2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 * Copyright 1999-2005 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(
209 metasingleconn_t *msc,
212 ldap_back_send_t sendok )
214 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
221 if ( msc->msc_ld != NULL ) {
222 return rs->sr_err = LDAP_SUCCESS;
226 * Attempts to initialize the connection to the target ds
228 rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
229 if ( rs->sr_err != LDAP_SUCCESS ) {
234 * Set LDAP version. This will always succeed: If the client
235 * bound with a particular version, then so can we.
237 vers = op->o_conn->c_protocol;
238 ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &vers );
240 /* automatically chase referrals ("chase-referrals"/"dont-chase-referrals" statement) */
241 if ( LDAP_BACK_CHASE_REFERRALS( mi ) ) {
242 ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
246 /* start TLS ("tls [try-]{start|propagate}" statement) */
247 if ( ( LDAP_BACK_USE_TLS( mi ) || ( op->o_conn->c_is_tls && LDAP_BACK_PROPAGATE_TLS( mi ) ) )
248 && !ldap_is_ldaps_url( mt->mt_uri ) )
250 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
252 * use asynchronous StartTLS; in case, chase referral
253 * FIXME: OpenLDAP does not return referral on StartTLS yet
257 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
258 if ( rs->sr_err == LDAP_SUCCESS ) {
259 LDAPMessage *res = NULL;
260 int rc, nretries = mt->mt_nretries;
263 LDAP_BACK_TV_SET( &tv );
266 rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
268 rs->sr_err = LDAP_OTHER;
270 } else if ( rc == 0 ) {
271 if ( nretries != 0 ) {
272 if ( nretries > 0 ) {
275 LDAP_BACK_TV_SET( &tv );
278 rs->sr_err = LDAP_OTHER;
280 } else if ( rc == LDAP_RES_EXTENDED ) {
281 struct berval *data = NULL;
283 rs->sr_err = ldap_parse_extended_result( msc->msc_ld, res,
285 if ( rs->sr_err == LDAP_SUCCESS ) {
288 rs->sr_err = ldap_parse_result( msc->msc_ld, res,
289 &err, NULL, NULL, NULL, NULL, 1 );
292 if ( rs->sr_err == LDAP_SUCCESS ) {
296 /* FIXME: in case a referral
297 * is returned, should we try
298 * using it instead of the
300 if ( rs->sr_err == LDAP_SUCCESS ) {
301 ldap_install_tls( msc->msc_ld );
303 } else if ( rs->sr_err == LDAP_REFERRAL ) {
304 rs->sr_err = LDAP_OTHER;
305 rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
309 if ( data->bv_val ) {
310 ber_memfree( data->bv_val );
317 rs->sr_err = LDAP_OTHER;
324 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
326 * use synchronous StartTLS
328 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
329 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
331 /* if StartTLS is requested, only attempt it if the URL
332 * is not "ldaps://"; this may occur not only in case
333 * of misconfiguration, but also when used in the chain
334 * overlay, where the "uri" can be parsed out of a referral */
335 if ( rs->sr_err == LDAP_SERVER_DOWN
336 || ( rs->sr_err != LDAP_SUCCESS && LDAP_BACK_TLS_CRITICAL( mi ) ) )
338 ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
342 #endif /* HAVE_TLS */
345 * Set the network timeout if set
347 if ( mi->mi_network_timeout != 0 ) {
348 struct timeval network_timeout;
350 network_timeout.tv_usec = 0;
351 network_timeout.tv_sec = mi->mi_network_timeout;
353 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
354 (void *)&network_timeout );
358 * If the connection DN is not null, an attempt to rewrite it is made
362 if ( !BER_BVISNULL( &mt->mt_pseudorootdn ) ) {
363 ber_dupbv( &msc->msc_bound_ndn, &mt->mt_pseudorootdn );
364 if ( !BER_BVISNULL( &mt->mt_pseudorootpw ) ) {
365 ber_dupbv( &msc->msc_cred, &mt->mt_pseudorootpw );
369 ber_str2bv( "", 0, 1, &msc->msc_bound_ndn );
372 LDAP_BACK_CONN_ISPRIV_SET( msc );
375 BER_BVZERO( &msc->msc_cred );
376 BER_BVZERO( &msc->msc_bound_ndn );
377 if ( !BER_BVISEMPTY( &op->o_ndn )
378 && SLAP_IS_AUTHZ_BACKEND( op )
382 dc.conn = op->o_conn;
387 * Rewrite the bind dn if needed
389 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
390 &msc->msc_bound_ndn ) )
392 ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
396 /* copy the DN idf needed */
397 if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
398 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
