Contents of /tags/mkinitrd-6_1_1/busybox/util-linux/mount.c
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 47905 byte(s)
tagged 'mkinitrd-6_1_1'
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 | |
12 | /* Design notes: There is no spec for mount. Remind me to write one. |
13 | |
14 | mount_main() calls singlemount() which calls mount_it_now(). |
15 | |
16 | mount_main() can loop through /etc/fstab for mount -a |
17 | singlemount() can loop through /etc/filesystems for fstype detection. |
18 | mount_it_now() does the actual mount. |
19 | */ |
20 | |
21 | #include <mntent.h> |
22 | #include <syslog.h> |
23 | #include "libbb.h" |
24 | |
25 | #if ENABLE_FEATURE_MOUNT_LABEL |
26 | #include "volume_id.h" |
27 | #endif |
28 | |
29 | /* Needed for nfs support only */ |
30 | #include <sys/utsname.h> |
31 | #undef TRUE |
32 | #undef FALSE |
33 | #include <rpc/rpc.h> |
34 | #include <rpc/pmap_prot.h> |
35 | #include <rpc/pmap_clnt.h> |
36 | |
37 | #ifndef MS_SILENT |
38 | #define MS_SILENT (1 << 15) |
39 | #endif |
40 | /* Grab more as needed from util-linux's mount/mount_constants.h */ |
41 | #ifndef MS_DIRSYNC |
42 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ |
43 | #endif |
44 | |
45 | |
46 | #if defined(__dietlibc__) |
47 | /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi) |
48 | * dietlibc-0.30 does not have implementation of getmntent_r() */ |
49 | static struct mntent *getmntent_r(FILE* stream, struct mntent* result, |
50 | char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM) |
51 | { |
52 | struct mntent* ment = getmntent(stream); |
53 | return memcpy(result, ment, sizeof(*ment)); |
54 | } |
55 | #endif |
56 | |
57 | |
58 | // Not real flags, but we want to be able to check for this. |
59 | enum { |
60 | MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP, |
61 | MOUNT_NOAUTO = (1 << 29), |
62 | MOUNT_SWAP = (1 << 30), |
63 | }; |
64 | |
65 | |
66 | #define OPTION_STR "o:t:rwanfvsi" |
67 | enum { |
68 | OPT_o = (1 << 0), |
69 | OPT_t = (1 << 1), |
70 | OPT_r = (1 << 2), |
71 | OPT_w = (1 << 3), |
72 | OPT_a = (1 << 4), |
73 | OPT_n = (1 << 5), |
74 | OPT_f = (1 << 6), |
75 | OPT_v = (1 << 7), |
76 | OPT_s = (1 << 8), |
77 | OPT_i = (1 << 9), |
78 | }; |
79 | |
80 | #if ENABLE_FEATURE_MTAB_SUPPORT |
81 | #define useMtab (!(option_mask32 & OPT_n)) |
82 | #else |
83 | #define useMtab 0 |
84 | #endif |
85 | |
86 | #if ENABLE_FEATURE_MOUNT_FAKE |
87 | #define fakeIt (option_mask32 & OPT_f) |
88 | #else |
89 | #define fakeIt 0 |
90 | #endif |
91 | |
92 | |
93 | // TODO: more "user" flag compatibility. |
94 | // "user" option (from mount manpage): |
95 | // Only the user that mounted a filesystem can unmount it again. |
96 | // If any user should be able to unmount, then use users instead of user |
97 | // in the fstab line. The owner option is similar to the user option, |
98 | // with the restriction that the user must be the owner of the special file. |
99 | // This may be useful e.g. for /dev/fd if a login script makes |
100 | // the console user owner of this device. |
101 | |
102 | /* Standard mount options (from -o options or --options), with corresponding |
103 | * flags */ |
104 | |
105 | static const int32_t mount_options[] = { |
106 | // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. |
107 | |
108 | USE_FEATURE_MOUNT_LOOP( |
109 | /* "loop" */ 0, |
110 | ) |
111 | |
112 | USE_FEATURE_MOUNT_FSTAB( |
113 | /* "defaults" */ 0, |
114 | /* "quiet" 0 - do not filter out, vfat wants to see it */ |
115 | /* "noauto" */ MOUNT_NOAUTO, |
116 | /* "sw" */ MOUNT_SWAP, |
117 | /* "swap" */ MOUNT_SWAP, |
118 | USE_DESKTOP(/* "user" */ MOUNT_USERS,) |
119 | USE_DESKTOP(/* "users" */ MOUNT_USERS,) |
120 | /* "_netdev" */ 0, |
121 | ) |
122 | |
123 | USE_FEATURE_MOUNT_FLAGS( |
124 | // vfs flags |
125 | /* "nosuid" */ MS_NOSUID, |
126 | /* "suid" */ ~MS_NOSUID, |
127 | /* "dev" */ ~MS_NODEV, |
128 | /* "nodev" */ MS_NODEV, |
129 | /* "exec" */ ~MS_NOEXEC, |
130 | /* "noexec" */ MS_NOEXEC, |
131 | /* "sync" */ MS_SYNCHRONOUS, |
132 | /* "dirsync" */ MS_DIRSYNC, |
133 | /* "async" */ ~MS_SYNCHRONOUS, |
134 | /* "atime" */ ~MS_NOATIME, |
135 | /* "noatime" */ MS_NOATIME, |
136 | /* "diratime" */ ~MS_NODIRATIME, |
137 | /* "nodiratime" */ MS_NODIRATIME, |
138 | /* "mand" */ MS_MANDLOCK, |
139 | /* "nomand" */ ~MS_MANDLOCK, |
140 | /* "relatime" */ MS_RELATIME, |
141 | /* "norelatime" */ ~MS_RELATIME, |
142 | /* "loud" */ ~MS_SILENT, |
143 | |
144 | // action flags |
145 | /* "bind" */ MS_BIND, |
146 | /* "move" */ MS_MOVE, |
147 | /* "shared" */ MS_SHARED, |
148 | /* "slave" */ MS_SLAVE, |
149 | /* "private" */ MS_PRIVATE, |
150 | /* "unbindable" */ MS_UNBINDABLE, |
151 | /* "rshared" */ MS_SHARED|MS_RECURSIVE, |
152 | /* "rslave" */ MS_SLAVE|MS_RECURSIVE, |
153 | /* "rprivate" */ MS_SLAVE|MS_RECURSIVE, |
154 | /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE, |
155 | ) |
156 | |
157 | // Always understood. |
158 | /* "ro" */ MS_RDONLY, // vfs flag |
159 | /* "rw" */ ~MS_RDONLY, // vfs flag |
160 | /* "remount" */ MS_REMOUNT // action flag |
161 | }; |
162 | |
163 | static const char mount_option_str[] = |
164 | USE_FEATURE_MOUNT_LOOP( |
165 | "loop" "\0" |
166 | ) |
167 | USE_FEATURE_MOUNT_FSTAB( |
168 | "defaults" "\0" |
169 | /* "quiet" "\0" - do not filter out, vfat wants to see it */ |
170 | "noauto" "\0" |
171 | "sw" "\0" |
172 | "swap" "\0" |
173 | USE_DESKTOP("user" "\0") |
174 | USE_DESKTOP("users" "\0") |
175 | "_netdev" "\0" |
176 | ) |
177 | USE_FEATURE_MOUNT_FLAGS( |
178 | // vfs flags |
179 | "nosuid" "\0" |
180 | "suid" "\0" |
181 | "dev" "\0" |
182 | "nodev" "\0" |
183 | "exec" "\0" |
184 | "noexec" "\0" |
185 | "sync" "\0" |
186 | "dirsync" "\0" |
187 | "async" "\0" |
188 | "atime" "\0" |
189 | "noatime" "\0" |
190 | "diratime" "\0" |
191 | "nodiratime" "\0" |
192 | "mand" "\0" |
193 | "nomand" "\0" |
194 | "relatime" "\0" |
195 | "norelatime" "\0" |
196 | "loud" "\0" |
197 | |
198 | // action flags |
199 | "bind" "\0" |
200 | "move" "\0" |
201 | "shared" "\0" |
202 | "slave" "\0" |
203 | "private" "\0" |
204 | "unbindable" "\0" |
205 | "rshared" "\0" |
206 | "rslave" "\0" |
207 | "rprivate" "\0" |
208 | "runbindable" "\0" |
209 | ) |
210 | |
211 | // Always understood. |
212 | "ro" "\0" // vfs flag |
213 | "rw" "\0" // vfs flag |
214 | "remount" "\0" // action flag |
215 | ; |
216 | |
217 | |
218 | struct globals { |
219 | #if ENABLE_FEATURE_MOUNT_NFS |
220 | smalluint nfs_mount_version; |
221 | #endif |
222 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
223 | unsigned verbose; |
224 | #endif |
225 | llist_t *fslist; |
226 | char getmntent_buf[1]; |
227 | |
228 | }; |
229 | enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) }; |
230 | #define G (*(struct globals*)&bb_common_bufsiz1) |
231 | #define nfs_mount_version (G.nfs_mount_version) |
232 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
233 | #define verbose (G.verbose ) |
234 | #else |
235 | #define verbose 0 |
236 | #endif |
237 | #define fslist (G.fslist ) |
238 | #define getmntent_buf (G.getmntent_buf ) |
239 | |
240 | |
241 | #if ENABLE_FEATURE_MOUNT_VERBOSE |
242 | static int verbose_mount(const char *source, const char *target, |
243 | const char *filesystemtype, |
244 | unsigned long mountflags, const void *data) |
245 | { |
246 | int rc; |
247 | |
248 | errno = 0; |
249 | rc = mount(source, target, filesystemtype, mountflags, data); |
250 | if (verbose >= 2) |
251 | bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d", |
252 | source, target, filesystemtype, |
