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 1999-2012 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 #ifdef HAVE_TLS
 425         if ( !is_ldaps ) {
 426                 slap_bindconf *sb = NULL;
 427
 428                 if ( ispriv ) {
 429                         sb = &mt->mt_idassert.si_bc;
 430                 } else {
 431                         sb = &mt->mt_tls;
 432                 }
 433
 434                 if ( sb->sb_tls_do_init ) {
 435                         bindconf_tls_set( sb, msc->msc_ld );
 436                 } else if ( sb->sb_tls_ctx ) {
 437                         ldap_set_option( msc->msc_ld, LDAP_OPT_X_TLS_CTX, sb->sb_tls_ctx );
 438                 }
 439
 440                 if ( sb == &mt->mt_idassert.si_bc && sb->sb_tls_ctx ) {
 441                         do_start_tls = 1;
 442
 443                 } else if ( META_BACK_TGT_USE_TLS( mt )
 444                         || ( op->o_conn->c_is_tls && META_BACK_TGT_PROPAGATE_TLS( mt ) ) )
 445                 {
 446                         do_start_tls = 1;
 447                 }
 448         }
 449
 450         /* start TLS ("tls [try-]{start|propagate}" statement) */
 451         if ( do_start_tls ) {
 452 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 453                 /*
 454                  * use asynchronous StartTLS; in case, chase referral
 455                  * FIXME: OpenLDAP does not return referral on StartTLS yet
 456                  */
 457                 int             msgid;
 458
 459                 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
 460                 if ( rs->sr_err == LDAP_SUCCESS ) {
 461                         LDAPMessage     *res = NULL;
 462                         int             rc, nretries = mt->mt_nretries;
 463                         struct timeval  tv;
 464
 465                         LDAP_BACK_TV_SET( &tv );
 466
 467 retry:;
 468                         rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 469                         switch ( rc ) {
 470                         case -1:
 471                                 rs->sr_err = LDAP_OTHER;
 472                                 break;
 473
 474                         case 0:
 475                                 if ( nretries != 0 ) {
 476                                         if ( nretries > 0 ) {
 477                                                 nretries--;
 478                                         }
 479                                         LDAP_BACK_TV_SET( &tv );
 480                                         goto retry;
 481                                 }
 482                                 rs->sr_err = LDAP_OTHER;
 483                                 break;
 484
 485                         default:
 486                                 /* only touch when activity actually took place... */
 487                                 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
 488                                         msc->msc_time = op->o_time;
 489                                 }
 490                                 break;
 491                         }
 492
 493                         if ( rc == LDAP_RES_EXTENDED ) {
 494                                 struct berval   *data = NULL;
 495
 496                                 /* NOTE: right now, data is unused, so don't get it */
 497                                 rs->sr_err = ldap_parse_extended_result( msc->msc_ld,
 498                                         res, NULL, NULL /* &data */ , 0 );
 499                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 500                                         int             err;
 501
 502                                         /* FIXME: matched? referrals? response controls? */
 503                                         rs->sr_err = ldap_parse_result( msc->msc_ld,
 504                                                 res, &err, NULL, NULL, NULL, NULL, 1 );
 505                                         res = NULL;
 506
 507                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 508                                                 rs->sr_err = err;
 509                                         }
 510                                         rs->sr_err = slap_map_api2result( rs );
 511
 512                                         /* FIXME: in case a referral
 513                                          * is returned, should we try
 514                                          * using it instead of the
 515                                          * configured URI? */
 516                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 517                                                 ldap_install_tls( msc->msc_ld );
 518
 519                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 520                                                 /* FIXME: LDAP_OPERATIONS_ERROR? */
 521                                                 rs->sr_err = LDAP_OTHER;
 522                                                 rs->sr_text = "Unwilling to chase referral "
 523                                                         "returned by Start TLS exop";
 524                                         }
 525
 526                                         if ( data ) {
 527                                                 ber_bvfree( data );
 528                                         }
 529                                 }
 530
 531                         } else {
 532                                 rs->sr_err = LDAP_OTHER;
 533                         }
 534
 535                         if ( res != NULL ) {
 536                                 ldap_msgfree( res );
 537                         }
 538                 }
 539 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 540                 /*
 541                  * use synchronous StartTLS
 542                  */
 543                 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
 544 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 545
 546                 /* if StartTLS is requested, only attempt it if the URL
 547                  * is not "ldaps://"; this may occur not only in case
 548                  * of misconfiguration, but also when used in the chain
 549                  * overlay, where the "uri" can be parsed out of a referral */
 550                 if ( rs->sr_err == LDAP_SERVER_DOWN
 551                         || ( rs->sr_err != LDAP_SUCCESS
 552                                 && META_BACK_TGT_TLS_CRITICAL( mt ) ) )
 553                 {
 554
 555 #ifdef DEBUG_205
 556                         Debug( LDAP_DEBUG_ANY,
 557                                 "### %s meta_back_init_one_conn(TLS) "
 558                                 "ldap_unbind_ext[%d] ld=%p\n",
 559                                 op->o_log_prefix, candidate,
 560                                 (void *)msc->msc_ld );
 561 #endif /* DEBUG_205 */
 562
 563                         /* need to trash a failed Start TLS */
 564                         meta_clear_one_candidate( op, mc, candidate );
 565                         goto error_return;
 566                 }
 567         }
 568 #endif /* HAVE_TLS */
 569
 570         /*
 571          * Set the network timeout if set
 572          */
 573         if ( mt->mt_network_timeout != 0 ) {
 574                 struct timeval  network_timeout;
 575
 576                 network_timeout.tv_usec = 0;
 577                 network_timeout.tv_sec = mt->mt_network_timeout;
 578
 579                 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
 580                                 (void *)&network_timeout );
 581         }
 582
 583         /*
 584          * If the connection DN is not null, an attempt to rewrite it is made
 585          */
 586
 587         if ( ispriv ) {
 588                 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
 589                         ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
 590                         if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
 591                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 592                                         memset( msc->msc_cred.bv_val, 0,
 593                                                 msc->msc_cred.bv_len );
