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
 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 general 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 (tlimit0 != SLAP_NO_LIMIT) {
 351                                 op->o_time = slap_get_time();
 352                                 op->ors_tlimit = stoptime - op->o_time;
 353                                 if (op->ors_tlimit <= 0) {
 354                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 355                                         break;
 356                                 }
 357                         }
 358                         rs->sr_err = 0;
 359                         /*
 360                          * check for abandon
 361                          */
 362                         if (op->o_abandon) {
 363                                 goto end_of_loop;
 364                         }
 365                         op->o_bd = btmp;
 366
 367                         assert( op->o_bd->be_suffix != NULL );
 368                         assert( op->o_bd->be_nsuffix != NULL );
 369
 370                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 371                                 dn_match(pdn, &ndn))
 372                         {
 373                                 op->ors_scope = LDAP_SCOPE_BASE;
 374                                 op->o_req_dn = op->o_bd->be_suffix[0];
 375                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 376                                 rs->sr_err = op->o_bd->be_search(op, rs);
 377                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 378                                         gs.err = LDAP_SUCCESS;
 379                                 }
 380
 381                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 382                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 383                         {
 384                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 385
 386                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 387                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 388                         {
 389                                 op->o_req_dn = op->o_bd->be_suffix[0];
 390                                 op->o_req_ndn = op->o_bd->be_nsuffix[0];
 391                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 392                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 393                                         gs.err = LDAP_SUCCESS;
 394                                 }
 395                                 op->o_req_dn = dn;
 396                                 op->o_req_ndn = ndn;
 397
 398                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 399                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 400                         }
 401
 402                         switch ( gs.err ) {
 403
 404                         /*
 405                          * Add errors that should result in dropping
 406                          * the search
 407                          */
 408                         case LDAP_SIZELIMIT_EXCEEDED:
 409                         case LDAP_TIMELIMIT_EXCEEDED:
 410                         case LDAP_ADMINLIMIT_EXCEEDED:
 411                         case LDAP_NO_SUCH_OBJECT:
 412 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 413                         case LDAP_X_CANNOT_CHAIN:
 414 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 415                                 goto end_of_loop;
 416
 417                         default:
 418                                 break;
 419                         }
 420                 }
 421 end_of_loop:;
 422                 op->ors_scope = scope0;
 423                 op->ors_tlimit = tlimit0;
 424                 op->o_time = starttime;
 425                 op->o_req_dn = dn;
 426                 op->o_req_ndn = ndn;
 427
 428                 break;
 429         }
 430         if ( op->o_abandon ) {
 431                 rs->sr_err = SLAPD_ABANDON;
 432         } else {
 433                 op->o_callback = cb.sc_next;
 434                 rs->sr_err = gs.err;
 435                 rs->sr_matched = gs.matched;
 436                 rs->sr_ref = gs.refs;
 437                 rs->sr_ctrls = gs.ctrls;
 438
 439                 send_ldap_result( op, rs );
 440         }
 441
 442         op->o_bd = b0;
 443         op->o_bd->bd_info = bi0;
 444         if (gs.matched)
 445                 free (gs.matched);
 446         if (gs.refs)
 447                 ber_bvarray_free(gs.refs);
 448         if (gs.ctrls) {
 449                 for (i = gs.nctrls; --i >= 0; ) {
 450                         if (!BER_BVISNULL( &gs.ctrls[i]->ldctl_value ))
 451                                 free(gs.ctrls[i]->ldctl_value.bv_val);
 452                         free(gs.ctrls[i]);
 453                 }
 454                 free(gs.ctrls);
 455         }
 456         return rs->sr_err;
 457 }
 458
 459 static BackendDB toolDB;
 460
 461 static int
 462 glue_tool_entry_open (
 463         BackendDB *b0,
 464         int mode
 465 )
 466 {
 467         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 468
 469         /* We don't know which backend to talk to yet, so just
 470          * remember the mode and move on...
