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         u_int32_t locker,
  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         u_int32_t locker,
  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, NULL, &ndn, &ei,
 105                         0, locker, &lockr );
 106
 107                 if ( ei ) {
 108                         e = ei->bei_e;
 109                 } else {
 110                         e = NULL;
 111                 }
 112
 113                 if (!e) {
 114                         rs->sr_err = LDAP_ALIAS_PROBLEM;
 115                         rs->sr_text = "aliasedObject not found";
 116                         break;
 117                 }
 118
 119                 /* Free the previous entry, continue to work with the
 120                  * one we just retrieved.
 121                  */
 122                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache,
 123                         *matched, lock);
 124                 *lock = lockr;
 125
 126                 /* We found a regular entry. Return this to the caller. The
 127                  * entry is still locked for Read.
 128                  */
 129                 if (!is_entry_alias(e)) {
 130                         rs->sr_err = LDAP_SUCCESS;
 131                         rs->sr_text = NULL;
 132                         break;
 133                 }
 134         }
 135         return e;
 136 }
 137
 138 /* Look for and dereference all aliases within the search scope. Adds
 139  * the dereferenced entries to the "ids" list. Requires "stack" to be
 140  * able to hold 8 levels of DB_SIZE IDLs. Of course we're hardcoded to
 141  * require a minimum of 8 UM_SIZE IDLs so this is never a problem.
 142  */
 143 static int search_aliases(
 144         Operation *op,
 145         SlapReply *rs,
 146         Entry *e,
 147         u_int32_t locker,
 148         ID *ids,
 149         ID *scopes,
 150         ID *stack )
 151 {
 152         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 153         ID *aliases, *curscop, *subscop, *visited, *newsubs, *oldsubs, *tmp;
 154         ID cursora, ida, cursoro, ido, *subscop2;
 155         Entry *matched, *a;
 156         EntryInfo *ei;
 157         struct berval bv_alias = BER_BVC( "alias" );
 158 #ifdef LDAP_COMP_MATCH
 159         AttributeAssertion aa_alias = { NULL, BER_BVNULL, NULL };
 160 #else
 161         AttributeAssertion aa_alias = { NULL, BER_BVNULL };
 162 #endif
 163         Filter  af;
 164         DB_LOCK locka, lockr;
 165         int first = 1;
 166
 167         aliases = stack;        /* IDL of all aliases in the database */
 168         curscop = aliases + BDB_IDL_DB_SIZE;    /* Aliases in the current scope */
 169         subscop = curscop + BDB_IDL_DB_SIZE;    /* The current scope */
 170         visited = subscop + BDB_IDL_DB_SIZE;    /* IDs we've seen in this search */
 171         newsubs = visited + BDB_IDL_DB_SIZE;    /* New subtrees we've added */
 172         oldsubs = newsubs + BDB_IDL_DB_SIZE;    /* Subtrees added previously */
 173         tmp = oldsubs + BDB_IDL_DB_SIZE;        /* Scratch space for deref_base() */
 174
 175         /* A copy of subscop, because subscop gets clobbered by
 176          * the bdb_idl_union/intersection routines
 177          */
 178         subscop2 = tmp + BDB_IDL_DB_SIZE;
 179
 180         af.f_choice = LDAP_FILTER_EQUALITY;
 181         af.f_ava = &aa_alias;
 182         af.f_av_desc = slap_schema.si_ad_objectClass;
 183         af.f_av_value = bv_alias;
 184         af.f_next = NULL;
 185
 186         /* Find all aliases in database */
 187         BDB_IDL_ZERO( aliases );
 188         rs->sr_err = bdb_filter_candidates( op, &af, aliases,
 189                 curscop, visited );
 190         if (rs->sr_err != LDAP_SUCCESS) {
 191                 return rs->sr_err;
 192         }
 193         oldsubs[0] = 1;
 194         oldsubs[1] = e->e_id;
 195
 196         BDB_IDL_ZERO( ids );
 197         BDB_IDL_ZERO( visited );
 198         BDB_IDL_ZERO( newsubs );
 199
 200         cursoro = 0;
 201         ido = bdb_idl_first( oldsubs, &cursoro );
 202
 203         for (;;) {
 204                 /* Set curscop to only the aliases in the current scope. Start with
 205                  * all the aliases, obtain the IDL for the current scope, and then
 206                  * get the intersection of these two IDLs. Add the current scope
 207                  * to the cumulative list of candidates.
 208                  */
 209                 BDB_IDL_CPY( curscop, aliases );
 210                 rs->sr_err = bdb_dn2idl( op, e, subscop,
 211                         subscop2+BDB_IDL_DB_SIZE );
 212                 if (first) {
 213                         first = 0;
 214                 } else {
 215                         bdb_cache_return_entry_r (bdb->bi_dbenv, &bdb->bi_cache, e, &locka);
 216                 }
 217                 BDB_IDL_CPY(subscop2, subscop);
 218                 rs->sr_err = bdb_idl_intersection(curscop, subscop);
 219                 bdb_idl_union( ids, subscop2 );
 220
 221                 /* Dereference all of the aliases in the current scope. */
 222                 cursora = 0;
 223                 for (ida = bdb_idl_first(curscop, &cursora); ida != NOID;
 224                         ida = bdb_idl_next(curscop, &cursora))
 225                 {
 226                         ei = NULL;
 227 retry1:
 228                         rs->sr_err = bdb_cache_find_id(op, NULL,
 229                                 ida, &ei, 0, locker, &lockr );
 230                         if (rs->sr_err != LDAP_SUCCESS) {
 231                                 if ( rs->sr_err == DB_LOCK_DEADLOCK ||
 232                                         rs->sr_err == DB_LOCK_NOTGRANTED ) goto retry1;
 233                                 continue;
 234                         }
 235                         a = ei->bei_e;
 236
 237                         /* This should only happen if the curscop IDL has maxed out and
 238                          * turned into a range that spans IDs indiscriminately
 239                          */
 240                         if (!is_entry_alias(a)) {
 241                                 bdb_cache_return_entry_r (bdb->bi_dbenv, &bdb->bi_cache,
 242                                         a, &lockr);
 243                                 continue;
 244                         }
 245
 246                         /* Actually dereference the alias */
 247                         BDB_IDL_ZERO(tmp);
 248                         a = deref_base( op, rs, a, &matched, locker, &lockr,
 249                                 tmp, visited );
 250                         if (a) {
 251                                 /* If the target was not already in our current candidates,
 252                                  * make note of it in the newsubs list. Also
 253                                  * set it in the scopes list so that bdb_search
 254                                  * can check it.
