2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 * Copyright 1999-2006 The OpenLDAP Foundation.
5 * Portions Copyright 2001-2003 Pierangelo Masarati.
6 * Portions Copyright 1999-2003 Howard Chu.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted only as authorized by the OpenLDAP
13 * A copy of this license is available in the file LICENSE in the
14 * top-level directory of the distribution or, alternatively, at
15 * <http://www.OpenLDAP.org/license.html>.
18 * This work was initially developed by the Howard Chu for inclusion
19 * in OpenLDAP Software and subsequently enhanced by Pierangelo
28 #include <ac/socket.h>
29 #include <ac/string.h>
34 #include "../back-ldap/back-ldap.h"
35 #include "back-meta.h"
38 * Set PRINT_CONNTREE larger than 0 to dump the connection tree (debug only)
40 #define PRINT_CONNTREE 0
45 * compares two struct metaconn based on the value of the conn pointer;
53 metaconn_t *mc1 = ( metaconn_t * )c1;
54 metaconn_t *mc2 = ( metaconn_t * )c2;
57 /* If local DNs don't match, it is definitely not a match */
58 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
63 /* For shared sessions, conn is NULL. Only explicitly
64 * bound sessions will have non-NULL conn.
66 return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
72 * returns -1 in case a duplicate struct metaconn has been inserted;
80 metaconn_t *mc1 = ( metaconn_t * )c1;
81 metaconn_t *mc2 = ( metaconn_t * )c2;
83 /* Cannot have more than one shared session with same DN */
84 if ( dn_match( &mc1->mc_local_ndn, &mc2->mc_local_ndn ) &&
85 mc1->mc_conn == mc2->mc_conn )
94 * Debug stuff (got it from libavl)
96 #if PRINT_CONNTREE > 0
98 ravl_print( Avlnode *root, int depth )
101 metaconn_t *mc = (metaconn_t *)root->avl_data;
107 ravl_print( root->avl_right, depth + 1 );
109 for ( i = 0; i < depth; i++ ) {
113 printf( "c(%d%s%s) %d\n",
114 LDAP_BACK_PCONN_ID( mc->mc_conn ),
115 BER_BVISNULL( &mc->mc_local_ndn ) ? "" : ": ",
116 BER_BVISNULL( &mc->mc_local_ndn ) ? "" : mc->mc_local_ndn.bv_val,
119 ravl_print( root->avl_left, depth + 1 );
123 myprint( Avlnode *root )
125 printf( "********\n" );
128 printf( "\tNULL\n" );
130 ravl_print( root, 0 );
133 printf( "********\n" );
135 #endif /* PRINT_CONNTREE */
143 * Allocates a connection structure, making room for all the referenced targets
149 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
151 int i, ntargets = mi->mi_ntargets;
153 assert( ntargets > 0 );
155 /* malloc all in one */
156 mc = ( metaconn_t * )ch_malloc( sizeof( metaconn_t )
157 + sizeof( metasingleconn_t ) * ntargets );
162 for ( i = 0; i < ntargets; i++ ) {
163 mc->mc_conns[ i ].msc_ld = NULL;
164 BER_BVZERO( &mc->mc_conns[ i ].msc_bound_ndn );
165 BER_BVZERO( &mc->mc_conns[ i ].msc_cred );
166 LDAP_BACK_CONN_ISBOUND_CLEAR( &mc->mc_conns[ i ] );
167 mc->mc_conns[ i ].msc_info = mi;
170 BER_BVZERO( &mc->mc_local_ndn );
171 mc->msc_mscflags = 0;
172 mc->mc_authz_target = META_BOUND_NONE;
173 ldap_pvt_thread_mutex_init( &mc->mc_mutex );
185 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
