git.sur5r.net Git - openldap/blob - servers/slapd/back-meta/conn.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1999-2013 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         int                     do_start_tls = 0;
 285 #endif /* HAVE_TLS */
 286
 287         /* if the server is quarantined, and
 288          * - the current interval did not expire yet, or
 289          * - no more retries should occur,
 290          * don't return the connection */
 291         if ( mt->mt_isquarantined ) {
 292                 slap_retry_info_t       *ri = &mt->mt_quarantine;
 293                 int                     dont_retry = 0;
 294
 295                 if ( mt->mt_quarantine.ri_interval ) {
 296                         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
 297                         dont_retry = ( mt->mt_isquarantined > LDAP_BACK_FQ_NO );
 298                         if ( dont_retry ) {
 299                                 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 300                                         || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 301                                 if ( !dont_retry ) {
 302                                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
 303                                                 char    buf[ SLAP_TEXT_BUFLEN ];
 304
 305                                                 snprintf( buf, sizeof( buf ),
 306                                                         "meta_back_init_one_conn[%d]: quarantine "
 307                                                         "retry block #%d try #%d",
 308                                                         candidate, ri->ri_idx, ri->ri_count );
 309                                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
 310                                                         op->o_log_prefix, buf, 0 );
 311                                         }
 312
 313                                         mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING;
 314                                 }
 315
 316                         }
 317                         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
 318                 }
 319
 320                 if ( dont_retry ) {
 321                         rs->sr_err = LDAP_UNAVAILABLE;
 322                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 323                                 rs->sr_text = "Target is quarantined";
 324                                 send_ldap_result( op, rs );
 325                         }
 326                         return rs->sr_err;
 327                 }
 328         }
 329
 330 retry_lock:;
 331         if ( dolock ) {
 332                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 333         }
 334
 335         /*
 336          * Already init'ed
 337          */
 338         if ( LDAP_BACK_CONN_ISBOUND( msc )
 339                 || LDAP_BACK_CONN_ISANON( msc ) )
 340         {
 341                 assert( msc->msc_ld != NULL );
 342                 rs->sr_err = LDAP_SUCCESS;
 343                 do_return = 1;
 344
 345         } else if ( META_BACK_CONN_CREATING( msc )
 346                 || LDAP_BACK_CONN_BINDING( msc ) )
 347         {
 348                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
 349                         if ( dolock ) {
 350                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 351                         }
 352
 353                         ldap_pvt_thread_yield();
 354                         goto retry_lock;
 355                 }
 356
 357                 /* sounds more appropriate */
 358                 rs->sr_err = LDAP_BUSY;
 359                 rs->sr_text = "No connections to target are available";
 360                 do_return = 1;
 361
 362         } else if ( META_BACK_CONN_INITED( msc ) ) {
 363                 assert( msc->msc_ld != NULL );
 364                 rs->sr_err = LDAP_SUCCESS;
 365                 do_return = 1;
 366
 367         } else {
 368                 /*
 369                  * creating...
 370                  */
 371                 META_BACK_CONN_CREATING_SET( msc );
 372         }
 373
 374         if ( dolock ) {
 375                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 376         }
 377
 378         if ( do_return ) {
 379                 if ( rs->sr_err != LDAP_SUCCESS
 380                         && op->o_conn
 381                         && ( sendok & LDAP_BACK_SENDERR ) )
 382                 {
 383                         send_ldap_result( op, rs );
 384                 }
 385
 386                 return rs->sr_err;
 387         }
 388
 389         assert( msc->msc_ld == NULL );
 390
 391         /*
 392          * Attempts to initialize the connection to the target ds
 393          */
 394         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 395         rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
 396 #ifdef HAVE_TLS
 397         is_ldaps = ldap_is_ldaps_url( mt->mt_uri );
 398 #endif /* HAVE_TLS */
 399         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 400         if ( rs->sr_err != LDAP_SUCCESS ) {
 401                 goto error_return;
 402         }
 403
 404         /*
 405          * Set LDAP version. This will always succeed: If the client
 406          * bound with a particular version, then so can we.
 407          */
 408         if ( mt->mt_version != 0 ) {
 409                 version = mt->mt_version;
 410
 411         } else if ( op->o_conn->c_protocol != 0 ) {
 412                 version = op->o_conn->c_protocol;
 413
 414         } else {
 415                 version = LDAP_VERSION3;
 416         }
 417         ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version );
 418         ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p );
 419
 420         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 421         ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
 422                 META_BACK_TGT_CHASE_REFERRALS( mt ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 423
 424         slap_client_keepalive(msc->msc_ld, &mt->mt_tls.sb_keepalive);
 425
 426 #ifdef HAVE_TLS
 427         if ( !is_ldaps ) {
 428                 slap_bindconf *sb = NULL;
 429
 430                 if ( ispriv ) {
 431                         sb = &mt->mt_idassert.si_bc;
 432                 } else {
 433                         sb = &mt->mt_tls;
 434                 }
 435
 436                 if ( sb->sb_tls_do_init ) {
 437                         bindconf_tls_set( sb, msc->msc_ld );
 438                 } else if ( sb->sb_tls_ctx ) {
 439                         ldap_set_option( msc->msc_ld, LDAP_OPT_X_TLS_CTX, sb->sb_tls_ctx );
 440                 }
 441
 442                 if ( sb == &mt->mt_idassert.si_bc && sb->sb_tls_ctx ) {
 443                         do_start_tls = 1;
 444
 445                 } else if ( META_BACK_TGT_USE_TLS( mt )
 446                         || ( op->o_conn->c_is_tls && META_BACK_TGT_PROPAGATE_TLS( mt ) ) )
 447                 {
 448                         do_start_tls = 1;
 449                 }
 450         }
 451
 452         /* start TLS ("tls [try-]{start|propagate}" statement) */
 453         if ( do_start_tls ) {
 454 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 455                 /*
 456                  * use asynchronous StartTLS; in case, chase referral
 457                  * FIXME: OpenLDAP does not return referral on StartTLS yet
 458                  */
 459                 int             msgid;
 460
 461                 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
 462                 if ( rs->sr_err == LDAP_SUCCESS ) {
 463                         LDAPMessage     *res = NULL;
 464                         int             rc, nretries = mt->mt_nretries;
 465                         struct timeval  tv;
 466
 467                         LDAP_BACK_TV_SET( &tv );
 468
 469 retry:;
 470                         rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 471                         switch ( rc ) {
 472                         case -1:
 473                                 rs->sr_err = LDAP_OTHER;
 474                                 break;
 475
 476                         case 0:
 477                                 if ( nretries != 0 ) {
 478                                         if ( nretries > 0 ) {
 479                                                 nretries--;
 480                                         }
 481                                         LDAP_BACK_TV_SET( &tv );
 482                                         goto retry;
 483                                 }
 484                                 rs->sr_err = LDAP_OTHER;
 485                                 break;
 486
 487                         default:
 488                                 /* only touch when activity actually took place... */
 489                                 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
 490                                         msc->msc_time = op->o_time;
 491                                 }
 492                                 break;
 493                         }
 494
 495                         if ( rc == LDAP_RES_EXTENDED ) {
 496                                 struct berval   *data = NULL;
 497
 498                                 /* NOTE: right now, data is unused, so don't get it */
 499                                 rs->sr_err = ldap_parse_extended_result( msc->msc_ld,
 500                                         res, NULL, NULL /* &data */ , 0 );
 501                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 502                                         int             err;
 503
 504                                         /* FIXME: matched? referrals? response controls? */
