1 /* $NetBSD: testdb.c,v 1.8 2001/03/19 15:18:59 msaitoh 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "from: @(#)testdb.c 8.1 (Berkeley) 6/6/93"; 40 #else 41 __RCSID("$NetBSD: testdb.c,v 1.8 2001/03/19 15:18:59 msaitoh Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/file.h> 47 #include <sys/sysctl.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <limits.h> 51 #include <kvm.h> 52 #include <db.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <unistd.h> 56 #include <string.h> 57 #include <paths.h> 58 59 #include "extern.h" 60 61 /* Return true if the db file is valid, else false */ 62 int 63 testdb() 64 { 65 DB *db; 66 int kd, ret, dbversionlen; 67 DBT rec; 68 char dbversion[_POSIX2_LINE_MAX]; 69 char *kversion; 70 int mib[2]; 71 size_t size; 72 73 ret = 0; 74 db = NULL; 75 76 if ((kd = open(_PATH_KMEM, O_RDONLY, 0)) < 0) 77 goto close; 78 79 if ((db = dbopen(_PATH_KVMDB, O_RDONLY, 0, DB_HASH, NULL)) == NULL) 80 goto close; 81 82 /* Read the version out of the database */ 83 rec.data = VRS_KEY; 84 rec.size = sizeof(VRS_KEY) - 1; 85 if ((db->get)(db, &rec, &rec, 0)) 86 goto close; 87 if (rec.data == 0 || rec.size == 0 || rec.size > sizeof(dbversion)) 88 goto close; 89 memmove(dbversion, rec.data, rec.size); 90 dbversionlen = rec.size; 91 92 /* Read version string from kernel memory */ 93 mib[0] = CTL_KERN; 94 mib[1] = KERN_VERSION; 95 if (sysctl(mib, 2, NULL, &size, NULL, 0) == -1) 96 errx(1, "can't get size of kernel version string"); 97 98 if ((kversion = malloc(size)) == NULL) 99 err(1, "couldn't allocate space for buffer data"); 100 101 if (sysctl(mib, 2, kversion, &size, NULL, 0) == -1) 102 errx(1, "can't get kernel version string"); 103 104 /* If they match, we win */ 105 ret = memcmp(dbversion, kversion, dbversionlen) == 0; 106 107 close: if (kd >= 0) 108 (void)close(kd); 109 if (db) 110 (void)(db->close)(db); 111 return (ret); 112 } 113