253 | mountflags, (char*)data, rc); |
254 | return rc; |
255 | } |
256 | #else |
257 | #define verbose_mount(...) mount(__VA_ARGS__) |
258 | #endif |
259 | |
260 | static int resolve_mount_spec(char **fsname) |
261 | { |
262 | char *tmp = NULL; |
263 | |
264 | #if ENABLE_FEATURE_MOUNT_LABEL |
265 | if (!strncmp(*fsname, "UUID=", 5)) |
266 | tmp = get_devname_from_uuid(*fsname + 5); |
267 | else if (!strncmp(*fsname, "LABEL=", 6)) |
268 | tmp = get_devname_from_label(*fsname + 6); |
269 | #endif |
270 | |
271 | if (tmp) { |
272 | *fsname = tmp; |
273 | return 1; |
274 | } |
275 | return 0; |
276 | } |
277 | |
278 | /* Append mount options to string */ |
279 | static void append_mount_options(char **oldopts, const char *newopts) |
280 | { |
281 | if (*oldopts && **oldopts) { |
282 | /* do not insert options which are already there */ |
283 | while (newopts[0]) { |
284 | char *p; |
285 | int len = strlen(newopts); |
286 | p = strchr(newopts, ','); |
287 | if (p) len = p - newopts; |
288 | p = *oldopts; |
289 | while (1) { |
290 | if (!strncmp(p, newopts, len) |
291 | && (p[len] == ',' || p[len] == '\0')) |
292 | goto skip; |
293 | p = strchr(p,','); |
294 | if (!p) break; |
295 | p++; |
296 | } |
297 | p = xasprintf("%s,%.*s", *oldopts, len, newopts); |
298 | free(*oldopts); |
299 | *oldopts = p; |
300 | skip: |
301 | newopts += len; |
302 | while (newopts[0] == ',') newopts++; |
303 | } |
304 | } else { |
305 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts); |
306 | *oldopts = xstrdup(newopts); |
307 | } |
308 | } |
309 | |
310 | /* Use the mount_options list to parse options into flags. |
311 | * Also return list of unrecognized options if unrecognized!=NULL */ |
312 | static long parse_mount_options(char *options, char **unrecognized) |
313 | { |
314 | long flags = MS_SILENT; |
315 | |
316 | // Loop through options |
317 | for (;;) { |
318 | unsigned i; |
319 | char *comma = strchr(options, ','); |
320 | const char *option_str = mount_option_str; |
321 | |
322 | if (comma) *comma = '\0'; |
323 | |
324 | /* FIXME: use hasmntopt() */ |
325 | // Find this option in mount_options |
326 | for (i = 0; i < ARRAY_SIZE(mount_options); i++) { |
327 | if (!strcasecmp(option_str, options)) { |
328 | long fl = mount_options[i]; |
329 | if (fl < 0) flags &= fl; |
330 | else flags |= fl; |
331 | break; |
332 | } |
333 | option_str += strlen(option_str) + 1; |
334 | } |
335 | // If unrecognized not NULL, append unrecognized mount options */ |
336 | if (unrecognized && i == ARRAY_SIZE(mount_options)) { |
337 | // Add it to strflags, to pass on to kernel |
338 | i = *unrecognized ? strlen(*unrecognized) : 0; |
339 | *unrecognized = xrealloc(*unrecognized, i + strlen(options) + 2); |
340 | |
341 | // Comma separated if it's not the first one |
342 | if (i) (*unrecognized)[i++] = ','; |
343 | strcpy((*unrecognized)+i, options); |
344 | } |
345 | |
346 | if (!comma) |
347 | break; |
348 | // Advance to next option |
349 | *comma = ','; |
350 | options = ++comma; |
351 | } |
352 | |
353 | return flags; |
354 | } |
355 | |
356 | // Return a list of all block device backed filesystems |
357 | |
358 | static llist_t *get_block_backed_filesystems(void) |
359 | { |
360 | static const char filesystems[2][sizeof("/proc/filesystems")] = { |
361 | "/etc/filesystems", |
362 | "/proc/filesystems", |
363 | }; |
364 | char *fs, *buf; |
365 | llist_t *list = 0; |
366 | int i; |
367 | FILE *f; |
368 | |
369 | for (i = 0; i < 2; i++) { |
370 | f = fopen_for_read(filesystems[i]); |
371 | if (!f) continue; |
372 | |
373 | while ((buf = xmalloc_fgetline(f)) != NULL) { |
374 | if (!strncmp(buf, "nodev", 5) && isspace(buf[5])) |
375 | continue; |
376 | fs = skip_whitespace(buf); |
377 | if (*fs=='#' || *fs=='*' || !*fs) continue; |
378 | |
379 | llist_add_to_end(&list, xstrdup(fs)); |
380 | free(buf); |
381 | } |
382 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f); |
383 | } |
384 | |
385 | return list; |
386 | } |
387 | |
388 | #if ENABLE_FEATURE_CLEAN_UP |
389 | static void delete_block_backed_filesystems(void) |
390 | { |
391 | llist_free(fslist, free); |
392 | } |
393 | #else |
394 | void delete_block_backed_filesystems(void); |
395 | #endif |
396 | |
397 | // Perform actual mount of specific filesystem at specific location. |
398 | // NB: mp->xxx fields may be trashed on exit |
399 | static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts) |
400 | { |
401 | int rc = 0; |
402 | |
403 | if (fakeIt) { |
404 | if (verbose >= 2) |
405 | bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')", |
406 | mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
407 | vfsflags, filteropts); |
408 | goto mtab; |
409 | } |
410 | |
411 | // Mount, with fallback to read-only if necessary. |
412 | for (;;) { |
413 | errno = 0; |
414 | rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
415 | vfsflags, filteropts); |
416 | |
417 | // If mount failed, try |
418 | // helper program mount.<mnt_type> |
419 | if (ENABLE_FEATURE_MOUNT_HELPERS && rc) { |
420 | char *args[6]; |
421 | int errno_save = errno; |
422 | args[0] = xasprintf("mount.%s", mp->mnt_type); |
423 | rc = 1; |
424 | if (filteropts) { |
425 | args[rc++] = (char *)"-o"; |
426 | args[rc++] = filteropts; |
427 | } |
428 | args[rc++] = mp->mnt_fsname; |
429 | args[rc++] = mp->mnt_dir; |
430 | args[rc] = NULL; |
431 | rc = wait4pid(spawn(args)); |
432 | free(args[0]); |
433 | if (!rc) |
434 | break; |
435 | errno = errno_save; |
436 | } |
437 | |
438 | if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS)) |
439 | break; |
440 | if (!(vfsflags & MS_SILENT)) |
441 | bb_error_msg("%s is write-protected, mounting read-only", |
442 | mp->mnt_fsname); |
443 | vfsflags |= MS_RDONLY; |
444 | } |
445 | |
446 | // Abort entirely if permission denied. |
447 | |
448 | if (rc && errno == EPERM) |
449 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
450 | |
451 | /* If the mount was successful, and we're maintaining an old-style |
452 | * mtab file by hand, add the new entry to it now. */ |
453 | mtab: |
454 | if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) { |
455 | char *fsname; |
456 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); |
457 | const char *option_str = mount_option_str; |
458 | int i; |
459 | |
460 | if (!mountTable) { |
461 | bb_error_msg("no %s", bb_path_mtab_file); |
462 | goto ret; |
463 | } |
464 | |
465 | // Add vfs string flags |
466 | |
467 | for (i = 0; mount_options[i] != MS_REMOUNT; i++) { |
468 | if (mount_options[i] > 0 && (mount_options[i] & vfsflags)) |
469 | append_mount_options(&(mp->mnt_opts), option_str); |
470 | option_str += strlen(option_str) + 1; |
471 | } |
472 | |
473 | // Remove trailing / (if any) from directory we mounted on |
474 | |
475 | i = strlen(mp->mnt_dir) - 1; |
476 | if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0'; |
477 | |
478 | // Convert to canonical pathnames as needed |
479 | |
480 | mp->mnt_dir = bb_simplify_path(mp->mnt_dir); |
481 | fsname = 0; |
482 | if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */ |
483 | mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); |
484 | mp->mnt_type = (char*)"bind"; |
485 | } |
486 | mp->mnt_freq = mp->mnt_passno = 0; |
487 | |
488 | // Write and close. |
489 | |
490 | addmntent(mountTable, mp); |
491 | endmntent(mountTable); |
492 | if (ENABLE_FEATURE_CLEAN_UP) { |
493 | free(mp->mnt_dir); |
494 | free(fsname); |
495 | } |
496 | } |
497 | ret: |
498 | return rc; |
499 | } |
500 | |
501 | #if ENABLE_FEATURE_MOUNT_NFS |
