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
);
1770 #endif // !ENABLE_FEATURE_MOUNT_NFS
1772 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1773 // type detection. Returns 0 for success, nonzero for failure.
1774 // NB: mp->xxx fields may be trashed on exit
1775 static int singlemount(struct mntent
*mp
, int ignore_busy
)
1778 unsigned long vfsflags
;
1779 char *loopFile
= NULL
, *filteropts
= NULL
;
1785 vfsflags
= parse_mount_options(mp
->mnt_opts
, &filteropts
);
1787 // Treat fstype "auto" as unspecified
1788 if (mp
->mnt_type
&& strcmp(mp
->mnt_type
, "auto") == 0)
1789 mp
->mnt_type
= NULL
;
1791 // Might this be a virtual filesystem?
1792 if (ENABLE_FEATURE_MOUNT_HELPERS
&& strchr(mp
->mnt_fsname
, '#')) {
1796 // fsname: "cmd#arg1#arg2..."
1797 // WARNING: allows execution of arbitrary commands!
1798 // Try "mount 'sh#-c#sh' bogus_dir".
1799 // It is safe ONLY because non-root
1800 // cannot use two-argument mount command
1801 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1802 // "mount: can't find sh#-c#sh in /etc/fstab"
1803 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1808 while (*s
&& n
< 35 - 2) {
1809 if (*s
++ == '#' && *s
!= '#') {
1814 args
[n
++] = mp
->mnt_dir
;
1816 rc
= spawn_and_wait(args
);
1820 // Might this be an CIFS filesystem?
1821 if (ENABLE_FEATURE_MOUNT_CIFS
1822 && (!mp
->mnt_type
|| strcmp(mp
->mnt_type
, "cifs") == 0)
1823 && (mp
->mnt_fsname
[0] == '/' || mp
->mnt_fsname
[0] == '\\')
1824 && mp
->mnt_fsname
[0] == mp
->mnt_fsname
[1]
1828 char *hostname
, *share
;
1830 len_and_sockaddr
*lsa
;
1832 // Parse mp->mnt_fsname of the form "//hostname/share[/dir1/dir2]"
1834 hostname
= mp
->mnt_fsname
+ 2;
1835 len
= strcspn(hostname
, "/\\");
1836 share
= hostname
+ len
+ 1;
1837 if (len
== 0 // 3rd char is a [back]slash (IOW: empty hostname)
1838 || share
[-1] == '\0' // no [back]slash after hostname
1839 || share
[0] == '\0' // empty share name
1845 len
= strcspn(share
, "/\\");
1847 // "unc=\\hostname\share" option is mandatory
1848 // after CIFS option parsing was rewritten in Linux 3.4.
1849 // Must use backslashes.
1850 // If /dir1/dir2 is present, also add "prefixpath=dir1/dir2"
1852 char *unc
= xasprintf(
1853 share
[len
] != '\0' /* "/dir1/dir2" exists? */
1854 ? "unc=\\\\%s\\%.*s,prefixpath=%s"
1855 : "unc=\\\\%s\\%.*s",
1858 share
+ len
+ 1 /* "dir1/dir2" */
1860 parse_mount_options(unc
, &filteropts
);
1861 if (ENABLE_FEATURE_CLEAN_UP
) free(unc
);
1864 lsa
= host2sockaddr(hostname
, 0);
1869 // Insert "ip=..." option into options
1870 dotted
= xmalloc_sockaddr2dotted_noport(&lsa
->u
.sa
);
1871 if (ENABLE_FEATURE_CLEAN_UP
) free(lsa
);
1872 ip
= xasprintf("ip=%s", dotted
);
1873 if (ENABLE_FEATURE_CLEAN_UP
) free(dotted
);
1874 parse_mount_options(ip
, &filteropts
);
1875 if (ENABLE_FEATURE_CLEAN_UP
) free(ip
);
1877 mp
->mnt_type
= (char*)"cifs";
1878 rc
= mount_it_now(mp
, vfsflags
, filteropts
);
1883 // Might this be an NFS filesystem?
1884 if ((!mp
->mnt_type
|| strncmp(mp
->mnt_type
, "nfs", 3) == 0)
1885 && strchr(mp
->mnt_fsname
, ':') != NULL
1888 mp
->mnt_type
= (char*)"nfs";
1889 rc
= nfsmount(mp
, vfsflags
, filteropts
);
1893 // Look at the file. (Not found isn't a failure for remount, or for
1894 // a synthetic filesystem like proc or sysfs.)
1895 // (We use stat, not lstat, in order to allow
1896 // mount symlink_to_file_or_blkdev dir)
1897 if (!stat(mp
->mnt_fsname
, &st
)
1898 && !(vfsflags
& (MS_REMOUNT
| MS_BIND
| MS_MOVE
))
1900 // Do we need to allocate a loopback device for it?
