1 /* vi: set sw=4 ts=4: */
3 * Mini mount implementation for busybox
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>
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 // Design notes: There is no spec for mount. Remind me to write one.
13 // mount_main() calls singlemount() which calls mount_it_now().
15 // mount_main() can loop through /etc/fstab for mount -a
16 // singlemount() can loop through /etc/filesystems for fstype detection.
17 // mount_it_now() does the actual mount.
20 //usage:#define mount_trivial_usage
21 //usage: "[OPTIONS] [-o OPTS] DEVICE NODE"
22 //usage:#define mount_full_usage "\n\n"
23 //usage: "Mount a filesystem. Filesystem autodetection requires /proc.\n"
24 //usage: "\n -a Mount all filesystems in fstab"
25 //usage: IF_FEATURE_MOUNT_FAKE(
26 //usage: IF_FEATURE_MTAB_SUPPORT(
27 //usage: "\n -f Update /etc/mtab, but don't mount"
29 //usage: IF_NOT_FEATURE_MTAB_SUPPORT(
30 //usage: "\n -f Dry run"
33 //usage: IF_FEATURE_MOUNT_HELPERS(
34 //usage: "\n -i Don't run mount helper"
36 //usage: IF_FEATURE_MTAB_SUPPORT(
37 //usage: "\n -n Don't update /etc/mtab"
39 //usage: IF_FEATURE_MOUNT_VERBOSE(
40 //usage: "\n -v Verbose"
42 ////usage: "\n -s Sloppy (ignored)"
43 //usage: "\n -r Read-only mount"
44 //usage: "\n -w Read-write mount (default)"
45 //usage: "\n -t FSTYPE[,...] Filesystem type(s)"
46 //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)"
48 //usage: IF_FEATURE_MOUNT_LOOP(
49 //usage: "\n loop Ignored (loop devices are autodetected)"
51 //usage: IF_FEATURE_MOUNT_FLAGS(
52 //usage: "\n [a]sync Writes are [a]synchronous"
53 //usage: "\n [no]atime Disable/enable updates to inode access times"
54 //usage: "\n [no]diratime Disable/enable atime updates to directories"
55 //usage: "\n [no]relatime Disable/enable atime updates relative to modification time"
56 //usage: "\n [no]dev (Dis)allow use of special device files"
57 //usage: "\n [no]exec (Dis)allow use of executable files"
58 //usage: "\n [no]suid (Dis)allow set-user-id-root programs"
59 //usage: "\n [r]shared Convert [recursively] to a shared subtree"
60 //usage: "\n [r]slave Convert [recursively] to a slave subtree"
61 //usage: "\n [r]private Convert [recursively] to a private subtree"
62 //usage: "\n [un]bindable Make mount point [un]able to be bind mounted"
63 //usage: "\n [r]bind Bind a file or directory [recursively] to another location"
64 //usage: "\n move Relocate an existing mount point"
66 //usage: "\n remount Remount a mounted filesystem, changing flags"
67 //usage: "\n ro/rw Same as -r/-w"
69 //usage: "\nThere are filesystem-specific -o flags."
71 //usage:#define mount_example_usage
73 //usage: "/dev/hda3 on / type minix (rw)\n"
74 //usage: "proc on /proc type proc (rw)\n"
75 //usage: "devpts on /dev/pts type devpts (rw)\n"
76 //usage: "$ mount /dev/fd0 /mnt -t msdos -o ro\n"
77 //usage: "$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
78 //usage: "$ mount cd_image.iso mydir\n"
79 //usage:#define mount_notes_usage
80 //usage: "Returns 0 for success, number of failed mounts for -a, or errno for one mount."
84 #include <sys/mount.h>
85 // Grab more as needed from util-linux's mount/mount_constants.h
87 # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous
90 # define MS_UNION (1 << 8)
93 # define MS_BIND (1 << 12)
96 # define MS_MOVE (1 << 13)
99 # define MS_RECURSIVE (1 << 14)
102 # define MS_SILENT (1 << 15)
104 // The shared subtree stuff, which went in around 2.6.15
105 #ifndef MS_UNBINDABLE
106 # define MS_UNBINDABLE (1 << 17)
109 # define MS_PRIVATE (1 << 18)
112 # define MS_SLAVE (1 << 19)
115 # define MS_SHARED (1 << 20)
118 # define MS_RELATIME (1 << 21)
120 #ifndef MS_STRICTATIME
121 # define MS_STRICTATIME (1 << 24)
124 /* Any ~MS_FOO value has this bit set: */
125 #define BB_MS_INVERTED_VALUE (1u << 31)
128 #if ENABLE_FEATURE_MOUNT_LABEL
129 # include "volume_id.h"
131 # define resolve_mount_spec(fsname) ((void)0)
134 // Needed for nfs support only
135 #include <sys/utsname.h>
138 #if ENABLE_FEATURE_MOUNT_NFS
139 /* This is just a warning of a common mistake. Possibly this should be a
140 * uclibc faq entry rather than in busybox... */
141 # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
142 # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
144 # include <rpc/rpc.h>
145 # include <rpc/pmap_prot.h>
146 # include <rpc/pmap_clnt.h>
150 #if defined(__dietlibc__)
151 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
152 // dietlibc-0.30 does not have implementation of getmntent_r()
153 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
154 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
156 struct mntent* ment = getmntent(stream);
157 return memcpy(result, ment, sizeof(*ment));
162 // Not real flags, but we want to be able to check for this.
164 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
165 MOUNT_NOAUTO = (1 << 29),
166 MOUNT_SWAP = (1 << 30),
170 #define OPTION_STR "o:t:rwanfvsiO:"
185 #if ENABLE_FEATURE_MTAB_SUPPORT
186 #define USE_MTAB (!(option_mask32 & OPT_n))
191 #if ENABLE_FEATURE_MOUNT_FAKE
192 #define FAKE_IT (option_mask32 & OPT_f)
197 #if ENABLE_FEATURE_MOUNT_HELPERS
198 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
200 #define HELPERS_ALLOWED 0
204 // TODO: more "user" flag compatibility.
205 // "user" option (from mount manpage):
206 // Only the user that mounted a filesystem can unmount it again.
207 // If any user should be able to unmount, then use users instead of user
208 // in the fstab line. The owner option is similar to the user option,
209 // with the restriction that the user must be the owner of the special file.
210 // This may be useful e.g. for /dev/fd if a login script makes
211 // the console user owner of this device.
