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, 2462 insertions, 0 deletions

diff --git a/servers/slapd/back-meta/search.c b/servers/slapd/back-meta/search.c
new file mode 100644
index 0000000..f8c519a
--- /dev/null
+++ b/servers/slapd/back-meta/search.c
@@ -0,0 +1,2462 @@
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1999-2018 The OpenLDAP Foundation.
+ * Portions Copyright 2001-2003 Pierangelo Masarati.
+ * Portions Copyright 1999-2003 Howard Chu.
+ * 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 the Howard Chu for inclusion
+ * in OpenLDAP Software and subsequently enhanced by Pierangelo
+ * Masarati.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/time.h>
+
+#include "lutil.h"
+#include "slap.h"
+#include "../back-ldap/back-ldap.h"
+#include "back-meta.h"
+#include "../../../libraries/liblber/lber-int.h"
+
+/* IGNORE means that target does not (no longer) participate
+ * in the search;
+ * NOTREADY means the search on that target has not been initialized yet
+ */
+#define	META_MSGID_IGNORE	(-1)
+#define	META_MSGID_NEED_BIND	(-2)
+#define	META_MSGID_CONNECTING	(-3)
+
+static int
+meta_send_entry(
+	Operation 	*op,
+	SlapReply	*rs,
+	metaconn_t	*mc,
+	int 		i,
+	LDAPMessage 	*e );
+
+typedef enum meta_search_candidate_t {
+	META_SEARCH_UNDEFINED = -2,
+	META_SEARCH_ERR = -1,
+	META_SEARCH_NOT_CANDIDATE,
+	META_SEARCH_CANDIDATE,
+	META_SEARCH_BINDING,
+	META_SEARCH_NEED_BIND,
+	META_SEARCH_CONNECTING
+} meta_search_candidate_t;
+
+/*
+ * meta_search_dobind_init()
+ *
+ * initiates bind for a candidate target of a search.
+ */
+static meta_search_candidate_t
+meta_search_dobind_init(
+	Operation		*op,
+	SlapReply		*rs,
+	metaconn_t		**mcp,
+	int			candidate,
+	SlapReply		*candidates )
+{
+	metaconn_t		*mc = *mcp;
+	metainfo_t		*mi = ( metainfo_t * )op->o_bd->be_private;
+	metatarget_t		*mt = mi->mi_targets[ candidate ];
+	metasingleconn_t	*msc = &mc->mc_conns[ candidate ];
+
+	struct berval		binddn = msc->msc_bound_ndn,
+				cred = msc->msc_cred;
+	int			method;
+
+	int			rc;
+
+	meta_search_candidate_t	retcode;
+
+	Debug( LDAP_DEBUG_TRACE, "%s >>> meta_search_dobind_init[%d]\n",
+		op->o_log_prefix, candidate, 0 );
+
+	/*
+	 * all the targets are already bound as pseudoroot
+	 */
+	if ( mc->mc_authz_target == META_BOUND_ALL ) {
+		return META_SEARCH_CANDIDATE;
+	}
+
+	retcode = META_SEARCH_BINDING;
+	ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+	if ( LDAP_BACK_CONN_ISBOUND( msc ) || LDAP_BACK_CONN_ISANON( msc ) ) {
+		/* already bound (or anonymous) */
+
+#ifdef DEBUG_205
+		char	buf[ SLAP_TEXT_BUFLEN ] = { '\0' };
+		int	bound = 0;
+
+		if ( LDAP_BACK_CONN_ISBOUND( msc ) ) {
+			bound = 1;
+		}
+
+		snprintf( buf, sizeof( buf ), " mc=%p ld=%p%s DN=\"%s\"",
+			(void *)mc, (void *)msc->msc_ld,
+			bound ? " bound" : " anonymous",
+			bound == 0 ? "" : msc->msc_bound_ndn.bv_val );
+		Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
+			op->o_log_prefix, candidate, buf );
+#endif /* DEBUG_205 */
+
+		retcode = META_SEARCH_CANDIDATE;
+
+	} else if ( META_BACK_CONN_CREATING( msc ) || LDAP_BACK_CONN_BINDING( msc ) ) {
+		/* another thread is binding the target for this conn; wait */
+
+#ifdef DEBUG_205
+		char	buf[ SLAP_TEXT_BUFLEN ] = { '\0' };
+
+		snprintf( buf, sizeof( buf ), " mc=%p ld=%p needbind",
+			(void *)mc, (void *)msc->msc_ld );
+		Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
+			op->o_log_prefix, candidate, buf );
+#endif /* DEBUG_205 */
+
+		candidates[ candidate ].sr_msgid = META_MSGID_NEED_BIND;
+		retcode = META_SEARCH_NEED_BIND;
+
+	} else {
+		/* we'll need to bind the target for this conn */
+
+#ifdef DEBUG_205
+		char buf[ SLAP_TEXT_BUFLEN ];
+
+		snprintf( buf, sizeof( buf ), " mc=%p ld=%p binding",
+			(void *)mc, (void *)msc->msc_ld );
+		Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
+			op->o_log_prefix, candidate, buf );
+#endif /* DEBUG_205 */
+
+		if ( msc->msc_ld == NULL ) {
+			/* for some reason (e.g. because formerly in "binding"
+			 * state, with eventual connection expiration or invalidation)
+			 * it was not initialized as expected */
+
+			Debug( LDAP_DEBUG_ANY, "%s meta_search_dobind_init[%d] mc=%p ld=NULL\n",
+				op->o_log_prefix, candidate, (void *)mc );
+
+			rc = meta_back_init_one_conn( op, rs, *mcp, candidate,
+				LDAP_BACK_CONN_ISPRIV( *mcp ), LDAP_BACK_DONTSEND, 0 );
+			switch ( rc ) {
+			case LDAP_SUCCESS:
+				assert( msc->msc_ld != NULL );
+				break;
+
+			case LDAP_SERVER_DOWN:
+			case LDAP_UNAVAILABLE:
+				ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+				goto down;
+	
+			default:
+				ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+				goto other;
+			}
+		}
+
+		LDAP_BACK_CONN_BINDING_SET( msc );
+	}
+
+	ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+
+	if ( retcode != META_SEARCH_BINDING ) {
+		return retcode;
+	}
+
+	/* NOTE: this obsoletes pseudorootdn */
+	if ( op->o_conn != NULL &&
+		!op->o_do_not_cache &&
+		( BER_BVISNULL( &msc->msc_bound_ndn ) ||
+			BER_BVISEMPTY( &msc->msc_bound_ndn ) ||
+			( mt->mt_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
+	{
+		rc = meta_back_proxy_authz_cred( mc, candidate, op, rs, LDAP_BACK_DONTSEND, &binddn, &cred, &method );
+		switch ( rc ) {
+		case LDAP_SUCCESS:
+			break;
+		case LDAP_UNAVAILABLE:
+			goto down;
+		default:
+			goto other;
+		}
+
+		/* NOTE: we copy things here, even if bind didn't succeed yet,
+		 * because the connection is not shared until bind is over */
+		if ( !BER_BVISNULL( &binddn ) ) {
+			ber_bvreplace( &msc->msc_bound_ndn, &binddn );
+			if ( META_BACK_TGT_SAVECRED( mt ) && !BER_BVISNULL( &cred ) ) {
+				if ( !BER_BVISNULL( &msc->msc_cred ) ) {
+					memset( msc->msc_cred.bv_val, 0,
+						msc->msc_cred.bv_len );
+				}
+				ber_bvreplace( &msc->msc_cred, &cred );
+			}
+		}
+
+		if ( LDAP_BACK_CONN_ISBOUND( msc ) ) {
+			/* apparently, idassert was configured with SASL bind,
+			 * so bind occurred inside meta_back_proxy_authz_cred() */
+			ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+			LDAP_BACK_CONN_BINDING_CLEAR( msc );
+			ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+			return META_SEARCH_CANDIDATE;
+		}
+
+		/* paranoid */
+		switch ( method ) {
+		case LDAP_AUTH_NONE:
+		case LDAP_AUTH_SIMPLE:
+			/* do a simple bind with binddn, cred */
+			break;
+
+		default:
+			assert( 0 );
+			break;
+		}
+	}
+
+	assert( msc->msc_ld != NULL );
+
+	/* connect must be async only the first time... */
+	ldap_set_option( msc->msc_ld, LDAP_OPT_CONNECT_ASYNC, LDAP_OPT_ON );
+
+retry:;
+	if ( !BER_BVISEMPTY( &binddn ) && BER_BVISEMPTY( &cred ) ) {
+		/* bind anonymously? */
+		Debug( LDAP_DEBUG_ANY, "%s meta_search_dobind_init[%d] mc=%p: "
+			"non-empty dn with empty cred; binding anonymously\n",
+			op->o_log_prefix, candidate, (void *)mc );
+		cred = slap_empty_bv;
+		
+	} else if ( BER_BVISEMPTY( &binddn ) && !BER_BVISEMPTY( &cred ) ) {
+		/* error */
+		Debug( LDAP_DEBUG_ANY, "%s meta_search_dobind_init[%d] mc=%p: "
+			"empty dn with non-empty cred: error\n",
+			op->o_log_prefix, candidate, (void *)mc );
+		rc = LDAP_OTHER;
+		goto other;
+	}
+
+	rc = ldap_sasl_bind( msc->msc_ld, binddn.bv_val, LDAP_SASL_SIMPLE, &cred,
+			NULL, NULL, &candidates[ candidate ].sr_msgid );
+
+#ifdef DEBUG_205
+	{
+		char buf[ SLAP_TEXT_BUFLEN ];
+
+		snprintf( buf, sizeof( buf ), "meta_search_dobind_init[%d] mc=%p ld=%p rc=%d",
+			candidate, (void *)mc, (void *)mc->mc_conns[ candidate ].msc_ld, rc );
+		Debug( LDAP_DEBUG_ANY, "### %s %s\n",
+			op->o_log_prefix, buf, 0 );
+	}
+#endif /* DEBUG_205 */
+
+	switch ( rc ) {
+	case LDAP_SUCCESS:
+		assert( candidates[ candidate ].sr_msgid >= 0 );
+		META_BINDING_SET( &candidates[ candidate ] );
+		return META_SEARCH_BINDING;
+
+	case LDAP_X_CONNECTING:
+		/* must retry, same conn */
+		candidates[ candidate ].sr_msgid = META_MSGID_CONNECTING;
+		ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+		LDAP_BACK_CONN_BINDING_CLEAR( msc );
+		ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+		return META_SEARCH_CONNECTING;
+
+	case LDAP_SERVER_DOWN:
+down:;
+		/* This is the worst thing that could happen:
+		 * the search will wait until the retry is over. */
+		if ( !META_IS_RETRYING( &candidates[ candidate ] ) ) {
+			META_RETRYING_SET( &candidates[ candidate ] );
+
+			ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+
+			assert( mc->mc_refcnt > 0 );
+			if ( LogTest( LDAP_DEBUG_ANY ) ) {
+				char	buf[ SLAP_TEXT_BUFLEN ];
+
+				/* this lock is required; however,
+				 * it's invoked only when logging is on */
+				ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
+				snprintf( buf, sizeof( buf ),
+					"retrying URI=\"%s\" DN=\"%s\"",
+					mt->mt_uri,
+					BER_BVISNULL( &msc->msc_bound_ndn ) ?
