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.
24 /* Needed for nfs support only... */
26 #include <sys/utsname.h>
30 #include <rpc/pmap_prot.h>
31 #include <rpc/pmap_clnt.h>
34 #if defined(__dietlibc__)
35 /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
36 * dietlibc-0.30 does not have implementation of getmntent_r() */
37 /* OTOH: why we use getmntent_r instead of getmntent? TODO... */
38 struct mntent *getmntent_r(FILE* stream, struct mntent* result, char* buffer, int bufsize)
40 /* *** XXX FIXME WARNING: This hack is NOT thread safe. --Sampo */
41 struct mntent* ment = getmntent(stream);
42 memcpy(result, ment, sizeof(struct mntent));
48 // Not real flags, but we want to be able to check for this.
50 MOUNT_USERS = (1<<28)*ENABLE_DESKTOP,
51 MOUNT_NOAUTO = (1<<29),
54 // TODO: more "user" flag compatibility.
55 // "user" option (from mount manpage):
56 // Only the user that mounted a filesystem can unmount it again.
57 // If any user should be able to unmount, then use users instead of user
58 // in the fstab line. The owner option is similar to the user option,
59 // with the restriction that the user must be the owner of the special file.
60 // This may be useful e.g. for /dev/fd if a login script makes
61 // the console user owner of this device.
63 /* Standard mount options (from -o options or --options), with corresponding
69 } static mount_options[] = {
70 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
72 USE_FEATURE_MOUNT_LOOP(
76 USE_FEATURE_MOUNT_FSTAB(
78 /* {"quiet", 0}, - do not filter out, vfat wants to see it */
79 {"noauto", MOUNT_NOAUTO},
82 USE_DESKTOP({"user", MOUNT_USERS},)
83 USE_DESKTOP({"users", MOUNT_USERS},)
86 USE_FEATURE_MOUNT_FLAGS(
88 {"nosuid", MS_NOSUID},
93 {"noexec", MS_NOEXEC},
94 {"sync", MS_SYNCHRONOUS},
95 {"async", ~MS_SYNCHRONOUS},
96 {"atime", ~MS_NOATIME},
97 {"noatime", MS_NOATIME},
98 {"diratime", ~MS_NODIRATIME},
99 {"nodiratime", MS_NODIRATIME},
100 {"loud", ~MS_SILENT},
106 {"shared", MS_SHARED},
108 {"private", MS_PRIVATE},
109 {"unbindable", MS_UNBINDABLE},
110 {"rshared", MS_SHARED|MS_RECURSIVE},
111 {"rslave", MS_SLAVE|MS_RECURSIVE},
112 {"rprivate", MS_SLAVE|MS_RECURSIVE},
113 {"runbindable", MS_UNBINDABLE|MS_RECURSIVE},
116 // Always understood.
118 {"ro", MS_RDONLY}, // vfs flag
119 {"rw", ~MS_RDONLY}, // vfs flag
120 {"remount", MS_REMOUNT}, // action flag
123 #define VECTOR_SIZE(v) (sizeof(v) / sizeof((v)[0]))
125 /* Append mount options to string */
126 static void append_mount_options(char **oldopts, const char *newopts)
128 if (*oldopts && **oldopts) {
129 /* do not insert options which are already there */
132 int len = strlen(newopts);
133 p = strchr(newopts, ',');
134 if (p) len = p - newopts;
137 if (!strncmp(p, newopts, len)
138 && (p[len]==',' || p[len]==0))
144 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
149 while (newopts[0] == ',') newopts++;
152 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
153 *oldopts = xstrdup(newopts);
157 /* Use the mount_options list to parse options into flags.
