Contents of /trunk/mkinitrd-magellan/busybox/util-linux/mount.c
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Sun May 30 11:32:42 2010 UTC (14 years, 3 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 3 months ago) by niro
File MIME type: text/plain
File size: 52721 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini mount implementation for busybox |
4 | * |
5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
7 | * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net> |
8 | * |
9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
10 | */ |
11 | // Design notes: There is no spec for mount. Remind me to write one. |
12 | // |
13 | // mount_main() calls singlemount() which calls mount_it_now(). |
14 | // |
15 | // mount_main() can loop through /etc/fstab for mount -a |
16 | // singlemount() can loop through /etc/filesystems for fstype detection. |
17 | // mount_it_now() does the actual mount. |
18 | // |
19 | #include <mntent.h> |
20 | #include <syslog.h> |
21 | #include <sys/mount.h> |
22 | // Grab more as needed from util-linux's mount/mount_constants.h |
23 | #ifndef MS_DIRSYNC |
24 | # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous |
25 | #endif |
26 | #ifndef MS_UNION |
27 | # define MS_UNION (1 << 8) |
28 | #endif |
29 | #ifndef MS_BIND |
30 | # define MS_BIND (1 << 12) |
31 | #endif |
32 | #ifndef MS_MOVE |
33 | # define MS_MOVE (1 << 13) |
34 | #endif |
35 | #ifndef MS_RECURSIVE |
36 | # define MS_RECURSIVE (1 << 14) |
37 | #endif |
38 | #ifndef MS_SILENT |
39 | # define MS_SILENT (1 << 15) |
40 | #endif |
41 | // The shared subtree stuff, which went in around 2.6.15 |
42 | #ifndef MS_UNBINDABLE |
43 | # define MS_UNBINDABLE (1 << 17) |
44 | #endif |
45 | #ifndef MS_PRIVATE |
46 | # define MS_PRIVATE (1 << 18) |
47 | #endif |
48 | #ifndef MS_SLAVE |
49 | # define MS_SLAVE (1 << 19) |
50 | #endif |
51 | #ifndef MS_SHARED |
52 | # define MS_SHARED (1 << 20) |
53 | #endif |
54 | #ifndef MS_RELATIME |
55 | # define MS_RELATIME (1 << 21) |
56 | #endif |
57 | |
58 | #include "libbb.h" |
59 | #if ENABLE_FEATURE_MOUNT_LABEL |
60 | # include "volume_id.h" |
61 | #else |
62 | # define resolve_mount_spec(fsname) ((void)0) |
63 | #endif |
64 | |
65 | // Needed for nfs support only |
66 | #include <sys/utsname.h> |
67 | #undef TRUE |
68 | #undef FALSE |
69 | #if ENABLE_FEATURE_MOUNT_NFS |
70 | /* This is just a warning of a common mistake. Possibly this should be a |
71 | * uclibc faq entry rather than in busybox... */ |
72 | # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__) |
73 | # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support" |
74 | # endif |
75 | # include <rpc/rpc.h> |
76 | # include <rpc/pmap_prot.h> |
77 | # include <rpc/pmap_clnt.h> |
78 | #endif |
79 | |
80 | |
81 | #if defined(__dietlibc__) |
82 | // 16.12.2006, Sampo Kellomaki (sampo@iki.fi) |
83 | // dietlibc-0.30 does not have implementation of getmntent_r() |
84 | static struct mntent *getmntent_r(FILE* stream, struct mntent* result, |
85 | char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM) |
86 | { |
87 | struct mntent* ment = getmntent(stream); |
88 | return memcpy(result, ment, sizeof(*ment)); |
89 | } |
90 | #endif |
91 | |
92 | |
93 | // Not real flags, but we want to be able to check for this. |
94 | enum { |
95 | MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP, |
96 | MOUNT_NOAUTO = (1 << 29), |
97 | MOUNT_SWAP = (1 << 30), |
98 | }; |
99 | |
100 | |
101 | #define OPTION_STR "o:t:rwanfvsiO:" |
102 | enum { |
103 | OPT_o = (1 << 0), |
104 | OPT_t = (1 << 1), |
105 | OPT_r = (1 << 2), |
106 | OPT_w = (1 << 3), |
107 | OPT_a = (1 << 4), |
108 | OPT_n = (1 << 5), |
109 | OPT_f = (1 << 6), |
110 | OPT_v = (1 << 7), |
111 | OPT_s = (1 << 8), |
112 | OPT_i = (1 << 9), |
113 | OPT_O = (1 << 10), |
114 | }; |
115 | |
116 | #if ENABLE_FEATURE_MTAB_SUPPORT |
117 | #define USE_MTAB (!(option_mask32 & OPT_n)) |
118 | #else |
119 | #define USE_MTAB 0 |
120 | #endif |
121 | |
122 | #if ENABLE_FEATURE_MOUNT_FAKE |
123 | #define FAKE_IT (option_mask32 & OPT_f) |
124 | #else |
125 | #define FAKE_IT 0 |
126 | #endif |
127 | |
128 | #if ENABLE_FEATURE_MOUNT_HELPERS |
129 | #define HELPERS_ALLOWED (!(option_mask32 & OPT_i)) |
130 | #else |
131 | #define HELPERS_ALLOWED 0 |
132 | #endif |
133 | |
134 | |
135 | // TODO: more "user" flag compatibility. |
136 | // "user" option (from mount manpage): |
137 | // Only the user that mounted a filesystem can unmount it again. |
138 | // If any user should be able to unmount, then use users instead of user |
139 | // in the fstab line. The owner option is similar to the user option, |
140 | // with the restriction that the user must be the owner of the special file. |
141 | // This may be useful e.g. for /dev/fd if a login script makes |
142 | // the console user owner of this device. |
143 | |
144 | // Standard mount options (from -o options or --options), |
145 | // with corresponding flags |
146 | static const int32_t mount_options[] = { |
147 | // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. |
148 | |
149 | IF_FEATURE_MOUNT_LOOP( |
150 | /* "loop" */ 0, |
151 | ) |
152 | |
153 | IF_FEATURE_MOUNT_FSTAB( |
154 | /* "defaults" */ 0, |
155 | /* "quiet" 0 - do not filter out, vfat wants to see it */ |
156 | /* "noauto" */ MOUNT_NOAUTO, |
157 | /* "sw" */ MOUNT_SWAP, |
158 | /* "swap" */ MOUNT_SWAP, |
159 | IF_DESKTOP(/* "user" */ MOUNT_USERS,) |
160 | IF_DESKTOP(/* "users" */ MOUNT_USERS,) |
161 | /* "_netdev" */ 0, |
162 | ) |
163 | |
164 | IF_FEATURE_MOUNT_FLAGS( |
165 | // vfs flags |
166 | /* "nosuid" */ MS_NOSUID, |
167 | /* "suid" */ ~MS_NOSUID, |
168 | /* "dev" */ ~MS_NODEV, |
169 | /* "nodev" */ MS_NODEV, |
170 | /* "exec" */ ~MS_NOEXEC, |
171 | /* "noexec" */ MS_NOEXEC, |
172 | /* "sync" */ MS_SYNCHRONOUS, |
173 | /* "dirsync" */ MS_DIRSYNC, |
174 | /* "async" */ ~MS_SYNCHRONOUS, |
175 | /* "atime" */ ~MS_NOATIME, |
176 | /* "noatime" */ MS_NOATIME, |
177 | /* "diratime" */ ~MS_NODIRATIME, |
178 | /* "nodiratime" */ MS_NODIRATIME, |
179 | /* "mand" */ MS_MANDLOCK, |
180 | /* "nomand" */ ~MS_MANDLOCK, |
181 | /* "relatime" */ MS_RELATIME, |
182 | /* "norelatime" */ ~MS_RELATIME, |
183 | /* "loud" */ ~MS_SILENT, |
184 | |
185 | // action flags |
186 | /* "union" */ MS_UNION, |
187 | /* "bind" */ MS_BIND, |
188 | /* "move" */ MS_MOVE, |
189 | /* "shared" */ MS_SHARED, |
190 | /* "slave" */ MS_SLAVE, |
191 | /* "private" */ MS_PRIVATE, |
192 | /* "unbindable" */ MS_UNBINDABLE, |
193 | /* "rshared" */ MS_SHARED|MS_RECURSIVE, |
194 | /* "rslave" */ MS_SLAVE|MS_RECURSIVE, |
195 | /* "rprivate" */ MS_SLAVE|MS_RECURSIVE, |
196 | /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE, |
197 | ) |
198 | |
199 | // Always understood. |
200 | /* "ro" */ MS_RDONLY, // vfs flag |
201 | /* "rw" */ ~MS_RDONLY, // vfs flag |
202 | /* "remount" */ MS_REMOUNT // action flag |
203 | }; |
204 | |
205 | static const char mount_option_str[] = |
206 | IF_FEATURE_MOUNT_LOOP( |
207 | "loop\0" |
208 | ) |
209 | IF_FEATURE_MOUNT_FSTAB( |
210 | "defaults\0" |
211 | // "quiet\0" - do not filter out, vfat wants to see it |
212 | "noauto\0" |
213 | "sw\0" |
214 | "swap\0" |
215 | IF_DESKTOP("user\0") |
216 | IF_DESKTOP("users\0") |
217 | "_netdev\0" |
218 | ) |
219 | IF_FEATURE_MOUNT_FLAGS( |
220 | // vfs flags |
221 | "nosuid\0" |
222 | "suid\0" |
223 | "dev\0" |
224 | "nodev\0" |
225 | "exec\0" |
226 | "noexec\0" |
227 | "sync\0" |
228 | "dirsync\0" |
229 | "async\0" |
230 | "atime\0" |
231 | "noatime\0" |
232 | "diratime\0" |
233 | "nodiratime\0" |
234 | "mand\0" |
235 | "nomand\0" |
236 | "relatime\0" |
237 | "norelatime\0" |
238 | "loud\0" |
239 | |
240 | // action flags |
241 | "union\0" |
242 | "bind\0" |
243 | "move\0" |
244 | "shared\0" |
245 | "slave\0" |
246 | "private\0" |
247 | "unbindable\0" |
248 | "rshared\0" |
249 | "rslave\0" |
250 | "rprivate\0" |
251 | "runbindable\0" |
252 | ) |
253 | |
254 | // Always understood. |
255 | "ro\0" // vfs flag |
256 | "rw\0" // vfs flag |
257 | "remount\0" // action flag |
258 | ; |
259 | |
260 | |
261 | struct globals { |
262 | #if ENABLE_FEATURE_MOUNT_NFS |
263 | smalluint nfs_mount_version; |
264 | #endif |
265 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
266 | unsigned verbose; |
267 | #endif |
268 | llist_t *fslist; |
