1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1989, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #define _WANT_MNTOPTNAMES
34 #include <sys/mount.h>
35 #include <sys/stat.h>
36 #include <sys/wait.h>
37
38 #include <ctype.h>
39 #include <err.h>
40 #include <errno.h>
41 #include <fstab.h>
42 #include <paths.h>
43 #include <pwd.h>
44 #include <signal.h>
45 #include <stdint.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50 #include <libutil.h>
51 #include <libxo/xo.h>
52
53 #include "extern.h"
54 #include "mntopts.h"
55 #include "pathnames.h"
56
57 #define EXIT(a) { \
58 xo_close_container("mount"); \
59 xo_finish(); \
60 exit(a); \
61 }
62
63 /* `meta' options */
64 #define MOUNT_META_OPTION_FSTAB "fstab"
65 #define MOUNT_META_OPTION_CURRENT "current"
66
67 static int debug, fstab_style, verbose;
68
69 struct cpa {
70 char **a;
71 ssize_t sz;
72 int c;
73 };
74
75 char *catopt(char *, const char *);
76 int hasopt(const char *, const char *);
77 int ismounted(struct fstab *, struct statfs *, int);
78 int isremountable(const char *);
79 int allow_file_mount(const char *);
80 void mangle(char *, struct cpa *);
81 char *update_options(char *, char *, int);
82 int mountfs(const char *, const char *, const char *,
83 int, const char *, const char *);
84 void remopt(char *, const char *);
85 void prmount(struct statfs *);
86 void putfsent(struct statfs *);
87 void usage(void);
88 char *flags2opts(int);
89
90 /* Map from mount options to printable formats. */
91 static struct mntoptnames optnames[] = {
92 MNTOPT_NAMES
93 };
94
95 /*
96 * List of VFS types that can be remounted without becoming mounted on top
97 * of each other.
98 * XXX Is this list correct?
99 */
100 static const char *
101 remountable_fs_names[] = {
102 "ufs", "ffs", "ext2fs",
103 0
104 };
105
106 static const char userquotaeq[] = "userquota=";
107 static const char groupquotaeq[] = "groupquota=";
108
109 static char *mountprog = NULL;
110
111 static int
use_mountprog(const char * vfstype)112 use_mountprog(const char *vfstype)
113 {
114 /* XXX: We need to get away from implementing external mount
115 * programs for every filesystem, and move towards having
116 * each filesystem properly implement the nmount() system call.
117 */
118 unsigned int i;
119 const char *fs[] = {
120 "cd9660", "mfs", "msdosfs", "nfs",
121 "nullfs", "smbfs", "udf", "unionfs",
122 NULL
123 };
124
125 if (mountprog != NULL)
126 return (1);
127
128 for (i = 0; fs[i] != NULL; ++i) {
129 if (strcmp(vfstype, fs[i]) == 0)
130 return (1);
131 }
132
133 return (0);
134 }
135
136 static int
exec_mountprog(const char * name,const char * execname,char * const argv[])137 exec_mountprog(const char *name, const char *execname, char *const argv[])
138 {
139 pid_t pid;
140 int status;
141
142 switch (pid = fork()) {
143 case -1: /* Error. */
144 xo_warn("fork");
145 EXIT(1);
146 case 0: /* Child. */
147 /* Go find an executable. */
148 execvP(execname, _PATH_SYSPATH, argv);
149 if (errno == ENOENT) {
150 xo_warn("exec %s not found", execname);
151 if (execname[0] != '/') {
152 xo_warnx("in path: %s", _PATH_SYSPATH);
153 }
154 }
155 EXIT(1);
156 default: /* Parent. */
157 if (waitpid(pid, &status, 0) < 0) {
158 xo_warn("waitpid");
159 return (1);
160 }
161
162 if (WIFEXITED(status)) {
163 if (WEXITSTATUS(status) != 0)
164 return (WEXITSTATUS(status));
165 } else if (WIFSIGNALED(status)) {
166 xo_warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
167 return (1);
168 }
169 break;
170 }
171
172 return (0);
173 }
174
175 static int
specified_ro(const char * arg)176 specified_ro(const char *arg)
177 {
178 char *optbuf, *opt;
179 int ret = 0;
180
181 optbuf = strdup(arg);
182 if (optbuf == NULL)
183 xo_err(1, "strdup failed");
184
185 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
186 if (strcmp(opt, "ro") == 0) {
187 ret = 1;
188 break;
189 }
190 }
191 free(optbuf);
192 return (ret);
193 }
194
195 static void
restart_mountd(void)196 restart_mountd(void)
197 {
198
199 pidfile_signal(_PATH_MOUNTDPID, SIGHUP, NULL);
