1 /* $NetBSD: getbootfile.c,v 1.5 2008/04/28 20:23:02 martin 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 1.5 2008/04/28 20:23:02 martin 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 45 static char name[MAXPATHLEN]; 46 #endif 47 48 const char * 49 getbootfile(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