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#if 0
35static char sccsid[] = "@(#)mount.c	8.25 (Berkeley) 5/8/95";
36#endif
37#endif /* not lint */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <sys/param.h>
43#include <sys/mount.h>
44#include <sys/stat.h>
45#include <sys/wait.h>
46
47#include <ctype.h>
48#include <err.h>
49#include <errno.h>
50#include <fstab.h>
51#include <paths.h>
52#include <pwd.h>
53#include <signal.h>
54#include <stdint.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59#include <libutil.h>
60
61#include "extern.h"
62#include "mntopts.h"
63#include "pathnames.h"
64
65/* `meta' options */
66#define MOUNT_META_OPTION_FSTAB		"fstab"
67#define MOUNT_META_OPTION_CURRENT	"current"
68
69int debug, fstab_style, verbose;
70
71struct cpa {
72	char	**a;
73	ssize_t	sz;
74	int	c;
75};
76
77char   *catopt(char *, const char *);
78struct statfs *getmntpt(const char *);
79int	hasopt(const char *, const char *);
80int	ismounted(struct fstab *, struct statfs *, int);
81int	isremountable(const char *);
82void	mangle(char *, struct cpa *);
83char   *update_options(char *, char *, int);
84int	mountfs(const char *, const char *, const char *,
85			int, const char *, const char *);
86void	remopt(char *, const char *);
87void	prmount(struct statfs *);
88void	putfsent(struct statfs *);
89void	usage(void);
90char   *flags2opts(int);
91
92/* Map from mount options to printable formats. */
93static struct opt {
94	uint64_t o_opt;
95	const char *o_name;
96} optnames[] = {
97	{ MNT_ASYNC,		"asynchronous" },
98	{ MNT_EXPORTED,		"NFS exported" },
99	{ MNT_LOCAL,		"local" },
100	{ MNT_NOATIME,		"noatime" },
101	{ MNT_NOEXEC,		"noexec" },
102	{ MNT_NOSUID,		"nosuid" },
103	{ MNT_NOSYMFOLLOW,	"nosymfollow" },
104	{ MNT_QUOTA,		"with quotas" },
105	{ MNT_RDONLY,		"read-only" },
106	{ MNT_SYNCHRONOUS,	"synchronous" },
107	{ MNT_UNION,		"union" },
108	{ MNT_NOCLUSTERR,	"noclusterr" },
109	{ MNT_NOCLUSTERW,	"noclusterw" },
110	{ MNT_SUIDDIR,		"suiddir" },
111	{ MNT_SOFTDEP,		"soft-updates" },
112	{ MNT_SUJ,		"journaled soft-updates" },
113	{ MNT_MULTILABEL,	"multilabel" },
114	{ MNT_ACLS,		"acls" },
115	{ MNT_NFS4ACLS,		"nfsv4acls" },
116	{ MNT_GJOURNAL,		"gjournal" },
117	{ 0, NULL }
118};
119
120/*
121 * List of VFS types that can be remounted without becoming mounted on top
122 * of each other.
123 * XXX Is this list correct?
124 */
125static const char *
126remountable_fs_names[] = {
127	"ufs", "ffs", "ext2fs",
128	0
129};
130
131static const char userquotaeq[] = "userquota=";
132static const char groupquotaeq[] = "groupquota=";
133
134static char *mountprog = NULL;
135
136static int
137use_mountprog(const char *vfstype)
138{
139	/* XXX: We need to get away from implementing external mount
140	 *      programs for every filesystem, and move towards having
141	 *	each filesystem properly implement the nmount() system call.
