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 2004-2007 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         int strict;
  40         int no_glue;
  41         int defer_db_open;
  42 } translucent_info;
  43
  44 static ConfigLDAPadd translucent_ldadd;
  45 static ConfigCfAdd translucent_cfadd;
  46
  47 static ConfigTable translucentcfg[] = {
  48         { "translucent_strict", "on|off", 1, 2, 0,
  49           ARG_ON_OFF|ARG_OFFSET,
  50           (void *)offsetof(translucent_info, strict),
  51           "( OLcfgOvAt:14.1 NAME 'olcTranslucentStrict' "
  52           "DESC 'Reveal attribute deletion constraint violations' "
  53           "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
  54         { "translucent_no_glue", "on|off", 1, 2, 0,
  55           ARG_ON_OFF|ARG_OFFSET,
  56           (void *)offsetof(translucent_info, no_glue),
  57           "( OLcfgOvAt:14.2 NAME 'olcTranslucentNoGlue' "
  58           "DESC 'Disable automatic glue records for ADD and MODRDN' "
  59           "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
  60         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
  61 };
  62
  63 static ConfigTable transdummy[] = {
  64         { "", "", 0, 0, 0, ARG_IGNORED,
  65                 NULL, "( OLcfgGlAt:13 NAME 'olcDatabase' "
  66                         "DESC 'The backend type for a database instance' "
  67                         "SUP olcBackend SINGLE-VALUE X-ORDERED 'SIBLINGS' )", NULL, NULL },
  68         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
  69 };
  70
  71 static ConfigOCs translucentocs[] = {
  72         { "( OLcfgOvOc:14.1 "
  73           "NAME 'olcTranslucentConfig' "
  74           "DESC 'Translucent configuration' "
  75           "SUP olcOverlayConfig "
  76           "MAY ( olcTranslucentStrict $ olcTranslucentNoGlue ) )",
  77           Cft_Overlay, translucentcfg, NULL, translucent_cfadd },
  78         { "( OLcfgOvOc:14.2 "
  79           "NAME 'olcTranslucentDatabase' "
  80           "DESC 'Translucent target database configuration' "
  81           "AUXILIARY )", Cft_Misc, transdummy, translucent_ldadd },
  82         { NULL, 0, NULL }
  83 };
  84 /* for translucent_init() */
  85
  86 static int
  87 translucent_ldadd_cleanup( ConfigArgs *ca )
  88 {
  89         slap_overinst *on = ca->private;
  90         translucent_info *ov = on->on_bi.bi_private;
  91
  92         ov->defer_db_open = 0;
  93         return backend_startup_one( ca->be, &ca->reply );
  94 }
  95
  96 static int
  97 translucent_ldadd( CfEntryInfo *cei, Entry *e, ConfigArgs *ca )
  98 {
  99         slap_overinst *on;
 100         translucent_info *ov;
 101
 102         Debug(LDAP_DEBUG_TRACE, "==> translucent_ldadd\n", 0, 0, 0);
 103
 104         if ( cei->ce_type != Cft_Overlay || !cei->ce_bi ||
 105              cei->ce_bi->bi_cf_ocs != translucentocs )
 106                 return LDAP_CONSTRAINT_VIOLATION;
 107
 108         on = (slap_overinst *)cei->ce_bi;
 109         ov = on->on_bi.bi_private;
 110         ca->be = &ov->db;
 111         ca->private = on;
 112         if ( CONFIG_ONLINE_ADD( ca ))
 113                 ca->cleanup = translucent_ldadd_cleanup;
 114         else
 115                 ov->defer_db_open = 0;
 116
 117         return LDAP_SUCCESS;
 118 }
 119
 120 static int
 121 translucent_cfadd( Operation *op, SlapReply *rs, Entry *e, ConfigArgs *ca )
 122 {
 123         CfEntryInfo *cei = e->e_private;
 124         slap_overinst *on = (slap_overinst *)cei->ce_bi;
 125         translucent_info *ov = on->on_bi.bi_private;
 126         struct berval bv;
 127
 128         Debug(LDAP_DEBUG_TRACE, "==> translucent_cfadd\n", 0, 0, 0);
 129
 130         /* FIXME: should not hardcode "olcDatabase" here */
 131         bv.bv_len = snprintf( ca->cr_msg, sizeof( ca->cr_msg ),
 132                 "olcDatabase=%s", ov->db.bd_info->bi_type );
 133         if ( bv.bv_len < 0 || bv.bv_len >= sizeof( ca->cr_msg ) ) {
 134                 return -1;
 135         }
 136         bv.bv_val = ca->cr_msg;
 137         ca->be = &ov->db;
