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-rw-r--r--util-linux/mount.c1712
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diff --git a/util-linux/mount.c b/util-linux/mount.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini mount implementation for busybox
4 *
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>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 */
11
12/* Design notes: There is no spec for mount. Remind me to write one.
13
14 mount_main() calls singlemount() which calls mount_it_now().
15
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.
19*/
20
21#include "busybox.h"
22#include <mntent.h>
23
24/* Needed for nfs support only... */
25#include <syslog.h>
26#include <sys/utsname.h>
27#undef TRUE
28#undef FALSE
29#include <rpc/rpc.h>
30#include <rpc/pmap_prot.h>
31#include <rpc/pmap_clnt.h>
32
33
34// Not real flags, but we want to be able to check for this.
35enum {
36 MOUNT_USERS = (1<<28)*ENABLE_DESKTOP,
37 MOUNT_NOAUTO = (1<<29),
38 MOUNT_SWAP = (1<<30),
39};
40// TODO: more "user" flag compatibility.
41// "user" option (from mount manpage):
42// Only the user that mounted a filesystem can unmount it again.
43// If any user should be able to unmount, then use users instead of user
44// in the fstab line. The owner option is similar to the user option,
45// with the restriction that the user must be the owner of the special file.
46// This may be useful e.g. for /dev/fd if a login script makes
47// the console user owner of this device.
48
49/* Standard mount options (from -o options or --options), with corresponding
50 * flags */
51
52struct {
53 char *name;
54 long flags;
55} static mount_options[] = {
56 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
57
58 USE_FEATURE_MOUNT_LOOP(
59 {"loop", 0},
60 )
61
62 USE_FEATURE_MOUNT_FSTAB(
63 {"defaults", 0},
64 /* {"quiet", 0}, - do not filter out, vfat wants to see it */
65 {"noauto", MOUNT_NOAUTO},
66 {"swap", MOUNT_SWAP},
67 USE_DESKTOP({"user", MOUNT_USERS},)
68 USE_DESKTOP({"users", MOUNT_USERS},)
69 )
70
71 USE_FEATURE_MOUNT_FLAGS(
72 // vfs flags
73 {"nosuid", MS_NOSUID},
74 {"suid", ~MS_NOSUID},
75 {"dev", ~MS_NODEV},
76 {"nodev", MS_NODEV},
77 {"exec", ~MS_NOEXEC},
78 {"noexec", MS_NOEXEC},
79 {"sync", MS_SYNCHRONOUS},
80 {"async", ~MS_SYNCHRONOUS},
81 {"atime", ~MS_NOATIME},
82 {"noatime", MS_NOATIME},
83 {"diratime", ~MS_NODIRATIME},
84 {"nodiratime", MS_NODIRATIME},
85 {"loud", ~MS_SILENT},
86
87 // action flags
88
89 {"bind", MS_BIND},
90 {"move", MS_MOVE},
91 {"shared", MS_SHARED},
92 {"slave", MS_SLAVE},
93 {"private", MS_PRIVATE},
94 {"unbindable", MS_UNBINDABLE},
95 {"rshared", MS_SHARED|MS_RECURSIVE},
96 {"rslave", MS_SLAVE|MS_RECURSIVE},
97 {"rprivate", MS_SLAVE|MS_RECURSIVE},
98 {"runbindable", MS_UNBINDABLE|MS_RECURSIVE},
99 )
100
101 // Always understood.
102
103 {"ro", MS_RDONLY}, // vfs flag
104 {"rw", ~MS_RDONLY}, // vfs flag
105 {"remount", MS_REMOUNT}, // action flag
106};
107
108#define VECTOR_SIZE(v) (sizeof(v) / sizeof((v)[0]))
109
110/* Append mount options to string */
111static void append_mount_options(char **oldopts, char *newopts)
112{
113 if (*oldopts && **oldopts) {
114 /* do not insert options which are already there */
115 while (newopts[0]) {
116 char *p;
117 int len = strlen(newopts);
118 p = strchr(newopts, ',');
119 if (p) len = p - newopts;
120 p = *oldopts;
121 while (1) {
122 if (!strncmp(p, newopts, len)
123 && (p[len]==',' || p[len]==0))
124 goto skip;
125 p = strchr(p,',');
126 if(!p) break;
127 p++;
128 }
129 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
130 free(*oldopts);
131 *oldopts = p;
132skip:
133 newopts += len;
134 while (newopts[0] == ',') newopts++;
135 }
136 } else {
137 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
138 *oldopts = xstrdup(newopts);
139 }
140}
141
142/* Use the mount_options list to parse options into flags.
143 * Also return list of unrecognized options if unrecognized!=NULL */
144static int parse_mount_options(char *options, char **unrecognized)
145{
146 int flags = MS_SILENT;
147
148 // Loop through options
149 for (;;) {
150 int i;
151 char *comma = strchr(options, ',');
152
153 if (comma) *comma = 0;
154
155 // Find this option in mount_options
156 for (i = 0; i < VECTOR_SIZE(mount_options); i++) {
157 if (!strcasecmp(mount_options[i].name, options)) {
158 long fl = mount_options[i].flags;
159 if (fl < 0) flags &= fl;
160 else flags |= fl;
161 break;
162 }
163 }
164 // If unrecognized not NULL, append unrecognized mount options */
165 if (unrecognized && i == VECTOR_SIZE(mount_options)) {
166 // Add it to strflags, to pass on to kernel
167 i = *unrecognized ? strlen(*unrecognized) : 0;
168 *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
169
170 // Comma separated if it's not the first one
171 if (i) (*unrecognized)[i++] = ',';
172 strcpy((*unrecognized)+i, options);
173 }
174
175 // Advance to next option, or finish
176 if (comma) {
177 *comma = ',';
178 options = ++comma;
179 } else break;
180 }
181
182 return flags;
183}
184
185// Return a list of all block device backed filesystems
186
187static llist_t *get_block_backed_filesystems(void)
188{
189 static const char *const filesystems[] = {
190 "/etc/filesystems",
191 "/proc/filesystems",
192 0
193 };
194 char *fs, *buf;
195 llist_t *list = 0;
196 int i;
197 FILE *f;
198
199 for (i = 0; filesystems[i]; i++) {
200 f = fopen(filesystems[i], "r");
201 if (!f) continue;
202
203 while ((buf = xmalloc_getline(f)) != 0) {
204 if (!strncmp(buf, "nodev", 5) && isspace(buf[5]))
205 continue;
206 fs = skip_whitespace(buf);
207 if (*fs=='#' || *fs=='*' || !*fs) continue;
208
209 llist_add_to_end(&list, xstrdup(fs));
210 free(buf);
211 }
212 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
213 }
214
215 return list;
216}
217
218llist_t *fslist = 0;
219
220#if ENABLE_FEATURE_CLEAN_UP
221static void delete_block_backed_filesystems(void)
222{
223 llist_free(fslist, free);
224}
225#else
226void delete_block_backed_filesystems(void);
227#endif
228
229#if ENABLE_FEATURE_MTAB_SUPPORT
230static int useMtab = 1;
231static int fakeIt;
232#else
233#define useMtab 0
234#define fakeIt 0
235#endif
236
237// Perform actual mount of specific filesystem at specific location.
