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fix logic bug inside extroot uuid verification code
[project/fstools.git] / block.c
1 /*
2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #define _GNU_SOURCE
16 #include <getopt.h>
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <syslog.h>
20 #include <libgen.h>
21 #include <glob.h>
22 #include <dirent.h>
23 #include <stdarg.h>
24 #include <string.h>
25
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 #include <sys/swap.h>
29 #include <sys/mount.h>
30 #include <sys/wait.h>
31
32 #include <linux/fs.h>
33
34 #include <uci.h>
35 #include <uci_blob.h>
36
37 #include <libubox/ulog.h>
38 #include <libubox/list.h>
39 #include <libubox/vlist.h>
40 #include <libubox/blobmsg_json.h>
41 #include <libubox/avl-cmp.h>
42
43 #include "libblkid-tiny/libblkid-tiny.h"
44
45 #ifdef UBIFS_EXTROOT
46 #include "libubi/libubi.h"
47 #endif
48
49 enum {
50 TYPE_MOUNT,
51 TYPE_SWAP,
52 };
53
54 struct mount {
55 struct vlist_node node;
56 int type;
57
58 char *target;
59 char *path;
60 char *options;
61 uint32_t flags;
62 char *uuid;
63 char *label;
64 char *device;
65 int extroot;
66 int overlay;
67 int disabled_fsck;
68 unsigned int prio;
69 };
70
71 static struct vlist_tree mounts;
72 static struct blob_buf b;
73 static LIST_HEAD(devices);
74 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
75 static unsigned int delay_root;
76
77 enum {
78 CFG_ANON_MOUNT,
79 CFG_ANON_SWAP,
80 CFG_AUTO_MOUNT,
81 CFG_AUTO_SWAP,
82 CFG_DELAY_ROOT,
83 CFG_CHECK_FS,
84 __CFG_MAX
85 };
86
87 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
88 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
89 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
90 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
91 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
92 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
93 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
94 };
95
96 enum {
97 MOUNT_UUID,
98 MOUNT_LABEL,
99 MOUNT_ENABLE,
100 MOUNT_TARGET,
101 MOUNT_DEVICE,
102 MOUNT_OPTIONS,
103 __MOUNT_MAX
104 };
105
106 static const struct uci_blob_param_list config_attr_list = {
107 .n_params = __CFG_MAX,
108 .params = config_policy,
109 };
110
111 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
112 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
113 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
114 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
115 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
116 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
117 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
118 };
119
120 static const struct uci_blob_param_list mount_attr_list = {
121 .n_params = __MOUNT_MAX,
122 .params = mount_policy,
123 };
124
125 enum {
126 SWAP_ENABLE,
127 SWAP_UUID,
128 SWAP_LABEL,
129 SWAP_DEVICE,
130 SWAP_PRIO,
131 __SWAP_MAX
132 };
133
134 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
135 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
136 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
137 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
138 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
139 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
140 };
141
142 static const struct uci_blob_param_list swap_attr_list = {
143 .n_params = __SWAP_MAX,
144 .params = swap_policy,
145 };
146
147 struct mount_flag {
148 const char *name;
149 int32_t flag;
150 };
151
152 static const struct mount_flag mount_flags[] = {
153 { "sync", MS_SYNCHRONOUS },
154 { "async", ~MS_SYNCHRONOUS },
155 { "dirsync", MS_DIRSYNC },
156 { "mand", MS_MANDLOCK },
157 { "nomand", ~MS_MANDLOCK },
158 { "atime", ~MS_NOATIME },
159 { "noatime", MS_NOATIME },
160 { "dev", ~MS_NODEV },
161 { "nodev", MS_NODEV },
162 { "diratime", ~MS_NODIRATIME },
163 { "nodiratime", MS_NODIRATIME },
164 { "exec", ~MS_NOEXEC },
165 { "noexec", MS_NOEXEC },
166 { "suid", ~MS_NOSUID },
167 { "nosuid", MS_NOSUID },
168 { "rw", ~MS_RDONLY },
169 { "ro", MS_RDONLY },
170 { "relatime", MS_RELATIME },
171 { "norelatime", ~MS_RELATIME },
172 { "strictatime", MS_STRICTATIME },
173 { "acl", MS_POSIXACL },
174 { "noacl", ~MS_POSIXACL },
175 { "nouser_xattr", MS_NOUSER },
176 { "user_xattr", ~MS_NOUSER },
177 };
178
179 static char *blobmsg_get_strdup(struct blob_attr *attr)
180 {
181 if (!attr)
182 return NULL;
183
184 return strdup(blobmsg_get_string(attr));
185 }
186
187 static char *blobmsg_get_basename(struct blob_attr *attr)
188 {
189 if (!attr)
190 return NULL;
191
192 return strdup(basename(blobmsg_get_string(attr)));
193 }
194
