81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
/* $NetBSD: magic.c,v 1.1 2000/02/05 20:40:45 jdc Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1999 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Julian Coleman, Waldi Ravens and Leo Weppelman.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "privahdi.h"
|
|
|
|
/*
|
|
* Check label magic numbers for AHDI partitions
|
|
*/
|
|
int
|
|
check_magic(fd, offset, flags)
|
|
int fd;
|
|
u_int offset;
|
|
int flags;
|
|
{
|
|
u_char *bblk;
|
|
u_int nsec;
|
|
int rv = 1;
|
|
|
|
nsec = (BBMINSIZE + (DEV_BSIZE - 1)) / DEV_BSIZE;
|
|
bblk = disk_read(fd, offset, nsec);
|
|
if (bblk != NULL) {
|
|
u_int *end, *p;
|
|
|
|
end = (u_int *)&bblk[BBMINSIZE - sizeof(struct disklabel)];
|
|
for (p = (u_int *)bblk; p < end; ++p) {
|
|
struct disklabel *dl = (struct disklabel *)&p[1];
|
|
if (((p[0] == NBDAMAGIC && offset == 0 &&
|
|
!(flags & FORCE_AHDI)) ||
|
|
(p[0] == AHDIMAGIC && offset != 0) ||
|
|
(u_char *)dl - bblk == 7168) &&
|
|
dl->d_npartitions <= MAXPARTITIONS &&
|
|
dl->d_magic2 == DISKMAGIC &&
|
|
dl->d_magic == DISKMAGIC &&
|
|
dkcksum(dl) == 0) {
|
|
rv = -3;
|
|
break;
|
|
}
|
|
}
|
|
free(bblk);
|
|
}
|
|
else
|
|
rv = -1;
|
|
|
|
return (rv);
|
|
}
|