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 1999-2009 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
 489                                         /* FIXME: in case a referral
 490                                          * is returned, should we try
 491                                          * using it instead of the
 492                                          * configured URI? */
 493                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 494                                                 ldap_install_tls( msc->msc_ld );
 495
 496                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 497                                                 /* FIXME: LDAP_OPERATIONS_ERROR? */
 498                                                 rs->sr_err = LDAP_OTHER;
 499                                                 rs->sr_text = "Unwilling to chase referral "
 500                                                         "returned by Start TLS exop";
 501                                         }
 502
 503                                         if ( data ) {
 504                                                 ber_bvfree( data );
 505                                         }
 506                                 }
 507
 508                         } else {
 509                                 rs->sr_err = LDAP_OTHER;
 510                         }
 511
 512                         if ( res != NULL ) {
 513                                 ldap_msgfree( res );
 514                         }
 515                 }
 516 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 517                 /*
 518                  * use synchronous StartTLS
 519                  */
 520                 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
 521 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 522
 523                 /* if StartTLS is requested, only attempt it if the URL
 524                  * is not "ldaps://"; this may occur not only in case
 525                  * of misconfiguration, but also when used in the chain
 526                  * overlay, where the "uri" can be parsed out of a referral */
 527                 if ( rs->sr_err == LDAP_SERVER_DOWN
 528                         || ( rs->sr_err != LDAP_SUCCESS
 529                                 && META_BACK_TGT_TLS_CRITICAL( mt ) ) )
 530                 {
 531
 532 #ifdef DEBUG_205
 533                         Debug( LDAP_DEBUG_ANY,
 534                                 "### %s meta_back_init_one_conn(TLS) "
 535                                 "ldap_unbind_ext[%d] ld=%p\n",
 536                                 op->o_log_prefix, candidate,
 537                                 (void *)msc->msc_ld );
 538 #endif /* DEBUG_205 */
 539
 540                         /* need to trash a failed Start TLS */
 541                         meta_clear_one_candidate( op, mc, candidate );
 542                         goto error_return;
 543                 }
 544         }
 545 #endif /* HAVE_TLS */
 546
 547         /*
 548          * Set the network timeout if set
 549          */
 550         if ( mt->mt_network_timeout != 0 ) {
 551                 struct timeval  network_timeout;
 552
 553                 network_timeout.tv_usec = 0;
 554                 network_timeout.tv_sec = mt->mt_network_timeout;
 555
 556                 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
 557                                 (void *)&network_timeout );
 558         }
 559
 560         /*
 561          * If the connection DN is not null, an attempt to rewrite it is made
 562          */
 563
 564         if ( ispriv ) {
 565                 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
 566                         ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
 567                         if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
 568                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 569                                         memset( msc->msc_cred.bv_val, 0,
 570                                                 msc->msc_cred.bv_len );
 571                                 }
 572                                 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
 573                         }
 574
 575                 } else {
 576                         ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
 577                 }
 578
 579         } else {
 580                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 581                         memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 582                         ber_memfree_x( msc->msc_cred.bv_val, NULL );
 583                         BER_BVZERO( &msc->msc_cred );
 584                 }
 585                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 586                         ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
 587                         BER_BVZERO( &msc->msc_bound_ndn );
 588                 }
 589                 if ( !BER_BVISEMPTY( &op->o_ndn )
 590                         && SLAP_IS_AUTHZ_BACKEND( op )
 591                         && isauthz )
 592                 {
 593                         dc.target = mt;
 594                         dc.conn = op->o_conn;
 595                         dc.rs = rs;
 596                         dc.ctx = "bindDN";
 597
 598                         /*
 599                          * Rewrite the bind dn if needed
 600                          */
 601                         if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
 602                                                 &msc->msc_bound_ndn ) )
 603                         {
 604
 605 #ifdef DEBUG_205
 606                                 Debug( LDAP_DEBUG_ANY,
 607                                         "### %s meta_back_init_one_conn(rewrite) "
 608                                         "ldap_unbind_ext[%d] ld=%p\n",
 609                                         op->o_log_prefix, candidate,
 610                                         (void *)msc->msc_ld );
 611 #endif /* DEBUG_205 */
 612
 613                                 /* need to trash a connection not fully established */
 614                                 meta_clear_one_candidate( op, mc, candidate );
 615                                 goto error_return;
 616                         }
 617
 618                         /* copy the DN if needed */
 619                         if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
 620                                 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
 621                         }
 622
 623                         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 624
 625                 } else {
 626                         ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
 627                 }
 628         }
 629
 630         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 631
 632 error_return:;
 633         if ( dolock ) {
 634                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 635         }
 636         META_BACK_CONN_CREATING_CLEAR( msc );
 637         if ( rs->sr_err == LDAP_SUCCESS ) {
 638                 /*
 639                  * Sets a cookie for the rewrite session
 640                  */
 641                 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
 642                 META_BACK_CONN_INITED_SET( msc );
 643         }
 644         if ( dolock ) {
 645                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 646         }
 647
 648         if ( rs->sr_err != LDAP_SUCCESS ) {
 649                 rs->sr_err = slap_map_api2result( rs );
 650                 if ( sendok & LDAP_BACK_SENDERR ) {
 651                         send_ldap_result( op, rs );
 652                 }
 653         }
 654
 655         return rs->sr_err;
 656 }
 657
 658 /*
 659  * meta_back_retry
 660  *
 661  * Retries one connection
 662  */
 663 int
 664 meta_back_retry(
 665         Operation               *op,
 666         SlapReply               *rs,
 667         metaconn_t              **mcp,
 668         int                     candidate,
 669         ldap_back_send_t        sendok )
 670 {
 671         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 672         metatarget_t            *mt = mi->mi_targets[ candidate ];
 673         metaconn_t              *mc = *mcp;
 674         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 675         int                     rc = LDAP_UNAVAILABLE,
 676                                 binding,
 677                                 quarantine = 1;
 678
 679         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 680
 681         assert( !META_BACK_CONN_CREATING( msc ) );
 682         binding = LDAP_BACK_CONN_BINDING( msc );
 683         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 684
 685         assert( mc->mc_refcnt > 0 );
 686         if ( mc->mc_refcnt == 1 ) {
 687                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
 688                         char    buf[ SLAP_TEXT_BUFLEN ];
 689
 690                         /* this lock is required; however,
 691                          * it's invoked only when logging is on */
 692                         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 693                         snprintf( buf, sizeof( buf ),