502 | |
503 | /* |
504 | * Linux NFS mount |
505 | * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> |
506 | * |
507 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
508 | * |
509 | * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port |
510 | * numbers to be specified on the command line. |
511 | * |
512 | * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>: |
513 | * Omit the call to connect() for Linux version 1.3.11 or later. |
514 | * |
515 | * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com> |
516 | * Implemented the "bg", "fg" and "retry" mount options for NFS. |
517 | * |
518 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org> |
519 | * - added Native Language Support |
520 | * |
521 | * Modified by Olaf Kirch and Trond Myklebust for new NFS code, |
522 | * plus NFSv3 stuff. |
523 | */ |
524 | |
525 | /* This is just a warning of a common mistake. Possibly this should be a |
526 | * uclibc faq entry rather than in busybox... */ |
527 | #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__) |
528 | #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support." |
529 | #endif |
530 | |
531 | #define MOUNTPORT 635 |
532 | #define MNTPATHLEN 1024 |
533 | #define MNTNAMLEN 255 |
534 | #define FHSIZE 32 |
535 | #define FHSIZE3 64 |
536 | |
537 | typedef char fhandle[FHSIZE]; |
538 | |
539 | typedef struct { |
540 | unsigned int fhandle3_len; |
541 | char *fhandle3_val; |
542 | } fhandle3; |
543 | |
544 | enum mountstat3 { |
545 | MNT_OK = 0, |
546 | MNT3ERR_PERM = 1, |
547 | MNT3ERR_NOENT = 2, |
548 | MNT3ERR_IO = 5, |
549 | MNT3ERR_ACCES = 13, |
550 | MNT3ERR_NOTDIR = 20, |
551 | MNT3ERR_INVAL = 22, |
552 | MNT3ERR_NAMETOOLONG = 63, |
553 | MNT3ERR_NOTSUPP = 10004, |
554 | MNT3ERR_SERVERFAULT = 10006, |
555 | }; |
556 | typedef enum mountstat3 mountstat3; |
557 | |
558 | struct fhstatus { |
559 | unsigned int fhs_status; |
560 | union { |
561 | fhandle fhs_fhandle; |
562 | } fhstatus_u; |
563 | }; |
564 | typedef struct fhstatus fhstatus; |
565 | |
566 | struct mountres3_ok { |
567 | fhandle3 fhandle; |
568 | struct { |
569 | unsigned int auth_flavours_len; |
570 | char *auth_flavours_val; |
571 | } auth_flavours; |
572 | }; |
573 | typedef struct mountres3_ok mountres3_ok; |
574 | |
575 | struct mountres3 { |
576 | mountstat3 fhs_status; |
577 | union { |
578 | mountres3_ok mountinfo; |
579 | } mountres3_u; |
580 | }; |
581 | typedef struct mountres3 mountres3; |
582 | |
583 | typedef char *dirpath; |
584 | |
585 | typedef char *name; |
586 | |
587 | typedef struct mountbody *mountlist; |
588 | |
589 | struct mountbody { |
590 | name ml_hostname; |
591 | dirpath ml_directory; |
592 | mountlist ml_next; |
593 | }; |
594 | typedef struct mountbody mountbody; |
595 | |
596 | typedef struct groupnode *groups; |
597 | |
598 | struct groupnode { |
599 | name gr_name; |
600 | groups gr_next; |
601 | }; |
602 | typedef struct groupnode groupnode; |
603 | |
604 | typedef struct exportnode *exports; |
605 | |
606 | struct exportnode { |
607 | dirpath ex_dir; |
608 | groups ex_groups; |
609 | exports ex_next; |
610 | }; |
611 | typedef struct exportnode exportnode; |
612 | |
613 | struct ppathcnf { |
614 | int pc_link_max; |
615 | short pc_max_canon; |
616 | short pc_max_input; |
617 | short pc_name_max; |
618 | short pc_path_max; |
619 | short pc_pipe_buf; |
620 | uint8_t pc_vdisable; |
621 | char pc_xxx; |
622 | short pc_mask[2]; |
623 | }; |
624 | typedef struct ppathcnf ppathcnf; |
625 | |
626 | #define MOUNTPROG 100005 |
627 | #define MOUNTVERS 1 |
628 | |
629 | #define MOUNTPROC_NULL 0 |
630 | #define MOUNTPROC_MNT 1 |
631 | #define MOUNTPROC_DUMP 2 |
632 | #define MOUNTPROC_UMNT 3 |
633 | #define MOUNTPROC_UMNTALL 4 |
634 | #define MOUNTPROC_EXPORT 5 |
635 | #define MOUNTPROC_EXPORTALL 6 |
636 | |
637 | #define MOUNTVERS_POSIX 2 |
638 | |
639 | #define MOUNTPROC_PATHCONF 7 |
640 | |
641 | #define MOUNT_V3 3 |
642 | |
643 | #define MOUNTPROC3_NULL 0 |
644 | #define MOUNTPROC3_MNT 1 |
645 | #define MOUNTPROC3_DUMP 2 |
646 | #define MOUNTPROC3_UMNT 3 |
647 | #define MOUNTPROC3_UMNTALL 4 |
648 | #define MOUNTPROC3_EXPORT 5 |
649 | |
650 | enum { |
651 | #ifndef NFS_FHSIZE |
652 | NFS_FHSIZE = 32, |
653 | #endif |
654 | #ifndef NFS_PORT |
655 | NFS_PORT = 2049 |
656 | #endif |
657 | }; |
658 | |
659 | /* |
660 | * We want to be able to compile mount on old kernels in such a way |
661 | * that the binary will work well on more recent kernels. |
662 | * Thus, if necessary we teach nfsmount.c the structure of new fields |
663 | * that will come later. |
664 | * |
665 | * Moreover, the new kernel includes conflict with glibc includes |
666 | * so it is easiest to ignore the kernel altogether (at compile time). |
667 | */ |
668 | |
669 | struct nfs2_fh { |
670 | char data[32]; |
671 | }; |
672 | struct nfs3_fh { |
673 | unsigned short size; |
674 | unsigned char data[64]; |
675 | }; |
676 | |
677 | struct nfs_mount_data { |
678 | int version; /* 1 */ |
679 | int fd; /* 1 */ |
680 | struct nfs2_fh old_root; /* 1 */ |
681 | int flags; /* 1 */ |
682 | int rsize; /* 1 */ |
683 | int wsize; /* 1 */ |
684 | int timeo; /* 1 */ |
685 | int retrans; /* 1 */ |
686 | int acregmin; /* 1 */ |
687 | int acregmax; /* 1 */ |
688 | int acdirmin; /* 1 */ |
689 | int acdirmax; /* 1 */ |
690 | struct sockaddr_in addr; /* 1 */ |
691 | char hostname[256]; /* 1 */ |
692 | int namlen; /* 2 */ |
693 | unsigned int bsize; /* 3 */ |
694 | struct nfs3_fh root; /* 4 */ |
695 | }; |
696 | |
697 | /* bits in the flags field */ |
698 | enum { |
699 | NFS_MOUNT_SOFT = 0x0001, /* 1 */ |
700 | NFS_MOUNT_INTR = 0x0002, /* 1 */ |
701 | NFS_MOUNT_SECURE = 0x0004, /* 1 */ |
702 | NFS_MOUNT_POSIX = 0x0008, /* 1 */ |
703 | NFS_MOUNT_NOCTO = 0x0010, /* 1 */ |
704 | NFS_MOUNT_NOAC = 0x0020, /* 1 */ |
705 | NFS_MOUNT_TCP = 0x0040, /* 2 */ |
706 | NFS_MOUNT_VER3 = 0x0080, /* 3 */ |
707 | NFS_MOUNT_KERBEROS = 0x0100, /* 3 */ |
708 | NFS_MOUNT_NONLM = 0x0200, /* 3 */ |
709 | NFS_MOUNT_NORDIRPLUS = 0x4000 |
710 | }; |
711 | |
712 | |
713 | /* |
714 | * We need to translate between nfs status return values and |
715 | * the local errno values which may not be the same. |
716 | * |
717 | * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno: |
718 | * "after #include <errno.h> the symbol errno is reserved for any use, |
719 | * it cannot even be used as a struct tag or field name". |
720 | */ |
721 | |
722 | #ifndef EDQUOT |
723 | #define EDQUOT ENOSPC |
724 | #endif |
725 | |
726 | // Convert each NFSERR_BLAH into EBLAH |
727 | |
728 | static const struct { |
729 | short stat; |
730 | short errnum; |
731 | } nfs_errtbl[] = { |
732 | {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST}, |
733 | {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG}, |
734 | {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT}, |
735 | {70,ESTALE}, {71,EREMOTE}, {-1,EIO} |
736 | }; |
737 | |
738 | static char *nfs_strerror(int status) |
739 | { |
740 | int i; |
741 | |
742 | for (i = 0; nfs_errtbl[i].stat != -1; i++) { |
743 | if (nfs_errtbl[i].stat == status) |
744 | return strerror(nfs_errtbl[i].errnum); |
745 | } |
746 | return xasprintf("unknown nfs status return value: %d", status); |
747 | } |
748 | |
749 | static bool_t xdr_fhandle(XDR *xdrs, fhandle objp) |
750 | { |
751 | if (!xdr_opaque(xdrs, objp, FHSIZE)) |
752 | return FALSE; |
753 | return TRUE; |
754 | } |
755 | |
756 | static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp) |
757 | { |
758 | if (!xdr_u_int(xdrs, &objp->fhs_status)) |
