/*- * Copyright (c) 2002 Marcel Moolenaar * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #include #ifdef __FBSDID __FBSDID("$FreeBSD: src/sbin/gpt/recover.c,v 1.8 2005/08/31 01:47:19 marcel Exp $"); #endif #ifdef __RCSID __RCSID("$NetBSD: recover.c,v 1.17 2017/03/22 19:59:16 martin Exp $"); #endif #include #include #include #include #include #include #include #include "map.h" #include "gpt.h" #include "gpt_private.h" static int cmd_recover(gpt_t, int, char *[]); static const char *recoverhelp[] = { "", }; struct gpt_cmd c_recover = { "recover", cmd_recover, recoverhelp, __arraycount(recoverhelp), 0, }; #define usage() gpt_usage(NULL, &c_recover) static int recover_gpt_hdr(gpt_t gpt, int type, off_t last) { const char *name, *origname; map_t *dgpt, dtbl, sgpt, stbl __unused; struct gpt_hdr *hdr; if (gpt_add_hdr(gpt, type, last) == -1) return -1; switch (type) { case MAP_TYPE_PRI_GPT_HDR: dgpt = &gpt->gpt; dtbl = gpt->tbl; sgpt = gpt->tpg; stbl = gpt->lbt; origname = "secondary"; name = "primary"; break; case MAP_TYPE_SEC_GPT_HDR: dgpt = &gpt->tpg; dtbl = gpt->lbt; sgpt = gpt->gpt; stbl = gpt->tbl; origname = "primary"; name = "secondary"; break; default: gpt_warn(gpt, "Bad table type %d", type); return -1; } memcpy((*dgpt)->map_data, sgpt->map_data, gpt->secsz); hdr = (*dgpt)->map_data; hdr->hdr_lba_self = htole64((uint64_t)(*dgpt)->map_start); hdr->hdr_lba_alt = htole64((uint64_t)sgpt->map_start); hdr->hdr_lba_table = htole64((uint64_t)dtbl->map_start); hdr->hdr_crc_self = 0; hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size))); if (gpt_write(gpt, *dgpt) == -1) { gpt_warnx(gpt, "Writing %s GPT header failed", name); return -1; } gpt_msg(gpt, "Recovered %s GPT header from %s", name, origname); return 0; } static int recover_gpt_tbl(gpt_t gpt, int type, off_t start) { const char *name, *origname; map_t *dtbl, stbl; switch (type) { case MAP_TYPE_PRI_GPT_TBL: dtbl = &gpt->tbl; stbl = gpt->lbt; origname = "secondary"; name = "primary"; break; case MAP_TYPE_SEC_GPT_TBL: dtbl = &gpt->lbt; stbl = gpt->tbl; origname = "primary"; name = "secondary"; break; default: gpt_warn(gpt, "Bad table type %d", type); return -1; } *dtbl = map_add(gpt, start, stbl->map_size, type, stbl->map_data, 0); if (*dtbl == NULL) { gpt_warnx(gpt, "Adding %s GPT table failed", name); return -1; } if (gpt_write(gpt, *dtbl) == -1) { gpt_warnx(gpt, "Writing %s GPT table failed", name); return -1; } gpt_msg(gpt, "Recovered %s GPT table from %s", name, origname); return 0; } static int recover(gpt_t gpt, int recoverable) { off_t last = gpt_last(gpt); map_t map; struct mbr *mbr; if (map_find(gpt, MAP_TYPE_MBR) != NULL) { gpt_warnx(gpt, "Device contains an MBR"); return -1; } gpt->gpt = map_find(gpt, MAP_TYPE_PRI_GPT_HDR); gpt->tpg = map_find(gpt, MAP_TYPE_SEC_GPT_HDR); gpt->tbl = map_find(gpt, MAP_TYPE_PRI_GPT_TBL); gpt->lbt = map_find(gpt, MAP_TYPE_SEC_GPT_TBL); if (gpt->gpt == NULL && gpt->tpg == NULL) { gpt_warnx(gpt, "No primary or secondary GPT headers, " "can't recover"); return -1; } if (gpt->tbl == NULL && gpt->lbt == NULL) { gpt_warnx(gpt, "No primary or secondary GPT tables, " "can't recover"); return -1; } if (gpt->gpt != NULL && le64toh(((struct gpt_hdr *)(gpt->gpt->map_data))->hdr_lba_alt) != (uint64_t)last) { gpt_warnx(gpt, "Media size has changed, please use " "'%s resizedisk'", getprogname()); return -1; } if (gpt->tbl != NULL && gpt->lbt == NULL) { if (recover_gpt_tbl(gpt, MAP_TYPE_SEC_GPT_TBL, last - gpt->tbl->map_size) == -1) return -1; } else if (gpt->tbl == NULL && gpt->lbt != NULL) { if (recover_gpt_tbl(gpt, MAP_TYPE_PRI_GPT_TBL, 2LL) == -1) return -1; } if (gpt->gpt != NULL && gpt->tpg == NULL) { if (recover_gpt_hdr(gpt, MAP_TYPE_SEC_GPT_HDR, last) == -1) return -1; } else if (gpt->gpt == NULL && gpt->tpg != NULL) { if (recover_gpt_hdr(gpt, MAP_TYPE_PRI_GPT_HDR, 1LL) == -1) return -1; } /* * Create PMBR if it doesn't already exist. */ if (map_find(gpt, MAP_TYPE_PMBR) == NULL) { if (map_free(gpt, 0LL, 1LL) == 0) { gpt_warnx(gpt, "No room for the PMBR"); return -1; } mbr = gpt_read(gpt, 0LL, 1); if (mbr == NULL) { gpt_warnx(gpt, "Error reading MBR"); return -1; } memset(mbr, 0, sizeof(*mbr)); mbr->mbr_sig = htole16(MBR_SIG); gpt_create_pmbr_part(mbr->mbr_part, last, 0); map = map_add(gpt, 0LL, 1LL, MAP_TYPE_PMBR, mbr, 1); if (gpt_write(gpt, map) == -1) { gpt_warn(gpt, "Can't write PMBR"); return -1; } gpt_msg(gpt, "Recreated PMBR (you may need to rerun 'gpt biosboot'"); } return 0; } static int cmd_recover(gpt_t gpt, int argc, char *argv[]) { int ch; int recoverable = 0; while ((ch = getopt(argc, argv, "r")) != -1) { switch(ch) { case 'r': recoverable = 1; break; default: return usage(); } } if (argc != optind) return usage(); return recover(gpt, recoverable); }