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         assert( msc->msc_ld != NULL );
  97
  98         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
  99         if ( LDAP_BACK_CONN_ISBOUND( msc ) || LDAP_BACK_CONN_ISANON( msc ) ) {
 100                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 101                 return META_SEARCH_CANDIDATE;
 102         }
 103
 104         if ( LDAP_BACK_CONN_BINDING( msc ) ) {
 105                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 106                 candidates[ candidate ].sr_msgid = META_MSGID_NEED_BIND;
 107                 return META_SEARCH_NEED_BIND;
 108         }
 109
 110         LDAP_BACK_CONN_BINDING_SET( msc );
 111         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 112
 113         if ( be_isroot( op ) && !BER_BVISNULL( &mt->mt_pseudorootdn ) ) {
 114                 binddn = mt->mt_pseudorootdn.bv_val;
 115                 cred = mt->mt_pseudorootpw;
 116         }
 117
 118         /*
 119          * Otherwise an anonymous bind is performed
 120          * (note: if the target was already bound, the anonymous
 121          * bind clears the previous bind).
 122          */
 123         if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) {
 124                 ber_memfree( msc->msc_bound_ndn.bv_val );
 125                 BER_BVZERO( &msc->msc_bound_ndn );
 126         }
 127
 128         if ( LDAP_BACK_SAVECRED( mi ) && !BER_BVISNULL( &msc->msc_cred ) ) {
 129                 /* destroy sensitive data */
 130                 memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len );
 131                 ber_memfree( msc->msc_cred.bv_val );
 132                 BER_BVZERO( &msc->msc_cred );
 133         }
 134
 135 retry:;
 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          rc = ldap_parse_result( msc->msc_ld, res,
 196                 &candidates[ candidate ].sr_err,
 197                 NULL, NULL, NULL, NULL, 1 );
 198         if ( rc == LDAP_SUCCESS ) {
 199                 rc = slap_map_api2result( &candidates[ candidate ] );
 200         }
 201
 202         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 203         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 204         if ( rc != LDAP_SUCCESS ) {
 205                 if ( META_BACK_ONERR_STOP( mi ) ) {
 206                         LDAP_BACK_CONN_TAINTED_SET( mc );
 207                         meta_back_release_conn( op, mc );
 208                         *mcp = NULL;
 209                         retcode = META_SEARCH_ERR;
 210                 }
 211
 212         } else {
 213                 if ( be_isroot( op ) ) {
 214                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 215                 } else {
 216                         LDAP_BACK_CONN_ISANON_SET( msc );
 217                 }
 218                 retcode = META_SEARCH_CANDIDATE;
 219         }
 220         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 221
 222         return retcode;
 223 }
 224
 225 static meta_search_candidate_t
 226 meta_back_search_start(
 227         Operation               *op,
 228         SlapReply               *rs,
 229         dncookie                *dc,
 230         metaconn_t              **mcp,
 231         int                     candidate,
 232         SlapReply               *candidates )
 233 {
 234         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 235         metatarget_t            *mt = mi->mi_targets[ candidate ];
 236         metaconn_t              *mc = *mcp;
 237         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 238         struct berval           realbase = op->o_req_dn;
 239         int                     realscope = op->ors_scope;
 240         ber_len_t               suffixlen = 0;
 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         /* should we check return values? */
 252         if ( op->ors_deref != -1 ) {
 253                 ldap_set_option( msc->msc_ld, LDAP_OPT_DEREF,
 254                                 ( void * )&op->ors_deref );
 255         }
 256
 257         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 258                 tv.tv_sec = op->ors_tlimit > 0 ? op->ors_tlimit : 1;
 259                 tv.tv_usec = 0;
 260                 tvp = &tv;
 261         }
 262
 263         dc->target = mt;
 264
 265         /*
 266          * modifies the base according to the scope, if required
 267          */
 268         suffixlen = mt->mt_nsuffix.bv_len;
 269         if ( suffixlen > op->o_req_ndn.bv_len ) {
 270                 switch ( op->ors_scope ) {
 271                 case LDAP_SCOPE_SUBTREE:
 272                         /*
 273                          * make the target suffix the new base
 274                          * FIXME: this is very forgiving, because
 275                          * "illegal" searchBases may be turned
 276                          * into the suffix of the target; however,
 277                          * the requested searchBase already passed
 278                          * thru the candidate analyzer...
