180 lines
4.5 KiB
C
180 lines
4.5 KiB
C
/*
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* Copyright (c) 2002 Marcel Moolenaar
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* All rights reserved.
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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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*
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/gpt.h>
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#include <err.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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int recoverable;
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static void
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usage_recover(void)
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{
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fprintf(stderr,
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"usage: %s device ...\n", getprogname());
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exit(1);
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}
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static void
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recover(int fd)
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{
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off_t last;
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map_t *gpt, *tpg;
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map_t *tbl, *lbt;
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struct gpt_hdr *hdr;
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if (map_find(MAP_TYPE_MBR) != NULL) {
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warnx("%s: error: device contains a MBR", device_name);
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return;
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}
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gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
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tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
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tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
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lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
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if (gpt == NULL && tpg == NULL) {
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warnx("%s: no primary or secondary GPT headers, can't recover",
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device_name);
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return;
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}
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if (tbl == NULL && lbt == NULL) {
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warnx("%s: no primary or secondary GPT tables, can't recover",
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device_name);
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return;
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}
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last = mediasz / secsz - 1LL;
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if (tbl != NULL && lbt == NULL) {
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lbt = map_add(last - tbl->map_size, tbl->map_size,
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MAP_TYPE_SEC_GPT_TBL, tbl->map_data);
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if (lbt == NULL) {
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warnx("%s: adding secondary GPT table failed",
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device_name);
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return;
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}
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gpt_write(fd, lbt);
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warnx("%s: recovered secondary GPT table from primary",
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device_name);
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} else if (tbl == NULL && lbt != NULL) {
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tbl = map_add(2LL, lbt->map_size, MAP_TYPE_PRI_GPT_TBL,
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lbt->map_data);
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if (tbl == NULL) {
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warnx("%s: adding primary GPT table failed",
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device_name);
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return;
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}
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gpt_write(fd, tbl);
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warnx("%s: recovered primary GPT table from secondary",
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device_name);
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}
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if (gpt != NULL && tpg == NULL) {
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tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR,
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calloc(1, secsz));
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if (tpg == NULL) {
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warnx("%s: adding secondary GPT header failed",
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device_name);
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return;
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}
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memcpy(tpg->map_data, gpt->map_data, secsz);
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hdr = tpg->map_data;
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hdr->hdr_lba_self = tpg->map_start;
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hdr->hdr_lba_alt = gpt->map_start;
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hdr->hdr_lba_table = lbt->map_start;
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hdr->hdr_crc_self = 0;
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hdr->hdr_crc_self = crc32(hdr, hdr->hdr_size);
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gpt_write(fd, tpg);
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warnx("%s: recovered secondary GPT header from primary",
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device_name);
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} else if (gpt == NULL && tpg != NULL) {
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gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR,
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calloc(1, secsz));
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if (gpt == NULL) {
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warnx("%s: adding primary GPT header failed",
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device_name);
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return;
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}
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memcpy(gpt->map_data, tpg->map_data, secsz);
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hdr = gpt->map_data;
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hdr->hdr_lba_self = gpt->map_start;
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hdr->hdr_lba_alt = tpg->map_start;
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hdr->hdr_lba_table = tbl->map_start;
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hdr->hdr_crc_self = 0;
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hdr->hdr_crc_self = crc32(hdr, hdr->hdr_size);
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gpt_write(fd, gpt);
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warnx("%s: recovered primary GPT header from secondary",
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device_name);
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}
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}
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int
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cmd_recover(int argc, char *argv[])
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{
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int ch, fd;
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while ((ch = getopt(argc, argv, "r")) != -1) {
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switch(ch) {
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case 'r':
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recoverable = 1;
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break;
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default:
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usage_recover();
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}
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}
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if (argc == optind)
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usage_recover();
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while (optind < argc) {
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fd = gpt_open(argv[optind++]);
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if (fd == -1) {
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warn("unable to open device '%s'", device_name);
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continue;
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}
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recover(fd);
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gpt_close(fd);
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}
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return (0);
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}
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