200 }
201
202 int
main(int argc,char * argv[])203 main(int argc, char *argv[])
204 {
205 const char *mntfromname, **vfslist, *vfstype;
206 struct fstab *fs;
207 struct statfs *mntbuf;
208 int all, ch, i, init_flags, late, failok, mntsize, rval, have_fstab, ro;
209 int onlylate;
210 char *cp, *ep, *options;
211
212 all = init_flags = late = onlylate = 0;
213 ro = 0;
214 options = NULL;
215 vfslist = NULL;
216 vfstype = "ufs";
217
218 argc = xo_parse_args(argc, argv);
219 if (argc < 0)
220 exit(1);
221 xo_open_container("mount");
222
223 while ((ch = getopt(argc, argv, "adF:fLlno:prt:uvw")) != -1)
224 switch (ch) {
225 case 'a':
226 all = 1;
227 break;
228 case 'd':
229 debug = 1;
230 break;
231 case 'F':
232 setfstab(optarg);
233 break;
234 case 'f':
235 init_flags |= MNT_FORCE;
236 break;
237 case 'L':
238 onlylate = 1;
239 late = 1;
240 break;
241 case 'l':
242 late = 1;
243 break;
244 case 'n':
245 /* For compatibility with the Linux version of mount. */
246 break;
247 case 'o':
248 if (*optarg) {
249 options = catopt(options, optarg);
250 if (specified_ro(optarg))
251 ro = 1;
252 }
253 break;
254 case 'p':
255 fstab_style = 1;
256 verbose = 1;
257 break;
258 case 'r':
259 options = catopt(options, "ro");
260 ro = 1;
261 break;
262 case 't':
263 if (vfslist != NULL)
264 xo_errx(1, "only one -t option may be specified");
265 vfslist = makevfslist(optarg);
266 vfstype = optarg;
267 break;
268 case 'u':
269 init_flags |= MNT_UPDATE;
270 break;
271 case 'v':
272 verbose = 1;
273 break;
274 case 'w':
275 options = catopt(options, "noro");
276 break;
277 case '?':
278 default:
279 usage();
280 /* NOTREACHED */
281 }
282 argc -= optind;
283 argv += optind;
284
285 #define BADTYPE(type) \
286 (strcmp(type, FSTAB_RO) && \
287 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
288
289 if ((init_flags & MNT_UPDATE) && (ro == 0))
290 options = catopt(options, "noro");
291
292 rval = 0;
293 switch (argc) {
294 case 0:
295 if ((mntsize = getmntinfo(&mntbuf,
296 verbose ? MNT_WAIT : MNT_NOWAIT)) == 0)
297 xo_err(1, "getmntinfo");
298 if (all) {
299 while ((fs = getfsent()) != NULL) {
300 if (BADTYPE(fs->fs_type))
301 continue;
302 if (checkvfsname(fs->fs_vfstype, vfslist))
303 continue;
304 if (hasopt(fs->fs_mntops, "noauto"))
305 continue;
306 if (!hasopt(fs->fs_mntops, "late") && onlylate)
307 continue;
308 if (hasopt(fs->fs_mntops, "late") && !late)
309 continue;
310 if (hasopt(fs->fs_mntops, "failok"))
311 failok = 1;
312 else
313 failok = 0;
314 if (!(init_flags & MNT_UPDATE) &&
315 !hasopt(fs->fs_mntops, "update") &&
316 ismounted(fs, mntbuf, mntsize))
317 continue;
318 options = update_options(options, fs->fs_mntops,
319 mntbuf->f_flags);
320 if (mountfs(fs->fs_vfstype, fs->fs_spec,
321 fs->fs_file, init_flags, options,
322 fs->fs_mntops) && !failok)
323 rval = 1;
324 }
325 } else if (fstab_style) {
326 xo_open_list("fstab");
327 for (i = 0; i < mntsize; i++) {
328 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
329 continue;
330 xo_open_instance("fstab");
331 putfsent(&mntbuf[i]);
332 xo_close_instance("fstab");
333 }
334 xo_close_list("fstab");
335 } else {
336 xo_open_list("mounted");
337 for (i = 0; i < mntsize; i++) {
338 if (checkvfsname(mntbuf[i].f_fstypename,
339 vfslist))
340 continue;
341 if (!verbose &&
342 (mntbuf[i].f_flags & MNT_IGNORE) != 0)
343 continue;
344 xo_open_instance("mounted");
345 prmount(&mntbuf[i]);
346 xo_close_instance("mounted");
347 }
348 xo_close_list("mounted");
349 }
350 EXIT(rval);
351 case 1:
352 if (vfslist != NULL)
353 usage();
354
355 rmslashes(*argv, *argv);
356 if (init_flags & MNT_UPDATE) {
357 mntfromname = NULL;
358 have_fstab = 0;
359 if ((mntbuf = getmntpoint(*argv)) == NULL)
360 xo_errx(1, "not currently mounted %s", *argv);
361 /*
362 * Only get the mntflags from fstab if both mntpoint
363 * and mntspec are identical. Also handle the special
364 * case where just '/' is mounted and 'spec' is not
365 * identical with the one from fstab ('/dev' is missing
366 * in the spec-string at boot-time).