 594                                 }
 595                                 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
 596                         }
 597                         LDAP_BACK_CONN_ISIDASSERT_SET( msc );
 598
 599                 } else {
 600                         ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
 601                 }
 602
 603         } else {
 604                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 605                         memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 606                         ber_memfree_x( msc->msc_cred.bv_val, NULL );
 607                         BER_BVZERO( &msc->msc_cred );
 608                 }
 609                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 610                         ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
 611                         BER_BVZERO( &msc->msc_bound_ndn );
 612                 }
 613                 if ( !BER_BVISEMPTY( &op->o_ndn )
 614                         && SLAP_IS_AUTHZ_BACKEND( op )
 615                         && isauthz )
 616                 {
 617                         dc.target = mt;
 618                         dc.conn = op->o_conn;
 619                         dc.rs = rs;
 620                         dc.ctx = "bindDN";
 621
 622                         /*
 623                          * Rewrite the bind dn if needed
 624                          */
 625                         if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
 626                                                 &msc->msc_bound_ndn ) )
 627                         {
 628
 629 #ifdef DEBUG_205
 630                                 Debug( LDAP_DEBUG_ANY,
 631                                         "### %s meta_back_init_one_conn(rewrite) "
 632                                         "ldap_unbind_ext[%d] ld=%p\n",
 633                                         op->o_log_prefix, candidate,
 634                                         (void *)msc->msc_ld );
 635 #endif /* DEBUG_205 */
 636
 637                                 /* need to trash a connection not fully established */
 638                                 meta_clear_one_candidate( op, mc, candidate );
 639                                 goto error_return;
 640                         }
 641
 642                         /* copy the DN if needed */
 643                         if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
 644                                 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
 645                         }
 646
 647                         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 648
 649                 } else {
 650                         ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
 651                 }
 652         }
 653
 654         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 655
 656 error_return:;
 657         if ( dolock ) {
 658                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 659         }
 660         META_BACK_CONN_CREATING_CLEAR( msc );
 661         if ( rs->sr_err == LDAP_SUCCESS ) {
 662                 /*
 663                  * Sets a cookie for the rewrite session
 664                  */
 665                 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
 666                 META_BACK_CONN_INITED_SET( msc );
 667         }
 668         if ( dolock ) {
 669                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 670         }
 671
 672         if ( rs->sr_err != LDAP_SUCCESS ) {
 673                 rs->sr_err = slap_map_api2result( rs );
 674                 if ( sendok & LDAP_BACK_SENDERR ) {
 675                         send_ldap_result( op, rs );
 676                 }
 677         }
 678
 679         return rs->sr_err;
 680 }
 681
 682 /*
 683  * meta_back_retry
 684  *
 685  * Retries one connection
 686  */
 687 int
 688 meta_back_retry(
 689         Operation               *op,
 690         SlapReply               *rs,
 691         metaconn_t              **mcp,
 692         int                     candidate,
 693         ldap_back_send_t        sendok )
 694 {
 695         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 696         metatarget_t            *mt = mi->mi_targets[ candidate ];
 697         metaconn_t              *mc = *mcp;
 698         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 699         int                     rc = LDAP_UNAVAILABLE,
 700                                 binding,
 701                                 quarantine = 1;
 702
 703         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 704
 705         assert( !META_BACK_CONN_CREATING( msc ) );
 706         binding = LDAP_BACK_CONN_BINDING( msc );
 707         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 708
 709         assert( mc->mc_refcnt > 0 );
 710         if ( mc->mc_refcnt == 1 ) {
 711                 struct berval save_cred;
 712
 713                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
 714                         char    buf[ SLAP_TEXT_BUFLEN ];
 715
 716                         /* this lock is required; however,
 717                          * it's invoked only when logging is on */
 718                         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 719                         snprintf( buf, sizeof( buf ),
 720                                 "retrying URI=\"%s\" DN=\"%s\"",
 721                                 mt->mt_uri,
 722                                 BER_BVISNULL( &msc->msc_bound_ndn ) ?
 723                                         "" : msc->msc_bound_ndn.bv_val );
 724                         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 725
 726                         Debug( LDAP_DEBUG_ANY,
 727                                 "%s meta_back_retry[%d]: %s.\n",
 728                                 op->o_log_prefix, candidate, buf );
 729                 }
 730
 731                 /* save credentials, if any, for later use;
 732                  * meta_clear_one_candidate() would free them */
 733                 save_cred = msc->msc_cred;
 734                 BER_BVZERO( &msc->msc_cred );
 735
 736                 meta_clear_one_candidate( op, mc, candidate );
 737                 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 738
 739                 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 740
 741                 /* mc here must be the regular mc, reset and ready for init */
 742                 rc = meta_back_init_one_conn( op, rs, mc, candidate,
 743                         LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 );
 744
 745                 /* restore credentials, if any and if needed;
 746                  * meta_back_init_one_conn() restores msc_bound_ndn, if any;
 747                  * if no msc_bound_ndn is restored, destroy credentials */
 748                 if ( !BER_BVISNULL( &msc->msc_bound_ndn )
 749                         && BER_BVISNULL( &msc->msc_cred ) )
 750                 {
 751                         msc->msc_cred = save_cred;
 752
 753                 } else if ( !BER_BVISNULL( &save_cred ) ) {
 754                         memset( save_cred.bv_val, 0, save_cred.bv_len );
 755                         ber_memfree_x( save_cred.bv_val, NULL );
 756                 }
 757
 758                 /* restore the "binding" flag, in case */
 759                 if ( binding ) {
 760                         LDAP_BACK_CONN_BINDING_SET( msc );
 761                 }
 762
 763                 if ( rc == LDAP_SUCCESS ) {
 764                         quarantine = 0;
 765                         rc = meta_back_single_dobind( op, rs, mcp, candidate,
 766                                 sendok, mt->mt_nretries, 0 );
 767
 768                         Debug( LDAP_DEBUG_ANY,
 769                                 "%s meta_back_retry[%d]: "
 770                                 "meta_back_single_dobind=%d\n",
 771                                 op->o_log_prefix, candidate, rc );
 772                         if ( rc == LDAP_SUCCESS ) {
 773                                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
 774                                         !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 775                                 {