 279                          */
 280                         if ( dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) ) {
 281                                 realbase = mt->mt_nsuffix;
 282                                 if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 283                                         realscope = LDAP_SCOPE_SUBORDINATE;
 284                                 }
 285
 286                         } else {
 287                                 /*
 288                                  * this target is no longer candidate
 289                                  */
 290                                 return META_SEARCH_NOT_CANDIDATE;
 291                         }
 292                         break;
 293
 294                 case LDAP_SCOPE_SUBORDINATE:
 295                 case LDAP_SCOPE_ONELEVEL:
 296                 {
 297                         struct berval   rdn = mt->mt_nsuffix;
 298                         rdn.bv_len -= op->o_req_ndn.bv_len + STRLENOF( "," );
 299                         if ( dnIsOneLevelRDN( &rdn )
 300                                         && dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) )
 301                         {
 302                                 /*
 303                                  * if there is exactly one level,
 304                                  * make the target suffix the new
 305                                  * base, and make scope "base"
 306                                  */
 307                                 realbase = mt->mt_nsuffix;
 308                                 if ( op->ors_scope == LDAP_SCOPE_SUBORDINATE ) {
 309                                         if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 310                                                 realscope = LDAP_SCOPE_SUBORDINATE;
 311                                         } else {
 312                                                 realscope = LDAP_SCOPE_SUBTREE;
 313                                         }
 314                                 } else {
 315                                         realscope = LDAP_SCOPE_BASE;
 316                                 }
 317                                 break;
 318                         } /* else continue with the next case */
 319                 }
 320
 321                 case LDAP_SCOPE_BASE:
 322                         /*
 323                          * this target is no longer candidate
 324                          */
 325                         return META_SEARCH_NOT_CANDIDATE;
 326                 }
 327         }
 328
 329         /* initiate dobind */
 330         retcode = meta_search_dobind_init( op, rs, mcp, candidate, candidates );
 331
 332         Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%d]=%d\n", op->o_log_prefix, candidate, retcode );
 333
 334         if ( retcode != META_SEARCH_CANDIDATE ) {
 335                 return retcode;
 336         }
 337
 338         /*
 339          * Rewrite the search base, if required
 340          */
 341         dc->ctx = "searchBase";
 342         switch ( ldap_back_dn_massage( dc, &realbase, &mbase ) ) {
 343         default:
 344                 break;
 345
 346         case REWRITE_REGEXEC_UNWILLING:
 347                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 348                 rs->sr_text = "Operation not allowed";
 349                 send_ldap_result( op, rs );
 350                 return META_SEARCH_ERR;
 351
 352         case REWRITE_REGEXEC_ERR:
 353
 354                 /*
 355                  * this target is no longer candidate
 356                  */
 357                 return META_SEARCH_NOT_CANDIDATE;
 358         }
 359
 360         /*
 361          * Maps filter
 362          */
 363         rc = ldap_back_filter_map_rewrite( dc, op->ors_filter,
 364                         &mfilter, BACKLDAP_MAP );
 365         switch ( rc ) {
 366         case LDAP_SUCCESS:
 367                 break;
 368
 369         case LDAP_COMPARE_FALSE:
 370         default:
 371                 /*
 372                  * this target is no longer candidate
 373                  */
 374                 retcode = META_SEARCH_NOT_CANDIDATE;
 375                 goto done;
 376         }
 377
 378         /*
 379          * Maps required attributes
 380          */
 381         rc = ldap_back_map_attrs( &mt->mt_rwmap.rwm_at,
 382                         op->ors_attrs, BACKLDAP_MAP, &mapped_attrs );
 383         if ( rc != LDAP_SUCCESS ) {
 384                 /*
 385                  * this target is no longer candidate
 386                  */
 387                 retcode = META_SEARCH_NOT_CANDIDATE;
 388                 goto done;
 389         }
 390
 391         /*
 392          * Starts the search
 393          */
 394 retry:;
 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 = LDAP_OTHER;
 739                                 rs->sr_text = "remote server unavailable";
 740
 741                         } else if ( rc == LDAP_RES_SEARCH_ENTRY ) {
 742                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 743                                         /* don't retry any more... */
 744                                         candidates[ i ].sr_type = REP_RESULT;
 745                                 }
 746
 747                                 is_ok++;
 748
 749                                 e = ldap_first_entry( msc->msc_ld, res );
 750                                 savepriv = op->o_private;
 751                                 op->o_private = (void *)i;
 752                                 rs->sr_err = meta_send_entry( op, rs, mc, i, e );
 753                                 ldap_msgfree( res );
 754                                 res = NULL;
 755
 756                                 switch ( rs->sr_err ) {
 757                                 case LDAP_SIZELIMIT_EXCEEDED:
 758                                         savepriv = op->o_private;
 759                                         op->o_private = (void *)i;
 760                                         send_ldap_result( op, rs );
 761                                         op->o_private = savepriv;
