mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
4be4929c2b
DANGER WILL ROBINSON! _PATH_UNIX is currently defined as the literal string "don't use this". I am of two minds about this myself, but wanted to get something into the tree as quickly as possible.
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/*-
|
|
* 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
|
|
static char sccsid[] = "@(#)testdb.c 8.1 (Berkeley) 6/6/93";
|
|
#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()
|
|
{
|
|
register DB *db;
|
|
register int cc, kd, ret, dbversionlen;
|
|
register char *cp, *uf;
|
|
DBT rec;
|
|
struct nlist nitem;
|
|
char dbname[MAXPATHLEN], dbversion[_POSIX2_LINE_MAX];
|
|
char kversion[_POSIX2_LINE_MAX];
|
|
|
|
ret = 0;
|
|
db = NULL;
|
|
|
|
if ((kd = open(_PATH_KMEM, O_RDONLY, 0)) < 0)
|
|
goto close;
|
|
|
|
uf = (char *)getbootfile();
|
|
if ((cp = rindex(uf, '/')) != 0)
|
|
uf = cp + 1;
|
|
(void) snprintf(dbname, sizeof(dbname), "%skvm_%s.db", _PATH_VARDB, uf);
|
|
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 > sizeof(dbversion))
|
|
goto close;
|
|
bcopy(rec.data, dbversion, 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;
|
|
bcopy(rec.data, &nitem, 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 = bcmp(dbversion, kversion, dbversionlen) == 0;
|
|
|
|
close: if (kd >= 0)
|
|
(void)close(kd);
|
|
if (db)
|
|
(void)(db->close)(db);
|
|
return (ret);
|
|
}
|