 694                                 "retrying URI=\"%s\" DN=\"%s\"",
 695                                 mt->mt_uri,
 696                                 BER_BVISNULL( &msc->msc_bound_ndn ) ?
 697                                         "" : msc->msc_bound_ndn.bv_val );
 698                         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 699
 700                         Debug( LDAP_DEBUG_ANY,
 701                                 "%s meta_back_retry[%d]: %s.\n",
 702                                 op->o_log_prefix, candidate, buf );
 703                 }
 704
 705                 meta_clear_one_candidate( op, mc, candidate );
 706                 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 707
 708                 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 709
 710                 /* mc here must be the regular mc, reset and ready for init */
 711                 rc = meta_back_init_one_conn( op, rs, mc, candidate,
 712                         LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 );
 713
 714                 /* restore the "binding" flag, in case */
 715                 if ( binding ) {
 716                         LDAP_BACK_CONN_BINDING_SET( msc );
 717                 }
 718
 719                 if ( rc == LDAP_SUCCESS ) {
 720                         quarantine = 0;
 721                         rc = meta_back_single_dobind( op, rs, mcp, candidate,
 722                                 sendok, mt->mt_nretries, 0 );
 723
 724                         Debug( LDAP_DEBUG_ANY,
 725                                 "%s meta_back_retry[%d]: "
 726                                 "meta_back_single_dobind=%d\n",
 727                                 op->o_log_prefix, candidate, rc );
 728                         if ( rc == LDAP_SUCCESS ) {
 729                                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
 730                                         !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 731                                 {
 732                                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 733
 734                                 } else {
 735                                         LDAP_BACK_CONN_ISANON_SET( msc );
 736                                 }
 737
 738                                 /* when bound, dispose of the "binding" flag */
 739                                 if ( binding ) {
 740                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 741                                 }
 742                         }
 743                 }
 744
 745                 /* don't send twice */
 746                 sendok &= ~LDAP_BACK_SENDERR;
 747         }
 748
 749         if ( rc != LDAP_SUCCESS ) {
 750                 SlapReply               *candidates = meta_back_candidates_get( op );
 751
 752                 candidates[ candidate ].sr_err = rc;
 753
 754                 if ( *mcp != NULL ) {
 755                         if ( mc->mc_refcnt == 1 ) {
 756                                 if ( binding ) {
 757                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 758                                 }
 759                                 (void)meta_clear_one_candidate( op, mc, candidate );
 760                         }
 761
 762                         LDAP_BACK_CONN_TAINTED_SET( mc );
 763                         /* only release if mandatory; otherwise
 764                          * let the caller do what's best before
 765                          * releasing */
 766                         if ( META_BACK_ONERR_STOP( mi ) ) {
 767                                 meta_back_release_conn_lock( mi, mc, 0 );
 768                                 *mcp = NULL;
 769
 770                         } else {
 771 #if META_BACK_PRINT_CONNTREE > 0
 772                                 meta_back_print_conntree( mi, ">>> meta_back_retry" );
 773 #endif /* META_BACK_PRINT_CONNTREE */
 774
 775                                 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */
 776                                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
 777                                         if ( mc->mc_q.tqe_prev != NULL ) {
 778                                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
 779                                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
 780                                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
 781                                                         mc, mc_q );
 782                                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
 783                                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
 784
 785                                         } else {
 786                                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
 787                                         }
 788
 789                                 } else {
 790                                         /* FIXME: check if in tree, for consistency? */
 791                                         (void)avl_delete( &mi->mi_conninfo.lai_tree,
 792                                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
 793                                 }
 794                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
 795
 796 #if META_BACK_PRINT_CONNTREE > 0
 797                                 meta_back_print_conntree( mi, "<<< meta_back_retry" );
 798 #endif /* META_BACK_PRINT_CONNTREE */
 799                         }
 800                 }
 801
 802                 if ( sendok & LDAP_BACK_SENDERR ) {
 803                         rs->sr_err = rc;
 804                         rs->sr_text = "Unable to retry";
 805                         send_ldap_result( op, rs );
 806                 }
 807         }
 808
 809         if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) {
 810                 meta_back_quarantine( op, rs, candidate );
 811         }
 812
 813         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 814
 815         return rc == LDAP_SUCCESS ? 1 : 0;
 816 }
 817
 818 /*
 819  * callback for unique candidate selection
 820  */
 821 static int
 822 meta_back_conn_cb( Operation *op, SlapReply *rs )
 823 {
 824         assert( op->o_tag == LDAP_REQ_SEARCH );
 825
 826         switch ( rs->sr_type ) {
 827         case REP_SEARCH:
 828                 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
 829                 break;
 830
 831         case REP_SEARCHREF:
 832         case REP_RESULT:
 833                 break;
 834
 835         default:
 836                 return rs->sr_err;
 837         }
 838
 839         return 0;
 840 }
 841
 842
 843 static int
 844 meta_back_get_candidate(