238// NB: mp->xxx fields may be trashed on exit
239static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
240{
241 int rc = 0;
242
243 if (fakeIt) goto mtab;
244
245 // Mount, with fallback to read-only if necessary.
246
247 for (;;) {
248 rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
249 vfsflags, filteropts);
250 if (!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
251 break;
252 bb_error_msg("%s is write-protected, mounting read-only",
253 mp->mnt_fsname);
254 vfsflags |= MS_RDONLY;
255 }
256
257 // Abort entirely if permission denied.
258
259 if (rc && errno == EPERM)
260 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
261
262 /* If the mount was successful, and we're maintaining an old-style
263 * mtab file by hand, add the new entry to it now. */
264 mtab:
265 if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
266 char *fsname;
267 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
268 int i;
269
270 if (!mountTable) {
271 bb_error_msg("no %s",bb_path_mtab_file);
272 goto ret;
273 }
274
275 // Add vfs string flags
276
277 for (i=0; mount_options[i].flags != MS_REMOUNT; i++)
278 if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags))
279 append_mount_options(&(mp->mnt_opts), mount_options[i].name);
280
281 // Remove trailing / (if any) from directory we mounted on
282
283 i = strlen(mp->mnt_dir) - 1;
284 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = 0;
285
286 // Convert to canonical pathnames as needed
287
288 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
289 fsname = 0;
290 if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */
291 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
292 mp->mnt_type = "bind";
293 }
294 mp->mnt_freq = mp->mnt_passno = 0;
295
296 // Write and close.
297
298 addmntent(mountTable, mp);
299 endmntent(mountTable);
300 if (ENABLE_FEATURE_CLEAN_UP) {
301 free(mp->mnt_dir);
302 free(fsname);
303 }
304 }
305 ret:
306 return rc;
307}
308
309#if ENABLE_FEATURE_MOUNT_NFS
310
311/*
312 * Linux NFS mount
313 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
314 *
315 * Licensed under GPLv2, see file LICENSE in this tarball for details.
316 *
317 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
318 * numbers to be specified on the command line.
319 *
320 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
321 * Omit the call to connect() for Linux version 1.3.11 or later.
322 *
323 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
324 * Implemented the "bg", "fg" and "retry" mount options for NFS.
325 *
326 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
327 * - added Native Language Support
328 *
329 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
330 * plus NFSv3 stuff.
331 */
332
333/* This is just a warning of a common mistake. Possibly this should be a
334 * uclibc faq entry rather than in busybox... */
335#if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
336#error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
337#endif
338
339#define MOUNTPORT 635
340#define MNTPATHLEN 1024
341#define MNTNAMLEN 255
342#define FHSIZE 32
343#define FHSIZE3 64
344
345typedef char fhandle[FHSIZE];
346
347typedef struct {
348 unsigned int fhandle3_len;
349 char *fhandle3_val;
350} fhandle3;
351
352enum mountstat3 {
353 MNT_OK = 0,
354 MNT3ERR_PERM = 1,
355 MNT3ERR_NOENT = 2,
356 MNT3ERR_IO = 5,
357 MNT3ERR_ACCES = 13,
358 MNT3ERR_NOTDIR = 20,
359 MNT3ERR_INVAL = 22,
360 MNT3ERR_NAMETOOLONG = 63,
361 MNT3ERR_NOTSUPP = 10004,
362 MNT3ERR_SERVERFAULT = 10006,
363};
364typedef enum mountstat3 mountstat3;
365
366struct fhstatus {
367 unsigned int fhs_status;
368 union {
369 fhandle fhs_fhandle;
370 } fhstatus_u;
371};
372typedef struct fhstatus fhstatus;
373
374struct mountres3_ok {
375 fhandle3 fhandle;
376 struct {
377 unsigned int auth_flavours_len;
378 char *auth_flavours_val;
379 } auth_flavours;
380};
381typedef struct mountres3_ok mountres3_ok;
382
383struct mountres3 {
384 mountstat3 fhs_status;
385 union {
386 mountres3_ok mountinfo;
387 } mountres3_u;
388};
389typedef struct mountres3 mountres3;
390
391typedef char *dirpath;
392
393typedef char *name;
394
395typedef struct mountbody *mountlist;
396
397struct mountbody {
398 name ml_hostname;
399 dirpath ml_directory;
400 mountlist ml_next;
401};
402typedef struct mountbody mountbody;
403
404typedef struct groupnode *groups;
405
406struct groupnode {
407 name gr_name;
408 groups gr_next;
409};
410typedef struct groupnode groupnode;
411
412typedef struct exportnode *exports;
413
414struct exportnode {
415 dirpath ex_dir;
416 groups ex_groups;
417 exports ex_next;
418};
419typedef struct exportnode exportnode;
420
421struct ppathcnf {
422 int pc_link_max;
423 short pc_max_canon;
424 short pc_max_input;
425 short pc_name_max;
426 short pc_path_max;
427 short pc_pipe_buf;
428 u_char pc_vdisable;
429 char pc_xxx;
430 short pc_mask[2];
431};
432typedef struct ppathcnf ppathcnf;
433
434#define MOUNTPROG 100005
435#define MOUNTVERS 1
436
437#define MOUNTPROC_NULL 0
438#define MOUNTPROC_MNT 1
439#define MOUNTPROC_DUMP 2
440#define MOUNTPROC_UMNT 3
441#define MOUNTPROC_UMNTALL 4
442#define MOUNTPROC_EXPORT 5
443#define MOUNTPROC_EXPORTALL 6
444
445#define MOUNTVERS_POSIX 2
446
447#define MOUNTPROC_PATHCONF 7
448
449#define MOUNT_V3 3
450
451#define MOUNTPROC3_NULL 0
452#define MOUNTPROC3_MNT 1
453#define MOUNTPROC3_DUMP 2
454#define MOUNTPROC3_UMNT 3
455#define MOUNTPROC3_UMNTALL 4
456#define MOUNTPROC3_EXPORT 5
457
458enum {
459#ifndef NFS_FHSIZE
460 NFS_FHSIZE = 32,
461#endif
462#ifndef NFS_PORT
463 NFS_PORT = 2049
464#endif
465};
466
467/*
468 * We want to be able to compile mount on old kernels in such a way
469 * that the binary will work well on more recent kernels.