 505                                         rs->sr_err = ldap_parse_result( msc->msc_ld,
 506                                                 res, &err, NULL, NULL, NULL, NULL, 1 );
 507                                         res = NULL;
 508
 509                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 510                                                 rs->sr_err = err;
 511                                         }
 512                                         rs->sr_err = slap_map_api2result( rs );
 513
 514                                         /* FIXME: in case a referral
 515                                          * is returned, should we try
 516                                          * using it instead of the
 517                                          * configured URI? */
 518                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 519                                                 ldap_install_tls( msc->msc_ld );
 520
 521                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 522                                                 /* FIXME: LDAP_OPERATIONS_ERROR? */
 523                                                 rs->sr_err = LDAP_OTHER;
 524                                                 rs->sr_text = "Unwilling to chase referral "
 525                                                         "returned by Start TLS exop";
 526                                         }
 527
 528                                         if ( data ) {
 529                                                 ber_bvfree( data );
 530                                         }
 531                                 }
 532
 533                         } else {
 534                                 rs->sr_err = LDAP_OTHER;
 535                         }
 536
 537                         if ( res != NULL ) {
 538                                 ldap_msgfree( res );
 539                         }
 540                 }
 541 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 542                 /*
 543                  * use synchronous StartTLS
 544                  */
 545                 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
 546 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 547
 548                 /* if StartTLS is requested, only attempt it if the URL
 549                  * is not "ldaps://"; this may occur not only in case
 550                  * of misconfiguration, but also when used in the chain
 551                  * overlay, where the "uri" can be parsed out of a referral */
 552                 if ( rs->sr_err == LDAP_SERVER_DOWN
 553                         || ( rs->sr_err != LDAP_SUCCESS
 554                                 && META_BACK_TGT_TLS_CRITICAL( mt ) ) )
 555                 {
 556
 557 #ifdef DEBUG_205
 558                         Debug( LDAP_DEBUG_ANY,
 559                                 "### %s meta_back_init_one_conn(TLS) "
 560                                 "ldap_unbind_ext[%d] ld=%p\n",
 561                                 op->o_log_prefix, candidate,
 562                                 (void *)msc->msc_ld );
 563 #endif /* DEBUG_205 */
 564
 565                         /* need to trash a failed Start TLS */
 566                         meta_clear_one_candidate( op, mc, candidate );
 567                         goto error_return;
 568                 }
 569         }
 570 #endif /* HAVE_TLS */
 571
 572         /*
 573          * Set the network timeout if set
 574          */
 575         if ( mt->mt_network_timeout != 0 ) {
 576                 struct timeval  network_timeout;
 577
 578                 network_timeout.tv_usec = 0;
 579                 network_timeout.tv_sec = mt->mt_network_timeout;
 580
 581                 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
 582                                 (void *)&network_timeout );
 583         }
 584
 585         /*
 586          * If the connection DN is not null, an attempt to rewrite it is made
 587          */
 588
 589         if ( ispriv ) {
 590                 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
 591                         ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
 592                         if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
 593                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 594                                         memset( msc->msc_cred.bv_val, 0,
 595                                                 msc->msc_cred.bv_len );
 596                                 }
 597                                 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
 598                         }
 599                         LDAP_BACK_CONN_ISIDASSERT_SET( msc );
 600
 601                 } else {
 602                         ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
 603                 }
 604
 605         } else {
 606                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 607                         memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 608                         ber_memfree_x( msc->msc_cred.bv_val, NULL );
 609                         BER_BVZERO( &msc->msc_cred );
 610                 }
 611                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 612                         ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
 613                         BER_BVZERO( &msc->msc_bound_ndn );
 614                 }
 615                 if ( !BER_BVISEMPTY( &op->o_ndn )
 616                         && SLAP_IS_AUTHZ_BACKEND( op )
 617                         && isauthz )
 618                 {
 619                         dc.target = mt;
 620                         dc.conn = op->o_conn;
 621                         dc.rs = rs;
 622                         dc.ctx = "bindDN";
 623
 624                         /*
 625                          * Rewrite the bind dn if needed
 626                          */
 627                         if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
 628                                                 &msc->msc_bound_ndn ) )
 629                         {
 630
 631 #ifdef DEBUG_205
 632                                 Debug( LDAP_DEBUG_ANY,
 633                                         "### %s meta_back_init_one_conn(rewrite) "
 634                                         "ldap_unbind_ext[%d] ld=%p\n",
 635                                         op->o_log_prefix, candidate,
 636                                         (void *)msc->msc_ld );
 637 #endif /* DEBUG_205 */
 638
 639                                 /* need to trash a connection not fully established */
 640                                 meta_clear_one_candidate( op, mc, candidate );
 641                                 goto error_return;
 642                         }
 643
 644                         /* copy the DN if needed */
 645                         if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
 646                                 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
 647                         }
 648
 649                         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 650
 651                 } else {
 652                         ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
 653                 }
 654         }
 655
 656         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 657
 658 error_return:;
 659         if ( dolock ) {
 660                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 661         }
 662         META_BACK_CONN_CREATING_CLEAR( msc );
 663         if ( rs->sr_err == LDAP_SUCCESS ) {
 664                 /*
 665                  * Sets a cookie for the rewrite session
 666                  */
 667                 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
 668                 META_BACK_CONN_INITED_SET( msc );
 669         }
 670         if ( dolock ) {
 671                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 672         }
 673
 674         if ( rs->sr_err != LDAP_SUCCESS ) {
 675                 rs->sr_err = slap_map_api2result( rs );
 676                 if ( sendok & LDAP_BACK_SENDERR ) {
 677                         send_ldap_result( op, rs );
 678                 }
 679         }
 680
 681         return rs->sr_err;
 682 }
 683
 684 /*
 685  * meta_back_retry
 686  *
 687  * Retries one connection
 688  */
 689 int
 690 meta_back_retry(
 691         Operation               *op,
 692         SlapReply               *rs,
 693         metaconn_t              **mcp,
 694         int                     candidate,
 695         ldap_back_send_t        sendok )
 696 {
 697         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 698         metatarget_t            *mt = mi->mi_targets[ candidate ];
 699         metaconn_t              *mc = *mcp;
 700         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 701         int                     rc = LDAP_UNAVAILABLE,
 702                                 binding,
 703                                 quarantine = 1;
 704
 705         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 706
 707         assert( !META_BACK_CONN_CREATING( msc ) );
 708         binding = LDAP_BACK_CONN_BINDING( msc );
 709         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 710
 711         assert( mc->mc_refcnt > 0 );
 712         if ( mc->mc_refcnt == 1 ) {
 713                 struct berval save_cred;
 714
 715                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
 716                         char    buf[ SLAP_TEXT_BUFLEN ];
 717
 718                         /* this lock is required; however,
 719                          * it's invoked only when logging is on */
 720                         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 721                         snprintf( buf, sizeof( buf ),
