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                 tv.tv_usec = 100000;
 183         }
 184
 185         if ( op->ors_attrs ) {
 186                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ )
 187                         /* just count attrs */ ;
 188
 189                 attrs = ch_malloc( ( i + 1 )*sizeof( char * ) );
 190                 if ( attrs == NULL ) {
 191                         rs->sr_err = LDAP_NO_MEMORY;
 192                         rc = -1;
 193                         goto finish;
 194                 }
 195
 196                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ ) {
 197                         attrs[ i ] = op->ors_attrs[i].an_name.bv_val;
 198                 }
 199                 attrs[ i ] = NULL;
 200         }
 201
 202         ctrls = op->o_ctrls;
 203         rc = ldap_back_proxy_authz_ctrl( lc, op, rs, &ctrls );
 204         if ( rc != LDAP_SUCCESS ) {
 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
 315                         do_retry = 0;
 316                         rc = ldap_parse_reference( lc->lc_ld, res,
 317                                         &references, &rs->sr_ctrls, 1 );
 318
 319                         if ( rc != LDAP_SUCCESS ) {
 320                                 continue;
 321                         }
 322
 323                         /* FIXME: there MUST be at least one */
 324                         if ( references && references[ 0 ] && references[ 0 ][ 0 ] ) {
 325                                 int             cnt;
 326
 327                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 328                                         /* NO OP */ ;
 329
 330                                 /* FIXME: there MUST be at least one */
 331                                 rs->sr_ref = ch_malloc( ( 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                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 337
 338                                 /* ignore return value by now */
 339                                 ( void )send_search_reference( op, rs );
 340
 341                         } else {
 342                                 Debug( LDAP_DEBUG_ANY,
 343                                         "%s ldap_back_search: "
 344                                         "got SEARCH_REFERENCE "
 345                                         "with no referrals\n",
 346                                         op->o_log_prefix, 0, 0 );
 347                         }
 348
 349                         /* cleanup */
 350                         if ( references ) {
 351                                 ldap_value_free( references );
 352                                 ch_free( rs->sr_ref );
 353                                 rs->sr_ref = NULL;
 354                         }
 355
 356                         if ( rs->sr_ctrls ) {
 357                                 ldap_controls_free( rs->sr_ctrls );
 358                                 rs->sr_ctrls = NULL;
 359                         }
 360
 361                 } else {
 362                         char            **references = NULL;
 363
 364                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 365                                         &match.bv_val, (char **)&rs->sr_text,
 366                                         &references, &rs->sr_ctrls, 1 );
 367                         freetext = 1;
 368                         if ( rc != LDAP_SUCCESS ) {
 369                                 rs->sr_err = rc;
 370                         }
 371                         rs->sr_err = slap_map_api2result( rs );
 372
 373                         if ( references && references[ 0 ] && references[ 0 ][ 0 ] ) {
 374                                 int     cnt;
 375
 376                                 if ( rs->sr_err != LDAP_REFERRAL ) {
 377                                         /* FIXME: error */
 378                                         Debug( LDAP_DEBUG_ANY,
 379                                                 "%s ldap_back_search: "
 380                                                 "got referrals with %d\n",
 381                                                 op->o_log_prefix,
 382                                                 rs->sr_err, 0 );
 383                                         rs->sr_err = LDAP_REFERRAL;
 384                                 }
 385
 386                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 387                                         /* NO OP */ ;
 388
 389                                 rs->sr_ref = ch_malloc( ( cnt + 1 ) * sizeof( struct berval ) );
 390
 391                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 392                                         /* duplicating ...*/
 393                                         ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
 394                                 }
 395                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 396                         }
 397
 398                         if ( match.bv_val != NULL ) {
 399                                 if ( match.bv_val[ 0 ] == '\0' ) {
 400                                         LDAP_FREE( match.bv_val );
 401                                         BER_BVZERO( &match );
 402                                 } else {
 403                                         match.bv_len = strlen( match.bv_val );
 404                                 }
 405                         }
 406
 407                         /* cleanup */
 408                         if ( references ) {
 409                                 ldap_value_free( references );
 410                         }
 411
 412                         rc = 0;
 413                         break;
 414                 }
 415         }
 416
 417         if ( rc == -1 ) {
 418                 if ( do_retry ) {
 419                         do_retry = 0;
 420                         if ( ldap_back_retry( lc, op, rs, LDAP_BACK_SENDERR ) ) {
 421                                 goto retry;
 422                         }
 423                 }
 424                 rs->sr_err = LDAP_SERVER_DOWN;
 425                 goto fail;
 426         }
 427
 428         /*
 429          * Rewrite the matched portion of the search base, if required
 430          */
 431         if ( !BER_BVISNULL( &match ) && !BER_BVISEMPTY( &match ) ) {
 432                 rs->sr_matched = match.bv_val;
 433         }
 434
 435         if ( rs->sr_v2ref ) {
 436                 rs->sr_err = LDAP_REFERRAL;
 437         }
 438
 439 finish:;
 440         if ( rc != SLAPD_ABANDON ) {
 441                 send_ldap_result( op, rs );
 442         }
 443
 444         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 445
 446         if ( rs->sr_ctrls ) {
 447                 ldap_controls_free( rs->sr_ctrls );
 448                 rs->sr_ctrls = NULL;
 449         }
 450
 451         if ( match.bv_val ) {
 452                 rs->sr_matched = NULL;
 453                 LDAP_FREE( match.bv_val );
 454         }
 455
 456         if ( !BER_BVISNULL( &filter ) && filter.bv_val != op->ors_filterstr.bv_val ) {
 457                 op->o_tmpfree( filter.bv_val, op->o_tmpmemctx );
 458         }
 459
 460         if ( rs->sr_text ) {
 461                 if ( freetext ) {
 462                         LDAP_FREE( (char *)rs->sr_text );
 463                 }
 464                 rs->sr_text = NULL;
 465         }
 466
 467         if ( rs->sr_ref ) {
 468                 ber_bvarray_free( rs->sr_ref );
 469                 rs->sr_ref = NULL;
 470         }
 471
 472         if ( attrs ) {
 473                 ch_free( attrs );
 474         }
 475
 476         if ( lc != NULL ) {
 477                 ldap_back_release_conn( op, rs, lc );
 478         }
 479
 480         return rc;
 481 }
 482
 483 static int
 484 ldap_build_entry(
 485                 Operation       *op,
 486                 LDAPMessage     *e,
 487                 Entry           *ent,
 488                 struct berval   *bdn )
 489 {
 490         struct berval   a;
 491         BerElement      ber = *e->lm_ber;
 492         Attribute       *attr, **attrp;
 493         const char      *text;
 494         int             last;
 495
 496         /* safe assumptions ... */
 497         assert( ent != NULL );
 498         BER_BVZERO( &ent->e_bv );
 499
 500         if ( ber_scanf( &ber, "{m{", bdn ) == LBER_ERROR ) {
 501                 return LDAP_DECODING_ERROR;
 502         }
 503
 504         /*
 505          * Note: this may fail if the target host(s) schema differs
 506          * from the one known to the meta, and a DN with unknown
 507          * attributes is returned.
 508          *
 509          * FIXME: should we log anything, or delegate to dnNormalize?
 510          */
 511         /* Note: if the distinguished values or the naming attributes
 512          * change, should we massage them as well?
 513          */
 514         if ( dnPrettyNormal( NULL, bdn, &ent->e_name, &ent->e_nname,
 515                 op->o_tmpmemctx ) != LDAP_SUCCESS )
 516         {
 517                 return LDAP_INVALID_DN_SYNTAX;
 518         }
 519
 520         attrp = &ent->e_attrs;
 521
 522         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
 523                 int                             i;
 524                 slap_syntax_validate_func       *validate;
 525                 slap_syntax_transform_func      *pretty;
 526
 527                 attr = (Attribute *)ch_malloc( sizeof( Attribute ) );
 528                 if ( attr == NULL ) {
 529                         continue;
 530                 }
 531                 attr->a_flags = 0;
 532                 attr->a_next = 0;
 533                 attr->a_desc = NULL;
 534                 if ( slap_bv2ad( &a, &attr->a_desc, &text )
 535                                 != LDAP_SUCCESS )
 536                 {
 537                         if ( slap_bv2undef_ad( &a, &attr->a_desc, &text,
 538                                 SLAP_AD_PROXIED ) != LDAP_SUCCESS )
 539                         {
 540                                 Debug( LDAP_DEBUG_ANY,
 541                                         "%s ldap_build_entry: "
 542                                         "slap_bv2undef_ad(%s): %s\n",
 543                                         op->o_log_prefix, a.bv_val, text );
 544                                 ch_free( attr );
 545                                 continue;
 546                         }
 547                 }
 548
 549                 /* no subschemaSubentry */
 550                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
 551                         || attr->a_desc == slap_schema.si_ad_entryDN )
 552                 {
 553
 554                         /*
 555                          * We eat target's subschemaSubentry because
 556                          * a search for this value is likely not
 557                          * to resolve to the appropriate backend;
 558                          * later, the local subschemaSubentry is
 559                          * added.
 560                          *
 561                          * We also eat entryDN because the frontend
 562                          * will reattach it without checking if already
 563                          * present...
 564                          */
 565                         ( void )ber_scanf( &ber, "x" /* [W] */ );
 566
 567                         ch_free( attr );
 568                         continue;
 569                 }
 570
 571                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
 572                                 || attr->a_vals == NULL )
 573                 {
 574                         /*
 575                          * Note: attr->a_vals can be null when using
 576                          * values result filter
 577                          */
 578                         attr->a_vals = (struct berval *)&slap_dummy_bv;
 579                         last = 0;
 580
 581                 } else {
 582                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); last++ )
 583                                 /* just count vals */ ;
 584                 }
 585
 586                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
 587                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
 588
 589                 if ( !validate && !pretty ) {
 590                         attr->a_nvals = NULL;
 591                         attr_free( attr );
 592                         goto next_attr;
 593                 }
 594
 595                 for ( i = 0; i < last; i++ ) {
 596                         struct berval   pval;
 597                         int             rc;
 598
 599                         if ( pretty ) {
 600                                 rc = pretty( attr->a_desc->ad_type->sat_syntax,
 601                                         &attr->a_vals[i], &pval, NULL );
 602
 603                         } else {
 604                                 rc = validate( attr->a_desc->ad_type->sat_syntax,
 605                                         &attr->a_vals[i] );
 606                         }
 607
 608                         if ( rc != LDAP_SUCCESS ) {
 609                                 /* check if, by chance, it's an undefined objectClass */
 610                                 if ( attr->a_desc == slap_schema.si_ad_objectClass &&
 611                                                 oc_bvfind_undef( &attr->a_vals[i] ) != NULL )
 612                                 {
 613                                         ber_dupbv( &pval, &attr->a_vals[i] );
 614
 615                                 } else {
 616                                         attr->a_nvals = NULL;
 617                                         attr_free( attr );
 618                                         goto next_attr;
 619                                 }
 620                         }
 621
 622                         if ( pretty ) {
 623                                 LBER_FREE( attr->a_vals[i].bv_val );
 624                                 attr->a_vals[i] = pval;
 625                         }
 626                 }
 627
 628                 if ( last && attr->a_desc->ad_type->sat_equality &&
 629                                 attr->a_desc->ad_type->sat_equality->smr_normalize )
 630                 {
 631                         attr->a_nvals = ch_malloc( ( last + 1 )*sizeof( struct berval ) );
 632                         for ( i = 0; i < last; i++ ) {
 633                                 int             rc;
 634
 635                                 /*
 636                                  * check that each value is valid per syntax
 637                                  * and pretty if appropriate
 638                                  */
 639                                 rc = attr->a_desc->ad_type->sat_equality->smr_normalize(
 640                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 641                                         attr->a_desc->ad_type->sat_syntax,
 642                                         attr->a_desc->ad_type->sat_equality,
 643                                         &attr->a_vals[i], &attr->a_nvals[i],
 644                                         NULL );
 645
 646                                 if ( rc != LDAP_SUCCESS ) {
 647                                         BER_BVZERO( &attr->a_nvals[i] );
 648                                         ch_free( attr );
 649                                         goto next_attr;
 650                                 }
 651                         }
 652                         BER_BVZERO( &attr->a_nvals[i] );
 653
 654                 } else {
 655                         attr->a_nvals = attr->a_vals;
 656                 }
 657                 *attrp = attr;
 658                 attrp = &attr->a_next;
 659
 660 next_attr:;
 661         }
 662
 663         return LDAP_SUCCESS;
 664 }
 665
 666 /* return 0 IFF we can retrieve the entry with ndn
 667  */
 668 int
 669 ldap_back_entry_get(
 670                 Operation               *op,
 671                 struct berval           *ndn,
 672                 ObjectClass             *oc,
 673                 AttributeDescription    *at,
 674                 int                     rw,
 675                 Entry                   **ent
 676 )
 677 {
 678         struct ldapconn *lc;
 679         int             rc = 1,
 680                         do_not_cache;
 681         struct berval   bdn;
 682         LDAPMessage     *result = NULL,
 683                         *e = NULL;
 684         char            *gattr[3];
 685         char            *filter = NULL;
 686         SlapReply       rs;
 687         int             do_retry = 1;
 688         LDAPControl     **ctrls = NULL;
 689
 690         /* Tell getconn this is a privileged op */
 691         do_not_cache = op->o_do_not_cache;
 692         op->o_do_not_cache = 1;
 693         lc = ldap_back_getconn( op, &rs, LDAP_BACK_DONTSEND );
 694         if ( !lc || !ldap_back_dobind( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 695                 op->o_do_not_cache = do_not_cache;
 696                 return rs.sr_err;
 697         }
 698         op->o_do_not_cache = do_not_cache;
 699
 700         if ( at ) {
 701                 if ( oc && at != slap_schema.si_ad_objectClass ) {
 702                         gattr[0] = slap_schema.si_ad_objectClass->ad_cname.bv_val;
 703                         gattr[1] = at->ad_cname.bv_val;
 704                         gattr[2] = NULL;
 705
 706                 } else {
 707                         gattr[0] = at->ad_cname.bv_val;
 708                         gattr[1] = NULL;
 709                 }
 710         }
 711
 712         if ( oc ) {
 713                 char    *ptr;
 714
 715                 filter = ch_malloc( STRLENOF( "(objectclass=)" )
 716                                 + oc->soc_cname.bv_len + 1 );
 717                 ptr = lutil_strcopy( filter, "(objectclass=" );
 718                 ptr = lutil_strcopy( ptr, oc->soc_cname.bv_val );
 719                 *ptr++ = ')';
 720                 *ptr++ = '\0';
 721         }
 722
 723         ctrls = op->o_ctrls;
 724         rc = ldap_back_proxy_authz_ctrl( lc, op, &rs, &ctrls );
 725         if ( rc != LDAP_SUCCESS ) {
 726                 goto cleanup;
 727         }
 728
 729 retry:
 730         rc = ldap_search_ext_s( lc->lc_ld, ndn->bv_val, LDAP_SCOPE_BASE, filter,
 731                                 at ? gattr : NULL, 0, ctrls, NULL,
 732                                 LDAP_NO_LIMIT, LDAP_NO_LIMIT, &result );
 733         if ( rc != LDAP_SUCCESS ) {
 734                 if ( rc == LDAP_SERVER_DOWN && do_retry ) {
 735                         do_retry = 0;
 736                         if ( ldap_back_retry( lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 737                                 goto retry;
 738                         }
 739                 }
 740                 goto cleanup;
 741         }
 742
 743         e = ldap_first_entry( lc->lc_ld, result );
 744         if ( e == NULL ) {
 745                 goto cleanup;
 746         }
 747
 748         *ent = ch_calloc( 1, sizeof( Entry ) );
 749
 750         rc = ldap_build_entry( op, e, *ent, &bdn );
 751
 752         if ( rc != LDAP_SUCCESS ) {
 753                 ch_free( *ent );
 754                 *ent = NULL;
 755         }
 756
 757 cleanup:
 758         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 759
 760         if ( result ) {
 761                 ldap_msgfree( result );
 762         }
 763
 764         if ( filter ) {
 765                 ch_free( filter );
 766         }
 767
 768         if ( lc != NULL ) {
 769                 ldap_back_release_conn( op, &rs, lc );
 770         }
 771
 772         return rc;
 773 }
 774