187 assert( mc != NULL );
189 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
191 if ( --mc->mc_refcnt == 0 ) {
192 meta_back_conn_free( mc );
195 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
199 * meta_back_init_one_conn
201 * Initializes one connection
204 meta_back_init_one_conn(
211 ldap_back_send_t sendok )
213 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
214 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
217 int isauthz = ( candidate == mc->mc_authz_target );
222 if ( msc->msc_ld != NULL ) {
225 if ( ( mt->mt_idle_timeout != 0 && op->o_time > msc->msc_time + mt->mt_idle_timeout )
226 || ( mt->mt_conn_ttl != 0 && op->o_time > msc->msc_create_time + mt->mt_conn_ttl ) )
228 Debug( LDAP_DEBUG_TRACE,
229 "%s meta_back_init_one_conn[%d]: idle timeout/ttl.\n",
230 op->o_log_prefix, candidate, 0 );
231 if ( meta_back_retry( op, rs, mc, candidate, sendok ) ) {
238 if ( mt->mt_idle_timeout != 0 ) {
239 msc->msc_time = op->o_time;
243 return rs->sr_err = LDAP_SUCCESS;
248 * Attempts to initialize the connection to the target ds
250 rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
251 if ( rs->sr_err != LDAP_SUCCESS ) {
256 * Set LDAP version. This will always succeed: If the client
257 * bound with a particular version, then so can we.
259 vers = op->o_conn->c_protocol;
260 ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &vers );
262 /* automatically chase referrals ("chase-referrals"/"dont-chase-referrals" statement) */
263 if ( LDAP_BACK_CHASE_REFERRALS( mi ) ) {
264 ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
268 /* start TLS ("tls [try-]{start|propagate}" statement) */
269 if ( ( LDAP_BACK_USE_TLS( mi ) || ( op->o_conn->c_is_tls && LDAP_BACK_PROPAGATE_TLS( mi ) ) )
270 && !ldap_is_ldaps_url( mt->mt_uri ) )
272 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
274 * use asynchronous StartTLS; in case, chase referral
275 * FIXME: OpenLDAP does not return referral on StartTLS yet
279 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
280 if ( rs->sr_err == LDAP_SUCCESS ) {
281 LDAPMessage *res = NULL;
282 int rc, nretries = mt->mt_nretries;
285 LDAP_BACK_TV_SET( &tv );
288 rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
290 rs->sr_err = LDAP_OTHER;
292 } else if ( rc == 0 ) {
293 if ( nretries != 0 ) {
294 if ( nretries > 0 ) {
297 LDAP_BACK_TV_SET( &tv );
300 rs->sr_err = LDAP_OTHER;
302 } else if ( rc == LDAP_RES_EXTENDED ) {
303 struct berval *data = NULL;
305 rs->sr_err = ldap_parse_extended_result( msc->msc_ld, res,
307 if ( rs->sr_err == LDAP_SUCCESS ) {
310 rs->sr_err = ldap_parse_result( msc->msc_ld, res,
311 &err, NULL, NULL, NULL, NULL, 1 );
314 if ( rs->sr_err == LDAP_SUCCESS ) {
318 /* FIXME: in case a referral
319 * is returned, should we try
320 * using it instead of the
322 if ( rs->sr_err == LDAP_SUCCESS ) {
323 ldap_install_tls( msc->msc_ld );
325 } else if ( rs->sr_err == LDAP_REFERRAL ) {
326 rs->sr_err = LDAP_OTHER;
327 rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
331 if ( data->bv_val ) {
