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 1999-2007 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         ldapinfo_t      *li = (ldapinfo_t *) 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 ( LDAP_BACK_T_F( li ) ) {
  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 ( LDAP_BACK_T_F( li ) ) {
  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         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 145
 146         ldapconn_t      *lc = NULL;
 147         struct timeval  tv;
 148         time_t          stoptime = (time_t)(-1);
 149         LDAPMessage     *res,
 150                         *e;
 151         int             rc = 0,
 152                         msgid;
 153         struct berval   match = BER_BVNULL,
 154                         filter = BER_BVNULL;
 155         int             free_filter = 0;
 156         int             i;
 157         char            **attrs = NULL;
 158         int             freetext = 0;
 159         int             do_retry = 1, dont_retry = 0;
 160         LDAPControl     **ctrls = NULL;
 161         char            **references = NULL;
 162
 163         /* FIXME: shouldn't this be null? */
 164         const char      *save_matched = rs->sr_matched;
 165
 166         if ( !ldap_back_dobind( &lc, op, rs, LDAP_BACK_SENDERR ) ) {
 167                 return rs->sr_err;
 168         }
 169
 170         /*
 171          * FIXME: in case of values return filter, we might want
 172          * to map attrs and maybe rewrite value
 173          */
 174
 175         /* should we check return values? */
 176         if ( op->ors_deref != -1 ) {
 177                 ldap_set_option( lc->lc_ld, LDAP_OPT_DEREF,
 178                                 (void *)&op->ors_deref );
 179         }
 180
 181         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 182                 tv.tv_sec = op->ors_tlimit;
 183                 tv.tv_usec = 0;
 184                 stoptime = op->o_time + op->ors_tlimit;
 185
 186         } else {
 187                 LDAP_BACK_TV_SET( &tv );
 188         }
 189
 190         if ( op->ors_attrs ) {
 191                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ )
 192                         /* just count attrs */ ;
 193
 194                 attrs = ch_malloc( ( i + 1 )*sizeof( char * ) );
 195                 if ( attrs == NULL ) {
 196                         rs->sr_err = LDAP_NO_MEMORY;
 197                         rc = -1;
 198                         goto finish;
 199                 }
 200
 201                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ ) {
 202                         attrs[ i ] = op->ors_attrs[i].an_name.bv_val;
 203                 }
 204                 attrs[ i ] = NULL;
 205         }
 206
 207         ctrls = op->o_ctrls;
 208         rc = ldap_back_controls_add( op, rs, lc, &ctrls );
 209         if ( rc != LDAP_SUCCESS ) {
 210                 goto finish;
 211         }
 212
 213         /* deal with <draft-zeilenga-ldap-t-f> filters */
 214         filter = op->ors_filterstr;
 215 retry:
 216         rs->sr_err = ldap_search_ext( lc->lc_ld, op->o_req_dn.bv_val,
 217                         op->ors_scope, filter.bv_val,
 218                         attrs, op->ors_attrsonly, ctrls, NULL,
 219                         tv.tv_sec ? &tv : NULL,
 220                         op->ors_slimit, &msgid );
 221
 222         if ( rs->sr_err != LDAP_SUCCESS ) {
 223                 switch ( rs->sr_err ) {
 224                 case LDAP_SERVER_DOWN:
 225                         if ( do_retry ) {
 226                                 do_retry = 0;
 227                                 if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_DONTSEND ) ) {
 228                                         goto retry;
 229                                 }
 230                         }
 231
 232                         if ( lc == NULL ) {
 233                                 /* reset by ldap_back_retry ... */
 234                                 rs->sr_err = slap_map_api2result( rs );
 235
 236                         } else {
 237                                 rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_DONTSEND );
 238                         }
 239
 240                         goto finish;
 241
 242                 case LDAP_FILTER_ERROR:
 243                         if ( ldap_back_munge_filter( op, &filter ) ) {
 244                                 free_filter = 1;
 245                                 goto retry;
 246                         }
 247
 248                         /* invalid filters return success with no data */
 249                         rs->sr_err = LDAP_SUCCESS;
 250                         rs->sr_text = NULL;
 251                         goto finish;
 252
 253                 default:
 254                         rs->sr_err = slap_map_api2result( rs );
 255                         rs->sr_text = NULL;
 256                         goto finish;
 257                 }
 258         }
 259
 260         /* if needed, initialize timeout */
 261         if ( li->li_timeout[ SLAP_OP_SEARCH ] ) {
 262                 if ( tv.tv_sec == 0 || tv.tv_sec > li->li_timeout[ SLAP_OP_SEARCH ] ) {
 263                         tv.tv_sec = li->li_timeout[ SLAP_OP_SEARCH ];
 264                         tv.tv_usec = 0;
 265                 }
 266         }
 267
 268         /* We pull apart the ber result, stuff it into a slapd entry, and
 269          * let send_search_entry stuff it back into ber format. Slow & ugly,
 270          * but this is necessary for version matching, and for ACL processing.
