Adding upstream version 2.4.47+dfsg.upstream/2.4.47+dfsgupstream

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

1 files changed, 1574 insertions, 0 deletions

diff --git a/servers/slapd/overlays/dynlist.c b/servers/slapd/overlays/dynlist.c
new file mode 100644
index 0000000..6293889
--- /dev/null
+++ b/servers/slapd/overlays/dynlist.c
@@ -0,0 +1,1574 @@
+/* dynlist.c - dynamic list overlay */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2003-2018 The OpenLDAP Foundation.
+ * Portions Copyright 2004-2005 Pierangelo Masarati.
+ * Portions Copyright 2008 Emmanuel Dreyfus.
+ * 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>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was initially developed by Pierangelo Masarati
+ * for SysNet s.n.c., for inclusion in OpenLDAP Software.
+ */
+
+#include "portable.h"
+
+#ifdef SLAPD_OVER_DYNLIST
+
+#if SLAPD_OVER_DYNGROUP != SLAPD_MOD_STATIC
+#define TAKEOVER_DYNGROUP
+#endif
+
+#include <stdio.h>
+
+#include <ac/string.h>
+
+#include "slap.h"
+#include "config.h"
+#include "lutil.h"
+
+static AttributeDescription *ad_dgIdentity, *ad_dgAuthz;
+
+typedef struct dynlist_map_t {
+	AttributeDescription	*dlm_member_ad;
+	AttributeDescription	*dlm_mapped_ad;
+	struct dynlist_map_t	*dlm_next;
+} dynlist_map_t;
+
+typedef struct dynlist_info_t {
+	ObjectClass		*dli_oc;
+	AttributeDescription	*dli_ad;
+	struct dynlist_map_t	*dli_dlm;
+	struct berval		dli_uri;
+	LDAPURLDesc		*dli_lud;
+	struct berval		dli_uri_nbase;
+	Filter			*dli_uri_filter;
+	struct berval		dli_default_filter;
+	struct dynlist_info_t	*dli_next;
+} dynlist_info_t;
+
+#define DYNLIST_USAGE \
+	"\"dynlist-attrset <oc> [uri] <URL-ad> [[<mapped-ad>:]<member-ad> ...]\": "
+
+static dynlist_info_t *
+dynlist_is_dynlist_next( Operation *op, SlapReply *rs, dynlist_info_t *old_dli )
+{
+	slap_overinst	*on = (slap_overinst *)op->o_bd->bd_info;
+	dynlist_info_t	*dli;
+
+	Attribute	*a;
+
+	if ( old_dli == NULL ) {
+		dli = (dynlist_info_t *)on->on_bi.bi_private;
+
+	} else {
+		dli = old_dli->dli_next;
+	}
+
+	a = attrs_find( rs->sr_entry->e_attrs, slap_schema.si_ad_objectClass );
+	if ( a == NULL ) {
+		/* FIXME: objectClass must be present; for non-storage
+		 * backends, like back-ldap, it needs to be added
+		 * to the requested attributes */
+		return NULL;
+	}
+
+	for ( ; dli; dli = dli->dli_next ) {
+		if ( dli->dli_lud != NULL ) {
+			/* check base and scope */
+			if ( !BER_BVISNULL( &dli->dli_uri_nbase )
+				&& !dnIsSuffixScope( &rs->sr_entry->e_nname,
+					&dli->dli_uri_nbase,
+					dli->dli_lud->lud_scope ) )
+			{
+				continue;
+			}
+
+			/* check filter */
+			if ( dli->dli_uri_filter && test_filter( op, rs->sr_entry, dli->dli_uri_filter ) != LDAP_COMPARE_TRUE ) {
+				continue;
+			}
+		}
+
+		if ( attr_valfind( a,
+				SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
+				SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
+				&dli->dli_oc->soc_cname, NULL,
+				op->o_tmpmemctx ) == 0 )
+		{
+			return dli;
+		}
+	}
+
+	return NULL;
+}
+
+static int
+dynlist_make_filter( Operation *op, Entry *e, const char *url, struct berval *oldf, struct berval *newf )
+{
+	slap_overinst	*on = (slap_overinst *)op->o_bd->bd_info;
+	dynlist_info_t	*dli = (dynlist_info_t *)on->on_bi.bi_private;
+
+	char		*ptr;
+	int		needBrackets = 0;
+
+	assert( oldf != NULL );
+	assert( newf != NULL );
+	assert( !BER_BVISNULL( oldf ) );
+	assert( !BER_BVISEMPTY( oldf ) );
+
+	if ( oldf->bv_val[0] != '(' ) {
+		Debug( LDAP_DEBUG_ANY, "%s: dynlist, DN=\"%s\": missing brackets in URI=\"%s\" filter\n",
+			op->o_log_prefix, e->e_name.bv_val, url );
+		needBrackets = 2;
+	}
+
+	newf->bv_len = STRLENOF( "(&(!(objectClass=" "))" ")" )
+		+ dli->dli_oc->soc_cname.bv_len + oldf->bv_len + needBrackets;
+	newf->bv_val = op->o_tmpalloc( newf->bv_len + 1, op->o_tmpmemctx );
+	if ( newf->bv_val == NULL ) {
+		return -1;
+	}
+	ptr = lutil_strcopy( newf->bv_val, "(&(!(objectClass=" );
+	ptr = lutil_strcopy( ptr, dli->dli_oc->soc_cname.bv_val );
+	ptr = lutil_strcopy( ptr, "))" );
+	if ( needBrackets ) *ptr++ = '(';
+	ptr = lutil_strcopy( ptr, oldf->bv_val );
+	if ( needBrackets ) *ptr++ = ')';
+	ptr = lutil_strcopy( ptr, ")" );
+	newf->bv_len = ptr - newf->bv_val;
+
+	return 0;
+}
+
+/* dynlist_sc_update() callback info set by dynlist_prepare_entry() */
+typedef struct dynlist_sc_t {
+	dynlist_info_t    *dlc_dli;
+	Entry		*dlc_e;
+} dynlist_sc_t;
+
+static int
+dynlist_sc_update( Operation *op, SlapReply *rs )
+{
+	Entry			*e;
+	Attribute		*a;
+	int			opattrs,
+				userattrs;
+	AccessControlState	acl_state = ACL_STATE_INIT;
+
+	dynlist_sc_t		*dlc;
+	dynlist_map_t		*dlm;
+
+	if ( rs->sr_type != REP_SEARCH ) {
+		return 0;
+	}
+
+	dlc = (dynlist_sc_t *)op->o_callback->sc_private;
+	e = dlc->dlc_e;
+
+	assert( e != NULL );
+	assert( rs->sr_entry != NULL );
+
+	/* test access to entry */
+	if ( !access_allowed( op, rs->sr_entry, slap_schema.si_ad_entry,
+				NULL, ACL_READ, NULL ) )
+	{
+		goto done;
+	}
+
+	/* if there is only one member_ad, and it's not mapped,
+	 * consider it as old-style member listing */
+	dlm = dlc->dlc_dli->dli_dlm;
+	if ( dlm && dlm->dlm_mapped_ad == NULL && dlm->dlm_next == NULL ) {
+		/* if access allowed, try to add values, emulating permissive
