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) glue_parent(op);
 286         return(SLAP_CB_CONTINUE);
 287 }
 288
 289 /*
 290 ** translucent_delete()
 291 **      if not bound as root, send ACCESS error;
 292 **      else return CONTINUE;
 293 **
 294 */
 295
 296 static int translucent_delete(Operation *op, SlapReply *rs) {
 297         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 298         Debug(LDAP_DEBUG_TRACE, "==> translucent_delete: %s\n",
 299                 op->o_req_dn.bv_val, 0, 0);
 300         if(!be_isroot(op)) {
 301                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 302                 send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
 303                         "user modification of overlay database not permitted");
 304                 op->o_bd->bd_info = (BackendInfo *) on;
 305                 return(rs->sr_err);
 306         }
 307         return(SLAP_CB_CONTINUE);
 308 }
 309
 310 static int
 311 translucent_tag_cb( Operation *op, SlapReply *rs )
 312 {
 313         op->o_tag = LDAP_REQ_MODIFY;
 314         op->orm_modlist = op->o_callback->sc_private;
 315         rs->sr_tag = slap_req2res( op->o_tag );
 316
 317         return SLAP_CB_CONTINUE;
 318 }
 319
 320 /*
 321 ** translucent_modify()
 322 **      modify in local backend if exists in both;
 323 **      otherwise, add to local backend;
 324 **      fail if not defined in captive backend;
 325 **
 326 */
 327
 328 static int translucent_modify(Operation *op, SlapReply *rs) {
 329         SlapReply nrs = { REP_RESULT };
 330         Operation nop = *op;
 331
 332         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 333         translucent_info *ov = on->on_bi.bi_private;
 334         Entry *e = NULL, *re = NULL;
 335         Attribute *a, *ax;
 336         Modifications *m, **mm;
 337         int del, rc, erc = 0;
 338         slap_callback cb = { 0 };
 339
 340         Debug(LDAP_DEBUG_TRACE, "==> translucent_modify: %s\n",
 341                 op->o_req_dn.bv_val, 0, 0);
 342
 343         if(ov->defer_db_open) {
 344                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 345                         "remote DB not available");
 346                 return(rs->sr_err);
 347         }
 348 /*
 349 ** fetch entry from the captive backend;
 350 ** if it did not exist, fail;
 351 ** release it, if captive backend supports this;
 352 **
 353 */
 354
 355         nop.o_bd = &ov->db;
 356         rc = ov->db.bd_info->bi_entry_get_rw(&nop, &nop.o_req_ndn, NULL, NULL, 0, &re);
 357         if(rc != LDAP_SUCCESS || re == NULL ) {
 358                 send_ldap_error((&nop), rs, LDAP_NO_SUCH_OBJECT,
 359                         "attempt to modify nonexistent local record");
 360                 return(rs->sr_err);
 361         }
 362         nop = *op;
 363 /*
 364 ** fetch entry from local backend;
 365 ** if it exists:
 366 **      foreach Modification:
 367 **          if attr not present in local:
 368 **              if Mod == LDAP_MOD_DELETE:
 369 **                  if remote attr not present, return NO_SUCH;
 370 **                  if remote attr present, drop this Mod;
 371 **              else force this Mod to LDAP_MOD_ADD;
 372 **      return CONTINUE;
 373 **
 374 */
 375
 376         op->o_bd->bd_info = (BackendInfo *) on->on_info;
 377         rc = be_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &e);
 378         op->o_bd->bd_info = (BackendInfo *) on;
 379
 380         if(e && rc == LDAP_SUCCESS) {
 381                 Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: found local entry\n", 0, 0, 0);
 382                 for(mm = &op->orm_modlist; *mm; ) {
 383                         m = *mm;
 384                         for(a = e->e_attrs; a; a = a->a_next)
 385                                 if(a->a_desc == m->sml_desc) break;
 386                         if(a) {
