mount.c revision 163672 
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 * 4. 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
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1980, 1989, 1993, 1994\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)mount.c	8.25 (Berkeley) 5/8/95";
39#endif
40static const char rcsid[] =
41  "$FreeBSD: head/sbin/mount/mount.c 163672 2006-10-24 22:16:51Z ru $";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/mount.h>
46#include <sys/stat.h>
47#include <sys/wait.h>
48
49#include <ctype.h>
50#include <err.h>
51#include <errno.h>
52#include <fstab.h>
53#include <paths.h>
54#include <pwd.h>
55#include <signal.h>
56#include <stdint.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62#include "extern.h"
63#include "mntopts.h"
64#include "pathnames.h"
65
66/* `meta' options */
67#define MOUNT_META_OPTION_FSTAB		"fstab"
68#define MOUNT_META_OPTION_CURRENT	"current"
69
70int debug, fstab_style, verbose;
71
72char   *catopt(char *, const char *);
73struct statfs *getmntpt(const char *);
74int	hasopt(const char *, const char *);
75int	ismounted(struct fstab *, struct statfs *, int);
76int	isremountable(const char *);
77void	mangle(char *, int *, char *[]);
78char   *update_options(char *, char *, int);
79int	mountfs(const char *, const char *, const char *,
80			int, const char *, const char *);
81void	remopt(char *, const char *);
82void	prmount(struct statfs *);
83void	putfsent(const struct statfs *);
84void	usage(void);
85char   *flags2opts(int);
86
87/* Map from mount options to printable formats. */
88static struct opt {
89	int o_opt;
90	const char *o_name;
91} optnames[] = {
92	{ MNT_ASYNC,		"asynchronous" },
93	{ MNT_EXPORTED,		"NFS exported" },
94	{ MNT_LOCAL,		"local" },
95	{ MNT_NOATIME,		"noatime" },
96	{ MNT_NOEXEC,		"noexec" },
97	{ MNT_NOSUID,		"nosuid" },
98	{ MNT_NOSYMFOLLOW,	"nosymfollow" },
99	{ MNT_QUOTA,		"with quotas" },
100	{ MNT_RDONLY,		"read-only" },
101	{ MNT_SYNCHRONOUS,	"synchronous" },
102	{ MNT_UNION,		"union" },
103	{ MNT_NOCLUSTERR,	"noclusterr" },
104	{ MNT_NOCLUSTERW,	"noclusterw" },
105	{ MNT_SUIDDIR,		"suiddir" },
106	{ MNT_SOFTDEP,		"soft-updates" },
107	{ MNT_MULTILABEL,	"multilabel" },
108	{ MNT_ACLS,		"acls" },
109	{ 0, NULL }
110};
111
112/*
113 * List of VFS types that can be remounted without becoming mounted on top
114 * of each other.
115 * XXX Is this list correct?
116 */
117static const char *
118remountable_fs_names[] = {
119	"ufs", "ffs", "ext2fs",
120	0
121};
122
123static const char userquotaeq[] = "userquota=";
124static const char groupquotaeq[] = "groupquota=";
125
126static int
127use_mountprog(const char *vfstype)
128{
129	/* XXX: We need to get away from implementing external mount
130	 *      programs for every filesystem, and move towards having
131	 *	each filesystem properly implement the nmount() system call.
