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

   1 /* search.c - search operation */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2000-2008 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-bdb.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         DB_TXN *txn,
  35         ID      *ids,
  36         ID      *scopes );
  37
  38 static int parse_paged_cookie( Operation *op, SlapReply *rs );
  39
  40 static void send_paged_response(
  41         Operation *op,
  42         SlapReply *rs,
  43         ID  *lastid,
  44         int tentries );
  45
  46 /* Dereference aliases for a single alias entry. Return the final
  47  * dereferenced entry on success, NULL on any failure.
  48  */
  49 static Entry * deref_base (
  50         Operation *op,
  51         SlapReply *rs,
  52         Entry *e,
  53         Entry **matched,
  54         DB_TXN *txn,
  55         DB_LOCK *lock,
  56         ID      *tmp,
  57         ID      *visited )
  58 {
  59         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
  60         struct berval ndn;
  61         EntryInfo *ei;
  62         DB_LOCK lockr;
  63
  64         rs->sr_err = LDAP_ALIAS_DEREF_PROBLEM;
  65         rs->sr_text = "maximum deref depth exceeded";
  66
  67         for (;;) {
  68                 /* Remember the last entry we looked at, so we can
  69                  * report broken links
  70                  */
  71                 *matched = e;
  72
  73                 if (BDB_IDL_N(tmp) >= op->o_bd->be_max_deref_depth) {
  74                         e = NULL;
  75                         break;
  76                 }
  77
  78                 /* If this is part of a subtree or onelevel search,
  79                  * have we seen this ID before? If so, quit.
  80                  */
  81                 if ( visited && bdb_idl_insert( visited, e->e_id ) ) {
  82                         e = NULL;
  83                         break;
  84                 }
  85
  86                 /* If we've seen this ID during this deref iteration,
  87                  * we've hit a loop.
  88                  */
  89                 if ( bdb_idl_insert( tmp, e->e_id ) ) {
  90                         rs->sr_err = LDAP_ALIAS_PROBLEM;
  91                         rs->sr_text = "circular alias";
  92                         e = NULL;
  93                         break;
  94                 }
  95
  96                 /* If there was a problem getting the aliasedObjectName,
  97                  * get_alias_dn will have set the error status.
  98                  */
  99                 if ( get_alias_dn(e, &ndn, &rs->sr_err, &rs->sr_text) ) {
 100                         e = NULL;
 101                         break;
 102                 }
 103
 104                 rs->sr_err = bdb_dn2entry( op, txn, &ndn, &ei,
 105                         0, &lockr );
 106                 if ( rs->sr_err == DB_LOCK_DEADLOCK )
 107                         return NULL;
 108
 109                 if ( ei ) {
 110                         e = ei->bei_e;
 111                 } else {
 112                         e = NULL;
 113                 }
 114
 115                 if (!e) {
 116                         rs->sr_err = LDAP_ALIAS_PROBLEM;
 117                         rs->sr_text = "aliasedObject not found";
 118                         break;
 119                 }
 120
 121                 /* Free the previous entry, continue to work with the
 122                  * one we just retrieved.
 123                  */
 124                 bdb_cache_return_entry_r( bdb, *matched, lock);
 125                 *lock = lockr;
 126
 127                 /* We found a regular entry. Return this to the caller. The
 128                  * entry is still locked for Read.
 129                  */
 130                 if (!is_entry_alias(e)) {
 131                         rs->sr_err = LDAP_SUCCESS;
 132                         rs->sr_text = NULL;
 133                         break;
 134                 }
 135         }
 136         return e;
 137 }
 138
 139 /* Look for and dereference all aliases within the search scope. Adds
 140  * the dereferenced entries to the "ids" list. Requires "stack" to be
 141  * able to hold 8 levels of DB_SIZE IDLs. Of course we're hardcoded to
 142  * require a minimum of 8 UM_SIZE IDLs so this is never a problem.
 143  */
 144 static int search_aliases(
 145         Operation *op,
 146         SlapReply *rs,
 147         Entry *e,
 148         DB_TXN *txn,
 149         ID *ids,
 150         ID *scopes,
 151         ID *stack )
 152 {
 153         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 154         ID *aliases, *curscop, *subscop, *visited, *newsubs, *oldsubs, *tmp;
 155         ID cursora, ida, cursoro, ido, *subscop2;
 156         Entry *matched, *a;
 157         EntryInfo *ei;
 158         struct berval bv_alias = BER_BVC( "alias" );
 159         AttributeAssertion aa_alias = ATTRIBUTEASSERTION_INIT;
 160         Filter  af;
 161         DB_LOCK locka, lockr;
 162         int first = 1;
 163
 164         aliases = stack;        /* IDL of all aliases in the database */
 165         curscop = aliases + BDB_IDL_DB_SIZE;    /* Aliases in the current scope */
 166         subscop = curscop + BDB_IDL_DB_SIZE;    /* The current scope */
 167         visited = subscop + BDB_IDL_DB_SIZE;    /* IDs we've seen in this search */
 168         newsubs = visited + BDB_IDL_DB_SIZE;    /* New subtrees we've added */
 169         oldsubs = newsubs + BDB_IDL_DB_SIZE;    /* Subtrees added previously */
 170         tmp = oldsubs + BDB_IDL_DB_SIZE;        /* Scratch space for deref_base() */
 171
 172         /* A copy of subscop, because subscop gets clobbered by
 173          * the bdb_idl_union/intersection routines
 174          */
 175         subscop2 = tmp + BDB_IDL_DB_SIZE;
 176
 177         af.f_choice = LDAP_FILTER_EQUALITY;
 178         af.f_ava = &aa_alias;
 179         af.f_av_desc = slap_schema.si_ad_objectClass;
 180         af.f_av_value = bv_alias;
 181         af.f_next = NULL;
 182
 183         /* Find all aliases in database */
 184         BDB_IDL_ZERO( aliases );
 185         rs->sr_err = bdb_filter_candidates( op, txn, &af, aliases,
 186                 curscop, visited );
 187         if (rs->sr_err != LDAP_SUCCESS) {
 188                 return rs->sr_err;
 189         }
 190         oldsubs[0] = 1;
 191         oldsubs[1] = e->e_id;
 192
 193         BDB_IDL_ZERO( ids );
 194         BDB_IDL_ZERO( visited );
 195         BDB_IDL_ZERO( newsubs );
 196
 197         cursoro = 0;
 198         ido = bdb_idl_first( oldsubs, &cursoro );
 199
 200         for (;;) {
 201                 /* Set curscop to only the aliases in the current scope. Start with
 202                  * all the aliases, obtain the IDL for the current scope, and then
 203                  * get the intersection of these two IDLs. Add the current scope
 204                  * to the cumulative list of candidates.
