git.sur5r.net Git - openldap/blob - servers/slapd/back-meta/search.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1999-2006 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/socket.h>
  28 #include <ac/string.h>
  29 #include <ac/time.h>
  30
  31 #include "slap.h"
  32 #include "../back-ldap/back-ldap.h"
  33 #include "back-meta.h"
  34 #undef ldap_debug       /* silence a warning in ldap-int.h */
  35 #include "ldap_log.h"
  36 #include "../../../libraries/libldap/ldap-int.h"
  37
  38 /* IGNORE means that target does not (no longer) participate
  39  * in the search;
  40  * NOTREADY means the search on that target has not been initialized yet
  41  */
  42 #define META_MSGID_IGNORE       (-1)
  43 #define META_MSGID_NEED_BIND    (-2)
  44
  45 static int
  46 meta_send_entry(
  47         Operation       *op,
  48         SlapReply       *rs,
  49         metaconn_t      *mc,
  50         int             i,
  51         LDAPMessage     *e );
  52
  53 typedef enum meta_search_candidate_t {
  54         META_SEARCH_ERR = -1,
  55         META_SEARCH_NOT_CANDIDATE,
  56         META_SEARCH_CANDIDATE,
  57         META_SEARCH_BINDING,
  58         META_SEARCH_NEED_BIND
  59 } meta_search_candidate_t;
  60
  61 /*
  62  * meta_search_dobind_init()
  63  *
  64  * initiates bind for a candidate target of a search.
  65  */
  66 static meta_search_candidate_t
  67 meta_search_dobind_init(
  68         Operation               *op,
  69         SlapReply               *rs,
  70         metaconn_t              **mcp,
  71         int                     candidate,
  72         SlapReply               *candidates )
  73 {
  74         metaconn_t              *mc = *mcp;
  75         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
  76         metatarget_t            *mt = mi->mi_targets[ candidate ];
  77         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
  78
  79         char                    *binddn = "";
  80         struct berval           cred = BER_BVC( "" );
  81
  82         int                     rc;
  83         int                     nretries = 1;
  84
  85         meta_search_candidate_t retcode;
  86
  87         Debug( LDAP_DEBUG_TRACE, "%s >>> meta_search_dobind_init[%d]\n", op->o_log_prefix, candidate, 0 );
  88
  89         /*
  90          * all the targets are already bound as pseudoroot
  91          */
  92         if ( mc->mc_authz_target == META_BOUND_ALL ) {
  93                 return META_SEARCH_CANDIDATE;
  94         }
  95
  96         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
  97         if ( LDAP_BACK_CONN_ISBOUND( msc ) || LDAP_BACK_CONN_ISANON( msc ) ) {
  98                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
  99                 return META_SEARCH_CANDIDATE;
 100         }
 101
 102         if ( LDAP_BACK_CONN_BINDING( msc ) ) {
 103                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 104                 candidates[ candidate ].sr_msgid = META_MSGID_NEED_BIND;
 105                 return META_SEARCH_NEED_BIND;
 106         }
 107
 108         LDAP_BACK_CONN_BINDING_SET( msc );
 109         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 110
 111         if ( be_isroot( op ) && !BER_BVISNULL( &mt->mt_pseudorootdn ) ) {
 112                 binddn = mt->mt_pseudorootdn.bv_val;
 113                 cred = mt->mt_pseudorootpw;
 114         }
 115
 116         /*
 117          * Otherwise an anonymous bind is performed
 118          * (note: if the target was already bound, the anonymous
 119          * bind clears the previous bind).
 120          */
 121         if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 122                 ber_memfree( msc->msc_bound_ndn.bv_val );
 123                 BER_BVZERO( &msc->msc_bound_ndn );
 124         }
 125
 126         if ( LDAP_BACK_SAVECRED( mi ) && !BER_BVISNULL( &msc->msc_cred ) ) {
 127                 /* destroy sensitive data */
 128                 memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 129                 ber_memfree( msc->msc_cred.bv_val );
 130                 BER_BVZERO( &msc->msc_cred );
 131         }
 132
 133 retry:;
 134         assert( msc->msc_ld != NULL );
 135
 136         rc = ldap_sasl_bind( msc->msc_ld, binddn, LDAP_SASL_SIMPLE, &cred,
 137                         NULL, NULL, &candidates[ candidate ].sr_msgid );
 138         switch ( rc ) {
 139         case LDAP_SUCCESS:
 140                 return META_SEARCH_BINDING;
 141
 142         case LDAP_SERVER_DOWN:
 143                 if ( nretries && meta_back_retry( op, rs, mcp, candidate, LDAP_BACK_DONTSEND ) ) {
 144                         nretries = 0;
 145                         goto retry;
 146                 }
 147
 148                 if ( *mcp == NULL ) {
 149                         retcode = META_SEARCH_ERR;
 150                         rs->sr_err = LDAP_UNAVAILABLE;
 151                         break;
 152                 }
 153                 /* fall thru */
 154
 155         default:
 156                 rs->sr_err = rc;
 157                 rc = slap_map_api2result( rs );
 158
 159                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 160                 LDAP_BACK_CONN_BINDING_CLEAR( msc );
 161                 if ( META_BACK_ONERR_STOP( mi ) ) {
 162                         LDAP_BACK_CONN_TAINTED_SET( mc );
 163                         meta_back_release_conn( op, mc );
 164                         *mcp = NULL;
 165
 166                         retcode = META_SEARCH_ERR;
 167
 168                 } else {
 169                         candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 170                         retcode = META_SEARCH_NOT_CANDIDATE;
 171                 }
 172                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 173                 break;
 174         }
 175
 176         return retcode;
 177 }
 178
 179 static meta_search_candidate_t
 180 meta_search_dobind_result(
 181         Operation               *op,
 182         SlapReply               *rs,
 183         metaconn_t              **mcp,
 184         int                     candidate,
 185         SlapReply               *candidates,
 186         LDAPMessage             *res )
 187 {
 188         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 189         metaconn_t              *mc = *mcp;
 190         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 191
 192         meta_search_candidate_t retcode = META_SEARCH_NOT_CANDIDATE;
 193         int                     rc;
 194
 195         assert( msc->msc_ld != NULL );
 196
 197         rc = ldap_parse_result( msc->msc_ld, res,
 198                 &candidates[ candidate ].sr_err,
 199                 NULL, NULL, NULL, NULL, 1 );
 200         if ( rc == LDAP_SUCCESS ) {
 201                 rc = slap_map_api2result( &candidates[ candidate ] );
 202         }
 203
 204         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 205         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 206         if ( rc != LDAP_SUCCESS ) {
 207                 if ( META_BACK_ONERR_STOP( mi ) ) {
 208                         LDAP_BACK_CONN_TAINTED_SET( mc );
 209                         meta_back_release_conn( op, mc );
 210                         *mcp = NULL;
 211                         retcode = META_SEARCH_ERR;
 212                 }
 213
 214         } else {
 215                 if ( be_isroot( op ) ) {
