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

   1 /* search.c - ldap backend search function */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1999-2005 The OpenLDAP Foundation.
   6  * Portions Copyright 1999-2003 Howard Chu.
   7  * Portions Copyright 2000-2003 Pierangelo Masarati.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted only as authorized by the OpenLDAP
  12  * Public License.
  13  *
  14  * A copy of this license is available in the file LICENSE in the
  15  * top-level directory of the distribution or, alternatively, at
  16  * <http://www.OpenLDAP.org/license.html>.
  17  */
  18 /* ACKNOWLEDGEMENTS:
  19  * This work was initially developed by the Howard Chu for inclusion
  20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  21  * Masarati.
  22  */
  23
  24 #include "portable.h"
  25
  26 #include <stdio.h>
  27
  28 #include <ac/socket.h>
  29 #include <ac/string.h>
  30 #include <ac/time.h>
  31
  32 #include "slap.h"
  33 #include "back-ldap.h"
  34 #undef ldap_debug       /* silence a warning in ldap-int.h */
  35 #include "../../../libraries/libldap/ldap-int.h"
  36
  37 #include "lutil.h"
  38
  39 static int
  40 ldap_build_entry( Operation *op, LDAPMessage *e, Entry *ent,
  41          struct berval *bdn );
  42
  43 /*
  44  * Quick'n'dirty rewrite of filter in case of error, to deal with
  45  * <draft-zeilenga-ldap-t-f>.
  46  */
  47 static int
  48 ldap_back_munge_filter(
  49         Operation       *op,
  50         struct berval   *filter )
  51 {
  52         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  53
  54         char            *ptr;
  55         int             gotit = 0;
  56
  57         Debug( LDAP_DEBUG_ARGS, "=> ldap_back_munge_filter \"%s\"\n",
  58                         filter->bv_val, 0, 0 );
  59
  60         for ( ptr = strstr( filter->bv_val, "(?=" );
  61                         ptr;
  62                         ptr = strstr( ptr, "(?=" ) )
  63         {
  64                 static struct berval
  65                         bv_true = BER_BVC( "(?=true)" ),
  66                         bv_false = BER_BVC( "(?=false)" ),
  67                         bv_undefined = BER_BVC( "(?=undefined)" ),
  68                         bv_t = BER_BVC( "(&)" ),
  69                         bv_f = BER_BVC( "(|)" ),
  70                         bv_T = BER_BVC( "(objectClass=*)" ),
  71                         bv_F = BER_BVC( "(!(objectClass=*))" );
  72                 struct berval   *oldbv = NULL,
  73                                 *newbv = NULL,
  74                                 oldfilter = BER_BVNULL;
  75
  76                 if ( strncmp( ptr, bv_true.bv_val, bv_true.bv_len ) == 0 ) {
  77                         oldbv = &bv_true;
  78                         if ( li->flags & LDAP_BACK_F_SUPPORT_T_F ) {
  79                                 newbv = &bv_t;
  80
  81                         } else {
  82                                 newbv = &bv_T;
  83                         }
  84
  85                 } else if ( strncmp( ptr, bv_false.bv_val, bv_false.bv_len ) == 0 )
  86                 {
  87                         oldbv = &bv_false;
  88                         if ( li->flags & LDAP_BACK_F_SUPPORT_T_F ) {
  89                                 newbv = &bv_f;
  90
  91                         } else {
  92                                 newbv = &bv_F;
  93                         }
  94
  95                 } else if ( strncmp( ptr, bv_undefined.bv_val, bv_undefined.bv_len ) == 0 )
  96                 {
  97                         oldbv = &bv_undefined;
  98                         newbv = &bv_F;
  99
 100                 } else {
 101                         gotit = 0;
 102                         goto done;
 103                 }
 104
 105                 oldfilter = *filter;
 106                 if ( newbv->bv_len > oldbv->bv_len ) {
 107                         filter->bv_len += newbv->bv_len - oldbv->bv_len;
 108                         if ( filter->bv_val == op->ors_filterstr.bv_val ) {
 109                                 filter->bv_val = op->o_tmpalloc( filter->bv_len + 1,
 110                                                 op->o_tmpmemctx );
 111
 112                                 AC_MEMCPY( filter->bv_val, op->ors_filterstr.bv_val,
 113                                                 op->ors_filterstr.bv_len + 1 );
 114
 115                         } else {
 116                                 filter->bv_val = op->o_tmprealloc( filter->bv_val,
 117                                                 filter->bv_len + 1, op->o_tmpmemctx );
 118                         }
 119
 120                         ptr = filter->bv_val + ( ptr - oldfilter.bv_val );
 121                 }
 122
 123                 AC_MEMCPY( &ptr[ newbv->bv_len ],
 124                                 &ptr[ oldbv->bv_len ],
 125                                 oldfilter.bv_len - ( ptr - filter->bv_val ) - oldbv->bv_len + 1 );
 126                 AC_MEMCPY( ptr, newbv->bv_val, newbv->bv_len );
 127
 128                 ptr += newbv->bv_len;
 129                 gotit = 1;
 130         }
 131
 132 done:;
 133         Debug( LDAP_DEBUG_ARGS, "<= ldap_back_munge_filter \"%s\" (%d)\n",
 134                         filter->bv_val, gotit, 0 );
 135
 136         return gotit;
 137 }
 138
 139 int
 140 ldap_back_search(
 141                 Operation       *op,
 142                 SlapReply       *rs )
 143 {
 144         struct ldapconn *lc;
 145         struct timeval  tv;
 146         time_t          stoptime;
 147         LDAPMessage     *res,
 148                         *e;
 149         int             rc = 0,
 150                         msgid;
 151         struct berval   match = BER_BVNULL,
 152                         filter = BER_BVNULL;
 153         int             i;
 154         char            **attrs = NULL;
 155         int             dontfreetext = 0;
 156         int             do_retry = 1;
 157         LDAPControl     **ctrls = NULL;
 158
 159         lc = ldap_back_getconn( op, rs, LDAP_BACK_SENDERR );
 160         if ( !lc || !ldap_back_dobind( lc, op, rs, LDAP_BACK_SENDERR ) ) {
 161                 return rs->sr_err;
 162         }
 163
 164         /*
 165          * FIXME: in case of values return filter, we might want
 166          * to map attrs and maybe rewrite value
 167          */
 168
 169         /* should we check return values? */
 170         if ( op->ors_deref != -1 ) {
 171                 ldap_set_option( lc->lc_ld, LDAP_OPT_DEREF,
 172                                 (void *)&op->ors_deref );
 173         }
 174
 175         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 176                 tv.tv_sec = op->ors_tlimit;
 177                 tv.tv_usec = 0;
 178                 stoptime = op->o_time + op->ors_tlimit;
 179
 180         } else {
 181                 tv.tv_sec = 0;
 182         }
 183
 184         if ( op->ors_attrs ) {
 185                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ )
 186                         /* just count attrs */ ;
 187
 188                 attrs = ch_malloc( ( i + 1 )*sizeof( char * ) );
 189                 if ( attrs == NULL ) {
 190                         rs->sr_err = LDAP_NO_MEMORY;
 191                         rc = -1;
 192                         goto finish;
 193                 }
 194
 195                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ ) {
 196                         attrs[ i ] = op->ors_attrs[i].an_name.bv_val;
 197                 }
 198                 attrs[ i ] = NULL;
 199         }
 200
 201         ctrls = op->o_ctrls;
 202         rc = ldap_back_proxy_authz_ctrl( lc, op, rs, &ctrls );
 203         if ( rc != LDAP_SUCCESS ) {
 204                 dontfreetext = 1;
 205                 goto finish;
 206         }
 207
 208         /* deal with <draft-zeilenga-ldap-t-f> filters */
 209         filter = op->ors_filterstr;
 210 retry:
 211         rs->sr_err = ldap_search_ext( lc->lc_ld, op->o_req_ndn.bv_val,
 212                         op->ors_scope, filter.bv_val,
 213                         attrs, op->ors_attrsonly, ctrls, NULL,
 214                         tv.tv_sec ? &tv : NULL,
 215                         op->ors_slimit, &msgid );
 216
 217         if ( rs->sr_err != LDAP_SUCCESS ) {
 218 fail:;
 219                 switch ( rs->sr_err ) {
 220                 case LDAP_SERVER_DOWN:
 221                         if ( do_retry ) {
 222                                 do_retry = 0;
 223                                 if ( ldap_back_retry( lc, op, rs, LDAP_BACK_DONTSEND ) ) {
 224                                         goto retry;
 225                                 }
 226                         }
 227                         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 228                         ldap_back_freeconn( op, lc );
 229                         lc = NULL;
 230                         goto finish;
 231
 232                 case LDAP_FILTER_ERROR:
 233                         if ( ldap_back_munge_filter( op, &filter ) ) {
 234                                 goto retry;
 235                         }
 236
 237                         /* invalid filters return success with no data */
 238                         rs->sr_err = LDAP_SUCCESS;
 239                         rs->sr_text = NULL;
 240                         goto finish;
 241
 242                 default:
 243                         rs->sr_err = slap_map_api2result( rs );
 244                         rs->sr_text = NULL;
 245                         goto finish;
 246                 }
 247         }
 248
 249         /* We pull apart the ber result, stuff it into a slapd entry, and
 250          * let send_search_entry stuff it back into ber format. Slow & ugly,
 251          * but this is necessary for version matching, and for ACL processing.
 252          */
 253
 254         for ( rc = 0; rc != -1; rc = ldap_result( lc->lc_ld, msgid, 0, &tv, &res ) )
 255         {
 256                 /* check for abandon */
 257                 if ( op->o_abandon ) {
 258                         if ( rc > 0 ) {
 259                                 ldap_msgfree( res );
 260                         }
 261                         ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 262                         rc = SLAPD_ABANDON;
 263                         goto finish;
 264                 }
 265
 266                 if ( rc == 0 ) {
 267                         tv.tv_sec = 0;
 268                         tv.tv_usec = 100000;
 269                         ldap_pvt_thread_yield();
 270
 271                         /* check time limit */
 272                         if ( op->ors_tlimit != SLAP_NO_LIMIT
 273                                         && slap_get_time() > stoptime )
 274                         {
 275                                 ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 276                                 rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 277                                 goto finish;
 278                         }
 279
 280                 } else if ( rc == LDAP_RES_SEARCH_ENTRY ) {
 281                         Entry           ent = { 0 };
 282                         struct berval   bdn = BER_BVNULL;
 283                         int             abort = 0;
 284
 285                         do_retry = 0;
 286
 287                         e = ldap_first_entry( lc->lc_ld, res );
 288                         rc = ldap_build_entry( op, e, &ent, &bdn );
 289                         if ( rc == LDAP_SUCCESS ) {
 290                                 rs->sr_entry = &ent;
 291                                 rs->sr_attrs = op->ors_attrs;
 292                                 rs->sr_operational_attrs = NULL;
 293                                 rs->sr_flags = 0;
 294                                 abort = send_search_entry( op, rs );
 295                                 if ( !BER_BVISNULL( &ent.e_name ) ) {
 296                                         assert( ent.e_name.bv_val != bdn.bv_val );
 297                                         free( ent.e_name.bv_val );
 298                                         BER_BVZERO( &ent.e_name );
 299                                 }
 300                                 if ( !BER_BVISNULL( &ent.e_nname ) ) {
 301                                         free( ent.e_nname.bv_val );
 302                                         BER_BVZERO( &ent.e_nname );
 303                                 }
 304                                 entry_clean( &ent );
 305                         }
 306                         ldap_msgfree( res );
 307                         if ( abort ) {
 308                                 ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 309                                 goto finish;
 310                         }
 311
 312                 } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
 313                         char            **references = NULL;
 314                         int             cnt;
 315
 316                         do_retry = 0;
 317                         rc = ldap_parse_reference( lc->lc_ld, res,
 318                                         &references, &rs->sr_ctrls, 1 );
 319
 320                         if ( rc != LDAP_SUCCESS ) {
 321                                 continue;
 322                         }
 323
 324                         if ( references == NULL ) {
 325                                 continue;
 326                         }
 327
 328                         for ( cnt = 0; references[ cnt ]; cnt++ )
 329                                 /* NO OP */ ;
 330
 331                         rs->sr_ref = ch_calloc( cnt + 1, sizeof( struct berval ) );
 332
 333                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
 334                                 ber_str2bv( references[ cnt ], 0, 0, &rs->sr_ref[ cnt ] );
 335                         }
 336
 337                         /* ignore return value by now */
 338                         ( void )send_search_reference( op, rs );
 339
 340                         /* cleanup */
 341                         if ( references ) {
 342                                 ldap_value_free( references );
 343                                 ch_free( rs->sr_ref );
 344                                 rs->sr_ref = NULL;
 345                         }
 346
 347                         if ( rs->sr_ctrls ) {
 348                                 ldap_controls_free( rs->sr_ctrls );
 349                                 rs->sr_ctrls = NULL;
 350                         }
 351
 352                 } else {
 353                         char            **references = NULL;
 354
 355                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 356                                         &match.bv_val, (char **)&rs->sr_text,
 357                                         &references, &rs->sr_ctrls, 1 );
 358                         if ( rc != LDAP_SUCCESS ) {
 359                                 rs->sr_err = rc;
 360                         }
 361                         rs->sr_err = slap_map_api2result( rs );
 362
 363                         if ( references ) {
 364                                 int     cnt;
 365
 366                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 367                                         /* NO OP */ ;
 368
 369                                 rs->sr_ref = ch_calloc( cnt + 1, sizeof( struct berval ) );
 370
 371                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 372                                         ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
 373                                 }
 374
 375                                 /* cleanup */
 376                                 if ( references ) {
 377                                         ldap_value_free( references );
 378                                 }
 379                         }
 380
 381                         rc = 0;
 382                         break;
 383                 }
 384         }
 385
 386         if ( rc == -1 ) {
 387                 if ( do_retry ) {
 388                         do_retry = 0;
 389                         if ( ldap_back_retry( lc, op, rs, LDAP_BACK_SENDERR ) ) {
 390                                 goto retry;
 391                         }
 392                 }
 393                 rs->sr_err = LDAP_SERVER_DOWN;
 394                 goto fail;
 395         }
 396
 397         /*
 398          * Rewrite the matched portion of the search base, if required
 399          */
 400         if ( !BER_BVISNULL( &match ) && !BER_BVISEMPTY( &match ) ) {
 401                 rs->sr_matched = match.bv_val;
 402         }
 403         if ( rs->sr_v2ref ) {
 404                 rs->sr_err = LDAP_REFERRAL;
 405         }
 406
 407 finish:;
 408         if ( rc != SLAPD_ABANDON ) {
 409                 send_ldap_result( op, rs );
 410         }
 411
 412         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 413
 414         if ( rs->sr_ctrls ) {
 415                 ldap_controls_free( rs->sr_ctrls );
 416                 rs->sr_ctrls = NULL;
 417         }
 418
 419         if ( match.bv_val ) {
 420                 rs->sr_matched = NULL;
 421                 LDAP_FREE( match.bv_val );
 422         }
 423
 424         if ( !BER_BVISNULL( &filter ) && filter.bv_val != op->ors_filterstr.bv_val ) {
 425                 op->o_tmpfree( filter.bv_val, op->o_tmpmemctx );
 426         }
 427
 428         if ( rs->sr_text ) {
 429                 if ( !dontfreetext ) {
 430                         LDAP_FREE( (char *)rs->sr_text );
 431                 }
 432                 rs->sr_text = NULL;
 433         }
 434
 435         if ( rs->sr_ref ) {
 436                 ber_bvarray_free( rs->sr_ref );
 437                 rs->sr_ref = NULL;
 438         }
 439
 440         if ( attrs ) {
 441                 ch_free( attrs );
 442         }
 443
 444         if ( lc != NULL ) {
 445                 ldap_back_release_conn( op, rs, lc );
 446         }
 447
 448         return rc;
 449 }
 450
 451 static int
 452 ldap_build_entry(
 453                 Operation       *op,
 454                 LDAPMessage     *e,
 455                 Entry           *ent,
 456                 struct berval   *bdn )
 457 {
 458         struct berval   a;
 459         BerElement      ber = *e->lm_ber;
 460         Attribute       *attr, **attrp;
 461         const char      *text;
 462         int             last;
 463
 464         /* safe assumptions ... */
 465         assert( ent != NULL );
 466         BER_BVZERO( &ent->e_bv );
 467
 468         if ( ber_scanf( &ber, "{m{", bdn ) == LBER_ERROR ) {
 469                 return LDAP_DECODING_ERROR;
 470         }
 471
 472         /*
 473          * Note: this may fail if the target host(s) schema differs
 474          * from the one known to the meta, and a DN with unknown
 475          * attributes is returned.
 476          *
 477          * FIXME: should we log anything, or delegate to dnNormalize?
 478          */
 479         /* Note: if the distinguished values or the naming attributes
 480          * change, should we massage them as well?
 481          */
 482         if ( dnPrettyNormal( NULL, bdn, &ent->e_name, &ent->e_nname,
 483                 op->o_tmpmemctx ) != LDAP_SUCCESS )
 484         {
 485                 return LDAP_INVALID_DN_SYNTAX;
 486         }
 487
 488         attrp = &ent->e_attrs;
 489
 490         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
 491                 int                             i;
 492                 slap_syntax_validate_func       *validate;
 493                 slap_syntax_transform_func      *pretty;
 494
 495                 attr = (Attribute *)ch_malloc( sizeof( Attribute ) );
 496                 if ( attr == NULL ) {
 497                         continue;
 498                 }
 499                 attr->a_flags = 0;
 500                 attr->a_next = 0;
 501                 attr->a_desc = NULL;
 502                 if ( slap_bv2ad( &a, &attr->a_desc, &text )
 503                                 != LDAP_SUCCESS )
 504                 {
 505                         if ( slap_bv2undef_ad( &a, &attr->a_desc, &text )
 506                                         != LDAP_SUCCESS )
 507                         {
 508                                 Debug( LDAP_DEBUG_ANY,
 509                                         "slap_bv2undef_ad(%s):  %s\n",
 510                                         a.bv_val, text, 0 );
 511                                 ch_free( attr );
 512                                 continue;
 513                         }
 514                 }
 515
 516                 /* no subschemaSubentry */
 517                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry ) {
 518
 519                         /*
 520                          * We eat target's subschemaSubentry because
 521                          * a search for this value is likely not
 522                          * to resolve to the appropriate backend;
 523                          * later, the local subschemaSubentry is
 524                          * added.
 525                          */
 526                         ( void )ber_scanf( &ber, "x" /* [W] */ );
 527
 528                         ch_free( attr );
 529                         continue;
 530                 }
 531
 532                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
 533                                 || attr->a_vals == NULL )
 534                 {
 535                         /*
 536                          * Note: attr->a_vals can be null when using
 537                          * values result filter
 538                          */
 539                         attr->a_vals = (struct berval *)&slap_dummy_bv;
 540                         last = 0;
 541
 542                 } else {
 543                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); last++ )
 544                                 /* just count vals */ ;
 545                 }
 546
 547                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
 548                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
 549
 550                 if ( !validate && !pretty ) {
 551                         attr->a_nvals = NULL;
 552                         attr_free( attr );
 553                         goto next_attr;
 554                 }
 555
 556                 for ( i = 0; i < last; i++ ) {
 557                         struct berval   pval;
 558                         int             rc;
 559
 560                         if ( pretty ) {
 561                                 rc = pretty( attr->a_desc->ad_type->sat_syntax,
 562                                         &attr->a_vals[i], &pval, NULL );
 563
 564                         } else {
 565                                 rc = validate( attr->a_desc->ad_type->sat_syntax,
 566                                         &attr->a_vals[i] );
 567                         }
 568
 569                         if ( rc != LDAP_SUCCESS ) {
 570                                 /* check if, by chance, it's an undefined objectClass */
 571                                 if ( attr->a_desc == slap_schema.si_ad_objectClass &&
 572                                                 oc_bvfind_undef( &attr->a_vals[i] ) != NULL )
 573                                 {
 574                                         ber_dupbv( &pval, &attr->a_vals[i] );
 575
 576                                 } else {
 577                                         attr->a_nvals = NULL;
 578                                         attr_free( attr );
 579                                         goto next_attr;
 580                                 }
 581                         }
 582
 583                         if ( pretty ) {
 584                                 LBER_FREE( attr->a_vals[i].bv_val );
 585                                 attr->a_vals[i] = pval;
 586                         }
 587                 }
 588
 589                 if ( last && attr->a_desc->ad_type->sat_equality &&
 590                                 attr->a_desc->ad_type->sat_equality->smr_normalize )
 591                 {
 592                         attr->a_nvals = ch_malloc( ( last + 1 )*sizeof( struct berval ) );
 593                         for ( i = 0; i < last; i++ ) {
 594                                 int             rc;
 595
 596                                 /*
 597                                  * check that each value is valid per syntax
 598                                  * and pretty if appropriate
 599                                  */
 600                                 rc = attr->a_desc->ad_type->sat_equality->smr_normalize(
 601                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 602                                         attr->a_desc->ad_type->sat_syntax,
 603                                         attr->a_desc->ad_type->sat_equality,
 604                                         &attr->a_vals[i], &attr->a_nvals[i],
 605                                         NULL );
 606
 607                                 if ( rc != LDAP_SUCCESS ) {
 608                                         BER_BVZERO( &attr->a_nvals[i] );
 609                                         ch_free( attr );
 610                                         goto next_attr;
 611                                 }
 612                         }
 613                         BER_BVZERO( &attr->a_nvals[i] );
 614
 615                 } else {
 616                         attr->a_nvals = attr->a_vals;
 617                 }
 618                 *attrp = attr;
 619                 attrp = &attr->a_next;
 620
 621 next_attr:;
 622         }
 623
 624         return LDAP_SUCCESS;
 625 }
 626
 627 /* return 0 IFF we can retrieve the entry with ndn
 628  */
 629 int
 630 ldap_back_entry_get(
 631                 Operation               *op,
 632                 struct berval           *ndn,
 633                 ObjectClass             *oc,
 634                 AttributeDescription    *at,
 635                 int                     rw,
 636                 Entry                   **ent
 637 )
 638 {
 639         struct ldapconn *lc;
 640         int             rc = 1,
 641                         do_not_cache;
 642         struct berval   bdn;
 643         LDAPMessage     *result = NULL,
 644                         *e = NULL;
 645         char            *gattr[3];
 646         char            *filter = NULL;
 647         SlapReply       rs;
 648         int             do_retry = 1;
 649         LDAPControl     **ctrls = NULL;
 650
 651         /* Tell getconn this is a privileged op */
 652         do_not_cache = op->o_do_not_cache;
 653         op->o_do_not_cache = 1;
 654         lc = ldap_back_getconn( op, &rs, LDAP_BACK_DONTSEND );
 655         if ( !lc || !ldap_back_dobind( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 656                 op->o_do_not_cache = do_not_cache;
 657                 return rs.sr_err;
 658         }
 659         op->o_do_not_cache = do_not_cache;
 660
 661         if ( at ) {
 662                 if ( oc && at != slap_schema.si_ad_objectClass ) {
 663                         gattr[0] = slap_schema.si_ad_objectClass->ad_cname.bv_val;
 664                         gattr[1] = at->ad_cname.bv_val;
 665                         gattr[2] = NULL;
 666
 667                 } else {
 668                         gattr[0] = at->ad_cname.bv_val;
 669                         gattr[1] = NULL;
 670                 }
 671         }
 672
 673         if ( oc ) {
 674                 char    *ptr;
 675
 676                 filter = ch_malloc( STRLENOF( "(objectclass=)" )
 677                                 + oc->soc_cname.bv_len + 1 );
 678                 ptr = lutil_strcopy( filter, "(objectclass=" );
 679                 ptr = lutil_strcopy( ptr, oc->soc_cname.bv_val );
 680                 *ptr++ = ')';
 681                 *ptr++ = '\0';
 682         }
 683
 684         ctrls = op->o_ctrls;
 685         rc = ldap_back_proxy_authz_ctrl( lc, op, &rs, &ctrls );
 686         if ( rc != LDAP_SUCCESS ) {
 687                 goto cleanup;
 688         }
 689
 690 retry:
 691         rc = ldap_search_ext_s( lc->lc_ld, ndn->bv_val, LDAP_SCOPE_BASE, filter,
 692                                 at ? gattr : NULL, 0, ctrls, NULL,
 693                                 LDAP_NO_LIMIT, LDAP_NO_LIMIT, &result );
 694         if ( rc != LDAP_SUCCESS ) {
 695                 if ( rc == LDAP_SERVER_DOWN && do_retry ) {
 696                         do_retry = 0;
 697                         if ( ldap_back_retry( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 698                                 goto retry;
 699                         }
 700                 }
 701                 goto cleanup;
 702         }
 703
 704         e = ldap_first_entry( lc->lc_ld, result );
 705         if ( e == NULL ) {
 706                 goto cleanup;
 707         }
 708
 709         *ent = ch_calloc( 1, sizeof( Entry ) );
 710
 711         rc = ldap_build_entry( op, e, *ent, &bdn );
 712
 713         if ( rc != LDAP_SUCCESS ) {
 714                 ch_free( *ent );
 715                 *ent = NULL;
 716         }
 717
 718 cleanup:
 719         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 720
 721         if ( result ) {
 722                 ldap_msgfree( result );
 723         }
 724
 725         if ( filter ) {
 726                 ch_free( filter );
 727         }
 728
 729         if ( lc != NULL ) {
 730                 ldap_back_release_conn( op, &rs, lc );
 731         }
 732
 733         return rc;
 734 }
 735