mount.c revision 164266 
1/*-
2 * Copyright (c) 1980, 1989, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1980, 1989, 1993, 1994\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)mount.c	8.25 (Berkeley) 5/8/95";
39#endif
40static const char rcsid[] =
41  "$FreeBSD: head/sbin/mount/mount.c 164266 2006-11-14 01:07:42Z rodrigc $";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/mount.h>
46#include <sys/stat.h>
47#include <sys/wait.h>
48
49#include <ctype.h>
50#include <err.h>
51#include <errno.h>
52#include <fstab.h>
53#include <paths.h>
54#include <pwd.h>
55#include <signal.h>
56#include <stdint.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62#include "extern.h"
63#include "mntopts.h"
64#include "pathnames.h"
65
66/* `meta' options */
67#define MOUNT_META_OPTION_FSTAB		"fstab"
68#define MOUNT_META_OPTION_CURRENT	"current"
69
70int debug, fstab_style, verbose;
71
72char   *catopt(char *, const char *);
73struct statfs *getmntpt(const char *);
74int	hasopt(const char *, const char *);
75int	ismounted(struct fstab *, struct statfs *, int);
76int	isremountable(const char *);
77void	mangle(char *, int *, char *[]);
78char   *update_options(char *, char *, int);
79int	mountfs(const char *, const char *, const char *,
80			int, const char *, const char *);
81void	remopt(char *, const char *);
82void	prmount(struct statfs *);
83void	putfsent(const struct statfs *);
84void	usage(void);
85char   *flags2opts(int);
86
87/* Map from mount options to printable formats. */
88static struct opt {
89	int o_opt;
90	const char *o_name;
91} optnames[] = {
92	{ MNT_ASYNC,		"asynchronous" },
93	{ MNT_EXPORTED,		"NFS exported" },
94	{ MNT_LOCAL,		"local" },
95	{ MNT_NOATIME,		"noatime" },
96	{ MNT_NOEXEC,		"noexec" },
97	{ MNT_NOSUID,		"nosuid" },
98	{ MNT_NOSYMFOLLOW,	"nosymfollow" },
99	{ MNT_QUOTA,		"with quotas" },
100	{ MNT_RDONLY,		"read-only" },
101	{ MNT_SYNCHRONOUS,	"synchronous" },
102	{ MNT_UNION,		"union" },
103	{ MNT_NOCLUSTERR,	"noclusterr" },
104	{ MNT_NOCLUSTERW,	"noclusterw" },
105	{ MNT_SUIDDIR,		"suiddir" },
106	{ MNT_SOFTDEP,		"soft-updates" },
107	{ MNT_MULTILABEL,	"multilabel" },
108	{ MNT_ACLS,		"acls" },
109	{ MNT_GJOURNAL,		"gjournal" },
110	{ 0, NULL }
111};
112
113/*
114 * List of VFS types that can be remounted without becoming mounted on top
115 * of each other.
116 * XXX Is this list correct?
117 */
118static const char *
119remountable_fs_names[] = {
120	"ufs", "ffs", "ext2fs",
121	0
122};
123
124static const char userquotaeq[] = "userquota=";
125static const char groupquotaeq[] = "groupquota=";
126
127static int
128use_mountprog(const char *vfstype)
129{
130	/* XXX: We need to get away from implementing external mount
131	 *      programs for every filesystem, and move towards having
132	 *	each filesystem properly implement the nmount() system call.
