Annotation of /tags/mkinitrd-6_1_12/busybox/util-linux/mount.c
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Tue Nov 17 21:24:51 2009 UTC (14 years, 7 months ago) by niro
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Tue Nov 17 21:24:51 2009 UTC (14 years, 7 months ago) by niro
File MIME type: text/plain
File size: 47905 byte(s)
tagged 'mkinitrd-6_1_12'
1 | niro | 532 | /* 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 | niro | 816 | #include <syslog.h> |
23 | #include "libbb.h" | ||
24 | niro | 532 | |
25 | niro | 816 | #if ENABLE_FEATURE_MOUNT_LABEL |
26 | #include "volume_id.h" | ||
27 | #endif | ||
28 | |||
29 | /* Needed for nfs support only */ | ||
30 | niro | 532 | #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 | niro | 816 | #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 | niro | 532 | |
45 | niro | 816 | |
46 | niro | 532 | #if defined(__dietlibc__) |
47 | /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi) | ||
48 | * dietlibc-0.30 does not have implementation of getmntent_r() */ | ||
49 | niro | 816 | static struct mntent *getmntent_r(FILE* stream, struct mntent* result, |
50 | char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM) | ||
51 | niro | 532 | { |
52 | struct mntent* ment = getmntent(stream); | ||
53 | niro | 816 | return memcpy(result, ment, sizeof(*ment)); |
54 | niro | 532 | } |
55 | #endif | ||
56 | |||
57 | |||
58 | // Not real flags, but we want to be able to check for this. | ||
59 | enum { | ||
60 | niro | 816 | MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP, |
61 | MOUNT_NOAUTO = (1 << 29), | ||
62 | MOUNT_SWAP = (1 << 30), | ||
63 | niro | 532 | }; |
64 | niro | 816 | |
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 | niro | 532 | // 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 | niro | 816 | static const int32_t mount_options[] = { |
106 | niro | 532 | // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. |
107 | |||
108 | USE_FEATURE_MOUNT_LOOP( | ||
109 | niro | 816 | /* "loop" */ 0, |
110 | niro | 532 | ) |
111 | |||
112 | USE_FEATURE_MOUNT_FSTAB( | ||
113 | niro | 816 | /* "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 | niro | 532 | ) |
122 | |||
123 | USE_FEATURE_MOUNT_FLAGS( | ||
124 | // vfs flags | ||
125 | niro | 816 | /* "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 | niro | 532 | |
144 | // action flags | ||
145 | niro | 816 | /* "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 | niro | 532 | |
157 | niro | 816 | // 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 | niro | 532 | ) |
167 | niro | 816 | 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 | niro | 532 | |
198 | niro | 816 | // 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 | niro | 532 | // Always understood. |
212 | niro | 816 | "ro" "\0" // vfs flag |
213 | "rw" "\0" // vfs flag | ||
214 | "remount" "\0" // action flag | ||
215 | ; | ||
216 | niro | 532 | |
217 | niro | 816 | |
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 | niro | 532 | }; |
229 | niro | 816 | 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 | niro | 532 | |
240 | |||
241 | niro | 816 | #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 | niro | 532 | /* Append mount options to string */ |
279 | niro | 816 | static void append_mount_options(char **oldopts, const char *newopts) |
280 | niro | 532 | { |
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 | niro | 816 | && (p[len] == ',' || p[len] == '\0')) |
292 | niro | 532 | goto skip; |
293 | p = strchr(p,','); | ||
294 | niro | 816 | if (!p) break; |
295 | niro | 532 | p++; |
296 | } | ||
297 | p = xasprintf("%s,%.*s", *oldopts, len, newopts); | ||
298 | free(*oldopts); | ||
299 | *oldopts = p; | ||
300 | niro | 816 | skip: |
