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 static void 50 usage_recover(void) 51 { 52 53 fprintf(stderr, 54 "usage: %s device ...\n", getprogname()); 55 exit(1); 56 } 57 58 static void 59 recover(int fd) 60 { 61 off_t last; 62 map_t *gpt, *tpg; 63 map_t *tbl, *lbt; 64 struct gpt_hdr *hdr; 65 66 if (map_find(MAP_TYPE_MBR) != NULL) { 67 warnx("%s: error: device contains a MBR", device_name); 68 return; 69 } 70 71 gpt = map_find(MAP_TYPE_PRI_GPT_HDR); 72 tpg = map_find(MAP_TYPE_SEC_GPT_HDR); 73 tbl = map_find(MAP_TYPE_PRI_GPT_TBL); 74 lbt = map_find(MAP_TYPE_SEC_GPT_TBL); 75 76 if (gpt == NULL && tpg == NULL) { 77 warnx("%s: no primary or secondary GPT headers, can't recover", 78 device_name); 79 return; 80 } 81 if (tbl == NULL && lbt == NULL) { 82 warnx("%s: no primary or secondary GPT tables, can't recover", 83 device_name); 84 return; 85 } 86 87 last = mediasz / secsz - 1LL; 88 89 if (tbl != NULL && lbt == NULL) { 90 lbt = map_add(last - tbl->map_size, tbl->map_size, 91 MAP_TYPE_SEC_GPT_TBL, tbl->map_data); 92 if (lbt == NULL) { 93 warnx("%s: adding secondary GPT table failed", 94 device_name); 95 return; 96 } 97 gpt_write(fd, lbt); 98 warnx("%s: recovered secondary GPT table from primary", 99 device_name); 100 } else if (tbl == NULL && lbt != NULL) { 101 tbl = map_add(2LL, lbt->map_size, MAP_TYPE_PRI_GPT_TBL, 102 lbt->map_data); 103 if (tbl == NULL) { 104 warnx("%s: adding primary GPT table failed", 105 device_name); 106 return; 107 } 108 gpt_write(fd, tbl); 109 warnx("%s: recovered primary GPT table from secondary", 110 device_name); 111 } 112 113 if (gpt != NULL && tpg == NULL) { 114 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, 115 calloc(1, secsz)); 116 if (tpg == NULL) { 117 warnx("%s: adding secondary GPT header failed", 118 device_name); 119 return; 120 } 121 memcpy(tpg->map_data, gpt->map_data, secsz); 122 hdr = tpg->map_data; 123 hdr->hdr_lba_self = htole64(tpg->map_start); 124 hdr->hdr_lba_alt = htole64(gpt->map_start); 125 hdr->hdr_lba_table = htole64(lbt->map_start); 126 hdr->hdr_crc_self = 0; 127 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 128 gpt_write(fd, tpg); 129 warnx("%s: recovered secondary GPT header from primary", 130 device_name); 131 } else if (gpt == NULL && tpg != NULL) { 132 gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, 133 calloc(1, secsz)); 134 if (gpt == NULL) { 135 warnx("%s: adding primary GPT header failed", 136 device_name); 137 return; 138 } 139 memcpy(gpt->map_data, tpg->map_data, secsz); 140 hdr = gpt->map_data; 141 hdr->hdr_lba_self = htole64(gpt->map_start); 142 hdr->hdr_lba_alt = htole64(tpg->map_start); 143 hdr->hdr_lba_table = htole64(tbl->map_start); 144 hdr->hdr_crc_self = 0; 145 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 146 gpt_write(fd, gpt); 147 warnx("%s: recovered primary GPT header from secondary", 148 device_name); 149 } 150 } 151 152 int 153 cmd_recover(int argc, char *argv[]) 154 { 155 int ch, fd; 156 157 while ((ch = getopt(argc, argv, "r")) != -1) { 158 switch(ch) { 159 case 'r': 160 recoverable = 1; 161 break; 162 default: 163 usage_recover(); 164 } 165 } 166 167 if (argc == optind) 168 usage_recover(); 169 170 while (optind < argc) { 171 fd = gpt_open(argv[optind++]); 172 if (fd == -1) { 173 warn("unable to open device '%s'", device_name); 174 continue; 175 } 176 177 recover(fd); 178 179 gpt_close(fd); 180 } 181 182 return (0); 183 } 184