 845         Operation       *op,
 846         SlapReply       *rs,
 847         struct berval   *ndn )
 848 {
 849         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 850         long            candidate;
 851
 852         /*
 853          * tries to get a unique candidate
 854          * (takes care of default target)
 855          */
 856         candidate = meta_back_select_unique_candidate( mi, ndn );
 857
 858         /*
 859          * if any is found, inits the connection
 860          */
 861         if ( candidate == META_TARGET_NONE ) {
 862                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 863                 rs->sr_text = "No suitable candidate target found";
 864
 865         } else if ( candidate == META_TARGET_MULTIPLE ) {
 866                 Operation       op2 = *op;
 867                 SlapReply       rs2 = { 0 };
 868                 slap_callback   cb2 = { 0 };
 869                 int             rc;
 870
 871                 /* try to get a unique match for the request ndn
 872                  * among the multiple candidates available */
 873                 op2.o_tag = LDAP_REQ_SEARCH;
 874                 op2.o_req_dn = *ndn;
 875                 op2.o_req_ndn = *ndn;
 876                 op2.ors_scope = LDAP_SCOPE_BASE;
 877                 op2.ors_deref = LDAP_DEREF_NEVER;
 878                 op2.ors_attrs = slap_anlist_no_attrs;
 879                 op2.ors_attrsonly = 0;
 880                 op2.ors_limit = NULL;
 881                 op2.ors_slimit = 1;
 882                 op2.ors_tlimit = SLAP_NO_LIMIT;
 883
 884                 op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
 885                 op2.ors_filterstr = *slap_filterstr_objectClass_pres;
 886
 887                 op2.o_callback = &cb2;
 888                 cb2.sc_response = meta_back_conn_cb;
 889                 cb2.sc_private = (void *)&candidate;
 890
 891                 rc = op->o_bd->be_search( &op2, &rs2 );
 892
 893                 switch ( rs2.sr_err ) {
 894                 case LDAP_SUCCESS:
 895                 default:
 896                         rs->sr_err = rs2.sr_err;
 897                         break;
 898
 899                 case LDAP_SIZELIMIT_EXCEEDED:
 900                         /* if multiple candidates can serve the operation,
 901                          * and a default target is defined, and it is
 902                          * a candidate, try using it (FIXME: YMMV) */
 903                         if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
 904                                 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
 905                                                 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
 906                         {
 907                                 candidate = mi->mi_defaulttarget;
 908                                 rs->sr_err = LDAP_SUCCESS;
 909                                 rs->sr_text = NULL;
 910
 911                         } else {
 912                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 913                                 rs->sr_text = "Unable to select unique candidate target";
 914                         }
 915                         break;
 916                 }
 917
 918         } else {
 919                 rs->sr_err = LDAP_SUCCESS;
 920         }
 921
 922         return candidate;
 923 }
 924
 925 static void     *meta_back_candidates_dummy;
 926
 927 static void
 928 meta_back_candidates_keyfree(
 929         void            *key,
 930         void            *data )
 931 {
 932         metacandidates_t        *mc = (metacandidates_t *)data;
 933
 934         ber_memfree_x( mc->mc_candidates, NULL );
 935         ber_memfree_x( data, NULL );
 936 }
 937
 938 SlapReply *
 939 meta_back_candidates_get( Operation *op )
 940 {
 941         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 942         metacandidates_t        *mc;
 943
 944         if ( op->o_threadctx ) {
 945                 void            *data = NULL;
 946
 947                 ldap_pvt_thread_pool_getkey( op->o_threadctx,
 948                                 &meta_back_candidates_dummy, &data, NULL );
 949                 mc = (metacandidates_t *)data;
 950
 951         } else {
 952                 mc = mi->mi_candidates;
 953         }
 954
 955         if ( mc == NULL ) {
 956                 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
 957                 mc->mc_ntargets = mi->mi_ntargets;
 958                 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
 959                 if ( op->o_threadctx ) {
 960                         void            *data = NULL;
 961
 962                         data = (void *)mc;
 963                         ldap_pvt_thread_pool_setkey( op->o_threadctx,
 964                                         &meta_back_candidates_dummy, data,
 965                                         meta_back_candidates_keyfree,
 966                                         NULL, NULL );
 967
 968                 } else {
 969                         mi->mi_candidates = mc;
 970                 }
 971
 972         } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
 973                 /* NOTE: in the future, may want to allow back-config
 974                  * to add/remove targets from back-meta... */
 975                 mc->mc_candidates = ch_realloc( mc->mc_candidates,
 976                                 sizeof( SlapReply ) * mi->mi_ntargets );
 977                 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
 978                         sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
 979                 mc->mc_ntargets = mi->mi_ntargets;
 980         }
 981
 982         return mc->mc_candidates;
 983 }
 984
 985 /*
 986  * meta_back_getconn
 987  *
 988  * Prepares the connection structure
 989  *
 990  * RATIONALE:
 991  *
 992  * - determine what DN is being requested:
 993  *
 994  *      op      requires candidate      checks
 995  *
 996  *      add     unique                  parent of o_req_ndn
 997  *      bind    unique^*[/all]          o_req_ndn [no check]
 998  *      compare unique^+                o_req_ndn
 999  *      delete  unique                  o_req_ndn
1000  *      modify  unique                  o_req_ndn
1001  *      search  any                     o_req_ndn
1002  *      modrdn  unique[, unique]        o_req_ndn[, orr_nnewSup]
1003  *
1004  * - for ops that require the candidate to be unique, in case of multiple
1005  *   occurrences an internal search with sizeLimit=1 is performed
1006  *   if a unique candidate can actually be determined.  If none is found,
1007  *   the operation aborts; if multiple are found, the default target
1008  *   is used if defined and candidate; otherwise the operation aborts.