301 | niro | 532 | 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 | niro | 816 | static long parse_mount_options(char *options, char **unrecognized) |
313 | niro | 532 | { |
314 | niro | 816 | long flags = MS_SILENT; |
315 | niro | 532 | |
316 | // Loop through options | ||
317 | for (;;) { | ||
318 | niro | 816 | unsigned i; |
319 | niro | 532 | char *comma = strchr(options, ','); |
320 | niro | 816 | const char *option_str = mount_option_str; |
321 | niro | 532 | |
322 | niro | 816 | if (comma) *comma = '\0'; |
323 | niro | 532 | |
324 | niro | 816 | /* FIXME: use hasmntopt() */ |
325 | niro | 532 | // Find this option in mount_options |
326 | niro | 816 | for (i = 0; i < ARRAY_SIZE(mount_options); i++) { |
327 | if (!strcasecmp(option_str, options)) { | ||
328 | long fl = mount_options[i]; | ||
329 | niro | 532 | if (fl < 0) flags &= fl; |
330 | else flags |= fl; | ||
331 | break; | ||
332 | } | ||
333 | niro | 816 | option_str += strlen(option_str) + 1; |
334 | niro | 532 | } |
335 | // If unrecognized not NULL, append unrecognized mount options */ | ||
336 | niro | 816 | if (unrecognized && i == ARRAY_SIZE(mount_options)) { |
337 | niro | 532 | // Add it to strflags, to pass on to kernel |
338 | i = *unrecognized ? strlen(*unrecognized) : 0; | ||
339 | niro | 816 | *unrecognized = xrealloc(*unrecognized, i + strlen(options) + 2); |
340 | niro | 532 | |
341 | // Comma separated if it's not the first one | ||
342 | if (i) (*unrecognized)[i++] = ','; | ||
343 | strcpy((*unrecognized)+i, options); | ||
344 | } | ||
345 | |||
346 | niro | 816 | if (!comma) |
347 | break; | ||
348 | // Advance to next option | ||
349 | *comma = ','; | ||
350 | options = ++comma; | ||
351 | niro | 532 | } |
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 | niro | 816 | static const char filesystems[2][sizeof("/proc/filesystems")] = { |
361 | niro | 532 | "/etc/filesystems", |
362 | "/proc/filesystems", | ||
363 | }; | ||
364 | char *fs, *buf; | ||
365 | llist_t *list = 0; | ||
366 | int i; | ||
367 | FILE *f; | ||
368 | |||
369 | niro | 816 | for (i = 0; i < 2; i++) { |
370 | f = fopen_for_read(filesystems[i]); | ||
371 | niro | 532 | if (!f) continue; |
372 | |||
373 | niro | 816 | while ((buf = xmalloc_fgetline(f)) != NULL) { |
374 | niro | 532 | 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 | niro | 816 | static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts) |
400 | niro | 532 | { |
401 | int rc = 0; | ||
402 | |||
403 | niro | 816 | 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 | niro | 532 | |
411 | // Mount, with fallback to read-only if necessary. | ||
412 | for (;;) { | ||
413 | niro | 816 | errno = 0; |
414 | rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, | ||
415 | niro | 532 | vfsflags, filteropts); |
416 | niro | 816 | |
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 | niro | 532 | break; |
440 | niro | 816 | if (!(vfsflags & MS_SILENT)) |
441 | bb_error_msg("%s is write-protected, mounting read-only", | ||
442 | mp->mnt_fsname); | ||
443 | niro | 532 | 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 | niro | 816 | if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) { |
455 | niro | 532 | char *fsname; |
456 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); | ||
457 | niro | 816 | const char *option_str = mount_option_str; |
458 | niro | 532 | int i; |
459 | |||
460 | if (!mountTable) { | ||
461 | niro | 816 | bb_error_msg("no %s", bb_path_mtab_file); |
462 | niro | 532 | goto ret; |
463 | } | ||
464 | |||
465 | // Add vfs string flags | ||
466 | |||
467 | niro | 816 | 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 | niro | 532 | |
473 | // Remove trailing / (if any) from directory we mounted on | ||
474 | |||