 762                                         rs->sr_err = LDAP_SUCCESS;
 763                                         goto finish;
 764
 765                                 case LDAP_UNAVAILABLE:
 766                                         rs->sr_err = LDAP_OTHER;
 767                                         goto finish;
 768                                 }
 769                                 op->o_private = savepriv;
 770
 771                                 /* don't wait any longer... */
 772                                 gotit = 1;
 773                                 tv.tv_sec = 0;
 774                                 tv.tv_usec = 0;
 775
 776 #if 0
 777                                 /*
 778                                  * If scope is BASE, we need to jump out
 779                                  * as soon as one entry is found; if
 780                                  * the target pool is properly crafted,
 781                                  * this should correspond to the sole
 782                                  * entry that has the base DN
 783                                  */
 784                                 /* FIXME: this defeats the purpose of
 785                                  * doing a search with scope == base and
 786                                  * sizelimit = 1 to determine if a
 787                                  * candidate is actually unique */
 788                                 if ( op->ors_scope == LDAP_SCOPE_BASE
 789                                                 && rs->sr_nentries > 0 )
 790                                 {
 791                                         doabandon = 1;
 792                                         ncandidates = 0;
 793                                         sres = LDAP_SUCCESS;
 794                                         break;
 795                                 }
 796 #endif
 797
 798                         } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
 799                                 char            **references = NULL;
 800                                 int             cnt;
 801
 802                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 803                                         /* don't retry any more... */
 804                                         candidates[ i ].sr_type = REP_RESULT;
 805                                 }
 806
 807                                 is_ok++;
 808
 809                                 rc = ldap_parse_reference( msc->msc_ld, res,
 810                                                 &references, &rs->sr_ctrls, 1 );
 811                                 res = NULL;
 812
 813                                 if ( rc != LDAP_SUCCESS ) {
 814                                         continue;
 815                                 }
 816
 817                                 if ( references == NULL ) {
 818                                         continue;
 819                                 }
 820
 821 #ifdef ENABLE_REWRITE
 822                                 dc.ctx = "referralDN";
 823 #else /* ! ENABLE_REWRITE */
 824                                 dc.tofrom = 0;
 825                                 dc.normalized = 0;
 826 #endif /* ! ENABLE_REWRITE */
 827
 828                                 /* FIXME: merge all and return at the end */
 829
 830                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 831                                         ;
 832
 833                                 rs->sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
 834
 835                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 836                                         ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
 837                                 }
 838                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 839
 840                                 ( void )ldap_back_referral_result_rewrite( &dc, rs->sr_ref );
 841
 842                                 if ( rs->sr_ref != NULL && !BER_BVISNULL( &rs->sr_ref[ 0 ] ) ) {
 843                                         /* ignore return value by now */
 844                                         savepriv = op->o_private;
 845                                         op->o_private = (void *)i;
 846                                         ( void )send_search_reference( op, rs );
 847                                         op->o_private = savepriv;
 848
 849                                         ber_bvarray_free( rs->sr_ref );
 850                                         rs->sr_ref = NULL;
 851                                 }
 852
 853                                 /* cleanup */
 854                                 if ( references ) {
 855                                         ber_memvfree( (void **)references );
 856                                 }
 857
 858                                 if ( rs->sr_ctrls ) {
 859                                         ldap_controls_free( rs->sr_ctrls );
 860                                         rs->sr_ctrls = NULL;
 861                                 }
 862
 863                         } else if ( rc == LDAP_RES_SEARCH_RESULT ) {
 864                                 char            buf[ SLAP_TEXT_BUFLEN ];
 865                                 char            **references = NULL;
 866
 867                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 868                                         /* don't retry any more... */
 869                                         candidates[ i ].sr_type = REP_RESULT;
 870                                 }
 871
 872                                 /* NOTE: ignores response controls
 873                                  * (and intermediate response controls
 874                                  * as well, except for those with search
 875                                  * references); this may not be correct,
 876                                  * but if they're not ignored then
 877                                  * back-meta would need to merge them
 878                                  * consistently (think of pagedResults...)