470 * Thus, if necessary we teach nfsmount.c the structure of new fields
471 * that will come later.
472 *
473 * Moreover, the new kernel includes conflict with glibc includes
474 * so it is easiest to ignore the kernel altogether (at compile time).
475 */
476
477struct nfs2_fh {
478 char data[32];
479};
480struct nfs3_fh {
481 unsigned short size;
482 unsigned char data[64];
483};
484
485struct nfs_mount_data {
486 int version; /* 1 */
487 int fd; /* 1 */
488 struct nfs2_fh old_root; /* 1 */
489 int flags; /* 1 */
490 int rsize; /* 1 */
491 int wsize; /* 1 */
492 int timeo; /* 1 */
493 int retrans; /* 1 */
494 int acregmin; /* 1 */
495 int acregmax; /* 1 */
496 int acdirmin; /* 1 */
497 int acdirmax; /* 1 */
498 struct sockaddr_in addr; /* 1 */
499 char hostname[256]; /* 1 */
500 int namlen; /* 2 */
501 unsigned int bsize; /* 3 */
502 struct nfs3_fh root; /* 4 */
503};
504
505/* bits in the flags field */
506enum {
507 NFS_MOUNT_SOFT = 0x0001, /* 1 */
508 NFS_MOUNT_INTR = 0x0002, /* 1 */
509 NFS_MOUNT_SECURE = 0x0004, /* 1 */
510 NFS_MOUNT_POSIX = 0x0008, /* 1 */
511 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
512 NFS_MOUNT_NOAC = 0x0020, /* 1 */
513 NFS_MOUNT_TCP = 0x0040, /* 2 */
514 NFS_MOUNT_VER3 = 0x0080, /* 3 */
515 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
516 NFS_MOUNT_NONLM = 0x0200 /* 3 */
517};
518
519
520/*
521 * We need to translate between nfs status return values and
522 * the local errno values which may not be the same.
523 *
524 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
525 * "after #include <errno.h> the symbol errno is reserved for any use,
526 * it cannot even be used as a struct tag or field name".
527 */
528
529#ifndef EDQUOT
530#define EDQUOT ENOSPC
531#endif
532
533// Convert each NFSERR_BLAH into EBLAH
534
535static const struct {
536 int stat;
537 int errnum;
538} nfs_errtbl[] = {
539 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
540 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
541 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
542 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
543};
544
545static char *nfs_strerror(int status)
546{
547 int i;
548 static char buf[sizeof("unknown nfs status return value: ") + sizeof(int)*3];
549
550 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
551 if (nfs_errtbl[i].stat == status)
552 return strerror(nfs_errtbl[i].errnum);
553 }
554 sprintf(buf, "unknown nfs status return value: %d", status);
555 return buf;
556}
557
558static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
559{
560 if (!xdr_opaque(xdrs, objp, FHSIZE))
561 return FALSE;
562 return TRUE;
563}
564
565static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
566{
567 if (!xdr_u_int(xdrs, &objp->fhs_status))
568 return FALSE;
569 switch (objp->fhs_status) {
570 case 0:
571 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
572 return FALSE;
573 break;
574 default:
575 break;
576 }
577 return TRUE;
578}
579
580static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
581{
582 if (!xdr_string(xdrs, objp, MNTPATHLEN))
583 return FALSE;
584 return TRUE;
585}
586
587static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
588{
589 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
590 return FALSE;
591 return TRUE;
592}
593
594static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
595{
596 if (!xdr_fhandle3(xdrs, &objp->fhandle))
597 return FALSE;
598 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
599 sizeof (int), (xdrproc_t) xdr_int))
600 return FALSE;
601 return TRUE;
602}
603
604static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
605{
606 if (!xdr_enum(xdrs, (enum_t *) objp))
607 return FALSE;
608 return TRUE;
609}
610
611static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
612{
613 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
614 return FALSE;
615 switch (objp->fhs_status) {
616 case MNT_OK:
617 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
618 return FALSE;
619 break;
620 default:
621 break;
622 }
623 return TRUE;
624}
625
626#define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
627
628/*
629 * nfs_mount_version according to the sources seen at compile time.
630 */
631static int nfs_mount_version;
632static int kernel_version;
633
634/*
635 * Unfortunately, the kernel prints annoying console messages
636 * in case of an unexpected nfs mount version (instead of
637 * just returning some error). Therefore we'll have to try
638 * and figure out what version the kernel expects.
639 *
640 * Variables:
641 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
642 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
643 * nfs_mount_version: version this source and running kernel can handle
644 */
645static void
646find_kernel_nfs_mount_version(void)
647{
648 if (kernel_version)
649 return;
650
651 nfs_mount_version = 4; /* default */
652
653 kernel_version = get_linux_version_code();
654 if (kernel_version) {
655 if (kernel_version < KERNEL_VERSION(2,1,32))
656 nfs_mount_version = 1;
657 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
658 (kernel_version >= KERNEL_VERSION(2,3,0) &&
659 kernel_version < KERNEL_VERSION(2,3,99)))
660 nfs_mount_version = 3;
661 /* else v4 since 2.3.99pre4 */
662 }
663}
664
665static struct pmap *
666get_mountport(struct sockaddr_in *server_addr,
667 long unsigned prog,
668 long unsigned version,
669 long unsigned proto,
670 long unsigned port)
671{
672 struct pmaplist *pmap;
673 static struct pmap p = {0, 0, 0, 0};
674
675 server_addr->sin_port = PMAPPORT;
676 pmap = pmap_getmaps(server_addr);
677
678 if (version > MAX_NFSPROT)
679 version = MAX_NFSPROT;
680 if (!prog)
681 prog = MOUNTPROG;
682 p.pm_prog = prog;
683 p.pm_vers = version;
684 p.pm_prot = proto;
685 p.pm_port = port;
686
687 while (pmap) {
688 if (pmap->pml_map.pm_prog != prog)
689 goto next;
690 if (!version && p.pm_vers > pmap->pml_map.pm_vers)
691 goto next;
692 if (version > 2 && pmap->pml_map.pm_vers != version)
693 goto next;
694 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
695 goto next;
696 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
697 (proto && p.pm_prot && pmap->pml_map.pm_prot != proto) ||
698 (port && pmap->pml_map.pm_port != port))
699 goto next;
700 memcpy(&p, &pmap->pml_map, sizeof(p));
701next:
702 pmap = pmap->pml_next;
703 }
704 if (!p.pm_vers)
705 p.pm_vers = MOUNTVERS;
706 if (!p.pm_port)
707 p.pm_port = MOUNTPORT;
708 if (!p.pm_prot)
709 p.pm_prot = IPPROTO_TCP;
710 return &p;
711}
712
713static int daemonize(void)
714{
715 int fd;
716 int pid = fork();
717 if (pid < 0) /* error */
718 return -errno;
719 if (pid > 0) /* parent */
720 return 0;
721 /* child */
722 fd = xopen(bb_dev_null, O_RDWR);
723 dup2(fd, 0);
724 dup2(fd, 1);
725 dup2(fd, 2);
726 if (fd > 2) close(fd);
727 setsid();
728 openlog(applet_name, LOG_PID, LOG_DAEMON);
729 logmode = LOGMODE_SYSLOG;
730 return 1;
731}
732
733// TODO
734static inline int we_saw_this_host_before(const char *hostname)
735{
736 return 0;
737}
738
739/* RPC strerror analogs are terminally idiotic:
740 * *mandatory* prefix and \n at end.