 776                                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 777
 778                                 } else {
 779                                         LDAP_BACK_CONN_ISANON_SET( msc );
 780                                 }
 781
 782                                 /* when bound, dispose of the "binding" flag */
 783                                 if ( binding ) {
 784                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 785                                 }
 786                         }
 787                 }
 788
 789                 /* don't send twice */
 790                 sendok &= ~LDAP_BACK_SENDERR;
 791         }
 792
 793         if ( rc != LDAP_SUCCESS ) {
 794                 SlapReply               *candidates = meta_back_candidates_get( op );
 795
 796                 candidates[ candidate ].sr_err = rc;
 797
 798                 if ( *mcp != NULL ) {
 799                         if ( mc->mc_refcnt == 1 ) {
 800                                 if ( binding ) {
 801                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 802                                 }
 803                                 (void)meta_clear_one_candidate( op, mc, candidate );
 804                         }
 805
 806                         LDAP_BACK_CONN_TAINTED_SET( mc );
 807                         /* only release if mandatory; otherwise
 808                          * let the caller do what's best before
 809                          * releasing */
 810                         if ( META_BACK_ONERR_STOP( mi ) ) {
 811                                 meta_back_release_conn_lock( mi, mc, 0 );
 812                                 *mcp = NULL;
 813
 814                         } else {
 815 #if META_BACK_PRINT_CONNTREE > 0
 816                                 meta_back_print_conntree( mi, ">>> meta_back_retry" );
 817 #endif /* META_BACK_PRINT_CONNTREE */
 818
 819                                 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */
 820                                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
 821                                         if ( mc->mc_q.tqe_prev != NULL ) {
 822                                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
 823                                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
 824                                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
 825                                                         mc, mc_q );
 826                                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
 827                                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
 828
 829                                         } else {
 830                                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
 831                                         }
 832
 833                                 } else {
 834                                         /* FIXME: check if in tree, for consistency? */
 835                                         (void)avl_delete( &mi->mi_conninfo.lai_tree,
 836                                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
 837                                 }
 838                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
 839
 840 #if META_BACK_PRINT_CONNTREE > 0
 841                                 meta_back_print_conntree( mi, "<<< meta_back_retry" );
 842 #endif /* META_BACK_PRINT_CONNTREE */
 843                         }
 844                 }
 845
 846                 if ( sendok & LDAP_BACK_SENDERR ) {
 847                         rs->sr_err = rc;
 848                         rs->sr_text = "Unable to retry";
 849                         send_ldap_result( op, rs );
 850                 }
 851         }
 852
 853         if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) {
 854                 meta_back_quarantine( op, rs, candidate );
 855         }
 856
 857         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 858
 859         return rc == LDAP_SUCCESS ? 1 : 0;
 860 }
 861
 862 /*
 863  * callback for unique candidate selection
 864  */
 865 static int
 866 meta_back_conn_cb( Operation *op, SlapReply *rs )
 867 {
 868         assert( op->o_tag == LDAP_REQ_SEARCH );
 869
 870         switch ( rs->sr_type ) {
 871         case REP_SEARCH:
 872                 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
 873                 break;
 874
 875         case REP_SEARCHREF:
 876         case REP_RESULT:
 877                 break;
 878
 879         default:
 880                 return rs->sr_err;
 881         }
 882
 883         return 0;
 884 }
 885
 886
 887 static int
 888 meta_back_get_candidate(
 889         Operation       *op,
 890         SlapReply       *rs,
 891         struct berval   *ndn )
 892 {
 893         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 894         long            candidate;
 895
 896         /*
 897          * tries to get a unique candidate
 898          * (takes care of default target)
 899          */
 900         candidate = meta_back_select_unique_candidate( mi, ndn );
 901
 902         /*
 903          * if any is found, inits the connection
 904          */
 905         if ( candidate == META_TARGET_NONE ) {
 906                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 907                 rs->sr_text = "No suitable candidate target found";
 908
 909         } else if ( candidate == META_TARGET_MULTIPLE ) {
 910                 Operation       op2 = *op;
 911                 SlapReply       rs2 = { REP_RESULT };
 912                 slap_callback   cb2 = { 0 };
 913                 int             rc;
 914
 915                 /* try to get a unique match for the request ndn
 916                  * among the multiple candidates available */
 917                 op2.o_tag = LDAP_REQ_SEARCH;
 918                 op2.o_req_dn = *ndn;
 919                 op2.o_req_ndn = *ndn;
 920                 op2.ors_scope = LDAP_SCOPE_BASE;
 921                 op2.ors_deref = LDAP_DEREF_NEVER;
 922                 op2.ors_attrs = slap_anlist_no_attrs;
 923                 op2.ors_attrsonly = 0;
 924                 op2.ors_limit = NULL;
 925                 op2.ors_slimit = 1;
 926                 op2.ors_tlimit = SLAP_NO_LIMIT;
 927
 928                 op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
 929                 op2.ors_filterstr = *slap_filterstr_objectClass_pres;
 930
 931                 op2.o_callback = &cb2;
 932                 cb2.sc_response = meta_back_conn_cb;
 933                 cb2.sc_private = (void *)&candidate;
 934
 935                 rc = op->o_bd->be_search( &op2, &rs2 );
 936
 937                 switch ( rs2.sr_err ) {
 938                 case LDAP_SUCCESS:
 939                 default:
 940                         rs->sr_err = rs2.sr_err;
 941                         break;
 942
 943                 case LDAP_SIZELIMIT_EXCEEDED:
 944                         /* if multiple candidates can serve the operation,
 945                          * and a default target is defined, and it is
 946                          * a candidate, try using it (FIXME: YMMV) */
 947                         if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
 948                                 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
 949                                                 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
 950                         {
 951                                 candidate = mi->mi_defaulttarget;
 952                                 rs->sr_err = LDAP_SUCCESS;
 953                                 rs->sr_text = NULL;
 954
 955                         } else {
 956                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 957                                 rs->sr_text = "Unable to select unique candidate target";
 958                         }
 959                         break;
 960                 }
 961
 962         } else {
 963                 rs->sr_err = LDAP_SUCCESS;
 964         }
 965
 966         return candidate;
 967 }
 968
 969 static void     *meta_back_candidates_dummy;
 970
 971 static void
 972 meta_back_candidates_keyfree(
