1/*
2 * Copyright (c) 1999-2009 Apple Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23/*-
24 * Copyright (c) 1980, 1989, 1993, 1994
25 *	The Regents of the University of California.  All rights reserved.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in the
34 *    documentation and/or other materials provided with the distribution.
35 * 3. All advertising materials mentioning features or use of this software
36 *    must display the following acknowledgement:
37 *	This product includes software developed by the University of
38 *	California, Berkeley and its contributors.
39 * 4. Neither the name of the University nor the names of its contributors
40 *    may be used to endorse or promote products derived from this software
41 *    without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 */
55
56
57#include <sys/param.h>
58#include <sys/mount.h>
59#include <sys/wait.h>
60
61#include <err.h>
62#include <errno.h>
63#include <fstab.h>
64#include <pwd.h>
65#include <signal.h>
66#include <stdio.h>
67#include <stdlib.h>
68#include <string.h>
69#include <unistd.h>
70
71#include "pathnames.h"
72
73int debug, verbose;
74
75int	checkvfsname __P((const char *, const char **));
76char   *catopt __P((char *, const char *));
77struct statfs *getmntpt __P((const char *));
78int	hasopt __P((const char *, const char *));
79int	ismounted __P((const char *, const char *));
80const char
81      **makevfslist __P((char *));
82void	mangle __P((char *, int *, const char **));
83int	mountfs __P((const char *, const char *, const char *,
84			int, const char *, const char *));
85void	prmount __P((struct statfs *));
86void	usage __P((void));
87
88/* Map from mount otions to printable formats. */
89static struct opt {
90	int o_opt;
91	const char *o_name;
92} optnames[] = {
93	{ MNT_ASYNC,		"asynchronous" },
94	{ MNT_EXPORTED,		"NFS exported" },
95	{ MNT_LOCAL,		"local" },
96	{ MNT_NODEV,		"nodev" },
97	{ MNT_NOEXEC,		"noexec" },
98	{ MNT_NOSUID,		"nosuid" },
99	{ MNT_QUOTA,		"with quotas" },
100	{ MNT_RDONLY,		"read-only" },
101	{ MNT_SYNCHRONOUS,	"synchronous" },
102	{ MNT_UNION,		"union" },
103	{ MNT_AUTOMOUNTED,	"automounted" },
104	{ MNT_JOURNALED,	"journaled" },
105	{ MNT_DEFWRITE, 	"defwrite" },
106	{ MNT_IGNORE_OWNERSHIP,	"noowners" },
107	{ MNT_NOATIME,		"noatime" },
108	{ MNT_QUARANTINE,	"quarantine" },
109	{ MNT_DONTBROWSE,	"nobrowse"},
110	{ MNT_CPROTECT,		"protect"},
111	{ 0, 				NULL }
112};
113
114
115int
116main(argc, argv)
117	int argc;
118	char * const argv[];
119{
120	const char *mntfromname, **vfslist, *vfstype;
121	struct fstab *fs;
122	struct statfs *mntbuf;
123	int all, ch, i, init_flags, mntsize, rval;
124	char *options;
125
126	all = init_flags = 0;
127	options = NULL;
128	vfslist = NULL;
129	vfstype = NULL;
130	while ((ch = getopt(argc, argv, "adfo:rwt:uv")) != EOF)
131		switch (ch) {
132		case 'a':
133			all = 1;
134			break;
135		case 'd':
136			debug = 1;
137			break;
138		case 'f':
139			init_flags |= MNT_FORCE;
140			break;
141		case 'o':
142            if (*optarg) {
143				options = catopt(options, optarg);
144                if (strstr(optarg, "union"))
145                    init_flags |= MNT_UNION;
146            }
147			break;
148		case 'r':
149			init_flags |= MNT_RDONLY;
150			break;
151		case 't':
152			if (vfslist != NULL)
153				errx(1, "only one -t option may be specified.");
154			vfslist = makevfslist(optarg);
155			vfstype = optarg;
156			break;
157		case 'u':
158			init_flags |= MNT_UPDATE;
159			break;
160		case 'v':
161			verbose = 1;
162			break;
163		case 'w':
164			init_flags &= ~MNT_RDONLY;
165			break;
166		case '?':
