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: "\n -r Read-only mount"
40 //usage: "\n -w Read-write mount (default)"
41 //usage: "\n -t FSTYPE Filesystem type"
42 //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)"
44 //usage: IF_FEATURE_MOUNT_LOOP(
45 //usage: "\n loop Ignored (loop devices are autodetected)"
47 //usage: IF_FEATURE_MOUNT_FLAGS(
48 //usage: "\n [a]sync Writes are [a]synchronous"
49 //usage: "\n [no]atime Disable/enable updates to inode access times"
50 //usage: "\n [no]diratime Disable/enable atime updates to directories"
51 //usage: "\n [no]relatime Disable/enable atime updates relative to modification time"
52 //usage: "\n [no]dev (Dis)allow use of special device files"
53 //usage: "\n [no]exec (Dis)allow use of executable files"
54 //usage: "\n [no]suid (Dis)allow set-user-id-root programs"
55 //usage: "\n [r]shared Convert [recursively] to a shared subtree"
56 //usage: "\n [r]slave Convert [recursively] to a slave subtree"
57 //usage: "\n [r]private Convert [recursively] to a private subtree"
58 //usage: "\n [un]bindable Make mount point [un]able to be bind mounted"
59 //usage: "\n [r]bind Bind a file or directory [recursively] to another location"
60 //usage: "\n move Relocate an existing mount point"
62 //usage: "\n remount Remount a mounted filesystem, changing flags"
63 //usage: "\n ro/rw Same as -r/-w"
65 //usage: "\nThere are filesystem-specific -o flags."
67 //usage:#define mount_example_usage
69 //usage: "/dev/hda3 on / type minix (rw)\n"
70 //usage: "proc on /proc type proc (rw)\n"
71 //usage: "devpts on /dev/pts type devpts (rw)\n"
72 //usage: "$ mount /dev/fd0 /mnt -t msdos -o ro\n"
73 //usage: "$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
74 //usage: "$ mount cd_image.iso mydir\n"
75 //usage:#define mount_notes_usage
76 //usage: "Returns 0 for success, number of failed mounts for -a, or errno for one mount."
80 #include <sys/mount.h>
81 // Grab more as needed from util-linux's mount/mount_constants.h
83 # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous
86 # define MS_UNION (1 << 8)
89 # define MS_BIND (1 << 12)
92 # define MS_MOVE (1 << 13)
95 # define MS_RECURSIVE (1 << 14)
98 # define MS_SILENT (1 << 15)
100 // The shared subtree stuff, which went in around 2.6.15
101 #ifndef MS_UNBINDABLE
102 # define MS_UNBINDABLE (1 << 17)
105 # define MS_PRIVATE (1 << 18)
108 # define MS_SLAVE (1 << 19)
111 # define MS_SHARED (1 << 20)
114 # define MS_RELATIME (1 << 21)
118 #if ENABLE_FEATURE_MOUNT_LABEL
119 # include "volume_id.h"
121 # define resolve_mount_spec(fsname) ((void)0)
124 // Needed for nfs support only
125 #include <sys/utsname.h>
128 #if ENABLE_FEATURE_MOUNT_NFS
129 /* This is just a warning of a common mistake. Possibly this should be a
130 * uclibc faq entry rather than in busybox... */
131 # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
132 # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
134 # include <rpc/rpc.h>
135 # include <rpc/pmap_prot.h>
136 # include <rpc/pmap_clnt.h>
140 #if defined(__dietlibc__)
141 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
142 // dietlibc-0.30 does not have implementation of getmntent_r()
143 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
144 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
146 struct mntent* ment = getmntent(stream);
147 return memcpy(result, ment, sizeof(*ment));
152 // Not real flags, but we want to be able to check for this.
154 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
155 MOUNT_NOAUTO = (1 << 29),
156 MOUNT_SWAP = (1 << 30),
160 #define OPTION_STR "o:t:rwanfvsiO:"
175 #if ENABLE_FEATURE_MTAB_SUPPORT
176 #define USE_MTAB (!(option_mask32 & OPT_n))
181 #if ENABLE_FEATURE_MOUNT_FAKE
182 #define FAKE_IT (option_mask32 & OPT_f)
187 #if ENABLE_FEATURE_MOUNT_HELPERS
188 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
190 #define HELPERS_ALLOWED 0
194 // TODO: more "user" flag compatibility.
195 // "user" option (from mount manpage):
196 // Only the user that mounted a filesystem can unmount it again.
197 // If any user should be able to unmount, then use users instead of user
198 // in the fstab line. The owner option is similar to the user option,
199 // with the restriction that the user must be the owner of the special file.
200 // This may be useful e.g. for /dev/fd if a login script makes
201 // the console user owner of this device.
203 // Standard mount options (from -o options or --options),
204 // with corresponding flags
205 static const int32_t mount_options[] = {
206 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
208 IF_FEATURE_MOUNT_LOOP(
212 IF_FEATURE_MOUNT_FSTAB(
214 /* "quiet" 0 - do not filter out, vfat wants to see it */
215 /* "noauto" */ MOUNT_NOAUTO,
216 /* "sw" */ MOUNT_SWAP,
217 /* "swap" */ MOUNT_SWAP,
218 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
219 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
223 IF_FEATURE_MOUNT_FLAGS(
225 /* "nosuid" */ MS_NOSUID,
226 /* "suid" */ ~MS_NOSUID,
227 /* "dev" */ ~MS_NODEV,
228 /* "nodev" */ MS_NODEV,
229 /* "exec" */ ~MS_NOEXEC,
230 /* "noexec" */ MS_NOEXEC,
231 /* "sync" */ MS_SYNCHRONOUS,
232 /* "dirsync" */ MS_DIRSYNC,
233 /* "async" */ ~MS_SYNCHRONOUS,
234 /* "atime" */ ~MS_NOATIME,
235 /* "noatime" */ MS_NOATIME,
236 /* "diratime" */ ~MS_NODIRATIME,
237 /* "nodiratime" */ MS_NODIRATIME,
238 /* "mand" */ MS_MANDLOCK,
239 /* "nomand" */ ~MS_MANDLOCK,
240 /* "relatime" */ MS_RELATIME,
241 /* "norelatime" */ ~MS_RELATIME,
242 /* "loud" */ ~MS_SILENT,
243 /* "rbind" */ MS_BIND|MS_RECURSIVE,
246 /* "union" */ MS_UNION,
247 /* "bind" */ MS_BIND,
248 /* "move" */ MS_MOVE,
249 /* "shared" */ MS_SHARED,
250 /* "slave" */ MS_SLAVE,
251 /* "private" */ MS_PRIVATE,
252 /* "unbindable" */ MS_UNBINDABLE,
253 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
254 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
255 /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE,
256 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
259 // Always understood.