 138         ov->defer_db_open = 0;
 139
 140         /* We can only create this entry if the database is table-driven
 141          */
 142         if ( ov->db.bd_info->bi_cf_ocs )
 143                 config_build_entry( op, rs, cei, ca, &bv,
 144                                     ov->db.bd_info->bi_cf_ocs,
 145                                     &translucentocs[1] );
 146
 147         return 0;
 148 }
 149
 150 static slap_overinst translucent;
 151
 152 /*
 153 ** glue_parent()
 154 **      call syncrepl_add_glue() with the parent suffix;
 155 **
 156 */
 157
 158 static struct berval glue[] = { BER_BVC("top"), BER_BVC("glue"), BER_BVNULL };
 159
 160 void glue_parent(Operation *op) {
 161         Operation nop = *op;
 162         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 163         struct berval ndn = BER_BVNULL;
 164         Attribute *a;
 165         Entry *e;
 166         struct berval   pdn;
 167
 168         dnParent( &op->o_req_ndn, &pdn );
 169         ber_dupbv_x( &ndn, &pdn, op->o_tmpmemctx );
 170
 171         Debug(LDAP_DEBUG_TRACE, "=> glue_parent: fabricating glue for <%s>\n", ndn.bv_val, 0, 0);
 172
 173         e = entry_alloc();
 174         e->e_id = NOID;
 175         ber_dupbv(&e->e_name, &ndn);
 176         ber_dupbv(&e->e_nname, &ndn);
 177
 178         a = attr_alloc( slap_schema.si_ad_objectClass );
 179         a->a_numvals = 2;
 180         a->a_vals = ch_malloc(sizeof(struct berval) * 3);
 181         ber_dupbv(&a->a_vals[0], &glue[0]);
 182         ber_dupbv(&a->a_vals[1], &glue[1]);
 183         ber_dupbv(&a->a_vals[2], &glue[2]);
 184         a->a_nvals = a->a_vals;
 185         a->a_next = e->e_attrs;
 186         e->e_attrs = a;
 187
 188         a = attr_alloc( slap_schema.si_ad_structuralObjectClass );
 189         a->a_numvals = 1;
 190         a->a_vals = ch_malloc(sizeof(struct berval) * 2);
 191         ber_dupbv(&a->a_vals[0], &glue[1]);
 192         ber_dupbv(&a->a_vals[1], &glue[2]);
 193         a->a_nvals = a->a_vals;
 194         a->a_next = e->e_attrs;
 195         e->e_attrs = a;
 196
 197         nop.o_req_dn = ndn;
 198         nop.o_req_ndn = ndn;
 199         nop.ora_e = e;
 200
 201         nop.o_bd->bd_info = (BackendInfo *) on->on_info->oi_orig;
 202         syncrepl_add_glue(&nop, e);
 203         nop.o_bd->bd_info = (BackendInfo *) on;
 204
 205         op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
 206
 207         return;
 208 }
 209
 210 /*
 211 ** dup_bervarray()
 212 **      copy a BerVarray;
 213 */
 214
 215 BerVarray dup_bervarray(BerVarray b) {
 216         int i, len;
 217         BerVarray nb;
 218         for(len = 0; b[len].bv_val; len++);
 219         nb = ch_malloc((len+1) * sizeof(BerValue));
 220         for(i = 0; i < len; i++) ber_dupbv(&nb[i], &b[i]);
 221         nb[len].bv_val = NULL;
 222         nb[len].bv_len = 0;
 223         return(nb);
 224 }
 225
 226 /*
 227 ** free_attr_chain()
 228 **      free only the Attribute*, not the contents;
 229 **
 230 */
 231 void free_attr_chain(Attribute *b) {
 232         Attribute *a;
 233         for(a=b; a; a=a->a_next) {
 234                 a->a_vals = NULL;
 235                 a->a_nvals = NULL;
 236         }
 237         attrs_free( b );
 238         return;
 239 }
 240
 241 /*
 242 ** translucent_add()
 243 **      if not bound as root, send ACCESS error;
 244 **      if glue, glue_parent();
 245 **      return CONTINUE;
 246 **
 247 */
 248
 249 static int translucent_add(Operation *op, SlapReply *rs) {
 250         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 251         translucent_info *ov = on->on_bi.bi_private;
 252         Debug(LDAP_DEBUG_TRACE, "==> translucent_add: %s\n",
 253                 op->o_req_dn.bv_val, 0, 0);
 254         if(!be_isroot(op)) {
 255                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 256                 send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
 257                         "user modification of overlay database not permitted");
 258                 op->o_bd->bd_info = (BackendInfo *) on;
