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 1999-2014 The OpenLDAP Foundation.
   5  * Portions Copyright 2001-2003 Pierangelo Masarati.
   6  * Portions Copyright 1999-2003 Howard Chu.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by the Howard Chu for inclusion
  19  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  20  * Masarati.
  21  */
  22
  23 #include "portable.h"
  24
  25 #include <stdio.h>
  26
  27 #include <ac/errno.h>
  28 #include <ac/socket.h>
  29 #include <ac/string.h>
  30
  31
  32 #define AVL_INTERNAL
  33 #include "slap.h"
  34 #include "../back-ldap/back-ldap.h"
  35 #include "back-meta.h"
  36
  37 /*
  38  * meta_back_conndn_cmp
  39  *
  40  * compares two struct metaconn based on the value of the conn pointer
  41  * and of the local DN; used by avl stuff
  42  */
  43 int
  44 meta_back_conndn_cmp(
  45         const void *c1,
  46         const void *c2 )
  47 {
  48         metaconn_t      *mc1 = ( metaconn_t * )c1;
  49         metaconn_t      *mc2 = ( metaconn_t * )c2;
  50         int             rc;
  51
  52         /* If local DNs don't match, it is definitely not a match */
  53         /* For shared sessions, conn is NULL. Only explicitly
  54          * bound sessions will have non-NULL conn.
  55          */
  56         rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
  57         if ( rc == 0 ) {
  58                 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
  59         }
  60
  61         return rc;
  62 }
  63
  64 /*
  65  * meta_back_conndnmc_cmp
  66  *
  67  * compares two struct metaconn based on the value of the conn pointer,
  68  * the local DN and the struct pointer; used by avl stuff
  69  */
  70 static int
  71 meta_back_conndnmc_cmp(
  72         const void *c1,
  73         const void *c2 )
  74 {
  75         metaconn_t      *mc1 = ( metaconn_t * )c1;
  76         metaconn_t      *mc2 = ( metaconn_t * )c2;
  77         int             rc;
  78
  79         /* If local DNs don't match, it is definitely not a match */
  80         /* For shared sessions, conn is NULL. Only explicitly
  81          * bound sessions will have non-NULL conn.
  82          */
  83         rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
  84         if ( rc == 0 ) {
  85                 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn );
  86                 if ( rc == 0 ) {
  87                         rc = SLAP_PTRCMP( mc1, mc2 );
  88                 }
  89         }
  90
  91         return rc;
  92 }
  93
  94 /*
  95  * meta_back_conn_cmp
  96  *
  97  * compares two struct metaconn based on the value of the conn pointer;
  98  * used by avl stuff
  99  */
 100 int
 101 meta_back_conn_cmp(
 102         const void *c1,
 103         const void *c2 )
 104 {
 105         metaconn_t      *mc1 = ( metaconn_t * )c1;
 106         metaconn_t      *mc2 = ( metaconn_t * )c2;
 107
 108         /* For shared sessions, conn is NULL. Only explicitly
 109          * bound sessions will have non-NULL conn.
 110          */
 111         return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
 112 }
 113
 114 /*
 115  * meta_back_conndn_dup
 116  *
 117  * returns -1 in case a duplicate struct metaconn has been inserted;
 118  * used by avl stuff
 119  */
 120 int
 121 meta_back_conndn_dup(
 122         void *c1,
 123         void *c2 )
 124 {
 125         metaconn_t      *mc1 = ( metaconn_t * )c1;
 126         metaconn_t      *mc2 = ( metaconn_t * )c2;
 127
 128         /* Cannot have more than one shared session with same DN */
 129         if ( mc1->mc_conn == mc2->mc_conn &&
 130                 dn_match( &mc1->mc_local_ndn, &mc2->mc_local_ndn ) )
 131         {
 132                 return -1;
 133         }
 134
 135         return 0;
 136 }
 137
 138 /*
 139  * Debug stuff (got it from libavl)
 140  */
 141 #if META_BACK_PRINT_CONNTREE > 0
 142 static void
 143 meta_back_print( metaconn_t *mc, char *avlstr )
 144 {
 145         int     i;
 146
 147         fputs( "targets=[", stderr );
 148         for ( i = 0; i < mc->mc_info->mi_ntargets; i++ ) {
 149                 fputc( mc->mc_conns[ i ].msc_ld ? '*' : 'o', stderr);
 150         }
 151         fputc( ']', stderr );
 152
 153         fprintf( stderr, " mc=%p local=\"%s\" conn=%p refcnt=%d%s %s\n",
 154                 (void *)mc,
 155                 mc->mc_local_ndn.bv_val ? mc->mc_local_ndn.bv_val : "",
 156                 (void *)mc->mc_conn,
 157                 mc->mc_refcnt,
 158                 LDAP_BACK_CONN_TAINTED( mc ) ? " tainted" : "",
 159                 avlstr );
 160 }
 161
 162 static void
 163 meta_back_ravl_print( Avlnode *root, int depth )
 164 {
 165         int             i;
 166
 167         if ( root == 0 ) {
 168                 return;
 169         }
 170
 171         meta_back_ravl_print( root->avl_right, depth + 1 );
 172
 173         for ( i = 0; i < depth; i++ ) {
 174                 fprintf( stderr, "-" );
 175         }
 176         fputc( ' ', stderr );
 177
 178         meta_back_print( (metaconn_t *)root->avl_data,
 179                 avl_bf2str( root->avl_bf ) );
 180
 181         meta_back_ravl_print( root->avl_left, depth + 1 );
 182 }
 183
 184 /* NOTE: duplicate from back-ldap/bind.c */
 185 static char* priv2str[] = {
 186         "privileged",
 187         "privileged/TLS",
 188         "anonymous",
 189         "anonymous/TLS",
 190         "bind",
 191         "bind/TLS",
 192         NULL
 193 };
 194
 195 void
 196 meta_back_print_conntree( metainfo_t *mi, char *msg )
 197 {
 198         int     c;
 199
 200         fprintf( stderr, "========> %s\n", msg );
 201
 202         for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) {
 203                 int             i = 0;
 204                 metaconn_t      *mc;
 205
 206                 fprintf( stderr, "  %s[%d]\n", priv2str[ c ], mi->mi_conn_priv[ c ].mic_num );
 207
 208                 LDAP_TAILQ_FOREACH( mc, &mi->mi_conn_priv[ c ].mic_priv, mc_q )
 209                 {
 210                         fprintf( stderr, "    [%d] ", i );
 211                         meta_back_print( mc, "" );
 212                         i++;
 213                 }
 214         }
 215
 216         if ( mi->mi_conninfo.lai_tree == NULL ) {
 217                 fprintf( stderr, "\t(empty)\n" );
 218
 219         } else {
 220                 meta_back_ravl_print( mi->mi_conninfo.lai_tree, 0 );
 221         }
 222
 223         fprintf( stderr, "<======== %s\n", msg );
 224 }
 225 #endif /* META_BACK_PRINT_CONNTREE */
 226 /*
 227  * End of debug stuff
 228  */
 229
 230 /*
 231  * metaconn_alloc
 232  *
 233  * Allocates a connection structure, making room for all the referenced targets
 234  */
 235 static metaconn_t *
 236 metaconn_alloc(
 237         Operation               *op )
 238 {
 239         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 240         metaconn_t      *mc;
 241         int             ntargets = mi->mi_ntargets;
 242
 243         assert( ntargets > 0 );
 244
 245         /* malloc all in one */
 246         mc = ( metaconn_t * )ch_calloc( 1, sizeof( metaconn_t )
 247                 + sizeof( metasingleconn_t ) * ( ntargets - 1 ) );
 248         if ( mc == NULL ) {
 249                 return NULL;
 250         }
 251
 252         mc->mc_info = mi;
 253
 254         mc->mc_authz_target = META_BOUND_NONE;
 255         mc->mc_refcnt = 1;
 256
 257         return mc;
 258 }
 259
 260 /*
 261  * meta_back_init_one_conn
 262  *
 263  * Initializes one connection
 264  */
 265 int
 266 meta_back_init_one_conn(
 267         Operation               *op,
 268         SlapReply               *rs,
 269         metaconn_t              *mc,
 270         int                     candidate,
 271         int                     ispriv,
 272         ldap_back_send_t        sendok,
 273         int                     dolock )
 274 {
 275         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 276         metatarget_t            *mt = mi->mi_targets[ candidate ];
 277         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 278         int                     version;
 279         dncookie                dc;
 280         int                     isauthz = ( candidate == mc->mc_authz_target );
 281         int                     do_return = 0;
 282 #ifdef HAVE_TLS
 283         int                     is_ldaps = 0;
 284         int                     do_start_tls = 0;
 285 #endif /* HAVE_TLS */
 286
 287         /* if the server is quarantined, and
 288          * - the current interval did not expire yet, or
 289          * - no more retries should occur,
 290          * don't return the connection */
 291         if ( mt->mt_isquarantined ) {
 292                 slap_retry_info_t       *ri = &mt->mt_quarantine;
 293                 int                     dont_retry = 0;
 294
 295                 if ( mt->mt_quarantine.ri_interval ) {
 296                         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
 297                         dont_retry = ( mt->mt_isquarantined > LDAP_BACK_FQ_NO );
 298                         if ( dont_retry ) {
 299                                 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 300                                         || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 301                                 if ( !dont_retry ) {
