1 /* $NetBSD: disklabel.c,v 1.12 2021/05/26 04:28:15 mrg Exp $ */
2
3 /*-
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)disklabel.c 8.1 (Berkeley) 6/11/93
32 */
33
34 #include <sys/param.h>
35 #include <sys/disklabel.h>
36 #include <lib/libkern/libkern.h>
37 #include "stand.h"
38
39
40 #if defined(LIBSA_NO_DISKLABEL_MSGS)
41 #define nolabel (char *)1
42 #define corruptedlabel (char *)1
43 #else
44 static char nolabel[] = "no disk label";
45 static char corruptedlabel[] = "disk label corrupted";
46 #endif
47
48 char *
getdisklabel(const char * buf,struct disklabel * lp)49 getdisklabel(const char *buf, struct disklabel *lp)
50 {
51 const struct disklabel *dlp, *elp;
52 char *msg = NULL;
53
54 elp = (const void *)(buf + DEV_BSIZE - sizeof(*dlp));
55 for (dlp = (const void *)buf; dlp <= elp;
56 dlp = (const void *)((const char *)dlp + sizeof(long))) {
57 #if defined(LIBSA_DISKLABEL_EI)
58 if (dlp->d_magic == bswap32(DISKMAGIC) &&
59 dlp->d_magic2 == bswap32(DISKMAGIC)) {
60 disklabel_swap(__UNCONST(dlp), __UNCONST(dlp));
61 }
62 #endif
63 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
64 if (msg == NULL)
65 msg = nolabel;
66 } else if (dlp->d_npartitions > MAXPARTITIONS ||
67 dkcksum(dlp) != 0) {
68 msg = corruptedlabel;
69 } else {
70 (void)memcpy(lp, dlp, sizeof *lp);
71 msg = NULL;
72 break;
73 }
74 }
75 return msg;
76 }
77