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 tarball for details.
12 /* Design notes: There is no spec for mount. Remind me to write one.
14 mount_main() calls singlemount() which calls mount_it_now().
16 mount_main() can loop through /etc/fstab for mount -a
17 singlemount() can loop through /etc/filesystems for fstype detection.
18 mount_it_now() does the actual mount.
25 /* For FEATURE_MOUNT_LABEL only */
26 #include "volume_id.h"
28 /* Needed for nfs support only */
29 #include <sys/utsname.h>
33 #include <rpc/pmap_prot.h>
34 #include <rpc/pmap_clnt.h>
37 #define MS_SILENT (1 << 15)
39 /* Grab more as needed from util-linux's mount/mount_constants.h */
41 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
45 #if defined(__dietlibc__)
46 /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
47 * dietlibc-0.30 does not have implementation of getmntent_r() */
48 static struct mntent *getmntent_r(FILE* stream, struct mntent* result, char* buffer, int bufsize)
50 struct mntent* ment = getmntent(stream);
51 memcpy(result, ment, sizeof(struct mntent));
57 // Not real flags, but we want to be able to check for this.
59 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
60 MOUNT_NOAUTO = (1 << 29),
61 MOUNT_SWAP = (1 << 30),
65 #define OPTION_STR "o:t:rwanfvsi"
79 #if ENABLE_FEATURE_MTAB_SUPPORT
80 #define useMtab (!(option_mask32 & OPT_n))
85 #if ENABLE_FEATURE_MOUNT_FAKE
86 #define fakeIt (option_mask32 & OPT_f)
92 // TODO: more "user" flag compatibility.
93 // "user" option (from mount manpage):
94 // Only the user that mounted a filesystem can unmount it again.
95 // If any user should be able to unmount, then use users instead of user
96 // in the fstab line. The owner option is similar to the user option,
97 // with the restriction that the user must be the owner of the special file.
98 // This may be useful e.g. for /dev/fd if a login script makes
99 // the console user owner of this device.
101 /* Standard mount options (from -o options or --options), with corresponding
104 static const int32_t mount_options[] = {
105 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
107 USE_FEATURE_MOUNT_LOOP(
111 USE_FEATURE_MOUNT_FSTAB(
113 /* "quiet" 0 - do not filter out, vfat wants to see it */
114 /* "noauto" */ MOUNT_NOAUTO,
115 /* "sw" */ MOUNT_SWAP,
116 /* "swap" */ MOUNT_SWAP,
117 USE_DESKTOP(/* "user" */ MOUNT_USERS,)
118 USE_DESKTOP(/* "users" */ MOUNT_USERS,)
122 USE_FEATURE_MOUNT_FLAGS(
124 /* "nosuid" */ MS_NOSUID,
125 /* "suid" */ ~MS_NOSUID,
126 /* "dev" */ ~MS_NODEV,
127 /* "nodev" */ MS_NODEV,
128 /* "exec" */ ~MS_NOEXEC,
129 /* "noexec" */ MS_NOEXEC,
130 /* "sync" */ MS_SYNCHRONOUS,
131 /* "dirsync" */ MS_DIRSYNC,
132 /* "async" */ ~MS_SYNCHRONOUS,
133 /* "atime" */ ~MS_NOATIME,
134 /* "noatime" */ MS_NOATIME,
135 /* "diratime" */ ~MS_NODIRATIME,
136 /* "nodiratime" */ MS_NODIRATIME,
137 /* "loud" */ ~MS_SILENT,
140 /* "bind" */ MS_BIND,
141 /* "move" */ MS_MOVE,
142 /* "shared" */ MS_SHARED,
143 /* "slave" */ MS_SLAVE,
144 /* "private" */ MS_PRIVATE,
145 /* "unbindable" */ MS_UNBINDABLE,
146 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
147 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
148 /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
149 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
152 // Always understood.
153 /* "ro" */ MS_RDONLY, // vfs flag
154 /* "rw" */ ~MS_RDONLY, // vfs flag
155 /* "remount" */ MS_REMOUNT // action flag
158 static const char mount_option_str[] =
159 USE_FEATURE_MOUNT_LOOP(
162 USE_FEATURE_MOUNT_FSTAB(
164 /* "quiet" "\0" - do not filter out, vfat wants to see it */
168 USE_DESKTOP("user" "\0")
169 USE_DESKTOP("users" "\0")
172 USE_FEATURE_MOUNT_FLAGS(
202 // Always understood.
