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 * meta_back_conndn_cmp
40 * compares two struct metaconn based on the value of the conn pointer
41 * and of the local DN; used by avl stuff
48 metaconn_t *mc1 = ( metaconn_t * )c1;
49 metaconn_t *mc2 = ( metaconn_t * )c2;
52 /* If local DNs don't match, it is definitely not a match */
53 /* For shared sessions, conn is NULL. Only explicitly
54 * bound sessions will have non-NULL conn.
56 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
58 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
65 * meta_back_conndnmc_cmp
67 * compares two struct metaconn based on the value of the conn pointer,
68 * the local DN and the struct pointer; used by avl stuff
71 meta_back_conndnmc_cmp(
75 metaconn_t *mc1 = ( metaconn_t * )c1;
76 metaconn_t *mc2 = ( metaconn_t * )c2;
79 /* If local DNs don't match, it is definitely not a match */
80 /* For shared sessions, conn is NULL. Only explicitly
81 * bound sessions will have non-NULL conn.
83 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
85 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
87 rc = SLAP_PTRCMP( mc1, mc2 );
97 * compares two struct metaconn based on the value of the conn pointer;
105 metaconn_t *mc1 = ( metaconn_t * )c1;
106 metaconn_t *mc2 = ( metaconn_t * )c2;
108 /* For shared sessions, conn is NULL. Only explicitly
109 * bound sessions will have non-NULL conn.
111 return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
115 * meta_back_conndn_dup
117 * returns -1 in case a duplicate struct metaconn has been inserted;
121 meta_back_conndn_dup(
125 metaconn_t *mc1 = ( metaconn_t * )c1;
126 metaconn_t *mc2 = ( metaconn_t * )c2;
128 /* Cannot have more than one shared session with same DN */
129 if ( mc1->mc_conn == mc2->mc_conn &&
130 dn_match( &mc1->mc_local_ndn, &mc2->mc_local_ndn ) )
139 * Debug stuff (got it from libavl)
141 #if META_BACK_PRINT_CONNTREE > 0
143 ravl_print( Avlnode *root, int depth )
152 ravl_print( root->avl_right, depth + 1 );
154 for ( i = 0; i < depth; i++ ) {
155 fprintf( stderr, "-" );
158 mc = (metaconn_t *)root->avl_data;
159 fprintf( stderr, "mc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
161 mc->mc_local_ndn.bv_val ? mc->mc_local_ndn.bv_val : "",
163 avl_bf2str( root->avl_bf ), mc->mc_refcnt );
165 ravl_print( root->avl_left, depth + 1 );
169 meta_back_print_conntree( Avlnode *root, char *msg )
171 fprintf( stderr, "========> %s\n", msg );
174 fprintf( stderr, "\t(empty)\n" );
177 ravl_print( root, 0 );
180 fprintf( stderr, "<======== %s\n", msg );
182 #endif /* META_BACK_PRINT_CONNTREE */
190 * Allocates a connection structure, making room for all the referenced targets
196 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
198 int ntargets = mi->mi_ntargets;
200 assert( ntargets > 0 );
202 /* malloc all in one */
203 mc = ( metaconn_t * )ch_calloc( 1, sizeof( metaconn_t )
204 + sizeof( metasingleconn_t ) * ntargets );
211 mc->mc_authz_target = META_BOUND_NONE;
218 * meta_back_init_one_conn
220 * Initializes one connection
223 meta_back_init_one_conn(
229 ldap_back_send_t sendok )
231 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
232 metatarget_t *mt = mi->mi_targets[ candidate ];
233 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
236 int isauthz = ( candidate == mc->mc_authz_target );
239 #endif /* HAVE_TLS */
241 /* if the server is quarantined, and
242 * - the current interval did not expire yet, or
243 * - no more retries should occur,
244 * don't return the connection */
245 if ( mt->mt_isquarantined ) {
246 slap_retry_info_t *ri = &mt->mt_quarantine;
249 if ( mt->mt_isquarantined == LDAP_BACK_FQ_YES ) {
250 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
251 || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
253 if ( LogTest( LDAP_DEBUG_ANY ) ) {
254 char buf[ SLAP_TEXT_BUFLEN ];
256 snprintf( buf, sizeof( buf ),
257 "meta_back_init_one_conn[%d]: quarantine "
258 "retry block #%d try #%d",
259 candidate, ri->ri_idx, ri->ri_count );
260 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
261 op->o_log_prefix, buf, 0 );
264 mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING;
269 rs->sr_err = LDAP_UNAVAILABLE;
270 if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
271 send_ldap_result( op, rs );
280 if ( msc->msc_ld != NULL ) {
281 return rs->sr_err = LDAP_SUCCESS;
284 msc->msc_mscflags = 0;
287 * Attempts to initialize the connection to the target ds
289 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
290 rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
292 is_ldaps = ldap_is_ldaps_url( mt->mt_uri );
293 #endif /* HAVE_TLS */
294 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
295 if ( rs->sr_err != LDAP_SUCCESS ) {
300 * Set LDAP version. This will always succeed: If the client
301 * bound with a particular version, then so can we.
