1 /*
2 * probe.c - identify a block device by its contents, and return a dev
3 * struct with the details
4 *
5 * Copyright (C) 1999 by Andries Brouwer
6 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
7 * Copyright (C) 2001 by Andreas Dilger
8 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
9 *
10 * %Begin-Header%
11 * This file may be redistributed under the terms of the
12 * GNU Lesser General Public License.
13 * %End-Header%
14 */
15
16 #include <stdio.h>
17 #include <string.h>
18 #include <stdlib.h>
19 #include <unistd.h>
20 #include <fcntl.h>
21 #include <ctype.h>
22 #include <sys/types.h>
23 #ifdef HAVE_SYS_STAT_H
24 #include <sys/stat.h>
25 #endif
26 #ifdef HAVE_SYS_MKDEV_H
27 #include <sys/mkdev.h>
28 #endif
29 #ifdef __linux__
30 #include <sys/utsname.h>
31 #endif
32 #ifdef HAVE_ERRNO_H
33 #include <errno.h>
34 #endif
35 #include "blkidP.h"
36 #include "uuid/uuid.h"
37 #include "probe.h"
38
figure_label_len(const unsigned char * label,int len)39 static int figure_label_len(const unsigned char *label, int len)
40 {
41 const unsigned char *end = label + len - 1;
42
43 while ((*end == ' ' || *end == 0) && end >= label)
44 --end;
45 if (end >= label)
46 return end - label + 1;
47 return 0;
48 }
49
get_buffer(struct blkid_probe * pr,blkid_loff_t off,size_t len)50 static unsigned char *get_buffer(struct blkid_probe *pr,
51 blkid_loff_t off, size_t len)
52 {
53 ssize_t ret_read;
54 unsigned char *newbuf;
55
56 if (off + len <= SB_BUFFER_SIZE) {
57 if (!pr->sbbuf) {
58 pr->sbbuf = malloc(SB_BUFFER_SIZE);
59 if (!pr->sbbuf)
60 return NULL;
61 if (lseek(pr->fd, 0, SEEK_SET) < 0)
62 return NULL;
63 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE);
64 if (ret_read < 0)
65 ret_read = 0;
66 pr->sb_valid = ret_read;
67 }
68 if (off+len > pr->sb_valid)
69 return NULL;
70 return pr->sbbuf + off;
71 } else {
72 if (len > pr->buf_max) {
73 newbuf = realloc(pr->buf, len);
74 if (newbuf == NULL)
75 return NULL;
76 pr->buf = newbuf;
77 pr->buf_max = len;
78 }
79 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0)
80 return NULL;
81 ret_read = read(pr->fd, pr->buf, len);
82 if (ret_read != (ssize_t) len)
83 return NULL;
84 return pr->buf;
85 }
86 }
87
88
89 /*
90 * This is a special case code to check for an MDRAID device. We do
91 * this special since it requires checking for a superblock at the end
92 * of the device.
93 */
check_mdraid(int fd,unsigned char * ret_uuid)94 static int check_mdraid(int fd, unsigned char *ret_uuid)
95 {
96 struct mdp_superblock_s *md;
97 blkid_loff_t offset;
98 char buf[4096];
99
100 if (fd < 0)
101 return -BLKID_ERR_PARAM;
102
103 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
104
105 if (blkid_llseek(fd, offset, 0) < 0 ||
106 read(fd, buf, 4096) != 4096)
107 return -BLKID_ERR_IO;
108
109 /* Check for magic number */
110 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4))
111 return -BLKID_ERR_PARAM;
112
113 if (!ret_uuid)
114 return 0;
115 *ret_uuid = 0;
116
117 /* The MD UUID is not contiguous in the superblock, make it so */
118 md = (struct mdp_superblock_s *)buf;
119 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
120 memcpy(ret_uuid, &md->set_uuid0, 4);
121 memcpy(ret_uuid + 4, &md->set_uuid1, 12);
122 }
123 return 0;
124 }
125
set_uuid(blkid_dev dev,uuid_t uuid,const char * tag)126 static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag)
127 {
128 char str[37];
129
130 if (!uuid_is_null(uuid)) {
131 uuid_unparse(uuid, str);
132 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str));
133 }
134 }
135
get_ext2_info(blkid_dev dev,struct blkid_magic * id,unsigned char * buf)136 static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
137 unsigned char *buf)
138 {
139 struct ext2_super_block *es = (struct ext2_super_block *) buf;
140 const char *label = 0;
141
142 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
143 blkid_le32(es->s_feature_compat),
144 blkid_le32(es->s_feature_incompat),
145 blkid_le32(es->s_feature_ro_compat)));
146
147 if (strlen(es->s_volume_name))
148 label = es->s_volume_name;
149 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
150
151 set_uuid(dev, es->s_uuid, 0);
152
153 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
154 !uuid_is_null(es->s_journal_uuid))
155 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");
156
157 if (strcmp(id->bim_type, "ext2") &&
158 ((blkid_le32(es->s_feature_incompat) &
159 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
160 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
161 }
162
163 /*
164 * Check to see if a filesystem is in /proc/filesystems.
165 * Returns 1 if found, 0 if not
166 */
fs_proc_check(const char * fs_name)167 static int fs_proc_check(const char *fs_name)
168 {
169 FILE *f;
170 char buf[80], *cp, *t;
171
172 f = fopen("/proc/filesystems", "r");
173 if (!f)
174 return (0);
175 while (!feof(f)) {
176 if (!fgets(buf, sizeof(buf), f))
177 break;
178 cp = buf;
179 if (!isspace(*cp)) {
180 while (*cp && !isspace(*cp))
181 cp++;
182 }
183 while (*cp && isspace(*cp))
184 cp++;
185 if ((t = strchr(cp, '\n')) != NULL)
186 *t = 0;
187 if ((t = strchr(cp, '\t')) != NULL)
188 *t = 0;
189 if ((t = strchr(cp, ' ')) != NULL)
190 *t = 0;
191 if (!strcmp(fs_name, cp)) {
192 fclose(f);
193 return (1);
194 }
195 }
196 fclose(f);
197 return (0);
198 }
199
200 /*
201 * Check to see if a filesystem is available as a module
202 * Returns 1 if found, 0 if not
203 */
check_for_modules(const char * fs_name)204 static int check_for_modules(const char *fs_name)
205 {
206 #ifdef __linux__
207 struct utsname uts;
208 FILE *f;
209 char buf[1024], *cp;
210 int namesz;
211
212 if (uname(&uts))
213 return (0);
214 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
215
216 f = fopen(buf, "r");
217 if (!f)
218 return (0);
219
220 namesz = strlen(fs_name);
221
222 while (!feof(f)) {
223 if (!fgets(buf, sizeof(buf), f))
224 break;
225 if ((cp = strchr(buf, ':')) != NULL)
226 *cp = 0;
227 else
228 continue;
229 if ((cp = strrchr(buf, '/')) != NULL)
230 cp++;
231 else
232 cp = buf;
233 if (!strncmp(cp, fs_name, namesz) &&
234 (!strcmp(cp + namesz, ".ko") ||
235 !strcmp(cp + namesz, ".ko.gz"))) {
236 fclose(f);
237 return (1);
238 }
239 }
240 fclose(f);
241 #endif
242 return (0);
243 }
244
linux_version_code()245 static int linux_version_code()
246 {
247 #ifdef __linux__
248 struct utsname ut;
249 static int version_code = -1;
250 int major, minor, rev;
251 char *endptr;
252 const char *cp;
253
254 if (version_code > 0)
255 return version_code;
256
257 if (uname(&ut))
258 return 0;
259 cp = ut.release;
260
261 major = strtol(cp, &endptr, 10);
262 if (cp == endptr || *endptr != '.')