203 "ro" "\0" // vfs flag
204 "rw" "\0" // vfs flag
205 "remount" "\0" // action flag
210 #if ENABLE_FEATURE_MOUNT_NFS
211 smalluint nfs_mount_version;
213 #if ENABLE_FEATURE_MOUNT_VERBOSE
217 char getmntent_buf[sizeof(bb_common_bufsiz1) - 8*3];
220 #define G (*(struct globals*)&bb_common_bufsiz1)
221 #define nfs_mount_version (G.nfs_mount_version)
222 #if ENABLE_FEATURE_MOUNT_VERBOSE
223 #define verbose (G.verbose )
227 #define fslist (G.fslist )
228 #define getmntent_buf (G.getmntent_buf )
231 #if ENABLE_FEATURE_MOUNT_VERBOSE
232 static int verbose_mount(const char *source, const char *target,
233 const char *filesystemtype,
234 unsigned long mountflags, const void *data)
239 rc = mount(source, target, filesystemtype, mountflags, data);
241 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
242 source, target, filesystemtype,
243 mountflags, (char*)data, rc);
247 #define verbose_mount(...) mount(__VA_ARGS__)
250 static int resolve_mount_spec(char **fsname)
254 if (!strncmp(*fsname, "UUID=", 5))
255 tmp = get_devname_from_uuid(*fsname + 5);
256 else if (!strncmp(*fsname, "LABEL=", 6))
257 tmp = get_devname_from_label(*fsname + 6);
266 /* Append mount options to string */
267 static void append_mount_options(char **oldopts, const char *newopts)
269 if (*oldopts && **oldopts) {
270 /* do not insert options which are already there */
273 int len = strlen(newopts);
274 p = strchr(newopts, ',');
275 if (p) len = p - newopts;
278 if (!strncmp(p, newopts, len)
279 && (p[len] == ',' || p[len] == '\0'))
285 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
290 while (newopts[0] == ',') newopts++;
293 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
294 *oldopts = xstrdup(newopts);
298 /* Use the mount_options list to parse options into flags.
299 * Also return list of unrecognized options if unrecognized!=NULL */
300 static long parse_mount_options(char *options, char **unrecognized)
302 long flags = MS_SILENT;
304 // Loop through options
307 char *comma = strchr(options, ',');
308 const char *option_str = mount_option_str;
310 if (comma) *comma = '\0';
312 // Find this option in mount_options
313 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
314 if (!strcasecmp(option_str, options)) {
315 long fl = mount_options[i];
316 if (fl < 0) flags &= fl;
320 option_str += strlen(option_str) + 1;
322 // If unrecognized not NULL, append unrecognized mount options */
323 if (unrecognized && i == ARRAY_SIZE(mount_options)) {
324 // Add it to strflags, to pass on to kernel
325 i = *unrecognized ? strlen(*unrecognized) : 0;
326 *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
328 // Comma separated if it's not the first one
329 if (i) (*unrecognized)[i++] = ',';
330 strcpy((*unrecognized)+i, options);
335 // Advance to next option
343 // Return a list of all block device backed filesystems
345 static llist_t *get_block_backed_filesystems(void)
347 static const char filesystems[2][sizeof("/proc/filesystems")] = {
356 for (i = 0; i < 2; i++) {
357 f = fopen(filesystems[i], "r");
360 while ((buf = xmalloc_getline(f)) != 0) {
361 if (!strncmp(buf, "nodev", 5) && isspace(buf[5]))
363 fs = skip_whitespace(buf);
364 if (*fs=='#' || *fs=='*' || !*fs) continue;
366 llist_add_to_end(&list, xstrdup(fs));
369 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
375 #if ENABLE_FEATURE_CLEAN_UP
376 static void delete_block_backed_filesystems(void)
378 llist_free(fslist, free);
381 void delete_block_backed_filesystems(void);
384 // Perform actual mount of specific filesystem at specific location.
385 // NB: mp->xxx fields may be trashed on exit
386 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
392 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
393 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
394 vfsflags, filteropts);
398 // Mount, with fallback to read-only if necessary.
401 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
402 vfsflags, filteropts);
404 // If mount failed, try
405 // helper program <mnt_type>
406 if (ENABLE_FEATURE_MOUNT_HELPERS && rc) {
408 int errno_save = errno;
409 args[0] = xasprintf("mount.%s", mp->mnt_type);
412 args[rc++] = (char *)"-o";
413 args[rc++] = filteropts;
415 args[rc++] = mp->mnt_fsname;
416 args[rc++] = mp->mnt_dir;
418 rc = wait4pid(spawn(args));
425 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
427 if (!(vfsflags & MS_SILENT))
428 bb_error_msg("%s is write-protected, mounting read-only",
430 vfsflags |= MS_RDONLY;
433 // Abort entirely if permission denied.
435 if (rc && errno == EPERM)
436 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
438 /* If the mount was successful, and we're maintaining an old-style
439 * mtab file by hand, add the new entry to it now. */
441 if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
443 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
444 const char *option_str = mount_option_str;
448 bb_error_msg("no %s", bb_path_mtab_file);
452 // Add vfs string flags
454 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
455 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
456 append_mount_options(&(mp->mnt_opts), option_str);
457 option_str += strlen(option_str) + 1;
460 // Remove trailing / (if any) from directory we mounted on
462 i = strlen(mp->mnt_dir) - 1;
463 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
465 // Convert to canonical pathnames as needed
467 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
469 if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */
470 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
471 mp->mnt_type = (char*)"bind";
473 mp->mnt_freq = mp->mnt_passno = 0;
477 addmntent(mountTable, mp);
478 endmntent(mountTable);
479 if (ENABLE_FEATURE_CLEAN_UP) {
488 #if ENABLE_FEATURE_MOUNT_NFS
492 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
494 * Licensed under GPLv2, see file LICENSE in this tarball for details.