 255                                  */
 256                                 if (bdb_idl_insert(ids, a->e_id) == 0) {
 257                                         bdb_idl_insert(newsubs, a->e_id);
 258                                         bdb_idl_insert(scopes, a->e_id);
 259                                 }
 260                                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache,
 261                                         a, &lockr);
 262
 263                         } else if (matched) {
 264                                 /* Alias could not be dereferenced, or it deref'd to
 265                                  * an ID we've already seen. Ignore it.
 266                                  */
 267                                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache,
 268                                         matched, &lockr );
 269                                 rs->sr_text = NULL;
 270                         }
 271                 }
 272                 /* If this is a OneLevel search, we're done; oldsubs only had one
 273                  * ID in it. For a Subtree search, oldsubs may be a list of scope IDs.
 274                  */
 275                 if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) break;
 276 nextido:
 277                 ido = bdb_idl_next( oldsubs, &cursoro );
 278
 279                 /* If we're done processing the old scopes, did we add any new
 280                  * scopes in this iteration? If so, go back and do those now.
 281                  */
 282                 if (ido == NOID) {
 283                         if (BDB_IDL_IS_ZERO(newsubs)) break;
 284                         BDB_IDL_CPY(oldsubs, newsubs);
 285                         BDB_IDL_ZERO(newsubs);
 286                         cursoro = 0;
 287                         ido = bdb_idl_first( oldsubs, &cursoro );
 288                 }
 289
 290                 /* Find the entry corresponding to the next scope. If it can't
 291                  * be found, ignore it and move on. This should never happen;
 292                  * we should never see the ID of an entry that doesn't exist.
 293                  * Set the name so that the scope's IDL can be retrieved.
 294                  */
 295                 ei = NULL;
 296 sameido:
 297                 rs->sr_err = bdb_cache_find_id(op, NULL, ido, &ei,
 298                         0, locker, &locka );
 299                 if ( rs->sr_err != LDAP_SUCCESS ) {
 300                         if ( rs->sr_err == DB_LOCK_DEADLOCK ||
 301                                 rs->sr_err == DB_LOCK_NOTGRANTED )
 302                                 goto sameido;
 303                         goto nextido;
 304                 }
 305                 e = ei->bei_e;
 306         }
 307         return rs->sr_err;
 308 }
 309
 310 int
 311 bdb_search( Operation *op, SlapReply *rs )
 312 {
 313         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 314         time_t          stoptime;
 315         ID              id, cursor;
 316         ID              candidates[BDB_IDL_UM_SIZE];
 317         ID              scopes[BDB_IDL_DB_SIZE];
 318         Entry           *e = NULL, base, e_root = {0};
 319         Entry           *matched = NULL;
 320         EntryInfo       *ei, ei_root = {0};
 321         struct berval   realbase = BER_BVNULL;
 322 #ifdef SLAP_ACL_HONOR_DISCLOSE
 323         slap_mask_t     mask;
 324 #endif
 325         int             manageDSAit;
 326         int             tentries = 0;
 327         ID              lastid = NOID;
 328         AttributeName   *attrs;
 329
 330         u_int32_t       locker = 0;
 331         DB_LOCK         lock;
 332         struct  bdb_op_info     *opinfo = NULL;
 333         DB_TXN                  *ltid = NULL;
 334
 335         Debug( LDAP_DEBUG_TRACE, "=> " LDAP_XSTRING(bdb_search) "\n", 0, 0, 0);
 336         attrs = op->oq_search.rs_attrs;
 337
 338         opinfo = (struct bdb_op_info *) op->o_private;
 339
 340         manageDSAit = get_manageDSAit( op );
 341
 342         if ( opinfo && opinfo->boi_txn ) {
 343                 ltid = opinfo->boi_txn;
 344                 locker = TXN_ID( ltid );
 345         } else {
 346                 rs->sr_err = LOCK_ID( bdb->bi_dbenv, &locker );
 347
 348                 switch(rs->sr_err) {
 349                 case 0:
 350                         break;
 351                 default:
 352                         send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 353                         return rs->sr_err;
 354                 }
 355         }
 356
 357         if ( op->o_req_ndn.bv_len == 0 ) {
 358                 /* DIT root special case */
 359                 ei_root.bei_e = &e_root;
 360                 ei_root.bei_parent = &ei_root;
 361                 e_root.e_private = &ei_root;
 362                 e_root.e_id = 0;
 363                 e_root.e_ocflags = SLAP_OC_GLUE | SLAP_OC__END;
 364                 BER_BVSTR( &e_root.e_nname, "" );
 365                 BER_BVSTR( &e_root.e_name, "" );
 366                 ei = &ei_root;
 367                 rs->sr_err = LDAP_SUCCESS;
 368         } else {
 369                 if ( op->ors_deref & LDAP_DEREF_FINDING ) {
 370                         BDB_IDL_ZERO(candidates);
 371                 }
 372 dn2entry_retry:
 373                 /* get entry with reader lock */
 374                 rs->sr_err = bdb_dn2entry( op, ltid, &op->o_req_ndn, &ei,
 375                         1, locker, &lock );
 376         }
 377
 378         switch(rs->sr_err) {
 379         case DB_NOTFOUND:
 380                 matched = ei->bei_e;
 381                 break;
 382         case 0:
 383                 e = ei->bei_e;
 384                 break;
 385         case LDAP_BUSY:
 386                 send_ldap_error( op, rs, LDAP_BUSY, "ldap server busy" );
 387                 if ( !opinfo )
 388                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 389                 return LDAP_BUSY;
 390         case DB_LOCK_DEADLOCK:
 391         case DB_LOCK_NOTGRANTED:
 392                 goto dn2entry_retry;
 393         default:
 394                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 395                 if ( !opinfo )
 396                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 397                 return rs->sr_err;
 398         }
 399
 400         if ( op->ors_deref & LDAP_DEREF_FINDING ) {
 401                 if ( matched && is_entry_alias( matched )) {
 402                         struct berval stub;
 403
 404                         stub.bv_val = op->o_req_ndn.bv_val;
 405                         stub.bv_len = op->o_req_ndn.bv_len - matched->e_nname.bv_len - 1;
 406                         e = deref_base( op, rs, matched, &matched, locker, &lock,
 407                                 candidates, NULL );
