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
69static int 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",
146	"nullfs", "oldnfs", "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	int onlylate;
249	char *cp, *ep, *options;
250
251	all = init_flags = late = onlylate = 0;
252	ro = 0;
253	options = NULL;
254	vfslist = NULL;
255	vfstype = "ufs";
256	while ((ch = getopt(argc, argv, "adF:fLlno:prt:uvw")) != -1)
257		switch (ch) {
258		case 'a':
259			all = 1;
260			break;
261		case 'd':
262			debug = 1;
263			break;
264		case 'F':
265			setfstab(optarg);
266			break;
267		case 'f':
268			init_flags |= MNT_FORCE;
269			break;
270		case 'L':
271			onlylate = 1;
272			late = 1;
273			break;
274		case 'l':
275			late = 1;
276			break;
277		case 'n':
278			/* For compatibility with the Linux version of mount. */
279			break;
280		case 'o':
281			if (*optarg) {
282				options = catopt(options, optarg);
283				if (specified_ro(optarg))
284					ro = 1;
285			}
286			break;
287		case 'p':
288			fstab_style = 1;
289			verbose = 1;
290			break;
291		case 'r':
292			options = catopt(options, "ro");
293			ro = 1;
294			break;
295		case 't':
296			if (vfslist != NULL)
297				errx(1, "only one -t option may be specified");
298			vfslist = makevfslist(optarg);
299			vfstype = optarg;
300			break;
301		case 'u':
302			init_flags |= MNT_UPDATE;
303			break;
304		case 'v':
305			verbose = 1;
306			break;
307		case 'w':
308			options = catopt(options, "noro");
309			break;
310		case '?':
311		default:
312			usage();
313			/* NOTREACHED */
314		}
315	argc -= optind;
316	argv += optind;
317
318#define	BADTYPE(type)							\
319	(strcmp(type, FSTAB_RO) &&					\
320	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
321
322	if ((init_flags & MNT_UPDATE) && (ro == 0))
323		options = catopt(options, "noro");
324
325	rval = 0;
326	switch (argc) {
327	case 0:
328		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
329			err(1, "getmntinfo");
330		if (all) {
331			while ((fs = getfsent()) != NULL) {
332				if (BADTYPE(fs->fs_type))
333					continue;
334				if (checkvfsname(fs->fs_vfstype, vfslist))
335					continue;
336				if (hasopt(fs->fs_mntops, "noauto"))
337					continue;
338				if (!hasopt(fs->fs_mntops, "late") && onlylate)
339					continue;
340				if (hasopt(fs->fs_mntops, "late") && !late)
341					continue;
342				if (hasopt(fs->fs_mntops, "failok"))
343					failok = 1;
344				else
345					failok = 0;
346				if (!(init_flags & MNT_UPDATE) &&
347				    ismounted(fs, mntbuf, mntsize))
348					continue;
349				options = update_options(options, fs->fs_mntops,
350				    mntbuf->f_flags);
351				if (mountfs(fs->fs_vfstype, fs->fs_spec,
352				    fs->fs_file, init_flags, options,
353				    fs->fs_mntops) && !failok)
354					rval = 1;
355			}
356		} else if (fstab_style) {
357			for (i = 0; i < mntsize; i++) {
358				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
359					continue;
360				putfsent(&mntbuf[i]);
361			}
362		} else {
363			for (i = 0; i < mntsize; i++) {
364				if (checkvfsname(mntbuf[i].f_fstypename,
365				    vfslist))
366					continue;
367				if (!verbose &&
368				    (mntbuf[i].f_flags & MNT_IGNORE) != 0)
369					continue;
370				prmount(&mntbuf[i]);
371			}
372		}
373		exit(rval);
374	case 1:
375		if (vfslist != NULL)
376			usage();
377
378		rmslashes(*argv, *argv);
379		if (init_flags & MNT_UPDATE) {
380			mntfromname = NULL;
381			have_fstab = 0;
382			if ((mntbuf = getmntpt(*argv)) == NULL)
383				errx(1, "not currently mounted %s", *argv);
384			/*
385			 * Only get the mntflags from fstab if both mntpoint
386			 * and mntspec are identical. Also handle the special
387			 * case where just '/' is mounted and 'spec' is not
388			 * identical with the one from fstab ('/dev' is missing
389			 * in the spec-string at boot-time).