475 | i = strlen(mp->mnt_dir) - 1; | ||
476 | niro | 816 | if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0'; |
477 | niro | 532 | |
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 | niro | 816 | mp->mnt_type = (char*)"bind"; |
485 | niro | 532 | } |
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 | niro | 816 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org> |
519 | niro | 532 | * - 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 | niro | 816 | NFS_MOUNT_NONLM = 0x0200, /* 3 */ |
709 | NFS_MOUNT_NORDIRPLUS = 0x4000 | ||
710 | niro | 532 | }; |
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 | niro | 816 | short stat; |
730 | short errnum; | ||
731 | niro | 532 | } 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 | niro | 816 | return xasprintf("unknown nfs status return value: %d", status); |
747 | niro | 532 | } |
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 | niro | 816 | int kernel_version; |
834 | |||
835 | if (nfs_mount_version) | ||
836 | niro | 532 | 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 | niro | 816 | static void |
853 | get_mountport(struct pmap *pm_mnt, | ||
854 | struct sockaddr_in *server_addr, | ||
855 | niro | 532 | 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 | niro | 816 | /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *). |
864 | * I understand it like "IPv6 for this is not 100% ready" */ | ||
865 | niro | 532 | pmap = pmap_getmaps(server_addr); |
866 | |||
867 | if (version > MAX_NFSPROT) | ||
868 | version = MAX_NFSPROT; | ||
869 | if (!prog) | ||
870 | prog = MOUNTPROG; | ||
871 | niro | 816 | pm_mnt->pm_prog = prog; |
872 | pm_mnt->pm_vers = version; | ||
873 | pm_mnt->pm_prot = proto; | ||
874 | pm_mnt->pm_port = port; | ||
875 | niro | 532 | |
876 | while (pmap) { | ||
877 | if (pmap->pml_map.pm_prog != prog) | ||
878 | goto next; | ||
879 | niro | 816 | if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers) |
880 | niro | 532 | 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 | niro | 816 | (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) || |
887 | niro | 532 | (port && pmap->pml_map.pm_port != port)) |
888 | goto next; | ||
889 | niro | 816 | memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt)); |
890 | next: | ||
891 | niro | 532 | pmap = pmap->pml_next; |
892 | } | ||
893 | niro | 816 | 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 | niro | 532 | } |
900 | |||
901 | niro | 816 | #if BB_MMU |
902 | niro | 532 | 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 | niro | 816 | close(0); |
911 | xopen(bb_dev_null, O_RDWR); | ||
912 | xdup2(0, 1); | ||
913 | xdup2(0, 2); | ||
914 | niro | 532 | setsid(); |
915 | openlog(applet_name, LOG_PID, LOG_DAEMON); | ||
916 | logmode = LOGMODE_SYSLOG; | ||
917 | return 1; | ||
918 | } | ||
919 | niro | 816 | #else |
920 | static inline int daemonize(void) { return -ENOSYS; } | ||
921 | #endif | ||
922 | niro | 532 | |
923 | // TODO | ||
924 | niro | 816 | static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM) |
925 | niro | 532 | { |
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 | niro | 816 | static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) |
944 | niro | 532 | { |
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 | niro | 816 | #if BB_MMU |
965 | smallint bg = 0; | ||
966 | #else | ||
967 | enum { bg = 0 }; | ||
968 | #endif | ||
969 | niro | 532 | int retry; |
970 | int mountprog; | ||
971 | int mountvers; | ||
972 | int nfsprog; | ||
973 | int nfsvers; | ||
974 | int retval; | ||
975 | niro | 816 | /* 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 | niro | 532 | |
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 | niro | 816 | if ((size_t)hp->h_length > sizeof(struct in_addr)) { |
