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 2000-2004 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 *stackop,     /* op with the current threadctx/slab cache */
  32         Operation *sop,         /* search op */
  33         SlapReply *rs,
  34         Entry *e,
  35         u_int32_t locker,
  36         ID      *ids,
  37         ID      *scopes );
  38
  39 static int parse_paged_cookie( Operation *op, SlapReply *rs );
  40
  41 static void send_paged_response(
  42         Operation *op,
  43         SlapReply *rs,
  44         ID  *lastid,
  45         int tentries );
  46
  47 static int bdb_pfid_cmp( const void *v_id1, const void *v_id2 );
  48 static ID* bdb_id_dup( Operation *op, ID *id );
  49
  50 /* Dereference aliases for a single alias entry. Return the final
  51  * dereferenced entry on success, NULL on any failure.
  52  */
  53 static Entry * deref_base (
  54         Operation *op,
  55         SlapReply *rs,
  56         Entry *e,
  57         Entry **matched,
  58         u_int32_t locker,
  59         DB_LOCK *lock,
  60         ID      *tmp,
  61         ID      *visited )
  62 {
  63         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
  64         struct berval ndn;
  65         EntryInfo *ei;
  66         DB_LOCK lockr;
  67
  68         rs->sr_err = LDAP_ALIAS_DEREF_PROBLEM;
  69         rs->sr_text = "maximum deref depth exceeded";
  70
  71         while (BDB_IDL_N(tmp) < op->o_bd->be_max_deref_depth) {
  72                 /* Remember the last entry we looked at, so we can
  73                  * report broken links
  74                  */
  75                 *matched = e;
  76
  77                 /* If this is part of a subtree or onelevel search,
  78                  * have we seen this ID before? If so, quit.
  79                  */
  80                 if ( visited && bdb_idl_insert( visited, e->e_id ) ) {
  81                         e = NULL;
  82                         break;
  83                 }
  84
  85                 /* If we've seen this ID during this deref iteration,
  86                  * we've hit a loop.
  87                  */
  88                 if ( bdb_idl_insert( tmp, e->e_id ) ) {
  89                         rs->sr_err = LDAP_ALIAS_PROBLEM;
  90                         rs->sr_text = "circular alias";
  91                         e = NULL;
  92                         break;
  93                 }
  94
  95                 /* If there was a problem getting the aliasedObjectName,
  96                  * get_alias_dn will have set the error status.
  97                  */
  98                 if ( get_alias_dn(e, &ndn, &rs->sr_err, &rs->sr_text) ) {
  99                         e = NULL;
 100                         break;
 101                 }
 102
 103                 rs->sr_err = bdb_dn2entry( op, NULL, &ndn, &ei,
 104                         0, locker, &lockr );
 105
 106                 if ( ei ) {
 107                         e = ei->bei_e;
 108                 } else {
 109                         e = NULL;
 110                 }
 111
 112                 if (!e) {
 113                         rs->sr_err = LDAP_ALIAS_PROBLEM;
 114                         rs->sr_text = "aliasedObject not found";
 115                         break;
 116                 }
 117
 118                 /* Free the previous entry, continue to work with the
 119                  * one we just retrieved.
 120                  */
 121                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache,
 122                         *matched, lock);
 123                 *lock = lockr;
 124
 125                 /* We found a regular entry. Return this to the caller. The
 126                  * entry is still locked for Read.
 127                  */
 128                 if (!is_entry_alias(e)) {
 129                         rs->sr_err = LDAP_SUCCESS;
 130                         rs->sr_text = NULL;
 131                         break;
 132                 }
 133         }
 134         return e;
 135 }
 136
 137 /* Look for and dereference all aliases within the search scope. Adds
 138  * the dereferenced entries to the "ids" list. Requires "stack" to be
 139  * able to hold 8 levels of DB_SIZE IDLs. Of course we're hardcoded to
 140  * require a minimum of 8 UM_SIZE IDLs so this is never a problem.
 141  */
 142 static int search_aliases(
 143         Operation *op,
 144         SlapReply *rs,
 145         Entry *e,
 146         u_int32_t locker,
 147         ID *ids,
 148         ID *scopes,
 149         ID *stack )
 150 {
 151         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 152         ID *aliases, *curscop, *subscop, *visited, *newsubs, *oldsubs, *tmp;
 153         ID cursora, ida, cursoro, ido, *subscop2;
 154         Entry *matched, *a;
 155         EntryInfo *ei;
 156         struct berval bv_alias = BER_BVC( "alias" );
 157         AttributeAssertion aa_alias;
 158         Filter  af;
 159         DB_LOCK locka, lockr;
 160         int first = 1;
 161
 162         aliases = stack;        /* IDL of all aliases in the database */
 163         curscop = aliases + BDB_IDL_DB_SIZE;    /* Aliases in the current scope */
 164         subscop = curscop + BDB_IDL_DB_SIZE;    /* The current scope */
 165         visited = subscop + BDB_IDL_DB_SIZE;    /* IDs we've seen in this search */
 166         newsubs = visited + BDB_IDL_DB_SIZE;    /* New subtrees we've added */
 167         oldsubs = newsubs + BDB_IDL_DB_SIZE;    /* Subtrees added previously */
 168         tmp = oldsubs + BDB_IDL_DB_SIZE;        /* Scratch space for deref_base() */
 169
 170         /* A copy of subscop, because subscop gets clobbered by
 171          * the bdb_idl_union/intersection routines
 172          */
 173         subscop2 = tmp + BDB_IDL_DB_SIZE;
 174
 175         af.f_choice = LDAP_FILTER_EQUALITY;
 176         af.f_ava = &aa_alias;
 177         af.f_av_desc = slap_schema.si_ad_objectClass;
 178         af.f_av_value = bv_alias;
 179         af.f_next = NULL;
 180
 181         /* Find all aliases in database */
 182         BDB_IDL_ZERO( aliases );
 183         rs->sr_err = bdb_filter_candidates( op, &af, aliases,
 184                 curscop, visited );
 185         if (rs->sr_err != LDAP_SUCCESS) {
 186                 return rs->sr_err;
 187         }
 188         oldsubs[0] = 1;
 189         oldsubs[1] = e->e_id;
 190
 191         BDB_IDL_ZERO( ids );
 192         BDB_IDL_ZERO( visited );
 193         BDB_IDL_ZERO( newsubs );
 194
 195         cursoro = 0;
 196         ido = bdb_idl_first( oldsubs, &cursoro );
 197
 198         for (;;) {
 199                 /* Set curscop to only the aliases in the current scope. Start with
 200                  * all the aliases, obtain the IDL for the current scope, and then
 201                  * get the intersection of these two IDLs. Add the current scope
 202                  * to the cumulative list of candidates.
 203                  */
 204                 BDB_IDL_CPY( curscop, aliases );
 205                 rs->sr_err = bdb_dn2idl( op, e, subscop,
 206                         subscop2+BDB_IDL_DB_SIZE );
 207                 if (first) {
 208                         first = 0;
 209                 } else {
 210                         bdb_cache_return_entry_r (bdb->bi_dbenv, &bdb->bi_cache, e, &locka);
 211                 }
 212                 BDB_IDL_CPY(subscop2, subscop);
 213                 rs->sr_err = bdb_idl_intersection(curscop, subscop);
 214                 bdb_idl_union( ids, subscop2 );
 215
 216                 /* Dereference all of the aliases in the current scope. */
 217                 cursora = 0;
 218                 for (ida = bdb_idl_first(curscop, &cursora); ida != NOID;
 219                         ida = bdb_idl_next(curscop, &cursora))
 220                 {
 221                         ei = NULL;
 222 retry1:
 223                         rs->sr_err = bdb_cache_find_id(op, NULL,
 224                                 ida, &ei, 0, locker, &lockr );
 225                         if (rs->sr_err != LDAP_SUCCESS) {
 226                                 if ( rs->sr_err == DB_LOCK_DEADLOCK ||
 227                                         rs->sr_err == DB_LOCK_NOTGRANTED ) goto retry1;
 228                                 continue;
 229                         }
 230                         a = ei->bei_e;
 231
 232                         /* This should only happen if the curscop IDL has maxed out and
 233                          * turned into a range that spans IDs indiscriminately
 234                          */
 235                         if (!is_entry_alias(a)) {
 236                                 bdb_cache_return_entry_r (bdb->bi_dbenv, &bdb->bi_cache,
 237                                         a, &lockr);
 238                                 continue;
 239                         }
 240
 241                         /* Actually dereference the alias */
 242                         BDB_IDL_ZERO(tmp);
 243                         a = deref_base( op, rs, a, &matched, locker, &lockr,
 244                                 tmp, visited );
 245                         if (a) {
 246                                 /* If the target was not already in our current candidates,
 247                                  * make note of it in the newsubs list. Also
 248                                  * set it in the scopes list so that bdb_search
 249                                  * can check it.
 250                                  */
 251                                 if (bdb_idl_insert(ids, a->e_id) == 0) {
 252                                         bdb_idl_insert(newsubs, a->e_id);
 253                                         bdb_idl_insert(scopes, a->e_id);
 254                                 }
 255                                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache,
 256                                         a, &lockr);
 257
 258                         } else if (matched) {
 259                                 /* Alias could not be dereferenced, or it deref'd to
 260                                  * an ID we've already seen. Ignore it.
 261                                  */
 262                                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache,
 263                                         matched, &lockr );
 264                                 rs->sr_text = NULL;
 265                         }
 266                 }
 267                 /* If this is a OneLevel search, we're done; oldsubs only had one
 268                  * ID in it. For a Subtree search, oldsubs may be a list of scope IDs.
 269                  */
 270                 if ( op->ors_scope == LDAP_SCOPE_ONELEVEL ) break;
 271 nextido:
 272                 ido = bdb_idl_next( oldsubs, &cursoro );
 273
 274                 /* If we're done processing the old scopes, did we add any new
 275                  * scopes in this iteration? If so, go back and do those now.
 276                  */
 277                 if (ido == NOID) {
 278                         if (BDB_IDL_IS_ZERO(newsubs)) break;
 279                         BDB_IDL_CPY(oldsubs, newsubs);
 280                         BDB_IDL_ZERO(newsubs);
 281                         cursoro = 0;
 282                         ido = bdb_idl_first( oldsubs, &cursoro );
 283                 }
 284
 285                 /* Find the entry corresponding to the next scope. If it can't
 286                  * be found, ignore it and move on. This should never happen;
 287                  * we should never see the ID of an entry that doesn't exist.
 288                  * Set the name so that the scope's IDL can be retrieved.