 408                         if ( e ) {
 409                                 build_new_dn( &op->o_req_ndn, &e->e_nname, &stub,
 410                                         op->o_tmpmemctx );
 411                                 bdb_cache_return_entry_r (bdb->bi_dbenv, &bdb->bi_cache,
 412                                         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, locker, &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 #ifdef SLAP_ACL_HONOR_DISCLOSE
 429                         /* return referral only if "disclose"
 430                          * is granted on the object */
 431                         if ( ! access_allowed( op, matched,
 432                                                 slap_schema.si_ad_entry,
 433                                                 NULL, ACL_DISCLOSE, NULL ) )
 434                         {
 435                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 436
 437                         } else
 438 #endif /* SLAP_ACL_HONOR_DISCLOSE */
 439                         {
 440                                 ber_dupbv( &matched_dn, &matched->e_name );
 441
 442                                 erefs = is_entry_referral( matched )
 443                                         ? get_entry_referrals( op, matched )
 444                                         : NULL;
 445                                 if ( rs->sr_err == DB_NOTFOUND )
 446                                         rs->sr_err = LDAP_REFERRAL;
 447                                 rs->sr_matched = matched_dn.bv_val;
 448                         }
 449
 450 #ifdef SLAP_ZONE_ALLOC
 451                         slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
 452 #endif
 453                         bdb_cache_return_entry_r (bdb->bi_dbenv, &bdb->bi_cache,
 454                                 matched, &lock);
 455                         matched = NULL;
 456
 457                         if ( erefs ) {
 458                                 rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 459                                         &op->o_req_dn, op->oq_search.rs_scope );
 460                                 ber_bvarray_free( erefs );
 461                         }
 462
 463                 } else {
 464 #ifdef SLAP_ZONE_ALLOC
 465                         slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
 466 #endif
 467                         rs->sr_ref = referral_rewrite( default_referral,
 468                                 NULL, &op->o_req_dn, op->oq_search.rs_scope );
 469                         rs->sr_err = rs->sr_ref != NULL ? LDAP_REFERRAL : LDAP_NO_SUCH_OBJECT;
 470                 }
 471
 472                 send_ldap_result( op, rs );
 473
 474                 if ( !opinfo )
 475                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 476                 if ( rs->sr_ref ) {
 477                         ber_bvarray_free( rs->sr_ref );
 478                         rs->sr_ref = NULL;
 479                 }
 480                 if ( !BER_BVISNULL( &matched_dn ) ) {
 481                         ber_memfree( matched_dn.bv_val );
 482                         rs->sr_matched = NULL;
 483                 }
 484                 return rs->sr_err;
 485         }
 486
 487 #ifdef SLAP_ACL_HONOR_DISCLOSE
 488         /* NOTE: __NEW__ "search" access is required
 489          * on searchBase object */
 490         if ( ! access_allowed_mask( op, e, slap_schema.si_ad_entry,
 491                                 NULL, ACL_SEARCH, NULL, &mask ) )
 492         {
 493                 if ( !ACL_GRANT( mask, ACL_DISCLOSE ) ) {
 494                         rs->sr_err = LDAP_NO_SUCH_OBJECT;
 495                 } else {
 496                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
 497                 }
 498
 499 #ifdef SLAP_ZONE_ALLOC
 500                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 501 #endif
 502                 if ( e != &e_root ) {
 503                         bdb_cache_return_entry_r(bdb->bi_dbenv, &bdb->bi_cache, e, &lock);
 504                 }
 505                 send_ldap_result( op, rs );
 506                 return rs->sr_err;
 507         }
 508 #endif /* SLAP_ACL_HONOR_DISCLOSE */
 509
 510         if ( !manageDSAit && e != &e_root && is_entry_referral( e ) ) {
 511                 /* entry is a referral, don't allow add */
 512                 struct berval matched_dn = BER_BVNULL;
 513                 BerVarray erefs = NULL;
 514
 515                 ber_dupbv( &matched_dn, &e->e_name );
 516                 erefs = get_entry_referrals( op, e );
 517
 518                 rs->sr_err = LDAP_REFERRAL;
 519
 520 #ifdef SLAP_ZONE_ALLOC
 521                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 522 #endif
 523                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache, e, &lock );
 524                 e = NULL;
 525
 526                 if ( erefs ) {
 527                         rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 528                                 &op->o_req_dn, op->oq_search.rs_scope );
 529                         ber_bvarray_free( erefs );
 530
 531                         if ( !rs->sr_ref ) {
 532                                 rs->sr_text = "bad_referral object";
 533                         }
 534                 }
 535
 536                 Debug( LDAP_DEBUG_TRACE,
 537                         LDAP_XSTRING(bdb_search) ": entry is referral\n",
 538                         0, 0, 0 );
 539
 540                 rs->sr_matched = matched_dn.bv_val;
 541                 send_ldap_result( op, rs );
 542
 543                 if ( !opinfo ) {
 544                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 545                 }
 546                 ber_bvarray_free( rs->sr_ref );
 547                 rs->sr_ref = NULL;
 548                 ber_memfree( matched_dn.bv_val );
 549                 rs->sr_matched = NULL;
 550                 return 1;
 551         }
 552
 553         if ( get_assert( op ) &&
 554                 ( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
 555         {
 556                 rs->sr_err = LDAP_ASSERTION_FAILED;
 557 #ifdef SLAP_ZONE_ALLOC
 558                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 559 #endif
 560                 if ( e != &e_root ) {
 561                         bdb_cache_return_entry_r(bdb->bi_dbenv, &bdb->bi_cache, e, &lock);
 562                 }
 563                 send_ldap_result( op, rs );
 564                 return 1;
 565         }
 566
 567         /* compute it anyway; root does not use it */
 568         stoptime = op->o_time + op->ors_tlimit;
 569
 570         /* need normalized dn below */
 571         ber_dupbv( &realbase, &e->e_nname );
 572
 573         /* Copy info to base, must free entry before accessing the database
 574          * in search_candidates, to avoid deadlocks.
