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 #define MS_SILENT (1 << 15)
37 #if defined(__dietlibc__)
38 /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
39 * dietlibc-0.30 does not have implementation of getmntent_r() */
40 struct mntent *getmntent_r(FILE* stream, struct mntent* result, char* buffer, int bufsize)
42 struct mntent* ment = getmntent(stream);
43 memcpy(result, ment, sizeof(struct mntent));
48 #define getmntent_buf bb_common_bufsiz1
51 // Not real flags, but we want to be able to check for this.
53 MOUNT_USERS = (1<<28)*ENABLE_DESKTOP,
54 MOUNT_NOAUTO = (1<<29),
57 // TODO: more "user" flag compatibility.
58 // "user" option (from mount manpage):
59 // Only the user that mounted a filesystem can unmount it again.
60 // If any user should be able to unmount, then use users instead of user
61 // in the fstab line. The owner option is similar to the user option,
62 // with the restriction that the user must be the owner of the special file.
63 // This may be useful e.g. for /dev/fd if a login script makes
64 // the console user owner of this device.
66 /* Standard mount options (from -o options or --options), with corresponding
72 } static mount_options[] = {
73 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
75 USE_FEATURE_MOUNT_LOOP(
79 USE_FEATURE_MOUNT_FSTAB(
81 /* {"quiet", 0}, - do not filter out, vfat wants to see it */
82 {"noauto", MOUNT_NOAUTO},
85 USE_DESKTOP({"user", MOUNT_USERS},)
86 USE_DESKTOP({"users", MOUNT_USERS},)
89 USE_FEATURE_MOUNT_FLAGS(
91 {"nosuid", MS_NOSUID},
96 {"noexec", MS_NOEXEC},
97 {"sync", MS_SYNCHRONOUS},
98 {"async", ~MS_SYNCHRONOUS},
99 {"atime", ~MS_NOATIME},
100 {"noatime", MS_NOATIME},
101 {"diratime", ~MS_NODIRATIME},
102 {"nodiratime", MS_NODIRATIME},
103 {"loud", ~MS_SILENT},
109 {"shared", MS_SHARED},
111 {"private", MS_PRIVATE},
112 {"unbindable", MS_UNBINDABLE},
113 {"rshared", MS_SHARED|MS_RECURSIVE},
114 {"rslave", MS_SLAVE|MS_RECURSIVE},
115 {"rprivate", MS_SLAVE|MS_RECURSIVE},
116 {"runbindable", MS_UNBINDABLE|MS_RECURSIVE},
119 // Always understood.
121 {"ro", MS_RDONLY}, // vfs flag
122 {"rw", ~MS_RDONLY}, // vfs flag
123 {"remount", MS_REMOUNT}, // action flag
127 /* Append mount options to string */
128 static void append_mount_options(char **oldopts, const char *newopts)
130 if (*oldopts && **oldopts) {
131 /* do not insert options which are already there */
134 int len = strlen(newopts);
135 p = strchr(newopts, ',');
136 if (p) len = p - newopts;
139 if (!strncmp(p, newopts, len)
140 && (p[len]==',' || p[len]==0))
146 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
151 while (newopts[0] == ',') newopts++;
154 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
155 *oldopts = xstrdup(newopts);
159 /* Use the mount_options list to parse options into flags.
160 * Also return list of unrecognized options if unrecognized!=NULL */
161 static int parse_mount_options(char *options, char **unrecognized)
163 int flags = MS_SILENT;
165 // Loop through options
168 char *comma = strchr(options, ',');
170 if (comma) *comma = 0;
172 // Find this option in mount_options
173 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
174 if (!strcasecmp(mount_options[i].name, options)) {
175 long fl = mount_options[i].flags;
176 if (fl < 0) flags &= fl;
181 // If unrecognized not NULL, append unrecognized mount options */
182 if (unrecognized && i == ARRAY_SIZE(mount_options)) {
183 // Add it to strflags, to pass on to kernel
184 i = *unrecognized ? strlen(*unrecognized) : 0;
185 *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
187 // Comma separated if it's not the first one
188 if (i) (*unrecognized)[i++] = ',';
189 strcpy((*unrecognized)+i, options);
194 // Advance to next option
202 // Return a list of all block device backed filesystems
204 static llist_t *get_block_backed_filesystems(void)
206 static const char filesystems[2][sizeof("/proc/filesystems")] = {
215 for (i = 0; i < 2; i++) {
216 f = fopen(filesystems[i], "r");
219 while ((buf = xmalloc_getline(f)) != 0) {
220 if (!strncmp(buf, "nodev", 5) && isspace(buf[5]))
222 fs = skip_whitespace(buf);
223 if (*fs=='#' || *fs=='*' || !*fs) continue;
225 llist_add_to_end(&list, xstrdup(fs));
228 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
236 #if ENABLE_FEATURE_CLEAN_UP
237 static void delete_block_backed_filesystems(void)
239 llist_free(fslist, free);
242 void delete_block_backed_filesystems(void);
245 #if ENABLE_FEATURE_MTAB_SUPPORT
246 static int useMtab = 1;
253 // Perform actual mount of specific filesystem at specific location.
