Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/servers/slapd/ctxcsn.c b/servers/slapd/ctxcsn.c
new file mode 100644
index 0000000..5d69ca8
--- /dev/null
+++ b/servers/slapd/ctxcsn.c
@@ -0,0 +1,218 @@
+/* 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;
+}