xref: /freebsd/usr.sbin/fstyp/geli.c (revision c1eb4109f3b1d90a9c1538179ea6a52a191899b2)
1 /*-
2  * Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/disk.h>
31 #include <sys/types.h>
32 #include <stdint.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37 
38 #include <geom/eli/g_eli.h>
39 
40 #include "fstyp.h"
41 
42 int
43 fstyp_geli(FILE *fp, char *label __unused, size_t labelsize __unused)
44 {
45 	int error;
46 	off_t mediasize;
47 	u_int sectorsize;
48 	struct g_eli_metadata md;
49 	u_char *buf;
50 
51 	error = ioctl(fileno(fp), DIOCGMEDIASIZE, &mediasize);
52 	if (error != 0)
53 		return (1);
54 	error = ioctl(fileno(fp), DIOCGSECTORSIZE, &sectorsize);
55 	if (error != 0)
56 		return (1);
57 	buf = (u_char *)read_buf(fp, mediasize - sectorsize, sectorsize);
58 	if (buf == NULL)
59 		goto gelierr;
60 	error = eli_metadata_decode(buf, &md);
61 	if (error)
62 		goto gelierr;
63 
64 	if (strcmp(md.md_magic, G_ELI_MAGIC) == 0) {
65 		free(buf);
66 		return (0);
67 	}
68 
69 gelierr:
70 	free(buf);
71 
72 	return (1);
73 }
74