303 if ( mt->mt_version != 0 ) {
304 version = mt->mt_version;
306 } else if ( op->o_conn->c_protocol != 0 ) {
307 version = op->o_conn->c_protocol;
310 version = LDAP_VERSION3;
312 ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version );
313 ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p );
315 /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
316 ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
317 LDAP_BACK_CHASE_REFERRALS( mi ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
320 /* start TLS ("tls [try-]{start|propagate}" statement) */
321 if ( ( LDAP_BACK_USE_TLS( mi ) || ( op->o_conn->c_is_tls && LDAP_BACK_PROPAGATE_TLS( mi ) ) )
324 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
326 * use asynchronous StartTLS; in case, chase referral
327 * FIXME: OpenLDAP does not return referral on StartTLS yet
331 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
332 if ( rs->sr_err == LDAP_SUCCESS ) {
333 LDAPMessage *res = NULL;
334 int rc, nretries = mt->mt_nretries;
337 LDAP_BACK_TV_SET( &tv );
340 rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
343 rs->sr_err = LDAP_OTHER;
347 if ( nretries != 0 ) {
348 if ( nretries > 0 ) {
351 LDAP_BACK_TV_SET( &tv );
354 rs->sr_err = LDAP_OTHER;
358 /* only touch when activity actually took place... */
359 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
360 msc->msc_time = op->o_time;
365 if ( rc == LDAP_RES_EXTENDED ) {
366 struct berval *data = NULL;
368 /* NOTE: right now, data is unused, so don't get it */
369 rs->sr_err = ldap_parse_extended_result( msc->msc_ld, res,
370 NULL, NULL /* &data */ , 0 );
371 if ( rs->sr_err == LDAP_SUCCESS ) {
374 /* FIXME: matched? referrals? response controls? */
375 rs->sr_err = ldap_parse_result( msc->msc_ld, res,
376 &err, NULL, NULL, NULL, NULL, 1 );
379 if ( rs->sr_err == LDAP_SUCCESS ) {
383 /* FIXME: in case a referral
384 * is returned, should we try
385 * using it instead of the
387 if ( rs->sr_err == LDAP_SUCCESS ) {
388 ldap_install_tls( msc->msc_ld );
390 } else if ( rs->sr_err == LDAP_REFERRAL ) {
391 /* FIXME: LDAP_OPERATIONS_ERROR? */
392 rs->sr_err = LDAP_OTHER;
393 rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
397 if ( data->bv_val ) {
398 ber_memfree( data->bv_val );
405 rs->sr_err = LDAP_OTHER;
412 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
414 * use synchronous StartTLS
416 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
417 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
419 /* if StartTLS is requested, only attempt it if the URL
420 * is not "ldaps://"; this may occur not only in case
421 * of misconfiguration, but also when used in the chain
422 * overlay, where the "uri" can be parsed out of a referral */
423 if ( rs->sr_err == LDAP_SERVER_DOWN
424 || ( rs->sr_err != LDAP_SUCCESS && LDAP_BACK_TLS_CRITICAL( mi ) ) )
428 Debug( LDAP_DEBUG_ANY, "### %s meta_back_init_one_conn(TLS) ldap_unbind_ext[%d] ld=%p\n",
429 op->o_log_prefix, candidate, (void *)msc->msc_ld );
432 ldap_unbind_ext( msc->msc_ld, NULL, NULL );
437 #endif /* HAVE_TLS */
440 * Set the network timeout if set
442 if ( mt->mt_network_timeout != 0 ) {
443 struct timeval network_timeout;
445 network_timeout.tv_usec = 0;
446 network_timeout.tv_sec = mt->mt_network_timeout;
448 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
449 (void *)&network_timeout );
453 * If the connection DN is not null, an attempt to rewrite it is made
457 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
458 ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
459 if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
460 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
464 ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
467 LDAP_BACK_CONN_ISPRIV_SET( msc );
470 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
471 memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