269 | char getmntent_buf[1]; |
270 | |
271 | }; |
272 | enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) }; |
273 | #define G (*(struct globals*)&bb_common_bufsiz1) |
274 | #define nfs_mount_version (G.nfs_mount_version) |
275 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
276 | #define verbose (G.verbose ) |
277 | #else |
278 | #define verbose 0 |
279 | #endif |
280 | #define fslist (G.fslist ) |
281 | #define getmntent_buf (G.getmntent_buf ) |
282 | |
283 | |
284 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
285 | static int verbose_mount(const char *source, const char *target, |
286 | const char *filesystemtype, |
287 | unsigned long mountflags, const void *data) |
288 | { |
289 | int rc; |
290 | |
291 | errno = 0; |
292 | rc = mount(source, target, filesystemtype, mountflags, data); |
293 | if (verbose >= 2) |
294 | bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d", |
295 | source, target, filesystemtype, |
296 | mountflags, (char*)data, rc); |
297 | return rc; |
298 | } |
299 | #else |
300 | #define verbose_mount(...) mount(__VA_ARGS__) |
301 | #endif |
302 | |
303 | // Append mount options to string |
304 | static void append_mount_options(char **oldopts, const char *newopts) |
305 | { |
306 | if (*oldopts && **oldopts) { |
307 | // Do not insert options which are already there |
308 | while (newopts[0]) { |
309 | char *p; |
310 | int len = strlen(newopts); |
311 | p = strchr(newopts, ','); |
312 | if (p) len = p - newopts; |
313 | p = *oldopts; |
314 | while (1) { |
315 | if (!strncmp(p, newopts, len) |
316 | && (p[len] == ',' || p[len] == '\0')) |
317 | goto skip; |
318 | p = strchr(p,','); |
319 | if (!p) break; |
320 | p++; |
321 | } |
322 | p = xasprintf("%s,%.*s", *oldopts, len, newopts); |
323 | free(*oldopts); |
324 | *oldopts = p; |
325 | skip: |
326 | newopts += len; |
327 | while (newopts[0] == ',') newopts++; |
328 | } |
329 | } else { |
330 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts); |
331 | *oldopts = xstrdup(newopts); |
332 | } |
333 | } |
334 | |
335 | // Use the mount_options list to parse options into flags. |
336 | // Also return list of unrecognized options if unrecognized != NULL |
337 | static long parse_mount_options(char *options, char **unrecognized) |
338 | { |
339 | long flags = MS_SILENT; |
340 | |
341 | // Loop through options |
342 | for (;;) { |
343 | unsigned i; |
344 | char *comma = strchr(options, ','); |
345 | const char *option_str = mount_option_str; |
346 | |
347 | if (comma) *comma = '\0'; |
348 | |
349 | // FIXME: use hasmntopt() |
350 | // Find this option in mount_options |
351 | for (i = 0; i < ARRAY_SIZE(mount_options); i++) { |
352 | if (!strcasecmp(option_str, options)) { |
353 | long fl = mount_options[i]; |
354 | if (fl < 0) flags &= fl; |
355 | else flags |= fl; |
356 | break; |
357 | } |
358 | option_str += strlen(option_str) + 1; |
359 | } |
360 | // If unrecognized not NULL, append unrecognized mount options |
361 | if (unrecognized && i == ARRAY_SIZE(mount_options)) { |
362 | // Add it to strflags, to pass on to kernel |
363 | i = *unrecognized ? strlen(*unrecognized) : 0; |
364 | *unrecognized = xrealloc(*unrecognized, i + strlen(options) + 2); |
365 | |
366 | // Comma separated if it's not the first one |
367 | if (i) (*unrecognized)[i++] = ','; |
368 | strcpy((*unrecognized)+i, options); |
369 | } |
370 | |
371 | if (!comma) |
372 | break; |
373 | // Advance to next option |
374 | *comma = ','; |
375 | options = ++comma; |
376 | } |
377 | |
378 | return flags; |
379 | } |
380 | |
381 | // Return a list of all block device backed filesystems |
382 | static llist_t *get_block_backed_filesystems(void) |
383 | { |
384 | static const char filesystems[2][sizeof("/proc/filesystems")] = { |
385 | "/etc/filesystems", |
386 | "/proc/filesystems", |
387 | }; |
388 | char *fs, *buf; |
389 | llist_t *list = NULL; |
390 | int i; |
391 | FILE *f; |
392 | |
393 | for (i = 0; i < 2; i++) { |
394 | f = fopen_for_read(filesystems[i]); |
395 | if (!f) continue; |
396 | |
397 | while ((buf = xmalloc_fgetline(f)) != NULL) { |
398 | if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5])) |
399 | continue; |
400 | fs = skip_whitespace(buf); |
401 | if (*fs == '#' || *fs == '*' || !*fs) |
402 | continue; |
403 | |
404 | llist_add_to_end(&list, xstrdup(fs)); |
405 | free(buf); |
406 | } |
407 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f); |
408 | } |
409 | |
410 | return list; |
411 | } |
412 | |
413 | #if ENABLE_FEATURE_CLEAN_UP |
414 | static void delete_block_backed_filesystems(void) |
415 | { |
416 | llist_free(fslist, free); |
417 | } |
418 | #else |
419 | void delete_block_backed_filesystems(void); |
420 | #endif |
421 | |
422 | // Perform actual mount of specific filesystem at specific location. |
423 | // NB: mp->xxx fields may be trashed on exit |
424 | static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts) |
425 | { |
426 | int rc = 0; |
427 | |
428 | if (FAKE_IT) { |
429 | if (verbose >= 2) |
430 | bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')", |
431 | mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
432 | vfsflags, filteropts); |
433 | goto mtab; |
434 | } |
435 | |
436 | // Mount, with fallback to read-only if necessary. |
437 | for (;;) { |
438 | errno = 0; |
439 | rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
440 | vfsflags, filteropts); |
441 | |
442 | // If mount failed, try |
443 | // helper program mount.<mnt_type> |
444 | if (HELPERS_ALLOWED && rc && mp->mnt_type) { |
445 | char *args[8]; |
446 | int errno_save = errno; |
447 | args[0] = xasprintf("mount.%s", mp->mnt_type); |
448 | rc = 1; |
449 | if (FAKE_IT) |
450 | args[rc++] = (char *)"-f"; |
451 | if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB) |
452 | args[rc++] = (char *)"-n"; |
453 | args[rc++] = mp->mnt_fsname; |
454 | args[rc++] = mp->mnt_dir; |
455 | if (filteropts) { |
456 | args[rc++] = (char *)"-o"; |
457 | args[rc++] = filteropts; |
458 | } |
459 | args[rc] = NULL; |
460 | rc = wait4pid(spawn(args)); |
461 | free(args[0]); |
462 | if (!rc) |
463 | break; |
464 | errno = errno_save; |
465 | } |
466 | |
467 | if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS)) |
468 | break; |
469 | if (!(vfsflags & MS_SILENT)) |
470 | bb_error_msg("%s is write-protected, mounting read-only", |
471 | mp->mnt_fsname); |
472 | vfsflags |= MS_RDONLY; |
473 | } |
474 | |
475 | // Abort entirely if permission denied. |
476 | |
477 | if (rc && errno == EPERM) |
478 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
479 | |
480 | // If the mount was successful, and we're maintaining an old-style |
481 | // mtab file by hand, add the new entry to it now. |
482 | mtab: |
483 | if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) { |
484 | char *fsname; |
485 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); |
486 | const char *option_str = mount_option_str; |
487 | int i; |
488 | |
489 | if (!mountTable) { |
490 | bb_error_msg("no %s", bb_path_mtab_file); |
491 | goto ret; |
492 | } |
493 | |
494 | // Add vfs string flags |
495 | |
496 | for (i = 0; mount_options[i] != MS_REMOUNT; i++) { |
497 | if (mount_options[i] > 0 && (mount_options[i] & vfsflags)) |
498 | append_mount_options(&(mp->mnt_opts), option_str); |
499 | option_str += strlen(option_str) + 1; |
500 | } |
501 | |
502 | // Remove trailing / (if any) from directory we mounted on |
503 | |
504 | i = strlen(mp->mnt_dir) - 1; |
505 | if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0'; |
506 | |
507 | // Convert to canonical pathnames as needed |
508 | |
509 | mp->mnt_dir = bb_simplify_path(mp->mnt_dir); |
510 | fsname = 0; |
511 | if (!mp->mnt_type || !*mp->mnt_type) { // bind mount |
512 | mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); |
513 | mp->mnt_type = (char*)"bind"; |
514 | } |
515 | mp->mnt_freq = mp->mnt_passno = 0; |
516 | |
517 | // Write and close. |
518 | |
519 | addmntent(mountTable, mp); |
520 | endmntent(mountTable); |
521 | if (ENABLE_FEATURE_CLEAN_UP) { |
522 | free(mp->mnt_dir); |
523 | free(fsname); |
524 | } |
525 | } |
526 | ret: |
527 | return rc; |
528 | } |
529 | |
530 | #if ENABLE_FEATURE_MOUNT_NFS |
531 | |
532 | /* |
533 | * Linux NFS mount |
534 | * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> |
535 | * |
