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 1999-2010 The OpenLDAP Foundation.
   5  * Portions Copyright 2001-2003 Pierangelo Masarati.
   6  * Portions Copyright 1999-2003 Howard Chu.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by the Howard Chu for inclusion
  19  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  20  * Masarati.
  21  */
  22
  23 #include "portable.h"
  24
  25 #include <stdio.h>
  26
  27 #include <ac/errno.h>
  28 #include <ac/socket.h>
  29 #include <ac/string.h>
  30
  31
  32 #define AVL_INTERNAL
  33 #include "slap.h"
  34 #include "../back-ldap/back-ldap.h"
  35 #include "back-meta.h"
  36
  37 /*
  38  * meta_back_conndn_cmp
  39  *
  40  * compares two struct metaconn based on the value of the conn pointer
  41  * and of the local DN; used by avl stuff
  42  */
  43 int
  44 meta_back_conndn_cmp(
  45         const void *c1,
  46         const void *c2 )
  47 {
  48         metaconn_t      *mc1 = ( metaconn_t * )c1;
  49         metaconn_t      *mc2 = ( metaconn_t * )c2;
  50         int             rc;
  51
  52         /* If local DNs don't match, it is definitely not a match */
  53         /* For shared sessions, conn is NULL. Only explicitly
  54          * bound sessions will have non-NULL conn.
  55          */
  56         rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
  57         if ( rc == 0 ) {
  58                 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
  59         }
  60
  61         return rc;
  62 }
  63
  64 /*
  65  * meta_back_conndnmc_cmp
  66  *
  67  * compares two struct metaconn based on the value of the conn pointer,
  68  * the local DN and the struct pointer; used by avl stuff
  69  */
  70 static int
  71 meta_back_conndnmc_cmp(
  72         const void *c1,
  73         const void *c2 )
  74 {
  75         metaconn_t      *mc1 = ( metaconn_t * )c1;
  76         metaconn_t      *mc2 = ( metaconn_t * )c2;
  77         int             rc;
  78
  79         /* If local DNs don't match, it is definitely not a match */
  80         /* For shared sessions, conn is NULL. Only explicitly
  81          * bound sessions will have non-NULL conn.
  82          */
  83         rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
  84         if ( rc == 0 ) {
  85                 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
  86                 if ( rc == 0 ) {
  87                         rc = SLAP_PTRCMP( mc1, mc2 );
  88                 }
  89         }
  90
  91         return rc;
  92 }
  93
  94 /*
  95  * meta_back_conn_cmp
  96  *
  97  * compares two struct metaconn based on the value of the conn pointer;
  98  * used by avl stuff
  99  */
 100 int
 101 meta_back_conn_cmp(
 102         const void *c1,
 103         const void *c2 )
 104 {
 105         metaconn_t      *mc1 = ( metaconn_t * )c1;
 106         metaconn_t      *mc2 = ( metaconn_t * )c2;
 107
 108         /* For shared sessions, conn is NULL. Only explicitly
 109          * bound sessions will have non-NULL conn.
 110          */
 111         return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
 112 }
 113
 114 /*
 115  * meta_back_conndn_dup
 116  *
 117  * returns -1 in case a duplicate struct metaconn has been inserted;
 118  * used by avl stuff
 119  */
 120 int
 121 meta_back_conndn_dup(
 122         void *c1,
 123         void *c2 )
 124 {
 125         metaconn_t      *mc1 = ( metaconn_t * )c1;
 126         metaconn_t      *mc2 = ( metaconn_t * )c2;
 127
 128         /* Cannot have more than one shared session with same DN */
 129         if ( mc1->mc_conn == mc2->mc_conn &&
 130                 dn_match( &mc1->mc_local_ndn, &mc2->mc_local_ndn ) )
 131         {
 132                 return -1;
 133         }
 134
 135         return 0;
 136 }
 137
 138 /*
 139  * Debug stuff (got it from libavl)
 140  */
 141 #if META_BACK_PRINT_CONNTREE > 0
 142 static void
 143 meta_back_print( metaconn_t *mc, char *avlstr )
 144 {
 145         int     i;
 146
 147         fputs( "targets=[", stderr );
 148         for ( i = 0; i < mc->mc_info->mi_ntargets; i++ ) {
 149                 fputc( mc->mc_conns[ i ].msc_ld ? '*' : 'o', stderr);
 150         }
 151         fputc( ']', stderr );
 152
 153         fprintf( stderr, " mc=%p local=\"%s\" conn=%p refcnt=%d%s %s\n",
 154                 (void *)mc,
 155                 mc->mc_local_ndn.bv_val ? mc->mc_local_ndn.bv_val : "",
 156                 (void *)mc->mc_conn,
 157                 mc->mc_refcnt,
 158                 LDAP_BACK_CONN_TAINTED( mc ) ? " tainted" : "",
 159                 avlstr );
 160 }
 161
 162 static void
 163 meta_back_ravl_print( Avlnode *root, int depth )
 164 {
 165         int             i;
 166
 167         if ( root == 0 ) {
 168                 return;
 169         }
 170
 171         meta_back_ravl_print( root->avl_right, depth + 1 );
 172
 173         for ( i = 0; i < depth; i++ ) {
 174                 fprintf( stderr, "-" );
 175         }
 176         fputc( ' ', stderr );
 177
 178         meta_back_print( (metaconn_t *)root->avl_data,
 179                 avl_bf2str( root->avl_bf ) );
 180
 181         meta_back_ravl_print( root->avl_left, depth + 1 );
 182 }
 183
 184 /* NOTE: duplicate from back-ldap/bind.c */
 185 static char* priv2str[] = {
 186         "privileged",
 187         "privileged/TLS",
 188         "anonymous",
 189         "anonymous/TLS",
 190         "bind",
 191         "bind/TLS",
 192         NULL
 193 };
 194
 195 void
 196 meta_back_print_conntree( metainfo_t *mi, char *msg )
 197 {
 198         int     c;
 199
 200         fprintf( stderr, "========> %s\n", msg );
 201
 202         for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) {
 203                 int             i = 0;
 204                 metaconn_t      *mc;
 205
 206                 fprintf( stderr, "  %s[%d]\n", priv2str[ c ], mi->mi_conn_priv[ c ].mic_num );
 207
 208                 LDAP_TAILQ_FOREACH( mc, &mi->mi_conn_priv[ c ].mic_priv, mc_q )
 209                 {
 210                         fprintf( stderr, "    [%d] ", i );
 211                         meta_back_print( mc, "" );
 212                         i++;
 213                 }
 214         }
 215
 216         if ( mi->mi_conninfo.lai_tree == NULL ) {
 217                 fprintf( stderr, "\t(empty)\n" );
 218
 219         } else {
 220                 meta_back_ravl_print( mi->mi_conninfo.lai_tree, 0 );
 221         }
 222
 223         fprintf( stderr, "<======== %s\n", msg );
 224 }
 225 #endif /* META_BACK_PRINT_CONNTREE */
 226 /*
 227  * End of debug stuff
 228  */
 229
 230 /*
 231  * metaconn_alloc
 232  *
 233  * Allocates a connection structure, making room for all the referenced targets
 234  */
 235 static metaconn_t *
 236 metaconn_alloc(