1018 | niro | 532 | 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 | niro | 816 | 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 | niro | 532 | |
1051 | soft = 0; | ||
1052 | intr = 0; | ||
1053 | posix = 0; | ||
1054 | nocto = 0; | ||
1055 | nolock = 0; | ||
1056 | noac = 0; | ||
1057 | niro | 816 | nordirplus = 0; |
1058 | niro | 532 | 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 | niro | 816 | if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { |
1070 | niro | 532 | char *opteq = strchr(opt, '='); |
1071 | if (opteq) { | ||
1072 | niro | 816 | 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 | niro | 532 | case 0: // "rsize" |
1118 | data.rsize = val; | ||
1119 | niro | 816 | continue; |
1120 | niro | 532 | case 1: // "wsize" |
1121 | data.wsize = val; | ||
1122 | niro | 816 | continue; |
1123 | niro | 532 | case 2: // "timeo" |
1124 | data.timeo = val; | ||
1125 | niro | 816 | continue; |
1126 | niro | 532 | case 3: // "retrans" |
1127 | data.retrans = val; | ||
1128 | niro | 816 | continue; |
1129 | niro | 532 | case 4: // "acregmin" |
1130 | data.acregmin = val; | ||
1131 | niro | 816 | continue; |
1132 | niro | 532 | case 5: // "acregmax" |
1133 | data.acregmax = val; | ||
1134 | niro | 816 | continue; |
1135 | niro | 532 | case 6: // "acdirmin" |
1136 | data.acdirmin = val; | ||
1137 | niro | 816 | continue; |
1138 | niro | 532 | case 7: // "acdirmax" |
1139 | data.acdirmax = val; | ||
1140 | niro | 816 | continue; |
1141 | niro | 532 | case 8: // "actimeo" |
1142 | data.acregmin = val; | ||
1143 | data.acregmax = val; | ||
1144 | data.acdirmin = val; | ||
1145 | data.acdirmax = val; | ||
1146 | niro | 816 | continue; |
1147 | niro | 532 | case 9: // "retry" |
1148 | retry = val; | ||
1149 | niro | 816 | continue; |
1150 | niro | 532 | case 10: // "port" |
1151 | port = val; | ||
1152 | niro | 816 | continue; |
1153 | niro | 532 | case 11: // "mountport" |
1154 | mountport = val; | ||
1155 | niro | 816 | continue; |
1156 | niro | 532 | case 13: // "mountprog" |
1157 | mountprog = val; | ||
1158 | niro | 816 | continue; |
1159 | niro | 532 | case 14: // "mountvers" |
1160 | mountvers = val; | ||
1161 | niro | 816 | continue; |
1162 | niro | 532 | case 15: // "nfsprog" |
1163 | nfsprog = val; | ||
1164 | niro | 816 | continue; |
1165 | niro | 532 | case 16: // "nfsvers" |
1166 | case 17: // "vers" | ||
1167 | nfsvers = val; | ||
1168 | niro | 816 | continue; |
1169 | niro | 532 | case 19: // "namlen" |
1170 | niro | 816 | //if (nfs_mount_version >= 2) |
1171 | niro | 532 | data.namlen = val; |
1172 | niro | 816 | //else |
1173 | // bb_error_msg("warning: option namlen is not supported\n"); | ||
1174 | continue; | ||
1175 | niro | 532 | default: |
1176 | bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); | ||
1177 | goto fail; | ||
1178 | } | ||
1179 | } | ||
1180 | niro | 816 | 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 | niro | 532 | int val = 1; |
1195 | if (!strncmp(opt, "no", 2)) { | ||
1196 | val = 0; | ||
1197 | opt += 2; | ||
1198 | } | ||
1199 | niro | 816 | switch (index_in_strings(options, opt)) { |
1200 | niro | 532 | case 0: // "bg" |
1201 | niro | 816 | #if BB_MMU |
1202 | niro | 532 | bg = val; |
1203 | niro | 816 | #endif |
1204 | niro | 532 | break; |
1205 | case 1: // "fg" | ||
1206 | niro | 816 | #if BB_MMU |
1207 | niro | 532 | bg = !val; |
1208 | niro | 816 | #endif |
1209 | niro | 532 | 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 | niro | 816 | case 11: //rdirplus |
1241 | nordirplus = !val; | ||
1242 | break; | ||
1243 | niro | 532 | 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 | niro | 816 | | (noac ? NFS_MOUNT_NOAC : 0) |
1256 | | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0); | ||