472 ber_memfree_x( msc->msc_cred.bv_val, NULL );
473 BER_BVZERO( &msc->msc_cred );
475 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
476 ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
477 BER_BVZERO( &msc->msc_bound_ndn );
479 if ( !BER_BVISEMPTY( &op->o_ndn )
480 && SLAP_IS_AUTHZ_BACKEND( op )
484 dc.conn = op->o_conn;
489 * Rewrite the bind dn if needed
491 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
492 &msc->msc_bound_ndn ) )
496 Debug( LDAP_DEBUG_ANY, "### %s meta_back_init_one_conn(rewrite) ldap_unbind_ext[%d] ld=%p\n",
497 op->o_log_prefix, candidate, (void *)msc->msc_ld );
500 ldap_unbind_ext( msc->msc_ld, NULL, NULL );
505 /* copy the DN if needed */
506 if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
507 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
511 ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
515 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
518 if ( rs->sr_err == LDAP_SUCCESS ) {
520 * Sets a cookie for the rewrite session
522 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
525 rs->sr_err = slap_map_api2result( rs );
526 if ( sendok & LDAP_BACK_SENDERR ) {
527 send_ldap_result( op, rs );
538 * Retries one connection
546 ldap_back_send_t sendok )
548 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
549 metatarget_t *mt = mi->mi_targets[ candidate ];
550 metaconn_t *mc = *mcp;
551 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
552 int rc = LDAP_UNAVAILABLE,
555 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
556 binding = LDAP_BACK_CONN_BINDING( msc );
558 assert( mc->mc_refcnt > 0 );
559 if ( mc->mc_refcnt == 1 ) {
560 if ( LogTest( LDAP_DEBUG_ANY ) ) {
561 char buf[ SLAP_TEXT_BUFLEN ];
563 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
564 snprintf( buf, sizeof( buf ),
565 "retrying URI=\"%s\" DN=\"%s\"",
567 BER_BVISNULL( &msc->msc_bound_ndn ) ?
568 "" : msc->msc_bound_ndn.bv_val );
569 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
571 Debug( LDAP_DEBUG_ANY,
572 "%s meta_back_retry[%d]: %s.\n",
573 op->o_log_prefix, candidate, buf );
576 meta_clear_one_candidate( op, mc, candidate );
577 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
579 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
581 /* mc here must be the regular mc, reset and ready for init */
582 rc = meta_back_init_one_conn( op, rs, mc, candidate,
583 LDAP_BACK_CONN_ISPRIV( mc ), sendok );
585 /* restore the "binding" flag, in case */
587 LDAP_BACK_CONN_BINDING_SET( msc );
590 if ( rc == LDAP_SUCCESS ) {
591 rc = meta_back_single_dobind( op, rs, mcp, candidate,
592 sendok, mt->mt_nretries, 0 );
594 Debug( LDAP_DEBUG_ANY,
595 "%s meta_back_retry[%d]: "
596 "meta_back_single_dobind=%d\n",
597 op->o_log_prefix, candidate, rc );
598 if ( rc == LDAP_SUCCESS ) {
599 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
600 !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
602 LDAP_BACK_CONN_ISBOUND_SET( msc );
605 LDAP_BACK_CONN_ISANON_SET( msc );
608 /* when bound, dispose of the "binding" flag */
610 LDAP_BACK_CONN_BINDING_CLEAR( msc );
616 if ( rc != LDAP_SUCCESS ) {
617 SlapReply *candidates = meta_back_candidates_get( op );
619 candidates[ candidate ].sr_err = rc;
621 if ( *mcp != NULL ) {
623 LDAP_BACK_CONN_BINDING_CLEAR( msc );
625 LDAP_BACK_CONN_TAINTED_SET( mc );
626 /* only release if mandatory; otherwise
627 * let the caller do what's best before
629 if ( META_BACK_ONERR_STOP( mi ) ) {
630 meta_back_release_conn_lock( op, mc, 0 );
638 send_ldap_result( op, rs );
642 if ( META_BACK_TGT_QUARANTINE( mt ) ) {
643 meta_back_quarantine( op, rs, candidate );
646 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
648 return rc == LDAP_SUCCESS ? 1 : 0;
652 * callback for unique candidate selection
655 meta_back_conn_cb( Operation *op, SlapReply *rs )
657 assert( op->o_tag == LDAP_REQ_SEARCH );
659 switch ( rs->sr_type ) {
661 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