+						"" : msc->msc_bound_ndn.bv_val );
+				ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
+
+				Debug( LDAP_DEBUG_ANY,
+					"%s meta_search_dobind_init[%d]: %s.\n",
+					op->o_log_prefix, candidate, buf );
+			}
+
+			meta_clear_one_candidate( op, mc, candidate );
+			LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
+
+			( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
+
+			/* mc here must be the regular mc, reset and ready for init */
+			rc = meta_back_init_one_conn( op, rs, mc, candidate,
+				LDAP_BACK_CONN_ISPRIV( mc ), LDAP_BACK_DONTSEND, 0 );
+
+			if ( rc == LDAP_SUCCESS ) {
+				LDAP_BACK_CONN_BINDING_SET( msc );
+			}
+
+			ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+
+			if ( rc == LDAP_SUCCESS ) {
+				candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+				binddn = msc->msc_bound_ndn;
+				cred = msc->msc_cred;
+				goto retry;
+			}
+		}
+
+		if ( *mcp == NULL ) {
+			retcode = META_SEARCH_ERR;
+			rc = LDAP_UNAVAILABLE;
+			candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+			break;
+		}
+		/* fall thru */
+
+	default:
+other:;
+		rs->sr_err = rc;
+		rc = slap_map_api2result( rs );
+
+		ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+		meta_clear_one_candidate( op, mc, candidate );
+		candidates[ candidate ].sr_err = rc;
+		if ( META_BACK_ONERR_STOP( mi ) ) {
+			LDAP_BACK_CONN_TAINTED_SET( mc );
+			meta_back_release_conn_lock( mi, mc, 0 );
+			*mcp = NULL;
+
+			retcode = META_SEARCH_ERR;
+
+		} else {
+			retcode = META_SEARCH_NOT_CANDIDATE;
+		}
+		candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+		ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+		break;
+	}
+
+	return retcode;
+}
+
+static meta_search_candidate_t
+meta_search_dobind_result(
+	Operation		*op,
+	SlapReply		*rs,
+	metaconn_t		**mcp,
+	int			candidate,
+	SlapReply		*candidates,
+	LDAPMessage		*res )
+{
+	metainfo_t		*mi = ( metainfo_t * )op->o_bd->be_private;
+	metatarget_t		*mt = mi->mi_targets[ candidate ];
+	metaconn_t		*mc = *mcp;
+	metasingleconn_t	*msc = &mc->mc_conns[ candidate ];
+
+	meta_search_candidate_t	retcode = META_SEARCH_NOT_CANDIDATE;
+	int			rc;
+
+	assert( msc->msc_ld != NULL );
+
+	/* FIXME: matched? referrals? response controls? */
+	rc = ldap_parse_result( msc->msc_ld, res,
+		&candidates[ candidate ].sr_err,
+		NULL, NULL, NULL, NULL, 0 );
+	if ( rc != LDAP_SUCCESS ) {
+		candidates[ candidate ].sr_err = rc;
+	}
+	rc = slap_map_api2result( &candidates[ candidate ] );
+
+	ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+	LDAP_BACK_CONN_BINDING_CLEAR( msc );
+	if ( rc != LDAP_SUCCESS ) {
+		meta_clear_one_candidate( op, mc, candidate );
+		candidates[ candidate ].sr_err = rc;
+		if ( META_BACK_ONERR_STOP( mi ) ) {
+	        	LDAP_BACK_CONN_TAINTED_SET( mc );
+			meta_back_release_conn_lock( mi, mc, 0 );
+			*mcp = NULL;
+			retcode = META_SEARCH_ERR;
+			rs->sr_err = rc;
+		}
+
+	} else {
+		/* FIXME: check if bound as idassert authcDN! */
+		if ( BER_BVISNULL( &msc->msc_bound_ndn )
+			|| BER_BVISEMPTY( &msc->msc_bound_ndn ) )
+		{
+			LDAP_BACK_CONN_ISANON_SET( msc );
+
+		} else {
+			if ( META_BACK_TGT_SAVECRED( mt ) &&
+				!BER_BVISNULL( &msc->msc_cred ) &&
+				!BER_BVISEMPTY( &msc->msc_cred ) )
+			{
+				ldap_set_rebind_proc( msc->msc_ld, mt->mt_rebind_f, msc );
+			}
+			LDAP_BACK_CONN_ISBOUND_SET( msc );
+		}
+		retcode = META_SEARCH_CANDIDATE;
+
+		/* connect must be async */
+		ldap_set_option( msc->msc_ld, LDAP_OPT_CONNECT_ASYNC, LDAP_OPT_OFF );
+	}
+
+	candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+	META_BINDING_CLEAR( &candidates[ candidate ] );
+
+	ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+
+	return retcode;
+}
+
+static meta_search_candidate_t
+meta_back_search_start(
+	Operation		*op,
+	SlapReply		*rs,
+	dncookie		*dc,
+	metaconn_t		**mcp,
+	int			candidate,
+	SlapReply		*candidates,
+	struct berval		*prcookie,
+	ber_int_t		prsize )
+{
+	metainfo_t		*mi = ( metainfo_t * )op->o_bd->be_private;
+	metatarget_t		*mt = mi->mi_targets[ candidate ];
+	metasingleconn_t	*msc = &(*mcp)->mc_conns[ candidate ];
+	struct berval		realbase = op->o_req_dn;
+	int			realscope = op->ors_scope;
+	struct berval		mbase = BER_BVNULL; 
+	struct berval		mfilter = BER_BVNULL;
+	char			**mapped_attrs = NULL;
+	int			rc;
+	meta_search_candidate_t	retcode;
+	struct timeval		tv, *tvp = NULL;
+	int			nretries = 1;
+	LDAPControl		**ctrls = NULL;
+#ifdef SLAPD_META_CLIENT_PR
+	LDAPControl		**save_ctrls = NULL;
+#endif /* SLAPD_META_CLIENT_PR */
+
+	/* this should not happen; just in case... */
+	if ( msc->msc_ld == NULL ) {
+		Debug( LDAP_DEBUG_ANY,
+			"%s: meta_back_search_start candidate=%d ld=NULL%s.\n",
+			op->o_log_prefix, candidate,
+			META_BACK_ONERR_STOP( mi ) ? "" : " (ignored)" );
+		candidates[ candidate ].sr_err = LDAP_OTHER;
+		if ( META_BACK_ONERR_STOP( mi ) ) {
+			return META_SEARCH_ERR;
+		}
+		candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+		return META_SEARCH_NOT_CANDIDATE;
+	}
+
+	Debug( LDAP_DEBUG_TRACE, "%s >>> meta_back_search_start[%d]\n", op->o_log_prefix, candidate, 0 );
+
+	/*
+	 * modifies the base according to the scope, if required
+	 */
+	if ( mt->mt_nsuffix.bv_len > op->o_req_ndn.bv_len ) {
+		switch ( op->ors_scope ) {
+		case LDAP_SCOPE_SUBTREE:
+			/*
+			 * make the target suffix the new base
+			 * FIXME: this is very forgiving, because
+			 * "illegal" searchBases may be turned
+			 * into the suffix of the target; however,
+			 * the requested searchBase already passed
+			 * thru the candidate analyzer...