158 * Also return list of unrecognized options if unrecognized!=NULL */
159 static int parse_mount_options(char *options, char **unrecognized)
161 int flags = MS_SILENT;
163 // Loop through options
166 char *comma = strchr(options, ',');
168 if (comma) *comma = 0;
170 // Find this option in mount_options
171 for (i = 0; i < VECTOR_SIZE(mount_options); i++) {
172 if (!strcasecmp(mount_options[i].name, options)) {
173 long fl = mount_options[i].flags;
174 if (fl < 0) flags &= fl;
179 // If unrecognized not NULL, append unrecognized mount options */
180 if (unrecognized && i == VECTOR_SIZE(mount_options)) {
181 // Add it to strflags, to pass on to kernel
182 i = *unrecognized ? strlen(*unrecognized) : 0;
183 *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
185 // Comma separated if it's not the first one
186 if (i) (*unrecognized)[i++] = ',';
187 strcpy((*unrecognized)+i, options);
190 // Advance to next option, or finish
200 // Return a list of all block device backed filesystems
202 static llist_t *get_block_backed_filesystems(void)
204 static const char *const filesystems[] = {
214 for (i = 0; filesystems[i]; i++) {
215 f = fopen(filesystems[i], "r");
218 while ((buf = xmalloc_getline(f)) != 0) {
219 if (!strncmp(buf, "nodev", 5) && isspace(buf[5]))
221 fs = skip_whitespace(buf);
222 if (*fs=='#' || *fs=='*' || !*fs) continue;
224 llist_add_to_end(&list, xstrdup(fs));
227 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
235 #if ENABLE_FEATURE_CLEAN_UP
236 static void delete_block_backed_filesystems(void)
238 llist_free(fslist, free);
241 void delete_block_backed_filesystems(void);
244 #if ENABLE_FEATURE_MTAB_SUPPORT
245 static int useMtab = 1;
252 // Perform actual mount of specific filesystem at specific location.
253 // NB: mp->xxx fields may be trashed on exit
254 static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
258 if (fakeIt) goto mtab;
260 // Mount, with fallback to read-only if necessary.
263 rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
264 vfsflags, filteropts);
265 if (!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
267 bb_error_msg("%s is write-protected, mounting read-only",
269 vfsflags |= MS_RDONLY;
272 // Abort entirely if permission denied.
274 if (rc && errno == EPERM)
275 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
277 /* If the mount was successful, and we're maintaining an old-style
278 * mtab file by hand, add the new entry to it now. */
280 if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
282 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
286 bb_error_msg("no %s",bb_path_mtab_file);
290 // Add vfs string flags
292 for (i=0; mount_options[i].flags != MS_REMOUNT; i++)
293 if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags))
294 append_mount_options(&(mp->mnt_opts), mount_options[i].name);
296 // Remove trailing / (if any) from directory we mounted on
298 i = strlen(mp->mnt_dir) - 1;
299 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = 0;
301 // Convert to canonical pathnames as needed
303 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
305 if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */
306 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
307 mp->mnt_type = (char*)"bind";
309 mp->mnt_freq = mp->mnt_passno = 0;
313 addmntent(mountTable, mp);
314 endmntent(mountTable);
315 if (ENABLE_FEATURE_CLEAN_UP) {
324 #if ENABLE_FEATURE_MOUNT_NFS
328 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
330 * Licensed under GPLv2, see file LICENSE in this tarball for details.
332 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
333 * numbers to be specified on the command line.
335 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
336 * Omit the call to connect() for Linux version 1.3.11 or later.
338 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
339 * Implemented the "bg", "fg" and "retry" mount options for NFS.
341 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
342 * - added Native Language Support
344 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
348 /* This is just a warning of a common mistake. Possibly this should be a
349 * uclibc faq entry rather than in busybox... */
350 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
351 #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
354 #define MOUNTPORT 635
355 #define MNTPATHLEN 1024
356 #define MNTNAMLEN 255
360 typedef char fhandle[FHSIZE];
363 unsigned int fhandle3_len;
375 MNT3ERR_NAMETOOLONG = 63,
376 MNT3ERR_NOTSUPP = 10004,
377 MNT3ERR_SERVERFAULT = 10006,
379 typedef enum mountstat3 mountstat3;
382 unsigned int fhs_status;
387 typedef struct fhstatus fhstatus;
389 struct mountres3_ok {
392 unsigned int auth_flavours_len;
393 char *auth_flavours_val;
396 typedef struct mountres3_ok mountres3_ok;
399 mountstat3 fhs_status;
401 mountres3_ok mountinfo;
404 typedef struct mountres3 mountres3;
406 typedef char *dirpath;
410 typedef struct mountbody *mountlist;
414 dirpath ml_directory;
417 typedef struct mountbody mountbody;
419 typedef struct groupnode *groups;
425 typedef struct groupnode groupnode;
427 typedef struct exportnode *exports;
434 typedef struct exportnode exportnode;
447 typedef struct ppathcnf ppathcnf;
449 #define MOUNTPROG 100005
452 #define MOUNTPROC_NULL 0
453 #define MOUNTPROC_MNT 1
454 #define MOUNTPROC_DUMP 2
455 #define MOUNTPROC_UMNT 3
456 #define MOUNTPROC_UMNTALL 4
457 #define MOUNTPROC_EXPORT 5
458 #define MOUNTPROC_EXPORTALL 6
460 #define MOUNTVERS_POSIX 2
462 #define MOUNTPROC_PATHCONF 7
466 #define MOUNTPROC3_NULL 0
467 #define MOUNTPROC3_MNT 1
468 #define MOUNTPROC3_DUMP 2
469 #define MOUNTPROC3_UMNT 3
470 #define MOUNTPROC3_UMNTALL 4
471 #define MOUNTPROC3_EXPORT 5
483 * We want to be able to compile mount on old kernels in such a way
484 * that the binary will work well on more recent kernels.
