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
43 * meta_back_conndn_cmp
45 * compares two struct metaconn based on the value of the conn pointer
46 * and of the local DN; used by avl stuff
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 /* For shared sessions, conn is NULL. Only explicitly
59 * bound sessions will have non-NULL conn.
61 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
63 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
70 * meta_back_conndnmc_cmp
72 * compares two struct metaconn based on the value of the conn pointer,
73 * the local DN and the struct pointer; used by avl stuff
76 meta_back_conndnmc_cmp(
80 metaconn_t *mc1 = ( metaconn_t * )c1;
81 metaconn_t *mc2 = ( metaconn_t * )c2;
84 /* If local DNs don't match, it is definitely not a match */
85 /* For shared sessions, conn is NULL. Only explicitly
86 * bound sessions will have non-NULL conn.
88 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
90 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
92 rc = SLAP_PTRCMP( mc1, mc2 );
102 * compares two struct metaconn based on the value of the conn pointer;
110 metaconn_t *mc1 = ( metaconn_t * )c1;
111 metaconn_t *mc2 = ( metaconn_t * )c2;
113 /* For shared sessions, conn is NULL. Only explicitly
114 * bound sessions will have non-NULL conn.
116 return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
120 * meta_back_conndn_dup
122 * returns -1 in case a duplicate struct metaconn has been inserted;
126 meta_back_conndn_dup(
130 metaconn_t *mc1 = ( metaconn_t * )c1;
131 metaconn_t *mc2 = ( metaconn_t * )c2;
133 /* Cannot have more than one shared session with same DN */
134 if ( mc1->mc_conn == mc2->mc_conn &&
135 dn_match( &mc1->mc_local_ndn, &mc2->mc_local_ndn ) )
144 * Debug stuff (got it from libavl)
146 #if PRINT_CONNTREE > 0
148 ravl_print( Avlnode *root, int depth )
151 metaconn_t *mc = (metaconn_t *)root->avl_data;
157 ravl_print( root->avl_right, depth + 1 );
159 for ( i = 0; i < depth; i++ ) {
163 printf( "c(%d%s%s) %d\n",
164 LDAP_BACK_PCONN_ID( mc->mc_conn ),
165 BER_BVISNULL( &mc->mc_local_ndn ) ? "" : ": ",
166 BER_BVISNULL( &mc->mc_local_ndn ) ? "" : mc->mc_local_ndn.bv_val,
169 ravl_print( root->avl_left, depth + 1 );
173 myprint( Avlnode *root )
175 printf( "********\n" );
178 printf( "\tNULL\n" );
180 ravl_print( root, 0 );
183 printf( "********\n" );
185 #endif /* PRINT_CONNTREE */
193 * Allocates a connection structure, making room for all the referenced targets
199 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
201 int i, ntargets = mi->mi_ntargets;
203 assert( ntargets > 0 );
205 /* malloc all in one */
206 mc = ( metaconn_t * )ch_malloc( sizeof( metaconn_t )
207 + sizeof( metasingleconn_t ) * ntargets );
212 for ( i = 0; i < ntargets; i++ ) {
213 mc->mc_conns[ i ].msc_ld = NULL;
214 BER_BVZERO( &mc->mc_conns[ i ].msc_bound_ndn );
215 BER_BVZERO( &mc->mc_conns[ i ].msc_cred );
216 mc->mc_conns[ i ].msc_mscflags = 0;
217 mc->mc_conns[ i ].msc_info = mi;
220 BER_BVZERO( &mc->mc_local_ndn );
221 mc->msc_mscflags = 0;
222 mc->mc_authz_target = META_BOUND_NONE;
233 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
235 assert( mc != NULL );
237 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
239 if ( --mc->mc_refcnt == 0 ) {
240 meta_back_conn_free( mc );
243 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
247 * meta_back_init_one_conn
249 * Initializes one connection
252 meta_back_init_one_conn(
259 ldap_back_send_t sendok )
261 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
262 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
265 int isauthz = ( candidate == mc->mc_authz_target );
270 if ( msc->msc_ld != NULL ) {
271 return rs->sr_err = LDAP_SUCCESS;
274 msc->msc_mscflags = 0;
277 * Attempts to initialize the connection to the target ds
279 rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
280 if ( rs->sr_err != LDAP_SUCCESS ) {
285 * Set LDAP version. This will always succeed: If the client
286 * bound with a particular version, then so can we.