+			 */
+			if ( dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) ) {
+				realbase = mt->mt_nsuffix;
+				if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
+					realscope = LDAP_SCOPE_SUBORDINATE;
+				}
+
+			} else {
+				/*
+				 * this target is no longer candidate
+				 */
+				retcode = META_SEARCH_NOT_CANDIDATE;
+				goto doreturn;
+			}
+			break;
+
+		case LDAP_SCOPE_SUBORDINATE:
+		case LDAP_SCOPE_ONELEVEL:
+		{
+			struct berval	rdn = mt->mt_nsuffix;
+			rdn.bv_len -= op->o_req_ndn.bv_len + STRLENOF( "," );
+			if ( dnIsOneLevelRDN( &rdn )
+					&& dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) )
+			{
+				/*
+				 * if there is exactly one level,
+				 * make the target suffix the new
+				 * base, and make scope "base"
+				 */
+				realbase = mt->mt_nsuffix;
+				if ( op->ors_scope == LDAP_SCOPE_SUBORDINATE ) {
+					if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
+						realscope = LDAP_SCOPE_SUBORDINATE;
+					} else {
+						realscope = LDAP_SCOPE_SUBTREE;
+					}
+				} else {
+					realscope = LDAP_SCOPE_BASE;
+				}
+				break;
+			} /* else continue with the next case */
+		}
+
+		case LDAP_SCOPE_BASE:
+			/*
+			 * this target is no longer candidate
+			 */
+			retcode = META_SEARCH_NOT_CANDIDATE;
+			goto doreturn;
+		}
+	}
+
+	/* check filter expression */
+	if ( mt->mt_filter ) {
+		metafilter_t *mf;
+		for ( mf = mt->mt_filter; mf; mf = mf->mf_next ) {
+			if ( regexec( &mf->mf_regex, op->ors_filterstr.bv_val, 0, NULL, 0 ) == 0 )
+				break;
+		}
+		/* nothing matched, this target is no longer a candidate */
+		if ( !mf ) {
+			retcode = META_SEARCH_NOT_CANDIDATE;
+			goto doreturn;
+		}
+	}
+
+	/* initiate dobind */
+	retcode = meta_search_dobind_init( op, rs, mcp, candidate, candidates );
+
+	Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%d]=%d\n", op->o_log_prefix, candidate, retcode );
+
+	if ( retcode != META_SEARCH_CANDIDATE ) {
+		goto doreturn;
+	}
+
+	/*
+	 * Rewrite the search base, if required
+	 */
+	dc->target = mt;
+	dc->ctx = "searchBase";
+	switch ( ldap_back_dn_massage( dc, &realbase, &mbase ) ) {
+	case LDAP_SUCCESS:
+		break;
+
+	case LDAP_UNWILLING_TO_PERFORM:
+		rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+		rs->sr_text = "Operation not allowed";
+		send_ldap_result( op, rs );
+		retcode = META_SEARCH_ERR;
+		goto doreturn;
+
+	default:
+
+		/*
+		 * this target is no longer candidate
+		 */
+		retcode = META_SEARCH_NOT_CANDIDATE;
+		goto doreturn;
+	}
+
+	/*
+	 * Maps filter
+	 */
+	rc = ldap_back_filter_map_rewrite( dc, op->ors_filter,
+			&mfilter, BACKLDAP_MAP, op->o_tmpmemctx );
+	switch ( rc ) {
+	case LDAP_SUCCESS:
+		break;
+
+	case LDAP_COMPARE_FALSE:
+	default:
+		/*
+		 * this target is no longer candidate
+		 */
+		retcode = META_SEARCH_NOT_CANDIDATE;
+		goto done;
+	}
+
+	/*
+	 * Maps required attributes
+	 */
+	rc = ldap_back_map_attrs( op, &mt->mt_rwmap.rwm_at,
+			op->ors_attrs, BACKLDAP_MAP, &mapped_attrs );
+	if ( rc != LDAP_SUCCESS ) {
+		/*
+		 * this target is no longer candidate
+		 */
+		retcode = META_SEARCH_NOT_CANDIDATE;
+		goto done;
+	}
+
+	if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
+		tv.tv_sec = op->ors_tlimit > 0 ? op->ors_tlimit : 1;
+		tv.tv_usec = 0;
+		tvp = &tv;
+	}
+
+#ifdef SLAPD_META_CLIENT_PR
+	save_ctrls = op->o_ctrls;
+	{
+		LDAPControl *pr_c = NULL;
+		int i = 0, nc = 0;
+
+		if ( save_ctrls ) {
+			for ( ; save_ctrls[i] != NULL; i++ );
+			nc = i;
+			pr_c = ldap_control_find( LDAP_CONTROL_PAGEDRESULTS, save_ctrls, NULL );
+		}
+
+		if ( pr_c != NULL ) nc--;
+		if ( mt->mt_ps > 0 || prcookie != NULL ) nc++;
+
+		if ( mt->mt_ps > 0 || prcookie != NULL || pr_c != NULL ) {
+			int src = 0, dst = 0;
+			BerElementBuffer berbuf;
+			BerElement *ber = (BerElement *)&berbuf;
+			struct berval val = BER_BVNULL;
+			ber_len_t len;
+
+			len = sizeof( LDAPControl * )*( nc + 1 ) + sizeof( LDAPControl );
+
+			if ( mt->mt_ps > 0 || prcookie != NULL ) {
+				struct berval nullcookie = BER_BVNULL;
+				ber_tag_t tag;
+
+				if ( prsize == 0 && mt->mt_ps > 0 ) prsize = mt->mt_ps;
+				if ( prcookie == NULL ) prcookie = &nullcookie;
+
+				ber_init2( ber, NULL, LBER_USE_DER );
+				tag = ber_printf( ber, "{iO}", prsize, prcookie ); 
+				if ( tag == LBER_ERROR ) {
+					/* error */
+					(void) ber_free_buf( ber );
+					goto done_pr;
+				}
+
+				tag = ber_flatten2( ber, &val, 0 );
+				if ( tag == LBER_ERROR ) {
+					/* error */
+					(void) ber_free_buf( ber );
+					goto done_pr;
+				}
+
+				len += val.bv_len + 1;
+			}
+
+			op->o_ctrls = op->o_tmpalloc( len, op->o_tmpmemctx );
+			if ( save_ctrls ) {
+				for ( ; save_ctrls[ src ] != NULL; src++ ) {
+					if ( save_ctrls[ src ] != pr_c ) {
+						op->o_ctrls[ dst ] = save_ctrls[ src ];
+						dst++;
+					}
+				}
+			}
+
+			if ( mt->mt_ps > 0 || prcookie != NULL ) {
+				op->o_ctrls[ dst ] = (LDAPControl *)&op->o_ctrls[ nc + 1 ];
+
+				op->o_ctrls[ dst ]->ldctl_oid = LDAP_CONTROL_PAGEDRESULTS;
+				op->o_ctrls[ dst ]->ldctl_iscritical = 1;
+
+				op->o_ctrls[ dst ]->ldctl_value.bv_val = (char *)&op->o_ctrls[ dst ][ 1 ];
+				AC_MEMCPY( op->o_ctrls[ dst ]->ldctl_value.bv_val, val.bv_val, val.bv_len + 1 );
+				op->o_ctrls[ dst ]->ldctl_value.bv_len = val.bv_len;
+				dst++;
+
+				(void)ber_free_buf( ber );
+			}
+
+			op->o_ctrls[ dst ] = NULL;
+		}
+done_pr:;
+	}
+#endif /* SLAPD_META_CLIENT_PR */
+
+retry:;
+	ctrls = op->o_ctrls;
+	if ( meta_back_controls_add( op, rs, *mcp, candidate, &ctrls )
+		!= LDAP_SUCCESS )
+	{
+		candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+		retcode = META_SEARCH_NOT_CANDIDATE;
+		goto done;
+	}
+
+	/*
+	 * Starts the search
+	 */
+	assert( msc->msc_ld != NULL );
+	rc = ldap_pvt_search( msc->msc_ld,
+			mbase.bv_val, realscope, mfilter.bv_val,
+			mapped_attrs, op->ors_attrsonly,
+			ctrls, NULL, tvp, op->ors_slimit, op->ors_deref,
+			&candidates[ candidate ].sr_msgid ); 
+	switch ( rc ) {
+	case LDAP_SUCCESS:
+		retcode = META_SEARCH_CANDIDATE;
+		break;
+	
+	case LDAP_SERVER_DOWN:
+		if ( nretries && meta_back_retry( op, rs, mcp, candidate, LDAP_BACK_DONTSEND ) ) {
+			nretries = 0;
+			/* if the identity changed, there might be need to re-authz */
+			(void)mi->mi_ldap_extra->controls_free( op, rs, &ctrls );
+			goto retry;
+		}
+
+		if ( *mcp == NULL ) {
+			retcode = META_SEARCH_ERR;
+			candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+			break;
+		}
+		/* fall thru */
+
+	default:
+		candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+		retcode = META_SEARCH_NOT_CANDIDATE;
+	}
+
+done:;
+	(void)mi->mi_ldap_extra->controls_free( op, rs, &ctrls );
+#ifdef SLAPD_META_CLIENT_PR
+	if ( save_ctrls != op->o_ctrls ) {
+		op->o_tmpfree( op->o_ctrls, op->o_tmpmemctx );
+		op->o_ctrls = save_ctrls;
+	}
+#endif /* SLAPD_META_CLIENT_PR */
+
+	if ( mapped_attrs ) {
+		ber_memfree_x( mapped_attrs, op->o_tmpmemctx );
+	}
+	if ( mfilter.bv_val != op->ors_filterstr.bv_val ) {
+		ber_memfree_x( mfilter.bv_val, op->o_tmpmemctx );
+	}
+	if ( mbase.bv_val != realbase.bv_val ) {
+		free( mbase.bv_val );
+	}
+
+doreturn:;
+	Debug( LDAP_DEBUG_TRACE, "%s <<< meta_back_search_start[%d]=%d\n", op->o_log_prefix, candidate, retcode );
+
+	return retcode;
+}
+
+int
+meta_back_search( Operation *op, SlapReply *rs )
+{
+	metainfo_t	*mi = ( metainfo_t * )op->o_bd->be_private;
+	metaconn_t	*mc;
+	struct timeval	save_tv = { 0, 0 },
+			tv;
+	time_t		stoptime = (time_t)(-1),
+			lastres_time = slap_get_time(),
+			timeout = 0;
+	int		rc = 0, sres = LDAP_SUCCESS;
+	char		*matched = NULL;
+	int		last = 0, ncandidates = 0,
+			initial_candidates = 0, candidate_match = 0,
+			needbind = 0;
+	ldap_back_send_t	sendok = LDAP_BACK_SENDERR;
+	long		i;
+	dncookie	dc;
+	int		is_ok = 0;
+	void		*savepriv;
+	SlapReply	*candidates = NULL;
+	int		do_taint = 0;
+
+	rs_assert_ready( rs );
+	rs->sr_flags &= ~REP_ENTRY_MASK; /* paranoia, we can set rs = non-entry */
+
+	/*
+	 * controls are set in ldap_back_dobind()
+	 * 
+	 * FIXME: in case of values return filter, we might want
+	 * to map attrs and maybe rewrite value
+	 */
+getconn:;
+	mc = meta_back_getconn( op, rs, NULL, sendok );
+	if ( !mc ) {
+		return rs->sr_err;
+	}
+
+	dc.conn = op->o_conn;
+	dc.rs = rs;
+
+	if ( candidates == NULL ) candidates = meta_back_candidates_get( op );
+	/*
+	 * Inits searches
+	 */
+	for ( i = 0; i < mi->mi_ntargets; i++ ) {
+		/* reset sr_msgid; it is used in most loops
+		 * to check if that target is still to be considered */
+		candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+
+		/* a target is marked as candidate by meta_back_getconn();
+		 * if for any reason (an error, it's over or so) it is
+		 * no longer active, sr_msgid is set to META_MSGID_IGNORE
+		 * but it remains candidate, which means it has been active
+		 * at some point during the operation.  This allows to 
+		 * use its response code and more to compute the final
+		 * response */
+		if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
+			continue;
+		}
+
+		candidates[ i ].sr_matched = NULL;
+		candidates[ i ].sr_text = NULL;
+		candidates[ i ].sr_ref = NULL;
+		candidates[ i ].sr_ctrls = NULL;
+		candidates[ i ].sr_nentries = 0;
+
+		/* get largest timeout among candidates */
+		if ( mi->mi_targets[ i ]->mt_timeout[ SLAP_OP_SEARCH ]
+			&& mi->mi_targets[ i ]->mt_timeout[ SLAP_OP_SEARCH ] > timeout )
+		{
+			timeout = mi->mi_targets[ i ]->mt_timeout[ SLAP_OP_SEARCH ];
+		}
+	}
+
+	for ( i = 0; i < mi->mi_ntargets; i++ ) {
+		if ( !META_IS_CANDIDATE( &candidates[ i ] )
+			|| candidates[ i ].sr_err != LDAP_SUCCESS )
+		{
+			continue;
+		}
+
+		switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates, NULL, 0 ) )
+		{
+		case META_SEARCH_NOT_CANDIDATE:
+			candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+			break;
+
+		case META_SEARCH_NEED_BIND:
+			++needbind;
+			/* fallthru */
+
+		case META_SEARCH_CONNECTING:
+		case META_SEARCH_CANDIDATE:
+		case META_SEARCH_BINDING:
+			candidates[ i ].sr_type = REP_INTERMEDIATE;
+			++ncandidates;
+			break;
+
+		case META_SEARCH_ERR:
+			savepriv = op->o_private;
+			op->o_private = (void *)i;
+			send_ldap_result( op, rs );
+			op->o_private = savepriv;
+			rc = -1;
+			goto finish;
+
+		default:
+			assert( 0 );
+			break;
+		}
+	}
+
+	if ( ncandidates > 0 && needbind == ncandidates ) {
+		/*
+		 * give up the second time...