1009  *
1010  * *^note: actually, the bind operation is handled much like a search;
1011  *   i.e. the bind is broadcast to all candidate targets.
1012  *
1013  * +^note: actually, the compare operation is handled much like a search;
1014  *   i.e. the compare is broadcast to all candidate targets, while checking
1015  *   that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
1016  *   returned.
1017  */
1018 metaconn_t *
1019 meta_back_getconn(
1020         Operation               *op,
1021         SlapReply               *rs,
1022         int                     *candidate,
1023         ldap_back_send_t        sendok )
1024 {
1025         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
1026         metaconn_t      *mc = NULL,
1027                         mc_curr = { 0 };
1028         int             cached = META_TARGET_NONE,
1029                         i = META_TARGET_NONE,
1030                         err = LDAP_SUCCESS,
1031                         new_conn = 0,
1032                         ncandidates = 0;
1033
1034
1035         meta_op_type    op_type = META_OP_REQUIRE_SINGLE;
1036         enum            {
1037                 META_DNTYPE_ENTRY,
1038                 META_DNTYPE_PARENT,
1039                 META_DNTYPE_NEWPARENT
1040         }               dn_type = META_DNTYPE_ENTRY;
1041         struct berval   ndn = op->o_req_ndn,
1042                         pndn;
1043
1044         SlapReply       *candidates = meta_back_candidates_get( op );
1045
1046         /* Internal searches are privileged and shared. So is root. */
1047         if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) )
1048                 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) )
1049                 || op->o_do_not_cache || be_isroot( op ) )
1050         {
1051                 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
1052                 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
1053                 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op );
1054
1055         } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) )
1056         {
1057                 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1058                 BER_BVSTR( &mc_curr.mc_local_ndn, "" );
1059                 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1060
1061         } else {
1062                 mc_curr.mc_local_ndn = op->o_ndn;
1063
1064                 /* Explicit binds must not be shared */
1065                 if ( !BER_BVISEMPTY( &op->o_ndn )
1066                         || op->o_tag == LDAP_REQ_BIND
1067                         || SLAP_IS_AUTHZ_BACKEND( op ) )
1068                 {
1069                         mc_curr.mc_conn = op->o_conn;
1070
1071                 } else {
1072                         LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1073                         LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1074                 }
1075         }
1076
1077         /* Explicit Bind requests always get their own conn */
1078         if ( sendok & LDAP_BACK_BINDING ) {
1079                 mc_curr.mc_conn = op->o_conn;
1080
1081         } else {
1082                 /* Searches for a metaconn in the avl tree */
1083 retry_lock:;
1084                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1085                 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) {
1086                         /* lookup a conn that's not binding */
1087                         LDAP_TAILQ_FOREACH( mc,
1088                                 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv,
1089                                 mc_q )
1090                         {
1091                                 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) {
1092                                         break;
1093                                 }
1094                         }
1095
1096                         if ( mc != NULL ) {
1097                                 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1098                                         metaconn_t, mc_q ) )
1099                                 {
1100                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1101                                                 mc, mc_q );
1102                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1103                                         LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1104                                                 mc, mc_q );
1105                                 }
1106
1107                         } else if ( !LDAP_BACK_USE_TEMPORARIES( mi )
1108                                 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max )
1109                         {
1110                                 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv );
1111                         }
1112
1113
1114                 } else {
1115                         mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1116                                 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1117                 }
1118
1119                 if ( mc ) {
1120                         /* catch taint errors */
1121                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1122
1123                         /* Don't reuse connections while they're still binding
1124                          * NOTE: only makes sense for binds */
1125                         if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1126                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1127                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1128
1129                                         ldap_pvt_thread_yield();
1130                                         goto retry_lock;
1131                                 }
1132
1133                                 /* release conn, and create a temporary */
1134                                 mc = NULL;
1135
1136                         } else {
1137                                 if ( ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1138                                         || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
1139                                 {
1140 #if META_BACK_PRINT_CONNTREE > 0
1141                                         meta_back_print_conntree( mi,
1142                                                 ">>> meta_back_getconn(expired)" );
1143 #endif /* META_BACK_PRINT_CONNTREE */
1144
1145                                         /* don't let anyone else use this expired connection */
