1 /*-
2 * Copyright (c) 1980, 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California. All rights reserved.
30 * @(#)mount.c 8.25 (Berkeley) 5/8/95
31 * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
32 */
33
34 #include <sys/param.h>
35 #include <sys/mount.h>
36 #include <sys/mountctl.h>
37 #define DKTYPENAMES
38 #include <sys/dtype.h>
39 #include <sys/diskslice.h>
40 #include <sys/stat.h>
41 #include <sys/wait.h>
42
43 #include <err.h>
44 #include <errno.h>
45 #include <fcntl.h>
46 #include <fstab.h>
47 #include <mntopts.h>
48 #include <pwd.h>
49 #include <signal.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54 #include <libutil.h>
55
56 #include "extern.h"
57 #include "pathnames.h"
58
59 /* `meta' options */
60 #define MOUNT_META_OPTION_FSTAB "fstab"
61 #define MOUNT_META_OPTION_CURRENT "current"
62
63 int debug, fstab_style, verbose;
64
65 static char *catopt(char *, const char *);
66 static struct statfs
67 *getmntpt(const char *);
68 static int hasopt(const char *, const char *);
69 static int ismounted(struct fstab *, struct statfs *, int);
70 static int isremountable(const char *);
71 static void mangle(char *, int *, const char **);
72 static char *update_options(char *, char *, int);
73 static int mountfs(const char *, const char *, const char *,
74 int, const char *, const char *);
75 static void remopt(char *, const char *);
76 static void printdefvals(const struct statfs *);
77 static void prmount(struct statfs *);
78 static void putfsent(const struct statfs *);
79 static void usage(void);
80 static char *flags2opts(int);
81 static char *xstrdup(const char *str);
82 static void checkdisklabel(const char *devpath, const char **vfstypep);
83
84 /*
85 * List of VFS types that can be remounted without becoming mounted on top
86 * of each other.
87 * XXX Is this list correct?
88 */
89 static const char *remountable_fs_names[] = {
90 "ufs", "ffs", "ext2fs", "hammer", "hammer2",
91 NULL
92 };
93
94 static void
restart_mountd(void)95 restart_mountd(void)
96 {
97 struct pidfh *pfh;
98 pid_t mountdpid;
99
100 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
101 if (pfh != NULL) {
102 /* Mountd is not running. */
103 pidfile_remove(pfh);
104 return;
105 }
106 if (errno != EEXIST) {
107 /* Cannot open pidfile for some reason. */
108 return;
109 }
110
111 /*
112 * We have mountd(8) PID in mountdpid varible, let's signal it.
113 * Silently ignore any error. mountd might not be signalable for
114 * various reasons (jail, different reaper, bad /var/run/mountd.pid
115 * file, etc)
116 */
117 kill(mountdpid, SIGUSR1);
118 }
119
120 int
main(int argc,char ** argv)121 main(int argc, char **argv)
122 {
123 const char *mntfromname, **vfslist, *vfstype;
124 struct fstab *fs;
125 struct statfs *mntbuf;
126 int all, ch, i, init_flags, mntsize, rval, have_fstab;
127 char *options;
128
129 all = init_flags = 0;
130 options = NULL;
131 vfslist = NULL;
132 vfstype = "ufs";
133 while ((ch = getopt(argc, argv, "adF:fo:prwt:uv")) != -1) {
134 switch (ch) {
135 case 'a':
136 all = 1;
137 break;
138 case 'd':
139 debug = 1;
140 break;
141 case 'F':
142 setfstab(optarg);
143 break;
144 case 'f':
145 init_flags |= MNT_FORCE;
146 break;
147 case 'o':
148 if (*optarg)
149 options = catopt(options, optarg);
150 break;
151 case 'p':
152 fstab_style = 1;
153 verbose = 1;
154 break;
155 case 'r':