 237         Operation               *op )
 238 {
 239         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 240         metaconn_t      *mc;
 241         int             ntargets = mi->mi_ntargets;
 242
 243         assert( ntargets > 0 );
 244
 245         /* malloc all in one */
 246         mc = ( metaconn_t * )ch_calloc( 1, sizeof( metaconn_t )
 247                 + sizeof( metasingleconn_t ) * ( ntargets - 1 ) );
 248         if ( mc == NULL ) {
 249                 return NULL;
 250         }
 251
 252         mc->mc_info = mi;
 253
 254         mc->mc_authz_target = META_BOUND_NONE;
 255         mc->mc_refcnt = 1;
 256
 257         return mc;
 258 }
 259
 260 /*
 261  * meta_back_init_one_conn
 262  *
 263  * Initializes one connection
 264  */
 265 int
 266 meta_back_init_one_conn(
 267         Operation               *op,
 268         SlapReply               *rs,
 269         metaconn_t              *mc,
 270         int                     candidate,
 271         int                     ispriv,
 272         ldap_back_send_t        sendok,
 273         int                     dolock )
 274 {
 275         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 276         metatarget_t            *mt = mi->mi_targets[ candidate ];
 277         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 278         int                     version;
 279         dncookie                dc;
 280         int                     isauthz = ( candidate == mc->mc_authz_target );
 281         int                     do_return = 0;
 282 #ifdef HAVE_TLS
 283         int                     is_ldaps = 0;
 284 #endif /* HAVE_TLS */
 285
 286         /* if the server is quarantined, and
 287          * - the current interval did not expire yet, or
 288          * - no more retries should occur,
 289          * don't return the connection */
 290         if ( mt->mt_isquarantined ) {
 291                 slap_retry_info_t       *ri = &mt->mt_quarantine;
 292                 int                     dont_retry = 0;
 293
 294                 if ( mt->mt_quarantine.ri_interval ) {
 295                         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
 296                         dont_retry = ( mt->mt_isquarantined > LDAP_BACK_FQ_NO );
 297                         if ( dont_retry ) {
 298                                 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 299                                         || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 300                                 if ( !dont_retry ) {
 301                                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
 302                                                 char    buf[ SLAP_TEXT_BUFLEN ];
 303
 304                                                 snprintf( buf, sizeof( buf ),
 305                                                         "meta_back_init_one_conn[%d]: quarantine "
 306                                                         "retry block #%d try #%d",
 307                                                         candidate, ri->ri_idx, ri->ri_count );
 308                                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
 309                                                         op->o_log_prefix, buf, 0 );
 310                                         }
 311
 312                                         mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING;
 313                                 }
 314
 315                         }
 316                         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
 317                 }
 318
 319                 if ( dont_retry ) {
 320                         rs->sr_err = LDAP_UNAVAILABLE;
 321                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 322                                 rs->sr_text = "Target is quarantined";
 323                                 send_ldap_result( op, rs );
 324                         }
 325                         return rs->sr_err;
 326                 }
 327         }
 328
 329 retry_lock:;
 330         if ( dolock ) {
 331                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 332         }
 333
 334         /*
 335          * Already init'ed
 336          */
 337         if ( LDAP_BACK_CONN_ISBOUND( msc )
 338                 || LDAP_BACK_CONN_ISANON( msc ) )
 339         {
 340                 assert( msc->msc_ld != NULL );
 341                 rs->sr_err = LDAP_SUCCESS;
 342                 do_return = 1;
 343
 344         } else if ( META_BACK_CONN_CREATING( msc )
 345                 || LDAP_BACK_CONN_BINDING( msc ) )
 346         {
 347                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
 348                         if ( dolock ) {
 349                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 350                         }
 351
 352                         ldap_pvt_thread_yield();
 353                         goto retry_lock;
 354                 }
 355
 356                 /* sounds more appropriate */
 357                 rs->sr_err = LDAP_BUSY;
 358                 rs->sr_text = "No connections to target are available";
 359                 do_return = 1;
 360
 361         } else if ( META_BACK_CONN_INITED( msc ) ) {
 362                 assert( msc->msc_ld != NULL );
 363                 rs->sr_err = LDAP_SUCCESS;
 364                 do_return = 1;
 365
 366         } else {
 367                 /*
 368                  * creating...
 369                  */
 370                 META_BACK_CONN_CREATING_SET( msc );
 371         }
 372
 373         if ( dolock ) {
 374                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 375         }
 376
 377         if ( do_return ) {
 378                 if ( rs->sr_err != LDAP_SUCCESS
 379                         && op->o_conn
 380                         && ( sendok & LDAP_BACK_SENDERR ) )
 381                 {
 382                         send_ldap_result( op, rs );
 383                 }
 384
 385                 return rs->sr_err;
 386         }
 387
 388         assert( msc->msc_ld == NULL );
 389
 390         /*
 391          * Attempts to initialize the connection to the target ds
 392          */
 393         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 394         rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
 395 #ifdef HAVE_TLS
 396         is_ldaps = ldap_is_ldaps_url( mt->mt_uri );
 397 #endif /* HAVE_TLS */
 398         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 399         if ( rs->sr_err != LDAP_SUCCESS ) {
 400                 goto error_return;
 401         }
 402
 403         /*
 404          * Set LDAP version. This will always succeed: If the client
 405          * bound with a particular version, then so can we.