1146                                         if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1147                                                 if ( mc->mc_q.tqe_prev != NULL ) {
1148                                                         assert( LDAP_BACK_CONN_CACHED( mc ) );
1149                                                         assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1150                                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1151                                                                 mc, mc_q );
1152                                                         mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1153                                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1154
1155                                                 } else {
1156                                                         assert( !LDAP_BACK_CONN_CACHED( mc ) );
1157                                                 }
1158
1159                                         } else {
1160                                                 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1161                                                         (caddr_t)mc, meta_back_conndnmc_cmp );
1162                                         }
1163
1164 #if META_BACK_PRINT_CONNTREE > 0
1165                                         meta_back_print_conntree( mi,
1166                                                 "<<< meta_back_getconn(expired)" );
1167 #endif /* META_BACK_PRINT_CONNTREE */
1168                                         LDAP_BACK_CONN_TAINTED_SET( mc );
1169                                         LDAP_BACK_CONN_CACHED_CLEAR( mc );
1170
1171                                         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1172                                                 char buf[STRLENOF("4294967295U") + 1] = { 0 };
1173                                                 ldap_back_conn2str( (ldapconn_t *)mc, buf, sizeof(buf) );
1174
1175                                                 Debug( LDAP_DEBUG_TRACE,
1176                                                         "%s meta_back_getconn: mc=%p conn=%s expired (tainted).\n",
1177                                                         op->o_log_prefix, (void *)mc, buf );
1178                                         }
1179                                 }
1180
1181                                 mc->mc_refcnt++;
1182                         }
1183                 }
1184                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1185         }
1186
1187         switch ( op->o_tag ) {
1188         case LDAP_REQ_ADD:
1189                 /* if we go to selection, the entry must not exist,
1190                  * and we must be able to resolve the parent */
1191                 dn_type = META_DNTYPE_PARENT;
1192                 dnParent( &ndn, &pndn );
1193                 break;
1194
1195         case LDAP_REQ_MODRDN:
1196                 /* if nnewSuperior is not NULL, it must resolve
1197                  * to the same candidate as the req_ndn */
1198                 if ( op->orr_nnewSup ) {
1199                         dn_type = META_DNTYPE_NEWPARENT;
1200                 }
1201                 break;
1202
1203         case LDAP_REQ_BIND:
1204                 /* if bound as rootdn, the backend must bind to all targets
1205                  * with the administrative identity
1206                  * (unless pseoudoroot-bind-defer is TRUE) */
1207                 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
1208                         op_type = META_OP_REQUIRE_ALL;
1209                 }
1210                 break;
1211
1212         case LDAP_REQ_COMPARE:
1213         case LDAP_REQ_DELETE:
1214         case LDAP_REQ_MODIFY:
1215                 /* just a unique candidate */
1216                 break;
1217
1218         case LDAP_REQ_SEARCH:
1219                 /* allow multiple candidates for the searchBase */
1220                 op_type = META_OP_ALLOW_MULTIPLE;
1221                 break;
1222
1223         default:
1224                 /* right now, just break (exop?) */
1225                 break;
1226         }
1227
1228         /*
1229          * require all connections ...
1230          */
1231         if ( op_type == META_OP_REQUIRE_ALL ) {
1232
1233                 /* Looks like we didn't get a bind. Open a new session... */
1234                 if ( mc == NULL ) {
1235                         assert( new_conn == 0 );
1236                         mc = metaconn_alloc( op );
1237                         mc->mc_conn = mc_curr.mc_conn;
1238                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1239                         new_conn = 1;
1240                         if ( sendok & LDAP_BACK_BINDING ) {
1241                                 LDAP_BACK_CONN_BINDING_SET( mc );
1242                         }
1243                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1244                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1245
1246                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1247                                 LDAP_BACK_CONN_ISANON_SET( mc );
1248                         }
1249
1250                 } else if ( 0 ) {
1251                         /* TODO: if any of the connections is binding,
1252                          * release mc and create a new one */
1253                 }
1254
1255                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1256                         /*
1257                          * The target is activated; if needed, it is
1258                          * also init'd
1259                          */
1260                         candidates[ i ].sr_err = meta_back_init_one_conn( op,
1261                                 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1262                                 LDAP_BACK_DONTSEND, !new_conn );
1263                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1264                                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1265                                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1266                                 }
1267                                 META_CANDIDATE_SET( &candidates[ i ] );
1268                                 ncandidates++;
1269
1270                         } else {
1271
1272                                 /*
1273                                  * FIXME: in case one target cannot
1274                                  * be init'd, should the other ones
1275                                  * be tried?
1276                                  */
1277                                 META_CANDIDATE_RESET( &candidates[ i ] );
1278                                 err = candidates[ i ].sr_err;
1279                                 continue;
1280                         }
1281                 }
1282
1283                 if ( ncandidates == 0 ) {
1284                         if ( new_conn ) {
1285                                 mc->mc_refcnt = 0;
1286                                 meta_back_conn_free( mc );
1287
1288                         } else {
1289                                 meta_back_release_conn( mi, mc );
1290                         }
1291
1292                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
1293                         rs->sr_text = "Unable to select valid candidates";
1294
1295                         if ( sendok & LDAP_BACK_SENDERR ) {
1296                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1297                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1298                                 }
1299                                 send_ldap_result( op, rs );
1300                                 rs->sr_matched = NULL;
1301                         }
1302
1303                         return NULL;
1304                 }
1305
1306                 goto done;
1307         }
1308
1309         /*
1310          * looks in cache, if any
1311          */
1312         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1313                 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1314         }
1315
1316         if ( op_type == META_OP_REQUIRE_SINGLE ) {
1317                 metatarget_t            *mt = NULL;
1318                 metasingleconn_t        *msc = NULL;
1319
1320                 int                     j;
1321
1322                 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1323                         META_CANDIDATE_RESET( &candidates[ j ] );
1324                 }
1325
1326                 /*
1327                  * tries to get a unique candidate
1328                  * (takes care of default target)
1329                  */
1330                 if ( i == META_TARGET_NONE ) {
1331                         i = meta_back_get_candidate( op, rs, &ndn );
1332
1333                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1334                                 i = meta_back_get_candidate( op, rs, &pndn );
1335                         }
1336
1337                         if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1338                                 if ( mc != NULL ) {
1339                                         meta_back_release_conn( mi, mc );
1340                                 }
1341
1342                                 if ( sendok & LDAP_BACK_SENDERR ) {
1343                                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1344                                                 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1345                                         }
1346                                         send_ldap_result( op, rs );
1347                                         rs->sr_matched = NULL;
1348                                 }
1349
1350                                 return NULL;
1351                         }
1352                 }
1353
1354                 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1355                 {
1356                         if ( mc != NULL ) {
1357                                 meta_back_release_conn( mi, mc );
1358                         }
1359
1360                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1361                         rs->sr_text = "Cross-target rename not supported";
1362                         if ( sendok & LDAP_BACK_SENDERR ) {
1363                                 send_ldap_result( op, rs );
1364                         }
1365
1366                         return NULL;
1367                 }
1368
1369                 Debug( LDAP_DEBUG_TRACE,
1370         "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1371                                 i, op->o_req_ndn.bv_val, 0 );
1372
1373                 if ( mc == NULL ) {
1374                         /* Retries searching for a metaconn in the avl tree
1375                          * the reason is that the connection might have been
1376                          * created by meta_back_get_candidate() */
1377                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
1378 retry_lock2:;
1379                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1380                                 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1381                                         (caddr_t)&mc_curr, meta_back_conndn_cmp );
1382                                 if ( mc != NULL ) {
1383                                         /* catch taint errors */
1384                                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1385
1386                                         /* Don't reuse connections while they're still binding */
1387                                         if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] )
1388                                                 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) )
1389                                         {
1390                                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1391                                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1392                                                         ldap_pvt_thread_yield();
1393                                                         goto retry_lock2;
1394                                                 }
1395
1396                                                 mc = NULL;
1397
1398                                         } else {
1399                                                 mc->mc_refcnt++;
1400                                         }
1401                                 }
1402                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1403                         }
1404
1405                         /* Looks like we didn't get a bind. Open a new session... */
1406                         if ( mc == NULL ) {
1407                                 assert( new_conn == 0 );
1408                                 mc = metaconn_alloc( op );
1409                                 mc->mc_conn = mc_curr.mc_conn;
1410                                 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1411                                 new_conn = 1;
1412                                 if ( sendok & LDAP_BACK_BINDING ) {
1413                                         LDAP_BACK_CONN_BINDING_SET( mc );
1414                                 }
1415                                 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1416                                         LDAP_BACK_CONN_ISPRIV_SET( mc );
1417
1418                                 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1419                                         LDAP_BACK_CONN_ISANON_SET( mc );
1420                                 }
1421                         }
1422                 }
1423
1424                 /*
1425                  * Clear all other candidates
1426                  */
1427                 ( void )meta_clear_unused_candidates( op, i );
1428
1429                 mt = mi->mi_targets[ i ];
1430                 msc = &mc->mc_conns[ i ];
1431
1432                 /*
1433                  * The target is activated; if needed, it is
1434                  * also init'd. In case of error, meta_back_init_one_conn
1435                  * sends the appropriate result.
1436                  */
1437                 err = meta_back_init_one_conn( op, rs, mc, i,
1438                         LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn );
1439                 if ( err != LDAP_SUCCESS ) {
1440                         /*
1441                          * FIXME: in case one target cannot
1442                          * be init'd, should the other ones
1443                          * be tried?
1444                          */
1445                         META_CANDIDATE_RESET( &candidates[ i ] );
1446                         if ( new_conn ) {
1447                                 mc->mc_refcnt = 0;
1448                                 meta_back_conn_free( mc );
1449
1450                         } else {
1451                                 meta_back_release_conn( mi, mc );
1452                         }
1453                         return NULL;
1454                 }
1455
1456                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1457                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1458                 }
1459
1460                 candidates[ i ].sr_err = LDAP_SUCCESS;
1461                 META_CANDIDATE_SET( &candidates[ i ] );
1462                 ncandidates++;
1463
1464                 if ( candidate ) {
1465                         *candidate = i;
1466                 }
1467
1468         /*
1469          * if no unique candidate ...
1470          */
1471         } else {
1472
1473                 /* Looks like we didn't get a bind. Open a new session... */
1474                 if ( mc == NULL ) {
1475                         assert( new_conn == 0 );
1476                         mc = metaconn_alloc( op );
1477                         mc->mc_conn = mc_curr.mc_conn;
1478                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1479                         new_conn = 1;
1480                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1481                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1482
1483                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1484                                 LDAP_BACK_CONN_ISANON_SET( mc );
1485                         }
1486                 }
1487
1488                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1489                         metatarget_t            *mt = mi->mi_targets[ i ];
1490
1491                         META_CANDIDATE_RESET( &candidates[ i ] );
1492
1493                         if ( i == cached
1494                                 || meta_back_is_candidate( mt, &op->o_req_ndn,
1495                                         LDAP_SCOPE_SUBTREE ) )
1496                         {
1497
1498                                 /*
1499                                  * The target is activated; if needed, it is
1500                                  * also init'd
1501                                  */
1502                                 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1503                                         LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1504                                         LDAP_BACK_DONTSEND, !new_conn );
1505                                 candidates[ i ].sr_err = lerr;
1506                                 if ( lerr == LDAP_SUCCESS ) {
1507                                         META_CANDIDATE_SET( &candidates[ i ] );
1508                                         ncandidates++;
1509
1510                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1511                                                 op->o_log_prefix, i, 0 );
1512
1513                                 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1514                                         META_CANDIDATE_SET( &candidates[ i ] );
1515
1516                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1517                                                 op->o_log_prefix, i,
1518                                                 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1519
1520                                 } else {
1521
1522                                         /*
1523                                          * FIXME: in case one target cannot
1524                                          * be init'd, should the other ones
1525                                          * be tried?
