mount.c revision 160303 
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 160303 2006-07-12 16:05:51Z des $";
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	{ 0, NULL }
110};
111
112/*
113 * List of VFS types that can be remounted without becoming mounted on top
114 * of each other.
115 * XXX Is this list correct?
116 */
117static const char *
118remountable_fs_names[] = {
119	"ufs", "ffs", "ext2fs",
120	0
121};
122
123static const char userquotaeq[] = "userquota=";
124static const char groupquotaeq[] = "groupquota=";
125
126static int
127use_mountprog(const char *vfstype)
128{
129	/* XXX: We need to get away from implementing external mount
130	 *      programs for every filesystem, and move towards having
131	 *	each filesystem properly implement the nmount() system call.
132	 */
133	unsigned int i;
134	const char *fs[] = {
135	"cd9660", "mfs", "msdosfs", "nfs", "nfs4", "ntfs",
136	"nwfs", "nullfs", "portalfs", "smbfs", "udf", "umapfs",
137	"unionfs",
138	NULL
139	};
140
141	for (i = 0; fs[i] != NULL; ++i) {
142		if (strcmp(vfstype, fs[i]) == 0)
143			return (1);
144	}
145
146	return (0);
147}
148
149static int
150exec_mountprog(const char *name, const char *execname, char *const argv[])
151{
152	pid_t pid;
153	int status;
154
155	switch (pid = fork()) {
156	case -1:				/* Error. */
157		warn("fork");
158		exit (1);
159	case 0:					/* Child. */
160		/* Go find an executable. */
161		execvP(execname, _PATH_SYSPATH, argv);
162		if (errno == ENOENT) {
163			warn("exec %s not found in %s", execname,
164			    _PATH_SYSPATH);
165		}
166		exit(1);
167	default:				/* Parent. */
168		if (waitpid(pid, &status, 0) < 0) {
169			warn("waitpid");
170			return (1);
171		}
172
173		if (WIFEXITED(status)) {
174			if (WEXITSTATUS(status) != 0)
175				return (WEXITSTATUS(status));
176		} else if (WIFSIGNALED(status)) {
177			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
178			return (1);
179		}
180		break;
181	}
182
183	return (0);
184}
185
186int
187main(int argc, char *argv[])
188{
189	const char *mntfromname, **vfslist, *vfstype;
190	struct fstab *fs;
191	struct statfs *mntbuf;
192	FILE *mountdfp;
193	pid_t pid;
194	int all, ch, i, init_flags, late, mntsize, rval, have_fstab;
195	char *cp, *ep, *options;
196
197	options = strdup("noro");
198	if (options == NULL)
199		errx(1, "malloc failed");
200
201	all = init_flags = late = 0;
202	vfslist = NULL;
203	vfstype = "ufs";
204	while ((ch = getopt(argc, argv, "adlF:fo:prwt:uv")) != -1)
205		switch (ch) {
206		case 'a':
207			all = 1;
208			break;
209		case 'd':
210			debug = 1;
211			break;
212		case 'F':
213			setfstab(optarg);
214			break;
215		case 'f':
216			init_flags |= MNT_FORCE;
217			break;
218		case 'l':
219			late = 1;
220			break;
221		case 'o':
222			options = catopt(options, optarg);
223			break;
224		case 'p':
225			fstab_style = 1;
226			verbose = 1;
227			break;
228		case 'r':
229			options = catopt(options, "ro");
230			break;
231		case 't':
232			if (vfslist != NULL)
233				errx(1, "only one -t option may be specified");
234			vfslist = makevfslist(optarg);
235			vfstype = optarg;
236			break;
237		case 'u':
238			init_flags |= MNT_UPDATE;
239			break;
240		case 'v':
241			verbose = 1;
242			break;
243		case 'w':
244			options = catopt(options, "noro");
245			break;
246		case '?':
247		default:
248			usage();
249			/* NOTREACHED */
250		}
251	argc -= optind;
252	argv += optind;
253
254#define	BADTYPE(type)							\
255	(strcmp(type, FSTAB_RO) &&					\
256	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
257
258	rval = 0;
259	switch (argc) {
260	case 0:
261		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
262			err(1, "getmntinfo");
263		if (all) {
264			while ((fs = getfsent()) != NULL) {
265				if (BADTYPE(fs->fs_type))
266					continue;
267				if (checkvfsname(fs->fs_vfstype, vfslist))