 259                 return(rs->sr_err);
 260         }
 261         if(!ov->no_glue) glue_parent(op);
 262         return(SLAP_CB_CONTINUE);
 263 }
 264
 265 /*
 266 ** translucent_modrdn()
 267 **      if not bound as root, send ACCESS error;
 268 **      if !glue, glue_parent();
 269 **      else return CONTINUE;
 270 **
 271 */
 272
 273 static int translucent_modrdn(Operation *op, SlapReply *rs) {
 274         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 275         translucent_info *ov = on->on_bi.bi_private;
 276         Debug(LDAP_DEBUG_TRACE, "==> translucent_modrdn: %s -> %s\n",
 277                 op->o_req_dn.bv_val, op->orr_newrdn.bv_val, 0);
 278         if(!be_isroot(op)) {
 279                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 280                 send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
 281                         "user modification of overlay database not permitted");
 282                 op->o_bd->bd_info = (BackendInfo *) on;
 283                 return(rs->sr_err);
 284         }
 285         if(!ov->no_glue) {
 286                 op->o_tag = LDAP_REQ_ADD;
 287                 glue_parent(op);
 288                 op->o_tag = LDAP_REQ_MODRDN;
 289         }
 290         return(SLAP_CB_CONTINUE);
 291 }
 292
 293 /*
 294 ** translucent_delete()
 295 **      if not bound as root, send ACCESS error;
 296 **      else return CONTINUE;
 297 **
 298 */
 299
 300 static int translucent_delete(Operation *op, SlapReply *rs) {
 301         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 302         Debug(LDAP_DEBUG_TRACE, "==> translucent_delete: %s\n",
 303                 op->o_req_dn.bv_val, 0, 0);
 304         if(!be_isroot(op)) {
 305                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 306                 send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
 307                         "user modification of overlay database not permitted");
 308                 op->o_bd->bd_info = (BackendInfo *) on;
 309                 return(rs->sr_err);
 310         }
 311         return(SLAP_CB_CONTINUE);
 312 }
 313
 314 static int
 315 translucent_tag_cb( Operation *op, SlapReply *rs )
 316 {
 317         op->o_tag = LDAP_REQ_MODIFY;
 318         op->orm_modlist = op->o_callback->sc_private;
 319         rs->sr_tag = slap_req2res( op->o_tag );
 320
 321         return SLAP_CB_CONTINUE;
 322 }
 323
 324 /*
 325 ** translucent_modify()
 326 **      modify in local backend if exists in both;
 327 **      otherwise, add to local backend;
 328 **      fail if not defined in captive backend;
 329 **
 330 */
 331
 332 static int translucent_modify(Operation *op, SlapReply *rs) {
 333         SlapReply nrs = { REP_RESULT };
 334
 335         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 336         translucent_info *ov = on->on_bi.bi_private;
 337         Entry *e = NULL, *re = NULL;
 338         Attribute *a, *ax;
 339         Modifications *m, **mm;
 340         BackendDB *db;
 341         int del, rc, erc = 0;
 342         slap_callback cb = { 0 };
 343
 344         Debug(LDAP_DEBUG_TRACE, "==> translucent_modify: %s\n",
 345                 op->o_req_dn.bv_val, 0, 0);
 346
 347         if(ov->defer_db_open) {
 348                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 349                         "remote DB not available");
 350                 return(rs->sr_err);
 351         }
 352 /*
 353 ** fetch entry from the captive backend;
 354 ** if it did not exist, fail;
 355 ** release it, if captive backend supports this;
 356 **
 357 */
 358
 359         db = op->o_bd;
 360         op->o_bd = &ov->db;
 361         rc = ov->db.bd_info->bi_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &re);
 362         if(rc != LDAP_SUCCESS || re == NULL ) {
 363                 send_ldap_error((op), rs, LDAP_NO_SUCH_OBJECT,
 364                         "attempt to modify nonexistent local record");
 365                 return(rs->sr_err);
 366         }
 367         op->o_bd = db;
 368 /*
 369 ** fetch entry from local backend;