 289                  */
 290                 ei = NULL;
 291 sameido:
 292                 rs->sr_err = bdb_cache_find_id(op, NULL, ido, &ei,
 293                         0, locker, &locka );
 294                 if ( rs->sr_err != LDAP_SUCCESS ) {
 295                         if ( rs->sr_err == DB_LOCK_DEADLOCK ||
 296                                 rs->sr_err == DB_LOCK_NOTGRANTED )
 297                                 goto sameido;
 298                         goto nextido;
 299                 }
 300                 e = ei->bei_e;
 301         }
 302         return rs->sr_err;
 303 }
 304
 305 #ifdef BDB_PSEARCH
 306
 307 #define is_sync_protocol(op)    \
 308         ((op)->o_sync_mode & SLAP_SYNC_REFRESH_AND_PERSIST)
 309
 310 #define IS_BDB_REPLACE(type) (( type == LDAP_PSEARCH_BY_DELETE ) || \
 311         ( type == LDAP_PSEARCH_BY_SCOPEOUT ))
 312 #define IS_PSEARCH (op != sop)
 313 #define IS_POST_SEARCH ( op->ors_post_search_id != NOID )
 314
 315 static Operation *
 316 bdb_drop_psearch( Operation *op, ber_int_t msgid )
 317 {
 318         Operation       *ps_list;
 319         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 320
 321         LDAP_LIST_FOREACH ( ps_list, &bdb->bi_psearch_list, o_ps_link ) {
 322                 if ( ps_list->o_connid == op->o_connid ) {
 323                         if ( ps_list->o_msgid == msgid ) {
 324                                 ps_list->o_abandon = 1;
 325                                 LDAP_LIST_REMOVE( ps_list, o_ps_link );
 326                                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 327                                 LDAP_STAILQ_REMOVE( &op->o_conn->c_ops, ps_list,
 328                                         slap_op, o_next );
 329                                 LDAP_STAILQ_NEXT( ps_list, o_next ) = NULL;
 330                                 op->o_conn->c_n_ops_executing--;
 331                                 op->o_conn->c_n_ops_completed++;
 332                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 333                                 return ps_list;
 334                         }
 335                 }
 336         }
 337
 338         return NULL;
 339 }
 340
 341 int
 342 bdb_abandon( Operation *op, SlapReply *rs )
 343 {
 344         Operation       *ps;
 345         void            *saved_tmpmemctx;
 346
 347         ps = bdb_drop_psearch( op, op->oq_abandon.rs_msgid );
 348         if ( ps ) {
 349                 saved_tmpmemctx = ps->o_tmpmemctx;
 350
 351                 if (!BER_BVISNULL(&ps->o_req_dn)) {
 352                         slap_sl_free(ps->o_req_dn.bv_val, ps->o_tmpmemctx );
 353                 }
 354                 if (!BER_BVISNULL(&ps->o_req_ndn)) {
 355                         slap_sl_free(ps->o_req_ndn.bv_val, ps->o_tmpmemctx );
 356                 }
 357                 if (!BER_BVISNULL(&ps->ors_filterstr)) {
 358                         ps->o_tmpfree(ps->ors_filterstr.bv_val, ps->o_tmpmemctx);
 359                 }
 360                 if (ps->ors_filter != NULL) {
 361                         filter_free_x(ps, ps->ors_filter);
 362                 }
 363                 if (ps->ors_attrs != NULL) {
 364                         ps->o_tmpfree(ps->ors_attrs, ps->o_tmpmemctx);
 365                 }
 366
 367                 slap_op_free ( ps );
 368
 369                 if ( saved_tmpmemctx ) {
 370                         slap_sl_mem_destroy( NULL, saved_tmpmemctx );
 371                 }
 372
 373                 return LDAP_SUCCESS;
 374         }
 375         return LDAP_UNAVAILABLE;
 376 }
 377
 378 int
 379 bdb_cancel( Operation *op, SlapReply *rs )
 380 {
 381         Operation       *ps;
 382         void            *saved_tmpmemctx;
 383
 384         ps = bdb_drop_psearch( op, op->oq_cancel.rs_msgid );
 385         if ( ps ) {
 386                 saved_tmpmemctx = ps->o_tmpmemctx;
 387
 388                 rs->sr_err = LDAP_CANCELLED;
 389                 send_ldap_result( ps, rs );
 390
 391                 if (!BER_BVISNULL(&ps->o_req_dn)) {
 392                         slap_sl_free(ps->o_req_dn.bv_val, ps->o_tmpmemctx );
 393                 }
 394                 if (!BER_BVISNULL(&ps->o_req_ndn)) {
 395                         slap_sl_free(ps->o_req_ndn.bv_val, ps->o_tmpmemctx );
 396                 }
 397                 if (!BER_BVISNULL(&ps->ors_filterstr)) {
 398                         ps->o_tmpfree(ps->ors_filterstr.bv_val, ps->o_tmpmemctx);
 399                 }
 400                 if (ps->ors_filter != NULL) {
 401                         filter_free_x(ps, ps->ors_filter);
 402                 }
 403                 if (ps->ors_attrs != NULL) {
 404                         ps->o_tmpfree(ps->ors_attrs, ps->o_tmpmemctx);
 405                 }
 406
 407                 slap_op_free ( ps );
 408
 409                 if ( saved_tmpmemctx ) {
 410                         slap_sl_mem_destroy( NULL, saved_tmpmemctx );
 411                 }
 412
 413                 return LDAP_SUCCESS;
 414         }
 415         return LDAP_UNAVAILABLE;
 416 }
 417
 418 int bdb_search( Operation *op, SlapReply *rs )
 419 {
 420         int rc;
 421         struct pc_entry *pce = NULL;
 422         struct pc_entry *tmp_pce = NULL;
 423         Entry ps_e = {0};
 424         Attribute *a;
 425
 426         ps_e.e_private = NULL;
 427         ldap_pvt_thread_mutex_init( &op->o_pcmutex );
 428         LDAP_TAILQ_INIT( &op->o_ps_pre_candidates );
 429         LDAP_TAILQ_INIT( &op->o_ps_post_candidates );
 430
 431         op->ors_post_search_id = NOID;
 432         rc = bdb_do_search( op, rs, op, NULL, 0 );
 433
 434         ldap_pvt_thread_mutex_lock( &op->o_pcmutex );
 435         pce = LDAP_TAILQ_FIRST( &op->o_ps_post_candidates );
 436         ldap_pvt_thread_mutex_unlock( &op->o_pcmutex );
 437
 438         while ( rc == LDAP_SUCCESS && pce &&
 439                         op->o_sync_mode & SLAP_SYNC_REFRESH_AND_PERSIST ) {
 440
 441                 ps_e.e_id = op->ors_post_search_id = pce->pc_id;
 442                 if ( op->o_sync_csn.bv_val ) {
 443                         ch_free( op->o_sync_csn.bv_val );
 444                         op->o_sync_csn.bv_val = NULL;
 445                 }
 446                 ber_dupbv( &op->o_sync_csn, &pce->pc_csn );
 447                 ber_dupbv( &ps_e.e_name, &pce->pc_ename );
 448                 ber_dupbv( &ps_e.e_nname, &pce->pc_enname );
 449                 a = ch_calloc( 1, sizeof( Attribute ));
 450                 a->a_desc = slap_schema.si_ad_entryUUID;
 451                 a->a_vals = ch_calloc( 2, sizeof( struct berval ));
 452                 ber_dupbv( &a->a_vals[0], &pce->pc_entryUUID );
 453                 a->a_nvals = a->a_vals;
 454                 a->a_next = NULL;
 455                 ps_e.e_attrs = a;
 456
 457                 rc = bdb_do_search( op, rs, op, &ps_e, 0 );
 458
 459                 tmp_pce = pce;
 460                 ldap_pvt_thread_mutex_lock( &op->o_pcmutex );
 461                 pce = LDAP_TAILQ_NEXT( pce, pc_link );
 462                 LDAP_TAILQ_REMOVE( &op->o_ps_post_candidates, tmp_pce, pc_link );
 463                 ldap_pvt_thread_mutex_unlock( &op->o_pcmutex );
 464
 465                 ch_free( tmp_pce->pc_csn.bv_val );
 466                 ch_free( tmp_pce->pc_entryUUID.bv_val );
 467                 ch_free( tmp_pce->pc_ename.bv_val );
 468                 ch_free( tmp_pce->pc_enname.bv_val );
 469                 ch_free( tmp_pce );
 470                 entry_clean( &ps_e );
 471         }
 472         return rc;
 473 }
 474
 475 #define BDB_PSEARCH_MAX_WAIT 3
 476 int bdb_psearch( Operation *op, SlapReply *rs, Operation *sop,
 477         Entry *ps_e, int ps_type )
 478 {
 479         int     rc;
 480         struct pc_entry *pce = NULL;
 481         struct pc_entry *p = NULL;
 482         int num_retries = 0;
 483
 484         op->ors_post_search_id = NOID;
 485
 486         switch (ps_type) {
 487         case LDAP_PSEARCH_BY_PREMODIFY:
 488         case LDAP_PSEARCH_BY_PREDELETE:
 489
 490                 if ( !op->o_ps_send_wait ) {
 491                         if ( sop->o_refresh_in_progress ) {
 492                                 pce = (struct pc_entry *) ch_calloc(
 493                                                         1, sizeof( struct pc_entry ));
 494                                 pce->pc_id = ps_e->e_id;
 495                                 ldap_pvt_thread_mutex_lock( &sop->o_pcmutex );
 496                                 if ( LDAP_TAILQ_EMPTY( &sop->o_ps_pre_candidates )) {
 497                                         LDAP_TAILQ_INSERT_HEAD(
 498                                                         &sop->o_ps_pre_candidates, pce, pc_link );
 499                                 } else {
 500                                         LDAP_TAILQ_FOREACH( p,
 501                                                         &sop->o_ps_pre_candidates, pc_link ) {
 502                                                 if ( p->pc_id > pce->pc_id )
 503                                                         break;
 504                                         }
 505
 506                                         if ( p ) {
 507                                                 LDAP_TAILQ_INSERT_BEFORE( p, pce, pc_link );
 508                                         } else {
 509                                                 LDAP_TAILQ_INSERT_TAIL(
 510                                                                 &sop->o_ps_pre_candidates,
 511                                                                 pce, pc_link );
 512                                         }
 513                                 }
 514                                 ldap_pvt_thread_mutex_unlock( &sop->o_pcmutex );
 515                         } else {
 516                                 rc = bdb_do_search( op, rs, sop, ps_e, ps_type );
 517                                 return rc;
 518                         }
 519                 } else {
 520                         pce = op->o_ps_send_wait;
 521                 }
 522
 523                 /* Wait until refresh search send the entry */
 524                 while ( !pce->pc_sent ) {
 525                         if ( sop->o_refresh_in_progress ) {
 526                                 if ( num_retries == BDB_PSEARCH_MAX_WAIT ) {
 527                                         op->o_ps_send_wait = pce;
 528                                         return LDAP_BUSY;
 529                                 }
 530                                 ldap_pvt_thread_yield();
 531                                 bdb_trans_backoff( ++num_retries );
 532                         } else {
 533                                 break;
 534                         }
 535                 }
 536
 537                 op->o_ps_send_wait = NULL;
 538
 539                 if ( !sop->o_refresh_in_progress && !pce->pc_sent ) {
 540                         /* refresh ended without processing pce */
 541                         /* need to perform psearch for ps_e */
 542                         ldap_pvt_thread_mutex_lock( &sop->o_pcmutex );
 543                         LDAP_TAILQ_REMOVE( &sop->o_ps_pre_candidates, pce, pc_link );
 544                         ldap_pvt_thread_mutex_unlock( &sop->o_pcmutex );
 545                         ch_free( pce );
 546                         rc = bdb_do_search( op, rs, sop, ps_e, ps_type );
 547                         return rc;
 548                 } else {
 549                         /* the pce entry was sent in the refresh phase */
 550                         if ( ps_type == LDAP_PSEARCH_BY_PREMODIFY ) {
 551                                 struct psid_entry* psid_e;
 552                                 psid_e = (struct psid_entry *) ch_calloc(1,
 553                                                         sizeof(struct psid_entry));
 554                                 psid_e->ps_op = sop;
 555                                 LDAP_LIST_INSERT_HEAD( &op->o_pm_list, psid_e, ps_link );
 556                         }
 557
 558                         ldap_pvt_thread_mutex_lock( &sop->o_pcmutex );
 559                         LDAP_TAILQ_REMOVE( &sop->o_ps_pre_candidates, pce, pc_link );
 560                         ldap_pvt_thread_mutex_unlock( &sop->o_pcmutex );
 561                         ch_free( pce );
 562                         return LDAP_SUCCESS;
 563                 }
 564                 break;
 565         case LDAP_PSEARCH_BY_DELETE:
 566         case LDAP_PSEARCH_BY_SCOPEOUT:
 567         case LDAP_PSEARCH_BY_ADD:
 568         case LDAP_PSEARCH_BY_MODIFY:
 569                 ldap_pvt_thread_mutex_lock( &op->o_pcmutex );
 570                 if ( sop->o_refresh_in_progress ||
 571                                 !LDAP_TAILQ_EMPTY( &sop->o_ps_post_candidates )) {
 572                         pce = (struct pc_entry *) ch_calloc( 1, sizeof( struct pc_entry ));
 573                         pce->pc_id = ps_e->e_id;
 574                         ber_dupbv( &pce->pc_csn, &op->o_sync_csn );
 575                         if ( ps_type == LDAP_PSEARCH_BY_DELETE ) {
 576                                 Attribute *a;
 577                                 for ( a = ps_e->e_attrs; a != NULL; a = a->a_next ) {
 578                                         AttributeDescription *desc = a->a_desc;
 579                                         if ( desc == slap_schema.si_ad_entryUUID ) {
 580                                                 ber_dupbv( &pce->pc_entryUUID, &a->a_nvals[0] );
 581                                         }
 582                                 }
 583                         }
 584                         ber_dupbv( &pce->pc_ename, &ps_e->e_name );
 585                         ber_dupbv( &pce->pc_enname, &ps_e->e_nname );
 586                         LDAP_TAILQ_INSERT_TAIL( &sop->o_ps_post_candidates, pce, pc_link );
 587                         ldap_pvt_thread_mutex_unlock( &op->o_pcmutex );
 588                 } else {
 589                         ldap_pvt_thread_mutex_unlock( &op->o_pcmutex );
 590                         rc = bdb_do_search( op, rs, sop, ps_e, ps_type );
 591                         return rc;
 592                 }
 593                 break;
 594         default:
 595                 Debug( LDAP_DEBUG_TRACE, "do_psearch: invalid psearch type\n",
 596                                 0, 0, 0 );
 597                 return LDAP_OTHER;
 598         }
 599 }
 600 #else
 601 int bdb_search( Operation *op, SlapReply *rs )
 602 {
 603         return bdb_do_search( op, rs, op, NULL, 0 );
 604 }
 605 #endif
 606
 607 /* For persistent searches, op is the currently executing operation,
 608  * sop is the persistent search. For regular searches, sop = op.
