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