254 // NB: mp->xxx fields may be trashed on exit
255 static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
259 if (fakeIt) goto mtab;
261 // Mount, with fallback to read-only if necessary.
264 rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
265 vfsflags, filteropts);
266 if (!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
268 if (!(vfsflags & MS_SILENT))
269 bb_error_msg("%s is write-protected, mounting read-only",
271 vfsflags |= MS_RDONLY;
274 // Abort entirely if permission denied.
276 if (rc && errno == EPERM)
277 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
279 /* If the mount was successful, and we're maintaining an old-style
280 * mtab file by hand, add the new entry to it now. */
282 if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
284 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
288 bb_error_msg("no %s",bb_path_mtab_file);
292 // Add vfs string flags
294 for (i=0; mount_options[i].flags != MS_REMOUNT; i++)
295 if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags))
296 append_mount_options(&(mp->mnt_opts), mount_options[i].name);
298 // Remove trailing / (if any) from directory we mounted on
300 i = strlen(mp->mnt_dir) - 1;
301 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = 0;
303 // Convert to canonical pathnames as needed
305 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
307 if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */
308 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
309 mp->mnt_type = (char*)"bind";
311 mp->mnt_freq = mp->mnt_passno = 0;
315 addmntent(mountTable, mp);
316 endmntent(mountTable);
317 if (ENABLE_FEATURE_CLEAN_UP) {
326 #if ENABLE_FEATURE_MOUNT_NFS
330 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
332 * Licensed under GPLv2, see file LICENSE in this tarball for details.
334 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
335 * numbers to be specified on the command line.
337 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
338 * Omit the call to connect() for Linux version 1.3.11 or later.
340 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
341 * Implemented the "bg", "fg" and "retry" mount options for NFS.
343 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
344 * - added Native Language Support
346 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
350 /* This is just a warning of a common mistake. Possibly this should be a
351 * uclibc faq entry rather than in busybox... */
352 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
353 #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
356 #define MOUNTPORT 635
357 #define MNTPATHLEN 1024
358 #define MNTNAMLEN 255
362 typedef char fhandle[FHSIZE];
365 unsigned int fhandle3_len;
377 MNT3ERR_NAMETOOLONG = 63,
378 MNT3ERR_NOTSUPP = 10004,
379 MNT3ERR_SERVERFAULT = 10006,
381 typedef enum mountstat3 mountstat3;
384 unsigned int fhs_status;
389 typedef struct fhstatus fhstatus;
391 struct mountres3_ok {
394 unsigned int auth_flavours_len;
395 char *auth_flavours_val;
398 typedef struct mountres3_ok mountres3_ok;
401 mountstat3 fhs_status;
403 mountres3_ok mountinfo;
406 typedef struct mountres3 mountres3;
408 typedef char *dirpath;
412 typedef struct mountbody *mountlist;
416 dirpath ml_directory;
419 typedef struct mountbody mountbody;
421 typedef struct groupnode *groups;
427 typedef struct groupnode groupnode;
429 typedef struct exportnode *exports;
436 typedef struct exportnode exportnode;
449 typedef struct ppathcnf ppathcnf;
451 #define MOUNTPROG 100005
454 #define MOUNTPROC_NULL 0
455 #define MOUNTPROC_MNT 1
456 #define MOUNTPROC_DUMP 2
457 #define MOUNTPROC_UMNT 3
458 #define MOUNTPROC_UMNTALL 4
459 #define MOUNTPROC_EXPORT 5
460 #define MOUNTPROC_EXPORTALL 6
462 #define MOUNTVERS_POSIX 2
464 #define MOUNTPROC_PATHCONF 7
468 #define MOUNTPROC3_NULL 0
469 #define MOUNTPROC3_MNT 1
470 #define MOUNTPROC3_DUMP 2
471 #define MOUNTPROC3_UMNT 3
472 #define MOUNTPROC3_UMNTALL 4
473 #define MOUNTPROC3_EXPORT 5
485 * We want to be able to compile mount on old kernels in such a way
486 * that the binary will work well on more recent kernels.