 722                                 "retrying URI=\"%s\" DN=\"%s\"",
 723                                 mt->mt_uri,
 724                                 BER_BVISNULL( &msc->msc_bound_ndn ) ?
 725                                         "" : msc->msc_bound_ndn.bv_val );
 726                         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 727
 728                         Debug( LDAP_DEBUG_ANY,
 729                                 "%s meta_back_retry[%d]: %s.\n",
 730                                 op->o_log_prefix, candidate, buf );
 731                 }
 732
 733                 /* save credentials, if any, for later use;
 734                  * meta_clear_one_candidate() would free them */
 735                 save_cred = msc->msc_cred;
 736                 BER_BVZERO( &msc->msc_cred );
 737
 738                 meta_clear_one_candidate( op, mc, candidate );
 739                 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 740
 741                 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 742
 743                 /* mc here must be the regular mc, reset and ready for init */
 744                 rc = meta_back_init_one_conn( op, rs, mc, candidate,
 745                         LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 );
 746
 747                 /* restore credentials, if any and if needed;
 748                  * meta_back_init_one_conn() restores msc_bound_ndn, if any;
 749                  * if no msc_bound_ndn is restored, destroy credentials */
 750                 if ( !BER_BVISNULL( &msc->msc_bound_ndn )
 751                         && BER_BVISNULL( &msc->msc_cred ) )
 752                 {
 753                         msc->msc_cred = save_cred;
 754
 755                 } else if ( !BER_BVISNULL( &save_cred ) ) {
 756                         memset( save_cred.bv_val, 0, save_cred.bv_len );
 757                         ber_memfree_x( save_cred.bv_val, NULL );
 758                 }
 759
 760                 /* restore the "binding" flag, in case */
 761                 if ( binding ) {
 762                         LDAP_BACK_CONN_BINDING_SET( msc );
 763                 }
 764
 765                 if ( rc == LDAP_SUCCESS ) {
 766                         quarantine = 0;
 767                         LDAP_BACK_CONN_BINDING_SET( msc ); binding = 1;
 768                         rc = meta_back_single_dobind( op, rs, mcp, candidate,
 769                                 sendok, mt->mt_nretries, 0 );
 770
 771                         Debug( LDAP_DEBUG_ANY,
 772                                 "%s meta_back_retry[%d]: "
 773                                 "meta_back_single_dobind=%d\n",
 774                                 op->o_log_prefix, candidate, rc );
 775                         if ( rc == LDAP_SUCCESS ) {
 776                                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
 777                                         !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 778                                 {
 779                                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 780
 781                                 } else {
 782                                         LDAP_BACK_CONN_ISANON_SET( msc );
 783                                 }
 784
 785                                 /* when bound, dispose of the "binding" flag */
 786                                 if ( binding ) {
 787                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 788                                 }
 789                         }
 790                 }
 791
 792 #if 0   /* ITS#7591, following stmt drops needed result msgs */
 793                 /* don't send twice */
 794                 sendok &= ~LDAP_BACK_SENDERR;
 795 #endif
 796         }
 797
 798         if ( rc != LDAP_SUCCESS ) {
 799                 SlapReply               *candidates = meta_back_candidates_get( op );
 800
 801                 candidates[ candidate ].sr_err = rc;
 802
 803                 if ( *mcp != NULL ) {
 804                         if ( mc->mc_refcnt == 1 ) {
 805                                 if ( binding ) {
 806                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 807                                 }
 808                                 (void)meta_clear_one_candidate( op, mc, candidate );
 809                         }
 810
 811                         LDAP_BACK_CONN_TAINTED_SET( mc );
 812                         /* only release if mandatory; otherwise
 813                          * let the caller do what's best before
 814                          * releasing */
 815                         if ( META_BACK_ONERR_STOP( mi ) ) {
 816                                 meta_back_release_conn_lock( mi, mc, 0 );
 817                                 *mcp = NULL;
 818
 819                         } else {
 820 #if META_BACK_PRINT_CONNTREE > 0
 821                                 meta_back_print_conntree( mi, ">>> meta_back_retry" );
 822 #endif /* META_BACK_PRINT_CONNTREE */
 823
 824                                 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */
 825                                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
 826                                         if ( mc->mc_q.tqe_prev != NULL ) {
 827                                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
 828                                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
 829                                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
 830                                                         mc, mc_q );
 831                                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
 832                                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
 833
 834                                         } else {
 835                                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
 836                                         }
 837
 838                                 } else {
 839                                         /* FIXME: check if in tree, for consistency? */
 840                                         (void)avl_delete( &mi->mi_conninfo.lai_tree,
 841                                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
 842                                 }
 843                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
 844
 845 #if META_BACK_PRINT_CONNTREE > 0
 846                                 meta_back_print_conntree( mi, "<<< meta_back_retry" );
 847 #endif /* META_BACK_PRINT_CONNTREE */
 848                         }
 849                 }
 850
 851                 if ( sendok & LDAP_BACK_SENDERR ) {
 852                         rs->sr_err = rc;
 853                         rs->sr_text = "Unable to retry";
 854                         send_ldap_result( op, rs );
 855                 }
 856         }
 857
 858         if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) {
 859                 meta_back_quarantine( op, rs, candidate );
 860         }
 861
 862         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 863
 864         return rc == LDAP_SUCCESS ? 1 : 0;
 865 }
 866
 867 /*
 868  * callback for unique candidate selection
 869  */
 870 static int
 871 meta_back_conn_cb( Operation *op, SlapReply *rs )