536 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
537 | * |
538 | * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port |
539 | * numbers to be specified on the command line. |
540 | * |
541 | * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>: |
542 | * Omit the call to connect() for Linux version 1.3.11 or later. |
543 | * |
544 | * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com> |
545 | * Implemented the "bg", "fg" and "retry" mount options for NFS. |
546 | * |
547 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org> |
548 | * - added Native Language Support |
549 | * |
550 | * Modified by Olaf Kirch and Trond Myklebust for new NFS code, |
551 | * plus NFSv3 stuff. |
552 | */ |
553 | |
554 | #define MOUNTPORT 635 |
555 | #define MNTPATHLEN 1024 |
556 | #define MNTNAMLEN 255 |
557 | #define FHSIZE 32 |
558 | #define FHSIZE3 64 |
559 | |
560 | typedef char fhandle[FHSIZE]; |
561 | |
562 | typedef struct { |
563 | unsigned int fhandle3_len; |
564 | char *fhandle3_val; |
565 | } fhandle3; |
566 | |
567 | enum mountstat3 { |
568 | MNT_OK = 0, |
569 | MNT3ERR_PERM = 1, |
570 | MNT3ERR_NOENT = 2, |
571 | MNT3ERR_IO = 5, |
572 | MNT3ERR_ACCES = 13, |
573 | MNT3ERR_NOTDIR = 20, |
574 | MNT3ERR_INVAL = 22, |
575 | MNT3ERR_NAMETOOLONG = 63, |
576 | MNT3ERR_NOTSUPP = 10004, |
577 | MNT3ERR_SERVERFAULT = 10006, |
578 | }; |
579 | typedef enum mountstat3 mountstat3; |
580 | |
581 | struct fhstatus { |
582 | unsigned int fhs_status; |
583 | union { |
584 | fhandle fhs_fhandle; |
585 | } fhstatus_u; |
586 | }; |
587 | typedef struct fhstatus fhstatus; |
588 | |
589 | struct mountres3_ok { |
590 | fhandle3 fhandle; |
591 | struct { |
592 | unsigned int auth_flavours_len; |
593 | char *auth_flavours_val; |
594 | } auth_flavours; |
595 | }; |
596 | typedef struct mountres3_ok mountres3_ok; |
597 | |
598 | struct mountres3 { |
599 | mountstat3 fhs_status; |
600 | union { |
601 | mountres3_ok mountinfo; |
602 | } mountres3_u; |
603 | }; |
604 | typedef struct mountres3 mountres3; |
605 | |
606 | typedef char *dirpath; |
607 | |
608 | typedef char *name; |
609 | |
610 | typedef struct mountbody *mountlist; |
611 | |
612 | struct mountbody { |
613 | name ml_hostname; |
614 | dirpath ml_directory; |
615 | mountlist ml_next; |
616 | }; |
617 | typedef struct mountbody mountbody; |
618 | |
619 | typedef struct groupnode *groups; |
620 | |
621 | struct groupnode { |
622 | name gr_name; |
623 | groups gr_next; |
624 | }; |
625 | typedef struct groupnode groupnode; |
626 | |
627 | typedef struct exportnode *exports; |
628 | |
629 | struct exportnode { |
630 | dirpath ex_dir; |
631 | groups ex_groups; |
632 | exports ex_next; |
633 | }; |
634 | typedef struct exportnode exportnode; |
635 | |
636 | struct ppathcnf { |
637 | int pc_link_max; |
638 | short pc_max_canon; |
639 | short pc_max_input; |
640 | short pc_name_max; |
641 | short pc_path_max; |
642 | short pc_pipe_buf; |
643 | uint8_t pc_vdisable; |
644 | char pc_xxx; |
645 | short pc_mask[2]; |
646 | }; |
647 | typedef struct ppathcnf ppathcnf; |
648 | |
649 | #define MOUNTPROG 100005 |
650 | #define MOUNTVERS 1 |
651 | |
652 | #define MOUNTPROC_NULL 0 |
653 | #define MOUNTPROC_MNT 1 |
654 | #define MOUNTPROC_DUMP 2 |
655 | #define MOUNTPROC_UMNT 3 |
656 | #define MOUNTPROC_UMNTALL 4 |
657 | #define MOUNTPROC_EXPORT 5 |
658 | #define MOUNTPROC_EXPORTALL 6 |
659 | |
660 | #define MOUNTVERS_POSIX 2 |
661 | |
662 | #define MOUNTPROC_PATHCONF 7 |
663 | |
664 | #define MOUNT_V3 3 |
665 | |
666 | #define MOUNTPROC3_NULL 0 |
667 | #define MOUNTPROC3_MNT 1 |
668 | #define MOUNTPROC3_DUMP 2 |
669 | #define MOUNTPROC3_UMNT 3 |
670 | #define MOUNTPROC3_UMNTALL 4 |
671 | #define MOUNTPROC3_EXPORT 5 |
672 | |
673 | enum { |
674 | #ifndef NFS_FHSIZE |
675 | NFS_FHSIZE = 32, |
676 | #endif |
677 | #ifndef NFS_PORT |
678 | NFS_PORT = 2049 |
679 | #endif |
680 | }; |
681 | |
682 | /* |
683 | * We want to be able to compile mount on old kernels in such a way |
684 | * that the binary will work well on more recent kernels. |
685 | * Thus, if necessary we teach nfsmount.c the structure of new fields |
686 | * that will come later. |
687 | * |
688 | * Moreover, the new kernel includes conflict with glibc includes |
689 | * so it is easiest to ignore the kernel altogether (at compile time). |
690 | */ |
691 | |
692 | struct nfs2_fh { |
693 | char data[32]; |
694 | }; |
695 | struct nfs3_fh { |
696 | unsigned short size; |
697 | unsigned char data[64]; |
698 | }; |
699 | |
700 | struct nfs_mount_data { |
701 | int version; /* 1 */ |
702 | int fd; /* 1 */ |
703 | struct nfs2_fh old_root; /* 1 */ |
704 | int flags; /* 1 */ |
705 | int rsize; /* 1 */ |
706 | int wsize; /* 1 */ |
707 | int timeo; /* 1 */ |
708 | int retrans; /* 1 */ |
709 | int acregmin; /* 1 */ |
710 | int acregmax; /* 1 */ |
711 | int acdirmin; /* 1 */ |
712 | int acdirmax; /* 1 */ |
713 | struct sockaddr_in addr; /* 1 */ |
714 | char hostname[256]; /* 1 */ |
715 | int namlen; /* 2 */ |
716 | unsigned int bsize; /* 3 */ |
717 | struct nfs3_fh root; /* 4 */ |
718 | }; |
719 | |
720 | /* bits in the flags field */ |
721 | enum { |
722 | NFS_MOUNT_SOFT = 0x0001, /* 1 */ |
723 | NFS_MOUNT_INTR = 0x0002, /* 1 */ |
724 | NFS_MOUNT_SECURE = 0x0004, /* 1 */ |
725 | NFS_MOUNT_POSIX = 0x0008, /* 1 */ |
726 | NFS_MOUNT_NOCTO = 0x0010, /* 1 */ |
727 | NFS_MOUNT_NOAC = 0x0020, /* 1 */ |
728 | NFS_MOUNT_TCP = 0x0040, /* 2 */ |
729 | NFS_MOUNT_VER3 = 0x0080, /* 3 */ |
730 | NFS_MOUNT_KERBEROS = 0x0100, /* 3 */ |
731 | NFS_MOUNT_NONLM = 0x0200, /* 3 */ |
732 | NFS_MOUNT_NORDIRPLUS = 0x4000 |
733 | }; |
734 | |
735 | |
736 | /* |
737 | * We need to translate between nfs status return values and |
738 | * the local errno values which may not be the same. |
739 | * |
740 | * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno: |
741 | * "after #include <errno.h> the symbol errno is reserved for any use, |
742 | * it cannot even be used as a struct tag or field name". |
743 | */ |
744 | #ifndef EDQUOT |
745 | # define EDQUOT ENOSPC |
746 | #endif |
747 | /* Convert each NFSERR_BLAH into EBLAH */ |
748 | static const uint8_t nfs_err_stat[] = { |
749 | 1, 2, 5, 6, 13, 17, |
750 | 19, 20, 21, 22, 27, 28, |
751 | 30, 63, 66, 69, 70, 71 |
752 | }; |
753 | static const uint8_t nfs_err_errnum[] = { |
754 | EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST, |
755 | ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC, |
756 | EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE |
757 | }; |
758 | static char *nfs_strerror(int status) |
759 | { |
760 | int i; |
761 | |
762 | for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) { |
763 | if (nfs_err_stat[i] == status) |
764 | return strerror(nfs_err_errnum[i]); |
765 | } |
766 | return xasprintf("unknown nfs status return value: %d", status); |
767 | } |
768 | |
769 | static bool_t xdr_fhandle(XDR *xdrs, fhandle objp) |
770 | { |
771 | if (!xdr_opaque(xdrs, objp, FHSIZE)) |
772 | return FALSE; |
773 | return TRUE; |
774 | } |
775 | |
776 | static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp) |
777 | { |
778 | if (!xdr_u_int(xdrs, &objp->fhs_status)) |
779 | return FALSE; |
780 | switch (objp->fhs_status) { |
781 | case 0: |
782 | if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle)) |
783 | return FALSE; |
784 | break; |
785 | default: |
786 | break; |
787 | } |
788 | return TRUE; |
789 | } |
790 | |
791 | static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp) |
792 | { |
793 | if (!xdr_string(xdrs, objp, MNTPATHLEN)) |
794 | return FALSE; |
795 | return TRUE; |
796 | } |
797 | |
798 | static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp) |
799 | { |
800 | if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, |
801 | (unsigned int *) &objp->fhandle3_len, |
802 | FHSIZE3) |
803 | ) { |
804 | return FALSE; |
805 | } |
806 | return TRUE; |
807 | } |
808 | |
809 | static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp) |
810 | { |
811 | if (!xdr_fhandle3(xdrs, &objp->fhandle)) |
812 | return FALSE; |
813 | if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), |
814 | &(objp->auth_flavours.auth_flavours_len), |
815 | ~0, |
816 | sizeof(int), |
817 | (xdrproc_t) xdr_int) |
818 | ) { |
819 | return FALSE; |
820 | } |
821 | return TRUE; |
822 | } |
823 | |
