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
52 static int cmd_destroy(gpt_t, int, char *[]);
53
54 static const char *destroyhelp[] = {
55 "[-r]",
56 };
57
58 struct 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
68 static int
destroy(gpt_t gpt,int force,int recoverable)69 destroy(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
114 static int
cmd_destroy(gpt_t gpt,int argc,char * argv[])115 cmd_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