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

   1 /* search.c - search operation */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2000-2013 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 #include "portable.h"
  18
  19 #include <stdio.h>
  20 #include <ac/string.h>
  21
  22 #include "back-mdb.h"
  23 #include "idl.h"
  24
  25 static int base_candidate(
  26         BackendDB       *be,
  27         Entry   *e,
  28         ID              *ids );
  29
  30 static int search_candidates(
  31         Operation *op,
  32         SlapReply *rs,
  33         Entry *e,
  34         MDB_txn *txn,
  35         MDB_cursor *mci,
  36         ID      *ids,
  37         ID2L    scopes );
  38
  39 static int parse_paged_cookie( Operation *op, SlapReply *rs );
  40
  41 static void send_paged_response(
  42         Operation *op,
  43         SlapReply *rs,
  44         ID  *lastid,
  45         int tentries );
  46
  47 /* Dereference aliases for a single alias entry. Return the final
  48  * dereferenced entry on success, NULL on any failure.
  49  */
  50 static Entry * deref_base (
  51         Operation *op,
  52         SlapReply *rs,
  53         Entry *e,
  54         Entry **matched,
  55         MDB_txn *txn,
  56         ID      *tmp,
  57         ID      *visited )
  58 {
  59         struct berval ndn;
  60
  61         rs->sr_err = LDAP_ALIAS_DEREF_PROBLEM;
  62         rs->sr_text = "maximum deref depth exceeded";
  63
  64         for (;;) {
  65                 /* Remember the last entry we looked at, so we can
  66                  * report broken links
  67                  */
  68                 *matched = e;
  69
  70                 if (MDB_IDL_N(tmp) >= op->o_bd->be_max_deref_depth) {
  71                         e = NULL;
  72                         break;
  73                 }
  74
  75                 /* If this is part of a subtree or onelevel search,
  76                  * have we seen this ID before? If so, quit.
  77                  */
  78                 if ( visited && mdb_idl_insert( visited, e->e_id ) ) {
  79                         e = NULL;
  80                         break;
  81                 }
  82
  83                 /* If we've seen this ID during this deref iteration,
  84                  * we've hit a loop.
  85                  */
  86                 if ( mdb_idl_insert( tmp, e->e_id ) ) {
  87                         rs->sr_err = LDAP_ALIAS_PROBLEM;
  88                         rs->sr_text = "circular alias";
  89                         e = NULL;
  90                         break;
  91                 }
  92
  93                 /* If there was a problem getting the aliasedObjectName,
  94                  * get_alias_dn will have set the error status.
  95                  */
  96                 if ( get_alias_dn(e, &ndn, &rs->sr_err, &rs->sr_text) ) {
  97                         e = NULL;
  98                         break;
  99                 }
 100
 101                 rs->sr_err = mdb_dn2entry( op, txn, NULL, &ndn, &e, NULL, 0 );
 102                 if (rs->sr_err) {
 103                         rs->sr_err = LDAP_ALIAS_PROBLEM;
 104                         rs->sr_text = "aliasedObject not found";
 105                         break;
 106                 }
 107
 108                 /* Free the previous entry, continue to work with the
 109                  * one we just retrieved.
 110                  */
 111                 mdb_entry_return( op, *matched );
 112
 113                 /* We found a regular entry. Return this to the caller.
 114                  */
 115                 if (!is_entry_alias(e)) {
 116                         rs->sr_err = LDAP_SUCCESS;
 117                         rs->sr_text = NULL;
 118                         break;
 119                 }
 120         }
 121         return e;
 122 }
 123
 124 /* Look for and dereference all aliases within the search scope.
 125  * Requires "stack" to be able to hold 6 levels of DB_SIZE IDLs.
 126  * Of course we're hardcoded to require a minimum of 8 UM_SIZE
 127  * IDLs so this is never a problem.
 128  */
 129 static int search_aliases(
 130         Operation *op,
 131         SlapReply *rs,
 132         ID e_id,
 133         MDB_txn *txn,
 134         MDB_cursor *mci,
 135         ID2L scopes,
 136         ID *stack )
 137 {
 138         ID *aliases, *curscop, *visited, *newsubs, *oldsubs, *tmp;
 139         ID cursora, ida, cursoro, ido;
 140         Entry *matched, *a;
 141         struct berval bv_alias = BER_BVC( "alias" );
 142         AttributeAssertion aa_alias = ATTRIBUTEASSERTION_INIT;
 143         Filter  af;
 144         int first = 1;
 145
 146         aliases = stack;        /* IDL of all aliases in the database */
 147         curscop = aliases + MDB_IDL_DB_SIZE;    /* Aliases in the current scope */
 148         visited = curscop + MDB_IDL_DB_SIZE;    /* IDs we've seen in this search */
 149         newsubs = visited + MDB_IDL_DB_SIZE;    /* New subtrees we've added */
 150         oldsubs = newsubs + MDB_IDL_DB_SIZE;    /* Subtrees added previously */
 151         tmp = oldsubs + MDB_IDL_DB_SIZE;        /* Scratch space for deref_base() */
 152
 153         af.f_choice = LDAP_FILTER_EQUALITY;
 154         af.f_ava = &aa_alias;
 155         af.f_av_desc = slap_schema.si_ad_objectClass;
 156         af.f_av_value = bv_alias;
 157         af.f_next = NULL;
 158
 159         /* Find all aliases in database */
 160         MDB_IDL_ZERO( aliases );
 161         rs->sr_err = mdb_filter_candidates( op, txn, &af, aliases,
 162                 curscop, visited );
 163         if (rs->sr_err != LDAP_SUCCESS || MDB_IDL_IS_ZERO( aliases )) {
 164                 return rs->sr_err;
 165         }
 166         oldsubs[0] = 1;
 167         oldsubs[1] = e_id;
 168
 169         MDB_IDL_ZERO( visited );
 170         MDB_IDL_ZERO( newsubs );
 171
 172         cursoro = 0;
 173         ido = mdb_idl_first( oldsubs, &cursoro );
 174
 175         for (;;) {
 176                 /* Set curscop to only the aliases in the current scope. Start with
 177                  * all the aliases, then get the intersection with the scope.
