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[netbsd-mini2440.git] / external / bsd / openldap / dist / servers / slapd / back-meta / conn.c
blob5b1782da1643f5e3a5bbd0c0d76251826558c374
1 /* $OpenLDAP: pkg/ldap/servers/slapd/back-meta/conn.c,v 1.86.2.15 2008/04/14 21:19:57 quanah Exp $ */
2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
3 *
4 * Copyright 1999-2008 The OpenLDAP Foundation.
5 * Portions Copyright 2001-2003 Pierangelo Masarati.
6 * Portions Copyright 1999-2003 Howard Chu.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted only as authorized by the OpenLDAP
11 * Public License.
12 *
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>.
16 */
17 /* ACKNOWLEDGEMENTS:
18 * This work was initially developed by the Howard Chu for inclusion
19 * in OpenLDAP Software and subsequently enhanced by Pierangelo
20 * Masarati.
21 */
22
23 #include "portable.h"
24
25 #include <stdio.h>
26
27 #include <ac/errno.h>
28 #include <ac/socket.h>
29 #include <ac/string.h>
30
31
32 #define AVL_INTERNAL
33 #include "slap.h"
34 #include "../back-ldap/back-ldap.h"
35 #include "back-meta.h"
36
37 /*
38 * meta_back_conndn_cmp
39 *
40 * compares two struct metaconn based on the value of the conn pointer
41 * and of the local DN; used by avl stuff
42 */
43 int
44 meta_back_conndn_cmp(
45 const void *c1,
46 const void *c2 )
47 {
48 metaconn_t *mc1 = ( metaconn_t * )c1;
49 metaconn_t *mc2 = ( metaconn_t * )c2;
50 int rc;
51
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.
55 */
56 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
57 if ( rc == 0 ) {
58 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
59 }
60
61 return rc;
62 }
63
64 /*
65 * meta_back_conndnmc_cmp
66 *
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
69 */
70 static int
71 meta_back_conndnmc_cmp(
72 const void *c1,
73 const void *c2 )
74 {
75 metaconn_t *mc1 = ( metaconn_t * )c1;
76 metaconn_t *mc2 = ( metaconn_t * )c2;
77 int rc;
78
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.
82 */
83 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
84 if ( rc == 0 ) {
85 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
86 if ( rc == 0 ) {
87 rc = SLAP_PTRCMP( mc1, mc2 );
88 }
89 }
90
91 return rc;
92 }
93
94 /*
95 * meta_back_conn_cmp
96 *
97 * compares two struct metaconn based on the value of the conn pointer;
98 * used by avl stuff
99 */
100 int
101 meta_back_conn_cmp(
102 const void *c1,
103 const void *c2 )
104 {
105 metaconn_t *mc1 = ( metaconn_t * )c1;
106 metaconn_t *mc2 = ( metaconn_t * )c2;
107
108 /* For shared sessions, conn is NULL. Only explicitly
109 * bound sessions will have non-NULL conn.
110 */
111 return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
112 }
113
114 /*
115 * meta_back_conndn_dup
116 *
117 * returns -1 in case a duplicate struct metaconn has been inserted;
118 * used by avl stuff
119 */
120 int
121 meta_back_conndn_dup(
122 void *c1,
123 void *c2 )
124 {
125 metaconn_t *mc1 = ( metaconn_t * )c1;
126 metaconn_t *mc2 = ( metaconn_t * )c2;
127
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 ) )
131 {
132 return -1;
133 }
134
135 return 0;
136 }
137
138 /*
139 * Debug stuff (got it from libavl)
140 */
141 #if META_BACK_PRINT_CONNTREE > 0
142 static void
143 meta_back_print( metaconn_t *mc, char *avlstr )
144 {
145 int i;
146
147 fputs( "targets=[", stderr );
148 for ( i = 0; i < mc->mc_info->mi_ntargets; i++ ) {
149 fputc( mc->mc_conns[ i ].msc_ld ? '*' : 'o', stderr);
150 }
151 fputc( ']', stderr );
152
153 fprintf( stderr, " mc=%p local=\"%s\" conn=%p refcnt=%d%s %s\n",
154 (void *)mc,
155 mc->mc_local_ndn.bv_val ? mc->mc_local_ndn.bv_val : "",
156 (void *)mc->mc_conn,
157 mc->mc_refcnt,
158 LDAP_BACK_CONN_TAINTED( mc ) ? " tainted" : "",
159 avlstr );
160 }
161
162 static void
163 meta_back_ravl_print( Avlnode *root, int depth )
164 {
165 int i;
166
167 if ( root == 0 ) {
168 return;
169 }
170
171 meta_back_ravl_print( root->avl_right, depth + 1 );
172
173 for ( i = 0; i < depth; i++ ) {
174 fprintf( stderr, "-" );
175 }
176 fputc( ' ', stderr );
177
178 meta_back_print( (metaconn_t *)root->avl_data,
179 avl_bf2str( root->avl_bf ) );
180
181 meta_back_ravl_print( root->avl_left, depth + 1 );
182 }
183
184 /* NOTE: duplicate from back-ldap/bind.c */
185 static char* priv2str[] = {
186 "privileged",
187 "privileged/TLS",
188 "anonymous",
189 "anonymous/TLS",
190 "bind",
191 "bind/TLS",
192 NULL
193 };
194
195 void
196 meta_back_print_conntree( metainfo_t *mi, char *msg )
197 {
198 int c;
199
200 fprintf( stderr, "========> %s\n", msg );
201
202 for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) {
203 int i = 0;
204 metaconn_t *mc;
205
206 fprintf( stderr, " %s[%d]\n", priv2str[ c ], mi->mi_conn_priv[ c ].mic_num );
207
208 LDAP_TAILQ_FOREACH( mc, &mi->mi_conn_priv[ c ].mic_priv, mc_q )
209 {
210 fprintf( stderr, " [%d] ", i );
211 meta_back_print( mc, "" );
212 i++;
213 }
214 }
215
216 if ( mi->mi_conninfo.lai_tree == NULL ) {
217 fprintf( stderr, "\t(empty)\n" );
218
219 } else {
220 meta_back_ravl_print( mi->mi_conninfo.lai_tree, 0 );
221 }
222
223 fprintf( stderr, "<======== %s\n", msg );
224 }
225 #endif /* META_BACK_PRINT_CONNTREE */
226 /*
227 * End of debug stuff
228 */
229
230 /*
231 * metaconn_alloc
232 *
233 * Allocates a connection structure, making room for all the referenced targets
234 */
235 static metaconn_t *
236 metaconn_alloc(
237 Operation *op )
238 {
239 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
240 metaconn_t *mc;
241 int ntargets = mi->mi_ntargets;
242
243 assert( ntargets > 0 );
244
245 /* malloc all in one */
246 mc = ( metaconn_t * )ch_calloc( 1, sizeof( metaconn_t )
247 + sizeof( metasingleconn_t ) * ( ntargets - 1 ) );
248 if ( mc == NULL ) {
249 return NULL;