824 | static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp) |
825 | { |
826 | if (!xdr_enum(xdrs, (enum_t *) objp)) |
827 | return FALSE; |
828 | return TRUE; |
829 | } |
830 | |
831 | static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp) |
832 | { |
833 | if (!xdr_mountstat3(xdrs, &objp->fhs_status)) |
834 | return FALSE; |
835 | switch (objp->fhs_status) { |
836 | case MNT_OK: |
837 | if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo)) |
838 | return FALSE; |
839 | break; |
840 | default: |
841 | break; |
842 | } |
843 | return TRUE; |
844 | } |
845 | |
846 | #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) |
847 | |
848 | /* |
849 | * Unfortunately, the kernel prints annoying console messages |
850 | * in case of an unexpected nfs mount version (instead of |
851 | * just returning some error). Therefore we'll have to try |
852 | * and figure out what version the kernel expects. |
853 | * |
854 | * Variables: |
855 | * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time |
856 | * NFS_MOUNT_VERSION: these nfsmount sources at compile time |
857 | * nfs_mount_version: version this source and running kernel can handle |
858 | */ |
859 | static void |
860 | find_kernel_nfs_mount_version(void) |
861 | { |
862 | int kernel_version; |
863 | |
864 | if (nfs_mount_version) |
865 | return; |
866 | |
867 | nfs_mount_version = 4; /* default */ |
868 | |
869 | kernel_version = get_linux_version_code(); |
870 | if (kernel_version) { |
871 | if (kernel_version < KERNEL_VERSION(2,2,18)) |
872 | nfs_mount_version = 3; |
873 | /* else v4 since 2.3.99pre4 */ |
874 | } |
875 | } |
876 | |
877 | static void |
878 | get_mountport(struct pmap *pm_mnt, |
879 | struct sockaddr_in *server_addr, |
880 | long unsigned prog, |
881 | long unsigned version, |
882 | long unsigned proto, |
883 | long unsigned port) |
884 | { |
885 | struct pmaplist *pmap; |
886 | |
887 | server_addr->sin_port = PMAPPORT; |
888 | /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *). |
889 | * I understand it like "IPv6 for this is not 100% ready" */ |
890 | pmap = pmap_getmaps(server_addr); |
891 | |
892 | if (version > MAX_NFSPROT) |
893 | version = MAX_NFSPROT; |
894 | if (!prog) |
895 | prog = MOUNTPROG; |
896 | pm_mnt->pm_prog = prog; |
897 | pm_mnt->pm_vers = version; |
898 | pm_mnt->pm_prot = proto; |
899 | pm_mnt->pm_port = port; |
900 | |
901 | while (pmap) { |
902 | if (pmap->pml_map.pm_prog != prog) |
903 | goto next; |
904 | if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers) |
905 | goto next; |
906 | if (version > 2 && pmap->pml_map.pm_vers != version) |
907 | goto next; |
908 | if (version && version <= 2 && pmap->pml_map.pm_vers > 2) |
909 | goto next; |
910 | if (pmap->pml_map.pm_vers > MAX_NFSPROT || |
911 | (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) || |
912 | (port && pmap->pml_map.pm_port != port)) |
913 | goto next; |
914 | memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt)); |
915 | next: |
916 | pmap = pmap->pml_next; |
917 | } |
918 | if (!pm_mnt->pm_vers) |
919 | pm_mnt->pm_vers = MOUNTVERS; |
920 | if (!pm_mnt->pm_port) |
921 | pm_mnt->pm_port = MOUNTPORT; |
922 | if (!pm_mnt->pm_prot) |
923 | pm_mnt->pm_prot = IPPROTO_TCP; |
924 | } |
925 | |
926 | #if BB_MMU |
927 | static int daemonize(void) |
928 | { |
929 | int pid = fork(); |
930 | if (pid < 0) /* error */ |
931 | return -errno; |
932 | if (pid > 0) /* parent */ |
933 | return 0; |
934 | /* child */ |
935 | close(0); |
936 | xopen(bb_dev_null, O_RDWR); |
937 | xdup2(0, 1); |
938 | xdup2(0, 2); |
939 | setsid(); |
940 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
941 | logmode = LOGMODE_SYSLOG; |
942 | return 1; |
943 | } |
944 | #else |
945 | static inline int daemonize(void) { return -ENOSYS; } |
946 | #endif |
947 | |
948 | /* TODO */ |
949 | static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM) |
950 | { |
951 | return 0; |
952 | } |
953 | |
954 | /* RPC strerror analogs are terminally idiotic: |
955 | * *mandatory* prefix and \n at end. |
956 | * This hopefully helps. Usage: |
957 | * error_msg_rpc(clnt_*error*(" ")) */ |
958 | static void error_msg_rpc(const char *msg) |
959 | { |
960 | int len; |
961 | while (msg[0] == ' ' || msg[0] == ':') msg++; |
962 | len = strlen(msg); |
963 | while (len && msg[len-1] == '\n') len--; |
964 | bb_error_msg("%.*s", len, msg); |
965 | } |
966 | |
967 | /* NB: mp->xxx fields may be trashed on exit */ |
968 | static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) |
969 | { |
970 | CLIENT *mclient; |
971 | char *hostname; |
972 | char *pathname; |
973 | char *mounthost; |
974 | /* prior to 2.6.23, kernel took NFS options in a form of this struct |
975 | * only. 2.6.23+ looks at data->version, and if it's not 1..6, |
976 | * then data pointer is interpreted as a string. */ |
977 | struct nfs_mount_data data; |
978 | char *opt; |
979 | struct hostent *hp; |
980 | struct sockaddr_in server_addr; |
981 | struct sockaddr_in mount_server_addr; |
982 | int msock, fsock; |
983 | union { |
984 | struct fhstatus nfsv2; |
985 | struct mountres3 nfsv3; |
986 | } status; |
987 | int daemonized; |
988 | char *s; |
989 | int port; |
990 | int mountport; |
991 | int proto; |
992 | #if BB_MMU |
993 | smallint bg = 0; |
994 | #else |
995 | enum { bg = 0 }; |
996 | #endif |
997 | int retry; |
998 | int mountprog; |
999 | int mountvers; |
1000 | int nfsprog; |
1001 | int nfsvers; |
1002 | int retval; |
1003 | /* these all are one-bit really. gcc 4.3.1 likes this combination: */ |
1004 | smallint tcp; |
1005 | smallint soft; |
1006 | int intr; |
1007 | int posix; |
1008 | int nocto; |
1009 | int noac; |
1010 | int nordirplus; |
1011 | int nolock; |
1012 | |
1013 | find_kernel_nfs_mount_version(); |
1014 | |
1015 | daemonized = 0; |
1016 | mounthost = NULL; |
1017 | retval = ETIMEDOUT; |
1018 | msock = fsock = -1; |
1019 | mclient = NULL; |
1020 | |
1021 | /* NB: hostname, mounthost, filteropts must be free()d prior to return */ |
1022 | |
1023 | filteropts = xstrdup(filteropts); /* going to trash it later... */ |
1024 | |
1025 | hostname = xstrdup(mp->mnt_fsname); |
1026 | /* mount_main() guarantees that ':' is there */ |
1027 | s = strchr(hostname, ':'); |
1028 | pathname = s + 1; |
1029 | *s = '\0'; |
1030 | /* Ignore all but first hostname in replicated mounts |
1031 | until they can be fully supported. (mack@sgi.com) */ |
1032 | s = strchr(hostname, ','); |
1033 | if (s) { |
1034 | *s = '\0'; |
1035 | bb_error_msg("warning: multiple hostnames not supported"); |
1036 | } |
1037 | |
1038 | server_addr.sin_family = AF_INET; |
1039 | if (!inet_aton(hostname, &server_addr.sin_addr)) { |
1040 | hp = gethostbyname(hostname); |
1041 | if (hp == NULL) { |
1042 | bb_herror_msg("%s", hostname); |
1043 | goto fail; |
1044 | } |
1045 | if ((size_t)hp->h_length > sizeof(struct in_addr)) { |
1046 | bb_error_msg("got bad hp->h_length"); |
1047 | hp->h_length = sizeof(struct in_addr); |
1048 | } |
1049 | memcpy(&server_addr.sin_addr, |
1050 | hp->h_addr, hp->h_length); |
1051 | } |
1052 | |
1053 | memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr)); |
1054 | |
1055 | /* add IP address to mtab options for use when unmounting */ |
1056 | |
1057 | if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */ |
1058 | mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr)); |
1059 | } else { |
1060 | char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts, |
1061 | mp->mnt_opts[0] ? "," : "", |
1062 | inet_ntoa(server_addr.sin_addr)); |
1063 | free(mp->mnt_opts); |
1064 | mp->mnt_opts = tmp; |
1065 | } |
1066 | |
1067 | /* Set default options. |
1068 | * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to |
1069 | * let the kernel decide. |
1070 | * timeo is filled in after we know whether it'll be TCP or UDP. */ |
1071 | memset(&data, 0, sizeof(data)); |
1072 | data.retrans = 3; |
1073 | data.acregmin = 3; |
1074 | data.acregmax = 60; |
1075 | data.acdirmin = 30; |
1076 | data.acdirmax = 60; |
1077 | data.namlen = NAME_MAX; |
1078 | |
1079 | soft = 0; |
1080 | intr = 0; |
1081 | posix = 0; |
1082 | nocto = 0; |
1083 | nolock = 0; |
1084 | noac = 0; |
1085 | nordirplus = 0; |
1086 | retry = 10000; /* 10000 minutes ~ 1 week */ |
1087 | tcp = 0; |
1088 | |
1089 | mountprog = MOUNTPROG; |