1901 if (ENABLE_FEATURE_MOUNT_LOOP
&& S_ISREG(st
.st_mode
)) {
1902 loopFile
= bb_simplify_path(mp
->mnt_fsname
);
1903 mp
->mnt_fsname
= NULL
; // will receive malloced loop dev name
1904 if (set_loop(&mp
->mnt_fsname
, loopFile
, 0, /*ro:*/ (vfsflags
& MS_RDONLY
)) < 0) {
1905 if (errno
== EPERM
|| errno
== EACCES
)
1906 bb_error_msg(bb_msg_perm_denied_are_you_root
);
1908 bb_perror_msg("can't setup loop device");
1912 // Autodetect bind mounts
1913 } else if (S_ISDIR(st
.st_mode
) && !mp
->mnt_type
)
1914 vfsflags
|= MS_BIND
;
1917 // If we know the fstype (or don't need to), jump straight
1918 // to the actual mount.
1919 if (mp
->mnt_type
|| (vfsflags
& (MS_REMOUNT
| MS_BIND
| MS_MOVE
))) {
1922 next
= mp
->mnt_type
? strchr(mp
->mnt_type
, ',') : NULL
;
1925 rc
= mount_it_now(mp
, vfsflags
, filteropts
);
1926 if (rc
== 0 || !next
)
1928 mp
->mnt_type
= next
+ 1;
1931 // Loop through filesystem types until mount succeeds
1934 // Initialize list of block backed filesystems.
1935 // This has to be done here so that during "mount -a",
1936 // mounts after /proc shows up can autodetect.
1938 fslist
= get_block_backed_filesystems();
1939 if (ENABLE_FEATURE_CLEAN_UP
&& fslist
)
1940 atexit(delete_block_backed_filesystems
);
1943 for (fl
= fslist
; fl
; fl
= fl
->link
) {
1944 mp
->mnt_type
= fl
->data
;
1945 rc
= mount_it_now(mp
, vfsflags
, filteropts
);
1951 // If mount failed, clean up loop file (if any).
1952 if (ENABLE_FEATURE_MOUNT_LOOP
&& rc
&& loopFile
) {
1953 del_loop(mp
->mnt_fsname
);
1954 if (ENABLE_FEATURE_CLEAN_UP
) {
1956 free(mp
->mnt_fsname
);
1961 if (ENABLE_FEATURE_CLEAN_UP
)
1964 if (errno
== EBUSY
&& ignore_busy
)
1967 bb_perror_msg("mounting %s on %s failed", mp
->mnt_fsname
, mp
->mnt_dir
);
1972 // -O interprets a list of filter options which select whether a mount
1973 // point will be mounted: only mounts with options matching *all* filtering
1974 // options will be selected.
1975 // By default each -O filter option must be present in the list of mount
1976 // options, but if it is prefixed by "no" then it must be absent.
1978 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1979 // (and also fails to match -o a because -o c is absent).
1981 // It is different from -t in that each option is matched exactly; a leading
1982 // "no" at the beginning of one option does not negate the rest.
1983 static int match_opt(const char *fs_opt_in
, const char *O_opt
)
1989 const char *fs_opt
= fs_opt_in
;
1993 // If option begins with "no" then treat as an inverted match:
1994 // matching is a failure
1996 if (O_opt
[0] == 'n' && O_opt
[1] == 'o') {
2000 // Isolate the current O option
2001 O_len
= strchrnul(O_opt
, ',') - O_opt
;
2002 // Check for a match against existing options
2004 if (strncmp(fs_opt
, O_opt
, O_len
) == 0
2005 && (fs_opt
[O_len
] == '\0' || fs_opt
[O_len
] == ',')
2008 return 0; // "no" prefix, but option found
2009 match
= 1; // current O option found, go check next one
2012 fs_opt
= strchr(fs_opt
, ',');
2018 return 0; // match wanted but not found
2019 if (O_opt
[O_len
] == '\0') // end?
2021 // Step to the next O option
2024 // If we get here then everything matched
2028 // Parse options, if necessary parse fstab/mtab, and call singlemount for
2029 // each directory to be mounted.
2030 int mount_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
2031 int mount_main(int argc UNUSED_PARAM
, char **argv
)
2033 char *cmdopts
= xzalloc(1);
2034 char *fstype
= NULL
;
2035 char *O_optmatch
= NULL
;
2037 llist_t
*lst_o
= NULL
;
2038 const char *fstabname
;
2041 int rc
= EXIT_SUCCESS
;
2042 unsigned long cmdopt_flags
;
2044 struct mntent mtpair
[2], *mtcur
= mtpair
;
2045 IF_NOT_DESKTOP(const int nonroot
= 0;)
2047 IF_DESKTOP(int nonroot
= ) sanitize_env_if_suid();
2051 // Parse long options, like --bind and --move. Note that -o option
2052 // and --option are synonymous. Yes, this means --remount,rw works.