402 ber_str2bv( "", 0, 1, &msc->msc_bound_ndn );
406 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
408 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
411 if ( rs->sr_err == LDAP_SUCCESS ) {
413 * Sets a cookie for the rewrite session
415 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
418 rs->sr_err = slap_map_api2result( rs );
419 if ( sendok & LDAP_BACK_SENDERR ) {
420 send_ldap_result( op, rs );
431 * Retries one connection
439 ldap_back_send_t sendok )
441 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
442 metatarget_t *mt = &mi->mi_targets[ candidate ];
443 int rc = LDAP_UNAVAILABLE;
444 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
447 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
449 assert( mc->mc_refcnt > 0 );
451 if ( mc->mc_refcnt == 1 ) {
452 while ( ldap_pvt_thread_mutex_trylock( &mc->mc_mutex ) ) {
453 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
454 ldap_pvt_thread_yield();
458 Debug( LDAP_DEBUG_ANY,
459 "%s meta_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
460 op->o_log_prefix, mt->mt_uri,
461 BER_BVISNULL( &msc->msc_bound_ndn ) ?
462 "" : msc->msc_bound_ndn.bv_val );
464 meta_clear_one_candidate( msc );
465 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
467 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
469 /* mc here must be the regular mc, reset and ready for init */
470 rc = meta_back_init_one_conn( op, rs, mt, mc, msc,
471 LDAP_BACK_CONN_ISPRIV( mc ),
472 candidate == mc->mc_authz_target, sendok );
474 if ( rc == LDAP_SUCCESS ) {
475 rc = meta_back_single_dobind( op, rs, mc, candidate,
476 sendok, mt->mt_nretries, 0 );
479 ldap_pvt_thread_mutex_unlock( &mc->mc_mutex );
482 if ( rc != LDAP_SUCCESS ) {
486 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
488 return rc == LDAP_SUCCESS ? 1 : 0;
492 * callback for unique candidate selection
495 meta_back_conn_cb( Operation *op, SlapReply *rs )
497 assert( op->o_tag == LDAP_REQ_SEARCH );
499 switch ( rs->sr_type ) {
501 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
517 meta_back_get_candidate(
522 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
526 * tries to get a unique candidate
527 * (takes care of default target)
529 candidate = meta_back_select_unique_candidate( mi, ndn );
532 * if any is found, inits the connection
534 if ( candidate == META_TARGET_NONE ) {
535 rs->sr_err = LDAP_NO_SUCH_OBJECT;
536 rs->sr_text = "no suitable candidate target found";
538 } else if ( candidate == META_TARGET_MULTIPLE ) {
541 SlapReply rs2 = { 0 };
542 slap_callback cb2 = { 0 };
545 /* try to get a unique match for the request ndn
546 * among the multiple candidates available */
547 op2.o_tag = LDAP_REQ_SEARCH;
549 op2.o_req_ndn = *ndn;
550 op2.ors_scope = LDAP_SCOPE_BASE;
551 op2.ors_deref = LDAP_DEREF_NEVER;
552 op2.ors_attrs = slap_anlist_no_attrs;
553 op2.ors_attrsonly = 0;
554 op2.ors_limit = NULL;
556 op2.ors_tlimit = SLAP_NO_LIMIT;
558 f.f_choice = LDAP_FILTER_PRESENT;
559 f.f_desc = slap_schema.si_ad_objectClass;
561 BER_BVSTR( &op2.ors_filterstr, "(objectClass=*)" );
563 op2.o_callback = &cb2;
564 cb2.sc_response = meta_back_conn_cb;
565 cb2.sc_private = (void *)&candidate;
567 rc = op->o_bd->be_search( &op2, &rs2 );
569 switch ( rs2.sr_err ) {
572 rs->sr_err = rs2.sr_err;
575 case LDAP_SIZELIMIT_EXCEEDED:
576 /* if multiple candidates can serve the operation,
577 * and a default target is defined, and it is
578 * a candidate, try using it (FIXME: YMMV) */
579 if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
580 && meta_back_is_candidate( &mi->mi_targets[ mi->mi_defaulttarget ].mt_nsuffix,
581 mi->mi_targets[ mi->mi_defaulttarget ].mt_scope,
582 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
584 candidate = mi->mi_defaulttarget;
585 rs->sr_err = LDAP_SUCCESS;
589 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
590 rs->sr_text = "cannot select unique candidate target";
596 rs->sr_err = LDAP_SUCCESS;
602 static void *meta_back_candidates_dummy;
605 meta_back_candidates_keyfree(
609 metacandidates_t *mc = (metacandidates_t *)data;
611 ber_memfree_x( mc->mc_candidates, NULL );
612 ber_memfree_x( data, NULL );
616 meta_back_candidates_get( Operation *op )
