git.sur5r.net Git - openldap/blob - servers/slapd/overlays/translucent.c

   1 /* translucent.c - translucent proxy module */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2009 The OpenLDAP Foundation.
   6  * Portions Copyright 2005 Symas Corporation.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by Symas Corp. for inclusion in
  19  * OpenLDAP Software.  This work was sponsored by Hewlett-Packard.
  20  */
  21
  22 #include "portable.h"
  23
  24 #ifdef SLAPD_OVER_TRANSLUCENT
  25
  26 #include <stdio.h>
  27
  28 #include <ac/string.h>
  29 #include <ac/socket.h>
  30
  31 #include "slap.h"
  32 #include "lutil.h"
  33
  34 #include "config.h"
  35
  36 /* config block */
  37 typedef struct translucent_info {
  38         BackendDB db;                   /* captive backend */
  39         AttributeName *local;   /* valid attrs for local filters */
  40         AttributeName *remote;  /* valid attrs for remote filters */
  41         int strict;
  42         int no_glue;
  43         int defer_db_open;
  44         int bind_local;
  45         int pwmod_local;
  46 } translucent_info;
  47
  48 static ConfigLDAPadd translucent_ldadd;
  49 static ConfigCfAdd translucent_cfadd;
  50
  51 static ConfigDriver translucent_cf_gen;
  52
  53 enum {
  54         TRANS_LOCAL = 1,
  55         TRANS_REMOTE
  56 };
  57
  58 static ConfigTable translucentcfg[] = {
  59         { "translucent_strict", "on|off", 1, 2, 0,
  60           ARG_ON_OFF|ARG_OFFSET,
  61           (void *)offsetof(translucent_info, strict),
  62           "( OLcfgOvAt:14.1 NAME 'olcTranslucentStrict' "
  63           "DESC 'Reveal attribute deletion constraint violations' "
  64           "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
  65         { "translucent_no_glue", "on|off", 1, 2, 0,
  66           ARG_ON_OFF|ARG_OFFSET,
  67           (void *)offsetof(translucent_info, no_glue),
  68           "( OLcfgOvAt:14.2 NAME 'olcTranslucentNoGlue' "
  69           "DESC 'Disable automatic glue records for ADD and MODRDN' "
  70           "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
  71         { "translucent_local", "attr[,attr...]", 1, 2, 0,
  72           ARG_MAGIC|TRANS_LOCAL,
  73           translucent_cf_gen,
  74           "( OLcfgOvAt:14.3 NAME 'olcTranslucentLocal' "
  75           "DESC 'Attributes to use in local search filter' "
  76           "SYNTAX OMsDirectoryString )", NULL, NULL },
  77         { "translucent_remote", "attr[,attr...]", 1, 2, 0,
  78           ARG_MAGIC|TRANS_REMOTE,
  79           translucent_cf_gen,
  80           "( OLcfgOvAt:14.4 NAME 'olcTranslucentRemote' "
  81           "DESC 'Attributes to use in remote search filter' "
  82           "SYNTAX OMsDirectoryString )", NULL, NULL },
  83         { "translucent_bind_local", "on|off", 1, 2, 0,
  84           ARG_ON_OFF|ARG_OFFSET,
  85           (void *)offsetof(translucent_info, bind_local),
  86           "( OLcfgOvAt:14.5 NAME 'olcTranslucentBindLocal' "
  87           "DESC 'Enable local bind' "
  88           "SYNTAX OMsBoolean SINGLE-VALUE)", NULL, NULL },
  89         { "translucent_pwmod_local", "on|off", 1, 2, 0,
  90           ARG_ON_OFF|ARG_OFFSET,
  91           (void *)offsetof(translucent_info, pwmod_local),
  92           "( OLcfgOvAt:14.6 NAME 'olcTranslucentPwModLocal' "
  93           "DESC 'Enable local RFC 3062 Password Modify extended operation' "
  94           "SYNTAX OMsBoolean SINGLE-VALUE)", NULL, NULL },
  95         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
  96 };
  97
  98 static ConfigOCs translucentocs[] = {
  99         { "( OLcfgOvOc:14.1 "
 100           "NAME 'olcTranslucentConfig' "
 101           "DESC 'Translucent configuration' "
 102           "SUP olcOverlayConfig "
 103           "MAY ( olcTranslucentStrict $ olcTranslucentNoGlue $"
 104           " olcTranslucentLocal $ olcTranslucentRemote $"
 105           " olcTranslucentBindLocal $ olcTranslucentPwModLocal ) )",
 106           Cft_Overlay, translucentcfg, NULL, translucent_cfadd },
 107         { "( OLcfgOvOc:14.2 "
 108           "NAME 'olcTranslucentDatabase' "
 109           "DESC 'Translucent target database configuration' "
 110           "AUXILIARY )", Cft_Misc, olcDatabaseDummy, translucent_ldadd },
 111         { NULL, 0, NULL }
 112 };
 113 /* for translucent_init() */
 114
 115 static int
 116 translucent_ldadd_cleanup( ConfigArgs *ca )
 117 {
 118         slap_overinst *on = ca->ca_private;
 119         translucent_info *ov = on->on_bi.bi_private;
 120
 121         ov->defer_db_open = 0;
 122         return backend_startup_one( ca->be, &ca->reply );
 123 }
 124
 125 static int
 126 translucent_ldadd( CfEntryInfo *cei, Entry *e, ConfigArgs *ca )
 127 {
 128         slap_overinst *on;
 129         translucent_info *ov;
 130
 131         Debug(LDAP_DEBUG_TRACE, "==> translucent_ldadd\n", 0, 0, 0);
 132
 133         if ( cei->ce_type != Cft_Overlay || !cei->ce_bi ||
 134              cei->ce_bi->bi_cf_ocs != translucentocs )
 135                 return LDAP_CONSTRAINT_VIOLATION;
 136
 137         on = (slap_overinst *)cei->ce_bi;
 138         ov = on->on_bi.bi_private;
 139         ca->be = &ov->db;
 140         ca->ca_private = on;
 141         if ( CONFIG_ONLINE_ADD( ca ))
 142                 ca->cleanup = translucent_ldadd_cleanup;
 143         else
 144                 ov->defer_db_open = 0;
 145
 146         return LDAP_SUCCESS;
 147 }
 148
 149 static int
 150 translucent_cfadd( Operation *op, SlapReply *rs, Entry *e, ConfigArgs *ca )
 151 {
 152         CfEntryInfo *cei = e->e_private;
 153         slap_overinst *on = (slap_overinst *)cei->ce_bi;
 154         translucent_info *ov = on->on_bi.bi_private;
 155         struct berval bv;
 156
 157         Debug(LDAP_DEBUG_TRACE, "==> translucent_cfadd\n", 0, 0, 0);
 158
 159         /* FIXME: should not hardcode "olcDatabase" here */
 160         bv.bv_len = snprintf( ca->cr_msg, sizeof( ca->cr_msg ),
 161                 "olcDatabase=%s", ov->db.bd_info->bi_type );
 162         if ( bv.bv_len >= sizeof( ca->cr_msg ) ) {
 163                 return -1;
 164         }
 165         bv.bv_val = ca->cr_msg;
 166         ca->be = &ov->db;
 167         ov->defer_db_open = 0;
 168
 169         /* We can only create this entry if the database is table-driven
 170          */
 171         if ( ov->db.bd_info->bi_cf_ocs )
 172                 config_build_entry( op, rs, cei, ca, &bv,
 173                                     ov->db.bd_info->bi_cf_ocs,
 174                                     &translucentocs[1] );
 175
 176         return 0;
 177 }
 178
 179 static int
 180 translucent_cf_gen( ConfigArgs *c )
 181 {
 182         slap_overinst   *on = (slap_overinst *)c->bi;
 183         translucent_info *ov = on->on_bi.bi_private;
 184         AttributeName **an, *a2;
 185         int i;
 186
 187         if ( c->type == TRANS_LOCAL )