367 */
368 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
369 if (strcmp(fs->fs_spec,
370 mntbuf->f_mntfromname) == 0 &&
371 strcmp(fs->fs_file,
372 mntbuf->f_mntonname) == 0) {
373 have_fstab = 1;
374 mntfromname = mntbuf->f_mntfromname;
375 } else if (argv[0][0] == '/' &&
376 argv[0][1] == '\0' &&
377 strcmp(fs->fs_vfstype,
378 mntbuf->f_fstypename) == 0) {
379 fs = getfsfile("/");
380 have_fstab = 1;
381 mntfromname = fs->fs_spec;
382 }
383 }
384 if (have_fstab) {
385 options = update_options(options, fs->fs_mntops,
386 mntbuf->f_flags);
387 } else {
388 mntfromname = mntbuf->f_mntfromname;
389 options = update_options(options, NULL,
390 mntbuf->f_flags);
391 }
392 rval = mountfs(mntbuf->f_fstypename, mntfromname,
393 mntbuf->f_mntonname, init_flags, options, 0);
394 break;
395 }
396 if ((fs = getfsfile(*argv)) == NULL &&
397 (fs = getfsspec(*argv)) == NULL)
398 xo_errx(1, "%s: unknown special file or file system",
399 *argv);
400 if (BADTYPE(fs->fs_type))
401 xo_errx(1, "%s has unknown file system type",
402 *argv);
403 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
404 init_flags, options, fs->fs_mntops);
405 break;
406 case 2:
407 /*
408 * If -t flag has not been specified, the path cannot be
409 * found, spec contains either a ':' or a '@', then assume
410 * that an NFS file system is being specified ala Sun.
411 * Check if the hostname contains only allowed characters
412 * to reduce false positives. IPv6 addresses containing
413 * ':' will be correctly parsed only if the separator is '@'.
414 * The definition of a valid hostname is taken from RFC 1034.
415 */
416 if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
417 (ep = strchr(argv[0], ':')) != NULL)) {
418 if (*ep == '@') {
419 cp = ep + 1;
420 ep = cp + strlen(cp);
421 } else
422 cp = argv[0];
423 while (cp != ep) {
424 if (!isdigit(*cp) && !isalpha(*cp) &&
425 *cp != '.' && *cp != '-' && *cp != ':')
426 break;
427 cp++;
428 }
429 if (cp == ep)
430 vfstype = "nfs";
431 }
432 rval = mountfs(vfstype,
433 argv[0], argv[1], init_flags, options, NULL);
434 break;
435 default:
436 usage();
437 /* NOTREACHED */
438 }
439
440 /*
441 * If the mount was successfully, and done by root, tell mountd the
442 * good news.