759 | return FALSE; |
760 | switch (objp->fhs_status) { |
761 | case 0: |
762 | if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle)) |
763 | return FALSE; |
764 | break; |
765 | default: |
766 | break; |
767 | } |
768 | return TRUE; |
769 | } |
770 | |
771 | static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp) |
772 | { |
773 | if (!xdr_string(xdrs, objp, MNTPATHLEN)) |
774 | return FALSE; |
775 | return TRUE; |
776 | } |
777 | |
778 | static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp) |
779 | { |
780 | if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3)) |
781 | return FALSE; |
782 | return TRUE; |
783 | } |
784 | |
785 | static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp) |
786 | { |
787 | if (!xdr_fhandle3(xdrs, &objp->fhandle)) |
788 | return FALSE; |
789 | if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0, |
790 | sizeof (int), (xdrproc_t) xdr_int)) |
791 | return FALSE; |
792 | return TRUE; |
793 | } |
794 | |
795 | static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp) |
796 | { |
797 | if (!xdr_enum(xdrs, (enum_t *) objp)) |
798 | return FALSE; |
799 | return TRUE; |
800 | } |
801 | |
802 | static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp) |
803 | { |
804 | if (!xdr_mountstat3(xdrs, &objp->fhs_status)) |
805 | return FALSE; |
806 | switch (objp->fhs_status) { |
807 | case MNT_OK: |
808 | if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo)) |
809 | return FALSE; |
810 | break; |
811 | default: |
812 | break; |
813 | } |
814 | return TRUE; |
815 | } |
816 | |
817 | #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) |
818 | |
819 | /* |
820 | * Unfortunately, the kernel prints annoying console messages |
821 | * in case of an unexpected nfs mount version (instead of |
822 | * just returning some error). Therefore we'll have to try |
823 | * and figure out what version the kernel expects. |
824 | * |
825 | * Variables: |
826 | * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time |
827 | * NFS_MOUNT_VERSION: these nfsmount sources at compile time |
828 | * nfs_mount_version: version this source and running kernel can handle |
829 | */ |
830 | static void |
831 | find_kernel_nfs_mount_version(void) |
832 | { |
833 | int kernel_version; |
834 | |
835 | if (nfs_mount_version) |
836 | return; |
837 | |
838 | nfs_mount_version = 4; /* default */ |
839 | |
840 | kernel_version = get_linux_version_code(); |
841 | if (kernel_version) { |
842 | if (kernel_version < KERNEL_VERSION(2,1,32)) |
843 | nfs_mount_version = 1; |
844 | else if (kernel_version < KERNEL_VERSION(2,2,18) || |
845 | (kernel_version >= KERNEL_VERSION(2,3,0) && |
846 | kernel_version < KERNEL_VERSION(2,3,99))) |
847 | nfs_mount_version = 3; |
848 | /* else v4 since 2.3.99pre4 */ |
849 | } |
850 | } |
851 | |
852 | static void |
853 | get_mountport(struct pmap *pm_mnt, |
854 | struct sockaddr_in *server_addr, |
855 | long unsigned prog, |
856 | long unsigned version, |
857 | long unsigned proto, |
858 | long unsigned port) |
859 | { |
860 | struct pmaplist *pmap; |
861 | |
862 | server_addr->sin_port = PMAPPORT; |
863 | /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *). |
864 | * I understand it like "IPv6 for this is not 100% ready" */ |
865 | pmap = pmap_getmaps(server_addr); |
866 | |
867 | if (version > MAX_NFSPROT) |
868 | version = MAX_NFSPROT; |
869 | if (!prog) |
870 | prog = MOUNTPROG; |
871 | pm_mnt->pm_prog = prog; |
872 | pm_mnt->pm_vers = version; |
873 | pm_mnt->pm_prot = proto; |
874 | pm_mnt->pm_port = port; |
875 | |
876 | while (pmap) { |
877 | if (pmap->pml_map.pm_prog != prog) |
878 | goto next; |
879 | if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers) |
880 | goto next; |
881 | if (version > 2 && pmap->pml_map.pm_vers != version) |
882 | goto next; |
883 | if (version && version <= 2 && pmap->pml_map.pm_vers > 2) |
884 | goto next; |
885 | if (pmap->pml_map.pm_vers > MAX_NFSPROT || |
886 | (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) || |
887 | (port && pmap->pml_map.pm_port != port)) |
888 | goto next; |
889 | memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt)); |
890 | next: |
891 | pmap = pmap->pml_next; |
892 | } |
893 | if (!pm_mnt->pm_vers) |
894 | pm_mnt->pm_vers = MOUNTVERS; |
895 | if (!pm_mnt->pm_port) |
896 | pm_mnt->pm_port = MOUNTPORT; |
897 | if (!pm_mnt->pm_prot) |
898 | pm_mnt->pm_prot = IPPROTO_TCP; |
899 | } |
900 | |
901 | #if BB_MMU |
902 | static int daemonize(void) |
903 | { |
904 | int pid = fork(); |
905 | if (pid < 0) /* error */ |
906 | return -errno; |
907 | if (pid > 0) /* parent */ |
908 | return 0; |
909 | /* child */ |
910 | close(0); |
911 | xopen(bb_dev_null, O_RDWR); |
912 | xdup2(0, 1); |
913 | xdup2(0, 2); |
914 | setsid(); |
915 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
916 | logmode = LOGMODE_SYSLOG; |
917 | return 1; |
918 | } |
919 | #else |
920 | static inline int daemonize(void) { return -ENOSYS; } |
921 | #endif |
922 | |
923 | // TODO |
924 | static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM) |
925 | { |
926 | return 0; |
927 | } |
928 | |
929 | /* RPC strerror analogs are terminally idiotic: |
930 | * *mandatory* prefix and \n at end. |
931 | * This hopefully helps. Usage: |
932 | * error_msg_rpc(clnt_*error*(" ")) */ |
933 | static void error_msg_rpc(const char *msg) |
934 | { |
935 | int len; |
936 | while (msg[0] == ' ' || msg[0] == ':') msg++; |
937 | len = strlen(msg); |
938 | while (len && msg[len-1] == '\n') len--; |
939 | bb_error_msg("%.*s", len, msg); |
940 | } |
941 | |
942 | // NB: mp->xxx fields may be trashed on exit |
943 | static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) |
944 | { |
945 | CLIENT *mclient; |
946 | char *hostname; |
947 | char *pathname; |
948 | char *mounthost; |
949 | struct nfs_mount_data data; |
950 | char *opt; |
951 | struct hostent *hp; |
952 | struct sockaddr_in server_addr; |
953 | struct sockaddr_in mount_server_addr; |
954 | int msock, fsock; |
955 | union { |
956 | struct fhstatus nfsv2; |
957 | struct mountres3 nfsv3; |
958 | } status; |
959 | int daemonized; |
960 | char *s; |
961 | int port; |
962 | int mountport; |
963 | int proto; |
964 | #if BB_MMU |
965 | smallint bg = 0; |
966 | #else |
967 | enum { bg = 0 }; |
968 | #endif |
969 | int retry; |
970 | int mountprog; |
971 | int mountvers; |
972 | int nfsprog; |
973 | int nfsvers; |
974 | int retval; |
975 | /* these all are one-bit really. 4.3.1 likes this combination: */ |
976 | smallint tcp; |
977 | smallint soft; |
978 | int intr; |
979 | int posix; |
980 | int nocto; |
981 | int noac; |
982 | int nordirplus; |
983 | int nolock; |
984 | |
985 | find_kernel_nfs_mount_version(); |
986 | |
987 | daemonized = 0; |
988 | mounthost = NULL; |
989 | retval = ETIMEDOUT; |
990 | msock = fsock = -1; |
991 | mclient = NULL; |
992 | |
993 | /* NB: hostname, mounthost, filteropts must be free()d prior to return */ |
994 | |
995 | filteropts = xstrdup(filteropts); /* going to trash it later... */ |
996 | |
997 | hostname = xstrdup(mp->mnt_fsname); |
998 | /* mount_main() guarantees that ':' is there */ |
999 | s = strchr(hostname, ':'); |
1000 | pathname = s + 1; |
1001 | *s = '\0'; |
1002 | /* Ignore all but first hostname in replicated mounts |
1003 | until they can be fully supported. (mack@sgi.com) */ |
1004 | s = strchr(hostname, ','); |
1005 | if (s) { |
1006 | *s = '\0'; |
1007 | bb_error_msg("warning: multiple hostnames not supported"); |
1008 | } |
1009 | |
1010 | server_addr.sin_family = AF_INET; |