 370 ** if it exists:
 371 **      foreach Modification:
 372 **          if attr not present in local:
 373 **              if Mod == LDAP_MOD_DELETE:
 374 **                  if remote attr not present, return NO_SUCH;
 375 **                  if remote attr present, drop this Mod;
 376 **              else force this Mod to LDAP_MOD_ADD;
 377 **      return CONTINUE;
 378 **
 379 */
 380
 381         op->o_bd->bd_info = (BackendInfo *) on->on_info;
 382         rc = be_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &e);
 383         op->o_bd->bd_info = (BackendInfo *) on;
 384
 385         if(e && rc == LDAP_SUCCESS) {
 386                 Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: found local entry\n", 0, 0, 0);
 387                 for(mm = &op->orm_modlist; *mm; ) {
 388                         m = *mm;
 389                         for(a = e->e_attrs; a; a = a->a_next)
 390                                 if(a->a_desc == m->sml_desc) break;
 391                         if(a) {
 392                                 mm = &m->sml_next;
 393                                 continue;               /* found local attr */
 394                         }
 395                         if(m->sml_op == LDAP_MOD_DELETE) {
 396                                 for(a = re->e_attrs; a; a = a->a_next)
 397                                         if(a->a_desc == m->sml_desc) break;
 398                                 /* not found remote attr */
 399                                 if(!a) {
 400                                         erc = LDAP_NO_SUCH_ATTRIBUTE;
 401                                         goto release;
 402                                 }
 403                                 if(ov->strict) {
 404                                         erc = LDAP_CONSTRAINT_VIOLATION;
 405                                         goto release;
 406                                 }
 407                                 Debug(LDAP_DEBUG_TRACE,
 408                                         "=> translucent_modify: silently dropping delete: %s\n",
 409                                         m->sml_desc->ad_cname.bv_val, 0, 0);
 410                                 *mm = m->sml_next;
 411                                 m->sml_next = NULL;
 412                                 slap_mods_free(m, 1);
 413                                 continue;
 414                         }
 415                         m->sml_op = LDAP_MOD_ADD;
 416                         mm = &m->sml_next;
 417                 }
 418                 erc = SLAP_CB_CONTINUE;
 419 release:
 420                 if(re) {
 421                         if(ov->db.bd_info->bi_entry_release_rw) {
 422                                 op->o_bd = &ov->db;
 423                                 ov->db.bd_info->bi_entry_release_rw(op, re, 0);
 424                                 op->o_bd = db;
 425                         } else
 426                                 entry_free(re);
 427                 }
 428                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 429                 be_entry_release_r(op, e);
 430                 op->o_bd->bd_info = (BackendInfo *) on;
 431                 if(erc == SLAP_CB_CONTINUE) {
 432                         return(erc);
 433                 } else if(erc) {
 434                         send_ldap_error(op, rs, erc,
 435                                 "attempt to delete nonexistent attribute");
 436                         return(erc);
 437                 }
 438         }
 439
 440         /* don't leak remote entry copy */
 441         if(re) {
 442                 if(ov->db.bd_info->bi_entry_release_rw) {
 443                         op->o_bd = &ov->db;
 444                         ov->db.bd_info->bi_entry_release_rw(op, re, 0);
 445                         op->o_bd = db;
 446                 } else
 447                         entry_free(re);
 448         }
 449 /*
 450 ** foreach Modification:
 451 **      if MOD_ADD or MOD_REPLACE, add Attribute;
 452 ** if no Modifications were suitable:
 453 **      if strict, throw CONSTRAINT_VIOLATION;
 454 **      else, return early SUCCESS;
 455 ** fabricate Entry with new Attribute chain;
 456 ** glue_parent() for this Entry;
 457 ** call bi_op_add() in local backend;
 458 **
 459 */
 460
 461         Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: fabricating local add\n", 0, 0, 0);
 462         a = NULL;
 463         for(del = 0, ax = NULL, m = op->orm_modlist; m; m = m->sml_next) {
 464                 Attribute atmp;
 465                 if(((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_ADD) &&
 466                    ((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_REPLACE)) {
 467                         Debug(LDAP_DEBUG_ANY,
 468                                 "=> translucent_modify: silently dropped modification(%d): %s\n",
 469                                 m->sml_op, m->sml_desc->ad_cname.bv_val, 0);
 470                         if((m->sml_op & LDAP_MOD_OP) == LDAP_MOD_DELETE) del++;
 471                         continue;
 472                 }
 473                 atmp.a_desc = m->sml_desc;
 474                 atmp.a_vals = m->sml_values;
 475                 atmp.a_nvals = m->sml_nvalues ? m->sml_nvalues : atmp.a_vals;
 476                 atmp.a_numvals = m->sml_numvals;
 477                 atmp.a_flags = 0;
 478                 a = attr_dup( &atmp );
 479                 a->a_next  = ax;
 480                 ax = a;
 481         }
 482
 483         if(del && ov->strict) {
 484                 attrs_free( a );
 485                 send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
 486                         "attempt to delete attributes from local database");
 487                 return(rs->sr_err);
 488         }
 489
 490         if(!ax) {
 491                 if(ov->strict) {
 492                         send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
 493                                 "modification contained other than ADD or REPLACE");
 494                         return(rs->sr_err);
 495                 }
 496                 /* rs->sr_text = "no valid modification found"; */
 497                 rs->sr_err = LDAP_SUCCESS;
 498                 send_ldap_result(op, rs);
 499                 return(rs->sr_err);
 500         }
 501
 502         e = entry_alloc();
 503         ber_dupbv( &e->e_name, &op->o_req_dn );
 504         ber_dupbv( &e->e_nname, &op->o_req_ndn );
 505         e->e_attrs = a;
 506
 507         op->o_tag       = LDAP_REQ_ADD;
 508         cb.sc_response = translucent_tag_cb;
 509         cb.sc_private = op->orm_modlist;
 510         op->oq_add.rs_e = e;
 511
 512         glue_parent(op);
 513
 514         cb.sc_next = op->o_callback;
 515         op->o_callback = &cb;
 516         rc = on->on_info->oi_orig->bi_op_add(op, &nrs);
 517         if ( op->ora_e == e )
 518                 entry_free( e );
 519         op->o_callback = cb.sc_next;
 520
 521         return(rc);
 522 }
 523
 524 static int translucent_compare(Operation *op, SlapReply *rs) {
 525         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 526         translucent_info *ov = on->on_bi.bi_private;
 527         AttributeAssertion *ava = op->orc_ava;
 528         Entry *e;
 529         BackendDB *db;
 530         int rc;
 531
 532         Debug(LDAP_DEBUG_TRACE, "==> translucent_compare: <%s> %s:%s\n",
 533                 op->o_req_dn.bv_val, ava->aa_desc->ad_cname.bv_val, ava->aa_value.bv_val);
 534
 535 /*
 536 ** if the local backend has an entry for this attribute:
 537 **      CONTINUE and let it do the compare;
 538 **
 539 */
 540         rc = overlay_entry_get_ov(op, &op->o_req_ndn, NULL, ava->aa_desc, 0, &e, on);
 541         if(e && rc == LDAP_SUCCESS) {
 542                 overlay_entry_release_ov(op, e, 0, on);
 543                 return(SLAP_CB_CONTINUE);
 544         }
 545
 546         if(ov->defer_db_open) {
 547                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 548                         "remote DB not available");
 549                 return(rs->sr_err);
 550         }
 551 /*