+		 * control to silently ignore duplicates */
+		if ( access_allowed( op, rs->sr_entry, slap_schema.si_ad_entry,
+					NULL, ACL_READ, NULL ) )
+		{
+			Modification	mod;
+			const char	*text = NULL;
+			char		textbuf[1024];
+			struct berval	vals[ 2 ], nvals[ 2 ];
+
+			vals[ 0 ] = rs->sr_entry->e_name;
+			BER_BVZERO( &vals[ 1 ] );
+			nvals[ 0 ] = rs->sr_entry->e_nname;
+			BER_BVZERO( &nvals[ 1 ] );
+
+			mod.sm_op = LDAP_MOD_ADD;
+			mod.sm_desc = dlm->dlm_member_ad;
+			mod.sm_type = dlm->dlm_member_ad->ad_cname;
+			mod.sm_values = vals;
+			mod.sm_nvalues = nvals;
+			mod.sm_numvals = 1;
+
+			(void)modify_add_values( e, &mod, /* permissive */ 1,
+					&text, textbuf, sizeof( textbuf ) );
+		}
+
+		goto done;
+	}
+
+	opattrs = SLAP_OPATTRS( rs->sr_attr_flags );
+	userattrs = SLAP_USERATTRS( rs->sr_attr_flags );
+
+	for ( a = rs->sr_entry->e_attrs; a != NULL; a = a->a_next ) {
+		BerVarray	vals, nvals = NULL;
+		int		i, j,
+				is_oc = a->a_desc == slap_schema.si_ad_objectClass;
+
+		/* if attribute is not requested, skip it */
+		if ( rs->sr_attrs == NULL ) {
+			if ( is_at_operational( a->a_desc->ad_type ) ) {
+				continue;
+			}
+
+		} else {
+			if ( is_at_operational( a->a_desc->ad_type ) ) {
+				if ( !opattrs && !ad_inlist( a->a_desc, rs->sr_attrs ) )
+				{
+					continue;
+				}
+
+			} else {
+				if ( !userattrs && !ad_inlist( a->a_desc, rs->sr_attrs ) )
+				{
+					continue;
+				}
+			}
+		}
+
+		/* test access to attribute */
+		if ( op->ors_attrsonly ) {
+			if ( !access_allowed( op, rs->sr_entry, a->a_desc, NULL,
+						ACL_READ, &acl_state ) )
+			{
+				continue;
+			}
+		}
+
+		/* single-value check: keep first only */
+		if ( is_at_single_value( a->a_desc->ad_type ) ) {
+			if ( attr_find( e->e_attrs, a->a_desc ) != NULL ) {
+				continue;
+			}
+		}
+
+		/* test access to attribute */
+		i = a->a_numvals;
+
+		vals = op->o_tmpalloc( ( i + 1 ) * sizeof( struct berval ), op->o_tmpmemctx );
+		if ( a->a_nvals != a->a_vals ) {
+			nvals = op->o_tmpalloc( ( i + 1 ) * sizeof( struct berval ), op->o_tmpmemctx );
+		}
+
+		for ( i = 0, j = 0; !BER_BVISNULL( &a->a_vals[i] ); i++ ) {
+			if ( is_oc ) {
+				ObjectClass	*soc = oc_bvfind( &a->a_vals[i] );
+
+				if ( soc->soc_kind == LDAP_SCHEMA_STRUCTURAL ) {
+					continue;
+				}
+			}
+
+			if ( access_allowed( op, rs->sr_entry, a->a_desc,
+						&a->a_nvals[i], ACL_READ, &acl_state ) )
+			{
+				vals[j] = a->a_vals[i];
+				if ( nvals ) {
+					nvals[j] = a->a_nvals[i];
+				}
+				j++;
+			}
+		}
+
+		/* if access allowed, try to add values, emulating permissive
+		 * control to silently ignore duplicates */
+		if ( j != 0 ) {
+			Modification	mod;
+			const char	*text = NULL;
+			char		textbuf[1024];
+			dynlist_map_t	*dlm;
+			AttributeDescription *ad;
+
+			BER_BVZERO( &vals[j] );
+			if ( nvals ) {
+				BER_BVZERO( &nvals[j] );
+			}
+
+			ad = a->a_desc;
+			for ( dlm = dlc->dlc_dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
+				if ( dlm->dlm_member_ad == a->a_desc ) {
+					if ( dlm->dlm_mapped_ad ) {
+						ad = dlm->dlm_mapped_ad;
+					}
+					break;
+				}
+			}
+
+			mod.sm_op = LDAP_MOD_ADD;
+			mod.sm_desc = ad;
+			mod.sm_type = ad->ad_cname;
+			mod.sm_values = vals;
+			mod.sm_nvalues = nvals;
+			mod.sm_numvals = j;
+
+			(void)modify_add_values( e, &mod, /* permissive */ 1,
+					&text, textbuf, sizeof( textbuf ) );
+		}
+
+		op->o_tmpfree( vals, op->o_tmpmemctx );
+		if ( nvals ) {
+			op->o_tmpfree( nvals, op->o_tmpmemctx );
+		}
+	}
+
+done:;
+	if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
+		entry_free( rs->sr_entry );
+		rs->sr_entry = NULL;
+		rs->sr_flags &= ~REP_ENTRY_MASK;
+	}
+
+	return 0;
+}
+	
+static int
+dynlist_prepare_entry( Operation *op, SlapReply *rs, dynlist_info_t *dli )
+{
+	Attribute	*a, *id = NULL;
+	slap_callback	cb = { 0 };
+	Operation	o = *op;
+	struct berval	*url;
+	Entry		*e;
+	int		opattrs,
+			userattrs;
+	dynlist_sc_t	dlc = { 0 };
+	dynlist_map_t	*dlm;
+
+	a = attrs_find( rs->sr_entry->e_attrs, dli->dli_ad );
+	if ( a == NULL ) {
+		/* FIXME: error? */
+		return SLAP_CB_CONTINUE;
+	}
+
+	opattrs = SLAP_OPATTRS( rs->sr_attr_flags );
+	userattrs = SLAP_USERATTRS( rs->sr_attr_flags );
+
+	/* Don't generate member list if it wasn't requested */
+	for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
+		AttributeDescription *ad = dlm->dlm_mapped_ad ? dlm->dlm_mapped_ad : dlm->dlm_member_ad;
+		if ( userattrs || ad_inlist( ad, rs->sr_attrs ) ) 
+			break;
+	}
+	if ( dli->dli_dlm && !dlm )
+		return SLAP_CB_CONTINUE;
+
+	if ( ad_dgIdentity && ( id = attrs_find( rs->sr_entry->e_attrs, ad_dgIdentity ))) {
+		Attribute *authz = NULL;
+
+		/* if not rootdn and dgAuthz is present,
+		 * check if user can be authorized as dgIdentity */
+		if ( ad_dgAuthz && !BER_BVISEMPTY( &id->a_nvals[0] ) && !be_isroot( op )
+			&& ( authz = attrs_find( rs->sr_entry->e_attrs, ad_dgAuthz ) ) )
+		{
+			if ( slap_sasl_matches( op, authz->a_nvals,
+				&o.o_ndn, &o.o_ndn ) != LDAP_SUCCESS )
+			{
+				return SLAP_CB_CONTINUE;
+			}
+		}
+
+		o.o_dn = id->a_vals[0];
+		o.o_ndn = id->a_nvals[0];
+		o.o_groups = NULL;
+	}
+
+	e = rs->sr_entry;
+	/* ensure e is modifiable, but do not replace
+	 * sr_entry yet since we have pointers into it */
+	if ( !( rs->sr_flags & REP_ENTRY_MODIFIABLE ) ) {
