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 1.3 2007/12/18 21:46:47 riz 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
47static int recoverable;
48
49const char recovermsg[] = "recover device ...";
50
51__dead static void
52usage_recover(void)
53{
54
55	fprintf(stderr,
56	    "usage: %s %s\n", getprogname(), recovermsg);
57	exit(1);
58}
59
60static void
61recover(int fd)
62{
63	off_t last;
64	map_t *gpt, *tpg;
65	map_t *tbl, *lbt;
66	struct gpt_hdr *hdr;
67
68	if (map_find(MAP_TYPE_MBR) != NULL) {
69		warnx("%s: error: device contains a MBR", device_name);
70		return;
71	}
72
73	gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
74	tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
75	tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
76	lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
77
78	if (gpt == NULL && tpg == NULL) {
79		warnx("%s: no primary or secondary GPT headers, can't recover",
80		    device_name);
81		return;
82	}
83	if (tbl == NULL && lbt == NULL) {
84		warnx("%s: no primary or secondary GPT tables, can't recover",
85		    device_name);
86		return;
87	}
88
89	last = mediasz / secsz - 1LL;
90
91	if (tbl != NULL && lbt == NULL) {
92		lbt = map_add(last - tbl->map_size, tbl->map_size,
93		    MAP_TYPE_SEC_GPT_TBL, tbl->map_data);
94		if (lbt == NULL) {
95			warnx("%s: adding secondary GPT table failed",
96			    device_name);
97			return;
98		}
99		gpt_write(fd, lbt);
100		warnx("%s: recovered secondary GPT table from primary",
101		    device_name);
102	} else if (tbl == NULL && lbt != NULL) {
103		tbl = map_add(2LL, lbt->map_size, MAP_TYPE_PRI_GPT_TBL,
104		    lbt->map_data);
105		if (tbl == NULL) {
106			warnx("%s: adding primary GPT table failed",
107			    device_name);
108			return;
109		}
110		gpt_write(fd, tbl);
111		warnx("%s: recovered primary GPT table from secondary",
112		    device_name);
113	}
114
115	if (gpt != NULL && tpg == NULL) {
116		tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR,
117		    calloc(1, secsz));
118		if (tpg == NULL) {
119			warnx("%s: adding secondary GPT header failed",
120			    device_name);
121			return;
122		}
123		memcpy(tpg->map_data, gpt->map_data, secsz);
124		hdr = tpg->map_data;
125		hdr->hdr_lba_self = htole64(tpg->map_start);
126		hdr->hdr_lba_alt = htole64(gpt->map_start);
127		hdr->hdr_lba_table = htole64(lbt->map_start);
128		hdr->hdr_crc_self = 0;
129		hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
130		gpt_write(fd, tpg);
131		warnx("%s: recovered secondary GPT header from primary",
132		    device_name);
133	} else if (gpt == NULL && tpg != NULL) {
134		gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR,
135		    calloc(1, secsz));
136		if (gpt == NULL) {
137			warnx("%s: adding primary GPT header failed",
138			    device_name);
139			return;
140		}
141		memcpy(gpt->map_data, tpg->map_data, secsz);
142		hdr = gpt->map_data;
143		hdr->hdr_lba_self = htole64(gpt->map_start);
144		hdr->hdr_lba_alt = htole64(tpg->map_start);
145		hdr->hdr_lba_table = htole64(tbl->map_start);
146		hdr->hdr_crc_self = 0;
147		hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
148		gpt_write(fd, gpt);
149		warnx("%s: recovered primary GPT header from secondary",
150		    device_name);
151	}
152}
153
154int
155cmd_recover(int argc, char *argv[])
156{
157	int ch, fd;
158
159	while ((ch = getopt(argc, argv, "r")) != -1) {
160		switch(ch) {
161		case 'r':
162			recoverable = 1;
163			break;
164		default:
165			usage_recover();
166		}
167	}
168
169	if (argc == optind)
170		usage_recover();
171
172	while (optind < argc) {
173		fd = gpt_open(argv[optind++]);
174		if (fd == -1) {
175			warn("unable to open device '%s'", device_name);
176			continue;
177		}
178
179		recover(fd);
180
181		gpt_close(fd);
182	}
183
184	return (0);
185}
186