 205                  */
 206                 BDB_IDL_CPY( curscop, aliases );
 207                 rs->sr_err = bdb_dn2idl( op, txn, &e->e_nname, BEI(e), subscop,
 208                         subscop2+BDB_IDL_DB_SIZE );
 209
 210                 if (first) {
 211                         first = 0;
 212                 } else {
 213                         bdb_cache_return_entry_r (bdb, e, &locka);
 214                 }
 215                 if ( rs->sr_err == DB_LOCK_DEADLOCK )
 216                         return rs->sr_err;
 217
 218                 BDB_IDL_CPY(subscop2, subscop);
 219                 rs->sr_err = bdb_idl_intersection(curscop, subscop);
 220                 bdb_idl_union( ids, subscop2 );
 221
 222                 /* Dereference all of the aliases in the current scope. */
 223                 cursora = 0;
 224                 for (ida = bdb_idl_first(curscop, &cursora); ida != NOID;
 225                         ida = bdb_idl_next(curscop, &cursora))
 226                 {
 227                         ei = NULL;
 228 retry1:
 229                         rs->sr_err = bdb_cache_find_id(op, txn,
 230                                 ida, &ei, 0, &lockr );
 231                         if (rs->sr_err != LDAP_SUCCESS) {
 232                                 if ( rs->sr_err == DB_LOCK_DEADLOCK )
 233                                         return rs->sr_err;
 234                                 if ( rs->sr_err == DB_LOCK_NOTGRANTED )
 235                                         goto retry1;
 236                                 continue;
 237                         }
 238                         a = ei->bei_e;
 239
 240                         /* This should only happen if the curscop IDL has maxed out and
 241                          * turned into a range that spans IDs indiscriminately
 242                          */
 243                         if (!is_entry_alias(a)) {
 244                                 bdb_cache_return_entry_r (bdb, a, &lockr);
 245                                 continue;
 246                         }
 247
 248                         /* Actually dereference the alias */
 249                         BDB_IDL_ZERO(tmp);
 250                         a = deref_base( op, rs, a, &matched, txn, &lockr,
 251                                 tmp, visited );
 252                         if (a) {
 253                                 /* If the target was not already in our current candidates,
 254                                  * make note of it in the newsubs list. Also
 255                                  * set it in the scopes list so that bdb_search
 256                                  * can check it.
 257                                  */
 258                                 if (bdb_idl_insert(ids, a->e_id) == 0) {
 259                                         bdb_idl_insert(newsubs, a->e_id);
 260                                         bdb_idl_insert(scopes, a->e_id);
 261                                 }
 262                                 bdb_cache_return_entry_r( bdb, a, &lockr);
 263
 264                         } else if ( rs->sr_err == DB_LOCK_DEADLOCK ) {
 265                                 return rs->sr_err;
 266                         } else if (matched) {
 267                                 /* Alias could not be dereferenced, or it deref'd to
 268                                  * an ID we've already seen. Ignore it.
 269                                  */
 270                                 bdb_cache_return_entry_r( bdb, matched, &lockr );
 271                                 rs->sr_text = NULL;
 272                         }
 273                 }
 274                 /* If this is a OneLevel search, we're done; oldsubs only had one
 275                  * ID in it. For a Subtree search, oldsubs may be a list of scope IDs.
 276                  */
 277                 if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) break;
 278 nextido:
 279                 ido = bdb_idl_next( oldsubs, &cursoro );
 280
 281                 /* If we're done processing the old scopes, did we add any new
 282                  * scopes in this iteration? If so, go back and do those now.
 283                  */
 284                 if (ido == NOID) {
 285                         if (BDB_IDL_IS_ZERO(newsubs)) break;
 286                         BDB_IDL_CPY(oldsubs, newsubs);
 287                         BDB_IDL_ZERO(newsubs);
 288                         cursoro = 0;
 289                         ido = bdb_idl_first( oldsubs, &cursoro );
 290                 }
 291
 292                 /* Find the entry corresponding to the next scope. If it can't
 293                  * be found, ignore it and move on. This should never happen;
 294                  * we should never see the ID of an entry that doesn't exist.
 295                  * Set the name so that the scope's IDL can be retrieved.
