mount.c revision 1558 
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
48#include <err.h>
49#include <errno.h>
50#include <fstab.h>
51#include <signal.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56
57#include "pathnames.h"
58
59int debug, verbose, skipvfs;
60
61int	badvfsname __P((const char *, const char **));
62int	badvfstype __P((int, const char **));
63char   *catopt __P((char *, const char *));
64struct statfs
65       *getmntpt __P((const char *));
66const char
67      **makevfslist __P((char *));
68void	mangle __P((char *, int *, const char **));
69int	mountfs __P((const char *, const char *, const char *,
70			int, const char *, const char *));
71void	prmount __P((const char *, const char *, int));
72void	usage __P((void));
73
74/* From mount_ufs.c. */
75int	mount_ufs __P((int, char * const *));
76
77/* Map from mount otions to printable formats. */
78static struct opt {
79	int o_opt;
80	const char *o_name;
81} optnames[] = {
82	{ MNT_ASYNC,		"asynchronous" },
83	{ MNT_EXPORTED,		"NFS exported" },
84	{ MNT_LOCAL,		"local" },
85	{ MNT_NODEV,		"nodev" },
86	{ MNT_NOEXEC,		"noexec" },
87	{ MNT_NOSUID,		"nosuid" },
88	{ MNT_QUOTA,		"with quotas" },
89	{ MNT_RDONLY,		"read-only" },
90	{ MNT_SYNCHRONOUS,	"synchronous" },
91	{ MNT_UNION,		"union" },
92	{ MNT_USER,		"user mount" },
93	{ NULL }
94};
95
96int
97main(argc, argv)
98	int argc;
99	char * const argv[];
100{
101	const char *mntonname, **vfslist, *vfstype;
102	struct fstab *fs;
103	struct statfs *mntbuf;
104	FILE *mountdfp;
105	pid_t pid;
106	int all, ch, i, init_flags, mntsize, rval;
107	char *options;
108
109	all = init_flags = 0;
110	options = NULL;
111	vfslist = NULL;
112	vfstype = "ufs";
113	while ((ch = getopt(argc, argv, "adfo:rwt:uv")) != EOF)
114		switch (ch) {
115		case 'a':
116			all = 1;
117			break;
118		case 'd':
119			debug = 1;
120			break;
121		case 'f':
122			init_flags |= MNT_FORCE;
123			break;
124		case 'o':
125			if (*optarg)
126				options = catopt(options, optarg);
127			break;
128		case 'r':
129			init_flags |= MNT_RDONLY;
130			break;
131		case 't':
132			if (vfslist != NULL)
133				errx(1, "only one -t option may be specified.");
134			vfslist = makevfslist(optarg);
135			vfstype = optarg;
136			break;
137		case 'u':
138			init_flags |= MNT_UPDATE;
139			break;
140		case 'v':
141			verbose = 1;
142			break;
143		case 'w':
144			init_flags &= ~MNT_RDONLY;
145			break;
146		case '?':
147		default:
148			usage();
149			/* NOTREACHED */
150		}
151	argc -= optind;
152	argv += optind;
153
154#define	BADTYPE(type)							\
155	(strcmp(type, FSTAB_RO) &&					\
156	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
157
158	rval = 0;
159	switch (argc) {
160	case 0:
161		if (all)
162			while ((fs = getfsent()) != NULL) {
163				if (BADTYPE(fs->fs_type))
164					continue;
165				if (badvfsname(fs->fs_vfstype, vfslist))
166					continue;
167				if (mountfs(fs->fs_vfstype, fs->fs_spec,
168				    fs->fs_file, init_flags, options,
169				    fs->fs_mntops))
170					rval = 1;
171			}
172		else {
173			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
174				err(1, "getmntinfo");
175			for (i = 0; i < mntsize; i++) {
176				if (badvfstype(mntbuf[i].f_type, vfslist))
177					continue;
178				prmount(mntbuf[i].f_mntfromname,
179				    mntbuf[i].f_mntonname, mntbuf[i].f_flags);
180			}
181		}
182		exit(rval);
183	case 1:
184		if (vfslist != NULL)
185			usage();
186
187		if (init_flags & MNT_UPDATE) {
188			if ((mntbuf = getmntpt(*argv)) == NULL)
189				errx(1,
190				    "unknown special file or file system %s.",
191				    *argv);
192			if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL)
193				errx(1, "can't find fstab entry for %s.",
194				    *argv);
195			/* If it's an update, ignore the fstab file options. */
196			fs->fs_mntops = NULL;
197			mntonname = mntbuf->f_mntonname;
198		} else {
199			if ((fs = getfsfile(*argv)) == NULL &&
200			    (fs = getfsspec(*argv)) == NULL)
201				errx(1,
202				    "%s: unknown special file or file system.",
203				    *argv);
204			if (BADTYPE(fs->fs_type))
205				errx(1, "%s has unknown file system type.",
206				    *argv);
207			mntonname = fs->fs_file;
208		}
209		rval = mountfs(fs->fs_vfstype, fs->fs_spec,
210		    mntonname, init_flags, options, fs->fs_mntops);
211		break;
212	case 2:
213		/*
214		 * If -t flag has not been specified, and spec contains either
215		 * a ':' or a '@' then assume that an NFS filesystem is being
216		 * specified ala Sun.