+		 *
+		 * NOTE: this should not occur the second time, since a fresh
+		 * connection has ben created; however, targets may also
+		 * need bind because the bind timed out or so.
+		 */
+		if ( sendok & LDAP_BACK_BINDING ) {
+			Debug( LDAP_DEBUG_ANY,
+				"%s meta_back_search: unable to initialize conn\n",
+				op->o_log_prefix, 0, 0 );
+			rs->sr_err = LDAP_UNAVAILABLE;
+			rs->sr_text = "unable to initialize connection to remote targets";
+			send_ldap_result( op, rs );
+			rc = -1;
+			goto finish;
+		}
+
+		/* FIXME: better create a separate connection? */
+		sendok |= LDAP_BACK_BINDING;
+
+#ifdef DEBUG_205
+		Debug( LDAP_DEBUG_ANY, "*** %s drop mc=%p create new connection\n",
+			op->o_log_prefix, (void *)mc, 0 );
+#endif /* DEBUG_205 */
+
+		meta_back_release_conn( mi, mc );
+		mc = NULL;
+
+		needbind = 0;
+		ncandidates = 0;
+
+		goto getconn;
+	}
+
+	initial_candidates = ncandidates;
+
+	if ( LogTest( LDAP_DEBUG_TRACE ) ) {
+		char	cnd[ SLAP_TEXT_BUFLEN ];
+		int	c;
+
+		for ( c = 0; c < mi->mi_ntargets; c++ ) {
+			if ( META_IS_CANDIDATE( &candidates[ c ] ) ) {
+				cnd[ c ] = '*';
+			} else {
+				cnd[ c ] = ' ';
+			}
+		}
+		cnd[ c ] = '\0';
+
+		Debug( LDAP_DEBUG_TRACE, "%s meta_back_search: ncandidates=%d "
+			"cnd=\"%s\"\n", op->o_log_prefix, ncandidates, cnd );
+	}
+
+	if ( initial_candidates == 0 ) {
+		/* NOTE: here we are not sending any matchedDN;
+		 * this is intended, because if the back-meta
+		 * is serving this search request, but no valid
+		 * candidate could be looked up, it means that
+		 * there is a hole in the mapping of the targets
+		 * and thus no knowledge of any remote superior
+		 * is available */
+		Debug( LDAP_DEBUG_ANY, "%s meta_back_search: "
+			"base=\"%s\" scope=%d: "
+			"no candidate could be selected\n",
+			op->o_log_prefix, op->o_req_dn.bv_val,
+			op->ors_scope );
+
+		/* FIXME: we're sending the first error we encounter;
+		 * maybe we should pick the worst... */
+		rc = LDAP_NO_SUCH_OBJECT;
+		for ( i = 0; i < mi->mi_ntargets; i++ ) {
+			if ( META_IS_CANDIDATE( &candidates[ i ] )
+				&& candidates[ i ].sr_err != LDAP_SUCCESS )
+			{
+				rc = candidates[ i ].sr_err;
+				break;
+			}
+		}
+
+		send_ldap_error( op, rs, rc, NULL );
+
+		goto finish;
+	}
+
+	/* We pull apart the ber result, stuff it into a slapd entry, and
+	 * let send_search_entry stuff it back into ber format. Slow & ugly,
+	 * but this is necessary for version matching, and for ACL processing.
+	 */
+
+	if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
+		stoptime = op->o_time + op->ors_tlimit;
+	}
+
+	/*
+	 * In case there are no candidates, no cycle takes place...
+	 *
+	 * FIXME: we might use a queue, to better balance the load 
+	 * among the candidates
+	 */
+	for ( rc = 0; ncandidates > 0; ) {
+		int	gotit = 0,
+			doabandon = 0,
+			alreadybound = ncandidates;
+
+		/* check timeout */
+		if ( timeout && lastres_time > 0
+			&& ( slap_get_time() - lastres_time ) > timeout )
+		{
+			doabandon = 1;
+			rs->sr_text = "Operation timed out";
+			rc = rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
+				LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
+			savepriv = op->o_private;
+			op->o_private = (void *)i;
+			send_ldap_result( op, rs );
+			op->o_private = savepriv;
+			goto finish;
+		}
+
+		/* check time limit */
+		if ( op->ors_tlimit != SLAP_NO_LIMIT
+				&& slap_get_time() > stoptime )
+		{
+			doabandon = 1;
+			rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
+			savepriv = op->o_private;
+			op->o_private = (void *)i;
+			send_ldap_result( op, rs );
+			op->o_private = savepriv;
+			goto finish;
+		}
+
+		for ( i = 0; i < mi->mi_ntargets; i++ ) {
+			meta_search_candidate_t	retcode = META_SEARCH_UNDEFINED;
+			metasingleconn_t	*msc = &mc->mc_conns[ i ];
+			LDAPMessage		*res = NULL, *msg;
+
+			/* if msgid is invalid, don't ldap_result() */
+			if ( candidates[ i ].sr_msgid == META_MSGID_IGNORE ) {
+				continue;
+			}
+
+			/* if target still needs bind, retry */
+			if ( candidates[ i ].sr_msgid == META_MSGID_NEED_BIND
+				|| candidates[ i ].sr_msgid == META_MSGID_CONNECTING )
+			{
+				/* initiate dobind */
+				retcode = meta_search_dobind_init( op, rs, &mc, i, candidates );
+
+				Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%ld]=%d\n",
+					op->o_log_prefix, i, retcode );
+
+				switch ( retcode ) {
+				case META_SEARCH_NEED_BIND:
+					alreadybound--;
+					/* fallthru */
+
+				case META_SEARCH_CONNECTING:
+				case META_SEARCH_BINDING:
+					break;
+
+				case META_SEARCH_ERR:
+					candidates[ i ].sr_err = rs->sr_err;
+					if ( META_BACK_ONERR_STOP( mi ) ) {
+						savepriv = op->o_private;
+						op->o_private = (void *)i;
+						send_ldap_result( op, rs );
+						op->o_private = savepriv;
+						goto finish;
+					}
+					/* fallthru */
+
+				case META_SEARCH_NOT_CANDIDATE:
+					/*
+					 * When no candidates are left,
+					 * the outer cycle finishes
+					 */
+					candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+					assert( ncandidates > 0 );
+					--ncandidates;
+					break;
+
+				case META_SEARCH_CANDIDATE:
+					candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+					switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates, NULL, 0 ) )
+					{
+					case META_SEARCH_CANDIDATE:
+						assert( candidates[ i ].sr_msgid >= 0 );
+						break;
+
+					case META_SEARCH_ERR:
+						candidates[ i ].sr_err = rs->sr_err;
+						if ( META_BACK_ONERR_STOP( mi ) ) {
+							savepriv = op->o_private;
+							op->o_private = (void *)i;
+							send_ldap_result( op, rs );
+							op->o_private = savepriv;
+							goto finish;
+						}
+						/* fallthru */
+
+					case META_SEARCH_NOT_CANDIDATE:
+						/* means that meta_back_search_start()
+						 * failed but onerr == continue */
+						candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+						assert( ncandidates > 0 );
+						--ncandidates;
+						break;
+
+					default:
+						/* impossible */
+						assert( 0 );
+						break;
+					}
+					break;
+
+				default:
+					/* impossible */
+					assert( 0 );
+					break;
+				}
+				continue;
+			}
+
+			/* check for abandon */
+			if ( op->o_abandon || LDAP_BACK_CONN_ABANDON( mc ) ) {
+				break;
+			}
+
+#ifdef DEBUG_205
+			if ( msc->msc_ld == NULL ) {
+				char	buf[ SLAP_TEXT_BUFLEN ];
+
+				ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+				snprintf( buf, sizeof( buf ),
+					"%s meta_back_search[%ld] mc=%p msgid=%d%s%s%s\n",
+					op->o_log_prefix, (long)i, (void *)mc,
+					candidates[ i ].sr_msgid,
+					META_IS_BINDING( &candidates[ i ] ) ? " binding" : "",
+					LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ? " connbinding" : "",
+					META_BACK_CONN_CREATING( &mc->mc_conns[ i ] ) ? " conncreating" : "" );
+				ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+					
+				Debug( LDAP_DEBUG_ANY, "!!! %s\n", buf, 0, 0 );
+			}
+#endif /* DEBUG_205 */
+			
+			/*
+			 * FIXME: handle time limit as well?
+			 * Note that target servers are likely 
+			 * to handle it, so at some time we'll
+			 * get a LDAP_TIMELIMIT_EXCEEDED from
+			 * one of them ...
+			 */
+			tv = save_tv;
+			rc = ldap_result( msc->msc_ld, candidates[ i ].sr_msgid,
+					LDAP_MSG_RECEIVED, &tv, &res );
+			switch ( rc ) {
+			case 0:
+				/* FIXME: res should not need to be freed */
+				assert( res == NULL );
+				continue;
+
+			case -1:
+really_bad:;
+				/* something REALLY bad happened! */
+				if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
+					candidates[ i ].sr_type = REP_RESULT;
+
+					if ( meta_back_retry( op, rs, &mc, i, LDAP_BACK_DONTSEND ) ) {
+						candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+						switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates, NULL, 0 ) )
+						{
+							/* means that failed but onerr == continue */
+						case META_SEARCH_NOT_CANDIDATE:
+							candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+
+							assert( ncandidates > 0 );
+							--ncandidates;
+
+							candidates[ i ].sr_err = rs->sr_err;
+							if ( META_BACK_ONERR_STOP( mi ) ) {
+								savepriv = op->o_private;
+								op->o_private = (void *)i;
+								send_ldap_result( op, rs );
+								op->o_private = savepriv;
+								goto finish;
+							}
+							/* fall thru */
+
+						case META_SEARCH_CANDIDATE:
+							/* get back into business... */
+							continue;
+
+						case META_SEARCH_BINDING:
+						case META_SEARCH_CONNECTING:
+						case META_SEARCH_NEED_BIND:
+						case META_SEARCH_UNDEFINED:
+							assert( 0 );
+
+						default:
+							/* unrecoverable error */
+							candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+							rc = rs->sr_err = LDAP_OTHER;
+							goto finish;
+						}
+					}
+
+					candidates[ i ].sr_err = rs->sr_err;
+					if ( META_BACK_ONERR_STOP( mi ) ) {
+						savepriv = op->o_private;
+						op->o_private = (void *)i;
+						send_ldap_result( op, rs );
+						op->o_private = savepriv;
+						goto finish;
+					}
+				}
+
+				/*
+				 * When no candidates are left,
+				 * the outer cycle finishes
+				 */
+				candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+				assert( ncandidates > 0 );
+				--ncandidates;
+				rs->sr_err = candidates[ i ].sr_err;
+				continue;
+
+			default:
+				lastres_time = slap_get_time();
+
+				/* only touch when activity actually took place... */
+				if ( mi->mi_idle_timeout != 0 && msc->msc_time < lastres_time ) {
+					msc->msc_time = lastres_time;
+				}
+				break;
+			}
+
+			for ( msg = ldap_first_message( msc->msc_ld, res );
+				msg != NULL;
+				msg = ldap_next_message( msc->msc_ld, msg ) )
+			{
+				rc = ldap_msgtype( msg );
+				if ( rc == LDAP_RES_SEARCH_ENTRY ) {
+					LDAPMessage	*e;
+
+					if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
+						/* don't retry any more... */
+						candidates[ i ].sr_type = REP_RESULT;
+					}
+
+					/* count entries returned by target */
+					candidates[ i ].sr_nentries++;
+
+					is_ok++;
+
+					e = ldap_first_entry( msc->msc_ld, msg );
+					savepriv = op->o_private;
+					op->o_private = (void *)i;
+					rs->sr_err = meta_send_entry( op, rs, mc, i, e );
+
+					switch ( rs->sr_err ) {
+					case LDAP_SIZELIMIT_EXCEEDED:
+						savepriv = op->o_private;
+						op->o_private = (void *)i;
+						send_ldap_result( op, rs );
+						op->o_private = savepriv;
+						rs->sr_err = LDAP_SUCCESS;
+						ldap_msgfree( res );
+						res = NULL;
+						goto finish;
+
+					case LDAP_UNAVAILABLE:
+						rs->sr_err = LDAP_OTHER;
+						ldap_msgfree( res );
+						res = NULL;
+						goto finish;
+					}
+					op->o_private = savepriv;
+
+					/* don't wait any longer... */
+					gotit = 1;
+					save_tv.tv_sec = 0;
+					save_tv.tv_usec = 0;
+
+				} else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
+					char		**references = NULL;
+					int		cnt;
+
+					if ( META_BACK_TGT_NOREFS( mi->mi_targets[ i ] ) ) {
+						continue;
+					}
+
+					if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
+						/* don't retry any more... */
+						candidates[ i ].sr_type = REP_RESULT;
+					}
+	
+					is_ok++;
+	
+					rc = ldap_parse_reference( msc->msc_ld, msg,
+							&references, &rs->sr_ctrls, 0 );
+	
+					if ( rc != LDAP_SUCCESS ) {
+						continue;
+					}
+	
+					if ( references == NULL ) {
+						continue;
+					}
+
+#ifdef ENABLE_REWRITE
+					dc.ctx = "referralDN";
+#else /* ! ENABLE_REWRITE */
+					dc.tofrom = 0;
+					dc.normalized = 0;
+#endif /* ! ENABLE_REWRITE */
+
+					/* FIXME: merge all and return at the end */
+	
+					for ( cnt = 0; references[ cnt ]; cnt++ )
+						;
+	
+					rs->sr_ref = ber_memalloc_x( sizeof( struct berval ) * ( cnt + 1 ),
+						op->o_tmpmemctx );
+	
+					for ( cnt = 0; references[ cnt ]; cnt++ ) {
+						ber_str2bv_x( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ],
+						op->o_tmpmemctx );
+					}
+					BER_BVZERO( &rs->sr_ref[ cnt ] );
+	
+					( void )ldap_back_referral_result_rewrite( &dc, rs->sr_ref,
+						op->o_tmpmemctx );
+
+					if ( rs->sr_ref != NULL && !BER_BVISNULL( &rs->sr_ref[ 0 ] ) ) {
+						/* ignore return value by now */
+						savepriv = op->o_private;
+						op->o_private = (void *)i;
+						( void )send_search_reference( op, rs );
+						op->o_private = savepriv;
+	
+						ber_bvarray_free_x( rs->sr_ref, op->o_tmpmemctx );
+						rs->sr_ref = NULL;
+					}
+
+					/* cleanup */
+					if ( references ) {
+						ber_memvfree( (void **)references );
+					}
+
+					if ( rs->sr_ctrls ) {
+						ldap_controls_free( rs->sr_ctrls );
+						rs->sr_ctrls = NULL;
+					}
+
+				} else if ( rc == LDAP_RES_INTERMEDIATE ) {
+					if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
+						/* don't retry any more... */
+						candidates[ i ].sr_type = REP_RESULT;
+					}
+	
+					/* FIXME: response controls
+					 * are passed without checks */
+					rs->sr_err = ldap_parse_intermediate( msc->msc_ld,
+						msg,
+						(char **)&rs->sr_rspoid,
+						&rs->sr_rspdata,
+						&rs->sr_ctrls,
+						0 );
+					if ( rs->sr_err != LDAP_SUCCESS ) {
+						candidates[ i ].sr_type = REP_RESULT;
+						ldap_msgfree( res );
+						res = NULL;
+						goto really_bad;
+					}
+
+					slap_send_ldap_intermediate( op, rs );
+
+					if ( rs->sr_rspoid != NULL ) {
+						ber_memfree( (char *)rs->sr_rspoid );
+						rs->sr_rspoid = NULL;
+					}
+
+					if ( rs->sr_rspdata != NULL ) {
+						ber_bvfree( rs->sr_rspdata );
+						rs->sr_rspdata = NULL;
+					}
+
+					if ( rs->sr_ctrls != NULL ) {
+						ldap_controls_free( rs->sr_ctrls );
+						rs->sr_ctrls = NULL;
+					}
+
+				} else if ( rc == LDAP_RES_SEARCH_RESULT ) {
+					char		buf[ SLAP_TEXT_BUFLEN ];
+					char		**references = NULL;
+					LDAPControl	**ctrls = NULL;
+
+					if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
+						/* don't retry any more... */
+						candidates[ i ].sr_type = REP_RESULT;
+					}
+	
+					candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+
+					/* NOTE: ignores response controls
+					 * (and intermediate response controls
+					 * as well, except for those with search
+					 * references); this may not be correct,
+					 * but if they're not ignored then
+					 * back-meta would need to merge them
+					 * consistently (think of pagedResults...)
+					 */
+					/* FIXME: response controls? */
+					rs->sr_err = ldap_parse_result( msc->msc_ld,
+						msg,
+						&candidates[ i ].sr_err,
+						(char **)&candidates[ i ].sr_matched,
+						(char **)&candidates[ i ].sr_text,
+						&references,
+						&ctrls /* &candidates[ i ].sr_ctrls (unused) */ ,
+						0 );
+					if ( rs->sr_err != LDAP_SUCCESS ) {
+						candidates[ i ].sr_err = rs->sr_err;
+						sres = slap_map_api2result( &candidates[ i ] );
+						candidates[ i ].sr_type = REP_RESULT;
+						ldap_msgfree( res );
+						res = NULL;
+						goto really_bad;
+					}
+
+					rs->sr_err = candidates[ i ].sr_err;
+
+					/* massage matchedDN if need be */
+					if ( candidates[ i ].sr_matched != NULL ) {
+						struct berval	match, mmatch;
+
+						ber_str2bv( candidates[ i ].sr_matched,
+							0, 0, &match );
+						candidates[ i ].sr_matched = NULL;
+
+						dc.ctx = "matchedDN";
+						dc.target = mi->mi_targets[ i ];
+						if ( !ldap_back_dn_massage( &dc, &match, &mmatch ) ) {
+							if ( mmatch.bv_val == match.bv_val ) {
+								candidates[ i ].sr_matched
+									= ch_strdup( mmatch.bv_val );
+
+							} else {
+								candidates[ i ].sr_matched = mmatch.bv_val;
+							}
+
+							candidate_match++;
+						} 
+						ldap_memfree( match.bv_val );
+					}
+
+					/* add references to array */
+					/* RFC 4511: referrals can only appear
+					 * if result code is LDAP_REFERRAL */
+					if ( references != NULL
+						&& references[ 0 ] != NULL
+						&& references[ 0 ][ 0 ] != '\0' )
+					{
+						if ( rs->sr_err != LDAP_REFERRAL ) {
+							Debug( LDAP_DEBUG_ANY,
+								"%s meta_back_search[%ld]: "
+								"got referrals with err=%d\n",
+								op->o_log_prefix,
+								i, rs->sr_err );
+
+						} else {
+							BerVarray	sr_ref;
+							int		cnt;
+	
+							for ( cnt = 0; references[ cnt ]; cnt++ )
+								;
+	
+							sr_ref = ber_memalloc_x( sizeof( struct berval ) * ( cnt + 1 ),
+								op->o_tmpmemctx );
+	
+							for ( cnt = 0; references[ cnt ]; cnt++ ) {
+								ber_str2bv_x( references[ cnt ], 0, 1, &sr_ref[ cnt ],
+									op->o_tmpmemctx );
+							}
+							BER_BVZERO( &sr_ref[ cnt ] );
+	
+							( void )ldap_back_referral_result_rewrite( &dc, sr_ref,
+								op->o_tmpmemctx );
+					
+							if ( rs->sr_v2ref == NULL ) {
+								rs->sr_v2ref = sr_ref;
+
+							} else {
+								for ( cnt = 0; !BER_BVISNULL( &sr_ref[ cnt ] ); cnt++ ) {
+									ber_bvarray_add_x( &rs->sr_v2ref, &sr_ref[ cnt ],