496 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
497 * numbers to be specified on the command line.
499 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
500 * Omit the call to connect() for Linux version 1.3.11 or later.
502 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
503 * Implemented the "bg", "fg" and "retry" mount options for NFS.
505 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
506 * - added Native Language Support
508 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
512 /* This is just a warning of a common mistake. Possibly this should be a
513 * uclibc faq entry rather than in busybox... */
514 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
515 #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
518 #define MOUNTPORT 635
519 #define MNTPATHLEN 1024
520 #define MNTNAMLEN 255
524 typedef char fhandle[FHSIZE];
527 unsigned int fhandle3_len;
539 MNT3ERR_NAMETOOLONG = 63,
540 MNT3ERR_NOTSUPP = 10004,
541 MNT3ERR_SERVERFAULT = 10006,
543 typedef enum mountstat3 mountstat3;
546 unsigned int fhs_status;
551 typedef struct fhstatus fhstatus;
553 struct mountres3_ok {
556 unsigned int auth_flavours_len;
557 char *auth_flavours_val;
560 typedef struct mountres3_ok mountres3_ok;
563 mountstat3 fhs_status;
565 mountres3_ok mountinfo;
568 typedef struct mountres3 mountres3;
570 typedef char *dirpath;
574 typedef struct mountbody *mountlist;
578 dirpath ml_directory;
581 typedef struct mountbody mountbody;
583 typedef struct groupnode *groups;
589 typedef struct groupnode groupnode;
591 typedef struct exportnode *exports;
598 typedef struct exportnode exportnode;
611 typedef struct ppathcnf ppathcnf;
613 #define MOUNTPROG 100005
616 #define MOUNTPROC_NULL 0
617 #define MOUNTPROC_MNT 1
618 #define MOUNTPROC_DUMP 2
619 #define MOUNTPROC_UMNT 3
620 #define MOUNTPROC_UMNTALL 4
621 #define MOUNTPROC_EXPORT 5
622 #define MOUNTPROC_EXPORTALL 6
624 #define MOUNTVERS_POSIX 2
626 #define MOUNTPROC_PATHCONF 7
630 #define MOUNTPROC3_NULL 0
631 #define MOUNTPROC3_MNT 1
632 #define MOUNTPROC3_DUMP 2
633 #define MOUNTPROC3_UMNT 3
634 #define MOUNTPROC3_UMNTALL 4
635 #define MOUNTPROC3_EXPORT 5
647 * We want to be able to compile mount on old kernels in such a way
648 * that the binary will work well on more recent kernels.
649 * Thus, if necessary we teach nfsmount.c the structure of new fields
650 * that will come later.
652 * Moreover, the new kernel includes conflict with glibc includes
653 * so it is easiest to ignore the kernel altogether (at compile time).
661 unsigned char data[64];
664 struct nfs_mount_data {
667 struct nfs2_fh old_root; /* 1 */
673 int acregmin; /* 1 */
674 int acregmax; /* 1 */
675 int acdirmin; /* 1 */
676 int acdirmax; /* 1 */
677 struct sockaddr_in addr; /* 1 */
678 char hostname[256]; /* 1 */
680 unsigned int bsize; /* 3 */
681 struct nfs3_fh root; /* 4 */
684 /* bits in the flags field */
686 NFS_MOUNT_SOFT = 0x0001, /* 1 */
687 NFS_MOUNT_INTR = 0x0002, /* 1 */
688 NFS_MOUNT_SECURE = 0x0004, /* 1 */
689 NFS_MOUNT_POSIX = 0x0008, /* 1 */
690 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
691 NFS_MOUNT_NOAC = 0x0020, /* 1 */
692 NFS_MOUNT_TCP = 0x0040, /* 2 */
693 NFS_MOUNT_VER3 = 0x0080, /* 3 */
694 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
695 NFS_MOUNT_NONLM = 0x0200 /* 3 */
700 * We need to translate between nfs status return values and
701 * the local errno values which may not be the same.
703 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
704 * "after #include <errno.h> the symbol errno is reserved for any use,
705 * it cannot even be used as a struct tag or field name".