485 * Thus, if necessary we teach nfsmount.c the structure of new fields
486 * that will come later.
488 * Moreover, the new kernel includes conflict with glibc includes
489 * so it is easiest to ignore the kernel altogether (at compile time).
497 unsigned char data[64];
500 struct nfs_mount_data {
503 struct nfs2_fh old_root; /* 1 */
509 int acregmin; /* 1 */
510 int acregmax; /* 1 */
511 int acdirmin; /* 1 */
512 int acdirmax; /* 1 */
513 struct sockaddr_in addr; /* 1 */
514 char hostname[256]; /* 1 */
516 unsigned int bsize; /* 3 */
517 struct nfs3_fh root; /* 4 */
520 /* bits in the flags field */
522 NFS_MOUNT_SOFT = 0x0001, /* 1 */
523 NFS_MOUNT_INTR = 0x0002, /* 1 */
524 NFS_MOUNT_SECURE = 0x0004, /* 1 */
525 NFS_MOUNT_POSIX = 0x0008, /* 1 */
526 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
527 NFS_MOUNT_NOAC = 0x0020, /* 1 */
528 NFS_MOUNT_TCP = 0x0040, /* 2 */
529 NFS_MOUNT_VER3 = 0x0080, /* 3 */
530 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
531 NFS_MOUNT_NONLM = 0x0200 /* 3 */
536 * We need to translate between nfs status return values and
537 * the local errno values which may not be the same.
539 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
540 * "after #include <errno.h> the symbol errno is reserved for any use,
541 * it cannot even be used as a struct tag or field name".
545 #define EDQUOT ENOSPC
548 // Convert each NFSERR_BLAH into EBLAH
550 static const struct {
554 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
555 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
556 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
557 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
560 static char *nfs_strerror(int status)
563 static char buf[sizeof("unknown nfs status return value: ") + sizeof(int)*3];
565 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
566 if (nfs_errtbl[i].stat == status)
567 return strerror(nfs_errtbl[i].errnum);
569 sprintf(buf, "unknown nfs status return value: %d", status);
573 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
575 if (!xdr_opaque(xdrs, objp, FHSIZE))
580 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
582 if (!xdr_u_int(xdrs, &objp->fhs_status))
584 switch (objp->fhs_status) {
586 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
595 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
597 if (!xdr_string(xdrs, objp, MNTPATHLEN))
602 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
604 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
609 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
611 if (!xdr_fhandle3(xdrs, &objp->fhandle))
613 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
614 sizeof (int), (xdrproc_t) xdr_int))
619 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
621 if (!xdr_enum(xdrs, (enum_t *) objp))
626 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
628 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
630 switch (objp->fhs_status) {
632 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
641 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
644 * nfs_mount_version according to the sources seen at compile time.
646 static int nfs_mount_version;
647 static int kernel_version;
650 * Unfortunately, the kernel prints annoying console messages
651 * in case of an unexpected nfs mount version (instead of
652 * just returning some error). Therefore we'll have to try
653 * and figure out what version the kernel expects.