 575          */
 576         base.e_private = e->e_private;
 577         base.e_nname = realbase;
 578         base.e_id = e->e_id;
 579
 580 #ifdef SLAP_ZONE_ALLOC
 581         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 582 #endif
 583         if ( e != &e_root ) {
 584                 bdb_cache_return_entry_r(bdb->bi_dbenv, &bdb->bi_cache, e, &lock);
 585         }
 586         e = NULL;
 587
 588         /* select candidates */
 589         if ( op->oq_search.rs_scope == LDAP_SCOPE_BASE ) {
 590                 rs->sr_err = base_candidate( op->o_bd, &base, candidates );
 591
 592         } else {
 593                 BDB_IDL_ZERO( candidates );
 594                 BDB_IDL_ZERO( scopes );
 595                 rs->sr_err = search_candidates( op, rs, &base,
 596                         locker, candidates, scopes );
 597         }
 598
 599         /* start cursor at beginning of candidates.
 600          */
 601         cursor = 0;
 602
 603         if ( candidates[0] == 0 ) {
 604                 Debug( LDAP_DEBUG_TRACE,
 605                         LDAP_XSTRING(bdb_search) ": no candidates\n",
 606                         0, 0, 0 );
 607
 608                 goto nochange;
 609         }
 610
 611         /* if not root and candidates exceed to-be-checked entries, abort */
 612         if ( op->ors_limit      /* isroot == FALSE */ &&
 613                 op->ors_limit->lms_s_unchecked != -1 &&
 614                 BDB_IDL_N(candidates) > (unsigned) op->ors_limit->lms_s_unchecked )
 615         {
 616                 rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
 617                 send_ldap_result( op, rs );
 618                 rs->sr_err = LDAP_SUCCESS;
 619                 goto done;
 620         }
 621
 622         if ( op->ors_limit == NULL      /* isroot == TRUE */ ||
 623                 !op->ors_limit->lms_s_pr_hide )
 624         {
 625                 tentries = BDB_IDL_N(candidates);
 626         }
 627
 628         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 629                 PagedResultsState *ps = op->o_pagedresults_state;
 630                 /* deferred cookie parsing */
 631                 rs->sr_err = parse_paged_cookie( op, rs );
 632                 if ( rs->sr_err != LDAP_SUCCESS ) {
 633                         send_ldap_result( op, rs );
 634                         goto done;
 635                 }
 636
 637                 if ( (ID)( ps->ps_cookie ) == 0 ) {
 638                         id = bdb_idl_first( candidates, &cursor );
 639
 640                 } else {
 641                         if ( ps->ps_size == 0 ) {
 642                                 rs->sr_err = LDAP_SUCCESS;
 643                                 rs->sr_text = "search abandoned by pagedResult size=0";
 644                                 send_ldap_result( op, rs );
 645                                 goto done;
 646                         }
 647                         for ( id = bdb_idl_first( candidates, &cursor );
 648                                 id != NOID &&
 649                                         id <= (ID)( ps->ps_cookie );
 650                                 id = bdb_idl_next( candidates, &cursor ) )
 651                         {
 652                                 /* empty */;
 653                         }
 654                 }
 655
 656                 if ( cursor == NOID ) {
 657                         Debug( LDAP_DEBUG_TRACE,
 658                                 LDAP_XSTRING(bdb_search)
 659                                 ": no paged results candidates\n",
 660                                 0, 0, 0 );
 661                         send_paged_response( op, rs, &lastid, 0 );
 662
 663                         rs->sr_err = LDAP_OTHER;
 664                         goto done;
 665                 }
 666                 goto loop_begin;
 667         }
 668
 669         for ( id = bdb_idl_first( candidates, &cursor );
 670                   id != NOID ; id = bdb_idl_next( candidates, &cursor ) )
 671         {
 672                 int scopeok;
 673
 674 loop_begin:
 675
 676                 /* check for abandon */
 677                 if ( op->o_abandon ) {
 678                         rs->sr_err = SLAPD_ABANDON;
 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 fetch_entry_retry:
 694                         /* get the entry with reader lock */
 695                         ei = NULL;
 696                         rs->sr_err = bdb_cache_find_id( op, ltid,
 697                                 id, &ei, 0, locker, &lock );
 698
 699                         if (rs->sr_err == LDAP_BUSY) {
 700                                 rs->sr_text = "ldap server busy";
 701                                 send_ldap_result( op, rs );
 702                                 goto done;
 703
 704                         } else if ( rs->sr_err == DB_LOCK_DEADLOCK
 705                                 || rs->sr_err == DB_LOCK_NOTGRANTED )
 706                         {
 707                                 goto fetch_entry_retry;
 708                         }
 709
 710                         if ( ei && rs->sr_err == LDAP_SUCCESS ) {
 711                                 e = ei->bei_e;
 712                         } else {
 713                                 e = NULL;
 714                         }
 715
 716                         if ( e == NULL ) {
 717                                 if( !BDB_IDL_IS_RANGE(candidates) ) {
 718                                         /* only complain for non-range IDLs */
 719                                         Debug( LDAP_DEBUG_TRACE,
 720                                                 LDAP_XSTRING(bdb_search)
 721                                                 ": candidate %ld not found\n",
 722                                                 (long) id, 0, 0 );
 723                                 }
 724
 725                                 goto loop_continue;
 726                         }
 727
 728                 rs->sr_entry = e;
 729
 730                 if ( is_entry_subentry( e ) ) {
 731                         if( op->oq_search.rs_scope != LDAP_SCOPE_BASE ) {
 732                                 if(!get_subentries_visibility( op )) {
 733                                         /* only subentries are visible */
 734                                         goto loop_continue;
 735                                 }
 736
 737                         } else if ( get_subentries( op ) &&
 738                                 !get_subentries_visibility( op ))
 739                         {
 740                                 /* only subentries are visible */
 741                                 goto loop_continue;
 742                         }
 743
 744                 } else if ( get_subentries_visibility( op )) {
 745                         /* only subentries are visible */
 746                         goto loop_continue;
 747                 }
 748
 749                 /* Does this candidate actually satisfy the search scope?