213 // Standard mount options (from -o options or --options),
214 // with corresponding flags
215 static const int32_t mount_options[] = {
216 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
218 IF_FEATURE_MOUNT_LOOP(
222 IF_FEATURE_MOUNT_FSTAB(
224 /* "quiet" 0 - do not filter out, vfat wants to see it */
225 /* "noauto" */ MOUNT_NOAUTO,
226 /* "sw" */ MOUNT_SWAP,
227 /* "swap" */ MOUNT_SWAP,
228 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
229 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
231 IF_DESKTOP(/* "comment=" */ 0,) /* systemd uses this in fstab */
234 IF_FEATURE_MOUNT_FLAGS(
236 /* "nosuid" */ MS_NOSUID,
237 /* "suid" */ ~MS_NOSUID,
238 /* "dev" */ ~MS_NODEV,
239 /* "nodev" */ MS_NODEV,
240 /* "exec" */ ~MS_NOEXEC,
241 /* "noexec" */ MS_NOEXEC,
242 /* "sync" */ MS_SYNCHRONOUS,
243 /* "dirsync" */ MS_DIRSYNC,
244 /* "async" */ ~MS_SYNCHRONOUS,
245 /* "atime" */ ~MS_NOATIME,
246 /* "noatime" */ MS_NOATIME,
247 /* "diratime" */ ~MS_NODIRATIME,
248 /* "nodiratime" */ MS_NODIRATIME,
249 /* "mand" */ MS_MANDLOCK,
250 /* "nomand" */ ~MS_MANDLOCK,
251 /* "relatime" */ MS_RELATIME,
252 /* "norelatime" */ ~MS_RELATIME,
253 /* "strictatime" */ MS_STRICTATIME,
254 /* "loud" */ ~MS_SILENT,
255 /* "rbind" */ MS_BIND|MS_RECURSIVE,
258 /* "union" */ MS_UNION,
259 /* "bind" */ MS_BIND,
260 /* "move" */ MS_MOVE,
261 /* "shared" */ MS_SHARED,
262 /* "slave" */ MS_SLAVE,
263 /* "private" */ MS_PRIVATE,
264 /* "unbindable" */ MS_UNBINDABLE,
265 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
266 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
267 /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE,
268 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
271 // Always understood.
272 /* "ro" */ MS_RDONLY, // vfs flag
273 /* "rw" */ ~MS_RDONLY, // vfs flag
274 /* "remount" */ MS_REMOUNT // action flag
277 static const char mount_option_str[] =
278 IF_FEATURE_MOUNT_LOOP(
281 IF_FEATURE_MOUNT_FSTAB(
283 // "quiet\0" - do not filter out, vfat wants to see it
288 IF_DESKTOP("users\0")
290 IF_DESKTOP("comment=\0") /* systemd uses this in fstab */
292 IF_FEATURE_MOUNT_FLAGS(
329 // Always understood.
332 "remount\0" // action flag
337 #if ENABLE_FEATURE_MOUNT_NFS
338 smalluint nfs_mount_version;
340 #if ENABLE_FEATURE_MOUNT_VERBOSE
344 char getmntent_buf[1];
346 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
347 #define G (*(struct globals*)&bb_common_bufsiz1)
348 #define nfs_mount_version (G.nfs_mount_version)
349 #if ENABLE_FEATURE_MOUNT_VERBOSE
350 #define verbose (G.verbose )
354 #define fslist (G.fslist )
355 #define getmntent_buf (G.getmntent_buf )
356 #define INIT_G() do { } while (0)
358 #if ENABLE_FEATURE_MTAB_SUPPORT
360 * update_mtab_entry_on_move() is used to update entry in case of mount --move.
361 * we are looking for existing entries mnt_dir which is equal to mnt_fsname of
362 * input mntent and replace it by new one.
364 static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp)
366 struct mntent *entries, *m;
370 mountTable = setmntent(bb_path_mtab_file, "r");
372 bb_perror_msg(bb_path_mtab_file);
378 while ((m = getmntent(mountTable)) != NULL) {
379 entries = xrealloc_vector(entries, 3, count);
380 entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
381 entries[count].mnt_dir = xstrdup(m->mnt_dir);
382 entries[count].mnt_type = xstrdup(m->mnt_type);
383 entries[count].mnt_opts = xstrdup(m->mnt_opts);
384 entries[count].mnt_freq = m->mnt_freq;
385 entries[count].mnt_passno = m->mnt_passno;
388 endmntent(mountTable);
390 mountTable = setmntent(bb_path_mtab_file, "w");
392 for (i = 0; i < count; i++) {
393 if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0)
394 addmntent(mountTable, &entries[i]);
396 addmntent(mountTable, mp);
398 endmntent(mountTable);
399 } else if (errno != EROFS)
400 bb_perror_msg(bb_path_mtab_file);
402 if (ENABLE_FEATURE_CLEAN_UP) {
403 for (i = 0; i < count; i++) {
404 free(entries[i].mnt_fsname);
405 free(entries[i].mnt_dir);
406 free(entries[i].mnt_type);
407 free(entries[i].mnt_opts);
414 #if ENABLE_FEATURE_MOUNT_VERBOSE
415 static int verbose_mount(const char *source, const char *target,
416 const char *filesystemtype,
417 unsigned long mountflags, const void *data)
422 rc = mount(source, target, filesystemtype, mountflags, data);
424 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
425 source, target, filesystemtype,
426 mountflags, (char*)data, rc);
430 #define verbose_mount(...) mount(__VA_ARGS__)
433 // Append mount options to string
434 static void append_mount_options(char **oldopts, const char *newopts)
436 if (*oldopts && **oldopts) {
437 // Do not insert options which are already there
440 int len = strlen(newopts);
441 p = strchr(newopts, ',');
442 if (p) len = p - newopts;
445 if (!strncmp(p, newopts, len)
446 && (p[len] == ',' || p[len] == '\0'))
452 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
457 while (newopts[0] == ',') newopts++;
460 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
461 *oldopts = xstrdup(newopts);
465 // Use the mount_options list to parse options into flags.
466 // Also update list of unrecognized options if unrecognized != NULL
467 static unsigned long parse_mount_options(char *options, char **unrecognized)
469 unsigned long flags = MS_SILENT;
471 // Loop through options
474 char *comma = strchr(options, ',');
475 const char *option_str = mount_option_str;
477 if (comma) *comma = '\0';
479 // FIXME: use hasmntopt()
480 // Find this option in mount_options
481 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
482 unsigned opt_len = strlen(option_str);
484 if (strncasecmp(option_str, options, opt_len) == 0
485 && (options[opt_len] == '\0'
486 /* or is it "comment=" thingy in fstab? */
487 IF_FEATURE_MOUNT_FSTAB(IF_DESKTOP( || option_str[opt_len-1] == '=' ))
490 unsigned long fl = mount_options[i];
491 if (fl & BB_MS_INVERTED_VALUE)
497 option_str += opt_len + 1;
499 // We did not recognize this option.