133	 */
134	unsigned int i;
135	const char *fs[] = {
136	"cd9660", "mfs", "msdosfs", "nfs", "nfs4", "ntfs",
137	"nwfs", "nullfs", "portalfs", "smbfs", "udf", "umapfs",
138	"unionfs",
139	NULL
140	};
141
142	for (i = 0; fs[i] != NULL; ++i) {
143		if (strcmp(vfstype, fs[i]) == 0)
144			return (1);
145	}
146
147	return (0);
148}
149
150static int
151exec_mountprog(const char *name, const char *execname, char *const argv[])
152{
153	pid_t pid;
154	int status;
155
156	switch (pid = fork()) {
157	case -1:				/* Error. */
158		warn("fork");
159		exit (1);
160	case 0:					/* Child. */
161		/* Go find an executable. */
162		execvP(execname, _PATH_SYSPATH, argv);
163		if (errno == ENOENT) {
164			warn("exec %s not found in %s", execname,
165			    _PATH_SYSPATH);
166		}
167		exit(1);
168	default:				/* Parent. */
169		if (waitpid(pid, &status, 0) < 0) {
170			warn("waitpid");
171			return (1);
172		}
173
174		if (WIFEXITED(status)) {
175			if (WEXITSTATUS(status) != 0)
176				return (WEXITSTATUS(status));
177		} else if (WIFSIGNALED(status)) {
178			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
179			return (1);
180		}
181		break;
182	}
183
184	return (0);
185}
186
187static int
188specified_ro(const char *arg)
189{
190	char *optbuf, *opt;
191	int ret = 0;
192
193	optbuf = strdup(arg);
194	if (optbuf == NULL)
195		 err(1, NULL);
196
197	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
198		if (strcmp(opt, "ro") == 0) {
199			ret = 1;
200			break;
201		}
202	}
203	free(optbuf);
204	return (ret);
205}
206
207int
208main(int argc, char *argv[])
209{
210	const char *mntfromname, **vfslist, *vfstype;
211	struct fstab *fs;
212	struct statfs *mntbuf;
213	FILE *mountdfp;
214	pid_t pid;
215	int all, ch, i, init_flags, late, mntsize, rval, have_fstab, ro;
216	char *cp, *ep, *options;
217
218	all = init_flags = late = 0;
219	ro = 0;
220	options = NULL;
221	vfslist = NULL;
222	vfstype = "ufs";
223	while ((ch = getopt(argc, argv, "adF:flo:prt:uvw")) != -1)
224		switch (ch) {
225		case 'a':
226			all = 1;
227			break;
228		case 'd':
229			debug = 1;
230			break;
231		case 'F':
232			setfstab(optarg);
233			break;
234		case 'f':
235			init_flags |= MNT_FORCE;
236			break;
237		case 'l':
238			late = 1;
239			break;
240		case 'o':
241			if (*optarg) {
242				options = catopt(options, optarg);
243				if (specified_ro(optarg))
244					ro = 1;
245			}
246			break;
247		case 'p':
248			fstab_style = 1;
249			verbose = 1;
250			break;
251		case 'r':
252			options = catopt(options, "ro");
253			ro = 1;
254			break;
255		case 't':
256			if (vfslist != NULL)
257				errx(1, "only one -t option may be specified");
258			vfslist = makevfslist(optarg);
259			vfstype = optarg;
260			break;
261		case 'u':
262			init_flags |= MNT_UPDATE;
263			break;
264		case 'v':
265			verbose = 1;
266			break;
267		case 'w':
268			options = catopt(options, "noro");
269			break;
270		case '?':
271		default:
272			usage();
273			/* NOTREACHED */
274		}
275	argc -= optind;
276	argv += optind;
277
278#define	BADTYPE(type)							\
279	(strcmp(type, FSTAB_RO) &&					\
280	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
281
282	if ((init_flags & MNT_UPDATE) && (ro == 0))
283		options = catopt(options, "noro");
284
285	rval = 0;
286	switch (argc) {
287	case 0:
288		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
289			err(1, "getmntinfo");
290		if (all) {
291			while ((fs = getfsent()) != NULL) {
292				if (BADTYPE(fs->fs_type))
293					continue;
294				if (checkvfsname(fs->fs_vfstype, vfslist))
295					continue;
296				if (hasopt(fs->fs_mntops, "noauto"))
297					continue;
298				if (hasopt(fs->fs_mntops, "late") && !late)
299					continue;