 302                                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
 303                                                 char    buf[ SLAP_TEXT_BUFLEN ];
 304
 305                                                 snprintf( buf, sizeof( buf ),
 306                                                         "meta_back_init_one_conn[%d]: quarantine "
 307                                                         "retry block #%d try #%d",
 308                                                         candidate, ri->ri_idx, ri->ri_count );
 309                                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
 310                                                         op->o_log_prefix, buf, 0 );
 311                                         }
 312
 313                                         mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING;
 314                                 }
 315
 316                         }
 317                         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
 318                 }
 319
 320                 if ( dont_retry ) {
 321                         rs->sr_err = LDAP_UNAVAILABLE;
 322                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 323                                 rs->sr_text = "Target is quarantined";
 324                                 send_ldap_result( op, rs );
 325                         }
 326                         return rs->sr_err;
 327                 }
 328         }
 329
 330 retry_lock:;
 331         if ( dolock ) {
 332                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 333         }
 334
 335         /*
 336          * Already init'ed
 337          */
 338         if ( LDAP_BACK_CONN_ISBOUND( msc )
 339                 || LDAP_BACK_CONN_ISANON( msc ) )
 340         {
 341                 assert( msc->msc_ld != NULL );
 342                 rs->sr_err = LDAP_SUCCESS;
 343                 do_return = 1;
 344
 345         } else if ( META_BACK_CONN_CREATING( msc )
 346                 || LDAP_BACK_CONN_BINDING( msc ) )
 347         {
 348                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
 349                         if ( dolock ) {
 350                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 351                         }
 352
 353                         ldap_pvt_thread_yield();
 354                         goto retry_lock;
 355                 }
 356
 357                 /* sounds more appropriate */
 358                 rs->sr_err = LDAP_BUSY;
 359                 rs->sr_text = "No connections to target are available";
 360                 do_return = 1;
 361
 362         } else if ( META_BACK_CONN_INITED( msc ) ) {
 363                 assert( msc->msc_ld != NULL );
 364                 rs->sr_err = LDAP_SUCCESS;
 365                 do_return = 1;
 366
 367         } else {
 368                 /*
 369                  * creating...
 370                  */
 371                 META_BACK_CONN_CREATING_SET( msc );
 372         }
 373
 374         if ( dolock ) {
 375                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 376         }
 377
 378         if ( do_return ) {
 379                 if ( rs->sr_err != LDAP_SUCCESS
 380                         && op->o_conn
 381                         && ( sendok & LDAP_BACK_SENDERR ) )
 382                 {
 383                         send_ldap_result( op, rs );
 384                 }
 385
 386                 return rs->sr_err;
 387         }
 388
 389         assert( msc->msc_ld == NULL );
 390
 391         /*
 392          * Attempts to initialize the connection to the target ds
 393          */
 394         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 395         rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
 396 #ifdef HAVE_TLS
 397         is_ldaps = ldap_is_ldaps_url( mt->mt_uri );
 398 #endif /* HAVE_TLS */
 399         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 400         if ( rs->sr_err != LDAP_SUCCESS ) {
 401                 goto error_return;
 402         }
 403
 404         /*
 405          * Set LDAP version. This will always succeed: If the client
 406          * bound with a particular version, then so can we.
 407          */
 408         if ( mt->mt_version != 0 ) {
 409                 version = mt->mt_version;
 410
 411         } else if ( op->o_conn->c_protocol != 0 ) {
 412                 version = op->o_conn->c_protocol;
 413
 414         } else {
 415                 version = LDAP_VERSION3;
 416         }
 417         ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version );
 418         ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p );
 419
 420         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 421         ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
 422                 META_BACK_TGT_CHASE_REFERRALS( mt ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 423
 424         slap_client_keepalive(msc->msc_ld, &mt->mt_tls.sb_keepalive);
 425
 426 #ifdef HAVE_TLS
 427         {
 428                 slap_bindconf *sb = NULL;
 429
 430                 if ( ispriv ) {
 431                         sb = &mt->mt_idassert.si_bc;
 432                 } else {
 433                         sb = &mt->mt_tls;
 434                 }
 435
 436                 if ( sb->sb_tls_do_init ) {
 437                         bindconf_tls_set( sb, msc->msc_ld );
 438                 } else if ( sb->sb_tls_ctx ) {
 439                         ldap_set_option( msc->msc_ld, LDAP_OPT_X_TLS_CTX, sb->sb_tls_ctx );
 440                 }
 441
 442                 if ( !is_ldaps ) {
 443                         if ( sb == &mt->mt_idassert.si_bc && sb->sb_tls_ctx ) {
 444                                 do_start_tls = 1;
 445
 446                         } else if ( META_BACK_TGT_USE_TLS( mt )
 447                                 || ( op->o_conn->c_is_tls && META_BACK_TGT_PROPAGATE_TLS( mt ) ) )
 448                         {
 449                                 do_start_tls = 1;
 450                         }
 451                 }
 452         }
 453
 454         /* start TLS ("tls [try-]{start|propagate}" statement) */
 455         if ( do_start_tls ) {
 456 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 457                 /*
 458                  * use asynchronous StartTLS; in case, chase referral
 459                  * FIXME: OpenLDAP does not return referral on StartTLS yet
 460                  */
 461                 int             msgid;
 462
 463                 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
 464                 if ( rs->sr_err == LDAP_SUCCESS ) {
 465                         LDAPMessage     *res = NULL;
 466                         int             rc, nretries = mt->mt_nretries;
 467                         struct timeval  tv;
 468
 469                         LDAP_BACK_TV_SET( &tv );
 470
 471 retry:;
 472                         rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 473                         switch ( rc ) {
 474                         case -1:
 475                                 rs->sr_err = LDAP_OTHER;
 476                                 break;
 477
 478                         case 0:
 479                                 if ( nretries != 0 ) {
 480                                         if ( nretries > 0 ) {
 481                                                 nretries--;
 482                                         }
 483                                         LDAP_BACK_TV_SET( &tv );
 484                                         goto retry;
 485                                 }
 486                                 rs->sr_err = LDAP_OTHER;
 487                                 break;
 488
 489                         default:
 490                                 /* only touch when activity actually took place... */
 491                                 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
 492                                         msc->msc_time = op->o_time;
 493                                 }
 494                                 break;
 495                         }
 496
 497                         if ( rc == LDAP_RES_EXTENDED ) {
 498                                 struct berval   *data = NULL;
 499
 500                                 /* NOTE: right now, data is unused, so don't get it */
 501                                 rs->sr_err = ldap_parse_extended_result( msc->msc_ld,
 502                                         res, NULL, NULL /* &data */ , 0 );
 503                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 504                                         int             err;
 505
 506                                         /* FIXME: matched? referrals? response controls? */
 507                                         rs->sr_err = ldap_parse_result( msc->msc_ld,
 508                                                 res, &err, NULL, NULL, NULL, NULL, 1 );
 509                                         res = NULL;
 510
 511                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 512                                                 rs->sr_err = err;
 513                                         }
 514                                         rs->sr_err = slap_map_api2result( rs );
 515