 609  */
 610 int
 611 bdb_do_search( Operation *op, SlapReply *rs, Operation *sop,
 612         Entry *ps_e, int ps_type )
 613 {
 614         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 615         time_t          stoptime;
 616         ID              id, cursor;
 617         ID              candidates[BDB_IDL_UM_SIZE];
 618         ID              scopes[BDB_IDL_DB_SIZE];
 619         Entry           *e = NULL, base, e_root = {0};
 620         Entry           *matched = NULL;
 621         EntryInfo       *ei, ei_root = {0};
 622         struct berval   realbase = BER_BVNULL;
 623         int             manageDSAit;
 624         int             tentries = 0;
 625         ID              lastid = NOID;
 626         AttributeName   *attrs;
 627
 628         u_int32_t       locker = 0;
 629         DB_LOCK         lock;
 630         struct  bdb_op_info     *opinfo = NULL;
 631         DB_TXN                  *ltid = NULL;
 632
 633 #ifdef BDB_PSEARCH
 634         Filter          contextcsnand, contextcsnle, cookief, csnfnot,
 635                         csnfeq, csnfand, csnfge;
 636         AttributeAssertion aa_ge, aa_eq, aa_le;
 637         struct berval   *search_context_csn = NULL;
 638         DB_LOCK         ctxcsn_lock;
 639         LDAPControl     *ctrls[SLAP_MAX_RESPONSE_CONTROLS];
 640         int             num_ctrls = 0;
 641         AttributeName   uuid_attr[2];
 642         int             rc_sync = 0;
 643         int             entry_sync_state = -1;
 644         AttributeName   null_attr;
 645         int             no_sync_state_change = 0;
 646
 647
 648         Operation       *ps_list;
 649         int                     sync_send_present_mode = 1;
 650         int                     match;
 651         MatchingRule *mr;
 652         const char *text;
 653         int                     slog_found = 0;
 654
 655         struct pc_entry *pce = NULL;
 656         BerVarray       syncUUID_set = NULL;
 657         int                     syncUUID_set_cnt = 0;
 658
 659 #endif
 660
 661         Debug( LDAP_DEBUG_TRACE, "=> " LDAP_XSTRING(bdb_search) "\n", 0, 0, 0);
 662         attrs = sop->oq_search.rs_attrs;
 663
 664         opinfo = (struct bdb_op_info *) op->o_private;
 665
 666 #ifdef BDB_PSEARCH
 667         if ( !IS_POST_SEARCH && !IS_PSEARCH &&
 668                         sop->o_sync_mode & SLAP_SYNC_REFRESH_AND_PERSIST ) {
 669                 struct slap_session_entry *sent;
 670                 if ( sop->o_sync_state.sid >= 0 ) {
 671                         LDAP_LIST_FOREACH( sent, &bdb->bi_session_list, se_link ) {
 672                                 if ( sent->se_id == sop->o_sync_state.sid ) {
 673                                         sop->o_sync_slog_size = sent->se_size;
 674                                         break;
 675                                 }
 676                         }
 677                 }
 678         }
 679
 680         /* psearch needs to be registered before refresh begins */
 681         if ( !IS_POST_SEARCH && !IS_PSEARCH &&
 682                         sop->o_sync_mode & SLAP_SYNC_PERSIST ) {
 683                 sop->o_refresh_in_progress = 1;
 684                 ldap_pvt_thread_rdwr_wlock( &bdb->bi_pslist_rwlock );
 685                 LDAP_LIST_INSERT_HEAD( &bdb->bi_psearch_list, sop, o_ps_link );
 686                 ldap_pvt_thread_rdwr_wunlock( &bdb->bi_pslist_rwlock );
 687
 688         } else if ( !IS_POST_SEARCH && !IS_PSEARCH &&
 689                                 sop->o_sync_mode & SLAP_SYNC_REFRESH_AND_PERSIST
 690                                 && sop->o_sync_slog_size >= 0 )
 691         {
 692                 ldap_pvt_thread_rdwr_wlock( &bdb->bi_pslist_rwlock );
 693                 LDAP_LIST_FOREACH( ps_list, &bdb->bi_psearch_list, o_ps_link ) {
 694                         if ( ps_list->o_sync_slog_size >= 0 ) {
 695                                 if ( ps_list->o_sync_state.sid == sop->o_sync_state.sid ) {
 696                                         slog_found = 1;
 697                                         break;
 698                                 }
 699                         }
 700                 }
 701
 702                 if ( slog_found ) {
 703                         if ( ps_list->o_sync_slog_omitcsn.bv_len != 0 ) {
 704                                 mr = slap_schema.si_ad_entryCSN->ad_type->sat_ordering;
 705                                 if ( sop->o_sync_state.ctxcsn &&
 706                                         sop->o_sync_state.ctxcsn->bv_val != NULL )
 707                                 {
 708                                         value_match( &match, slap_schema.si_ad_entryCSN, mr,
 709                                                 SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 710                                                 sop->o_sync_state.ctxcsn,
 711                                                 &ps_list->o_sync_slog_omitcsn,
 712                                                 &text );
 713                                 } else {
 714                                         match = -1;
 715                                 }
 716                                 if ( match >= 0 ) {
 717                                         sync_send_present_mode = 0;
 718                                 }
 719                         } else {
 720                                 sync_send_present_mode = 0;
 721                         }
 722                 } else if ( sop->o_sync_slog_size >= 0 ) {
 723                         LDAP_LIST_INSERT_HEAD( &bdb->bi_psearch_list, sop, o_ps_link );
 724                 } else {
 725                         sop->o_sync_state.sid = -1;
 726                 }
 727                 ldap_pvt_thread_rdwr_wunlock( &bdb->bi_pslist_rwlock );
 728         }
 729
 730         null_attr.an_desc = NULL;
 731         null_attr.an_oc = NULL;
 732         null_attr.an_oc_exclude = 0;
 733         BER_BVZERO( &null_attr.an_name );
 734
 735         for( num_ctrls = 0; num_ctrls < SLAP_MAX_RESPONSE_CONTROLS; num_ctrls++ ) {
 736                 ctrls[num_ctrls] = NULL;
 737         }
 738         num_ctrls = 0;
 739
 740         if ( IS_PSEARCH && IS_BDB_REPLACE(ps_type)) {
 741                 attrs = uuid_attr;
 742                 attrs[0].an_desc = NULL;
 743                 attrs[0].an_oc = NULL;
 744                 attrs[0].an_oc_exclude = 0;
 745                 BER_BVZERO( &attrs[0].an_name );
 746         }
 747 #endif
 748
 749         manageDSAit = get_manageDSAit( sop );
 750
 751 #ifdef BDB_PSEARCH
 752         /* Sync control overrides manageDSAit */
 753         if ( !IS_PSEARCH && sop->o_sync_mode & SLAP_SYNC_REFRESH ) {
 754                 if ( manageDSAit == SLAP_CONTROL_NONE ) {
 755                         manageDSAit = SLAP_CONTROL_CRITICAL;
 756                 }
 757         } else if ( IS_PSEARCH ) {
 758                 if ( manageDSAit == SLAP_CONTROL_NONE ) {
 759                         manageDSAit = SLAP_CONTROL_CRITICAL;
 760                 }
 761         }
 762 #endif
 763
 764         if ( opinfo && opinfo->boi_txn ) {
 765                 ltid = opinfo->boi_txn;
 766                 locker = TXN_ID( ltid );
 767         } else {
 768                 rs->sr_err = LOCK_ID( bdb->bi_dbenv, &locker );
 769
 770                 switch(rs->sr_err) {
 771                 case 0:
 772                         break;
 773                 default:
 774                         send_ldap_error( sop, rs, LDAP_OTHER, "internal error" );
 775                         return rs->sr_err;
 776                 }
 777         }
 778
 779 #ifdef BDB_PSEARCH
 780         if ( IS_POST_SEARCH ) {
 781                 cursor = 0;
 782                 candidates[0] = 1;
 783                 candidates[1] = op->ors_post_search_id;
 784                 search_context_csn = ber_dupbv( NULL, &op->o_sync_csn );
 785                 goto loop_start;
 786         }
 787 #endif
 788
 789         if ( sop->o_req_ndn.bv_len == 0 ) {
 790                 /* DIT root special case */
 791                 ei_root.bei_e = &e_root;
 792                 ei_root.bei_parent = &ei_root;
 793                 e_root.e_private = &ei_root;
 794                 e_root.e_id = 0;
 795                 BER_BVSTR( &e_root.e_nname, "" );
 796                 BER_BVSTR( &e_root.e_name, "" );
 797                 ei = &ei_root;
 798                 rs->sr_err = LDAP_SUCCESS;
 799         } else {
 800 dn2entry_retry:
 801                 /* get entry with reader lock */
 802                 rs->sr_err = bdb_dn2entry( op, ltid, &sop->o_req_ndn, &ei,
 803                         1, locker, &lock );
 804         }
 805
 806         switch(rs->sr_err) {
 807         case DB_NOTFOUND:
 808                 matched = ei->bei_e;
 809                 break;
 810         case 0:
 811                 e = ei->bei_e;
 812                 break;
 813         case LDAP_BUSY:
 814                 send_ldap_error( sop, rs, LDAP_BUSY, "ldap server busy" );
 815                 if ( !opinfo )
 816                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 817                 return LDAP_BUSY;
 818         case DB_LOCK_DEADLOCK:
 819         case DB_LOCK_NOTGRANTED:
 820                 goto dn2entry_retry;
 821         default:
 822                 send_ldap_error( sop, rs, LDAP_OTHER, "internal error" );
 823                 if ( !opinfo )
 824                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 825                 return rs->sr_err;
 826         }
 827
 828         if ( e && (op->ors_deref & LDAP_DEREF_FINDING) && is_entry_alias(e) ) {
 829                 BDB_IDL_ZERO(candidates);
 830                 e = deref_base( op, rs, e, &matched, locker, &lock,
 831                         candidates, NULL );
 832         }
 833
 834         if ( e == NULL ) {
 835                 struct berval matched_dn = BER_BVNULL;
 836
 837                 if ( matched != NULL ) {
 838                         BerVarray erefs;
 839                         ber_dupbv( &matched_dn, &matched->e_name );
 840
 841                         erefs = is_entry_referral( matched )
 842                                 ? get_entry_referrals( op, matched )
 843                                 : NULL;
 844
 845 #ifdef SLAP_ZONE_ALLOC
 846                         slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
 847 #endif
 848                         bdb_cache_return_entry_r (bdb->bi_dbenv, &bdb->bi_cache,
 849                                 matched, &lock);
 850                         matched = NULL;
 851
 852                         if( erefs ) {
 853                                 rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 854                                         &sop->o_req_dn, sop->oq_search.rs_scope );
 855                                 ber_bvarray_free( erefs );
 856                         }
 857
 858                 } else {
 859 #ifdef SLAP_ZONE_ALLOC
 860                         slap_zn_runlock(bdb->bi_cache.c_zctx, matched);
 861 #endif
 862                         rs->sr_ref = referral_rewrite( default_referral,
 863                                 NULL, &sop->o_req_dn, sop->oq_search.rs_scope );
 864                 }
 865
 866                 rs->sr_err = LDAP_REFERRAL;
 867                 rs->sr_matched = matched_dn.bv_val;
 868                 send_ldap_result( sop, rs );
 869
 870                 if ( !opinfo )
 871                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 872                 if ( rs->sr_ref ) {
 873                         ber_bvarray_free( rs->sr_ref );
 874                         rs->sr_ref = NULL;
 875                 }
 876                 if ( matched_dn.bv_val ) {
 877                         ber_memfree( matched_dn.bv_val );
 878                         rs->sr_matched = NULL;
 879                 }
 880                 return rs->sr_err;
 881         }
 882
 883         if ( !manageDSAit && e != &e_root && is_entry_referral( e ) ) {
 884                 /* entry is a referral, don't allow add */
 885                 struct berval matched_dn;
 886                 BerVarray erefs;
 887
 888                 ber_dupbv( &matched_dn, &e->e_name );
 889                 erefs = get_entry_referrals( op, e );
 890
 891 #ifdef SLAP_ZONE_ALLOC
 892                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 893 #endif
 894                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache, e, &lock );
 895                 e = NULL;
 896
 897                 if( erefs ) {
 898                         rs->sr_ref = referral_rewrite( erefs, &matched_dn,
 899                                 &sop->o_req_dn, sop->oq_search.rs_scope );
 900                         ber_bvarray_free( erefs );
 901                 }
 902
 903                 Debug( LDAP_DEBUG_TRACE,
 904                         LDAP_XSTRING(bdb_search) ": entry is referral\n",
 905                         0, 0, 0 );
 906
 907                 if (!rs->sr_ref) rs->sr_text = "bad_referral object";
 908                 rs->sr_err = LDAP_REFERRAL;
 909                 rs->sr_matched = matched_dn.bv_val;
 910                 send_ldap_result( sop, rs );
 911
 912                 if ( !opinfo )
 913                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 914                 ber_bvarray_free( rs->sr_ref );
 915                 rs->sr_ref = NULL;
 916                 ber_memfree( matched_dn.bv_val );
 917                 rs->sr_matched = NULL;
 918                 return 1;
 919         }
 920
 921         if ( get_assert( op ) &&
 922                 ( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
 923         {
 924                 rs->sr_err = LDAP_ASSERTION_FAILED;
 925 #ifdef SLAP_ZONE_ALLOC
 926                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 927 #endif
 928                 send_ldap_result( sop, rs );
 929                 return 1;
 930         }
 931
 932         /* compute it anyway; root does not use it */
 933         stoptime = op->o_time + sop->ors_tlimit;
 934
 935         /* need normalized dn below */
 936         ber_dupbv( &realbase, &e->e_nname );
 937
 938         /* Copy info to base, must free entry before accessing the database
 939          * in search_candidates, to avoid deadlocks.
