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 2001-2009 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 #include "lutil.h"
  39 #include "config.h"
  40
  41 typedef struct gluenode {
  42         BackendDB *gn_be;
  43         struct berval gn_pdn;
  44 } gluenode;
  45
  46 typedef struct glueinfo {
  47         int gi_nodes;
  48         struct berval gi_pdn;
  49         gluenode gi_n[1];
  50 } glueinfo;
  51
  52 static slap_overinst    glue;
  53
  54 static int glueMode;
  55 static BackendDB *glueBack;
  56 static BackendDB glueBackDone;
  57 #define GLUEBACK_DONE (&glueBackDone)
  58
  59 static slap_overinst * glue_tool_inst( BackendInfo *bi);
  60
  61 static slap_response glue_op_response;
  62
  63 /* Just like select_backend, but only for our backends */
  64 static BackendDB *
  65 glue_back_select (
  66         BackendDB *be,
  67         struct berval *dn
  68 )
  69 {
  70         slap_overinst   *on = (slap_overinst *)be->bd_info;
  71         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
  72         int i;
  73
  74         for (i = gi->gi_nodes-1; i >= 0; i--) {
  75                 assert( gi->gi_n[i].gn_be->be_nsuffix != NULL );
  76
  77                 if (dnIsSuffix(dn, &gi->gi_n[i].gn_be->be_nsuffix[0])) {
  78                         return gi->gi_n[i].gn_be;
  79                 }
  80         }
  81         be->bd_info = on->on_info->oi_orig;
  82         return be;
  83 }
  84
  85
  86 typedef struct glue_state {
  87         char *matched;
  88         BerVarray refs;
  89         LDAPControl **ctrls;
  90         int err;
  91         int matchlen;
  92         int nrefs;
  93         int nctrls;
  94 } glue_state;
  95
  96 static int
  97 glue_op_cleanup( Operation *op, SlapReply *rs )
  98 {
  99         /* This is not a final result */
 100         if (rs->sr_type == REP_RESULT )
 101                 rs->sr_type = REP_GLUE_RESULT;
 102         return SLAP_CB_CONTINUE;
 103 }
 104
 105 static int
 106 glue_op_response ( Operation *op, SlapReply *rs )
 107 {
 108         glue_state *gs = op->o_callback->sc_private;
 109
 110         switch(rs->sr_type) {
 111         case REP_SEARCH:
 112         case REP_SEARCHREF:
 113         case REP_INTERMEDIATE:
 114                 return SLAP_CB_CONTINUE;
 115
 116         default:
 117                 if (rs->sr_err == LDAP_SUCCESS ||
 118                         rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ||
 119                         rs->sr_err == LDAP_TIMELIMIT_EXCEEDED ||
 120                         rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 121                         rs->sr_err == LDAP_NO_SUCH_OBJECT ||
 122                         gs->err != LDAP_SUCCESS)
 123                         gs->err = rs->sr_err;
 124                 if (gs->err == LDAP_SUCCESS && gs->matched) {
 125                         ch_free (gs->matched);
 126                         gs->matched = NULL;
 127                         gs->matchlen = 0;
 128                 }
 129                 if (gs->err != LDAP_SUCCESS && rs->sr_matched) {
 130                         int len;
 131                         len = strlen (rs->sr_matched);
 132                         if (len > gs->matchlen) {
 133                                 if (gs->matched)
 134                                         ch_free (gs->matched);
 135                                 gs->matched = ch_strdup (rs->sr_matched);
 136                                 gs->matchlen = len;
 137                         }
 138                 }
 139                 if (rs->sr_ref) {
 140                         int i, j, k;
 141                         BerVarray new;
 142
 143                         for (i=0; rs->sr_ref[i].bv_val; i++);
 144
 145                         j = gs->nrefs;
 146                         if (!j) {
 147                                 new = ch_malloc ((i+1)*sizeof(struct berval));
 148                         } else {
 149                                 new = ch_realloc(gs->refs,
 150                                         (j+i+1)*sizeof(struct berval));
 151                         }
 152                         for (k=0; k<i; j++,k++) {
 153                                 ber_dupbv( &new[j], &rs->sr_ref[k] );
 154                         }
 155                         new[j].bv_val = NULL;
 156                         gs->nrefs = j;
 157                         gs->refs = new;
 158                 }
 159                 if (rs->sr_ctrls) {
 160                         int i, j, k;
 161                         LDAPControl **newctrls;
 162
 163                         for (i=0; rs->sr_ctrls[i]; i++);
 164
 165                         j = gs->nctrls;
 166                         if (!j) {
 167                                 newctrls = op->o_tmpalloc((i+1)*sizeof(LDAPControl *),
 168                                         op->o_tmpmemctx);
 169                         } else {
 170                                 /* Forget old pagedResults response if we're sending
 171                                  * a new one now
 172                                  */
 173                                 if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 174                                         int newpage = 0;
 175                                         for ( k=0; k<i; k++ ) {
 176                                                 if ( !strcmp(rs->sr_ctrls[k]->ldctl_oid,
 177                                                         LDAP_CONTROL_PAGEDRESULTS )) {
 178                                                         newpage = 1;
 179                                                         break;
 180                                                 }
 181                                         }
 182                                         if ( newpage ) {
 183                                                 for ( k=0; k<j; k++ ) {
 184                                                         if ( !strcmp(gs->ctrls[k]->ldctl_oid,
 185                                                                 LDAP_CONTROL_PAGEDRESULTS ))
 186                                                         {
 187                                                                 op->o_tmpfree(gs->ctrls[k], op->o_tmpmemctx);