 872 {
 873         assert( op->o_tag == LDAP_REQ_SEARCH );
 874
 875         switch ( rs->sr_type ) {
 876         case REP_SEARCH:
 877                 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
 878                 break;
 879
 880         case REP_SEARCHREF:
 881         case REP_RESULT:
 882                 break;
 883
 884         default:
 885                 return rs->sr_err;
 886         }
 887
 888         return 0;
 889 }
 890
 891
 892 static int
 893 meta_back_get_candidate(
 894         Operation       *op,
 895         SlapReply       *rs,
 896         struct berval   *ndn )
 897 {
 898         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 899         long            candidate;
 900
 901         /*
 902          * tries to get a unique candidate
 903          * (takes care of default target)
 904          */
 905         candidate = meta_back_select_unique_candidate( mi, ndn );
 906
 907         /*
 908          * if any is found, inits the connection
 909          */
 910         if ( candidate == META_TARGET_NONE ) {
 911                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 912                 rs->sr_text = "No suitable candidate target found";
 913
 914         } else if ( candidate == META_TARGET_MULTIPLE ) {
 915                 Operation       op2 = *op;
 916                 SlapReply       rs2 = { REP_RESULT };
 917                 slap_callback   cb2 = { 0 };
 918                 int             rc;
 919
 920                 /* try to get a unique match for the request ndn
 921                  * among the multiple candidates available */
 922                 op2.o_tag = LDAP_REQ_SEARCH;
 923                 op2.o_req_dn = *ndn;
 924                 op2.o_req_ndn = *ndn;
 925                 op2.ors_scope = LDAP_SCOPE_BASE;
 926                 op2.ors_deref = LDAP_DEREF_NEVER;
 927                 op2.ors_attrs = slap_anlist_no_attrs;
 928                 op2.ors_attrsonly = 0;
 929                 op2.ors_limit = NULL;
 930                 op2.ors_slimit = 1;
 931                 op2.ors_tlimit = SLAP_NO_LIMIT;
 932
 933                 op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
 934                 op2.ors_filterstr = *slap_filterstr_objectClass_pres;
 935
 936                 op2.o_callback = &cb2;
 937                 cb2.sc_response = meta_back_conn_cb;
 938                 cb2.sc_private = (void *)&candidate;
 939
 940                 rc = op->o_bd->be_search( &op2, &rs2 );
 941
 942                 switch ( rs2.sr_err ) {
 943                 case LDAP_SUCCESS:
 944                 default:
 945                         rs->sr_err = rs2.sr_err;
 946                         break;
 947
 948                 case LDAP_SIZELIMIT_EXCEEDED:
 949                         /* if multiple candidates can serve the operation,
 950                          * and a default target is defined, and it is
 951                          * a candidate, try using it (FIXME: YMMV) */
 952                         if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
 953                                 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
 954                                                 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
 955                         {
 956                                 candidate = mi->mi_defaulttarget;
 957                                 rs->sr_err = LDAP_SUCCESS;
 958                                 rs->sr_text = NULL;
 959
 960                         } else {
 961                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 962                                 rs->sr_text = "Unable to select unique candidate target";
 963                         }
 964                         break;
 965                 }
 966
 967         } else {
 968                 rs->sr_err = LDAP_SUCCESS;
 969         }
 970
 971         return candidate;
 972 }
 973
 974 static void     *meta_back_candidates_dummy;
 975
 976 static void
 977 meta_back_candidates_keyfree(
 978         void            *key,
 979         void            *data )
 980 {
 981         metacandidates_t        *mc = (metacandidates_t *)data;
 982
 983         ber_memfree_x( mc->mc_candidates, NULL );
 984         ber_memfree_x( data, NULL );
 985 }
 986
 987 SlapReply *
 988 meta_back_candidates_get( Operation *op )
 989 {
 990         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 991         metacandidates_t        *mc;
 992
 993         if ( op->o_threadctx ) {
 994                 void            *data = NULL;
 995
 996                 ldap_pvt_thread_pool_getkey( op->o_threadctx,
 997                                 &meta_back_candidates_dummy, &data, NULL );
 998                 mc = (metacandidates_t *)data;
 999
1000         } else {
1001                 mc = mi->mi_candidates;
1002         }
1003
1004         if ( mc == NULL ) {
1005                 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
1006                 mc->mc_ntargets = mi->mi_ntargets;
1007                 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
1008                 if ( op->o_threadctx ) {
1009                         void            *data = NULL;
1010
1011                         data = (void *)mc;
1012                         ldap_pvt_thread_pool_setkey( op->o_threadctx,
1013                                         &meta_back_candidates_dummy, data,
1014                                         meta_back_candidates_keyfree,
1015                                         NULL, NULL );
1016
1017                 } else {
1018                         mi->mi_candidates = mc;
1019                 }
1020
1021         } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
1022                 /* NOTE: in the future, may want to allow back-config
1023                  * to add/remove targets from back-meta... */
1024                 mc->mc_candidates = ch_realloc( mc->mc_candidates,
1025                                 sizeof( SlapReply ) * mi->mi_ntargets );
1026                 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
1027                         sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
1028                 mc->mc_ntargets = mi->mi_ntargets;
1029         }
1030
1031         return mc->mc_candidates;
1032 }
1033
1034 /*
1035  * meta_back_getconn
1036  *
1037  * Prepares the connection structure
1038  *
1039  * RATIONALE:
1040  *
1041  * - determine what DN is being requested:
1042  *
1043  *      op      requires candidate      checks
1044  *
1045  *      add     unique                  parent of o_req_ndn
1046  *      bind    unique^*[/all]          o_req_ndn [no check]
1047  *      compare unique^+                o_req_ndn
1048  *      delete  unique                  o_req_ndn
1049  *      modify  unique                  o_req_ndn
1050  *      search  any                     o_req_ndn
1051  *      modrdn  unique[, unique]        o_req_ndn[, orr_nnewSup]
1052  *
1053  * - for ops that require the candidate to be unique, in case of multiple
1054  *   occurrences an internal search with sizeLimit=1 is performed
1055  *   if a unique candidate can actually be determined.  If none is found,
1056  *   the operation aborts; if multiple are found, the default target
1057  *   is used if defined and candidate; otherwise the operation aborts.