741 * This hopefully helps. Usage:
742 * error_msg_rpc(clnt_*error*(" ")) */
743static void error_msg_rpc(const char *msg)
744{
745 int len;
746 while (msg[0] == ' ' || msg[0] == ':') msg++;
747 len = strlen(msg);
748 while (len && msg[len-1] == '\n') len--;
749 bb_error_msg("%.*s", len, msg);
750}
751
752// NB: mp->xxx fields may be trashed on exit
753static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts)
754{
755 CLIENT *mclient;
756 char *hostname;
757 char *pathname;
758 char *mounthost;
759 struct nfs_mount_data data;
760 char *opt;
761 struct hostent *hp;
762 struct sockaddr_in server_addr;
763 struct sockaddr_in mount_server_addr;
764 int msock, fsock;
765 union {
766 struct fhstatus nfsv2;
767 struct mountres3 nfsv3;
768 } status;
769 int daemonized;
770 char *s;
771 int port;
772 int mountport;
773 int proto;
774 int bg;
775 int soft;
776 int intr;
777 int posix;
778 int nocto;
779 int noac;
780 int nolock;
781 int retry;
782 int tcp;
783 int mountprog;
784 int mountvers;
785 int nfsprog;
786 int nfsvers;
787 int retval;
788
789 find_kernel_nfs_mount_version();
790
791 daemonized = 0;
792 mounthost = NULL;
793 retval = ETIMEDOUT;
794 msock = fsock = -1;
795 mclient = NULL;
796
797 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
798
799 filteropts = xstrdup(filteropts); /* going to trash it later... */
800
801 hostname = xstrdup(mp->mnt_fsname);
802 /* mount_main() guarantees that ':' is there */
803 s = strchr(hostname, ':');
804 pathname = s + 1;
805 *s = '\0';
806 /* Ignore all but first hostname in replicated mounts
807 until they can be fully supported. (mack@sgi.com) */
808 s = strchr(hostname, ',');
809 if (s) {
810 *s = '\0';
811 bb_error_msg("warning: multiple hostnames not supported");
812 }
813
814 server_addr.sin_family = AF_INET;
815 if (!inet_aton(hostname, &server_addr.sin_addr)) {
816 hp = gethostbyname(hostname);
817 if (hp == NULL) {
818 bb_herror_msg("%s", hostname);
819 goto fail;
820 }
821 if (hp->h_length > sizeof(struct in_addr)) {
822 bb_error_msg("got bad hp->h_length");
823 hp->h_length = sizeof(struct in_addr);
824 }
825 memcpy(&server_addr.sin_addr,
826 hp->h_addr, hp->h_length);
827 }
828
829 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
830
831 /* add IP address to mtab options for use when unmounting */
832
833 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
834 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
835 } else {
836 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
837 mp->mnt_opts[0] ? "," : "",
838 inet_ntoa(server_addr.sin_addr));
839 free(mp->mnt_opts);
840 mp->mnt_opts = tmp;
841 }
842
843 /* Set default options.
844 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
845 * let the kernel decide.
846 * timeo is filled in after we know whether it'll be TCP or UDP. */
847 memset(&data, 0, sizeof(data));
848 data.retrans = 3;
849 data.acregmin = 3;
850 data.acregmax = 60;
851 data.acdirmin = 30;
852 data.acdirmax = 60;
853 data.namlen = NAME_MAX;
854
855 bg = 0;
856 soft = 0;
857 intr = 0;
858 posix = 0;
859 nocto = 0;
860 nolock = 0;
861 noac = 0;
862 retry = 10000; /* 10000 minutes ~ 1 week */
863 tcp = 0;
864
865 mountprog = MOUNTPROG;
866 mountvers = 0;
867 port = 0;
868 mountport = 0;
869 nfsprog = 100003;
870 nfsvers = 0;
871
872 /* parse options */
873
874 for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
875 char *opteq = strchr(opt, '=');
876 if (opteq) {
877 const char *const options[] = {
878 /* 0 */ "rsize",
879 /* 1 */ "wsize",
880 /* 2 */ "timeo",
881 /* 3 */ "retrans",
882 /* 4 */ "acregmin",
883 /* 5 */ "acregmax",
884 /* 6 */ "acdirmin",
885 /* 7 */ "acdirmax",
886 /* 8 */ "actimeo",
887 /* 9 */ "retry",
888 /* 10 */ "port",
889 /* 11 */ "mountport",
890 /* 12 */ "mounthost",
891 /* 13 */ "mountprog",
892 /* 14 */ "mountvers",
893 /* 15 */ "nfsprog",
894 /* 16 */ "nfsvers",
895 /* 17 */ "vers",
896 /* 18 */ "proto",
897 /* 19 */ "namlen",
898 /* 20 */ "addr",
899 NULL
900 };
901 int val = xatoi_u(opteq + 1);
902 *opteq = '\0';
903 switch (index_in_str_array(options, opt)) {
904 case 0: // "rsize"
905 data.rsize = val;
906 break;
907 case 1: // "wsize"
908 data.wsize = val;
909 break;
910 case 2: // "timeo"
911 data.timeo = val;
912 break;
913 case 3: // "retrans"
914 data.retrans = val;
915 break;
916 case 4: // "acregmin"
917 data.acregmin = val;
918 break;
919 case 5: // "acregmax"
920 data.acregmax = val;
921 break;
922 case 6: // "acdirmin"
923 data.acdirmin = val;
924 break;
925 case 7: // "acdirmax"
926 data.acdirmax = val;
927 break;
928 case 8: // "actimeo"
929 data.acregmin = val;
930 data.acregmax = val;
931 data.acdirmin = val;
932 data.acdirmax = val;
