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/cdefs.h> 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/geom_dbg.h> 37 #include <geom/label/g_label.h> 38 39 #define ISO9660_MAGIC "\x01" "CD001" "\x01\x00" 40 #define ISO9660_OFFSET 0x8000 41 #define VOLUME_LEN 32 42 43 static void 44 g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size) 45 { 46 struct g_provider *pp; 47 char *sector, *volume; 48 49 g_topology_assert_not(); 50 pp = cp->provider; 51 label[0] = '\0'; 52 53 KASSERT(pp->sectorsize != 0, ("Tasting a disk with 0 sectorsize")); 54 if (pp->sectorsize < 0x28 + VOLUME_LEN) 55 return; 56 if ((ISO9660_OFFSET % pp->sectorsize) != 0) 57 return; 58 sector = g_read_data(cp, ISO9660_OFFSET, pp->sectorsize, 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 73 struct g_label_desc g_label_iso9660 = { 74 .ld_taste = g_label_iso9660_taste, 75 .ld_dirprefix = "iso9660/", 76 .ld_enabled = 1 77 }; 78 79 G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names"); 80