 271          */
 272
 273         for ( rc = -2; rc != -1; rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ONE, &tv, &res ) )
 274         {
 275                 /* check for abandon */
 276                 if ( op->o_abandon || LDAP_BACK_CONN_ABANDON( lc ) ) {
 277                         if ( rc > 0 ) {
 278                                 ldap_msgfree( res );
 279                         }
 280                         (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 281                         rc = SLAPD_ABANDON;
 282                         goto finish;
 283                 }
 284
 285                 if ( rc == 0 || rc == -2 ) {
 286                         ldap_pvt_thread_yield();
 287
 288                         /* check timeout */
 289                         if ( li->li_timeout[ SLAP_OP_SEARCH ] ) {
 290                                 if ( rc == 0 ) {
 291                                         (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 292                                         rs->sr_text = "Operation timed out";
 293                                         rc = rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
 294                                                 LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
 295                                         goto finish;
 296                                 }
 297
 298                         } else {
 299                                 LDAP_BACK_TV_SET( &tv );
 300                         }
 301
 302                         /* check time limit */
 303                         if ( op->ors_tlimit != SLAP_NO_LIMIT
 304                                         && slap_get_time() > stoptime )
 305                         {
 306                                 (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 307                                 rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 308                                 goto finish;
 309                         }
 310                         continue;
 311
 312                 } else {
 313                         /* only touch when activity actually took place... */
 314                         if ( li->li_idle_timeout && lc ) {
 315                                 lc->lc_time = op->o_time;
 316                         }
 317
 318                         /* don't retry any more */
 319                         dont_retry = 1;
 320                 }
 321
 322
 323                 if ( rc == LDAP_RES_SEARCH_ENTRY ) {
 324                         Entry           ent = { 0 };
 325                         struct berval   bdn = BER_BVNULL;
 326
 327                         do_retry = 0;
 328
 329                         e = ldap_first_entry( lc->lc_ld, res );
 330                         rc = ldap_build_entry( op, e, &ent, &bdn );
 331                         if ( rc == LDAP_SUCCESS ) {
 332                                 ldap_get_entry_controls( lc->lc_ld, res, &rs->sr_ctrls );
 333                                 rs->sr_entry = &ent;
 334                                 rs->sr_attrs = op->ors_attrs;
 335                                 rs->sr_operational_attrs = NULL;
 336                                 rs->sr_flags = 0;
 337                                 rs->sr_err = LDAP_SUCCESS;
 338                                 rc = rs->sr_err = send_search_entry( op, rs );
 339                                 if ( rs->sr_ctrls ) {
 340                                         ldap_controls_free( rs->sr_ctrls );
 341                                         rs->sr_ctrls = NULL;
 342                                 }
 343                                 rs->sr_entry = NULL;
 344                                 if ( !BER_BVISNULL( &ent.e_name ) ) {
 345                                         assert( ent.e_name.bv_val != bdn.bv_val );
 346                                         op->o_tmpfree( ent.e_name.bv_val, op->o_tmpmemctx );
 347                                         BER_BVZERO( &ent.e_name );
 348                                 }
 349                                 if ( !BER_BVISNULL( &ent.e_nname ) ) {
 350                                         op->o_tmpfree( ent.e_nname.bv_val, op->o_tmpmemctx );
 351                                         BER_BVZERO( &ent.e_nname );
 352                                 }
 353                                 entry_clean( &ent );
 354                         }
 355                         ldap_msgfree( res );
 356                         if ( rc != LDAP_SUCCESS ) {
 357                                 if ( rc == LDAP_UNAVAILABLE ) {
 358                                         rc = rs->sr_err = LDAP_OTHER;
 359                                 } else {
 360                                         (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 361                                 }
 362                                 goto finish;
 363                         }
 364
 365                 } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
 366                         do_retry = 0;
 367                         rc = ldap_parse_reference( lc->lc_ld, res,
 368                                         &references, &rs->sr_ctrls, 1 );
 369
 370                         if ( rc != LDAP_SUCCESS ) {
 371                                 continue;
 372                         }
 373
 374                         /* FIXME: there MUST be at least one */
 375                         if ( references && references[ 0 ] && references[ 0 ][ 0 ] ) {
 376                                 int             cnt;
 377
 378                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 379                                         /* NO OP */ ;
 380
 381                                 /* FIXME: there MUST be at least one */
 382                                 rs->sr_ref = op->o_tmpalloc( ( cnt + 1 ) * sizeof( struct berval ),
 383                                         op->o_tmpmemctx );
 384
 385                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 386                                         ber_str2bv( references[ cnt ], 0, 0, &rs->sr_ref[ cnt ] );
 387                                 }
 388                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 389
 390                                 /* ignore return value by now */
 391                                 rs->sr_entry = NULL;
 392                                 ( void )send_search_reference( op, rs );
 393
 394                         } else {
 395                                 Debug( LDAP_DEBUG_ANY,
 396                                         "%s ldap_back_search: "
 397                                         "got SEARCH_REFERENCE "
 398                                         "with no referrals\n",
 399                                         op->o_log_prefix, 0, 0 );
 400                         }
 401
 402                         /* cleanup */
 403                         if ( references ) {
 404                                 ber_memvfree( (void **)references );
 405                                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
 406                                 rs->sr_ref = NULL;
 407                                 references = NULL;
 408                         }
 409
 410                         if ( rs->sr_ctrls ) {
 411                                 ldap_controls_free( rs->sr_ctrls );
 412                                 rs->sr_ctrls = NULL;
 413                         }
 414
 415                 } else {
 416                         char            *err = NULL;
 417
 418                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 419                                         &match.bv_val, &err,
 420                                         &references, &rs->sr_ctrls, 1 );
 421                         if ( rc != LDAP_SUCCESS ) {
 422                                 rs->sr_err = rc;
 423                         }
 424                         rs->sr_err = slap_map_api2result( rs );
 425                         if ( err ) {
 426                                 rs->sr_text = err;
 427                                 freetext = 1;
 428                         }
 429
 430                         /* RFC 4511: referrals can only appear
 431                          * if result code is LDAP_REFERRAL */
 432                         if ( references
 433                                 && references[ 0 ]
 434                                 && references[ 0 ][ 0 ] )
 435                         {
 436                                 if ( rs->sr_err != LDAP_REFERRAL ) {
 437                                         Debug( LDAP_DEBUG_ANY,
 438                                                 "%s ldap_back_search: "
 439                                                 "got referrals with err=%d\n",
 440                                                 op->o_log_prefix,
