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 1999-2008 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 = 1;
 293
 294                 if ( mt->mt_quarantine.ri_interval ) {
 295                         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
 296                         if ( mt->mt_isquarantined == LDAP_BACK_FQ_YES ) {
 297                                 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 298                                         || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 299                                 if ( !dont_retry ) {
 300                                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
 301                                                 char    buf[ SLAP_TEXT_BUFLEN ];
 302
 303                                                 snprintf( buf, sizeof( buf ),
 304                                                         "meta_back_init_one_conn[%d]: quarantine "
 305                                                         "retry block #%d try #%d",
 306                                                         candidate, ri->ri_idx, ri->ri_count );
 307                                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
 308                                                         op->o_log_prefix, buf, 0 );
 309                                         }
 310                                 }
 311
 312                                 mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING;
 313                         }
 314                         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
 315                 }
 316
 317                 if ( dont_retry ) {
 318                         rs->sr_err = LDAP_UNAVAILABLE;
 319                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 320                                 rs->sr_text = "Target is quarantined";
 321                                 send_ldap_result( op, rs );
 322                         }
 323                         return rs->sr_err;
 324                 }
 325         }
 326
 327 retry_lock:;
 328         if ( dolock ) {
 329                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 330         }
 331
 332         /*
 333          * Already init'ed
 334          */
 335         if ( LDAP_BACK_CONN_ISBOUND( msc )
 336                 || LDAP_BACK_CONN_ISANON( msc ) )
 337         {
 338                 assert( msc->msc_ld != NULL );
 339                 rs->sr_err = LDAP_SUCCESS;
 340                 do_return = 1;
 341
 342         } else if ( META_BACK_CONN_CREATING( msc )
 343                 || LDAP_BACK_CONN_BINDING( msc ) )
 344         {
 345                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
 346                         if ( dolock ) {
 347                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 348                         }
 349
 350                         ldap_pvt_thread_yield();
 351                         goto retry_lock;
 352                 }
 353
 354                 /* sounds more appropriate */
 355                 rs->sr_err = LDAP_BUSY;
 356                 rs->sr_text = "No connections to target are available";
 357                 do_return = 1;
 358
 359         } else if ( META_BACK_CONN_INITED( msc ) ) {
 360                 assert( msc->msc_ld != NULL );
 361                 rs->sr_err = LDAP_SUCCESS;
 362                 do_return = 1;
 363
 364         } else {
 365                 /*
 366                  * creating...
 367                  */
 368                 META_BACK_CONN_CREATING_SET( msc );
 369         }
 370
 371         if ( dolock ) {
 372                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 373         }
 374
 375         if ( do_return ) {
 376                 if ( rs->sr_err != LDAP_SUCCESS
 377                         && op->o_conn
 378                         && ( sendok & LDAP_BACK_SENDERR ) )
 379                 {
 380                         send_ldap_result( op, rs );
 381                 }
 382
 383                 return rs->sr_err;
 384         }
 385
 386         assert( msc->msc_ld == NULL );
 387
 388         /*
 389          * Attempts to initialize the connection to the target ds
 390          */
 391         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 392         rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
 393 #ifdef HAVE_TLS
 394         is_ldaps = ldap_is_ldaps_url( mt->mt_uri );
 395 #endif /* HAVE_TLS */
 396         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 397         if ( rs->sr_err != LDAP_SUCCESS ) {
 398                 goto error_return;
 399         }
 400
 401         /*
 402          * Set LDAP version. This will always succeed: If the client
 403          * bound with a particular version, then so can we.
 404          */
 405         if ( mt->mt_version != 0 ) {
 406                 version = mt->mt_version;
 407
 408         } else if ( op->o_conn->c_protocol != 0 ) {
 409                 version = op->o_conn->c_protocol;
 410
 411         } else {
 412                 version = LDAP_VERSION3;
 413         }
 414         ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version );
 415         ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p );
 416
 417         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 418         ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
 419                 LDAP_BACK_CHASE_REFERRALS( mi ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 420
 421 #ifdef HAVE_TLS
 422         /* start TLS ("tls [try-]{start|propagate}" statement) */
 423         if ( ( LDAP_BACK_USE_TLS( mi )
 424                 || ( op->o_conn->c_is_tls
 425                         && LDAP_BACK_PROPAGATE_TLS( mi ) ) )
 426                 && !is_ldaps )
 427         {
 428 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 429                 /*
 430                  * use asynchronous StartTLS; in case, chase referral
 431                  * FIXME: OpenLDAP does not return referral on StartTLS yet
 432                  */
 433                 int             msgid;
 434
 435                 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid );
 436                 if ( rs->sr_err == LDAP_SUCCESS ) {
 437                         LDAPMessage     *res = NULL;
 438                         int             rc, nretries = mt->mt_nretries;
 439                         struct timeval  tv;
 440
 441                         LDAP_BACK_TV_SET( &tv );
 442
 443 retry:;
 444                         rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 445                         switch ( rc ) {
 446                         case -1:
 447                                 rs->sr_err = LDAP_OTHER;
 448                                 break;
 449
 450                         case 0:
 451                                 if ( nretries != 0 ) {
 452                                         if ( nretries > 0 ) {
 453                                                 nretries--;
 454                                         }
 455                                         LDAP_BACK_TV_SET( &tv );
 456                                         goto retry;
 457                                 }
 458                                 rs->sr_err = LDAP_OTHER;
 459                                 break;
 460
 461                         default:
 462                                 /* only touch when activity actually took place... */
 463                                 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
 464                                         msc->msc_time = op->o_time;
 465                                 }
 466                                 break;
 467                         }
 468
 469                         if ( rc == LDAP_RES_EXTENDED ) {
 470                                 struct berval   *data = NULL;
 471
 472                                 /* NOTE: right now, data is unused, so don't get it */
 473                                 rs->sr_err = ldap_parse_extended_result( msc->msc_ld,
 474                                         res, NULL, NULL /* &data */ , 0 );
 475                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 476                                         int             err;
 477
 478                                         /* FIXME: matched? referrals? response controls? */
 479                                         rs->sr_err = ldap_parse_result( msc->msc_ld,
 480                                                 res, &err, NULL, NULL, NULL, NULL, 1 );
 481                                         res = NULL;
 482
 483                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 484                                                 rs->sr_err = err;
 485                                         }
 486
 487                                         /* FIXME: in case a referral
 488                                          * is returned, should we try
 489                                          * using it instead of the
