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dynlist.c

/* dynlist.c - dynamic list overlay */
/* $OpenLDAP: pkg/ldap/servers/slapd/overlays/dynlist.c,v 1.20.2.14 2008/05/01 21:19:41 quanah Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2003-2008 The OpenLDAP Foundation.
 * Portions Copyright 2004-2005 Pierangelo Masarati.
 * Portions Copyright 2008 Emmanuel Dreyfus.
 * 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 Pierangelo Masarati
 * for SysNet s.n.c., for inclusion in OpenLDAP Software.
 */

#include "portable.h"

#ifdef SLAPD_OVER_DYNLIST

#if LDAP_VENDOR_VERSION_MINOR == X || LDAP_VENDOR_VERSION_MINOR > 3
#if SLAPD_OVER_DYNGROUP != SLAPD_MOD_STATIC
#define TAKEOVER_DYNGROUP
#endif
#else
#if LDAP_VENDOR_VERSION_MINOR < 3
#define OL_2_2_COMPAT
#endif
#endif

#include <stdio.h>

#include <ac/string.h>

#include "slap.h"
#ifndef OL_2_2_COMPAT
#include "config.h"
#endif
#include "lutil.h"

/* FIXME: the code differs if SLAP_OPATTRS is defined or not;
 * SLAP_OPATTRS is not defined in 2.2 yet, while this overlay
 * expects HEAD code at least later than August 6, 2004. */
/* FIXME: slap_anlist_no_attrs was introduced in 2.3; here it
 * is anticipated to allow using this overlay with 2.2. */

#ifdef OL_2_2_COMPAT
static AttributeName anlist_no_attrs[] = {
      { BER_BVC( LDAP_NO_ATTRS ), NULL, 0, NULL },
      { BER_BVNULL, NULL, 0, NULL }
};

static AttributeName *slap_anlist_no_attrs = anlist_no_attrs;
#endif

static AttributeDescription *ad_dgIdentity, *ad_dgAuthz;

typedef struct dynlist_map_t {
      AttributeDescription *dlm_member_ad;
      AttributeDescription *dlm_mapped_ad;
      struct dynlist_map_t *dlm_next;
} dynlist_map_t;

typedef struct dynlist_info_t {
      ObjectClass       *dli_oc;
      AttributeDescription    *dli_ad;
      struct dynlist_map_t    *dli_dlm;
      struct berval           dli_default_filter;
      struct dynlist_info_t   *dli_next;
} dynlist_info_t;

#define DYNLIST_USAGE \
      "\"dynlist-attrset <oc> <URL-ad> [[<mapped-ad>:]<member-ad> ...]\": "

static dynlist_info_t *
dynlist_is_dynlist_next( Operation *op, SlapReply *rs, dynlist_info_t *old_dli )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      dynlist_info_t    *dli;

      Attribute   *a;

      if ( old_dli == NULL ) {
            dli = (dynlist_info_t *)on->on_bi.bi_private;

      } else {
            dli = old_dli->dli_next;
      }

      a = attrs_find( rs->sr_entry->e_attrs, slap_schema.si_ad_objectClass );
      if ( a == NULL ) {
            /* FIXME: objectClass must be present; for non-storage
             * backends, like back-ldap, it needs to be added
             * to the requested attributes */
            return NULL;
      }

      for ( ; dli; dli = dli->dli_next ) {
            if ( attr_valfind( a,
                        SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
                        SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
                        &dli->dli_oc->soc_cname, NULL,
                        op->o_tmpmemctx ) == 0 )
            {
                  return dli;
            }
      }

      return NULL;
}

static int
dynlist_make_filter( Operation *op, struct berval *oldf, struct berval *newf )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      dynlist_info_t    *dli = (dynlist_info_t *)on->on_bi.bi_private;

      char        *ptr;

      assert( oldf != NULL );
      assert( newf != NULL );
      assert( !BER_BVISNULL( oldf ) );
      assert( !BER_BVISEMPTY( oldf ) );

      newf->bv_len = STRLENOF( "(&(!(objectClass=" "))" ")" )
            + dli->dli_oc->soc_cname.bv_len + oldf->bv_len;
      newf->bv_val = op->o_tmpalloc( newf->bv_len + 1, op->o_tmpmemctx );
      if ( newf->bv_val == NULL ) {
            return -1;
      }
      ptr = lutil_strcopy( newf->bv_val, "(&(!(objectClass=" );
      ptr = lutil_strcopy( ptr, dli->dli_oc->soc_cname.bv_val );
      ptr = lutil_strcopy( ptr, "))" );
      ptr = lutil_strcopy( ptr, oldf->bv_val );
      ptr = lutil_strcopy( ptr, ")" );
      newf->bv_len = ptr - newf->bv_val;

      return 0;
}

typedef struct dynlist_sc_t {
      dynlist_info_t    *dlc_dli;
      Entry       *dlc_e;
} dynlist_sc_t;

static int
dynlist_sc_update( Operation *op, SlapReply *rs )
{
      Entry             *e;
      Attribute         *a;
      int               opattrs,
                        userattrs;
      AccessControlState      acl_state = ACL_STATE_INIT;

      dynlist_sc_t            *dlc;
      dynlist_map_t           *dlm;

      if ( rs->sr_type != REP_SEARCH ) {
            return 0;
      }

      dlc = (dynlist_sc_t *)op->o_callback->sc_private;
      e = dlc->dlc_e;

      assert( e != NULL );
      assert( rs->sr_entry != NULL );

      /* test access to entry */
      if ( !access_allowed( op, rs->sr_entry, slap_schema.si_ad_entry,
                        NULL, ACL_READ, NULL ) )
      {
            goto done;
      }

      for ( dlm = dlc->dlc_dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
            if (dlm->dlm_mapped_ad != NULL)
                  continue;

            /* if access allowed, try to add values, emulating permissive
             * control to silently ignore duplicates */
            if ( access_allowed( op, rs->sr_entry, slap_schema.si_ad_entry,
                              NULL, ACL_READ, NULL ) )
            {
                  Modification      mod;
                  const char  *text = NULL;
                  char        textbuf[1024];
                  struct berval     vals[ 2 ], nvals[ 2 ];

                  vals[ 0 ] = rs->sr_entry->e_name;
                  BER_BVZERO( &vals[ 1 ] );
                  nvals[ 0 ] = rs->sr_entry->e_nname;
                  BER_BVZERO( &nvals[ 1 ] );

                  mod.sm_op = LDAP_MOD_ADD;
                  mod.sm_desc = dlm->dlm_member_ad;
                  mod.sm_type = dlm->dlm_member_ad->ad_cname;
                  mod.sm_values = vals;
                  mod.sm_nvalues = nvals;
                  mod.sm_numvals = 1;

