/* $OpenBSD: testdb.c,v 1.3 1998/08/19 06:47:55 millert 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. */ #ifndef lint #if 0 static char sccsid[] = "from: @(#)testdb.c 8.1 (Berkeley) 6/6/93"; #else static char *rcsid = "$OpenBSD: testdb.c,v 1.3 1998/08/19 06:47:55 millert Exp $"; #endif #endif /* not lint */ #include <sys/param.h> #include <sys/file.h> #include <errno.h> #include <limits.h> #include <kvm.h> #include <db.h> #include <stdio.h> #include <unistd.h> #include <string.h> #include <paths.h> #include "extern.h" /* Return true if the db file is valid, else false */ int testdb(dbname) char *dbname; { register DB *db; register int cc, kd, ret, dbversionlen; DBT rec; struct nlist nitem; char dbversion[_POSIX2_LINE_MAX]; char kversion[_POSIX2_LINE_MAX]; ret = 0; db = NULL; if ((kd = open(_PATH_KMEM, O_RDONLY, 0)) < 0) goto close; if ((db = dbopen(dbname, O_RDONLY, 0, DB_HASH, NULL)) == NULL) goto close; /* Read the version out of the database */ rec.data = VRS_KEY; rec.size = sizeof(VRS_KEY) - 1; if ((db->get)(db, &rec, &rec, 0)) goto close; if (rec.data == 0 || rec.size == 0 || rec.size > sizeof(dbversion)) goto close; (void)memcpy(dbversion, rec.data, rec.size); dbversionlen = rec.size; /* Read version string from kernel memory */ rec.data = VRS_SYM; rec.size = sizeof(VRS_SYM) - 1; if ((db->get)(db, &rec, &rec, 0)) goto close; if (rec.data == 0 || rec.size != sizeof(struct nlist)) goto close; (void)memcpy(&nitem, rec.data, sizeof(nitem)); /* * Theoretically possible for lseek to be seeking to -1. Not * that it's something to lie awake nights about, however. */ errno = 0; if (lseek(kd, (off_t)nitem.n_value, SEEK_SET) == -1 && errno != 0) goto close; cc = read(kd, kversion, sizeof(kversion)); if (cc < 0 || cc != sizeof(kversion)) goto close; /* If they match, we win */ ret = memcmp(kversion, dbversion, dbversionlen) == 0; close: if (kd >= 0) (void)close(kd); if (db) (void)(db->close)(db); return (ret); }