 387                                 mm = &m->sml_next;
 388                                 continue;               /* found local attr */
 389                         }
 390                         if(m->sml_op == LDAP_MOD_DELETE) {
 391                                 for(a = re->e_attrs; a; a = a->a_next)
 392                                         if(a->a_desc == m->sml_desc) break;
 393                                 /* not found remote attr */
 394                                 if(!a) {
 395                                         erc = LDAP_NO_SUCH_ATTRIBUTE;
 396                                         goto release;
 397                                 }
 398                                 if(ov->strict) {
 399                                         erc = LDAP_CONSTRAINT_VIOLATION;
 400                                         goto release;
 401                                 }
 402                                 Debug(LDAP_DEBUG_TRACE,
 403                                         "=> translucent_modify: silently dropping delete: %s\n",
 404                                         m->sml_desc->ad_cname.bv_val, 0, 0);
 405                                 *mm = m->sml_next;
 406                                 m->sml_next = NULL;
 407                                 slap_mods_free(m, 1);
 408                                 continue;
 409                         }
 410                         m->sml_op = LDAP_MOD_ADD;
 411                         mm = &m->sml_next;
 412                 }
 413                 erc = SLAP_CB_CONTINUE;
 414 release:
 415                 if(re) {
 416                         if(ov->db.bd_info->bi_entry_release_rw)
 417                                 ov->db.bd_info->bi_entry_release_rw(&nop, re, 0);
 418                         else
 419                                 entry_free(re);
 420                 }
 421                 op->o_bd->bd_info = (BackendInfo *) on->on_info;
 422                 be_entry_release_r(op, e);
 423                 op->o_bd->bd_info = (BackendInfo *) on;
 424                 if(erc == SLAP_CB_CONTINUE) {
 425                         return(erc);
 426                 } else if(erc) {
 427                         send_ldap_error(op, rs, erc,
 428                                 "attempt to delete nonexistent attribute");
 429                         return(erc);
 430                 }
 431         }
 432
 433         /* don't leak remote entry copy */
 434         if(re) {
 435                 if(ov->db.bd_info->bi_entry_release_rw)
 436                         ov->db.bd_info->bi_entry_release_rw(&nop, re, 0);
 437                 else
 438                         entry_free(re);
 439         }
 440 /*
 441 ** foreach Modification:
 442 **      if MOD_ADD or MOD_REPLACE, add Attribute;
 443 ** if no Modifications were suitable:
 444 **      if strict, throw CONSTRAINT_VIOLATION;
 445 **      else, return early SUCCESS;
 446 ** fabricate Entry with new Attribute chain;
 447 ** glue_parent() for this Entry;
 448 ** call bi_op_add() in local backend;
 449 **
 450 */
 451
 452         Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: fabricating local add\n", 0, 0, 0);
 453         a = NULL;
 454         for(del = 0, ax = NULL, m = op->orm_modlist; m; m = m->sml_next) {
 455                 Attribute atmp;
 456                 if(((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_ADD) &&
 457                    ((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_REPLACE)) {
 458                         Debug(LDAP_DEBUG_ANY,
 459                                 "=> translucent_modify: silently dropped modification(%d): %s\n",
 460                                 m->sml_op, m->sml_desc->ad_cname.bv_val, 0);
 461                         if((m->sml_op & LDAP_MOD_OP) == LDAP_MOD_DELETE) del++;
 462                         continue;
