mount.c revision 25120 
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 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
41static char sccsid[] = "@(#)mount.c	8.25 (Berkeley) 5/8/95";
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 <err.h>
50#include <errno.h>
51#include <fstab.h>
52#include <pwd.h>
53#include <signal.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59#include "pathnames.h"
60
61int debug, fstab_style, verbose;
62
63int	checkvfsname __P((const char *, const char **));
64char   *catopt __P((char *, const char *));
65struct statfs
66       *getmntpt __P((const char *));
67int	hasopt __P((const char *, const char *));
68const char
69      **makevfslist __P((char *));
70void	mangle __P((char *, int *, const char **));
71int	mountfs __P((const char *, const char *, const char *,
72			int, const char *, const char *));
73void	prmount __P((struct statfs *));
74void	putfsent __P((const struct statfs *));
75void	usage __P((void));
76
77/* From mount_ufs.c. */
78int	mount_ufs __P((int, char * const *));
79
80/* Map from mount otions to printable formats. */
81static struct opt {
82	int o_opt;
83	const char *o_name;
84} optnames[] = {
85	{ MNT_ASYNC,		"asynchronous" },
86	{ MNT_EXPORTED,		"NFS exported" },
87	{ MNT_LOCAL,		"local" },
88	{ MNT_NOATIME,		"noatime" },
89	{ MNT_NODEV,		"nodev" },
90	{ MNT_NOEXEC,		"noexec" },
91	{ MNT_NOSUID,		"nosuid" },
92	{ MNT_QUOTA,		"with quotas" },
93	{ MNT_RDONLY,		"read-only" },
94	{ MNT_SYNCHRONOUS,	"synchronous" },
95	{ MNT_UNION,		"union" },
96	{ NULL }
97};
98
99int
100main(argc, argv)
101	int argc;
102	char * const argv[];
103{
104	const char *mntfromname, **vfslist, *vfstype;
105	struct fstab *fs;
106	struct statfs *mntbuf;
107	FILE *mountdfp;
108	pid_t pid;
109	int all, ch, i, init_flags, mntsize, rval;
110	char *options;
111
112	all = init_flags = 0;
113	options = NULL;
114	vfslist = NULL;
115	vfstype = "ufs";
116	while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
117		switch (ch) {
118		case 'a':
119			all = 1;
120			break;
121		case 'd':
122			debug = 1;
123			break;
124		case 'f':
125			init_flags |= MNT_FORCE;
126			break;
127		case 'o':
128			if (*optarg)
129				options = catopt(options, optarg);
130			break;
131		case 'p':
132			fstab_style = 1;
133			verbose = 1;
134			break;
135		case 'r':
136			init_flags |= MNT_RDONLY;
137			break;
138		case 't':
139			if (vfslist != NULL)
140				errx(1, "only one -t option may be specified.");
141			vfslist = makevfslist(optarg);
142			vfstype = optarg;
143			break;
144		case 'u':
145			init_flags |= MNT_UPDATE;
146			break;
147		case 'v':
148			verbose = 1;
149			break;
150		case 'w':
151			init_flags &= ~MNT_RDONLY;
152			break;
153		case '?':
154		default:
155			usage();
156			/* NOTREACHED */
157		}
158	argc -= optind;
159	argv += optind;
160
161#define	BADTYPE(type)							\
162	(strcmp(type, FSTAB_RO) &&					\
163	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
164
165	rval = 0;
166	switch (argc) {
167	case 0:
168		if (all)
169			while ((fs = getfsent()) != NULL) {
170				if (BADTYPE(fs->fs_type))
171					continue;
172				if (checkvfsname(fs->fs_vfstype, vfslist))
173					continue;
174				if (hasopt(fs->fs_mntops, "noauto"))
175					continue;
176				if (mountfs(fs->fs_vfstype, fs->fs_spec,
177				    fs->fs_file, init_flags, options,
178				    fs->fs_mntops))
179					rval = 1;
180			}
181		else if (fstab_style) {
182			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
183				err(1, "getmntinfo");
184			for (i = 0; i < mntsize; i++) {
185				if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
186					continue;
187				putfsent(&mntbuf[i]);
188			}
189		} else {
190			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
191				err(1, "getmntinfo");
192			for (i = 0; i < mntsize; i++) {
193				if (checkvfsname(mntbuf[i].f_fstypename,
194				    vfslist))
195					continue;
196				prmount(&mntbuf[i]);
197			}
198		}
199		exit(rval);
200	case 1:
201		if (vfslist != NULL)
202			usage();
203
204		if (init_flags & MNT_UPDATE) {
205			if ((mntbuf = getmntpt(*argv)) == NULL)
206				errx(1,
207				    "unknown special file or file system %s.",
208				    *argv);
209			if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL)
210				mntfromname = fs->fs_spec;
211			else
212				mntfromname = mntbuf->f_mntfromname;
213			rval = mountfs(mntbuf->f_fstypename, mntfromname,
214			    mntbuf->f_mntonname, init_flags, options, 0);
215			break;
216		}
217		if ((fs = getfsfile(*argv)) == NULL &&
218		    (fs = getfsspec(*argv)) == NULL)
219			errx(1, "%s: unknown special file or file system.",
220			    *argv);
221		if (BADTYPE(fs->fs_type))
222			errx(1, "%s has unknown file system type.",
223			    *argv);
224		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
225		    init_flags, options, fs->fs_mntops);
226		break;
227	case 2:
228		/*
229		 * If -t flag has not been specified, and spec contains either
230		 * a ':' or a '@' then assume that an NFS filesystem is being
231		 * specified ala Sun.
232		 */
233		if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL)
234			vfstype = "nfs";
235		rval = mountfs(vfstype,
236		    argv[0], argv[1], init_flags, options, NULL);
237		break;
238	default:
239		usage();
240		/* NOTREACHED */
241	}
242
243	/*
244	 * If the mount was successfully, and done by root, tell mountd the
245	 * good news.  Pid checks are probably unnecessary, but don't hurt.
246	 */
247	if (rval == 0 && getuid() == 0 &&
248	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
249		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
250		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
251			err(1, "signal mountd");
252		(void)fclose(mountdfp);
253	}
254
255	exit(rval);
256}
257
258int
259hasopt(mntopts, option)
260	const char *mntopts, *option;
261{
262	int negative, found;
263	char *opt, *optbuf;
264
265	if (option[0] == 'n' && option[1] == 'o') {
266		negative = 1;
267		option += 2;
268	} else
269		negative = 0;
270	optbuf = strdup(mntopts);
271	found = 0;
272	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
273		if (opt[0] == 'n' && opt[1] == 'o') {
274			if (!strcasecmp(opt + 2, option))
275				found = negative;
276		} else if (!strcasecmp(opt, option))
277			found = !negative;
278	}
279	free(optbuf);
280	return (found);
281}
282
283int
284mountfs(vfstype, spec, name, flags, options, mntopts)
285	const char *vfstype, *spec, *name, *options, *mntopts;
286	int flags;
287{
288	/* List of directories containing mount_xxx subcommands. */
289	static const char *edirs[] = {
290		_PATH_SBIN,
291		_PATH_USRSBIN,
292		NULL
293	};
294	const char *argv[100], **edir;
295	struct stat sb;
296	struct statfs sf;
297	pid_t pid;
298	int argc, i, status;
299	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
300
301	if (realpath(name, mntpath) != NULL && stat(mntpath, &sb) == 0) {
302		if (!S_ISDIR(sb.st_mode)) {
303			warnx("%s: Not a directory", mntpath);
304			return (1);
305		}
306	} else {
307		warn("%s", mntpath);
308		return (1);
309	}
310
311	name = mntpath;
312
313	if (mntopts == NULL)
314		mntopts = "";
315	if (options == NULL) {
316		if (*mntopts == '\0') {
317			options = "rw";
318		} else {
319			options = mntopts;
320			mntopts = "";
321		}
322	}
323	optbuf = catopt(strdup(mntopts), options);
324
325	if (strcmp(name, "/") == 0)
326		flags |= MNT_UPDATE;
327	if (flags & MNT_FORCE)
328		optbuf = catopt(optbuf, "force");
329	if (flags & MNT_RDONLY)
330		optbuf = catopt(optbuf, "ro");
331	/*
332	 * XXX
333	 * The mount_mfs (newfs) command uses -o to select the
334	 * optimisation mode.  We don't pass the default "-o rw"
335	 * for that reason.
336	 */
337	if (flags & MNT_UPDATE)
338		optbuf = catopt(optbuf, "update");
339
340	argc = 0;
341	argv[argc++] = vfstype;
342	mangle(optbuf, &argc, argv);
343	argv[argc++] = spec;
344	argv[argc++] = name;
345	argv[argc] = NULL;
346
347	if (debug) {
348		(void)printf("exec: mount_%s", vfstype);
349		for (i = 1; i < argc; i++)
350			(void)printf(" %s", argv[i]);
351		(void)printf("\n");
352		return (0);
353	}
354
355	switch (pid = fork()) {
356	case -1:				/* Error. */
357		warn("fork");
358		free(optbuf);
359		return (1);
360	case 0:					/* Child. */
361		if (strcmp(vfstype, "ufs") == 0)
362			exit(mount_ufs(argc, (char * const *) argv));
363
364		/* Go find an executable. */
365		for (edir = edirs; *edir; edir++) {
366			(void)snprintf(execname,
367			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
368			execv(execname, (char * const *)argv);
369		}
370		if (errno == ENOENT) {
371			int len = 0;
372			char *cp;
373			for (edir = edirs; *edir; edir++)
374				len += strlen(*edir) + 2;	/* ", " */
375			if ((cp = malloc(len)) == NULL) {
376				warn(NULL);
377				exit(1);
378			}
379			cp[0] = '\0';
380			for (edir = edirs; *edir; edir++) {
381				strcat(cp, *edir);
382				if (edir[1] != NULL)
383					strcat(cp, ", ");
384			}
385			warn("exec mount_%s not found in %s", vfstype, cp);
386		}
387		exit(1);
388		/* NOTREACHED */
389	default:				/* Parent. */
390		free(optbuf);
391
392		if (waitpid(pid, &status, 0) < 0) {
393			warn("waitpid");
394			return (1);
395		}
396
397		if (WIFEXITED(status)) {
398			if (WEXITSTATUS(status) != 0)
399				return (WEXITSTATUS(status));
400		} else if (WIFSIGNALED(status)) {
401			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
402			return (1);
403		}
404
405		if (verbose) {
406			if (statfs(name, &sf) < 0) {
407				warn("statfs %s", name);
408				return (1);
409			}
410			if (fstab_style)
411				putfsent(&sf);
412			else
413				prmount(&sf);
414		}
415		break;
416	}
417
418	return (0);
419}
420
421void
422prmount(sfp)
423	struct statfs *sfp;
424{
425	int flags;
426	struct opt *o;
427	struct passwd *pw;
428	int f;
429
430	(void)printf("%s on %s", sfp->f_mntfromname, sfp->f_mntonname);
431
432	flags = sfp->f_flags & MNT_VISFLAGMASK;
433	for (f = 0, o = optnames; flags && o->o_opt; o++)
434		if (flags & o->o_opt) {
435			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
436			flags &= ~o->o_opt;
437		}
438	if (sfp->f_owner) {
439		(void)printf("%smounted by ", !f++ ? " (" : ", ");
440		if ((pw = getpwuid(sfp->f_owner)) != NULL)
441			(void)printf("%s", pw->pw_name);
442		else
443			(void)printf("%d", sfp->f_owner);
444	}
445	(void)printf(f ? ")\n" : "\n");
446}
447
448struct statfs *
449getmntpt(name)
450	const char *name;
451{
452	struct statfs *mntbuf;
453	int i, mntsize;
454
455	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
456	for (i = 0; i < mntsize; i++)
457		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
458		    strcmp(mntbuf[i].f_mntonname, name) == 0)
459			return (&mntbuf[i]);
460	return (NULL);
461}
462
463char *
464catopt(s0, s1)
465	char *s0;
466	const char *s1;
467{
468	size_t i;
469	char *cp;
470
471	if (s0 && *s0) {
472		i = strlen(s0) + strlen(s1) + 1 + 1;
473		if ((cp = malloc(i)) == NULL)
474			err(1, NULL);
475		(void)snprintf(cp, i, "%s,%s", s0, s1);
476	} else
477		cp = strdup(s1);
478
479	if (s0)
480		free(s0);
481	return (cp);
482}
483
484void
485mangle(options, argcp, argv)
486	char *options;
487	int *argcp;
488	const char **argv;
489{
490	char *p, *s;
491	int argc;
492
493	argc = *argcp;
494	for (s = options; (p = strsep(&s, ",")) != NULL;)
495		if (*p != '\0')
496			if (*p == '-') {
497				argv[argc++] = p;
498				p = strchr(p, '=');
499				if (p) {
500					*p = '\0';
501					argv[argc++] = p+1;
502				}
503			} else if (strcmp(p, "rw") != 0) {
504				argv[argc++] = "-o";
505				argv[argc++] = p;
506			}
507
508	*argcp = argc;
509}
510
511void
512usage()
513{
514
515	(void)fprintf(stderr,
516		"usage: mount %s %s\n       mount %s\n       mount %s\n",
517		"[-dfpruvw] [-o options] [-t ufs | external_type]",
518			"special node",
519		"[-adfpruvw] [-t ufs | external_type]",
520		"[-dfpruvw] special | node");
521	exit(1);
522}
523
524void
525putfsent(ent)
526	const struct statfs *ent;
527{
528	struct fstab *fst;
529
530	printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
531	    ent->f_fstypename, (ent->f_flags & MNT_RDONLY) ? "ro" : "rw");
532
533	/* XXX should use optnames[] - put shorter names in it. */
534	if (ent->f_flags & MNT_SYNCHRONOUS)
535		printf(",sync");
536	if (ent->f_flags & MNT_NOEXEC)
537		printf(",noexec");
538	if (ent->f_flags & MNT_NOSUID)
539		printf(",nosuid");
540	if (ent->f_flags & MNT_NODEV)
541		printf(",nodev");
542	if (ent->f_flags & MNT_UNION)
543		printf(",union");
544	if (ent->f_flags & MNT_ASYNC)
545		printf(",async");
546	if (ent->f_flags & MNT_NOATIME)
547		printf(",noatime");
548
549	if (fst = getfsspec(ent->f_mntfromname))
550		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
551	else if (fst = getfsfile(ent->f_mntonname))
552		printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
553	else if (ent->f_type == MOUNT_UFS)
554		printf("\t1 1\n");
555	else
556		printf("\t0 0\n");
557}
558