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/* dbcache.c - manage cache of open databases */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2000-2021 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/time.h>
#include <sys/stat.h>
#include "slap.h"
#include "back-bdb.h"
#include "lutil_hash.h"
#ifdef BDB_INDEX_USE_HASH
/* Pass-thru hash function. Since the indexer is already giving us hash
* values as keys, we don't need BDB to re-hash them.
*/
static u_int32_t
bdb_db_hash(
DB *db,
const void *bytes,
u_int32_t length
)
{
u_int32_t ret = 0;
unsigned char *dst = (unsigned char *)&ret;
const unsigned char *src = (const unsigned char *)bytes;
if ( length > sizeof(u_int32_t) )
length = sizeof(u_int32_t);
while ( length ) {
*dst++ = *src++;
length--;
}
return ret;
}
#define BDB_INDEXTYPE DB_HASH
#else
#define BDB_INDEXTYPE DB_BTREE
#endif
/* If a configured size is found, return it, otherwise return 0 */
int
bdb_db_findsize(
struct bdb_info *bdb,
struct berval *name
)
{
struct bdb_db_pgsize *bp;
int rc;
for ( bp = bdb->bi_pagesizes; bp; bp=bp->bdp_next ) {
rc = strncmp( name->bv_val, bp->bdp_name.bv_val, name->bv_len );
if ( !rc ) {
if ( name->bv_len == bp->bdp_name.bv_len )
return bp->bdp_size;
if ( name->bv_len < bp->bdp_name.bv_len &&
bp->bdp_name.bv_val[name->bv_len] == '.' )
return bp->bdp_size;
}
}
return 0;
}
int
bdb_db_cache(
Backend *be,
struct berval *name,
DB **dbout )
{
int i, flags;
int rc;
struct bdb_info *bdb = (struct bdb_info *) be->be_private;
struct bdb_db_info *db;
char *file;
*dbout = NULL;
for( i=BDB_NDB; i < bdb->bi_ndatabases; i++ ) {
if( !ber_bvcmp( &bdb->bi_databases[i]->bdi_name, name) ) {
*dbout = bdb->bi_databases[i]->bdi_db;
return 0;
}
}
ldap_pvt_thread_mutex_lock( &bdb->bi_database_mutex );
/* check again! may have been added by another thread */
for( i=BDB_NDB; i < bdb->bi_ndatabases; i++ ) {
if( !ber_bvcmp( &bdb->bi_databases[i]->bdi_name, name) ) {
*dbout = bdb->bi_databases[i]->bdi_db;
ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
return 0;
}
}
if( i >= BDB_INDICES ) {
ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
return -1;
}
db = (struct bdb_db_info *) ch_calloc(1, sizeof(struct bdb_db_info));
ber_dupbv( &db->bdi_name, name );
rc = db_create( &db->bdi_db, bdb->bi_dbenv, 0 );
if( rc != 0 ) {
Debug( LDAP_DEBUG_ANY,
"bdb_db_cache: db_create(%s) failed: %s (%d)\n",
bdb->bi_dbenv_home, db_strerror(rc), rc );
ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
ch_free( db );
return rc;
}
if( !BER_BVISNULL( &bdb->bi_db_crypt_key )) {
rc = db->bdi_db->set_flags( db->bdi_db, DB_ENCRYPT );
if ( rc ) {
Debug( LDAP_DEBUG_ANY,
"bdb_db_cache: db set_flags(DB_ENCRYPT)(%s) failed: %s (%d)\n",
bdb->bi_dbenv_home, db_strerror(rc), rc );
ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
db->bdi_db->close( db->bdi_db, 0 );
ch_free( db );
return rc;
}
}
if( bdb->bi_flags & BDB_CHKSUM ) {
rc = db->bdi_db->set_flags( db->bdi_db, DB_CHKSUM );
if ( rc ) {
Debug( LDAP_DEBUG_ANY,
"bdb_db_cache: db set_flags(DB_CHKSUM)(%s) failed: %s (%d)\n",
bdb->bi_dbenv_home, db_strerror(rc), rc );
ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
db->bdi_db->close( db->bdi_db, 0 );
ch_free( db );
return rc;
}
}
/* If no explicit size set, use the FS default */
flags = bdb_db_findsize( bdb, name );
if ( flags )
rc = db->bdi_db->set_pagesize( db->bdi_db, flags );
#ifdef BDB_INDEX_USE_HASH
rc = db->bdi_db->set_h_hash( db->bdi_db, bdb_db_hash );
#endif
rc = db->bdi_db->set_flags( db->bdi_db, DB_DUP | DB_DUPSORT );
file = ch_malloc( db->bdi_name.bv_len + sizeof(BDB_SUFFIX) );
strcpy( file, db->bdi_name.bv_val );
strcpy( file+db->bdi_name.bv_len, BDB_SUFFIX );
#ifdef HAVE_EBCDIC
__atoe( file );
#endif
flags = DB_CREATE | DB_THREAD;
#ifdef DB_AUTO_COMMIT
if ( !( slapMode & SLAP_TOOL_QUICK ))
flags |= DB_AUTO_COMMIT;
#endif
/* Cannot Truncate when Transactions are in use */
if ( (slapMode & (SLAP_TOOL_QUICK|SLAP_TRUNCATE_MODE)) ==
(SLAP_TOOL_QUICK|SLAP_TRUNCATE_MODE))
flags |= DB_TRUNCATE;
rc = DB_OPEN( db->bdi_db,
file, NULL /* name */,
BDB_INDEXTYPE, bdb->bi_db_opflags | flags, bdb->bi_dbenv_mode );
ch_free( file );
if( rc != 0 ) {
Debug( LDAP_DEBUG_ANY,
"bdb_db_cache: db_open(%s) failed: %s (%d)\n",
name->bv_val, db_strerror(rc), rc );
ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
db->bdi_db->close( db->bdi_db, 0 );
ch_free( db );
return rc;
}
bdb->bi_databases[i] = db;
bdb->bi_ndatabases = i+1;
*dbout = db->bdi_db;
ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
return 0;
}
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