mount.c revision 221124 
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: head/sbin/mount/mount.c 221124 2011-04-27 17:51:51Z rmacklem $");
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_MULTILABEL,	"multilabel" },
113	{ MNT_ACLS,		"acls" },
114	{ MNT_NFS4ACLS,		"nfsv4acls" },
115	{ MNT_GJOURNAL,		"gjournal" },
116	{ 0, NULL }
117};
118
119/*
120 * List of VFS types that can be remounted without becoming mounted on top
121 * of each other.
122 * XXX Is this list correct?
123 */
124static const char *
125remountable_fs_names[] = {
126	"ufs", "ffs", "ext2fs",
127	0
128};
129
130static const char userquotaeq[] = "userquota=";
131static const char groupquotaeq[] = "groupquota=";
132
133static char *mountprog = NULL;
134
135static int
136use_mountprog(const char *vfstype)
137{
138	/* XXX: We need to get away from implementing external mount
139	 *      programs for every filesystem, and move towards having
140	 *	each filesystem properly implement the nmount() system call.
141	 */
142	unsigned int i;
143	const char *fs[] = {
144	"cd9660", "mfs", "msdosfs", "nfs", "ntfs",
145	"nwfs", "nullfs", "oldnfs", "portalfs", "smbfs", "udf", "unionfs",
146	NULL
147	};
148
149	if (mountprog != NULL)
150		return (1);
151
152	for (i = 0; fs[i] != NULL; ++i) {
153		if (strcmp(vfstype, fs[i]) == 0)
154			return (1);
155	}
156
157	return (0);
158}
159
160static int
161exec_mountprog(const char *name, const char *execname, char *const argv[])
162{
163	pid_t pid;
164	int status;
165
166	switch (pid = fork()) {
167	case -1:				/* Error. */
168		warn("fork");
169		exit (1);
170	case 0:					/* Child. */
171		/* Go find an executable. */
172		execvP(execname, _PATH_SYSPATH, argv);
173		if (errno == ENOENT) {
174			warn("exec %s not found", execname);
175			if (execname[0] != '/') {
176				warnx("in path: %s", _PATH_SYSPATH);
177			}
178		}
179		exit(1);
180	default:				/* Parent. */
181		if (waitpid(pid, &status, 0) < 0) {
182			warn("waitpid");
183			return (1);
184		}
185
186		if (WIFEXITED(status)) {
187			if (WEXITSTATUS(status) != 0)
188				return (WEXITSTATUS(status));
189		} else if (WIFSIGNALED(status)) {
190			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
191			return (1);
192		}
193		break;
194	}
195
196	return (0);
197}
198
199static int
200specified_ro(const char *arg)
201{
202	char *optbuf, *opt;
203	int ret = 0;
204
205	optbuf = strdup(arg);
206	if (optbuf == NULL)
207		 err(1, NULL);
208
209	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
210		if (strcmp(opt, "ro") == 0) {
211			ret = 1;
212			break;
213		}
214	}
215	free(optbuf);
216	return (ret);
217}
218
219static void
220restart_mountd(void)
221{
222	struct pidfh *pfh;
223	pid_t mountdpid;
224
225	pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
226	if (pfh != NULL) {
227		/* Mountd is not running. */
228		pidfile_remove(pfh);
229		return;
230	}
231	if (errno != EEXIST) {
232		/* Cannot open pidfile for some reason. */
233		return;
234	}
235	/* We have mountd(8) PID in mountdpid varible, let's signal it. */
236	if (kill(mountdpid, SIGHUP) == -1)
237		err(1, "signal mountd");
238}
239
240int
241main(int argc, char *argv[])
242{
243	const char *mntfromname, **vfslist, *vfstype;
244	struct fstab *fs;
245	struct statfs *mntbuf;
246	int all, ch, i, init_flags, late, mntsize, rval, have_fstab, ro;
