sbin/gpt/recover.c

   1 /*-
   2  * Copyright (c) 2002 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 #ifdef __FBSDID
  29 __FBSDID("$FreeBSD: src/sbin/gpt/recover.c,v 1.8 2005/08/31 01:47:19 marcel Exp $");
  30 #endif
  31 #ifdef __RCSID
  32 __RCSID("$NetBSD: recover.c,v 1.2 2006/10/15 22:36:29 christos Exp $");
  33 #endif
  34
  35 #include <sys/types.h>
  36
  37 #include <err.h>
  38 #include <stddef.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #include "map.h"
  45 #include "gpt.h"
  46
  47 static int recoverable;
  48
  49 const char recovermsg[] = "recover device ...";
  50
  51 static void
  52 usage_recover(void)
  53 {
  54
  55         fprintf(stderr,
  56             "usage: %s %s\n", getprogname(), recovermsg);
  57         exit(1);
  58 }
  59
  60 static void
  61 recover(int fd)
  62 {
  63         off_t last;
  64         map_t *gpt, *tpg;
  65         map_t *tbl, *lbt;
  66         struct gpt_hdr *hdr;
  67
  68         if (map_find(MAP_TYPE_MBR) != NULL) {
  69                 warnx("%s: error: device contains a MBR", device_name);
  70                 return;
  71         }
  72
  73         gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
  74         tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
  75         tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
  76         lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
  77
  78         if (gpt == NULL && tpg == NULL) {
  79                 warnx("%s: no primary or secondary GPT headers, can't recover",
  80                     device_name);
  81                 return;
  82         }
  83         if (tbl == NULL && lbt == NULL) {
  84                 warnx("%s: no primary or secondary GPT tables, can't recover",
  85                     device_name);
  86                 return;
  87         }
  88
  89         last = mediasz / secsz - 1LL;
  90
  91         if (tbl != NULL && lbt == NULL) {
  92                 lbt = map_add(last - tbl->map_size, tbl->map_size,
  93                     MAP_TYPE_SEC_GPT_TBL, tbl->map_data);
  94                 if (lbt == NULL) {
  95                         warnx("%s: adding secondary GPT table failed",
  96                             device_name);
  97                         return;
  98                 }
  99                 gpt_write(fd, lbt);
 100                 warnx("%s: recovered secondary GPT table from primary",
 101                     device_name);
 102         } else if (tbl == NULL && lbt != NULL) {
 103                 tbl = map_add(2LL, lbt->map_size, MAP_TYPE_PRI_GPT_TBL,
 104                     lbt->map_data);
 105                 if (tbl == NULL) {
 106                         warnx("%s: adding primary GPT table failed",
 107                             device_name);
 108                         return;
 109                 }
 110                 gpt_write(fd, tbl);
 111                 warnx("%s: recovered primary GPT table from secondary",
 112                     device_name);
 113         }
 114
 115         if (gpt != NULL && tpg == NULL) {
 116                 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR,
 117                     calloc(1, secsz));
 118                 if (tpg == NULL) {
 119                         warnx("%s: adding secondary GPT header failed",
 120                             device_name);
 121                         return;
 122                 }
 123                 memcpy(tpg->map_data, gpt->map_data, secsz);
 124                 hdr = tpg->map_data;
 125                 hdr->hdr_lba_self = htole64(tpg->map_start);
 126                 hdr->hdr_lba_alt = htole64(gpt->map_start);
 127                 hdr->hdr_lba_table = htole64(lbt->map_start);
 128                 hdr->hdr_crc_self = 0;
 129                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 130                 gpt_write(fd, tpg);
 131                 warnx("%s: recovered secondary GPT header from primary",
 132                     device_name);
 133         } else if (gpt == NULL && tpg != NULL) {
 134                 gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR,
 135                     calloc(1, secsz));
 136                 if (gpt == NULL) {
 137                         warnx("%s: adding primary GPT header failed",
 138                             device_name);
 139                         return;
 140                 }
 141                 memcpy(gpt->map_data, tpg->map_data, secsz);
 142                 hdr = gpt->map_data;
 143                 hdr->hdr_lba_self = htole64(gpt->map_start);
 144                 hdr->hdr_lba_alt = htole64(tpg->map_start);
 145                 hdr->hdr_lba_table = htole64(tbl->map_start);
 146                 hdr->hdr_crc_self = 0;
 147                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 148                 gpt_write(fd, gpt);
 149                 warnx("%s: recovered primary GPT header from secondary",
 150                     device_name);
 151         }
 152 }
 153
 154 int
 155 cmd_recover(int argc, char *argv[])
 156 {
 157         int ch, fd;
 158
 159         while ((ch = getopt(argc, argv, "r")) != -1) {
 160                 switch(ch) {
 161                 case 'r':
 162                         recoverable = 1;
 163                         break;
 164                 default:
 165                         usage_recover();
 166                 }
 167         }
 168
 169         if (argc == optind)
 170                 usage_recover();
 171
 172         while (optind < argc) {
 173                 fd = gpt_open(argv[optind++]);
 174                 if (fd == -1) {
 175                         warn("unable to open device '%s'", device_name);
 176                         continue;
 177                 }
 178
 179                 recover(fd);
 180
 181                 gpt_close(fd);
 182         }
 183
 184         return (0);
 185 }