500 // If "unrecognized" is not NULL, append option there.
501 // Note that we should not append *empty* option -
502 // in this case we want to pass NULL, not "", to "data"
503 // parameter of mount(2) syscall.
504 // This is crucial for filesystems that don't accept
505 // any arbitrary mount options, like cgroup fs:
506 // "mount -t cgroup none /mnt"
507 if (options[0] && unrecognized) {
508 // Add it to strflags, to pass on to kernel
509 char *p = *unrecognized;
510 unsigned len = p ? strlen(p) : 0;
511 *unrecognized = p = xrealloc(p, len + strlen(options) + 2);
513 // Comma separated if it's not the first one
514 if (len) p[len++] = ',';
515 strcpy(p + len, options);
520 // Advance to next option
528 // Return a list of all block device backed filesystems
529 static llist_t *get_block_backed_filesystems(void)
531 static const char filesystems[2][sizeof("/proc/filesystems")] = {
536 llist_t *list = NULL;
540 for (i = 0; i < 2; i++) {
541 f = fopen_for_read(filesystems[i]);
544 while ((buf = xmalloc_fgetline(f)) != NULL) {
545 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
547 fs = skip_whitespace(buf);
548 if (*fs == '#' || *fs == '*' || !*fs)
551 llist_add_to_end(&list, xstrdup(fs));
555 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
561 #if ENABLE_FEATURE_CLEAN_UP
562 static void delete_block_backed_filesystems(void)
564 llist_free(fslist, free);
567 void delete_block_backed_filesystems(void);
570 // Perform actual mount of specific filesystem at specific location.
571 // NB: mp->xxx fields may be trashed on exit
572 static int mount_it_now(struct mntent *mp, unsigned long vfsflags, char *filteropts)
578 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
579 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
580 vfsflags, filteropts);
584 // Mount, with fallback to read-only if necessary.
587 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
588 vfsflags, filteropts);
590 // If mount failed, try
591 // helper program mount.<mnt_type>
592 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
594 int errno_save = errno;
595 args[0] = xasprintf("mount.%s", mp->mnt_type);
598 args[rc++] = (char *)"-f";
599 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
600 args[rc++] = (char *)"-n";
601 args[rc++] = mp->mnt_fsname;
602 args[rc++] = mp->mnt_dir;
604 args[rc++] = (char *)"-o";
605 args[rc++] = filteropts;
608 rc = spawn_and_wait(args);
615 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
617 if (!(vfsflags & MS_SILENT))
618 bb_error_msg("%s is write-protected, mounting read-only",
620 vfsflags |= MS_RDONLY;
623 // Abort entirely if permission denied.
625 if (rc && errno == EPERM)
626 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
628 // If the mount was successful, and we're maintaining an old-style
629 // mtab file by hand, add the new entry to it now.
631 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
633 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
634 const char *option_str = mount_option_str;
638 bb_perror_msg(bb_path_mtab_file);
642 // Add vfs string flags
643 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
644 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
645 append_mount_options(&(mp->mnt_opts), option_str);
646 option_str += strlen(option_str) + 1;
649 // Remove trailing / (if any) from directory we mounted on
650 i = strlen(mp->mnt_dir) - 1;
651 while (i > 0 && mp->mnt_dir[i] == '/')
652 mp->mnt_dir[i--] = '\0';
654 // Convert to canonical pathnames as needed
655 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
657 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
658 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
659 mp->mnt_type = (char*)"bind";
661 mp->mnt_freq = mp->mnt_passno = 0;
664 #if ENABLE_FEATURE_MTAB_SUPPORT
665 if (vfsflags & MS_MOVE)
666 update_mtab_entry_on_move(mp);
669 addmntent(mountTable, mp);
670 endmntent(mountTable);
672 if (ENABLE_FEATURE_CLEAN_UP) {
681 #if ENABLE_FEATURE_MOUNT_NFS
685 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
687 * Licensed under GPLv2, see file LICENSE in this source tree.
689 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
690 * numbers to be specified on the command line.
692 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
693 * Omit the call to connect() for Linux version 1.3.11 or later.
695 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
696 * Implemented the "bg", "fg" and "retry" mount options for NFS.
698 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
699 * - added Native Language Support
701 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
705 #define MOUNTPORT 635
706 #define MNTPATHLEN 1024
707 #define MNTNAMLEN 255
711 typedef char fhandle[FHSIZE];
714 unsigned int fhandle3_len;
726 MNT3ERR_NAMETOOLONG = 63,
727 MNT3ERR_NOTSUPP = 10004,
728 MNT3ERR_SERVERFAULT = 10006,
730 typedef enum mountstat3 mountstat3;
733 unsigned int fhs_status;
738 typedef struct fhstatus fhstatus;
740 struct mountres3_ok {
743 unsigned int auth_flavours_len;
744 char *auth_flavours_val;
747 typedef struct mountres3_ok mountres3_ok;
750 mountstat3 fhs_status;
752 mountres3_ok mountinfo;
755 typedef struct mountres3 mountres3;
757 typedef char *dirpath;
761 typedef struct mountbody *mountlist;
765 dirpath ml_directory;
768 typedef struct mountbody mountbody;
770 typedef struct groupnode *groups;
776 typedef struct groupnode groupnode;
778 typedef struct exportnode *exports;
785 typedef struct exportnode exportnode;
798 typedef struct ppathcnf ppathcnf;
800 #define MOUNTPROG 100005
803 #define MOUNTPROC_NULL 0
804 #define MOUNTPROC_MNT 1
805 #define MOUNTPROC_DUMP 2
806 #define MOUNTPROC_UMNT 3
807 #define MOUNTPROC_UMNTALL 4
808 #define MOUNTPROC_EXPORT 5
809 #define MOUNTPROC_EXPORTALL 6
811 #define MOUNTVERS_POSIX 2
813 #define MOUNTPROC_PATHCONF 7
817 #define MOUNTPROC3_NULL 0
818 #define MOUNTPROC3_MNT 1
819 #define MOUNTPROC3_DUMP 2
820 #define MOUNTPROC3_UMNT 3
821 #define MOUNTPROC3_UMNTALL 4
822 #define MOUNTPROC3_EXPORT 5
834 * We want to be able to compile mount on old kernels in such a way
835 * that the binary will work well on more recent kernels.
836 * Thus, if necessary we teach nfsmount.c the structure of new fields
837 * that will come later.
839 * Moreover, the new kernel includes conflict with glibc includes
840 * so it is easiest to ignore the kernel altogether (at compile time).
848 unsigned char data[64];
851 struct nfs_mount_data {
854 struct nfs2_fh old_root; /* 1 */
860 int acregmin; /* 1 */
861 int acregmax; /* 1 */
862 int acdirmin; /* 1 */
863 int acdirmax; /* 1 */
864 struct sockaddr_in addr; /* 1 */
865 char hostname[256]; /* 1 */
867 unsigned int bsize; /* 3 */
868 struct nfs3_fh root; /* 4 */
871 /* bits in the flags field */
873 NFS_MOUNT_SOFT = 0x0001, /* 1 */
874 NFS_MOUNT_INTR = 0x0002, /* 1 */
875 NFS_MOUNT_SECURE = 0x0004, /* 1 */
876 NFS_MOUNT_POSIX = 0x0008, /* 1 */
877 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
878 NFS_MOUNT_NOAC = 0x0020, /* 1 */
879 NFS_MOUNT_TCP = 0x0040, /* 2 */
880 NFS_MOUNT_VER3 = 0x0080, /* 3 */
881 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
882 NFS_MOUNT_NONLM = 0x0200, /* 3 */
883 NFS_MOUNT_NOACL = 0x0800, /* 4 */
884 NFS_MOUNT_NORDIRPLUS = 0x4000
889 * We need to translate between nfs status return values and
890 * the local errno values which may not be the same.
892 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
893 * "after #include <errno.h> the symbol errno is reserved for any use,
894 * it cannot even be used as a struct tag or field name".
897 # define EDQUOT ENOSPC
899 /* Convert each NFSERR_BLAH into EBLAH */
900 static const uint8_t nfs_err_stat[] = {
902 19, 20, 21, 22, 27, 28,
903 30, 63, 66, 69, 70, 71
906 EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \
907 ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \
908 EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256
909 typedef uint8_t nfs_err_type;
911 typedef uint16_t nfs_err_type;
913 static const nfs_err_type nfs_err_errnum[] = {
914 EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
915 ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
916 EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
918 static char *nfs_strerror(int status)
922 for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
923 if (nfs_err_stat[i] == status)
924 return strerror(nfs_err_errnum[i]);
926 return xasprintf("unknown nfs status return value: %d", status);
929 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
931 return xdr_opaque(xdrs, objp, FHSIZE);
934 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
936 if (!xdr_u_int(xdrs, &objp->fhs_status))
938 if (objp->fhs_status == 0)
939 return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle);
943 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
945 return xdr_string(xdrs, objp, MNTPATHLEN);
948 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
950 return xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
951 (unsigned int *) &objp->fhandle3_len,
955 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
957 if (!xdr_fhandle3(xdrs, &objp->fhandle))
959 return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
960 &(objp->auth_flavours.auth_flavours_len),
963 (xdrproc_t) xdr_int);
966 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
968 return xdr_enum(xdrs, (enum_t *) objp);
971 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
973 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
975 if (objp->fhs_status == MNT_OK)
976 return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo);
980 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
983 * Unfortunately, the kernel prints annoying console messages
984 * in case of an unexpected nfs mount version (instead of
985 * just returning some error). Therefore we'll have to try
986 * and figure out what version the kernel expects.
989 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
990 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
991 * nfs_mount_version: version this source and running kernel can handle
994 find_kernel_nfs_mount_version(void)
998 if (nfs_mount_version)
1001 nfs_mount_version = 4; /* default */
1003 kernel_version = get_linux_version_code();
1004 if (kernel_version) {
1005 if (kernel_version < KERNEL_VERSION(2,2,18))
1006 nfs_mount_version = 3;
1007 /* else v4 since 2.3.99pre4 */
1012 get_mountport(struct pmap *pm_mnt,
1013 struct sockaddr_in *server_addr,
1015 long unsigned version,
1016 long unsigned proto,
1019 struct pmaplist *pmap;
1021 server_addr->sin_port = PMAPPORT;
1022 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
1023 * I understand it like "IPv6 for this is not 100% ready" */
1024 pmap = pmap_getmaps(server_addr);
1026 if (version > MAX_NFSPROT)
1027 version = MAX_NFSPROT;
1030 pm_mnt->pm_prog = prog;
1031 pm_mnt->pm_vers = version;
1032 pm_mnt->pm_prot = proto;
1033 pm_mnt->pm_port = port;
1036 if (pmap->pml_map.pm_prog != prog)
1038 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
1040 if (version > 2 && pmap->pml_map.pm_vers != version)
1042 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
1044 if (pmap->pml_map.pm_vers > MAX_NFSPROT
1045 || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
1046 || (port && pmap->pml_map.pm_port != port)
1050 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
1052 pmap = pmap->pml_next;
1054 if (!pm_mnt->pm_vers)
1055 pm_mnt->pm_vers = MOUNTVERS;
1056 if (!pm_mnt->pm_port)
1057 pm_mnt->pm_port = MOUNTPORT;
1058 if (!pm_mnt->pm_prot)
1059 pm_mnt->pm_prot = IPPROTO_TCP;
1063 static int daemonize(void)
1066 if (pid < 0) /* error */
1068 if (pid > 0) /* parent */
1072 xopen(bb_dev_null, O_RDWR);
1076 openlog(applet_name, LOG_PID, LOG_DAEMON);
1077 logmode = LOGMODE_SYSLOG;
1081 static inline int daemonize(void) { return -ENOSYS; }
1085 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
1090 /* RPC strerror analogs are terminally idiotic:
1091 * *mandatory* prefix and \n at end.
1092 * This hopefully helps. Usage:
1093 * error_msg_rpc(clnt_*error*(" ")) */
1094 static void error_msg_rpc(const char *msg)
1097 while (msg[0] == ' ' || msg[0] == ':') msg++;
1099 while (len && msg[len-1] == '\n') len--;
1100 bb_error_msg("%.*s", len, msg);
1103 /* NB: mp->xxx fields may be trashed on exit */
1104 static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
1110 /* prior to 2.6.23, kernel took NFS options in a form of this struct
1111 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
1112 * then data pointer is interpreted as a string. */
1113 struct nfs_mount_data data;
1116 struct sockaddr_in server_addr;
1117 struct sockaddr_in mount_server_addr;
1120 struct fhstatus nfsv2;
1121 struct mountres3 nfsv3;
1139 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1150 find_kernel_nfs_mount_version();
1158 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1160 filteropts = xstrdup(filteropts); /* going to trash it later... */
1162 hostname = xstrdup(mp->mnt_fsname);
1163 /* mount_main() guarantees that ':' is there */
1164 s = strchr(hostname, ':');
1167 /* Ignore all but first hostname in replicated mounts
1168 * until they can be fully supported. (mack@sgi.com) */
1169 s = strchr(hostname, ',');
1172 bb_error_msg("warning: multiple hostnames not supported");
1175 server_addr.sin_family = AF_INET;
1176 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1177 hp = gethostbyname(hostname);
1179 bb_herror_msg("%s", hostname);
1182 if (hp->h_length != (int)sizeof(struct in_addr)) {
1183 bb_error_msg_and_die("only IPv4 is supported");
1185 memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1188 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1190 /* add IP address to mtab options for use when unmounting */
1192 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1193 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1195 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1196 mp->mnt_opts[0] ? "," : "",
1197 inet_ntoa(server_addr.sin_addr));
1202 /* Set default options.
1203 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1204 * let the kernel decide.
1205 * timeo is filled in after we know whether it'll be TCP or UDP. */
1206 memset(&data, 0, sizeof(data));
1212 data.namlen = NAME_MAX;
1222 retry = 10000; /* 10000 minutes ~ 1 week */
1223 tcp = 1; /* nfs-utils uses tcp per default */
1225 mountprog = MOUNTPROG;
1233 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1234 char *opteq = strchr(opt, '=');
1237 static const char options[] ALIGN1 =
1242 /* 4 */ "acregmin\0"
1243 /* 5 */ "acregmax\0"
1244 /* 6 */ "acdirmin\0"
1245 /* 7 */ "acdirmax\0"
1249 /* 11 */ "mountport\0"
1250 /* 12 */ "mounthost\0"
1251 /* 13 */ "mountprog\0"
1252 /* 14 */ "mountvers\0"
1253 /* 15 */ "nfsprog\0"
1254 /* 16 */ "nfsvers\0"
1261 idx = index_in_strings(options, opt);
1263 case 12: // "mounthost"
1264 mounthost = xstrndup(opteq,
1265 strcspn(opteq, " \t\n\r,"));
1268 if (!strncmp(opteq, "tcp", 3))
1270 else if (!strncmp(opteq, "udp", 3))
1273 bb_error_msg("warning: unrecognized proto= option");
1275 case 20: // "addr" - ignore
1278 if (vfsflags & MS_REMOUNT)
1282 val = xatoi_positive(opteq);
1293 case 3: // "retrans"
1296 case 4: // "acregmin"
1297 data.acregmin = val;
1299 case 5: // "acregmax"
1300 data.acregmax = val;
1302 case 6: // "acdirmin"
1303 data.acdirmin = val;
1305 case 7: // "acdirmax"
1306 data.acdirmax = val;
1308 case 8: // "actimeo"
1309 data.acregmin = val;
1310 data.acregmax = val;
1311 data.acdirmin = val;
1312 data.acdirmax = val;
1320 case 11: // "mountport"
1323 case 13: // "mountprog"
1326 case 14: // "mountvers"
1329 case 15: // "nfsprog"
1332 case 16: // "nfsvers"
1336 case 19: // "namlen"
1337 //if (nfs_mount_version >= 2)
1340 // bb_error_msg("warning: option namlen is not supported\n");
1343 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1347 else { /* not of the form opt=val */
1348 static const char options[] ALIGN1 =
1363 if (!strncmp(opt, "no", 2)) {
1367 switch (index_in_strings(options, opt)) {
1403 if (nfs_mount_version >= 3)
1406 bb_error_msg("warning: option nolock is not supported");
1415 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1420 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1422 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1423 | (intr ? NFS_MOUNT_INTR : 0)
1424 | (posix ? NFS_MOUNT_POSIX : 0)
1425 | (nocto ? NFS_MOUNT_NOCTO : 0)
1426 | (noac ? NFS_MOUNT_NOAC : 0)
1427 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0)
1428 | (noacl ? NFS_MOUNT_NOACL : 0);
1429 if (nfs_mount_version >= 2)
1430 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1431 if (nfs_mount_version >= 3)
1432 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1433 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1434 bb_error_msg("NFSv%d not supported", nfsvers);
1437 if (nfsvers && !mountvers)
1438 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1439 if (nfsvers && nfsvers < mountvers) {
1440 mountvers = nfsvers;
1443 /* Adjust options if none specified */
1445 data.timeo = tcp ? 70 : 7;
1447 data.version = nfs_mount_version;
1449 if (vfsflags & MS_REMOUNT)
1453 * If the previous mount operation on the same host was
1454 * backgrounded, and the "bg" for this mount is also set,
1455 * give up immediately, to avoid the initial timeout.
1457 if (bg && we_saw_this_host_before(hostname)) {
1458 daemonized = daemonize();
1459 if (daemonized <= 0) { /* parent or error */
1460 retval = -daemonized;
1465 /* Create mount daemon client */
1466 /* See if the nfs host = mount host. */
1468 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1469 mount_server_addr.sin_family = AF_INET;
1470 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1472 hp = gethostbyname(mounthost);
1474 bb_herror_msg("%s", mounthost);
1477 if (hp->h_length != (int)sizeof(struct in_addr)) {
1478 bb_error_msg_and_die("only IPv4 is supported");
1480 mount_server_addr.sin_family = AF_INET;
1481 memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1486 * The following loop implements the mount retries. When the mount
1487 * times out, and the "bg" option is set, we background ourself
1488 * and continue trying.
1490 * The case where the mount point is not present and the "bg"
1491 * option is set, is treated as a timeout. This is done to
1492 * support nested mounts.
1494 * The "retry" count specified by the user is the number of
1495 * minutes to retry before giving up.
1498 struct timeval total_timeout;
1499 struct timeval retry_timeout;
1505 retry_timeout.tv_sec = 3;
1506 retry_timeout.tv_usec = 0;
1507 total_timeout.tv_sec = 20;
1508 total_timeout.tv_usec = 0;
1509 /* FIXME: use monotonic()? */
1510 timeout = time(NULL) + 60 * retry;
1514 /* Be careful not to use too many CPU cycles */
1518 get_mountport(&pm_mnt, &mount_server_addr,
1523 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1525 /* contact the mount daemon via TCP */
1526 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1527 msock = RPC_ANYSOCK;
1529 switch (pm_mnt.pm_prot) {
1531 mclient = clntudp_create(&mount_server_addr,
1538 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1539 msock = RPC_ANYSOCK;
1541 mclient = clnttcp_create(&mount_server_addr,
1550 if (!daemonized && prevt == 0)
1551 error_msg_rpc(clnt_spcreateerror(" "));
1553 enum clnt_stat clnt_stat;
1555 /* Try to mount hostname:pathname */
1556 mclient->cl_auth = authunix_create_default();
1558 /* Make pointers in xdr_mountres3 NULL so
1559 * that xdr_array allocates memory for us
1561 memset(&status, 0, sizeof(status));
1563 if (pm_mnt.pm_vers == 3)
1564 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1565 (xdrproc_t) xdr_dirpath,
1566 (caddr_t) &pathname,
1567 (xdrproc_t) xdr_mountres3,
1571 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1572 (xdrproc_t) xdr_dirpath,
1573 (caddr_t) &pathname,
1574 (xdrproc_t) xdr_fhstatus,
1578 if (clnt_stat == RPC_SUCCESS)
1579 goto prepare_kernel_data; /* we're done */
1580 if (errno != ECONNREFUSED) {
1581 error_msg_rpc(clnt_sperror(mclient, " "));
1582 goto fail; /* don't retry */
1584 /* Connection refused */
1585 if (!daemonized && prevt == 0) /* print just once */
1586 error_msg_rpc(clnt_sperror(mclient, " "));
1587 auth_destroy(mclient->cl_auth);
1588 clnt_destroy(mclient);
1594 /* Timeout. We are going to retry... maybe */
1598 daemonized = daemonize();
1599 if (daemonized <= 0) { /* parent or error */
1600 retval = -daemonized;
1607 /* TODO error message */
1613 prepare_kernel_data:
1616 if (status.nfsv2.fhs_status != 0) {
1617 bb_error_msg("%s:%s failed, reason given by server: %s",
1619 nfs_strerror(status.nfsv2.fhs_status));
1622 memcpy(data.root.data,
1623 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1625 data.root.size = NFS_FHSIZE;
1626 memcpy(data.old_root.data,
1627 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1630 fhandle3 *my_fhandle;
1631 if (status.nfsv3.fhs_status != 0) {
1632 bb_error_msg("%s:%s failed, reason given by server: %s",
1634 nfs_strerror(status.nfsv3.fhs_status));
1637 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1638 memset(data.old_root.data, 0, NFS_FHSIZE);
1639 memset(&data.root, 0, sizeof(data.root));
1640 data.root.size = my_fhandle->fhandle3_len;
1641 memcpy(data.root.data,
1642 (char *) my_fhandle->fhandle3_val,
1643 my_fhandle->fhandle3_len);
1645 data.flags |= NFS_MOUNT_VER3;
1648 /* Create nfs socket for kernel */
1650 if (nfs_mount_version < 3) {
1651 bb_error_msg("NFS over TCP is not supported");
1654 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1656 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1658 bb_perror_msg("nfs socket");
1661 if (bindresvport(fsock, 0) < 0) {
1662 bb_perror_msg("nfs bindresvport");
1666 server_addr.sin_port = PMAPPORT;
1667 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1668 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1672 server_addr.sin_port = htons(port);
1674 /* Prepare data structure for kernel */
1676 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1677 strncpy(data.hostname, hostname, sizeof(data.hostname));
1680 auth_destroy(mclient->cl_auth);
1681 clnt_destroy(mclient);
1686 /* We must wait until mount directory is available */
1687 struct stat statbuf;
1689 while (stat(mp->mnt_dir, &statbuf) == -1) {
1691 daemonized = daemonize();
1692 if (daemonized <= 0) { /* parent or error */
1693 /* FIXME: parent doesn't close fsock - ??! */
1694 retval = -daemonized;
1698 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1705 /* Perform actual mount */
1707 retval = mount_it_now(mp, vfsflags, (char*)&data);
1714 auth_destroy(mclient->cl_auth);
1715 clnt_destroy(mclient);
1729 #else // !ENABLE_FEATURE_MOUNT_NFS
1731 /* Linux 2.6.23+ supports nfs mounts with options passed as a string.
1732 * For older kernels, you must build busybox with ENABLE_FEATURE_MOUNT_NFS.
1733 * (However, note that then you lose any chances that NFS over IPv6 would work).
1735 static int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
1737 len_and_sockaddr *lsa;
1743 # if ENABLE_FEATURE_IPV6
1744 end = strchr(mp->mnt_fsname, ']');
1745 if (end && end[1] == ':')
1749 /* mount_main() guarantees that ':' is there */
1750 end = strchr(mp->mnt_fsname, ':');
1753 lsa = xhost2sockaddr(mp->mnt_fsname, /*port:*/ 0);
1755 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1756 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1757 opts = xasprintf("%s%saddr=%s",
1758 filteropts ? filteropts : "",
1759 filteropts ? "," : "",
1762 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1763 ret = mount_it_now(mp, vfsflags, opts);
1764 if (ENABLE_FEATURE_CLEAN_UP) free(opts);
1769 #endif // !ENABLE_FEATURE_MOUNT_NFS
1771 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1772 // type detection. Returns 0 for success, nonzero for failure.
1773 // NB: mp->xxx fields may be trashed on exit
1774 static int singlemount(struct mntent *mp, int ignore_busy)
1777 unsigned long vfsflags;
1778 char *loopFile = NULL, *filteropts = NULL;
1784 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1786 // Treat fstype "auto" as unspecified
1787 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1788 mp->mnt_type = NULL;
1790 // Might this be a virtual filesystem?
1791 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1795 // fsname: "cmd#arg1#arg2..."
1796 // WARNING: allows execution of arbitrary commands!
1797 // Try "mount 'sh#-c#sh' bogus_dir".
1798 // It is safe ONLY because non-root
1799 // cannot use two-argument mount command
1800 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1801 // "mount: can't find sh#-c#sh in /etc/fstab"
1802 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1807 while (*s && n < 35 - 2) {
1808 if (*s++ == '#' && *s != '#') {
1813 args[n++] = mp->mnt_dir;
1815 rc = spawn_and_wait(args);
1819 // Might this be an CIFS filesystem?
1820 if (ENABLE_FEATURE_MOUNT_CIFS
1821 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1822 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1823 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1827 char *hostname, *share;
1829 len_and_sockaddr *lsa;
1831 // Parse mp->mnt_fsname of the form "//hostname/share[/dir1/dir2]"
1833 hostname = mp->mnt_fsname + 2;
1834 len = strcspn(hostname, "/\\");
1835 share = hostname + len + 1;
1836 if (len == 0 // 3rd char is a [back]slash (IOW: empty hostname)
1837 || share[-1] == '\0' // no [back]slash after hostname
1838 || share[0] == '\0' // empty share name
1844 len = strcspn(share, "/\\");
1846 // "unc=\\hostname\share" option is mandatory
1847 // after CIFS option parsing was rewritten in Linux 3.4.
1848 // Must use backslashes.
1849 // If /dir1/dir2 is present, also add "prefixpath=dir1/dir2"
1851 char *unc = xasprintf(
1852 share[len] != '\0' /* "/dir1/dir2" exists? */
1853 ? "unc=\\\\%s\\%.*s,prefixpath=%s"
1854 : "unc=\\\\%s\\%.*s",
1857 share + len + 1 /* "dir1/dir2" */
1859 parse_mount_options(unc, &filteropts);
1860 if (ENABLE_FEATURE_CLEAN_UP) free(unc);
1863 lsa = host2sockaddr(hostname, 0);
1868 // Insert "ip=..." option into options
1869 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1870 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1871 ip = xasprintf("ip=%s", dotted);
1872 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1873 parse_mount_options(ip, &filteropts);
1874 if (ENABLE_FEATURE_CLEAN_UP) free(ip);
1876 mp->mnt_type = (char*)"cifs";
1877 rc = mount_it_now(mp, vfsflags, filteropts);
1882 // Might this be an NFS filesystem?
1883 if ((!mp->mnt_type || strncmp(mp->mnt_type, "nfs", 3) == 0)
1884 && strchr(mp->mnt_fsname, ':') != NULL
1887 mp->mnt_type = (char*)"nfs";
1888 rc = nfsmount(mp, vfsflags, filteropts);
1892 // Look at the file. (Not found isn't a failure for remount, or for
1893 // a synthetic filesystem like proc or sysfs.)
1894 // (We use stat, not lstat, in order to allow
1895 // mount symlink_to_file_or_blkdev dir)
1896 if (!stat(mp->mnt_fsname, &st)
1897 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1899 // Do we need to allocate a loopback device for it?
1900 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1901 loopFile = bb_simplify_path(mp->mnt_fsname);
1902 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1903 if (set_loop(&mp->mnt_fsname, loopFile, 0, /*ro:*/ (vfsflags & MS_RDONLY)) < 0) {
1904 if (errno == EPERM || errno == EACCES)
1905 bb_error_msg(bb_msg_perm_denied_are_you_root);
1907 bb_perror_msg("can't setup loop device");
1911 // Autodetect bind mounts
1912 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1913 vfsflags |= MS_BIND;
1916 // If we know the fstype (or don't need to), jump straight
1917 // to the actual mount.
1918 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
1921 next = mp->mnt_type ? strchr(mp->mnt_type, ',') : NULL;
1924 rc = mount_it_now(mp, vfsflags, filteropts);
1925 if (rc == 0 || !next)
1927 mp->mnt_type = next + 1;
1930 // Loop through filesystem types until mount succeeds
1933 // Initialize list of block backed filesystems.
1934 // This has to be done here so that during "mount -a",
1935 // mounts after /proc shows up can autodetect.
1937 fslist = get_block_backed_filesystems();
1938 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1939 atexit(delete_block_backed_filesystems);
1942 for (fl = fslist; fl; fl = fl->link) {
1943 mp->mnt_type = fl->data;
1944 rc = mount_it_now(mp, vfsflags, filteropts);
1950 // If mount failed, clean up loop file (if any).
1951 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1952 del_loop(mp->mnt_fsname);
1953 if (ENABLE_FEATURE_CLEAN_UP) {
1955 free(mp->mnt_fsname);
1960 if (ENABLE_FEATURE_CLEAN_UP)
1963 if (errno == EBUSY && ignore_busy)
1966 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1971 // -O interprets a list of filter options which select whether a mount
1972 // point will be mounted: only mounts with options matching *all* filtering
1973 // options will be selected.
1974 // By default each -O filter option must be present in the list of mount
1975 // options, but if it is prefixed by "no" then it must be absent.
1977 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1978 // (and also fails to match -o a because -o c is absent).
1980 // It is different from -t in that each option is matched exactly; a leading
1981 // "no" at the beginning of one option does not negate the rest.
1982 static int match_opt(const char *fs_opt_in, const char *O_opt)
1988 const char *fs_opt = fs_opt_in;
1992 // If option begins with "no" then treat as an inverted match:
1993 // matching is a failure
1995 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1999 // Isolate the current O option
2000 O_len = strchrnul(O_opt, ',') - O_opt;
2001 // Check for a match against existing options
2003 if (strncmp(fs_opt, O_opt, O_len) == 0
2004 && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
2007 return 0; // "no" prefix, but option found
2008 match = 1; // current O option found, go check next one
2011 fs_opt = strchr(fs_opt, ',');
2017 return 0; // match wanted but not found
2018 if (O_opt[O_len] == '\0') // end?
2020 // Step to the next O option
2023 // If we get here then everything matched
2027 // Parse options, if necessary parse fstab/mtab, and call singlemount for
2028 // each directory to be mounted.
2029 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2030 int mount_main(int argc UNUSED_PARAM, char **argv)
2032 char *cmdopts = xzalloc(1);
2033 char *fstype = NULL;
2034 char *O_optmatch = NULL;
2036 llist_t *lst_o = NULL;
2037 const char *fstabname;
2040 int rc = EXIT_SUCCESS;
2041 unsigned long cmdopt_flags;
2043 struct mntent mtpair[2], *mtcur = mtpair;
2044 IF_NOT_DESKTOP(const int nonroot = 0;)
2046 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
2050 // Parse long options, like --bind and --move. Note that -o option
2051 // and --option are synonymous. Yes, this means --remount,rw works.
2052 for (i = j = 1; argv[i]; i++) {
2053 if (argv[i][0] == '-' && argv[i][1] == '-')
2054 append_mount_options(&cmdopts, argv[i] + 2);
2056 argv[j++] = argv[i];
2060 // Parse remaining options
2061 // Max 2 params; -o is a list, -v is a counter
2062 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
2063 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
2064 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
2065 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
2066 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
2067 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
2070 // If we have no arguments, show currently mounted filesystems
2072 if (!(opt & OPT_a)) {
2073 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
2076 bb_error_msg_and_die("no %s", bb_path_mtab_file);
2078 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
2081 // Don't show rootfs. FIXME: why??
2082 // util-linux 2.12a happily shows rootfs...
2083 //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
2085 if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
2086 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
2087 mtpair->mnt_dir, mtpair->mnt_type,
2090 if (ENABLE_FEATURE_CLEAN_UP)
2091 endmntent(mountTable);
2092 return EXIT_SUCCESS;
2094 storage_path = NULL;
2096 // When we have two arguments, the second is the directory and we can
2097 // skip looking at fstab entirely. We can always abspath() the directory
2098 // argument when we get it.
2101 bb_error_msg_and_die(bb_msg_you_must_be_root);
2102 mtpair->mnt_fsname = argv[0];
2103 mtpair->mnt_dir = argv[1];
2104 mtpair->mnt_type = fstype;
2105 mtpair->mnt_opts = cmdopts;
2106 resolve_mount_spec(&mtpair->mnt_fsname);
2107 rc = singlemount(mtpair, /*ignore_busy:*/ 0);
2110 storage_path = bb_simplify_path(argv[0]); // malloced
2113 // Past this point, we are handling either "mount -a [opts]"
2114 // or "mount [opts] single_param"
2116 cmdopt_flags = parse_mount_options(cmdopts, NULL);
2117 if (nonroot && (cmdopt_flags & ~MS_SILENT)) // Non-root users cannot specify flags
2118 bb_error_msg_and_die(bb_msg_you_must_be_root);
2120 // If we have a shared subtree flag, don't worry about fstab or mtab.
2121 if (ENABLE_FEATURE_MOUNT_FLAGS
2122 && (cmdopt_flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
2124 // verbose_mount(source, target, type, flags, data)
2125 rc = verbose_mount("", argv[0], "", cmdopt_flags, "");
2127 bb_simple_perror_msg_and_die(argv[0]);
2131 // Open either fstab or mtab
2132 fstabname = "/etc/fstab";
2133 if (cmdopt_flags & MS_REMOUNT) {
2134 // WARNING. I am not sure this matches util-linux's
2135 // behavior. It's possible util-linux does not
2136 // take -o opts from mtab (takes only mount source).
2137 fstabname = bb_path_mtab_file;
2139 fstab = setmntent(fstabname, "r");
2141 bb_perror_msg_and_die("can't read '%s'", fstabname);
2143 // Loop through entries until we find what we're looking for
2144 memset(mtpair, 0, sizeof(mtpair));
2146 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
2148 // Get next fstab entry
2149 if (!getmntent_r(fstab, mtcur, getmntent_buf
2150 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
2151 GETMNTENT_BUFSIZE/2)
2152 ) { // End of fstab/mtab is reached
2153 mtcur = mtother; // the thing we found last time
2157 // If we're trying to mount something specific and this isn't it,
2158 // skip it. Note we must match the exact text in fstab (ala
2159 // "proc") or a full path from root
2162 // Is this what we're looking for?
2163 if (strcmp(argv[0], mtcur->mnt_fsname) != 0
2164 && strcmp(storage_path, mtcur->mnt_fsname) != 0
2165 && strcmp(argv[0], mtcur->mnt_dir) != 0
2166 && strcmp(storage_path, mtcur->mnt_dir) != 0
2171 // Remember this entry. Something later may have
2172 // overmounted it, and we want the _last_ match.
2175 // If we're mounting all
2178 // No, mount -a won't mount anything,
2179 // even user mounts, for mere humans
2181 bb_error_msg_and_die(bb_msg_you_must_be_root);
2183 // Does type match? (NULL matches always)
2184 if (!match_fstype(mtcur, fstype))
2187 // Skip noauto and swap anyway
2188 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
2189 // swap is bogus "fstype", parse_mount_options can't check fstypes
2190 || strcasecmp(mtcur->mnt_type, "swap") == 0
2195 // Does (at least one) option match?
2196 // (NULL matches always)
2197 if (!match_opt(mtcur->mnt_opts, O_optmatch))
2200 resolve_mount_spec(&mtcur->mnt_fsname);
2202 // NFS mounts want this to be xrealloc-able
2203 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2205 // If nothing is mounted on this directory...
2206 // (otherwise repeated "mount -a" mounts everything again)
2207 mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2208 // We do not check fsname match of found mount point -
2209 // "/" may have fsname of "/dev/root" while fstab
2210 // says "/dev/something_else".
2213 bb_error_msg("according to %s, "
2214 "%s is already mounted on %s",
2216 mp->mnt_fsname, mp->mnt_dir);
2219 // ...mount this thing
2220 if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
2221 // Count number of failed mounts
2225 free(mtcur->mnt_opts);
2229 // End of fstab/mtab is reached.
2230 // Were we looking for something specific?
2231 if (argv[0]) { // yes
2234 // If we didn't find anything, complain
2235 if (!mtcur->mnt_fsname)
2236 bb_error_msg_and_die("can't find %s in %s",
2237 argv[0], fstabname);
2239 // What happens when we try to "mount swap_partition"?
2240 // (fstab containts "swap_partition swap swap defaults 0 0")
2241 // util-linux-ng 2.13.1 does this:
2242 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2243 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2244 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2245 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2246 // exit_group(32) = ?
2248 // In case we want to simply skip swap partitions:
2249 l = parse_mount_options(mtcur->mnt_opts, NULL);
2250 if ((l & MOUNT_SWAP)
2251 // swap is bogus "fstype", parse_mount_options can't check fstypes
2252 || strcasecmp(mtcur->mnt_type, "swap") == 0
2258 // fstab must have "users" or "user"
2259 l = parse_mount_options(mtcur->mnt_opts, NULL);
2260 if (!(l & MOUNT_USERS))
2261 bb_error_msg_and_die(bb_msg_you_must_be_root);
2264 //util-linux-2.12 does not do this check.
2265 //// If nothing is mounted on this directory...
2266 //// (otherwise repeated "mount FOO" mounts FOO again)
2267 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2269 // bb_error_msg("according to %s, "
2270 // "%s is already mounted on %s",
2271 // bb_path_mtab_file,
2272 // mp->mnt_fsname, mp->mnt_dir);
2274 // ...mount the last thing we found
2275 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2276 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2277 resolve_mount_spec(&mtpair->mnt_fsname);
2278 rc = singlemount(mtcur, /*ignore_busy:*/ 0);
2279 if (ENABLE_FEATURE_CLEAN_UP)
2280 free(mtcur->mnt_opts);
2285 if (ENABLE_FEATURE_CLEAN_UP)
2287 if (ENABLE_FEATURE_CLEAN_UP) {
2292 //TODO: exitcode should be ORed mask of (from "man mount"):
2294 // 1 incorrect invocation or permissions
2295 // 2 system error (out of memory, cannot fork, no more loop devices)
2296 // 4 internal mount bug or missing nfs support in mount
2298 //16 problems writing or locking /etc/mtab
2300 //64 some mount succeeded