390			 */
391			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
392				if (strcmp(fs->fs_spec,
393				    mntbuf->f_mntfromname) == 0 &&
394				    strcmp(fs->fs_file,
395				    mntbuf->f_mntonname) == 0) {
396					have_fstab = 1;
397					mntfromname = mntbuf->f_mntfromname;
398				} else if (argv[0][0] == '/' &&
399				    argv[0][1] == '\0') {
400					fs = getfsfile("/");
401					have_fstab = 1;
402					mntfromname = fs->fs_spec;
403				}
404			}
405			if (have_fstab) {
406				options = update_options(options, fs->fs_mntops,
407				    mntbuf->f_flags);
408			} else {
409				mntfromname = mntbuf->f_mntfromname;
410				options = update_options(options, NULL,
411				    mntbuf->f_flags);
412			}
413			rval = mountfs(mntbuf->f_fstypename, mntfromname,
414			    mntbuf->f_mntonname, init_flags, options, 0);
415			break;
416		}
417		if ((fs = getfsfile(*argv)) == NULL &&
418		    (fs = getfsspec(*argv)) == NULL)
419			errx(1, "%s: unknown special file or file system",
420			    *argv);
421		if (BADTYPE(fs->fs_type))
422			errx(1, "%s has unknown file system type",
423			    *argv);
424		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
425		    init_flags, options, fs->fs_mntops);
426		break;
427	case 2:
428		/*
429		 * If -t flag has not been specified, the path cannot be
430		 * found, spec contains either a ':' or a '@', then assume
431		 * that an NFS file system is being specified ala Sun.
432		 * Check if the hostname contains only allowed characters
433		 * to reduce false positives.  IPv6 addresses containing
434		 * ':' will be correctly parsed only if the separator is '@'.
435		 * The definition of a valid hostname is taken from RFC 1034.
436		 */
437		if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
438		    (ep = strchr(argv[0], ':')) != NULL)) {
439			if (*ep == '@') {
440				cp = ep + 1;
441				ep = cp + strlen(cp);
442			} else
443				cp = argv[0];
444			while (cp != ep) {
445				if (!isdigit(*cp) && !isalpha(*cp) &&
446				    *cp != '.' && *cp != '-' && *cp != ':')
447					break;
448				cp++;
449			}
450			if (cp == ep)
451				vfstype = "nfs";
452		}
453		rval = mountfs(vfstype,
454		    argv[0], argv[1], init_flags, options, NULL);
455		break;
456	default:
457		usage();
458		/* NOTREACHED */
459	}
460
461	/*
462	 * If the mount was successfully, and done by root, tell mountd the
463	 * good news.