+										op->o_tmpmemctx );
+								}
+								ber_memfree_x( sr_ref, op->o_tmpmemctx );
+							}
+						}
+
+					} else if ( rs->sr_err == LDAP_REFERRAL ) {
+						Debug( LDAP_DEBUG_ANY,
+							"%s meta_back_search[%ld]: "
+							"got err=%d with null "
+							"or empty referrals\n",
+							op->o_log_prefix,
+							i, rs->sr_err );
+
+						rs->sr_err = LDAP_NO_SUCH_OBJECT;
+					}
+
+					/* cleanup */
+					ber_memvfree( (void **)references );
+
+					sres = slap_map_api2result( rs );
+	
+					if ( LogTest( LDAP_DEBUG_TRACE | LDAP_DEBUG_ANY ) ) {
+						snprintf( buf, sizeof( buf ),
+							"%s meta_back_search[%ld] "
+							"match=\"%s\" err=%ld",
+							op->o_log_prefix, i,
+							candidates[ i ].sr_matched ? candidates[ i ].sr_matched : "",
+							(long) candidates[ i ].sr_err );
+						if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
+							Debug( LDAP_DEBUG_TRACE, "%s.\n", buf, 0, 0 );
+	
+						} else {
+							Debug( LDAP_DEBUG_ANY, "%s (%s) text=\"%s\".\n",
+								buf, ldap_err2string( candidates[ i ].sr_err ),
+								candidates[ i ].sr_text ? candidates[i].sr_text : "" );
+						}
+					}
+	
+					switch ( sres ) {
+					case LDAP_NO_SUCH_OBJECT:
+						/* is_ok is touched any time a valid
+						 * (even intermediate) result is
+						 * returned; as a consequence, if
+						 * a candidate returns noSuchObject
+						 * it is ignored and the candidate
+						 * is simply demoted. */
+						if ( is_ok ) {
+							sres = LDAP_SUCCESS;
+						}
+						break;
+	
+					case LDAP_SUCCESS:
+						if ( ctrls != NULL && ctrls[0] != NULL ) {
+#ifdef SLAPD_META_CLIENT_PR
+							LDAPControl *pr_c;
+
+							pr_c = ldap_control_find( LDAP_CONTROL_PAGEDRESULTS, ctrls, NULL );
+							if ( pr_c != NULL ) {
+								BerElementBuffer berbuf;
+								BerElement *ber = (BerElement *)&berbuf;
+								ber_tag_t tag;
+								ber_int_t prsize;
+								struct berval prcookie;
+
+								/* unsolicited, do not accept */
+								if ( mi->mi_targets[i]->mt_ps == 0 ) {
+									rs->sr_err = LDAP_OTHER;
+									goto err_pr;
+								}
+
+								ber_init2( ber, &pr_c->ldctl_value, LBER_USE_DER );
+
+								tag = ber_scanf( ber, "{im}", &prsize, &prcookie );
+								if ( tag == LBER_ERROR ) {
+									rs->sr_err = LDAP_OTHER;
+									goto err_pr;
+								}
+
+								/* more pages? new search request */
+								if ( !BER_BVISNULL( &prcookie ) && !BER_BVISEMPTY( &prcookie ) ) {
+									if ( mi->mi_targets[i]->mt_ps > 0 ) {
+										/* ignore size if specified */
+										prsize = 0;
+
+									} else if ( prsize == 0 ) {
+										/* guess the page size from the entries returned so far */
+										prsize = candidates[ i ].sr_nentries;
+									}
+
+									candidates[ i ].sr_nentries = 0;
+									candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+									candidates[ i ].sr_type = REP_INTERMEDIATE;
+								
+									assert( candidates[ i ].sr_matched == NULL );
+									assert( candidates[ i ].sr_text == NULL );
+									assert( candidates[ i ].sr_ref == NULL );
+
+									switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates, &prcookie, prsize ) )
+									{
+									case META_SEARCH_CANDIDATE:
+										assert( candidates[ i ].sr_msgid >= 0 );
+										ldap_controls_free( ctrls );
+										goto free_message;
+
+									case META_SEARCH_ERR:
+err_pr:;
+										candidates[ i ].sr_err = rs->sr_err;
+										if ( META_BACK_ONERR_STOP( mi ) ) {
+											savepriv = op->o_private;
+											op->o_private = (void *)i;
+											send_ldap_result( op, rs );
+											op->o_private = savepriv;
+											ldap_controls_free( ctrls );
+											goto finish;
+										}
+										/* fallthru */
+
+									case META_SEARCH_NOT_CANDIDATE:
+										/* means that meta_back_search_start()
+										 * failed but onerr == continue */
+										candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+										assert( ncandidates > 0 );
+										--ncandidates;
+										break;
+
+									default:
+										/* impossible */
+										assert( 0 );
+										break;
+									}
+									break;
+								}
+							}
+#endif /* SLAPD_META_CLIENT_PR */
+						}
+						/* fallthru */
+
+					case LDAP_REFERRAL:
+						is_ok++;
+						break;
+	
+					case LDAP_SIZELIMIT_EXCEEDED:
+						/* if a target returned sizelimitExceeded
+						 * and the entry count is equal to the
+						 * proxy's limit, the target would have
+						 * returned more, and the error must be
+						 * propagated to the client; otherwise,
+						 * the target enforced a limit lower
+						 * than what requested by the proxy;
+						 * ignore it */
+						candidates[ i ].sr_err = rs->sr_err;
+						if ( rs->sr_nentries == op->ors_slimit
+							|| META_BACK_ONERR_STOP( mi ) )
+						{
+							const char *save_text;
+got_err:
+							save_text = rs->sr_text;
+							savepriv = op->o_private;
+							op->o_private = (void *)i;
+							rs->sr_text = candidates[ i ].sr_text;
+							send_ldap_result( op, rs );
+							rs->sr_text = save_text;
+							op->o_private = savepriv;
+							ldap_msgfree( res );
+							res = NULL;
+							ldap_controls_free( ctrls );
+							goto finish;
+						}
+						break;
+	
+					default:
+						candidates[ i ].sr_err = rs->sr_err;
+						if ( META_BACK_ONERR_STOP( mi ) )
+							goto got_err;
+						break;
+					}
+	
+					ldap_controls_free( ctrls );
+					last = i;
+					rc = 0;
+	
+					/*
+					 * When no candidates are left,
+					 * the outer cycle finishes
+					 */
+					assert( ncandidates > 0 );
+					--ncandidates;
+
+				} else if ( rc == LDAP_RES_BIND ) {
+					meta_search_candidate_t	retcode;
+	
+					retcode = meta_search_dobind_result( op, rs, &mc, i, candidates, msg );
+					if ( retcode == META_SEARCH_CANDIDATE ) {
+						candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+						retcode = meta_back_search_start( op, rs, &dc, &mc, i, candidates, NULL, 0 );
+					}
+	
+					switch ( retcode ) {
+					case META_SEARCH_CANDIDATE:
+						break;
+	
+						/* means that failed but onerr == continue */
+					case META_SEARCH_NOT_CANDIDATE:
+					case META_SEARCH_ERR:
+						candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+						assert( ncandidates > 0 );
+						--ncandidates;
+	
+						candidates[ i ].sr_err = rs->sr_err;
+						if ( META_BACK_ONERR_STOP( mi ) ) {
+							savepriv = op->o_private;
+							op->o_private = (void *)i;
+							send_ldap_result( op, rs );
+							op->o_private = savepriv;
+							ldap_msgfree( res );
+							res = NULL;
+							goto finish;
+						}
+						goto free_message;
+	
+					default:
+						assert( 0 );
+						break;
+					}
+	
+				} else {
+					Debug( LDAP_DEBUG_ANY,
+						"%s meta_back_search[%ld]: "
+						"unrecognized response message tag=%d\n",
+						op->o_log_prefix,
+						i, rc );
+				
+					ldap_msgfree( res );
+					res = NULL;
+					goto really_bad;
+				}
+			}
+
+free_message:;
+			ldap_msgfree( res );
+			res = NULL;
+		}
+
+		/* check for abandon */
+		if ( op->o_abandon || LDAP_BACK_CONN_ABANDON( mc ) ) {
+			for ( i = 0; i < mi->mi_ntargets; i++ ) {
+				if ( candidates[ i ].sr_msgid >= 0
+					|| candidates[ i ].sr_msgid == META_MSGID_CONNECTING )
+				{
+					if ( META_IS_BINDING( &candidates[ i ] )
+						|| candidates[ i ].sr_msgid == META_MSGID_CONNECTING )
+					{
+						ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+						if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] )
+							|| candidates[ i ].sr_msgid == META_MSGID_CONNECTING )
+						{
+							/* if still binding, destroy */
+
+#ifdef DEBUG_205
+							char buf[ SLAP_TEXT_BUFLEN ];
+
+							snprintf( buf, sizeof( buf), "%s meta_back_search(abandon) "
+								"ldap_unbind_ext[%ld] mc=%p ld=%p",
+								op->o_log_prefix, i, (void *)mc,
+								(void *)mc->mc_conns[i].msc_ld );
+
+							Debug( LDAP_DEBUG_ANY, "### %s\n", buf, 0, 0 );
+#endif /* DEBUG_205 */
+
+							meta_clear_one_candidate( op, mc, i );
+						}
+						ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+						META_BINDING_CLEAR( &candidates[ i ] );
+						
+					} else {
+						(void)meta_back_cancel( mc, op, rs,
+							candidates[ i ].sr_msgid, i,
+							LDAP_BACK_DONTSEND );
+					}
+
+					candidates[ i ].sr_msgid = META_MSGID_IGNORE;
+					assert( ncandidates > 0 );
+					--ncandidates;
+				}
+			}
+
+			if ( op->o_abandon ) {
+				rc = SLAPD_ABANDON;
+			}
+
+			/* let send_ldap_result play cleanup handlers (ITS#4645) */
+			break;
+		}
+
+		/* if no entry was found during this loop,
+		 * set a minimal timeout */
+		if ( ncandidates > 0 && gotit == 0 ) {
+			if ( save_tv.tv_sec == 0 && save_tv.tv_usec == 0 ) {
+				save_tv.tv_usec = LDAP_BACK_RESULT_UTIMEOUT/initial_candidates;
+
+				/* arbitrarily limit to something between 1 and 2 minutes */
+			} else if ( ( stoptime == -1 && save_tv.tv_sec < 60 )
+				|| save_tv.tv_sec < ( stoptime - slap_get_time() ) / ( 2 * ncandidates ) )
+			{
+				/* double the timeout */
+				lutil_timermul( &save_tv, 2, &save_tv );
+			}
+
+			if ( alreadybound == 0 ) {
+				tv = save_tv;
+				(void)select( 0, NULL, NULL, NULL, &tv );
+
+			} else {
+				ldap_pvt_thread_yield();
+			}
+		}
+	}
+
+	if ( rc == -1 ) {
+		/*
+		 * FIXME: need a better strategy to handle errors
+		 */
+		if ( mc ) {
+			rc = meta_back_op_result( mc, op, rs, META_TARGET_NONE,
+				-1, stoptime != -1 ? (stoptime - slap_get_time()) : 0,
+				LDAP_BACK_SENDERR );
+		} else {
+			rc = rs->sr_err;
+		}
+		goto finish;
+	}
+
+	/*
+	 * Rewrite the matched portion of the search base, if required
+	 * 
+	 * FIXME: only the last one gets caught!