268					continue;
269				if (hasopt(fs->fs_mntops, "noauto"))
270					continue;
271				if (hasopt(fs->fs_mntops, "late") && !late)
272					continue;
273				if (!(init_flags & MNT_UPDATE) &&
274				    ismounted(fs, mntbuf, mntsize))
275					continue;
276				options = update_options(options, fs->fs_mntops,
277				    mntbuf->f_flags);
278				if (mountfs(fs->fs_vfstype, fs->fs_spec,
279				    fs->fs_file, init_flags, options,
280				    fs->fs_mntops))
281					rval = 1;
282			}
283		} else if (fstab_style) {
284			for (i = 0; i < mntsize; i++) {
285				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
286					continue;
287				putfsent(&mntbuf[i]);
288			}
289		} else {
290			for (i = 0; i < mntsize; i++) {
291				if (checkvfsname(mntbuf[i].f_fstypename,
292				    vfslist))
293					continue;
294				prmount(&mntbuf[i]);
295			}
296		}
297		exit(rval);
298	case 1:
299		if (vfslist != NULL)
300			usage();
301
302		rmslashes(*argv, *argv);
303		if (init_flags & MNT_UPDATE) {
304			mntfromname = NULL;
305			have_fstab = 0;
306			if ((mntbuf = getmntpt(*argv)) == NULL)
307				errx(1, "not currently mounted %s", *argv);
308			/*
309			 * Only get the mntflags from fstab if both mntpoint
310			 * and mntspec are identical. Also handle the special
311			 * case where just '/' is mounted and 'spec' is not
312			 * identical with the one from fstab ('/dev' is missing
313			 * in the spec-string at boot-time).
314			 */
315			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
316				if (strcmp(fs->fs_spec,
317				    mntbuf->f_mntfromname) == 0 &&
318				    strcmp(fs->fs_file,
319				    mntbuf->f_mntonname) == 0) {
320					have_fstab = 1;
321					mntfromname = mntbuf->f_mntfromname;
322				} else if (argv[0][0] == '/' &&
323				    argv[0][1] == '\0') {
324					fs = getfsfile("/");
325					have_fstab = 1;
326					mntfromname = fs->fs_spec;
327				}
328			}
329			if (have_fstab) {
330				options = update_options(options, fs->fs_mntops,
331				    mntbuf->f_flags);
332			} else {
333				mntfromname = mntbuf->f_mntfromname;
334				options = update_options(options, NULL,
335				    mntbuf->f_flags);
336			}
337			rval = mountfs(mntbuf->f_fstypename, mntfromname,
338			    mntbuf->f_mntonname, init_flags, options, 0);
339			break;
340		}
341		if ((fs = getfsfile(*argv)) == NULL &&
342		    (fs = getfsspec(*argv)) == NULL)
343			errx(1, "%s: unknown special file or file system",
344			    *argv);
345		if (BADTYPE(fs->fs_type))
346			errx(1, "%s has unknown file system type",
347			    *argv);
348		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
349		    init_flags, options, fs->fs_mntops);
350		break;
351	case 2:
352		/*
353		 * If -t flag has not been specified, the path cannot be
354		 * found, spec contains either a ':' or a '@', then assume
355		 * that an NFS file system is being specified ala Sun.
356		 * Check if the hostname contains only allowed characters
357		 * to reduce false positives.  IPv6 addresses containing
358		 * ':' will be correctly parsed only if the separator is '@'.
359		 * The definition of a valid hostname is taken from RFC 1034.
360		 */
361		if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
362		    (ep = strchr(argv[0], ':')) != NULL)) {
363			if (*ep == '@') {
364				cp = ep + 1;
365				ep = cp + strlen(cp);
366			} else
367				cp = argv[0];
368			while (cp != ep) {
369				if (!isdigit(*cp) && !isalpha(*cp) &&
370				    *cp != '.' && *cp != '-' && *cp != ':')
371					break;
372				cp++;
373			}
374			if (cp == ep)
375				vfstype = "nfs";
376		}
377		rval = mountfs(vfstype,
378		    argv[0], argv[1], init_flags, options, NULL);
379		break;
380	default:
381		usage();
382		/* NOTREACHED */
383	}
384
385	/*
386	 * If the mount was successfully, and done by root, tell mountd the
387	 * good news.  Pid checks are probably unnecessary, but don't hurt.