1011 | if (!inet_aton(hostname, &server_addr.sin_addr)) { |
1012 | hp = gethostbyname(hostname); |
1013 | if (hp == NULL) { |
1014 | bb_herror_msg("%s", hostname); |
1015 | goto fail; |
1016 | } |
1017 | if ((size_t)hp->h_length > sizeof(struct in_addr)) { |
1018 | bb_error_msg("got bad hp->h_length"); |
1019 | hp->h_length = sizeof(struct in_addr); |
1020 | } |
1021 | memcpy(&server_addr.sin_addr, |
1022 | hp->h_addr, hp->h_length); |
1023 | } |
1024 | |
1025 | memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr)); |
1026 | |
1027 | /* add IP address to mtab options for use when unmounting */ |
1028 | |
1029 | if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */ |
1030 | mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr)); |
1031 | } else { |
1032 | char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts, |
1033 | mp->mnt_opts[0] ? "," : "", |
1034 | inet_ntoa(server_addr.sin_addr)); |
1035 | free(mp->mnt_opts); |
1036 | mp->mnt_opts = tmp; |
1037 | } |
1038 | |
1039 | /* Set default options. |
1040 | * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to |
1041 | * let the kernel decide. |
1042 | * timeo is filled in after we know whether it'll be TCP or UDP. */ |
1043 | memset(&data, 0, sizeof(data)); |
1044 | data.retrans = 3; |
1045 | data.acregmin = 3; |
1046 | data.acregmax = 60; |
1047 | data.acdirmin = 30; |
1048 | data.acdirmax = 60; |
1049 | data.namlen = NAME_MAX; |
1050 | |
1051 | soft = 0; |
1052 | intr = 0; |
1053 | posix = 0; |
1054 | nocto = 0; |
1055 | nolock = 0; |
1056 | noac = 0; |
1057 | nordirplus = 0; |
1058 | retry = 10000; /* 10000 minutes ~ 1 week */ |
1059 | tcp = 0; |
1060 | |
1061 | mountprog = MOUNTPROG; |
1062 | mountvers = 0; |
1063 | port = 0; |
1064 | mountport = 0; |
1065 | nfsprog = 100003; |
1066 | nfsvers = 0; |
1067 | |
1068 | /* parse options */ |
1069 | if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { |
1070 | char *opteq = strchr(opt, '='); |
1071 | if (opteq) { |
1072 | int val, idx; |
1073 | static const char options[] ALIGN1 = |
1074 | /* 0 */ "rsize\0" |
1075 | /* 1 */ "wsize\0" |
1076 | /* 2 */ "timeo\0" |
1077 | /* 3 */ "retrans\0" |
1078 | /* 4 */ "acregmin\0" |
1079 | /* 5 */ "acregmax\0" |
1080 | /* 6 */ "acdirmin\0" |
1081 | /* 7 */ "acdirmax\0" |
1082 | /* 8 */ "actimeo\0" |
1083 | /* 9 */ "retry\0" |
1084 | /* 10 */ "port\0" |
1085 | /* 11 */ "mountport\0" |
1086 | /* 12 */ "mounthost\0" |
1087 | /* 13 */ "mountprog\0" |
1088 | /* 14 */ "mountvers\0" |
1089 | /* 15 */ "nfsprog\0" |
1090 | /* 16 */ "nfsvers\0" |
1091 | /* 17 */ "vers\0" |
1092 | /* 18 */ "proto\0" |
1093 | /* 19 */ "namlen\0" |
1094 | /* 20 */ "addr\0"; |
1095 | |
1096 | *opteq++ = '\0'; |
1097 | idx = index_in_strings(options, opt); |
1098 | switch (idx) { |
1099 | case 12: // "mounthost" |
1100 | mounthost = xstrndup(opteq, |
1101 | strcspn(opteq, " \t\n\r,")); |
1102 | continue; |
1103 | case 18: // "proto" |
1104 | if (!strncmp(opteq, "tcp", 3)) |
1105 | tcp = 1; |
1106 | else if (!strncmp(opteq, "udp", 3)) |
1107 | tcp = 0; |
1108 | else |
1109 | bb_error_msg("warning: unrecognized proto= option"); |
1110 | continue; |
1111 | case 20: // "addr" - ignore |
1112 | continue; |
1113 | } |
1114 | |
1115 | val = xatoi_u(opteq); |
1116 | switch (idx) { |
1117 | case 0: // "rsize" |
1118 | data.rsize = val; |
1119 | continue; |
1120 | case 1: // "wsize" |
1121 | data.wsize = val; |
1122 | continue; |
1123 | case 2: // "timeo" |
1124 | data.timeo = val; |
1125 | continue; |
1126 | case 3: // "retrans" |
1127 | data.retrans = val; |
1128 | continue; |
1129 | case 4: // "acregmin" |
1130 | data.acregmin = val; |
1131 | continue; |
1132 | case 5: // "acregmax" |
1133 | data.acregmax = val; |
1134 | continue; |
1135 | case 6: // "acdirmin" |
1136 | data.acdirmin = val; |
1137 | continue; |
1138 | case 7: // "acdirmax" |
1139 | data.acdirmax = val; |
1140 | continue; |
1141 | case 8: // "actimeo" |
1142 | data.acregmin = val; |
1143 | data.acregmax = val; |
1144 | data.acdirmin = val; |
1145 | data.acdirmax = val; |
1146 | continue; |
1147 | case 9: // "retry" |
1148 | retry = val; |
1149 | continue; |
1150 | case 10: // "port" |
1151 | port = val; |
1152 | continue; |
1153 | case 11: // "mountport" |
1154 | mountport = val; |
1155 | continue; |
1156 | case 13: // "mountprog" |
1157 | mountprog = val; |
1158 | continue; |
1159 | case 14: // "mountvers" |
1160 | mountvers = val; |
1161 | continue; |
1162 | case 15: // "nfsprog" |
1163 | nfsprog = val; |
1164 | continue; |
1165 | case 16: // "nfsvers" |
1166 | case 17: // "vers" |
1167 | nfsvers = val; |
1168 | continue; |
1169 | case 19: // "namlen" |
1170 | //if (nfs_mount_version >= 2) |
1171 | data.namlen = val; |
1172 | //else |
1173 | // bb_error_msg("warning: option namlen is not supported\n"); |
1174 | continue; |
1175 | default: |
1176 | bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); |
1177 | goto fail; |
1178 | } |
1179 | } |
1180 | else { /* not of the form opt=val */ |
1181 | static const char options[] ALIGN1 = |
1182 | "bg\0" |
1183 | "fg\0" |
1184 | "soft\0" |
1185 | "hard\0" |
1186 | "intr\0" |
1187 | "posix\0" |
1188 | "cto\0" |
1189 | "ac\0" |
1190 | "tcp\0" |
1191 | "udp\0" |
1192 | "lock\0" |
1193 | "rdirplus\0"; |
1194 | int val = 1; |
1195 | if (!strncmp(opt, "no", 2)) { |
1196 | val = 0; |
1197 | opt += 2; |
1198 | } |
1199 | switch (index_in_strings(options, opt)) { |
1200 | case 0: // "bg" |
1201 | #if BB_MMU |
1202 | bg = val; |
1203 | #endif |
1204 | break; |
1205 | case 1: // "fg" |
1206 | #if BB_MMU |
1207 | bg = !val; |
1208 | #endif |
1209 | break; |
1210 | case 2: // "soft" |
1211 | soft = val; |
1212 | break; |
1213 | case 3: // "hard" |
1214 | soft = !val; |
1215 | break; |
1216 | case 4: // "intr" |
1217 | intr = val; |
1218 | break; |
1219 | case 5: // "posix" |
1220 | posix = val; |
1221 | break; |
1222 | case 6: // "cto" |
1223 | nocto = !val; |
1224 | break; |
1225 | case 7: // "ac" |
1226 | noac = !val; |
1227 | break; |
1228 | case 8: // "tcp" |
1229 | tcp = val; |
1230 | break; |
1231 | case 9: // "udp" |
1232 | tcp = !val; |
1233 | break; |
1234 | case 10: // "lock" |
1235 | if (nfs_mount_version >= 3) |
1236 | nolock = !val; |
1237 | else |
1238 | bb_error_msg("warning: option nolock is not supported"); |
1239 | break; |
1240 | case 11: //rdirplus |
1241 | nordirplus = !val; |
1242 | break; |
1243 | default: |
1244 | bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt); |
1245 | goto fail; |
1246 | } |
1247 | } |
1248 | } |
1249 | proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP; |
1250 | |
1251 | data.flags = (soft ? NFS_MOUNT_SOFT : 0) |
1252 | | (intr ? NFS_MOUNT_INTR : 0) |
1253 | | (posix ? NFS_MOUNT_POSIX : 0) |
1254 | | (nocto ? NFS_MOUNT_NOCTO : 0) |
1255 | | (noac ? NFS_MOUNT_NOAC : 0) |
1256 | | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0); |
1257 | if (nfs_mount_version >= 2) |
1258 | data.flags |= (tcp ? NFS_MOUNT_TCP : 0); |
1259 | if (nfs_mount_version >= 3) |
1260 | data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); |
1261 | if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) { |
1262 | bb_error_msg("NFSv%d not supported", nfsvers); |
1263 | goto fail; |
1264 | } |
1265 | if (nfsvers && !mountvers) |
1266 | mountvers = (nfsvers < 3) ? 1 : nfsvers; |
1267 | if (nfsvers && nfsvers < mountvers) { |
1268 | mountvers = nfsvers; |
1269 | } |
1270 | |
1271 | /* Adjust options if none specified */ |
1272 | if (!data.timeo) |
1273 | data.timeo = tcp ? 70 : 7; |
1274 | |
1275 | data.version = nfs_mount_version; |