 406          */
 407         if ( mt->mt_version != 0 ) {
 408                 version = mt->mt_version;
 409
 410         } else if ( op->o_conn->c_protocol != 0 ) {
 411                 version = op->o_conn->c_protocol;
 412
 413         } else {
 414                 version = LDAP_VERSION3;
 415         }
 416         ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version );
 417         ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p );
 418
 419         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 420         ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
 421                 META_BACK_TGT_CHASE_REFERRALS( mt ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 422
 423 #ifdef HAVE_TLS
 424         /* start TLS ("tls [try-]{start|propagate}" statement) */
 425         if ( ( META_BACK_TGT_USE_TLS( mt )
 426                 || ( op->o_conn->c_is_tls
 427                         && META_BACK_TGT_PROPAGATE_TLS( mt ) ) )
 428                 && !is_ldaps )
 429         {
 430 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 431                 /*
 432                  * use asynchronous StartTLS; in case, chase referral
 433                  * FIXME: OpenLDAP does not return referral on StartTLS yet
 434                  */
 435                 int             msgid;
 436
 437                 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
 438                 if ( rs->sr_err == LDAP_SUCCESS ) {
 439                         LDAPMessage     *res = NULL;
 440                         int             rc, nretries = mt->mt_nretries;
 441                         struct timeval  tv;
 442
 443                         LDAP_BACK_TV_SET( &tv );
 444
 445 retry:;
 446                         rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 447                         switch ( rc ) {
 448                         case -1:
 449                                 rs->sr_err = LDAP_OTHER;
 450                                 break;
 451
 452                         case 0:
 453                                 if ( nretries != 0 ) {
 454                                         if ( nretries > 0 ) {
 455                                                 nretries--;
 456                                         }
 457                                         LDAP_BACK_TV_SET( &tv );
 458                                         goto retry;
 459                                 }
 460                                 rs->sr_err = LDAP_OTHER;
 461                                 break;
 462
 463                         default:
 464                                 /* only touch when activity actually took place... */
 465                                 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
 466                                         msc->msc_time = op->o_time;
 467                                 }
 468                                 break;
 469                         }
 470
 471                         if ( rc == LDAP_RES_EXTENDED ) {
 472                                 struct berval   *data = NULL;
 473
 474                                 /* NOTE: right now, data is unused, so don't get it */
 475                                 rs->sr_err = ldap_parse_extended_result( msc->msc_ld,
 476                                         res, NULL, NULL /* &data */ , 0 );
 477                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 478                                         int             err;
 479
 480                                         /* FIXME: matched? referrals? response controls? */
 481                                         rs->sr_err = ldap_parse_result( msc->msc_ld,
 482                                                 res, &err, NULL, NULL, NULL, NULL, 1 );
 483                                         res = NULL;
 484
 485                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 486                                                 rs->sr_err = err;
 487                                         }
 488                                         rs->sr_err = slap_map_api2result( rs );
 489
 490                                         /* FIXME: in case a referral
 491                                          * is returned, should we try
 492                                          * using it instead of the
 493                                          * configured URI? */
 494                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 495                                                 ldap_install_tls( msc->msc_ld );
 496
 497                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 498                                                 /* FIXME: LDAP_OPERATIONS_ERROR? */
 499                                                 rs->sr_err = LDAP_OTHER;
 500                                                 rs->sr_text = "Unwilling to chase referral "
 501                                                         "returned by Start TLS exop";
 502                                         }
 503
 504                                         if ( data ) {
 505                                                 ber_bvfree( data );
 506                                         }
 507                                 }
 508
 509                         } else {
 510                                 rs->sr_err = LDAP_OTHER;
 511                         }
 512
 513                         if ( res != NULL ) {
 514                                 ldap_msgfree( res );
 515                         }
 516                 }
 517 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 518                 /*
 519                  * use synchronous StartTLS
 520                  */
 521                 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
 522 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 523
 524                 /* if StartTLS is requested, only attempt it if the URL
 525                  * is not "ldaps://"; this may occur not only in case
 526                  * of misconfiguration, but also when used in the chain
 527                  * overlay, where the "uri" can be parsed out of a referral */
 528                 if ( rs->sr_err == LDAP_SERVER_DOWN
 529                         || ( rs->sr_err != LDAP_SUCCESS
 530                                 && META_BACK_TGT_TLS_CRITICAL( mt ) ) )
 531                 {
 532
 533 #ifdef DEBUG_205
 534                         Debug( LDAP_DEBUG_ANY,
 535                                 "### %s meta_back_init_one_conn(TLS) "
 536                                 "ldap_unbind_ext[%d] ld=%p\n",
 537                                 op->o_log_prefix, candidate,
 538                                 (void *)msc->msc_ld );
 539 #endif /* DEBUG_205 */
 540
 541                         /* need to trash a failed Start TLS */
 542                         meta_clear_one_candidate( op, mc, candidate );
 543                         goto error_return;
 544                 }
 545         }
 546 #endif /* HAVE_TLS */
 547
 548         /*
 549          * Set the network timeout if set
 550          */
 551         if ( mt->mt_network_timeout != 0 ) {
 552                 struct timeval  network_timeout;
 553
 554                 network_timeout.tv_usec = 0;
 555                 network_timeout.tv_sec = mt->mt_network_timeout;
 556
 557                 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
 558                                 (void *)&network_timeout );
 559         }
 560
 561         /*
 562          * If the connection DN is not null, an attempt to rewrite it is made
 563          */
 564
 565         if ( ispriv ) {
 566                 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
 567                         ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
 568                         if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
 569                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 570                                         memset( msc->msc_cred.bv_val, 0,
 571                                                 msc->msc_cred.bv_len );
 572                                 }
 573                                 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
 574                         }
 575
 576                 } else {
 577                         ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
 578                 }
 579
 580         } else {
 581                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 582                         memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 583                         ber_memfree_x( msc->msc_cred.bv_val, NULL );
 584                         BER_BVZERO( &msc->msc_cred );
 585                 }
 586                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 587                         ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
 588                         BER_BVZERO( &msc->msc_bound_ndn );
 589                 }
 590                 if ( !BER_BVISEMPTY( &op->o_ndn )
 591                         && SLAP_IS_AUTHZ_BACKEND( op )
 592                         && isauthz )
 593                 {
 594                         dc.target = mt;
 595                         dc.conn = op->o_conn;
 596                         dc.rs = rs;
 597                         dc.ctx = "bindDN";
 598
 599                         /*
 600                          * Rewrite the bind dn if needed
 601                          */
 602                         if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
 603                                                 &msc->msc_bound_ndn ) )
 604                         {
 605
 606 #ifdef DEBUG_205
 607                                 Debug( LDAP_DEBUG_ANY,
 608                                         "### %s meta_back_init_one_conn(rewrite) "
 609                                         "ldap_unbind_ext[%d] ld=%p\n",
 610                                         op->o_log_prefix, candidate,
 611                                         (void *)msc->msc_ld );
 612 #endif /* DEBUG_205 */
 613
 614                                 /* need to trash a connection not fully established */
 615                                 meta_clear_one_candidate( op, mc, candidate );
 616                                 goto error_return;
 617                         }
 618
 619                         /* copy the DN if needed */
 620                         if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
 621                                 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
 622                         }
 623
 624                         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 625
 626                 } else {
 627                         ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
 628                 }
 629         }
 630
 631         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 632
 633 error_return:;
 634         if ( dolock ) {
 635                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 636         }
 637         META_BACK_CONN_CREATING_CLEAR( msc );
 638         if ( rs->sr_err == LDAP_SUCCESS ) {
 639                 /*
 640                  * Sets a cookie for the rewrite session
 641                  */
 642                 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
 643                 META_BACK_CONN_INITED_SET( msc );
 644         }
 645         if ( dolock ) {
 646                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 647         }
 648
 649         if ( rs->sr_err != LDAP_SUCCESS ) {
 650                 rs->sr_err = slap_map_api2result( rs );
 651                 if ( sendok & LDAP_BACK_SENDERR ) {
 652                         send_ldap_result( op, rs );
 653                 }
 654         }
 655
 656         return rs->sr_err;
 657 }
 658
 659 /*
 660  * meta_back_retry
 661  *
 662  * Retries one connection
 663  */
 664 int
 665 meta_back_retry(
 666         Operation               *op,
 667         SlapReply               *rs,
 668         metaconn_t              **mcp,
 669         int                     candidate,
 670         ldap_back_send_t        sendok )
 671 {
 672         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 673         metatarget_t            *mt = mi->mi_targets[ candidate ];
 674         metaconn_t              *mc = *mcp;
 675         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 676         int                     rc = LDAP_UNAVAILABLE,
 677                                 binding,
 678                                 quarantine = 1;
 679
 680         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 681
 682         assert( !META_BACK_CONN_CREATING( msc ) );
 683         binding = LDAP_BACK_CONN_BINDING( msc );
 684         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 685
 686         assert( mc->mc_refcnt > 0 );
 687         if ( mc->mc_refcnt == 1 ) {
 688                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
 689                         char    buf[ SLAP_TEXT_BUFLEN ];
 690
 691                         /* this lock is required; however,
 692                          * it's invoked only when logging is on */
 693                         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 694                         snprintf( buf, sizeof( buf ),