+	 */
+	savepriv = op->o_private;
+	op->o_private = (void *)(long)mi->mi_ntargets;
+	if ( candidate_match > 0 ) {
+		struct berval	pmatched = BER_BVNULL;
+
+		/* we use the first one */
+		for ( i = 0; i < mi->mi_ntargets; i++ ) {
+			if ( META_IS_CANDIDATE( &candidates[ i ] )
+					&& candidates[ i ].sr_matched != NULL )
+			{
+				struct berval	bv, pbv;
+				int		rc;
+
+				/* if we got success, and this target
+				 * returned noSuchObject, and its suffix
+				 * is a superior of the searchBase,
+				 * ignore the matchedDN */
+				if ( sres == LDAP_SUCCESS
+					&& candidates[ i ].sr_err == LDAP_NO_SUCH_OBJECT
+					&& op->o_req_ndn.bv_len > mi->mi_targets[ i ]->mt_nsuffix.bv_len )
+				{
+					free( (char *)candidates[ i ].sr_matched );
+					candidates[ i ].sr_matched = NULL;
+					continue;
+				}
+
+				ber_str2bv( candidates[ i ].sr_matched, 0, 0, &bv );
+				rc = dnPretty( NULL, &bv, &pbv, op->o_tmpmemctx );
+
+				if ( rc == LDAP_SUCCESS ) {
+
+					/* NOTE: if they all are superiors
+					 * of the baseDN, the shorter is also 
+					 * superior of the longer... */
+					if ( pbv.bv_len > pmatched.bv_len ) {
+						if ( !BER_BVISNULL( &pmatched ) ) {
+							op->o_tmpfree( pmatched.bv_val, op->o_tmpmemctx );
+						}
+						pmatched = pbv;
+						op->o_private = (void *)i;
+
+					} else {
+						op->o_tmpfree( pbv.bv_val, op->o_tmpmemctx );
+					}
+				}
+
+				if ( candidates[ i ].sr_matched != NULL ) {
+					free( (char *)candidates[ i ].sr_matched );
+					candidates[ i ].sr_matched = NULL;
+				}
+			}
+		}
+
+		if ( !BER_BVISNULL( &pmatched ) ) {
+			matched = pmatched.bv_val;
+		}
+
+	} else if ( sres == LDAP_NO_SUCH_OBJECT ) {
+		matched = op->o_bd->be_suffix[ 0 ].bv_val;
+	}
+
+	/*
+	 * In case we returned at least one entry, we return LDAP_SUCCESS
+	 * otherwise, the latter error code we got
+	 */
+
+	if ( sres == LDAP_SUCCESS ) {
+		if ( rs->sr_v2ref ) {
+			sres = LDAP_REFERRAL;
+		}
+
+		if ( META_BACK_ONERR_REPORT( mi ) ) {
+			/*
+			 * Report errors, if any
+			 *
+			 * FIXME: we should handle error codes and return the more 
+			 * important/reasonable
+			 */
+			for ( i = 0; i < mi->mi_ntargets; i++ ) {
+				if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
+					continue;
+				}
+
+				if ( candidates[ i ].sr_err != LDAP_SUCCESS
+					&& candidates[ i ].sr_err != LDAP_NO_SUCH_OBJECT )
+				{
+					sres = candidates[ i ].sr_err;
+					break;
+				}
+			}
+		}
+	}
+
+	rs->sr_err = sres;
+	rs->sr_matched = ( sres == LDAP_SUCCESS ? NULL : matched );
+	rs->sr_ref = ( sres == LDAP_REFERRAL ? rs->sr_v2ref : NULL );
+	send_ldap_result( op, rs );
+	op->o_private = savepriv;
+	rs->sr_matched = NULL;
+	rs->sr_ref = NULL;
+
+finish:;
+	if ( matched && matched != op->o_bd->be_suffix[ 0 ].bv_val ) {
+		op->o_tmpfree( matched, op->o_tmpmemctx );
+	}
+
+	if ( rs->sr_v2ref ) {
+		ber_bvarray_free_x( rs->sr_v2ref, op->o_tmpmemctx );
+	}
+
+	for ( i = 0; i < mi->mi_ntargets; i++ ) {
+		if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
+			continue;
+		}
+
+		if ( mc ) {
+			if ( META_IS_BINDING( &candidates[ i ] )
+				|| candidates[ i ].sr_msgid == META_MSGID_CONNECTING )
+			{
+				ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+				if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] )
+					|| candidates[ i ].sr_msgid == META_MSGID_CONNECTING )
+				{
+					assert( candidates[ i ].sr_msgid >= 0
+						|| candidates[ i ].sr_msgid == META_MSGID_CONNECTING );
+					assert( mc->mc_conns[ i ].msc_ld != NULL );
+
+#ifdef DEBUG_205
+					Debug( LDAP_DEBUG_ANY, "### %s meta_back_search(cleanup) "
+						"ldap_unbind_ext[%ld] ld=%p\n",
+						op->o_log_prefix, i, (void *)mc->mc_conns[i].msc_ld );
+#endif /* DEBUG_205 */
+
+					/* if still binding, destroy */
+					meta_clear_one_candidate( op, mc, i );
+				}
+				ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+				META_BINDING_CLEAR( &candidates[ i ] );
+
+			} else if ( candidates[ i ].sr_msgid >= 0 ) {
+				(void)meta_back_cancel( mc, op, rs,
+					candidates[ i ].sr_msgid, i,
+					LDAP_BACK_DONTSEND );
+			}
+		}
+
+		if ( candidates[ i ].sr_matched ) {
+			free( (char *)candidates[ i ].sr_matched );
+			candidates[ i ].sr_matched = NULL;
+		}
+
+		if ( candidates[ i ].sr_text ) {
+			ldap_memfree( (char *)candidates[ i ].sr_text );
+			candidates[ i ].sr_text = NULL;
+		}
+
+		if ( candidates[ i ].sr_ref ) {
+			ber_bvarray_free( candidates[ i ].sr_ref );
+			candidates[ i ].sr_ref = NULL;
+		}
+
+		if ( candidates[ i ].sr_ctrls ) {
+			ldap_controls_free( candidates[ i ].sr_ctrls );
+			candidates[ i ].sr_ctrls = NULL;
+		}
+
+		if ( META_BACK_TGT_QUARANTINE( mi->mi_targets[ i ] ) ) {
+			meta_back_quarantine( op, &candidates[ i ], i );
+		}
+
+		/* only in case of timelimit exceeded, if the timelimit exceeded because
+		 * one contacted target never responded, invalidate the connection
+		 * NOTE: should we quarantine the target as well?  right now, the connection
+		 * is invalidated; the next time it will be recreated and the target
+		 * will be quarantined if it cannot be contacted */
+		if ( mi->mi_idle_timeout != 0
+			&& rs->sr_err == LDAP_TIMELIMIT_EXCEEDED
+			&& op->o_time > mc->mc_conns[ i ].msc_time )
+		{
+			/* don't let anyone else use this expired connection */
+			do_taint++;
+		}
+	}
+
+	if ( mc ) {
+		ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
+		if ( do_taint ) {
+			LDAP_BACK_CONN_TAINTED_SET( mc );
+		}
+		meta_back_release_conn_lock( mi, mc, 0 );
+		ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
+	}
+
+	return rs->sr_err;
+}
+
+static int
+meta_send_entry(
+	Operation 	*op,
+	SlapReply	*rs,
+	metaconn_t	*mc,
+	int 		target,
+	LDAPMessage 	*e )
+{
+	metainfo_t 		*mi = ( metainfo_t * )op->o_bd->be_private;
+	struct berval		a, mapped;
+	int			check_duplicate_attrs = 0;
+	int			check_sorted_attrs = 0;
+	Entry 			ent = { 0 };
+	BerElement 		ber = *ldap_get_message_ber( e );
+	Attribute 		*attr, **attrp;
+	struct berval 		bdn,
+				dn = BER_BVNULL;
+	const char 		*text;
+	dncookie		dc;
+	ber_len_t		len;
+	int			rc;
+
+	if ( ber_scanf( &ber, "l{", &len ) == LBER_ERROR ) {
+		return LDAP_DECODING_ERROR;
+	}
+
+	if ( ber_set_option( &ber, LBER_OPT_REMAINING_BYTES, &len ) != LBER_OPT_SUCCESS ) {
+		return LDAP_OTHER;
+	}
+
+	if ( ber_scanf( &ber, "m{", &bdn ) == LBER_ERROR ) {
+		return LDAP_DECODING_ERROR;
+	}
+
+	/*
+	 * Rewrite the dn of the result, if needed
+	 */
+	dc.target = mi->mi_targets[ target ];
+	dc.conn = op->o_conn;
+	dc.rs = rs;
+	dc.ctx = "searchResult";
+
+	rs->sr_err = ldap_back_dn_massage( &dc, &bdn, &dn );
+	if ( rs->sr_err != LDAP_SUCCESS) {
+		return rs->sr_err;
+	}
+
+	/*
+	 * Note: this may fail if the target host(s) schema differs
+	 * from the one known to the meta, and a DN with unknown
+	 * attributes is returned.
+	 * 
+	 * FIXME: should we log anything, or delegate to dnNormalize?
+	 */
+	rc = dnPrettyNormal( NULL, &dn, &ent.e_name, &ent.e_nname,
+		op->o_tmpmemctx );
+	if ( dn.bv_val != bdn.bv_val ) {
+		free( dn.bv_val );
+	}
+	BER_BVZERO( &dn );
+
+	if ( rc != LDAP_SUCCESS ) {
+		Debug( LDAP_DEBUG_ANY,
+			"%s meta_send_entry(\"%s\"): "
+			"invalid DN syntax\n",
+			op->o_log_prefix, ent.e_name.bv_val, 0 );
+		rc = LDAP_INVALID_DN_SYNTAX;
+		goto done;
+	}
+
+	/*
+	 * cache dn
+	 */
+	if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
+		( void )meta_dncache_update_entry( &mi->mi_cache,
+				&ent.e_nname, target );
+	}
+
+	attrp = &ent.e_attrs;
+
+	dc.ctx = "searchAttrDN";
+	while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
+		int				last = 0;
+		slap_syntax_validate_func	*validate;
+		slap_syntax_transform_func	*pretty;
+
+		if ( ber_pvt_ber_remaining( &ber ) < 0 ) {
+			Debug( LDAP_DEBUG_ANY,
+				"%s meta_send_entry(\"%s\"): "
+				"unable to parse attr \"%s\".\n",
+				op->o_log_prefix, ent.e_name.bv_val, a.bv_val );
+				
+			rc = LDAP_OTHER;
+			goto done;
+		}
+
+		if ( ber_pvt_ber_remaining( &ber ) == 0 ) {
+			break;
+		}
+
+		ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_at, 
+				&a, &mapped, BACKLDAP_REMAP );
+		if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0' ) {
+			( void )ber_scanf( &ber, "x" /* [W] */ );
+			continue;
+		}
+		if ( mapped.bv_val != a.bv_val ) {
+			/* will need to check for duplicate attrs */
+			check_duplicate_attrs++;
+		}
+		attr = attr_alloc( NULL );
+		if ( attr == NULL ) {
+			rc = LDAP_OTHER;
+			goto done;
+		}
+		if ( slap_bv2ad( &mapped, &attr->a_desc, &text )
+				!= LDAP_SUCCESS) {
+			if ( slap_bv2undef_ad( &mapped, &attr->a_desc, &text,
+				SLAP_AD_PROXIED ) != LDAP_SUCCESS )
+			{
+				char	buf[ SLAP_TEXT_BUFLEN ];
+
+				snprintf( buf, sizeof( buf ),
+					"%s meta_send_entry(\"%s\"): "
+					"slap_bv2undef_ad(%s): %s\n",
+					op->o_log_prefix, ent.e_name.bv_val,
+					mapped.bv_val, text );
+
+				Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
+				( void )ber_scanf( &ber, "x" /* [W] */ );
+				attr_free( attr );
+				continue;
+			}
+		}
+
+		if ( attr->a_desc->ad_type->sat_flags & SLAP_AT_SORTED_VAL )
+			check_sorted_attrs = 1;
+
+		/* no subschemaSubentry */
+		if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
+			|| attr->a_desc == slap_schema.si_ad_entryDN )
+		{
+
+			/* 
+			 * We eat target's subschemaSubentry because
+			 * a search for this value is likely not
+			 * to resolve to the appropriate backend;
+			 * later, the local subschemaSubentry is
+			 * added.
