1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/malloc.h>
33
34 #include <geom/geom.h>
35 #include <geom/geom_dbg.h>
36 #include <geom/label/g_label.h>
37
38 #define ISO9660_MAGIC "\x01" "CD001" "\x01\x00"
39 #define ISO9660_OFFSET 0x8000
40 #define VOLUME_LEN 32
41
42 static void
g_label_iso9660_taste(struct g_consumer * cp,char * label,size_t size)43 g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
44 {
45 struct g_provider *pp;
46 char *sector, *volume;
47
48 g_topology_assert_not();
49 pp = cp->provider;
50 label[0] = '\0';
51
52 KASSERT(pp->sectorsize != 0, ("Tasting a disk with 0 sectorsize"));
53 if (pp->sectorsize < 0x28 + VOLUME_LEN)
54 return;
55 if ((ISO9660_OFFSET % pp->sectorsize) != 0)
56 return;
57 sector = g_read_data(cp, ISO9660_OFFSET, pp->sectorsize, NULL);
58 if (sector == NULL)
59 return;
60 if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
61 g_free(sector);
62 return;
63 }
64 G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
65 volume = sector + 0x28;
66 bzero(label, size);
67 strlcpy(label, volume, MIN(size, VOLUME_LEN));
68 g_free(sector);
69 g_label_rtrim(label, size);
70 }
71
72 struct g_label_desc g_label_iso9660 = {
73 .ld_taste = g_label_iso9660_taste,
74 .ld_dirprefix = "iso9660/",
75 .ld_enabled = 1
76 };
77
78 G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names");
79