142	 */
143	unsigned int i;
144	const char *fs[] = {
145	"cd9660", "mfs", "msdosfs", "nfs", "ntfs",
146	"nwfs", "nullfs", "oldnfs", "portalfs", "smbfs", "udf", "unionfs",
147	NULL
148	};
149
150	if (mountprog != NULL)
151		return (1);
152
153	for (i = 0; fs[i] != NULL; ++i) {
154		if (strcmp(vfstype, fs[i]) == 0)
155			return (1);
156	}
157
158	return (0);
159}
160
161static int
162exec_mountprog(const char *name, const char *execname, char *const argv[])
163{
164	pid_t pid;
165	int status;
166
167	switch (pid = fork()) {
168	case -1:				/* Error. */
169		warn("fork");
170		exit (1);
171	case 0:					/* Child. */
172		/* Go find an executable. */
173		execvP(execname, _PATH_SYSPATH, argv);
174		if (errno == ENOENT) {
175			warn("exec %s not found", execname);
176			if (execname[0] != '/') {
177				warnx("in path: %s", _PATH_SYSPATH);
178			}
179		}
180		exit(1);
181	default:				/* Parent. */
182		if (waitpid(pid, &status, 0) < 0) {
183			warn("waitpid");
184			return (1);
185		}
186
187		if (WIFEXITED(status)) {
188			if (WEXITSTATUS(status) != 0)
189				return (WEXITSTATUS(status));
190		} else if (WIFSIGNALED(status)) {
191			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
192			return (1);
193		}
194		break;
195	}
196
197	return (0);
198}
199
200static int
201specified_ro(const char *arg)
202{
203	char *optbuf, *opt;
204	int ret = 0;
205
206	optbuf = strdup(arg);
207	if (optbuf == NULL)
208		 err(1, NULL);
209
210	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
211		if (strcmp(opt, "ro") == 0) {
212			ret = 1;
213			break;
214		}
215	}
216	free(optbuf);
217	return (ret);
218}
219
220static void
221restart_mountd(void)
222{
223	struct pidfh *pfh;
224	pid_t mountdpid;
225
226	pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
227	if (pfh != NULL) {
228		/* Mountd is not running. */
229		pidfile_remove(pfh);
230		return;
231	}
232	if (errno != EEXIST) {
233		/* Cannot open pidfile for some reason. */
234		return;
235	}
236	/* We have mountd(8) PID in mountdpid varible, let's signal it. */
237	if (kill(mountdpid, SIGHUP) == -1)
238		err(1, "signal mountd");
239}
240
241int
242main(int argc, char *argv[])
243{
244	const char *mntfromname, **vfslist, *vfstype;
245	struct fstab *fs;
246	struct statfs *mntbuf;
247	int all, ch, i, init_flags, late, failok, mntsize, rval, have_fstab, ro;
248	char *cp, *ep, *options;
249
250	all = init_flags = late = 0;
251	ro = 0;
252	options = NULL;
253	vfslist = NULL;
254	vfstype = "ufs";
255	while ((ch = getopt(argc, argv, "adF:flo:prt:uvw")) != -1)
256		switch (ch) {
257		case 'a':
258			all = 1;
259			break;
260		case 'd':
261			debug = 1;
262			break;
263		case 'F':
264			setfstab(optarg);
265			break;
266		case 'f':
267			init_flags |= MNT_FORCE;
268			break;
269		case 'l':
270			late = 1;
271			break;
272		case 'o':
273			if (*optarg) {
274				options = catopt(options, optarg);
275				if (specified_ro(optarg))
276					ro = 1;
277			}
278			break;
279		case 'p':
280			fstab_style = 1;
281			verbose = 1;
282			break;
283		case 'r':
284			options = catopt(options, "ro");
285			ro = 1;
286			break;
287		case 't':
288			if (vfslist != NULL)
289				errx(1, "only one -t option may be specified");
290			vfslist = makevfslist(optarg);
291			vfstype = optarg;
292			break;
293		case 'u':
294			init_flags |= MNT_UPDATE;
295			break;
296		case 'v':
297			verbose = 1;
298			break;
299		case 'w':
300			options = catopt(options, "noro");
301			break;
302		case '?':
303		default:
304			usage();
305			/* NOTREACHED */
306		}
307	argc -= optind;
308	argv += optind;
309
