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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
/*
** tsk_fs_open_img
** The Sleuth Kit
**
** Brian Carrier [carrier <at> sleuthkit [dot] org]
** Copyright (c) 2006-2008 Brian Carrier, Basis Technology. All Rights reserved
** Copyright (c) 2003-2005 Brian Carrier. All rights reserved
**
** TASK
** Copyright (c) 2002 Brian Carrier, @stake Inc. All rights reserved
**
** Copyright (c) 1997,1998,1999, International Business Machines
** Corporation and others. All Rights Reserved.
*/
/* TCT */
/*++
* LICENSE
* This software is distributed under the IBM Public License.
* AUTHOR(S)
* Wietse Venema
* IBM T.J. Watson Research
* P.O. Box 704
* Yorktown Heights, NY 10598, USA
--*/
#include "tsk_fs_i.h"
/**
* \file fs_open.c
* Contains the general code to open a file system -- this calls
* the file system -specific opening routines.
*/
/**
* \ingroup fslib
* Tries to process data in a volume as a file system.
* Returns a structure that can be used for analysis and reporting.
*
* @param a_part_info Open volume to read from and analyze
* @param a_ftype Type of file system (or autodetect)
*
* @return NULL on error
*/
TSK_FS_INFO *
tsk_fs_open_vol(const TSK_VS_PART_INFO * a_part_info,
TSK_FS_TYPE_ENUM a_ftype)
{
TSK_OFF_T offset;
if (a_part_info == NULL) {
tsk_error_reset();
tsk_errno = TSK_ERR_FS_ARG;
snprintf(tsk_errstr, TSK_ERRSTR_L,
"tsk_fs_open_vol: Null vpart handle");
return NULL;
}
else if (a_part_info->vs == NULL) {
tsk_error_reset();
tsk_errno = TSK_ERR_FS_ARG;
snprintf(tsk_errstr, TSK_ERRSTR_L,
"tsk_fs_open_vol: Null vs handle");
return NULL;
}
offset =
a_part_info->start * a_part_info->vs->block_size +
a_part_info->vs->offset;
return tsk_fs_open_img(a_part_info->vs->img_info, offset, a_ftype);
}
/**
* \ingroup fslib
* Tries to process data in a disk image at a given offset as a file system.
* Returns a structure that can be used for analysis and reporting.
*
* @param a_img_info Disk image to analyze
* @param a_offset Byte offset to start analyzing from
* @param a_ftype Type of file system (or autodetect)
*
* @return NULL on error
*/
TSK_FS_INFO *
tsk_fs_open_img(TSK_IMG_INFO * a_img_info, TSK_OFF_T a_offset,
TSK_FS_TYPE_ENUM a_ftype)
{
if (a_img_info == NULL) {
tsk_error_reset();
tsk_errno = TSK_ERR_FS_ARG;
snprintf(tsk_errstr, TSK_ERRSTR_L,
"tsk_fs_open_img: Null image handle");
return NULL;
}
/* We will try different file systems ...
