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/* ctxcsn.c -- Context CSN Management Routines */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2003-2021 The OpenLDAP Foundation.
* Portions Copyright 2003 IBM Corporation.
* 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/string.h>
#include <ac/socket.h>
#include "lutil.h"
#include "slap.h"
#include "lutil_ldap.h"
const struct berval slap_ldapsync_bv = BER_BVC("ldapsync");
const struct berval slap_ldapsync_cn_bv = BER_BVC("cn=ldapsync");
int slap_serverID;
/* maxcsn->bv_val must point to a char buf[LDAP_PVT_CSNSTR_BUFSIZE] */
void
slap_get_commit_csn(
Operation *op,
struct berval *maxcsn,
int *foundit
)
{
struct slap_csn_entry *csne, *committed_csne = NULL;
BackendDB *be = op->o_bd->bd_self;
int sid = -1;
if ( maxcsn ) {
assert( maxcsn->bv_val != NULL );
assert( maxcsn->bv_len >= LDAP_PVT_CSNSTR_BUFSIZE );
}
if ( foundit ) {
*foundit = 0;
}
ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
if ( !BER_BVISEMPTY( &op->o_csn )) {
sid = slap_parse_csn_sid( &op->o_csn );
}
LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
if ( csne->ce_op == op ) {
csne->ce_state = SLAP_CSN_COMMIT;
if ( foundit ) *foundit = 1;
break;
}
}
LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
if ( sid != -1 && sid == csne->ce_sid ) {
if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
if ( csne->ce_state == SLAP_CSN_PENDING ) break;
}
}
if ( maxcsn ) {
if ( committed_csne ) {
if ( committed_csne->ce_csn.bv_len < maxcsn->bv_len )
maxcsn->bv_len = committed_csne->ce_csn.bv_len;
AC_MEMCPY( maxcsn->bv_val, committed_csne->ce_csn.bv_val,
maxcsn->bv_len+1 );
} else {
maxcsn->bv_len = 0;
maxcsn->bv_val[0] = 0;
}
}
ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
}
void
slap_rewind_commit_csn( Operation *op )
{
struct slap_csn_entry *csne;
BackendDB *be = op->o_bd->bd_self;
ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
if ( csne->ce_op == op ) {
csne->ce_state = SLAP_CSN_PENDING;
break;
}
}
ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
}
void
slap_graduate_commit_csn( Operation *op )
{
struct slap_csn_entry *csne;
BackendDB *be;
if ( op == NULL ) return;
if ( op->o_bd == NULL ) return;
be = op->o_bd->bd_self;
ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
if ( csne->ce_op == op ) {
LDAP_TAILQ_REMOVE( be->be_pending_csn_list,
csne, ce_csn_link );
Debug( LDAP_DEBUG_SYNC, "slap_graduate_commit_csn: removing %p %s\n",
csne, csne->ce_csn.bv_val, 0 );
if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
BER_BVZERO( &op->o_csn );
}
ch_free( csne->ce_csn.bv_val );
ch_free( csne );
break;
}
}
ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
return;
}
static struct berval ocbva[] = {
BER_BVC("top"),
BER_BVC("subentry"),
BER_BVC("syncProviderSubentry"),
BER_BVNULL
};
Entry *
slap_create_context_csn_entry(
Backend *be,
struct berval *context_csn )
{
Entry* e;
struct berval bv;
e = entry_alloc();
attr_merge( e, slap_schema.si_ad_objectClass,
ocbva, NULL );
attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
&ocbva[1], NULL );
attr_merge_one( e, slap_schema.si_ad_cn,
(struct berval *)&slap_ldapsync_bv, NULL );
if ( context_csn ) {
attr_merge_one( e, slap_schema.si_ad_contextCSN,
context_csn, NULL );
}
BER_BVSTR( &bv, "{}" );
attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
build_new_dn( &e->e_name, &be->be_nsuffix[0],
(struct berval *)&slap_ldapsync_cn_bv, NULL );
ber_dupbv( &e->e_nname, &e->e_name );
return e;
}
void
slap_queue_csn(
Operation *op,
struct berval *csn )
{
struct slap_csn_entry *pending;
BackendDB *be = op->o_bd->bd_self;
pending = (struct slap_csn_entry *) ch_calloc( 1,
sizeof( struct slap_csn_entry ));
Debug( LDAP_DEBUG_SYNC, "slap_queue_csn: queueing %p %s\n", pending, csn->bv_val, 0 );
ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
ber_dupbv( &pending->ce_csn, csn );
ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
pending->ce_sid = slap_parse_csn_sid( csn );
pending->ce_op = op;
pending->ce_state = SLAP_CSN_PENDING;
LDAP_TAILQ_INSERT_TAIL( be->be_pending_csn_list,
pending, ce_csn_link );
ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
}
int
slap_get_csn(
Operation *op,
struct berval *csn,
int manage_ctxcsn )
{
if ( csn == NULL ) return LDAP_OTHER;
csn->bv_len = ldap_pvt_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
Debug( LDAP_DEBUG_SYNC, "slap_get_csn: %s generated new csn=%s manage=%d\n",
op->o_log_prefix, csn->bv_val, manage_ctxcsn );
if ( manage_ctxcsn )
slap_queue_csn( op, csn );
return LDAP_SUCCESS;
}
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