g_label_iso9660.c revision 286193 
1/*-
2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/sys/geom/label/g_label_iso9660.c 286193 2015-08-02 10:08:57Z trasz $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/malloc.h>
34
35#include <geom/geom.h>
36#include <geom/label/g_label.h>
37
38#define G_LABEL_ISO9660_DIR	"iso9660"
39
40#define	ISO9660_MAGIC	"\x01" "CD001" "\x01\x00"
41#define	ISO9660_OFFSET	0x8000
42#define	VOLUME_LEN	32
43
44
45static void
46g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
47{
48	struct g_provider *pp;
49	char *sector, *volume;
50
51	g_topology_assert_not();
52	pp = cp->provider;
53	label[0] = '\0';
54
55	if ((ISO9660_OFFSET % pp->sectorsize) != 0)
56		return;
57	sector = (char *)g_read_data(cp, ISO9660_OFFSET, pp->sectorsize,
58	    NULL);
59	if (sector == NULL)
60		return;
61	if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
62		g_free(sector);
63		return;
64	}
65	G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
66	volume = sector + 0x28;
67	bzero(label, size);
68	strlcpy(label, volume, MIN(size, VOLUME_LEN));
69	g_free(sector);
70	g_label_rtrim(label, size);
71}
72
73struct g_label_desc g_label_iso9660 = {
74	.ld_taste = g_label_iso9660_taste,
75	.ld_dir = G_LABEL_ISO9660_DIR,
76	.ld_enabled = 1
77};
78
79G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names");
80