+			 *
+			 * We also eat entryDN because the frontend
+			 * will reattach it without checking if already
+			 * present...
+			 */
+			( void )ber_scanf( &ber, "x" /* [W] */ );
+			attr_free(attr);
+			continue;
+		}
+
+		if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR 
+				|| attr->a_vals == NULL )
+		{
+			attr->a_vals = (struct berval *)&slap_dummy_bv;
+
+		} else {
+			for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); ++last )
+				;
+		}
+		attr->a_numvals = last;
+
+		validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
+		pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
+
+		if ( !validate && !pretty ) {
+			attr_free( attr );
+			goto next_attr;
+		}
+
+		if ( attr->a_desc == slap_schema.si_ad_objectClass
+				|| attr->a_desc == slap_schema.si_ad_structuralObjectClass )
+		{
+			struct berval 	*bv;
+
+			for ( bv = attr->a_vals; !BER_BVISNULL( bv ); bv++ ) {
+				ObjectClass *oc;
+
+				ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_oc,
+						bv, &mapped, BACKLDAP_REMAP );
+				if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0') {
+remove_oc:;
+					free( bv->bv_val );
+					BER_BVZERO( bv );
+					if ( --last < 0 ) {
+						break;
+					}
+					*bv = attr->a_vals[ last ];
+					BER_BVZERO( &attr->a_vals[ last ] );
+					bv--;
+
+				} else if ( mapped.bv_val != bv->bv_val ) {
+					int	i;
+
+					for ( i = 0; !BER_BVISNULL( &attr->a_vals[ i ] ); i++ ) {
+						if ( &attr->a_vals[ i ] == bv ) {
+							continue;
+						}
+
+						if ( ber_bvstrcasecmp( &mapped, &attr->a_vals[ i ] ) == 0 ) {
+							break;
+						}
+					}
+
+					if ( !BER_BVISNULL( &attr->a_vals[ i ] ) ) {
+						goto remove_oc;
+					}
+
+					ber_bvreplace( bv, &mapped );
+
+				} else if ( ( oc = oc_bvfind_undef( bv ) ) == NULL ) {
+					goto remove_oc;
+
+				} else {
+					ber_bvreplace( bv, &oc->soc_cname );
+				}
+			}
+		/*
+		 * It is necessary to try to rewrite attributes with
+		 * dn syntax because they might be used in ACLs as
+		 * members of groups; since ACLs are applied to the
+		 * rewritten stuff, no dn-based subecj clause could
+		 * be used at the ldap backend side (see
+		 * http://www.OpenLDAP.org/faq/data/cache/452.html)
+		 * The problem can be overcome by moving the dn-based
+		 * ACLs to the target directory server, and letting
+		 * everything pass thru the ldap backend.
+		 */
+		} else {
+			int	i;
+
+			if ( attr->a_desc->ad_type->sat_syntax ==
+				slap_schema.si_syn_distinguishedName )
+			{
+				ldap_dnattr_result_rewrite( &dc, attr->a_vals );
+
+			} else if ( attr->a_desc == slap_schema.si_ad_ref ) {
+				ldap_back_referral_result_rewrite( &dc, attr->a_vals, NULL );
+
+			}
+
+			for ( i = 0; i < last; i++ ) {
+				struct berval	pval;
+				int		rc;
+
+				if ( pretty ) {
+					rc = ordered_value_pretty( attr->a_desc,
+						&attr->a_vals[i], &pval, NULL );
+
+				} else {
+					rc = ordered_value_validate( attr->a_desc,
+						&attr->a_vals[i], 0 );
+				}
+
+				if ( rc ) {
+					ber_memfree( attr->a_vals[i].bv_val );
+					if ( --last == i ) {
+						BER_BVZERO( &attr->a_vals[ i ] );
+						break;
+					}
+					attr->a_vals[i] = attr->a_vals[last];
+					BER_BVZERO( &attr->a_vals[last] );
+					i--;
+					continue;
+				}
+
+				if ( pretty ) {
+					ber_memfree( attr->a_vals[i].bv_val );
+					attr->a_vals[i] = pval;
+				}
+			}
+
+			if ( last == 0 && attr->a_vals != &slap_dummy_bv ) {
+				attr_free( attr );
+				goto next_attr;
+			}
+		}
+
+		if ( last && attr->a_desc->ad_type->sat_equality &&
+			attr->a_desc->ad_type->sat_equality->smr_normalize )
+		{
+			int i;
+
+			attr->a_nvals = ch_malloc( ( last + 1 ) * sizeof( struct berval ) );
+			for ( i = 0; i<last; i++ ) {
+				/* if normalizer fails, drop this value */
+				if ( ordered_value_normalize(
+					SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
+					attr->a_desc,
+					attr->a_desc->ad_type->sat_equality,
+					&attr->a_vals[i], &attr->a_nvals[i],
+					NULL )) {
+					ber_memfree( attr->a_vals[i].bv_val );
+					if ( --last == i ) {
+						BER_BVZERO( &attr->a_vals[ i ] );
+						break;
+					}
+					attr->a_vals[i] = attr->a_vals[last];
+					BER_BVZERO( &attr->a_vals[last] );
+					i--;
+				}
+			}
+			BER_BVZERO( &attr->a_nvals[i] );
+			if ( last == 0 ) {
+				attr_free( attr );
+				goto next_attr;
+			}
+
+		} else {
+			attr->a_nvals = attr->a_vals;
+		}
+
+		attr->a_numvals = last;
+		*attrp = attr;
+		attrp = &attr->a_next;
+next_attr:;
+	}
+
+	/* only check if some mapping occurred */
+	if ( check_duplicate_attrs ) {
+		Attribute	**ap;
+
+		for ( ap = &ent.e_attrs; *ap != NULL; ap = &(*ap)->a_next ) {
+			Attribute	**tap;
+
+			for ( tap = &(*ap)->a_next; *tap != NULL; ) {
+				if ( (*tap)->a_desc == (*ap)->a_desc ) {
+					Entry		e = { 0 };
+					Modification	mod = { 0 };
+					const char	*text = NULL;
+					char		textbuf[ SLAP_TEXT_BUFLEN ];
+					Attribute	*next = (*tap)->a_next;
+
+					BER_BVSTR( &e.e_name, "" );
+					BER_BVSTR( &e.e_nname, "" );
+					e.e_attrs = *ap;
+					mod.sm_op = LDAP_MOD_ADD;
+					mod.sm_desc = (*ap)->a_desc;
+					mod.sm_type = mod.sm_desc->ad_cname;
+					mod.sm_numvals = (*ap)->a_numvals;
+					mod.sm_values = (*tap)->a_vals;
+					if ( (*tap)->a_nvals != (*tap)->a_vals ) {
+						mod.sm_nvalues = (*tap)->a_nvals;
+					}
+
+					(void)modify_add_values( &e, &mod,
+						/* permissive */ 1,
+						&text, textbuf, sizeof( textbuf ) );
+
+					/* should not insert new attrs! */
+					assert( e.e_attrs == *ap );
+
+					attr_free( *tap );
+					*tap = next;
+
+				} else {
+					tap = &(*tap)->a_next;
+				}
+			}
+		}
+	}
+
+	/* Check for sorted attributes */
+	if ( check_sorted_attrs ) {
+		for ( attr = ent.e_attrs; attr; attr = attr->a_next ) {
+			if ( attr->a_desc->ad_type->sat_flags & SLAP_AT_SORTED_VAL ) {
+				while ( attr->a_numvals > 1 ) {
+					int i;
+					int rc = slap_sort_vals( (Modifications *)attr, &text, &i, op->o_tmpmemctx );
+					if ( rc != LDAP_TYPE_OR_VALUE_EXISTS )
+						break;
+
+					/* Strip duplicate values */
+					if ( attr->a_nvals != attr->a_vals )
+						ber_memfree( attr->a_nvals[i].bv_val );
+					ber_memfree( attr->a_vals[i].bv_val );
+					attr->a_numvals--;
+					if ( (unsigned)i < attr->a_numvals ) {
+						attr->a_vals[i] = attr->a_vals[attr->a_numvals];
+						if ( attr->a_nvals != attr->a_vals )
+							attr->a_nvals[i] = attr->a_nvals[attr->a_numvals];
+					}
+					BER_BVZERO(&attr->a_vals[attr->a_numvals]);
+					if ( attr->a_nvals != attr->a_vals )
+						BER_BVZERO(&attr->a_nvals[attr->a_numvals]);
+				}
+				attr->a_flags |= SLAP_ATTR_SORTED_VALS;
+			}
+		}
+	}
+
+	ldap_get_entry_controls( mc->mc_conns[target].msc_ld,
+		e, &rs->sr_ctrls );
+	rs->sr_entry = &ent;
+	rs->sr_attrs = op->ors_attrs;
+	rs->sr_operational_attrs = NULL;
+	rs->sr_flags = mi->mi_targets[ target ]->mt_rep_flags;
+	rs->sr_err = LDAP_SUCCESS;
+	rc = send_search_entry( op, rs );
+	switch ( rc ) {
+	case LDAP_UNAVAILABLE:
+		rc = LDAP_OTHER;
+		break;
+	}
+
+done:;
+	rs->sr_entry = NULL;
+	rs->sr_attrs = NULL;
+	if ( rs->sr_ctrls != NULL ) {
+		ldap_controls_free( rs->sr_ctrls );
+		rs->sr_ctrls = NULL;
+	}
+	if ( !BER_BVISNULL( &ent.e_name ) ) {
+		free( ent.e_name.bv_val );
+		BER_BVZERO( &ent.e_name );
+	}
+	if ( !BER_BVISNULL( &ent.e_nname ) ) {
+		free( ent.e_nname.bv_val );
+		BER_BVZERO( &ent.e_nname );
+	}
+	entry_clean( &ent );
+
+	return rc;
+}
+