+		e = entry_dup( rs->sr_entry );
+	}
+
+	dlc.dlc_e = e;
+	dlc.dlc_dli = dli;
+	cb.sc_private = &dlc;
+	cb.sc_response = dynlist_sc_update;
+
+	o.o_callback = &cb;
+	o.ors_deref = LDAP_DEREF_NEVER;
+	o.ors_limit = NULL;
+	o.ors_tlimit = SLAP_NO_LIMIT;
+	o.ors_slimit = SLAP_NO_LIMIT;
+
+	for ( url = a->a_nvals; !BER_BVISNULL( url ); url++ ) {
+		LDAPURLDesc	*lud = NULL;
+		int		i, j;
+		struct berval	dn;
+		int		rc;
+
+		BER_BVZERO( &o.o_req_dn );
+		BER_BVZERO( &o.o_req_ndn );
+		o.ors_filter = NULL;
+		o.ors_attrs = NULL;
+		BER_BVZERO( &o.ors_filterstr );
+
+		if ( ldap_url_parse( url->bv_val, &lud ) != LDAP_URL_SUCCESS ) {
+			/* FIXME: error? */
+			continue;
+		}
+
+		if ( lud->lud_host != NULL ) {
+			/* FIXME: host not allowed; reject as illegal? */
+			Debug( LDAP_DEBUG_ANY, "dynlist_prepare_entry(\"%s\"): "
+				"illegal URI \"%s\"\n",
+				e->e_name.bv_val, url->bv_val, 0 );
+			goto cleanup;
+		}
+
+		if ( lud->lud_dn == NULL ) {
+			/* note that an empty base is not honored in terms
+			 * of defaultSearchBase, because select_backend()
+			 * is not aware of the defaultSearchBase option;
+			 * this can be useful in case of a database serving
+			 * the empty suffix */
+			BER_BVSTR( &dn, "" );
+
+		} else {
+			ber_str2bv( lud->lud_dn, 0, 0, &dn );
+		}
+		rc = dnPrettyNormal( NULL, &dn, &o.o_req_dn, &o.o_req_ndn, op->o_tmpmemctx );
+		if ( rc != LDAP_SUCCESS ) {
+			/* FIXME: error? */
+			goto cleanup;
+		}
+		o.ors_scope = lud->lud_scope;
+
+		for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
+			if ( dlm->dlm_mapped_ad != NULL ) {
+				break;
+			}
+		}
+
+		if ( dli->dli_dlm && !dlm ) {
+			/* if ( lud->lud_attrs != NULL ),
+			 * the URL should be ignored */
+			o.ors_attrs = slap_anlist_no_attrs;
+
+		} else if ( lud->lud_attrs == NULL ) {
+			o.ors_attrs = rs->sr_attrs;
+
+		} else {
+			for ( i = 0; lud->lud_attrs[i]; i++)
+				/* just count */ ;
+
+			o.ors_attrs = op->o_tmpcalloc( i + 1, sizeof( AttributeName ), op->o_tmpmemctx );
+			for ( i = 0, j = 0; lud->lud_attrs[i]; i++) {
+				const char	*text = NULL;
+	
+				ber_str2bv( lud->lud_attrs[i], 0, 0, &o.ors_attrs[j].an_name );
+				o.ors_attrs[j].an_desc = NULL;
+				(void)slap_bv2ad( &o.ors_attrs[j].an_name, &o.ors_attrs[j].an_desc, &text );
+				/* FIXME: ignore errors... */
+
+				if ( rs->sr_attrs == NULL ) {
+					if ( o.ors_attrs[j].an_desc != NULL &&
+							is_at_operational( o.ors_attrs[j].an_desc->ad_type ) )
+					{
+						continue;
+					}
+
+				} else {
+					if ( o.ors_attrs[j].an_desc != NULL &&
+							is_at_operational( o.ors_attrs[j].an_desc->ad_type ) )
+					{
+						if ( !opattrs ) {
+							continue;
+						}
+
+						if ( !ad_inlist( o.ors_attrs[j].an_desc, rs->sr_attrs ) ) {
+							/* lookup if mapped -- linear search,
+							 * not very efficient unless list
+							 * is very short */
+							for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
+								if ( dlm->dlm_member_ad == o.ors_attrs[j].an_desc ) {
+									break;
+								}
+							}
+
+							if ( dlm == NULL ) {
+								continue;
+							}
+						}
+
+					} else {
+						if ( !userattrs && 
+								o.ors_attrs[j].an_desc != NULL &&
+								!ad_inlist( o.ors_attrs[j].an_desc, rs->sr_attrs ) )
+						{
+							/* lookup if mapped -- linear search,
+							 * not very efficient unless list
+							 * is very short */
+							for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
+								if ( dlm->dlm_member_ad == o.ors_attrs[j].an_desc ) {
+									break;
+								}
+							}
+
+							if ( dlm == NULL ) {
+								continue;
+							}
+						}
+					}
+				}
+
+				j++;
+			}
+
+			if ( j == 0 ) {
+				goto cleanup;
+			}
+		
+			BER_BVZERO( &o.ors_attrs[j].an_name );
+		}
+
+		if ( lud->lud_filter == NULL ) {
+			ber_dupbv_x( &o.ors_filterstr,
+					&dli->dli_default_filter, op->o_tmpmemctx );
+
+		} else {
+			struct berval	flt;
+			ber_str2bv( lud->lud_filter, 0, 0, &flt );
+			if ( dynlist_make_filter( op, rs->sr_entry, url->bv_val, &flt, &o.ors_filterstr ) ) {
+				/* error */
+				goto cleanup;
+			}
+		}
+		o.ors_filter = str2filter_x( op, o.ors_filterstr.bv_val );
+		if ( o.ors_filter == NULL ) {
+			goto cleanup;
+		}
+		
+		o.o_bd = select_backend( &o.o_req_ndn, 1 );
+		if ( o.o_bd && o.o_bd->be_search ) {
+			SlapReply	r = { REP_SEARCH };
+			r.sr_attr_flags = slap_attr_flags( o.ors_attrs );
+			(void)o.o_bd->be_search( &o, &r );
+		}
+
+cleanup:;
+		if ( id ) {
+			slap_op_groups_free( &o );
+		}
+		if ( o.ors_filter ) {
+			filter_free_x( &o, o.ors_filter, 1 );
+		}
+		if ( o.ors_attrs && o.ors_attrs != rs->sr_attrs
+				&& o.ors_attrs != slap_anlist_no_attrs )
+		{
+			op->o_tmpfree( o.ors_attrs, op->o_tmpmemctx );
+		}
+		if ( !BER_BVISNULL( &o.o_req_dn ) ) {
+			op->o_tmpfree( o.o_req_dn.bv_val, op->o_tmpmemctx );
+		}
+		if ( !BER_BVISNULL( &o.o_req_ndn ) ) {
+			op->o_tmpfree( o.o_req_ndn.bv_val, op->o_tmpmemctx );
+		}
+		assert( BER_BVISNULL( &o.ors_filterstr )
+			|| o.ors_filterstr.bv_val != lud->lud_filter );
+		op->o_tmpfree( o.ors_filterstr.bv_val, op->o_tmpmemctx );
+		ldap_free_urldesc( lud );
+	}
+
+	if ( e != rs->sr_entry ) {
+		rs_replace_entry( op, rs, (slap_overinst *)op->o_bd->bd_info, e );
+		rs->sr_flags |= REP_ENTRY_MODIFIABLE | REP_ENTRY_MUSTBEFREED;
+	}