288 vers = op->o_conn->c_protocol;
289 ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &vers );
291 /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
292 ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
293 LDAP_BACK_CHASE_REFERRALS( mi ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
296 /* start TLS ("tls [try-]{start|propagate}" statement) */
297 if ( ( LDAP_BACK_USE_TLS( mi ) || ( op->o_conn->c_is_tls && LDAP_BACK_PROPAGATE_TLS( mi ) ) )
298 && !ldap_is_ldaps_url( mt->mt_uri ) )
300 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
302 * use asynchronous StartTLS; in case, chase referral
303 * FIXME: OpenLDAP does not return referral on StartTLS yet
307 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
308 if ( rs->sr_err == LDAP_SUCCESS ) {
309 LDAPMessage *res = NULL;
310 int rc, nretries = mt->mt_nretries;
313 LDAP_BACK_TV_SET( &tv );
316 rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
318 rs->sr_err = LDAP_OTHER;
320 } else if ( rc == 0 ) {
321 if ( nretries != 0 ) {
322 if ( nretries > 0 ) {
325 LDAP_BACK_TV_SET( &tv );
328 rs->sr_err = LDAP_OTHER;
330 } else if ( rc == LDAP_RES_EXTENDED ) {
331 struct berval *data = NULL;
333 rs->sr_err = ldap_parse_extended_result( msc->msc_ld, res,
335 if ( rs->sr_err == LDAP_SUCCESS ) {
338 rs->sr_err = ldap_parse_result( msc->msc_ld, res,
339 &err, NULL, NULL, NULL, NULL, 1 );
342 if ( rs->sr_err == LDAP_SUCCESS ) {
346 /* FIXME: in case a referral
347 * is returned, should we try
348 * using it instead of the
350 if ( rs->sr_err == LDAP_SUCCESS ) {
351 ldap_install_tls( msc->msc_ld );
353 } else if ( rs->sr_err == LDAP_REFERRAL ) {
354 rs->sr_err = LDAP_OTHER;
355 rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
359 if ( data->bv_val ) {
360 ber_memfree( data->bv_val );
367 rs->sr_err = LDAP_OTHER;
374 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
376 * use synchronous StartTLS
378 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
379 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
381 /* if StartTLS is requested, only attempt it if the URL
382 * is not "ldaps://"; this may occur not only in case
383 * of misconfiguration, but also when used in the chain
384 * overlay, where the "uri" can be parsed out of a referral */
385 if ( rs->sr_err == LDAP_SERVER_DOWN
386 || ( rs->sr_err != LDAP_SUCCESS && LDAP_BACK_TLS_CRITICAL( mi ) ) )
388 ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
392 #endif /* HAVE_TLS */
395 * Set the network timeout if set
397 if ( mt->mt_network_timeout != 0 ) {
398 struct timeval network_timeout;
400 network_timeout.tv_usec = 0;
401 network_timeout.tv_sec = mt->mt_network_timeout;
403 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
404 (void *)&network_timeout );
408 * If the connection DN is not null, an attempt to rewrite it is made
412 if ( !BER_BVISNULL( &mt->mt_pseudorootdn ) ) {
413 ber_dupbv( &msc->msc_bound_ndn, &mt->mt_pseudorootdn );
414 if ( !BER_BVISNULL( &mt->mt_pseudorootpw ) ) {
415 ber_dupbv( &msc->msc_cred, &mt->mt_pseudorootpw );
419 ber_str2bv( "", 0, 1, &msc->msc_bound_ndn );
422 LDAP_BACK_CONN_ISPRIV_SET( msc );
425 BER_BVZERO( &msc->msc_cred );
426 BER_BVZERO( &msc->msc_bound_ndn );
427 if ( !BER_BVISEMPTY( &op->o_ndn )
428 && SLAP_IS_AUTHZ_BACKEND( op )
432 dc.conn = op->o_conn;
437 * Rewrite the bind dn if needed
439 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
440 &msc->msc_bound_ndn ) )
442 ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
446 /* copy the DN idf needed */
447 if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
448 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
452 ber_str2bv( "", 0, 1, &msc->msc_bound_ndn );
456 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
459 if ( rs->sr_err == LDAP_SUCCESS ) {
461 * Sets a cookie for the rewrite session
463 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
466 rs->sr_err = slap_map_api2result( rs );
467 if ( sendok & LDAP_BACK_SENDERR ) {
468 send_ldap_result( op, rs );
479 * Retries one connection
487 ldap_back_send_t sendok )
489 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
490 metatarget_t *mt = &mi->mi_targets[ candidate ];
491 int rc = LDAP_UNAVAILABLE;
492 metaconn_t *mc = *mcp;
493 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
495 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
497 assert( mc->mc_refcnt > 0 );
498 if ( mc->mc_refcnt == 1 ) {
499 char buf[ SLAP_TEXT_BUFLEN ];