195 static void parse_mount_options(struct mount *m, char *optstr)
196 {
197 int i;
198 bool is_flag;
199 char *p, *opts, *last;
200
201 m->flags = 0;
202 m->options = NULL;
203
204 if (!optstr || !*optstr)
205 return;
206
207 m->options = opts = calloc(1, strlen(optstr) + 1);
208
209 if (!m->options)
210 return;
211
212 p = last = optstr;
213
214 do {
215 p = strchr(p, ',');
216
217 if (p)
218 *p++ = 0;
219
220 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
221 if (!strcmp(last, mount_flags[i].name)) {
222 if (mount_flags[i].flag < 0)
223 m->flags &= (uint32_t)mount_flags[i].flag;
224 else
225 m->flags |= (uint32_t)mount_flags[i].flag;
226 is_flag = true;
227 break;
228 }
229 }
230
231 if (!is_flag)
232 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
233
234 last = p;
235
236 } while (p);
237
238 free(optstr);
239 }
240
241 static int mount_add(struct uci_section *s)
242 {
243 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
244 struct mount *m;
245
246 blob_buf_init(&b, 0);
247 uci_to_blob(&b, s, &mount_attr_list);
248 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
249
250 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
251 return -1;
252
253 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
254 return -1;
255
256 m = malloc(sizeof(struct mount));
257 m->type = TYPE_MOUNT;
258 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
259 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
260 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
261 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
262
263 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
264
265 m->overlay = m->extroot = 0;
266 if (m->target && !strcmp(m->target, "/"))
267 m->extroot = 1;
268 if (m->target && !strcmp(m->target, "/overlay"))
269 m->extroot = m->overlay = 1;
270
271 if (m->target && *m->target != '/') {
272 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
273 s->e.name, m->target);
274 free(m);
275 return -1;
276 }
277
278 if (m->uuid)
279 vlist_add(&mounts, &m->node, m->uuid);
280 else if (m->label)
281 vlist_add(&mounts, &m->node, m->label);
282 else if (m->device)
283 vlist_add(&mounts, &m->node, m->device);
284
285 return 0;
286 }
287
288 static int swap_add(struct uci_section *s)
289 {
290 struct blob_attr *tb[__SWAP_MAX] = { 0 };
291 struct mount *m;
292
293 blob_buf_init(&b, 0);
294 uci_to_blob(&b, s, &swap_attr_list);
295 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
296
297 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
298 return -1;
299
300 m = malloc(sizeof(struct mount));
301 memset(m, 0, sizeof(struct mount));
302 m->type = TYPE_SWAP;
303 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
304 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
305 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
306 if (tb[SWAP_PRIO])
307 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
308 if (m->prio)
309 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
310
311 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
312 /* store complete swap path */
313 if (tb[SWAP_DEVICE])
314 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
315
316 if (m->uuid)
317 vlist_add(&mounts, &m->node, m->uuid);
318 else if (m->label)
319 vlist_add(&mounts, &m->node, m->label);
320 else if (m->device)
321 vlist_add(&mounts, &m->node, m->device);
322 }
323
324 return 0;
325 }
326
327 static int global_add(struct uci_section *s)
328 {
329 struct blob_attr *tb[__CFG_MAX] = { 0 };
330
331 blob_buf_init(&b, 0);
332 uci_to_blob(&b, s, &config_attr_list);
333 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
334
335 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
336 anon_mount = 1;
337 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
338 anon_swap = 1;
339
340 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
341 auto_mount = 1;
342 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
343 auto_swap = 1;
344
345 if (tb[CFG_DELAY_ROOT])
346 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
347
348 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
349 check_fs = 1;
350
351 return 0;
352 }
353
354 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
355 {
356 struct mount *m;
357
358 vlist_for_each_element(&mounts, m, node) {
359 if (m->type != TYPE_SWAP)
360 continue;
361 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
362 return m;
363 if (label && m->label && !strcmp(m->label, label))
364 return m;
365 if (device && m->device && !strcmp(m->device, device))
366 return m;
367 }
368
369 return NULL;
370 }
371
372 static struct mount* find_block(const char *uuid, const char *label, const char *device,