1276 | |
1277 | if (vfsflags & MS_REMOUNT) |
1278 | goto do_mount; |
1279 | |
1280 | /* |
1281 | * If the previous mount operation on the same host was |
1282 | * backgrounded, and the "bg" for this mount is also set, |
1283 | * give up immediately, to avoid the initial timeout. |
1284 | */ |
1285 | if (bg && we_saw_this_host_before(hostname)) { |
1286 | daemonized = daemonize(); |
1287 | if (daemonized <= 0) { /* parent or error */ |
1288 | retval = -daemonized; |
1289 | goto ret; |
1290 | } |
1291 | } |
1292 | |
1293 | /* create mount daemon client */ |
1294 | /* See if the nfs host = mount host. */ |
1295 | if (mounthost) { |
1296 | if (mounthost[0] >= '0' && mounthost[0] <= '9') { |
1297 | mount_server_addr.sin_family = AF_INET; |
1298 | mount_server_addr.sin_addr.s_addr = inet_addr(hostname); |
1299 | } else { |
1300 | hp = gethostbyname(mounthost); |
1301 | if (hp == NULL) { |
1302 | bb_herror_msg("%s", mounthost); |
1303 | goto fail; |
1304 | } |
1305 | if ((size_t)hp->h_length > sizeof(struct in_addr)) { |
1306 | bb_error_msg("got bad hp->h_length"); |
1307 | hp->h_length = sizeof(struct in_addr); |
1308 | } |
1309 | mount_server_addr.sin_family = AF_INET; |
1310 | memcpy(&mount_server_addr.sin_addr, |
1311 | hp->h_addr, hp->h_length); |
1312 | } |
1313 | } |
1314 | |
1315 | /* |
1316 | * The following loop implements the mount retries. When the mount |
1317 | * times out, and the "bg" option is set, we background ourself |
1318 | * and continue trying. |
1319 | * |
1320 | * The case where the mount point is not present and the "bg" |
1321 | * option is set, is treated as a timeout. This is done to |
1322 | * support nested mounts. |
1323 | * |
1324 | * The "retry" count specified by the user is the number of |
1325 | * minutes to retry before giving up. |
1326 | */ |
1327 | { |
1328 | struct timeval total_timeout; |
1329 | struct timeval retry_timeout; |
1330 | struct pmap pm_mnt; |
1331 | time_t t; |
1332 | time_t prevt; |
1333 | time_t timeout; |
1334 | |
1335 | retry_timeout.tv_sec = 3; |
1336 | retry_timeout.tv_usec = 0; |
1337 | total_timeout.tv_sec = 20; |
1338 | total_timeout.tv_usec = 0; |
1339 | //FIXME: use monotonic()? |
1340 | timeout = time(NULL) + 60 * retry; |
1341 | prevt = 0; |
1342 | t = 30; |
1343 | retry: |
1344 | /* be careful not to use too many CPU cycles */ |
1345 | if (t - prevt < 30) |
1346 | sleep(30); |
1347 | |
1348 | get_mountport(&pm_mnt, &mount_server_addr, |
1349 | mountprog, |
1350 | mountvers, |
1351 | proto, |
1352 | mountport); |
1353 | nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers; |
1354 | |
1355 | /* contact the mount daemon via TCP */ |
1356 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
1357 | msock = RPC_ANYSOCK; |
1358 | |
1359 | switch (pm_mnt.pm_prot) { |
1360 | case IPPROTO_UDP: |
1361 | mclient = clntudp_create(&mount_server_addr, |
1362 | pm_mnt.pm_prog, |
1363 | pm_mnt.pm_vers, |
1364 | retry_timeout, |
1365 | &msock); |
1366 | if (mclient) |
1367 | break; |
1368 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
1369 | msock = RPC_ANYSOCK; |
1370 | case IPPROTO_TCP: |
1371 | mclient = clnttcp_create(&mount_server_addr, |
1372 | pm_mnt.pm_prog, |
1373 | pm_mnt.pm_vers, |
1374 | &msock, 0, 0); |
1375 | break; |
1376 | default: |
1377 | mclient = NULL; |
1378 | } |
1379 | if (!mclient) { |
1380 | if (!daemonized && prevt == 0) |
1381 | error_msg_rpc(clnt_spcreateerror(" ")); |
1382 | } else { |
1383 | enum clnt_stat clnt_stat; |
1384 | /* try to mount hostname:pathname */ |
1385 | mclient->cl_auth = authunix_create_default(); |
1386 | |
1387 | /* make pointers in xdr_mountres3 NULL so |
1388 | * that xdr_array allocates memory for us |
1389 | */ |
1390 | memset(&status, 0, sizeof(status)); |
1391 | |
1392 | if (pm_mnt.pm_vers == 3) |
1393 | clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, |
1394 | (xdrproc_t) xdr_dirpath, |
1395 | (caddr_t) &pathname, |
1396 | (xdrproc_t) xdr_mountres3, |
1397 | (caddr_t) &status, |
1398 | total_timeout); |
1399 | else |
1400 | clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, |
1401 | (xdrproc_t) xdr_dirpath, |
1402 | (caddr_t) &pathname, |
1403 | (xdrproc_t) xdr_fhstatus, |
1404 | (caddr_t) &status, |
1405 | total_timeout); |
1406 | |
1407 | if (clnt_stat == RPC_SUCCESS) |
1408 | goto prepare_kernel_data; /* we're done */ |
1409 | if (errno != ECONNREFUSED) { |
1410 | error_msg_rpc(clnt_sperror(mclient, " ")); |
1411 | goto fail; /* don't retry */ |
1412 | } |
1413 | /* Connection refused */ |
1414 | if (!daemonized && prevt == 0) /* print just once */ |
1415 | error_msg_rpc(clnt_sperror(mclient, " ")); |
1416 | auth_destroy(mclient->cl_auth); |
1417 | clnt_destroy(mclient); |
1418 | mclient = NULL; |
1419 | close(msock); |
1420 | msock = -1; |
1421 | } |
1422 | |
1423 | /* Timeout. We are going to retry... maybe */ |
1424 | |
1425 | if (!bg) |
1426 | goto fail; |
1427 | if (!daemonized) { |
1428 | daemonized = daemonize(); |
1429 | if (daemonized <= 0) { /* parent or error */ |
1430 | retval = -daemonized; |
1431 | goto ret; |
1432 | } |
1433 | } |
1434 | prevt = t; |
1435 | t = time(NULL); |
1436 | if (t >= timeout) |
1437 | /* TODO error message */ |
1438 | goto fail; |
1439 | |
1440 | goto retry; |
1441 | } |
1442 | |
1443 | prepare_kernel_data: |
1444 | |
1445 | if (nfsvers == 2) { |
1446 | if (status.nfsv2.fhs_status != 0) { |
1447 | bb_error_msg("%s:%s failed, reason given by server: %s", |
1448 | hostname, pathname, |
1449 | nfs_strerror(status.nfsv2.fhs_status)); |
1450 | goto fail; |
1451 | } |
1452 | memcpy(data.root.data, |
1453 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
1454 | NFS_FHSIZE); |
1455 | data.root.size = NFS_FHSIZE; |
1456 | memcpy(data.old_root.data, |
1457 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
1458 | NFS_FHSIZE); |
1459 | } else { |
1460 | fhandle3 *my_fhandle; |
1461 | if (status.nfsv3.fhs_status != 0) { |
1462 | bb_error_msg("%s:%s failed, reason given by server: %s", |
1463 | hostname, pathname, |
1464 | nfs_strerror(status.nfsv3.fhs_status)); |
1465 | goto fail; |
1466 | } |
1467 | my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; |
1468 | memset(data.old_root.data, 0, NFS_FHSIZE); |
1469 | memset(&data.root, 0, sizeof(data.root)); |
1470 | data.root.size = my_fhandle->fhandle3_len; |
1471 | memcpy(data.root.data, |
1472 | (char *) my_fhandle->fhandle3_val, |
1473 | my_fhandle->fhandle3_len); |
1474 | |
1475 | data.flags |= NFS_MOUNT_VER3; |
1476 | } |
1477 | |
1478 | /* create nfs socket for kernel */ |
1479 | |
1480 | if (tcp) { |
1481 | if (nfs_mount_version < 3) { |
1482 | bb_error_msg("NFS over TCP is not supported"); |
1483 | goto fail; |
1484 | } |
1485 | fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
1486 | } else |
1487 | fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1488 | if (fsock < 0) { |
1489 | bb_perror_msg("nfs socket"); |
1490 | goto fail; |
1491 | } |
1492 | if (bindresvport(fsock, 0) < 0) { |
1493 | bb_perror_msg("nfs bindresvport"); |
1494 | goto fail; |
1495 | } |
1496 | if (port == 0) { |
1497 | server_addr.sin_port = PMAPPORT; |
1498 | port = pmap_getport(&server_addr, nfsprog, nfsvers, |
1499 | tcp ? IPPROTO_TCP : IPPROTO_UDP); |
1500 | if (port == 0) |
1501 | port = NFS_PORT; |
1502 | } |
1503 | server_addr.sin_port = htons(port); |
1504 | |
1505 | /* prepare data structure for kernel */ |
1506 | |
1507 | data.fd = fsock; |
1508 | memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); |
1509 | strncpy(data.hostname, hostname, sizeof(data.hostname)); |