 750                  *
 751                  * Note that we don't lock access to the bei_parent pointer.
 752                  * Since only leaf nodes can be deleted, the parent of any
 753                  * node will always be a valid node. Also since we have
 754                  * a Read lock on the data, it cannot be renamed out of the
 755                  * scope while we are looking at it, and unless we're using
 756                  * BDB_HIER, its parents cannot be moved either.
 757                  */
 758                 scopeok = 0;
 759                 switch( op->ors_scope ) {
 760                 case LDAP_SCOPE_BASE:
 761                         /* This is always true, yes? */
 762                         if ( id == base.e_id ) scopeok = 1;
 763                         break;
 764
 765                 case LDAP_SCOPE_ONELEVEL:
 766                         if ( ei->bei_parent->bei_id == base.e_id ) scopeok = 1;
 767                         break;
 768
 769 #ifdef LDAP_SCOPE_CHILDREN
 770                 case LDAP_SCOPE_CHILDREN:
 771                         if ( id == base.e_id ) break;
 772                         /* Fall-thru */
 773 #endif
 774                 case LDAP_SCOPE_SUBTREE: {
 775                         EntryInfo *tmp;
 776                         for ( tmp = BEI(e); tmp; tmp = tmp->bei_parent ) {
 777                                 if ( tmp->bei_id == base.e_id ) {
 778                                         scopeok = 1;
 779                                         break;
 780                                 }
 781                         }
 782                         } break;
 783                 }
 784
 785                 /* aliases were already dereferenced in candidate list */
 786                 if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
 787                         /* but if the search base is an alias, and we didn't
 788                          * deref it when finding, return it.
 789                          */
 790                         if ( is_entry_alias(e) &&
 791                                 ((op->ors_deref & LDAP_DEREF_FINDING) ||
 792                                         !bvmatch(&e->e_nname, &op->o_req_ndn)))
 793                         {
 794                                 goto loop_continue;
 795                         }
 796
 797                         /* scopes is only non-empty for onelevel or subtree */
 798                         if ( !scopeok && BDB_IDL_N(scopes) ) {
 799                                 unsigned x;
 800                                 if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) {
 801                                         x = bdb_idl_search( scopes, e->e_id );
 802                                         if ( scopes[x] == e->e_id ) scopeok = 1;
 803                                 } else {
 804                                         /* subtree, walk up the tree */
 805                                         EntryInfo *tmp = BEI(e);
 806                                         for (;tmp->bei_parent; tmp=tmp->bei_parent) {
 807                                                 x = bdb_idl_search( scopes, tmp->bei_id );
 808                                                 if ( scopes[x] == tmp->bei_id ) {
 809                                                         scopeok = 1;
 810                                                         break;
 811                                                 }
 812                                         }
 813                                 }
 814                         }
 815                 }
 816
 817                 /* Not in scope, ignore it */
 818                 if ( !scopeok )
 819                 {
 820                         Debug( LDAP_DEBUG_TRACE,
 821                                 LDAP_XSTRING(bdb_search)
 822                                 ": %ld scope not okay\n",
 823                                 (long) id, 0, 0 );
 824                         goto loop_continue;
 825                 }
 826
 827                 /*
 828                  * if it's a referral, add it to the list of referrals. only do
 829                  * this for non-base searches, and don't check the filter
 830                  * explicitly here since it's only a candidate anyway.
 831                  */
 832                 if ( !manageDSAit && op->oq_search.rs_scope != LDAP_SCOPE_BASE
 833                         && is_entry_referral( e ) )
 834                 {
 835                         struct bdb_op_info bois, *boi2;
 836                         struct bdb_lock_info blis;
 837                         BerVarray erefs = get_entry_referrals( op, e );
 838                         rs->sr_ref = referral_rewrite( erefs, &e->e_name, NULL,
 839                                 op->oq_search.rs_scope == LDAP_SCOPE_ONELEVEL
 840                                         ? LDAP_SCOPE_BASE : LDAP_SCOPE_SUBTREE );
 841
 842                         /* Must set lockinfo so that entry_release will work */
 843                         if (!opinfo) {
 844                                 boi2 = &bois;
 845                                 op->o_private = boi2;
 846                                 bois.boi_bdb = op->o_bd;
 847                                 bois.boi_txn = NULL;
 848                                 bois.boi_locker = locker;
 849                                 bois.boi_err = 0;
 850                                 bois.boi_locks = &blis;
 851                                 blis.bli_next = NULL;
 852                                 bois.boi_flag = BOI_DONTFREE;
 853                         } else {
 854                                 boi2 = opinfo;
 855                                 blis.bli_next = boi2->boi_locks;
 856                                 boi2->boi_locks = &blis;
 857                         }
 858                         blis.bli_id = e->e_id;
 859                         blis.bli_lock = lock;
 860                         blis.bli_flag = BLI_DONTFREE;
 861
 862                         rs->sr_flags = REP_ENTRY_MUSTRELEASE;
 863
 864                         send_search_reference( op, rs );
 865
 866                         if ( blis.bli_flag ) {
 867 #ifdef SLAP_ZONE_ALLOC
 868                                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 869 #endif
 870                                 bdb_cache_return_entry_r(bdb->bi_dbenv,
 871                                         &bdb->bi_cache, e, &lock);
 872                                 op->o_private = opinfo;
 873                                 if ( opinfo ) {
 874                                         opinfo->boi_locks = blis.bli_next;
 875                                 }
 876                         }
 877                         rs->sr_entry = NULL;
 878                         e = NULL;
 879
 880                         ber_bvarray_free( rs->sr_ref );
 881                         ber_bvarray_free( erefs );
 882                         rs->sr_ref = NULL;
 883
 884                         goto loop_continue;
 885                 }
 886
 887                 if ( !manageDSAit && is_entry_glue( e )) {
 888                         goto loop_continue;
 889                 }
 890
