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107 lines
4.9 KiB
Python
107 lines
4.9 KiB
Python
# This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
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# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
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#
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import copy
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from typing import Any, Dict, Iterable, Optional, Type
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from volatility.framework import constants, interfaces, objects
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class NativeTable(interfaces.symbols.NativeTableInterface):
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"""Symbol List that handles Native types."""
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# FIXME: typing the native_dictionary as Tuple[interfaces.objects.ObjectInterface, str] throws many errors
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def __init__(self, name: str, native_dictionary: Dict[str, Any]) -> None:
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super().__init__(name, self)
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self._native_dictionary = copy.deepcopy(native_dictionary)
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self._overrides = {} # type: Dict[str, interfaces.objects.ObjectInterface]
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for native_type in self._native_dictionary:
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native_class, _native_struct = self._native_dictionary[native_type]
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self._overrides[native_type] = native_class
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# Create this once early, because it may get used a lot
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self._types = set(self._native_dictionary).union(
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{'enum', 'array', 'bitfield', 'void', 'string', 'bytes', 'function'})
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def get_type_class(self, name: str) -> Type[interfaces.objects.ObjectInterface]:
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ntype, _ = self._native_dictionary.get(name, (objects.Integer, None))
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return ntype
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@property
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def types(self) -> Iterable[str]:
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"""Returns an iterator of the symbol type names."""
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return self._types
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def get_type(self, type_name: str) -> interfaces.objects.Template:
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"""Resolves a symbol name into an object template.
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This always construct a new python object, rather than using a
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cached value otherwise changes made later may affect the cached
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copy. Calling clone after every native type construction was
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extremely slow.
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"""
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# NOTE: These need updating whenever the object init signatures change
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prefix = ""
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if constants.BANG in type_name:
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name_split = type_name.split(constants.BANG)
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if len(name_split) > 2:
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raise ValueError("SymbolName cannot contain multiple {} separators".format(constants.BANG))
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table_name, type_name = name_split
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prefix = table_name + constants.BANG
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additional = {} # type: Dict[str, Any]
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obj = None # type: Optional[Type[interfaces.objects.ObjectInterface]]
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if type_name == 'void' or type_name == 'function':
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obj = objects.Void
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elif type_name == 'array':
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obj = objects.Array
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additional = {"count": 0, "subtype": self.get_type('void')}
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elif type_name == 'enum':
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obj = objects.Enumeration
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additional = {"base_type": self.get_type('void'), "choices": {}}
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elif type_name == 'bitfield':
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obj = objects.BitField
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additional = {"start_bit": 0, "end_bit": 0, "base_type": self.get_type('void')}
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elif type_name == 'string':
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obj = objects.String
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additional = {"max_length": 0}
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elif type_name == 'bytes':
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obj = objects.Bytes
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additional = {"length": 0}
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if obj is not None:
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return objects.templates.ObjectTemplate(obj, type_name = prefix + type_name, **additional)
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_native_type, native_format = self._native_dictionary[type_name]
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if type_name == 'pointer':
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additional = {'subtype': self.get_type('void')}
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return objects.templates.ObjectTemplate(
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self.get_type_class(type_name), # pylint: disable=W0142
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type_name = prefix + type_name,
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data_format = objects.DataFormatInfo(*native_format),
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**additional)
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std_ctypes = {
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'int': (objects.Integer, (4, "little", True)),
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'long': (objects.Integer, (4, "little", True)),
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'unsigned long': (objects.Integer, (4, "little", False)),
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'unsigned int': (objects.Integer, (4, "little", False)),
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'char': (objects.Integer, (1, "little", True)),
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'byte': (objects.Bytes, (1, "little", True)),
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'unsigned char': (objects.Integer, (1, "little", False)),
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'unsigned short int': (objects.Integer, (2, "little", False)),
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'unsigned short': (objects.Integer, (2, "little", False)),
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'unsigned be short': (objects.Integer, (2, "big", False)),
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'short': (objects.Integer, (2, "little", True)),
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'long long': (objects.Integer, (8, "little", True)),
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'unsigned long long': (objects.Integer, (8, "little", True)),
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'float': (objects.Float, (4, "little", True)),
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'double': (objects.Float, (8, "little", True)),
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'wchar': (objects.Integer, (2, "little", False))
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}
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native_types = std_ctypes.copy()
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native_types['pointer'] = (objects.Pointer, (4, "little", False))
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x86NativeTable = NativeTable("native", native_types)
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native_types['pointer'] = (objects.Pointer, (8, "little", False))
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x64NativeTable = NativeTable("native", native_types)
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