git.sur5r.net Git - openldap/blob - servers/slapd/backglue.c

   1 /* backglue.c - backend glue */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2001-2006 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 /*
  18  * Functions to glue a bunch of other backends into a single tree.
  19  * All of the glued backends must share a common suffix. E.g., you
  20  * can glue o=foo and ou=bar,o=foo but you can't glue o=foo and o=bar.
  21  *
  22  * The purpose of these functions is to allow you to split a single database
  23  * into pieces (for load balancing purposes, whatever) but still be able
  24  * to treat it as a single database after it's been split. As such, each
  25  * of the glued backends should have identical rootdn.
  26  *  -- Howard Chu
  27  */
  28
  29 #include "portable.h"
  30
  31 #include <stdio.h>
  32
  33 #include <ac/string.h>
  34 #include <ac/socket.h>
  35
  36 #define SLAPD_TOOLS
  37 #include "slap.h"
  38
  39 typedef struct gluenode {
  40         BackendDB *gn_be;
  41         struct berval gn_pdn;
  42 } gluenode;
  43
  44 typedef struct glueinfo {
  45         int gi_nodes;
  46         struct berval gi_pdn;
  47         gluenode gi_n[1];
  48 } glueinfo;
  49
  50 static slap_overinst    glue;
  51
  52 static int glueMode;
  53 static BackendDB *glueBack;
  54
  55 static slap_response glue_op_response;
  56
  57 /* Just like select_backend, but only for our backends */
  58 static BackendDB *
  59 glue_back_select (
  60         BackendDB *be,
  61         struct berval *dn
  62 )
  63 {
  64         slap_overinst   *on = (slap_overinst *)be->bd_info;
  65         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
  66         int i;
  67
  68         for (i = 0; i<gi->gi_nodes; i++) {
  69                 assert( gi->gi_n[i].gn_be->be_nsuffix != NULL );
  70
  71                 if (dnIsSuffix(dn, &gi->gi_n[i].gn_be->be_nsuffix[0])) {
  72                         return gi->gi_n[i].gn_be;
  73                 }
  74         }
  75         be->bd_info = on->on_info->oi_orig;
  76         return be;
  77 }
  78
  79
  80 typedef struct glue_state {
  81         int err;
  82         int matchlen;
  83         char *matched;
  84         int nrefs;
  85         BerVarray refs;
  86 } glue_state;
  87
  88 static int
  89 glue_op_response ( Operation *op, SlapReply *rs )
  90 {
  91         glue_state *gs = op->o_callback->sc_private;
  92
  93         switch(rs->sr_type) {
  94         case REP_SEARCH:
  95         case REP_SEARCHREF:
  96         case REP_INTERMEDIATE:
  97                 return SLAP_CB_CONTINUE;
  98
  99         default:
 100                 if (rs->sr_err == LDAP_SUCCESS ||
 101                         rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ||
 102                         rs->sr_err == LDAP_TIMELIMIT_EXCEEDED ||
 103                         rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 104                         rs->sr_err == LDAP_NO_SUCH_OBJECT ||
 105                         gs->err != LDAP_SUCCESS)
 106                         gs->err = rs->sr_err;
 107                 if (gs->err == LDAP_SUCCESS && gs->matched) {
 108                         ch_free (gs->matched);
 109                         gs->matched = NULL;
 110                         gs->matchlen = 0;
 111                 }
 112                 if (gs->err != LDAP_SUCCESS && rs->sr_matched) {
 113                         int len;
 114                         len = strlen (rs->sr_matched);
 115                         if (len > gs->matchlen) {
 116                                 if (gs->matched)
 117                                         ch_free (gs->matched);
 118                                 gs->matched = ch_strdup (rs->sr_matched);
 119                                 gs->matchlen = len;
 120                         }
 121                 }
 122                 if (rs->sr_ref) {
 123                         int i, j, k;
 124                         BerVarray new;
 125
 126                         for (i=0; rs->sr_ref[i].bv_val; i++);
 127
 128                         j = gs->nrefs;
 129                         if (!j) {
 130                                 new = ch_malloc ((i+1)*sizeof(struct berval));
 131                         } else {
 132                                 new = ch_realloc(gs->refs,
 133                                         (j+i+1)*sizeof(struct berval));
 134                         }
 135                         for (k=0; k<i; j++,k++) {