263 return 0;
264 cp = endptr + 1;
265 minor = strtol(cp, &endptr, 10);
266 if (cp == endptr || *endptr != '.')
267 return 0;
268 cp = endptr + 1;
269 rev = strtol(cp, &endptr, 10);
270 if (cp == endptr)
271 return 0;
272 version_code = (((major * 256) + minor) * 256) + rev;
273 return version_code;
274 #else
275 return 0;
276 #endif
277 }
278
279 #define EXT4_SUPPORTS_EXT2 (2 * 65536 + 6*256 + 29)
280
system_supports_ext2(void)281 static int system_supports_ext2(void)
282 {
283 static time_t last_check = 0;
284 static int ret = -1;
285 time_t now = time(0);
286
287 if (ret != -1 || (now - last_check) < 5)
288 return ret;
289 last_check = now;
290 ret = (fs_proc_check("ext2") || check_for_modules("ext2"));
291 return ret;
292 }
293
system_supports_ext4(void)294 static int system_supports_ext4(void)
295 {
296 static time_t last_check = 0;
297 static int ret = -1;
298 time_t now = time(0);
299
300 if (ret != -1 || (now - last_check) < 5)
301 return ret;
302 last_check = now;
303 ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
304 return ret;
305 }
306
system_supports_ext4dev(void)307 static int system_supports_ext4dev(void)
308 {
309 static time_t last_check = 0;
310 static int ret = -1;
311 time_t now = time(0);
312
313 if (ret != -1 || (now - last_check) < 5)
314 return ret;
315 last_check = now;
316 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
317 return ret;
318 }
319
probe_ext4dev(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)320 static int probe_ext4dev(struct blkid_probe *probe,
321 struct blkid_magic *id,
322 unsigned char *buf)
323 {
324 struct ext2_super_block *es;
325 es = (struct ext2_super_block *)buf;
326
327 /* Distinguish from jbd */
328 if (blkid_le32(es->s_feature_incompat) &
329 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
330 return -BLKID_ERR_PARAM;
331
332 /*
333 * If the filesystem does not have a journal and ext2 and ext4
334 * is not present, then force this to be detected as an
335 * ext4dev filesystem.
336 */
337 if (!(blkid_le32(es->s_feature_compat) &
338 EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
339 !system_supports_ext2() && !system_supports_ext4() &&
340 system_supports_ext4dev() &&
341 linux_version_code() >= EXT4_SUPPORTS_EXT2)
342 goto force_ext4dev;
343
344 /*
345 * If the filesystem is marked as OK for use by in-development
346 * filesystem code, but ext4dev is not supported, and ext4 is,
347 * then don't call ourselves ext4dev, since we should be
348 * detected as ext4 in that case.
349 *
350 * If the filesystem is marked as in use by production
351 * filesystem, then it can only be used by ext4 and NOT by
352 * ext4dev, so always disclaim we are ext4dev in that case.
353 */
354 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
355 if (!system_supports_ext4dev() && system_supports_ext4())
356 return -BLKID_ERR_PARAM;
357 } else
358 return -BLKID_ERR_PARAM;
359
360 force_ext4dev:
361 get_ext2_info(probe->dev, id, buf);
362 return 0;
363 }
364
probe_ext4(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)365 static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
366 unsigned char *buf)
367 {
368 struct ext2_super_block *es;
369 es = (struct ext2_super_block *)buf;
370
371 /* Distinguish from jbd */
372 if (blkid_le32(es->s_feature_incompat) &
373 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
374 return -BLKID_ERR_PARAM;
375
376 /*
377 * If the filesystem does not have a journal and ext2 is not
378 * present, then force this to be detected as an ext2
379 * filesystem.
380 */
381 if (!(blkid_le32(es->s_feature_compat) &
382 EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
383 !system_supports_ext2() && system_supports_ext4() &&
384 linux_version_code() >= EXT4_SUPPORTS_EXT2)
385 goto force_ext4;
386
387 /* Ext4 has at least one feature which ext3 doesn't understand */
388 if (!(blkid_le32(es->s_feature_ro_compat) &
389 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
390 !(blkid_le32(es->s_feature_incompat) &
391 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
392 return -BLKID_ERR_PARAM;
393
394 force_ext4:
395 /*
396 * If the filesystem is a OK for use by in-development
397 * filesystem code, and ext4dev is supported or ext4 is not
398 * supported, then don't call ourselves ext4, so we can redo
399 * the detection and mark the filesystem as ext4dev.
400 *
401 * If the filesystem is marked as in use by production
402 * filesystem, then it can only be used by ext4 and NOT by
403 * ext4dev.
