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

   1 /* glue.c - backend glue overlay */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2001-2005 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 #ifdef SLAPD_OVER_GLUE
  32
  33 #include <stdio.h>
  34
  35 #include <ac/string.h>
  36 #include <ac/socket.h>
  37
  38 #define SLAPD_TOOLS
  39 #include "slap.h"
  40
  41 typedef struct gluenode {
  42         BackendDB *gn_be;
  43         int     gn_bx;
  44         struct berval gn_pdn;
  45         int gn_async;
  46 } gluenode;
  47
  48 typedef struct glueinfo {
  49         int gi_nodes;
  50         struct berval gi_pdn;
  51         gluenode gi_n[1];
  52 } glueinfo;
  53
  54 static slap_overinst    glue;
  55
  56 static int glueMode;
  57 static BackendDB *glueBack;
  58
  59 static slap_response glue_op_response;
  60
  61 /* Just like select_backend, but only for our backends */
  62 static BackendDB *
  63 glue_back_select (
  64         BackendDB *be,
  65         struct berval *dn
  66 )
  67 {
  68         slap_overinst   *on = (slap_overinst *)be->bd_info;
  69         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
  70         int i;
  71
  72         for (i = 0; i<gi->gi_nodes; i++) {
  73                 assert( gi->gi_n[i].gn_be->be_nsuffix );
  74
  75                 if (dnIsSuffix(dn, &gi->gi_n[i].gn_be->be_nsuffix[0])) {
  76                         return gi->gi_n[i].gn_be;
  77                 }
  78         }
  79         be->bd_info = on->on_info->oi_orig;
  80         return be;
  81 }
  82
  83
  84 typedef struct glue_state {
  85         int err;
  86         int slimit;
  87         int matchlen;
  88         char *matched;
  89         int nrefs;
  90         BerVarray refs;
  91 } glue_state;
  92
  93 static int
  94 glue_op_response ( Operation *op, SlapReply *rs )
  95 {
  96         glue_state *gs = op->o_callback->sc_private;
  97
  98         switch(rs->sr_type) {
  99         case REP_SEARCH:
 100                 if ( gs->slimit != SLAP_NO_LIMIT
 101                                 && rs->sr_nentries >= gs->slimit )
 102                 {
 103                         rs->sr_err = gs->err = LDAP_SIZELIMIT_EXCEEDED;
 104                         return -1;
 105                 }
 106                 /* fallthru */
 107         case REP_SEARCHREF:
 108                 return SLAP_CB_CONTINUE;
 109
 110         default:
 111                 if (rs->sr_err == LDAP_SUCCESS ||
 112                         rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ||
 113                         rs->sr_err == LDAP_TIMELIMIT_EXCEEDED ||
 114                         rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 115                         rs->sr_err == LDAP_NO_SUCH_OBJECT ||
 116                         gs->err != LDAP_SUCCESS)
 117                         gs->err = rs->sr_err;
 118                 if (gs->err == LDAP_SUCCESS && gs->matched) {
 119                         ch_free (gs->matched);
 120                         gs->matched = NULL;
 121                         gs->matchlen = 0;
 122                 }
 123                 if (gs->err != LDAP_SUCCESS && rs->sr_matched) {
 124                         int len;
 125                         len = strlen (rs->sr_matched);
 126                         if (len > gs->matchlen) {
 127                                 if (gs->matched)
 128                                         ch_free (gs->matched);
 129                                 gs->matched = ch_strdup (rs->sr_matched);
 130                                 gs->matchlen = len;
 131                         }
 132                 }
 133                 if (rs->sr_ref) {
 134                         int i, j, k;
 135                         BerVarray new;
 136
 137                         for (i=0; rs->sr_ref[i].bv_val; i++);
 138
 139                         j = gs->nrefs;
 140                         if (!j) {
 141                                 new = ch_malloc ((i+1)*sizeof(struct berval));
 142                         } else {
 143                                 new = ch_realloc(gs->refs,
 144                                         (j+i+1)*sizeof(struct berval));
 145                         }
 146                         for (k=0; k<i; j++,k++) {