+
+	return SLAP_CB_CONTINUE;
+}
+
+/* dynlist_sc_compare_entry() callback set by dynlist_compare() */
+typedef struct dynlist_cc_t {
+	slap_callback dc_cb;
+#	define dc_ava	dc_cb.sc_private /* attr:val to compare with */
+	int *dc_res;
+} dynlist_cc_t;
+
+static int
+dynlist_sc_compare_entry( Operation *op, SlapReply *rs )
+{
+	if ( rs->sr_type == REP_SEARCH && rs->sr_entry != NULL ) {
+		dynlist_cc_t *dc = (dynlist_cc_t *)op->o_callback;
+		AttributeAssertion *ava = dc->dc_ava;
+		Attribute *a = attrs_find( rs->sr_entry->e_attrs, ava->aa_desc );
+
+		if ( a != NULL ) {
+			while ( LDAP_SUCCESS != attr_valfind( a,
+					SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
+						SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
+					&ava->aa_value, NULL, op->o_tmpmemctx )
+				&& (a = attrs_find( a->a_next, ava->aa_desc )) != NULL )
+				;
+			*dc->dc_res = a ? LDAP_COMPARE_TRUE : LDAP_COMPARE_FALSE;
+		}
+	}
+
+	return 0;
+}
+
+static int
+dynlist_compare( Operation *op, SlapReply *rs )
+{
+	slap_overinst	*on = (slap_overinst *)op->o_bd->bd_info;
+	dynlist_info_t	*dli = (dynlist_info_t *)on->on_bi.bi_private;
+	Operation o = *op;
+	Entry *e = NULL;
+	dynlist_map_t *dlm;
+	BackendDB *be;
+
+	for ( ; dli != NULL; dli = dli->dli_next ) {
+		for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next )
+			if ( op->oq_compare.rs_ava->aa_desc == dlm->dlm_member_ad )
+				break;
+
+		if ( dlm ) {
+			/* This compare is for one of the attributes we're
+			 * interested in. We'll use slapd's existing dyngroup
+			 * evaluator to get the answer we want.
+			 */
+			BerVarray id = NULL, authz = NULL;
+
+			o.o_do_not_cache = 1;
+
+			if ( ad_dgIdentity && backend_attribute( &o, NULL, &o.o_req_ndn,
+				ad_dgIdentity, &id, ACL_READ ) == LDAP_SUCCESS )
+			{
+				/* if not rootdn and dgAuthz is present,
+				 * check if user can be authorized as dgIdentity */
+				if ( ad_dgAuthz && !BER_BVISEMPTY( id ) && !be_isroot( op )
+					&& backend_attribute( &o, NULL, &o.o_req_ndn,
+						ad_dgAuthz, &authz, ACL_READ ) == LDAP_SUCCESS )
+				{
+					
+					rs->sr_err = slap_sasl_matches( op, authz,
+						&o.o_ndn, &o.o_ndn );
+					ber_bvarray_free_x( authz, op->o_tmpmemctx );
+					if ( rs->sr_err != LDAP_SUCCESS ) {
+						goto done;
+					}
+				}
+
+				o.o_dn = *id;
+				o.o_ndn = *id;
+				o.o_groups = NULL; /* authz changed, invalidate cached groups */
+			}
+
+			rs->sr_err = backend_group( &o, NULL, &o.o_req_ndn,
+				&o.oq_compare.rs_ava->aa_value, dli->dli_oc, dli->dli_ad );
+			switch ( rs->sr_err ) {
+			case LDAP_SUCCESS:
+				rs->sr_err = LDAP_COMPARE_TRUE;
+				break;
+
+			case LDAP_NO_SUCH_OBJECT:
+				/* NOTE: backend_group() returns noSuchObject
+				 * if op_ndn does not exist; however, since
+				 * dynamic list expansion means that the
+				 * member attribute is virtually present, the
+				 * non-existence of the asserted value implies
+				 * the assertion is FALSE rather than
+				 * UNDEFINED */
+				rs->sr_err = LDAP_COMPARE_FALSE;
+				break;
+			}
+
+done:;
+			if ( id ) ber_bvarray_free_x( id, o.o_tmpmemctx );
+
+			return SLAP_CB_CONTINUE;
+		}
+	}
+
+	be = select_backend( &o.o_req_ndn, 1 );
+	if ( !be || !be->be_search ) {
+		return SLAP_CB_CONTINUE;
+	}
+
+	if ( overlay_entry_get_ov( &o, &o.o_req_ndn, NULL, NULL, 0, &e, on ) !=
+		LDAP_SUCCESS || e == NULL )
+	{
+		return SLAP_CB_CONTINUE;
+	}
+
+	/* check for dynlist objectClass; done if not found */
+	dli = (dynlist_info_t *)on->on_bi.bi_private;
+	while ( dli != NULL && !is_entry_objectclass_or_sub( e, dli->dli_oc ) ) {
+		dli = dli->dli_next;
+	}
+	if ( dli == NULL ) {
+		goto release;
+	}
+
+	if ( ad_dgIdentity ) {
+		Attribute *id = attrs_find( e->e_attrs, ad_dgIdentity );
+		if ( id ) {
+			Attribute *authz;
+
+			/* if not rootdn and dgAuthz is present,
+			 * check if user can be authorized as dgIdentity */
+			if ( ad_dgAuthz && !BER_BVISEMPTY( &id->a_nvals[0] ) && !be_isroot( op )
+				&& ( authz = attrs_find( e->e_attrs, ad_dgAuthz ) ) )
+			{
+				if ( slap_sasl_matches( op, authz->a_nvals,
+					&o.o_ndn, &o.o_ndn ) != LDAP_SUCCESS )
+				{
+					goto release;
+				}
+			}
+
+			o.o_dn = id->a_vals[0];
+			o.o_ndn = id->a_nvals[0];
+			o.o_groups = NULL;
+		}
+	}
+
+	/* generate dynamic list with dynlist_response() and compare */
+	{
+		SlapReply	r = { REP_SEARCH };
+		dynlist_cc_t	dc = { { 0, dynlist_sc_compare_entry, 0, 0 }, 0 };
+		AttributeName	an[2];
+
+		dc.dc_ava = op->orc_ava;
+		dc.dc_res = &rs->sr_err;
+		o.o_callback = (slap_callback *) &dc;
+
+		o.o_tag = LDAP_REQ_SEARCH;
+		o.ors_limit = NULL;
+		o.ors_tlimit = SLAP_NO_LIMIT;
+		o.ors_slimit = SLAP_NO_LIMIT;
+
+		o.ors_filterstr = *slap_filterstr_objectClass_pres;
+		o.ors_filter = (Filter *) slap_filter_objectClass_pres;
+
+		o.ors_scope = LDAP_SCOPE_BASE;
+		o.ors_deref = LDAP_DEREF_NEVER;
+		an[0].an_name = op->orc_ava->aa_desc->ad_cname;
+		an[0].an_desc = op->orc_ava->aa_desc;
+		BER_BVZERO( &an[1].an_name );
+		o.ors_attrs = an;
+		o.ors_attrsonly = 0;
+
+		o.o_acl_priv = ACL_COMPARE;
+
+		o.o_bd = be;
+		(void)be->be_search( &o, &r );
+
+		if ( o.o_dn.bv_val != op->o_dn.bv_val ) {
+			slap_op_groups_free( &o );
+		}
+	}
+
+release:;
+	if ( e != NULL ) {
+		overlay_entry_release_ov( &o, e, 0, on );
+	}
+
+	return SLAP_CB_CONTINUE;