 516                                         /* FIXME: in case a referral
 517                                          * is returned, should we try
 518                                          * using it instead of the
 519                                          * configured URI? */
 520                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 521                                                 ldap_install_tls( msc->msc_ld );
 522
 523                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 524                                                 /* FIXME: LDAP_OPERATIONS_ERROR? */
 525                                                 rs->sr_err = LDAP_OTHER;
 526                                                 rs->sr_text = "Unwilling to chase referral "
 527                                                         "returned by Start TLS exop";
 528                                         }
 529
 530                                         if ( data ) {
 531                                                 ber_bvfree( data );
 532                                         }
 533                                 }
 534
 535                         } else {
 536                                 rs->sr_err = LDAP_OTHER;
 537                         }
 538
 539                         if ( res != NULL ) {
 540                                 ldap_msgfree( res );
 541                         }
 542                 }
 543 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 544                 /*
 545                  * use synchronous StartTLS
 546                  */
 547                 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
 548 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 549
 550                 /* if StartTLS is requested, only attempt it if the URL
 551                  * is not "ldaps://"; this may occur not only in case
 552                  * of misconfiguration, but also when used in the chain
 553                  * overlay, where the "uri" can be parsed out of a referral */
 554                 if ( rs->sr_err == LDAP_SERVER_DOWN
 555                         || ( rs->sr_err != LDAP_SUCCESS
 556                                 && META_BACK_TGT_TLS_CRITICAL( mt ) ) )
 557                 {
 558
 559 #ifdef DEBUG_205
 560                         Debug( LDAP_DEBUG_ANY,
 561                                 "### %s meta_back_init_one_conn(TLS) "
 562                                 "ldap_unbind_ext[%d] ld=%p\n",
 563                                 op->o_log_prefix, candidate,
 564                                 (void *)msc->msc_ld );
 565 #endif /* DEBUG_205 */
 566
 567                         /* need to trash a failed Start TLS */
 568                         meta_clear_one_candidate( op, mc, candidate );
 569                         goto error_return;
 570                 }
 571         }
 572 #endif /* HAVE_TLS */
 573
 574         /*
 575          * Set the network timeout if set
 576          */
 577         if ( mt->mt_network_timeout != 0 ) {
 578                 struct timeval  network_timeout;
 579
 580                 network_timeout.tv_usec = 0;
 581                 network_timeout.tv_sec = mt->mt_network_timeout;
 582
 583                 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
 584                                 (void *)&network_timeout );
 585         }
 586
 587         /*
 588          * If the connection DN is not null, an attempt to rewrite it is made
 589          */
 590
 591         if ( ispriv ) {
 592                 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
 593                         ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
 594                         if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
 595                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 596                                         memset( msc->msc_cred.bv_val, 0,
 597                                                 msc->msc_cred.bv_len );
 598                                 }
 599                                 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
 600                         }
 601                         LDAP_BACK_CONN_ISIDASSERT_SET( msc );
 602
 603                 } else {
 604                         ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
 605                 }
 606
 607         } else {
 608                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 609                         memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 610                         ber_memfree_x( msc->msc_cred.bv_val, NULL );
 611                         BER_BVZERO( &msc->msc_cred );
 612                 }
 613                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 614                         ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
 615                         BER_BVZERO( &msc->msc_bound_ndn );
 616                 }
 617                 if ( !BER_BVISEMPTY( &op->o_ndn )
 618                         && SLAP_IS_AUTHZ_BACKEND( op )
 619                         && isauthz )
 620                 {
 621                         dc.target = mt;
 622                         dc.conn = op->o_conn;
 623                         dc.rs = rs;
 624                         dc.ctx = "bindDN";
 625
 626                         /*
 627                          * Rewrite the bind dn if needed
 628                          */
 629                         if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
 630                                                 &msc->msc_bound_ndn ) )
 631                         {
 632
 633 #ifdef DEBUG_205
 634                                 Debug( LDAP_DEBUG_ANY,
 635                                         "### %s meta_back_init_one_conn(rewrite) "
 636                                         "ldap_unbind_ext[%d] ld=%p\n",
 637                                         op->o_log_prefix, candidate,
 638                                         (void *)msc->msc_ld );
 639 #endif /* DEBUG_205 */
 640
 641                                 /* need to trash a connection not fully established */
 642                                 meta_clear_one_candidate( op, mc, candidate );
 643                                 goto error_return;
 644                         }
 645
 646                         /* copy the DN if needed */
 647                         if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
 648                                 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
 649                         }
 650
 651                         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 652
 653                 } else {
 654                         ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
 655                 }
 656         }
 657
 658         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 659
 660 error_return:;
 661         if ( dolock ) {
 662                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 663         }
 664         META_BACK_CONN_CREATING_CLEAR( msc );
 665         if ( rs->sr_err == LDAP_SUCCESS ) {
 666                 /*
 667                  * Sets a cookie for the rewrite session
 668                  */
 669                 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
 670                 META_BACK_CONN_INITED_SET( msc );
 671         }
 672         if ( dolock ) {
 673                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 674         }
 675
 676         if ( rs->sr_err != LDAP_SUCCESS ) {
 677                 rs->sr_err = slap_map_api2result( rs );
 678                 if ( sendok & LDAP_BACK_SENDERR ) {
 679                         send_ldap_result( op, rs );
 680                 }
 681         }
 682
 683         return rs->sr_err;
 684 }
 685
 686 /*
 687  * meta_back_retry
 688  *
 689  * Retries one connection
 690  */
 691 int
 692 meta_back_retry(
 693         Operation               *op,
 694         SlapReply               *rs,
 695         metaconn_t              **mcp,
 696         int                     candidate,
 697         ldap_back_send_t        sendok )
 698 {
 699         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 700         metatarget_t            *mt = mi->mi_targets[ candidate ];
 701         metaconn_t              *mc = *mcp;
 702         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 703         int                     rc = LDAP_UNAVAILABLE,
 704                                 binding,
 705                                 quarantine = 1;
 706
 707         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 708
 709         assert( !META_BACK_CONN_CREATING( msc ) );
 710         binding = LDAP_BACK_CONN_BINDING( msc );
 711         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 712
 713         assert( mc->mc_refcnt > 0 );
 714         if ( mc->mc_refcnt == 1 ) {
 715                 struct berval save_cred;
 716
 717                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
 718                         char    buf[ SLAP_TEXT_BUFLEN ];
 719
 720                         /* this lock is required; however,
 721                          * it's invoked only when logging is on */
 722                         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 723                         snprintf( buf, sizeof( buf ),