1058  *
1059  * *^note: actually, the bind operation is handled much like a search;
1060  *   i.e. the bind is broadcast to all candidate targets.
1061  *
1062  * +^note: actually, the compare operation is handled much like a search;
1063  *   i.e. the compare is broadcast to all candidate targets, while checking
1064  *   that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
1065  *   returned.
1066  */
1067 metaconn_t *
1068 meta_back_getconn(
1069         Operation               *op,
1070         SlapReply               *rs,
1071         int                     *candidate,
1072         ldap_back_send_t        sendok )
1073 {
1074         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
1075         metaconn_t      *mc = NULL,
1076                         mc_curr = {{ 0 }};
1077         int             cached = META_TARGET_NONE,
1078                         i = META_TARGET_NONE,
1079                         err = LDAP_SUCCESS,
1080                         new_conn = 0,
1081                         ncandidates = 0;
1082
1083
1084         meta_op_type    op_type = META_OP_REQUIRE_SINGLE;
1085         enum            {
1086                 META_DNTYPE_ENTRY,
1087                 META_DNTYPE_PARENT,
1088                 META_DNTYPE_NEWPARENT
1089         }               dn_type = META_DNTYPE_ENTRY;
1090         struct berval   ndn = op->o_req_ndn,
1091                         pndn;
1092
1093         SlapReply       *candidates = meta_back_candidates_get( op );
1094
1095         /* Internal searches are privileged and shared. So is root. */
1096         if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) )
1097                 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) )
1098                 || op->o_do_not_cache || be_isroot( op ) )
1099         {
1100                 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
1101                 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
1102                 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op );
1103
1104         } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) )
1105         {
1106                 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1107                 BER_BVSTR( &mc_curr.mc_local_ndn, "" );
1108                 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1109
1110         } else {
1111                 mc_curr.mc_local_ndn = op->o_ndn;
1112
1113                 /* Explicit binds must not be shared */
1114                 if ( !BER_BVISEMPTY( &op->o_ndn )
1115                         || op->o_tag == LDAP_REQ_BIND
1116                         || SLAP_IS_AUTHZ_BACKEND( op ) )
1117                 {
1118                         mc_curr.mc_conn = op->o_conn;
1119
1120                 } else {
1121                         LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1122                         LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1123                 }
1124         }
1125
1126         /* Explicit Bind requests always get their own conn */
1127         if ( sendok & LDAP_BACK_BINDING ) {
1128                 mc_curr.mc_conn = op->o_conn;
1129
1130         } else {
1131                 /* Searches for a metaconn in the avl tree */
1132 retry_lock:;
1133                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1134                 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) {
1135                         /* lookup a conn that's not binding */
1136                         LDAP_TAILQ_FOREACH( mc,
1137                                 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv,
1138                                 mc_q )
1139                         {
1140                                 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) {
1141                                         break;
1142                                 }
1143                         }
1144
1145                         if ( mc != NULL ) {
1146                                 /* move to tail of queue */
1147                                 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1148                                         metaconn_t, mc_q ) )
1149                                 {
1150                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1151                                                 mc, mc_q );
1152                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1153                                         LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1154                                                 mc, mc_q );
1155                                 }
1156
1157                         } else if ( !LDAP_BACK_USE_TEMPORARIES( mi )
1158                                 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max )
1159                         {
1160                                 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv );
1161                         }
1162
1163
1164                 } else {
1165                         mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1166                                 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1167                 }
1168
1169                 if ( mc ) {
1170                         /* catch taint errors */
1171                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1172
1173                         /* Don't reuse connections while they're still binding
1174                          * NOTE: only makes sense for binds */
1175                         if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1176                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1177                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1178
1179                                         ldap_pvt_thread_yield();
1180                                         goto retry_lock;
1181                                 }
1182
1183                                 /* release conn, and create a temporary */
1184                                 mc = NULL;
1185
1186                         } else {
1187                                 if ( mc->mc_refcnt == 0 && (( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1188                                         || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout )) )
1189                                 {
1190 #if META_BACK_PRINT_CONNTREE > 0
1191                                         meta_back_print_conntree( mi,
1192                                                 ">>> meta_back_getconn(expired)" );
1193 #endif /* META_BACK_PRINT_CONNTREE */
1194
1195                                         /* don't let anyone else use this expired connection */
1196                                         if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1197                                                 if ( mc->mc_q.tqe_prev != NULL ) {
1198                                                         assert( LDAP_BACK_CONN_CACHED( mc ) );
1199                                                         assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1200                                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1201                                                                 mc, mc_q );
1202                                                         mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1203                                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1204
1205                                                 } else {
1206                                                         assert( !LDAP_BACK_CONN_CACHED( mc ) );
1207                                                 }
1208
1209                                         } else {
1210                                                 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1211                                                         (caddr_t)mc, meta_back_conndnmc_cmp );
1212                                         }
1213
1214 #if META_BACK_PRINT_CONNTREE > 0
1215                                         meta_back_print_conntree( mi,
1216                                                 "<<< meta_back_getconn(expired)" );
1217 #endif /* META_BACK_PRINT_CONNTREE */
1218                                         LDAP_BACK_CONN_TAINTED_SET( mc );
1219                                         LDAP_BACK_CONN_CACHED_CLEAR( mc );
1220
1221                                         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1222                                                 char buf[STRLENOF("4294967295U") + 1] = { 0 };
1223                                                 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1224
1225                                                 Debug( LDAP_DEBUG_TRACE,
1226                                                         "%s meta_back_getconn: mc=%p conn=%s expired (tainted).\n",
1227                                                         op->o_log_prefix, (void *)mc, buf );
1228                                         }
1229                                 }
1230
1231                                 mc->mc_refcnt++;
1232                         }
1233                 }
1234                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1235         }
1236
1237         switch ( op->o_tag ) {
1238         case LDAP_REQ_ADD:
1239                 /* if we go to selection, the entry must not exist,
1240                  * and we must be able to resolve the parent */
1241                 dn_type = META_DNTYPE_PARENT;
1242                 dnParent( &ndn, &pndn );
1243                 break;
1244
1245         case LDAP_REQ_MODRDN:
1246                 /* if nnewSuperior is not NULL, it must resolve
1247                  * to the same candidate as the req_ndn */
1248                 if ( op->orr_nnewSup ) {
1249                         dn_type = META_DNTYPE_NEWPARENT;
1250                 }
1251                 break;
1252
1253         case LDAP_REQ_BIND:
1254                 /* if bound as rootdn, the backend must bind to all targets
1255                  * with the administrative identity
1256                  * (unless pseoudoroot-bind-defer is TRUE) */
1257                 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
1258                         op_type = META_OP_REQUIRE_ALL;
1259                 }
1260                 break;
1261
1262         case LDAP_REQ_COMPARE:
1263         case LDAP_REQ_DELETE:
1264         case LDAP_REQ_MODIFY:
1265                 /* just a unique candidate */
1266                 break;
1267
1268         case LDAP_REQ_SEARCH:
1269                 /* allow multiple candidates for the searchBase */
1270                 op_type = META_OP_ALLOW_MULTIPLE;
1271                 break;
1272
1273         default:
1274                 /* right now, just break (exop?) */
1275                 break;
1276         }
1277
1278         /*
1279          * require all connections ...