373 const char *target)
374 {
375 struct mount *m;
376
377 vlist_for_each_element(&mounts, m, node) {
378 if (m->type != TYPE_MOUNT)
379 continue;
380 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
381 return m;
382 if (m->label && label && !strcmp(m->label, label))
383 return m;
384 if (m->target && target && !strcmp(m->target, target))
385 return m;
386 if (m->device && device && !strcmp(m->device, device))
387 return m;
388 }
389
390 return NULL;
391 }
392
393 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
394 struct vlist_node *node_old)
395 {
396 }
397
398 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
399 {
400 char *file = basename(path);
401 char *dir = dirname(path);
402 char *err;
403 struct uci_package *pkg;
404
405 uci_set_confdir(ctx, dir);
406 ULOG_INFO("attempting to load %s/%s\n", dir, file);
407
408 if (uci_load(ctx, file, &pkg)) {
409 uci_get_errorstr(ctx, &err, file);
410 ULOG_ERR("unable to load configuration (%s)\n", err);
411
412 free(err);
413 return NULL;
414 }
415
416 return pkg;
417 }
418
419 static int config_load(char *cfg)
420 {
421 struct uci_context *ctx = uci_alloc_context();
422 struct uci_package *pkg = NULL;
423 struct uci_element *e;
424 char path[64];
425
426 vlist_init(&mounts, avl_strcmp, mounts_update);
427
428 if (cfg) {
429 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
430 pkg = config_try_load(ctx, path);
431
432 if (!pkg) {
433 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
434 pkg = config_try_load(ctx, path);
435 }
436 }
437
438 if (!pkg) {
439 snprintf(path, sizeof(path), "/etc/config/fstab");
440 pkg = config_try_load(ctx, path);
441 }
442
443 if (!pkg) {
444 ULOG_ERR("no usable configuration\n");
445 return -1;
446 }
447
448 vlist_update(&mounts);
449 uci_foreach_element(&pkg->sections, e) {
450 struct uci_section *s = uci_to_section(e);
451
452 if (!strcmp(s->type, "mount"))
453 mount_add(s);
454 if (!strcmp(s->type, "swap"))
455 swap_add(s);
456 if (!strcmp(s->type, "global"))
457 global_add(s);
458 }
459 vlist_flush(&mounts);
460
461 return 0;
462 }
463
464 static struct blkid_struct_probe* _probe_path(char *path)
465 {
466 struct blkid_struct_probe *pr;
467 char tmppath[64];
468
469 /* skip ubi device if ubiblock device is present */
470 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
471 path[8] >= '0' && path[8] <= '9' ) {
472 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
473 list_for_each_entry(pr, &devices, list)
474 if (!strcasecmp(pr->dev, tmppath))
475 return NULL;
476 }
477
478 pr = malloc(sizeof(*pr));
479
480 if (!pr)
481 return NULL;
482
483 memset(pr, 0, sizeof(*pr));
484 probe_block(path, pr);
485
486 if (pr->err || !pr->id) {
487 free(pr);
488 return NULL;
489 }
490
491 return pr;
492 }
493
494 static int _cache_load(const char *path)
495 {
496 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
497 int j;
498 glob_t gl;
499
500 if (glob(path, gl_flags, NULL, &gl) < 0)
501 return -1;
502
503 for (j = 0; j < gl.gl_pathc; j++) {
504 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
505 if (pr)
506 list_add_tail(&pr->list, &devices);
507 }
508
509 globfree(&gl);
510
511 return 0;
512 }
513
514 static void cache_load(int mtd)
515 {
516 if (mtd) {
517 _cache_load("/dev/mtdblock*");
518 _cache_load("/dev/ubiblock*");
519 _cache_load("/dev/ubi[0-9]*");
520 }
521 _cache_load("/dev/mmcblk*");
522 _cache_load("/dev/sd*");
523 _cache_load("/dev/hd*");
524 _cache_load("/dev/md*");
525 _cache_load("/dev/vd*");
526 _cache_load("/dev/mapper/*");
527 }
528
529 static int print_block_info(struct blkid_struct_probe *pr)
530 {
531 printf("%s:", pr->dev);
532 if (pr->uuid[0])
533 printf(" UUID=\"%s\"", pr->uuid);
534
535 if (pr->label[0])
536 printf(" LABEL=\"%s\"", pr->label);
537
538 if (pr->name[0])
539 printf(" NAME=\"%s\"", pr->name);
540
541 if (pr->version[0])
542 printf(" VERSION=\"%s\"", pr->version);
543
544 printf(" TYPE=\"%s\"\n", pr->id->name);
545
546 return 0;
547 }
548
549 static int print_block_uci(struct blkid_struct_probe *pr)
550 {
551 if (!strcmp(pr->id->name, "swap")) {
552 printf("config 'swap'\n");
553 } else {
554 printf("config 'mount'\n");
555 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
556 }
557 if (pr->uuid[0])
558 printf("\toption\tuuid\t'%s'\n", pr->uuid);
559 else
560 printf("\toption\tdevice\t'%s'\n", pr->dev);
561 printf("\toption\tenabled\t'0'\n\n");
562
563 return 0;
564 }
565
566 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
567 {
568 struct blkid_struct_probe *pr = NULL;
569
570 if (uuid)
571 list_for_each_entry(pr, &devices, list)
572 if (!strcasecmp(pr->uuid, uuid))