677 meta_back_get_candidate(
682 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
686 * tries to get a unique candidate
687 * (takes care of default target)
689 candidate = meta_back_select_unique_candidate( mi, ndn );
692 * if any is found, inits the connection
694 if ( candidate == META_TARGET_NONE ) {
695 rs->sr_err = LDAP_NO_SUCH_OBJECT;
696 rs->sr_text = "no suitable candidate target found";
698 } else if ( candidate == META_TARGET_MULTIPLE ) {
701 SlapReply rs2 = { 0 };
702 slap_callback cb2 = { 0 };
705 /* try to get a unique match for the request ndn
706 * among the multiple candidates available */
707 op2.o_tag = LDAP_REQ_SEARCH;
709 op2.o_req_ndn = *ndn;
710 op2.ors_scope = LDAP_SCOPE_BASE;
711 op2.ors_deref = LDAP_DEREF_NEVER;
712 op2.ors_attrs = slap_anlist_no_attrs;
713 op2.ors_attrsonly = 0;
714 op2.ors_limit = NULL;
716 op2.ors_tlimit = SLAP_NO_LIMIT;
718 f.f_choice = LDAP_FILTER_PRESENT;
719 f.f_desc = slap_schema.si_ad_objectClass;
721 BER_BVSTR( &op2.ors_filterstr, "(objectClass=*)" );
723 op2.o_callback = &cb2;
724 cb2.sc_response = meta_back_conn_cb;
725 cb2.sc_private = (void *)&candidate;
727 rc = op->o_bd->be_search( &op2, &rs2 );
729 switch ( rs2.sr_err ) {
732 rs->sr_err = rs2.sr_err;
735 case LDAP_SIZELIMIT_EXCEEDED:
736 /* if multiple candidates can serve the operation,
737 * and a default target is defined, and it is
738 * a candidate, try using it (FIXME: YMMV) */
739 if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
740 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
741 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
743 candidate = mi->mi_defaulttarget;
744 rs->sr_err = LDAP_SUCCESS;
748 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
749 rs->sr_text = "cannot select unique candidate target";
755 rs->sr_err = LDAP_SUCCESS;
761 static void *meta_back_candidates_dummy;
764 meta_back_candidates_keyfree(
768 metacandidates_t *mc = (metacandidates_t *)data;
770 ber_memfree_x( mc->mc_candidates, NULL );
771 ber_memfree_x( data, NULL );
775 meta_back_candidates_get( Operation *op )
777 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
778 metacandidates_t *mc;
780 if ( op->o_threadctx ) {
783 ldap_pvt_thread_pool_getkey( op->o_threadctx,
784 &meta_back_candidates_dummy, &data, NULL );
785 mc = (metacandidates_t *)data;
788 mc = mi->mi_candidates;
792 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
793 mc->mc_ntargets = mi->mi_ntargets;
794 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
795 if ( op->o_threadctx ) {
799 ldap_pvt_thread_pool_setkey( op->o_threadctx,
800 &meta_back_candidates_dummy, data,
801 meta_back_candidates_keyfree );
804 mi->mi_candidates = mc;
807 } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
808 /* NOTE: in the future, may want to allow back-config
809 * to add/remove targets from back-meta... */
810 mc->mc_candidates = ch_realloc( mc->mc_candidates,
811 sizeof( SlapReply ) * mi->mi_ntargets );
812 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
813 sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
814 mc->mc_ntargets = mi->mi_ntargets;
817 return mc->mc_candidates;
823 * Prepares the connection structure
827 * - determine what DN is being requested:
829 * op requires candidate checks
831 * add unique parent of o_req_ndn
832 * bind unique^*[/all] o_req_ndn [no check]
833 * compare unique^+ o_req_ndn
834 * delete unique o_req_ndn
835 * modify unique o_req_ndn
836 * search any o_req_ndn
837 * modrdn unique[, unique] o_req_ndn[, orr_nnewSup]
839 * - for ops that require the candidate to be unique, in case of multiple
840 * occurrences an internal search with sizeLimit=1 is performed
841 * if a unique candidate can actually be determined. If none is found,
842 * the operation aborts; if multiple are found, the default target
843 * is used if defined and candidate; otherwise the operation aborts.