132	 */
133	unsigned int i;
134	const char *fs[] = {
135	"cd9660", "mfs", "msdosfs", "nfs", "nfs4", "ntfs",
136	"nwfs", "nullfs", "portalfs", "smbfs", "udf", "umapfs",
137	"unionfs",
138	NULL
139	};
140
141	for (i = 0; fs[i] != NULL; ++i) {
142		if (strcmp(vfstype, fs[i]) == 0)
143			return (1);
144	}
145
146	return (0);
147}
148
149static int
150exec_mountprog(const char *name, const char *execname, char *const argv[])
151{
152	pid_t pid;
153	int status;
154
155	switch (pid = fork()) {
156	case -1:				/* Error. */
157		warn("fork");
158		exit (1);
159	case 0:					/* Child. */
160		/* Go find an executable. */
161		execvP(execname, _PATH_SYSPATH, argv);
162		if (errno == ENOENT) {
163			warn("exec %s not found in %s", execname,
164			    _PATH_SYSPATH);
165		}
166		exit(1);
167	default:				/* Parent. */
168		if (waitpid(pid, &status, 0) < 0) {
169			warn("waitpid");
170			return (1);
171		}
172
173		if (WIFEXITED(status)) {
174			if (WEXITSTATUS(status) != 0)
175				return (WEXITSTATUS(status));
176		} else if (WIFSIGNALED(status)) {
177			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
178			return (1);
179		}
180		break;
181	}
182
183	return (0);
184}
185
186static int
187specified_ro(const char *arg)
188{
189	char *optbuf, *opt;
190	int ret = 0;
191
192	optbuf = strdup(arg);
193	if (optbuf == NULL)
194		 err(1, NULL);
195
196	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
197		if (strcmp(opt, "ro") == 0) {
198			ret = 1;
199			break;
200		}
201	}
202	free(optbuf);
203	return (ret);
204}
205
206int
207main(int argc, char *argv[])
208{
209	const char *mntfromname, **vfslist, *vfstype;
210	struct fstab *fs;
211	struct statfs *mntbuf;
212	FILE *mountdfp;
213	pid_t pid;
214	int all, ch, i, init_flags, late, mntsize, rval, have_fstab, ro;
215	char *cp, *ep, *options;
216
217	all = init_flags = late = 0;
218	ro = 0;
219	options = NULL;
220	vfslist = NULL;
221	vfstype = "ufs";
222	while ((ch = getopt(argc, argv, "adF:flo:prt:uvw")) != -1)
223		switch (ch) {
224		case 'a':
225			all = 1;
226			break;
227		case 'd':
228			debug = 1;
229			break;
230		case 'F':
231			setfstab(optarg);
232			break;
233		case 'f':
234			init_flags |= MNT_FORCE;
235			break;
236		case 'l':
237			late = 1;
238			break;
239		case 'o':
240			if (*optarg) {
241				options = catopt(options, optarg);
242				if (specified_ro(optarg))
243					ro = 1;
244			}
245			break;
246		case 'p':
247			fstab_style = 1;
248			verbose = 1;
249			break;
250		case 'r':
251			options = catopt(options, "ro");
252			ro = 1;
253			break;
254		case 't':
255			if (vfslist != NULL)
256				errx(1, "only one -t option may be specified");
257			vfslist = makevfslist(optarg);
258			vfstype = optarg;
259			break;
260		case 'u':
261			init_flags |= MNT_UPDATE;
262			break;
263		case 'v':
264			verbose = 1;
265			break;
266		case 'w':
267			options = catopt(options, "noro");
268			break;
269		case '?':
270		default:
271			usage();
272			/* NOTREACHED */
273		}
274	argc -= optind;
275	argv += optind;
276
277#define	BADTYPE(type)							\
278	(strcmp(type, FSTAB_RO) &&					\
279	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
280
281	if ((init_flags & MNT_UPDATE) && (ro == 0))
282		options = catopt(options, "noro");
283
284	rval = 0;
285	switch (argc) {
286	case 0:
287		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
288			err(1, "getmntinfo");
289		if (all) {
290			while ((fs = getfsent()) != NULL) {
291				if (BADTYPE(fs->fs_type))
292					continue;
293				if (checkvfsname(fs->fs_vfstype, vfslist))
294					continue;
295				if (hasopt(fs->fs_mntops, "noauto"))
296					continue;
297				if (hasopt(fs->fs_mntops, "late") && !late)
298					continue;