                  (void)modify_add_values( e, &mod, /* permissive */ 1,
                              &text, textbuf, sizeof( textbuf ) );
            }

            goto done;
      }

#ifndef SLAP_OPATTRS
      opattrs = ( rs->sr_attrs == NULL ) ? 0 : an_find( rs->sr_attrs, &AllOper );
      userattrs = ( rs->sr_attrs == NULL ) ? 1 : an_find( rs->sr_attrs, &AllUser );
#else /* SLAP_OPATTRS */
      opattrs = SLAP_OPATTRS( rs->sr_attr_flags );
      userattrs = SLAP_USERATTRS( rs->sr_attr_flags );
#endif /* SLAP_OPATTRS */

      for ( a = rs->sr_entry->e_attrs; a != NULL; a = a->a_next ) {
            BerVarray   vals, nvals = NULL;
            int         i, j,
                        is_oc = a->a_desc == slap_schema.si_ad_objectClass;

            /* if attribute is not requested, skip it */
            if ( rs->sr_attrs == NULL ) {
                  if ( is_at_operational( a->a_desc->ad_type ) ) {
                        continue;
                  }

            } else {
                  if ( is_at_operational( a->a_desc->ad_type ) ) {
                        if ( !opattrs && !ad_inlist( a->a_desc, rs->sr_attrs ) )
                        {
                              continue;
                        }

                  } else {
                        if ( !userattrs && !ad_inlist( a->a_desc, rs->sr_attrs ) )
                        {
                              continue;
                        }
                  }
            }

            /* test access to attribute */
            if ( op->ors_attrsonly ) {
                  if ( !access_allowed( op, rs->sr_entry, a->a_desc, NULL,
                                    ACL_READ, &acl_state ) )
                  {
                        continue;
                  }
            }

            /* single-value check: keep first only */
            if ( is_at_single_value( a->a_desc->ad_type ) ) {
                  if ( attr_find( e->e_attrs, a->a_desc ) != NULL ) {
                        continue;
                  }
            }

            /* test access to attribute */
            i = a->a_numvals;

            vals = op->o_tmpalloc( ( i + 1 ) * sizeof( struct berval ), op->o_tmpmemctx );
            if ( a->a_nvals != a->a_vals ) {
                  nvals = op->o_tmpalloc( ( i + 1 ) * sizeof( struct berval ), op->o_tmpmemctx );
            }

            for ( i = 0, j = 0; !BER_BVISNULL( &a->a_vals[i] ); i++ ) {
                  if ( is_oc ) {
                        ObjectClass *soc = oc_bvfind( &a->a_vals[i] );

                        if ( soc->soc_kind == LDAP_SCHEMA_STRUCTURAL ) {
                              continue;
                        }
                  }

                  if ( access_allowed( op, rs->sr_entry, a->a_desc,
                                    &a->a_nvals[i], ACL_READ, &acl_state ) )
                  {
                        vals[j] = a->a_vals[i];
                        if ( nvals ) {
                              nvals[j] = a->a_nvals[i];
                        }
                        j++;
                  }
            }

            /* if access allowed, try to add values, emulating permissive
             * control to silently ignore duplicates */
            if ( j != 0 ) {
                  Modification      mod;
                  const char  *text = NULL;
                  char        textbuf[1024];
                  dynlist_map_t     *dlm;
                  AttributeDescription *ad;

                  BER_BVZERO( &vals[j] );
                  if ( nvals ) {
                        BER_BVZERO( &nvals[j] );
                  }

                  ad = a->a_desc;
                  for ( dlm = dlc->dlc_dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
                        if ( dlm->dlm_member_ad == a->a_desc ) {
                              ad = dlm->dlm_mapped_ad;
                              break;
                        }
                  }

                  mod.sm_op = LDAP_MOD_ADD;
                  mod.sm_desc = ad;
                  mod.sm_type = ad->ad_cname;
                  mod.sm_values = vals;
                  mod.sm_nvalues = nvals;
                  mod.sm_numvals = j;

                  (void)modify_add_values( e, &mod, /* permissive */ 1,
                              &text, textbuf, sizeof( textbuf ) );
            }

            op->o_tmpfree( vals, op->o_tmpmemctx );
            if ( nvals ) {
                  op->o_tmpfree( nvals, op->o_tmpmemctx );
            }
      }

done:;
      if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
            entry_free( rs->sr_entry );
            rs->sr_entry = NULL;
            rs->sr_flags ^= REP_ENTRY_MUSTBEFREED;
      }

      return 0;
}
      
static int
dynlist_prepare_entry( Operation *op, SlapReply *rs, dynlist_info_t *dli )
{
      Attribute   *a, *id = NULL;
      slap_callback     cb;
      Operation   o = *op;
      SlapReply   r = { REP_SEARCH };
      struct berval     *url;
      Entry       *e;
      slap_mask_t e_flags;
      int         opattrs,
                  userattrs;
      dynlist_sc_t      dlc = { 0 };
      dynlist_map_t     *dlm;

      a = attrs_find( rs->sr_entry->e_attrs, dli->dli_ad );
      if ( a == NULL ) {
            /* FIXME: error? */
            return SLAP_CB_CONTINUE;
      }

#ifndef SLAP_OPATTRS
      opattrs = ( rs->sr_attrs == NULL ) ? 0 : an_find( rs->sr_attrs, &AllOper );
      userattrs = ( rs->sr_attrs == NULL ) ? 1 : an_find( rs->sr_attrs, &AllUser );
#else /* SLAP_OPATTRS */
      opattrs = SLAP_OPATTRS( rs->sr_attr_flags );
      userattrs = SLAP_USERATTRS( rs->sr_attr_flags );
#endif /* SLAP_OPATTRS */

      /* Don't generate member list if it wasn't requested */
      for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
            if ( userattrs ||
                 ad_inlist( dlm->dlm_member_ad, rs->sr_attrs ) ) 
                  break;
      }
      if ( dli->dli_dlm && !dlm )
            return SLAP_CB_CONTINUE;

      if ( ad_dgIdentity && ( id = attrs_find( rs->sr_entry->e_attrs, ad_dgIdentity ))) {
            Attribute *authz = NULL;

            /* if not rootdn and dgAuthz is present,
             * check if user can be authorized as dgIdentity */
            if ( ad_dgAuthz && !BER_BVISEMPTY( &id->a_nvals[0] ) && !be_isroot( op )
                  && ( authz = attrs_find( rs->sr_entry->e_attrs, ad_dgAuthz ) ) )
            {
                  if ( slap_sasl_matches( op, authz->a_nvals,
                        &o.o_ndn, &o.o_ndn ) != LDAP_SUCCESS )
                  {
                        return SLAP_CB_CONTINUE;
                  }
            }

            o.o_dn = id->a_vals[0];
            o.o_ndn = id->a_nvals[0];
            o.o_groups = NULL;
      }

      if ( !( rs->sr_flags & REP_ENTRY_MODIFIABLE ) ) {
            e = entry_dup( rs->sr_entry );
      } else {
            e = rs->sr_entry;
      }
      e_flags = rs->sr_flags | ( REP_ENTRY_MODIFIABLE | REP_ENTRY_MUSTBEFREED );

      dlc.dlc_e = e;
      dlc.dlc_dli = dli;
      cb.sc_private = &dlc;
      cb.sc_response = dynlist_sc_update;
      cb.sc_cleanup = NULL;
      cb.sc_next = NULL;

      o.o_callback = &cb;
      o.ors_deref = LDAP_DEREF_NEVER;
      o.ors_limit = NULL;
      o.ors_tlimit = SLAP_NO_LIMIT;
      o.ors_slimit = SLAP_NO_LIMIT;

      for ( url = a->a_nvals; !BER_BVISNULL( url ); url++ ) {
            LDAPURLDesc *lud = NULL;
            int         i, j;
            struct berval     dn;
            int         rc;
            dynlist_map_t     *dlm;

            BER_BVZERO( &o.o_req_dn );
            BER_BVZERO( &o.o_req_ndn );
            o.ors_filter = NULL;
            o.ors_attrs = NULL;
            BER_BVZERO( &o.ors_filterstr );

            if ( ldap_url_parse( url->bv_val, &lud ) != LDAP_URL_SUCCESS ) {
                  /* FIXME: error? */
                  continue;
            }

            if ( lud->lud_host != NULL ) {
                  /* FIXME: host not allowed; reject as illegal? */
                  Debug( LDAP_DEBUG_ANY, "dynlist_prepare_entry(\"%s\"): "
                        "illegal URI \"%s\"\n",
                        e->e_name.bv_val, url->bv_val, 0 );
                  goto cleanup;
            }

            if ( lud->lud_dn == NULL ) {
                  /* note that an empty base is not honored in terms
                   * of defaultSearchBase, because select_backend()
                   * is not aware of the defaultSearchBase option;
                   * this can be useful in case of a database serving
                   * the empty suffix */
                  BER_BVSTR( &dn, "" );

            } else {
                  ber_str2bv( lud->lud_dn, 0, 0, &dn );
            }
            rc = dnPrettyNormal( NULL, &dn, &o.o_req_dn, &o.o_req_ndn, op->o_tmpmemctx );
            if ( rc != LDAP_SUCCESS ) {
                  /* FIXME: error? */
                  goto cleanup;
            }
            o.ors_scope = lud->lud_scope;

            for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
                  if ( dlm->dlm_mapped_ad != NULL ) {
                        break;
                  }
            }

            if ( dli->dli_dlm && !dlm ) {
                  /* if ( lud->lud_attrs != NULL ),
                   * the URL should be ignored */
                  o.ors_attrs = slap_anlist_no_attrs;

            } else if ( lud->lud_attrs == NULL ) {
                  o.ors_attrs = rs->sr_attrs;

            } else {
                  for ( i = 0; lud->lud_attrs[i]; i++)
                        /* just count */ ;

                  o.ors_attrs = op->o_tmpcalloc( i + 1, sizeof( AttributeName ), op->o_tmpmemctx );
                  for ( i = 0, j = 0; lud->lud_attrs[i]; i++) {
                        const char  *text = NULL;
      
                        ber_str2bv( lud->lud_attrs[i], 0, 0, &o.ors_attrs[j].an_name );
                        o.ors_attrs[j].an_desc = NULL;
                        (void)slap_bv2ad( &o.ors_attrs[j].an_name, &o.ors_attrs[j].an_desc, &text );
                        /* FIXME: ignore errors... */

                        if ( rs->sr_attrs == NULL ) {
                              if ( o.ors_attrs[j].an_desc != NULL &&
                                          is_at_operational( o.ors_attrs[j].an_desc->ad_type ) )
                              {
                                    continue;
                              }

                        } else {
                              if ( o.ors_attrs[j].an_desc != NULL &&
                                          is_at_operational( o.ors_attrs[j].an_desc->ad_type ) )
                              {
                                    if ( !opattrs && !ad_inlist( o.ors_attrs[j].an_desc, rs->sr_attrs ) )
                                    {
                                          continue;
                                    }

                              } else {
                                    if ( !userattrs && 
                                                o.ors_attrs[j].an_desc != NULL &&
                                                !ad_inlist( o.ors_attrs[j].an_desc, rs->sr_attrs ) )
                                    {
                                          continue;
                                    }
                              }
                        }

                        j++;
                  }

                  if ( j == 0 ) {
                        goto cleanup;
                  }
            
                  BER_BVZERO( &o.ors_attrs[j].an_name );
            }

            if ( lud->lud_filter == NULL ) {
                  ber_dupbv_x( &o.ors_filterstr,
                              &dli->dli_default_filter, op->o_tmpmemctx );

            } else {
                  struct berval     flt;
                  ber_str2bv( lud->lud_filter, 0, 0, &flt );
                  if ( dynlist_make_filter( op, &flt, &o.ors_filterstr ) ) {
                        /* error */
                        goto cleanup;
                  }
            }
            o.ors_filter = str2filter_x( op, o.ors_filterstr.bv_val );
            if ( o.ors_filter == NULL ) {
                  goto cleanup;
            }
            
            o.o_bd = select_backend( &o.o_req_ndn, 1 );
            if ( o.o_bd && o.o_bd->be_search ) {
#ifdef SLAP_OPATTRS
                  r.sr_attr_flags = slap_attr_flags( o.ors_attrs );
#endif /* SLAP_OPATTRS */
                  (void)o.o_bd->be_search( &o, &r );
            }

cleanup:;
            if ( id ) {
                  slap_op_groups_free( &o );
            }
            if ( o.ors_filter ) {
                  filter_free_x( &o, o.ors_filter );
            }
            if ( o.ors_attrs && o.ors_attrs != rs->sr_attrs
                        && o.ors_attrs != slap_anlist_no_attrs )
            {
                  op->o_tmpfree( o.ors_attrs, op->o_tmpmemctx );
            }
            if ( !BER_BVISNULL( &o.o_req_dn ) ) {
                  op->o_tmpfree( o.o_req_dn.bv_val, op->o_tmpmemctx );
            }
            if ( !BER_BVISNULL( &o.o_req_ndn ) ) {
                  op->o_tmpfree( o.o_req_ndn.bv_val, op->o_tmpmemctx );
            }
            assert( BER_BVISNULL( &o.ors_filterstr )
                  || o.ors_filterstr.bv_val != lud->lud_filter );
            op->o_tmpfree( o.ors_filterstr.bv_val, op->o_tmpmemctx );
            ldap_free_urldesc( lud );
      }

      rs->sr_entry = e;
      rs->sr_flags = e_flags;

      return SLAP_CB_CONTINUE;
}

static int
dynlist_sc_save_entry( Operation *op, SlapReply *rs )
{
      /* save the entry in the private field of the callback,
       * so it doesn't get freed (it's temporary!) */
      if ( rs->sr_entry != NULL ) {
            dynlist_sc_t      *dlc = (dynlist_sc_t *)op->o_callback->sc_private;
            dlc->dlc_e = rs->sr_entry;
            rs->sr_entry = NULL;
      }

      return 0;
}

static int
dynlist_compare( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      dynlist_info_t    *dli = (dynlist_info_t *)on->on_bi.bi_private;
      Operation o = *op;
      Entry *e = NULL;
      dynlist_map_t *dlm;

      for ( ; dli != NULL; dli = dli->dli_next ) {
            for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next )
                  if ( op->oq_compare.rs_ava->aa_desc == dlm->dlm_member_ad )
                        break;

            if ( dli->dli_dlm && dlm ) {
                  /* This compare is for one of the attributes we're
                   * interested in. We'll use slapd's existing dyngroup
                   * evaluator to get the answer we want.
                   */
                  BerVarray id = NULL, authz = NULL;

                  o.o_do_not_cache = 1;

                  if ( ad_dgIdentity && backend_attribute( &o, NULL, &o.o_req_ndn,
                        ad_dgIdentity, &id, ACL_READ ) == LDAP_SUCCESS )
                  {
                        /* if not rootdn and dgAuthz is present,
                         * check if user can be authorized as dgIdentity */
                        if ( ad_dgAuthz && !BER_BVISEMPTY( id ) && !be_isroot( op )
                              && backend_attribute( &o, NULL, &o.o_req_ndn,
                                    ad_dgAuthz, &authz, ACL_READ ) == LDAP_SUCCESS )
                        {
                              
                              rs->sr_err = slap_sasl_matches( op, authz,
                                    &o.o_ndn, &o.o_ndn );
                              ber_bvarray_free_x( authz, op->o_tmpmemctx );
                              if ( rs->sr_err != LDAP_SUCCESS ) {
                                    goto done;
                              }
                        }

                        o.o_dn = *id;
                        o.o_ndn = *id;
                        o.o_groups = NULL; /* authz changed, invalidate cached groups */
                  }

                  rs->sr_err = backend_group( &o, NULL, &o.o_req_ndn,
                        &o.oq_compare.rs_ava->aa_value, dli->dli_oc, dli->dli_ad );
                  switch ( rs->sr_err ) {
                  case LDAP_SUCCESS:
                        rs->sr_err = LDAP_COMPARE_TRUE;
                        break;

                  case LDAP_NO_SUCH_OBJECT:
                        /* NOTE: backend_group() returns noSuchObject
                         * if op_ndn does not exist; however, since
                         * dynamic list expansion means that the
                         * member attribute is virtually present, the
                         * non-existence of the asserted value implies
                         * the assertion is FALSE rather than
                         * UNDEFINED */
                        rs->sr_err = LDAP_COMPARE_FALSE;
                        break;
                  }

done:;
                  if ( id ) ber_bvarray_free_x( id, o.o_tmpmemctx );

                  return SLAP_CB_CONTINUE;
            }
      }

      if ( overlay_entry_get_ov( &o, &o.o_req_ndn, NULL, NULL, 0, &e, on ) !=
            LDAP_SUCCESS || e == NULL )
      {
            return SLAP_CB_CONTINUE;
      }

      if ( ad_dgIdentity ) {
            Attribute *id = attrs_find( e->e_attrs, ad_dgIdentity );
            if ( id ) {
                  Attribute *authz;

                  /* if not rootdn and dgAuthz is present,
                   * check if user can be authorized as dgIdentity */
                  if ( ad_dgAuthz && !BER_BVISEMPTY( &id->a_nvals[0] ) && !be_isroot( op )
                        && ( authz = attrs_find( e->e_attrs, ad_dgAuthz ) ) )
                  {
                        if ( slap_sasl_matches( op, authz->a_nvals,
                              &o.o_ndn, &o.o_ndn ) != LDAP_SUCCESS )
                        {
                              goto release;
                        }
                  }

                  o.o_dn = id->a_vals[0];
                  o.o_ndn = id->a_nvals[0];
                  o.o_groups = NULL;
            }
      }

      dli = (dynlist_info_t *)on->on_bi.bi_private;
      for ( ; dli != NULL && rs->sr_err != LDAP_COMPARE_TRUE; dli = dli->dli_next ) {
            Attribute   *a;
            slap_callback     cb;
            SlapReply   r = { REP_SEARCH };
            AttributeName     an[2];
            int         rc;
            dynlist_sc_t      dlc = { 0 };

            if ( !is_entry_objectclass_or_sub( e, dli->dli_oc ))
                  continue;

            /* if the entry has the right objectClass, generate
             * the dynamic list and compare */
            dlc.dlc_dli = dli;
            cb.sc_private = &dlc;
            cb.sc_response = dynlist_sc_save_entry;
            cb.sc_cleanup = NULL;
            cb.sc_next = NULL;
            o.o_callback = &cb;

            o.o_tag = LDAP_REQ_SEARCH;
            o.ors_limit = NULL;
            o.ors_tlimit = SLAP_NO_LIMIT;
            o.ors_slimit = SLAP_NO_LIMIT;

            o.o_bd = select_backend( &o.o_req_ndn, 1 );
            if ( !o.o_bd || !o.o_bd->be_search ) {
                  goto release;
            }

            o.ors_filterstr = *slap_filterstr_objectClass_pres;
            o.ors_filter = (Filter *) slap_filter_objectClass_pres;

            o.ors_scope = LDAP_SCOPE_BASE;
            o.ors_deref = LDAP_DEREF_NEVER;
            an[0].an_name = op->orc_ava->aa_desc->ad_cname;
            an[0].an_desc = op->orc_ava->aa_desc;
            BER_BVZERO( &an[1].an_name );
            o.ors_attrs = an;
            o.ors_attrsonly = 0;

            o.o_acl_priv = ACL_COMPARE;

            rc = o.o_bd->be_search( &o, &r );

            if ( o.o_dn.bv_val != op->o_dn.bv_val ) {
                  slap_op_groups_free( &o );
            }

            if ( rc != 0 ) {
                  goto release;
            }

            if ( dlc.dlc_e != NULL ) {
                  r.sr_entry = dlc.dlc_e;
            }

            if ( r.sr_err != LDAP_SUCCESS || r.sr_entry == NULL ) {
                  /* error? */
                  goto release;
            }

            for ( a = attrs_find( r.sr_entry->e_attrs, op->orc_ava->aa_desc );
                  a != NULL;
                  a = attrs_find( a->a_next, op->orc_ava->aa_desc ) )
            {
                  /* if we're here, we got a match... */
                  rs->sr_err = LDAP_COMPARE_FALSE;

                  if ( attr_valfind( a,
                        SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
                              SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
                        &op->orc_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
                  {
                        rs->sr_err = LDAP_COMPARE_TRUE;
                        break;
                  }
            }

            if ( r.sr_flags & REP_ENTRY_MUSTBEFREED ) {
                  entry_free( r.sr_entry );
            }
      }

release:;
      if ( e != NULL ) {
            overlay_entry_release_ov( &o, e, 0, on );
      }

      return SLAP_CB_CONTINUE;
}

static int
dynlist_response( Operation *op, SlapReply *rs )
{
      dynlist_info_t    *dli;

      switch ( op->o_tag ) {
      case LDAP_REQ_SEARCH:
            if ( rs->sr_type == REP_SEARCH && !get_manageDSAit( op ) )
            {
                  int   rc = LDAP_OTHER;

                  for ( dli = dynlist_is_dynlist_next( op, rs, NULL );
                        dli;
                        dli = dynlist_is_dynlist_next( op, rs, dli ) )
                  {
                        rc = dynlist_prepare_entry( op, rs, dli );
                  }

                  if ( rc != LDAP_OTHER ) {
                        return rc;
                  }
            }
            break;

