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translucent.c

/* translucent.c - translucent proxy module */
/* $OpenLDAP: pkg/ldap/servers/slapd/overlays/translucent.c,v 1.13.2.16 2008/04/14 21:13:44 quanah Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2004-2008 The OpenLDAP Foundation.
 * Portions Copyright 2005 Symas Corporation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* ACKNOWLEDGEMENTS:
 * This work was initially developed by Symas Corp. for inclusion in
 * OpenLDAP Software.  This work was sponsored by Hewlett-Packard.
 */

#include "portable.h"

#ifdef SLAPD_OVER_TRANSLUCENT

#include <stdio.h>

#include <ac/string.h>
#include <ac/socket.h>

#include "slap.h"
#include "lutil.h"

#include "config.h"

/* config block */
typedef struct translucent_info {
      BackendDB db;                 /* captive backend */
      AttributeName *local;   /* valid attrs for local filters */
      AttributeName *remote;  /* valid attrs for remote filters */
      int strict;
      int no_glue;
      int defer_db_open;
} translucent_info;

static ConfigLDAPadd translucent_ldadd;
static ConfigCfAdd translucent_cfadd;

static ConfigDriver translucent_cf_gen;

enum {
      TRANS_LOCAL = 1,
      TRANS_REMOTE
};

static ConfigTable translucentcfg[] = {
      { "translucent_strict", "on|off", 1, 2, 0,
        ARG_ON_OFF|ARG_OFFSET,
        (void *)offsetof(translucent_info, strict),
        "( OLcfgOvAt:14.1 NAME 'olcTranslucentStrict' "
        "DESC 'Reveal attribute deletion constraint violations' "
        "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
      { "translucent_no_glue", "on|off", 1, 2, 0,
        ARG_ON_OFF|ARG_OFFSET,
        (void *)offsetof(translucent_info, no_glue),
        "( OLcfgOvAt:14.2 NAME 'olcTranslucentNoGlue' "
        "DESC 'Disable automatic glue records for ADD and MODRDN' "
        "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
      { "translucent_local", "attr[,attr...]", 1, 2, 0,
        ARG_STRING|ARG_MAGIC|TRANS_LOCAL,
        translucent_cf_gen,
        "( OLcfgOvAt:14.3 NAME 'olcTranslucentLocal' "
        "DESC 'Attributes to use in local search filter' "
        "SYNTAX OMsDirectoryString )", NULL, NULL },
      { "translucent_remote", "attr[,attr...]", 1, 2, 0,
        ARG_STRING|ARG_MAGIC|TRANS_REMOTE,
        translucent_cf_gen,
        "( OLcfgOvAt:14.4 NAME 'olcTranslucentRemote' "
        "DESC 'Attributes to use in remote search filter' "
        "SYNTAX OMsDirectoryString )", NULL, NULL },
      { NULL, NULL, 0, 0, 0, ARG_IGNORED }
};

static ConfigTable transdummy[] = {
      { "", "", 0, 0, 0, ARG_IGNORED,
            NULL, "( OLcfgGlAt:13 NAME 'olcDatabase' "
                  "DESC 'The backend type for a database instance' "
                  "SUP olcBackend SINGLE-VALUE X-ORDERED 'SIBLINGS' )", NULL, NULL },
      { NULL, NULL, 0, 0, 0, ARG_IGNORED }
};

static ConfigOCs translucentocs[] = {
      { "( OLcfgOvOc:14.1 "
        "NAME 'olcTranslucentConfig' "
        "DESC 'Translucent configuration' "
        "SUP olcOverlayConfig "
        "MAY ( olcTranslucentStrict $ olcTranslucentNoGlue $"
        " olcTranslucentLocal $ olcTranslucentRemote ) )",
        Cft_Overlay, translucentcfg, NULL, translucent_cfadd },
      { "( OLcfgOvOc:14.2 "
        "NAME 'olcTranslucentDatabase' "
        "DESC 'Translucent target database configuration' "
        "AUXILIARY )", Cft_Misc, transdummy, translucent_ldadd },
      { NULL, 0, NULL }
};
/* for translucent_init() */

static int
translucent_ldadd_cleanup( ConfigArgs *ca )
{
      slap_overinst *on = ca->ca_private;
      translucent_info *ov = on->on_bi.bi_private;

      ov->defer_db_open = 0;
      return backend_startup_one( ca->be, &ca->reply );
}

static int
translucent_ldadd( CfEntryInfo *cei, Entry *e, ConfigArgs *ca )
{
      slap_overinst *on;
      translucent_info *ov;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_ldadd\n", 0, 0, 0);

      if ( cei->ce_type != Cft_Overlay || !cei->ce_bi ||
           cei->ce_bi->bi_cf_ocs != translucentocs )
            return LDAP_CONSTRAINT_VIOLATION;

      on = (slap_overinst *)cei->ce_bi;
      ov = on->on_bi.bi_private;
      ca->be = &ov->db;
      ca->ca_private = on;
      if ( CONFIG_ONLINE_ADD( ca ))
            ca->cleanup = translucent_ldadd_cleanup;
      else
            ov->defer_db_open = 0;

      return LDAP_SUCCESS;
}

static int
translucent_cfadd( Operation *op, SlapReply *rs, Entry *e, ConfigArgs *ca )
{
      CfEntryInfo *cei = e->e_private;
      slap_overinst *on = (slap_overinst *)cei->ce_bi;
      translucent_info *ov = on->on_bi.bi_private;
      struct berval bv;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_cfadd\n", 0, 0, 0);