247	char *cp, *ep, *options;
248
249	all = init_flags = late = 0;
250	ro = 0;
251	options = NULL;
252	vfslist = NULL;
253	vfstype = "ufs";
254	while ((ch = getopt(argc, argv, "adF:flo:prt:uvw")) != -1)
255		switch (ch) {
256		case 'a':
257			all = 1;
258			break;
259		case 'd':
260			debug = 1;
261			break;
262		case 'F':
263			setfstab(optarg);
264			break;
265		case 'f':
266			init_flags |= MNT_FORCE;
267			break;
268		case 'l':
269			late = 1;
270			break;
271		case 'o':
272			if (*optarg) {
273				options = catopt(options, optarg);
274				if (specified_ro(optarg))
275					ro = 1;
276			}
277			break;
278		case 'p':
279			fstab_style = 1;
280			verbose = 1;
281			break;
282		case 'r':
283			options = catopt(options, "ro");
284			ro = 1;
285			break;
286		case 't':
287			if (vfslist != NULL)
288				errx(1, "only one -t option may be specified");
289			vfslist = makevfslist(optarg);
290			vfstype = optarg;
291			break;
292		case 'u':
293			init_flags |= MNT_UPDATE;
294			break;
295		case 'v':
296			verbose = 1;
297			break;
298		case 'w':
299			options = catopt(options, "noro");
300			break;
301		case '?':
302		default:
303			usage();
304			/* NOTREACHED */
305		}
306	argc -= optind;
307	argv += optind;
308
309#define	BADTYPE(type)							\
310	(strcmp(type, FSTAB_RO) &&					\
311	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
312
313	if ((init_flags & MNT_UPDATE) && (ro == 0))
314		options = catopt(options, "noro");
315
316	rval = 0;
317	switch (argc) {
318	case 0:
319		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
320			err(1, "getmntinfo");
321		if (all) {
322			while ((fs = getfsent()) != NULL) {
323				if (BADTYPE(fs->fs_type))
324					continue;
325				if (checkvfsname(fs->fs_vfstype, vfslist))
326					continue;
327				if (hasopt(fs->fs_mntops, "noauto"))
328					continue;
329				if (hasopt(fs->fs_mntops, "late") && !late)
330					continue;
331				if (!(init_flags & MNT_UPDATE) &&
332				    ismounted(fs, mntbuf, mntsize))
333					continue;
334				options = update_options(options, fs->fs_mntops,
335				    mntbuf->f_flags);
336				if (mountfs(fs->fs_vfstype, fs->fs_spec,
337				    fs->fs_file, init_flags, options,
338				    fs->fs_mntops))
339					rval = 1;
340			}
341		} else if (fstab_style) {
342			for (i = 0; i < mntsize; i++) {
343				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
344					continue;
345				putfsent(&mntbuf[i]);
346			}
347		} else {
348			for (i = 0; i < mntsize; i++) {
349				if (checkvfsname(mntbuf[i].f_fstypename,
350				    vfslist))
351					continue;
352				if (!verbose &&
353				    (mntbuf[i].f_flags & MNT_IGNORE) != 0)
354					continue;
355				prmount(&mntbuf[i]);
356			}
357		}
358		exit(rval);
359	case 1:
360		if (vfslist != NULL)
361			usage();
362
363		rmslashes(*argv, *argv);
364		if (init_flags & MNT_UPDATE) {
365			mntfromname = NULL;
366			have_fstab = 0;
367			if ((mntbuf = getmntpt(*argv)) == NULL)
368				errx(1, "not currently mounted %s", *argv);
369			/*
370			 * Only get the mntflags from fstab if both mntpoint
371			 * and mntspec are identical. Also handle the special
372			 * case where just '/' is mounted and 'spec' is not
373			 * identical with the one from fstab ('/dev' is missing
374			 * in the spec-string at boot-time).
375			 */
376			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
377				if (strcmp(fs->fs_spec,
378				    mntbuf->f_mntfromname) == 0 &&
379				    strcmp(fs->fs_file,
380				    mntbuf->f_mntonname) == 0) {
381					have_fstab = 1;
382					mntfromname = mntbuf->f_mntfromname;
383				} else if (argv[0][0] == '/' &&
384				    argv[0][1] == '\0') {
385					fs = getfsfile("/");
386					have_fstab = 1;
387					mntfromname = fs->fs_spec;
388				}
389			}
390			if (have_fstab) {
391				options = update_options(options, fs->fs_mntops,
392				    mntbuf->f_flags);
393			} else {
394				mntfromname = mntbuf->f_mntfromname;
395				options = update_options(options, NULL,
396				    mntbuf->f_flags);
397			}
398			rval = mountfs(mntbuf->f_fstypename, mntfromname,
399			    mntbuf->f_mntonname, init_flags, options, 0);
400			break;
401		}
402		if ((fs = getfsfile(*argv)) == NULL &&
403		    (fs = getfsspec(*argv)) == NULL)
404			errx(1, "%s: unknown special file or file system",
405			    *argv);
406		if (BADTYPE(fs->fs_type))
407			errx(1, "%s has unknown file system type",
408			    *argv);
409		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
410		    init_flags, options, fs->fs_mntops);
411		break;
412	case 2:
413		/*
414		 * If -t flag has not been specified, the path cannot be
415		 * found, spec contains either a ':' or a '@', then assume
416		 * that an NFS file system is being specified ala Sun.
417		 * Check if the hostname contains only allowed characters
418		 * to reduce false positives.  IPv6 addresses containing
419		 * ':' will be correctly parsed only if the separator is '@'.
420		 * The definition of a valid hostname is taken from RFC 1034.
421		 */
422		if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
423		    (ep = strchr(argv[0], ':')) != NULL)) {
424			if (*ep == '@') {
425				cp = ep + 1;
426				ep = cp + strlen(cp);
427			} else
428				cp = argv[0];
429			while (cp != ep) {
430				if (!isdigit(*cp) && !isalpha(*cp) &&
431				    *cp != '.' && *cp != '-' && *cp != ':')
432					break;
433				cp++;
434			}
435			if (cp == ep)
436				vfstype = "nfs";
437		}
438		rval = mountfs(vfstype,
439		    argv[0], argv[1], init_flags, options, NULL);
440		break;
441	default:
442		usage();
443		/* NOTREACHED */
444	}
445
446	/*
447	 * If the mount was successfully, and done by root, tell mountd the
448	 * good news.
449	 */
450	if (rval == 0 && getuid() == 0)
451		restart_mountd();
452
453	exit(rval);
454}
455
456int
457ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
458{
459	char realfsfile[PATH_MAX];
460	int i;
461
462	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
463		/* the root file system can always be remounted */
464		return (0);
465
466	/* The user may have specified a symlink in fstab, resolve the path */
467	if (realpath(fs->fs_file, realfsfile) == NULL) {
468		/* Cannot resolve the path, use original one */
469		strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
470	}
471
472	for (i = mntsize - 1; i >= 0; --i)
473		if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
474		    (!isremountable(fs->fs_vfstype) ||
475		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
476			return (1);
477	return (0);
478}
479
480int
481isremountable(const char *vfsname)
482{
483	const char **cp;
484
485	for (cp = remountable_fs_names; *cp; cp++)
486		if (strcmp(*cp, vfsname) == 0)
487			return (1);
488	return (0);
489}
490
491int
492hasopt(const char *mntopts, const char *option)
493{
494	int negative, found;
495	char *opt, *optbuf;
496
497	if (option[0] == 'n' && option[1] == 'o') {
498		negative = 1;
499		option += 2;
500	} else
501		negative = 0;
502	optbuf = strdup(mntopts);
503	found = 0;
504	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
505		if (opt[0] == 'n' && opt[1] == 'o') {
506			if (!strcasecmp(opt + 2, option))
507				found = negative;
508		} else if (!strcasecmp(opt, option))
509			found = !negative;
510	}
511	free(optbuf);
512	return (found);
513}
514
515static void
516append_arg(struct cpa *sa, char *arg)
517{
518	if (sa->c + 1 == sa->sz) {
519		sa->sz = sa->sz == 0 ? 8 : sa->sz * 2;
520		sa->a = realloc(sa->a, sizeof(sa->a) * sa->sz);
521		if (sa->a == NULL)
522			errx(1, "realloc failed");
523	}
524	sa->a[++sa->c] = arg;
525}
526
527int
528mountfs(const char *vfstype, const char *spec, const char *name, int flags,
529	const char *options, const char *mntopts)
530{
531	struct statfs sf;
532	int i, ret;
533	char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
534	static struct cpa mnt_argv;
535
536	/* resolve the mountpoint with realpath(3) */
537	(void)checkpath(name, mntpath);
538	name = mntpath;
539
540	if (mntopts == NULL)
541		mntopts = "";
542	optbuf = catopt(strdup(mntopts), options);
543
544	if (strcmp(name, "/") == 0)
545		flags |= MNT_UPDATE;
546	if (flags & MNT_FORCE)
547		optbuf = catopt(optbuf, "force");
548	if (flags & MNT_RDONLY)
549		optbuf = catopt(optbuf, "ro");
550	/*
551	 * XXX
552	 * The mount_mfs (newfs) command uses -o to select the
553	 * optimization mode.  We don't pass the default "-o rw"
554	 * for that reason.
555	 */
556	if (flags & MNT_UPDATE)
557		optbuf = catopt(optbuf, "update");
558
559	/* Compatibility glue. */
560	if (strcmp(vfstype, "msdos") == 0) {
561		warnx(
562		    "Using \"-t msdosfs\", since \"-t msdos\" is deprecated.");
563		vfstype = "msdosfs";
564	}
565
566	/* Construct the name of the appropriate mount command */
567	(void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
568
569	mnt_argv.c = -1;
570	append_arg(&mnt_argv, execname);
571	mangle(optbuf, &mnt_argv);
572	if (mountprog != NULL)
573		strcpy(execname, mountprog);
574
575	append_arg(&mnt_argv, strdup(spec));
576	append_arg(&mnt_argv, strdup(name));
577	append_arg(&mnt_argv, NULL);
578
579	if (debug) {
580		if (use_mountprog(vfstype))
581			printf("exec: %s", execname);
582		else
583			printf("mount -t %s", vfstype);
584		for (i = 1; i < mnt_argv.c; i++)
585			(void)printf(" %s", mnt_argv.a[i]);
586		(void)printf("\n");
587		return (0);
588	}
589
590	if (use_mountprog(vfstype)) {
591		ret = exec_mountprog(name, execname, mnt_argv.a);
592	} else {
593		ret = mount_fs(vfstype, mnt_argv.c, mnt_argv.a);
594	}
595
596	free(optbuf);
597
598	if (verbose) {
599		if (statfs(name, &sf) < 0) {
600			warn("statfs %s", name);
601			return (1);
602		}
603		if (fstab_style)
604			putfsent(&sf);
605		else
606			prmount(&sf);
607	}
608
609	return (ret);
610}
611
612void
613prmount(struct statfs *sfp)
614{
615	uint64_t flags;
616	unsigned int i;
617	struct opt *o;
618	struct passwd *pw;
619
620	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
621	    sfp->f_fstypename);
622
623	flags = sfp->f_flags & MNT_VISFLAGMASK;
624	for (o = optnames; flags != 0 && o->o_opt != 0; o++)
625		if (flags & o->o_opt) {
626			(void)printf(", %s", o->o_name);
627			flags &= ~o->o_opt;
628		}
629	/*
630	 * Inform when file system is mounted by an unprivileged user
631	 * or privileged non-root user.
632	 */
633	if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
634		(void)printf(", mounted by ");
635		if ((pw = getpwuid(sfp->f_owner)) != NULL)
636			(void)printf("%s", pw->pw_name);
637		else
638			(void)printf("%d", sfp->f_owner);
639	}
640	if (verbose) {
641		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
642			(void)printf(", writes: sync %ju async %ju",
643			    (uintmax_t)sfp->f_syncwrites,
644			    (uintmax_t)sfp->f_asyncwrites);
645		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
646			(void)printf(", reads: sync %ju async %ju",
647			    (uintmax_t)sfp->f_syncreads,
648			    (uintmax_t)sfp->f_asyncreads);
649		if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
650			printf(", fsid ");
651			for (i = 0; i < sizeof(sfp->f_fsid); i++)
652				printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
653		}
654	}
655	(void)printf(")\n");
656}
657
658struct statfs *
659getmntpt(const char *name)
660{
661	struct statfs *mntbuf;
662	int i, mntsize;
663
664	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
665	for (i = mntsize - 1; i >= 0; i--) {
666		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
667		    strcmp(mntbuf[i].f_mntonname, name) == 0)
668			return (&mntbuf[i]);
669	}
670	return (NULL);
671}
672
673char *
674catopt(char *s0, const char *s1)
675{
676	size_t i;
677	char *cp;
678
679	if (s1 == NULL || *s1 == '\0')
680		return (s0);
681
682	if (s0 && *s0) {
683		i = strlen(s0) + strlen(s1) + 1 + 1;
684		if ((cp = malloc(i)) == NULL)
685			errx(1, "malloc failed");
686		(void)snprintf(cp, i, "%s,%s", s0, s1);
687	} else
688		cp = strdup(s1);
689
690	if (s0)
691		free(s0);
692	return (cp);
693}
694
695void
696mangle(char *options, struct cpa *a)
697{
698	char *p, *s, *val;
699
700	for (s = options; (p = strsep(&s, ",")) != NULL;)
701		if (*p != '\0') {
702			if (strcmp(p, "noauto") == 0) {
703				/*
704				 * Do not pass noauto option to nmount().
705				 * or external mount program.  noauto is
706				 * only used to prevent mounting a filesystem
707				 * when 'mount -a' is specified, and is
708				 * not a real mount option.
709				 */
710				continue;
711			} else if (strcmp(p, "late") == 0) {
712				/*
713				 * "late" is used to prevent certain file
714				 * systems from being mounted before late
715				 * in the boot cycle; for instance,
716				 * loopback NFS mounts can't be mounted
717				 * before mountd starts.
718				 */
719				continue;
720			} else if (strncmp(p, "mountprog", 9) == 0) {
721				/*
722				 * "mountprog" is used to force the use of
723				 * userland mount programs.
724				 */
725				val = strchr(p, '=');
726                        	if (val != NULL) {
727                                	++val;
728					if (*val != '\0')
729						mountprog = strdup(val);
730				}
731
732				if (mountprog == NULL) {
733					errx(1, "Need value for -o mountprog");
734				}
735				continue;
736			} else if (strcmp(p, "userquota") == 0) {
737				continue;
738			} else if (strncmp(p, userquotaeq,
739			    sizeof(userquotaeq) - 1) == 0) {
740				continue;
741			} else if (strcmp(p, "groupquota") == 0) {
742				continue;
743			} else if (strncmp(p, groupquotaeq,
744			    sizeof(groupquotaeq) - 1) == 0) {
745				continue;
746			} else if (*p == '-') {
747				append_arg(a, p);
748				p = strchr(p, '=');
749				if (p != NULL) {
750					*p = '\0';
751					append_arg(a, p + 1);
752				}
753			} else {
754				append_arg(a, strdup("-o"));
755				append_arg(a, p);
756			}
757		}
758}
759
760
761char *
762update_options(char *opts, char *fstab, int curflags)
763{
764	char *o, *p;
765	char *cur;
766	char *expopt, *newopt, *tmpopt;
767
768	if (opts == NULL)
769		return (strdup(""));
770
771	/* remove meta options from list */
772	remopt(fstab, MOUNT_META_OPTION_FSTAB);
773	remopt(fstab, MOUNT_META_OPTION_CURRENT);
774	cur = flags2opts(curflags);
775
776	/*
777	 * Expand all meta-options passed to us first.