 940          */
 941         base.e_private = e->e_private;
 942         base.e_nname = realbase;
 943         base.e_id = e->e_id;
 944
 945 #ifdef SLAP_ZONE_ALLOC
 946         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
 947 #endif
 948         if ( e != &e_root ) {
 949                 bdb_cache_return_entry_r(bdb->bi_dbenv, &bdb->bi_cache, e, &lock);
 950         }
 951         e = NULL;
 952
 953 #ifdef BDB_PSEARCH
 954         if ( !IS_PSEARCH ) {
 955                 rs->sr_err = bdb_get_commit_csn( sop, rs, &search_context_csn,
 956                         locker, &ctxcsn_lock );
 957
 958                 if ( rs->sr_err != LDAP_SUCCESS ) {
 959                         send_ldap_error( sop, rs, rs->sr_err,
 960                                 "error in csn management in search" );
 961                         goto done;
 962                 }
 963
 964                 if ( sop->o_sync_mode != SLAP_SYNC_NONE &&
 965                         sop->o_sync_state.ctxcsn &&
 966                         sop->o_sync_state.ctxcsn->bv_val &&
 967                         ber_bvcmp( &sop->o_sync_state.ctxcsn[0], search_context_csn ) == 0 )
 968                 {
 969                         bdb_cache_entry_db_unlock( bdb->bi_dbenv, &ctxcsn_lock );
 970                         goto nochange;
 971                 }
 972         } else {
 973                 search_context_csn = ber_dupbv( NULL, &op->o_sync_csn );
 974         }
 975 #endif
 976
 977         /* select candidates */
 978         if ( sop->oq_search.rs_scope == LDAP_SCOPE_BASE ) {
 979                 rs->sr_err = base_candidate( op->o_bd, &base, candidates );
 980
 981         } else {
 982                 BDB_IDL_ZERO( candidates );
 983                 BDB_IDL_ZERO( scopes );
 984                 rs->sr_err = search_candidates( op, sop, rs, &base,
 985                         locker, candidates, scopes );
 986         }
 987
 988 #ifdef BDB_PSEARCH
 989         if ( !IS_PSEARCH && sop->o_sync_mode != SLAP_SYNC_NONE ) {
 990                 bdb_cache_entry_db_unlock( bdb->bi_dbenv, &ctxcsn_lock );
 991         }
 992 #endif
 993
 994         /* start cursor at beginning of candidates.
 995          */
 996         cursor = 0;
 997 #ifdef BDB_PSEARCH
 998         if (IS_PSEARCH) {
 999                 if ( !BDB_IDL_IS_RANGE( candidates ) ) {
1000                         cursor = bdb_idl_search( candidates, ps_e->e_id );
1001                         if ( candidates[cursor] != ps_e->e_id ) {
1002                                 rs->sr_err = LDAP_SUCCESS;
1003                                 goto done;
1004                         }
1005                 } else if ( ps_e->e_id < BDB_IDL_RANGE_FIRST( candidates ) ||
1006                         ps_e->e_id > BDB_IDL_RANGE_LAST( candidates ))
1007                 {
1008                         rs->sr_err = LDAP_SUCCESS;
1009                         goto done;
1010                 }
1011                 candidates[0] = 1;
1012                 candidates[1] = ps_e->e_id;
1013         }
1014 #endif
1015
1016         if ( candidates[0] == 0 ) {
1017                 Debug( LDAP_DEBUG_TRACE,
1018                         LDAP_XSTRING(bdb_search) ": no candidates\n",
1019                         0, 0, 0 );
1020
1021                 goto nochange;
1022         }
1023
1024         /* if not root and candidates exceed to-be-checked entries, abort */
1025         if ( sop->ors_limit     /* isroot == FALSE */ &&
1026                 sop->ors_limit->lms_s_unchecked != -1 &&
1027                 BDB_IDL_N(candidates) > (unsigned) sop->ors_limit->lms_s_unchecked )
1028         {
1029                 rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
1030                 send_ldap_result( sop, rs );
1031                 rs->sr_err = LDAP_SUCCESS;
1032                 goto done;
1033         }
1034
1035         if ( sop->ors_limit == NULL     /* isroot == TRUE */ ||
1036                 !sop->ors_limit->lms_s_pr_hide )
1037         {
1038                 tentries = BDB_IDL_N(candidates);
1039         }
1040
1041         if ( get_pagedresults( sop ) > SLAP_CONTROL_IGNORED ) {
1042                 PagedResultsState *ps = sop->o_pagedresults_state;
1043                 /* deferred cookie parsing */
1044                 rs->sr_err = parse_paged_cookie( sop, rs );
1045                 if ( rs->sr_err != LDAP_SUCCESS ) {
1046                         send_ldap_result( sop, rs );
1047                         goto done;
1048                 }
1049
1050                 if ( (ID)( ps->ps_cookie ) == 0 ) {
1051                         id = bdb_idl_first( candidates, &cursor );
1052
1053                 } else {
1054                         if ( ps->ps_size == 0 ) {
1055                                 rs->sr_err = LDAP_SUCCESS;
1056                                 rs->sr_text = "search abandoned by pagedResult size=0";
1057                                 send_ldap_result( sop, rs );
1058                                 goto done;
1059                         }
1060                         for ( id = bdb_idl_first( candidates, &cursor );
1061                                 id != NOID &&
1062                                         id <= (ID)( ps->ps_cookie );
1063                                 id = bdb_idl_next( candidates, &cursor ) )
1064                         {
1065                                 /* empty */;
1066                         }
1067                 }
1068
1069                 if ( cursor == NOID ) {
1070                         Debug( LDAP_DEBUG_TRACE,
1071                                 LDAP_XSTRING(bdb_search)
1072                                 ": no paged results candidates\n",
1073                                 0, 0, 0 );
1074                         send_paged_response( sop, rs, &lastid, 0 );
1075
1076                         rs->sr_err = LDAP_OTHER;
1077                         goto done;
1078                 }
1079                 goto loop_begin;
1080         }
1081
1082 #ifdef BDB_PSEARCH
1083         if (( sop->o_sync_mode & SLAP_SYNC_REFRESH ) || IS_PSEARCH ) {
1084                 int match;
1085
1086                 cookief.f_choice = LDAP_FILTER_AND;
1087                 cookief.f_and = &csnfnot;
1088                 cookief.f_next = NULL;
1089
1090                 csnfnot.f_choice = LDAP_FILTER_NOT;
1091                 csnfnot.f_not = &csnfeq;
1092                 csnfnot.f_next = &csnfand;
1093
1094                 csnfeq.f_choice = LDAP_FILTER_EQUALITY;
1095                 csnfeq.f_ava = &aa_eq;
1096                 csnfeq.f_av_desc = slap_schema.si_ad_entryCSN;
1097                 if ( sop->o_sync_state.ctxcsn != NULL ) {
1098                         csnfeq.f_av_value = *sop->o_sync_state.ctxcsn;
1099                 } else {
1100                         csnfeq.f_av_value = slap_empty_bv;
1101                 }
1102
1103                 csnfand.f_choice = LDAP_FILTER_AND;
1104                 csnfand.f_and = &csnfge;
1105                 csnfand.f_next = NULL;
1106
1107                 csnfge.f_choice = LDAP_FILTER_GE;
1108                 csnfge.f_ava = &aa_ge;
1109                 csnfge.f_av_desc = slap_schema.si_ad_entryCSN;
1110                 if ( sop->o_sync_state.ctxcsn != NULL ) {
1111                         csnfge.f_av_value = *sop->o_sync_state.ctxcsn;
1112                 } else {
1113                         csnfge.f_av_value = slap_empty_bv;
1114                 }
1115
1116                 if ( search_context_csn && !IS_PSEARCH ) {
1117                         csnfge.f_next = &contextcsnand;
1118
1119                         contextcsnand.f_choice = LDAP_FILTER_AND;
1120                         contextcsnand.f_and = &contextcsnle;
1121                         contextcsnand.f_next = NULL;
1122
1123                         contextcsnle.f_choice = LDAP_FILTER_LE;
1124                         contextcsnle.f_ava = &aa_le;
1125                         contextcsnle.f_av_desc = slap_schema.si_ad_entryCSN;
1126                         contextcsnle.f_av_value = *search_context_csn;
1127                         contextcsnle.f_next = sop->oq_search.rs_filter;
1128
1129                         mr = slap_schema.si_ad_entryCSN->ad_type->sat_ordering;
1130                         if ( sop->o_sync_state.ctxcsn &&
1131                                 sop->o_sync_state.ctxcsn->bv_val != NULL )
1132                         {
1133                                 value_match( &match, slap_schema.si_ad_entryCSN, mr,
1134                                                 SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
1135                                                 &sop->o_sync_state.ctxcsn[0], search_context_csn,
1136                                                 &text );
1137                         } else {
1138                                 match = -1;
1139                         }
1140                         no_sync_state_change = ( match >= 0 );
1141                 } else {
1142                         csnfge.f_next = sop->oq_search.rs_filter;
1143                 }
1144         }
1145 #endif
1146
1147 loop_start:
1148
1149         for ( id = bdb_idl_first( candidates, &cursor );
1150                   id != NOID
1151 #ifdef BDB_PSEARCH
1152                         && !no_sync_state_change
1153 #endif
1154                 ; id = bdb_idl_next( candidates, &cursor ) )
1155         {
1156                 int scopeok = 0;
1157                 ID* idhole = NULL;
1158
1159 loop_begin:
1160
1161 #ifdef BDB_PSEARCH
1162                 if ( !IS_POST_SEARCH ) {
1163                         idhole = (ID*) avl_find( sop->o_psearch_finished,
1164                                                                          (caddr_t)&id, bdb_pfid_cmp );
1165                         if ( idhole ) {
1166                                 avl_delete( &sop->o_psearch_finished,
1167                                                         (caddr_t)idhole, bdb_pfid_cmp );
1168                                 sop->o_tmpfree( idhole, sop->o_tmpmemctx );
1169                                 goto loop_continue;
1170                         }
1171
1172                         if ( sop->o_refresh_in_progress ) {
1173                                 ldap_pvt_thread_mutex_lock( &sop->o_pcmutex );
1174                                 pce = LDAP_TAILQ_FIRST( &sop->o_ps_pre_candidates );
1175                                 while ( pce && pce->pc_sent ) {
1176                                         pce = LDAP_TAILQ_NEXT( pce, pc_link );
1177                                 }
1178                                 ldap_pvt_thread_mutex_unlock( &sop->o_pcmutex );
1179                                 if ( pce ) {
1180                                         ID pos;
1181                                         if ( BDB_IDL_IS_RANGE( candidates ) ) {
1182                                                 if ( pce->pc_id >= candidates[1] &&
1183                                                          pce->pc_id <= candidates[2] &&
1184                                                          pce->pc_id > cursor-1 ) {
1185                                                         id = pce->pc_id;