845 * *^note: actually, the bind operation is handled much like a search;
846 * i.e. the bind is broadcast to all candidate targets.
848 * +^note: actually, the compare operation is handled much like a search;
849 * i.e. the compare is broadcast to all candidate targets, while checking
850 * that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
858 ldap_back_send_t sendok )
860 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
861 metaconn_t *mc = NULL,
863 int cached = META_TARGET_NONE,
864 i = META_TARGET_NONE,
870 meta_op_type op_type = META_OP_REQUIRE_SINGLE;
874 META_DNTYPE_NEWPARENT
875 } dn_type = META_DNTYPE_ENTRY;
876 struct berval ndn = op->o_req_ndn,
879 SlapReply *candidates = meta_back_candidates_get( op );
881 /* Internal searches are privileged and shared. So is root. */
882 /* FIXME: there seem to be concurrency issues */
883 if ( op->o_do_not_cache || be_isroot( op ) ) {
884 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
885 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
886 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
889 mc_curr.mc_local_ndn = op->o_ndn;
891 /* Explicit binds must not be shared */
892 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
893 mc_curr.mc_conn = op->o_conn;
896 mc_curr.mc_conn = LDAP_BACK_PCONN_SET( op );
900 /* Explicit Bind requests always get their own conn */
901 if ( !( sendok & LDAP_BACK_BINDING ) ) {
902 /* Searches for a metaconn in the avl tree */
904 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
905 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
906 (caddr_t)&mc_curr, meta_back_conndn_cmp );
908 if ( ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
909 || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
911 #if META_BACK_PRINT_CONNTREE > 0
912 meta_back_print_conntree( mi->mi_conninfo.lai_tree, ">>> meta_back_getconn" );
913 #endif /* META_BACK_PRINT_CONNTREE */
914 /* don't let anyone else use this expired connection */
915 (void)avl_delete( &mi->mi_conninfo.lai_tree,
916 (caddr_t)mc, meta_back_conndnmc_cmp );
917 #if META_BACK_PRINT_CONNTREE > 0
918 meta_back_print_conntree( mi->mi_conninfo.lai_tree, "<<< meta_back_getconn" );
919 #endif /* META_BACK_PRINT_CONNTREE */
920 LDAP_BACK_CONN_TAINTED_SET( mc );
922 Debug( LDAP_DEBUG_TRACE, "%s meta_back_getconn: mc=%p conn=%ld expired.\n",
923 op->o_log_prefix, (void *)mc, LDAP_BACK_PCONN_ID( mc ) );
926 /* Don't reuse connections while they're still binding */
927 if ( LDAP_BACK_CONN_BINDING( mc ) ) {
928 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
929 ldap_pvt_thread_yield();
935 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
938 switch ( op->o_tag ) {
940 /* if we go to selection, the entry must not exist,
941 * and we must be able to resolve the parent */
942 dn_type = META_DNTYPE_PARENT;
943 dnParent( &ndn, &pndn );
946 case LDAP_REQ_MODRDN:
947 /* if nnewSuperior is not NULL, it must resolve
948 * to the same candidate as the req_ndn */
949 if ( op->orr_nnewSup ) {
950 dn_type = META_DNTYPE_NEWPARENT;
955 /* if bound as rootdn, the backend must bind to all targets
956 * with the administrative identity */
957 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
958 op_type = META_OP_REQUIRE_ALL;
962 case LDAP_REQ_DELETE:
963 case LDAP_REQ_MODIFY:
964 /* just a unique candidate */
967 case LDAP_REQ_COMPARE:
968 case LDAP_REQ_SEARCH:
969 /* allow multiple candidates for the searchBase */
970 op_type = META_OP_ALLOW_MULTIPLE;
974 /* right now, just break (exop?) */
979 * require all connections ...
