334 lines
7.8 KiB
C
334 lines
7.8 KiB
C
/* $NetBSD: biosboot.c,v 1.32 2019/06/20 10:56:38 martin Exp $ */
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/*
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to the NetBSD Foundation
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* by Mike M. Volokhov. Development of this software was supported by the
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* Google Summer of Code program.
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* The GSoC project was mentored by Allen Briggs and Joerg Sonnenberger.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#ifdef __RCSID
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__RCSID("$NetBSD: biosboot.c,v 1.32 2019/06/20 10:56:38 martin Exp $");
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#endif
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/bootblock.h>
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#if defined(DIOCGWEDGEINFO) && !defined(HAVE_NBTOOL_CONFIG_H)
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#define USE_WEDGES
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#endif
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#ifdef USE_WEDGES
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#include <sys/disk.h>
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#endif
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#include <err.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "map.h"
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#include "gpt.h"
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#include "gpt_private.h"
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#define DEFAULT_BOOTDIR "/usr/mdec"
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#define DEFAULT_BOOTCODE "gptmbr.bin"
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static int cmd_biosboot(gpt_t, int, char *[]);
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static const char *biosboothelp[] = {
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"[-A] [-c bootcode] [-i index] [-L label] [-b startsec]",
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#if notyet
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"[-a alignment] [-b blocknr] [-i index] [-l label]",
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"[-s size] [-t type]",
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#endif
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};
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struct gpt_cmd c_biosboot = {
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"biosboot",
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cmd_biosboot,
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biosboothelp, __arraycount(biosboothelp),
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0,
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};
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#define usage() gpt_usage(NULL, &c_biosboot)
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static struct mbr*
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read_boot(gpt_t gpt, const char *bootpath)
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{
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int bfd, ret = -1;
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struct mbr *buf;
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struct stat st;
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char *bp;
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buf = NULL;
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bfd = -1;
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if (bootpath == NULL)
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bp = strdup(DEFAULT_BOOTDIR "/" DEFAULT_BOOTCODE);
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else if (*bootpath == '/')
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bp = strdup(bootpath);
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else {
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if (asprintf(&bp, "%s/%s", DEFAULT_BOOTDIR, bootpath) < 0)
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bp = NULL;
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}
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if (bp == NULL) {
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gpt_warn(gpt, "Can't allocate memory for bootpath");
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goto fail;
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}
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if ((buf = malloc((size_t)gpt->secsz)) == NULL) {
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gpt_warn(gpt, "Can't allocate memory for sector");
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goto fail;
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}
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if ((bfd = open(bp, O_RDONLY)) < 0 || fstat(bfd, &st) == -1) {
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gpt_warn(gpt, "Can't open `%s'", bp);
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goto fail;
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}
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if (st.st_size != MBR_DSN_OFFSET) {
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gpt_warnx(gpt, "The bootcode in `%s' does not match the"
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" expected size %u", bp, MBR_DSN_OFFSET);
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goto fail;
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}
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if (read(bfd, buf, (size_t)st.st_size) != (ssize_t)st.st_size) {
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gpt_warn(gpt, "Error reading from `%s'", bp);
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goto fail;
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}
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ret = 0;
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fail:
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if (bfd != -1)
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close(bfd);
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if (ret == -1) {
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free(buf);
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buf = NULL;
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}
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free(bp);
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return buf;
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}
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static int
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set_bootable(gpt_t gpt, map_t map, map_t tbl, unsigned int i)
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{
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unsigned int j;
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struct gpt_hdr *hdr = map->map_data;
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struct gpt_ent *ent;
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unsigned int ne = le32toh(hdr->hdr_entries);
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for (j = 0; j < ne; j++) {
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ent = gpt_ent(map, tbl, j);
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ent->ent_attr &= ~GPT_ENT_ATTR_LEGACY_BIOS_BOOTABLE;
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}
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ent = gpt_ent(map, tbl, i);
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ent->ent_attr |= GPT_ENT_ATTR_LEGACY_BIOS_BOOTABLE;
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return gpt_write_crc(gpt, map, tbl);
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}
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static int
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biosboot(gpt_t gpt, daddr_t start, uint64_t size, u_int entry, uint8_t *label,
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const char *bootpath, int active)
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{
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map_t mbrmap, m;
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struct mbr *mbr, *bootcode;
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unsigned int i;
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struct gpt_ent *ent;
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uint8_t utfbuf[__arraycount(ent->ent_name) * 3 + 1];
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/*
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* Parse and validate partition maps
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*/
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if (gpt_hdr(gpt) == NULL)
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return -1;
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mbrmap = map_find(gpt, MAP_TYPE_PMBR);
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if (mbrmap == NULL || mbrmap->map_start != 0) {
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gpt_warnx(gpt, "No valid Protective MBR found");
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return -1;
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}
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mbr = mbrmap->map_data;
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/*
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* Update the boot code
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*/
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if ((bootcode = read_boot(gpt, bootpath)) == NULL) {
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gpt_warnx(gpt, "Error reading bootcode");
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return -1;
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}
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(void)memcpy(&mbr->mbr_code, &bootcode->mbr_code,
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sizeof(mbr->mbr_code));
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free(bootcode);
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for (i = 0; i < __arraycount(mbr->mbr_part); i++)
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if (mbr->mbr_part[i].part_typ == MBR_PTYPE_PMBR)
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mbr->mbr_part[i].part_flag = active ? 0x80 : 0;
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/*
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* Walk through the GPT and see where we can boot from
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*/
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for (m = map_first(gpt); m != NULL; m = m->map_next) {
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if (m->map_type != MAP_TYPE_GPT_PART || m->map_index < 1)
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continue;
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ent = m->map_data;
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/* first, prefer user selection */
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if (entry > 0 && m->map_index == entry)
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break;
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if (label != NULL) {
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utf16_to_utf8(ent->ent_name,
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__arraycount(ent->ent_name), utfbuf,
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__arraycount(utfbuf));
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if (strcmp((char *)label, (char *)utfbuf) == 0)
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break;
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}
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/* next, partition as could be specified by wedge */
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if (entry < 1 && label == NULL && size > 0 &&
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m->map_start == start && m->map_size == (off_t)size)
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break;
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/* next could be start sector specified by -b option */
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if (entry < 1 && label == NULL && size == 0 &&
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m->map_start == start)
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break;
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}
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if (m == NULL) {
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gpt_warnx(gpt, "No bootable partition");
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return -1;
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}
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i = m->map_index - 1;
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if (set_bootable(gpt, gpt->gpt, gpt->tbl, i) == -1)
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return -1;
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if (set_bootable(gpt, gpt->tpg, gpt->lbt, i) == -1)
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return -1;
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if (gpt_write(gpt, mbrmap) == -1) {
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gpt_warnx(gpt, "Cannot update Protective MBR");
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return -1;
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}
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gpt_msg(gpt, "Partition %d marked as bootable", i + 1);
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return 0;
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}
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static int
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cmd_biosboot(gpt_t gpt, int argc, char *argv[])
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{
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#ifdef USE_WEDGES
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struct dkwedge_info dkw;
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#endif
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int ch;
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gpt_t ngpt = gpt;
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daddr_t start = 0;
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uint64_t size = 0;
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int active = 0;
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unsigned int entry = 0;
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uint8_t *label = NULL;
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char *bootpath = NULL;
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while ((ch = getopt(argc, argv, "Ac:i:L:b:")) != -1) {
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switch(ch) {
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case 'A':
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active = 1;
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break;
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case 'c':
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if (gpt_name_get(gpt, &bootpath) == -1)
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goto usage;
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break;
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case 'i':
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if (gpt_uint_get(gpt, &entry) == -1)
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goto usage;
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break;
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case 'L':
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if (gpt_name_get(gpt, &label) == -1)
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goto usage;
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break;
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case 'b':
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if (gpt_human_get(gpt, &start) == -1)
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goto usage;
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break;
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default:
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goto usage;
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}
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}
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if (argc != optind)
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return usage();
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#ifdef USE_WEDGES
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if ((gpt->sb.st_mode & S_IFMT) != S_IFREG &&
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ioctl(gpt->fd, DIOCGWEDGEINFO, &dkw) != -1) {
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if (entry > 0)
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/* wedges and indexes are mutually exclusive */
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goto usage;
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start = dkw.dkw_offset;
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size = dkw.dkw_size;
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ngpt = gpt_open(dkw.dkw_parent, gpt->flags, gpt->verbose,
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0, 0, 0);
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if (ngpt == NULL)
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goto cleanup;
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}
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#endif
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if (biosboot(ngpt, start, size, entry, label, bootpath, active) == -1)
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goto cleanup;
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if (ngpt != gpt)
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gpt_close(ngpt);
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return 0;
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usage:
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usage();
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cleanup:
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if (ngpt != gpt)
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gpt_close(ngpt);
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free(bootpath);
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free(label);
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return -1;
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}
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