250 }
251
252 mc->mc_info = mi;
253
254 mc->mc_authz_target = META_BOUND_NONE;
255 mc->mc_refcnt = 1;
256
257 return mc;
258 }
259
260 /*
261 * meta_back_init_one_conn
262 *
263 * Initializes one connection
264 */
265 int
266 meta_back_init_one_conn(
267 Operation *op,
268 SlapReply *rs,
269 metaconn_t *mc,
270 int candidate,
271 int ispriv,
272 ldap_back_send_t sendok,
273 int dolock )
274 {
275 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
276 metatarget_t *mt = mi->mi_targets[ candidate ];
277 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
278 int version;
279 dncookie dc;
280 int isauthz = ( candidate == mc->mc_authz_target );
281 int do_return = 0;
282 #ifdef HAVE_TLS
283 int is_ldaps = 0;
284 #endif /* HAVE_TLS */
285
286 /* if the server is quarantined, and
287 * - the current interval did not expire yet, or
288 * - no more retries should occur,
289 * don't return the connection */
290 if ( mt->mt_isquarantined ) {
291 slap_retry_info_t *ri = &mt->mt_quarantine;
292 int dont_retry = 1;
293
294 if ( mt->mt_quarantine.ri_interval ) {
295 ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
296 if ( mt->mt_isquarantined == LDAP_BACK_FQ_YES ) {
297 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
298 || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
299 if ( !dont_retry ) {
300 if ( LogTest( LDAP_DEBUG_ANY ) ) {
301 char buf[ SLAP_TEXT_BUFLEN ];
302
303 snprintf( buf, sizeof( buf ),
304 "meta_back_init_one_conn[%d]: quarantine "
305 "retry block #%d try #%d",
306 candidate, ri->ri_idx, ri->ri_count );
307 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
308 op->o_log_prefix, buf, 0 );
309 }
310 }
311
312 mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING;
313 }
314 ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
315 }
316
317 if ( dont_retry ) {
318 rs->sr_err = LDAP_UNAVAILABLE;
319 if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
320 rs->sr_text = "Target is quarantined";
321 send_ldap_result( op, rs );
322 }
323 return rs->sr_err;
324 }
325 }
326
327 retry_lock:;
328 if ( dolock ) {
329 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
330 }
331
332 /*
333 * Already init'ed
334 */
335 if ( LDAP_BACK_CONN_ISBOUND( msc )
336 || LDAP_BACK_CONN_ISANON( msc ) )
337 {
338 assert( msc->msc_ld != NULL );
339 rs->sr_err = LDAP_SUCCESS;
340 do_return = 1;
341
342 } else if ( META_BACK_CONN_CREATING( msc )
343 || LDAP_BACK_CONN_BINDING( msc ) )
344 {
345 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
346 if ( dolock ) {
347 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
348 }
349
350 ldap_pvt_thread_yield();
351 goto retry_lock;
352 }
353
354 /* sounds more appropriate */
355 rs->sr_err = LDAP_BUSY;
356 rs->sr_text = "No connections to target are available";
357 do_return = 1;
358
359 } else if ( META_BACK_CONN_INITED( msc ) ) {
360 assert( msc->msc_ld != NULL );
361 rs->sr_err = LDAP_SUCCESS;
362 do_return = 1;
363
364 } else {
365 /*
366 * creating...
367 */
368 META_BACK_CONN_CREATING_SET( msc );
369 }
370
371 if ( dolock ) {
372 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
373 }
374
375 if ( do_return ) {
376 if ( rs->sr_err != LDAP_SUCCESS
377 && op->o_conn
378 && ( sendok & LDAP_BACK_SENDERR ) )
379 {
380 send_ldap_result( op, rs );
381 }
382
383 return rs->sr_err;
384 }
385
386 assert( msc->msc_ld == NULL );
387
388 /*
389 * Attempts to initialize the connection to the target ds
390 */
391 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
392 rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
393 #ifdef HAVE_TLS
394 is_ldaps = ldap_is_ldaps_url( mt->mt_uri );
395 #endif /* HAVE_TLS */
396 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
397 if ( rs->sr_err != LDAP_SUCCESS ) {
398 goto error_return;
399 }
400
401 /*
402 * Set LDAP version. This will always succeed: If the client
403 * bound with a particular version, then so can we.
404 */
405 if ( mt->mt_version != 0 ) {
406 version = mt->mt_version;
407
408 } else if ( op->o_conn->c_protocol != 0 ) {
409 version = op->o_conn->c_protocol;
410
411 } else {
412 version = LDAP_VERSION3;
413 }
414 ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version );
415 ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p );
416
417 /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
418 ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
419 LDAP_BACK_CHASE_REFERRALS( mi ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
420
421 #ifdef HAVE_TLS
422 /* start TLS ("tls [try-]{start|propagate}" statement) */
423 if ( ( LDAP_BACK_USE_TLS( mi )
424 || ( op->o_conn->c_is_tls
425 && LDAP_BACK_PROPAGATE_TLS( mi ) ) )
426 && !is_ldaps )
427 {
428 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
429 /*
430 * use asynchronous StartTLS; in case, chase referral
431 * FIXME: OpenLDAP does not return referral on StartTLS yet
432 */
433 int msgid;
434
435 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
436 if ( rs->sr_err == LDAP_SUCCESS ) {
437 LDAPMessage *res = NULL;
438 int rc, nretries = mt->mt_nretries;
439 struct timeval tv;
440
441 LDAP_BACK_TV_SET( &tv );
442
443 retry:;
444 rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
445 switch ( rc ) {
446 case -1:
447 rs->sr_err = LDAP_OTHER;
448 break;
449
450 case 0:
451 if ( nretries != 0 ) {
452 if ( nretries > 0 ) {
453 nretries--;
454 }
455 LDAP_BACK_TV_SET( &tv );
456 goto retry;
457 }
458 rs->sr_err = LDAP_OTHER;
459 break;
460
461 default:
462 /* only touch when activity actually took place... */
463 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
464 msc->msc_time = op->o_time;
465 }
466 break;
467 }
468
469 if ( rc == LDAP_RES_EXTENDED ) {
470 struct berval *data = NULL;
471
472 /* NOTE: right now, data is unused, so don't get it */