981 if ( op_type == META_OP_REQUIRE_ALL ) {
983 /* Looks like we didn't get a bind. Open a new session... */
985 assert( new_conn == 0 );
986 mc = metaconn_alloc( op );
987 mc->mc_conn = mc_curr.mc_conn;
988 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
990 if ( sendok & LDAP_BACK_BINDING ) {
991 LDAP_BACK_CONN_BINDING_SET( mc );
995 for ( i = 0; i < mi->mi_ntargets; i++ ) {
997 * The target is activated; if needed, it is
1000 candidates[ i ].sr_err = meta_back_init_one_conn( op,
1001 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1003 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1004 META_CANDIDATE_SET( &candidates[ i ] );
1010 * FIXME: in case one target cannot
1011 * be init'd, should the other ones
1014 META_CANDIDATE_RESET( &candidates[ i ] );
1015 err = candidates[ i ].sr_err;
1020 if ( ncandidates == 0 ) {
1023 meta_back_conn_free( mc );
1026 meta_back_release_conn( op, mc );
1029 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1030 rs->sr_text = "Unable to select valid candidates";
1032 if ( sendok & LDAP_BACK_SENDERR ) {
1033 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1034 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1036 send_ldap_result( op, rs );
1038 rs->sr_matched = NULL;
1048 * looks in cache, if any
1050 if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1051 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1054 if ( op_type == META_OP_REQUIRE_SINGLE ) {
1055 metatarget_t *mt = NULL;
1056 metasingleconn_t *msc = NULL;
1060 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1061 META_CANDIDATE_RESET( &candidates[ j ] );
1065 * tries to get a unique candidate
1066 * (takes care of default target)
1068 if ( i == META_TARGET_NONE ) {
1069 i = meta_back_get_candidate( op, rs, &ndn );
1071 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1072 i = meta_back_get_candidate( op, rs, &pndn );
1075 if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1077 meta_back_release_conn( op, mc );
1080 if ( sendok & LDAP_BACK_SENDERR ) {
1081 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1082 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1084 send_ldap_result( op, rs );
1086 rs->sr_matched = NULL;
1093 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1096 meta_back_release_conn( op, mc );
1099 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1100 rs->sr_text = "cross-target rename not supported";
1101 if ( sendok & LDAP_BACK_SENDERR ) {
1102 send_ldap_result( op, rs );
1109 Debug( LDAP_DEBUG_TRACE,
1110 "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1111 i, op->o_req_ndn.bv_val, 0 );
1114 /* Retries searching for a metaconn in the avl tree
1115 * the reason is that the connection might have been
1116 * created by meta_back_get_candidate() */
1117 if ( !( sendok & LDAP_BACK_BINDING ) ) {
1119 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1120 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1121 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1123 /* Don't reuse connections while they're still binding */
1124 if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1125 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1126 ldap_pvt_thread_yield();
1132 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1135 /* Looks like we didn't get a bind. Open a new session... */
1137 assert( new_conn == 0 );
1138 mc = metaconn_alloc( op );
1139 mc->mc_conn = mc_curr.mc_conn;
1140 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1142 if ( sendok & LDAP_BACK_BINDING ) {
1143 LDAP_BACK_CONN_BINDING_SET( mc );
1149 * Clear all other candidates
1151 ( void )meta_clear_unused_candidates( op, i );
1153 mt = mi->mi_targets[ i ];
1154 msc = &mc->mc_conns[ i ];
1157 * The target is activated; if needed, it is
1158 * also init'd. In case of error, meta_back_init_one_conn
1159 * sends the appropriate result.
1161 err = meta_back_init_one_conn( op, rs, mc, i,
1162 LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok );
1163 if ( err != LDAP_SUCCESS ) {
1165 * FIXME: in case one target cannot
1166 * be init'd, should the other ones
1169 META_CANDIDATE_RESET( &candidates[ i ] );
1172 meta_back_conn_free( mc );
1175 meta_back_release_conn( op, mc );
1180 candidates[ i ].sr_err = LDAP_SUCCESS;
1181 META_CANDIDATE_SET( &candidates[ i ] );
1189 * if no unique candidate ...
