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("$FreeBSD$");
29
30#include <sys/stat.h>
31#include <assert.h>
32#include <errno.h>
33#include <limits.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37
38#include "image.h"
39#include "mkimg.h"
40#include "scheme.h"
41
42static struct {
43	const char *name;
44	enum alias alias;
45} scheme_alias[] = {
46	{ "ebr", ALIAS_EBR },
47	{ "efi", ALIAS_EFI },
48	{ "fat16b", ALIAS_FAT16B },
49	{ "fat32", ALIAS_FAT32 },
50	{ "freebsd", ALIAS_FREEBSD },
51	{ "freebsd-boot", ALIAS_FREEBSD_BOOT },
52	{ "freebsd-nandfs", ALIAS_FREEBSD_NANDFS },
53	{ "freebsd-swap", ALIAS_FREEBSD_SWAP },
54	{ "freebsd-ufs", ALIAS_FREEBSD_UFS },
55	{ "freebsd-vinum", ALIAS_FREEBSD_VINUM },
56	{ "freebsd-zfs", ALIAS_FREEBSD_ZFS },
57	{ "mbr", ALIAS_MBR },
58	{ "ntfs", ALIAS_NTFS },
59	{ "prepboot", ALIAS_PPCBOOT },
60	{ NULL, ALIAS_NONE }		/* Keep last! */
61};
62
63static struct mkimg_scheme *first;
64static struct mkimg_scheme *scheme;
65static void *bootcode;
66
67static enum alias
68scheme_parse_alias(const char *name)
69{
70	u_int idx;
71
72	idx = 0;
73	while (scheme_alias[idx].name != NULL) {
74		if (strcasecmp(scheme_alias[idx].name, name) == 0)
75			return (scheme_alias[idx].alias);
76		idx++;
77	}
78	return (ALIAS_NONE);
79}
80
81struct mkimg_scheme *
82scheme_iterate(struct mkimg_scheme *s)
83{
84
85	return ((s == NULL) ? first : s->next);
86}
87
88void
89scheme_register(struct mkimg_scheme *s)
90{
91	s->next = first;
92	first = s;
93}
94
95int
96scheme_select(const char *spec)
97{
98	struct mkimg_scheme *s;
99
100	s = NULL;
101	while ((s = scheme_iterate(s)) != NULL) {
102		if (strcasecmp(spec, s->name) == 0) {
103			scheme = s;
104			return (0);
105		}
106	}
107	return (EINVAL);
108}
109
110struct mkimg_scheme *
111scheme_selected(void)
112{
113
114	return (scheme);
115}
116
117int
118scheme_bootcode(int fd)
119{
120	struct stat sb;
121
122	if (scheme == NULL || scheme->bootcode == 0)
123		return (ENXIO);
124
125	if (fstat(fd, &sb) == -1)
126		return (errno);
127	if (sb.st_size > scheme->bootcode)
128		return (EFBIG);
129
130	bootcode = malloc(scheme->bootcode);
131	if (bootcode == NULL)
132		return (ENOMEM);
133	memset(bootcode, 0, scheme->bootcode);
134	if (read(fd, bootcode, sb.st_size) != sb.st_size) {
135		free(bootcode);
136		bootcode = NULL;
137		return (errno);
138	}
139	return (0);
140}
141
142int
143scheme_check_part(struct part *p)
144{
145	struct mkimg_alias *iter;
146	enum alias alias;
147
148	assert(scheme != NULL);
149
150	/* Check the partition type alias */
151	alias = scheme_parse_alias(p->alias);
152	if (alias == ALIAS_NONE)
153		return (EINVAL);
154
155	iter = scheme->aliases;
156	while (iter->alias != ALIAS_NONE) {
157		if (alias == iter->alias)
158			break;
159		iter++;
160	}
161	if (iter->alias == ALIAS_NONE)
162		return (EINVAL);
163	p->type = iter->type;
164
165	/* Validate the optional label. */
166	if (p->label != NULL) {
167		if (strlen(p->label) > scheme->labellen)
168			return (EINVAL);
169	}
170
171	return (0);
172}
173
174u_int
175scheme_max_parts(void)
176{
177
178	return ((scheme == NULL) ? 0 : scheme->nparts);
179}
180
181u_int
182scheme_max_secsz(void)
183{
184
185	return ((scheme == NULL) ? INT_MAX+1U : scheme->maxsecsz);
186}
187
188lba_t
189scheme_metadata(u_int where, lba_t start)
190{
191
192	return ((scheme == NULL) ? start : scheme->metadata(where, start));
193}
194
195int
196scheme_write(lba_t end)
197{
198
199	return ((scheme == NULL) ? 0 : scheme->write(end, bootcode));
200}
201