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 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 382                         case LDAP_CANNOT_CHAIN:
 383 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 384                                 goto end_of_loop;
 385
 386                         default:
 387                                 break;
 388                         }
 389                 }
 390 end_of_loop:;
 391                 op->ors_scope = scope0;
 392                 op->ors_slimit = slimit0;
 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                 op->o_callback = cb.sc_next;
 401                 rs->sr_err = gs.err;
 402                 rs->sr_matched = gs.matched;
 403                 rs->sr_ref = gs.refs;
 404
 405                 send_ldap_result( op, rs );
 406         }
 407
 408         op->o_bd = b0;
 409         op->o_bd->bd_info = bi0;
 410         if (gs.matched)
 411                 free (gs.matched);
 412         if (gs.refs)
 413                 ber_bvarray_free(gs.refs);
 414         return rs->sr_err;
 415 }
 416
 417 static BackendDB toolDB;
 418
 419 static int
 420 glue_tool_entry_open (
 421         BackendDB *b0,
 422         int mode
 423 )
 424 {
 425         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 426
 427         /* We don't know which backend to talk to yet, so just
 428          * remember the mode and move on...
 429          */
 430
 431         glueMode = mode;
 432         glueBack = NULL;
 433         toolDB = *b0;
 434         toolDB.bd_info = oi->oi_orig;
 435
 436         return 0;
 437 }
 438
 439 static int
 440 glue_tool_entry_close (
 441         BackendDB *b0
 442 )
 443 {
 444         int rc = 0;
 445
 446         if (glueBack) {
 447                 if (!glueBack->be_entry_close)
 448                         return 0;
 449                 rc = glueBack->be_entry_close (glueBack);
 450         }
 451         return rc;
 452 }
 453
 454 static slap_overinst *
 455 glue_tool_inst(
 456         BackendInfo *bi
 457 )
 458 {
 459         slap_overinfo   *oi = (slap_overinfo *)bi;
 460         slap_overinst   *on;
 461
 462         for ( on = oi->oi_list; on; on=on->on_next ) {
 463                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 464                         return on;
 465         }
 466         return NULL;
 467 }
 468
 469 /* This function will only be called in tool mode */
 470 static int
 471 glue_open (
 472         BackendInfo *bi
 473 )
 474 {
 475         slap_overinst *on = glue_tool_inst( bi );
 476         glueinfo                *gi = on->on_bi.bi_private;
 477         static int glueOpened = 0;
 478         int i, rc = 0;
 479
 480         if (glueOpened) return 0;
 481
 482         glueOpened = 1;
 483
 484         /* If we were invoked in tool mode, open all the underlying backends */
 485         if (slapMode & SLAP_TOOL_MODE) {
 486                 rc = backend_startup( NULL );
 487         } /* other case is impossible */
 488         return rc;
 489 }
 490
 491 /* This function will only be called in tool mode */
 492 static int
 493 glue_close (
 494         BackendInfo *bi
 495 )
 496 {
 497         slap_overinst *on = glue_tool_inst( bi );
 498         glueinfo                *gi = on->on_bi.bi_private;
 499         static int glueClosed = 0;
 500         int i, rc = 0;
 501
 502         if (glueClosed) return 0;
 503
 504         glueClosed = 1;
 505
 506         if (slapMode & SLAP_TOOL_MODE) {
 507                 rc = backend_shutdown( NULL );
 508         }
 509         return rc;
 510 }
 511
 512 static int
 513 glue_entry_release_rw (
 514         Operation *op,
 515         Entry *e,
 516         int rw
 517 )
 518 {
 519         BackendDB *b0, b2;
 520         int rc;
 521
 522         b0 = op->o_bd;
 523         b2 = *op->o_bd;
 524         b2.bd_info = (BackendInfo *)glue_tool_inst( op->o_bd->bd_info );
 525         op->o_bd = glue_back_select (&b2, &e->e_nname);
 526
 527         rc = op->o_bd->be_release( op, e, rw );
 528         op->o_bd = b0;
 529         return rc;
 530 }
 531
 532 static ID
 533 glue_tool_entry_first (
 534         BackendDB *b0
 535 )
 536 {
 537         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 538         glueinfo                *gi = on->on_bi.bi_private;
 539         int i;
 540
 541         /* If we're starting from scratch, start at the most general */
 542         if (!glueBack) {
 543                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 544                         glueBack = &toolDB;
 545                 } else {
 546                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 547                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 548                                         gi->gi_n[i].gn_be->be_entry_first) {
 549                                                 glueBack = gi->gi_n[i].gn_be;
 550                                         break;
 551                                 }
 552                         }
 553                 }
 554         }
 555         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 556                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 557                 return NOID;
 558
 559         return glueBack->be_entry_first (glueBack);
 560 }
 561
 562 static ID
 563 glue_tool_entry_next (
 564         BackendDB *b0
 565 )
 566 {
 567         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 568         glueinfo                *gi = on->on_bi.bi_private;
 569         int i;
 570         ID rc;
 571
 572         if (!glueBack || !glueBack->be_entry_next)
 573                 return NOID;
 574
 575         rc = glueBack->be_entry_next (glueBack);
 576
 577         /* If we ran out of entries in one database, move on to the next */
 578         while (rc == NOID) {
 579                 if ( glueBack && glueBack->be_entry_close )
 580                         glueBack->be_entry_close (glueBack);
 581                 for (i=0; i<gi->gi_nodes; i++) {
 582                         if (gi->gi_n[i].gn_be == glueBack)
 583                                 break;
 584                 }
 585                 if (i == 0) {
 586                         glueBack = NULL;
 587                         break;
 588                 } else {
 589                         glueBack = gi->gi_n[i-1].gn_be;
 590                         rc = glue_tool_entry_first (b0);
 591                 }
 592         }
 593         return rc;
 594 }
 595
 596 static Entry *
 597 glue_tool_entry_get (
 598         BackendDB *b0,
 599         ID id
 600 )
 601 {
 602         if (!glueBack || !glueBack->be_entry_get)
 603                 return NULL;
 604
 605         return glueBack->be_entry_get (glueBack, id);
 606 }
 607
 608 static ID
 609 glue_tool_entry_put (
 610         BackendDB *b0,
 611         Entry *e,
 612         struct berval *text
 613 )
 614 {
 615         BackendDB *be, b2;
 616         int rc;
 617
 618         b2 = *b0;
 619         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 620         be = glue_back_select (&b2, &e->e_nname);
 621         if ( be == &b2 ) be = &toolDB;
 622
 623         if (!be->be_entry_put)
 624                 return NOID;
 625
 626         if (!glueBack) {
 627                 rc = be->be_entry_open (be, glueMode);
 628                 if (rc != 0)
 629                         return NOID;
 630         } else if (be != glueBack) {
 631                 /* If this entry belongs in a different branch than the
 632                  * previous one, close the current database and open the
 633                  * new one.
 634                  */
 635                 glueBack->be_entry_close (glueBack);
 636                 rc = be->be_entry_open (be, glueMode);
 637                 if (rc != 0)
 638                         return NOID;
 639         }
 640         glueBack = be;
 641         return be->be_entry_put (be, e, text);
 642 }
 643
 644 static int
 645 glue_tool_entry_reindex (
 646         BackendDB *b0,
 647         ID id
 648 )
 649 {
 650         if (!glueBack || !glueBack->be_entry_reindex)
 651                 return -1;
 652
 653         return glueBack->be_entry_reindex (glueBack, id);
 654 }
 655
 656 static int
 657 glue_tool_sync (
 658         BackendDB *b0
 659 )
 660 {
 661         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 662         glueinfo                *gi = on->on_bi.bi_private;
 663         BackendInfo             *bi = b0->bd_info;
 664         int i;
 665
 666         /* just sync everyone */
 667         for (i = 0; i<gi->gi_nodes; i++)
 668                 if (gi->gi_n[i].gn_be->be_sync)
 669                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
 670         b0->bd_info = on->on_info->oi_orig;
 671         if ( b0->be_sync )
 672                 b0->be_sync( b0 );
 673         b0->bd_info = bi;
 674         return 0;
 675 }
 676
 677 static int
 678 glue_db_init(
 679         BackendDB *be
 680 )
 681 {
 682         slap_overinst   *on = (slap_overinst *)be->bd_info;
 683         slap_overinfo   *oi = on->on_info;
 684         glueinfo *gi;
 685
 686         gi = ch_calloc( 1, sizeof(glueinfo));
 687         on->on_bi.bi_private = gi;
 688         dnParent( be->be_nsuffix, &gi->gi_pdn );
 689
 690         /* Currently the overlay framework doesn't handle these entry points
 691          * but we need them....
 692          */
 693         oi->oi_bi.bi_open = glue_open;
 694         oi->oi_bi.bi_close = glue_close;
 695
 696         oi->oi_bi.bi_entry_release_rw = glue_entry_release_rw;
 697
 698         oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
 699         oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
 700         oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
 701         oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
 702         oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
 703         oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
 704         oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
 705         oi->oi_bi.bi_tool_sync = glue_tool_sync;
 706
 707         /*FIXME : need to add support */
 708         oi->oi_bi.bi_tool_dn2id_get = 0;
 709         oi->oi_bi.bi_tool_id2entry_get = 0;
 710         oi->oi_bi.bi_tool_entry_modify = 0;
 711
 712         return 0;
 713 }
 714
 715 static int
 716 glue_db_destroy (
 717         BackendDB *be
 718 )
 719 {
 720         slap_overinst   *on = (slap_overinst *)be->bd_info;
 721         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 722
 723         free (gi);
 724         return SLAP_CB_CONTINUE;
 725 }
 726
 727 static int
 728 glue_db_open (
 729         BackendDB *be
 730 )
 731 {
 732         slap_overinst   *on = (slap_overinst *)be->bd_info;
 733         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 734         int i;
 735
 736         for ( i=0; i<gi->gi_nodes; i++ ) {
 737                 int j;
 738
 739                 gi->gi_n[i].gn_be = backendDB + gi->gi_n[i].gn_bx;
 740         }
 741         return 0;
 742 }
 743
 744 static int
 745 glue_db_close(
 746         BackendDB *be
 747 )
 748 {
 749         slap_overinst   *on = (slap_overinst *)be->bd_info;
 750
 751         on->on_info->oi_bi.bi_db_close = NULL;
 752         return 0;
 753 }
 754
 755 static int
 756 glue_db_config(
 757         BackendDB       *be,
 758         const char      *fname,
 759         int             lineno,
 760         int             argc,
 761         char    **argv
 762 )
 763 {
 764         slap_overinst   *on = (slap_overinst *)be->bd_info;
 765         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 766
 767         /* redundant; could be applied just once */
 768         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
 769
 770         if ( strcasecmp( argv[0], "glue-sub" ) == 0 ) {
 771                 int i, async = 0, advertise = 0;
 772                 BackendDB *b2;
 773                 struct berval bv, dn;
 774                 gluenode *gn;
 775
 776                 if ( argc < 2 ) {
 777                         fprintf( stderr, "%s: line %d: too few arguments in "
 778                                 "\"glue-sub <suffixDN> [async] [advertise]\"\n", fname, lineno );
 779                         return -1;
 780                 }
 781                 for ( i = 2; i < argc; i++ ) {
 782                         if ( strcasecmp( argv[i], "async" ) == 0 ) {
 783                                 async = 1;
 784
 785                         } else if ( strcasecmp( argv[i], "advertise" ) == 0 ) {
 786                                 advertise = 1;
 787
 788                         } else {
 789                                 fprintf( stderr, "%s: line %d: unrecognized option "
 790                                         "\"%s\" ignored.\n", fname, lineno, argv[i] );
 791                         }
 792                 }
 793                 ber_str2bv( argv[1], 0, 0, &bv );
 794                 if ( dnNormalize( 0, NULL, NULL, &bv, &dn, NULL )) {
 795                         fprintf( stderr, "invalid suffixDN \"%s\"\n", argv[1] );
 796                         return -1;
 797                 }
 798                 b2 = select_backend( &dn, 0, 1 );
 799                 if ( !b2 ) {
 800                         fprintf( stderr, "%s: line %d: unknown suffix \"%s\"\n",
 801                                 fname, lineno, argv[1] );
 802                         return -1;
 803                 }
 804                 SLAP_DBFLAGS(b2) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
 805                 if ( advertise ) {
 806                         SLAP_DBFLAGS(b2) |= SLAP_DBFLAG_GLUE_ADVERTISE;
 807                 }
 808                 gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
 809                         gi->gi_nodes * sizeof(gluenode));
 810                 gi->gi_n[gi->gi_nodes].gn_bx = b2 - backendDB;
 811                 dnParent( &b2->be_nsuffix[0], &gi->gi_n[gi->gi_nodes].gn_pdn );
 812                 gi->gi_n[gi->gi_nodes].gn_async = async;
 813                 gi->gi_nodes++;
 814                 on->on_bi.bi_private = gi;
 815                 return 0;
 816         }
 817         return SLAP_CONF_UNKNOWN;
 818 }
 819
 820 int
 821 glue_init()
 822 {
 823         glue.on_bi.bi_type = "glue";
 824
 825         glue.on_bi.bi_db_init = glue_db_init;
 826         glue.on_bi.bi_db_config = glue_db_config;
 827         glue.on_bi.bi_db_open = glue_db_open;
 828         glue.on_bi.bi_db_close = glue_db_close;
 829         glue.on_bi.bi_db_destroy = glue_db_destroy;
 830
 831         glue.on_bi.bi_op_search = glue_op_search;
 832         glue.on_bi.bi_op_modify = glue_op_func;
 833         glue.on_bi.bi_op_modrdn = glue_op_func;
 834         glue.on_bi.bi_op_add = glue_op_func;
 835         glue.on_bi.bi_op_delete = glue_op_func;
 836
 837         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
 838         glue.on_bi.bi_chk_controls = glue_chk_controls;
 839
 840         return overlay_register( &glue );
 841 }
 842
 843 #if SLAPD_OVER_GLUE == SLAPD_MOD_DYNAMIC
 844 int
 845 init_module( int argc, char *argv[] )
 846 {
 847         return glue_init();
 848 }
 849 #endif  /* SLAPD_OVER_GLUE == SLAPD_MOD_DYNAMIC */
 850
 851 #endif  /* defined(SLAPD_OVER_GLUE */