 296                  */
 297                 ei = NULL;
 298 sameido:
 299                 rs->sr_err = bdb_cache_find_id(op, txn, ido, &ei,
 300                         0, &locka );
 301                 if ( rs->sr_err != LDAP_SUCCESS ) {
 302                         if ( rs->sr_err == DB_LOCK_DEADLOCK )
 303                                 return rs->sr_err;
 304                         if ( rs->sr_err == DB_LOCK_NOTGRANTED )
 305                                 goto sameido;
 306                         goto nextido;
 307                 }
 308                 e = ei->bei_e;
 309         }
 310         return rs->sr_err;
 311 }
 312
 313 int
 314 bdb_search( Operation *op, SlapReply *rs )
 315 {
 316         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 317         ID              id, cursor;
 318         ID              lastid = NOID;
 319         ID              candidates[BDB_IDL_UM_SIZE];
 320         ID              scopes[BDB_IDL_DB_SIZE];
 321         Entry           *e = NULL, base, *e_root;
 322         Entry           *matched = NULL;
 323         EntryInfo       *ei;
 324         AttributeName   *attrs;
 325         struct berval   realbase = BER_BVNULL;
 326         slap_mask_t     mask;
 327         time_t          stoptime;
 328         int             manageDSAit;
 329         int             tentries = 0, nentries = 0;
 330         int             idflag = 0;
 331
 332         DB_LOCK         lock;
 333         struct  bdb_op_info     *opinfo = NULL;
 334         DB_TXN                  *ltid = NULL;
 335         OpExtra *oex;
 336
 337         Debug( LDAP_DEBUG_TRACE, "=> " LDAP_XSTRING(bdb_search) "\n", 0, 0, 0);
 338         attrs = op->oq_search.rs_attrs;
 339
 340         LDAP_SLIST_FOREACH( oex, &op->o_extra, oe_next ) {
 341                 if ( oex->oe_key == bdb )
 342                         break;
 343         }
 344         opinfo = (struct bdb_op_info *) oex;
 345
 346         manageDSAit = get_manageDSAit( op );
 347
 348         if ( opinfo && opinfo->boi_txn ) {
 349                 ltid = opinfo->boi_txn;
 350         } else {
 351                 rs->sr_err = bdb_reader_get( op, bdb->bi_dbenv, &ltid );
 352
 353                 switch(rs->sr_err) {
 354                 case 0:
 355                         break;
 356                 default:
 357                         send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 358                         return rs->sr_err;
 359                 }
 360         }
 361
 362         e_root = bdb->bi_cache.c_dntree.bei_e;
 363         if ( op->o_req_ndn.bv_len == 0 ) {
 364                 /* DIT root special case */
 365                 ei = e_root->e_private;
 366                 rs->sr_err = LDAP_SUCCESS;
 367         } else {
 368                 if ( op->ors_deref & LDAP_DEREF_FINDING ) {
 369                         BDB_IDL_ZERO(candidates);
 370                 }
 371 dn2entry_retry:
 372                 /* get entry with reader lock */
 373                 rs->sr_err = bdb_dn2entry( op, ltid, &op->o_req_ndn, &ei,
 374                         1, &lock );
 375         }
 376
 377         switch(rs->sr_err) {
 378         case DB_NOTFOUND:
 379                 matched = ei->bei_e;
 380                 break;
 381         case 0:
 382                 e = ei->bei_e;
 383                 break;
 384         case DB_LOCK_DEADLOCK:
 385                 if ( !opinfo ) {
 386                         ltid->flags &= ~TXN_DEADLOCK;
 387                         goto dn2entry_retry;
 388                 }
 389                 opinfo->boi_err = rs->sr_err;
 390                 /* FALLTHRU */
 391         case LDAP_BUSY:
 392                 send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
 393                 return LDAP_BUSY;
 394         case DB_LOCK_NOTGRANTED:
 395                 goto dn2entry_retry;
 396         default:
 397                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 398                 return rs->sr_err;
 399         }
 400
 401         if ( op->ors_deref & LDAP_DEREF_FINDING ) {
 402                 if ( matched && is_entry_alias( matched )) {
 403                         struct berval stub;
 404
 405                         stub.bv_val = op->o_req_ndn.bv_val;
 406                         stub.bv_len = op->o_req_ndn.bv_len - matched->e_nname.bv_len - 1;
 407                         e = deref_base( op, rs, matched, &matched, ltid, &lock,
 408                                 candidates, NULL );
 409                         if ( e ) {
 410                                 build_new_dn( &op->o_req_ndn, &e->e_nname, &stub,
 411                                         op->o_tmpmemctx );
 412                                 bdb_cache_return_entry_r (bdb, e, &lock);
 413                                 matched = NULL;
 414                                 goto dn2entry_retry;
 415                         }
 416                 } else if ( e && is_entry_alias( e )) {
 417                         e = deref_base( op, rs, e, &matched, ltid, &lock,
 418                                 candidates, NULL );
 419                 }
 420         }
 421
 422         if ( e == NULL ) {
 423                 struct berval matched_dn = BER_BVNULL;
 424
 425                 if ( matched != NULL ) {
 426                         BerVarray erefs = NULL;
 427
 428                         /* return referral only if "disclose"
 429                          * is granted on the object */
 430                         if ( ! access_allowed( op, matched,
 431                                                 slap_schema.si_ad_entry,
 432                                                 NULL, ACL_DISCLOSE, NULL ) )
 433                         {
 434                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 435
 436                         } else {
 437                                 ber_dupbv( &matched_dn, &matched->e_name );
 438
 439                                 erefs = is_entry_referral( matched )
 440                                         ? get_entry_referrals( op, matched )
 441                                         : NULL;
 442                                 if ( rs->sr_err == DB_NOTFOUND )
 443                                         rs->sr_err = LDAP_REFERRAL;
 444                                 rs->sr_matched = matched_dn.bv_val;
 445                         }
 446
 447 #ifdef SLAP_ZONE_ALLOC
 448                         slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
 449 #endif
 450                         bdb_cache_return_entry_r (bdb, matched, &lock);
 451                         matched = NULL;
 452
 453                         if ( erefs ) {
 454                                 rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 455                                         &op->o_req_dn, op->oq_search.rs_scope );
 456                                 ber_bvarray_free( erefs );
 457                         }
 458
 459                 } else {
 460 #ifdef SLAP_ZONE_ALLOC
 461                         slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
 462 #endif
 463                         rs->sr_ref = referral_rewrite( default_referral,
 464                                 NULL, &op->o_req_dn, op->oq_search.rs_scope );
 465                         rs->sr_err = rs->sr_ref != NULL ? LDAP_REFERRAL : LDAP_NO_SUCH_OBJECT;
 466                 }
 467
 468                 send_ldap_result( op, rs );
 469
 470                 if ( rs->sr_ref ) {
 471                         ber_bvarray_free( rs->sr_ref );
 472                         rs->sr_ref = NULL;
 473                 }
 474                 if ( !BER_BVISNULL( &matched_dn ) ) {
 475                         ber_memfree( matched_dn.bv_val );
 476                         rs->sr_matched = NULL;
 477                 }
 478                 return rs->sr_err;
 479         }
 480
 481         /* NOTE: __NEW__ "search" access is required
 482          * on searchBase object */
 483         if ( ! access_allowed_mask( op, e, slap_schema.si_ad_entry,
 484                                 NULL, ACL_SEARCH, NULL, &mask ) )
 485         {
 486                 if ( !ACL_GRANT( mask, ACL_DISCLOSE ) ) {
 487                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
 488                 } else {
 489                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
 490                 }
 491
 492 #ifdef SLAP_ZONE_ALLOC
 493                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 494 #endif
 495                 if ( e != e_root ) {
 496                         bdb_cache_return_entry_r(bdb, e, &lock);
 497                 }
 498                 send_ldap_result( op, rs );
 499                 return rs->sr_err;
 500         }
 501
 502         if ( !manageDSAit && e != e_root && is_entry_referral( e ) ) {
 503                 /* entry is a referral, don't allow add */
 504                 struct berval matched_dn = BER_BVNULL;
 505                 BerVarray erefs = NULL;
 506
 507                 ber_dupbv( &matched_dn, &e->e_name );
 508                 erefs = get_entry_referrals( op, e );
 509
 510                 rs->sr_err = LDAP_REFERRAL;
 511
 512 #ifdef SLAP_ZONE_ALLOC
 513                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 514 #endif
 515                 bdb_cache_return_entry_r( bdb, e, &lock );
 516                 e = NULL;
 517
 518                 if ( erefs ) {
 519                         rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 520                                 &op->o_req_dn, op->oq_search.rs_scope );
 521                         ber_bvarray_free( erefs );
 522
 523                         if ( !rs->sr_ref ) {
 524                                 rs->sr_text = "bad_referral object";
 525                         }
 526                 }
 527
 528                 Debug( LDAP_DEBUG_TRACE,
 529                         LDAP_XSTRING(bdb_search) ": entry is referral\n",
 530                         0, 0, 0 );
 531
 532                 rs->sr_matched = matched_dn.bv_val;
 533                 send_ldap_result( op, rs );
 534
 535                 ber_bvarray_free( rs->sr_ref );
 536                 rs->sr_ref = NULL;
 537                 ber_memfree( matched_dn.bv_val );
 538                 rs->sr_matched = NULL;
 539                 return 1;
 540         }
 541
 542         if ( get_assert( op ) &&
 543                 ( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
 544         {
 545                 rs->sr_err = LDAP_ASSERTION_FAILED;
 546 #ifdef SLAP_ZONE_ALLOC
 547                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 548 #endif
 549                 if ( e != e_root ) {
 550                         bdb_cache_return_entry_r(bdb, e, &lock);
 551                 }
 552                 send_ldap_result( op, rs );
 553                 return 1;
 554         }
 555
 556         /* compute it anyway; root does not use it */
 557         stoptime = op->o_time + op->ors_tlimit;
 558
 559         /* need normalized dn below */
 560         ber_dupbv( &realbase, &e->e_nname );
 561
 562         /* Copy info to base, must free entry before accessing the database
 563          * in search_candidates, to avoid deadlocks.
 564          */
 565         base.e_private = e->e_private;
 566         base.e_nname = realbase;
 567         base.e_id = e->e_id;
 568
 569 #ifdef SLAP_ZONE_ALLOC
 570         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 571 #endif
 572         if ( e != e_root ) {
 573                 bdb_cache_return_entry_r(bdb, e, &lock);
 574         }
 575         e = NULL;
 576
 577         /* select candidates */
 578         if ( op->oq_search.rs_scope == LDAP_SCOPE_BASE ) {
 579                 rs->sr_err = base_candidate( op->o_bd, &base, candidates );
 580
 581         } else {
 582 cand_retry:
 583                 BDB_IDL_ZERO( candidates );
 584                 BDB_IDL_ZERO( scopes );
 585                 rs->sr_err = search_candidates( op, rs, &base,
 586                         ltid, candidates, scopes );
 587                 if ( rs->sr_err == DB_LOCK_DEADLOCK ) {
 588                         if ( !opinfo ) {
 589                                 ltid->flags &= ~TXN_DEADLOCK;
 590                                 goto cand_retry;
 591                         }
 592                         opinfo->boi_err = rs->sr_err;
 593                         send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
 594                         return LDAP_BUSY;
 595                 }
 596         }
 597
 598         /* start cursor at beginning of candidates.
 599          */
 600         cursor = 0;
 601
 602         if ( candidates[0] == 0 ) {
 603                 Debug( LDAP_DEBUG_TRACE,
 604                         LDAP_XSTRING(bdb_search) ": no candidates\n",
 605                         0, 0, 0 );
 606
 607                 goto nochange;
 608         }
 609
 610         /* if not root and candidates exceed to-be-checked entries, abort */
 611         if ( op->ors_limit      /* isroot == FALSE */ &&
 612                 op->ors_limit->lms_s_unchecked != -1 &&
 613                 BDB_IDL_N(candidates) > (unsigned) op->ors_limit->lms_s_unchecked )
 614         {
 615                 rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
 616                 send_ldap_result( op, rs );
 617                 rs->sr_err = LDAP_SUCCESS;
 618                 goto done;
 619         }
 620
 621         if ( op->ors_limit == NULL      /* isroot == TRUE */ ||
 622                 !op->ors_limit->lms_s_pr_hide )
 623         {
 624                 tentries = BDB_IDL_N(candidates);
 625         }
 626
 627         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 628                 PagedResultsState *ps = op->o_pagedresults_state;
 629                 /* deferred cookie parsing */
 630                 rs->sr_err = parse_paged_cookie( op, rs );
 631                 if ( rs->sr_err != LDAP_SUCCESS ) {
 632                         send_ldap_result( op, rs );
 633                         goto done;
 634                 }
 635
 636                 cursor = (ID) ps->ps_cookie;
 637                 if ( cursor && ps->ps_size == 0 ) {
 638                         rs->sr_err = LDAP_SUCCESS;
 639                         rs->sr_text = "search abandoned by pagedResult size=0";
 640                         send_ldap_result( op, rs );
 641                         goto done;
 642                 }
 643                 id = bdb_idl_first( candidates, &cursor );
 644                 if ( id == NOID ) {
 645                         Debug( LDAP_DEBUG_TRACE,
 646                                 LDAP_XSTRING(bdb_search)
 647                                 ": no paged results candidates\n",
 648                                 0, 0, 0 );
 649                         send_paged_response( op, rs, &lastid, 0 );
 650
 651                         rs->sr_err = LDAP_OTHER;
 652                         goto done;
 653                 }
 654                 nentries = ps->ps_count;
 655                 if ( id == (ID)ps->ps_cookie )
 656                         id = bdb_idl_next( candidates, &cursor );
 657                 goto loop_begin;
 658         }
 659
 660         for ( id = bdb_idl_first( candidates, &cursor );
 661                   id != NOID ; id = bdb_idl_next( candidates, &cursor ) )
 662         {
 663                 int scopeok;
 664
 665 loop_begin:
 666
 667                 /* check for abandon */
 668                 if ( op->o_abandon ) {
 669                         rs->sr_err = SLAPD_ABANDON;
 670                         goto done;
 671                 }
 672
 673                 /* mostly needed by internal searches,
 674                  * e.g. related to syncrepl, for whom
 675                  * abandon does not get set... */
 676                 if ( slapd_shutdown ) {
 677                         rs->sr_err = LDAP_UNAVAILABLE;
 678                         send_ldap_disconnect( op, rs );
 679                         goto done;
 680                 }
 681
 682                 /* check time limit */
 683                 if ( op->ors_tlimit != SLAP_NO_LIMIT
 684                                 && slap_get_time() > stoptime )
 685                 {
