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