 891                 /* if it matches the filter and scope, send it */
 892                 rs->sr_err = test_filter( op, rs->sr_entry, op->oq_search.rs_filter );
 893
 894                 if ( rs->sr_err == LDAP_COMPARE_TRUE ) {
 895                         /* check size limit */
 896                         if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
 897                                 if ( rs->sr_nentries >= ((PagedResultsState *)op->o_pagedresults_state)->ps_size ) {
 898 #ifdef SLAP_ZONE_ALLOC
 899                                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 900 #endif
 901                                         bdb_cache_return_entry_r( bdb->bi_dbenv,
 902                                                         &bdb->bi_cache, e, &lock );
 903                                         e = NULL;
 904                                         send_paged_response( op, rs, &lastid, tentries );
 905                                         goto done;
 906                                 }
 907                                 lastid = id;
 908                         }
 909
 910                         if (e) {
 911                                 struct bdb_op_info bois, *boi2;
 912                                 struct bdb_lock_info blis;
 913
 914                                 /* Must set lockinfo so that entry_release will work */
 915                                 if (!opinfo) {
 916                                         boi2 = &bois;
 917                                         op->o_private = boi2;
 918                                         bois.boi_bdb = op->o_bd;
 919                                         bois.boi_txn = NULL;
 920                                         bois.boi_locker = locker;
 921                                         bois.boi_err = 0;
 922                                         bois.boi_locks = &blis;
 923                                         blis.bli_next = NULL;
 924                                         bois.boi_flag = BOI_DONTFREE;
 925                                 } else {
 926                                         boi2 = opinfo;
 927                                         blis.bli_next = boi2->boi_locks;
 928                                         boi2->boi_locks = &blis;
 929                                 }
 930                                 blis.bli_id = e->e_id;
 931                                 blis.bli_lock = lock;
 932                                 blis.bli_flag = BLI_DONTFREE;
 933
 934                                 /* safe default */
 935                                 rs->sr_attrs = op->oq_search.rs_attrs;
 936                                 rs->sr_operational_attrs = NULL;
 937                                 rs->sr_ctrls = NULL;
 938                                 rs->sr_flags = REP_ENTRY_MUSTRELEASE;
 939                                 rs->sr_err = LDAP_SUCCESS;
 940                                 rs->sr_err = send_search_entry( op, rs );
 941
 942                                 /* send_search_entry will usually free it.
 943                                  * an overlay might leave its own copy here;
 944                                  * bli_flag will be 0 if lock was already released.
 945                                  */
 946                                 if ( blis.bli_flag ) {
 947 #ifdef SLAP_ZONE_ALLOC
 948                                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 949 #endif
 950                                         bdb_cache_return_entry_r(bdb->bi_dbenv,
 951                                                 &bdb->bi_cache, e, &lock);
 952                                         op->o_private = opinfo;
 953                                         if ( opinfo ) {
 954                                                 opinfo->boi_locks = blis.bli_next;
 955                                         }
 956                                 }
 957                                 rs->sr_entry = NULL;
 958                                 e = NULL;
 959
 960                                 switch ( rs->sr_err ) {
 961                                 case LDAP_SUCCESS:      /* entry sent ok */
 962                                         break;
 963                                 default:                /* entry not sent */
 964                                         break;
 965                                 case LDAP_UNAVAILABLE:
 966                                 case LDAP_SIZELIMIT_EXCEEDED:
 967                                         if ( rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ) {
 968                                                 rs->sr_ref = rs->sr_v2ref;
 969                                                 send_ldap_result( op, rs );
 970                                                 rs->sr_err = LDAP_SUCCESS;
 971
 972                                         } else {
 973                                                 rs->sr_err = LDAP_OTHER;
 974                                         }
 975                                         goto done;
 976                                 }
 977                         }
 978
 979                 } else {
 980                         Debug( LDAP_DEBUG_TRACE,
 981                                 LDAP_XSTRING(bdb_search)
 982                                 ": %ld does not match filter\n",
 983                                 (long) id, 0, 0 );
 984                 }
 985
 986 loop_continue:
 987                 if( e != NULL ) {
 988                         /* free reader lock */
 989 #ifdef SLAP_ZONE_ALLOC
 990                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 991 #endif
 992                         bdb_cache_return_entry_r( bdb->bi_dbenv,
 993                                 &bdb->bi_cache, e , &lock );
 994                         e = NULL;
 995                         rs->sr_entry = NULL;
 996                 }
 997         }
 998
 999 nochange:
1000         rs->sr_ctrls = NULL;
1001         rs->sr_ref = rs->sr_v2ref;
1002         rs->sr_err = (rs->sr_v2ref == NULL) ? LDAP_SUCCESS : LDAP_REFERRAL;
1003         rs->sr_rspoid = NULL;
1004         if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
1005                 send_paged_response( op, rs, NULL, 0 );
1006         } else {
1007                 send_ldap_result( op, rs );
1008         }
1009
1010         rs->sr_err = LDAP_SUCCESS;
1011
1012 done:
1013         if ( !opinfo )
1014                 LOCK_ID_FREE( bdb->bi_dbenv, locker );
1015
1016         if( rs->sr_v2ref ) {
1017                 ber_bvarray_free( rs->sr_v2ref );
1018                 rs->sr_v2ref = NULL;
1019         }
1020         if( realbase.bv_val ) ch_free( realbase.bv_val );
1021
1022         return rs->sr_err;
1023 }
1024
1025
1026 static int base_candidate(
1027         BackendDB       *be,
1028         Entry   *e,
1029         ID              *ids )
1030 {
1031         Debug(LDAP_DEBUG_ARGS, "base_candidates: base: \"%s\" (0x%08lx)\n",
1032                 e->e_nname.bv_val, (long) e->e_id, 0);
1033
1034         ids[0] = 1;
1035         ids[1] = e->e_id;
1036         return 0;
1037 }
1038
1039 /* Look for "objectClass Present" in this filter.
