mount.c revision 197200 
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 197200 2009-09-14 21:08:22Z pjd $");
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	int 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_GJOURNAL,		"gjournal" },
115	{ 0, NULL }
116};
117
118/*
119 * List of VFS types that can be remounted without becoming mounted on top
120 * of each other.
121 * XXX Is this list correct?
122 */
123static const char *
124remountable_fs_names[] = {
125	"ufs", "ffs", "ext2fs",
126	0
127};
128
129static const char userquotaeq[] = "userquota=";
130static const char groupquotaeq[] = "groupquota=";
131
132static char *mountprog = NULL;
133
134static int
135use_mountprog(const char *vfstype)
136{
137	/* XXX: We need to get away from implementing external mount
138	 *      programs for every filesystem, and move towards having
139	 *	each filesystem properly implement the nmount() system call.
140	 */
141	unsigned int i;
142	const char *fs[] = {
143	"cd9660", "mfs", "msdosfs", "newnfs", "nfs", "ntfs",
144	"nwfs", "nullfs", "portalfs", "smbfs", "udf", "unionfs",
145	NULL
146	};
147
148	if (mountprog != NULL)
149		return (1);
150
151	for (i = 0; fs[i] != NULL; ++i) {
152		if (strcmp(vfstype, fs[i]) == 0)
153			return (1);
154	}
155
156	return (0);
157}
158
159static int
160exec_mountprog(const char *name, const char *execname, char *const argv[])
161{
162	pid_t pid;
163	int status;
164
165	switch (pid = fork()) {
166	case -1:				/* Error. */
167		warn("fork");
168		exit (1);
169	case 0:					/* Child. */
170		/* Go find an executable. */
171		execvP(execname, _PATH_SYSPATH, argv);
172		if (errno == ENOENT) {
173			warn("exec %s not found", execname);
174			if (execname[0] != '/') {
175				warnx("in path: %s", _PATH_SYSPATH);
176			}
177		}
178		exit(1);
179	default:				/* Parent. */
180		if (waitpid(pid, &status, 0) < 0) {
181			warn("waitpid");
182			return (1);
183		}
184
185		if (WIFEXITED(status)) {
186			if (WEXITSTATUS(status) != 0)
187				return (WEXITSTATUS(status));
188		} else if (WIFSIGNALED(status)) {
189			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
190			return (1);
191		}
192		break;
193	}
194
195	return (0);
196}
197
198static int
199specified_ro(const char *arg)
200{
201	char *optbuf, *opt;
202	int ret = 0;
203
204	optbuf = strdup(arg);
205	if (optbuf == NULL)
206		 err(1, NULL);
207
208	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
209		if (strcmp(opt, "ro") == 0) {
210			ret = 1;
211			break;
212		}
213	}
214	free(optbuf);
215	return (ret);
216}
217
218static void
219restart_mountd(void)
220{
221	struct pidfh *pfh;
222	pid_t mountdpid;
223
224	pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
225	if (pfh != NULL) {
226		/* Mountd is not running. */
227		pidfile_remove(pfh);
228		return;
229	}
230	if (errno != EEXIST) {
231		/* Cannot open pidfile for some reason. */
232		return;
233	}
234	/* We have mountd(8) PID in mountdpid varible, let's signal it. */
235	if (kill(mountdpid, SIGHUP) == -1)
236		err(1, "signal mountd");
237}
238
239int
240main(int argc, char *argv[])
241{
242	const char *mntfromname, **vfslist, *vfstype;
243	struct fstab *fs;
244	struct statfs *mntbuf;
245	int all, ch, i, init_flags, late, mntsize, rval, have_fstab, ro;
