1/* $NetBSD: testdb.c,v 1.9 2003/05/02 16:28:34 ragge Exp $ */ 2 3/*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#ifndef lint 34#if 0 35static char sccsid[] = "from: @(#)testdb.c 8.1 (Berkeley) 6/6/93"; 36#else 37__RCSID("$NetBSD: testdb.c,v 1.9 2003/05/02 16:28:34 ragge Exp $"); 38#endif 39#endif /* not lint */ 40 41#include <sys/param.h> 42#include <sys/file.h> 43#include <sys/sysctl.h> 44#include <err.h> 45#include <errno.h> 46#include <limits.h> 47#include <kvm.h> 48#include <db.h> 49#include <stdio.h> 50#include <stdlib.h> 51#include <unistd.h> 52#include <string.h> 53#include <paths.h> 54 55#include "extern.h" 56 57/* Return true if the db file is valid, else false */ 58int 59testdb() 60{ 61 DB *db; 62 int ret, dbversionlen; 63 DBT rec; 64 char dbversion[_POSIX2_LINE_MAX]; 65 char *kversion; 66 int mib[2]; 67 size_t size; 68 69 ret = 0; 70 db = NULL; 71 72 if ((db = dbopen(_PATH_KVMDB, O_RDONLY, 0, DB_HASH, NULL)) == NULL) 73 goto close; 74 75 /* Read the version out of the database */ 76 rec.data = VRS_KEY; 77 rec.size = sizeof(VRS_KEY) - 1; 78 if ((db->get)(db, &rec, &rec, 0)) 79 goto close; 80 if (rec.data == 0 || rec.size == 0 || rec.size > sizeof(dbversion)) 81 goto close; 82 memmove(dbversion, rec.data, rec.size); 83 dbversionlen = rec.size; 84 85 /* Read version string from kernel memory */ 86 mib[0] = CTL_KERN; 87 mib[1] = KERN_VERSION; 88 if (sysctl(mib, 2, NULL, &size, NULL, 0) == -1) 89 errx(1, "can't get size of kernel version string"); 90 91 if ((kversion = malloc(size)) == NULL) 92 err(1, "couldn't allocate space for buffer data"); 93 94 if (sysctl(mib, 2, kversion, &size, NULL, 0) == -1) 95 errx(1, "can't get kernel version string"); 96 97 /* If they match, we win */ 98 ret = memcmp(dbversion, kversion, dbversionlen) == 0; 99 100close: if (db) 101 (void)(db->close)(db); 102 return (ret); 103} 104