      /* FIXME: should not hardcode "olcDatabase" here */
      bv.bv_len = snprintf( ca->cr_msg, sizeof( ca->cr_msg ),
            "olcDatabase=%s", ov->db.bd_info->bi_type );
      if ( bv.bv_len < 0 || bv.bv_len >= sizeof( ca->cr_msg ) ) {
            return -1;
      }
      bv.bv_val = ca->cr_msg;
      ca->be = &ov->db;
      ov->defer_db_open = 0;

      /* We can only create this entry if the database is table-driven
       */
      if ( ov->db.bd_info->bi_cf_ocs )
            config_build_entry( op, rs, cei, ca, &bv,
                            ov->db.bd_info->bi_cf_ocs,
                            &translucentocs[1] );

      return 0;
}

static int
translucent_cf_gen( ConfigArgs *c )
{
      slap_overinst     *on = (slap_overinst *)c->bi;
      translucent_info *ov = on->on_bi.bi_private;
      AttributeName **an, *a2;
      int i;

      if ( c->type == TRANS_LOCAL )
            an = &ov->local;
      else
            an = &ov->remote;

      if ( c->op == SLAP_CONFIG_EMIT ) {
            if ( !*an )
                  return 1;
            for ( i = 0; !BER_BVISNULL(&(*an)[i].an_name); i++ ) {
                  value_add_one( &c->rvalue_vals, &(*an)[i].an_name );
            }
            return ( i < 1 );
      } else if ( c->op == LDAP_MOD_DELETE ) {
            if ( c->valx < 0 ) {
                  anlist_free( *an, 1, NULL );
                  *an = NULL;
            } else {
                  i = c->valx;
                  ch_free( (*an)[i].an_name.bv_val );
                  do {
                        (*an)[i] = (*an)[i+1];
                  } while ( !BER_BVISNULL( &(*an)[i].an_name ));
            }
            return 0;
      }
      a2 = str2anlist( *an, c->argv[1], "," );
      if ( !a2 ) {
            snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse attribute %s",
                  c->argv[0], c->argv[1] );
            Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
                  "%s: %s\n", c->log, c->cr_msg, 0 );
            return ARG_BAD_CONF;
      }
      *an = a2;
      return 0;
}

static slap_overinst translucent;

/*
** glue_parent()
**    call syncrepl_add_glue() with the parent suffix;
**
*/

static struct berval glue[] = { BER_BVC("top"), BER_BVC("glue"), BER_BVNULL };

void glue_parent(Operation *op) {
      Operation nop = *op;
      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      struct berval ndn = BER_BVNULL;
      Attribute *a;
      Entry *e;
      struct berval     pdn;

      dnParent( &op->o_req_ndn, &pdn );
      ber_dupbv_x( &ndn, &pdn, op->o_tmpmemctx );

      Debug(LDAP_DEBUG_TRACE, "=> glue_parent: fabricating glue for <%s>\n", ndn.bv_val, 0, 0);

      e = entry_alloc();
      e->e_id = NOID;
      ber_dupbv(&e->e_name, &ndn);
      ber_dupbv(&e->e_nname, &ndn);

      a = attr_alloc( slap_schema.si_ad_objectClass );
      a->a_numvals = 2;
      a->a_vals = ch_malloc(sizeof(struct berval) * 3);
      ber_dupbv(&a->a_vals[0], &glue[0]);
      ber_dupbv(&a->a_vals[1], &glue[1]);
      ber_dupbv(&a->a_vals[2], &glue[2]);
      a->a_nvals = a->a_vals;
      a->a_next = e->e_attrs;
      e->e_attrs = a;

      a = attr_alloc( slap_schema.si_ad_structuralObjectClass );
      a->a_numvals = 1;
      a->a_vals = ch_malloc(sizeof(struct berval) * 2);
      ber_dupbv(&a->a_vals[0], &glue[1]);
      ber_dupbv(&a->a_vals[1], &glue[2]);
      a->a_nvals = a->a_vals;
      a->a_next = e->e_attrs;
      e->e_attrs = a;

      nop.o_req_dn = ndn;
      nop.o_req_ndn = ndn;
      nop.ora_e = e;

      nop.o_bd->bd_info = (BackendInfo *) on->on_info->oi_orig;
      syncrepl_add_glue(&nop, e);
      nop.o_bd->bd_info = (BackendInfo *) on;

      op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );

      return;
}

/*
** dup_bervarray()
**    copy a BerVarray;
*/

BerVarray dup_bervarray(BerVarray b) {
      int i, len;
      BerVarray nb;
      for(len = 0; b[len].bv_val; len++);
      nb = ch_malloc((len+1) * sizeof(BerValue));
      for(i = 0; i < len; i++) ber_dupbv(&nb[i], &b[i]);
      nb[len].bv_val = NULL;
      nb[len].bv_len = 0;
      return(nb);
}