487 * Thus, if necessary we teach nfsmount.c the structure of new fields
488 * that will come later.
490 * Moreover, the new kernel includes conflict with glibc includes
491 * so it is easiest to ignore the kernel altogether (at compile time).
499 unsigned char data[64];
502 struct nfs_mount_data {
505 struct nfs2_fh old_root; /* 1 */
511 int acregmin; /* 1 */
512 int acregmax; /* 1 */
513 int acdirmin; /* 1 */
514 int acdirmax; /* 1 */
515 struct sockaddr_in addr; /* 1 */
516 char hostname[256]; /* 1 */
518 unsigned int bsize; /* 3 */
519 struct nfs3_fh root; /* 4 */
522 /* bits in the flags field */
524 NFS_MOUNT_SOFT = 0x0001, /* 1 */
525 NFS_MOUNT_INTR = 0x0002, /* 1 */
526 NFS_MOUNT_SECURE = 0x0004, /* 1 */
527 NFS_MOUNT_POSIX = 0x0008, /* 1 */
528 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
529 NFS_MOUNT_NOAC = 0x0020, /* 1 */
530 NFS_MOUNT_TCP = 0x0040, /* 2 */
531 NFS_MOUNT_VER3 = 0x0080, /* 3 */
532 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
533 NFS_MOUNT_NONLM = 0x0200 /* 3 */
538 * We need to translate between nfs status return values and
539 * the local errno values which may not be the same.
541 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
542 * "after #include <errno.h> the symbol errno is reserved for any use,
543 * it cannot even be used as a struct tag or field name".
547 #define EDQUOT ENOSPC
550 // Convert each NFSERR_BLAH into EBLAH
552 static const struct {
556 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
557 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
558 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
559 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
562 static char *nfs_strerror(int status)
565 static char buf[sizeof("unknown nfs status return value: ") + sizeof(int)*3];
567 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
568 if (nfs_errtbl[i].stat == status)
569 return strerror(nfs_errtbl[i].errnum);
571 sprintf(buf, "unknown nfs status return value: %d", status);
575 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
577 if (!xdr_opaque(xdrs, objp, FHSIZE))
582 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
584 if (!xdr_u_int(xdrs, &objp->fhs_status))
586 switch (objp->fhs_status) {
588 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
597 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
599 if (!xdr_string(xdrs, objp, MNTPATHLEN))
604 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
606 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
611 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
613 if (!xdr_fhandle3(xdrs, &objp->fhandle))
615 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
616 sizeof (int), (xdrproc_t) xdr_int))
621 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
623 if (!xdr_enum(xdrs, (enum_t *) objp))
628 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
630 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
632 switch (objp->fhs_status) {
634 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
643 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
646 * nfs_mount_version according to the sources seen at compile time.
648 static int nfs_mount_version;
649 static int kernel_version;
652 * Unfortunately, the kernel prints annoying console messages
653 * in case of an unexpected nfs mount version (instead of
654 * just returning some error). Therefore we'll have to try
655 * and figure out what version the kernel expects.
658 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
659 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
660 * nfs_mount_version: version this source and running kernel can handle
663 find_kernel_nfs_mount_version(void)
668 nfs_mount_version = 4; /* default */
670 kernel_version = get_linux_version_code();
671 if (kernel_version) {
672 if (kernel_version < KERNEL_VERSION(2,1,32))
673 nfs_mount_version = 1;
674 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
675 (kernel_version >= KERNEL_VERSION(2,3,0) &&
676 kernel_version < KERNEL_VERSION(2,3,99)))
677 nfs_mount_version = 3;
678 /* else v4 since 2.3.99pre4 */
683 get_mountport(struct sockaddr_in *server_addr,
685 long unsigned version,
689 struct pmaplist *pmap;
690 static struct pmap p = {0, 0, 0, 0};
692 server_addr->sin_port = PMAPPORT;
693 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
694 * I understand it like "IPv6 for this is not 100% ready" */
695 pmap = pmap_getmaps(server_addr);
697 if (version > MAX_NFSPROT)
698 version = MAX_NFSPROT;
707 if (pmap->pml_map.pm_prog != prog)
709 if (!version && p.pm_vers > pmap->pml_map.pm_vers)
711 if (version > 2 && pmap->pml_map.pm_vers != version)
713 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
715 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
716 (proto && p.pm_prot && pmap->pml_map.pm_prot != proto) ||
717 (port && pmap->pml_map.pm_port != port))
719 memcpy(&p, &pmap->pml_map, sizeof(p));
721 pmap = pmap->pml_next;
724 p.pm_vers = MOUNTVERS;
726 p.pm_port = MOUNTPORT;
728 p.pm_prot = IPPROTO_TCP;
733 static int daemonize(void)
737 if (pid < 0) /* error */
739 if (pid > 0) /* parent */
742 fd = xopen(bb_dev_null, O_RDWR);
746 while (fd > 2) close(fd--);
748 openlog(applet_name, LOG_PID, LOG_DAEMON);
749 logmode = LOGMODE_SYSLOG;
753 static inline int daemonize(void) { return -ENOSYS; }
757 static inline int we_saw_this_host_before(const char *hostname)
762 /* RPC strerror analogs are terminally idiotic:
763 * *mandatory* prefix and \n at end.