 686                         rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 687                         rs->sr_ref = rs->sr_v2ref;
 688                         send_ldap_result( op, rs );
 689                         rs->sr_err = LDAP_SUCCESS;
 690                         goto done;
 691                 }
 692
 693                 /* If we inspect more entries than will
 694                  * fit into the entry cache, stop caching
 695                  * any subsequent entries
 696                  */
 697                 nentries++;
 698                 if ( nentries > bdb->bi_cache.c_maxsize && !idflag ) {
 699                         idflag = ID_NOCACHE;
 700                 }
 701
 702 fetch_entry_retry:
 703                 /* get the entry with reader lock */
 704                 ei = NULL;
 705                 rs->sr_err = bdb_cache_find_id( op, ltid,
 706                         id, &ei, idflag, &lock );
 707
 708                 if (rs->sr_err == LDAP_BUSY) {
 709                         rs->sr_text = "ldap server busy";
 710                         send_ldap_result( op, rs );
 711                         goto done;
 712
 713                 } else if ( rs->sr_err == DB_LOCK_DEADLOCK ) {
 714                         if ( !opinfo ) {
 715                                 ltid->flags &= ~TXN_DEADLOCK;
 716                                 goto fetch_entry_retry;
 717                         }
 718                         opinfo->boi_err = rs->sr_err;
 719                         send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
 720                         goto done;
 721
 722                 } else if ( rs->sr_err == DB_LOCK_NOTGRANTED )
 723                 {
 724                         goto fetch_entry_retry;
 725                 } else if ( rs->sr_err == LDAP_OTHER ) {
 726                         rs->sr_text = "internal error";
 727                         send_ldap_result( op, rs );
 728                         goto done;
 729                 }
 730
 731                 if ( ei && rs->sr_err == LDAP_SUCCESS ) {
 732                         e = ei->bei_e;
 733                 } else {
 734                         e = NULL;
 735                 }
 736
 737                 if ( e == NULL ) {
 738                         if( !BDB_IDL_IS_RANGE(candidates) ) {
 739                                 /* only complain for non-range IDLs */
 740                                 Debug( LDAP_DEBUG_TRACE,
 741                                         LDAP_XSTRING(bdb_search)
 742                                         ": candidate %ld not found\n",
 743                                         (long) id, 0, 0 );
 744                         }
 745
 746                         goto loop_continue;
 747                 }
 748
 749                 rs->sr_entry = e;
 750
 751                 if ( is_entry_subentry( e ) ) {
 752                         if( op->oq_search.rs_scope != LDAP_SCOPE_BASE ) {
 753                                 if(!get_subentries_visibility( op )) {
 754                                         /* only subentries are visible */
 755                                         goto loop_continue;
 756                                 }
 757
 758                         } else if ( get_subentries( op ) &&
 759                                 !get_subentries_visibility( op ))
 760                         {
 761                                 /* only subentries are visible */
 762                                 goto loop_continue;
 763                         }
 764
 765                 } else if ( get_subentries_visibility( op )) {
 766                         /* only subentries are visible */
 767                         goto loop_continue;
 768                 }
 769
 770                 /* Does this candidate actually satisfy the search scope?
 771                  *
 772                  * Note that we don't lock access to the bei_parent pointer.
 773                  * Since only leaf nodes can be deleted, the parent of any
 774                  * node will always be a valid node. Also since we have
 775                  * a Read lock on the data, it cannot be renamed out of the
 776                  * scope while we are looking at it, and unless we're using
 777                  * BDB_HIER, its parents cannot be moved either.
 778                  */
 779                 scopeok = 0;
 780                 switch( op->ors_scope ) {
 781                 case LDAP_SCOPE_BASE:
 782                         /* This is always true, yes? */
 783                         if ( id == base.e_id ) scopeok = 1;
 784                         break;
 785
 786                 case LDAP_SCOPE_ONELEVEL:
 787                         if ( ei->bei_parent->bei_id == base.e_id ) scopeok = 1;
 788                         break;
 789
 790 #ifdef LDAP_SCOPE_CHILDREN
 791                 case LDAP_SCOPE_CHILDREN:
 792                         if ( id == base.e_id ) break;
 793                         /* Fall-thru */
 794 #endif
 795                 case LDAP_SCOPE_SUBTREE: {
 796                         EntryInfo *tmp;
 797                         for ( tmp = BEI(e); tmp; tmp = tmp->bei_parent ) {
 798                                 if ( tmp->bei_id == base.e_id ) {
 799                                         scopeok = 1;
 800                                         break;
 801                                 }
 802                         }
 803                         } break;
 804                 }
 805
 806                 /* aliases were already dereferenced in candidate list */
 807                 if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
 808                         /* but if the search base is an alias, and we didn't
 809                          * deref it when finding, return it.
 810                          */
 811                         if ( is_entry_alias(e) &&
 812                                 ((op->ors_deref & LDAP_DEREF_FINDING) ||
 813                                         !bvmatch(&e->e_nname, &op->o_req_ndn)))
 814                         {
 815                                 goto loop_continue;
 816                         }
 817
 818                         /* scopes is only non-empty for onelevel or subtree */
 819                         if ( !scopeok && BDB_IDL_N(scopes) ) {
 820                                 unsigned x;
 821                                 if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) {
 822                                         x = bdb_idl_search( scopes, e->e_id );
 823                                         if ( scopes[x] == e->e_id ) scopeok = 1;
 824                                 } else {
 825                                         /* subtree, walk up the tree */
 826                                         EntryInfo *tmp = BEI(e);
 827                                         for (;tmp->bei_parent; tmp=tmp->bei_parent) {
 828                                                 x = bdb_idl_search( scopes, tmp->bei_id );
 829                                                 if ( scopes[x] == tmp->bei_id ) {
 830                                                         scopeok = 1;
 831                                                         break;
 832                                                 }
 833                                         }
 834                                 }
 835                         }
 836                 }
 837
 838                 /* Not in scope, ignore it */
 839                 if ( !scopeok )
 840                 {
 841                         Debug( LDAP_DEBUG_TRACE,
 842                                 LDAP_XSTRING(bdb_search)
 843                                 ": %ld scope not okay\n",
 844                                 (long) id, 0, 0 );
 845                         goto loop_continue;
 846                 }
 847
 848                 /*
 849                  * if it's a referral, add it to the list of referrals. only do
 850                  * this for non-base searches, and don't check the filter
 851                  * explicitly here since it's only a candidate anyway.