299				if (!(init_flags & MNT_UPDATE) &&
300				    ismounted(fs, mntbuf, mntsize))
301					continue;
302				options = update_options(options, fs->fs_mntops,
303				    mntbuf->f_flags);
304				if (mountfs(fs->fs_vfstype, fs->fs_spec,
305				    fs->fs_file, init_flags, options,
306				    fs->fs_mntops))
307					rval = 1;
308			}
309		} else if (fstab_style) {
310			for (i = 0; i < mntsize; i++) {
311				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
312					continue;
313				putfsent(&mntbuf[i]);
314			}
315		} else {
316			for (i = 0; i < mntsize; i++) {
317				if (checkvfsname(mntbuf[i].f_fstypename,
318				    vfslist))
319					continue;
320				prmount(&mntbuf[i]);
321			}
322		}
323		exit(rval);
324	case 1:
325		if (vfslist != NULL)
326			usage();
327
328		rmslashes(*argv, *argv);
329		if (init_flags & MNT_UPDATE) {
330			mntfromname = NULL;
331			have_fstab = 0;
332			if ((mntbuf = getmntpt(*argv)) == NULL)
333				errx(1, "not currently mounted %s", *argv);
334			/*
335			 * Only get the mntflags from fstab if both mntpoint
336			 * and mntspec are identical. Also handle the special
337			 * case where just '/' is mounted and 'spec' is not
338			 * identical with the one from fstab ('/dev' is missing
339			 * in the spec-string at boot-time).
340			 */
341			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
342				if (strcmp(fs->fs_spec,
343				    mntbuf->f_mntfromname) == 0 &&
344				    strcmp(fs->fs_file,
345				    mntbuf->f_mntonname) == 0) {
346					have_fstab = 1;
347					mntfromname = mntbuf->f_mntfromname;
348				} else if (argv[0][0] == '/' &&
349				    argv[0][1] == '\0') {
350					fs = getfsfile("/");
351					have_fstab = 1;
352					mntfromname = fs->fs_spec;
353				}
354			}
355			if (have_fstab) {
356				options = update_options(options, fs->fs_mntops,
357				    mntbuf->f_flags);
358			} else {
359				mntfromname = mntbuf->f_mntfromname;
360				options = update_options(options, NULL,
361				    mntbuf->f_flags);
362			}
363			rval = mountfs(mntbuf->f_fstypename, mntfromname,
364			    mntbuf->f_mntonname, init_flags, options, 0);
365			break;
366		}
367		if ((fs = getfsfile(*argv)) == NULL &&
368		    (fs = getfsspec(*argv)) == NULL)
369			errx(1, "%s: unknown special file or file system",
370			    *argv);
371		if (BADTYPE(fs->fs_type))
372			errx(1, "%s has unknown file system type",
373			    *argv);
374		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
375		    init_flags, options, fs->fs_mntops);
376		break;
377	case 2:
378		/*
379		 * If -t flag has not been specified, the path cannot be
380		 * found, spec contains either a ':' or a '@', then assume
381		 * that an NFS file system is being specified ala Sun.
382		 * Check if the hostname contains only allowed characters
383		 * to reduce false positives.  IPv6 addresses containing
384		 * ':' will be correctly parsed only if the separator is '@'.
385		 * The definition of a valid hostname is taken from RFC 1034.
386		 */
387		if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
388		    (ep = strchr(argv[0], ':')) != NULL)) {
389			if (*ep == '@') {
390				cp = ep + 1;
391				ep = cp + strlen(cp);
392			} else
393				cp = argv[0];
394			while (cp != ep) {
395				if (!isdigit(*cp) && !isalpha(*cp) &&
396				    *cp != '.' && *cp != '-' && *cp != ':')
397					break;
398				cp++;
399			}
400			if (cp == ep)
401				vfstype = "nfs";
402		}
403		rval = mountfs(vfstype,
404		    argv[0], argv[1], init_flags, options, NULL);
405		break;
406	default:
407		usage();
408		/* NOTREACHED */
409	}
410
411	/*
412	 * If the mount was successfully, and done by root, tell mountd the
413	 * good news.  Pid checks are probably unnecessary, but don't hurt.
