cd9660.c revision 1.1
1 /* $NetBSD: cd9660.c,v 1.1 2024/05/19 15:48:57 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 1.1 2024/05/19 15:48:57 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 42 #include <assert.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <stdarg.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include <dirent.h> 52 53 #include <fs/cd9660/iso.h> 54 #include <fs/cd9660/cd9660_extern.h> 55 56 #include "installboot.h" 57 58 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 59 #define MAXLEN 16 60 61 62 int 63 cd9660_match(ib_params *params) 64 { 65 int rv, blocksize; 66 struct iso_primary_descriptor ipd; 67 68 assert(params != NULL); 69 assert(params->fstype != NULL); 70 assert(params->fsfd != -1); 71 72 rv = pread(params->fsfd, &ipd, sizeof(ipd), 73 ISO_DEFAULT_BLOCK_SIZE * 16); 74 if (rv == -1) { 75 warn("Reading primary descriptor in `%s'", params->filesystem); 76 return 0; 77 } else if (rv != sizeof(ipd)) { 78 warnx("Reading primary descriptor in `%s': short read", 79 params->filesystem); 80 return 0; 81 } 82 83 if (ipd.type[0] != ISO_VD_PRIMARY || 84 strncmp(ipd.id, ISO_STANDARD_ID, sizeof(ipd.id)) != 0 || 85 ipd.version[0] != 1) { 86 warnx("Filesystem `%s' is not ISO9660 format", 87 params->filesystem); 88 return 0; 89 } 90 91 blocksize = isonum_723((u_char *)ipd.logical_block_size); 92 if (blocksize != ISO_DEFAULT_BLOCK_SIZE) { 93 warnx("Invalid blocksize %d in `%s'", 94 blocksize, params->filesystem); 95 return 0; 96 } 97 98 params->fstype->blocksize = blocksize; 99 params->fstype->needswap = 0; 100 101 return 1; 102 } 103 104 int 105 cd9660_findstage2(ib_params *params, uint32_t *maxblk, ib_block *blocks) 106 { 107 uint8_t buf[ISO_DEFAULT_BLOCK_SIZE]; 108 char name[ISO_MAXNAMLEN]; 109 char *stage2; 110 off_t loc; 111 int rv, blocksize, found; 112 u_int i; 113 struct iso_primary_descriptor ipd; 114 struct iso_directory_record *idr; 115 116 assert(params != NULL); 117 assert(params->stage2 != NULL); 118 assert(maxblk != NULL); 119 assert(blocks != NULL); 120 121 #if 0 122 if (params->flags & IB_STAGE2START) 123 return hardcode_stage2(params, maxblk, blocks); 124 #endif 125 126 /* The secondary bootstrap must be clearly in /. */ 127 strlcpy(name, params->stage2, ISO_MAXNAMLEN); 128 stage2 = name; 129 if (stage2[0] == '/') 130 stage2++; 131 if (strchr(stage2, '/') != NULL) { 132 warnx("The secondary bootstrap `%s' must be in / " 133 "on filesystem `%s'", params->stage2, params->filesystem); 134 return 0; 135 } 136 if (strchr(stage2, '.') == NULL) { 137 /* 138 * XXX should fix isofncmp()? 139 */ 140 strlcat(name, ".", ISO_MAXNAMLEN); 141 } 142 143 rv = pread(params->fsfd, &ipd, sizeof(ipd), 144 ISO_DEFAULT_BLOCK_SIZE * 16); 145 if (rv == -1) { 146 warn("Reading primary descriptor in `%s'", params->filesystem); 147 return 0; 148 } else if (rv != sizeof(ipd)) { 149 warnx("Reading primary descriptor in `%s': short read", 150 params->filesystem); 151 return 0; 152 } 153 blocksize = isonum_723((u_char *)ipd.logical_block_size); 154 155 idr = (void *)ipd.root_directory_record; 156 loc = (off_t)isonum_733(idr->extent) * blocksize; 157 rv = pread(params->fsfd, buf, blocksize, loc); 158 if (rv == -1) { 159 warn("Reading root directory record in `%s'", 160 params->filesystem); 161 return 0; 162 } else if (rv != sizeof(ipd)) { 163 warnx("Reading root directory record in `%s': short read", 164 params->filesystem); 165 return 0; 166 } 167 168 found = 0; 169 for (i = 0; i < blocksize - sizeof(struct iso_directory_record); 170 i += (u_char)idr->length[0]) { 171 idr = (void *)&buf[i]; 172 173 #ifdef DEBUG 174 printf("i = %d, idr->length[0] = %3d\n", 175 i, (u_char)idr->length[0]); 176 #endif 177 /* check end of entries */ 178 if (idr->length[0] == 0) { 179 #ifdef DEBUG 180 printf("end of entries\n"); 181 #endif 182 break; 183 } 184 185 if (idr->flags[0] & 2) { 186 /* skip directory entries */ 187 #ifdef DEBUG 188 printf("skip directory entry\n"); 189 #endif 190 continue; 191 } 192 if (idr->name_len[0] == 1 && 193 (idr->name[0] == 0 || idr->name[0] == 1)) { 194 /* skip "." and ".." */ 195 #ifdef DEBUG 196 printf("skip dot dot\n"); 197 #endif 198 continue; 199 } 200 #ifdef DEBUG 201 { 202 int j; 203 204 printf("filename:"); 205 for (j = 0; j < isonum_711(idr->name_len); j++) 206 printf("%c", idr->name[j]); 207 printf("\n"); 208 } 209 #endif 210 if (isofncmp((u_char *)stage2, strlen(stage2), 211 (u_char *)idr->name, 212 isonum_711((u_char *)idr->name_len), 0) == 0) { 213 found = 1; 214 /* ISO filesystem always has contiguous file blocks */ 215 blocks[0].block = (int64_t)isonum_733(idr->extent); 216 blocks[0].blocksize = 217 roundup(isonum_733(idr->size), blocksize); 218 *maxblk = 1; 219 #ifdef DEBUG 220 printf("block = %ld, blocksize = %ld\n", 221 (long)blocks[0].block, blocks[0].blocksize); 222 #endif 223 break; 224 } 225 } 226 227 if (found == 0) { 228 warnx("Can't find secondary bootstrap `%s' in filesystem `%s'", 229 params->stage2, params->filesystem); 230 return 0; 231 } 232 233 return 1; 234 } 235
Indexes created Fri Oct 03 02:09:57 GMT 2025