1090 | mountvers = 0; |
1091 | port = 0; |
1092 | mountport = 0; |
1093 | nfsprog = 100003; |
1094 | nfsvers = 0; |
1095 | |
1096 | /* parse options */ |
1097 | if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { |
1098 | char *opteq = strchr(opt, '='); |
1099 | if (opteq) { |
1100 | int val, idx; |
1101 | static const char options[] ALIGN1 = |
1102 | /* 0 */ "rsize\0" |
1103 | /* 1 */ "wsize\0" |
1104 | /* 2 */ "timeo\0" |
1105 | /* 3 */ "retrans\0" |
1106 | /* 4 */ "acregmin\0" |
1107 | /* 5 */ "acregmax\0" |
1108 | /* 6 */ "acdirmin\0" |
1109 | /* 7 */ "acdirmax\0" |
1110 | /* 8 */ "actimeo\0" |
1111 | /* 9 */ "retry\0" |
1112 | /* 10 */ "port\0" |
1113 | /* 11 */ "mountport\0" |
1114 | /* 12 */ "mounthost\0" |
1115 | /* 13 */ "mountprog\0" |
1116 | /* 14 */ "mountvers\0" |
1117 | /* 15 */ "nfsprog\0" |
1118 | /* 16 */ "nfsvers\0" |
1119 | /* 17 */ "vers\0" |
1120 | /* 18 */ "proto\0" |
1121 | /* 19 */ "namlen\0" |
1122 | /* 20 */ "addr\0"; |
1123 | |
1124 | *opteq++ = '\0'; |
1125 | idx = index_in_strings(options, opt); |
1126 | switch (idx) { |
1127 | case 12: // "mounthost" |
1128 | mounthost = xstrndup(opteq, |
1129 | strcspn(opteq, " \t\n\r,")); |
1130 | continue; |
1131 | case 18: // "proto" |
1132 | if (!strncmp(opteq, "tcp", 3)) |
1133 | tcp = 1; |
1134 | else if (!strncmp(opteq, "udp", 3)) |
1135 | tcp = 0; |
1136 | else |
1137 | bb_error_msg("warning: unrecognized proto= option"); |
1138 | continue; |
1139 | case 20: // "addr" - ignore |
1140 | continue; |
1141 | } |
1142 | |
1143 | val = xatoi_u(opteq); |
1144 | switch (idx) { |
1145 | case 0: // "rsize" |
1146 | data.rsize = val; |
1147 | continue; |
1148 | case 1: // "wsize" |
1149 | data.wsize = val; |
1150 | continue; |
1151 | case 2: // "timeo" |
1152 | data.timeo = val; |
1153 | continue; |
1154 | case 3: // "retrans" |
1155 | data.retrans = val; |
1156 | continue; |
1157 | case 4: // "acregmin" |
1158 | data.acregmin = val; |
1159 | continue; |
1160 | case 5: // "acregmax" |
1161 | data.acregmax = val; |
1162 | continue; |
1163 | case 6: // "acdirmin" |
1164 | data.acdirmin = val; |
1165 | continue; |
1166 | case 7: // "acdirmax" |
1167 | data.acdirmax = val; |
1168 | continue; |
1169 | case 8: // "actimeo" |
1170 | data.acregmin = val; |
1171 | data.acregmax = val; |
1172 | data.acdirmin = val; |
1173 | data.acdirmax = val; |
1174 | continue; |
1175 | case 9: // "retry" |
1176 | retry = val; |
1177 | continue; |
1178 | case 10: // "port" |
1179 | port = val; |
1180 | continue; |
1181 | case 11: // "mountport" |
1182 | mountport = val; |
1183 | continue; |
1184 | case 13: // "mountprog" |
1185 | mountprog = val; |
1186 | continue; |
1187 | case 14: // "mountvers" |
1188 | mountvers = val; |
1189 | continue; |
1190 | case 15: // "nfsprog" |
1191 | nfsprog = val; |
1192 | continue; |
1193 | case 16: // "nfsvers" |
1194 | case 17: // "vers" |
1195 | nfsvers = val; |
1196 | continue; |
1197 | case 19: // "namlen" |
1198 | //if (nfs_mount_version >= 2) |
1199 | data.namlen = val; |
1200 | //else |
1201 | // bb_error_msg("warning: option namlen is not supported\n"); |
1202 | continue; |
1203 | default: |
1204 | bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); |
1205 | goto fail; |
1206 | } |
1207 | } |
1208 | else { /* not of the form opt=val */ |
1209 | static const char options[] ALIGN1 = |
1210 | "bg\0" |
1211 | "fg\0" |
1212 | "soft\0" |
1213 | "hard\0" |
1214 | "intr\0" |
1215 | "posix\0" |
1216 | "cto\0" |
1217 | "ac\0" |
1218 | "tcp\0" |
1219 | "udp\0" |
1220 | "lock\0" |
1221 | "rdirplus\0"; |
1222 | int val = 1; |
1223 | if (!strncmp(opt, "no", 2)) { |
1224 | val = 0; |
1225 | opt += 2; |
1226 | } |
1227 | switch (index_in_strings(options, opt)) { |
1228 | case 0: // "bg" |
1229 | #if BB_MMU |
1230 | bg = val; |
1231 | #endif |
1232 | break; |
1233 | case 1: // "fg" |
1234 | #if BB_MMU |
1235 | bg = !val; |
1236 | #endif |
1237 | break; |
1238 | case 2: // "soft" |
1239 | soft = val; |
1240 | break; |
1241 | case 3: // "hard" |
1242 | soft = !val; |
1243 | break; |
1244 | case 4: // "intr" |
1245 | intr = val; |
1246 | break; |
1247 | case 5: // "posix" |
1248 | posix = val; |
1249 | break; |
1250 | case 6: // "cto" |
1251 | nocto = !val; |
1252 | break; |
1253 | case 7: // "ac" |
1254 | noac = !val; |
1255 | break; |
1256 | case 8: // "tcp" |
1257 | tcp = val; |
1258 | break; |
1259 | case 9: // "udp" |
1260 | tcp = !val; |
1261 | break; |
1262 | case 10: // "lock" |
1263 | if (nfs_mount_version >= 3) |
1264 | nolock = !val; |
1265 | else |
1266 | bb_error_msg("warning: option nolock is not supported"); |
1267 | break; |
1268 | case 11: //rdirplus |
1269 | nordirplus = !val; |
1270 | break; |
1271 | default: |
1272 | bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt); |
1273 | goto fail; |
1274 | } |
1275 | } |
1276 | } |
1277 | proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP; |
1278 | |
1279 | data.flags = (soft ? NFS_MOUNT_SOFT : 0) |
1280 | | (intr ? NFS_MOUNT_INTR : 0) |
1281 | | (posix ? NFS_MOUNT_POSIX : 0) |
1282 | | (nocto ? NFS_MOUNT_NOCTO : 0) |
1283 | | (noac ? NFS_MOUNT_NOAC : 0) |
1284 | | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0); |
1285 | if (nfs_mount_version >= 2) |
1286 | data.flags |= (tcp ? NFS_MOUNT_TCP : 0); |
1287 | if (nfs_mount_version >= 3) |
1288 | data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); |
1289 | if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) { |
1290 | bb_error_msg("NFSv%d not supported", nfsvers); |
1291 | goto fail; |
1292 | } |
1293 | if (nfsvers && !mountvers) |
1294 | mountvers = (nfsvers < 3) ? 1 : nfsvers; |
1295 | if (nfsvers && nfsvers < mountvers) { |
1296 | mountvers = nfsvers; |
1297 | } |
1298 | |
1299 | /* Adjust options if none specified */ |
1300 | if (!data.timeo) |
1301 | data.timeo = tcp ? 70 : 7; |
1302 | |
1303 | data.version = nfs_mount_version; |
1304 | |
1305 | if (vfsflags & MS_REMOUNT) |
1306 | goto do_mount; |
1307 | |
1308 | /* |
1309 | * If the previous mount operation on the same host was |
1310 | * backgrounded, and the "bg" for this mount is also set, |
1311 | * give up immediately, to avoid the initial timeout. |
1312 | */ |
1313 | if (bg && we_saw_this_host_before(hostname)) { |
1314 | daemonized = daemonize(); |
1315 | if (daemonized <= 0) { /* parent or error */ |
1316 | retval = -daemonized; |
1317 | goto ret; |
1318 | } |
1319 | } |
1320 | |
1321 | /* Create mount daemon client */ |
1322 | /* See if the nfs host = mount host. */ |
1323 | if (mounthost) { |
1324 | if (mounthost[0] >= '0' && mounthost[0] <= '9') { |
1325 | mount_server_addr.sin_family = AF_INET; |
1326 | mount_server_addr.sin_addr.s_addr = inet_addr(hostname); |
1327 | } else { |
1328 | hp = gethostbyname(mounthost); |
1329 | if (hp == NULL) { |
1330 | bb_herror_msg("%s", mounthost); |
1331 | goto fail; |
1332 | } |
1333 | if ((size_t)hp->h_length > sizeof(struct in_addr)) { |
1334 | bb_error_msg("got bad hp->h_length"); |
1335 | hp->h_length = sizeof(struct in_addr); |
1336 | } |
1337 | mount_server_addr.sin_family = AF_INET; |
1338 | memcpy(&mount_server_addr.sin_addr, |
1339 | hp->h_addr, hp->h_length); |
1340 | } |
1341 | } |
1342 | |
1343 | /* |
1344 | * The following loop implements the mount retries. When the mount |
1345 | * times out, and the "bg" option is set, we background ourself |
1346 | * and continue trying. |
1347 | * |
1348 | * The case where the mount point is not present and the "bg" |
1349 | * option is set, is treated as a timeout. This is done to |
1350 | * support nested mounts. |
1351 | * |
1352 | * The "retry" count specified by the user is the number of |
1353 | * minutes to retry before giving up. |
1354 | */ |
1355 | { |
1356 | struct timeval total_timeout; |
1357 | struct timeval retry_timeout; |
1358 | struct pmap pm_mnt; |
1359 | time_t t; |
1360 | time_t prevt; |
1361 | time_t timeout; |
1362 | |
1363 | retry_timeout.tv_sec = 3; |
1364 | retry_timeout.tv_usec = 0; |
1365 | total_timeout.tv_sec = 20; |
1366 | total_timeout.tv_usec = 0; |
1367 | /* FIXME: use monotonic()? */ |
1368 | timeout = time(NULL) + 60 * retry; |
1369 | prevt = 0; |
1370 | t = 30; |
1371 | retry: |
1372 | /* Be careful not to use too many CPU cycles */ |
1373 | if (t - prevt < 30) |
1374 | sleep(30); |
1375 | |
1376 | get_mountport(&pm_mnt, &mount_server_addr, |