332 ber_memfree( data->bv_val );
339 rs->sr_err = LDAP_OTHER;
346 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
348 * use synchronous StartTLS
350 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
351 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
353 /* if StartTLS is requested, only attempt it if the URL
354 * is not "ldaps://"; this may occur not only in case
355 * of misconfiguration, but also when used in the chain
356 * overlay, where the "uri" can be parsed out of a referral */
357 if ( rs->sr_err == LDAP_SERVER_DOWN
358 || ( rs->sr_err != LDAP_SUCCESS && LDAP_BACK_TLS_CRITICAL( mi ) ) )
360 ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
364 #endif /* HAVE_TLS */
367 * Set the network timeout if set
369 if ( mt->mt_network_timeout != 0 ) {
370 struct timeval network_timeout;
372 network_timeout.tv_usec = 0;
373 network_timeout.tv_sec = mt->mt_network_timeout;
375 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
376 (void *)&network_timeout );
380 * If the connection DN is not null, an attempt to rewrite it is made
384 if ( !BER_BVISNULL( &mt->mt_pseudorootdn ) ) {
385 ber_dupbv( &msc->msc_bound_ndn, &mt->mt_pseudorootdn );
386 if ( !BER_BVISNULL( &mt->mt_pseudorootpw ) ) {
387 ber_dupbv( &msc->msc_cred, &mt->mt_pseudorootpw );
391 ber_str2bv( "", 0, 1, &msc->msc_bound_ndn );
394 LDAP_BACK_CONN_ISPRIV_SET( msc );
397 BER_BVZERO( &msc->msc_cred );
398 BER_BVZERO( &msc->msc_bound_ndn );
399 if ( !BER_BVISEMPTY( &op->o_ndn )
400 && SLAP_IS_AUTHZ_BACKEND( op )
404 dc.conn = op->o_conn;
409 * Rewrite the bind dn if needed
411 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
412 &msc->msc_bound_ndn ) )
414 ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
418 /* copy the DN idf needed */
419 if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
420 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
424 ber_str2bv( "", 0, 1, &msc->msc_bound_ndn );
428 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
430 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
433 if ( rs->sr_err == LDAP_SUCCESS ) {
435 * Sets a cookie for the rewrite session
437 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
439 if ( mt->mt_idle_timeout ) {
440 msc->msc_time = op->o_time;
443 if ( mt->mt_conn_ttl ) {
444 msc->msc_create_time = op->o_time;
448 rs->sr_err = slap_map_api2result( rs );
449 if ( sendok & LDAP_BACK_SENDERR ) {
450 send_ldap_result( op, rs );
459 * meta_back_retry_lock
461 * Retries one connection
464 meta_back_retry_lock(
469 ldap_back_send_t sendok,
472 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
473 metatarget_t *mt = &mi->mi_targets[ candidate ];
474 int rc = LDAP_UNAVAILABLE;
475 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
478 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
480 assert( mc->mc_refcnt > 0 );
482 if ( mc->mc_refcnt == 1 ) {
483 char buf[ SLAP_TEXT_BUFLEN ];
485 while ( dolock && ldap_pvt_thread_mutex_trylock( &mc->mc_mutex ) ) {
486 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
487 ldap_pvt_thread_yield();