388	 */
389	if (rval == 0 && getuid() == 0 &&
390	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
391		if (fscanf(mountdfp, "%d", &pid) == 1 &&
392		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
393			err(1, "signal mountd");
394		(void)fclose(mountdfp);
395	}
396
397	exit(rval);
398}
399
400int
401ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
402{
403	char realfsfile[PATH_MAX];
404	int i;
405
406	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
407		/* the root file system can always be remounted */
408		return (0);
409
410	/* The user may have specified a symlink in fstab, resolve the path */
411	if (realpath(fs->fs_file, realfsfile) == NULL) {
412		/* Cannot resolve the path, use original one */
413		strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
414	}
415
416	for (i = mntsize - 1; i >= 0; --i)
417		if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
418		    (!isremountable(fs->fs_vfstype) ||
419		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
420			return (1);
421	return (0);
422}
423
424int
425isremountable(const char *vfsname)
426{
427	const char **cp;
428
429	for (cp = remountable_fs_names; *cp; cp++)
430		if (strcmp(*cp, vfsname) == 0)
431			return (1);
432	return (0);
433}
434
435int
436hasopt(const char *mntopts, const char *option)
437{
438	int negative, found;
439	char *opt, *optbuf;
440
441	if (option[0] == 'n' && option[1] == 'o') {
442		negative = 1;
443		option += 2;
444	} else
445		negative = 0;
446	optbuf = strdup(mntopts);
447	found = 0;
448	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
449		if (opt[0] == 'n' && opt[1] == 'o') {
450			if (!strcasecmp(opt + 2, option))
451				found = negative;
452		} else if (!strcasecmp(opt, option))
453			found = !negative;
454	}
455	free(optbuf);
456	return (found);
457}
458
459int
460mountfs(const char *vfstype, const char *spec, const char *name, int flags,
461	const char *options, const char *mntopts)
462{
463	char *argv[100];
464	struct statfs sf;
465	int argc, i, ret;
466	char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
467
468	/* resolve the mountpoint with realpath(3) */
469	(void)checkpath(name, mntpath);
470	name = mntpath;
471
472	if (mntopts == NULL)
473		mntopts = "";
474	optbuf = catopt(strdup(mntopts), options);
475
476	if (strcmp(name, "/") == 0)
477		flags |= MNT_UPDATE;
478	if (flags & MNT_FORCE)
479		optbuf = catopt(optbuf, "force");
480	if (flags & MNT_RDONLY)
481		optbuf = catopt(optbuf, "ro");
482	/*
483	 * XXX
484	 * The mount_mfs (newfs) command uses -o to select the
485	 * optimization mode.  We don't pass the default "-o rw"
486	 * for that reason.
487	 */
488	if (flags & MNT_UPDATE)
489		optbuf = catopt(optbuf, "update");
490
491	/* Compatibility glue. */
492	if (strcmp(vfstype, "msdos") == 0)
493		vfstype = "msdosfs";
494
495	/* Construct the name of the appropriate mount command */
496	(void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
497
498	argc = 0;
499	argv[argc++] = execname;
500	mangle(optbuf, &argc, argv);
501	argv[argc++] = strdup(spec);
502	argv[argc++] = strdup(name);
503	argv[argc] = NULL;
504
505	if (debug) {
506		(void)printf("exec: mount_%s", vfstype);
507		for (i = 1; i < argc; i++)
508			(void)printf(" %s", argv[i]);
509		(void)printf("\n");
510		return (0);
511	}
512
513	if (use_mountprog(vfstype)) {
514		ret = exec_mountprog(name, execname, argv);
515	} else {
516		ret = mount_fs(vfstype, argc, argv);
517	}
518
519	free(optbuf);
520
521	if (verbose) {
522		if (statfs(name, &sf) < 0) {
523			warn("statfs %s", name);
524			return (1);
525		}
526		if (fstab_style)
527			putfsent(&sf);
528		else
529			prmount(&sf);
530	}
531
532	return (0);
533}
534
535void
536prmount(struct statfs *sfp)
537{
538	int flags;
539	unsigned int i;
540	struct opt *o;
541	struct passwd *pw;
542
543	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
544	    sfp->f_fstypename);
545
546	flags = sfp->f_flags & MNT_VISFLAGMASK;
547	for (o = optnames; flags && o->o_opt; o++)
548		if (flags & o->o_opt) {
549			(void)printf(", %s", o->o_name);
550			flags &= ~o->o_opt;
551		}
552	/*
553	 * Inform when file system is mounted by an unprivileged user
554	 * or privileged non-root user.