1510 | |
1511 | /* clean up */ |
1512 | |
1513 | auth_destroy(mclient->cl_auth); |
1514 | clnt_destroy(mclient); |
1515 | close(msock); |
1516 | msock = -1; |
1517 | |
1518 | if (bg) { |
1519 | /* We must wait until mount directory is available */ |
1520 | struct stat statbuf; |
1521 | int delay = 1; |
1522 | while (stat(mp->mnt_dir, &statbuf) == -1) { |
1523 | if (!daemonized) { |
1524 | daemonized = daemonize(); |
1525 | if (daemonized <= 0) { /* parent or error */ |
1526 | // FIXME: parent doesn't close fsock - ??! |
1527 | retval = -daemonized; |
1528 | goto ret; |
1529 | } |
1530 | } |
1531 | sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */ |
1532 | delay *= 2; |
1533 | if (delay > 30) |
1534 | delay = 30; |
1535 | } |
1536 | } |
1537 | |
1538 | do_mount: /* perform actual mount */ |
1539 | |
1540 | mp->mnt_type = (char*)"nfs"; |
1541 | retval = mount_it_now(mp, vfsflags, (char*)&data); |
1542 | goto ret; |
1543 | |
1544 | fail: /* abort */ |
1545 | |
1546 | if (msock >= 0) { |
1547 | if (mclient) { |
1548 | auth_destroy(mclient->cl_auth); |
1549 | clnt_destroy(mclient); |
1550 | } |
1551 | close(msock); |
1552 | } |
1553 | if (fsock >= 0) |
1554 | close(fsock); |
1555 | |
1556 | ret: |
1557 | free(hostname); |
1558 | free(mounthost); |
1559 | free(filteropts); |
1560 | return retval; |
1561 | } |
1562 | |
1563 | #else /* !ENABLE_FEATURE_MOUNT_NFS */ |
1564 | |
1565 | /* Never called. Call should be optimized out. */ |
1566 | int nfsmount(struct mntent *mp, long vfsflags, char *filteropts); |
1567 | |
1568 | #endif /* !ENABLE_FEATURE_MOUNT_NFS */ |
1569 | |
1570 | // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem |
1571 | // type detection. Returns 0 for success, nonzero for failure. |
1572 | // NB: mp->xxx fields may be trashed on exit |
1573 | static int singlemount(struct mntent *mp, int ignore_busy) |
1574 | { |
1575 | int rc = -1; |
1576 | long vfsflags; |
1577 | char *loopFile = 0, *filteropts = 0; |
1578 | llist_t *fl = 0; |
1579 | struct stat st; |
1580 | |
1581 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); |
1582 | |
1583 | // Treat fstype "auto" as unspecified. |
1584 | |
1585 | if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0) |
1586 | mp->mnt_type = NULL; |
1587 | |
1588 | // Might this be a virtual filesystem? |
1589 | |
1590 | if (ENABLE_FEATURE_MOUNT_HELPERS |
1591 | && (strchr(mp->mnt_fsname, '#')) |
1592 | ) { |
1593 | char *s, *p, *args[35]; |
1594 | int n = 0; |
1595 | // FIXME: does it allow execution of arbitrary commands?! |
1596 | // What args[0] can end up with? |
1597 | for (s = p = mp->mnt_fsname; *s && n < 35-3; ++s) { |
1598 | if (s[0] == '#' && s[1] != '#') { |
1599 | *s = '\0'; |
1600 | args[n++] = p; |
1601 | p = s + 1; |
1602 | } |
1603 | } |
1604 | args[n++] = p; |
1605 | args[n++] = mp->mnt_dir; |
1606 | args[n] = NULL; |
1607 | rc = wait4pid(xspawn(args)); |
1608 | goto report_error; |
1609 | } |
1610 | |
1611 | // Might this be an CIFS filesystem? |
1612 | |
1613 | if (ENABLE_FEATURE_MOUNT_CIFS |
1614 | && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0) |
1615 | && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\') |
1616 | && mp->mnt_fsname[0] == mp->mnt_fsname[1] |
1617 | ) { |
1618 | len_and_sockaddr *lsa; |
1619 | char *ip, *dotted; |
1620 | char *s; |
1621 | |
1622 | rc = 1; |
1623 | // Replace '/' with '\' and verify that unc points to "//server/share". |
1624 | |
1625 | for (s = mp->mnt_fsname; *s; ++s) |
1626 | if (*s == '/') *s = '\\'; |
1627 | |
1628 | // get server IP |
1629 | |
1630 | s = strrchr(mp->mnt_fsname, '\\'); |
1631 | if (s <= mp->mnt_fsname+1) goto report_error; |
1632 | *s = '\0'; |
1633 | lsa = host2sockaddr(mp->mnt_fsname+2, 0); |
1634 | *s = '\\'; |
1635 | if (!lsa) goto report_error; |
1636 | |
1637 | // insert ip=... option into string flags. |
1638 | |
1639 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
1640 | ip = xasprintf("ip=%s", dotted); |
1641 | parse_mount_options(ip, &filteropts); |
1642 | |
1643 | // compose new unc '\\server-ip\share' |
1644 | // (s => slash after hostname) |
1645 | |
1646 | mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s); |
1647 | |
1648 | // lock is required |
1649 | vfsflags |= MS_MANDLOCK; |
1650 | |
1651 | mp->mnt_type = (char*)"cifs"; |
1652 | rc = mount_it_now(mp, vfsflags, filteropts); |
1653 | if (ENABLE_FEATURE_CLEAN_UP) { |
1654 | free(mp->mnt_fsname); |
1655 | free(ip); |
1656 | free(dotted); |
1657 | free(lsa); |
1658 | } |
1659 | goto report_error; |
1660 | } |
1661 | |
1662 | // Might this be an NFS filesystem? |
1663 | |
1664 | if (ENABLE_FEATURE_MOUNT_NFS |
1665 | && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs")) |
1666 | && strchr(mp->mnt_fsname, ':') != NULL |
1667 | ) { |
1668 | rc = nfsmount(mp, vfsflags, filteropts); |
1669 | goto report_error; |
1670 | } |
1671 | |
1672 | // Look at the file. (Not found isn't a failure for remount, or for |
1673 | // a synthetic filesystem like proc or sysfs.) |
1674 | // (We use stat, not lstat, in order to allow |
1675 | // mount symlink_to_file_or_blkdev dir) |
1676 | |
1677 | if (!stat(mp->mnt_fsname, &st) |
1678 | && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)) |
1679 | ) { |
1680 | // Do we need to allocate a loopback device for it? |
1681 | |
1682 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { |
1683 | loopFile = bb_simplify_path(mp->mnt_fsname); |
1684 | mp->mnt_fsname = NULL; /* will receive malloced loop dev name */ |
1685 | if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) { |
1686 | if (errno == EPERM || errno == EACCES) |
1687 | bb_error_msg(bb_msg_perm_denied_are_you_root); |
1688 | else |
1689 | bb_perror_msg("cannot setup loop device"); |
1690 | return errno; |
1691 | } |
1692 | |
1693 | // Autodetect bind mounts |
1694 | |
1695 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) |
1696 | vfsflags |= MS_BIND; |
1697 | } |
1698 | |
1699 | /* If we know the fstype (or don't need to), jump straight |
1700 | * to the actual mount. */ |
1701 | |
1702 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) |
1703 | rc = mount_it_now(mp, vfsflags, filteropts); |
1704 | else { |
1705 | // Loop through filesystem types until mount succeeds |
1706 | // or we run out |
1707 | |
1708 | /* Initialize list of block backed filesystems. This has to be |
1709 | * done here so that during "mount -a", mounts after /proc shows up |
1710 | * can autodetect. */ |
1711 | |
1712 | if (!fslist) { |
1713 | fslist = get_block_backed_filesystems(); |
1714 | if (ENABLE_FEATURE_CLEAN_UP && fslist) |
1715 | atexit(delete_block_backed_filesystems); |
1716 | } |
1717 | |
1718 | for (fl = fslist; fl; fl = fl->link) { |
1719 | mp->mnt_type = fl->data; |
1720 | rc = mount_it_now(mp, vfsflags, filteropts); |
1721 | if (!rc) break; |
1722 | } |
1723 | } |
1724 | |
1725 | // If mount failed, clean up loop file (if any). |
1726 | |
1727 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { |
1728 | del_loop(mp->mnt_fsname); |
1729 | if (ENABLE_FEATURE_CLEAN_UP) { |
1730 | free(loopFile); |
1731 | free(mp->mnt_fsname); |
1732 | } |
1733 | } |
1734 | |
1735 | report_error: |
1736 | if (ENABLE_FEATURE_CLEAN_UP) |
1737 | free(filteropts); |
1738 | |
1739 | if (errno == EBUSY && ignore_busy) |
1740 | return 0; |
1741 | if (rc < 0) |
1742 | bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); |
1743 | return rc; |
1744 | } |
1745 | |
1746 | // Parse options, if necessary parse fstab/mtab, and call singlemount for |
1747 | // each directory to be mounted. |