404 */
405 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
406 if (system_supports_ext4dev() || !system_supports_ext4())
407 return -BLKID_ERR_PARAM;
408 }
409 get_ext2_info(probe->dev, id, buf);
410 return 0;
411 }
412
probe_ext3(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)413 static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
414 unsigned char *buf)
415 {
416 struct ext2_super_block *es;
417 es = (struct ext2_super_block *)buf;
418
419 /* ext3 requires journal */
420 if (!(blkid_le32(es->s_feature_compat) &
421 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
422 return -BLKID_ERR_PARAM;
423
424 /* Any features which ext3 doesn't understand */
425 if ((blkid_le32(es->s_feature_ro_compat) &
426 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
427 (blkid_le32(es->s_feature_incompat) &
428 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
429 return -BLKID_ERR_PARAM;
430
431 get_ext2_info(probe->dev, id, buf);
432 return 0;
433 }
434
probe_ext2(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)435 static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
436 unsigned char *buf)
437 {
438 struct ext2_super_block *es;
439
440 es = (struct ext2_super_block *)buf;
441
442 /* Distinguish between ext3 and ext2 */
443 if ((blkid_le32(es->s_feature_compat) &
444 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
445 return -BLKID_ERR_PARAM;
446
447 /* Any features which ext2 doesn't understand */
448 if ((blkid_le32(es->s_feature_ro_compat) &
449 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
450 (blkid_le32(es->s_feature_incompat) &
451 EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
452 return -BLKID_ERR_PARAM;
453
454 /*
455 * If ext2 is not present, but ext4 or ext4dev are, then
456 * disclaim we are ext2
457 */
458 if (!system_supports_ext2() &&
459 (system_supports_ext4() || system_supports_ext4dev()) &&
460 linux_version_code() >= EXT4_SUPPORTS_EXT2)
461 return -BLKID_ERR_PARAM;
462
463 get_ext2_info(probe->dev, id, buf);
464 return 0;
465 }
466
probe_jbd(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)467 static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
468 unsigned char *buf)
469 {
470 struct ext2_super_block *es = (struct ext2_super_block *) buf;
471
472 if (!(blkid_le32(es->s_feature_incompat) &
473 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
474 return -BLKID_ERR_PARAM;
475
476 get_ext2_info(probe->dev, id, buf);
477
478 return 0;
479 }
480
481 #define FAT_ATTR_VOLUME_ID 0x08
482 #define FAT_ATTR_DIR 0x10
483 #define FAT_ATTR_LONG_NAME 0x0f
484 #define FAT_ATTR_MASK 0x3f
485 #define FAT_ENTRY_FREE 0xe5
486
487 static const char *no_name = "NO NAME ";
488
search_fat_label(struct vfat_dir_entry * dir,int count)489 static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
490 {
491 int i;
492
493 for (i = 0; i < count; i++) {
494 if (dir[i].name[0] == 0x00)
495 break;
496
497 if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
498 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
499 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
500 continue;
501
502 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) ==
503 FAT_ATTR_VOLUME_ID) {
504 return dir[i].name;
505 }
506 }
507 return 0;
508 }
509
510 /* FAT label extraction from the root directory taken from Kay
511 * Sievers's volume_id library */
probe_fat(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)512 static int probe_fat(struct blkid_probe *probe,
513 struct blkid_magic *id __BLKID_ATTR((unused)),
514 unsigned char *buf)
515 {
516 struct vfat_super_block *vs = (struct vfat_super_block *) buf;
517 struct msdos_super_block *ms = (struct msdos_super_block *) buf;
518 struct vfat_dir_entry *dir;
519 char serno[10];
520 const unsigned char *label = 0, *vol_label = 0, *tmp;
521 unsigned char *vol_serno;
522 int label_len = 0, maxloop = 100;
523 __u16 sector_size, dir_entries, reserved;
524 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
525 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries;
526
527 /* sector size check */
528 tmp = (unsigned char *)&ms->ms_sector_size;
529 sector_size = tmp[0] + (tmp[1] << 8);
530 if (sector_size != 0x200 && sector_size != 0x400 &&
531 sector_size != 0x800 && sector_size != 0x1000)
532 return 1;
533
534 tmp = (unsigned char *)&ms->ms_dir_entries;
535 dir_entries = tmp[0] + (tmp[1] << 8);
536 reserved = blkid_le16(ms->ms_reserved);
537 tmp = (unsigned char *)&ms->ms_sectors;
538 sect_count = tmp[0] + (tmp[1] << 8);
539 if (sect_count == 0)
540 sect_count = blkid_le32(ms->ms_total_sect);
541
542 fat_length = blkid_le16(ms->ms_fat_length);
543 if (fat_length == 0)
544 fat_length = blkid_le32(vs->vs_fat32_length);
545
546 fat_size = fat_length * ms->ms_fats;
547 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
548 (sector_size-1)) / sector_size;
549
550 cluster_count = sect_count - (reserved + fat_size + dir_size);
551 if (ms->ms_cluster_size == 0)
552 return 1;
553 cluster_count /= ms->ms_cluster_size;
554
555 if (cluster_count > FAT32_MAX)
556 return 1;
557
558 if (ms->ms_fat_length) {
559 /* the label may be an attribute in the root directory */
560 root_start = (reserved + fat_size) * sector_size;
561 root_dir_entries = vs->vs_dir_entries[0] +
562 (vs->vs_dir_entries[1] << 8);
563
564 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
565 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start,
566 buf_size);
567 if (dir)
568 vol_label = search_fat_label(dir, root_dir_entries);
569
570 if (!vol_label || !memcmp(vol_label, no_name, 11))
571 vol_label = ms->ms_label;
572 vol_serno = ms->ms_serno;
573
574 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos",
575 sizeof("msdos"));
576 } else {
577 /* Search the FAT32 root dir for the label attribute */
578 buf_size = vs->vs_cluster_size * sector_size;
579 start_data_sect = reserved + fat_size;
580
581 next = blkid_le32(vs->vs_root_cluster);
582 while (next && --maxloop) {
583 __u32 next_sect_off;
584 __u64 next_off, fat_entry_off;
585 int count;
586
587 next_sect_off = (next - 2) * vs->vs_cluster_size;
588 next_off = (start_data_sect + next_sect_off) *
589 sector_size;
590
591 dir = (struct vfat_dir_entry *)
592 get_buffer(probe, next_off, buf_size);
593 if (dir == NULL)
594 break;
595
596 count = buf_size / sizeof(struct vfat_dir_entry);
597
598 vol_label = search_fat_label(dir, count);
599 if (vol_label)
600 break;
601
602 /* get FAT entry */
603 fat_entry_off = (reserved * sector_size) +
604 (next * sizeof(__u32));
605 buf = get_buffer(probe, fat_entry_off, buf_size);
606 if (buf == NULL)
607 break;
608
609 /* set next cluster */
610 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
611 }
612
613 if (!vol_label || !memcmp(vol_label, no_name, 11))
614 vol_label = vs->vs_label;
615 vol_serno = vs->vs_serno;
616 }
617
618 if (vol_label && memcmp(vol_label, no_name, 11)) {
619 if ((label_len = figure_label_len(vol_label, 11)))
620 label = vol_label;
621 }
622
623 /* We can't just print them as %04X, because they are unaligned */
624 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
625 vol_serno[1], vol_serno[0]);
626
627 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
628 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);
629
630 return 0;
631 }
632
633 /*
634 * The FAT filesystem could be without a magic string in superblock
635 * (e.g. old floppies). This heuristic for FAT detection is inspired
636 * by http://vrfy.org/projects/volume_id/ and Linux kernel.
637 * [7-Jul-2005, Karel Zak <kzak@redhat.com>]
638 */
probe_fat_nomagic(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)639 static int probe_fat_nomagic(struct blkid_probe *probe,
640 struct blkid_magic *id __BLKID_ATTR((unused)),
641 unsigned char *buf)
642 {
643 struct msdos_super_block *ms;
644
645 ms = (struct msdos_super_block *)buf;
646
647 /* heads check */
648 if (ms->ms_heads == 0)
649 return 1;
650
651 /* cluster size check*/
652 if (ms->ms_cluster_size == 0 ||
653 (ms->ms_cluster_size & (ms->ms_cluster_size-1)))
654 return 1;
655
656 /* media check */
657 if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0)
658 return 1;
659
660 /* fat counts(Linux kernel expects at least 1 FAT table) */
661 if (!ms->ms_fats)
662 return 1;
663
664 /*
665 * OS/2 and apparently DFSee will place a FAT12/16-like
666 * pseudo-superblock in the first 512 bytes of non-FAT
667 * filesystems --- at least JFS and HPFS, and possibly others.