246	char *cp, *ep, *options;
247
248	all = init_flags = late = 0;
249	ro = 0;
250	options = NULL;
251	vfslist = NULL;
252	vfstype = "ufs";
253	while ((ch = getopt(argc, argv, "adF:flo:prt:uvw")) != -1)
254		switch (ch) {
255		case 'a':
256			all = 1;
257			break;
258		case 'd':
259			debug = 1;
260			break;
261		case 'F':
262			setfstab(optarg);
263			break;
264		case 'f':
265			init_flags |= MNT_FORCE;
266			break;
267		case 'l':
268			late = 1;
269			break;
270		case 'o':
271			if (*optarg) {
272				options = catopt(options, optarg);
273				if (specified_ro(optarg))
274					ro = 1;
275			}
276			break;
277		case 'p':
278			fstab_style = 1;
279			verbose = 1;
280			break;
281		case 'r':
282			options = catopt(options, "ro");
283			ro = 1;
284			break;
285		case 't':
286			if (vfslist != NULL)
287				errx(1, "only one -t option may be specified");
288			vfslist = makevfslist(optarg);
289			vfstype = optarg;
290			break;
291		case 'u':
292			init_flags |= MNT_UPDATE;
293			break;
294		case 'v':
295			verbose = 1;
296			break;
297		case 'w':
298			options = catopt(options, "noro");
299			break;
300		case '?':
301		default:
302			usage();
303			/* NOTREACHED */
304		}
305	argc -= optind;
306	argv += optind;
307
308#define	BADTYPE(type)							\
309	(strcmp(type, FSTAB_RO) &&					\
310	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
311
312	if ((init_flags & MNT_UPDATE) && (ro == 0))
313		options = catopt(options, "noro");
314
315	rval = 0;
316	switch (argc) {
317	case 0:
318		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
319			err(1, "getmntinfo");
320		if (all) {
321			while ((fs = getfsent()) != NULL) {
322				if (BADTYPE(fs->fs_type))
323					continue;
324				if (checkvfsname(fs->fs_vfstype, vfslist))
325					continue;
326				if (hasopt(fs->fs_mntops, "noauto"))
327					continue;
328				if (hasopt(fs->fs_mntops, "late") && !late)
329					continue;
330				if (!(init_flags & MNT_UPDATE) &&
331				    ismounted(fs, mntbuf, mntsize))
332					continue;
333				options = update_options(options, fs->fs_mntops,
334				    mntbuf->f_flags);
335				if (mountfs(fs->fs_vfstype, fs->fs_spec,
336				    fs->fs_file, init_flags, options,
337				    fs->fs_mntops))
338					rval = 1;
339			}
340		} else if (fstab_style) {
341			for (i = 0; i < mntsize; i++) {
342				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
343					continue;
344				putfsent(&mntbuf[i]);
345			}
346		} else {
347			for (i = 0; i < mntsize; i++) {
348				if (checkvfsname(mntbuf[i].f_fstypename,
349				    vfslist))
350					continue;
351				if (!verbose &&
352				    (mntbuf[i].f_flags & MNT_IGNORE) != 0)
353					continue;
354				prmount(&mntbuf[i]);
355			}
356		}
357		exit(rval);
358	case 1:
359		if (vfslist != NULL)
360			usage();
361
362		rmslashes(*argv, *argv);
363		if (init_flags & MNT_UPDATE) {
364			mntfromname = NULL;
365			have_fstab = 0;
366			if ((mntbuf = getmntpt(*argv)) == NULL)
367				errx(1, "not currently mounted %s", *argv);
368			/*
369			 * Only get the mntflags from fstab if both mntpoint
370			 * and mntspec are identical. Also handle the special
371			 * case where just '/' is mounted and 'spec' is not
372			 * identical with the one from fstab ('/dev' is missing
373			 * in the spec-string at boot-time).
374			 */
375			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
376				if (strcmp(fs->fs_spec,
377				    mntbuf->f_mntfromname) == 0 &&
378				    strcmp(fs->fs_file,
379				    mntbuf->f_mntonname) == 0) {
380					have_fstab = 1;
381					mntfromname = mntbuf->f_mntfromname;
382				} else if (argv[0][0] == '/' &&
383				    argv[0][1] == '\0') {
384					fs = getfsfile("/");
385					have_fstab = 1;
386					mntfromname = fs->fs_spec;
387				}
388			}
389			if (have_fstab) {
390				options = update_options(options, fs->fs_mntops,
391				    mntbuf->f_flags);
392			} else {
393				mntfromname = mntbuf->f_mntfromname;
394				options = update_options(options, NULL,
395				    mntbuf->f_flags);
396			}
397			rval = mountfs(mntbuf->f_fstypename, mntfromname,
398			    mntbuf->f_mntonname, init_flags, options, 0);
399			break;
400		}
401		if ((fs = getfsfile(*argv)) == NULL &&
402		    (fs = getfsspec(*argv)) == NULL)
403			errx(1, "%s: unknown special file or file system",
404			    *argv);
405		if (BADTYPE(fs->fs_type))
406			errx(1, "%s has unknown file system type",
407			    *argv);
408		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
409		    init_flags, options, fs->fs_mntops);
410		break;
411	case 2:
412		/*
413		 * If -t flag has not been specified, the path cannot be
414		 * found, spec contains either a ':' or a '@', then assume
415		 * that an NFS file system is being specified ala Sun.
416		 * Check if the hostname contains only allowed characters
417		 * to reduce false positives.  IPv6 addresses containing
418		 * ':' will be correctly parsed only if the separator is '@'.
419		 * The definition of a valid hostname is taken from RFC 1034.
420		 */
421		if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
422		    (ep = strchr(argv[0], ':')) != NULL)) {
423			if (*ep == '@') {
424				cp = ep + 1;
425				ep = cp + strlen(cp);
426			} else
427				cp = argv[0];
428			while (cp != ep) {
429				if (!isdigit(*cp) && !isalpha(*cp) &&
430				    *cp != '.' && *cp != '-' && *cp != ':')
431					break;
432				cp++;
433			}
434			if (cp == ep)
435				vfstype = "nfs";
436		}
437		rval = mountfs(vfstype,
438		    argv[0], argv[1], init_flags, options, NULL);
439		break;
440	default:
441		usage();
442		/* NOTREACHED */
443	}
444
445	/*
446	 * If the mount was successfully, and done by root, tell mountd the
447	 * good news.
448	 */
449	if (rval == 0 && getuid() == 0)
450		restart_mountd();
451
452	exit(rval);
453}
454
455int
456ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
457{
458	char realfsfile[PATH_MAX];
459	int i;
460
461	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
462		/* the root file system can always be remounted */
463		return (0);
464
465	/* The user may have specified a symlink in fstab, resolve the path */
466	if (realpath(fs->fs_file, realfsfile) == NULL) {
467		/* Cannot resolve the path, use original one */
468		strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
469	}
470
471	for (i = mntsize - 1; i >= 0; --i)
472		if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
473		    (!isremountable(fs->fs_vfstype) ||
474		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
475			return (1);
476	return (0);
477}
478
479int
480isremountable(const char *vfsname)
481{
482	const char **cp;
483
484	for (cp = remountable_fs_names; *cp; cp++)
485		if (strcmp(*cp, vfsname) == 0)
486			return (1);
487	return (0);
488}
489
490int
491hasopt(const char *mntopts, const char *option)