 463                 }
 464                 atmp.a_desc = m->sml_desc;
 465                 atmp.a_vals = m->sml_values;
 466                 atmp.a_nvals = m->sml_nvalues ? m->sml_nvalues : atmp.a_vals;
 467                 atmp.a_numvals = m->sml_numvals;
 468                 atmp.a_flags = 0;
 469                 a = attr_dup( &atmp );
 470                 a->a_next  = ax;
 471                 ax = a;
 472         }
 473
 474         if(del && ov->strict) {
 475                 attrs_free( a );
 476                 send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
 477                         "attempt to delete attributes from local database");
 478                 return(rs->sr_err);
 479         }
 480
 481         if(!ax) {
 482                 if(ov->strict) {
 483                         send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
 484                                 "modification contained other than ADD or REPLACE");
 485                         return(rs->sr_err);
 486                 }
 487                 /* rs->sr_text = "no valid modification found"; */
 488                 rs->sr_err = LDAP_SUCCESS;
 489                 send_ldap_result(op, rs);
 490                 return(rs->sr_err);
 491         }
 492
 493         e = entry_alloc();
 494         ber_dupbv( &e->e_name, &op->o_req_dn );
 495         ber_dupbv( &e->e_nname, &op->o_req_ndn );
 496         e->e_attrs = a;
 497
 498         nop.o_tag       = LDAP_REQ_ADD;
 499         nop.oq_add.rs_e = e;
 500
 501         glue_parent(&nop);
 502
 503         cb.sc_response = translucent_tag_cb;
 504         cb.sc_private = op->orm_modlist;
 505         cb.sc_next = nop.o_callback;
 506         nop.o_callback = &cb;
 507         rc = on->on_info->oi_orig->bi_op_add(&nop, &nrs);
 508         if ( nop.ora_e == e )
 509                 entry_free( e );
 510
 511         return(rc);
 512 }
 513
 514 static int translucent_compare(Operation *op, SlapReply *rs) {
 515         Operation nop = *op;
 516         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 517         translucent_info *ov = on->on_bi.bi_private;
 518         AttributeAssertion *ava = op->orc_ava;
 519         Entry *e;
 520         int rc;
 521
 522         Debug(LDAP_DEBUG_TRACE, "==> translucent_compare: <%s> %s:%s\n",
 523                 op->o_req_dn.bv_val, ava->aa_desc->ad_cname.bv_val, ava->aa_value.bv_val);
 524
 525 /*
 526 ** if the local backend has an entry for this attribute:
 527 **      CONTINUE and let it do the compare;
 528 **
 529 */
 530         op->o_bd->bd_info = (BackendInfo *) on->on_info;
 531         rc = be_entry_get_rw(op, &op->o_req_ndn, NULL, ava->aa_desc, 0, &e);
 532         if(e && rc == LDAP_SUCCESS) {
 533                 be_entry_release_r(op, e);
 534                 op->o_bd->bd_info = (BackendInfo *) on;
 535                 return(SLAP_CB_CONTINUE);
 536         }
 537         op->o_bd->bd_info = (BackendInfo *) on;
 538
 539         if(ov->defer_db_open) {
 540                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 541                         "remote DB not available");
 542                 return(rs->sr_err);
 543         }
 544 /*
 545 ** call compare() in the captive backend;
 546 ** return the result;
 547 **
 548 */
 549         nop.o_bd = &ov->db;
 550         nop.o_callback = NULL;
 551         rc = ov->db.bd_info->bi_op_compare(&nop, rs);
 552
 553         return(rc);
 554 }
 555
 556 /*
 557 ** translucent_search_cb()
 558 **      merge local data with the search result
 559 **
 560 */
 561
 562 static int translucent_search_cb(Operation *op, SlapReply *rs) {
 563         slap_overinst *on;
 564         Entry *e, *re = NULL;
 565         Attribute *a, *ax, *an, *as = NULL;
 566         Operation * original_op, local_op;
 567         int rc;
 568
 569         if(!op || !rs || rs->sr_type != REP_SEARCH || !rs->sr_entry)
