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

   1 /* search.c - ldbm backend search function */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-1999 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
  12 #include <ac/string.h>
  13 #include <ac/socket.h>
  14
  15 #include "slap.h"
  16 #include "back-ldbm.h"
  17 #include "proto-back-ldbm.h"
  18
  19 static ID_BLOCK *base_candidate(
  20         Backend *be, Entry *e );
  21
  22 static ID_BLOCK *search_candidates(
  23         Backend *be, Entry *e, Filter *filter,
  24         int scope, int deref, int manageDSAit );
  25
  26
  27 int
  28 ldbm_back_search(
  29     Backend     *be,
  30     Connection  *conn,
  31     Operation   *op,
  32     char        *base,
  33     int         scope,
  34     int         deref,
  35     int         slimit,
  36     int         tlimit,
  37     Filter      *filter,
  38     char        *filterstr,
  39     char        **attrs,
  40     int         attrsonly
  41 )
  42 {
  43         struct ldbminfo *li = (struct ldbminfo *) be->be_private;
  44         int             rc, err;
  45         char *text;
  46         time_t          stoptime;
  47         ID_BLOCK                *candidates;
  48         ID              id, cursor;
  49         Entry           *e;
  50         struct berval **v2refs = NULL;
  51         Entry   *matched = NULL;
  52         char    *realbase = NULL;
  53         int             nentries = 0;
  54         int             manageDSAit = get_manageDSAit( op );
  55
  56         Debug(LDAP_DEBUG_TRACE, "=> ldbm_back_search\n", 0, 0, 0);
  57
  58         /* get entry with reader lock */
  59         if ( deref & LDAP_DEREF_FINDING ) {
  60                 e = deref_dn_r( be, base, &err, &matched, &text );
  61
  62         } else {
  63                 e = dn2entry_r( be, base, &matched );
  64                 err = e != NULL ? LDAP_SUCCESS : LDAP_REFERRAL;
  65                 text = NULL;
  66         }
  67
  68         if ( e == NULL ) {
  69                 char *matched_dn = NULL;
  70                 struct berval **refs = NULL;
  71
  72                 if ( matched != NULL ) {
  73                         matched_dn = ch_strdup( matched->e_dn );
  74
  75                         refs = is_entry_referral( matched )
  76                                 ? get_entry_referrals( be, conn, op, matched )
  77                                 : NULL;
  78
  79                         cache_return_entry_r( &li->li_cache, matched );
  80                 } else {
  81                         refs = default_referral;
  82                 }
  83
  84                 send_ldap_result( conn, op, err,
  85                         matched_dn, text, refs, NULL );
  86
  87                 if( matched != NULL ) {
  88                         ber_bvecfree( refs );
  89                         free( matched_dn );
  90                 }
  91
  92                 return 1;
  93         }
  94
  95         if (!manageDSAit && is_entry_referral( e ) ) {
  96                 /* entry is a referral, don't allow add */
  97                 char *matched_dn = ch_strdup( e->e_dn );
  98                 struct berval **refs = get_entry_referrals( be,
  99                         conn, op, e );
 100
 101                 cache_return_entry_r( &li->li_cache, e );
 102
 103                 Debug( LDAP_DEBUG_TRACE, "entry is referral\n", 0,
 104                     0, 0 );
 105
 106                 send_ldap_result( conn, op, LDAP_REFERRAL,
 107                     matched_dn, NULL, refs, NULL );
 108
 109                 ber_bvecfree( refs );
 110                 free( matched_dn );
 111
 112                 return 1;
 113         }
 114
 115         if ( tlimit == 0 && be_isroot( be, op->o_ndn ) ) {
 116                 tlimit = -1;    /* allow root to set no limit */
 117         } else {
 118                 tlimit = (tlimit > be->be_timelimit || tlimit < 1) ?
 119                     be->be_timelimit : tlimit;
 120                 stoptime = op->o_time + tlimit;
 121         }
 122
 123         if ( slimit == 0 && be_isroot( be, op->o_ndn ) ) {
 124                 slimit = -1;    /* allow root to set no limit */
 125         } else {
 126                 slimit = (slimit > be->be_sizelimit || slimit < 1) ?