/*
** free_attr_chain()
**    free only the Attribute*, not the contents;
**
*/
void free_attr_chain(Attribute *b) {
      Attribute *a;
      for(a=b; a; a=a->a_next) {
            a->a_vals = NULL;
            a->a_nvals = NULL;
      }
      attrs_free( b );
      return;
}

/*
** translucent_add()
**    if not bound as root, send ACCESS error;
**    if glue, glue_parent();
**    return CONTINUE;
**
*/

static int translucent_add(Operation *op, SlapReply *rs) {
      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      Debug(LDAP_DEBUG_TRACE, "==> translucent_add: %s\n",
            op->o_req_dn.bv_val, 0, 0);
      if(!be_isroot(op)) {
            op->o_bd->bd_info = (BackendInfo *) on->on_info;
            send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
                  "user modification of overlay database not permitted");
            op->o_bd->bd_info = (BackendInfo *) on;
            return(rs->sr_err);
      }
      if(!ov->no_glue) glue_parent(op);
      return(SLAP_CB_CONTINUE);
}

/*
** translucent_modrdn()
**    if not bound as root, send ACCESS error;
**    if !glue, glue_parent();
**    else return CONTINUE;
**
*/

static int translucent_modrdn(Operation *op, SlapReply *rs) {
      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      Debug(LDAP_DEBUG_TRACE, "==> translucent_modrdn: %s -> %s\n",
            op->o_req_dn.bv_val, op->orr_newrdn.bv_val, 0);
      if(!be_isroot(op)) {
            op->o_bd->bd_info = (BackendInfo *) on->on_info;
            send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
                  "user modification of overlay database not permitted");
            op->o_bd->bd_info = (BackendInfo *) on;
            return(rs->sr_err);
      }
      if(!ov->no_glue) {
            op->o_tag = LDAP_REQ_ADD;
            glue_parent(op);
            op->o_tag = LDAP_REQ_MODRDN;
      }
      return(SLAP_CB_CONTINUE);
}

/*
** translucent_delete()
**    if not bound as root, send ACCESS error;
**    else return CONTINUE;
**
*/

static int translucent_delete(Operation *op, SlapReply *rs) {
      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      Debug(LDAP_DEBUG_TRACE, "==> translucent_delete: %s\n",
            op->o_req_dn.bv_val, 0, 0);
      if(!be_isroot(op)) {
            op->o_bd->bd_info = (BackendInfo *) on->on_info;
            send_ldap_error(op, rs, LDAP_INSUFFICIENT_ACCESS,
                  "user modification of overlay database not permitted");
            op->o_bd->bd_info = (BackendInfo *) on;
            return(rs->sr_err);
      }
      return(SLAP_CB_CONTINUE);
}

static int
translucent_tag_cb( Operation *op, SlapReply *rs )
{
      op->o_tag = LDAP_REQ_MODIFY;
      op->orm_modlist = op->o_callback->sc_private;
      rs->sr_tag = slap_req2res( op->o_tag );

      return SLAP_CB_CONTINUE;
}

/*
** translucent_modify()
**    modify in local backend if exists in both;
**    otherwise, add to local backend;
**    fail if not defined in captive backend;
**
*/

static int translucent_modify(Operation *op, SlapReply *rs) {
      SlapReply nrs = { REP_RESULT };

      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      Entry *e = NULL, *re = NULL;
      Attribute *a, *ax;
      Modifications *m, **mm;
      BackendDB *db;
      int del, rc, erc = 0;
      slap_callback cb = { 0 };

      Debug(LDAP_DEBUG_TRACE, "==> translucent_modify: %s\n",
            op->o_req_dn.bv_val, 0, 0);

      if(ov->defer_db_open) {
            send_ldap_error(op, rs, LDAP_UNAVAILABLE,
                  "remote DB not available");
            return(rs->sr_err);
      }
/*
** fetch entry from the captive backend;
** if it did not exist, fail;
** release it, if captive backend supports this;
**
*/

      db = op->o_bd;
      op->o_bd = &ov->db;
      rc = ov->db.bd_info->bi_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &re);
      if(rc != LDAP_SUCCESS || re == NULL ) {
            send_ldap_error((op), rs, LDAP_NO_SUCH_OBJECT,
                  "attempt to modify nonexistent local record");
            return(rs->sr_err);
      }
      op->o_bd = db;
/*
** fetch entry from local backend;
** if it exists:
**    foreach Modification:
**        if attr not present in local:
**          if Mod == LDAP_MOD_DELETE:
**              if remote attr not present, return NO_SUCH;
**              if remote attr present, drop this Mod;
**          else force this Mod to LDAP_MOD_ADD;
**    return CONTINUE;
**
*/

