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
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
|
/*
* Copyright (C) 1999 by Andries Brouwer
* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
* Copyright (C) 2001 by Andreas Dilger
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* Inspired also by libvolume_id by
* Kay Sievers <kay.sievers@vrfy.org>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include <ctype.h>
#include "superblocks.h"
#include "cctype.h"
#include "iso9660.h"
struct hs_date {
unsigned char year[4];
unsigned char month[2];
unsigned char day[2];
unsigned char hour[2];
unsigned char minute[2];
unsigned char second[2];
unsigned char hundredth[2];
} __attribute__ ((packed));
struct iso9660_date {
struct hs_date common;
unsigned char offset;
} __attribute__ ((packed));
/* PVD - Primary volume descriptor */
struct iso_volume_descriptor {
/* High Sierra has 8 bytes before descriptor with Volume Descriptor LBN value, those are skipped by blkid_probe_get_buffer() */
unsigned char vd_type;
unsigned char vd_id[5];
unsigned char vd_version;
unsigned char flags;
unsigned char system_id[32];
unsigned char volume_id[32];
unsigned char unused[8];
unsigned char space_size[8];
unsigned char escape_sequences[32];
unsigned char set_size[4];
unsigned char vol_seq_num[4];
unsigned char logical_block_size[4];
unsigned char path_table_size[8];
union {
struct {
unsigned char type_l_path_table[4];
unsigned char opt_type_l_path_table[4];
unsigned char type_m_path_table[4];
unsigned char opt_type_m_path_table[4];
unsigned char root_dir_record[34];
unsigned char volume_set_id[128];
unsigned char publisher_id[128];
unsigned char data_preparer_id[128];
unsigned char application_id[128];
unsigned char copyright_file_id[37];
unsigned char abstract_file_id[37];
unsigned char bibliographic_file_id[37];
struct iso9660_date created;
struct iso9660_date modified;
struct iso9660_date expiration;
struct iso9660_date effective;
unsigned char std_version;
} iso; /* ISO9660 */
struct {
unsigned char type_l_path_table[4];
unsigned char opt1_type_l_path_table[4];
unsigned char opt2_type_l_path_table[4];
unsigned char opt3_type_l_path_table[4];
unsigned char type_m_path_table[4];
unsigned char opt1_type_m_path_table[4];
unsigned char opt2_type_m_path_table[4];
unsigned char opt3_type_m_path_table[4];
unsigned char root_dir_record[34];
unsigned char volume_set_id[128];
unsigned char publisher_id[128];
unsigned char data_preparer_id[128];
unsigned char application_id[128];
unsigned char copyright_file_id[32];
unsigned char abstract_file_id[32];
struct hs_date created;
struct hs_date modified;
struct hs_date expiration;
struct hs_date effective;
unsigned char std_version;
} hs; /* High Sierra */
};
} __attribute__((packed));
/* Boot Record */
struct boot_record {
/* High Sierra has 8 bytes before descriptor with Volume Descriptor LBN value, those are skipped by blkid_probe_get_buffer() */
unsigned char vd_type;
unsigned char vd_id[5];
unsigned char vd_version;
unsigned char boot_system_id[32];
unsigned char boot_id[32];
unsigned char unused[1];
} __attribute__((packed));
#define ISO_SUPERBLOCK_OFFSET 0x8000
#define ISO_SECTOR_SIZE 0x800
#define ISO_VD_BOOT_RECORD 0x0
#define ISO_VD_PRIMARY 0x1
#define ISO_VD_SUPPLEMENTARY 0x2
#define ISO_VD_END 0xff
#define ISO_VD_MAX 16
/* maximal string field size used anywhere in ISO; update if necessary */
#define ISO_MAX_FIELDSIZ sizeof_member(struct iso_volume_descriptor, iso.volume_set_id)
static int probe_iso9660_set_uuid (blkid_probe pr, const struct hs_date *date, unsigned char offset)
{
unsigned char buffer[16];
unsigned int i, zeros = 0;
buffer[0] = date->year[0];
buffer[1] = date->year[1];
buffer[2] = date->year[2];