668 * So we explicitly check for those filesystems at the
669 * FAT12/16 filesystem magic field identifier, and if they are
670 * present, we rule this out as a FAT filesystem, despite the
671 * FAT-like pseudo-header.
672 */
673 if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) ||
674 (memcmp(ms->ms_magic, "HPFS ", 8) == 0))
675 return 1;
676
677 return probe_fat(probe, id, buf);
678 }
679
probe_ntfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)680 static int probe_ntfs(struct blkid_probe *probe,
681 struct blkid_magic *id __BLKID_ATTR((unused)),
682 unsigned char *buf)
683 {
684 struct ntfs_super_block *ns;
685 struct master_file_table_record *mft;
686 struct file_attribute *attr;
687 char uuid_str[17], label_str[129], *cp;
688 int bytes_per_sector, sectors_per_cluster;
689 int mft_record_size, attr_off, attr_len;
690 unsigned int i, attr_type, val_len;
691 int val_off;
692 __u64 nr_clusters;
693 blkid_loff_t off;
694 unsigned char *buf_mft, *val;
695
696 ns = (struct ntfs_super_block *) buf;
697
698 bytes_per_sector = ns->bios_parameter_block[0] +
699 (ns->bios_parameter_block[1] << 8);
700 sectors_per_cluster = ns->bios_parameter_block[2];
701
702 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
703 return 1;
704
705 if (ns->cluster_per_mft_record < 0)
706 mft_record_size = 1 << (0-ns->cluster_per_mft_record);
707 else
708 mft_record_size = ns->cluster_per_mft_record *
709 sectors_per_cluster * bytes_per_sector;
710 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;
711
712 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
713 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
714 return 1;
715
716 off = blkid_le64(ns->mft_mirror_cluster_location) *
717 bytes_per_sector * sectors_per_cluster;
718
719 buf_mft = get_buffer(probe, off, mft_record_size);
720 if (!buf_mft)
721 return 1;
722
723 if (memcmp(buf_mft, "FILE", 4))
724 return 1;
725
726 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector *
727 sectors_per_cluster;
728
729 buf_mft = get_buffer(probe, off, mft_record_size);
730 if (!buf_mft)
731 return 1;
732
733 if (memcmp(buf_mft, "FILE", 4))
734 return 1;
735
736 off += MFT_RECORD_VOLUME * mft_record_size;
737
738 buf_mft = get_buffer(probe, off, mft_record_size);
739 if (!buf_mft)
740 return 1;
741
742 if (memcmp(buf_mft, "FILE", 4))
743 return 1;
744
745 mft = (struct master_file_table_record *) buf_mft;
746
747 attr_off = blkid_le16(mft->attrs_offset);
748 label_str[0] = 0;
749
750 while (1) {
751 attr = (struct file_attribute *) (buf_mft + attr_off);
752 attr_len = blkid_le16(attr->len);
753 attr_type = blkid_le32(attr->type);
754 val_off = blkid_le16(attr->value_offset);
755 val_len = blkid_le32(attr->value_len);
756
757 attr_off += attr_len;
758
759 if ((attr_off > mft_record_size) ||
760 (attr_len == 0))
761 break;
762
763 if (attr_type == MFT_RECORD_ATTR_END)
764 break;
765
766 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
767 if (val_len > sizeof(label_str))
768 val_len = sizeof(label_str)-1;
769
770 for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
771 val = ((__u8 *) attr) + val_off + i;
772 *cp = val[0];
773 if (val[1])
774 *cp = '?';
775 }
776 *cp = 0;
777 }
778 }
779
780 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
781 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
782 if (label_str[0])
783 blkid_set_tag(probe->dev, "LABEL", label_str, 0);
784 return 0;
785 }
786
787
probe_xfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)788 static int probe_xfs(struct blkid_probe *probe,
789 struct blkid_magic *id __BLKID_ATTR((unused)),
790 unsigned char *buf)
791 {
792 struct xfs_super_block *xs;
793 const char *label = 0;
794
795 xs = (struct xfs_super_block *)buf;
796
797 if (strlen(xs->xs_fname))
798 label = xs->xs_fname;
799 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
800 set_uuid(probe->dev, xs->xs_uuid, 0);
801 return 0;
802 }
803
probe_reiserfs(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)804 static int probe_reiserfs(struct blkid_probe *probe,
805 struct blkid_magic *id, unsigned char *buf)
806 {
807 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
808 unsigned int blocksize;
809 const char *label = 0;
810
811 blocksize = blkid_le16(rs->rs_blocksize);
812
813 /* The blocksize must be at least 1k */
814 if ((blocksize >> 10) == 0)
815 return -BLKID_ERR_PARAM;
816
817 /* If the superblock is inside the journal, we have the wrong one */
818 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
819 return -BLKID_ERR_BIG;
820
821 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
822 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
823 if (strlen(rs->rs_label))
824 label = rs->rs_label;
825 set_uuid(probe->dev, rs->rs_uuid, 0);
826 }
827 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));
828
829 return 0;
830 }
831
probe_reiserfs4(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)832 static int probe_reiserfs4(struct blkid_probe *probe,
833 struct blkid_magic *id __BLKID_ATTR((unused)),
834 unsigned char *buf)
835 {
836 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
837 const unsigned char *label = 0;
838
839 if (strlen((char *) rs4->rs4_label))
840 label = rs4->rs4_label;
841 set_uuid(probe->dev, rs4->rs4_uuid, 0);
842 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
843 sizeof(rs4->rs4_label));
844
845 return 0;
846 }
847
probe_jfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)848 static int probe_jfs(struct blkid_probe *probe,
849 struct blkid_magic *id __BLKID_ATTR((unused)),
850 unsigned char *buf)
851 {
852 struct jfs_super_block *js;
853 const char *label = 0;
854
855 js = (struct jfs_super_block *)buf;
856
857 if (blkid_le32(js->js_bsize) != (1 << blkid_le16(js->js_l2bsize)))
858 return 1;
859
860 if (blkid_le32(js->js_pbsize) != (1 << blkid_le16(js->js_l2pbsize)))
861 return 1;
862
863 if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) !=
864 blkid_le16(js->js_l2bfactor))
865 return 1;
866
867 if (strlen((char *) js->js_label))
868 label = (char *) js->js_label;
869 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label));
870 set_uuid(probe->dev, js->js_uuid, 0);
871 return 0;
872 }
873
probe_zfs(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)874 static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id,
875 unsigned char *buf)
876 {
877 #if 0
878 char *vdev_label;
879 const char *pool_name = 0;
880
881 /* read nvpair data for pool name, pool GUID (complex) */
882 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
883 set_uuid(probe->dev, pool_guid, 0);
884 #endif
885 return 0;
886 }
887
probe_luks(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)888 static int probe_luks(struct blkid_probe *probe,
889 struct blkid_magic *id __BLKID_ATTR((unused)),
890 unsigned char *buf)
891 {
892 char uuid[40];
893
894 /* 168 is the offset to the 40 character uuid:
895 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
896 strncpy(uuid, (char *) buf+168, 40);
897 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid));
898 return 0;
899 }
900
probe_romfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)901 static int probe_romfs(struct blkid_probe *probe,
902 struct blkid_magic *id __BLKID_ATTR((unused)),
903 unsigned char *buf)
904 {
905 struct romfs_super_block *ros;