 188                                                                 gs->ctrls[k] = gs->ctrls[--j];
 189                                                                 gs->ctrls[j] = NULL;
 190                                                                 break;
 191                                                         }
 192                                                 }
 193                                         }
 194                                 }
 195                                 newctrls = op->o_tmprealloc(gs->ctrls,
 196                                         (j+i+1)*sizeof(LDAPControl *), op->o_tmpmemctx);
 197                         }
 198                         for (k=0; k<i; j++,k++) {
 199                                 ber_len_t oidlen = strlen( rs->sr_ctrls[k]->ldctl_oid );
 200                                 newctrls[j] = op->o_tmpalloc(sizeof(LDAPControl) + oidlen + 1 + rs->sr_ctrls[k]->ldctl_value.bv_len + 1,
 201                                         op->o_tmpmemctx);
 202                                 newctrls[j]->ldctl_iscritical = rs->sr_ctrls[k]->ldctl_iscritical;
 203                                 newctrls[j]->ldctl_oid = (char *)&newctrls[j][1];
 204                                 lutil_strcopy( newctrls[j]->ldctl_oid, rs->sr_ctrls[k]->ldctl_oid );
 205                                 if ( !BER_BVISNULL( &rs->sr_ctrls[k]->ldctl_value ) ) {
 206                                         newctrls[j]->ldctl_value.bv_val = &newctrls[j]->ldctl_oid[oidlen + 1];
 207                                         newctrls[j]->ldctl_value.bv_len = rs->sr_ctrls[k]->ldctl_value.bv_len;
 208                                         lutil_memcopy( newctrls[j]->ldctl_value.bv_val,
 209                                                 rs->sr_ctrls[k]->ldctl_value.bv_val,
 210                                                 rs->sr_ctrls[k]->ldctl_value.bv_len + 1 );
 211                                 } else {
 212                                         BER_BVZERO( &newctrls[j]->ldctl_value );
 213                                 }
 214                         }
 215                         newctrls[j] = NULL;
 216                         gs->nctrls = j;
 217                         gs->ctrls = newctrls;
 218                 }
 219         }
 220         return 0;
 221 }
 222
 223 static int
 224 glue_op_func ( Operation *op, SlapReply *rs )
 225 {
 226         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 227         BackendDB *b0 = op->o_bd;
 228         BackendInfo *bi0 = op->o_bd->bd_info;
 229         BI_op_modify **func;
 230         slap_operation_t which = op_bind;
 231         int rc;
 232
 233         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 234
 235         /* If we're on the master backend, let overlay framework handle it */
 236         if ( op->o_bd == b0 )
 237                 return SLAP_CB_CONTINUE;
 238
 239         b0->bd_info = on->on_info->oi_orig;
 240
 241         switch(op->o_tag) {
 242         case LDAP_REQ_ADD: which = op_add; break;
 243         case LDAP_REQ_DELETE: which = op_delete; break;
 244         case LDAP_REQ_MODIFY: which = op_modify; break;
 245         case LDAP_REQ_MODRDN: which = op_modrdn; break;
 246         case LDAP_REQ_EXTENDED: which = op_extended; break;
 247         default: assert( 0 ); break;
 248         }
 249
 250         func = &op->o_bd->bd_info->bi_op_bind;
 251         if ( func[which] )
 252                 rc = func[which]( op, rs );
 253         else
 254                 rc = SLAP_CB_BYPASS;
 255
 256         op->o_bd = b0;
 257         op->o_bd->bd_info = bi0;
 258         return rc;
 259 }
 260
 261 static int
 262 glue_response ( Operation *op, SlapReply *rs )
 263 {
 264         BackendDB *be = op->o_bd;
 265         be = glue_back_select (op->o_bd, &op->o_req_ndn);
 266
 267         /* If we're on the master backend, let overlay framework handle it.
 268          * Otherwise, bail out.
 269          */
 270         return ( op->o_bd == be ) ? SLAP_CB_CONTINUE : SLAP_CB_BYPASS;
 271 }
 272
 273 static int
 274 glue_chk_referrals ( Operation *op, SlapReply *rs )
 275 {
 276         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 277         BackendDB *b0 = op->o_bd;
 278         BackendInfo *bi0 = op->o_bd->bd_info;
 279         int rc;
 280
 281         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 282         if ( op->o_bd == b0 )
 283                 return SLAP_CB_CONTINUE;
 284
 285         b0->bd_info = on->on_info->oi_orig;
 286
 287         if ( op->o_bd->bd_info->bi_chk_referrals )
 288                 rc = ( *op->o_bd->bd_info->bi_chk_referrals )( op, rs );
 289         else
 290                 rc = SLAP_CB_CONTINUE;
 291
 292         op->o_bd = b0;
 293         op->o_bd->bd_info = bi0;
 294         return rc;
 295 }
 296
 297 static int
 298 glue_chk_controls ( Operation *op, SlapReply *rs )
 299 {
 300         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 301         BackendDB *b0 = op->o_bd;
 302         BackendInfo *bi0 = op->o_bd->bd_info;
 303         int rc = SLAP_CB_CONTINUE;
 304
 305         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 306         if ( op->o_bd == b0 )
 307                 return SLAP_CB_CONTINUE;
 308
 309         b0->bd_info = on->on_info->oi_orig;
 310
 311         /* if the subordinate database has overlays, the bi_chk_controls()
 312          * hook is actually over_aux_chk_controls(); in case it actually
 313          * wraps a missing hok, we need to mimic the behavior
 314          * of the frontend applied to that database */
 315         if ( op->o_bd->bd_info->bi_chk_controls ) {
 316                 rc = ( *op->o_bd->bd_info->bi_chk_controls )( op, rs );
 317         }
 318
 319
 320         if ( rc == SLAP_CB_CONTINUE ) {
 321                 rc = backend_check_controls( op, rs );
 322         }
 323
 324         op->o_bd = b0;
 325         op->o_bd->bd_info = bi0;
 326         return rc;
 327 }
 328
 329 /* ITS#4615 - overlays configured above the glue overlay should be
 330  * invoked for the entire glued tree. Overlays configured below the
 331  * glue overlay should only be invoked on the master backend.
 332  * So, if we're searching on any subordinates, we need to force the
 333  * current overlay chain to stop processing, without stopping the
 334  * overall callback flow.