 695                                 "retrying URI=\"%s\" DN=\"%s\"",
 696                                 mt->mt_uri,
 697                                 BER_BVISNULL( &msc->msc_bound_ndn ) ?
 698                                         "" : msc->msc_bound_ndn.bv_val );
 699                         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 700
 701                         Debug( LDAP_DEBUG_ANY,
 702                                 "%s meta_back_retry[%d]: %s.\n",
 703                                 op->o_log_prefix, candidate, buf );
 704                 }
 705
 706                 meta_clear_one_candidate( op, mc, candidate );
 707                 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 708
 709                 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 710
 711                 /* mc here must be the regular mc, reset and ready for init */
 712                 rc = meta_back_init_one_conn( op, rs, mc, candidate,
 713                         LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 );
 714
 715                 /* restore the "binding" flag, in case */
 716                 if ( binding ) {
 717                         LDAP_BACK_CONN_BINDING_SET( msc );
 718                 }
 719
 720                 if ( rc == LDAP_SUCCESS ) {
 721                         quarantine = 0;
 722                         rc = meta_back_single_dobind( op, rs, mcp, candidate,
 723                                 sendok, mt->mt_nretries, 0 );
 724
 725                         Debug( LDAP_DEBUG_ANY,
 726                                 "%s meta_back_retry[%d]: "
 727                                 "meta_back_single_dobind=%d\n",
 728                                 op->o_log_prefix, candidate, rc );
 729                         if ( rc == LDAP_SUCCESS ) {
 730                                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
 731                                         !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 732                                 {
 733                                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 734
 735                                 } else {
 736                                         LDAP_BACK_CONN_ISANON_SET( msc );
 737                                 }
 738
 739                                 /* when bound, dispose of the "binding" flag */
 740                                 if ( binding ) {
 741                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 742                                 }
 743                         }
 744                 }
 745
 746                 /* don't send twice */
 747                 sendok &= ~LDAP_BACK_SENDERR;
 748         }
 749
 750         if ( rc != LDAP_SUCCESS ) {
 751                 SlapReply               *candidates = meta_back_candidates_get( op );
 752
 753                 candidates[ candidate ].sr_err = rc;
 754
 755                 if ( *mcp != NULL ) {
 756                         if ( mc->mc_refcnt == 1 ) {
 757                                 if ( binding ) {
 758                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 759                                 }
 760                                 (void)meta_clear_one_candidate( op, mc, candidate );
 761                         }
 762
 763                         LDAP_BACK_CONN_TAINTED_SET( mc );
 764                         /* only release if mandatory; otherwise
 765                          * let the caller do what's best before
 766                          * releasing */
 767                         if ( META_BACK_ONERR_STOP( mi ) ) {
 768                                 meta_back_release_conn_lock( mi, mc, 0 );
 769                                 *mcp = NULL;
 770
 771                         } else {
 772 #if META_BACK_PRINT_CONNTREE > 0
 773                                 meta_back_print_conntree( mi, ">>> meta_back_retry" );
 774 #endif /* META_BACK_PRINT_CONNTREE */
 775
 776                                 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */
 777                                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
 778                                         if ( mc->mc_q.tqe_prev != NULL ) {
 779                                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
 780                                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
 781                                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
 782                                                         mc, mc_q );
 783                                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
 784                                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
 785
 786                                         } else {
 787                                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
 788                                         }
 789
 790                                 } else {
 791                                         /* FIXME: check if in tree, for consistency? */
 792                                         (void)avl_delete( &mi->mi_conninfo.lai_tree,
 793                                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
 794                                 }
 795                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
 796
 797 #if META_BACK_PRINT_CONNTREE > 0
 798                                 meta_back_print_conntree( mi, "<<< meta_back_retry" );
 799 #endif /* META_BACK_PRINT_CONNTREE */
 800                         }
 801                 }
 802
 803                 if ( sendok & LDAP_BACK_SENDERR ) {
 804                         rs->sr_err = rc;
 805                         rs->sr_text = "Unable to retry";
 806                         send_ldap_result( op, rs );
 807                 }
 808         }
 809
 810         if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) {
 811                 meta_back_quarantine( op, rs, candidate );
 812         }
 813
 814         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 815
 816         return rc == LDAP_SUCCESS ? 1 : 0;
 817 }
 818
 819 /*
 820  * callback for unique candidate selection
 821  */
 822 static int
 823 meta_back_conn_cb( Operation *op, SlapReply *rs )
 824 {
 825         assert( op->o_tag == LDAP_REQ_SEARCH );
 826
 827         switch ( rs->sr_type ) {
 828         case REP_SEARCH:
 829                 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
 830                 break;
 831
 832         case REP_SEARCHREF:
 833         case REP_RESULT:
 834                 break;
 835
 836         default:
 837                 return rs->sr_err;
 838         }
 839
 840         return 0;
 841 }
 842
 843
 844 static int
 845 meta_back_get_candidate(
 846         Operation       *op,
 847         SlapReply       *rs,
 848         struct berval   *ndn )
 849 {
 850         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 851         long            candidate;
 852
 853         /*
 854          * tries to get a unique candidate
 855          * (takes care of default target)
 856          */
 857         candidate = meta_back_select_unique_candidate( mi, ndn );
 858
 859         /*
 860          * if any is found, inits the connection
 861          */
 862         if ( candidate == META_TARGET_NONE ) {
 863                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 864                 rs->sr_text = "No suitable candidate target found";
 865
 866         } else if ( candidate == META_TARGET_MULTIPLE ) {
 867                 Operation       op2 = *op;
 868                 SlapReply       rs2 = { 0 };
 869                 slap_callback   cb2 = { 0 };
 870                 int             rc;
 871
 872                 /* try to get a unique match for the request ndn
 873                  * among the multiple candidates available */
 874                 op2.o_tag = LDAP_REQ_SEARCH;
 875                 op2.o_req_dn = *ndn;
 876                 op2.o_req_ndn = *ndn;
 877                 op2.ors_scope = LDAP_SCOPE_BASE;
 878                 op2.ors_deref = LDAP_DEREF_NEVER;
 879                 op2.ors_attrs = slap_anlist_no_attrs;
 880                 op2.ors_attrsonly = 0;
 881                 op2.ors_limit = NULL;
 882                 op2.ors_slimit = 1;
 883                 op2.ors_tlimit = SLAP_NO_LIMIT;
 884
 885                 op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
 886                 op2.ors_filterstr = *slap_filterstr_objectClass_pres;
 887
 888                 op2.o_callback = &cb2;
 889                 cb2.sc_response = meta_back_conn_cb;
 890                 cb2.sc_private = (void *)&candidate;
 891
 892                 rc = op->o_bd->be_search( &op2, &rs2 );
 893
 894                 switch ( rs2.sr_err ) {
 895                 case LDAP_SUCCESS:
 896                 default:
 897                         rs->sr_err = rs2.sr_err;
 898                         break;
 899
 900                 case LDAP_SIZELIMIT_EXCEEDED:
 901                         /* if multiple candidates can serve the operation,
 902                          * and a default target is defined, and it is
 903                          * a candidate, try using it (FIXME: YMMV) */
 904                         if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
 905                                 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
 906                                                 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
 907                         {
 908                                 candidate = mi->mi_defaulttarget;
 909                                 rs->sr_err = LDAP_SUCCESS;
 910                                 rs->sr_text = NULL;
 911
 912                         } else {
 913                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 914                                 rs->sr_text = "Unable to select unique candidate target";
 915                         }
 916                         break;
 917                 }
 918
 919         } else {
 920                 rs->sr_err = LDAP_SUCCESS;
 921         }
 922
 923         return candidate;
 924 }
 925
 926 static void     *meta_back_candidates_dummy;
 927
 928 static void
 929 meta_back_candidates_keyfree(
 930         void            *key,
 931         void            *data )
 932 {
 933         metacandidates_t        *mc = (metacandidates_t *)data;
 934
 935         ber_memfree_x( mc->mc_candidates, NULL );
 936         ber_memfree_x( data, NULL );
 937 }
 938
 939 SlapReply *
 940 meta_back_candidates_get( Operation *op )
 941 {
 942         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 943         metacandidates_t        *mc;
 944
 945         if ( op->o_threadctx ) {
 946                 void            *data = NULL;
 947
 948                 ldap_pvt_thread_pool_getkey( op->o_threadctx,
 949                                 &meta_back_candidates_dummy, &data, NULL );
 950                 mc = (metacandidates_t *)data;
 951
 952         } else {
 953                 mc = mi->mi_candidates;
 954         }
 955
 956         if ( mc == NULL ) {
 957                 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
 958                 mc->mc_ntargets = mi->mi_ntargets;
 959                 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
 960                 if ( op->o_threadctx ) {
 961                         void            *data = NULL;
 962
 963                         data = (void *)mc;
