1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/malloc.h>
36
37#include <geom/geom.h>
38#include <geom/label/g_label.h>
39
40#define G_LABEL_ISO9660_DIR	"iso9660"
41
42#define	ISO9660_MAGIC	"\x01" "CD001" "\x01\x00"
43#define	ISO9660_OFFSET	0x8000
44#define	VOLUME_LEN	32
45
46
47static void
48g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
49{
50	struct g_provider *pp;
51	char *sector, *volume;
52
53	g_topology_assert_not();
54	pp = cp->provider;
55	label[0] = '\0';
56
57	if ((ISO9660_OFFSET % pp->sectorsize) != 0)
58		return;
59	sector = (char *)g_read_data(cp, ISO9660_OFFSET, pp->sectorsize,
60	    NULL);
61	if (sector == NULL)
62		return;
63	if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
64		g_free(sector);
65		return;
66	}
67	G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
68	volume = sector + 0x28;
69	bzero(label, size);
70	strlcpy(label, volume, MIN(size, VOLUME_LEN));
71	g_free(sector);
72	g_label_rtrim(label, size);
73}
74
75struct g_label_desc g_label_iso9660 = {
76	.ld_taste = g_label_iso9660_taste,
77	.ld_dir = G_LABEL_ISO9660_DIR,
78	.ld_enabled = 1
79};
80
81G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names");
82