933 break;
934 case 9: // "retry"
935 retry = val;
936 break;
937 case 10: // "port"
938 port = val;
939 break;
940 case 11: // "mountport"
941 mountport = val;
942 break;
943 case 12: // "mounthost"
944 mounthost = xstrndup(opteq+1,
945 strcspn(opteq+1," \t\n\r,"));
946 break;
947 case 13: // "mountprog"
948 mountprog = val;
949 break;
950 case 14: // "mountvers"
951 mountvers = val;
952 break;
953 case 15: // "nfsprog"
954 nfsprog = val;
955 break;
956 case 16: // "nfsvers"
957 case 17: // "vers"
958 nfsvers = val;
959 break;
960 case 18: // "proto"
961 if (!strncmp(opteq+1, "tcp", 3))
962 tcp = 1;
963 else if (!strncmp(opteq+1, "udp", 3))
964 tcp = 0;
965 else
966 bb_error_msg("warning: unrecognized proto= option");
967 break;
968 case 19: // "namlen"
969 if (nfs_mount_version >= 2)
970 data.namlen = val;
971 else
972 bb_error_msg("warning: option namlen is not supported\n");
973 break;
974 case 20: // "addr" - ignore
975 break;
976 default:
977 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
978 goto fail;
979 }
980 }
981 else {
982 const char *const options[] = {
983 "bg",
984 "fg",
985 "soft",
986 "hard",
987 "intr",
988 "posix",
989 "cto",
990 "ac",
991 "tcp",
992 "udp",
993 "lock",
994 NULL
995 };
996 int val = 1;
997 if (!strncmp(opt, "no", 2)) {
998 val = 0;
999 opt += 2;
1000 }
1001 switch (index_in_str_array(options, opt)) {
1002 case 0: // "bg"
1003 bg = val;
1004 break;
1005 case 1: // "fg"
1006 bg = !val;
1007 break;
1008 case 2: // "soft"
1009 soft = val;
1010 break;
1011 case 3: // "hard"
1012 soft = !val;
1013 break;
1014 case 4: // "intr"
1015 intr = val;
1016 break;
1017 case 5: // "posix"
1018 posix = val;
1019 break;
1020 case 6: // "cto"
1021 nocto = !val;
1022 break;
1023 case 7: // "ac"
1024 noac = !val;
1025 break;
1026 case 8: // "tcp"
1027 tcp = val;
1028 break;
1029 case 9: // "udp"
1030 tcp = !val;
1031 break;
1032 case 10: // "lock"
1033 if (nfs_mount_version >= 3)
1034 nolock = !val;
1035 else
1036 bb_error_msg("warning: option nolock is not supported");
1037 break;
1038 default:
1039 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1040 goto fail;
1041 }
1042 }
1043 }
1044 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1045
1046 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1047 | (intr ? NFS_MOUNT_INTR : 0)
1048 | (posix ? NFS_MOUNT_POSIX : 0)
1049 | (nocto ? NFS_MOUNT_NOCTO : 0)
1050 | (noac ? NFS_MOUNT_NOAC : 0);
1051 if (nfs_mount_version >= 2)
1052 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1053 if (nfs_mount_version >= 3)
1054 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1055 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1056 bb_error_msg("NFSv%d not supported", nfsvers);
1057 goto fail;
1058 }
1059 if (nfsvers && !mountvers)
1060 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1061 if (nfsvers && nfsvers < mountvers) {
1062 mountvers = nfsvers;
1063 }
1064
1065 /* Adjust options if none specified */
1066 if (!data.timeo)
1067 data.timeo = tcp ? 70 : 7;
1068
1069 data.version = nfs_mount_version;
1070
1071 if (vfsflags & MS_REMOUNT)
1072 goto do_mount;
1073
1074 /*
1075 * If the previous mount operation on the same host was
1076 * backgrounded, and the "bg" for this mount is also set,
1077 * give up immediately, to avoid the initial timeout.
1078 */
1079 if (bg && we_saw_this_host_before(hostname)) {
1080 daemonized = daemonize(); /* parent or error */
1081 if (daemonized <= 0) { /* parent or error */
1082 retval = -daemonized;
1083 goto ret;
1084 }
1085 }
1086
1087 /* create mount daemon client */
1088 /* See if the nfs host = mount host. */
1089 if (mounthost) {
1090 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1091 mount_server_addr.sin_family = AF_INET;
1092 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1093 } else {
1094 hp = gethostbyname(mounthost);
1095 if (hp == NULL) {
1096 bb_herror_msg("%s", mounthost);
1097 goto fail;
1098 } else {
1099 if (hp->h_length > sizeof(struct in_addr)) {
1100 bb_error_msg("got bad hp->h_length?");
1101 hp->h_length = sizeof(struct in_addr);
1102 }
1103 mount_server_addr.sin_family = AF_INET;
1104 memcpy(&mount_server_addr.sin_addr,
1105 hp->h_addr, hp->h_length);
1106 }
1107 }
1108 }
1109
1110 /*
1111 * The following loop implements the mount retries. When the mount
1112 * times out, and the "bg" option is set, we background ourself
1113 * and continue trying.
1114 *
1115 * The case where the mount point is not present and the "bg"
1116 * option is set, is treated as a timeout. This is done to
1117 * support nested mounts.
1118 *
1119 * The "retry" count specified by the user is the number of
1120 * minutes to retry before giving up.