709 #define EDQUOT ENOSPC
712 // Convert each NFSERR_BLAH into EBLAH
714 static const struct {
718 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
719 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
720 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
721 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
724 static char *nfs_strerror(int status)
728 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
729 if (nfs_errtbl[i].stat == status)
730 return strerror(nfs_errtbl[i].errnum);
732 return xasprintf("unknown nfs status return value: %d", status);
735 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
737 if (!xdr_opaque(xdrs, objp, FHSIZE))
742 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
744 if (!xdr_u_int(xdrs, &objp->fhs_status))
746 switch (objp->fhs_status) {
748 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
757 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
759 if (!xdr_string(xdrs, objp, MNTPATHLEN))
764 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
766 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
771 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
773 if (!xdr_fhandle3(xdrs, &objp->fhandle))
775 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
776 sizeof (int), (xdrproc_t) xdr_int))
781 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
783 if (!xdr_enum(xdrs, (enum_t *) objp))
788 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
790 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
792 switch (objp->fhs_status) {
794 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
803 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
806 * Unfortunately, the kernel prints annoying console messages
807 * in case of an unexpected nfs mount version (instead of
808 * just returning some error). Therefore we'll have to try
809 * and figure out what version the kernel expects.
812 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
813 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
814 * nfs_mount_version: version this source and running kernel can handle
817 find_kernel_nfs_mount_version(void)
821 if (nfs_mount_version)
824 nfs_mount_version = 4; /* default */
826 kernel_version = get_linux_version_code();
827 if (kernel_version) {
828 if (kernel_version < KERNEL_VERSION(2,1,32))
829 nfs_mount_version = 1;
830 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
831 (kernel_version >= KERNEL_VERSION(2,3,0) &&
832 kernel_version < KERNEL_VERSION(2,3,99)))
833 nfs_mount_version = 3;
834 /* else v4 since 2.3.99pre4 */
839 get_mountport(struct pmap *pm_mnt,
840 struct sockaddr_in *server_addr,
842 long unsigned version,
846 struct pmaplist *pmap;
848 server_addr->sin_port = PMAPPORT;
849 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
850 * I understand it like "IPv6 for this is not 100% ready" */
851 pmap = pmap_getmaps(server_addr);
853 if (version > MAX_NFSPROT)
854 version = MAX_NFSPROT;
857 pm_mnt->pm_prog = prog;
858 pm_mnt->pm_vers = version;
859 pm_mnt->pm_prot = proto;
860 pm_mnt->pm_port = port;
863 if (pmap->pml_map.pm_prog != prog)
865 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
867 if (version > 2 && pmap->pml_map.pm_vers != version)
869 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
871 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
872 (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) ||
873 (port && pmap->pml_map.pm_port != port))
875 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
877 pmap = pmap->pml_next;
879 if (!pm_mnt->pm_vers)
880 pm_mnt->pm_vers = MOUNTVERS;
881 if (!pm_mnt->pm_port)
882 pm_mnt->pm_port = MOUNTPORT;
883 if (!pm_mnt->pm_prot)
884 pm_mnt->pm_prot = IPPROTO_TCP;
888 static int daemonize(void)
892 if (pid < 0) /* error */
894 if (pid > 0) /* parent */
897 fd = xopen(bb_dev_null, O_RDWR);
901 while (fd > 2) close(fd--);
903 openlog(applet_name, LOG_PID, LOG_DAEMON);
904 logmode = LOGMODE_SYSLOG;
908 static inline int daemonize(void) { return -ENOSYS; }
912 static inline int we_saw_this_host_before(const char *hostname)
917 /* RPC strerror analogs are terminally idiotic:
918 * *mandatory* prefix and \n at end.
919 * This hopefully helps. Usage:
920 * error_msg_rpc(clnt_*error*(" ")) */
921 static void error_msg_rpc(const char *msg)
924 while (msg[0] == ' ' || msg[0] == ':') msg++;
926 while (len && msg[len-1] == '\n') len--;
927 bb_error_msg("%.*s", len, msg);
930 // NB: mp->xxx fields may be trashed on exit
931 static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
937 struct nfs_mount_data data;
940 struct sockaddr_in server_addr;
941 struct sockaddr_in mount_server_addr;
944 struct fhstatus nfsv2;
945 struct mountres3 nfsv3;
971 find_kernel_nfs_mount_version();
979 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
981 filteropts = xstrdup(filteropts); /* going to trash it later... */
983 hostname = xstrdup(mp->mnt_fsname);
984 /* mount_main() guarantees that ':' is there */
985 s = strchr(hostname, ':');
988 /* Ignore all but first hostname in replicated mounts
989 until they can be fully supported. (mack@sgi.com) */
990 s = strchr(hostname, ',');
993 bb_error_msg("warning: multiple hostnames not supported");
996 server_addr.sin_family = AF_INET;
997 if (!inet_aton(hostname, &server_addr.sin_addr)) {
998 hp = gethostbyname(hostname);
1000 bb_herror_msg("%s", hostname);
1003 if (hp->h_length > sizeof(struct in_addr)) {
1004 bb_error_msg("got bad hp->h_length");
1005 hp->h_length = sizeof(struct in_addr);
1007 memcpy(&server_addr.sin_addr,
1008 hp->h_addr, hp->h_length);
1011 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1013 /* add IP address to mtab options for use when unmounting */
1015 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1016 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1018 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1019 mp->mnt_opts[0] ? "," : "",
1020 inet_ntoa(server_addr.sin_addr));
1025 /* Set default options.
1026 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1027 * let the kernel decide.