764 * This hopefully helps. Usage:
765 * error_msg_rpc(clnt_*error*(" ")) */
766 static void error_msg_rpc(const char *msg)
769 while (msg[0] == ' ' || msg[0] == ':') msg++;
771 while (len && msg[len-1] == '\n') len--;
772 bb_error_msg("%.*s", len, msg);
775 // NB: mp->xxx fields may be trashed on exit
776 static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts)
782 struct nfs_mount_data data;
785 struct sockaddr_in server_addr;
786 struct sockaddr_in mount_server_addr;
789 struct fhstatus nfsv2;
790 struct mountres3 nfsv3;
816 find_kernel_nfs_mount_version();
824 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
826 filteropts = xstrdup(filteropts); /* going to trash it later... */
828 hostname = xstrdup(mp->mnt_fsname);
829 /* mount_main() guarantees that ':' is there */
830 s = strchr(hostname, ':');
833 /* Ignore all but first hostname in replicated mounts
834 until they can be fully supported. (mack@sgi.com) */
835 s = strchr(hostname, ',');
838 bb_error_msg("warning: multiple hostnames not supported");
841 server_addr.sin_family = AF_INET;
842 if (!inet_aton(hostname, &server_addr.sin_addr)) {
843 hp = gethostbyname(hostname);
845 bb_herror_msg("%s", hostname);
848 if (hp->h_length > sizeof(struct in_addr)) {
849 bb_error_msg("got bad hp->h_length");
850 hp->h_length = sizeof(struct in_addr);
852 memcpy(&server_addr.sin_addr,
853 hp->h_addr, hp->h_length);
856 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
858 /* add IP address to mtab options for use when unmounting */
860 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
861 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
863 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
864 mp->mnt_opts[0] ? "," : "",
865 inet_ntoa(server_addr.sin_addr));
870 /* Set default options.
871 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
872 * let the kernel decide.
873 * timeo is filled in after we know whether it'll be TCP or UDP. */
874 memset(&data, 0, sizeof(data));
880 data.namlen = NAME_MAX;
888 retry = 10000; /* 10000 minutes ~ 1 week */
891 mountprog = MOUNTPROG;
899 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
900 char *opteq = strchr(opt, '=');
902 static const char options[] ALIGN1 =
914 /* 11 */ "mountport\0"
915 /* 12 */ "mounthost\0"
916 /* 13 */ "mountprog\0"
917 /* 14 */ "mountvers\0"
924 int val = xatoi_u(opteq + 1);
926 switch (index_in_strings(options, opt)) {
939 case 4: // "acregmin"
942 case 5: // "acregmax"
945 case 6: // "acdirmin"
948 case 7: // "acdirmax"
963 case 11: // "mountport"
966 case 12: // "mounthost"
967 mounthost = xstrndup(opteq+1,
968 strcspn(opteq+1," \t\n\r,"));
970 case 13: // "mountprog"
973 case 14: // "mountvers"
976 case 15: // "nfsprog"
979 case 16: // "nfsvers"
984 if (!strncmp(opteq+1, "tcp", 3))
986 else if (!strncmp(opteq+1, "udp", 3))
989 bb_error_msg("warning: unrecognized proto= option");
992 if (nfs_mount_version >= 2)
995 bb_error_msg("warning: option namlen is not supported\n");
997 case 20: // "addr" - ignore
1000 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1005 static const char options[] ALIGN1 =
1018 if (!strncmp(opt, "no", 2)) {
1022 switch (index_in_strings(options, opt)) {
1058 if (nfs_mount_version >= 3)
1061 bb_error_msg("warning: option nolock is not supported");
1064 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1069 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1071 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1072 | (intr ? NFS_MOUNT_INTR : 0)
1073 | (posix ? NFS_MOUNT_POSIX : 0)
1074 | (nocto ? NFS_MOUNT_NOCTO : 0)
1075 | (noac ? NFS_MOUNT_NOAC : 0);
1076 if (nfs_mount_version >= 2)
1077 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1078 if (nfs_mount_version >= 3)
1079 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1080 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1081 bb_error_msg("NFSv%d not supported", nfsvers);
1084 if (nfsvers && !mountvers)
1085 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1086 if (nfsvers && nfsvers < mountvers) {
1087 mountvers = nfsvers;
1090 /* Adjust options if none specified */
1092 data.timeo = tcp ? 70 : 7;
1094 data.version = nfs_mount_version;
1096 if (vfsflags & MS_REMOUNT)
1100 * If the previous mount operation on the same host was
1101 * backgrounded, and the "bg" for this mount is also set,
1102 * give up immediately, to avoid the initial timeout.
