1 /* $NetBSD: testdb.c,v 1.10 2003/08/07 11:25:23 agc 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
35 static char sccsid[] = "from: @(#)testdb.c 8.1 (Berkeley) 6/6/93";
36 #else
37 __RCSID("$NetBSD: testdb.c,v 1.10 2003/08/07 11:25:23 agc 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 */
58 int
testdb()59 testdb()
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
100 close: if (db)
101 (void)(db->close)(db);
102 return (ret);
103 }
104