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             freetext = 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                 goto finish;
 205         }
 206
 207         /* deal with <draft-zeilenga-ldap-t-f> filters */
 208         filter = op->ors_filterstr;
 209 retry:
 210         rs->sr_err = ldap_search_ext( lc->lc_ld, op->o_req_ndn.bv_val,
 211                         op->ors_scope, filter.bv_val,
 212                         attrs, op->ors_attrsonly, ctrls, NULL,
 213                         tv.tv_sec ? &tv : NULL,
 214                         op->ors_slimit, &msgid );
 215
 216         if ( rs->sr_err != LDAP_SUCCESS ) {
 217 fail:;
 218                 switch ( rs->sr_err ) {
 219                 case LDAP_SERVER_DOWN:
 220                         if ( do_retry ) {
 221                                 do_retry = 0;
 222                                 if ( ldap_back_retry( lc, op, rs, LDAP_BACK_DONTSEND ) ) {
 223                                         goto retry;
 224                                 }
 225                         }
 226                         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 227                         ldap_back_freeconn( op, lc );
 228                         lc = NULL;
 229                         goto finish;
 230
 231                 case LDAP_FILTER_ERROR:
 232                         if ( ldap_back_munge_filter( op, &filter ) ) {
 233                                 goto retry;
 234                         }
 235
 236                         /* invalid filters return success with no data */
 237                         rs->sr_err = LDAP_SUCCESS;
 238                         rs->sr_text = NULL;
 239                         goto finish;
 240
 241                 default:
 242                         rs->sr_err = slap_map_api2result( rs );
 243                         rs->sr_text = NULL;
 244                         goto finish;
 245                 }
 246         }
 247
 248         /* We pull apart the ber result, stuff it into a slapd entry, and
 249          * let send_search_entry stuff it back into ber format. Slow & ugly,
 250          * but this is necessary for version matching, and for ACL processing.
 251          */
 252
 253         for ( rc = 0; rc != -1; rc = ldap_result( lc->lc_ld, msgid, 0, &tv, &res ) )
 254         {
 255                 /* check for abandon */
 256                 if ( op->o_abandon ) {
 257                         if ( rc > 0 ) {
 258                                 ldap_msgfree( res );
 259                         }
 260                         ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 261                         rc = SLAPD_ABANDON;
 262                         goto finish;
 263                 }
 264
 265                 if ( rc == 0 ) {
 266                         tv.tv_sec = 0;
 267                         tv.tv_usec = 100000;
 268                         ldap_pvt_thread_yield();
 269
 270                         /* check time limit */
 271                         if ( op->ors_tlimit != SLAP_NO_LIMIT
 272                                         && slap_get_time() > stoptime )
 273                         {
 274                                 ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 275                                 rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 276                                 goto finish;
 277                         }
 278
 279                 } else if ( rc == LDAP_RES_SEARCH_ENTRY ) {
 280                         Entry           ent = { 0 };
 281                         struct berval   bdn = BER_BVNULL;
 282                         int             abort = 0;
 283
 284                         do_retry = 0;
 285
 286                         e = ldap_first_entry( lc->lc_ld, res );
 287                         rc = ldap_build_entry( op, e, &ent, &bdn );
 288                         if ( rc == LDAP_SUCCESS ) {
 289                                 rs->sr_entry = &ent;
 290                                 rs->sr_attrs = op->ors_attrs;
 291                                 rs->sr_operational_attrs = NULL;
 292                                 rs->sr_flags = 0;
 293                                 abort = send_search_entry( op, rs );
 294                                 if ( !BER_BVISNULL( &ent.e_name ) ) {
 295                                         assert( ent.e_name.bv_val != bdn.bv_val );
 296                                         free( ent.e_name.bv_val );
 297                                         BER_BVZERO( &ent.e_name );
 298                                 }
 299                                 if ( !BER_BVISNULL( &ent.e_nname ) ) {
 300                                         free( ent.e_nname.bv_val );
 301                                         BER_BVZERO( &ent.e_nname );
 302                                 }
 303                                 entry_clean( &ent );
 304                         }
 305                         ldap_msgfree( res );
 306                         if ( abort ) {
 307                                 ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 308                                 goto finish;
 309                         }
 310
 311                 } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
 312                         char            **references = NULL;
 313
 314                         do_retry = 0;
 315                         rc = ldap_parse_reference( lc->lc_ld, res,
 316                                         &references, &rs->sr_ctrls, 1 );
 317
 318                         if ( rc != LDAP_SUCCESS ) {
 319                                 continue;
 320                         }
 321
 322                         /* FIXME: there MUST be at least one */
 323                         if ( references && references[ 0 ] && references[ 0 ][ 0 ] ) {
 324                                 int             cnt;
 325
 326                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 327                                         /* NO OP */ ;
 328
 329                                 /* FIXME: there MUST be at least one */
 330                                 rs->sr_ref = ch_malloc( ( cnt + 1 ) * sizeof( struct berval ) );
 331
 332                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 333                                         ber_str2bv( references[ cnt ], 0, 0, &rs->sr_ref[ cnt ] );
 334                                 }
 335                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 336
 337                                 /* ignore return value by now */
 338                                 ( void )send_search_reference( op, rs );
 339
 340                         } else {
 341                                 Debug( LDAP_DEBUG_ANY,
 342                                         "%s ldap_back_search: "
 343                                         "got SEARCH_REFERENCE "
 344                                         "with no referrals\n",
 345                                         op->o_log_prefix, 0, 0 );
 346                         }
 347
 348                         /* cleanup */
 349                         if ( references ) {
 350                                 ldap_value_free( references );
 351                                 ch_free( rs->sr_ref );
 352                                 rs->sr_ref = NULL;
 353                         }
 354
 355                         if ( rs->sr_ctrls ) {
 356                                 ldap_controls_free( rs->sr_ctrls );
 357                                 rs->sr_ctrls = NULL;
 358                         }
 359
 360                 } else {
 361                         char            **references = NULL;
 362
 363                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 364                                         &match.bv_val, (char **)&rs->sr_text,
 365                                         &references, &rs->sr_ctrls, 1 );
 366                         freetext = 1;
 367                         if ( rc != LDAP_SUCCESS ) {
 368                                 rs->sr_err = rc;
 369                         }
 370                         rs->sr_err = slap_map_api2result( rs );
 371
 372                         if ( references && references[ 0 ] && references[ 0 ][ 0 ] ) {
 373                                 int     cnt;
 374
 375                                 if ( rs->sr_err != LDAP_REFERRAL ) {
 376                                         /* FIXME: error */
 377                                         Debug( LDAP_DEBUG_ANY,
 378                                                 "%s ldap_back_search: "
 379                                                 "got referrals with %d\n",
 380                                                 op->o_log_prefix,
 381                                                 rs->sr_err, 0 );
 382                                         rs->sr_err = LDAP_REFERRAL;
 383                                 }
 384
 385                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 386                                         /* NO OP */ ;
 387
 388                                 rs->sr_ref = ch_malloc( ( cnt + 1 ) * sizeof( struct berval ) );
 389
 390                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 391                                         /* duplicating ...*/
 392                                         ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
 393                                 }
 394                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 395                         }
 396
 397                         if ( match.bv_val != NULL ) {
 398                                 if ( match.bv_val[ 0 ] == '\0' ) {
 399                                         LDAP_FREE( match.bv_val );
 400                                         BER_BVZERO( &match );
 401                                 } else {
 402                                         match.bv_len = strlen( match.bv_val );
 403                                 }
 404                         }
 405
 406                         /* cleanup */
 407                         if ( references ) {
 408                                 ldap_value_free( references );
 409                         }
 410
 411                         rc = 0;
 412                         break;
 413                 }
 414         }
 415
 416         if ( rc == -1 ) {