473 rs->sr_err = ldap_parse_extended_result( msc->msc_ld,
474 res, NULL, NULL /* &data */ , 0 );
475 if ( rs->sr_err == LDAP_SUCCESS ) {
476 int err;
477
478 /* FIXME: matched? referrals? response controls? */
479 rs->sr_err = ldap_parse_result( msc->msc_ld,
480 res, &err, NULL, NULL, NULL, NULL, 1 );
481 res = NULL;
482
483 if ( rs->sr_err == LDAP_SUCCESS ) {
484 rs->sr_err = err;
485 }
486
487 /* FIXME: in case a referral
488 * is returned, should we try
489 * using it instead of the
490 * configured URI? */
491 if ( rs->sr_err == LDAP_SUCCESS ) {
492 ldap_install_tls( msc->msc_ld );
493
494 } else if ( rs->sr_err == LDAP_REFERRAL ) {
495 /* FIXME: LDAP_OPERATIONS_ERROR? */
496 rs->sr_err = LDAP_OTHER;
497 rs->sr_text = "Unwilling to chase referral "
498 "returned by Start TLS exop";
499 }
500
501 if ( data ) {
502 ber_bvfree( data );
503 }
504 }
505
506 } else {
507 rs->sr_err = LDAP_OTHER;
508 }
509
510 if ( res != NULL ) {
511 ldap_msgfree( res );
512 }
513 }
514 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
515 /*
516 * use synchronous StartTLS
517 */
518 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
519 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
520
521 /* if StartTLS is requested, only attempt it if the URL
522 * is not "ldaps://"; this may occur not only in case
523 * of misconfiguration, but also when used in the chain
524 * overlay, where the "uri" can be parsed out of a referral */
525 if ( rs->sr_err == LDAP_SERVER_DOWN
526 || ( rs->sr_err != LDAP_SUCCESS
527 && LDAP_BACK_TLS_CRITICAL( mi ) ) )
528 {
529
530 #ifdef DEBUG_205
531 Debug( LDAP_DEBUG_ANY,
532 "### %s meta_back_init_one_conn(TLS) "
533 "ldap_unbind_ext[%d] ld=%p\n",
534 op->o_log_prefix, candidate,
535 (void *)msc->msc_ld );
536 #endif /* DEBUG_205 */
537
538 /* need to trash a failed Start TLS */
539 meta_clear_one_candidate( op, mc, candidate );
540 goto error_return;
541 }
542 }
543 #endif /* HAVE_TLS */
544
545 /*
546 * Set the network timeout if set
547 */
548 if ( mt->mt_network_timeout != 0 ) {
549 struct timeval network_timeout;
550
551 network_timeout.tv_usec = 0;
552 network_timeout.tv_sec = mt->mt_network_timeout;
553
554 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
555 (void *)&network_timeout );
556 }
557
558 /*
559 * If the connection DN is not null, an attempt to rewrite it is made
560 */
561
562 if ( ispriv ) {
563 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
564 ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
565 if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
566 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
567 memset( msc->msc_cred.bv_val, 0,
568 msc->msc_cred.bv_len );
569 }
570 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
571 }
572
573 } else {
574 ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
575 }
576
577 } else {
578 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
579 memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
580 ber_memfree_x( msc->msc_cred.bv_val, NULL );
581 BER_BVZERO( &msc->msc_cred );
582 }
583 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
584 ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
585 BER_BVZERO( &msc->msc_bound_ndn );
586 }
587 if ( !BER_BVISEMPTY( &op->o_ndn )
588 && SLAP_IS_AUTHZ_BACKEND( op )
589 && isauthz )
590 {
591 dc.target = mt;
592 dc.conn = op->o_conn;
593 dc.rs = rs;
594 dc.ctx = "bindDN";
595
596 /*
597 * Rewrite the bind dn if needed
598 */
599 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
600 &msc->msc_bound_ndn ) )
601 {
602
603 #ifdef DEBUG_205
604 Debug( LDAP_DEBUG_ANY,
605 "### %s meta_back_init_one_conn(rewrite) "
606 "ldap_unbind_ext[%d] ld=%p\n",
607 op->o_log_prefix, candidate,
608 (void *)msc->msc_ld );
609 #endif /* DEBUG_205 */
610
611 /* need to trash a connection not fully established */
612 meta_clear_one_candidate( op, mc, candidate );
613 goto error_return;
614 }
615
616 /* copy the DN if needed */
617 if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
618 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
619 }
620
621 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
622
623 } else {
624 ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
625 }
626 }
627
628 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
629
630 error_return:;
631 if ( dolock ) {
632 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
633 }
634 META_BACK_CONN_CREATING_CLEAR( msc );
635 if ( rs->sr_err == LDAP_SUCCESS ) {
636 /*
637 * Sets a cookie for the rewrite session
638 */
639 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
640 META_BACK_CONN_INITED_SET( msc );
641 }
642 if ( dolock ) {
643 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
644 }
645
646 if ( rs->sr_err != LDAP_SUCCESS ) {
647 rs->sr_err = slap_map_api2result( rs );
648 if ( sendok & LDAP_BACK_SENDERR ) {
649 send_ldap_result( op, rs );
650 }
651 }
652
653 return rs->sr_err;
654 }
655
656 /*
657 * meta_back_retry
658 *
659 * Retries one connection
660 */
661 int
662 meta_back_retry(
663 Operation *op,
664 SlapReply *rs,
665 metaconn_t **mcp,
666 int candidate,
667 ldap_back_send_t sendok )
668 {
669 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
670 metatarget_t *mt = mi->mi_targets[ candidate ];
671 metaconn_t *mc = *mcp;
672 metasingleconn_t *msc = &mc->mc_conns[ candidate ];
673 int rc = LDAP_UNAVAILABLE,
674 binding,
675 quarantine = 1;
676
677 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
678
679 assert( !META_BACK_CONN_CREATING( msc ) );
680 binding = LDAP_BACK_CONN_BINDING( msc );
681 LDAP_BACK_CONN_BINDING_CLEAR( msc );
682
683 assert( mc->mc_refcnt > 0 );
684 if ( mc->mc_refcnt == 1 ) {
685 if ( LogTest( LDAP_DEBUG_ANY ) ) {
686 char buf[ SLAP_TEXT_BUFLEN ];
