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: releng/10.0/sys/geom/label/g_label_iso9660.c 199875 2009-11-28 11:57:43Z 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
45 static void
46 g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
47 {
48 struct g_provider *pp;
49 char *sector, *volume;
50 int i;
51
52 g_topology_assert_not();
53 pp = cp->provider;
54 label[0] = '\0';
55
56 if ((ISO9660_OFFSET % pp->sectorsize) != 0)
57 return;
58 sector = (char *)g_read_data(cp, ISO9660_OFFSET, pp->sectorsize,
59 NULL);
60 if (sector == NULL)
61 return;
62 if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
63 g_free(sector);
64 return;
65 }
66 G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
67 volume = sector + 0x28;
68 bzero(label, size);
69 strlcpy(label, volume, MIN(size, VOLUME_LEN));
70 g_free(sector);
71 for (i = size - 1; i > 0; i--) {
72 if (label[i] == '\0')
73 continue;
74 else if (label[i] == ' ')
75 label[i] = '\0';
76 else
77 break;
78 }
79 }
80
81 struct g_label_desc g_label_iso9660 = {
82 .ld_taste = g_label_iso9660_taste,
83 .ld_dir = G_LABEL_ISO9660_DIR,
84 .ld_enabled = 1
85 };
86
87 G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names");
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