300				if (!(init_flags & MNT_UPDATE) &&
301				    ismounted(fs, mntbuf, mntsize))
302					continue;
303				options = update_options(options, fs->fs_mntops,
304				    mntbuf->f_flags);
305				if (mountfs(fs->fs_vfstype, fs->fs_spec,
306				    fs->fs_file, init_flags, options,
307				    fs->fs_mntops))
308					rval = 1;
309			}
310		} else if (fstab_style) {
311			for (i = 0; i < mntsize; i++) {
312				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
313					continue;
314				putfsent(&mntbuf[i]);
315			}
316		} else {
317			for (i = 0; i < mntsize; i++) {
318				if (checkvfsname(mntbuf[i].f_fstypename,
319				    vfslist))
320					continue;
321				prmount(&mntbuf[i]);
322			}
323		}
324		exit(rval);
325	case 1:
326		if (vfslist != NULL)
327			usage();
328
329		rmslashes(*argv, *argv);
330		if (init_flags & MNT_UPDATE) {
331			mntfromname = NULL;
332			have_fstab = 0;
333			if ((mntbuf = getmntpt(*argv)) == NULL)
334				errx(1, "not currently mounted %s", *argv);
335			/*
336			 * Only get the mntflags from fstab if both mntpoint
337			 * and mntspec are identical. Also handle the special
338			 * case where just '/' is mounted and 'spec' is not
339			 * identical with the one from fstab ('/dev' is missing
340			 * in the spec-string at boot-time).
341			 */
342			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
343				if (strcmp(fs->fs_spec,
344				    mntbuf->f_mntfromname) == 0 &&
345				    strcmp(fs->fs_file,
346				    mntbuf->f_mntonname) == 0) {
347					have_fstab = 1;
348					mntfromname = mntbuf->f_mntfromname;
349				} else if (argv[0][0] == '/' &&
350				    argv[0][1] == '\0') {
351					fs = getfsfile("/");
352					have_fstab = 1;
353					mntfromname = fs->fs_spec;
354				}
355			}
356			if (have_fstab) {
357				options = update_options(options, fs->fs_mntops,
358				    mntbuf->f_flags);
359			} else {
360				mntfromname = mntbuf->f_mntfromname;
361				options = update_options(options, NULL,
362				    mntbuf->f_flags);
363			}
364			rval = mountfs(mntbuf->f_fstypename, mntfromname,
365			    mntbuf->f_mntonname, init_flags, options, 0);
366			break;
367		}
368		if ((fs = getfsfile(*argv)) == NULL &&
369		    (fs = getfsspec(*argv)) == NULL)
370			errx(1, "%s: unknown special file or file system",
371			    *argv);
372		if (BADTYPE(fs->fs_type))
373			errx(1, "%s has unknown file system type",
374			    *argv);
375		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
376		    init_flags, options, fs->fs_mntops);
377		break;
378	case 2:
379		/*
380		 * If -t flag has not been specified, the path cannot be
381		 * found, spec contains either a ':' or a '@', then assume
382		 * that an NFS file system is being specified ala Sun.
383		 * Check if the hostname contains only allowed characters
384		 * to reduce false positives.  IPv6 addresses containing
385		 * ':' will be correctly parsed only if the separator is '@'.
386		 * The definition of a valid hostname is taken from RFC 1034.
387		 */
388		if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
389		    (ep = strchr(argv[0], ':')) != NULL)) {
390			if (*ep == '@') {
391				cp = ep + 1;
392				ep = cp + strlen(cp);
393			} else
394				cp = argv[0];
395			while (cp != ep) {
396				if (!isdigit(*cp) && !isalpha(*cp) &&
397				    *cp != '.' && *cp != '-' && *cp != ':')
398					break;
399				cp++;
400			}
401			if (cp == ep)
402				vfstype = "nfs";
403		}
404		rval = mountfs(vfstype,
405		    argv[0], argv[1], init_flags, options, NULL);
406		break;
407	default:
408		usage();
409		/* NOTREACHED */
410	}
411
412	/*
413	 * If the mount was successfully, and done by root, tell mountd the
414	 * good news.  Pid checks are probably unnecessary, but don't hurt.
415	 */
416	if (rval == 0 && getuid() == 0 &&
417	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
418		if (fscanf(mountdfp, "%d", &pid) == 1 &&
419		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
420			err(1, "signal mountd");
421		(void)fclose(mountdfp);
422	}
423
424	exit(rval);
425}
426
427int
428ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
429{
430	char realfsfile[PATH_MAX];
431	int i;
432
433	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
434		/* the root file system can always be remounted */
435		return (0);
436
437	/* The user may have specified a symlink in fstab, resolve the path */
438	if (realpath(fs->fs_file, realfsfile) == NULL) {
439		/* Cannot resolve the path, use original one */
440		strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
441	}
442
443	for (i = mntsize - 1; i >= 0; --i)
444		if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
445		    (!isremountable(fs->fs_vfstype) ||
446		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
447			return (1);
448	return (0);
449}
450
451int
452isremountable(const char *vfsname)
453{
454	const char **cp;
455
456	for (cp = remountable_fs_names; *cp; cp++)
457		if (strcmp(*cp, vfsname) == 0)
458			return (1);
459	return (0);
460}
461
462int
463hasopt(const char *mntopts, const char *option)
464{
465	int negative, found;
466	char *opt, *optbuf;
467
468	if (option[0] == 'n' && option[1] == 'o') {
469		negative = 1;
470		option += 2;
471	} else
472		negative = 0;
473	optbuf = strdup(mntopts);
474	found = 0;
475	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
476		if (opt[0] == 'n' && opt[1] == 'o') {
477			if (!strcasecmp(opt + 2, option))
478				found = negative;
479		} else if (!strcasecmp(opt, option))
480			found = !negative;
481	}
482	free(optbuf);
483	return (found);
484}
485
486int
487mountfs(const char *vfstype, const char *spec, const char *name, int flags,
488	const char *options, const char *mntopts)
489{
490	char *argv[100];
491	struct statfs sf;
492	int argc, i, ret;
493	char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
494
495	/* resolve the mountpoint with realpath(3) */
496	(void)checkpath(name, mntpath);
497	name = mntpath;
498
499	if (mntopts == NULL)
500		mntopts = "";
501	optbuf = catopt(strdup(mntopts), options);
502
503	if (strcmp(name, "/") == 0)
504		flags |= MNT_UPDATE;
505	if (flags & MNT_FORCE)
506		optbuf = catopt(optbuf, "force");
507	if (flags & MNT_RDONLY)
508		optbuf = catopt(optbuf, "ro");
509	/*
510	 * XXX
511	 * The mount_mfs (newfs) command uses -o to select the
512	 * optimization mode.  We don't pass the default "-o rw"
513	 * for that reason.
514	 */
515	if (flags & MNT_UPDATE)
516		optbuf = catopt(optbuf, "update");
517
518	/* Compatibility glue. */
519	if (strcmp(vfstype, "msdos") == 0)
520		vfstype = "msdosfs";
521
522	/* Construct the name of the appropriate mount command */
523	(void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
524
525	argc = 0;
526	argv[argc++] = execname;
527	mangle(optbuf, &argc, argv);
528	argv[argc++] = strdup(spec);
529	argv[argc++] = strdup(name);
530	argv[argc] = NULL;
531
532	if (debug) {
533		if (use_mountprog(vfstype))
534			printf("exec: mount_%s", vfstype);
535		else
536			printf("mount -t %s", vfstype);
537		for (i = 1; i < argc; i++)
538			(void)printf(" %s", argv[i]);
539		(void)printf("\n");
540		return (0);
541	}
542
543	if (use_mountprog(vfstype)) {
544		ret = exec_mountprog(name, execname, argv);
545	} else {
546		ret = mount_fs(vfstype, argc, argv);
547	}
548
549	free(optbuf);
550
551	if (verbose) {
552		if (statfs(name, &sf) < 0) {
553			warn("statfs %s", name);
554			return (1);
555		}
556		if (fstab_style)
557			putfsent(&sf);
558		else
559			prmount(&sf);
560	}
561
562	return (0);
563}
564
565void
566prmount(struct statfs *sfp)
567{
568	int flags;
569	unsigned int i;
570	struct opt *o;
571	struct passwd *pw;
572
573	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
574	    sfp->f_fstypename);
575
576	flags = sfp->f_flags & MNT_VISFLAGMASK;
577	for (o = optnames; flags && o->o_opt; o++)
578		if (flags & o->o_opt) {
579			(void)printf(", %s", o->o_name);
580			flags &= ~o->o_opt;
581		}
582	/*
583	 * Inform when file system is mounted by an unprivileged user
584	 * or privileged non-root user.
585	 */
586	if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
587		(void)printf(", mounted by ");
588		if ((pw = getpwuid(sfp->f_owner)) != NULL)
589			(void)printf("%s", pw->pw_name);
590		else
591			(void)printf("%d", sfp->f_owner);
592	}
593	if (verbose) {
594		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
595			(void)printf(", writes: sync %ju async %ju",
596			    (uintmax_t)sfp->f_syncwrites,
597			    (uintmax_t)sfp->f_asyncwrites);
598		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
599			(void)printf(", reads: sync %ju async %ju",
600			    (uintmax_t)sfp->f_syncreads,
601			    (uintmax_t)sfp->f_asyncreads);
602		if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
603			printf(", fsid ");
604			for (i = 0; i < sizeof(sfp->f_fsid); i++)
605				printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
606		}
607	}
608	(void)printf(")\n");
609}
610
611struct statfs *
612getmntpt(const char *name)
613{
614	struct statfs *mntbuf;
615	int i, mntsize;
616
617	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
618	for (i = mntsize - 1; i >= 0; i--) {
619		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
620		    strcmp(mntbuf[i].f_mntonname, name) == 0)
621			return (&mntbuf[i]);
622	}
623	return (NULL);
624}
625
626char *
627catopt(char *s0, const char *s1)
628{
629	size_t i;
630	char *cp;
631
632	if (s1 == NULL || *s1 == '\0')
633		return (s0);
634
635	if (s0 && *s0) {
636		i = strlen(s0) + strlen(s1) + 1 + 1;
637		if ((cp = malloc(i)) == NULL)
638			errx(1, "malloc failed");
639		(void)snprintf(cp, i, "%s,%s", s0, s1);
640	} else
641		cp = strdup(s1);
642
643	if (s0)
644		free(s0);
645	return (cp);
646}
647
648void
649mangle(char *options, int *argcp, char *argv[])
650{
651	char *p, *s;
652	int argc;
653
654	argc = *argcp;
655	for (s = options; (p = strsep(&s, ",")) != NULL;)
656		if (*p != '\0') {
657			if (strcmp(p, "noauto") == 0) {
658				/*
659				 * Do not pass noauto option to nmount().
660				 * or external mount program.  noauto is
661				 * only used to prevent mounting a filesystem
662				 * when 'mount -a' is specified, and is
663				 * not a real mount option.
664				 */
665				continue;
666			} else if (strcmp(p, "late") == 0) {
667				/*
668				 * "late" is used to prevent certain file
669				 * systems from being mounted before late
670				 * in the boot cycle; for instance,
671				 * loopback NFS mounts can't be mounted
672				 * before mountd starts.