687
688 /* this lock is required; however,
689 * it's invoked only when logging is on */
690 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
691 snprintf( buf, sizeof( buf ),
692 "retrying URI=\"%s\" DN=\"%s\"",
693 mt->mt_uri,
694 BER_BVISNULL( &msc->msc_bound_ndn ) ?
695 "" : msc->msc_bound_ndn.bv_val );
696 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
697
698 Debug( LDAP_DEBUG_ANY,
699 "%s meta_back_retry[%d]: %s.\n",
700 op->o_log_prefix, candidate, buf );
701 }
702
703 meta_clear_one_candidate( op, mc, candidate );
704 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
705
706 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
707
708 /* mc here must be the regular mc, reset and ready for init */
709 rc = meta_back_init_one_conn( op, rs, mc, candidate,
710 LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 );
711
712 /* restore the "binding" flag, in case */
713 if ( binding ) {
714 LDAP_BACK_CONN_BINDING_SET( msc );
715 }
716
717 if ( rc == LDAP_SUCCESS ) {
718 quarantine = 0;
719 rc = meta_back_single_dobind( op, rs, mcp, candidate,
720 sendok, mt->mt_nretries, 0 );
721
722 Debug( LDAP_DEBUG_ANY,
723 "%s meta_back_retry[%d]: "
724 "meta_back_single_dobind=%d\n",
725 op->o_log_prefix, candidate, rc );
726 if ( rc == LDAP_SUCCESS ) {
727 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
728 !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
729 {
730 LDAP_BACK_CONN_ISBOUND_SET( msc );
731
732 } else {
733 LDAP_BACK_CONN_ISANON_SET( msc );
734 }
735
736 /* when bound, dispose of the "binding" flag */
737 if ( binding ) {
738 LDAP_BACK_CONN_BINDING_CLEAR( msc );
739 }
740 }
741 }
742
743 /* don't send twice */
744 sendok &= ~LDAP_BACK_SENDERR;
745 }
746
747 if ( rc != LDAP_SUCCESS ) {
748 SlapReply *candidates = meta_back_candidates_get( op );
749
750 candidates[ candidate ].sr_err = rc;
751
752 if ( *mcp != NULL ) {
753 if ( mc->mc_refcnt == 1 ) {
754 if ( binding ) {
755 LDAP_BACK_CONN_BINDING_CLEAR( msc );
756 }
757 (void)meta_clear_one_candidate( op, mc, candidate );
758 }
759
760 LDAP_BACK_CONN_TAINTED_SET( mc );
761 /* only release if mandatory; otherwise
762 * let the caller do what's best before
763 * releasing */
764 if ( META_BACK_ONERR_STOP( mi ) ) {
765 meta_back_release_conn_lock( mi, mc, 0 );
766 *mcp = NULL;
767
768 } else {
769 #if META_BACK_PRINT_CONNTREE > 0
770 meta_back_print_conntree( mi, ">>> meta_back_retry" );
771 #endif /* META_BACK_PRINT_CONNTREE */
772
773 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */
774 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
775 if ( mc->mc_q.tqe_prev != NULL ) {
776 assert( LDAP_BACK_CONN_CACHED( mc ) );
777 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
778 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
779 mc, mc_q );
780 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
781 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
782
783 } else {
784 assert( !LDAP_BACK_CONN_CACHED( mc ) );
785 }
786
787 } else {
788 /* FIXME: check if in tree, for consistency? */
789 (void)avl_delete( &mi->mi_conninfo.lai_tree,
790 ( caddr_t )mc, meta_back_conndnmc_cmp );
791 }
792 LDAP_BACK_CONN_CACHED_CLEAR( mc );
793
794 #if META_BACK_PRINT_CONNTREE > 0
795 meta_back_print_conntree( mi, "<<< meta_back_retry" );
796 #endif /* META_BACK_PRINT_CONNTREE */
797 }
798 }
799
800 if ( sendok & LDAP_BACK_SENDERR ) {
801 rs->sr_err = rc;
802 rs->sr_text = "Unable to retry";
803 send_ldap_result( op, rs );
804 }
805 }
806
807 if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) {
808 meta_back_quarantine( op, rs, candidate );
809 }
810
811 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
812
813 return rc == LDAP_SUCCESS ? 1 : 0;
814 }
815
816 /*
817 * callback for unique candidate selection
818 */
819 static int
820 meta_back_conn_cb( Operation *op, SlapReply *rs )
821 {
822 assert( op->o_tag == LDAP_REQ_SEARCH );
823
824 switch ( rs->sr_type ) {
825 case REP_SEARCH:
826 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
827 break;
828
829 case REP_SEARCHREF:
830 case REP_RESULT:
831 break;
832
833 default:
834 return rs->sr_err;
835 }
836
837 return 0;
838 }
839
840
841 static int
842 meta_back_get_candidate(
843 Operation *op,
844 SlapReply *rs,
845 struct berval *ndn )
846 {
847 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
848 long candidate;
849
850 /*
851 * tries to get a unique candidate
852 * (takes care of default target)
853 */
854 candidate = meta_back_select_unique_candidate( mi, ndn );
855
856 /*
857 * if any is found, inits the connection
858 */
859 if ( candidate == META_TARGET_NONE ) {
860 rs->sr_err = LDAP_NO_SUCH_OBJECT;
861 rs->sr_text = "No suitable candidate target found";
862
863 } else if ( candidate == META_TARGET_MULTIPLE ) {
864 Operation op2 = *op;
865 SlapReply rs2 = { 0 };
866 slap_callback cb2 = { 0 };
867 int rc;
868
869 /* try to get a unique match for the request ndn
870 * among the multiple candidates available */
871 op2.o_tag = LDAP_REQ_SEARCH;
872 op2.o_req_dn = *ndn;
873 op2.o_req_ndn = *ndn;
874 op2.ors_scope = LDAP_SCOPE_BASE;
875 op2.ors_deref = LDAP_DEREF_NEVER;
876 op2.ors_attrs = slap_anlist_no_attrs;
877 op2.ors_attrsonly = 0;
878 op2.ors_limit = NULL;
879 op2.ors_slimit = 1;
880 op2.ors_tlimit = SLAP_NO_LIMIT;
881
882 op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
883 op2.ors_filterstr = *slap_filterstr_objectClass_pres;
884
885 op2.o_callback = &cb2;
886 cb2.sc_response = meta_back_conn_cb;
887 cb2.sc_private = (void *)&candidate;
888
889 rc = op->o_bd->be_search( &op2, &rs2 );
890
891 switch ( rs2.sr_err ) {
892 case LDAP_SUCCESS:
893 default:
894 rs->sr_err = rs2.sr_err;
895 break;
896
897 case LDAP_SIZELIMIT_EXCEEDED:
898 /* if multiple candidates can serve the operation,
899 * and a default target is defined, and it is
900 * a candidate, try using it (FIXME: YMMV) */
901 if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
902 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
903 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
904 {
905 candidate = mi->mi_defaulttarget;
906 rs->sr_err = LDAP_SUCCESS;
907 rs->sr_text = NULL;
908
909 } else {
910 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
911 rs->sr_text = "Unable to select unique candidate target";
912 }
913 break;
914 }
915
916 } else {
917 rs->sr_err = LDAP_SUCCESS;
918 }
919
920 return candidate;
921 }
922
923 static void *meta_back_candidates_dummy;
924
925 static void
926 meta_back_candidates_keyfree(
927 void *key,
928 void *data )
929 {
930 metacandidates_t *mc = (metacandidates_t *)data;
931
932 ber_memfree_x( mc->mc_candidates, NULL );
933 ber_memfree_x( data, NULL );
934 }
935
936 SlapReply *
937 meta_back_candidates_get( Operation *op )
938 {
939 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
940 metacandidates_t *mc;
941
942 if ( op->o_threadctx ) {
943 void *data = NULL;
944
945 ldap_pvt_thread_pool_getkey( op->o_threadctx,
946 &meta_back_candidates_dummy, &data, NULL );
947 mc = (metacandidates_t *)data;
948
949 } else {
950 mc = mi->mi_candidates;
951 }
952
