git.sur5r.net Git - openldap/blob - servers/slapd/back-meta/search.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1999-2007 The OpenLDAP Foundation.
   5  * Portions Copyright 2001-2003 Pierangelo Masarati.
   6  * Portions Copyright 1999-2003 Howard Chu.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by the Howard Chu for inclusion
  19  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  20  * Masarati.
  21  */
  22
  23 #include "portable.h"
  24
  25 #include <stdio.h>
  26
  27 #include <ac/socket.h>
  28 #include <ac/string.h>
  29 #include <ac/time.h>
  30
  31 #include "lutil.h"
  32 #include "slap.h"
  33 #include "../back-ldap/back-ldap.h"
  34 #include "back-meta.h"
  35 #undef ldap_debug       /* silence a warning in ldap-int.h */
  36 #include "ldap_log.h"
  37 #include "../../../libraries/libldap/ldap-int.h"
  38
  39 /* IGNORE means that target does not (no longer) participate
  40  * in the search;
  41  * NOTREADY means the search on that target has not been initialized yet
  42  */
  43 #define META_MSGID_IGNORE       (-1)
  44 #define META_MSGID_NEED_BIND    (-2)
  45
  46 static int
  47 meta_send_entry(
  48         Operation       *op,
  49         SlapReply       *rs,
  50         metaconn_t      *mc,
  51         int             i,
  52         LDAPMessage     *e );
  53
  54 typedef enum meta_search_candidate_t {
  55         META_SEARCH_UNDEFINED = -2,
  56         META_SEARCH_ERR = -1,
  57         META_SEARCH_NOT_CANDIDATE,
  58         META_SEARCH_CANDIDATE,
  59         META_SEARCH_BINDING,
  60         META_SEARCH_NEED_BIND
  61 } meta_search_candidate_t;
  62
  63 /*
  64  * meta_search_dobind_init()
  65  *
  66  * initiates bind for a candidate target of a search.
  67  */
  68 static meta_search_candidate_t
  69 meta_search_dobind_init(
  70         Operation               *op,
  71         SlapReply               *rs,
  72         metaconn_t              **mcp,
  73         int                     candidate,
  74         SlapReply               *candidates )
  75 {
  76         metaconn_t              *mc = *mcp;
  77         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
  78         metatarget_t            *mt = mi->mi_targets[ candidate ];
  79         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
  80
  81         struct berval           binddn = msc->msc_bound_ndn,
  82                                 cred = msc->msc_cred;
  83         int                     method;
  84
  85         int                     rc;
  86
  87         meta_search_candidate_t retcode;
  88
  89         Debug( LDAP_DEBUG_TRACE, "%s >>> meta_search_dobind_init[%d]\n",
  90                 op->o_log_prefix, candidate, 0 );
  91
  92         /*
  93          * all the targets are already bound as pseudoroot
  94          */
  95         if ( mc->mc_authz_target == META_BOUND_ALL ) {
  96                 return META_SEARCH_CANDIDATE;
  97         }
  98
  99         retcode = META_SEARCH_BINDING;
 100         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 101         if ( LDAP_BACK_CONN_ISBOUND( msc ) || LDAP_BACK_CONN_ISANON( msc ) ) {
 102                 /* already bound (or anonymous) */
 103
 104 #ifdef DEBUG_205
 105                 char    buf[ SLAP_TEXT_BUFLEN ] = { '\0' };
 106                 int     bound = 0;
 107
 108                 if ( LDAP_BACK_CONN_ISBOUND( msc ) ) {
 109                         bound = 1;
 110                 }
 111
 112                 snprintf( buf, sizeof( buf ), " mc=%p ld=%p%s DN=\"%s\"",
 113                         (void *)mc, (void *)msc->msc_ld,
 114                         bound ? " bound" : " anonymous",
 115                         bound == 0 ? "" : msc->msc_bound_ndn.bv_val );
 116                 Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
 117                         op->o_log_prefix, candidate, buf );
 118 #endif /* DEBUG_205 */
 119
 120                 retcode = META_SEARCH_CANDIDATE;
 121
 122         } else if ( META_BACK_CONN_CREATING( msc ) || LDAP_BACK_CONN_BINDING( msc ) ) {
 123                 /* another thread is binding the target for this conn; wait */
 124
 125 #ifdef DEBUG_205
 126                 char    buf[ SLAP_TEXT_BUFLEN ] = { '\0' };
 127
 128                 snprintf( buf, sizeof( buf ), " mc=%p ld=%p needbind",
 129                         (void *)mc, (void *)msc->msc_ld );
 130                 Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
 131                         op->o_log_prefix, candidate, buf );
 132 #endif /* DEBUG_205 */
 133
 134                 candidates[ candidate ].sr_msgid = META_MSGID_NEED_BIND;
 135                 retcode = META_SEARCH_NEED_BIND;
 136
 137         } else {
 138                 /* we'll need to bind the target for this conn */
 139
 140 #ifdef DEBUG_205
 141                 char buf[ SLAP_TEXT_BUFLEN ];
 142
 143                 snprintf( buf, sizeof( buf ), " mc=%p ld=%p binding",
 144                         (void *)mc, (void *)msc->msc_ld );
 145                 Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
 146                         op->o_log_prefix, candidate, buf );
 147 #endif /* DEBUG_205 */
 148
 149                 if ( msc->msc_ld == NULL ) {
 150                         /* for some reason (e.g. because formerly in "binding"
 151                          * state, with eventual connection expiration or invalidation)
 152                          * it was not initialized as expected */
 153
 154                         Debug( LDAP_DEBUG_ANY, "%s meta_search_dobind_init[%d] mc=%p ld=NULL\n",
 155                                 op->o_log_prefix, candidate, (void *)mc );
 156
 157                         rc = meta_back_init_one_conn( op, rs, *mcp, candidate,
 158                                 LDAP_BACK_CONN_ISPRIV( *mcp ), LDAP_BACK_DONTSEND, 0 );
 159                         switch ( rc ) {
 160                         case LDAP_SUCCESS:
 161                                 assert( msc->msc_ld != NULL );
 162                                 break;
 163
 164                         case LDAP_SERVER_DOWN:
 165                         case LDAP_UNAVAILABLE:
 166                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 167                                 goto down;
 168
 169                         default:
 170                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 171                                 goto other;
 172                         }
 173                 }
 174
 175                 LDAP_BACK_CONN_BINDING_SET( msc );
 176         }
 177
 178         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 179
 180         if ( retcode != META_SEARCH_BINDING ) {
 181                 return retcode;
 182         }
 183
 184         /* NOTE: this obsoletes pseudorootdn */
 185         if ( op->o_conn != NULL &&
 186                 !op->o_do_not_cache &&
 187                 ( BER_BVISNULL( &msc->msc_bound_ndn ) ||
 188                         BER_BVISEMPTY( &msc->msc_bound_ndn ) ||
 189                         ( mt->mt_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 190         {
 191                 rc = meta_back_proxy_authz_cred( mc, candidate, op, rs, LDAP_BACK_DONTSEND, &binddn, &cred, &method );
 192                 if ( rc != LDAP_SUCCESS ) {
 193                         goto down;
 194                 }
 195
 196                 /* NOTE: we copy things here, even if bind didn't succeed yet,
 197                  * because the connection is not shared until bind is over */
 198                 if ( !BER_BVISNULL( &binddn ) ) {
 199                         ber_bvreplace( &msc->msc_bound_ndn, &binddn );
 200                         if ( LDAP_BACK_SAVECRED( mi ) && !BER_BVISNULL( &cred ) ) {
 201                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 202                                         memset( msc->msc_cred.bv_val, 0,
 203                                                 msc->msc_cred.bv_len );
 204                                 }
 205                                 ber_bvreplace( &msc->msc_cred, &cred );
 206                         }
 207                 }
 208
 209                 if ( LDAP_BACK_CONN_ISBOUND( msc ) ) {
 210                         /* apparently, idassert was configured with SASL bind,
 211                          * so bind occurred inside meta_back_proxy_authz_cred() */
 212                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 213                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 214                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 215                         return META_SEARCH_CANDIDATE;
 216                 }
 217
 218                 /* paranoid */
 219                 switch ( method ) {
 220                 case LDAP_AUTH_NONE:
 221                 case LDAP_AUTH_SIMPLE:
 222                         /* do a simple bind with binddn, cred */
 223                         break;
 224
 225                 default:
 226                         assert( 0 );
 227                         break;
 228                 }
 229         }
 230
 231         assert( msc->msc_ld != NULL );
 232
 233         /* connect must be async */
 234 retry:;
 235         ldap_set_option( msc->msc_ld, LDAP_OPT_CONNECT_ASYNC, LDAP_OPT_ON );
 236
 237         rc = ldap_sasl_bind( msc->msc_ld, binddn.bv_val, LDAP_SASL_SIMPLE, &cred,
 238                         NULL, NULL, &candidates[ candidate ].sr_msgid );
 239
 240 #ifdef DEBUG_205
 241         {
 242                 char buf[ SLAP_TEXT_BUFLEN ];
 243
 244                 snprintf( buf, sizeof( buf ), "meta_search_dobind_init[%d] mc=%p ld=%p rc=%d",
 245                         candidate, (void *)mc, (void *)mc->mc_conns[ candidate ].msc_ld, rc );
 246                 Debug( LDAP_DEBUG_ANY, "### %s %s\n",
 247                         op->o_log_prefix, buf, 0 );
 248         }
 249 #endif /* DEBUG_205 */
 250
 251         switch ( rc ) {
 252         case LDAP_SUCCESS:
 253                 assert( candidates[ candidate ].sr_msgid >= 0 );
 254                 META_BINDING_SET( &candidates[ candidate ] );
 255                 return META_SEARCH_BINDING;
 256
 257         case LDAP_X_CONNECTING:
 258                 /* must retry, same conn */
 259                 candidates[ candidate ].sr_msgid = META_MSGID_NEED_BIND;
 260                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 261                 LDAP_BACK_CONN_BINDING_CLEAR( msc );
 262                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 263                 return META_SEARCH_NEED_BIND;
 264
 265         case LDAP_SERVER_DOWN:
 266 down:;
 267                 /* This is the worst thing that could happen:
 268                  * the search will wait until the retry is over. */
 269                 if ( !META_IS_RETRYING( &candidates[ candidate ] ) ) {
 270                         META_RETRYING_SET( &candidates[ candidate ] );
 271
 272                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 273
 274                         assert( mc->mc_refcnt > 0 );
 275                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
 276                                 char    buf[ SLAP_TEXT_BUFLEN ];
 277
 278                                 /* this lock is required; however,
 279                                  * it's invoked only when logging is on */
 280                                 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 281                                 snprintf( buf, sizeof( buf ),