260 /* "ro" */ MS_RDONLY, // vfs flag
261 /* "rw" */ ~MS_RDONLY, // vfs flag
262 /* "remount" */ MS_REMOUNT // action flag
265 static const char mount_option_str[] =
266 IF_FEATURE_MOUNT_LOOP(
269 IF_FEATURE_MOUNT_FSTAB(
271 // "quiet\0" - do not filter out, vfat wants to see it
276 IF_DESKTOP("users\0")
279 IF_FEATURE_MOUNT_FLAGS(
315 // Always understood.
318 "remount\0" // action flag
323 #if ENABLE_FEATURE_MOUNT_NFS
324 smalluint nfs_mount_version;
326 #if ENABLE_FEATURE_MOUNT_VERBOSE
330 char getmntent_buf[1];
332 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
333 #define G (*(struct globals*)&bb_common_bufsiz1)
334 #define nfs_mount_version (G.nfs_mount_version)
335 #if ENABLE_FEATURE_MOUNT_VERBOSE
336 #define verbose (G.verbose )
340 #define fslist (G.fslist )
341 #define getmntent_buf (G.getmntent_buf )
343 #if ENABLE_FEATURE_MTAB_SUPPORT
345 * update_mtab_entry_on_move() is used to update entry in case of mount --move.
346 * we are looking for existing entries mnt_dir which is equal to mnt_fsname of
347 * input mntent and replace it by new one.
349 static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp)
351 struct mntent *entries, *m;
355 mountTable = setmntent(bb_path_mtab_file, "r");
357 bb_perror_msg(bb_path_mtab_file);
363 while ((m = getmntent(mountTable)) != NULL) {
364 entries = xrealloc_vector(entries, 3, count);
365 entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
366 entries[count].mnt_dir = xstrdup(m->mnt_dir);
367 entries[count].mnt_type = xstrdup(m->mnt_type);
368 entries[count].mnt_opts = xstrdup(m->mnt_opts);
369 entries[count].mnt_freq = m->mnt_freq;
370 entries[count].mnt_passno = m->mnt_passno;
373 endmntent(mountTable);
375 mountTable = setmntent(bb_path_mtab_file, "w");
377 for (i = 0; i < count; i++) {
378 if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0)
379 addmntent(mountTable, &entries[i]);
381 addmntent(mountTable, mp);
383 endmntent(mountTable);
384 } else if (errno != EROFS)
385 bb_perror_msg(bb_path_mtab_file);
387 if (ENABLE_FEATURE_CLEAN_UP) {
388 for (i = 0; i < count; i++) {
389 free(entries[i].mnt_fsname);
390 free(entries[i].mnt_dir);
391 free(entries[i].mnt_type);
392 free(entries[i].mnt_opts);
399 #if ENABLE_FEATURE_MOUNT_VERBOSE
400 static int verbose_mount(const char *source, const char *target,
401 const char *filesystemtype,
402 unsigned long mountflags, const void *data)
407 rc = mount(source, target, filesystemtype, mountflags, data);
409 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
410 source, target, filesystemtype,
411 mountflags, (char*)data, rc);
415 #define verbose_mount(...) mount(__VA_ARGS__)
418 // Append mount options to string
419 static void append_mount_options(char **oldopts, const char *newopts)
421 if (*oldopts && **oldopts) {
422 // Do not insert options which are already there
425 int len = strlen(newopts);
426 p = strchr(newopts, ',');
427 if (p) len = p - newopts;
430 if (!strncmp(p, newopts, len)
431 && (p[len] == ',' || p[len] == '\0'))
437 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
442 while (newopts[0] == ',') newopts++;
445 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
446 *oldopts = xstrdup(newopts);
450 // Use the mount_options list to parse options into flags.
451 // Also update list of unrecognized options if unrecognized != NULL
452 static long parse_mount_options(char *options, char **unrecognized)
454 long flags = MS_SILENT;
456 // Loop through options
459 char *comma = strchr(options, ',');
460 const char *option_str = mount_option_str;
462 if (comma) *comma = '\0';
464 // FIXME: use hasmntopt()
465 // Find this option in mount_options
466 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
467 if (strcasecmp(option_str, options) == 0) {
468 long fl = mount_options[i];
475 option_str += strlen(option_str) + 1;
477 // We did not recognize this option.
478 // If "unrecognized" is not NULL, append option there.
479 // Note that we should not append *empty* option -
480 // in this case we want to pass NULL, not "", to "data"
481 // parameter of mount(2) syscall.