1280          */
1281         if ( op_type == META_OP_REQUIRE_ALL ) {
1282
1283                 /* Looks like we didn't get a bind. Open a new session... */
1284                 if ( mc == NULL ) {
1285                         assert( new_conn == 0 );
1286                         mc = metaconn_alloc( op );
1287                         mc->mc_conn = mc_curr.mc_conn;
1288                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1289                         new_conn = 1;
1290                         if ( sendok & LDAP_BACK_BINDING ) {
1291                                 LDAP_BACK_CONN_BINDING_SET( mc );
1292                         }
1293                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1294                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1295
1296                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1297                                 LDAP_BACK_CONN_ISANON_SET( mc );
1298                         }
1299
1300                 } else if ( 0 ) {
1301                         /* TODO: if any of the connections is binding,
1302                          * release mc and create a new one */
1303                 }
1304
1305                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1306                         /*
1307                          * The target is activated; if needed, it is
1308                          * also init'd
1309                          */
1310                         candidates[ i ].sr_err = meta_back_init_one_conn( op,
1311                                 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1312                                 LDAP_BACK_DONTSEND, !new_conn );
1313                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1314                                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1315                                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1316                                 }
1317                                 META_CANDIDATE_SET( &candidates[ i ] );
1318                                 ncandidates++;
1319
1320                         } else {
1321
1322                                 /*
1323                                  * FIXME: in case one target cannot
1324                                  * be init'd, should the other ones
1325                                  * be tried?
1326                                  */
1327                                 META_CANDIDATE_RESET( &candidates[ i ] );
1328                                 err = candidates[ i ].sr_err;
1329                                 continue;
1330                         }
1331                 }
1332
1333                 if ( ncandidates == 0 ) {
1334                         if ( new_conn ) {
1335                                 mc->mc_refcnt = 0;
1336                                 meta_back_conn_free( mc );
1337
1338                         } else {
1339                                 meta_back_release_conn( mi, mc );
1340                         }
1341
1342                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
1343                         rs->sr_text = "Unable to select valid candidates";
1344
1345                         if ( sendok & LDAP_BACK_SENDERR ) {
1346                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1347                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1348                                 }
1349                                 send_ldap_result( op, rs );
1350                                 rs->sr_matched = NULL;
1351                         }
1352
1353                         return NULL;
1354                 }
1355
1356                 goto done;
1357         }
1358
1359         /*
1360          * looks in cache, if any
1361          */
1362         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1363                 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1364         }
1365
1366         if ( op_type == META_OP_REQUIRE_SINGLE ) {
1367                 metatarget_t            *mt = NULL;
1368                 metasingleconn_t        *msc = NULL;
1369
1370                 int                     j;
1371
1372                 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1373                         META_CANDIDATE_RESET( &candidates[ j ] );
1374                 }
1375
1376                 /*
1377                  * tries to get a unique candidate
1378                  * (takes care of default target)
1379                  */
1380                 if ( i == META_TARGET_NONE ) {
1381                         i = meta_back_get_candidate( op, rs, &ndn );
1382
1383                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1384                                 i = meta_back_get_candidate( op, rs, &pndn );
1385                         }
1386
1387                         if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1388                                 if ( mc != NULL ) {
1389                                         meta_back_release_conn( mi, mc );
1390                                 }
1391
1392                                 if ( sendok & LDAP_BACK_SENDERR ) {
1393                                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1394                                                 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1395                                         }
1396                                         send_ldap_result( op, rs );
1397                                         rs->sr_matched = NULL;
1398                                 }
1399
1400                                 return NULL;
1401                         }
1402                 }
1403
1404                 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1405                 {
1406                         if ( mc != NULL ) {
1407                                 meta_back_release_conn( mi, mc );
1408                         }
1409
1410                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1411                         rs->sr_text = "Cross-target rename not supported";
1412                         if ( sendok & LDAP_BACK_SENDERR ) {
1413                                 send_ldap_result( op, rs );
1414                         }
1415
1416                         return NULL;
1417                 }
1418
1419                 Debug( LDAP_DEBUG_TRACE,
1420         "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1421                                 i, op->o_req_ndn.bv_val, 0 );
1422
1423                 if ( mc == NULL ) {
1424                         /* Retries searching for a metaconn in the avl tree
1425                          * the reason is that the connection might have been
1426                          * created by meta_back_get_candidate() */
1427                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
1428 retry_lock2:;
1429                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1430                                 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1431                                         (caddr_t)&mc_curr, meta_back_conndn_cmp );
1432                                 if ( mc != NULL ) {
1433                                         /* catch taint errors */
1434                                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1435
1436                                         /* Don't reuse connections while they're still binding */
1437                                         if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] )
1438                                                 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) )
1439                                         {
1440                                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1441                                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1442                                                         ldap_pvt_thread_yield();
1443                                                         goto retry_lock2;
1444                                                 }
1445
1446                                                 mc = NULL;
1447
1448                                         } else {
1449                                                 mc->mc_refcnt++;
1450                                         }
1451                                 }
1452                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1453                         }
1454
1455                         /* Looks like we didn't get a bind. Open a new session... */
1456                         if ( mc == NULL ) {
1457                                 assert( new_conn == 0 );
1458                                 mc = metaconn_alloc( op );
1459                                 mc->mc_conn = mc_curr.mc_conn;
1460                                 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1461                                 new_conn = 1;
1462                                 if ( sendok & LDAP_BACK_BINDING ) {
1463                                         LDAP_BACK_CONN_BINDING_SET( mc );
1464                                 }
1465                                 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1466                                         LDAP_BACK_CONN_ISPRIV_SET( mc );
1467
1468                                 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1469                                         LDAP_BACK_CONN_ISANON_SET( mc );
1470                                 }
1471                         }
1472                 }
1473
1474                 /*
1475                  * Clear all other candidates
1476                  */
1477                 ( void )meta_clear_unused_candidates( op, i );
1478
1479                 mt = mi->mi_targets[ i ];
1480                 msc = &mc->mc_conns[ i ];
1481
1482                 /*
1483                  * The target is activated; if needed, it is
1484                  * also init'd. In case of error, meta_back_init_one_conn
1485                  * sends the appropriate result.