 879                                  */
 880                                 rs->sr_err = ldap_parse_result( msc->msc_ld,
 881                                                         res,
 882                                                         &candidates[ i ].sr_err,
 883                                                         (char **)&candidates[ i ].sr_matched,
 884                                                         NULL /* (char **)&candidates[ i ].sr_text */ ,
 885                                                         &references,
 886                                                         NULL /* &candidates[ i ].sr_ctrls (unused) */ ,
 887                                                         1 );
 888                                 res = NULL;
 889                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 890                                         ldap_get_option( msc->msc_ld,
 891                                                         LDAP_OPT_ERROR_NUMBER,
 892                                                         &rs->sr_err );
 893                                         sres = slap_map_api2result( rs );
 894                                         candidates[ i ].sr_type = REP_RESULT;
 895                                         goto really_bad;
 896                                 }
 897
 898                                 /* massage matchedDN if need be */
 899                                 if ( candidates[ i ].sr_matched != NULL ) {
 900                                         struct berval   match, mmatch;
 901
 902                                         ber_str2bv( candidates[ i ].sr_matched,
 903                                                 0, 0, &match );
 904                                         candidates[ i ].sr_matched = NULL;
 905
 906                                         dc.ctx = "matchedDN";
 907                                         dc.target = mi->mi_targets[ i ];
 908                                         if ( !ldap_back_dn_massage( &dc, &match, &mmatch ) ) {
 909                                                 if ( mmatch.bv_val == match.bv_val ) {
 910                                                         candidates[ i ].sr_matched = ch_strdup( mmatch.bv_val );
 911
 912                                                 } else {
 913                                                         candidates[ i ].sr_matched = mmatch.bv_val;
 914                                                 }
 915
 916                                                 candidate_match++;
 917                                         }
 918                                         ldap_memfree( match.bv_val );
 919                                 }
 920
 921                                 /* add references to array */
 922                                 if ( references ) {
 923                                         BerVarray       sr_ref;
 924                                         int             cnt;
 925
 926                                         for ( cnt = 0; references[ cnt ]; cnt++ )
 927                                                 ;
 928
 929                                         sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
 930
 931                                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
 932                                                 ber_str2bv( references[ cnt ], 0, 1, &sr_ref[ cnt ] );
 933                                         }
 934                                         BER_BVZERO( &sr_ref[ cnt ] );
 935
 936                                         ( void )ldap_back_referral_result_rewrite( &dc, sr_ref );
 937
 938                                         /* cleanup */
 939                                         ber_memvfree( (void **)references );
 940
 941                                         if ( rs->sr_v2ref == NULL ) {
 942                                                 rs->sr_v2ref = sr_ref;
 943
 944                                         } else {
 945                                                 for ( cnt = 0; !BER_BVISNULL( &sr_ref[ cnt ] ); cnt++ ) {
 946                                                         ber_bvarray_add( &rs->sr_v2ref, &sr_ref[ cnt ] );
 947                                                 }
 948                                                 ber_memfree( sr_ref );
 949                                         }
 950                                 }
 951
 952                                 rs->sr_err = candidates[ i ].sr_err;
 953                                 sres = slap_map_api2result( rs );
 954
 955                                 if ( LogTest( LDAP_DEBUG_TRACE | LDAP_DEBUG_ANY ) ) {
 956                                         snprintf( buf, sizeof( buf ),
 957                                                 "%s meta_back_search[%ld] "
 958                                                 "match=\"%s\" err=%ld",
 959                                                 op->o_log_prefix, i,
 960                                                 candidates[ i ].sr_matched ? candidates[ i ].sr_matched : "",
 961                                                 (long) candidates[ i ].sr_err );
 962                                         if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
 963                                                 Debug( LDAP_DEBUG_TRACE, "%s.\n", buf, 0, 0 );
 964
 965                                         } else {
 966                                                 Debug( LDAP_DEBUG_ANY, "%s (%s).\n",
 967                                                         buf, ldap_err2string( candidates[ i ].sr_err ), 0 );
 968                                         }
 969                                 }
 970
 971                                 switch ( sres ) {
 972                                 case LDAP_NO_SUCH_OBJECT:
 973                                         /* is_ok is touched any time a valid
 974                                          * (even intermediate) result is
 975                                          * returned; as a consequence, if
 976                                          * a candidate returns noSuchObject
 977                                          * it is ignored and the candidate
 978                                          * is simply demoted. */
 979                                         if ( is_ok ) {
 980                                                 sres = LDAP_SUCCESS;
 981                                         }
 982                                         break;
 983
 984                                 case LDAP_SUCCESS:
 985                                 case LDAP_REFERRAL:
 986                                         is_ok++;
 987                                         break;
 988
 989                                 case LDAP_SIZELIMIT_EXCEEDED:
 990                                         /* if a target returned sizelimitExceeded
 991                                          * and the entry count is equal to the
 992                                          * proxy's limit, the target would have
 993                                          * returned more, and the error must be
 994                                          * propagated to the client; otherwise,