 178                  */
 179                 rs->sr_err = mdb_idscope( op, txn, e_id, aliases, curscop );
 180
 181                 /* Dereference all of the aliases in the current scope. */
 182                 cursora = 0;
 183                 for (ida = mdb_idl_first(curscop, &cursora); ida != NOID;
 184                         ida = mdb_idl_next(curscop, &cursora))
 185                 {
 186                         rs->sr_err = mdb_id2entry(op, mci, ida, &a);
 187                         if (rs->sr_err != LDAP_SUCCESS) {
 188                                 continue;
 189                         }
 190
 191                         /* This should only happen if the curscop IDL has maxed out and
 192                          * turned into a range that spans IDs indiscriminately
 193                          */
 194                         if (!is_entry_alias(a)) {
 195                                 mdb_entry_return(op, a);
 196                                 continue;
 197                         }
 198
 199                         /* Actually dereference the alias */
 200                         MDB_IDL_ZERO(tmp);
 201                         a = deref_base( op, rs, a, &matched, txn,
 202                                 tmp, visited );
 203                         if (a) {
 204                                 /* If the target was not already in our current scopes,
 205                                  * make note of it in the newsubs list.
 206                                  */
 207                                 ID2 mid;
 208                                 mid.mid = a->e_id;
 209                                 mid.mval.mv_data = NULL;
 210                                 if (mdb_id2l_insert(scopes, &mid) == 0) {
 211                                         mdb_idl_insert(newsubs, a->e_id);
 212                                 }
 213                                 mdb_entry_return( op, a );
 214
 215                         } else if (matched) {
 216                                 /* Alias could not be dereferenced, or it deref'd to
 217                                  * an ID we've already seen. Ignore it.
 218                                  */
 219                                 mdb_entry_return( op, matched );
 220                                 rs->sr_text = NULL;
 221                                 rs->sr_err = 0;
 222                         }
 223                 }
 224                 /* If this is a OneLevel search, we're done; oldsubs only had one
 225                  * ID in it. For a Subtree search, oldsubs may be a list of scope IDs.
 226                  */
 227                 if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) break;
 228 nextido:
 229                 ido = mdb_idl_next( oldsubs, &cursoro );
 230
 231                 /* If we're done processing the old scopes, did we add any new
 232                  * scopes in this iteration? If so, go back and do those now.
 233                  */
 234                 if (ido == NOID) {
 235                         if (MDB_IDL_IS_ZERO(newsubs)) break;
 236                         MDB_IDL_CPY(oldsubs, newsubs);
 237                         MDB_IDL_ZERO(newsubs);
 238                         cursoro = 0;
 239                         ido = mdb_idl_first( oldsubs, &cursoro );
 240                 }
 241
 242                 /* Find the entry corresponding to the next scope. If it can't
 243                  * be found, ignore it and move on. This should never happen;
 244                  * we should never see the ID of an entry that doesn't exist.
 245                  */
 246                 {
 247                         MDB_val edata;
 248                         rs->sr_err = mdb_id2edata(op, mci, ido, &edata);
 249                         if ( rs->sr_err != MDB_SUCCESS ) {
 250                                 goto nextido;
 251                         }
 252                         e_id = ido;
 253                 }
 254         }
 255         return rs->sr_err;
 256 }
 257
 258 /* Get the next ID from the DB. Used if the candidate list is
 259  * a range and simple iteration hits missing entryIDs
 260  */
 261 static int
 262 mdb_get_nextid(MDB_cursor *mci, ID *cursor)
 263 {
 264         MDB_val key;
 265         ID id;
 266         int rc;
 267
 268         id = *cursor + 1;
 269         key.mv_data = &id;
 270         key.mv_size = sizeof(ID);
 271         rc = mdb_cursor_get( mci, &key, NULL, MDB_SET_RANGE );
 272         if ( rc )
 273                 return rc;
 274         memcpy( cursor, key.mv_data, sizeof(ID));
 275         return 0;
 276 }
 277
 278 static void scope_chunk_free( void *key, void *data )
 279 {
 280         ID2 *p1, *p2;
 281         for (p1 = data; p1; p1 = p2) {
 282                 p2 = p1[0].mval.mv_data;
 283                 ber_memfree_x(p1, NULL);
 284         }
 285 }
 286
 287 static ID2 *scope_chunk_get( Operation *op )
 288 {
 289         struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
 290         ID2 *ret = NULL;
 291
 292         ldap_pvt_thread_pool_getkey( op->o_threadctx, (void *)scope_chunk_get,
 293                         (void *)&ret, NULL );
 294         if ( !ret ) {
 295                 ret = ch_malloc( MDB_IDL_UM_SIZE * sizeof( ID2 ));
 296         } else {
 297                 void *r2 = ret[0].mval.mv_data;
 298                 ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)scope_chunk_get,
 299                         r2, scope_chunk_free, NULL, NULL );
 300         }
 301         return ret;
 302 }
 303
 304 static void scope_chunk_ret( Operation *op, ID2 *scopes )
 305 {
 306         struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
 307         void *ret = NULL;
 308
 309         ldap_pvt_thread_pool_getkey( op->o_threadctx, (void *)scope_chunk_get,
 310                         &ret, NULL );
 311         scopes[0].mval.mv_data = ret;
 312         ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)scope_chunk_get,
 313                         (void *)scopes, scope_chunk_free, NULL, NULL );
 314 }
 315
 316 int
 317 mdb_search( Operation *op, SlapReply *rs )
 318 {
 319         struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
 320         ID              id, cursor, nsubs, ncand, cscope;
 321         ID              lastid = NOID;
 322         ID              candidates[MDB_IDL_UM_SIZE];
 323         ID              iscopes[MDB_IDL_DB_SIZE];
 324         ID2             *scopes;
 325         Entry           *e = NULL, *base = NULL;
 326         Entry           *matched = NULL;
 327         AttributeName   *attrs;
 328         slap_mask_t     mask;
 329         time_t          stoptime;
 330         int             manageDSAit;
 331         int             tentries = 0;
 332         IdScopes        isc;
 333         MDB_cursor      *mci, *mcd;
 334
 335         mdb_op_info     opinfo = {{{0}}}, *moi = &opinfo;
 336         MDB_txn                 *ltid = NULL;
 337
 338         Debug( LDAP_DEBUG_TRACE, "=> " LDAP_XSTRING(mdb_search) "\n", 0, 0, 0);
 339         attrs = op->oq_search.rs_attrs;
 340
 341         manageDSAit = get_manageDSAit( op );
 342
 343         rs->sr_err = mdb_opinfo_get( op, mdb, 1, &moi );
 344         switch(rs->sr_err) {
 345         case 0:
 346                 break;
 347         default:
 348                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 349                 return rs->sr_err;
 350         }
 351
 352         ltid = moi->moi_txn;
 353
 354         rs->sr_err = mdb_cursor_open( ltid, mdb->mi_id2entry, &mci );
 355         if ( rs->sr_err ) {
 356                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 357                 return rs->sr_err;
 358         }
 359
 360         rs->sr_err = mdb_cursor_open( ltid, mdb->mi_dn2id, &mcd );
 361         if ( rs->sr_err ) {
 362                 mdb_cursor_close( mci );
 363                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 364                 return rs->sr_err;
 365         }