2053 for (i
= j
= 1; argv
[i
]; i
++) {
2054 if (argv
[i
][0] == '-' && argv
[i
][1] == '-')
2055 append_mount_options(&cmdopts
, argv
[i
] + 2);
2057 argv
[j
++] = argv
[i
];
2061 // Parse remaining options
2062 // Max 2 params; -o is a list, -v is a counter
2063 opt_complementary
= "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
2064 opt
= getopt32(argv
, OPTION_STR
, &lst_o
, &fstype
, &O_optmatch
2065 IF_FEATURE_MOUNT_VERBOSE(, &verbose
));
2066 while (lst_o
) append_mount_options(&cmdopts
, llist_pop(&lst_o
)); // -o
2067 if (opt
& OPT_r
) append_mount_options(&cmdopts
, "ro"); // -r
2068 if (opt
& OPT_w
) append_mount_options(&cmdopts
, "rw"); // -w
2071 // If we have no arguments, show currently mounted filesystems
2073 if (!(opt
& OPT_a
)) {
2074 FILE *mountTable
= setmntent(bb_path_mtab_file
, "r");
2077 bb_error_msg_and_die("no %s", bb_path_mtab_file
);
2079 while (getmntent_r(mountTable
, &mtpair
[0], getmntent_buf
,
2082 // Don't show rootfs. FIXME: why??
2083 // util-linux 2.12a happily shows rootfs...
2084 //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
2086 if (!fstype
|| strcmp(mtpair
->mnt_type
, fstype
) == 0)
2087 printf("%s on %s type %s (%s)\n", mtpair
->mnt_fsname
,
2088 mtpair
->mnt_dir
, mtpair
->mnt_type
,
2091 if (ENABLE_FEATURE_CLEAN_UP
)
2092 endmntent(mountTable
);
2093 return EXIT_SUCCESS
;
2095 storage_path
= NULL
;
2097 // When we have two arguments, the second is the directory and we can
2098 // skip looking at fstab entirely. We can always abspath() the directory
2099 // argument when we get it.
2102 bb_error_msg_and_die(bb_msg_you_must_be_root
);
2103 mtpair
->mnt_fsname
= argv
[0];
2104 mtpair
->mnt_dir
= argv
[1];
2105 mtpair
->mnt_type
= fstype
;
2106 mtpair
->mnt_opts
= cmdopts
;
2107 resolve_mount_spec(&mtpair
->mnt_fsname
);
2108 rc
= singlemount(mtpair
, /*ignore_busy:*/ 0);
2111 storage_path
= bb_simplify_path(argv
[0]); // malloced
2114 // Past this point, we are handling either "mount -a [opts]"
2115 // or "mount [opts] single_param"
2117 cmdopt_flags
= parse_mount_options(cmdopts
, NULL
);
2118 if (nonroot
&& (cmdopt_flags
& ~MS_SILENT
)) // Non-root users cannot specify flags
2119 bb_error_msg_and_die(bb_msg_you_must_be_root
);
2121 // If we have a shared subtree flag, don't worry about fstab or mtab.
2122 if (ENABLE_FEATURE_MOUNT_FLAGS
2123 && (cmdopt_flags
& (MS_SHARED
| MS_PRIVATE
| MS_SLAVE
| MS_UNBINDABLE
))
2125 // verbose_mount(source, target, type, flags, data)
2126 rc
= verbose_mount("", argv
[0], "", cmdopt_flags
, "");
2128 bb_simple_perror_msg_and_die(argv
[0]);
2132 // Open either fstab or mtab
2133 fstabname
= "/etc/fstab";
2134 if (cmdopt_flags
& MS_REMOUNT
) {
2135 // WARNING. I am not sure this matches util-linux's
2136 // behavior. It's possible util-linux does not
2137 // take -o opts from mtab (takes only mount source).
2138 fstabname
= bb_path_mtab_file
;
2140 fstab
= setmntent(fstabname
, "r");
2142 bb_perror_msg_and_die("can't read '%s'", fstabname
);
2144 // Loop through entries until we find what we're looking for
2145 memset(mtpair
, 0, sizeof(mtpair
));
2147 struct mntent
*mtother
= (mtcur
==mtpair
? mtpair
+1 : mtpair
);
2149 // Get next fstab entry
2150 if (!getmntent_r(fstab
, mtcur
, getmntent_buf
2151 + (mtcur
==mtpair
? GETMNTENT_BUFSIZE
/2 : 0),
2152 GETMNTENT_BUFSIZE
/2)
2153 ) { // End of fstab/mtab is reached
2154 mtcur
= mtother
; // the thing we found last time
2158 // If we're trying to mount something specific and this isn't it,
2159 // skip it. Note we must match the exact text in fstab (ala
2160 // "proc") or a full path from root
2163 // Is this what we're looking for?
2164 if (strcmp(argv
[0], mtcur
->mnt_fsname
) != 0
2165 && strcmp(storage_path
, mtcur
->mnt_fsname
) != 0
2166 && strcmp(argv
[0], mtcur
->mnt_dir
) != 0
2167 && strcmp(storage_path
, mtcur
->mnt_dir
) != 0
2172 // Remember this entry. Something later may have
2173 // overmounted it, and we want the _last_ match.
2176 // If we're mounting all
2179 // No, mount -a won't mount anything,
2180 // even user mounts, for mere humans
2182 bb_error_msg_and_die(bb_msg_you_must_be_root
);
2184 // Does type match? (NULL matches always)
2185 if (!match_fstype(mtcur
, fstype
))
2188 // Skip noauto and swap anyway
2189 if ((parse_mount_options(mtcur
->mnt_opts
, NULL
) & (MOUNT_NOAUTO
| MOUNT_SWAP
))
2190 // swap is bogus "fstype", parse_mount_options can't check fstypes
2191 || strcasecmp(mtcur
->mnt_type
, "swap") == 0
2196 // Does (at least one) option match?
2197 // (NULL matches always)
2198 if (!match_opt(mtcur
->mnt_opts
, O_optmatch
))
2201 resolve_mount_spec(&mtcur
->mnt_fsname
);
2203 // NFS mounts want this to be xrealloc-able
2204 mtcur
->mnt_opts
= xstrdup(mtcur
->mnt_opts
);
2206 // If nothing is mounted on this directory...
2207 // (otherwise repeated "mount -a" mounts everything again)
2208 mp
= find_mount_point(mtcur
->mnt_dir
, /*subdir_too:*/ 0);
2209 // We do not check fsname match of found mount point -
2210 // "/" may have fsname of "/dev/root" while fstab
2211 // says "/dev/something_else".
2214 bb_error_msg("according to %s, "
2215 "%s is already mounted on %s",
2217 mp
->mnt_fsname
, mp
->mnt_dir
);
2220 // ...mount this thing
2221 if (singlemount(mtcur
, /*ignore_busy:*/ 1)) {
2222 // Count number of failed mounts
2226 free(mtcur
->mnt_opts
);
2230 // End of fstab/mtab is reached.
2231 // Were we looking for something specific?
2232 if (argv
[0]) { // yes
2235 // If we didn't find anything, complain
2236 if (!mtcur
->mnt_fsname
)
2237 bb_error_msg_and_die("can't find %s in %s",
2238 argv
[0], fstabname
);
2240 // What happens when we try to "mount swap_partition"?
2241 // (fstab containts "swap_partition swap swap defaults 0 0")
2242 // util-linux-ng 2.13.1 does this:
2243 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2244 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2245 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2246 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2247 // exit_group(32) = ?
2249 // In case we want to simply skip swap partitions:
2250 l
= parse_mount_options(mtcur
->mnt_opts
, NULL
);
2251 if ((l
& MOUNT_SWAP
)
2252 // swap is bogus "fstype", parse_mount_options can't check fstypes
2253 || strcasecmp(mtcur
->mnt_type
, "swap") == 0
2259 // fstab must have "users" or "user"
2260 l
= parse_mount_options(mtcur
->mnt_opts
, NULL
);
2261 if (!(l
& MOUNT_USERS
))
2262 bb_error_msg_and_die(bb_msg_you_must_be_root
);
2265 //util-linux-2.12 does not do this check.
2266 //// If nothing is mounted on this directory...
2267 //// (otherwise repeated "mount FOO" mounts FOO again)
2268 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2270 // bb_error_msg("according to %s, "
2271 // "%s is already mounted on %s",
2272 // bb_path_mtab_file,
2273 // mp->mnt_fsname, mp->mnt_dir);
2275 // ...mount the last thing we found
2276 mtcur
->mnt_opts
= xstrdup(mtcur
->mnt_opts
);
2277 append_mount_options(&(mtcur
->mnt_opts
), cmdopts
);
2278 resolve_mount_spec(&mtpair
->mnt_fsname
);
2279 rc
= singlemount(mtcur
, /*ignore_busy:*/ 0);
2280 if (ENABLE_FEATURE_CLEAN_UP
)
2281 free(mtcur
->mnt_opts
);
2286 if (ENABLE_FEATURE_CLEAN_UP
)
2288 if (ENABLE_FEATURE_CLEAN_UP
) {
2293 //TODO: exitcode should be ORed mask of (from "man mount"):
2295 // 1 incorrect invocation or permissions
2296 // 2 system error (out of memory, cannot fork, no more loop devices)
2297 // 4 internal mount bug or missing nfs support in mount
2299 //16 problems writing or locking /etc/mtab
2301 //64 some mount succeeded