 127                     be->be_sizelimit : slimit;
 128         }
 129
 130         if ( scope == LDAP_SCOPE_BASE) {
 131                 candidates = base_candidate( be, e );
 132
 133         } else {
 134                 candidates = search_candidates( be, e, filter,
 135                     scope, deref, manageDSAit );
 136         }
 137
 138         /* need normalized dn below */
 139         realbase = ch_strdup( e->e_ndn );
 140         cache_return_entry_r( &li->li_cache, e );
 141
 142         if ( candidates == NULL ) {
 143                 /* no candidates */
 144                 Debug( LDAP_DEBUG_TRACE, "no candidates\n", 0,
 145                     0, 0 );
 146
 147                 send_search_result( conn, op,
 148                         LDAP_SUCCESS,
 149                         NULL, NULL, NULL, NULL, 0 );
 150
 151                 rc = 1;
 152                 goto done;
 153         }
 154
 155         for ( id = idl_firstid( candidates, &cursor ); id != NOID;
 156             id = idl_nextid( candidates, &cursor ) )
 157         {
 158                 int             scopeok = 0;
 159
 160                 /* check for abandon */
 161                 ldap_pvt_thread_mutex_lock( &op->o_abandonmutex );
 162
 163                 if ( op->o_abandon ) {
 164                         ldap_pvt_thread_mutex_unlock( &op->o_abandonmutex );
 165                         rc = 0;
 166                         goto done;
 167                 }
 168
 169                 ldap_pvt_thread_mutex_unlock( &op->o_abandonmutex );
 170
 171                 /* check time limit */
 172                 if ( tlimit != -1 && slap_get_time() > stoptime ) {
 173                         send_search_result( conn, op, LDAP_TIMELIMIT_EXCEEDED,
 174                                 NULL, NULL, v2refs, NULL, nentries );
 175                         rc = 0;
 176                         goto done;
 177                 }
 178
 179                 /* get the entry with reader lock */
 180                 e = id2entry_r( be, id );
 181
 182                 if ( e == NULL ) {
 183                         Debug( LDAP_DEBUG_ARGS, "search: candidate %ld not found\n",
 184                                 id, 0, 0 );
 185
 186                         goto loop_continue;
 187                 }
 188
 189                 if ( deref & LDAP_DEREF_SEARCHING && is_entry_alias( e ) ) {
 190                         Entry *matched;
 191                         int err;
 192                         char *text;
 193
 194                         e = deref_entry_r( be, e, &err, &matched, &text );
 195
 196                         if( e == NULL ) {
 197                                 e = matched;
 198                                 goto loop_continue;
 199                         }
 200
 201                         if( e->e_id == id ) {
 202                                 /* circular loop */
 203                                 goto loop_continue;
 204                         }
 205
 206                         /* need to skip alias which deref into scope */
 207                         if( scope & LDAP_SCOPE_ONELEVEL ) {
 208                                 char *pdn = dn_parent( NULL, e->e_ndn );
 209                                 if ( pdn != NULL ) {
 210                                         if( strcmp( pdn, realbase ) ) {
 211                                                 free( pdn );
 212                                                 goto loop_continue;
 213                                         }
 214                                         free(pdn);
 215                                 }
 216
 217                         } else if ( dn_issuffix( e->e_ndn, realbase ) ) {
 218                                 /* alias is within scope */
 219                                 Debug( LDAP_DEBUG_ARGS, "search: \"%s\" in subtree\n",
 220                                         e->e_dn, 0, 0 );
 221                                 goto loop_continue;
 222                         }
 223
 224                         scopeok = 1;
 225                 }
 226
 227                 /*
 228                  * if it's a referral, add it to the list of referrals. only do
 229                  * this for non-base searches, and don't check the filter
 230                  * explicitly here since it's only a candidate anyway.
 231                  */
 232                 if ( !manageDSAit && scope != LDAP_SCOPE_BASE &&
 233                         is_entry_referral( e ) )
 234                 {
 235                         struct berval **refs = get_entry_referrals(
 236                                 be, conn, op, e );
 237
 238                         send_search_reference( be, conn, op,
 239                                 e, refs, scope, NULL, &v2refs );
 240
 241                         ber_bvecfree( refs );
 242
 243                         goto loop_continue;
 244                 }
 245
 246                 /* if it matches the filter and scope, send it */
 247                 if ( test_filter( be, conn, op, e, filter ) == 0 ) {
 248                         char    *dn;
 249
 250                         /* check scope */
 251                         if ( !scopeok && scope == LDAP_SCOPE_ONELEVEL ) {
 252                                 if ( (dn = dn_parent( be, e->e_ndn )) != NULL ) {
 253                                         (void) dn_normalize_case( dn );
 254                                         scopeok = (dn == realbase)
 255                                                 ? 1
 256                                                 : (strcmp( dn, realbase ) ? 0 : 1 );
 257                                         free( dn );
 258
 259                                 } else {
 260                                         scopeok = (realbase == NULL || *realbase == '\0');
 261                                 }
 262
 263                         } else if ( !scopeok && scope == LDAP_SCOPE_SUBTREE ) {
 264                                 dn = ch_strdup( e->e_ndn );
 265                                 scopeok = dn_issuffix( dn, realbase );
 266                                 free( dn );
 267
 268                         } else {
 269                                 scopeok = 1;
 270                         }
 271
 272                         if ( scopeok ) {
 273                                 /* check size limit */
 274                                 if ( --slimit == -1 ) {
 275                                         cache_return_entry_r( &li->li_cache, e );
 276                                         send_search_result( conn, op,
 277                                                 LDAP_SIZELIMIT_EXCEEDED, NULL, NULL,
 278                                                 v2refs, NULL, nentries );
 279                                         rc = 0;
 280                                         goto done;
 281                                 }
 282
 283                                 if (e) {
 284                                         switch ( send_search_entry( be, conn, op, e,
 285                                                 attrs, attrsonly, NULL ) ) {
 286                                         case 0:         /* entry sent ok */
 287                                                 nentries++;
 288                                                 break;
 289                                         case 1:         /* entry not sent */
 290                                                 break;
 291                                         case -1:        /* connection closed */
 292                                                 cache_return_entry_r( &li->li_cache, e );
 293                                                 rc = 0;
 294                                                 goto done;
 295                                         }
 296                                 }
 297                         } else {
 298                                 Debug( LDAP_DEBUG_TRACE, "candidate %ld scope not okay\n",
 299                                         id, 0, 0 );
 300                         }
 301                 } else {
 302                         Debug( LDAP_DEBUG_TRACE, "candidate %ld does match filter\n",
 303                                 id, 0, 0 );
 304                 }
 305
 306 loop_continue:
 307                 if( e != NULL ) {
 308                         /* free reader lock */
 309                         cache_return_entry_r( &li->li_cache, e );
 310                 }
 311
 312                 ldap_pvt_thread_yield();
 313         }
 314         send_search_result( conn, op,
 315                 v2refs == NULL ? LDAP_SUCCESS : LDAP_REFERRAL,
 316                 NULL, NULL, v2refs, NULL, nentries );
 317
 318         rc = 0;
 319
 320 done:
 321         if( candidates != NULL )
 322                 idl_free( candidates );
 323
 324         ber_bvecfree( v2refs );
 325         if( realbase ) free( realbase );
 326
 327         return rc;
 328 }
 329
 330 static ID_BLOCK *
 331 base_candidate(
 332     Backend     *be,
 333         Entry   *e
 334 )
 335 {
 336         ID_BLOCK                *idl;
 337
 338         Debug(LDAP_DEBUG_TRACE, "base_candidates: base: \"%s\"\n",
 339                 e->e_dn, 0, 0);
 340
 341         idl = idl_alloc( 1 );
 342         idl_insert( &idl, e->e_id, 1 );
 343
 344         return( idl );
 345 }
 346
 347 static ID_BLOCK *
 348 search_candidates(
 349     Backend     *be,
 350     Entry       *e,
 351     Filter      *filter,
 352     int         scope,
 353         int             deref,
 354         int             manageDSAit
 355 )
 356 {
 357         ID_BLOCK                *candidates;
 358         Filter          *f, *rf, *af, *lf;
 359
 360         Debug(LDAP_DEBUG_TRACE, "search_candidates: base=\"%s\" s=%d d=%d\n",
 361                 e->e_ndn, scope, deref );
 362
 363         f = NULL;
 364
 365         if( !manageDSAit ) {
 366                 /* match referrals */
 367                 rf = (Filter *) ch_malloc( sizeof(Filter) );
 368                 rf->f_next = NULL;
 369                 rf->f_choice = LDAP_FILTER_OR;
 370                 rf->f_or = (Filter *) ch_malloc( sizeof(Filter) );
 371                 rf->f_or->f_choice = LDAP_FILTER_EQUALITY;
 372                 rf->f_or->f_avtype = ch_strdup( "objectclass" );
 373                 rf->f_or->f_avvalue.bv_val = ch_strdup( "REFERRAL" );
 374                 rf->f_or->f_avvalue.bv_len = sizeof("REFERRAL")-1;
 375                 rf->f_or->f_next = filter;
 376                 f = rf;
 377         } else {
 378                 rf = NULL;
 379                 f = filter;
 380         }
 381
 382         if( deref & LDAP_DEREF_SEARCHING ) {
 383                 /* match aliases */
 384                 af = (Filter *) ch_malloc( sizeof(Filter) );
 385                 af->f_next = NULL;
 386                 af->f_choice = LDAP_FILTER_OR;
 387                 af->f_or = (Filter *) ch_malloc( sizeof(Filter) );
 388                 af->f_or->f_choice = LDAP_FILTER_EQUALITY;
 389                 af->f_or->f_avtype = ch_strdup( "objectclass" );
 390                 af->f_or->f_avvalue.bv_val = ch_strdup( "ALIAS" );
 391                 af->f_or->f_avvalue.bv_len = sizeof("ALIAS")-1;
 392                 af->f_or->f_next = f;
 393                 f = af;
 394         } else {
 395                 af = NULL;
 396         }
 397
 398         if ( scope == LDAP_SCOPE_SUBTREE ) {
 399                 lf = (Filter *) ch_malloc( sizeof(Filter) );
 400                 lf->f_next = NULL;
 401                 lf->f_choice = LDAP_FILTER_AND;
 402                 lf->f_and = (Filter *) ch_malloc( sizeof(Filter) );
 403
 404                 lf->f_and->f_choice = SLAPD_FILTER_DN_SUBTREE;
 405                 lf->f_and->f_dn = e->e_ndn;
 406
 407                 lf->f_and->f_next = f;
 408                 f = lf;
 409
 410         } else if ( scope == LDAP_SCOPE_ONELEVEL ) {
 411                 lf = (Filter *) ch_malloc( sizeof(Filter) );
 412                 lf->f_next = NULL;
 413                 lf->f_choice = LDAP_FILTER_AND;
 414                 lf->f_and = (Filter *) ch_malloc( sizeof(Filter) );
 415
 416                 lf->f_and->f_choice = SLAPD_FILTER_DN_ONE;
 417                 lf->f_and->f_dn = e->e_ndn;
 418
 419                 lf->f_and->f_next = f;
 420                 f = lf;
 421
 422         } else {
 423                 lf = NULL;
 424         }
 425
 426         candidates = filter_candidates( be, f );
 427
 428         /* free up filter additions we allocated above */
 429         if( lf != NULL ) {
 430                 free( lf->f_and );
 431                 free( lf );
 432         }
 433
 434         if( af != NULL ) {
 435                 af->f_or->f_next = NULL;
 436                 filter_free( af );
 437         }
 438
 439         if( rf != NULL ) {
 440                 rf->f_or->f_next = NULL;
 441                 filter_free( rf );
 442         }
 443
 444         return( candidates );
 445 }