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