217		 */
218		if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL)
219			vfstype = "nfs";
220		rval = mountfs(vfstype,
221		    argv[0], argv[1], init_flags, options, NULL);
222		break;
223	default:
224		usage();
225		/* NOTREACHED */
226	}
227
228	/*
229	 * If the mount was successfully, and done by root, tell mountd the
230	 * good news.  Pid checks are probably unnecessary, but don't hurt.
231	 */
232	if (rval == 0 && getuid() == 0 &&
233	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
234		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
235		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
236			err(1, "signal mountd");
237		(void)fclose(mountdfp);
238	}
239
240	exit(rval);
241}
242
243int
244mountfs(vfstype, spec, name, flags, options, mntopts)
245	const char *vfstype, *spec, *name, *options, *mntopts;
246	int flags;
247{
248	/* List of directories containing mount_xxx subcommands. */
249	static const char *edirs[] = {
250		_PATH_SBIN,
251		_PATH_USRSBIN,
252		NULL
253	};
254	const char *argv[100], **edir;
255	struct statfs sf;
256	pid_t pid;
257	int argc, i, status;
258	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
259
260	if (realpath(name, mntpath) == NULL) {
261		warn("%s", mntpath);
262		return (1);
263	}
264
265	name = mntpath;
266
267	if (options == NULL) {
268		if (mntopts == NULL || *mntopts == '\0')
269			options = "rw";
270		else
271			options = mntopts;
272		mntopts = "";
273	}
274	optbuf = catopt(strdup(mntopts), options);
275
276	if (strcmp(name, "/") == 0)
277		flags |= MNT_UPDATE;
278	if (flags & MNT_FORCE)
279		optbuf = catopt(optbuf, "force");
280	if (flags & MNT_RDONLY)
281		optbuf = catopt(optbuf, "ro");
282	/*
283	 * XXX
284	 * The mount_mfs (newfs) command uses -o to select the
285	 * optimisation mode.  We don't pass the default "-o rw"
286	 * for that reason.
287	 */
288	if (flags & MNT_UPDATE)
289		optbuf = catopt(optbuf, "update");
290
291	argc = 0;
292	argv[argc++] = vfstype;
293	mangle(optbuf, &argc, argv);
294	argv[argc++] = spec;
295	argv[argc++] = name;
296	argv[argc] = NULL;
297
298	if (debug) {
299		(void)printf("exec: mount_%s", vfstype);
300		for (i = 1; i < argc; i++)
301			(void)printf(" %s", argv[i]);
302		(void)printf("\n");
303		return (0);
304	}
305
306	switch (pid = vfork()) {
307	case -1:				/* Error. */
308		warn("vfork");
309		free(optbuf);
310		return (1);
311	case 0:					/* Child. */
312		if (strcmp(vfstype, "ufs") == 0)
313			exit(mount_ufs(argc, (char * const *) argv));
314
315		/* Go find an executable. */
316		edir = edirs;
317		do {
318			(void)snprintf(execname,
319			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
320			execv(execname, (char * const *)argv);
321			if (errno != ENOENT)
322				warn("exec %s for %s", execname, name);
323		} while (*++edir != NULL);
324
325		if (errno == ENOENT)
326			warn("exec %s for %s", execname, name);
327		exit(1);
328		/* NOTREACHED */
329	default:				/* Parent. */
330		free(optbuf);
331
332		if (waitpid(pid, &status, 0) < 0) {
333			warn("waitpid");
334			return (1);
335		}
336
337		if (WIFEXITED(status)) {
338			if (WEXITSTATUS(status) != 0)
339				return (WEXITSTATUS(status));
340		} else if (WIFSIGNALED(status)) {
341			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
342			return (1);
343		}
344
345		if (verbose) {
346			if (statfs(name, &sf) < 0) {
347				warn("%s", name);
348				return (1);
349			}
350			prmount(sf.f_mntfromname, sf.f_mntonname, sf.f_flags);
351		}
352		break;
353	}
354
355	return (0);
356}
357
358void
359prmount(spec, name, flags)
360	const char *spec, *name;
361	int flags;
362{
363	struct opt *o;
364	int f;
365
366	(void)printf("%s on %s", spec, name);
367
368	flags &= MNT_VISFLAGMASK;
369	for (f = 0, o = optnames; flags && o->o_opt; o++)
370		if (flags & o->o_opt) {
371			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
372			flags &= ~o->o_opt;
373		}
374	(void)printf(f ? ")\n" : "\n");
375}
376
377struct statfs *
378getmntpt(name)
379	const char *name;
380{
381	struct statfs *mntbuf;
382	int i, mntsize;
383
384	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
385	for (i = 0; i < mntsize; i++)
386		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
387		    strcmp(mntbuf[i].f_mntonname, name) == 0)
388			return (&mntbuf[i]);
389	return (NULL);
390}
391
392int
393badvfsname(vfsname, vfslist)
394	const char *vfsname;
395	const char **vfslist;
396{
397
398	if (vfslist == NULL)
399		return (0);
400	while (*vfslist != NULL) {
401		if (strcmp(vfsname, *vfslist) == 0)
402			return (skipvfs);
403		++vfslist;
404	}
405	return (!skipvfs);
406}
407
408int
409badvfstype(vfstype, vfslist)
410	int vfstype;
411	const char **vfslist;
412{
413static const char *vfsnames[] = INITMOUNTNAMES;
414
415	if ((vfstype < 0) || (vfstype > MOUNT_MAXTYPE))
416		return (0);
417
418	return (badvfsname(vfsnames[vfstype], vfslist));
419}
420
421const char **
422makevfslist(fslist)
423	char *fslist;
424{
425	const char **av;
426	int i;
427	char *nextcp;
428
429	if (fslist == NULL)
430		return (NULL);
431	if (fslist[0] == 'n' && fslist[1] == 'o') {
432		fslist += 2;
433		skipvfs = 1;
434	}
435	for (i = 0, nextcp = fslist; *nextcp; nextcp++)
436		if (*nextcp == ',')
437			i++;
438	if ((av = malloc((size_t)(i + 2) * sizeof(char *))) == NULL) {
439		warn(NULL);
440		return (NULL);
441	}
442	nextcp = fslist;
443	i = 0;
444	av[i++] = nextcp;
445	while ((nextcp = strchr(nextcp, ',')) != NULL) {
446		*nextcp++ = '\0';
447		av[i++] = nextcp;
448	}
449	av[i++] = NULL;
450	return (av);
451}
452
453char *
454catopt(s0, s1)
455	char *s0;
456	const char *s1;
457{
458	size_t i;
459	char *cp;
460
461	if (s0 && *s0) {
462		i = strlen(s0) + strlen(s1) + 1 + 1;
463		if ((cp = malloc(i)) == NULL)
464			err(1, NULL);
465		(void)snprintf(cp, i, "%s,%s", s0, s1);
466	} else
467		cp = strdup(s1);
468
469	if (s0)
470		free(s0);
471	return (cp);
472}
473
474void
475mangle(options, argcp, argv)
476	char *options;
477	int *argcp;
478	const char **argv;
479{
480	char *p, *s;
481	int argc;
482
483	argc = *argcp;
484	for (s = options; (p = strsep(&s, ",")) != NULL;)
485		if (*p != '\0')
486			if (*p == '-') {
487				argv[argc++] = p;
488				p = strchr(p, '=');
489				if (p) {
490					*p = '\0';
491					argv[argc++] = p+1;
492				}
493			} else if (strcmp(p, "rw") != 0) {
494				argv[argc++] = "-o";
495				argv[argc++] = p;
496			}
497
498	*argcp = argc;
499}
500
501void
502usage()
503{
504
505	(void)fprintf(stderr,
506		"usage: mount %s %s\n       mount %s\n       mount %s\n",
507		"[-dfruvw] [-o options] [-t ufs | external_type]",
508			"special node",
509		"[-adfruvw] [-t ufs | external_type]",
510		"[-dfruvw] special | node");
511	exit(1);
512}
513