310#define	BADTYPE(type)							\
311	(strcmp(type, FSTAB_RO) &&					\
312	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
313
314	if ((init_flags & MNT_UPDATE) && (ro == 0))
315		options = catopt(options, "noro");
316
317	rval = 0;
318	switch (argc) {
319	case 0:
320		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
321			err(1, "getmntinfo");
322		if (all) {
323			while ((fs = getfsent()) != NULL) {
324				if (BADTYPE(fs->fs_type))
325					continue;
326				if (checkvfsname(fs->fs_vfstype, vfslist))
327					continue;
328				if (hasopt(fs->fs_mntops, "noauto"))
329					continue;
330				if (hasopt(fs->fs_mntops, "late") && !late)
331					continue;
332				if (hasopt(fs->fs_mntops, "failok"))
333					failok = 1;
334				else
335					failok = 0;
336				if (!(init_flags & MNT_UPDATE) &&
337				    ismounted(fs, mntbuf, mntsize))
338					continue;
339				options = update_options(options, fs->fs_mntops,
340				    mntbuf->f_flags);
341				if (mountfs(fs->fs_vfstype, fs->fs_spec,
342				    fs->fs_file, init_flags, options,
343				    fs->fs_mntops) && !failok)
344					rval = 1;
345			}
346		} else if (fstab_style) {
347			for (i = 0; i < mntsize; i++) {
348				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
349					continue;
350				putfsent(&mntbuf[i]);
351			}
352		} else {
353			for (i = 0; i < mntsize; i++) {
354				if (checkvfsname(mntbuf[i].f_fstypename,
355				    vfslist))
356					continue;
357				if (!verbose &&
358				    (mntbuf[i].f_flags & MNT_IGNORE) != 0)
359					continue;
360				prmount(&mntbuf[i]);
361			}
362		}
363		exit(rval);
364	case 1:
365		if (vfslist != NULL)
366			usage();
367
368		rmslashes(*argv, *argv);
369		if (init_flags & MNT_UPDATE) {
370			mntfromname = NULL;
371			have_fstab = 0;
372			if ((mntbuf = getmntpt(*argv)) == NULL)
373				errx(1, "not currently mounted %s", *argv);
374			/*
375			 * Only get the mntflags from fstab if both mntpoint
376			 * and mntspec are identical. Also handle the special
377			 * case where just '/' is mounted and 'spec' is not
378			 * identical with the one from fstab ('/dev' is missing
379			 * in the spec-string at boot-time).
380			 */
381			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
382				if (strcmp(fs->fs_spec,
383				    mntbuf->f_mntfromname) == 0 &&
384				    strcmp(fs->fs_file,
385				    mntbuf->f_mntonname) == 0) {
386					have_fstab = 1;
387					mntfromname = mntbuf->f_mntfromname;
388				} else if (argv[0][0] == '/' &&
389				    argv[0][1] == '\0') {
390					fs = getfsfile("/");
391					have_fstab = 1;
392					mntfromname = fs->fs_spec;
393				}
394			}
395			if (have_fstab) {
396				options = update_options(options, fs->fs_mntops,
397				    mntbuf->f_flags);
398			} else {
399				mntfromname = mntbuf->f_mntfromname;
400				options = update_options(options, NULL,
401				    mntbuf->f_flags);
402			}
403			rval = mountfs(mntbuf->f_fstypename, mntfromname,
404			    mntbuf->f_mntonname, init_flags, options, 0);
405			break;
406		}
407		if ((fs = getfsfile(*argv)) == NULL &&
408		    (fs = getfsspec(*argv)) == NULL)
409			errx(1, "%s: unknown special file or file system",
410			    *argv);
411		if (BADTYPE(fs->fs_type))
412			errx(1, "%s has unknown file system type",
413			    *argv);
414		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
415		    init_flags, options, fs->fs_mntops);
416		break;
417	case 2:
418		/*
419		 * If -t flag has not been specified, the path cannot be
420		 * found, spec contains either a ':' or a '@', then assume
421		 * that an NFS file system is being specified ala Sun.