1104 if (bg && we_saw_this_host_before(hostname)) {
1105 daemonized = daemonize();
1106 if (daemonized <= 0) { /* parent or error */
1107 retval = -daemonized;
1112 /* create mount daemon client */
1113 /* See if the nfs host = mount host. */
1115 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1116 mount_server_addr.sin_family = AF_INET;
1117 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1119 hp = gethostbyname(mounthost);
1121 bb_herror_msg("%s", mounthost);
1124 if (hp->h_length > sizeof(struct in_addr)) {
1125 bb_error_msg("got bad hp->h_length?");
1126 hp->h_length = sizeof(struct in_addr);
1128 mount_server_addr.sin_family = AF_INET;
1129 memcpy(&mount_server_addr.sin_addr,
1130 hp->h_addr, hp->h_length);
1136 * The following loop implements the mount retries. When the mount
1137 * times out, and the "bg" option is set, we background ourself
1138 * and continue trying.
1140 * The case where the mount point is not present and the "bg"
1141 * option is set, is treated as a timeout. This is done to
1142 * support nested mounts.
1144 * The "retry" count specified by the user is the number of
1145 * minutes to retry before giving up.
1148 struct timeval total_timeout;
1149 struct timeval retry_timeout;
1150 struct pmap* pm_mnt;
1155 retry_timeout.tv_sec = 3;
1156 retry_timeout.tv_usec = 0;
1157 total_timeout.tv_sec = 20;
1158 total_timeout.tv_usec = 0;
1159 timeout = time(NULL) + 60 * retry;
1163 /* be careful not to use too many CPU cycles */
1167 pm_mnt = get_mountport(&mount_server_addr,
1172 nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers;
1174 /* contact the mount daemon via TCP */
1175 mount_server_addr.sin_port = htons(pm_mnt->pm_port);
1176 msock = RPC_ANYSOCK;
1178 switch (pm_mnt->pm_prot) {
1180 mclient = clntudp_create(&mount_server_addr,
1187 mount_server_addr.sin_port = htons(pm_mnt->pm_port);
1188 msock = RPC_ANYSOCK;
1190 mclient = clnttcp_create(&mount_server_addr,
1199 if (!daemonized && prevt == 0)
1200 error_msg_rpc(clnt_spcreateerror(" "));
1202 enum clnt_stat clnt_stat;
1203 /* try to mount hostname:pathname */
1204 mclient->cl_auth = authunix_create_default();
1206 /* make pointers in xdr_mountres3 NULL so
1207 * that xdr_array allocates memory for us
1209 memset(&status, 0, sizeof(status));
1211 if (pm_mnt->pm_vers == 3)
1212 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1213 (xdrproc_t) xdr_dirpath,
1214 (caddr_t) &pathname,
1215 (xdrproc_t) xdr_mountres3,
1219 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1220 (xdrproc_t) xdr_dirpath,
1221 (caddr_t) &pathname,
1222 (xdrproc_t) xdr_fhstatus,
1226 if (clnt_stat == RPC_SUCCESS)
1227 goto prepare_kernel_data; /* we're done */
1228 if (errno != ECONNREFUSED) {
1229 error_msg_rpc(clnt_sperror(mclient, " "));
1230 goto fail; /* don't retry */
1232 /* Connection refused */
1233 if (!daemonized && prevt == 0) /* print just once */
1234 error_msg_rpc(clnt_sperror(mclient, " "));
1235 auth_destroy(mclient->cl_auth);
1236 clnt_destroy(mclient);
1242 /* Timeout. We are going to retry... maybe */
1247 daemonized = daemonize();
1248 if (daemonized <= 0) { /* parent or error */
1249 retval = -daemonized;
1256 /* TODO error message */
1262 prepare_kernel_data:
1265 if (status.nfsv2.fhs_status != 0) {
1266 bb_error_msg("%s:%s failed, reason given by server: %s",
1268 nfs_strerror(status.nfsv2.fhs_status));
1271 memcpy(data.root.data,
1272 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1274 data.root.size = NFS_FHSIZE;
1275 memcpy(data.old_root.data,