 964                         ldap_pvt_thread_pool_setkey( op->o_threadctx,
 965                                         &meta_back_candidates_dummy, data,
 966                                         meta_back_candidates_keyfree,
 967                                         NULL, NULL );
 968
 969                 } else {
 970                         mi->mi_candidates = mc;
 971                 }
 972
 973         } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
 974                 /* NOTE: in the future, may want to allow back-config
 975                  * to add/remove targets from back-meta... */
 976                 mc->mc_candidates = ch_realloc( mc->mc_candidates,
 977                                 sizeof( SlapReply ) * mi->mi_ntargets );
 978                 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
 979                         sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
 980                 mc->mc_ntargets = mi->mi_ntargets;
 981         }
 982
 983         return mc->mc_candidates;
 984 }
 985
 986 /*
 987  * meta_back_getconn
 988  *
 989  * Prepares the connection structure
 990  *
 991  * RATIONALE:
 992  *
 993  * - determine what DN is being requested:
 994  *
 995  *      op      requires candidate      checks
 996  *
 997  *      add     unique                  parent of o_req_ndn
 998  *      bind    unique^*[/all]          o_req_ndn [no check]
 999  *      compare unique^+                o_req_ndn
1000  *      delete  unique                  o_req_ndn
1001  *      modify  unique                  o_req_ndn
1002  *      search  any                     o_req_ndn
1003  *      modrdn  unique[, unique]        o_req_ndn[, orr_nnewSup]
1004  *
1005  * - for ops that require the candidate to be unique, in case of multiple
1006  *   occurrences an internal search with sizeLimit=1 is performed
1007  *   if a unique candidate can actually be determined.  If none is found,
1008  *   the operation aborts; if multiple are found, the default target
1009  *   is used if defined and candidate; otherwise the operation aborts.
1010  *
1011  * *^note: actually, the bind operation is handled much like a search;
1012  *   i.e. the bind is broadcast to all candidate targets.
1013  *
1014  * +^note: actually, the compare operation is handled much like a search;
1015  *   i.e. the compare is broadcast to all candidate targets, while checking
1016  *   that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
1017  *   returned.
1018  */
1019 metaconn_t *
1020 meta_back_getconn(
1021         Operation               *op,
1022         SlapReply               *rs,
1023         int                     *candidate,
1024         ldap_back_send_t        sendok )
1025 {
1026         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
1027         metaconn_t      *mc = NULL,
1028                         mc_curr = {{ 0 }};
1029         int             cached = META_TARGET_NONE,
1030                         i = META_TARGET_NONE,
1031                         err = LDAP_SUCCESS,
1032                         new_conn = 0,
1033                         ncandidates = 0;
1034
1035
1036         meta_op_type    op_type = META_OP_REQUIRE_SINGLE;
1037         enum            {
1038                 META_DNTYPE_ENTRY,
1039                 META_DNTYPE_PARENT,
1040                 META_DNTYPE_NEWPARENT
1041         }               dn_type = META_DNTYPE_ENTRY;
1042         struct berval   ndn = op->o_req_ndn,
1043                         pndn;
1044
1045         SlapReply       *candidates = meta_back_candidates_get( op );
1046
1047         /* Internal searches are privileged and shared. So is root. */
1048         if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) )
1049                 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) )
1050                 || op->o_do_not_cache || be_isroot( op ) )
1051         {
1052                 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
1053                 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
1054                 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op );
1055
1056         } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) )
1057         {
1058                 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1059                 BER_BVSTR( &mc_curr.mc_local_ndn, "" );
1060                 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1061
1062         } else {
1063                 mc_curr.mc_local_ndn = op->o_ndn;
1064
1065                 /* Explicit binds must not be shared */
1066                 if ( !BER_BVISEMPTY( &op->o_ndn )
1067                         || op->o_tag == LDAP_REQ_BIND
1068                         || SLAP_IS_AUTHZ_BACKEND( op ) )
1069                 {
1070                         mc_curr.mc_conn = op->o_conn;
1071
1072                 } else {
1073                         LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1074                         LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1075                 }
1076         }
1077
1078         /* Explicit Bind requests always get their own conn */
1079         if ( sendok & LDAP_BACK_BINDING ) {
1080                 mc_curr.mc_conn = op->o_conn;
1081
1082         } else {
1083                 /* Searches for a metaconn in the avl tree */
1084 retry_lock:;
1085                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1086                 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) {
1087                         /* lookup a conn that's not binding */
1088                         LDAP_TAILQ_FOREACH( mc,
1089                                 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv,
1090                                 mc_q )
1091                         {
1092                                 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) {
1093                                         break;
1094                                 }
1095                         }
1096
1097                         if ( mc != NULL ) {
1098                                 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1099                                         metaconn_t, mc_q ) )
1100                                 {
1101                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1102                                                 mc, mc_q );
1103                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1104                                         LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1105                                                 mc, mc_q );
1106                                 }
1107
1108                         } else if ( !LDAP_BACK_USE_TEMPORARIES( mi )
1109                                 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max )
1110                         {
1111                                 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv );
1112                         }
1113
1114
1115                 } else {
1116                         mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1117                                 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1118                 }
1119
1120                 if ( mc ) {
1121                         /* catch taint errors */
1122                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1123
1124                         /* Don't reuse connections while they're still binding
1125                          * NOTE: only makes sense for binds */
1126                         if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1127                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1128                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1129
1130                                         ldap_pvt_thread_yield();
1131                                         goto retry_lock;
1132                                 }
1133
1134                                 /* release conn, and create a temporary */
1135                                 mc = NULL;
1136
1137                         } else {
1138                                 if ( ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1139                                         || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
1140                                 {
1141 #if META_BACK_PRINT_CONNTREE > 0
1142                                         meta_back_print_conntree( mi,
1143                                                 ">>> meta_back_getconn(expired)" );
1144 #endif /* META_BACK_PRINT_CONNTREE */
1145
1146                                         /* don't let anyone else use this expired connection */
1147                                         if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1148                                                 if ( mc->mc_q.tqe_prev != NULL ) {
1149                                                         assert( LDAP_BACK_CONN_CACHED( mc ) );
1150                                                         assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1151                                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1152                                                                 mc, mc_q );
1153                                                         mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1154                                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1155
1156                                                 } else {
1157                                                         assert( !LDAP_BACK_CONN_CACHED( mc ) );
1158                                                 }
1159
1160                                         } else {
1161                                                 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1162                                                         (caddr_t)mc, meta_back_conndnmc_cmp );
1163                                         }
1164
1165 #if META_BACK_PRINT_CONNTREE > 0
1166                                         meta_back_print_conntree( mi,
1167                                                 "<<< meta_back_getconn(expired)" );
1168 #endif /* META_BACK_PRINT_CONNTREE */
1169                                         LDAP_BACK_CONN_TAINTED_SET( mc );
1170                                         LDAP_BACK_CONN_CACHED_CLEAR( mc );
1171
1172                                         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1173                                                 char buf[STRLENOF("4294967295U") + 1] = { 0 };
1174                                                 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1175
1176                                                 Debug( LDAP_DEBUG_TRACE,
1177                                                         "%s meta_back_getconn: mc=%p conn=%s expired (tainted).\n",
1178                                                         op->o_log_prefix, (void *)mc, buf );
1179                                         }
1180                                 }
1181
1182                                 mc->mc_refcnt++;
1183                         }
1184                 }
1185                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1186         }
1187
1188         switch ( op->o_tag ) {
1189         case LDAP_REQ_ADD:
1190                 /* if we go to selection, the entry must not exist,
1191                  * and we must be able to resolve the parent */
