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/* $OpenBSD: testdb.c,v 1.10 2019/06/28 13:32:48 deraadt Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/sysctl.h>
#include <db.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
/* Return true if the db file is valid, else false */
int
testdb(char *dbname)
{
DBT rec;
DB *db = NULL;
size_t kversionlen;
char kversion[LINE_MAX];
int mib[2], ret = 0;
/* Read version string of running kernel */
mib[0] = CTL_KERN;
mib[1] = KERN_VERSION;
kversionlen = sizeof(kversion);
if (sysctl(mib, 2, kversion, &kversionlen, NULL, 0) == -1)
goto close;
/* Read the version out of the database */
if ((db = dbopen(dbname, O_RDONLY, 0, DB_HASH, NULL)) == NULL)
goto close;
rec.data = VRS_KEY;
rec.size = sizeof(VRS_KEY) - 1;
if ((db->get)(db, &rec, &rec, 0))
goto close;
if (rec.data == NULL || rec.size > kversionlen)
goto close;
/* If they match, we win */
ret = memcmp(kversion, rec.data, rec.size) == 0;
close:
if (db)
(void)(db->close)(db);
return (ret);
}
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