1377 | mountprog, |
1378 | mountvers, |
1379 | proto, |
1380 | mountport); |
1381 | nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers; |
1382 | |
1383 | /* contact the mount daemon via TCP */ |
1384 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
1385 | msock = RPC_ANYSOCK; |
1386 | |
1387 | switch (pm_mnt.pm_prot) { |
1388 | case IPPROTO_UDP: |
1389 | mclient = clntudp_create(&mount_server_addr, |
1390 | pm_mnt.pm_prog, |
1391 | pm_mnt.pm_vers, |
1392 | retry_timeout, |
1393 | &msock); |
1394 | if (mclient) |
1395 | break; |
1396 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
1397 | msock = RPC_ANYSOCK; |
1398 | case IPPROTO_TCP: |
1399 | mclient = clnttcp_create(&mount_server_addr, |
1400 | pm_mnt.pm_prog, |
1401 | pm_mnt.pm_vers, |
1402 | &msock, 0, 0); |
1403 | break; |
1404 | default: |
1405 | mclient = NULL; |
1406 | } |
1407 | if (!mclient) { |
1408 | if (!daemonized && prevt == 0) |
1409 | error_msg_rpc(clnt_spcreateerror(" ")); |
1410 | } else { |
1411 | enum clnt_stat clnt_stat; |
1412 | |
1413 | /* Try to mount hostname:pathname */ |
1414 | mclient->cl_auth = authunix_create_default(); |
1415 | |
1416 | /* Make pointers in xdr_mountres3 NULL so |
1417 | * that xdr_array allocates memory for us |
1418 | */ |
1419 | memset(&status, 0, sizeof(status)); |
1420 | |
1421 | if (pm_mnt.pm_vers == 3) |
1422 | clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, |
1423 | (xdrproc_t) xdr_dirpath, |
1424 | (caddr_t) &pathname, |
1425 | (xdrproc_t) xdr_mountres3, |
1426 | (caddr_t) &status, |
1427 | total_timeout); |
1428 | else |
1429 | clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, |
1430 | (xdrproc_t) xdr_dirpath, |
1431 | (caddr_t) &pathname, |
1432 | (xdrproc_t) xdr_fhstatus, |
1433 | (caddr_t) &status, |
1434 | total_timeout); |
1435 | |
1436 | if (clnt_stat == RPC_SUCCESS) |
1437 | goto prepare_kernel_data; /* we're done */ |
1438 | if (errno != ECONNREFUSED) { |
1439 | error_msg_rpc(clnt_sperror(mclient, " ")); |
1440 | goto fail; /* don't retry */ |
1441 | } |
1442 | /* Connection refused */ |
1443 | if (!daemonized && prevt == 0) /* print just once */ |
1444 | error_msg_rpc(clnt_sperror(mclient, " ")); |
1445 | auth_destroy(mclient->cl_auth); |
1446 | clnt_destroy(mclient); |
1447 | mclient = NULL; |
1448 | close(msock); |
1449 | msock = -1; |
1450 | } |
1451 | |
1452 | /* Timeout. We are going to retry... maybe */ |
1453 | if (!bg) |
1454 | goto fail; |
1455 | if (!daemonized) { |
1456 | daemonized = daemonize(); |
1457 | if (daemonized <= 0) { /* parent or error */ |
1458 | retval = -daemonized; |
1459 | goto ret; |
1460 | } |
1461 | } |
1462 | prevt = t; |
1463 | t = time(NULL); |
1464 | if (t >= timeout) |
1465 | /* TODO error message */ |
1466 | goto fail; |
1467 | |
1468 | goto retry; |
1469 | } |
1470 | |
1471 | prepare_kernel_data: |
1472 | |
1473 | if (nfsvers == 2) { |
1474 | if (status.nfsv2.fhs_status != 0) { |
1475 | bb_error_msg("%s:%s failed, reason given by server: %s", |
1476 | hostname, pathname, |
1477 | nfs_strerror(status.nfsv2.fhs_status)); |
1478 | goto fail; |
1479 | } |
1480 | memcpy(data.root.data, |
1481 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
1482 | NFS_FHSIZE); |
1483 | data.root.size = NFS_FHSIZE; |
1484 | memcpy(data.old_root.data, |
1485 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
1486 | NFS_FHSIZE); |
1487 | } else { |
1488 | fhandle3 *my_fhandle; |
1489 | if (status.nfsv3.fhs_status != 0) { |
1490 | bb_error_msg("%s:%s failed, reason given by server: %s", |
1491 | hostname, pathname, |
1492 | nfs_strerror(status.nfsv3.fhs_status)); |
1493 | goto fail; |
1494 | } |
1495 | my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; |
1496 | memset(data.old_root.data, 0, NFS_FHSIZE); |
1497 | memset(&data.root, 0, sizeof(data.root)); |
1498 | data.root.size = my_fhandle->fhandle3_len; |
1499 | memcpy(data.root.data, |
1500 | (char *) my_fhandle->fhandle3_val, |
1501 | my_fhandle->fhandle3_len); |
1502 | |
1503 | data.flags |= NFS_MOUNT_VER3; |
1504 | } |
1505 | |
1506 | /* Create nfs socket for kernel */ |
1507 | if (tcp) { |
1508 | if (nfs_mount_version < 3) { |
1509 | bb_error_msg("NFS over TCP is not supported"); |
1510 | goto fail; |
1511 | } |
1512 | fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
1513 | } else |
1514 | fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1515 | if (fsock < 0) { |
1516 | bb_perror_msg("nfs socket"); |
1517 | goto fail; |
1518 | } |
1519 | if (bindresvport(fsock, 0) < 0) { |
1520 | bb_perror_msg("nfs bindresvport"); |
1521 | goto fail; |
1522 | } |
1523 | if (port == 0) { |
1524 | server_addr.sin_port = PMAPPORT; |
1525 | port = pmap_getport(&server_addr, nfsprog, nfsvers, |
1526 | tcp ? IPPROTO_TCP : IPPROTO_UDP); |
1527 | if (port == 0) |
1528 | port = NFS_PORT; |
1529 | } |
1530 | server_addr.sin_port = htons(port); |
1531 | |
1532 | /* Prepare data structure for kernel */ |
1533 | data.fd = fsock; |
1534 | memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); |
1535 | strncpy(data.hostname, hostname, sizeof(data.hostname)); |
1536 | |
1537 | /* Clean up */ |
1538 | auth_destroy(mclient->cl_auth); |
1539 | clnt_destroy(mclient); |
1540 | close(msock); |
1541 | msock = -1; |
1542 | |
1543 | if (bg) { |
1544 | /* We must wait until mount directory is available */ |
1545 | struct stat statbuf; |
1546 | int delay = 1; |
1547 | while (stat(mp->mnt_dir, &statbuf) == -1) { |
1548 | if (!daemonized) { |
1549 | daemonized = daemonize(); |
1550 | if (daemonized <= 0) { /* parent or error */ |
1551 | /* FIXME: parent doesn't close fsock - ??! */ |
1552 | retval = -daemonized; |
1553 | goto ret; |
1554 | } |
1555 | } |
1556 | sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */ |
1557 | delay *= 2; |
1558 | if (delay > 30) |
1559 | delay = 30; |
1560 | } |
1561 | } |
1562 | |
1563 | /* Perform actual mount */ |
1564 | do_mount: |
1565 | mp->mnt_type = (char*)"nfs"; |
1566 | retval = mount_it_now(mp, vfsflags, (char*)&data); |
1567 | goto ret; |
1568 | |
1569 | /* Abort */ |
1570 | fail: |
1571 | if (msock >= 0) { |
1572 | if (mclient) { |
1573 | auth_destroy(mclient->cl_auth); |
1574 | clnt_destroy(mclient); |
1575 | } |
1576 | close(msock); |
1577 | } |
1578 | if (fsock >= 0) |
1579 | close(fsock); |
1580 | |
1581 | ret: |
1582 | free(hostname); |
1583 | free(mounthost); |
1584 | free(filteropts); |
1585 | return retval; |
1586 | } |
1587 | |
1588 | #else // !ENABLE_FEATURE_MOUNT_NFS |
1589 | |
1590 | // Never called. Call should be optimized out. |
1591 | int nfsmount(struct mntent *mp, long vfsflags, char *filteropts); |
1592 | |
1593 | #endif // !ENABLE_FEATURE_MOUNT_NFS |
1594 | |
1595 | // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem |
1596 | // type detection. Returns 0 for success, nonzero for failure. |
1597 | // NB: mp->xxx fields may be trashed on exit |
1598 | static int singlemount(struct mntent *mp, int ignore_busy) |
1599 | { |
1600 | int rc = -1; |
1601 | long vfsflags; |
1602 | char *loopFile = NULL, *filteropts = NULL; |
1603 | llist_t *fl = NULL; |
1604 | struct stat st; |
1605 | |
1606 | errno = 0; |
1607 | |
1608 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); |
1609 | |
1610 | // Treat fstype "auto" as unspecified |
1611 | if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0) |
1612 | mp->mnt_type = NULL; |
1613 | |
1614 | // Might this be a virtual filesystem? |
1615 | if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) { |
1616 | char *args[35]; |
1617 | char *s; |
1618 | int n; |
1619 | // fsname: "cmd#arg1#arg2..." |
1620 | // WARNING: allows execution of arbitrary commands! |
1621 | // Try "mount 'sh#-c#sh' bogus_dir". |
1622 | // It is safe ONLY because non-root |
1623 | // cannot use two-argument mount command |
1624 | // and using one-argument "mount 'sh#-c#sh'" doesn't work: |
1625 | // "mount: can't find sh#-c#sh in /etc/fstab" |
1626 | // (if /etc/fstab has it, it's ok: root sets up /etc/fstab). |
1627 | |
1628 | s = mp->mnt_fsname; |
1629 | n = 0; |
1630 | args[n++] = s; |
1631 | while (*s && n < 35 - 2) { |
1632 | if (*s++ == '#' && *s != '#') { |
1633 | s[-1] = '\0'; |
1634 | args[n++] = s; |
1635 | } |
1636 | } |
1637 | args[n++] = mp->mnt_dir; |
1638 | args[n] = NULL; |
1639 | rc = wait4pid(xspawn(args)); |