1192                 dn_type = META_DNTYPE_PARENT;
1193                 dnParent( &ndn, &pndn );
1194                 break;
1195
1196         case LDAP_REQ_MODRDN:
1197                 /* if nnewSuperior is not NULL, it must resolve
1198                  * to the same candidate as the req_ndn */
1199                 if ( op->orr_nnewSup ) {
1200                         dn_type = META_DNTYPE_NEWPARENT;
1201                 }
1202                 break;
1203
1204         case LDAP_REQ_BIND:
1205                 /* if bound as rootdn, the backend must bind to all targets
1206                  * with the administrative identity
1207                  * (unless pseoudoroot-bind-defer is TRUE) */
1208                 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
1209                         op_type = META_OP_REQUIRE_ALL;
1210                 }
1211                 break;
1212
1213         case LDAP_REQ_COMPARE:
1214         case LDAP_REQ_DELETE:
1215         case LDAP_REQ_MODIFY:
1216                 /* just a unique candidate */
1217                 break;
1218
1219         case LDAP_REQ_SEARCH:
1220                 /* allow multiple candidates for the searchBase */
1221                 op_type = META_OP_ALLOW_MULTIPLE;
1222                 break;
1223
1224         default:
1225                 /* right now, just break (exop?) */
1226                 break;
1227         }
1228
1229         /*
1230          * require all connections ...
1231          */
1232         if ( op_type == META_OP_REQUIRE_ALL ) {
1233
1234                 /* Looks like we didn't get a bind. Open a new session... */
1235                 if ( mc == NULL ) {
1236                         assert( new_conn == 0 );
1237                         mc = metaconn_alloc( op );
1238                         mc->mc_conn = mc_curr.mc_conn;
1239                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1240                         new_conn = 1;
1241                         if ( sendok & LDAP_BACK_BINDING ) {
1242                                 LDAP_BACK_CONN_BINDING_SET( mc );
1243                         }
1244                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1245                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1246
1247                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1248                                 LDAP_BACK_CONN_ISANON_SET( mc );
1249                         }
1250
1251                 } else if ( 0 ) {
1252                         /* TODO: if any of the connections is binding,
1253                          * release mc and create a new one */
1254                 }
1255
1256                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1257                         /*
1258                          * The target is activated; if needed, it is
1259                          * also init'd
1260                          */
1261                         candidates[ i ].sr_err = meta_back_init_one_conn( op,
1262                                 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1263                                 LDAP_BACK_DONTSEND, !new_conn );
1264                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1265                                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1266                                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1267                                 }
1268                                 META_CANDIDATE_SET( &candidates[ i ] );
1269                                 ncandidates++;
1270
1271                         } else {
1272
1273                                 /*
1274                                  * FIXME: in case one target cannot
1275                                  * be init'd, should the other ones
1276                                  * be tried?
1277                                  */
1278                                 META_CANDIDATE_RESET( &candidates[ i ] );
1279                                 err = candidates[ i ].sr_err;
1280                                 continue;
1281                         }
1282                 }
1283
1284                 if ( ncandidates == 0 ) {
1285                         if ( new_conn ) {
1286                                 mc->mc_refcnt = 0;
1287                                 meta_back_conn_free( mc );
1288
1289                         } else {
1290                                 meta_back_release_conn( mi, mc );
1291                         }
1292
1293                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
1294                         rs->sr_text = "Unable to select valid candidates";
1295
1296                         if ( sendok & LDAP_BACK_SENDERR ) {
1297                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1298                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1299                                 }
1300                                 send_ldap_result( op, rs );
1301                                 rs->sr_matched = NULL;
1302                         }
1303
1304                         return NULL;
1305                 }
1306
1307                 goto done;
1308         }
1309
1310         /*
1311          * looks in cache, if any
1312          */
1313         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1314                 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1315         }
1316
1317         if ( op_type == META_OP_REQUIRE_SINGLE ) {
1318                 metatarget_t            *mt = NULL;
1319                 metasingleconn_t        *msc = NULL;
1320
1321                 int                     j;
1322
1323                 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1324                         META_CANDIDATE_RESET( &candidates[ j ] );
1325                 }
1326
1327                 /*
1328                  * tries to get a unique candidate
1329                  * (takes care of default target)
1330                  */
1331                 if ( i == META_TARGET_NONE ) {
1332                         i = meta_back_get_candidate( op, rs, &ndn );
1333
1334                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1335                                 i = meta_back_get_candidate( op, rs, &pndn );
1336                         }
1337
1338                         if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1339                                 if ( mc != NULL ) {
1340                                         meta_back_release_conn( mi, mc );
1341                                 }
1342
1343                                 if ( sendok & LDAP_BACK_SENDERR ) {
1344                                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1345                                                 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1346                                         }
1347                                         send_ldap_result( op, rs );
1348                                         rs->sr_matched = NULL;
1349                                 }
1350
1351                                 return NULL;
1352                         }
1353                 }
1354
1355                 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1356                 {
1357                         if ( mc != NULL ) {
1358                                 meta_back_release_conn( mi, mc );
1359                         }
1360
1361                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1362                         rs->sr_text = "Cross-target rename not supported";
1363                         if ( sendok & LDAP_BACK_SENDERR ) {
1364                                 send_ldap_result( op, rs );
1365                         }
1366
1367                         return NULL;
1368                 }
1369
1370                 Debug( LDAP_DEBUG_TRACE,
1371         "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1372                                 i, op->o_req_ndn.bv_val, 0 );
1373
1374                 if ( mc == NULL ) {
1375                         /* Retries searching for a metaconn in the avl tree
1376                          * the reason is that the connection might have been
1377                          * created by meta_back_get_candidate() */
1378                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
1379 retry_lock2:;
1380                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1381                                 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1382                                         (caddr_t)&mc_curr, meta_back_conndn_cmp );
1383                                 if ( mc != NULL ) {
1384                                         /* catch taint errors */
1385                                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1386
1387                                         /* Don't reuse connections while they're still binding */
1388                                         if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] )
1389                                                 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) )
1390                                         {
1391                                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1392                                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1393                                                         ldap_pvt_thread_yield();
1394                                                         goto retry_lock2;
1395                                                 }
1396
1397                                                 mc = NULL;
1398
1399                                         } else {
1400                                                 mc->mc_refcnt++;
1401                                         }
1402                                 }
1403                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1404                         }
1405
1406                         /* Looks like we didn't get a bind. Open a new session... */
1407                         if ( mc == NULL ) {
1408                                 assert( new_conn == 0 );
1409                                 mc = metaconn_alloc( op );
1410                                 mc->mc_conn = mc_curr.mc_conn;
1411                                 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1412                                 new_conn = 1;
1413                                 if ( sendok & LDAP_BACK_BINDING ) {
1414                                         LDAP_BACK_CONN_BINDING_SET( mc );
1415                                 }
1416                                 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1417                                         LDAP_BACK_CONN_ISPRIV_SET( mc );
1418
1419                                 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1420                                         LDAP_BACK_CONN_ISANON_SET( mc );
1421                                 }
1422                         }
1423                 }
1424
1425                 /*
1426                  * Clear all other candidates
1427                  */
1428                 ( void )meta_clear_unused_candidates( op, i );
1429
1430                 mt = mi->mi_targets[ i ];
1431                 msc = &mc->mc_conns[ i ];
1432
1433                 /*
1434                  * The target is activated; if needed, it is
1435                  * also init'd. In case of error, meta_back_init_one_conn
1436                  * sends the appropriate result.
