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/geom_dbg.h> 39 #include <geom/label/g_label.h> 40 41 #define G_LABEL_ISO9660_DIR "iso9660" 42 43 #define ISO9660_MAGIC "\x01" "CD001" "\x01\x00" 44 #define ISO9660_OFFSET 0x8000 45 #define VOLUME_LEN 32 46 47 48 static void 49 g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size) 50 { 51 struct g_provider *pp; 52 char *sector, *volume; 53 54 g_topology_assert_not(); 55 pp = cp->provider; 56 label[0] = '\0'; 57 58 if ((ISO9660_OFFSET % pp->sectorsize) != 0) 59 return; 60 sector = (char *)g_read_data(cp, ISO9660_OFFSET, pp->sectorsize, 61 NULL); 62 if (sector == NULL) 63 return; 64 if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) { 65 g_free(sector); 66 return; 67 } 68 G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name); 69 volume = sector + 0x28; 70 bzero(label, size); 71 strlcpy(label, volume, MIN(size, VOLUME_LEN)); 72 g_free(sector); 73 g_label_rtrim(label, size); 74 } 75 76 struct g_label_desc g_label_iso9660 = { 77 .ld_taste = g_label_iso9660_taste, 78 .ld_dir = G_LABEL_ISO9660_DIR, 79 .ld_enabled = 1 80 }; 81 82 G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names"); 83