 490                                          * configured URI? */
 491                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 492                                                 ldap_install_tls( msc->msc_ld );
 493
 494                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 495                                                 /* FIXME: LDAP_OPERATIONS_ERROR? */
 496                                                 rs->sr_err = LDAP_OTHER;
 497                                                 rs->sr_text = "Unwilling to chase referral "
 498                                                         "returned by Start TLS exop";
 499                                         }
 500
 501                                         if ( data ) {
 502                                                 ber_bvfree( data );
 503                                         }
 504                                 }
 505
 506                         } else {
 507                                 rs->sr_err = LDAP_OTHER;
 508                         }
 509
 510                         if ( res != NULL ) {
 511                                 ldap_msgfree( res );
 512                         }
 513                 }
 514 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 515                 /*
 516                  * use synchronous StartTLS
 517                  */
 518                 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL );
 519 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 520
 521                 /* if StartTLS is requested, only attempt it if the URL
 522                  * is not "ldaps://"; this may occur not only in case
 523                  * of misconfiguration, but also when used in the chain
 524                  * overlay, where the "uri" can be parsed out of a referral */
 525                 if ( rs->sr_err == LDAP_SERVER_DOWN
 526                         || ( rs->sr_err != LDAP_SUCCESS
 527                                 && LDAP_BACK_TLS_CRITICAL( mi ) ) )
 528                 {
 529
 530 #ifdef DEBUG_205
 531                         Debug( LDAP_DEBUG_ANY,
 532                                 "### %s meta_back_init_one_conn(TLS) "
 533                                 "ldap_unbind_ext[%d] ld=%p\n",
 534                                 op->o_log_prefix, candidate,
 535                                 (void *)msc->msc_ld );
 536 #endif /* DEBUG_205 */
 537
 538                         /* need to trash a failed Start TLS */
 539                         meta_clear_one_candidate( op, mc, candidate );
 540                         goto error_return;
 541                 }
 542         }
 543 #endif /* HAVE_TLS */
 544
 545         /*
 546          * Set the network timeout if set
 547          */
 548         if ( mt->mt_network_timeout != 0 ) {
 549                 struct timeval  network_timeout;
 550
 551                 network_timeout.tv_usec = 0;
 552                 network_timeout.tv_sec = mt->mt_network_timeout;
 553
 554                 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
 555                                 (void *)&network_timeout );
 556         }
 557
 558         /*
 559          * If the connection DN is not null, an attempt to rewrite it is made
 560          */
 561
 562         if ( ispriv ) {
 563                 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) {
 564                         ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN );
 565                         if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) {
 566                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 567                                         memset( msc->msc_cred.bv_val, 0,
 568                                                 msc->msc_cred.bv_len );
 569                                 }
 570                                 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd );
 571                         }
 572
 573                 } else {
 574                         ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv );
 575                 }
 576
 577         } else {
 578                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 579                         memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 580                         ber_memfree_x( msc->msc_cred.bv_val, NULL );
 581                         BER_BVZERO( &msc->msc_cred );
 582                 }
 583                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 584                         ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL );
 585                         BER_BVZERO( &msc->msc_bound_ndn );
 586                 }
 587                 if ( !BER_BVISEMPTY( &op->o_ndn )
 588                         && SLAP_IS_AUTHZ_BACKEND( op )
 589                         && isauthz )
 590                 {
 591                         dc.target = mt;
 592                         dc.conn = op->o_conn;
 593                         dc.rs = rs;
 594                         dc.ctx = "bindDN";
 595
 596                         /*
 597                          * Rewrite the bind dn if needed
 598                          */
 599                         if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn,
 600                                                 &msc->msc_bound_ndn ) )
 601                         {
 602
 603 #ifdef DEBUG_205
 604                                 Debug( LDAP_DEBUG_ANY,
 605                                         "### %s meta_back_init_one_conn(rewrite) "
 606                                         "ldap_unbind_ext[%d] ld=%p\n",
 607                                         op->o_log_prefix, candidate,
 608                                         (void *)msc->msc_ld );
 609 #endif /* DEBUG_205 */
 610
 611                                 /* need to trash a connection not fully established */
 612                                 meta_clear_one_candidate( op, mc, candidate );
 613                                 goto error_return;
 614                         }
 615
 616                         /* copy the DN if needed */
 617                         if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) {
 618                                 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn );
 619                         }
 620
 621                         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 622
 623                 } else {
 624                         ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv );
 625                 }
 626         }
 627
 628         assert( !BER_BVISNULL( &msc->msc_bound_ndn ) );
 629
 630 error_return:;
 631         if ( dolock ) {
 632                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 633         }
 634         META_BACK_CONN_CREATING_CLEAR( msc );
 635         if ( rs->sr_err == LDAP_SUCCESS ) {
 636                 /*
 637                  * Sets a cookie for the rewrite session
 638                  */
 639                 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
 640                 META_BACK_CONN_INITED_SET( msc );
 641         }
 642         if ( dolock ) {
 643                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 644         }
 645
 646         if ( rs->sr_err != LDAP_SUCCESS ) {
 647                 rs->sr_err = slap_map_api2result( rs );
 648                 if ( sendok & LDAP_BACK_SENDERR ) {
 649                         send_ldap_result( op, rs );
 650                 }
 651         }
 652
 653         return rs->sr_err;
 654 }
 655
 656 /*
 657  * meta_back_retry
 658  *
 659  * Retries one connection
 660  */
 661 int
 662 meta_back_retry(
 663         Operation               *op,
 664         SlapReply               *rs,
 665         metaconn_t              **mcp,
 666         int                     candidate,
 667         ldap_back_send_t        sendok )
 668 {
 669         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 670         metatarget_t            *mt = mi->mi_targets[ candidate ];
 671         metaconn_t              *mc = *mcp;
 672         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 673         int                     rc = LDAP_UNAVAILABLE,
 674                                 binding,
 675                                 quarantine = 1;
 676
 677         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 678
 679         assert( !META_BACK_CONN_CREATING( msc ) );
 680         binding = LDAP_BACK_CONN_BINDING( msc );
 681         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 682
 683         assert( mc->mc_refcnt > 0 );
 684         if ( mc->mc_refcnt == 1 ) {
 685                 if ( LogTest( LDAP_DEBUG_ANY ) ) {
 686                         char    buf[ SLAP_TEXT_BUFLEN ];
 687
 688                         /* this lock is required; however,
 689                          * it's invoked only when logging is on */
 690                         ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 691                         snprintf( buf, sizeof( buf ),
 692                                 "retrying URI=\"%s\" DN=\"%s\"",
 693                                 mt->mt_uri,
 694                                 BER_BVISNULL( &msc->msc_bound_ndn ) ?
 695                                         "" : msc->msc_bound_ndn.bv_val );
 696                         ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 697
 698                         Debug( LDAP_DEBUG_ANY,
 699                                 "%s meta_back_retry[%d]: %s.\n",
 700                                 op->o_log_prefix, candidate, buf );
 701                 }
 702
 703                 meta_clear_one_candidate( op, mc, candidate );
 704                 LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 705
 706                 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 707
 708                 /* mc here must be the regular mc, reset and ready for init */
 709                 rc = meta_back_init_one_conn( op, rs, mc, candidate,
 710                         LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 );
 711
 712                 /* restore the "binding" flag, in case */
 713                 if ( binding ) {
 714                         LDAP_BACK_CONN_BINDING_SET( msc );
 715                 }
 716
 717                 if ( rc == LDAP_SUCCESS ) {
 718                         quarantine = 0;
 719                         rc = meta_back_single_dobind( op, rs, mcp, candidate,
 720                                 sendok, mt->mt_nretries, 0 );
 721
 722                         Debug( LDAP_DEBUG_ANY,
 723                                 "%s meta_back_retry[%d]: "
 724                                 "meta_back_single_dobind=%d\n",
 725                                 op->o_log_prefix, candidate, rc );
 726                         if ( rc == LDAP_SUCCESS ) {
 727                                 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) &&
 728                                         !BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 729                                 {
 730                                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 731
 732                                 } else {
 733                                         LDAP_BACK_CONN_ISANON_SET( msc );
 734                                 }
 735
 736                                 /* when bound, dispose of the "binding" flag */
 737                                 if ( binding ) {
 738                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 739                                 }
 740                         }
 741                 }
 742
 743                 /* don't send twice */
 744                 sendok &= ~LDAP_BACK_SENDERR;
 745         }
 746
 747         if ( rc != LDAP_SUCCESS ) {
 748                 SlapReply               *candidates = meta_back_candidates_get( op );
 749
 750                 candidates[ candidate ].sr_err = rc;
 751
 752                 if ( *mcp != NULL ) {
 753                         if ( mc->mc_refcnt == 1 ) {
 754                                 if ( binding ) {
 755                                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 756                                 }
 757                                 (void)meta_clear_one_candidate( op, mc, candidate );
 758                         }
 759
 760                         LDAP_BACK_CONN_TAINTED_SET( mc );
 761                         /* only release if mandatory; otherwise
 762                          * let the caller do what's best before
 763                          * releasing */
 764                         if ( META_BACK_ONERR_STOP( mi ) ) {
 765                                 meta_back_release_conn_lock( mi, mc, 0 );
 766                                 *mcp = NULL;
 767
 768                         } else {
 769 #if META_BACK_PRINT_CONNTREE > 0
 770                                 meta_back_print_conntree( mi, ">>> meta_back_retry" );
 771 #endif /* META_BACK_PRINT_CONNTREE */
 772
 773                                 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */
 774                                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
 775                                         if ( mc->mc_q.tqe_prev != NULL ) {
 776                                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
 777                                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
 778                                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
 779                                                         mc, mc_q );
 780                                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
 781                                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
 782
 783                                         } else {
 784                                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
 785                                         }
 786
 787                                 } else {
 788                                         /* FIXME: check if in tree, for consistency? */
 789                                         (void)avl_delete( &mi->mi_conninfo.lai_tree,
 790                                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
 791                                 }
 792                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
 793
 794 #if META_BACK_PRINT_CONNTREE > 0
 795                                 meta_back_print_conntree( mi, "<<< meta_back_retry" );
 796 #endif /* META_BACK_PRINT_CONNTREE */
 797                         }
 798                 }
 799
 800                 if ( sendok & LDAP_BACK_SENDERR ) {
 801                         rs->sr_err = rc;
 802                         rs->sr_text = "Unable to retry";
 803                         send_ldap_result( op, rs );
 804                 }
 805         }
 806
 807         if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) {
 808                 meta_back_quarantine( op, rs, candidate );
 809         }
 810
 811         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 812
 813         return rc == LDAP_SUCCESS ? 1 : 0;
 814 }
 815
 816 /*
 817  * callback for unique candidate selection
 818  */
 819 static int
 820 meta_back_conn_cb( Operation *op, SlapReply *rs )
 821 {
 822         assert( op->o_tag == LDAP_REQ_SEARCH );
 823
 824         switch ( rs->sr_type ) {
 825         case REP_SEARCH:
 826                 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private;
 827                 break;
 828
 829         case REP_SEARCHREF:
 830         case REP_RESULT:
 831                 break;
 832
 833         default:
 834                 return rs->sr_err;
 835         }
 836
 837         return 0;
 838 }
 839
 840
 841 static int
 842 meta_back_get_candidate(
 843         Operation       *op,
 844         SlapReply       *rs,
 845         struct berval   *ndn )
 846 {
 847         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 848         long            candidate;
 849
 850         /*
 851          * tries to get a unique candidate
 852          * (takes care of default target)
 853          */
 854         candidate = meta_back_select_unique_candidate( mi, ndn );
 855
 856         /*
 857          * if any is found, inits the connection
 858          */
 859         if ( candidate == META_TARGET_NONE ) {
 860                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 861                 rs->sr_text = "No suitable candidate target found";
 862
 863         } else if ( candidate == META_TARGET_MULTIPLE ) {
 864                 Operation       op2 = *op;
 865                 SlapReply       rs2 = { 0 };
 866                 slap_callback   cb2 = { 0 };
 867                 int             rc;
 868
 869                 /* try to get a unique match for the request ndn
 870                  * among the multiple candidates available */
 871                 op2.o_tag = LDAP_REQ_SEARCH;
 872                 op2.o_req_dn = *ndn;
 873                 op2.o_req_ndn = *ndn;
 874                 op2.ors_scope = LDAP_SCOPE_BASE;
 875                 op2.ors_deref = LDAP_DEREF_NEVER;
 876                 op2.ors_attrs = slap_anlist_no_attrs;
 877                 op2.ors_attrsonly = 0;
 878                 op2.ors_limit = NULL;
 879                 op2.ors_slimit = 1;
 880                 op2.ors_tlimit = SLAP_NO_LIMIT;
 881
 882                 op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
 883                 op2.ors_filterstr = *slap_filterstr_objectClass_pres;
 884
 885                 op2.o_callback = &cb2;
 886                 cb2.sc_response = meta_back_conn_cb;
 887                 cb2.sc_private = (void *)&candidate;
 888
 889                 rc = op->o_bd->be_search( &op2, &rs2 );
 890
 891                 switch ( rs2.sr_err ) {
 892                 case LDAP_SUCCESS:
 893                 default:
 894                         rs->sr_err = rs2.sr_err;
 895                         break;
 896
 897                 case LDAP_SIZELIMIT_EXCEEDED:
 898                         /* if multiple candidates can serve the operation,
 899                          * and a default target is defined, and it is
 900                          * a candidate, try using it (FIXME: YMMV) */
 901                         if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE
 902                                 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ],
 903                                                 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) )
 904                         {
 905                                 candidate = mi->mi_defaulttarget;
 906                                 rs->sr_err = LDAP_SUCCESS;
 907                                 rs->sr_text = NULL;
 908
 909                         } else {
 910                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 911                                 rs->sr_text = "Unable to select unique candidate target";
 912                         }
 913                         break;
 914                 }
 915
 916         } else {
 917                 rs->sr_err = LDAP_SUCCESS;
 918         }
 919
 920         return candidate;
 921 }
 922
 923 static void     *meta_back_candidates_dummy;
 924
 925 static void
 926 meta_back_candidates_keyfree(
 927         void            *key,
 928         void            *data )
 929 {
 930         metacandidates_t        *mc = (metacandidates_t *)data;
 931
 932         ber_memfree_x( mc->mc_candidates, NULL );
 933         ber_memfree_x( data, NULL );
 934 }
 935
 936 SlapReply *
 937 meta_back_candidates_get( Operation *op )
 938 {
 939         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 940         metacandidates_t        *mc;
 941
 942         if ( op->o_threadctx ) {
 943                 void            *data = NULL;
 944
 945                 ldap_pvt_thread_pool_getkey( op->o_threadctx,
 946                                 &meta_back_candidates_dummy, &data, NULL );
 947                 mc = (metacandidates_t *)data;
 948
 949         } else {
 950                 mc = mi->mi_candidates;
 951         }
 952
 953         if ( mc == NULL ) {
 954                 mc = ch_calloc( sizeof( metacandidates_t ), 1 );
 955                 mc->mc_ntargets = mi->mi_ntargets;
 956                 mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets );
 957                 if ( op->o_threadctx ) {
 958                         void            *data = NULL;
 959
 960                         data = (void *)mc;
 961                         ldap_pvt_thread_pool_setkey( op->o_threadctx,
 962                                         &meta_back_candidates_dummy, data,
 963                                         meta_back_candidates_keyfree,
 964                                         NULL, NULL );
 965
 966                 } else {
 967                         mi->mi_candidates = mc;
 968                 }
 969
 970         } else if ( mc->mc_ntargets < mi->mi_ntargets ) {
 971                 /* NOTE: in the future, may want to allow back-config
 972                  * to add/remove targets from back-meta... */
 973                 mc->mc_candidates = ch_realloc( mc->mc_candidates,
 974                                 sizeof( SlapReply ) * mi->mi_ntargets );
 975                 memset( &mc->mc_candidates[ mc->mc_ntargets ], 0,
 976                         sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) );
 977                 mc->mc_ntargets = mi->mi_ntargets;
 978         }
 979
 980         return mc->mc_candidates;
 981 }
 982
 983 /*
 984  * meta_back_getconn
 985  *
 986  * Prepares the connection structure
 987  *
 988  * RATIONALE:
 989  *
 990  * - determine what DN is being requested:
 991  *
 992  *      op      requires candidate      checks
 993  *
 994  *      add     unique                  parent of o_req_ndn
 995  *      bind    unique^*[/all]          o_req_ndn [no check]
 996  *      compare unique^+                o_req_ndn
 997  *      delete  unique                  o_req_ndn
 998  *      modify  unique                  o_req_ndn
 999  *      search  any                     o_req_ndn
1000  *      modrdn  unique[, unique]        o_req_ndn[, orr_nnewSup]
1001  *
1002  * - for ops that require the candidate to be unique, in case of multiple
1003  *   occurrences an internal search with sizeLimit=1 is performed
1004  *   if a unique candidate can actually be determined.  If none is found,
1005  *   the operation aborts; if multiple are found, the default target
1006  *   is used if defined and candidate; otherwise the operation aborts.
1007  *
1008  * *^note: actually, the bind operation is handled much like a search;
1009  *   i.e. the bind is broadcast to all candidate targets.
1010  *
1011  * +^note: actually, the compare operation is handled much like a search;
1012  *   i.e. the compare is broadcast to all candidate targets, while checking
1013  *   that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is
1014  *   returned.
1015  */
1016 metaconn_t *
1017 meta_back_getconn(
1018         Operation               *op,
1019         SlapReply               *rs,
1020         int                     *candidate,
1021         ldap_back_send_t        sendok )
1022 {
1023         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
1024         metaconn_t      *mc = NULL,
1025                         mc_curr = { 0 };
1026         int             cached = META_TARGET_NONE,
1027                         i = META_TARGET_NONE,
1028                         err = LDAP_SUCCESS,
1029                         new_conn = 0,
1030                         ncandidates = 0;
1031
1032
1033         meta_op_type    op_type = META_OP_REQUIRE_SINGLE;
1034         enum            {
1035                 META_DNTYPE_ENTRY,
1036                 META_DNTYPE_PARENT,
1037                 META_DNTYPE_NEWPARENT
1038         }               dn_type = META_DNTYPE_ENTRY;
1039         struct berval   ndn = op->o_req_ndn,
1040                         pndn;
1041
1042         SlapReply       *candidates = meta_back_candidates_get( op );
1043
1044         /* Internal searches are privileged and shared. So is root. */
1045         if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) )
1046                 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) )
1047                 || op->o_do_not_cache || be_isroot( op ) )
1048         {
1049                 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr );
1050                 mc_curr.mc_local_ndn = op->o_bd->be_rootndn;
1051                 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op );
1052
1053         } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) )
1054         {
1055                 LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1056                 BER_BVSTR( &mc_curr.mc_local_ndn, "" );
1057                 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1058
1059         } else {
1060                 mc_curr.mc_local_ndn = op->o_ndn;
1061
1062                 /* Explicit binds must not be shared */
1063                 if ( !BER_BVISEMPTY( &op->o_ndn )
1064                         || op->o_tag == LDAP_REQ_BIND
1065                         || SLAP_IS_AUTHZ_BACKEND( op ) )
1066                 {
1067                         mc_curr.mc_conn = op->o_conn;
1068
1069                 } else {
1070                         LDAP_BACK_CONN_ISANON_SET( &mc_curr );
1071                         LDAP_BACK_PCONN_ANON_SET( &mc_curr, op );
1072                 }
1073         }
1074
1075         /* Explicit Bind requests always get their own conn */
1076         if ( sendok & LDAP_BACK_BINDING ) {
1077                 mc_curr.mc_conn = op->o_conn;
1078
1079         } else {
1080                 /* Searches for a metaconn in the avl tree */
1081 retry_lock:;
1082                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1083                 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) {
1084                         /* lookup a conn that's not binding */
1085                         LDAP_TAILQ_FOREACH( mc,
1086                                 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv,
1087                                 mc_q )
1088                         {
1089                                 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) {
1090                                         break;
1091                                 }
1092                         }
1093
1094                         if ( mc != NULL ) {
1095                                 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1096                                         metaconn_t, mc_q ) )
1097                                 {
1098                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1099                                                 mc, mc_q );
1100                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1101                                         LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1102                                                 mc, mc_q );
1103                                 }
1104
1105                         } else if ( !LDAP_BACK_USE_TEMPORARIES( mi )
1106                                 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max )
1107                         {
1108                                 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv );
1109                         }
1110
1111
1112                 } else {
1113                         mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1114                                 (caddr_t)&mc_curr, meta_back_conndn_cmp );
1115                 }
1116
1117                 if ( mc ) {
1118                         /* catch taint errors */
1119                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1120
1121                         /* Don't reuse connections while they're still binding
1122                          * NOTE: only makes sense for binds */
1123                         if ( LDAP_BACK_CONN_BINDING( mc ) ) {
1124                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1125                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1126
1127                                         ldap_pvt_thread_yield();
1128                                         goto retry_lock;
1129                                 }
1130
1131                                 /* release conn, and create a temporary */
1132                                 mc = NULL;
1133
1134                         } else {
1135                                 if ( ( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl )
1136                                         || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout ) )
1137                                 {
1138 #if META_BACK_PRINT_CONNTREE > 0
1139                                         meta_back_print_conntree( mi,
1140                                                 ">>> meta_back_getconn(expired)" );
1141 #endif /* META_BACK_PRINT_CONNTREE */
1142
1143                                         /* don't let anyone else use this expired connection */
1144                                         if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1145                                                 if ( mc->mc_q.tqe_prev != NULL ) {
1146                                                         assert( LDAP_BACK_CONN_CACHED( mc ) );
1147                                                         assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1148                                                         LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv,
1149                                                                 mc, mc_q );
1150                                                         mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1151                                                         LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1152
1153                                                 } else {
1154                                                         assert( !LDAP_BACK_CONN_CACHED( mc ) );
1155                                                 }
1156
1157                                         } else {
1158                                                 (void)avl_delete( &mi->mi_conninfo.lai_tree,
1159                                                         (caddr_t)mc, meta_back_conndnmc_cmp );
1160                                         }
1161
1162 #if META_BACK_PRINT_CONNTREE > 0
1163                                         meta_back_print_conntree( mi,
1164                                                 "<<< meta_back_getconn(expired)" );
1165 #endif /* META_BACK_PRINT_CONNTREE */
1166                                         LDAP_BACK_CONN_TAINTED_SET( mc );
1167                                         LDAP_BACK_CONN_CACHED_CLEAR( mc );
1168
1169                                         Debug( LDAP_DEBUG_TRACE, "%s meta_back_getconn: mc=%p conn=%ld expired (tainted).\n",
1170                                                 op->o_log_prefix, (void *)mc, LDAP_BACK_PCONN_ID( mc ) );
1171                                 }
1172
1173                                 mc->mc_refcnt++;
1174                         }
1175                 }
1176                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1177         }
1178
1179         switch ( op->o_tag ) {
1180         case LDAP_REQ_ADD:
1181                 /* if we go to selection, the entry must not exist,
1182                  * and we must be able to resolve the parent */
1183                 dn_type = META_DNTYPE_PARENT;
1184                 dnParent( &ndn, &pndn );
1185                 break;
1186
1187         case LDAP_REQ_MODRDN:
1188                 /* if nnewSuperior is not NULL, it must resolve
1189                  * to the same candidate as the req_ndn */
1190                 if ( op->orr_nnewSup ) {
1191                         dn_type = META_DNTYPE_NEWPARENT;
1192                 }
1193                 break;
1194
1195         case LDAP_REQ_BIND:
1196                 /* if bound as rootdn, the backend must bind to all targets
1197                  * with the administrative identity
1198                  * (unless pseoudoroot-bind-defer is TRUE) */
1199                 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
1200                         op_type = META_OP_REQUIRE_ALL;
1201                 }
1202                 break;
1203
1204         case LDAP_REQ_COMPARE:
1205         case LDAP_REQ_DELETE:
1206         case LDAP_REQ_MODIFY:
1207                 /* just a unique candidate */
1208                 break;
1209
1210         case LDAP_REQ_SEARCH:
1211                 /* allow multiple candidates for the searchBase */
1212                 op_type = META_OP_ALLOW_MULTIPLE;
1213                 break;
1214
1215         default:
1216                 /* right now, just break (exop?) */
1217                 break;
1218         }
1219
1220         /*
1221          * require all connections ...
1222          */
1223         if ( op_type == META_OP_REQUIRE_ALL ) {
1224
1225                 /* Looks like we didn't get a bind. Open a new session... */
1226                 if ( mc == NULL ) {
1227                         assert( new_conn == 0 );
1228                         mc = metaconn_alloc( op );
1229                         mc->mc_conn = mc_curr.mc_conn;
1230                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1231                         new_conn = 1;
1232                         if ( sendok & LDAP_BACK_BINDING ) {
1233                                 LDAP_BACK_CONN_BINDING_SET( mc );
1234                         }
1235                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1236                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1237
1238                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1239                                 LDAP_BACK_CONN_ISANON_SET( mc );
1240                         }
1241
1242                 } else if ( 0 ) {
1243                         /* TODO: if any of the connections is binding,
1244                          * release mc and create a new one */
1245                 }
1246
1247                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1248                         /*
1249                          * The target is activated; if needed, it is
1250                          * also init'd
1251                          */
1252                         candidates[ i ].sr_err = meta_back_init_one_conn( op,
1253                                 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1254                                 LDAP_BACK_DONTSEND, !new_conn );
1255                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1256                                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1257                                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1258                                 }
1259                                 META_CANDIDATE_SET( &candidates[ i ] );
1260                                 ncandidates++;
1261
1262                         } else {
1263
1264                                 /*
1265                                  * FIXME: in case one target cannot
1266                                  * be init'd, should the other ones
1267                                  * be tried?
1268                                  */
1269                                 META_CANDIDATE_RESET( &candidates[ i ] );
1270                                 err = candidates[ i ].sr_err;
1271                                 continue;
1272                         }
1273                 }
1274
1275                 if ( ncandidates == 0 ) {
1276                         if ( new_conn ) {
1277                                 mc->mc_refcnt = 0;
1278                                 meta_back_conn_free( mc );
1279
1280                         } else {
1281                                 meta_back_release_conn( mi, mc );
1282                         }
1283
1284                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
1285                         rs->sr_text = "Unable to select valid candidates";
1286
1287                         if ( sendok & LDAP_BACK_SENDERR ) {
1288                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1289                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1290                                 }
1291                                 send_ldap_result( op, rs );
1292                                 rs->sr_matched = NULL;
1293                         }
1294
1295                         return NULL;
1296                 }
1297
1298                 goto done;
1299         }
1300
1301         /*
1302          * looks in cache, if any
1303          */
1304         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1305                 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn );
1306         }
1307
1308         if ( op_type == META_OP_REQUIRE_SINGLE ) {
1309                 metatarget_t            *mt = NULL;
1310                 metasingleconn_t        *msc = NULL;
1311
1312                 int                     j;
1313
1314                 for ( j = 0; j < mi->mi_ntargets; j++ ) {
1315                         META_CANDIDATE_RESET( &candidates[ j ] );
1316                 }
1317
1318                 /*
1319                  * tries to get a unique candidate
1320                  * (takes care of default target)
1321                  */
1322                 if ( i == META_TARGET_NONE ) {
1323                         i = meta_back_get_candidate( op, rs, &ndn );
1324
1325                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) {
1326                                 i = meta_back_get_candidate( op, rs, &pndn );
1327                         }
1328
1329                         if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) {
1330                                 if ( mc != NULL ) {
1331                                         meta_back_release_conn( mi, mc );
1332                                 }
1333
1334                                 if ( sendok & LDAP_BACK_SENDERR ) {
1335                                         if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1336                                                 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1337                                         }
1338                                         send_ldap_result( op, rs );
1339                                         rs->sr_matched = NULL;
1340                                 }
1341
1342                                 return NULL;
1343                         }
1344                 }
1345
1346                 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
1347                 {
1348                         if ( mc != NULL ) {
1349                                 meta_back_release_conn( mi, mc );
1350                         }
1351
1352                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1353                         rs->sr_text = "Cross-target rename not supported";
1354                         if ( sendok & LDAP_BACK_SENDERR ) {
1355                                 send_ldap_result( op, rs );
1356                         }
1357
1358                         return NULL;
1359                 }
1360
1361                 Debug( LDAP_DEBUG_TRACE,
1362         "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n",
1363                                 i, op->o_req_ndn.bv_val, 0 );
1364
1365                 if ( mc == NULL ) {
1366                         /* Retries searching for a metaconn in the avl tree
1367                          * the reason is that the connection might have been
1368                          * created by meta_back_get_candidate() */
1369                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
1370 retry_lock2:;
1371                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1372                                 mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree,
1373                                         (caddr_t)&mc_curr, meta_back_conndn_cmp );
1374                                 if ( mc != NULL ) {
1375                                         /* catch taint errors */
1376                                         assert( !LDAP_BACK_CONN_TAINTED( mc ) );
1377
1378                                         /* Don't reuse connections while they're still binding */
1379                                         if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] )
1380                                                 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) )
1381                                         {
1382                                                 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1383                                                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1384                                                         ldap_pvt_thread_yield();
1385                                                         goto retry_lock2;
1386                                                 }
1387
1388                                                 mc = NULL;
1389
1390                                         } else {
1391                                                 mc->mc_refcnt++;
1392                                         }
1393                                 }
1394                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1395                         }
1396
1397                         /* Looks like we didn't get a bind. Open a new session... */
1398                         if ( mc == NULL ) {
1399                                 assert( new_conn == 0 );
1400                                 mc = metaconn_alloc( op );
1401                                 mc->mc_conn = mc_curr.mc_conn;
1402                                 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1403                                 new_conn = 1;
1404                                 if ( sendok & LDAP_BACK_BINDING ) {
1405                                         LDAP_BACK_CONN_BINDING_SET( mc );
1406                                 }
1407                                 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1408                                         LDAP_BACK_CONN_ISPRIV_SET( mc );
1409
1410                                 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1411                                         LDAP_BACK_CONN_ISANON_SET( mc );
1412                                 }
1413                         }
1414                 }
1415
1416                 /*
1417                  * Clear all other candidates
1418                  */
1419                 ( void )meta_clear_unused_candidates( op, i );
1420
1421                 mt = mi->mi_targets[ i ];
1422                 msc = &mc->mc_conns[ i ];
1423
1424                 /*
1425                  * The target is activated; if needed, it is
1426                  * also init'd. In case of error, meta_back_init_one_conn
1427                  * sends the appropriate result.
1428                  */
1429                 err = meta_back_init_one_conn( op, rs, mc, i,
1430                         LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn );
1431                 if ( err != LDAP_SUCCESS ) {
1432                         /*
1433                          * FIXME: in case one target cannot
1434                          * be init'd, should the other ones
1435                          * be tried?
1436                          */
1437                         META_CANDIDATE_RESET( &candidates[ i ] );
1438                         if ( new_conn ) {
1439                                 mc->mc_refcnt = 0;
1440                                 meta_back_conn_free( mc );
1441
1442                         } else {
1443                                 meta_back_release_conn( mi, mc );
1444                         }
1445                         return NULL;
1446                 }
1447
1448                 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) {
1449                         LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] );
1450                 }
1451
1452                 candidates[ i ].sr_err = LDAP_SUCCESS;
1453                 META_CANDIDATE_SET( &candidates[ i ] );
1454                 ncandidates++;
1455
1456                 if ( candidate ) {
1457                         *candidate = i;
1458                 }
1459
1460         /*
1461          * if no unique candidate ...
1462          */
1463         } else {
1464
1465                 /* Looks like we didn't get a bind. Open a new session... */
1466                 if ( mc == NULL ) {
1467                         assert( new_conn == 0 );
1468                         mc = metaconn_alloc( op );
1469                         mc->mc_conn = mc_curr.mc_conn;
1470                         ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn );
1471                         new_conn = 1;
1472                         if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) {
1473                                 LDAP_BACK_CONN_ISPRIV_SET( mc );
1474
1475                         } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) {
1476                                 LDAP_BACK_CONN_ISANON_SET( mc );
1477                         }
1478                 }
1479
1480                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1481                         metatarget_t            *mt = mi->mi_targets[ i ];
1482
1483                         META_CANDIDATE_RESET( &candidates[ i ] );
1484
1485                         if ( i == cached
1486                                 || meta_back_is_candidate( mt, &op->o_req_ndn,
1487                                         LDAP_SCOPE_SUBTREE ) )
1488                         {
1489
1490                                 /*
1491                                  * The target is activated; if needed, it is
1492                                  * also init'd
1493                                  */
1494                                 int lerr = meta_back_init_one_conn( op, rs, mc, i,
1495                                         LDAP_BACK_CONN_ISPRIV( &mc_curr ),
1496                                         LDAP_BACK_DONTSEND, !new_conn );
1497                                 candidates[ i ].sr_err = lerr;
1498                                 if ( lerr == LDAP_SUCCESS ) {
1499                                         META_CANDIDATE_SET( &candidates[ i ] );
1500                                         ncandidates++;
1501
1502                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n",
1503                                                 op->o_log_prefix, i, 0 );
1504
1505                                 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) {
1506                                         META_CANDIDATE_SET( &candidates[ i ] );
1507
1508                                         Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n",
1509                                                 op->o_log_prefix, i,
1510                                                 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" );
1511
1512                                 } else {
1513
1514                                         /*
1515                                          * FIXME: in case one target cannot
1516                                          * be init'd, should the other ones
1517                                          * be tried?
1518                                          */
1519                                         if ( new_conn ) {
1520                                                 ( void )meta_clear_one_candidate( op, mc, i );
1521                                         }
1522                                         /* leave the target candidate, but record the error for later use */
1523                                         err = lerr;
1524
1525                                         if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) {
1526                                                 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] quarantined err=%d\n",
1527                                                         op->o_log_prefix, i, lerr );
1528
1529                                         } else {
1530                                                 Debug( LDAP_DEBUG_ANY, "%s: meta_back_getconn[%d] failed err=%d\n",
1531                                                         op->o_log_prefix, i, lerr );
1532                                         }
1533
1534                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1535                                                 if ( sendok & LDAP_BACK_SENDERR ) {
1536                                                         send_ldap_result( op, rs );
1537                                                 }
1538                                                 if ( new_conn ) {
1539                                                         mc->mc_refcnt = 0;
1540                                                         meta_back_conn_free( mc );
1541
1542                                                 } else {
1543                                                         meta_back_release_conn( mi, mc );
1544                                                 }
1545
1546                                                 return NULL;
1547                                         }
1548
1549                                         continue;
1550                                 }
1551
1552                         } else {
1553                                 if ( new_conn ) {
1554                                         ( void )meta_clear_one_candidate( op, mc, i );
1555                                 }
1556                         }
1557                 }
1558
1559                 if ( ncandidates == 0 ) {
1560                         if ( new_conn ) {
1561                                 mc->mc_refcnt = 0;
1562                                 meta_back_conn_free( mc );
1563
1564                         } else {
1565                                 meta_back_release_conn( mi, mc );
1566                         }
1567
1568                         if ( rs->sr_err == LDAP_SUCCESS ) {
1569                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1570                                 rs->sr_text = "Unable to select valid candidates";
1571                         }
1572
1573                         if ( sendok & LDAP_BACK_SENDERR ) {
1574                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
1575                                         rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val;
1576                                 }
1577                                 send_ldap_result( op, rs );
1578                                 rs->sr_matched = NULL;
1579                         }
1580
1581                         return NULL;
1582                 }
1583         }
1584
1585 done:;
1586         /* clear out meta_back_init_one_conn non-fatal errors */
1587         rs->sr_err = LDAP_SUCCESS;
1588         rs->sr_text = NULL;
1589
1590         /* touch the timestamp */
1591         if ( mi->mi_idle_timeout != 0 ) {
1592                 mc->mc_time = op->o_time;
1593         }
1594
1595         if ( new_conn ) {
1596                 if ( mi->mi_conn_ttl ) {
1597                         mc->mc_create_time = op->o_time;
1598                 }
1599
1600                 /*
1601                  * Inserts the newly created metaconn in the avl tree
1602                  */
1603                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1604 #if META_BACK_PRINT_CONNTREE > 0
1605                 meta_back_print_conntree( mi, ">>> meta_back_getconn" );
1606 #endif /* META_BACK_PRINT_CONNTREE */
1607
1608                 err = 0;
1609                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1610                         if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) {
1611                                 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1612                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++;
1613                                 LDAP_BACK_CONN_CACHED_SET( mc );
1614
1615                         } else {
1616                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1617                         }
1618                         rs->sr_err = 0;
1619
1620                 } else if ( !( sendok & LDAP_BACK_BINDING ) ) {
1621                         err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc,
1622                                 meta_back_conndn_cmp, meta_back_conndn_dup );
1623                         LDAP_BACK_CONN_CACHED_SET( mc );
1624                 }
1625
1626 #if META_BACK_PRINT_CONNTREE > 0
1627                 meta_back_print_conntree( mi, "<<< meta_back_getconn" );
1628 #endif /* META_BACK_PRINT_CONNTREE */
1629                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1630
1631                 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1632                         /*
1633                          * Err could be -1 in case a duplicate metaconn is inserted
1634                          */
1635                         switch ( err ) {
1636                         case 0:
1637                                 break;
1638
1639                         case -1:
1640                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1641                                 /* duplicate: free and try to get the newly created one */
1642                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) {
1643                                         mc->mc_refcnt = 0;
1644                                         meta_back_conn_free( mc );
1645
1646                                         new_conn = 0;
1647                                         goto retry_lock;
1648                                 }
1649
1650                                 LDAP_BACK_CONN_TAINTED_SET( mc );
1651                                 break;
1652
1653                         default:
1654                                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1655                                 Debug( LDAP_DEBUG_ANY,
1656                                         "%s meta_back_getconn: candidates=%d conn=%ld insert failed\n",
1657                                         op->o_log_prefix, ncandidates,
1658                                         LDAP_BACK_PCONN_ID( mc ) );
1659
1660                                 mc->mc_refcnt = 0;
1661                                 meta_back_conn_free( mc );
1662
1663                                 rs->sr_err = LDAP_OTHER;
1664                                 rs->sr_text = "Proxy bind collision";
1665                                 if ( sendok & LDAP_BACK_SENDERR ) {
1666                                         send_ldap_result( op, rs );
1667                                 }
1668                                 return NULL;
1669                         }
1670                 }
1671
1672                 Debug( LDAP_DEBUG_TRACE,
1673                         "%s meta_back_getconn: candidates=%d conn=%ld inserted\n",
1674                         op->o_log_prefix, ncandidates,
1675                         LDAP_BACK_PCONN_ID( mc ) );
1676
1677         } else {
1678                 Debug( LDAP_DEBUG_TRACE,
1679                         "%s meta_back_getconn: candidates=%d conn=%ld fetched\n",
1680                         op->o_log_prefix, ncandidates,
1681                         LDAP_BACK_PCONN_ID( mc ) );
1682         }
1683
1684         return mc;
1685 }
1686
1687 void
1688 meta_back_release_conn_lock(
1689         metainfo_t              *mi,
1690         metaconn_t              *mc,
1691         int                     dolock )
1692 {
1693         assert( mc != NULL );
1694
1695         if ( dolock ) {
1696                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1697         }
1698         assert( mc->mc_refcnt > 0 );
1699         mc->mc_refcnt--;
1700         /* NOTE: the connection is removed if either it is tainted
1701          * or if it is shared and no one else is using it.  This needs
1702          * to occur because for intrinsic reasons cached connections
1703          * that are not privileged would live forever and pollute
1704          * the connection space (and eat up resources).  Maybe this
1705          * should be configurable... */
1706         if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) {
1707 #if META_BACK_PRINT_CONNTREE > 0
1708                 meta_back_print_conntree( mi, ">>> meta_back_release_conn" );
1709 #endif /* META_BACK_PRINT_CONNTREE */
1710
1711                 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) {
1712                         if ( mc->mc_q.tqe_prev != NULL ) {
1713                                 assert( LDAP_BACK_CONN_CACHED( mc ) );
1714                                 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 );
1715                                 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q );
1716                                 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--;
1717                                 LDAP_TAILQ_ENTRY_INIT( mc, mc_q );
1718
1719                         } else {
1720                                 assert( !LDAP_BACK_CONN_CACHED( mc ) );
1721                         }
1722
1723                 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) {
1724                         metaconn_t      *tmpmc;
1725
1726                         tmpmc = avl_delete( &mi->mi_conninfo.lai_tree,
1727                                 ( caddr_t )mc, meta_back_conndnmc_cmp );
1728
1729                         /* Overparanoid, but useful... */
1730                         assert( tmpmc == NULL || tmpmc == mc );
1731                 }
1732
1733                 LDAP_BACK_CONN_CACHED_CLEAR( mc );
1734
1735 #if META_BACK_PRINT_CONNTREE > 0
1736                 meta_back_print_conntree( mi, "<<< meta_back_release_conn" );
1737 #endif /* META_BACK_PRINT_CONNTREE */
1738
1739                 if ( mc->mc_refcnt == 0 ) {
1740                         meta_back_conn_free( mc );
1741                         mc = NULL;
1742                 }
1743         }
1744
1745         if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) {
1746                 LDAP_BACK_CONN_BINDING_CLEAR( mc );
1747         }
1748
1749         if ( dolock ) {
1750                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1751         }
1752 }
1753
1754 void
1755 meta_back_quarantine(
1756         Operation       *op,
1757         SlapReply       *rs,
1758         int             candidate )
1759 {
1760         metainfo_t              *mi = (metainfo_t *)op->o_bd->be_private;
1761         metatarget_t            *mt = mi->mi_targets[ candidate ];
1762
1763         slap_retry_info_t       *ri = &mt->mt_quarantine;
1764
1765         ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex );
1766
1767         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1768                 time_t  new_last = slap_get_time();
1769
1770                 switch ( mt->mt_isquarantined ) {
1771                 case LDAP_BACK_FQ_NO:
1772                         if ( ri->ri_last == new_last ) {
1773                                 goto done;
1774                         }
1775
1776                         Debug( LDAP_DEBUG_ANY,
1777                                 "%s meta_back_quarantine[%d]: enter.\n",
1778                                 op->o_log_prefix, candidate, 0 );
1779
1780                         ri->ri_idx = 0;
1781                         ri->ri_count = 0;
1782                         break;
1783
1784                 case LDAP_BACK_FQ_RETRYING:
1785                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
1786                                 char    buf[ SLAP_TEXT_BUFLEN ];
1787
1788                                 snprintf( buf, sizeof( buf ),
1789                                         "meta_back_quarantine[%d]: block #%d try #%d failed",
1790                                         candidate, ri->ri_idx, ri->ri_count );
1791                                 Debug( LDAP_DEBUG_ANY, "%s %s.\n",
1792                                         op->o_log_prefix, buf, 0 );
1793                         }
1794
1795                         ++ri->ri_count;
1796                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1797                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1798                         {
1799                                 ri->ri_count = 0;
1800                                 ++ri->ri_idx;
1801                         }
1802                         break;
1803
1804                 default:
1805                         break;
1806                 }
1807
1808                 mt->mt_isquarantined = LDAP_BACK_FQ_YES;
1809                 ri->ri_last = new_last;
1810
1811         } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) {
1812                 Debug( LDAP_DEBUG_ANY,
1813                         "%s meta_back_quarantine[%d]: exit.\n",
1814                         op->o_log_prefix, candidate, 0 );
1815
1816                 if ( mi->mi_quarantine_f ) {
1817                         (void)mi->mi_quarantine_f( mi, candidate,
1818                                 mi->mi_quarantine_p );
1819                 }
1820
1821                 ri->ri_count = 0;
1822                 ri->ri_idx = 0;
1823                 mt->mt_isquarantined = LDAP_BACK_FQ_NO;
1824         }
1825
1826 done:;
1827         ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex );
1828 }
1829