167		default:
168			usage();
169			/* NOTREACHED */
170		}
171	argc -= optind;
172	argv += optind;
173
174#define	BADTYPE(type)							\
175	(strcmp(type, FSTAB_RO) &&					\
176	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
177
178	rval = 0;
179	switch (argc) {
180	case 0:
181		if (all) {
182			setfsent();
183			while ((fs = getfsent()) != NULL) {
184				if (BADTYPE(fs->fs_type))
185					continue;
186				if (checkvfsname(fs->fs_vfstype, vfslist))
187					continue;
188				if (hasopt(fs->fs_mntops, "noauto"))
189					continue;
190				if (!strcmp(fs->fs_vfstype, "nfs")) {
191					if (hasopt(fs->fs_mntops, "net"))
192						continue;
193					/* check if already mounted */
194					if (fs->fs_spec == NULL ||
195					    fs->fs_file == NULL ||
196					    ismounted(fs->fs_spec, fs->fs_file))
197						continue;
198				}
199				if (mountfs(fs->fs_vfstype, fs->fs_spec,
200				    fs->fs_file, init_flags, options,
201				    fs->fs_mntops))
202					rval = 1;
203			}
204			endfsent();
205        	} else {
206			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
207				err(1, "getmntinfo");
208			for (i = 0; i < mntsize; i++) {
209				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
210					continue;
211				prmount(&mntbuf[i]);
212			}
213		}
214		exit(rval);
215	case 1:
216		if (vfslist != NULL)
217			usage();
218
219		if (init_flags & MNT_UPDATE) {
220			if ((mntbuf = getmntpt(*argv)) == NULL)
221				errx(1,
222				    "unknown special file or file system %s.",
223				    *argv);
224			/*
225			 * Handle the special case of upgrading the root file
226			 * system from read-only to read/write.  The root file
227			 * system was originally mounted with a "mount from" name
228			 * of "root_device".  The getfsfile("/") returns non-
229			 * NULL at this point, with fs_spec set to the true
230			 * path to the root device (regardless of what /etc/fstab
231			 * contains).
232			 */
233			mntfromname = mntbuf->f_mntfromname;
234			if (strchr(mntfromname, '/') == NULL) {
235				fs = getfsfile(mntbuf->f_mntonname);
236				if (fs != NULL)
237					mntfromname = fs->fs_spec;
238			}
239
240			/* Do the update mount */
241			rval = mountfs(mntbuf->f_fstypename, mntfromname,
242			    mntbuf->f_mntonname, init_flags, options, 0);
243			break;
244		}
245		if ((fs = getfsfile(*argv)) == NULL &&
246		    (fs = getfsspec(*argv)) == NULL)
247			errx(1, "%s: unknown special file or file system.",
248			    *argv);
249		if (BADTYPE(fs->fs_type))
250			errx(1, "%s has unknown file system type.",
251			    *argv);
252		if (!strcmp(fs->fs_vfstype, "nfs")) {
253			if (hasopt(fs->fs_mntops, "net"))
254				errx(1, "%s is owned by the automounter.", *argv);
255			if (ismounted(fs->fs_spec, fs->fs_file))
256				errx(1, "%s is already mounted at %s.",
257					fs->fs_spec, fs->fs_file);
258		}
259		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
260		    init_flags, options, fs->fs_mntops);
261		break;
262	case 2:
263		/*
264		 * If -t flag has not been specified, and spec contains a ':'
265		 * then assume that an NFS filesystem is being specified.
266		 */
267		if (vfslist == NULL && strchr(argv[0], ':') != NULL) {
268			vfstype = "nfs";
269			/* check if already mounted */
270			if (ismounted(argv[0], argv[1]))
271				errx(1, "%s is already mounted at %s.",
272					argv[0], argv[1]);
273		}
274
275		/* If we have both a devnode and a pathname, and an update mount was requested,
276		 * then figure out where the devnode is mounted.  We will need to run
277		 * an update mount on its path.  It wouldn't make sense to do an
278		 * update mount on a path other than the one it's already using.
279		 *
280		 * XXX: Should we implement the same workaround for updating the
281		 * root file system at boot time?
282		 */
283		if (init_flags & MNT_UPDATE) {
284			if ((mntbuf = getmntpt(*argv)) == NULL)
285				errx(1,"unknown special file or file system %s.", *argv);
286			rval = mountfs(mntbuf->f_fstypename, mntbuf->f_mntfromname,
287					mntbuf->f_mntonname, init_flags, options, 0);
288		}
289		else {
290			/*
291			 * If update mount not requested, then go with the vfstype and arguments
292			 * specified.  If no vfstype specified, then error out.
293			 */
294			if (vfstype == NULL) {
295				errx (1, "You must specify a filesystem type with -t.");
296			}
297			rval = mountfs(vfstype,
298					argv[0], argv[1], init_flags, options, NULL);
299		}
300		break;
301	default:
302		usage();
303		/* NOTREACHED */
304	}
305
306	exit(rval);
307}
308
309int
310hasopt(mntopts, option)
311	const char *mntopts, *option;
312{
313	int negative, found;
314	char *opt, *optbuf;
315
316	if (option[0] == 'n' && option[1] == 'o') {
317		negative = 1;
318		option += 2;
319	} else
320		negative = 0;
321	optbuf = strdup(mntopts);
322	found = 0;
323	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
324		if (opt[0] == 'n' && opt[1] == 'o') {
325			if (!strcasecmp(opt + 2, option))
326				found = negative;
327		} else if (!strcasecmp(opt, option))
328			found = !negative;
329	}
330	free(optbuf);
331	return (found);
332}
333
334int
335ismounted(fs_spec, fs_file)
336	const char *fs_spec, *fs_file;
337{
338	int i, mntsize;
339	struct statfs *mntbuf;
340
341	if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
342		err(1, "getmntinfo");
343	for (i = 0; i < mntsize; i++) {
344		if (strcmp(mntbuf[i].f_mntfromname, fs_spec))
345			continue;
346		if (strcmp(mntbuf[i].f_mntonname, fs_file))
347			continue;
348		return 1;
349	}
350	return 0;
351}
352
353int
354mountfs(vfstype, spec, name, flags, options, mntopts)
355	const char *vfstype, *spec, *name, *options, *mntopts;
356	int flags;
357{
358	/* List of directories containing mount_xxx subcommands. */
359	static const char *edirs[] = {
360		_PATH_SBIN,
361		_PATH_USRSBIN,
362		_PATH_FSBNDL,	/* always last */
363		NULL
364	};
365	const char *argv[100], **edir;
366	struct statfs sf;
367	pid_t pid;
368	int argc, i, status;
369	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
370
371	if (realpath(name, mntpath) == NULL) {
372		warn("realpath %s", mntpath);
373		return (1);
374	}
375
376	name = mntpath;
377
378	if (mntopts == NULL)
379		mntopts = "";
380	if (options == NULL) {
381		if (*mntopts == '\0') {
382			options = "";
383		} else {
384			options = mntopts;
385			mntopts = "";
386		}
387	}
388	optbuf = catopt(strdup(mntopts), options);
389
390	if ((strcmp(name, "/") == 0) && !(flags & MNT_UNION))
391		flags |= MNT_UPDATE;
392	if (flags & MNT_FORCE)
393		optbuf = catopt(optbuf, "force");
394	if (flags & MNT_RDONLY)
395		optbuf = catopt(optbuf, "ro");
396	if (flags & MNT_UPDATE)
397		optbuf = catopt(optbuf, "update");
398
399	argc = 0;
400	argv[argc++] = vfstype;
401	mangle(optbuf, &argc, argv);
402	argv[argc++] = spec;
403	argv[argc++] = name;
404	argv[argc] = NULL;
405
406	if (debug) {
407		(void)printf("exec: mount_%s", vfstype);
408		for (i = 1; i < argc; i++)
409			(void)printf(" %s", argv[i]);
410		(void)printf("\n");
411		return (0);
412	}
413
414	switch (pid = fork()) {
415	case -1:				/* Error. */
416		warn("fork");
417		free(optbuf);
418		return (1);
419	case 0:					/* Child. */
420		/* Go find an executable. */
421		edir = edirs;
422		do {
423			/* Special case file system bundle executable path */
424			if (*(edir+1) == NULL)
425				(void)snprintf(execname, sizeof(execname),
426					"%s/%s.fs/%s/mount_%s", *edir,
427					vfstype, _PATH_FSBNDLBIN, vfstype);
428			else
429				(void)snprintf(execname, sizeof(execname),
430					"%s/mount_%s", *edir, vfstype);
431
432			argv[0] = execname;
433			execv(execname, (char * const *)argv);
434			if (errno != ENOENT)
435				warn("exec %s for %s", execname, name);
436		} while (*++edir != NULL);
437
438		if (errno == ENOENT)
439			warn("exec %s for %s", execname, name);
440		exit(1);
441		/* NOTREACHED */
442	default:				/* Parent. */
443		free(optbuf);
444
445		if (waitpid(pid, &status, 0) < 0) {
446			warn("waitpid");
447			return (1);
448		}
449
450		if (WIFEXITED(status)) {
451			if (WEXITSTATUS(status) != 0)
452				return (WEXITSTATUS(status));
453		} else if (WIFSIGNALED(status)) {
454			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
455			return (1);
456		}
457
458		if (verbose) {
459			if (statfs(name, &sf) < 0) {
460				warn("statfs %s", name);
461				return (1);
462			}
463			prmount(&sf);
464		}
465		break;
466	}
467
468	return (0);
469}
470
471void
472prmount(sfp)
473	struct statfs *sfp;
474{
475	int flags;
476	struct opt *o;
477	struct passwd *pw;
478
479	(void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
480	    sfp->f_fstypename);
481
482	flags = sfp->f_flags & MNT_VISFLAGMASK;
483	for (o = optnames; flags && o->o_opt; o++)
484		if (flags & o->o_opt) {
485			(void)printf(", %s", o->o_name);
486			flags &= ~o->o_opt;
487		}
488	if (sfp->f_owner) {
489		(void)printf(", mounted by ");
490		if ((pw = getpwuid(sfp->f_owner)) != NULL)
491			(void)printf("%s", pw->pw_name);
492		else
493			(void)printf("%d", sfp->f_owner);
494	}
495	(void)printf(")\n");
496}
497
498struct statfs *
499getmntpt(name)
500	const char *name;
501{
502	struct statfs *mntbuf;
503	int i, mntsize;
504
505	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
506	for (i = 0; i < mntsize; i++) {
507		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
508		    strcmp(mntbuf[i].f_mntonname, name) == 0)
509			return (&mntbuf[i]);
510	}
511	return (NULL);
512}
513
514char *
515catopt(s0, s1)
516	char *s0;
517	const char *s1;
518{
519	size_t i;
520	char *cp;
521
522	if (s0 && *s0) {
523		i = strlen(s0) + strlen(s1) + 1 + 1;
524		if ((cp = malloc(i)) == NULL)
525			err(1, NULL);
526		(void)snprintf(cp, i, "%s,%s", s0, s1);
527	} else
528		cp = strdup(s1);
529
530	if (s0)
531		free(s0);
532	return (cp);
533}
534
535void
536mangle(options, argcp, argv)
537	char *options;
538	int *argcp;
539	const char **argv;
540{
541	char *p, *s;
542	int argc;
543
544	argc = *argcp;
545	for (s = options; (p = strsep(&s, ",")) != NULL;)
546		if (*p != '\0') {
547			if (*p == '-') {
548				argv[argc++] = p;
549				p = strchr(p, '=');
550				if (p) {
551					*p = '\0';
552					argv[argc++] = p+1;
553				}
554			} else {
555				argv[argc++] = "-o";
556				argv[argc++] = p;
557			}
558		}
559
560	*argcp = argc;
561}
562
563void
564usage()
565{
566
567	(void)fprintf(stderr,
568		"usage: mount %s %s\n       mount %s\n       mount %s\n",
569		"[-dfruvw] [-o options] [-t external_type]",
570			"special node",
571		"[-adfruvw] [-t external_type]",
572		"[-dfruvw] special | node");
573	exit(1);
574}
575