      case LDAP_REQ_COMPARE:
            switch ( rs->sr_err ) {
            /* NOTE: we waste a few cycles running the dynamic list
             * also when the result is FALSE, which occurs if the
             * dynamic entry itself contains the AVA attribute  */
            /* FIXME: this approach is less than optimal; a dedicated
             * compare op should be implemented, that fetches the
             * entry, checks if it has the appropriate objectClass
             * and, in case, runs a compare thru all the URIs,
             * stopping at the first positive occurrence; see ITS#3756 */
            case LDAP_COMPARE_FALSE:
            case LDAP_NO_SUCH_ATTRIBUTE:
                  return dynlist_compare( op, rs );
            }
            break;

      default:
            break;
      }

      return SLAP_CB_CONTINUE;
}

static int
dynlist_build_def_filter( dynlist_info_t *dli )
{
      char  *ptr;

      dli->dli_default_filter.bv_len = STRLENOF( "(!(objectClass=" "))" )
            + dli->dli_oc->soc_cname.bv_len;
      dli->dli_default_filter.bv_val = ch_malloc( dli->dli_default_filter.bv_len + 1 );
      if ( dli->dli_default_filter.bv_val == NULL ) {
            Debug( LDAP_DEBUG_ANY, "dynlist_db_open: malloc failed.\n",
                  0, 0, 0 );
            return -1;
      }

      ptr = lutil_strcopy( dli->dli_default_filter.bv_val, "(!(objectClass=" );
      ptr = lutil_strcopy( ptr, dli->dli_oc->soc_cname.bv_val );
      ptr = lutil_strcopy( ptr, "))" );

      assert( dli->dli_default_filter.bv_len == ptr - dli->dli_default_filter.bv_val );

      return 0;
}

#ifdef OL_2_2_COMPAT
static int
dynlist_db_config(
      BackendDB   *be,
      const char  *fname,
      int         lineno,
      int         argc,
      char        **argv )
{
      slap_overinst     *on = (slap_overinst *)be->bd_info;

      int         rc = 0;

      if ( strcasecmp( argv[0], "dynlist-attrset" ) == 0 ) {
            dynlist_info_t          **dlip;
            ObjectClass       *oc;
            AttributeDescription    *ad = NULL,
                              *member_ad = NULL;
            dynlist_map_t           *dlm = NULL;
            const char        *text;

            if ( argc < 3 ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: " DYNLIST_USAGE
                        "invalid arg number #%d.\n",
                        fname, lineno, argc );
                  return 1;
            }

            oc = oc_find( argv[1] );
            if ( oc == NULL ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: " DYNLIST_USAGE
                        "unable to find ObjectClass \"%s\"\n",
                        fname, lineno, argv[ 1 ] );
                  return 1;
            }

            rc = slap_str2ad( argv[2], &ad, &text );
            if ( rc != LDAP_SUCCESS ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: " DYNLIST_USAGE
                        "unable to find AttributeDescription \"%s\"\n",
                        fname, lineno, argv[2] );
                  return 1;
            }

            if ( !is_at_subtype( ad->ad_type, slap_schema.si_ad_labeledURI->ad_type ) ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: " DYNLIST_USAGE
                        "AttributeDescription \"%s\" "
                        "must be a subtype of \"labeledURI\"\n",
                        fname, lineno, argv[2] );
                  return 1;
            }

            for ( i = 3; i < argc; i++ ) {
                  char *arg; 
                  char *cp;
                  AttributeDescription *member_ad = NULL;
                  AttributeDescription *mapped_ad = NULL;
                  dynlist_map_t *dlmp;
                  dynlist_map_t *dlml;


                  /*
                   * If no mapped attribute is given, dn is used 
                   * for backward compatibility.
                   */
                  arg = argv[i];
                  if ( cp = strchr( arg, (int)':' ) != NULL ) {
                        struct berval bv;
                        ber_str2bv( arg, cp - arg, 0, &bv );
                        rc = slap_bv2ad( &bv, &mapped_ad, &text );
                        if ( rc != LDAP_SUCCESS ) {
                              Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                                    DYNLIST_USAGE
                                    "unable to find mapped AttributeDescription \"%s\"\n",
                                    fname, lineno, arg );
                              return 1;
                        }
                        
                        arg = cp + 1;
                  }

                  rc = slap_str2ad( arg, &member_ad, &text );
                  if ( rc != LDAP_SUCCESS ) {
                        Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                              DYNLIST_USAGE
                              "unable to find AttributeDescription \"%s\"\n",
                              fname, lineno, arg );
                        return 1;
                  }

                  dlmp = (dynlist_map_t *)ch_calloc( 1, sizeof( dynlist_map_t ) );
                  if ( dlm == NULL ) {
                        dlm = dlmp;
                        dlml = NULL;
                  }
                  dlmp->dlm_member_ad = member_ad;
                  dlmp->dlm_mapped_ad = mapped_ad;
                  dlmp->dlm_next = NULL;
            
                  if ( dlml != NULL )
                        dlml->dlm_next = dlmp;
                  dlml = dlmp;
            }

            for ( dlip = (dynlist_info_t **)&on->on_bi.bi_private;
                  *dlip; dlip = &(*dlip)->dli_next )
            {
                  /* 
                   * The same URL attribute / member attribute pair
                   * cannot be repeated, but we enforce this only 
                   * when the member attribute is unique. Performing
                   * the check for multiple values would require
                   * sorting and comparing the lists, which is left
                   * as a future improvement
                   */
                  if ( (*dlip)->dli_ad == ad &&
                       (*dlip)->dli_dlm->dlm_next == NULL &&
                       dlm->dlm_next == NULL &&
                       dlm->dlm_member_ad == (*dlip)->dli_dlm->dlm_member_ad &&
                       dlm->dlm_mapped_ad == (*dlip)->dli_dlm->dlm_mapped_ad ) {
                        Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                              DYNLIST_USAGE
                              "URL attributeDescription \"%s\" already mapped.\n",
                              fname, lineno, ad->ad_cname.bv_val );
#if 0
                        /* make it a warning... */
                        return 1;
#endif
                  }
            }

            *dlip = (dynlist_info_t *)ch_calloc( 1, sizeof( dynlist_info_t ) );
            (*dlip)->dli_oc = oc;
            (*dlip)->dli_ad = ad;
            (*dlip)->dli_dlm = dlm;

            if ( dynlist_build_def_filter( *dlip ) ) {
                  dynlist_map_t *dlm = (*dlip)->ldi_dlm;
                  dynlist_map_t *dlm_next;

                  while ( dlm != NULL ) {
                        dlm_next = dlm->dlm_next;
                        ch_free( dlm );
                        dlm = dlm_next;
                  }

                  ch_free( *dlip );
                  *dlip = NULL;
                  return 1;
            }

