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
51 typedef 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
60 int
fstyp_ext2fs(FILE * fp,char * label,size_t size)61 fstyp_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