 136                                 ber_dupbv( &new[j], &rs->sr_ref[k] );
 137                         }
 138                         new[j].bv_val = NULL;
 139                         gs->nrefs = j;
 140                         gs->refs = new;
 141                 }
 142         }
 143         return 0;
 144 }
 145
 146 static int
 147 glue_op_func ( Operation *op, SlapReply *rs )
 148 {
 149         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 150         BackendDB *b0 = op->o_bd;
 151         BackendInfo *bi0 = op->o_bd->bd_info;
 152         BI_op_modify **func;
 153         slap_operation_t which = op_bind;
 154         int rc;
 155
 156         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 157
 158         /* If we're on the master backend, let overlay framework handle it */
 159         if ( op->o_bd == b0 )
 160                 return SLAP_CB_CONTINUE;
 161
 162         b0->bd_info = on->on_info->oi_orig;
 163
 164         switch(op->o_tag) {
 165         case LDAP_REQ_ADD: which = op_add; break;
 166         case LDAP_REQ_DELETE: which = op_delete; break;
 167         case LDAP_REQ_MODIFY: which = op_modify; break;
 168         case LDAP_REQ_MODRDN: which = op_modrdn; break;
 169         default: assert( 0 ); break;
 170         }
 171
 172         func = &op->o_bd->bd_info->bi_op_bind;
 173         if ( func[which] )
 174                 rc = func[which]( op, rs );
 175         else
 176                 rc = SLAP_CB_CONTINUE;
 177
 178         op->o_bd = b0;
 179         op->o_bd->bd_info = bi0;
 180         return rc;
 181 }
 182
 183 static int
 184 glue_chk_referrals ( Operation *op, SlapReply *rs )
 185 {
 186         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 187         BackendDB *b0 = op->o_bd;
 188         BackendInfo *bi0 = op->o_bd->bd_info;
 189         int rc;
 190
 191         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 192         if ( op->o_bd == b0 )
 193                 return SLAP_CB_CONTINUE;
 194
 195         b0->bd_info = on->on_info->oi_orig;
 196
 197         if ( op->o_bd->bd_info->bi_chk_referrals )
 198                 rc = ( *op->o_bd->bd_info->bi_chk_referrals )( op, rs );
 199         else
 200                 rc = SLAP_CB_CONTINUE;
 201
 202         op->o_bd = b0;
 203         op->o_bd->bd_info = bi0;
 204         return rc;
 205 }
 206
 207 static int
 208 glue_chk_controls ( Operation *op, SlapReply *rs )
 209 {
 210         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 211         BackendDB *b0 = op->o_bd;
 212         BackendInfo *bi0 = op->o_bd->bd_info;
 213         int rc = SLAP_CB_CONTINUE;
 214
 215         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 216         if ( op->o_bd == b0 )
 217                 return SLAP_CB_CONTINUE;
 218
 219         b0->bd_info = on->on_info->oi_orig;
 220
 221         /* if the subordinate database has overlays, the bi_chk_controls()
 222          * hook is actually over_aux_chk_controls(); in case it actually
 223          * wraps a missing hok, we need to mimic the behavior
 224          * of the frontend applied to that database */
 225         if ( op->o_bd->bd_info->bi_chk_controls ) {
 226                 rc = ( *op->o_bd->bd_info->bi_chk_controls )( op, rs );
 227         }
 228
 229
 230         if ( rc == SLAP_CB_CONTINUE ) {
 231                 rc = backend_check_controls( op, rs );
 232         }
 233
 234         op->o_bd = b0;
 235         op->o_bd->bd_info = bi0;
 236         return rc;
 237 }
 238
 239 static int
 240 glue_sub_search( Operation *op, SlapReply *rs, BackendDB *b0,
 241         slap_overinst *on )
 242 {
 243         /* Process any overlays on the master backend */
 244         if ( op->o_bd == b0 && on->on_next ) {
 245                 BackendInfo *bi = op->o_bd->bd_info;
 246                 int rc;
 247                 for ( on=on->on_next; on; on=on->on_next ) {
 248                         op->o_bd->bd_info = (BackendInfo *)on;
 249                         rc = on->on_bi.bi_op_search( op, rs );
 250                         if ( rc != SLAP_CB_CONTINUE )
 251                                 break;
 252                 }
 253                 op->o_bd->bd_info = bi;
 254                 if ( rc != SLAP_CB_CONTINUE )
 255                         return rc;
 256         }
 257         return op->o_bd->be_search( op, rs );
 258 }
 259
 260 static int
 261 glue_op_search ( Operation *op, SlapReply *rs )
 262 {
 263         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 264         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 265         BackendDB *b0 = op->o_bd;
 266         BackendDB *b1 = NULL, *btmp;
 267         BackendInfo *bi0 = op->o_bd->bd_info;
 268         int i;
 269         long stoptime = 0;
 270         glue_state gs = {0, 0, NULL, 0, NULL};
 271         slap_callback cb = { NULL, glue_op_response, NULL, NULL };
 272         int scope0, tlimit0;
 273         struct berval dn, ndn, *pdn;
 274
 275         cb.sc_private = &gs;
 276
 277         cb.sc_next = op->o_callback;
 278
 279         stoptime = slap_get_time () + op->ors_tlimit;
 280
 281         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 282         b0->bd_info = on->on_info->oi_orig;
 283
 284         switch (op->ors_scope) {
 285         case LDAP_SCOPE_BASE:
 286                 if ( op->o_bd == b0 )
 287                         return SLAP_CB_CONTINUE;
 288
 289                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 290                 if (op->o_bd && op->o_bd->be_search) {
 291                         rs->sr_err = op->o_bd->be_search( op, rs );
 292                 }
 293                 return rs->sr_err;
 294
 295         case LDAP_SCOPE_ONELEVEL:
 296         case LDAP_SCOPE_SUBTREE:
 297         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 298                 op->o_callback = &cb;
 299                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 300                 scope0 = op->ors_scope;
 301                 tlimit0 = op->ors_tlimit;
 302                 dn = op->o_req_dn;
 303                 ndn = op->o_req_ndn;
 304                 b1 = op->o_bd;
 305
 306                 /*
 307                  * Execute in reverse order, most general first
 308                  */
 309                 for (i = gi->gi_nodes; i >= 0; i--) {
 310                         if ( i == gi->gi_nodes ) {
 311                                 btmp = b0;
 312                                 pdn = &gi->gi_pdn;
 313                         } else {
 314                                 btmp = gi->gi_n[i].gn_be;
 315                                 pdn = &gi->gi_n[i].gn_pdn;
 316                         }
 317                         if (!btmp || !btmp->be_search)
 318                                 continue;
 319                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 320                                 continue;
 321                         if (tlimit0 != SLAP_NO_LIMIT) {
 322                                 op->ors_tlimit = stoptime - slap_get_time ();
 323                                 if (op->ors_tlimit <= 0) {
 324                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 325                                         break;
 326                                 }
 327                         }
 328                         rs->sr_err = 0;
 329                         /*
 330                          * check for abandon
 331                          */
 332                         if (op->o_abandon) {
 333                                 goto end_of_loop;
 334                         }
 335                         op->o_bd = btmp;
 336
 337                         assert( op->o_bd->be_suffix != NULL );
 338                         assert( op->o_bd->be_nsuffix != NULL );
 339
 340                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 341                                 dn_match(pdn, &ndn))
 342                         {
 343                                 op->ors_scope = LDAP_SCOPE_BASE;
 344                                 op->o_req_dn = op->o_bd->be_suffix[0];
 345                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 346                                 rs->sr_err = op->o_bd->be_search(op, rs);
 347                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 348                                         gs.err = LDAP_SUCCESS;
 349                                 }
 350
 351                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 352                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 353                         {
 354                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 355
 356                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 357                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 358                         {
 359                                 op->o_req_dn = op->o_bd->be_suffix[0];
 360                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 361                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 362                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 363                                         gs.err = LDAP_SUCCESS;
 364                                 }
 365                                 op->o_req_dn = dn;
 366                                 op->o_req_ndn = ndn;
 367
 368                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 369                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 370                         }
 371
 372                         switch ( gs.err ) {
 373
 374                         /*
 375                          * Add errors that should result in dropping
 376                          * the search
 377                          */
 378                         case LDAP_SIZELIMIT_EXCEEDED:
 379                         case LDAP_TIMELIMIT_EXCEEDED:
 380                         case LDAP_ADMINLIMIT_EXCEEDED:
 381                         case LDAP_NO_SUCH_OBJECT:
 382 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 383                         case LDAP_X_CANNOT_CHAIN:
 384 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 385                                 goto end_of_loop;
 386
 387                         default:
 388                                 break;
 389                         }
 390                 }
 391 end_of_loop:;
 392                 op->ors_scope = scope0;
 393                 op->ors_tlimit = tlimit0;
 394                 op->o_req_dn = dn;
 395                 op->o_req_ndn = ndn;
 396
 397                 break;
 398         }
 399         if ( op->o_abandon ) {
 400                 rs->sr_err = SLAPD_ABANDON;
 401         } else {
 402                 op->o_callback = cb.sc_next;
 403                 rs->sr_err = gs.err;
 404                 rs->sr_matched = gs.matched;
 405                 rs->sr_ref = gs.refs;
 406
 407                 send_ldap_result( op, rs );
 408         }
 409
 410         op->o_bd = b0;
 411         op->o_bd->bd_info = bi0;
 412         if (gs.matched)
 413                 free (gs.matched);
 414         if (gs.refs)
 415                 ber_bvarray_free(gs.refs);
 416         return rs->sr_err;
 417 }
 418
 419 static BackendDB toolDB;
 420
 421 static int
 422 glue_tool_entry_open (
 423         BackendDB *b0,
 424         int mode
 425 )
 426 {
 427         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 428
 429         /* We don't know which backend to talk to yet, so just
 430          * remember the mode and move on...
 431          */
 432
 433         glueMode = mode;
 434         glueBack = NULL;
 435         toolDB = *b0;
 436         toolDB.bd_info = oi->oi_orig;
 437
 438         return 0;
 439 }
 440
 441 static int
 442 glue_tool_entry_close (
 443         BackendDB *b0
 444 )
 445 {
 446         int rc = 0;
 447
 448         if (glueBack) {
 449                 if (!glueBack->be_entry_close)
 450                         return 0;
 451                 rc = glueBack->be_entry_close (glueBack);
 452         }
 453         return rc;
 454 }
 455
 456 static slap_overinst *
 457 glue_tool_inst(
 458         BackendInfo *bi
 459 )
 460 {
 461         slap_overinfo   *oi = (slap_overinfo *)bi;
 462         slap_overinst   *on;
 463
 464         for ( on = oi->oi_list; on; on=on->on_next ) {
 465                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 466                         return on;
 467         }
 468         return NULL;
 469 }
 470
 471 /* This function will only be called in tool mode */
 472 static int
 473 glue_open (
 474         BackendInfo *bi
 475 )
 476 {
 477         slap_overinst *on = glue_tool_inst( bi );
 478         glueinfo                *gi = on->on_bi.bi_private;
 479         static int glueOpened = 0;
 480         int i, j, same, bsame = 0, rc = 0;
 481
 482         if (glueOpened) return 0;
 483
 484         glueOpened = 1;
 485
 486         /* If we were invoked in tool mode, open all the underlying backends */
 487         if (slapMode & SLAP_TOOL_MODE) {
 488                 for (i = 0; i<gi->gi_nodes; i++) {
 489                         same = 0;
 490                         /* Same bi_open as our main backend? */
 491                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 492                                 on->on_info->oi_orig->bi_open )
 493                                 bsame = 1;
 494
 495                         /* Loop thru the bd_info's and make sure we only
 496                          * invoke their bi_open functions once each.
 497                          */
 498                         for ( j = 0; j<i; j++ ) {
 499                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 500                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 501                                         same = 1;
 502                                         break;
 503                                 }
 504                         }
 505                         /* OK, it's unique and non-NULL, call it. */
 506                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 507                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 508                                         gi->gi_n[i].gn_be->bd_info );
 509                         /* Let backend.c take care of the rest of startup */
 510                         if ( !rc )
 511                                 rc = backend_startup_one( gi->gi_n[i].gn_be );
 512                         if ( rc ) break;
 513                 }
 514                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 515                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 516
 517         } /* other case is impossible */
 518         return rc;
 519 }
 520
 521 /* This function will only be called in tool mode */
 522 static int
 523 glue_close (
 524         BackendInfo *bi
 525 )
 526 {
 527         static int glueClosed = 0;
 528         int rc = 0;
 529
 530         if (glueClosed) return 0;
 531
 532         glueClosed = 1;
 533
 534         if (slapMode & SLAP_TOOL_MODE) {
 535                 rc = backend_shutdown( NULL );
 536         }
 537         return rc;
 538 }
 539
 540 static int
 541 glue_entry_release_rw (
 542         Operation *op,
 543         Entry *e,
 544         int rw
 545 )
 546 {
 547         BackendDB *b0, b2;
 548         int rc = -1;
 549
 550         b0 = op->o_bd;
 551         b2 = *op->o_bd;
 552         b2.bd_info = (BackendInfo *)glue_tool_inst( op->o_bd->bd_info );
 553         op->o_bd = glue_back_select (&b2, &e->e_nname);
 554
 555         if ( op->o_bd->be_release ) {
 556                 rc = op->o_bd->be_release( op, e, rw );
 557
 558         } else {
 559                 /* FIXME: mimic be_entry_release_rw
 560                  * when no be_release() available */
 561                 /* free entry */
 562                 entry_free( e );
 563                 rc = 0;
 564         }
 565         op->o_bd = b0;
 566         return rc;
 567 }
 568
 569 static ID
 570 glue_tool_entry_first (
 571         BackendDB *b0
 572 )
 573 {
 574         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 575         glueinfo                *gi = on->on_bi.bi_private;
 576         int i;
 577
 578         /* If we're starting from scratch, start at the most general */
 579         if (!glueBack) {
 580                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 581                         glueBack = &toolDB;
 582                 } else {
 583                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 584                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 585                                         gi->gi_n[i].gn_be->be_entry_first) {
 586                                                 glueBack = gi->gi_n[i].gn_be;
 587                                         break;
 588                                 }
 589                         }
 590                 }
 591         }
 592         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 593                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 594                 return NOID;
 595
 596         return glueBack->be_entry_first (glueBack);
 597 }
 598
 599 static ID
 600 glue_tool_entry_next (
 601         BackendDB *b0
 602 )
 603 {
 604         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 605         glueinfo                *gi = on->on_bi.bi_private;
 606         int i;
 607         ID rc;
 608
 609         if (!glueBack || !glueBack->be_entry_next)
 610                 return NOID;
 611
 612         rc = glueBack->be_entry_next (glueBack);
 613
 614         /* If we ran out of entries in one database, move on to the next */
 615         while (rc == NOID) {
 616                 if ( glueBack && glueBack->be_entry_close )
 617                         glueBack->be_entry_close (glueBack);
 618                 for (i=0; i<gi->gi_nodes; i++) {
 619                         if (gi->gi_n[i].gn_be == glueBack)
 620                                 break;
 621                 }
 622                 if (i == 0) {
 623                         glueBack = NULL;
 624                         break;
 625                 } else {
 626                         glueBack = gi->gi_n[i-1].gn_be;
 627                         rc = glue_tool_entry_first (b0);
 628                 }
 629         }
 630         return rc;
 631 }
 632
 633 static Entry *
 634 glue_tool_entry_get (
 635         BackendDB *b0,
 636         ID id
 637 )
 638 {
 639         if (!glueBack || !glueBack->be_entry_get)
 640                 return NULL;
 641
 642         return glueBack->be_entry_get (glueBack, id);
 643 }
 644
 645 static ID
 646 glue_tool_entry_put (
 647         BackendDB *b0,
 648         Entry *e,
 649         struct berval *text
 650 )
 651 {
 652         BackendDB *be, b2;
 653         int rc = -1;
 654
 655         b2 = *b0;
 656         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 657         be = glue_back_select (&b2, &e->e_nname);
 658         if ( be == &b2 ) be = &toolDB;
 659
 660         if (!be->be_entry_put)
 661                 return NOID;
 662
 663         if (!glueBack) {
 664                 if ( be->be_entry_open ) {
 665                         rc = be->be_entry_open (be, glueMode);
 666                 }
 667                 if (rc != 0) {
 668                         return NOID;
 669                 }
 670         } else if (be != glueBack) {
 671                 /* If this entry belongs in a different branch than the
 672                  * previous one, close the current database and open the
 673                  * new one.
 674                  */
 675                 if ( glueBack->be_entry_close ) {
 676                         glueBack->be_entry_close (glueBack);
 677                 }
 678                 if ( be->be_entry_open ) {
 679                         rc = be->be_entry_open (be, glueMode);
 680                 }
 681                 if (rc != 0) {
 682                         return NOID;
 683                 }
 684         }
 685         glueBack = be;
 686         return be->be_entry_put (be, e, text);
 687 }
 688
 689 static int
 690 glue_tool_entry_reindex (
 691         BackendDB *b0,
 692         ID id
 693 )
 694 {
 695         if (!glueBack || !glueBack->be_entry_reindex)
 696                 return -1;
 697
 698         return glueBack->be_entry_reindex (glueBack, id);
 699 }
 700
 701 static int
 702 glue_tool_sync (
 703         BackendDB *b0
 704 )
 705 {
 706         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 707         glueinfo                *gi = on->on_bi.bi_private;
 708         BackendInfo             *bi = b0->bd_info;
 709         int i;
 710
 711         /* just sync everyone */
 712         for (i = 0; i<gi->gi_nodes; i++)
 713                 if (gi->gi_n[i].gn_be->be_sync)
 714                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
 715         b0->bd_info = on->on_info->oi_orig;
 716         if ( b0->be_sync )
 717                 b0->be_sync( b0 );
 718         b0->bd_info = bi;
 719         return 0;
 720 }
 721
 722 static int
 723 glue_db_init(
 724         BackendDB *be
 725 )
 726 {
 727         slap_overinst   *on = (slap_overinst *)be->bd_info;
 728         slap_overinfo   *oi = on->on_info;
 729         BackendInfo     *bi = oi->oi_orig;
 730         glueinfo *gi;
 731
 732         gi = ch_calloc( 1, sizeof(glueinfo));
 733         on->on_bi.bi_private = gi;
 734         dnParent( be->be_nsuffix, &gi->gi_pdn );
 735
 736         /* Currently the overlay framework doesn't handle these entry points
 737          * but we need them....
 738          */
 739         oi->oi_bi.bi_open = glue_open;
 740         oi->oi_bi.bi_close = glue_close;
 741
 742         oi->oi_bi.bi_entry_release_rw = glue_entry_release_rw;
 743
 744         /* Only advertise these if the root DB supports them */
 745         if ( bi->bi_tool_entry_open )
 746                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
 747         if ( bi->bi_tool_entry_close )
 748                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
 749         if ( bi->bi_tool_entry_first )
 750                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
 751         if ( bi->bi_tool_entry_next )
 752                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
 753         if ( bi->bi_tool_entry_get )
 754                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
 755         if ( bi->bi_tool_entry_put )
 756                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
 757         if ( bi->bi_tool_entry_reindex )
 758                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
 759         if ( bi->bi_tool_sync )
 760                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
 761
 762         /*FIXME : need to add support */
 763         oi->oi_bi.bi_tool_dn2id_get = 0;
 764         oi->oi_bi.bi_tool_id2entry_get = 0;
 765         oi->oi_bi.bi_tool_entry_modify = 0;
 766
 767         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
 768
 769         return 0;
 770 }
 771
 772 static int
 773 glue_db_destroy (
 774         BackendDB *be
 775 )
 776 {
 777         slap_overinst   *on = (slap_overinst *)be->bd_info;
 778         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 779
 780         free (gi);
 781         return SLAP_CB_CONTINUE;
 782 }
 783
 784 static int
 785 glue_db_close(
 786         BackendDB *be
 787 )
 788 {
 789         slap_overinst   *on = (slap_overinst *)be->bd_info;
 790
 791         on->on_info->oi_bi.bi_db_close = 0;
 792         return 0;
 793 }
 794
 795 int
 796 glue_sub_del( BackendDB *b0 )
 797 {
 798         BackendDB *be;
 799         int rc = 0;
 800
 801         /* Find the top backend for this subordinate */
 802         be = b0;
 803         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 804                 slap_overinfo *oi;
 805                 slap_overinst *on;
 806                 glueinfo *gi;
 807                 int i;
 808
 809                 if ( SLAP_GLUE_SUBORDINATE( be ))
 810                         continue;
 811                 if ( !SLAP_GLUE_INSTANCE( be ))
 812                         continue;
 813                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
 814                         continue;
 815
 816                 /* OK, got the right backend, find the overlay */
 817                 oi = (slap_overinfo *)be->bd_info;
 818                 for ( on=oi->oi_list; on; on=on->on_next ) {
 819                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 820                                 break;
 821                 }
 822                 assert( on != NULL );
 823                 gi = on->on_bi.bi_private;
 824                 for ( i=0; i < gi->gi_nodes; i++ ) {
 825                         if ( gi->gi_n[i].gn_be == b0 ) {
 826                                 int j;
 827
 828                                 for (j=i+1; j < gi->gi_nodes; j++)
 829                                         gi->gi_n[j-1] = gi->gi_n[j];
 830
 831                                 gi->gi_nodes--;
 832                         }
 833                 }
 834         }
 835         if ( be == NULL )
 836                 rc = LDAP_NO_SUCH_OBJECT;
 837
 838         return rc;
 839 }
 840
 841 typedef struct glue_Addrec {
 842         struct glue_Addrec *ga_next;
 843         BackendDB *ga_be;
 844 } glue_Addrec;
 845
 846 /* List of added subordinates */
 847 static glue_Addrec *ga_list;
 848
 849 /* Attach all the subordinate backends to their superior */
 850 int
 851 glue_sub_attach()
 852 {
 853         glue_Addrec *ga, *gnext = NULL;
 854         int rc = 0;
 855
 856         /* For all the subordinate backends */
 857         for ( ga=ga_list; ga != NULL; ga = gnext ) {
 858                 BackendDB *be;
 859
 860                 gnext = ga->ga_next;
 861
 862                 /* Find the top backend for this subordinate */
 863                 be = ga->ga_be;
 864                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 865                         slap_overinfo *oi;
 866                         slap_overinst *on;
 867                         glueinfo *gi;
 868
 869                         if ( SLAP_GLUE_SUBORDINATE( be ))
 870                                 continue;
 871                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
 872                                 continue;
 873
 874                         /* If it's not already configured, set up the overlay */
 875                         if ( !SLAP_GLUE_INSTANCE( be )) {
 876                                 rc = overlay_config( be, glue.on_bi.bi_type );
 877                                 if ( rc )
 878                                         break;
 879                         }
 880                         /* Find the overlay instance */
 881                         oi = (slap_overinfo *)be->bd_info;
 882                         for ( on=oi->oi_list; on; on=on->on_next ) {
 883                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 884                                         break;
 885                         }
 886                         assert( on != NULL );
 887                         gi = on->on_bi.bi_private;
 888                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
 889                                 gi->gi_nodes * sizeof(gluenode));
 890                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
 891                         dnParent( &ga->ga_be->be_nsuffix[0],
 892                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
 893                         gi->gi_nodes++;
 894                         on->on_bi.bi_private = gi;
 895                         break;
 896                 }
 897                 if ( !be ) {
 898                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
 899                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
 900                         rc = LDAP_NO_SUCH_OBJECT;
 901                 }
 902                 ch_free( ga );
 903                 if ( rc ) break;
 904         }
 905
 906         ga_list = gnext;
 907
 908         return rc;
 909 }
 910
 911 int
 912 glue_sub_add( BackendDB *be, int advert, int online )
 913 {
 914         glue_Addrec *ga;
 915         int rc = 0;
 916
 917         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
 918         if ( advert )
 919                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
 920
 921         ga = ch_malloc( sizeof( glue_Addrec ));
 922         ga->ga_next = ga_list;
 923         ga->ga_be = be;
 924         ga_list = ga;
 925
 926         if ( online )
 927                 rc = glue_sub_attach();
 928
 929         return rc;
 930 }
 931
 932 int
 933 glue_sub_init()
 934 {
 935         glue.on_bi.bi_type = "glue";
 936
 937         glue.on_bi.bi_db_init = glue_db_init;
 938         glue.on_bi.bi_db_close = glue_db_close;
 939         glue.on_bi.bi_db_destroy = glue_db_destroy;
 940
 941         glue.on_bi.bi_op_search = glue_op_search;
 942         glue.on_bi.bi_op_modify = glue_op_func;
 943         glue.on_bi.bi_op_modrdn = glue_op_func;
 944         glue.on_bi.bi_op_add = glue_op_func;
 945         glue.on_bi.bi_op_delete = glue_op_func;
 946
 947         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
 948         glue.on_bi.bi_chk_controls = glue_chk_controls;
 949
 950         return overlay_register( &glue );
 951 }