/* $NetBSD: getbootfile.c,v 1.6 2016/01/25 18:14:04 christos Exp $ */ /*- * Copyright (c) 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Thomas Klausner. * * 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 <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: getbootfile.c,v 1.6 2016/01/25 18:14:04 christos Exp $"); #endif #include <sys/param.h> #include <sys/sysctl.h> #include <sys/cpu.h> #include <string.h> #include <paths.h> #include <util.h> #ifdef CPU_BOOTED_KERNEL static char name[MAXPATHLEN]; #endif const char * getbootfile(void) { #ifdef CPU_BOOTED_KERNEL int mib[2]; size_t size; #endif const char *kernel; kernel = _PATH_UNIX; #ifdef CPU_BOOTED_KERNEL /* find real boot-kernel name */ mib[0] = CTL_MACHDEP; mib[1] = CPU_BOOTED_KERNEL; size = sizeof(name) - 1; if (sysctl(mib, 2, name + 1, &size, NULL, 0) == 0) { /* * traditionally, this sysctl returns the relative * path of the kernel with the leading slash stripped * -- could be empty, though (e.g. when netbooting). */ if (name[1] != '\0') { name[0] = '/'; kernel = name; } /* check if we got a valid and 'secure' filename */ if (strcmp(kernel, _PATH_UNIX) != 0 && secure_path(kernel) != 0) { /* doesn't seems so, fall back to default */ kernel = _PATH_UNIX; } } #endif return (kernel); } |