1257 | niro | 532 | 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 | niro | 816 | daemonized = daemonize(); |
1287 | niro | 532 | 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 | niro | 816 | } |
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 | niro | 532 | 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 | niro | 816 | struct pmap pm_mnt; |
1331 | niro | 532 | 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 | niro | 816 | //FIXME: use monotonic()? |
1340 | niro | 532 | timeout = time(NULL) + 60 * retry; |
1341 | prevt = 0; | ||
1342 | t = 30; | ||
1343 | niro | 816 | retry: |
1344 | niro | 532 | /* be careful not to use too many CPU cycles */ |
1345 | if (t - prevt < 30) | ||
1346 | sleep(30); | ||
1347 | |||
1348 | niro | 816 | get_mountport(&pm_mnt, &mount_server_addr, |
1349 | niro | 532 | mountprog, |
1350 | mountvers, | ||
1351 | proto, | ||
1352 | mountport); | ||
1353 | niro | 816 | nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers; |
1354 | niro | 532 | |
1355 | /* contact the mount daemon via TCP */ | ||
1356 | niro | 816 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
1357 | niro | 532 | msock = RPC_ANYSOCK; |
1358 | |||
1359 | niro | 816 | switch (pm_mnt.pm_prot) { |
1360 | niro | 532 | case IPPROTO_UDP: |
1361 | mclient = clntudp_create(&mount_server_addr, | ||
1362 | niro | 816 | pm_mnt.pm_prog, |
1363 | pm_mnt.pm_vers, | ||
1364 | niro | 532 | retry_timeout, |
1365 | &msock); | ||
1366 | if (mclient) | ||
1367 | break; | ||
1368 | niro | 816 | mount_server_addr.sin_port = htons(pm_mnt.pm_port); |
1369 | niro | 532 | msock = RPC_ANYSOCK; |
1370 | case IPPROTO_TCP: | ||
1371 | mclient = clnttcp_create(&mount_server_addr, | ||
1372 | niro | 816 | pm_mnt.pm_prog, |
1373 | pm_mnt.pm_vers, | ||
1374 | niro | 532 | &msock, 0, 0); |
1375 | break; | ||
1376 | default: | ||
1377 | niro | 816 | mclient = NULL; |
1378 | niro | 532 | } |
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 | niro | 816 | if (pm_mnt.pm_vers == 3) |
1393 | niro | 532 | 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 | niro | 816 | mclient = NULL; |
1419 | niro | 532 | close(msock); |
1420 | niro | 816 | msock = -1; |
1421 | niro | 532 | } |
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 | niro | 816 | prepare_kernel_data: |
1444 | niro | 532 | |
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 | niro | 816 | msock = -1; |
1517 | niro | 532 | |
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 | niro | 816 | // FIXME: parent doesn't close fsock - ??! |
1527 | niro | 532 | 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 | niro | 816 | do_mount: /* perform actual mount */ |
1539 | niro | 532 | |
1540 | niro | 816 | mp->mnt_type = (char*)"nfs"; |
1541 | niro | 532 | retval = mount_it_now(mp, vfsflags, (char*)&data); |
1542 | goto ret; | ||
1543 | |||
1544 | niro | 816 | fail: /* abort */ |
1545 | niro | 532 | |
1546 | niro | 816 | if (msock >= 0) { |
1547 | niro | 532 | if (mclient) { |
1548 | auth_destroy(mclient->cl_auth); | ||
1549 | clnt_destroy(mclient); | ||
1550 | } | ||
1551 | close(msock); | ||
1552 | } | ||
1553 | niro | 816 | if (fsock >= 0) |
1554 | niro | 532 | close(fsock); |
1555 | |||
1556 | niro | 816 | ret: |
1557 | niro | 532 | 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 | niro | 816 | int nfsmount(struct mntent *mp, long vfsflags, char *filteropts); |
1567 | niro | 532 | |
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 | niro | 816 | int rc = -1; |
1576 | long vfsflags; | ||
1577 | niro | 532 | 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 | niro | 816 | if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0) |
1586 | mp->mnt_type = NULL; | ||
1587 | niro | 532 | |
