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/destroy.c,v 1.6 2005/08/31 01:47:19 marcel Exp $");
34#endif
35#ifdef __RCSID
36__RCSID("$NetBSD: destroy.c,v 1.14 2022/11/20 11:57:02 mlelstv 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
52static int cmd_destroy(gpt_t, int, char *[]);
53
54static const char *destroyhelp[] = {
55	"[-r]",
56};
57
58struct gpt_cmd c_destroy = {
59	"destroy",
60	cmd_destroy,
61	destroyhelp, __arraycount(destroyhelp),
62	GPT_OPTGPT | GPT_SYNC,
63};
64
65#define usage() gpt_usage(NULL, &c_destroy)
66
67
68static int
69destroy(gpt_t gpt, int force, int recoverable)
70{
71	map_t pri_hdr, sec_hdr, pmbr;
72
73	pri_hdr = map_find(gpt, MAP_TYPE_PRI_GPT_HDR);
74	sec_hdr = map_find(gpt, MAP_TYPE_SEC_GPT_HDR);
75	pmbr = map_find(gpt, MAP_TYPE_PMBR);
76
77	if (pri_hdr == NULL && sec_hdr == NULL) {
78		gpt_warnx(gpt, "Device doesn't contain a GPT");
79		return -1;
80	}
81
82	if (recoverable && sec_hdr == NULL) {
83		gpt_warnx(gpt, "Recoverability not possible");
84		return -1;
85	}
86
87	if (pri_hdr != NULL) {
88		memset(pri_hdr->map_data, 0, gpt->secsz);
89		if (gpt_write(gpt, pri_hdr) == -1) {
90			gpt_warnx(gpt, "Error writing primary header");
91			return -1;
92		}
93	}
94
95	if (!recoverable && sec_hdr != NULL) {
96		memset(sec_hdr->map_data, 0, gpt->secsz);
97		if (gpt_write(gpt, sec_hdr) == -1) {
98			gpt_warnx(gpt, "Error writing backup header");
99			return -1;
100		}
101	}
102
103	if (!recoverable && pmbr != NULL) {
104		memset(pmbr->map_data, 0, gpt->secsz);
105		if (gpt_write(gpt, pmbr) == -1) {
106			gpt_warnx(gpt, "Error deleting PMBR");
107			return -1;
108		}
109	}
110
111	return 0;
112}
113
114static int
115cmd_destroy(gpt_t gpt, int argc, char *argv[])
116{
117	int ch;
118	int recoverable = 0;
119
120	while ((ch = getopt(argc, argv, "fr")) != -1) {
121		switch(ch) {
122		case 'f':
123			break;
124		case 'r':
125			recoverable = 1;
126			break;
127		default:
128			return usage();
129		}
130	}
131
132	if (argc != optind)
133		return usage();
134
135	return destroy(gpt, 0, recoverable);
136}
137