distrib/cdrom/macppc_installboot/cd9660.c

   1 /*      $NetBSD: cd9660.c,v 1.2 2008/02/27 13:08:52 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 2008/02/27 13:08:52 tsutsui Exp $");
  34 #endif  /* !__lint */
  35
  36 #include <sys/param.h>
  37 #include <sys/dirent.h>
  38
  39 #if !HAVE_NBTOOL_CONFIG_H
  40 #include <sys/mount.h>
  41 #endif
  42
  43 #include <assert.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <stdarg.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #include <fs/cd9660/iso.h>
  54
  55 #include "installboot.h"
  56
  57 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
  58 #define MAXLEN          16
  59
  60
  61 int
  62 cd9660_match(ib_params *params)
  63 {
  64         int rv, blocksize;
  65         struct iso_primary_descriptor ipd;
  66
  67         assert(params != NULL);
  68         assert(params->fstype != NULL);
  69         assert(params->fsfd != -1);
  70
  71         rv = pread(params->fsfd, &ipd, sizeof(ipd),
  72             ISO_DEFAULT_BLOCK_SIZE * 16);
  73         if (rv == -1) {
  74                 warn("Reading primary descriptor in `%s'", params->filesystem);
  75                 return 0;
  76         } else if (rv != sizeof(ipd)) {
  77                 warnx("Reading primary descriptor in `%s': short read",
  78                    params->filesystem);
  79                 return 0;
  80         }
  81
  82         if (ipd.type[0] != ISO_VD_PRIMARY ||
  83             strncmp(ipd.id, ISO_STANDARD_ID, sizeof(ipd.id)) != 0 ||
  84             ipd.version[0] != 1) {
  85                 warnx("Filesystem `%s' is not ISO9660 format",
  86                    params->filesystem);
  87                 return 0;
  88         }
  89
  90         blocksize = isonum_723((char *)ipd.logical_block_size);
  91         if (blocksize != ISO_DEFAULT_BLOCK_SIZE) {
  92                 warnx("Invalid blocksize %d in `%s'",
  93                     blocksize, params->filesystem);
  94                 return 0;
  95         }
  96
  97         params->fstype->blocksize = blocksize;
  98         params->fstype->needswap = 0;
  99
 100         return 1;
 101 }
 102
 103 int
 104 cd9660_findstage2(ib_params *params, uint32_t *maxblk, ib_block *blocks)
 105 {
 106         uint8_t buf[ISO_DEFAULT_BLOCK_SIZE];
 107         char name[MAXNAMLEN];
 108         char *ofwboot;
 109         off_t loc;
 110         int rv, blocksize, found, i;
 111         struct iso_primary_descriptor ipd;
 112         struct iso_directory_record *idr;
 113
 114         assert(params != NULL);
 115         assert(params->stage2 != NULL);
 116         assert(maxblk != NULL);
 117         assert(blocks != NULL);
 118
 119 #if 0
 120         if (params->flags & IB_STAGE2START)
 121                 return hardcode_stage2(params, maxblk, blocks);
 122 #endif
 123
 124         /* The secondary bootstrap must be clearly in /. */
 125         strlcpy(name, params->stage2, MAXNAMLEN);
 126         ofwboot = name;
 127         if (ofwboot[0] == '/')
 128                 ofwboot++;
 129         if (strchr(ofwboot, '/') != NULL) {
 130                 warnx("The secondary bootstrap `%s' must be in / "
 131                     "on filesystem `%s'", params->stage2, params->filesystem);
 132                 return 0;
 133         }
 134         if (strchr(ofwboot, '.') == NULL) {
 135                 /*
 136                  * XXX should fix isofncmp()?
 137                  */
 138                 strlcat(ofwboot, ".", MAXNAMLEN);
 139         }
 140
 141         rv = pread(params->fsfd, &ipd, sizeof(ipd),
 142             ISO_DEFAULT_BLOCK_SIZE * 16);
 143         if (rv == -1) {
 144                 warn("Reading primary descriptor in `%s'", params->filesystem);
 145                 return 0;
 146         } else if (rv != sizeof(ipd)) {
 147                 warnx("Reading primary descriptor in `%s': short read",
 148                    params->filesystem);
 149                 return 0;
 150         }
 151         blocksize = isonum_723((char *)ipd.logical_block_size);
 152
 153         idr = (void *)ipd.root_directory_record;
 154         loc = (off_t)isonum_733(idr->extent) * blocksize;
 155         rv = pread(params->fsfd, buf, blocksize, loc);
 156         if (rv == -1) {
 157                 warn("Reading root directory record in `%s'",
 158                     params->filesystem);
 159                 return 0;
 160         } else if (rv != sizeof(ipd)) {
 161                 warnx("Reading root directory record in `%s': short read",
 162                    params->filesystem);
 163                 return 0;
 164         }
 165
 166         found = 0;
 167         for (i = 0; i < blocksize - sizeof(struct iso_directory_record);
 168             i += (u_char)idr->length[0]) {
 169                 idr = (void *)&buf[i];
 170
 171 #ifdef DEBUG
 172                 printf("i = %d, idr->length[0] = %3d\n",
 173                     i, (u_char)idr->length[0]);
 174 #endif
 175                 /* check end of entries */
 176                 if (idr->length[0] == 0) {
 177 #ifdef DEBUG
 178                 printf("end of entries\n");
 179 #endif
 180                         break;
 181                 }
 182
 183                 if (idr->flags[0] & 2) {
 184                         /* skip directory entries */
 185 #ifdef DEBUG
 186                         printf("skip directory entry\n");
 187 #endif
 188                         continue;
 189                 }
 190                 if (idr->name_len[0] == 1 &&
 191                     (idr->name[0] == 0 || idr->name[0] == 1)) {
 192                         /* skip "." and ".." */
 193 #ifdef DEBUG
 194                         printf("skip dot dot\n");
 195 #endif
 196                         continue;
 197                 }
 198 #ifdef DEBUG
 199                 {
 200                         int j;
 201
 202                         printf("filename:");
 203                         for (j = 0; j < isonum_711(idr->name_len); j++)
 204                                 printf("%c", idr->name[j]);
 205                         printf("\n");
 206                 }
 207 #endif
 208                 if (isofncmp(ofwboot, strlen(ofwboot),
 209                     idr->name, isonum_711(idr->name_len), 0) == 0) {
 210                         found = 1;
 211                         /* ISO filesystem always has contiguous file blocks */
 212                         blocks[0].block = (int64_t)isonum_733(idr->extent);
 213                         /* XXX bootxx assumes blocksize is 512 */
 214                         blocks[0].block *= blocksize / 512;
 215                         blocks[0].blocksize =
 216                             roundup(isonum_733(idr->size), blocksize);
 217                         *maxblk = 1;
 218 #ifdef DEBUG
 219                         printf("block = %ld, blocksize = %ld\n",
 220                             (long)blocks[0].block, blocks[0].blocksize);
 221 #endif
 222                         break;
 223                 }
 224         }
 225
 226         if (found == 0) {
 227                 warnx("Can't find secondary bootstrap `%s' in filesystem `%s'",
 228                     params->stage2, params->filesystem);
 229                 return 0;
 230         }
 231
 232         return 1;
 233 }