 188                 an = &ov->local;
 189         else
 190                 an = &ov->remote;
 191
 192         if ( c->op == SLAP_CONFIG_EMIT ) {
 193                 if ( !*an )
 194                         return 1;
 195                 for ( i = 0; !BER_BVISNULL(&(*an)[i].an_name); i++ ) {
 196                         value_add_one( &c->rvalue_vals, &(*an)[i].an_name );
 197                 }
 198                 return ( i < 1 );
 199         } else if ( c->op == LDAP_MOD_DELETE ) {
 200                 if ( c->valx < 0 ) {
 201                         anlist_free( *an, 1, NULL );
 202                         *an = NULL;
 203                 } else {
 204                         i = c->valx;
 205                         ch_free( (*an)[i].an_name.bv_val );
 206                         do {
 207                                 (*an)[i] = (*an)[i+1];
 208                         } while ( !BER_BVISNULL( &(*an)[i].an_name ));
 209                 }
 210                 return 0;
 211         }
 212         a2 = str2anlist( *an, c->argv[1], "," );
 213         if ( !a2 ) {
 214                 snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse attribute %s",
 215                         c->argv[0], c->argv[1] );
 216                 Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
 217                         "%s: %s\n", c->log, c->cr_msg, 0 );
 218                 return ARG_BAD_CONF;
 219         }
 220         *an = a2;
 221         return 0;
 222 }
 223
 224 static slap_overinst translucent;
 225
 226 /*
 227 ** glue_parent()
 228 **      call syncrepl_add_glue() with the parent suffix;
 229 **
 230 */
 231
 232 static struct berval glue[] = { BER_BVC("top"), BER_BVC("glue"), BER_BVNULL };
 233
 234 void glue_parent(Operation *op) {
 235         Operation nop = *op;
 236         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 237         struct berval ndn = BER_BVNULL;
 238         Attribute *a;
 239         Entry *e;
 240         struct berval   pdn;
 241
 242         dnParent( &op->o_req_ndn, &pdn );
 243         ber_dupbv_x( &ndn, &pdn, op->o_tmpmemctx );
 244
 245         Debug(LDAP_DEBUG_TRACE, "=> glue_parent: fabricating glue for <%s>\n", ndn.bv_val, 0, 0);
 246
 247         e = entry_alloc();
 248         e->e_id = NOID;
 249         ber_dupbv(&e->e_name, &ndn);
 250         ber_dupbv(&e->e_nname, &ndn);
 251
 252         a = attr_alloc( slap_schema.si_ad_objectClass );
 253         a->a_numvals = 2;
 254         a->a_vals = ch_malloc(sizeof(struct berval) * 3);
 255         ber_dupbv(&a->a_vals[0], &glue[0]);
 256         ber_dupbv(&a->a_vals[1], &glue[1]);
 257         ber_dupbv(&a->a_vals[2], &glue[2]);
 258         a->a_nvals = a->a_vals;
 259         a->a_next = e->e_attrs;
 260         e->e_attrs = a;
 261
 262         a = attr_alloc( slap_schema.si_ad_structuralObjectClass );
 263         a->a_numvals = 1;
 264         a->a_vals = ch_malloc(sizeof(struct berval) * 2);
 265         ber_dupbv(&a->a_vals[0], &glue[1]);
 266         ber_dupbv(&a->a_vals[1], &glue[2]);
 267         a->a_nvals = a->a_vals;
 268         a->a_next = e->e_attrs;
 269         e->e_attrs = a;
 270
 271         nop.o_req_dn = ndn;
 272         nop.o_req_ndn = ndn;
 273         nop.ora_e = e;
 274
 275         nop.o_bd->bd_info = (BackendInfo *) on->on_info->oi_orig;
 276         syncrepl_add_glue(&nop, e);
 277         nop.o_bd->bd_info = (BackendInfo *) on;
 278
 279         op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
 280
 281         return;
 282 }
 283
 284 /*
 285 ** free_attr_chain()
 286 **      free only the Attribute*, not the contents;
 287 **
 288 */
 289 void free_attr_chain(Attribute *b) {
 290         Attribute *a;
 291         for(a=b; a; a=a->a_next) {
 292                 a->a_vals = NULL;
 293                 a->a_nvals = NULL;
 294         }
 295         attrs_free( b );
 296         return;
 297 }
 298
 299 /*
 300 ** translucent_add()
 301 **      if not bound as root, send ACCESS error;
 302 **      if glue, glue_parent();
 303 **      return CONTINUE;
 304 **
 305 */
 306
 307 static int translucent_add(Operation *op, SlapReply *rs) {
 308         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 309         translucent_info *ov = on->on_bi.bi_private;
 310         Debug(LDAP_DEBUG_TRACE, "==> translucent_add: %s\n",
 311                 op->o_req_dn.bv_val, 0, 0);
 312         if(!be_isroot(op)) {
 313                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 314                 send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
 315                         "user modification of overlay database not permitted");
 316                 op->o_bd->bd_info = (BackendInfo *) on;
 317                 return(rs->sr_err);
 318         }
 319         if(!ov->no_glue) glue_parent(op);
 320         return(SLAP_CB_CONTINUE);
 321 }
 322
 323 /*
 324 ** translucent_modrdn()
 325 **      if not bound as root, send ACCESS error;
 326 **      if !glue, glue_parent();
 327 **      else return CONTINUE;
 328 **
 329 */
 330
 331 static int translucent_modrdn(Operation *op, SlapReply *rs) {
 332         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 333         translucent_info *ov = on->on_bi.bi_private;
 334         Debug(LDAP_DEBUG_TRACE, "==> translucent_modrdn: %s -> %s\n",
 335                 op->o_req_dn.bv_val, op->orr_newrdn.bv_val, 0);
 336         if(!be_isroot(op)) {
 337                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 338                 send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
 339                         "user modification of overlay database not permitted");
 340                 op->o_bd->bd_info = (BackendInfo *) on;
 341                 return(rs->sr_err);
 342         }
 343         if(!ov->no_glue) {
 344                 op->o_tag = LDAP_REQ_ADD;
 345                 glue_parent(op);
 346                 op->o_tag = LDAP_REQ_MODRDN;
 347         }
 348         return(SLAP_CB_CONTINUE);
 349 }
 350
 351 /*
 352 ** translucent_delete()
 353 **      if not bound as root, send ACCESS error;
 354 **      else return CONTINUE;
 355 **
 356 */
 357
 358 static int translucent_delete(Operation *op, SlapReply *rs) {
 359         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 360         Debug(LDAP_DEBUG_TRACE, "==> translucent_delete: %s\n",
 361                 op->o_req_dn.bv_val, 0, 0);
 362         if(!be_isroot(op)) {
 363                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 364                 send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
 365                         "user modification of overlay database not permitted");
 366                 op->o_bd->bd_info = (BackendInfo *) on;
 367                 return(rs->sr_err);
 368         }
 369         return(SLAP_CB_CONTINUE);
 370 }
 371
 372 static int
 373 translucent_tag_cb( Operation *op, SlapReply *rs )
