/*      $NetBSD: installboot.c,v 1.9 2024/09/15 03:56:57 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 <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "installboot.h"

#define BSIZE           512
#define MAX_SB_SIZE     (64 * 1024)     /* XXX */
#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

static  void usage(void);

static  ib_params       installboot_params;

static  struct ib_fs cd9660_fstype = {
       .name = "cd9660",
       .match = cd9660_match,
       .findstage2 = cd9660_findstage2
};

int
main(int argc, char **argv)
{
       ib_params *params;
       uint8_t *bb;
       struct apple_part_map_entry pme;
       size_t bbi;
       struct shared_bbinfo *bbinfop;
       off_t partoff;
       uint32_t nblk, maxblk, blk_i;
       int rv;
       ib_block *blocks;
       uint64_t block;

       setprogname(argv[0]);
       params = &installboot_params;
       memset(params, 0, sizeof(*params));
       params->fsfd = -1;
       params->s1fd = -1;

       if (argc != 4)
               usage();

       params->filesystem = argv[1];
       params->fstype = &cd9660_fstype;

       if ((params->fsfd = open(params->filesystem, O_RDWR, 0600)) == -1)
               err(1, "Opening file system `%s' read", params->filesystem);
       if (fstat(params->fsfd, &params->fsstat) == -1)
               err(1, "Examining file system `%s'", params->filesystem);
       if (!params->fstype->match(params))
               errx(1, "File system `%s' is not of type %s",
                   params->filesystem, params->fstype->name);

#ifdef DEBUG
       printf("file system: %s, %ld bytes\n",
           params->filesystem, (long)params->fsstat.st_size);
#endif

       /*
        * Find space for primary boot from the second (NetBSD_BootBlock)
        * partition.
        */
       if (pread(params->fsfd, &pme, sizeof pme, BSIZE * 2) != sizeof(pme))
               err(1, "read pme from file system `%s'", params->filesystem);

       if (strcmp((char *)pme.pmPartName, "NetBSD_BootBlock"))
               err(1, "invalid partition map in file system `%s'",
                   params->filesystem);

       /* pmPyPartStart is written by mkisofs */
       partoff = BSIZE * be32toh(pme.pmPyPartStart);

#ifdef DEBUG
       printf("NetBSD partition offset = %ld\n", (long)partoff);
#endif

       params->stage1 = argv[2];

       if ((params->s1fd = open(params->stage1, O_RDONLY, 0600)) == -1)
               err(1, "Opening primary bootstrap `%s'", params->stage1);
       if (fstat(params->s1fd, &params->s1stat) == -1)
               err(1, "Examining primary bootstrap `%s'", params->stage1);
       if (!S_ISREG(params->s1stat.st_mode))
               err(1, "`%s' must be a regular file", params->stage1);

       if (params->s1stat.st_size > MACPPC_BOOT_BLOCK_MAX_SIZE)
               err(1, "primary bootrap `%s' too large (%ld bytes)",
                   params->stage1, (long)params->s1stat.st_size);

#ifdef DEBUG
       printf("primary boot: %s, %ld bytes\n",
           params->stage1, (long)params->s1stat.st_size);
#endif

       params->stage2 = argv[3];

       bb = calloc(1, MACPPC_BOOT_BLOCK_MAX_SIZE);
       if (bb == NULL)
               err(1, "Allocating %ul bytes for bbinfo",
                   MACPPC_BOOT_BLOCK_MAX_SIZE);

       rv = read(params->s1fd, bb, params->s1stat.st_size);

       if (rv == -1)
               err(1, "Reading `%s'", params->stage1);

       if (memcmp(bb + 1, "ELF", strlen("ELF")) == 0) {
               warnx("`%s' is an ELF executable; need raw binary",
                   params->stage1);
       }

       /* look for the bbinfo structure */
       for (bbi = 0; bbi < MACPPC_BOOT_BLOCK_MAX_SIZE;
           bbi += sizeof(uint32_t)) {
               bbinfop = (void *)(bb + bbi);
               if (memcmp(bbinfop->bbi_magic, MACPPC_BBINFO_MAGIC,
                   sizeof(bbinfop->bbi_magic)) == 0) {
#ifdef DEBUG
                       printf("magic found: %s\n", bbinfop->bbi_magic);
#endif
                       break;
               }
       }
       if (bbi >= MACPPC_BOOT_BLOCK_MAX_SIZE)
               err(1, "bbinfo structure not found in `%s'", params->stage1);

       maxblk = be32toh(bbinfop->bbi_block_count);
       if (maxblk == 0 ||
           maxblk > (MACPPC_BOOT_BLOCK_MAX_SIZE / sizeof(uint32_t)))
               err(1, "bbinfo structure in `%s' has preposterous size `%u'",
                   params->stage1, maxblk);

       blocks = malloc(sizeof(*blocks) * maxblk);
       if (blocks == NULL) {
               err(1, "Allocating %lu bytes for blocks",
                   (unsigned long)sizeof(*blocks) * maxblk);
       }

       if (S_ISREG(params->fsstat.st_mode)) {
               if (fsync(params->fsfd) == -1)
                       err(1, "Synchronising file system `%s'",
                           params->filesystem);
       }

       nblk = maxblk;
       if (!params->fstype->findstage2(params, &nblk, blocks)) {
               exit(1);
       }

       bbinfop->bbi_block_count = htobe32(nblk);
       bbinfop->bbi_block_size = htobe32(blocks[0].blocksize);
       for (blk_i = 0; blk_i < nblk; blk_i++) {
               /* XXX bootxx assumes blocksize is 512 */
               block = blocks[blk_i].block * (params->fstype->blocksize / 512);
               bbinfop->bbi_block_table[blk_i] = htobe32(block);
               if (blocks[blk_i].blocksize < blocks[0].blocksize &&
                   blk_i + 1 != nblk) {
                       warnx("Secondary bootstrap `%s' blocks do not have "
                           "a uniform size", params->stage2);
                       exit(1);
               }
       }

       /* XXX no write option */

       if (pwrite(params->fsfd, bb, MACPPC_BOOT_BLOCK_MAX_SIZE, partoff) !=
           MACPPC_BOOT_BLOCK_MAX_SIZE)
               err(1, "write bootblock");

       if (S_ISREG(params->fsstat.st_mode)) {
               if (fsync(params->fsfd) == -1)
                       err(1, "Synchronising file system `%s'",
                           params->filesystem);
       }

       free(bb);

       if (close(params->fsfd) == -1)
               err(1, "Closing file system `%s'", params->filesystem);
       if (close(params->s1fd) == -1)
               err(1, "Closing primary bootstrap `%s'", params->stage1);

       return 0;
}

static void
usage(void)
{
       const char *prog;

       prog = getprogname();
       fprintf(stderr, "usage: %s hybrid-cd-image primary secondary\n", prog);
       exit(1);
}

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