573 return pr;
574
575 if (label)
576 list_for_each_entry(pr, &devices, list)
577 if (!strcmp(pr->label, label))
578 return pr;
579
580 if (path)
581 list_for_each_entry(pr, &devices, list)
582 if (!strcmp(basename(pr->dev), basename(path)))
583 return pr;
584
585 return NULL;
586 }
587
588 static char* find_mount_point(char *block)
589 {
590 FILE *fp = fopen("/proc/self/mountinfo", "r");
591 static char line[256];
592 int len = strlen(block);
593 char *point = NULL, *pos, *tmp, *cpoint, *devname;
594 struct stat s;
595 int rstat;
596 unsigned int minor, major;
597
598 if (!fp)
599 return NULL;
600
601 rstat = stat(block, &s);
602
603 while (fgets(line, sizeof(line), fp)) {
604 pos = strchr(line, ' ');
605 if (!pos)
606 continue;
607
608 pos = strchr(pos + 1, ' ');
609 if (!pos)
610 continue;
611
612 tmp = ++pos;
613 pos = strchr(pos, ':');
614 if (!pos)
615 continue;
616
617 *pos = '\0';
618 major = atoi(tmp);
619 tmp = ++pos;
620 pos = strchr(pos, ' ');
621 if (!pos)
622 continue;
623
624 *pos = '\0';
625 minor = atoi(tmp);
626 pos = strchr(pos + 1, ' ');
627 if (!pos)
628 continue;
629 tmp = ++pos;
630
631 pos = strchr(pos, ' ');
632 if (!pos)
633 continue;
634 *pos = '\0';
635 cpoint = tmp;
636
637 pos = strchr(pos + 1, ' ');
638 if (!pos)
639 continue;
640
641 pos = strchr(pos + 1, ' ');
642 if (!pos)
643 continue;
644
645 pos = strchr(pos + 1, ' ');
646 if (!pos)
647 continue;
648
649 tmp = ++pos;
650 pos = strchr(pos, ' ');
651 if (!pos)
652 continue;
653
654 *pos = '\0';
655 devname = tmp;
656 if (!strncmp(block, devname, len)) {
657 point = strdup(cpoint);
658 break;
659 }
660
661 if (rstat)
662 continue;
663
664 if (!S_ISBLK(s.st_mode))
665 continue;
666
667 if (major == major(s.st_rdev) &&
668 minor == minor(s.st_rdev)) {
669 point = strdup(cpoint);
670 break;
671 }
672 }
673
674 fclose(fp);
675
676 return point;
677 }
678
679 static void mkdir_p(char *dir)
680 {
681 char *l = strrchr(dir, '/');
682
683 if (l) {
684 *l = '\0';
685 mkdir_p(dir);
686 *l = '/';
687 mkdir(dir, 0755);
688 }
689 }
690
691 static void check_filesystem(struct blkid_struct_probe *pr)
692 {
693 pid_t pid;
694 struct stat statbuf;
695 const char *e2fsck = "/usr/sbin/e2fsck";
696 const char *dosfsck = "/usr/sbin/dosfsck";
697 const char *ckfs;
698
699 /* UBIFS does not need stuff like fsck */
700 if (!strncmp(pr->id->name, "ubifs", 5))
701 return;
702
703 if (!strncmp(pr->id->name, "vfat", 4)) {
704 ckfs = dosfsck;
705 } else if (!strncmp(pr->id->name, "ext", 3)) {
706 ckfs = e2fsck;
707 } else {
708 ULOG_ERR("check_filesystem: %s is not supported\n", pr->id->name);
709 return;
710 }
711
712 if (stat(ckfs, &statbuf) < 0) {
713 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
714 return;
715 }
716
717 pid = fork();
718 if (!pid) {
719 execl(ckfs, ckfs, "-p", pr->dev, NULL);
720 exit(-1);
721 } else if (pid > 0) {
722 int status;
723
724 waitpid(pid, &status, 0);
725 if (WEXITSTATUS(status))
726 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
727 }
728 }
729
730 static void handle_swapfiles(bool on)
731 {
732 struct stat s;
733 struct mount *m;
734 struct blkid_struct_probe *pr;
735
736 vlist_for_each_element(&mounts, m, node)
737 {
738 if (m->type != TYPE_SWAP || !m->target)
739 continue;
740
741 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
742 continue;
743
744 pr = _probe_path(m->target);
745
746 if (!pr)
747 continue;
748
749 if (!strcmp(pr->id->name, "swap")) {
750 if (on)
751 swapon(pr->dev, m->prio);
752 else
753 swapoff(pr->dev);
754 }
755
756 free(pr);
757 }
758 }
759
760 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
761 {
762 struct mount *m;
763 char *device;
764 char *mp;
765
766 if (!pr)
767 return -1;
768
769 device = basename(pr->dev);
770
771 if (!strcmp(pr->id->name, "swap")) {
772 if (hotplug && !auto_swap)
773 return -1;
774 m = find_swap(pr->uuid, pr->label, device);
775 if (m || anon_swap)
776 swapon(pr->dev, (m) ? (m->prio) : (0));
777
778 return 0;
779 }
780
781 if (hotplug && !auto_mount)
782 return -1;
783
784 mp = find_mount_point(pr->dev);
785 if (mp) {
786 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
787 free(mp);
788 return -1;
789 }
790
791 m = find_block(pr->uuid, pr->label, device, NULL);
792 if (m && m->extroot)
793 return -1;
794
795 if (m) {
796 char *target = m->target;
797 char _target[32];
798 int err = 0;
799
800 if (!target) {
801 snprintf(_target, sizeof(_target), "/mnt/%s", device);
802 target = _target;
803 }
804 mkdir_p(target);
805
806 if (check_fs)
807 check_filesystem(pr);
808
809 err = mount(pr->dev, target, pr->id->name, m->flags,
810 (m->options) ? (m->options) : (""));
811 if (err)
812 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
813 pr->dev, pr->id->name, target, err, strerror(err));
814 else
815 handle_swapfiles(true);
816 return err;
817 }
818
819 if (anon_mount) {
820 char target[32];
821 int err = 0;
822
823 snprintf(target, sizeof(target), "/mnt/%s", device);
824 mkdir_p(target);
825
826 if (check_fs)
827 check_filesystem(pr);
828
829 err = mount(pr->dev, target, pr->id->name, 0, "");
830 if (err)
831 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
832 pr->dev, pr->id->name, target, err, strerror(err));
833 else
834 handle_swapfiles(true);
835 return err;
836 }
837
838 return 0;
839 }
840
841 static int umount_device(struct blkid_struct_probe *pr)
842 {
843 struct mount *m;
844 char *device = basename(pr->dev);
845 char *mp;
846 int err;
847
848 if (!pr)
849 return -1;
850
851 if (!strcmp(pr->id->name, "swap"))
852 return -1;
853
854 mp = find_mount_point(pr->dev);
855 if (!mp)
856 return -1;
857
858 m = find_block(pr->uuid, pr->label, device, NULL);
859 if (m && m->extroot)
860 return -1;
861
862 err = umount2(mp, MNT_DETACH);
863 if (err)
864 ULOG_ERR("unmounting %s (%s) failed (%d) - %s\n",
865 pr->dev, mp, err, strerror(err));
866 else
867 ULOG_INFO("unmounted %s (%s)\n",
868 pr->dev, mp);
869
870 free(mp);
871 return err;
872 }
873
874 static int main_hotplug(int argc, char **argv)
875 {
876 char path[32];
877 char *action, *device, *mount_point;
878
879 action = getenv("ACTION");
880 device = getenv("DEVNAME");
881
882 if (!action || !device)
883 return -1;
884 snprintf(path, sizeof(path), "/dev/%s", device);
885
886 if (!strcmp(action, "remove")) {
887 int err = 0;
888 mount_point = find_mount_point(path);
889 if (mount_point)
890 err = umount2(mount_point, MNT_DETACH);
891
892 if (err)
893 ULOG_ERR("umount of %s failed (%d) - %s\n",
894 mount_point, err, strerror(err));
895
896 free(mount_point);
897 return 0;
898 } else if (strcmp(action, "add")) {
899 ULOG_ERR("Unkown action %s\n", action);
900
901 return -1;
902 }
903
904 if (config_load(NULL))
905 return -1;
906 cache_load(0);
907
908 return mount_device(find_block_info(NULL, NULL, path), 1);
909 }
910
911 static int find_block_mtd(char *name, char *part, int plen)
912 {
913 FILE *fp = fopen("/proc/mtd", "r");
914 static char line[256];
915 char *index = NULL;
916
917 if(!fp)
918 return -1;
919
920 while (!index && fgets(line, sizeof(line), fp)) {
921 if (strstr(line, name)) {
922 char *eol = strstr(line, ":");
923
924 if (!eol)
925 continue;
926
927 *eol = '\0';
928 index = &line[3];
929 }
930 }
931
932 fclose(fp);
933
934 if (!index)
935 return -1;
936
937 snprintf(part, plen, "/dev/mtdblock%s", index);
938
939 return 0;
940 }
941
942 #ifdef UBIFS_EXTROOT
943 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
944 {
945 int dev = 0;
946
947 while (ubi_dev_present(libubi, dev))
948 {
949 struct ubi_dev_info dev_info;
950 struct ubi_vol_info vol_info;
951
952 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
953 continue;
954 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
955 continue;
956
957 *dev_num = dev_info.dev_num;
958 *vol_id = vol_info.vol_id;
959
960 return 0;
961 }
962
963 return -1;
964 }
965
966 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
967 {
968 int dev_num;
969 int vol_id;
970 int err = -1;
971
972 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
973 if (!err)
974 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
975
976 return err;
977 }
978
979 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
980 {
981 int dev_num;
982 int vol_id;
983 int err = -1;
984
985 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
986 if (!err)
987 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
988
989 return err;
990 }
991
992 #else
993
994 static int find_root_dev(char *buf, int len)
995 {
996 DIR *d;
997 dev_t root;
998 struct stat s;
999 struct dirent *e;
1000
1001 if (stat("/", &s))
1002 return -1;
1003
1004 if (!(d = opendir("/dev")))
1005 return -1;
1006
1007 root = s.st_dev;
1008
1009 while ((e = readdir(d)) != NULL) {
1010 snprintf(buf, len, "/dev/%s", e->d_name);
1011
1012 if (stat(buf, &s) || s.st_rdev != root)
1013 continue;
1014
1015 closedir(d);
1016 return 0;
1017 }
1018
1019 closedir(d);
1020 return -1;
1021 }
1022
1023 #endif
1024
1025 static int test_fs_support(const char *name)
1026 {
1027 char line[128], *p;
1028 int rv = -1;
1029 FILE *f;
1030
1031 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1032 while (fgets(line, sizeof(line), f)) {
1033 p = strtok(line, "\t\n");
1034
1035 if (p && !strcmp(p, "nodev"))
1036 p = strtok(NULL, "\t\n");
1037
1038 if (p && !strcmp(p, name)) {
1039 rv = 0;
1040 break;
1041 }
1042 }
1043 fclose(f);
1044 }
1045
1046 return rv;
1047 }
1048
1049 static int check_extroot(char *path)
1050 {
1051 struct blkid_struct_probe *pr = NULL;
1052 char devpath[32];
1053
1054 #ifdef UBIFS_EXTROOT
1055 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1056 int err = -1;
1057 libubi_t libubi;
1058
1059 libubi = libubi_open();
1060 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1061 libubi_close(libubi);
1062 if (err)
1063 return -1;
1064 }
1065 #else
1066 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1067 if (find_root_dev(devpath, sizeof(devpath))) {
1068 ULOG_ERR("extroot: unable to determine root device\n");
1069 return -1;
1070 }
1071 }
1072 #endif
1073
1074 list_for_each_entry(pr, &devices, list) {
1075 if (!strcmp(pr->dev, devpath)) {
1076 struct stat s;
1077 FILE *fp = NULL;
1078 char tag[64];
1079 char uuid[64] = { 0 };
1080
1081 snprintf(tag, sizeof(tag), "%s/etc", path);
1082 if (stat(tag, &s))
1083 mkdir_p(tag);
1084
1085 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1086 if (stat(tag, &s)) {
1087 fp = fopen(tag, "w+");
1088 if (!fp) {
1089 ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1090 tag, errno, strerror(errno));
1091 /* return 0 to continue boot regardless of error */
1092 return 0;
1093 }
1094 fputs(pr->uuid, fp);
1095 fclose(fp);
1096 return 0;
1097 }
1098
1099 fp = fopen(tag, "r");
1100 if (!fp) {
1101 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1102 tag, errno, strerror(errno));
1103 return -1;
1104 }
1105
1106 if (!fgets(uuid, sizeof(uuid), fp))
1107 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1108 tag, errno, strerror(errno));
1109 fclose(fp);
1110
1111 if (*uuid && !strcasecmp(uuid, pr->uuid))
1112 return 0;
1113
1114 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1115 pr->uuid, basename(path), uuid);
1116 return -1;
1117 }
1118 }
1119
1120 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1121 return -1;
1122 }
1123
1124 /*
1125 * Read info about extroot from UCI (using prefix) and mount it.
1126 */
1127 static int mount_extroot(char *cfg)
1128 {
1129 char overlay[] = "/tmp/extroot/overlay";
1130 char mnt[] = "/tmp/extroot/mnt";
1131 char *path = mnt;
1132 struct blkid_struct_probe *pr;
1133 struct mount *m;
1134 int err = -1;
1135
1136 /* Load @cfg/etc/config/fstab */
1137 if (config_load(cfg))
1138 return -2;
1139
1140 /* See if there is extroot-specific mount config */
1141 m = find_block(NULL, NULL, NULL, "/");
1142 if (!m)
1143 m = find_block(NULL, NULL, NULL, "/overlay");
1144
1145 if (!m || !m->extroot)
1146 {
1147 ULOG_INFO("extroot: not configured\n");
1148 return -1;
1149 }
1150
1151 /* Find block device pointed by the mount config */
1152 pr = find_block_info(m->uuid, m->label, m->device);
1153
1154 if (!pr && delay_root){
1155 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1156 sleep(delay_root);
1157 mkblkdev();
1158 cache_load(0);
1159 pr = find_block_info(m->uuid, m->label, m->device);
1160 }
1161 if (pr) {
1162 if (strncmp(pr->id->name, "ext", 3) &&
1163 strncmp(pr->id->name, "ubifs", 5)) {
1164 ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1165 return -1;
1166 }
1167
1168 if (test_fs_support(pr->id->name)) {
1169 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1170 return -1;
1171 }
1172
1173 if (m->overlay)
1174 path = overlay;
1175 mkdir_p(path);
1176
1177 if (check_fs)
1178 check_filesystem(pr);
1179
1180 err = mount(pr->dev, path, pr->id->name, m->flags,
1181 (m->options) ? (m->options) : (""));
1182
1183 if (err) {
1184 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1185 pr->dev, pr->id->name, path, err, strerror(err));
1186 } else if (m->overlay) {
1187 err = check_extroot(path);
1188 if (err)
1189 umount(path);
1190 }
1191 } else {
1192 ULOG_ERR("extroot: cannot find device %s%s\n",
1193 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1194 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1195 }
1196
1197 return err;
1198 }
1199
1200 static int main_extroot(int argc, char **argv)
1201 {
1202 struct blkid_struct_probe *pr;
1203 char blkdev_path[32] = { 0 };
1204 int err = -1;
1205 #ifdef UBIFS_EXTROOT
1206 libubi_t libubi;
1207 #endif
1208
1209 if (!getenv("PREINIT"))
1210 return -1;
1211
1212 if (argc != 2) {
1213 ULOG_ERR("Usage: block extroot\n");
1214 return -1;
1215 }
1216
1217 mkblkdev();
1218 cache_load(1);
1219
1220 /* enable LOG_INFO messages */
1221 ulog_threshold(LOG_INFO);
1222
1223 /*
1224 * Look for "rootfs_data". We will want to mount it and check for
1225 * extroot configuration.
1226 */
1227
1228 /* Start with looking for MTD partition */
1229 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1230 if (blkdev_path[0]) {
1231 pr = find_block_info(NULL, NULL, blkdev_path);
1232 if (pr && !strcmp(pr->id->name, "jffs2")) {
1233 char cfg[] = "/tmp/jffs_cfg";
1234
1235 /*
1236 * Mount MTD part and try extroot (using
1237 * /etc/config/fstab from that partition)
1238 */
1239 mkdir_p(cfg);
1240 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1241 err = mount_extroot(cfg);
1242 umount2(cfg, MNT_DETACH);
1243 }
1244 if (err < 0)
1245 rmdir("/tmp/overlay");
1246 rmdir(cfg);
1247 return err;
1248 }
1249 }
1250
1251 #ifdef UBIFS_EXTROOT
1252 /* ... but it also could be an UBI volume */
1253 memset(blkdev_path, 0, sizeof(blkdev_path));
1254 libubi = libubi_open();
1255 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1256 libubi_close(libubi);
1257 if (blkdev_path[0]) {
1258 char cfg[] = "/tmp/ubifs_cfg";
1259
1260 /* Mount volume and try extroot (using fstab from that vol) */
1261 mkdir_p(cfg);
1262 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1263 err = mount_extroot(cfg);
1264 umount2(cfg, MNT_DETACH);
1265 }
1266 if (err < 0)
1267 rmdir("/tmp/overlay");
1268 rmdir(cfg);
1269 return err;
1270 }
1271 #endif
1272
1273 return mount_extroot(NULL);
1274 }
1275
1276 static int main_mount(int argc, char **argv)
1277 {
1278 struct blkid_struct_probe *pr;
1279
1280 if (config_load(NULL))
1281 return -1;
1282
1283 cache_load(1);
1284 list_for_each_entry(pr, &devices, list)
1285 mount_device(pr, 0);
1286
1287 handle_swapfiles(true);
1288
1289 return 0;
1290 }
1291
1292 static int main_umount(int argc, char **argv)
1293 {
1294 struct blkid_struct_probe *pr;
1295
1296 if (config_load(NULL))
1297 return -1;
1298
1299 handle_swapfiles(false);
1300
1301 cache_load(0);
1302 list_for_each_entry(pr, &devices, list)
1303 umount_device(pr);
1304
1305 return 0;
1306 }
1307
1308 static int main_detect(int argc, char **argv)
1309 {
1310 struct blkid_struct_probe *pr;
1311
1312 cache_load(0);
1313 printf("config 'global'\n");
1314 printf("\toption\tanon_swap\t'0'\n");
1315 printf("\toption\tanon_mount\t'0'\n");
1316 printf("\toption\tauto_swap\t'1'\n");
1317 printf("\toption\tauto_mount\t'1'\n");
1318 printf("\toption\tdelay_root\t'5'\n");
1319 printf("\toption\tcheck_fs\t'0'\n\n");
1320 list_for_each_entry(pr, &devices, list)
1321 print_block_uci(pr);
1322
1323 return 0;
1324 }
1325
1326 static int main_info(int argc, char **argv)
1327 {
1328 int i;
1329 struct blkid_struct_probe *pr;
1330
1331 cache_load(1);
1332 if (argc == 2) {
1333 list_for_each_entry(pr, &devices, list)
1334 print_block_info(pr);
1335
1336 return 0;
1337 };
1338
1339 for (i = 2; i < argc; i++) {
1340 struct stat s;
1341
1342 if (stat(argv[i], &s)) {
1343 ULOG_ERR("failed to stat %s\n", argv[i]);
1344 continue;
1345 }
1346 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1347 ULOG_ERR("%s is not a block device\n", argv[i]);
1348 continue;
1349 }
1350 pr = find_block_info(NULL, NULL, argv[i]);
1351 if (pr)
1352 print_block_info(pr);
1353 }
1354
1355 return 0;
1356 }
1357
1358 static int swapon_usage(void)
1359 {
1360 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1361 "\tStart swapping on [DEVICE]\n"
1362 " -a\tStart swapping on all swap devices\n"
1363 " -p pri\tSet priority of swap device\n"
1364 " -s\tShow summary\n");
1365 return -1;
1366 }
1367
1368 static int main_swapon(int argc, char **argv)
1369 {
1370 int ch;
1371 FILE *fp;
1372 char *lineptr;
1373 size_t s;
1374 struct blkid_struct_probe *pr;
1375 int flags = 0;
1376 int pri;
1377 struct stat st;
1378 int err;
1379
1380 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1381 switch(ch) {
1382 case 's':
1383 fp = fopen("/proc/swaps", "r");
1384 lineptr = NULL;
1385
1386 if (!fp) {
1387 ULOG_ERR("failed to open /proc/swaps\n");
1388 return -1;
1389 }
1390 while (getline(&lineptr, &s, fp) > 0)
1391 printf("%s", lineptr);
1392 if (lineptr)
1393 free(lineptr);
1394 fclose(fp);
1395 return 0;
1396 case 'a':
1397 cache_load(0);
1398 list_for_each_entry(pr, &devices, list) {
1399 if (strcmp(pr->id->name, "swap"))
1400 continue;
1401 if (swapon(pr->dev, 0))
1402 ULOG_ERR("failed to swapon %s\n", pr->dev);
1403 }
1404 return 0;
1405 case 'p':
1406 pri = atoi(optarg);
1407 if (pri >= 0)
1408 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1409 break;
1410 default:
1411 return swapon_usage();
1412 }
1413
1414 }
1415
1416 if (optind != (argc - 1))
1417 return swapon_usage();
1418
1419 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1420 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1421 return -1;
1422 }
1423 err = swapon(argv[optind], flags);
1424 if (err) {
1425 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1426 return err;
1427 }
1428
1429 return 0;
1430 }
1431
1432 static int main_swapoff(int argc, char **argv)
1433 {
1434 if (argc != 2) {
1435 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1436 "\tStop swapping on DEVICE\n"
1437 " -a\tStop swapping on all swap devices\n");
1438 return -1;
1439 }
1440
1441 if (!strcmp(argv[1], "-a")) {
1442 FILE *fp = fopen("/proc/swaps", "r");
1443 char line[256];
1444
1445 if (!fp) {
1446 ULOG_ERR("failed to open /proc/swaps\n");
1447 return -1;
1448 }
1449 if (fgets(line, sizeof(line), fp))
1450 while (fgets(line, sizeof(line), fp)) {
1451 char *end = strchr(line, ' ');
1452 int err;
1453
1454 if (!end)
1455 continue;
1456 *end = '\0';
1457 err = swapoff(line);
1458 if (err)
1459 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1460 }
1461 fclose(fp);
1462 } else {
1463 struct stat s;
1464 int err;
1465
1466 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1467 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1468 return -1;
1469 }
1470 err = swapoff(argv[1]);
1471 if (err) {
1472 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1473 return err;
1474 }
1475 }
1476
1477 return 0;
1478 }
1479
1480 int main(int argc, char **argv)
1481 {
1482 char *base = basename(*argv);
1483
1484 umask(0);
1485
1486 ulog_open(-1, -1, "block");
1487 ulog_threshold(LOG_NOTICE);
1488
1489 if (!strcmp(base, "swapon"))
1490 return main_swapon(argc, argv);
1491
1492 if (!strcmp(base, "swapoff"))
1493 return main_swapoff(argc, argv);
1494
1495 if ((argc > 1) && !strcmp(base, "block")) {
1496 if (!strcmp(argv[1], "info"))
1497 return main_info(argc, argv);
1498
1499 if (!strcmp(argv[1], "detect"))
1500 return main_detect(argc, argv);
1501
1502 if (!strcmp(argv[1], "hotplug"))
1503 return main_hotplug(argc, argv);
1504
1505 if (!strcmp(argv[1], "extroot"))
1506 return main_extroot(argc, argv);
1507
1508 if (!strcmp(argv[1], "mount"))
1509 return main_mount(argc, argv);
1510
1511 if (!strcmp(argv[1], "umount"))
1512 return main_umount(argc, argv);
1513
1514 if (!strcmp(argv[1], "remount")) {
1515 int ret = main_umount(argc, argv);
1516
1517 if (!ret)
1518 ret = main_mount(argc, argv);
1519 return ret;
1520 }
1521 }
1522
1523 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1524
1525 return -1;
1526 }
OpenWrt filesystem utilities