1/*	$NetBSD: getbootfile.c,v 1.4 2003/10/21 00:47:46 fvdl Exp $	*/
2
3/*-
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Thomas Klausner.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34__RCSID("$NetBSD: getbootfile.c,v 1.4 2003/10/21 00:47:46 fvdl Exp $");
35#endif
36
37#include <sys/param.h>
38#include <sys/sysctl.h>
39#include <machine/cpu.h>
40#include <string.h>
41#include <paths.h>
42#include <util.h>
43
44#ifdef CPU_BOOTED_KERNEL
45static char name[MAXPATHLEN];
46#endif
47
48const char *
49getbootfile(void)
50{
51#ifdef CPU_BOOTED_KERNEL
52	int mib[2];
53	size_t size;
54#endif
55	const char *kernel;
56
57	kernel = _PATH_UNIX;
58#ifdef CPU_BOOTED_KERNEL
59	/* find real boot-kernel name */
60	mib[0] = CTL_MACHDEP;
61	mib[1] = CPU_BOOTED_KERNEL;
62	size = sizeof(name) - 1;
63	if (sysctl(mib, 2, name + 1, &size, NULL, 0) == 0) {
64		/*
65		 * traditionally, this sysctl returns the relative
66		 * path of the kernel with the leading slash stripped
67		 * -- could be empty, though (e.g. when netbooting).
68		 */
69		if (name[1] != '\0') {
70			name[0] = '/';
71			kernel = name;
72		}
73
74		/* check if we got a valid and 'secure' filename */
75		if (strcmp(kernel, _PATH_UNIX) != 0 &&
76		    secure_path(kernel) != 0) {
77			/* doesn't seems so, fall back to default */
78			kernel = _PATH_UNIX;
79		}
80	}
81#endif
82
83	return (kernel);
84}
85