 374 {
 375         op->o_tag = LDAP_REQ_MODIFY;
 376         op->orm_modlist = op->o_callback->sc_private;
 377         rs->sr_tag = slap_req2res( op->o_tag );
 378
 379         return SLAP_CB_CONTINUE;
 380 }
 381
 382 /*
 383 ** translucent_modify()
 384 **      modify in local backend if exists in both;
 385 **      otherwise, add to local backend;
 386 **      fail if not defined in captive backend;
 387 **
 388 */
 389
 390 static int translucent_modify(Operation *op, SlapReply *rs) {
 391         SlapReply nrs = { REP_RESULT };
 392
 393         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 394         translucent_info *ov = on->on_bi.bi_private;
 395         Entry *e = NULL, *re = NULL;
 396         Attribute *a, *ax;
 397         Modifications *m, **mm;
 398         BackendDB *db;
 399         int del, rc, erc = 0;
 400         slap_callback cb = { 0 };
 401
 402         Debug(LDAP_DEBUG_TRACE, "==> translucent_modify: %s\n",
 403                 op->o_req_dn.bv_val, 0, 0);
 404
 405         if(ov->defer_db_open) {
 406                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 407                         "remote DB not available");
 408                 return(rs->sr_err);
 409         }
 410 /*
 411 ** fetch entry from the captive backend;
 412 ** if it did not exist, fail;
 413 ** release it, if captive backend supports this;
 414 **
 415 */
 416
 417         db = op->o_bd;
 418         op->o_bd = &ov->db;
 419         ov->db.be_acl = op->o_bd->be_acl;
 420         rc = ov->db.bd_info->bi_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &re);
 421         if(rc != LDAP_SUCCESS || re == NULL ) {
 422                 send_ldap_error((op), rs, LDAP_NO_SUCH_OBJECT,
 423                         "attempt to modify nonexistent local record");
 424                 return(rs->sr_err);
 425         }
 426         op->o_bd = db;
 427 /*
 428 ** fetch entry from local backend;
 429 ** if it exists:
 430 **      foreach Modification:
 431 **          if attr not present in local:
 432 **              if Mod == LDAP_MOD_DELETE:
 433 **                  if remote attr not present, return NO_SUCH;
 434 **                  if remote attr present, drop this Mod;
 435 **              else force this Mod to LDAP_MOD_ADD;
 436 **      return CONTINUE;
 437 **
 438 */
 439
 440         op->o_bd->bd_info = (BackendInfo *) on->on_info;
 441         rc = be_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &e);
 442         op->o_bd->bd_info = (BackendInfo *) on;
 443
 444         if(e && rc == LDAP_SUCCESS) {
 445                 Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: found local entry\n", 0, 0, 0);
 446                 for(mm = &op->orm_modlist; *mm; ) {
 447                         m = *mm;
 448                         for(a = e->e_attrs; a; a = a->a_next)
 449                                 if(a->a_desc == m->sml_desc) break;
 450                         if(a) {
 451                                 mm = &m->sml_next;
 452                                 continue;               /* found local attr */
 453                         }
 454                         if(m->sml_op == LDAP_MOD_DELETE) {
 455                                 for(a = re->e_attrs; a; a = a->a_next)
 456                                         if(a->a_desc == m->sml_desc) break;
 457                                 /* not found remote attr */
 458                                 if(!a) {
 459                                         erc = LDAP_NO_SUCH_ATTRIBUTE;
 460                                         goto release;
 461                                 }
 462                                 if(ov->strict) {
 463                                         erc = LDAP_CONSTRAINT_VIOLATION;
 464                                         goto release;
 465                                 }
 466                                 Debug(LDAP_DEBUG_TRACE,
 467                                         "=> translucent_modify: silently dropping delete: %s\n",
 468                                         m->sml_desc->ad_cname.bv_val, 0, 0);
 469                                 *mm = m->sml_next;
 470                                 m->sml_next = NULL;
 471                                 slap_mods_free(m, 1);
 472                                 continue;
 473                         }
 474                         m->sml_op = LDAP_MOD_ADD;
 475                         mm = &m->sml_next;
 476                 }
 477                 erc = SLAP_CB_CONTINUE;
 478 release:
 479                 if(re) {
 480                         if(ov->db.bd_info->bi_entry_release_rw) {
 481                                 op->o_bd = &ov->db;
 482                                 ov->db.bd_info->bi_entry_release_rw(op, re, 0);
 483                                 op->o_bd = db;
 484                         } else
 485                                 entry_free(re);
 486                 }
 487                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 488                 be_entry_release_r(op, e);
 489                 op->o_bd->bd_info = (BackendInfo *) on;
 490                 if(erc == SLAP_CB_CONTINUE) {
 491                         return(erc);
 492                 } else if(erc) {
 493                         send_ldap_error(op, rs, erc,
 494                                 "attempt to delete nonexistent attribute");
 495                         return(erc);
 496                 }
 497         }
 498
 499         /* don't leak remote entry copy */
 500         if(re) {
 501                 if(ov->db.bd_info->bi_entry_release_rw) {
 502                         op->o_bd = &ov->db;
 503                         ov->db.bd_info->bi_entry_release_rw(op, re, 0);
 504                         op->o_bd = db;
 505                 } else
 506                         entry_free(re);
 507         }
 508 /*
 509 ** foreach Modification:
 510 **      if MOD_ADD or MOD_REPLACE, add Attribute;
 511 ** if no Modifications were suitable:
 512 **      if strict, throw CONSTRAINT_VIOLATION;
 513 **      else, return early SUCCESS;
 514 ** fabricate Entry with new Attribute chain;
 515 ** glue_parent() for this Entry;
 516 ** call bi_op_add() in local backend;
 517 **
 518 */
 519
 520         Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: fabricating local add\n", 0, 0, 0);
 521         a = NULL;
 522         for(del = 0, ax = NULL, m = op->orm_modlist; m; m = m->sml_next) {
 523                 Attribute atmp;
 524                 if(((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_ADD) &&
 525                    ((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_REPLACE)) {
 526                         Debug(LDAP_DEBUG_ANY,
 527                                 "=> translucent_modify: silently dropped modification(%d): %s\n",
 528                                 m->sml_op, m->sml_desc->ad_cname.bv_val, 0);
