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

   1 /* search.c - ldbm backend search function */
   2 /*
   3  * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 #include "portable.h"
   8
   9 #include <stdio.h>
  10
  11 #include <ac/string.h>
  12 #include <ac/socket.h>
  13
  14 #include "slap.h"
  15 #include "back-ldbm.h"
  16 #include "proto-back-ldbm.h"
  17
  18 static ID_BLOCK *base_candidate(
  19         Backend *be, Entry *e );
  20
  21 static ID_BLOCK *search_candidates(
  22         Backend *be, Entry *e, Filter *filter,
  23         int scope, int deref, int manageDSAit );
  24
  25
  26 int
  27 ldbm_back_search(
  28     Backend     *be,
  29     Connection  *conn,
  30     Operation   *op,
  31     char        *base,
  32     int         scope,
  33     int         deref,
  34     int         slimit,
  35     int         tlimit,
  36     Filter      *filter,
  37     char        *filterstr,
  38     char        **attrs,
  39     int         attrsonly
  40 )
  41 {
  42         struct ldbminfo *li = (struct ldbminfo *) be->be_private;
  43         int             rc, err;
  44         char *text;
  45         time_t          stoptime;
  46         ID_BLOCK                *candidates;
  47         ID              id, cursor;
  48         Entry           *e;
  49         struct berval **v2refs = NULL;
  50         Entry   *matched = NULL;
  51         char    *realbase = NULL;
  52         int             nentries = 0;
  53         int             manageDSAit = get_manageDSAit( op );
  54
  55         Debug(LDAP_DEBUG_TRACE, "=> ldbm_back_search\n", 0, 0, 0);
  56
  57         /* get entry with reader lock */
  58         if ( deref & LDAP_DEREF_FINDING ) {
  59                 e = deref_dn_r( be, base, &err, &matched, &text );
  60
  61         } else {
  62                 e = dn2entry_r( be, base, &matched );
  63                 err = e != NULL ? LDAP_SUCCESS : LDAP_REFERRAL;
  64                 text = NULL;
  65         }
  66
  67         if ( e == NULL ) {
  68                 char *matched_dn = NULL;
  69                 struct berval **refs = NULL;
  70
  71                 if ( matched != NULL ) {
  72                         matched_dn = ch_strdup( matched->e_dn );
  73
  74                         refs = is_entry_referral( matched )
  75                                 ? get_entry_referrals( be, conn, op, matched )
  76                                 : NULL;
  77
  78                         cache_return_entry_r( &li->li_cache, matched );
  79                 } else {
  80                         refs = default_referral;
  81                 }
  82
  83                 send_ldap_result( conn, op, err,
  84                         matched_dn, text, refs, NULL );
  85
  86                 if( matched != NULL ) {
  87                         ber_bvecfree( refs );
  88                         free( matched_dn );
  89                 }
  90
  91                 return 1;
  92         }
  93
  94         if (!manageDSAit && is_entry_referral( e ) ) {
  95                 /* entry is a referral, don't allow add */
  96                 char *matched_dn = ch_strdup( e->e_dn );
  97                 struct berval **refs = get_entry_referrals( be,
  98                         conn, op, e );
  99
 100                 cache_return_entry_r( &li->li_cache, e );
 101
 102                 Debug( LDAP_DEBUG_TRACE, "entry is referral\n", 0,
 103                     0, 0 );
 104
 105                 send_ldap_result( conn, op, LDAP_REFERRAL,
 106                     matched_dn, NULL, refs, NULL );
 107
 108                 ber_bvecfree( refs );
 109                 free( matched_dn );
 110
 111                 return 1;
 112         }
 113
 114         if ( tlimit == 0 && be_isroot( be, op->o_ndn ) ) {
 115                 tlimit = -1;    /* allow root to set no limit */
 116         } else {
 117                 tlimit = (tlimit > be->be_timelimit || tlimit < 1) ?
 118                     be->be_timelimit : tlimit;
 119                 stoptime = op->o_time + tlimit;
 120         }
 121
 122         if ( slimit == 0 && be_isroot( be, op->o_ndn ) ) {
 123                 slimit = -1;    /* allow root to set no limit */
 124         } else {
 125                 slimit = (slimit > be->be_sizelimit || slimit < 1) ?