 570                 return(SLAP_CB_CONTINUE);
 571
 572         Debug(LDAP_DEBUG_TRACE, "==> translucent_search_cb: %s\n",
 573                 rs->sr_entry->e_name.bv_val, 0, 0);
 574
 575         original_op = op->o_callback->sc_private;
 576         on = (slap_overinst *) original_op->o_bd->bd_info;
 577         local_op = *original_op;
 578
 579         local_op.o_bd->bd_info = (BackendInfo *) on->on_info->oi_orig;
 580         rc = be_entry_get_rw(&local_op, &rs->sr_entry->e_nname, NULL, NULL, 0, &e);
 581         local_op.o_bd->bd_info = (BackendInfo *) on;
 582
 583 /*
 584 ** if we got an entry from local backend:
 585 **      make a copy of this search result;
 586 **      foreach local attr:
 587 **              foreach search result attr:
 588 **                      if match, result attr with local attr;
 589 **                      if new local, add to list;
 590 **      append new local attrs to search result;
 591 **
 592 */
 593
 594         if(e && rc == LDAP_SUCCESS) {
 595                 re = entry_dup(rs->sr_entry);
 596                 for(ax = e->e_attrs; ax; ax = ax->a_next) {
 597 #if 0
 598                         if(is_at_operational(ax->a_desc->ad_type)) continue;
 599 #endif
 600                         for(a = re->e_attrs; a; a = a->a_next) {
 601                                 if(a->a_desc == ax->a_desc) {
 602                                         if(a->a_vals != a->a_nvals)
 603                                                 ber_bvarray_free(a->a_nvals);
 604                                         ber_bvarray_free(a->a_vals);
 605                                         a->a_vals = dup_bervarray(ax->a_vals);
 606                                         a->a_nvals = (ax->a_vals == ax->a_nvals) ?
 607                                                 a->a_vals : dup_bervarray(ax->a_nvals);
 608                                         break;
 609                                 }
 610                         }
 611                         if(a) continue;
 612                         an = attr_dup(ax);
 613                         an->a_next = as;
 614                         as = an;
 615                 }
 616                 local_op.o_bd->bd_info = (BackendInfo *) on->on_info->oi_orig;
 617                 be_entry_release_r(&local_op, e);
 618                 local_op.o_bd->bd_info = (BackendInfo *) on;
 619
 620                 /* literally append, so locals are always last */
 621                 if(as) {
 622                         if(re->e_attrs) {
 623                                 for(ax = re->e_attrs; ax->a_next; ax = ax->a_next);
 624                                 ax->a_next = as;
 625                         } else {
 626                                 re->e_attrs = as;
 627                         }
 628                 }
 629                 rs->sr_entry = re;
 630                 rs->sr_flags |= REP_ENTRY_MUSTBEFREED;
 631         }
 632
 633         return(SLAP_CB_CONTINUE);
 634 }
 635
 636 /*
 637 ** translucent_search()
 638 **      search via captive backend;
 639 **      override results with any local data;
 640 **
 641 */
 642
 643 static int translucent_search(Operation *op, SlapReply *rs) {
 644         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 645         Operation nop = *op;
 646         translucent_info *ov = on->on_bi.bi_private;
 647         slap_callback cb = { NULL, NULL, NULL, NULL };
 648
 649         Debug(LDAP_DEBUG_TRACE, "==> translucent_search: <%s> %s\n",
 650                 op->o_req_dn.bv_val, op->ors_filterstr.bv_val, 0);
 651
 652         if(ov->defer_db_open) {
 653                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 654                         "remote DB not available");
 655                 return(rs->sr_err);
 656         }
 657         cb.sc_response = (slap_response *) translucent_search_cb;