555	 */
556	if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
557		(void)printf(", mounted by ");
558		if ((pw = getpwuid(sfp->f_owner)) != NULL)
559			(void)printf("%s", pw->pw_name);
560		else
561			(void)printf("%d", sfp->f_owner);
562	}
563	if (verbose) {
564		if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
565			(void)printf(", writes: sync %ju async %ju",
566			    (uintmax_t)sfp->f_syncwrites,
567			    (uintmax_t)sfp->f_asyncwrites);
568		if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
569			(void)printf(", reads: sync %ju async %ju",
570			    (uintmax_t)sfp->f_syncreads,
571			    (uintmax_t)sfp->f_asyncreads);
572		if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
573			printf(", fsid ");
574			for (i = 0; i < sizeof(sfp->f_fsid); i++)
575				printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
576		}
577	}
578	(void)printf(")\n");
579}
580
581struct statfs *
582getmntpt(const char *name)
583{
584	struct statfs *mntbuf;
585	int i, mntsize;
586
587	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
588	for (i = mntsize - 1; i >= 0; i--) {
589		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
590		    strcmp(mntbuf[i].f_mntonname, name) == 0)
591			return (&mntbuf[i]);
592	}
593	return (NULL);
594}
595
596char *
597catopt(char *s0, const char *s1)
598{
599	size_t i;
600	char *cp;
601
602	if (s1 == NULL || *s1 == '\0')
603		return (s0);
604
605	if (s0 && *s0) {
606		i = strlen(s0) + strlen(s1) + 1 + 1;
607		if ((cp = malloc(i)) == NULL)
608			errx(1, "malloc failed");
609		(void)snprintf(cp, i, "%s,%s", s0, s1);
610	} else
611		cp = strdup(s1);
612
613	if (s0)
614		free(s0);
615	return (cp);
616}
617
618void
619mangle(char *options, int *argcp, char *argv[])
620{
621	char *p, *s;
622	int argc;
623
624	argc = *argcp;
625	for (s = options; (p = strsep(&s, ",")) != NULL;)
626		if (*p != '\0') {
627			if (strcmp(p, "noauto") == 0) {
628				/*
629				 * Do not pass noauto option to nmount().
630				 * or external mount program.  noauto is
631				 * only used to prevent mounting a filesystem
632				 * when 'mount -a' is specified, and is
633				 * not a real mount option.
634				 */
635				continue;
636			} else if (strcmp(p, "late") == 0) {
637				/*
638				 * "late" is used to prevent certain file
639				 * systems from being mounted before late
640				 * in the boot cycle; for instance,
641				 * loopback NFS mounts can't be mounted
642				 * before mountd starts.
643				 */
644				continue;
645			} else if (strcmp(p, "userquota") == 0) {
646				continue;
647			} else if (strncmp(p, userquotaeq,
648			    sizeof(userquotaeq) - 1) == 0) {
649				continue;
650			} else if (strcmp(p, "groupquota") == 0) {
651				continue;
652			} else if (strncmp(p, groupquotaeq,
653			    sizeof(groupquotaeq) - 1) == 0) {
654				continue;
655			} else if (*p == '-') {
656				argv[argc++] = p;
657				p = strchr(p, '=');
658				if (p != NULL) {
659					*p = '\0';
660					argv[argc++] = p+1;
661				}
662			} else {
663				argv[argc++] = strdup("-o");
664				argv[argc++] = p;
665			}
666		}
667
668	*argcp = argc;
669}
670
671
672char *
673update_options(char *opts, char *fstab, int curflags)
674{
675	char *o, *p;
676	char *cur;
677	char *expopt, *newopt, *tmpopt;
678
679	if (opts == NULL)
680		return (strdup(""));
681
682	/* remove meta options from list */
683	remopt(fstab, MOUNT_META_OPTION_FSTAB);
684	remopt(fstab, MOUNT_META_OPTION_CURRENT);
685	cur = flags2opts(curflags);
686
687	/*
688	 * Expand all meta-options passed to us first.