501 snprintf( buf, sizeof( buf ),
502 "retrying URI=\"%s\" DN=\"%s\"",
504 BER_BVISNULL( &msc->msc_bound_ndn ) ?
505 "" : msc->msc_bound_ndn.bv_val );
506 Debug( LDAP_DEBUG_ANY,
507 "%s meta_back_retry[%d]: %s.\n",
508 op->o_log_prefix, candidate, buf );
510 meta_clear_one_candidate( msc );
511 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
513 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
515 /* mc here must be the regular mc, reset and ready for init */
516 rc = meta_back_init_one_conn( op, rs, mt, mc, candidate,
517 LDAP_BACK_CONN_ISPRIV( mc ), sendok );
519 if ( rc == LDAP_SUCCESS ) {
520 rc = meta_back_single_dobind( op, rs, mcp, candidate,
521 sendok, mt->mt_nretries, 0 );
525 if ( rc != LDAP_SUCCESS ) {
526 if ( *mcp != NULL ) {
527 meta_back_release_conn_lock( op, mc, 1, 0 );
532 rs->sr_err = LDAP_UNAVAILABLE;
534 send_ldap_result( op, rs );
538 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
540 return rc == LDAP_SUCCESS ? 1 : 0;
544 * callback for unique candidate selection
547 meta_back_conn_cb( Operation *op, SlapReply *rs )
549 assert( op->o_tag == LDAP_REQ_SEARCH );
551 switch ( rs->sr_type ) {
553 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
569 meta_back_get_candidate(
574 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
578 * tries to get a unique candidate
579 * (takes care of default target)
581 candidate = meta_back_select_unique_candidate( mi, ndn );
584 * if any is found, inits the connection
586 if ( candidate == META_TARGET_NONE ) {
587 rs->sr_err = LDAP_NO_SUCH_OBJECT;
588 rs->sr_text = "no suitable candidate target found";
590 } else if ( candidate == META_TARGET_MULTIPLE ) {
593 SlapReply rs2 = { 0 };
594 slap_callback cb2 = { 0 };
597 /* try to get a unique match for the request ndn
598 * among the multiple candidates available */
599 op2.o_tag = LDAP_REQ_SEARCH;
601 op2.o_req_ndn = *ndn;
602 op2.ors_scope = LDAP_SCOPE_BASE;
603 op2.ors_deref = LDAP_DEREF_NEVER;
604 op2.ors_attrs = slap_anlist_no_attrs;
605 op2.ors_attrsonly = 0;
606 op2.ors_limit = NULL;
608 op2.ors_tlimit = SLAP_NO_LIMIT;
610 f.f_choice = LDAP_FILTER_PRESENT;
611 f.f_desc = slap_schema.si_ad_objectClass;
613 BER_BVSTR( &op2.ors_filterstr, "(objectClass=*)" );
615 op2.o_callback = &cb2;
616 cb2.sc_response = meta_back_conn_cb;
617 cb2.sc_private = (void *)&candidate;
619 rc = op->o_bd->be_search( &op2, &rs2 );
621 switch ( rs2.sr_err ) {
624 rs->sr_err = rs2.sr_err;
627 case LDAP_SIZELIMIT_EXCEEDED:
628 /* if multiple candidates can serve the operation,
629 * and a default target is defined, and it is
630 * a candidate, try using it (FIXME: YMMV) */
631 if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
632 && meta_back_is_candidate( &mi->mi_targets[ mi->mi_defaulttarget ].mt_nsuffix,
633 mi->mi_targets[ mi->mi_defaulttarget ].mt_scope,
634 mi->mi_targets[ mi->mi_defaulttarget ].mt_subtree_exclude,
635 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
637 candidate = mi->mi_defaulttarget;
638 rs->sr_err = LDAP_SUCCESS;
642 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
643 rs->sr_text = "cannot select unique candidate target";
649 rs->sr_err = LDAP_SUCCESS;
655 static void *meta_back_candidates_dummy;
658 meta_back_candidates_keyfree(
662 metacandidates_t *mc = (metacandidates_t *)data;
664 ber_memfree_x( mc->mc_candidates, NULL );
665 ber_memfree_x( data, NULL );
669 meta_back_candidates_get( Operation *op )
671 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
672 metacandidates_t *mc;
674 if ( op->o_threadctx ) {
677 ldap_pvt_thread_pool_getkey( op->o_threadctx,
678 &meta_back_candidates_dummy, &data, NULL );
679 mc = (metacandidates_t *)data;
682 mc = mi->mi_candidates;
686 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
687 mc->mc_ntargets = mi->mi_ntargets;
688 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
689 if ( op->o_threadctx ) {
693 ldap_pvt_thread_pool_setkey( op->o_threadctx,
694 &meta_back_candidates_dummy, data,
695 meta_back_candidates_keyfree );
698 mi->mi_candidates = mc;
701 } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
702 /* NOTE: in the future, may want to allow back-config