 366
 367         scopes = scope_chunk_get( op );
 368         isc.mt = ltid;
 369         isc.mc = mcd;
 370         isc.scopes = scopes;
 371         isc.oscope = op->ors_scope;
 372
 373         if ( op->ors_deref & LDAP_DEREF_FINDING ) {
 374                 MDB_IDL_ZERO(candidates);
 375         }
 376 dn2entry_retry:
 377         /* get entry with reader lock */
 378         rs->sr_err = mdb_dn2entry( op, ltid, mcd, &op->o_req_ndn, &e, &nsubs, 1 );
 379
 380         switch(rs->sr_err) {
 381         case MDB_NOTFOUND:
 382                 matched = e;
 383                 e = NULL;
 384                 break;
 385         case 0:
 386                 break;
 387         case LDAP_BUSY:
 388                 send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
 389                 goto done;
 390         default:
 391                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 392                 goto done;
 393         }
 394
 395         if ( op->ors_deref & LDAP_DEREF_FINDING ) {
 396                 if ( matched && is_entry_alias( matched )) {
 397                         struct berval stub;
 398
 399                         stub.bv_val = op->o_req_ndn.bv_val;
 400                         stub.bv_len = op->o_req_ndn.bv_len - matched->e_nname.bv_len - 1;
 401                         e = deref_base( op, rs, matched, &matched, ltid,
 402                                 candidates, NULL );
 403                         if ( e ) {
 404                                 build_new_dn( &op->o_req_ndn, &e->e_nname, &stub,
 405                                         op->o_tmpmemctx );
 406                                 mdb_entry_return(op, e);
 407                                 matched = NULL;
 408                                 goto dn2entry_retry;
 409                         }
 410                 } else if ( e && is_entry_alias( e )) {
 411                         e = deref_base( op, rs, e, &matched, ltid,
 412                                 candidates, NULL );
 413                 }
 414         }
 415
 416         if ( e == NULL ) {
 417                 struct berval matched_dn = BER_BVNULL;
 418
 419                 if ( matched != NULL ) {
 420                         BerVarray erefs = NULL;
 421
 422                         /* return referral only if "disclose"
 423                          * is granted on the object */
 424                         if ( ! access_allowed( op, matched,
 425                                                 slap_schema.si_ad_entry,
 426                                                 NULL, ACL_DISCLOSE, NULL ) )
 427                         {
 428                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 429
 430                         } else {
 431                                 ber_dupbv( &matched_dn, &matched->e_name );
 432
 433                                 erefs = is_entry_referral( matched )
 434                                         ? get_entry_referrals( op, matched )
 435                                         : NULL;
 436                                 if ( rs->sr_err == MDB_NOTFOUND )
 437                                         rs->sr_err = LDAP_REFERRAL;
 438                                 rs->sr_matched = matched_dn.bv_val;
 439                         }
 440
 441                         mdb_entry_return(op, matched);
 442                         matched = NULL;
 443
 444                         if ( erefs ) {
 445                                 rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 446                                         &op->o_req_dn, op->oq_search.rs_scope );
 447                                 ber_bvarray_free( erefs );
 448                         }
 449
 450                 } else {
 451                         rs->sr_ref = referral_rewrite( default_referral,
 452                                 NULL, &op->o_req_dn, op->oq_search.rs_scope );
 453                         rs->sr_err = rs->sr_ref != NULL ? LDAP_REFERRAL : LDAP_NO_SUCH_OBJECT;
 454                 }
 455
 456                 send_ldap_result( op, rs );
 457
 458                 if ( rs->sr_ref ) {
 459                         ber_bvarray_free( rs->sr_ref );
 460                         rs->sr_ref = NULL;
 461                 }
 462                 if ( !BER_BVISNULL( &matched_dn ) ) {
 463                         ber_memfree( matched_dn.bv_val );
 464                         rs->sr_matched = NULL;
 465                 }
 466                 goto done;
 467         }
 468
 469         /* NOTE: __NEW__ "search" access is required
 470          * on searchBase object */
 471         if ( ! access_allowed_mask( op, e, slap_schema.si_ad_entry,
 472                                 NULL, ACL_SEARCH, NULL, &mask ) )
 473         {
 474                 if ( !ACL_GRANT( mask, ACL_DISCLOSE ) ) {
 475                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
 476                 } else {
 477                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
 478                 }
 479
 480                 mdb_entry_return( op,e);
 481                 send_ldap_result( op, rs );
 482                 goto done;
 483         }
 484
 485         if ( !manageDSAit && is_entry_referral( e ) ) {
 486                 /* entry is a referral */
 487                 struct berval matched_dn = BER_BVNULL;
 488                 BerVarray erefs = NULL;
 489
 490                 ber_dupbv( &matched_dn, &e->e_name );
 491                 erefs = get_entry_referrals( op, e );
 492
 493                 rs->sr_err = LDAP_REFERRAL;
 494
 495                 mdb_entry_return( op, e );
 496                 e = NULL;
 497
 498                 if ( erefs ) {
 499                         rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 500                                 &op->o_req_dn, op->oq_search.rs_scope );
 501                         ber_bvarray_free( erefs );
 502
 503                         if ( !rs->sr_ref ) {
 504                                 rs->sr_text = "bad_referral object";
 505                         }
 506                 }
 507
 508                 Debug( LDAP_DEBUG_TRACE,
 509                         LDAP_XSTRING(mdb_search) ": entry is referral\n",
 510                         0, 0, 0 );
 511
 512                 rs->sr_matched = matched_dn.bv_val;
 513                 send_ldap_result( op, rs );
 514
 515                 ber_bvarray_free( rs->sr_ref );
 516                 rs->sr_ref = NULL;
 517                 ber_memfree( matched_dn.bv_val );
 518                 rs->sr_matched = NULL;
 519                 goto done;
 520         }
 521
 522         if ( get_assert( op ) &&
 523                 ( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
 524         {
 525                 rs->sr_err = LDAP_ASSERTION_FAILED;
 526                 mdb_entry_return( op,e);
 527                 send_ldap_result( op, rs );
 528                 goto done;
 529         }
 530
 531         /* compute it anyway; root does not use it */
 532         stoptime = op->o_time + op->ors_tlimit;
 533
 534         base = e;
 535
 536         e = NULL;
 537
 538         /* select candidates */
 539         if ( op->oq_search.rs_scope == LDAP_SCOPE_BASE ) {
 540                 rs->sr_err = base_candidate( op->o_bd, base, candidates );
 541                 scopes[0].mid = 0;
 542                 ncand = 1;
 543         } else {
 544                 if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) {
 545                         size_t nkids;
 546                         MDB_val key, data;
 547                         key.mv_data = &base->e_id;
 548                         key.mv_size = sizeof( ID );
 549                         mdb_cursor_get( mcd, &key, &data, MDB_SET );
 550                         mdb_cursor_count( mcd, &nkids );
 551                         nsubs = nkids - 1;
 552                 } else if ( !base->e_id ) {
 553                         /* we don't maintain nsubs for entryID 0.
