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