NetBSD/distrib/cdrom/macppc_installboot/cd9660.c

234 lines
6.0 KiB
C

/* $NetBSD: cd9660.c,v 1.3 2008/05/14 13:29:27 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 1.3 2008/05/14 13:29:27 tsutsui Exp $");
#endif /* !__lint */
#include <sys/param.h>
#include <sys/dirent.h>
#if !HAVE_NBTOOL_CONFIG_H
#include <sys/mount.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 <fs/cd9660/iso.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((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[MAXNAMLEN];
char *ofwboot;
off_t loc;
int rv, blocksize, found, 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, MAXNAMLEN);
ofwboot = name;
if (ofwboot[0] == '/')
ofwboot++;
if (strchr(ofwboot, '/') != NULL) {
warnx("The secondary bootstrap `%s' must be in / "
"on filesystem `%s'", params->stage2, params->filesystem);
return 0;
}
if (strchr(ofwboot, '.') == NULL) {
/*
* XXX should fix isofncmp()?
*/
strlcat(ofwboot, ".", 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((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(ofwboot, strlen(ofwboot),
idr->name, isonum_711(idr->name_len), 0) == 0) {
found = 1;
/* ISO filesystem always has contiguous file blocks */
blocks[0].block = (int64_t)isonum_733(idr->extent);
/* XXX bootxx assumes blocksize is 512 */
blocks[0].block *= blocksize / 512;
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;
}