 554                          * just grab entry count from id2entry stat
 555                          */
 556                         MDB_stat ms;
 557                         mdb_stat( ltid, mdb->mi_id2entry, &ms );
 558                         nsubs = ms.ms_entries;
 559                 }
 560                 MDB_IDL_ZERO( candidates );
 561                 scopes[0].mid = 1;
 562                 scopes[1].mid = base->e_id;
 563                 scopes[1].mval.mv_data = NULL;
 564                 rs->sr_err = search_candidates( op, rs, base,
 565                         ltid, mci, candidates, scopes );
 566                 ncand = MDB_IDL_N( candidates );
 567                 if ( !base->e_id || ncand == NOID ) {
 568                         /* grab entry count from id2entry stat
 569                          */
 570                         MDB_stat ms;
 571                         mdb_stat( ltid, mdb->mi_id2entry, &ms );
 572                         if ( !base->e_id )
 573                                 nsubs = ms.ms_entries;
 574                         if ( ncand == NOID )
 575                                 ncand = ms.ms_entries;
 576                 }
 577         }
 578
 579         /* start cursor at beginning of candidates.
 580          */
 581         cursor = 0;
 582
 583         if ( candidates[0] == 0 ) {
 584                 Debug( LDAP_DEBUG_TRACE,
 585                         LDAP_XSTRING(mdb_search) ": no candidates\n",
 586                         0, 0, 0 );
 587
 588                 goto nochange;
 589         }
 590
 591         /* if not root and candidates exceed to-be-checked entries, abort */
 592         if ( op->ors_limit      /* isroot == FALSE */ &&
 593                 op->ors_limit->lms_s_unchecked != -1 &&
 594                 ncand > (unsigned) op->ors_limit->lms_s_unchecked )
 595         {
 596                 rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
 597                 send_ldap_result( op, rs );
 598                 rs->sr_err = LDAP_SUCCESS;
 599                 goto done;
 600         }
 601
 602         if ( op->ors_limit == NULL      /* isroot == TRUE */ ||
 603                 !op->ors_limit->lms_s_pr_hide )
 604         {
 605                 tentries = ncand;
 606         }
 607
 608         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 609                 PagedResultsState *ps = op->o_pagedresults_state;
 610                 /* deferred cookie parsing */
 611                 rs->sr_err = parse_paged_cookie( op, rs );
 612                 if ( rs->sr_err != LDAP_SUCCESS ) {
 613                         send_ldap_result( op, rs );
 614                         goto done;
 615                 }
 616
 617                 cursor = (ID) ps->ps_cookie;
 618                 if ( cursor && ps->ps_size == 0 ) {
 619                         rs->sr_err = LDAP_SUCCESS;
 620                         rs->sr_text = "search abandoned by pagedResult size=0";
 621                         send_ldap_result( op, rs );
 622                         goto done;
 623                 }
 624                 id = mdb_idl_first( candidates, &cursor );
 625                 if ( id == NOID ) {
 626                         Debug( LDAP_DEBUG_TRACE,
 627                                 LDAP_XSTRING(mdb_search)
 628                                 ": no paged results candidates\n",
 629                                 0, 0, 0 );
 630                         send_paged_response( op, rs, &lastid, 0 );
 631
 632                         rs->sr_err = LDAP_OTHER;
 633                         goto done;
 634                 }
 635                 if ( id == (ID)ps->ps_cookie )
 636                         id = mdb_idl_next( candidates, &cursor );
 637                 nsubs = ncand;  /* always bypass scope'd search */
 638                 goto loop_begin;
 639         }
 640         if ( nsubs < ncand ) {
 641                 int rc;
 642                 /* Do scope-based search */
 643
 644                 /* if any alias scopes were set, save them */
 645                 if (scopes[0].mid > 1) {
 646                         cursor = 1;
 647                         for (cscope = 1; cscope <= scopes[0].mid; cscope++) {
 648                                 /* Ignore the original base */
 649                                 if (scopes[cscope].mid == base->e_id)
 650                                         continue;
 651                                 iscopes[cursor++] = scopes[cscope].mid;
 652                         }
 653                         iscopes[0] = scopes[0].mid - 1;
 654                 } else {
 655                         iscopes[0] = 0;
 656                 }
 657
 658                 isc.id = base->e_id;
 659                 isc.numrdns = 0;
 660                 rc = mdb_dn2id_walk( op, &isc );
 661                 if ( rc )
 662                         id = NOID;
 663                 else
 664                         id = isc.id;
 665                 cscope = 0;
 666         } else {
 667                 id = mdb_idl_first( candidates, &cursor );
 668         }
 669
 670         while (id != NOID)
 671         {
 672                 int scopeok;
 673                 MDB_val edata;
 674
 675 loop_begin:
 676
 677                 /* check for abandon */
 678                 if ( op->o_abandon ) {
 679                         rs->sr_err = SLAPD_ABANDON;
 680                         send_ldap_result( op, rs );
 681                         goto done;
 682                 }
 683
 684                 /* mostly needed by internal searches,
 685                  * e.g. related to syncrepl, for whom
 686                  * abandon does not get set... */
 687                 if ( slapd_shutdown ) {
 688                         rs->sr_err = LDAP_UNAVAILABLE;
 689                         send_ldap_disconnect( op, rs );
 690                         goto done;
 691                 }
 692
 693                 /* check time limit */
 694                 if ( op->ors_tlimit != SLAP_NO_LIMIT
 695                                 && slap_get_time() > stoptime )
 696                 {
 697                         rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 698                         rs->sr_ref = rs->sr_v2ref;
 699                         send_ldap_result( op, rs );
 700                         rs->sr_err = LDAP_SUCCESS;
 701                         goto done;
 702                 }
 703
 704
 705                 if ( nsubs < ncand ) {
 706                         unsigned i;
 707                         /* Is this entry in the candidate list? */
 708                         scopeok = 0;
 709                         if (MDB_IDL_IS_RANGE( candidates )) {
 710                                 if ( id >= MDB_IDL_RANGE_FIRST( candidates ) &&
 711                                         id <= MDB_IDL_RANGE_LAST( candidates ))
 712                                         scopeok = 1;
 713                         } else {
 714                                 i = mdb_idl_search( candidates, id );
 715                                 if ( candidates[i] == id )
 716                                         scopeok = 1;
 717                         }
 718                         if ( scopeok )
 719                                 goto scopeok;
 720                         goto loop_continue;
 721                 }
 722
 723                 /* Does this candidate actually satisfy the search scope?
