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