1486                  */
1487                 err = meta_back_init_one_conn( op, rs, mc, i,
1488                         LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn );
1489                 if ( err != LDAP_SUCCESS ) {
1490                         /*
1491                          * FIXME: in case one target cannot
1492                          * be init'd, should the other ones
1493                          * be tried?
1494                          */
1495                         META_CANDIDATE_RESET( &candidates[ i ] );
1496                         if ( new_conn ) {
1497                                 mc->mc_refcnt = 0;
1498                                 meta_back_conn_free( mc );
1499
1500                         } else {
1501                                 meta_back_release_conn( mi, mc );
1502                         }
1503                         return NULL;
1504                 }
1505
1506                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1507                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1508                 }
1509
1510                 candidates[ i ].sr_err = LDAP_SUCCESS;
1511                 META_CANDIDATE_SET( &candidates[ i ] );
1512                 ncandidates++;
1513
1514                 if ( candidate ) {
1515                         *candidate = i;
1516                 }
1517
1518         /*
1519          * if no unique candidate ...
1520          */
1521         } else {
1522
1523                 /* Looks like we didn't get a bind. Open a new session... */
1524                 if ( mc == NULL ) {
1525                         assert( new_conn == 0 );
1526                         mc = metaconn_alloc( op );
1527                         mc->mc_conn = mc_curr.mc_conn;
1528                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1529                         new_conn = 1;
1530                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1531                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1532
1533                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1534                                 LDAP_BACK_CONN_ISANON_SET( mc );
1535                         }
1536                 }
1537
1538                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1539                         metatarget_t            *mt = mi->mi_targets[ i ];
1540
1541                         META_CANDIDATE_RESET( &candidates[ i ] );
1542
1543                         if ( i == cached
1544                                 || meta_back_is_candidate( mt, &op->o_req_ndn,
1545                                         op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_SUBTREE ) )
1546                         {
1547
1548                                 /*
1549                                  * The target is activated; if needed, it is
1550                                  * also init'd
1551                                  */
1552                                 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1553                                         LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1554                                         LDAP_BACK_DONTSEND, !new_conn );
1555                                 candidates[ i ].sr_err = lerr;
1556                                 if ( lerr == LDAP_SUCCESS ) {
1557                                         META_CANDIDATE_SET( &candidates[ i ] );
1558                                         ncandidates++;
1559
1560                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1561                                                 op->o_log_prefix, i, 0 );
1562
1563                                 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1564                                         META_CANDIDATE_SET( &candidates[ i ] );
1565
1566                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1567                                                 op->o_log_prefix, i,
1568                                                 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1569
1570                                 } else {
1571
1572                                         /*
1573                                          * FIXME: in case one target cannot
1574                                          * be init'd, should the other ones
1575                                          * be tried?
1576                                          */
1577                                         if ( new_conn ) {
1578                                                 ( void )meta_clear_one_candidate( op, mc, i );
1579                                         }
1580                                         /* leave the target candidate, but record the error for later use */
1581                                         err = lerr;
1582
1583                                         if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1584                                                 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined err=%d\n",
1585                                                         op->o_log_prefix, i, lerr );
1586
1587                                         } else {
1588                                                 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed err=%d\n",
1589                                                         op->o_log_prefix, i, lerr );
1590                                         }
1591
1592                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1593                                                 if ( sendok & LDAP_BACK_SENDERR ) {
1594                                                         send_ldap_result( op, rs );
1595                                                 }
1596                                                 if ( new_conn ) {
1597                                                         mc->mc_refcnt = 0;
1598                                                         meta_back_conn_free( mc );
1599
1600                                                 } else {
1601                                                         meta_back_release_conn( mi, mc );
1602                                                 }
1603
1604                                                 return NULL;
1605                                         }
1606
1607                                         continue;
1608                                 }
1609
1610                         } else {
1611                                 if ( new_conn ) {
1612                                         ( void )meta_clear_one_candidate( op, mc, i );
1613                                 }
1614                         }
1615                 }
1616
1617                 if ( ncandidates == 0 ) {
1618                         if ( new_conn ) {
1619                                 mc->mc_refcnt = 0;
1620                                 meta_back_conn_free( mc );
1621
1622                         } else {
1623                                 meta_back_release_conn( mi, mc );
1624                         }
1625
1626                         if ( rs->sr_err == LDAP_SUCCESS ) {
1627                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1628                                 rs->sr_text = "Unable to select valid candidates";
1629                         }
1630
1631                         if ( sendok & LDAP_BACK_SENDERR ) {
1632                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1633                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1634                                 }
1635                                 send_ldap_result( op, rs );
1636                                 rs->sr_matched = NULL;
1637                         }
1638
1639                         return NULL;
1640                 }
1641         }
1642
1643 done:;
1644         /* clear out meta_back_init_one_conn non-fatal errors */
1645         rs->sr_err = LDAP_SUCCESS;
1646         rs->sr_text = NULL;
1647
1648         /* touch the timestamp */
1649         if ( mi->mi_idle_timeout != 0 ) {
1650                 mc->mc_time = op->o_time;
1651         }
1652
1653         if ( new_conn ) {
1654                 if ( mi->mi_conn_ttl ) {
1655                         mc->mc_create_time = op->o_time;
1656                 }
1657
1658                 /*
1659                  * Inserts the newly created metaconn in the avl tree
1660                  */
1661                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1662 #if META_BACK_PRINT_CONNTREE > 0
1663                 meta_back_print_conntree( mi, ">>> meta_back_getconn" );
1664 #endif /* META_BACK_PRINT_CONNTREE */
1665
1666                 err = 0;
1667                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1668                         if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) {
1669                                 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1670                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++;
1671                                 LDAP_BACK_CONN_CACHED_SET( mc );
1672
1673                         } else {
1674                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1675                         }
1676                         rs->sr_err = 0;
1677
1678                 } else if ( !( sendok & LDAP_BACK_BINDING ) ) {
1679                         err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1680                                 meta_back_conndn_cmp, meta_back_conndn_dup );
1681                         LDAP_BACK_CONN_CACHED_SET( mc );