1276 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1279 fhandle3 *my_fhandle;
1280 if (status.nfsv3.fhs_status != 0) {
1281 bb_error_msg("%s:%s failed, reason given by server: %s",
1283 nfs_strerror(status.nfsv3.fhs_status));
1286 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1287 memset(data.old_root.data, 0, NFS_FHSIZE);
1288 memset(&data.root, 0, sizeof(data.root));
1289 data.root.size = my_fhandle->fhandle3_len;
1290 memcpy(data.root.data,
1291 (char *) my_fhandle->fhandle3_val,
1292 my_fhandle->fhandle3_len);
1294 data.flags |= NFS_MOUNT_VER3;
1297 /* create nfs socket for kernel */
1300 if (nfs_mount_version < 3) {
1301 bb_error_msg("NFS over TCP is not supported");
1304 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1306 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1308 bb_perror_msg("nfs socket");
1311 if (bindresvport(fsock, 0) < 0) {
1312 bb_perror_msg("nfs bindresvport");
1316 server_addr.sin_port = PMAPPORT;
1317 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1318 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1322 server_addr.sin_port = htons(port);
1324 /* prepare data structure for kernel */
1327 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1328 strncpy(data.hostname, hostname, sizeof(data.hostname));
1332 auth_destroy(mclient->cl_auth);
1333 clnt_destroy(mclient);
1338 /* We must wait until mount directory is available */
1339 struct stat statbuf;
1341 while (stat(mp->mnt_dir, &statbuf) == -1) {
1343 daemonized = daemonize();
1344 if (daemonized <= 0) { /* parent or error */
1345 // FIXME: parent doesn't close fsock - ??!
1346 retval = -daemonized;
1350 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1357 do_mount: /* perform actual mount */
1359 mp->mnt_type = (char*)"nfs";
1360 retval = mount_it_now(mp, vfsflags, (char*)&data);
1367 auth_destroy(mclient->cl_auth);
1368 clnt_destroy(mclient);
1382 #else /* !ENABLE_FEATURE_MOUNT_NFS */
1384 /* Never called. Call should be optimized out. */
1385 int nfsmount(struct mntent *mp, int vfsflags, char *filteropts);
1387 #endif /* !ENABLE_FEATURE_MOUNT_NFS */
1389 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1390 // type detection. Returns 0 for success, nonzero for failure.
1391 // NB: mp->xxx fields may be trashed on exit
1392 static int singlemount(struct mntent *mp, int ignore_busy)
1394 int rc = -1, vfsflags;
1395 char *loopFile = 0, *filteropts = 0;
1399 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1401 // Treat fstype "auto" as unspecified.
1403 if (mp->mnt_type && strcmp(mp->mnt_type,"auto") == 0)
1406 // Might this be a virtual filesystem?
1408 if (ENABLE_FEATURE_MOUNT_HELPERS
1409 && (strchr(mp->mnt_fsname,'#'))
1411 char *s, *p, *args[35];
1413 for (s = p = mp->mnt_fsname; *s && n < 35-3; ++s) {
1414 if (s[0] == '#' && s[1] != '#') {
1421 args[n++] = mp->mnt_dir;
1423 rc = wait4pid(xspawn(args));
1427 // Might this be an CIFS filesystem?
1429 if (ENABLE_FEATURE_MOUNT_CIFS
1430 && (!mp->mnt_type || strcmp(mp->mnt_type,"cifs") == 0)
1431 && (mp->mnt_fsname[0]=='/' || mp->mnt_fsname[0]=='\\')
1432 && mp->mnt_fsname[0]==mp->mnt_fsname[1]
1434 len_and_sockaddr *lsa;
1439 // Replace '/' with '\' and verify that unc points to "//server/share".
1441 for (s = mp->mnt_fsname; *s; ++s)
1442 if (*s == '/') *s = '\\';
1446 s = strrchr(mp->mnt_fsname, '\\');
1447 if (s <= mp->mnt_fsname+1) goto report_error;
1449 lsa = host2sockaddr(mp->mnt_fsname+2, 0);
1451 if (!lsa) goto report_error;
1453 // insert ip=... option into string flags.