* We need to try all of them in case more than one matches
*/
if (a_ftype == TSK_FS_TYPE_DETECT) {
TSK_FS_INFO *fs_info, *fs_set = NULL;
char *set = NULL;
if (tsk_verbose)
tsk_fprintf(stderr,
"fsopen: Auto detection mode at offset %" PRIuOFF "\n",
a_offset);
if ((fs_info =
ntfs_open(a_img_info, a_offset, TSK_FS_TYPE_NTFS_DETECT,
1)) != NULL) {
set = "NTFS";
fs_set = fs_info;
}
else {
tsk_error_reset();
}
if ((fs_info =
fatfs_open(a_img_info, a_offset, TSK_FS_TYPE_FAT_DETECT,
1)) != NULL) {
if (set == NULL) {
set = "FAT";
fs_set = fs_info;
}
else {
fs_set->close(fs_set);
fs_info->close(fs_info);
tsk_error_reset();
tsk_errno = TSK_ERR_FS_UNKTYPE;
snprintf(tsk_errstr, TSK_ERRSTR_L, "FAT or %s", set);
return NULL;
}
}
else {
tsk_error_reset();
}
if ((fs_info =
ext2fs_open(a_img_info, a_offset, TSK_FS_TYPE_EXT_DETECT,
1)) != NULL) {
if (set == NULL) {
set = "EXT2/3";
fs_set = fs_info;
}
else {
fs_set->close(fs_set);
fs_info->close(fs_info);
tsk_error_reset();
tsk_errno = TSK_ERR_FS_UNKTYPE;
snprintf(tsk_errstr, TSK_ERRSTR_L, "EXT2/3 or %s", set);
return NULL;
}
}
else {
tsk_error_reset();
}
if ((fs_info =
ffs_open(a_img_info, a_offset,
TSK_FS_TYPE_FFS_DETECT)) != NULL) {
if (set == NULL) {
set = "UFS";
fs_set = fs_info;
}
else {
fs_set->close(fs_set);
fs_info->close(fs_info);
tsk_error_reset();
tsk_errno = TSK_ERR_FS_UNKTYPE;
snprintf(tsk_errstr, TSK_ERRSTR_L, "UFS or %s", set);
return NULL;
}
}
else {
tsk_error_reset();
}
#if TSK_USE_HFS
if ((fs_info =
hfs_open(a_img_info, a_offset, TSK_FS_TYPE_HFS_DETECT,
1)) != NULL) {
if (set == NULL) {
set = "HFS";
fs_set = fs_info;
}
else {
fs_set->close(fs_set);
fs_info->close(fs_info);
tsk_error_reset();
tsk_errno = TSK_ERR_FS_UNKTYPE;
snprintf(tsk_errstr, TSK_ERRSTR_L, "HFS or %s", set);
return NULL;
}
}
else {
tsk_error_reset();
}
#endif
if ((fs_info =
iso9660_open(a_img_info, a_offset,
TSK_FS_TYPE_ISO9660_DETECT, 1)) != NULL) {
if (set != NULL) {
fs_set->close(fs_set);
fs_info->close(fs_info);
tsk_error_reset();
tsk_errno = TSK_ERR_FS_UNKTYPE;
snprintf(tsk_errstr, TSK_ERRSTR_L, "ISO9660 or %s", set);
return NULL;
}
fs_set = fs_info;
}
else {
tsk_error_reset();
}
if (fs_set == NULL) {
tsk_error_reset();
tsk_errno = TSK_ERR_FS_UNKTYPE;
tsk_errstr[0] = '\0';
tsk_errstr2[0] = '\0';
return NULL;
}
return fs_set;
}
else {
if (TSK_FS_TYPE_ISNTFS(a_ftype))
return ntfs_open(a_img_info, a_offset, a_ftype, 0);
else if (TSK_FS_TYPE_ISFAT(a_ftype))
return fatfs_open(a_img_info, a_offset, a_ftype, 0);
else if (TSK_FS_TYPE_ISFFS(a_ftype))
return ffs_open(a_img_info, a_offset, a_ftype);
else if (TSK_FS_TYPE_ISEXT(a_ftype))
return ext2fs_open(a_img_info, a_offset, a_ftype, 0);
else if (TSK_FS_TYPE_ISHFS(a_ftype))
return hfs_open(a_img_info, a_offset, a_ftype, 0);
else if (TSK_FS_TYPE_ISISO9660(a_ftype))
return iso9660_open(a_img_info, a_offset, a_ftype, 0);
else if (TSK_FS_TYPE_ISRAW(a_ftype))
return rawfs_open(a_img_info, a_offset);
else if (TSK_FS_TYPE_ISSWAP(a_ftype))
return swapfs_open(a_img_info, a_offset);
else {
tsk_error_reset();
tsk_errno = TSK_ERR_FS_UNSUPTYPE;
snprintf(tsk_errstr, TSK_ERRSTR_L, "%X", (int) a_ftype);
return NULL;
}
}
}
/**
* \ingroup fslib
* Close an open file system.
* @param a_fs File system to close.
*/
void
tsk_fs_close(TSK_FS_INFO * a_fs)
{
if ((a_fs == NULL) || (a_fs->tag != TSK_FS_INFO_TAG))
return;
a_fs->close(a_fs);
}
|