953 if ( mc == NULL ) {
954 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
955 mc->mc_ntargets = mi->mi_ntargets;
956 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
957 if ( op->o_threadctx ) {
958 void *data = NULL;
959
960 data = (void *)mc;
961 ldap_pvt_thread_pool_setkey( op->o_threadctx,
962 &meta_back_candidates_dummy, data,
963 meta_back_candidates_keyfree,
964 NULL, NULL );
965
966 } else {
967 mi->mi_candidates = mc;
968 }
969
970 } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
971 /* NOTE: in the future, may want to allow back-config
972 * to add/remove targets from back-meta... */
973 mc->mc_candidates = ch_realloc( mc->mc_candidates,
974 sizeof( SlapReply ) * mi->mi_ntargets );
975 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
976 sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
977 mc->mc_ntargets = mi->mi_ntargets;
978 }
979
980 return mc->mc_candidates;
981 }
982
983 /*
984 * meta_back_getconn
985 *
986 * Prepares the connection structure
987 *
988 * RATIONALE:
989 *
990 * - determine what DN is being requested:
991 *
992 * op requires candidate checks
993 *
994 * add unique parent of o_req_ndn
995 * bind unique^*[/all] o_req_ndn [no check]
996 * compare unique^+ o_req_ndn
997 * delete unique o_req_ndn
998 * modify unique o_req_ndn
999 * search any o_req_ndn
1000 * modrdn unique[, unique] o_req_ndn[, orr_nnewSup]
1001 *
1002 * - for ops that require the candidate to be unique, in case of multiple
1003 * occurrences an internal search with sizeLimit=1 is performed
1004 * if a unique candidate can actually be determined. If none is found,
1005 * the operation aborts; if multiple are found, the default target
1006 * is used if defined and candidate; otherwise the operation aborts.
1007 *
1008 * *^note: actually, the bind operation is handled much like a search;
1009 * i.e. the bind is broadcast to all candidate targets.
1010 *
1011 * +^note: actually, the compare operation is handled much like a search;
1012 * i.e. the compare is broadcast to all candidate targets, while checking
1013 * that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
1014 * returned.
1015 */
1016 metaconn_t *
1017 meta_back_getconn(
1018 Operation *op,
1019 SlapReply *rs,
1020 int *candidate,
1021 ldap_back_send_t sendok )
1022 {
1023 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
1024 metaconn_t *mc = NULL,
1025 mc_curr = { 0 };
1026 int cached = META_TARGET_NONE,
1027 i = META_TARGET_NONE,
1028 err = LDAP_SUCCESS,
1029 new_conn = 0,
1030 ncandidates = 0;
1031
1032
1033 meta_op_type op_type = META_OP_REQUIRE_SINGLE;
1034 enum {
1035 META_DNTYPE_ENTRY,
1036 META_DNTYPE_PARENT,
1037 META_DNTYPE_NEWPARENT
1038 } dn_type = META_DNTYPE_ENTRY;
1039 struct berval ndn = op->o_req_ndn,
1040 pndn;
1041
1042 SlapReply *candidates = meta_back_candidates_get( op );
1043
1044 /* Internal searches are privileged and shared. So is root. */
1045 if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) )
1046 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) )
1047 || op->o_do_not_cache || be_isroot( op ) )
1048 {
1049 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
1050 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
1051 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op );
1052
1053 } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) )
1054 {
1055 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1056 BER_BVSTR( &mc_curr.mc_local_ndn, "" );
1057 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1058
1059 } else {
1060 mc_curr.mc_local_ndn = op->o_ndn;
1061
1062 /* Explicit binds must not be shared */
1063 if ( !BER_BVISEMPTY( &op->o_ndn )
1064 || op->o_tag == LDAP_REQ_BIND
1065 || SLAP_IS_AUTHZ_BACKEND( op ) )
1066 {
1067 mc_curr.mc_conn = op->o_conn;
1068
1069 } else {
1070 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1071 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1072 }
1073 }
1074
1075 /* Explicit Bind requests always get their own conn */
1076 if ( sendok & LDAP_BACK_BINDING ) {
1077 mc_curr.mc_conn = op->o_conn;
1078
1079 } else {
1080 /* Searches for a metaconn in the avl tree */
1081 retry_lock:;
1082 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1083 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) {
1084 /* lookup a conn that's not binding */
1085 LDAP_TAILQ_FOREACH( mc,
1086 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv,
1087 mc_q )
1088 {
1089 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) {
1090 break;
1091 }
1092 }
1093
1094 if ( mc != NULL ) {
1095 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1096 metaconn_t, mc_q ) )
1097 {
1098 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1099 mc, mc_q );
1100 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1101 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1102 mc, mc_q );
1103 }
1104
1105 } else if ( !LDAP_BACK_USE_TEMPORARIES( mi )
1106 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max )
1107 {
1108 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv );
1109 }
1110
1111
1112 } else {
1113 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1114 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1115 }
1116
1117 if ( mc ) {
1118 /* catch taint errors */
1119 assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1120
1121 /* Don't reuse connections while they're still binding
1122 * NOTE: only makes sense for binds */
1123 if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1124 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1125 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1126
1127 ldap_pvt_thread_yield();
1128 goto retry_lock;
1129 }
1130
1131 /* release conn, and create a temporary */
1132 mc = NULL;
1133
1134 } else {
1135 if ( ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1136 || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
1137 {
1138 #if META_BACK_PRINT_CONNTREE > 0
1139 meta_back_print_conntree( mi,
1140 ">>> meta_back_getconn(expired)" );
1141 #endif /* META_BACK_PRINT_CONNTREE */
1142
1143 /* don't let anyone else use this expired connection */
1144 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1145 if ( mc->mc_q.tqe_prev != NULL ) {
1146 assert( LDAP_BACK_CONN_CACHED( mc ) );
1147 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1148 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1149 mc, mc_q );
1150 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1151 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1152
1153 } else {
1154 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1155 }
1156
1157 } else {
1158 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1159 (caddr_t)mc, meta_back_conndnmc_cmp );
1160 }
1161
1162 #if META_BACK_PRINT_CONNTREE > 0
1163 meta_back_print_conntree( mi,
1164 "<<< meta_back_getconn(expired)" );
1165 #endif /* META_BACK_PRINT_CONNTREE */
1166 LDAP_BACK_CONN_TAINTED_SET( mc );
1167 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1168
1169 Debug( LDAP_DEBUG_TRACE, "%s meta_back_getconn: mc=%p conn=%ld expired (tainted).\n",