1186                                                         cursor--;
1187                                                         avl_insert( &sop->o_psearch_finished,
1188                                                                                 (caddr_t)bdb_id_dup( sop, &pce->pc_id ),
1189                                                                                 bdb_pfid_cmp, avl_dup_error );
1190                                                 } else {
1191                                                         pce->pc_sent = 1;
1192                                                 }
1193                                         } else {
1194                                                 pos = bdb_idl_search(candidates, pce->pc_id);
1195                                                 if ( pos > cursor-1 && pos <= candidates[0] ) {
1196                                                         id = pce->pc_id;
1197                                                         cursor--;
1198                                                         avl_insert( &sop->o_psearch_finished,
1199                                                                                 (caddr_t)bdb_id_dup( sop, &pce->pc_id ),
1200                                                                                 bdb_pfid_cmp, avl_dup_error );
1201                                                 } else {
1202                                                         pce->pc_sent = 1;
1203                                                 }
1204                                         }
1205                                 }
1206                         }
1207                 }
1208
1209                 /* check for abandon */
1210                 if ( sop->o_abandon ) {
1211                         if ( sop != op ) {
1212                                 bdb_drop_psearch( sop, sop->o_msgid );
1213                         }
1214                         rs->sr_err = LDAP_SUCCESS;
1215                         goto done;
1216                 }
1217
1218                 if ( sop->o_cancel ) {
1219                         assert( sop->o_cancel == SLAP_CANCEL_REQ );
1220                         rs->sr_err = LDAP_CANCELLED;
1221                         send_ldap_result( sop, rs );
1222                         sop->o_cancel = SLAP_CANCEL_ACK;
1223                         rs->sr_err = LDAP_SUCCESS;
1224                         goto done;
1225                 }
1226 #else
1227                 /* check for abandon */
1228                 if ( sop->o_abandon ) {
1229                         rs->sr_err = LDAP_SUCCESS;
1230                         goto done;
1231                 }
1232 #endif
1233
1234                 /* check time limit */
1235                 if ( sop->ors_tlimit != SLAP_NO_LIMIT
1236                                 && slap_get_time() > stoptime )
1237                 {
1238                         rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
1239                         rs->sr_ref = rs->sr_v2ref;
1240                         send_ldap_result( sop, rs );
1241                         rs->sr_err = LDAP_SUCCESS;
1242                         goto done;
1243                 }
1244
1245 #ifdef BDB_PSEARCH
1246                 if (!IS_PSEARCH) {
1247 #endif
1248 fetch_entry_retry:
1249                         /* get the entry with reader lock */
1250                         ei = NULL;
1251                         rs->sr_err = bdb_cache_find_id( op, ltid,
1252                                 id, &ei, 0, locker, &lock );
1253
1254                         if (rs->sr_err == LDAP_BUSY) {
1255                                 rs->sr_text = "ldap server busy";
1256                                 send_ldap_result( sop, rs );
1257                                 goto done;
1258
1259                         } else if ( rs->sr_err == DB_LOCK_DEADLOCK
1260                                 || rs->sr_err == DB_LOCK_NOTGRANTED )
1261                         {
1262                                 goto fetch_entry_retry;
1263                         }
1264
1265                         if ( ei && rs->sr_err == LDAP_SUCCESS ) {
1266                                 e = ei->bei_e;
1267                         } else {
1268                                 e = NULL;
1269                         }
1270
1271                         if ( e == NULL ) {
1272 #ifdef BDB_PSEARCH
1273                                 if ( IS_POST_SEARCH ) {
1274                                         /* send LDAP_SYNC_DELETE */
1275                                         rs->sr_entry = e = ps_e;
1276                                         goto post_search_no_entry;
1277                                 } else
1278 #endif
1279                                 if( !BDB_IDL_IS_RANGE(candidates) ) {
1280                                         /* only complain for non-range IDLs */
1281                                         Debug( LDAP_DEBUG_TRACE,
1282                                                 LDAP_XSTRING(bdb_search)
1283                                                 ": candidate %ld not found\n",
1284                                                 (long) id, 0, 0 );
1285                                 }
1286
1287                                 goto loop_continue;
1288                         }
1289 #ifdef BDB_PSEARCH
1290                 } else {
1291                         e = ps_e;
1292                 }
1293 #endif
1294
1295                 rs->sr_entry = e;
1296
1297 #ifdef BDB_SUBENTRIES
1298                 /* FIXME: send all but syncrepl */
1299 #if 0
1300                 if ( !is_sync_protocol( sop ) )
1301 #endif
1302                 {
1303                         if ( is_entry_subentry( e ) ) {
1304                                 if( sop->oq_search.rs_scope != LDAP_SCOPE_BASE ) {
1305                                         if(!get_subentries_visibility( sop )) {
1306                                                 /* only subentries are visible */
1307                                                 goto loop_continue;
1308                                         }
1309
1310                                 } else if ( get_subentries( sop ) &&
1311                                         !get_subentries_visibility( sop ))
1312                                 {
1313                                         /* only subentries are visible */
1314                                         goto loop_continue;
1315                                 }
1316
1317                         } else if ( get_subentries_visibility( sop )) {
1318                                 /* only subentries are visible */
1319                                 goto loop_continue;
1320                         }
1321                 }
1322 #endif /* BDB_SUBENTRIES */
1323
1324                 /* Does this candidate actually satisfy the search scope?
1325                  *
1326                  * Note that we don't lock access to the bei_parent pointer.
1327                  * Since only leaf nodes can be deleted, the parent of any
1328                  * node will always be a valid node. Also since we have
1329                  * a Read lock on the data, it cannot be renamed out of the
1330                  * scope while we are looking at it, and unless we're using
1331                  * BDB_HIER, its parents cannot be moved either.
1332                  */
1333                 switch( sop->ors_scope ) {
1334                 case LDAP_SCOPE_BASE:
1335                         /* This is always true, yes? */
1336                         if ( id == base.e_id ) scopeok = 1;
1337                         break;
1338
1339                 case LDAP_SCOPE_ONELEVEL:
1340                         if ( ei->bei_parent->bei_id == base.e_id ) scopeok = 1;
1341                         break;
1342
1343 #ifdef LDAP_SCOPE_CHILDREN
1344                 case LDAP_SCOPE_CHILDREN:
1345                         if ( id == base.e_id ) break;
1346                         /* Fall-thru */
1347 #endif
1348                 case LDAP_SCOPE_SUBTREE: {
1349                         EntryInfo *tmp;
1350                         for ( tmp = BEI(e); tmp; tmp = tmp->bei_parent ) {
1351                                 if ( tmp->bei_id == base.e_id ) {
1352                                         scopeok = 1;
1353                                         break;
1354                                 }
1355                         }
1356                         } break;
1357                 }
1358
1359                 /* aliases were already dereferenced in candidate list */
1360                 if ( sop->ors_deref & LDAP_DEREF_SEARCHING ) {
1361                         /* but if the search base is an alias, and we didn't
1362                          * deref it when finding, return it.
1363                          */
1364                         if ( is_entry_alias(e) &&
1365                                 ((sop->ors_deref & LDAP_DEREF_FINDING) ||
1366                                         !bvmatch(&e->e_nname, &op->o_req_ndn)))
1367                         {
1368                                 goto loop_continue;
1369                         }
1370
1371                         /* scopes is only non-empty for onelevel or subtree */
1372                         if ( !scopeok && BDB_IDL_N(scopes) ) {
1373                                 unsigned x;
1374                                 if ( sop->ors_scope == LDAP_SCOPE_ONELEVEL ) {
1375                                         x = bdb_idl_search( scopes, e->e_id );
1376                                         if ( scopes[x] == e->e_id ) scopeok = 1;
1377                                 } else {
1378                                         /* subtree, walk up the tree */
1379                                         EntryInfo *tmp = BEI(e);
1380                                         for (;tmp->bei_parent; tmp=tmp->bei_parent) {
1381                                                 x = bdb_idl_search( scopes, tmp->bei_id );
1382                                                 if ( scopes[x] == tmp->bei_id ) {
1383                                                         scopeok = 1;
1384                                                         break;
1385                                                 }
1386                                         }
1387                                 }
1388                         }
1389                 }
1390
1391                 /* Not in scope, ignore it */
1392 #ifdef BDB_PSEARCH
1393                 if ( !IS_POST_SEARCH && !scopeok )
1394 #else
1395                 if ( !scopeok )
1396 #endif
1397                 {
1398                         Debug( LDAP_DEBUG_TRACE,
1399                                 LDAP_XSTRING(bdb_search)
1400                                 ": %ld scope not okay\n",
1401                                 (long) id, 0, 0 );
1402                         goto loop_continue;
1403                 }
1404
1405                 /*
1406                  * if it's a referral, add it to the list of referrals. only do
1407                  * this for non-base searches, and don't check the filter
1408                  * explicitly here since it's only a candidate anyway.