703 * to add/remove targets from back-meta... */
704 mc->mc_ntargets = mi->mi_ntargets;
705 mc->mc_candidates = ch_realloc( mc->mc_candidates,
706 sizeof( SlapReply ) * mc->mc_ntargets );
709 return mc->mc_candidates;
715 * Prepares the connection structure
719 * - determine what DN is being requested:
721 * op requires candidate checks
723 * add unique parent of o_req_ndn
724 * bind unique^*[/all] o_req_ndn [no check]
725 * compare unique^+ o_req_ndn
726 * delete unique o_req_ndn
727 * modify unique o_req_ndn
728 * search any o_req_ndn
729 * modrdn unique[, unique] o_req_ndn[, orr_nnewSup]
731 * - for ops that require the candidate to be unique, in case of multiple
732 * occurrences an internal search with sizeLimit=1 is performed
733 * if a unique candidate can actually be determined. If none is found,
734 * the operation aborts; if multiple are found, the default target
735 * is used if defined and candidate; otherwise the operation aborts.
737 * *^note: actually, the bind operation is handled much like a search;
738 * i.e. the bind is broadcast to all candidate targets.
740 * +^note: actually, the compare operation is handled much like a search;
741 * i.e. the compare is broadcast to all candidate targets, while checking
742 * that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
750 ldap_back_send_t sendok )
752 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
753 metaconn_t *mc = NULL,
755 int cached = META_TARGET_NONE,
756 i = META_TARGET_NONE,
762 meta_op_type op_type = META_OP_REQUIRE_SINGLE;
766 META_DNTYPE_NEWPARENT
767 } dn_type = META_DNTYPE_ENTRY;
768 struct berval ndn = op->o_req_ndn,
771 SlapReply *candidates = meta_back_candidates_get( op );
773 /* Internal searches are privileged and shared. So is root. */
774 /* FIXME: there seem to be concurrency issues */
775 if ( op->o_do_not_cache || be_isroot( op ) ) {
776 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
777 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
778 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
781 mc_curr.mc_local_ndn = op->o_ndn;
783 /* Explicit binds must not be shared */
784 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
785 mc_curr.mc_conn = op->o_conn;
788 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
792 /* Explicit Bind requests always get their own conn */
793 if ( !( sendok & LDAP_BACK_BINDING ) ) {
794 /* Searches for a metaconn in the avl tree */
796 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
797 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
798 (caddr_t)&mc_curr, meta_back_conndn_cmp );
800 if ( ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
801 || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
803 /* don't let anyone else use this expired connection */
804 (void)avl_delete( &mi->mi_conninfo.lai_tree,
805 (caddr_t)mc, meta_back_conndnmc_cmp );
807 Debug( LDAP_DEBUG_TRACE, "%s meta_back_getconn: mc=%p conn=%ld expired.\n",
808 op->o_log_prefix, (void *)mc, LDAP_BACK_PCONN_ID( mc->mc_conn ) );
811 /* Don't reuse connections while they're still binding */
812 if ( LDAP_BACK_CONN_BINDING( mc ) ) {
813 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
814 ldap_pvt_thread_yield();
820 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
823 switch ( op->o_tag ) {
825 /* if we go to selection, the entry must not exist,
826 * and we must be able to resolve the parent */
827 dn_type = META_DNTYPE_PARENT;
828 dnParent( &ndn, &pndn );
831 case LDAP_REQ_MODRDN:
832 /* if nnewSuperior is not NULL, it must resolve
833 * to the same candidate as the req_ndn */
834 if ( op->orr_nnewSup ) {
835 dn_type = META_DNTYPE_NEWPARENT;
840 /* if bound as rootdn, the backend must bind to all targets
841 * with the administrative identity */
842 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
843 op_type = META_OP_REQUIRE_ALL;
847 case LDAP_REQ_DELETE:
848 case LDAP_REQ_MODIFY:
849 /* just a unique candidate */
852 case LDAP_REQ_COMPARE:
853 case LDAP_REQ_SEARCH:
854 /* allow multiple candidates for the searchBase */
855 op_type = META_OP_ALLOW_MULTIPLE;
859 /* right now, just break (exop?) */
864 * require all connections ...