 724                                 "retrying URI=\"%s\" DN=\"%s\"",
 725                                 mt->mt_uri,
 726                                 BER_BVISNULL( &msc->msc_bound_ndn ) ?
 727                                         "" : msc->msc_bound_ndn.bv_val );
 728                         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 729
 730                         Debug( LDAP_DEBUG_ANY,
 731                                 "%s meta_back_retry[%d]: %s.\n",
 732                                 op->o_log_prefix, candidate, buf );
 733                 }
 734
 735                 /* save credentials, if any, for later use;
 736                  * meta_clear_one_candidate() would free them */
 737                 save_cred = msc->msc_cred;
 738                 BER_BVZERO( &msc->msc_cred );
 739
 740                 meta_clear_one_candidate( op, mc, candidate );
 741                 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 742
 743                 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 744
 745                 /* mc here must be the regular mc, reset and ready for init */
 746                 rc = meta_back_init_one_conn( op, rs, mc, candidate,
 747                         LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 );
 748
 749                 /* restore credentials, if any and if needed;
 750                  * meta_back_init_one_conn() restores msc_bound_ndn, if any;
 751                  * if no msc_bound_ndn is restored, destroy credentials */
 752                 if ( !BER_BVISNULL( &msc->msc_bound_ndn )
 753                         && BER_BVISNULL( &msc->msc_cred ) )
 754                 {
 755                         msc->msc_cred = save_cred;
 756
 757                 } else if ( !BER_BVISNULL( &save_cred ) ) {
 758                         memset( save_cred.bv_val, 0, save_cred.bv_len );
 759                         ber_memfree_x( save_cred.bv_val, NULL );
 760                 }
 761
 762                 /* restore the "binding" flag, in case */
 763                 if ( binding ) {
 764                         LDAP_BACK_CONN_BINDING_SET( msc );
 765                 }
 766
 767                 if ( rc == LDAP_SUCCESS ) {
 768                         quarantine = 0;
 769                         LDAP_BACK_CONN_BINDING_SET( msc ); binding = 1;
 770                         rc = meta_back_single_dobind( op, rs, mcp, candidate,
 771                                 sendok, mt->mt_nretries, 0 );
 772
 773                         Debug( LDAP_DEBUG_ANY,
 774                                 "%s meta_back_retry[%d]: "
 775                                 "meta_back_single_dobind=%d\n",
 776                                 op->o_log_prefix, candidate, rc );
 777                         if ( rc == LDAP_SUCCESS ) {
 778                                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
 779                                         !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 780                                 {
 781                                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 782
 783                                 } else {
 784                                         LDAP_BACK_CONN_ISANON_SET( msc );
 785                                 }
 786
 787                                 /* when bound, dispose of the "binding" flag */
 788                                 if ( binding ) {
 789                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 790                                 }
 791                         }
 792                 }
 793
 794 #if 0   /* ITS#7591, following stmt drops needed result msgs */
 795                 /* don't send twice */
 796                 sendok &= ~LDAP_BACK_SENDERR;
 797 #endif
 798         }
 799
 800         if ( rc != LDAP_SUCCESS ) {
 801                 SlapReply               *candidates = meta_back_candidates_get( op );
 802
 803                 candidates[ candidate ].sr_err = rc;
 804
 805                 if ( *mcp != NULL ) {
 806                         if ( mc->mc_refcnt == 1 ) {
 807                                 if ( binding ) {
 808                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 809                                 }
 810                                 (void)meta_clear_one_candidate( op, mc, candidate );
 811                         }
 812
 813                         LDAP_BACK_CONN_TAINTED_SET( mc );
 814                         /* only release if mandatory; otherwise
 815                          * let the caller do what's best before
 816                          * releasing */
 817                         if ( META_BACK_ONERR_STOP( mi ) ) {
 818                                 meta_back_release_conn_lock( mi, mc, 0 );
 819                                 *mcp = NULL;
 820
 821                         } else {
 822 #if META_BACK_PRINT_CONNTREE > 0
 823                                 meta_back_print_conntree( mi, ">>> meta_back_retry" );
 824 #endif /* META_BACK_PRINT_CONNTREE */
 825
 826                                 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */
 827                                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
 828                                         if ( mc->mc_q.tqe_prev != NULL ) {
 829                                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
 830                                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
 831                                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
 832                                                         mc, mc_q );
 833                                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
 834                                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
 835
 836                                         } else {
 837                                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
 838                                         }
 839
 840                                 } else {
 841                                         /* FIXME: check if in tree, for consistency? */
 842                                         (void)avl_delete( &mi->mi_conninfo.lai_tree,
 843                                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
 844                                 }
 845                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
 846
 847 #if META_BACK_PRINT_CONNTREE > 0
 848                                 meta_back_print_conntree( mi, "<<< meta_back_retry" );
 849 #endif /* META_BACK_PRINT_CONNTREE */
 850                         }
 851                 }
 852
 853                 if ( sendok & LDAP_BACK_SENDERR ) {
 854                         rs->sr_err = rc;
 855                         rs->sr_text = "Unable to retry";
 856                         send_ldap_result( op, rs );
 857                 }
 858         }
 859
 860         if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) {
 861                 meta_back_quarantine( op, rs, candidate );
 862         }
 863
 864         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 865
 866         return rc == LDAP_SUCCESS ? 1 : 0;
 867 }
 868
 869 /*
 870  * callback for unique candidate selection
 871  */
 872 static int
 873 meta_back_conn_cb( Operation *op, SlapReply *rs )
 874 {
 875         assert( op->o_tag == LDAP_REQ_SEARCH );
 876
 877         switch ( rs->sr_type ) {
 878         case REP_SEARCH:
 879                 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
 880                 break;
 881
 882         case REP_SEARCHREF:
 883         case REP_RESULT:
 884                 break;
 885
 886         default:
 887                 return rs->sr_err;
 888         }
 889
 890         return 0;
 891 }
 892
 893
 894 static int
 895 meta_back_get_candidate(
 896         Operation       *op,
 897         SlapReply       *rs,
 898         struct berval   *ndn )
 899 {
 900         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 901         long            candidate;
 902
 903         /*
 904          * tries to get a unique candidate
 905          * (takes care of default target)
 906          */
 907         candidate = meta_back_select_unique_candidate( mi, ndn );
 908
 909         /*
 910          * if any is found, inits the connection
 911          */
 912         if ( candidate == META_TARGET_NONE ) {
 913                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 914                 rs->sr_text = "No suitable candidate target found";
 915
 916         } else if ( candidate == META_TARGET_MULTIPLE ) {
 917                 Operation       op2 = *op;
 918                 SlapReply       rs2 = { REP_RESULT };
 919                 slap_callback   cb2 = { 0 };
 920                 int             rc;
 921
 922                 /* try to get a unique match for the request ndn
 923                  * among the multiple candidates available */
 924                 op2.o_tag = LDAP_REQ_SEARCH;
 925                 op2.o_req_dn = *ndn;
 926                 op2.o_req_ndn = *ndn;
 927                 op2.ors_scope = LDAP_SCOPE_BASE;
 928                 op2.ors_deref = LDAP_DEREF_NEVER;
 929                 op2.ors_attrs = slap_anlist_no_attrs;
 930                 op2.ors_attrsonly = 0;
 931                 op2.ors_limit = NULL;
