/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2007 Diomidis Spinellis
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/cdefs.h>
#include <sys/types.h>
#include <sys/acct.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <db.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "extern.h"
/* Key used to store the version of the database data elements. */
static char VERSION_KEY[] = "\0VERSION";
/*
* Create the in-memory database, *mdb.
* If iflag is not set, fill-in mdb with the records of the disk-based
* database dbname.
* Upgrade old-version records by calling v1_to_v2.
* Return 0 if OK, -1 on error.
*/
int
db_copy_in(DB **mdb, const char *dbname, const char *uname, BTREEINFO *bti,
int (*v1_to_v2)(DBT *key, DBT *data))
{
DBT key, data;
DB *ddb;
int error, rv, version;
if ((*mdb = dbopen(NULL, O_RDWR, 0, DB_BTREE, bti)) == NULL)
return (-1);
if (iflag)
return (0);
if ((ddb = dbopen(dbname, O_RDONLY, 0, DB_BTREE, bti)) == NULL) {
if (errno == ENOENT)
return (0);
warn("retrieving %s summary", uname);
db_destroy(*mdb, uname);
return (-1);
}
error = 0;
/* Obtain/set version. */
version = 1;
key.data = (void*)&VERSION_KEY;
key.size = sizeof(VERSION_KEY);
rv = DB_GET(ddb, &key, &data, 0);
if (rv < 0) {
warn("get version key from %s stats", uname);
error = -1;
goto closeout;
} else if (rv == 0) { /* It's there; verify version. */
if (data.size != sizeof(version)) {
warnx("invalid version size %zd in %s",
data.size, uname);
error = -1;
goto closeout;
}
memcpy(&version, data.data, data.size);
if (version != 2) {
warnx("unsupported version %d in %s",
version, uname);
error = -1;
goto closeout;
}
}
for (rv = DB_SEQ(ddb, &key, &data, R_FIRST); rv == 0;
rv = DB_SEQ(ddb, &key, &data, R_NEXT)) {
/* See if this is a version record. */
if (key.size == sizeof(VERSION_KEY) &&
memcmp(key.data, VERSION_KEY, sizeof(VERSION_KEY)) == 0)
continue;
/* Convert record from v1, if needed. */
if (version == 1 && v1_to_v2(&key, &data) < 0) {
warn("converting %s stats", uname);
error = -1;
goto closeout;
}
/* Copy record to the in-memory database. */
if ((rv = DB_PUT(*mdb, &key, &data, 0)) < 0) {
warn("initializing %s stats", uname);
error = -1;
goto closeout;
}
}
if (rv < 0) {
warn("retrieving %s summary", uname);
error = -1;
}
closeout:
if (DB_CLOSE(ddb) < 0) {
warn("closing %s summary", uname);
error = -1;
}
if (error)
db_destroy(*mdb, uname);
return (error);
}
/*
* Save the in-memory database mdb to the disk database dbname.
* Return 0 if OK, -1 on error.
*/
int
db_copy_out(DB *mdb, const char *dbname, const char *uname, BTREEINFO *bti)
{
DB *ddb;
DBT key, data;
int error, rv, version;
if ((ddb = dbopen(dbname, O_RDWR|O_CREAT|O_TRUNC, 0644,
DB_BTREE, bti)) == NULL) {
warn("creating %s summary", uname);
return (-1);
}
error = 0;
for (rv = DB_SEQ(mdb, &key, &data, R_FIRST);
rv == 0; rv = DB_SEQ(mdb, &key, &data, R_NEXT)) {
if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
warn("saving %s summary", uname);
error = -1;
goto out;
}
}
if (rv < 0) {
warn("retrieving %s stats", uname);
error = -1;
}
out:
/* Add a version record. */
key.data = (void*)&VERSION_KEY;
key.size = sizeof(VERSION_KEY);
version = 2;
data.data = &version;
data.size = sizeof(version);
if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
warn("add version record to %s stats", uname);
error = -1;
} else if (rv == 1) {
warnx("duplicate version record in %s stats", uname);
error = -1;
}
if (DB_SYNC(ddb, 0) < 0) {
warn("syncing %s summary", uname);
error = -1;
}
if (DB_CLOSE(ddb) < 0) {
warn("closing %s summary", uname);
error = -1;
}
return error;
}
void
db_destroy(DB *db, const char *uname)
{
if (DB_CLOSE(db) < 0)
warn("destroying %s stats", uname);
}
plain