scheme.c revision 287122 
1/*-
2 * Copyright (c) 2013,2014 Juniper Networks, Inc.
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 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/usr.bin/mkimg/scheme.c 287122 2015-08-25 04:03:51Z marcel $");
29
30#include <sys/types.h>
31#include <sys/linker_set.h>
32#include <sys/queue.h>
33#include <sys/stat.h>
34#include <assert.h>
35#include <err.h>
36#include <errno.h>
37#include <limits.h>
38#include <stdint.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42
43#include "image.h"
44#include "mkimg.h"
45#include "scheme.h"
46
47static struct {
48	const char *name;
49	enum alias alias;
50} scheme_alias[] = {
51	{ "ebr", ALIAS_EBR },
52	{ "efi", ALIAS_EFI },
53	{ "fat32", ALIAS_FAT32 },
54	{ "freebsd", ALIAS_FREEBSD },
55	{ "freebsd-boot", ALIAS_FREEBSD_BOOT },
56	{ "freebsd-nandfs", ALIAS_FREEBSD_NANDFS },
57	{ "freebsd-swap", ALIAS_FREEBSD_SWAP },
58	{ "freebsd-ufs", ALIAS_FREEBSD_UFS },
59	{ "freebsd-vinum", ALIAS_FREEBSD_VINUM },
60	{ "freebsd-zfs", ALIAS_FREEBSD_ZFS },
61	{ "mbr", ALIAS_MBR },
62	{ "ntfs", ALIAS_NTFS },
63	{ NULL, ALIAS_NONE }		/* Keep last! */
64};
65
66static struct mkimg_scheme *scheme;
67static void *bootcode;
68
69static enum alias
70scheme_parse_alias(const char *name)
71{
72	u_int idx;
73
74	idx = 0;
75	while (scheme_alias[idx].name != NULL) {
76		if (strcasecmp(scheme_alias[idx].name, name) == 0)
77			return (scheme_alias[idx].alias);
78		idx++;
79	}
80	return (ALIAS_NONE);
81}
82
83int
84scheme_select(const char *spec)
85{
86	struct mkimg_scheme *s, **iter;
87
88	SET_FOREACH(iter, schemes) {
89		s = *iter;
90		if (strcasecmp(spec, s->name) == 0) {
91			scheme = s;
92			return (0);
93		}
94	}
95	return (EINVAL);
96}
97
98struct mkimg_scheme *
99scheme_selected(void)
100{
101
102	return (scheme);
103}
104
105int
106scheme_bootcode(int fd)
107{
108	struct stat sb;
109
110	if (scheme == NULL || scheme->bootcode == 0)
111		return (ENXIO);
112
113	if (fstat(fd, &sb) == -1)
114		return (errno);
115	if (sb.st_size > scheme->bootcode)
116		return (EFBIG);
117
118	bootcode = malloc(scheme->bootcode);
119	if (bootcode == NULL)
120		return (ENOMEM);
121	memset(bootcode, 0, scheme->bootcode);
122	if (read(fd, bootcode, sb.st_size) != sb.st_size) {
123		free(bootcode);
124		bootcode = NULL;
125		return (errno);
126	}
127	return (0);
128}
129
130int
131scheme_check_part(struct part *p)
132{
133	struct mkimg_alias *iter;
134	enum alias alias;
135
136	assert(scheme != NULL);
137
138	/* Check the partition type alias */
139	alias = scheme_parse_alias(p->alias);
140	if (alias == ALIAS_NONE)
141		return (EINVAL);
142
143	iter = scheme->aliases;
144	while (iter->alias != ALIAS_NONE) {
145		if (alias == iter->alias)
146			break;
147		iter++;
148	}
149	if (iter->alias == ALIAS_NONE)
150		return (EINVAL);
151	p->type = iter->type;
152
153	/* Validate the optional label. */
154	if (p->label != NULL) {
155		if (strlen(p->label) > scheme->labellen)
156			return (EINVAL);
157	}
158
159	return (0);
160}
161
162u_int
163scheme_max_parts(void)
164{
165
166	return ((scheme == NULL) ? 0 : scheme->nparts);
167}
168
169u_int
170scheme_max_secsz(void)
171{
172
173	return ((scheme == NULL) ? INT_MAX+1U : scheme->maxsecsz);
174}
175
176lba_t
177scheme_metadata(u_int where, lba_t start)
178{
179
180	return ((scheme == NULL) ? start : scheme->metadata(where, start));
181}
182
183int
184scheme_write(lba_t end)
185{
186
187	return ((scheme == NULL) ? 0 : scheme->write(end, bootcode));
188}
189