mount_autofs.c revision 1.1 
1/*	$NetBSD: mount_autofs.c,v 1.1 2018/01/14 22:44:04 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31#include <sys/cdefs.h>
32#ifndef lint
33__RCSID("$NetBSD: mount_autofs.c,v 1.1 2018/01/14 22:44:04 christos Exp $");
34#endif /* not lint */
35
36#include <sys/param.h>
37#include <sys/mount.h>
38
39#include <err.h>
40#include <unistd.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44
45#include <mntopts.h>
46
47#include <fs/autofs/autofs_mount.h>
48
49#include "mount_autofs.h"
50
51static const struct mntopt mopts[] = {
52	MOPT_STDOPTS,
53	MOPT_GETARGS,
54	MOPT_NULL,
55};
56
57int	mount_autofs(int argc, char **argv);
58__dead static void	usage(void);
59
60#ifndef MOUNT_NOMAIN
61int
62main(int argc, char **argv)
63{
64	return mount_autofs(argc, argv);
65}
66#endif
67
68void
69mount_autofs_parseargs(int argc, char *argv[], void *v, int *mntflags,
70	char *canon_dev, char *canon_dir)
71{
72	int ch;
73	mntoptparse_t mp;
74	struct autofs_args *am = v;
75
76	*mntflags = 0;
77	while ((ch = getopt(argc, argv, "f:o:O:p:")) != -1)
78		switch (ch) {
79		case 'f':
80			strlcpy(am->from, optarg, MAXPATHLEN);
81			break;
82		case 'o':
83			mp = getmntopts(optarg, mopts, mntflags, 0);
84			if (mp == NULL)
85				err(EXIT_FAILURE, "getmntopts");
86			freemntopts(mp);
87			break;
88		case 'O':
89			strlcpy(am->master_options, optarg, MAXPATHLEN);
90			break;
91		case 'p':
92			strlcpy(am->master_prefix, optarg, MAXPATHLEN);
93			break;
94
95		case '?':
96		default:
97			usage();
98		}
99	argc -= optind;
100	argv += optind;
101
102	if (argc != 2)
103		usage();
104
105	strlcpy(canon_dev, argv[0], MAXPATHLEN);
106	if (realpath(argv[1], canon_dir) == NULL)    /* Check mounton path */
107		err(EXIT_FAILURE, "realpath %s", canon_dir);
108	if (strncmp(argv[1], canon_dir, MAXPATHLEN)) {
109		warnx("\"%s\" is a relative path.", argv[1]);
110		warnx("using \"%s\" instead.", canon_dir);
111	}
112}
113
114int
115mount_autofs(int argc, char *argv[])
116{
117	char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
118	char from[MAXPATHLEN], master_options[MAXPATHLEN];
119	char master_prefix[MAXPATHLEN];
120	int mntflags;
121	struct autofs_args am = {
122		.from = from,
123		.master_options = master_options,
124		.master_prefix = master_prefix,
125	};
126
127	mount_autofs_parseargs(argc, argv, &am, &mntflags,
128	    canon_dev, canon_dir);
129	if (mount(MOUNT_KERNFS, canon_dir, mntflags, &am, sizeof(am)) == -1)
130		err(EXIT_FAILURE, "kernfs on %s", canon_dir);
131        if (mntflags & MNT_GETARGS) {
132		printf("from=%s, master_options=%s, master_prefix=%s\n",
133		    am.from, am.master_options, am.master_prefix);
134	}
135
136	return EXIT_SUCCESS;
137}
138
139static void
140usage(void)
141{
142	(void)fprintf(stderr,
143	    "Usage: %s [-o options] [-O autofs_options] [-p <prefix>] "
144		"[-f <from>] autofs mount_point\n", getprogname());
145	exit(EXIT_FAILURE);
146}
147