 282                                         "retrying URI=\"%s\" DN=\"%s\"",
 283                                         mt->mt_uri,
 284                                         BER_BVISNULL( &msc->msc_bound_ndn ) ?
 285                                                 "" : msc->msc_bound_ndn.bv_val );
 286                                 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 287
 288                                 Debug( LDAP_DEBUG_ANY,
 289                                         "%s meta_search_dobind_init[%d]: %s.\n",
 290                                         op->o_log_prefix, candidate, buf );
 291                         }
 292
 293                         meta_clear_one_candidate( op, mc, candidate );
 294                         LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 295
 296                         ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 297
 298                         /* mc here must be the regular mc, reset and ready for init */
 299                         rc = meta_back_init_one_conn( op, rs, mc, candidate,
 300                                 LDAP_BACK_CONN_ISPRIV( mc ), LDAP_BACK_DONTSEND, 0 );
 301
 302                         if ( rc == LDAP_SUCCESS ) {
 303                                 LDAP_BACK_CONN_BINDING_SET( msc );
 304                         }
 305
 306                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 307
 308                         if ( rc == LDAP_SUCCESS ) {
 309                                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 310                                 goto retry;
 311                         }
 312                 }
 313
 314                 if ( *mcp == NULL ) {
 315                         retcode = META_SEARCH_ERR;
 316                         rs->sr_err = LDAP_UNAVAILABLE;
 317                         break;
 318                 }
 319                 /* fall thru */
 320
 321         default:
 322 other:;
 323                 rs->sr_err = rc;
 324                 rc = slap_map_api2result( rs );
 325
 326                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 327                 meta_clear_one_candidate( op, mc, candidate );
 328                 candidates[ candidate ].sr_err = rc;
 329                 if ( META_BACK_ONERR_STOP( mi ) ) {
 330                         LDAP_BACK_CONN_TAINTED_SET( mc );
 331                         meta_back_release_conn_lock( op, mc, 0 );
 332                         *mcp = NULL;
 333                         rs->sr_err = rc;
 334
 335                         retcode = META_SEARCH_ERR;
 336
 337                 } else {
 338                         retcode = META_SEARCH_NOT_CANDIDATE;
 339                 }
 340                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 341                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 342                 break;
 343         }
 344
 345         return retcode;
 346 }
 347
 348 static meta_search_candidate_t
 349 meta_search_dobind_result(
 350         Operation               *op,
 351         SlapReply               *rs,
 352         metaconn_t              **mcp,
 353         int                     candidate,
 354         SlapReply               *candidates,
 355         LDAPMessage             *res )
 356 {
 357         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 358         metaconn_t              *mc = *mcp;
 359         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 360
 361         meta_search_candidate_t retcode = META_SEARCH_NOT_CANDIDATE;
 362         int                     rc;
 363
 364         assert( msc->msc_ld != NULL );
 365
 366         /* FIXME: matched? referrals? response controls? */
 367         rc = ldap_parse_result( msc->msc_ld, res,
 368                 &candidates[ candidate ].sr_err,
 369                 NULL, NULL, NULL, NULL, 0 );
 370         if ( rc != LDAP_SUCCESS ) {
 371                 candidates[ candidate ].sr_err = rc;
 372
 373         } else {
 374                 rc = slap_map_api2result( &candidates[ candidate ] );
 375         }
 376
 377         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 378         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 379         if ( rc != LDAP_SUCCESS ) {
 380                 meta_clear_one_candidate( op, mc, candidate );
 381                 candidates[ candidate ].sr_err = rc;
 382                 if ( META_BACK_ONERR_STOP( mi ) ) {
 383                         LDAP_BACK_CONN_TAINTED_SET( mc );
 384                         meta_back_release_conn_lock( op, mc, 0 );
 385                         *mcp = NULL;
 386                         retcode = META_SEARCH_ERR;
 387                         rs->sr_err = rc;
 388                 }
 389
 390         } else {
 391                 /* FIXME: check if bound as idassert authcDN! */
 392                 if ( BER_BVISNULL( &msc->msc_bound_ndn )
 393                         || BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 394                 {
 395                         LDAP_BACK_CONN_ISANON_SET( msc );
 396
 397                 } else {
 398                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 399                 }
 400                 retcode = META_SEARCH_CANDIDATE;
 401
 402                 /* connect must be async */
 403                 ldap_set_option( msc->msc_ld, LDAP_OPT_CONNECT_ASYNC, LDAP_OPT_OFF );
 404         }
 405
 406         candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 407         META_BINDING_CLEAR( &candidates[ candidate ] );
 408
 409         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 410
 411         return retcode;
 412 }
 413
 414 static meta_search_candidate_t
 415 meta_back_search_start(
 416         Operation               *op,
 417         SlapReply               *rs,
 418         dncookie                *dc,
 419         metaconn_t              **mcp,
 420         int                     candidate,
 421         SlapReply               *candidates )
 422 {
 423         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 424         metatarget_t            *mt = mi->mi_targets[ candidate ];
 425         metasingleconn_t        *msc = &(*mcp)->mc_conns[ candidate ];
 426         struct berval           realbase = op->o_req_dn;
 427         int                     realscope = op->ors_scope;
 428         struct berval           mbase = BER_BVNULL;
 429         struct berval           mfilter = BER_BVNULL;
 430         char                    **mapped_attrs = NULL;
 431         int                     rc;
 432         meta_search_candidate_t retcode;
 433         struct timeval          tv, *tvp = NULL;
 434         int                     nretries = 1;
 435         LDAPControl             **ctrls = NULL;
 436
 437         /* this should not happen; just in case... */
 438         if ( msc->msc_ld == NULL ) {
 439                 Debug( LDAP_DEBUG_ANY,
 440                         "%s: meta_back_search_start candidate=%d ld=NULL%s.\n",
 441                         op->o_log_prefix, candidate,
 442                         META_BACK_ONERR_STOP( mi ) ? "" : " (ignored)" );
 443                 candidates[ candidate ].sr_err = LDAP_OTHER;
 444                 if ( META_BACK_ONERR_STOP( mi ) ) {
 445                         return META_SEARCH_ERR;
 446                 }
 447                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 448                 return META_SEARCH_NOT_CANDIDATE;
 449         }
 450
 451         Debug( LDAP_DEBUG_TRACE, "%s >>> meta_back_search_start[%d]\n", op->o_log_prefix, candidate, 0 );
 452
 453         /*
 454          * modifies the base according to the scope, if required
 455          */
 456         if ( mt->mt_nsuffix.bv_len > op->o_req_ndn.bv_len ) {
 457                 switch ( op->ors_scope ) {
 458                 case LDAP_SCOPE_SUBTREE:
 459                         /*
 460                          * make the target suffix the new base
 461                          * FIXME: this is very forgiving, because
 462                          * "illegal" searchBases may be turned
 463                          * into the suffix of the target; however,
 464                          * the requested searchBase already passed
 465                          * thru the candidate analyzer...
 466                          */
 467                         if ( dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) ) {
 468                                 realbase = mt->mt_nsuffix;
 469                                 if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 470                                         realscope = LDAP_SCOPE_SUBORDINATE;
 471                                 }
 472
 473                         } else {
 474                                 /*
 475                                  * this target is no longer candidate
 476                                  */
 477                                 retcode = META_SEARCH_NOT_CANDIDATE;
 478                                 goto doreturn;
 479                         }
 480                         break;
 481
 482                 case LDAP_SCOPE_SUBORDINATE:
 483                 case LDAP_SCOPE_ONELEVEL:
 484                 {
 485                         struct berval   rdn = mt->mt_nsuffix;
 486                         rdn.bv_len -= op->o_req_ndn.bv_len + STRLENOF( "," );
 487                         if ( dnIsOneLevelRDN( &rdn )
 488                                         && dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) )
 489                         {
 490                                 /*
 491                                  * if there is exactly one level,
 492                                  * make the target suffix the new
 493                                  * base, and make scope "base"
 494                                  */
 495                                 realbase = mt->mt_nsuffix;
 496                                 if ( op->ors_scope == LDAP_SCOPE_SUBORDINATE ) {
 497                                         if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 498                                                 realscope = LDAP_SCOPE_SUBORDINATE;
 499                                         } else {
 500                                                 realscope = LDAP_SCOPE_SUBTREE;
 501                                         }
 502                                 } else {
 503                                         realscope = LDAP_SCOPE_BASE;
 504                                 }
 505                                 break;
 506                         } /* else continue with the next case */
 507                 }
 508
 509                 case LDAP_SCOPE_BASE:
 510                         /*
 511                          * this target is no longer candidate
 512                          */
 513                         retcode = META_SEARCH_NOT_CANDIDATE;
 514                         goto doreturn;
 515                 }
 516         }
 517
 518         /* initiate dobind */
 519         retcode = meta_search_dobind_init( op, rs, mcp, candidate, candidates );
 520
 521         Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%d]=%d\n", op->o_log_prefix, candidate, retcode );
 522
 523         if ( retcode != META_SEARCH_CANDIDATE ) {
 524                 goto doreturn;
 525         }
 526
 527         /*
 528          * Rewrite the search base, if required
 529          */
 530         dc->target = mt;
 531         dc->ctx = "searchBase";
 532         switch ( ldap_back_dn_massage( dc, &realbase, &mbase ) ) {
 533         case LDAP_SUCCESS:
 534                 break;
 535
 536         case LDAP_UNWILLING_TO_PERFORM:
 537                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 538                 rs->sr_text = "Operation not allowed";
 539                 send_ldap_result( op, rs );
 540                 retcode = META_SEARCH_ERR;
 541                 goto doreturn;
 542
 543         default:
 544
 545                 /*
 546                  * this target is no longer candidate
 547                  */
 548                 retcode = META_SEARCH_NOT_CANDIDATE;
 549                 goto doreturn;
 550         }
 551
 552         /*
 553          * Maps filter
 554          */
 555         rc = ldap_back_filter_map_rewrite( dc, op->ors_filter,
 556                         &mfilter, BACKLDAP_MAP );
 557         switch ( rc ) {
 558         case LDAP_SUCCESS:
 559                 break;
 560
 561         case LDAP_COMPARE_FALSE:
 562         default:
 563                 /*
 564                  * this target is no longer candidate
 565                  */
 566                 retcode = META_SEARCH_NOT_CANDIDATE;
 567                 goto done;
 568         }
 569
 570         /*
 571          * Maps required attributes
 572          */
 573         rc = ldap_back_map_attrs( &mt->mt_rwmap.rwm_at,
 574                         op->ors_attrs, BACKLDAP_MAP, &mapped_attrs );
 575         if ( rc != LDAP_SUCCESS ) {
 576                 /*
 577                  * this target is no longer candidate
 578                  */
 579                 retcode = META_SEARCH_NOT_CANDIDATE;
 580                 goto done;
 581         }
 582
 583         /* should we check return values? */
 584         if ( op->ors_deref != -1 ) {
 585                 assert( msc->msc_ld != NULL );
 586                 (void)ldap_set_option( msc->msc_ld, LDAP_OPT_DEREF,
 587                                 ( void * )&op->ors_deref );
 588         }
 589
 590         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 591                 tv.tv_sec = op->ors_tlimit > 0 ? op->ors_tlimit : 1;
 592                 tv.tv_usec = 0;
 593                 tvp = &tv;
 594         }
 595
 596 retry:;
 597         ctrls = op->o_ctrls;
 598         if ( ldap_back_proxy_authz_ctrl( &msc->msc_bound_ndn,
 599                 mt->mt_version, &mt->mt_idassert, op, rs, &ctrls )
 600                 != LDAP_SUCCESS )
 601         {
 602                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 603                 retcode = META_SEARCH_NOT_CANDIDATE;
 604                 goto done;
 605         }
 606
 607         /*
 608          * Starts the search
 609          */
 610         assert( msc->msc_ld != NULL );
 611         rc = ldap_search_ext( msc->msc_ld,
 612                         mbase.bv_val, realscope, mfilter.bv_val,
 613                         mapped_attrs, op->ors_attrsonly,
 614                         ctrls, NULL, tvp, op->ors_slimit,
 615                         &candidates[ candidate ].sr_msgid );
 616         switch ( rc ) {
 617         case LDAP_SUCCESS:
 618                 retcode = META_SEARCH_CANDIDATE;
 619                 break;
 620
 621         case LDAP_SERVER_DOWN:
 622                 if ( nretries && meta_back_retry( op, rs, mcp, candidate, LDAP_BACK_DONTSEND ) ) {
 623                         nretries = 0;
 624                         /* if the identity changed, there might be need to re-authz */
 625                         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 626                         goto retry;
 627                 }
 628
 629                 if ( *mcp == NULL ) {
 630                         retcode = META_SEARCH_ERR;
 631                         break;
 632                 }
 633                 /* fall thru */
 634
 635         default:
 636                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 637                 retcode = META_SEARCH_NOT_CANDIDATE;
 638         }
 639
 640 done:;
 641         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 642
 643         if ( mapped_attrs ) {
 644                 free( mapped_attrs );
 645         }
 646         if ( mfilter.bv_val != op->ors_filterstr.bv_val ) {
 647                 free( mfilter.bv_val );
 648         }
 649         if ( mbase.bv_val != realbase.bv_val ) {
 650                 free( mbase.bv_val );
 651         }
 652
 653 doreturn:;
 654         Debug( LDAP_DEBUG_TRACE, "%s <<< meta_back_search_start[%d]=%d\n", op->o_log_prefix, candidate, retcode );
 655
 656         return retcode;
 657 }
 658
 659 int
 660 meta_back_search( Operation *op, SlapReply *rs )
 661 {
 662         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 663         metaconn_t      *mc;
 664         struct timeval  save_tv = { 0, 0 },
 665                         tv;
 666         time_t          stoptime = (time_t)-1;
 667         int             rc = 0, sres = LDAP_SUCCESS;
 668         char            *matched = NULL;
 669         int             last = 0, ncandidates = 0,
 670                         initial_candidates = 0, candidate_match = 0,
 671                         needbind = 0;
 672         ldap_back_send_t        sendok = LDAP_BACK_SENDERR;
 673         long            i;
 674         dncookie        dc;
 675         int             is_ok = 0;
 676         void            *savepriv;
 677         SlapReply       *candidates = meta_back_candidates_get( op );
 678
 679         /*
 680          * controls are set in ldap_back_dobind()
 681          *
 682          * FIXME: in case of values return filter, we might want
 683          * to map attrs and maybe rewrite value
 684          */
 685 getconn:;
 686         mc = meta_back_getconn( op, rs, NULL, sendok );
 687         if ( !mc ) {
 688                 return rs->sr_err;
 689         }
 690
 691         dc.conn = op->o_conn;
 692         dc.rs = rs;
 693
 694         /*
 695          * Inits searches
 696          */
 697         for ( i = 0; i < mi->mi_ntargets; i++ ) {
 698                 /* reset sr_msgid; it is used in most loops
 699                  * to check if that target is still to be considered */
 700                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 701
 702                 /* a target is marked as candidate by meta_back_getconn();
 703                  * if for any reason (an error, it's over or so) it is
 704                  * no longer active, sr_msgid is set to META_MSGID_IGNORE
 705                  * but it remains candidate, which means it has been active
 706                  * at some point during the operation.  This allows to
 707                  * use its response code and more to compute the final
 708                  * response */
 709                 if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
 710                         continue;
 711                 }
 712
 713                 candidates[ i ].sr_matched = NULL;
 714                 candidates[ i ].sr_text = NULL;
 715                 candidates[ i ].sr_ref = NULL;
 716                 candidates[ i ].sr_ctrls = NULL;
 717         }
 718
 719         for ( i = 0; i < mi->mi_ntargets; i++ ) {
 720                 if ( !META_IS_CANDIDATE( &candidates[ i ] )
 721                         || candidates[ i ].sr_err != LDAP_SUCCESS )
 722                 {
 723                         continue;
 724                 }
 725
 726                 switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
 727                 {
 728                 case META_SEARCH_NOT_CANDIDATE:
 729                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 730                         break;
 731
 732                 case META_SEARCH_NEED_BIND:
 733                         ++needbind;
 734                         /* fallthru */
 735
 736                 case META_SEARCH_CANDIDATE:
 737                 case META_SEARCH_BINDING:
 738                         candidates[ i ].sr_type = REP_INTERMEDIATE;
 739                         ++ncandidates;
 740                         break;
 741
 742                 case META_SEARCH_ERR:
 743                         savepriv = op->o_private;
 744                         op->o_private = (void *)i;
 745                         send_ldap_result( op, rs );
 746                         op->o_private = savepriv;
 747                         rc = -1;
 748                         goto finish;
 749
 750                 default:
 751                         assert( 0 );
 752                         break;
 753                 }
 754         }
 755
 756         if ( ncandidates > 0 && needbind == ncandidates ) {
 757                 /*
 758                  * give up the second time...
 759                  *
 760                  * NOTE: this should not occur the second time, since a fresh
 761                  * connection has ben created; however, targets may also
 762                  * need bind because the bind timed out or so.
 763                  */
 764                 if ( sendok & LDAP_BACK_BINDING ) {
 765                         Debug( LDAP_DEBUG_ANY,
 766                                 "%s meta_back_search: unable to initialize conn\n",
 767                                 op->o_log_prefix, 0, 0 );
 768                         rs->sr_err = LDAP_UNAVAILABLE;
 769                         rs->sr_text = "unable to initialize connection to remote targets";
 770                         send_ldap_result( op, rs );
 771                         rc = -1;
 772                         goto finish;
 773                 }
 774
 775                 /* FIXME: better create a separate connection? */
 776                 sendok |= LDAP_BACK_BINDING;
 777
 778 #ifdef DEBUG_205
 779                 Debug( LDAP_DEBUG_ANY, "*** %s drop mc=%p create new connection\n",
 780                         op->o_log_prefix, (void *)mc, 0 );
 781 #endif /* DEBUG_205 */
 782
 783                 meta_back_release_conn( op, mc );
 784                 mc = NULL;
 785
 786                 needbind = 0;
 787                 ncandidates = 0;
 788
 789                 goto getconn;
 790         }
 791
 792         initial_candidates = ncandidates;
 793
 794         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 795                 char    cnd[ SLAP_TEXT_BUFLEN ];
 796                 int     c;
 797
 798                 for ( c = 0; c < mi->mi_ntargets; c++ ) {
 799                         if ( META_IS_CANDIDATE( &candidates[ c ] ) ) {
 800                                 cnd[ c ] = '*';
 801                         } else {
 802                                 cnd[ c ] = ' ';
 803                         }
 804                 }
 805                 cnd[ c ] = '\0';
 806
 807                 Debug( LDAP_DEBUG_TRACE, "%s meta_back_search: ncandidates=%d "
 808                         "cnd=\"%s\"\n", op->o_log_prefix, ncandidates, cnd );
 809         }
 810
 811         if ( initial_candidates == 0 ) {
 812                 /* NOTE: here we are not sending any matchedDN;
 813                  * this is intended, because if the back-meta
 814                  * is serving this search request, but no valid
 815                  * candidate could be looked up, it means that
 816                  * there is a hole in the mapping of the targets
 817                  * and thus no knowledge of any remote superior
 818                  * is available */
 819                 Debug( LDAP_DEBUG_ANY, "%s meta_back_search: "
 820                         "base=\"%s\" scope=%d: "
 821                         "no candidate could be selected\n",
 822                         op->o_log_prefix, op->o_req_dn.bv_val,
 823                         op->ors_scope );
 824
 825                 /* FIXME: we're sending the first error we encounter;
 826                  * maybe we should pick the worst... */
 827                 rc = LDAP_NO_SUCH_OBJECT;
 828                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
 829                         if ( META_IS_CANDIDATE( &candidates[ i ] )
 830                                 && candidates[ i ].sr_err != LDAP_SUCCESS )
 831                         {
 832                                 rc = candidates[ i ].sr_err;
 833                                 break;
 834                         }
 835                 }
 836
 837                 send_ldap_error( op, rs, rc, NULL );
 838
 839                 goto finish;
 840         }
 841
 842         /* We pull apart the ber result, stuff it into a slapd entry, and
 843          * let send_search_entry stuff it back into ber format. Slow & ugly,
 844          * but this is necessary for version matching, and for ACL processing.
 845          */
 846
 847         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 848                 stoptime = op->o_time + op->ors_tlimit;
 849         }
 850
 851         /*
 852          * In case there are no candidates, no cycle takes place...
 853          *
 854          * FIXME: we might use a queue, to better balance the load
 855          * among the candidates
 856          */
 857         for ( rc = 0; ncandidates > 0; ) {
 858                 int     gotit = 0,
 859                         doabandon = 0,
 860                         alreadybound = ncandidates;
 861
 862                 /* check time limit */
 863                 if ( op->ors_tlimit != SLAP_NO_LIMIT
 864                                 && slap_get_time() > stoptime )
 865                 {
 866                         doabandon = 1;
 867                         rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 868                         savepriv = op->o_private;
 869                         op->o_private = (void *)i;
 870                         send_ldap_result( op, rs );
 871                         op->o_private = savepriv;
 872                         goto finish;
 873                 }
 874
 875                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
 876                         meta_search_candidate_t retcode = META_SEARCH_UNDEFINED;
 877                         metasingleconn_t        *msc = &mc->mc_conns[ i ];
 878                         LDAPMessage             *res = NULL, *msg;
 879
 880                         /* if msgid is invalid, don't ldap_result() */
 881                         if ( candidates[ i ].sr_msgid == META_MSGID_IGNORE ) {
 882                                 continue;
 883                         }
 884
 885                         /* if target still needs bind, retry */
 886                         if ( candidates[ i ].sr_msgid == META_MSGID_NEED_BIND ) {
 887                                 /* initiate dobind */
 888                                 retcode = meta_search_dobind_init( op, rs, &mc, i, candidates );
 889
 890                                 Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%ld]=%d\n",
 891                                         op->o_log_prefix, i, retcode );
 892
 893                                 switch ( retcode ) {
 894                                 case META_SEARCH_NEED_BIND:
 895                                         alreadybound--;
 896                                         /* fallthru */
 897
 898                                 case META_SEARCH_BINDING:
 899                                         break;
 900
 901                                 case META_SEARCH_ERR:
 902                                         candidates[ i ].sr_err = rs->sr_err;
 903                                         if ( META_BACK_ONERR_STOP( mi ) ) {
 904                                                 savepriv = op->o_private;
 905                                                 op->o_private = (void *)i;
 906                                                 send_ldap_result( op, rs );
 907                                                 op->o_private = savepriv;
 908                                                 goto finish;
 909                                         }
 910                                         /* fallthru */
 911
 912                                 case META_SEARCH_NOT_CANDIDATE:
 913                                         /*
 914                                          * When no candidates are left,
 915                                          * the outer cycle finishes
 916                                          */
 917                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 918                                         assert( ncandidates > 0 );
 919                                         --ncandidates;
 920                                         break;
 921
 922                                 case META_SEARCH_CANDIDATE:
 923                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 924                                         switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
 925                                         {
 926                                         case META_SEARCH_CANDIDATE:
 927                                                 assert( candidates[ i ].sr_msgid >= 0 );
 928                                                 break;
 929
 930                                         case META_SEARCH_ERR:
 931                                                 candidates[ i ].sr_err = rs->sr_err;
 932                                                 if ( META_BACK_ONERR_STOP( mi ) ) {
 933                                                         savepriv = op->o_private;
 934                                                         op->o_private = (void *)i;
 935                                                         send_ldap_result( op, rs );
 936                                                         op->o_private = savepriv;
 937                                                         goto finish;
 938                                                 }
 939                                                 /* fallthru */
 940
 941                                         case META_SEARCH_NOT_CANDIDATE:
 942                                                 /* means that meta_back_search_start()
 943                                                  * failed but onerr == continue */
 944                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 945                                                 assert( ncandidates > 0 );
 946                                                 --ncandidates;
 947                                                 break;
 948
 949                                         default:
 950                                                 /* impossible */
 951                                                 assert( 0 );
 952                                                 break;
 953                                         }
 954                                         break;
 955
 956                                 default:
 957                                         /* impossible */
 958                                         assert( 0 );
 959                                         break;
 960                                 }
 961                                 continue;
 962                         }
 963
 964                         /* check for abandon */
 965                         if ( op->o_abandon || LDAP_BACK_CONN_ABANDON( mc ) ) {
 966                                 break;
 967                         }
 968
 969 #ifdef DEBUG_205
 970                         if ( msc->msc_ld == NULL ) {
 971                                 char    buf[ SLAP_TEXT_BUFLEN ];
 972
 973                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 974                                 snprintf( buf, sizeof( buf ),
 975                                         "%s meta_back_search[%ld] mc=%p msgid=%d%s%s%s\n",
 976                                         op->o_log_prefix, (long)i, (void *)mc,
 977                                         candidates[ i ].sr_msgid,
 978                                         META_IS_BINDING( &candidates[ i ] ) ? " binding" : "",
 979                                         LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ? " connbinding" : "",
 980                                         META_BACK_CONN_CREATING( &mc->mc_conns[ i ] ) ? " conncreating" : "" );
 981                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 982
 983                                 Debug( LDAP_DEBUG_ANY, "!!! %s\n", buf, 0, 0 );
 984                         }
 985 #endif /* DEBUG_205 */
 986
 987                         /*
 988                          * FIXME: handle time limit as well?
 989                          * Note that target servers are likely
 990                          * to handle it, so at some time we'll
 991                          * get a LDAP_TIMELIMIT_EXCEEDED from
 992                          * one of them ...
 993                          */
 994                         tv = save_tv;
 995                         rc = ldap_result( msc->msc_ld, candidates[ i ].sr_msgid,
 996                                         LDAP_MSG_RECEIVED, &tv, &res );
 997                         switch ( rc ) {
 998                         case 0:
 999                                 /* FIXME: res should not need to be freed */
1000                                 assert( res == NULL );
1001                                 continue;
1002
1003                         case -1:
1004 really_bad:;
1005                                 /* something REALLY bad happened! */
1006                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
1007                                         candidates[ i ].sr_type = REP_RESULT;
1008
1009                                         if ( meta_back_retry( op, rs, &mc, i, LDAP_BACK_DONTSEND ) ) {
1010                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1011                                                 switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
1012                                                 {
1013                                                         /* means that failed but onerr == continue */
1014                                                 case META_SEARCH_NOT_CANDIDATE:
1015                                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1016
1017                                                         assert( ncandidates > 0 );
1018                                                         --ncandidates;
1019
1020                                                         candidates[ i ].sr_err = rs->sr_err;
1021                                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1022                                                                 savepriv = op->o_private;
1023                                                                 op->o_private = (void *)i;
1024                                                                 send_ldap_result( op, rs );
1025                                                                 op->o_private = savepriv;
1026                                                                 goto finish;
1027                                                         }
1028                                                         /* fall thru */
1029
1030                                                 case META_SEARCH_CANDIDATE:
1031                                                         /* get back into business... */
1032                                                         continue;
1033
1034                                                 case META_SEARCH_BINDING:
1035                                                 case META_SEARCH_NEED_BIND:
1036                                                 case META_SEARCH_UNDEFINED:
1037                                                         assert( 0 );
1038
1039                                                 default:
1040                                                         /* unrecoverable error */
1041                                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1042                                                         rc = rs->sr_err = LDAP_OTHER;
1043                                                         goto finish;
1044                                                 }
1045                                         }
1046
1047                                         candidates[ i ].sr_err = rs->sr_err;
1048                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1049                                                 savepriv = op->o_private;
1050                                                 op->o_private = (void *)i;
1051                                                 send_ldap_result( op, rs );
1052                                                 op->o_private = savepriv;
1053                                                 goto finish;
1054                                         }
1055                                 }
1056
1057                                 /*
1058                                  * When no candidates are left,
1059                                  * the outer cycle finishes
1060                                  */
1061                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1062                                 assert( ncandidates > 0 );
1063                                 --ncandidates;
1064                                 rs->sr_err = candidates[ i ].sr_err;
1065                                 continue;
1066
1067                         default:
1068                                 /* only touch when activity actually took place... */
1069                                 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
1070                                         msc->msc_time = op->o_time;
1071                                 }
1072                                 break;
1073                         }
1074
1075                         for ( msg = ldap_first_message( msc->msc_ld, res );
1076                                 msg != NULL;
1077                                 msg = ldap_next_message( msc->msc_ld, msg ) )
1078                         {
1079                                 rc = ldap_msgtype( msg );
1080                                 if ( rc == LDAP_RES_SEARCH_ENTRY ) {
1081                                         LDAPMessage     *e;
1082
1083                                         if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
1084                                                 /* don't retry any more... */
1085                                                 candidates[ i ].sr_type = REP_RESULT;
1086                                         }
1087
1088                                         is_ok++;
1089
1090                                         e = ldap_first_entry( msc->msc_ld, msg );
1091                                         savepriv = op->o_private;
1092                                         op->o_private = (void *)i;
1093                                         rs->sr_err = meta_send_entry( op, rs, mc, i, e );
1094
1095                                         switch ( rs->sr_err ) {
1096                                         case LDAP_SIZELIMIT_EXCEEDED:
1097                                                 savepriv = op->o_private;
1098                                                 op->o_private = (void *)i;
1099                                                 send_ldap_result( op, rs );
1100                                                 op->o_private = savepriv;
1101                                                 rs->sr_err = LDAP_SUCCESS;
1102                                                 ldap_msgfree( res );
1103                                                 res = NULL;
1104                                                 goto finish;
1105
1106                                         case LDAP_UNAVAILABLE:
1107                                                 rs->sr_err = LDAP_OTHER;
1108                                                 ldap_msgfree( res );
1109                                                 res = NULL;
1110                                                 goto finish;
1111                                         }
1112                                         op->o_private = savepriv;
1113
1114                                         /* don't wait any longer... */
1115                                         gotit = 1;
1116                                         save_tv.tv_sec = 0;
1117                                         save_tv.tv_usec = 0;
1118
1119                                 } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
1120                                         char            **references = NULL;
1121                                         int             cnt;
1122
1123                                         if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
1124                                                 /* don't retry any more... */
1125                                                 candidates[ i ].sr_type = REP_RESULT;
1126                                         }
1127
1128                                         is_ok++;
1129
1130                                         rc = ldap_parse_reference( msc->msc_ld, msg,
1131                                                         &references, &rs->sr_ctrls, 0 );
1132
1133                                         if ( rc != LDAP_SUCCESS ) {
1134                                                 continue;
1135                                         }
1136
1137                                         if ( references == NULL ) {
1138                                                 continue;
1139                                         }
1140
1141 #ifdef ENABLE_REWRITE
1142                                         dc.ctx = "referralDN";
1143 #else /* ! ENABLE_REWRITE */
1144                                         dc.tofrom = 0;
1145                                         dc.normalized = 0;
1146 #endif /* ! ENABLE_REWRITE */
1147
1148                                         /* FIXME: merge all and return at the end */
1149
1150                                         for ( cnt = 0; references[ cnt ]; cnt++ )
1151                                                 ;
1152
1153                                         rs->sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
1154
1155                                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
1156                                                 ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
1157                                         }
1158                                         BER_BVZERO( &rs->sr_ref[ cnt ] );
1159
1160                                         ( void )ldap_back_referral_result_rewrite( &dc, rs->sr_ref );
1161
1162                                         if ( rs->sr_ref != NULL && !BER_BVISNULL( &rs->sr_ref[ 0 ] ) ) {
1163                                                 /* ignore return value by now */
1164                                                 savepriv = op->o_private;
1165                                                 op->o_private = (void *)i;
1166                                                 ( void )send_search_reference( op, rs );
1167                                                 op->o_private = savepriv;
1168
1169                                                 ber_bvarray_free( rs->sr_ref );
1170                                                 rs->sr_ref = NULL;
1171                                         }
1172
1173                                         /* cleanup */
1174                                         if ( references ) {
1175                                                 ber_memvfree( (void **)references );
1176                                         }
1177
1178                                         if ( rs->sr_ctrls ) {
1179                                                 ldap_controls_free( rs->sr_ctrls );
1180                                                 rs->sr_ctrls = NULL;
1181                                         }
1182
1183                                 } else if ( rc == LDAP_RES_SEARCH_RESULT ) {
1184                                         char            buf[ SLAP_TEXT_BUFLEN ];
1185                                         char            **references = NULL;
1186
1187                                         if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
1188                                                 /* don't retry any more... */
1189                                                 candidates[ i ].sr_type = REP_RESULT;
1190                                         }
1191
1192                                         /* NOTE: ignores response controls
1193                                          * (and intermediate response controls
1194                                          * as well, except for those with search
1195                                          * references); this may not be correct,
1196                                          * but if they're not ignored then
1197                                          * back-meta would need to merge them
1198                                          * consistently (think of pagedResults...)
1199                                          */
1200                                         /* FIXME: response controls? */
1201                                         rs->sr_err = ldap_parse_result( msc->msc_ld,
1202                                                 msg,
1203                                                 &candidates[ i ].sr_err,
1204                                                 (char **)&candidates[ i ].sr_matched,
1205                                                 NULL /* (char **)&candidates[ i ].sr_text */ ,
1206                                                 &references,
1207                                                 NULL /* &candidates[ i ].sr_ctrls (unused) */ ,
1208                                                 0 );
1209                                         if ( rs->sr_err != LDAP_SUCCESS ) {
1210                                                 ldap_get_option( msc->msc_ld,
1211                                                         LDAP_OPT_ERROR_NUMBER,
1212                                                         &rs->sr_err );
1213                                                 sres = slap_map_api2result( rs );
1214                                                 candidates[ i ].sr_type = REP_RESULT;
1215                                                 ldap_msgfree( res );
1216                                                 res = NULL;
1217                                                 goto really_bad;
1218                                         }
1219
1220                                         /* massage matchedDN if need be */
1221                                         if ( candidates[ i ].sr_matched != NULL ) {
1222                                                 struct berval   match, mmatch;
1223
1224                                                 ber_str2bv( candidates[ i ].sr_matched,
1225                                                         0, 0, &match );
1226                                                 candidates[ i ].sr_matched = NULL;
1227
1228                                                 dc.ctx = "matchedDN";
1229                                                 dc.target = mi->mi_targets[ i ];
1230                                                 if ( !ldap_back_dn_massage( &dc, &match, &mmatch ) ) {
1231                                                         if ( mmatch.bv_val == match.bv_val ) {
1232                                                                 candidates[ i ].sr_matched
1233                                                                         = ch_strdup( mmatch.bv_val );
1234
1235                                                         } else {
1236                                                                 candidates[ i ].sr_matched = mmatch.bv_val;
1237                                                         }
1238
1239                                                         candidate_match++;
1240                                                 }
1241                                                 ldap_memfree( match.bv_val );
1242                                         }
1243
1244                                         /* add references to array */
1245                                         if ( references ) {
1246                                                 BerVarray       sr_ref;
1247                                                 int             cnt;
1248
1249                                                 for ( cnt = 0; references[ cnt ]; cnt++ )
1250                                                         ;
1251
1252                                                 sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
1253
1254                                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
1255                                                         ber_str2bv( references[ cnt ], 0, 1, &sr_ref[ cnt ] );
1256                                                 }
1257                                                 BER_BVZERO( &sr_ref[ cnt ] );
1258
1259                                                 ( void )ldap_back_referral_result_rewrite( &dc, sr_ref );
1260
1261                                                 /* cleanup */
1262                                                 ber_memvfree( (void **)references );
1263
1264                                                 if ( rs->sr_v2ref == NULL ) {
1265                                                         rs->sr_v2ref = sr_ref;
1266
1267                                                 } else {
1268                                                         for ( cnt = 0; !BER_BVISNULL( &sr_ref[ cnt ] ); cnt++ ) {
1269                                                                 ber_bvarray_add( &rs->sr_v2ref, &sr_ref[ cnt ] );
1270                                                         }
1271                                                         ber_memfree( sr_ref );
1272                                                 }
1273                                         }
1274
1275                                         rs->sr_err = candidates[ i ].sr_err;
1276                                         sres = slap_map_api2result( rs );
1277
1278                                         if ( LogTest( LDAP_DEBUG_TRACE | LDAP_DEBUG_ANY ) ) {
1279                                                 snprintf( buf, sizeof( buf ),
1280                                                         "%s meta_back_search[%ld] "
1281                                                         "match=\"%s\" err=%ld",
1282                                                         op->o_log_prefix, i,
1283                                                         candidates[ i ].sr_matched ? candidates[ i ].sr_matched : "",
1284                                                         (long) candidates[ i ].sr_err );
1285                                                 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1286                                                         Debug( LDAP_DEBUG_TRACE, "%s.\n", buf, 0, 0 );
1287
1288                                                 } else {
1289                                                         Debug( LDAP_DEBUG_ANY, "%s (%s).\n",
1290                                                                 buf, ldap_err2string( candidates[ i ].sr_err ), 0 );
1291                                                 }
1292                                         }
1293
1294                                         switch ( sres ) {
1295                                         case LDAP_NO_SUCH_OBJECT:
1296                                                 /* is_ok is touched any time a valid
1297                                                  * (even intermediate) result is
1298                                                  * returned; as a consequence, if
1299                                                  * a candidate returns noSuchObject
1300                                                  * it is ignored and the candidate
1301                                                  * is simply demoted. */
1302                                                 if ( is_ok ) {
1303                                                         sres = LDAP_SUCCESS;
1304                                                 }
1305                                                 break;
1306
1307                                         case LDAP_SUCCESS:
1308                                         case LDAP_REFERRAL:
1309                                                 is_ok++;
1310                                                 break;
1311
1312                                         case LDAP_SIZELIMIT_EXCEEDED:
1313                                                 /* if a target returned sizelimitExceeded
1314                                                  * and the entry count is equal to the
1315                                                  * proxy's limit, the target would have
1316                                                  * returned more, and the error must be
1317                                                  * propagated to the client; otherwise,
1318                                                  * the target enforced a limit lower
1319                                                  * than what requested by the proxy;
1320                                                  * ignore it */
1321                                                 candidates[ i ].sr_err = rs->sr_err;
1322                                                 if ( rs->sr_nentries == op->ors_slimit
1323                                                         || META_BACK_ONERR_STOP( mi ) )
1324                                                 {
1325                                                         savepriv = op->o_private;
1326                                                         op->o_private = (void *)i;
1327                                                         send_ldap_result( op, rs );
1328                                                         op->o_private = savepriv;
1329                                                         ldap_msgfree( res );
1330                                                         res = NULL;
1331                                                         goto finish;
1332                                                 }
1333                                                 break;
1334
1335                                         default:
1336                                                 candidates[ i ].sr_err = rs->sr_err;
1337                                                 if ( META_BACK_ONERR_STOP( mi ) ) {
1338                                                         savepriv = op->o_private;
1339                                                         op->o_private = (void *)i;
1340                                                         send_ldap_result( op, rs );
1341                                                         op->o_private = savepriv;
1342                                                         ldap_msgfree( res );
1343                                                         res = NULL;
1344                                                         goto finish;
1345                                                 }
1346                                                 break;
1347                                         }
1348
1349                                         last = i;
1350                                         rc = 0;
1351
1352                                         /*
1353                                          * When no candidates are left,
1354                                          * the outer cycle finishes
1355                                          */
1356                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1357                                         assert( ncandidates > 0 );
1358                                         --ncandidates;
1359
1360                                 } else if ( rc == LDAP_RES_BIND ) {
1361                                         meta_search_candidate_t retcode;
1362
1363                                         retcode = meta_search_dobind_result( op, rs, &mc, i, candidates, msg );
1364                                         if ( retcode == META_SEARCH_CANDIDATE ) {
1365                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1366                                                 retcode = meta_back_search_start( op, rs, &dc, &mc, i, candidates );
1367                                         }
1368
1369                                         switch ( retcode ) {
1370                                         case META_SEARCH_CANDIDATE:
1371                                                 break;
1372
1373                                                 /* means that failed but onerr == continue */
1374                                         case META_SEARCH_NOT_CANDIDATE:
1375                                         case META_SEARCH_ERR:
1376                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1377                                                 assert( ncandidates > 0 );
1378                                                 --ncandidates;
1379
1380                                                 candidates[ i ].sr_err = rs->sr_err;
1381                                                 if ( META_BACK_ONERR_STOP( mi ) ) {
1382                                                         savepriv = op->o_private;
1383                                                         op->o_private = (void *)i;
1384                                                         send_ldap_result( op, rs );
1385                                                         op->o_private = savepriv;
1386                                                         ldap_msgfree( res );
1387                                                         res = NULL;
1388                                                         goto finish;
1389                                                 }
1390                                                 goto free_message;
1391
1392                                         default:
1393                                                 assert( 0 );
1394                                                 break;
1395                                         }
1396
1397                                 } else {
1398                                         assert( 0 );
1399                                         ldap_msgfree( res );
1400                                         res = NULL;
1401                                         goto really_bad;
1402                                 }
1403                         }
1404
1405 free_message:;
1406                         ldap_msgfree( res );
1407                         res = NULL;
1408                 }
1409
1410                 /* check for abandon */
1411                 if ( op->o_abandon || LDAP_BACK_CONN_ABANDON( mc ) ) {
1412                         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1413                                 if ( candidates[ i ].sr_msgid >= 0 ) {
1414                                         if ( META_IS_BINDING( &candidates[ i ] ) ) {
1415                                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1416                                                 if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ) {
1417                                                         /* if still binding, destroy */
1418
1419 #ifdef DEBUG_205
1420                                                         char buf[ SLAP_TEXT_BUFLEN ];
1421
1422                                                         snprintf( buf, sizeof( buf), "%s meta_back_search(abandon) "
1423                                                                 "ldap_unbind_ext[%ld] mc=%p ld=%p",
1424                                                                 op->o_log_prefix, i, (void *)mc,
1425                                                                 (void *)mc->mc_conns[i].msc_ld );
1426
1427                                                         Debug( LDAP_DEBUG_ANY, "### %s\n", buf, 0, 0 );
1428 #endif /* DEBUG_205 */
1429
1430                                                         meta_clear_one_candidate( op, mc, i );
1431                                                 }
1432                                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1433                                                 META_BINDING_CLEAR( &candidates[ i ] );
1434
1435                                         } else {
1436                                                 (void)meta_back_cancel( mc, op, rs,
1437                                                         candidates[ i ].sr_msgid, i,
1438                                                         LDAP_BACK_DONTSEND );
1439                                         }
1440
1441                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1442                                         assert( ncandidates > 0 );
1443                                         --ncandidates;
1444                                 }
1445                         }
1446
1447                         if ( op->o_abandon ) {
1448                                 rc = SLAPD_ABANDON;
1449                         }
1450
1451                         /* let send_ldap_result play cleanup handlers (ITS#4645) */
1452                         break;
1453                 }
1454
1455                 /* if no entry was found during this loop,
1456                  * set a minimal timeout */
1457                 if ( ncandidates > 0 && gotit == 0 ) {
1458                         if ( save_tv.tv_sec == 0 && save_tv.tv_usec == 0 ) {
1459                                 save_tv.tv_usec = LDAP_BACK_RESULT_UTIMEOUT/initial_candidates;
1460
1461                                 /* arbitrarily limit to something between 1 and 2 minutes */
1462                         } else if ( ( stoptime == -1 && save_tv.tv_sec < 60 )
1463                                 || save_tv.tv_sec < ( stoptime - slap_get_time() ) / ( 2 * ncandidates ) )
1464                         {
1465                                 /* double the timeout */
1466                                 lutil_timermul( &save_tv, 2, &save_tv );
1467                         }
1468
1469                         if ( alreadybound == 0 ) {
1470                                 tv = save_tv;
1471                                 (void)select( 0, NULL, NULL, NULL, &tv );
1472
1473                         } else {
1474                                 ldap_pvt_thread_yield();
1475                         }
1476                 }
1477         }
1478
1479         if ( rc == -1 ) {
1480                 /*
1481                  * FIXME: need a better strategy to handle errors
1482                  */
1483                 if ( mc ) {
1484                         rc = meta_back_op_result( mc, op, rs, META_TARGET_NONE,
1485                                 -1, stoptime != -1 ? (stoptime - slap_get_time()) : 0,
1486                                 LDAP_BACK_SENDERR );
1487                 } else {
1488                         rc = rs->sr_err;
1489                 }
1490                 goto finish;
1491         }
1492
1493         /*
1494          * Rewrite the matched portion of the search base, if required
1495          *
1496          * FIXME: only the last one gets caught!
1497          */
1498         savepriv = op->o_private;
1499         op->o_private = (void *)(long)mi->mi_ntargets;
1500         if ( candidate_match > 0 ) {
1501                 struct berval   pmatched = BER_BVNULL;
1502
1503                 /* we use the first one */
1504                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1505                         if ( META_IS_CANDIDATE( &candidates[ i ] )
1506                                         && candidates[ i ].sr_matched != NULL )
1507                         {
1508                                 struct berval   bv, pbv;
1509                                 int             rc;
1510
1511                                 /* if we got success, and this target
1512                                  * returned noSuchObject, and its suffix
1513                                  * is a superior of the searchBase,
1514                                  * ignore the matchedDN */
1515                                 if ( sres == LDAP_SUCCESS
1516                                         && candidates[ i ].sr_err == LDAP_NO_SUCH_OBJECT
1517                                         && op->o_req_ndn.bv_len > mi->mi_targets[ i ]->mt_nsuffix.bv_len )
1518                                 {
1519                                         free( (char *)candidates[ i ].sr_matched );
1520                                         candidates[ i ].sr_matched = NULL;
1521                                         continue;
1522                                 }
1523
1524                                 ber_str2bv( candidates[ i ].sr_matched, 0, 0, &bv );
1525                                 rc = dnPretty( NULL, &bv, &pbv, op->o_tmpmemctx );
1526
1527                                 if ( rc == LDAP_SUCCESS ) {
1528
1529                                         /* NOTE: if they all are superiors
1530                                          * of the baseDN, the shorter is also
1531                                          * superior of the longer... */
1532                                         if ( pbv.bv_len > pmatched.bv_len ) {
1533                                                 if ( !BER_BVISNULL( &pmatched ) ) {
1534                                                         op->o_tmpfree( pmatched.bv_val, op->o_tmpmemctx );
1535                                                 }
1536                                                 pmatched = pbv;
1537                                                 op->o_private = (void *)i;
1538
1539                                         } else {
1540                                                 op->o_tmpfree( pbv.bv_val, op->o_tmpmemctx );
1541                                         }
1542                                 }
1543
1544                                 if ( candidates[ i ].sr_matched != NULL ) {
1545                                         free( (char *)candidates[ i ].sr_matched );
1546                                         candidates[ i ].sr_matched = NULL;
1547                                 }
1548                         }
1549                 }
1550
1551                 if ( !BER_BVISNULL( &pmatched ) ) {
1552                         matched = pmatched.bv_val;
1553                 }
1554
1555         } else if ( sres == LDAP_NO_SUCH_OBJECT ) {
1556                 matched = op->o_bd->be_suffix[ 0 ].bv_val;
1557         }
1558
1559         /*
1560          * In case we returned at least one entry, we return LDAP_SUCCESS
1561          * otherwise, the latter error code we got
1562          */
1563
1564         if ( sres == LDAP_SUCCESS ) {
1565                 if ( rs->sr_v2ref ) {
1566                         sres = LDAP_REFERRAL;
1567                 }
1568
1569                 if ( META_BACK_ONERR_REPORT( mi ) ) {
1570                         /*
1571                          * Report errors, if any
1572                          *
1573                          * FIXME: we should handle error codes and return the more
1574                          * important/reasonable
1575                          */
1576                         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1577                                 if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
1578                                         continue;
1579                                 }
1580
1581                                 if ( candidates[ i ].sr_err != LDAP_SUCCESS
1582                                         && candidates[ i ].sr_err != LDAP_NO_SUCH_OBJECT )
1583                                 {
1584                                         sres = candidates[ i ].sr_err;
1585                                         break;
1586                                 }
1587                         }
1588                 }
1589         }
1590
1591         rs->sr_err = sres;
1592         rs->sr_matched = matched;
1593         rs->sr_ref = ( sres == LDAP_REFERRAL ? rs->sr_v2ref : NULL );
1594         send_ldap_result( op, rs );
1595         op->o_private = savepriv;
1596         rs->sr_matched = NULL;
1597         rs->sr_ref = NULL;
1598
1599 finish:;
1600         if ( matched && matched != op->o_bd->be_suffix[ 0 ].bv_val ) {
1601                 op->o_tmpfree( matched, op->o_tmpmemctx );
1602         }
1603
1604         if ( rs->sr_v2ref ) {
1605                 ber_bvarray_free( rs->sr_v2ref );
1606         }
1607
1608         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1609                 if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
1610                         continue;
1611                 }
1612
1613                 if ( mc && META_IS_BINDING( &candidates[ i ] ) ) {
1614                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1615                         if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ) {
1616                                 assert( candidates[ i ].sr_msgid >= 0 );
1617                                 assert( mc->mc_conns[ i ].msc_ld != NULL );
1618
1619 #ifdef DEBUG_205
1620                                 Debug( LDAP_DEBUG_ANY, "### %s meta_back_search(cleanup) "
1621                                         "ldap_unbind_ext[%ld] ld=%p\n",
1622                                         op->o_log_prefix, i, (void *)mc->mc_conns[i].msc_ld );
1623 #endif /* DEBUG_205 */
1624
1625                                 /* if still binding, destroy */
1626                                 meta_clear_one_candidate( op, mc, i );
1627                         }
1628                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1629                         META_BINDING_CLEAR( &candidates[ i ] );
1630                 }
1631
1632                 if ( candidates[ i ].sr_matched ) {
1633                         free( (char *)candidates[ i ].sr_matched );
1634                         candidates[ i ].sr_matched = NULL;
1635                 }
1636
1637                 if ( candidates[ i ].sr_text ) {
1638                         ldap_memfree( (char *)candidates[ i ].sr_text );
1639                         candidates[ i ].sr_text = NULL;
1640                 }
1641
1642                 if ( candidates[ i ].sr_ref ) {
1643                         ber_bvarray_free( candidates[ i ].sr_ref );
1644                         candidates[ i ].sr_ref = NULL;
1645                 }
1646
1647                 if ( candidates[ i ].sr_ctrls ) {
1648                         ldap_controls_free( candidates[ i ].sr_ctrls );
1649                         candidates[ i ].sr_ctrls = NULL;
1650                 }
1651
1652                 if ( META_BACK_TGT_QUARANTINE( mi->mi_targets[ i ] ) ) {
1653                         meta_back_quarantine( op, &candidates[ i ], i );
1654                 }
1655
1656                 /* only in case of timelimit exceeded, if the timelimit exceeded because
1657                  * one contacted target never responded, invalidate the connection
1658                  * NOTE: should we quarantine the target as well?  right now, the connection
1659                  * is invalidated; the next time it will be recreated and the target
1660                  * will be quarantined if it cannot be contacted */
1661                 if ( mi->mi_idle_timeout != 0
1662                         && rs->sr_err == LDAP_TIMELIMIT_EXCEEDED
1663                         && op->o_time > mc->mc_conns[ i ].msc_time )
1664                 {
1665                         /* don't let anyone else use this expired connection */
1666                         LDAP_BACK_CONN_TAINTED_SET( mc );
1667                 }
1668         }
1669
1670         if ( mc ) {
1671                 meta_back_release_conn( op, mc );
1672         }
1673
1674         return rs->sr_err;
1675 }
1676
1677 static int
1678 meta_send_entry(
1679         Operation       *op,
1680         SlapReply       *rs,
1681         metaconn_t      *mc,
1682         int             target,
1683         LDAPMessage     *e )
1684 {
1685         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
1686         struct berval           a, mapped;
1687         Entry                   ent = { 0 };
1688         BerElement              ber = *e->lm_ber;
1689         Attribute               *attr, **attrp;
1690         struct berval           bdn,
1691                                 dn = BER_BVNULL;
1692         const char              *text;
1693         dncookie                dc;
1694         int                     rc;
1695
1696         if ( ber_scanf( &ber, "{m{", &bdn ) == LBER_ERROR ) {
1697                 return LDAP_DECODING_ERROR;
1698         }
1699
1700         /*
1701          * Rewrite the dn of the result, if needed
1702          */
1703         dc.target = mi->mi_targets[ target ];
1704         dc.conn = op->o_conn;
1705         dc.rs = rs;
1706         dc.ctx = "searchResult";
1707
1708         rs->sr_err = ldap_back_dn_massage( &dc, &bdn, &dn );
1709         if ( rs->sr_err != LDAP_SUCCESS) {
1710                 return rs->sr_err;
1711         }
1712
1713         /*
1714          * Note: this may fail if the target host(s) schema differs
1715          * from the one known to the meta, and a DN with unknown
1716          * attributes is returned.
1717          *
1718          * FIXME: should we log anything, or delegate to dnNormalize?
1719          */
1720         rc = dnPrettyNormal( NULL, &dn, &ent.e_name, &ent.e_nname,
1721                 op->o_tmpmemctx );
1722         if ( dn.bv_val != bdn.bv_val ) {
1723                 free( dn.bv_val );
1724         }
1725         BER_BVZERO( &dn );
1726
1727         if ( rc != LDAP_SUCCESS ) {
1728                 return LDAP_INVALID_DN_SYNTAX;
1729         }
1730
1731         /*
1732          * cache dn
1733          */
1734         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1735                 ( void )meta_dncache_update_entry( &mi->mi_cache,
1736                                 &ent.e_nname, target );
1737         }
1738
1739         attrp = &ent.e_attrs;
1740
1741         dc.ctx = "searchAttrDN";
1742         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
1743                 int                             last = 0;
1744                 slap_syntax_validate_func       *validate;
1745                 slap_syntax_transform_func      *pretty;
1746
1747                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_at,
1748                                 &a, &mapped, BACKLDAP_REMAP );
1749                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0' ) {
1750                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1751                         continue;
1752                 }
1753                 attr = attr_alloc( NULL );
1754                 if ( attr == NULL ) {
1755                         continue;
1756                 }
1757                 if ( slap_bv2ad( &mapped, &attr->a_desc, &text )
1758                                 != LDAP_SUCCESS) {
1759                         if ( slap_bv2undef_ad( &mapped, &attr->a_desc, &text,
1760                                 SLAP_AD_PROXIED ) != LDAP_SUCCESS )
1761                         {
1762                                 char    buf[ SLAP_TEXT_BUFLEN ];
1763
1764                                 snprintf( buf, sizeof( buf ),
1765                                         "%s meta_send_entry(\"%s\"): "
1766                                         "slap_bv2undef_ad(%s): %s\n",
1767                                         op->o_log_prefix, ent.e_name.bv_val,
1768                                         mapped.bv_val, text );
1769
1770                                 Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
1771                                 attr_free( attr );
1772                                 continue;
1773                         }
1774                 }
1775
1776                 /* no subschemaSubentry */
1777                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
1778                         || attr->a_desc == slap_schema.si_ad_entryDN )
1779                 {
1780
1781                         /*
1782                          * We eat target's subschemaSubentry because
1783                          * a search for this value is likely not
1784                          * to resolve to the appropriate backend;
1785                          * later, the local subschemaSubentry is
1786                          * added.
1787                          *
1788                          * We also eat entryDN because the frontend
1789                          * will reattach it without checking if already
1790                          * present...
1791                          */
1792                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1793
1794                         attr_free(attr);
1795                         continue;
1796                 }
1797
1798                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
1799                                 || attr->a_vals == NULL )
1800                 {
1801                         attr->a_vals = (struct berval *)&slap_dummy_bv;
1802
1803                 } else {
1804                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); ++last )
1805                                 ;
1806                 }
1807
1808                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
1809                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
1810
1811                 if ( !validate && !pretty ) {
1812                         attr_free( attr );
1813                         goto next_attr;
1814                 }
1815
1816                 if ( attr->a_desc == slap_schema.si_ad_objectClass
1817                                 || attr->a_desc == slap_schema.si_ad_structuralObjectClass )
1818                 {
1819                         struct berval   *bv;
1820
1821                         for ( bv = attr->a_vals; !BER_BVISNULL( bv ); bv++ ) {
1822                                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_oc,
1823                                                 bv, &mapped, BACKLDAP_REMAP );
1824                                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0') {
1825                                         free( bv->bv_val );
1826                                         BER_BVZERO( bv );
1827                                         if ( --last < 0 ) {
1828                                                 break;
1829                                         }
1830                                         *bv = attr->a_vals[ last ];
1831                                         BER_BVZERO( &attr->a_vals[ last ] );
1832                                         bv--;
1833
1834                                 } else if ( mapped.bv_val != bv->bv_val ) {
1835                                         free( bv->bv_val );
1836                                         ber_dupbv( bv, &mapped );
1837                                 }
1838                         }
1839                 /*
1840                  * It is necessary to try to rewrite attributes with
1841                  * dn syntax because they might be used in ACLs as
1842                  * members of groups; since ACLs are applied to the
1843                  * rewritten stuff, no dn-based subecj clause could
1844                  * be used at the ldap backend side (see
1845                  * http://www.OpenLDAP.org/faq/data/cache/452.html)
1846                  * The problem can be overcome by moving the dn-based
1847                  * ACLs to the target directory server, and letting
1848                  * everything pass thru the ldap backend.
1849                  */
1850                 } else {
1851                         int     i;
1852
1853                         if ( attr->a_desc->ad_type->sat_syntax ==
1854                                 slap_schema.si_syn_distinguishedName )
1855                         {
1856                                 ldap_dnattr_result_rewrite( &dc, attr->a_vals );
1857
1858                         } else if ( attr->a_desc == slap_schema.si_ad_ref ) {
1859                                 ldap_back_referral_result_rewrite( &dc, attr->a_vals );
1860
1861                         }
1862
1863                         for ( i = 0; i < last; i++ ) {
1864                                 struct berval   pval;
1865                                 int             rc;
1866
1867                                 if ( pretty ) {
1868                                         rc = pretty( attr->a_desc->ad_type->sat_syntax,
1869                                                 &attr->a_vals[i], &pval, NULL );
1870
1871                                 } else {
1872                                         rc = validate( attr->a_desc->ad_type->sat_syntax,
1873                                                 &attr->a_vals[i] );
1874                                 }
1875
1876                                 if ( rc ) {
1877                                         LBER_FREE( attr->a_vals[i].bv_val );
1878                                         if ( --last == i ) {
1879                                                 BER_BVZERO( &attr->a_vals[ i ] );
1880                                                 break;
1881                                         }
1882                                         attr->a_vals[i] = attr->a_vals[last];
1883                                         BER_BVZERO( &attr->a_vals[last] );
1884                                         i--;
1885                                         continue;
1886                                 }
1887
1888                                 if ( pretty ) {
1889                                         LBER_FREE( attr->a_vals[i].bv_val );
1890                                         attr->a_vals[i] = pval;
1891                                 }
1892                         }
1893
1894                         if ( last == 0 && attr->a_vals != &slap_dummy_bv ) {
1895                                 attr_free( attr );
1896                                 goto next_attr;
1897                         }
1898                 }
1899
1900                 if ( last && attr->a_desc->ad_type->sat_equality &&
1901                         attr->a_desc->ad_type->sat_equality->smr_normalize )
1902                 {
1903                         int i;
1904
1905                         attr->a_nvals = ch_malloc( ( last + 1 ) * sizeof( struct berval ) );
1906                         for ( i = 0; i<last; i++ ) {
1907                                 attr->a_desc->ad_type->sat_equality->smr_normalize(
1908                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
1909                                         attr->a_desc->ad_type->sat_syntax,
1910                                         attr->a_desc->ad_type->sat_equality,
1911                                         &attr->a_vals[i], &attr->a_nvals[i],
1912                                         NULL );
1913                         }
1914                         BER_BVZERO( &attr->a_nvals[i] );
1915
1916                 } else {
1917                         attr->a_nvals = attr->a_vals;
1918                 }
1919
1920                 *attrp = attr;
1921                 attrp = &attr->a_next;
1922 next_attr:;
1923         }
1924         rs->sr_entry = &ent;
1925         rs->sr_attrs = op->ors_attrs;
1926         rs->sr_flags = 0;
1927         rs->sr_err = LDAP_SUCCESS;
1928         rc = send_search_entry( op, rs );
1929         switch ( rc ) {
1930         case LDAP_UNAVAILABLE:
1931                 rc = LDAP_OTHER;
1932                 break;
1933         }
1934         rs->sr_entry = NULL;
1935         rs->sr_attrs = NULL;
1936
1937         if ( !BER_BVISNULL( &ent.e_name ) ) {
1938                 free( ent.e_name.bv_val );
1939                 BER_BVZERO( &ent.e_name );
1940         }
1941         if ( !BER_BVISNULL( &ent.e_nname ) ) {
1942                 free( ent.e_nname.bv_val );
1943                 BER_BVZERO( &ent.e_nname );
1944         }
1945         entry_clean( &ent );
1946
1947         return rc;
1948 }
1949