1170 op->o_log_prefix, (void *)mc, LDAP_BACK_PCONN_ID( mc ) );
1171 }
1172
1173 mc->mc_refcnt++;
1174 }
1175 }
1176 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1177 }
1178
1179 switch ( op->o_tag ) {
1180 case LDAP_REQ_ADD:
1181 /* if we go to selection, the entry must not exist,
1182 * and we must be able to resolve the parent */
1183 dn_type = META_DNTYPE_PARENT;
1184 dnParent( &ndn, &pndn );
1185 break;
1186
1187 case LDAP_REQ_MODRDN:
1188 /* if nnewSuperior is not NULL, it must resolve
1189 * to the same candidate as the req_ndn */
1190 if ( op->orr_nnewSup ) {
1191 dn_type = META_DNTYPE_NEWPARENT;
1192 }
1193 break;
1194
1195 case LDAP_REQ_BIND:
1196 /* if bound as rootdn, the backend must bind to all targets
1197 * with the administrative identity
1198 * (unless pseoudoroot-bind-defer is TRUE) */
1199 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
1200 op_type = META_OP_REQUIRE_ALL;
1201 }
1202 break;
1203
1204 case LDAP_REQ_COMPARE:
1205 case LDAP_REQ_DELETE:
1206 case LDAP_REQ_MODIFY:
1207 /* just a unique candidate */
1208 break;
1209
1210 case LDAP_REQ_SEARCH:
1211 /* allow multiple candidates for the searchBase */
1212 op_type = META_OP_ALLOW_MULTIPLE;
1213 break;
1214
1215 default:
1216 /* right now, just break (exop?) */
1217 break;
1218 }
1219
1220 /*
1221 * require all connections ...
1222 */
1223 if ( op_type == META_OP_REQUIRE_ALL ) {
1224
1225 /* Looks like we didn't get a bind. Open a new session... */
1226 if ( mc == NULL ) {
1227 assert( new_conn == 0 );
1228 mc = metaconn_alloc( op );
1229 mc->mc_conn = mc_curr.mc_conn;
1230 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1231 new_conn = 1;
1232 if ( sendok & LDAP_BACK_BINDING ) {
1233 LDAP_BACK_CONN_BINDING_SET( mc );
1234 }
1235 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1236 LDAP_BACK_CONN_ISPRIV_SET( mc );
1237
1238 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1239 LDAP_BACK_CONN_ISANON_SET( mc );
1240 }
1241
1242 } else if ( 0 ) {
1243 /* TODO: if any of the connections is binding,
1244 * release mc and create a new one */
1245 }
1246
1247 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1248 /*
1249 * The target is activated; if needed, it is
1250 * also init'd
1251 */
1252 candidates[ i ].sr_err = meta_back_init_one_conn( op,
1253 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1254 LDAP_BACK_DONTSEND, !new_conn );
1255 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1256 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1257 LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1258 }
1259 META_CANDIDATE_SET( &candidates[ i ] );
1260 ncandidates++;
1261
1262 } else {
1263
1264 /*
1265 * FIXME: in case one target cannot
1266 * be init'd, should the other ones
1267 * be tried?
1268 */
1269 META_CANDIDATE_RESET( &candidates[ i ] );
1270 err = candidates[ i ].sr_err;
1271 continue;
1272 }
1273 }
1274
1275 if ( ncandidates == 0 ) {
1276 if ( new_conn ) {
1277 mc->mc_refcnt = 0;
1278 meta_back_conn_free( mc );
1279
1280 } else {
1281 meta_back_release_conn( mi, mc );
1282 }
1283
1284 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1285 rs->sr_text = "Unable to select valid candidates";
1286
1287 if ( sendok & LDAP_BACK_SENDERR ) {
1288 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1289 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1290 }
1291 send_ldap_result( op, rs );
1292 rs->sr_matched = NULL;
1293 }
1294
1295 return NULL;
1296 }
1297
1298 goto done;
1299 }
1300
1301 /*
1302 * looks in cache, if any
1303 */
1304 if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1305 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1306 }
1307
1308 if ( op_type == META_OP_REQUIRE_SINGLE ) {
1309 metatarget_t *mt = NULL;
1310 metasingleconn_t *msc = NULL;
1311
1312 int j;
1313
1314 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1315 META_CANDIDATE_RESET( &candidates[ j ] );
1316 }
1317
1318 /*
1319 * tries to get a unique candidate
1320 * (takes care of default target)
1321 */
1322 if ( i == META_TARGET_NONE ) {
1323 i = meta_back_get_candidate( op, rs, &ndn );
1324
1325 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1326 i = meta_back_get_candidate( op, rs, &pndn );
1327 }
1328
1329 if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1330 if ( mc != NULL ) {
1331 meta_back_release_conn( mi, mc );
1332 }
1333
1334 if ( sendok & LDAP_BACK_SENDERR ) {
1335 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1336 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1337 }
1338 send_ldap_result( op, rs );
1339 rs->sr_matched = NULL;
1340 }
1341
1342 return NULL;
1343 }
1344 }
1345
1346 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1347 {
1348 if ( mc != NULL ) {
1349 meta_back_release_conn( mi, mc );
1350 }
1351
1352 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1353 rs->sr_text = "Cross-target rename not supported";
1354 if ( sendok & LDAP_BACK_SENDERR ) {
1355 send_ldap_result( op, rs );
1356 }
1357
1358 return NULL;
1359 }
1360
1361 Debug( LDAP_DEBUG_TRACE,
1362 "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1363 i, op->o_req_ndn.bv_val, 0 );
1364
1365 if ( mc == NULL ) {
1366 /* Retries searching for a metaconn in the avl tree
1367 * the reason is that the connection might have been
1368 * created by meta_back_get_candidate() */
1369 if ( !( sendok & LDAP_BACK_BINDING ) ) {
1370 retry_lock2:;
1371 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1372 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1373 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1374 if ( mc != NULL ) {
1375 /* catch taint errors */
1376 assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1377
1378 /* Don't reuse connections while they're still binding */
1379 if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] )
1380 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) )
1381 {
1382 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1383 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1384 ldap_pvt_thread_yield();
1385 goto retry_lock2;
1386 }
1387
1388 mc = NULL;
1389
1390 } else {
1391 mc->mc_refcnt++;
1392 }
1393 }
1394 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1395 }
1396
1397 /* Looks like we didn't get a bind. Open a new session... */
1398 if ( mc == NULL ) {
1399 assert( new_conn == 0 );
1400 mc = metaconn_alloc( op );
1401 mc->mc_conn = mc_curr.mc_conn;
1402 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1403 new_conn = 1;
1404 if ( sendok & LDAP_BACK_BINDING ) {
1405 LDAP_BACK_CONN_BINDING_SET( mc );
1406 }
1407 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1408 LDAP_BACK_CONN_ISPRIV_SET( mc );
1409
1410 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1411 LDAP_BACK_CONN_ISANON_SET( mc );
1412 }
1413 }
1414 }
1415
1416 /*
1417 * Clear all other candidates
1418 */
1419 ( void )meta_clear_unused_candidates( op, i );
1420
1421 mt = mi->mi_targets[ i ];
1422 msc = &mc->mc_conns[ i ];
1423
1424 /*
1425 * The target is activated; if needed, it is
1426 * also init'd. In case of error, meta_back_init_one_conn
1427 * sends the appropriate result.