906 const char *label = 0;
907
908 ros = (struct romfs_super_block *)buf;
909
910 if (strlen((char *) ros->ros_volume))
911 label = (char *) ros->ros_volume;
912 blkid_set_tag(probe->dev, "LABEL", label, 0);
913 return 0;
914 }
915
probe_cramfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)916 static int probe_cramfs(struct blkid_probe *probe,
917 struct blkid_magic *id __BLKID_ATTR((unused)),
918 unsigned char *buf)
919 {
920 struct cramfs_super_block *csb;
921 const char *label = 0;
922
923 csb = (struct cramfs_super_block *)buf;
924
925 if (strlen((char *) csb->name))
926 label = (char *) csb->name;
927 blkid_set_tag(probe->dev, "LABEL", label, 0);
928 return 0;
929 }
930
probe_swap0(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf __BLKID_ATTR ((unused)))931 static int probe_swap0(struct blkid_probe *probe,
932 struct blkid_magic *id __BLKID_ATTR((unused)),
933 unsigned char *buf __BLKID_ATTR((unused)))
934 {
935 blkid_set_tag(probe->dev, "UUID", 0, 0);
936 blkid_set_tag(probe->dev, "LABEL", 0, 0);
937 return 0;
938 }
939
probe_swap1(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf __BLKID_ATTR ((unused)))940 static int probe_swap1(struct blkid_probe *probe,
941 struct blkid_magic *id,
942 unsigned char *buf __BLKID_ATTR((unused)))
943 {
944 struct swap_id_block *sws;
945
946 probe_swap0(probe, id, buf);
947 /*
948 * Version 1 swap headers are always located at offset of 1024
949 * bytes, although the swap signature itself is located at the
950 * end of the page (which may vary depending on hardware
951 * pagesize).
952 */
953 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
954 if (!sws)
955 return 1;
956
957 /* check for wrong version or zeroed pagecount, for sanity */
958 if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
959 (sws->sws_version != 1 || sws->sws_lastpage == 0))
960 return 1;
961
962 /* arbitrary sanity check.. is there any garbage down there? */
963 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
964 if (sws->sws_volume[0])
965 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
966 sizeof(sws->sws_volume));
967 if (sws->sws_uuid[0])
968 set_uuid(probe->dev, sws->sws_uuid, 0);
969 }
970 return 0;
971 }
972
probe_iso9660(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)973 static int probe_iso9660(struct blkid_probe *probe,
974 struct blkid_magic *id __BLKID_ATTR((unused)),
975 unsigned char *buf)
976 {
977 struct iso_volume_descriptor *iso;
978 const unsigned char *label;
979
980 iso = (struct iso_volume_descriptor *) buf;
981 label = iso->volume_id;
982
983 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
984 figure_label_len(label, 32));
985 return 0;
986 }
987
988
989 static const char
990 *udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
991 "NSR03", "TEA01", 0 };
992
probe_udf(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf __BLKID_ATTR ((unused)))993 static int probe_udf(struct blkid_probe *probe,
994 struct blkid_magic *id __BLKID_ATTR((unused)),
995 unsigned char *buf __BLKID_ATTR((unused)))
996 {
997 int j, bs;
998 struct iso_volume_descriptor *isosb;
999 const char ** m;
1000
1001 /* determine the block size by scanning in 2K increments
1002 (block sizes larger than 2K will be null padded) */
1003 for (bs = 1; bs < 16; bs++) {
1004 isosb = (struct iso_volume_descriptor *)
1005 get_buffer(probe, bs*2048+32768, sizeof(isosb));
1006 if (!isosb)
1007 return 1;
1008 if (isosb->vd_id[0])
1009 break;
1010 }
1011
1012 /* Scan up to another 64 blocks looking for additional VSD's */
1013 for (j = 1; j < 64; j++) {
1014 if (j > 1) {
1015 isosb = (struct iso_volume_descriptor *)
1016 get_buffer(probe, j*bs*2048+32768,
1017 sizeof(isosb));
1018 if (!isosb)
1019 return 1;
1020 }
1021 /* If we find NSR0x then call it udf:
1022 NSR01 for UDF 1.00
1023 NSR02 for UDF 1.50
1024 NSR03 for UDF 2.00 */
1025 if (!memcmp(isosb->vd_id, "NSR0", 4))
1026 return probe_iso9660(probe, id, buf);
1027 for (m = udf_magic; *m; m++)
1028 if (!memcmp(*m, isosb->vd_id, 5))
1029 break;
1030 if (*m == 0)
1031 return 1;
1032 }
1033 return 1;
1034 }
1035
probe_ocfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1036 static int probe_ocfs(struct blkid_probe *probe,
1037 struct blkid_magic *id __BLKID_ATTR((unused)),
1038 unsigned char *buf)
1039 {
1040 struct ocfs_volume_header ovh;
1041 struct ocfs_volume_label ovl;
1042 __u32 major;
1043
1044 memcpy(&ovh, buf, sizeof(ovh));
1045 memcpy(&ovl, buf+512, sizeof(ovl));
1046
1047 major = ocfsmajor(ovh);
1048 if (major == 1)
1049 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
1050 else if (major >= 9)
1051 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
1052
1053 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
1054 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
1055 set_uuid(probe->dev, ovl.vol_id, 0);
1056 return 0;
1057 }
1058
probe_ocfs2(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1059 static int probe_ocfs2(struct blkid_probe *probe,
1060 struct blkid_magic *id __BLKID_ATTR((unused)),
1061 unsigned char *buf)
1062 {
1063 struct ocfs2_super_block *osb;
1064
1065 osb = (struct ocfs2_super_block *)buf;
1066
1067 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
1068 set_uuid(probe->dev, osb->s_uuid, 0);
1069 return 0;
1070 }
1071
probe_oracleasm(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1072 static int probe_oracleasm(struct blkid_probe *probe,
1073 struct blkid_magic *id __BLKID_ATTR((unused)),
1074 unsigned char *buf)
1075 {
1076 struct oracle_asm_disk_label *dl;
1077
1078 dl = (struct oracle_asm_disk_label *)buf;
1079
1080 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
1081 return 0;
1082 }
1083
probe_gfs(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1084 static int probe_gfs(struct blkid_probe *probe,
1085 struct blkid_magic *id __BLKID_ATTR((unused)),
1086 unsigned char *buf)
1087 {
1088 struct gfs2_sb *sbd;
1089 const char *label = 0;
1090
1091 sbd = (struct gfs2_sb *)buf;
1092
1093 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
1094 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
1095 {
1096 blkid_set_tag(probe->dev, "UUID", 0, 0);
1097
1098 if (strlen(sbd->sb_locktable))
1099 label = sbd->sb_locktable;
1100 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1101 return 0;
1102 }
1103 return 1;
1104 }
1105
probe_gfs2(struct blkid_probe * probe,struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1106 static int probe_gfs2(struct blkid_probe *probe,
1107 struct blkid_magic *id __BLKID_ATTR((unused)),
1108 unsigned char *buf)
1109 {
1110 struct gfs2_sb *sbd;
1111 const char *label = 0;
1112
1113 sbd = (struct gfs2_sb *)buf;
1114
1115 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
1116 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
1117 {
1118 blkid_set_tag(probe->dev, "UUID", 0, 0);
1119
1120 if (strlen(sbd->sb_locktable))
1121 label = sbd->sb_locktable;
1122 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1123 return 0;
1124 }
1125 return 1;
1126 }
1127
unicode_16be_to_utf8(unsigned char * str,int out_len,const unsigned char * buf,int in_len)1128 static void unicode_16be_to_utf8(unsigned char *str, int out_len,
1129 const unsigned char *buf, int in_len)
1130 {
1131 int i, j;
1132 unsigned int c;
1133
1134 for (i = j = 0; i + 2 <= in_len; i += 2) {
