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