 552 ** call compare() in the captive backend;
 553 ** return the result;
 554 **
 555 */
 556         db = op->o_bd;
 557         op->o_bd = &ov->db;
 558         rc = ov->db.bd_info->bi_op_compare(op, rs);
 559         op->o_bd = db;
 560
 561         return(rc);
 562 }
 563
 564 /*
 565 ** translucent_search_cb()
 566 **      merge local data with the search result
 567 **
 568 */
 569
 570 static int translucent_search_cb(Operation *op, SlapReply *rs) {
 571         BackendDB *db;
 572         slap_overinst *on;
 573         Entry *e, *re = NULL;
 574         Attribute *a, *ax, *an, *as = NULL;
 575         int rc;
 576
 577         if(!op || !rs || rs->sr_type != REP_SEARCH || !rs->sr_entry)
 578                 return(SLAP_CB_CONTINUE);
 579
 580         Debug(LDAP_DEBUG_TRACE, "==> translucent_search_cb: %s\n",
 581                 rs->sr_entry->e_name.bv_val, 0, 0);
 582
 583         db = op->o_bd;
 584         op->o_bd = op->o_callback->sc_private;
 585         on = (slap_overinst *) op->o_bd->bd_info;
 586
 587         rc = overlay_entry_get_ov(op, &rs->sr_entry->e_nname, NULL, NULL, 0, &e, on);
 588
 589 /*
 590 ** if we got an entry from local backend:
 591 **      make a copy of this search result;
 592 **      foreach local attr:
 593 **              foreach search result attr:
 594 **                      if match, result attr with local attr;
 595 **                      if new local, add to list;
 596 **      append new local attrs to search result;
 597 **
 598 */
 599
 600         if(e && rc == LDAP_SUCCESS) {
 601                 re = entry_dup(rs->sr_entry);
 602                 for(ax = e->e_attrs; ax; ax = ax->a_next) {
 603 #if 0
 604                         if(is_at_operational(ax->a_desc->ad_type)) continue;
 605 #endif
 606                         for(a = re->e_attrs; a; a = a->a_next) {
 607                                 if(a->a_desc == ax->a_desc) {
 608                                         if(a->a_vals != a->a_nvals)
 609                                                 ber_bvarray_free(a->a_nvals);
 610                                         ber_bvarray_free(a->a_vals);
 611                                         a->a_vals = dup_bervarray(ax->a_vals);
 612                                         a->a_nvals = (ax->a_vals == ax->a_nvals) ?
 613                                                 a->a_vals : dup_bervarray(ax->a_nvals);
 614                                         break;
 615                                 }
 616                         }
 617                         if(a) continue;
 618                         an = attr_dup(ax);
 619                         an->a_next = as;
 620                         as = an;
 621                 }
 622                 overlay_entry_release_ov(op, e, 0, on);
 623
 624                 /* literally append, so locals are always last */
 625                 if(as) {
 626                         if(re->e_attrs) {
 627                                 for(ax = re->e_attrs; ax->a_next; ax = ax->a_next);
 628                                 ax->a_next = as;
 629                         } else {
 630                                 re->e_attrs = as;
 631                         }
 632                 }
 633                 rs->sr_entry = re;
 634                 rs->sr_flags |= REP_ENTRY_MUSTBEFREED;
 635         }
 636
 637         op->o_bd = db;
 638         return(SLAP_CB_CONTINUE);
 639 }
 640
 641 /*
 642 ** translucent_search()
 643 **      search via captive backend;
 644 **      override results with any local data;
 645 **
 646 */
 647
 648 static int translucent_search(Operation *op, SlapReply *rs) {
 649         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 650         translucent_info *ov = on->on_bi.bi_private;
 651         slap_callback cb = { NULL, NULL, NULL, NULL };
 652         int rc;
 653
 654         Debug(LDAP_DEBUG_TRACE, "==> translucent_search: <%s> %s\n",
 655                 op->o_req_dn.bv_val, op->ors_filterstr.bv_val, 0);
 656
 657         if(ov->defer_db_open) {
 658                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 659                         "remote DB not available");
 660                 return(rs->sr_err);
 661         }
 662         cb.sc_response = (slap_response *) translucent_search_cb;
 663         cb.sc_private = op->o_bd;
 664         cb.sc_next = op->o_callback;
 665
 666         op->o_callback = &cb;
 667         op->o_bd = &ov->db;
 668         rc = ov->db.bd_info->bi_op_search(op, rs);
 669         op->o_bd = cb.sc_private;
 670
 671         return rc;
 672 }
 673
 674
 675 /*
 676 ** translucent_bind()
 677 **      pass bind request to captive backend;
 678 **
 679 */
 680
 681 static int translucent_bind(Operation *op, SlapReply *rs) {
 682         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 683         translucent_info *ov = on->on_bi.bi_private;
 684         BackendDB *db;
 685         int rc;
 686
 687         Debug(LDAP_DEBUG_TRACE, "translucent_bind: <%s> method %d\n",
 688                 op->o_req_dn.bv_val, op->orb_method, 0);
 689
 690         if(ov->defer_db_open) {
 691                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 692                         "remote DB not available");
 693                 return(rs->sr_err);
 694         }
 695         db = op->o_bd;
 696         op->o_bd = &ov->db;
 697         rc = ov->db.bd_info->bi_op_bind(op, rs);
 698         op->o_bd = db;
 699         return rc;
 700 }
 701
 702 /*
 703 ** translucent_connection_destroy()
 704 **      pass disconnect notification to captive backend;
 705 **
 706 */
 707
 708 static int translucent_connection_destroy(BackendDB *be, Connection *conn) {
 709         slap_overinst *on = (slap_overinst *) be->bd_info;
 710         translucent_info *ov = on->on_bi.bi_private;
 711         int rc = 0;
 712
 713         Debug(LDAP_DEBUG_TRACE, "translucent_connection_destroy\n", 0, 0, 0);
 714
 715         rc = ov->db.bd_info->bi_connection_destroy(&ov->db, conn);
 716
 717         return(rc);
 718 }
 719
 720 /*
 721 ** translucent_db_config()
 722 **      pass config directives to captive backend;
 723 **      parse unrecognized directives ourselves;
 724 **
 725 */
 726
 727 static int translucent_db_config(
 728         BackendDB       *be,
 729         const char      *fname,
 730         int             lineno,
 731         int             argc,
 732         char            **argv
 733 )
 734 {
 735         slap_overinst *on = (slap_overinst *) be->bd_info;
 736         translucent_info *ov = on->on_bi.bi_private;
 737
 738         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_config: %s\n",
 739               argc ? argv[0] : "", 0, 0);
 740
 741         /* Something for the captive database? */
 742         if ( ov->db.bd_info && ov->db.bd_info->bi_db_config )
 743                 return ov->db.bd_info->bi_db_config( &ov->db, fname, lineno,
 744                         argc, argv );
 745         return SLAP_CONF_UNKNOWN;
 746 }
 747
 748 /*
 749 ** translucent_db_init()
 750 **      initialize the captive backend;
 751 **
 752 */
 753
 754 static int translucent_db_init(BackendDB *be, ConfigReply *cr) {
 755         slap_overinst *on = (slap_overinst *) be->bd_info;
 756         translucent_info *ov;
 757
 758         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_init\n", 0, 0, 0);
 759
 760         ov = ch_calloc(1, sizeof(translucent_info));
 761         on->on_bi.bi_private = ov;
 762         ov->db = *be;
 763         ov->db.be_private = NULL;
 764         ov->db.be_pcl_mutexp = &ov->db.be_pcl_mutex;
 765         ov->defer_db_open = 1;
 766
 767         if ( !backend_db_init( "ldap", &ov->db, -1, NULL )) {
 768                 Debug( LDAP_DEBUG_CONFIG, "translucent: unable to open captive back-ldap\n", 0, 0, 0);
 769                 return 1;
 770         }
 771         SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NO_SCHEMA_CHECK;
 772         SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NOLASTMOD;
 773
 774         return 0;
 775 }
 776
 777 /*
 778 ** translucent_db_open()
 779 **      if the captive backend has an open() method, call it;
 780 **
 781 */
 782
 783 static int translucent_db_open(BackendDB *be, ConfigReply *cr) {
 784         slap_overinst *on = (slap_overinst *) be->bd_info;
 785         translucent_info *ov = on->on_bi.bi_private;
 786         int rc;
 787
 788         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_open\n", 0, 0, 0);
 789
 790         /* need to inherit something from the original database... */
 791         ov->db.be_def_limit = be->be_def_limit;
 792         ov->db.be_limits = be->be_limits;
 793         ov->db.be_acl = be->be_acl;
 794         ov->db.be_dfltaccess = be->be_dfltaccess;
 795
 796         if ( ov->defer_db_open )
 797                 return 0;
 798
 799         rc = backend_startup_one( &ov->db, NULL );
 800
 801         if(rc) Debug(LDAP_DEBUG_TRACE,
 802                 "translucent: bi_db_open() returned error %d\n", rc, 0, 0);
 803
 804         return(rc);
 805 }
 806
 807 /*
 808 ** translucent_db_close()
 809 **      if the captive backend has a close() method, call it;
 810 **      free any config data;
 811 **
 812 */
 813
 814 static int
 815 translucent_db_close( BackendDB *be, ConfigReply *cr )
 816 {
 817         slap_overinst *on = (slap_overinst *) be->bd_info;
 818         translucent_info *ov = on->on_bi.bi_private;
 819         int rc = 0;
 820
 821         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_close\n", 0, 0, 0);
 822
 823         if ( ov && ov->db.bd_info && ov->db.bd_info->bi_db_close ) {
 824                 rc = ov->db.bd_info->bi_db_close(&ov->db, NULL);
 825         }
 826
 827         return(rc);
 828 }
 829
 830 /*
 831 ** translucent_db_destroy()
 832 **      if the captive backend has a db_destroy() method, call it
 833 **
 834 */
 835
 836 static int
 837 translucent_db_destroy( BackendDB *be, ConfigReply *cr )
 838 {
 839         slap_overinst *on = (slap_overinst *) be->bd_info;
 840         translucent_info *ov = on->on_bi.bi_private;
 841         int rc = 0;
 842
 843         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_destroy\n", 0, 0, 0);
 844
 845         if ( ov ) {
 846                 if ( ov->db.be_private != NULL ) {
 847                         backend_stopdown_one( &ov->db );
 848                 }
 849
 850                 ch_free(ov);
 851                 on->on_bi.bi_private = NULL;
 852         }
 853
 854         return(rc);
 855 }
 856
 857 /*
 858 ** translucent_initialize()
 859 **      initialize the slap_overinst with our entry points;
 860 **
 861 */
 862
 863 int translucent_initialize() {
 864
 865         int rc;
 866
 867         Debug(LDAP_DEBUG_TRACE, "==> translucent_initialize\n", 0, 0, 0);
 868
 869         translucent.on_bi.bi_type       = "translucent";
 870         translucent.on_bi.bi_db_init    = translucent_db_init;
 871         translucent.on_bi.bi_db_config  = translucent_db_config;
 872         translucent.on_bi.bi_db_open    = translucent_db_open;
 873         translucent.on_bi.bi_db_close   = translucent_db_close;
 874         translucent.on_bi.bi_db_destroy = translucent_db_destroy;
 875         translucent.on_bi.bi_op_bind    = translucent_bind;
 876         translucent.on_bi.bi_op_add     = translucent_add;
 877         translucent.on_bi.bi_op_modify  = translucent_modify;
 878         translucent.on_bi.bi_op_modrdn  = translucent_modrdn;
 879         translucent.on_bi.bi_op_delete  = translucent_delete;
 880         translucent.on_bi.bi_op_search  = translucent_search;
 881         translucent.on_bi.bi_op_compare = translucent_compare;
 882         translucent.on_bi.bi_connection_destroy = translucent_connection_destroy;
 883
 884         translucent.on_bi.bi_cf_ocs = translucentocs;
 885         rc = config_register_schema ( translucentcfg, translucentocs );
 886         if ( rc ) return rc;
 887
 888         return(overlay_register(&translucent));
 889 }
 890
 891 #if SLAPD_OVER_TRANSLUCENT == SLAPD_MOD_DYNAMIC && defined(PIC)
 892 int init_module(int argc, char *argv[]) {
 893         return translucent_initialize();
 894 }
 895 #endif
 896
 897 #endif /* SLAPD_OVER_TRANSLUCENT */