 973         void            *key,
 974         void            *data )
 975 {
 976         metacandidates_t        *mc = (metacandidates_t *)data;
 977
 978         ber_memfree_x( mc->mc_candidates, NULL );
 979         ber_memfree_x( data, NULL );
 980 }
 981
 982 SlapReply *
 983 meta_back_candidates_get( Operation *op )
 984 {
 985         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 986         metacandidates_t        *mc;
 987
 988         if ( op->o_threadctx ) {
 989                 void            *data = NULL;
 990
 991                 ldap_pvt_thread_pool_getkey( op->o_threadctx,
 992                                 &meta_back_candidates_dummy, &data, NULL );
 993                 mc = (metacandidates_t *)data;
 994
 995         } else {
 996                 mc = mi->mi_candidates;
 997         }
 998
 999         if ( mc == NULL ) {
1000                 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
1001                 mc->mc_ntargets = mi->mi_ntargets;
1002                 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
1003                 if ( op->o_threadctx ) {
1004                         void            *data = NULL;
1005
1006                         data = (void *)mc;
1007                         ldap_pvt_thread_pool_setkey( op->o_threadctx,
1008                                         &meta_back_candidates_dummy, data,
1009                                         meta_back_candidates_keyfree,
1010                                         NULL, NULL );
1011
1012                 } else {
1013                         mi->mi_candidates = mc;
1014                 }
1015
1016         } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
1017                 /* NOTE: in the future, may want to allow back-config
1018                  * to add/remove targets from back-meta... */
1019                 mc->mc_candidates = ch_realloc( mc->mc_candidates,
1020                                 sizeof( SlapReply ) * mi->mi_ntargets );
1021                 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
1022                         sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
1023                 mc->mc_ntargets = mi->mi_ntargets;
1024         }
1025
1026         return mc->mc_candidates;
1027 }
1028
1029 /*
1030  * meta_back_getconn
1031  *
1032  * Prepares the connection structure
1033  *
1034  * RATIONALE:
1035  *
1036  * - determine what DN is being requested:
1037  *
1038  *      op      requires candidate      checks
1039  *
1040  *      add     unique                  parent of o_req_ndn
1041  *      bind    unique^*[/all]          o_req_ndn [no check]
1042  *      compare unique^+                o_req_ndn
1043  *      delete  unique                  o_req_ndn
1044  *      modify  unique                  o_req_ndn
1045  *      search  any                     o_req_ndn
1046  *      modrdn  unique[, unique]        o_req_ndn[, orr_nnewSup]
1047  *
1048  * - for ops that require the candidate to be unique, in case of multiple
1049  *   occurrences an internal search with sizeLimit=1 is performed
1050  *   if a unique candidate can actually be determined.  If none is found,
1051  *   the operation aborts; if multiple are found, the default target
1052  *   is used if defined and candidate; otherwise the operation aborts.
1053  *
1054  * *^note: actually, the bind operation is handled much like a search;
1055  *   i.e. the bind is broadcast to all candidate targets.
1056  *
1057  * +^note: actually, the compare operation is handled much like a search;
1058  *   i.e. the compare is broadcast to all candidate targets, while checking
1059  *   that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
1060  *   returned.
1061  */
1062 metaconn_t *
1063 meta_back_getconn(
1064         Operation               *op,
1065         SlapReply               *rs,
1066         int                     *candidate,
1067         ldap_back_send_t        sendok )
1068 {
1069         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
1070         metaconn_t      *mc = NULL,
1071                         mc_curr = {{ 0 }};
1072         int             cached = META_TARGET_NONE,
1073                         i = META_TARGET_NONE,
1074                         err = LDAP_SUCCESS,
1075                         new_conn = 0,
1076                         ncandidates = 0;
1077
1078
1079         meta_op_type    op_type = META_OP_REQUIRE_SINGLE;
1080         enum            {
1081                 META_DNTYPE_ENTRY,
1082                 META_DNTYPE_PARENT,
1083                 META_DNTYPE_NEWPARENT
1084         }               dn_type = META_DNTYPE_ENTRY;
1085         struct berval   ndn = op->o_req_ndn,
1086                         pndn;
1087
1088         SlapReply       *candidates = meta_back_candidates_get( op );
1089
1090         /* Internal searches are privileged and shared. So is root. */
1091         if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) )
1092                 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) )
1093                 || op->o_do_not_cache || be_isroot( op ) )
1094         {
1095                 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
1096                 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
1097                 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op );
1098
1099         } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) )
1100         {
1101                 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1102                 BER_BVSTR( &mc_curr.mc_local_ndn, "" );
1103                 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1104
1105         } else {
1106                 mc_curr.mc_local_ndn = op->o_ndn;
1107
1108                 /* Explicit binds must not be shared */
1109                 if ( !BER_BVISEMPTY( &op->o_ndn )
1110                         || op->o_tag == LDAP_REQ_BIND
1111                         || SLAP_IS_AUTHZ_BACKEND( op ) )
1112                 {
1113                         mc_curr.mc_conn = op->o_conn;
1114
1115                 } else {
1116                         LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1117                         LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1118                 }
1119         }
1120
1121         /* Explicit Bind requests always get their own conn */
1122         if ( sendok & LDAP_BACK_BINDING ) {
1123                 mc_curr.mc_conn = op->o_conn;
1124
1125         } else {
1126                 /* Searches for a metaconn in the avl tree */
1127 retry_lock:;
1128                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1129                 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) {
1130                         /* lookup a conn that's not binding */
1131                         LDAP_TAILQ_FOREACH( mc,
1132                                 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv,
1133                                 mc_q )
1134                         {
1135                                 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) {
1136                                         break;
1137                                 }
1138                         }
1139
1140                         if ( mc != NULL ) {
1141                                 /* move to tail of queue */
1142                                 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1143                                         metaconn_t, mc_q ) )
1144                                 {
1145                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1146                                                 mc, mc_q );
1147                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1148                                         LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1149                                                 mc, mc_q );
1150                                 }
1151
1152                         } else if ( !LDAP_BACK_USE_TEMPORARIES( mi )
1153                                 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max )
1154                         {
1155                                 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv );
1156                         }
1157
1158
1159                 } else {