 471          */
 472
 473         glueMode = mode;
 474         glueBack = NULL;
 475         toolDB = *b0;
 476         toolDB.bd_info = oi->oi_orig;
 477
 478         return 0;
 479 }
 480
 481 static int
 482 glue_tool_entry_close (
 483         BackendDB *b0
 484 )
 485 {
 486         int rc = 0;
 487
 488         if (glueBack) {
 489                 if (!glueBack->be_entry_close)
 490                         return 0;
 491                 rc = glueBack->be_entry_close (glueBack);
 492         }
 493         return rc;
 494 }
 495
 496 static slap_overinst *
 497 glue_tool_inst(
 498         BackendInfo *bi
 499 )
 500 {
 501         slap_overinfo   *oi = (slap_overinfo *)bi;
 502         slap_overinst   *on;
 503
 504         for ( on = oi->oi_list; on; on=on->on_next ) {
 505                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 506                         return on;
 507         }
 508         return NULL;
 509 }
 510
 511 /* This function will only be called in tool mode */
 512 static int
 513 glue_open (
 514         BackendInfo *bi
 515 )
 516 {
 517         slap_overinst *on = glue_tool_inst( bi );
 518         glueinfo                *gi = on->on_bi.bi_private;
 519         static int glueOpened = 0;
 520         int i, j, same, bsame = 0, rc = 0;
 521
 522         if (glueOpened) return 0;
 523
 524         glueOpened = 1;
 525
 526         /* If we were invoked in tool mode, open all the underlying backends */
 527         if (slapMode & SLAP_TOOL_MODE) {
 528                 for (i = 0; i<gi->gi_nodes; i++) {
 529                         same = 0;
 530                         /* Same bi_open as our main backend? */
 531                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 532                                 on->on_info->oi_orig->bi_open )
 533                                 bsame = 1;
 534
 535                         /* Loop thru the bd_info's and make sure we only
 536                          * invoke their bi_open functions once each.
 537                          */
 538                         for ( j = 0; j<i; j++ ) {
 539                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 540                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 541                                         same = 1;
 542                                         break;
 543                                 }
 544                         }
 545                         /* OK, it's unique and non-NULL, call it. */
 546                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 547                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 548                                         gi->gi_n[i].gn_be->bd_info );
 549                         /* Let backend.c take care of the rest of startup */
 550                         if ( !rc )
 551                                 rc = backend_startup_one( gi->gi_n[i].gn_be );
 552                         if ( rc ) break;
 553                 }
 554                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 555                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 556
 557         } /* other case is impossible */
 558         return rc;
 559 }
 560
 561 /* This function will only be called in tool mode */
 562 static int
 563 glue_close (
 564         BackendInfo *bi
 565 )
 566 {
 567         static int glueClosed = 0;
 568         int rc = 0;
 569
 570         if (glueClosed) return 0;
 571
 572         glueClosed = 1;
 573
 574         if (slapMode & SLAP_TOOL_MODE) {
 575                 rc = backend_shutdown( NULL );
 576         }
 577         return rc;
 578 }
 579
 580 static int
 581 glue_entry_release_rw (
 582         Operation *op,
 583         Entry *e,
 584         int rw
 585 )
 586 {
 587         BackendDB *b0, b2;
 588         int rc = -1;
 589
 590         b0 = op->o_bd;
 591         b2 = *op->o_bd;
 592         b2.bd_info = (BackendInfo *)glue_tool_inst( op->o_bd->bd_info );
 593         op->o_bd = glue_back_select (&b2, &e->e_nname);
 594
 595         if ( op->o_bd->be_release ) {
 596                 rc = op->o_bd->be_release( op, e, rw );
 597
 598         } else {
 599                 /* FIXME: mimic be_entry_release_rw
 600                  * when no be_release() available */
 601                 /* free entry */
 602                 entry_free( e );
 603                 rc = 0;
 604         }
 605         op->o_bd = b0;
 606         return rc;
 607 }
 608
 609 static ID
 610 glue_tool_entry_first (
 611         BackendDB *b0
 612 )
 613 {
 614         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 615         glueinfo                *gi = on->on_bi.bi_private;
 616         int i;
 617
 618         /* If we're starting from scratch, start at the most general */
 619         if (!glueBack) {
 620                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 621                         glueBack = &toolDB;
 622                 } else {
 623                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 624                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 625                                         gi->gi_n[i].gn_be->be_entry_first) {
 626                                                 glueBack = gi->gi_n[i].gn_be;
 627                                         break;
 628                                 }
 629                         }
 630                 }
 631         }
 632         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 633                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 634                 return NOID;
 635
 636         return glueBack->be_entry_first (glueBack);
 637 }
 638
 639 static ID
 640 glue_tool_entry_next (
 641         BackendDB *b0
 642 )
 643 {
 644         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 645         glueinfo                *gi = on->on_bi.bi_private;
 646         int i;
 647         ID rc;
 648
 649         if (!glueBack || !glueBack->be_entry_next)
 650                 return NOID;
 651
 652         rc = glueBack->be_entry_next (glueBack);
 653
 654         /* If we ran out of entries in one database, move on to the next */
 655         while (rc == NOID) {
 656                 if ( glueBack && glueBack->be_entry_close )
 657                         glueBack->be_entry_close (glueBack);
 658                 for (i=0; i<gi->gi_nodes; i++) {
 659                         if (gi->gi_n[i].gn_be == glueBack)
 660                                 break;
 661                 }
 662                 if (i == 0) {
 663                         glueBack = NULL;
 664                         break;
 665                 } else {
 666                         glueBack = gi->gi_n[i-1].gn_be;
 667                         rc = glue_tool_entry_first (b0);
 668                 }
 669         }
 670         return rc;
 671 }
 672
 673 static Entry *
 674 glue_tool_entry_get (
 675         BackendDB *b0,
 676         ID id
 677 )
 678 {
 679         if (!glueBack || !glueBack->be_entry_get)
 680                 return NULL;
 681
 682         return glueBack->be_entry_get (glueBack, id);
 683 }
 684
 685 static ID
 686 glue_tool_entry_put (
 687         BackendDB *b0,
 688         Entry *e,
 689         struct berval *text
 690 )
 691 {
 692         BackendDB *be, b2;
 693         int rc = -1;
 694
 695         b2 = *b0;
 696         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 697         be = glue_back_select (&b2, &e->e_nname);
 698         if ( be == &b2 ) be = &toolDB;
 699
 700         if (!be->be_entry_put)
 701                 return NOID;
 702
 703         if (!glueBack) {
 704                 if ( be->be_entry_open ) {
 705                         rc = be->be_entry_open (be, glueMode);
 706                 }
 707                 if (rc != 0) {
 708                         return NOID;
 709                 }
 710         } else if (be != glueBack) {
 711                 /* If this entry belongs in a different branch than the
 712                  * previous one, close the current database and open the
 713                  * new one.
 714                  */
 715                 if ( glueBack->be_entry_close ) {
 716                         glueBack->be_entry_close (glueBack);
 717                 }
 718                 if ( be->be_entry_open ) {
 719                         rc = be->be_entry_open (be, glueMode);
 720                 }
 721                 if (rc != 0) {
 722                         return NOID;
 723                 }
 724         }
 725         glueBack = be;
 726         return be->be_entry_put (be, e, text);
 727 }
 728
 729 static int
 730 glue_tool_entry_reindex (
 731         BackendDB *b0,
 732         ID id
 733 )
 734 {
 735         if (!glueBack || !glueBack->be_entry_reindex)
 736                 return -1;
 737
 738         return glueBack->be_entry_reindex (glueBack, id);
 739 }
 740
 741 static int
 742 glue_tool_sync (
 743         BackendDB *b0
 744 )
 745 {
 746         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 747         glueinfo                *gi = on->on_bi.bi_private;
 748         BackendInfo             *bi = b0->bd_info;
 749         int i;
 750
 751         /* just sync everyone */
 752         for (i = 0; i<gi->gi_nodes; i++)
 753                 if (gi->gi_n[i].gn_be->be_sync)
 754                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
 755         b0->bd_info = on->on_info->oi_orig;
 756         if ( b0->be_sync )
 757                 b0->be_sync( b0 );
 758         b0->bd_info = bi;
 759         return 0;
 760 }
 761
 762 static int
 763 glue_db_init(
 764         BackendDB *be
 765 )
 766 {
 767         slap_overinst   *on = (slap_overinst *)be->bd_info;
 768         slap_overinfo   *oi = on->on_info;
 769         BackendInfo     *bi = oi->oi_orig;
 770         glueinfo *gi;
 771
 772         gi = ch_calloc( 1, sizeof(glueinfo));
 773         on->on_bi.bi_private = gi;
 774         dnParent( be->be_nsuffix, &gi->gi_pdn );
 775
 776         /* Currently the overlay framework doesn't handle these entry points
 777          * but we need them....
 778          */
 779         oi->oi_bi.bi_open = glue_open;
 780         oi->oi_bi.bi_close = glue_close;
 781
 782         oi->oi_bi.bi_entry_release_rw = glue_entry_release_rw;
 783
 784         /* Only advertise these if the root DB supports them */
 785         if ( bi->bi_tool_entry_open )
 786                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
 787         if ( bi->bi_tool_entry_close )
 788                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
 789         if ( bi->bi_tool_entry_first )
 790                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
 791         if ( bi->bi_tool_entry_next )
 792                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
 793         if ( bi->bi_tool_entry_get )
 794                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
 795         if ( bi->bi_tool_entry_put )
 796                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
 797         if ( bi->bi_tool_entry_reindex )
 798                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
 799         if ( bi->bi_tool_sync )
 800                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
 801
 802         /*FIXME : need to add support */
 803         oi->oi_bi.bi_tool_dn2id_get = 0;
 804         oi->oi_bi.bi_tool_id2entry_get = 0;
 805         oi->oi_bi.bi_tool_entry_modify = 0;
 806
 807         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
 808
 809         return 0;
 810 }
 811
 812 static int
 813 glue_db_destroy (
 814         BackendDB *be
 815 )
 816 {
 817         slap_overinst   *on = (slap_overinst *)be->bd_info;
 818         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 819
 820         free (gi);
 821         return SLAP_CB_CONTINUE;
 822 }
 823
 824 static int
 825 glue_db_close(
 826         BackendDB *be
 827 )
 828 {
 829         slap_overinst   *on = (slap_overinst *)be->bd_info;
 830
 831         on->on_info->oi_bi.bi_db_close = 0;
 832         return 0;
 833 }
 834
 835 int
 836 glue_sub_del( BackendDB *b0 )
 837 {
 838         BackendDB *be;
 839         int rc = 0;
 840
 841         /* Find the top backend for this subordinate */
 842         be = b0;
 843         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 844                 slap_overinfo *oi;
 845                 slap_overinst *on;
 846                 glueinfo *gi;
 847                 int i;
 848
 849                 if ( SLAP_GLUE_SUBORDINATE( be ))
 850                         continue;
 851                 if ( !SLAP_GLUE_INSTANCE( be ))
 852                         continue;
 853                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
 854                         continue;
 855
 856                 /* OK, got the right backend, find the overlay */
 857                 oi = (slap_overinfo *)be->bd_info;
 858                 for ( on=oi->oi_list; on; on=on->on_next ) {