 658         cb.sc_private = op;
 659         cb.sc_next = nop.o_callback;
 660
 661         nop.o_callback = &cb;
 662         nop.o_bd = &ov->db;
 663         return (ov->db.bd_info->bi_op_search(&nop, rs));
 664 }
 665
 666
 667 /*
 668 ** translucent_bind()
 669 **      pass bind request to captive backend;
 670 **
 671 */
 672
 673 static int translucent_bind(Operation *op, SlapReply *rs) {
 674         slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
 675         Operation nop = *op;
 676         translucent_info *ov = on->on_bi.bi_private;
 677
 678         Debug(LDAP_DEBUG_TRACE, "translucent_bind: <%s> method %d\n",
 679                 op->o_req_dn.bv_val, op->orb_method, 0);
 680
 681         if(ov->defer_db_open) {
 682                 send_ldap_error(op, rs, LDAP_UNAVAILABLE,
 683                         "remote DB not available");
 684                 return(rs->sr_err);
 685         }
 686         nop.o_bd = &ov->db;
 687         return (ov->db.bd_info->bi_op_bind(&nop, rs));
 688 }
 689
 690 /*
 691 ** translucent_connection_destroy()
 692 **      pass disconnect notification to captive backend;
 693 **
 694 */
 695
 696 static int translucent_connection_destroy(BackendDB *be, Connection *conn) {
 697         slap_overinst *on = (slap_overinst *) be->bd_info;
 698         translucent_info *ov = on->on_bi.bi_private;
 699         int rc = 0;
 700
 701         Debug(LDAP_DEBUG_TRACE, "translucent_connection_destroy\n", 0, 0, 0);
 702
 703         rc = ov->db.bd_info->bi_connection_destroy(&ov->db, conn);
 704
 705         return(rc);
 706 }
 707
 708 /*
 709 ** translucent_db_config()
 710 **      pass config directives to captive backend;
 711 **      parse unrecognized directives ourselves;
 712 **
 713 */
 714
 715 static int translucent_db_config(
 716         BackendDB       *be,
 717         const char      *fname,
 718         int             lineno,
 719         int             argc,
 720         char            **argv
 721 )
 722 {
 723         slap_overinst *on = (slap_overinst *) be->bd_info;
 724         translucent_info *ov = on->on_bi.bi_private;
 725
 726         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_config: %s\n",
 727               argc ? argv[0] : "", 0, 0);
 728
 729         /* Something for the captive database? */
 730         if ( ov->db.bd_info && ov->db.bd_info->bi_db_config )
 731                 return ov->db.bd_info->bi_db_config( &ov->db, fname, lineno,
 732                         argc, argv );
 733         return SLAP_CONF_UNKNOWN;
 734 }
 735
 736 /*
 737 ** translucent_db_init()
 738 **      initialize the captive backend;
 739 **
 740 */
 741
 742 static int translucent_db_init(BackendDB *be, ConfigReply *cr) {
 743         slap_overinst *on = (slap_overinst *) be->bd_info;
 744         translucent_info *ov;
 745
 746         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_init\n", 0, 0, 0);
 747
 748         ov = ch_calloc(1, sizeof(translucent_info));
 749         on->on_bi.bi_private = ov;
 750         ov->db = *be;
 751         ov->db.be_private = NULL;
 752         ov->db.be_pcl_mutexp = &ov->db.be_pcl_mutex;
 753         ov->defer_db_open = 1;
 754
 755         if ( !backend_db_init( "ldap", &ov->db, -1, NULL )) {
 756                 Debug( LDAP_DEBUG_CONFIG, "translucent: unable to open captive back-ldap\n", 0, 0, 0);
 757                 return 1;
 758         }
 759         SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NO_SCHEMA_CHECK;
 760         SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NOLASTMOD;
 761
 762         return 0;
 763 }
 764
 765 /*
 766 ** translucent_db_open()
 767 **      if the captive backend has an open() method, call it;
 768 **
 769 */
 770
 771 static int translucent_db_open(BackendDB *be, ConfigReply *cr) {
 772         slap_overinst *on = (slap_overinst *) be->bd_info;