1193 /* Looks like we didn't get a bind. Open a new session... */
1195 assert( new_conn == 0 );
1196 mc = metaconn_alloc( op );
1197 mc->mc_conn = mc_curr.mc_conn;
1198 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1200 if ( sendok & LDAP_BACK_BINDING ) {
1201 LDAP_BACK_CONN_BINDING_SET( mc );
1205 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1206 metatarget_t *mt = mi->mi_targets[ i ];
1208 META_CANDIDATE_RESET( &candidates[ i ] );
1211 || meta_back_is_candidate( mt, &op->o_req_ndn,
1212 LDAP_SCOPE_SUBTREE ) )
1216 * The target is activated; if needed, it is
1219 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1220 LDAP_BACK_CONN_ISPRIV( &mc_curr ), LDAP_BACK_DONTSEND );
1221 if ( lerr == LDAP_SUCCESS ) {
1222 META_CANDIDATE_SET( &candidates[ i ] );
1223 candidates[ i ].sr_err = LDAP_SUCCESS;
1226 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1227 op->o_log_prefix, i, 0 );
1229 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1230 META_CANDIDATE_SET( &candidates[ i ] );
1231 candidates[ i ].sr_err = LDAP_UNAVAILABLE;
1233 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1234 op->o_log_prefix, i,
1235 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1240 * FIXME: in case one target cannot
1241 * be init'd, should the other ones
1245 ( void )meta_clear_one_candidate( op, mc, i );
1247 /* leave the target candidate, but record the error for later use */
1248 candidates[ i ].sr_err = lerr;
1251 if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1252 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined: %d\n",
1253 op->o_log_prefix, i, lerr );
1256 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed: %d\n",
1257 op->o_log_prefix, i, lerr );
1260 if ( META_BACK_ONERR_STOP( mi ) ) {
1261 if ( sendok & LDAP_BACK_SENDERR ) {
1262 send_ldap_result( op, rs );
1267 meta_back_conn_free( mc );
1270 meta_back_release_conn( op, mc );
1282 ( void )meta_clear_one_candidate( op, mc, i );
1287 if ( ncandidates == 0 ) {
1290 meta_back_conn_free( mc );
1293 meta_back_release_conn( op, mc );
1296 if ( rs->sr_err == LDAP_SUCCESS ) {
1297 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1298 rs->sr_text = "Unable to select valid candidates";
1301 if ( sendok & LDAP_BACK_SENDERR ) {
1302 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1303 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1305 send_ldap_result( op, rs );
1307 rs->sr_matched = NULL;
1315 /* clear out meta_back_init_one_conn non-fatal errors */
1316 rs->sr_err = LDAP_SUCCESS;
1319 /* touch the timestamp */
1320 if ( mi->mi_idle_timeout != 0 ) {
1321 mc->mc_time = op->o_time;
1325 if ( mi->mi_conn_ttl ) {
1326 mc->mc_create_time = op->o_time;
1330 * Inserts the newly created metaconn in the avl tree
1332 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1333 #if META_BACK_PRINT_CONNTREE > 0
1334 meta_back_print_conntree( mi->mi_conninfo.lai_tree, ">>> meta_back_getconn" );
1335 #endif /* META_BACK_PRINT_CONNTREE */
1336 err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1337 meta_back_conndn_cmp, meta_back_conndn_dup );
1338 #if META_BACK_PRINT_CONNTREE > 0
1339 meta_back_print_conntree( mi->mi_conninfo.lai_tree, ">>> meta_back_getconn" );
1340 #endif /* META_BACK_PRINT_CONNTREE */
1341 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1344 * Err could be -1 in case a duplicate metaconn is inserted
1351 /* duplicate: free and try to get the newly created one */
1352 if ( !( sendok & LDAP_BACK_BINDING ) ) {
1356 LDAP_BACK_CONN_TAINTED_SET( mc );
1360 Debug( LDAP_DEBUG_ANY,
1361 "%s meta_back_getconn: candidates=%d conn=%ld insert failed\n",
