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                         ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 259                         rc = SLAPD_ABANDON;
 260                         goto finish;
 261                 }
 262
 263                 if ( rc == 0 ) {
 264                         tv.tv_sec = 0;
 265                         tv.tv_usec = 100000;
 266                         ldap_pvt_thread_yield();
 267
 268                         /* check time limit */
 269                         if ( op->ors_tlimit != SLAP_NO_LIMIT
 270                                         && slap_get_time() > stoptime )
 271                         {
 272                                 ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 273                                 rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 274                                 goto finish;
 275                         }
 276
 277                 } else if ( rc == LDAP_RES_SEARCH_ENTRY ) {
 278                         Entry           ent = { 0 };
 279                         struct berval   bdn = BER_BVNULL;
 280                         int             abort = 0;
 281
 282                         do_retry = 0;
 283
 284                         e = ldap_first_entry( lc->lc_ld, res );
 285                         rc = ldap_build_entry( op, e, &ent, &bdn );
 286                         if ( rc == LDAP_SUCCESS ) {
 287                                 rs->sr_entry = &ent;
 288                                 rs->sr_attrs = op->ors_attrs;
 289                                 rs->sr_operational_attrs = NULL;
 290                                 rs->sr_flags = 0;
 291                                 abort = send_search_entry( op, rs );
 292                                 if ( !BER_BVISNULL( &ent.e_name ) ) {
 293                                         assert( ent.e_name.bv_val != bdn.bv_val );
 294                                         free( ent.e_name.bv_val );
 295                                         BER_BVZERO( &ent.e_name );
 296                                 }
 297                                 if ( !BER_BVISNULL( &ent.e_nname ) ) {
 298                                         free( ent.e_nname.bv_val );
 299                                         BER_BVZERO( &ent.e_nname );
 300                                 }
 301                                 entry_clean( &ent );
 302                         }
 303                         ldap_msgfree( res );
 304                         if ( abort ) {
 305                                 ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 306                                 goto finish;
 307                         }
 308
 309                 } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
 310                         char            **references = NULL;
 311                         int             cnt;
 312
 313                         do_retry = 0;
 314                         rc = ldap_parse_reference( lc->lc_ld, res,
 315                                         &references, &rs->sr_ctrls, 1 );
 316
 317                         if ( rc != LDAP_SUCCESS ) {
 318                                 continue;
 319                         }
 320
 321                         if ( references == NULL ) {
 322                                 continue;
 323                         }
 324
 325                         for ( cnt = 0; references[ cnt ]; cnt++ )
 326                                 /* NO OP */ ;
 327
 328                         rs->sr_ref = ch_calloc( cnt + 1, sizeof( struct berval ) );
 329
 330                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
 331                                 ber_str2bv( references[ cnt ], 0, 0, &rs->sr_ref[ cnt ] );
 332                         }
 333
 334                         /* ignore return value by now */
 335                         ( void )send_search_reference( op, rs );
 336
 337                         /* cleanup */
 338                         if ( references ) {
 339                                 ldap_value_free( references );
 340                                 ch_free( rs->sr_ref );
 341                                 rs->sr_ref = NULL;
 342                         }
 343
 344                         if ( rs->sr_ctrls ) {
 345                                 ldap_controls_free( rs->sr_ctrls );
 346                                 rs->sr_ctrls = NULL;
 347                         }
 348
 349                 } else {
 350                         char            **references = NULL;
 351
 352                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 353                                         &match.bv_val, (char **)&rs->sr_text,
 354                                         &references, &rs->sr_ctrls, 1 );
 355                         if ( rc != LDAP_SUCCESS ) {
 356                                 rs->sr_err = rc;
 357                         }
 358                         rs->sr_err = slap_map_api2result( rs );
 359
 360                         if ( references ) {
 361                                 int     cnt;
 362
 363                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 364                                         /* NO OP */ ;
 365
 366                                 rs->sr_ref = ch_calloc( cnt + 1, sizeof( struct berval ) );
 367
 368                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 369                                         ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
 370                                 }
 371
 372                                 /* cleanup */
 373                                 if ( references ) {
 374                                         ldap_value_free( references );
 375                                 }
 376                         }
 377
 378                         rc = 0;
 379                         break;
 380                 }
 381         }
 382
 383         if ( rc == -1 ) {
 384                 if ( do_retry ) {
 385                         do_retry = 0;
 386                         if ( ldap_back_retry( lc, op, rs, LDAP_BACK_SENDERR ) ) {
 387                                 goto retry;
 388                         }
 389                 }
 390                 rs->sr_err = LDAP_SERVER_DOWN;
 391                 goto fail;
 392         }
 393
 394         /*
 395          * Rewrite the matched portion of the search base, if required
 396          */
 397         if ( !BER_BVISNULL( &match ) && !BER_BVISEMPTY( &match ) ) {
 398                 rs->sr_matched = match.bv_val;
 399         }
 400         if ( rs->sr_v2ref ) {
 401                 rs->sr_err = LDAP_REFERRAL;
 402         }
 403
 404 finish:;
 405         if ( rc != SLAPD_ABANDON ) {
 406                 send_ldap_result( op, rs );
 407         }
 408
 409         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 410
 411         if ( rs->sr_ctrls ) {
 412                 ldap_controls_free( rs->sr_ctrls );
 413                 rs->sr_ctrls = NULL;
 414         }
 415
 416         if ( match.bv_val ) {
 417                 rs->sr_matched = NULL;
 418                 LDAP_FREE( match.bv_val );
 419         }
 420
 421         if ( !BER_BVISNULL( &filter ) && filter.bv_val != op->ors_filterstr.bv_val ) {
 422                 op->o_tmpfree( filter.bv_val, op->o_tmpmemctx );
 423         }
 424
 425         if ( rs->sr_text ) {
 426                 if ( !dontfreetext ) {
 427                         LDAP_FREE( (char *)rs->sr_text );
 428                 }
 429                 rs->sr_text = NULL;
 430         }
 431
 432         if ( rs->sr_ref ) {
 433                 ber_bvarray_free( rs->sr_ref );
 434                 rs->sr_ref = NULL;
 435         }
 436
 437         if ( attrs ) {
 438                 ch_free( attrs );
 439         }
 440
 441         if ( lc != NULL ) {
 442                 ldap_back_release_conn( op, rs, lc );
 443         }
 444
 445         return rc;
 446 }
 447
 448 static int
 449 ldap_build_entry(
 450                 Operation       *op,
 451                 LDAPMessage     *e,
 452                 Entry           *ent,
 453                 struct berval   *bdn )
 454 {
 455         struct berval   a;
 456         BerElement      ber = *e->lm_ber;
 457         Attribute       *attr, **attrp;
 458         const char      *text;
 459         int             last;
 460
 461         /* safe assumptions ... */
 462         assert( ent );
 463         BER_BVZERO( &ent->e_bv );
 464
 465         if ( ber_scanf( &ber, "{m{", bdn ) == LBER_ERROR ) {
 466                 return LDAP_DECODING_ERROR;
 467         }
 468
 469         /*
 470          * Note: this may fail if the target host(s) schema differs
 471          * from the one known to the meta, and a DN with unknown
 472          * attributes is returned.
 473          *
 474          * FIXME: should we log anything, or delegate to dnNormalize?
 475          */
 476         /* Note: if the distinguished values or the naming attributes
 477          * change, should we massage them as well?
 478          */
 479         if ( dnPrettyNormal( NULL, bdn, &ent->e_name, &ent->e_nname,
 480                 op->o_tmpmemctx ) != LDAP_SUCCESS )
 481         {
 482                 return LDAP_INVALID_DN_SYNTAX;
 483         }
 484
 485         attrp = &ent->e_attrs;
 486
 487         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
 488                 int                             i;
 489                 slap_syntax_validate_func       *validate;
 490                 slap_syntax_transform_func      *pretty;
 491
 492                 attr = (Attribute *)ch_malloc( sizeof( Attribute ) );
 493                 if ( attr == NULL ) {
 494                         continue;
 495                 }
 496                 attr->a_flags = 0;
 497                 attr->a_next = 0;
 498                 attr->a_desc = NULL;
 499                 if ( slap_bv2ad( &a, &attr->a_desc, &text )
 500                                 != LDAP_SUCCESS )
 501                 {
 502                         if ( slap_bv2undef_ad( &a, &attr->a_desc, &text )
 503                                         != LDAP_SUCCESS )
 504                         {
 505                                 Debug( LDAP_DEBUG_ANY,
 506                                         "slap_bv2undef_ad(%s):  %s\n",
 507                                         a.bv_val, text, 0 );
 508                                 ch_free( attr );
 509                                 continue;
 510                         }
 511                 }
 512
 513                 /* no subschemaSubentry */
 514                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry ) {
 515
 516                         /*
 517                          * We eat target's subschemaSubentry because
 518                          * a search for this value is likely not
 519                          * to resolve to the appropriate backend;
 520                          * later, the local subschemaSubentry is
 521                          * added.
 522                          */
 523                         ( void )ber_scanf( &ber, "x" /* [W] */ );
 524
 525                         ch_free( attr );
 526                         continue;
 527                 }
 528
 529                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
 530                                 || attr->a_vals == NULL )
 531                 {
 532                         /*
 533                          * Note: attr->a_vals can be null when using
 534                          * values result filter
 535                          */
 536                         attr->a_vals = (struct berval *)&slap_dummy_bv;
 537                         last = 0;
 538
 539                 } else {
 540                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); last++ )
 541                                 /* just count vals */ ;
 542                 }
 543
 544                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
 545                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
 546
 547                 if ( !validate && !pretty ) {
 548                         attr->a_nvals = NULL;
 549                         attr_free( attr );
 550                         goto next_attr;
 551                 }
 552
 553                 for ( i = 0; i < last; i++ ) {
 554                         struct berval   pval;
 555                         int             rc;
 556
 557                         if ( pretty ) {
 558                                 rc = pretty( attr->a_desc->ad_type->sat_syntax,
 559                                         &attr->a_vals[i], &pval, NULL );
 560
 561                         } else {
 562                                 rc = validate( attr->a_desc->ad_type->sat_syntax,
 563                                         &attr->a_vals[i] );
 564                         }
 565
 566                         if ( rc != LDAP_SUCCESS ) {
 567                                 /* check if, by chance, it's an undefined objectClass */
 568                                 if ( attr->a_desc == slap_schema.si_ad_objectClass &&
 569                                                 oc_bvfind_undef( &attr->a_vals[i] ) != NULL )
 570                                 {
 571                                         ber_dupbv( &pval, &attr->a_vals[i] );
 572
 573                                 } else {
 574                                         attr->a_nvals = NULL;
 575                                         attr_free( attr );
 576                                         goto next_attr;
 577                                 }
 578                         }
 579
 580                         if ( pretty ) {
 581                                 LBER_FREE( attr->a_vals[i].bv_val );
 582                                 attr->a_vals[i] = pval;
 583                         }
 584                 }
 585
 586                 if ( last && attr->a_desc->ad_type->sat_equality &&
 587                                 attr->a_desc->ad_type->sat_equality->smr_normalize )
 588                 {
 589                         attr->a_nvals = ch_malloc( ( last + 1 )*sizeof( struct berval ) );
 590                         for ( i = 0; i < last; i++ ) {
 591                                 int             rc;
 592
 593                                 /*
 594                                  * check that each value is valid per syntax
 595                                  * and pretty if appropriate
 596                                  */
 597                                 rc = attr->a_desc->ad_type->sat_equality->smr_normalize(
 598                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 599                                         attr->a_desc->ad_type->sat_syntax,
 600                                         attr->a_desc->ad_type->sat_equality,
 601                                         &attr->a_vals[i], &attr->a_nvals[i],
 602                                         NULL );
 603
 604                                 if ( rc != LDAP_SUCCESS ) {
 605                                         BER_BVZERO( &attr->a_nvals[i] );
 606                                         ch_free( attr );
 607                                         goto next_attr;
 608                                 }
 609                         }
 610                         BER_BVZERO( &attr->a_nvals[i] );
 611
 612                 } else {
 613                         attr->a_nvals = attr->a_vals;
 614                 }
 615                 *attrp = attr;
 616                 attrp = &attr->a_next;
 617
 618 next_attr:;
 619         }
 620
 621         return LDAP_SUCCESS;
 622 }
 623
 624 /* return 0 IFF we can retrieve the entry with ndn
 625  */
 626 int
 627 ldap_back_entry_get(
 628                 Operation               *op,
 629                 struct berval           *ndn,
 630                 ObjectClass             *oc,
 631                 AttributeDescription    *at,
 632                 int                     rw,
 633                 Entry                   **ent
 634 )
 635 {
 636         struct ldapconn *lc;
 637         int             rc = 1,
 638                         do_not_cache;
 639         struct berval   bdn;
 640         LDAPMessage     *result = NULL,
 641                         *e = NULL;
 642         char            *gattr[3];
 643         char            *filter = NULL;
 644         SlapReply       rs;
 645         int             do_retry = 1;
 646         LDAPControl     **ctrls = NULL;
 647
 648         /* Tell getconn this is a privileged op */
 649         do_not_cache = op->o_do_not_cache;
 650         op->o_do_not_cache = 1;
 651         lc = ldap_back_getconn( op, &rs, LDAP_BACK_DONTSEND );
 652         if ( !lc || !ldap_back_dobind( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 653                 op->o_do_not_cache = do_not_cache;
 654                 return rs.sr_err;
 655         }
 656         op->o_do_not_cache = do_not_cache;
 657
 658         if ( at ) {
 659                 if ( oc && at != slap_schema.si_ad_objectClass ) {
 660                         gattr[0] = slap_schema.si_ad_objectClass->ad_cname.bv_val;
 661                         gattr[1] = at->ad_cname.bv_val;
 662                         gattr[2] = NULL;
 663
 664                 } else {
 665                         gattr[0] = at->ad_cname.bv_val;
 666                         gattr[1] = NULL;
 667                 }
 668         }
 669
 670         if ( oc ) {
 671                 char    *ptr;
 672
 673                 filter = ch_malloc( STRLENOF( "(objectclass=)" )
 674                                 + oc->soc_cname.bv_len + 1 );
 675                 ptr = lutil_strcopy( filter, "(objectclass=" );
 676                 ptr = lutil_strcopy( ptr, oc->soc_cname.bv_val );
 677                 *ptr++ = ')';
 678                 *ptr++ = '\0';
 679         }
 680
 681         ctrls = op->o_ctrls;
 682         rc = ldap_back_proxy_authz_ctrl( lc, op, &rs, &ctrls );
 683         if ( rc != LDAP_SUCCESS ) {
 684                 goto cleanup;
 685         }
 686
 687 retry:
 688         rc = ldap_search_ext_s( lc->lc_ld, ndn->bv_val, LDAP_SCOPE_BASE, filter,
 689                                 at ? gattr : NULL, 0, ctrls, NULL,
 690                                 LDAP_NO_LIMIT, LDAP_NO_LIMIT, &result );
 691         if ( rc != LDAP_SUCCESS ) {
 692                 if ( rc == LDAP_SERVER_DOWN && do_retry ) {
 693                         do_retry = 0;
 694                         if ( ldap_back_retry( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 695                                 goto retry;
 696                         }
 697                 }
 698                 goto cleanup;
 699         }
 700
 701         e = ldap_first_entry( lc->lc_ld, result );
 702         if ( e == NULL ) {
 703                 goto cleanup;
 704         }
 705
 706         *ent = ch_calloc( 1, sizeof( Entry ) );
 707
 708         rc = ldap_build_entry( op, e, *ent, &bdn );
 709
 710         if ( rc != LDAP_SUCCESS ) {
 711                 ch_free( *ent );
 712                 *ent = NULL;
 713         }
 714
 715 cleanup:
 716         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 717
 718         if ( result ) {
 719                 ldap_msgfree( result );
 720         }
 721
 722         if ( filter ) {
 723                 ch_free( filter );
 724         }
 725
 726         if ( lc != NULL ) {
 727                 ldap_back_release_conn( op, &rs, lc );
 728         }
 729
 730         return rc;
 731 }
 732