mount.c revision 18007 
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	8.19 (Berkeley) 4/19/94";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/mount.h>
46#include <sys/wait.h>
47#include <sys/types.h>
48#include <sys/stat.h>
49
50#include <err.h>
51#include <errno.h>
52#include <fstab.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, verbose, skipvfs;
62int fstab_style = 0;
63
64static char	*mnttype[] = INITMOUNTNAMES;
65
66int	badvfsname __P((const char *, const char **));
67int	badvfstype __P((int, const char **));
68char   *catopt __P((char *, const char *));
69struct statfs
70       *getmntpt __P((const char *));
71const char
72      **makevfslist __P((char *));
73void	mangle __P((char *, int *, const char **));
74int	mountfs __P((const char *, const char *, const char *,
75			int, const char *, const char *));
76void	prmount __P((const char *, const char *, int));
77void	usage __P((void));
78void	putfsent __P((const struct statfs *));
79
80/* From mount_ufs.c. */
81int	mount_ufs __P((int, char * const *));
82
83/* Map from mount otions to printable formats. */
84static struct opt {
85	int o_opt;
86	const char *o_name;
87} optnames[] = {
88	{ MNT_ASYNC,		"asynchronous" },
89	{ MNT_EXPORTED,		"NFS exported" },
90	{ MNT_LOCAL,		"local" },
91	{ MNT_NOATIME,		"noatime" },
92	{ MNT_NODEV,		"nodev" },
93	{ MNT_NOEXEC,		"noexec" },
94	{ MNT_NOSUID,		"nosuid" },
95	{ MNT_QUOTA,		"with quotas" },
96	{ MNT_RDONLY,		"read-only" },
97	{ MNT_SYNCHRONOUS,	"synchronous" },
98	{ MNT_UNION,		"union" },
99	{ MNT_USER,		"user mount" },
100	{ NULL }
101};
102
103int
104main(argc, argv)
105	int argc;
106	char * const argv[];
107{
108	const char *mntonname, **vfslist, *vfstype;
109	struct fstab *fs;
110	struct statfs *mntbuf;
111	FILE *mountdfp;
112	pid_t pid;
113	int all, ch, i, init_flags, mntsize, rval;
114	char *options;
115
116	all = init_flags = 0;
117	options = NULL;
118	vfslist = NULL;
119	vfstype = "ufs";
120	while ((ch = getopt(argc, argv, "padfo:rwt:uv")) != EOF)
121		switch (ch) {
122		case 'p':
123			fstab_style = 1;
124			verbose = 1;
125			break;
126		case 'a':
127			all = 1;
128			break;
129		case 'd':
130			debug = 1;
131			break;
132		case 'f':
133			init_flags |= MNT_FORCE;
134			break;
135		case 'o':
136			if (*optarg)
137				options = catopt(options, optarg);
138			break;
139		case 'r':
140			init_flags |= MNT_RDONLY;
141			break;
142		case 't':
143			if (vfslist != NULL)
144				errx(1, "only one -t option may be specified.");
145			vfslist = makevfslist(optarg);
146			vfstype = optarg;
147			break;
148		case 'u':
149			init_flags |= MNT_UPDATE;
150			break;
151		case 'v':
152			verbose = 1;
153			break;
154		case 'w':
155			init_flags &= ~MNT_RDONLY;
156			break;
157		case '?':
158		default:
159			usage();
160			/* NOTREACHED */
161		}
162	argc -= optind;
163	argv += optind;
164
165#define	BADTYPE(type)							\
166	(strcmp(type, FSTAB_RO) &&					\
167	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
168
169	rval = 0;
170	switch (argc) {
171	case 0:
172		if (all)
173			while ((fs = getfsent()) != NULL) {
174				if (BADTYPE(fs->fs_type))
175					continue;
176				if (badvfsname(fs->fs_vfstype, vfslist))
177					continue;
178				if (strstr(fs->fs_mntops, "noauto"))
179					continue;
180				if (mountfs(fs->fs_vfstype, fs->fs_spec,
181		    			fs->fs_file, init_flags, options,
182			    		fs->fs_mntops))
183						rval = 1;
184			}
185		else if (fstab_style) {
186			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
187				err(1, "getmntinfo");
188			for (i = 0; i < mntsize; i++) {
189				if (badvfstype(mntbuf[i].f_type, vfslist))
190					continue;
191				putfsent (&mntbuf[i]);
192			}
193		}
194		else {
195			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
196				err(1, "getmntinfo");
197			for (i = 0; i < mntsize; i++) {
198				if (badvfstype(mntbuf[i].f_type, vfslist))
199					continue;
200				prmount(mntbuf[i].f_mntfromname,
201				    mntbuf[i].f_mntonname, mntbuf[i].f_flags);
202			}
203		}
204		exit(rval);
205	case 1:
206		if (vfslist != NULL)
207			usage();
208
209		if (init_flags & MNT_UPDATE) {
210			if ((mntbuf = getmntpt(*argv)) == NULL)
211				errx(1,
212				    "unknown special file or file system %s.",
213				    *argv);
214			if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL)
215				errx(1, "can't find fstab entry for %s.",
216				    *argv);
217			/* If it's an update, ignore the fstab file options. */
218			fs->fs_mntops = NULL;
219			mntonname = mntbuf->f_mntonname;
220		} else {
221			if ((fs = getfsfile(*argv)) == NULL &&
222			    (fs = getfsspec(*argv)) == NULL)
223				errx(1,
224				    "%s: unknown special file or file system.",
225				    *argv);
226			if (BADTYPE(fs->fs_type))
227				errx(1, "%s has unknown file system type.",
228				    *argv);
229			mntonname = fs->fs_file;
230		}
231		rval = mountfs(fs->fs_vfstype, fs->fs_spec,
232		    mntonname, init_flags, options, fs->fs_mntops);
233		break;
234	case 2:
235		/*
236		 * If -t flag has not been specified, and spec contains either
237		 * a ':' or a '@' then assume that an NFS filesystem is being
238		 * specified ala Sun.
239		 */
240		if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL)
241			vfstype = "nfs";
242		rval = mountfs(vfstype,
243		    argv[0], argv[1], init_flags, options, NULL);
244		break;
245	default:
246		usage();
247		/* NOTREACHED */
248	}
249
250	/*
251	 * If the mount was successfully, and done by root, tell mountd the
252	 * good news.  Pid checks are probably unnecessary, but don't hurt.
253	 */
254	if (rval == 0 && getuid() == 0 &&
255	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
256		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
257		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
258			err(1, "signal mountd");
259		(void)fclose(mountdfp);
260	}
261
262	exit(rval);
263}
264
265int
266mountfs(vfstype, spec, name, flags, options, mntopts)
267	const char *vfstype, *spec, *name, *options, *mntopts;
268	int flags;
269{
270	struct stat sb;
271
272	/* List of directories containing mount_xxx subcommands. */
273	static const char *edirs[] = {
274		_PATH_SBIN,
275		_PATH_USRSBIN,
276		NULL
277	};
278	const char *argv[100], **edir;
279	struct statfs sf;
280	pid_t pid;
281	int argc, i, status;
282	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
283
284	if (realpath(name, mntpath) != NULL && stat(mntpath, &sb) == 0) {
285		if (!S_ISDIR(sb.st_mode)) {
286			warnx("%s: Not a directory", mntpath);
287			return (1);
288		}
289	} else {
290		warn("%s", mntpath);
291		return (1);
292	}
293
294	if (mntopts == NULL)
295		mntopts = "";
296
297	name = mntpath;
298
299	if (options == NULL) {
300		if (*mntopts == '\0')
301			options = "rw";
302		else
303			options = mntopts;
304		mntopts = "";
305	}
306	optbuf = catopt(strdup(mntopts), options);
307
308	if (strcmp(name, "/") == 0)
309		flags |= MNT_UPDATE;
310	if (flags & MNT_FORCE)
311		optbuf = catopt(optbuf, "force");
312	if (flags & MNT_RDONLY)
313		optbuf = catopt(optbuf, "ro");
314	/*
315	 * XXX
316	 * The mount_mfs (newfs) command uses -o to select the
317	 * optimisation mode.  We don't pass the default "-o rw"
318	 * for that reason.
319	 */
320	if (flags & MNT_UPDATE)
321		optbuf = catopt(optbuf, "update");
322
323	argc = 0;
324	argv[argc++] = vfstype;
325	mangle(optbuf, &argc, argv);
326	argv[argc++] = spec;
327	argv[argc++] = name;
328	argv[argc] = NULL;
329
330	if (debug) {
331		(void)printf("exec: mount_%s", vfstype);
332		for (i = 1; i < argc; i++)
333			(void)printf(" %s", argv[i]);
334		(void)printf("\n");
335		return (0);
336	}
337
338	switch (pid = vfork()) {
339	case -1:				/* Error. */
340		warn("vfork");
341		free(optbuf);
342		return (1);
343	case 0:					/* Child. */
344		if (strcmp(vfstype, "ufs") == 0)
345			exit(mount_ufs(argc, (char * const *) argv));
346
347		/* Go find an executable. */
348		for (edir = edirs; *edir; edir++) {
349			(void)snprintf(execname,
350			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
351			execv(execname, (char * const *)argv);
352		}
353		if (errno == ENOENT) {
354			int len = 0;
355			char *cp;
356			for (edir = edirs; *edir; edir++)
357				len += strlen(*edir) + 2;	/* ", " */
358			if ((cp = malloc(len)) == NULL) {
359				warn(NULL);
360				exit(1);
361			}
362			cp[0] = '\0';
363			for (edir = edirs; *edir; edir++) {
364				strcat(cp, *edir);
365				if (edir[1] != NULL)
366					strcat(cp, ", ");
367			}
368			warn("exec mount_%s not found in %s", vfstype, cp);
369		}
370		exit(1);
371		/* NOTREACHED */
372	default:				/* Parent. */
373		free(optbuf);
374
375		if (waitpid(pid, &status, 0) < 0) {
376			warn("waitpid");
377			return (1);
378		}
379
380		if (WIFEXITED(status)) {
381			if (WEXITSTATUS(status) != 0)
382				return (WEXITSTATUS(status));
383		} else if (WIFSIGNALED(status)) {
384			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
385			return (1);
386		}
387
388		if (verbose) {
389			if (statfs(name, &sf) < 0) {
390				warn("%s", name);
391				return (1);
392			}
393
394			if (fstab_style)
395			    putfsent (&sf);
396			else
397			    prmount (sf.f_mntfromname,
398				     sf.f_mntonname, sf.f_flags);
399		}
400		break;
401	}
402
403	return (0);
404}
405
406void
407prmount(spec, name, flags)
408	const char *spec, *name;
409	int flags;
410{
411	struct opt *o;
412	int f;
413
414	(void)printf("%s on %s", spec, name);
415
416	flags &= MNT_VISFLAGMASK;
417	for (f = 0, o = optnames; flags && o->o_opt; o++)
418		if (flags & o->o_opt) {
419			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
420			flags &= ~o->o_opt;
421		}
422	(void)printf(f ? ")\n" : "\n");
423}
424
425struct statfs *
426getmntpt(name)
427	const char *name;
428{
429	struct statfs *mntbuf;
430	int i, mntsize;
431
432	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
433	for (i = 0; i < mntsize; i++)
434		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
435		    strcmp(mntbuf[i].f_mntonname, name) == 0)
436			return (&mntbuf[i]);
437	return (NULL);
438}
439
440int
441badvfsname(vfsname, vfslist)
442	const char *vfsname;
443	const char **vfslist;
444{
445
446	if (vfslist == NULL)
447		return (0);
448	while (*vfslist != NULL) {
449		if (strcmp(vfsname, *vfslist) == 0)
450			return (skipvfs);
451		++vfslist;
452	}
453	return (!skipvfs);
454}
455
456int
457badvfstype(vfstype, vfslist)
458	int vfstype;
459	const char **vfslist;
460{
461	struct vfsconf *vfc;
462	vfc = getvfsbytype(vfstype);
463
464	if ( ! vfc )
465		return (0);
466
467	return (badvfsname(vfc->vfc_name, vfslist));
468}
469
470const char **
471makevfslist(fslist)
472	char *fslist;
473{
474	const char **av;
475	int i;
476	char *nextcp;
477
478	if (fslist == NULL)
479		return (NULL);
480	if (fslist[0] == 'n' && fslist[1] == 'o') {
481		fslist += 2;
482		skipvfs = 1;
483	}
484	for (i = 0, nextcp = fslist; *nextcp; nextcp++)
485		if (*nextcp == ',')
486			i++;
487	if ((av = malloc((size_t)(i + 2) * sizeof(char *))) == NULL) {
488		warn(NULL);
489		return (NULL);
490	}
491	nextcp = fslist;
492	i = 0;
493	av[i++] = nextcp;
494	while ((nextcp = strchr(nextcp, ',')) != NULL) {
495		*nextcp++ = '\0';
496		av[i++] = nextcp;
497	}
498	av[i++] = NULL;
499	return (av);
500}
501
502char *
503catopt(s0, s1)
504	char *s0;
505	const char *s1;
506{
507	size_t i;
508	char *cp;
509
510	if (s0 && *s0) {
511		i = strlen(s0) + strlen(s1) + 1 + 1;
512		if ((cp = malloc(i)) == NULL)
513			err(1, NULL);
514		(void)snprintf(cp, i, "%s,%s", s0, s1);
515	} else
516		cp = strdup(s1);
517
518	if (s0)
519		free(s0);
520	return (cp);
521}
522
523void
524mangle(options, argcp, argv)
525	char *options;
526	int *argcp;
527	const char **argv;
528{
529	char *p, *s;
530	int argc;
531
532	argc = *argcp;
533	for (s = options; (p = strsep(&s, ",")) != NULL;)
534		if (*p != '\0')
535			if (*p == '-') {
536				argv[argc++] = p;
537				p = strchr(p, '=');
538				if (p) {
539					*p = '\0';
540					argv[argc++] = p+1;
541				}
542			} else if (strcmp(p, "rw") != 0) {
543				argv[argc++] = "-o";
544				argv[argc++] = p;
545			}
546
547	*argcp = argc;
548}
549
550void
551usage()
552{
553
554	(void)fprintf(stderr,
555		"usage: mount %s %s\n       mount %s\n       mount %s\n",
556		"[-dfpruvw] [-o options] [-t ufs | external_type]",
557			"special node",
558		"[-adfpruvw] [-t ufs | external_type]",
559		"[-dfpruvw] special | node");
560	exit(1);
561}
562
563void
564putfsent (ent)
565    const struct statfs	    *ent;
566{
567    struct fstab    *fst;
568
569    printf ("%s\t%s\t%s %s",
570	    ent->f_mntfromname, ent->f_mntonname,
571	    mnttype[ent->f_type],
572	    (ent->f_flags & MNT_RDONLY) ? "ro" : "rw");
573
574    if (ent->f_flags & MNT_SYNCHRONOUS)
575	printf (",sync");
576
577    if (ent->f_flags & MNT_NOEXEC)
578	printf (",noexec");
579
580    if (ent->f_flags & MNT_NOSUID)
581	printf (",nosuid");
582
583    if (ent->f_flags & MNT_NODEV)
584	printf (",nodev");
585
586    if (ent->f_flags & MNT_UNION)
587	printf (",union");
588
589    if (ent->f_flags & MNT_ASYNC)
590	printf (",async");
591
592    if (fst = getfsspec (ent->f_mntfromname))
593	printf ("\t%u %u\n", fst->fs_freq, fst->fs_passno);
594    else if (fst = getfsfile (ent->f_mntonname))
595	printf ("\t%u %u\n", fst->fs_freq, fst->fs_passno);
596    else if (ent->f_type == MOUNT_UFS)
597	printf ("\t1 1\n");
598    else
599	printf ("\t0 0\n");
600}
601