1526                                          */
1527                                         if ( new_conn ) {
1528                                                 ( void )meta_clear_one_candidate( op, mc, i );
1529                                         }
1530                                         /* leave the target candidate, but record the error for later use */
1531                                         err = lerr;
1532
1533                                         if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1534                                                 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined err=%d\n",
1535                                                         op->o_log_prefix, i, lerr );
1536
1537                                         } else {
1538                                                 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed err=%d\n",
1539                                                         op->o_log_prefix, i, lerr );
1540                                         }
1541
1542                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1543                                                 if ( sendok & LDAP_BACK_SENDERR ) {
1544                                                         send_ldap_result( op, rs );
1545                                                 }
1546                                                 if ( new_conn ) {
1547                                                         mc->mc_refcnt = 0;
1548                                                         meta_back_conn_free( mc );
1549
1550                                                 } else {
1551                                                         meta_back_release_conn( mi, mc );
1552                                                 }
1553
1554                                                 return NULL;
1555                                         }
1556
1557                                         continue;
1558                                 }
1559
1560                         } else {
1561                                 if ( new_conn ) {
1562                                         ( void )meta_clear_one_candidate( op, mc, i );
1563                                 }
1564                         }
1565                 }
1566
1567                 if ( ncandidates == 0 ) {
1568                         if ( new_conn ) {
1569                                 mc->mc_refcnt = 0;
1570                                 meta_back_conn_free( mc );
1571
1572                         } else {
1573                                 meta_back_release_conn( mi, mc );
1574                         }
1575
1576                         if ( rs->sr_err == LDAP_SUCCESS ) {
1577                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1578                                 rs->sr_text = "Unable to select valid candidates";
1579                         }
1580
1581                         if ( sendok & LDAP_BACK_SENDERR ) {
1582                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1583                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1584                                 }
1585                                 send_ldap_result( op, rs );
1586                                 rs->sr_matched = NULL;
1587                         }
1588
1589                         return NULL;
1590                 }
1591         }
1592
1593 done:;
1594         /* clear out meta_back_init_one_conn non-fatal errors */
1595         rs->sr_err = LDAP_SUCCESS;
1596         rs->sr_text = NULL;
1597
1598         /* touch the timestamp */
1599         if ( mi->mi_idle_timeout != 0 ) {
1600                 mc->mc_time = op->o_time;
1601         }
1602
1603         if ( new_conn ) {
1604                 if ( mi->mi_conn_ttl ) {
1605                         mc->mc_create_time = op->o_time;
1606                 }
1607
1608                 /*
1609                  * Inserts the newly created metaconn in the avl tree
1610                  */
1611                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1612 #if META_BACK_PRINT_CONNTREE > 0
1613                 meta_back_print_conntree( mi, ">>> meta_back_getconn" );
1614 #endif /* META_BACK_PRINT_CONNTREE */
1615
1616                 err = 0;
1617                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1618                         if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) {
1619                                 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1620                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++;
1621                                 LDAP_BACK_CONN_CACHED_SET( mc );
1622
1623                         } else {
1624                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1625                         }
1626                         rs->sr_err = 0;
1627
1628                 } else if ( !( sendok & LDAP_BACK_BINDING ) ) {
1629                         err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1630                                 meta_back_conndn_cmp, meta_back_conndn_dup );
1631                         LDAP_BACK_CONN_CACHED_SET( mc );
1632                 }
1633
1634 #if META_BACK_PRINT_CONNTREE > 0
1635                 meta_back_print_conntree( mi, "<<< meta_back_getconn" );
1636 #endif /* META_BACK_PRINT_CONNTREE */
1637                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1638
1639                 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1640                         /*
1641                          * Err could be -1 in case a duplicate metaconn is inserted
1642                          */
1643                         switch ( err ) {
1644                         case 0:
1645                                 break;
1646
1647                         case -1:
1648                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1649                                 /* duplicate: free and try to get the newly created one */
1650                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1651                                         mc->mc_refcnt = 0;
1652                                         meta_back_conn_free( mc );
1653
1654                                         new_conn = 0;
1655                                         goto retry_lock;
1656                                 }
1657
1658                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1659                                 break;
1660
1661                         default:
1662                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1663                                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
1664                                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1665                                         ldap_back_conn2str( (ldapconn_t *)mc, buf, sizeof(buf) );
1666
1667                                         Debug( LDAP_DEBUG_ANY,
1668                                                 "%s meta_back_getconn: candidates=%d conn=%s insert failed\n",
1669                                                 op->o_log_prefix, ncandidates, buf );
1670                                 }
1671
1672                                 mc->mc_refcnt = 0;
1673                                 meta_back_conn_free( mc );
1674
1675                                 rs->sr_err = LDAP_OTHER;