1640 | goto report_error; |
1641 | } |
1642 | |
1643 | // Might this be an CIFS filesystem? |
1644 | if (ENABLE_FEATURE_MOUNT_CIFS |
1645 | && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0) |
1646 | && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\') |
1647 | && mp->mnt_fsname[0] == mp->mnt_fsname[1] |
1648 | ) { |
1649 | int len; |
1650 | char c; |
1651 | len_and_sockaddr *lsa; |
1652 | char *hostname, *dotted, *ip; |
1653 | |
1654 | hostname = mp->mnt_fsname + 2; |
1655 | len = strcspn(hostname, "/\\"); |
1656 | if (len == 0 || hostname[len] == '\0') |
1657 | goto report_error; |
1658 | c = hostname[len]; |
1659 | hostname[len] = '\0'; |
1660 | lsa = host2sockaddr(hostname, 0); |
1661 | hostname[len] = c; |
1662 | if (!lsa) |
1663 | goto report_error; |
1664 | |
1665 | // Insert "ip=..." option into options |
1666 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
1667 | if (ENABLE_FEATURE_CLEAN_UP) free(lsa); |
1668 | ip = xasprintf("ip=%s", dotted); |
1669 | if (ENABLE_FEATURE_CLEAN_UP) free(dotted); |
1670 | parse_mount_options(ip, &filteropts); |
1671 | if (ENABLE_FEATURE_CLEAN_UP) free(ip); |
1672 | |
1673 | // "-o mand" is required [why?] |
1674 | vfsflags |= MS_MANDLOCK; |
1675 | mp->mnt_type = (char*)"cifs"; |
1676 | rc = mount_it_now(mp, vfsflags, filteropts); |
1677 | |
1678 | goto report_error; |
1679 | } |
1680 | |
1681 | // Might this be an NFS filesystem? |
1682 | if (ENABLE_FEATURE_MOUNT_NFS |
1683 | && (!mp->mnt_type || strcmp(mp->mnt_type, "nfs") == 0) |
1684 | && strchr(mp->mnt_fsname, ':') != NULL |
1685 | ) { |
1686 | rc = nfsmount(mp, vfsflags, filteropts); |
1687 | goto report_error; |
1688 | } |
1689 | |
1690 | // Look at the file. (Not found isn't a failure for remount, or for |
1691 | // a synthetic filesystem like proc or sysfs.) |
1692 | // (We use stat, not lstat, in order to allow |
1693 | // mount symlink_to_file_or_blkdev dir) |
1694 | if (!stat(mp->mnt_fsname, &st) |
1695 | && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)) |
1696 | ) { |
1697 | // Do we need to allocate a loopback device for it? |
1698 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { |
1699 | loopFile = bb_simplify_path(mp->mnt_fsname); |
1700 | mp->mnt_fsname = NULL; // will receive malloced loop dev name |
1701 | if (set_loop(&mp->mnt_fsname, loopFile, 0) < 0) { |
1702 | if (errno == EPERM || errno == EACCES) |
1703 | bb_error_msg(bb_msg_perm_denied_are_you_root); |
1704 | else |
1705 | bb_perror_msg("can't setup loop device"); |
1706 | return errno; |
1707 | } |
1708 | |
1709 | // Autodetect bind mounts |
1710 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) |
1711 | vfsflags |= MS_BIND; |
1712 | } |
1713 | |
1714 | // If we know the fstype (or don't need to), jump straight |
1715 | // to the actual mount. |
1716 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) |
1717 | rc = mount_it_now(mp, vfsflags, filteropts); |
1718 | else { |
1719 | // Loop through filesystem types until mount succeeds |
1720 | // or we run out |
1721 | |
1722 | // Initialize list of block backed filesystems. |
1723 | // This has to be done here so that during "mount -a", |
1724 | // mounts after /proc shows up can autodetect. |
1725 | if (!fslist) { |
1726 | fslist = get_block_backed_filesystems(); |
1727 | if (ENABLE_FEATURE_CLEAN_UP && fslist) |
1728 | atexit(delete_block_backed_filesystems); |
1729 | } |
1730 | |
1731 | for (fl = fslist; fl; fl = fl->link) { |
1732 | mp->mnt_type = fl->data; |
1733 | rc = mount_it_now(mp, vfsflags, filteropts); |
1734 | if (!rc) |
1735 | break; |
1736 | } |
1737 | } |
1738 | |
1739 | // If mount failed, clean up loop file (if any). |
1740 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { |
1741 | del_loop(mp->mnt_fsname); |
1742 | if (ENABLE_FEATURE_CLEAN_UP) { |
1743 | free(loopFile); |
1744 | free(mp->mnt_fsname); |
1745 | } |
1746 | } |
1747 | |
1748 | report_error: |
1749 | if (ENABLE_FEATURE_CLEAN_UP) |
1750 | free(filteropts); |
1751 | |
1752 | if (errno == EBUSY && ignore_busy) |
1753 | return 0; |
1754 | if (rc < 0) |
1755 | bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); |
1756 | return rc; |
1757 | } |
1758 | |
1759 | // -O support |
1760 | // -O interprets a list of filter options which select whether a mount |
1761 | // point will be mounted: only mounts with options matching *all* filtering |
1762 | // options will be selected. |
1763 | // By default each -O filter option must be present in the list of mount |
1764 | // options, but if it is prefixed by "no" then it must be absent. |
1765 | // For example, |
1766 | // -O a,nob,c matches -o a,c but fails to match -o a,b,c |
1767 | // (and also fails to match -o a because -o c is absent). |
1768 | // |
1769 | // It is different from -t in that each option is matched exactly; a leading |
1770 | // "no" at the beginning of one option does not negate the rest. |
1771 | static int match_opt(const char *fs_opt_in, const char *O_opt) |
1772 | { |
1773 | if (!O_opt) |
1774 | return 1; |
1775 | |
1776 | while (*O_opt) { |
1777 | const char *fs_opt = fs_opt_in; |
1778 | int O_len; |
1779 | int match; |
1780 | |
1781 | // If option begins with "no" then treat as an inverted match: |
1782 | // matching is a failure |
1783 | match = 0; |
1784 | if (O_opt[0] == 'n' && O_opt[1] == 'o') { |
1785 | match = 1; |
1786 | O_opt += 2; |
1787 | } |
1788 | // Isolate the current O option |
1789 | O_len = strchrnul(O_opt, ',') - O_opt; |
1790 | // Check for a match against existing options |
1791 | while (1) { |
1792 | if (strncmp(fs_opt, O_opt, O_len) == 0 |
1793 | && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',') |
1794 | ) { |
1795 | if (match) |
1796 | return 0; // "no" prefix, but option found |
1797 | match = 1; // current O option found, go check next one |
1798 | break; |
1799 | } |
1800 | fs_opt = strchr(fs_opt, ','); |
1801 | if (!fs_opt) |
1802 | break; |
1803 | fs_opt++; |
1804 | } |
1805 | if (match == 0) |
1806 | return 0; // match wanted but not found |
1807 | if (O_opt[O_len] == '\0') // end? |
1808 | break; |
1809 | // Step to the next O option |
1810 | O_opt += O_len + 1; |
1811 | } |
1812 | // If we get here then everything matched |
1813 | return 1; |
1814 | } |
1815 | |
1816 | // Parse options, if necessary parse fstab/mtab, and call singlemount for |
1817 | // each directory to be mounted. |
1818 | int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
1819 | int mount_main(int argc UNUSED_PARAM, char **argv) |
1820 | { |
1821 | char *cmdopts = xzalloc(1); |
1822 | char *fstype = NULL; |
1823 | char *O_optmatch = NULL; |
1824 | char *storage_path; |
1825 | llist_t *lst_o = NULL; |
1826 | const char *fstabname; |
1827 | FILE *fstab; |
1828 | int i, j; |
1829 | int rc = EXIT_SUCCESS; |
1830 | unsigned opt; |
1831 | struct mntent mtpair[2], *mtcur = mtpair; |
1832 | IF_NOT_DESKTOP(const int nonroot = 0;) |
1833 | |
1834 | IF_DESKTOP(int nonroot = ) sanitize_env_if_suid(); |
1835 | |
1836 | // Parse long options, like --bind and --move. Note that -o option |
1837 | // and --option are synonymous. Yes, this means --remount,rw works. |
1838 | for (i = j = 1; argv[i]; i++) { |
1839 | if (argv[i][0] == '-' && argv[i][1] == '-') |
1840 | append_mount_options(&cmdopts, argv[i] + 2); |
1841 | else |
1842 | argv[j++] = argv[i]; |
1843 | } |
1844 | argv[j] = NULL; |
1845 | |
1846 | // Parse remaining options |
1847 | // Max 2 params; -o is a list, -v is a counter |
1848 | opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv"); |
1849 | opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch |
1850 | IF_FEATURE_MOUNT_VERBOSE(, &verbose)); |
1851 | while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o |
1852 | if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r |
1853 | if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w |
1854 | argv += optind; |
1855 | |
1856 | // If we have no arguments, show currently mounted filesystems |
1857 | if (!argv[0]) { |
1858 | if (!(opt & OPT_a)) { |
1859 | FILE *mountTable = setmntent(bb_path_mtab_file, "r"); |
1860 | |
1861 | if (!mountTable) |
1862 | bb_error_msg_and_die("no %s", bb_path_mtab_file); |
1863 | |
1864 | while (getmntent_r(mountTable, &mtpair[0], getmntent_buf, |
1865 | GETMNTENT_BUFSIZE)) |
1866 | { |
1867 | // Don't show rootfs. FIXME: why?? |
1868 | // util-linux 2.12a happily shows rootfs... |
1869 | //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue; |
1870 | |
1871 | if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0) |
1872 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname, |
1873 | mtpair->mnt_dir, mtpair->mnt_type, |
1874 | mtpair->mnt_opts); |
1875 | } |
1876 | if (ENABLE_FEATURE_CLEAN_UP) |
1877 | endmntent(mountTable); |
1878 | return EXIT_SUCCESS; |
1879 | } |
1880 | storage_path = NULL; |
1881 | } else { |
1882 | // When we have two arguments, the second is the directory and we can |
1883 | // skip looking at fstab entirely. We can always abspath() the directory |
1884 | // argument when we get it. |
1885 | if (argv[1]) { |
1886 | if (nonroot) |
1887 | bb_error_msg_and_die(bb_msg_you_must_be_root); |
1888 | mtpair->mnt_fsname = argv[0]; |
1889 | mtpair->mnt_dir = argv[1]; |
1890 | mtpair->mnt_type = fstype; |
1891 | mtpair->mnt_opts = cmdopts; |
1892 | resolve_mount_spec(&mtpair->mnt_fsname); |
1893 | rc = singlemount(mtpair, /*ignore_busy:*/ 0); |
1894 | return rc; |
1895 | } |
1896 | storage_path = bb_simplify_path(argv[0]); // malloced |
1897 | } |
1898 | |
1899 | // Past this point, we are handling either "mount -a [opts]" |
1900 | // or "mount [opts] single_param" |
1901 | |
1902 | i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int" |
1903 | if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags |
1904 | bb_error_msg_and_die(bb_msg_you_must_be_root); |
1905 | |
1906 | // If we have a shared subtree flag, don't worry about fstab or mtab. |
1907 | if (ENABLE_FEATURE_MOUNT_FLAGS |
1908 | && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)) |
1909 | ) { |
1910 | // verbose_mount(source, target, type, flags, data) |
1911 | rc = verbose_mount("", argv[0], "", i, ""); |
1912 | if (rc) |
1913 | bb_simple_perror_msg_and_die(argv[0]); |
1914 | return rc; |
1915 | } |
1916 | |
1917 | // Open either fstab or mtab |
1918 | fstabname = "/etc/fstab"; |
1919 | if (i & MS_REMOUNT) { |
1920 | // WARNING. I am not sure this matches util-linux's |
1921 | // behavior. It's possible util-linux does not |
1922 | // take -o opts from mtab (takes only mount source). |
1923 | fstabname = bb_path_mtab_file; |
1924 | } |
1925 | fstab = setmntent(fstabname, "r"); |
1926 | if (!fstab) |
1927 | bb_perror_msg_and_die("can't read %s", fstabname); |
1928 | |
1929 | // Loop through entries until we find what we're looking for |
1930 | memset(mtpair, 0, sizeof(mtpair)); |
1931 | for (;;) { |
1932 | struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair); |
1933 | |
1934 | // Get next fstab entry |
1935 | if (!getmntent_r(fstab, mtcur, getmntent_buf |
1936 | + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0), |
1937 | GETMNTENT_BUFSIZE/2) |
1938 | ) { // End of fstab/mtab is reached |
1939 | mtcur = mtother; // the thing we found last time |
1940 | break; |
1941 | } |
1942 | |
1943 | // If we're trying to mount something specific and this isn't it, |
1944 | // skip it. Note we must match the exact text in fstab (ala |
1945 | // "proc") or a full path from root |
1946 | if (argv[0]) { |
1947 | |
1948 | // Is this what we're looking for? |
1949 | if (strcmp(argv[0], mtcur->mnt_fsname) != 0 |
1950 | && strcmp(storage_path, mtcur->mnt_fsname) != 0 |
1951 | && strcmp(argv[0], mtcur->mnt_dir) != 0 |
1952 | && strcmp(storage_path, mtcur->mnt_dir) != 0 |
1953 | ) { |
1954 | continue; // no |
1955 | } |
1956 | |
1957 | // Remember this entry. Something later may have |
1958 | // overmounted it, and we want the _last_ match. |
1959 | mtcur = mtother; |
1960 | |
1961 | // If we're mounting all |
1962 | } else { |
1963 | struct mntent *mp; |
1964 | // No, mount -a won't mount anything, |
1965 | // even user mounts, for mere humans |
1966 | if (nonroot) |
1967 | bb_error_msg_and_die(bb_msg_you_must_be_root); |
1968 | |
1969 | // Does type match? (NULL matches always) |
1970 | if (!match_fstype(mtcur, fstype)) |
1971 | continue; |
1972 | |
1973 | // Skip noauto and swap anyway |
1974 | if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP)) |
1975 | // swap is bogus "fstype", parse_mount_options can't check fstypes |
1976 | || strcasecmp(mtcur->mnt_type, "swap") == 0 |
1977 | ) { |
1978 | continue; |
1979 | } |
1980 | |
1981 | // Does (at least one) option match? |
1982 | // (NULL matches always) |
1983 | if (!match_opt(mtcur->mnt_opts, O_optmatch)) |
1984 | continue; |
1985 | |
1986 | resolve_mount_spec(&mtcur->mnt_fsname); |
1987 | |
1988 | // NFS mounts want this to be xrealloc-able |
1989 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
1990 | |
1991 | // If nothing is mounted on this directory... |
1992 | // (otherwise repeated "mount -a" mounts everything again) |
1993 | mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0); |
1994 | // We do not check fsname match of found mount point - |
1995 | // "/" may have fsname of "/dev/root" while fstab |
1996 | // says "/dev/something_else". |
1997 | if (mp) { |
1998 | if (verbose) { |
1999 | bb_error_msg("according to %s, " |
2000 | "%s is already mounted on %s", |
2001 | bb_path_mtab_file, |
2002 | mp->mnt_fsname, mp->mnt_dir); |
2003 | } |
2004 | } else { |
2005 | // ...mount this thing |
2006 | if (singlemount(mtcur, /*ignore_busy:*/ 1)) { |
2007 | // Count number of failed mounts |
2008 | rc++; |
2009 | } |
2010 | } |
2011 | free(mtcur->mnt_opts); |
2012 | } |
2013 | } |
2014 | |
2015 | // End of fstab/mtab is reached. |
2016 | // Were we looking for something specific? |
2017 | if (argv[0]) { // yes |
2018 | long l; |
2019 | |
2020 | // If we didn't find anything, complain |
2021 | if (!mtcur->mnt_fsname) |
2022 | bb_error_msg_and_die("can't find %s in %s", |
2023 | argv[0], fstabname); |
2024 | |
2025 | // What happens when we try to "mount swap_partition"? |
2026 | // (fstab containts "swap_partition swap swap defaults 0 0") |
2027 | // util-linux-ng 2.13.1 does this: |
2028 | // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory) |
2029 | // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory) |
2030 | // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory) |
2031 | // write(2, "mount: mount point swap does not exist\n", 39) = 39 |
2032 | // exit_group(32) = ? |
2033 | #if 0 |
2034 | // In case we want to simply skip swap partitions: |
2035 | l = parse_mount_options(mtcur->mnt_opts, NULL); |
2036 | if ((l & MOUNT_SWAP) |
2037 | // swap is bogus "fstype", parse_mount_options can't check fstypes |
2038 | || strcasecmp(mtcur->mnt_type, "swap") == 0 |
2039 | ) { |
2040 | goto ret; |
2041 | } |
2042 | #endif |
2043 | if (nonroot) { |
2044 | // fstab must have "users" or "user" |
2045 | l = parse_mount_options(mtcur->mnt_opts, NULL); |
2046 | if (!(l & MOUNT_USERS)) |
2047 | bb_error_msg_and_die(bb_msg_you_must_be_root); |
2048 | } |
2049 | |
2050 | //util-linux-2.12 does not do this check. |
2051 | //// If nothing is mounted on this directory... |
2052 | //// (otherwise repeated "mount FOO" mounts FOO again) |
2053 | //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0); |
2054 | //if (mp) { |
2055 | // bb_error_msg("according to %s, " |
2056 | // "%s is already mounted on %s", |
2057 | // bb_path_mtab_file, |
2058 | // mp->mnt_fsname, mp->mnt_dir); |
2059 | //} else { |
2060 | // ...mount the last thing we found |
2061 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
2062 | append_mount_options(&(mtcur->mnt_opts), cmdopts); |
2063 | resolve_mount_spec(&mtpair->mnt_fsname); |
2064 | rc = singlemount(mtcur, /*ignore_busy:*/ 0); |
2065 | if (ENABLE_FEATURE_CLEAN_UP) |
2066 | free(mtcur->mnt_opts); |
2067 | //} |
2068 | } |
2069 | |
2070 | //ret: |
2071 | if (ENABLE_FEATURE_CLEAN_UP) |
2072 | endmntent(fstab); |
2073 | if (ENABLE_FEATURE_CLEAN_UP) { |
2074 | free(storage_path); |
2075 | free(cmdopts); |
2076 | } |
2077 | |
2078 | //TODO: exitcode should be ORed mask of (from "man mount"): |
2079 | // 0 success |
2080 | // 1 incorrect invocation or permissions |
2081 | // 2 system error (out of memory, cannot fork, no more loop devices) |
2082 | // 4 internal mount bug or missing nfs support in mount |
2083 | // 8 user interrupt |
2084 | //16 problems writing or locking /etc/mtab |
2085 | //32 mount failure |
2086 | //64 some mount succeeded |
2087 | return rc; |
2088 | } |