/* $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);
}
