1 /* $NetBSD: magic.c,v 1.1.1.1 2000/08/07 09:23:40 leo 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include "privahdi.h" 40 #include <stdlib.h> 41 42 /* 43 * Check label magic numbers for AHDI partitions 44 */ 45 int 46 check_magic(fd, offset, flags) 47 int fd; 48 u_int offset; 49 int flags; 50 { 51 u_char *bblk; 52 u_int nsec; 53 int rv = 1; 54 55 nsec = (BBMINSIZE + (DEV_BSIZE - 1)) / DEV_BSIZE; 56 bblk = disk_read(fd, offset, nsec); 57 if (bblk != NULL) { 58 u_int *end, *p; 59 60 end = (u_int *)&bblk[BBMINSIZE - sizeof(struct disklabel)]; 61 for (p = (u_int *)bblk; p < end; ++p) { 62 struct disklabel *dl = (struct disklabel *)&p[1]; 63 if (((p[0] == NBDAMAGIC && offset == 0 && 64 !(flags & FORCE_AHDI)) || 65 (p[0] == AHDIMAGIC && offset != 0) || 66 (u_char *)dl - bblk == 7168) && 67 dl->d_npartitions <= MAXPARTITIONS && 68 dl->d_magic2 == DISKMAGIC && 69 dl->d_magic == DISKMAGIC && 70 dkcksum(dl) == 0) { 71 rv = -3; 72 break; 73 } 74 } 75 free(bblk); 76 } 77 else 78 rv = -1; 79 80 return (rv); 81 } 82