 724                  */
 725                 scopeok = 0;
 726                 isc.numrdns = 0;
 727                 switch( op->ors_scope ) {
 728                 case LDAP_SCOPE_BASE:
 729                         /* This is always true, yes? */
 730                         if ( id == base->e_id ) scopeok = 1;
 731                         break;
 732
 733 #ifdef LDAP_SCOPE_CHILDREN
 734                 case LDAP_SCOPE_CHILDREN:
 735                         if ( id == base->e_id ) break;
 736                         /* Fall-thru */
 737 #endif
 738                 case LDAP_SCOPE_SUBTREE:
 739                         if ( id == base->e_id ) {
 740                                 scopeok = 1;
 741                                 break;
 742                         }
 743                         /* Fall-thru */
 744                 case LDAP_SCOPE_ONELEVEL:
 745                         isc.id = id;
 746                         isc.nscope = 0;
 747                         rs->sr_err = mdb_idscopes( op, &isc );
 748                         if ( rs->sr_err == MDB_SUCCESS ) {
 749                                 if ( isc.nscope )
 750                                         scopeok = 1;
 751                         } else {
 752                                 if ( rs->sr_err == MDB_NOTFOUND )
 753                                         goto notfound;
 754                         }
 755                         break;
 756                 }
 757
 758                 /* Not in scope, ignore it */
 759                 if ( !scopeok )
 760                 {
 761                         Debug( LDAP_DEBUG_TRACE,
 762                                 LDAP_XSTRING(mdb_search)
 763                                 ": %ld scope not okay\n",
 764                                 (long) id, 0, 0 );
 765                         goto loop_continue;
 766                 }
 767
 768 scopeok:
 769                 if ( id == base->e_id ) {
 770                         e = base;
 771                 } else {
 772
 773                         /* get the entry */
 774                         rs->sr_err = mdb_id2edata( op, mci, id, &edata );
 775                         if ( rs->sr_err == MDB_NOTFOUND ) {
 776 notfound:
 777                                 if( nsubs < ncand )
 778                                         goto loop_continue;
 779
 780                                 if( !MDB_IDL_IS_RANGE(candidates) ) {
 781                                         /* only complain for non-range IDLs */
 782                                         Debug( LDAP_DEBUG_TRACE,
 783                                                 LDAP_XSTRING(mdb_search)
 784                                                 ": candidate %ld not found\n",
 785                                                 (long) id, 0, 0 );
 786                                 } else {
 787                                         /* get the next ID from the DB */
 788                                         rs->sr_err = mdb_get_nextid( mci, &cursor );
 789                                         if ( rs->sr_err == MDB_NOTFOUND ) {
 790                                                 break;
 791                                         }
 792                                         if ( rs->sr_err ) {
 793                                                 rs->sr_err = LDAP_OTHER;
 794                                                 rs->sr_text = "internal error in get_nextid";
 795                                                 send_ldap_result( op, rs );
 796                                                 goto done;
 797                                         }
 798                                         cursor--;
 799                                 }
 800
 801                                 goto loop_continue;
 802                         } else if ( rs->sr_err ) {
 803                                 rs->sr_err = LDAP_OTHER;
 804                                 rs->sr_text = "internal error in mdb_id2edata";
 805                                 send_ldap_result( op, rs );
 806                                 goto done;
 807                         }
 808
 809                         rs->sr_err = mdb_entry_decode( op, &edata, &e );
 810                         if ( rs->sr_err ) {
 811                                 rs->sr_err = LDAP_OTHER;
 812                                 rs->sr_text = "internal error in mdb_entry_decode";
 813                                 send_ldap_result( op, rs );
 814                                 goto done;
 815                         }
 816                         e->e_id = id;
 817                         e->e_name.bv_val = NULL;
 818                         e->e_nname.bv_val = NULL;
 819                 }
 820
 821                 if ( is_entry_subentry( e ) ) {
 822                         if( op->oq_search.rs_scope != LDAP_SCOPE_BASE ) {
 823                                 if(!get_subentries_visibility( op )) {
 824                                         /* only subentries are visible */
 825                                         goto loop_continue;
 826                                 }
 827
 828                         } else if ( get_subentries( op ) &&
 829                                 !get_subentries_visibility( op ))
 830                         {
 831                                 /* only subentries are visible */
 832                                 goto loop_continue;
 833                         }
 834
 835                 } else if ( get_subentries_visibility( op )) {
 836                         /* only subentries are visible */
 837                         goto loop_continue;
 838                 }
 839
 840                 /* aliases were already dereferenced in candidate list */
 841                 if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
 842                         /* but if the search base is an alias, and we didn't
 843                          * deref it when finding, return it.
 844                          */
 845                         if ( is_entry_alias(e) &&
 846                                 ((op->ors_deref & LDAP_DEREF_FINDING) || e != base ))
 847                         {
 848                                 goto loop_continue;
 849                         }
 850                 }
 851
 852                 if ( !manageDSAit && is_entry_glue( e )) {
 853                         goto loop_continue;
 854                 }
 855
 856                 if (e != base) {
 857                         struct berval pdn, pndn;
 858                         char *d, *n;
 859                         int i;
 860
 861                         /* child of base, just append RDNs to base->e_name */
 862                         if ( nsubs < ncand || isc.scopes[isc.nscope].mid == base->e_id ) {
 863                                 pdn = base->e_name;
 864                                 pndn = base->e_nname;
 865                         } else {
 866                                 mdb_id2name( op, ltid, &isc.mc, scopes[isc.nscope].mid, &pdn, &pndn );
 867                         }
 868                         e->e_name.bv_len = pdn.bv_len;
 869                         e->e_nname.bv_len = pndn.bv_len;
 870                         for (i=0; i<isc.numrdns; i++) {
 871                                 e->e_name.bv_len += isc.rdns[i].bv_len + 1;
 872                                 e->e_nname.bv_len += isc.nrdns[i].bv_len + 1;
 873                         }
 874                         e->e_name.bv_val = op->o_tmpalloc(e->e_name.bv_len + 1, op->o_tmpmemctx);
 875                         e->e_nname.bv_val = op->o_tmpalloc(e->e_nname.bv_len + 1, op->o_tmpmemctx);
 876                         d = e->e_name.bv_val;
 877                         n = e->e_nname.bv_val;
 878                         if (nsubs < ncand) {
 879                                 /* RDNs are in top-down order */
 880                                 for (i=isc.numrdns-1; i>=0; i--) {
 881                                         memcpy(d, isc.rdns[i].bv_val, isc.rdns[i].bv_len);
 882                                         d += isc.rdns[i].bv_len;
 883                                         *d++ = ',';
 884                                         memcpy(n, isc.nrdns[i].bv_val, isc.nrdns[i].bv_len);
 885                                         n += isc.nrdns[i].bv_len;
 886                                         *n++ = ',';
 887                                 }
 888                         } else {
 889                                 /* RDNs are in bottom-up order */
 890                                 for (i=0; i<isc.numrdns; i++) {
 891                                         memcpy(d, isc.rdns[i].bv_val, isc.rdns[i].bv_len);
 892                                         d += isc.rdns[i].bv_len;
 893                                         *d++ = ',';
 894                                         memcpy(n, isc.nrdns[i].bv_val, isc.nrdns[i].bv_len);
 895                                         n += isc.nrdns[i].bv_len;
 896                                         *n++ = ',';
 897                                 }
 898                         }
 899
 900                         if (pdn.bv_len) {
 901                                 memcpy(d, pdn.bv_val, pdn.bv_len+1);
 902                                 memcpy(n, pndn.bv_val, pndn.bv_len+1);
 903                         } else {
 904                                 *--d = '\0';
 905                                 *--n = '\0';
 906                                 e->e_name.bv_len--;
 907                                 e->e_nname.bv_len--;
 908                         }
 909                         if (pndn.bv_val != base->e_nname.bv_val) {
 910                                 op->o_tmpfree(pndn.bv_val, op->o_tmpmemctx);
 911                                 op->o_tmpfree(pdn.bv_val, op->o_tmpmemctx);
 912                         }
 913                 }
 914
 915                 /*
 916                  * if it's a referral, add it to the list of referrals. only do
 917                  * this for non-base searches, and don't check the filter
 918                  * explicitly here since it's only a candidate anyway.
 919                  */
 920                 if ( !manageDSAit && op->oq_search.rs_scope != LDAP_SCOPE_BASE
 921                         && is_entry_referral( e ) )
 922                 {
 923                         BerVarray erefs = get_entry_referrals( op, e );
 924                         rs->sr_ref = referral_rewrite( erefs, &e->e_name, NULL,
 925                                 op->oq_search.rs_scope == LDAP_SCOPE_ONELEVEL
 926                                         ? LDAP_SCOPE_BASE : LDAP_SCOPE_SUBTREE );
 927
 928                         rs->sr_entry = e;
 929                         rs->sr_flags = 0;
 930
 931                         send_search_reference( op, rs );
 932
 933                         mdb_entry_return( op, e );
 934                         rs->sr_entry = NULL;
 935                         e = NULL;
 936
 937                         ber_bvarray_free( rs->sr_ref );
 938                         ber_bvarray_free( erefs );
 939                         rs->sr_ref = NULL;
 940
 941                         goto loop_continue;
 942                 }
 943
 944                 /* if it matches the filter and scope, send it */
 945                 rs->sr_err = test_filter( op, e, op->oq_search.rs_filter );
 946
 947                 if ( rs->sr_err == LDAP_COMPARE_TRUE ) {
 948                         /* check size limit */
 949                         if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
 950                                 if ( rs->sr_nentries >= ((PagedResultsState *)op->o_pagedresults_state)->ps_size ) {
 951                                         mdb_entry_return( op, e );
 952                                         e = NULL;
 953                                         send_paged_response( op, rs, &lastid, tentries );
 954                                         goto done;
 955                                 }
 956                                 lastid = id;
 957                         }
 958
 959                         if (e) {
 960                                 /* safe default */
 961                                 rs->sr_attrs = op->oq_search.rs_attrs;
 962                                 rs->sr_operational_attrs = NULL;
 963                                 rs->sr_ctrls = NULL;
 964                                 rs->sr_entry = e;
 965                                 RS_ASSERT( e->e_private != NULL );
 966                                 rs->sr_flags = 0;
 967                                 rs->sr_err = LDAP_SUCCESS;
 968                                 rs->sr_err = send_search_entry( op, rs );
 969                                 rs->sr_attrs = NULL;
 970                                 rs->sr_entry = NULL;
 971                                 if (e != base)
 972                                         mdb_entry_return( op, e );
 973                                 e = NULL;
 974
 975                                 switch ( rs->sr_err ) {
 976                                 case LDAP_SUCCESS:      /* entry sent ok */
 977                                         break;
 978                                 default:                /* entry not sent */
 979                                         break;
 980                                 case LDAP_UNAVAILABLE:
 981                                 case LDAP_SIZELIMIT_EXCEEDED:
 982                                         if ( rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ) {
 983                                                 rs->sr_ref = rs->sr_v2ref;
 984                                                 send_ldap_result( op, rs );
 985                                                 rs->sr_err = LDAP_SUCCESS;
 986
 987                                         } else {
 988                                                 rs->sr_err = LDAP_OTHER;
 989                                         }
 990                                         goto done;
 991                                 }
 992                         }
 993
 994                 } else {
 995                         Debug( LDAP_DEBUG_TRACE,
 996                                 LDAP_XSTRING(mdb_search)
 997                                 ": %ld does not match filter\n",
 998                                 (long) id, 0, 0 );
 999                 }
1000
1001 loop_continue:
1002                 if( e != NULL ) {
1003                         if ( e != base )
1004                                 mdb_entry_return( op, e );
1005                         RS_ASSERT( rs->sr_entry == NULL );
1006                         e = NULL;
1007                         rs->sr_entry = NULL;
1008                 }
1009
1010                 if ( nsubs < ncand ) {
1011                         int rc = mdb_dn2id_walk( op, &isc );
1012                         if (rc) {
1013                                 id = NOID;
1014                                 /* We got to the end of a subtree. If there are any
1015                                  * alias scopes left, search them too.