 335  */
 336 static int
 337 glue_sub_search( Operation *op, SlapReply *rs, BackendDB *b0,
 338         slap_overinst *on )
 339 {
 340         /* Process any overlays on the master backend */
 341         if ( op->o_bd == b0 && on->on_next ) {
 342                 BackendInfo *bi = op->o_bd->bd_info;
 343                 int rc = SLAP_CB_CONTINUE;
 344                 for ( on=on->on_next; on; on=on->on_next ) {
 345                         op->o_bd->bd_info = (BackendInfo *)on;
 346                         if ( on->on_bi.bi_op_search ) {
 347                                 rc = on->on_bi.bi_op_search( op, rs );
 348                                 if ( rc != SLAP_CB_CONTINUE )
 349                                         break;
 350                         }
 351                 }
 352                 op->o_bd->bd_info = bi;
 353                 if ( rc != SLAP_CB_CONTINUE )
 354                         return rc;
 355         }
 356         return op->o_bd->be_search( op, rs );
 357 }
 358
 359 static int
 360 glue_op_search ( Operation *op, SlapReply *rs )
 361 {
 362         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 363         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 364         BackendDB *b0 = op->o_bd;
 365         BackendDB *b1 = NULL, *btmp;
 366         BackendInfo *bi0 = op->o_bd->bd_info;
 367         int i;
 368         long stoptime = 0, starttime;
 369         glue_state gs = {NULL, NULL, NULL, 0, 0, 0, 0};
 370         slap_callback cb = { NULL, glue_op_response, glue_op_cleanup, NULL };
 371         int scope0, tlimit0;
 372         struct berval dn, ndn, *pdn;
 373
 374         cb.sc_private = &gs;
 375
 376         cb.sc_next = op->o_callback;
 377
 378         starttime = op->o_time;
 379         stoptime = slap_get_time () + op->ors_tlimit;
 380
 381         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 382         b0->bd_info = on->on_info->oi_orig;
 383
 384         switch (op->ors_scope) {
 385         case LDAP_SCOPE_BASE:
 386                 if ( op->o_bd == b0 )
 387                         return SLAP_CB_CONTINUE;
 388
 389                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 390                 if (op->o_bd && op->o_bd->be_search) {
 391                         rs->sr_err = op->o_bd->be_search( op, rs );
 392                 }
 393                 return rs->sr_err;
 394
 395         case LDAP_SCOPE_ONELEVEL:
 396         case LDAP_SCOPE_SUBTREE:
 397         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 398                 op->o_callback = &cb;
 399                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 400                 scope0 = op->ors_scope;
 401                 tlimit0 = op->ors_tlimit;
 402                 dn = op->o_req_dn;
 403                 ndn = op->o_req_ndn;
 404                 b1 = op->o_bd;
 405
 406                 /*
 407                  * Execute in reverse order, most specific first
 408                  */
 409                 for (i = gi->gi_nodes; i >= 0; i--) {
 410                         if ( i == gi->gi_nodes ) {
 411                                 btmp = b0;
 412                                 pdn = &gi->gi_pdn;
 413                         } else {
 414                                 btmp = gi->gi_n[i].gn_be;
 415                                 pdn = &gi->gi_n[i].gn_pdn;
 416                         }
 417                         if (!btmp || !btmp->be_search)
 418                                 continue;
 419                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 420                                 continue;
 421                         if (get_no_subordinate_glue(op) && btmp != b1)
 422                                 continue;
 423                         /* If we remembered which backend we were on before,
 424                          * skip down to it now
 425                          */
 426                         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED &&
 427                                 op->o_conn->c_pagedresults_state.ps_be &&
 428                                 op->o_conn->c_pagedresults_state.ps_be != btmp )
 429                                 continue;
 430
 431                         if (tlimit0 != SLAP_NO_LIMIT) {
 432                                 op->o_time = slap_get_time();
 433                                 op->ors_tlimit = stoptime - op->o_time;
 434                                 if (op->ors_tlimit <= 0) {
 435                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 436                                         break;
 437                                 }
 438                         }
 439                         rs->sr_err = 0;
 440                         /*
 441                          * check for abandon
 442                          */
 443                         if (op->o_abandon) {
 444                                 goto end_of_loop;
 445                         }
 446                         op->o_bd = btmp;
 447
 448                         assert( op->o_bd->be_suffix != NULL );
 449                         assert( op->o_bd->be_nsuffix != NULL );
 450
 451                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 452                                 dn_match(pdn, &ndn))
 453                         {
 454                                 struct berval mdn, mndn;
 455                                 op->ors_scope = LDAP_SCOPE_BASE;
 456                                 mdn = op->o_req_dn = op->o_bd->be_suffix[0];
 457                                 mndn = op->o_req_ndn = op->o_bd->be_nsuffix[0];
 458                                 rs->sr_err = op->o_bd->be_search(op, rs);
 459                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 460                                         gs.err = LDAP_SUCCESS;
 461                                 }
 462                                 op->ors_scope = LDAP_SCOPE_ONELEVEL;
 463                                 if ( op->o_req_dn.bv_val == mdn.bv_val )
 464                                         op->o_req_dn = dn;
 465                                 if ( op->o_req_ndn.bv_val == mndn.bv_val )
 466                                         op->o_req_ndn = ndn;
 467
 468                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 469                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 470                         {
 471                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 472
 473                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 474                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 475                         {
 476                                 struct berval mdn, mndn;
 477                                 mdn = op->o_req_dn = op->o_bd->be_suffix[0];
 478                                 mndn = op->o_req_ndn = op->o_bd->be_nsuffix[0];
 479                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 480                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 481                                         gs.err = LDAP_SUCCESS;
 482                                 }
 483                                 if ( op->o_req_dn.bv_val == mdn.bv_val )
 484                                         op->o_req_dn = dn;
 485                                 if ( op->o_req_ndn.bv_val == mndn.bv_val )
 486                                         op->o_req_ndn = ndn;
 487
 488                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 489                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 490                         }
 491
 492                         switch ( gs.err ) {
 493
 494                         /*
 495                          * Add errors that should result in dropping
 496                          * the search
 497                          */
 498                         case LDAP_SIZELIMIT_EXCEEDED:
 499                         case LDAP_TIMELIMIT_EXCEEDED:
 500                         case LDAP_ADMINLIMIT_EXCEEDED:
 501                         case LDAP_NO_SUCH_OBJECT:
 502 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 503                         case LDAP_X_CANNOT_CHAIN:
 504 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 505                                 goto end_of_loop;
 506
 507                         case LDAP_SUCCESS:
 508                                 if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 509                                         PagedResultsState *ps = op->o_pagedresults_state;
 510
 511                                         /* Assume this backend can be forgotten now */
 512                                         op->o_conn->c_pagedresults_state.ps_be = NULL;
 513
 514                                         /* If we have a full page, exit the loop. We may
 515                                          * need to remember this backend so we can continue
 516                                          * from here on a subsequent request.