+}
+
+static int
+dynlist_response( Operation *op, SlapReply *rs )
+{
+	switch ( op->o_tag ) {
+	case LDAP_REQ_SEARCH:
+		if ( rs->sr_type == REP_SEARCH && !get_manageDSAit( op ) )
+		{
+			int	rc = SLAP_CB_CONTINUE;
+			dynlist_info_t	*dli = NULL;
+
+			while ( (dli = dynlist_is_dynlist_next( op, rs, dli )) != NULL ) {
+				rc = dynlist_prepare_entry( op, rs, dli );
+			}
+
+			return rc;
+		}
+		break;
+
+	case LDAP_REQ_COMPARE:
+		switch ( rs->sr_err ) {
+		/* NOTE: we waste a few cycles running the dynamic list
+		 * also when the result is FALSE, which occurs if the
+		 * dynamic entry itself contains the AVA attribute  */
+		/* FIXME: this approach is less than optimal; a dedicated
+		 * compare op should be implemented, that fetches the
+		 * entry, checks if it has the appropriate objectClass
+		 * and, in case, runs a compare thru all the URIs,
+		 * stopping at the first positive occurrence; see ITS#3756 */
+		case LDAP_COMPARE_FALSE:
+		case LDAP_NO_SUCH_ATTRIBUTE:
+			return dynlist_compare( op, rs );
+		}
+		break;
+	}
+
+	return SLAP_CB_CONTINUE;
+}
+
+static int
+dynlist_build_def_filter( dynlist_info_t *dli )
+{
+	char	*ptr;
+
+	dli->dli_default_filter.bv_len = STRLENOF( "(!(objectClass=" "))" )
+		+ dli->dli_oc->soc_cname.bv_len;
+	dli->dli_default_filter.bv_val = ch_malloc( dli->dli_default_filter.bv_len + 1 );
+	if ( dli->dli_default_filter.bv_val == NULL ) {
+		Debug( LDAP_DEBUG_ANY, "dynlist_db_open: malloc failed.\n",
+			0, 0, 0 );
+		return -1;
+	}
+
+	ptr = lutil_strcopy( dli->dli_default_filter.bv_val, "(!(objectClass=" );
+	ptr = lutil_strcopy( ptr, dli->dli_oc->soc_cname.bv_val );
+	ptr = lutil_strcopy( ptr, "))" );
+
+	assert( ptr == &dli->dli_default_filter.bv_val[dli->dli_default_filter.bv_len] );
+
+	return 0;
+}
+
+enum {
+	DL_ATTRSET = 1,
+	DL_ATTRPAIR,
+	DL_ATTRPAIR_COMPAT,
+	DL_LAST
+};
+
+static ConfigDriver	dl_cfgen;
+
+/* XXXmanu 255 is the maximum arguments we allow. Can we go beyond? */
+static ConfigTable dlcfg[] = {
+	{ "dynlist-attrset", "group-oc> [uri] <URL-ad> <[mapped:]member-ad> [...]",
+		3, 0, 0, ARG_MAGIC|DL_ATTRSET, dl_cfgen,
+		"( OLcfgOvAt:8.1 NAME 'olcDlAttrSet' "
+			"DESC 'Dynamic list: <group objectClass>, <URL attributeDescription>, <member attributeDescription>' "
+			"EQUALITY caseIgnoreMatch "
+			"SYNTAX OMsDirectoryString "
+			"X-ORDERED 'VALUES' )",
+			NULL, NULL },
+	{ "dynlist-attrpair", "member-ad> <URL-ad",
+		3, 3, 0, ARG_MAGIC|DL_ATTRPAIR, dl_cfgen,
+			NULL, NULL, NULL },
+#ifdef TAKEOVER_DYNGROUP
+	{ "attrpair", "member-ad> <URL-ad",
+		3, 3, 0, ARG_MAGIC|DL_ATTRPAIR_COMPAT, dl_cfgen,
+			NULL, NULL, NULL },
+#endif
+	{ NULL, NULL, 0, 0, 0, ARG_IGNORED }
+};
+
+static ConfigOCs dlocs[] = {
+	{ "( OLcfgOvOc:8.1 "
+		"NAME 'olcDynamicList' "
+		"DESC 'Dynamic list configuration' "
+		"SUP olcOverlayConfig "
+		"MAY olcDLattrSet )",
+		Cft_Overlay, dlcfg, NULL, NULL },
+	{ NULL, 0, NULL }
+};
+
+static int
+dl_cfgen( ConfigArgs *c )
+{
+	slap_overinst	*on = (slap_overinst *)c->bi;
+	dynlist_info_t	*dli = (dynlist_info_t *)on->on_bi.bi_private;
+
+	int		rc = 0, i;
+
+	if ( c->op == SLAP_CONFIG_EMIT ) {
+		switch( c->type ) {
+		case DL_ATTRSET:
+			for ( i = 0; dli; i++, dli = dli->dli_next ) {
+				struct berval	bv;
+				char		*ptr = c->cr_msg;
+				dynlist_map_t	*dlm;
+
+				assert( dli->dli_oc != NULL );
+				assert( dli->dli_ad != NULL );
+
+				/* FIXME: check buffer overflow! */
+				ptr += snprintf( c->cr_msg, sizeof( c->cr_msg ),
+					SLAP_X_ORDERED_FMT "%s", i,
+					dli->dli_oc->soc_cname.bv_val );
+
+				if ( !BER_BVISNULL( &dli->dli_uri ) ) {
+					*ptr++ = ' ';
+					*ptr++ = '"';
+					ptr = lutil_strncopy( ptr, dli->dli_uri.bv_val,
+						dli->dli_uri.bv_len );
+					*ptr++ = '"';
+				}
+
+				*ptr++ = ' ';
+				ptr = lutil_strncopy( ptr, dli->dli_ad->ad_cname.bv_val,
+					dli->dli_ad->ad_cname.bv_len );
+
+				for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
+					ptr[ 0 ] = ' ';
+					ptr++;
+					if ( dlm->dlm_mapped_ad ) {
+						ptr = lutil_strcopy( ptr, dlm->dlm_mapped_ad->ad_cname.bv_val );
+						ptr[ 0 ] = ':';
+						ptr++;
+					}
+						
+					ptr = lutil_strcopy( ptr, dlm->dlm_member_ad->ad_cname.bv_val );
+				}
+
+				bv.bv_val = c->cr_msg;
+				bv.bv_len = ptr - bv.bv_val;
+				value_add_one( &c->rvalue_vals, &bv );
+			}
+			break;
+
+		case DL_ATTRPAIR_COMPAT:
+		case DL_ATTRPAIR:
+			rc = 1;
+			break;
+
+		default:
+			rc = 1;
+			break;
+		}
+
+		return rc;
+
+	} else if ( c->op == LDAP_MOD_DELETE ) {
+		switch( c->type ) {
+		case DL_ATTRSET:
+			if ( c->valx < 0 ) {
+				dynlist_info_t	*dli_next;
+
+				for ( dli_next = dli; dli_next; dli = dli_next ) {
+					dynlist_map_t *dlm = dli->dli_dlm;
+					dynlist_map_t *dlm_next;
+
+					dli_next = dli->dli_next;
+
+					if ( !BER_BVISNULL( &dli->dli_uri ) ) {
+						ch_free( dli->dli_uri.bv_val );
+					}
+
+					if ( dli->dli_lud != NULL ) {
+						ldap_free_urldesc( dli->dli_lud );
+					}
+
+					if ( !BER_BVISNULL( &dli->dli_uri_nbase ) ) {
+						ber_memfree( dli->dli_uri_nbase.bv_val );
+					}
+
+					if ( dli->dli_uri_filter != NULL ) {
+						filter_free( dli->dli_uri_filter );
+					}
+
+					ch_free( dli->dli_default_filter.bv_val );
+
+					while ( dlm != NULL ) {
+						dlm_next = dlm->dlm_next;
