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 #if HAVE_NBTOOL_CONFIG_H 28 #include "nbtool_config.h" 29 #endif 30 31 #include <sys/cdefs.h> 32 #ifdef __FBSDID 33 __FBSDID("$FreeBSD: src/sbin/gpt/recover.c,v 1.8 2005/08/31 01:47:19 marcel Exp $"); 34 #endif 35 #ifdef __RCSID 36 __RCSID("$NetBSD: recover.c,v 1.5 2014/09/29 20:28:57 christos Exp $"); 37 #endif 38 39 #include <sys/types.h> 40 41 #include <err.h> 42 #include <stddef.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include "map.h" 49 #include "gpt.h" 50 51 static int recoverable; 52 53 const char recovermsg[] = "recover device ..."; 54 55 __dead static void 56 usage_recover(void) 57 { 58 59 fprintf(stderr, 60 "usage: %s %s\n", getprogname(), recovermsg); 61 exit(1); 62 } 63 64 static void 65 recover(int fd) 66 { 67 off_t last; 68 map_t *gpt, *tpg; 69 map_t *tbl, *lbt; 70 struct gpt_hdr *hdr; 71 72 if (map_find(MAP_TYPE_MBR) != NULL) { 73 warnx("%s: error: device contains a MBR", device_name); 74 return; 75 } 76 77 gpt = map_find(MAP_TYPE_PRI_GPT_HDR); 78 tpg = map_find(MAP_TYPE_SEC_GPT_HDR); 79 tbl = map_find(MAP_TYPE_PRI_GPT_TBL); 80 lbt = map_find(MAP_TYPE_SEC_GPT_TBL); 81 82 if (gpt == NULL && tpg == NULL) { 83 warnx("%s: no primary or secondary GPT headers, can't recover", 84 device_name); 85 return; 86 } 87 if (tbl == NULL && lbt == NULL) { 88 warnx("%s: no primary or secondary GPT tables, can't recover", 89 device_name); 90 return; 91 } 92 93 last = mediasz / secsz - 1LL; 94 95 if (tbl != NULL && lbt == NULL) { 96 lbt = map_add(last - tbl->map_size, tbl->map_size, 97 MAP_TYPE_SEC_GPT_TBL, tbl->map_data); 98 if (lbt == NULL) { 99 warnx("%s: adding secondary GPT table failed", 100 device_name); 101 return; 102 } 103 gpt_write(fd, lbt); 104 warnx("%s: recovered secondary GPT table from primary", 105 device_name); 106 } else if (tbl == NULL && lbt != NULL) { 107 tbl = map_add(2LL, lbt->map_size, MAP_TYPE_PRI_GPT_TBL, 108 lbt->map_data); 109 if (tbl == NULL) { 110 warnx("%s: adding primary GPT table failed", 111 device_name); 112 return; 113 } 114 gpt_write(fd, tbl); 115 warnx("%s: recovered primary GPT table from secondary", 116 device_name); 117 } 118 119 if (gpt != NULL && tpg == NULL) { 120 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, 121 calloc(1, secsz)); 122 if (tpg == NULL) { 123 warnx("%s: adding secondary GPT header failed", 124 device_name); 125 return; 126 } 127 memcpy(tpg->map_data, gpt->map_data, secsz); 128 hdr = tpg->map_data; 129 hdr->hdr_lba_self = htole64(tpg->map_start); 130 hdr->hdr_lba_alt = htole64(gpt->map_start); 131 hdr->hdr_lba_table = htole64(lbt->map_start); 132 hdr->hdr_crc_self = 0; 133 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 134 gpt_write(fd, tpg); 135 warnx("%s: recovered secondary GPT header from primary", 136 device_name); 137 } else if (gpt == NULL && tpg != NULL) { 138 gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, 139 calloc(1, secsz)); 140 if (gpt == NULL) { 141 warnx("%s: adding primary GPT header failed", 142 device_name); 143 return; 144 } 145 memcpy(gpt->map_data, tpg->map_data, secsz); 146 hdr = gpt->map_data; 147 hdr->hdr_lba_self = htole64(gpt->map_start); 148 hdr->hdr_lba_alt = htole64(tpg->map_start); 149 hdr->hdr_lba_table = htole64(tbl->map_start); 150 hdr->hdr_crc_self = 0; 151 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 152 gpt_write(fd, gpt); 153 warnx("%s: recovered primary GPT header from secondary", 154 device_name); 155 } 156 } 157 158 int 159 cmd_recover(int argc, char *argv[]) 160 { 161 int ch, fd; 162 163 while ((ch = getopt(argc, argv, "r")) != -1) { 164 switch(ch) { 165 case 'r': 166 recoverable = 1; 167 break; 168 default: 169 usage_recover(); 170 } 171 } 172 173 if (argc == optind) 174 usage_recover(); 175 176 while (optind < argc) { 177 fd = gpt_open(argv[optind++]); 178 if (fd == -1) { 179 warn("unable to open device '%s'", device_name); 180 continue; 181 } 182 183 recover(fd); 184 185 gpt_close(fd); 186 } 187 188 return (0); 189 } 190