1 /* $NetBSD: cd9660.c,v 1.2 2024/05/24 09:59:42 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 Izumi Tsutsui. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #if HAVE_NBTOOL_CONFIG_H 28 #include "nbtool_config.h" 29 #endif 30 31 #include <sys/cdefs.h> 32 #if defined(__RCSID) && !defined(__lint) 33 __RCSID("$NetBSD: cd9660.c,v 1.2 2024/05/24 09:59:42 tsutsui Exp $"); 34 #endif /* !__lint */ 35 36 #include <sys/param.h> 37 38 #if !HAVE_NBTOOL_CONFIG_H 39 #include <sys/mount.h> 40 #endif 41 #if !HAVE_NBTOOL_CONFIG_H || HAVE_SYS_ENDIAN_H 42 #include <sys/endian.h> 43 #endif 44 45 #include <assert.h> 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <stdarg.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <dirent.h> 55 56 #include <fs/cd9660/iso.h> 57 #include <fs/cd9660/cd9660_extern.h> 58 59 #include "installboot.h" 60 61 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 62 #define MAXLEN 16 63 64 65 int 66 cd9660_match(ib_params *params) 67 { 68 int rv, blocksize; 69 struct iso_primary_descriptor ipd; 70 71 assert(params != NULL); 72 assert(params->fstype != NULL); 73 assert(params->fsfd != -1); 74 75 rv = pread(params->fsfd, &ipd, sizeof(ipd), 76 ISO_DEFAULT_BLOCK_SIZE * 16); 77 if (rv == -1) { 78 warn("Reading primary descriptor in `%s'", params->filesystem); 79 return 0; 80 } else if (rv != sizeof(ipd)) { 81 warnx("Reading primary descriptor in `%s': short read", 82 params->filesystem); 83 return 0; 84 } 85 86 if (ipd.type[0] != ISO_VD_PRIMARY || 87 strncmp(ipd.id, ISO_STANDARD_ID, sizeof(ipd.id)) != 0 || 88 ipd.version[0] != 1) { 89 warnx("Filesystem `%s' is not ISO9660 format", 90 params->filesystem); 91 return 0; 92 } 93 94 blocksize = isonum_723((u_char *)ipd.logical_block_size); 95 if (blocksize != ISO_DEFAULT_BLOCK_SIZE) { 96 warnx("Invalid blocksize %d in `%s'", 97 blocksize, params->filesystem); 98 return 0; 99 } 100 101 params->fstype->blocksize = blocksize; 102 params->fstype->needswap = 0; 103 104 return 1; 105 } 106 107 int 108 cd9660_findstage2(ib_params *params, uint32_t *maxblk, ib_block *blocks) 109 { 110 uint8_t buf[ISO_DEFAULT_BLOCK_SIZE]; 111 char name[ISO_MAXNAMLEN]; 112 char *stage2; 113 off_t loc; 114 int rv, blocksize, found; 115 u_int i; 116 struct iso_primary_descriptor ipd; 117 struct iso_directory_record *idr; 118 119 assert(params != NULL); 120 assert(params->stage2 != NULL); 121 assert(maxblk != NULL); 122 assert(blocks != NULL); 123 124 #if 0 125 if (params->flags & IB_STAGE2START) 126 return hardcode_stage2(params, maxblk, blocks); 127 #endif 128 129 /* The secondary bootstrap must be clearly in /. */ 130 strlcpy(name, params->stage2, ISO_MAXNAMLEN); 131 stage2 = name; 132 if (stage2[0] == '/') 133 stage2++; 134 if (strchr(stage2, '/') != NULL) { 135 warnx("The secondary bootstrap `%s' must be in / " 136 "on filesystem `%s'", params->stage2, params->filesystem); 137 return 0; 138 } 139 if (strchr(stage2, '.') == NULL) { 140 /* 141 * XXX should fix isofncmp()? 142 */ 143 strlcat(name, ".", ISO_MAXNAMLEN); 144 } 145 146 rv = pread(params->fsfd, &ipd, sizeof(ipd), 147 ISO_DEFAULT_BLOCK_SIZE * 16); 148 if (rv == -1) { 149 warn("Reading primary descriptor in `%s'", params->filesystem); 150 return 0; 151 } else if (rv != sizeof(ipd)) { 152 warnx("Reading primary descriptor in `%s': short read", 153 params->filesystem); 154 return 0; 155 } 156 blocksize = isonum_723((u_char *)ipd.logical_block_size); 157 158 idr = (void *)ipd.root_directory_record; 159 loc = (off_t)isonum_733(idr->extent) * blocksize; 160 rv = pread(params->fsfd, buf, blocksize, loc); 161 if (rv == -1) { 162 warn("Reading root directory record in `%s'", 163 params->filesystem); 164 return 0; 165 } else if (rv != sizeof(ipd)) { 166 warnx("Reading root directory record in `%s': short read", 167 params->filesystem); 168 return 0; 169 } 170 171 found = 0; 172 for (i = 0; i < blocksize - sizeof(struct iso_directory_record); 173 i += (u_char)idr->length[0]) { 174 idr = (void *)&buf[i]; 175 176 #ifdef DEBUG 177 printf("i = %d, idr->length[0] = %3d\n", 178 i, (u_char)idr->length[0]); 179 #endif 180 /* check end of entries */ 181 if (idr->length[0] == 0) { 182 #ifdef DEBUG 183 printf("end of entries\n"); 184 #endif 185 break; 186 } 187 188 if (idr->flags[0] & 2) { 189 /* skip directory entries */ 190 #ifdef DEBUG 191 printf("skip directory entry\n"); 192 #endif 193 continue; 194 } 195 if (idr->name_len[0] == 1 && 196 (idr->name[0] == 0 || idr->name[0] == 1)) { 197 /* skip "." and ".." */ 198 #ifdef DEBUG 199 printf("skip dot dot\n"); 200 #endif 201 continue; 202 } 203 #ifdef DEBUG 204 { 205 int j; 206 207 printf("filename:"); 208 for (j = 0; j < isonum_711(idr->name_len); j++) 209 printf("%c", idr->name[j]); 210 printf("\n"); 211 } 212 #endif 213 if (isofncmp((u_char *)stage2, strlen(stage2), 214 (u_char *)idr->name, 215 isonum_711((u_char *)idr->name_len), 0) == 0) { 216 found = 1; 217 /* ISO filesystem always has contiguous file blocks */ 218 blocks[0].block = (int64_t)isonum_733(idr->extent); 219 blocks[0].blocksize = 220 roundup(isonum_733(idr->size), blocksize); 221 *maxblk = 1; 222 #ifdef DEBUG 223 printf("block = %ld, blocksize = %ld\n", 224 (long)blocks[0].block, blocks[0].blocksize); 225 #endif 226 break; 227 } 228 } 229 230 if (found == 0) { 231 warnx("Can't find secondary bootstrap `%s' in filesystem `%s'", 232 params->stage2, params->filesystem); 233 return 0; 234 } 235 236 return 1; 237 } 238
Indexes created Sat Sep 20 22:09:52 GMT 2025