 517                                          */
 518                                         if ( rs->sr_nentries >= ps->ps_size ) {
 519                                                 /* Don't bother to remember the first backend.
 520                                                  * Only remember the last one if there's more state left.
 521                                                  */
 522                                                 if ( op->o_bd != b0 &&
 523                                                         ( op->o_conn->c_pagedresults_state.ps_cookie ||
 524                                                         op->o_bd != gi->gi_n[0].gn_be ))
 525                                                         op->o_conn->c_pagedresults_state.ps_be = op->o_bd;
 526                                                 goto end_of_loop;
 527                                         }
 528
 529                                         /* This backend has run out of entries, but more responses
 530                                          * can fit in the page. Fake a reset of the state so the
 531                                          * next backend will start up properly. Only back-[bh]db
 532                                          * and back-sql look at this state info.
 533                                          */
 534                                         if ( ps->ps_cookieval.bv_len == sizeof( PagedResultsCookie )) {
 535                                                 ps->ps_cookie = 0;
 536                                                 memset( ps->ps_cookieval.bv_val, 0,
 537                                                         sizeof( PagedResultsCookie ));
 538                                         }
 539
 540
 541                                         {
 542                                                 /* change the size of the page in the request
 543                                                  * that will be propagated */
 544                                                 BerElementBuffer berbuf;
 545                                                 BerElement *ber = (BerElement *)&berbuf;
 546                                                 int size = ps->ps_size - rs->sr_nentries;
 547                                                 struct berval cookie = BER_BVC(""), value;
 548                                                 int c;
 549
 550                                                 for (c = 0; op->o_ctrls[c] != NULL; c++) {
 551                                                         if (strcmp(op->o_ctrls[c]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS) == 0)
 552                                                                 break;
 553                                                 }
 554
 555                                                 ber_init2( ber, NULL, LBER_USE_DER );
 556                                                 ber_printf( ber, "{iO}", size, &cookie );
 557                                                 ber_flatten2( ber, &value, 0 );
 558                                                 assert( op->o_ctrls[c]->ldctl_value.bv_len >= value.bv_len );
 559                                                 op->o_ctrls[c]->ldctl_value.bv_len = value.bv_len;
 560                                                 lutil_memcopy( op->o_ctrls[c]->ldctl_value.bv_val,
 561                                                         value.bv_val, value.bv_len );
 562                                                 ber_free_buf( ber );
 563                                         }
 564                                 }
 565
 566                         default:
 567                                 break;
 568                         }
 569                 }
 570 end_of_loop:;
 571                 op->ors_scope = scope0;
 572                 op->ors_tlimit = tlimit0;
 573                 op->o_time = starttime;
 574
 575                 break;
 576         }
 577
 578         op->o_callback = cb.sc_next;
 579         if ( op->o_abandon ) {
 580                 rs->sr_err = SLAPD_ABANDON;
 581         } else {
 582                 rs->sr_err = gs.err;
 583                 rs->sr_matched = gs.matched;
 584                 rs->sr_ref = gs.refs;
 585         }
 586         rs->sr_ctrls = gs.ctrls;
 587
 588         send_ldap_result( op, rs );
 589
 590         op->o_bd = b0;
 591         op->o_bd->bd_info = bi0;
 592         if (gs.matched)
 593                 free (gs.matched);
 594         if (gs.refs)
 595                 ber_bvarray_free(gs.refs);
 596         if (gs.ctrls) {
 597                 for (i = gs.nctrls; --i >= 0; ) {
 598                         op->o_tmpfree(gs.ctrls[i], op->o_tmpmemctx);
 599                 }
 600                 op->o_tmpfree(gs.ctrls, op->o_tmpmemctx);
 601         }
 602         return rs->sr_err;
 603 }
 604
 605 static BackendDB toolDB;
 606
 607 static int
 608 glue_tool_entry_open (
 609         BackendDB *b0,
 610         int mode
 611 )
 612 {
 613         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 614
 615         /* We don't know which backend to talk to yet, so just
 616          * remember the mode and move on...
