/* $NetBSD: magic.c,v 1.3 2009/03/14 15:36:03 dsl 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. * * 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" #include /* * Check label magic numbers for AHDI partitions */ int check_magic(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); }