1588 | niro | 816 | // 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 | niro | 532 | // Might this be an CIFS filesystem? |
1612 | |||
1613 | niro | 816 | 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 | niro | 532 | |
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 | niro | 816 | if (s <= mp->mnt_fsname+1) goto report_error; |
1632 | *s = '\0'; | ||
1633 | lsa = host2sockaddr(mp->mnt_fsname+2, 0); | ||
1634 | niro | 532 | *s = '\\'; |
1635 | niro | 816 | if (!lsa) goto report_error; |
1636 | niro | 532 | |
1637 | niro | 816 | // insert ip=... option into string flags. |
1638 | niro | 532 | |
1639 | niro | 816 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); |
1640 | ip = xasprintf("ip=%s", dotted); | ||
1641 | niro | 532 | parse_mount_options(ip, &filteropts); |
1642 | |||
1643 | // compose new unc '\\server-ip\share' | ||
1644 | niro | 816 | // (s => slash after hostname) |
1645 | niro | 532 | |
1646 | niro | 816 | mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s); |
1647 | niro | 532 | |
1648 | // lock is required | ||
1649 | vfsflags |= MS_MANDLOCK; | ||
1650 | |||
1651 | niro | 816 | mp->mnt_type = (char*)"cifs"; |
1652 | niro | 532 | rc = mount_it_now(mp, vfsflags, filteropts); |
1653 | niro | 816 | if (ENABLE_FEATURE_CLEAN_UP) { |
1654 | free(mp->mnt_fsname); | ||
1655 | free(ip); | ||
1656 | free(dotted); | ||
1657 | free(lsa); | ||
1658 | } | ||
1659 | niro | 532 | goto report_error; |
1660 | } | ||
1661 | |||
1662 | // Might this be an NFS filesystem? | ||
1663 | |||
1664 | niro | 816 | if (ENABLE_FEATURE_MOUNT_NFS |
1665 | && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs")) | ||
1666 | && strchr(mp->mnt_fsname, ':') != NULL | ||
1667 | ) { | ||
1668 | niro | 532 | 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 | niro | 816 | // (We use stat, not lstat, in order to allow |
1675 | // mount symlink_to_file_or_blkdev dir) | ||
1676 | niro | 532 | |
1677 | niro | 816 | if (!stat(mp->mnt_fsname, &st) |
1678 | && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)) | ||
1679 | ) { | ||
1680 | niro | 532 | // 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 | niro | 816 | 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 | niro | 532 | 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 | niro | 816 | // Loop through filesystem types until mount succeeds |
1706 | // or we run out | ||
1707 | niro | 532 | |
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 | niro | 816 | report_error: |
1736 | if (ENABLE_FEATURE_CLEAN_UP) | ||
1737 | free(filteropts); | ||
1738 | niro | 532 | |
1739 | niro | 816 | if (errno == EBUSY && ignore_busy) |
1740 | return 0; | ||
1741 | niro | 532 | if (rc < 0) |
1742 | niro | 816 | bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); |
1743 | niro | 532 | return rc; |
1744 | } | ||
1745 | |||
1746 | // Parse options, if necessary parse fstab/mtab, and call singlemount for | ||
1747 | // each directory to be mounted. | ||
1748 | |||
1749 | niro | 816 | static const char must_be_root[] ALIGN1 = "you must be root"; |
1750 | niro | 532 | |
1751 | niro | 816 | int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
1752 | int mount_main(int argc UNUSED_PARAM, char **argv) | ||
1753 | niro | 532 | { |
1754 | niro | 816 | char *cmdopts = xstrdup(""); |
1755 | char *fstype = NULL; | ||
1756 | char *storage_path; | ||
1757 | llist_t *lst_o = NULL; | ||
1758 | niro | 532 | 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 | niro | 816 | USE_DESKTOP(int nonroot = ) sanitize_env_if_suid(); |
1766 | niro | 532 | |
1767 | niro | 816 | // 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 | niro | 532 | } |
1775 | niro | 816 | argv[j] = NULL; |
1776 | niro | 532 | |
1777 | // Parse remaining options | ||