491 snprintf( buf, sizeof( buf ),
492 "retrying URI=\"%s\" DN=\"%s\"",
494 BER_BVISNULL( &msc->msc_bound_ndn ) ?
495 "" : msc->msc_bound_ndn.bv_val );
496 Debug( LDAP_DEBUG_ANY,
497 "%s meta_back_retry[%d]: %s.\n",
498 op->o_log_prefix, candidate, buf );
500 meta_clear_one_candidate( msc );
501 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
503 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
505 /* mc here must be the regular mc, reset and ready for init */
506 rc = meta_back_init_one_conn( op, rs, mt, mc, candidate,
507 LDAP_BACK_CONN_ISPRIV( mc ), sendok );
509 if ( rc == LDAP_SUCCESS ) {
510 if ( be_isroot( op ) && !BER_BVISNULL( &mi->mi_targets[ candidate ].mt_pseudorootdn ) )
514 op2.o_tag = LDAP_REQ_BIND;
515 op2.o_req_dn = mi->mi_targets[ candidate ].mt_pseudorootdn;
516 op2.o_req_ndn = mi->mi_targets[ candidate ].mt_pseudorootdn;
517 op2.orb_cred = mi->mi_targets[ candidate ].mt_pseudorootpw;
518 op2.orb_method = LDAP_AUTH_SIMPLE;
520 rc = meta_back_single_bind( &op2, rs, mc, candidate, 0 );
523 rc = meta_back_single_dobind( op, rs, mc, candidate,
524 sendok, mt->mt_nretries, 0 );
529 ldap_pvt_thread_mutex_unlock( &mc->mc_mutex );
533 if ( rc != LDAP_SUCCESS ) {
537 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
539 return rc == LDAP_SUCCESS ? 1 : 0;
543 * callback for unique candidate selection
546 meta_back_conn_cb( Operation *op, SlapReply *rs )
548 assert( op->o_tag == LDAP_REQ_SEARCH );
550 switch ( rs->sr_type ) {
552 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
568 meta_back_get_candidate(
573 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
577 * tries to get a unique candidate
578 * (takes care of default target)
580 candidate = meta_back_select_unique_candidate( mi, ndn );
583 * if any is found, inits the connection
585 if ( candidate == META_TARGET_NONE ) {
586 rs->sr_err = LDAP_NO_SUCH_OBJECT;
587 rs->sr_text = "no suitable candidate target found";
589 } else if ( candidate == META_TARGET_MULTIPLE ) {
592 SlapReply rs2 = { 0 };
593 slap_callback cb2 = { 0 };
596 /* try to get a unique match for the request ndn
597 * among the multiple candidates available */
598 op2.o_tag = LDAP_REQ_SEARCH;
600 op2.o_req_ndn = *ndn;
601 op2.ors_scope = LDAP_SCOPE_BASE;
602 op2.ors_deref = LDAP_DEREF_NEVER;
603 op2.ors_attrs = slap_anlist_no_attrs;
604 op2.ors_attrsonly = 0;
605 op2.ors_limit = NULL;
607 op2.ors_tlimit = SLAP_NO_LIMIT;
609 f.f_choice = LDAP_FILTER_PRESENT;
610 f.f_desc = slap_schema.si_ad_objectClass;
612 BER_BVSTR( &op2.ors_filterstr, "(objectClass=*)" );
614 op2.o_callback = &cb2;
615 cb2.sc_response = meta_back_conn_cb;
616 cb2.sc_private = (void *)&candidate;
618 rc = op->o_bd->be_search( &op2, &rs2 );
620 switch ( rs2.sr_err ) {
623 rs->sr_err = rs2.sr_err;
626 case LDAP_SIZELIMIT_EXCEEDED:
627 /* if multiple candidates can serve the operation,
628 * and a default target is defined, and it is
629 * a candidate, try using it (FIXME: YMMV) */
630 if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
631 && meta_back_is_candidate( &mi->mi_targets[ mi->mi_defaulttarget ].mt_nsuffix,
632 mi->mi_targets[ mi->mi_defaulttarget ].mt_scope,
633 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
635 candidate = mi->mi_defaulttarget;
636 rs->sr_err = LDAP_SUCCESS;
640 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
641 rs->sr_text = "cannot select unique candidate target";
647 rs->sr_err = LDAP_SUCCESS;
653 static void *meta_back_candidates_dummy;
656 meta_back_candidates_keyfree(
660 metacandidates_t *mc = (metacandidates_t *)data;
662 ber_memfree_x( mc->mc_candidates, NULL );
663 ber_memfree_x( data, NULL );
667 meta_back_candidates_get( Operation *op )
669 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
670 metacandidates_t *mc;
672 if ( op->o_threadctx ) {
675 ldap_pvt_thread_pool_getkey( op->o_threadctx,
676 &meta_back_candidates_dummy, &data, NULL );
677 mc = (metacandidates_t *)data;
680 mc = mi->mi_candidates;
684 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
685 mc->mc_ntargets = mi->mi_ntargets;
686 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
687 if ( op->o_threadctx ) {
691 ldap_pvt_thread_pool_setkey( op->o_threadctx,
692 &meta_back_candidates_dummy, data,
693 meta_back_candidates_keyfree );
696 mi->mi_candidates = mc;
699 } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
700 /* NOTE: in the future, may want to allow back-config
701 * to add/remove targets from back-meta... */
702 mc->mc_ntargets = mi->mi_ntargets;
703 mc->mc_candidates = ch_realloc( mc->mc_candidates,
704 sizeof( SlapReply ) * mc->mc_ntargets );
707 return mc->mc_candidates;
713 * Prepares the connection structure
717 * - determine what DN is being requested:
719 * op requires candidate checks
721 * add unique parent of o_req_ndn
722 * bind unique^*[/all] o_req_ndn [no check]
723 * compare unique^+ o_req_ndn
724 * delete unique o_req_ndn
725 * modify unique o_req_ndn
726 * search any o_req_ndn
727 * modrdn unique[, unique] o_req_ndn[, orr_nnewSup]
729 * - for ops that require the candidate to be unique, in case of multiple
730 * occurrences an internal search with sizeLimit=1 is performed
731 * if a unique candidate can actually be determined. If none is found,
732 * the operation aborts; if multiple are found, the default target
733 * is used if defined and candidate; otherwise the operation aborts.
735 * *^note: actually, the bind operation is handled much like a search;
736 * i.e. the bind is broadcast to all candidate targets.
738 * +^note: actually, the compare operation is handled much like a search;
739 * i.e. the compare is broadcast to all candidate targets, while checking
740 * that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
748 ldap_back_send_t sendok )
750 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
751 metaconn_t *mc = NULL,
753 int cached = META_TARGET_NONE,
754 i = META_TARGET_NONE,
760 meta_op_type op_type = META_OP_REQUIRE_SINGLE;
763 struct berval ndn = op->o_req_ndn,
766 SlapReply *candidates = meta_back_candidates_get( op );
768 /* Internal searches are privileged and shared. So is root. */
769 /* FIXME: there seem to be concurrency issues */
770 if ( op->o_do_not_cache || be_isroot( op ) ) {
771 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
772 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
773 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
776 mc_curr.mc_local_ndn = op->o_ndn;
778 /* Explicit binds must not be shared */
779 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
780 mc_curr.mc_conn = op->o_conn;
783 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
787 /* Explicit Bind requests always get their own conn */
788 if ( !( sendok & LDAP_BACK_BINDING ) ) {
789 /* Searches for a metaconn in the avl tree */
791 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
792 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
793 (caddr_t)&mc_curr, meta_back_conn_cmp );
795 if ( mc->mc_tainted ) {
796 rs->sr_err = LDAP_UNAVAILABLE;
797 rs->sr_text = "remote server unavailable";
798 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
802 /* Don't reuse connections while they're still binding */
803 if ( LDAP_BACK_CONN_BINDING( mc ) ) {
804 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
805 ldap_pvt_thread_yield();
810 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
813 switch ( op->o_tag ) {
815 /* if we go to selection, the entry must not exist,
816 * and we must be able to resolve the parent */
818 dnParent( &ndn, &pndn );
821 case LDAP_REQ_MODRDN:
822 /* if nnewSuperior is not NULL, it must resolve
823 * to the same candidate as the req_ndn */
824 if ( op->orr_nnewSup ) {
830 /* if bound as rootdn, the backend must bind to all targets
831 * with the administrative identity */
832 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
833 op_type = META_OP_REQUIRE_ALL;
837 case LDAP_REQ_DELETE:
838 case LDAP_REQ_MODIFY:
839 /* just a unique candidate */
842 case LDAP_REQ_COMPARE:
843 case LDAP_REQ_SEARCH:
844 /* allow multiple candidates for the searchBase */
845 op_type = META_OP_ALLOW_MULTIPLE;
849 /* right now, just break (exop?) */
854 * require all connections ...