+						ch_free( dlm );
+						dlm = dlm_next;
+					}
+					ch_free( dli );
+				}
+
+				on->on_bi.bi_private = NULL;
+
+			} else {
+				dynlist_info_t	**dlip;
+				dynlist_map_t *dlm;
+				dynlist_map_t *dlm_next;
+
+				for ( i = 0, dlip = (dynlist_info_t **)&on->on_bi.bi_private;
+					i < c->valx; i++ )
+				{
+					if ( *dlip == NULL ) {
+						return 1;
+					}
+					dlip = &(*dlip)->dli_next;
+				}
+
+				dli = *dlip;
+				*dlip = dli->dli_next;
+
+				if ( !BER_BVISNULL( &dli->dli_uri ) ) {
+					ch_free( dli->dli_uri.bv_val );
+				}
+
+				if ( dli->dli_lud != NULL ) {
+					ldap_free_urldesc( dli->dli_lud );
+				}
+
+				if ( !BER_BVISNULL( &dli->dli_uri_nbase ) ) {
+					ber_memfree( dli->dli_uri_nbase.bv_val );
+				}
+
+				if ( dli->dli_uri_filter != NULL ) {
+					filter_free( dli->dli_uri_filter );
+				}
+
+				ch_free( dli->dli_default_filter.bv_val );
+
+				dlm = dli->dli_dlm;
+				while ( dlm != NULL ) {
+					dlm_next = dlm->dlm_next;
+					ch_free( dlm );
+					dlm = dlm_next;
+				}
+				ch_free( dli );
+
+				dli = (dynlist_info_t *)on->on_bi.bi_private;
+			}
+			break;
+
+		case DL_ATTRPAIR_COMPAT:
+		case DL_ATTRPAIR:
+			rc = 1;
+			break;
+
+		default:
+			rc = 1;
+			break;
+		}
+
+		return rc;
+	}
+
+	switch( c->type ) {
+	case DL_ATTRSET: {
+		dynlist_info_t		**dlip,
+					*dli_next = NULL;
+		ObjectClass		*oc = NULL;
+		AttributeDescription	*ad = NULL;
+		int			attridx = 2;
+		LDAPURLDesc		*lud = NULL;
+		struct berval		nbase = BER_BVNULL;
+		Filter			*filter = NULL;
+		struct berval		uri = BER_BVNULL;
+		dynlist_map_t           *dlm = NULL, *dlml = NULL;
+		const char		*text;
+
+		oc = oc_find( c->argv[ 1 ] );
+		if ( oc == NULL ) {
+			snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+				"unable to find ObjectClass \"%s\"",
+				c->argv[ 1 ] );
+			Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+				c->log, c->cr_msg, 0 );
+			return 1;
+		}
+
+		if ( strncasecmp( c->argv[ attridx ], "ldap://", STRLENOF("ldap://") ) == 0 ) {
+			if ( ldap_url_parse( c->argv[ attridx ], &lud ) != LDAP_URL_SUCCESS ) {
+				snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+					"unable to parse URI \"%s\"",
+					c->argv[ attridx ] );
+				rc = 1;
+				goto done_uri;
+			}
+
+			if ( lud->lud_host != NULL ) {
+				if ( lud->lud_host[0] == '\0' ) {
+					ch_free( lud->lud_host );
+					lud->lud_host = NULL;
+
+				} else {
+					snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+						"host not allowed in URI \"%s\"",
+						c->argv[ attridx ] );
+					rc = 1;
+					goto done_uri;
+				}
+			}
+
+			if ( lud->lud_attrs != NULL ) {
+				snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+					"attrs not allowed in URI \"%s\"",
+					c->argv[ attridx ] );
+				rc = 1;
+				goto done_uri;
+			}
+
+			if ( lud->lud_exts != NULL ) {
+				snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+					"extensions not allowed in URI \"%s\"",
+					c->argv[ attridx ] );
+				rc = 1;
+				goto done_uri;
+			}
+
+			if ( lud->lud_dn != NULL && lud->lud_dn[ 0 ] != '\0' ) {
+				struct berval dn;
+				ber_str2bv( lud->lud_dn, 0, 0, &dn );
+				rc = dnNormalize( 0, NULL, NULL, &dn, &nbase, NULL );
+				if ( rc != LDAP_SUCCESS ) {
+					snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+						"DN normalization failed in URI \"%s\"",
+						c->argv[ attridx ] );
+					goto done_uri;
+				}
+			}
+
+			if ( lud->lud_filter != NULL && lud->lud_filter[ 0 ] != '\0' ) {
+				filter = str2filter( lud->lud_filter );
+				if ( filter == NULL ) {
+					snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+						"filter parsing failed in URI \"%s\"",
+						c->argv[ attridx ] );
+					rc = 1;
+					goto done_uri;
+				}
+			}
+
+			ber_str2bv( c->argv[ attridx ], 0, 1, &uri );
+
+done_uri:;
+			if ( rc ) {
+				if ( lud ) {
+					ldap_free_urldesc( lud );
+				}
+
+				if ( !BER_BVISNULL( &nbase ) ) {
+					ber_memfree( nbase.bv_val );
+				}
+
+				if ( filter != NULL ) {
+					filter_free( filter );
+				}
+
+				while ( dlm != NULL ) {
+					dlml = dlm;
+					dlm = dlm->dlm_next;
+					ch_free( dlml );
+				}
+
+				Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+					c->log, c->cr_msg, 0 );
+
+				return rc;
+			}
+
+			attridx++;
+		}
+
+		rc = slap_str2ad( c->argv[ attridx ], &ad, &text );
+		if ( rc != LDAP_SUCCESS ) {
+			snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+				"unable to find AttributeDescription \"%s\"",
+				c->argv[ attridx ] );
+			Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+				c->log, c->cr_msg, 0 );
+			rc = 1;
+			goto done_uri;
+		}
+
+		if ( !is_at_subtype( ad->ad_type, slap_schema.si_ad_labeledURI->ad_type ) ) {
+			snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
+				"AttributeDescription \"%s\" "
+				"must be a subtype of \"labeledURI\"",
+				c->argv[ attridx ] );
+			Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+				c->log, c->cr_msg, 0 );
+			rc = 1;
+			goto done_uri;
+		}
+
+		attridx++;
+
+		for ( i = attridx; i < c->argc; i++ ) {
+			char *arg; 
+			char *cp;
+			AttributeDescription *member_ad = NULL;
+			AttributeDescription *mapped_ad = NULL;
+			dynlist_map_t *dlmp;
+
+
+			/*
+			 * If no mapped attribute is given, dn is used 
+			 * for backward compatibility.