443 */
444 if (rval == 0 && getuid() == 0)
445 restart_mountd();
446
447 EXIT(rval);
448 }
449
450 int
ismounted(struct fstab * fs,struct statfs * mntbuf,int mntsize)451 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
452 {
453 char realfsfile[PATH_MAX];
454 int i;
455
456 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
457 /* the root file system can always be remounted */
458 return (0);
459
460 /* The user may have specified a symlink in fstab, resolve the path */
461 if (realpath(fs->fs_file, realfsfile) == NULL) {
462 /* Cannot resolve the path, use original one */
463 strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
464 }
465
466 /*
467 * Consider the filesystem to be mounted if:
468 * It has the same mountpoint as a mounted filesystem, and
469 * It has the same type as that same mounted filesystem, and
470 * It has the same device name as that same mounted filesystem, OR
471 * It is a nonremountable filesystem
472 */
473 for (i = mntsize - 1; i >= 0; --i)
474 if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
475 strcmp(fs->fs_vfstype, mntbuf[i].f_fstypename) == 0 &&
476 (!isremountable(fs->fs_vfstype) ||
477 (strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0)))
478 return (1);
479 return (0);
480 }
481
482 int
isremountable(const char * vfsname)483 isremountable(const char *vfsname)
484 {
485 const char **cp;
486
487 for (cp = remountable_fs_names; *cp; cp++)
488 if (strcmp(*cp, vfsname) == 0)
489 return (1);
490 return (0);
491 }
492
493 int
allow_file_mount(const char * vfsname)494 allow_file_mount(const char *vfsname)
495 {
496
497 if (strcmp(vfsname, "nullfs") == 0)
498 return (1);
499 return (0);
500 }
501
502 int
hasopt(const char * mntopts,const char * option)503 hasopt(const char *mntopts, const char *option)
504 {
505 int negative, found;
506 char *opt, *optbuf;
507
508 if (option[0] == 'n' && option[1] == 'o') {
509 negative = 1;
510 option += 2;
511 } else
512 negative = 0;
513 optbuf = strdup(mntopts);
514 found = 0;
515 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
516 if (opt[0] == 'n' && opt[1] == 'o') {
517 if (!strcasecmp(opt + 2, option))
518 found = negative;
519 } else if (!strcasecmp(opt, option))
520 found = !negative;
521 }
522 free(optbuf);
523 return (found);
524 }
525
526 static void
append_arg(struct cpa * sa,char * arg)527 append_arg(struct cpa *sa, char *arg)
528 {
529 if (sa->c + 1 == sa->sz) {
530 sa->sz = sa->sz == 0 ? 8 : sa->sz * 2;
531 sa->a = realloc(sa->a, sizeof(*sa->a) * sa->sz);
532 if (sa->a == NULL)
533 xo_errx(1, "realloc failed");
534 }
535 sa->a[++sa->c] = arg;
536 }
537
538 int
mountfs(const char * vfstype,const char * spec,const char * name,int flags,const char * options,const char * mntopts)539 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
540 const char *options, const char *mntopts)
541 {
542 struct statfs sf;
543 int i, ret;
544 char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
545 static struct cpa mnt_argv;
546
547 /* resolve the mountpoint with realpath(3) */
548 if (allow_file_mount(vfstype)) {
549 if (checkpath_allow_file(name, mntpath) != 0) {
550 xo_warn("%s", mntpath);
551 return (1);
552 }
553 } else {
554 if (checkpath(name, mntpath) != 0) {
555 xo_warn("%s", mntpath);
556 return (1);
557 }
558 }
559 name = mntpath;
560
561 if (mntopts == NULL)
562 mntopts = "";
563 optbuf = catopt(strdup(mntopts), options);
564
565 if (strcmp(name, "/") == 0)
566 flags |= MNT_UPDATE;
567 if (flags & MNT_FORCE)
568 optbuf = catopt(optbuf, "force");
569 if (flags & MNT_RDONLY)
570 optbuf = catopt(optbuf, "ro");
571 /*
572 * XXX
573 * The mount_mfs (newfs) command uses -o to select the
574 * optimization mode. We don't pass the default "-o rw"
575 * for that reason.