buffer[3] = date->year[3];
buffer[4] = date->month[0];
buffer[5] = date->month[1];
buffer[6] = date->day[0];
buffer[7] = date->day[1];
buffer[8] = date->hour[0];
buffer[9] = date->hour[1];
buffer[10] = date->minute[0];
buffer[11] = date->minute[1];
buffer[12] = date->second[0];
buffer[13] = date->second[1];
buffer[14] = date->hundredth[0];
buffer[15] = date->hundredth[1];
/* count the number of zeros ('0') in the date buffer */
for (i = 0, zeros = 0; i < sizeof(buffer); i++)
if (buffer[i] == '0')
zeros++;
/* due to the iso9660 standard if all date fields are '0' and offset is 0, the date is unset */
if (zeros == sizeof(buffer) && offset == 0)
return 0;
/* generate an UUID using this date and return success */
blkid_probe_sprintf_uuid (pr, buffer, sizeof(buffer),
"%c%c%c%c-%c%c-%c%c-%c%c-%c%c-%c%c-%c%c",
buffer[0], buffer[1], buffer[2], buffer[3],
buffer[4], buffer[5],
buffer[6], buffer[7],
buffer[8], buffer[9],
buffer[10], buffer[11],
buffer[12], buffer[13],
buffer[14], buffer[15]);
return 1;
}
static int is_str_empty(const unsigned char *str, size_t len)
{
size_t i;
if (!str || !*str)
return 1;
for (i = 0; i < len; i++)
if (!isspace(str[i]))
return 0;
return 1;
}
static int is_utf16be_str_empty(unsigned char *utf16, size_t len)
{
size_t i;
for (i = 0; i < len; i += 2) {
if (utf16[i] != 0x0 || !isspace(utf16[i + 1]))
return 0;
}
return 1;
}
/* if @utf16 is prefix of @ascii (ignoring non-representable characters and upper-case conversion)
* then reconstruct prefix from @utf16 and @ascii, append suffix from @ascii, fill it into @out
* and returns length of bytes written into @out; otherwise returns zero */
static size_t merge_utf16be_ascii(unsigned char *out, size_t out_len, const unsigned char *utf16, const unsigned char *ascii, size_t len)
{
size_t o, a, u;
for (o = 0, a = 0, u = 0; u + 1 < len && a < len && o + 1 < out_len; o += 2, a++, u += 2) {
/* Surrogate pair with code point above U+FFFF */
if (utf16[u] >= 0xD8 && utf16[u] <= 0xDB && u + 3 < len &&
utf16[u + 2] >= 0xDC && utf16[u + 2] <= 0xDF) {
out[o++] = utf16[u++];
out[o++] = utf16[u++];
}
/* Value '_' is replacement for non-representable character */
if (ascii[a] == '_') {
out[o] = utf16[u];
out[o + 1] = utf16[u + 1];
} else if (utf16[u] == 0x00 && utf16[u + 1] == '_') {
out[o] = 0x00;
out[o + 1] = ascii[a];
} else if (utf16[u] == 0x00 && c_toupper(ascii[a]) == c_toupper(utf16[u + 1])) {
out[o] = 0x00;
out[o + 1] = c_isupper(ascii[a]) ? utf16[u + 1] : ascii[a];
} else {
return 0;
}
}
for (; a < len && o + 1 < out_len; o += 2, a++) {
out[o] = 0x00;
out[o + 1] = ascii[a];
}
return o;
}
/* iso9660 [+ Microsoft Joliet Extension] */
static int probe_iso9660(blkid_probe pr, const struct blkid_idmag *mag)
{
struct boot_record *boot = NULL;
struct iso_volume_descriptor *pvd = NULL;
struct iso_volume_descriptor *joliet = NULL;
/* space for merge_utf16be_ascii(ISO_ID_BUFSIZ bytes) */
unsigned char buf[ISO_MAX_FIELDSIZ * 5 / 2];
const struct hs_date *modified;
const struct hs_date *created;
unsigned char modified_offset;
unsigned char created_offset;
size_t len;
int is_hs;
int is_unicode_empty;
int is_ascii_hs_empty;
int is_ascii_iso_empty;
int i;
uint64_t off;
if (blkid_probe_get_hint(pr, mag->hoff, &off) < 0)
off = 0;
if (off % ISO_SECTOR_SIZE)
return 1;
is_hs = (strcmp(mag->magic, "CDROM") == 0);
for (i = 0, off += ISO_SUPERBLOCK_OFFSET; i < ISO_VD_MAX && (!boot || !pvd || (!is_hs && !joliet)); i++, off += ISO_SECTOR_SIZE) {
const unsigned char *desc =
blkid_probe_get_buffer(pr,
off + (is_hs ? 8 : 0), /* High Sierra has 8 bytes before descriptor with Volume Descriptor LBN value */
max(sizeof(struct boot_record),
sizeof(struct iso_volume_descriptor)));
if (desc == NULL || desc[0] == ISO_VD_END)
break;
