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

   1 /* search.c - search operation */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7
   8 #include "portable.h"
   9
  10 #include <stdio.h>
  11 #include <ac/string.h>
  12
  13 #include "back-bdb.h"
  14 #include "idl.h"
  15 #include "external.h"
  16
  17 static int base_candidate(
  18         BackendDB       *be,
  19         Entry   *e,
  20         ID              *ids );
  21 static int search_candidates(
  22         BackendDB *be,
  23         Entry *e,
  24         Filter *filter,
  25         int scope,
  26         int deref,
  27         int manageDSAit,
  28         ID      *ids );
  29
  30 int
  31 bdb_search(
  32         BackendDB       *be,
  33         Connection      *conn,
  34         Operation       *op,
  35         const char      *base,
  36         const char      *nbase,
  37         int             scope,
  38         int             deref,
  39         int             slimit,
  40         int             tlimit,
  41         Filter  *filter,
  42         const char      *filterstr,
  43         char    **attrs,
  44         int             attrsonly )
  45 {
  46         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
  47         int              abandon;
  48         int             rc;
  49         const char *text = NULL;
  50         time_t          stoptime;
  51         ID              id, cursor;
  52         ID              candidates[BDB_IDL_SIZE];
  53         Entry           *e = NULL;
  54         struct berval **v2refs = NULL;
  55         Entry   *matched = NULL;
  56         char    *realbase = NULL;
  57         int             nentries = 0;
  58         int             manageDSAit;
  59
  60         struct slap_limits_set *limit = NULL;
  61         int isroot = 0;
  62
  63         Debug( LDAP_DEBUG_TRACE, "=> bdb_back_search\n",
  64                 0, 0, 0);
  65
  66         manageDSAit = get_manageDSAit( op );
  67
  68 #ifdef BDB_ALIASES
  69         /* get entry with reader lock */
  70         if ( deref & LDAP_DEREF_FINDING ) {
  71                 e = deref_dn_r( be, nbase, &err, &matched, &text );
  72
  73         } else
  74 #endif
  75         {
  76                 rc = bdb_dn2entry( be, NULL, nbase, &e, &matched, 0 );
  77         }
  78
  79         switch(rc) {
  80         case DB_NOTFOUND:
  81         case 0:
  82                 break;
  83         default:
  84                 send_ldap_result( conn, op, rc=LDAP_OTHER,
  85                         NULL, "internal error", NULL, NULL );
  86                 return rc;
  87         }
  88
  89         if ( e == NULL ) {
  90                 char *matched_dn = NULL;
  91                 struct berval **refs = NULL;
  92
  93                 if ( matched != NULL ) {
  94                         matched_dn = ch_strdup( matched->e_dn );
  95
  96                         refs = is_entry_referral( matched )
  97                                 ? get_entry_referrals( be, conn, op, matched )
  98                                 : NULL;
  99
 100                 } else {
 101                         refs = default_referral;
 102                 }
 103
 104                 send_ldap_result( conn, op,     rc=LDAP_REFERRAL ,
 105                         matched_dn, text, refs, NULL );
 106
 107                 if( matched != NULL ) {
 108                         ber_bvecfree( refs );
 109                         free( matched_dn );
 110                         bdb_entry_return( be, matched );
 111                         matched = NULL;
 112                 }
 113
 114                 return rc;
 115         }
 116
 117         if (!manageDSAit && is_entry_referral( e ) ) {
 118                 /* entry is a referral, don't allow add */
 119                 char *matched_dn = ch_strdup( e->e_dn );
 120                 struct berval **refs = get_entry_referrals( be,
 121                         conn, op, e );
 122
 123                 bdb_entry_return( be, e );
 124                 e = NULL;
 125
 126                 Debug( LDAP_DEBUG_TRACE, "bdb_search: entry is referral\n",
 127                         0, 0, 0 );
 128
 129                 send_ldap_result( conn, op, LDAP_REFERRAL,
 130                         matched_dn, NULL, refs, NULL );
 131
 132                 ber_bvecfree( refs );
 133                 free( matched_dn );
 134
 135                 return 1;
 136         }
 137
 138         /* if not root, get appropriate limits */
 139         if ( be_isroot( be, op->o_ndn ) ) {
 140                 isroot = 1;
 141         } else {
 142                 ( void ) get_limits( be, op->o_ndn, &limit );
 143         }
 144
 145         /* The time/size limits come first because they require very little
 146          * effort, so there's no chance the candidates are selected and then
 147          * the request is not honored only because of time/size constraints */
 148
 149         /* if no time limit requested, use soft limit (unless root!) */
 150         if ( tlimit <= 0 ) {
 151                 if ( isroot ) {
 152                         tlimit = -1;        /* allow root to set no limit */
