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 2001-2005 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 #include <stdio.h>
  32
  33 #include <ac/string.h>
  34 #include <ac/socket.h>
  35
  36 #define SLAPD_TOOLS
  37 #include "slap.h"
  38
  39 typedef struct gluenode {
  40         BackendDB *gn_be;
  41         struct berval gn_pdn;
  42 } gluenode;
  43
  44 typedef struct glueinfo {
  45         int gi_nodes;
  46         struct berval gi_pdn;
  47         gluenode gi_n[1];
  48 } glueinfo;
  49
  50 static slap_overinst    glue;
  51
  52 static int glueMode;
  53 static BackendDB *glueBack;
  54
  55 static slap_response glue_op_response;
  56
  57 /* Just like select_backend, but only for our backends */
  58 static BackendDB *
  59 glue_back_select (
  60         BackendDB *be,
  61         struct berval *dn
  62 )
  63 {
  64         slap_overinst   *on = (slap_overinst *)be->bd_info;
  65         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
  66         int i;
  67
  68         for (i = 0; i<gi->gi_nodes; i++) {
  69                 assert( gi->gi_n[i].gn_be->be_nsuffix != NULL );
  70
  71                 if (dnIsSuffix(dn, &gi->gi_n[i].gn_be->be_nsuffix[0])) {
  72                         return gi->gi_n[i].gn_be;
  73                 }
  74         }
  75         be->bd_info = on->on_info->oi_orig;
  76         return be;
  77 }
  78
  79
  80 typedef struct glue_state {
  81         int err;
  82         int matchlen;
  83         char *matched;
  84         int nrefs;
  85         BerVarray refs;
  86 } glue_state;
  87
  88 static int
  89 glue_op_response ( Operation *op, SlapReply *rs )
  90 {
  91         glue_state *gs = op->o_callback->sc_private;
  92
  93         switch(rs->sr_type) {
  94         case REP_SEARCH:
  95         case REP_SEARCHREF:
  96                 return SLAP_CB_CONTINUE;
  97
  98         default:
  99                 if (rs->sr_err == LDAP_SUCCESS ||
 100                         rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ||
 101                         rs->sr_err == LDAP_TIMELIMIT_EXCEEDED ||
 102                         rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 103                         rs->sr_err == LDAP_NO_SUCH_OBJECT ||
 104                         gs->err != LDAP_SUCCESS)
 105                         gs->err = rs->sr_err;
 106                 if (gs->err == LDAP_SUCCESS && gs->matched) {
 107                         ch_free (gs->matched);
 108                         gs->matched = NULL;
 109                         gs->matchlen = 0;
 110                 }
 111                 if (gs->err != LDAP_SUCCESS && rs->sr_matched) {
 112                         int len;
 113                         len = strlen (rs->sr_matched);
 114                         if (len > gs->matchlen) {
 115                                 if (gs->matched)
 116                                         ch_free (gs->matched);
 117                                 gs->matched = ch_strdup (rs->sr_matched);
 118                                 gs->matchlen = len;
 119                         }
 120                 }
 121                 if (rs->sr_ref) {
 122                         int i, j, k;
 123                         BerVarray new;
 124
 125                         for (i=0; rs->sr_ref[i].bv_val; i++);
 126
 127                         j = gs->nrefs;
 128                         if (!j) {
 129                                 new = ch_malloc ((i+1)*sizeof(struct berval));
 130                         } else {
 131                                 new = ch_realloc(gs->refs,
 132                                         (j+i+1)*sizeof(struct berval));
 133                         }
 134                         for (k=0; k<i; j++,k++) {
 135                                 ber_dupbv( &new[j], &rs->sr_ref[k] );
 136                         }
 137                         new[j].bv_val = NULL;
 138                         gs->nrefs = j;
 139                         gs->refs = new;
 140                 }
 141         }
 142         return 0;
 143 }
 144
 145 static int
 146 glue_op_func ( Operation *op, SlapReply *rs )
 147 {
 148         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 149         BackendDB *b0 = op->o_bd;
 150         BackendInfo *bi0 = op->o_bd->bd_info;
 151         BI_op_modify **func;
 152         slap_operation_t which = op_bind;
 153         int rc;
 154
 155         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 156         b0->bd_info = on->on_info->oi_orig;
 157
 158         switch(op->o_tag) {
 159         case LDAP_REQ_ADD: which = op_add; break;
 160         case LDAP_REQ_DELETE: which = op_delete; break;
 161         case LDAP_REQ_MODIFY: which = op_modify; break;
 162         case LDAP_REQ_MODRDN: which = op_modrdn; break;
 163         default: assert( 0 ); break;
 164         }
 165
 166         func = &op->o_bd->bd_info->bi_op_bind;
 167         if ( func[which] )
 168                 rc = func[which]( op, rs );
 169         else
 170                 rc = SLAP_CB_CONTINUE;
 171
 172         op->o_bd = b0;
 173         op->o_bd->bd_info = bi0;
 174         return rc;
 175 }
 176
 177 static int
 178 glue_chk_referrals ( Operation *op, SlapReply *rs )
 179 {
 180         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 181         BackendDB *b0 = op->o_bd;
 182         BackendInfo *bi0 = op->o_bd->bd_info;
 183         int rc;
 184
 185         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 186         b0->bd_info = on->on_info->oi_orig;
 187
 188         if ( op->o_bd->bd_info->bi_chk_referrals )
 189                 rc = ( *op->o_bd->bd_info->bi_chk_referrals )( op, rs );
 190         else
 191                 rc = SLAP_CB_CONTINUE;
 192
 193         op->o_bd = b0;
 194         op->o_bd->bd_info = bi0;
 195         return rc;
 196 }
 197
 198 static int
 199 glue_chk_controls ( Operation *op, SlapReply *rs )
 200 {
 201         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 202         BackendDB *b0 = op->o_bd;
 203         BackendInfo *bi0 = op->o_bd->bd_info;
 204         int rc = SLAP_CB_CONTINUE;
 205
 206         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 207         b0->bd_info = on->on_info->oi_orig;
 208
 209         /* if the subordinate database has overlays, the bi_chk_controls()
 210          * hook is actually over_aux_chk_controls(); in case it actually
 211          * wraps a missing hok, we need to mimic the behavior
 212          * of the frontend applied to that database */
 213         if ( op->o_bd->bd_info->bi_chk_controls ) {
 214                 rc = ( *op->o_bd->bd_info->bi_chk_controls )( op, rs );
 215         }
 216
 217
 218         if ( rc == SLAP_CB_CONTINUE ) {
 219                 rc = backend_check_controls( op, rs );
 220         }
 221
 222         op->o_bd = b0;
 223         op->o_bd->bd_info = bi0;
 224         return rc;
 225 }
 226
 227 static int
 228 glue_op_search ( Operation *op, SlapReply *rs )
 229 {
 230         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 231         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 232         BackendDB *b0 = op->o_bd;
 233         BackendDB *b1 = NULL, *btmp;
 234         BackendInfo *bi0 = op->o_bd->bd_info;
 235         int i;
 236         long stoptime = 0;
 237         glue_state gs = {0, 0, NULL, 0, NULL};
 238         slap_callback cb = { NULL, glue_op_response, NULL, NULL };
 239         int scope0, tlimit0;
 240         struct berval dn, ndn, *pdn;
 241
 242         cb.sc_private = &gs;
 243
 244         cb.sc_next = op->o_callback;
 245
 246         stoptime = slap_get_time () + op->ors_tlimit;
 247
 248         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 249         b0->bd_info = on->on_info->oi_orig;
 250
 251         switch (op->ors_scope) {
 252         case LDAP_SCOPE_BASE:
 253                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 254                 if (op->o_bd && op->o_bd->be_search) {
 255                         rs->sr_err = op->o_bd->be_search( op, rs );
 256                 }
 257                 return rs->sr_err;
 258
 259         case LDAP_SCOPE_ONELEVEL:
 260         case LDAP_SCOPE_SUBTREE:
 261 #ifdef LDAP_SCOPE_SUBORDINATE
 262         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 263 #endif
 264
 265 #if 0
 266                 if ( op->o_sync ) {
 267                         if (op->o_bd && op->o_bd->be_search) {
 268                                 rs->sr_err = op->o_bd->be_search( op, rs );
 269                         } else {
 270                                 send_ldap_error(op, rs, LDAP_UNWILLING_TO_PERFORM,
 271                                                 "No search target found");
 272                         }
 273                         return rs->sr_err;
 274                 }
 275 #endif
 276
 277                 op->o_callback = &cb;
 278                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 279                 scope0 = op->ors_scope;
 280                 tlimit0 = op->ors_tlimit;
 281                 dn = op->o_req_dn;
 282                 ndn = op->o_req_ndn;
 283                 b1 = op->o_bd;
 284
 285                 /*
 286                  * Execute in reverse order, most general first
 287                  */
 288                 for (i = gi->gi_nodes; i >= 0; i--) {
 289                         if ( i == gi->gi_nodes ) {
 290                                 btmp = b0;
 291                                 pdn = &gi->gi_pdn;
 292                         } else {
 293                                 btmp = gi->gi_n[i].gn_be;
 294                                 pdn = &gi->gi_n[i].gn_pdn;
 295                         }
 296                         if (!btmp || !btmp->be_search)
 297                                 continue;
 298                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 299                                 continue;
 300                         if (tlimit0 != SLAP_NO_LIMIT) {
 301                                 op->ors_tlimit = stoptime - slap_get_time ();
 302                                 if (op->ors_tlimit <= 0) {
 303                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 304                                         break;
 305                                 }
 306                         }
 307                         rs->sr_err = 0;
 308                         /*
 309                          * check for abandon
 310                          */
 311                         if (op->o_abandon) {
 312                                 goto end_of_loop;
 313                         }
 314                         op->o_bd = btmp;
 315
 316                         assert( op->o_bd->be_suffix != NULL );
 317                         assert( op->o_bd->be_nsuffix != NULL );
 318
 319                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 320                                 dn_match(pdn, &ndn))
 321                         {
 322                                 op->ors_scope = LDAP_SCOPE_BASE;
 323                                 op->o_req_dn = op->o_bd->be_suffix[0];
 324                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 325                                 rs->sr_err = op->o_bd->be_search(op, rs);
 326
 327                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 328                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 329                         {
 330                                 rs->sr_err = op->o_bd->be_search( op, rs );
 331
 332                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 333                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 334                         {
 335                                 op->o_req_dn = op->o_bd->be_suffix[0];
 336                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 337                                 rs->sr_err = op->o_bd->be_search( op, rs );
 338                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 339                                         gs.err = LDAP_SUCCESS;
 340                                 }
 341
 342                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 343                                 rs->sr_err = op->o_bd->be_search( op, rs );
 344                         }
 345
 346                         switch ( gs.err ) {
 347
 348                         /*
 349                          * Add errors that should result in dropping
 350                          * the search
 351                          */
 352                         case LDAP_SIZELIMIT_EXCEEDED:
 353                         case LDAP_TIMELIMIT_EXCEEDED:
 354                         case LDAP_ADMINLIMIT_EXCEEDED:
 355                         case LDAP_NO_SUCH_OBJECT:
 356 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 357                         case LDAP_X_CANNOT_CHAIN:
 358 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 359                                 goto end_of_loop;
 360
 361                         default:
 362                                 break;
 363                         }
 364                 }
 365 end_of_loop:;
 366                 op->ors_scope = scope0;
 367                 op->ors_tlimit = tlimit0;
 368                 op->o_req_dn = dn;
 369                 op->o_req_ndn = ndn;
 370
 371                 break;
 372         }
 373         if ( op->o_abandon ) {
 374                 rs->sr_err = SLAPD_ABANDON;
 375         } else {
 376                 op->o_callback = cb.sc_next;
 377                 rs->sr_err = gs.err;
 378                 rs->sr_matched = gs.matched;
 379                 rs->sr_ref = gs.refs;
 380
 381                 send_ldap_result( op, rs );
 382         }
 383
 384         op->o_bd = b0;
 385         op->o_bd->bd_info = bi0;
 386         if (gs.matched)
 387                 free (gs.matched);
 388         if (gs.refs)
 389                 ber_bvarray_free(gs.refs);
 390         return rs->sr_err;
 391 }
 392
 393 static BackendDB toolDB;
 394
 395 static int
 396 glue_tool_entry_open (
 397         BackendDB *b0,
 398         int mode
 399 )
 400 {
 401         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 402
 403         /* We don't know which backend to talk to yet, so just
 404          * remember the mode and move on...
 405          */
 406
 407         glueMode = mode;
 408         glueBack = NULL;
 409         toolDB = *b0;
 410         toolDB.bd_info = oi->oi_orig;
 411
 412         return 0;
 413 }
 414
 415 static int
 416 glue_tool_entry_close (
 417         BackendDB *b0
 418 )
 419 {
 420         int rc = 0;
 421
 422         if (glueBack) {
 423                 if (!glueBack->be_entry_close)
 424                         return 0;
 425                 rc = glueBack->be_entry_close (glueBack);
 426         }
 427         return rc;
 428 }
 429
 430 static slap_overinst *
 431 glue_tool_inst(
 432         BackendInfo *bi
 433 )
 434 {
 435         slap_overinfo   *oi = (slap_overinfo *)bi;
 436         slap_overinst   *on;
 437
 438         for ( on = oi->oi_list; on; on=on->on_next ) {
 439                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 440                         return on;
 441         }
 442         return NULL;
 443 }
 444
 445 /* This function will only be called in tool mode */
 446 static int
 447 glue_open (
 448         BackendInfo *bi
 449 )
 450 {
 451         slap_overinst *on = glue_tool_inst( bi );
 452         glueinfo                *gi = on->on_bi.bi_private;
 453         static int glueOpened = 0;
 454         int i, j, same, bsame = 0, rc = 0;
 455
 456         if (glueOpened) return 0;
 457
 458         glueOpened = 1;
 459
 460         /* If we were invoked in tool mode, open all the underlying backends */
 461         if (slapMode & SLAP_TOOL_MODE) {
 462                 for (i = 0; i<gi->gi_nodes; i++) {
 463                         same = 0;
 464                         /* Same bi_open as our main backend? */
 465                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 466                                 on->on_info->oi_orig->bi_open )
 467                                 bsame = 1;
 468
 469                         /* Loop thru the bd_info's and make sure we only
 470                          * invoke their bi_open functions once each.
 471                          */
 472                         for ( j = 0; j<i; j++ ) {
 473                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 474                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 475                                         same = 1;
 476                                         break;
 477                                 }
 478                         }
 479                         /* OK, it's unique and non-NULL, call it. */
 480                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 481                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 482                                         gi->gi_n[i].gn_be->bd_info );
 483                         /* Let backend.c take care of the rest of startup */
 484                         if ( !rc )
 485                                 rc = backend_startup_one( gi->gi_n[i].gn_be );
 486                         if ( rc ) break;
 487                 }
 488                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 489                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 490
 491         } /* other case is impossible */
 492         return rc;
 493 }
 494
 495 /* This function will only be called in tool mode */
 496 static int
 497 glue_close (
 498         BackendInfo *bi
 499 )
 500 {
 501         static int glueClosed = 0;
 502         int rc = 0;
 503
 504         if (glueClosed) return 0;
 505
 506         glueClosed = 1;
 507
 508         if (slapMode & SLAP_TOOL_MODE) {
 509                 rc = backend_shutdown( NULL );
 510         }
 511         return rc;
 512 }
 513
 514 static int
 515 glue_entry_release_rw (
 516         Operation *op,
 517         Entry *e,
 518         int rw
 519 )
 520 {
 521         BackendDB *b0, b2;
 522         int rc = -1;
 523
 524         b0 = op->o_bd;
 525         b2 = *op->o_bd;
 526         b2.bd_info = (BackendInfo *)glue_tool_inst( op->o_bd->bd_info );
 527         op->o_bd = glue_back_select (&b2, &e->e_nname);
 528
 529         if ( op->o_bd->be_release ) {
 530                 rc = op->o_bd->be_release( op, e, rw );
 531
 532         } else {
 533                 /* FIXME: mimic be_entry_release_rw
 534                  * when no be_release() available */
 535                 /* free entry */
 536                 entry_free( e );
 537                 rc = 0;
 538         }
 539         op->o_bd = b0;
 540         return rc;
 541 }
 542
 543 static ID
 544 glue_tool_entry_first (
 545         BackendDB *b0
 546 )
 547 {
 548         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 549         glueinfo                *gi = on->on_bi.bi_private;
 550         int i;
 551
 552         /* If we're starting from scratch, start at the most general */
 553         if (!glueBack) {
 554                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 555                         glueBack = &toolDB;
 556                 } else {
 557                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 558                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 559                                         gi->gi_n[i].gn_be->be_entry_first) {
 560                                                 glueBack = gi->gi_n[i].gn_be;
 561                                         break;
 562                                 }
 563                         }
 564                 }
 565         }
 566         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 567                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 568                 return NOID;
 569
 570         return glueBack->be_entry_first (glueBack);
 571 }
 572
 573 static ID
 574 glue_tool_entry_next (
 575         BackendDB *b0
 576 )
 577 {
 578         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 579         glueinfo                *gi = on->on_bi.bi_private;
 580         int i;
 581         ID rc;
 582
 583         if (!glueBack || !glueBack->be_entry_next)
 584                 return NOID;
 585
 586         rc = glueBack->be_entry_next (glueBack);
 587
 588         /* If we ran out of entries in one database, move on to the next */
 589         while (rc == NOID) {
 590                 if ( glueBack && glueBack->be_entry_close )
 591                         glueBack->be_entry_close (glueBack);
 592                 for (i=0; i<gi->gi_nodes; i++) {
 593                         if (gi->gi_n[i].gn_be == glueBack)
 594                                 break;
 595                 }
 596                 if (i == 0) {
 597                         glueBack = NULL;
 598                         break;
 599                 } else {
 600                         glueBack = gi->gi_n[i-1].gn_be;
 601                         rc = glue_tool_entry_first (b0);
 602                 }
 603         }
 604         return rc;
 605 }
 606
 607 static Entry *
 608 glue_tool_entry_get (
 609         BackendDB *b0,
 610         ID id
 611 )
 612 {
 613         if (!glueBack || !glueBack->be_entry_get)
 614                 return NULL;
 615
 616         return glueBack->be_entry_get (glueBack, id);
 617 }
 618
 619 static ID
 620 glue_tool_entry_put (
 621         BackendDB *b0,
 622         Entry *e,
 623         struct berval *text
 624 )
 625 {
 626         BackendDB *be, b2;
 627         int rc = -1;
 628
 629         b2 = *b0;
 630         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 631         be = glue_back_select (&b2, &e->e_nname);
 632         if ( be == &b2 ) be = &toolDB;
 633
 634         if (!be->be_entry_put)
 635                 return NOID;
 636
 637         if (!glueBack) {
 638                 if ( be->be_entry_open ) {
 639                         rc = be->be_entry_open (be, glueMode);
 640                 }
 641                 if (rc != 0) {
 642                         return NOID;
 643                 }
 644         } else if (be != glueBack) {
 645                 /* If this entry belongs in a different branch than the
 646                  * previous one, close the current database and open the
 647                  * new one.
 648                  */
 649                 if ( glueBack->be_entry_close ) {
 650                         glueBack->be_entry_close (glueBack);
 651                 }
 652                 if ( be->be_entry_open ) {
 653                         rc = be->be_entry_open (be, glueMode);
 654                 }
 655                 if (rc != 0) {
 656                         return NOID;
 657                 }
 658         }
 659         glueBack = be;
 660         return be->be_entry_put (be, e, text);
 661 }
 662
 663 static int
 664 glue_tool_entry_reindex (
 665         BackendDB *b0,
 666         ID id
 667 )
 668 {
 669         if (!glueBack || !glueBack->be_entry_reindex)
 670                 return -1;
 671
 672         return glueBack->be_entry_reindex (glueBack, id);
 673 }
 674
 675 static int
 676 glue_tool_sync (
 677         BackendDB *b0
 678 )
 679 {
 680         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 681         glueinfo                *gi = on->on_bi.bi_private;
 682         BackendInfo             *bi = b0->bd_info;
 683         int i;
 684
 685         /* just sync everyone */
 686         for (i = 0; i<gi->gi_nodes; i++)
 687                 if (gi->gi_n[i].gn_be->be_sync)
 688                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
 689         b0->bd_info = on->on_info->oi_orig;
 690         if ( b0->be_sync )
 691                 b0->be_sync( b0 );
 692         b0->bd_info = bi;
 693         return 0;
 694 }
 695
 696 static int
 697 glue_db_init(
 698         BackendDB *be
 699 )
 700 {
 701         slap_overinst   *on = (slap_overinst *)be->bd_info;
 702         slap_overinfo   *oi = on->on_info;
 703         BackendInfo     *bi = oi->oi_orig;
 704         glueinfo *gi;
 705
 706         gi = ch_calloc( 1, sizeof(glueinfo));
 707         on->on_bi.bi_private = gi;
 708         dnParent( be->be_nsuffix, &gi->gi_pdn );
 709
 710         /* Currently the overlay framework doesn't handle these entry points
 711          * but we need them....
 712          */
 713         oi->oi_bi.bi_open = glue_open;
 714         oi->oi_bi.bi_close = glue_close;
 715
 716         oi->oi_bi.bi_entry_release_rw = glue_entry_release_rw;
 717
 718         /* Only advertise these if the root DB supports them */
 719         if ( bi->bi_tool_entry_open )
 720                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
 721         if ( bi->bi_tool_entry_close )
 722                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
 723         if ( bi->bi_tool_entry_first )
 724                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
 725         if ( bi->bi_tool_entry_next )
 726                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
 727         if ( bi->bi_tool_entry_get )
 728                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
 729         if ( bi->bi_tool_entry_put )
 730                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
 731         if ( bi->bi_tool_entry_reindex )
 732                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
 733         if ( bi->bi_tool_sync )
 734                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
 735
 736         /*FIXME : need to add support */
 737         oi->oi_bi.bi_tool_dn2id_get = 0;
 738         oi->oi_bi.bi_tool_id2entry_get = 0;
 739         oi->oi_bi.bi_tool_entry_modify = 0;
 740
 741         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
 742
 743         return 0;
 744 }
 745
 746 static int
 747 glue_db_destroy (
 748         BackendDB *be
 749 )
 750 {
 751         slap_overinst   *on = (slap_overinst *)be->bd_info;
 752         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 753
 754         free (gi);
 755         return SLAP_CB_CONTINUE;
 756 }
 757
 758 static int
 759 glue_db_close(
 760         BackendDB *be
 761 )
 762 {
 763         slap_overinst   *on = (slap_overinst *)be->bd_info;
 764
 765         on->on_info->oi_bi.bi_db_close = NULL;
 766         return 0;
 767 }
 768
 769 int
 770 glue_sub_del( BackendDB *b0 )
 771 {
 772         BackendDB *be;
 773         int rc = 0;
 774
 775         /* Find the top backend for this subordinate */
 776         be = b0;
 777         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 778                 slap_overinfo *oi;
 779                 slap_overinst *on;
 780                 glueinfo *gi;
 781                 int i;
 782
 783                 if ( SLAP_GLUE_SUBORDINATE( be ))
 784                         continue;
 785                 if ( !SLAP_GLUE_INSTANCE( be ))
 786                         continue;
 787                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
 788                         continue;
 789
 790                 /* OK, got the right backend, find the overlay */
 791                 oi = (slap_overinfo *)be->bd_info;
 792                 for ( on=oi->oi_list; on; on=on->on_next ) {
 793                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 794                                 break;
 795                 }
 796                 assert( on != NULL );
 797                 gi = on->on_bi.bi_private;
 798                 for ( i=0; i < gi->gi_nodes; i++ ) {
 799                         if ( gi->gi_n[i].gn_be == b0 ) {
 800                                 int j;
 801
 802                                 for (j=i+1; j < gi->gi_nodes; j++)
 803                                         gi->gi_n[j-1] = gi->gi_n[j];
 804
 805                                 gi->gi_nodes--;
 806                         }
 807                 }
 808         }
 809         if ( be == NULL )
 810                 rc = LDAP_NO_SUCH_OBJECT;
 811
 812         return rc;
 813 }
 814
 815 typedef struct glue_Addrec {
 816         struct glue_Addrec *ga_next;
 817         BackendDB *ga_be;
 818 } glue_Addrec;
 819
 820 /* List of added subordinates */
 821 static glue_Addrec *ga_list;
 822
 823 /* Attach all the subordinate backends to their superior */
 824 int
 825 glue_sub_attach()
 826 {
 827         glue_Addrec *ga, *gnext = NULL;
 828         int rc = 0;
 829
 830         /* For all the subordinate backends */
 831         for ( ga=ga_list; ga != NULL; ga = gnext ) {
 832                 BackendDB *be;
 833
 834                 gnext = ga->ga_next;
 835
 836                 /* Find the top backend for this subordinate */
 837                 be = ga->ga_be;
 838                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 839                         slap_overinfo *oi;
 840                         slap_overinst *on;
 841                         glueinfo *gi;
 842
 843                         if ( SLAP_GLUE_SUBORDINATE( be ))
 844                                 continue;
 845                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
 846                                 continue;
 847
 848                         /* If it's not already configured, set up the overlay */
 849                         if ( !SLAP_GLUE_INSTANCE( be )) {
 850                                 rc = overlay_config( be, glue.on_bi.bi_type );
 851                                 if ( rc )
 852                                         break;
 853                         }
 854                         /* Find the overlay instance */
 855                         oi = (slap_overinfo *)be->bd_info;
 856                         for ( on=oi->oi_list; on; on=on->on_next ) {
 857                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 858                                         break;
 859                         }
 860                         assert( on != NULL );
 861                         gi = on->on_bi.bi_private;
 862                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
 863                                 gi->gi_nodes * sizeof(gluenode));
 864                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
 865                         dnParent( &ga->ga_be->be_nsuffix[0],
 866                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
 867                         gi->gi_nodes++;
 868                         on->on_bi.bi_private = gi;
 869                         break;
 870                 }
 871                 if ( !be ) {
 872                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
 873                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
 874                         rc = LDAP_NO_SUCH_OBJECT;
 875                 }
 876                 ch_free( ga );
 877                 if ( rc ) break;
 878         }
 879
 880         ga_list = gnext;
 881
 882         return rc;
 883 }
 884
 885 int
 886 glue_sub_add( BackendDB *be, int advert, int online )
 887 {
 888         glue_Addrec *ga;
 889         int rc = 0;
 890
 891         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
 892         if ( advert )
 893                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
 894
 895         ga = ch_malloc( sizeof( glue_Addrec ));
 896         ga->ga_next = ga_list;
 897         ga->ga_be = be;
 898         ga_list = ga;
 899
 900         if ( online )
 901                 rc = glue_sub_attach();
 902
 903         return rc;
 904 }
 905
 906 int
 907 glue_sub_init()
 908 {
 909         glue.on_bi.bi_type = "glue";
 910
 911         glue.on_bi.bi_db_init = glue_db_init;
 912         glue.on_bi.bi_db_close = glue_db_close;
 913         glue.on_bi.bi_db_destroy = glue_db_destroy;
 914
 915         glue.on_bi.bi_op_search = glue_op_search;
 916         glue.on_bi.bi_op_modify = glue_op_func;
 917         glue.on_bi.bi_op_modrdn = glue_op_func;
 918         glue.on_bi.bi_op_add = glue_op_func;
 919         glue.on_bi.bi_op_delete = glue_op_func;
 920
 921         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
 922         glue.on_bi.bi_chk_controls = glue_chk_controls;
 923
 924         return overlay_register( &glue );
 925 }