618 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
619 metacandidates_t *mc;
621 if ( op->o_threadctx ) {
624 ldap_pvt_thread_pool_getkey( op->o_threadctx,
625 &meta_back_candidates_dummy, &data, NULL );
626 mc = (metacandidates_t *)data;
629 mc = mi->mi_candidates;
633 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
634 mc->mc_ntargets = mi->mi_ntargets;
635 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
636 if ( op->o_threadctx ) {
640 ldap_pvt_thread_pool_setkey( op->o_threadctx,
641 &meta_back_candidates_dummy, data,
642 meta_back_candidates_keyfree );
645 mi->mi_candidates = mc;
648 } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
649 /* NOTE: in the future, may want to allow back-config
650 * to add/remove targets from back-meta... */
651 mc->mc_ntargets = mi->mi_ntargets;
652 mc->mc_candidates = ch_realloc( mc->mc_candidates,
653 sizeof( SlapReply ) * mc->mc_ntargets );
656 return mc->mc_candidates;
662 * Prepares the connection structure
666 * - determine what DN is being requested:
668 * op requires candidate checks
670 * add unique parent of o_req_ndn
671 * bind unique^*[/all] o_req_ndn [no check]
672 * compare unique^+ o_req_ndn
673 * delete unique o_req_ndn
674 * modify unique o_req_ndn
675 * search any o_req_ndn
676 * modrdn unique[, unique] o_req_ndn[, orr_nnewSup]
678 * - for ops that require the candidate to be unique, in case of multiple
679 * occurrences an internal search with sizeLimit=1 is performed
680 * if a unique candidate can actually be determined. If none is found,
681 * the operation aborts; if multiple are found, the default target
682 * is used if defined and candidate; otherwise the operation aborts.
684 * *^note: actually, the bind operation is handled much like a search;
685 * i.e. the bind is broadcast to all candidate targets.
687 * +^note: actually, the compare operation is handled much like a search;
688 * i.e. the compare is broadcast to all candidate targets, while checking
689 * that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
697 ldap_back_send_t sendok )
699 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
700 metaconn_t *mc = NULL,
702 int cached = META_TARGET_NONE,
703 i = META_TARGET_NONE,
709 meta_op_type op_type = META_OP_REQUIRE_SINGLE;
712 struct berval ndn = op->o_req_ndn,
715 SlapReply *candidates = meta_back_candidates_get( op );
717 /* Internal searches are privileged and shared. So is root. */
718 /* FIXME: there seem to be concurrency issues */
719 if ( op->o_do_not_cache || be_isroot( op ) ) {
720 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
721 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
722 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
725 mc_curr.mc_local_ndn = op->o_ndn;
727 /* Explicit binds must not be shared */
728 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
729 mc_curr.mc_conn = op->o_conn;
732 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
736 /* Searches for a metaconn in the avl tree */
737 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
738 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
739 (caddr_t)&mc_curr, meta_back_conn_cmp );
741 if ( mc->mc_tainted ) {
742 rs->sr_err = LDAP_UNAVAILABLE;
743 rs->sr_text = "remote server unavailable";
744 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
750 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
752 switch ( op->o_tag ) {
754 /* if we go to selection, the entry must not exist,
755 * and we must be able to resolve the parent */
757 dnParent( &ndn, &pndn );
760 case LDAP_REQ_MODRDN:
761 /* if nnewSuperior is not NULL, it must resolve
762 * to the same candidate as the req_ndn */
763 if ( op->orr_nnewSup ) {
769 /* if bound as rootdn, the backend must bind to all targets
770 * with the administrative identity */
771 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
772 op_type = META_OP_REQUIRE_ALL;
776 case LDAP_REQ_DELETE:
777 case LDAP_REQ_MODIFY:
778 /* just a unique candidate */
781 case LDAP_REQ_COMPARE:
782 case LDAP_REQ_SEARCH:
783 /* allow multiple candidates for the searchBase */
784 op_type = META_OP_ALLOW_MULTIPLE;
788 /* right now, just break (exop?) */
793 * require all connections ...
