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NetBSD/sbin/gpt/restore.c

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/*-
* Copyright (c) 2002 Marcel Moolenaar
* 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>
#ifdef __FBSDID
__FBSDID("$FreeBSD: src/sbin/gpt/create.c,v 1.11 2005/08/31 01:47:19 marcel Exp $");
#endif
#ifdef __RCSID
__RCSID("$NetBSD: restore.c,v 1.20 2020/06/07 05:42:25 thorpej Exp $");
#endif
#include <sys/types.h>
#include <sys/bootblock.h>
#include <sys/disklabel_gpt.h>
#include <err.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <prop/proplib.h>
#include "map.h"
#include "gpt.h"
#include "gpt_private.h"
static int cmd_restore(gpt_t, int, char *[]);
static const char *restorehelp[] = {
"[-F] [-i infile]",
};
struct gpt_cmd c_restore = {
"restore",
cmd_restore,
restorehelp, __arraycount(restorehelp),
GPT_SYNC,
};
#define usage() gpt_usage(NULL, &c_restore)
#define PROP_ERR(x) if (!(x)) { \
gpt_warnx(gpt, "proplib failure"); \
return -1; \
}
static int
restore_mbr(gpt_t gpt, struct mbr *mbr, prop_dictionary_t mbr_dict, off_t last)
{
unsigned int i;
struct mbr_part *part;
PROP_ERR(prop_dictionary_get_uint(mbr_dict, "index", &i));
part = &mbr->mbr_part[i];
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "flag", &part->part_flag));
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "start_head",
&part->part_shd));
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "start_sector",
&part->part_ssect ));
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "start_cylinder",
&part->part_scyl));
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "type",
&part->part_typ));
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "end_head",
&part->part_ehd));
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "end_sector",
&part->part_esect));
PROP_ERR(prop_dictionary_get_uint8(mbr_dict, "end_cylinder",
&part->part_ecyl));
PROP_ERR(prop_dictionary_get_uint16(mbr_dict, "lba_start_low",
&part->part_start_lo));
part->part_start_lo = htole16(part->part_start_lo);
PROP_ERR(prop_dictionary_get_uint16(mbr_dict, "lba_start_high",
&part->part_start_hi));
part->part_start_hi = htole16(part->part_start_hi);
/* adjust PMBR size to size of device */
if (part->part_typ == MBR_PTYPE_PMBR) {
if (last > 0xffffffff) {
mbr->mbr_part[0].part_size_lo = htole16(0xffff);
mbr->mbr_part[0].part_size_hi = htole16(0xffff);
} else {
mbr->mbr_part[0].part_size_lo = htole16((uint16_t)last);
mbr->mbr_part[0].part_size_hi = htole16(
(uint16_t)(last >> 16));
}
} else {
PROP_ERR(prop_dictionary_get_uint16(mbr_dict, "lba_size_low",
&part->part_size_lo));
part->part_size_lo = htole16(part->part_size_lo);
PROP_ERR(prop_dictionary_get_uint16(mbr_dict, "lba_size_high",
&part->part_size_hi));
part->part_size_hi = htole16(part->part_size_hi);
}
return 0;
}
static int
restore_ent(gpt_t gpt, prop_dictionary_t gpt_dict, void *secbuf, u_int gpt_size,
u_int entries)
{
unsigned int i;
struct gpt_ent ent;
const char *s;
memset(&ent, 0, sizeof(ent));
PROP_ERR(prop_dictionary_get_string(gpt_dict, "type", &s));
if (gpt_uuid_parse(s, ent.ent_type) != 0) {
gpt_warnx(gpt, "%s: not able to convert to an UUID", s);
return -1;
}
PROP_ERR(prop_dictionary_get_string(gpt_dict, "guid", &s));
if (gpt_uuid_parse(s, ent.ent_guid) != 0) {
gpt_warnx(gpt, "%s: not able to convert to an UUID", s);
return -1;
}
PROP_ERR(prop_dictionary_get_uint64(gpt_dict, "start",
&ent.ent_lba_start));
ent.ent_lba_start = htole64(ent.ent_lba_start);
PROP_ERR(prop_dictionary_get_uint64(gpt_dict, "end",
&ent.ent_lba_end));
ent.ent_lba_end = htole64(ent.ent_lba_end);
PROP_ERR(prop_dictionary_get_uint64(gpt_dict, "attributes",
&ent.ent_attr));
ent.ent_attr = htole64(ent.ent_attr);
if (prop_dictionary_get_string(gpt_dict, "name", &s)) {
utf8_to_utf16((const uint8_t *)s, ent.ent_name,
__arraycount(ent.ent_name));
}
PROP_ERR(prop_dictionary_get_uint(gpt_dict, "index", &i));
if (i > entries) {
gpt_warnx(gpt, "Entity index out of bounds %u > %u\n",
i, entries);
return -1;
}
memcpy((char *)secbuf + gpt->secsz + ((i - 1) * sizeof(ent)),
&ent, sizeof(ent));
return 0;
}
static int
restore(gpt_t gpt, const char *infile, int force)
{
gpt_uuid_t gpt_guid, uuid;
off_t firstdata, last, lastdata, gpe_start, gpe_end;
map_t map;
struct mbr *mbr;
struct gpt_hdr *hdr;
unsigned int i, gpt_size;
prop_dictionary_t props, gpt_dict, mbr_dict, type_dict;
prop_object_iterator_t propiter;
prop_data_t propdata;
prop_array_t mbr_array, gpt_array;
prop_number_t propnum;
unsigned int entries;
const char *s;
void *secbuf = NULL;
int rv = -1;
last = gpt->mediasz / gpt->secsz - 1LL;
if (map_find(gpt, MAP_TYPE_PRI_GPT_HDR) != NULL ||
map_find(gpt, MAP_TYPE_SEC_GPT_HDR) != NULL) {
if (!force) {
gpt_warnx(gpt, "Device contains a GPT");
return -1;
}
}
map = map_find(gpt, MAP_TYPE_MBR);
if (map != NULL) {
if (!force) {
gpt_warnx(gpt, "Device contains an MBR");
return -1;
}
/* Nuke the MBR in our internal map. */
map->map_type = MAP_TYPE_UNUSED;
}
props = prop_dictionary_internalize_from_file(
strcmp(infile, "-") == 0 ? "/dev/stdin" : infile);
if (props == NULL) {
gpt_warnx(gpt, "Unable to read/parse backup file");
return -1;
}
propnum = prop_dictionary_get(props, "sector_size");
PROP_ERR(propnum);
if (!prop_number_equals_signed(propnum, gpt->secsz)) {
gpt_warnx(gpt, "Sector size does not match backup");
prop_object_release(props);
return -1;
}
gpt_dict = prop_dictionary_get(props, "GPT_HDR");
PROP_ERR(gpt_dict);
propnum = prop_dictionary_get(gpt_dict, "revision");
PROP_ERR(propnum);
if (!prop_number_equals_unsigned(propnum, 0x10000)) {
gpt_warnx(gpt, "backup is not revision 1.0");
prop_object_release(gpt_dict);
prop_object_release(props);
return -1;
}
PROP_ERR(prop_dictionary_get_uint(gpt_dict, "entries", &entries));
gpt_size = (u_int)(entries * sizeof(struct gpt_ent) / gpt->secsz);
if (gpt_size * sizeof(struct gpt_ent) % gpt->secsz)
gpt_size++;
PROP_ERR(prop_dictionary_get_string(gpt_dict, "guid", &s));
if (gpt_uuid_parse(s, gpt_guid) != 0) {
gpt_warnx(gpt, "%s: not able to convert to an UUID", s);
goto out;
}
firstdata = gpt_size + 2; /* PMBR and GPT header */
lastdata = last - gpt_size - 1; /* alt. GPT table and header */
type_dict = prop_dictionary_get(props, "GPT_TBL");
PROP_ERR(type_dict);
gpt_array = prop_dictionary_get(type_dict, "gpt_array");
PROP_ERR(gpt_array);
propiter = prop_array_iterator(gpt_array);
PROP_ERR(propiter);
while ((gpt_dict = prop_object_iterator_next(propiter)) != NULL) {
PROP_ERR(prop_dictionary_get_string(gpt_dict, "type", &s));
if (gpt_uuid_parse(s, uuid) != 0) {
gpt_warnx(gpt, "%s: not able to convert to an UUID", s);
goto out;
}
if (gpt_uuid_is_nil(uuid))
continue;
PROP_ERR(prop_dictionary_get_int64(gpt_dict, "start",
&gpe_start));
PROP_ERR(prop_dictionary_get_int64(gpt_dict, "end",
&gpe_end));
if (gpe_start < firstdata || gpe_end > lastdata) {
gpt_warnx(gpt, "Backup GPT doesn't fit");
goto out;
}
}
prop_object_iterator_release(propiter);
/* GPT TABLE + GPT HEADER */
if ((secbuf = calloc(gpt_size + 1, gpt->secsz)) == NULL) {
gpt_warn(gpt, "not enough memory to create a sector buffer");
goto out;
}
if (lseek(gpt->fd, 0LL, SEEK_SET) == -1) {
gpt_warn(gpt, "Can't seek to beginning");
goto out;
}
for (i = 0; i < firstdata; i++) {
if (write(gpt->fd, secbuf, gpt->secsz) != (ssize_t)gpt->secsz) {
gpt_warn(gpt, "Error writing");
goto out;
}
}
if (lseek(gpt->fd, (lastdata + 1) * gpt->secsz, SEEK_SET) == -1) {
gpt_warn(gpt, "Can't seek to end");
goto out;
}
for (i = (u_int)(lastdata + 1); i <= (u_int)last; i++) {
if (write(gpt->fd, secbuf, gpt->secsz) != (ssize_t)gpt->secsz) {
gpt_warn(gpt, "Error writing");
goto out;
}
}
mbr = secbuf;
type_dict = prop_dictionary_get(props, "MBR");
PROP_ERR(type_dict);
propdata = prop_dictionary_get(type_dict, "code");
PROP_ERR(propdata);
memcpy(mbr->mbr_code, prop_data_value(propdata),
sizeof(mbr->mbr_code));
mbr_array = prop_dictionary_get(type_dict, "mbr_array");
PROP_ERR(mbr_array);
propiter = prop_array_iterator(mbr_array);
PROP_ERR(propiter);
while ((mbr_dict = prop_object_iterator_next(propiter)) != NULL) {
if (restore_mbr(gpt, mbr, mbr_dict, last) == -1)
goto out;
}
prop_object_iterator_release(propiter);
mbr->mbr_sig = htole16(MBR_SIG);
if (lseek(gpt->fd, 0LL, SEEK_SET) == -1 ||
write(gpt->fd, mbr, gpt->secsz) != (ssize_t)gpt->secsz) {
gpt_warn(gpt, "Unable to seek/write MBR");
return -1;
}
propiter = prop_array_iterator(gpt_array);
PROP_ERR(propiter);
while ((gpt_dict = prop_object_iterator_next(propiter)) != NULL) {
if (restore_ent(gpt, gpt_dict, secbuf, gpt_size, entries) == -1)
goto out;
}
prop_object_iterator_release(propiter);
size_t len = gpt_size * gpt->secsz;
if (lseek(gpt->fd, 2 * gpt->secsz, SEEK_SET) == -1 ||
write(gpt->fd, (char *)secbuf + gpt->secsz, len) != (ssize_t) len) {
gpt_warn(gpt, "Unable to write primary GPT");
goto out;
}
if (lseek(gpt->fd, (lastdata + 1) * gpt->secsz, SEEK_SET) == -1 ||
write(gpt->fd, (char *)secbuf + gpt->secsz, len) != (ssize_t) len) {
gpt_warn(gpt, "Unable to write secondary GPT");
goto out;
}
memset(secbuf, 0, gpt->secsz);
hdr = secbuf;
memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
hdr->hdr_revision = htole32(GPT_HDR_REVISION);
hdr->hdr_size = htole32(GPT_HDR_SIZE);
hdr->hdr_lba_self = htole64(GPT_HDR_BLKNO);
hdr->hdr_lba_alt = htole64((uint64_t)last);
hdr->hdr_lba_start = htole64((uint64_t)firstdata);
hdr->hdr_lba_end = htole64((uint64_t)lastdata);
gpt_uuid_copy(hdr->hdr_guid, gpt_guid);
hdr->hdr_lba_table = htole64(2);
hdr->hdr_entries = htole32(entries);
hdr->hdr_entsz = htole32(sizeof(struct gpt_ent));
hdr->hdr_crc_table = htole32(crc32((char *)secbuf + gpt->secsz, len));
hdr->hdr_crc_self = htole32(crc32(hdr, GPT_HDR_SIZE));
if (lseek(gpt->fd, gpt->secsz, SEEK_SET) == -1 ||
write(gpt->fd, hdr, gpt->secsz) != (ssize_t)gpt->secsz) {
gpt_warn(gpt, "Unable to write primary header");
goto out;
}
hdr->hdr_lba_self = htole64((uint64_t)last);
hdr->hdr_lba_alt = htole64(GPT_HDR_BLKNO);
hdr->hdr_lba_table = htole64((uint64_t)(lastdata + 1));
hdr->hdr_crc_self = 0;
hdr->hdr_crc_self = htole32(crc32(hdr, GPT_HDR_SIZE));
if (lseek(gpt->fd, last * gpt->secsz, SEEK_SET) == -1 ||
write(gpt->fd, hdr, gpt->secsz) != (ssize_t)gpt->secsz) {
gpt_warn(gpt, "Unable to write secondary header");
goto out;
}
rv = 0;
out:
free(secbuf);
prop_object_release(props);
return rv;
}
static int
cmd_restore(gpt_t gpt, int argc, char *argv[])
{
int ch;
int force = 0;
const char *infile = "-";
while ((ch = getopt(argc, argv, "Fi:")) != -1) {
switch(ch) {
case 'i':
infile = optarg;
break;
case 'F':
force = 1;
break;
default:
return usage();
}
}
if (argc != optind)
return usage();
return restore(gpt, infile, force);
}
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