 153                 } else {
 154                         tlimit = limit->lms_t_soft;
 155                 }
 156
 157         /* if requested limit higher than hard limit, abort */
 158         } else if ( tlimit > limit->lms_t_hard ) {
 159                 /* no hard limit means use soft instead */
 160                 if ( limit->lms_t_hard == 0 ) {
 161                         tlimit = limit->lms_t_soft;
 162
 163                 /* positive hard limit means abort */
 164                 } else if ( limit->lms_t_hard > 0 ) {
 165                         send_search_result( conn, op,
 166                                         LDAP_UNWILLING_TO_PERFORM,
 167                                         NULL, NULL, NULL, NULL, 0 );
 168                         rc = 0;
 169                         goto done;
 170                 }
 171
 172                 /* negative hard limit means no limit */
 173         }
 174
 175         /* compute it anyway; root does not use it */
 176         stoptime = op->o_time + tlimit;
 177
 178         /* if no size limit requested, use soft limit (unless root!) */
 179         if ( slimit == 0 ) {
 180                 if ( isroot ) {
 181                         slimit = -1;        /* allow root to set no limit */
 182                 } else {
 183                         slimit = limit->lms_s_soft;
 184                 }
 185
 186         /* if requested limit higher than hard limit, abort */
 187         } else if ( slimit > limit->lms_s_hard ) {
 188                 /* no hard limit means use soft instead */
 189                 if ( limit->lms_s_hard == 0 ) {
 190                         slimit = limit->lms_s_soft;
 191
 192                 /* positive hard limit means abort */
 193                 } else if ( limit->lms_s_hard > 0 ) {
 194                         send_search_result( conn, op,
 195                                         LDAP_UNWILLING_TO_PERFORM,
 196                                         NULL, NULL, NULL, NULL, 0 );
 197                         rc = 0;
 198                         goto done;
 199                 }
 200
 201                 /* negative hard limit means no limit */
 202         }
 203
 204         /* select candidates */
 205         if ( scope == LDAP_SCOPE_BASE ) {
 206                 rc = base_candidate( be, e, candidates );
 207
 208         } else {
 209                 rc = search_candidates( be, e, filter,
 210                         scope, deref, manageDSAit, candidates );
 211         }
 212
 213         /* need normalized dn below */
 214         realbase = ch_strdup( e->e_ndn );
 215
 216         /* start cursor at base entry's id */
 217         cursor = e->e_id;
 218
 219         bdb_entry_return( be, e );
 220         e = NULL;
 221
 222         if ( candidates[0] == 0 ) {
 223                 Debug( LDAP_DEBUG_TRACE, "bdb_search: no candidates\n",
 224                         0, 0, 0 );
 225
 226                 send_search_result( conn, op,
 227                         LDAP_SUCCESS,
 228                         NULL, NULL, NULL, NULL, 0 );
 229
 230                 rc = 1;
 231                 goto done;
 232         }
 233
 234         /* if not root and candidates exceed to-be-checked entries, abort */
 235         if ( !isroot && limit->lms_s_unchecked != -1 ) {
 236                 unsigned long n =
 237                         1 + (BDB_IDL_IS_RANGE( candidates ) ? candidates[ 2 ] :
 238                                 candidates[ candidates[ 0 ] ])-candidates[ 1 ];
 239
 240                 if ( n > limit->lms_s_unchecked ) {
 241                         send_search_result( conn, op,
 242                                         LDAP_UNWILLING_TO_PERFORM,
 243                                         NULL, NULL, NULL, NULL, 0 );
 244                         rc = 1;
 245                         goto done;
 246                 }
 247         }
 248
 249         for ( id = bdb_idl_first( candidates, &cursor );
 250                 id != NOID;
 251                 id = bdb_idl_next( candidates, &cursor ) )
 252         {
 253                 int             scopeok = 0;
 254
 255                 /* check for abandon */
 256                 ldap_pvt_thread_mutex_lock( &op->o_abandonmutex );
 257                 abandon = op->o_abandon;
 258                 ldap_pvt_thread_mutex_unlock( &op->o_abandonmutex );
 259
 260                 if ( abandon ) {
 261                         rc = 0;
 262                         goto done;
 263                 }
 264
 265                 /* check time limit */
 266                 if ( tlimit != -1 && slap_get_time() > stoptime ) {
 267                         send_search_result( conn, op, rc = LDAP_TIMELIMIT_EXCEEDED,
 268                                 NULL, NULL, v2refs, NULL, nentries );
 269                         goto done;
 270                 }
 271
 272                 /* get the entry with reader lock */
 273                 rc = bdb_id2entry( be, NULL, id, &e );
 274
 275                 if ( e == NULL ) {
 276                         if( !BDB_IDL_IS_RANGE(candidates) ) {
 277                                 /* only complain for non-range IDLs */
 278                                 Debug( LDAP_DEBUG_TRACE,
 279                                         "bdb_search: candidate %ld not found\n",
 280                                         id, 0, 0 );
 281                         }
 282
 283                         goto loop_continue;
 284                 }
 285
 286 #ifdef BDB_ALIASES
 287                 if ( deref & LDAP_DEREF_SEARCHING && is_entry_alias( e ) ) {
 288                         Entry *matched;
 289                         int err;
 290                         const char *text;
 291
 292                         e = deref_entry_r( be, e, &err, &matched, &text );
 293
 294                         if( e == NULL ) {
 295                                 e = matched;
 296                                 goto loop_continue;
 297                         }
 298
 299                         if( e->e_id == id ) {
 300                                 /* circular loop */
 301                                 goto loop_continue;
 302                         }
 303
 304                         /* need to skip alias which deref into scope */
 305                         if( scope & LDAP_SCOPE_ONELEVEL ) {
 306                                 char *pdn = dn_parent( NULL, e->e_ndn );
 307                                 if ( pdn != NULL ) {
 308                                         if( strcmp( pdn, realbase ) ) {
 309                                                 free( pdn );
 310                                                 goto loop_continue;
 311                                         }
 312                                         free(pdn);
 313                                 }
 314
 315                         } else if ( dn_issuffix( e->e_ndn, realbase ) ) {
 316                                 /* alias is within scope */
 317                                 Debug( LDAP_DEBUG_TRACE,
 318                                         "bdb_search: \"%s\" in subtree\n",
 319                                         e->e_dn, 0, 0 );
 320                                 goto loop_continue;
 321                         }
 322
 323                         scopeok = 1;
 324                 }
 325 #endif
 326
 327                 /*
 328                  * if it's a referral, add it to the list of referrals. only do
 329                  * this for non-base searches, and don't check the filter
 330                  * explicitly here since it's only a candidate anyway.
 331                  */
 332                 if ( !manageDSAit && scope != LDAP_SCOPE_BASE &&
 333                         is_entry_referral( e ) )
 334                 {
 335                         struct berval **refs = get_entry_referrals(
 336                                 be, conn, op, e );
 337
 338                         send_search_reference( be, conn, op,
 339                                 e, refs, scope, NULL, &v2refs );
 340
 341                         ber_bvecfree( refs );
 342
 343                         goto loop_continue;
 344                 }
 345
 346                 /* if it matches the filter and scope, send it */
 347                 rc = test_filter( be, conn, op, e, filter );
 348                 if ( rc == LDAP_COMPARE_TRUE ) {
 349                         char    *dn;
 350
 351                         /* check scope */
 352                         if ( !scopeok && scope == LDAP_SCOPE_ONELEVEL ) {
 353                                 if ( (dn = dn_parent( be, e->e_ndn )) != NULL ) {
 354                                         (void) dn_normalize( dn );
 355                                         scopeok = (dn == realbase)
 356                                                 ? 1
 357                                                 : (strcmp( dn, realbase ) ? 0 : 1 );
 358                                         free( dn );
 359
 360                                 } else {
 361                                         scopeok = (realbase == NULL || *realbase == '\0');
 362                                 }
 363
 364                         } else if ( !scopeok && scope == LDAP_SCOPE_SUBTREE ) {
 365                                 dn = ch_strdup( e->e_ndn );
 366                                 scopeok = dn_issuffix( dn, realbase );
 367                                 free( dn );
 368
 369                         } else {
 370                                 scopeok = 1;
 371                         }
 372
 373                         if ( scopeok ) {
 374                                 /* check size limit */
 375                                 if ( --slimit == -1 ) {
 376                                         bdb_entry_return( be, e );
 377                                         e = NULL;
 378                                         send_search_result( conn, op,
 379                                                 rc = LDAP_SIZELIMIT_EXCEEDED, NULL, NULL,
 380                                                 v2refs, NULL, nentries );
 381                                         goto done;
 382                                 }
 383
 384                                 if (e) {
 385                                         int result = send_search_entry( be, conn, op,
 386                                                 e, attrs, attrsonly, NULL);
 387
 388                                         switch (result) {
 389                                         case 0:         /* entry sent ok */
 390                                                 nentries++;
 391                                                 break;
 392                                         case 1:         /* entry not sent */
 393                                                 break;
 394                                         case -1:        /* connection closed */
 395                                                 bdb_entry_return( be, e );
 396                                                 e = NULL;
 397                                                 rc = LDAP_OTHER;
 398                                                 goto done;
 399                                         }
 400                                 }
 401                         } else {
 402                                 Debug( LDAP_DEBUG_TRACE,
 403                                         "bdb_search: %ld scope not okay\n",
 404                                         id, 0, 0 );
 405                         }
 406                 } else {
 407                         Debug( LDAP_DEBUG_TRACE,
 408                                 "bdb_search: %ld does match filter\n",
 409                                 id, 0, 0 );
 410                 }
 411
 412 loop_continue:
 413                 if( e != NULL ) {
 414                         /* free reader lock */
 415                         bdb_entry_return( be, e );
 416                 }
 417
 418                 ldap_pvt_thread_yield();
 419         }
 420         send_search_result( conn, op,
 421                 v2refs == NULL ? LDAP_SUCCESS : LDAP_REFERRAL,
 422                 NULL, NULL, v2refs, NULL, nentries );
 423
 424         rc = 0;
 425
 426 done:
 427         ber_bvecfree( v2refs );
 428         if( realbase ) ch_free( realbase );
 429
 430         return rc;
 431 }
 432
 433
 434 static int base_candidate(
 435         BackendDB       *be,
 436         Entry   *e,
 437         ID              *ids )
 438 {
 439         Debug(LDAP_DEBUG_ARGS, "base_candidates: base: \"%s\" (0x%08lx)\n",
 440                 e->e_dn, (long) e->e_id, 0);
 441
 442         ids[0] = 1;
 443         ids[1] = e->e_id;
 444         return 0;
 445 }
 446
 447 static int search_candidates(
 448         BackendDB *be,
 449         Entry *e,
 450         Filter *filter,
 451         int scope,
 452         int deref,
 453         int manageDSAit,
 454         ID      *ids )
 455 {
 456         int rc;
 457         Filter          f, fand, rf, xf;
 458         AttributeAssertion aa_ref;
 459         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
 460 #ifdef BDB_ALIASES
 461         Filter  af;
 462         AttributeAssertion aa_alias;
 463 #endif
 464
 465         Debug(LDAP_DEBUG_TRACE,
 466                 "search_candidates: base=\"%s\" (0x%08lx) scope=%d\n",
 467                 e->e_dn, (long) e->e_id, scope );
 468
 469         xf.f_or = filter;
 470         xf.f_choice = LDAP_FILTER_OR;
 471         xf.f_next = NULL;
 472
 473         if( !manageDSAit ) {
 474                 /* match referrals */
 475                 static struct berval bv_ref = { sizeof("REFERRAL")-1, "REFERRAL" };
 476                 rf.f_choice = LDAP_FILTER_EQUALITY;
 477                 rf.f_ava = &aa_ref;
 478                 rf.f_av_desc = slap_schema.si_ad_objectClass;
 479                 rf.f_av_value = &bv_ref;
 480                 rf.f_next = xf.f_or;
 481                 xf.f_or = &rf;
 482         }
 483
 484 #ifdef BDB_ALIASES
 485         if( deref & LDAP_DEREF_SEARCHING ) {
 486                 /* match aliases */
 487                 static struct berval bv_alias = { sizeof("ALIAS")-1, "ALIAS" };
 488                 af.f_choice = LDAP_FILTER_EQUALITY;
 489                 af.f_ava = &aa_alias;
 490                 af.f_av_desc = slap_schema.si_ad_objectClass;
 491                 af.f_av_value = &bv_alias;
 492                 af.f_next = xf.f_or;
 493                 xf.f_or = &af;
 494         }
 495 #endif
 496
 497         f.f_next = NULL;
 498         f.f_choice = LDAP_FILTER_AND;
 499         f.f_and = &fand;
 500         fand.f_choice = scope == LDAP_SCOPE_SUBTREE
 501                 ? SLAPD_FILTER_DN_SUBTREE
 502                 : SLAPD_FILTER_DN_ONE;
 503         fand.f_dn = e->e_ndn;
 504         fand.f_next = xf.f_or == filter ? filter : &xf ;
 505
 506
 507 #ifdef BDB_FILTER_INDICES
 508         {
 509                 ID range[3];
 510                 BDB_IDL_ID( bdb, range, e->e_id );
 511                 rc = bdb_filter_candidates( be, range, &f, ids );
 512         }
 513 #else
 514         BDB_IDL_ID( bdb, ids, e->e_id );
 515         rc = 0;
 516 #endif
 517
 518         Debug(LDAP_DEBUG_TRACE,
 519                 "search_candidates: id=%ld first=%ld last=%ld\n",
 520                 ids[0], ids[1],
 521                 BDB_IDL_IS_RANGE( ids ) ? ids[2] : ids[ids[0]] );
 522
 523         return rc;
 524 }