 852                  */
 853                 if ( !manageDSAit && op->oq_search.rs_scope != LDAP_SCOPE_BASE
 854                         && is_entry_referral( e ) )
 855                 {
 856                         struct bdb_op_info bois;
 857                         struct bdb_lock_info blis;
 858                         BerVarray erefs = get_entry_referrals( op, e );
 859                         rs->sr_ref = referral_rewrite( erefs, &e->e_name, NULL,
 860                                 op->oq_search.rs_scope == LDAP_SCOPE_ONELEVEL
 861                                         ? LDAP_SCOPE_BASE : LDAP_SCOPE_SUBTREE );
 862
 863                         /* Must set lockinfo so that entry_release will work */
 864                         if (!opinfo) {
 865                                 bois.boi_oe.oe_key = bdb;
 866                                 bois.boi_txn = NULL;
 867                                 bois.boi_err = 0;
 868                                 bois.boi_acl_cache = op->o_do_not_cache;
 869                                 bois.boi_flag = BOI_DONTFREE;
 870                                 bois.boi_locks = &blis;
 871                                 blis.bli_next = NULL;
 872                                 LDAP_SLIST_INSERT_HEAD( &op->o_extra, &bois.boi_oe,
 873                                         oe_next );
 874                         } else {
 875                                 blis.bli_next = opinfo->boi_locks;
 876                                 opinfo->boi_locks = &blis;
 877                         }
 878                         blis.bli_id = e->e_id;
 879                         blis.bli_lock = lock;
 880                         blis.bli_flag = BLI_DONTFREE;
 881
 882                         rs->sr_flags = REP_ENTRY_MUSTRELEASE;
 883
 884                         send_search_reference( op, rs );
 885
 886                         if ( blis.bli_flag ) {
 887 #ifdef SLAP_ZONE_ALLOC
 888                                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 889 #endif
 890                                 bdb_cache_return_entry_r(bdb, e, &lock);
 891                                 if ( opinfo ) {
 892                                         opinfo->boi_locks = blis.bli_next;
 893                                 } else {
 894                                         LDAP_SLIST_REMOVE( &op->o_extra, &bois.boi_oe,
 895                                                 OpExtra, oe_next );
 896                                 }
 897                         }
 898                         rs->sr_entry = NULL;
 899                         e = NULL;
 900
 901                         ber_bvarray_free( rs->sr_ref );
 902                         ber_bvarray_free( erefs );
 903                         rs->sr_ref = NULL;
 904
 905                         goto loop_continue;
 906                 }
 907
 908                 if ( !manageDSAit && is_entry_glue( e )) {
 909                         goto loop_continue;
 910                 }
 911
 912                 /* if it matches the filter and scope, send it */
 913                 rs->sr_err = test_filter( op, rs->sr_entry, op->oq_search.rs_filter );
 914
 915                 if ( rs->sr_err == LDAP_COMPARE_TRUE ) {
 916                         /* check size limit */
 917                         if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
 918                                 if ( rs->sr_nentries >= ((PagedResultsState *)op->o_pagedresults_state)->ps_size ) {
 919 #ifdef SLAP_ZONE_ALLOC
 920                                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 921 #endif
 922                                         bdb_cache_return_entry_r( bdb, e, &lock );
 923                                         e = NULL;
 924                                         send_paged_response( op, rs, &lastid, tentries );
 925                                         goto done;
 926                                 }
 927                                 lastid = id;
 928                         }
 929
 930                         if (e) {
 931                                 struct bdb_op_info bois;
 932                                 struct bdb_lock_info blis;
 933
 934                                 /* Must set lockinfo so that entry_release will work */
 935                                 if (!opinfo) {
 936                                         bois.boi_oe.oe_key = bdb;
 937                                         bois.boi_txn = NULL;
 938                                         bois.boi_err = 0;
 939                                         bois.boi_acl_cache = op->o_do_not_cache;
 940                                         bois.boi_flag = BOI_DONTFREE;
 941                                         bois.boi_locks = &blis;
 942                                         blis.bli_next = NULL;
 943                                         LDAP_SLIST_INSERT_HEAD( &op->o_extra, &bois.boi_oe,
 944                                                 oe_next );
 945                                 } else {
 946                                         blis.bli_next = opinfo->boi_locks;
 947                                         opinfo->boi_locks = &blis;
 948                                 }
 949                                 blis.bli_id = e->e_id;
 950                                 blis.bli_lock = lock;
 951                                 blis.bli_flag = BLI_DONTFREE;
 952
 953                                 /* safe default */
 954                                 rs->sr_attrs = op->oq_search.rs_attrs;
 955                                 rs->sr_operational_attrs = NULL;
 956                                 rs->sr_ctrls = NULL;
 957                                 rs->sr_flags = REP_ENTRY_MUSTRELEASE;
 958                                 rs->sr_err = LDAP_SUCCESS;
 959                                 rs->sr_err = send_search_entry( op, rs );
 960
 961                                 /* send_search_entry will usually free it.
 962                                  * an overlay might leave its own copy here;
 963                                  * bli_flag will be 0 if lock was already released.