1121 */
1122 {
1123 struct timeval total_timeout;
1124 struct timeval retry_timeout;
1125 struct pmap* pm_mnt;
1126 time_t t;
1127 time_t prevt;
1128 time_t timeout;
1129
1130 retry_timeout.tv_sec = 3;
1131 retry_timeout.tv_usec = 0;
1132 total_timeout.tv_sec = 20;
1133 total_timeout.tv_usec = 0;
1134 timeout = time(NULL) + 60 * retry;
1135 prevt = 0;
1136 t = 30;
1137retry:
1138 /* be careful not to use too many CPU cycles */
1139 if (t - prevt < 30)
1140 sleep(30);
1141
1142 pm_mnt = get_mountport(&mount_server_addr,
1143 mountprog,
1144 mountvers,
1145 proto,
1146 mountport);
1147 nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers;
1148
1149 /* contact the mount daemon via TCP */
1150 mount_server_addr.sin_port = htons(pm_mnt->pm_port);
1151 msock = RPC_ANYSOCK;
1152
1153 switch (pm_mnt->pm_prot) {
1154 case IPPROTO_UDP:
1155 mclient = clntudp_create(&mount_server_addr,
1156 pm_mnt->pm_prog,
1157 pm_mnt->pm_vers,
1158 retry_timeout,
1159 &msock);
1160 if (mclient)
1161 break;
1162 mount_server_addr.sin_port = htons(pm_mnt->pm_port);
1163 msock = RPC_ANYSOCK;
1164 case IPPROTO_TCP:
1165 mclient = clnttcp_create(&mount_server_addr,
1166 pm_mnt->pm_prog,
1167 pm_mnt->pm_vers,
1168 &msock, 0, 0);
1169 break;
1170 default:
1171 mclient = 0;
1172 }
1173 if (!mclient) {
1174 if (!daemonized && prevt == 0)
1175 error_msg_rpc(clnt_spcreateerror(" "));
1176 } else {
1177 enum clnt_stat clnt_stat;
1178 /* try to mount hostname:pathname */
1179 mclient->cl_auth = authunix_create_default();
1180
1181 /* make pointers in xdr_mountres3 NULL so
1182 * that xdr_array allocates memory for us
1183 */
1184 memset(&status, 0, sizeof(status));
1185
1186 if (pm_mnt->pm_vers == 3)
1187 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1188 (xdrproc_t) xdr_dirpath,
1189 (caddr_t) &pathname,
1190 (xdrproc_t) xdr_mountres3,
1191 (caddr_t) &status,
1192 total_timeout);
1193 else
1194 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1195 (xdrproc_t) xdr_dirpath,
1196 (caddr_t) &pathname,
1197 (xdrproc_t) xdr_fhstatus,
1198 (caddr_t) &status,
1199 total_timeout);
1200
1201 if (clnt_stat == RPC_SUCCESS)
1202 goto prepare_kernel_data; /* we're done */
1203 if (errno != ECONNREFUSED) {
1204 error_msg_rpc(clnt_sperror(mclient, " "));
1205 goto fail; /* don't retry */
1206 }
1207 /* Connection refused */
1208 if (!daemonized && prevt == 0) /* print just once */
1209 error_msg_rpc(clnt_sperror(mclient, " "));
1210 auth_destroy(mclient->cl_auth);
1211 clnt_destroy(mclient);
1212 mclient = 0;
1213 close(msock);
1214 }
1215
1216 /* Timeout. We are going to retry... maybe */
1217
1218 if (!bg)
1219 goto fail;
1220 if (!daemonized) {
1221 daemonized = daemonize();
1222 if (daemonized <= 0) { /* parent or error */
1223 retval = -daemonized;
1224 goto ret;
1225 }
1226 }
1227 prevt = t;
1228 t = time(NULL);
1229 if (t >= timeout)
1230 /* TODO error message */
1231 goto fail;
1232
1233 goto retry;
1234 }
1235
1236prepare_kernel_data:
1237
1238 if (nfsvers == 2) {
1239 if (status.nfsv2.fhs_status != 0) {
1240 bb_error_msg("%s:%s failed, reason given by server: %s",
1241 hostname, pathname,
1242 nfs_strerror(status.nfsv2.fhs_status));
1243 goto fail;
1244 }
1245 memcpy(data.root.data,
1246 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1247 NFS_FHSIZE);
1248 data.root.size = NFS_FHSIZE;
1249 memcpy(data.old_root.data,
1250 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1251 NFS_FHSIZE);
1252 } else {
1253 fhandle3 *my_fhandle;
1254 if (status.nfsv3.fhs_status != 0) {
1255 bb_error_msg("%s:%s failed, reason given by server: %s",
1256 hostname, pathname,
1257 nfs_strerror(status.nfsv3.fhs_status));
1258 goto fail;
1259 }
1260 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1261 memset(data.old_root.data, 0, NFS_FHSIZE);
1262 memset(&data.root, 0, sizeof(data.root));
1263 data.root.size = my_fhandle->fhandle3_len;
1264 memcpy(data.root.data,
1265 (char *) my_fhandle->fhandle3_val,
1266 my_fhandle->fhandle3_len);
1267
1268 data.flags |= NFS_MOUNT_VER3;
1269 }
1270
1271 /* create nfs socket for kernel */
1272
1273 if (tcp) {
1274 if (nfs_mount_version < 3) {
1275 bb_error_msg("NFS over TCP is not supported");
1276 goto fail;
1277 }
1278 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1279 } else
1280 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1281 if (fsock < 0) {
1282 bb_perror_msg("nfs socket");
1283 goto fail;
1284 }
1285 if (bindresvport(fsock, 0) < 0) {
1286 bb_perror_msg("nfs bindresvport");
1287 goto fail;
1288 }
1289 if (port == 0) {
1290 server_addr.sin_port = PMAPPORT;
1291 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1292 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1293 if (port == 0)
1294 port = NFS_PORT;
1295 }
1296 server_addr.sin_port = htons(port);
1297
1298 /* prepare data structure for kernel */
1299
1300 data.fd = fsock;
1301 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1302 strncpy(data.hostname, hostname, sizeof(data.hostname));
1303
1304 /* clean up */
1305
1306 auth_destroy(mclient->cl_auth);
1307 clnt_destroy(mclient);
1308 close(msock);
1309
1310 if (bg) {
1311 /* We must wait until mount directory is available */
1312 struct stat statbuf;
1313 int delay = 1;
1314 while (stat(mp->mnt_dir, &statbuf) == -1) {
1315 if (!daemonized) {
1316 daemonized = daemonize();
1317 if (daemonized <= 0) { /* parent or error */
1318 retval = -daemonized;
1319 goto ret;
1320 }
1321 }
1322 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1323 delay *= 2;
1324 if (delay > 30)
1325 delay = 30;
1326 }
1327 }
1328
1329do_mount: /* perform actual mount */
1330
1331 mp->mnt_type = "nfs";
1332 retval = mount_it_now(mp, vfsflags, (char*)&data);
1333 goto ret;
1334
1335fail: /* abort */
1336
1337 if (msock != -1) {
1338 if (mclient) {
1339 auth_destroy(mclient->cl_auth);
1340 clnt_destroy(mclient);
1341 }
1342 close(msock);
1343 }
1344 if (fsock != -1)
1345 close(fsock);
1346
1347ret:
1348 free(hostname);
1349 free(mounthost);
1350 free(filteropts);
1351 return retval;
1352}
1353
1354#else /* !ENABLE_FEATURE_MOUNT_NFS */
1355
1356/* Never called. Call should be optimized out. */
1357int nfsmount(struct mntent *mp, int vfsflags, char *filteropts);
1358
1359#endif /* !ENABLE_FEATURE_MOUNT_NFS */
1360
1361// Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1362// type detection. Returns 0 for success, nonzero for failure.