 995                                          * the target enforced a limit lower
 996                                          * than what requested by the proxy;
 997                                          * ignore it */
 998                                         if ( rs->sr_nentries == op->ors_slimit
 999                                                 || META_BACK_ONERR_STOP( mi ) )
1000                                         {
1001                                                 savepriv = op->o_private;
1002                                                 op->o_private = (void *)i;
1003                                                 send_ldap_result( op, rs );
1004                                                 op->o_private = savepriv;
1005                                                 goto finish;
1006                                         }
1007                                         break;
1008
1009                                 default:
1010                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1011                                                 savepriv = op->o_private;
1012                                                 op->o_private = (void *)i;
1013                                                 send_ldap_result( op, rs );
1014                                                 op->o_private = savepriv;
1015                                                 goto finish;
1016                                         }
1017                                         break;
1018                                 }
1019
1020                                 last = i;
1021                                 rc = 0;
1022
1023                                 /*
1024                                  * When no candidates are left,
1025                                  * the outer cycle finishes
1026                                  */
1027                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1028                                 --ncandidates;
1029
1030                         } else if ( rc == LDAP_RES_BIND ) {
1031                                 meta_search_candidate_t retcode;
1032
1033                                 retcode = meta_search_dobind_result( op, rs, &mc, i, candidates, res );
1034                                 if ( retcode == META_SEARCH_CANDIDATE ) {
1035                                         retcode = meta_back_search_start( op, rs, &dc, &mc, i, candidates );
1036                                 }
1037
1038                                 switch ( retcode ) {
1039                                 case META_SEARCH_CANDIDATE:
1040                                         goto get_result;
1041
1042                                         /* means that failed but onerr == continue */
1043                                 case META_SEARCH_NOT_CANDIDATE:
1044                                 case META_SEARCH_ERR:
1045                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1046                                         --ncandidates;
1047
1048                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1049                                                 savepriv = op->o_private;
1050                                                 op->o_private = (void *)i;
1051                                                 send_ldap_result( op, rs );
1052                                                 op->o_private = savepriv;
1053                                                 goto finish;
1054                                         }
1055                                         break;
1056
1057                                 default:
1058                                         assert( 0 );
1059                                         break;
1060                                 }
1061
1062                         } else {
1063                                 assert( 0 );
1064                                 goto really_bad;
1065                         }
1066                 }
1067
1068                 /* check for abandon */
1069                 if ( op->o_abandon || doabandon ) {
1070                         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1071                                 metasingleconn_t        *msc = &mc->mc_conns[ i ];
1072
1073                                 if ( candidates[ i ].sr_msgid != META_MSGID_IGNORE )
1074                                 {
1075                                         ldap_abandon_ext( msc->msc_ld,
1076                                                 candidates[ i ].sr_msgid,
1077                                                 NULL, NULL );
1078                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1079                                 }
1080                         }
1081
1082                         if ( op->o_abandon ) {
1083                                 rc = SLAPD_ABANDON;
1084                                 goto finish;
1085                         }
1086                 }
1087
1088                 /* if no entry was found during this loop,
1089                  * set a minimal timeout */
1090                 if ( gotit == 0 ) {
1091                         /* make the entire wait last
1092                          * LDAP_BACK_RESULT_UTIMEOUT at worst */
1093                         tv.tv_sec = 0;
1094                         tv.tv_usec = LDAP_BACK_RESULT_UTIMEOUT/initial_candidates;
1095                         ldap_pvt_thread_yield();
1096                 }
1097         }
1098
1099         if ( rc == -1 ) {
1100                 /*
1101                  * FIXME: need a better strategy to handle errors
1102                  */
1103                 if ( mc ) {
1104                         rc = meta_back_op_result( mc, op, rs, META_TARGET_NONE );
1105                 } else {
1106                         rc = rs->sr_err;
1107                 }
1108                 goto finish;
1109         }
1110
1111         /*
1112          * Rewrite the matched portion of the search base, if required
1113          *
1114          * FIXME: only the last one gets caught!
1115          */
1116         savepriv = op->o_private;
1117         op->o_private = (void *)(long)mi->mi_ntargets;
1118         if ( candidate_match > 0 ) {
1119                 struct berval   pmatched = BER_BVNULL;
1120
1121                 /* we use the first one */
1122                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1123                         if ( candidates[ i ].sr_tag == META_CANDIDATE
1124                                         && candidates[ i ].sr_matched != NULL )
1125                         {
1126                                 struct berval   bv, pbv;
1127                                 int             rc;
1128
1129                                 /* if we got success, and this target
1130                                  * returned noSuchObject, and its suffix
1131                                  * is a superior of the searchBase,
1132                                  * ignore the matchedDN */
1133                                 if ( sres == LDAP_SUCCESS
1134                                         && candidates[ i ].sr_err == LDAP_NO_SUCH_OBJECT
1135                                         && op->o_req_ndn.bv_len > mi->mi_targets[ i ]->mt_nsuffix.bv_len )
1136                                 {
1137                                         free( (char *)candidates[ i ].sr_matched );
1138                                         candidates[ i ].sr_matched = NULL;
1139                                         continue;
1140                                 }
1141
1142                                 ber_str2bv( candidates[ i ].sr_matched, 0, 0, &bv );
1143                                 rc = dnPretty( NULL, &bv, &pbv, op->o_tmpmemctx );
1144
1145                                 if ( rc == LDAP_SUCCESS ) {
1146
1147                                         /* NOTE: if they all are superiors
1148                                          * of the baseDN, the shorter is also
1149                                          * superior of the longer... */
1150                                         if ( pbv.bv_len > pmatched.bv_len ) {
1151                                                 if ( !BER_BVISNULL( &pmatched ) ) {
1152                                                         op->o_tmpfree( pmatched.bv_val, op->o_tmpmemctx );
1153                                                 }
1154                                                 pmatched = pbv;
1155                                                 op->o_private = (void *)i;
1156
1157                                         } else {
1158                                                 op->o_tmpfree( pbv.bv_val, op->o_tmpmemctx );
1159                                         }
1160                                 }
1161
1162                                 if ( candidates[ i ].sr_matched != NULL ) {
1163                                         free( (char *)candidates[ i ].sr_matched );
1164                                         candidates[ i ].sr_matched = NULL;
1165                                 }
1166                         }
1167                 }
1168
1169                 if ( !BER_BVISNULL( &pmatched ) ) {
1170                         matched = pmatched.bv_val;
1171                 }
1172
1173         } else if ( sres == LDAP_NO_SUCH_OBJECT ) {
1174                 matched = op->o_bd->be_suffix[ 0 ].bv_val;
1175         }
1176
1177 #if 0
1178         {
1179                 char    buf[BUFSIZ];
1180                 char    cnd[BUFSIZ];
1181                 int     i;
1182
1183                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1184                         if ( candidates[ i ].sr_tag == META_CANDIDATE ) {
1185                                 cnd[ i ] = '*';
1186                         } else {
1187                                 cnd[ i ] = ' ';
1188                         }
1189                 }
1190                 cnd[ i ] = '\0';
1191
1192                 snprintf( buf, sizeof( buf ), "%s meta_back_search: is_scope=%d is_ok=%d cnd=\"%s\"\n",
1193                         op->o_log_prefix, initial_candidates, is_ok, cnd );
1194
1195                 Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
1196         }
1197 #endif
1198
1199         /*
1200          * In case we returned at least one entry, we return LDAP_SUCCESS
1201          * otherwise, the latter error code we got
1202          *
1203          * FIXME: we should handle error codes and return the more
1204          * important/reasonable
1205          */
1206
1207         if ( sres == LDAP_SUCCESS && rs->sr_v2ref ) {
1208                 sres = LDAP_REFERRAL;
1209         }
1210         rs->sr_err = sres;
1211         rs->sr_matched = matched;
1212         rs->sr_ref = ( sres == LDAP_REFERRAL ? rs->sr_v2ref : NULL );
1213         send_ldap_result( op, rs );
1214         op->o_private = savepriv;
1215         rs->sr_matched = NULL;
1216         rs->sr_ref = NULL;
1217
1218 finish:;
1219         if ( matched && matched != op->o_bd->be_suffix[ 0 ].bv_val ) {
1220                 op->o_tmpfree( matched, op->o_tmpmemctx );
1221         }
1222
1223         if ( rs->sr_v2ref ) {
1224                 ber_bvarray_free( rs->sr_v2ref );
1225         }
1226
1227         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1228                 if ( candidates[ i ].sr_tag != META_CANDIDATE ) {
1229                         continue;
1230                 }
1231
1232                 if ( mc ) {
1233                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1234                         if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] )
1235                                 && candidates[ i ].sr_msgid != META_MSGID_NEED_BIND )
1236                         {
1237                                 LDAP_BACK_CONN_BINDING_CLEAR( &mc->mc_conns[ i ] );
1238                         }
1239                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1240                 }
1241
1242                 if ( candidates[ i ].sr_matched ) {
1243                         free( (char *)candidates[ i ].sr_matched );
1244                         candidates[ i ].sr_matched = NULL;
1245                 }
1246
1247                 if ( candidates[ i ].sr_text ) {
1248                         ldap_memfree( (char *)candidates[ i ].sr_text );
1249                         candidates[ i ].sr_text = NULL;
1250                 }
1251
1252                 if ( candidates[ i ].sr_ref ) {
1253                         ber_bvarray_free( candidates[ i ].sr_ref );
1254                         candidates[ i ].sr_ref = NULL;
1255                 }
1256
1257                 if ( candidates[ i ].sr_ctrls ) {
1258                         ldap_controls_free( candidates[ i ].sr_ctrls );
1259                         candidates[ i ].sr_ctrls = NULL;
1260                 }
1261         }
1262
1263         if ( mc ) {
1264                 meta_back_release_conn( op, mc );
1265         }
1266
1267         return rs->sr_err;
1268 }
1269
1270 static int
1271 meta_send_entry(
1272         Operation       *op,
1273         SlapReply       *rs,
1274         metaconn_t      *mc,
1275         int             target,
1276         LDAPMessage     *e )
1277 {
1278         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
1279         struct berval           a, mapped;
1280         Entry                   ent = { 0 };
1281         BerElement              ber = *e->lm_ber;
1282         Attribute               *attr, **attrp;
1283         struct berval           bdn,
1284                                 dn = BER_BVNULL;
1285         const char              *text;
1286         dncookie                dc;
1287         int                     rc;
1288
1289         if ( ber_scanf( &ber, "{m{", &bdn ) == LBER_ERROR ) {
1290                 return LDAP_DECODING_ERROR;
1291         }
1292
1293         /*
1294          * Rewrite the dn of the result, if needed
1295          */
1296         dc.target = mi->mi_targets[ target ];
1297         dc.conn = op->o_conn;
1298         dc.rs = rs;
1299         dc.ctx = "searchResult";
1300
1301         rs->sr_err = ldap_back_dn_massage( &dc, &bdn, &dn );
1302         if ( rs->sr_err != LDAP_SUCCESS) {
1303                 return rs->sr_err;
1304         }
1305
1306         /*
1307          * Note: this may fail if the target host(s) schema differs
1308          * from the one known to the meta, and a DN with unknown
1309          * attributes is returned.
1310          *
1311          * FIXME: should we log anything, or delegate to dnNormalize?
1312          */
1313         rc = dnPrettyNormal( NULL, &dn, &ent.e_name, &ent.e_nname,
1314                 op->o_tmpmemctx );
1315         if ( dn.bv_val != bdn.bv_val ) {
1316                 free( dn.bv_val );
1317         }
1318         BER_BVZERO( &dn );
1319
1320         if ( rc != LDAP_SUCCESS ) {
1321                 return LDAP_INVALID_DN_SYNTAX;
1322         }
1323
1324         /*
1325          * cache dn
1326          */
1327         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1328                 ( void )meta_dncache_update_entry( &mi->mi_cache,
1329                                 &ent.e_nname, target );
1330         }
1331
1332         attrp = &ent.e_attrs;
1333
1334         dc.ctx = "searchAttrDN";
1335         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
1336                 int                             last = 0;
1337                 slap_syntax_validate_func       *validate;
1338                 slap_syntax_transform_func      *pretty;
1339
1340                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_at,
1341                                 &a, &mapped, BACKLDAP_REMAP );
1342                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0' ) {
1343                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1344                         continue;
1345                 }
1346                 attr = ( Attribute * )ch_calloc( 1, sizeof( Attribute ) );
1347                 if ( attr == NULL ) {
1348                         continue;
1349                 }
1350                 if ( slap_bv2ad( &mapped, &attr->a_desc, &text )
1351                                 != LDAP_SUCCESS) {
1352                         if ( slap_bv2undef_ad( &mapped, &attr->a_desc, &text,
1353                                 SLAP_AD_PROXIED ) != LDAP_SUCCESS )
1354                         {
1355                                 char    buf[ SLAP_TEXT_BUFLEN ];
1356
1357                                 snprintf( buf, sizeof( buf ),
1358                                         "%s meta_send_entry(\"%s\"): "
1359                                         "slap_bv2undef_ad(%s): %s\n",
1360                                         op->o_log_prefix, ent.e_name.bv_val,
1361                                         mapped.bv_val, text );
1362
1363                                 Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
1364                                 ch_free( attr );
1365                                 continue;
1366                         }
1367                 }
1368
1369                 /* no subschemaSubentry */
1370                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
1371                         || attr->a_desc == slap_schema.si_ad_entryDN )
1372                 {
1373
1374                         /*
1375                          * We eat target's subschemaSubentry because
1376                          * a search for this value is likely not
1377                          * to resolve to the appropriate backend;
1378                          * later, the local subschemaSubentry is
1379                          * added.
1380                          *
1381                          * We also eat entryDN because the frontend
1382                          * will reattach it without checking if already
1383                          * present...
1384                          */
1385                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1386
1387                         ch_free(attr);
1388                         continue;
1389                 }
1390
1391                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
1392                                 || attr->a_vals == NULL )
1393                 {
1394                         attr->a_vals = (struct berval *)&slap_dummy_bv;
1395
1396                 } else {
1397                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); ++last )
1398                                 ;
1399                 }
1400
1401                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
1402                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
1403
1404                 if ( !validate && !pretty ) {
1405                         attr_free( attr );
1406                         goto next_attr;
1407                 }
1408
1409                 if ( attr->a_desc == slap_schema.si_ad_objectClass
1410                                 || attr->a_desc == slap_schema.si_ad_structuralObjectClass )
1411                 {
1412                         struct berval   *bv;
1413
1414                         for ( bv = attr->a_vals; !BER_BVISNULL( bv ); bv++ ) {
1415                                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_oc,
1416                                                 bv, &mapped, BACKLDAP_REMAP );
1417                                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0') {
1418                                         free( bv->bv_val );
1419                                         BER_BVZERO( bv );
1420                                         if ( --last < 0 ) {
1421                                                 break;
1422                                         }
1423                                         *bv = attr->a_vals[ last ];
1424                                         BER_BVZERO( &attr->a_vals[ last ] );
1425                                         bv--;
1426
1427                                 } else if ( mapped.bv_val != bv->bv_val ) {
1428                                         free( bv->bv_val );
1429                                         ber_dupbv( bv, &mapped );
1430                                 }
1431                         }
1432                 /*
1433                  * It is necessary to try to rewrite attributes with
1434                  * dn syntax because they might be used in ACLs as
1435                  * members of groups; since ACLs are applied to the
1436                  * rewritten stuff, no dn-based subecj clause could
1437                  * be used at the ldap backend side (see
1438                  * http://www.OpenLDAP.org/faq/data/cache/452.html)
1439                  * The problem can be overcome by moving the dn-based
1440                  * ACLs to the target directory server, and letting
1441                  * everything pass thru the ldap backend.