656 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
657 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
658 * nfs_mount_version: version this source and running kernel can handle
661 find_kernel_nfs_mount_version(void)
666 nfs_mount_version = 4; /* default */
668 kernel_version = get_linux_version_code();
669 if (kernel_version) {
670 if (kernel_version < KERNEL_VERSION(2,1,32))
671 nfs_mount_version = 1;
672 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
673 (kernel_version >= KERNEL_VERSION(2,3,0) &&
674 kernel_version < KERNEL_VERSION(2,3,99)))
675 nfs_mount_version = 3;
676 /* else v4 since 2.3.99pre4 */
681 get_mountport(struct sockaddr_in *server_addr,
683 long unsigned version,
687 struct pmaplist *pmap;
688 static struct pmap p = {0, 0, 0, 0};
690 server_addr->sin_port = PMAPPORT;
691 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
692 * I understand it like "IPv6 for this is not 100% ready" */
693 pmap = pmap_getmaps(server_addr);
695 if (version > MAX_NFSPROT)
696 version = MAX_NFSPROT;
705 if (pmap->pml_map.pm_prog != prog)
707 if (!version && p.pm_vers > pmap->pml_map.pm_vers)
709 if (version > 2 && pmap->pml_map.pm_vers != version)
711 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
713 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
714 (proto && p.pm_prot && pmap->pml_map.pm_prot != proto) ||
715 (port && pmap->pml_map.pm_port != port))
717 memcpy(&p, &pmap->pml_map, sizeof(p));
719 pmap = pmap->pml_next;
722 p.pm_vers = MOUNTVERS;
724 p.pm_port = MOUNTPORT;
726 p.pm_prot = IPPROTO_TCP;
730 static int daemonize(void)
734 if (pid < 0) /* error */
736 if (pid > 0) /* parent */
739 fd = xopen(bb_dev_null, O_RDWR);
743 while (fd > 2) close(fd--);
745 openlog(applet_name, LOG_PID, LOG_DAEMON);
746 logmode = LOGMODE_SYSLOG;
751 static inline int we_saw_this_host_before(const char *hostname)
756 /* RPC strerror analogs are terminally idiotic:
757 * *mandatory* prefix and \n at end.
758 * This hopefully helps. Usage:
759 * error_msg_rpc(clnt_*error*(" ")) */
760 static void error_msg_rpc(const char *msg)
763 while (msg[0] == ' ' || msg[0] == ':') msg++;
765 while (len && msg[len-1] == '\n') len--;
766 bb_error_msg("%.*s", len, msg);
769 // NB: mp->xxx fields may be trashed on exit
770 static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts)
776 struct nfs_mount_data data;
779 struct sockaddr_in server_addr;
780 struct sockaddr_in mount_server_addr;
783 struct fhstatus nfsv2;
784 struct mountres3 nfsv3;
806 find_kernel_nfs_mount_version();
814 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
816 filteropts = xstrdup(filteropts); /* going to trash it later... */
818 hostname = xstrdup(mp->mnt_fsname);
819 /* mount_main() guarantees that ':' is there */
820 s = strchr(hostname, ':');
823 /* Ignore all but first hostname in replicated mounts
824 until they can be fully supported. (mack@sgi.com) */
825 s = strchr(hostname, ',');
828 bb_error_msg("warning: multiple hostnames not supported");
831 server_addr.sin_family = AF_INET;
832 if (!inet_aton(hostname, &server_addr.sin_addr)) {
833 hp = gethostbyname(hostname);
835 bb_herror_msg("%s", hostname);
838 if (hp->h_length > sizeof(struct in_addr)) {
839 bb_error_msg("got bad hp->h_length");
840 hp->h_length = sizeof(struct in_addr);
842 memcpy(&server_addr.sin_addr,
843 hp->h_addr, hp->h_length);
846 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
848 /* add IP address to mtab options for use when unmounting */
850 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
851 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
853 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
854 mp->mnt_opts[0] ? "," : "",
855 inet_ntoa(server_addr.sin_addr));
860 /* Set default options.
861 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
862 * let the kernel decide.