      op->o_bd->bd_info = (BackendInfo *) on->on_info;
      rc = be_entry_get_rw(op, &op->o_req_ndn, NULL, NULL, 0, &e);
      op->o_bd->bd_info = (BackendInfo *) on;

      if(e && rc == LDAP_SUCCESS) {
            Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: found local entry\n", 0, 0, 0);
            for(mm = &op->orm_modlist; *mm; ) {
                  m = *mm;
                  for(a = e->e_attrs; a; a = a->a_next)
                        if(a->a_desc == m->sml_desc) break;
                  if(a) {
                        mm = &m->sml_next;
                        continue;         /* found local attr */
                  }
                  if(m->sml_op == LDAP_MOD_DELETE) {
                        for(a = re->e_attrs; a; a = a->a_next)
                              if(a->a_desc == m->sml_desc) break;
                        /* not found remote attr */
                        if(!a) {
                              erc = LDAP_NO_SUCH_ATTRIBUTE;
                              goto release;
                        }
                        if(ov->strict) {
                              erc = LDAP_CONSTRAINT_VIOLATION;
                              goto release;
                        }
                        Debug(LDAP_DEBUG_TRACE,
                              "=> translucent_modify: silently dropping delete: %s\n",
                              m->sml_desc->ad_cname.bv_val, 0, 0);
                        *mm = m->sml_next;
                        m->sml_next = NULL;
                        slap_mods_free(m, 1);
                        continue;
                  }
                  m->sml_op = LDAP_MOD_ADD;
                  mm = &m->sml_next;
            }
            erc = SLAP_CB_CONTINUE;
release:
            if(re) {
                  if(ov->db.bd_info->bi_entry_release_rw) {
                        op->o_bd = &ov->db;
                        ov->db.bd_info->bi_entry_release_rw(op, re, 0);
                        op->o_bd = db;
                  } else
                        entry_free(re);
            }
            op->o_bd->bd_info = (BackendInfo *) on->on_info;
            be_entry_release_r(op, e);
            op->o_bd->bd_info = (BackendInfo *) on;
            if(erc == SLAP_CB_CONTINUE) {
                  return(erc);
            } else if(erc) {
                  send_ldap_error(op, rs, erc,
                        "attempt to delete nonexistent attribute");
                  return(erc);
            }
      }

      /* don't leak remote entry copy */
      if(re) {
            if(ov->db.bd_info->bi_entry_release_rw) {
                  op->o_bd = &ov->db;
                  ov->db.bd_info->bi_entry_release_rw(op, re, 0);
                  op->o_bd = db;
            } else
                  entry_free(re);
      }
/*
** foreach Modification:
**    if MOD_ADD or MOD_REPLACE, add Attribute;
** if no Modifications were suitable:
**    if strict, throw CONSTRAINT_VIOLATION;
**    else, return early SUCCESS;
** fabricate Entry with new Attribute chain;
** glue_parent() for this Entry;
** call bi_op_add() in local backend;
**
*/

      Debug(LDAP_DEBUG_TRACE, "=> translucent_modify: fabricating local add\n", 0, 0, 0);
      a = NULL;
      for(del = 0, ax = NULL, m = op->orm_modlist; m; m = m->sml_next) {
            Attribute atmp;
            if(((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_ADD) &&
               ((m->sml_op & LDAP_MOD_OP) != LDAP_MOD_REPLACE)) {
                  Debug(LDAP_DEBUG_ANY,
                        "=> translucent_modify: silently dropped modification(%d): %s\n",
                        m->sml_op, m->sml_desc->ad_cname.bv_val, 0);
                  if((m->sml_op & LDAP_MOD_OP) == LDAP_MOD_DELETE) del++;
                  continue;
            }
            atmp.a_desc = m->sml_desc;
            atmp.a_vals = m->sml_values;
            atmp.a_nvals = m->sml_nvalues ? m->sml_nvalues : atmp.a_vals;
            atmp.a_numvals = m->sml_numvals;
            atmp.a_flags = 0;
            a = attr_dup( &atmp );
            a->a_next  = ax;
            ax = a;
      }

      if(del && ov->strict) {
            attrs_free( a );
            send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
                  "attempt to delete attributes from local database");
            return(rs->sr_err);
      }

      if(!ax) {
            if(ov->strict) {
                  send_ldap_error(op, rs, LDAP_CONSTRAINT_VIOLATION,
                        "modification contained other than ADD or REPLACE");
                  return(rs->sr_err);
            }
            /* rs->sr_text = "no valid modification found"; */
            rs->sr_err = LDAP_SUCCESS;
            send_ldap_result(op, rs);
            return(rs->sr_err);
      }

      e = entry_alloc();
      ber_dupbv( &e->e_name, &op->o_req_dn );
      ber_dupbv( &e->e_nname, &op->o_req_ndn );
      e->e_attrs = a;

      op->o_tag   = LDAP_REQ_ADD;
      cb.sc_response = translucent_tag_cb;
      cb.sc_private = op->orm_modlist;
      op->oq_add.rs_e   = e;

      glue_parent(op);

      cb.sc_next = op->o_callback;
      op->o_callback = &cb;
      rc = on->on_info->oi_orig->bi_op_add(op, &nrs);
      if ( op->ora_e == e )
            entry_free( e );
      op->o_callback = cb.sc_next;

      return(rc);
}

static int translucent_compare(Operation *op, SlapReply *rs) {
      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      AttributeAssertion *ava = op->orc_ava;
      Entry *e;
      BackendDB *db;
      int rc;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_compare: <%s> %s:%s\n",
            op->o_req_dn.bv_val, ava->aa_desc->ad_cname.bv_val, ava->aa_value.bv_val);