156 options = catopt(options, "ro");
157 break;
158 case 't':
159 if (vfslist != NULL)
160 errx(1, "only one -t option may be specified");
161 vfslist = makevfslist(optarg);
162 vfstype = optarg;
163 break;
164 case 'u':
165 init_flags |= MNT_UPDATE;
166 break;
167 case 'v':
168 verbose = 1;
169 break;
170 case 'w':
171 options = catopt(options, "noro");
172 break;
173 case '?':
174 default:
175 usage();
176 /* NOTREACHED */
177 }
178 }
179 argc -= optind;
180 argv += optind;
181
182 #define BADTYPE(type) \
183 (strcmp(type, FSTAB_RO) && \
184 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
185
186 rval = 0;
187 switch (argc) {
188 case 0:
189 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
190 err(1, "getmntinfo");
191 if (all) {
192 while ((fs = getfsent()) != NULL) {
193 if (BADTYPE(fs->fs_type))
194 continue;
195 if (checkvfsname(fs->fs_vfstype, vfslist))
196 continue;
197 if (hasopt(fs->fs_mntops, "noauto"))
198 continue;
199 if (!(init_flags & MNT_UPDATE) &&
200 ismounted(fs, mntbuf, mntsize))
201 continue;
202 options = update_options(options,
203 fs->fs_mntops, mntbuf->f_flags);
204 if (mountfs(fs->fs_vfstype, fs->fs_spec,
205 fs->fs_file, init_flags, options,
206 fs->fs_mntops))
207 rval = 1;
208 }
209 } else if (fstab_style) {
210 for (i = 0; i < mntsize; i++) {
211 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
212 continue;
213 putfsent(&mntbuf[i]);
214 }
215 } else {
216 for (i = 0; i < mntsize; i++) {
217 if (checkvfsname(mntbuf[i].f_fstypename,
218 vfslist))
219 continue;
220 prmount(&mntbuf[i]);
221 }
222 }
223 exit(rval);
224 case 1:
225 if (vfslist != NULL)
226 usage();
227
228 rmslashes(*argv, *argv);
229
230 if (init_flags & MNT_UPDATE) {
231 mntfromname = NULL;
232 have_fstab = 0;
233 if ((mntbuf = getmntpt(*argv)) == NULL)
234 errx(1, "not currently mounted %s", *argv);
235 /*
236 * Only get the mntflags from fstab if both mntpoint
237 * and mntspec are identical. Also handle the special
238 * case where just '/' is mounted and 'spec' is not
239 * identical with the one from fstab ('/dev' is missing
240 * in the spec-string at boot-time).
241 */
242 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
243 if (strcmp(fs->fs_spec,
244 mntbuf->f_mntfromname) == 0 &&
245 strcmp(fs->fs_file,
246 mntbuf->f_mntonname) == 0) {
247 have_fstab = 1;
248 mntfromname = mntbuf->f_mntfromname;
249 } else if (argv[0][0] == '/' &&
250 argv[0][1] == '\0') {
251 fs = getfsfile("/");
252 have_fstab = 1;
253 mntfromname = fs->fs_spec;
254 }
255 }
256 if (have_fstab) {
257 options = update_options(options, fs->fs_mntops,
258 mntbuf->f_flags);
259 } else {
260 mntfromname = mntbuf->f_mntfromname;
261 options = update_options(options, NULL,
262 mntbuf->f_flags);
263 }
264 rval = mountfs(mntbuf->f_fstypename, mntfromname,
265 mntbuf->f_mntonname, init_flags, options, 0);
266 break;
267 }
268 if ((fs = getfsfile(*argv)) == NULL &&
269 (fs = getfsspec(*argv)) == NULL)
270 errx(1, "%s: unknown special file or file system",
271 *argv);
272 if (BADTYPE(fs->fs_type))
273 errx(1, "%s has unknown file system type",
274 *argv);
275 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
276 init_flags, options, fs->fs_mntops);
277 break;
278 case 2:
279 /*
280 * If -t flag has not been specified, the path cannot be
281 * found.
282 *
283 * If the spec is not a file and contains a ':' then assume
284 * NFS.