else if (!boot && desc[0] == ISO_VD_BOOT_RECORD)
boot = (struct boot_record *)desc;
else if (!pvd && desc[0] == ISO_VD_PRIMARY)
pvd = (struct iso_volume_descriptor *)desc;
else if (!is_hs && !joliet && desc[0] == ISO_VD_SUPPLEMENTARY) {
joliet = (struct iso_volume_descriptor *)desc;
if (memcmp(joliet->escape_sequences, "%/@", 3) != 0 &&
memcmp(joliet->escape_sequences, "%/C", 3) != 0 &&
memcmp(joliet->escape_sequences, "%/E", 3) != 0)
joliet = NULL;
}
}
if (!pvd)
return errno ? -errno : 1;
uint16_t logical_block_size = isonum_723(pvd->logical_block_size, false);
uint32_t space_size = isonum_733(pvd->space_size, false);
blkid_probe_set_fsblocksize(pr, logical_block_size);
blkid_probe_set_block_size(pr, logical_block_size);
blkid_probe_set_fssize(pr, (uint64_t) space_size * logical_block_size);
if (joliet && (len = merge_utf16be_ascii(buf, sizeof(buf), joliet->system_id, pvd->system_id, sizeof(pvd->system_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "SYSTEM_ID", buf, len, UL_ENCODE_UTF16BE);
else if (joliet)
blkid_probe_set_utf8_id_label(pr, "SYSTEM_ID", joliet->system_id, sizeof(joliet->system_id), UL_ENCODE_UTF16BE);
else
blkid_probe_set_id_label(pr, "SYSTEM_ID", pvd->system_id, sizeof(pvd->system_id));
if (joliet && (len = merge_utf16be_ascii(buf, sizeof(buf), joliet->iso.volume_set_id, pvd->iso.volume_set_id, sizeof(pvd->iso.volume_set_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "VOLUME_SET_ID", buf, len, UL_ENCODE_UTF16BE);
else if (joliet)
blkid_probe_set_utf8_id_label(pr, "VOLUME_SET_ID", joliet->iso.volume_set_id, sizeof(joliet->iso.volume_set_id), UL_ENCODE_UTF16BE);
else if (is_hs)
blkid_probe_set_id_label(pr, "VOLUME_SET_ID", pvd->hs.volume_set_id, sizeof(pvd->hs.volume_set_id));
else
blkid_probe_set_id_label(pr, "VOLUME_SET_ID", pvd->iso.volume_set_id, sizeof(pvd->iso.volume_set_id));
is_ascii_hs_empty = (!is_hs || is_str_empty(pvd->hs.publisher_id, sizeof(pvd->hs.publisher_id)) || pvd->hs.publisher_id[0] == '_');
is_ascii_iso_empty = (is_hs || is_str_empty(pvd->iso.publisher_id, sizeof(pvd->iso.publisher_id)) || pvd->iso.publisher_id[0] == '_');
is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->iso.publisher_id, sizeof(joliet->iso.publisher_id)) || (joliet->iso.publisher_id[0] == 0x00 && joliet->iso.publisher_id[1] == '_'));
if (!is_unicode_empty && !is_ascii_iso_empty && (len = merge_utf16be_ascii(buf, sizeof(buf), joliet->iso.publisher_id, pvd->iso.publisher_id, sizeof(pvd->iso.publisher_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "PUBLISHER_ID", buf, len, UL_ENCODE_UTF16BE);
else if (!is_unicode_empty)
blkid_probe_set_utf8_id_label(pr, "PUBLISHER_ID", joliet->iso.publisher_id, sizeof(joliet->iso.publisher_id), UL_ENCODE_UTF16BE);
else if (!is_ascii_hs_empty)
blkid_probe_set_id_label(pr, "PUBLISHER_ID", pvd->hs.publisher_id, sizeof(pvd->hs.publisher_id));
else if (!is_ascii_iso_empty)
blkid_probe_set_id_label(pr, "PUBLISHER_ID", pvd->iso.publisher_id, sizeof(pvd->iso.publisher_id));
is_ascii_hs_empty = (!is_hs || is_str_empty(pvd->hs.data_preparer_id, sizeof(pvd->hs.data_preparer_id)) || pvd->hs.data_preparer_id[0] == '_');
is_ascii_iso_empty = (is_hs || is_str_empty(pvd->iso.data_preparer_id, sizeof(pvd->iso.data_preparer_id)) || pvd->iso.data_preparer_id[0] == '_');
is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->iso.data_preparer_id, sizeof(joliet->iso.data_preparer_id)) || (joliet->iso.data_preparer_id[0] == 0x00 && joliet->iso.data_preparer_id[1] == '_'));
if (!is_unicode_empty && !is_ascii_iso_empty && (len = merge_utf16be_ascii(buf, sizeof(buf), joliet->iso.data_preparer_id, pvd->iso.data_preparer_id, sizeof(pvd->iso.data_preparer_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "DATA_PREPARER_ID", buf, len, UL_ENCODE_UTF16BE);