856 if ( op_type == META_OP_REQUIRE_ALL ) {
858 /* Looks like we didn't get a bind. Open a new session... */
860 mc = metaconn_alloc( op );
861 mc->mc_conn = mc_curr.mc_conn;
862 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
864 if ( sendok & LDAP_BACK_BINDING ) {
865 LDAP_BACK_CONN_BINDING_SET( mc );
869 for ( i = 0; i < mi->mi_ntargets; i++ ) {
870 metatarget_t *mt = &mi->mi_targets[ i ];
873 * The target is activated; if needed, it is
876 candidates[ i ].sr_err = meta_back_init_one_conn( op,
878 LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok );
879 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
880 candidates[ i ].sr_tag = META_CANDIDATE;
886 * FIXME: in case one target cannot
887 * be init'd, should the other ones
890 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
891 err = candidates[ i ].sr_err;
896 if ( ncandidates == 0 ) {
898 meta_back_freeconn( op, mc );
901 meta_back_release_conn( op, mc );
904 rs->sr_err = LDAP_NO_SUCH_OBJECT;
905 rs->sr_text = "Unable to select valid candidates";
907 if ( sendok & LDAP_BACK_SENDERR ) {
908 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
909 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
911 send_ldap_result( op, rs );
913 rs->sr_matched = NULL;
923 * looks in cache, if any
925 if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
926 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
929 if ( op_type == META_OP_REQUIRE_SINGLE ) {
930 metatarget_t *mt = NULL;
931 metasingleconn_t *msc = NULL;
935 for ( j = 0; j < mi->mi_ntargets; j++ ) {
936 candidates[ j ].sr_tag = META_NOT_CANDIDATE;
940 * tries to get a unique candidate
941 * (takes care of default target)
943 if ( i == META_TARGET_NONE ) {
944 i = meta_back_get_candidate( op, rs, &ndn );
946 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && parent ) {
947 i = meta_back_get_candidate( op, rs, &pndn );
950 if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
952 meta_back_release_conn( op, mc );
955 if ( sendok & LDAP_BACK_SENDERR ) {
956 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
957 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
959 send_ldap_result( op, rs );
961 rs->sr_matched = NULL;
968 if ( newparent && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
971 meta_back_release_conn( op, mc );
974 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
975 rs->sr_text = "cross-target rename not supported";
976 if ( sendok & LDAP_BACK_SENDERR ) {
977 send_ldap_result( op, rs );
984 Debug( LDAP_DEBUG_TRACE,
985 "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
986 i, op->o_req_ndn.bv_val, 0 );
989 /* Retries searching for a metaconn in the avl tree
990 * the reason is that the connection might have been
991 * created by meta_back_get_candidate() */
992 if ( !( sendok & LDAP_BACK_BINDING ) ) {
993 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
994 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
995 (caddr_t)&mc_curr, meta_back_conn_cmp );
999 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1002 /* Looks like we didn't get a bind. Open a new session... */
1004 mc = metaconn_alloc( op );
1005 mc->mc_conn = mc_curr.mc_conn;
1006 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1008 if ( sendok & LDAP_BACK_BINDING ) {
1009 LDAP_BACK_CONN_BINDING_SET( mc );
1015 * Clear all other candidates
1017 ( void )meta_clear_unused_candidates( op, i );
1019 mt = &mi->mi_targets[ i ];
1020 msc = &mc->mc_conns[ i ];
1023 * The target is activated; if needed, it is
1024 * also init'd. In case of error, meta_back_init_one_conn
1025 * sends the appropriate result.
1027 err = meta_back_init_one_conn( op, rs, mt, mc, i,
1028 LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok );
1029 if ( err != LDAP_SUCCESS ) {
1031 * FIXME: in case one target cannot
1032 * be init'd, should the other ones
1035 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
1037 (void)meta_clear_one_candidate( msc );
1038 meta_back_freeconn( op, mc );
1041 meta_back_release_conn( op, mc );
1046 candidates[ i ].sr_err = LDAP_SUCCESS;
1047 candidates[ i ].sr_tag = META_CANDIDATE;
1055 * if no unique candidate ...