 932                 op2.ors_slimit = 1;
 933                 op2.ors_tlimit = SLAP_NO_LIMIT;
 934
 935                 op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
 936                 op2.ors_filterstr = *slap_filterstr_objectClass_pres;
 937
 938                 op2.o_callback = &cb2;
 939                 cb2.sc_response = meta_back_conn_cb;
 940                 cb2.sc_private = (void *)&candidate;
 941
 942                 rc = op->o_bd->be_search( &op2, &rs2 );
 943
 944                 switch ( rs2.sr_err ) {
 945                 case LDAP_SUCCESS:
 946                 default:
 947                         rs->sr_err = rs2.sr_err;
 948                         break;
 949
 950                 case LDAP_SIZELIMIT_EXCEEDED:
 951                         /* if multiple candidates can serve the operation,
 952                          * and a default target is defined, and it is
 953                          * a candidate, try using it (FIXME: YMMV) */
 954                         if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
 955                                 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
 956                                                 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
 957                         {
 958                                 candidate = mi->mi_defaulttarget;
 959                                 rs->sr_err = LDAP_SUCCESS;
 960                                 rs->sr_text = NULL;
 961
 962                         } else {
 963                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 964                                 rs->sr_text = "Unable to select unique candidate target";
 965                         }
 966                         break;
 967                 }
 968
 969         } else {
 970                 rs->sr_err = LDAP_SUCCESS;
 971         }
 972
 973         return candidate;
 974 }
 975
 976 static void     *meta_back_candidates_dummy;
 977
 978 static void
 979 meta_back_candidates_keyfree(
 980         void            *key,
 981         void            *data )
 982 {
 983         metacandidates_t        *mc = (metacandidates_t *)data;
 984
 985         ber_memfree_x( mc->mc_candidates, NULL );
 986         ber_memfree_x( data, NULL );
 987 }
 988
 989 SlapReply *
 990 meta_back_candidates_get( Operation *op )
 991 {
 992         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 993         metacandidates_t        *mc;
 994
 995         if ( op->o_threadctx ) {
 996                 void            *data = NULL;
 997
 998                 ldap_pvt_thread_pool_getkey( op->o_threadctx,
 999                                 &meta_back_candidates_dummy, &data, NULL );
1000                 mc = (metacandidates_t *)data;
1001
1002         } else {
1003                 mc = mi->mi_candidates;
1004         }
1005
1006         if ( mc == NULL ) {
1007                 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
1008                 mc->mc_ntargets = mi->mi_ntargets;
1009                 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
1010                 if ( op->o_threadctx ) {
1011                         void            *data = NULL;
1012
1013                         data = (void *)mc;
1014                         ldap_pvt_thread_pool_setkey( op->o_threadctx,
1015                                         &meta_back_candidates_dummy, data,
1016                                         meta_back_candidates_keyfree,
1017                                         NULL, NULL );
1018
1019                 } else {
1020                         mi->mi_candidates = mc;
1021                 }
1022
1023         } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
1024                 /* NOTE: in the future, may want to allow back-config
1025                  * to add/remove targets from back-meta... */
1026                 mc->mc_candidates = ch_realloc( mc->mc_candidates,
1027                                 sizeof( SlapReply ) * mi->mi_ntargets );
1028                 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
1029                         sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
1030                 mc->mc_ntargets = mi->mi_ntargets;
1031         }
1032
1033         return mc->mc_candidates;
1034 }
1035
1036 /*
1037  * meta_back_getconn
1038  *
1039  * Prepares the connection structure
1040  *
1041  * RATIONALE:
1042  *
1043  * - determine what DN is being requested:
1044  *
1045  *      op      requires candidate      checks
1046  *
1047  *      add     unique                  parent of o_req_ndn
1048  *      bind    unique^*[/all]          o_req_ndn [no check]
1049  *      compare unique^+                o_req_ndn
1050  *      delete  unique                  o_req_ndn
1051  *      modify  unique                  o_req_ndn
1052  *      search  any                     o_req_ndn
1053  *      modrdn  unique[, unique]        o_req_ndn[, orr_nnewSup]
1054  *
1055  * - for ops that require the candidate to be unique, in case of multiple
1056  *   occurrences an internal search with sizeLimit=1 is performed
1057  *   if a unique candidate can actually be determined.  If none is found,
1058  *   the operation aborts; if multiple are found, the default target
1059  *   is used if defined and candidate; otherwise the operation aborts.
1060  *
1061  * *^note: actually, the bind operation is handled much like a search;
1062  *   i.e. the bind is broadcast to all candidate targets.
1063  *
1064  * +^note: actually, the compare operation is handled much like a search;
1065  *   i.e. the compare is broadcast to all candidate targets, while checking
1066  *   that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
1067  *   returned.
1068  */
1069 metaconn_t *
1070 meta_back_getconn(
1071         Operation               *op,
1072         SlapReply               *rs,
1073         int                     *candidate,
1074         ldap_back_send_t        sendok )
1075 {
1076         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
1077         metaconn_t      *mc = NULL,
1078                         mc_curr = {{ 0 }};
1079         int             cached = META_TARGET_NONE,
1080                         i = META_TARGET_NONE,
1081                         err = LDAP_SUCCESS,
1082                         new_conn = 0,
1083                         ncandidates = 0;
1084
1085
1086         meta_op_type    op_type = META_OP_REQUIRE_SINGLE;
1087         enum            {
1088                 META_DNTYPE_ENTRY,
1089                 META_DNTYPE_PARENT,
1090                 META_DNTYPE_NEWPARENT
1091         }               dn_type = META_DNTYPE_ENTRY;
1092         struct berval   ndn = op->o_req_ndn,
1093                         pndn;
1094
1095         SlapReply       *candidates = meta_back_candidates_get( op );
1096
1097         /* Internal searches are privileged and shared. So is root. */
1098         if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) )
1099                 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) )
1100                 || op->o_do_not_cache || be_isroot( op ) )
1101         {
1102                 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
1103                 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
1104                 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op );
1105
1106         } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) )
1107         {
1108                 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1109                 BER_BVSTR( &mc_curr.mc_local_ndn, "" );
1110                 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1111
1112         } else {
1113                 mc_curr.mc_local_ndn = op->o_ndn;
1114
1115                 /* Explicit binds must not be shared */
1116                 if ( !BER_BVISEMPTY( &op->o_ndn )
1117                         || op->o_tag == LDAP_REQ_BIND
1118                         || SLAP_IS_AUTHZ_BACKEND( op ) )
1119                 {
1120                         mc_curr.mc_conn = op->o_conn;
1121
1122                 } else {
1123                         LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1124                         LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1125                 }
1126         }
1127
1128         /* Explicit Bind requests always get their own conn */
1129         if ( sendok & LDAP_BACK_BINDING ) {
1130                 mc_curr.mc_conn = op->o_conn;
1131
1132         } else {
1133                 /* Searches for a metaconn in the avl tree */
1134 retry_lock:;
1135                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1136                 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) {
1137                         /* lookup a conn that's not binding */
1138                         LDAP_TAILQ_FOREACH( mc,
1139                                 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv,
1140                                 mc_q )
1141                         {
1142                                 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) {
1143                                         break;
1144                                 }
1145                         }
1146
1147                         if ( mc != NULL ) {
1148                                 /* move to tail of queue */
1149                                 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1150                                         metaconn_t, mc_q ) )
1151                                 {
1152                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1153                                                 mc, mc_q );
1154                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1155                                         LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1156                                                 mc, mc_q );
1157                                 }
1158
1159                         } else if ( !LDAP_BACK_USE_TEMPORARIES( mi )
1160                                 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max )
1161                         {
1162                                 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv );
1163                         }
1164
1165
1166                 } else {
1167                         mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1168                                 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1169                 }
1170
1171                 if ( mc ) {
1172                         /* catch taint errors */
1173                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1174
1175                         /* Don't reuse connections while they're still binding
1176                          * NOTE: only makes sense for binds */
1177                         if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1178                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1179                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1180
1181                                         ldap_pvt_thread_yield();
1182                                         goto retry_lock;
1183                                 }
1184
1185                                 /* release conn, and create a temporary */
1186                                 mc = NULL;
1187
1188                         } else {
1189                                 if ( mc->mc_refcnt == 0 && (( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1190                                         || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout )) )
1191                                 {
1192 #if META_BACK_PRINT_CONNTREE > 0
1193                                         meta_back_print_conntree( mi,
1194                                                 ">>> meta_back_getconn(expired)" );
1195 #endif /* META_BACK_PRINT_CONNTREE */
1196
1197                                         /* don't let anyone else use this expired connection */
1198                                         if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1199                                                 if ( mc->mc_q.tqe_prev != NULL ) {
1200                                                         assert( LDAP_BACK_CONN_CACHED( mc ) );
1201                                                         assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1202                                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1203                                                                 mc, mc_q );
1204                                                         mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1205                                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1206
1207                                                 } else {
1208                                                         assert( !LDAP_BACK_CONN_CACHED( mc ) );
1209                                                 }
1210
1211                                         } else {
1212                                                 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1213                                                         (caddr_t)mc, meta_back_conndnmc_cmp );
1214                                         }
1215
1216 #if META_BACK_PRINT_CONNTREE > 0
1217                                         meta_back_print_conntree( mi,
1218                                                 "<<< meta_back_getconn(expired)" );
1219 #endif /* META_BACK_PRINT_CONNTREE */
1220                                         LDAP_BACK_CONN_TAINTED_SET( mc );
1221                                         LDAP_BACK_CONN_CACHED_CLEAR( mc );
1222
1223                                         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1224                                                 char buf[STRLENOF("4294967295U") + 1] = { 0 };
1225                                                 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1226
1227                                                 Debug( LDAP_DEBUG_TRACE,
1228                                                         "%s meta_back_getconn: mc=%p conn=%s expired (tainted).\n",
1229                                                         op->o_log_prefix, (void *)mc, buf );
1230                                         }
1231                                 }
1232
1233                                 mc->mc_refcnt++;
1234                         }
1235                 }
1236                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1237         }
1238
1239         switch ( op->o_tag ) {
1240         case LDAP_REQ_ADD:
1241                 /* if we go to selection, the entry must not exist,
1242                  * and we must be able to resolve the parent */
1243                 dn_type = META_DNTYPE_PARENT;
1244                 dnParent( &ndn, &pndn );
1245                 break;
1246
1247         case LDAP_REQ_MODRDN:
1248                 /* if nnewSuperior is not NULL, it must resolve
1249                  * to the same candidate as the req_ndn */
1250                 if ( op->orr_nnewSup ) {
1251                         dn_type = META_DNTYPE_NEWPARENT;
1252                 }
1253                 break;
1254
1255         case LDAP_REQ_BIND:
1256                 /* if bound as rootdn, the backend must bind to all targets
1257                  * with the administrative identity
1258                  * (unless pseoudoroot-bind-defer is TRUE) */
1259                 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
1260                         op_type = META_OP_REQUIRE_ALL;
1261                 }
1262                 break;
1263
1264         case LDAP_REQ_COMPARE:
1265         case LDAP_REQ_DELETE:
1266         case LDAP_REQ_MODIFY:
1267                 /* just a unique candidate */
1268                 break;
1269
1270         case LDAP_REQ_SEARCH:
1271                 /* allow multiple candidates for the searchBase */
1272                 op_type = META_OP_ALLOW_MULTIPLE;
1273                 break;
1274
1275         default:
1276                 /* right now, just break (exop?) */
1277                 break;
1278         }
1279
1280         /*
1281          * require all connections ...
1282          */
1283         if ( op_type == META_OP_REQUIRE_ALL ) {
1284
1285                 /* Looks like we didn't get a bind. Open a new session... */
1286                 if ( mc == NULL ) {
1287                         assert( new_conn == 0 );
1288                         mc = metaconn_alloc( op );
1289                         mc->mc_conn = mc_curr.mc_conn;
1290                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1291                         new_conn = 1;
1292                         if ( sendok & LDAP_BACK_BINDING ) {
1293                                 LDAP_BACK_CONN_BINDING_SET( mc );
1294                         }
1295                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1296                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1297
1298                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1299                                 LDAP_BACK_CONN_ISANON_SET( mc );
1300                         }
1301
1302                 } else if ( 0 ) {
1303                         /* TODO: if any of the connections is binding,
1304                          * release mc and create a new one */
1305                 }
1306
1307                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1308                         /*
1309                          * The target is activated; if needed, it is
1310                          * also init'd
1311                          */
1312                         candidates[ i ].sr_err = meta_back_init_one_conn( op,
1313                                 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1314                                 LDAP_BACK_DONTSEND, !new_conn );
1315                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1316                                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1317                                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1318                                 }
1319                                 META_CANDIDATE_SET( &candidates[ i ] );
1320                                 ncandidates++;
1321
1322                         } else {
1323
1324                                 /*
1325                                  * FIXME: in case one target cannot
1326                                  * be init'd, should the other ones
1327                                  * be tried?
1328                                  */
1329                                 META_CANDIDATE_RESET( &candidates[ i ] );
1330                                 err = candidates[ i ].sr_err;
1331                                 continue;
1332                         }
1333                 }
1334
1335                 if ( ncandidates == 0 ) {
1336                         if ( new_conn ) {
1337                                 mc->mc_refcnt = 0;
1338                                 meta_back_conn_free( mc );
1339
1340                         } else {
1341                                 meta_back_release_conn( mi, mc );
1342                         }
1343
1344                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
1345                         rs->sr_text = "Unable to select valid candidates";
1346
1347                         if ( sendok & LDAP_BACK_SENDERR ) {
1348                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1349                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1350                                 }
1351                                 send_ldap_result( op, rs );
1352                                 rs->sr_matched = NULL;
1353                         }
1354
1355                         return NULL;
1356                 }
1357
1358                 goto done;
1359         }
1360
1361         /*
1362          * looks in cache, if any
1363          */
1364         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1365                 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1366         }
1367
1368         if ( op_type == META_OP_REQUIRE_SINGLE ) {
1369                 metatarget_t            *mt = NULL;
1370                 metasingleconn_t        *msc = NULL;
1371
1372                 int                     j;
1373
1374                 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1375                         META_CANDIDATE_RESET( &candidates[ j ] );
1376                 }
1377
1378                 /*
1379                  * tries to get a unique candidate
1380                  * (takes care of default target)
1381                  */
1382                 if ( i == META_TARGET_NONE ) {
1383                         i = meta_back_get_candidate( op, rs, &ndn );
1384
1385                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1386                                 i = meta_back_get_candidate( op, rs, &pndn );
1387                         }
1388
1389                         if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1390                                 if ( mc != NULL ) {
1391                                         meta_back_release_conn( mi, mc );
1392                                 }
1393
1394                                 if ( sendok & LDAP_BACK_SENDERR ) {
1395                                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1396                                                 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1397                                         }
1398                                         send_ldap_result( op, rs );
1399                                         rs->sr_matched = NULL;
1400                                 }
1401
1402                                 return NULL;
1403                         }
1404                 }
1405
1406                 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1407                 {
1408                         if ( mc != NULL ) {
1409                                 meta_back_release_conn( mi, mc );
1410                         }
1411
1412                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1413                         rs->sr_text = "Cross-target rename not supported";
1414                         if ( sendok & LDAP_BACK_SENDERR ) {
1415                                 send_ldap_result( op, rs );
1416                         }
1417
1418                         return NULL;
1419                 }
1420
1421                 Debug( LDAP_DEBUG_TRACE,
1422         "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1423                                 i, op->o_req_ndn.bv_val, 0 );
1424
1425                 if ( mc == NULL ) {
1426                         /* Retries searching for a metaconn in the avl tree
1427                          * the reason is that the connection might have been
1428                          * created by meta_back_get_candidate() */
1429                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
1430 retry_lock2:;
1431                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1432                                 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1433                                         (caddr_t)&mc_curr, meta_back_conndn_cmp );
1434                                 if ( mc != NULL ) {
1435                                         /* catch taint errors */
1436                                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1437
1438                                         /* Don't reuse connections while they're still binding */
1439                                         if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] )
1440                                                 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) )
1441                                         {
1442                                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1443                                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1444                                                         ldap_pvt_thread_yield();
1445                                                         goto retry_lock2;
1446                                                 }
1447
1448                                                 mc = NULL;
1449
1450                                         } else {
1451                                                 mc->mc_refcnt++;
1452                                         }
1453                                 }
1454                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1455                         }
1456
1457                         /* Looks like we didn't get a bind. Open a new session... */
1458                         if ( mc == NULL ) {
1459                                 assert( new_conn == 0 );
1460                                 mc = metaconn_alloc( op );
1461                                 mc->mc_conn = mc_curr.mc_conn;
1462                                 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1463                                 new_conn = 1;
1464                                 if ( sendok & LDAP_BACK_BINDING ) {
1465                                         LDAP_BACK_CONN_BINDING_SET( mc );
1466                                 }
1467                                 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1468                                         LDAP_BACK_CONN_ISPRIV_SET( mc );
1469
1470                                 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1471                                         LDAP_BACK_CONN_ISANON_SET( mc );
1472                                 }
1473                         }
1474                 }
1475
1476                 /*
1477                  * Clear all other candidates
1478                  */
1479                 ( void )meta_clear_unused_candidates( op, i );
1480
1481                 mt = mi->mi_targets[ i ];
1482                 msc = &mc->mc_conns[ i ];
1483
1484                 /*
1485                  * The target is activated; if needed, it is
1486                  * also init'd. In case of error, meta_back_init_one_conn
1487                  * sends the appropriate result.
1488                  */
1489                 err = meta_back_init_one_conn( op, rs, mc, i,
1490                         LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn );
1491                 if ( err != LDAP_SUCCESS ) {
1492                         /*
1493                          * FIXME: in case one target cannot
1494                          * be init'd, should the other ones
1495                          * be tried?
1496                          */
1497                         META_CANDIDATE_RESET( &candidates[ i ] );
1498                         if ( new_conn ) {
1499                                 mc->mc_refcnt = 0;
1500                                 meta_back_conn_free( mc );
1501
1502                         } else {
1503                                 meta_back_release_conn( mi, mc );
1504                         }
1505                         return NULL;
1506                 }
1507
1508                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1509                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1510                 }
1511
1512                 candidates[ i ].sr_err = LDAP_SUCCESS;
1513                 META_CANDIDATE_SET( &candidates[ i ] );
1514                 ncandidates++;
1515
1516                 if ( candidate ) {
1517                         *candidate = i;
1518                 }
1519
1520         /*
1521          * if no unique candidate ...
1522          */
1523         } else {
1524
1525                 /* Looks like we didn't get a bind. Open a new session... */
1526                 if ( mc == NULL ) {
1527                         assert( new_conn == 0 );
1528                         mc = metaconn_alloc( op );
1529                         mc->mc_conn = mc_curr.mc_conn;
1530                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1531                         new_conn = 1;
1532                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1533                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1534
1535                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1536                                 LDAP_BACK_CONN_ISANON_SET( mc );
1537                         }
1538                 }
1539
1540                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1541                         metatarget_t            *mt = mi->mi_targets[ i ];
1542
1543                         META_CANDIDATE_RESET( &candidates[ i ] );
1544
1545                         if ( i == cached
1546                                 || meta_back_is_candidate( mt, &op->o_req_ndn,
1547                                         op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_SUBTREE ) )
1548                         {
1549
1550                                 /*
1551                                  * The target is activated; if needed, it is
1552                                  * also init'd
1553                                  */
1554                                 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1555                                         LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1556                                         LDAP_BACK_DONTSEND, !new_conn );
1557                                 candidates[ i ].sr_err = lerr;
1558                                 if ( lerr == LDAP_SUCCESS ) {
1559                                         META_CANDIDATE_SET( &candidates[ i ] );
1560                                         ncandidates++;
1561
1562                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1563                                                 op->o_log_prefix, i, 0 );
1564
1565                                 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1566                                         META_CANDIDATE_SET( &candidates[ i ] );
1567
1568                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1569                                                 op->o_log_prefix, i,
1570                                                 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1571
1572                                 } else {
1573
1574                                         /*
1575                                          * FIXME: in case one target cannot
1576                                          * be init'd, should the other ones
1577                                          * be tried?