482 // This is crucial for filesystems that don't accept
483 // any arbitrary mount options, like cgroup fs:
484 // "mount -t cgroup none /mnt"
485 if (options[0] && unrecognized) {
486 // Add it to strflags, to pass on to kernel
487 char *p = *unrecognized;
488 unsigned len = p ? strlen(p) : 0;
489 *unrecognized = p = xrealloc(p, len + strlen(options) + 2);
491 // Comma separated if it's not the first one
492 if (len) p[len++] = ',';
493 strcpy(p + len, options);
498 // Advance to next option
506 // Return a list of all block device backed filesystems
507 static llist_t *get_block_backed_filesystems(void)
509 static const char filesystems[2][sizeof("/proc/filesystems")] = {
514 llist_t *list = NULL;
518 for (i = 0; i < 2; i++) {
519 f = fopen_for_read(filesystems[i]);
522 while ((buf = xmalloc_fgetline(f)) != NULL) {
523 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
525 fs = skip_whitespace(buf);
526 if (*fs == '#' || *fs == '*' || !*fs)
529 llist_add_to_end(&list, xstrdup(fs));
532 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
538 #if ENABLE_FEATURE_CLEAN_UP
539 static void delete_block_backed_filesystems(void)
541 llist_free(fslist, free);
544 void delete_block_backed_filesystems(void);
547 // Perform actual mount of specific filesystem at specific location.
548 // NB: mp->xxx fields may be trashed on exit
549 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
555 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
556 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
557 vfsflags, filteropts);
561 // Mount, with fallback to read-only if necessary.
564 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
565 vfsflags, filteropts);
567 // If mount failed, try
568 // helper program mount.<mnt_type>
569 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
571 int errno_save = errno;
572 args[0] = xasprintf("mount.%s", mp->mnt_type);
575 args[rc++] = (char *)"-f";
576 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
577 args[rc++] = (char *)"-n";
578 args[rc++] = mp->mnt_fsname;
579 args[rc++] = mp->mnt_dir;
581 args[rc++] = (char *)"-o";
582 args[rc++] = filteropts;
585 rc = spawn_and_wait(args);
592 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
594 if (!(vfsflags & MS_SILENT))
595 bb_error_msg("%s is write-protected, mounting read-only",
597 vfsflags |= MS_RDONLY;
600 // Abort entirely if permission denied.
602 if (rc && errno == EPERM)
603 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
605 // If the mount was successful, and we're maintaining an old-style
606 // mtab file by hand, add the new entry to it now.
608 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
610 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
611 const char *option_str = mount_option_str;
615 bb_perror_msg(bb_path_mtab_file);
619 // Add vfs string flags
620 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
621 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
622 append_mount_options(&(mp->mnt_opts), option_str);
623 option_str += strlen(option_str) + 1;
626 // Remove trailing / (if any) from directory we mounted on
627 i = strlen(mp->mnt_dir) - 1;
628 while (i > 0 && mp->mnt_dir[i] == '/')
629 mp->mnt_dir[i--] = '\0';
631 // Convert to canonical pathnames as needed
632 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
634 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
635 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
636 mp->mnt_type = (char*)"bind";
638 mp->mnt_freq = mp->mnt_passno = 0;
641 #if ENABLE_FEATURE_MTAB_SUPPORT
642 if (vfsflags & MS_MOVE)
643 update_mtab_entry_on_move(mp);
646 addmntent(mountTable, mp);
647 endmntent(mountTable);
649 if (ENABLE_FEATURE_CLEAN_UP) {
658 #if ENABLE_FEATURE_MOUNT_NFS
662 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
664 * Licensed under GPLv2, see file LICENSE in this source tree.
666 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
667 * numbers to be specified on the command line.
669 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
670 * Omit the call to connect() for Linux version 1.3.11 or later.
672 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
673 * Implemented the "bg", "fg" and "retry" mount options for NFS.
675 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
676 * - added Native Language Support
678 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
682 #define MOUNTPORT 635
683 #define MNTPATHLEN 1024
684 #define MNTNAMLEN 255
688 typedef char fhandle[FHSIZE];
691 unsigned int fhandle3_len;
703 MNT3ERR_NAMETOOLONG = 63,
704 MNT3ERR_NOTSUPP = 10004,
705 MNT3ERR_SERVERFAULT = 10006,
707 typedef enum mountstat3 mountstat3;
710 unsigned int fhs_status;
715 typedef struct fhstatus fhstatus;
717 struct mountres3_ok {
720 unsigned int auth_flavours_len;
721 char *auth_flavours_val;
724 typedef struct mountres3_ok mountres3_ok;
727 mountstat3 fhs_status;
729 mountres3_ok mountinfo;
732 typedef struct mountres3 mountres3;
734 typedef char *dirpath;
738 typedef struct mountbody *mountlist;
742 dirpath ml_directory;
745 typedef struct mountbody mountbody;
747 typedef struct groupnode *groups;
753 typedef struct groupnode groupnode;
755 typedef struct exportnode *exports;
762 typedef struct exportnode exportnode;
775 typedef struct ppathcnf ppathcnf;
777 #define MOUNTPROG 100005
780 #define MOUNTPROC_NULL 0
781 #define MOUNTPROC_MNT 1
782 #define MOUNTPROC_DUMP 2
783 #define MOUNTPROC_UMNT 3
784 #define MOUNTPROC_UMNTALL 4
785 #define MOUNTPROC_EXPORT 5
786 #define MOUNTPROC_EXPORTALL 6
788 #define MOUNTVERS_POSIX 2
790 #define MOUNTPROC_PATHCONF 7
794 #define MOUNTPROC3_NULL 0
795 #define MOUNTPROC3_MNT 1
796 #define MOUNTPROC3_DUMP 2
797 #define MOUNTPROC3_UMNT 3
798 #define MOUNTPROC3_UMNTALL 4
799 #define MOUNTPROC3_EXPORT 5
811 * We want to be able to compile mount on old kernels in such a way
812 * that the binary will work well on more recent kernels.
813 * Thus, if necessary we teach nfsmount.c the structure of new fields
814 * that will come later.
816 * Moreover, the new kernel includes conflict with glibc includes
817 * so it is easiest to ignore the kernel altogether (at compile time).