/*
** if the local backend has an entry for this attribute:
**    CONTINUE and let it do the compare;
**
*/
      rc = overlay_entry_get_ov(op, &op->o_req_ndn, NULL, ava->aa_desc, 0, &e, on);
      if(rc == LDAP_SUCCESS && e) {
            overlay_entry_release_ov(op, e, 0, on);
            return(SLAP_CB_CONTINUE);
      }

      if(ov->defer_db_open) {
            send_ldap_error(op, rs, LDAP_UNAVAILABLE,
                  "remote DB not available");
            return(rs->sr_err);
      }
/*
** call compare() in the captive backend;
** return the result;
**
*/
      db = op->o_bd;
      op->o_bd = &ov->db;
      rc = ov->db.bd_info->bi_op_compare(op, rs);
      op->o_bd = db;

      return(rc);
}

/*
** translucent_search_cb()
**    merge local data with remote data
**
** Four cases:
** 1: remote search, no local filter
**    merge data and send immediately
** 2: remote search, with local filter
**    merge data and save
** 3: local search, no remote filter
**    merge data and send immediately
** 4: local search, with remote filter
**    check list, merge, send, delete
*/

#define     RMT_SIDE    0
#define     LCL_SIDE    1
#define     USE_LIST    2

typedef struct trans_ctx {
      BackendDB *db;
      slap_overinst *on;
      Filter *orig;
      Avlnode *list;
      int step;
} trans_ctx;

static int translucent_search_cb(Operation *op, SlapReply *rs) {
      trans_ctx *tc;
      BackendDB *db;
      slap_overinst *on;
      translucent_info *ov;
      Entry *le, *re;
      Attribute *a, *ax, *an, *as = NULL;
      int rc;

      tc = op->o_callback->sc_private;

      /* Don't let the op complete while we're gathering data */
      if ( rs->sr_type == REP_RESULT && ( tc->step & USE_LIST ))
            return 0;

      if(!op || !rs || rs->sr_type != REP_SEARCH || !rs->sr_entry)
            return(SLAP_CB_CONTINUE);

      Debug(LDAP_DEBUG_TRACE, "==> translucent_search_cb: %s\n",
            rs->sr_entry->e_name.bv_val, 0, 0);

      on = tc->on;
      ov = on->on_bi.bi_private;

      db = op->o_bd;
      re = NULL;

      /* If we have local, get remote */
      if ( tc->step & LCL_SIDE ) {
            le = rs->sr_entry;
            /* If entry is already on list, use it */
            if ( tc->step & USE_LIST ) {
                  re = tavl_delete( &tc->list, le, entry_dn_cmp );
                  if ( re ) {
                        if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
                              rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
                              be_entry_release_r( op, rs->sr_entry );
                        }
                        if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
                              rs->sr_flags ^= REP_ENTRY_MUSTBEFREED;
                              entry_free( rs->sr_entry );
                        }
                        rc = test_filter( op, re, tc->orig );
                        if ( rc == LDAP_COMPARE_TRUE ) {
                              rs->sr_flags |= REP_ENTRY_MUSTBEFREED;
                              rs->sr_entry = re;
                              return SLAP_CB_CONTINUE;
                        } else {
                              entry_free( re );
                              rs->sr_entry = NULL;
                              return 0;
                        }
                  }
            }
            op->o_bd = &ov->db;
            rc = be_entry_get_rw( op, &rs->sr_entry->e_nname, NULL, NULL, 0, &re );
            if ( rc == LDAP_SUCCESS && re ) {
                  Entry *tmp = entry_dup( re );
                  be_entry_release_r( op, re );
                  re = tmp;
            }
      } else {
      /* Else we have remote, get local */
            op->o_bd = tc->db;
            rc = overlay_entry_get_ov(op, &rs->sr_entry->e_nname, NULL, NULL, 0, &le, on);
            if ( rc == LDAP_SUCCESS && le ) {
                  re = entry_dup( rs->sr_entry );
                  if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
                        rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
                        be_entry_release_r( op, rs->sr_entry );
                  }
                  if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
                        rs->sr_flags ^= REP_ENTRY_MUSTBEFREED;
                        entry_free( rs->sr_entry );
                  }
            } else {
                  le = NULL;
            }
      }