 216                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 217                 } else {
 218                         LDAP_BACK_CONN_ISANON_SET( msc );
 219                 }
 220                 retcode = META_SEARCH_CANDIDATE;
 221         }
 222         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 223
 224         return retcode;
 225 }
 226
 227 static meta_search_candidate_t
 228 meta_back_search_start(
 229         Operation               *op,
 230         SlapReply               *rs,
 231         dncookie                *dc,
 232         metaconn_t              **mcp,
 233         int                     candidate,
 234         SlapReply               *candidates )
 235 {
 236         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 237         metatarget_t            *mt = mi->mi_targets[ candidate ];
 238         metaconn_t              *mc = *mcp;
 239         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 240         struct berval           realbase = op->o_req_dn;
 241         int                     realscope = op->ors_scope;
 242         ber_len_t               suffixlen = 0;
 243         struct berval           mbase = BER_BVNULL;
 244         struct berval           mfilter = BER_BVNULL;
 245         char                    **mapped_attrs = NULL;
 246         int                     rc;
 247         meta_search_candidate_t retcode;
 248         struct timeval          tv, *tvp = NULL;
 249         int                     nretries = 1;
 250
 251         Debug( LDAP_DEBUG_TRACE, "%s >>> meta_back_search_start[%d]\n", op->o_log_prefix, candidate, 0 );
 252
 253         /* should we check return values? */
 254         if ( op->ors_deref != -1 ) {
 255                 assert( msc->msc_ld != NULL );
 256                 (void)ldap_set_option( msc->msc_ld, LDAP_OPT_DEREF,
 257                                 ( void * )&op->ors_deref );
 258         }
 259
 260         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 261                 tv.tv_sec = op->ors_tlimit > 0 ? op->ors_tlimit : 1;
 262                 tv.tv_usec = 0;
 263                 tvp = &tv;
 264         }
 265
 266         dc->target = mt;
 267
 268         /*
 269          * modifies the base according to the scope, if required
 270          */
 271         suffixlen = mt->mt_nsuffix.bv_len;
 272         if ( suffixlen > op->o_req_ndn.bv_len ) {
 273                 switch ( op->ors_scope ) {
 274                 case LDAP_SCOPE_SUBTREE:
 275                         /*
 276                          * make the target suffix the new base
 277                          * FIXME: this is very forgiving, because
 278                          * "illegal" searchBases may be turned
 279                          * into the suffix of the target; however,
 280                          * the requested searchBase already passed
 281                          * thru the candidate analyzer...
 282                          */
 283                         if ( dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) ) {
 284                                 realbase = mt->mt_nsuffix;
 285                                 if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 286                                         realscope = LDAP_SCOPE_SUBORDINATE;
 287                                 }
 288
 289                         } else {
 290                                 /*
 291                                  * this target is no longer candidate
 292                                  */
 293                                 return META_SEARCH_NOT_CANDIDATE;
 294                         }
 295                         break;
 296
 297                 case LDAP_SCOPE_SUBORDINATE:
 298                 case LDAP_SCOPE_ONELEVEL:
 299                 {
 300                         struct berval   rdn = mt->mt_nsuffix;
 301                         rdn.bv_len -= op->o_req_ndn.bv_len + STRLENOF( "," );
 302                         if ( dnIsOneLevelRDN( &rdn )
 303                                         && dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) )
 304                         {
 305                                 /*
 306                                  * if there is exactly one level,
 307                                  * make the target suffix the new
 308                                  * base, and make scope "base"
 309                                  */
 310                                 realbase = mt->mt_nsuffix;
 311                                 if ( op->ors_scope == LDAP_SCOPE_SUBORDINATE ) {
 312                                         if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 313                                                 realscope = LDAP_SCOPE_SUBORDINATE;
 314                                         } else {
 315                                                 realscope = LDAP_SCOPE_SUBTREE;
 316                                         }
 317                                 } else {
 318                                         realscope = LDAP_SCOPE_BASE;
 319                                 }
 320                                 break;
 321                         } /* else continue with the next case */
 322                 }
 323
 324                 case LDAP_SCOPE_BASE:
 325                         /*
 326                          * this target is no longer candidate
 327                          */
 328                         return META_SEARCH_NOT_CANDIDATE;
 329                 }
 330         }
 331
 332         /* initiate dobind */
 333         retcode = meta_search_dobind_init( op, rs, mcp, candidate, candidates );
 334
 335         Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%d]=%d\n", op->o_log_prefix, candidate, retcode );
 336
 337         if ( retcode != META_SEARCH_CANDIDATE ) {
 338                 return retcode;
 339         }
 340
 341         /*
 342          * Rewrite the search base, if required
 343          */
 344         dc->ctx = "searchBase";
 345         switch ( ldap_back_dn_massage( dc, &realbase, &mbase ) ) {
 346         default:
 347                 break;
 348
 349         case REWRITE_REGEXEC_UNWILLING:
 350                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 351                 rs->sr_text = "Operation not allowed";
 352                 send_ldap_result( op, rs );
 353                 return META_SEARCH_ERR;
 354
 355         case REWRITE_REGEXEC_ERR:
 356
 357                 /*
 358                  * this target is no longer candidate
 359                  */
 360                 return META_SEARCH_NOT_CANDIDATE;
 361         }
 362
 363         /*
 364          * Maps filter
 365          */
 366         rc = ldap_back_filter_map_rewrite( dc, op->ors_filter,
 367                         &mfilter, BACKLDAP_MAP );
 368         switch ( rc ) {
 369         case LDAP_SUCCESS:
 370                 break;
 371
 372         case LDAP_COMPARE_FALSE:
 373         default:
 374                 /*
 375                  * this target is no longer candidate
 376                  */
 377                 retcode = META_SEARCH_NOT_CANDIDATE;
 378                 goto done;
 379         }
 380
 381         /*
 382          * Maps required attributes
 383          */
 384         rc = ldap_back_map_attrs( &mt->mt_rwmap.rwm_at,
 385                         op->ors_attrs, BACKLDAP_MAP, &mapped_attrs );
 386         if ( rc != LDAP_SUCCESS ) {
 387                 /*
 388                  * this target is no longer candidate
 389                  */
 390                 retcode = META_SEARCH_NOT_CANDIDATE;
 391                 goto done;
 392         }
 393
 394         /*
 395          * Starts the search
 396          */
 397 retry:;
 398         assert( msc->msc_ld != NULL );
 399         rc = ldap_search_ext( msc->msc_ld,
 400                         mbase.bv_val, realscope, mfilter.bv_val,
 401                         mapped_attrs, op->ors_attrsonly,
 402                         op->o_ctrls, NULL, tvp, op->ors_slimit,
 403                         &candidates[ candidate ].sr_msgid );
 404         switch ( rc ) {
 405         case LDAP_SUCCESS:
 406                 retcode = META_SEARCH_CANDIDATE;
 407                 break;
 408
 409         case LDAP_SERVER_DOWN:
 410                 if ( nretries && meta_back_retry( op, rs, mcp, candidate, LDAP_BACK_DONTSEND ) ) {
 411                         nretries = 0;
 412                         goto retry;
 413                 }
 414
 415                 if ( *mcp == NULL ) {
 416                         retcode = META_SEARCH_ERR;
 417                         break;
 418                 }
 419                 /* fall thru */
 420
 421         default:
 422                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 423                 retcode = META_SEARCH_NOT_CANDIDATE;
 424         }
 425
 426 done:;
 427         if ( mapped_attrs ) {
 428                 free( mapped_attrs );
 429         }
 430         if ( mfilter.bv_val != op->ors_filterstr.bv_val ) {
 431                 free( mfilter.bv_val );
 432         }
 433         if ( mbase.bv_val != realbase.bv_val ) {
 434                 free( mbase.bv_val );
 435         }
 436
 437         return retcode;
 438 }
 439
 440 int
 441 meta_back_search( Operation *op, SlapReply *rs )
 442 {
 443         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 444         metaconn_t      *mc;
 445         struct timeval  tv = { 0, 0 };
 446         time_t          stoptime = (time_t)-1;
 447         LDAPMessage     *res = NULL, *e;
 448         int             rc = 0, sres = LDAP_SUCCESS;
 449         char            *matched = NULL;
 450         int             last = 0, ncandidates = 0,
 451                         initial_candidates = 0, candidate_match = 0;
 452         long            i;
 453         dncookie        dc;
 454         int             is_ok = 0;
 455         void            *savepriv;
 456         SlapReply       *candidates = meta_back_candidates_get( op );
 457
 458         /*
 459          * controls are set in ldap_back_dobind()
 460          *
 461          * FIXME: in case of values return filter, we might want
 462          * to map attrs and maybe rewrite value
 463          */
 464         mc = meta_back_getconn( op, rs, NULL, LDAP_BACK_SENDERR );
 465         if ( !mc ) {
 466                 return rs->sr_err;
 467         }
 468
 469         dc.conn = op->o_conn;
 470         dc.rs = rs;
 471
 472         /*
 473          * Inits searches
 474          */
 475         for ( i = 0; i < mi->mi_ntargets; i++ ) {
 476                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 477
 478                 if ( candidates[ i ].sr_tag != META_CANDIDATE ) {
 479                         continue;
 480                 }
 481
 482                 candidates[ i ].sr_matched = NULL;
 483                 candidates[ i ].sr_text = NULL;
 484                 candidates[ i ].sr_ref = NULL;
 485                 candidates[ i ].sr_ctrls = NULL;
 486         }
 487
 488         for ( i = 0; i < mi->mi_ntargets; i++ ) {
 489                 if ( candidates[ i ].sr_tag != META_CANDIDATE
 490                         || candidates[ i ].sr_err != LDAP_SUCCESS )
 491                 {
 492                         continue;
 493                 }
 494
 495                 switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
 496                 {
 497                 case META_SEARCH_NOT_CANDIDATE:
 498                         break;
 499
 500                 case META_SEARCH_CANDIDATE:
 501                 case META_SEARCH_BINDING:
 502                 case META_SEARCH_NEED_BIND:
 503                         candidates[ i ].sr_type = REP_INTERMEDIATE;
 504                         ++ncandidates;
 505                         break;
 506
 507                 case META_SEARCH_ERR:
 508                         savepriv = op->o_private;
 509                         op->o_private = (void *)i;
 510                         send_ldap_result( op, rs );
 511                         op->o_private = savepriv;
 512                         rc = -1;
 513                         goto finish;
 514                 }
 515         }
 516
 517         initial_candidates = ncandidates;
 518
 519 #if 0
 520         {
 521                 char    cnd[BUFSIZ];
 522                 int     i;
 523
 524                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
 525                         if ( candidates[ i ].sr_tag == META_CANDIDATE ) {
 526                                 cnd[ i ] = '*';
 527                         } else {
 528                                 cnd[ i ] = ' ';
 529                         }
 530                 }
 531                 cnd[ i ] = '\0';
 532
 533                 Debug( LDAP_DEBUG_ANY, "%s meta_back_search: ncandidates=%d "
 534                         "cnd=\"%s\"\n", op->o_log_prefix, ncandidates, cnd );
 535         }
 536 #endif
 537
 538         if ( initial_candidates == 0 ) {
 539                 /* NOTE: here we are not sending any matchedDN;
 540                  * this is intended, because if the back-meta
 541                  * is serving this search request, but no valid
 542                  * candidate could be looked up, it means that
 543                  * there is a hole in the mapping of the targets
 544                  * and thus no knowledge of any remote superior
 545                  * is available */
 546                 Debug( LDAP_DEBUG_ANY, "%s meta_back_search: "
 547                         "base=\"%s\" scope=%d: "
 548                         "no candidate could be selected\n",
 549                         op->o_log_prefix, op->o_req_dn.bv_val,
 550                         op->ors_scope );
 551
 552                 /* FIXME: we're sending the first error we encounter;
 553                  * maybe we should pick the worst... */
 554                 rc = LDAP_NO_SUCH_OBJECT;
 555                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
 556                         if ( candidates[ i ].sr_tag == META_CANDIDATE
 557                                 && candidates[ i ].sr_err != LDAP_SUCCESS )
 558                         {
 559                                 rc = candidates[ i ].sr_err;
 560                                 break;
 561                         }
 562                 }
 563
 564                 send_ldap_error( op, rs, rc, NULL );
 565
 566                 goto finish;
 567         }
 568
 569         /* We pull apart the ber result, stuff it into a slapd entry, and
 570          * let send_search_entry stuff it back into ber format. Slow & ugly,
 571          * but this is necessary for version matching, and for ACL processing.
 572          */
 573
 574         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 575                 stoptime = op->o_time + op->ors_tlimit;
 576         }
 577
 578         /*
 579          * In case there are no candidates, no cycle takes place...
 580          *
 581          * FIXME: we might use a queue, to better balance the load
 582          * among the candidates
 583          */
 584         for ( rc = 0; ncandidates > 0; ) {
 585                 int     gotit = 0, doabandon = 0;
 586
 587                 /* check time limit */
 588                 if ( op->ors_tlimit != SLAP_NO_LIMIT
 589                                 && slap_get_time() > stoptime )
 590                 {
 591                         doabandon = 1;
 592                         rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 593                         savepriv = op->o_private;
 594                         op->o_private = (void *)i;
 595                         send_ldap_result( op, rs );
 596                         op->o_private = savepriv;
 597                         goto finish;
 598                 }
 599
 600                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
 601                         metasingleconn_t        *msc = &mc->mc_conns[ i ];
 602
 603                         if ( candidates[ i ].sr_msgid == META_MSGID_IGNORE ) {
 604                                 continue;
 605                         }
 606
 607                         if ( candidates[ i ].sr_msgid == META_MSGID_NEED_BIND ) {
 608                                 /* initiate dobind */
 609                                 switch ( meta_search_dobind_init( op, rs, &mc, i, candidates ) )
 610                                 {
 611                                 case META_SEARCH_BINDING:
 612                                 case META_SEARCH_NEED_BIND:
 613                                         break;
 614
 615                                 case META_SEARCH_NOT_CANDIDATE:
 616                                         /*
 617                                          * When no candidates are left,
 618                                          * the outer cycle finishes
 619                                          */
 620                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 621                                         --ncandidates;
 622                                         break;
 623
 624                                 case META_SEARCH_ERR:
 625                                         if ( META_BACK_ONERR_STOP( mi ) ) {
 626                                                 savepriv = op->o_private;
 627                                                 op->o_private = (void *)i;
 628                                                 send_ldap_result( op, rs );
 629                                                 op->o_private = savepriv;
 630                                                 goto finish;
 631                                         }
 632                                         break;
 633
 634                                 case META_SEARCH_CANDIDATE:
 635                                         switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
 636                                         {
 637                                         case META_SEARCH_CANDIDATE:
 638                                                 goto get_result;
 639
 640                                                 /* means that failed but onerr == continue */
 641                                         case META_SEARCH_NOT_CANDIDATE:
 642                                         case META_SEARCH_ERR:
 643                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 644                                                 --ncandidates;
 645
 646                                                 if ( META_BACK_ONERR_STOP( mi ) ) {
 647                                                         savepriv = op->o_private;
 648                                                         op->o_private = (void *)i;
 649                                                         send_ldap_result( op, rs );
 650                                                         op->o_private = savepriv;
 651                                                         goto finish;
 652                                                 }
 653                                                 break;
 654
 655                                         default:
 656                                                 /* impossible */
 657                                                 assert( 0 );
 658                                                 break;
 659                                         }
 660
 661                                 default:
 662                                         /* impossible */
 663                                         assert( 0 );
 664                                         break;
 665                                 }
 666                                 continue;
 667                         }
 668
 669                         /* check for abandon */
 670                         if ( op->o_abandon ) {
 671                                 break;
 672                         }
 673
 674                         /*
 675                          * FIXME: handle time limit as well?
 676                          * Note that target servers are likely
 677                          * to handle it, so at some time we'll
 678                          * get a LDAP_TIMELIMIT_EXCEEDED from
 679                          * one of them ...
 680                          */
 681 get_result:;
 682                         rc = ldap_result( msc->msc_ld, candidates[ i ].sr_msgid,
 683                                         LDAP_MSG_ONE, &tv, &res );
 684
 685                         if ( rc == 0 ) {
 686                                 /* FIXME: res should not need to be freed */
 687                                 assert( res == NULL );
 688
 689                                 continue;
 690
 691                         } else if ( rc == -1 ) {
 692 really_bad:;
 693                                 /* something REALLY bad happened! */
 694                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 695                                         candidates[ i ].sr_type = REP_RESULT;
 696
 697                                         if ( meta_back_retry( op, rs, &mc, i, LDAP_BACK_DONTSEND ) ) {
 698                                                 switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
 699                                                 {
 700                                                 case META_SEARCH_CANDIDATE:
 701                                                         goto get_result;
 702
 703                                                         /* means that failed but onerr == continue */
 704                                                 case META_SEARCH_NOT_CANDIDATE:
 705                                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 706                                                         --ncandidates;
 707
 708                                                         if ( META_BACK_ONERR_STOP( mi ) ) {
 709                                                                 savepriv = op->o_private;
 710                                                                 op->o_private = (void *)i;
 711                                                                 send_ldap_result( op, rs );
 712                                                                 op->o_private = savepriv;
 713                                                                 goto finish;
 714                                                         }
 715                                                         break;
 716
 717                                                 case META_SEARCH_BINDING:
 718                                                 case META_SEARCH_NEED_BIND:
 719                                                         assert( 0 );
 720
 721                                                 default:
 722                                                         rc = rs->sr_err = LDAP_OTHER;
 723                                                         goto finish;
 724                                                 }
 725                                         }
 726
 727                                         if ( META_BACK_ONERR_STOP( mi ) ) {
 728                                                 savepriv = op->o_private;
 729                                                 op->o_private = (void *)i;
 730                                                 send_ldap_result( op, rs );
 731                                                 op->o_private = savepriv;
 732                                                 goto finish;
 733                                         }
 734                                 }
 735
 736                                 /*
 737                                  * When no candidates are left,
 738                                  * the outer cycle finishes
 739                                  */
 740                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 741                                 --ncandidates;
 742                                 rs->sr_err = candidates[ i ].sr_err;
 743
 744                         } else if ( rc == LDAP_RES_SEARCH_ENTRY ) {
 745                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 746                                         /* don't retry any more... */
 747                                         candidates[ i ].sr_type = REP_RESULT;
 748                                 }
 749
 750                                 is_ok++;
 751
 752                                 e = ldap_first_entry( msc->msc_ld, res );
 753                                 savepriv = op->o_private;
 754                                 op->o_private = (void *)i;
 755                                 rs->sr_err = meta_send_entry( op, rs, mc, i, e );
 756                                 ldap_msgfree( res );
 757                                 res = NULL;
 758
 759                                 switch ( rs->sr_err ) {
 760                                 case LDAP_SIZELIMIT_EXCEEDED:
 761                                         savepriv = op->o_private;
 762                                         op->o_private = (void *)i;
 763                                         send_ldap_result( op, rs );
 764                                         op->o_private = savepriv;
 765                                         rs->sr_err = LDAP_SUCCESS;
 766                                         goto finish;
 767
 768                                 case LDAP_UNAVAILABLE:
 769                                         rs->sr_err = LDAP_OTHER;
 770                                         goto finish;
 771                                 }
 772                                 op->o_private = savepriv;
 773
 774                                 /* don't wait any longer... */
 775                                 gotit = 1;
 776                                 tv.tv_sec = 0;
 777                                 tv.tv_usec = 0;
 778
 779 #if 0
 780                                 /*
 781                                  * If scope is BASE, we need to jump out
 782                                  * as soon as one entry is found; if
 783                                  * the target pool is properly crafted,
 784                                  * this should correspond to the sole
 785                                  * entry that has the base DN
 786                                  */
 787                                 /* FIXME: this defeats the purpose of
 788                                  * doing a search with scope == base and
 789                                  * sizelimit = 1 to determine if a
 790                                  * candidate is actually unique */
 791                                 if ( op->ors_scope == LDAP_SCOPE_BASE
 792                                                 && rs->sr_nentries > 0 )
 793                                 {
 794                                         doabandon = 1;
 795                                         ncandidates = 0;
 796                                         sres = LDAP_SUCCESS;
 797                                         break;
 798                                 }
 799 #endif
 800
 801                         } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
 802                                 char            **references = NULL;
 803                                 int             cnt;
 804
 805                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 806                                         /* don't retry any more... */
 807                                         candidates[ i ].sr_type = REP_RESULT;
 808                                 }
 809
 810                                 is_ok++;
 811
 812                                 rc = ldap_parse_reference( msc->msc_ld, res,
 813                                                 &references, &rs->sr_ctrls, 1 );
 814                                 res = NULL;
 815
 816                                 if ( rc != LDAP_SUCCESS ) {
 817                                         continue;
 818                                 }
 819
 820                                 if ( references == NULL ) {
 821                                         continue;
 822                                 }
 823
 824 #ifdef ENABLE_REWRITE
 825                                 dc.ctx = "referralDN";
 826 #else /* ! ENABLE_REWRITE */
 827                                 dc.tofrom = 0;
 828                                 dc.normalized = 0;
 829 #endif /* ! ENABLE_REWRITE */
 830
 831                                 /* FIXME: merge all and return at the end */
 832
 833                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 834                                         ;
 835
 836                                 rs->sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
 837
 838                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 839                                         ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
 840                                 }
 841                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 842
 843                                 ( void )ldap_back_referral_result_rewrite( &dc, rs->sr_ref );
 844
 845                                 if ( rs->sr_ref != NULL && !BER_BVISNULL( &rs->sr_ref[ 0 ] ) ) {
 846                                         /* ignore return value by now */
 847                                         savepriv = op->o_private;
 848                                         op->o_private = (void *)i;
 849                                         ( void )send_search_reference( op, rs );
 850                                         op->o_private = savepriv;
 851
 852                                         ber_bvarray_free( rs->sr_ref );
 853                                         rs->sr_ref = NULL;
 854                                 }
 855
 856                                 /* cleanup */
 857                                 if ( references ) {
 858                                         ber_memvfree( (void **)references );
 859                                 }
 860
 861                                 if ( rs->sr_ctrls ) {
 862                                         ldap_controls_free( rs->sr_ctrls );
 863                                         rs->sr_ctrls = NULL;
 864                                 }
 865
 866                         } else if ( rc == LDAP_RES_SEARCH_RESULT ) {
 867                                 char            buf[ SLAP_TEXT_BUFLEN ];
 868                                 char            **references = NULL;
 869
 870                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 871                                         /* don't retry any more... */
 872                                         candidates[ i ].sr_type = REP_RESULT;
 873                                 }
 874
 875                                 /* NOTE: ignores response controls
 876                                  * (and intermediate response controls
 877                                  * as well, except for those with search
 878                                  * references); this may not be correct,
 879                                  * but if they're not ignored then
 880                                  * back-meta would need to merge them
 881                                  * consistently (think of pagedResults...)
 882                                  */
 883                                 rs->sr_err = ldap_parse_result( msc->msc_ld,
 884                                                         res,
 885                                                         &candidates[ i ].sr_err,
 886                                                         (char **)&candidates[ i ].sr_matched,
 887                                                         NULL /* (char **)&candidates[ i ].sr_text */ ,
 888                                                         &references,
 889                                                         NULL /* &candidates[ i ].sr_ctrls (unused) */ ,
 890                                                         1 );
 891                                 res = NULL;
 892                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 893                                         ldap_get_option( msc->msc_ld,
 894                                                         LDAP_OPT_ERROR_NUMBER,
 895                                                         &rs->sr_err );
 896                                         sres = slap_map_api2result( rs );
 897                                         candidates[ i ].sr_type = REP_RESULT;
 898                                         goto really_bad;
 899                                 }
 900
 901                                 /* massage matchedDN if need be */
 902                                 if ( candidates[ i ].sr_matched != NULL ) {
 903                                         struct berval   match, mmatch;
 904
 905                                         ber_str2bv( candidates[ i ].sr_matched,
 906                                                 0, 0, &match );
 907                                         candidates[ i ].sr_matched = NULL;
 908
 909                                         dc.ctx = "matchedDN";
 910                                         dc.target = mi->mi_targets[ i ];
 911                                         if ( !ldap_back_dn_massage( &dc, &match, &mmatch ) ) {
 912                                                 if ( mmatch.bv_val == match.bv_val ) {
 913                                                         candidates[ i ].sr_matched = ch_strdup( mmatch.bv_val );
 914
 915                                                 } else {
 916                                                         candidates[ i ].sr_matched = mmatch.bv_val;
 917                                                 }
 918
 919                                                 candidate_match++;
 920                                         }
 921                                         ldap_memfree( match.bv_val );
 922                                 }
 923
 924                                 /* add references to array */
 925                                 if ( references ) {
 926                                         BerVarray       sr_ref;
 927                                         int             cnt;
 928
 929                                         for ( cnt = 0; references[ cnt ]; cnt++ )
 930                                                 ;
 931
 932                                         sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
 933
 934                                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
 935                                                 ber_str2bv( references[ cnt ], 0, 1, &sr_ref[ cnt ] );
 936                                         }
 937                                         BER_BVZERO( &sr_ref[ cnt ] );
 938
 939                                         ( void )ldap_back_referral_result_rewrite( &dc, sr_ref );
 940
 941                                         /* cleanup */
 942                                         ber_memvfree( (void **)references );
 943
 944                                         if ( rs->sr_v2ref == NULL ) {
 945                                                 rs->sr_v2ref = sr_ref;
 946
 947                                         } else {
 948                                                 for ( cnt = 0; !BER_BVISNULL( &sr_ref[ cnt ] ); cnt++ ) {
 949                                                         ber_bvarray_add( &rs->sr_v2ref, &sr_ref[ cnt ] );
 950                                                 }
 951                                                 ber_memfree( sr_ref );
 952                                         }
 953                                 }
 954
 955                                 rs->sr_err = candidates[ i ].sr_err;
 956                                 sres = slap_map_api2result( rs );
 957
 958                                 if ( LogTest( LDAP_DEBUG_TRACE | LDAP_DEBUG_ANY ) ) {
 959                                         snprintf( buf, sizeof( buf ),
 960                                                 "%s meta_back_search[%ld] "
 961                                                 "match=\"%s\" err=%ld",
 962                                                 op->o_log_prefix, i,
 963                                                 candidates[ i ].sr_matched ? candidates[ i ].sr_matched : "",
 964                                                 (long) candidates[ i ].sr_err );
 965                                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
 966                                                 Debug( LDAP_DEBUG_TRACE, "%s.\n", buf, 0, 0 );
 967
 968                                         } else {
 969                                                 Debug( LDAP_DEBUG_ANY, "%s (%s).\n",
 970                                                         buf, ldap_err2string( candidates[ i ].sr_err ), 0 );
 971                                         }
 972                                 }
 973
 974                                 switch ( sres ) {
 975                                 case LDAP_NO_SUCH_OBJECT:
 976                                         /* is_ok is touched any time a valid
 977                                          * (even intermediate) result is
 978                                          * returned; as a consequence, if
 979                                          * a candidate returns noSuchObject
 980                                          * it is ignored and the candidate
 981                                          * is simply demoted. */
 982                                         if ( is_ok ) {
 983                                                 sres = LDAP_SUCCESS;
 984                                         }
 985                                         break;
 986
 987                                 case LDAP_SUCCESS:
 988                                 case LDAP_REFERRAL:
 989                                         is_ok++;
 990                                         break;
 991
 992                                 case LDAP_SIZELIMIT_EXCEEDED:
 993                                         /* if a target returned sizelimitExceeded
 994                                          * and the entry count is equal to the
 995                                          * proxy's limit, the target would have
 996                                          * returned more, and the error must be
 997                                          * propagated to the client; otherwise,
 998                                          * the target enforced a limit lower
 999                                          * than what requested by the proxy;
1000                                          * ignore it */
1001                                         if ( rs->sr_nentries == op->ors_slimit
1002                                                 || META_BACK_ONERR_STOP( mi ) )
1003                                         {
1004                                                 savepriv = op->o_private;
1005                                                 op->o_private = (void *)i;
1006                                                 send_ldap_result( op, rs );
1007                                                 op->o_private = savepriv;
1008                                                 goto finish;
1009                                         }
1010                                         break;
1011
1012                                 default:
1013                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1014                                                 savepriv = op->o_private;
1015                                                 op->o_private = (void *)i;
1016                                                 send_ldap_result( op, rs );
1017                                                 op->o_private = savepriv;
1018                                                 goto finish;
1019                                         }
1020                                         break;
1021                                 }
1022
1023                                 last = i;
1024                                 rc = 0;
1025
1026                                 /*
1027                                  * When no candidates are left,
1028                                  * the outer cycle finishes
1029                                  */
1030                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1031                                 --ncandidates;
1032
1033                         } else if ( rc == LDAP_RES_BIND ) {
1034                                 meta_search_candidate_t retcode;
1035
1036                                 retcode = meta_search_dobind_result( op, rs, &mc, i, candidates, res );
1037                                 if ( retcode == META_SEARCH_CANDIDATE ) {
1038                                         retcode = meta_back_search_start( op, rs, &dc, &mc, i, candidates );
1039                                 }
1040
1041                                 switch ( retcode ) {
1042                                 case META_SEARCH_CANDIDATE:
1043                                         goto get_result;
1044
1045                                         /* means that failed but onerr == continue */
1046                                 case META_SEARCH_NOT_CANDIDATE:
1047                                 case META_SEARCH_ERR:
1048                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1049                                         --ncandidates;
1050
1051                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1052                                                 savepriv = op->o_private;
1053                                                 op->o_private = (void *)i;
1054                                                 send_ldap_result( op, rs );
1055                                                 op->o_private = savepriv;
1056                                                 goto finish;
1057                                         }
1058                                         break;
1059
1060                                 default:
1061                                         assert( 0 );
1062                                         break;
1063                                 }
1064
1065                         } else {
1066                                 assert( 0 );
1067                                 goto really_bad;
1068                         }
1069                 }
1070
1071                 /* check for abandon */
1072                 if ( op->o_abandon || doabandon ) {
1073                         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1074                                 if ( candidates[ i ].sr_msgid != META_MSGID_IGNORE )
1075                                 {
1076                                         (void)meta_back_cancel( mc, op, rs,
1077                                                 candidates[ i ].sr_msgid, i,
1078                                                 LDAP_BACK_DONTSEND );
1079                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1080                                 }
1081                         }
1082
1083                         if ( op->o_abandon ) {
1084                                 rc = SLAPD_ABANDON;
1085                                 goto finish;
1086                         }
1087                 }
1088
1089                 /* if no entry was found during this loop,
1090                  * set a minimal timeout */
1091                 if ( gotit == 0 ) {
1092                         /* make the entire wait last
1093                          * LDAP_BACK_RESULT_UTIMEOUT at worst */
1094                         tv.tv_sec = 0;
1095                         tv.tv_usec = LDAP_BACK_RESULT_UTIMEOUT/initial_candidates;
1096                         ldap_pvt_thread_yield();
1097                 }
1098         }
1099
1100         if ( rc == -1 ) {
1101                 /*
1102                  * FIXME: need a better strategy to handle errors
1103                  */
1104                 if ( mc ) {
1105                         rc = meta_back_op_result( mc, op, rs, META_TARGET_NONE );
1106                 } else {
1107                         rc = rs->sr_err;
1108                 }
1109                 goto finish;
1110         }
1111
1112         /*
1113          * Rewrite the matched portion of the search base, if required
1114          *
1115          * FIXME: only the last one gets caught!
1116          */
1117         savepriv = op->o_private;
1118         op->o_private = (void *)(long)mi->mi_ntargets;
1119         if ( candidate_match > 0 ) {
1120                 struct berval   pmatched = BER_BVNULL;
1121
1122                 /* we use the first one */
1123                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1124                         if ( candidates[ i ].sr_tag == META_CANDIDATE
1125                                         && candidates[ i ].sr_matched != NULL )
1126                         {
1127                                 struct berval   bv, pbv;
1128                                 int             rc;
1129
1130                                 /* if we got success, and this target
1131                                  * returned noSuchObject, and its suffix
1132                                  * is a superior of the searchBase,
1133                                  * ignore the matchedDN */
1134                                 if ( sres == LDAP_SUCCESS
1135                                         && candidates[ i ].sr_err == LDAP_NO_SUCH_OBJECT
1136                                         && op->o_req_ndn.bv_len > mi->mi_targets[ i ]->mt_nsuffix.bv_len )
1137                                 {
1138                                         free( (char *)candidates[ i ].sr_matched );
1139                                         candidates[ i ].sr_matched = NULL;
1140                                         continue;
1141                                 }
1142
1143                                 ber_str2bv( candidates[ i ].sr_matched, 0, 0, &bv );
1144                                 rc = dnPretty( NULL, &bv, &pbv, op->o_tmpmemctx );
1145
1146                                 if ( rc == LDAP_SUCCESS ) {
1147
1148                                         /* NOTE: if they all are superiors
1149                                          * of the baseDN, the shorter is also
1150                                          * superior of the longer... */
1151                                         if ( pbv.bv_len > pmatched.bv_len ) {
1152                                                 if ( !BER_BVISNULL( &pmatched ) ) {
1153                                                         op->o_tmpfree( pmatched.bv_val, op->o_tmpmemctx );
1154                                                 }
1155                                                 pmatched = pbv;
1156                                                 op->o_private = (void *)i;
1157
1158                                         } else {
1159                                                 op->o_tmpfree( pbv.bv_val, op->o_tmpmemctx );
1160                                         }
1161                                 }
1162
1163                                 if ( candidates[ i ].sr_matched != NULL ) {
1164                                         free( (char *)candidates[ i ].sr_matched );
1165                                         candidates[ i ].sr_matched = NULL;
1166                                 }
1167                         }
1168                 }
1169
1170                 if ( !BER_BVISNULL( &pmatched ) ) {
1171                         matched = pmatched.bv_val;
1172                 }
1173
1174         } else if ( sres == LDAP_NO_SUCH_OBJECT ) {
1175                 matched = op->o_bd->be_suffix[ 0 ].bv_val;
1176         }
1177
1178 #if 0
1179         {
1180                 char    buf[BUFSIZ];
1181                 char    cnd[BUFSIZ];
1182                 int     i;
1183
1184                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1185                         if ( candidates[ i ].sr_tag == META_CANDIDATE ) {
1186                                 cnd[ i ] = '*';
1187                         } else {
1188                                 cnd[ i ] = ' ';
1189                         }
1190                 }
1191                 cnd[ i ] = '\0';
1192
1193                 snprintf( buf, sizeof( buf ), "%s meta_back_search: is_scope=%d is_ok=%d cnd=\"%s\"\n",
1194                         op->o_log_prefix, initial_candidates, is_ok, cnd );
1195
1196                 Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
1197         }
1198 #endif
1199
1200         /*
1201          * In case we returned at least one entry, we return LDAP_SUCCESS
1202          * otherwise, the latter error code we got
1203          *
1204          * FIXME: we should handle error codes and return the more
1205          * important/reasonable
1206          */
1207
1208         if ( sres == LDAP_SUCCESS && rs->sr_v2ref ) {
1209                 sres = LDAP_REFERRAL;
1210         }
1211         rs->sr_err = sres;
1212         rs->sr_matched = matched;
1213         rs->sr_ref = ( sres == LDAP_REFERRAL ? rs->sr_v2ref : NULL );
1214         send_ldap_result( op, rs );
1215         op->o_private = savepriv;
1216         rs->sr_matched = NULL;
1217         rs->sr_ref = NULL;
1218
1219 finish:;
1220         if ( matched && matched != op->o_bd->be_suffix[ 0 ].bv_val ) {
1221                 op->o_tmpfree( matched, op->o_tmpmemctx );
1222         }
1223
1224         if ( rs->sr_v2ref ) {
1225                 ber_bvarray_free( rs->sr_v2ref );
1226         }
1227
1228         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1229                 if ( candidates[ i ].sr_tag != META_CANDIDATE ) {
1230                         continue;
1231                 }
1232
1233                 if ( mc && candidates[ i ].sr_msgid >= 0 ) {
1234                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1235                         if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ) {
1236                                 LDAP_BACK_CONN_BINDING_CLEAR( &mc->mc_conns[ i ] );
1237                         }
1238                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1239                 }
1240
1241                 if ( candidates[ i ].sr_matched ) {
1242                         free( (char *)candidates[ i ].sr_matched );
1243                         candidates[ i ].sr_matched = NULL;
1244                 }
1245
1246                 if ( candidates[ i ].sr_text ) {
1247                         ldap_memfree( (char *)candidates[ i ].sr_text );
1248                         candidates[ i ].sr_text = NULL;
1249                 }
1250
1251                 if ( candidates[ i ].sr_ref ) {
1252                         ber_bvarray_free( candidates[ i ].sr_ref );
1253                         candidates[ i ].sr_ref = NULL;
1254                 }
1255
1256                 if ( candidates[ i ].sr_ctrls ) {
1257                         ldap_controls_free( candidates[ i ].sr_ctrls );
1258                         candidates[ i ].sr_ctrls = NULL;
1259                 }
1260
1261                 if ( META_BACK_QUARANTINE( mi ) ) {
1262                         meta_back_quarantine( op, &candidates[ i ], i, 1 );
1263                 }
1264         }
1265
1266         if ( mc ) {
1267                 meta_back_release_conn( op, mc );
1268         }
1269
1270         return rs->sr_err;
1271 }
1272
1273 static int
1274 meta_send_entry(
1275         Operation       *op,
1276         SlapReply       *rs,
1277         metaconn_t      *mc,
1278         int             target,
1279         LDAPMessage     *e )
1280 {
1281         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
1282         struct berval           a, mapped;
1283         Entry                   ent = { 0 };
1284         BerElement              ber = *e->lm_ber;
1285         Attribute               *attr, **attrp;
1286         struct berval           bdn,
1287                                 dn = BER_BVNULL;
1288         const char              *text;
1289         dncookie                dc;
1290         int                     rc;
1291
1292         if ( ber_scanf( &ber, "{m{", &bdn ) == LBER_ERROR ) {
1293                 return LDAP_DECODING_ERROR;
1294         }
1295
1296         /*
1297          * Rewrite the dn of the result, if needed
1298          */
1299         dc.target = mi->mi_targets[ target ];
1300         dc.conn = op->o_conn;
1301         dc.rs = rs;
1302         dc.ctx = "searchResult";
1303
1304         rs->sr_err = ldap_back_dn_massage( &dc, &bdn, &dn );
1305         if ( rs->sr_err != LDAP_SUCCESS) {
1306                 return rs->sr_err;
1307         }
1308
1309         /*
1310          * Note: this may fail if the target host(s) schema differs
1311          * from the one known to the meta, and a DN with unknown
1312          * attributes is returned.
1313          *
1314          * FIXME: should we log anything, or delegate to dnNormalize?
1315          */
1316         rc = dnPrettyNormal( NULL, &dn, &ent.e_name, &ent.e_nname,
1317                 op->o_tmpmemctx );
1318         if ( dn.bv_val != bdn.bv_val ) {
1319                 free( dn.bv_val );
1320         }
1321         BER_BVZERO( &dn );
1322
1323         if ( rc != LDAP_SUCCESS ) {
1324                 return LDAP_INVALID_DN_SYNTAX;
1325         }
1326
1327         /*
1328          * cache dn
1329          */
1330         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1331                 ( void )meta_dncache_update_entry( &mi->mi_cache,
1332                                 &ent.e_nname, target );
1333         }
1334
1335         attrp = &ent.e_attrs;
1336
1337         dc.ctx = "searchAttrDN";
1338         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
1339                 int                             last = 0;
1340                 slap_syntax_validate_func       *validate;
1341                 slap_syntax_transform_func      *pretty;
1342
1343                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_at,
1344                                 &a, &mapped, BACKLDAP_REMAP );
1345                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0' ) {
1346                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1347                         continue;
1348                 }
1349                 attr = ( Attribute * )ch_calloc( 1, sizeof( Attribute ) );
1350                 if ( attr == NULL ) {
1351                         continue;
1352                 }
1353                 if ( slap_bv2ad( &mapped, &attr->a_desc, &text )
1354                                 != LDAP_SUCCESS) {
1355                         if ( slap_bv2undef_ad( &mapped, &attr->a_desc, &text,
1356                                 SLAP_AD_PROXIED ) != LDAP_SUCCESS )
1357                         {
1358                                 char    buf[ SLAP_TEXT_BUFLEN ];
1359
1360                                 snprintf( buf, sizeof( buf ),
1361                                         "%s meta_send_entry(\"%s\"): "
1362                                         "slap_bv2undef_ad(%s): %s\n",
1363                                         op->o_log_prefix, ent.e_name.bv_val,
1364                                         mapped.bv_val, text );
1365
1366                                 Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
1367                                 ch_free( attr );
1368                                 continue;
1369                         }
1370                 }
1371
1372                 /* no subschemaSubentry */
1373                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
1374                         || attr->a_desc == slap_schema.si_ad_entryDN )
1375                 {
1376
1377                         /*
1378                          * We eat target's subschemaSubentry because
1379                          * a search for this value is likely not
1380                          * to resolve to the appropriate backend;
1381                          * later, the local subschemaSubentry is
1382                          * added.