1409                  */
1410                 if ( !manageDSAit && sop->oq_search.rs_scope != LDAP_SCOPE_BASE
1411                         && is_entry_referral( e ) )
1412                 {
1413                         BerVarray erefs = get_entry_referrals( sop, e );
1414                         rs->sr_ref = referral_rewrite( erefs, &e->e_name, NULL,
1415                                 sop->oq_search.rs_scope == LDAP_SCOPE_ONELEVEL
1416                                         ? LDAP_SCOPE_BASE : LDAP_SCOPE_SUBTREE );
1417
1418                         send_search_reference( sop, rs );
1419
1420                         ber_bvarray_free( rs->sr_ref );
1421                         ber_bvarray_free( erefs );
1422                         rs->sr_ref = NULL;
1423
1424                         goto loop_continue;
1425                 }
1426
1427                 if ( !manageDSAit && is_entry_glue( e )) {
1428                         goto loop_continue;
1429                 }
1430
1431                 /* if it matches the filter and scope, send it */
1432 #ifndef BDB_PSEARCH
1433                 rs->sr_err = test_filter( sop, rs->sr_entry, sop->oq_search.rs_filter );
1434 #else
1435                 if (IS_PSEARCH) {
1436                         if (ps_type != LDAP_PSEARCH_BY_SCOPEOUT) {
1437                                 rs->sr_err = test_filter( sop, rs->sr_entry, &cookief );
1438                         } else {
1439                                 rs->sr_err = LDAP_COMPARE_TRUE;
1440                         }
1441
1442                 } else {
1443                         if ( !IS_POST_SEARCH ) {
1444                                 if ( sop->o_sync_mode & SLAP_SYNC_REFRESH ) {
1445                                         rc_sync = test_filter( sop, rs->sr_entry, &cookief );
1446                                         rs->sr_err = test_filter( sop, rs->sr_entry,
1447                                                                                 &contextcsnand );
1448                                         if ( rs->sr_err == LDAP_COMPARE_TRUE ) {
1449                                                 if ( rc_sync == LDAP_COMPARE_TRUE ) {
1450                                                         if ( no_sync_state_change ) {
1451                                                                 Debug( LDAP_DEBUG_TRACE,
1452                                                                         LDAP_XSTRING(bdb_search) ": "
1453                                                                         "error in context csn management\n",
1454                                                                         0, 0, 0 );
1455                                                         }
1456                                                         entry_sync_state = LDAP_SYNC_ADD;
1457
1458                                                 } else {
1459                                                         if ( no_sync_state_change ) {
1460                                                                 goto loop_continue;
1461                                                         }
1462                                                         entry_sync_state = LDAP_SYNC_PRESENT;
1463                                                 }
1464                                         }
1465                                 } else {
1466                                         rs->sr_err = test_filter( sop,
1467                                                 rs->sr_entry, sop->oq_search.rs_filter );
1468                                 }
1469                         } else {
1470                                 if ( scopeok ) {
1471                                         rs->sr_err = test_filter( sop,
1472                                                 rs->sr_entry, sop->oq_search.rs_filter );
1473                                 } else {
1474                                         rs->sr_err = LDAP_COMPARE_TRUE;
1475                                 }
1476                         }
1477                 }
1478 #endif
1479
1480                 if ( rs->sr_err == LDAP_COMPARE_TRUE ) {
1481                         /* check size limit */
1482                         if ( --sop->ors_slimit == -1
1483 #ifdef BDB_PSEARCH
1484                                 && sop->o_sync_slog_size == -1
1485 #endif
1486                          ) {
1487 #ifdef BDB_PSEARCH
1488                                 if (!IS_PSEARCH) {
1489 #endif
1490 #ifdef SLAP_ZONE_ALLOC
1491                                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
1492 #endif
1493                                         bdb_cache_return_entry_r( bdb->bi_dbenv,
1494                                                 &bdb->bi_cache, e, &lock );
1495 #ifdef BDB_PSEARCH
1496                                 }
1497 #endif
1498                                 e = NULL;
1499                                 rs->sr_entry = NULL;
1500                                 rs->sr_err = LDAP_SIZELIMIT_EXCEEDED;
1501                                 rs->sr_ref = rs->sr_v2ref;
1502                                 send_ldap_result( sop, rs );
1503                                 rs->sr_err = LDAP_SUCCESS;
1504                                 goto done;
1505                         }
1506
1507                         if ( get_pagedresults(sop) > SLAP_CONTROL_IGNORED ) {
1508                                 if ( rs->sr_nentries >= ((PagedResultsState *)sop->o_pagedresults_state)->ps_size ) {
1509                                         send_paged_response( sop, rs, &lastid, tentries );
1510                                         goto done;
1511                                 }
1512                                 lastid = id;
1513                         }
1514
1515                         if (e) {
1516                                 /* safe default */
1517                                 int result = -1;
1518 #ifdef BDB_PSEARCH
1519                                 if (IS_PSEARCH || IS_POST_SEARCH) {
1520                                         int premodify_found = 0;
1521
1522                                         if ( IS_POST_SEARCH ||
1523                                                  ps_type == LDAP_PSEARCH_BY_ADD ||
1524                                                  ps_type == LDAP_PSEARCH_BY_DELETE ||
1525                                                  ps_type == LDAP_PSEARCH_BY_MODIFY ||
1526                                                  ps_type == LDAP_PSEARCH_BY_SCOPEOUT )
1527                                         {
1528                                                 if ( !IS_POST_SEARCH &&
1529                                                          ps_type == LDAP_PSEARCH_BY_MODIFY ) {
1530                                                         struct psid_entry* psid_e;
1531                                                         LDAP_LIST_FOREACH( psid_e,
1532                                                                 &op->o_pm_list, ps_link)
1533                                                         {
1534                                                                 if( psid_e->ps_op == sop ) {
1535                                                                         premodify_found = 1;
1536                                                                         LDAP_LIST_REMOVE(psid_e, ps_link);
1537                                                                         break;
1538                                                                 }
1539                                                         }
1540                                                         if (psid_e != NULL) free (psid_e);
1541                                                 }
1542
1543                                                 if ( IS_POST_SEARCH ) {
1544                                                         if ( scopeok ) {
1545                                                                 entry_sync_state = LDAP_SYNC_ADD;
1546                                                         } else {
1547 post_search_no_entry:
1548                                                                 entry_sync_state = LDAP_SYNC_DELETE;
1549                                                         }
1550                                                 } else if ( ps_type == LDAP_PSEARCH_BY_ADD ) {
1551                                                         entry_sync_state = LDAP_SYNC_ADD;
1552                                                 } else if ( ps_type == LDAP_PSEARCH_BY_DELETE ) {
1553                                                         entry_sync_state = LDAP_SYNC_DELETE;
1554                                                 } else if ( ps_type == LDAP_PSEARCH_BY_MODIFY ) {
1555                                                         if ( premodify_found ) {
1556                                                                 entry_sync_state = LDAP_SYNC_MODIFY;
1557                                                         } else {
1558                                                                 entry_sync_state = LDAP_SYNC_ADD;
1559                                                         }
1560                                                 } else if ( ps_type == LDAP_PSEARCH_BY_SCOPEOUT ) {
1561                                                         entry_sync_state = LDAP_SYNC_DELETE;
1562                                                 } else {
1563                                                         rs->sr_err = LDAP_OTHER;
1564                                                         goto done;
1565                                                 }
1566
1567                                                 if ( sop->o_sync_slog_size != -1 ) {
1568                                                         if ( entry_sync_state == LDAP_SYNC_DELETE ) {
1569                                                                 result = slap_add_session_log( op, sop, e );
1570                                                         } else {
1571                                                                 result = 1;
1572                                                         }
1573                                                 } else {
1574                                                         struct berval cookie;
1575                                                         slap_compose_sync_cookie( sop, &cookie,
1576                                                                 search_context_csn,
1577                                                                 sop->o_sync_state.sid,
1578                                                                 sop->o_sync_state.rid );
1579                                                         rs->sr_err = slap_build_sync_state_ctrl(
1580                                                                 sop, rs, e, entry_sync_state, ctrls,
1581                                                                 num_ctrls++, 1, &cookie );
1582                                                         if ( rs->sr_err != LDAP_SUCCESS ) goto done;
1583                                                         if (!(IS_POST_SEARCH &&
1584                                                                 entry_sync_state == LDAP_SYNC_DELETE)) {
1585                                                                 rs->sr_attrs = attrs;
1586                                                         } else {
1587                                                                 rs->sr_attrs = NULL;
1588                                                         }
1589                                                         rs->sr_operational_attrs = NULL;
1590                                                         rs->sr_ctrls = ctrls;
1591                                                         rs->sr_flags = 0;
1592                                                         result = send_search_entry( sop, rs );
1593                                                         if ( cookie.bv_val ) ch_free( cookie.bv_val );
1594                                                         slap_sl_free(
1595                                                                 ctrls[num_ctrls-1]->ldctl_value.bv_val,
1596                                                                 sop->o_tmpmemctx );
1597                                                         slap_sl_free( ctrls[--num_ctrls],
1598                                                                 sop->o_tmpmemctx );
1599                                                         ctrls[num_ctrls] = NULL;
1600                                                         rs->sr_ctrls = NULL;
1601                                                 }
1602
1603                                         } else if ( ps_type == LDAP_PSEARCH_BY_PREMODIFY ) {
1604                                                 struct psid_entry* psid_e;
1605                                                 psid_e = (struct psid_entry *) ch_calloc(1,
1606                                                         sizeof(struct psid_entry));
1607                                                 psid_e->ps_op = sop;
1608                                                 LDAP_LIST_INSERT_HEAD( &op->o_pm_list,
1609                                                         psid_e, ps_link );
1610
1611                                         } else {
1612                                                 Debug( LDAP_DEBUG_TRACE,
1613                                                         LDAP_XSTRING(bdb_search)
1614                                                         ": invalid ps_type (%d) \n",
1615                                                         ps_type, 0, 0);
1616                                         }
1617
1618                                 } else {
1619                                         if ( sop->o_sync_mode & SLAP_SYNC_REFRESH ) {
1620                                                 if ( rc_sync == LDAP_COMPARE_TRUE ) { /* ADD */
1621                                                         rs->sr_err = slap_build_sync_state_ctrl(
1622                                                                 sop, rs, e, entry_sync_state, ctrls,
1623                                                                 num_ctrls++, 0, NULL );
1624                                                         if ( rs->sr_err != LDAP_SUCCESS ) goto done;
1625                                                         rs->sr_ctrls = ctrls;
1626                                                         rs->sr_attrs = sop->oq_search.rs_attrs;
1627                                                         rs->sr_operational_attrs = NULL;
1628                                                         rs->sr_flags = 0;
1629                                                         result = send_search_entry( sop, rs );
1630                                                         slap_sl_free(
1631                                                                 ctrls[num_ctrls-1]->ldctl_value.bv_val,
1632                                                                 sop->o_tmpmemctx );
1633                                                         slap_sl_free( ctrls[--num_ctrls],
1634                                                                 sop->o_tmpmemctx );
1635                                                         ctrls[num_ctrls] = NULL;
1636                                                         rs->sr_ctrls = NULL;
1637
1638                                                 } else { /* PRESENT */
1639                                                         if ( sync_send_present_mode ) {
1640                                                                 result = slap_build_syncUUID_set( sop,
1641                                                                         &syncUUID_set, e );