 417                 if ( do_retry ) {
 418                         do_retry = 0;
 419                         if ( ldap_back_retry( lc, op, rs, LDAP_BACK_SENDERR ) ) {
 420                                 goto retry;
 421                         }
 422                 }
 423                 rs->sr_err = LDAP_SERVER_DOWN;
 424                 goto fail;
 425         }
 426
 427         /*
 428          * Rewrite the matched portion of the search base, if required
 429          */
 430         if ( !BER_BVISNULL( &match ) && !BER_BVISEMPTY( &match ) ) {
 431                 rs->sr_matched = match.bv_val;
 432         }
 433
 434         if ( rs->sr_v2ref ) {
 435                 rs->sr_err = LDAP_REFERRAL;
 436         }
 437
 438 finish:;
 439         if ( rc != SLAPD_ABANDON ) {
 440                 send_ldap_result( op, rs );
 441         }
 442
 443         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 444
 445         if ( rs->sr_ctrls ) {
 446                 ldap_controls_free( rs->sr_ctrls );
 447                 rs->sr_ctrls = NULL;
 448         }
 449
 450         if ( match.bv_val ) {
 451                 rs->sr_matched = NULL;
 452                 LDAP_FREE( match.bv_val );
 453         }
 454
 455         if ( !BER_BVISNULL( &filter ) && filter.bv_val != op->ors_filterstr.bv_val ) {
 456                 op->o_tmpfree( filter.bv_val, op->o_tmpmemctx );
 457         }
 458
 459         if ( rs->sr_text ) {
 460                 if ( freetext ) {
 461                         LDAP_FREE( (char *)rs->sr_text );
 462                 }
 463                 rs->sr_text = NULL;
 464         }
 465
 466         if ( rs->sr_ref ) {
 467                 ber_bvarray_free( rs->sr_ref );
 468                 rs->sr_ref = NULL;
 469         }
 470
 471         if ( attrs ) {
 472                 ch_free( attrs );
 473         }
 474
 475         if ( lc != NULL ) {
 476                 ldap_back_release_conn( op, rs, lc );
 477         }
 478
 479         return rc;
 480 }
 481
 482 static int
 483 ldap_build_entry(
 484                 Operation       *op,
 485                 LDAPMessage     *e,
 486                 Entry           *ent,
 487                 struct berval   *bdn )
 488 {
 489         struct berval   a;
 490         BerElement      ber = *e->lm_ber;
 491         Attribute       *attr, **attrp;
 492         const char      *text;
 493         int             last;
 494
 495         /* safe assumptions ... */
 496         assert( ent != NULL );
 497         BER_BVZERO( &ent->e_bv );
 498
 499         if ( ber_scanf( &ber, "{m{", bdn ) == LBER_ERROR ) {
 500                 return LDAP_DECODING_ERROR;
 501         }
 502
 503         /*
 504          * Note: this may fail if the target host(s) schema differs
 505          * from the one known to the meta, and a DN with unknown
 506          * attributes is returned.
 507          *
 508          * FIXME: should we log anything, or delegate to dnNormalize?
 509          */
 510         /* Note: if the distinguished values or the naming attributes
 511          * change, should we massage them as well?
 512          */
 513         if ( dnPrettyNormal( NULL, bdn, &ent->e_name, &ent->e_nname,
 514                 op->o_tmpmemctx ) != LDAP_SUCCESS )
 515         {
 516                 return LDAP_INVALID_DN_SYNTAX;
 517         }
 518
 519         attrp = &ent->e_attrs;
 520
 521         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
 522                 int                             i;
 523                 slap_syntax_validate_func       *validate;
 524                 slap_syntax_transform_func      *pretty;
 525
 526                 attr = (Attribute *)ch_malloc( sizeof( Attribute ) );
 527                 if ( attr == NULL ) {
 528                         continue;
 529                 }
 530                 attr->a_flags = 0;
 531                 attr->a_next = 0;
 532                 attr->a_desc = NULL;
 533                 if ( slap_bv2ad( &a, &attr->a_desc, &text )
 534                                 != LDAP_SUCCESS )
 535                 {
 536                         if ( slap_bv2undef_ad( &a, &attr->a_desc, &text )
 537                                         != LDAP_SUCCESS )
 538                         {
 539                                 Debug( LDAP_DEBUG_ANY,
 540                                         "slap_bv2undef_ad(%s):  %s\n",
 541                                         a.bv_val, text, 0 );
 542                                 ch_free( attr );
 543                                 continue;
 544                         }
 545                 }
 546
 547                 /* no subschemaSubentry */
 548                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
 549                         || attr->a_desc == slap_schema.si_ad_entryDN )
 550                 {
 551
 552                         /*
 553                          * We eat target's subschemaSubentry because
 554                          * a search for this value is likely not
 555                          * to resolve to the appropriate backend;
 556                          * later, the local subschemaSubentry is
 557                          * added.
 558                          *
 559                          * We also eat entryDN because the frontend
 560                          * will reattach it without checking if already
 561                          * present...
 562                          */
 563                         ( void )ber_scanf( &ber, "x" /* [W] */ );
 564
 565                         ch_free( attr );
 566                         continue;
 567                 }
 568
 569                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
 570                                 || attr->a_vals == NULL )
 571                 {
 572                         /*
 573                          * Note: attr->a_vals can be null when using
 574                          * values result filter
 575                          */
 576                         attr->a_vals = (struct berval *)&slap_dummy_bv;
 577                         last = 0;
 578
 579                 } else {
 580                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); last++ )
 581                                 /* just count vals */ ;
 582                 }
 583
 584                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
 585                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
 586
 587                 if ( !validate && !pretty ) {
 588                         attr->a_nvals = NULL;
 589                         attr_free( attr );
 590                         goto next_attr;
 591                 }
 592
 593                 for ( i = 0; i < last; i++ ) {
 594                         struct berval   pval;
 595                         int             rc;
 596
 597                         if ( pretty ) {
 598                                 rc = pretty( attr->a_desc->ad_type->sat_syntax,
 599                                         &attr->a_vals[i], &pval, NULL );
 600
 601                         } else {
 602                                 rc = validate( attr->a_desc->ad_type->sat_syntax,
 603                                         &attr->a_vals[i] );
 604                         }
 605
 606                         if ( rc != LDAP_SUCCESS ) {
 607                                 /* check if, by chance, it's an undefined objectClass */
 608                                 if ( attr->a_desc == slap_schema.si_ad_objectClass &&
 609                                                 oc_bvfind_undef( &attr->a_vals[i] ) != NULL )
 610                                 {
 611                                         ber_dupbv( &pval, &attr->a_vals[i] );
 612
 613                                 } else {
 614                                         attr->a_nvals = NULL;
 615                                         attr_free( attr );
 616                                         goto next_attr;
 617                                 }
 618                         }
 619
 620                         if ( pretty ) {
 621                                 LBER_FREE( attr->a_vals[i].bv_val );
 622                                 attr->a_vals[i] = pval;
 623                         }
 624                 }
 625
 626                 if ( last && attr->a_desc->ad_type->sat_equality &&
 627                                 attr->a_desc->ad_type->sat_equality->smr_normalize )
 628                 {
 629                         attr->a_nvals = ch_malloc( ( last + 1 )*sizeof( struct berval ) );
 630                         for ( i = 0; i < last; i++ ) {
 631                                 int             rc;
 632
 633                                 /*
 634                                  * check that each value is valid per syntax
 635                                  * and pretty if appropriate
 636                                  */
 637                                 rc = attr->a_desc->ad_type->sat_equality->smr_normalize(
 638                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 639                                         attr->a_desc->ad_type->sat_syntax,
 640                                         attr->a_desc->ad_type->sat_equality,
 641                                         &attr->a_vals[i], &attr->a_nvals[i],
 642                                         NULL );
 643
 644                                 if ( rc != LDAP_SUCCESS ) {
 645                                         BER_BVZERO( &attr->a_nvals[i] );
 646                                         ch_free( attr );
 647                                         goto next_attr;
 648                                 }
 649                         }
 650                         BER_BVZERO( &attr->a_nvals[i] );
 651
 652                 } else {
 653                         attr->a_nvals = attr->a_vals;
 654                 }
 655                 *attrp = attr;
 656                 attrp = &attr->a_next;
 657
 658 next_attr:;
 659         }
 660
 661         return LDAP_SUCCESS;
 662 }
 663
 664 /* return 0 IFF we can retrieve the entry with ndn
 665  */
 666 int
 667 ldap_back_entry_get(
 668                 Operation               *op,
 669                 struct berval           *ndn,
 670                 ObjectClass             *oc,
 671                 AttributeDescription    *at,
 672                 int                     rw,
 673                 Entry                   **ent
 674 )
 675 {
 676         struct ldapconn *lc;
 677         int             rc = 1,
 678                         do_not_cache;
 679         struct berval   bdn;
 680         LDAPMessage     *result = NULL,
 681                         *e = NULL;
 682         char            *gattr[3];
 683         char            *filter = NULL;
 684         SlapReply       rs;
 685         int             do_retry = 1;
 686         LDAPControl     **ctrls = NULL;
 687
 688         /* Tell getconn this is a privileged op */
 689         do_not_cache = op->o_do_not_cache;
 690         op->o_do_not_cache = 1;
 691         lc = ldap_back_getconn( op, &rs, LDAP_BACK_DONTSEND );
 692         if ( !lc || !ldap_back_dobind( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 693                 op->o_do_not_cache = do_not_cache;
 694                 return rs.sr_err;
 695         }
 696         op->o_do_not_cache = do_not_cache;
 697
 698         if ( at ) {
 699                 if ( oc && at != slap_schema.si_ad_objectClass ) {
 700                         gattr[0] = slap_schema.si_ad_objectClass->ad_cname.bv_val;
 701                         gattr[1] = at->ad_cname.bv_val;
 702                         gattr[2] = NULL;
 703
 704                 } else {
 705                         gattr[0] = at->ad_cname.bv_val;
 706                         gattr[1] = NULL;
 707                 }
 708         }
 709
 710         if ( oc ) {
 711                 char    *ptr;
 712
 713                 filter = ch_malloc( STRLENOF( "(objectclass=)" )
 714                                 + oc->soc_cname.bv_len + 1 );
 715                 ptr = lutil_strcopy( filter, "(objectclass=" );
 716                 ptr = lutil_strcopy( ptr, oc->soc_cname.bv_val );
 717                 *ptr++ = ')';
 718                 *ptr++ = '\0';
 719         }
 720
 721         ctrls = op->o_ctrls;
 722         rc = ldap_back_proxy_authz_ctrl( lc, op, &rs, &ctrls );
 723         if ( rc != LDAP_SUCCESS ) {
 724                 goto cleanup;
 725         }
 726
 727 retry:
 728         rc = ldap_search_ext_s( lc->lc_ld, ndn->bv_val, LDAP_SCOPE_BASE, filter,
 729                                 at ? gattr : NULL, 0, ctrls, NULL,
 730                                 LDAP_NO_LIMIT, LDAP_NO_LIMIT, &result );
 731         if ( rc != LDAP_SUCCESS ) {
 732                 if ( rc == LDAP_SERVER_DOWN && do_retry ) {
 733                         do_retry = 0;
 734                         if ( ldap_back_retry( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 735                                 goto retry;
 736                         }
 737                 }
 738                 goto cleanup;
 739         }
 740
 741         e = ldap_first_entry( lc->lc_ld, result );
 742         if ( e == NULL ) {
 743                 goto cleanup;
 744         }
 745
 746         *ent = ch_calloc( 1, sizeof( Entry ) );
 747
 748         rc = ldap_build_entry( op, e, *ent, &bdn );
 749
 750         if ( rc != LDAP_SUCCESS ) {
 751                 ch_free( *ent );
 752                 *ent = NULL;
 753         }
 754
 755 cleanup:
 756         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 757
 758         if ( result ) {
 759                 ldap_msgfree( result );
 760         }
 761
 762         if ( filter ) {
 763                 ch_free( filter );
 764         }
 765
 766         if ( lc != NULL ) {
 767                 ldap_back_release_conn( op, &rs, lc );
 768         }
 769
 770         return rc;
 771 }
 772