1437                  */
1438                 err = meta_back_init_one_conn( op, rs, mc, i,
1439                         LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn );
1440                 if ( err != LDAP_SUCCESS ) {
1441                         /*
1442                          * FIXME: in case one target cannot
1443                          * be init'd, should the other ones
1444                          * be tried?
1445                          */
1446                         META_CANDIDATE_RESET( &candidates[ i ] );
1447                         if ( new_conn ) {
1448                                 mc->mc_refcnt = 0;
1449                                 meta_back_conn_free( mc );
1450
1451                         } else {
1452                                 meta_back_release_conn( mi, mc );
1453                         }
1454                         return NULL;
1455                 }
1456
1457                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1458                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1459                 }
1460
1461                 candidates[ i ].sr_err = LDAP_SUCCESS;
1462                 META_CANDIDATE_SET( &candidates[ i ] );
1463                 ncandidates++;
1464
1465                 if ( candidate ) {
1466                         *candidate = i;
1467                 }
1468
1469         /*
1470          * if no unique candidate ...
1471          */
1472         } else {
1473
1474                 /* Looks like we didn't get a bind. Open a new session... */
1475                 if ( mc == NULL ) {
1476                         assert( new_conn == 0 );
1477                         mc = metaconn_alloc( op );
1478                         mc->mc_conn = mc_curr.mc_conn;
1479                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1480                         new_conn = 1;
1481                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1482                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1483
1484                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1485                                 LDAP_BACK_CONN_ISANON_SET( mc );
1486                         }
1487                 }
1488
1489                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1490                         metatarget_t            *mt = mi->mi_targets[ i ];
1491
1492                         META_CANDIDATE_RESET( &candidates[ i ] );
1493
1494                         if ( i == cached
1495                                 || meta_back_is_candidate( mt, &op->o_req_ndn,
1496                                         LDAP_SCOPE_SUBTREE ) )
1497                         {
1498
1499                                 /*
1500                                  * The target is activated; if needed, it is
1501                                  * also init'd
1502                                  */
1503                                 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1504                                         LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1505                                         LDAP_BACK_DONTSEND, !new_conn );
1506                                 candidates[ i ].sr_err = lerr;
1507                                 if ( lerr == LDAP_SUCCESS ) {
1508                                         META_CANDIDATE_SET( &candidates[ i ] );
1509                                         ncandidates++;
1510
1511                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1512                                                 op->o_log_prefix, i, 0 );
1513
1514                                 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1515                                         META_CANDIDATE_SET( &candidates[ i ] );
1516
1517                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1518                                                 op->o_log_prefix, i,
1519                                                 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1520
1521                                 } else {
1522
1523                                         /*
1524                                          * FIXME: in case one target cannot
1525                                          * be init'd, should the other ones
1526                                          * be tried?
1527                                          */
1528                                         if ( new_conn ) {
1529                                                 ( void )meta_clear_one_candidate( op, mc, i );
1530                                         }
1531                                         /* leave the target candidate, but record the error for later use */
1532                                         err = lerr;
1533
1534                                         if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1535                                                 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined err=%d\n",
1536                                                         op->o_log_prefix, i, lerr );
1537
1538                                         } else {
1539                                                 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed err=%d\n",
1540                                                         op->o_log_prefix, i, lerr );
1541                                         }
1542
1543                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1544                                                 if ( sendok & LDAP_BACK_SENDERR ) {
1545                                                         send_ldap_result( op, rs );
1546                                                 }
1547                                                 if ( new_conn ) {
1548                                                         mc->mc_refcnt = 0;
1549                                                         meta_back_conn_free( mc );
1550
1551                                                 } else {
1552                                                         meta_back_release_conn( mi, mc );
1553                                                 }
1554
1555                                                 return NULL;
1556                                         }
1557
1558                                         continue;
1559                                 }
1560
1561                         } else {
1562                                 if ( new_conn ) {
1563                                         ( void )meta_clear_one_candidate( op, mc, i );
1564                                 }
1565                         }
1566                 }
1567
1568                 if ( ncandidates == 0 ) {
1569                         if ( new_conn ) {
1570                                 mc->mc_refcnt = 0;
1571                                 meta_back_conn_free( mc );
1572
1573                         } else {
1574                                 meta_back_release_conn( mi, mc );
1575                         }
1576
1577                         if ( rs->sr_err == LDAP_SUCCESS ) {
1578                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1579                                 rs->sr_text = "Unable to select valid candidates";
1580                         }
1581
1582                         if ( sendok & LDAP_BACK_SENDERR ) {
1583                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1584                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1585                                 }
1586                                 send_ldap_result( op, rs );
1587                                 rs->sr_matched = NULL;
1588                         }
1589
1590                         return NULL;
1591                 }
1592         }
1593
1594 done:;
1595         /* clear out meta_back_init_one_conn non-fatal errors */
1596         rs->sr_err = LDAP_SUCCESS;
1597         rs->sr_text = NULL;
1598
1599         /* touch the timestamp */
1600         if ( mi->mi_idle_timeout != 0 ) {
1601                 mc->mc_time = op->o_time;
1602         }
1603
1604         if ( new_conn ) {
1605                 if ( mi->mi_conn_ttl ) {
1606                         mc->mc_create_time = op->o_time;
1607                 }
1608
1609                 /*
1610                  * Inserts the newly created metaconn in the avl tree
1611                  */
1612                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1613 #if META_BACK_PRINT_CONNTREE > 0
1614                 meta_back_print_conntree( mi, ">>> meta_back_getconn" );
1615 #endif /* META_BACK_PRINT_CONNTREE */
1616
1617                 err = 0;
1618                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1619                         if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) {
1620                                 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1621                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++;
1622                                 LDAP_BACK_CONN_CACHED_SET( mc );
1623
1624                         } else {
1625                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1626                         }
1627                         rs->sr_err = 0;
1628
1629                 } else if ( !( sendok & LDAP_BACK_BINDING ) ) {
1630                         err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1631                                 meta_back_conndn_cmp, meta_back_conndn_dup );
1632                         LDAP_BACK_CONN_CACHED_SET( mc );
1633                 }
