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 #include <stdio.h>
33 #include <stdint.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include "fstyp.h"
38
39 #define EXT2FS_SB_OFFSET 1024
40 #define EXT2_SUPER_MAGIC 0xef53
41 #define EXT2_DYNAMIC_REV 1
42
43 typedef struct e2sb {
44 uint8_t fake1[56];
45 uint16_t s_magic;
46 uint8_t fake2[18];
47 uint32_t s_rev_level;
48 uint8_t fake3[40];
49 char s_volume_name[16];
50 } e2sb_t;
51
52 int
fstyp_ext2fs(FILE * fp,char * label,size_t size)53 fstyp_ext2fs(FILE *fp, char *label, size_t size)
54 {
55 e2sb_t *fs;
56 char *s_volume_name;
57
58 fs = (e2sb_t *)read_buf(fp, EXT2FS_SB_OFFSET, 512);
59 if (fs == NULL)
60 return (1);
61
62 /* Check for magic and versio n*/
63 if (fs->s_magic == EXT2_SUPER_MAGIC &&
64 fs->s_rev_level == EXT2_DYNAMIC_REV) {
65 //G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
66 // pp->name);
67 } else {
68 free(fs);
69 return (1);
70 }
71
72 s_volume_name = fs->s_volume_name;
73 /* Terminate label */
74 s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
75
76 if (s_volume_name[0] == '/')
77 s_volume_name += 1;
78
79 strlcpy(label, s_volume_name, size);
80 free(fs);
81
82 return (0);
83 }
84