576 */
577 if (flags & MNT_UPDATE)
578 optbuf = catopt(optbuf, "update");
579
580 /* Compatibility glue. */
581 if (strcmp(vfstype, "msdos") == 0)
582 vfstype = "msdosfs";
583
584 /* Construct the name of the appropriate mount command */
585 (void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
586
587 mnt_argv.c = -1;
588 append_arg(&mnt_argv, execname);
589 mangle(optbuf, &mnt_argv);
590 if (mountprog != NULL)
591 strlcpy(execname, mountprog, sizeof(execname));
592
593 append_arg(&mnt_argv, strdup(spec));
594 append_arg(&mnt_argv, strdup(name));
595 append_arg(&mnt_argv, NULL);
596
597 if (debug) {
598 if (use_mountprog(vfstype))
599 xo_emit("{Lwc:exec}{:execname/%s}", execname);
600 else
601 xo_emit("{:execname/mount}{P: }{l:opts/-t}{P: }{l:opts/%s}", vfstype);
602 for (i = 1; i < mnt_argv.c; i++)
603 xo_emit("{P: }{l:opts}", mnt_argv.a[i]);
604 xo_emit("\n");
605 free(optbuf);
606 free(mountprog);
607 mountprog = NULL;
608 return (0);
609 }
610
611 if (use_mountprog(vfstype)) {
612 ret = exec_mountprog(name, execname, mnt_argv.a);
613 } else {
614 ret = mount_fs(vfstype, mnt_argv.c, mnt_argv.a);
615 }
616
617 free(optbuf);
618 free(mountprog);
619 mountprog = NULL;
620
621 if (verbose) {
622 if (statfs(name, &sf) < 0) {
623 xo_warn("statfs %s", name);
624 return (1);
625 }
626 if (fstab_style) {
627 xo_open_list("fstab");
628 xo_open_instance("fstab");
629 putfsent(&sf);
630 xo_close_instance("fstab");
631 xo_close_list("fstab");
632 } else {
633 xo_open_list("mounted");
634 xo_open_instance("mounted");
635 prmount(&sf);
636 xo_close_instance("mounted");
637 xo_close_list("mounted");
638 }
639 }
640
641 return (ret);
642 }
643
644 void
prmount(struct statfs * sfp)645 prmount(struct statfs *sfp)
646 {
647 uint64_t flags;
648 unsigned int i;
649 struct mntoptnames *o;
650 struct passwd *pw;
651 char *fsidbuf;
652
653 xo_emit("{:special/%hs}{L: on }{:node/%hs}{L: (}{:fstype}", sfp->f_mntfromname,
654 sfp->f_mntonname, sfp->f_fstypename);
655
656 flags = sfp->f_flags & MNT_VISFLAGMASK;
657 for (o = optnames; flags != 0 && o->o_opt != 0; o++)
658 if (flags & o->o_opt) {
659 xo_emit("{D:, }{l:opts}", o->o_name);
660 flags &= ~o->o_opt;
661 }
662 /*
663 * Inform when file system is mounted by an unprivileged user
664 * or privileged non-root user.
665 */
666 if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
667 xo_emit("{D:, }{L:mounted by }");
668 if ((pw = getpwuid(sfp->f_owner)) != NULL)
669 xo_emit("{:mounter/%hs}", pw->pw_name);
670 else
671 xo_emit("{:mounter/%hs}", sfp->f_owner);
672 }
673 if (verbose) {
674 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0) {
675 xo_open_container("writes");
676 xo_emit("{D:, }{Lwc:writes}{Lw:sync}{w:sync/%ju}{Lw:async}{:async/%ju}",
677 (uintmax_t)sfp->f_syncwrites,
678 (uintmax_t)sfp->f_asyncwrites);
679 xo_close_container("writes");
680 }
681 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0) {
682 xo_open_container("reads");
683 xo_emit("{D:, }{Lwc:reads}{Lw:sync}{w:sync/%ju}{Lw:async}{:async/%ju}",
684 (uintmax_t)sfp->f_syncreads,
685 (uintmax_t)sfp->f_asyncreads);
686 xo_close_container("reads");
687 }
688 if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
689 fsidbuf = malloc(sizeof(sfp->f_fsid) * 2 + 1);
690 if (fsidbuf == NULL)
691 xo_errx(1, "malloc failed");
692 for (i = 0; i < sizeof(sfp->f_fsid); i++)
693 sprintf(&fsidbuf[i * 2], "%02x",
694 ((u_char *)&sfp->f_fsid)[i]);
695 fsidbuf[i * 2] = '\0';
696 xo_emit("{D:, }{Lw:fsid}{:fsid}", fsidbuf);
697 free(fsidbuf);
698 }
699 if (sfp->f_nvnodelistsize != 0) {
700 xo_open_container("vnodes");
701 xo_emit("{D:, }{Lwc:vnodes}{Lw:count}{w:count/%ju}",
702 (uintmax_t)sfp->f_nvnodelistsize);
703 xo_close_container("vnodes");
704 }
705 }
706 xo_emit("{D:)}\n");
707 }
708
709 char *
catopt(char * s0,const char * s1)710 catopt(char *s0, const char *s1)
711 {
712 char *cp;
713
714 if (s1 == NULL || *s1 == '\0')
715 return (s0);
716
717 if (s0 && *s0) {
718 if (asprintf(&cp, "%s,%s", s0, s1) == -1)
719 xo_errx(1, "asprintf failed");
720 } else
721 cp = strdup(s1);
722
723 if (s0)
724 free(s0);
725 return (cp);
726 }
727
728 void
mangle(char * options,struct cpa * a)729 mangle(char *options, struct cpa *a)
730 {
731 char *p, *s, *val;
732
733 for (s = options; (p = strsep(&s, ",")) != NULL;)
734 if (*p != '\0') {
735 if (strcmp(p, "noauto") == 0) {
736 /*
737 * Do not pass noauto option to nmount().