285 *
286 * If the spec is not a file and contains a '@' then assume
287 * HAMMER2. Note that there may not be a raw device
288 * specified in this situation.
289 *
290 * If the spec is a cdev attempt to extract the fstype from
291 * the label.
292 *
293 * When all else fails ufs is assumed.
294 */
295 if (vfslist == NULL) {
296 if (strpbrk(argv[0], ":") != NULL &&
297 access(argv[0], 0) == -1) {
298 vfstype = "nfs";
299 } else if (strpbrk(argv[0], "@") != NULL &&
300 access(argv[0], 0) == -1) {
301 vfstype = "hammer2";
302 } else {
303 checkdisklabel(argv[0], &vfstype);
304 }
305 }
306
307 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
308 init_flags, options, NULL);
309 break;
310 default:
311 usage();
312 /* NOTREACHED */
313 }
314
315 /*
316 * If the mount was successfully, and done by root, tell mountd the
317 * good news.
318 */
319 if (rval == 0 && getuid() == 0)
320 restart_mountd();
321
322 exit(rval);
323 }
324
325 static int
ismounted(struct fstab * fs,struct statfs * mntbuf,int mntsize)326 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
327 {
328 int i;
329
330 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
331 /* the root file system can always be remounted */
332 return (0);
333
334 for (i = mntsize - 1; i >= 0; --i)
335 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
336 (!isremountable(fs->fs_vfstype) ||
337 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
338 return (1);
339 return (0);
340 }
341
342 static int
isremountable(const char * vfsname)343 isremountable(const char *vfsname)
344 {
345 const char **cp;
346
347 for (cp = remountable_fs_names; *cp; cp++)
348 if (strcmp(*cp, vfsname) == 0)
349 return (1);
350 return (0);
351 }
352
353 static int
hasopt(const char * mntopts,const char * option)354 hasopt(const char *mntopts, const char *option)
355 {
356 int negative, found;
357 char *opt, *optbuf;
358
359 if (option[0] == 'n' && option[1] == 'o') {
360 negative = 1;
361 option += 2;
362 } else
363 negative = 0;
364 optbuf = xstrdup(mntopts);
365 found = 0;
366 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
367 if (opt[0] == 'n' && opt[1] == 'o') {
368 if (!strcasecmp(opt + 2, option))
369 found = negative;
370 } else if (!strcasecmp(opt, option))
371 found = !negative;
372 }
373 free(optbuf);
374 return (found);
375 }
376
377 static int
mountfs(const char * vfstype,const char * spec,const char * name,int flags,const char * options,const char * mntopts)378 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
379 const char *options, const char *mntopts)
380 {
381 /* List of directories containing mount_xxx subcommands. */
382 static const char *edirs[] = {
383 _PATH_SBIN,
384 _PATH_USRSBIN,
385 NULL
386 };
387 const char *argv[100], **edir;
388 struct statfs sf;
389 pid_t pid;
390 int argc, i, status;
391 char *optbuf;
392 char *argv0;
393 char execname[MAXPATHLEN + 1];
394 char mntpath[MAXPATHLEN];
395
396 /* resolve the mountpoint with realpath(3) */
397 checkpath(name, mntpath);
398 name = mntpath;
399
400 if (mntopts == NULL)
401 mntopts = "";
402 if (options == NULL) {
403 if (*mntopts == '\0') {
404 options = "rw";
405 } else {
406 options = mntopts;
407 mntopts = "";
408 }
409 }
410 optbuf = catopt(xstrdup(mntopts), options);
411
412 if (strcmp(name, "/") == 0)
413 flags |= MNT_UPDATE;
414 if (flags & MNT_FORCE)
415 optbuf = catopt(optbuf, "force");
416 if (flags & MNT_RDONLY)
417 optbuf = catopt(optbuf, "ro");
418 /*
419 * XXX
420 * The mount_mfs (newfs) command uses -o to select the
421 * optimization mode. We don't pass the default "-o rw"
422 * for that reason.