422		 * Check if the hostname contains only allowed characters
423		 * to reduce false positives.  IPv6 addresses containing
424		 * ':' will be correctly parsed only if the separator is '@'.
425		 * The definition of a valid hostname is taken from RFC 1034.
426		 */
427		if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
428		    (ep = strchr(argv[0], ':')) != NULL)) {
429			if (*ep == '@') {
430				cp = ep + 1;
431				ep = cp + strlen(cp);
432			} else
433				cp = argv[0];
434			while (cp != ep) {
435				if (!isdigit(*cp) && !isalpha(*cp) &&
436				    *cp != '.' && *cp != '-' && *cp != ':')
437					break;
438				cp++;
439			}
440			if (cp == ep)
441				vfstype = "nfs";
442		}
443		rval = mountfs(vfstype,
444		    argv[0], argv[1], init_flags, options, NULL);
445		break;
446	default:
447		usage();
448		/* NOTREACHED */
449	}
450
451	/*
452	 * If the mount was successfully, and done by root, tell mountd the
453	 * good news.
454	 */
455	if (rval == 0 && getuid() == 0)
456		restart_mountd();
457
458	exit(rval);
459}
460
461int
462ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
463{
464	char realfsfile[PATH_MAX];
465	int i;
466
467	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
468		/* the root file system can always be remounted */
469		return (0);
470
471	/* The user may have specified a symlink in fstab, resolve the path */
472	if (realpath(fs->fs_file, realfsfile) == NULL) {
473		/* Cannot resolve the path, use original one */
474		strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
475	}
476
477	for (i = mntsize - 1; i >= 0; --i)
478		if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
479		    (!isremountable(fs->fs_vfstype) ||
480		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
481			return (1);
482	return (0);
483}
484
485int
486isremountable(const char *vfsname)
487{
488	const char **cp;
489
490	for (cp = remountable_fs_names; *cp; cp++)
491		if (strcmp(*cp, vfsname) == 0)
492			return (1);
493	return (0);
494}
495
496int
497hasopt(const char *mntopts, const char *option)
498{
499	int negative, found;
500	char *opt, *optbuf;
501
502	if (option[0] == 'n' && option[1] == 'o') {
503		negative = 1;
504		option += 2;
505	} else
506		negative = 0;
507	optbuf = strdup(mntopts);
508	found = 0;
509	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
510		if (opt[0] == 'n' && opt[1] == 'o') {
511			if (!strcasecmp(opt + 2, option))
512				found = negative;
513		} else if (!strcasecmp(opt, option))
514			found = !negative;
515	}
516	free(optbuf);
517	return (found);
518}
519
520static void
521append_arg(struct cpa *sa, char *arg)
522{
523	if (sa->c + 1 == sa->sz) {
524		sa->sz = sa->sz == 0 ? 8 : sa->sz * 2;
525		sa->a = realloc(sa->a, sizeof(sa->a) * sa->sz);
526		if (sa->a == NULL)
527			errx(1, "realloc failed");
528	}
529	sa->a[++sa->c] = arg;
530}
531
532int
533mountfs(const char *vfstype, const char *spec, const char *name, int flags,
534	const char *options, const char *mntopts)
535{
536	struct statfs sf;
537	int i, ret;
538	char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
539	static struct cpa mnt_argv;
540
541	/* resolve the mountpoint with realpath(3) */
542	(void)checkpath(name, mntpath);
543	name = mntpath;
544
545	if (mntopts == NULL)
546		mntopts = "";
547	optbuf = catopt(strdup(mntopts), options);
548
549	if (strcmp(name, "/") == 0)
550		flags |= MNT_UPDATE;
551	if (flags & MNT_FORCE)
552		optbuf = catopt(optbuf, "force");
553	if (flags & MNT_RDONLY)
554		optbuf = catopt(optbuf, "ro");
555	/*
556	 * XXX
557	 * The mount_mfs (newfs) command uses -o to select the
558	 * optimization mode.  We don't pass the default "-o rw"
559	 * for that reason.