1160                         mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1161                                 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1162                 }
1163
1164                 if ( mc ) {
1165                         /* catch taint errors */
1166                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1167
1168                         /* Don't reuse connections while they're still binding
1169                          * NOTE: only makes sense for binds */
1170                         if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1171                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1172                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1173
1174                                         ldap_pvt_thread_yield();
1175                                         goto retry_lock;
1176                                 }
1177
1178                                 /* release conn, and create a temporary */
1179                                 mc = NULL;
1180
1181                         } else {
1182                                 if ( ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1183                                         || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
1184                                 {
1185 #if META_BACK_PRINT_CONNTREE > 0
1186                                         meta_back_print_conntree( mi,
1187                                                 ">>> meta_back_getconn(expired)" );
1188 #endif /* META_BACK_PRINT_CONNTREE */
1189
1190                                         /* don't let anyone else use this expired connection */
1191                                         if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1192                                                 if ( mc->mc_q.tqe_prev != NULL ) {
1193                                                         assert( LDAP_BACK_CONN_CACHED( mc ) );
1194                                                         assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1195                                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1196                                                                 mc, mc_q );
1197                                                         mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1198                                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1199
1200                                                 } else {
1201                                                         assert( !LDAP_BACK_CONN_CACHED( mc ) );
1202                                                 }
1203
1204                                         } else {
1205                                                 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1206                                                         (caddr_t)mc, meta_back_conndnmc_cmp );
1207                                         }
1208
1209 #if META_BACK_PRINT_CONNTREE > 0
1210                                         meta_back_print_conntree( mi,
1211                                                 "<<< meta_back_getconn(expired)" );
1212 #endif /* META_BACK_PRINT_CONNTREE */
1213                                         LDAP_BACK_CONN_TAINTED_SET( mc );
1214                                         LDAP_BACK_CONN_CACHED_CLEAR( mc );
1215
1216                                         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1217                                                 char buf[STRLENOF("4294967295U") + 1] = { 0 };
1218                                                 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1219
1220                                                 Debug( LDAP_DEBUG_TRACE,
1221                                                         "%s meta_back_getconn: mc=%p conn=%s expired (tainted).\n",
1222                                                         op->o_log_prefix, (void *)mc, buf );
1223                                         }
1224                                 }
1225
1226                                 mc->mc_refcnt++;
1227                         }
1228                 }
1229                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1230         }
1231
1232         switch ( op->o_tag ) {
1233         case LDAP_REQ_ADD:
1234                 /* if we go to selection, the entry must not exist,
1235                  * and we must be able to resolve the parent */
1236                 dn_type = META_DNTYPE_PARENT;
1237                 dnParent( &ndn, &pndn );
1238                 break;
1239
1240         case LDAP_REQ_MODRDN:
1241                 /* if nnewSuperior is not NULL, it must resolve
1242                  * to the same candidate as the req_ndn */
1243                 if ( op->orr_nnewSup ) {
1244                         dn_type = META_DNTYPE_NEWPARENT;
1245                 }
1246                 break;
1247
1248         case LDAP_REQ_BIND:
1249                 /* if bound as rootdn, the backend must bind to all targets
1250                  * with the administrative identity
1251                  * (unless pseoudoroot-bind-defer is TRUE) */
1252                 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
1253                         op_type = META_OP_REQUIRE_ALL;
1254                 }
1255                 break;
1256
1257         case LDAP_REQ_COMPARE:
1258         case LDAP_REQ_DELETE:
1259         case LDAP_REQ_MODIFY:
1260                 /* just a unique candidate */
1261                 break;
1262
1263         case LDAP_REQ_SEARCH:
1264                 /* allow multiple candidates for the searchBase */
1265                 op_type = META_OP_ALLOW_MULTIPLE;
1266                 break;
1267
1268         default:
1269                 /* right now, just break (exop?) */
1270                 break;
1271         }
1272
1273         /*
1274          * require all connections ...
1275          */
1276         if ( op_type == META_OP_REQUIRE_ALL ) {
1277
1278                 /* Looks like we didn't get a bind. Open a new session... */
1279                 if ( mc == NULL ) {
1280                         assert( new_conn == 0 );
1281                         mc = metaconn_alloc( op );
1282                         mc->mc_conn = mc_curr.mc_conn;
1283                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1284                         new_conn = 1;
1285                         if ( sendok & LDAP_BACK_BINDING ) {
1286                                 LDAP_BACK_CONN_BINDING_SET( mc );
1287                         }
1288                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1289                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1290
1291                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1292                                 LDAP_BACK_CONN_ISANON_SET( mc );
1293                         }
1294
1295                 } else if ( 0 ) {
1296                         /* TODO: if any of the connections is binding,
1297                          * release mc and create a new one */
1298                 }
1299
1300                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1301                         /*
1302                          * The target is activated; if needed, it is
1303                          * also init'd
1304                          */
1305                         candidates[ i ].sr_err = meta_back_init_one_conn( op,
1306                                 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1307                                 LDAP_BACK_DONTSEND, !new_conn );
1308                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1309                                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1310                                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1311                                 }
1312                                 META_CANDIDATE_SET( &candidates[ i ] );
1313                                 ncandidates++;
1314
1315                         } else {
1316
1317                                 /*
1318                                  * FIXME: in case one target cannot
1319                                  * be init'd, should the other ones
1320                                  * be tried?
