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