1040  * Also count depth of filter tree while we're at it.
1041  */
1042 static int oc_filter(
1043         Filter *f,
1044         int cur,
1045         int *max )
1046 {
1047         int rc = 0;
1048
1049         assert( f != NULL );
1050
1051         if( cur > *max ) *max = cur;
1052
1053         switch( f->f_choice ) {
1054         case LDAP_FILTER_PRESENT:
1055                 if (f->f_desc == slap_schema.si_ad_objectClass) {
1056                         rc = 1;
1057                 }
1058                 break;
1059
1060         case LDAP_FILTER_AND:
1061         case LDAP_FILTER_OR:
1062                 cur++;
1063                 for ( f=f->f_and; f; f=f->f_next ) {
1064                         (void) oc_filter(f, cur, max);
1065                 }
1066                 break;
1067
1068         default:
1069                 break;
1070         }
1071         return rc;
1072 }
1073
1074 static void search_stack_free( void *key, void *data )
1075 {
1076         ber_memfree_x(data, NULL);
1077 }
1078
1079 static void *search_stack( Operation *op )
1080 {
1081         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
1082         void *ret = NULL;
1083
1084         if ( op->o_threadctx ) {
1085                 ldap_pvt_thread_pool_getkey( op->o_threadctx, search_stack,
1086                         &ret, NULL );
1087         } else {
1088                 ret = bdb->bi_search_stack;
1089         }
1090
1091         if ( !ret ) {
1092                 ret = ch_malloc( bdb->bi_search_stack_depth * BDB_IDL_UM_SIZE
1093                         * sizeof( ID ) );
1094                 if ( op->o_threadctx ) {
1095                         ldap_pvt_thread_pool_setkey( op->o_threadctx, search_stack,
1096                                 ret, search_stack_free );
1097                 } else {
1098                         bdb->bi_search_stack = ret;
1099                 }
1100         }
1101         return ret;
1102 }
1103
1104 static int search_candidates(
1105         Operation *op,
1106         SlapReply *rs,
1107         Entry *e,
1108         u_int32_t locker,
1109         ID      *ids,
1110         ID      *scopes )
1111 {
1112         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
1113         int rc, depth = 1;
1114         Filter          f, rf, xf, nf;
1115         ID              *stack;
1116 #ifdef LDAP_COMP_MATCH
1117         AttributeAssertion aa_ref = { NULL, BER_BVNULL, NULL };
1118 #else
1119         AttributeAssertion aa_ref = { NULL, BER_BVNULL };
1120 #endif
1121         Filter  sf;
1122 #ifdef LDAP_COMP_MATCH
1123         AttributeAssertion aa_subentry = { NULL, BER_BVNULL, NULL };
1124 #else
1125         AttributeAssertion aa_subentry = { NULL, BER_BVNULL };
1126 #endif
1127
1128         /*
1129          * This routine takes as input a filter (user-filter)
1130          * and rewrites it as follows:
1131          *      (&(scope=DN)[(objectClass=subentry)]
1132          *              (|[(objectClass=referral)(objectClass=alias)](user-filter))
1133          */
1134
1135         Debug(LDAP_DEBUG_TRACE,
1136                 "search_candidates: base=\"%s\" (0x%08lx) scope=%d\n",
1137                 e->e_nname.bv_val, (long) e->e_id, op->oq_search.rs_scope );
1138
1139         xf.f_or = op->oq_search.rs_filter;
1140         xf.f_choice = LDAP_FILTER_OR;
1141         xf.f_next = NULL;
1142
1143         /* If the user's filter uses objectClass=*,
1144          * these clauses are redundant.
1145          */
1146         if (!oc_filter(op->oq_search.rs_filter, 1, &depth)
1147                 && !get_subentries_visibility(op)) {
1148                 if( !get_manageDSAit(op) && !get_domainScope(op) ) {
1149                         /* match referral objects */
1150                         struct berval bv_ref = BER_BVC( "referral" );
1151                         rf.f_choice = LDAP_FILTER_EQUALITY;
1152                         rf.f_ava = &aa_ref;
1153                         rf.f_av_desc = slap_schema.si_ad_objectClass;
1154                         rf.f_av_value = bv_ref;
1155                         rf.f_next = xf.f_or;
1156                         xf.f_or = &rf;
1157                         depth++;
1158                 }
1159         }
1160
1161         f.f_next = NULL;
1162         f.f_choice = LDAP_FILTER_AND;
1163         f.f_and = &nf;
1164         /* Dummy; we compute scope separately now */
1165         nf.f_choice = SLAPD_FILTER_COMPUTED;
1166         nf.f_result = LDAP_SUCCESS;
1167         nf.f_next = ( xf.f_or == op->oq_search.rs_filter )
1168                 ? op->oq_search.rs_filter : &xf ;
1169         /* Filter depth increased again, adding dummy clause */
1170         depth++;
1171
1172         if( get_subentries_visibility( op ) ) {
1173                 struct berval bv_subentry = BER_BVC( "subentry" );
1174                 sf.f_choice = LDAP_FILTER_EQUALITY;
1175                 sf.f_ava = &aa_subentry;
1176                 sf.f_av_desc = slap_schema.si_ad_objectClass;
1177                 sf.f_av_value = bv_subentry;
1178                 sf.f_next = nf.f_next;
1179                 nf.f_next = &sf;
1180         }
1181
1182         /* Allocate IDL stack, plus 1 more for former tmp */
1183         if ( depth+1 > bdb->bi_search_stack_depth ) {
1184                 stack = ch_malloc( (depth + 1) * BDB_IDL_UM_SIZE * sizeof( ID ) );
1185         } else {
1186                 stack = search_stack( op );
1187         }
1188
1189         if( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1190                 rc = search_aliases( op, rs, e, locker, ids, scopes, stack );
1191         } else {
1192                 rc = bdb_dn2idl( op, e, ids, stack );
1193         }
1194
1195         if ( rc == LDAP_SUCCESS ) {
1196                 rc = bdb_filter_candidates( op, &f, ids,
1197                         stack, stack+BDB_IDL_UM_SIZE );
1198         }