464	 */
465	if (rval == 0 && getuid() == 0)
466		restart_mountd();
467
468	exit(rval);
469}
470
471int
472ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
473{
474	char realfsfile[PATH_MAX];
475	int i;
476
477	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
478		/* the root file system can always be remounted */
479		return (0);
480
481	/* The user may have specified a symlink in fstab, resolve the path */
482	if (realpath(fs->fs_file, realfsfile) == NULL) {
483		/* Cannot resolve the path, use original one */
484		strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
485	}
486
487	for (i = mntsize - 1; i >= 0; --i)
488		if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
489		    (!isremountable(fs->fs_vfstype) ||
490		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
491			return (1);
492	return (0);
493}
494
495int
496isremountable(const char *vfsname)
497{
498	const char **cp;
499
500	for (cp = remountable_fs_names; *cp; cp++)
501		if (strcmp(*cp, vfsname) == 0)
502			return (1);
503	return (0);
504}
505
506int
507hasopt(const char *mntopts, const char *option)
508{
509	int negative, found;
510	char *opt, *optbuf;
511
512	if (option[0] == 'n' && option[1] == 'o') {
513		negative = 1;
514		option += 2;
515	} else
516		negative = 0;
517	optbuf = strdup(mntopts);
518	found = 0;
519	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
520		if (opt[0] == 'n' && opt[1] == 'o') {
521			if (!strcasecmp(opt + 2, option))
522				found = negative;
523		} else if (!strcasecmp(opt, option))
524			found = !negative;
525	}
526	free(optbuf);
527	return (found);
528}
529
530static void
531append_arg(struct cpa *sa, char *arg)
532{
533	if (sa->c + 1 == sa->sz) {
534		sa->sz = sa->sz == 0 ? 8 : sa->sz * 2;
535		sa->a = realloc(sa->a, sizeof(sa->a) * sa->sz);
536		if (sa->a == NULL)
537			errx(1, "realloc failed");
538	}
539	sa->a[++sa->c] = arg;
540}
541
542int
543mountfs(const char *vfstype, const char *spec, const char *name, int flags,
544	const char *options, const char *mntopts)
545{
546	struct statfs sf;
547	int i, ret;
548	char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
549	static struct cpa mnt_argv;
550
551	/* resolve the mountpoint with realpath(3) */
552	if (checkpath(name, mntpath) != 0) {
553		warn("%s", mntpath);
554		return (1);
555	}
556	name = mntpath;
557
558	if (mntopts == NULL)
559		mntopts = "";
560	optbuf = catopt(strdup(mntopts), options);
561
562	if (strcmp(name, "/") == 0)
563		flags |= MNT_UPDATE;
564	if (flags & MNT_FORCE)
565		optbuf = catopt(optbuf, "force");
566	if (flags & MNT_RDONLY)
567		optbuf = catopt(optbuf, "ro");
568	/*
569	 * XXX
570	 * The mount_mfs (newfs) command uses -o to select the
571	 * optimization mode.  We don't pass the default "-o rw"
572	 * for that reason.
573	 */
574	if (flags & MNT_UPDATE)
575		optbuf = catopt(optbuf, "update");
576
577	/* Compatibility glue. */
578	if (strcmp(vfstype, "msdos") == 0) {
579		warnx(
580		    "Using \"-t msdosfs\", since \"-t msdos\" is deprecated.");
581		vfstype = "msdosfs";
582	}
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		strcpy(execname, mountprog);
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			printf("exec: %s", execname);
600		else
601			printf("mount -t %s", vfstype);
602		for (i = 1; i < mnt_argv.c; i++)
603			(void)printf(" %s", mnt_argv.a[i]);
604		(void)printf("\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			warn("statfs %s", name);
624			return (1);
625		}
626		if (fstab_style)
627			putfsent(&sf);
628		else
629			prmount(&sf);
630	}
631
632	return (ret);
633}
634
635void
636prmount(struct statfs *sfp)
637{
638	uint64_t flags;
639	unsigned int i;
640	struct opt *o;
641	struct passwd *pw;
642
643	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
644	    sfp->f_fstypename);
645
646	flags = sfp->f_flags & MNT_VISFLAGMASK;
647	for (o = optnames; flags != 0 && o->o_opt != 0; o++)
648		if (flags & o->o_opt) {
649			(void)printf(", %s", o->o_name);
650			flags &= ~o->o_opt;
651		}
652	/*
653	 * Inform when file system is mounted by an unprivileged user
654	 * or privileged non-root user.