1578                                          */
1579                                         if ( new_conn ) {
1580                                                 ( void )meta_clear_one_candidate( op, mc, i );
1581                                         }
1582                                         /* leave the target candidate, but record the error for later use */
1583                                         err = lerr;
1584
1585                                         if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1586                                                 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined err=%d\n",
1587                                                         op->o_log_prefix, i, lerr );
1588
1589                                         } else {
1590                                                 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed err=%d\n",
1591                                                         op->o_log_prefix, i, lerr );
1592                                         }
1593
1594                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1595                                                 if ( sendok & LDAP_BACK_SENDERR ) {
1596                                                         send_ldap_result( op, rs );
1597                                                 }
1598                                                 if ( new_conn ) {
1599                                                         mc->mc_refcnt = 0;
1600                                                         meta_back_conn_free( mc );
1601
1602                                                 } else {
1603                                                         meta_back_release_conn( mi, mc );
1604                                                 }
1605
1606                                                 return NULL;
1607                                         }
1608
1609                                         continue;
1610                                 }
1611
1612                         } else {
1613                                 if ( new_conn ) {
1614                                         ( void )meta_clear_one_candidate( op, mc, i );
1615                                 }
1616                         }
1617                 }
1618
1619                 if ( ncandidates == 0 ) {
1620                         if ( new_conn ) {
1621                                 mc->mc_refcnt = 0;
1622                                 meta_back_conn_free( mc );
1623
1624                         } else {
1625                                 meta_back_release_conn( mi, mc );
1626                         }
1627
1628                         if ( rs->sr_err == LDAP_SUCCESS ) {
1629                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1630                                 rs->sr_text = "Unable to select valid candidates";
1631                         }
1632
1633                         if ( sendok & LDAP_BACK_SENDERR ) {
1634                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1635                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1636                                 }
1637                                 send_ldap_result( op, rs );
1638                                 rs->sr_matched = NULL;
1639                         }
1640
1641                         return NULL;
1642                 }
1643         }
1644
1645 done:;
1646         /* clear out meta_back_init_one_conn non-fatal errors */
1647         rs->sr_err = LDAP_SUCCESS;
1648         rs->sr_text = NULL;
1649
1650         /* touch the timestamp */
1651         if ( mi->mi_idle_timeout != 0 ) {
1652                 mc->mc_time = op->o_time;
1653         }
1654
1655         if ( new_conn ) {
1656                 if ( mi->mi_conn_ttl ) {
1657                         mc->mc_create_time = op->o_time;
1658                 }
1659
1660                 /*
1661                  * Inserts the newly created metaconn in the avl tree
1662                  */
1663                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1664 #if META_BACK_PRINT_CONNTREE > 0
1665                 meta_back_print_conntree( mi, ">>> meta_back_getconn" );
1666 #endif /* META_BACK_PRINT_CONNTREE */
1667
1668                 err = 0;
1669                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1670                         if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) {
1671                                 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1672                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++;
1673                                 LDAP_BACK_CONN_CACHED_SET( mc );
1674
1675                         } else {
1676                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1677                         }
1678                         rs->sr_err = 0;
1679
1680                 } else if ( !( sendok & LDAP_BACK_BINDING ) ) {
1681                         err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1682                                 meta_back_conndn_cmp, meta_back_conndn_dup );
1683                         LDAP_BACK_CONN_CACHED_SET( mc );
1684                 }
1685
1686 #if META_BACK_PRINT_CONNTREE > 0
1687                 meta_back_print_conntree( mi, "<<< meta_back_getconn" );
1688 #endif /* META_BACK_PRINT_CONNTREE */
1689                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1690
1691                 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1692                         /*
1693                          * Err could be -1 in case a duplicate metaconn is inserted
1694                          */
1695                         switch ( err ) {
1696                         case 0:
1697                                 break;
1698
1699                         case -1:
1700                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1701                                 /* duplicate: free and try to get the newly created one */
1702                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1703                                         mc->mc_refcnt = 0;
1704                                         meta_back_conn_free( mc );
1705
1706                                         new_conn = 0;
1707                                         goto retry_lock;
1708                                 }
1709
1710                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1711                                 break;
1712
1713                         default:
1714                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1715                                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
1716                                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1717                                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1718
1719                                         Debug( LDAP_DEBUG_ANY,
1720                                                 "%s meta_back_getconn: candidates=%d conn=%s insert failed\n",
1721                                                 op->o_log_prefix, ncandidates, buf );
1722                                 }
1723
1724                                 mc->mc_refcnt = 0;
1725                                 meta_back_conn_free( mc );
1726
1727                                 rs->sr_err = LDAP_OTHER;
1728                                 rs->sr_text = "Proxy bind collision";
1729                                 if ( sendok & LDAP_BACK_SENDERR ) {
1730                                         send_ldap_result( op, rs );
1731                                 }
1732                                 return NULL;
1733                         }
1734                 }
1735
1736                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1737                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1738                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1739
1740                         Debug( LDAP_DEBUG_TRACE,
1741                                 "%s meta_back_getconn: candidates=%d conn=%s inserted\n",
1742                                 op->o_log_prefix, ncandidates, buf );
1743                 }
1744
1745         } else {
1746                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1747                         char buf[STRLENOF("4294967295U") + 1] = { 0 };
1748                         mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) );
1749
1750                         Debug( LDAP_DEBUG_TRACE,
1751                                 "%s meta_back_getconn: candidates=%d conn=%s fetched\n",
1752                                 op->o_log_prefix, ncandidates, buf );
1753                 }
1754         }
1755
1756         return mc;
1757 }
1758
1759 void
1760 meta_back_release_conn_lock(
1761         metainfo_t              *mi,
1762         metaconn_t              *mc,
1763         int                     dolock )
1764 {
1765         assert( mc != NULL );
1766
1767         if ( dolock ) {
1768                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1769         }
1770         assert( mc->mc_refcnt > 0 );
1771         mc->mc_refcnt--;
1772         /* NOTE: the connection is removed if either it is tainted
1773          * or if it is shared and no one else is using it.  This needs
1774          * to occur because for intrinsic reasons cached connections
1775          * that are not privileged would live forever and pollute
1776          * the connection space (and eat up resources).  Maybe this
1777          * should be configurable... */
1778         if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) {
1779 #if META_BACK_PRINT_CONNTREE > 0
1780                 meta_back_print_conntree( mi, ">>> meta_back_release_conn" );
1781 #endif /* META_BACK_PRINT_CONNTREE */
1782
1783                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1784                         if ( mc->mc_q.tqe_prev != NULL ) {
1785                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
1786                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1787                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1788                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1789                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1790
1791                         } else {
1792                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1793                         }
1794
1795                 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) {
1796                         metaconn_t      *tmpmc;
1797
1798                         tmpmc = avl_delete( &mi->mi_conninfo.lai_tree,
1799                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
1800
1801                         /* Overparanoid, but useful... */
1802                         assert( tmpmc == NULL || tmpmc == mc );
1803                 }
1804
1805                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1806
1807 #if META_BACK_PRINT_CONNTREE > 0
1808                 meta_back_print_conntree( mi, "<<< meta_back_release_conn" );
1809 #endif /* META_BACK_PRINT_CONNTREE */
1810
1811                 if ( mc->mc_refcnt == 0 ) {
1812                         meta_back_conn_free( mc );
1813                         mc = NULL;
1814                 }
1815         }
1816
1817         if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) {
1818                 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1819         }
1820
1821         if ( dolock ) {
1822                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1823         }
1824 }
1825
1826 void
1827 meta_back_quarantine(
1828         Operation       *op,
1829         SlapReply       *rs,
1830         int             candidate )
1831 {
1832         metainfo_t              *mi = (metainfo_t *)op->o_bd->be_private;
1833         metatarget_t            *mt = mi->mi_targets[ candidate ];
1834
1835         slap_retry_info_t       *ri = &mt->mt_quarantine;
1836
1837         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1838
1839         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1840                 time_t  new_last = slap_get_time();
1841
1842                 switch ( mt->mt_isquarantined ) {
1843                 case LDAP_BACK_FQ_NO:
1844                         if ( ri->ri_last == new_last ) {
1845                                 goto done;
1846                         }
1847
1848                         Debug( LDAP_DEBUG_ANY,
1849                                 "%s meta_back_quarantine[%d]: enter.\n",
1850                                 op->o_log_prefix, candidate, 0 );
1851
1852                         ri->ri_idx = 0;
1853                         ri->ri_count = 0;
1854                         break;
1855
1856                 case LDAP_BACK_FQ_RETRYING:
1857                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
1858                                 char    buf[ SLAP_TEXT_BUFLEN ];
1859
1860                                 snprintf( buf, sizeof( buf ),
1861                                         "meta_back_quarantine[%d]: block #%d try #%d failed",
1862                                         candidate, ri->ri_idx, ri->ri_count );
1863                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1864                                         op->o_log_prefix, buf, 0 );
1865                         }
1866
1867                         ++ri->ri_count;
1868                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1869                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1870                         {
1871                                 ri->ri_count = 0;
1872                                 ++ri->ri_idx;
1873                         }
1874                         break;
1875
1876                 default:
1877                         break;
1878                 }
1879
1880                 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1881                 ri->ri_last = new_last;
1882
1883         } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1884                 Debug( LDAP_DEBUG_ANY,
1885                         "%s meta_back_quarantine[%d]: exit.\n",
1886                         op->o_log_prefix, candidate, 0 );
1887
1888                 if ( mi->mi_quarantine_f ) {
1889                         (void)mi->mi_quarantine_f( mi, candidate,
1890                                 mi->mi_quarantine_p );
1891                 }
1892
1893                 ri->ri_count = 0;
1894                 ri->ri_idx = 0;
1895                 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1896         }
1897
1898 done:;
1899         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
1900 }