/*      $NetBSD: bbinfo.c,v 1.14 2009/04/05 11:55:39 lukem Exp $ */

/*-
* Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Fredette, Paul Kranenburg, and Luke Mewburn.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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(__lint)
__RCSID("$NetBSD: bbinfo.c,v 1.14 2009/04/05 11:55:39 lukem Exp $");
#endif  /* !__lint */

#include <sys/param.h>
#ifndef HAVE_NBTOOL_CONFIG_H
#include <sys/ioctl.h>
#include <sys/dkio.h>
#include <errno.h>
#endif

#include <assert.h>
#include <err.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "installboot.h"

int
shared_bbinfo_clearboot(ib_params *params, struct bbinfo_params *bbparams,
       int (*callback)(ib_params *, struct bbinfo_params *, uint8_t *))
{
       uint8_t *bb;
       ssize_t rv;
       int     retval;

       assert(params != NULL);
       assert(params->fsfd != -1);
       assert(params->filesystem != NULL);
       assert(bbparams != NULL);
       assert((strlen(bbparams->magic) + 1) == 32);

       retval = 0;
       if ((bb = malloc(bbparams->maxsize)) == NULL) {
               warn("Allocating %lu bytes for bbinfo",
                   (unsigned long) bbparams->maxsize);
               goto done;
       }

               /* First check that it _could_ exist here */
       rv = pread(params->fsfd, bb, bbparams->maxsize, bbparams->offset);
       if (rv == -1) {
               warn("Reading `%s'", params->filesystem);
               goto done;
       } else if ((uint32_t)rv != bbparams->maxsize) {
               warnx("Reading `%s': short read", params->filesystem);
               goto done;
       }

               /* Now clear out (past the header offset) */
       memset(bb + bbparams->headeroffset, 0,
           bbparams->maxsize - bbparams->headeroffset);
       if (callback != NULL && ! (*callback)(params, bbparams, bb))
               goto done;

       if (params->flags & IB_VERBOSE)
               printf("%slearing boot block\n",
                   (params->flags & IB_NOWRITE) ? "Not c" : "C");
       if (params->flags & IB_NOWRITE) {
               retval = 1;
               goto done;
       }

       rv = pwrite(params->fsfd, bb, bbparams->maxsize, bbparams->offset);
#ifdef DIOCWLABEL
       if (rv == -1 && errno == EROFS) {
               /*
                * The first sector might be protected by
                * bounds_check_with_label(9)
                */
               int enable;

               enable = 1;
               rv = ioctl(params->fsfd, DIOCWLABEL, &enable);
               if (rv != 0) {
                       warn("Cannot enable writes to the label sector");
                       goto done;
               }

               rv = pwrite(params->fsfd, bb, bbparams->maxsize,
                   bbparams->offset);

               /* Reset write-protect. */
               enable = 0;
               (void)ioctl(params->fsfd, DIOCWLABEL, &enable);
       }
#endif
       if (rv == -1) {
               warn("Writing `%s'", params->filesystem);
               goto done;
       } else if ((uint32_t)rv != bbparams->maxsize) {
               warnx("Writing `%s': short write", params->filesystem);
               goto done;
       } else
               retval = 1;

done:
       if (bb != NULL)
               free(bb);
       return (retval);
}

int
shared_bbinfo_setboot(ib_params *params, struct bbinfo_params *bbparams,
       int (*callback)(ib_params *, struct bbinfo_params *, uint8_t *))
{
       uint8_t         *bb;
       int             retval;
       ssize_t         rv;
       size_t          bbi;
       struct shared_bbinfo    *bbinfop;       /* bbinfo in prototype image */
       uint32_t        maxblk, nblk, blk_i;
       ib_block        *blocks;

       assert(params != NULL);
       assert(params->fsfd != -1);
       assert(params->filesystem != NULL);
       assert(params->fstype != NULL);
       assert(params->s1fd != -1);
       assert(params->stage1 != NULL);
       assert(bbparams != NULL);
       assert((strlen(bbparams->magic) + 1) == 32);

       bbinfop = NULL;         /* XXXGCC -Wuninitialized [sparc64] */
       retval = 0;
       blocks = NULL;
       if ((bb = malloc(bbparams->maxsize)) == NULL) {
               warn("Allocating %lu bytes for bbinfo",
                   (unsigned long) bbparams->maxsize);
               goto done;
       }

       if (params->stage2 == NULL) {
               warnx("Name of secondary bootstrap not provided");
               goto done;
       }

       if (params->s1stat.st_size >
           bbparams->maxsize - bbparams->headeroffset) {
               warnx("`%s' cannot be larger than %lu bytes",
                   params->stage1, (unsigned long)(bbparams->maxsize -
                       bbparams->headeroffset));
               goto done;
       }

       memset(bb, 0, bbparams->maxsize);
       rv = read(params->s1fd, bb + bbparams->headeroffset,
           bbparams->maxsize - bbparams->headeroffset);
       if (rv == -1) {
               warn("Reading `%s'", params->stage1);
               goto done;
       }

               /*
                * Quick sanity check that the bootstrap given
                * is *not* an ELF executable.
                */
       if (memcmp(bb + bbparams->headeroffset + 1, "ELF", strlen("ELF"))
           == 0) {
               warnx("`%s' is an ELF executable; need raw binary",
                   params->stage1);
               goto done;
       }

#define HOSTTOTARGET32(x) ((bbparams->endian == BBINFO_LITTLE_ENDIAN) \
                           ? (uint32_t)htole32((x)) : (uint32_t)htobe32((x)))
#define TARGET32TOHOST(x) ((bbparams->endian == BBINFO_LITTLE_ENDIAN) \
                           ? (uint32_t)le32toh((x)) : (uint32_t)be32toh((x)))

               /* Look for the bbinfo structure. */
       bbinfop = NULL;
       for (bbi = 0; bbi < bbparams->maxsize; bbi += sizeof(uint32_t)) {
               bbinfop = (void *) (bb + bbparams->headeroffset + bbi);
               if (memcmp(bbinfop->bbi_magic, bbparams->magic,
                           sizeof(bbinfop->bbi_magic)) == 0)
                       break;
       }
       if (bbi >= bbparams->maxsize) {
               warnx("%s bbinfo structure not found in `%s'",
                   params->machine->name, params->stage1);
               goto done;
       }
       maxblk = TARGET32TOHOST(bbinfop->bbi_block_count);
       if (maxblk == 0 || maxblk > (bbparams->maxsize / sizeof(uint32_t))) {
               warnx("%s bbinfo structure in `%s' has preposterous size `%u'",
                   params->machine->name, params->stage1, maxblk);
               goto done;
       }

               /* Allocate space for our block list. */
       blocks = malloc(sizeof(*blocks) * maxblk);
       if (blocks == NULL) {
               warn("Allocating %lu bytes",
                   (unsigned long)sizeof(*blocks) * maxblk);
               goto done;
       }

       if (S_ISREG(params->fsstat.st_mode)) {
               if (fsync(params->fsfd) == -1)
                       warn("Synchronising file system `%s'",
                           params->filesystem);
       } else {
               /* Ensure the secondary bootstrap is on disk. */
               sync();
       }

               /* Collect the blocks for the secondary bootstrap. */
       nblk = maxblk;
       if (! params->fstype->findstage2(params, &nblk, blocks))
               goto done;
       if (nblk == 0) {
               warnx("Secondary bootstrap `%s' is empty",
                   params->stage2);
               goto done;
       }

               /* Save those blocks in the primary bootstrap. */
       bbinfop->bbi_block_count = HOSTTOTARGET32(nblk);
       bbinfop->bbi_block_size = HOSTTOTARGET32(blocks[0].blocksize);
       for (blk_i = 0; blk_i < nblk; blk_i++) {
               bbinfop->bbi_block_table[blk_i] =
                   HOSTTOTARGET32(blocks[blk_i].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);
                       goto done;
               }
       }
       if (callback != NULL && ! (*callback)(params, bbparams, bb))
               goto done;

       if (params->flags & IB_VERBOSE) {
               printf("Bootstrap start sector: %u\n",
                   bbparams->offset / bbparams->blocksize);
               printf("Bootstrap byte count:   %u\n", (unsigned)rv);
               printf("Bootstrap block table:  "
                       "%u entries of %u bytes available, %u used:",
                   maxblk, blocks[0].blocksize, nblk);
               for (blk_i = 0; blk_i < nblk; blk_i++)
                       printf(" %llu",
                           (unsigned long long)blocks[blk_i].block);
               printf("\n%sriting bootstrap\n",
                   (params->flags & IB_NOWRITE) ? "Not w" : "W");
       }
       if (params->flags & IB_NOWRITE) {
               retval = 1;
               goto done;
       }

       rv = pwrite(params->fsfd, bb, bbparams->maxsize, bbparams->offset);
#ifdef DIOCWLABEL
       if (rv == -1 && errno == EROFS) {
               /*
                * The first sector might be protected by
                * bounds_check_with_label(9)
                */
               int enable;

               enable = 1;
               rv = ioctl(params->fsfd, DIOCWLABEL, &enable);
               if (rv != 0) {
                       warn("Cannot enable writes to the label sector");
                       goto done;
               }

               rv = pwrite(params->fsfd, bb, bbparams->maxsize,
                   bbparams->offset);

               /* Reset write-protect. */
               enable = 0;
               (void)ioctl(params->fsfd, DIOCWLABEL, &enable);
       }
#endif
       if (rv == -1) {
               warn("Writing `%s'", params->filesystem);
               goto done;
       } else if ((uint32_t)rv != bbparams->maxsize) {
               warnx("Writing `%s': short write", params->filesystem);
               goto done;
       } else {
               retval = 1;
       }

done:
       if (blocks != NULL)
               free(blocks);
       if (bb != NULL)
               free(bb);
       return (retval);
}

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