1634
1635 #if META_BACK_PRINT_CONNTREE > 0
1636                 meta_back_print_conntree( mi, "<<< meta_back_getconn" );
1637 #endif /* META_BACK_PRINT_CONNTREE */
1638                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1639
1640                 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1641                         /*
1642                          * Err could be -1 in case a duplicate metaconn is inserted
1643                          */
1644                         switch ( err ) {
1645                         case 0:
1646                                 break;
1647
1648                         case -1:
1649                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1650                                 /* duplicate: free and try to get the newly created one */
1651                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1652                                         mc->mc_refcnt = 0;
1653                                         meta_back_conn_free( mc );
1654
1655                                         new_conn = 0;
1656                                         goto retry_lock;
1657                                 }
1658
1659                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1660                                 break;
1661
1662                         default:
1663                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1664                                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
1665                                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1666                                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1667
1668                                         Debug( LDAP_DEBUG_ANY,
1669                                                 "%s meta_back_getconn: candidates=%d conn=%s insert failed\n",
1670                                                 op->o_log_prefix, ncandidates, buf );
1671                                 }
1672
1673                                 mc->mc_refcnt = 0;
1674                                 meta_back_conn_free( mc );
1675
1676                                 rs->sr_err = LDAP_OTHER;
1677                                 rs->sr_text = "Proxy bind collision";
1678                                 if ( sendok & LDAP_BACK_SENDERR ) {
1679                                         send_ldap_result( op, rs );
1680                                 }
1681                                 return NULL;
1682                         }
1683                 }
1684
1685                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1686                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1687                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1688
1689                         Debug( LDAP_DEBUG_TRACE,
1690                                 "%s meta_back_getconn: candidates=%d conn=%s inserted\n",
1691                                 op->o_log_prefix, ncandidates, buf );
1692                 }
1693
1694         } else {
1695                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1696                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1697                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1698
1699                         Debug( LDAP_DEBUG_TRACE,
1700                                 "%s meta_back_getconn: candidates=%d conn=%s fetched\n",
1701                                 op->o_log_prefix, ncandidates, buf );
1702                 }
1703         }
1704
1705         return mc;
1706 }
1707
1708 void
1709 meta_back_release_conn_lock(
1710         metainfo_t              *mi,
1711         metaconn_t              *mc,
1712         int                     dolock )
1713 {
1714         assert( mc != NULL );
1715
1716         if ( dolock ) {
1717                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1718         }
1719         assert( mc->mc_refcnt > 0 );
1720         mc->mc_refcnt--;
1721         /* NOTE: the connection is removed if either it is tainted
1722          * or if it is shared and no one else is using it.  This needs
1723          * to occur because for intrinsic reasons cached connections
1724          * that are not privileged would live forever and pollute
1725          * the connection space (and eat up resources).  Maybe this
1726          * should be configurable... */
1727         if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) {
1728 #if META_BACK_PRINT_CONNTREE > 0
1729                 meta_back_print_conntree( mi, ">>> meta_back_release_conn" );
1730 #endif /* META_BACK_PRINT_CONNTREE */
1731
1732                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1733                         if ( mc->mc_q.tqe_prev != NULL ) {
1734                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
1735                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1736                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1737                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1738                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1739
1740                         } else {
1741                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1742                         }
1743
1744                 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) {
1745                         metaconn_t      *tmpmc;
1746
1747                         tmpmc = avl_delete( &mi->mi_conninfo.lai_tree,
1748                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
1749
1750                         /* Overparanoid, but useful... */
1751                         assert( tmpmc == NULL || tmpmc == mc );
1752                 }
1753
1754                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1755
1756 #if META_BACK_PRINT_CONNTREE > 0
1757                 meta_back_print_conntree( mi, "<<< meta_back_release_conn" );
1758 #endif /* META_BACK_PRINT_CONNTREE */
1759
1760                 if ( mc->mc_refcnt == 0 ) {
1761                         meta_back_conn_free( mc );
1762                         mc = NULL;
1763                 }
1764         }
1765
1766         if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) {
1767                 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1768         }
1769
1770         if ( dolock ) {
1771                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1772         }
1773 }
1774
1775 void
1776 meta_back_quarantine(
1777         Operation       *op,
1778         SlapReply       *rs,
1779         int             candidate )
1780 {
1781         metainfo_t              *mi = (metainfo_t *)op->o_bd->be_private;
1782         metatarget_t            *mt = mi->mi_targets[ candidate ];
1783
1784         slap_retry_info_t       *ri = &mt->mt_quarantine;
1785
1786         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1787
1788         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1789                 time_t  new_last = slap_get_time();
1790
1791                 switch ( mt->mt_isquarantined ) {
1792                 case LDAP_BACK_FQ_NO:
1793                         if ( ri->ri_last == new_last ) {
1794                                 goto done;
1795                         }
1796
1797                         Debug( LDAP_DEBUG_ANY,
1798                                 "%s meta_back_quarantine[%d]: enter.\n",
1799                                 op->o_log_prefix, candidate, 0 );
1800
1801                         ri->ri_idx = 0;
1802                         ri->ri_count = 0;
1803                         break;
1804
1805                 case LDAP_BACK_FQ_RETRYING:
1806                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
1807                                 char    buf[ SLAP_TEXT_BUFLEN ];
1808
1809                                 snprintf( buf, sizeof( buf ),
1810                                         "meta_back_quarantine[%d]: block #%d try #%d failed",
1811                                         candidate, ri->ri_idx, ri->ri_count );
1812                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1813                                         op->o_log_prefix, buf, 0 );
1814                         }
1815
1816                         ++ri->ri_count;
1817                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1818                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1819                         {
1820                                 ri->ri_count = 0;
1821                                 ++ri->ri_idx;
1822                         }
1823                         break;
1824
1825                 default:
1826                         break;
1827                 }
1828
1829                 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1830                 ri->ri_last = new_last;
1831
1832         } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1833                 Debug( LDAP_DEBUG_ANY,
1834                         "%s meta_back_quarantine[%d]: exit.\n",
1835                         op->o_log_prefix, candidate, 0 );
1836
1837                 if ( mi->mi_quarantine_f ) {
1838                         (void)mi->mi_quarantine_f( mi, candidate,
1839                                 mi->mi_quarantine_p );
1840                 }
1841
1842                 ri->ri_count = 0;
1843                 ri->ri_idx = 0;
1844                 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1845         }
1846
1847 done:;
1848         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
1849 }
1850