1028 * timeo is filled in after we know whether it'll be TCP or UDP. */
1029 memset(&data, 0, sizeof(data));
1035 data.namlen = NAME_MAX;
1043 retry = 10000; /* 10000 minutes ~ 1 week */
1046 mountprog = MOUNTPROG;
1054 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1055 char *opteq = strchr(opt, '=');
1057 static const char options[] ALIGN1 =
1062 /* 4 */ "acregmin\0"
1063 /* 5 */ "acregmax\0"
1064 /* 6 */ "acdirmin\0"
1065 /* 7 */ "acdirmax\0"
1069 /* 11 */ "mountport\0"
1070 /* 12 */ "mounthost\0"
1071 /* 13 */ "mountprog\0"
1072 /* 14 */ "mountvers\0"
1073 /* 15 */ "nfsprog\0"
1074 /* 16 */ "nfsvers\0"
1079 int val = xatoi_u(opteq + 1);
1081 switch (index_in_strings(options, opt)) {
1091 case 3: // "retrans"
1094 case 4: // "acregmin"
1095 data.acregmin = val;
1097 case 5: // "acregmax"
1098 data.acregmax = val;
1100 case 6: // "acdirmin"
1101 data.acdirmin = val;
1103 case 7: // "acdirmax"
1104 data.acdirmax = val;
1106 case 8: // "actimeo"
1107 data.acregmin = val;
1108 data.acregmax = val;
1109 data.acdirmin = val;
1110 data.acdirmax = val;
1118 case 11: // "mountport"
1121 case 12: // "mounthost"
1122 mounthost = xstrndup(opteq+1,
1123 strcspn(opteq+1," \t\n\r,"));
1125 case 13: // "mountprog"
1128 case 14: // "mountvers"
1131 case 15: // "nfsprog"
1134 case 16: // "nfsvers"
1139 if (!strncmp(opteq+1, "tcp", 3))
1141 else if (!strncmp(opteq+1, "udp", 3))
1144 bb_error_msg("warning: unrecognized proto= option");
1146 case 19: // "namlen"
1147 if (nfs_mount_version >= 2)
1150 bb_error_msg("warning: option namlen is not supported\n");
1152 case 20: // "addr" - ignore
1155 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1160 static const char options[] ALIGN1 =
1173 if (!strncmp(opt, "no", 2)) {
1177 switch (index_in_strings(options, opt)) {
1213 if (nfs_mount_version >= 3)
1216 bb_error_msg("warning: option nolock is not supported");
1219 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1224 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1226 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1227 | (intr ? NFS_MOUNT_INTR : 0)
1228 | (posix ? NFS_MOUNT_POSIX : 0)
1229 | (nocto ? NFS_MOUNT_NOCTO : 0)
1230 | (noac ? NFS_MOUNT_NOAC : 0);
1231 if (nfs_mount_version >= 2)
1232 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1233 if (nfs_mount_version >= 3)
1234 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1235 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1236 bb_error_msg("NFSv%d not supported", nfsvers);
1239 if (nfsvers && !mountvers)
1240 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1241 if (nfsvers && nfsvers < mountvers) {
1242 mountvers = nfsvers;
1245 /* Adjust options if none specified */
1247 data.timeo = tcp ? 70 : 7;
1249 data.version = nfs_mount_version;
1251 if (vfsflags & MS_REMOUNT)
1255 * If the previous mount operation on the same host was
1256 * backgrounded, and the "bg" for this mount is also set,
1257 * give up immediately, to avoid the initial timeout.
1259 if (bg && we_saw_this_host_before(hostname)) {
1260 daemonized = daemonize();
1261 if (daemonized <= 0) { /* parent or error */
1262 retval = -daemonized;
1267 /* create mount daemon client */
1268 /* See if the nfs host = mount host. */
1270 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1271 mount_server_addr.sin_family = AF_INET;
1272 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1274 hp = gethostbyname(mounthost);
1276 bb_herror_msg("%s", mounthost);
1279 if (hp->h_length > sizeof(struct in_addr)) {
1280 bb_error_msg("got bad hp->h_length?");
1281 hp->h_length = sizeof(struct in_addr);
1283 mount_server_addr.sin_family = AF_INET;
1284 memcpy(&mount_server_addr.sin_addr,
1285 hp->h_addr, hp->h_length);
1291 * The following loop implements the mount retries. When the mount
1292 * times out, and the "bg" option is set, we background ourself
1293 * and continue trying.
1295 * The case where the mount point is not present and the "bg"
1296 * option is set, is treated as a timeout. This is done to
1297 * support nested mounts.
1299 * The "retry" count specified by the user is the number of
1300 * minutes to retry before giving up.
1303 struct timeval total_timeout;
1304 struct timeval retry_timeout;
1310 retry_timeout.tv_sec = 3;
1311 retry_timeout.tv_usec = 0;
1312 total_timeout.tv_sec = 20;
1313 total_timeout.tv_usec = 0;
1314 timeout = time(NULL) + 60 * retry;
1318 /* be careful not to use too many CPU cycles */
1322 get_mountport(&pm_mnt, &mount_server_addr,
1327 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1329 /* contact the mount daemon via TCP */
1330 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1331 msock = RPC_ANYSOCK;
1333 switch (pm_mnt.pm_prot) {
1335 mclient = clntudp_create(&mount_server_addr,
1342 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1343 msock = RPC_ANYSOCK;
1345 mclient = clnttcp_create(&mount_server_addr,
1354 if (!daemonized && prevt == 0)
1355 error_msg_rpc(clnt_spcreateerror(" "));
1357 enum clnt_stat clnt_stat;
1358 /* try to mount hostname:pathname */
1359 mclient->cl_auth = authunix_create_default();
1361 /* make pointers in xdr_mountres3 NULL so
1362 * that xdr_array allocates memory for us
1364 memset(&status, 0, sizeof(status));
1366 if (pm_mnt.pm_vers == 3)
1367 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1368 (xdrproc_t) xdr_dirpath,
1369 (caddr_t) &pathname,
1370 (xdrproc_t) xdr_mountres3,
1374 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1375 (xdrproc_t) xdr_dirpath,
1376 (caddr_t) &pathname,
1377 (xdrproc_t) xdr_fhstatus,
1381 if (clnt_stat == RPC_SUCCESS)
1382 goto prepare_kernel_data; /* we're done */
1383 if (errno != ECONNREFUSED) {
1384 error_msg_rpc(clnt_sperror(mclient, " "));
1385 goto fail; /* don't retry */
1387 /* Connection refused */
1388 if (!daemonized && prevt == 0) /* print just once */
1389 error_msg_rpc(clnt_sperror(mclient, " "));
1390 auth_destroy(mclient->cl_auth);
1391 clnt_destroy(mclient);
1397 /* Timeout. We are going to retry... maybe */
1402 daemonized = daemonize();
1403 if (daemonized <= 0) { /* parent or error */
1404 retval = -daemonized;
1411 /* TODO error message */
1417 prepare_kernel_data:
1420 if (status.nfsv2.fhs_status != 0) {
1421 bb_error_msg("%s:%s failed, reason given by server: %s",
1423 nfs_strerror(status.nfsv2.fhs_status));
1426 memcpy(data.root.data,
1427 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1429 data.root.size = NFS_FHSIZE;
1430 memcpy(data.old_root.data,
1431 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1434 fhandle3 *my_fhandle;
1435 if (status.nfsv3.fhs_status != 0) {
1436 bb_error_msg("%s:%s failed, reason given by server: %s",
1438 nfs_strerror(status.nfsv3.fhs_status));
1441 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1442 memset(data.old_root.data, 0, NFS_FHSIZE);
1443 memset(&data.root, 0, sizeof(data.root));
1444 data.root.size = my_fhandle->fhandle3_len;
1445 memcpy(data.root.data,
1446 (char *) my_fhandle->fhandle3_val,
1447 my_fhandle->fhandle3_len);
1449 data.flags |= NFS_MOUNT_VER3;
1452 /* create nfs socket for kernel */
1455 if (nfs_mount_version < 3) {
1456 bb_error_msg("NFS over TCP is not supported");
1459 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1461 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1463 bb_perror_msg("nfs socket");
1466 if (bindresvport(fsock, 0) < 0) {
1467 bb_perror_msg("nfs bindresvport");
1471 server_addr.sin_port = PMAPPORT;
1472 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1473 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1477 server_addr.sin_port = htons(port);
1479 /* prepare data structure for kernel */
1482 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1483 strncpy(data.hostname, hostname, sizeof(data.hostname));
1487 auth_destroy(mclient->cl_auth);
1488 clnt_destroy(mclient);
1493 /* We must wait until mount directory is available */
1494 struct stat statbuf;
1496 while (stat(mp->mnt_dir, &statbuf) == -1) {
1498 daemonized = daemonize();
1499 if (daemonized <= 0) { /* parent or error */
1500 // FIXME: parent doesn't close fsock - ??!
1501 retval = -daemonized;
1505 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1512 do_mount: /* perform actual mount */
1514 mp->mnt_type = (char*)"nfs";
1515 retval = mount_it_now(mp, vfsflags, (char*)&data);
1522 auth_destroy(mclient->cl_auth);
1523 clnt_destroy(mclient);
1537 #else /* !ENABLE_FEATURE_MOUNT_NFS */
1539 /* Never called. Call should be optimized out. */
1540 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1542 #endif /* !ENABLE_FEATURE_MOUNT_NFS */
1544 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1545 // type detection. Returns 0 for success, nonzero for failure.
1546 // NB: mp->xxx fields may be trashed on exit
1547 static int singlemount(struct mntent *mp, int ignore_busy)
1551 char *loopFile = 0, *filteropts = 0;
1555 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1557 // Treat fstype "auto" as unspecified.
1559 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1560 mp->mnt_type = NULL;
1562 // Might this be a virtual filesystem?
1564 if (ENABLE_FEATURE_MOUNT_HELPERS
1565 && (strchr(mp->mnt_fsname, '#'))
1567 char *s, *p, *args[35];
1569 // FIXME: does it allow execution of arbitrary commands?!
1570 // What args[0] can end up with?
1571 for (s = p = mp->mnt_fsname; *s && n < 35-3; ++s) {
1572 if (s[0] == '#' && s[1] != '#') {
1579 args[n++] = mp->mnt_dir;
1581 rc = wait4pid(xspawn(args));
1585 // Might this be an CIFS filesystem?
1587 if (ENABLE_FEATURE_MOUNT_CIFS
1588 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1589 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1590 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1592 len_and_sockaddr *lsa;
1597 // Replace '/' with '\' and verify that unc points to "//server/share".
1599 for (s = mp->mnt_fsname; *s; ++s)
1600 if (*s == '/') *s = '\\';
1604 s = strrchr(mp->mnt_fsname, '\\');
1605 if (s <= mp->mnt_fsname+1) goto report_error;
1607 lsa = host2sockaddr(mp->mnt_fsname+2, 0);
1609 if (!lsa) goto report_error;
1611 // insert ip=... option into string flags.
1613 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1614 ip = xasprintf("ip=%s", dotted);
1615 parse_mount_options(ip, &filteropts);
1617 // compose new unc '\\server-ip\share'
1618 // (s => slash after hostname)
1620 mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
1623 vfsflags |= MS_MANDLOCK;
1625 mp->mnt_type = (char*)"cifs";
1626 rc = mount_it_now(mp, vfsflags, filteropts);
1627 if (ENABLE_FEATURE_CLEAN_UP) {
1628 free(mp->mnt_fsname);
1636 // Might this be an NFS filesystem?
1638 if (ENABLE_FEATURE_MOUNT_NFS
1639 && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs"))
1640 && strchr(mp->mnt_fsname, ':') != NULL
1642 rc = nfsmount(mp, vfsflags, filteropts);
1646 // Look at the file. (Not found isn't a failure for remount, or for
1647 // a synthetic filesystem like proc or sysfs.)
1648 // (We use stat, not lstat, in order to allow
1649 // mount symlink_to_file_or_blkdev dir)
1651 if (!stat(mp->mnt_fsname, &st)
1652 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1654 // Do we need to allocate a loopback device for it?
1656 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1657 loopFile = bb_simplify_path(mp->mnt_fsname);
1658 mp->mnt_fsname = NULL; /* will receive malloced loop dev name */
1659 if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) {
1660 if (errno == EPERM || errno == EACCES)
1661 bb_error_msg(bb_msg_perm_denied_are_you_root);
1663 bb_perror_msg("cannot setup loop device");
1667 // Autodetect bind mounts
1669 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1670 vfsflags |= MS_BIND;
1673 /* If we know the fstype (or don't need to), jump straight
1674 * to the actual mount. */
1676 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1677 rc = mount_it_now(mp, vfsflags, filteropts);
1679 // Loop through filesystem types until mount succeeds
1682 /* Initialize list of block backed filesystems. This has to be
1683 * done here so that during "mount -a", mounts after /proc shows up
1684 * can autodetect. */
1687 fslist = get_block_backed_filesystems();
1688 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1689 atexit(delete_block_backed_filesystems);
1692 for (fl = fslist; fl; fl = fl->link) {
1693 mp->mnt_type = fl->data;
1694 rc = mount_it_now(mp, vfsflags, filteropts);
1699 // If mount failed, clean up loop file (if any).
1701 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1702 del_loop(mp->mnt_fsname);
1703 if (ENABLE_FEATURE_CLEAN_UP) {
1705 free(mp->mnt_fsname);
1710 if (ENABLE_FEATURE_CLEAN_UP)
1713 if (errno == EBUSY && ignore_busy)
1716 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1720 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1721 // each directory to be mounted.
1723 static const char must_be_root[] ALIGN1 = "you must be root";
1725 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1726 int mount_main(int argc, char **argv)
1728 enum { OPT_ALL = 0x10 };
1730 char *cmdopts = xstrdup("");
1731 char *fstype = NULL;
1732 char *storage_path = NULL;
1734 const char *fstabname;
1738 struct mntent mtpair[2], *mtcur = mtpair;
1739 SKIP_DESKTOP(const int nonroot = 0;)
1741 USE_DESKTOP( int nonroot = ) sanitize_env_if_suid();
1743 // Parse long options, like --bind and --move. Note that -o option
1744 // and --option are synonymous. Yes, this means --remount,rw works.
1746 for (i = j = 0; i < argc; i++) {
1747 if (argv[i][0] == '-' && argv[i][1] == '-') {
1748 append_mount_options(&cmdopts, argv[i]+2);
1749 } else argv[j++] = argv[i];
1754 // Parse remaining options
1756 #if ENABLE_FEATURE_MOUNT_VERBOSE
1757 opt_complementary = "vv"; // -v is a counter
1759 opt = getopt32(argv, OPTION_STR, &opt_o, &fstype
1760 USE_FEATURE_MOUNT_VERBOSE(, &verbose));
1761 if (opt & OPT_o) append_mount_options(&cmdopts, opt_o); // -o
1762 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1763 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1767 // Three or more non-option arguments? Die with a usage message.
1769 if (argc > 2) bb_show_usage();
1771 // If we have no arguments, show currently mounted filesystems
1774 if (!(opt & OPT_ALL)) {
1775 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1777 if (!mountTable) bb_error_msg_and_die("no %s", bb_path_mtab_file);
1779 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1780 sizeof(getmntent_buf)))
1782 // Don't show rootfs. FIXME: why??
1783 // util-linux 2.12a happily shows rootfs...
1784 //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1786 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1787 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1788 mtpair->mnt_dir, mtpair->mnt_type,
1791 if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable);
1792 return EXIT_SUCCESS;
1794 } else storage_path = bb_simplify_path(argv[0]);
1796 // When we have two arguments, the second is the directory and we can
1797 // skip looking at fstab entirely. We can always abspath() the directory
1798 // argument when we get it.
1802 bb_error_msg_and_die(must_be_root);
1803 mtpair->mnt_fsname = argv[0];
1804 mtpair->mnt_dir = argv[1];
1805 mtpair->mnt_type = fstype;
1806 mtpair->mnt_opts = cmdopts;
1807 if (ENABLE_FEATURE_MOUNT_LABEL) {
1808 resolve_mount_spec(&mtpair->mnt_fsname);
1810 rc = singlemount(mtpair, 0);
1814 i = parse_mount_options(cmdopts, 0); // FIXME: should be "long", not "int"
1815 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1816 bb_error_msg_and_die(must_be_root);
1818 // If we have a shared subtree flag, don't worry about fstab or mtab.
1820 if (ENABLE_FEATURE_MOUNT_FLAGS
1821 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1823 rc = verbose_mount("", argv[0], "", i, "");
1824 if (rc) bb_simple_perror_msg_and_die(argv[0]);
1828 // Open either fstab or mtab
1830 fstabname = "/etc/fstab";
1831 if (i & MS_REMOUNT) {
1832 fstabname = bb_path_mtab_file;
1834 fstab = setmntent(fstabname, "r");
1836 bb_perror_msg_and_die("cannot read %s", fstabname);
1838 // Loop through entries until we find what we're looking for.
1840 memset(mtpair, 0, sizeof(mtpair));
1842 struct mntent *mtnext = (mtcur==mtpair ? mtpair+1 : mtpair);
1844 // Get next fstab entry
1846 if (!getmntent_r(fstab, mtcur, getmntent_buf
1847 + (mtcur==mtpair ? sizeof(getmntent_buf)/2 : 0),
1848 sizeof(getmntent_buf)/2))
1850 // Were we looking for something specific?
1854 // If we didn't find anything, complain.
1856 if (!mtnext->mnt_fsname)
1857 bb_error_msg_and_die("can't find %s in %s",
1858 argv[0], fstabname);
1862 // fstab must have "users" or "user"
1863 if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS))
1864 bb_error_msg_and_die(must_be_root);
1867 // Mount the last thing we found.
1869 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1870 append_mount_options(&(mtcur->mnt_opts), cmdopts);
1871 if (ENABLE_FEATURE_MOUNT_LABEL) {
1872 resolve_mount_spec(&mtpair->mnt_fsname);
1874 rc = singlemount(mtcur, 0);
1875 free(mtcur->mnt_opts);
1880 /* If we're trying to mount something specific and this isn't it,
1881 * skip it. Note we must match both the exact text in fstab (ala
1882 * "proc") or a full path from root */
1886 // Is this what we're looking for?
1888 if (strcmp(argv[0], mtcur->mnt_fsname) &&
1889 strcmp(storage_path, mtcur->mnt_fsname) &&
1890 strcmp(argv[0], mtcur->mnt_dir) &&
1891 strcmp(storage_path, mtcur->mnt_dir)) continue;
1893 // Remember this entry. Something later may have overmounted
1894 // it, and we want the _last_ match.
1898 // If we're mounting all.
1901 // Do we need to match a filesystem type?
1902 if (fstype && match_fstype(mtcur, fstype))
1905 // Skip noauto and swap anyway.
1907 if (parse_mount_options(mtcur->mnt_opts, 0) & (MOUNT_NOAUTO | MOUNT_SWAP))
1910 // No, mount -a won't mount anything,
1911 // even user mounts, for mere humans.
1914 bb_error_msg_and_die(must_be_root);
1916 // Mount this thing.
1917 if (ENABLE_FEATURE_MOUNT_LABEL)
1918 resolve_mount_spec(&mtpair->mnt_fsname);
1920 // NFS mounts want this to be xrealloc-able
1921 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1922 if (singlemount(mtcur, 1)) {
1923 /* Count number of failed mounts */
1926 free(mtcur->mnt_opts);
1929 if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
1933 if (ENABLE_FEATURE_CLEAN_UP) {