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_ERR = -1,
  56         META_SEARCH_NOT_CANDIDATE,
  57         META_SEARCH_CANDIDATE,
  58         META_SEARCH_BINDING,
  59         META_SEARCH_NEED_BIND
  60 } meta_search_candidate_t;
  61
  62 /*
  63  * meta_search_dobind_init()
  64  *
  65  * initiates bind for a candidate target of a search.
  66  */
  67 static meta_search_candidate_t
  68 meta_search_dobind_init(
  69         Operation               *op,
  70         SlapReply               *rs,
  71         metaconn_t              **mcp,
  72         int                     candidate,
  73         SlapReply               *candidates )
  74 {
  75         metaconn_t              *mc = *mcp;
  76         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
  77         metatarget_t            *mt = mi->mi_targets[ candidate ];
  78         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
  79
  80         struct berval           binddn = msc->msc_bound_ndn,
  81                                 cred = msc->msc_cred;
  82         int                     method;
  83
  84         int                     rc;
  85
  86         meta_search_candidate_t retcode;
  87
  88         Debug( LDAP_DEBUG_TRACE, "%s >>> meta_search_dobind_init[%d]\n",
  89                 op->o_log_prefix, candidate, 0 );
  90
  91         /*
  92          * all the targets are already bound as pseudoroot
  93          */
  94         if ( mc->mc_authz_target == META_BOUND_ALL ) {
  95                 return META_SEARCH_CANDIDATE;
  96         }
  97
  98         retcode = META_SEARCH_BINDING;
  99         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 100         if ( LDAP_BACK_CONN_ISBOUND( msc ) || LDAP_BACK_CONN_ISANON( msc ) ) {
 101                 /* already bound (or anonymous) */
 102
 103 #ifdef DEBUG_205
 104                 char    buf[ SLAP_TEXT_BUFLEN ] = { '\0' };
 105                 int     bound = 0;
 106
 107                 if ( LDAP_BACK_CONN_ISBOUND( msc ) ) {
 108                         bound = 1;
 109                 }
 110
 111                 snprintf( buf, sizeof( buf ), " mc=%p ld=%p%s DN=\"%s\"",
 112                         (void *)mc, (void *)msc->msc_ld,
 113                         bound ? " bound" : " anonymous",
 114                         bound == 0 ? "" : msc->msc_bound_ndn.bv_val );
 115                 Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
 116                         op->o_log_prefix, candidate, buf );
 117 #endif /* DEBUG_205 */
 118
 119                 retcode = META_SEARCH_CANDIDATE;
 120
 121         } else if ( META_BACK_CONN_CREATING( msc ) || LDAP_BACK_CONN_BINDING( msc ) ) {
 122                 /* another thread is binding the target for this conn; wait */
 123
 124 #ifdef DEBUG_205
 125                 char    buf[ SLAP_TEXT_BUFLEN ] = { '\0' };
 126
 127                 snprintf( buf, sizeof( buf ), " mc=%p ld=%p needbind",
 128                         (void *)mc, (void *)msc->msc_ld );
 129                 Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
 130                         op->o_log_prefix, candidate, buf );
 131 #endif /* DEBUG_205 */
 132
 133                 candidates[ candidate ].sr_msgid = META_MSGID_NEED_BIND;
 134                 retcode = META_SEARCH_NEED_BIND;
 135
 136         } else {
 137                 /* we'll need to bind the target for this conn */
 138
 139 #ifdef DEBUG_205
 140                 char buf[ SLAP_TEXT_BUFLEN ];
 141
 142                 snprintf( buf, sizeof( buf ), " mc=%p ld=%p binding",
 143                         (void *)mc, (void *)msc->msc_ld );
 144                 Debug( LDAP_DEBUG_ANY, "### %s meta_search_dobind_init[%d]%s\n",
 145                         op->o_log_prefix, candidate, buf );
 146 #endif /* DEBUG_205 */
 147
 148                 if ( msc->msc_ld == NULL ) {
 149                         /* for some reason (e.g. because formerly in "binding"
 150                          * state, with eventual connection expiration or invalidation)
 151                          * it was not initialized as expected */
 152
 153                         Debug( LDAP_DEBUG_ANY, "%s meta_search_dobind_init[%d] mc=%p ld=NULL\n",
 154                                 op->o_log_prefix, candidate, (void *)mc );
 155
 156                         rc = meta_back_init_one_conn( op, rs, *mcp, candidate,
 157                                 LDAP_BACK_CONN_ISPRIV( *mcp ), LDAP_BACK_DONTSEND, 0 );
 158                         switch ( rc ) {
 159                         case LDAP_SUCCESS:
 160                                 assert( msc->msc_ld != NULL );
 161                                 break;
 162
 163                         case LDAP_SERVER_DOWN:
 164                         case LDAP_UNAVAILABLE:
 165                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 166                                 goto down;
 167
 168                         default:
 169                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 170                                 goto other;
 171                         }
 172                 }
 173
 174                 LDAP_BACK_CONN_BINDING_SET( msc );
 175         }
 176
 177         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 178
 179         if ( retcode != META_SEARCH_BINDING ) {
 180                 return retcode;
 181         }
 182
 183         /* NOTE: this obsoletes pseudorootdn */
 184         if ( op->o_conn != NULL &&
 185                 !op->o_do_not_cache &&
 186                 ( BER_BVISNULL( &msc->msc_bound_ndn ) ||
 187                         BER_BVISEMPTY( &msc->msc_bound_ndn ) ||
 188                         ( mt->mt_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 189         {
 190                 rc = meta_back_proxy_authz_cred( mc, candidate, op, rs, LDAP_BACK_DONTSEND, &binddn, &cred, &method );
 191                 if ( rc != LDAP_SUCCESS ) {
 192                         goto down;
 193                 }
 194
 195                 /* NOTE: we copy things here, even if bind didn't succeed yet,
 196                  * because the connection is not shared until bind is over */
 197                 if ( !BER_BVISNULL( &binddn ) ) {
 198                         ber_bvreplace( &msc->msc_bound_ndn, &binddn );
 199                         if ( LDAP_BACK_SAVECRED( mi ) && !BER_BVISNULL( &cred ) ) {
 200                                 if ( !BER_BVISNULL( &msc->msc_cred ) ) {
 201                                         memset( msc->msc_cred.bv_val, 0,
 202                                                 msc->msc_cred.bv_len );
 203                                 }
 204                                 ber_bvreplace( &msc->msc_cred, &cred );
 205                         }
 206                 }
 207
 208                 if ( LDAP_BACK_CONN_ISBOUND( msc ) ) {
 209                         /* apparently, idassert was configured with SASL bind,
 210                          * so bind occurred inside meta_back_proxy_authz_cred() */
 211                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 212                         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 213                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 214                         return META_SEARCH_CANDIDATE;
 215                 }
 216
 217                 /* paranoid */
 218                 switch ( method ) {
 219                 case LDAP_AUTH_NONE:
 220                 case LDAP_AUTH_SIMPLE:
 221                         /* do a simple bind with binddn, cred */
 222                         break;
 223
 224                 default:
 225                         assert( 0 );
 226                         break;
 227                 }
 228         }
 229
 230         assert( msc->msc_ld != NULL );
 231
 232         /* connect must be async */
 233 retry:;
 234         ldap_set_option( msc->msc_ld, LDAP_OPT_CONNECT_ASYNC, LDAP_OPT_ON );
 235
 236         rc = ldap_sasl_bind( msc->msc_ld, binddn.bv_val, LDAP_SASL_SIMPLE, &cred,
 237                         NULL, NULL, &candidates[ candidate ].sr_msgid );
 238
 239 #ifdef DEBUG_205
 240         {
 241                 char buf[ SLAP_TEXT_BUFLEN ];
 242
 243                 snprintf( buf, sizeof( buf ), "meta_search_dobind_init[%d] mc=%p ld=%p rc=%d",
 244                         candidate, (void *)mc, (void *)mc->mc_conns[ candidate ].msc_ld, rc );
 245                 Debug( LDAP_DEBUG_ANY, "### %s %s\n",
 246                         op->o_log_prefix, buf, 0 );
 247         }
 248 #endif /* DEBUG_205 */
 249
 250         switch ( rc ) {
 251         case LDAP_SUCCESS:
 252                 assert( candidates[ candidate ].sr_msgid >= 0 );
 253                 META_BINDING_SET( &candidates[ candidate ] );
 254                 return META_SEARCH_BINDING;
 255
 256         case LDAP_X_CONNECTING:
 257                 /* must retry, same conn */
 258                 candidates[ candidate ].sr_msgid = META_MSGID_NEED_BIND;
 259                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 260                 LDAP_BACK_CONN_BINDING_CLEAR( msc );
 261                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 262                 return META_SEARCH_NEED_BIND;
 263
 264         case LDAP_SERVER_DOWN:
 265 down:;
 266                 /* This is the worst thing that could happen:
 267                  * the search will wait until the retry is over. */
 268                 if ( !META_IS_RETRYING( &candidates[ candidate ] ) ) {
 269                         META_RETRYING_SET( &candidates[ candidate ] );
 270
 271                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 272
 273                         assert( mc->mc_refcnt > 0 );
 274                         if ( LogTest( LDAP_DEBUG_ANY ) ) {
 275                                 char    buf[ SLAP_TEXT_BUFLEN ];
 276
 277                                 /* this lock is required; however,
 278                                  * it's invoked only when logging is on */
 279                                 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex );
 280                                 snprintf( buf, sizeof( buf ),
 281                                         "retrying URI=\"%s\" DN=\"%s\"",
 282                                         mt->mt_uri,
 283                                         BER_BVISNULL( &msc->msc_bound_ndn ) ?
 284                                                 "" : msc->msc_bound_ndn.bv_val );
 285                                 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex );
 286
 287                                 Debug( LDAP_DEBUG_ANY,
 288                                         "%s meta_search_dobind_init[%d]: %s.\n",
 289                                         op->o_log_prefix, candidate, buf );
 290                         }
 291
 292                         meta_clear_one_candidate( op, mc, candidate );
 293                         LDAP_BACK_CONN_ISBOUND_CLEAR( msc );
 294
 295                         ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn );
 296
 297                         /* mc here must be the regular mc, reset and ready for init */
 298                         rc = meta_back_init_one_conn( op, rs, mc, candidate,
 299                                 LDAP_BACK_CONN_ISPRIV( mc ), LDAP_BACK_DONTSEND, 0 );
 300
 301                         LDAP_BACK_CONN_BINDING_SET( msc );
 302                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 303
 304                         goto retry;
 305                 }
 306
 307                 if ( *mcp == NULL ) {
 308                         retcode = META_SEARCH_ERR;
 309                         rs->sr_err = LDAP_UNAVAILABLE;
 310                         break;
 311                 }
 312                 /* fall thru */
 313
 314         default:
 315 other:;
 316                 rs->sr_err = rc;
 317                 rc = slap_map_api2result( rs );
 318
 319                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 320                 meta_clear_one_candidate( op, mc, candidate );
 321                 candidates[ candidate ].sr_err = rc;
 322                 if ( META_BACK_ONERR_STOP( mi ) ) {
 323                         LDAP_BACK_CONN_TAINTED_SET( mc );
 324                         meta_back_release_conn_lock( op, mc, 0 );
 325                         *mcp = NULL;
 326                         rs->sr_err = rc;
 327
 328                         retcode = META_SEARCH_ERR;
 329
 330                 } else {
 331                         retcode = META_SEARCH_NOT_CANDIDATE;
 332                 }
 333                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 334                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 335                 break;
 336         }
 337
 338         return retcode;
 339 }
 340
 341 static meta_search_candidate_t
 342 meta_search_dobind_result(
 343         Operation               *op,
 344         SlapReply               *rs,
 345         metaconn_t              **mcp,
 346         int                     candidate,
 347         SlapReply               *candidates,
 348         LDAPMessage             *res )
 349 {
 350         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 351         metaconn_t              *mc = *mcp;
 352         metasingleconn_t        *msc = &mc->mc_conns[ candidate ];
 353
 354         meta_search_candidate_t retcode = META_SEARCH_NOT_CANDIDATE;
 355         int                     rc;
 356
 357         assert( msc->msc_ld != NULL );
 358
 359         /* FIXME: matched? referrals? response controls? */
 360         rc = ldap_parse_result( msc->msc_ld, res,
 361                 &candidates[ candidate ].sr_err,
 362                 NULL, NULL, NULL, NULL, 0 );
 363         if ( rc != LDAP_SUCCESS ) {
 364                 candidates[ candidate ].sr_err = rc;
 365
 366         } else {
 367                 rc = slap_map_api2result( &candidates[ candidate ] );
 368         }
 369
 370         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 371         LDAP_BACK_CONN_BINDING_CLEAR( msc );
 372         if ( rc != LDAP_SUCCESS ) {
 373                 meta_clear_one_candidate( op, mc, candidate );
 374                 candidates[ candidate ].sr_err = rc;
 375                 if ( META_BACK_ONERR_STOP( mi ) ) {
 376                         LDAP_BACK_CONN_TAINTED_SET( mc );
 377                         meta_back_release_conn_lock( op, mc, 0 );
 378                         *mcp = NULL;
 379                         retcode = META_SEARCH_ERR;
 380                         rs->sr_err = rc;
 381                 }
 382
 383         } else {
 384                 /* FIXME: check if bound as idassert authcDN! */
 385                 if ( BER_BVISNULL( &msc->msc_bound_ndn )
 386                         || BER_BVISEMPTY( &msc->msc_bound_ndn ) )
 387                 {
 388                         LDAP_BACK_CONN_ISANON_SET( msc );
 389
 390                 } else {
 391                         LDAP_BACK_CONN_ISBOUND_SET( msc );
 392                 }
 393                 retcode = META_SEARCH_CANDIDATE;
 394
 395                 /* connect must be async */
 396                 ldap_set_option( msc->msc_ld, LDAP_OPT_CONNECT_ASYNC, LDAP_OPT_OFF );
 397         }
 398
 399         candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 400         META_BINDING_CLEAR( &candidates[ candidate ] );
 401
 402         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 403
 404         return retcode;
 405 }
 406
 407 static meta_search_candidate_t
 408 meta_back_search_start(
 409         Operation               *op,
 410         SlapReply               *rs,
 411         dncookie                *dc,
 412         metaconn_t              **mcp,
 413         int                     candidate,
 414         SlapReply               *candidates )
 415 {
 416         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
 417         metatarget_t            *mt = mi->mi_targets[ candidate ];
 418         metasingleconn_t        *msc = &(*mcp)->mc_conns[ candidate ];
 419         struct berval           realbase = op->o_req_dn;
 420         int                     realscope = op->ors_scope;
 421         struct berval           mbase = BER_BVNULL;
 422         struct berval           mfilter = BER_BVNULL;
 423         char                    **mapped_attrs = NULL;
 424         int                     rc;
 425         meta_search_candidate_t retcode;
 426         struct timeval          tv, *tvp = NULL;
 427         int                     nretries = 1;
 428         LDAPControl             **ctrls = NULL;
 429
 430         /* this should not happen; just in case... */
 431         if ( msc->msc_ld == NULL ) {
 432                 Debug( LDAP_DEBUG_ANY,
 433                         "%s: meta_back_search_start candidate=%d ld=NULL%s.\n",
 434                         op->o_log_prefix, candidate,
 435                         META_BACK_ONERR_STOP( mi ) ? "" : " (ignored)" );
 436                 candidates[ candidate ].sr_err = LDAP_OTHER;
 437                 if ( META_BACK_ONERR_STOP( mi ) ) {
 438                         return META_SEARCH_ERR;
 439                 }
 440                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 441                 return META_SEARCH_NOT_CANDIDATE;
 442         }
 443
 444         Debug( LDAP_DEBUG_TRACE, "%s >>> meta_back_search_start[%d]\n", op->o_log_prefix, candidate, 0 );
 445
 446         /*
 447          * modifies the base according to the scope, if required
 448          */
 449         if ( mt->mt_nsuffix.bv_len > op->o_req_ndn.bv_len ) {
 450                 switch ( op->ors_scope ) {
 451                 case LDAP_SCOPE_SUBTREE:
 452                         /*
 453                          * make the target suffix the new base
 454                          * FIXME: this is very forgiving, because
 455                          * "illegal" searchBases may be turned
 456                          * into the suffix of the target; however,
 457                          * the requested searchBase already passed
 458                          * thru the candidate analyzer...
 459                          */
 460                         if ( dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) ) {
 461                                 realbase = mt->mt_nsuffix;
 462                                 if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 463                                         realscope = LDAP_SCOPE_SUBORDINATE;
 464                                 }
 465
 466                         } else {
 467                                 /*
 468                                  * this target is no longer candidate
 469                                  */
 470                                 retcode = META_SEARCH_NOT_CANDIDATE;
 471                                 goto doreturn;
 472                         }
 473                         break;
 474
 475                 case LDAP_SCOPE_SUBORDINATE:
 476                 case LDAP_SCOPE_ONELEVEL:
 477                 {
 478                         struct berval   rdn = mt->mt_nsuffix;
 479                         rdn.bv_len -= op->o_req_ndn.bv_len + STRLENOF( "," );
 480                         if ( dnIsOneLevelRDN( &rdn )
 481                                         && dnIsSuffix( &mt->mt_nsuffix, &op->o_req_ndn ) )
 482                         {
 483                                 /*
 484                                  * if there is exactly one level,
 485                                  * make the target suffix the new
 486                                  * base, and make scope "base"
 487                                  */
 488                                 realbase = mt->mt_nsuffix;
 489                                 if ( op->ors_scope == LDAP_SCOPE_SUBORDINATE ) {
 490                                         if ( mt->mt_scope == LDAP_SCOPE_SUBORDINATE ) {
 491                                                 realscope = LDAP_SCOPE_SUBORDINATE;
 492                                         } else {
 493                                                 realscope = LDAP_SCOPE_SUBTREE;
 494                                         }
 495                                 } else {
 496                                         realscope = LDAP_SCOPE_BASE;
 497                                 }
 498                                 break;
 499                         } /* else continue with the next case */
 500                 }
 501
 502                 case LDAP_SCOPE_BASE:
 503                         /*
 504                          * this target is no longer candidate
 505                          */
 506                         retcode = META_SEARCH_NOT_CANDIDATE;
 507                         goto doreturn;
 508                 }
 509         }
 510
 511         /* initiate dobind */
 512         retcode = meta_search_dobind_init( op, rs, mcp, candidate, candidates );
 513
 514         Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%d]=%d\n", op->o_log_prefix, candidate, retcode );
 515
 516         if ( retcode != META_SEARCH_CANDIDATE ) {
 517                 goto doreturn;
 518         }
 519
 520         /*
 521          * Rewrite the search base, if required
 522          */
 523         dc->target = mt;
 524         dc->ctx = "searchBase";
 525         switch ( ldap_back_dn_massage( dc, &realbase, &mbase ) ) {
 526         case LDAP_SUCCESS:
 527                 break;
 528
 529         case LDAP_UNWILLING_TO_PERFORM:
 530                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 531                 rs->sr_text = "Operation not allowed";
 532                 send_ldap_result( op, rs );
 533                 retcode = META_SEARCH_ERR;
 534                 goto doreturn;
 535
 536         default:
 537
 538                 /*
 539                  * this target is no longer candidate
 540                  */
 541                 retcode = META_SEARCH_NOT_CANDIDATE;
 542                 goto doreturn;
 543         }
 544
 545         /*
 546          * Maps filter
 547          */
 548         rc = ldap_back_filter_map_rewrite( dc, op->ors_filter,
 549                         &mfilter, BACKLDAP_MAP );
 550         switch ( rc ) {
 551         case LDAP_SUCCESS:
 552                 break;
 553
 554         case LDAP_COMPARE_FALSE:
 555         default:
 556                 /*
 557                  * this target is no longer candidate
 558                  */
 559                 retcode = META_SEARCH_NOT_CANDIDATE;
 560                 goto done;
 561         }
 562
 563         /*
 564          * Maps required attributes
 565          */
 566         rc = ldap_back_map_attrs( &mt->mt_rwmap.rwm_at,
 567                         op->ors_attrs, BACKLDAP_MAP, &mapped_attrs );
 568         if ( rc != LDAP_SUCCESS ) {
 569                 /*
 570                  * this target is no longer candidate
 571                  */
 572                 retcode = META_SEARCH_NOT_CANDIDATE;
 573                 goto done;
 574         }
 575
 576         /* should we check return values? */
 577         if ( op->ors_deref != -1 ) {
 578                 assert( msc->msc_ld != NULL );
 579                 (void)ldap_set_option( msc->msc_ld, LDAP_OPT_DEREF,
 580                                 ( void * )&op->ors_deref );
 581         }
 582
 583         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 584                 tv.tv_sec = op->ors_tlimit > 0 ? op->ors_tlimit : 1;
 585                 tv.tv_usec = 0;
 586                 tvp = &tv;
 587         }
 588
 589 retry:;
 590         ctrls = op->o_ctrls;
 591         if ( ldap_back_proxy_authz_ctrl( &msc->msc_bound_ndn,
 592                 mt->mt_version, &mt->mt_idassert, op, rs, &ctrls )
 593                 != LDAP_SUCCESS )
 594         {
 595                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 596                 retcode = META_SEARCH_NOT_CANDIDATE;
 597                 goto done;
 598         }
 599
 600         /*
 601          * Starts the search
 602          */
 603         assert( msc->msc_ld != NULL );
 604         rc = ldap_search_ext( msc->msc_ld,
 605                         mbase.bv_val, realscope, mfilter.bv_val,
 606                         mapped_attrs, op->ors_attrsonly,
 607                         ctrls, NULL, tvp, op->ors_slimit,
 608                         &candidates[ candidate ].sr_msgid );
 609         switch ( rc ) {
 610         case LDAP_SUCCESS:
 611                 retcode = META_SEARCH_CANDIDATE;
 612                 break;
 613
 614         case LDAP_SERVER_DOWN:
 615                 if ( nretries && meta_back_retry( op, rs, mcp, candidate, LDAP_BACK_DONTSEND ) ) {
 616                         nretries = 0;
 617                         /* if the identity changed, there might be need to re-authz */
 618                         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 619                         goto retry;
 620                 }
 621
 622                 if ( *mcp == NULL ) {
 623                         retcode = META_SEARCH_ERR;
 624                         break;
 625                 }
 626                 /* fall thru */
 627
 628         default:
 629                 candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
 630                 retcode = META_SEARCH_NOT_CANDIDATE;
 631         }
 632
 633 done:;
 634         (void)ldap_back_proxy_authz_ctrl_free( op, &ctrls );
 635
 636         if ( mapped_attrs ) {
 637                 free( mapped_attrs );
 638         }
 639         if ( mfilter.bv_val != op->ors_filterstr.bv_val ) {
 640                 free( mfilter.bv_val );
 641         }
 642         if ( mbase.bv_val != realbase.bv_val ) {
 643                 free( mbase.bv_val );
 644         }
 645
 646 doreturn:;
 647         Debug( LDAP_DEBUG_TRACE, "%s <<< meta_back_search_start[%d]=%d\n", op->o_log_prefix, candidate, retcode );
 648
 649         return retcode;
 650 }
 651
 652 int
 653 meta_back_search( Operation *op, SlapReply *rs )
 654 {
 655         metainfo_t      *mi = ( metainfo_t * )op->o_bd->be_private;
 656         metaconn_t      *mc;
 657         struct timeval  save_tv = { 0, 0 },
 658                         tv;
 659         time_t          stoptime = (time_t)-1;
 660         int             rc = 0, sres = LDAP_SUCCESS;
 661         char            *matched = NULL;
 662         int             last = 0, ncandidates = 0,
 663                         initial_candidates = 0, candidate_match = 0,
 664                         needbind = 0;
 665         ldap_back_send_t        sendok = LDAP_BACK_SENDERR;
 666         long            i;
 667         dncookie        dc;
 668         int             is_ok = 0;
 669         void            *savepriv;
 670         SlapReply       *candidates = meta_back_candidates_get( op );
 671
 672         /*
 673          * controls are set in ldap_back_dobind()
 674          *
 675          * FIXME: in case of values return filter, we might want
 676          * to map attrs and maybe rewrite value
 677          */
 678 getconn:;
 679         mc = meta_back_getconn( op, rs, NULL, sendok );
 680         if ( !mc ) {
 681                 return rs->sr_err;
 682         }
 683
 684         dc.conn = op->o_conn;
 685         dc.rs = rs;
 686
 687         /*
 688          * Inits searches
 689          */
 690         for ( i = 0; i < mi->mi_ntargets; i++ ) {
 691                 /* reset sr_msgid; it is used in most loops
 692                  * to check if that target is still to be considered */
 693                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 694
 695                 /* a target is marked as candidate by meta_back_getconn();
 696                  * if for any reason (an error, it's over or so) it is
 697                  * no longer active, sr_msgid is set to META_MSGID_IGNORE
 698                  * but it remains candidate, which means it has been active
 699                  * at some point during the operation.  This allows to
 700                  * use its response code and more to compute the final
 701                  * response */
 702                 if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
 703                         continue;
 704                 }
 705
 706                 candidates[ i ].sr_matched = NULL;
 707                 candidates[ i ].sr_text = NULL;
 708                 candidates[ i ].sr_ref = NULL;
 709                 candidates[ i ].sr_ctrls = NULL;
 710         }
 711
 712         for ( i = 0; i < mi->mi_ntargets; i++ ) {
 713                 if ( !META_IS_CANDIDATE( &candidates[ i ] )
 714                         || candidates[ i ].sr_err != LDAP_SUCCESS )
 715                 {
 716                         continue;
 717                 }
 718
 719                 switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
 720                 {
 721                 case META_SEARCH_NOT_CANDIDATE:
 722                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 723                         break;
 724
 725                 case META_SEARCH_NEED_BIND:
 726                         ++needbind;
 727                         /* fallthru */
 728
 729                 case META_SEARCH_CANDIDATE:
 730                 case META_SEARCH_BINDING:
 731                         candidates[ i ].sr_type = REP_INTERMEDIATE;
 732                         ++ncandidates;
 733                         break;
 734
 735                 case META_SEARCH_ERR:
 736                         savepriv = op->o_private;
 737                         op->o_private = (void *)i;
 738                         send_ldap_result( op, rs );
 739                         op->o_private = savepriv;
 740                         rc = -1;
 741                         goto finish;
 742                 }
 743         }
 744
 745         if ( ncandidates > 0 && needbind == ncandidates ) {
 746                 /*
 747                  * give up the second time...
 748                  *
 749                  * NOTE: this should not occur the second time, since a fresh
 750                  * connection has ben created; however, targets may also
 751                  * need bind because the bind timed out or so.
 752                  */
 753                 if ( sendok & LDAP_BACK_BINDING ) {
 754                         Debug( LDAP_DEBUG_ANY,
 755                                 "%s meta_back_search: unable to initialize conn\n",
 756                                 op->o_log_prefix, 0, 0 );
 757                         rs->sr_err = LDAP_UNAVAILABLE;
 758                         rs->sr_text = "unable to initialize connection to remote targets";
 759                         send_ldap_result( op, rs );
 760                         rc = -1;
 761                         goto finish;
 762                 }
 763
 764                 /* FIXME: better create a separate connection? */
 765                 sendok |= LDAP_BACK_BINDING;
 766
 767 #ifdef DEBUG_205
 768                 Debug( LDAP_DEBUG_ANY, "*** %s drop mc=%p create new connection\n",
 769                         op->o_log_prefix, (void *)mc, 0 );
 770 #endif /* DEBUG_205 */
 771
 772                 meta_back_release_conn( op, mc );
 773                 mc = NULL;
 774
 775                 needbind = 0;
 776                 ncandidates = 0;
 777
 778                 goto getconn;
 779         }
 780
 781         initial_candidates = ncandidates;
 782
 783         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 784                 char    cnd[ SLAP_TEXT_BUFLEN ];
 785                 int     c;
 786
 787                 for ( c = 0; c < mi->mi_ntargets; c++ ) {
 788                         if ( META_IS_CANDIDATE( &candidates[ c ] ) ) {
 789                                 cnd[ c ] = '*';
 790                         } else {
 791                                 cnd[ c ] = ' ';
 792                         }
 793                 }
 794                 cnd[ c ] = '\0';
 795
 796                 Debug( LDAP_DEBUG_TRACE, "%s meta_back_search: ncandidates=%d "
 797                         "cnd=\"%s\"\n", op->o_log_prefix, ncandidates, cnd );
 798         }
 799
 800         if ( initial_candidates == 0 ) {
 801                 /* NOTE: here we are not sending any matchedDN;
 802                  * this is intended, because if the back-meta
 803                  * is serving this search request, but no valid
 804                  * candidate could be looked up, it means that
 805                  * there is a hole in the mapping of the targets
 806                  * and thus no knowledge of any remote superior
 807                  * is available */
 808                 Debug( LDAP_DEBUG_ANY, "%s meta_back_search: "
 809                         "base=\"%s\" scope=%d: "
 810                         "no candidate could be selected\n",
 811                         op->o_log_prefix, op->o_req_dn.bv_val,
 812                         op->ors_scope );
 813
 814                 /* FIXME: we're sending the first error we encounter;
 815                  * maybe we should pick the worst... */
 816                 rc = LDAP_NO_SUCH_OBJECT;
 817                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
 818                         if ( META_IS_CANDIDATE( &candidates[ i ] )
 819                                 && candidates[ i ].sr_err != LDAP_SUCCESS )
 820                         {
 821                                 rc = candidates[ i ].sr_err;
 822                                 break;
 823                         }
 824                 }
 825
 826                 send_ldap_error( op, rs, rc, NULL );
 827
 828                 goto finish;
 829         }
 830
 831         /* We pull apart the ber result, stuff it into a slapd entry, and
 832          * let send_search_entry stuff it back into ber format. Slow & ugly,
 833          * but this is necessary for version matching, and for ACL processing.
 834          */
 835
 836         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 837                 stoptime = op->o_time + op->ors_tlimit;
 838         }
 839
 840         /*
 841          * In case there are no candidates, no cycle takes place...
 842          *
 843          * FIXME: we might use a queue, to better balance the load
 844          * among the candidates
 845          */
 846         for ( rc = 0; ncandidates > 0; ) {
 847                 int     gotit = 0,
 848                         doabandon = 0,
 849                         alreadybound = ncandidates;
 850
 851                 /* check time limit */
 852                 if ( op->ors_tlimit != SLAP_NO_LIMIT
 853                                 && slap_get_time() > stoptime )
 854                 {
 855                         doabandon = 1;
 856                         rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 857                         savepriv = op->o_private;
 858                         op->o_private = (void *)i;
 859                         send_ldap_result( op, rs );
 860                         op->o_private = savepriv;
 861                         goto finish;
 862                 }
 863
 864                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
 865                         metasingleconn_t        *msc = &mc->mc_conns[ i ];
 866                         LDAPMessage             *res = NULL, *msg;
 867
 868                         /* if msgid is invalid, don't ldap_result() */
 869                         if ( candidates[ i ].sr_msgid == META_MSGID_IGNORE ) {
 870                                 continue;
 871                         }
 872
 873                         /* if target still needs bind, retry */
 874                         if ( candidates[ i ].sr_msgid == META_MSGID_NEED_BIND ) {
 875                                 meta_search_candidate_t retcode;
 876
 877                                 /* initiate dobind */
 878                                 retcode = meta_search_dobind_init( op, rs, &mc, i, candidates );
 879
 880                                 Debug( LDAP_DEBUG_TRACE, "%s <<< meta_search_dobind_init[%ld]=%d\n",
 881                                         op->o_log_prefix, i, retcode );
 882
 883                                 switch ( retcode ) {
 884                                 case META_SEARCH_NEED_BIND:
 885                                         alreadybound--;
 886                                         /* fallthru */
 887
 888                                 case META_SEARCH_BINDING:
 889                                         break;
 890
 891                                 case META_SEARCH_ERR:
 892                                         candidates[ i ].sr_err = rs->sr_err;
 893                                         if ( META_BACK_ONERR_STOP( mi ) ) {
 894                                                 savepriv = op->o_private;
 895                                                 op->o_private = (void *)i;
 896                                                 send_ldap_result( op, rs );
 897                                                 op->o_private = savepriv;
 898                                                 goto finish;
 899                                         }
 900                                         /* fallthru */
 901
 902                                 case META_SEARCH_NOT_CANDIDATE:
 903                                         /*
 904                                          * When no candidates are left,
 905                                          * the outer cycle finishes
 906                                          */
 907                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 908                                         assert( ncandidates > 0 );
 909                                         --ncandidates;
 910                                         break;
 911
 912                                 case META_SEARCH_CANDIDATE:
 913                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 914                                         switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
 915                                         {
 916                                         case META_SEARCH_CANDIDATE:
 917                                                 assert( candidates[ i ].sr_msgid >= 0 );
 918                                                 break;
 919
 920                                         case META_SEARCH_ERR:
 921                                                 candidates[ i ].sr_err = rs->sr_err;
 922                                                 if ( META_BACK_ONERR_STOP( mi ) ) {
 923                                                         savepriv = op->o_private;
 924                                                         op->o_private = (void *)i;
 925                                                         send_ldap_result( op, rs );
 926                                                         op->o_private = savepriv;
 927                                                         goto finish;
 928                                                 }
 929                                                 /* fallthru */
 930
 931                                         case META_SEARCH_NOT_CANDIDATE:
 932                                                 /* means that meta_back_search_start()
 933                                                  * failed but onerr == continue */
 934                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
 935                                                 assert( ncandidates > 0 );
 936                                                 --ncandidates;
 937                                                 break;
 938
 939                                         default:
 940                                                 /* impossible */
 941                                                 assert( 0 );
 942                                                 break;
 943                                         }
 944                                         break;
 945
 946                                 default:
 947                                         /* impossible */
 948                                         assert( 0 );
 949                                         break;
 950                                 }
 951                                 continue;
 952                         }
 953
 954                         /* check for abandon */
 955                         if ( op->o_abandon ) {
 956                                 break;
 957                         }
 958
 959 #ifdef DEBUG_205
 960                         if ( msc->msc_ld == NULL ) {
 961                                 char    buf[ SLAP_TEXT_BUFLEN ];
 962
 963                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
 964                                 snprintf( buf, sizeof( buf ),
 965                                         "%s meta_back_search[%ld] mc=%p msgid=%d%s%s%s\n",
 966                                         op->o_log_prefix, (long)i, (void *)mc,
 967                                         candidates[ i ].sr_msgid,
 968                                         META_IS_BINDING( &candidates[ i ] ) ? " binding" : "",
 969                                         LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ? " connbinding" : "",
 970                                         META_BACK_CONN_CREATING( &mc->mc_conns[ i ] ) ? " conncreating" : "" );
 971                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
 972
 973                                 Debug( LDAP_DEBUG_ANY, "!!! %s\n", buf, 0, 0 );
 974                         }
 975 #endif /* DEBUG_205 */
 976
 977                         /*
 978                          * FIXME: handle time limit as well?
 979                          * Note that target servers are likely
 980                          * to handle it, so at some time we'll
 981                          * get a LDAP_TIMELIMIT_EXCEEDED from
 982                          * one of them ...
 983                          */
 984                         tv = save_tv;
 985                         rc = ldap_result( msc->msc_ld, candidates[ i ].sr_msgid,
 986                                         LDAP_MSG_RECEIVED, &tv, &res );
 987                         switch ( rc ) {
 988                         case 0:
 989                                 /* FIXME: res should not need to be freed */
 990                                 assert( res == NULL );
 991                                 continue;
 992
 993                         case -1:
 994 really_bad:;
 995                                 /* something REALLY bad happened! */
 996                                 if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
 997                                         candidates[ i ].sr_type = REP_RESULT;
 998
 999                                         if ( meta_back_retry( op, rs, &mc, i, LDAP_BACK_DONTSEND ) ) {
1000                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1001                                                 switch ( meta_back_search_start( op, rs, &dc, &mc, i, candidates ) )
1002                                                 {
1003                                                 case META_SEARCH_CANDIDATE:
1004                                                         /* get back into business... */
1005                                                         continue;
1006
1007                                                         /* means that failed but onerr == continue */
1008                                                 case META_SEARCH_NOT_CANDIDATE:
1009                                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1010                                                         --ncandidates;
1011
1012                                                         candidates[ i ].sr_err = rs->sr_err;
1013                                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1014                                                                 savepriv = op->o_private;
1015                                                                 op->o_private = (void *)i;
1016                                                                 send_ldap_result( op, rs );
1017                                                                 op->o_private = savepriv;
1018                                                                 goto finish;
1019                                                         }
1020                                                         break;
1021
1022                                                 case META_SEARCH_BINDING:
1023                                                 case META_SEARCH_NEED_BIND:
1024                                                         assert( 0 );
1025
1026                                                 default:
1027                                                         /* unrecoverable error */
1028                                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1029                                                         rc = rs->sr_err = LDAP_OTHER;
1030                                                         goto finish;
1031                                                 }
1032                                         }
1033
1034                                         candidates[ i ].sr_err = rs->sr_err;
1035                                         if ( META_BACK_ONERR_STOP( mi ) ) {
1036                                                 savepriv = op->o_private;
1037                                                 op->o_private = (void *)i;
1038                                                 send_ldap_result( op, rs );
1039                                                 op->o_private = savepriv;
1040                                                 goto finish;
1041                                         }
1042                                 }
1043
1044                                 /*
1045                                  * When no candidates are left,
1046                                  * the outer cycle finishes
1047                                  */
1048                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1049                                 assert( ncandidates > 0 );
1050                                 --ncandidates;
1051                                 rs->sr_err = candidates[ i ].sr_err;
1052                                 continue;
1053
1054                         default:
1055                                 /* only touch when activity actually took place... */
1056                                 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) {
1057                                         msc->msc_time = op->o_time;
1058                                 }
1059                                 break;
1060                         }
1061
1062                         for ( msg = ldap_first_message( msc->msc_ld, res );
1063                                 msg != NULL;
1064                                 msg = ldap_next_message( msc->msc_ld, msg ) )
1065                         {
1066                                 rc = ldap_msgtype( msg );
1067                                 if ( rc == LDAP_RES_SEARCH_ENTRY ) {
1068                                         LDAPMessage     *e;
1069
1070                                         if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
1071                                                 /* don't retry any more... */
1072                                                 candidates[ i ].sr_type = REP_RESULT;
1073                                         }
1074
1075                                         is_ok++;
1076
1077                                         e = ldap_first_entry( msc->msc_ld, msg );
1078                                         savepriv = op->o_private;
1079                                         op->o_private = (void *)i;
1080                                         rs->sr_err = meta_send_entry( op, rs, mc, i, e );
1081
1082                                         switch ( rs->sr_err ) {
1083                                         case LDAP_SIZELIMIT_EXCEEDED:
1084                                                 savepriv = op->o_private;
1085                                                 op->o_private = (void *)i;
1086                                                 send_ldap_result( op, rs );
1087                                                 op->o_private = savepriv;
1088                                                 rs->sr_err = LDAP_SUCCESS;
1089                                                 ldap_msgfree( res );
1090                                                 res = NULL;
1091                                                 goto finish;
1092
1093                                         case LDAP_UNAVAILABLE:
1094                                                 rs->sr_err = LDAP_OTHER;
1095                                                 ldap_msgfree( res );
1096                                                 res = NULL;
1097                                                 goto finish;
1098                                         }
1099                                         op->o_private = savepriv;
1100
1101                                         /* don't wait any longer... */
1102                                         gotit = 1;
1103                                         save_tv.tv_sec = 0;
1104                                         save_tv.tv_usec = 0;
1105
1106                                 } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
1107                                         char            **references = NULL;
1108                                         int             cnt;
1109
1110                                         if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
1111                                                 /* don't retry any more... */
1112                                                 candidates[ i ].sr_type = REP_RESULT;
1113                                         }
1114
1115                                         is_ok++;
1116
1117                                         rc = ldap_parse_reference( msc->msc_ld, msg,
1118                                                         &references, &rs->sr_ctrls, 0 );
1119
1120                                         if ( rc != LDAP_SUCCESS ) {
1121                                                 continue;
1122                                         }
1123
1124                                         if ( references == NULL ) {
1125                                                 continue;
1126                                         }
1127
1128 #ifdef ENABLE_REWRITE
1129                                         dc.ctx = "referralDN";
1130 #else /* ! ENABLE_REWRITE */
1131                                         dc.tofrom = 0;
1132                                         dc.normalized = 0;
1133 #endif /* ! ENABLE_REWRITE */
1134
1135                                         /* FIXME: merge all and return at the end */
1136
1137                                         for ( cnt = 0; references[ cnt ]; cnt++ )
1138                                                 ;
1139
1140                                         rs->sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
1141
1142                                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
1143                                                 ber_str2bv( references[ cnt ], 0, 1, &rs->sr_ref[ cnt ] );
1144                                         }
1145                                         BER_BVZERO( &rs->sr_ref[ cnt ] );
1146
1147                                         ( void )ldap_back_referral_result_rewrite( &dc, rs->sr_ref );
1148
1149                                         if ( rs->sr_ref != NULL && !BER_BVISNULL( &rs->sr_ref[ 0 ] ) ) {
1150                                                 /* ignore return value by now */
1151                                                 savepriv = op->o_private;
1152                                                 op->o_private = (void *)i;
1153                                                 ( void )send_search_reference( op, rs );
1154                                                 op->o_private = savepriv;
1155
1156                                                 ber_bvarray_free( rs->sr_ref );
1157                                                 rs->sr_ref = NULL;
1158                                         }
1159
1160                                         /* cleanup */
1161                                         if ( references ) {
1162                                                 ber_memvfree( (void **)references );
1163                                         }
1164
1165                                         if ( rs->sr_ctrls ) {
1166                                                 ldap_controls_free( rs->sr_ctrls );
1167                                                 rs->sr_ctrls = NULL;
1168                                         }
1169
1170                                 } else if ( rc == LDAP_RES_SEARCH_RESULT ) {
1171                                         char            buf[ SLAP_TEXT_BUFLEN ];
1172                                         char            **references = NULL;
1173
1174                                         if ( candidates[ i ].sr_type == REP_INTERMEDIATE ) {
1175                                                 /* don't retry any more... */
1176                                                 candidates[ i ].sr_type = REP_RESULT;
1177                                         }
1178
1179                                         /* NOTE: ignores response controls
1180                                          * (and intermediate response controls
1181                                          * as well, except for those with search
1182                                          * references); this may not be correct,
1183                                          * but if they're not ignored then
1184                                          * back-meta would need to merge them
1185                                          * consistently (think of pagedResults...)
1186                                          */
1187                                         /* FIXME: response controls? */
1188                                         rs->sr_err = ldap_parse_result( msc->msc_ld,
1189                                                 msg,
1190                                                 &candidates[ i ].sr_err,
1191                                                 (char **)&candidates[ i ].sr_matched,
1192                                                 NULL /* (char **)&candidates[ i ].sr_text */ ,
1193                                                 &references,
1194                                                 NULL /* &candidates[ i ].sr_ctrls (unused) */ ,
1195                                                 0 );
1196                                         if ( rs->sr_err != LDAP_SUCCESS ) {
1197                                                 ldap_get_option( msc->msc_ld,
1198                                                         LDAP_OPT_ERROR_NUMBER,
1199                                                         &rs->sr_err );
1200                                                 sres = slap_map_api2result( rs );
1201                                                 candidates[ i ].sr_type = REP_RESULT;
1202                                                 ldap_msgfree( res );
1203                                                 res = NULL;
1204                                                 goto really_bad;
1205                                         }
1206
1207                                         /* massage matchedDN if need be */
1208                                         if ( candidates[ i ].sr_matched != NULL ) {
1209                                                 struct berval   match, mmatch;
1210
1211                                                 ber_str2bv( candidates[ i ].sr_matched,
1212                                                         0, 0, &match );
1213                                                 candidates[ i ].sr_matched = NULL;
1214
1215                                                 dc.ctx = "matchedDN";
1216                                                 dc.target = mi->mi_targets[ i ];
1217                                                 if ( !ldap_back_dn_massage( &dc, &match, &mmatch ) ) {
1218                                                         if ( mmatch.bv_val == match.bv_val ) {
1219                                                                 candidates[ i ].sr_matched
1220                                                                         = ch_strdup( mmatch.bv_val );
1221
1222                                                         } else {
1223                                                                 candidates[ i ].sr_matched = mmatch.bv_val;
1224                                                         }
1225
1226                                                         candidate_match++;
1227                                                 }
1228                                                 ldap_memfree( match.bv_val );
1229                                         }
1230
1231                                         /* add references to array */
1232                                         if ( references ) {
1233                                                 BerVarray       sr_ref;
1234                                                 int             cnt;
1235
1236                                                 for ( cnt = 0; references[ cnt ]; cnt++ )
1237                                                         ;
1238
1239                                                 sr_ref = ch_calloc( sizeof( struct berval ), cnt + 1 );
1240
1241                                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
1242                                                         ber_str2bv( references[ cnt ], 0, 1, &sr_ref[ cnt ] );
1243                                                 }
1244                                                 BER_BVZERO( &sr_ref[ cnt ] );
1245
1246                                                 ( void )ldap_back_referral_result_rewrite( &dc, sr_ref );
1247
1248                                                 /* cleanup */
1249                                                 ber_memvfree( (void **)references );
1250
1251                                                 if ( rs->sr_v2ref == NULL ) {
1252                                                         rs->sr_v2ref = sr_ref;
1253
1254                                                 } else {
1255                                                         for ( cnt = 0; !BER_BVISNULL( &sr_ref[ cnt ] ); cnt++ ) {
1256                                                                 ber_bvarray_add( &rs->sr_v2ref, &sr_ref[ cnt ] );
1257                                                         }
1258                                                         ber_memfree( sr_ref );
1259                                                 }
1260                                         }
1261
1262                                         rs->sr_err = candidates[ i ].sr_err;
1263                                         sres = slap_map_api2result( rs );
1264
1265                                         if ( LogTest( LDAP_DEBUG_TRACE | LDAP_DEBUG_ANY ) ) {
1266                                                 snprintf( buf, sizeof( buf ),
1267                                                         "%s meta_back_search[%ld] "
1268                                                         "match=\"%s\" err=%ld",
1269                                                         op->o_log_prefix, i,
1270                                                         candidates[ i ].sr_matched ? candidates[ i ].sr_matched : "",
1271                                                         (long) candidates[ i ].sr_err );
1272                                                 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) {
1273                                                         Debug( LDAP_DEBUG_TRACE, "%s.\n", buf, 0, 0 );
1274
1275                                                 } else {
1276                                                         Debug( LDAP_DEBUG_ANY, "%s (%s).\n",
1277                                                                 buf, ldap_err2string( candidates[ i ].sr_err ), 0 );
1278                                                 }
1279                                         }
1280
1281                                         switch ( sres ) {
1282                                         case LDAP_NO_SUCH_OBJECT:
1283                                                 /* is_ok is touched any time a valid
1284                                                  * (even intermediate) result is
1285                                                  * returned; as a consequence, if
1286                                                  * a candidate returns noSuchObject
1287                                                  * it is ignored and the candidate
1288                                                  * is simply demoted. */
1289                                                 if ( is_ok ) {
1290                                                         sres = LDAP_SUCCESS;
1291                                                 }
1292                                                 break;
1293
1294                                         case LDAP_SUCCESS:
1295                                         case LDAP_REFERRAL:
1296                                                 is_ok++;
1297                                                 break;
1298
1299                                         case LDAP_SIZELIMIT_EXCEEDED:
1300                                                 /* if a target returned sizelimitExceeded
1301                                                  * and the entry count is equal to the
1302                                                  * proxy's limit, the target would have
1303                                                  * returned more, and the error must be
1304                                                  * propagated to the client; otherwise,
1305                                                  * the target enforced a limit lower
1306                                                  * than what requested by the proxy;
1307                                                  * ignore it */
1308                                                 candidates[ i ].sr_err = rs->sr_err;
1309                                                 if ( rs->sr_nentries == op->ors_slimit
1310                                                         || META_BACK_ONERR_STOP( mi ) )
1311                                                 {
1312                                                         savepriv = op->o_private;
1313                                                         op->o_private = (void *)i;
1314                                                         send_ldap_result( op, rs );
1315                                                         op->o_private = savepriv;
1316                                                         ldap_msgfree( res );
1317                                                         res = NULL;
1318                                                         goto finish;
1319                                                 }
1320                                                 break;
1321
1322                                         default:
1323                                                 candidates[ i ].sr_err = rs->sr_err;
1324                                                 if ( META_BACK_ONERR_STOP( mi ) ) {
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
1336                                         last = i;
1337                                         rc = 0;
1338
1339                                         /*
1340                                          * When no candidates are left,
1341                                          * the outer cycle finishes
1342                                          */
1343                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1344                                         --ncandidates;
1345
1346                                 } else if ( rc == LDAP_RES_BIND ) {
1347                                         meta_search_candidate_t retcode;
1348
1349                                         retcode = meta_search_dobind_result( op, rs, &mc, i, candidates, msg );
1350                                         if ( retcode == META_SEARCH_CANDIDATE ) {
1351                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1352                                                 retcode = meta_back_search_start( op, rs, &dc, &mc, i, candidates );
1353                                         }
1354
1355                                         switch ( retcode ) {
1356                                         case META_SEARCH_CANDIDATE:
1357                                                 break;
1358
1359                                                 /* means that failed but onerr == continue */
1360                                         case META_SEARCH_NOT_CANDIDATE:
1361                                         case META_SEARCH_ERR:
1362                                                 candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1363                                                 --ncandidates;
1364
1365                                                 candidates[ i ].sr_err = rs->sr_err;
1366                                                 if ( META_BACK_ONERR_STOP( mi ) ) {
1367                                                         savepriv = op->o_private;
1368                                                         op->o_private = (void *)i;
1369                                                         send_ldap_result( op, rs );
1370                                                         op->o_private = savepriv;
1371                                                         ldap_msgfree( res );
1372                                                         res = NULL;
1373                                                         goto finish;
1374                                                 }
1375                                                 break;
1376
1377                                         default:
1378                                                 assert( 0 );
1379                                                 break;
1380                                         }
1381
1382                                 } else {
1383                                         assert( 0 );
1384                                         ldap_msgfree( res );
1385                                         res = NULL;
1386                                         goto really_bad;
1387                                 }
1388                         }
1389
1390                         ldap_msgfree( res );
1391                         res = NULL;
1392                 }
1393
1394                 /* check for abandon */
1395                 if ( op->o_abandon || doabandon ) {
1396                         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1397                                 if ( candidates[ i ].sr_msgid >= 0 ) {
1398                                         if ( META_IS_BINDING( &candidates[ i ] ) ) {
1399                                                 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1400                                                 if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ) {
1401                                                         /* if still binding, destroy */
1402
1403 #ifdef DEBUG_205
1404                                                         char buf[ SLAP_TEXT_BUFLEN ];
1405
1406                                                         snprintf( buf, sizeof( buf), "%s meta_back_search(abandon) "
1407                                                                 "ldap_unbind_ext[%ld] mc=%p ld=%p",
1408                                                                 op->o_log_prefix, i, (void *)mc,
1409                                                                 (void *)mc->mc_conns[i].msc_ld );
1410
1411                                                         Debug( LDAP_DEBUG_ANY, "### %s\n", buf, 0, 0 );
1412 #endif /* DEBUG_205 */
1413
1414                                                         meta_clear_one_candidate( op, mc, i );
1415                                                 }
1416                                                 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1417                                                 META_BINDING_CLEAR( &candidates[ i ] );
1418
1419                                         } else {
1420                                                 (void)meta_back_cancel( mc, op, rs,
1421                                                         candidates[ i ].sr_msgid, i,
1422                                                         LDAP_BACK_DONTSEND );
1423                                         }
1424
1425                                         candidates[ i ].sr_msgid = META_MSGID_IGNORE;
1426                                         assert( ncandidates > 0 );
1427                                         --ncandidates;
1428                                 }
1429                         }
1430
1431                         if ( op->o_abandon ) {
1432                                 rc = SLAPD_ABANDON;
1433                                 /* let send_ldap_result play cleanup handlers (ITS#4645) */
1434                                 break;
1435                         }
1436                 }
1437
1438                 /* if no entry was found during this loop,
1439                  * set a minimal timeout */
1440                 if ( ncandidates > 0 && gotit == 0 ) {
1441                         if ( save_tv.tv_sec == 0 && save_tv.tv_usec == 0 ) {
1442                                 save_tv.tv_usec = LDAP_BACK_RESULT_UTIMEOUT/initial_candidates;
1443
1444                                 /* arbitrarily limit to something between 1 and 2 minutes */
1445                         } else if ( ( stoptime == -1 && save_tv.tv_sec < 60 )
1446                                 || save_tv.tv_sec < ( stoptime - slap_get_time() ) / ( 2 * ncandidates ) )
1447                         {
1448                                 /* double the timeout */
1449                                 lutil_timermul( &save_tv, 2, &save_tv );
1450                         }
1451
1452 #if 0
1453                         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1454                                 char    buf[ SLAP_TEXT_BUFLEN ];
1455
1456                                 snprintf( buf, sizeof( buf ), "%s %ld.%06ld %d/%d mc=%p",
1457                                         op->o_log_prefix, save_tv.tv_sec, save_tv.tv_usec,
1458                                         ncandidates, initial_candidates, mc );
1459                                 Debug( LDAP_DEBUG_TRACE, "### %s\n", buf, 0, 0 );
1460                                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1461                                         if ( candidates[ i ].sr_msgid == META_MSGID_IGNORE ) {
1462                                                 continue;
1463                                         }
1464
1465                                         snprintf( buf, sizeof( buf ), "[%ld] ld=%p%s%s\n",
1466                                                 i,
1467                                                 mc->mc_conns[ i ].msc_ld,
1468                                                 ( candidates[ i ].sr_msgid == META_MSGID_NEED_BIND ) ?  " needbind" : "",
1469                                                 META_IS_BINDING( &candidates[ i ] ) ? " binding" : "" );
1470                                         Debug( LDAP_DEBUG_TRACE, "###    %s\n", buf, 0, 0 );
1471                                 }
1472                         }
1473 #endif
1474
1475                         if ( alreadybound == 0 ) {
1476 #if 0
1477                                 Debug( LDAP_DEBUG_TRACE, "### %s select(%ld.%06ld)\n",
1478                                         op->o_log_prefix, save_tv.tv_sec, save_tv.tv_usec );
1479 #endif
1480                                 tv = save_tv;
1481                                 (void)select( 0, NULL, NULL, NULL, &tv );
1482
1483                         } else {
1484                                 ldap_pvt_thread_yield();
1485                         }
1486                 }
1487         }
1488
1489         if ( rc == -1 ) {
1490                 /*
1491                  * FIXME: need a better strategy to handle errors
1492                  */
1493                 if ( mc ) {
1494                         rc = meta_back_op_result( mc, op, rs, META_TARGET_NONE,
1495                                 -1, stoptime != -1 ? (stoptime - slap_get_time()) : 0,
1496                                 LDAP_BACK_SENDERR );
1497                 } else {
1498                         rc = rs->sr_err;
1499                 }
1500                 goto finish;
1501         }
1502
1503         /*
1504          * Rewrite the matched portion of the search base, if required
1505          *
1506          * FIXME: only the last one gets caught!
1507          */
1508         savepriv = op->o_private;
1509         op->o_private = (void *)(long)mi->mi_ntargets;
1510         if ( candidate_match > 0 ) {
1511                 struct berval   pmatched = BER_BVNULL;
1512
1513                 /* we use the first one */
1514                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1515                         if ( META_IS_CANDIDATE( &candidates[ i ] )
1516                                         && candidates[ i ].sr_matched != NULL )
1517                         {
1518                                 struct berval   bv, pbv;
1519                                 int             rc;
1520
1521                                 /* if we got success, and this target
1522                                  * returned noSuchObject, and its suffix
1523                                  * is a superior of the searchBase,
1524                                  * ignore the matchedDN */
1525                                 if ( sres == LDAP_SUCCESS
1526                                         && candidates[ i ].sr_err == LDAP_NO_SUCH_OBJECT
1527                                         && op->o_req_ndn.bv_len > mi->mi_targets[ i ]->mt_nsuffix.bv_len )
1528                                 {
1529                                         free( (char *)candidates[ i ].sr_matched );
1530                                         candidates[ i ].sr_matched = NULL;
1531                                         continue;
1532                                 }
1533
1534                                 ber_str2bv( candidates[ i ].sr_matched, 0, 0, &bv );
1535                                 rc = dnPretty( NULL, &bv, &pbv, op->o_tmpmemctx );
1536
1537                                 if ( rc == LDAP_SUCCESS ) {
1538
1539                                         /* NOTE: if they all are superiors
1540                                          * of the baseDN, the shorter is also
1541                                          * superior of the longer... */
1542                                         if ( pbv.bv_len > pmatched.bv_len ) {
1543                                                 if ( !BER_BVISNULL( &pmatched ) ) {
1544                                                         op->o_tmpfree( pmatched.bv_val, op->o_tmpmemctx );
1545                                                 }
1546                                                 pmatched = pbv;
1547                                                 op->o_private = (void *)i;
1548
1549                                         } else {
1550                                                 op->o_tmpfree( pbv.bv_val, op->o_tmpmemctx );
1551                                         }
1552                                 }
1553
1554                                 if ( candidates[ i ].sr_matched != NULL ) {
1555                                         free( (char *)candidates[ i ].sr_matched );
1556                                         candidates[ i ].sr_matched = NULL;
1557                                 }
1558                         }
1559                 }
1560
1561                 if ( !BER_BVISNULL( &pmatched ) ) {
1562                         matched = pmatched.bv_val;
1563                 }
1564
1565         } else if ( sres == LDAP_NO_SUCH_OBJECT ) {
1566                 matched = op->o_bd->be_suffix[ 0 ].bv_val;
1567         }
1568
1569 #if 0
1570         {
1571                 char    buf[ SLAP_TEXT_BUFLEN ];
1572                 char    cnd[ SLAP_TEXT_BUFLEN ];
1573                 int     i;
1574
1575                 for ( i = 0; i < mi->mi_ntargets; i++ ) {
1576                         if ( META_IS_CANDIDATE( &candidates[ i ] ) ) {
1577                                 cnd[ i ] = '*';
1578                         } else {
1579                                 cnd[ i ] = ' ';
1580                         }
1581                 }
1582                 cnd[ i ] = '\0';
1583
1584                 snprintf( buf, sizeof( buf ), "%s meta_back_search: is_scope=%d is_ok=%d cnd=\"%s\"\n",
1585                         op->o_log_prefix, initial_candidates, is_ok, cnd );
1586
1587                 Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
1588         }
1589 #endif
1590
1591         /*
1592          * In case we returned at least one entry, we return LDAP_SUCCESS
1593          * otherwise, the latter error code we got
1594          */
1595
1596         if ( sres == LDAP_SUCCESS ) {
1597                 if ( rs->sr_v2ref ) {
1598                         sres = LDAP_REFERRAL;
1599                 }
1600
1601                 if ( META_BACK_ONERR_REPORT( mi ) ) {
1602                         /*
1603                          * Report errors, if any
1604                          *
1605                          * FIXME: we should handle error codes and return the more
1606                          * important/reasonable
1607                          */
1608                         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1609                                 if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
1610                                         continue;
1611                                 }
1612
1613                                 if ( candidates[ i ].sr_err != LDAP_SUCCESS
1614                                         && candidates[ i ].sr_err != LDAP_NO_SUCH_OBJECT )
1615                                 {
1616                                         sres = candidates[ i ].sr_err;
1617                                         break;
1618                                 }
1619                         }
1620                 }
1621         }
1622
1623         rs->sr_err = sres;
1624         rs->sr_matched = matched;
1625         rs->sr_ref = ( sres == LDAP_REFERRAL ? rs->sr_v2ref : NULL );
1626         send_ldap_result( op, rs );
1627         op->o_private = savepriv;
1628         rs->sr_matched = NULL;
1629         rs->sr_ref = NULL;
1630
1631 finish:;
1632         if ( matched && matched != op->o_bd->be_suffix[ 0 ].bv_val ) {
1633                 op->o_tmpfree( matched, op->o_tmpmemctx );
1634         }
1635
1636         if ( rs->sr_v2ref ) {
1637                 ber_bvarray_free( rs->sr_v2ref );
1638         }
1639
1640         for ( i = 0; i < mi->mi_ntargets; i++ ) {
1641                 if ( !META_IS_CANDIDATE( &candidates[ i ] ) ) {
1642                         continue;
1643                 }
1644
1645                 if ( mc && META_IS_BINDING( &candidates[ i ] ) ) {
1646                         ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex );
1647                         if ( LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ) {
1648                                 assert( candidates[ i ].sr_msgid >= 0 );
1649                                 assert( mc->mc_conns[ i ].msc_ld != NULL );
1650
1651 #ifdef DEBUG_205
1652                                 Debug( LDAP_DEBUG_ANY, "### %s meta_back_search(cleanup) "
1653                                         "ldap_unbind_ext[%ld] ld=%p\n",
1654                                         op->o_log_prefix, i, (void *)mc->mc_conns[i].msc_ld );
1655 #endif /* DEBUG_205 */
1656
1657                                 /* if still binding, destroy */
1658                                 meta_clear_one_candidate( op, mc, i );
1659                         }
1660                         ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex );
1661                         META_BINDING_CLEAR( &candidates[ i ] );
1662                 }
1663
1664                 if ( candidates[ i ].sr_matched ) {
1665                         free( (char *)candidates[ i ].sr_matched );
1666                         candidates[ i ].sr_matched = NULL;
1667                 }
1668
1669                 if ( candidates[ i ].sr_text ) {
1670                         ldap_memfree( (char *)candidates[ i ].sr_text );
1671                         candidates[ i ].sr_text = NULL;
1672                 }
1673
1674                 if ( candidates[ i ].sr_ref ) {
1675                         ber_bvarray_free( candidates[ i ].sr_ref );
1676                         candidates[ i ].sr_ref = NULL;
1677                 }
1678
1679                 if ( candidates[ i ].sr_ctrls ) {
1680                         ldap_controls_free( candidates[ i ].sr_ctrls );
1681                         candidates[ i ].sr_ctrls = NULL;
1682                 }
1683
1684                 if ( META_BACK_TGT_QUARANTINE( mi->mi_targets[ i ] ) ) {
1685                         meta_back_quarantine( op, &candidates[ i ], i );
1686                 }
1687
1688                 /* only in case of timelimit exceeded, if the timelimit exceeded because
1689                  * one contacted target never responded, invalidate the connection
1690                  * NOTE: should we quarantine the target as well?  right now, the connection
1691                  * is invalidated; the next time it will be recreated and the target
1692                  * will be quarantined if it cannot be contacted */
1693                 if ( mi->mi_idle_timeout != 0
1694                         && rs->sr_err == LDAP_TIMELIMIT_EXCEEDED
1695                         && op->o_time > mc->mc_conns[ i ].msc_time )
1696                 {
1697                         /* don't let anyone else use this expired connection */
1698                         LDAP_BACK_CONN_TAINTED_SET( mc );
1699                 }
1700         }
1701
1702         if ( mc ) {
1703                 meta_back_release_conn( op, mc );
1704         }
1705
1706         return rs->sr_err;
1707 }
1708
1709 static int
1710 meta_send_entry(
1711         Operation       *op,
1712         SlapReply       *rs,
1713         metaconn_t      *mc,
1714         int             target,
1715         LDAPMessage     *e )
1716 {
1717         metainfo_t              *mi = ( metainfo_t * )op->o_bd->be_private;
1718         struct berval           a, mapped;
1719         Entry                   ent = { 0 };
1720         BerElement              ber = *e->lm_ber;
1721         Attribute               *attr, **attrp;
1722         struct berval           bdn,
1723                                 dn = BER_BVNULL;
1724         const char              *text;
1725         dncookie                dc;
1726         int                     rc;
1727
1728         if ( ber_scanf( &ber, "{m{", &bdn ) == LBER_ERROR ) {
1729                 return LDAP_DECODING_ERROR;
1730         }
1731
1732         /*
1733          * Rewrite the dn of the result, if needed
1734          */
1735         dc.target = mi->mi_targets[ target ];
1736         dc.conn = op->o_conn;
1737         dc.rs = rs;
1738         dc.ctx = "searchResult";
1739
1740         rs->sr_err = ldap_back_dn_massage( &dc, &bdn, &dn );
1741         if ( rs->sr_err != LDAP_SUCCESS) {
1742                 return rs->sr_err;
1743         }
1744
1745         /*
1746          * Note: this may fail if the target host(s) schema differs
1747          * from the one known to the meta, and a DN with unknown
1748          * attributes is returned.
1749          *
1750          * FIXME: should we log anything, or delegate to dnNormalize?
1751          */
1752         rc = dnPrettyNormal( NULL, &dn, &ent.e_name, &ent.e_nname,
1753                 op->o_tmpmemctx );
1754         if ( dn.bv_val != bdn.bv_val ) {
1755                 free( dn.bv_val );
1756         }
1757         BER_BVZERO( &dn );
1758
1759         if ( rc != LDAP_SUCCESS ) {
1760                 return LDAP_INVALID_DN_SYNTAX;
1761         }
1762
1763         /*
1764          * cache dn
1765          */
1766         if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) {
1767                 ( void )meta_dncache_update_entry( &mi->mi_cache,
1768                                 &ent.e_nname, target );
1769         }
1770
1771         attrp = &ent.e_attrs;
1772
1773         dc.ctx = "searchAttrDN";
1774         while ( ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
1775                 int                             last = 0;
1776                 slap_syntax_validate_func       *validate;
1777                 slap_syntax_transform_func      *pretty;
1778
1779                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_at,
1780                                 &a, &mapped, BACKLDAP_REMAP );
1781                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0' ) {
1782                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1783                         continue;
1784                 }
1785                 attr = attr_alloc( NULL );
1786                 if ( attr == NULL ) {
1787                         continue;
1788                 }
1789                 if ( slap_bv2ad( &mapped, &attr->a_desc, &text )
1790                                 != LDAP_SUCCESS) {
1791                         if ( slap_bv2undef_ad( &mapped, &attr->a_desc, &text,
1792                                 SLAP_AD_PROXIED ) != LDAP_SUCCESS )
1793                         {
1794                                 char    buf[ SLAP_TEXT_BUFLEN ];
1795
1796                                 snprintf( buf, sizeof( buf ),
1797                                         "%s meta_send_entry(\"%s\"): "
1798                                         "slap_bv2undef_ad(%s): %s\n",
1799                                         op->o_log_prefix, ent.e_name.bv_val,
1800                                         mapped.bv_val, text );
1801
1802                                 Debug( LDAP_DEBUG_ANY, "%s", buf, 0, 0 );
1803                                 attr_free( attr );
1804                                 continue;
1805                         }
1806                 }
1807
1808                 /* no subschemaSubentry */
1809                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
1810                         || attr->a_desc == slap_schema.si_ad_entryDN )
1811                 {
1812
1813                         /*
1814                          * We eat target's subschemaSubentry because
1815                          * a search for this value is likely not
1816                          * to resolve to the appropriate backend;
1817                          * later, the local subschemaSubentry is
1818                          * added.
1819                          *
1820                          * We also eat entryDN because the frontend
1821                          * will reattach it without checking if already
1822                          * present...
1823                          */
1824                         ( void )ber_scanf( &ber, "x" /* [W] */ );
1825
1826                         attr_free(attr);
1827                         continue;
1828                 }
1829
1830                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
1831                                 || attr->a_vals == NULL )
1832                 {
1833                         attr->a_vals = (struct berval *)&slap_dummy_bv;
1834
1835                 } else {
1836                         for ( last = 0; !BER_BVISNULL( &attr->a_vals[ last ] ); ++last )
1837                                 ;
1838                 }
1839
1840                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
1841                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
1842
1843                 if ( !validate && !pretty ) {
1844                         attr_free( attr );
1845                         goto next_attr;
1846                 }
1847
1848                 if ( attr->a_desc == slap_schema.si_ad_objectClass
1849                                 || attr->a_desc == slap_schema.si_ad_structuralObjectClass )
1850                 {
1851                         struct berval   *bv;
1852
1853                         for ( bv = attr->a_vals; !BER_BVISNULL( bv ); bv++ ) {
1854                                 ldap_back_map( &mi->mi_targets[ target ]->mt_rwmap.rwm_oc,
1855                                                 bv, &mapped, BACKLDAP_REMAP );
1856                                 if ( BER_BVISNULL( &mapped ) || mapped.bv_val[0] == '\0') {
1857                                         free( bv->bv_val );
1858                                         BER_BVZERO( bv );
1859                                         if ( --last < 0 ) {
1860                                                 break;
1861                                         }
1862                                         *bv = attr->a_vals[ last ];
1863                                         BER_BVZERO( &attr->a_vals[ last ] );
1864                                         bv--;
1865
1866                                 } else if ( mapped.bv_val != bv->bv_val ) {
1867                                         free( bv->bv_val );
1868                                         ber_dupbv( bv, &mapped );
1869                                 }
1870                         }
1871                 /*
1872                  * It is necessary to try to rewrite attributes with
1873                  * dn syntax because they might be used in ACLs as
1874                  * members of groups; since ACLs are applied to the
1875                  * rewritten stuff, no dn-based subecj clause could
1876                  * be used at the ldap backend side (see
1877                  * http://www.OpenLDAP.org/faq/data/cache/452.html)
1878                  * The problem can be overcome by moving the dn-based
1879                  * ACLs to the target directory server, and letting
1880                  * everything pass thru the ldap backend.
1881                  */
1882                 } else {
1883                         int     i;
1884
1885                         if ( attr->a_desc->ad_type->sat_syntax ==
1886                                 slap_schema.si_syn_distinguishedName )
1887                         {
1888                                 ldap_dnattr_result_rewrite( &dc, attr->a_vals );
1889
1890                         } else if ( attr->a_desc == slap_schema.si_ad_ref ) {
1891                                 ldap_back_referral_result_rewrite( &dc, attr->a_vals );
1892
1893                         }
1894
1895                         for ( i = 0; i < last; i++ ) {
1896                                 struct berval   pval;
1897                                 int             rc;
1898
1899                                 if ( pretty ) {
1900                                         rc = pretty( attr->a_desc->ad_type->sat_syntax,
1901                                                 &attr->a_vals[i], &pval, NULL );
1902
1903                                 } else {
1904                                         rc = validate( attr->a_desc->ad_type->sat_syntax,
1905                                                 &attr->a_vals[i] );
1906                                 }
1907
1908                                 if ( rc ) {
1909                                         LBER_FREE( attr->a_vals[i].bv_val );
1910                                         if ( --last == i ) {
1911                                                 BER_BVZERO( &attr->a_vals[ i ] );
1912                                                 break;
1913                                         }
1914                                         attr->a_vals[i] = attr->a_vals[last];
1915                                         BER_BVZERO( &attr->a_vals[last] );
1916                                         i--;
1917                                         continue;
1918                                 }
1919
1920                                 if ( pretty ) {
1921                                         LBER_FREE( attr->a_vals[i].bv_val );
1922                                         attr->a_vals[i] = pval;
1923                                 }
1924                         }
1925
1926                         if ( last == 0 && attr->a_vals != &slap_dummy_bv ) {
1927                                 attr_free( attr );
1928                                 goto next_attr;
1929                         }
1930                 }
1931
1932                 if ( last && attr->a_desc->ad_type->sat_equality &&
1933                         attr->a_desc->ad_type->sat_equality->smr_normalize )
1934                 {
1935                         int i;
1936
1937                         attr->a_nvals = ch_malloc( ( last + 1 ) * sizeof( struct berval ) );
1938                         for ( i = 0; i<last; i++ ) {
1939                                 attr->a_desc->ad_type->sat_equality->smr_normalize(
1940                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
1941                                         attr->a_desc->ad_type->sat_syntax,
1942                                         attr->a_desc->ad_type->sat_equality,
1943                                         &attr->a_vals[i], &attr->a_nvals[i],
1944                                         NULL );
1945                         }
1946                         BER_BVZERO( &attr->a_nvals[i] );
1947
1948                 } else {
1949                         attr->a_nvals = attr->a_vals;
1950                 }
1951
1952                 *attrp = attr;
1953                 attrp = &attr->a_next;
1954 next_attr:;
1955         }
1956         rs->sr_entry = &ent;
1957         rs->sr_attrs = op->ors_attrs;
1958         rs->sr_flags = 0;
1959         rs->sr_err = LDAP_SUCCESS;
1960         rc = send_search_entry( op, rs );
1961         switch ( rc ) {
1962         case LDAP_UNAVAILABLE:
1963                 rc = LDAP_OTHER;
1964                 break;
1965         }
1966         rs->sr_entry = NULL;
1967         rs->sr_attrs = NULL;
1968
1969         if ( !BER_BVISNULL( &ent.e_name ) ) {
1970                 free( ent.e_name.bv_val );
1971                 BER_BVZERO( &ent.e_name );
1972         }
1973         if ( !BER_BVISNULL( &ent.e_nname ) ) {
1974                 free( ent.e_nname.bv_val );
1975                 BER_BVZERO( &ent.e_nname );
1976         }
1977         entry_clean( &ent );
1978
1979         return rc;
1980 }
1981