778	 */
779	expopt = NULL;
780	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
781		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
782			expopt = catopt(expopt, fstab);
783		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
784			expopt = catopt(expopt, cur);
785		else
786			expopt = catopt(expopt, o);
787	}
788	free(cur);
789	free(opts);
790
791	/*
792	 * Remove previous contradictory arguments. Given option "foo" we
793	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
794	 * and "foo" - so we can deal with possible options like "notice".
795	 */
796	newopt = NULL;
797	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
798		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
799			errx(1, "malloc failed");
800
801		strcpy(tmpopt, "no");
802		strcat(tmpopt, o);
803		remopt(newopt, tmpopt);
804		free(tmpopt);
805
806		if (strncmp("no", o, 2) == 0)
807			remopt(newopt, o+2);
808
809		newopt = catopt(newopt, o);
810	}
811	free(expopt);
812
813	return (newopt);
814}
815
816void
817remopt(char *string, const char *opt)
818{
819	char *o, *p, *r;
820
821	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
822		return;
823
824	r = string;
825
826	for (p = string; (o = strsep(&p, ",")) != NULL;) {
827		if (strcmp(opt, o) != 0) {
828			if (*r == ',' && *o != '\0')
829				r++;
830			while ((*r++ = *o++) != '\0')
831			    ;
832			*--r = ',';
833		}
834	}
835	*r = '\0';
836}
837
838void
839usage(void)
840{
841
842	(void)fprintf(stderr, "%s\n%s\n%s\n",
843"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
844"       mount [-dfpruvw] special | node",
845"       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
846	exit(1);
847}
848
849void
850putfsent(struct statfs *ent)
851{
852	struct fstab *fst;
853	char *opts, *rw;
854	int l;
855
856	opts = NULL;
857	/* flags2opts() doesn't return the "rw" option. */
858	if ((ent->f_flags & MNT_RDONLY) != 0)
859		rw = NULL;
860	else
861		rw = catopt(NULL, "rw");
862
863	opts = flags2opts(ent->f_flags);
864	opts = catopt(rw, opts);
865
866	if (strncmp(ent->f_mntfromname, "<below>", 7) == 0 ||
867	    strncmp(ent->f_mntfromname, "<above>", 7) == 0) {
868		strcpy(ent->f_mntfromname, (strnstr(ent->f_mntfromname, ":", 8)
869		    +1));
870	}
871
872	l = strlen(ent->f_mntfromname);
873	printf("%s%s%s%s", ent->f_mntfromname,
874	    l < 8 ? "\t" : "",
875	    l < 16 ? "\t" : "",
876	    l < 24 ? "\t" : " ");
877	l = strlen(ent->f_mntonname);
878	printf("%s%s%s%s", ent->f_mntonname,
879	    l < 8 ? "\t" : "",
880	    l < 16 ? "\t" : "",
881	    l < 24 ? "\t" : " ");
882	printf("%s\t", ent->f_fstypename);
883	l = strlen(opts);
884	printf("%s%s", opts,
885	    l < 8 ? "\t" : " ");
886	free(opts);
887
888	if ((fst = getfsspec(ent->f_mntfromname)))
889		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
890	else if ((fst = getfsfile(ent->f_mntonname)))
891		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
892	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
893		if (strcmp(ent->f_mntonname, "/") == 0)
894			printf("\t1 1\n");
895		else
896			printf("\t2 2\n");
897	} else
898		printf("\t0 0\n");
899}
900
901
902char *
903flags2opts(int flags)
904{
905	char *res;
906
907	res = NULL;
908
909	if (flags & MNT_RDONLY)		res = catopt(res, "ro");
910	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
911	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
912	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
913	if (flags & MNT_UNION)		res = catopt(res, "union");
914	if (flags & MNT_ASYNC)		res = catopt(res, "async");
915	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
916	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
917	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
918	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
919	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
920	if (flags & MNT_MULTILABEL)	res = catopt(res, "multilabel");
921	if (flags & MNT_ACLS)		res = catopt(res, "acls");
922	if (flags & MNT_NFS4ACLS)	res = catopt(res, "nfsv4acls");
923
924	return (res);
925}
926