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