/*
** if we got remote and local entry:
**    foreach local attr:
**          foreach remote attr:
**                if match, remote attr with local attr;
**                if new local, add to list;
**    append new local attrs to remote;
**
*/

      if ( re && le ) {
            for(ax = le->e_attrs; ax; ax = ax->a_next) {
                  for(a = re->e_attrs; a; a = a->a_next) {
                        if(a->a_desc == ax->a_desc) {
                              if(a->a_vals != a->a_nvals)
                                    ber_bvarray_free(a->a_nvals);
                              ber_bvarray_free(a->a_vals);
                              a->a_vals = dup_bervarray(ax->a_vals);
                              a->a_nvals = (ax->a_vals == ax->a_nvals) ?
                                    a->a_vals : dup_bervarray(ax->a_nvals);
                              break;
                        }
                  }
                  if(a) continue;
                  an = attr_dup(ax);
                  an->a_next = as;
                  as = an;
            }
            /* Dispose of local entry */
            if ( tc->step & LCL_SIDE ) {
                  if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
                        rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
                        be_entry_release_r( op, rs->sr_entry );
                  }
                  if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
                        rs->sr_flags ^= REP_ENTRY_MUSTBEFREED;
                        entry_free( rs->sr_entry );
                  }
            } else {
                  overlay_entry_release_ov(op, le, 0, on);
            }

            /* literally append, so locals are always last */
            if(as) {
                  if(re->e_attrs) {
                        for(ax = re->e_attrs; ax->a_next; ax = ax->a_next);
                        ax->a_next = as;
                  } else {
                        re->e_attrs = as;
                  }
            }
            /* If both filters, save entry for later */
            if ( tc->step == (USE_LIST|RMT_SIDE) ) {
                  tavl_insert( &tc->list, re, entry_dn_cmp, avl_dup_error );
                  rs->sr_entry = NULL;
                  rc = 0;
            } else {
            /* send it now */
                  rs->sr_entry = re;
                  rs->sr_flags |= REP_ENTRY_MUSTBEFREED;
                  rc = SLAP_CB_CONTINUE;
            }
      } else if ( le ) {
      /* Only a local entry: remote was deleted
       * Ought to delete the local too...
       */
            rc = 0;
      } else if ( tc->step & USE_LIST ) {
      /* Only a remote entry, but both filters:
       * Test the complete filter
       */
            rc = test_filter( op, rs->sr_entry, tc->orig );
            if ( rc == LDAP_COMPARE_TRUE ) {
                  rc = SLAP_CB_CONTINUE;
            } else {
                  rc = 0;
            }
      } else {
      /* Only a remote entry, only remote filter:
       * just pass thru
       */
            rc = SLAP_CB_CONTINUE;
      }

      op->o_bd = db;
      return rc;
}

/* Dup the filter, excluding invalid elements */
static Filter *
trans_filter_dup(Operation *op, Filter *f, AttributeName *an)
{
      Filter *n = NULL;

      if ( !f )
            return NULL;

      switch( f->f_choice & SLAPD_FILTER_MASK ) {
      case SLAPD_FILTER_COMPUTED:
            n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
            n->f_choice = f->f_choice;
            n->f_result = f->f_result;
            n->f_next = NULL;
            break;

      case LDAP_FILTER_PRESENT:
            if ( ad_inlist( f->f_desc, an )) {
                  n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
                  n->f_choice = f->f_choice;
                  n->f_desc = f->f_desc;
                  n->f_next = NULL;
            }
            break;

      case LDAP_FILTER_EQUALITY:
      case LDAP_FILTER_GE:
      case LDAP_FILTER_LE:
      case LDAP_FILTER_APPROX:
      case LDAP_FILTER_SUBSTRINGS:
      case LDAP_FILTER_EXT:
            if ( !f->f_av_desc || ad_inlist( f->f_av_desc, an )) {
                  n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
                  n->f_choice = f->f_choice;
                  n->f_ava = f->f_ava;
                  n->f_next = NULL;
            }
            break;

      case LDAP_FILTER_AND:
      case LDAP_FILTER_OR:
      case LDAP_FILTER_NOT: {
            Filter **p;

            n = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
            n->f_choice = f->f_choice;
            n->f_next = NULL;

            for ( p = &n->f_list, f = f->f_list; f; f = f->f_next ) {
                  *p = trans_filter_dup( op, f, an );
                  if ( !*p )
                        continue;
                  p = &(*p)->f_next;
            }
            /* nothing valid in this list */
            if ( !n->f_list ) {
                  op->o_tmpfree( n, op->o_tmpmemctx );
                  return NULL;
            }
            /* Only 1 element in this list */
            if ((n->f_choice & SLAPD_FILTER_MASK) != LDAP_FILTER_NOT &&
                  !n->f_list->f_next ) {
                  f = n->f_list;
                  *n = *f;
                  op->o_tmpfree( f, op->o_tmpmemctx );
            }
            break;
      }
      }
      return n;
}

static void
trans_filter_free( Operation *op, Filter *f )
{
      Filter *n, *p, *next;

      f->f_choice &= SLAPD_FILTER_MASK;

      switch( f->f_choice ) {
      case LDAP_FILTER_AND:
      case LDAP_FILTER_OR:
      case LDAP_FILTER_NOT:
            /* Free in reverse order */
            n = NULL;
            for ( p = f->f_list; p; p = next ) {
                  next = p->f_next;
                  p->f_next = n;
                  n = p;
            }
            for ( p = n; p; p = next ) {
                  next = p->f_next;
                  trans_filter_free( op, p );
            }
            break;
      default:
            break;
      }
      op->o_tmpfree( f, op->o_tmpmemctx );
}

