getbootfile.c revision 1.1 
1/*	$NetBSD: getbootfile.c,v 1.1 2001/04/06 14:31:14 wiz 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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40#if defined(LIBC_SCCS) && !defined(lint)
41__RCSID("$NetBSD: getbootfile.c,v 1.1 2001/04/06 14:31:14 wiz Exp $");
42#endif
43
44#include <sys/param.h>
45#include <sys/sysctl.h>
46#include <machine/cpu.h>
47#include <paths.h>
48#include <util.h>
49
50#ifdef CPU_BOOTED_KERNEL
51static char name[MAXPATHLEN];
52#endif
53
54const char *
55getbootfile(void)
56{
57#ifdef CPU_BOOTED_KERNEL
58	int mib[2];
59	size_t size;
60#endif
61	const char *kernel;
62
63	kernel = _PATH_UNIX;
64#ifdef CPU_BOOTED_KERNEL
65	/* find real boot-kernel name */
66	mib[0] = CTL_MACHDEP;
67	mib[1] = CPU_BOOTED_KERNEL;
68	size = sizeof(name) - 1;
69	if (sysctl(mib, 2, name + 1, &size, NULL, NULL) == 0) {
70		/*
71		 * traditionally, this sysctl returns the relative
72		 * path of the kernel with the leading slash stripped
73		 * -- could be empty, though (e.g. when netbooting).
74		 */
75		if (name[1] != '\0') {
76			name[0] = '/';
77			kernel = name;
78		}
79
80		/* check if we got a valid and 'secure' filename */
81		if (secure_path(kernel) != 0) {
82			/* doesn't seems so, fall back to default */
83			kernel = _PATH_UNIX;
84		}
85	}
86#endif
87
88	return (kernel);
89}
90