1135 c = (buf[i] << 8) | buf[i+1];
1136 if (c == 0) {
1137 str[j] = '\0';
1138 break;
1139 } else if (c < 0x80) {
1140 if (j+1 >= out_len)
1141 break;
1142 str[j++] = (unsigned char) c;
1143 } else if (c < 0x800) {
1144 if (j+2 >= out_len)
1145 break;
1146 str[j++] = (unsigned char) (0xc0 | (c >> 6));
1147 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1148 } else {
1149 if (j+3 >= out_len)
1150 break;
1151 str[j++] = (unsigned char) (0xe0 | (c >> 12));
1152 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
1153 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1154 }
1155 }
1156 str[j] = '\0';
1157 }
1158
probe_hfs(struct blkid_probe * probe __BLKID_ATTR ((unused)),struct blkid_magic * id __BLKID_ATTR ((unused)),unsigned char * buf)1159 static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
1160 struct blkid_magic *id __BLKID_ATTR((unused)),
1161 unsigned char *buf)
1162 {
1163 struct hfs_mdb *hfs = (struct hfs_mdb *)buf;
1164 unsigned long long *uuid_ptr;
1165 char uuid_str[17];
1166 __u64 uuid;
1167
1168 if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
1169 (memcmp(hfs->embed_sig, "HX", 2) == 0))
1170 return 1; /* Not hfs, but an embedded HFS+ */
1171
1172 uuid_ptr = (unsigned long long *)hfs->finder_info.id;
1173 uuid = blkid_le64(*uuid_ptr);
1174 if (uuid) {
1175 sprintf(uuid_str, "%016llX", uuid);
1176 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1177 }
1178 blkid_set_tag(probe->dev, "LABEL", (char *)hfs->label, hfs->label_len);
1179 return 0;
1180 }
1181
1182
probe_hfsplus(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)1183 static int probe_hfsplus(struct blkid_probe *probe,
1184 struct blkid_magic *id,
1185 unsigned char *buf)
1186 {
1187 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
1188 struct hfsplus_bnode_descriptor *descr;
1189 struct hfsplus_bheader_record *bnode;
1190 struct hfsplus_catalog_key *key;
1191 struct hfsplus_vol_header *hfsplus;
1192 struct hfs_mdb *sbd = (struct hfs_mdb *) buf;
1193 unsigned int alloc_block_size;
1194 unsigned int alloc_first_block;
1195 unsigned int embed_first_block;
1196 unsigned int off = 0;
1197 unsigned int blocksize;
1198 unsigned int cat_block;
1199 unsigned int ext_block_start;
1200 unsigned int ext_block_count;
1201 unsigned int record_count;
1202 unsigned int leaf_node_head;
1203 unsigned int leaf_node_count;
1204 unsigned int leaf_node_size;
1205 unsigned int leaf_block;
1206 unsigned int label_len;
1207 unsigned long long *uuid_ptr;
1208 __u64 leaf_off, uuid;
1209 char uuid_str[17], label[512];
1210 int ext;
1211
1212 /* Check for a HFS+ volume embedded in a HFS volume */
1213 if (memcmp(sbd->signature, "BD", 2) == 0) {
1214 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
1215 (memcmp(sbd->embed_sig, "HX", 2) != 0))
1216 /* This must be an HFS volume, so fail */
1217 return 1;
1218
1219 alloc_block_size = blkid_be32(sbd->al_blk_size);
1220 alloc_first_block = blkid_be16(sbd->al_bl_st);
1221 embed_first_block = blkid_be16(sbd->embed_startblock);
1222 off = (alloc_first_block * 512) +
1223 (embed_first_block * alloc_block_size);
1224 buf = get_buffer(probe, off + (id->bim_kboff * 1024),
1225 sizeof(sbd));
1226 if (!buf)
1227 return 1;
1228
1229 hfsplus = (struct hfsplus_vol_header *) buf;
1230 }
1231
1232 hfsplus = (struct hfsplus_vol_header *) buf;
1233
1234 if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
1235 (memcmp(hfsplus->signature, "HX", 2) != 0))
1236 return 1;
1237
1238 uuid_ptr = (unsigned long long *)hfsplus->finder_info.id;
1239 uuid = blkid_le64(*uuid_ptr);
1240 if (uuid) {
1241 sprintf(uuid_str, "%016llX", uuid);
1242 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1243 }
1244
1245 blocksize = blkid_be32(hfsplus->blocksize);
1246 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
1247 cat_block = blkid_be32(extents[0].start_block);
1248
1249 buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000);
1250 if (!buf)
1251 return 0;
1252
1253 bnode = (struct hfsplus_bheader_record *)
1254 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1255
1256 leaf_node_head = blkid_be32(bnode->leaf_head);
1257 leaf_node_size = blkid_be16(bnode->node_size);
1258 leaf_node_count = blkid_be32(bnode->leaf_count);
1259 if (leaf_node_count == 0)
1260 return 0;
1261
1262 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
1263
1264 /* get physical location */
1265 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
1266 ext_block_start = blkid_be32(extents[ext].start_block);
1267 ext_block_count = blkid_be32(extents[ext].block_count);
1268 if (ext_block_count == 0)
1269 return 0;
1270
1271 /* this is our extent */
1272 if (leaf_block < ext_block_count)
1273 break;
1274
1275 leaf_block -= ext_block_count;
1276 }
1277 if (ext == HFSPLUS_EXTENT_COUNT)
1278 return 0;
1279
1280 leaf_off = (ext_block_start + leaf_block) * blocksize;
1281
1282 buf = get_buffer(probe, off + leaf_off, leaf_node_size);
1283 if (!buf)
1284 return 0;
1285
1286 descr = (struct hfsplus_bnode_descriptor *) buf;
1287 record_count = blkid_be16(descr->num_recs);
1288 if (record_count == 0)
1289 return 0;
1290
1291 if (descr->type != HFS_NODE_LEAF)
1292 return 0;
1293
1294 key = (struct hfsplus_catalog_key *)
1295 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1296
1297 if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID)
1298 return 0;
1299
1300 label_len = blkid_be16(key->unicode_len) * 2;
1301 unicode_16be_to_utf8((unsigned char *)label, sizeof(label),
1302 key->unicode, label_len);
1303 blkid_set_tag(probe->dev, "LABEL", label, 0);
1304 return 0;
1305 }
1306
1307 #define LVM2_LABEL_SIZE 512
lvm2_calc_crc(const void * buf,unsigned int size)1308 static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
1309 {
1310 static const unsigned int crctab[] = {
1311 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1312 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1313 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1314 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1315 };
1316 unsigned int i, crc = 0xf597a6cf;
1317 const __u8 *data = (const __u8 *) buf;
1318
1319 for (i = 0; i < size; i++) {
1320 crc ^= *data++;
1321 crc = (crc >> 4) ^ crctab[crc & 0xf];
1322 crc = (crc >> 4) ^ crctab[crc & 0xf];
1323 }
1324 return crc;
1325 }
1326
probe_lvm2(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)1327 static int probe_lvm2(struct blkid_probe *probe,
1328 struct blkid_magic *id,
1329 unsigned char *buf)
1330 {
1331 int sector = (id->bim_kboff) << 1;
1332 struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
1333 char *p, *q, uuid[40];
1334 unsigned int i, b;
1335
1336 /* buf is at 0k or 1k offset; find label inside */
1337 if (memcmp(buf, "LABELONE", 8) == 0) {
1338 label = (struct lvm2_pv_label_header *)buf;
1339 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
1340 label = (struct lvm2_pv_label_header *)(buf + 512);
1341 sector++;
1342 } else {
1343 return 1;
1344 }
1345
1346 if (blkid_le64(label->sector_xl) != (unsigned) sector) {
1347 DBG(DEBUG_PROBE,
1348 printf("LVM2: label for sector %llu found at sector %d\n",
1349 blkid_le64(label->sector_xl), sector));
1350 return 1;
1351 }
1352
1353 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
1354 ((char *)&label->offset_xl - (char *)label)) !=
1355 blkid_le32(label->crc_xl)) {