689	 */
690	expopt = NULL;
691	for (p = opts; (o = strsep(&p, ",")) != NULL;) {
692		if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
693			expopt = catopt(expopt, fstab);
694		else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
695			expopt = catopt(expopt, cur);
696		else
697			expopt = catopt(expopt, o);
698	}
699	free(cur);
700	free(opts);
701
702	/*
703	 * Remove previous contradictory arguments. Given option "foo" we
704	 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
705	 * and "foo" - so we can deal with possible options like "notice".
706	 */
707	newopt = NULL;
708	for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
709		if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
710			errx(1, "malloc failed");
711
712		strcpy(tmpopt, "no");
713		strcat(tmpopt, o);
714		remopt(newopt, tmpopt);
715		free(tmpopt);
716
717		if (strncmp("no", o, 2) == 0)
718			remopt(newopt, o+2);
719
720		newopt = catopt(newopt, o);
721	}
722	free(expopt);
723
724	return (newopt);
725}
726
727void
728remopt(char *string, const char *opt)
729{
730	char *o, *p, *r;
731
732	if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
733		return;
734
735	r = string;
736
737	for (p = string; (o = strsep(&p, ",")) != NULL;) {
738		if (strcmp(opt, o) != 0) {
739			if (*r == ',' && *o != '\0')
740				r++;
741			while ((*r++ = *o++) != '\0')
742			    ;
743			*--r = ',';
744		}
745	}
746	*r = '\0';
747}
748
749void
750usage(void)
751{
752
753	(void)fprintf(stderr, "%s\n%s\n%s\n",
754"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
755"       mount [-dfpruvw] special | node",
756"       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
757	exit(1);
758}
759
760void
761putfsent(const struct statfs *ent)
762{
763	struct fstab *fst;
764	char *opts;
765
766	opts = flags2opts(ent->f_flags);
767
768	/*
769	 * "rw" is not a real mount option; this is why we print NULL as "rw"
770	 * if opts is still NULL here.
771	 */
772	printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
773	    ent->f_fstypename, opts ? opts : "rw");
774	free(opts);
775
776	if ((fst = getfsspec(ent->f_mntfromname)))
777		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
778	else if ((fst = getfsfile(ent->f_mntonname)))
779		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
780	else if (strcmp(ent->f_fstypename, "ufs") == 0) {
781		if (strcmp(ent->f_mntonname, "/") == 0)
782			printf("\t1 1\n");
783		else
784			printf("\t2 2\n");
785	} else
786		printf("\t0 0\n");
787}
788
789
790char *
791flags2opts(int flags)
792{
793	char *res;
794
795	res = NULL;
796
797	if (flags & MNT_RDONLY)		res = catopt(res, "ro");
798	if (flags & MNT_SYNCHRONOUS)	res = catopt(res, "sync");
799	if (flags & MNT_NOEXEC)		res = catopt(res, "noexec");
800	if (flags & MNT_NOSUID)		res = catopt(res, "nosuid");
801	if (flags & MNT_UNION)		res = catopt(res, "union");
802	if (flags & MNT_ASYNC)		res = catopt(res, "async");
803	if (flags & MNT_NOATIME)	res = catopt(res, "noatime");
804	if (flags & MNT_NOCLUSTERR)	res = catopt(res, "noclusterr");
805	if (flags & MNT_NOCLUSTERW)	res = catopt(res, "noclusterw");
806	if (flags & MNT_NOSYMFOLLOW)	res = catopt(res, "nosymfollow");
807	if (flags & MNT_SUIDDIR)	res = catopt(res, "suiddir");
808	if (flags & MNT_MULTILABEL)	res = catopt(res, "multilabel");
809	if (flags & MNT_ACLS)		res = catopt(res, "acls");
810
811	return (res);
812}
813