 964                                  */
 965                                 if ( blis.bli_flag ) {
 966 #ifdef SLAP_ZONE_ALLOC
 967                                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 968 #endif
 969                                         bdb_cache_return_entry_r(bdb, e, &lock);
 970                                         if ( opinfo ) {
 971                                                 opinfo->boi_locks = blis.bli_next;
 972                                         } else {
 973                                                 LDAP_SLIST_REMOVE( &op->o_extra, &bois.boi_oe,
 974                                                         OpExtra, oe_next );
 975                                         }
 976                                 }
 977                                 rs->sr_entry = NULL;
 978                                 e = NULL;
 979
 980                                 switch ( rs->sr_err ) {
 981                                 case LDAP_SUCCESS:      /* entry sent ok */
 982                                         break;
 983                                 default:                /* entry not sent */
 984                                         break;
 985                                 case LDAP_UNAVAILABLE:
 986                                 case LDAP_SIZELIMIT_EXCEEDED:
 987                                         if ( rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ) {
 988                                                 rs->sr_ref = rs->sr_v2ref;
 989                                                 send_ldap_result( op, rs );
 990                                                 rs->sr_err = LDAP_SUCCESS;
 991
 992                                         } else {
 993                                                 rs->sr_err = LDAP_OTHER;
 994                                         }
 995                                         goto done;
 996                                 }
 997                         }
 998
 999                 } else {
1000                         Debug( LDAP_DEBUG_TRACE,
1001                                 LDAP_XSTRING(bdb_search)
1002                                 ": %ld does not match filter\n",
1003                                 (long) id, 0, 0 );
1004                 }
1005
1006 loop_continue:
1007                 if( e != NULL ) {
1008                         /* free reader lock */
1009 #ifdef SLAP_ZONE_ALLOC
1010                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
1011 #endif
1012                         bdb_cache_return_entry_r( bdb, e , &lock );
1013                         e = NULL;
1014                         rs->sr_entry = NULL;
1015                 }
1016         }
1017
1018 nochange:
1019         rs->sr_ctrls = NULL;
1020         rs->sr_ref = rs->sr_v2ref;
1021         rs->sr_err = (rs->sr_v2ref == NULL) ? LDAP_SUCCESS : LDAP_REFERRAL;
1022         rs->sr_rspoid = NULL;
1023         if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
1024                 send_paged_response( op, rs, NULL, 0 );
1025         } else {
1026                 send_ldap_result( op, rs );
1027         }
1028
1029         rs->sr_err = LDAP_SUCCESS;
1030
1031 done:
1032         if( rs->sr_v2ref ) {
1033                 ber_bvarray_free( rs->sr_v2ref );
1034                 rs->sr_v2ref = NULL;
1035         }
1036         if( realbase.bv_val ) ch_free( realbase.bv_val );
1037
1038         return rs->sr_err;
1039 }
1040
1041
1042 static int base_candidate(
1043         BackendDB       *be,
1044         Entry   *e,
1045         ID              *ids )
1046 {
1047         Debug(LDAP_DEBUG_ARGS, "base_candidates: base: \"%s\" (0x%08lx)\n",
1048                 e->e_nname.bv_val, (long) e->e_id, 0);
1049
1050         ids[0] = 1;
1051         ids[1] = e->e_id;
1052         return 0;
1053 }
1054
1055 /* Look for "objectClass Present" in this filter.
1056  * Also count depth of filter tree while we're at it.
1057  */
1058 static int oc_filter(
1059         Filter *f,
1060         int cur,
1061         int *max )
1062 {
1063         int rc = 0;
1064
1065         assert( f != NULL );
1066
1067         if( cur > *max ) *max = cur;
1068
1069         switch( f->f_choice ) {
1070         case LDAP_FILTER_PRESENT:
1071                 if (f->f_desc == slap_schema.si_ad_objectClass) {
1072                         rc = 1;
1073                 }
1074                 break;
1075
1076         case LDAP_FILTER_AND:
1077         case LDAP_FILTER_OR:
1078                 cur++;
1079                 for ( f=f->f_and; f; f=f->f_next ) {
1080                         (void) oc_filter(f, cur, max);
1081                 }
1082                 break;
1083
1084         default:
1085                 break;
1086         }
1087         return rc;
1088 }
1089
1090 static void search_stack_free( void *key, void *data )
1091 {
1092         ber_memfree_x(data, NULL);
1093 }
1094
1095 static void *search_stack( Operation *op )
1096 {
1097         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
1098         void *ret = NULL;
1099
1100         if ( op->o_threadctx ) {
1101                 ldap_pvt_thread_pool_getkey( op->o_threadctx, (void *)search_stack,
1102                         &ret, NULL );
1103         } else {
1104                 ret = bdb->bi_search_stack;
1105         }
1106
1107         if ( !ret ) {
1108                 ret = ch_malloc( bdb->bi_search_stack_depth * BDB_IDL_UM_SIZE
1109                         * sizeof( ID ) );
1110                 if ( op->o_threadctx ) {
1111                         ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)search_stack,
1112                                 ret, search_stack_free, NULL, NULL );
1113                 } else {
1114                         bdb->bi_search_stack = ret;
1115                 }
1116         }
1117         return ret;
1118 }
1119
1120 static int search_candidates(
1121         Operation *op,
1122         SlapReply *rs,
1123         Entry *e,
1124         DB_TXN *txn,
1125         ID      *ids,
1126         ID      *scopes )
1127 {
1128         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
1129         int rc, depth = 1;
1130         Filter          f, rf, xf, nf;
1131         ID              *stack;
1132         AttributeAssertion aa_ref = ATTRIBUTEASSERTION_INIT;
1133         Filter  sf;
1134         AttributeAssertion aa_subentry = ATTRIBUTEASSERTION_INIT;
1135
1136         /*
1137          * This routine takes as input a filter (user-filter)
1138          * and rewrites it as follows:
1139          *      (&(scope=DN)[(objectClass=subentry)]
1140          *              (|[(objectClass=referral)(objectClass=alias)](user-filter))
1141          */
1142
1143         Debug(LDAP_DEBUG_TRACE,
1144                 "search_candidates: base=\"%s\" (0x%08lx) scope=%d\n",
1145                 e->e_nname.bv_val, (long) e->e_id, op->oq_search.rs_scope );
1146
1147         xf.f_or = op->oq_search.rs_filter;
1148         xf.f_choice = LDAP_FILTER_OR;
1149         xf.f_next = NULL;
1150
1151         /* If the user's filter uses objectClass=*,
1152          * these clauses are redundant.