1059 /* Looks like we didn't get a bind. Open a new session... */
1061 mc = metaconn_alloc( op );
1062 mc->mc_conn = mc_curr.mc_conn;
1063 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1065 if ( sendok & LDAP_BACK_BINDING ) {
1066 LDAP_BACK_CONN_BINDING_SET( mc );
1070 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1071 metatarget_t *mt = &mi->mi_targets[ i ];
1072 metasingleconn_t *msc = &mc->mc_conns[ i ];
1075 || meta_back_is_candidate( &mt->mt_nsuffix,
1078 LDAP_SCOPE_SUBTREE ) )
1082 * The target is activated; if needed, it is
1085 int lerr = meta_back_init_one_conn( op, rs,
1087 LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1089 if ( lerr == LDAP_SUCCESS ) {
1090 candidates[ i ].sr_tag = META_CANDIDATE;
1091 candidates[ i ].sr_err = LDAP_SUCCESS;
1094 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1095 op->o_log_prefix, i, 0 );
1100 * FIXME: in case one target cannot
1101 * be init'd, should the other ones
1105 ( void )meta_clear_one_candidate( msc );
1107 /* leave the target candidate, but record the error for later use */
1108 candidates[ i ].sr_err = lerr;
1111 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed: %d\n",
1112 op->o_log_prefix, i, lerr );
1119 ( void )meta_clear_one_candidate( msc );
1121 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
1125 if ( ncandidates == 0 ) {
1127 meta_back_freeconn( op, mc );
1130 meta_back_release_conn( op, mc );
1133 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1134 rs->sr_text = "Unable to select valid candidates";
1136 if ( sendok & LDAP_BACK_SENDERR ) {
1137 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1138 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1140 send_ldap_result( op, rs );
1142 rs->sr_matched = NULL;
1150 /* clear out meta_back_init_one_conn non-fatal errors */
1151 rs->sr_err = LDAP_SUCCESS;
1157 * Inserts the newly created metaconn in the avl tree
1159 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1160 err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1161 meta_back_conn_cmp, meta_back_conn_dup );
1163 #if PRINT_CONNTREE > 0
1164 myprint( mi->mi_conninfo.lai_tree );
1165 #endif /* PRINT_CONNTREE */
1167 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1170 * Err could be -1 in case a duplicate metaconn is inserted
1172 * FIXME: what if the same client issues more than one
1173 * asynchronous operations?
1176 Debug( LDAP_DEBUG_ANY,
1177 "%s meta_back_getconn: candidates=%d conn=%ld insert failed\n",
1178 op->o_log_prefix, ncandidates,
1179 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1181 rs->sr_err = LDAP_OTHER;
1182 rs->sr_text = "Internal server error";
1183 meta_back_freeconn( op, mc );
1184 if ( sendok & LDAP_BACK_SENDERR ) {
1185 send_ldap_result( op, rs );
1191 Debug( LDAP_DEBUG_TRACE,
1192 "%s meta_back_getconn: candidates=%d conn=%ld inserted\n",
1193 op->o_log_prefix, ncandidates,
1194 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1197 Debug( LDAP_DEBUG_TRACE,
1198 "%s meta_back_getconn: candidates=%d conn=%ld fetched\n",
1199 op->o_log_prefix, ncandidates,
1200 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1207 meta_back_release_conn(
1211 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
1213 assert( mc != NULL );
1215 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1216 assert( mc->mc_refcnt > 0 );
1218 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1219 if ( mc->mc_refcnt == 0 && mc->mc_tainted ) {
1220 (void)avl_delete( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1221 meta_back_conn_cmp );
1222 meta_back_conn_free( mc );
1224 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );