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