1383                          *
1384                          * We also eat entryDN because the frontend
1385                          * will reattach it without checking if already
1386                          * present...
1387                          */
1388                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1389
1390                         ch_free(attr);
1391                         continue;
1392                 }
1393
1394                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
1395                                 || attr->a_vals == NULL )
1396                 {
1397                         attr->a_vals = (struct berval *)&slap_dummy_bv;
1398
1399                 } else {
1400                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); ++last )
1401                                 ;
1402                 }
1403
1404                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
1405                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
1406
1407                 if ( !validate && !pretty ) {
1408                         attr_free( attr );
1409                         goto next_attr;
1410                 }
1411
1412                 if ( attr->a_desc == slap_schema.si_ad_objectClass
1413                                 || attr->a_desc == slap_schema.si_ad_structuralObjectClass )
1414                 {
1415                         struct berval   *bv;
1416
1417                         for ( bv = attr->a_vals; !BER_BVISNULL( bv ); bv++ ) {
1418                                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_oc,
1419                                                 bv, &mapped, BACKLDAP_REMAP );
1420                                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0') {
1421                                         free( bv->bv_val );
1422                                         BER_BVZERO( bv );
1423                                         if ( --last < 0 ) {
1424                                                 break;
1425                                         }
1426                                         *bv = attr->a_vals[ last ];
1427                                         BER_BVZERO( &attr->a_vals[ last ] );
1428                                         bv--;
1429
1430                                 } else if ( mapped.bv_val != bv->bv_val ) {
1431                                         free( bv->bv_val );
1432                                         ber_dupbv( bv, &mapped );
1433                                 }
1434                         }
1435                 /*
1436                  * It is necessary to try to rewrite attributes with
1437                  * dn syntax because they might be used in ACLs as
1438                  * members of groups; since ACLs are applied to the
1439                  * rewritten stuff, no dn-based subecj clause could
1440                  * be used at the ldap backend side (see
1441                  * http://www.OpenLDAP.org/faq/data/cache/452.html)
1442                  * The problem can be overcome by moving the dn-based
1443                  * ACLs to the target directory server, and letting
1444                  * everything pass thru the ldap backend.
1445                  */
1446                 } else {
1447                         int     i;
1448
1449                         if ( attr->a_desc->ad_type->sat_syntax ==
1450                                 slap_schema.si_syn_distinguishedName )
1451                         {
1452                                 ldap_dnattr_result_rewrite( &dc, attr->a_vals );
1453
1454                         } else if ( attr->a_desc == slap_schema.si_ad_ref ) {
1455                                 ldap_back_referral_result_rewrite( &dc, attr->a_vals );
1456
1457                         }
1458
1459                         for ( i = 0; i < last; i++ ) {
1460                                 struct berval   pval;
1461                                 int             rc;
1462
1463                                 if ( pretty ) {
1464                                         rc = pretty( attr->a_desc->ad_type->sat_syntax,
1465                                                 &attr->a_vals[i], &pval, NULL );
1466
1467                                 } else {
1468                                         rc = validate( attr->a_desc->ad_type->sat_syntax,
1469                                                 &attr->a_vals[i] );
1470                                 }
1471
1472                                 if ( rc ) {
1473                                         LBER_FREE( attr->a_vals[i].bv_val );
1474                                         if ( --last == i ) {
1475                                                 BER_BVZERO( &attr->a_vals[ i ] );
1476                                                 break;
1477                                         }
1478                                         attr->a_vals[i] = attr->a_vals[last];
1479                                         BER_BVZERO( &attr->a_vals[last] );
1480                                         i--;
1481                                         continue;
1482                                 }
1483
1484                                 if ( pretty ) {
1485                                         LBER_FREE( attr->a_vals[i].bv_val );
1486                                         attr->a_vals[i] = pval;
1487                                 }
1488                         }
1489
1490                         if ( last == 0 && attr->a_vals != &slap_dummy_bv ) {
1491                                 attr_free( attr );
1492                                 goto next_attr;
1493                         }
1494                 }
1495
1496                 if ( last && attr->a_desc->ad_type->sat_equality &&
1497                         attr->a_desc->ad_type->sat_equality->smr_normalize )
1498                 {
1499                         int i;
1500
1501                         attr->a_nvals = ch_malloc( ( last + 1 ) * sizeof( struct berval ) );
1502                         for ( i = 0; i<last; i++ ) {
1503                                 attr->a_desc->ad_type->sat_equality->smr_normalize(
1504                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
1505                                         attr->a_desc->ad_type->sat_syntax,
1506                                         attr->a_desc->ad_type->sat_equality,
1507                                         &attr->a_vals[i], &attr->a_nvals[i],
1508                                         NULL );
1509                         }
1510                         BER_BVZERO( &attr->a_nvals[i] );
1511
1512                 } else {
1513                         attr->a_nvals = attr->a_vals;
1514                 }
1515
1516                 *attrp = attr;
1517                 attrp = &attr->a_next;
1518 next_attr:;
1519         }
1520         rs->sr_entry = &ent;
1521         rs->sr_attrs = op->ors_attrs;
1522         rs->sr_flags = 0;
1523         rs->sr_err = LDAP_SUCCESS;
1524         rc = send_search_entry( op, rs );
1525         switch ( rc ) {
1526         case LDAP_UNAVAILABLE:
1527                 rc = LDAP_OTHER;
1528                 break;
1529         }
1530         rs->sr_entry = NULL;
1531         rs->sr_attrs = NULL;
1532
1533         if ( !BER_BVISNULL( &ent.e_name ) ) {
1534                 free( ent.e_name.bv_val );
1535                 BER_BVZERO( &ent.e_name );
1536         }
1537         if ( !BER_BVISNULL( &ent.e_nname ) ) {
1538                 free( ent.e_nname.bv_val );
1539                 BER_BVZERO( &ent.e_nname );
1540         }
1541         entry_clean( &ent );
1542
1543         return rc;
1544 }
1545