 147                                 ber_dupbv( &new[j], &rs->sr_ref[k] );
 148                         }
 149                         new[j].bv_val = NULL;
 150                         gs->nrefs = j;
 151                         gs->refs = new;
 152                 }
 153         }
 154         return 0;
 155 }
 156
 157 enum glue_which {
 158         op_modify = 0,
 159         op_modrdn,
 160         op_add,
 161         op_delete
 162 };
 163
 164 static int
 165 glue_op_func ( Operation *op, SlapReply *rs )
 166 {
 167         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 168         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 169         BackendDB *b0 = op->o_bd;
 170         BackendInfo *bi0 = op->o_bd->bd_info;
 171         BI_op_modify **func;
 172         enum glue_which which;
 173         int rc;
 174
 175         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 176         b0->bd_info = on->on_info->oi_orig;
 177
 178         switch(op->o_tag) {
 179         case LDAP_REQ_ADD: which = op_add; break;
 180         case LDAP_REQ_DELETE: which = op_delete; break;
 181         case LDAP_REQ_MODIFY: which = op_modify; break;
 182         case LDAP_REQ_MODRDN: which = op_modrdn; break;
 183         }
 184
 185         func = &op->o_bd->bd_info->bi_op_modify;
 186         if ( func[which] )
 187                 rc = func[which]( op, rs );
 188         else
 189                 rc = SLAP_CB_CONTINUE;
 190
 191         op->o_bd = b0;
 192         op->o_bd->bd_info = bi0;
 193         return rc;
 194 }
 195
 196 static int
 197 glue_chk_referrals ( Operation *op, SlapReply *rs )
 198 {
 199         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 200         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 201         BackendDB *b0 = op->o_bd;
 202         BackendInfo *bi0 = op->o_bd->bd_info;
 203         int rc;
 204
 205         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 206         b0->bd_info = on->on_info->oi_orig;
 207
 208         if ( op->o_bd->bd_info->bi_chk_referrals )
 209                 rc = ( *op->o_bd->bd_info->bi_chk_referrals )( op, rs );
 210         else
 211                 rc = SLAP_CB_CONTINUE;
 212
 213         op->o_bd = b0;
 214         op->o_bd->bd_info = bi0;
 215         return rc;
 216 }
 217
 218 static int
 219 glue_chk_controls ( Operation *op, SlapReply *rs )
 220 {
 221         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 222         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 223         BackendDB *b0 = op->o_bd;
 224         BackendInfo *bi0 = op->o_bd->bd_info;
 225         int rc = SLAP_CB_CONTINUE;
 226
 227         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 228         b0->bd_info = on->on_info->oi_orig;
 229
 230         /* if the subordinate database has overlays, the bi_chk_controls()
 231          * hook is actually over_aux_chk_controls(); in case it actually
 232          * wraps a missing hok, we need to mimic the behavior
 233          * of the frontend applied to that database */
 234         if ( op->o_bd->bd_info->bi_chk_controls ) {
 235                 rc = ( *op->o_bd->bd_info->bi_chk_controls )( op, rs );
 236         }
 237
 238
 239         if ( rc == SLAP_CB_CONTINUE ) {
 240                 rc = backend_check_controls( op, rs );
 241         }
 242
 243         op->o_bd = b0;
 244         op->o_bd->bd_info = bi0;
 245         return rc;
 246 }
 247
 248 static int
 249 glue_op_search ( Operation *op, SlapReply *rs )
 250 {
 251         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 252         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 253         BackendDB *b0 = op->o_bd;
 254         BackendDB *b1 = NULL, *btmp;
 255         BackendInfo *bi0 = op->o_bd->bd_info;
 256         int i;
 257         long stoptime = 0;
 258         glue_state gs = {0, 0, 0, NULL, 0, NULL};
 259         slap_callback cb = { NULL, glue_op_response, NULL, NULL };
 260         int scope0, slimit0, tlimit0;
 261         struct berval dn, ndn, *pdn;
 262
 263         cb.sc_private = &gs;
 264
 265         cb.sc_next = op->o_callback;
 266
 267         stoptime = slap_get_time () + op->ors_tlimit;
 268
 269         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 270         b0->bd_info = on->on_info->oi_orig;
 271
 272         switch (op->ors_scope) {
 273         case LDAP_SCOPE_BASE:
 274                 return SLAP_CB_CONTINUE;
 275
 276         case LDAP_SCOPE_ONELEVEL:
 277         case LDAP_SCOPE_SUBTREE:
 278 #ifdef LDAP_SCOPE_SUBORDINATE
 279         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 280 #endif
 281
 282 #if 0
 283                 if ( op->o_sync ) {
 284                         if (op->o_bd && op->o_bd->be_search) {
 285                                 rs->sr_err = op->o_bd->be_search( op, rs );
 286                         } else {
 287                                 send_ldap_error(op, rs, LDAP_UNWILLING_TO_PERFORM,
 288                                                 "No search target found");
 289                         }
 290                         return rs->sr_err;
 291                 }
 292 #endif
 293
 294                 op->o_callback = &cb;
 295                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 296                 scope0 = op->ors_scope;
 297                 slimit0 = gs.slimit = op->ors_slimit;
 298                 tlimit0 = op->ors_tlimit;
 299                 dn = op->o_req_dn;
 300                 ndn = op->o_req_ndn;
 301                 b1 = op->o_bd;
 302
 303                 /*
 304                  * Execute in reverse order, most general first
 305                  */
 306                 for (i = gi->gi_nodes; i >= 0; i--) {
 307                         if ( i == gi->gi_nodes ) {
 308                                 btmp = b0;
 309                                 pdn = &gi->gi_pdn;
 310                         } else {
 311                                 btmp = gi->gi_n[i].gn_be;
 312                                 pdn = &gi->gi_n[i].gn_pdn;
 313                         }
 314                         if (!btmp || !btmp->be_search)
 315                                 continue;
 316                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 317                                 continue;
 318                         if (tlimit0 != SLAP_NO_LIMIT) {
 319                                 op->ors_tlimit = stoptime - slap_get_time ();
 320                                 if (op->ors_tlimit <= 0) {
 321                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 322                                         break;
 323                                 }
 324                         }
 325                         if (slimit0 != SLAP_NO_LIMIT) {
 326                                 op->ors_slimit = slimit0 - rs->sr_nentries;
 327                                 if (op->ors_slimit < 0) {
 328                                         rs->sr_err = gs.err = LDAP_SIZELIMIT_EXCEEDED;
 329                                         break;
 330                                 }
 331                         }
 332                         rs->sr_err = 0;
 333                         /*
 334                          * check for abandon
 335                          */
 336                         if (op->o_abandon) {
 337                                 goto end_of_loop;
 338                         }
 339                         op->o_bd = btmp;
 340
 341                         assert( op->o_bd->be_suffix );
 342                         assert( op->o_bd->be_nsuffix );
 343
 344                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 345                                 dn_match(pdn, &ndn))
 346                         {
 347                                 op->ors_scope = LDAP_SCOPE_BASE;
 348                                 op->o_req_dn = op->o_bd->be_suffix[0];
 349                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 350                                 rs->sr_err = op->o_bd->be_search(op, rs);
 351
 352                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 353                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 354                         {
 355                                 rs->sr_err = op->o_bd->be_search( op, rs );
 356
 357                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 358                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 359                         {
 360                                 op->o_req_dn = op->o_bd->be_suffix[0];
 361                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 362                                 rs->sr_err = op->o_bd->be_search( op, rs );
 363                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 364                                         gs.err = LDAP_SUCCESS;
 365                                 }
 366
 367                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 368                                 rs->sr_err = op->o_bd->be_search( op, rs );
 369                         }
 370
 371                         switch ( gs.err ) {
 372
 373                         /*
 374                          * Add errors that should result in dropping
 375                          * the search
 376                          */
 377                         case LDAP_SIZELIMIT_EXCEEDED:
 378                         case LDAP_TIMELIMIT_EXCEEDED:
 379                         case LDAP_ADMINLIMIT_EXCEEDED:
 380                         case LDAP_NO_SUCH_OBJECT:
 381                                 goto end_of_loop;
 382
 383                         default:
 384                                 break;
 385                         }
 386                 }
 387 end_of_loop:;
 388                 op->ors_scope = scope0;
 389                 op->ors_slimit = slimit0;
 390                 op->ors_tlimit = tlimit0;
 391                 op->o_req_dn = dn;
 392                 op->o_req_ndn = ndn;
 393
 394                 break;
 395         }
 396         if ( !op->o_abandon ) {
 397                 op->o_callback = cb.sc_next;
 398                 rs->sr_err = gs.err;
 399                 rs->sr_matched = gs.matched;
 400                 rs->sr_ref = gs.refs;
 401
 402                 send_ldap_result( op, rs );
 403         }
 404
 405         op->o_bd = b0;
 406         op->o_bd->bd_info = bi0;
 407         if (gs.matched)
 408                 free (gs.matched);
 409         if (gs.refs)
 410                 ber_bvarray_free(gs.refs);
 411         return rs->sr_err;
 412 }
 413
 414 static BackendDB toolDB;
 415
 416 static int
 417 glue_tool_entry_open (
 418         BackendDB *b0,
 419         int mode
 420 )
 421 {
 422         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 423
 424         /* We don't know which backend to talk to yet, so just
 425          * remember the mode and move on...
 426          */
 427
 428         glueMode = mode;
 429         glueBack = NULL;
 430         toolDB = *b0;
 431         toolDB.bd_info = oi->oi_orig;
 432
 433         return 0;
 434 }
 435
 436 static int
 437 glue_tool_entry_close (
 438         BackendDB *b0
 439 )
 440 {
 441         int rc = 0;
 442
 443         if (glueBack) {
 444                 if (!glueBack->be_entry_close)
 445                         return 0;
 446                 rc = glueBack->be_entry_close (glueBack);
 447         }
 448         return rc;
 449 }
 450
 451 static slap_overinst *
 452 glue_tool_inst(
 453         BackendInfo *bi
 454 )
 455 {
 456         slap_overinfo   *oi = (slap_overinfo *)bi;
 457         slap_overinst   *on;
 458
 459         for ( on = oi->oi_list; on; on=on->on_next ) {
 460                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 461                         return on;
 462         }
 463         return NULL;
 464 }
 465
 466 /* This function will only be called in tool mode */
 467 static int
 468 glue_open (
 469         BackendInfo *bi
 470 )
 471 {
 472         slap_overinst *on = glue_tool_inst( bi );
 473         glueinfo                *gi = on->on_bi.bi_private;
 474         static int glueOpened = 0;
 475         int i, rc = 0;
 476
 477         if (glueOpened) return 0;
 478
 479         glueOpened = 1;
 480
 481         /* If we were invoked in tool mode, open all the underlying backends */
 482         if (slapMode & SLAP_TOOL_MODE) {
 483                 rc = backend_startup( NULL );
 484         } /* other case is impossible */
 485         return rc;
 486 }
 487
 488 /* This function will only be called in tool mode */
 489 static int
 490 glue_close (
 491         BackendInfo *bi
 492 )
 493 {
 494         slap_overinst *on = glue_tool_inst( bi );
 495         glueinfo                *gi = on->on_bi.bi_private;
 496         static int glueClosed = 0;
 497         int i, rc = 0;
 498
 499         if (glueClosed) return 0;
 500
 501         glueClosed = 1;
 502
 503         if (slapMode & SLAP_TOOL_MODE) {
 504                 rc = backend_shutdown( NULL );
 505         }
 506         return rc;
 507 }
 508
 509 static int
 510 glue_entry_release_rw (
 511         Operation *op,
 512         Entry *e,
 513         int rw
 514 )
 515 {
 516         BackendDB *b0, b2;
 517         int rc;
 518
 519         b0 = op->o_bd;
 520         b2 = *op->o_bd;
 521         b2.bd_info = (BackendInfo *)glue_tool_inst( op->o_bd->bd_info );
 522         op->o_bd = glue_back_select (&b2, &e->e_nname);
 523
 524         rc = op->o_bd->be_release( op, e, rw );
 525         op->o_bd = b0;
 526         return rc;
 527 }
 528
 529 static ID
 530 glue_tool_entry_first (
 531         BackendDB *b0
 532 )
 533 {
 534         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 535         glueinfo                *gi = on->on_bi.bi_private;
 536         int i;
 537
 538         /* If we're starting from scratch, start at the most general */
 539         if (!glueBack) {
 540                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 541                         glueBack = &toolDB;
 542                 } else {
 543                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 544                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 545                                         gi->gi_n[i].gn_be->be_entry_first) {
 546                                                 glueBack = gi->gi_n[i].gn_be;
 547                                         break;
 548                                 }
 549                         }
 550                 }
 551         }
 552         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 553                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 554                 return NOID;
 555
 556         return glueBack->be_entry_first (glueBack);
 557 }
 558
 559 static ID
 560 glue_tool_entry_next (
 561         BackendDB *b0
 562 )
 563 {
 564         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 565         glueinfo                *gi = on->on_bi.bi_private;
 566         int i;
 567         ID rc;
 568
 569         if (!glueBack || !glueBack->be_entry_next)
 570                 return NOID;
 571
 572         rc = glueBack->be_entry_next (glueBack);
 573
 574         /* If we ran out of entries in one database, move on to the next */
 575         while (rc == NOID) {
 576                 if ( glueBack && glueBack->be_entry_close )
 577                         glueBack->be_entry_close (glueBack);
 578                 for (i=0; i<gi->gi_nodes; i++) {
 579                         if (gi->gi_n[i].gn_be == glueBack)
 580                                 break;
 581                 }
 582                 if (i == 0) {
 583                         glueBack = NULL;
 584                         break;
 585                 } else {
 586                         glueBack = gi->gi_n[i-1].gn_be;
 587                         rc = glue_tool_entry_first (b0);
 588                 }
 589         }
 590         return rc;
 591 }
 592
 593 static Entry *
 594 glue_tool_entry_get (
 595         BackendDB *b0,
 596         ID id
 597 )
 598 {
 599         if (!glueBack || !glueBack->be_entry_get)
 600                 return NULL;
 601
 602         return glueBack->be_entry_get (glueBack, id);
 603 }
 604
 605 static ID
 606 glue_tool_entry_put (
 607         BackendDB *b0,
 608         Entry *e,
 609         struct berval *text
 610 )
 611 {
 612         BackendDB *be, b2;
 613         int rc;
 614
 615         b2 = *b0;
 616         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 617         be = glue_back_select (&b2, &e->e_nname);
 618         if ( be == &b2 ) be = &toolDB;
 619
 620         if (!be->be_entry_put)
 621                 return NOID;
 622
 623         if (!glueBack) {
 624                 rc = be->be_entry_open (be, glueMode);
 625                 if (rc != 0)
 626                         return NOID;
 627         } else if (be != glueBack) {
 628                 /* If this entry belongs in a different branch than the
 629                  * previous one, close the current database and open the
 630                  * new one.
 631                  */
 632                 glueBack->be_entry_close (glueBack);
 633                 rc = be->be_entry_open (be, glueMode);
 634                 if (rc != 0)
 635                         return NOID;
 636         }
 637         glueBack = be;
 638         return be->be_entry_put (be, e, text);
 639 }
 640
 641 static int
 642 glue_tool_entry_reindex (
 643         BackendDB *b0,
 644         ID id
 645 )
 646 {
 647         if (!glueBack || !glueBack->be_entry_reindex)
 648                 return -1;
 649
 650         return glueBack->be_entry_reindex (glueBack, id);
 651 }
 652
 653 static int
 654 glue_tool_sync (
 655         BackendDB *b0
 656 )
 657 {
 658         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 659         glueinfo                *gi = on->on_bi.bi_private;
 660         BackendInfo             *bi = b0->bd_info;
 661         int i;
 662
 663         /* just sync everyone */
 664         for (i = 0; i<gi->gi_nodes; i++)
 665                 if (gi->gi_n[i].gn_be->be_sync)
 666                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
 667         b0->bd_info = on->on_info->oi_orig;
 668         if ( b0->be_sync )
 669                 b0->be_sync( b0 );
 670         b0->bd_info = bi;
 671         return 0;
 672 }
 673
 674 static int
 675 glue_db_init(
 676         BackendDB *be
 677 )
 678 {
 679         slap_overinst   *on = (slap_overinst *)be->bd_info;
 680         slap_overinfo   *oi = on->on_info;
 681         glueinfo *gi;
 682
 683         gi = ch_calloc( 1, sizeof(glueinfo));
 684         on->on_bi.bi_private = gi;
 685         dnParent( be->be_nsuffix, &gi->gi_pdn );
 686
 687         /* Currently the overlay framework doesn't handle these entry points
 688          * but we need them....
 689          */
 690         oi->oi_bi.bi_open = glue_open;
 691         oi->oi_bi.bi_close = glue_close;
 692
 693         oi->oi_bi.bi_entry_release_rw = glue_entry_release_rw;
 694
 695         oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
 696         oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
 697         oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
 698         oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
 699         oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
 700         oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
 701         oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
 702         oi->oi_bi.bi_tool_sync = glue_tool_sync;
 703
 704         /*FIXME : need to add support */
 705         oi->oi_bi.bi_tool_dn2id_get = 0;
 706         oi->oi_bi.bi_tool_id2entry_get = 0;
 707         oi->oi_bi.bi_tool_entry_modify = 0;
 708
 709         return 0;
 710 }
 711
 712 static int
 713 glue_db_destroy (
 714         BackendDB *be
 715 )
 716 {
 717         slap_overinst   *on = (slap_overinst *)be->bd_info;
 718         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 719
 720         free (gi);
 721         return SLAP_CB_CONTINUE;
 722 }
 723
 724 static int
 725 glue_db_open (
 726         BackendDB *be
 727 )
 728 {
 729         slap_overinst   *on = (slap_overinst *)be->bd_info;
 730         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 731         int i;
 732
 733         for ( i=0; i<gi->gi_nodes; i++ ) {
 734                 int j;
 735
 736                 gi->gi_n[i].gn_be = backendDB + gi->gi_n[i].gn_bx;
 737         }
 738         return 0;
 739 }
 740
 741 static int
 742 glue_db_close(
 743         BackendDB *be
 744 )
 745 {
 746         slap_overinst   *on = (slap_overinst *)be->bd_info;
 747
 748         on->on_info->oi_bi.bi_db_close = NULL;
 749         return 0;
 750 }
 751
 752 static int
 753 glue_db_config(
 754         BackendDB       *be,
 755         const char      *fname,
 756         int             lineno,
 757         int             argc,
 758         char    **argv
 759 )
 760 {
 761         slap_overinst   *on = (slap_overinst *)be->bd_info;
 762         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 763
 764         /* redundant; could be applied just once */
 765         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
 766
 767         if ( strcasecmp( argv[0], "glue-sub" ) == 0 ) {
 768                 int i, async = 0, advertize = 0;
 769                 BackendDB *b2;
 770                 struct berval bv, dn;
 771                 gluenode *gn;
 772
 773                 if ( argc < 2 ) {
 774                         fprintf( stderr, "%s: line %d: too few arguments in "
 775                                 "\"glue-sub <suffixDN> [async] [advertize]\"\n", fname, lineno );
 776                         return -1;
 777                 }
 778                 for ( i = 2; i < argc; i++ ) {
 779                         if ( strcasecmp( argv[i], "async" ) == 0 ) {
 780                                 async = 1;
 781
 782                         } else if ( strcasecmp( argv[i], "advertize" ) == 0 ) {
 783                                 advertize = 1;
 784
 785                         } else {
 786                                 fprintf( stderr, "%s: line %d: unrecognized option "
 787                                         "\"%s\" ignored.\n", fname, lineno, argv[i] );
 788                         }
 789                 }
 790                 ber_str2bv( argv[1], 0, 0, &bv );
 791                 if ( dnNormalize( 0, NULL, NULL, &bv, &dn, NULL )) {
 792                         fprintf( stderr, "invalid suffixDN \"%s\"\n", argv[1] );
 793                         return -1;
 794                 }
 795                 b2 = select_backend( &dn, 0, 1 );
 796                 if ( !b2 ) {
 797                         fprintf( stderr, "%s: line %d: unknown suffix \"%s\"\n",
 798                                 fname, lineno, argv[1] );
 799                         return -1;
 800                 }
 801                 SLAP_DBFLAGS(b2) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
 802                 if ( advertize ) {
 803                         SLAP_DBFLAGS(b2) |= SLAP_DBFLAG_GLUE_ADVERTIZE;
 804                 }
 805                 gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
 806                         gi->gi_nodes * sizeof(gluenode));
 807                 gi->gi_n[gi->gi_nodes].gn_bx = b2 - backendDB;
 808                 dnParent( &b2->be_nsuffix[0], &gi->gi_n[gi->gi_nodes].gn_pdn );
 809                 gi->gi_n[gi->gi_nodes].gn_async = async;
 810                 gi->gi_nodes++;
 811                 on->on_bi.bi_private = gi;
 812                 return 0;
 813         }
 814         return SLAP_CONF_UNKNOWN;
 815 }
 816
 817 int
 818 glue_init()
 819 {
 820         glue.on_bi.bi_type = "glue";
 821
 822         glue.on_bi.bi_db_init = glue_db_init;
 823         glue.on_bi.bi_db_config = glue_db_config;
 824         glue.on_bi.bi_db_open = glue_db_open;
 825         glue.on_bi.bi_db_close = glue_db_close;
 826         glue.on_bi.bi_db_destroy = glue_db_destroy;
 827
 828         glue.on_bi.bi_op_search = glue_op_search;
 829         glue.on_bi.bi_op_modify = glue_op_func;
 830         glue.on_bi.bi_op_modrdn = glue_op_func;
 831         glue.on_bi.bi_op_add = glue_op_func;
 832         glue.on_bi.bi_op_delete = glue_op_func;
 833
 834         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
 835         glue.on_bi.bi_chk_controls = glue_chk_controls;
 836
 837         return overlay_register( &glue );
 838 }
 839
 840 #if SLAPD_OVER_GLUE == SLAPD_MOD_DYNAMIC
 841 int
 842 init_module( int argc, char *argv[] )
 843 {
 844         return glue_init();
 845 }
 846 #endif  /* SLAPD_OVER_GLUE == SLAPD_MOD_DYNAMIC */
 847
 848 #endif  /* defined(SLAPD_OVER_GLUE */