560	 */
561	if (flags & MNT_UPDATE)
562		optbuf = catopt(optbuf, "update");
563
564	/* Compatibility glue. */
565	if (strcmp(vfstype, "msdos") == 0) {
566		warnx(
567		    "Using \"-t msdosfs\", since \"-t msdos\" is deprecated.");
568		vfstype = "msdosfs";
569	}
570
571	/* Construct the name of the appropriate mount command */
572	(void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
573
574	mnt_argv.c = -1;
575	append_arg(&mnt_argv, execname);
576	mangle(optbuf, &mnt_argv);
577	if (mountprog != NULL)
578		strcpy(execname, mountprog);
579
580	append_arg(&mnt_argv, strdup(spec));
581	append_arg(&mnt_argv, strdup(name));
582	append_arg(&mnt_argv, NULL);
583
584	if (debug) {
585		if (use_mountprog(vfstype))
586			printf("exec: %s", execname);
587		else
588			printf("mount -t %s", vfstype);
589		for (i = 1; i < mnt_argv.c; i++)
590			(void)printf(" %s", mnt_argv.a[i]);
591		(void)printf("\n");
592		free(optbuf);
593		free(mountprog);
594		mountprog = NULL;
595		return (0);
596	}
597
598	if (use_mountprog(vfstype)) {
599		ret = exec_mountprog(name, execname, mnt_argv.a);
600	} else {
601		ret = mount_fs(vfstype, mnt_argv.c, mnt_argv.a);
602	}
603
604	free(optbuf);
605	free(mountprog);
606	mountprog = NULL;
607
608	if (verbose) {
609		if (statfs(name, &sf) < 0) {
610			warn("statfs %s", name);
611			return (1);
612		}
613		if (fstab_style)
614			putfsent(&sf);
615		else
616			prmount(&sf);
617	}
618
619	return (ret);
620}
621
622void
623prmount(struct statfs *sfp)
624{
625	uint64_t flags;
626	unsigned int i;
627	struct opt *o;
628	struct passwd *pw;
629
630	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
631	    sfp->f_fstypename);
632
633	flags = sfp->f_flags & MNT_VISFLAGMASK;
634	for (o = optnames; flags != 0 && o->o_opt != 0; o++)
635		if (flags & o->o_opt) {
636			(void)printf(", %s", o->o_name);
637			flags &= ~o->o_opt;
638		}
639	/*
640	 * Inform when file system is mounted by an unprivileged user
641	 * or privileged non-root user.
642	 */
643	if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
644		(void)printf(", mounted by ");
645		if ((pw = getpwuid(sfp->f_owner)) != NULL)
646			(void)printf("%s", pw->pw_name);
647		else
648			(void)printf("%d", sfp->f_owner);
649	}
650	if (verbose) {
651		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
652			(void)printf(", writes: sync %ju async %ju",
653			    (uintmax_t)sfp->f_syncwrites,
654			    (uintmax_t)sfp->f_asyncwrites);
655		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
656			(void)printf(", reads: sync %ju async %ju",
657			    (uintmax_t)sfp->f_syncreads,
658			    (uintmax_t)sfp->f_asyncreads);
659		if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
660			printf(", fsid ");
661			for (i = 0; i < sizeof(sfp->f_fsid); i++)
662				printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
663		}
664	}
665	(void)printf(")\n");
666}
667
668struct statfs *
669getmntpt(const char *name)
670{
671	struct statfs *mntbuf;
672	int i, mntsize;
673
674	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
675	for (i = mntsize - 1; i >= 0; i--) {
676		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
677		    strcmp(mntbuf[i].f_mntonname, name) == 0)
678			return (&mntbuf[i]);
679	}
680	return (NULL);
681}
682
683char *
684catopt(char *s0, const char *s1)
685{
686	size_t i;
687	char *cp;
688
689	if (s1 == NULL || *s1 == '\0')
690		return (s0);
691
692	if (s0 && *s0) {
693		i = strlen(s0) + strlen(s1) + 1 + 1;
694		if ((cp = malloc(i)) == NULL)
695			errx(1, "malloc failed");
696		(void)snprintf(cp, i, "%s,%s", s0, s1);
697	} else
698		cp = strdup(s1);
699
700	if (s0)
701		free(s0);
702	return (cp);
703}
704
705void
706mangle(char *options, struct cpa *a)
707{
708	char *p, *s, *val;
709
710	for (s = options; (p = strsep(&s, ",")) != NULL;)
711		if (*p != '\0') {
712			if (strcmp(p, "noauto") == 0) {
713				/*
714				 * Do not pass noauto option to nmount().
715				 * or external mount program.  noauto is
716				 * only used to prevent mounting a filesystem
717				 * when 'mount -a' is specified, and is
718				 * not a real mount option.
719				 */
720				continue;
721			} else if (strcmp(p, "late") == 0) {
722				/*
723				 * "late" is used to prevent certain file
724				 * systems from being mounted before late
725				 * in the boot cycle; for instance,
726				 * loopback NFS mounts can't be mounted
727				 * before mountd starts.
728				 */
729				continue;
730			} else if (strcmp(p, "failok") == 0) {
731				/*
732				 * "failok" is used to prevent certain file
733				 * systems from being causing the system to
734				 * drop into single user mode in the boot
735				 * cycle, and is not a real mount option.
736				 */
737				continue;
738			} else if (strncmp(p, "mountprog", 9) == 0) {
739				/*
740				 * "mountprog" is used to force the use of
741				 * userland mount programs.
742				 */
743				val = strchr(p, '=');
744                        	if (val != NULL) {
745                                	++val;
746					if (*val != '\0')
747						mountprog = strdup(val);
748				}
749
750				if (mountprog == NULL) {
751					errx(1, "Need value for -o mountprog");
752				}
753				continue;
754			} else if (strcmp(p, "userquota") == 0) {
755				continue;
756			} else if (strncmp(p, userquotaeq,
757			    sizeof(userquotaeq) - 1) == 0) {
758				continue;
759			} else if (strcmp(p, "groupquota") == 0) {
760				continue;
761			} else if (strncmp(p, groupquotaeq,
762			    sizeof(groupquotaeq) - 1) == 0) {
763				continue;
764			} else if (*p == '-') {
765				append_arg(a, p);
766				p = strchr(p, '=');
767				if (p != NULL) {
768					*p = '\0';
769					append_arg(a, p + 1);
770				}
771			} else {
772				append_arg(a, strdup("-o"));
773				append_arg(a, p);
774			}
775		}
776}
777
778
779char *
780update_options(char *opts, char *fstab, int curflags)
781{
782	char *o, *p;
783	char *cur;
784	char *expopt, *newopt, *tmpopt;
785
786	if (opts == NULL)
787		return (strdup(""));
788
789	/* remove meta options from list */
790	remopt(fstab, MOUNT_META_OPTION_FSTAB);
791	remopt(fstab, MOUNT_META_OPTION_CURRENT);
792	cur = flags2opts(curflags);
793
794	/*
795	 * Expand all meta-options passed to us first.
796	 */
797	expopt = NULL;
798	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
799		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
800			expopt = catopt(expopt, fstab);
801		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
802			expopt = catopt(expopt, cur);
803		else
804			expopt = catopt(expopt, o);
805	}
806	free(cur);
807	free(opts);
808
809	/*
810	 * Remove previous contradictory arguments. Given option "foo" we
811	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
812	 * and "foo" - so we can deal with possible options like "notice".