1356 DBG(DEBUG_PROBE,
1357 printf("LVM2: label checksum incorrect at sector %d\n",
1358 sector));
1359 return 1;
1360 }
1361
1362 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32;
1363 i++, b <<= 1) {
1364 if (b & 0x4444440)
1365 *p++ = '-';
1366 *p++ = *q++;
1367 }
1368
1369 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
1370
1371 return 0;
1372 }
1373
probe_btrfs(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)1374 static int probe_btrfs(struct blkid_probe *probe,
1375 struct blkid_magic *id,
1376 unsigned char *buf)
1377 {
1378 struct btrfs_super_block *bs;
1379 const char *label = 0;
1380
1381 bs = (struct btrfs_super_block *)buf;
1382
1383 if (strlen(bs->label))
1384 label = bs->label;
1385 blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label));
1386 set_uuid(probe->dev, bs->fsid, 0);
1387 return 0;
1388 }
1389
probe_f2fs(struct blkid_probe * probe,struct blkid_magic * id,unsigned char * buf)1390 static int probe_f2fs(struct blkid_probe *probe,
1391 struct blkid_magic *id,
1392 unsigned char *buf)
1393 {
1394 struct f2fs_super_block *bs;
1395
1396 bs = (struct f2fs_super_block *)buf;
1397 set_uuid(probe->dev, bs->uuid, 0);
1398 return 0;
1399 }
1400
1401 /*
1402 * Various filesystem magics that we can check for. Note that kboff and
1403 * sboff are in kilobytes and bytes respectively. All magics are in
1404 * byte strings so we don't worry about endian issues.
1405 */
1406 static struct blkid_magic type_array[] = {
1407 /* type kboff sboff len magic probe */
1408 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
1409 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs },
1410 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
1411 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev },
1412 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 },
1413 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
1414 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
1415 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
1416 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs },
1417 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs },
1418 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs },
1419 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs },
1420 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 },
1421 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 },
1422 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs },
1423 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat },
1424 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat },
1425 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat },
1426 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat },
1427 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat },
1428 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic },
1429 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic },
1430 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic },
1431 { "minix", 1, 0x10, 2, "\177\023", 0 },
1432 { "minix", 1, 0x10, 2, "\217\023", 0 },
1433 { "minix", 1, 0x10, 2, "\150\044", 0 },
1434 { "minix", 1, 0x10, 2, "\170\044", 0 },
1435 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 },
1436 { "xfs", 0, 0, 4, "XFSB", probe_xfs },
1437 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs },
1438 { "bfs", 0, 0, 4, "\316\372\173\033", 0 },
1439 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs },
1440 { "qnx4", 0, 4, 6, "QNX4FS", 0 },
1441 { "udf", 32, 1, 5, "BEA01", probe_udf },
1442 { "udf", 32, 1, 5, "BOOT2", probe_udf },
1443 { "udf", 32, 1, 5, "CD001", probe_udf },
1444 { "udf", 32, 1, 5, "CDW02", probe_udf },
1445 { "udf", 32, 1, 5, "NSR02", probe_udf },
1446 { "udf", 32, 1, 5, "NSR03", probe_udf },
1447 { "udf", 32, 1, 5, "TEA01", probe_udf },
1448 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 },
1449 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 },
1450 { "jfs", 32, 0, 4, "JFS1", probe_jfs },
1451 { "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1452 { "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1453 { "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1454 { "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1455 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus },
1456 { "hfsplus", 1, 0, 2, "H+", probe_hfsplus },
1457 { "hfsplus", 1, 0, 2, "HX", probe_hfsplus },
1458 { "hfs", 1, 0, 2, "BD", probe_hfs },
1459 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 },
1460 { "hpfs", 8, 0, 4, "I\350\225\371", 0 },
1461 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 },
1462 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 },
1463 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 },
1464 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 },
1465 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 },
1466 { "swsuspend", 0, 0xff6, 9, "ULSUSPEND", probe_swap1 },
1467 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 },
1468 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 },
1469 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 },
1470 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 },
1471 { "swsuspend", 0, 0x1ff6, 9, "ULSUSPEND", probe_swap1 },
1472 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 },
1473 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 },
1474 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 },
1475 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 },
1476 { "swsuspend", 0, 0x3ff6, 9, "ULSUSPEND", probe_swap1 },
1477 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 },
1478 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 },
1479 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 },
1480 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 },
1481 { "swsuspend", 0, 0x7ff6, 9, "ULSUSPEND", probe_swap1 },
1482 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 },
1483 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 },
1484 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 },
1485 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 },
1486 { "swsuspend", 0, 0xfff6, 9, "ULSUSPEND", probe_swap1 },
1487 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs },
1488 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 },
1489 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 },
1490 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 },
1491 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 },
1492 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks },
1493 { "squashfs", 0, 0, 4, "sqsh", 0 },
1494 { "squashfs", 0, 0, 4, "hsqs", 0 },
1495 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 },
1496 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 },
1497 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 },
1498 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 },
1499 { "btrfs", 64, 0x40, 8, "_BHRfS_M", probe_btrfs },
1500 { "f2fs", 1, 0, 4, "\x10\x20\xf5\xf2", probe_f2fs },
1501 { NULL, 0, 0, 0, NULL, NULL }
1502 };
1503
1504 /*
1505 * Verify that the data in dev is consistent with what is on the actual
1506 * block device (using the devname field only). Normally this will be
1507 * called when finding items in the cache, but for long running processes
1508 * is also desirable to revalidate an item before use.