825 unsigned char data[64];
828 struct nfs_mount_data {
831 struct nfs2_fh old_root; /* 1 */
837 int acregmin; /* 1 */
838 int acregmax; /* 1 */
839 int acdirmin; /* 1 */
840 int acdirmax; /* 1 */
841 struct sockaddr_in addr; /* 1 */
842 char hostname[256]; /* 1 */
844 unsigned int bsize; /* 3 */
845 struct nfs3_fh root; /* 4 */
848 /* bits in the flags field */
850 NFS_MOUNT_SOFT = 0x0001, /* 1 */
851 NFS_MOUNT_INTR = 0x0002, /* 1 */
852 NFS_MOUNT_SECURE = 0x0004, /* 1 */
853 NFS_MOUNT_POSIX = 0x0008, /* 1 */
854 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
855 NFS_MOUNT_NOAC = 0x0020, /* 1 */
856 NFS_MOUNT_TCP = 0x0040, /* 2 */
857 NFS_MOUNT_VER3 = 0x0080, /* 3 */
858 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
859 NFS_MOUNT_NONLM = 0x0200, /* 3 */
860 NFS_MOUNT_NORDIRPLUS = 0x4000
865 * We need to translate between nfs status return values and
866 * the local errno values which may not be the same.
868 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
869 * "after #include <errno.h> the symbol errno is reserved for any use,
870 * it cannot even be used as a struct tag or field name".
873 # define EDQUOT ENOSPC
875 /* Convert each NFSERR_BLAH into EBLAH */
876 static const uint8_t nfs_err_stat[] = {
878 19, 20, 21, 22, 27, 28,
879 30, 63, 66, 69, 70, 71
882 EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \
883 ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \
884 EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256
885 typedef uint8_t nfs_err_type;
887 typedef uint16_t nfs_err_type;
889 static const nfs_err_type nfs_err_errnum[] = {
890 EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
891 ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
892 EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
894 static char *nfs_strerror(int status)
898 for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
899 if (nfs_err_stat[i] == status)
900 return strerror(nfs_err_errnum[i]);
902 return xasprintf("unknown nfs status return value: %d", status);
905 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
907 return xdr_opaque(xdrs, objp, FHSIZE);
910 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
912 if (!xdr_u_int(xdrs, &objp->fhs_status))
914 if (objp->fhs_status == 0)
915 return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle);
919 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
921 return xdr_string(xdrs, objp, MNTPATHLEN);
924 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
926 return xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
927 (unsigned int *) &objp->fhandle3_len,
931 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
933 if (!xdr_fhandle3(xdrs, &objp->fhandle))
935 return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
936 &(objp->auth_flavours.auth_flavours_len),
939 (xdrproc_t) xdr_int);
942 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
944 return xdr_enum(xdrs, (enum_t *) objp);
947 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
949 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
951 if (objp->fhs_status == MNT_OK)
952 return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo);
956 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
959 * Unfortunately, the kernel prints annoying console messages
960 * in case of an unexpected nfs mount version (instead of
961 * just returning some error). Therefore we'll have to try
962 * and figure out what version the kernel expects.
965 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
966 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
967 * nfs_mount_version: version this source and running kernel can handle
970 find_kernel_nfs_mount_version(void)
974 if (nfs_mount_version)
977 nfs_mount_version = 4; /* default */
979 kernel_version = get_linux_version_code();
980 if (kernel_version) {
981 if (kernel_version < KERNEL_VERSION(2,2,18))
982 nfs_mount_version = 3;
983 /* else v4 since 2.3.99pre4 */
988 get_mountport(struct pmap *pm_mnt,
989 struct sockaddr_in *server_addr,
991 long unsigned version,
995 struct pmaplist *pmap;
997 server_addr->sin_port = PMAPPORT;
998 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
999 * I understand it like "IPv6 for this is not 100% ready" */
1000 pmap = pmap_getmaps(server_addr);
1002 if (version > MAX_NFSPROT)
1003 version = MAX_NFSPROT;
1006 pm_mnt->pm_prog = prog;
1007 pm_mnt->pm_vers = version;
1008 pm_mnt->pm_prot = proto;
1009 pm_mnt->pm_port = port;
1012 if (pmap->pml_map.pm_prog != prog)
1014 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
1016 if (version > 2 && pmap->pml_map.pm_vers != version)
1018 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
1020 if (pmap->pml_map.pm_vers > MAX_NFSPROT
1021 || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
1022 || (port && pmap->pml_map.pm_port != port)
1026 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
1028 pmap = pmap->pml_next;
1030 if (!pm_mnt->pm_vers)
1031 pm_mnt->pm_vers = MOUNTVERS;
1032 if (!pm_mnt->pm_port)
1033 pm_mnt->pm_port = MOUNTPORT;
1034 if (!pm_mnt->pm_prot)
1035 pm_mnt->pm_prot = IPPROTO_TCP;
1039 static int daemonize(void)
1042 if (pid < 0) /* error */
1044 if (pid > 0) /* parent */
1048 xopen(bb_dev_null, O_RDWR);
1052 openlog(applet_name, LOG_PID, LOG_DAEMON);
1053 logmode = LOGMODE_SYSLOG;
1057 static inline int daemonize(void) { return -ENOSYS; }
1061 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
1066 /* RPC strerror analogs are terminally idiotic:
1067 * *mandatory* prefix and \n at end.
1068 * This hopefully helps. Usage:
1069 * error_msg_rpc(clnt_*error*(" ")) */
1070 static void error_msg_rpc(const char *msg)
1073 while (msg[0] == ' ' || msg[0] == ':') msg++;
1075 while (len && msg[len-1] == '\n') len--;
1076 bb_error_msg("%.*s", len, msg);
1079 /* NB: mp->xxx fields may be trashed on exit */
1080 static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
1086 /* prior to 2.6.23, kernel took NFS options in a form of this struct
1087 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
1088 * then data pointer is interpreted as a string. */
1089 struct nfs_mount_data data;
1092 struct sockaddr_in server_addr;
1093 struct sockaddr_in mount_server_addr;
1096 struct fhstatus nfsv2;
1097 struct mountres3 nfsv3;
1115 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1125 find_kernel_nfs_mount_version();
1133 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1135 filteropts = xstrdup(filteropts); /* going to trash it later... */
1137 hostname = xstrdup(mp->mnt_fsname);
1138 /* mount_main() guarantees that ':' is there */
1139 s = strchr(hostname, ':');
1142 /* Ignore all but first hostname in replicated mounts
1143 until they can be fully supported. (mack@sgi.com) */
1144 s = strchr(hostname, ',');
1147 bb_error_msg("warning: multiple hostnames not supported");
1150 server_addr.sin_family = AF_INET;
1151 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1152 hp = gethostbyname(hostname);
1154 bb_herror_msg("%s", hostname);
1157 if (hp->h_length != (int)sizeof(struct in_addr)) {
1158 bb_error_msg_and_die("only IPv4 is supported");
1160 memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1163 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1165 /* add IP address to mtab options for use when unmounting */
1167 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1168 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1170 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1171 mp->mnt_opts[0] ? "," : "",
1172 inet_ntoa(server_addr.sin_addr));
1177 /* Set default options.
1178 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1179 * let the kernel decide.
1180 * timeo is filled in after we know whether it'll be TCP or UDP. */
1181 memset(&data, 0, sizeof(data));
1187 data.namlen = NAME_MAX;
1196 retry = 10000; /* 10000 minutes ~ 1 week */
1197 tcp = 1; /* nfs-utils uses tcp per default */
1199 mountprog = MOUNTPROG;
1207 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1208 char *opteq = strchr(opt, '=');
1211 static const char options[] ALIGN1 =
1216 /* 4 */ "acregmin\0"
1217 /* 5 */ "acregmax\0"
1218 /* 6 */ "acdirmin\0"
1219 /* 7 */ "acdirmax\0"
1223 /* 11 */ "mountport\0"
1224 /* 12 */ "mounthost\0"
1225 /* 13 */ "mountprog\0"
1226 /* 14 */ "mountvers\0"
1227 /* 15 */ "nfsprog\0"
1228 /* 16 */ "nfsvers\0"
1235 idx = index_in_strings(options, opt);
1237 case 12: // "mounthost"
1238 mounthost = xstrndup(opteq,
1239 strcspn(opteq, " \t\n\r,"));
1242 if (!strncmp(opteq, "tcp", 3))
1244 else if (!strncmp(opteq, "udp", 3))
1247 bb_error_msg("warning: unrecognized proto= option");
1249 case 20: // "addr" - ignore
1252 if (vfsflags & MS_REMOUNT)
1256 val = xatoi_positive(opteq);
1267 case 3: // "retrans"
1270 case 4: // "acregmin"
1271 data.acregmin = val;
1273 case 5: // "acregmax"
1274 data.acregmax = val;
1276 case 6: // "acdirmin"
1277 data.acdirmin = val;
1279 case 7: // "acdirmax"
1280 data.acdirmax = val;
1282 case 8: // "actimeo"
1283 data.acregmin = val;
1284 data.acregmax = val;
1285 data.acdirmin = val;
1286 data.acdirmax = val;
1294 case 11: // "mountport"
1297 case 13: // "mountprog"
1300 case 14: // "mountvers"
1303 case 15: // "nfsprog"
1306 case 16: // "nfsvers"
1310 case 19: // "namlen"
1311 //if (nfs_mount_version >= 2)
1314 // bb_error_msg("warning: option namlen is not supported\n");
1317 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1321 else { /* not of the form opt=val */
1322 static const char options[] ALIGN1 =
1336 if (!strncmp(opt, "no", 2)) {
1340 switch (index_in_strings(options, opt)) {
1376 if (nfs_mount_version >= 3)
1379 bb_error_msg("warning: option nolock is not supported");
1385 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1390 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1392 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1393 | (intr ? NFS_MOUNT_INTR : 0)
1394 | (posix ? NFS_MOUNT_POSIX : 0)
1395 | (nocto ? NFS_MOUNT_NOCTO : 0)
1396 | (noac ? NFS_MOUNT_NOAC : 0)
1397 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0);
1398 if (nfs_mount_version >= 2)
1399 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1400 if (nfs_mount_version >= 3)
1401 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1402 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1403 bb_error_msg("NFSv%d not supported", nfsvers);
1406 if (nfsvers && !mountvers)
1407 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1408 if (nfsvers && nfsvers < mountvers) {
1409 mountvers = nfsvers;
1412 /* Adjust options if none specified */
1414 data.timeo = tcp ? 70 : 7;
1416 data.version = nfs_mount_version;
1418 if (vfsflags & MS_REMOUNT)
1422 * If the previous mount operation on the same host was
1423 * backgrounded, and the "bg" for this mount is also set,
1424 * give up immediately, to avoid the initial timeout.
1426 if (bg && we_saw_this_host_before(hostname)) {
1427 daemonized = daemonize();
1428 if (daemonized <= 0) { /* parent or error */
1429 retval = -daemonized;
1434 /* Create mount daemon client */
1435 /* See if the nfs host = mount host. */
1437 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1438 mount_server_addr.sin_family = AF_INET;
1439 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1441 hp = gethostbyname(mounthost);
1443 bb_herror_msg("%s", mounthost);
1446 if (hp->h_length != (int)sizeof(struct in_addr)) {
1447 bb_error_msg_and_die("only IPv4 is supported");
1449 mount_server_addr.sin_family = AF_INET;
1450 memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1455 * The following loop implements the mount retries. When the mount
1456 * times out, and the "bg" option is set, we background ourself
1457 * and continue trying.
1459 * The case where the mount point is not present and the "bg"
1460 * option is set, is treated as a timeout. This is done to
1461 * support nested mounts.
1463 * The "retry" count specified by the user is the number of
1464 * minutes to retry before giving up.
1467 struct timeval total_timeout;
1468 struct timeval retry_timeout;
1474 retry_timeout.tv_sec = 3;
1475 retry_timeout.tv_usec = 0;
1476 total_timeout.tv_sec = 20;
1477 total_timeout.tv_usec = 0;
1478 /* FIXME: use monotonic()? */
1479 timeout = time(NULL) + 60 * retry;
1483 /* Be careful not to use too many CPU cycles */
1487 get_mountport(&pm_mnt, &mount_server_addr,
1492 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1494 /* contact the mount daemon via TCP */
1495 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1496 msock = RPC_ANYSOCK;
1498 switch (pm_mnt.pm_prot) {
1500 mclient = clntudp_create(&mount_server_addr,
1507 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1508 msock = RPC_ANYSOCK;
1510 mclient = clnttcp_create(&mount_server_addr,
1519 if (!daemonized && prevt == 0)
1520 error_msg_rpc(clnt_spcreateerror(" "));
1522 enum clnt_stat clnt_stat;
1524 /* Try to mount hostname:pathname */
1525 mclient->cl_auth = authunix_create_default();
1527 /* Make pointers in xdr_mountres3 NULL so
1528 * that xdr_array allocates memory for us
1530 memset(&status, 0, sizeof(status));
1532 if (pm_mnt.pm_vers == 3)
1533 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1534 (xdrproc_t) xdr_dirpath,
1535 (caddr_t) &pathname,
1536 (xdrproc_t) xdr_mountres3,
1540 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1541 (xdrproc_t) xdr_dirpath,
1542 (caddr_t) &pathname,
1543 (xdrproc_t) xdr_fhstatus,
1547 if (clnt_stat == RPC_SUCCESS)
1548 goto prepare_kernel_data; /* we're done */
1549 if (errno != ECONNREFUSED) {
1550 error_msg_rpc(clnt_sperror(mclient, " "));
1551 goto fail; /* don't retry */
1553 /* Connection refused */
1554 if (!daemonized && prevt == 0) /* print just once */
1555 error_msg_rpc(clnt_sperror(mclient, " "));
1556 auth_destroy(mclient->cl_auth);
1557 clnt_destroy(mclient);
1563 /* Timeout. We are going to retry... maybe */
1567 daemonized = daemonize();
1568 if (daemonized <= 0) { /* parent or error */
1569 retval = -daemonized;
1576 /* TODO error message */
1582 prepare_kernel_data:
1585 if (status.nfsv2.fhs_status != 0) {
1586 bb_error_msg("%s:%s failed, reason given by server: %s",
1588 nfs_strerror(status.nfsv2.fhs_status));
1591 memcpy(data.root.data,
1592 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1594 data.root.size = NFS_FHSIZE;
1595 memcpy(data.old_root.data,
1596 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1599 fhandle3 *my_fhandle;
1600 if (status.nfsv3.fhs_status != 0) {
1601 bb_error_msg("%s:%s failed, reason given by server: %s",
1603 nfs_strerror(status.nfsv3.fhs_status));
1606 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1607 memset(data.old_root.data, 0, NFS_FHSIZE);
1608 memset(&data.root, 0, sizeof(data.root));
1609 data.root.size = my_fhandle->fhandle3_len;
1610 memcpy(data.root.data,
1611 (char *) my_fhandle->fhandle3_val,
1612 my_fhandle->fhandle3_len);
1614 data.flags |= NFS_MOUNT_VER3;
1617 /* Create nfs socket for kernel */
1619 if (nfs_mount_version < 3) {
1620 bb_error_msg("NFS over TCP is not supported");
1623 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1625 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1627 bb_perror_msg("nfs socket");
1630 if (bindresvport(fsock, 0) < 0) {
1631 bb_perror_msg("nfs bindresvport");
1635 server_addr.sin_port = PMAPPORT;
1636 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1637 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1641 server_addr.sin_port = htons(port);
1643 /* Prepare data structure for kernel */
1645 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1646 strncpy(data.hostname, hostname, sizeof(data.hostname));
1649 auth_destroy(mclient->cl_auth);
1650 clnt_destroy(mclient);
1655 /* We must wait until mount directory is available */
1656 struct stat statbuf;
1658 while (stat(mp->mnt_dir, &statbuf) == -1) {
1660 daemonized = daemonize();
1661 if (daemonized <= 0) { /* parent or error */
1662 /* FIXME: parent doesn't close fsock - ??! */
1663 retval = -daemonized;
1667 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1674 /* Perform actual mount */
1676 mp->mnt_type = (char*)"nfs";
1677 retval = mount_it_now(mp, vfsflags, (char*)&data);
1684 auth_destroy(mclient->cl_auth);
1685 clnt_destroy(mclient);
1699 #else // !ENABLE_FEATURE_MOUNT_NFS
1701 // Never called. Call should be optimized out.
1702 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1704 #endif // !ENABLE_FEATURE_MOUNT_NFS
1706 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1707 // type detection. Returns 0 for success, nonzero for failure.
1708 // NB: mp->xxx fields may be trashed on exit
1709 static int singlemount(struct mntent *mp, int ignore_busy)
1713 char *loopFile = NULL, *filteropts = NULL;
1719 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1721 // Treat fstype "auto" as unspecified
1722 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1723 mp->mnt_type = NULL;
1725 // Might this be a virtual filesystem?
1726 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1730 // fsname: "cmd#arg1#arg2..."
1731 // WARNING: allows execution of arbitrary commands!
1732 // Try "mount 'sh#-c#sh' bogus_dir".
1733 // It is safe ONLY because non-root
1734 // cannot use two-argument mount command
1735 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1736 // "mount: can't find sh#-c#sh in /etc/fstab"
1737 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1742 while (*s && n < 35 - 2) {
1743 if (*s++ == '#' && *s != '#') {
1748 args[n++] = mp->mnt_dir;
1750 rc = spawn_and_wait(args);
1754 // Might this be an CIFS filesystem?
1755 if (ENABLE_FEATURE_MOUNT_CIFS
1756 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1757 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1758 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1762 len_and_sockaddr *lsa;
1763 char *hostname, *dotted, *ip;
1765 hostname = mp->mnt_fsname + 2;
1766 len = strcspn(hostname, "/\\");
1767 if (len == 0 || hostname[len] == '\0')
1770 hostname[len] = '\0';
1771 lsa = host2sockaddr(hostname, 0);
1776 // Insert "ip=..." option into options
1777 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1778 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1779 ip = xasprintf("ip=%s", dotted);
1780 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1781 parse_mount_options(ip, &filteropts);
1782 if (ENABLE_FEATURE_CLEAN_UP) free(ip);
1784 // "-o mand" is required [why?]
1785 vfsflags |= MS_MANDLOCK;
1786 mp->mnt_type = (char*)"cifs";
1787 rc = mount_it_now(mp, vfsflags, filteropts);
1792 // Might this be an NFS filesystem?
1793 if (ENABLE_FEATURE_MOUNT_NFS
1794 && (!mp->mnt_type || strcmp(mp->mnt_type, "nfs") == 0)
1795 && strchr(mp->mnt_fsname, ':') != NULL
1797 rc = nfsmount(mp, vfsflags, filteropts);
1801 // Look at the file. (Not found isn't a failure for remount, or for
1802 // a synthetic filesystem like proc or sysfs.)
1803 // (We use stat, not lstat, in order to allow
1804 // mount symlink_to_file_or_blkdev dir)
1805 if (!stat(mp->mnt_fsname, &st)
1806 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1808 // Do we need to allocate a loopback device for it?
1809 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1810 loopFile = bb_simplify_path(mp->mnt_fsname);
1811 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1812 if (set_loop(&mp->mnt_fsname, loopFile, 0) < 0) {
1813 if (errno == EPERM || errno == EACCES)
1814 bb_error_msg(bb_msg_perm_denied_are_you_root);
1816 bb_perror_msg("can't setup loop device");
1820 // Autodetect bind mounts
1821 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1822 vfsflags |= MS_BIND;
1825 // If we know the fstype (or don't need to), jump straight
1826 // to the actual mount.
1827 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
1828 rc = mount_it_now(mp, vfsflags, filteropts);
1830 // Loop through filesystem types until mount succeeds
1833 // Initialize list of block backed filesystems.
1834 // This has to be done here so that during "mount -a",
1835 // mounts after /proc shows up can autodetect.
1837 fslist = get_block_backed_filesystems();
1838 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1839 atexit(delete_block_backed_filesystems);
1842 for (fl = fslist; fl; fl = fl->link) {
1843 mp->mnt_type = fl->data;
1844 rc = mount_it_now(mp, vfsflags, filteropts);
1850 // If mount failed, clean up loop file (if any).
1851 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1852 del_loop(mp->mnt_fsname);
1853 if (ENABLE_FEATURE_CLEAN_UP) {
1855 free(mp->mnt_fsname);
1860 if (ENABLE_FEATURE_CLEAN_UP)
1863 if (errno == EBUSY && ignore_busy)
1866 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1871 // -O interprets a list of filter options which select whether a mount
1872 // point will be mounted: only mounts with options matching *all* filtering
1873 // options will be selected.
1874 // By default each -O filter option must be present in the list of mount
1875 // options, but if it is prefixed by "no" then it must be absent.
1877 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1878 // (and also fails to match -o a because -o c is absent).
1880 // It is different from -t in that each option is matched exactly; a leading
1881 // "no" at the beginning of one option does not negate the rest.
1882 static int match_opt(const char *fs_opt_in, const char *O_opt)
1888 const char *fs_opt = fs_opt_in;
1892 // If option begins with "no" then treat as an inverted match:
1893 // matching is a failure
1895 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1899 // Isolate the current O option
1900 O_len = strchrnul(O_opt, ',') - O_opt;
1901 // Check for a match against existing options
1903 if (strncmp(fs_opt, O_opt, O_len) == 0
1904 && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
1907 return 0; // "no" prefix, but option found
1908 match = 1; // current O option found, go check next one
1911 fs_opt = strchr(fs_opt, ',');
1917 return 0; // match wanted but not found
1918 if (O_opt[O_len] == '\0') // end?
1920 // Step to the next O option
1923 // If we get here then everything matched
1927 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1928 // each directory to be mounted.
1929 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1930 int mount_main(int argc UNUSED_PARAM, char **argv)
1932 char *cmdopts = xzalloc(1);
1933 char *fstype = NULL;
1934 char *O_optmatch = NULL;
1936 llist_t *lst_o = NULL;
1937 const char *fstabname;
1940 int rc = EXIT_SUCCESS;
1942 struct mntent mtpair[2], *mtcur = mtpair;
1943 IF_NOT_DESKTOP(const int nonroot = 0;)
1945 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
1947 // Parse long options, like --bind and --move. Note that -o option
1948 // and --option are synonymous. Yes, this means --remount,rw works.
1949 for (i = j = 1; argv[i]; i++) {
1950 if (argv[i][0] == '-' && argv[i][1] == '-')
1951 append_mount_options(&cmdopts, argv[i] + 2);
1953 argv[j++] = argv[i];
1957 // Parse remaining options
1958 // Max 2 params; -o is a list, -v is a counter
1959 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
1960 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
1961 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
1962 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
1963 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1964 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1967 // If we have no arguments, show currently mounted filesystems
1969 if (!(opt & OPT_a)) {
1970 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1973 bb_error_msg_and_die("no %s", bb_path_mtab_file);
1975 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1978 // Don't show rootfs. FIXME: why??
1979 // util-linux 2.12a happily shows rootfs...
1980 //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
1982 if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
1983 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1984 mtpair->mnt_dir, mtpair->mnt_type,
1987 if (ENABLE_FEATURE_CLEAN_UP)
1988 endmntent(mountTable);
1989 return EXIT_SUCCESS;
1991 storage_path = NULL;
1993 // When we have two arguments, the second is the directory and we can
1994 // skip looking at fstab entirely. We can always abspath() the directory
1995 // argument when we get it.
1998 bb_error_msg_and_die(bb_msg_you_must_be_root);
1999 mtpair->mnt_fsname = argv[0];
2000 mtpair->mnt_dir = argv[1];
2001 mtpair->mnt_type = fstype;
2002 mtpair->mnt_opts = cmdopts;
2003 resolve_mount_spec(&mtpair->mnt_fsname);
2004 rc = singlemount(mtpair, /*ignore_busy:*/ 0);
2007 storage_path = bb_simplify_path(argv[0]); // malloced
2010 // Past this point, we are handling either "mount -a [opts]"
2011 // or "mount [opts] single_param"
2013 i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
2014 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
2015 bb_error_msg_and_die(bb_msg_you_must_be_root);
2017 // If we have a shared subtree flag, don't worry about fstab or mtab.
2018 if (ENABLE_FEATURE_MOUNT_FLAGS
2019 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
2021 // verbose_mount(source, target, type, flags, data)
2022 rc = verbose_mount("", argv[0], "", i, "");
2024 bb_simple_perror_msg_and_die(argv[0]);
2028 // Open either fstab or mtab
2029 fstabname = "/etc/fstab";
2030 if (i & MS_REMOUNT) {
2031 // WARNING. I am not sure this matches util-linux's
2032 // behavior. It's possible util-linux does not
2033 // take -o opts from mtab (takes only mount source).
2034 fstabname = bb_path_mtab_file;
2036 fstab = setmntent(fstabname, "r");
2038 bb_perror_msg_and_die("can't read '%s'", fstabname);
2040 // Loop through entries until we find what we're looking for
2041 memset(mtpair, 0, sizeof(mtpair));
2043 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
2045 // Get next fstab entry
2046 if (!getmntent_r(fstab, mtcur, getmntent_buf
2047 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
2048 GETMNTENT_BUFSIZE/2)
2049 ) { // End of fstab/mtab is reached
2050 mtcur = mtother; // the thing we found last time
2054 // If we're trying to mount something specific and this isn't it,
2055 // skip it. Note we must match the exact text in fstab (ala
2056 // "proc") or a full path from root
2059 // Is this what we're looking for?
2060 if (strcmp(argv[0], mtcur->mnt_fsname) != 0
2061 && strcmp(storage_path, mtcur->mnt_fsname) != 0
2062 && strcmp(argv[0], mtcur->mnt_dir) != 0
2063 && strcmp(storage_path, mtcur->mnt_dir) != 0
2068 // Remember this entry. Something later may have
2069 // overmounted it, and we want the _last_ match.
2072 // If we're mounting all
2075 // No, mount -a won't mount anything,
2076 // even user mounts, for mere humans
2078 bb_error_msg_and_die(bb_msg_you_must_be_root);
2080 // Does type match? (NULL matches always)
2081 if (!match_fstype(mtcur, fstype))
2084 // Skip noauto and swap anyway
2085 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
2086 // swap is bogus "fstype", parse_mount_options can't check fstypes
2087 || strcasecmp(mtcur->mnt_type, "swap") == 0
2092 // Does (at least one) option match?
2093 // (NULL matches always)
2094 if (!match_opt(mtcur->mnt_opts, O_optmatch))
2097 resolve_mount_spec(&mtcur->mnt_fsname);
2099 // NFS mounts want this to be xrealloc-able
2100 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2102 // If nothing is mounted on this directory...
2103 // (otherwise repeated "mount -a" mounts everything again)
2104 mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2105 // We do not check fsname match of found mount point -
2106 // "/" may have fsname of "/dev/root" while fstab
2107 // says "/dev/something_else".
2110 bb_error_msg("according to %s, "
2111 "%s is already mounted on %s",
2113 mp->mnt_fsname, mp->mnt_dir);
2116 // ...mount this thing
2117 if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
2118 // Count number of failed mounts
2122 free(mtcur->mnt_opts);
2126 // End of fstab/mtab is reached.
2127 // Were we looking for something specific?
2128 if (argv[0]) { // yes
2131 // If we didn't find anything, complain
2132 if (!mtcur->mnt_fsname)
2133 bb_error_msg_and_die("can't find %s in %s",
2134 argv[0], fstabname);
2136 // What happens when we try to "mount swap_partition"?
2137 // (fstab containts "swap_partition swap swap defaults 0 0")
2138 // util-linux-ng 2.13.1 does this:
2139 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2140 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2141 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2142 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2143 // exit_group(32) = ?
2145 // In case we want to simply skip swap partitions:
2146 l = parse_mount_options(mtcur->mnt_opts, NULL);
2147 if ((l & MOUNT_SWAP)
2148 // swap is bogus "fstype", parse_mount_options can't check fstypes
2149 || strcasecmp(mtcur->mnt_type, "swap") == 0
2155 // fstab must have "users" or "user"
2156 l = parse_mount_options(mtcur->mnt_opts, NULL);
2157 if (!(l & MOUNT_USERS))
2158 bb_error_msg_and_die(bb_msg_you_must_be_root);
2161 //util-linux-2.12 does not do this check.
2162 //// If nothing is mounted on this directory...
2163 //// (otherwise repeated "mount FOO" mounts FOO again)
2164 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2166 // bb_error_msg("according to %s, "
2167 // "%s is already mounted on %s",
2168 // bb_path_mtab_file,
2169 // mp->mnt_fsname, mp->mnt_dir);
2171 // ...mount the last thing we found
2172 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2173 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2174 resolve_mount_spec(&mtpair->mnt_fsname);
2175 rc = singlemount(mtcur, /*ignore_busy:*/ 0);
2176 if (ENABLE_FEATURE_CLEAN_UP)
2177 free(mtcur->mnt_opts);
2182 if (ENABLE_FEATURE_CLEAN_UP)
2184 if (ENABLE_FEATURE_CLEAN_UP) {
2189 //TODO: exitcode should be ORed mask of (from "man mount"):
2191 // 1 incorrect invocation or permissions
2192 // 2 system error (out of memory, cannot fork, no more loop devices)
2193 // 4 internal mount bug or missing nfs support in mount
2195 //16 problems writing or locking /etc/mtab
2197 //64 some mount succeeded