863 * timeo is filled in after we know whether it'll be TCP or UDP. */
864 memset(&data, 0, sizeof(data));
870 data.namlen = NAME_MAX;
879 retry = 10000; /* 10000 minutes ~ 1 week */
882 mountprog = MOUNTPROG;
891 for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
892 char *opteq = strchr(opt, '=');
894 static const char *const options[] = {
906 /* 11 */ "mountport",
907 /* 12 */ "mounthost",
908 /* 13 */ "mountprog",
909 /* 14 */ "mountvers",
918 int val = xatoi_u(opteq + 1);
920 switch (index_in_str_array(options, opt)) {
933 case 4: // "acregmin"
936 case 5: // "acregmax"
939 case 6: // "acdirmin"
942 case 7: // "acdirmax"
957 case 11: // "mountport"
960 case 12: // "mounthost"
961 mounthost = xstrndup(opteq+1,
962 strcspn(opteq+1," \t\n\r,"));
964 case 13: // "mountprog"
967 case 14: // "mountvers"
970 case 15: // "nfsprog"
973 case 16: // "nfsvers"
978 if (!strncmp(opteq+1, "tcp", 3))
980 else if (!strncmp(opteq+1, "udp", 3))
983 bb_error_msg("warning: unrecognized proto= option");
986 if (nfs_mount_version >= 2)
989 bb_error_msg("warning: option namlen is not supported\n");
991 case 20: // "addr" - ignore
994 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
999 static const char *const options[] = {
1014 if (!strncmp(opt, "no", 2)) {
1018 switch (index_in_str_array(options, opt)) {
1050 if (nfs_mount_version >= 3)
1053 bb_error_msg("warning: option nolock is not supported");
1056 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1061 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1063 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1064 | (intr ? NFS_MOUNT_INTR : 0)
1065 | (posix ? NFS_MOUNT_POSIX : 0)
1066 | (nocto ? NFS_MOUNT_NOCTO : 0)
1067 | (noac ? NFS_MOUNT_NOAC : 0);
1068 if (nfs_mount_version >= 2)
1069 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1070 if (nfs_mount_version >= 3)
1071 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1072 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1073 bb_error_msg("NFSv%d not supported", nfsvers);
1076 if (nfsvers && !mountvers)
1077 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1078 if (nfsvers && nfsvers < mountvers) {
1079 mountvers = nfsvers;
1082 /* Adjust options if none specified */
1084 data.timeo = tcp ? 70 : 7;
1086 data.version = nfs_mount_version;
1088 if (vfsflags & MS_REMOUNT)
1092 * If the previous mount operation on the same host was
1093 * backgrounded, and the "bg" for this mount is also set,
1094 * give up immediately, to avoid the initial timeout.
1096 if (bg && we_saw_this_host_before(hostname)) {
1097 daemonized = daemonize(); /* parent or error */
1098 if (daemonized <= 0) { /* parent or error */
1099 retval = -daemonized;
1104 /* create mount daemon client */
1105 /* See if the nfs host = mount host. */
1107 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1108 mount_server_addr.sin_family = AF_INET;
1109 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1111 hp = gethostbyname(mounthost);
1113 bb_herror_msg("%s", mounthost);
1116 if (hp->h_length > sizeof(struct in_addr)) {
1117 bb_error_msg("got bad hp->h_length?");
1118 hp->h_length = sizeof(struct in_addr);
1120 mount_server_addr.sin_family = AF_INET;
1121 memcpy(&mount_server_addr.sin_addr,
1122 hp->h_addr, hp->h_length);
1128 * The following loop implements the mount retries. When the mount
1129 * times out, and the "bg" option is set, we background ourself
1130 * and continue trying.
1132 * The case where the mount point is not present and the "bg"
1133 * option is set, is treated as a timeout. This is done to
1134 * support nested mounts.
1136 * The "retry" count specified by the user is the number of
1137 * minutes to retry before giving up.
1140 struct timeval total_timeout;
1141 struct timeval retry_timeout;
1142 struct pmap* pm_mnt;
1147 retry_timeout.tv_sec = 3;
1148 retry_timeout.tv_usec = 0;
1149 total_timeout.tv_sec = 20;
1150 total_timeout.tv_usec = 0;
1151 timeout = time(NULL) + 60 * retry;
1155 /* be careful not to use too many CPU cycles */
1159 pm_mnt = get_mountport(&mount_server_addr,
1164 nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers;
1166 /* contact the mount daemon via TCP */
1167 mount_server_addr.sin_port = htons(pm_mnt->pm_port);
1168 msock = RPC_ANYSOCK;
1170 switch (pm_mnt->pm_prot) {
1172 mclient = clntudp_create(&mount_server_addr,
1179 mount_server_addr.sin_port = htons(pm_mnt->pm_port);
1180 msock = RPC_ANYSOCK;
1182 mclient = clnttcp_create(&mount_server_addr,
1191 if (!daemonized && prevt == 0)
1192 error_msg_rpc(clnt_spcreateerror(" "));
1194 enum clnt_stat clnt_stat;
1195 /* try to mount hostname:pathname */
1196 mclient->cl_auth = authunix_create_default();
1198 /* make pointers in xdr_mountres3 NULL so
1199 * that xdr_array allocates memory for us
1201 memset(&status, 0, sizeof(status));
1203 if (pm_mnt->pm_vers == 3)
1204 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1205 (xdrproc_t) xdr_dirpath,
1206 (caddr_t) &pathname,
1207 (xdrproc_t) xdr_mountres3,
1211 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1212 (xdrproc_t) xdr_dirpath,
1213 (caddr_t) &pathname,
1214 (xdrproc_t) xdr_fhstatus,
1218 if (clnt_stat == RPC_SUCCESS)
1219 goto prepare_kernel_data; /* we're done */
1220 if (errno != ECONNREFUSED) {
1221 error_msg_rpc(clnt_sperror(mclient, " "));
1222 goto fail; /* don't retry */
1224 /* Connection refused */
1225 if (!daemonized && prevt == 0) /* print just once */
1226 error_msg_rpc(clnt_sperror(mclient, " "));
1227 auth_destroy(mclient->cl_auth);
1228 clnt_destroy(mclient);
1233 /* Timeout. We are going to retry... maybe */
1238 daemonized = daemonize();
1239 if (daemonized <= 0) { /* parent or error */
1240 retval = -daemonized;
1247 /* TODO error message */
1253 prepare_kernel_data:
1256 if (status.nfsv2.fhs_status != 0) {
1257 bb_error_msg("%s:%s failed, reason given by server: %s",
1259 nfs_strerror(status.nfsv2.fhs_status));
1262 memcpy(data.root.data,
1263 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1265 data.root.size = NFS_FHSIZE;
1266 memcpy(data.old_root.data,
1267 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1270 fhandle3 *my_fhandle;
1271 if (status.nfsv3.fhs_status != 0) {
1272 bb_error_msg("%s:%s failed, reason given by server: %s",
1274 nfs_strerror(status.nfsv3.fhs_status));
1277 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1278 memset(data.old_root.data, 0, NFS_FHSIZE);
1279 memset(&data.root, 0, sizeof(data.root));
1280 data.root.size = my_fhandle->fhandle3_len;
1281 memcpy(data.root.data,
1282 (char *) my_fhandle->fhandle3_val,
1283 my_fhandle->fhandle3_len);
1285 data.flags |= NFS_MOUNT_VER3;
1288 /* create nfs socket for kernel */
1291 if (nfs_mount_version < 3) {
1292 bb_error_msg("NFS over TCP is not supported");
1295 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1297 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1299 bb_perror_msg("nfs socket");
1302 if (bindresvport(fsock, 0) < 0) {
1303 bb_perror_msg("nfs bindresvport");
1307 server_addr.sin_port = PMAPPORT;
1308 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1309 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1313 server_addr.sin_port = htons(port);
1315 /* prepare data structure for kernel */
1318 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1319 strncpy(data.hostname, hostname, sizeof(data.hostname));
1323 auth_destroy(mclient->cl_auth);
1324 clnt_destroy(mclient);
1328 /* We must wait until mount directory is available */
1329 struct stat statbuf;
1331 while (stat(mp->mnt_dir, &statbuf) == -1) {
1333 daemonized = daemonize();
1334 if (daemonized <= 0) { /* parent or error */
1335 retval = -daemonized;
1339 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1346 do_mount: /* perform actual mount */
1348 mp->mnt_type = (char*)"nfs";
1349 retval = mount_it_now(mp, vfsflags, (char*)&data);
1356 auth_destroy(mclient->cl_auth);
1357 clnt_destroy(mclient);
1371 #else /* !ENABLE_FEATURE_MOUNT_NFS */
1373 /* Never called. Call should be optimized out. */
1374 int nfsmount(struct mntent *mp, int vfsflags, char *filteropts);
1376 #endif /* !ENABLE_FEATURE_MOUNT_NFS */
1378 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1379 // type detection. Returns 0 for success, nonzero for failure.
1380 // NB: mp->xxx fields may be trashed on exit
1381 static int singlemount(struct mntent *mp, int ignore_busy)
1383 int rc = -1, vfsflags;
1384 char *loopFile = 0, *filteropts = 0;
1388 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1390 // Treat fstype "auto" as unspecified.
1392 if (mp->mnt_type && strcmp(mp->mnt_type,"auto") == 0)
1395 // Might this be an CIFS filesystem?
1397 if (ENABLE_FEATURE_MOUNT_CIFS
1398 && (!mp->mnt_type || strcmp(mp->mnt_type,"cifs") == 0)
1399 && (mp->mnt_fsname[0]=='/' || mp->mnt_fsname[0]=='\\')
1400 && mp->mnt_fsname[0]==mp->mnt_fsname[1]
1402 len_and_sockaddr *lsa;
1407 // Replace '/' with '\' and verify that unc points to "//server/share".
1409 for (s = mp->mnt_fsname; *s; ++s)
1410 if (*s == '/') *s = '\\';
1414 s = strrchr(mp->mnt_fsname, '\\');
1415 if (s <= mp->mnt_fsname+1) goto report_error;
1417 lsa = host2sockaddr(mp->mnt_fsname+2, 0);
1419 if (!lsa) goto report_error;
1421 // insert ip=... option into string flags.
1423 dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len);
1424 ip = xasprintf("ip=%s", dotted);
1425 parse_mount_options(ip, &filteropts);
1427 // compose new unc '\\server-ip\share'
1428 // (s => slash after hostname)
1430 mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
1433 vfsflags |= MS_MANDLOCK;
1435 mp->mnt_type = (char*)"cifs";
1436 rc = mount_it_now(mp, vfsflags, filteropts);
1437 if (ENABLE_FEATURE_CLEAN_UP) {
1438 free(mp->mnt_fsname);
1446 // Might this be an NFS filesystem?
1448 if (ENABLE_FEATURE_MOUNT_NFS
1449 && (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs"))
1450 && strchr(mp->mnt_fsname, ':') != NULL
1452 rc = nfsmount(mp, vfsflags, filteropts);
1456 // Look at the file. (Not found isn't a failure for remount, or for
1457 // a synthetic filesystem like proc or sysfs.)
1459 if (!lstat(mp->mnt_fsname, &st)
1460 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1462 // Do we need to allocate a loopback device for it?
1464 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1465 loopFile = bb_simplify_path(mp->mnt_fsname);
1467 switch (set_loop(&(mp->mnt_fsname), loopFile, 0)) {
1472 bb_error_msg( errno == EPERM || errno == EACCES
1473 ? bb_msg_perm_denied_are_you_root
1474 : "cannot setup loop device");
1478 // Autodetect bind mounts
1480 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1481 vfsflags |= MS_BIND;
1484 /* If we know the fstype (or don't need to), jump straight
1485 * to the actual mount. */
1487 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1488 rc = mount_it_now(mp, vfsflags, filteropts);
1490 // Loop through filesystem types until mount succeeds
1493 /* Initialize list of block backed filesystems. This has to be
1494 * done here so that during "mount -a", mounts after /proc shows up
1495 * can autodetect. */
1498 fslist = get_block_backed_filesystems();
1499 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1500 atexit(delete_block_backed_filesystems);
1503 for (fl = fslist; fl; fl = fl->link) {
1504 mp->mnt_type = fl->data;
1505 rc = mount_it_now(mp, vfsflags, filteropts);
1510 // If mount failed, clean up loop file (if any).
1512 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1513 del_loop(mp->mnt_fsname);
1514 if (ENABLE_FEATURE_CLEAN_UP) {
1516 free(mp->mnt_fsname);
1521 if (ENABLE_FEATURE_CLEAN_UP)
1524 if (rc && errno == EBUSY && ignore_busy) rc = 0;
1526 /* perror here sometimes says "mounting ... on ... failed: Success" */
1527 bb_error_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1532 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1533 // each directory to be mounted.
1535 const char must_be_root[] = "you must be root";
1537 int mount_main(int argc, char **argv);
1538 int mount_main(int argc, char **argv)
1540 enum { OPT_ALL = 0x10 };
1542 char *cmdopts = xstrdup(""), *fstype=0, *storage_path=0;
1544 const char *fstabname;
1548 struct mntent mtpair[2], *mtcur = mtpair;
1549 SKIP_DESKTOP(const int nonroot = 0;)
1550 USE_DESKTOP( int nonroot = (getuid() != 0);)
1552 /* parse long options, like --bind and --move. Note that -o option
1553 * and --option are synonymous. Yes, this means --remount,rw works. */
1555 for (i = j = 0; i < argc; i++) {
1556 if (argv[i][0] == '-' && argv[i][1] == '-') {
1557 append_mount_options(&cmdopts, argv[i]+2);
1558 } else argv[j++] = argv[i];
1563 // Parse remaining options
1565 opt = getopt32(argc, argv, "o:t:rwanfvs", &opt_o, &fstype);
1566 if (opt & 0x1) append_mount_options(&cmdopts, opt_o); // -o
1567 //if (opt & 0x2) // -t
1568 if (opt & 0x4) append_mount_options(&cmdopts, "ro"); // -r
1569 if (opt & 0x8) append_mount_options(&cmdopts, "rw"); // -w
1570 //if (opt & 0x10) // -a
1571 if (opt & 0x20) USE_FEATURE_MTAB_SUPPORT(useMtab = 0); // -n
1572 if (opt & 0x40) USE_FEATURE_MTAB_SUPPORT(fakeIt = 1); // -f
1573 //if (opt & 0x80) // -v: verbose (ignore)
1574 //if (opt & 0x100) // -s: sloppy (ignore)
1578 // Three or more non-option arguments? Die with a usage message.