423 */
424 if (flags & MNT_UPDATE)
425 optbuf = catopt(optbuf, "update");
426
427 asprintf(&argv0, "mount_%s", vfstype);
428
429 argc = 0;
430 argv[argc++] = argv0;
431 mangle(optbuf, &argc, argv);
432 argv[argc++] = spec;
433 argv[argc++] = name;
434 argv[argc] = NULL;
435
436 if (debug) {
437 printf("exec: mount_%s", vfstype);
438 for (i = 1; i < argc; i++)
439 printf(" %s", argv[i]);
440 printf("\n");
441 return (0);
442 }
443
444 switch (pid = fork()) {
445 case -1: /* Error. */
446 warn("fork");
447 free(optbuf);
448 return (1);
449 case 0: /* Child. */
450 /* Go find an executable. */
451 for (edir = edirs; *edir; edir++) {
452 snprintf(execname, sizeof(execname),
453 "%s/mount_%s", *edir, vfstype);
454 execv(execname, __DECONST(char * const *, argv));
455 }
456 if (errno == ENOENT) {
457 int len = 0;
458 char *cp;
459 for (edir = edirs; *edir; edir++)
460 len += strlen(*edir) + 2; /* ", " */
461 if ((cp = malloc(len)) == NULL)
462 errx(1, "malloc failed");
463 cp[0] = '\0';
464 for (edir = edirs; *edir; edir++) {
465 strcat(cp, *edir);
466 if (edir[1] != NULL)
467 strcat(cp, ", ");
468 }
469 warn("exec mount_%s not found in %s", vfstype, cp);
470 }
471 exit(1);
472 /* NOTREACHED */
473 default: /* Parent. */
474 free(optbuf);
475
476 if (waitpid(pid, &status, 0) < 0) {
477 warn("waitpid");
478 return (1);
479 }
480
481 if (WIFEXITED(status)) {
482 if (WEXITSTATUS(status) != 0)
483 return (WEXITSTATUS(status));
484 } else if (WIFSIGNALED(status)) {
485 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
486 return (1);
487 }
488
489 if (verbose) {
490 if (statfs(name, &sf) < 0) {
491 warn("statfs %s", name);
492 return (1);
493 }
494 if (fstab_style)
495 putfsent(&sf);
496 else
497 prmount(&sf);
498 }
499 break;
500 }
501
502 return (0);
503 }
504
505 static void
prmount(struct statfs * sfp)506 prmount(struct statfs *sfp)
507 {
508 struct passwd *pw;
509 char *buf;
510 int error;
511 int len;
512
513 error = 0;
514 len = 256;
515
516 if ((buf = malloc(len)) == NULL)
517 errx(1, "malloc failed");
518
519 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
520 sfp->f_fstypename);
521
522 /* Get a string buffer with all the used flags names */
523 error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS,
524 -1, NULL, 0, buf, len);
525
526 if (sfp->f_owner) {
527 printf(", mounted by ");
528 if ((pw = getpwuid(sfp->f_owner)) != NULL)
529 printf("%s", pw->pw_name);
530 else
531 printf("%d", sfp->f_owner);
532 }
533
534 if (error != -1 && strlen(buf))
535 printf(", %s", buf);
536
537 if (verbose) {
538 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
539 printf(", writes: sync %ld async %ld",
540 sfp->f_syncwrites, sfp->f_asyncwrites);
541 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
542 printf(", reads: sync %ld async %ld",
543 sfp->f_syncreads, sfp->f_asyncreads);
544 }
545 printf(")\n");
546 }
547
548 static struct statfs *
getmntpt(const char * name)549 getmntpt(const char *name)
550 {
551 struct statfs *mntbuf;
552 int i, mntsize;
553
554 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
555 for (i = mntsize - 1; i >= 0; i--) {
556 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
557 strcmp(mntbuf[i].f_mntonname, name) == 0)
558 return (&mntbuf[i]);
559 }
560 return (NULL);
561 }
562
563 static char *