1682                 }
1683
1684 #if META_BACK_PRINT_CONNTREE > 0
1685                 meta_back_print_conntree( mi, "<<< meta_back_getconn" );
1686 #endif /* META_BACK_PRINT_CONNTREE */
1687                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1688
1689                 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1690                         /*
1691                          * Err could be -1 in case a duplicate metaconn is inserted
1692                          */
1693                         switch ( err ) {
1694                         case 0:
1695                                 break;
1696
1697                         case -1:
1698                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1699                                 /* duplicate: free and try to get the newly created one */
1700                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1701                                         mc->mc_refcnt = 0;
1702                                         meta_back_conn_free( mc );
1703
1704                                         new_conn = 0;
1705                                         goto retry_lock;
1706                                 }
1707
1708                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1709                                 break;
1710
1711                         default:
1712                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1713                                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
1714                                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1715                                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1716
1717                                         Debug( LDAP_DEBUG_ANY,
1718                                                 "%s meta_back_getconn: candidates=%d conn=%s insert failed\n",
1719                                                 op->o_log_prefix, ncandidates, buf );
1720                                 }
1721
1722                                 mc->mc_refcnt = 0;
1723                                 meta_back_conn_free( mc );
1724
1725                                 rs->sr_err = LDAP_OTHER;
1726                                 rs->sr_text = "Proxy bind collision";
1727                                 if ( sendok & LDAP_BACK_SENDERR ) {
1728                                         send_ldap_result( op, rs );
1729                                 }
1730                                 return NULL;
1731                         }
1732                 }
1733
1734                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1735                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1736                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1737
1738                         Debug( LDAP_DEBUG_TRACE,
1739                                 "%s meta_back_getconn: candidates=%d conn=%s inserted\n",
1740                                 op->o_log_prefix, ncandidates, buf );
1741                 }
1742
1743         } else {
1744                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1745                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1746                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1747
1748                         Debug( LDAP_DEBUG_TRACE,
1749                                 "%s meta_back_getconn: candidates=%d conn=%s fetched\n",
1750                                 op->o_log_prefix, ncandidates, buf );
1751                 }
1752         }
1753
1754         return mc;
1755 }
1756
1757 void
1758 meta_back_release_conn_lock(
1759         metainfo_t              *mi,
1760         metaconn_t              *mc,
1761         int                     dolock )
1762 {
1763         assert( mc != NULL );
1764
1765         if ( dolock ) {
1766                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1767         }
1768         assert( mc->mc_refcnt > 0 );
1769         mc->mc_refcnt--;
1770         /* NOTE: the connection is removed if either it is tainted
1771          * or if it is shared and no one else is using it.  This needs
1772          * to occur because for intrinsic reasons cached connections
1773          * that are not privileged would live forever and pollute
1774          * the connection space (and eat up resources).  Maybe this
1775          * should be configurable... */
1776         if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) {
1777 #if META_BACK_PRINT_CONNTREE > 0
1778                 meta_back_print_conntree( mi, ">>> meta_back_release_conn" );
1779 #endif /* META_BACK_PRINT_CONNTREE */
1780
1781                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1782                         if ( mc->mc_q.tqe_prev != NULL ) {
1783                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
1784                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1785                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1786                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1787                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1788
1789                         } else {
1790                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1791                         }
1792
1793                 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) {
1794                         metaconn_t      *tmpmc;
1795
1796                         tmpmc = avl_delete( &mi->mi_conninfo.lai_tree,
1797                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
1798
1799                         /* Overparanoid, but useful... */
1800                         assert( tmpmc == NULL || tmpmc == mc );
1801                 }
1802
1803                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1804
1805 #if META_BACK_PRINT_CONNTREE > 0
1806                 meta_back_print_conntree( mi, "<<< meta_back_release_conn" );
1807 #endif /* META_BACK_PRINT_CONNTREE */
1808
1809                 if ( mc->mc_refcnt == 0 ) {
1810                         meta_back_conn_free( mc );
1811                         mc = NULL;
1812                 }
1813         }
1814
1815         if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) {
1816                 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1817         }
1818
1819         if ( dolock ) {
1820                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1821         }
1822 }
1823
1824 void
1825 meta_back_quarantine(
1826         Operation       *op,
1827         SlapReply       *rs,
1828         int             candidate )
1829 {
1830         metainfo_t              *mi = (metainfo_t *)op->o_bd->be_private;
1831         metatarget_t            *mt = mi->mi_targets[ candidate ];
1832
1833         slap_retry_info_t       *ri = &mt->mt_quarantine;
1834
1835         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1836
1837         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1838                 time_t  new_last = slap_get_time();
1839
1840                 switch ( mt->mt_isquarantined ) {
1841                 case LDAP_BACK_FQ_NO:
1842                         if ( ri->ri_last == new_last ) {
1843                                 goto done;
1844                         }
1845
1846                         Debug( LDAP_DEBUG_ANY,
1847                                 "%s meta_back_quarantine[%d]: enter.\n",
1848                                 op->o_log_prefix, candidate, 0 );
1849
1850                         ri->ri_idx = 0;
1851                         ri->ri_count = 0;
1852                         break;
1853
1854                 case LDAP_BACK_FQ_RETRYING:
1855                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
1856                                 char    buf[ SLAP_TEXT_BUFLEN ];
1857
1858                                 snprintf( buf, sizeof( buf ),
1859                                         "meta_back_quarantine[%d]: block #%d try #%d failed",
1860                                         candidate, ri->ri_idx, ri->ri_count );
1861                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1862                                         op->o_log_prefix, buf, 0 );
1863                         }
1864
1865                         ++ri->ri_count;
1866                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1867                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1868                         {
1869                                 ri->ri_count = 0;
1870                                 ++ri->ri_idx;
1871                         }
1872                         break;
1873
1874                 default:
1875                         break;
1876                 }
1877
1878                 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1879                 ri->ri_last = new_last;
1880
1881         } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1882                 Debug( LDAP_DEBUG_ANY,
1883                         "%s meta_back_quarantine[%d]: exit.\n",
1884                         op->o_log_prefix, candidate, 0 );
1885
1886                 if ( mi->mi_quarantine_f ) {
1887                         (void)mi->mi_quarantine_f( mi, candidate,
1888                                 mi->mi_quarantine_p );
1889                 }
1890
1891                 ri->ri_count = 0;
1892                 ri->ri_idx = 0;
1893                 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1894         }
1895
1896 done:;
1897         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
1898 }