mount: apply SELinux labels before overlayfs mount
[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 <uci.h>
33 #include <uci_blob.h>
34
35 #include <libubox/ulog.h>
36 #include <libubox/list.h>
37 #include <libubox/vlist.h>
38 #include <libubox/blobmsg_json.h>
39 #include <libubox/avl-cmp.h>
40
41 #include "libblkid-tiny/libblkid-tiny.h"
42
43 #ifdef UBIFS_EXTROOT
44 #include "libubi/libubi.h"
45 #endif
46
47 enum {
48 TYPE_MOUNT,
49 TYPE_SWAP,
50 };
51
52 struct mount {
53 struct vlist_node node;
54 int type;
55
56 char *target;
57 char *path;
58 char *options;
59 uint32_t flags;
60 char *uuid;
61 char *label;
62 char *device;
63 int extroot;
64 int overlay;
65 int disabled_fsck;
66 unsigned int prio;
67 };
68
69 static struct vlist_tree mounts;
70 static struct blob_buf b;
71 static LIST_HEAD(devices);
72 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
73 static unsigned int delay_root;
74
75 enum {
76 CFG_ANON_MOUNT,
77 CFG_ANON_SWAP,
78 CFG_AUTO_MOUNT,
79 CFG_AUTO_SWAP,
80 CFG_DELAY_ROOT,
81 CFG_CHECK_FS,
82 __CFG_MAX
83 };
84
85 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
86 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
87 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
88 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
89 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
90 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
91 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
92 };
93
94 enum {
95 MOUNT_UUID,
96 MOUNT_LABEL,
97 MOUNT_ENABLE,
98 MOUNT_TARGET,
99 MOUNT_DEVICE,
100 MOUNT_OPTIONS,
101 __MOUNT_MAX
102 };
103
104 static const struct uci_blob_param_list config_attr_list = {
105 .n_params = __CFG_MAX,
106 .params = config_policy,
107 };
108
109 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
110 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
111 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
112 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
113 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
114 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
115 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
116 };
117
118 static const struct uci_blob_param_list mount_attr_list = {
119 .n_params = __MOUNT_MAX,
120 .params = mount_policy,
121 };
122
123 enum {
124 SWAP_ENABLE,
125 SWAP_UUID,
126 SWAP_LABEL,
127 SWAP_DEVICE,
128 SWAP_PRIO,
129 __SWAP_MAX
130 };
131
132 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
133 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
134 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
135 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
136 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
137 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
138 };
139
140 static const struct uci_blob_param_list swap_attr_list = {
141 .n_params = __SWAP_MAX,
142 .params = swap_policy,
143 };
144
145 struct mount_flag {
146 const char *name;
147 int32_t flag;
148 };
149
150 #ifndef MS_DIRSYNC
151 # define MS_DIRSYNC (1 << 7)
152 #endif
153
154 #ifndef MS_RELATIME
155 # define MS_RELATIME (1 << 21)
156 #endif
157
158 #ifndef MS_STRICTATIME
159 # define MS_STRICTATIME (1 << 24)
160 #endif
161
162 static const struct mount_flag mount_flags[] = {
163 { "sync", MS_SYNCHRONOUS },
164 { "async", ~MS_SYNCHRONOUS },
165 { "dirsync", MS_DIRSYNC },
166 { "mand", MS_MANDLOCK },
167 { "nomand", ~MS_MANDLOCK },
168 { "atime", ~MS_NOATIME },
169 { "noatime", MS_NOATIME },
170 { "dev", ~MS_NODEV },
171 { "nodev", MS_NODEV },
172 { "diratime", ~MS_NODIRATIME },
173 { "nodiratime", MS_NODIRATIME },
174 { "exec", ~MS_NOEXEC },
175 { "noexec", MS_NOEXEC },
176 { "suid", ~MS_NOSUID },
177 { "nosuid", MS_NOSUID },
178 { "rw", ~MS_RDONLY },
179 { "ro", MS_RDONLY },
180 { "relatime", MS_RELATIME },
181 { "norelatime", ~MS_RELATIME },
182 { "strictatime", MS_STRICTATIME },
183 };
184
185 static char *blobmsg_get_strdup(struct blob_attr *attr)
186 {
187 if (!attr)
188 return NULL;
189
190 return strdup(blobmsg_get_string(attr));
191 }
192
193 static char *blobmsg_get_basename(struct blob_attr *attr)
194 {
195 if (!attr)
196 return NULL;
197
198 return strdup(basename(blobmsg_get_string(attr)));
199 }
200
201 static void parse_mount_options(struct mount *m, char *optstr)
202 {
203 int i;
204 bool is_flag;
205 char *p, *opts, *last;
206
207 m->flags = 0;
208 m->options = NULL;
209
210 if (!optstr || !*optstr)
211 return;
212
213 m->options = opts = calloc(1, strlen(optstr) + 1);
214
215 if (!m->options)
216 return;
217
218 p = last = optstr;
219
220 do {
221 p = strchr(p, ',');
222
223 if (p)
224 *p++ = 0;
225
226 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
227 if (!strcmp(last, mount_flags[i].name)) {
228 if (mount_flags[i].flag < 0)
229 m->flags &= (uint32_t)mount_flags[i].flag;
230 else
231 m->flags |= (uint32_t)mount_flags[i].flag;
232 is_flag = true;
233 break;
234 }
235 }
236
237 if (!is_flag)
238 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
239
240 last = p;
241
242 } while (p);
243
244 free(optstr);
245 }
246
247 static int mount_add(struct uci_section *s)
248 {
249 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
250 struct mount *m;
251
252 blob_buf_init(&b, 0);
253 uci_to_blob(&b, s, &mount_attr_list);
254 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
255
256 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
257 return -1;
258
259 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
260 return -1;
261
262 m = malloc(sizeof(struct mount));
263 m->type = TYPE_MOUNT;
264 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
265 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
266 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
267 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
268
269 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
270
271 m->overlay = m->extroot = 0;
272 if (m->target && !strcmp(m->target, "/"))
273 m->extroot = 1;
274 if (m->target && !strcmp(m->target, "/overlay"))
275 m->extroot = m->overlay = 1;
276
277 if (m->target && *m->target != '/') {
278 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
279 s->e.name, m->target);
280 free(m);
281 return -1;
282 }
283
284 if (m->uuid)
285 vlist_add(&mounts, &m->node, m->uuid);
286 else if (m->label)
287 vlist_add(&mounts, &m->node, m->label);
288 else if (m->device)
289 vlist_add(&mounts, &m->node, m->device);
290
291 return 0;
292 }
293
294 static int swap_add(struct uci_section *s)
295 {
296 struct blob_attr *tb[__SWAP_MAX] = { 0 };
297 struct mount *m;
298
299 blob_buf_init(&b, 0);
300 uci_to_blob(&b, s, &swap_attr_list);
301 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
302
303 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
304 return -1;
305
306 m = malloc(sizeof(struct mount));
307 memset(m, 0, sizeof(struct mount));
308 m->type = TYPE_SWAP;
309 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
310 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
311 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
312 if (tb[SWAP_PRIO])
313 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
314 if (m->prio)
315 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
316
317 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
318 /* store complete swap path */
319 if (tb[SWAP_DEVICE])
320 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
321
322 if (m->uuid)
323 vlist_add(&mounts, &m->node, m->uuid);
324 else if (m->label)
325 vlist_add(&mounts, &m->node, m->label);
326 else if (m->device)
327 vlist_add(&mounts, &m->node, m->device);
328 }
329
330 return 0;
331 }
332
333 static int global_add(struct uci_section *s)
334 {
335 struct blob_attr *tb[__CFG_MAX] = { 0 };
336
337 blob_buf_init(&b, 0);
338 uci_to_blob(&b, s, &config_attr_list);
339 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
340
341 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
342 anon_mount = 1;
343 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
344 anon_swap = 1;
345
346 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
347 auto_mount = 1;
348 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
349 auto_swap = 1;
350
351 if (tb[CFG_DELAY_ROOT])
352 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
353
354 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
355 check_fs = 1;
356
357 return 0;
358 }
359
360 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
361 {
362 struct mount *m;
363
364 vlist_for_each_element(&mounts, m, node) {
365 if (m->type != TYPE_SWAP)
366 continue;
367 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
368 return m;
369 if (label && m->label && !strcmp(m->label, label))
370 return m;
371 if (device && m->device && !strcmp(m->device, device))
372 return m;
373 }
374
375 return NULL;
376 }
377
378 static struct mount* find_block(const char *uuid, const char *label, const char *device,
379 const char *target)
380 {
381 struct mount *m;
382
383 vlist_for_each_element(&mounts, m, node) {
384 if (m->type != TYPE_MOUNT)
385 continue;
386 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
387 return m;
388 if (m->label && label && !strcmp(m->label, label))
389 return m;
390 if (m->target && target && !strcmp(m->target, target))
391 return m;
392 if (m->device && device && !strcmp(m->device, device))
393 return m;
394 }
395
396 return NULL;
397 }
398
399 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
400 struct vlist_node *node_old)
401 {
402 }
403
404 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
405 {
406 char *file = basename(path);
407 char *dir = dirname(path);
408 char *err;
409 struct uci_package *pkg;
410
411 uci_set_confdir(ctx, dir);
412 ULOG_INFO("attempting to load %s/%s\n", dir, file);
413
414 if (uci_load(ctx, file, &pkg)) {
415 uci_get_errorstr(ctx, &err, file);
416 ULOG_ERR("unable to load configuration (%s)\n", err);
417
418 free(err);
419 return NULL;
420 }
421
422 return pkg;
423 }
424
425 static int config_load(char *cfg)
426 {
427 struct uci_context *ctx = uci_alloc_context();
428 struct uci_package *pkg = NULL;
429 struct uci_element *e;
430 char path[64];
431
432 vlist_init(&mounts, avl_strcmp, mounts_update);
433
434 if (cfg) {
435 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
436 pkg = config_try_load(ctx, path);
437
438 if (!pkg) {
439 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
440 pkg = config_try_load(ctx, path);
441 }
442 }
443
444 if (!pkg) {
445 snprintf(path, sizeof(path), "/etc/config/fstab");
446 pkg = config_try_load(ctx, path);
447 }
448
449 if (!pkg) {
450 ULOG_ERR("no usable configuration\n");
451 return -1;
452 }
453
454 vlist_update(&mounts);
455 uci_foreach_element(&pkg->sections, e) {
456 struct uci_section *s = uci_to_section(e);
457
458 if (!strcmp(s->type, "mount"))
459 mount_add(s);
460 if (!strcmp(s->type, "swap"))
461 swap_add(s);
462 if (!strcmp(s->type, "global"))
463 global_add(s);
464 }
465 vlist_flush(&mounts);
466
467 return 0;
468 }
469
470 static struct blkid_struct_probe* _probe_path(char *path)
471 {
472 struct blkid_struct_probe *pr;
473
474 pr = malloc(sizeof(*pr));
475
476 if (!pr)
477 return NULL;
478
479 memset(pr, 0, sizeof(*pr));
480 probe_block(path, pr);
481
482 if (pr->err || !pr->id) {
483 free(pr);
484 return NULL;
485 }
486
487 return pr;
488 }
489
490 static int _cache_load(const char *path)
491 {
492 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
493 int j;
494 glob_t gl;
495
496 if (glob(path, gl_flags, NULL, &gl) < 0)
497 return -1;
498
499 for (j = 0; j < gl.gl_pathc; j++) {
500 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
501 if (pr)
502 list_add_tail(&pr->list, &devices);
503 }
504
505 globfree(&gl);
506
507 return 0;
508 }
509
510 static void cache_load(int mtd)
511 {
512 if (mtd) {
513 _cache_load("/dev/mtdblock*");
514 _cache_load("/dev/ubiblock*");
515 _cache_load("/dev/ubi?*_?*");
516 }
517 _cache_load("/dev/mmcblk*");
518 _cache_load("/dev/sd*");
519 _cache_load("/dev/hd*");
520 _cache_load("/dev/md*");
521 _cache_load("/dev/vd*");
522 _cache_load("/dev/mapper/*");
523 }
524
525 static int print_block_info(struct blkid_struct_probe *pr)
526 {
527 printf("%s:", pr->dev);
528 if (pr->uuid[0])
529 printf(" UUID=\"%s\"", pr->uuid);
530
531 if (pr->label[0])
532 printf(" LABEL=\"%s\"", pr->label);
533
534 if (pr->name[0])
535 printf(" NAME=\"%s\"", pr->name);
536
537 if (pr->version[0])
538 printf(" VERSION=\"%s\"", pr->version);
539
540 printf(" TYPE=\"%s\"\n", pr->id->name);
541
542 return 0;
543 }
544
545 static int print_block_uci(struct blkid_struct_probe *pr)
546 {
547 if (!strcmp(pr->id->name, "swap")) {
548 printf("config 'swap'\n");
549 } else {
550 printf("config 'mount'\n");
551 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
552 }
553 if (pr->uuid[0])
554 printf("\toption\tuuid\t'%s'\n", pr->uuid);
555 else
556 printf("\toption\tdevice\t'%s'\n", pr->dev);
557 printf("\toption\tenabled\t'0'\n\n");
558
559 return 0;
560 }
561
562 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
563 {
564 struct blkid_struct_probe *pr = NULL;
565
566 if (uuid)
567 list_for_each_entry(pr, &devices, list)
568 if (!strcasecmp(pr->uuid, uuid))
569 return pr;
570
571 if (label)
572 list_for_each_entry(pr, &devices, list)
573 if (!strcmp(pr->label, label))
574 return pr;
575
576 if (path)
577 list_for_each_entry(pr, &devices, list)
578 if (!strcmp(basename(pr->dev), basename(path)))
579 return pr;
580
581 return NULL;
582 }
583
584 static char* find_mount_point(char *block)
585 {
586 FILE *fp = fopen("/proc/mounts", "r");
587 static char line[256];
588 int len = strlen(block);
589 char *point = NULL;
590
591 if(!fp)
592 return NULL;
593
594 while (fgets(line, sizeof(line), fp)) {
595 if (!strncmp(line, block, len)) {
596 char *p = &line[len + 1];
597 char *t = strstr(p, " ");
598
599 if (!t) {
600 fclose(fp);
601 return NULL;
602 }
603 *t = '\0';
604 point = p;
605 break;
606 }
607 }
608
609 fclose(fp);
610
611 return point;
612 }
613
614 static void mkdir_p(char *dir)
615 {
616 char *l = strrchr(dir, '/');
617
618 if (l) {
619 *l = '\0';
620 mkdir_p(dir);
621 *l = '/';
622 mkdir(dir, 0755);
623 }
624 }
625
626 static void check_filesystem(struct blkid_struct_probe *pr)
627 {
628 pid_t pid;
629 struct stat statbuf;
630 char *e2fsck = "/usr/sbin/e2fsck";
631
632 /* UBIFS does not need stuff like fsck */
633 if (!strncmp(pr->id->name, "ubifs", 5))
634 return;
635
636 if (strncmp(pr->id->name, "ext", 3)) {
637 ULOG_ERR("check_filesystem: %s is not supported\n", pr->id->name);
638 return;
639 }
640
641 if (stat(e2fsck, &statbuf) < 0) {
642 ULOG_ERR("check_filesystem: %s not found\n", e2fsck);
643 return;
644 }
645
646 pid = fork();
647 if (!pid) {
648 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
649 exit(-1);
650 } else if (pid > 0) {
651 int status;
652
653 waitpid(pid, &status, 0);
654 if (WEXITSTATUS(status))
655 ULOG_ERR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
656 }
657 }
658
659 static void handle_swapfiles(bool on)
660 {
661 struct stat s;
662 struct mount *m;
663 struct blkid_struct_probe *pr;
664
665 vlist_for_each_element(&mounts, m, node)
666 {
667 if (m->type != TYPE_SWAP || !m->target)
668 continue;
669
670 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
671 continue;
672
673 pr = _probe_path(m->target);
674
675 if (!pr)
676 continue;
677
678 if (!strcmp(pr->id->name, "swap")) {
679 if (on)
680 swapon(pr->dev, m->prio);
681 else
682 swapoff(pr->dev);
683 }
684
685 free(pr);
686 }
687 }
688
689 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
690 {
691 struct mount *m;
692 char *device;
693
694 if (!pr)
695 return -1;
696
697 device = basename(pr->dev);
698
699 if (!strcmp(pr->id->name, "swap")) {
700 if (hotplug && !auto_swap)
701 return -1;
702 m = find_swap(pr->uuid, pr->label, device);
703 if (m || anon_swap)
704 swapon(pr->dev, (m) ? (m->prio) : (0));
705
706 return 0;
707 }
708
709 if (hotplug && !auto_mount)
710 return -1;
711
712 if (find_mount_point(pr->dev)) {
713 ULOG_ERR("%s is already mounted\n", pr->dev);
714 return -1;
715 }
716
717 m = find_block(pr->uuid, pr->label, device, NULL);
718 if (m && m->extroot)
719 return -1;
720
721 if (m) {
722 char *target = m->target;
723 char _target[32];
724 int err = 0;
725
726 if (!target) {
727 snprintf(_target, sizeof(_target), "/mnt/%s", device);
728 target = _target;
729 }
730 mkdir_p(target);
731
732 if (check_fs)
733 check_filesystem(pr);
734
735 err = mount(pr->dev, target, pr->id->name, m->flags,
736 (m->options) ? (m->options) : (""));
737 if (err)
738 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
739 pr->dev, pr->id->name, target, err, strerror(err));
740 else
741 handle_swapfiles(true);
742 return err;
743 }
744
745 if (anon_mount) {
746 char target[] = "/mnt/mmcblk123";
747 int err = 0;
748
749 snprintf(target, sizeof(target), "/mnt/%s", device);
750 mkdir_p(target);
751
752 if (check_fs)
753 check_filesystem(pr);
754
755 err = mount(pr->dev, target, pr->id->name, 0, "");
756 if (err)
757 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
758 pr->dev, pr->id->name, target, err, strerror(err));
759 else
760 handle_swapfiles(true);
761 return err;
762 }
763
764 return 0;
765 }
766
767 static int umount_device(struct blkid_struct_probe *pr)
768 {
769 struct mount *m;
770 char *device = basename(pr->dev);
771 char *mp;
772 int err;
773
774 if (!pr)
775 return -1;
776
777 if (!strcmp(pr->id->name, "swap"))
778 return -1;
779
780 mp = find_mount_point(pr->dev);
781 if (!mp)
782 return -1;
783
784 m = find_block(pr->uuid, pr->label, device, NULL);
785 if (m && m->extroot)
786 return -1;
787
788 err = umount2(mp, MNT_DETACH);
789 if (err)
790 ULOG_ERR("unmounting %s (%s) failed (%d) - %s\n",
791 pr->dev, mp, err, strerror(err));
792 else
793 ULOG_INFO("unmounted %s (%s)\n",
794 pr->dev, mp);
795
796 return err;
797 }
798
799 static int main_hotplug(int argc, char **argv)
800 {
801 char path[32];
802 char *action, *device, *mount_point;
803
804 action = getenv("ACTION");
805 device = getenv("DEVNAME");
806
807 if (!action || !device)
808 return -1;
809 snprintf(path, sizeof(path), "/dev/%s", device);
810
811 if (!strcmp(action, "remove")) {
812 int err = 0;
813 mount_point = find_mount_point(path);
814 if (mount_point)
815 err = umount2(mount_point, MNT_DETACH);
816
817 if (err)
818 ULOG_ERR("umount of %s failed (%d) - %s\n",
819 mount_point, err, strerror(err));
820
821 return 0;
822 } else if (strcmp(action, "add")) {
823 ULOG_ERR("Unkown action %s\n", action);
824
825 return -1;
826 }
827
828 if (config_load(NULL))
829 return -1;
830 cache_load(0);
831
832 return mount_device(find_block_info(NULL, NULL, path), 1);
833 }
834
835 static int find_block_mtd(char *name, char *part, int plen)
836 {
837 FILE *fp = fopen("/proc/mtd", "r");
838 static char line[256];
839 char *index = NULL;
840
841 if(!fp)
842 return -1;
843
844 while (!index && fgets(line, sizeof(line), fp)) {
845 if (strstr(line, name)) {
846 char *eol = strstr(line, ":");
847
848 if (!eol)
849 continue;
850
851 *eol = '\0';
852 index = &line[3];
853 }
854 }
855
856 fclose(fp);
857
858 if (!index)
859 return -1;
860
861 snprintf(part, plen, "/dev/mtdblock%s", index);
862
863 return 0;
864 }
865
866 #ifdef UBIFS_EXTROOT
867 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
868 {
869 int dev = 0;
870
871 while (ubi_dev_present(libubi, dev))
872 {
873 struct ubi_dev_info dev_info;
874 struct ubi_vol_info vol_info;
875
876 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
877 continue;
878 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
879 continue;
880
881 *dev_num = dev_info.dev_num;
882 *vol_id = vol_info.vol_id;
883
884 return 0;
885 }
886
887 return -1;
888 }
889
890 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
891 {
892 int dev_num;
893 int vol_id;
894 int err = -1;
895
896 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
897 if (!err)
898 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
899
900 return err;
901 }
902
903 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
904 {
905 int dev_num;
906 int vol_id;
907 int err = -1;
908
909 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
910 if (!err)
911 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
912
913 return err;
914 }
915
916 #else
917
918 static int find_root_dev(char *buf, int len)
919 {
920 DIR *d;
921 dev_t root;
922 struct stat s;
923 struct dirent *e;
924
925 if (stat("/", &s))
926 return -1;
927
928 if (!(d = opendir("/dev")))
929 return -1;
930
931 root = s.st_dev;
932
933 while ((e = readdir(d)) != NULL) {
934 snprintf(buf, len, "/dev/%s", e->d_name);
935
936 if (stat(buf, &s) || s.st_rdev != root)
937 continue;
938
939 closedir(d);
940 return 0;
941 }
942
943 closedir(d);
944 return -1;
945 }
946
947 #endif
948
949 static int test_fs_support(const char *name)
950 {
951 char line[128], *p;
952 int rv = -1;
953 FILE *f;
954
955 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
956 while (fgets(line, sizeof(line), f)) {
957 p = strtok(line, "\t\n");
958
959 if (p && !strcmp(p, "nodev"))
960 p = strtok(NULL, "\t\n");
961
962 if (p && !strcmp(p, name)) {
963 rv = 0;
964 break;
965 }
966 }
967 fclose(f);
968 }
969
970 return rv;
971 }
972
973 static int check_extroot(char *path)
974 {
975 struct blkid_struct_probe *pr = NULL;
976 char devpath[32];
977
978 #ifdef UBIFS_EXTROOT
979 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
980 int err = -1;
981 libubi_t libubi;
982
983 libubi = libubi_open();
984 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
985 libubi_close(libubi);
986 if (err)
987 return -1;
988 }
989 #else
990 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
991 if (find_root_dev(devpath, sizeof(devpath))) {
992 ULOG_ERR("extroot: unable to determine root device\n");
993 return -1;
994 }
995 }
996 #endif
997
998 list_for_each_entry(pr, &devices, list) {
999 if (!strcmp(pr->dev, devpath)) {
1000 struct stat s;
1001 FILE *fp = NULL;
1002 char tag[64];
1003 char uuid[64] = { 0 };
1004
1005 snprintf(tag, sizeof(tag), "%s/etc", path);
1006 if (stat(tag, &s))
1007 mkdir_p(tag);
1008
1009 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1010 if (stat(tag, &s)) {
1011 fp = fopen(tag, "w+");
1012 if (!fp) {
1013 ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1014 tag, errno, strerror(errno));
1015 /* return 0 to continue boot regardless of error */
1016 return 0;
1017 }
1018 fputs(pr->uuid, fp);
1019 fclose(fp);
1020 return 0;
1021 }
1022
1023 fp = fopen(tag, "r");
1024 if (!fp) {
1025 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1026 tag, errno, strerror(errno));
1027 return -1;
1028 }
1029
1030 if (!fgets(uuid, sizeof(uuid), fp))
1031 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1032 tag, errno, strerror(errno));
1033 fclose(fp);
1034
1035 if (*uuid || !strcasecmp(uuid, pr->uuid))
1036 return 0;
1037
1038 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1039 pr->uuid, basename(path), uuid);
1040 return -1;
1041 }
1042 }
1043
1044 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1045 return -1;
1046 }
1047
1048 /*
1049 * Read info about extroot from UCI (using prefix) and mount it.
1050 */
1051 static int mount_extroot(char *cfg)
1052 {
1053 char overlay[] = "/tmp/extroot/overlay";
1054 char mnt[] = "/tmp/extroot/mnt";
1055 char *path = mnt;
1056 struct blkid_struct_probe *pr;
1057 struct mount *m;
1058 int err = -1;
1059
1060 /* Load @cfg/etc/config/fstab */
1061 if (config_load(cfg))
1062 return -2;
1063
1064 /* See if there is extroot-specific mount config */
1065 m = find_block(NULL, NULL, NULL, "/");
1066 if (!m)
1067 m = find_block(NULL, NULL, NULL, "/overlay");
1068
1069 if (!m || !m->extroot)
1070 {
1071 ULOG_INFO("extroot: not configured\n");
1072 return -1;
1073 }
1074
1075 /* Find block device pointed by the mount config */
1076 pr = find_block_info(m->uuid, m->label, m->device);
1077
1078 if (!pr && delay_root){
1079 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1080 sleep(delay_root);
1081 mkblkdev();
1082 cache_load(0);
1083 pr = find_block_info(m->uuid, m->label, m->device);
1084 }
1085 if (pr) {
1086 if (strncmp(pr->id->name, "ext", 3) &&
1087 strncmp(pr->id->name, "ubifs", 5)) {
1088 ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1089 return -1;
1090 }
1091
1092 if (test_fs_support(pr->id->name)) {
1093 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1094 return -1;
1095 }
1096
1097 if (m->overlay)
1098 path = overlay;
1099 mkdir_p(path);
1100
1101 if (check_fs)
1102 check_filesystem(pr);
1103
1104 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
1105
1106 if (err) {
1107 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1108 pr->dev, pr->id->name, path, err, strerror(err));
1109 } else if (m->overlay) {
1110 err = check_extroot(path);
1111 if (err)
1112 umount(path);
1113 }
1114 } else {
1115 ULOG_ERR("extroot: cannot find device %s%s\n",
1116 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1117 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1118 }
1119
1120 return err;
1121 }
1122
1123 static int main_extroot(int argc, char **argv)
1124 {
1125 struct blkid_struct_probe *pr;
1126 char blkdev_path[32] = { 0 };
1127 int err = -1;
1128 #ifdef UBIFS_EXTROOT
1129 libubi_t libubi;
1130 #endif
1131
1132 if (!getenv("PREINIT"))
1133 return -1;
1134
1135 if (argc != 2) {
1136 ULOG_ERR("Usage: block extroot\n");
1137 return -1;
1138 }
1139
1140 mkblkdev();
1141 cache_load(1);
1142
1143 /* enable LOG_INFO messages */
1144 ulog_threshold(LOG_INFO);
1145
1146 /*
1147 * Look for "rootfs_data". We will want to mount it and check for
1148 * extroot configuration.
1149 */
1150
1151 /* Start with looking for MTD partition */
1152 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1153 if (blkdev_path[0]) {
1154 pr = find_block_info(NULL, NULL, blkdev_path);
1155 if (pr && !strcmp(pr->id->name, "jffs2")) {
1156 char cfg[] = "/tmp/jffs_cfg";
1157
1158 /*
1159 * Mount MTD part and try extroot (using
1160 * /etc/config/fstab from that partition)
1161 */
1162 mkdir_p(cfg);
1163 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1164 err = mount_extroot(cfg);
1165 umount2(cfg, MNT_DETACH);
1166 }
1167 if (err < 0)
1168 rmdir("/tmp/overlay");
1169 rmdir(cfg);
1170 return err;
1171 }
1172 }
1173
1174 #ifdef UBIFS_EXTROOT
1175 /* ... but it also could be an UBI volume */
1176 memset(blkdev_path, 0, sizeof(blkdev_path));
1177 libubi = libubi_open();
1178 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1179 libubi_close(libubi);
1180 if (blkdev_path[0]) {
1181 char cfg[] = "/tmp/ubifs_cfg";
1182
1183 /* Mount volume and try extroot (using fstab from that vol) */
1184 mkdir_p(cfg);
1185 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1186 err = mount_extroot(cfg);
1187 umount2(cfg, MNT_DETACH);
1188 }
1189 if (err < 0)
1190 rmdir("/tmp/overlay");
1191 rmdir(cfg);
1192 return err;
1193 }
1194 #endif
1195
1196 return mount_extroot(NULL);
1197 }
1198
1199 static int main_mount(int argc, char **argv)
1200 {
1201 struct blkid_struct_probe *pr;
1202
1203 if (config_load(NULL))
1204 return -1;
1205
1206 cache_load(1);
1207 list_for_each_entry(pr, &devices, list)
1208 mount_device(pr, 0);
1209
1210 handle_swapfiles(true);
1211
1212 return 0;
1213 }
1214
1215 static int main_umount(int argc, char **argv)
1216 {
1217 struct blkid_struct_probe *pr;
1218
1219 if (config_load(NULL))
1220 return -1;
1221
1222 handle_swapfiles(false);
1223
1224 cache_load(0);
1225 list_for_each_entry(pr, &devices, list)
1226 umount_device(pr);
1227
1228 return 0;
1229 }
1230
1231 static int main_detect(int argc, char **argv)
1232 {
1233 struct blkid_struct_probe *pr;
1234
1235 cache_load(0);
1236 printf("config 'global'\n");
1237 printf("\toption\tanon_swap\t'0'\n");
1238 printf("\toption\tanon_mount\t'0'\n");
1239 printf("\toption\tauto_swap\t'1'\n");
1240 printf("\toption\tauto_mount\t'1'\n");
1241 printf("\toption\tdelay_root\t'5'\n");
1242 printf("\toption\tcheck_fs\t'0'\n\n");
1243 list_for_each_entry(pr, &devices, list)
1244 print_block_uci(pr);
1245
1246 return 0;
1247 }
1248
1249 static int main_info(int argc, char **argv)
1250 {
1251 int i;
1252 struct blkid_struct_probe *pr;
1253
1254 cache_load(1);
1255 if (argc == 2) {
1256 list_for_each_entry(pr, &devices, list)
1257 print_block_info(pr);
1258
1259 return 0;
1260 };
1261
1262 for (i = 2; i < argc; i++) {
1263 struct stat s;
1264
1265 if (stat(argv[i], &s)) {
1266 ULOG_ERR("failed to stat %s\n", argv[i]);
1267 continue;
1268 }
1269 if (!S_ISBLK(s.st_mode)) {
1270 ULOG_ERR("%s is not a block device\n", argv[i]);
1271 continue;
1272 }
1273 pr = find_block_info(NULL, NULL, argv[i]);
1274 if (pr)
1275 print_block_info(pr);
1276 }
1277
1278 return 0;
1279 }
1280
1281 static int swapon_usage(void)
1282 {
1283 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1284 "\tStart swapping on [DEVICE]\n"
1285 " -a\tStart swapping on all swap devices\n"
1286 " -p pri\tSet priority of swap device\n"
1287 " -s\tShow summary\n");
1288 return -1;
1289 }
1290
1291 static int main_swapon(int argc, char **argv)
1292 {
1293 int ch;
1294 FILE *fp;
1295 char *lineptr;
1296 size_t s;
1297 struct blkid_struct_probe *pr;
1298 int flags = 0;
1299 int pri;
1300 struct stat st;
1301 int err;
1302
1303 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1304 switch(ch) {
1305 case 's':
1306 fp = fopen("/proc/swaps", "r");
1307 lineptr = NULL;
1308
1309 if (!fp) {
1310 ULOG_ERR("failed to open /proc/swaps\n");
1311 return -1;
1312 }
1313 while (getline(&lineptr, &s, fp) > 0)
1314 printf("%s", lineptr);
1315 if (lineptr)
1316 free(lineptr);
1317 fclose(fp);
1318 return 0;
1319 case 'a':
1320 cache_load(0);
1321 list_for_each_entry(pr, &devices, list) {
1322 if (strcmp(pr->id->name, "swap"))
1323 continue;
1324 if (swapon(pr->dev, 0))
1325 ULOG_ERR("failed to swapon %s\n", pr->dev);
1326 }
1327 return 0;
1328 case 'p':
1329 pri = atoi(optarg);
1330 if (pri >= 0)
1331 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1332 break;
1333 default:
1334 return swapon_usage();
1335 }
1336
1337 }
1338
1339 if (optind != (argc - 1))
1340 return swapon_usage();
1341
1342 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1343 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1344 return -1;
1345 }
1346 err = swapon(argv[optind], flags);
1347 if (err) {
1348 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1349 return err;
1350 }
1351
1352 return 0;
1353 }
1354
1355 static int main_swapoff(int argc, char **argv)
1356 {
1357 if (argc != 2) {
1358 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1359 "\tStop swapping on DEVICE\n"
1360 " -a\tStop swapping on all swap devices\n");
1361 return -1;
1362 }
1363
1364 if (!strcmp(argv[1], "-a")) {
1365 FILE *fp = fopen("/proc/swaps", "r");
1366 char line[256];
1367
1368 if (!fp) {
1369 ULOG_ERR("failed to open /proc/swaps\n");
1370 return -1;
1371 }
1372 if (fgets(line, sizeof(line), fp))
1373 while (fgets(line, sizeof(line), fp)) {
1374 char *end = strchr(line, ' ');
1375 int err;
1376
1377 if (!end)
1378 continue;
1379 *end = '\0';
1380 err = swapoff(line);
1381 if (err)
1382 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1383 }
1384 fclose(fp);
1385 } else {
1386 struct stat s;
1387 int err;
1388
1389 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1390 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1391 return -1;
1392 }
1393 err = swapoff(argv[1]);
1394 if (err) {
1395 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1396 return err;
1397 }
1398 }
1399
1400 return 0;
1401 }
1402
1403 int main(int argc, char **argv)
1404 {
1405 char *base = basename(*argv);
1406
1407 umask(0);
1408
1409 ulog_open(-1, -1, "block");
1410 ulog_threshold(LOG_NOTICE);
1411
1412 if (!strcmp(base, "swapon"))
1413 return main_swapon(argc, argv);
1414
1415 if (!strcmp(base, "swapoff"))
1416 return main_swapoff(argc, argv);
1417
1418 if ((argc > 1) && !strcmp(base, "block")) {
1419 if (!strcmp(argv[1], "info"))
1420 return main_info(argc, argv);
1421
1422 if (!strcmp(argv[1], "detect"))
1423 return main_detect(argc, argv);
1424
1425 if (!strcmp(argv[1], "hotplug"))
1426 return main_hotplug(argc, argv);
1427
1428 if (!strcmp(argv[1], "extroot"))
1429 return main_extroot(argc, argv);
1430
1431 if (!strcmp(argv[1], "mount"))
1432 return main_mount(argc, argv);
1433
1434 if (!strcmp(argv[1], "umount"))
1435 return main_umount(argc, argv);
1436 }
1437
1438 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1439
1440 return -1;
1441 }