1 /* $NetBSD: getbootfile.c,v 1.2 2002/09/12 14:42:15 christos 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 1.2 2002/09/12 14:42:15 christos 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 51 static char name[MAXPATHLEN]; 52 #endif 53 54 const char * 55 getbootfile(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 (strcmp(kernel, _PATH_UNIX) != 0 && 82 secure_path(kernel) != 0) { 83 /* doesn't seems so, fall back to default */ 84 kernel = _PATH_UNIX; 85 } 86 } 87 #endif 88 89 return (kernel); 90 } 91