795 if ( op_type == META_OP_REQUIRE_ALL ) {
797 /* Looks like we didn't get a bind. Open a new session... */
799 mc = metaconn_alloc( op );
800 mc->mc_conn = mc_curr.mc_conn;
801 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
805 for ( i = 0; i < mi->mi_ntargets; i++ ) {
806 metatarget_t *mt = &mi->mi_targets[ i ];
807 metasingleconn_t *msc = &mc->mc_conns[ i ];
810 * The target is activated; if needed, it is
813 candidates[ i ].sr_err = meta_back_init_one_conn( op,
815 LDAP_BACK_CONN_ISPRIV( &mc_curr ),
816 i == mc->mc_authz_target, sendok );
817 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
818 candidates[ i ].sr_tag = META_CANDIDATE;
824 * FIXME: in case one target cannot
825 * be init'd, should the other ones
828 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
829 err = candidates[ i ].sr_err;
834 if ( ncandidates == 0 ) {
836 meta_back_freeconn( op, mc );
839 meta_back_release_conn( op, mc );
842 rs->sr_err = LDAP_NO_SUCH_OBJECT;
843 rs->sr_text = "Unable to select valid candidates";
845 if ( sendok & LDAP_BACK_SENDERR ) {
846 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
847 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
849 send_ldap_result( op, rs );
851 rs->sr_matched = NULL;
861 * looks in cache, if any
863 if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
864 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
867 if ( op_type == META_OP_REQUIRE_SINGLE ) {
868 metatarget_t *mt = NULL;
869 metasingleconn_t *msc = NULL;
873 for ( j = 0; j < mi->mi_ntargets; j++ ) {
874 candidates[ j ].sr_tag = META_NOT_CANDIDATE;
878 * tries to get a unique candidate
879 * (takes care of default target)
881 if ( i == META_TARGET_NONE ) {
882 i = meta_back_get_candidate( op, rs, &ndn );
884 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && parent ) {
885 i = meta_back_get_candidate( op, rs, &pndn );
888 if ( rs->sr_err != LDAP_SUCCESS ) {
890 meta_back_release_conn( op, mc );
893 if ( sendok & LDAP_BACK_SENDERR ) {
894 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
895 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
897 send_ldap_result( op, rs );
899 rs->sr_matched = NULL;
906 if ( newparent && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
909 meta_back_release_conn( op, mc );
912 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
913 rs->sr_text = "cross-target rename not supported";
914 if ( sendok & LDAP_BACK_SENDERR ) {
915 send_ldap_result( op, rs );
922 Debug( LDAP_DEBUG_TRACE,
923 "==>meta_back_getconn: got target %d for ndn=\"%s\" from cache\n",
924 i, op->o_req_ndn.bv_val, 0 );
927 /* Retries searching for a metaconn in the avl tree
928 * the reason is that the connection might have been
929 * created by meta_back_get_candidate() */
930 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
931 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
932 (caddr_t)&mc_curr, meta_back_conn_cmp );
936 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
938 /* Looks like we didn't get a bind. Open a new session... */
940 mc = metaconn_alloc( op );
941 mc->mc_conn = mc_curr.mc_conn;
942 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
948 * Clear all other candidates
950 ( void )meta_clear_unused_candidates( op, i );
952 mt = &mi->mi_targets[ i ];
953 msc = &mc->mc_conns[ i ];
956 * The target is activated; if needed, it is
957 * also init'd. In case of error, meta_back_init_one_conn
958 * sends the appropriate result.