else if (!is_unicode_empty)
blkid_probe_set_utf8_id_label(pr, "DATA_PREPARER_ID", joliet->iso.data_preparer_id, sizeof(joliet->iso.data_preparer_id), UL_ENCODE_UTF16BE);
else if (!is_ascii_hs_empty)
blkid_probe_set_id_label(pr, "DATA_PREPARER_ID", pvd->hs.data_preparer_id, sizeof(pvd->hs.data_preparer_id));
else if (!is_ascii_iso_empty)
blkid_probe_set_id_label(pr, "DATA_PREPARER_ID", pvd->iso.data_preparer_id, sizeof(pvd->iso.data_preparer_id));
is_ascii_hs_empty = (!is_hs || is_str_empty(pvd->hs.application_id, sizeof(pvd->hs.application_id)) || pvd->hs.application_id[0] == '_');
is_ascii_iso_empty = (is_hs || is_str_empty(pvd->iso.application_id, sizeof(pvd->iso.application_id)) || pvd->iso.application_id[0] == '_');
is_unicode_empty = (!joliet || is_utf16be_str_empty(joliet->iso.application_id, sizeof(joliet->iso.application_id)) || (joliet->iso.application_id[0] == 0x00 && joliet->iso.application_id[1] == '_'));
if (!is_unicode_empty && !is_ascii_iso_empty && (len = merge_utf16be_ascii(buf, sizeof(buf), joliet->iso.application_id, pvd->iso.application_id, sizeof(pvd->iso.application_id))) != 0)
blkid_probe_set_utf8_id_label(pr, "APPLICATION_ID", buf, len, UL_ENCODE_UTF16BE);
else if (!is_unicode_empty)
blkid_probe_set_utf8_id_label(pr, "APPLICATION_ID", joliet->iso.application_id, sizeof(joliet->iso.application_id), UL_ENCODE_UTF16BE);
else if (!is_ascii_hs_empty)
blkid_probe_set_id_label(pr, "APPLICATION_ID", pvd->hs.application_id, sizeof(pvd->hs.application_id));
else if (!is_ascii_iso_empty)
blkid_probe_set_id_label(pr, "APPLICATION_ID", pvd->iso.application_id, sizeof(pvd->iso.application_id));
if (is_hs) {
modified = &pvd->hs.modified;
created = &pvd->hs.created;
modified_offset = 0;
created_offset = 0;
} else {
modified = &pvd->iso.modified.common;
created = &pvd->iso.created.common;
modified_offset = pvd->iso.modified.offset;
created_offset = pvd->iso.created.offset;
}
/* create an UUID using the modified/created date */
if (! probe_iso9660_set_uuid(pr, modified, modified_offset))
probe_iso9660_set_uuid(pr, created, created_offset);
if (boot)
blkid_probe_set_id_label(pr, "BOOT_SYSTEM_ID",
boot->boot_system_id,
sizeof(boot->boot_system_id));
if (joliet)
blkid_probe_set_version(pr, "Joliet Extension");
else if (is_hs)
blkid_probe_set_version(pr, "High Sierra");
/* Label in Joliet is UNICODE (UTF16BE) but can contain only 16 characters. Label in PVD is
* subset of ASCII but can contain up to the 32 characters. Non-representable characters are
* stored as replacement character '_'. Label in Joliet is in most cases trimmed but UNICODE
* version of label in PVD. Based on these facts try to reconstruct original label if label
* in Joliet is prefix of the label in PVD (ignoring non-representable characters).
*/
if (joliet && (len = merge_utf16be_ascii(buf, sizeof(buf), joliet->volume_id, pvd->volume_id, sizeof(pvd->volume_id))) != 0)
blkid_probe_set_utf8label(pr, buf, len, UL_ENCODE_UTF16BE);
else if (joliet)
blkid_probe_set_utf8label(pr, joliet->volume_id, sizeof(joliet->volume_id), UL_ENCODE_UTF16BE);
else
blkid_probe_set_label(pr, pvd->volume_id, sizeof(pvd->volume_id));
return 0;
}
const struct blkid_idinfo iso9660_idinfo =
{
.name = "iso9660",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_iso9660,
.flags = BLKID_IDINFO_TOLERANT,
.magics =
{
/*
* Due to different location of vd_id[] in ISO9660 and High Sierra, IS9660 can match
* also High Sierra vd_id[]. So always check ISO9660 (CD001) before High Sierra (CDROM).
*/
{ .magic = "CD001", .len = 5, .kboff = 32, .sboff = 1, .hoff = "session_offset" },
{ .magic = "CDROM", .len = 5, .kboff = 32, .sboff = 9, .hoff = "session_offset" },
{ NULL }
}
};
|