1428 */
1429 err = meta_back_init_one_conn( op, rs, mc, i,
1430 LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn );
1431 if ( err != LDAP_SUCCESS ) {
1432 /*
1433 * FIXME: in case one target cannot
1434 * be init'd, should the other ones
1435 * be tried?
1436 */
1437 META_CANDIDATE_RESET( &candidates[ i ] );
1438 if ( new_conn ) {
1439 mc->mc_refcnt = 0;
1440 meta_back_conn_free( mc );
1441
1442 } else {
1443 meta_back_release_conn( mi, mc );
1444 }
1445 return NULL;
1446 }
1447
1448 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1449 LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1450 }
1451
1452 candidates[ i ].sr_err = LDAP_SUCCESS;
1453 META_CANDIDATE_SET( &candidates[ i ] );
1454 ncandidates++;
1455
1456 if ( candidate ) {
1457 *candidate = i;
1458 }
1459
1460 /*
1461 * if no unique candidate ...
1462 */
1463 } else {
1464
1465 /* Looks like we didn't get a bind. Open a new session... */
1466 if ( mc == NULL ) {
1467 assert( new_conn == 0 );
1468 mc = metaconn_alloc( op );
1469 mc->mc_conn = mc_curr.mc_conn;
1470 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1471 new_conn = 1;
1472 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1473 LDAP_BACK_CONN_ISPRIV_SET( mc );
1474
1475 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1476 LDAP_BACK_CONN_ISANON_SET( mc );
1477 }
1478 }
1479
1480 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1481 metatarget_t *mt = mi->mi_targets[ i ];
1482
1483 META_CANDIDATE_RESET( &candidates[ i ] );
1484
1485 if ( i == cached
1486 || meta_back_is_candidate( mt, &op->o_req_ndn,
1487 LDAP_SCOPE_SUBTREE ) )
1488 {
1489
1490 /*
1491 * The target is activated; if needed, it is
1492 * also init'd
1493 */
1494 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1495 LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1496 LDAP_BACK_DONTSEND, !new_conn );
1497 candidates[ i ].sr_err = lerr;
1498 if ( lerr == LDAP_SUCCESS ) {
1499 META_CANDIDATE_SET( &candidates[ i ] );
1500 ncandidates++;
1501
1502 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1503 op->o_log_prefix, i, 0 );
1504
1505 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1506 META_CANDIDATE_SET( &candidates[ i ] );
1507
1508 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1509 op->o_log_prefix, i,
1510 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1511
1512 } else {
1513
1514 /*
1515 * FIXME: in case one target cannot
1516 * be init'd, should the other ones
1517 * be tried?
1518 */
1519 if ( new_conn ) {
1520 ( void )meta_clear_one_candidate( op, mc, i );
1521 }
1522 /* leave the target candidate, but record the error for later use */
1523 err = lerr;
1524
1525 if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1526 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined err=%d\n",
1527 op->o_log_prefix, i, lerr );
1528
1529 } else {
1530 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed err=%d\n",
1531 op->o_log_prefix, i, lerr );
1532 }
1533
1534 if ( META_BACK_ONERR_STOP( mi ) ) {
1535 if ( sendok & LDAP_BACK_SENDERR ) {
1536 send_ldap_result( op, rs );
1537 }
1538 if ( new_conn ) {
1539 mc->mc_refcnt = 0;
1540 meta_back_conn_free( mc );
1541
1542 } else {
1543 meta_back_release_conn( mi, mc );
1544 }
1545
1546 return NULL;
1547 }
1548
1549 continue;
1550 }
1551
1552 } else {
1553 if ( new_conn ) {
1554 ( void )meta_clear_one_candidate( op, mc, i );
1555 }
1556 }
1557 }
1558
1559 if ( ncandidates == 0 ) {
1560 if ( new_conn ) {
1561 mc->mc_refcnt = 0;
1562 meta_back_conn_free( mc );
1563
1564 } else {
1565 meta_back_release_conn( mi, mc );
1566 }
1567
1568 if ( rs->sr_err == LDAP_SUCCESS ) {
1569 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1570 rs->sr_text = "Unable to select valid candidates";
1571 }
1572
1573 if ( sendok & LDAP_BACK_SENDERR ) {
1574 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1575 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1576 }
1577 send_ldap_result( op, rs );
1578 rs->sr_matched = NULL;
1579 }
1580
1581 return NULL;
1582 }
1583 }
1584
1585 done:;
1586 /* clear out meta_back_init_one_conn non-fatal errors */
1587 rs->sr_err = LDAP_SUCCESS;
1588 rs->sr_text = NULL;
1589
1590 /* touch the timestamp */
1591 if ( mi->mi_idle_timeout != 0 ) {
1592 mc->mc_time = op->o_time;
1593 }
1594
1595 if ( new_conn ) {
1596 if ( mi->mi_conn_ttl ) {
1597 mc->mc_create_time = op->o_time;
1598 }
1599
1600 /*
1601 * Inserts the newly created metaconn in the avl tree
1602 */
1603 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1604 #if META_BACK_PRINT_CONNTREE > 0
1605 meta_back_print_conntree( mi, ">>> meta_back_getconn" );
1606 #endif /* META_BACK_PRINT_CONNTREE */
1607
1608 err = 0;
1609 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1610 if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) {
1611 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1612 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++;
1613 LDAP_BACK_CONN_CACHED_SET( mc );
1614
1615 } else {
1616 LDAP_BACK_CONN_TAINTED_SET( mc );
1617 }
1618 rs->sr_err = 0;
1619
1620 } else if ( !( sendok & LDAP_BACK_BINDING ) ) {
1621 err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1622 meta_back_conndn_cmp, meta_back_conndn_dup );
1623 LDAP_BACK_CONN_CACHED_SET( mc );
1624 }
1625
1626 #if META_BACK_PRINT_CONNTREE > 0
1627 meta_back_print_conntree( mi, "<<< meta_back_getconn" );
1628 #endif /* META_BACK_PRINT_CONNTREE */
1629 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1630
1631 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1632 /*
