/*      $NetBSD: cd9660.c,v 1.2 2024/05/24 09:59:42 tsutsui Exp $       */

/*-
* Copyright (c) 2005 Izumi Tsutsui.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if defined(__RCSID) && !defined(__lint)
__RCSID("$NetBSD: cd9660.c,v 1.2 2024/05/24 09:59:42 tsutsui Exp $");
#endif  /* !__lint */

#include <sys/param.h>

#if !HAVE_NBTOOL_CONFIG_H
#include <sys/mount.h>
#endif
#if !HAVE_NBTOOL_CONFIG_H || HAVE_SYS_ENDIAN_H
#include <sys/endian.h>
#endif

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>

#include <fs/cd9660/iso.h>
#include <fs/cd9660/cd9660_extern.h>

#include "installboot.h"

#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
#define MAXLEN          16


int
cd9660_match(ib_params *params)
{
       int rv, blocksize;
       struct iso_primary_descriptor ipd;

       assert(params != NULL);
       assert(params->fstype != NULL);
       assert(params->fsfd != -1);

       rv = pread(params->fsfd, &ipd, sizeof(ipd),
           ISO_DEFAULT_BLOCK_SIZE * 16);
       if (rv == -1) {
               warn("Reading primary descriptor in `%s'", params->filesystem);
               return 0;
       } else if (rv != sizeof(ipd)) {
               warnx("Reading primary descriptor in `%s': short read",
                  params->filesystem);
               return 0;
       }

       if (ipd.type[0] != ISO_VD_PRIMARY ||
           strncmp(ipd.id, ISO_STANDARD_ID, sizeof(ipd.id)) != 0 ||
           ipd.version[0] != 1) {
               warnx("Filesystem `%s' is not ISO9660 format",
                  params->filesystem);
               return 0;
       }

       blocksize = isonum_723((u_char *)ipd.logical_block_size);
       if (blocksize != ISO_DEFAULT_BLOCK_SIZE) {
               warnx("Invalid blocksize %d in `%s'",
                   blocksize, params->filesystem);
               return 0;
       }

       params->fstype->blocksize = blocksize;
       params->fstype->needswap = 0;

       return 1;
}

int
cd9660_findstage2(ib_params *params, uint32_t *maxblk, ib_block *blocks)
{
       uint8_t buf[ISO_DEFAULT_BLOCK_SIZE];
       char name[ISO_MAXNAMLEN];
       char *stage2;
       off_t loc;
       int rv, blocksize, found;
       u_int i;
       struct iso_primary_descriptor ipd;
       struct iso_directory_record *idr;

       assert(params != NULL);
       assert(params->stage2 != NULL);
       assert(maxblk != NULL);
       assert(blocks != NULL);

#if 0
       if (params->flags & IB_STAGE2START)
               return hardcode_stage2(params, maxblk, blocks);
#endif

       /* The secondary bootstrap must be clearly in /. */
       strlcpy(name, params->stage2, ISO_MAXNAMLEN);
       stage2 = name;
       if (stage2[0] == '/')
               stage2++;
       if (strchr(stage2, '/') != NULL) {
               warnx("The secondary bootstrap `%s' must be in / "
                   "on filesystem `%s'", params->stage2, params->filesystem);
               return 0;
       }
       if (strchr(stage2, '.') == NULL) {
               /*
                * XXX should fix isofncmp()?
                */
               strlcat(name, ".", ISO_MAXNAMLEN);
       }

       rv = pread(params->fsfd, &ipd, sizeof(ipd),
           ISO_DEFAULT_BLOCK_SIZE * 16);
       if (rv == -1) {
               warn("Reading primary descriptor in `%s'", params->filesystem);
               return 0;
       } else if (rv != sizeof(ipd)) {
               warnx("Reading primary descriptor in `%s': short read",
                  params->filesystem);
               return 0;
       }
       blocksize = isonum_723((u_char *)ipd.logical_block_size);

       idr = (void *)ipd.root_directory_record;
       loc = (off_t)isonum_733(idr->extent) * blocksize;
       rv = pread(params->fsfd, buf, blocksize, loc);
       if (rv == -1) {
               warn("Reading root directory record in `%s'",
                   params->filesystem);
               return 0;
       } else if (rv != sizeof(ipd)) {
               warnx("Reading root directory record in `%s': short read",
                  params->filesystem);
               return 0;
       }

       found = 0;
       for (i = 0; i < blocksize - sizeof(struct iso_directory_record);
           i += (u_char)idr->length[0]) {
               idr = (void *)&buf[i];

#ifdef DEBUG
               printf("i = %d, idr->length[0] = %3d\n",
                   i, (u_char)idr->length[0]);
#endif
               /* check end of entries */
               if (idr->length[0] == 0) {
#ifdef DEBUG
               printf("end of entries\n");
#endif
                       break;
               }

               if (idr->flags[0] & 2) {
                       /* skip directory entries */
#ifdef DEBUG
                       printf("skip directory entry\n");
#endif
                       continue;
               }
               if (idr->name_len[0] == 1 &&
                   (idr->name[0] == 0 || idr->name[0] == 1)) {
                       /* skip "." and ".." */
#ifdef DEBUG
                       printf("skip dot dot\n");
#endif
                       continue;
               }
#ifdef DEBUG
               {
                       int j;

                       printf("filename:");
                       for (j = 0; j < isonum_711(idr->name_len); j++)
                               printf("%c", idr->name[j]);
                       printf("\n");
               }
#endif
               if (isofncmp((u_char *)stage2, strlen(stage2),
                   (u_char *)idr->name,
                   isonum_711((u_char *)idr->name_len), 0) == 0) {
                       found = 1;
                       /* ISO filesystem always has contiguous file blocks */
                       blocks[0].block = (int64_t)isonum_733(idr->extent);
                       blocks[0].blocksize =
                           roundup(isonum_733(idr->size), blocksize);
                       *maxblk = 1;
#ifdef DEBUG
                       printf("block = %ld, blocksize = %ld\n",
                           (long)blocks[0].block, blocks[0].blocksize);
#endif
                       break;
               }
       }

       if (found == 0) {
               warnx("Can't find secondary bootstrap `%s' in filesystem `%s'",
                   params->stage2, params->filesystem);
               return 0;
       }

       return 1;
}

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