1362 op->o_log_prefix, ncandidates,
1363 LDAP_BACK_PCONN_ID( mc ) );
1366 meta_back_conn_free( mc );
1368 rs->sr_err = LDAP_OTHER;
1369 rs->sr_text = "proxy bind collision";
1370 if ( sendok & LDAP_BACK_SENDERR ) {
1371 send_ldap_result( op, rs );
1377 Debug( LDAP_DEBUG_TRACE,
1378 "%s meta_back_getconn: candidates=%d conn=%ld inserted\n",
1379 op->o_log_prefix, ncandidates,
1380 LDAP_BACK_PCONN_ID( mc ) );
1383 Debug( LDAP_DEBUG_TRACE,
1384 "%s meta_back_getconn: candidates=%d conn=%ld fetched\n",
1385 op->o_log_prefix, ncandidates,
1386 LDAP_BACK_PCONN_ID( mc ) );
1393 meta_back_release_conn_lock(
1398 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
1400 assert( mc != NULL );
1403 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1405 assert( mc->mc_refcnt > 0 );
1407 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1408 /* NOTE: the connection is removed if either it is tainted
1409 * or if it is shared and no one else is using it. This needs
1410 * to occur because for intrinsic reasons cached connections
1411 * that are not privileged would live forever and pollute
1412 * the connection space (and eat up resources). Maybe this
1413 * should be configurable... */
1414 if ( LDAP_BACK_CONN_TAINTED( mc ) ||
1415 ( !LDAP_BACK_CONN_ISPRIV( mc ) &&
1416 LDAP_BACK_PCONN_ISPRIV( mc ) &&
1417 mc->mc_refcnt == 0 ) )
1419 Debug( LDAP_DEBUG_TRACE, "%s meta_back_release_conn: mc=%p conn=%ld tainted.\n",
1420 op->o_log_prefix, (void *)mc, LDAP_BACK_PCONN_ID( mc ) );
1421 #if META_BACK_PRINT_CONNTREE > 0
1422 meta_back_print_conntree( mi->mi_conninfo.lai_tree, ">>> meta_back_release_conn" );
1423 #endif /* META_BACK_PRINT_CONNTREE */
1424 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1425 ( caddr_t )mc, meta_back_conndnmc_cmp );
1426 #if META_BACK_PRINT_CONNTREE > 0
1427 meta_back_print_conntree( mi->mi_conninfo.lai_tree, "<<< meta_back_release_conn" );
1428 #endif /* META_BACK_PRINT_CONNTREE */
1429 if ( mc->mc_refcnt == 0 ) {
1430 meta_back_conn_free( mc );
1434 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1439 meta_back_quarantine(
1444 metainfo_t *mi = (metainfo_t *)op->o_bd->be_private;
1445 metatarget_t *mt = mi->mi_targets[ candidate ];
1447 slap_retry_info_t *ri = &mt->mt_quarantine;
1449 ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1451 if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1452 time_t new_last = slap_get_time();
1454 switch ( mt->mt_isquarantined ) {
1455 case LDAP_BACK_FQ_NO:
1456 if ( ri->ri_last == new_last ) {
1460 Debug( LDAP_DEBUG_ANY,
1461 "%s meta_back_quarantine[%d]: enter.\n",
1462 op->o_log_prefix, candidate, 0 );
1468 case LDAP_BACK_FQ_RETRYING:
1469 if ( LogTest( LDAP_DEBUG_ANY ) ) {
1470 char buf[ SLAP_TEXT_BUFLEN ];
1472 snprintf( buf, sizeof( buf ),
1473 "meta_back_quarantine[%d]: block #%d try #%d failed",
1474 candidate, ri->ri_idx, ri->ri_count );
1475 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1476 op->o_log_prefix, buf, 0 );
1480 if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1481 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1492 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1493 ri->ri_last = new_last;
1495 } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1496 Debug( LDAP_DEBUG_ANY,
1497 "%s meta_back_quarantine[%d]: exit.\n",
1498 op->o_log_prefix, candidate, 0 );
1500 if ( mi->mi_quarantine_f ) {
1501 (void)mi->mi_quarantine_f( mi, candidate,
1502 mi->mi_quarantine_p );
1507 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1511 ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );