mount.c revision 29890 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1989, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)mount.c	8.25 (Berkeley) 5/8/95";
43#else
44static const char rcsid[] =
45	"$Id: mount.c,v 1.19 1997/08/24 21:02:49 steve Exp $";
46#endif
47#endif /* not lint */
48
49#include <sys/param.h>
50#include <sys/mount.h>
51#include <sys/stat.h>
52#include <sys/wait.h>
53
54#include <err.h>
55#include <errno.h>
56#include <fstab.h>
57#include <pwd.h>
58#include <signal.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64#include "extern.h"
65#include "pathnames.h"
66
67int debug, fstab_style, verbose;
68
69char   *catopt __P((char *, const char *));
70struct statfs
71       *getmntpt __P((const char *));
72int	hasopt __P((const char *, const char *));
73int	ismounted __P((struct fstab *, struct statfs *, int));
74int	isremountable __P((const char *));
75void	mangle __P((char *, int *, const char **));
76int	mountfs __P((const char *, const char *, const char *,
77			int, const char *, const char *));
78void	prmount __P((struct statfs *));
79void	putfsent __P((const struct statfs *));
80void	usage __P((void));
81
82/* Map from mount otions to printable formats. */
83static struct opt {
84	int o_opt;
85	const char *o_name;
86} optnames[] = {
87	{ MNT_ASYNC,		"asynchronous" },
88	{ MNT_EXPORTED,		"NFS exported" },
89	{ MNT_LOCAL,		"local" },
90	{ MNT_NOATIME,		"noatime" },
91	{ MNT_NODEV,		"nodev" },
92	{ MNT_NOEXEC,		"noexec" },
93	{ MNT_NOSUID,		"nosuid" },
94	{ MNT_QUOTA,		"with quotas" },
95	{ MNT_RDONLY,		"read-only" },
96	{ MNT_SYNCHRONOUS,	"synchronous" },
97	{ MNT_UNION,		"union" },
98	{ MNT_NOCLUSTERR,	"noclusterr" },
99	{ MNT_NOCLUSTERW,	"noclusterw" },
100	{ NULL }
101};
102
103/*
104 * List of VFS types that can be remounted without becoming mounted on top
105 * of each other.
106 * XXX Is this list correct?
107 */
108static const char *
109remountable_fs_names[] = {
110	"ufs", "ffs", "lfs", "ext2fs",
111	0
112};
113
114int
115main(argc, argv)
116	int argc;
117	char * const argv[];
118{
119	const char *mntfromname, **vfslist, *vfstype;
120	struct fstab *fs;
121	struct statfs *mntbuf;
122	FILE *mountdfp;
123	pid_t pid;
124	int all, ch, i, init_flags, mntsize, rval;
125	char *options;
126
127	all = init_flags = 0;
128	options = NULL;
129	vfslist = NULL;
130	vfstype = "ufs";
131	while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
132		switch (ch) {
133		case 'a':
134			all = 1;
135			break;
136		case 'd':
137			debug = 1;
138			break;
139		case 'f':
140			init_flags |= MNT_FORCE;
141			break;
142		case 'o':
143			if (*optarg)
144				options = catopt(options, optarg);
145			break;
146		case 'p':
147			fstab_style = 1;
148			verbose = 1;
149			break;
150		case 'r':
151			init_flags |= MNT_RDONLY;
152			break;
153		case 't':
154			if (vfslist != NULL)
155				errx(1, "only one -t option may be specified.");
156			vfslist = makevfslist(optarg);
157			vfstype = optarg;
158			break;
159		case 'u':
160			init_flags |= MNT_UPDATE;
161			break;
162		case 'v':
163			verbose = 1;
164			break;
165		case 'w':
166			init_flags &= ~MNT_RDONLY;
167			break;
168		case '?':
169		default:
170			usage();
171			/* NOTREACHED */
172		}
173	argc -= optind;
174	argv += optind;
175
176#define	BADTYPE(type)							\
177	(strcmp(type, FSTAB_RO) &&					\
178	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
179
180	rval = 0;
181	switch (argc) {
182	case 0:
183		if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
184			err(1, "getmntinfo");
185		if (all) {
186			while ((fs = getfsent()) != NULL) {
187				if (BADTYPE(fs->fs_type))
188					continue;
189				if (checkvfsname(fs->fs_vfstype, vfslist))
190					continue;
191				if (hasopt(fs->fs_mntops, "noauto"))
192					continue;
193				if (ismounted(fs, mntbuf, mntsize))
194					continue;
195				if (mountfs(fs->fs_vfstype, fs->fs_spec,
196				    fs->fs_file, init_flags, options,
197				    fs->fs_mntops))
198					rval = 1;
199			}
200		} else if (fstab_style) {
201			for (i = 0; i < mntsize; i++) {
202				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
203					continue;
204				putfsent(&mntbuf[i]);
205			}
206		} else {
207			for (i = 0; i < mntsize; i++) {
208				if (checkvfsname(mntbuf[i].f_fstypename,
209				    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			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL)
225				mntfromname = fs->fs_spec;
226			else
227				mntfromname = mntbuf->f_mntfromname;
228			rval = mountfs(mntbuf->f_fstypename, mntfromname,
229			    mntbuf->f_mntonname, init_flags, options, 0);
230			break;
231		}
232		if ((fs = getfsfile(*argv)) == NULL &&
233		    (fs = getfsspec(*argv)) == NULL)
234			errx(1, "%s: unknown special file or file system.",
235			    *argv);
236		if (BADTYPE(fs->fs_type))
237			errx(1, "%s has unknown file system type.",
238			    *argv);
239		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
240		    init_flags, options, fs->fs_mntops);
241		break;
242	case 2:
243		/*
244		 * If -t flag has not been specified, and spec contains either
245		 * a ':' or a '@' then assume that an NFS filesystem is being
246		 * specified ala Sun.
247		 */
248		if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL)
249			vfstype = "nfs";
250		rval = mountfs(vfstype,
251		    argv[0], argv[1], init_flags, options, NULL);
252		break;
253	default:
254		usage();
255		/* NOTREACHED */
256	}
257
258	/*
259	 * If the mount was successfully, and done by root, tell mountd the
260	 * good news.  Pid checks are probably unnecessary, but don't hurt.
261	 */
262	if (rval == 0 && getuid() == 0 &&
263	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
264		if (fscanf(mountdfp, "%d", &pid) == 1 &&
265		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
266			err(1, "signal mountd");
267		(void)fclose(mountdfp);
268	}
269
270	exit(rval);
271}
272
273int
274ismounted(fs, mntbuf, mntsize)
275	struct fstab *fs;
276	struct statfs *mntbuf;
277	int mntsize;
278{
279	int i;
280
281	if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
282		/* the root file system can always be remounted */
283		return (0);
284
285	for (i = mntsize - 1; i >= 0; --i)
286		if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
287		    (!isremountable(fs->fs_vfstype) ||
288		     strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
289			return (1);
290	return (0);
291}
292
293int
294isremountable(vfsname)
295	const char *vfsname;
296{
297	const char **cp;
298
299	for (cp = remountable_fs_names; *cp; cp++)
300		if (strcmp(*cp, vfsname) == 0)
301			return (1);
302	return (0);
303}
304
305int
306hasopt(mntopts, option)
307	const char *mntopts, *option;
308{
309	int negative, found;
310	char *opt, *optbuf;
311
312	if (option[0] == 'n' && option[1] == 'o') {
313		negative = 1;
314		option += 2;
315	} else
316		negative = 0;
317	optbuf = strdup(mntopts);
318	found = 0;
319	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
320		if (opt[0] == 'n' && opt[1] == 'o') {
321			if (!strcasecmp(opt + 2, option))
322				found = negative;
323		} else if (!strcasecmp(opt, option))
324			found = !negative;
325	}
326	free(optbuf);
327	return (found);
328}
329
330int
331mountfs(vfstype, spec, name, flags, options, mntopts)
332	const char *vfstype, *spec, *name, *options, *mntopts;
333	int flags;
334{
335	/* List of directories containing mount_xxx subcommands. */
336	static const char *edirs[] = {
337		_PATH_SBIN,
338		_PATH_USRSBIN,
339		NULL
340	};
341	const char *argv[100], **edir;
342	struct stat sb;
343	struct statfs sf;
344	pid_t pid;
345	int argc, i, status;
346	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
347
348#if __GNUC__
349	(void)&optbuf;
350	(void)&name;
351#endif
352
353	if (realpath(name, mntpath) != NULL && stat(mntpath, &sb) == 0) {
354		if (!S_ISDIR(sb.st_mode)) {
355			warnx("%s: Not a directory", mntpath);
356			return (1);
357		}
358	} else {
359		warn("%s", mntpath);
360		return (1);
361	}
362
363	name = mntpath;
364
365	if (mntopts == NULL)
366		mntopts = "";
367	if (options == NULL) {
368		if (*mntopts == '\0') {
369			options = "rw";
370		} else {
371			options = mntopts;
372			mntopts = "";
373		}
374	}
375	optbuf = catopt(strdup(mntopts), options);
376
377	if (strcmp(name, "/") == 0)
378		flags |= MNT_UPDATE;
379	if (flags & MNT_FORCE)
380		optbuf = catopt(optbuf, "force");
381	if (flags & MNT_RDONLY)
382		optbuf = catopt(optbuf, "ro");
383	/*
384	 * XXX
385	 * The mount_mfs (newfs) command uses -o to select the
386	 * optimisation mode.  We don't pass the default "-o rw"
387	 * for that reason.
388	 */
389	if (flags & MNT_UPDATE)
390		optbuf = catopt(optbuf, "update");
391
392	argc = 0;
393	argv[argc++] = vfstype;
394	mangle(optbuf, &argc, argv);
395	argv[argc++] = spec;
396	argv[argc++] = name;
397	argv[argc] = NULL;
398
399	if (debug) {
400		(void)printf("exec: mount_%s", vfstype);
401		for (i = 1; i < argc; i++)
402			(void)printf(" %s", argv[i]);
403		(void)printf("\n");
404		return (0);
405	}
406
407	switch (pid = fork()) {
408	case -1:				/* Error. */
409		warn("fork");
410		free(optbuf);
411		return (1);
412	case 0:					/* Child. */
413		if (strcmp(vfstype, "ufs") == 0)
414			exit(mount_ufs(argc, (char * const *) argv));
415
416		/* Go find an executable. */
417		for (edir = edirs; *edir; edir++) {
418			(void)snprintf(execname,
419			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
420			execv(execname, (char * const *)argv);
421		}
422		if (errno == ENOENT) {
423			int len = 0;
424			char *cp;
425			for (edir = edirs; *edir; edir++)
426				len += strlen(*edir) + 2;	/* ", " */
427			if ((cp = malloc(len)) == NULL) {
428				warn(NULL);
429				exit(1);
430			}
431			cp[0] = '\0';
432			for (edir = edirs; *edir; edir++) {
433				strcat(cp, *edir);
434				if (edir[1] != NULL)
435					strcat(cp, ", ");
436			}
437			warn("exec mount_%s not found in %s", vfstype, cp);
438		}
439		exit(1);
440		/* NOTREACHED */
441	default:				/* Parent. */
442		free(optbuf);
443
444		if (waitpid(pid, &status, 0) < 0) {
445			warn("waitpid");
446			return (1);
447		}
448
449		if (WIFEXITED(status)) {
450			if (WEXITSTATUS(status) != 0)
451				return (WEXITSTATUS(status));
452		} else if (WIFSIGNALED(status)) {
453			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
454			return (1);
455		}
456
457		if (verbose) {
458			if (statfs(name, &sf) < 0) {
459				warn("statfs %s", name);
460				return (1);
461			}
462			if (fstab_style)
463				putfsent(&sf);
464			else
465				prmount(&sf);
466		}
467		break;
468	}
469
470	return (0);
471}
472
473void
474prmount(sfp)
475	struct statfs *sfp;
476{
477	int flags;
478	struct opt *o;
479	struct passwd *pw;
480	int f;
481
482	(void)printf("%s on %s", sfp->f_mntfromname, sfp->f_mntonname);
483
484	flags = sfp->f_flags & MNT_VISFLAGMASK;
485	for (f = 0, o = optnames; flags && o->o_opt; o++)
486		if (flags & o->o_opt) {
487			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
488			flags &= ~o->o_opt;
489		}
490	if (sfp->f_owner) {
491		(void)printf("%smounted by ", !f++ ? " (" : ", ");
492		if ((pw = getpwuid(sfp->f_owner)) != NULL)
493			(void)printf("%s", pw->pw_name);
494		else
495			(void)printf("%d", sfp->f_owner);
496	}
497	(void)printf(f ? ")\n" : "\n");
498}
499
500struct statfs *
501getmntpt(name)
502	const char *name;
503{
504	struct statfs *mntbuf;
505	int i, mntsize;
506
507	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
508	for (i = 0; i < mntsize; i++)
509		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
510		    strcmp(mntbuf[i].f_mntonname, name) == 0)
511			return (&mntbuf[i]);
512	return (NULL);
513}
514
515char *
516catopt(s0, s1)
517	char *s0;
518	const char *s1;
519{
520	size_t i;
521	char *cp;
522
523	if (s0 && *s0) {
524		i = strlen(s0) + strlen(s1) + 1 + 1;
525		if ((cp = malloc(i)) == NULL)
526			err(1, NULL);
527		(void)snprintf(cp, i, "%s,%s", s0, s1);
528	} else
529		cp = strdup(s1);
530
531	if (s0)
532		free(s0);
533	return (cp);
534}
535
536void
537mangle(options, argcp, argv)
538	char *options;
539	int *argcp;
540	const char **argv;
541{
542	char *p, *s;
543	int argc;
544
545	argc = *argcp;
546	for (s = options; (p = strsep(&s, ",")) != NULL;)
547		if (*p != '\0')
548			if (*p == '-') {
549				argv[argc++] = p;
550				p = strchr(p, '=');
551				if (p) {
552					*p = '\0';
553					argv[argc++] = p+1;
554				}
555			} else if (strcmp(p, "rw") != 0) {
556				argv[argc++] = "-o";
557				argv[argc++] = p;
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		"[-dfpruvw] [-o options] [-t ufs | external_type]",
570			"special node",
571		"[-adfpruvw] [-t ufs | external_type]",
572		"[-dfpruvw] special | node");
573	exit(1);
574}
575
576void
577putfsent(ent)
578	const struct statfs *ent;
579{
580	struct fstab *fst;
581
582	printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
583	    ent->f_fstypename, (ent->f_flags & MNT_RDONLY) ? "ro" : "rw");
584
585	/* XXX should use optnames[] - put shorter names in it. */
586	if (ent->f_flags & MNT_SYNCHRONOUS)
587		printf(",sync");
588	if (ent->f_flags & MNT_NOEXEC)
589		printf(",noexec");
590	if (ent->f_flags & MNT_NOSUID)
591		printf(",nosuid");
592	if (ent->f_flags & MNT_NODEV)
593		printf(",nodev");
594	if (ent->f_flags & MNT_UNION)
595		printf(",union");
596	if (ent->f_flags & MNT_ASYNC)
597		printf(",async");
598	if (ent->f_flags & MNT_NOATIME)
599		printf(",noatime");
600	if (ent->f_flags & MNT_NOCLUSTERR)
601		printf(",noclusterr");
602	if (ent->f_flags & MNT_NOCLUSTERW)
603		printf(",noclusterw");
604
605	if ((fst = getfsspec(ent->f_mntfromname)))
606		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
607	else if ((fst = getfsfile(ent->f_mntonname)))
608		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
609	else if (ent->f_type == MOUNT_UFS)
610		printf("\t1 1\n");
611	else
612		printf("\t0 0\n");
613}
614