1442                  */
1443                 } else {
1444                         int     i;
1445
1446                         if ( attr->a_desc->ad_type->sat_syntax ==
1447                                 slap_schema.si_syn_distinguishedName )
1448                         {
1449                                 ldap_dnattr_result_rewrite( &dc, attr->a_vals );
1450
1451                         } else if ( attr->a_desc == slap_schema.si_ad_ref ) {
1452                                 ldap_back_referral_result_rewrite( &dc, attr->a_vals );
1453
1454                         }
1455
1456                         for ( i = 0; i < last; i++ ) {
1457                                 struct berval   pval;
1458                                 int             rc;
1459
1460                                 if ( pretty ) {
1461                                         rc = pretty( attr->a_desc->ad_type->sat_syntax,
1462                                                 &attr->a_vals[i], &pval, NULL );
1463
1464                                 } else {
1465                                         rc = validate( attr->a_desc->ad_type->sat_syntax,
1466                                                 &attr->a_vals[i] );
1467                                 }
1468
1469                                 if ( rc ) {
1470                                         LBER_FREE( attr->a_vals[i].bv_val );
1471                                         if ( --last == i ) {
1472                                                 BER_BVZERO( &attr->a_vals[ i ] );
1473                                                 break;
1474                                         }
1475                                         attr->a_vals[i] = attr->a_vals[last];
1476                                         BER_BVZERO( &attr->a_vals[last] );
1477                                         i--;
1478                                         continue;
1479                                 }
1480
1481                                 if ( pretty ) {
1482                                         LBER_FREE( attr->a_vals[i].bv_val );
1483                                         attr->a_vals[i] = pval;
1484                                 }
1485                         }
1486
1487                         if ( last == 0 && attr->a_vals != &slap_dummy_bv ) {
1488                                 attr_free( attr );
1489                                 goto next_attr;
1490                         }
1491                 }
1492
1493                 if ( last && attr->a_desc->ad_type->sat_equality &&
1494                         attr->a_desc->ad_type->sat_equality->smr_normalize )
1495                 {
1496                         int i;
1497
1498                         attr->a_nvals = ch_malloc( ( last + 1 ) * sizeof( struct berval ) );
1499                         for ( i = 0; i<last; i++ ) {
1500                                 attr->a_desc->ad_type->sat_equality->smr_normalize(
1501                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
1502                                         attr->a_desc->ad_type->sat_syntax,
1503                                         attr->a_desc->ad_type->sat_equality,
1504                                         &attr->a_vals[i], &attr->a_nvals[i],
1505                                         NULL );
1506                         }
1507                         BER_BVZERO( &attr->a_nvals[i] );
1508
1509                 } else {
1510                         attr->a_nvals = attr->a_vals;
1511                 }
1512
1513                 *attrp = attr;
1514                 attrp = &attr->a_next;
1515 next_attr:;
1516         }
1517         rs->sr_entry = &ent;
1518         rs->sr_attrs = op->ors_attrs;
1519         rs->sr_flags = 0;
1520         rs->sr_err = LDAP_SUCCESS;
1521         rc = send_search_entry( op, rs );
1522         switch ( rc ) {
1523         case LDAP_UNAVAILABLE:
1524                 rc = LDAP_OTHER;
1525                 break;
1526         }
1527         rs->sr_entry = NULL;
1528         rs->sr_attrs = NULL;
1529
1530         if ( !BER_BVISNULL( &ent.e_name ) ) {
1531                 free( ent.e_name.bv_val );
1532                 BER_BVZERO( &ent.e_name );
1533         }
1534         if ( !BER_BVISNULL( &ent.e_nname ) ) {
1535                 free( ent.e_nname.bv_val );
1536                 BER_BVZERO( &ent.e_nname );
1537         }
1538         entry_clean( &ent );
1539
1540         return rc;
1541 }
1542