      /* allow dyngroup syntax */
      } else if ( strcasecmp( argv[0], "dynlist-attrpair" ) == 0 ) {
            dynlist_info_t          **dlip;
            ObjectClass       *oc;
            AttributeDescription    *ad = NULL,
                              *member_ad = NULL;
            const char        *text;

            if ( argc != 3 ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "invalid arg number #%d.\n",
                        fname, lineno, argc );
                  return 1;
            }

            oc = oc_find( "groupOfURLs" );
            if ( oc == NULL ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "unable to find default ObjectClass \"groupOfURLs\"\n",
                        fname, lineno, 0 );
                  return 1;
            }

            rc = slap_str2ad( argv[1], &member_ad, &text );
            if ( rc != LDAP_SUCCESS ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "unable to find AttributeDescription \"%s\"\n",
                        fname, lineno, argv[1] );
                  return 1;
            }

            rc = slap_str2ad( argv[2], &ad, &text );
            if ( rc != LDAP_SUCCESS ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "unable to find AttributeDescription \"%s\"\n",
                        fname, lineno, argv[2] );
                  return 1;
            }

            if ( !is_at_subtype( ad->ad_type, slap_schema.si_ad_labeledURI->ad_type ) ) {
                  Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "AttributeDescription \"%s\" "
                        "must be a subtype of \"labeledURI\"\n",
                        fname, lineno, argv[2] );
                  return 1;
            }

            for ( dlip = (dynlist_info_t **)&on->on_bi.bi_private;
                  *dlip; dlip = &(*dlip)->dli_next )
            {
                  /* 
                   * The same URL attribute / member attribute pair
                   * cannot be repeated, but we enforce this only 
                   * when the member attribute is unique. Performing
                   * the check for multiple values would require
                   * sorting and comparing the lists, which is left
                   * as a future improvement
                   */
                  if ( (*dlip)->dli_ad == ad &&
                       (*dlip)->dli_dlm->dlm_next == NULL &&
                       member_ad == (*dlip)->dli_dlm->dlm_member_ad ) {
                        Debug( LDAP_DEBUG_ANY, "%s: line %d: "
                              "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                              "URL attributeDescription \"%s\" already mapped.\n",
                              fname, lineno, ad->ad_cname.bv_val );
#if 0
                        /* make it a warning... */
                        return 1;
#endif
                  }
            }

            *dlip = (dynlist_info_t *)ch_calloc( 1, sizeof( dynlist_info_t ) );
            (*dlip)->dli_oc = oc;
            (*dlip)->dli_ad = ad;
            (*dlip)->dli_dlm = (dynlist_map_t *)ch_calloc( 1, sizeof( dynlist_map_t ) );
            (*dlip)->dli_dlm->dlm_member_ad = member_ad;
            (*dlip)->dli_dlm->dlm_mapped_ad = NULL;

            if ( dynlist_build_def_filter( *dlip ) ) {
                  ch_free( (*dlip)->dli_dlm );
                  ch_free( *dlip );
                  *dlip = NULL;
                  return 1;
            }

      } else {
            rc = SLAP_CONF_UNKNOWN;
      }

      return rc;
}

#else
enum {
      DL_ATTRSET = 1,
      DL_ATTRPAIR,
      DL_ATTRPAIR_COMPAT,
      DL_LAST
};

static ConfigDriver     dl_cfgen;

/* XXXmanu 255 is the maximum arguments we allow. Can we go beyond? */
static ConfigTable dlcfg[] = {
      { "dynlist-attrset", "group-oc> <URL-ad> <member-ad",
            3, 255, 0, ARG_MAGIC|DL_ATTRSET, dl_cfgen,
            "( OLcfgOvAt:8.1 NAME 'olcDLattrSet' "
                  "DESC 'Dynamic list: <group objectClass>, <URL attributeDescription>, <member attributeDescription>' "
                  "EQUALITY caseIgnoreMatch "
                  "SYNTAX OMsDirectoryString "
                  "X-ORDERED 'VALUES' )",
                  NULL, NULL },
      { "dynlist-attrpair", "member-ad> <URL-ad",
            3, 3, 0, ARG_MAGIC|DL_ATTRPAIR, dl_cfgen,
                  NULL, NULL, NULL },
#ifdef TAKEOVER_DYNGROUP
      { "attrpair", "member-ad> <URL-ad",
            3, 3, 0, ARG_MAGIC|DL_ATTRPAIR_COMPAT, dl_cfgen,
                  NULL, NULL, NULL },
#endif
      { NULL, NULL, 0, 0, 0, ARG_IGNORED }
};

static ConfigOCs dlocs[] = {
      { "( OLcfgOvOc:8.1 "
            "NAME 'olcDynamicList' "
            "DESC 'Dynamic list configuration' "
            "SUP olcOverlayConfig "
            "MAY olcDLattrSet )",
            Cft_Overlay, dlcfg, NULL, NULL },
      { NULL, 0, NULL }
};

static int
dl_cfgen( ConfigArgs *c )
{
      slap_overinst     *on = (slap_overinst *)c->bi;
      dynlist_info_t    *dli = (dynlist_info_t *)on->on_bi.bi_private;

      int         rc = 0, i;

      if ( c->op == SLAP_CONFIG_EMIT ) {
            switch( c->type ) {
            case DL_ATTRSET:
                  for ( i = 0; dli; i++, dli = dli->dli_next ) {
                        struct berval     bv;
                        char        *ptr = c->cr_msg;
                        dynlist_map_t     *dlm;

                        assert( dli->dli_oc != NULL );
                        assert( dli->dli_ad != NULL );

                        ptr += snprintf( c->cr_msg, sizeof( c->cr_msg ),
                              SLAP_X_ORDERED_FMT "%s %s", i,
                              dli->dli_oc->soc_cname.bv_val,
                              dli->dli_ad->ad_cname.bv_val );

                        for ( dlm = dli->dli_dlm; dlm; dlm = dlm->dlm_next ) {
                              ptr[ 0 ] = ' ';
                              ptr++;
                              if ( dlm->dlm_mapped_ad ) {
                                    ptr = lutil_strcopy( ptr, dlm->dlm_mapped_ad->ad_cname.bv_val );
                                    ptr[ 0 ] = ':';
                                    ptr++;
                              }
                                    
                              ptr = lutil_strcopy( ptr, dlm->dlm_member_ad->ad_cname.bv_val );
                        }

                        bv.bv_val = c->cr_msg;
                        bv.bv_len = ptr - bv.bv_val;
                        value_add_one( &c->rvalue_vals, &bv );
                  }
                  break;

            case DL_ATTRPAIR_COMPAT:
            case DL_ATTRPAIR:
                  rc = 1;
                  break;

            default:
                  rc = 1;
                  break;
            }

            return rc;

      } else if ( c->op == LDAP_MOD_DELETE ) {
            switch( c->type ) {
            case DL_ATTRSET:
                  if ( c->valx < 0 ) {
                        dynlist_info_t    *dli_next;

                        for ( dli_next = dli; dli_next; dli = dli_next ) {
                              dynlist_map_t *dlm = dli->dli_dlm;
                              dynlist_map_t *dlm_next;

                              dli_next = dli->dli_next;

                              ch_free( dli->dli_default_filter.bv_val );

                              while ( dlm != NULL ) {
                                    dlm_next = dlm->dlm_next;
                                    ch_free( dlm );
                                    dlm = dlm_next;
                              }
                              ch_free( dli );
                        }

                        on->on_bi.bi_private = NULL;

                  } else {
                        dynlist_info_t    **dlip;
                        dynlist_map_t *dlm;
                        dynlist_map_t *dlm_next;

                        for ( i = 0, dlip = (dynlist_info_t **)&on->on_bi.bi_private;
                              i < c->valx; i++ )
                        {
                              if ( *dlip == NULL ) {
                                    return 1;
                              }
                              dlip = &(*dlip)->dli_next;
                        }

                        dli = *dlip;
                        *dlip = dli->dli_next;
                        ch_free( dli->dli_default_filter.bv_val );

                        dlm = dli->dli_dlm;
                        while ( dlm != NULL ) {
                              dlm_next = dlm->dlm_next;
                              ch_free( dlm );
                              dlm = dlm_next;
                        }
                        ch_free( dli );

                        dli = (dynlist_info_t *)on->on_bi.bi_private;
                  }
                  break;

            case DL_ATTRPAIR_COMPAT:
            case DL_ATTRPAIR:
                  rc = 1;
                  break;

            default:
                  rc = 1;
                  break;
            }

            return rc;
      }

      switch( c->type ) {
      case DL_ATTRSET: {
            dynlist_info_t          **dlip,
                              *dli_next = NULL;
            ObjectClass       *oc = NULL;
            AttributeDescription    *ad = NULL;
            dynlist_map_t           *dlm = NULL;
            const char        *text;

            oc = oc_find( c->argv[ 1 ] );
            if ( oc == NULL ) {
                  snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
                        "unable to find ObjectClass \"%s\"",
                        c->argv[ 1 ] );
                  Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                        c->log, c->cr_msg, 0 );
                  return 1;
            }

            rc = slap_str2ad( c->argv[ 2 ], &ad, &text );
            if ( rc != LDAP_SUCCESS ) {
                  snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
                        "unable to find AttributeDescription \"%s\"",
                        c->argv[ 2 ] );
                  Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                        c->log, c->cr_msg, 0 );
                  return 1;
            }

            if ( !is_at_subtype( ad->ad_type, slap_schema.si_ad_labeledURI->ad_type ) ) {
                  snprintf( c->cr_msg, sizeof( c->cr_msg ), DYNLIST_USAGE
                        "AttributeDescription \"%s\" "
                        "must be a subtype of \"labeledURI\"",
                        c->argv[ 2 ] );
                  Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                        c->log, c->cr_msg, 0 );
                  return 1;
            }

            for ( i = 3; i < c->argc; i++ ) {
                  char *arg; 
                  char *cp;
                  AttributeDescription *member_ad = NULL;
                  AttributeDescription *mapped_ad = NULL;
                  dynlist_map_t *dlmp;
                  dynlist_map_t *dlml;


                  /*
                   * If no mapped attribute is given, dn is used 
                   * for backward compatibility.
                   */
                  arg = c->argv[i];
                  if ( ( cp = strchr( arg, ':' ) ) != NULL ) {
                        struct berval bv;
                        ber_str2bv( arg, cp - arg, 0, &bv );
                        rc = slap_bv2ad( &bv, &mapped_ad, &text );
                        if ( rc != LDAP_SUCCESS ) {
                              snprintf( c->cr_msg, sizeof( c->cr_msg ),
                                    DYNLIST_USAGE
                                    "unable to find mapped AttributeDescription #%d \"%s\"\n",
                                    i - 3, c->argv[ i ] );
                              Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                                    c->log, c->cr_msg, 0 );
                              return 1;
                        }
                        arg = cp + 1;
                  }

                  rc = slap_str2ad( arg, &member_ad, &text );
                  if ( rc != LDAP_SUCCESS ) {
                        snprintf( c->cr_msg, sizeof( c->cr_msg ),
                              DYNLIST_USAGE
                              "unable to find AttributeDescription #%d \"%s\"\n",
                              i - 3, c->argv[ i ] );
                        Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                              c->log, c->cr_msg, 0 );
                        return 1;
                  }

                  dlmp = (dynlist_map_t *)ch_calloc( 1, sizeof( dynlist_map_t ) );
                  if ( dlm == NULL ) {
                        dlm = dlmp;
                        dlml = NULL;
                  }
                  dlmp->dlm_member_ad = member_ad;
                  dlmp->dlm_mapped_ad = mapped_ad;
                  dlmp->dlm_next = NULL;
            
                  if ( dlml != NULL ) 
                        dlml->dlm_next = dlmp;
                  dlml = dlmp;
            }

            if ( c->valx > 0 ) {
                  int   i;

                  for ( i = 0, dlip = (dynlist_info_t **)&on->on_bi.bi_private;
                        i < c->valx; i++ )
                  {
                        if ( *dlip == NULL ) {
                              snprintf( c->cr_msg, sizeof( c->cr_msg ),
                                    DYNLIST_USAGE
                                    "invalid index {%d}\n",
                                    c->valx );
                              Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                                    c->log, c->cr_msg, 0 );
                              return 1;
                        }
                        dlip = &(*dlip)->dli_next;
                  }
                  dli_next = *dlip;

            } else {
                  for ( dlip = (dynlist_info_t **)&on->on_bi.bi_private;
                        *dlip; dlip = &(*dlip)->dli_next )
                        /* goto last */;
            }

            *dlip = (dynlist_info_t *)ch_calloc( 1, sizeof( dynlist_info_t ) );

            (*dlip)->dli_oc = oc;
            (*dlip)->dli_ad = ad;
            (*dlip)->dli_dlm = dlm;
            (*dlip)->dli_next = dli_next;

            rc = dynlist_build_def_filter( *dlip );

            } break;

      case DL_ATTRPAIR_COMPAT:
            snprintf( c->cr_msg, sizeof( c->cr_msg ),
                  "warning: \"attrpair\" only supported for limited "
                  "backward compatibility with overlay \"dyngroup\"" );
            Debug( LDAP_DEBUG_ANY, "%s: %s.\n", c->log, c->cr_msg, 0 );
            /* fallthru */

      case DL_ATTRPAIR: {
            dynlist_info_t          **dlip;
            ObjectClass       *oc = NULL;
            AttributeDescription    *ad = NULL,
                              *member_ad = NULL;
            const char        *text;

            oc = oc_find( "groupOfURLs" );
            if ( oc == NULL ) {
                  snprintf( c->cr_msg, sizeof( c->cr_msg ),
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "unable to find default ObjectClass \"groupOfURLs\"" );
                  Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                        c->log, c->cr_msg, 0 );
                  return 1;
            }

            rc = slap_str2ad( c->argv[ 1 ], &member_ad, &text );
            if ( rc != LDAP_SUCCESS ) {
                  snprintf( c->cr_msg, sizeof( c->cr_msg ),
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "unable to find AttributeDescription \"%s\"",
                        c->argv[ 1 ] );
                  Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                        c->log, c->cr_msg, 0 );
                  return 1;
            }

            rc = slap_str2ad( c->argv[ 2 ], &ad, &text );
            if ( rc != LDAP_SUCCESS ) {
                  snprintf( c->cr_msg, sizeof( c->cr_msg ),
                        "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                        "unable to find AttributeDescription \"%s\"\n",
                        c->argv[ 2 ] );
                  Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                        c->log, c->cr_msg, 0 );
                  return 1;
            }