866 if ( op_type == META_OP_REQUIRE_ALL ) {
868 /* Looks like we didn't get a bind. Open a new session... */
870 mc = metaconn_alloc( op );
871 mc->mc_conn = mc_curr.mc_conn;
872 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
874 if ( sendok & LDAP_BACK_BINDING ) {
875 LDAP_BACK_CONN_BINDING_SET( mc );
879 for ( i = 0; i < mi->mi_ntargets; i++ ) {
880 metatarget_t *mt = &mi->mi_targets[ i ];
883 * The target is activated; if needed, it is
886 candidates[ i ].sr_err = meta_back_init_one_conn( op,
888 LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok );
889 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
890 candidates[ i ].sr_tag = META_CANDIDATE;
896 * FIXME: in case one target cannot
897 * be init'd, should the other ones
900 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
901 err = candidates[ i ].sr_err;
906 if ( ncandidates == 0 ) {
908 meta_back_freeconn( op, mc );
911 meta_back_release_conn( op, mc );
914 rs->sr_err = LDAP_NO_SUCH_OBJECT;
915 rs->sr_text = "Unable to select valid candidates";
917 if ( sendok & LDAP_BACK_SENDERR ) {
918 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
919 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
921 send_ldap_result( op, rs );
923 rs->sr_matched = NULL;
933 * looks in cache, if any
935 if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
936 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
939 if ( op_type == META_OP_REQUIRE_SINGLE ) {
940 metatarget_t *mt = NULL;
941 metasingleconn_t *msc = NULL;
945 for ( j = 0; j < mi->mi_ntargets; j++ ) {
946 candidates[ j ].sr_tag = META_NOT_CANDIDATE;
950 * tries to get a unique candidate
951 * (takes care of default target)
953 if ( i == META_TARGET_NONE ) {
954 i = meta_back_get_candidate( op, rs, &ndn );
956 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
957 i = meta_back_get_candidate( op, rs, &pndn );
960 if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
962 meta_back_release_conn( op, mc );
965 if ( sendok & LDAP_BACK_SENDERR ) {
966 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
967 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
969 send_ldap_result( op, rs );
971 rs->sr_matched = NULL;
978 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
981 meta_back_release_conn( op, mc );
984 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
985 rs->sr_text = "cross-target rename not supported";
986 if ( sendok & LDAP_BACK_SENDERR ) {
987 send_ldap_result( op, rs );
994 Debug( LDAP_DEBUG_TRACE,
995 "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
996 i, op->o_req_ndn.bv_val, 0 );
999 /* Retries searching for a metaconn in the avl tree
1000 * the reason is that the connection might have been
1001 * created by meta_back_get_candidate() */
1002 if ( !( sendok & LDAP_BACK_BINDING ) ) {
1004 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1005 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1006 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1008 /* Don't reuse connections while they're still binding */
1009 if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1010 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1011 ldap_pvt_thread_yield();
1017 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1020 /* Looks like we didn't get a bind. Open a new session... */
1022 mc = metaconn_alloc( op );
1023 mc->mc_conn = mc_curr.mc_conn;
1024 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1026 if ( sendok & LDAP_BACK_BINDING ) {
1027 LDAP_BACK_CONN_BINDING_SET( mc );
1033 * Clear all other candidates
1035 ( void )meta_clear_unused_candidates( op, i );
1037 mt = &mi->mi_targets[ i ];
1038 msc = &mc->mc_conns[ i ];
1041 * The target is activated; if needed, it is
1042 * also init'd. In case of error, meta_back_init_one_conn
1043 * sends the appropriate result.
1045 err = meta_back_init_one_conn( op, rs, mt, mc, i,
1046 LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok );
1047 if ( err != LDAP_SUCCESS ) {
1049 * FIXME: in case one target cannot
1050 * be init'd, should the other ones
1053 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
1055 (void)meta_clear_one_candidate( msc );
1056 meta_back_freeconn( op, mc );
1059 meta_back_release_conn( op, mc );
1064 candidates[ i ].sr_err = LDAP_SUCCESS;
1065 candidates[ i ].sr_tag = META_CANDIDATE;
1073 * if no unique candidate ...
1077 /* Looks like we didn't get a bind. Open a new session... */
1079 mc = metaconn_alloc( op );
1080 mc->mc_conn = mc_curr.mc_conn;
1081 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1083 if ( sendok & LDAP_BACK_BINDING ) {
1084 LDAP_BACK_CONN_BINDING_SET( mc );
1088 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1089 metatarget_t *mt = &mi->mi_targets[ i ];
1090 metasingleconn_t *msc = &mc->mc_conns[ i ];
1093 || meta_back_is_candidate( &mt->mt_nsuffix,
1095 mt->mt_subtree_exclude,
1097 LDAP_SCOPE_SUBTREE ) )
1101 * The target is activated; if needed, it is
1104 int lerr = meta_back_init_one_conn( op, rs,
1106 LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1108 if ( lerr == LDAP_SUCCESS ) {
1109 candidates[ i ].sr_tag = META_CANDIDATE;
1110 candidates[ i ].sr_err = LDAP_SUCCESS;
1113 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1114 op->o_log_prefix, i, 0 );
1119 * FIXME: in case one target cannot
1120 * be init'd, should the other ones
1124 ( void )meta_clear_one_candidate( msc );
1126 /* leave the target candidate, but record the error for later use */
1127 candidates[ i ].sr_err = lerr;
1130 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed: %d\n",
1131 op->o_log_prefix, i, lerr );
1138 ( void )meta_clear_one_candidate( msc );
1140 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
1144 if ( ncandidates == 0 ) {
1146 meta_back_freeconn( op, mc );
1149 meta_back_release_conn( op, mc );
1152 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1153 rs->sr_text = "Unable to select valid candidates";
1155 if ( sendok & LDAP_BACK_SENDERR ) {
1156 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1157 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1159 send_ldap_result( op, rs );
1161 rs->sr_matched = NULL;
1169 /* clear out meta_back_init_one_conn non-fatal errors */
1170 rs->sr_err = LDAP_SUCCESS;
1173 /* touch the timestamp */
1174 if ( mi->mi_idle_timeout != 0 ) {
1175 mc->mc_time = op->o_time;
1180 if ( mi->mi_conn_ttl ) {
1181 mc->mc_create_time = op->o_time;
1185 * Inserts the newly created metaconn in the avl tree
1187 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1188 err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1189 meta_back_conndn_cmp, meta_back_conndn_dup );
1191 #if PRINT_CONNTREE > 0
1192 myprint( mi->mi_conninfo.lai_tree );
1193 #endif /* PRINT_CONNTREE */
1195 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1198 * Err could be -1 in case a duplicate metaconn is inserted
1200 * FIXME: what if the same client issues more than one
1201 * asynchronous operations?
1204 Debug( LDAP_DEBUG_ANY,
1205 "%s meta_back_getconn: candidates=%d conn=%ld insert failed\n",
1206 op->o_log_prefix, ncandidates,
1207 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1209 rs->sr_err = LDAP_OTHER;
1210 rs->sr_text = "Internal server error";
1211 meta_back_freeconn( op, mc );
1212 if ( sendok & LDAP_BACK_SENDERR ) {
1213 send_ldap_result( op, rs );
1219 Debug( LDAP_DEBUG_TRACE,
1220 "%s meta_back_getconn: candidates=%d conn=%ld inserted\n",
1221 op->o_log_prefix, ncandidates,
1222 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1225 Debug( LDAP_DEBUG_TRACE,
1226 "%s meta_back_getconn: candidates=%d conn=%ld fetched\n",
1227 op->o_log_prefix, ncandidates,
1228 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1235 meta_back_release_conn_lock(
1241 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
1243 assert( mc != NULL );
1246 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1248 assert( mc->mc_refcnt > 0 );
1250 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1252 || ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1253 || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
1255 Debug( LDAP_DEBUG_TRACE, "%s meta_back_release_conn: mc=%p conn=%ld expired.\n",
1256 op->o_log_prefix, (void *)mc, LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1257 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1258 ( caddr_t )mc, meta_back_conndnmc_cmp );
1259 if ( mc->mc_refcnt == 0 ) {
1260 meta_clear_candidates( op, mc );
1261 meta_back_conn_free( mc );
1265 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );