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 * $FreeBSD: src/sbin/gpt/recover.c,v 1.8 2005/08/31 01:47:19 marcel Exp $ 27 * $DragonFly: src/sbin/gpt/recover.c,v 1.1 2007/06/16 22:29:27 dillon Exp $ 28 */ 29 30 #include <sys/types.h> 31 32 #include <err.h> 33 #include <stddef.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 #include "map.h" 40 #include "gpt.h" 41 42 static int recoverable; 43 44 static void 45 usage_recover(void) 46 { 47 48 fprintf(stderr, 49 "usage: %s device ...\n", getprogname()); 50 exit(1); 51 } 52 53 static void 54 recover(int fd) 55 { 56 off_t last; 57 map_t *gpt, *tpg; 58 map_t *tbl, *lbt; 59 struct gpt_hdr *hdr; 60 61 if (map_find(MAP_TYPE_MBR) != NULL) { 62 warnx("%s: error: device contains a MBR", device_name); 63 return; 64 } 65 66 gpt = map_find(MAP_TYPE_PRI_GPT_HDR); 67 tpg = map_find(MAP_TYPE_SEC_GPT_HDR); 68 tbl = map_find(MAP_TYPE_PRI_GPT_TBL); 69 lbt = map_find(MAP_TYPE_SEC_GPT_TBL); 70 71 if (gpt == NULL && tpg == NULL) { 72 warnx("%s: no primary or secondary GPT headers, can't recover", 73 device_name); 74 return; 75 } 76 if (tbl == NULL && lbt == NULL) { 77 warnx("%s: no primary or secondary GPT tables, can't recover", 78 device_name); 79 return; 80 } 81 82 last = mediasz / secsz - 1LL; 83 84 if (tbl != NULL && lbt == NULL) { 85 lbt = map_add(last - tbl->map_size, tbl->map_size, 86 MAP_TYPE_SEC_GPT_TBL, tbl->map_data); 87 if (lbt == NULL) { 88 warnx("%s: adding secondary GPT table failed", 89 device_name); 90 return; 91 } 92 gpt_write(fd, lbt); 93 warnx("%s: recovered secondary GPT table from primary", 94 device_name); 95 } else if (tbl == NULL && lbt != NULL) { 96 tbl = map_add(2LL, lbt->map_size, MAP_TYPE_PRI_GPT_TBL, 97 lbt->map_data); 98 if (tbl == NULL) { 99 warnx("%s: adding primary GPT table failed", 100 device_name); 101 return; 102 } 103 gpt_write(fd, tbl); 104 warnx("%s: recovered primary GPT table from secondary", 105 device_name); 106 } 107 108 if (gpt != NULL && tpg == NULL) { 109 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, 110 calloc(1, secsz)); 111 if (tpg == NULL) { 112 warnx("%s: adding secondary GPT header failed", 113 device_name); 114 return; 115 } 116 memcpy(tpg->map_data, gpt->map_data, secsz); 117 hdr = tpg->map_data; 118 hdr->hdr_lba_self = htole64(tpg->map_start); 119 hdr->hdr_lba_alt = htole64(gpt->map_start); 120 hdr->hdr_lba_table = htole64(lbt->map_start); 121 hdr->hdr_crc_self = 0; 122 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 123 gpt_write(fd, tpg); 124 warnx("%s: recovered secondary GPT header from primary", 125 device_name); 126 } else if (gpt == NULL && tpg != NULL) { 127 gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, 128 calloc(1, secsz)); 129 if (gpt == NULL) { 130 warnx("%s: adding primary GPT header failed", 131 device_name); 132 return; 133 } 134 memcpy(gpt->map_data, tpg->map_data, secsz); 135 hdr = gpt->map_data; 136 hdr->hdr_lba_self = htole64(gpt->map_start); 137 hdr->hdr_lba_alt = htole64(tpg->map_start); 138 hdr->hdr_lba_table = htole64(tbl->map_start); 139 hdr->hdr_crc_self = 0; 140 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 141 gpt_write(fd, gpt); 142 warnx("%s: recovered primary GPT header from secondary", 143 device_name); 144 } 145 } 146 147 int 148 cmd_recover(int argc, char *argv[]) 149 { 150 int ch, fd; 151 152 while ((ch = getopt(argc, argv, "r")) != -1) { 153 switch(ch) { 154 case 'r': 155 recoverable = 1; 156 break; 157 default: 158 usage_recover(); 159 } 160 } 161 162 if (argc == optind) 163 usage_recover(); 164 165 while (optind < argc) { 166 fd = gpt_open(argv[optind++]); 167 if (fd == -1) { 168 warn("unable to open device '%s'", device_name); 169 continue; 170 } 171 172 recover(fd); 173 174 gpt_close(fd); 175 } 176 177 return (0); 178 } 179