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-rw-r--r--mount.c498
1 files changed, 0 insertions, 498 deletions
diff --git a/mount.c b/mount.c
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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 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
22 * searches through fstab when -a is passed
23 * will try mounting stuff with all fses when passed -t auto
24 *
25 * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
26 *
27 * 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
28 * Rewrite of a lot of code. Removed mtab usage (I plan on
29 * putting it back as a compile-time option some time),
30 * major adjustments to option parsing, and some serious
31 * dieting all around.
32 *
33 * 1999-11-06 mtab suppport is back - andersee
34 *
35 * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
36 * mount to add loop support.
37 *
38 * 2000-04-30 Dave Cinege <dcinege@psychosis.com>
39 * Rewrote fstab while loop and lower mount section. Can now do
40 * single mounts from fstab. Can override fstab options for single
41 * mount. Common mount_one call for single mounts and 'all'. Fixed
42 * mtab updating and stale entries. Removed 'remount' default.
43 *
44 */
45
46#include <limits.h>
47#include <stdlib.h>
48#include <unistd.h>
49#include <errno.h>
50#include <string.h>
51#include <stdio.h>
52#include <mntent.h>
53#include <ctype.h>
54#include "busybox.h"
55#if defined BB_FEATURE_USE_DEVPS_PATCH
56# include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
57#endif
58
59enum {
60 MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
61 MS_RDONLY = 1, /* Mount read-only */
62 MS_NOSUID = 2, /* Ignore suid and sgid bits */
63 MS_NODEV = 4, /* Disallow access to device special files */
64 MS_NOEXEC = 8, /* Disallow program execution */
65 MS_SYNCHRONOUS = 16, /* Writes are synced at once */
66 MS_REMOUNT = 32, /* Alter flags of a mounted FS */
67 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
68 S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
69 S_APPEND = 256, /* Append-only file */
70 S_IMMUTABLE = 512, /* Immutable file */
71 MS_NOATIME = 1024, /* Do not update access times. */
72 MS_NODIRATIME = 2048, /* Do not update directory access times */
73 MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
74};
75
76
77#if defined BB_FEATURE_MOUNT_LOOP
78#include <fcntl.h>
79#include <sys/ioctl.h>
80static int use_loop = FALSE;
81#endif
82
83extern int mount (__const char *__special_file, __const char *__dir,
84 __const char *__fstype, unsigned long int __rwflag,
85 __const void *__data);
86extern int umount (__const char *__special_file);
87extern int umount2 (__const char *__special_file, int __flags);
88
89extern int sysfs( int option, unsigned int fs_index, char * buf);
90
91extern const char mtab_file[]; /* Defined in utility.c */
92
93struct mount_options {
94 const char *name;
95 unsigned long and;
96 unsigned long or;
97};
98
99static const struct mount_options mount_options[] = {
100 {"async", ~MS_SYNCHRONOUS, 0},
101 {"atime", ~0, ~MS_NOATIME},
102 {"defaults", ~0, 0},
103 {"dev", ~MS_NODEV, 0},
104 {"diratime", ~0, ~MS_NODIRATIME},
105 {"exec", ~MS_NOEXEC, 0},
106 {"noatime", ~0, MS_NOATIME},
107 {"nodev", ~0, MS_NODEV},
108 {"nodiratime", ~0, MS_NODIRATIME},
109 {"noexec", ~0, MS_NOEXEC},
110 {"nosuid", ~0, MS_NOSUID},
111 {"remount", ~0, MS_REMOUNT},
112 {"ro", ~0, MS_RDONLY},
113 {"rw", ~MS_RDONLY, 0},
114 {"suid", ~MS_NOSUID, 0},
115 {"sync", ~0, MS_SYNCHRONOUS},
116 {"bind", ~0, MS_BIND},
117 {0, 0, 0}
118};
119
120static int
121do_mount(char *specialfile, char *dir, char *filesystemtype,
122 long flags, void *string_flags, int useMtab, int fakeIt,
123 char *mtab_opts, int mount_all)
124{
125 int status = 0;
126#if defined BB_FEATURE_MOUNT_LOOP
127 char *lofile = NULL;
128#endif
129
130 if (fakeIt == FALSE)
131 {
132#if defined BB_FEATURE_MOUNT_LOOP
133 if (use_loop==TRUE) {
134 int loro = flags & MS_RDONLY;
135
136 lofile = specialfile;
137
138 specialfile = find_unused_loop_device();
139 if (specialfile == NULL) {
140 error_msg_and_die("Could not find a spare loop device");
141 }
142 if (set_loop(specialfile, lofile, 0, &loro)) {
143 error_msg_and_die("Could not setup loop device");
144 }
145 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
146 error_msg("WARNING: loop device is read-only");
147 flags |= MS_RDONLY;
148 }
149 }
150#endif
151 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
152 if (status < 0 && errno == EROFS) {
153 error_msg("%s is write-protected, mounting read-only", specialfile);
154 status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
155 }
156 /* Don't whine about already mounted filesystems when mounting all. */
157 if (status < 0 && errno == EBUSY && mount_all)
158 return TRUE;
159 }
160
161
162 /* If the mount was sucessful, do anything needed, then return TRUE */
163 if (status == 0 || fakeIt==TRUE) {
164
165#if defined BB_FEATURE_MTAB_SUPPORT
166 if (useMtab == TRUE) {
167 erase_mtab(specialfile); // Clean any stale entries
168 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
169 }
170#endif
171 return (TRUE);
172 }
173
174 /* Bummer. mount failed. Clean up */
175#if defined BB_FEATURE_MOUNT_LOOP
176 if (lofile != NULL) {
177 del_loop(specialfile);
178 }
179#endif
180
181 if (errno == EPERM) {
182 error_msg_and_die("permission denied. Are you root?");
183 }
184
185 return (FALSE);
186}
187
188
189
190/* Seperate standard mount options from the nonstandard string options */
191static void
192parse_mount_options(char *options, int *flags, char *strflags)
193{
194 while (options) {
195 int gotone = FALSE;
196 char *comma = strchr(options, ',');
197 const struct mount_options *f = mount_options;
198
199 if (comma)
200 *comma = '\0';
201
202 while (f->name != 0) {
203 if (strcasecmp(f->name, options) == 0) {
204
205 *flags &= f->and;
206 *flags |= f->or;
207 gotone = TRUE;
208 break;
209 }
210 f++;
211 }
212#if defined BB_FEATURE_MOUNT_LOOP
213 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
214 use_loop = TRUE;
215 gotone = TRUE;
216 }
217#endif
218 if (*strflags && strflags != '\0' && gotone == FALSE) {
219 char *temp = strflags;
220
221 temp += strlen(strflags);
222 *temp++ = ',';
223 *temp++ = '\0';
224 }
225 if (gotone == FALSE)
226 strcat(strflags, options);
227 if (comma) {
228 *comma = ',';
229 options = ++comma;
230 } else {
231 break;
232 }
233 }
234}
235
236static int
237mount_one(char *blockDevice, char *directory, char *filesystemType,
238 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
239 char *mtab_opts, int whineOnErrors, int mount_all)
240{
241 int status = 0;
242
243#if defined BB_FEATURE_USE_DEVPS_PATCH
244 if (strcmp(filesystemType, "auto") == 0) {
245 static const char *noauto_array[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", "usbdevfs", 0 };
246 const char **noauto_fstype;
247 const int num_of_filesystems = sysfs(3, 0, 0);
248 char buf[255];
249 int i=0;
250
251 filesystemType=buf;
252
253 while(i < num_of_filesystems) {
254 sysfs(2, i++, filesystemType);
255 for (noauto_fstype = noauto_array; *noauto_fstype; noauto_fstype++) {
256 if (!strcmp(filesystemType, *noauto_fstype)) {
257 break;
258 }
259 }
260 if (!*noauto_fstype) {
261 status = do_mount(blockDevice, directory, filesystemType,
262 flags | MS_MGC_VAL, string_flags,
263 useMtab, fakeIt, mtab_opts, mount_all);
264 if (status == TRUE)
265 break;
266 }
267 }
268 }
269#else
270 if (strcmp(filesystemType, "auto") == 0) {
271 char buf[255];
272 FILE *f = xfopen("/proc/filesystems", "r");
273
274 while (fgets(buf, sizeof(buf), f) != NULL) {
275 filesystemType = buf;
276 if (*filesystemType == '\t') { // Not a nodev filesystem
277
278 // Add NULL termination to each line
279 while (*filesystemType && *filesystemType != '\n')
280 filesystemType++;
281 *filesystemType = '\0';
282
283 filesystemType = buf;
284 filesystemType++; // hop past tab
285
286 status = do_mount(blockDevice, directory, filesystemType,
287 flags | MS_MGC_VAL, string_flags,
288 useMtab, fakeIt, mtab_opts, mount_all);
289 if (status == TRUE)
290 break;
291 }
292 }
293 fclose(f);
294 }
295#endif
296 else {
297 status = do_mount(blockDevice, directory, filesystemType,
298 flags | MS_MGC_VAL, string_flags, useMtab,
299 fakeIt, mtab_opts, mount_all);
300 }
301
302 if (status == FALSE) {
303 if (whineOnErrors == TRUE) {
304 perror_msg("Mounting %s on %s failed", blockDevice, directory);
305 }
306 return (FALSE);
307 }
308 return (TRUE);
309}
310
311void show_mounts(void)
312{
313#if defined BB_FEATURE_USE_DEVPS_PATCH
314 int fd, i, numfilesystems;
315 char device[] = "/dev/mtab";
316 struct k_mntent *mntentlist;
317
318 /* open device */
319 fd = open(device, O_RDONLY);
320 if (fd < 0)
321 perror_msg_and_die("open failed for `%s'", device);
322
323 /* How many mounted filesystems? We need to know to
324 * allocate enough space for later... */
325 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
326 if (numfilesystems<0)
327 perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
328 mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
329
330 /* Grab the list of mounted filesystems */
331 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
332 perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
333
334 for( i = 0 ; i < numfilesystems ; i++) {
335 printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
336 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
337 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
338 mntentlist[i].mnt_passno);
339 }
340#ifdef BB_FEATURE_CLEAN_UP
341 /* Don't bother to close files or free memory. Exit
342 * does that automagically, so we can save a few bytes */
343 free( mntentlist);
344 close(fd);
345#endif
346 exit(EXIT_SUCCESS);
347#else
348 FILE *mountTable = setmntent(mtab_file, "r");
349
350 if (mountTable) {
351 struct mntent *m;
352
353 while ((m = getmntent(mountTable)) != 0) {
354 char *blockDevice = m->mnt_fsname;
355 if (strcmp(blockDevice, "/dev/root") == 0) {
356 blockDevice = find_real_root_device_name(blockDevice);
357 }
358 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
359 m->mnt_type, m->mnt_opts);
360#ifdef BB_FEATURE_CLEAN_UP
361 if(blockDevice != m->mnt_fsname)
362 free(blockDevice);
363#endif
364 }
365 endmntent(mountTable);
366 } else {
367 perror_msg_and_die("%s", mtab_file);
368 }
369 exit(EXIT_SUCCESS);
370#endif
371}
372
373extern int mount_main(int argc, char **argv)
374{
375 struct stat statbuf;
376 char string_flags_buf[1024] = "";
377 char *string_flags = string_flags_buf;
378 char *extra_opts = string_flags_buf;
379 int flags = 0;
380 char *filesystemType = "auto";
381 char *device = xmalloc(PATH_MAX);
382 char *directory = xmalloc(PATH_MAX);
383 int all = FALSE;
384 int fakeIt = FALSE;
385 int useMtab = TRUE;
386 int rc = EXIT_FAILURE;
387 int fstabmount = FALSE;
388 int opt;
389
390 /* Parse options */
391 while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
392 switch (opt) {
393 case 'o':
394 parse_mount_options(optarg, &flags, string_flags);
395 break;
396 case 'r':
397 flags |= MS_RDONLY;
398 break;
399 case 't':
400 filesystemType = optarg;
401 break;
402 case 'w':
403 flags &= ~MS_RDONLY;
404 break;
405 case 'a':
406 all = TRUE;
407 break;
408 case 'f':
409 fakeIt = TRUE;
410 break;
411#ifdef BB_FEATURE_MTAB_SUPPORT
412 case 'n':
413 useMtab = FALSE;
414 break;
415#endif
416 case 'v':
417 break; /* ignore -v */
418 }
419 }
420
421 if (!all && optind == argc)
422 show_mounts();
423
424 if (optind < argc) {
425 /* if device is a filename get its real path */
426 if (stat(argv[optind], &statbuf) == 0) {
427 device = simplify_path(argv[optind]);
428 } else {
429 safe_strncpy(device, argv[optind], PATH_MAX);
430 }
431 }
432
433 if (optind + 1 < argc)
434 directory = simplify_path(argv[optind + 1]);
435
436 if (all == TRUE || optind + 1 == argc) {
437 struct mntent *m = NULL;
438 FILE *f = setmntent("/etc/fstab", "r");
439 fstabmount = TRUE;
440
441 if (f == NULL)
442 perror_msg_and_die( "\nCannot read /etc/fstab");
443
444 while ((m = getmntent(f)) != NULL) {
445 if (all == FALSE && optind + 1 == argc && (
446 (strcmp(device, m->mnt_fsname) != 0) &&
447 (strcmp(device, m->mnt_dir) != 0) ) ) {
448 continue;
449 }
450
451 if (all == TRUE && ( // If we're mounting 'all'
452 (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
453 (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
454 (strstr(m->mnt_type, "nfs")) ) ) {
455 continue;
456 }
457
458 if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
459 flags = 0;
460 *string_flags = '\0';
461 parse_mount_options(m->mnt_opts, &flags, string_flags);
462 }
463
464 strcpy(device, m->mnt_fsname);
465 strcpy(directory, m->mnt_dir);
466 filesystemType = strdup(m->mnt_type);
467singlemount:
468 string_flags = strdup(string_flags);
469 rc = EXIT_SUCCESS;
470#ifdef BB_NFSMOUNT
471 if (strchr(device, ':') != NULL)
472 filesystemType = "nfs";
473 if (strcmp(filesystemType, "nfs") == 0) {
474 if (nfsmount (device, directory, &flags, &extra_opts,
475 &string_flags, 1)) {
476 perror_msg("nfsmount failed");
477 rc = EXIT_FAILURE;
478 }
479 }
480#endif
481 if (!mount_one(device, directory, filesystemType, flags,
482 string_flags, useMtab, fakeIt, extra_opts, TRUE, all))
483 rc = EXIT_FAILURE;
484
485 if (all == FALSE)
486 break;
487 }
488 if (fstabmount == TRUE)
489 endmntent(f);
490
491 if (all == FALSE && fstabmount == TRUE && m == NULL)
492 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
493
494 return rc;
495 }
496
497 goto singlemount;
498}
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