HardenedBSD/sbin/mount_udf/mount_udf.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2002 Scott Long
 *
 * This code is derived from software contributed to Berkeley
 * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
 * Support code is derived from software contributed to Berkeley
 * by Atsushi Murai (amurai@spec.co.jp).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * This is just a rip-off of mount_iso9660.c.  It's been vastly simplified
 * because UDF doesn't take any options at this time.
 */

#include <sys/cdio.h>
#include <sys/file.h>
#include <sys/iconv.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/uio.h>

#include <fs/udf/udf_mount.h>

#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#include "mntopts.h"

static struct mntopt mopts[] = {
	MOPT_STDOPTS,
	MOPT_UPDATE,
	MOPT_END
};

int	set_charset(char **, char **, const char *);
void	usage(void);

int
main(int argc, char **argv)
{
	char mntpath[MAXPATHLEN];
	char fstype[] = "udf";
	struct iovec *iov;
	char *cs_disk, *cs_local, *dev, *dir;
	int ch, iovlen, mntflags, udf_flags, verbose;

	iovlen = mntflags = udf_flags = verbose = 0;
	cs_disk = cs_local = NULL;
	iov = NULL;
	while ((ch = getopt(argc, argv, "o:vC:")) != -1)
		switch (ch) {
		case 'o':
			getmntopts(optarg, mopts, &mntflags, NULL);
			break;
		case 'v':
			verbose++;
			break;
		case 'C':
			if (set_charset(&cs_disk, &cs_local, optarg) == -1)
				err(EX_OSERR, "udf_iconv");
			udf_flags |= UDFMNT_KICONV;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc != 2)
		usage();

	dev = argv[0];
	dir = argv[1];

	/*
	 * Resolve the mountpoint with realpath(3) and remove unnecessary
	 * slashes from the devicename if there are any.
	 */
	if (checkpath(dir, mntpath) != 0)
		err(EX_USAGE, "%s", mntpath);
	(void)rmslashes(dev, dev);

	/*
	 * UDF file systems are not writeable.
	 */
	mntflags |= MNT_RDONLY;

	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
	build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
	build_iovec(&iov, &iovlen, "from", dev, (size_t)-1);
	build_iovec(&iov, &iovlen, "flags", &udf_flags, sizeof(udf_flags));
	if (udf_flags & UDFMNT_KICONV) {
		build_iovec(&iov, &iovlen, "cs_disk", cs_disk, (size_t)-1);
		build_iovec(&iov, &iovlen, "cs_local", cs_local, (size_t)-1);
	}
	if (nmount(iov, iovlen, mntflags) < 0)
		err(1, "%s", dev);
	exit(0);
}

int
set_charset(char **cs_disk, char **cs_local, const char *localcs)
{
	int error;

	if (modfind("udf_iconv") < 0)
		if (kldload("udf_iconv") < 0 || modfind("udf_iconv") < 0) {
			warnx( "cannot find or load \"udf_iconv\" kernel module");
			return (-1);
		}

	if ((*cs_disk = malloc(ICONV_CSNMAXLEN)) == NULL)
		return (-1);
	if ((*cs_local = malloc(ICONV_CSNMAXLEN)) == NULL)
		return (-1);
	strncpy(*cs_disk, ENCODING_UNICODE, ICONV_CSNMAXLEN);
	strncpy(*cs_local, localcs, ICONV_CSNMAXLEN);
	error = kiconv_add_xlat16_cspairs(*cs_disk, *cs_local);
	if (error)
		return (-1);

	return (0);
}

void
usage(void)
{
	(void)fprintf(stderr,
		"usage: mount_udf [-v] [-o options] [-C charset] special node\n");
	exit(EX_USAGE);
}