/*
** translucent_search()
**    search via captive backend;
**    override results with any local data;
**
*/

static int translucent_search(Operation *op, SlapReply *rs) {
      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      slap_callback cb = { NULL, NULL, NULL, NULL };
      trans_ctx tc;
      Filter *fl, *fr;
      struct berval fbv;
      int rc = 0;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_search: <%s> %s\n",
            op->o_req_dn.bv_val, op->ors_filterstr.bv_val, 0);

      if(ov->defer_db_open) {
            send_ldap_error(op, rs, LDAP_UNAVAILABLE,
                  "remote DB not available");
            return(rs->sr_err);
      }

      fr = ov->remote ? trans_filter_dup( op, op->ors_filter, ov->remote ) : NULL;
      fl = ov->local ? trans_filter_dup( op, op->ors_filter, ov->local ) : NULL;
      cb.sc_response = (slap_response *) translucent_search_cb;
      cb.sc_private = &tc;
      cb.sc_next = op->o_callback;

      tc.db = op->o_bd;
      tc.on = on;
      tc.orig = op->ors_filter;
      tc.list = NULL;
      tc.step = 0;
      fbv = op->ors_filterstr;

      op->o_callback = &cb;

      if ( fr || !fl ) {
            op->o_bd = &ov->db;
            tc.step |= RMT_SIDE;
            if ( fl ) {
                  tc.step |= USE_LIST;
                  op->ors_filter = fr;
                  filter2bv_x( op, fr, &op->ors_filterstr );
            }
            rc = ov->db.bd_info->bi_op_search(op, rs);
            op->o_bd = tc.db;
            if ( fl ) {
                  op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
            }
      }
      if ( fl && !rc ) {
            tc.step |= LCL_SIDE;
            op->ors_filter = fl;
            filter2bv_x( op, fl, &op->ors_filterstr );
            rc = overlay_op_walk( op, rs, op_search, on->on_info, on->on_next );
            op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
      }
      op->ors_filterstr = fbv;
      op->ors_filter = tc.orig;
      op->o_callback = cb.sc_next;
      /* Send out anything remaining on the list and finish */
      if ( tc.step & USE_LIST ) {
            if ( tc.list ) {
                  Avlnode *av;

                  av = tavl_end( tc.list, TAVL_DIR_LEFT );
                  while ( av ) {
                        rs->sr_entry = av->avl_data;
                        rc = test_filter( op, rs->sr_entry, op->ors_filter );
                        if ( rc == LDAP_COMPARE_TRUE ) {
                              rs->sr_flags = REP_ENTRY_MUSTBEFREED;
                              rc = send_search_entry( op, rs );
                              if ( rc ) break;
                        } else {
                              entry_free( rs->sr_entry );
                        }
                        av = tavl_next( av, TAVL_DIR_RIGHT );
                  }
                  tavl_free( tc.list, NULL );
                  rs->sr_entry = NULL;
            }
            send_ldap_result( op, rs );
      }

      /* Free in reverse order */
      if ( fl )
            trans_filter_free( op, fl );
      if ( fr )
            trans_filter_free( op, fr );

      return rc;
}


/*
** translucent_bind()
**    pass bind request to captive backend;
**
*/

static int translucent_bind(Operation *op, SlapReply *rs) {
      slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      BackendDB *db;
      int rc;

      Debug(LDAP_DEBUG_TRACE, "translucent_bind: <%s> method %d\n",
            op->o_req_dn.bv_val, op->orb_method, 0);

      if(ov->defer_db_open) {
            send_ldap_error(op, rs, LDAP_UNAVAILABLE,
                  "remote DB not available");
            return(rs->sr_err);
      }
      db = op->o_bd;
      op->o_bd = &ov->db;
      rc = ov->db.bd_info->bi_op_bind(op, rs);
      op->o_bd = db;
      return rc;
}

/*
** translucent_connection_destroy()
**    pass disconnect notification to captive backend;
**
*/

static int translucent_connection_destroy(BackendDB *be, Connection *conn) {
      slap_overinst *on = (slap_overinst *) be->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      int rc = 0;

      Debug(LDAP_DEBUG_TRACE, "translucent_connection_destroy\n", 0, 0, 0);

      rc = ov->db.bd_info->bi_connection_destroy(&ov->db, conn);

      return(rc);
}

/*
** translucent_db_config()
**    pass config directives to captive backend;
**    parse unrecognized directives ourselves;
**
*/

static int translucent_db_config(
      BackendDB   *be,
      const char  *fname,
      int         lineno,
      int         argc,
      char        **argv
)
{
      slap_overinst *on = (slap_overinst *) be->bd_info;
      translucent_info *ov = on->on_bi.bi_private;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_db_config: %s\n",
            argc ? argv[0] : "", 0, 0);