738 * or external mount program. noauto is
739 * only used to prevent mounting a filesystem
740 * when 'mount -a' is specified, and is
741 * not a real mount option.
742 */
743 continue;
744 } else if (strcmp(p, "late") == 0) {
745 /*
746 * "late" is used to prevent certain file
747 * systems from being mounted before late
748 * in the boot cycle; for instance,
749 * loopback NFS mounts can't be mounted
750 * before mountd starts.
751 */
752 continue;
753 } else if (strcmp(p, "failok") == 0) {
754 /*
755 * "failok" is used to prevent certain file
756 * systems from being causing the system to
757 * drop into single user mode in the boot
758 * cycle, and is not a real mount option.
759 */
760 continue;
761 } else if (strncmp(p, "mountprog", 9) == 0) {
762 /*
763 * "mountprog" is used to force the use of
764 * userland mount programs.
765 */
766 val = strchr(p, '=');
767 if (val != NULL) {
768 ++val;
769 if (*val != '\0')
770 mountprog = strdup(val);
771 }
772
773 if (mountprog == NULL) {
774 xo_errx(1, "Need value for -o mountprog");
775 }
776 continue;
777 } else if (strcmp(p, "userquota") == 0) {
778 continue;
779 } else if (strncmp(p, userquotaeq,
780 sizeof(userquotaeq) - 1) == 0) {
781 continue;
782 } else if (strcmp(p, "groupquota") == 0) {
783 continue;
784 } else if (strncmp(p, groupquotaeq,
785 sizeof(groupquotaeq) - 1) == 0) {
786 continue;
787 } else if (*p == '-') {
788 append_arg(a, p);
789 p = strchr(p, '=');
790 if (p != NULL) {
791 *p = '\0';
792 append_arg(a, p + 1);
793 }
794 } else {
795 append_arg(a, strdup("-o"));
796 append_arg(a, p);
797 }
798 }
799 }
800
801
802 char *
update_options(char * opts,char * fstab,int curflags)803 update_options(char *opts, char *fstab, int curflags)
804 {
805 char *o, *p;
806 char *cur;
807 char *expopt, *newopt, *tmpopt;
808
809 if (opts == NULL)
810 return (strdup(""));
811
812 /* remove meta options from list */
813 remopt(fstab, MOUNT_META_OPTION_FSTAB);
814 remopt(fstab, MOUNT_META_OPTION_CURRENT);
815 cur = flags2opts(curflags);
816
817 /*
818 * Expand all meta-options passed to us first.
819 */
820 expopt = NULL;
821 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
822 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
823 expopt = catopt(expopt, fstab);
824 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
825 expopt = catopt(expopt, cur);
826 else
827 expopt = catopt(expopt, o);
828 }
829 free(cur);
830 free(opts);
831
832 /*
833 * Remove previous contradictory arguments. Given option "foo" we
834 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
835 * and "foo" - so we can deal with possible options like "notice".
836 */
837 newopt = NULL;
838 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
839 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
840 xo_errx(1, "malloc failed");
841
842 strcpy(tmpopt, "no");
843 strcat(tmpopt, o);
844 remopt(newopt, tmpopt);
845 free(tmpopt);
846
847 if (strncmp("no", o, 2) == 0)
848 remopt(newopt, o+2);
849
850 newopt = catopt(newopt, o);
851 }
852 free(expopt);
853
854 return (newopt);
855 }
856
857 void
remopt(char * string,const char * opt)858 remopt(char *string, const char *opt)
859 {
860 char *o, *p, *r;
861
862 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
863 return;
864
865 r = string;
866
867 for (p = string; (o = strsep(&p, ",")) != NULL;) {
868 if (strcmp(opt, o) != 0) {
869 if (*r == ',' && *o != '\0')
870 r++;
871 while ((*r++ = *o++) != '\0')
872 ;
873 *--r = ',';
874 }
875 }
876 *r = '\0';
877 }
878
879 void
usage(void)880 usage(void)
881 {
882
883 xo_error("%s\n%s\n%s\n",
884 "usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
885 " mount [-dfpruvw] special | node",
886 " mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
887 EXIT(1);
888 }
889
890 void
putfsent(struct statfs * ent)891 putfsent(struct statfs *ent)
892 {
893 struct fstab *fst;
894 char *opts, *rw;
895 int l;
896
897 opts = NULL;
898 /* flags2opts() doesn't return the "rw" option. */
899 if ((ent->f_flags & MNT_RDONLY) != 0)
900 rw = NULL;
901 else
902 rw = catopt(NULL, "rw");
903
904 opts = flags2opts(ent->f_flags);
905 opts = catopt(rw, opts);
906
907 if (strncmp(ent->f_mntfromname, "<below>", 7) == 0 ||
908 strncmp(ent->f_mntfromname, "<above>", 7) == 0) {
909 strlcpy(ent->f_mntfromname,
910 (strnstr(ent->f_mntfromname, ":", 8) +1),
911 sizeof(ent->f_mntfromname));
912 }
913
914 l = strlen(ent->f_mntfromname);
915 xo_emit("{:device}{P:/%s}{P:/%s}{P:/%s}",
916 ent->f_mntfromname,
917 l < 8 ? "\t" : "",
918 l < 16 ? "\t" : "",
919 l < 24 ? "\t" : " ");
920 l = strlen(ent->f_mntonname);
921 xo_emit("{:mntpoint}{P:/%s}{P:/%s}{P:/%s}",
922 ent->f_mntonname,
923 l < 8 ? "\t" : "",
924 l < 16 ? "\t" : "",
925 l < 24 ? "\t" : " ");
926 xo_emit("{:fstype}{P:\t}", ent->f_fstypename);
927 l = strlen(opts);
928 xo_emit("{:opts}{P:/%s}", opts,
929 l < 8 ? "\t" : " ");
930 free(opts);
931
932 if ((fst = getfsspec(ent->f_mntfromname)))
933 xo_emit("{P:\t}{n:dump/%u}{P: }{n:pass/%u}\n",
934 fst->fs_freq, fst->fs_passno);
935 else if ((fst = getfsfile(ent->f_mntonname)))
936 xo_emit("{P:\t}{n:dump/%u}{P: }{n:pass/%u}\n",
937 fst->fs_freq, fst->fs_passno);
938 else if (strcmp(ent->f_fstypename, "ufs") == 0) {
939 if (strcmp(ent->f_mntonname, "/") == 0)
940 xo_emit("{P:\t}{n:dump/1}{P: }{n:pass/1}\n");
941 else
942 xo_emit("{P:\t}{n:dump/2}{P: }{n:pass/2}\n");
943 } else
944 xo_emit("{P:\t}{n:dump/0}{P: }{n:pass/0}\n");
945 }
946
947
948 char *
flags2opts(int flags)949 flags2opts(int flags)
950 {
951 char *res;
952
953 res = NULL;
954
955 if (flags & MNT_RDONLY) res = catopt(res, "ro");
956 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
957 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
958 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
959 if (flags & MNT_UNION) res = catopt(res, "union");
960 if (flags & MNT_ASYNC) res = catopt(res, "async");
961 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
962 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
963 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
964 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
965 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
966 if (flags & MNT_MULTILABEL) res = catopt(res, "multilabel");
967 if (flags & MNT_ACLS) res = catopt(res, "acls");
968 if (flags & MNT_NFS4ACLS) res = catopt(res, "nfsv4acls");
969 if (flags & MNT_UNTRUSTED) res = catopt(res, "untrusted");
970 if (flags & MNT_NOCOVER) res = catopt(res, "nocover");
971 if (flags & MNT_EMPTYDIR) res = catopt(res, "emptydir");
972
973 return (res);
974 }
975