+			 */
+			arg = c->argv[i];
+			if ( ( cp = strchr( arg, ':' ) ) != NULL ) {
+				struct berval bv;
+				ber_str2bv( arg, cp - arg, 0, &bv );
+				rc = slap_bv2ad( &bv, &mapped_ad, &text );
+				if ( rc != LDAP_SUCCESS ) {
+					snprintf( c->cr_msg, sizeof( c->cr_msg ),
+						DYNLIST_USAGE
+						"unable to find mapped AttributeDescription #%d \"%s\"\n",
+						i - 3, c->argv[ i ] );
+					Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+						c->log, c->cr_msg, 0 );
+					rc = 1;
+					goto done_uri;
+				}
+				arg = cp + 1;
+			}
+
+			rc = slap_str2ad( arg, &member_ad, &text );
+			if ( rc != LDAP_SUCCESS ) {
+				snprintf( c->cr_msg, sizeof( c->cr_msg ),
+					DYNLIST_USAGE
+					"unable to find AttributeDescription #%d \"%s\"\n",
+					i - 3, c->argv[ i ] );
+				Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+					c->log, c->cr_msg, 0 );
+				rc = 1;
+				goto done_uri;
+			}
+
+			dlmp = (dynlist_map_t *)ch_calloc( 1, sizeof( dynlist_map_t ) );
+			if ( dlm == NULL ) {
+				dlm = dlmp;
+			}
+			dlmp->dlm_member_ad = member_ad;
+			dlmp->dlm_mapped_ad = mapped_ad;
+			dlmp->dlm_next = NULL;
+		
+			if ( dlml != NULL ) 
+				dlml->dlm_next = dlmp;
+			dlml = dlmp;
+		}
+
+		if ( c->valx > 0 ) {
+			int	i;
+
+			for ( i = 0, dlip = (dynlist_info_t **)&on->on_bi.bi_private;
+				i < c->valx; i++ )
+			{
+				if ( *dlip == NULL ) {
+					snprintf( c->cr_msg, sizeof( c->cr_msg ),
+						DYNLIST_USAGE
+						"invalid index {%d}\n",
+						c->valx );
+					Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+						c->log, c->cr_msg, 0 );
+					rc = 1;
+					goto done_uri;
+				}
+				dlip = &(*dlip)->dli_next;
+			}
+			dli_next = *dlip;
+
+		} else {
+			for ( dlip = (dynlist_info_t **)&on->on_bi.bi_private;
+				*dlip; dlip = &(*dlip)->dli_next )
+				/* goto last */;
+		}
+
+		*dlip = (dynlist_info_t *)ch_calloc( 1, sizeof( dynlist_info_t ) );
+
+		(*dlip)->dli_oc = oc;
+		(*dlip)->dli_ad = ad;
+		(*dlip)->dli_dlm = dlm;
+		(*dlip)->dli_next = dli_next;
+
+		(*dlip)->dli_lud = lud;
+		(*dlip)->dli_uri_nbase = nbase;
+		(*dlip)->dli_uri_filter = filter;
+		(*dlip)->dli_uri = uri;
+
+		rc = dynlist_build_def_filter( *dlip );
+
+		} break;
+
+	case DL_ATTRPAIR_COMPAT:
+		snprintf( c->cr_msg, sizeof( c->cr_msg ),
+			"warning: \"attrpair\" only supported for limited "
+			"backward compatibility with overlay \"dyngroup\"" );
+		Debug( LDAP_DEBUG_ANY, "%s: %s.\n", c->log, c->cr_msg, 0 );
+		/* fallthru */
+
+	case DL_ATTRPAIR: {
+		dynlist_info_t		**dlip;
+		ObjectClass		*oc = NULL;
+		AttributeDescription	*ad = NULL,
+					*member_ad = NULL;
+		const char		*text;
+
+		oc = oc_find( "groupOfURLs" );
+		if ( oc == NULL ) {
+			snprintf( c->cr_msg, sizeof( c->cr_msg ),
+				"\"dynlist-attrpair <member-ad> <URL-ad>\": "
+				"unable to find default ObjectClass \"groupOfURLs\"" );
+			Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+				c->log, c->cr_msg, 0 );
+			return 1;
+		}
+
+		rc = slap_str2ad( c->argv[ 1 ], &member_ad, &text );
+		if ( rc != LDAP_SUCCESS ) {
+			snprintf( c->cr_msg, sizeof( c->cr_msg ),
+				"\"dynlist-attrpair <member-ad> <URL-ad>\": "
+				"unable to find AttributeDescription \"%s\"",
+				c->argv[ 1 ] );
+			Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+				c->log, c->cr_msg, 0 );
+			return 1;
+		}
+
+		rc = slap_str2ad( c->argv[ 2 ], &ad, &text );
+		if ( rc != LDAP_SUCCESS ) {
+			snprintf( c->cr_msg, sizeof( c->cr_msg ),
+				"\"dynlist-attrpair <member-ad> <URL-ad>\": "
+				"unable to find AttributeDescription \"%s\"\n",
+				c->argv[ 2 ] );
+			Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+				c->log, c->cr_msg, 0 );
+			return 1;
+		}
+
+		if ( !is_at_subtype( ad->ad_type, slap_schema.si_ad_labeledURI->ad_type ) ) {
+			snprintf( c->cr_msg, sizeof( c->cr_msg ),
+				DYNLIST_USAGE
+				"AttributeDescription \"%s\" "
+				"must be a subtype of \"labeledURI\"",
+				c->argv[ 2 ] );
+			Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+				c->log, c->cr_msg, 0 );
+			return 1;
+		}
+
+		for ( dlip = (dynlist_info_t **)&on->on_bi.bi_private;
+			*dlip; dlip = &(*dlip)->dli_next )
+		{
+			/* 
+			 * The same URL attribute / member attribute pair
+			 * cannot be repeated, but we enforce this only 
+			 * when the member attribute is unique. Performing
+			 * the check for multiple values would require
+			 * sorting and comparing the lists, which is left
+			 * as a future improvement
+			 */
+			if ( (*dlip)->dli_ad == ad &&
+			     (*dlip)->dli_dlm->dlm_next == NULL &&
+			     member_ad == (*dlip)->dli_dlm->dlm_member_ad ) {
+				snprintf( c->cr_msg, sizeof( c->cr_msg ),
+					"\"dynlist-attrpair <member-ad> <URL-ad>\": "
+					"URL attributeDescription \"%s\" already mapped.\n",