catopt(char * s0,const char * s1)564 catopt(char *s0, const char *s1)
565 {
566 size_t i;
567 char *cp;
568
569 if (s1 == NULL || *s1 == '\0')
570 return s0;
571
572 if (s0 && *s0) {
573 i = strlen(s0) + strlen(s1) + 1 + 1;
574 if ((cp = malloc(i)) == NULL)
575 errx(1, "malloc failed");
576 snprintf(cp, i, "%s,%s", s0, s1);
577 } else
578 cp = xstrdup(s1);
579
580 if (s0)
581 free(s0);
582 return (cp);
583 }
584
585 static void
mangle(char * options,int * argcp,const char ** argv)586 mangle(char *options, int *argcp, const char **argv)
587 {
588 char *p, *s;
589 int argc;
590
591 argc = *argcp;
592 for (s = options; (p = strsep(&s, ",")) != NULL;)
593 if (*p != '\0') {
594 if (*p == '-') {
595 argv[argc++] = p;
596 p = strchr(p, '=');
597 if (p) {
598 *p = '\0';
599 argv[argc++] = p+1;
600 }
601 } else if (strcmp(p, "rw") != 0) {
602 argv[argc++] = "-o";
603 argv[argc++] = p;
604 }
605 }
606
607 *argcp = argc;
608 }
609
610
611 static char *
update_options(char * opts,char * fstab,int curflags)612 update_options(char *opts, char *fstab, int curflags)
613 {
614 char *o, *p;
615 char *cur;
616 char *expopt, *newopt, *tmpopt;
617
618 if (opts == NULL)
619 return xstrdup("");
620
621 /* remove meta options from list */
622 remopt(fstab, MOUNT_META_OPTION_FSTAB);
623 remopt(fstab, MOUNT_META_OPTION_CURRENT);
624 cur = flags2opts(curflags);
625
626 /*
627 * Expand all meta-options passed to us first.
628 */
629 expopt = NULL;
630 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
631 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
632 expopt = catopt(expopt, fstab);
633 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
634 expopt = catopt(expopt, cur);
635 else
636 expopt = catopt(expopt, o);
637 }
638 free(cur);
639 free(opts);
640
641 /*
642 * Remove previous contradictory arguments. Given option "foo" we
643 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
644 * and "foo" - so we can deal with possible options like "notice".
645 */
646 newopt = NULL;
647 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
648 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
649 errx(1, "malloc failed");
650
651 strcpy(tmpopt, "no");
652 strcat(tmpopt, o);
653 remopt(newopt, tmpopt);
654 free(tmpopt);
655
656 if (strncmp("no", o, 2) == 0)
657 remopt(newopt, o+2);
658
659 newopt = catopt(newopt, o);
660 }
661 free(expopt);
662
663 return newopt;
664 }
665
666 static void
remopt(char * string,const char * opt)667 remopt(char *string, const char *opt)
668 {
669 char *o, *p, *r;
670
671 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
672 return;
673
674 r = string;
675
676 for (p = string; (o = strsep(&p, ",")) != NULL;) {
677 if (strcmp(opt, o) != 0) {
678 if (*r == ',' && *o != '\0')
679 r++;
680 while ((*r++ = *o++) != '\0')
681 ;
682 *--r = ',';
683 }
684 }
685 *r = '\0';
686 }
687
688 static void
usage(void)689 usage(void)
690 {
691
692 fprintf(stderr, "%s\n%s\n%s\n",
693 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t type]",
694 " mount [-dfpruvw] {special | node}",
695 " mount [-dfpruvw] [-o options] [-t type] special node");
696 exit(1);
697 }
698
699 /*
700 * Prints the default values for dump frequency and pass number of fsck.
701 * This happens when mount(8) is called with -p and there is no fstab file
702 * or there is but the values aren't specified.
703 */
704 static void
printdefvals(const struct statfs * ent)705 printdefvals(const struct statfs *ent)
706 {
707 if (strcmp(ent->f_fstypename, "ufs") == 0) {
708 if (strcmp(ent->f_mntonname, "/") == 0)
709 printf("\t1 1\n");
710 else
711 printf("\t2 2\n");
712 } else {
713 printf("\t0 0\n");
714 }
715 }
716
717 static void
putfsent(const struct statfs * ent)718 putfsent(const struct statfs *ent)
719 {
720 struct stat sb;
721 struct fstab *fst;
722 char *opts;
723
724 opts = flags2opts(ent->f_flags);
725 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
726 ent->f_fstypename, opts);
727 free(opts);
728
729 /*
730 * If fstab file is missing don't call getfsspec() or getfsfile()
731 * at all, because the same warning will be printed twice for every
732 * mounted filesystem.
733 */
734 if (stat(_PATH_FSTAB, &sb) != -1) {
735 if ((fst = getfsspec(ent->f_mntfromname)))
736 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
737 else if ((fst = getfsfile(ent->f_mntonname)))
738 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
739 else
740 printdefvals(ent);
741 } else {
742 printdefvals(ent);
743 }
744 }
745
746
747 static char *
flags2opts(int flags)748 flags2opts(int flags)
749 {
750 char *res;
751
752 res = NULL;
753
754 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
755
756 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
757 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
758 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
759 if (flags & MNT_NODEV) res = catopt(res, "nodev");
760 if (flags & MNT_ASYNC) res = catopt(res, "async");
761 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
762 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
763 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
764 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
765 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
766 if (flags & MNT_IGNORE) res = catopt(res, "ignore");
767
768 return res;
769 }
770
771 static char*
xstrdup(const char * str)772 xstrdup(const char *str)
773 {
774 char* ret = strdup(str);
775 if(ret == NULL) {
776 errx(1, "strdup failed (could not allocate memory)");
777 }
778 return ret;
779 }
780
781 /*
782 * Hack 'cd9660' for the default fstype on cd media if no disklabel
783 * found.
784 */
785 static int
iscdmedia(const char * path,int fd __unused)786 iscdmedia(const char *path, int fd __unused)
787 {
788 int n;
789
790 if (strrchr(path, '/'))
791 path = strrchr(path, '/') + 1;
792 if (sscanf(path, "acd%d", &n) == 1)
793 return 1;
794 if (sscanf(path, "cd%d", &n) == 1)
795 return 1;
796 return 0;
797 }
798
799 /*
800 * If the device path is a cdev attempt to access the disklabel to determine
801 * the filesystem type. Adjust *vfstypep if we can figure it out
802 * definitively.
803 *
804 * Ignore any portion of the device path after an '@' or ':'.
805 */
806 static void
checkdisklabel(const char * devpath,const char ** vfstypep)807 checkdisklabel(const char *devpath, const char **vfstypep)
808 {
809 struct stat st;
810 struct partinfo info;
811 char *path = strdup(devpath);
812 int fd;
813
814 if (strchr(path, '@'))
815 *strchr(path, '@') = 0;
816 if (strchr(path, ':'))
817 *strchr(path, ':') = 0;
818
819 if (stat(path, &st) < 0)
820 goto done;
821 if (!S_ISCHR(st.st_mode))
822 goto done;
823 fd = open(path, O_RDONLY);
824 if (fd < 0)
825 goto done;
826 if (ioctl(fd, DIOCGPART, &info) == 0) {
827 if (info.fstype >= 0 && info.fstype < (int)FSMAXTYPES) {
828 if (fstype_to_vfsname[info.fstype]) {
829 *vfstypep = fstype_to_vfsname[info.fstype];
830 } else if (iscdmedia(path, fd)) {
831 *vfstypep = "cd9660";
832 } else {
833 fprintf(stderr,
834 "mount: warning: fstype in disklabel "
835 "not set to anything I understand\n");
836 fprintf(stderr,
837 "attempting to mount with -t ufs\n");
838 }
839 }
840 }
841 close(fd);
842 done:
843 free(path);
844 }
845