1363// NB: mp->xxx fields may be trashed on exit
1364static int singlemount(struct mntent *mp, int ignore_busy)
1365{
1366 int rc = -1, vfsflags;
1367 char *loopFile = 0, *filteropts = 0;
1368 llist_t *fl = 0;
1369 struct stat st;
1370
1371 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1372
1373 // Treat fstype "auto" as unspecified.
1374
1375 if (mp->mnt_type && !strcmp(mp->mnt_type,"auto")) mp->mnt_type = 0;
1376
1377 // Might this be an CIFS filesystem?
1378
1379 if (ENABLE_FEATURE_MOUNT_CIFS &&
1380 (!mp->mnt_type || !strcmp(mp->mnt_type,"cifs")) &&
1381 (mp->mnt_fsname[0]==mp->mnt_fsname[1] && (mp->mnt_fsname[0]=='/' || mp->mnt_fsname[0]=='\\')))
1382 {
1383 struct hostent *he;
1384 char ip[32], *s;
1385
1386 rc = 1;
1387 // Replace '/' with '\' and verify that unc points to "//server/share".
1388
1389 for (s = mp->mnt_fsname; *s; ++s)
1390 if (*s == '/') *s = '\\';
1391
1392 // get server IP
1393
1394 s = strrchr(mp->mnt_fsname, '\\');
1395 if (s == mp->mnt_fsname+1) goto report_error;
1396 *s = 0;
1397 he = gethostbyname(mp->mnt_fsname+2);
1398 *s = '\\';
1399 if (!he) goto report_error;
1400
1401 // Insert ip=... option into string flags. (NOTE: Add IPv6 support.)
1402
1403 sprintf(ip, "ip=%d.%d.%d.%d", he->h_addr[0], he->h_addr[1],
1404 he->h_addr[2], he->h_addr[3]);
1405 parse_mount_options(ip, &filteropts);
1406
1407 // compose new unc '\\server-ip\share'
1408
1409 mp->mnt_fsname = xasprintf("\\\\%s%s", ip+3,
1410 strchr(mp->mnt_fsname+2,'\\'));
1411
1412 // lock is required
1413 vfsflags |= MS_MANDLOCK;
1414
1415 mp->mnt_type = "cifs";
1416 rc = mount_it_now(mp, vfsflags, filteropts);
1417 if (ENABLE_FEATURE_CLEAN_UP) free(mp->mnt_fsname);
1418 goto report_error;
1419 }
1420
1421 // Might this be an NFS filesystem?
1422
1423 if (ENABLE_FEATURE_MOUNT_NFS &&
1424 (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs")) &&
1425 strchr(mp->mnt_fsname, ':') != NULL)
1426 {
1427 rc = nfsmount(mp, vfsflags, filteropts);
1428 goto report_error;
1429 }
1430
1431 // Look at the file. (Not found isn't a failure for remount, or for
1432 // a synthetic filesystem like proc or sysfs.)
1433
1434 if (!lstat(mp->mnt_fsname, &st) && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1435 {
1436 // Do we need to allocate a loopback device for it?
1437
1438 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1439 loopFile = bb_simplify_path(mp->mnt_fsname);
1440 mp->mnt_fsname = 0;
1441 switch (set_loop(&(mp->mnt_fsname), loopFile, 0)) {
1442 case 0:
1443 case 1:
1444 break;
1445 default:
1446 bb_error_msg( errno == EPERM || errno == EACCES
1447 ? bb_msg_perm_denied_are_you_root
1448 : "cannot setup loop device");
1449 return errno;
1450 }
1451
1452 // Autodetect bind mounts
1453
1454 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1455 vfsflags |= MS_BIND;
1456 }
1457
1458 /* If we know the fstype (or don't need to), jump straight
1459 * to the actual mount. */
1460
1461 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1462 rc = mount_it_now(mp, vfsflags, filteropts);
1463
1464 // Loop through filesystem types until mount succeeds or we run out
1465
1466 else {
1467
1468 /* Initialize list of block backed filesystems. This has to be
1469 * done here so that during "mount -a", mounts after /proc shows up
1470 * can autodetect. */
1471
1472 if (!fslist) {
1473 fslist = get_block_backed_filesystems();
1474 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1475 atexit(delete_block_backed_filesystems);
1476 }
1477
1478 for (fl = fslist; fl; fl = fl->link) {
1479 mp->mnt_type = fl->data;
1480 rc = mount_it_now(mp, vfsflags, filteropts);
1481 if (!rc) break;
1482 }
1483 }
1484
1485 // If mount failed, clean up loop file (if any).
1486
1487 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1488 del_loop(mp->mnt_fsname);
1489 if (ENABLE_FEATURE_CLEAN_UP) {
1490 free(loopFile);
1491 free(mp->mnt_fsname);
1492 }
1493 }
1494
1495report_error:
1496 if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
1497
1498 if (rc && errno == EBUSY && ignore_busy) rc = 0;
1499 if (rc < 0)
1500 /* perror here sometimes says "mounting ... on ... failed: Success" */
1501 bb_error_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1502
1503 return rc;
1504}
1505
1506// Parse options, if necessary parse fstab/mtab, and call singlemount for
1507// each directory to be mounted.