673				 */
674				continue;
675			} else if (strcmp(p, "userquota") == 0) {
676				continue;
677			} else if (strncmp(p, userquotaeq,
678			    sizeof(userquotaeq) - 1) == 0) {
679				continue;
680			} else if (strcmp(p, "groupquota") == 0) {
681				continue;
682			} else if (strncmp(p, groupquotaeq,
683			    sizeof(groupquotaeq) - 1) == 0) {
684				continue;
685			} else if (*p == '-') {
686				argv[argc++] = p;
687				p = strchr(p, '=');
688				if (p != NULL) {
689					*p = '\0';
690					argv[argc++] = p+1;
691				}
692			} else {
693				argv[argc++] = strdup("-o");
694				argv[argc++] = p;
695			}
696		}
697
698	*argcp = argc;
699}
700
701
702char *
703update_options(char *opts, char *fstab, int curflags)
704{
705	char *o, *p;
706	char *cur;
707	char *expopt, *newopt, *tmpopt;
708
709	if (opts == NULL)
710		return (strdup(""));
711
712	/* remove meta options from list */
713	remopt(fstab, MOUNT_META_OPTION_FSTAB);
714	remopt(fstab, MOUNT_META_OPTION_CURRENT);
715	cur = flags2opts(curflags);
716
717	/*
718	 * Expand all meta-options passed to us first.
719	 */
720	expopt = NULL;
721	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
722		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
723			expopt = catopt(expopt, fstab);
724		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
725			expopt = catopt(expopt, cur);
726		else
727			expopt = catopt(expopt, o);
728	}
729	free(cur);
730	free(opts);
731
732	/*
733	 * Remove previous contradictory arguments. Given option "foo" we
734	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
735	 * and "foo" - so we can deal with possible options like "notice".
736	 */
737	newopt = NULL;
738	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
739		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
740			errx(1, "malloc failed");
741
742		strcpy(tmpopt, "no");
743		strcat(tmpopt, o);
744		remopt(newopt, tmpopt);
745		free(tmpopt);
746
747		if (strncmp("no", o, 2) == 0)
748			remopt(newopt, o+2);
749
750		newopt = catopt(newopt, o);
751	}
752	free(expopt);
753
754	return (newopt);
755}
756
757void
758remopt(char *string, const char *opt)
759{
760	char *o, *p, *r;
761
762	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
763		return;
764
765	r = string;
766
767	for (p = string; (o = strsep(&p, ",")) != NULL;) {
768		if (strcmp(opt, o) != 0) {
769			if (*r == ',' && *o != '\0')
770				r++;
771			while ((*r++ = *o++) != '\0')
772			    ;
773			*--r = ',';
774		}
775	}
776	*r = '\0';
777}
778
779void
780usage(void)
781{
782
783	(void)fprintf(stderr, "%s\n%s\n%s\n",
784"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
785"       mount [-dfpruvw] special | node",
786"       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
787	exit(1);
788}
789
790void
791putfsent(const struct statfs *ent)
792{
793	struct fstab *fst;
794	char *opts;
795
796	opts = flags2opts(ent->f_flags);
797
798	/*
799	 * "rw" is not a real mount option; this is why we print NULL as "rw"
800	 * if opts is still NULL here.
801	 */
802	printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
803	    ent->f_fstypename, opts ? opts : "rw");
804	free(opts);
805
806	if ((fst = getfsspec(ent->f_mntfromname)))
807		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
808	else if ((fst = getfsfile(ent->f_mntonname)))
809		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
810	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
811		if (strcmp(ent->f_mntonname, "/") == 0)
812			printf("\t1 1\n");
813		else
814			printf("\t2 2\n");
815	} else
816		printf("\t0 0\n");
817}
818
819
820char *
821flags2opts(int flags)
822{
823	char *res;
824
825	res = NULL;
826
827	if (flags & MNT_RDONLY)		res = catopt(res, "ro");
828	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
829	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
830	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
831	if (flags & MNT_UNION)		res = catopt(res, "union");
832	if (flags & MNT_ASYNC)		res = catopt(res, "async");
833	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
834	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
835	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
836	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
837	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
838	if (flags & MNT_MULTILABEL)	res = catopt(res, "multilabel");
839	if (flags & MNT_ACLS)		res = catopt(res, "acls");
840	if (flags & MNT_GJOURNAL)	res = catopt(res, "gjournal");
841
842	return (res);
843}
844