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 = gi->gi_nodes-1; i >= 0; 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         char *matched;
  82         BerVarray refs;
  83         LDAPControl **ctrls;
  84         int err;
  85         int matchlen;
  86         int nrefs;
  87         int nctrls;
  88 } glue_state;
  89
  90 static int
  91 glue_op_response ( Operation *op, SlapReply *rs )
  92 {
  93         glue_state *gs = op->o_callback->sc_private;
  94
  95         switch(rs->sr_type) {
  96         case REP_SEARCH:
  97         case REP_SEARCHREF:
  98         case REP_INTERMEDIATE:
  99                 return SLAP_CB_CONTINUE;
 100
 101         default:
 102                 if (rs->sr_err == LDAP_SUCCESS ||
 103                         rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ||
 104                         rs->sr_err == LDAP_TIMELIMIT_EXCEEDED ||
 105                         rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 106                         rs->sr_err == LDAP_NO_SUCH_OBJECT ||
 107                         gs->err != LDAP_SUCCESS)
 108                         gs->err = rs->sr_err;
 109                 if (gs->err == LDAP_SUCCESS && gs->matched) {
 110                         ch_free (gs->matched);
 111                         gs->matched = NULL;
 112                         gs->matchlen = 0;
 113                 }
 114                 if (gs->err != LDAP_SUCCESS && rs->sr_matched) {
 115                         int len;
 116                         len = strlen (rs->sr_matched);
 117                         if (len > gs->matchlen) {
 118                                 if (gs->matched)
 119                                         ch_free (gs->matched);
 120                                 gs->matched = ch_strdup (rs->sr_matched);
 121                                 gs->matchlen = len;
 122                         }
 123                 }
 124                 if (rs->sr_ref) {
 125                         int i, j, k;
 126                         BerVarray new;
 127
 128                         for (i=0; rs->sr_ref[i].bv_val; i++);
 129
 130                         j = gs->nrefs;
 131                         if (!j) {
 132                                 new = ch_malloc ((i+1)*sizeof(struct berval));
 133                         } else {
 134                                 new = ch_realloc(gs->refs,
 135                                         (j+i+1)*sizeof(struct berval));
 136                         }
 137                         for (k=0; k<i; j++,k++) {
 138                                 ber_dupbv( &new[j], &rs->sr_ref[k] );
 139                         }
 140                         new[j].bv_val = NULL;
 141                         gs->nrefs = j;
 142                         gs->refs = new;
 143                 }
 144                 if (rs->sr_ctrls) {
 145                         int i, j, k;
 146                         LDAPControl **newctrls;
 147
 148                         for (i=0; rs->sr_ctrls[i]; i++);
 149
 150                         j = gs->nctrls;
 151                         if (!j) {
 152                                 newctrls = ch_malloc((i+1)*sizeof(LDAPControl *));
 153                         } else {
 154                                 newctrls = ch_realloc(gs->ctrls,
 155                                         (j+i+1)*sizeof(LDAPControl *));
 156                         }
 157                         for (k=0; k<i; j++,k++) {
 158                                 newctrls[j] = ch_malloc(sizeof(LDAPControl));
 159                                 *newctrls[j] = *rs->sr_ctrls[k];
 160                                 if ( !BER_BVISNULL( &rs->sr_ctrls[k]->ldctl_value ))
 161                                         ber_dupbv( &newctrls[j]->ldctl_value,
 162                                                 &rs->sr_ctrls[k]->ldctl_value );
 163                         }
 164                         newctrls[j] = NULL;
 165                         gs->nctrls = j;
 166                         gs->ctrls = newctrls;
 167                 }
 168         }
 169         return 0;
 170 }
 171
 172 static int
 173 glue_op_func ( Operation *op, SlapReply *rs )
 174 {
 175         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 176         BackendDB *b0 = op->o_bd;
 177         BackendInfo *bi0 = op->o_bd->bd_info;
 178         BI_op_modify **func;
 179         slap_operation_t which = op_bind;
 180         int rc;
 181
 182         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 183
 184         /* If we're on the master backend, let overlay framework handle it */
 185         if ( op->o_bd == b0 )
 186                 return SLAP_CB_CONTINUE;
 187
 188         b0->bd_info = on->on_info->oi_orig;
 189
 190         switch(op->o_tag) {
 191         case LDAP_REQ_ADD: which = op_add; break;
 192         case LDAP_REQ_DELETE: which = op_delete; break;
 193         case LDAP_REQ_MODIFY: which = op_modify; break;
 194         case LDAP_REQ_MODRDN: which = op_modrdn; break;
 195         default: assert( 0 ); break;
 196         }
 197
 198         func = &op->o_bd->bd_info->bi_op_bind;
 199         if ( func[which] )
 200                 rc = func[which]( op, rs );
 201         else
 202                 rc = SLAP_CB_CONTINUE;
 203
 204         op->o_bd = b0;
 205         op->o_bd->bd_info = bi0;
 206         return rc;
 207 }
 208
 209 static int
 210 glue_chk_referrals ( Operation *op, SlapReply *rs )
 211 {
 212         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 213         BackendDB *b0 = op->o_bd;
 214         BackendInfo *bi0 = op->o_bd->bd_info;
 215         int rc;
 216
 217         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 218         if ( op->o_bd == b0 )
 219                 return SLAP_CB_CONTINUE;
 220
 221         b0->bd_info = on->on_info->oi_orig;
 222
 223         if ( op->o_bd->bd_info->bi_chk_referrals )
 224                 rc = ( *op->o_bd->bd_info->bi_chk_referrals )( op, rs );
 225         else
 226                 rc = SLAP_CB_CONTINUE;
 227
 228         op->o_bd = b0;
 229         op->o_bd->bd_info = bi0;
 230         return rc;
 231 }
 232
 233 static int
 234 glue_chk_controls ( Operation *op, SlapReply *rs )
 235 {
 236         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 237         BackendDB *b0 = op->o_bd;
 238         BackendInfo *bi0 = op->o_bd->bd_info;
 239         int rc = SLAP_CB_CONTINUE;
 240
 241         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 242         if ( op->o_bd == b0 )
 243                 return SLAP_CB_CONTINUE;
 244
 245         b0->bd_info = on->on_info->oi_orig;
 246
 247         /* if the subordinate database has overlays, the bi_chk_controls()
 248          * hook is actually over_aux_chk_controls(); in case it actually
 249          * wraps a missing hok, we need to mimic the behavior
 250          * of the frontend applied to that database */
 251         if ( op->o_bd->bd_info->bi_chk_controls ) {
 252                 rc = ( *op->o_bd->bd_info->bi_chk_controls )( op, rs );
 253         }
 254
 255
 256         if ( rc == SLAP_CB_CONTINUE ) {
 257                 rc = backend_check_controls( op, rs );
 258         }
 259
 260         op->o_bd = b0;
 261         op->o_bd->bd_info = bi0;
 262         return rc;
 263 }
 264
 265 static int
 266 glue_sub_search( Operation *op, SlapReply *rs, BackendDB *b0,
 267         slap_overinst *on )
 268 {
 269         /* Process any overlays on the master backend */
 270         if ( op->o_bd == b0 && on->on_next ) {
 271                 BackendInfo *bi = op->o_bd->bd_info;
 272                 int rc = SLAP_CB_CONTINUE;
 273                 for ( on=on->on_next; on; on=on->on_next ) {
 274                         op->o_bd->bd_info = (BackendInfo *)on;
 275                         if ( on->on_bi.bi_op_search ) {
 276                                 rc = on->on_bi.bi_op_search( op, rs );
 277                                 if ( rc != SLAP_CB_CONTINUE )
 278                                         break;
 279                         }
 280                 }
 281                 op->o_bd->bd_info = bi;
 282                 if ( rc != SLAP_CB_CONTINUE )
 283                         return rc;
 284         }
 285         return op->o_bd->be_search( op, rs );
 286 }
 287
 288 static int
 289 glue_op_search ( Operation *op, SlapReply *rs )
 290 {
 291         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 292         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 293         BackendDB *b0 = op->o_bd;
 294         BackendDB *b1 = NULL, *btmp;
 295         BackendInfo *bi0 = op->o_bd->bd_info;
 296         int i;
 297         long stoptime = 0, starttime;
 298         glue_state gs = {NULL, NULL, NULL, 0, 0, 0, 0};
 299         slap_callback cb = { NULL, glue_op_response, NULL, NULL };
 300         int scope0, tlimit0;
 301         struct berval dn, ndn, *pdn;
 302
 303         cb.sc_private = &gs;
 304
 305         cb.sc_next = op->o_callback;
 306
 307         starttime = op->o_time;
 308         stoptime = slap_get_time () + op->ors_tlimit;
 309
 310         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 311         b0->bd_info = on->on_info->oi_orig;
 312
 313         switch (op->ors_scope) {
 314         case LDAP_SCOPE_BASE:
 315                 if ( op->o_bd == b0 )
 316                         return SLAP_CB_CONTINUE;
 317
 318                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 319                 if (op->o_bd && op->o_bd->be_search) {
 320                         rs->sr_err = op->o_bd->be_search( op, rs );
 321                 }
 322                 return rs->sr_err;
 323
 324         case LDAP_SCOPE_ONELEVEL:
 325         case LDAP_SCOPE_SUBTREE:
 326         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 327                 op->o_callback = &cb;
 328                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 329                 scope0 = op->ors_scope;
 330                 tlimit0 = op->ors_tlimit;
 331                 dn = op->o_req_dn;
 332                 ndn = op->o_req_ndn;
 333                 b1 = op->o_bd;
 334
 335                 /*
 336                  * Execute in reverse order, most specific first
 337                  */
 338                 for (i = gi->gi_nodes; i >= 0; i--) {
 339                         if ( i == gi->gi_nodes ) {
 340                                 btmp = b0;
 341                                 pdn = &gi->gi_pdn;
 342                         } else {
 343                                 btmp = gi->gi_n[i].gn_be;
 344                                 pdn = &gi->gi_n[i].gn_pdn;
 345                         }
 346                         if (!btmp || !btmp->be_search)
 347                                 continue;
 348                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 349                                 continue;
 350
 351                         if (tlimit0 != SLAP_NO_LIMIT) {
 352                                 op->o_time = slap_get_time();
 353                                 op->ors_tlimit = stoptime - op->o_time;
 354                                 if (op->ors_tlimit <= 0) {
 355                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 356                                         break;
 357                                 }
 358                         }
 359                         rs->sr_err = 0;
 360                         /*
 361                          * check for abandon
 362                          */
 363                         if (op->o_abandon) {
 364                                 goto end_of_loop;
 365                         }
 366                         op->o_bd = btmp;
 367
 368                         assert( op->o_bd->be_suffix != NULL );
 369                         assert( op->o_bd->be_nsuffix != NULL );
 370
 371                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 372                                 dn_match(pdn, &ndn))
 373                         {
 374                                 op->ors_scope = LDAP_SCOPE_BASE;
 375                                 op->o_req_dn = op->o_bd->be_suffix[0];
 376                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 377                                 rs->sr_err = op->o_bd->be_search(op, rs);
 378                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 379                                         gs.err = LDAP_SUCCESS;
 380                                 }
 381
 382                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 383                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 384                         {
 385                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 386
 387                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 388                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 389                         {
 390                                 op->o_req_dn = op->o_bd->be_suffix[0];
 391                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 392                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 393                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 394                                         gs.err = LDAP_SUCCESS;
 395                                 }
 396                                 op->o_req_dn = dn;
 397                                 op->o_req_ndn = ndn;
 398
 399                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 400                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 401                         }
 402
 403                         switch ( gs.err ) {
 404
 405                         /*
 406                          * Add errors that should result in dropping
 407                          * the search
 408                          */
 409                         case LDAP_SIZELIMIT_EXCEEDED:
 410                         case LDAP_TIMELIMIT_EXCEEDED:
 411                         case LDAP_ADMINLIMIT_EXCEEDED:
 412                         case LDAP_NO_SUCH_OBJECT:
 413 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 414                         case LDAP_X_CANNOT_CHAIN:
 415 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 416                                 goto end_of_loop;
 417
 418                         default:
 419                                 break;
 420                         }
 421                 }
 422 end_of_loop:;
 423                 op->ors_scope = scope0;
 424                 op->ors_tlimit = tlimit0;
 425                 op->o_time = starttime;
 426                 op->o_req_dn = dn;
 427                 op->o_req_ndn = ndn;
 428
 429                 break;
 430         }
 431         if ( op->o_abandon ) {
 432                 rs->sr_err = SLAPD_ABANDON;
 433         } else {
 434                 op->o_callback = cb.sc_next;
 435                 rs->sr_err = gs.err;
 436                 rs->sr_matched = gs.matched;
 437                 rs->sr_ref = gs.refs;
 438                 rs->sr_ctrls = gs.ctrls;
 439
 440                 send_ldap_result( op, rs );
 441         }
 442
 443         op->o_bd = b0;
 444         op->o_bd->bd_info = bi0;
 445         if (gs.matched)
 446                 free (gs.matched);
 447         if (gs.refs)
 448                 ber_bvarray_free(gs.refs);
 449         if (gs.ctrls) {
 450                 for (i = gs.nctrls; --i >= 0; ) {
 451                         if (!BER_BVISNULL( &gs.ctrls[i]->ldctl_value ))
 452                                 free(gs.ctrls[i]->ldctl_value.bv_val);
 453                         free(gs.ctrls[i]);
 454                 }
 455                 free(gs.ctrls);
 456         }
 457         return rs->sr_err;
 458 }
 459
 460 static BackendDB toolDB;
 461
 462 static int
 463 glue_tool_entry_open (
 464         BackendDB *b0,
 465         int mode
 466 )
 467 {
 468         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 469
 470         /* We don't know which backend to talk to yet, so just
 471          * remember the mode and move on...
 472          */
 473
 474         glueMode = mode;
 475         glueBack = NULL;
 476         toolDB = *b0;
 477         toolDB.bd_info = oi->oi_orig;
 478
 479         return 0;
 480 }
 481
 482 static int
 483 glue_tool_entry_close (
 484         BackendDB *b0
 485 )
 486 {
 487         int rc = 0;
 488
 489         if (glueBack) {
 490                 if (!glueBack->be_entry_close)
 491                         return 0;
 492                 rc = glueBack->be_entry_close (glueBack);
 493         }
 494         return rc;
 495 }
 496
 497 static slap_overinst *
 498 glue_tool_inst(
 499         BackendInfo *bi
 500 )
 501 {
 502         slap_overinfo   *oi = (slap_overinfo *)bi;
 503         slap_overinst   *on;
 504
 505         for ( on = oi->oi_list; on; on=on->on_next ) {
 506                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 507                         return on;
 508         }
 509         return NULL;
 510 }
 511
 512 /* This function will only be called in tool mode */
 513 static int
 514 glue_open (
 515         BackendInfo *bi
 516 )
 517 {
 518         slap_overinst *on = glue_tool_inst( bi );
 519         glueinfo                *gi = on->on_bi.bi_private;
 520         static int glueOpened = 0;
 521         int i, j, same, bsame = 0, rc = 0;
 522
 523         if (glueOpened) return 0;
 524
 525         glueOpened = 1;
 526
 527         /* If we were invoked in tool mode, open all the underlying backends */
 528         if (slapMode & SLAP_TOOL_MODE) {
 529                 for (i = 0; i<gi->gi_nodes; i++) {
 530                         same = 0;
 531                         /* Same bi_open as our main backend? */
 532                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 533                                 on->on_info->oi_orig->bi_open )
 534                                 bsame = 1;
 535
 536                         /* Loop thru the bd_info's and make sure we only
 537                          * invoke their bi_open functions once each.
 538                          */
 539                         for ( j = 0; j<i; j++ ) {
 540                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 541                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 542                                         same = 1;
 543                                         break;
 544                                 }
 545                         }
 546                         /* OK, it's unique and non-NULL, call it. */
 547                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 548                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 549                                         gi->gi_n[i].gn_be->bd_info );
 550                         /* Let backend.c take care of the rest of startup */
 551                         if ( !rc )
 552                                 rc = backend_startup_one( gi->gi_n[i].gn_be );
 553                         if ( rc ) break;
 554                 }
 555                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 556                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 557
 558         } /* other case is impossible */
 559         return rc;
 560 }
 561
 562 /* This function will only be called in tool mode */
 563 static int
 564 glue_close (
 565         BackendInfo *bi
 566 )
 567 {
 568         static int glueClosed = 0;
 569         int rc = 0;
 570
 571         if (glueClosed) return 0;
 572
 573         glueClosed = 1;
 574
 575         if (slapMode & SLAP_TOOL_MODE) {
 576                 rc = backend_shutdown( NULL );
 577         }
 578         return rc;
 579 }
 580
 581 static int
 582 glue_entry_release_rw (
 583         Operation *op,
 584         Entry *e,
 585         int rw
 586 )
 587 {
 588         BackendDB *b0, b2;
 589         int rc = -1;
 590
 591         b0 = op->o_bd;
 592         b2 = *op->o_bd;
 593         b2.bd_info = (BackendInfo *)glue_tool_inst( op->o_bd->bd_info );
 594         op->o_bd = glue_back_select (&b2, &e->e_nname);
 595
 596         if ( op->o_bd->be_release ) {
 597                 rc = op->o_bd->be_release( op, e, rw );
 598
 599         } else {
 600                 /* FIXME: mimic be_entry_release_rw
 601                  * when no be_release() available */
 602                 /* free entry */
 603                 entry_free( e );
 604                 rc = 0;
 605         }
 606         op->o_bd = b0;
 607         return rc;
 608 }
 609
 610 static ID
 611 glue_tool_entry_first (
 612         BackendDB *b0
 613 )
 614 {
 615         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 616         glueinfo                *gi = on->on_bi.bi_private;
 617         int i;
 618
 619         /* If we're starting from scratch, start at the most general */
 620         if (!glueBack) {
 621                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 622                         glueBack = &toolDB;
 623                 } else {
 624                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 625                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 626                                         gi->gi_n[i].gn_be->be_entry_first) {
 627                                                 glueBack = gi->gi_n[i].gn_be;
 628                                         break;
 629                                 }
 630                         }
 631                 }
 632         }
 633         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 634                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 635                 return NOID;
 636
 637         return glueBack->be_entry_first (glueBack);
 638 }
 639
 640 static ID
 641 glue_tool_entry_next (
 642         BackendDB *b0
 643 )
 644 {
 645         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 646         glueinfo                *gi = on->on_bi.bi_private;
 647         int i;
 648         ID rc;
 649
 650         if (!glueBack || !glueBack->be_entry_next)
 651                 return NOID;
 652
 653         rc = glueBack->be_entry_next (glueBack);
 654
 655         /* If we ran out of entries in one database, move on to the next */
 656         while (rc == NOID) {
 657                 if ( glueBack && glueBack->be_entry_close )
 658                         glueBack->be_entry_close (glueBack);
 659                 for (i=0; i<gi->gi_nodes; i++) {
 660                         if (gi->gi_n[i].gn_be == glueBack)
 661                                 break;
 662                 }
 663                 if (i == 0) {
 664                         glueBack = NULL;
 665                         break;
 666                 } else {
 667                         glueBack = gi->gi_n[i-1].gn_be;
 668                         rc = glue_tool_entry_first (b0);
 669                 }
 670         }
 671         return rc;
 672 }
 673
 674 static Entry *
 675 glue_tool_entry_get (
 676         BackendDB *b0,
 677         ID id
 678 )
 679 {
 680         if (!glueBack || !glueBack->be_entry_get)
 681                 return NULL;
 682
 683         return glueBack->be_entry_get (glueBack, id);
 684 }
 685
 686 static ID
 687 glue_tool_entry_put (
 688         BackendDB *b0,
 689         Entry *e,
 690         struct berval *text
 691 )
 692 {
 693         BackendDB *be, b2;
 694         int rc = -1;
 695
 696         b2 = *b0;
 697         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 698         be = glue_back_select (&b2, &e->e_nname);
 699         if ( be == &b2 ) be = &toolDB;
 700
 701         if (!be->be_entry_put)
 702                 return NOID;
 703
 704         if (!glueBack) {
 705                 if ( be->be_entry_open ) {
 706                         rc = be->be_entry_open (be, glueMode);
 707                 }
 708                 if (rc != 0) {
 709                         return NOID;
 710                 }
 711         } else if (be != glueBack) {
 712                 /* If this entry belongs in a different branch than the
 713                  * previous one, close the current database and open the
 714                  * new one.
 715                  */
 716                 if ( glueBack->be_entry_close ) {
 717                         glueBack->be_entry_close (glueBack);
 718                 }
 719                 if ( be->be_entry_open ) {
 720                         rc = be->be_entry_open (be, glueMode);
 721                 }
 722                 if (rc != 0) {
 723                         return NOID;
 724                 }
 725         }
 726         glueBack = be;
 727         return be->be_entry_put (be, e, text);
 728 }
 729
 730 static int
 731 glue_tool_entry_reindex (
 732         BackendDB *b0,
 733         ID id
 734 )
 735 {
 736         if (!glueBack || !glueBack->be_entry_reindex)
 737                 return -1;
 738
 739         return glueBack->be_entry_reindex (glueBack, id);
 740 }
 741
 742 static int
 743 glue_tool_sync (
 744         BackendDB *b0
 745 )
 746 {
 747         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 748         glueinfo                *gi = on->on_bi.bi_private;
 749         BackendInfo             *bi = b0->bd_info;
 750         int i;
 751
 752         /* just sync everyone */
 753         for (i = 0; i<gi->gi_nodes; i++)
 754                 if (gi->gi_n[i].gn_be->be_sync)
 755                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
 756         b0->bd_info = on->on_info->oi_orig;
 757         if ( b0->be_sync )
 758                 b0->be_sync( b0 );
 759         b0->bd_info = bi;
 760         return 0;
 761 }
 762
 763 static int
 764 glue_db_init(
 765         BackendDB *be
 766 )
 767 {
 768         slap_overinst   *on = (slap_overinst *)be->bd_info;
 769         slap_overinfo   *oi = on->on_info;
 770         BackendInfo     *bi = oi->oi_orig;
 771         glueinfo *gi;
 772
 773         gi = ch_calloc( 1, sizeof(glueinfo));
 774         on->on_bi.bi_private = gi;
 775         dnParent( be->be_nsuffix, &gi->gi_pdn );
 776
 777         /* Currently the overlay framework doesn't handle these entry points
 778          * but we need them....
 779          */
 780         oi->oi_bi.bi_open = glue_open;
 781         oi->oi_bi.bi_close = glue_close;
 782
 783         oi->oi_bi.bi_entry_release_rw = glue_entry_release_rw;
 784
 785         /* Only advertise these if the root DB supports them */
 786         if ( bi->bi_tool_entry_open )
 787                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
 788         if ( bi->bi_tool_entry_close )
 789                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
 790         if ( bi->bi_tool_entry_first )
 791                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
 792         if ( bi->bi_tool_entry_next )
 793                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
 794         if ( bi->bi_tool_entry_get )
 795                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
 796         if ( bi->bi_tool_entry_put )
 797                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
 798         if ( bi->bi_tool_entry_reindex )
 799                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
 800         if ( bi->bi_tool_sync )
 801                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
 802
 803         /*FIXME : need to add support */
 804         oi->oi_bi.bi_tool_dn2id_get = 0;
 805         oi->oi_bi.bi_tool_id2entry_get = 0;
 806         oi->oi_bi.bi_tool_entry_modify = 0;
 807
 808         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
 809
 810         return 0;
 811 }
 812
 813 static int
 814 glue_db_destroy (
 815         BackendDB *be
 816 )
 817 {
 818         slap_overinst   *on = (slap_overinst *)be->bd_info;
 819         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 820
 821         free (gi);
 822         return SLAP_CB_CONTINUE;
 823 }
 824
 825 static int
 826 glue_db_close(
 827         BackendDB *be
 828 )
 829 {
 830         slap_overinst   *on = (slap_overinst *)be->bd_info;
 831
 832         on->on_info->oi_bi.bi_db_close = 0;
 833         return 0;
 834 }
 835
 836 int
 837 glue_sub_del( BackendDB *b0 )
 838 {
 839         BackendDB *be;
 840         int rc = 0;
 841
 842         /* Find the top backend for this subordinate */
 843         be = b0;
 844         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 845                 slap_overinfo *oi;
 846                 slap_overinst *on;
 847                 glueinfo *gi;
 848                 int i;
 849
 850                 if ( SLAP_GLUE_SUBORDINATE( be ))
 851                         continue;
 852                 if ( !SLAP_GLUE_INSTANCE( be ))
 853                         continue;
 854                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
 855                         continue;
 856
 857                 /* OK, got the right backend, find the overlay */
 858                 oi = (slap_overinfo *)be->bd_info;
 859                 for ( on=oi->oi_list; on; on=on->on_next ) {
 860                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 861                                 break;
 862                 }
 863                 assert( on != NULL );
 864                 gi = on->on_bi.bi_private;
 865                 for ( i=0; i < gi->gi_nodes; i++ ) {
 866                         if ( gi->gi_n[i].gn_be == b0 ) {
 867                                 int j;
 868
 869                                 for (j=i+1; j < gi->gi_nodes; j++)
 870                                         gi->gi_n[j-1] = gi->gi_n[j];
 871
 872                                 gi->gi_nodes--;
 873                         }
 874                 }
 875         }
 876         if ( be == NULL )
 877                 rc = LDAP_NO_SUCH_OBJECT;
 878
 879         return rc;
 880 }
 881
 882 typedef struct glue_Addrec {
 883         struct glue_Addrec *ga_next;
 884         BackendDB *ga_be;
 885 } glue_Addrec;
 886
 887 /* List of added subordinates */
 888 static glue_Addrec *ga_list;
 889
 890 /* Attach all the subordinate backends to their superior */
 891 int
 892 glue_sub_attach()
 893 {
 894         glue_Addrec *ga, *gnext = NULL;
 895         int rc = 0;
 896
 897         /* For all the subordinate backends */
 898         for ( ga=ga_list; ga != NULL; ga = gnext ) {
 899                 BackendDB *be;
 900
 901                 gnext = ga->ga_next;
 902
 903                 /* Find the top backend for this subordinate */
 904                 be = ga->ga_be;
 905                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 906                         slap_overinfo *oi;
 907                         slap_overinst *on;
 908                         glueinfo *gi;
 909
 910                         if ( SLAP_GLUE_SUBORDINATE( be ))
 911                                 continue;
 912                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
 913                                 continue;
 914
 915                         /* If it's not already configured, set up the overlay */
 916                         if ( !SLAP_GLUE_INSTANCE( be )) {
 917                                 rc = overlay_config( be, glue.on_bi.bi_type );
 918                                 if ( rc )
 919                                         break;
 920                         }
 921                         /* Find the overlay instance */
 922                         oi = (slap_overinfo *)be->bd_info;
 923                         for ( on=oi->oi_list; on; on=on->on_next ) {
 924                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 925                                         break;
 926                         }
 927                         assert( on != NULL );
 928                         gi = on->on_bi.bi_private;
 929                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
 930                                 gi->gi_nodes * sizeof(gluenode));
 931                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
 932                         dnParent( &ga->ga_be->be_nsuffix[0],
 933                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
 934                         gi->gi_nodes++;
 935                         on->on_bi.bi_private = gi;
 936                         break;
 937                 }
 938                 if ( !be ) {
 939                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
 940                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
 941                         rc = LDAP_NO_SUCH_OBJECT;
 942                 }
 943                 ch_free( ga );
 944                 if ( rc ) break;
 945         }
 946
 947         ga_list = gnext;
 948
 949         return rc;
 950 }
 951
 952 int
 953 glue_sub_add( BackendDB *be, int advert, int online )
 954 {
 955         glue_Addrec *ga;
 956         int rc = 0;
 957
 958         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
 959         if ( advert )
 960                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
 961
 962         ga = ch_malloc( sizeof( glue_Addrec ));
 963         ga->ga_next = ga_list;
 964         ga->ga_be = be;
 965         ga_list = ga;
 966
 967         if ( online )
 968                 rc = glue_sub_attach();
 969
 970         return rc;
 971 }
 972
 973 int
 974 glue_sub_init()
 975 {
 976         glue.on_bi.bi_type = "glue";
 977
 978         glue.on_bi.bi_db_init = glue_db_init;
 979         glue.on_bi.bi_db_close = glue_db_close;
 980         glue.on_bi.bi_db_destroy = glue_db_destroy;
 981
 982         glue.on_bi.bi_op_search = glue_op_search;
 983         glue.on_bi.bi_op_modify = glue_op_func;
 984         glue.on_bi.bi_op_modrdn = glue_op_func;
 985         glue.on_bi.bi_op_add = glue_op_func;
 986         glue.on_bi.bi_op_delete = glue_op_func;
 987
 988         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
 989         glue.on_bi.bi_chk_controls = glue_chk_controls;
 990
 991         return overlay_register( &glue );
 992 }