414	 */
415	if (rval == 0 && getuid() == 0 &&
416	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
417		if (fscanf(mountdfp, "%d", &pid) == 1 &&
418		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
419			err(1, "signal mountd");
420		(void)fclose(mountdfp);
421	}
422
423	exit(rval);
424}
425
426int
427ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
428{
429	char realfsfile[PATH_MAX];
430	int i;
431
432	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
433		/* the root file system can always be remounted */
434		return (0);
435
436	/* The user may have specified a symlink in fstab, resolve the path */
437	if (realpath(fs->fs_file, realfsfile) == NULL) {
438		/* Cannot resolve the path, use original one */
439		strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
440	}
441
442	for (i = mntsize - 1; i >= 0; --i)
443		if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
444		    (!isremountable(fs->fs_vfstype) ||
445		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
446			return (1);
447	return (0);
448}
449
450int
451isremountable(const char *vfsname)
452{
453	const char **cp;
454
455	for (cp = remountable_fs_names; *cp; cp++)
456		if (strcmp(*cp, vfsname) == 0)
457			return (1);
458	return (0);
459}
460
461int
462hasopt(const char *mntopts, const char *option)
463{
464	int negative, found;
465	char *opt, *optbuf;
466
467	if (option[0] == 'n' && option[1] == 'o') {
468		negative = 1;
469		option += 2;
470	} else
471		negative = 0;
472	optbuf = strdup(mntopts);
473	found = 0;
474	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
475		if (opt[0] == 'n' && opt[1] == 'o') {
476			if (!strcasecmp(opt + 2, option))
477				found = negative;
478		} else if (!strcasecmp(opt, option))
479			found = !negative;
480	}
481	free(optbuf);
482	return (found);
483}
484
485int
486mountfs(const char *vfstype, const char *spec, const char *name, int flags,
487	const char *options, const char *mntopts)
488{
489	char *argv[100];
490	struct statfs sf;
491	int argc, i, ret;
492	char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
493
494	/* resolve the mountpoint with realpath(3) */
495	(void)checkpath(name, mntpath);
496	name = mntpath;
497
498	if (mntopts == NULL)
499		mntopts = "";
500	optbuf = catopt(strdup(mntopts), options);
501
502	if (strcmp(name, "/") == 0)
503		flags |= MNT_UPDATE;
504	if (flags & MNT_FORCE)
505		optbuf = catopt(optbuf, "force");
506	if (flags & MNT_RDONLY)
507		optbuf = catopt(optbuf, "ro");
508	/*
509	 * XXX
510	 * The mount_mfs (newfs) command uses -o to select the
511	 * optimization mode.  We don't pass the default "-o rw"
512	 * for that reason.
513	 */
514	if (flags & MNT_UPDATE)
515		optbuf = catopt(optbuf, "update");
516
517	/* Compatibility glue. */
518	if (strcmp(vfstype, "msdos") == 0)
519		vfstype = "msdosfs";
520
521	/* Construct the name of the appropriate mount command */
522	(void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
523
524	argc = 0;
525	argv[argc++] = execname;
526	mangle(optbuf, &argc, argv);
527	argv[argc++] = strdup(spec);
528	argv[argc++] = strdup(name);
529	argv[argc] = NULL;
530
531	if (debug) {
532		(void)printf("exec: mount_%s", vfstype);
533		for (i = 1; i < argc; i++)
534			(void)printf(" %s", argv[i]);
535		(void)printf("\n");
536		return (0);
537	}
538
539	if (use_mountprog(vfstype)) {
540		ret = exec_mountprog(name, execname, argv);
541	} else {
542		ret = mount_fs(vfstype, argc, argv);
543	}
544
545	free(optbuf);
546
547	if (verbose) {
548		if (statfs(name, &sf) < 0) {
549			warn("statfs %s", name);
550			return (1);
551		}
552		if (fstab_style)
553			putfsent(&sf);
554		else
555			prmount(&sf);
556	}
557
558	return (0);
559}
560
561void
562prmount(struct statfs *sfp)
563{
564	int flags;
565	unsigned int i;
566	struct opt *o;
567	struct passwd *pw;
568
569	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
570	    sfp->f_fstypename);
571
572	flags = sfp->f_flags & MNT_VISFLAGMASK;
573	for (o = optnames; flags && o->o_opt; o++)
574		if (flags & o->o_opt) {
575			(void)printf(", %s", o->o_name);
576			flags &= ~o->o_opt;
577		}
578	/*
579	 * Inform when file system is mounted by an unprivileged user
580	 * or privileged non-root user.
581	 */
582	if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
583		(void)printf(", mounted by ");
584		if ((pw = getpwuid(sfp->f_owner)) != NULL)
585			(void)printf("%s", pw->pw_name);
586		else
587			(void)printf("%d", sfp->f_owner);
588	}
589	if (verbose) {
590		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
591			(void)printf(", writes: sync %ju async %ju",
592			    (uintmax_t)sfp->f_syncwrites,
593			    (uintmax_t)sfp->f_asyncwrites);
594		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
595			(void)printf(", reads: sync %ju async %ju",
596			    (uintmax_t)sfp->f_syncreads,
597			    (uintmax_t)sfp->f_asyncreads);
598		if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
599			printf(", fsid ");
600			for (i = 0; i < sizeof(sfp->f_fsid); i++)
601				printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
602		}
603	}
604	(void)printf(")\n");
605}
606
607struct statfs *
608getmntpt(const char *name)
609{
610	struct statfs *mntbuf;
611	int i, mntsize;
612
613	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
614	for (i = mntsize - 1; i >= 0; i--) {
615		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
616		    strcmp(mntbuf[i].f_mntonname, name) == 0)
617			return (&mntbuf[i]);
618	}
619	return (NULL);
620}
621
622char *
623catopt(char *s0, const char *s1)
624{
625	size_t i;
626	char *cp;
627
628	if (s1 == NULL || *s1 == '\0')
629		return (s0);
630
631	if (s0 && *s0) {
632		i = strlen(s0) + strlen(s1) + 1 + 1;
633		if ((cp = malloc(i)) == NULL)
634			errx(1, "malloc failed");
635		(void)snprintf(cp, i, "%s,%s", s0, s1);
636	} else
637		cp = strdup(s1);
638
639	if (s0)
640		free(s0);
641	return (cp);
642}
643
644void
645mangle(char *options, int *argcp, char *argv[])
646{
647	char *p, *s;
648	int argc;
649
650	argc = *argcp;
651	for (s = options; (p = strsep(&s, ",")) != NULL;)
652		if (*p != '\0') {
653			if (strcmp(p, "noauto") == 0) {
654				/*
655				 * Do not pass noauto option to nmount().
656				 * or external mount program.  noauto is
657				 * only used to prevent mounting a filesystem
658				 * when 'mount -a' is specified, and is
659				 * not a real mount option.
660				 */
661				continue;
662			} else if (strcmp(p, "late") == 0) {
663				/*
664				 * "late" is used to prevent certain file
665				 * systems from being mounted before late
666				 * in the boot cycle; for instance,
667				 * loopback NFS mounts can't be mounted
668				 * before mountd starts.
669				 */
670				continue;
671			} else if (strcmp(p, "userquota") == 0) {
672				continue;
673			} else if (strncmp(p, userquotaeq,
674			    sizeof(userquotaeq) - 1) == 0) {
675				continue;
676			} else if (strcmp(p, "groupquota") == 0) {
677				continue;
678			} else if (strncmp(p, groupquotaeq,
679			    sizeof(groupquotaeq) - 1) == 0) {
680				continue;
681			} else if (*p == '-') {
682				argv[argc++] = p;
683				p = strchr(p, '=');
684				if (p != NULL) {
685					*p = '\0';
686					argv[argc++] = p+1;
687				}
688			} else {
689				argv[argc++] = strdup("-o");
690				argv[argc++] = p;
691			}
692		}
693
694	*argcp = argc;
695}
696
697
698char *
699update_options(char *opts, char *fstab, int curflags)
700{
701	char *o, *p;
702	char *cur;
703	char *expopt, *newopt, *tmpopt;
704
705	if (opts == NULL)
706		return (strdup(""));
707
708	/* remove meta options from list */
709	remopt(fstab, MOUNT_META_OPTION_FSTAB);
710	remopt(fstab, MOUNT_META_OPTION_CURRENT);
711	cur = flags2opts(curflags);
712
713	/*
714	 * Expand all meta-options passed to us first.
715	 */
716	expopt = NULL;
717	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
718		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
719			expopt = catopt(expopt, fstab);
720		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
721			expopt = catopt(expopt, cur);
722		else
723			expopt = catopt(expopt, o);
724	}
725	free(cur);
726	free(opts);
727
728	/*
729	 * Remove previous contradictory arguments. Given option "foo" we
730	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
731	 * and "foo" - so we can deal with possible options like "notice".
732	 */
733	newopt = NULL;
734	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
735		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
736			errx(1, "malloc failed");
737
738		strcpy(tmpopt, "no");
739		strcat(tmpopt, o);
740		remopt(newopt, tmpopt);
741		free(tmpopt);
742
743		if (strncmp("no", o, 2) == 0)
744			remopt(newopt, o+2);
745
746		newopt = catopt(newopt, o);
747	}
748	free(expopt);
749
750	return (newopt);
751}
752
753void
754remopt(char *string, const char *opt)
755{
756	char *o, *p, *r;
757
758	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
759		return;
760
761	r = string;
762
763	for (p = string; (o = strsep(&p, ",")) != NULL;) {
764		if (strcmp(opt, o) != 0) {
765			if (*r == ',' && *o != '\0')
766				r++;
767			while ((*r++ = *o++) != '\0')
768			    ;
769			*--r = ',';
770		}
771	}
772	*r = '\0';
773}
774
775void
776usage(void)
777{
778
779	(void)fprintf(stderr, "%s\n%s\n%s\n",
780"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
781"       mount [-dfpruvw] special | node",
782"       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
783	exit(1);
784}
785
786void
787putfsent(const struct statfs *ent)
788{
789	struct fstab *fst;
790	char *opts;
791
792	opts = flags2opts(ent->f_flags);
793
794	/*
795	 * "rw" is not a real mount option; this is why we print NULL as "rw"
796	 * if opts is still NULL here.
797	 */
798	printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
799	    ent->f_fstypename, opts ? opts : "rw");
800	free(opts);
801
802	if ((fst = getfsspec(ent->f_mntfromname)))
803		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
804	else if ((fst = getfsfile(ent->f_mntonname)))
805		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
806	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
807		if (strcmp(ent->f_mntonname, "/") == 0)
808			printf("\t1 1\n");
809		else
810			printf("\t2 2\n");
811	} else
812		printf("\t0 0\n");
813}
814
815
816char *
817flags2opts(int flags)
818{
819	char *res;
820
821	res = NULL;
822
823	if (flags & MNT_RDONLY)		res = catopt(res, "ro");
824	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
825	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
826	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
827	if (flags & MNT_UNION)		res = catopt(res, "union");
828	if (flags & MNT_ASYNC)		res = catopt(res, "async");
829	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
830	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
831	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
832	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
833	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
834	if (flags & MNT_MULTILABEL)	res = catopt(res, "multilabel");
835	if (flags & MNT_ACLS)		res = catopt(res, "acls");
836
837	return (res);
838}
839