1509 *
1510 * If we are unable to revalidate the data, we return the old data and
1511 * do not set the BLKID_BID_FL_VERIFIED flag on it.
1512 */
blkid_verify(blkid_cache cache,blkid_dev dev)1513 blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
1514 {
1515 struct blkid_magic *id;
1516 struct blkid_probe probe;
1517 blkid_tag_iterate iter;
1518 unsigned char *buf;
1519 const char *type, *value;
1520 struct stat st;
1521 time_t now;
1522 double diff;
1523 int idx;
1524
1525 if (!dev)
1526 return NULL;
1527
1528 now = time(0);
1529 diff = difftime(now, dev->bid_time);
1530
1531 if (stat(dev->bid_name, &st) < 0) {
1532 DBG(DEBUG_PROBE,
1533 printf("blkid_verify: error %s (%d) while "
1534 "trying to stat %s\n", strerror(errno), errno,
1535 dev->bid_name));
1536 open_err:
1537 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
1538 /* We don't have read permission, just return cache data. */
1539 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n",
1540 dev->bid_name));
1541 return dev;
1542 }
1543 blkid_free_dev(dev);
1544 return NULL;
1545 }
1546
1547 if ((now >= dev->bid_time) &&
1548 (st.st_mtime <= dev->bid_time) &&
1549 ((diff < BLKID_PROBE_MIN) ||
1550 (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
1551 diff < BLKID_PROBE_INTERVAL)))
1552 return dev;
1553
1554 DBG(DEBUG_PROBE,
1555 printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t"
1556 "time since last check %lu)\n",
1557 dev->bid_name, (unsigned long)dev->bid_time,
1558 (unsigned long)st.st_mtime, (unsigned long)diff));
1559
1560 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
1561 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
1562 "opening %s\n", strerror(errno), errno,
1563 dev->bid_name));
1564 goto open_err;
1565 }
1566
1567 probe.cache = cache;
1568 probe.dev = dev;
1569 probe.sbbuf = 0;
1570 probe.buf = 0;
1571 probe.buf_max = 0;
1572
1573 /*
1574 * Iterate over the type array. If we already know the type,
1575 * then try that first. If it doesn't work, then blow away
1576 * the type information, and try again.
1577 *
1578 */
1579 try_again:
1580 type = 0;
1581 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
1582 uuid_t uuid;
1583
1584 if (check_mdraid(probe.fd, uuid) == 0) {
1585 set_uuid(dev, uuid, 0);
1586 type = "mdraid";
1587 goto found_type;
1588 }
1589 }
1590 for (id = type_array; id->bim_type; id++) {
1591 if (dev->bid_type &&
1592 strcmp(id->bim_type, dev->bid_type))
1593 continue;
1594
1595 idx = id->bim_kboff + (id->bim_sboff >> 10);
1596 buf = get_buffer(&probe, idx << 10, 1024);
1597 if (!buf)
1598 continue;
1599
1600 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff),
1601 id->bim_len))
1602 continue;
1603
1604 if ((id->bim_probe == NULL) ||
1605 (id->bim_probe(&probe, id, buf) == 0)) {
1606 type = id->bim_type;
1607 goto found_type;
1608 }
1609 }
1610
1611 if (!id->bim_type && dev->bid_type) {
1612 /*
1613 * Zap the device filesystem information and try again
1614 */
1615 DBG(DEBUG_PROBE,
1616 printf("previous fs type %s not valid, "
1617 "trying full probe\n", dev->bid_type));
1618 iter = blkid_tag_iterate_begin(dev);
1619 while (blkid_tag_next(iter, &type, &value) == 0)
1620 blkid_set_tag(dev, type, 0, 0);
1621 blkid_tag_iterate_end(iter);
1622 goto try_again;
1623 }
1624
1625 if (!dev->bid_type) {
1626 blkid_free_dev(dev);
1627 dev = 0;
1628 goto found_type;
1629 }
1630
1631 found_type:
1632 if (dev && type) {
1633 dev->bid_devno = st.st_rdev;
1634 dev->bid_time = time(0);
1635 dev->bid_flags |= BLKID_BID_FL_VERIFIED;
1636 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
1637
1638 blkid_set_tag(dev, "TYPE", type, 0);
1639
1640 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
1641 dev->bid_name, (long long)st.st_rdev, type));
1642 }
1643
1644 free(probe.sbbuf);
1645 free(probe.buf);
1646 if (probe.fd >= 0)
1647 close(probe.fd);
1648
1649 return dev;
1650 }
1651
blkid_known_fstype(const char * fstype)1652 int blkid_known_fstype(const char *fstype)
1653 {
1654 struct blkid_magic *id;
1655
1656 for (id = type_array; id->bim_type; id++) {
1657 if (strcmp(fstype, id->bim_type) == 0)
1658 return 1;
1659 }
1660 return 0;
1661 }
1662
1663 #ifdef TEST_PROGRAM
main(int argc,char ** argv)1664 int main(int argc, char **argv)
1665 {
1666 blkid_dev dev;
1667 blkid_cache cache;
1668 int ret;
1669
1670 if (argc != 2) {
1671 fprintf(stderr, "Usage: %s device\n"
1672 "Probe a single device to determine type\n", argv[0]);
1673 exit(1);
1674 }
1675 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
1676 fprintf(stderr, "%s: error creating cache (%d)\n",
1677 argv[0], ret);
1678 exit(1);
1679 }
1680 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
1681 if (!dev) {
1682 printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
1683 return (1);
1684 }
1685 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
1686 if (dev->bid_label)
1687 printf("LABEL='%s'\n", dev->bid_label);
1688 if (dev->bid_uuid)
1689 printf("UUID='%s'\n", dev->bid_uuid);
1690
1691 blkid_free_dev(dev);
1692 return (0);
1693 }
1694 #endif
1695