1642                                                                 if ( result <= 0 ) {
1643                                                                         result = -1;
1644                                                                 } else {
1645                                                                         syncUUID_set_cnt++;
1646                                                                         if ( syncUUID_set_cnt ==
1647                                                                                 SLAP_SYNCUUID_SET_SIZE )
1648                                                                         {
1649                                                                                 rs->sr_err = LDAP_SUCCESS;
1650                                                                                 rs->sr_rspoid = LDAP_SYNC_INFO;
1651                                                                                 rs->sr_ctrls = NULL;
1652                                                                                 result = slap_send_syncinfo( sop, rs,
1653                                                                                         LDAP_TAG_SYNC_ID_SET,
1654                                                                                         NULL, 0, syncUUID_set, 0 );
1655                                                                                 if ( result != LDAP_SUCCESS ) {
1656                                                                                         result = -1;
1657                                                                                 }
1658                                                                                 ber_bvarray_free_x( syncUUID_set,
1659                                                                                         sop->o_tmpmemctx );
1660                                                                                 syncUUID_set = NULL;
1661                                                                                 syncUUID_set_cnt = 0;
1662                                                                         }
1663                                                                 }
1664
1665                                                         } else {
1666                                                                 result = 1;
1667                                                         }
1668                                                 }
1669
1670                                         } else {
1671 #endif
1672                                                 rs->sr_attrs = sop->oq_search.rs_attrs;
1673                                                 rs->sr_operational_attrs = NULL;
1674                                                 rs->sr_ctrls = NULL;
1675                                                 rs->sr_flags = 0;
1676                                                 rs->sr_err = LDAP_SUCCESS;
1677                                                 result = send_search_entry( sop, rs );
1678 #ifdef BDB_PSEARCH
1679                                         }
1680                                 }
1681 #endif
1682
1683                                 switch (result) {
1684                                 case 0:         /* entry sent ok */
1685                                         break;
1686                                 case 1:         /* entry not sent */
1687                                         break;
1688                                 case -1:        /* connection closed */
1689 #ifdef BDB_PSEARCH
1690                                         if (!IS_PSEARCH) {
1691 #endif
1692 #ifdef SLAP_ZONE_ALLOC
1693                                                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
1694 #endif
1695                                                 bdb_cache_return_entry_r(bdb->bi_dbenv,
1696                                                         &bdb->bi_cache, e, &lock);
1697 #ifdef BDB_PSEARCH
1698                                         }
1699 #endif
1700                                         e = NULL;
1701                                         rs->sr_entry = NULL;
1702                                         rs->sr_err = LDAP_OTHER;
1703                                         goto done;
1704                                 }
1705                         }
1706
1707                 } else {
1708                         Debug( LDAP_DEBUG_TRACE,
1709                                 LDAP_XSTRING(bdb_search)
1710                                 ": %ld does not match filter\n",
1711                                 (long) id, 0, 0 );
1712                 }
1713
1714 loop_continue:
1715                 if( e != NULL ) {
1716                         /* free reader lock */
1717 #ifdef BDB_PSEARCH
1718                         if (!IS_PSEARCH) {
1719                                 if (!(IS_POST_SEARCH &&
1720                                                  entry_sync_state == LDAP_SYNC_DELETE)) {
1721 #ifdef SLAP_ZONE_ALLOC
1722                                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
1723 #endif
1724                                         bdb_cache_return_entry_r( bdb->bi_dbenv,
1725                                                 &bdb->bi_cache, e , &lock );
1726                                         if ( sop->o_nocaching ) {
1727                                                 bdb_cache_delete_entry( bdb, ei, locker, &lock );
1728                                         }
1729                                 }
1730                         }
1731 #else
1732 #ifdef SLAP_ZONE_ALLOC
1733                         slap_zn_runlock(bdb->bi_cache.c_zctx, e);
1734 #endif
1735                         bdb_cache_return_entry_r( bdb->bi_dbenv,
1736                                 &bdb->bi_cache, e , &lock );
1737 #endif
1738                         e = NULL;
1739                         rs->sr_entry = NULL;
1740                 }
1741
1742 #ifdef BDB_PSEARCH
1743                 if ( sop->o_refresh_in_progress ) {
1744                         if ( pce ) {
1745                                 pce->pc_sent = 1;
1746                         }
1747                 }
1748 #endif
1749
1750                 ldap_pvt_thread_yield();
1751         }
1752
1753 #ifdef BDB_PSEARCH
1754         if ( syncUUID_set_cnt > 0 ) {
1755                 rs->sr_err = LDAP_SUCCESS;
1756                 rs->sr_rspoid = LDAP_SYNC_INFO;
1757                 rs->sr_ctrls = NULL;
1758                 slap_send_syncinfo( sop, rs, LDAP_TAG_SYNC_ID_SET,
1759                         NULL, 0, syncUUID_set, 0 );
1760                 ber_bvarray_free_x( syncUUID_set, sop->o_tmpmemctx );
1761                 syncUUID_set_cnt = 0;
1762         }
1763 #endif
1764
1765 nochange:
1766 #ifdef BDB_PSEARCH
1767         if (!IS_PSEARCH && !IS_POST_SEARCH) {
1768                 if ( sop->o_sync_mode & SLAP_SYNC_REFRESH ) {
1769                         if ( sop->o_sync_mode & SLAP_SYNC_PERSIST ) {
1770                                 struct berval cookie;
1771                                 slap_compose_sync_cookie( sop, &cookie, search_context_csn,
1772                                         sop->o_sync_state.sid, sop->o_sync_state.rid );
1773
1774                                 if ( sync_send_present_mode ) {
1775                                         rs->sr_err = LDAP_SUCCESS;
1776                                         rs->sr_rspoid = LDAP_SYNC_INFO;
1777                                         rs->sr_ctrls = NULL;
1778                                         slap_send_syncinfo( sop, rs,
1779                                                 LDAP_TAG_SYNC_REFRESH_PRESENT, &cookie, 1, NULL, 0 );
1780
1781                                 } else {
1782                                         if ( !no_sync_state_change ) {
1783                                                 int slog_found = 0;
1784                                                 ldap_pvt_thread_rdwr_rlock( &bdb->bi_pslist_rwlock );
1785                                                 LDAP_LIST_FOREACH( ps_list, &bdb->bi_psearch_list,
1786                                                         o_ps_link )
1787                                                 {
1788                                                         if ( ps_list->o_sync_slog_size > 0 ) {
1789                                                                 if ( ps_list->o_sync_state.sid ==
1790                                                                         sop->o_sync_state.sid )
1791                                                                 {
1792                                                                         slog_found = 1;
1793                                                                         break;
1794                                                                 }
1795                                                         }
1796                                                 }
1797
1798                                                 if ( slog_found ) {
1799                                                         rs->sr_err = LDAP_SUCCESS;
1800                                                         rs->sr_rspoid = NULL;
1801                                                         rs->sr_ctrls = NULL;
1802                                                         slap_send_session_log( op, ps_list, rs );
1803                                                 }
1804                                                 ldap_pvt_thread_rdwr_runlock( &bdb->bi_pslist_rwlock );
1805                                         }
1806
1807                                         rs->sr_err = LDAP_SUCCESS;
1808                                         rs->sr_rspoid = LDAP_SYNC_INFO;
1809                                         rs->sr_ctrls = NULL;
1810                                         slap_send_syncinfo( sop, rs,
1811                                                 LDAP_TAG_SYNC_REFRESH_DELETE, &cookie, 1, NULL, 0 );
1812                                 }
1813
1814                                 if ( cookie.bv_val ) ch_free( cookie.bv_val );
1815
1816                         } else {
1817                                 /* refreshOnly mode */
1818                                 struct berval cookie;
1819                                 slap_compose_sync_cookie( sop, &cookie, search_context_csn,
1820                                         sop->o_sync_state.sid, sop->o_sync_state.rid );
1821
1822                                 if ( sync_send_present_mode ) {
1823                                         slap_build_sync_done_ctrl( sop, rs, ctrls,
1824                                                 num_ctrls++, 1, &cookie, LDAP_SYNC_REFRESH_PRESENTS );
1825
1826                                 } else {
1827                                         if ( !no_sync_state_change ) {
1828                                                 int slog_found = 0;
1829                                                 ldap_pvt_thread_rdwr_rlock( &bdb->bi_pslist_rwlock );
1830                                                 LDAP_LIST_FOREACH( ps_list, &bdb->bi_psearch_list,
1831                                                         o_ps_link )
1832                                                 {
1833                                                         if ( ps_list->o_sync_slog_size > 0 ) {
1834                                                                 if ( ps_list->o_sync_state.sid ==
1835                                                                                 sop->o_sync_state.sid ) {
1836                                                                         slog_found = 1;
1837                                                                         break;
1838                                                                 }
1839                                                         }
1840                                                 }
1841
1842                                                 if ( slog_found ) {
1843                                                         slap_send_session_log( op, ps_list, rs );
1844                                                 }
1845                                                 ldap_pvt_thread_rdwr_runlock( &bdb->bi_pslist_rwlock );
1846                                         }
1847
1848                                         slap_build_sync_done_ctrl( sop, rs, ctrls,
1849                                                 num_ctrls++, 1, &cookie, LDAP_SYNC_REFRESH_DELETES );
1850                                 }
1851
1852                                 rs->sr_ctrls = ctrls;
1853                                 rs->sr_ref = rs->sr_v2ref;
1854                                 rs->sr_err = (rs->sr_v2ref == NULL)
1855                                         ? LDAP_SUCCESS : LDAP_REFERRAL;
1856                                 rs->sr_rspoid = NULL;
1857                                 send_ldap_result( sop, rs );
1858                                 if ( ctrls[num_ctrls-1]->ldctl_value.bv_val != NULL ) {
1859                                         slap_sl_free( ctrls[num_ctrls-1]->ldctl_value.bv_val,
1860                                                 sop->o_tmpmemctx );
1861                                 }
1862                                 slap_sl_free( ctrls[--num_ctrls], sop->o_tmpmemctx );
1863                                 ctrls[num_ctrls] = NULL;
1864                                 if ( cookie.bv_val ) ch_free( cookie.bv_val );
1865                         }
1866
1867                 } else {
1868 #endif
1869                         rs->sr_ctrls = NULL;
1870                         rs->sr_ref = rs->sr_v2ref;
1871                         rs->sr_err = (rs->sr_v2ref == NULL) ? LDAP_SUCCESS : LDAP_REFERRAL;
1872                         rs->sr_rspoid = NULL;
1873                         if ( get_pagedresults(sop) > SLAP_CONTROL_IGNORED ) {
1874                                 send_paged_response( sop, rs, NULL, 0 );
1875                         } else {
1876                                 send_ldap_result( sop, rs );
1877                         }
1878 #ifdef BDB_PSEARCH
1879                 }
1880         }
1881
1882         if ( sop->o_refresh_in_progress ) {
1883                 sop->o_refresh_in_progress = 0;
1884         }
1885 #endif
1886
1887         rs->sr_err = LDAP_SUCCESS;
1888
1889 done:
1890 #ifdef BDB_PSEARCH
1891         if ( sop->o_psearch_finished ) {
1892                 avl_free( sop->o_psearch_finished, ch_free );
1893         }
1894
1895         if( !IS_PSEARCH && e != NULL ) {
1896                 /* free reader lock */
1897 #ifdef SLAP_ZONE_ALLOC
1898                 slap_zn_runlock(bdb->bi_cache.c_zctx, e);
1899 #endif
1900                 bdb_cache_return_entry_r( bdb->bi_dbenv, &bdb->bi_cache, e, &lock );
1901         }
1902         ber_bvfree( search_context_csn );
1903 #endif
1904
1905         if ( !opinfo )
1906                 LOCK_ID_FREE( bdb->bi_dbenv, locker );
1907
1908         if( rs->sr_v2ref ) {
1909                 ber_bvarray_free( rs->sr_v2ref );
1910                 rs->sr_v2ref = NULL;
1911         }
1912         if( realbase.bv_val ) ch_free( realbase.bv_val );
1913
1914         return rs->sr_err;
1915 }
1916
1917
1918 static int base_candidate(
1919         BackendDB       *be,
1920         Entry   *e,
1921         ID              *ids )
1922 {
1923         Debug(LDAP_DEBUG_ARGS, "base_candidates: base: \"%s\" (0x%08lx)\n",
1924                 e->e_nname.bv_val, (long) e->e_id, 0);
1925
1926         ids[0] = 1;
1927         ids[1] = e->e_id;
1928         return 0;
1929 }
1930
1931 /* Look for "objectClass Present" in this filter.
1932  * Also count depth of filter tree while we're at it.
1933  */
1934 static int oc_filter(
1935         Filter *f,
1936         int cur,
1937         int *max )
1938 {
1939         int rc = 0;
1940
1941         assert( f );
1942
1943         if( cur > *max ) *max = cur;
1944
1945         switch( f->f_choice ) {
1946         case LDAP_FILTER_PRESENT:
1947                 if (f->f_desc == slap_schema.si_ad_objectClass) {
1948                         rc = 1;
1949                 }
1950                 break;
1951
1952         case LDAP_FILTER_AND:
1953         case LDAP_FILTER_OR:
1954                 cur++;
1955                 for ( f=f->f_and; f; f=f->f_next ) {
1956                         (void) oc_filter(f, cur, max);
1957                 }
1958                 break;
1959
1960         default:
1961                 break;
1962         }
1963         return rc;
1964 }
1965
1966 static void search_stack_free( void *key, void *data )
1967 {
1968         ber_memfree_x(data, NULL);
1969 }
1970
1971 static void *search_stack( Operation *op )
1972 {
1973         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
1974         void *ret = NULL;
1975
1976         if ( op->o_threadctx ) {
1977                 ldap_pvt_thread_pool_getkey( op->o_threadctx, search_stack,
1978                         &ret, NULL );
1979         } else {
1980                 ret = bdb->bi_search_stack;
1981         }
1982
1983         if ( !ret ) {
1984                 ret = ch_malloc( bdb->bi_search_stack_depth * BDB_IDL_UM_SIZE
1985                         * sizeof( ID ) );
1986                 if ( op->o_threadctx ) {
1987                         ldap_pvt_thread_pool_setkey( op->o_threadctx, search_stack,
1988                                 ret, search_stack_free );
1989                 } else {
1990                         bdb->bi_search_stack = ret;
1991                 }
1992         }
1993         return ret;
1994 }
1995
1996 static int search_candidates(
1997         Operation *stackop,
1998         Operation *op,
1999         SlapReply *rs,
2000         Entry *e,
2001         u_int32_t locker,
2002         ID      *ids,
2003         ID      *scopes )
2004 {
2005         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
2006         int rc, depth = 1;
2007         Filter          f, rf, xf, nf;
2008         ID              *stack;
2009         AttributeAssertion aa_ref;
2010 #ifdef BDB_SUBENTRIES
2011         Filter  sf;
2012         AttributeAssertion aa_subentry;
2013 #endif
2014
2015         /*
2016          * This routine takes as input a filter (user-filter)
2017          * and rewrites it as follows:
2018          *      (&(scope=DN)[(objectClass=subentry)]
2019          *              (|[(objectClass=referral)(objectClass=alias)](user-filter))
2020          */
2021
2022         Debug(LDAP_DEBUG_TRACE,
2023                 "search_candidates: base=\"%s\" (0x%08lx) scope=%d\n",
2024                 e->e_nname.bv_val, (long) e->e_id, op->oq_search.rs_scope );
2025
2026         xf.f_or = op->oq_search.rs_filter;
2027         xf.f_choice = LDAP_FILTER_OR;
2028         xf.f_next = NULL;
2029
2030         /* If the user's filter uses objectClass=*,
2031          * these clauses are redundant.
2032          */
2033         if (!oc_filter(op->oq_search.rs_filter, 1, &depth)
2034                 && !get_subentries_visibility(op)
2035 #ifdef BDB_PSEARCH
2036                 && !is_sync_protocol(op)
2037 #endif
2038         ) {
2039                 if( !get_manageDSAit(op) && !get_domainScope(op) ) {
2040                         /* match referral objects */
2041                         struct berval bv_ref = BER_BVC( "referral" );
2042                         rf.f_choice = LDAP_FILTER_EQUALITY;
2043                         rf.f_ava = &aa_ref;
2044                         rf.f_av_desc = slap_schema.si_ad_objectClass;
2045                         rf.f_av_value = bv_ref;
2046                         rf.f_next = xf.f_or;
2047                         xf.f_or = &rf;
2048                         depth++;
2049                 }
2050         }
2051
2052         f.f_next = NULL;
2053         f.f_choice = LDAP_FILTER_AND;
2054         f.f_and = &nf;
2055         /* Dummy; we compute scope separately now */
2056         nf.f_choice = SLAPD_FILTER_COMPUTED;
2057         nf.f_result = LDAP_SUCCESS;
2058         nf.f_next = ( xf.f_or == op->oq_search.rs_filter )
2059                 ? op->oq_search.rs_filter : &xf ;
2060         /* Filter depth increased again, adding dummy clause */
2061         depth++;
2062
2063 #ifdef BDB_SUBENTRIES
2064         if( get_subentries_visibility( op ) ) {
2065                 struct berval bv_subentry = BER_BVC( "subentry" );
2066                 sf.f_choice = LDAP_FILTER_EQUALITY;
2067                 sf.f_ava = &aa_subentry;
2068                 sf.f_av_desc = slap_schema.si_ad_objectClass;
2069                 sf.f_av_value = bv_subentry;
2070                 sf.f_next = nf.f_next;
2071                 nf.f_next = &sf;
2072         }
2073 #endif
2074
2075         /* Allocate IDL stack, plus 1 more for former tmp */
2076         if ( depth+1 > bdb->bi_search_stack_depth ) {
2077                 stack = ch_malloc( (depth + 1) * BDB_IDL_UM_SIZE * sizeof( ID ) );
2078         } else {
2079                 stack = search_stack( stackop );
2080         }
2081
2082         if( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2083                 rc = search_aliases( op, rs, e, locker, ids, scopes, stack );
2084         } else {
2085                 rc = bdb_dn2idl( op, e, ids, stack );
2086         }
2087
2088         if ( rc == LDAP_SUCCESS ) {
2089                 rc = bdb_filter_candidates( op, &f, ids,
2090                         stack, stack+BDB_IDL_UM_SIZE );
2091         }
2092
2093         if ( depth+1 > bdb->bi_search_stack_depth ) {
2094                 ch_free( stack );
2095         }
2096
2097         if( rc ) {
2098                 Debug(LDAP_DEBUG_TRACE,
2099                         "bdb_search_candidates: failed (rc=%d)\n",
2100                         rc, NULL, NULL );
2101
2102         } else {
2103                 Debug(LDAP_DEBUG_TRACE,
2104                         "bdb_search_candidates: id=%ld first=%ld last=%ld\n",
2105                         (long) ids[0],
2106                         (long) BDB_IDL_FIRST(ids),
2107                         (long) BDB_IDL_LAST(ids) );
2108         }
2109
2110         return rc;
2111 }
2112
2113 static int
2114 parse_paged_cookie( Operation *op, SlapReply *rs )
2115 {
2116         LDAPControl     **c;
2117         int             rc = LDAP_SUCCESS;
2118         ber_tag_t       tag;
2119         ber_int_t       size;
2120         BerElement      *ber;
2121         struct berval   cookie = BER_BVNULL;
2122         PagedResultsState *ps = op->o_pagedresults_state;
2123
2124         /* this function must be invoked only if the pagedResults
2125          * control has been detected, parsed and partially checked
2126          * by the frontend */
2127         assert( get_pagedresults( op ) > SLAP_CONTROL_IGNORED );
2128
2129         /* look for the appropriate ctrl structure */
2130         for ( c = op->o_ctrls; c[0] != NULL; c++ ) {
2131                 if ( strcmp( c[0]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS ) == 0 )
2132                 {
2133                         break;
2134                 }
2135         }
2136
2137         if ( c[0] == NULL ) {
2138                 rs->sr_text = "missing pagedResults control";
2139                 return LDAP_PROTOCOL_ERROR;
2140         }
2141
2142         /* Tested by frontend */
2143         assert( c[0]->ldctl_value.bv_len > 0 );
2144
2145         /* Parse the control value
2146          *      realSearchControlValue ::= SEQUENCE {
2147          *              size    INTEGER (0..maxInt),
2148          *                              -- requested page size from client
2149          *                              -- result set size estimate from server
2150          *              cookie  OCTET STRING
2151          * }
2152          */
2153         ber = ber_init( &c[0]->ldctl_value );
2154         if ( ber == NULL ) {
2155                 rs->sr_text = "internal error";
2156                 return LDAP_OTHER;
2157         }
2158
2159         tag = ber_scanf( ber, "{im}", &size, &cookie );
2160
2161         /* Tested by frontend */
2162         assert( tag != LBER_ERROR );
2163         assert( size >= 0 );
2164
2165         /* cookie decoding/checks deferred to backend... */
2166         if ( cookie.bv_len ) {
2167                 PagedResultsCookie reqcookie;
2168                 if( cookie.bv_len != sizeof( reqcookie ) ) {
2169                         /* bad cookie */
2170                         rs->sr_text = "paged results cookie is invalid";
2171                         rc = LDAP_PROTOCOL_ERROR;
2172                         goto done;
2173                 }
2174
2175                 AC_MEMCPY( &reqcookie, cookie.bv_val, sizeof( reqcookie ));
2176
2177                 if ( reqcookie > ps->ps_cookie ) {
2178                         /* bad cookie */
2179                         rs->sr_text = "paged results cookie is invalid";
2180                         rc = LDAP_PROTOCOL_ERROR;
2181                         goto done;
2182
2183                 } else if ( reqcookie < ps->ps_cookie ) {
2184                         rs->sr_text = "paged results cookie is invalid or old";
2185                         rc = LDAP_UNWILLING_TO_PERFORM;
2186                         goto done;
2187                 }
2188
2189         } else {
2190                 /* Initial request.  Initialize state. */
2191 #if 0
2192                 if ( op->o_conn->c_pagedresults_state.ps_cookie != 0 ) {
2193                         /* There's another pagedResults control on the
2194                          * same connection; reject new pagedResults controls
2195                          * (allowed by RFC2696) */
2196                         rs->sr_text = "paged results cookie unavailable; try later";
2197                         rc = LDAP_UNWILLING_TO_PERFORM;
2198                         goto done;
2199                 }
2200 #endif
2201                 ps->ps_cookie = 0;
2202                 ps->ps_count = 0;
2203         }
2204
2205 done:;
2206         (void)ber_free( ber, 1 );
2207
2208         return rc;
2209 }
2210
2211 static void
2212 send_paged_response(
2213         Operation       *op,
2214         SlapReply       *rs,
2215         ID              *lastid,
2216         int             tentries )
2217 {
2218         LDAPControl     ctrl, *ctrls[2];
2219         BerElementBuffer berbuf;
2220         BerElement      *ber = (BerElement *)&berbuf;
2221         PagedResultsCookie respcookie;
2222         struct berval cookie;
2223
2224         Debug(LDAP_DEBUG_ARGS,
2225                 "send_paged_response: lastid=0x%08lx nentries=%d\n",
2226                 lastid ? *lastid : 0, rs->sr_nentries, NULL );
2227
2228         BER_BVZERO( &ctrl.ldctl_value );
2229         ctrls[0] = &ctrl;
2230         ctrls[1] = NULL;
2231
2232         ber_init2( ber, NULL, LBER_USE_DER );
2233
2234         if ( lastid ) {
2235                 respcookie = ( PagedResultsCookie )(*lastid);
2236                 cookie.bv_len = sizeof( respcookie );
2237                 cookie.bv_val = (char *)&respcookie;
2238
2239         } else {
2240                 respcookie = ( PagedResultsCookie )0;
2241                 BER_BVSTR( &cookie, "" );
2242         }
2243
2244         op->o_conn->c_pagedresults_state.ps_cookie = respcookie;
2245         op->o_conn->c_pagedresults_state.ps_count =
2246                 ((PagedResultsState *)op->o_pagedresults_state)->ps_count + rs->sr_nentries;
2247
2248         /* return size of 0 -- no estimate */
2249         ber_printf( ber, "{iO}", 0, &cookie );
2250
2251         if ( ber_flatten2( ber, &ctrls[0]->ldctl_value, 0 ) == -1 ) {
2252                 goto done;
2253         }
2254
2255         ctrls[0]->ldctl_oid = LDAP_CONTROL_PAGEDRESULTS;
2256         ctrls[0]->ldctl_iscritical = 0;
2257
2258         rs->sr_ctrls = ctrls;
2259         rs->sr_err = LDAP_SUCCESS;
2260         send_ldap_result( op, rs );
2261         rs->sr_ctrls = NULL;
2262
2263 done:
2264         (void) ber_free_buf( ber );
2265 }
2266
2267 static int
2268 bdb_pfid_cmp( const void *v_id1, const void *v_id2 )
2269 {
2270     const ID *p1 = v_id1, *p2 = v_id2;
2271         return *p1 - *p2;
2272 }
2273
2274 static ID*
2275 bdb_id_dup( Operation *op, ID *id )
2276 {
2277         ID *new;
2278         new = ch_malloc( sizeof(ID) );
2279         *new = *id;
2280         return new;
2281 }