1321                                  */
1322                                 META_CANDIDATE_RESET( &candidates[ i ] );
1323                                 err = candidates[ i ].sr_err;
1324                                 continue;
1325                         }
1326                 }
1327
1328                 if ( ncandidates == 0 ) {
1329                         if ( new_conn ) {
1330                                 mc->mc_refcnt = 0;
1331                                 meta_back_conn_free( mc );
1332
1333                         } else {
1334                                 meta_back_release_conn( mi, mc );
1335                         }
1336
1337                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
1338                         rs->sr_text = "Unable to select valid candidates";
1339
1340                         if ( sendok & LDAP_BACK_SENDERR ) {
1341                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1342                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1343                                 }
1344                                 send_ldap_result( op, rs );
1345                                 rs->sr_matched = NULL;
1346                         }
1347
1348                         return NULL;
1349                 }
1350
1351                 goto done;
1352         }
1353
1354         /*
1355          * looks in cache, if any
1356          */
1357         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1358                 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1359         }
1360
1361         if ( op_type == META_OP_REQUIRE_SINGLE ) {
1362                 metatarget_t            *mt = NULL;
1363                 metasingleconn_t        *msc = NULL;
1364
1365                 int                     j;
1366
1367                 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1368                         META_CANDIDATE_RESET( &candidates[ j ] );
1369                 }
1370
1371                 /*
1372                  * tries to get a unique candidate
1373                  * (takes care of default target)
1374                  */
1375                 if ( i == META_TARGET_NONE ) {
1376                         i = meta_back_get_candidate( op, rs, &ndn );
1377
1378                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1379                                 i = meta_back_get_candidate( op, rs, &pndn );
1380                         }
1381
1382                         if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1383                                 if ( mc != NULL ) {
1384                                         meta_back_release_conn( mi, mc );
1385                                 }
1386
1387                                 if ( sendok & LDAP_BACK_SENDERR ) {
1388                                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1389                                                 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1390                                         }
1391                                         send_ldap_result( op, rs );
1392                                         rs->sr_matched = NULL;
1393                                 }
1394
1395                                 return NULL;
1396                         }
1397                 }
1398
1399                 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1400                 {
1401                         if ( mc != NULL ) {
1402                                 meta_back_release_conn( mi, mc );
1403                         }
1404
1405                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1406                         rs->sr_text = "Cross-target rename not supported";
1407                         if ( sendok & LDAP_BACK_SENDERR ) {
1408                                 send_ldap_result( op, rs );
1409                         }
1410
1411                         return NULL;
1412                 }
1413
1414                 Debug( LDAP_DEBUG_TRACE,
1415         "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1416                                 i, op->o_req_ndn.bv_val, 0 );
1417
1418                 if ( mc == NULL ) {
1419                         /* Retries searching for a metaconn in the avl tree
1420                          * the reason is that the connection might have been
1421                          * created by meta_back_get_candidate() */
1422                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
1423 retry_lock2:;
1424                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1425                                 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1426                                         (caddr_t)&mc_curr, meta_back_conndn_cmp );
1427                                 if ( mc != NULL ) {
1428                                         /* catch taint errors */
1429                                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1430
1431                                         /* Don't reuse connections while they're still binding */
1432                                         if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] )
1433                                                 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) )
1434                                         {
1435                                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1436                                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1437                                                         ldap_pvt_thread_yield();
1438                                                         goto retry_lock2;
1439                                                 }
1440
1441                                                 mc = NULL;
1442
1443                                         } else {
1444                                                 mc->mc_refcnt++;
1445                                         }
1446                                 }
1447                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1448                         }
1449
1450                         /* Looks like we didn't get a bind. Open a new session... */
1451                         if ( mc == NULL ) {
1452                                 assert( new_conn == 0 );
1453                                 mc = metaconn_alloc( op );
1454                                 mc->mc_conn = mc_curr.mc_conn;
1455                                 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1456                                 new_conn = 1;
1457                                 if ( sendok & LDAP_BACK_BINDING ) {
1458                                         LDAP_BACK_CONN_BINDING_SET( mc );
1459                                 }
1460                                 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1461                                         LDAP_BACK_CONN_ISPRIV_SET( mc );
1462
1463                                 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1464                                         LDAP_BACK_CONN_ISANON_SET( mc );
1465                                 }
1466                         }
1467                 }
1468
1469                 /*
1470                  * Clear all other candidates
1471                  */
1472                 ( void )meta_clear_unused_candidates( op, i );
1473
1474                 mt = mi->mi_targets[ i ];
1475                 msc = &mc->mc_conns[ i ];
1476
1477                 /*
1478                  * The target is activated; if needed, it is
1479                  * also init'd. In case of error, meta_back_init_one_conn
1480                  * sends the appropriate result.
1481                  */
1482                 err = meta_back_init_one_conn( op, rs, mc, i,
1483                         LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn );
1484                 if ( err != LDAP_SUCCESS ) {
1485                         /*
1486                          * FIXME: in case one target cannot
1487                          * be init'd, should the other ones
1488                          * be tried?
1489                          */
1490                         META_CANDIDATE_RESET( &candidates[ i ] );
1491                         if ( new_conn ) {
1492                                 mc->mc_refcnt = 0;
1493                                 meta_back_conn_free( mc );
1494
1495                         } else {
1496                                 meta_back_release_conn( mi, mc );
1497                         }
1498                         return NULL;
1499                 }
1500
1501                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1502                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1503                 }
1504
1505                 candidates[ i ].sr_err = LDAP_SUCCESS;
1506                 META_CANDIDATE_SET( &candidates[ i ] );
1507                 ncandidates++;
1508
1509                 if ( candidate ) {
1510                         *candidate = i;
1511                 }
1512
1513         /*
1514          * if no unique candidate ...