655	 */
656	if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
657		(void)printf(", mounted by ");
658		if ((pw = getpwuid(sfp->f_owner)) != NULL)
659			(void)printf("%s", pw->pw_name);
660		else
661			(void)printf("%d", sfp->f_owner);
662	}
663	if (verbose) {
664		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
665			(void)printf(", writes: sync %ju async %ju",
666			    (uintmax_t)sfp->f_syncwrites,
667			    (uintmax_t)sfp->f_asyncwrites);
668		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
669			(void)printf(", reads: sync %ju async %ju",
670			    (uintmax_t)sfp->f_syncreads,
671			    (uintmax_t)sfp->f_asyncreads);
672		if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
673			printf(", fsid ");
674			for (i = 0; i < sizeof(sfp->f_fsid); i++)
675				printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
676		}
677	}
678	(void)printf(")\n");
679}
680
681struct statfs *
682getmntpt(const char *name)
683{
684	struct statfs *mntbuf;
685	int i, mntsize;
686
687	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
688	for (i = mntsize - 1; i >= 0; i--) {
689		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
690		    strcmp(mntbuf[i].f_mntonname, name) == 0)
691			return (&mntbuf[i]);
692	}
693	return (NULL);
694}
695
696char *
697catopt(char *s0, const char *s1)
698{
699	size_t i;
700	char *cp;
701
702	if (s1 == NULL || *s1 == '\0')
703		return (s0);
704
705	if (s0 && *s0) {
706		i = strlen(s0) + strlen(s1) + 1 + 1;
707		if ((cp = malloc(i)) == NULL)
708			errx(1, "malloc failed");
709		(void)snprintf(cp, i, "%s,%s", s0, s1);
710	} else
711		cp = strdup(s1);
712
713	if (s0)
714		free(s0);
715	return (cp);
716}
717
718void
719mangle(char *options, struct cpa *a)
720{
721	char *p, *s, *val;
722
723	for (s = options; (p = strsep(&s, ",")) != NULL;)
724		if (*p != '\0') {
725			if (strcmp(p, "noauto") == 0) {
726				/*
727				 * Do not pass noauto option to nmount().
728				 * or external mount program.  noauto is
729				 * only used to prevent mounting a filesystem
730				 * when 'mount -a' is specified, and is
731				 * not a real mount option.
732				 */
733				continue;
734			} else if (strcmp(p, "late") == 0) {
735				/*
736				 * "late" is used to prevent certain file
737				 * systems from being mounted before late
738				 * in the boot cycle; for instance,
739				 * loopback NFS mounts can't be mounted
740				 * before mountd starts.
741				 */
742				continue;
743			} else if (strcmp(p, "failok") == 0) {
744				/*
745				 * "failok" is used to prevent certain file
746				 * systems from being causing the system to
747				 * drop into single user mode in the boot
748				 * cycle, and is not a real mount option.
749				 */
750				continue;
751			} else if (strncmp(p, "mountprog", 9) == 0) {
752				/*
753				 * "mountprog" is used to force the use of
754				 * userland mount programs.
755				 */
756				val = strchr(p, '=');
757                        	if (val != NULL) {
758                                	++val;
759					if (*val != '\0')
760						mountprog = strdup(val);
761				}
762
763				if (mountprog == NULL) {
764					errx(1, "Need value for -o mountprog");
765				}
766				continue;
767			} else if (strcmp(p, "userquota") == 0) {
768				continue;
769			} else if (strncmp(p, userquotaeq,
770			    sizeof(userquotaeq) - 1) == 0) {
771				continue;
772			} else if (strcmp(p, "groupquota") == 0) {
773				continue;
774			} else if (strncmp(p, groupquotaeq,
775			    sizeof(groupquotaeq) - 1) == 0) {
776				continue;
777			} else if (*p == '-') {
778				append_arg(a, p);
779				p = strchr(p, '=');
780				if (p != NULL) {
781					*p = '\0';
782					append_arg(a, p + 1);
783				}
784			} else {
785				append_arg(a, strdup("-o"));
786				append_arg(a, p);
787			}
788		}
789}
790
791
792char *
793update_options(char *opts, char *fstab, int curflags)
794{
795	char *o, *p;
796	char *cur;
797	char *expopt, *newopt, *tmpopt;
798
799	if (opts == NULL)
800		return (strdup(""));
801
802	/* remove meta options from list */
803	remopt(fstab, MOUNT_META_OPTION_FSTAB);
804	remopt(fstab, MOUNT_META_OPTION_CURRENT);
805	cur = flags2opts(curflags);
806
807	/*
808	 * Expand all meta-options passed to us first.
809	 */
810	expopt = NULL;
811	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
812		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
813			expopt = catopt(expopt, fstab);
814		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
815			expopt = catopt(expopt, cur);
816		else
817			expopt = catopt(expopt, o);
818	}
819	free(cur);
820	free(opts);
821
822	/*
823	 * Remove previous contradictory arguments. Given option "foo" we
824	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
825	 * and "foo" - so we can deal with possible options like "notice".
826	 */
827	newopt = NULL;
828	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
829		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
830			errx(1, "malloc failed");
831
832		strcpy(tmpopt, "no");
833		strcat(tmpopt, o);
834		remopt(newopt, tmpopt);
835		free(tmpopt);
836
837		if (strncmp("no", o, 2) == 0)
838			remopt(newopt, o+2);
839
840		newopt = catopt(newopt, o);
841	}
842	free(expopt);
843
844	return (newopt);
845}
846
847void
848remopt(char *string, const char *opt)
849{
850	char *o, *p, *r;
851
852	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
853		return;
854
855	r = string;
856
857	for (p = string; (o = strsep(&p, ",")) != NULL;) {
858		if (strcmp(opt, o) != 0) {
859			if (*r == ',' && *o != '\0')
860				r++;
861			while ((*r++ = *o++) != '\0')
862			    ;
863			*--r = ',';
864		}
865	}
866	*r = '\0';
867}
868
869void
870usage(void)
871{
872
873	(void)fprintf(stderr, "%s\n%s\n%s\n",
874"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
875"       mount [-dfpruvw] special | node",
876"       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
877	exit(1);
878}
879
880void
881putfsent(struct statfs *ent)
882{
883	struct fstab *fst;
884	char *opts, *rw;
885	int l;
886
887	opts = NULL;
888	/* flags2opts() doesn't return the "rw" option. */
889	if ((ent->f_flags & MNT_RDONLY) != 0)
890		rw = NULL;
891	else
892		rw = catopt(NULL, "rw");
893
894	opts = flags2opts(ent->f_flags);
895	opts = catopt(rw, opts);
896
897	if (strncmp(ent->f_mntfromname, "<below>", 7) == 0 ||
898	    strncmp(ent->f_mntfromname, "<above>", 7) == 0) {
899		strcpy(ent->f_mntfromname, (strnstr(ent->f_mntfromname, ":", 8)
900		    +1));
901	}
902
903	l = strlen(ent->f_mntfromname);
904	printf("%s%s%s%s", ent->f_mntfromname,
905	    l < 8 ? "\t" : "",
906	    l < 16 ? "\t" : "",
907	    l < 24 ? "\t" : " ");
908	l = strlen(ent->f_mntonname);
909	printf("%s%s%s%s", ent->f_mntonname,
910	    l < 8 ? "\t" : "",
911	    l < 16 ? "\t" : "",
912	    l < 24 ? "\t" : " ");
913	printf("%s\t", ent->f_fstypename);
914	l = strlen(opts);
915	printf("%s%s", opts,
916	    l < 8 ? "\t" : " ");
917	free(opts);
918
919	if ((fst = getfsspec(ent->f_mntfromname)))
920		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
921	else if ((fst = getfsfile(ent->f_mntonname)))
922		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
923	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
924		if (strcmp(ent->f_mntonname, "/") == 0)
925			printf("\t1 1\n");
926		else
927			printf("\t2 2\n");
928	} else
929		printf("\t0 0\n");
930}
931
932
933char *
934flags2opts(int flags)
935{
936	char *res;
937
938	res = NULL;
939
940	if (flags & MNT_RDONLY)		res = catopt(res, "ro");
941	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
942	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
943	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
944	if (flags & MNT_UNION)		res = catopt(res, "union");
945	if (flags & MNT_ASYNC)		res = catopt(res, "async");
946	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
947	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
948	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
949	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
950	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
951	if (flags & MNT_MULTILABEL)	res = catopt(res, "multilabel");
952	if (flags & MNT_ACLS)		res = catopt(res, "acls");
953	if (flags & MNT_NFS4ACLS)	res = catopt(res, "nfsv4acls");
954
955	return (res);
956}
957