960 err = meta_back_init_one_conn( op, rs, mt, mc, msc,
961 LDAP_BACK_CONN_ISPRIV( &mc_curr ),
962 i == mc->mc_authz_target, sendok );
963 if ( err != LDAP_SUCCESS ) {
965 * FIXME: in case one target cannot
966 * be init'd, should the other ones
969 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
971 (void)meta_clear_one_candidate( msc );
972 meta_back_freeconn( op, mc );
975 meta_back_release_conn( op, mc );
980 candidates[ i ].sr_err = LDAP_SUCCESS;
981 candidates[ i ].sr_tag = META_CANDIDATE;
989 * if no unique candidate ...
993 /* Looks like we didn't get a bind. Open a new session... */
995 mc = metaconn_alloc( op );
996 mc->mc_conn = mc_curr.mc_conn;
997 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1001 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1002 metatarget_t *mt = &mi->mi_targets[ i ];
1003 metasingleconn_t *msc = &mc->mc_conns[ i ];
1006 || meta_back_is_candidate( &mt->mt_nsuffix,
1009 LDAP_SCOPE_SUBTREE ) )
1013 * The target is activated; if needed, it is
1016 int lerr = meta_back_init_one_conn( op, rs,
1018 LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1019 i == mc->mc_authz_target,
1021 if ( lerr == LDAP_SUCCESS ) {
1022 candidates[ i ].sr_tag = META_CANDIDATE;
1023 candidates[ i ].sr_err = LDAP_SUCCESS;
1026 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_init_one_conn(%d)\n",
1027 op->o_log_prefix, i, 0 );
1032 * FIXME: in case one target cannot
1033 * be init'd, should the other ones
1037 ( void )meta_clear_one_candidate( msc );
1039 /* leave the target candidate, but record the error for later use */
1040 candidates[ i ].sr_err = lerr;
1043 Debug( LDAP_DEBUG_ANY, "%s: meta_back_init_one_conn(%d) failed: %d\n",
1044 op->o_log_prefix, i, lerr );
1051 ( void )meta_clear_one_candidate( msc );
1053 candidates[ i ].sr_tag = META_NOT_CANDIDATE;
1057 if ( ncandidates == 0 ) {
1059 meta_back_freeconn( op, mc );
1062 meta_back_release_conn( op, mc );
1065 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1066 rs->sr_text = "Unable to select valid candidates";
1068 if ( sendok & LDAP_BACK_SENDERR ) {
1069 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1070 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1072 send_ldap_result( op, rs );
1074 rs->sr_matched = NULL;
1082 /* clear out meta_back_init_one_conn non-fatal errors */
1083 rs->sr_err = LDAP_SUCCESS;
1089 * Inserts the newly created metaconn in the avl tree
1091 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1092 err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1093 meta_back_conn_cmp, meta_back_conn_dup );
1095 #if PRINT_CONNTREE > 0
1096 myprint( mi->mi_conninfo.lai_tree );
1097 #endif /* PRINT_CONNTREE */
1099 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1102 * Err could be -1 in case a duplicate metaconn is inserted
1104 * FIXME: what if the same client issues more than one
1105 * asynchronous operations?
1108 Debug( LDAP_DEBUG_ANY,
1109 "%s meta_back_getconn: candidates=%d conn=%ld insert failed\n",
1110 op->o_log_prefix, ncandidates,
1111 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1113 rs->sr_err = LDAP_OTHER;
1114 rs->sr_text = "Internal server error";
1115 meta_back_freeconn( op, mc );
1116 if ( sendok & LDAP_BACK_SENDERR ) {
1117 send_ldap_result( op, rs );
1123 Debug( LDAP_DEBUG_TRACE,
1124 "%s meta_back_getconn: candidates=%d conn=%ld inserted\n",
1125 op->o_log_prefix, ncandidates,
1126 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1129 Debug( LDAP_DEBUG_TRACE,
1130 "%s meta_back_getconn: candidates=%d conn=%ld fetched\n",
1131 op->o_log_prefix, ncandidates,
1132 LDAP_BACK_PCONN_ID( mc->mc_conn ) );
1139 meta_back_release_conn(
1143 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
1145 assert( mc != NULL );
1147 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1148 assert( mc->mc_refcnt > 0 );
1150 if ( mc->mc_refcnt == 0 && mc->mc_tainted ) {
1151 (void)avl_delete( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1152 meta_back_conn_cmp );
1153 meta_back_conn_free( mc );
1155 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );