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

   1 /* backglue.c - backend glue */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2001-2006 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 /*
  18  * Functions to glue a bunch of other backends into a single tree.
  19  * All of the glued backends must share a common suffix. E.g., you
  20  * can glue o=foo and ou=bar,o=foo but you can't glue o=foo and o=bar.
  21  *
  22  * The purpose of these functions is to allow you to split a single database
  23  * into pieces (for load balancing purposes, whatever) but still be able
  24  * to treat it as a single database after it's been split. As such, each
  25  * of the glued backends should have identical rootdn.
  26  *  -- Howard Chu
  27  */
  28
  29 #include "portable.h"
  30
  31 #include <stdio.h>
  32
  33 #include <ac/string.h>
  34 #include <ac/socket.h>
  35
  36 #define SLAPD_TOOLS
  37 #include "slap.h"
  38
  39 typedef struct gluenode {
  40         BackendDB *gn_be;
  41         struct berval gn_pdn;
  42 } gluenode;
  43
  44 typedef struct glueinfo {
  45         int gi_nodes;
  46         struct berval gi_pdn;
  47         gluenode gi_n[1];
  48 } glueinfo;
  49
  50 static slap_overinst    glue;
  51
  52 static int glueMode;
  53 static BackendDB *glueBack;
  54
  55 static slap_response glue_op_response;
  56
  57 /* Just like select_backend, but only for our backends */
  58 static BackendDB *
  59 glue_back_select (
  60         BackendDB *be,
  61         struct berval *dn
  62 )
  63 {
  64         slap_overinst   *on = (slap_overinst *)be->bd_info;
  65         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
  66         int i;
  67
  68         for (i = gi->gi_nodes-1; i >= 0; i--) {
  69                 assert( gi->gi_n[i].gn_be->be_nsuffix != NULL );
  70
  71                 if (dnIsSuffix(dn, &gi->gi_n[i].gn_be->be_nsuffix[0])) {
  72                         return gi->gi_n[i].gn_be;
  73                 }
  74         }
  75         be->bd_info = on->on_info->oi_orig;
  76         return be;
  77 }
  78
  79
  80 typedef struct glue_state {
  81         char *matched;
  82         BerVarray refs;
  83         LDAPControl **ctrls;
  84         int err;
  85         int matchlen;
  86         int nrefs;
  87         int nctrls;
  88 } glue_state;
  89
  90 static int
  91 glue_op_response ( Operation *op, SlapReply *rs )
  92 {
  93         glue_state *gs = op->o_callback->sc_private;
  94
  95         switch(rs->sr_type) {
  96         case REP_SEARCH:
  97         case REP_SEARCHREF:
  98         case REP_INTERMEDIATE:
  99                 return SLAP_CB_CONTINUE;
 100
 101         default:
 102                 if (rs->sr_err == LDAP_SUCCESS ||
 103                         rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ||
 104                         rs->sr_err == LDAP_TIMELIMIT_EXCEEDED ||
 105                         rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 106                         rs->sr_err == LDAP_NO_SUCH_OBJECT ||
 107                         gs->err != LDAP_SUCCESS)
 108                         gs->err = rs->sr_err;
 109                 if (gs->err == LDAP_SUCCESS && gs->matched) {
 110                         ch_free (gs->matched);
 111                         gs->matched = NULL;
 112                         gs->matchlen = 0;
 113                 }
 114                 if (gs->err != LDAP_SUCCESS && rs->sr_matched) {
 115                         int len;
 116                         len = strlen (rs->sr_matched);
 117                         if (len > gs->matchlen) {
 118                                 if (gs->matched)
 119                                         ch_free (gs->matched);
 120                                 gs->matched = ch_strdup (rs->sr_matched);
 121                                 gs->matchlen = len;
 122                         }
 123                 }
 124                 if (rs->sr_ref) {
 125                         int i, j, k;
 126                         BerVarray new;
 127
 128                         for (i=0; rs->sr_ref[i].bv_val; i++);
 129
 130                         j = gs->nrefs;
 131                         if (!j) {
 132                                 new = ch_malloc ((i+1)*sizeof(struct berval));
 133                         } else {
 134                                 new = ch_realloc(gs->refs,
 135                                         (j+i+1)*sizeof(struct berval));
 136                         }
 137                         for (k=0; k<i; j++,k++) {
 138                                 ber_dupbv( &new[j], &rs->sr_ref[k] );
 139                         }
 140                         new[j].bv_val = NULL;
 141                         gs->nrefs = j;
 142                         gs->refs = new;
 143                 }
 144                 if (rs->sr_ctrls) {
 145                         int i, j, k;
 146                         LDAPControl **newctrls;
 147
 148                         for (i=0; rs->sr_ctrls[i]; i++);
 149
 150                         j = gs->nctrls;
 151                         if (!j) {
 152                                 newctrls = ch_malloc((i+1)*sizeof(LDAPControl *));
 153                         } else {
 154                                 newctrls = ch_realloc(gs->ctrls,
 155                                         (j+i+1)*sizeof(LDAPControl *));
 156                         }
 157                         for (k=0; k<i; j++,k++) {
 158                                 newctrls[j] = ch_malloc(sizeof(LDAPControl));
 159                                 *newctrls[j] = *rs->sr_ctrls[k];
 160                                 if ( !BER_BVISNULL( &rs->sr_ctrls[k]->ldctl_value ))
 161                                         ber_dupbv( &newctrls[j]->ldctl_value,
 162                                                 &rs->sr_ctrls[k]->ldctl_value );
 163                         }
 164                         newctrls[j] = NULL;
 165                         gs->nctrls = j;
 166                         gs->ctrls = newctrls;
 167                 }
 168         }
 169         return 0;
 170 }
 171
 172 static int
 173 glue_op_func ( Operation *op, SlapReply *rs )
 174 {
 175         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 176         BackendDB *b0 = op->o_bd;
 177         BackendInfo *bi0 = op->o_bd->bd_info;
 178         BI_op_modify **func;
 179         slap_operation_t which = op_bind;
 180         int rc;
 181
 182         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 183
 184         /* If we're on the master backend, let overlay framework handle it */
 185         if ( op->o_bd == b0 )
 186                 return SLAP_CB_CONTINUE;
 187
 188         b0->bd_info = on->on_info->oi_orig;
 189
 190         switch(op->o_tag) {
 191         case LDAP_REQ_ADD: which = op_add; break;
 192         case LDAP_REQ_DELETE: which = op_delete; break;
 193         case LDAP_REQ_MODIFY: which = op_modify; break;
 194         case LDAP_REQ_MODRDN: which = op_modrdn; break;
 195         default: assert( 0 ); break;
 196         }
 197
 198         func = &op->o_bd->bd_info->bi_op_bind;
 199         if ( func[which] )
 200                 rc = func[which]( op, rs );
 201         else
 202                 rc = SLAP_CB_CONTINUE;
 203
 204         op->o_bd = b0;
 205         op->o_bd->bd_info = bi0;
 206         return rc;
 207 }
 208
 209 static int
 210 glue_chk_referrals ( Operation *op, SlapReply *rs )
 211 {
 212         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 213         BackendDB *b0 = op->o_bd;
 214         BackendInfo *bi0 = op->o_bd->bd_info;
 215         int rc;
 216
 217         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 218         if ( op->o_bd == b0 )
 219                 return SLAP_CB_CONTINUE;
 220
 221         b0->bd_info = on->on_info->oi_orig;
 222
 223         if ( op->o_bd->bd_info->bi_chk_referrals )
 224                 rc = ( *op->o_bd->bd_info->bi_chk_referrals )( op, rs );
 225         else
 226                 rc = SLAP_CB_CONTINUE;
 227
 228         op->o_bd = b0;
 229         op->o_bd->bd_info = bi0;
 230         return rc;
 231 }
 232
 233 static int
 234 glue_chk_controls ( Operation *op, SlapReply *rs )
 235 {
 236         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 237         BackendDB *b0 = op->o_bd;
 238         BackendInfo *bi0 = op->o_bd->bd_info;
 239         int rc = SLAP_CB_CONTINUE;
 240
 241         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 242         if ( op->o_bd == b0 )
 243                 return SLAP_CB_CONTINUE;
 244
 245         b0->bd_info = on->on_info->oi_orig;
 246
 247         /* if the subordinate database has overlays, the bi_chk_controls()
 248          * hook is actually over_aux_chk_controls(); in case it actually
 249          * wraps a missing hok, we need to mimic the behavior
 250          * of the frontend applied to that database */
 251         if ( op->o_bd->bd_info->bi_chk_controls ) {
 252                 rc = ( *op->o_bd->bd_info->bi_chk_controls )( op, rs );
 253         }
 254
 255
 256         if ( rc == SLAP_CB_CONTINUE ) {
 257                 rc = backend_check_controls( op, rs );
 258         }
 259
 260         op->o_bd = b0;
 261         op->o_bd->bd_info = bi0;
 262         return rc;
 263 }
 264
 265 static int
 266 glue_sub_search( Operation *op, SlapReply *rs, BackendDB *b0,
 267         slap_overinst *on )
 268 {
 269         /* Process any overlays on the master backend */
 270         if ( op->o_bd == b0 && on->on_next ) {
 271                 BackendInfo *bi = op->o_bd->bd_info;
 272                 int rc = SLAP_CB_CONTINUE;
 273                 for ( on=on->on_next; on; on=on->on_next ) {
 274                         op->o_bd->bd_info = (BackendInfo *)on;
 275                         if ( on->on_bi.bi_op_search ) {
 276                                 rc = on->on_bi.bi_op_search( op, rs );
 277                                 if ( rc != SLAP_CB_CONTINUE )
 278                                         break;
 279                         }
 280                 }
 281                 op->o_bd->bd_info = bi;
 282                 if ( rc != SLAP_CB_CONTINUE )
 283                         return rc;
 284         }
 285         return op->o_bd->be_search( op, rs );
 286 }
 287
 288 static int
 289 glue_op_search ( Operation *op, SlapReply *rs )
 290 {
 291         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 292         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 293         BackendDB *b0 = op->o_bd;
 294         BackendDB *b1 = NULL, *btmp;
 295         BackendInfo *bi0 = op->o_bd->bd_info;
 296         int i;
 297         long stoptime = 0, starttime;
 298         glue_state gs = {NULL, NULL, NULL, 0, 0, 0, 0};
 299         slap_callback cb = { NULL, glue_op_response, NULL, NULL };
 300         int scope0, tlimit0;
 301         struct berval dn, ndn, *pdn;
 302
 303         cb.sc_private = &gs;
 304
 305         cb.sc_next = op->o_callback;
 306
 307         starttime = op->o_time;
 308         stoptime = slap_get_time () + op->ors_tlimit;
 309
 310         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 311         b0->bd_info = on->on_info->oi_orig;
 312
 313         switch (op->ors_scope) {
 314         case LDAP_SCOPE_BASE:
 315                 if ( op->o_bd == b0 )
 316                         return SLAP_CB_CONTINUE;
 317
 318                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 319                 if (op->o_bd && op->o_bd->be_search) {
 320                         rs->sr_err = op->o_bd->be_search( op, rs );
 321                 }
 322                 return rs->sr_err;
 323
 324         case LDAP_SCOPE_ONELEVEL:
 325         case LDAP_SCOPE_SUBTREE:
 326         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 327                 op->o_callback = &cb;
 328                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 329                 scope0 = op->ors_scope;
 330                 tlimit0 = op->ors_tlimit;
 331                 dn = op->o_req_dn;
 332                 ndn = op->o_req_ndn;
 333                 b1 = op->o_bd;
 334
 335                 /*
 336                  * Execute in reverse order, most specific first
 337                  */
 338                 for (i = gi->gi_nodes; i >= 0; i--) {
 339                         if ( i == gi->gi_nodes ) {
 340                                 btmp = b0;
 341                                 pdn = &gi->gi_pdn;
 342                         } else {
 343                                 btmp = gi->gi_n[i].gn_be;
 344                                 pdn = &gi->gi_n[i].gn_pdn;
 345                         }
 346                         if (!btmp || !btmp->be_search)
 347                                 continue;
 348                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 349                                 continue;
 350                         if (get_no_subordinate_glue(op) && btmp != b1)
 351                                 continue;
 352
 353                         if (tlimit0 != SLAP_NO_LIMIT) {
 354                                 op->o_time = slap_get_time();
 355                                 op->ors_tlimit = stoptime - op->o_time;
 356                                 if (op->ors_tlimit <= 0) {
 357                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 358                                         break;
 359                                 }
 360                         }
 361                         rs->sr_err = 0;
 362                         /*
 363                          * check for abandon
 364                          */
 365                         if (op->o_abandon) {
 366                                 goto end_of_loop;
 367                         }
 368                         op->o_bd = btmp;
 369
 370                         assert( op->o_bd->be_suffix != NULL );
 371                         assert( op->o_bd->be_nsuffix != NULL );
 372
 373                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 374                                 dn_match(pdn, &ndn))
 375                         {
 376                                 op->ors_scope = LDAP_SCOPE_BASE;
 377                                 op->o_req_dn = op->o_bd->be_suffix[0];
 378                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 379                                 rs->sr_err = op->o_bd->be_search(op, rs);
 380                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 381                                         gs.err = LDAP_SUCCESS;
 382                                 }
 383                                 op->o_req_dn = dn;
 384                                 op->o_req_ndn = ndn;
 385
 386                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 387                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 388                         {
 389                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 390
 391                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 392                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 393                         {
 394                                 op->o_req_dn = op->o_bd->be_suffix[0];
 395                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 396                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 397                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 398                                         gs.err = LDAP_SUCCESS;
 399                                 }
 400                                 op->o_req_dn = dn;
 401                                 op->o_req_ndn = ndn;
 402
 403                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 404                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 405                         }
 406
 407                         switch ( gs.err ) {
 408
 409                         /*
 410                          * Add errors that should result in dropping
 411                          * the search
 412                          */
 413                         case LDAP_SIZELIMIT_EXCEEDED:
 414                         case LDAP_TIMELIMIT_EXCEEDED:
 415                         case LDAP_ADMINLIMIT_EXCEEDED:
 416                         case LDAP_NO_SUCH_OBJECT:
 417 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 418                         case LDAP_X_CANNOT_CHAIN:
 419 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 420                                 goto end_of_loop;
 421
 422                         default:
 423                                 break;
 424                         }
 425                 }
 426 end_of_loop:;
 427                 op->ors_scope = scope0;
 428                 op->ors_tlimit = tlimit0;
 429                 op->o_time = starttime;
 430                 op->o_req_dn = dn;
 431                 op->o_req_ndn = ndn;
 432
 433                 break;
 434         }
 435         if ( op->o_abandon ) {
 436                 rs->sr_err = SLAPD_ABANDON;
 437         } else {
 438                 op->o_callback = cb.sc_next;
 439                 rs->sr_err = gs.err;
 440                 rs->sr_matched = gs.matched;
 441                 rs->sr_ref = gs.refs;
 442                 rs->sr_ctrls = gs.ctrls;
 443
 444                 send_ldap_result( op, rs );
 445         }
 446
 447         op->o_bd = b0;
 448         op->o_bd->bd_info = bi0;
 449         if (gs.matched)
 450                 free (gs.matched);
 451         if (gs.refs)
 452                 ber_bvarray_free(gs.refs);
 453         if (gs.ctrls) {
 454                 for (i = gs.nctrls; --i >= 0; ) {
 455                         if (!BER_BVISNULL( &gs.ctrls[i]->ldctl_value ))
 456                                 free(gs.ctrls[i]->ldctl_value.bv_val);
 457                         free(gs.ctrls[i]);
 458                 }
 459                 free(gs.ctrls);
 460         }
 461         return rs->sr_err;
 462 }
 463
 464 static BackendDB toolDB;
 465
 466 static int
 467 glue_tool_entry_open (
 468         BackendDB *b0,
 469         int mode
 470 )
 471 {
 472         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 473
 474         /* We don't know which backend to talk to yet, so just
 475          * remember the mode and move on...
 476          */
 477
 478         glueMode = mode;
 479         glueBack = NULL;
 480         toolDB = *b0;
 481         toolDB.bd_info = oi->oi_orig;
 482
 483         return 0;
 484 }
 485
 486 static int
 487 glue_tool_entry_close (
 488         BackendDB *b0
 489 )
 490 {
 491         int rc = 0;
 492
 493         if (glueBack) {
 494                 if (!glueBack->be_entry_close)
 495                         return 0;
 496                 rc = glueBack->be_entry_close (glueBack);
 497         }
 498         return rc;
 499 }
 500
 501 static slap_overinst *
 502 glue_tool_inst(
 503         BackendInfo *bi
 504 )
 505 {
 506         slap_overinfo   *oi = (slap_overinfo *)bi;
 507         slap_overinst   *on;
 508
 509         for ( on = oi->oi_list; on; on=on->on_next ) {
 510                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 511                         return on;
 512         }
 513         return NULL;
 514 }
 515
 516 /* This function will only be called in tool mode */
 517 static int
 518 glue_open (
 519         BackendInfo *bi
 520 )
 521 {
 522         slap_overinst *on = glue_tool_inst( bi );
 523         glueinfo                *gi = on->on_bi.bi_private;
 524         static int glueOpened = 0;
 525         int i, j, same, bsame = 0, rc = 0;
 526
 527         if (glueOpened) return 0;
 528
 529         glueOpened = 1;
 530
 531         /* If we were invoked in tool mode, open all the underlying backends */
 532         if (slapMode & SLAP_TOOL_MODE) {
 533                 for (i = 0; i<gi->gi_nodes; i++) {
 534                         same = 0;
 535                         /* Same bi_open as our main backend? */
 536                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 537                                 on->on_info->oi_orig->bi_open )
 538                                 bsame = 1;
 539
 540                         /* Loop thru the bd_info's and make sure we only
 541                          * invoke their bi_open functions once each.
 542                          */
 543                         for ( j = 0; j<i; j++ ) {
 544                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 545                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 546                                         same = 1;
 547                                         break;
 548                                 }
 549                         }
 550                         /* OK, it's unique and non-NULL, call it. */
 551                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 552                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 553                                         gi->gi_n[i].gn_be->bd_info );
 554                         /* Let backend.c take care of the rest of startup */
 555                         if ( !rc )
 556                                 rc = backend_startup_one( gi->gi_n[i].gn_be );
 557                         if ( rc ) break;
 558                 }
 559                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 560                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 561
 562         } /* other case is impossible */
 563         return rc;
 564 }
 565
 566 /* This function will only be called in tool mode */
 567 static int
 568 glue_close (
 569         BackendInfo *bi
 570 )
 571 {
 572         static int glueClosed = 0;
 573         int rc = 0;
 574
 575         if (glueClosed) return 0;
 576
 577         glueClosed = 1;
 578
 579         if (slapMode & SLAP_TOOL_MODE) {
 580                 rc = backend_shutdown( NULL );
 581         }
 582         return rc;
 583 }
 584
 585 static int
 586 glue_entry_release_rw (
 587         Operation *op,
 588         Entry *e,
 589         int rw
 590 )
 591 {
 592         BackendDB *b0, b2;
 593         int rc = -1;
 594
 595         b0 = op->o_bd;
 596         b2 = *op->o_bd;
 597         b2.bd_info = (BackendInfo *)glue_tool_inst( op->o_bd->bd_info );
 598         op->o_bd = glue_back_select (&b2, &e->e_nname);
 599
 600         if ( op->o_bd->be_release ) {
 601                 rc = op->o_bd->be_release( op, e, rw );
 602
 603         } else {
 604                 /* FIXME: mimic be_entry_release_rw
 605                  * when no be_release() available */
 606                 /* free entry */
 607                 entry_free( e );
 608                 rc = 0;
 609         }
 610         op->o_bd = b0;
 611         return rc;
 612 }
 613
 614 static ID
 615 glue_tool_entry_first (
 616         BackendDB *b0
 617 )
 618 {
 619         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 620         glueinfo                *gi = on->on_bi.bi_private;
 621         int i;
 622
 623         /* If we're starting from scratch, start at the most general */
 624         if (!glueBack) {
 625                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 626                         glueBack = &toolDB;
 627                 } else {
 628                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 629                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 630                                         gi->gi_n[i].gn_be->be_entry_first) {
 631                                                 glueBack = gi->gi_n[i].gn_be;
 632                                         break;
 633                                 }
 634                         }
 635                 }
 636         }
 637         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 638                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 639                 return NOID;
 640
 641         return glueBack->be_entry_first (glueBack);
 642 }
 643
 644 static ID
 645 glue_tool_entry_next (
 646         BackendDB *b0
 647 )
 648 {
 649         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 650         glueinfo                *gi = on->on_bi.bi_private;
 651         int i;
 652         ID rc;
 653
 654         if (!glueBack || !glueBack->be_entry_next)
 655                 return NOID;
 656
 657         rc = glueBack->be_entry_next (glueBack);
 658
 659         /* If we ran out of entries in one database, move on to the next */
 660         while (rc == NOID) {
 661                 if ( glueBack && glueBack->be_entry_close )
 662                         glueBack->be_entry_close (glueBack);
 663                 for (i=0; i<gi->gi_nodes; i++) {
 664                         if (gi->gi_n[i].gn_be == glueBack)
 665                                 break;
 666                 }
 667                 if (i == 0) {
 668                         glueBack = NULL;
 669                         break;
 670                 } else {
 671                         glueBack = gi->gi_n[i-1].gn_be;
 672                         rc = glue_tool_entry_first (b0);
 673                 }
 674         }
 675         return rc;
 676 }
 677
 678 static Entry *
 679 glue_tool_entry_get (
 680         BackendDB *b0,
 681         ID id
 682 )
 683 {
 684         if (!glueBack || !glueBack->be_entry_get)
 685                 return NULL;
 686
 687         return glueBack->be_entry_get (glueBack, id);
 688 }
 689
 690 static ID
 691 glue_tool_entry_put (
 692         BackendDB *b0,
 693         Entry *e,
 694         struct berval *text
 695 )
 696 {
 697         BackendDB *be, b2;
 698         int rc = -1;
 699
 700         b2 = *b0;
 701         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 702         be = glue_back_select (&b2, &e->e_nname);
 703         if ( be == &b2 ) be = &toolDB;
 704
 705         if (!be->be_entry_put)
 706                 return NOID;
 707
 708         if (!glueBack) {
 709                 if ( be->be_entry_open ) {
 710                         rc = be->be_entry_open (be, glueMode);
 711                 }
 712                 if (rc != 0) {
 713                         return NOID;
 714                 }
 715         } else if (be != glueBack) {
 716                 /* If this entry belongs in a different branch than the
 717                  * previous one, close the current database and open the
 718                  * new one.
 719                  */
 720                 if ( glueBack->be_entry_close ) {
 721                         glueBack->be_entry_close (glueBack);
 722                 }
 723                 if ( be->be_entry_open ) {
 724                         rc = be->be_entry_open (be, glueMode);
 725                 }
 726                 if (rc != 0) {
 727                         return NOID;
 728                 }
 729         }
 730         glueBack = be;
 731         return be->be_entry_put (be, e, text);
 732 }
 733
 734 static int
 735 glue_tool_entry_reindex (
 736         BackendDB *b0,
 737         ID id
 738 )
 739 {
 740         if (!glueBack || !glueBack->be_entry_reindex)
 741                 return -1;
 742
 743         return glueBack->be_entry_reindex (glueBack, id);
 744 }
 745
 746 static int
 747 glue_tool_sync (
 748         BackendDB *b0
 749 )
 750 {
 751         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 752         glueinfo                *gi = on->on_bi.bi_private;
 753         BackendInfo             *bi = b0->bd_info;
 754         int i;
 755
 756         /* just sync everyone */
 757         for (i = 0; i<gi->gi_nodes; i++)
 758                 if (gi->gi_n[i].gn_be->be_sync)
 759                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
 760         b0->bd_info = on->on_info->oi_orig;
 761         if ( b0->be_sync )
 762                 b0->be_sync( b0 );
 763         b0->bd_info = bi;
 764         return 0;
 765 }
 766
 767 static int
 768 glue_db_init(
 769         BackendDB *be
 770 )
 771 {
 772         slap_overinst   *on = (slap_overinst *)be->bd_info;
 773         slap_overinfo   *oi = on->on_info;
 774         BackendInfo     *bi = oi->oi_orig;
 775         glueinfo *gi;
 776
 777         gi = ch_calloc( 1, sizeof(glueinfo));
 778         on->on_bi.bi_private = gi;
 779         dnParent( be->be_nsuffix, &gi->gi_pdn );
 780
 781         /* Currently the overlay framework doesn't handle these entry points
 782          * but we need them....
 783          */
 784         oi->oi_bi.bi_open = glue_open;
 785         oi->oi_bi.bi_close = glue_close;
 786
 787         oi->oi_bi.bi_entry_release_rw = glue_entry_release_rw;
 788
 789         /* Only advertise these if the root DB supports them */
 790         if ( bi->bi_tool_entry_open )
 791                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
 792         if ( bi->bi_tool_entry_close )
 793                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
 794         if ( bi->bi_tool_entry_first )
 795                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
 796         if ( bi->bi_tool_entry_next )
 797                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
 798         if ( bi->bi_tool_entry_get )
 799                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
 800         if ( bi->bi_tool_entry_put )
 801                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
 802         if ( bi->bi_tool_entry_reindex )
 803                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
 804         if ( bi->bi_tool_sync )
 805                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
 806
 807         /*FIXME : need to add support */
 808         oi->oi_bi.bi_tool_dn2id_get = 0;
 809         oi->oi_bi.bi_tool_id2entry_get = 0;
 810         oi->oi_bi.bi_tool_entry_modify = 0;
 811
 812         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
 813
 814         return 0;
 815 }
 816
 817 static int
 818 glue_db_destroy (
 819         BackendDB *be
 820 )
 821 {
 822         slap_overinst   *on = (slap_overinst *)be->bd_info;
 823         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 824
 825         free (gi);
 826         return SLAP_CB_CONTINUE;
 827 }
 828
 829 static int
 830 glue_db_close(
 831         BackendDB *be
 832 )
 833 {
 834         slap_overinst   *on = (slap_overinst *)be->bd_info;
 835
 836         on->on_info->oi_bi.bi_db_close = 0;
 837         return 0;
 838 }
 839
 840 int
 841 glue_sub_del( BackendDB *b0 )
 842 {
 843         BackendDB *be;
 844         int rc = 0;
 845
 846         /* Find the top backend for this subordinate */
 847         be = b0;
 848         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 849                 slap_overinfo *oi;
 850                 slap_overinst *on;
 851                 glueinfo *gi;
 852                 int i;
 853
 854                 if ( SLAP_GLUE_SUBORDINATE( be ))
 855                         continue;
 856                 if ( !SLAP_GLUE_INSTANCE( be ))
 857                         continue;
 858                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
 859                         continue;
 860
 861                 /* OK, got the right backend, find the overlay */
 862                 oi = (slap_overinfo *)be->bd_info;
 863                 for ( on=oi->oi_list; on; on=on->on_next ) {
 864                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 865                                 break;
 866                 }
 867                 assert( on != NULL );
 868                 gi = on->on_bi.bi_private;
 869                 for ( i=0; i < gi->gi_nodes; i++ ) {
 870                         if ( gi->gi_n[i].gn_be == b0 ) {
 871                                 int j;
 872
 873                                 for (j=i+1; j < gi->gi_nodes; j++)
 874                                         gi->gi_n[j-1] = gi->gi_n[j];
 875
 876                                 gi->gi_nodes--;
 877                         }
 878                 }
 879         }
 880         if ( be == NULL )
 881                 rc = LDAP_NO_SUCH_OBJECT;
 882
 883         return rc;
 884 }
 885
 886 typedef struct glue_Addrec {
 887         struct glue_Addrec *ga_next;
 888         BackendDB *ga_be;
 889 } glue_Addrec;
 890
 891 /* List of added subordinates */
 892 static glue_Addrec *ga_list;
 893
 894 /* Attach all the subordinate backends to their superior */
 895 int
 896 glue_sub_attach()
 897 {
 898         glue_Addrec *ga, *gnext = NULL;
 899         int rc = 0;
 900
 901         /* For all the subordinate backends */
 902         for ( ga=ga_list; ga != NULL; ga = gnext ) {
 903                 BackendDB *be;
 904
 905                 gnext = ga->ga_next;
 906
 907                 /* Find the top backend for this subordinate */
 908                 be = ga->ga_be;
 909                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 910                         slap_overinfo *oi;
 911                         slap_overinst *on;
 912                         glueinfo *gi;
 913
 914                         if ( SLAP_GLUE_SUBORDINATE( be ))
 915                                 continue;
 916                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
 917                                 continue;
 918
 919                         /* If it's not already configured, set up the overlay */
 920                         if ( !SLAP_GLUE_INSTANCE( be )) {
 921                                 rc = overlay_config( be, glue.on_bi.bi_type );
 922                                 if ( rc )
 923                                         break;
 924                         }
 925                         /* Find the overlay instance */
 926                         oi = (slap_overinfo *)be->bd_info;
 927                         for ( on=oi->oi_list; on; on=on->on_next ) {
 928                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 929                                         break;
 930                         }
 931                         assert( on != NULL );
 932                         gi = on->on_bi.bi_private;
 933                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
 934                                 gi->gi_nodes * sizeof(gluenode));
 935                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
 936                         dnParent( &ga->ga_be->be_nsuffix[0],
 937                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
 938                         gi->gi_nodes++;
 939                         on->on_bi.bi_private = gi;
 940                         break;
 941                 }
 942                 if ( !be ) {
 943                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
 944                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
 945                         rc = LDAP_NO_SUCH_OBJECT;
 946                 }
 947                 ch_free( ga );
 948                 if ( rc ) break;
 949         }
 950
 951         ga_list = gnext;
 952
 953         return rc;
 954 }
 955
 956 int
 957 glue_sub_add( BackendDB *be, int advert, int online )
 958 {
 959         glue_Addrec *ga;
 960         int rc = 0;
 961
 962         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
 963         if ( advert )
 964                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
 965
 966         ga = ch_malloc( sizeof( glue_Addrec ));
 967         ga->ga_next = ga_list;
 968         ga->ga_be = be;
 969         ga_list = ga;
 970
 971         if ( online )
 972                 rc = glue_sub_attach();
 973
 974         return rc;
 975 }
 976
 977 int
 978 glue_sub_init()
 979 {
 980         glue.on_bi.bi_type = "glue";
 981
 982         glue.on_bi.bi_db_init = glue_db_init;
 983         glue.on_bi.bi_db_close = glue_db_close;
 984         glue.on_bi.bi_db_destroy = glue_db_destroy;
 985
 986         glue.on_bi.bi_op_search = glue_op_search;
 987         glue.on_bi.bi_op_modify = glue_op_func;
 988         glue.on_bi.bi_op_modrdn = glue_op_func;
 989         glue.on_bi.bi_op_add = glue_op_func;
 990         glue.on_bi.bi_op_delete = glue_op_func;
 991
 992         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
 993         glue.on_bi.bi_chk_controls = glue_chk_controls;
 994
 995         return overlay_register( &glue );
 996 }