813	 */
814	newopt = NULL;
815	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
816		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
817			errx(1, "malloc failed");
818
819		strcpy(tmpopt, "no");
820		strcat(tmpopt, o);
821		remopt(newopt, tmpopt);
822		free(tmpopt);
823
824		if (strncmp("no", o, 2) == 0)
825			remopt(newopt, o+2);
826
827		newopt = catopt(newopt, o);
828	}
829	free(expopt);
830
831	return (newopt);
832}
833
834void
835remopt(char *string, const char *opt)
836{
837	char *o, *p, *r;
838
839	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
840		return;
841
842	r = string;
843
844	for (p = string; (o = strsep(&p, ",")) != NULL;) {
845		if (strcmp(opt, o) != 0) {
846			if (*r == ',' && *o != '\0')
847				r++;
848			while ((*r++ = *o++) != '\0')
849			    ;
850			*--r = ',';
851		}
852	}
853	*r = '\0';
854}
855
856void
857usage(void)
858{
859
860	(void)fprintf(stderr, "%s\n%s\n%s\n",
861"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
862"       mount [-dfpruvw] special | node",
863"       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
864	exit(1);
865}
866
867void
868putfsent(struct statfs *ent)
869{
870	struct fstab *fst;
871	char *opts, *rw;
872	int l;
873
874	opts = NULL;
875	/* flags2opts() doesn't return the "rw" option. */
876	if ((ent->f_flags & MNT_RDONLY) != 0)
877		rw = NULL;
878	else
879		rw = catopt(NULL, "rw");
880
881	opts = flags2opts(ent->f_flags);
882	opts = catopt(rw, opts);
883
884	if (strncmp(ent->f_mntfromname, "<below>", 7) == 0 ||
885	    strncmp(ent->f_mntfromname, "<above>", 7) == 0) {
886		strcpy(ent->f_mntfromname, (strnstr(ent->f_mntfromname, ":", 8)
887		    +1));
888	}
889
890	l = strlen(ent->f_mntfromname);
891	printf("%s%s%s%s", ent->f_mntfromname,
892	    l < 8 ? "\t" : "",
893	    l < 16 ? "\t" : "",
894	    l < 24 ? "\t" : " ");
895	l = strlen(ent->f_mntonname);
896	printf("%s%s%s%s", ent->f_mntonname,
897	    l < 8 ? "\t" : "",
898	    l < 16 ? "\t" : "",
899	    l < 24 ? "\t" : " ");
900	printf("%s\t", ent->f_fstypename);
901	l = strlen(opts);
902	printf("%s%s", opts,
903	    l < 8 ? "\t" : " ");
904	free(opts);
905
906	if ((fst = getfsspec(ent->f_mntfromname)))
907		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
908	else if ((fst = getfsfile(ent->f_mntonname)))
909		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
910	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
911		if (strcmp(ent->f_mntonname, "/") == 0)
912			printf("\t1 1\n");
913		else
914			printf("\t2 2\n");
915	} else
916		printf("\t0 0\n");
917}
918
919
920char *
921flags2opts(int flags)
922{
923	char *res;
924
925	res = NULL;
926
927	if (flags & MNT_RDONLY)		res = catopt(res, "ro");
928	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
929	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
930	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
931	if (flags & MNT_UNION)		res = catopt(res, "union");
932	if (flags & MNT_ASYNC)		res = catopt(res, "async");
933	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
934	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
935	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
936	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
937	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
938	if (flags & MNT_MULTILABEL)	res = catopt(res, "multilabel");
939	if (flags & MNT_ACLS)		res = catopt(res, "acls");
940	if (flags & MNT_NFS4ACLS)	res = catopt(res, "nfsv4acls");
941
942	return (res);
943}
944