HardenedBSD/sbin/mount_cd9660/mount_cd9660.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 *      @(#)mount_cd9660.c	8.7 (Berkeley) 5/1/95
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1992, 1993, 1994\n\
        The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/*
static char sccsid[] = "@(#)mount_cd9660.c	8.7 (Berkeley) 5/1/95";
*/
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

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

#include <arpa/inet.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
};

static int	get_ssector(const char *dev);
static int	set_charset(struct iovec **, int *iovlen, const char *);
void	usage(void);

int
main(int argc, char **argv)
{
	struct iovec *iov;
	int iovlen;
	int ch, mntflags;
	char *dev, *dir, *p, *val, mntpath[MAXPATHLEN];
	int verbose;
	int ssector;		/* starting sector, 0 for 1st session */
	char fstype[] = "cd9660";

	iov = NULL;
	iovlen = 0;
	mntflags = verbose = 0;
	ssector = -1;

	while ((ch = getopt(argc, argv, "begjo:rs:vC:")) != -1)
		switch (ch) {
		case 'b':
			build_iovec(&iov, &iovlen, "brokenjoliet", NULL, (size_t)-1);
			break;
		case 'e':
			build_iovec(&iov, &iovlen, "extatt", NULL, (size_t)-1);
			break;
		case 'g':
			build_iovec(&iov, &iovlen, "gens", NULL, (size_t)-1);
			break;
		case 'j':
			build_iovec(&iov, &iovlen, "nojoliet", NULL, (size_t)-1);
			break;
		case 'o':
			getmntopts(optarg, mopts, &mntflags, NULL);
			p = strchr(optarg, '=');
			val = NULL;
			if (p != NULL) {
				*p = '\0';
				val = p + 1;
			}
			build_iovec(&iov, &iovlen, optarg, val, (size_t)-1);
			break;
		case 'r':
			build_iovec(&iov, &iovlen, "norrip", NULL, (size_t)-1);
			break;
		case 's':
			ssector = atoi(optarg);
			break;
		case 'v':
			verbose++;
			break;
		case 'C':
			if (set_charset(&iov, &iovlen, optarg) == -1)
				err(EX_OSERR, "cd9660_iconv");
			build_iovec(&iov, &iovlen, "kiconv", NULL, (size_t)-1);
			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(1, "%s", mntpath);
	(void)rmslashes(dev, dev);

	if (ssector == -1) {
		/*
		 * The start of the session has not been specified on
		 * the command line.  If we can successfully read the
		 * TOC of a CD-ROM, use the last data track we find.
		 * Otherwise, just use 0, in order to mount the very
		 * first session.  This is compatible with the
		 * historic behaviour of mount_cd9660(8).  If the user
		 * has specified -s <ssector> above, we don't get here
		 * and leave the user's will.
		 */
		if ((ssector = get_ssector(dev)) == -1) {
			if (verbose)
				printf("could not determine starting sector, "
				       "using very first session\n");
			ssector = 0;
		} else if (verbose)
			printf("using starting sector %d\n", ssector);
	}
	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_argf(&iov, &iovlen, "ssector", "%d", ssector);

	if (nmount(iov, iovlen, mntflags) < 0)
		err(1, "%s", dev);
	exit(0);
}

void
usage(void)
{
	(void)fprintf(stderr,
"usage: mount_cd9660 [-begjrv] [-C charset] [-o options] [-s startsector]\n"
"                    special node\n");
	exit(EX_USAGE);
}

static int
get_ssector(const char *dev)
{
	struct ioc_toc_header h;
	struct ioc_read_toc_entry t;
	struct cd_toc_entry toc_buffer[100];
	int fd, ntocentries, i;

	if ((fd = open(dev, O_RDONLY)) == -1)
		return -1;
	if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) {
		close(fd);
		return -1;
	}

	ntocentries = h.ending_track - h.starting_track + 1;
	if (ntocentries > 100) {
		/* unreasonable, only 100 allowed */
		close(fd);
		return -1;
	}
	t.address_format = CD_LBA_FORMAT;
	t.starting_track = 0;
	t.data_len = ntocentries * sizeof(struct cd_toc_entry);
	t.data = toc_buffer;

	if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) {
		close(fd);
		return -1;
	}
	close(fd);
	
	for (i = ntocentries - 1; i >= 0; i--)
		if ((toc_buffer[i].control & 4) != 0)
			/* found a data track */
			break;
	if (i < 0)
		return -1;

	return ntohl(toc_buffer[i].addr.lba);
}

static int
set_charset(struct iovec **iov, int *iovlen, const char *localcs)
{
	int error;
	char *cs_disk;	/* disk charset for Joliet cs conversion */
	char *cs_local;	/* local charset for Joliet cs conversion */

	cs_disk = NULL;
	cs_local = NULL;

	if (modfind("cd9660_iconv") < 0)
		if (kldload("cd9660_iconv") < 0 || modfind("cd9660_iconv") < 0) {
			warnx( "cannot find or load \"cd9660_iconv\" kernel module");
			return (-1);
		}

	if ((cs_disk = malloc(ICONV_CSNMAXLEN)) == NULL)
		return (-1);
	if ((cs_local = malloc(ICONV_CSNMAXLEN)) == NULL) {
		free(cs_disk);
		return (-1);
	}
	strncpy(cs_disk, ENCODING_UNICODE, ICONV_CSNMAXLEN);
	strncpy(cs_local, kiconv_quirkcs(localcs, KICONV_VENDOR_MICSFT),
	    ICONV_CSNMAXLEN);
	error = kiconv_add_xlat16_cspairs(cs_disk, cs_local);
	if (error)
		return (-1);
	
	build_iovec(iov, iovlen, "cs_disk", cs_disk, (size_t)-1);
	build_iovec(iov, iovlen, "cs_local", cs_local, (size_t)-1);

	return (0);
}