1153          */
1154         if (!oc_filter(op->oq_search.rs_filter, 1, &depth)
1155                 && !get_subentries_visibility(op)) {
1156                 if( !get_manageDSAit(op) && !get_domainScope(op) ) {
1157                         /* match referral objects */
1158                         struct berval bv_ref = BER_BVC( "referral" );
1159                         rf.f_choice = LDAP_FILTER_EQUALITY;
1160                         rf.f_ava = &aa_ref;
1161                         rf.f_av_desc = slap_schema.si_ad_objectClass;
1162                         rf.f_av_value = bv_ref;
1163                         rf.f_next = xf.f_or;
1164                         xf.f_or = &rf;
1165                         depth++;
1166                 }
1167         }
1168
1169         f.f_next = NULL;
1170         f.f_choice = LDAP_FILTER_AND;
1171         f.f_and = &nf;
1172         /* Dummy; we compute scope separately now */
1173         nf.f_choice = SLAPD_FILTER_COMPUTED;
1174         nf.f_result = LDAP_SUCCESS;
1175         nf.f_next = ( xf.f_or == op->oq_search.rs_filter )
1176                 ? op->oq_search.rs_filter : &xf ;
1177         /* Filter depth increased again, adding dummy clause */
1178         depth++;
1179
1180         if( get_subentries_visibility( op ) ) {
1181                 struct berval bv_subentry = BER_BVC( "subentry" );
1182                 sf.f_choice = LDAP_FILTER_EQUALITY;
1183                 sf.f_ava = &aa_subentry;
1184                 sf.f_av_desc = slap_schema.si_ad_objectClass;
1185                 sf.f_av_value = bv_subentry;
1186                 sf.f_next = nf.f_next;
1187                 nf.f_next = &sf;
1188         }
1189
1190         /* Allocate IDL stack, plus 1 more for former tmp */
1191         if ( depth+1 > bdb->bi_search_stack_depth ) {
1192                 stack = ch_malloc( (depth + 1) * BDB_IDL_UM_SIZE * sizeof( ID ) );
1193         } else {
1194                 stack = search_stack( op );
1195         }
1196
1197         if( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1198                 rc = search_aliases( op, rs, e, txn, ids, scopes, stack );
1199         } else {
1200                 rc = bdb_dn2idl( op, txn, &e->e_nname, BEI(e), ids, stack );
1201         }
1202
1203         if ( rc == LDAP_SUCCESS ) {
1204                 rc = bdb_filter_candidates( op, txn, &f, ids,
1205                         stack, stack+BDB_IDL_UM_SIZE );
1206         }
1207
1208         if ( depth+1 > bdb->bi_search_stack_depth ) {
1209                 ch_free( stack );
1210         }
1211
1212         if( rc ) {
1213                 Debug(LDAP_DEBUG_TRACE,
1214                         "bdb_search_candidates: failed (rc=%d)\n",
1215                         rc, NULL, NULL );
1216
1217         } else {
1218                 Debug(LDAP_DEBUG_TRACE,
1219                         "bdb_search_candidates: id=%ld first=%ld last=%ld\n",
1220                         (long) ids[0],
1221                         (long) BDB_IDL_FIRST(ids),
1222                         (long) BDB_IDL_LAST(ids) );
1223         }
1224
1225         return rc;
1226 }
1227
1228 static int
1229 parse_paged_cookie( Operation *op, SlapReply *rs )
1230 {
1231         int             rc = LDAP_SUCCESS;
1232         PagedResultsState *ps = op->o_pagedresults_state;
1233
1234         /* this function must be invoked only if the pagedResults
1235          * control has been detected, parsed and partially checked
1236          * by the frontend */
1237         assert( get_pagedresults( op ) > SLAP_CONTROL_IGNORED );
1238
1239         /* cookie decoding/checks deferred to backend... */
1240         if ( ps->ps_cookieval.bv_len ) {
1241                 PagedResultsCookie reqcookie;
1242                 if( ps->ps_cookieval.bv_len != sizeof( reqcookie ) ) {
1243                         /* bad cookie */
1244                         rs->sr_text = "paged results cookie is invalid";
1245                         rc = LDAP_PROTOCOL_ERROR;
1246                         goto done;
1247                 }
1248
1249                 AC_MEMCPY( &reqcookie, ps->ps_cookieval.bv_val, sizeof( reqcookie ));
1250
1251                 if ( reqcookie > ps->ps_cookie ) {
1252                         /* bad cookie */
1253                         rs->sr_text = "paged results cookie is invalid";
1254                         rc = LDAP_PROTOCOL_ERROR;
1255                         goto done;
1256
1257                 } else if ( reqcookie < ps->ps_cookie ) {
1258                         rs->sr_text = "paged results cookie is invalid or old";
1259                         rc = LDAP_UNWILLING_TO_PERFORM;
1260                         goto done;
1261                 }
1262
1263         }
1264
1265 done:;
1266
1267         return rc;
1268 }
1269
1270 static void
1271 send_paged_response(
1272         Operation       *op,
1273         SlapReply       *rs,
1274         ID              *lastid,
1275         int             tentries )
1276 {
1277         LDAPControl     ctrl, *ctrls[2];
1278         BerElementBuffer berbuf;
1279         BerElement      *ber = (BerElement *)&berbuf;
1280         PagedResultsCookie respcookie;
1281         struct berval cookie;
1282
1283         Debug(LDAP_DEBUG_ARGS,
1284                 "send_paged_response: lastid=0x%08lx nentries=%d\n",
1285                 lastid ? *lastid : 0, rs->sr_nentries, NULL );
1286
1287         BER_BVZERO( &ctrl.ldctl_value );
1288         ctrls[0] = &ctrl;
1289         ctrls[1] = NULL;
1290
1291         ber_init2( ber, NULL, LBER_USE_DER );
1292
1293         if ( lastid ) {
1294                 respcookie = ( PagedResultsCookie )(*lastid);
1295                 cookie.bv_len = sizeof( respcookie );
1296                 cookie.bv_val = (char *)&respcookie;
1297
1298         } else {
1299                 respcookie = ( PagedResultsCookie )0;
1300                 BER_BVSTR( &cookie, "" );
1301         }
1302
1303         op->o_conn->c_pagedresults_state.ps_cookie = respcookie;
1304         op->o_conn->c_pagedresults_state.ps_count =
1305                 ((PagedResultsState *)op->o_pagedresults_state)->ps_count +
1306                 rs->sr_nentries;
1307
1308         /* return size of 0 -- no estimate */
1309         ber_printf( ber, "{iO}", 0, &cookie );
1310
1311         if ( ber_flatten2( ber, &ctrls[0]->ldctl_value, 0 ) == -1 ) {
1312                 goto done;
1313         }
1314
1315         ctrls[0]->ldctl_oid = LDAP_CONTROL_PAGEDRESULTS;
1316         ctrls[0]->ldctl_iscritical = 0;
1317
1318         rs->sr_ctrls = ctrls;
1319         rs->sr_err = LDAP_SUCCESS;
1320         send_ldap_result( op, rs );
1321         rs->sr_ctrls = NULL;
1322
1323 done:
1324         (void) ber_free_buf( ber );
1325 }
1326