 859                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 860                                 break;
 861                 }
 862                 assert( on != NULL );
 863                 gi = on->on_bi.bi_private;
 864                 for ( i=0; i < gi->gi_nodes; i++ ) {
 865                         if ( gi->gi_n[i].gn_be == b0 ) {
 866                                 int j;
 867
 868                                 for (j=i+1; j < gi->gi_nodes; j++)
 869                                         gi->gi_n[j-1] = gi->gi_n[j];
 870
 871                                 gi->gi_nodes--;
 872                         }
 873                 }
 874         }
 875         if ( be == NULL )
 876                 rc = LDAP_NO_SUCH_OBJECT;
 877
 878         return rc;
 879 }
 880
 881 typedef struct glue_Addrec {
 882         struct glue_Addrec *ga_next;
 883         BackendDB *ga_be;
 884 } glue_Addrec;
 885
 886 /* List of added subordinates */
 887 static glue_Addrec *ga_list;
 888
 889 /* Attach all the subordinate backends to their superior */
 890 int
 891 glue_sub_attach()
 892 {
 893         glue_Addrec *ga, *gnext = NULL;
 894         int rc = 0;
 895
 896         /* For all the subordinate backends */
 897         for ( ga=ga_list; ga != NULL; ga = gnext ) {
 898                 BackendDB *be;
 899
 900                 gnext = ga->ga_next;
 901
 902                 /* Find the top backend for this subordinate */
 903                 be = ga->ga_be;
 904                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
 905                         slap_overinfo *oi;
 906                         slap_overinst *on;
 907                         glueinfo *gi;
 908
 909                         if ( SLAP_GLUE_SUBORDINATE( be ))
 910                                 continue;
 911                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
 912                                 continue;
 913
 914                         /* If it's not already configured, set up the overlay */
 915                         if ( !SLAP_GLUE_INSTANCE( be )) {
 916                                 rc = overlay_config( be, glue.on_bi.bi_type );
 917                                 if ( rc )
 918                                         break;
 919                         }
 920                         /* Find the overlay instance */
 921                         oi = (slap_overinfo *)be->bd_info;
 922                         for ( on=oi->oi_list; on; on=on->on_next ) {
 923                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
 924                                         break;
 925                         }
 926                         assert( on != NULL );
 927                         gi = on->on_bi.bi_private;
 928                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
 929                                 gi->gi_nodes * sizeof(gluenode));
 930                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
 931                         dnParent( &ga->ga_be->be_nsuffix[0],
 932                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
 933                         gi->gi_nodes++;
 934                         on->on_bi.bi_private = gi;
 935                         break;
 936                 }
 937                 if ( !be ) {
 938                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
 939                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
 940                         rc = LDAP_NO_SUCH_OBJECT;
 941                 }
 942                 ch_free( ga );
 943                 if ( rc ) break;
 944         }
 945
 946         ga_list = gnext;
 947
 948         return rc;
 949 }
 950
 951 int
 952 glue_sub_add( BackendDB *be, int advert, int online )
 953 {
 954         glue_Addrec *ga;
 955         int rc = 0;
 956
 957         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
 958         if ( advert )
 959                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
 960
 961         ga = ch_malloc( sizeof( glue_Addrec ));
 962         ga->ga_next = ga_list;
 963         ga->ga_be = be;
 964         ga_list = ga;
 965
 966         if ( online )
 967                 rc = glue_sub_attach();
 968
 969         return rc;
 970 }
 971
 972 int
 973 glue_sub_init()
 974 {
 975         glue.on_bi.bi_type = "glue";
 976
 977         glue.on_bi.bi_db_init = glue_db_init;
 978         glue.on_bi.bi_db_close = glue_db_close;
 979         glue.on_bi.bi_db_destroy = glue_db_destroy;
 980
 981         glue.on_bi.bi_op_search = glue_op_search;
 982         glue.on_bi.bi_op_modify = glue_op_func;
 983         glue.on_bi.bi_op_modrdn = glue_op_func;
 984         glue.on_bi.bi_op_add = glue_op_func;
 985         glue.on_bi.bi_op_delete = glue_op_func;
 986
 987         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
 988         glue.on_bi.bi_chk_controls = glue_chk_controls;
 989
 990         return overlay_register( &glue );
 991 }