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