1748 | |
1749 | static const char must_be_root[] ALIGN1 = "you must be root"; |
1750 | |
1751 | int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
1752 | int mount_main(int argc UNUSED_PARAM, char **argv) |
1753 | { |
1754 | char *cmdopts = xstrdup(""); |
1755 | char *fstype = NULL; |
1756 | char *storage_path; |
1757 | llist_t *lst_o = NULL; |
1758 | const char *fstabname; |
1759 | FILE *fstab; |
1760 | int i, j, rc = 0; |
1761 | unsigned opt; |
1762 | struct mntent mtpair[2], *mtcur = mtpair; |
1763 | SKIP_DESKTOP(const int nonroot = 0;) |
1764 | |
1765 | USE_DESKTOP(int nonroot = ) sanitize_env_if_suid(); |
1766 | |
1767 | // Parse long options, like --bind and --move. Note that -o option |
1768 | // and --option are synonymous. Yes, this means --remount,rw works. |
1769 | for (i = j = 1; argv[i]; i++) { |
1770 | if (argv[i][0] == '-' && argv[i][1] == '-') |
1771 | append_mount_options(&cmdopts, argv[i] + 2); |
1772 | else |
1773 | argv[j++] = argv[i]; |
1774 | } |
1775 | argv[j] = NULL; |
1776 | |
1777 | // Parse remaining options |
1778 | // Max 2 params; -v is a counter |
1779 | opt_complementary = "?2o::" USE_FEATURE_MOUNT_VERBOSE(":vv"); |
1780 | opt = getopt32(argv, OPTION_STR, &lst_o, &fstype |
1781 | USE_FEATURE_MOUNT_VERBOSE(, &verbose)); |
1782 | while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o |
1783 | if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r |
1784 | if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w |
1785 | argv += optind; |
1786 | |
1787 | // If we have no arguments, show currently mounted filesystems |
1788 | if (!argv[0]) { |
1789 | if (!(opt & OPT_a)) { |
1790 | FILE *mountTable = setmntent(bb_path_mtab_file, "r"); |
1791 | |
1792 | if (!mountTable) |
1793 | bb_error_msg_and_die("no %s", bb_path_mtab_file); |
1794 | |
1795 | while (getmntent_r(mountTable, &mtpair[0], getmntent_buf, |
1796 | GETMNTENT_BUFSIZE)) |
1797 | { |
1798 | // Don't show rootfs. FIXME: why?? |
1799 | // util-linux 2.12a happily shows rootfs... |
1800 | //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue; |
1801 | |
1802 | if (!fstype || !strcmp(mtpair->mnt_type, fstype)) |
1803 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname, |
1804 | mtpair->mnt_dir, mtpair->mnt_type, |
1805 | mtpair->mnt_opts); |
1806 | } |
1807 | if (ENABLE_FEATURE_CLEAN_UP) |
1808 | endmntent(mountTable); |
1809 | return EXIT_SUCCESS; |
1810 | } |
1811 | storage_path = NULL; |
1812 | } else { |
1813 | // When we have two arguments, the second is the directory and we can |
1814 | // skip looking at fstab entirely. We can always abspath() the directory |
1815 | // argument when we get it. |
1816 | if (argv[1]) { |
1817 | if (nonroot) |
1818 | bb_error_msg_and_die(must_be_root); |
1819 | mtpair->mnt_fsname = argv[0]; |
1820 | mtpair->mnt_dir = argv[1]; |
1821 | mtpair->mnt_type = fstype; |
1822 | mtpair->mnt_opts = cmdopts; |
1823 | if (ENABLE_FEATURE_MOUNT_LABEL) { |
1824 | resolve_mount_spec(&mtpair->mnt_fsname); |
1825 | } |
1826 | rc = singlemount(mtpair, 0); |
1827 | return rc; |
1828 | } |
1829 | storage_path = bb_simplify_path(argv[0]); // malloced |
1830 | } |
1831 | |
1832 | // Past this point, we are handling either "mount -a [opts]" |
1833 | // or "mount [opts] single_param" |
1834 | |
1835 | i = parse_mount_options(cmdopts, 0); // FIXME: should be "long", not "int" |
1836 | if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags |
1837 | bb_error_msg_and_die(must_be_root); |
1838 | |
1839 | // If we have a shared subtree flag, don't worry about fstab or mtab. |
1840 | if (ENABLE_FEATURE_MOUNT_FLAGS |
1841 | && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)) |
1842 | ) { |
1843 | rc = verbose_mount(/*source:*/ "", /*target:*/ argv[0], |
1844 | /*type:*/ "", /*flags:*/ i, /*data:*/ ""); |
1845 | if (rc) |
1846 | bb_simple_perror_msg_and_die(argv[0]); |
1847 | return rc; |
1848 | } |
1849 | |
1850 | // Open either fstab or mtab |
1851 | fstabname = "/etc/fstab"; |
1852 | if (i & MS_REMOUNT) { |
1853 | // WARNING. I am not sure this matches util-linux's |
1854 | // behavior. It's possible util-linux does not |
1855 | // take -o opts from mtab (takes only mount source). |
1856 | fstabname = bb_path_mtab_file; |
1857 | } |
1858 | fstab = setmntent(fstabname, "r"); |
1859 | if (!fstab) |
1860 | bb_perror_msg_and_die("cannot read %s", fstabname); |
1861 | |
1862 | // Loop through entries until we find what we're looking for |
1863 | memset(mtpair, 0, sizeof(mtpair)); |
1864 | for (;;) { |
1865 | struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair); |
1866 | |
1867 | // Get next fstab entry |
1868 | if (!getmntent_r(fstab, mtcur, getmntent_buf |
1869 | + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0), |
1870 | GETMNTENT_BUFSIZE/2) |
1871 | ) { // End of fstab/mtab is reached |
1872 | mtcur = mtother; // the thing we found last time |
1873 | break; |
1874 | } |
1875 | |
1876 | // If we're trying to mount something specific and this isn't it, |
1877 | // skip it. Note we must match the exact text in fstab (ala |
1878 | // "proc") or a full path from root |
1879 | if (argv[0]) { |
1880 | |
1881 | // Is this what we're looking for? |
1882 | if (strcmp(argv[0], mtcur->mnt_fsname) && |
1883 | strcmp(storage_path, mtcur->mnt_fsname) && |
1884 | strcmp(argv[0], mtcur->mnt_dir) && |
1885 | strcmp(storage_path, mtcur->mnt_dir)) continue; |
1886 | |
1887 | // Remember this entry. Something later may have |
1888 | // overmounted it, and we want the _last_ match. |
1889 | mtcur = mtother; |
1890 | |
1891 | // If we're mounting all |
1892 | } else { |
1893 | // Do we need to match a filesystem type? |
1894 | if (fstype && match_fstype(mtcur, fstype)) |
1895 | continue; |
1896 | |
1897 | // Skip noauto and swap anyway. |
1898 | if (parse_mount_options(mtcur->mnt_opts, 0) & (MOUNT_NOAUTO | MOUNT_SWAP)) |
1899 | continue; |
1900 | |
1901 | // No, mount -a won't mount anything, |
1902 | // even user mounts, for mere humans |
1903 | if (nonroot) |
1904 | bb_error_msg_and_die(must_be_root); |
1905 | |
1906 | // Mount this thing |
1907 | if (ENABLE_FEATURE_MOUNT_LABEL) |
1908 | resolve_mount_spec(&mtpair->mnt_fsname); |
1909 | |
1910 | // NFS mounts want this to be xrealloc-able |
1911 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
1912 | if (singlemount(mtcur, 1)) { |
1913 | // Count number of failed mounts |
1914 | rc++; |
1915 | } |
1916 | free(mtcur->mnt_opts); |
1917 | } |
1918 | } |
1919 | |
1920 | // End of fstab/mtab is reached. |
1921 | // Were we looking for something specific? |
1922 | if (argv[0]) { |
1923 | // If we didn't find anything, complain |
1924 | if (!mtcur->mnt_fsname) |
1925 | bb_error_msg_and_die("can't find %s in %s", |
1926 | argv[0], fstabname); |
1927 | if (nonroot) { |
1928 | // fstab must have "users" or "user" |
1929 | if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS)) |
1930 | bb_error_msg_and_die(must_be_root); |
1931 | } |
1932 | |
1933 | // Mount the last thing we found |
1934 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
1935 | append_mount_options(&(mtcur->mnt_opts), cmdopts); |
1936 | if (ENABLE_FEATURE_MOUNT_LABEL) { |
1937 | resolve_mount_spec(&mtpair->mnt_fsname); |
1938 | } |
1939 | rc = singlemount(mtcur, 0); |
1940 | if (ENABLE_FEATURE_CLEAN_UP) |
1941 | free(mtcur->mnt_opts); |
1942 | } |
1943 | |
1944 | if (ENABLE_FEATURE_CLEAN_UP) |
1945 | endmntent(fstab); |
1946 | if (ENABLE_FEATURE_CLEAN_UP) { |
1947 | free(storage_path); |
1948 | free(cmdopts); |
1949 | } |
1950 | return rc; |
1951 | } |