 441                                                 rs->sr_err, 0 );
 442
 443                                 } else {
 444                                         int     cnt;
 445
 446                                         for ( cnt = 0; references[ cnt ]; cnt++ )
 447                                                 /* NO OP */ ;
 448
 449                                         rs->sr_ref = op->o_tmpalloc( ( cnt + 1 ) * sizeof( struct berval ),
 450                                                 op->o_tmpmemctx );
 451
 452                                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
 453                                                 /* duplicating ...*/
 454                                                 ber_str2bv( references[ cnt ], 0, 0, &rs->sr_ref[ cnt ] );
 455                                         }
 456                                         BER_BVZERO( &rs->sr_ref[ cnt ] );
 457                                 }
 458
 459                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 460                                 Debug( LDAP_DEBUG_ANY,
 461                                         "%s ldap_back_search: "
 462                                         "got err=%d with null "
 463                                         "or empty referrals\n",
 464                                         op->o_log_prefix,
 465                                         rs->sr_err, 0 );
 466
 467                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 468                         }
 469
 470                         if ( match.bv_val != NULL ) {
 471                                 match.bv_len = strlen( match.bv_val );
 472                         }
 473
 474                         rc = 0;
 475                         break;
 476                 }
 477
 478                 /* if needed, restore timeout */
 479                 if ( li->li_timeout[ SLAP_OP_SEARCH ] ) {
 480                         if ( tv.tv_sec == 0 || tv.tv_sec > li->li_timeout[ SLAP_OP_SEARCH ] ) {
 481                                 tv.tv_sec = li->li_timeout[ SLAP_OP_SEARCH ];
 482                                 tv.tv_usec = 0;
 483                         }
 484                 }
 485         }
 486
 487         if ( rc == -1 && dont_retry == 0 ) {
 488                 if ( do_retry ) {
 489                         do_retry = 0;
 490                         if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_DONTSEND ) ) {
 491                                 goto retry;
 492                         }
 493                 }
 494                 rs->sr_err = LDAP_SERVER_DOWN;
 495                 rs->sr_err = slap_map_api2result( rs );
 496                 goto finish;
 497         }
 498
 499         /*
 500          * Rewrite the matched portion of the search base, if required
 501          */
 502         if ( !BER_BVISNULL( &match ) && !BER_BVISEMPTY( &match ) ) {
 503                 struct berval   pmatch;
 504
 505                 if ( dnPretty( NULL, &match, &pmatch, op->o_tmpmemctx ) == LDAP_SUCCESS ) {
 506                         rs->sr_matched = pmatch.bv_val;
 507                         LDAP_FREE( match.bv_val );
 508
 509                 } else {
 510                         rs->sr_matched = match.bv_val;
 511                 }
 512         }
 513
 514         if ( rs->sr_v2ref ) {
 515                 rs->sr_err = LDAP_REFERRAL;
 516         }
 517
 518 finish:;
 519         if ( LDAP_BACK_QUARANTINE( li ) ) {
 520                 ldap_back_quarantine( op, rs );
 521         }
 522
 523 #if 0
 524         /* let send_ldap_result play cleanup handlers (ITS#4645) */
 525         if ( rc != SLAPD_ABANDON )
 526 #endif
 527         {
 528                 send_ldap_result( op, rs );
 529         }
 530
 531         (void)ldap_back_controls_free( op, rs, &ctrls );
 532
 533         if ( rs->sr_ctrls ) {
 534                 ldap_controls_free( rs->sr_ctrls );
 535                 rs->sr_ctrls = NULL;
 536         }
 537
 538         if ( rs->sr_matched != NULL && rs->sr_matched != save_matched ) {
 539                 if ( rs->sr_matched != match.bv_val ) {
 540                         ber_memfree_x( (char *)rs->sr_matched, op->o_tmpmemctx );
 541
 542                 } else {
 543                         LDAP_FREE( match.bv_val );
 544                 }
 545                 rs->sr_matched = save_matched;
 546         }
 547
 548         if ( free_filter ) {
 549                 op->o_tmpfree( filter.bv_val, op->o_tmpmemctx );
 550         }
 551
 552         if ( rs->sr_text ) {
 553                 if ( freetext ) {
 554                         LDAP_FREE( (char *)rs->sr_text );
 555                 }
 556                 rs->sr_text = NULL;
 557         }
 558
 559         if ( rs->sr_ref ) {
 560                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
 561                 rs->sr_ref = NULL;
 562         }
 563
 564         if ( references ) {
 565                 ber_memvfree( (void **)references );
 566         }
 567
 568         if ( attrs ) {
 569                 ch_free( attrs );
 570         }
 571
 572         if ( lc != NULL ) {
 573                 ldap_back_release_conn( li, lc );
 574         }
 575
 576         return rs->sr_err;
 577 }
 578
 579 static int
 580 ldap_build_entry(
 581                 Operation       *op,
 582                 LDAPMessage     *e,
 583                 Entry           *ent,
 584                 struct berval   *bdn )
 585 {
 586         struct berval   a;
 587         BerElement      ber = *e->lm_ber;
 588         Attribute       *attr, **attrp;
 589         const char      *text;
 590         int             last;
 591         char *lastb;
 592         ber_len_t len;
 593
 594         /* safe assumptions ... */
 595         assert( ent != NULL );
 596         BER_BVZERO( &ent->e_bv );
 597
 598         if ( ber_scanf( &ber, "{m", bdn ) == LBER_ERROR ) {
 599                 return LDAP_DECODING_ERROR;
 600         }
 601
 602         /*
 603          * Note: this may fail if the target host(s) schema differs
 604          * from the one known to the meta, and a DN with unknown
 605          * attributes is returned.
 606          *
 607          * FIXME: should we log anything, or delegate to dnNormalize?
 608          */
 609         /* Note: if the distinguished values or the naming attributes
 610          * change, should we massage them as well?
 611          */
 612         if ( dnPrettyNormal( NULL, bdn, &ent->e_name, &ent->e_nname,
 613                 op->o_tmpmemctx ) != LDAP_SUCCESS )
 614         {
 615                 return LDAP_INVALID_DN_SYNTAX;
 616         }
 617
 618         ent->e_attrs = NULL;
 619         if ( ber_first_element( &ber, &len, &lastb ) != LBER_SEQUENCE ) {
 620                 return LDAP_SUCCESS;
 621         }
 622
 623         attrp = &ent->e_attrs;
 624         while ( ber_next_element( &ber, &len, lastb ) == LBER_SEQUENCE &&
 625                 ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
 626                 int                             i;
 627                 slap_syntax_validate_func       *validate;
 628                 slap_syntax_transform_func      *pretty;
 629
 630                 attr = attr_alloc( NULL );
 631                 if ( attr == NULL ) {
 632                         continue;
 633                 }
 634                 if ( slap_bv2ad( &a, &attr->a_desc, &text )
 635                                 != LDAP_SUCCESS )
 636                 {
 637                         if ( slap_bv2undef_ad( &a, &attr->a_desc, &text,
 638                                 SLAP_AD_PROXIED ) != LDAP_SUCCESS )
 639                         {
 640                                 Debug( LDAP_DEBUG_ANY,
 641                                         "%s ldap_build_entry: "
 642                                         "slap_bv2undef_ad(%s): %s\n",
 643                                         op->o_log_prefix, a.bv_val, text );
 644                                 attr_free( attr );
 645                                 continue;
 646                         }
 647                 }
 648
 649                 /* no subschemaSubentry */
 650                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
 651                         || attr->a_desc == slap_schema.si_ad_entryDN )
 652                 {
 653
 654                         /*
 655                          * We eat target's subschemaSubentry because
 656                          * a search for this value is likely not
 657                          * to resolve to the appropriate backend;
 658                          * later, the local subschemaSubentry is
 659                          * added.
 660                          *
 661                          * We also eat entryDN because the frontend
 662                          * will reattach it without checking if already
 663                          * present...
 664                          */
 665                         ( void )ber_scanf( &ber, "x" /* [W] */ );
 666
 667                         attr_free( attr );
 668                         continue;
 669                 }
 670
 671                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
 672                                 || attr->a_vals == NULL )
 673                 {
 674                         /*
 675                          * Note: attr->a_vals can be null when using
 676                          * values result filter
 677                          */
 678                         attr->a_vals = (struct berval *)&slap_dummy_bv;
 679                         last = 0;
 680
 681                 } else {
 682                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); last++ )
 683                                 /* just count vals */ ;
 684                 }
 685
 686                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
 687                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
 688
 689                 if ( !validate && !pretty ) {
 690                         attr->a_nvals = NULL;
 691                         attr_free( attr );
 692                         goto next_attr;
 693                 }
 694
 695                 for ( i = 0; i < last; i++ ) {
 696                         struct berval   pval;
 697                         int             rc;
 698
 699                         if ( pretty ) {
 700                                 rc = pretty( attr->a_desc->ad_type->sat_syntax,
 701                                         &attr->a_vals[i], &pval, NULL );
 702
 703                         } else {
 704                                 rc = validate( attr->a_desc->ad_type->sat_syntax,
 705                                         &attr->a_vals[i] );
 706                         }
 707
 708                         if ( rc != LDAP_SUCCESS ) {
 709                                 /* check if, by chance, it's an undefined objectClass */
 710                                 if ( attr->a_desc == slap_schema.si_ad_objectClass &&
 711                                                 oc_bvfind_undef( &attr->a_vals[i] ) != NULL )
 712                                 {
 713                                         ber_dupbv( &pval, &attr->a_vals[i] );
 714
 715                                 } else {
 716                                         attr->a_nvals = NULL;
 717                                         attr_free( attr );
 718                                         goto next_attr;
 719                                 }
 720                         }
 721
 722                         if ( pretty ) {
 723                                 LBER_FREE( attr->a_vals[i].bv_val );
 724                                 attr->a_vals[i] = pval;
 725                         }
 726                 }
 727
 728                 if ( last && attr->a_desc->ad_type->sat_equality &&
 729                                 attr->a_desc->ad_type->sat_equality->smr_normalize )
 730                 {
 731                         attr->a_nvals = ch_malloc( ( last + 1 )*sizeof( struct berval ) );
 732                         for ( i = 0; i < last; i++ ) {
 733                                 int             rc;
 734
 735                                 /*
 736                                  * check that each value is valid per syntax
 737                                  * and pretty if appropriate
 738                                  */
 739                                 rc = attr->a_desc->ad_type->sat_equality->smr_normalize(
 740                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 741                                         attr->a_desc->ad_type->sat_syntax,
 742                                         attr->a_desc->ad_type->sat_equality,
 743                                         &attr->a_vals[i], &attr->a_nvals[i],
 744                                         NULL );
 745
 746                                 if ( rc != LDAP_SUCCESS ) {
 747                                         BER_BVZERO( &attr->a_nvals[i] );
 748                                         attr_free( attr );
 749                                         goto next_attr;
 750                                 }
 751                         }
 752                         BER_BVZERO( &attr->a_nvals[i] );
 753
 754                 } else {
 755                         attr->a_nvals = attr->a_vals;
 756                 }
 757                 *attrp = attr;
 758                 attrp = &attr->a_next;
 759
 760 next_attr:;
 761         }
 762
 763         return LDAP_SUCCESS;
 764 }
 765
 766 /* return 0 IFF we can retrieve the entry with ndn
 767  */
 768 int
 769 ldap_back_entry_get(
 770                 Operation               *op,
 771                 struct berval           *ndn,
 772                 ObjectClass             *oc,
 773                 AttributeDescription    *at,
 774                 int                     rw,
 775                 Entry                   **ent )
 776 {
 777         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 778
 779         ldapconn_t      *lc = NULL;
 780         int             rc = 1,
 781                         do_not_cache;
 782         struct berval   bdn;
 783         LDAPMessage     *result = NULL,
 784                         *e = NULL;
 785         char            *attr[3], **attrp = NULL;
 786         char            *filter = NULL;
 787         SlapReply       rs;
 788         int             do_retry = 1;
 789         LDAPControl     **ctrls = NULL;
 790
 791         *ent = NULL;
 792
 793         /* Tell getconn this is a privileged op */
 794         do_not_cache = op->o_do_not_cache;
 795         op->o_do_not_cache = 1;
 796         if ( !ldap_back_dobind( &lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 797                 op->o_do_not_cache = do_not_cache;
 798                 return rs.sr_err;
 799         }
 800         op->o_do_not_cache = do_not_cache;
 801
 802         if ( at ) {
 803                 attrp = attr;
 804                 if ( oc && at != slap_schema.si_ad_objectClass ) {
 805                         attr[0] = slap_schema.si_ad_objectClass->ad_cname.bv_val;
 806                         attr[1] = at->ad_cname.bv_val;
 807                         attr[2] = NULL;
 808
 809                 } else {
 810                         attr[0] = at->ad_cname.bv_val;
 811                         attr[1] = NULL;
 812                 }
 813         }
 814
 815         if ( oc ) {
 816                 char    *ptr;
 817
 818                 filter = op->o_tmpalloc( STRLENOF( "(objectClass=" ")" )
 819                                 + oc->soc_cname.bv_len + 1, op->o_tmpmemctx );
 820                 ptr = lutil_strcopy( filter, "(objectClass=" );
 821                 ptr = lutil_strcopy( ptr, oc->soc_cname.bv_val );
 822                 *ptr++ = ')';
 823                 *ptr++ = '\0';
 824         }
 825
 826 retry:
 827         ctrls = op->o_ctrls;
 828         rc = ldap_back_controls_add( op, &rs, lc, &ctrls );
 829         if ( rc != LDAP_SUCCESS ) {
 830                 goto cleanup;
 831         }
 832
 833         /* TODO: timeout? */
 834         rc = ldap_search_ext_s( lc->lc_ld, ndn->bv_val, LDAP_SCOPE_BASE, filter,
 835                                 attrp, 0, ctrls, NULL,
 836                                 NULL, LDAP_NO_LIMIT, &result );
 837         if ( rc != LDAP_SUCCESS ) {
 838                 if ( rc == LDAP_SERVER_DOWN && do_retry ) {
 839                         do_retry = 0;
 840                         if ( ldap_back_retry( &lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 841                                 /* if the identity changed, there might be need to re-authz */
 842                                 (void)ldap_back_controls_free( op, &rs, &ctrls );
 843                                 goto retry;
 844                         }
 845                 }
 846                 goto cleanup;
 847         }
 848
 849         e = ldap_first_entry( lc->lc_ld, result );
 850         if ( e == NULL ) {
 851                 /* the entry exists, but it doesn't match the filter? */
 852                 goto cleanup;
 853         }
 854
 855         *ent = entry_alloc();
 856         if ( *ent == NULL ) {
 857                 rc = LDAP_NO_MEMORY;
 858                 goto cleanup;
 859         }
 860
 861         rc = ldap_build_entry( op, e, *ent, &bdn );
 862
 863         if ( rc != LDAP_SUCCESS ) {
 864                 entry_free( *ent );
 865                 *ent = NULL;
 866         }
 867
 868 cleanup:
 869         (void)ldap_back_controls_free( op, &rs, &ctrls );
 870
 871         if ( result ) {
 872                 ldap_msgfree( result );
 873         }
 874
 875         if ( filter ) {
 876                 op->o_tmpfree( filter, op->o_tmpmemctx );
 877         }
 878
 879         if ( lc != NULL ) {
 880                 ldap_back_release_conn( li, lc );
 881         }
 882
 883         return rc;
 884 }
 885