 126                     be->be_sizelimit : slimit;
 127         }
 128
 129         if ( scope == LDAP_SCOPE_BASE) {
 130                 candidates = base_candidate( be, e );
 131
 132         } else {
 133                 candidates = search_candidates( be, e, filter,
 134                     scope, deref, manageDSAit );
 135         }
 136
 137         /* need normalized dn below */
 138         realbase = ch_strdup( e->e_ndn );
 139         cache_return_entry_r( &li->li_cache, e );
 140
 141         if ( candidates == NULL ) {
 142                 /* no candidates */
 143                 Debug( LDAP_DEBUG_TRACE, "no candidates\n", 0,
 144                     0, 0 );
 145
 146                 send_search_result( conn, op,
 147                         LDAP_SUCCESS,
 148                         NULL, NULL, NULL, NULL, 0 );
 149
 150                 rc = 1;
 151                 goto done;
 152         }
 153
 154         for ( id = idl_firstid( candidates, &cursor ); id != NOID;
 155             id = idl_nextid( candidates, &cursor ) )
 156         {
 157                 int             scopeok = 0;
 158
 159                 /* check for abandon */
 160                 ldap_pvt_thread_mutex_lock( &op->o_abandonmutex );
 161
 162                 if ( op->o_abandon ) {
 163                         ldap_pvt_thread_mutex_unlock( &op->o_abandonmutex );
 164                         rc = 0;
 165                         goto done;
 166                 }
 167
 168                 ldap_pvt_thread_mutex_unlock( &op->o_abandonmutex );
 169
 170                 /* check time limit */
 171                 if ( tlimit != -1 && slap_get_time() > stoptime ) {
 172                         send_search_result( conn, op, LDAP_TIMELIMIT_EXCEEDED,
 173                                 NULL, NULL, v2refs, NULL, nentries );
 174                         rc = 0;
 175                         goto done;
 176                 }
 177
 178                 /* get the entry with reader lock */
 179                 e = id2entry_r( be, id );
 180
 181                 if ( e == NULL ) {
 182                         Debug( LDAP_DEBUG_ARGS, "search: candidate %ld not found\n",
 183                                 id, 0, 0 );
 184
 185                         goto loop_continue;
 186                 }
 187
 188                 if ( deref & LDAP_DEREF_SEARCHING && is_entry_alias( e ) ) {
 189                         Entry *matched;
 190                         int err;
 191                         char *text;
 192
 193                         e = deref_entry_r( be, e, &err, &matched, &text );
 194
 195                         if( e == NULL ) {
 196                                 e = matched;
 197                                 goto loop_continue;
 198                         }
 199
 200                         if( e->e_id == id ) {
 201                                 /* circular loop */
 202                                 goto loop_continue;
 203                         }
 204
 205                         /* need to skip alias which deref into scope */
 206                         if( scope & LDAP_SCOPE_ONELEVEL ) {
 207                                 char *pdn = dn_parent( NULL, e->e_ndn );
 208                                 if ( pdn != NULL ) {
 209                                         if( strcmp( pdn, realbase ) ) {
 210                                                 free( pdn );
 211                                                 goto loop_continue;
 212                                         }
 213                                         free(pdn);
 214                                 }
 215
 216                         } else if ( dn_issuffix( e->e_ndn, realbase ) ) {
 217                                 /* alias is within scope */
 218                                 Debug( LDAP_DEBUG_ARGS, "search: \"%s\" in subtree\n",
 219                                         e->e_dn, 0, 0 );
 220                                 goto loop_continue;
 221                         }
 222
 223                         scopeok = 1;
 224                 }
 225
 226                 /*
 227                  * if it's a referral, add it to the list of referrals. only do
 228                  * this for non-base searches, and don't check the filter
 229                  * explicitly here since it's only a candidate anyway.
 230                  */
 231                 if ( !manageDSAit && scope != LDAP_SCOPE_BASE &&
 232                         is_entry_referral( e ) )
 233                 {
 234                         struct berval **refs = get_entry_referrals(
 235                                 be, conn, op, e );
 236
 237                         send_search_reference( be, conn, op,
 238                                 e, refs, scope, NULL, &v2refs );
 239
 240                         ber_bvecfree( refs );
 241
 242                         goto loop_continue;
 243                 }
 244
 245                 /* if it matches the filter and scope, send it */
 246                 if ( test_filter( be, conn, op, e, filter ) == 0 ) {
 247                         char    *dn;
 248
 249                         /* check scope */
 250                         if ( !scopeok && scope == LDAP_SCOPE_ONELEVEL ) {
 251                                 if ( (dn = dn_parent( be, e->e_ndn )) != NULL ) {
 252                                         (void) dn_normalize_case( dn );
 253                                         scopeok = (dn == realbase)
 254                                                 ? 1
 255                                                 : (strcmp( dn, realbase ) ? 0 : 1 );
 256                                         free( dn );
 257
 258                                 } else {
 259                                         scopeok = (realbase == NULL || *realbase == '\0');
 260                                 }
 261
 262                         } else if ( !scopeok && scope == LDAP_SCOPE_SUBTREE ) {
 263                                 dn = ch_strdup( e->e_ndn );
 264                                 scopeok = dn_issuffix( dn, realbase );
 265                                 free( dn );
 266
 267                         } else {
 268                                 scopeok = 1;
 269                         }
 270
 271                         if ( scopeok ) {
 272                                 /* check size limit */
 273                                 if ( --slimit == -1 ) {
 274                                         cache_return_entry_r( &li->li_cache, e );
 275                                         send_search_result( conn, op,
 276                                                 LDAP_SIZELIMIT_EXCEEDED, NULL, NULL,
 277                                                 v2refs, NULL, nentries );
 278                                         rc = 0;
 279                                         goto done;
 280                                 }
 281
 282                                 if (e) {
 283                                         switch ( send_search_entry( be, conn, op, e,
 284                                                 attrs, attrsonly, NULL ) ) {
 285                                         case 0:         /* entry sent ok */
 286                                                 nentries++;
 287                                                 break;
 288                                         case 1:         /* entry not sent */
 289                                                 break;
 290                                         case -1:        /* connection closed */
 291                                                 cache_return_entry_r( &li->li_cache, e );
 292                                                 rc = 0;
 293                                                 goto done;
 294                                         }
 295                                 }
 296                         } else {
 297                                 Debug( LDAP_DEBUG_TRACE, "candidate %ld scope not okay\n",
 298                                         id, 0, 0 );
 299                         }
 300                 } else {
 301                         Debug( LDAP_DEBUG_TRACE, "candidate %ld does match filter\n",
 302                                 id, 0, 0 );
 303                 }
 304
 305 loop_continue:
 306                 if( e != NULL ) {
 307                         /* free reader lock */
 308                         cache_return_entry_r( &li->li_cache, e );
 309                 }
 310
 311                 ldap_pvt_thread_yield();
 312         }
 313         send_search_result( conn, op,
 314                 v2refs == NULL ? LDAP_SUCCESS : LDAP_REFERRAL,
 315                 NULL, NULL, v2refs, NULL, nentries );
 316
 317         rc = 0;
 318
 319 done:
 320         idl_free( candidates );
 321
 322         ber_bvecfree( v2refs );
 323         if( realbase ) free( realbase );
 324
 325         return rc;
 326 }
 327
 328 static ID_BLOCK *
 329 base_candidate(
 330     Backend     *be,
 331         Entry   *e
 332 )
 333 {
 334         ID_BLOCK                *idl;
 335
 336         Debug(LDAP_DEBUG_TRACE, "base_candidates: base: \"%s\"\n",
 337                 e->e_dn, 0, 0);
 338
 339         idl = idl_alloc( 1 );
 340         idl_insert( &idl, e->e_id, 1 );
 341
 342         return( idl );
 343 }
 344
 345 static ID_BLOCK *
 346 search_candidates(
 347     Backend     *be,
 348     Entry       *e,
 349     Filter      *filter,
 350     int         scope,
 351         int             deref,
 352         int             manageDSAit
 353 )
 354 {
 355         struct ldbminfo *li = (struct ldbminfo *) be->be_private;
 356         ID_BLOCK                *candidates;
 357         Filter          *f, *rf, *af, *lf;
 358
 359         Debug(LDAP_DEBUG_TRACE, "search_candidates: base=\"%s\" s=%d d=%d\n",
 360                 e->e_ndn, scope, deref );
 361
 362         f = NULL;
 363
 364         if( !manageDSAit ) {
 365                 /* match referrals */
 366                 rf = (Filter *) ch_malloc( sizeof(Filter) );
 367                 rf->f_next = NULL;
 368                 rf->f_choice = LDAP_FILTER_OR;
 369                 rf->f_or = (Filter *) ch_malloc( sizeof(Filter) );
 370                 rf->f_or->f_choice = LDAP_FILTER_EQUALITY;
 371                 rf->f_or->f_avtype = ch_strdup( "objectclass" );
 372                 rf->f_or->f_avvalue.bv_val = ch_strdup( "REFERRAL" );
 373                 rf->f_or->f_avvalue.bv_len = sizeof("REFERRAL")-1;
 374                 rf->f_or->f_next = filter;
 375                 f = rf;
 376         } else {
 377                 rf = NULL;
 378                 f = filter;
 379         }
 380
 381         if( deref & LDAP_DEREF_SEARCHING ) {
 382                 /* match aliases */
 383                 af = (Filter *) ch_malloc( sizeof(Filter) );
 384                 af->f_next = NULL;
 385                 af->f_choice = LDAP_FILTER_OR;
 386                 af->f_or = (Filter *) ch_malloc( sizeof(Filter) );
 387                 af->f_or->f_choice = LDAP_FILTER_EQUALITY;
 388                 af->f_or->f_avtype = ch_strdup( "objectclass" );
 389                 af->f_or->f_avvalue.bv_val = ch_strdup( "ALIAS" );
 390                 af->f_or->f_avvalue.bv_len = sizeof("ALIAS")-1;
 391                 af->f_or->f_next = f;
 392                 f = af;
 393         } else {
 394                 af = NULL;
 395         }
 396
 397         if ( scope == LDAP_SCOPE_SUBTREE ) {
 398                 lf = (Filter *) ch_malloc( sizeof(Filter) );
 399                 lf->f_next = NULL;
 400                 lf->f_choice = LDAP_FILTER_AND;
 401                 lf->f_and = (Filter *) ch_malloc( sizeof(Filter) );
 402
 403                 lf->f_and->f_choice = SLAPD_FILTER_DN_SUBTREE;
 404                 lf->f_and->f_dn = e->e_ndn;
 405
 406                 lf->f_and->f_next = f;
 407                 f = lf;
 408
 409         } else if ( scope == LDAP_SCOPE_ONELEVEL ) {
 410                 lf = (Filter *) ch_malloc( sizeof(Filter) );
 411                 lf->f_next = NULL;
 412                 lf->f_choice = LDAP_FILTER_AND;
 413                 lf->f_and = (Filter *) ch_malloc( sizeof(Filter) );
 414
 415                 lf->f_and->f_choice = SLAPD_FILTER_DN_ONE;
 416                 lf->f_and->f_dn = e->e_ndn;
 417
 418                 lf->f_and->f_next = f;
 419                 f = lf;
 420
 421         } else {
 422                 lf = NULL;
 423         }
 424
 425         candidates = filter_candidates( be, f );
 426
 427         /* free up filter additions we allocated above */
 428         if( lf != NULL ) {
 429                 free( lf->f_and );
 430                 free( lf );
 431         }
 432
 433         if( af != NULL ) {
 434                 af->f_or->f_next = NULL;
 435                 filter_free( af );
 436         }
 437
 438         if( rf != NULL ) {
 439                 rf->f_or->f_next = NULL;
 440                 filter_free( rf );
 441         }
 442
 443         return( candidates );
 444 }