1633 * Err could be -1 in case a duplicate metaconn is inserted
1634 */
1635 switch ( err ) {
1636 case 0:
1637 break;
1638
1639 case -1:
1640 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1641 /* duplicate: free and try to get the newly created one */
1642 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1643 mc->mc_refcnt = 0;
1644 meta_back_conn_free( mc );
1645
1646 new_conn = 0;
1647 goto retry_lock;
1648 }
1649
1650 LDAP_BACK_CONN_TAINTED_SET( mc );
1651 break;
1652
1653 default:
1654 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1655 Debug( LDAP_DEBUG_ANY,
1656 "%s meta_back_getconn: candidates=%d conn=%ld insert failed\n",
1657 op->o_log_prefix, ncandidates,
1658 LDAP_BACK_PCONN_ID( mc ) );
1659
1660 mc->mc_refcnt = 0;
1661 meta_back_conn_free( mc );
1662
1663 rs->sr_err = LDAP_OTHER;
1664 rs->sr_text = "Proxy bind collision";
1665 if ( sendok & LDAP_BACK_SENDERR ) {
1666 send_ldap_result( op, rs );
1667 }
1668 return NULL;
1669 }
1670 }
1671
1672 Debug( LDAP_DEBUG_TRACE,
1673 "%s meta_back_getconn: candidates=%d conn=%ld inserted\n",
1674 op->o_log_prefix, ncandidates,
1675 LDAP_BACK_PCONN_ID( mc ) );
1676
1677 } else {
1678 Debug( LDAP_DEBUG_TRACE,
1679 "%s meta_back_getconn: candidates=%d conn=%ld fetched\n",
1680 op->o_log_prefix, ncandidates,
1681 LDAP_BACK_PCONN_ID( mc ) );
1682 }
1683
1684 return mc;
1685 }
1686
1687 void
1688 meta_back_release_conn_lock(
1689 metainfo_t *mi,
1690 metaconn_t *mc,
1691 int dolock )
1692 {
1693 assert( mc != NULL );
1694
1695 if ( dolock ) {
1696 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1697 }
1698 assert( mc->mc_refcnt > 0 );
1699 mc->mc_refcnt--;
1700 /* NOTE: the connection is removed if either it is tainted
1701 * or if it is shared and no one else is using it. This needs
1702 * to occur because for intrinsic reasons cached connections
1703 * that are not privileged would live forever and pollute
1704 * the connection space (and eat up resources). Maybe this
1705 * should be configurable... */
1706 if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) {
1707 #if META_BACK_PRINT_CONNTREE > 0
1708 meta_back_print_conntree( mi, ">>> meta_back_release_conn" );
1709 #endif /* META_BACK_PRINT_CONNTREE */
1710
1711 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1712 if ( mc->mc_q.tqe_prev != NULL ) {
1713 assert( LDAP_BACK_CONN_CACHED( mc ) );
1714 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1715 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1716 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1717 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1718
1719 } else {
1720 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1721 }
1722
1723 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) {
1724 metaconn_t *tmpmc;
1725
1726 tmpmc = avl_delete( &mi->mi_conninfo.lai_tree,
1727 ( caddr_t )mc, meta_back_conndnmc_cmp );
1728
1729 /* Overparanoid, but useful... */
1730 assert( tmpmc == NULL || tmpmc == mc );
1731 }
1732
1733 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1734
1735 #if META_BACK_PRINT_CONNTREE > 0
1736 meta_back_print_conntree( mi, "<<< meta_back_release_conn" );
1737 #endif /* META_BACK_PRINT_CONNTREE */
1738
1739 if ( mc->mc_refcnt == 0 ) {
1740 meta_back_conn_free( mc );
1741 mc = NULL;
1742 }
1743 }
1744
1745 if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) {
1746 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1747 }
1748
1749 if ( dolock ) {
1750 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1751 }
1752 }
1753
1754 void
1755 meta_back_quarantine(
1756 Operation *op,
1757 SlapReply *rs,
1758 int candidate )
1759 {
1760 metainfo_t *mi = (metainfo_t *)op->o_bd->be_private;
1761 metatarget_t *mt = mi->mi_targets[ candidate ];
1762
1763 slap_retry_info_t *ri = &mt->mt_quarantine;
1764
1765 ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1766
1767 if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1768 time_t new_last = slap_get_time();
1769
1770 switch ( mt->mt_isquarantined ) {
1771 case LDAP_BACK_FQ_NO:
1772 if ( ri->ri_last == new_last ) {
1773 goto done;
1774 }
1775
1776 Debug( LDAP_DEBUG_ANY,
1777 "%s meta_back_quarantine[%d]: enter.\n",
1778 op->o_log_prefix, candidate, 0 );
1779
1780 ri->ri_idx = 0;
1781 ri->ri_count = 0;
1782 break;
1783
1784 case LDAP_BACK_FQ_RETRYING:
1785 if ( LogTest( LDAP_DEBUG_ANY ) ) {
1786 char buf[ SLAP_TEXT_BUFLEN ];
1787
1788 snprintf( buf, sizeof( buf ),
1789 "meta_back_quarantine[%d]: block #%d try #%d failed",
1790 candidate, ri->ri_idx, ri->ri_count );
1791 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1792 op->o_log_prefix, buf, 0 );
1793 }
1794
1795 ++ri->ri_count;
1796 if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1797 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1798 {
1799 ri->ri_count = 0;
1800 ++ri->ri_idx;
1801 }
1802 break;
1803
1804 default:
1805 break;
1806 }
1807
1808 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1809 ri->ri_last = new_last;
1810
1811 } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1812 Debug( LDAP_DEBUG_ANY,
1813 "%s meta_back_quarantine[%d]: exit.\n",
1814 op->o_log_prefix, candidate, 0 );
1815
1816 if ( mi->mi_quarantine_f ) {
1817 (void)mi->mi_quarantine_f( mi, candidate,
1818 mi->mi_quarantine_p );
1819 }
1820
1821 ri->ri_count = 0;
1822 ri->ri_idx = 0;
1823 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1824 }
1825
1826 done:;
1827 ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
1828 }
1829
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