1/*
2 * Copyright (c) 1990, 1992 Jan-Simon Pendry
3 * Copyright (c) 1992, 1993, 1994
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Jan-Simon Pendry.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
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) 1992, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD$");
42
43#include <sys/param.h>
44#include <sys/mount.h>
45#include <sys/uio.h>
46
47#include <err.h>
48#include <errno.h>
49#include <stdio.h>
50#include <signal.h>
51#include <stdlib.h>
52#include <string.h>
53#include <sysexits.h>
54#include <unistd.h>
55
56#include "mntopts.h"
57
58static struct mntopt mopts[] = {
59	MOPT_STDOPTS,
60	MOPT_END
61};
62
63static char *fsname;
64static volatile sig_atomic_t caughtsig;
65
66static void usage(void) __dead2;
67
68static void
69catchsig(int s __unused)
70{
71	caughtsig = 1;
72}
73
74int
75main(int argc, char *argv[])
76{
77	int ch, mntflags;
78	char mntpath[MAXPATHLEN];
79	struct iovec iov[4];
80	int error;
81
82	/*
83	 * XXX
84	 * mount(8) calls the mount programs with an argv[0] which is
85	 * /just/ the file system name.  So, if there is no underscore
86	 * in argv[0], we assume that we are being called from mount(8)
87	 * and that argv[0] is thus the name of the file system type.
88	 */
89	fsname = strrchr(argv[0], '_');
90	if (fsname) {
91		if (strcmp(fsname, "_std") == 0)
92			errx(EX_USAGE, "argv[0] must end in _fsname");
93		fsname++;
94	} else {
95		fsname = argv[0];
96	}
97
98	mntflags = 0;
99	while ((ch = getopt(argc, argv, "o:")) != -1)
100		switch (ch) {
101		case 'o':
102			getmntopts(optarg, mopts, &mntflags, 0);
103			break;
104		case '?':
105		default:
106			usage();
107		}
108	argc -= optind;
109	argv += optind;
110
111	if (argc != 2)
112		usage();
113
114	/* resolve the mountpoint with realpath(3) */
115	(void)checkpath(argv[1], mntpath);
116
117	iov[0].iov_base = "fstype";
118	iov[0].iov_len = sizeof("fstype");
119	iov[1].iov_base = fsname;
120	iov[1].iov_len = strlen(iov[1].iov_base) + 1;
121	iov[2].iov_base = "fspath";
122	iov[2].iov_len = sizeof("fspath");
123	iov[3].iov_base = mntpath;
124	iov[3].iov_len = strlen(mntpath) + 1;
125
126	/*
127	 * nmount(2) would kill us with SIGSYS if the kernel doesn't have it.
128	 * This design bug is inconvenient.  We must catch the signal and not
129	 * just ignore it because of a plain bug: nmount(2) would return
130	 * EINVAL instead of the correct ENOSYS if the kernel doesn't have it
131	 * and we don't let the signal kill us.  EINVAL is too ambiguous.
132	 * This bug in 4.4BSD-Lite1 was fixed in 4.4BSD-Lite2 but is still in
133	 * FreeBSD-5.0.
134	 */
135	signal(SIGSYS, catchsig);
136	error = nmount(iov, 4, mntflags);
137	signal(SIGSYS, SIG_DFL);
138
139	/*
140	 * Try with the old mount syscall in the case
141	 * this file system has not been converted yet,
142	 * or the user didn't recompile his kernel.
143	 */
144	if (error && (errno == EOPNOTSUPP || errno == ENOSYS || caughtsig))
145		error = mount(fsname, mntpath, mntflags, NULL);
146
147	if (error)
148		err(EX_OSERR, NULL);
149	exit(0);
150}
151
152void
153usage(void)
154{
155	(void)fprintf(stderr,
156		"usage: mount_%s [-o options] what_to_mount mount_point\n",
157		      fsname);
158	exit(EX_USAGE);
159}
160