1016                                  */
1017                                 while (iscopes[0] && cscope < iscopes[0]) {
1018                                         cscope++;
1019                                         isc.id = iscopes[cscope];
1020                                         if ( base )
1021                                                 mdb_entry_return( op, base );
1022                                         rs->sr_err = mdb_id2entry(op, mci, isc.id, &base);
1023                                         if ( !rs->sr_err ) {
1024                                                 mdb_id2name( op, ltid, &isc.mc, isc.id, &base->e_name, &base->e_nname );
1025                                                 isc.numrdns = 0;
1026                                                 if (isc.oscope == LDAP_SCOPE_ONELEVEL)
1027                                                         isc.oscope = LDAP_SCOPE_BASE;
1028                                                 rc = mdb_dn2id_walk( op, &isc );
1029                                                 if ( !rc ) {
1030                                                         id = isc.id;
1031                                                         break;
1032                                                 }
1033                                         }
1034                                 }
1035                         } else
1036                                 id = isc.id;
1037                 } else {
1038                         id = mdb_idl_next( candidates, &cursor );
1039                 }
1040         }
1041
1042 nochange:
1043         rs->sr_ctrls = NULL;
1044         rs->sr_ref = rs->sr_v2ref;
1045         rs->sr_err = (rs->sr_v2ref == NULL) ? LDAP_SUCCESS : LDAP_REFERRAL;
1046         rs->sr_rspoid = NULL;
1047         if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
1048                 send_paged_response( op, rs, NULL, 0 );
1049         } else {
1050                 send_ldap_result( op, rs );
1051         }
1052
1053         rs->sr_err = LDAP_SUCCESS;
1054
1055 done:
1056         mdb_cursor_close( mcd );
1057         mdb_cursor_close( mci );
1058         if ( moi == &opinfo ) {
1059                 mdb_txn_reset( moi->moi_txn );
1060                 LDAP_SLIST_REMOVE( &op->o_extra, &moi->moi_oe, OpExtra, oe_next );
1061         } else {
1062                 moi->moi_ref--;
1063         }
1064         if( rs->sr_v2ref ) {
1065                 ber_bvarray_free( rs->sr_v2ref );
1066                 rs->sr_v2ref = NULL;
1067         }
1068         if (base)
1069                 mdb_entry_return( op,base);
1070         scope_chunk_ret( op, scopes );
1071
1072         return rs->sr_err;
1073 }
1074
1075
1076 static int base_candidate(
1077         BackendDB       *be,
1078         Entry   *e,
1079         ID              *ids )
1080 {
1081         Debug(LDAP_DEBUG_ARGS, "base_candidates: base: \"%s\" (0x%08lx)\n",
1082                 e->e_nname.bv_val, (long) e->e_id, 0);
1083
1084         ids[0] = 1;
1085         ids[1] = e->e_id;
1086         return 0;
1087 }
1088
1089 /* Look for "objectClass Present" in this filter.
1090  * Also count depth of filter tree while we're at it.
1091  */
1092 static int oc_filter(
1093         Filter *f,
1094         int cur,
1095         int *max )
1096 {
1097         int rc = 0;
1098
1099         assert( f != NULL );
1100
1101         if( cur > *max ) *max = cur;
1102
1103         switch( f->f_choice ) {
1104         case LDAP_FILTER_PRESENT:
1105                 if (f->f_desc == slap_schema.si_ad_objectClass) {
1106                         rc = 1;
1107                 }
1108                 break;
1109
1110         case LDAP_FILTER_AND:
1111         case LDAP_FILTER_OR:
1112                 cur++;
1113                 for ( f=f->f_and; f; f=f->f_next ) {
1114                         (void) oc_filter(f, cur, max);
1115                 }
1116                 break;
1117
1118         default:
1119                 break;
1120         }
1121         return rc;
1122 }
1123
1124 static void search_stack_free( void *key, void *data )
1125 {
1126         ber_memfree_x(data, NULL);
1127 }
1128
1129 static void *search_stack( Operation *op )
1130 {
1131         struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
1132         void *ret = NULL;
1133
1134         if ( op->o_threadctx ) {
1135                 ldap_pvt_thread_pool_getkey( op->o_threadctx, (void *)search_stack,
1136                         &ret, NULL );
1137         } else {
1138                 ret = mdb->mi_search_stack;
1139         }
1140
1141         if ( !ret ) {
1142                 ret = ch_malloc( mdb->mi_search_stack_depth * MDB_IDL_UM_SIZE
1143                         * sizeof( ID ) );
1144                 if ( op->o_threadctx ) {
1145                         ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)search_stack,
1146                                 ret, search_stack_free, NULL, NULL );
1147                 } else {
1148                         mdb->mi_search_stack = ret;
1149                 }
1150         }
1151         return ret;
1152 }
1153
1154 static int search_candidates(
1155         Operation *op,
1156         SlapReply *rs,
1157         Entry *e,
1158         MDB_txn *txn,
1159         MDB_cursor *mci,
1160         ID      *ids,
1161         ID2L    scopes )
1162 {
1163         struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
1164         int rc, depth = 1;
1165         Filter          *f, rf, xf, nf, sf;
1166         ID              *stack;
1167         AttributeAssertion aa_ref = ATTRIBUTEASSERTION_INIT;
1168         AttributeAssertion aa_subentry = ATTRIBUTEASSERTION_INIT;
1169
1170         /*
1171          * This routine takes as input a filter (user-filter)
1172          * and rewrites it as follows:
1173          *      (&(scope=DN)[(objectClass=subentry)]
1174          *              (|[(objectClass=referral)](user-filter))
1175          */
1176
1177         Debug(LDAP_DEBUG_TRACE,
1178                 "search_candidates: base=\"%s\" (0x%08lx) scope=%d\n",
1179                 e->e_nname.bv_val, (long) e->e_id, op->oq_search.rs_scope );
1180
1181         f = op->oq_search.rs_filter;
1182
1183         /* If the user's filter uses objectClass=*,
1184          * these clauses are redundant.