 773         translucent_info *ov = on->on_bi.bi_private;
 774         int rc;
 775
 776         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_open\n", 0, 0, 0);
 777
 778         /* need to inherit something from the original database... */
 779         ov->db.be_def_limit = be->be_def_limit;
 780         ov->db.be_limits = be->be_limits;
 781         ov->db.be_acl = be->be_acl;
 782         ov->db.be_dfltaccess = be->be_dfltaccess;
 783
 784         if ( ov->defer_db_open )
 785                 return 0;
 786
 787         rc = backend_startup_one( &ov->db, NULL );
 788
 789         if(rc) Debug(LDAP_DEBUG_TRACE,
 790                 "translucent: bi_db_open() returned error %d\n", rc, 0, 0);
 791
 792         return(rc);
 793 }
 794
 795 /*
 796 ** translucent_db_close()
 797 **      if the captive backend has a close() method, call it;
 798 **      free any config data;
 799 **
 800 */
 801
 802 static int
 803 translucent_db_close( BackendDB *be, ConfigReply *cr )
 804 {
 805         slap_overinst *on = (slap_overinst *) be->bd_info;
 806         translucent_info *ov = on->on_bi.bi_private;
 807         int rc = 0;
 808
 809         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_close\n", 0, 0, 0);
 810
 811         if ( ov && ov->db.bd_info && ov->db.bd_info->bi_db_close ) {
 812                 rc = ov->db.bd_info->bi_db_close(&ov->db, NULL);
 813         }
 814
 815         return(rc);
 816 }
 817
 818 /*
 819 ** translucent_db_destroy()
 820 **      if the captive backend has a db_destroy() method, call it
 821 **
 822 */
 823
 824 static int
 825 translucent_db_destroy( BackendDB *be, ConfigReply *cr )
 826 {
 827         slap_overinst *on = (slap_overinst *) be->bd_info;
 828         translucent_info *ov = on->on_bi.bi_private;
 829         int rc = 0;
 830
 831         Debug(LDAP_DEBUG_TRACE, "==> translucent_db_destroy\n", 0, 0, 0);
 832
 833         if ( ov ) {
 834                 if ( ov->db.be_private != NULL ) {
 835                         backend_stopdown_one( &ov->db );
 836                 }
 837
 838                 ch_free(ov);
 839                 on->on_bi.bi_private = NULL;
 840         }
 841
 842         return(rc);
 843 }
 844
 845 /*
 846 ** translucent_initialize()
 847 **      initialize the slap_overinst with our entry points;
 848 **
 849 */
 850
 851 int translucent_initialize() {
 852
 853         int rc;
 854
 855         Debug(LDAP_DEBUG_TRACE, "==> translucent_initialize\n", 0, 0, 0);
 856
 857         translucent.on_bi.bi_type       = "translucent";
 858         translucent.on_bi.bi_db_init    = translucent_db_init;
 859         translucent.on_bi.bi_db_config  = translucent_db_config;
 860         translucent.on_bi.bi_db_open    = translucent_db_open;
 861         translucent.on_bi.bi_db_close   = translucent_db_close;
 862         translucent.on_bi.bi_db_destroy = translucent_db_destroy;
 863         translucent.on_bi.bi_op_bind    = translucent_bind;
 864         translucent.on_bi.bi_op_add     = translucent_add;
 865         translucent.on_bi.bi_op_modify  = translucent_modify;
 866         translucent.on_bi.bi_op_modrdn  = translucent_modrdn;
 867         translucent.on_bi.bi_op_delete  = translucent_delete;
 868         translucent.on_bi.bi_op_search  = translucent_search;
 869         translucent.on_bi.bi_op_compare = translucent_compare;
 870         translucent.on_bi.bi_connection_destroy = translucent_connection_destroy;
 871
 872         translucent.on_bi.bi_cf_ocs = translucentocs;
 873         rc = config_register_schema ( translucentcfg, translucentocs );
 874         if ( rc ) return rc;
 875
 876         return(overlay_register(&translucent));
 877 }
 878
 879 #if SLAPD_OVER_TRANSLUCENT == SLAPD_MOD_DYNAMIC && defined(PIC)
 880 int init_module(int argc, char *argv[]) {
 881         return translucent_initialize();
 882 }
 883 #endif
 884
 885 #endif /* SLAPD_OVER_TRANSLUCENT */