 617          */
 618
 619         glueMode = mode;
 620         glueBack = NULL;
 621         toolDB = *b0;
 622         toolDB.bd_info = oi->oi_orig;
 623
 624         /* Sanity checks */
 625         {
 626                 slap_overinst *on = glue_tool_inst( b0->bd_info );
 627                 glueinfo        *gi = on->on_bi.bi_private;
 628
 629                 int i;
 630                 for (i = 0; i < gi->gi_nodes; i++) {
 631                         BackendDB *bd;
 632                         struct berval pdn;
 633
 634                         dnParent( &gi->gi_n[i].gn_be->be_nsuffix[0], &pdn );
 635                         bd = select_backend( &pdn, 0 );
 636                         if ( bd ) {
 637                                 ID id;
 638                                 BackendDB db;
 639
 640                                 if ( overlay_is_over( bd ) ) {
 641                                         slap_overinfo *oi = (slap_overinfo *)bd->bd_info;
 642                                         db = *bd;
 643                                         db.bd_info = oi->oi_orig;
 644                                         bd = &db;
 645                                 }
 646
 647                                 if ( !bd->bd_info->bi_tool_dn2id_get
 648                                         || !bd->bd_info->bi_tool_entry_open
 649                                         || !bd->bd_info->bi_tool_entry_close )
 650                                 {
 651                                         continue;
 652                                 }
 653
 654                                 bd->bd_info->bi_tool_entry_open( bd, 0 );
 655                                 id = bd->bd_info->bi_tool_dn2id_get( bd, &gi->gi_n[i].gn_be->be_nsuffix[0] );
 656                                 bd->bd_info->bi_tool_entry_close( bd );
 657                                 if ( id != NOID ) {
 658                                         Debug( LDAP_DEBUG_ANY,
 659                                                 "glue_tool_entry_open: subordinate database suffix entry DN=\"%s\" also present in superior database rooted at DN=\"%s\"\n",
 660                                                 gi->gi_n[i].gn_be->be_suffix[0].bv_val, bd->be_suffix[0].bv_val, 0 );
 661                                         return LDAP_OTHER;
 662                                 }
 663                         }
 664                 }
 665         }
 666
 667         return 0;
 668 }
 669
 670 static int
 671 glue_tool_entry_close (
 672         BackendDB *b0
 673 )
 674 {
 675         int rc = 0;
 676
 677         if (glueBack && glueBack != GLUEBACK_DONE) {
 678                 if (!glueBack->be_entry_close)
 679                         return 0;
 680                 rc = glueBack->be_entry_close (glueBack);
 681         }
 682         return rc;
 683 }
 684
 685 static slap_overinst *
 686 glue_tool_inst(
 687         BackendInfo *bi
 688 )
 689 {
 690         slap_overinfo   *oi = (slap_overinfo *)bi;
 691         slap_overinst   *on;
 692
 693         for ( on = oi->oi_list; on; on=on->on_next ) {
 694                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 695                         return on;
 696         }
 697         return NULL;
 698 }
 699
 700 /* This function will only be called in tool mode */
 701 static int
 702 glue_open (
 703         BackendInfo *bi
 704 )
 705 {
 706         slap_overinst *on = glue_tool_inst( bi );
 707         glueinfo                *gi = on->on_bi.bi_private;
 708         static int glueOpened = 0;
 709         int i, j, same, bsame = 0, rc = 0;
 710         ConfigReply cr = {0};
 711
 712         if (glueOpened) return 0;
 713
 714         glueOpened = 1;
 715
 716         /* If we were invoked in tool mode, open all the underlying backends */
 717         if (slapMode & SLAP_TOOL_MODE) {
 718                 for (i = 0; i<gi->gi_nodes; i++) {
 719                         same = 0;
 720                         /* Same bi_open as our main backend? */
 721                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 722                                 on->on_info->oi_orig->bi_open )
 723                                 bsame = 1;
 724
 725                         /* Loop thru the bd_info's and make sure we only
 726                          * invoke their bi_open functions once each.
 727                          */
 728                         for ( j = 0; j<i; j++ ) {
 729                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 730                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 731                                         same = 1;
 732                                         break;
 733                                 }
 734                         }
 735                         /* OK, it's unique and non-NULL, call it. */
 736                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 737                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 738                                         gi->gi_n[i].gn_be->bd_info );
 739                         /* Let backend.c take care of the rest of startup */
 740                         if ( !rc )
 741                                 rc = backend_startup_one( gi->gi_n[i].gn_be, &cr );
 742                         if ( rc ) break;
 743                 }
 744                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 745                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 746
 747         } /* other case is impossible */
 748         return rc;
 749 }
 750
 751 /* This function will only be called in tool mode */
 752 static int
 753 glue_close (
 754         BackendInfo *bi
 755 )
 756 {
 757         static int glueClosed = 0;
 758         int rc = 0;
 759
 760         if (glueClosed) return 0;
 761
 762         glueClosed = 1;
 763
 764         if (slapMode & SLAP_TOOL_MODE) {
 765                 rc = backend_shutdown( NULL );
 766         }
 767         return rc;
 768 }
 769
 770 static int
 771 glue_entry_get_rw (
 772         Operation               *op,
 773         struct berval   *dn,
 774         ObjectClass             *oc,
 775         AttributeDescription    *ad,
 776         int     rw,
 777         Entry   **e )
 778 {
 779         int rc;
 780         BackendDB *b0 = op->o_bd;
 781         op->o_bd = glue_back_select( b0, dn );
 782
 783         if ( op->o_bd->be_fetch ) {
 784                 rc = op->o_bd->be_fetch( op, dn, oc, ad, rw, e );
 785         } else {
 786                 rc = LDAP_UNWILLING_TO_PERFORM;
 787         }
 788         op->o_bd =b0;
 789         return rc;
 790 }
 791
 792 static int
 793 glue_entry_release_rw (
 794         Operation *op,
 795         Entry *e,
 796         int rw
 797 )
 798 {
 799         BackendDB *b0 = op->o_bd;
 800         int rc = -1;
 801
 802         op->o_bd = glue_back_select (b0, &e->e_nname);
 803
 804         if ( op->o_bd->be_release ) {
 805                 rc = op->o_bd->be_release( op, e, rw );
 806
 807         } else {
 808                 /* FIXME: mimic be_entry_release_rw
 809                  * when no be_release() available */
 810                 /* free entry */
 811                 entry_free( e );
 812                 rc = 0;
 813         }
 814         op->o_bd = b0;
 815         return rc;
 816 }
 817
 818 static struct berval *glue_base;
 819 static int glue_scope;
 820 static Filter *glue_filter;
 821
 822 static ID
 823 glue_tool_entry_first (
 824         BackendDB *b0
 825 )
 826 {
 827         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 828         glueinfo                *gi = on->on_bi.bi_private;
 829         int i;
 830         ID rc;
 831
 832         /* If we're starting from scratch, start at the most general */
 833         if (!glueBack) {
 834                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 835                         glueBack = &toolDB;
 836                 } else {
 837                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 838                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 839                                         gi->gi_n[i].gn_be->be_entry_first) {
 840                                                 glueBack = gi->gi_n[i].gn_be;
 841                                         break;
 842                                 }
 843                         }
 844                 }
 845         }
 846         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 847                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 848                 return NOID;
 849
 850         rc = glueBack->be_entry_first (glueBack);
 851         while ( rc == NOID ) {
 852                 if ( glueBack && glueBack->be_entry_close )
 853                         glueBack->be_entry_close (glueBack);
 854                 for (i=0; i<gi->gi_nodes; i++) {
 855                         if (gi->gi_n[i].gn_be == glueBack)
 856                                 break;
 857                 }
 858                 if (i == 0) {
 859                         glueBack = GLUEBACK_DONE;
 860                         break;
 861                 } else {
 862                         glueBack = gi->gi_n[i-1].gn_be;
 863                         rc = glue_tool_entry_first (b0);
 864                         if ( glueBack == GLUEBACK_DONE ) {
 865                                 break;
 866                         }
 867                 }
 868         }
 869         return rc;
 870 }
 871
 872 static ID
 873 glue_tool_entry_first_x (
 874         BackendDB *b0,
 875         struct berval *base,
 876         int scope,
 877         Filter *f
 878 )
 879 {
 880         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 881         glueinfo                *gi = on->on_bi.bi_private;
 882         int i;
 883         ID rc;
 884
 885         glue_base = base;
 886         glue_scope = scope;
 887         glue_filter = f;
 888
 889         /* If we're starting from scratch, start at the most general */
 890         if (!glueBack) {
 891                 if ( toolDB.be_entry_open && toolDB.be_entry_first_x ) {
 892                         glueBack = &toolDB;
 893                 } else {
 894                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 895                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 896                                         gi->gi_n[i].gn_be->be_entry_first_x)
 897                                 {
 898                                         glueBack = gi->gi_n[i].gn_be;
 899                                         break;
 900                                 }
 901                         }
 902                 }
 903         }
 904         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first_x ||
 905                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 906                 return NOID;
 907
 908         rc = glueBack->be_entry_first_x (glueBack,
 909                 glue_base, glue_scope, glue_filter);
 910         while ( rc == NOID ) {
 911                 if ( glueBack && glueBack->be_entry_close )
 912                         glueBack->be_entry_close (glueBack);
 913                 for (i=0; i<gi->gi_nodes; i++) {
 914                         if (gi->gi_n[i].gn_be == glueBack)
 915                                 break;
 916                 }
 917                 if (i == 0) {
 918                         glueBack = GLUEBACK_DONE;
 919                         break;
 920                 } else {
 921                         glueBack = gi->gi_n[i-1].gn_be;
 922                         rc = glue_tool_entry_first_x (b0,
 923                                 glue_base, glue_scope, glue_filter);
 924                         if ( glueBack == GLUEBACK_DONE ) {
 925                                 break;
 926                         }
 927                 }
 928         }
 929         return rc;
 930 }
 931
 932 static ID
 933 glue_tool_entry_next (
 934         BackendDB *b0
 935 )
 936 {
 937         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 938         glueinfo                *gi = on->on_bi.bi_private;
 939         int i;
 940         ID rc;
 941
 942         if (!glueBack || !glueBack->be_entry_next)
 943                 return NOID;
 944
 945         rc = glueBack->be_entry_next (glueBack);
 946
 947         /* If we ran out of entries in one database, move on to the next */
 948         while (rc == NOID) {
 949                 if ( glueBack && glueBack->be_entry_close )
 950                         glueBack->be_entry_close (glueBack);
 951                 for (i=0; i<gi->gi_nodes; i++) {
 952                         if (gi->gi_n[i].gn_be == glueBack)
 953                                 break;
 954                 }
 955                 if (i == 0) {
 956                         glueBack = GLUEBACK_DONE;
 957                         break;
 958                 } else {
 959                         glueBack = gi->gi_n[i-1].gn_be;
 960                         if ( glue_base || glue_filter ) {
 961                                 /* using entry_first_x() */
 962                                 rc = glue_tool_entry_first_x (b0,
 963                                         glue_base, glue_scope, glue_filter);
 964
 965                         } else {
 966                                 /* using entry_first() */
 967                                 rc = glue_tool_entry_first (b0);
 968                         }
 969                         if ( glueBack == GLUEBACK_DONE ) {
 970                                 break;
 971                         }
 972                 }
 973         }
 974         return rc;
 975 }
 976
 977 static ID
 978 glue_tool_dn2id_get (
 979         BackendDB *b0,
 980         struct berval *dn
 981 )
 982 {
 983         BackendDB *be, b2;
 984         int rc = -1;
 985
 986         b2 = *b0;
 987         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
 988         be = glue_back_select (&b2, dn);
 989         if ( be == &b2 ) be = &toolDB;
 990
 991         if (!be->be_dn2id_get)
 992                 return NOID;
 993
 994         if (!glueBack) {
 995                 if ( be->be_entry_open ) {
 996                         rc = be->be_entry_open (be, glueMode);
 997                 }
 998                 if (rc != 0) {
 999                         return NOID;
1000                 }
1001         } else if (be != glueBack) {
1002                 /* If this entry belongs in a different branch than the
1003                  * previous one, close the current database and open the
1004                  * new one.
1005                  */
1006                 if ( glueBack->be_entry_close ) {
1007                         glueBack->be_entry_close (glueBack);
1008                 }
1009                 if ( be->be_entry_open ) {
1010                         rc = be->be_entry_open (be, glueMode);
1011                 }
1012                 if (rc != 0) {
1013                         return NOID;
1014                 }
1015         }
1016         glueBack = be;
1017         return be->be_dn2id_get (be, dn);
1018 }
1019
1020 static Entry *
1021 glue_tool_entry_get (
1022         BackendDB *b0,
1023         ID id
1024 )
1025 {
1026         if (!glueBack || !glueBack->be_entry_get)
1027                 return NULL;
1028
1029         return glueBack->be_entry_get (glueBack, id);
1030 }
1031
1032 static ID
1033 glue_tool_entry_put (
1034         BackendDB *b0,
1035         Entry *e,
1036         struct berval *text
1037 )
1038 {
1039         BackendDB *be, b2;
1040         int rc = -1;
1041
1042         b2 = *b0;
1043         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
1044         be = glue_back_select (&b2, &e->e_nname);
1045         if ( be == &b2 ) be = &toolDB;
1046
1047         if (!be->be_entry_put)
1048                 return NOID;
1049
1050         if (!glueBack) {
1051                 if ( be->be_entry_open ) {
1052                         rc = be->be_entry_open (be, glueMode);
1053                 }
1054                 if (rc != 0) {
1055                         return NOID;
1056                 }
1057         } else if (be != glueBack) {
1058                 /* If this entry belongs in a different branch than the
1059                  * previous one, close the current database and open the
1060                  * new one.
1061                  */
1062                 if ( glueBack->be_entry_close ) {
1063                         glueBack->be_entry_close (glueBack);
1064                 }
1065                 if ( be->be_entry_open ) {
1066                         rc = be->be_entry_open (be, glueMode);
1067                 }
1068                 if (rc != 0) {
1069                         return NOID;
1070                 }
1071         }
1072         glueBack = be;
1073         return be->be_entry_put (be, e, text);
1074 }
1075
1076 static ID
1077 glue_tool_entry_modify (
1078         BackendDB *b0,
1079         Entry *e,
1080         struct berval *text
1081 )
1082 {
1083         if (!glueBack || !glueBack->be_entry_modify)
1084                 return NOID;
1085
1086         return glueBack->be_entry_modify (glueBack, e, text);
1087 }
1088
1089 static int
1090 glue_tool_entry_reindex (
1091         BackendDB *b0,
1092         ID id,
1093         AttributeDescription **adv
1094 )
1095 {
1096         if (!glueBack || !glueBack->be_entry_reindex)
1097                 return -1;
1098
1099         return glueBack->be_entry_reindex (glueBack, id, adv);
1100 }
1101
1102 static int
1103 glue_tool_sync (
1104         BackendDB *b0
1105 )
1106 {
1107         slap_overinst   *on = glue_tool_inst( b0->bd_info );
1108         glueinfo                *gi = on->on_bi.bi_private;
1109         BackendInfo             *bi = b0->bd_info;
1110         int i;
1111
1112         /* just sync everyone */
1113         for (i = 0; i<gi->gi_nodes; i++)
1114                 if (gi->gi_n[i].gn_be->be_sync)
1115                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
1116         b0->bd_info = on->on_info->oi_orig;
1117         if ( b0->be_sync )
1118                 b0->be_sync( b0 );
1119         b0->bd_info = bi;
1120         return 0;
1121 }
1122
1123 typedef struct glue_Addrec {
1124         struct glue_Addrec *ga_next;
1125         BackendDB *ga_be;
1126 } glue_Addrec;
1127
1128 /* List of added subordinates */
1129 static glue_Addrec *ga_list;
1130 static int ga_adding;
1131
1132 static int
1133 glue_db_init(
1134         BackendDB *be,
1135         ConfigReply *cr
1136 )
1137 {
1138         slap_overinst   *on = (slap_overinst *)be->bd_info;
1139         slap_overinfo   *oi = on->on_info;
1140         BackendInfo     *bi = oi->oi_orig;
1141         glueinfo *gi;
1142
1143         if ( SLAP_GLUE_SUBORDINATE( be )) {
1144                 Debug( LDAP_DEBUG_ANY, "glue: backend %s is already subordinate, "
1145                         "cannot have glue overlay!\n",
1146                         be->be_suffix[0].bv_val, 0, 0 );
1147                 return LDAP_OTHER;
1148         }
1149
1150         gi = ch_calloc( 1, sizeof(glueinfo));
1151         on->on_bi.bi_private = gi;
1152         dnParent( be->be_nsuffix, &gi->gi_pdn );
1153
1154         /* Currently the overlay framework doesn't handle these entry points
1155          * but we need them....
1156          */
1157         oi->oi_bi.bi_open = glue_open;
1158         oi->oi_bi.bi_close = glue_close;
1159
1160         /* Only advertise these if the root DB supports them */
1161         if ( bi->bi_tool_entry_open )
1162                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
1163         if ( bi->bi_tool_entry_close )
1164                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
1165         if ( bi->bi_tool_entry_first )
1166                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
1167         /* FIXME: check whether all support bi_tool_entry_first_x() ? */
1168         if ( bi->bi_tool_entry_first_x )
1169                 oi->oi_bi.bi_tool_entry_first_x = glue_tool_entry_first_x;
1170         if ( bi->bi_tool_entry_next )
1171                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
1172         if ( bi->bi_tool_entry_get )
1173                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
1174         if ( bi->bi_tool_dn2id_get )
1175                 oi->oi_bi.bi_tool_dn2id_get = glue_tool_dn2id_get;
1176         if ( bi->bi_tool_entry_put )
1177                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
1178         if ( bi->bi_tool_entry_reindex )
1179                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
1180         if ( bi->bi_tool_entry_modify )
1181                 oi->oi_bi.bi_tool_entry_modify = glue_tool_entry_modify;
1182         if ( bi->bi_tool_sync )
1183                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
1184
1185         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
1186
1187         if ( ga_list ) {
1188                 be->bd_info = (BackendInfo *)oi;
1189                 glue_sub_attach( 1 );
1190         }
1191
1192         return 0;
1193 }
1194
1195 static int
1196 glue_db_destroy (
1197         BackendDB *be,
1198         ConfigReply *cr
1199 )
1200 {
1201         slap_overinst   *on = (slap_overinst *)be->bd_info;
1202         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
1203
1204         free (gi);
1205         return SLAP_CB_CONTINUE;
1206 }
1207
1208 static int
1209 glue_db_close(
1210         BackendDB *be,
1211         ConfigReply *cr
1212 )
1213 {
1214         slap_overinst   *on = (slap_overinst *)be->bd_info;
1215
1216         on->on_info->oi_bi.bi_db_close = 0;
1217         return 0;
1218 }
1219
1220 int
1221 glue_sub_del( BackendDB *b0 )
1222 {
1223         BackendDB *be;
1224         int rc = 0;
1225
1226         /* Find the top backend for this subordinate */
1227         be = b0;
1228         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
1229                 slap_overinfo *oi;
1230                 slap_overinst *on;
1231                 glueinfo *gi;
1232                 int i;
1233
1234                 if ( SLAP_GLUE_SUBORDINATE( be ))
1235                         continue;
1236                 if ( !SLAP_GLUE_INSTANCE( be ))
1237                         continue;
1238                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
1239                         continue;
1240
1241                 /* OK, got the right backend, find the overlay */
1242                 oi = (slap_overinfo *)be->bd_info;
1243                 for ( on=oi->oi_list; on; on=on->on_next ) {
1244                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
1245                                 break;
1246                 }
1247                 assert( on != NULL );
1248                 gi = on->on_bi.bi_private;
1249                 for ( i=0; i < gi->gi_nodes; i++ ) {