1185          */
1186         if (!oc_filter(op->oq_search.rs_filter, 1, &depth)
1187                 && !get_subentries_visibility(op)) {
1188                 if( !get_manageDSAit(op) && !get_domainScope(op) ) {
1189                         /* match referral objects */
1190                         struct berval bv_ref = BER_BVC( "referral" );
1191                         rf.f_choice = LDAP_FILTER_EQUALITY;
1192                         rf.f_ava = &aa_ref;
1193                         rf.f_av_desc = slap_schema.si_ad_objectClass;
1194                         rf.f_av_value = bv_ref;
1195                         rf.f_next = f;
1196                         xf.f_or = &rf;
1197                         xf.f_choice = LDAP_FILTER_OR;
1198                         xf.f_next = NULL;
1199                         f = &xf;
1200                         depth++;
1201                 }
1202         }
1203
1204         if( get_subentries_visibility( op ) ) {
1205                 struct berval bv_subentry = BER_BVC( "subentry" );
1206                 sf.f_choice = LDAP_FILTER_EQUALITY;
1207                 sf.f_ava = &aa_subentry;
1208                 sf.f_av_desc = slap_schema.si_ad_objectClass;
1209                 sf.f_av_value = bv_subentry;
1210                 sf.f_next = f;
1211                 nf.f_choice = LDAP_FILTER_AND;
1212                 nf.f_and = &sf;
1213                 nf.f_next = NULL;
1214                 f = &nf;
1215                 depth++;
1216         }
1217
1218         /* Allocate IDL stack, plus 1 more for former tmp */
1219         if ( depth+1 > mdb->mi_search_stack_depth ) {
1220                 stack = ch_malloc( (depth + 1) * MDB_IDL_UM_SIZE * sizeof( ID ) );
1221         } else {
1222                 stack = search_stack( op );
1223         }
1224
1225         if( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1226                 rc = search_aliases( op, rs, e->e_id, txn, mci, scopes, stack );
1227         } else {
1228                 rc = LDAP_SUCCESS;
1229         }
1230
1231         if ( rc == LDAP_SUCCESS ) {
1232                 rc = mdb_filter_candidates( op, txn, f, ids,
1233                         stack, stack+MDB_IDL_UM_SIZE );
1234         }
1235
1236         if ( depth+1 > mdb->mi_search_stack_depth ) {
1237                 ch_free( stack );
1238         }
1239
1240         if( rc ) {
1241                 Debug(LDAP_DEBUG_TRACE,
1242                         "mdb_search_candidates: failed (rc=%d)\n",
1243                         rc, NULL, NULL );
1244
1245         } else {
1246                 Debug(LDAP_DEBUG_TRACE,
1247                         "mdb_search_candidates: id=%ld first=%ld last=%ld\n",
1248                         (long) ids[0],
1249                         (long) MDB_IDL_FIRST(ids),
1250                         (long) MDB_IDL_LAST(ids) );
1251         }
1252
1253         return rc;
1254 }
1255
1256 static int
1257 parse_paged_cookie( Operation *op, SlapReply *rs )
1258 {
1259         int             rc = LDAP_SUCCESS;
1260         PagedResultsState *ps = op->o_pagedresults_state;
1261
1262         /* this function must be invoked only if the pagedResults
1263          * control has been detected, parsed and partially checked
1264          * by the frontend */
1265         assert( get_pagedresults( op ) > SLAP_CONTROL_IGNORED );
1266
1267         /* cookie decoding/checks deferred to backend... */
1268         if ( ps->ps_cookieval.bv_len ) {
1269                 PagedResultsCookie reqcookie;
1270                 if( ps->ps_cookieval.bv_len != sizeof( reqcookie ) ) {
1271                         /* bad cookie */
1272                         rs->sr_text = "paged results cookie is invalid";
1273                         rc = LDAP_PROTOCOL_ERROR;
1274                         goto done;
1275                 }
1276
1277                 AC_MEMCPY( &reqcookie, ps->ps_cookieval.bv_val, sizeof( reqcookie ));
1278
1279                 if ( reqcookie > ps->ps_cookie ) {
1280                         /* bad cookie */
1281                         rs->sr_text = "paged results cookie is invalid";
1282                         rc = LDAP_PROTOCOL_ERROR;
1283                         goto done;
1284
1285                 } else if ( reqcookie < ps->ps_cookie ) {
1286                         rs->sr_text = "paged results cookie is invalid or old";
1287                         rc = LDAP_UNWILLING_TO_PERFORM;
1288                         goto done;
1289                 }
1290
1291         } else {
1292                 /* we're going to use ps_cookie */
1293                 op->o_conn->c_pagedresults_state.ps_cookie = 0;
1294         }
1295
1296 done:;
1297
1298         return rc;
1299 }
1300
1301 static void
1302 send_paged_response(
1303         Operation       *op,
1304         SlapReply       *rs,
1305         ID              *lastid,
1306         int             tentries )
1307 {
1308         LDAPControl     *ctrls[2];
1309         BerElementBuffer berbuf;
1310         BerElement      *ber = (BerElement *)&berbuf;
1311         PagedResultsCookie respcookie;
1312         struct berval cookie;
1313
1314         Debug(LDAP_DEBUG_ARGS,
1315                 "send_paged_response: lastid=0x%08lx nentries=%d\n",
1316                 lastid ? *lastid : 0, rs->sr_nentries, NULL );
1317
1318         ctrls[1] = NULL;
1319
1320         ber_init2( ber, NULL, LBER_USE_DER );
1321
1322         if ( lastid ) {
1323                 respcookie = ( PagedResultsCookie )(*lastid);
1324                 cookie.bv_len = sizeof( respcookie );
1325                 cookie.bv_val = (char *)&respcookie;
1326
1327         } else {
1328                 respcookie = ( PagedResultsCookie )0;
1329                 BER_BVSTR( &cookie, "" );
1330         }
1331
1332         op->o_conn->c_pagedresults_state.ps_cookie = respcookie;
1333         op->o_conn->c_pagedresults_state.ps_count =
1334                 ((PagedResultsState *)op->o_pagedresults_state)->ps_count +
1335                 rs->sr_nentries;
1336
1337         /* return size of 0 -- no estimate */
1338         ber_printf( ber, "{iO}", 0, &cookie );
1339
1340         ctrls[0] = op->o_tmpalloc( sizeof(LDAPControl), op->o_tmpmemctx );
1341         if ( ber_flatten2( ber, &ctrls[0]->ldctl_value, 0 ) == -1 ) {
1342                 goto done;
1343         }
1344
1345         ctrls[0]->ldctl_oid = LDAP_CONTROL_PAGEDRESULTS;
1346         ctrls[0]->ldctl_iscritical = 0;
1347
1348         slap_add_ctrls( op, rs, ctrls );
1349         rs->sr_err = LDAP_SUCCESS;
1350         send_ldap_result( op, rs );
1351
1352 done:
1353         (void) ber_free_buf( ber );
1354 }