1/*	$NetBSD: ext2fs.c,v 1.1 2018/01/09 03:31:15 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2017 The NetBSD Foundation, Inc.
5 * Copyright (c) 2016 The DragonFly Project
6 * Copyright (c) 2005 Stanislav Sedov
7 * Copyright (c) 2014 The FreeBSD Foundation
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to The NetBSD Foundation
11 * by Tomohiro Kusumi <kusumi.tomohiro@gmail.com>.
12 *
13 * This software was developed by Edward Tomasz Napierala under sponsorship
14 * from the FreeBSD Foundation.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37#include <sys/cdefs.h>
38__RCSID("$NetBSD: ext2fs.c,v 1.1 2018/01/09 03:31:15 christos Exp $");
39
40#include <stdio.h>
41#include <stdint.h>
42#include <stdlib.h>
43#include <string.h>
44
45#include "fstyp.h"
46
47#define EXT2FS_SB_OFFSET	1024
48#define EXT2_SUPER_MAGIC	0xef53
49#define EXT2_DYNAMIC_REV	1
50
51typedef struct e2sb {
52	uint8_t		fake1[56];
53	uint16_t	s_magic;
54	uint8_t		fake2[18];
55	uint32_t	s_rev_level;
56	uint8_t		fake3[40];
57	char		s_volume_name[16];
58} e2sb_t;
59
60int
61fstyp_ext2fs(FILE *fp, char *label, size_t size)
62{
63	e2sb_t *fs;
64	char *s_volume_name;
65
66	fs = read_buf(fp, EXT2FS_SB_OFFSET, 512);
67	if (fs == NULL)
68		return 1;
69
70	/* Check for magic and versio n*/
71	if (fs->s_magic == EXT2_SUPER_MAGIC &&
72	    fs->s_rev_level == EXT2_DYNAMIC_REV) {
73		//G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
74		//    pp->name);
75	} else {
76		free(fs);
77		return 1;
78	}
79
80	s_volume_name = fs->s_volume_name;
81	/* Terminate label */
82	s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
83
84	if (s_volume_name[0] == '/')
85		s_volume_name += 1;
86
87	strlcpy(label, s_volume_name, size);
88	free(fs);
89
90	return 0;
91}
92