1250                         if ( gi->gi_n[i].gn_be == b0 ) {
1251                                 int j;
1252
1253                                 for (j=i+1; j < gi->gi_nodes; j++)
1254                                         gi->gi_n[j-1] = gi->gi_n[j];
1255
1256                                 gi->gi_nodes--;
1257                         }
1258                 }
1259         }
1260         if ( be == NULL )
1261                 rc = LDAP_NO_SUCH_OBJECT;
1262
1263         return rc;
1264 }
1265
1266
1267 /* Attach all the subordinate backends to their superior */
1268 int
1269 glue_sub_attach( int online )
1270 {
1271         glue_Addrec *ga, *gnext = NULL;
1272         int rc = 0;
1273
1274         if ( ga_adding )
1275                 return 0;
1276
1277         ga_adding = 1;
1278
1279         /* For all the subordinate backends */
1280         for ( ga=ga_list; ga != NULL; ga = gnext ) {
1281                 BackendDB *be;
1282
1283                 gnext = ga->ga_next;
1284
1285                 /* Find the top backend for this subordinate */
1286                 be = ga->ga_be;
1287                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
1288                         slap_overinfo *oi;
1289                         slap_overinst *on;
1290                         glueinfo *gi;
1291
1292                         if ( SLAP_GLUE_SUBORDINATE( be ))
1293                                 continue;
1294                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
1295                                 continue;
1296
1297                         /* If it's not already configured, set up the overlay */
1298                         if ( !SLAP_GLUE_INSTANCE( be )) {
1299                                 rc = overlay_config( be, glue.on_bi.bi_type, -1, NULL, NULL);
1300                                 if ( rc )
1301                                         break;
1302                         }
1303                         /* Find the overlay instance */
1304                         oi = (slap_overinfo *)be->bd_info;
1305                         for ( on=oi->oi_list; on; on=on->on_next ) {
1306                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
1307                                         break;
1308                         }
1309                         assert( on != NULL );
1310                         gi = on->on_bi.bi_private;
1311                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
1312                                 gi->gi_nodes * sizeof(gluenode));
1313                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
1314                         dnParent( &ga->ga_be->be_nsuffix[0],
1315                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
1316                         gi->gi_nodes++;
1317                         on->on_bi.bi_private = gi;
1318                         ga->ga_be->be_flags |= SLAP_DBFLAG_GLUE_LINKED;
1319                         break;
1320                 }
1321                 if ( !be ) {
1322                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
1323                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
1324                         /* allow this for now, assume a superior will
1325                          * be added later
1326                          */
1327                         if ( online ) {
1328                                 rc = 0;
1329                                 gnext = ga_list;
1330                                 break;
1331                         }
1332                         rc = LDAP_NO_SUCH_OBJECT;
1333                 }
1334                 ch_free( ga );
1335                 if ( rc ) break;
1336         }
1337
1338         ga_list = gnext;
1339
1340         ga_adding = 0;
1341
1342         return rc;
1343 }
1344
1345 int
1346 glue_sub_add( BackendDB *be, int advert, int online )
1347 {
1348         glue_Addrec *ga;
1349         int rc = 0;
1350
1351         if ( overlay_is_inst( be, "glue" )) {
1352                 Debug( LDAP_DEBUG_ANY, "glue: backend %s already has glue overlay, "
1353                         "cannot be a subordinate!\n",
1354                         be->be_suffix[0].bv_val, 0, 0 );
1355                 return LDAP_OTHER;
1356         }
1357         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
1358         if ( advert )
1359                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
1360
1361         ga = ch_malloc( sizeof( glue_Addrec ));
1362         ga->ga_next = ga_list;
1363         ga->ga_be = be;
1364         ga_list = ga;
1365
1366         if ( online )
1367                 rc = glue_sub_attach( online );
1368
1369         return rc;
1370 }
1371
1372 static int
1373 glue_access_allowed(
1374         Operation               *op,
1375         Entry                   *e,
1376         AttributeDescription    *desc,
1377         struct berval           *val,
1378         slap_access_t           access,
1379         AccessControlState      *state,
1380         slap_mask_t             *maskp )
1381 {
1382         BackendDB *b0, *be = glue_back_select( op->o_bd, &e->e_nname );
1383         int rc;
1384
1385         if ( be == NULL || be == op->o_bd || be->bd_info->bi_access_allowed == NULL )
1386                 return SLAP_CB_CONTINUE;
1387
1388         b0 = op->o_bd;
1389         op->o_bd = be;
1390         rc = be->bd_info->bi_access_allowed ( op, e, desc, val, access, state, maskp );
1391         op->o_bd = b0;
1392         return rc;
1393 }
1394
1395 int
1396 glue_sub_init()
1397 {
1398         glue.on_bi.bi_type = "glue";
1399
1400         glue.on_bi.bi_db_init = glue_db_init;
1401         glue.on_bi.bi_db_close = glue_db_close;
1402         glue.on_bi.bi_db_destroy = glue_db_destroy;
1403
1404         glue.on_bi.bi_op_search = glue_op_search;
1405         glue.on_bi.bi_op_modify = glue_op_func;
1406         glue.on_bi.bi_op_modrdn = glue_op_func;
1407         glue.on_bi.bi_op_add = glue_op_func;
1408         glue.on_bi.bi_op_delete = glue_op_func;
1409         glue.on_bi.bi_extended = glue_op_func;
1410
1411         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
1412         glue.on_bi.bi_chk_controls = glue_chk_controls;
1413         glue.on_bi.bi_entry_get_rw = glue_entry_get_rw;
1414         glue.on_bi.bi_entry_release_rw = glue_entry_release_rw;
1415         glue.on_bi.bi_access_allowed = glue_access_allowed;
1416
1417         glue.on_response = glue_response;
1418
1419         return overlay_register( &glue );
1420 }