 529                         if((m->sml_op & LDAP_MOD_OP) == LDAP_MOD_DELETE) del++;
 530                         continue;
 531                 }
 532                 atmp.a_desc = m->sml_desc;
 533                 atmp.a_vals = m->sml_values;
 534                 atmp.a_nvals = m->sml_nvalues ? m->sml_nvalues : atmp.a_vals;
 535                 atmp.a_numvals = m->sml_numvals;
 536                 atmp.a_flags = 0;
 537                 a = attr_dup( &atmp );
 538                 a->a_next  = ax;
 539                 ax = a;
 540         }
 541
 542         if(del && ov->strict) {
 543                 attrs_free( a );
 544                 send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
 545                         "attempt to delete attributes from local database");
 546                 return(rs->sr_err);
 547         }
 548
 549         if(!ax) {
 550                 if(ov->strict) {
 551                         send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
 552                                 "modification contained other than ADD or REPLACE");
 553                         return(rs->sr_err);
 554                 }
 555                 /* rs->sr_text = "no valid modification found"; */
 556                 rs->sr_err = LDAP_SUCCESS;
 557                 send_ldap_result(op, rs);
 558                 return(rs->sr_err);
 559         }
 560
 561         e = entry_alloc();
 562         ber_dupbv( &e->e_name, &op->o_req_dn );
 563         ber_dupbv( &e->e_nname, &op->o_req_ndn );
 564         e->e_attrs = a;
 565
 566         op->o_tag       = LDAP_REQ_ADD;
 567         cb.sc_response = translucent_tag_cb;
 568         cb.sc_private = op->orm_modlist;
 569         op->oq_add.rs_e = e;
 570
 571         glue_parent(op);
 572
 573         cb.sc_next = op->o_callback;
 574         op->o_callback = &cb;
 575         rc = on->on_info->oi_orig->bi_op_add(op, &nrs);
 576         if ( op->ora_e == e )
 577                 entry_free( e );
 578         op->o_callback = cb.sc_next;
 579
 580         return(rc);
 581 }
 582
 583 static int translucent_compare(Operation *op, SlapReply *rs) {
 584         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 585         translucent_info *ov = on->on_bi.bi_private;
 586         AttributeAssertion *ava = op->orc_ava;
 587         Entry *e;
 588         BackendDB *db;
 589         int rc;
 590
 591         Debug(LDAP_DEBUG_TRACE, "==> translucent_compare: <%s> %s:%s\n",
 592                 op->o_req_dn.bv_val, ava->aa_desc->ad_cname.bv_val, ava->aa_value.bv_val);
 593
 594 /*
 595 ** if the local backend has an entry for this attribute:
 596 **      CONTINUE and let it do the compare;
 597 **
 598 */
 599         rc = overlay_entry_get_ov(op, &op->o_req_ndn, NULL, ava->aa_desc, 0, &e, on);
 600         if(rc == LDAP_SUCCESS && e) {
 601                 overlay_entry_release_ov(op, e, 0, on);
 602                 return(SLAP_CB_CONTINUE);
 603         }
 604
 605         if(ov->defer_db_open) {
 606                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 607                         "remote DB not available");
 608                 return(rs->sr_err);
 609         }
 610 /*
 611 ** call compare() in the captive backend;
 612 ** return the result;
 613 **
 614 */
 615         db = op->o_bd;
 616         op->o_bd = &ov->db;
 617         ov->db.be_acl = op->o_bd->be_acl;
 618         rc = ov->db.bd_info->bi_op_compare(op, rs);
 619         op->o_bd = db;
 620
 621         return(rc);
 622 }
 623
 624 static int translucent_pwmod(Operation *op, SlapReply *rs) {
 625         SlapReply nrs = { REP_RESULT };
 626         Operation nop;
 627
 628         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 629         translucent_info *ov = on->on_bi.bi_private;
 630         const struct berval bv_exop_pwmod = BER_BVC(LDAP_EXOP_MODIFY_PASSWD);
 631         Entry *e = NULL, *re = NULL;
 632         BackendDB *db;
 633         int rc = 0;
 634         slap_callback cb = { 0 };
 635
 636         if (!ov->pwmod_local) {
 637                 rs->sr_err = LDAP_CONSTRAINT_VIOLATION,
 638                 rs->sr_text = "attempt to modify password in local database";
 639                 return rs->sr_err;
 640         }
 641
 642 /*
 643 ** fetch entry from the captive backend;
 644 ** if it did not exist, fail;
 645 ** release it, if captive backend supports this;
 646 **
 647 */
 648         db = op->o_bd;
 649         op->o_bd = &ov->db;
 650         ov->db.be_acl = op->o_bd->be_acl;
 651         rc = ov->db.bd_info->bi_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &re);
 652         if(rc != LDAP_SUCCESS || re == NULL ) {
 653                 send_ldap_error((op), rs, LDAP_NO_SUCH_OBJECT,
 654                         "attempt to modify nonexistent local record");
 655                 return(rs->sr_err);
 656         }
 657         op->o_bd = db;
 658 /*
 659 ** fetch entry from local backend;
 660 ** if it exists:
 661 **      return CONTINUE;
 662 */
 663
 664         op->o_bd->bd_info = (BackendInfo *) on->on_info;
 665         rc = be_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &e);
 666         op->o_bd->bd_info = (BackendInfo *) on;
 667
 668         if(e && rc == LDAP_SUCCESS) {
 669                 if(re) {
 670                         if(ov->db.bd_info->bi_entry_release_rw) {
 671                                 op->o_bd = &ov->db;
 672                                 ov->db.bd_info->bi_entry_release_rw(op, re, 0);
 673                                 op->o_bd = db;
 674                         } else {
 675                                 entry_free(re);
 676                         }
 677                 }
 678                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 679                 be_entry_release_r(op, e);
 680                 op->o_bd->bd_info = (BackendInfo *) on;
 681                 return SLAP_CB_CONTINUE;
 682         }
 683
 684         /* don't leak remote entry copy */
 685         if(re) {
 686                 if(ov->db.bd_info->bi_entry_release_rw) {
 687                         op->o_bd = &ov->db;
 688                         ov->db.bd_info->bi_entry_release_rw(op, re, 0);
 689                         op->o_bd = db;
 690                 } else {
 691                         entry_free(re);
 692                 }
 693         }
 694 /*
 695 ** glue_parent() for this Entry;
 696 ** call bi_op_add() in local backend;
 697 **
 698 */
 699         e = entry_alloc();
 700         ber_dupbv( &e->e_name, &op->o_req_dn );
 701         ber_dupbv( &e->e_nname, &op->o_req_ndn );
 702         e->e_attrs = NULL;
 703
 704         nop = *op;
 705         nop.o_tag = LDAP_REQ_ADD;
 706         cb.sc_response = slap_null_cb;
 707         nop.oq_add.rs_e = e;
 708
 709         glue_parent(&nop);
 710
 711         nop.o_callback = &cb;
 712         rc = on->on_info->oi_orig->bi_op_add(&nop, &nrs);
 713         if ( nop.ora_e == e ) {
 714                 entry_free( e );
 715         }
 716
 717         if ( rc == LDAP_SUCCESS ) {
 718                 return SLAP_CB_CONTINUE;
 719         }
 720
 721         return rc;
 722 }
 723
 724 static int translucent_exop(Operation *op, SlapReply *rs) {
 725         SlapReply nrs = { REP_RESULT };
 726
 727         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 728         translucent_info *ov = on->on_bi.bi_private;
 729         const struct berval bv_exop_pwmod = BER_BVC(LDAP_EXOP_MODIFY_PASSWD);
 730
 731         Debug(LDAP_DEBUG_TRACE, "==> translucent_exop: %s\n",
 732                 op->o_req_dn.bv_val, 0, 0);
 733
 734         if(ov->defer_db_open) {
 735                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 736                         "remote DB not available");
 737                 return(rs->sr_err);
 738         }
 739
 740         if ( bvmatch( &bv_exop_pwmod, &op->ore_reqoid ) ) {
 741                 return translucent_pwmod( op, rs );
 742         }
 743
 744         return SLAP_CB_CONTINUE;
 745 }
 746
 747 /*
 748 ** translucent_search_cb()
 749 **      merge local data with remote data
 750 **
 751 ** Four cases:
 752 ** 1: remote search, no local filter
 753 **      merge data and send immediately
 754 ** 2: remote search, with local filter
 755 **      merge data and save
 756 ** 3: local search, no remote filter
 757 **      merge data and send immediately
 758 ** 4: local search, with remote filter
 759 **      check list, merge, send, delete
 760 */
 761
 762 #define RMT_SIDE        0
 763 #define LCL_SIDE        1
 764 #define USE_LIST        2
 765
 766 typedef struct trans_ctx {
 767         BackendDB *db;
 768         slap_overinst *on;
 769         Filter *orig;
 770         Avlnode *list;
 771         int step;
 772         int slimit;
 773 } trans_ctx;
 774
 775 static int translucent_search_cb(Operation *op, SlapReply *rs) {
 776         trans_ctx *tc;
 777         BackendDB *db;
 778         slap_overinst *on;
 779         translucent_info *ov;
 780         Entry *le, *re;
 781         Attribute *a, *ax, *an, *as = NULL;
 782         int rc;
 783         int test_f = 0;
 784
 785         tc = op->o_callback->sc_private;
 786
 787         /* Don't let the op complete while we're gathering data */
 788         if ( rs->sr_type == REP_RESULT && ( tc->step & USE_LIST ))
 789                 return 0;
 790
 791         if(!op || !rs || rs->sr_type != REP_SEARCH || !rs->sr_entry)
 792                 return(SLAP_CB_CONTINUE);
 793
 794         Debug(LDAP_DEBUG_TRACE, "==> translucent_search_cb: %s\n",
 795                 rs->sr_entry->e_name.bv_val, 0, 0);
 796
 797         op->ors_slimit = tc->slimit + ( tc->slimit > 0 ? 1 : 0 );
 798
 799         on = tc->on;
 800         ov = on->on_bi.bi_private;
 801
 802         db = op->o_bd;
 803         re = NULL;
 804
 805         /* If we have local, get remote */
 806         if ( tc->step & LCL_SIDE ) {
 807                 le = rs->sr_entry;
 808                 /* If entry is already on list, use it */
 809                 if ( tc->step & USE_LIST ) {
 810                         re = tavl_delete( &tc->list, le, entry_dn_cmp );
 811                         if ( re ) {
 812                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
 813                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
 814                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
 815                                 }
 816                                 if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
 817                                         rs->sr_flags ^= REP_ENTRY_MUSTBEFREED;
 818                                         entry_free( rs->sr_entry );
 819                                 }
 820                                 rc = test_filter( op, re, tc->orig );
 821                                 if ( rc == LDAP_COMPARE_TRUE ) {
 822                                         rs->sr_flags |= REP_ENTRY_MUSTBEFREED;
 823                                         rs->sr_entry = re;
 824
 825                                         if ( tc->slimit >= 0 && rs->sr_nentries >= tc->slimit ) {
 826                                                 return LDAP_SIZELIMIT_EXCEEDED;
 827                                         }
 828
 829                                         return SLAP_CB_CONTINUE;
 830                                 } else {
 831                                         entry_free( re );
 832                                         rs->sr_entry = NULL;
 833                                         return 0;
 834                                 }
 835                         }
 836                 }
 837                 op->o_bd = &ov->db;
 838                 rc = be_entry_get_rw( op, &rs->sr_entry->e_nname, NULL, NULL, 0, &re );
 839                 if ( rc == LDAP_SUCCESS && re ) {
 840                         Entry *tmp = entry_dup( re );
 841                         be_entry_release_r( op, re );
 842                         re = tmp;
 843                         test_f = 1;
 844                 }
 845         } else {
 846         /* Else we have remote, get local */
 847                 op->o_bd = tc->db;
 848                 rc = overlay_entry_get_ov(op, &rs->sr_entry->e_nname, NULL, NULL, 0, &le, on);
 849                 if ( rc == LDAP_SUCCESS && le ) {
 850                         re = entry_dup( rs->sr_entry );
 851                         if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
 852                                 rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
 853                                 overlay_entry_release_ov( op, rs->sr_entry, 0, on );
 854                         }
 855                         if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
 856                                 rs->sr_flags ^= REP_ENTRY_MUSTBEFREED;
 857                                 entry_free( rs->sr_entry );
 858                         }
 859                 } else {
 860                         le = NULL;
 861                 }
 862         }
 863
 864 /*
 865 ** if we got remote and local entry:
 866 **      foreach local attr:
 867 **              foreach remote attr:
 868 **                      if match, remote attr with local attr;
 869 **                      if new local, add to list;
 870 **      append new local attrs to remote;
 871 **
 872 */
 873
 874         if ( re && le ) {
 875                 for(ax = le->e_attrs; ax; ax = ax->a_next) {
 876                         for(a = re->e_attrs; a; a = a->a_next) {
 877                                 if(a->a_desc == ax->a_desc) {
 878                                         test_f = 1;
 879                                         if(a->a_vals != a->a_nvals)
 880                                                 ber_bvarray_free(a->a_nvals);
 881                                         ber_bvarray_free(a->a_vals);
 882                                         ber_bvarray_dup_x( &a->a_vals, ax->a_vals, NULL );
 883                                         if ( ax->a_vals == ax->a_nvals ) {
 884                                                 a->a_nvals = a->a_vals;
 885                                         } else {
 886                                                 ber_bvarray_dup_x( &a->a_nvals, ax->a_nvals, NULL );
 887                                         }
 888                                         break;
 889                                 }
 890                         }
 891                         if(a) continue;
 892                         an = attr_dup(ax);
 893                         an->a_next = as;
 894                         as = an;
 895                 }
 896                 /* Dispose of local entry */
 897                 if ( tc->step & LCL_SIDE ) {
 898                         if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
 899                                 rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
 900                                 overlay_entry_release_ov( op, rs->sr_entry, 0, on );
 901                         }
 902                         if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
 903                                 rs->sr_flags ^= REP_ENTRY_MUSTBEFREED;
 904                                 entry_free( rs->sr_entry );
 905                         }
 906                 } else {
 907                         overlay_entry_release_ov(op, le, 0, on);
 908                 }
 909
 910                 /* literally append, so locals are always last */
 911                 if(as) {
 912                         if(re->e_attrs) {
 913                                 for(ax = re->e_attrs; ax->a_next; ax = ax->a_next);
 914                                 ax->a_next = as;
 915                         } else {
 916                                 re->e_attrs = as;
 917                         }
 918                 }
 919                 /* If both filters, save entry for later */
 920                 if ( tc->step == (USE_LIST|RMT_SIDE) ) {
 921                         tavl_insert( &tc->list, re, entry_dn_cmp, avl_dup_error );
 922                         rs->sr_entry = NULL;
 923                         rc = 0;
 924                 } else {
 925                 /* send it now */
 926                         rs->sr_entry = re;
 927                         rs->sr_flags |= REP_ENTRY_MUSTBEFREED;
 928                         if ( test_f ) {
 929                                 rc = test_filter( op, rs->sr_entry, tc->orig );
 930                                 if ( rc == LDAP_COMPARE_TRUE ) {
 931                                         rc = SLAP_CB_CONTINUE;
 932                                 } else {
 933                                         rc = 0;
 934                                 }
 935                         } else {
 936                                 rc = SLAP_CB_CONTINUE;
 937                         }
 938                 }
 939         } else if ( le ) {
 940         /* Only a local entry: remote was deleted
 941          * Ought to delete the local too...
 942          */
 943                 rc = 0;
 944         } else if ( tc->step & USE_LIST ) {
 945         /* Only a remote entry, but both filters:
 946          * Test the complete filter
 947          */
 948                 rc = test_filter( op, rs->sr_entry, tc->orig );
 949                 if ( rc == LDAP_COMPARE_TRUE ) {
 950                         rc = SLAP_CB_CONTINUE;
 951                 } else {
 952                         rc = 0;
 953                 }
 954         } else {
 955         /* Only a remote entry, only remote filter:
 956          * just pass thru
 957          */
 958                 rc = SLAP_CB_CONTINUE;
 959         }
 960
 961         op->o_bd = db;
 962
 963         if ( rc == SLAP_CB_CONTINUE && tc->slimit >= 0 && rs->sr_nentries >= tc->slimit ) {
 964                 return LDAP_SIZELIMIT_EXCEEDED;
 965         }
 966
 967         return rc;
 968 }
 969
 970 /* Dup the filter, excluding invalid elements */
 971 static Filter *
 972 trans_filter_dup(Operation *op, Filter *f, AttributeName *an)
 973 {
 974         Filter *n = NULL;
 975
 976         if ( !f )
 977                 return NULL;
 978
 979         switch( f->f_choice & SLAPD_FILTER_MASK ) {
 980         case SLAPD_FILTER_COMPUTED:
 981                 n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
 982                 n->f_choice = f->f_choice;
 983                 n->f_result = f->f_result;
 984                 n->f_next = NULL;
 985                 break;
 986
 987         case LDAP_FILTER_PRESENT:
 988                 if ( ad_inlist( f->f_desc, an )) {
 989                         n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
 990                         n->f_choice = f->f_choice;
 991                         n->f_desc = f->f_desc;
 992                         n->f_next = NULL;
 993                 }
 994                 break;
 995
 996         case LDAP_FILTER_EQUALITY:
 997         case LDAP_FILTER_GE:
 998         case LDAP_FILTER_LE:
 999         case LDAP_FILTER_APPROX:
1000         case LDAP_FILTER_SUBSTRINGS:
1001         case LDAP_FILTER_EXT:
1002                 if ( !f->f_av_desc || ad_inlist( f->f_av_desc, an )) {
1003                         n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1004                         n->f_choice = f->f_choice;
1005                         n->f_ava = f->f_ava;
1006                         n->f_next = NULL;
1007                 }
1008                 break;
1009
1010         case LDAP_FILTER_AND:
1011         case LDAP_FILTER_OR:
1012         case LDAP_FILTER_NOT: {
1013                 Filter **p;
1014
1015                 n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1016                 n->f_choice = f->f_choice;
1017                 n->f_next = NULL;
1018
1019                 for ( p = &n->f_list, f = f->f_list; f; f = f->f_next ) {
1020                         *p = trans_filter_dup( op, f, an );
1021                         if ( !*p )
1022                                 continue;
1023                         p = &(*p)->f_next;
1024                 }
1025                 /* nothing valid in this list */
1026                 if ( !n->f_list ) {
1027                         op->o_tmpfree( n, op->o_tmpmemctx );
1028                         return NULL;
1029                 }
1030                 /* Only 1 element in this list */
1031                 if ((n->f_choice & SLAPD_FILTER_MASK) != LDAP_FILTER_NOT &&
1032                         !n->f_list->f_next ) {
1033                         f = n->f_list;
1034                         *n = *f;
1035                         op->o_tmpfree( f, op->o_tmpmemctx );
1036                 }
1037                 break;
1038         }
1039         }
1040         return n;
1041 }
1042
1043 static void
1044 trans_filter_free( Operation *op, Filter *f )
1045 {
1046         Filter *n, *p, *next;
1047
1048         f->f_choice &= SLAPD_FILTER_MASK;
1049
1050         switch( f->f_choice ) {
1051         case LDAP_FILTER_AND:
1052         case LDAP_FILTER_OR:
1053         case LDAP_FILTER_NOT:
1054                 /* Free in reverse order */
1055                 n = NULL;
1056                 for ( p = f->f_list; p; p = next ) {
1057                         next = p->f_next;
1058                         p->f_next = n;
1059                         n = p;
1060                 }
1061                 for ( p = n; p; p = next ) {
1062                         next = p->f_next;
1063                         trans_filter_free( op, p );
1064                 }
1065                 break;
1066         default:
1067                 break;
1068         }
1069         op->o_tmpfree( f, op->o_tmpmemctx );
1070 }
1071
1072 /*
1073 ** translucent_search()
1074 **      search via captive backend;
1075 **      override results with any local data;
1076 **
1077 */
1078
1079 static int translucent_search(Operation *op, SlapReply *rs) {
1080         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
1081         translucent_info *ov = on->on_bi.bi_private;
1082         slap_callback cb = { NULL, NULL, NULL, NULL };
1083         trans_ctx tc;
1084         Filter *fl, *fr;
1085         struct berval fbv;
1086         int rc = 0;
1087
1088         Debug(LDAP_DEBUG_TRACE, "==> translucent_search: <%s> %s\n",
1089                 op->o_req_dn.bv_val, op->ors_filterstr.bv_val, 0);
1090
1091         if(ov->defer_db_open) {
1092                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
1093                         "remote DB not available");
1094                 return(rs->sr_err);
1095         }
1096
1097         fr = ov->remote ? trans_filter_dup( op, op->ors_filter, ov->remote ) : NULL;
1098         fl = ov->local ? trans_filter_dup( op, op->ors_filter, ov->local ) : NULL;
1099         cb.sc_response = (slap_response *) translucent_search_cb;
1100         cb.sc_private = &tc;
1101         cb.sc_next = op->o_callback;
1102
1103         ov->db.be_acl = op->o_bd->be_acl;
1104         tc.db = op->o_bd;
1105         tc.on = on;
1106         tc.orig = op->ors_filter;
1107         tc.list = NULL;
1108         tc.step = 0;
1109         fbv = op->ors_filterstr;
1110
1111         op->o_callback = &cb;
1112
1113         tc.slimit = op->ors_slimit;
1114
1115         if ( fr || !fl ) {
1116                 AttributeName *attrs = op->ors_attrs;
1117                 op->ors_slimit = SLAP_NO_LIMIT;
1118                 op->ors_attrs = NULL;
1119                 op->o_bd = &ov->db;
1120                 tc.step |= RMT_SIDE;
1121                 if ( fl ) {
1122                         tc.step |= USE_LIST;
1123                         op->ors_filter = fr;
1124                         filter2bv_x( op, fr, &op->ors_filterstr );
1125                 }
1126                 rc = ov->db.bd_info->bi_op_search(op, rs);
1127                 op->ors_attrs = attrs;
1128                 op->o_bd = tc.db;
1129                 if ( fl ) {
1130                         op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
1131                 }
1132         }
1133         if ( fl && !rc ) {
1134                 tc.step |= LCL_SIDE;
1135                 op->ors_filter = fl;
1136                 filter2bv_x( op, fl, &op->ors_filterstr );
1137                 rc = overlay_op_walk( op, rs, op_search, on->on_info, on->on_next );
1138                 op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
1139         }
1140         op->ors_filterstr = fbv;
1141         op->ors_filter = tc.orig;
1142         op->o_callback = cb.sc_next;
1143         rs->sr_attrs = op->ors_attrs;
1144
1145         /* Send out anything remaining on the list and finish */
1146         if ( tc.step & USE_LIST ) {
1147                 if ( tc.list ) {
1148                         Avlnode *av;
1149
1150                         av = tavl_end( tc.list, TAVL_DIR_LEFT );
1151                         while ( av ) {
1152                                 rs->sr_entry = av->avl_data;
1153                                 rc = test_filter( op, rs->sr_entry, op->ors_filter );
1154                                 if ( rc == LDAP_COMPARE_TRUE ) {
1155                                         rs->sr_flags = REP_ENTRY_MUSTBEFREED;
1156                                         rc = send_search_entry( op, rs );
1157                                         if ( rc ) break;
1158                                 } else {
1159                                         entry_free( rs->sr_entry );
1160                                 }
1161                                 av = tavl_next( av, TAVL_DIR_RIGHT );
1162                         }
1163                         tavl_free( tc.list, NULL );
1164                         rs->sr_entry = NULL;
1165                 }
1166                 send_ldap_result( op, rs );
1167         }
1168
1169         op->ors_slimit = tc.slimit;
1170
1171         /* Free in reverse order */
1172         if ( fl )
1173                 trans_filter_free( op, fl );
1174         if ( fr )
1175                 trans_filter_free( op, fr );
1176
1177         return rc;
1178 }
1179
1180
1181 /*
1182 ** translucent_bind()
1183 **      pass bind request to captive backend;
1184 **
1185 */
1186
1187 static int translucent_bind(Operation *op, SlapReply *rs) {
1188         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
1189         translucent_info *ov = on->on_bi.bi_private;
1190         BackendDB *db;
1191         slap_callback sc = { 0 }, *save_cb;
1192         int rc;
1193
1194         Debug(LDAP_DEBUG_TRACE, "translucent_bind: <%s> method %d\n",
1195                 op->o_req_dn.bv_val, op->orb_method, 0);
1196
1197         if(ov->defer_db_open) {
1198                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
1199                         "remote DB not available");
1200                 return(rs->sr_err);
1201         }
1202
1203         if (ov->bind_local) {
1204                 sc.sc_response = slap_null_cb;
1205                 save_cb = op->o_callback;
1206                 op->o_callback = &sc;
1207         }
1208
1209         db = op->o_bd;
1210         op->o_bd = &ov->db;
1211         ov->db.be_acl = op->o_bd->be_acl;
1212         rc = ov->db.bd_info->bi_op_bind(op, rs);
1213         op->o_bd = db;
1214
1215         if (ov->bind_local) {
1216                 op->o_callback = save_cb;
1217                 if (rc != LDAP_SUCCESS) {
1218                         rc = SLAP_CB_CONTINUE;
1219                 }
1220         }
1221
1222         return rc;
1223 }
1224
1225 /*
1226 ** translucent_connection_destroy()
1227 **      pass disconnect notification to captive backend;
1228 **
1229 */
1230
1231 static int translucent_connection_destroy(BackendDB *be, Connection *conn) {
1232         slap_overinst *on = (slap_overinst *) be->bd_info;
1233         translucent_info *ov = on->on_bi.bi_private;
1234         int rc = 0;
1235
1236         Debug(LDAP_DEBUG_TRACE, "translucent_connection_destroy\n", 0, 0, 0);
1237
1238         rc = ov->db.bd_info->bi_connection_destroy(&ov->db, conn);
1239
1240         return(rc);
1241 }
1242
1243 /*
1244 ** translucent_db_config()
1245 **      pass config directives to captive backend;
1246 **      parse unrecognized directives ourselves;
1247 **
1248 */
1249
1250 static int translucent_db_config(
1251         BackendDB       *be,
1252         const char      *fname,
1253         int             lineno,
1254         int             argc,
1255         char            **argv
1256 )
1257 {
1258         slap_overinst *on = (slap_overinst *) be->bd_info;
1259         translucent_info *ov = on->on_bi.bi_private;
1260
1261         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_config: %s\n",
1262               argc ? argv[0] : "", 0, 0);
1263
1264         /* Something for the captive database? */
1265         if ( ov->db.bd_info && ov->db.bd_info->bi_db_config )
1266                 return ov->db.bd_info->bi_db_config( &ov->db, fname, lineno,
1267                         argc, argv );
1268         return SLAP_CONF_UNKNOWN;
1269 }
1270
1271 /*
1272 ** translucent_db_init()
1273 **      initialize the captive backend;
1274 **
1275 */
1276
1277 static int translucent_db_init(BackendDB *be, ConfigReply *cr) {
1278         slap_overinst *on = (slap_overinst *) be->bd_info;
1279         translucent_info *ov;
1280
1281         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_init\n", 0, 0, 0);
1282
1283         ov = ch_calloc(1, sizeof(translucent_info));
1284         on->on_bi.bi_private = ov;
1285         ov->db = *be;
1286         ov->db.be_private = NULL;
1287         ov->defer_db_open = 1;
1288
1289         if ( !backend_db_init( "ldap", &ov->db, -1, NULL )) {
1290                 Debug( LDAP_DEBUG_CONFIG, "translucent: unable to open captive back-ldap\n", 0, 0, 0);
1291                 return 1;
1292         }
1293         SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NO_SCHEMA_CHECK;
1294         SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NOLASTMOD;
1295
1296         return 0;
1297 }
1298
1299 /*
1300 ** translucent_db_open()
1301 **      if the captive backend has an open() method, call it;
1302 **
1303 */
1304
1305 static int translucent_db_open(BackendDB *be, ConfigReply *cr) {
1306         slap_overinst *on = (slap_overinst *) be->bd_info;
1307         translucent_info *ov = on->on_bi.bi_private;
1308         int rc;
1309
1310         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_open\n", 0, 0, 0);
1311
1312         /* need to inherit something from the original database... */
1313         ov->db.be_def_limit = be->be_def_limit;
1314         ov->db.be_limits = be->be_limits;
1315         ov->db.be_acl = be->be_acl;
1316         ov->db.be_dfltaccess = be->be_dfltaccess;
1317
1318         if ( ov->defer_db_open )
1319                 return 0;
1320
1321         rc = backend_startup_one( &ov->db, cr );
1322
1323         if(rc) Debug(LDAP_DEBUG_TRACE,
1324                 "translucent: bi_db_open() returned error %d\n", rc, 0, 0);
1325
1326         return(rc);
1327 }
1328
1329 /*
1330 ** translucent_db_close()
1331 **      if the captive backend has a close() method, call it
1332 **
1333 */
1334
1335 static int
1336 translucent_db_close( BackendDB *be, ConfigReply *cr )
1337 {
1338         slap_overinst *on = (slap_overinst *) be->bd_info;
1339         translucent_info *ov = on->on_bi.bi_private;
1340         int rc = 0;
1341
1342         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_close\n", 0, 0, 0);
1343
1344         if ( ov && ov->db.bd_info && ov->db.bd_info->bi_db_close ) {
1345                 rc = ov->db.bd_info->bi_db_close(&ov->db, NULL);
1346         }
1347
1348         return(rc);
1349 }
1350
1351 /*
1352 ** translucent_db_destroy()
1353 **      if the captive backend has a db_destroy() method, call it;
1354 **      free any config data
1355 **
1356 */
1357
1358 static int
1359 translucent_db_destroy( BackendDB *be, ConfigReply *cr )
1360 {
1361         slap_overinst *on = (slap_overinst *) be->bd_info;
1362         translucent_info *ov = on->on_bi.bi_private;
1363         int rc = 0;
1364
1365         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_destroy\n", 0, 0, 0);
1366
1367         if ( ov ) {
1368                 if ( ov->remote )
1369                         anlist_free( ov->remote, 1, NULL );
1370                 if ( ov->local )
1371                         anlist_free( ov->local, 1, NULL );
1372                 if ( ov->db.be_private != NULL ) {
1373                         backend_stopdown_one( &ov->db );
1374                 }
1375
1376                 ch_free(ov);
1377                 on->on_bi.bi_private = NULL;
1378         }
1379
1380         return(rc);
1381 }
1382
1383 /*
1384 ** translucent_initialize()
1385 **      initialize the slap_overinst with our entry points;
1386 **
1387 */
1388
1389 int translucent_initialize() {
1390
1391         int rc;
1392
1393         Debug(LDAP_DEBUG_TRACE, "==> translucent_initialize\n", 0, 0, 0);
1394
1395         translucent.on_bi.bi_type       = "translucent";
1396         translucent.on_bi.bi_db_init    = translucent_db_init;
1397         translucent.on_bi.bi_db_config  = translucent_db_config;
1398         translucent.on_bi.bi_db_open    = translucent_db_open;
1399         translucent.on_bi.bi_db_close   = translucent_db_close;
1400         translucent.on_bi.bi_db_destroy = translucent_db_destroy;
1401         translucent.on_bi.bi_op_bind    = translucent_bind;
1402         translucent.on_bi.bi_op_add     = translucent_add;
1403         translucent.on_bi.bi_op_modify  = translucent_modify;
1404         translucent.on_bi.bi_op_modrdn  = translucent_modrdn;
1405         translucent.on_bi.bi_op_delete  = translucent_delete;
1406         translucent.on_bi.bi_op_search  = translucent_search;
1407         translucent.on_bi.bi_op_compare = translucent_compare;
1408         translucent.on_bi.bi_connection_destroy = translucent_connection_destroy;
1409         translucent.on_bi.bi_extended   = translucent_exop;
1410
1411         translucent.on_bi.bi_cf_ocs = translucentocs;
1412         rc = config_register_schema ( translucentcfg, translucentocs );
1413         if ( rc ) return rc;
1414
1415         return(overlay_register(&translucent));
1416 }
1417
1418 #if SLAPD_OVER_TRANSLUCENT == SLAPD_MOD_DYNAMIC && defined(PIC)
1419 int init_module(int argc, char *argv[]) {
1420         return translucent_initialize();
1421 }
1422 #endif
1423
1424 #endif /* SLAPD_OVER_TRANSLUCENT */