1/* $NetBSD: magic.c,v 1.2 2008/04/28 20:23:15 martin Exp $ */ 2 3/* 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julian Coleman, Waldi Ravens and Leo Weppelman. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "privahdi.h" 33#include <stdlib.h> 34 35/* 36 * Check label magic numbers for AHDI partitions 37 */ 38int 39check_magic(int fd, u_int offset, int flags) 40{ 41 u_char *bblk; 42 u_int nsec; 43 int rv = 1; 44 45 nsec = (BBMINSIZE + (DEV_BSIZE - 1)) / DEV_BSIZE; 46 bblk = disk_read(fd, offset, nsec); 47 if (bblk != NULL) { 48 u_int *end, *p; 49 50 end = (u_int *)&bblk[BBMINSIZE - sizeof(struct disklabel)]; 51 for (p = (u_int *)bblk; p < end; ++p) { 52 struct disklabel *dl = (struct disklabel *)&p[1]; 53 if (((p[0] == NBDAMAGIC && offset == 0 && 54 !(flags & FORCE_AHDI)) || 55 (p[0] == AHDIMAGIC && offset != 0) || 56 (u_char *)dl - bblk == 7168) && 57 dl->d_npartitions <= MAXPARTITIONS && 58 dl->d_magic2 == DISKMAGIC && 59 dl->d_magic == DISKMAGIC && 60 dkcksum(dl) == 0) { 61 rv = -3; 62 break; 63 } 64 } 65 free(bblk); 66 } 67 else 68 rv = -1; 69 70 return (rv); 71} 72