1508
1509const char must_be_root[] = "you must be root";
1510
1511int mount_main(int argc, char **argv)
1512{
1513 enum { OPT_ALL = 0x10 };
1514
1515 char *cmdopts = xstrdup(""), *fstype=0, *storage_path=0;
1516 char *opt_o;
1517 const char *fstabname;
1518 FILE *fstab;
1519 int i, j, rc = 0;
1520 unsigned opt;
1521 struct mntent mtpair[2], *mtcur = mtpair;
1522 SKIP_DESKTOP(const int nonroot = 0;)
1523 USE_DESKTOP( int nonroot = (getuid() != 0);)
1524
1525 /* parse long options, like --bind and --move. Note that -o option
1526 * and --option are synonymous. Yes, this means --remount,rw works. */
1527
1528 for (i = j = 0; i < argc; i++) {
1529 if (argv[i][0] == '-' && argv[i][1] == '-') {
1530 append_mount_options(&cmdopts, argv[i]+2);
1531 } else argv[j++] = argv[i];
1532 }
1533 argv[j] = 0;
1534 argc = j;
1535
1536 // Parse remaining options
1537
1538 opt = getopt32(argc, argv, "o:t:rwanfvs", &opt_o, &fstype);
1539 if (opt & 0x1) append_mount_options(&cmdopts, opt_o); // -o
1540 //if (opt & 0x2) // -t
1541 if (opt & 0x4) append_mount_options(&cmdopts, "ro"); // -r
1542 if (opt & 0x8) append_mount_options(&cmdopts, "rw"); // -w
1543 //if (opt & 0x10) // -a
1544 if (opt & 0x20) USE_FEATURE_MTAB_SUPPORT(useMtab = 0); // -n
1545 if (opt & 0x40) USE_FEATURE_MTAB_SUPPORT(fakeIt = 1); // -f
1546 //if (opt & 0x80) // -v: verbose (ignore)
1547 //if (opt & 0x100) // -s: sloppy (ignore)
1548 argv += optind;
1549 argc -= optind;
1550
1551 // Three or more non-option arguments? Die with a usage message.
1552
1553 if (argc > 2) bb_show_usage();
1554
1555 // If we have no arguments, show currently mounted filesystems
1556
1557 if (!argc) {
1558 if (!(opt & OPT_ALL)) {
1559 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1560
1561 if (!mountTable) bb_error_msg_and_die("no %s", bb_path_mtab_file);
1562
1563 while (getmntent_r(mountTable, mtpair, bb_common_bufsiz1,
1564 sizeof(bb_common_bufsiz1)))
1565 {
1566 // Don't show rootfs. FIXME: why??
1567 if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1568
1569 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1570 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1571 mtpair->mnt_dir, mtpair->mnt_type,
1572 mtpair->mnt_opts);
1573 }
1574 if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable);
1575 return EXIT_SUCCESS;
1576 }
1577 } else storage_path = bb_simplify_path(argv[0]);
1578
1579 // When we have two arguments, the second is the directory and we can
1580 // skip looking at fstab entirely. We can always abspath() the directory
1581 // argument when we get it.
1582
1583 if (argc == 2) {
1584 if (nonroot)
1585 bb_error_msg_and_die(must_be_root);
1586 mtpair->mnt_fsname = argv[0];
1587 mtpair->mnt_dir = argv[1];
1588 mtpair->mnt_type = fstype;
1589 mtpair->mnt_opts = cmdopts;
1590 rc = singlemount(mtpair, 0);
1591 goto clean_up;
1592 }
1593
1594 i = parse_mount_options(cmdopts, 0);
1595 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1596 bb_error_msg_and_die(must_be_root);
1597
1598 // If we have a shared subtree flag, don't worry about fstab or mtab.
1599
1600 if (ENABLE_FEATURE_MOUNT_FLAGS &&
1601 (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)))
1602 {
1603 rc = mount("", argv[0], "", i, "");
1604 if (rc) bb_perror_msg_and_die("%s", argv[0]);
1605 goto clean_up;
1606 }
1607
1608 // Open either fstab or mtab
1609
1610 fstabname = "/etc/fstab";
1611 if (i & MS_REMOUNT) {
1612 fstabname = bb_path_mtab_file;
1613 }
1614 fstab = setmntent(fstabname, "r");
1615 if (!fstab)
1616 bb_perror_msg_and_die("cannot read %s", fstabname);
1617
1618 // Loop through entries until we find what we're looking for.
1619
1620 memset(mtpair, 0, sizeof(mtpair));
1621 for (;;) {
1622 struct mntent *mtnext = (mtcur==mtpair ? mtpair+1 : mtpair);
1623
1624 // Get next fstab entry
1625
1626 if (!getmntent_r(fstab, mtcur, bb_common_bufsiz1
1627 + (mtcur==mtpair ? sizeof(bb_common_bufsiz1)/2 : 0),
1628 sizeof(bb_common_bufsiz1)/2))
1629 {
1630 // Were we looking for something specific?
1631
1632 if (argc) {
1633
1634 // If we didn't find anything, complain.
1635
1636 if (!mtnext->mnt_fsname)
1637 bb_error_msg_and_die("can't find %s in %s",
1638 argv[0], fstabname);
1639
1640 mtcur = mtnext;
1641 if (nonroot) {
1642 // fstab must have "users" or "user"
1643 if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS))
1644 bb_error_msg_and_die(must_be_root);
1645 }
1646
1647 // Mount the last thing we found.
1648
1649 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1650 append_mount_options(&(mtcur->mnt_opts), cmdopts);
1651 rc = singlemount(mtcur, 0);
1652 free(mtcur->mnt_opts);
1653 }
1654 goto clean_up;
1655 }
1656
1657 /* If we're trying to mount something specific and this isn't it,
1658 * skip it. Note we must match both the exact text in fstab (ala
1659 * "proc") or a full path from root */
1660
1661 if (argc) {
1662
1663 // Is this what we're looking for?
1664
1665 if (strcmp(argv[0], mtcur->mnt_fsname) &&
1666 strcmp(storage_path, mtcur->mnt_fsname) &&
1667 strcmp(argv[0], mtcur->mnt_dir) &&
1668 strcmp(storage_path, mtcur->mnt_dir)) continue;
1669
1670 // Remember this entry. Something later may have overmounted
1671 // it, and we want the _last_ match.
1672
1673 mtcur = mtnext;
1674
1675 // If we're mounting all.
1676
1677 } else {
1678 // Do we need to match a filesystem type?
1679 // TODO: support "-t type1,type2"; "-t notype1,type2"
1680
1681 if (fstype && strcmp(mtcur->mnt_type, fstype)) continue;
1682
1683 // Skip noauto and swap anyway.
1684
1685 if (parse_mount_options(mtcur->mnt_opts, 0)
1686 & (MOUNT_NOAUTO | MOUNT_SWAP)) continue;
1687
1688 // No, mount -a won't mount anything,
1689 // even user mounts, for mere humans.
1690
1691 if (nonroot)
1692 bb_error_msg_and_die(must_be_root);
1693
1694 // Mount this thing.
1695
1696 if (singlemount(mtcur, 1)) {
1697 /* Count number of failed mounts */
1698 rc++;
1699 }
1700 }
1701 }
1702 if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
1703
1704clean_up:
1705
1706 if (ENABLE_FEATURE_CLEAN_UP) {
1707 free(storage_path);
1708 free(cmdopts);
1709 }
1710
1711 return rc;
1712}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-14 11:25:55 +0000