+					ad->ad_cname.bv_val );
+				Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
+					c->log, c->cr_msg, 0 );
+#if 0
+				/* make it a warning... */
+				return 1;
+#endif
+			}
+		}
+
+		*dlip = (dynlist_info_t *)ch_calloc( 1, sizeof( dynlist_info_t ) );
+
+		(*dlip)->dli_oc = oc;
+		(*dlip)->dli_ad = ad;
+		(*dlip)->dli_dlm = (dynlist_map_t *)ch_calloc( 1, sizeof( dynlist_map_t ) );
+		(*dlip)->dli_dlm->dlm_member_ad = member_ad;
+		(*dlip)->dli_dlm->dlm_mapped_ad = NULL;
+
+		rc = dynlist_build_def_filter( *dlip );
+
+		} break;
+
+	default:
+		rc = 1;
+		break;
+	}
+
+	return rc;
+}
+
+static int
+dynlist_db_open(
+	BackendDB	*be,
+	ConfigReply	*cr )
+{
+	slap_overinst		*on = (slap_overinst *) be->bd_info;
+	dynlist_info_t		*dli = (dynlist_info_t *)on->on_bi.bi_private;
+	ObjectClass		*oc = NULL;
+	AttributeDescription	*ad = NULL;
+	const char	*text;
+	int rc;
+
+	if ( dli == NULL ) {
+		dli = ch_calloc( 1, sizeof( dynlist_info_t ) );
+		on->on_bi.bi_private = (void *)dli;
+	}
+
+	for ( ; dli; dli = dli->dli_next ) {
+		if ( dli->dli_oc == NULL ) {
+			if ( oc == NULL ) {
+				oc = oc_find( "groupOfURLs" );
+				if ( oc == NULL ) {
+					snprintf( cr->msg, sizeof( cr->msg),
+						"unable to fetch objectClass \"groupOfURLs\"" );
+					Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s.\n", cr->msg, 0, 0 );
+					return 1;
+				}
+			}
+
+			dli->dli_oc = oc;
+		}
+
+		if ( dli->dli_ad == NULL ) {
+			if ( ad == NULL ) {
+				rc = slap_str2ad( "memberURL", &ad, &text );
+				if ( rc != LDAP_SUCCESS ) {
+					snprintf( cr->msg, sizeof( cr->msg),
+						"unable to fetch attributeDescription \"memberURL\": %d (%s)",
+						rc, text );
+					Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s.\n", cr->msg, 0, 0 );
+					return 1;
+				}
+			}
+		
+			dli->dli_ad = ad;			
+		}
+
+		if ( BER_BVISNULL( &dli->dli_default_filter ) ) {
+			rc = dynlist_build_def_filter( dli );
+			if ( rc != 0 ) {
+				return rc;
+			}
+		}
+	}
+
+	if ( ad_dgIdentity == NULL ) {
+		rc = slap_str2ad( "dgIdentity", &ad_dgIdentity, &text );
+		if ( rc != LDAP_SUCCESS ) {
+			snprintf( cr->msg, sizeof( cr->msg),
+				"unable to fetch attributeDescription \"dgIdentity\": %d (%s)",
+				rc, text );
+			Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s\n", cr->msg, 0, 0 );
+			/* Just a warning */
+		}
+	}
+
+	if ( ad_dgAuthz == NULL ) {
+		rc = slap_str2ad( "dgAuthz", &ad_dgAuthz, &text );
+		if ( rc != LDAP_SUCCESS ) {
+			snprintf( cr->msg, sizeof( cr->msg),
+				"unable to fetch attributeDescription \"dgAuthz\": %d (%s)",
+				rc, text );
+			Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s\n", cr->msg, 0, 0 );
+			/* Just a warning */
+		}
+	}
+
+	return 0;
+}
+
+static int
+dynlist_db_destroy(
+	BackendDB	*be,
+	ConfigReply	*cr )
+{
+	slap_overinst	*on = (slap_overinst *) be->bd_info;
+
+	if ( on->on_bi.bi_private ) {
+		dynlist_info_t	*dli = (dynlist_info_t *)on->on_bi.bi_private,
+				*dli_next;
+
+		for ( dli_next = dli; dli_next; dli = dli_next ) {
+			dynlist_map_t *dlm;
+			dynlist_map_t *dlm_next;
+
+			dli_next = dli->dli_next;
+
+			if ( !BER_BVISNULL( &dli->dli_uri ) ) {
+				ch_free( dli->dli_uri.bv_val );
+			}
+
+			if ( dli->dli_lud != NULL ) {
+				ldap_free_urldesc( dli->dli_lud );
+			}
+
+			if ( !BER_BVISNULL( &dli->dli_uri_nbase ) ) {
+				ber_memfree( dli->dli_uri_nbase.bv_val );
+			}
+
+			if ( dli->dli_uri_filter != NULL ) {
+				filter_free( dli->dli_uri_filter );
+			}
+
+			ch_free( dli->dli_default_filter.bv_val );
+
+			dlm = dli->dli_dlm;
+			while ( dlm != NULL ) {
+				dlm_next = dlm->dlm_next;
+				ch_free( dlm );
+				dlm = dlm_next;
+			}
+			ch_free( dli );
+		}
+	}
+
+	return 0;
+}
+
+static slap_overinst	dynlist = { { NULL } };
+#ifdef TAKEOVER_DYNGROUP
+static char		*obsolete_names[] = {
+	"dyngroup",
+	NULL
+};
+#endif
+
+#if SLAPD_OVER_DYNLIST == SLAPD_MOD_DYNAMIC
+static
+#endif /* SLAPD_OVER_DYNLIST == SLAPD_MOD_DYNAMIC */
+int
+dynlist_initialize(void)
+{
+	int	rc = 0;
+
+	dynlist.on_bi.bi_type = "dynlist";
+
+#ifdef TAKEOVER_DYNGROUP
+	/* makes dynlist incompatible with dyngroup */
+	dynlist.on_bi.bi_obsolete_names = obsolete_names;
+#endif
+
+	dynlist.on_bi.bi_db_config = config_generic_wrapper;
+	dynlist.on_bi.bi_db_open = dynlist_db_open;
+	dynlist.on_bi.bi_db_destroy = dynlist_db_destroy;
+
+	dynlist.on_response = dynlist_response;
+
+	dynlist.on_bi.bi_cf_ocs = dlocs;
+
+	rc = config_register_schema( dlcfg, dlocs );
+	if ( rc ) {
+		return rc;
+	}
+
+	return overlay_register( &dynlist );
+}
+
+#if SLAPD_OVER_DYNLIST == SLAPD_MOD_DYNAMIC
+int
+init_module( int argc, char *argv[] )
+{
+	return dynlist_initialize();
+}
+#endif
+
+#endif /* SLAPD_OVER_DYNLIST */