            if ( !is_at_subtype( ad->ad_type, slap_schema.si_ad_labeledURI->ad_type ) ) {
                  snprintf( c->cr_msg, sizeof( c->cr_msg ),
                        DYNLIST_USAGE
                        "AttributeDescription \"%s\" "
                        "must be a subtype of \"labeledURI\"",
                        c->argv[ 2 ] );
                  Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                        c->log, c->cr_msg, 0 );
                  return 1;
            }

            for ( dlip = (dynlist_info_t **)&on->on_bi.bi_private;
                  *dlip; dlip = &(*dlip)->dli_next )
            {
                  /* 
                   * The same URL attribute / member attribute pair
                   * cannot be repeated, but we enforce this only 
                   * when the member attribute is unique. Performing
                   * the check for multiple values would require
                   * sorting and comparing the lists, which is left
                   * as a future improvement
                   */
                  if ( (*dlip)->dli_ad == ad &&
                       (*dlip)->dli_dlm->dlm_next == NULL &&
                       member_ad == (*dlip)->dli_dlm->dlm_member_ad ) {
                        snprintf( c->cr_msg, sizeof( c->cr_msg ),
                              "\"dynlist-attrpair <member-ad> <URL-ad>\": "
                              "URL attributeDescription \"%s\" already mapped.\n",
                              ad->ad_cname.bv_val );
                        Debug( LDAP_DEBUG_ANY, "%s: %s.\n",
                              c->log, c->cr_msg, 0 );
#if 0
                        /* make it a warning... */
                        return 1;
#endif
                  }
            }

            *dlip = (dynlist_info_t *)ch_calloc( 1, sizeof( dynlist_info_t ) );

            (*dlip)->dli_oc = oc;
            (*dlip)->dli_ad = ad;
            (*dlip)->dli_dlm = (dynlist_map_t *)ch_calloc( 1, sizeof( dynlist_map_t ) );
            (*dlip)->dli_dlm->dlm_member_ad = member_ad;
            (*dlip)->dli_dlm->dlm_mapped_ad = NULL;

            rc = dynlist_build_def_filter( *dlip );

            } break;

      default:
            rc = 1;
            break;
      }

      return rc;
}
#endif

static int
dynlist_db_open(
      BackendDB   *be,
      ConfigReply *cr )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      dynlist_info_t          *dli = (dynlist_info_t *)on->on_bi.bi_private;
      ObjectClass       *oc = NULL;
      AttributeDescription    *ad = NULL;
      const char  *text;
      int rc;

      if ( dli == NULL ) {
            dli = ch_calloc( 1, sizeof( dynlist_info_t ) );
            on->on_bi.bi_private = (void *)dli;
      }

      for ( ; dli; dli = dli->dli_next ) {
            if ( dli->dli_oc == NULL ) {
                  if ( oc == NULL ) {
                        oc = oc_find( "groupOfURLs" );
                        if ( oc == NULL ) {
                              snprintf( cr->msg, sizeof( cr->msg),
                                    "unable to fetch objectClass \"groupOfURLs\"" );
                              Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s.\n", cr->msg, 0, 0 );
                              return 1;
                        }
                  }

                  dli->dli_oc = oc;
            }

            if ( dli->dli_ad == NULL ) {
                  if ( ad == NULL ) {
                        rc = slap_str2ad( "memberURL", &ad, &text );
                        if ( rc != LDAP_SUCCESS ) {
                              snprintf( cr->msg, sizeof( cr->msg),
                                    "unable to fetch attributeDescription \"memberURL\": %d (%s)",
                                    rc, text );
                              Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s.\n", cr->msg, 0, 0 );
                              return 1;
                        }
                  }
            
                  dli->dli_ad = ad;             
            }

            if ( BER_BVISNULL( &dli->dli_default_filter ) ) {
                  rc = dynlist_build_def_filter( dli );
                  if ( rc != 0 ) {
                        return rc;
                  }
            }
      }

      rc = slap_str2ad( "dgIdentity", &ad_dgIdentity, &text );
      if ( rc != LDAP_SUCCESS ) {
            snprintf( cr->msg, sizeof( cr->msg),
                  "unable to fetch attributeDescription \"dgIdentity\": %d (%s)",
                  rc, text );
            Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s\n", cr->msg, 0, 0 );
            /* Just a warning */
      }

      rc = slap_str2ad( "dgAuthz", &ad_dgAuthz, &text );
      if ( rc != LDAP_SUCCESS ) {
            snprintf( cr->msg, sizeof( cr->msg),
                  "unable to fetch attributeDescription \"dgAuthz\": %d (%s)",
                  rc, text );
            Debug( LDAP_DEBUG_ANY, "dynlist_db_open: %s\n", cr->msg, 0, 0 );
            /* Just a warning */
      }

      return 0;
}

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

      if ( on->on_bi.bi_private ) {
            dynlist_info_t    *dli = (dynlist_info_t *)on->on_bi.bi_private,
                        *dli_next;

            for ( dli_next = dli; dli_next; dli = dli_next ) {
                  dynlist_map_t *dlm;
                  dynlist_map_t *dlm_next;

                  dli_next = dli->dli_next;

                  ch_free( dli->dli_default_filter.bv_val );
                  dlm = dli->dli_dlm;
                  while ( dlm != NULL ) {
                        dlm_next = dlm->dlm_next;
                        ch_free( dlm );
                        dlm = dlm_next;
                  }
                  ch_free( dli );
            }
      }

      return 0;
}

static slap_overinst    dynlist = { { NULL } };
#ifdef TAKEOVER_DYNGROUP
static char       *obsolete_names[] = {
      "dyngroup",
      NULL
};
#endif

#if SLAPD_OVER_DYNLIST == SLAPD_MOD_DYNAMIC
static
#endif /* SLAPD_OVER_DYNLIST == SLAPD_MOD_DYNAMIC */
int
dynlist_initialize(void)
{
#ifndef OL_2_2_COMPAT
      int   rc = 0;
#endif

      dynlist.on_bi.bi_type = "dynlist";

#ifdef TAKEOVER_DYNGROUP
      /* makes dynlist incompatible with dyngroup */
      dynlist.on_bi.bi_obsolete_names = obsolete_names;
#endif

#ifdef OL_2_2_COMPAT
      dynlist.on_bi.bi_db_config = dynlist_db_config;
#else
      dynlist.on_bi.bi_db_config = config_generic_wrapper;
#endif
      dynlist.on_bi.bi_db_open = dynlist_db_open;
      dynlist.on_bi.bi_db_destroy = dynlist_db_destroy;

      dynlist.on_response = dynlist_response;

#ifndef OL_2_2_COMPAT
      dynlist.on_bi.bi_cf_ocs = dlocs;

      rc = config_register_schema( dlcfg, dlocs );
      if ( rc ) {
            return rc;
      }
#endif

      return overlay_register( &dynlist );
}

#if SLAPD_OVER_DYNLIST == SLAPD_MOD_DYNAMIC
int
init_module( int argc, char *argv[] )
{
      return dynlist_initialize();
}
#endif

#endif /* SLAPD_OVER_DYNLIST */

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