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 2001-2014 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, *bi1;
 229         slap_operation_t which = op_bind;
 230         int rc;
 231
 232         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 233
 234         /* If we're on the master backend, let overlay framework handle it */
 235         if ( op->o_bd == b0 )
 236                 return SLAP_CB_CONTINUE;
 237
 238         b0->bd_info = on->on_info->oi_orig;
 239
 240         switch(op->o_tag) {
 241         case LDAP_REQ_ADD: which = op_add; break;
 242         case LDAP_REQ_DELETE: which = op_delete; break;
 243         case LDAP_REQ_MODIFY: which = op_modify; break;
 244         case LDAP_REQ_MODRDN: which = op_modrdn; break;
 245         case LDAP_REQ_EXTENDED: which = op_extended; break;
 246         default: assert( 0 ); break;
 247         }
 248
 249         bi1 = op->o_bd->bd_info;
 250         rc = (&bi1->bi_op_bind)[ which ] ?
 251                 (&bi1->bi_op_bind)[ which ]( op, rs ) : SLAP_CB_BYPASS;
 252
 253         op->o_bd = b0;
 254         op->o_bd->bd_info = bi0;
 255         return rc;
 256 }
 257
 258 static int
 259 glue_op_abandon( Operation *op, SlapReply *rs )
 260 {
 261         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 262         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 263         BackendDB *b0 = op->o_bd;
 264         BackendInfo *bi0 = op->o_bd->bd_info;
 265         int i;
 266
 267         b0->bd_info = on->on_info->oi_orig;
 268
 269         for (i = gi->gi_nodes-1; i >= 0; i--) {
 270                 assert( gi->gi_n[i].gn_be->be_nsuffix != NULL );
 271                 op->o_bd = gi->gi_n[i].gn_be;
 272                 if ( op->o_bd == b0 )
 273                         continue;
 274                 if ( op->o_bd->bd_info->bi_op_abandon )
 275                         op->o_bd->bd_info->bi_op_abandon( op, rs );
 276         }
 277         op->o_bd = b0;
 278         op->o_bd->bd_info = bi0;
 279         return SLAP_CB_CONTINUE;
 280 }
 281
 282 static int
 283 glue_response ( Operation *op, SlapReply *rs )
 284 {
 285         BackendDB *be = op->o_bd;
 286         be = glue_back_select (op->o_bd, &op->o_req_ndn);
 287
 288         /* If we're on the master backend, let overlay framework handle it.
 289          * Otherwise, bail out.
 290          */
 291         return ( op->o_bd == be ) ? SLAP_CB_CONTINUE : SLAP_CB_BYPASS;
 292 }
 293
 294 static int
 295 glue_chk_referrals ( Operation *op, SlapReply *rs )
 296 {
 297         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 298         BackendDB *b0 = op->o_bd;
 299         BackendInfo *bi0 = op->o_bd->bd_info;
 300         int rc;
 301
 302         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 303         if ( op->o_bd == b0 )
 304                 return SLAP_CB_CONTINUE;
 305
 306         b0->bd_info = on->on_info->oi_orig;
 307
 308         if ( op->o_bd->bd_info->bi_chk_referrals )
 309                 rc = ( *op->o_bd->bd_info->bi_chk_referrals )( op, rs );
 310         else
 311                 rc = SLAP_CB_CONTINUE;
 312
 313         op->o_bd = b0;
 314         op->o_bd->bd_info = bi0;
 315         return rc;
 316 }
 317
 318 static int
 319 glue_chk_controls ( Operation *op, SlapReply *rs )
 320 {
 321         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 322         BackendDB *b0 = op->o_bd;
 323         BackendInfo *bi0 = op->o_bd->bd_info;
 324         int rc = SLAP_CB_CONTINUE;
 325
 326         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 327         if ( op->o_bd == b0 )
 328                 return SLAP_CB_CONTINUE;
 329
 330         b0->bd_info = on->on_info->oi_orig;
 331
 332         /* if the subordinate database has overlays, the bi_chk_controls()
 333          * hook is actually over_aux_chk_controls(); in case it actually
 334          * wraps a missing hok, we need to mimic the behavior
 335          * of the frontend applied to that database */
 336         if ( op->o_bd->bd_info->bi_chk_controls ) {
 337                 rc = ( *op->o_bd->bd_info->bi_chk_controls )( op, rs );
 338         }
 339
 340
 341         if ( rc == SLAP_CB_CONTINUE ) {
 342                 rc = backend_check_controls( op, rs );
 343         }
 344
 345         op->o_bd = b0;
 346         op->o_bd->bd_info = bi0;
 347         return rc;
 348 }
 349
 350 /* ITS#4615 - overlays configured above the glue overlay should be
 351  * invoked for the entire glued tree. Overlays configured below the
 352  * glue overlay should only be invoked on the master backend.
 353  * So, if we're searching on any subordinates, we need to force the
 354  * current overlay chain to stop processing, without stopping the
 355  * overall callback flow.
 356  */
 357 static int
 358 glue_sub_search( Operation *op, SlapReply *rs, BackendDB *b0,
 359         slap_overinst *on )
 360 {
 361         /* Process any overlays on the master backend */
 362         if ( op->o_bd == b0 && on->on_next ) {
 363                 BackendInfo *bi = op->o_bd->bd_info;
 364                 int rc = SLAP_CB_CONTINUE;
 365                 for ( on=on->on_next; on; on=on->on_next ) {
 366                         op->o_bd->bd_info = (BackendInfo *)on;
 367                         if ( on->on_bi.bi_op_search ) {
 368                                 rc = on->on_bi.bi_op_search( op, rs );
 369                                 if ( rc != SLAP_CB_CONTINUE )
 370                                         break;
 371                         }
 372                 }
 373                 op->o_bd->bd_info = bi;
 374                 if ( rc != SLAP_CB_CONTINUE )
 375                         return rc;
 376         }
 377         return op->o_bd->be_search( op, rs );
 378 }
 379
 380 static const ID glueID = NOID;
 381 static const struct berval gluecookie = { sizeof( glueID ), (char *)&glueID };
 382
 383 static int
 384 glue_op_search ( Operation *op, SlapReply *rs )
 385 {
 386         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 387         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 388         BackendDB *b0 = op->o_bd;
 389         BackendDB *b1 = NULL, *btmp;
 390         BackendInfo *bi0 = op->o_bd->bd_info;
 391         int i;
 392         long stoptime = 0, starttime;
 393         glue_state gs = {NULL, NULL, NULL, 0, 0, 0, 0};
 394         slap_callback cb = { NULL, glue_op_response, glue_op_cleanup, NULL };
 395         int scope0, tlimit0;
 396         struct berval dn, ndn, *pdn;
 397
 398         cb.sc_private = &gs;
 399
 400         cb.sc_next = op->o_callback;
 401
 402         starttime = op->o_time;
 403         stoptime = slap_get_time () + op->ors_tlimit;
 404
 405         /* reset dummy cookie used to keep paged results going across databases */
 406         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED
 407                 && bvmatch( &((PagedResultsState *)op->o_pagedresults_state)->ps_cookieval, &gluecookie ) )
 408         {
 409                 PagedResultsState *ps = op->o_pagedresults_state;
 410                 BerElementBuffer berbuf;
 411                 BerElement *ber = (BerElement *)&berbuf;
 412                 struct berval cookie = BER_BVC(""), value;
 413                 int c;
 414
 415                 for (c = 0; op->o_ctrls[c] != NULL; c++) {
 416                         if (strcmp(op->o_ctrls[c]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS) == 0)
 417                                 break;
 418                 }
 419
 420                 assert( op->o_ctrls[c] != NULL );
 421
 422                 ber_init2( ber, NULL, LBER_USE_DER );
 423                 ber_printf( ber, "{iO}", ps->ps_size, &cookie );
 424                 ber_flatten2( ber, &value, 0 );
 425                 assert( op->o_ctrls[c]->ldctl_value.bv_len >= value.bv_len );
 426                 op->o_ctrls[c]->ldctl_value.bv_len = value.bv_len;
 427                 lutil_memcopy( op->o_ctrls[c]->ldctl_value.bv_val,
 428                         value.bv_val, value.bv_len );
 429                 ber_free_buf( ber );
 430
 431                 ps->ps_cookie = (PagedResultsCookie)0;
 432                 BER_BVZERO( &ps->ps_cookieval );
 433         }
 434
 435         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 436         b0->bd_info = on->on_info->oi_orig;
 437
 438         switch (op->ors_scope) {
 439         case LDAP_SCOPE_BASE:
 440                 if ( op->o_bd == b0 )
 441                         return SLAP_CB_CONTINUE;
 442
 443                 if (op->o_bd && op->o_bd->be_search) {
 444                         rs->sr_err = op->o_bd->be_search( op, rs );
 445                 } else {
 446                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 447                 }
 448                 return rs->sr_err;
 449
 450         case LDAP_SCOPE_ONELEVEL:
 451         case LDAP_SCOPE_SUBTREE:
 452         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 453                 op->o_callback = &cb;
 454                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 455                 scope0 = op->ors_scope;
 456                 tlimit0 = op->ors_tlimit;
 457                 dn = op->o_req_dn;
 458                 ndn = op->o_req_ndn;
 459                 b1 = op->o_bd;
 460
 461                 /*
 462                  * Execute in reverse order, most specific first
 463                  */
 464                 for (i = gi->gi_nodes; i >= 0; i--) {
 465                         if ( i == gi->gi_nodes ) {
 466                                 btmp = b0;
 467                                 pdn = &gi->gi_pdn;
 468                         } else {
 469                                 btmp = gi->gi_n[i].gn_be;
 470                                 pdn = &gi->gi_n[i].gn_pdn;
 471                         }
 472                         if (!btmp || !btmp->be_search)
 473                                 continue;
 474                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 475                                 continue;
 476                         if (get_no_subordinate_glue(op) && btmp != b1)
 477                                 continue;
 478                         /* If we remembered which backend we were on before,
 479                          * skip down to it now
 480                          */
 481                         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED &&
 482                                 op->o_conn->c_pagedresults_state.ps_be &&
 483                                 op->o_conn->c_pagedresults_state.ps_be != btmp )
 484                                 continue;
 485
 486                         if (tlimit0 != SLAP_NO_LIMIT) {
 487                                 op->o_time = slap_get_time();
 488                                 op->ors_tlimit = stoptime - op->o_time;
 489                                 if (op->ors_tlimit <= 0) {
 490                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 491                                         break;
 492                                 }
 493                         }
 494                         rs->sr_err = 0;
 495                         /*
 496                          * check for abandon
 497                          */
 498                         if (op->o_abandon) {
 499                                 goto end_of_loop;
 500                         }
 501                         op->o_bd = btmp;
 502
 503                         assert( op->o_bd->be_suffix != NULL );
 504                         assert( op->o_bd->be_nsuffix != NULL );
 505
 506                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 507                                 dn_match(pdn, &ndn))
 508                         {
 509                                 struct berval mdn, mndn;
 510                                 op->ors_scope = LDAP_SCOPE_BASE;
 511                                 mdn = op->o_req_dn = op->o_bd->be_suffix[0];
 512                                 mndn = op->o_req_ndn = op->o_bd->be_nsuffix[0];
 513                                 rs->sr_err = op->o_bd->be_search(op, rs);
 514                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 515                                         gs.err = LDAP_SUCCESS;
 516                                 }
 517                                 op->ors_scope = LDAP_SCOPE_ONELEVEL;
 518                                 if ( op->o_req_dn.bv_val == mdn.bv_val )
 519                                         op->o_req_dn = dn;
 520                                 if ( op->o_req_ndn.bv_val == mndn.bv_val )
 521                                         op->o_req_ndn = ndn;
 522
 523                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 524                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 525                         {
 526                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 527
 528                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 529                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 530                         {
 531                                 struct berval mdn, mndn;
 532                                 mdn = op->o_req_dn = op->o_bd->be_suffix[0];
 533                                 mndn = op->o_req_ndn = op->o_bd->be_nsuffix[0];
 534                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 535                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 536                                         gs.err = LDAP_SUCCESS;
 537                                 }
 538                                 if ( op->o_req_dn.bv_val == mdn.bv_val )
 539                                         op->o_req_dn = dn;
 540                                 if ( op->o_req_ndn.bv_val == mndn.bv_val )
 541                                         op->o_req_ndn = ndn;
 542
 543                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 544                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 545                         }
 546
 547                         switch ( gs.err ) {
 548
 549                         /*
 550                          * Add errors that should result in dropping
 551                          * the search
 552                          */
 553                         case LDAP_SIZELIMIT_EXCEEDED:
 554                         case LDAP_TIMELIMIT_EXCEEDED:
 555                         case LDAP_ADMINLIMIT_EXCEEDED:
 556                         case LDAP_NO_SUCH_OBJECT:
 557 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 558                         case LDAP_X_CANNOT_CHAIN:
 559 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 560                                 goto end_of_loop;
 561
 562                         case LDAP_SUCCESS:
 563                                 if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 564                                         PagedResultsState *ps = op->o_pagedresults_state;
 565
 566                                         /* Assume this backend can be forgotten now */
 567                                         op->o_conn->c_pagedresults_state.ps_be = NULL;
 568
 569                                         /* If we have a full page, exit the loop. We may
 570                                          * need to remember this backend so we can continue
 571                                          * from here on a subsequent request.
 572                                          */
 573                                         if ( rs->sr_nentries >= ps->ps_size ) {
 574                                                 PagedResultsState *cps = &op->o_conn->c_pagedresults_state;
 575
 576                                                 /* Don't bother to remember the first backend.
 577                                                  * Only remember the last one if there's more state left.
 578                                                  */
 579                                                 if ( op->o_bd != b0 &&
 580                                                         ( cps->ps_cookie != NOID
 581                                                                 || !BER_BVISNULL( &cps->ps_cookieval )
 582                                                                 || op->o_bd != gi->gi_n[0].gn_be ) )
 583                                                 {
 584                                                         op->o_conn->c_pagedresults_state.ps_be = op->o_bd;
 585                                                 }
 586
 587                                                 /* Check whether the cookie is empty,
 588                                                  * and give remaining databases a chance
 589                                                  */
 590                                                 if ( op->o_bd != gi->gi_n[0].gn_be || cps->ps_cookie == NOID ) {
 591                                                         int             c;
 592
 593                                                         for ( c = 0; gs.ctrls[c] != NULL; c++ ) {
 594                                                                 if ( strcmp( gs.ctrls[c]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS ) == 0 ) {
 595                                                                         break;
 596                                                                 }
 597                                                         }
 598
 599                                                         if ( gs.ctrls[c] != NULL ) {
 600                                                                 BerElementBuffer berbuf;
 601                                                                 BerElement      *ber = (BerElement *)&berbuf;
 602                                                                 ber_tag_t       tag;
 603                                                                 ber_int_t       size;
 604                                                                 struct berval   cookie, value;
 605
 606                                                                 ber_init2( ber, &gs.ctrls[c]->ldctl_value, LBER_USE_DER );
 607
 608                                                                 tag = ber_scanf( ber, "{im}", &size, &cookie );
 609                                                                 assert( tag != LBER_ERROR );
 610
 611                                                                 if ( BER_BVISEMPTY( &cookie ) && op->o_bd != gi->gi_n[0].gn_be ) {
 612                                                                         /* delete old, create new cookie with NOID */
 613                                                                         PagedResultsCookie respcookie = (PagedResultsCookie)NOID;
 614                                                                         ber_len_t oidlen = strlen( gs.ctrls[c]->ldctl_oid );
 615                                                                         LDAPControl *newctrl;
 616
 617                                                                         /* it's next database's turn */
 618                                                                         if ( btmp == b0 ) {
 619                                                                                 op->o_conn->c_pagedresults_state.ps_be = gi->gi_n[gi->gi_nodes - 1].gn_be;
 620
 621                                                                         } else {
 622                                                                                 op->o_conn->c_pagedresults_state.ps_be = gi->gi_n[(i > 0 ? i - 1: 0)].gn_be;
 623                                                                         }
 624
 625                                                                         cookie.bv_val = (char *)&respcookie;
 626                                                                         cookie.bv_len = sizeof( PagedResultsCookie );
 627
 628                                                                         ber_init2( ber, NULL, LBER_USE_DER );
 629                                                                         ber_printf( ber, "{iO}", 0, &cookie );
 630                                                                         ber_flatten2( ber, &value, 0 );
 631
 632                                                                         newctrl = op->o_tmprealloc( gs.ctrls[c],
 633                                                                                 sizeof(LDAPControl) + oidlen + 1 + value.bv_len + 1,
 634                                                                                 op->o_tmpmemctx);
 635                                                                         newctrl->ldctl_iscritical = gs.ctrls[c]->ldctl_iscritical;
 636                                                                         newctrl->ldctl_oid = (char *)&newctrl[1];
 637                                                                         lutil_strcopy( newctrl->ldctl_oid, gs.ctrls[c]->ldctl_oid );
 638                                                                         newctrl->ldctl_value.bv_len = value.bv_len;
 639                                                                         lutil_memcopy( newctrl->ldctl_value.bv_val,
 640                                                                                 value.bv_val, value.bv_len );
 641
 642                                                                         gs.ctrls[c] = newctrl;
 643
 644                                                                         ber_free_buf( ber );
 645
 646                                                                 } else if ( !BER_BVISEMPTY( &cookie ) && op->o_bd != b0 ) {
 647                                                                         /* if cookie not empty, it's again this database's turn */
 648                                                                         op->o_conn->c_pagedresults_state.ps_be = op->o_bd;
 649                                                                 }
 650                                                         }
 651                                                 }
 652
 653                                                 goto end_of_loop;
 654                                         }
 655
 656                                         /* This backend has run out of entries, but more responses
 657                                          * can fit in the page. Fake a reset of the state so the
 658                                          * next backend will start up properly. Only back-[bh]db
 659                                          * and back-sql look at this state info.
 660                                          */
 661                                         ps->ps_cookie = (PagedResultsCookie)0;
 662                                         BER_BVZERO( &ps->ps_cookieval );
 663
 664                                         {
 665                                                 /* change the size of the page in the request
 666                                                  * that will be propagated, and reset the cookie */
 667                                                 BerElementBuffer berbuf;
 668                                                 BerElement *ber = (BerElement *)&berbuf;
 669                                                 int size = ps->ps_size - rs->sr_nentries;
 670                                                 struct berval cookie = BER_BVC(""), value;
 671                                                 int c;
 672
 673                                                 for (c = 0; op->o_ctrls[c] != NULL; c++) {
 674                                                         if (strcmp(op->o_ctrls[c]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS) == 0)
 675                                                                 break;
 676                                                 }
 677
 678                                                 assert( op->o_ctrls[c] != NULL );
 679
 680                                                 ber_init2( ber, NULL, LBER_USE_DER );
 681                                                 ber_printf( ber, "{iO}", size, &cookie );
 682                                                 ber_flatten2( ber, &value, 0 );
 683                                                 assert( op->o_ctrls[c]->ldctl_value.bv_len >= value.bv_len );
 684                                                 op->o_ctrls[c]->ldctl_value.bv_len = value.bv_len;
 685                                                 lutil_memcopy( op->o_ctrls[c]->ldctl_value.bv_val,
 686                                                         value.bv_val, value.bv_len );
 687                                                 ber_free_buf( ber );
 688                                         }
 689                                 }
 690
 691                         default:
 692                                 break;
 693                         }
 694                 }
 695 end_of_loop:;
 696                 op->ors_scope = scope0;
 697                 op->ors_tlimit = tlimit0;
 698                 op->o_time = starttime;
 699
 700                 break;
 701         }
 702
 703         op->o_callback = cb.sc_next;
 704         if ( op->o_abandon ) {
 705                 rs->sr_err = SLAPD_ABANDON;
 706         } else {
 707                 rs->sr_err = gs.err;
 708                 rs->sr_matched = gs.matched;
 709                 rs->sr_ref = gs.refs;
 710         }
 711         rs->sr_ctrls = gs.ctrls;
 712
 713         send_ldap_result( op, rs );
 714
 715         op->o_bd = b0;
 716         op->o_bd->bd_info = bi0;
 717         if (gs.matched)
 718                 free (gs.matched);
 719         if (gs.refs)
 720                 ber_bvarray_free(gs.refs);
 721         if (gs.ctrls) {
 722                 for (i = gs.nctrls; --i >= 0; ) {
 723                         op->o_tmpfree(gs.ctrls[i], op->o_tmpmemctx);
 724                 }
 725                 op->o_tmpfree(gs.ctrls, op->o_tmpmemctx);
 726         }
 727         return rs->sr_err;
 728 }
 729
 730 static BackendDB toolDB;
 731
 732 static int
 733 glue_tool_entry_open (
 734         BackendDB *b0,
 735         int mode
 736 )
 737 {
 738         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 739
 740         /* We don't know which backend to talk to yet, so just
 741          * remember the mode and move on...
 742          */
 743
 744         glueMode = mode;
 745         glueBack = NULL;
 746         toolDB = *b0;
 747         toolDB.bd_info = oi->oi_orig;
 748
 749         /* Sanity checks */
 750         {
 751                 slap_overinst *on = glue_tool_inst( b0->bd_info );
 752                 glueinfo        *gi = on->on_bi.bi_private;
 753
 754                 int i;
 755                 for (i = 0; i < gi->gi_nodes; i++) {
 756                         BackendDB *bd;
 757                         struct berval pdn;
 758
 759                         dnParent( &gi->gi_n[i].gn_be->be_nsuffix[0], &pdn );
 760                         bd = select_backend( &pdn, 0 );
 761                         if ( bd ) {
 762                                 ID id;
 763                                 BackendDB db;
 764
 765                                 if ( overlay_is_over( bd ) ) {
 766                                         slap_overinfo *oi = (slap_overinfo *)bd->bd_info;
 767                                         db = *bd;
 768                                         db.bd_info = oi->oi_orig;
 769                                         bd = &db;
 770                                 }
 771
 772                                 if ( !bd->bd_info->bi_tool_dn2id_get
 773                                         || !bd->bd_info->bi_tool_entry_open
 774                                         || !bd->bd_info->bi_tool_entry_close )
 775                                 {
 776                                         continue;
 777                                 }
 778
 779                                 bd->bd_info->bi_tool_entry_open( bd, 0 );
 780                                 id = bd->bd_info->bi_tool_dn2id_get( bd, &gi->gi_n[i].gn_be->be_nsuffix[0] );
 781                                 bd->bd_info->bi_tool_entry_close( bd );
 782                                 if ( id != NOID ) {
 783                                         Debug( LDAP_DEBUG_ANY,
 784                                                 "glue_tool_entry_open: subordinate database suffix entry DN=\"%s\" also present in superior database rooted at DN=\"%s\"\n",
 785                                                 gi->gi_n[i].gn_be->be_suffix[0].bv_val, bd->be_suffix[0].bv_val, 0 );
 786                                         return LDAP_OTHER;
 787                                 }
 788                         }
 789                 }
 790         }
 791
 792         return 0;
 793 }
 794
 795 static int
 796 glue_tool_entry_close (
 797         BackendDB *b0
 798 )
 799 {
 800         int rc = 0;
 801
 802         if (glueBack && glueBack != GLUEBACK_DONE) {
 803                 if (!glueBack->be_entry_close)
 804                         return 0;
 805                 rc = glueBack->be_entry_close (glueBack);
 806         }
 807         return rc;
 808 }
 809
 810 static slap_overinst *
 811 glue_tool_inst(
 812         BackendInfo *bi
 813 )
 814 {
 815         slap_overinfo   *oi = (slap_overinfo *)bi;
 816         slap_overinst   *on;
 817
 818         for ( on = oi->oi_list; on; on=on->on_next ) {
 819                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 820                         return on;
 821         }
 822         return NULL;
 823 }
 824
 825 /* This function will only be called in tool mode */
 826 static int
 827 glue_open (
 828         BackendInfo *bi
 829 )
 830 {
 831         slap_overinst *on = glue_tool_inst( bi );
 832         glueinfo                *gi = on->on_bi.bi_private;
 833         static int glueOpened = 0;
 834         int i, j, same, bsame = 0, rc = 0;
 835         ConfigReply cr = {0};
 836
 837         if (glueOpened) return 0;
 838
 839         glueOpened = 1;
 840
 841         /* If we were invoked in tool mode, open all the underlying backends */
 842         if (slapMode & SLAP_TOOL_MODE) {
 843                 for (i = 0; i<gi->gi_nodes; i++) {
 844                         same = 0;
 845                         /* Same bi_open as our main backend? */
 846                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 847                                 on->on_info->oi_orig->bi_open )
 848                                 bsame = 1;
 849
 850                         /* Loop thru the bd_info's and make sure we only
 851                          * invoke their bi_open functions once each.
 852                          */
 853                         for ( j = 0; j<i; j++ ) {
 854                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 855                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 856                                         same = 1;
 857                                         break;
 858                                 }
 859                         }
 860                         /* OK, it's unique and non-NULL, call it. */
 861                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 862                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 863                                         gi->gi_n[i].gn_be->bd_info );
 864                         /* Let backend.c take care of the rest of startup */
 865                         if ( !rc )
 866                                 rc = backend_startup_one( gi->gi_n[i].gn_be, &cr );
 867                         if ( rc ) break;
 868                 }
 869                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 870                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 871
 872         } /* other case is impossible */
 873         return rc;
 874 }
 875
 876 /* This function will only be called in tool mode */
 877 static int
 878 glue_close (
 879         BackendInfo *bi
 880 )
 881 {
 882         static int glueClosed = 0;
 883         int rc = 0;
 884
 885         if (glueClosed) return 0;
 886
 887         glueClosed = 1;
 888
 889         if (slapMode & SLAP_TOOL_MODE) {
 890                 rc = backend_shutdown( NULL );
 891         }
 892         return rc;
 893 }
 894
 895 static int
 896 glue_entry_get_rw (
 897         Operation               *op,
 898         struct berval   *dn,
 899         ObjectClass             *oc,
 900         AttributeDescription    *ad,
 901         int     rw,
 902         Entry   **e )
 903 {
 904         int rc;
 905         BackendDB *b0 = op->o_bd;
 906         op->o_bd = glue_back_select( b0, dn );
 907
 908         if ( op->o_bd->be_fetch ) {
 909                 rc = op->o_bd->be_fetch( op, dn, oc, ad, rw, e );
 910         } else {
 911                 rc = LDAP_UNWILLING_TO_PERFORM;
 912         }
 913         op->o_bd =b0;
 914         return rc;
 915 }
 916
 917 static int
 918 glue_entry_release_rw (
 919         Operation *op,
 920         Entry *e,
 921         int rw
 922 )
 923 {
 924         BackendDB *b0 = op->o_bd;
 925         int rc = -1;
 926
 927         op->o_bd = glue_back_select (b0, &e->e_nname);
 928
 929         if ( op->o_bd->be_release ) {
 930                 rc = op->o_bd->be_release( op, e, rw );
 931
 932         } else {
 933                 /* FIXME: mimic be_entry_release_rw
 934                  * when no be_release() available */
 935                 /* free entry */
 936                 entry_free( e );
 937                 rc = 0;
 938         }
 939         op->o_bd = b0;
 940         return rc;
 941 }
 942
 943 static struct berval *glue_base;
 944 static int glue_scope;
 945 static Filter *glue_filter;
 946
 947 static ID
 948 glue_tool_entry_first (
 949         BackendDB *b0
 950 )
 951 {
 952         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 953         glueinfo                *gi = on->on_bi.bi_private;
 954         int i;
 955         ID rc;
 956
 957         /* If we're starting from scratch, start at the most general */
 958         if (!glueBack) {
 959                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 960                         glueBack = &toolDB;
 961                 } else {
 962                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 963                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 964                                         gi->gi_n[i].gn_be->be_entry_first) {
 965                                                 glueBack = gi->gi_n[i].gn_be;
 966                                         break;
 967                                 }
 968                         }
 969                 }
 970         }
 971         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 972                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 973                 return NOID;
 974
 975         rc = glueBack->be_entry_first (glueBack);
 976         while ( rc == NOID ) {
 977                 if ( glueBack && glueBack->be_entry_close )
 978                         glueBack->be_entry_close (glueBack);
 979                 for (i=0; i<gi->gi_nodes; i++) {
 980                         if (gi->gi_n[i].gn_be == glueBack)
 981                                 break;
 982                 }
 983                 if (i == 0) {
 984                         glueBack = GLUEBACK_DONE;
 985                         break;
 986                 } else {
 987                         glueBack = gi->gi_n[i-1].gn_be;
 988                         rc = glue_tool_entry_first (b0);
 989                         if ( glueBack == GLUEBACK_DONE ) {
 990                                 break;
 991                         }
 992                 }
 993         }
 994         return rc;
 995 }
 996
 997 static ID
 998 glue_tool_entry_first_x (
 999         BackendDB *b0,
1000         struct berval *base,
1001         int scope,
1002         Filter *f
1003 )
1004 {
1005         slap_overinst   *on = glue_tool_inst( b0->bd_info );
1006         glueinfo                *gi = on->on_bi.bi_private;
1007         int i;
1008         ID rc;
1009
1010         glue_base = base;
1011         glue_scope = scope;
1012         glue_filter = f;
1013
1014         /* If we're starting from scratch, start at the most general */
1015         if (!glueBack) {
1016                 if ( toolDB.be_entry_open && toolDB.be_entry_first_x ) {
1017                         glueBack = &toolDB;
1018                 } else {
1019                         for (i = gi->gi_nodes-1; i >= 0; i--) {
1020                                 if (gi->gi_n[i].gn_be->be_entry_open &&
1021                                         gi->gi_n[i].gn_be->be_entry_first_x)
1022                                 {
1023                                         glueBack = gi->gi_n[i].gn_be;
1024                                         break;
1025                                 }
1026                         }
1027                 }
1028         }
1029         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first_x ||
1030                 glueBack->be_entry_open (glueBack, glueMode) != 0)
1031                 return NOID;
1032
1033         rc = glueBack->be_entry_first_x (glueBack,
1034                 glue_base, glue_scope, glue_filter);
1035         while ( rc == NOID ) {
1036                 if ( glueBack && glueBack->be_entry_close )
1037                         glueBack->be_entry_close (glueBack);
1038                 for (i=0; i<gi->gi_nodes; i++) {
1039                         if (gi->gi_n[i].gn_be == glueBack)
1040                                 break;
1041                 }
1042                 if (i == 0) {
1043                         glueBack = GLUEBACK_DONE;
1044                         break;
1045                 } else {
1046                         glueBack = gi->gi_n[i-1].gn_be;
1047                         rc = glue_tool_entry_first_x (b0,
1048                                 glue_base, glue_scope, glue_filter);
1049                         if ( glueBack == GLUEBACK_DONE ) {
1050                                 break;
1051                         }
1052                 }
1053         }
1054         return rc;
1055 }
1056
1057 static ID
1058 glue_tool_entry_next (
1059         BackendDB *b0
1060 )
1061 {
1062         slap_overinst   *on = glue_tool_inst( b0->bd_info );
1063         glueinfo                *gi = on->on_bi.bi_private;
1064         int i;
1065         ID rc;
1066
1067         if (!glueBack || !glueBack->be_entry_next)
1068                 return NOID;
1069
1070         rc = glueBack->be_entry_next (glueBack);
1071
1072         /* If we ran out of entries in one database, move on to the next */
1073         while (rc == NOID) {
1074                 if ( glueBack && glueBack->be_entry_close )
1075                         glueBack->be_entry_close (glueBack);
1076                 for (i=0; i<gi->gi_nodes; i++) {
1077                         if (gi->gi_n[i].gn_be == glueBack)
1078                                 break;
1079                 }
1080                 if (i == 0) {
1081                         glueBack = GLUEBACK_DONE;
1082                         break;
1083                 } else {
1084                         glueBack = gi->gi_n[i-1].gn_be;
1085                         if ( glue_base || glue_filter ) {
1086                                 /* using entry_first_x() */
1087                                 rc = glue_tool_entry_first_x (b0,
1088                                         glue_base, glue_scope, glue_filter);
1089
1090                         } else {
1091                                 /* using entry_first() */
1092                                 rc = glue_tool_entry_first (b0);
1093                         }
1094                         if ( glueBack == GLUEBACK_DONE ) {
1095                                 break;
1096                         }
1097                 }
1098         }
1099         return rc;
1100 }
1101
1102 static ID
1103 glue_tool_dn2id_get (
1104         BackendDB *b0,
1105         struct berval *dn
1106 )
1107 {
1108         BackendDB *be, b2;
1109         int rc = -1;
1110
1111         b2 = *b0;
1112         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
1113         be = glue_back_select (&b2, dn);
1114         if ( be == &b2 ) be = &toolDB;
1115
1116         if (!be->be_dn2id_get)
1117                 return NOID;
1118
1119         if (!glueBack) {
1120                 if ( be->be_entry_open ) {
1121                         rc = be->be_entry_open (be, glueMode);
1122                 }
1123                 if (rc != 0) {
1124                         return NOID;
1125                 }
1126         } else if (be != glueBack) {
1127                 /* If this entry belongs in a different branch than the
1128                  * previous one, close the current database and open the
1129                  * new one.
1130                  */
1131                 if ( glueBack->be_entry_close ) {
1132                         glueBack->be_entry_close (glueBack);
1133                 }
1134                 if ( be->be_entry_open ) {
1135                         rc = be->be_entry_open (be, glueMode);
1136                 }
1137                 if (rc != 0) {
1138                         return NOID;
1139                 }
1140         }
1141         glueBack = be;
1142         return be->be_dn2id_get (be, dn);
1143 }
1144
1145 static Entry *
1146 glue_tool_entry_get (
1147         BackendDB *b0,
1148         ID id
1149 )
1150 {
1151         if (!glueBack || !glueBack->be_entry_get)
1152                 return NULL;
1153
1154         return glueBack->be_entry_get (glueBack, id);
1155 }
1156
1157 static ID
1158 glue_tool_entry_put (
1159         BackendDB *b0,
1160         Entry *e,
1161         struct berval *text
1162 )
1163 {
1164         BackendDB *be, b2;
1165         int rc = -1;
1166
1167         b2 = *b0;
1168         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
1169         be = glue_back_select (&b2, &e->e_nname);
1170         if ( be == &b2 ) be = &toolDB;
1171
1172         if (!be->be_entry_put)
1173                 return NOID;
1174
1175         if (!glueBack) {
1176                 if ( be->be_entry_open ) {
1177                         rc = be->be_entry_open (be, glueMode);
1178                 }
1179                 if (rc != 0) {
1180                         return NOID;
1181                 }
1182         } else if (be != glueBack) {
1183                 /* If this entry belongs in a different branch than the
1184                  * previous one, close the current database and open the
1185                  * new one.
1186                  */
1187                 if ( glueBack->be_entry_close ) {
1188                         glueBack->be_entry_close (glueBack);
1189                 }
1190                 if ( be->be_entry_open ) {
1191                         rc = be->be_entry_open (be, glueMode);
1192                 }
1193                 if (rc != 0) {
1194                         return NOID;
1195                 }
1196         }
1197         glueBack = be;
1198         return be->be_entry_put (be, e, text);
1199 }
1200
1201 static ID
1202 glue_tool_entry_modify (
1203         BackendDB *b0,
1204         Entry *e,
1205         struct berval *text
1206 )
1207 {
1208         if (!glueBack || !glueBack->be_entry_modify)
1209                 return NOID;
1210
1211         return glueBack->be_entry_modify (glueBack, e, text);
1212 }
1213
1214 static int
1215 glue_tool_entry_reindex (
1216         BackendDB *b0,
1217         ID id,
1218         AttributeDescription **adv
1219 )
1220 {
1221         if (!glueBack || !glueBack->be_entry_reindex)
1222                 return -1;
1223
1224         return glueBack->be_entry_reindex (glueBack, id, adv);
1225 }
1226
1227 static int
1228 glue_tool_sync (
1229         BackendDB *b0
1230 )
1231 {
1232         slap_overinst   *on = glue_tool_inst( b0->bd_info );
1233         glueinfo                *gi = on->on_bi.bi_private;
1234         BackendInfo             *bi = b0->bd_info;
1235         int i;
1236
1237         /* just sync everyone */
1238         for (i = 0; i<gi->gi_nodes; i++)
1239                 if (gi->gi_n[i].gn_be->be_sync)
1240                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
1241         b0->bd_info = on->on_info->oi_orig;
1242         if ( b0->be_sync )
1243                 b0->be_sync( b0 );
1244         b0->bd_info = bi;
1245         return 0;
1246 }
1247
1248 typedef struct glue_Addrec {
1249         struct glue_Addrec *ga_next;
1250         BackendDB *ga_be;
1251 } glue_Addrec;
1252
1253 /* List of added subordinates */
1254 static glue_Addrec *ga_list;
1255 static int ga_adding;
1256
1257 static int
1258 glue_db_init(
1259         BackendDB *be,
1260         ConfigReply *cr
1261 )
1262 {
1263         slap_overinst   *on = (slap_overinst *)be->bd_info;
1264         slap_overinfo   *oi = on->on_info;
1265         BackendInfo     *bi = oi->oi_orig;
1266         glueinfo *gi;
1267
1268         if ( SLAP_GLUE_SUBORDINATE( be )) {
1269                 Debug( LDAP_DEBUG_ANY, "glue: backend %s is already subordinate, "
1270                         "cannot have glue overlay!\n",
1271                         be->be_suffix[0].bv_val, 0, 0 );
1272                 return LDAP_OTHER;
1273         }
1274
1275         gi = ch_calloc( 1, sizeof(glueinfo));
1276         on->on_bi.bi_private = gi;
1277         dnParent( be->be_nsuffix, &gi->gi_pdn );
1278
1279         /* Currently the overlay framework doesn't handle these entry points
1280          * but we need them....
1281          */
1282         oi->oi_bi.bi_open = glue_open;
1283         oi->oi_bi.bi_close = glue_close;
1284
1285         /* Only advertise these if the root DB supports them */
1286         if ( bi->bi_tool_entry_open )
1287                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
1288         if ( bi->bi_tool_entry_close )
1289                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
1290         if ( bi->bi_tool_entry_first )
1291                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
1292         /* FIXME: check whether all support bi_tool_entry_first_x() ? */
1293         if ( bi->bi_tool_entry_first_x )
1294                 oi->oi_bi.bi_tool_entry_first_x = glue_tool_entry_first_x;
1295         if ( bi->bi_tool_entry_next )
1296                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
1297         if ( bi->bi_tool_entry_get )
1298                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
1299         if ( bi->bi_tool_dn2id_get )
1300                 oi->oi_bi.bi_tool_dn2id_get = glue_tool_dn2id_get;
1301         if ( bi->bi_tool_entry_put )
1302                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
1303         if ( bi->bi_tool_entry_reindex )
1304                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
1305         if ( bi->bi_tool_entry_modify )
1306                 oi->oi_bi.bi_tool_entry_modify = glue_tool_entry_modify;
1307         if ( bi->bi_tool_sync )
1308                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
1309
1310         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
1311
1312         if ( ga_list ) {
1313                 be->bd_info = (BackendInfo *)oi;
1314                 glue_sub_attach( 1 );
1315         }
1316
1317         return 0;
1318 }
1319
1320 static int
1321 glue_db_destroy (
1322         BackendDB *be,
1323         ConfigReply *cr
1324 )
1325 {
1326         slap_overinst   *on = (slap_overinst *)be->bd_info;
1327         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
1328
1329         free (gi);
1330         return SLAP_CB_CONTINUE;
1331 }
1332
1333 static int
1334 glue_db_close(
1335         BackendDB *be,
1336         ConfigReply *cr
1337 )
1338 {
1339         slap_overinst   *on = (slap_overinst *)be->bd_info;
1340
1341         on->on_info->oi_bi.bi_db_close = 0;
1342         return 0;
1343 }
1344
1345 int
1346 glue_sub_del( BackendDB *b0 )
1347 {
1348         BackendDB *be;
1349         int rc = 0;
1350
1351         /* Find the top backend for this subordinate */
1352         be = b0;
1353         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
1354                 slap_overinfo *oi;
1355                 slap_overinst *on;
1356                 glueinfo *gi;
1357                 int i;
1358
1359                 if ( SLAP_GLUE_SUBORDINATE( be ))
1360                         continue;
1361                 if ( !SLAP_GLUE_INSTANCE( be ))
1362                         continue;
1363                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
1364                         continue;
1365
1366                 /* OK, got the right backend, find the overlay */
1367                 oi = (slap_overinfo *)be->bd_info;
1368                 for ( on=oi->oi_list; on; on=on->on_next ) {
1369                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
1370                                 break;
1371                 }
1372                 assert( on != NULL );
1373                 gi = on->on_bi.bi_private;
1374                 for ( i=0; i < gi->gi_nodes; i++ ) {
1375                         if ( gi->gi_n[i].gn_be == b0 ) {
1376                                 int j;
1377
1378                                 for (j=i+1; j < gi->gi_nodes; j++)
1379                                         gi->gi_n[j-1] = gi->gi_n[j];
1380
1381                                 gi->gi_nodes--;
1382                         }
1383                 }
1384         }
1385         if ( be == NULL )
1386                 rc = LDAP_NO_SUCH_OBJECT;
1387
1388         return rc;
1389 }
1390
1391
1392 /* Attach all the subordinate backends to their superior */
1393 int
1394 glue_sub_attach( int online )
1395 {
1396         glue_Addrec *ga, *gnext = NULL;
1397         int rc = 0;
1398
1399         if ( ga_adding )
1400                 return 0;
1401
1402         ga_adding = 1;
1403
1404         /* For all the subordinate backends */
1405         for ( ga=ga_list; ga != NULL; ga = gnext ) {
1406                 BackendDB *be;
1407
1408                 gnext = ga->ga_next;
1409
1410                 /* Find the top backend for this subordinate */
1411                 be = ga->ga_be;
1412                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
1413                         slap_overinfo *oi;
1414                         slap_overinst *on;
1415                         glueinfo *gi;
1416
1417                         if ( SLAP_GLUE_SUBORDINATE( be ))
1418                                 continue;
1419                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
1420                                 continue;
1421
1422                         /* If it's not already configured, set up the overlay */
1423                         if ( !SLAP_GLUE_INSTANCE( be )) {
1424                                 rc = overlay_config( be, glue.on_bi.bi_type, -1, NULL, NULL);
1425                                 if ( rc )
1426                                         break;
1427                         }
1428                         /* Find the overlay instance */
1429                         oi = (slap_overinfo *)be->bd_info;
1430                         for ( on=oi->oi_list; on; on=on->on_next ) {
1431                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
1432                                         break;
1433                         }
1434                         assert( on != NULL );
1435                         gi = on->on_bi.bi_private;
1436                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
1437                                 gi->gi_nodes * sizeof(gluenode));
1438                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
1439                         dnParent( &ga->ga_be->be_nsuffix[0],
1440                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
1441                         gi->gi_nodes++;
1442                         on->on_bi.bi_private = gi;
1443                         ga->ga_be->be_flags |= SLAP_DBFLAG_GLUE_LINKED;
1444                         break;
1445                 }
1446                 if ( !be ) {
1447                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
1448                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
1449                         /* allow this for now, assume a superior will
1450                          * be added later
1451                          */
1452                         if ( online ) {
1453                                 rc = 0;
1454                                 gnext = ga_list;
1455                                 break;
1456                         }
1457                         rc = LDAP_NO_SUCH_OBJECT;
1458                 }
1459                 ch_free( ga );
1460                 if ( rc ) break;
1461         }
1462
1463         ga_list = gnext;
1464
1465         ga_adding = 0;
1466
1467         return rc;
1468 }
1469
1470 int
1471 glue_sub_add( BackendDB *be, int advert, int online )
1472 {
1473         glue_Addrec *ga;
1474         int rc = 0;
1475
1476         if ( overlay_is_inst( be, "glue" )) {
1477                 Debug( LDAP_DEBUG_ANY, "glue: backend %s already has glue overlay, "
1478                         "cannot be a subordinate!\n",
1479                         be->be_suffix[0].bv_val, 0, 0 );
1480                 return LDAP_OTHER;
1481         }
1482         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
1483         if ( advert )
1484                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
1485
1486         ga = ch_malloc( sizeof( glue_Addrec ));
1487         ga->ga_next = ga_list;
1488         ga->ga_be = be;
1489         ga_list = ga;
1490
1491         if ( online )
1492                 rc = glue_sub_attach( online );
1493
1494         return rc;
1495 }
1496
1497 static int
1498 glue_access_allowed(
1499         Operation               *op,
1500         Entry                   *e,
1501         AttributeDescription    *desc,
1502         struct berval           *val,
1503         slap_access_t           access,
1504         AccessControlState      *state,
1505         slap_mask_t             *maskp )
1506 {
1507         BackendDB *b0, *be = glue_back_select( op->o_bd, &e->e_nname );
1508         int rc;
1509
1510         if ( be == NULL || be == op->o_bd || be->bd_info->bi_access_allowed == NULL )
1511                 return SLAP_CB_CONTINUE;
1512
1513         b0 = op->o_bd;
1514         op->o_bd = be;
1515         rc = be->bd_info->bi_access_allowed ( op, e, desc, val, access, state, maskp );
1516         op->o_bd = b0;
1517         return rc;
1518 }
1519
1520 int
1521 glue_sub_init()
1522 {
1523         glue.on_bi.bi_type = "glue";
1524
1525         glue.on_bi.bi_db_init = glue_db_init;
1526         glue.on_bi.bi_db_close = glue_db_close;
1527         glue.on_bi.bi_db_destroy = glue_db_destroy;
1528
1529         glue.on_bi.bi_op_search = glue_op_search;
1530         glue.on_bi.bi_op_modify = glue_op_func;
1531         glue.on_bi.bi_op_modrdn = glue_op_func;
1532         glue.on_bi.bi_op_add = glue_op_func;
1533         glue.on_bi.bi_op_delete = glue_op_func;
1534         glue.on_bi.bi_op_abandon = glue_op_abandon;
1535         glue.on_bi.bi_extended = glue_op_func;
1536
1537         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
1538         glue.on_bi.bi_chk_controls = glue_chk_controls;
1539         glue.on_bi.bi_entry_get_rw = glue_entry_get_rw;
1540         glue.on_bi.bi_entry_release_rw = glue_entry_release_rw;
1541         glue.on_bi.bi_access_allowed = glue_access_allowed;
1542
1543         glue.on_response = glue_response;
1544
1545         return overlay_register( &glue );
1546 }