1676                                 rs->sr_text = "Proxy bind collision";
1677                                 if ( sendok & LDAP_BACK_SENDERR ) {
1678                                         send_ldap_result( op, rs );
1679                                 }
1680                                 return NULL;
1681                         }
1682                 }
1683
1684                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1685                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1686                         ldap_back_conn2str( (ldapconn_t *)mc, buf, sizeof(buf) );
1687
1688                         Debug( LDAP_DEBUG_TRACE,
1689                                 "%s meta_back_getconn: candidates=%d conn=%s inserted\n",
1690                                 op->o_log_prefix, ncandidates, buf );
1691                 }
1692
1693         } else {
1694                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1695                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1696                         ldap_back_conn2str( (ldapconn_t *)mc, buf, sizeof(buf) );
1697
1698                         Debug( LDAP_DEBUG_TRACE,
1699                                 "%s meta_back_getconn: candidates=%d conn=%s fetched\n",
1700                                 op->o_log_prefix, ncandidates, buf );
1701                 }
1702         }
1703
1704         return mc;
1705 }
1706
1707 void
1708 meta_back_release_conn_lock(
1709         metainfo_t              *mi,
1710         metaconn_t              *mc,
1711         int                     dolock )
1712 {
1713         assert( mc != NULL );
1714
1715         if ( dolock ) {
1716                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1717         }
1718         assert( mc->mc_refcnt > 0 );
1719         mc->mc_refcnt--;
1720         /* NOTE: the connection is removed if either it is tainted
1721          * or if it is shared and no one else is using it.  This needs
1722          * to occur because for intrinsic reasons cached connections
1723          * that are not privileged would live forever and pollute
1724          * the connection space (and eat up resources).  Maybe this
1725          * should be configurable... */
1726         if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) {
1727 #if META_BACK_PRINT_CONNTREE > 0
1728                 meta_back_print_conntree( mi, ">>> meta_back_release_conn" );
1729 #endif /* META_BACK_PRINT_CONNTREE */
1730
1731                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1732                         if ( mc->mc_q.tqe_prev != NULL ) {
1733                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
1734                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1735                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1736                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1737                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1738
1739                         } else {
1740                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1741                         }
1742
1743                 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) {
1744                         metaconn_t      *tmpmc;
1745
1746                         tmpmc = avl_delete( &mi->mi_conninfo.lai_tree,
1747                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
1748
1749                         /* Overparanoid, but useful... */
1750                         assert( tmpmc == NULL || tmpmc == mc );
1751                 }
1752
1753                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1754
1755 #if META_BACK_PRINT_CONNTREE > 0
1756                 meta_back_print_conntree( mi, "<<< meta_back_release_conn" );
1757 #endif /* META_BACK_PRINT_CONNTREE */
1758
1759                 if ( mc->mc_refcnt == 0 ) {
1760                         meta_back_conn_free( mc );
1761                         mc = NULL;
1762                 }
1763         }
1764
1765         if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) {
1766                 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1767         }
1768
1769         if ( dolock ) {
1770                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1771         }
1772 }
1773
1774 void
1775 meta_back_quarantine(
1776         Operation       *op,
1777         SlapReply       *rs,
1778         int             candidate )
1779 {
1780         metainfo_t              *mi = (metainfo_t *)op->o_bd->be_private;
1781         metatarget_t            *mt = mi->mi_targets[ candidate ];
1782
1783         slap_retry_info_t       *ri = &mt->mt_quarantine;
1784
1785         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1786
1787         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1788                 time_t  new_last = slap_get_time();
1789
1790                 switch ( mt->mt_isquarantined ) {
1791                 case LDAP_BACK_FQ_NO:
1792                         if ( ri->ri_last == new_last ) {
1793                                 goto done;
1794                         }
1795
1796                         Debug( LDAP_DEBUG_ANY,
1797                                 "%s meta_back_quarantine[%d]: enter.\n",
1798                                 op->o_log_prefix, candidate, 0 );
1799
1800                         ri->ri_idx = 0;
1801                         ri->ri_count = 0;
1802                         break;
1803
1804                 case LDAP_BACK_FQ_RETRYING:
1805                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
1806                                 char    buf[ SLAP_TEXT_BUFLEN ];
1807
1808                                 snprintf( buf, sizeof( buf ),
1809                                         "meta_back_quarantine[%d]: block #%d try #%d failed",
1810                                         candidate, ri->ri_idx, ri->ri_count );
1811                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1812                                         op->o_log_prefix, buf, 0 );
1813                         }
1814
1815                         ++ri->ri_count;
1816                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1817                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1818                         {
1819                                 ri->ri_count = 0;
1820                                 ++ri->ri_idx;
1821                         }
1822                         break;
1823
1824                 default:
1825                         break;
1826                 }
1827
1828                 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1829                 ri->ri_last = new_last;
1830
1831         } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1832                 Debug( LDAP_DEBUG_ANY,
1833                         "%s meta_back_quarantine[%d]: exit.\n",
1834                         op->o_log_prefix, candidate, 0 );
1835
1836                 if ( mi->mi_quarantine_f ) {
1837                         (void)mi->mi_quarantine_f( mi, candidate,
1838                                 mi->mi_quarantine_p );
1839                 }
1840
1841                 ri->ri_count = 0;
1842                 ri->ri_idx = 0;
1843                 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1844         }
1845
1846 done:;
1847         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
1848 }
1849