self.needle)
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while find_pos >= 0:
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if find_pos < self.chunk_size:
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yield find_pos + data_offset
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find_pos = data.find(self.needle, find_pos + 1)
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class RegExScanner(layers.ScannerInterface):
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thread_safe = True
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def __init__(self, pattern: bytes, flags: int = 0) -> None:
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super().__init__()
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self.regex = re.compile(pattern, flags)
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def __call__(self, data: bytes, data_offset: int) -> Generator[int, None, None]:
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"""Runs through the data looking for the needle, and yields all offsets where the needle is found
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"""
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find_pos = self.regex.finditer(data)
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for match in find_pos:
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offset = match.start()
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if offset < self.chunk_size:
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yield offset + data_offset
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class MultiStringScanner(layers.ScannerInterface):
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thread_safe = True
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def __init__(self, patterns: List[bytes]) -> None:
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super().__init__()
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self._patterns = multiregexp.MultiRegexp()
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for pattern in patterns:
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self._patterns.add_pattern(pattern)
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self._patterns.preprocess()
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def __call__(self, data: bytes, data_offset: int) -> Generator[Tuple[int, Union[str, bytes]], None, None]:
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"""Runs through the data looking for the needles"""
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for offset, pattern in self._patterns.search(data):
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if offset < self.chunk_size:
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yield offset + data_offset, pattern
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