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 1.15 2015/12/04 16:46:24 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 #include "gpt_private.h" 51 52 static int cmd_recover(gpt_t, int, char *[]); 53 54 static const char *recoverhelp[] = { 55 "", 56 }; 57 58 struct gpt_cmd c_recover = { 59 "recover", 60 cmd_recover, 61 recoverhelp, __arraycount(recoverhelp), 62 0, 63 }; 64 65 #define usage() gpt_usage(NULL, &c_recover) 66 67 static int 68 recover_gpt_hdr(gpt_t gpt, int type, off_t last) 69 { 70 const char *name, *origname; 71 map_t *dgpt, dtbl, sgpt, stbl; 72 struct gpt_hdr *hdr; 73 74 if (gpt_add_hdr(gpt, type, last) == -1) 75 return -1; 76 77 switch (type) { 78 case MAP_TYPE_PRI_GPT_HDR: 79 dgpt = &gpt->gpt; 80 dtbl = gpt->tbl; 81 sgpt = gpt->tpg; 82 stbl = gpt->lbt; 83 origname = "secondary"; 84 name = "primary"; 85 break; 86 case MAP_TYPE_SEC_GPT_HDR: 87 dgpt = &gpt->tpg; 88 dtbl = gpt->lbt; 89 sgpt = gpt->gpt; 90 stbl = gpt->tbl; 91 origname = "primary"; 92 name = "secondary"; 93 break; 94 default: 95 gpt_warn(gpt, "Bad table type %d", type); 96 return -1; 97 } 98 99 memcpy((*dgpt)->map_data, sgpt->map_data, gpt->secsz); 100 hdr = (*dgpt)->map_data; 101 hdr->hdr_lba_self = htole64((uint64_t)(*dgpt)->map_start); 102 hdr->hdr_lba_alt = htole64((uint64_t)stbl->map_start); 103 hdr->hdr_lba_table = htole64((uint64_t)dtbl->map_start); 104 hdr->hdr_crc_self = 0; 105 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); 106 if (gpt_write(gpt, *dgpt) == -1) { 107 gpt_warnx(gpt, "Writing %s GPT header failed", name); 108 return -1; 109 } 110 gpt_msg(gpt, "Recovered %s GPT header from %s", name, origname); 111 return 0; 112 } 113 114 static int 115 recover_gpt_tbl(gpt_t gpt, int type, off_t start) 116 { 117 const char *name, *origname; 118 map_t *dtbl, stbl; 119 120 switch (type) { 121 case MAP_TYPE_PRI_GPT_TBL: 122 dtbl = &gpt->tbl; 123 stbl = gpt->lbt; 124 origname = "secondary"; 125 name = "primary"; 126 break; 127 case MAP_TYPE_SEC_GPT_TBL: 128 dtbl = &gpt->lbt; 129 stbl = gpt->tbl; 130 origname = "primary"; 131 name = "secondary"; 132 break; 133 default: 134 gpt_warn(gpt, "Bad table type %d", type); 135 return -1; 136 } 137 138 *dtbl = map_add(gpt, start, stbl->map_size, type, stbl->map_data, 0); 139 if (*dtbl == NULL) { 140 gpt_warnx(gpt, "Adding %s GPT table failed", name); 141 return -1; 142 } 143 if (gpt_write(gpt, *dtbl) == -1) { 144 gpt_warnx(gpt, "Writing %s GPT table failed", name); 145 return -1; 146 } 147 gpt_msg(gpt, "Recovered %s GPT table from %s", name, origname); 148 return 0; 149 } 150 151 static int 152 recover(gpt_t gpt, int recoverable) 153 { 154 uint64_t last; 155 156 if (map_find(gpt, MAP_TYPE_MBR) != NULL) { 157 gpt_warnx(gpt, "Device contains an MBR"); 158 return -1; 159 } 160 161 gpt->gpt = map_find(gpt, MAP_TYPE_PRI_GPT_HDR); 162 gpt->tpg = map_find(gpt, MAP_TYPE_SEC_GPT_HDR); 163 gpt->tbl = map_find(gpt, MAP_TYPE_PRI_GPT_TBL); 164 gpt->lbt = map_find(gpt, MAP_TYPE_SEC_GPT_TBL); 165 166 if (gpt->gpt == NULL && gpt->tpg == NULL) { 167 gpt_warnx(gpt, "No primary or secondary GPT headers, " 168 "can't recover"); 169 return -1; 170 } 171 if (gpt->tbl == NULL && gpt->lbt == NULL) { 172 gpt_warnx(gpt, "No primary or secondary GPT tables, " 173 "can't recover"); 174 return -1; 175 } 176 177 last = (uint64_t)(gpt->mediasz / gpt->secsz - 1LL); 178 179 if (gpt->gpt != NULL && 180 ((struct gpt_hdr *)(gpt->gpt->map_data))->hdr_lba_alt != last) { 181 gpt_warnx(gpt, "Media size has changed, please use " 182 "'%s resizedisk'", getprogname()); 183 return -1; 184 } 185 186 if (gpt->tbl != NULL && gpt->lbt == NULL) { 187 if (recover_gpt_tbl(gpt, MAP_TYPE_SEC_GPT_TBL, 188 (off_t)last - gpt->tbl->map_size) == -1) 189 return -1; 190 } else if (gpt->tbl == NULL && gpt->lbt != NULL) { 191 if (recover_gpt_tbl(gpt, MAP_TYPE_PRI_GPT_TBL, 2LL) == -1) 192 return -1; 193 } 194 195 if (gpt->gpt != NULL && gpt->tpg == NULL) { 196 if (recover_gpt_hdr(gpt, MAP_TYPE_SEC_GPT_HDR, 197 (off_t)last) == -1) 198 return -1; 199 } else if (gpt->gpt == NULL && gpt->tpg != NULL) { 200 if (recover_gpt_hdr(gpt, MAP_TYPE_PRI_GPT_HDR, 1LL) == -1) 201 return -1; 202 } 203 return 0; 204 } 205 206 static int 207 cmd_recover(gpt_t gpt, int argc, char *argv[]) 208 { 209 int ch; 210 int recoverable = 0; 211 212 while ((ch = getopt(argc, argv, "r")) != -1) { 213 switch(ch) { 214 case 'r': 215 recoverable = 1; 216 break; 217 default: 218 return usage(); 219 } 220 } 221 222 if (argc != optind) 223 return usage(); 224 225 return recover(gpt, recoverable); 226 } 227