1/*-
2 * Copyright (c) 2005 Stanislav Sedov
3 * Copyright (c) 2014 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: releng/10.3/usr.sbin/fstyp/ext2fs.c 277437 2015-01-20 20:44:16Z trasz $");
33
34#include <stdio.h>
35#include <stdint.h>
36#include <stdlib.h>
37#include <string.h>
38
39#include "fstyp.h"
40
41#define EXT2FS_SB_OFFSET	1024
42#define EXT2_SUPER_MAGIC	0xef53
43#define EXT2_DYNAMIC_REV	1
44
45typedef struct e2sb {
46	uint8_t		fake1[56];
47	uint16_t	s_magic;
48	uint8_t		fake2[18];
49	uint32_t	s_rev_level;
50	uint8_t		fake3[40];
51	char		s_volume_name[16];
52} e2sb_t;
53
54int
55fstyp_ext2fs(FILE *fp, char *label, size_t size)
56{
57	e2sb_t *fs;
58	char *s_volume_name;
59
60	fs = (e2sb_t *)read_buf(fp, EXT2FS_SB_OFFSET, 512);
61	if (fs == NULL)
62		return (1);
63
64	/* Check for magic and versio n*/
65	if (fs->s_magic == EXT2_SUPER_MAGIC &&
66	    fs->s_rev_level == EXT2_DYNAMIC_REV) {
67		//G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
68		//    pp->name);
69	} else {
70		free(fs);
71		return (1);
72	}
73
74	s_volume_name = fs->s_volume_name;
75	/* Terminate label */
76	s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
77
78	if (s_volume_name[0] == '/')
79		s_volume_name += 1;
80
81	strlcpy(label, s_volume_name, size);
82	free(fs);
83
84	return (0);
85}
86