1/*-
2 * Copyright (c) 2004 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__FBSDID("$FreeBSD: src/sbin/gpt/remove.c,v 1.10.10.1 2010/02/10 00:26:20 kensmith Exp $");
29
30#include <sys/types.h>
31
32#include <err.h>
33#include <stddef.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <unistd.h>
38
39#include "map.h"
40#include "gpt.h"
41
42static int all;
43static uuid_t type;
44static off_t block, size;
45static unsigned int entry;
46
47static void
48usage_remove(void)
49{
50
51	fprintf(stderr,
52	    "usage: %s -a device ...\n"
53	    "       %s [-b lba] [-i index] [-s lba] [-t uuid] device ...\n",
54	    getprogname(), getprogname());
55	exit(1);
56}
57
58static void
59rem(int fd)
60{
61	uuid_t uuid;
62	map_t *gpt, *tpg;
63	map_t *tbl, *lbt;
64	map_t *m;
65	struct gpt_hdr *hdr;
66	struct gpt_ent *ent;
67	unsigned int i;
68
69	gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
70	if (gpt == NULL) {
71		warnx("%s: error: no primary GPT header; run create or recover",
72		    device_name);
73		return;
74	}
75
76	tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
77	if (tpg == NULL) {
78		warnx("%s: error: no secondary GPT header; run recover",
79		    device_name);
80		return;
81	}
82
83	tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
84	lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
85	if (tbl == NULL || lbt == NULL) {
86		warnx("%s: error: run recover -- trust me", device_name);
87		return;
88	}
89
90	/* Remove all matching entries in the map. */
91	for (m = map_first(); m != NULL; m = m->map_next) {
92		if (m->map_type != MAP_TYPE_GPT_PART || m->map_index < 1)
93			continue;
94		if (entry > 0 && entry != m->map_index)
95			continue;
96		if (block > 0 && block != m->map_start)
97			continue;
98		if (size > 0 && size != m->map_size)
99			continue;
100
101		i = m->map_index - 1;
102
103		hdr = gpt->map_data;
104		ent = (void*)((char*)tbl->map_data + i *
105		    le32toh(hdr->hdr_entsz));
106		le_uuid_dec(&ent->ent_type, &uuid);
107		if (!uuid_is_nil(&type, NULL) &&
108		    !uuid_equal(&type, &uuid, NULL))
109			continue;
110
111		/* Remove the primary entry by clearing the partition type. */
112		uuid_create_nil(&ent->ent_type, NULL);
113
114		hdr->hdr_crc_table = htole32(crc32(tbl->map_data,
115		    le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
116		hdr->hdr_crc_self = 0;
117		hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
118
119		gpt_write(fd, gpt);
120		gpt_write(fd, tbl);
121
122		hdr = tpg->map_data;
123		ent = (void*)((char*)lbt->map_data + i *
124		    le32toh(hdr->hdr_entsz));
125
126		/* Remove the secundary entry. */
127		uuid_create_nil(&ent->ent_type, NULL);
128
129		hdr->hdr_crc_table = htole32(crc32(lbt->map_data,
130		    le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
131		hdr->hdr_crc_self = 0;
132		hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
133
134		gpt_write(fd, lbt);
135		gpt_write(fd, tpg);
136
137#ifdef __APPLE__
138		printf("%ss%u removed\n", device_name, m->map_index);
139#else
140		printf("%sp%u removed\n", device_name, m->map_index);
141#endif
142	}
143}
144
145int
146cmd_remove(int argc, char *argv[])
147{
148	char *p;
149	int ch, fd;
150
151	/* Get the remove options */
152	while ((ch = getopt(argc, argv, "ab:i:s:t:")) != -1) {
153		switch(ch) {
154		case 'a':
155			if (all > 0)
156				usage_remove();
157			all = 1;
158			break;
159		case 'b':
160			if (block > 0)
161				usage_remove();
162			block = strtoll(optarg, &p, 10);
163			if (*p != 0 || block < 1)
164				usage_remove();
165			break;
166		case 'i':
167			if (entry > 0)
168				usage_remove();
169			entry = strtol(optarg, &p, 10);
170			if (*p != 0 || entry < 1)
171				usage_remove();
172			break;
173		case 's':
174			if (size > 0)
175				usage_remove();
176			size = strtoll(optarg, &p, 10);
177			if (*p != 0 || size < 1)
178				usage_remove();
179			break;
180		case 't':
181			if (!uuid_is_nil(&type, NULL))
182				usage_remove();
183			if (parse_uuid(optarg, &type) != 0)
184				usage_remove();
185			break;
186		default:
187			usage_remove();
188		}
189	}
190
191	if (!all ^
192	    (block > 0 || entry > 0 || size > 0 || !uuid_is_nil(&type, NULL)))
193		usage_remove();
194
195	if (argc == optind)
196		usage_remove();
197
198	while (optind < argc) {
199		fd = gpt_open(argv[optind++]);
200		if (fd == -1) {
201			warn("unable to open device '%s'", device_name);
202			return (1);
203		}
204
205		rem(fd);
206
207		gpt_close(fd);
208	}
209
210	return (0);
211}
212