492{
493	int negative, found;
494	char *opt, *optbuf;
495
496	if (option[0] == 'n' && option[1] == 'o') {
497		negative = 1;
498		option += 2;
499	} else
500		negative = 0;
501	optbuf = strdup(mntopts);
502	found = 0;
503	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
504		if (opt[0] == 'n' && opt[1] == 'o') {
505			if (!strcasecmp(opt + 2, option))
506				found = negative;
507		} else if (!strcasecmp(opt, option))
508			found = !negative;
509	}
510	free(optbuf);
511	return (found);
512}
513
514static void
515append_arg(struct cpa *sa, char *arg)
516{
517	if (sa->c + 1 == sa->sz) {
518		sa->sz = sa->sz == 0 ? 8 : sa->sz * 2;
519		sa->a = realloc(sa->a, sizeof(sa->a) * sa->sz);
520		if (sa->a == NULL)
521			errx(1, "realloc failed");
522	}
523	sa->a[++sa->c] = arg;
524}
525
526int
527mountfs(const char *vfstype, const char *spec, const char *name, int flags,
528	const char *options, const char *mntopts)
529{
530	struct statfs sf;
531	int i, ret;
532	char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
533	static struct cpa mnt_argv;
534
535	/* resolve the mountpoint with realpath(3) */
536	(void)checkpath(name, mntpath);
537	name = mntpath;
538
539	if (mntopts == NULL)
540		mntopts = "";
541	optbuf = catopt(strdup(mntopts), options);
542
543	if (strcmp(name, "/") == 0)
544		flags |= MNT_UPDATE;
545	if (flags & MNT_FORCE)
546		optbuf = catopt(optbuf, "force");
547	if (flags & MNT_RDONLY)
548		optbuf = catopt(optbuf, "ro");
549	/*
550	 * XXX
551	 * The mount_mfs (newfs) command uses -o to select the
552	 * optimization mode.  We don't pass the default "-o rw"
553	 * for that reason.
554	 */
555	if (flags & MNT_UPDATE)
556		optbuf = catopt(optbuf, "update");
557
558	/* Compatibility glue. */
559	if (strcmp(vfstype, "msdos") == 0) {
560		warnx(
561		    "Using \"-t msdosfs\", since \"-t msdos\" is deprecated.");
562		vfstype = "msdosfs";
563	}
564
565	/* Construct the name of the appropriate mount command */
566	(void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
567
568	mnt_argv.c = -1;
569	append_arg(&mnt_argv, execname);
570	mangle(optbuf, &mnt_argv);
571	if (mountprog != NULL)
572		strcpy(execname, mountprog);
573
574	append_arg(&mnt_argv, strdup(spec));
575	append_arg(&mnt_argv, strdup(name));
576	append_arg(&mnt_argv, NULL);
577
578	if (debug) {
579		if (use_mountprog(vfstype))
580			printf("exec: %s", execname);
581		else
582			printf("mount -t %s", vfstype);
583		for (i = 1; i < mnt_argv.c; i++)
584			(void)printf(" %s", mnt_argv.a[i]);
585		(void)printf("\n");
586		return (0);
587	}
588
589	if (use_mountprog(vfstype)) {
590		ret = exec_mountprog(name, execname, mnt_argv.a);
591	} else {
592		ret = mount_fs(vfstype, mnt_argv.c, mnt_argv.a);
593	}
594
595	free(optbuf);
596
597	if (verbose) {
598		if (statfs(name, &sf) < 0) {
599			warn("statfs %s", name);
600			return (1);
601		}
602		if (fstab_style)
603			putfsent(&sf);
604		else
605			prmount(&sf);
606	}
607
608	return (ret);
609}
610
611void
612prmount(struct statfs *sfp)
613{
614	int flags;
615	unsigned int i;
616	struct opt *o;
617	struct passwd *pw;
618
619	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
620	    sfp->f_fstypename);
621
622	flags = sfp->f_flags & MNT_VISFLAGMASK;
623	for (o = optnames; flags && o->o_opt; o++)
624		if (flags & o->o_opt) {
625			(void)printf(", %s", o->o_name);
626			flags &= ~o->o_opt;
627		}
628	/*
629	 * Inform when file system is mounted by an unprivileged user
630	 * or privileged non-root user.
631	 */
632	if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
633		(void)printf(", mounted by ");
634		if ((pw = getpwuid(sfp->f_owner)) != NULL)
635			(void)printf("%s", pw->pw_name);
636		else
637			(void)printf("%d", sfp->f_owner);
638	}
639	if (verbose) {
640		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
641			(void)printf(", writes: sync %ju async %ju",
642			    (uintmax_t)sfp->f_syncwrites,
643			    (uintmax_t)sfp->f_asyncwrites);
644		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
645			(void)printf(", reads: sync %ju async %ju",
646			    (uintmax_t)sfp->f_syncreads,
647			    (uintmax_t)sfp->f_asyncreads);
648		if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
649			printf(", fsid ");
650			for (i = 0; i < sizeof(sfp->f_fsid); i++)
651				printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
652		}
653	}
654	(void)printf(")\n");
655}
656
657struct statfs *
658getmntpt(const char *name)
659{
660	struct statfs *mntbuf;
661	int i, mntsize;
662
663	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
664	for (i = mntsize - 1; i >= 0; i--) {
665		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
666		    strcmp(mntbuf[i].f_mntonname, name) == 0)
667			return (&mntbuf[i]);
668	}
669	return (NULL);
670}
671
672char *
673catopt(char *s0, const char *s1)
674{
675	size_t i;
676	char *cp;
677
678	if (s1 == NULL || *s1 == '\0')
679		return (s0);
680
681	if (s0 && *s0) {
682		i = strlen(s0) + strlen(s1) + 1 + 1;
683		if ((cp = malloc(i)) == NULL)
684			errx(1, "malloc failed");
685		(void)snprintf(cp, i, "%s,%s", s0, s1);
686	} else
687		cp = strdup(s1);
688
689	if (s0)
690		free(s0);
691	return (cp);
692}
693
694void
695mangle(char *options, struct cpa *a)
696{
697	char *p, *s, *val;
698
699	for (s = options; (p = strsep(&s, ",")) != NULL;)
700		if (*p != '\0') {
701			if (strcmp(p, "noauto") == 0) {
702				/*
703				 * Do not pass noauto option to nmount().
704				 * or external mount program.  noauto is
705				 * only used to prevent mounting a filesystem
706				 * when 'mount -a' is specified, and is
707				 * not a real mount option.
708				 */
709				continue;
710			} else if (strcmp(p, "late") == 0) {
711				/*
712				 * "late" is used to prevent certain file
713				 * systems from being mounted before late
714				 * in the boot cycle; for instance,
715				 * loopback NFS mounts can't be mounted
716				 * before mountd starts.
717				 */
718				continue;
719			} else if (strncmp(p, "mountprog", 9) == 0) {
720				/*
721				 * "mountprog" is used to force the use of
722				 * userland mount programs.
723				 */
724				val = strchr(p, '=');
725                        	if (val != NULL) {
726                                	++val;
727					if (*val != '\0')
728						mountprog = strdup(val);
729				}
730
731				if (mountprog == NULL) {
732					errx(1, "Need value for -o mountprog");
733				}
734				continue;
735			} else if (strcmp(p, "userquota") == 0) {
736				continue;
737			} else if (strncmp(p, userquotaeq,
738			    sizeof(userquotaeq) - 1) == 0) {
739				continue;
740			} else if (strcmp(p, "groupquota") == 0) {
741				continue;
742			} else if (strncmp(p, groupquotaeq,
743			    sizeof(groupquotaeq) - 1) == 0) {
744				continue;
745			} else if (*p == '-') {
746				append_arg(a, p);
747				p = strchr(p, '=');
748				if (p != NULL) {
749					*p = '\0';
750					append_arg(a, p + 1);
751				}
752			} else {
753				append_arg(a, strdup("-o"));
754				append_arg(a, p);
755			}
756		}
757}
758
759
760char *
761update_options(char *opts, char *fstab, int curflags)
762{
763	char *o, *p;
764	char *cur;
765	char *expopt, *newopt, *tmpopt;
766
767	if (opts == NULL)
768		return (strdup(""));
769
770	/* remove meta options from list */
771	remopt(fstab, MOUNT_META_OPTION_FSTAB);
772	remopt(fstab, MOUNT_META_OPTION_CURRENT);
773	cur = flags2opts(curflags);
774
775	/*
776	 * Expand all meta-options passed to us first.
777	 */
778	expopt = NULL;
779	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
780		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
781			expopt = catopt(expopt, fstab);
782		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
783			expopt = catopt(expopt, cur);
784		else
785			expopt = catopt(expopt, o);
786	}
787	free(cur);
788	free(opts);
789
790	/*
791	 * Remove previous contradictory arguments. Given option "foo" we
792	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
793	 * and "foo" - so we can deal with possible options like "notice".
794	 */
795	newopt = NULL;
796	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
797		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
798			errx(1, "malloc failed");
799
800		strcpy(tmpopt, "no");
801		strcat(tmpopt, o);
802		remopt(newopt, tmpopt);
803		free(tmpopt);
804
805		if (strncmp("no", o, 2) == 0)
806			remopt(newopt, o+2);
807
808		newopt = catopt(newopt, o);
809	}
810	free(expopt);
811
812	return (newopt);
813}
814
815void
816remopt(char *string, const char *opt)
817{
818	char *o, *p, *r;
819
820	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
821		return;
822
823	r = string;
824
825	for (p = string; (o = strsep(&p, ",")) != NULL;) {
826		if (strcmp(opt, o) != 0) {
827			if (*r == ',' && *o != '\0')
828				r++;
829			while ((*r++ = *o++) != '\0')
830			    ;
831			*--r = ',';
832		}
833	}
834	*r = '\0';
835}
836
837void
838usage(void)
839{
840
841	(void)fprintf(stderr, "%s\n%s\n%s\n",
842"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
843"       mount [-dfpruvw] special | node",
844"       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
845	exit(1);
846}
847
848void
849putfsent(struct statfs *ent)
850{
851	struct fstab *fst;
852	char *opts;
853	int l;
854
855	opts = flags2opts(ent->f_flags);
856
857	if (strncmp(ent->f_mntfromname, "<below>", 7) == 0 ||
858	    strncmp(ent->f_mntfromname, "<above>", 7) == 0) {
859		strcpy(ent->f_mntfromname, (strnstr(ent->f_mntfromname, ":", 8)
860		    +1));
861	}
862
863	/*
864	 * "rw" is not a real mount option; this is why we print NULL as "rw"
865	 * if opts is still NULL here.
866	 */
867	l = strlen(ent->f_mntfromname);
868	printf("%s%s%s%s", ent->f_mntfromname,
869	    l < 8 ? "\t" : "",
870	    l < 16 ? "\t" : "",
871	    l < 24 ? "\t" : " ");
872	l = strlen(ent->f_mntonname);
873	printf("%s%s%s%s", ent->f_mntonname,
874	    l < 8 ? "\t" : "",
875	    l < 16 ? "\t" : "",
876	    l < 24 ? "\t" : " ");
877	printf("%s\t", ent->f_fstypename);
878	if (opts == NULL) {
879		printf("%s\t", "rw");
880	} else {
881		l = strlen(opts);
882		printf("%s%s", opts,
883		    l < 8 ? "\t" : " ");
884	}
885	free(opts);
886
887	if ((fst = getfsspec(ent->f_mntfromname)))
888		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
889	else if ((fst = getfsfile(ent->f_mntonname)))
890		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
891	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
892		if (strcmp(ent->f_mntonname, "/") == 0)
893			printf("\t1 1\n");
894		else
895			printf("\t2 2\n");
896	} else
897		printf("\t0 0\n");
898}
899
900
901char *
902flags2opts(int flags)
903{
904	char *res;
905
906	res = NULL;
907
908	if (flags & MNT_RDONLY)		res = catopt(res, "ro");
909	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
910	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
911	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
912	if (flags & MNT_UNION)		res = catopt(res, "union");
913	if (flags & MNT_ASYNC)		res = catopt(res, "async");
914	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
915	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
916	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
917	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
918	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
919	if (flags & MNT_MULTILABEL)	res = catopt(res, "multilabel");
920	if (flags & MNT_ACLS)		res = catopt(res, "acls");
921
922	return (res);
923}
924