1455 dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa);
1456 ip = xasprintf("ip=%s", dotted);
1457 parse_mount_options(ip, &filteropts);
1459 // compose new unc '\\server-ip\share'
1460 // (s => slash after hostname)
1462 mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
1465 vfsflags |= MS_MANDLOCK;
1467 mp->mnt_type = (char*)"cifs";
1468 rc = mount_it_now(mp, vfsflags, filteropts);
1469 if (ENABLE_FEATURE_CLEAN_UP) {
1470 free(mp->mnt_fsname);
1478 // Might this be an NFS filesystem?
1480 if (ENABLE_FEATURE_MOUNT_NFS
1481 && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs"))
1482 && strchr(mp->mnt_fsname, ':') != NULL
1484 rc = nfsmount(mp, vfsflags, filteropts);
1488 // Look at the file. (Not found isn't a failure for remount, or for
1489 // a synthetic filesystem like proc or sysfs.)
1490 // (We use stat, not lstat, in order to allow
1491 // mount symlink_to_file_or_blkdev dir)
1493 if (!stat(mp->mnt_fsname, &st)
1494 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1496 // Do we need to allocate a loopback device for it?
1498 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1499 loopFile = bb_simplify_path(mp->mnt_fsname);
1500 mp->mnt_fsname = NULL; /* will receive malloced loop dev name */
1501 if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) {
1502 if (errno == EPERM || errno == EACCES)
1503 bb_error_msg(bb_msg_perm_denied_are_you_root);
1505 bb_perror_msg("cannot setup loop device");
1509 // Autodetect bind mounts
1511 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1512 vfsflags |= MS_BIND;
1515 /* If we know the fstype (or don't need to), jump straight
1516 * to the actual mount. */
1518 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1519 rc = mount_it_now(mp, vfsflags, filteropts);
1521 // Loop through filesystem types until mount succeeds
1524 /* Initialize list of block backed filesystems. This has to be
1525 * done here so that during "mount -a", mounts after /proc shows up
1526 * can autodetect. */
1529 fslist = get_block_backed_filesystems();
1530 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1531 atexit(delete_block_backed_filesystems);
1534 for (fl = fslist; fl; fl = fl->link) {
1535 mp->mnt_type = fl->data;
1536 rc = mount_it_now(mp, vfsflags, filteropts);
1541 // If mount failed, clean up loop file (if any).
1543 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1544 del_loop(mp->mnt_fsname);
1545 if (ENABLE_FEATURE_CLEAN_UP) {
1547 free(mp->mnt_fsname);
1552 if (ENABLE_FEATURE_CLEAN_UP)
1555 if (errno == EBUSY && ignore_busy)
1558 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1562 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1563 // each directory to be mounted.
1565 static const char must_be_root[] ALIGN1 = "you must be root";
1567 int mount_main(int argc, char **argv);
1568 int mount_main(int argc, char **argv)
1570 enum { OPT_ALL = 0x10 };
1572 char *cmdopts = xstrdup(""), *fstype=0, *storage_path=0;
1574 const char *fstabname;
1578 struct mntent mtpair[2], *mtcur = mtpair;
1579 SKIP_DESKTOP(const int nonroot = 0;)
1580 USE_DESKTOP( int nonroot = (getuid() != 0);)
1582 /* parse long options, like --bind and --move. Note that -o option
1583 * and --option are synonymous. Yes, this means --remount,rw works. */
1585 for (i = j = 0; i < argc; i++) {
1586 if (argv[i][0] == '-' && argv[i][1] == '-') {
1587 append_mount_options(&cmdopts, argv[i]+2);
1588 } else argv[j++] = argv[i];
1593 // Parse remaining options
1595 opt = getopt32(argv, "o:t:rwanfvsi", &opt_o, &fstype);
1596 if (opt & 0x1) append_mount_options(&cmdopts, opt_o); // -o
1597 //if (opt & 0x2) // -t
1598 if (opt & 0x4) append_mount_options(&cmdopts, "ro"); // -r
1599 if (opt & 0x8) append_mount_options(&cmdopts, "rw"); // -w
1600 //if (opt & 0x10) // -a
1601 if (opt & 0x20) USE_FEATURE_MTAB_SUPPORT(useMtab = 0); // -n
1602 if (opt & 0x40) USE_FEATURE_MTAB_SUPPORT(fakeIt = 1); // -f
1603 //if (opt & 0x80) // -v: verbose (ignore)
1604 //if (opt & 0x100) // -s: sloppy (ignore)
1605 //if (opt & 0x200) // -i: don't call mount.<fstype> (ignore)
1609 // Three or more non-option arguments? Die with a usage message.