1515          */
1516         } else {
1517
1518                 /* Looks like we didn't get a bind. Open a new session... */
1519                 if ( mc == NULL ) {
1520                         assert( new_conn == 0 );
1521                         mc = metaconn_alloc( op );
1522                         mc->mc_conn = mc_curr.mc_conn;
1523                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1524                         new_conn = 1;
1525                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1526                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1527
1528                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1529                                 LDAP_BACK_CONN_ISANON_SET( mc );
1530                         }
1531                 }
1532
1533                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1534                         metatarget_t            *mt = mi->mi_targets[ i ];
1535
1536                         META_CANDIDATE_RESET( &candidates[ i ] );
1537
1538                         if ( i == cached
1539                                 || meta_back_is_candidate( mt, &op->o_req_ndn,
1540                                         op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_SUBTREE ) )
1541                         {
1542
1543                                 /*
1544                                  * The target is activated; if needed, it is
1545                                  * also init'd
1546                                  */
1547                                 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1548                                         LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1549                                         LDAP_BACK_DONTSEND, !new_conn );
1550                                 candidates[ i ].sr_err = lerr;
1551                                 if ( lerr == LDAP_SUCCESS ) {
1552                                         META_CANDIDATE_SET( &candidates[ i ] );
1553                                         ncandidates++;
1554
1555                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1556                                                 op->o_log_prefix, i, 0 );
1557
1558                                 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1559                                         META_CANDIDATE_SET( &candidates[ i ] );
1560
1561                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1562                                                 op->o_log_prefix, i,
1563                                                 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1564
1565                                 } else {
1566
1567                                         /*
1568                                          * FIXME: in case one target cannot
1569                                          * be init'd, should the other ones
1570                                          * be tried?
1571                                          */
1572                                         if ( new_conn ) {
1573                                                 ( void )meta_clear_one_candidate( op, mc, i );
1574                                         }
1575                                         /* leave the target candidate, but record the error for later use */
1576                                         err = lerr;
1577
1578                                         if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1579                                                 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined err=%d\n",
1580                                                         op->o_log_prefix, i, lerr );
1581
1582                                         } else {
1583                                                 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed err=%d\n",
1584                                                         op->o_log_prefix, i, lerr );
1585                                         }
1586
1587                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1588                                                 if ( sendok & LDAP_BACK_SENDERR ) {
1589                                                         send_ldap_result( op, rs );
1590                                                 }
1591                                                 if ( new_conn ) {
1592                                                         mc->mc_refcnt = 0;
1593                                                         meta_back_conn_free( mc );
1594
1595                                                 } else {
1596                                                         meta_back_release_conn( mi, mc );
1597                                                 }
1598
1599                                                 return NULL;
1600                                         }
1601
1602                                         continue;
1603                                 }
1604
1605                         } else {
1606                                 if ( new_conn ) {
1607                                         ( void )meta_clear_one_candidate( op, mc, i );
1608                                 }
1609                         }
1610                 }
1611
1612                 if ( ncandidates == 0 ) {
1613                         if ( new_conn ) {
1614                                 mc->mc_refcnt = 0;
1615                                 meta_back_conn_free( mc );
1616
1617                         } else {
1618                                 meta_back_release_conn( mi, mc );
1619                         }
1620
1621                         if ( rs->sr_err == LDAP_SUCCESS ) {
1622                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1623                                 rs->sr_text = "Unable to select valid candidates";
1624                         }
1625
1626                         if ( sendok & LDAP_BACK_SENDERR ) {
1627                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1628                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1629                                 }
1630                                 send_ldap_result( op, rs );
1631                                 rs->sr_matched = NULL;
1632                         }
1633
1634                         return NULL;
1635                 }
1636         }
1637
1638 done:;
1639         /* clear out meta_back_init_one_conn non-fatal errors */
1640         rs->sr_err = LDAP_SUCCESS;
1641         rs->sr_text = NULL;
1642
1643         /* touch the timestamp */
1644         if ( mi->mi_idle_timeout != 0 ) {
1645                 mc->mc_time = op->o_time;
1646         }
1647
1648         if ( new_conn ) {
1649                 if ( mi->mi_conn_ttl ) {
1650                         mc->mc_create_time = op->o_time;
1651                 }
1652
1653                 /*
1654                  * Inserts the newly created metaconn in the avl tree
1655                  */
1656                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1657 #if META_BACK_PRINT_CONNTREE > 0
1658                 meta_back_print_conntree( mi, ">>> meta_back_getconn" );
1659 #endif /* META_BACK_PRINT_CONNTREE */
1660
1661                 err = 0;
1662                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1663                         if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) {
1664                                 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1665                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++;
1666                                 LDAP_BACK_CONN_CACHED_SET( mc );
1667
1668                         } else {
1669                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1670                         }
1671                         rs->sr_err = 0;
1672
1673                 } else if ( !( sendok & LDAP_BACK_BINDING ) ) {
1674                         err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1675                                 meta_back_conndn_cmp, meta_back_conndn_dup );
1676                         LDAP_BACK_CONN_CACHED_SET( mc );
1677                 }
1678
1679 #if META_BACK_PRINT_CONNTREE > 0
1680                 meta_back_print_conntree( mi, "<<< meta_back_getconn" );
1681 #endif /* META_BACK_PRINT_CONNTREE */
1682                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1683
1684                 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1685                         /*
1686                          * Err could be -1 in case a duplicate metaconn is inserted
1687                          */
1688                         switch ( err ) {
1689                         case 0:
1690                                 break;
1691
1692                         case -1:
1693                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1694                                 /* duplicate: free and try to get the newly created one */
1695                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1696                                         mc->mc_refcnt = 0;
1697                                         meta_back_conn_free( mc );
1698
1699                                         new_conn = 0;
1700                                         goto retry_lock;
1701                                 }
1702
1703                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1704                                 break;
1705
1706                         default:
1707                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1708                                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
1709                                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1710                                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1711
1712                                         Debug( LDAP_DEBUG_ANY,
1713                                                 "%s meta_back_getconn: candidates=%d conn=%s insert failed\n",
1714                                                 op->o_log_prefix, ncandidates, buf );
1715                                 }
1716
1717                                 mc->mc_refcnt = 0;
1718                                 meta_back_conn_free( mc );
1719
1720                                 rs->sr_err = LDAP_OTHER;
1721                                 rs->sr_text = "Proxy bind collision";
1722                                 if ( sendok & LDAP_BACK_SENDERR ) {
1723                                         send_ldap_result( op, rs );
1724                                 }
1725                                 return NULL;
1726                         }
1727                 }
1728
1729                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1730                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1731                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1732
1733                         Debug( LDAP_DEBUG_TRACE,
1734                                 "%s meta_back_getconn: candidates=%d conn=%s inserted\n",
1735                                 op->o_log_prefix, ncandidates, buf );
1736                 }
1737
1738         } else {
1739                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1740                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1741                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1742
1743                         Debug( LDAP_DEBUG_TRACE,
1744                                 "%s meta_back_getconn: candidates=%d conn=%s fetched\n",
1745                                 op->o_log_prefix, ncandidates, buf );
1746                 }
1747         }
1748
1749         return mc;
1750 }
1751
1752 void
1753 meta_back_release_conn_lock(
1754         metainfo_t              *mi,
1755         metaconn_t              *mc,
1756         int                     dolock )
1757 {
1758         assert( mc != NULL );
1759
1760         if ( dolock ) {
1761                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1762         }
1763         assert( mc->mc_refcnt > 0 );
1764         mc->mc_refcnt--;
1765         /* NOTE: the connection is removed if either it is tainted
1766          * or if it is shared and no one else is using it.  This needs
1767          * to occur because for intrinsic reasons cached connections
1768          * that are not privileged would live forever and pollute
1769          * the connection space (and eat up resources).  Maybe this
1770          * should be configurable... */
1771         if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) {
1772 #if META_BACK_PRINT_CONNTREE > 0
1773                 meta_back_print_conntree( mi, ">>> meta_back_release_conn" );
1774 #endif /* META_BACK_PRINT_CONNTREE */
1775
1776                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1777                         if ( mc->mc_q.tqe_prev != NULL ) {
1778                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
1779                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1780                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1781                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1782                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1783
1784                         } else {
1785                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1786                         }
1787
1788                 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) {
1789                         metaconn_t      *tmpmc;
1790
1791                         tmpmc = avl_delete( &mi->mi_conninfo.lai_tree,
1792                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
1793
1794                         /* Overparanoid, but useful... */
1795                         assert( tmpmc == NULL || tmpmc == mc );
1796                 }
1797
1798                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1799
1800 #if META_BACK_PRINT_CONNTREE > 0
1801                 meta_back_print_conntree( mi, "<<< meta_back_release_conn" );
1802 #endif /* META_BACK_PRINT_CONNTREE */
1803
1804                 if ( mc->mc_refcnt == 0 ) {
1805                         meta_back_conn_free( mc );
1806                         mc = NULL;
1807                 }
1808         }
1809
1810         if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) {
1811                 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1812         }
1813
1814         if ( dolock ) {
1815                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1816         }
1817 }
1818
1819 void
1820 meta_back_quarantine(
1821         Operation       *op,
1822         SlapReply       *rs,
1823         int             candidate )
1824 {
1825         metainfo_t              *mi = (metainfo_t *)op->o_bd->be_private;
1826         metatarget_t            *mt = mi->mi_targets[ candidate ];
1827
1828         slap_retry_info_t       *ri = &mt->mt_quarantine;
1829
1830         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1831
1832         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1833                 time_t  new_last = slap_get_time();
1834
1835                 switch ( mt->mt_isquarantined ) {
1836                 case LDAP_BACK_FQ_NO:
1837                         if ( ri->ri_last == new_last ) {
1838                                 goto done;
1839                         }
1840
1841                         Debug( LDAP_DEBUG_ANY,
1842                                 "%s meta_back_quarantine[%d]: enter.\n",
1843                                 op->o_log_prefix, candidate, 0 );
1844
1845                         ri->ri_idx = 0;
1846                         ri->ri_count = 0;
1847                         break;
1848
1849                 case LDAP_BACK_FQ_RETRYING:
1850                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
1851                                 char    buf[ SLAP_TEXT_BUFLEN ];
1852
1853                                 snprintf( buf, sizeof( buf ),
1854                                         "meta_back_quarantine[%d]: block #%d try #%d failed",
1855                                         candidate, ri->ri_idx, ri->ri_count );
1856                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1857                                         op->o_log_prefix, buf, 0 );
1858                         }
1859
1860                         ++ri->ri_count;
1861                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1862                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1863                         {
1864                                 ri->ri_count = 0;
1865                                 ++ri->ri_idx;
1866                         }
1867                         break;
1868
1869                 default:
1870                         break;
1871                 }
1872
1873                 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1874                 ri->ri_last = new_last;
1875
1876         } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1877                 Debug( LDAP_DEBUG_ANY,
1878                         "%s meta_back_quarantine[%d]: exit.\n",
1879                         op->o_log_prefix, candidate, 0 );
1880
1881                 if ( mi->mi_quarantine_f ) {
1882                         (void)mi->mi_quarantine_f( mi, candidate,
1883                                 mi->mi_quarantine_p );
1884                 }
1885
1886                 ri->ri_count = 0;
1887                 ri->ri_idx = 0;
1888                 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1889         }
1890
1891 done:;
1892         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
1893 }