1580 if (argc > 2) bb_show_usage();
1582 // If we have no arguments, show currently mounted filesystems
1585 if (!(opt & OPT_ALL)) {
1586 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1588 if (!mountTable) bb_error_msg_and_die("no %s", bb_path_mtab_file);
1590 while (getmntent_r(mountTable, mtpair, bb_common_bufsiz1,
1591 sizeof(bb_common_bufsiz1)))
1593 // Don't show rootfs. FIXME: why??
1594 // util-linux 2.12a happily shows rootfs...
1595 //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1597 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1598 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1599 mtpair->mnt_dir, mtpair->mnt_type,
1602 if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable);
1603 return EXIT_SUCCESS;
1605 } else storage_path = bb_simplify_path(argv[0]);
1607 // When we have two arguments, the second is the directory and we can
1608 // skip looking at fstab entirely. We can always abspath() the directory
1609 // argument when we get it.
1613 bb_error_msg_and_die(must_be_root);
1614 mtpair->mnt_fsname = argv[0];
1615 mtpair->mnt_dir = argv[1];
1616 mtpair->mnt_type = fstype;
1617 mtpair->mnt_opts = cmdopts;
1618 rc = singlemount(mtpair, 0);
1622 i = parse_mount_options(cmdopts, 0);
1623 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1624 bb_error_msg_and_die(must_be_root);
1626 // If we have a shared subtree flag, don't worry about fstab or mtab.
1628 if (ENABLE_FEATURE_MOUNT_FLAGS
1629 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1631 rc = mount("", argv[0], "", i, "");
1632 if (rc) bb_perror_msg_and_die("%s", argv[0]);
1636 // Open either fstab or mtab
1638 fstabname = "/etc/fstab";
1639 if (i & MS_REMOUNT) {
1640 fstabname = bb_path_mtab_file;
1642 fstab = setmntent(fstabname, "r");
1644 bb_perror_msg_and_die("cannot read %s", fstabname);
1646 // Loop through entries until we find what we're looking for.
1648 memset(mtpair, 0, sizeof(mtpair));
1650 struct mntent *mtnext = (mtcur==mtpair ? mtpair+1 : mtpair);
1652 // Get next fstab entry
1654 if (!getmntent_r(fstab, mtcur, bb_common_bufsiz1
1655 + (mtcur==mtpair ? sizeof(bb_common_bufsiz1)/2 : 0),
1656 sizeof(bb_common_bufsiz1)/2))
1658 // Were we looking for something specific?
1662 // If we didn't find anything, complain.
1664 if (!mtnext->mnt_fsname)
1665 bb_error_msg_and_die("can't find %s in %s",
1666 argv[0], fstabname);
1670 // fstab must have "users" or "user"
1671 if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS))
1672 bb_error_msg_and_die(must_be_root);
1675 // Mount the last thing we found.
1677 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1678 append_mount_options(&(mtcur->mnt_opts), cmdopts);
1679 rc = singlemount(mtcur, 0);
1680 free(mtcur->mnt_opts);
1685 /* If we're trying to mount something specific and this isn't it,
1686 * skip it. Note we must match both the exact text in fstab (ala
1687 * "proc") or a full path from root */
1691 // Is this what we're looking for?
1693 if (strcmp(argv[0], mtcur->mnt_fsname) &&
1694 strcmp(storage_path, mtcur->mnt_fsname) &&
1695 strcmp(argv[0], mtcur->mnt_dir) &&
1696 strcmp(storage_path, mtcur->mnt_dir)) continue;
1698 // Remember this entry. Something later may have overmounted
1699 // it, and we want the _last_ match.
1703 // If we're mounting all.
1706 // Do we need to match a filesystem type?
1707 if (fstype && match_fstype(mtcur, fstype)) continue;
1709 // Skip noauto and swap anyway.
1711 if (parse_mount_options(mtcur->mnt_opts, 0)
1712 & (MOUNT_NOAUTO | MOUNT_SWAP)) continue;
1714 // No, mount -a won't mount anything,
1715 // even user mounts, for mere humans.
1718 bb_error_msg_and_die(must_be_root);
1720 // Mount this thing.
1722 // NFS mounts want this to be xrealloc-able
1723 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1724 if (singlemount(mtcur, 1)) {
1725 /* Count number of failed mounts */
1728 free(mtcur->mnt_opts);
1731 if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
1735 if (ENABLE_FEATURE_CLEAN_UP) {