1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005 Stanislav Sedov
5 * Copyright (c) 2014 The FreeBSD Foundation
6 * All rights reserved.
7 *
8 * This software was developed by Edward Tomasz Napierala under sponsorship
9 * from the FreeBSD Foundation.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
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
45 typedef 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
54 int
fstyp_ext2fs(FILE * fp,char * label,size_t size)55 fstyp_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