1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
# Volatools Basic
# Copyright (C) 2007 Komoku, Inc.
#
# This program 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 2 of the License, or (at
# your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# pylint: disable=invalid-name,missing-docstring
"""
@author: AAron Walters and Nick Petroni
@license: GNU General Public License 2.0 or later
@contact: awalters@komoku.com, npetroni@komoku.com
@organization: Komoku, Inc.
"""
import struct
builtin_types = {
'int': (4, 'i'),
'long': (4, 'i'),
'unsigned long': (4, 'I'),
'unsigned int': (4, 'I'),
'address': (4, 'I'),
'char': (1, 'c'),
'unsigned char': (1, 'B'),
'unsigned short': (2, 'H'),
'short': (2, 'h'),
'long long': (8, 'q'),
'unsigned long long': (8, 'Q'),
'pointer': (4, 'I'),
}
def obj_size(types, objname):
if objname not in types:
raise Exception('Invalid type %s not in types' % (objname))
return types[objname][0]
def builtin_size(builtin):
if builtin not in builtin_types:
raise Exception('Invalid built-in type %s' % (builtin))
return builtin_types[builtin][0]
def read_value(addr_space, value_type, vaddr):
"""
Read the low-level value for a built-in type.
"""
if value_type not in builtin_types:
raise Exception('Invalid built-in type %s' % (value_type))
type_unpack_char = builtin_types[value_type][1]
type_size = builtin_types[value_type][0]
buf = addr_space.read(vaddr, type_size)
if buf is None:
return None
(val,) = struct.unpack(type_unpack_char, buf)
return val
def read_unicode_string(addr_space, types, member_list, vaddr):
offset = 0
if len(member_list) > 1:
(offset, __) = get_obj_offset(types, member_list)
buf = read_obj(addr_space, types, ['_UNICODE_STRING', 'Buffer'], vaddr + offset)
length = read_obj(addr_space, types, ['_UNICODE_STRING', 'Length'], vaddr + offset)
if length == 0x0:
return ""
if buf is None or length is None:
return None
readBuf = read_string(addr_space, types, ['char'], buf, length)
if readBuf is None:
return None
try:
readBuf = readBuf.decode('UTF-16').encode('ascii')
except Exception: # pylint: disable=broad-except
return None
return readBuf
def read_string(addr_space, types, member_list, vaddr, max_length=256):
offset = 0
if len(member_list) > 1:
(offset, __) = get_obj_offset(types, member_list)
val = addr_space.read(vaddr + offset, max_length)
return val
def read_null_string(addr_space, types, member_list, vaddr, max_length=256):
string = read_string(addr_space, types, member_list, vaddr, max_length)
if string is None:
return None
return string.split('\0', 1)[0]
def get_obj_offset(types, member_list):
"""
Returns the (offset, type) pair for a given list
"""
member_list.reverse()
current_type = member_list.pop()
offset = 0
while member_list:
if current_type == 'array':
current_type = member_dict[current_member][1][2][0]
if current_type in builtin_types:
current_type_size = builtin_size(current_type)
else:
current_type_size = obj_size(types, current_type)
index = member_list.pop()
offset += index * current_type_size
continue
elif current_type not in types:
raise Exception('Invalid type ' + current_type)
member_dict = types[current_type][1]
current_member = member_list.pop()
if current_member not in member_dict:
raise Exception('Invalid member %s in type %s' % (current_member, current_type))
offset += member_dict[current_member][0]
current_type = member_dict[current_member][1][0]
return (offset, current_type)
def read_obj(addr_space, types, member_list, vaddr):
"""
Read the low-level value for some complex type's member.
The type must have members.
"""
if len(member_list) < 2:
raise Exception('Invalid type/member ' + str(member_list))
(offset, current_type) = get_obj_offset(types, member_list)
return read_value(addr_space, current_type, vaddr + offset)
|