1778 | niro | 816 | // 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 | niro | 532 | argv += optind; |
1786 | |||
1787 | // If we have no arguments, show currently mounted filesystems | ||
1788 | niro | 816 | if (!argv[0]) { |
1789 | if (!(opt & OPT_a)) { | ||
1790 | niro | 532 | FILE *mountTable = setmntent(bb_path_mtab_file, "r"); |
1791 | |||
1792 | niro | 816 | if (!mountTable) |
1793 | bb_error_msg_and_die("no %s", bb_path_mtab_file); | ||
1794 | niro | 532 | |
1795 | niro | 816 | while (getmntent_r(mountTable, &mtpair[0], getmntent_buf, |
1796 | GETMNTENT_BUFSIZE)) | ||
1797 | niro | 532 | { |
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 | niro | 816 | if (ENABLE_FEATURE_CLEAN_UP) |
1808 | endmntent(mountTable); | ||
1809 | niro | 532 | return EXIT_SUCCESS; |
1810 | } | ||
1811 | niro | 816 | 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 | niro | 532 | |
1832 | niro | 816 | // Past this point, we are handling either "mount -a [opts]" |
1833 | // or "mount [opts] single_param" | ||
1834 | niro | 532 | |
1835 | niro | 816 | i = parse_mount_options(cmdopts, 0); // FIXME: should be "long", not "int" |
1836 | niro | 532 | 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 | niro | 816 | 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 | niro | 532 | } |
1849 | |||
1850 | // Open either fstab or mtab | ||
1851 | fstabname = "/etc/fstab"; | ||
1852 | if (i & MS_REMOUNT) { | ||
1853 | niro | 816 | // 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 | niro | 532 | 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 | niro | 816 | // Loop through entries until we find what we're looking for |
1863 | niro | 532 | memset(mtpair, 0, sizeof(mtpair)); |
1864 | for (;;) { | ||
1865 | niro | 816 | struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair); |
1866 | niro | 532 | |
1867 | // Get next fstab entry | ||
1868 | niro | 816 | 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 | niro | 532 | } |
1875 | |||
1876 | niro | 816 | // 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 | niro | 532 | |
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 | niro | 816 | // Remember this entry. Something later may have |
1888 | // overmounted it, and we want the _last_ match. | ||
1889 | mtcur = mtother; | ||
1890 | niro | 532 | |
1891 | niro | 816 | // If we're mounting all |
1892 | niro | 532 | } else { |
1893 | // Do we need to match a filesystem type? | ||
1894 | niro | 816 | if (fstype && match_fstype(mtcur, fstype)) |
1895 | continue; | ||
1896 | niro | 532 | |
1897 | // Skip noauto and swap anyway. | ||
1898 | niro | 816 | if (parse_mount_options(mtcur->mnt_opts, 0) & (MOUNT_NOAUTO | MOUNT_SWAP)) |
1899 | continue; | ||
1900 | niro | 532 | |
1901 | // No, mount -a won't mount anything, | ||
1902 | niro | 816 | // even user mounts, for mere humans |
1903 | niro | 532 | if (nonroot) |
1904 | bb_error_msg_and_die(must_be_root); | ||
1905 | |||
1906 | niro | 816 | // Mount this thing |
1907 | if (ENABLE_FEATURE_MOUNT_LABEL) | ||
1908 | resolve_mount_spec(&mtpair->mnt_fsname); | ||
1909 | niro | 532 | |
1910 | // NFS mounts want this to be xrealloc-able | ||
1911 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); | ||
1912 | if (singlemount(mtcur, 1)) { | ||
1913 | niro | 816 | // Count number of failed mounts |
1914 | niro | 532 | rc++; |
1915 | } | ||
1916 | free(mtcur->mnt_opts); | ||
1917 | } | ||
1918 | } | ||
1919 | |||
1920 | niro | 816 | // 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 | niro | 532 | |
1933 | niro | 816 | // 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 | niro | 532 | if (ENABLE_FEATURE_CLEAN_UP) { |
1947 | free(storage_path); | ||
1948 | free(cmdopts); | ||
1949 | } | ||
1950 | return rc; | ||
1951 | } |