1199
1200         if ( depth+1 > bdb->bi_search_stack_depth ) {
1201                 ch_free( stack );
1202         }
1203
1204         if( rc ) {
1205                 Debug(LDAP_DEBUG_TRACE,
1206                         "bdb_search_candidates: failed (rc=%d)\n",
1207                         rc, NULL, NULL );
1208
1209         } else {
1210                 Debug(LDAP_DEBUG_TRACE,
1211                         "bdb_search_candidates: id=%ld first=%ld last=%ld\n",
1212                         (long) ids[0],
1213                         (long) BDB_IDL_FIRST(ids),
1214                         (long) BDB_IDL_LAST(ids) );
1215         }
1216
1217         return rc;
1218 }
1219
1220 static int
1221 parse_paged_cookie( Operation *op, SlapReply *rs )
1222 {
1223         LDAPControl     **c;
1224         int             rc = LDAP_SUCCESS;
1225         ber_tag_t       tag;
1226         ber_int_t       size;
1227         BerElement      *ber;
1228         struct berval   cookie = BER_BVNULL;
1229         PagedResultsState *ps = op->o_pagedresults_state;
1230
1231         /* this function must be invoked only if the pagedResults
1232          * control has been detected, parsed and partially checked
1233          * by the frontend */
1234         assert( get_pagedresults( op ) > SLAP_CONTROL_IGNORED );
1235
1236         /* look for the appropriate ctrl structure */
1237         for ( c = op->o_ctrls; c[0] != NULL; c++ ) {
1238                 if ( strcmp( c[0]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS ) == 0 )
1239                 {
1240                         break;
1241                 }
1242         }
1243
1244         if ( c[0] == NULL ) {
1245                 rs->sr_text = "missing pagedResults control";
1246                 return LDAP_PROTOCOL_ERROR;
1247         }
1248
1249         /* Tested by frontend */
1250         assert( c[0]->ldctl_value.bv_len > 0 );
1251
1252         /* Parse the control value
1253          *      realSearchControlValue ::= SEQUENCE {
1254          *              size    INTEGER (0..maxInt),
1255          *                              -- requested page size from client
1256          *                              -- result set size estimate from server
1257          *              cookie  OCTET STRING
1258          * }
1259          */
1260         ber = ber_init( &c[0]->ldctl_value );
1261         if ( ber == NULL ) {
1262                 rs->sr_text = "internal error";
1263                 return LDAP_OTHER;
1264         }
1265
1266         tag = ber_scanf( ber, "{im}", &size, &cookie );
1267
1268         /* Tested by frontend */
1269         assert( tag != LBER_ERROR );
1270         assert( size >= 0 );
1271
1272         /* cookie decoding/checks deferred to backend... */
1273         if ( cookie.bv_len ) {
1274                 PagedResultsCookie reqcookie;
1275                 if( cookie.bv_len != sizeof( reqcookie ) ) {
1276                         /* bad cookie */
1277                         rs->sr_text = "paged results cookie is invalid";
1278                         rc = LDAP_PROTOCOL_ERROR;
1279                         goto done;
1280                 }
1281
1282                 AC_MEMCPY( &reqcookie, cookie.bv_val, sizeof( reqcookie ));
1283
1284                 if ( reqcookie > ps->ps_cookie ) {
1285                         /* bad cookie */
1286                         rs->sr_text = "paged results cookie is invalid";
1287                         rc = LDAP_PROTOCOL_ERROR;
1288                         goto done;
1289
1290                 } else if ( reqcookie < ps->ps_cookie ) {
1291                         rs->sr_text = "paged results cookie is invalid or old";
1292                         rc = LDAP_UNWILLING_TO_PERFORM;
1293                         goto done;
1294                 }
1295
1296         }
1297
1298 done:;
1299         (void)ber_free( ber, 1 );
1300
1301         return rc;
1302 }
1303
1304 static void
1305 send_paged_response(
1306         Operation       *op,
1307         SlapReply       *rs,
1308         ID              *lastid,
1309         int             tentries )
1310 {
1311         LDAPControl     ctrl, *ctrls[2];
1312         BerElementBuffer berbuf;
1313         BerElement      *ber = (BerElement *)&berbuf;
1314         PagedResultsCookie respcookie;
1315         struct berval cookie;
1316
1317         Debug(LDAP_DEBUG_ARGS,
1318                 "send_paged_response: lastid=0x%08lx nentries=%d\n",
1319                 lastid ? *lastid : 0, rs->sr_nentries, NULL );
1320
1321         BER_BVZERO( &ctrl.ldctl_value );
1322         ctrls[0] = &ctrl;
1323         ctrls[1] = NULL;
1324
1325         ber_init2( ber, NULL, LBER_USE_DER );
1326
1327         if ( lastid ) {
1328                 respcookie = ( PagedResultsCookie )(*lastid);
1329                 cookie.bv_len = sizeof( respcookie );
1330                 cookie.bv_val = (char *)&respcookie;
1331
1332         } else {
1333                 respcookie = ( PagedResultsCookie )0;
1334                 BER_BVSTR( &cookie, "" );
1335         }
1336
1337         op->o_conn->c_pagedresults_state.ps_cookie = respcookie;
1338         op->o_conn->c_pagedresults_state.ps_count =
1339                 ((PagedResultsState *)op->o_pagedresults_state)->ps_count +
1340                 rs->sr_nentries;
1341
1342         /* return size of 0 -- no estimate */
1343         ber_printf( ber, "{iO}", 0, &cookie );
1344
1345         if ( ber_flatten2( ber, &ctrls[0]->ldctl_value, 0 ) == -1 ) {
1346                 goto done;
1347         }
1348
1349         ctrls[0]->ldctl_oid = LDAP_CONTROL_PAGEDRESULTS;
1350         ctrls[0]->ldctl_iscritical = 0;
1351
1352         rs->sr_ctrls = ctrls;
1353         rs->sr_err = LDAP_SUCCESS;
1354         send_ldap_result( op, rs );
1355         rs->sr_ctrls = NULL;
1356
1357 done:
1358         (void) ber_free_buf( ber );
1359 }
1360