1611 if (argc > 2) bb_show_usage();
1613 // If we have no arguments, show currently mounted filesystems
1616 if (!(opt & OPT_ALL)) {
1617 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1619 if (!mountTable) bb_error_msg_and_die("no %s", bb_path_mtab_file);
1621 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1622 sizeof(getmntent_buf)))
1624 // Don't show rootfs. FIXME: why??
1625 // util-linux 2.12a happily shows rootfs...
1626 //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1628 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1629 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1630 mtpair->mnt_dir, mtpair->mnt_type,
1633 if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable);
1634 return EXIT_SUCCESS;
1636 } else storage_path = bb_simplify_path(argv[0]);
1638 // When we have two arguments, the second is the directory and we can
1639 // skip looking at fstab entirely. We can always abspath() the directory
1640 // argument when we get it.
1644 bb_error_msg_and_die(must_be_root);
1645 mtpair->mnt_fsname = argv[0];
1646 mtpair->mnt_dir = argv[1];
1647 mtpair->mnt_type = fstype;
1648 mtpair->mnt_opts = cmdopts;
1649 rc = singlemount(mtpair, 0);
1653 i = parse_mount_options(cmdopts, 0);
1654 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1655 bb_error_msg_and_die(must_be_root);
1657 // If we have a shared subtree flag, don't worry about fstab or mtab.
1659 if (ENABLE_FEATURE_MOUNT_FLAGS
1660 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1662 rc = mount("", argv[0], "", i, "");
1663 if (rc) bb_perror_msg_and_die("%s", argv[0]);
1667 // Open either fstab or mtab
1669 fstabname = "/etc/fstab";
1670 if (i & MS_REMOUNT) {
1671 fstabname = bb_path_mtab_file;
1673 fstab = setmntent(fstabname, "r");
1675 bb_perror_msg_and_die("cannot read %s", fstabname);
1677 // Loop through entries until we find what we're looking for.
1679 memset(mtpair, 0, sizeof(mtpair));
1681 struct mntent *mtnext = (mtcur==mtpair ? mtpair+1 : mtpair);
1683 // Get next fstab entry
1685 if (!getmntent_r(fstab, mtcur, getmntent_buf
1686 + (mtcur==mtpair ? sizeof(getmntent_buf)/2 : 0),
1687 sizeof(getmntent_buf)/2))
1689 // Were we looking for something specific?
1693 // If we didn't find anything, complain.
1695 if (!mtnext->mnt_fsname)
1696 bb_error_msg_and_die("can't find %s in %s",
1697 argv[0], fstabname);
1701 // fstab must have "users" or "user"
1702 if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS))
1703 bb_error_msg_and_die(must_be_root);
1706 // Mount the last thing we found.
1708 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1709 append_mount_options(&(mtcur->mnt_opts), cmdopts);
1710 rc = singlemount(mtcur, 0);
1711 free(mtcur->mnt_opts);
1716 /* If we're trying to mount something specific and this isn't it,
1717 * skip it. Note we must match both the exact text in fstab (ala
1718 * "proc") or a full path from root */
1722 // Is this what we're looking for?
1724 if (strcmp(argv[0], mtcur->mnt_fsname) &&
1725 strcmp(storage_path, mtcur->mnt_fsname) &&
1726 strcmp(argv[0], mtcur->mnt_dir) &&
1727 strcmp(storage_path, mtcur->mnt_dir)) continue;
1729 // Remember this entry. Something later may have overmounted
1730 // it, and we want the _last_ match.
1734 // If we're mounting all.
1737 // Do we need to match a filesystem type?
1738 if (fstype && match_fstype(mtcur, fstype)) continue;
1740 // Skip noauto and swap anyway.
1742 if (parse_mount_options(mtcur->mnt_opts, 0)
1743 & (MOUNT_NOAUTO | MOUNT_SWAP)) continue;
1745 // No, mount -a won't mount anything,
1746 // even user mounts, for mere humans.
1749 bb_error_msg_and_die(must_be_root);
1751 // Mount this thing.
1753 // NFS mounts want this to be xrealloc-able
1754 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1755 if (singlemount(mtcur, 1)) {
1756 /* Count number of failed mounts */
1759 free(mtcur->mnt_opts);
1762 if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
1766 if (ENABLE_FEATURE_CLEAN_UP) {