      /* Something for the captive database? */
      if ( ov->db.bd_info && ov->db.bd_info->bi_db_config )
            return ov->db.bd_info->bi_db_config( &ov->db, fname, lineno,
                  argc, argv );
      return SLAP_CONF_UNKNOWN;
}

/*
** translucent_db_init()
**    initialize the captive backend;
**
*/

static int translucent_db_init(BackendDB *be, ConfigReply *cr) {
      slap_overinst *on = (slap_overinst *) be->bd_info;
      translucent_info *ov;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_db_init\n", 0, 0, 0);

      ov = ch_calloc(1, sizeof(translucent_info));
      on->on_bi.bi_private = ov;
      ov->db = *be;
      ov->db.be_private = NULL;
      ov->db.be_pcl_mutexp = &ov->db.be_pcl_mutex;
      ov->defer_db_open = 1;

      if ( !backend_db_init( "ldap", &ov->db, -1, NULL )) {
            Debug( LDAP_DEBUG_CONFIG, "translucent: unable to open captive back-ldap\n", 0, 0, 0);
            return 1;
      }
      SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NO_SCHEMA_CHECK;
      SLAP_DBFLAGS(be) |= SLAP_DBFLAG_NOLASTMOD;

      return 0;
}

/*
** translucent_db_open()
**    if the captive backend has an open() method, call it;
**
*/

static int translucent_db_open(BackendDB *be, ConfigReply *cr) {
      slap_overinst *on = (slap_overinst *) be->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      int rc;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_db_open\n", 0, 0, 0);

      /* need to inherit something from the original database... */
      ov->db.be_def_limit = be->be_def_limit;
      ov->db.be_limits = be->be_limits;
      ov->db.be_acl = be->be_acl;
      ov->db.be_dfltaccess = be->be_dfltaccess;

      if ( ov->defer_db_open )
            return 0;

      rc = backend_startup_one( &ov->db, cr );

      if(rc) Debug(LDAP_DEBUG_TRACE,
            "translucent: bi_db_open() returned error %d\n", rc, 0, 0);

      return(rc);
}

/*
** translucent_db_close()
**    if the captive backend has a close() method, call it
**
*/

static int
translucent_db_close( BackendDB *be, ConfigReply *cr )
{
      slap_overinst *on = (slap_overinst *) be->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      int rc = 0;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_db_close\n", 0, 0, 0);

      if ( ov && ov->db.bd_info && ov->db.bd_info->bi_db_close ) {
            rc = ov->db.bd_info->bi_db_close(&ov->db, NULL);
      }

      return(rc);
}

/*
** translucent_db_destroy()
**    if the captive backend has a db_destroy() method, call it;
**    free any config data
**
*/

static int
translucent_db_destroy( BackendDB *be, ConfigReply *cr )
{
      slap_overinst *on = (slap_overinst *) be->bd_info;
      translucent_info *ov = on->on_bi.bi_private;
      int rc = 0;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_db_destroy\n", 0, 0, 0);

      if ( ov ) {
            if ( ov->remote )
                  anlist_free( ov->remote, 1, NULL );
            if ( ov->local )
                  anlist_free( ov->local, 1, NULL );
            if ( ov->db.be_private != NULL ) {
                  backend_stopdown_one( &ov->db );
            }

            ch_free(ov);
            on->on_bi.bi_private = NULL;
      }

      return(rc);
}

/*
** translucent_initialize()
**    initialize the slap_overinst with our entry points;
**
*/

int translucent_initialize() {

      int rc;

      Debug(LDAP_DEBUG_TRACE, "==> translucent_initialize\n", 0, 0, 0);

      translucent.on_bi.bi_type     = "translucent";
      translucent.on_bi.bi_db_init  = translucent_db_init;
      translucent.on_bi.bi_db_config      = translucent_db_config;
      translucent.on_bi.bi_db_open  = translucent_db_open;
      translucent.on_bi.bi_db_close = translucent_db_close;
      translucent.on_bi.bi_db_destroy     = translucent_db_destroy;
      translucent.on_bi.bi_op_bind  = translucent_bind;
      translucent.on_bi.bi_op_add   = translucent_add;
      translucent.on_bi.bi_op_modify      = translucent_modify;
      translucent.on_bi.bi_op_modrdn      = translucent_modrdn;
      translucent.on_bi.bi_op_delete      = translucent_delete;
      translucent.on_bi.bi_op_search      = translucent_search;
      translucent.on_bi.bi_op_compare     = translucent_compare;
      translucent.on_bi.bi_connection_destroy = translucent_connection_destroy;

      translucent.on_bi.bi_cf_ocs = translucentocs;
      rc = config_register_schema ( translucentcfg, translucentocs );
      if ( rc ) return rc;

      return(overlay_register(&translucent));
}

#if SLAPD_OVER_TRANSLUCENT == SLAPD_MOD_DYNAMIC && defined(PIC)
int init_module(int argc, char *argv[]) {
      return translucent_initialize();
}
#endif

#endif /* SLAPD_OVER_TRANSLUCENT */

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