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 2001-2011 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 const ID glueID = NOID;
 360 static const struct berval gluecookie = { sizeof( glueID ), (char *)&glueID };
 361
 362 static int
 363 glue_op_search ( Operation *op, SlapReply *rs )
 364 {
 365         slap_overinst   *on = (slap_overinst *)op->o_bd->bd_info;
 366         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
 367         BackendDB *b0 = op->o_bd;
 368         BackendDB *b1 = NULL, *btmp;
 369         BackendInfo *bi0 = op->o_bd->bd_info;
 370         int i;
 371         long stoptime = 0, starttime;
 372         glue_state gs = {NULL, NULL, NULL, 0, 0, 0, 0};
 373         slap_callback cb = { NULL, glue_op_response, glue_op_cleanup, NULL };
 374         int scope0, tlimit0;
 375         struct berval dn, ndn, *pdn;
 376
 377         cb.sc_private = &gs;
 378
 379         cb.sc_next = op->o_callback;
 380
 381         starttime = op->o_time;
 382         stoptime = slap_get_time () + op->ors_tlimit;
 383
 384         /* reset dummy cookie used to keep paged results going across databases */
 385         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED
 386                 && bvmatch( &((PagedResultsState *)op->o_pagedresults_state)->ps_cookieval, &gluecookie ) )
 387         {
 388                 PagedResultsState *ps = op->o_pagedresults_state;
 389                 BerElementBuffer berbuf;
 390                 BerElement *ber = (BerElement *)&berbuf;
 391                 struct berval cookie = BER_BVC(""), value;
 392                 int c;
 393
 394                 for (c = 0; op->o_ctrls[c] != NULL; c++) {
 395                         if (strcmp(op->o_ctrls[c]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS) == 0)
 396                                 break;
 397                 }
 398
 399                 assert( op->o_ctrls[c] != NULL );
 400
 401                 ber_init2( ber, NULL, LBER_USE_DER );
 402                 ber_printf( ber, "{iO}", ps->ps_size, &cookie );
 403                 ber_flatten2( ber, &value, 0 );
 404                 assert( op->o_ctrls[c]->ldctl_value.bv_len >= value.bv_len );
 405                 op->o_ctrls[c]->ldctl_value.bv_len = value.bv_len;
 406                 lutil_memcopy( op->o_ctrls[c]->ldctl_value.bv_val,
 407                         value.bv_val, value.bv_len );
 408                 ber_free_buf( ber );
 409
 410                 ps->ps_cookie = (PagedResultsCookie)0;
 411                 BER_BVZERO( &ps->ps_cookieval );
 412         }
 413
 414         op->o_bd = glue_back_select (b0, &op->o_req_ndn);
 415         b0->bd_info = on->on_info->oi_orig;
 416
 417         switch (op->ors_scope) {
 418         case LDAP_SCOPE_BASE:
 419                 if ( op->o_bd == b0 )
 420                         return SLAP_CB_CONTINUE;
 421
 422                 if (op->o_bd && op->o_bd->be_search) {
 423                         rs->sr_err = op->o_bd->be_search( op, rs );
 424                 } else {
 425                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 426                 }
 427                 return rs->sr_err;
 428
 429         case LDAP_SCOPE_ONELEVEL:
 430         case LDAP_SCOPE_SUBTREE:
 431         case LDAP_SCOPE_SUBORDINATE: /* FIXME */
 432                 op->o_callback = &cb;
 433                 rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM;
 434                 scope0 = op->ors_scope;
 435                 tlimit0 = op->ors_tlimit;
 436                 dn = op->o_req_dn;
 437                 ndn = op->o_req_ndn;
 438                 b1 = op->o_bd;
 439
 440                 /*
 441                  * Execute in reverse order, most specific first
 442                  */
 443                 for (i = gi->gi_nodes; i >= 0; i--) {
 444                         if ( i == gi->gi_nodes ) {
 445                                 btmp = b0;
 446                                 pdn = &gi->gi_pdn;
 447                         } else {
 448                                 btmp = gi->gi_n[i].gn_be;
 449                                 pdn = &gi->gi_n[i].gn_pdn;
 450                         }
 451                         if (!btmp || !btmp->be_search)
 452                                 continue;
 453                         if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0]))
 454                                 continue;
 455                         if (get_no_subordinate_glue(op) && btmp != b1)
 456                                 continue;
 457                         /* If we remembered which backend we were on before,
 458                          * skip down to it now
 459                          */
 460                         if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED &&
 461                                 op->o_conn->c_pagedresults_state.ps_be &&
 462                                 op->o_conn->c_pagedresults_state.ps_be != btmp )
 463                                 continue;
 464
 465                         if (tlimit0 != SLAP_NO_LIMIT) {
 466                                 op->o_time = slap_get_time();
 467                                 op->ors_tlimit = stoptime - op->o_time;
 468                                 if (op->ors_tlimit <= 0) {
 469                                         rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED;
 470                                         break;
 471                                 }
 472                         }
 473                         rs->sr_err = 0;
 474                         /*
 475                          * check for abandon
 476                          */
 477                         if (op->o_abandon) {
 478                                 goto end_of_loop;
 479                         }
 480                         op->o_bd = btmp;
 481
 482                         assert( op->o_bd->be_suffix != NULL );
 483                         assert( op->o_bd->be_nsuffix != NULL );
 484
 485                         if (scope0 == LDAP_SCOPE_ONELEVEL &&
 486                                 dn_match(pdn, &ndn))
 487                         {
 488                                 struct berval mdn, mndn;
 489                                 op->ors_scope = LDAP_SCOPE_BASE;
 490                                 mdn = op->o_req_dn = op->o_bd->be_suffix[0];
 491                                 mndn = op->o_req_ndn = op->o_bd->be_nsuffix[0];
 492                                 rs->sr_err = op->o_bd->be_search(op, rs);
 493                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 494                                         gs.err = LDAP_SUCCESS;
 495                                 }
 496                                 op->ors_scope = LDAP_SCOPE_ONELEVEL;
 497                                 if ( op->o_req_dn.bv_val == mdn.bv_val )
 498                                         op->o_req_dn = dn;
 499                                 if ( op->o_req_ndn.bv_val == mndn.bv_val )
 500                                         op->o_req_ndn = ndn;
 501
 502                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 503                                 dn_match(&op->o_bd->be_nsuffix[0], &ndn))
 504                         {
 505                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 506
 507                         } else if (scope0 == LDAP_SCOPE_SUBTREE &&
 508                                 dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn))
 509                         {
 510                                 struct berval mdn, mndn;
 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 = glue_sub_search( op, rs, b0, on );
 514                                 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) {
 515                                         gs.err = LDAP_SUCCESS;
 516                                 }
 517                                 if ( op->o_req_dn.bv_val == mdn.bv_val )
 518                                         op->o_req_dn = dn;
 519                                 if ( op->o_req_ndn.bv_val == mndn.bv_val )
 520                                         op->o_req_ndn = ndn;
 521
 522                         } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) {
 523                                 rs->sr_err = glue_sub_search( op, rs, b0, on );
 524                         }
 525
 526                         switch ( gs.err ) {
 527
 528                         /*
 529                          * Add errors that should result in dropping
 530                          * the search
 531                          */
 532                         case LDAP_SIZELIMIT_EXCEEDED:
 533                         case LDAP_TIMELIMIT_EXCEEDED:
 534                         case LDAP_ADMINLIMIT_EXCEEDED:
 535                         case LDAP_NO_SUCH_OBJECT:
 536 #ifdef LDAP_CONTROL_X_CHAINING_BEHAVIOR
 537                         case LDAP_X_CANNOT_CHAIN:
 538 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
 539                                 goto end_of_loop;
 540
 541                         case LDAP_SUCCESS:
 542                                 if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 543                                         PagedResultsState *ps = op->o_pagedresults_state;
 544
 545                                         /* Assume this backend can be forgotten now */
 546                                         op->o_conn->c_pagedresults_state.ps_be = NULL;
 547
 548                                         /* If we have a full page, exit the loop. We may
 549                                          * need to remember this backend so we can continue
 550                                          * from here on a subsequent request.
 551                                          */
 552                                         if ( rs->sr_nentries >= ps->ps_size ) {
 553                                                 PagedResultsState *cps = &op->o_conn->c_pagedresults_state;
 554
 555                                                 /* Don't bother to remember the first backend.
 556                                                  * Only remember the last one if there's more state left.
 557                                                  */
 558                                                 if ( op->o_bd != b0 &&
 559                                                         ( cps->ps_cookie != NOID
 560                                                                 || !BER_BVISNULL( &cps->ps_cookieval )
 561                                                                 || op->o_bd != gi->gi_n[0].gn_be ) )
 562                                                 {
 563                                                         op->o_conn->c_pagedresults_state.ps_be = op->o_bd;
 564                                                 }
 565
 566                                                 /* Check whether the cookie is empty,
 567                                                  * and give remaining databases a chance
 568                                                  */
 569                                                 if ( op->o_bd != gi->gi_n[0].gn_be || cps->ps_cookie == NOID ) {
 570                                                         int             c;
 571
 572                                                         for ( c = 0; gs.ctrls[c] != NULL; c++ ) {
 573                                                                 if ( strcmp( gs.ctrls[c]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS ) == 0 ) {
 574                                                                         break;
 575                                                                 }
 576                                                         }
 577
 578                                                         if ( gs.ctrls[c] != NULL ) {
 579                                                                 BerElementBuffer berbuf;
 580                                                                 BerElement      *ber = (BerElement *)&berbuf;
 581                                                                 ber_tag_t       tag;
 582                                                                 ber_int_t       size;
 583                                                                 struct berval   cookie, value;
 584
 585                                                                 ber_init2( ber, &gs.ctrls[c]->ldctl_value, LBER_USE_DER );
 586
 587                                                                 tag = ber_scanf( ber, "{im}", &size, &cookie );
 588                                                                 assert( tag != LBER_ERROR );
 589
 590                                                                 if ( BER_BVISEMPTY( &cookie ) && op->o_bd != gi->gi_n[0].gn_be ) {
 591                                                                         /* delete old, create new cookie with NOID */
 592                                                                         PagedResultsCookie respcookie = (PagedResultsCookie)NOID;
 593                                                                         ber_len_t oidlen = strlen( gs.ctrls[c]->ldctl_oid );
 594                                                                         LDAPControl *newctrl;
 595
 596                                                                         /* it's next database's turn */
 597                                                                         if ( btmp == b0 ) {
 598                                                                                 op->o_conn->c_pagedresults_state.ps_be = gi->gi_n[gi->gi_nodes - 1].gn_be;
 599
 600                                                                         } else {
 601                                                                                 op->o_conn->c_pagedresults_state.ps_be = gi->gi_n[(i > 0 ? i - 1: 0)].gn_be;
 602                                                                         }
 603
 604                                                                         cookie.bv_val = (char *)&respcookie;
 605                                                                         cookie.bv_len = sizeof( PagedResultsCookie );
 606
 607                                                                         ber_init2( ber, NULL, LBER_USE_DER );
 608                                                                         ber_printf( ber, "{iO}", 0, &cookie );
 609                                                                         ber_flatten2( ber, &value, 0 );
 610
 611                                                                         newctrl = op->o_tmprealloc( gs.ctrls[c],
 612                                                                                 sizeof(LDAPControl) + oidlen + 1 + value.bv_len + 1,
 613                                                                                 op->o_tmpmemctx);
 614                                                                         newctrl->ldctl_iscritical = gs.ctrls[c]->ldctl_iscritical;
 615                                                                         newctrl->ldctl_oid = (char *)&newctrl[1];
 616                                                                         lutil_strcopy( newctrl->ldctl_oid, gs.ctrls[c]->ldctl_oid );
 617                                                                         newctrl->ldctl_value.bv_len = value.bv_len;
 618                                                                         lutil_memcopy( newctrl->ldctl_value.bv_val,
 619                                                                                 value.bv_val, value.bv_len );
 620
 621                                                                         gs.ctrls[c] = newctrl;
 622
 623                                                                         ber_free_buf( ber );
 624
 625                                                                 } else if ( !BER_BVISEMPTY( &cookie ) && op->o_bd != b0 ) {
 626                                                                         /* if cookie not empty, it's again this database's turn */
 627                                                                         op->o_conn->c_pagedresults_state.ps_be = op->o_bd;
 628                                                                 }
 629                                                         }
 630                                                 }
 631
 632                                                 goto end_of_loop;
 633                                         }
 634
 635                                         /* This backend has run out of entries, but more responses
 636                                          * can fit in the page. Fake a reset of the state so the
 637                                          * next backend will start up properly. Only back-[bh]db
 638                                          * and back-sql look at this state info.
 639                                          */
 640                                         ps->ps_cookie = (PagedResultsCookie)0;
 641                                         BER_BVZERO( &ps->ps_cookieval );
 642
 643                                         {
 644                                                 /* change the size of the page in the request
 645                                                  * that will be propagated, and reset the cookie */
 646                                                 BerElementBuffer berbuf;
 647                                                 BerElement *ber = (BerElement *)&berbuf;
 648                                                 int size = ps->ps_size - rs->sr_nentries;
 649                                                 struct berval cookie = BER_BVC(""), value;
 650                                                 int c;
 651
 652                                                 for (c = 0; op->o_ctrls[c] != NULL; c++) {
 653                                                         if (strcmp(op->o_ctrls[c]->ldctl_oid, LDAP_CONTROL_PAGEDRESULTS) == 0)
 654                                                                 break;
 655                                                 }
 656
 657                                                 assert( op->o_ctrls[c] != NULL );
 658
 659                                                 ber_init2( ber, NULL, LBER_USE_DER );
 660                                                 ber_printf( ber, "{iO}", size, &cookie );
 661                                                 ber_flatten2( ber, &value, 0 );
 662                                                 assert( op->o_ctrls[c]->ldctl_value.bv_len >= value.bv_len );
 663                                                 op->o_ctrls[c]->ldctl_value.bv_len = value.bv_len;
 664                                                 lutil_memcopy( op->o_ctrls[c]->ldctl_value.bv_val,
 665                                                         value.bv_val, value.bv_len );
 666                                                 ber_free_buf( ber );
 667                                         }
 668                                 }
 669
 670                         default:
 671                                 break;
 672                         }
 673                 }
 674 end_of_loop:;
 675                 op->ors_scope = scope0;
 676                 op->ors_tlimit = tlimit0;
 677                 op->o_time = starttime;
 678
 679                 break;
 680         }
 681
 682         op->o_callback = cb.sc_next;
 683         if ( op->o_abandon ) {
 684                 rs->sr_err = SLAPD_ABANDON;
 685         } else {
 686                 rs->sr_err = gs.err;
 687                 rs->sr_matched = gs.matched;
 688                 rs->sr_ref = gs.refs;
 689         }
 690         rs->sr_ctrls = gs.ctrls;
 691
 692         send_ldap_result( op, rs );
 693
 694         op->o_bd = b0;
 695         op->o_bd->bd_info = bi0;
 696         if (gs.matched)
 697                 free (gs.matched);
 698         if (gs.refs)
 699                 ber_bvarray_free(gs.refs);
 700         if (gs.ctrls) {
 701                 for (i = gs.nctrls; --i >= 0; ) {
 702                         op->o_tmpfree(gs.ctrls[i], op->o_tmpmemctx);
 703                 }
 704                 op->o_tmpfree(gs.ctrls, op->o_tmpmemctx);
 705         }
 706         return rs->sr_err;
 707 }
 708
 709 static BackendDB toolDB;
 710
 711 static int
 712 glue_tool_entry_open (
 713         BackendDB *b0,
 714         int mode
 715 )
 716 {
 717         slap_overinfo   *oi = (slap_overinfo *)b0->bd_info;
 718
 719         /* We don't know which backend to talk to yet, so just
 720          * remember the mode and move on...
 721          */
 722
 723         glueMode = mode;
 724         glueBack = NULL;
 725         toolDB = *b0;
 726         toolDB.bd_info = oi->oi_orig;
 727
 728         /* Sanity checks */
 729         {
 730                 slap_overinst *on = glue_tool_inst( b0->bd_info );
 731                 glueinfo        *gi = on->on_bi.bi_private;
 732
 733                 int i;
 734                 for (i = 0; i < gi->gi_nodes; i++) {
 735                         BackendDB *bd;
 736                         struct berval pdn;
 737
 738                         dnParent( &gi->gi_n[i].gn_be->be_nsuffix[0], &pdn );
 739                         bd = select_backend( &pdn, 0 );
 740                         if ( bd ) {
 741                                 ID id;
 742                                 BackendDB db;
 743
 744                                 if ( overlay_is_over( bd ) ) {
 745                                         slap_overinfo *oi = (slap_overinfo *)bd->bd_info;
 746                                         db = *bd;
 747                                         db.bd_info = oi->oi_orig;
 748                                         bd = &db;
 749                                 }
 750
 751                                 if ( !bd->bd_info->bi_tool_dn2id_get
 752                                         || !bd->bd_info->bi_tool_entry_open
 753                                         || !bd->bd_info->bi_tool_entry_close )
 754                                 {
 755                                         continue;
 756                                 }
 757
 758                                 bd->bd_info->bi_tool_entry_open( bd, 0 );
 759                                 id = bd->bd_info->bi_tool_dn2id_get( bd, &gi->gi_n[i].gn_be->be_nsuffix[0] );
 760                                 bd->bd_info->bi_tool_entry_close( bd );
 761                                 if ( id != NOID ) {
 762                                         Debug( LDAP_DEBUG_ANY,
 763                                                 "glue_tool_entry_open: subordinate database suffix entry DN=\"%s\" also present in superior database rooted at DN=\"%s\"\n",
 764                                                 gi->gi_n[i].gn_be->be_suffix[0].bv_val, bd->be_suffix[0].bv_val, 0 );
 765                                         return LDAP_OTHER;
 766                                 }
 767                         }
 768                 }
 769         }
 770
 771         return 0;
 772 }
 773
 774 static int
 775 glue_tool_entry_close (
 776         BackendDB *b0
 777 )
 778 {
 779         int rc = 0;
 780
 781         if (glueBack && glueBack != GLUEBACK_DONE) {
 782                 if (!glueBack->be_entry_close)
 783                         return 0;
 784                 rc = glueBack->be_entry_close (glueBack);
 785         }
 786         return rc;
 787 }
 788
 789 static slap_overinst *
 790 glue_tool_inst(
 791         BackendInfo *bi
 792 )
 793 {
 794         slap_overinfo   *oi = (slap_overinfo *)bi;
 795         slap_overinst   *on;
 796
 797         for ( on = oi->oi_list; on; on=on->on_next ) {
 798                 if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type ))
 799                         return on;
 800         }
 801         return NULL;
 802 }
 803
 804 /* This function will only be called in tool mode */
 805 static int
 806 glue_open (
 807         BackendInfo *bi
 808 )
 809 {
 810         slap_overinst *on = glue_tool_inst( bi );
 811         glueinfo                *gi = on->on_bi.bi_private;
 812         static int glueOpened = 0;
 813         int i, j, same, bsame = 0, rc = 0;
 814         ConfigReply cr = {0};
 815
 816         if (glueOpened) return 0;
 817
 818         glueOpened = 1;
 819
 820         /* If we were invoked in tool mode, open all the underlying backends */
 821         if (slapMode & SLAP_TOOL_MODE) {
 822                 for (i = 0; i<gi->gi_nodes; i++) {
 823                         same = 0;
 824                         /* Same bi_open as our main backend? */
 825                         if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 826                                 on->on_info->oi_orig->bi_open )
 827                                 bsame = 1;
 828
 829                         /* Loop thru the bd_info's and make sure we only
 830                          * invoke their bi_open functions once each.
 831                          */
 832                         for ( j = 0; j<i; j++ ) {
 833                                 if ( gi->gi_n[i].gn_be->bd_info->bi_open ==
 834                                         gi->gi_n[j].gn_be->bd_info->bi_open ) {
 835                                         same = 1;
 836                                         break;
 837                                 }
 838                         }
 839                         /* OK, it's unique and non-NULL, call it. */
 840                         if ( !same && gi->gi_n[i].gn_be->bd_info->bi_open )
 841                                 rc = gi->gi_n[i].gn_be->bd_info->bi_open(
 842                                         gi->gi_n[i].gn_be->bd_info );
 843                         /* Let backend.c take care of the rest of startup */
 844                         if ( !rc )
 845                                 rc = backend_startup_one( gi->gi_n[i].gn_be, &cr );
 846                         if ( rc ) break;
 847                 }
 848                 if ( !rc && !bsame && on->on_info->oi_orig->bi_open )
 849                         rc = on->on_info->oi_orig->bi_open( on->on_info->oi_orig );
 850
 851         } /* other case is impossible */
 852         return rc;
 853 }
 854
 855 /* This function will only be called in tool mode */
 856 static int
 857 glue_close (
 858         BackendInfo *bi
 859 )
 860 {
 861         static int glueClosed = 0;
 862         int rc = 0;
 863
 864         if (glueClosed) return 0;
 865
 866         glueClosed = 1;
 867
 868         if (slapMode & SLAP_TOOL_MODE) {
 869                 rc = backend_shutdown( NULL );
 870         }
 871         return rc;
 872 }
 873
 874 static int
 875 glue_entry_get_rw (
 876         Operation               *op,
 877         struct berval   *dn,
 878         ObjectClass             *oc,
 879         AttributeDescription    *ad,
 880         int     rw,
 881         Entry   **e )
 882 {
 883         int rc;
 884         BackendDB *b0 = op->o_bd;
 885         op->o_bd = glue_back_select( b0, dn );
 886
 887         if ( op->o_bd->be_fetch ) {
 888                 rc = op->o_bd->be_fetch( op, dn, oc, ad, rw, e );
 889         } else {
 890                 rc = LDAP_UNWILLING_TO_PERFORM;
 891         }
 892         op->o_bd =b0;
 893         return rc;
 894 }
 895
 896 static int
 897 glue_entry_release_rw (
 898         Operation *op,
 899         Entry *e,
 900         int rw
 901 )
 902 {
 903         BackendDB *b0 = op->o_bd;
 904         int rc = -1;
 905
 906         op->o_bd = glue_back_select (b0, &e->e_nname);
 907
 908         if ( op->o_bd->be_release ) {
 909                 rc = op->o_bd->be_release( op, e, rw );
 910
 911         } else {
 912                 /* FIXME: mimic be_entry_release_rw
 913                  * when no be_release() available */
 914                 /* free entry */
 915                 entry_free( e );
 916                 rc = 0;
 917         }
 918         op->o_bd = b0;
 919         return rc;
 920 }
 921
 922 static struct berval *glue_base;
 923 static int glue_scope;
 924 static Filter *glue_filter;
 925
 926 static ID
 927 glue_tool_entry_first (
 928         BackendDB *b0
 929 )
 930 {
 931         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 932         glueinfo                *gi = on->on_bi.bi_private;
 933         int i;
 934         ID rc;
 935
 936         /* If we're starting from scratch, start at the most general */
 937         if (!glueBack) {
 938                 if ( toolDB.be_entry_open && toolDB.be_entry_first ) {
 939                         glueBack = &toolDB;
 940                 } else {
 941                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 942                                 if (gi->gi_n[i].gn_be->be_entry_open &&
 943                                         gi->gi_n[i].gn_be->be_entry_first) {
 944                                                 glueBack = gi->gi_n[i].gn_be;
 945                                         break;
 946                                 }
 947                         }
 948                 }
 949         }
 950         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first ||
 951                 glueBack->be_entry_open (glueBack, glueMode) != 0)
 952                 return NOID;
 953
 954         rc = glueBack->be_entry_first (glueBack);
 955         while ( rc == NOID ) {
 956                 if ( glueBack && glueBack->be_entry_close )
 957                         glueBack->be_entry_close (glueBack);
 958                 for (i=0; i<gi->gi_nodes; i++) {
 959                         if (gi->gi_n[i].gn_be == glueBack)
 960                                 break;
 961                 }
 962                 if (i == 0) {
 963                         glueBack = GLUEBACK_DONE;
 964                         break;
 965                 } else {
 966                         glueBack = gi->gi_n[i-1].gn_be;
 967                         rc = glue_tool_entry_first (b0);
 968                         if ( glueBack == GLUEBACK_DONE ) {
 969                                 break;
 970                         }
 971                 }
 972         }
 973         return rc;
 974 }
 975
 976 static ID
 977 glue_tool_entry_first_x (
 978         BackendDB *b0,
 979         struct berval *base,
 980         int scope,
 981         Filter *f
 982 )
 983 {
 984         slap_overinst   *on = glue_tool_inst( b0->bd_info );
 985         glueinfo                *gi = on->on_bi.bi_private;
 986         int i;
 987         ID rc;
 988
 989         glue_base = base;
 990         glue_scope = scope;
 991         glue_filter = f;
 992
 993         /* If we're starting from scratch, start at the most general */
 994         if (!glueBack) {
 995                 if ( toolDB.be_entry_open && toolDB.be_entry_first_x ) {
 996                         glueBack = &toolDB;
 997                 } else {
 998                         for (i = gi->gi_nodes-1; i >= 0; i--) {
 999                                 if (gi->gi_n[i].gn_be->be_entry_open &&
1000                                         gi->gi_n[i].gn_be->be_entry_first_x)
1001                                 {
1002                                         glueBack = gi->gi_n[i].gn_be;
1003                                         break;
1004                                 }
1005                         }
1006                 }
1007         }
1008         if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first_x ||
1009                 glueBack->be_entry_open (glueBack, glueMode) != 0)
1010                 return NOID;
1011
1012         rc = glueBack->be_entry_first_x (glueBack,
1013                 glue_base, glue_scope, glue_filter);
1014         while ( rc == NOID ) {
1015                 if ( glueBack && glueBack->be_entry_close )
1016                         glueBack->be_entry_close (glueBack);
1017                 for (i=0; i<gi->gi_nodes; i++) {
1018                         if (gi->gi_n[i].gn_be == glueBack)
1019                                 break;
1020                 }
1021                 if (i == 0) {
1022                         glueBack = GLUEBACK_DONE;
1023                         break;
1024                 } else {
1025                         glueBack = gi->gi_n[i-1].gn_be;
1026                         rc = glue_tool_entry_first_x (b0,
1027                                 glue_base, glue_scope, glue_filter);
1028                         if ( glueBack == GLUEBACK_DONE ) {
1029                                 break;
1030                         }
1031                 }
1032         }
1033         return rc;
1034 }
1035
1036 static ID
1037 glue_tool_entry_next (
1038         BackendDB *b0
1039 )
1040 {
1041         slap_overinst   *on = glue_tool_inst( b0->bd_info );
1042         glueinfo                *gi = on->on_bi.bi_private;
1043         int i;
1044         ID rc;
1045
1046         if (!glueBack || !glueBack->be_entry_next)
1047                 return NOID;
1048
1049         rc = glueBack->be_entry_next (glueBack);
1050
1051         /* If we ran out of entries in one database, move on to the next */
1052         while (rc == NOID) {
1053                 if ( glueBack && glueBack->be_entry_close )
1054                         glueBack->be_entry_close (glueBack);
1055                 for (i=0; i<gi->gi_nodes; i++) {
1056                         if (gi->gi_n[i].gn_be == glueBack)
1057                                 break;
1058                 }
1059                 if (i == 0) {
1060                         glueBack = GLUEBACK_DONE;
1061                         break;
1062                 } else {
1063                         glueBack = gi->gi_n[i-1].gn_be;
1064                         if ( glue_base || glue_filter ) {
1065                                 /* using entry_first_x() */
1066                                 rc = glue_tool_entry_first_x (b0,
1067                                         glue_base, glue_scope, glue_filter);
1068
1069                         } else {
1070                                 /* using entry_first() */
1071                                 rc = glue_tool_entry_first (b0);
1072                         }
1073                         if ( glueBack == GLUEBACK_DONE ) {
1074                                 break;
1075                         }
1076                 }
1077         }
1078         return rc;
1079 }
1080
1081 static ID
1082 glue_tool_dn2id_get (
1083         BackendDB *b0,
1084         struct berval *dn
1085 )
1086 {
1087         BackendDB *be, b2;
1088         int rc = -1;
1089
1090         b2 = *b0;
1091         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
1092         be = glue_back_select (&b2, dn);
1093         if ( be == &b2 ) be = &toolDB;
1094
1095         if (!be->be_dn2id_get)
1096                 return NOID;
1097
1098         if (!glueBack) {
1099                 if ( be->be_entry_open ) {
1100                         rc = be->be_entry_open (be, glueMode);
1101                 }
1102                 if (rc != 0) {
1103                         return NOID;
1104                 }
1105         } else if (be != glueBack) {
1106                 /* If this entry belongs in a different branch than the
1107                  * previous one, close the current database and open the
1108                  * new one.
1109                  */
1110                 if ( glueBack->be_entry_close ) {
1111                         glueBack->be_entry_close (glueBack);
1112                 }
1113                 if ( be->be_entry_open ) {
1114                         rc = be->be_entry_open (be, glueMode);
1115                 }
1116                 if (rc != 0) {
1117                         return NOID;
1118                 }
1119         }
1120         glueBack = be;
1121         return be->be_dn2id_get (be, dn);
1122 }
1123
1124 static Entry *
1125 glue_tool_entry_get (
1126         BackendDB *b0,
1127         ID id
1128 )
1129 {
1130         if (!glueBack || !glueBack->be_entry_get)
1131                 return NULL;
1132
1133         return glueBack->be_entry_get (glueBack, id);
1134 }
1135
1136 static ID
1137 glue_tool_entry_put (
1138         BackendDB *b0,
1139         Entry *e,
1140         struct berval *text
1141 )
1142 {
1143         BackendDB *be, b2;
1144         int rc = -1;
1145
1146         b2 = *b0;
1147         b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info );
1148         be = glue_back_select (&b2, &e->e_nname);
1149         if ( be == &b2 ) be = &toolDB;
1150
1151         if (!be->be_entry_put)
1152                 return NOID;
1153
1154         if (!glueBack) {
1155                 if ( be->be_entry_open ) {
1156                         rc = be->be_entry_open (be, glueMode);
1157                 }
1158                 if (rc != 0) {
1159                         return NOID;
1160                 }
1161         } else if (be != glueBack) {
1162                 /* If this entry belongs in a different branch than the
1163                  * previous one, close the current database and open the
1164                  * new one.
1165                  */
1166                 if ( glueBack->be_entry_close ) {
1167                         glueBack->be_entry_close (glueBack);
1168                 }
1169                 if ( be->be_entry_open ) {
1170                         rc = be->be_entry_open (be, glueMode);
1171                 }
1172                 if (rc != 0) {
1173                         return NOID;
1174                 }
1175         }
1176         glueBack = be;
1177         return be->be_entry_put (be, e, text);
1178 }
1179
1180 static ID
1181 glue_tool_entry_modify (
1182         BackendDB *b0,
1183         Entry *e,
1184         struct berval *text
1185 )
1186 {
1187         if (!glueBack || !glueBack->be_entry_modify)
1188                 return NOID;
1189
1190         return glueBack->be_entry_modify (glueBack, e, text);
1191 }
1192
1193 static int
1194 glue_tool_entry_reindex (
1195         BackendDB *b0,
1196         ID id,
1197         AttributeDescription **adv
1198 )
1199 {
1200         if (!glueBack || !glueBack->be_entry_reindex)
1201                 return -1;
1202
1203         return glueBack->be_entry_reindex (glueBack, id, adv);
1204 }
1205
1206 static int
1207 glue_tool_sync (
1208         BackendDB *b0
1209 )
1210 {
1211         slap_overinst   *on = glue_tool_inst( b0->bd_info );
1212         glueinfo                *gi = on->on_bi.bi_private;
1213         BackendInfo             *bi = b0->bd_info;
1214         int i;
1215
1216         /* just sync everyone */
1217         for (i = 0; i<gi->gi_nodes; i++)
1218                 if (gi->gi_n[i].gn_be->be_sync)
1219                         gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be);
1220         b0->bd_info = on->on_info->oi_orig;
1221         if ( b0->be_sync )
1222                 b0->be_sync( b0 );
1223         b0->bd_info = bi;
1224         return 0;
1225 }
1226
1227 typedef struct glue_Addrec {
1228         struct glue_Addrec *ga_next;
1229         BackendDB *ga_be;
1230 } glue_Addrec;
1231
1232 /* List of added subordinates */
1233 static glue_Addrec *ga_list;
1234 static int ga_adding;
1235
1236 static int
1237 glue_db_init(
1238         BackendDB *be,
1239         ConfigReply *cr
1240 )
1241 {
1242         slap_overinst   *on = (slap_overinst *)be->bd_info;
1243         slap_overinfo   *oi = on->on_info;
1244         BackendInfo     *bi = oi->oi_orig;
1245         glueinfo *gi;
1246
1247         if ( SLAP_GLUE_SUBORDINATE( be )) {
1248                 Debug( LDAP_DEBUG_ANY, "glue: backend %s is already subordinate, "
1249                         "cannot have glue overlay!\n",
1250                         be->be_suffix[0].bv_val, 0, 0 );
1251                 return LDAP_OTHER;
1252         }
1253
1254         gi = ch_calloc( 1, sizeof(glueinfo));
1255         on->on_bi.bi_private = gi;
1256         dnParent( be->be_nsuffix, &gi->gi_pdn );
1257
1258         /* Currently the overlay framework doesn't handle these entry points
1259          * but we need them....
1260          */
1261         oi->oi_bi.bi_open = glue_open;
1262         oi->oi_bi.bi_close = glue_close;
1263
1264         /* Only advertise these if the root DB supports them */
1265         if ( bi->bi_tool_entry_open )
1266                 oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open;
1267         if ( bi->bi_tool_entry_close )
1268                 oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close;
1269         if ( bi->bi_tool_entry_first )
1270                 oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first;
1271         /* FIXME: check whether all support bi_tool_entry_first_x() ? */
1272         if ( bi->bi_tool_entry_first_x )
1273                 oi->oi_bi.bi_tool_entry_first_x = glue_tool_entry_first_x;
1274         if ( bi->bi_tool_entry_next )
1275                 oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next;
1276         if ( bi->bi_tool_entry_get )
1277                 oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get;
1278         if ( bi->bi_tool_dn2id_get )
1279                 oi->oi_bi.bi_tool_dn2id_get = glue_tool_dn2id_get;
1280         if ( bi->bi_tool_entry_put )
1281                 oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put;
1282         if ( bi->bi_tool_entry_reindex )
1283                 oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex;
1284         if ( bi->bi_tool_entry_modify )
1285                 oi->oi_bi.bi_tool_entry_modify = glue_tool_entry_modify;
1286         if ( bi->bi_tool_sync )
1287                 oi->oi_bi.bi_tool_sync = glue_tool_sync;
1288
1289         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_INSTANCE;
1290
1291         if ( ga_list ) {
1292                 be->bd_info = (BackendInfo *)oi;
1293                 glue_sub_attach( 1 );
1294         }
1295
1296         return 0;
1297 }
1298
1299 static int
1300 glue_db_destroy (
1301         BackendDB *be,
1302         ConfigReply *cr
1303 )
1304 {
1305         slap_overinst   *on = (slap_overinst *)be->bd_info;
1306         glueinfo                *gi = (glueinfo *)on->on_bi.bi_private;
1307
1308         free (gi);
1309         return SLAP_CB_CONTINUE;
1310 }
1311
1312 static int
1313 glue_db_close(
1314         BackendDB *be,
1315         ConfigReply *cr
1316 )
1317 {
1318         slap_overinst   *on = (slap_overinst *)be->bd_info;
1319
1320         on->on_info->oi_bi.bi_db_close = 0;
1321         return 0;
1322 }
1323
1324 int
1325 glue_sub_del( BackendDB *b0 )
1326 {
1327         BackendDB *be;
1328         int rc = 0;
1329
1330         /* Find the top backend for this subordinate */
1331         be = b0;
1332         while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
1333                 slap_overinfo *oi;
1334                 slap_overinst *on;
1335                 glueinfo *gi;
1336                 int i;
1337
1338                 if ( SLAP_GLUE_SUBORDINATE( be ))
1339                         continue;
1340                 if ( !SLAP_GLUE_INSTANCE( be ))
1341                         continue;
1342                 if ( !dnIsSuffix( &b0->be_nsuffix[0], &be->be_nsuffix[0] ))
1343                         continue;
1344
1345                 /* OK, got the right backend, find the overlay */
1346                 oi = (slap_overinfo *)be->bd_info;
1347                 for ( on=oi->oi_list; on; on=on->on_next ) {
1348                         if ( on->on_bi.bi_type == glue.on_bi.bi_type )
1349                                 break;
1350                 }
1351                 assert( on != NULL );
1352                 gi = on->on_bi.bi_private;
1353                 for ( i=0; i < gi->gi_nodes; i++ ) {
1354                         if ( gi->gi_n[i].gn_be == b0 ) {
1355                                 int j;
1356
1357                                 for (j=i+1; j < gi->gi_nodes; j++)
1358                                         gi->gi_n[j-1] = gi->gi_n[j];
1359
1360                                 gi->gi_nodes--;
1361                         }
1362                 }
1363         }
1364         if ( be == NULL )
1365                 rc = LDAP_NO_SUCH_OBJECT;
1366
1367         return rc;
1368 }
1369
1370
1371 /* Attach all the subordinate backends to their superior */
1372 int
1373 glue_sub_attach( int online )
1374 {
1375         glue_Addrec *ga, *gnext = NULL;
1376         int rc = 0;
1377
1378         if ( ga_adding )
1379                 return 0;
1380
1381         ga_adding = 1;
1382
1383         /* For all the subordinate backends */
1384         for ( ga=ga_list; ga != NULL; ga = gnext ) {
1385                 BackendDB *be;
1386
1387                 gnext = ga->ga_next;
1388
1389                 /* Find the top backend for this subordinate */
1390                 be = ga->ga_be;
1391                 while ( (be=LDAP_STAILQ_NEXT( be, be_next )) != NULL ) {
1392                         slap_overinfo *oi;
1393                         slap_overinst *on;
1394                         glueinfo *gi;
1395
1396                         if ( SLAP_GLUE_SUBORDINATE( be ))
1397                                 continue;
1398                         if ( !dnIsSuffix( &ga->ga_be->be_nsuffix[0], &be->be_nsuffix[0] ))
1399                                 continue;
1400
1401                         /* If it's not already configured, set up the overlay */
1402                         if ( !SLAP_GLUE_INSTANCE( be )) {
1403                                 rc = overlay_config( be, glue.on_bi.bi_type, -1, NULL, NULL);
1404                                 if ( rc )
1405                                         break;
1406                         }
1407                         /* Find the overlay instance */
1408                         oi = (slap_overinfo *)be->bd_info;
1409                         for ( on=oi->oi_list; on; on=on->on_next ) {
1410                                 if ( on->on_bi.bi_type == glue.on_bi.bi_type )
1411                                         break;
1412                         }
1413                         assert( on != NULL );
1414                         gi = on->on_bi.bi_private;
1415                         gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) +
1416                                 gi->gi_nodes * sizeof(gluenode));
1417                         gi->gi_n[gi->gi_nodes].gn_be = ga->ga_be;
1418                         dnParent( &ga->ga_be->be_nsuffix[0],
1419                                 &gi->gi_n[gi->gi_nodes].gn_pdn );
1420                         gi->gi_nodes++;
1421                         on->on_bi.bi_private = gi;
1422                         ga->ga_be->be_flags |= SLAP_DBFLAG_GLUE_LINKED;
1423                         break;
1424                 }
1425                 if ( !be ) {
1426                         Debug( LDAP_DEBUG_ANY, "glue: no superior found for sub %s!\n",
1427                                 ga->ga_be->be_suffix[0].bv_val, 0, 0 );
1428                         /* allow this for now, assume a superior will
1429                          * be added later
1430                          */
1431                         if ( online ) {
1432                                 rc = 0;
1433                                 gnext = ga_list;
1434                                 break;
1435                         }
1436                         rc = LDAP_NO_SUCH_OBJECT;
1437                 }
1438                 ch_free( ga );
1439                 if ( rc ) break;
1440         }
1441
1442         ga_list = gnext;
1443
1444         ga_adding = 0;
1445
1446         return rc;
1447 }
1448
1449 int
1450 glue_sub_add( BackendDB *be, int advert, int online )
1451 {
1452         glue_Addrec *ga;
1453         int rc = 0;
1454
1455         if ( overlay_is_inst( be, "glue" )) {
1456                 Debug( LDAP_DEBUG_ANY, "glue: backend %s already has glue overlay, "
1457                         "cannot be a subordinate!\n",
1458                         be->be_suffix[0].bv_val, 0, 0 );
1459                 return LDAP_OTHER;
1460         }
1461         SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_SUBORDINATE;
1462         if ( advert )
1463                 SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLUE_ADVERTISE;
1464
1465         ga = ch_malloc( sizeof( glue_Addrec ));
1466         ga->ga_next = ga_list;
1467         ga->ga_be = be;
1468         ga_list = ga;
1469
1470         if ( online )
1471                 rc = glue_sub_attach( online );
1472
1473         return rc;
1474 }
1475
1476 static int
1477 glue_access_allowed(
1478         Operation               *op,
1479         Entry                   *e,
1480         AttributeDescription    *desc,
1481         struct berval           *val,
1482         slap_access_t           access,
1483         AccessControlState      *state,
1484         slap_mask_t             *maskp )
1485 {
1486         BackendDB *b0, *be = glue_back_select( op->o_bd, &e->e_nname );
1487         int rc;
1488
1489         if ( be == NULL || be == op->o_bd || be->bd_info->bi_access_allowed == NULL )
1490                 return SLAP_CB_CONTINUE;
1491
1492         b0 = op->o_bd;
1493         op->o_bd = be;
1494         rc = be->bd_info->bi_access_allowed ( op, e, desc, val, access, state, maskp );
1495         op->o_bd = b0;
1496         return rc;
1497 }
1498
1499 int
1500 glue_sub_init()
1501 {
1502         glue.on_bi.bi_type = "glue";
1503
1504         glue.on_bi.bi_db_init = glue_db_init;
1505         glue.on_bi.bi_db_close = glue_db_close;
1506         glue.on_bi.bi_db_destroy = glue_db_destroy;
1507
1508         glue.on_bi.bi_op_search = glue_op_search;
1509         glue.on_bi.bi_op_modify = glue_op_func;
1510         glue.on_bi.bi_op_modrdn = glue_op_func;
1511         glue.on_bi.bi_op_add = glue_op_func;
1512         glue.on_bi.bi_op_delete = glue_op_func;
1513         glue.on_bi.bi_extended = glue_op_func;
1514
1515         glue.on_bi.bi_chk_referrals = glue_chk_referrals;
1516         glue.on_bi.bi_chk_controls = glue_chk_controls;
1517         glue.on_bi.bi_entry_get_rw = glue_entry_get_rw;
1518         glue.on_bi.bi_entry_release_rw = glue_entry_release_rw;
1519         glue.on_bi.bi_access_allowed = glue_access_allowed;
1520
1521         glue.on_response = glue_response;
1522
1523         return overlay_register( &glue );
1524 }