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memberof.c

/* memberof.c - back-reference for group membership */
/* $OpenLDAP: pkg/ldap/servers/slapd/overlays/memberof.c,v 1.2.2.14 2008/02/11 23:34:16 quanah Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2005-2007 Pierangelo Masarati <ando@sys-net.it>
 * 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>.
 */
/* ACKNOWLEDGMENTS:
 * This work was initially developed by Pierangelo Masarati for inclusion
 * in OpenLDAP Software, sponsored by SysNet s.r.l.
 */

#include "portable.h"

#ifdef SLAPD_OVER_MEMBEROF

#include <stdio.h>

#include "ac/string.h"
#include "ac/socket.h"

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

/*
 *    Glossary:
 *
 *          GROUP       a group object (an entry with GROUP_OC
 *                      objectClass)
 *          MEMBER            a member object (an entry whose DN is
 *                      listed as MEMBER_AT value of a GROUP)
 *          GROUP_OC    the objectClass of the group object
 *                      (default: groupOfNames)
 *          MEMBER_AT   the membership attribute, DN-valued;
 *                      note: nameAndOptionalUID is tolerated
 *                      as soon as the optionalUID is absent
 *                      (default: member)
 *          MEMBER_OF   reverse membership attribute
 *                      (default: memberOf)
 *
 *    - add:
 *          - if the entry that is being added is a GROUP,
 *            the MEMBER_AT defined as values of the add operation
 *            get the MEMBER_OF value directly from the request.
 *
 *            if configured to do so, the MEMBER objects do not exist,
 *            and no relax control is issued, either:
 *                - fail
 *                - drop non-existing members
 *            (by default: don't muck with values)
 *
 *          - if (configured to do so,) the referenced GROUP exists,
 *            the relax control is set and the user has
 *            "manage" privileges, allow to add MEMBER_OF values to
 *            generic entries.
 *
 *    - modify:
 *          - if the entry being modified is a GROUP_OC and the 
 *            MEMBER_AT attribute is modified, the MEMBER_OF value
 *            of the (existing) MEMBER_AT entries that are affected
 *            is modified according to the request:
 *                - if a MEMBER is removed from the group,
 *                  delete the corresponding MEMBER_OF
 *                - if a MEMBER is added to a group,
 *                  add the corresponding MEMBER_OF
 *
 *            We need to determine, from the database, if it is
 *            a GROUP_OC, and we need to check, from the
 *            modification list, if the MEMBER_AT attribute is being
 *            affected, and what MEMBER_AT values are affected.
 *
 *            if configured to do so, the entries corresponding to
 *            the MEMBER_AT values do not exist, and no relax control
 *            is issued, either:
 *                - fail
 *                - drop non-existing members
 *            (by default: don't muck with values)
 *
 *          - if configured to do so, the referenced GROUP exists,
 *            (the relax control is set) and the user has
 *            "manage" privileges, allow to add MEMBER_OF values to
 *            generic entries; the change is NOT automatically reflected
 *            in the MEMBER attribute of the GROUP referenced
 *            by the value of MEMBER_OF; a separate modification,
 *            with or without relax control, needs to be performed.
 *
 *    - modrdn:
 *          - if the entry being renamed is a GROUP, the MEMBER_OF
 *            value of the (existing) MEMBER objects is modified
 *            accordingly based on the newDN of the GROUP.
 *
 *            We need to determine, from the database, if it is
 *            a GROUP; the list of MEMBER objects is obtained from
 *            the database.
 *
 *            Non-existing MEMBER objects are ignored, since the
 *            MEMBER_AT is not being addressed by the operation.
 *
 *          - if the entry being renamed has the MEMBER_OF attribute,
 *            the corresponding MEMBER value must be modified in the
 *            respective group entries.
 *          
 *
 *    - delete:
 *          - if the entry being deleted is a GROUP, the (existing)
 *            MEMBER objects are modified accordingly; a copy of the 
 *            values of the MEMBER_AT is saved and, if the delete 
 *            succeeds, the MEMBER_OF value of the (existing) MEMBER
 *            objects is deleted.
 *
 *            We need to determine, from the database, if it is
 *            a GROUP.
 *
 *            Non-existing MEMBER objects are ignored, since the entry
 *            is being deleted.
 *
 *          - if the entry being deleted has the MEMBER_OF attribute,
 *            the corresponding value of the MEMBER_AT must be deleted
 *            from the respective GROUP entries.
 */

#define     SLAPD_MEMBEROF_ATTR     "memberOf"

static slap_overinst          memberof;

typedef struct memberof_t {
      struct berval           mo_dn;
      struct berval           mo_ndn;

      ObjectClass       *mo_oc_group;
      AttributeDescription    *mo_ad_member;
      AttributeDescription    *mo_ad_memberof;
      
      struct berval           mo_groupFilterstr;
      AttributeAssertion      mo_groupAVA;
      Filter                  mo_groupFilter;

      struct berval           mo_memberFilterstr;
      Filter                  mo_memberFilter;

      unsigned          mo_flags;
#define     MEMBEROF_NONE           0x00U
#define     MEMBEROF_FDANGLING_DROP 0x01U
#define     MEMBEROF_FDANGLING_ERROR      0x02U
#define     MEMBEROF_FDANGLING_MASK (MEMBEROF_FDANGLING_DROP|MEMBEROF_FDANGLING_ERROR)
#define     MEMBEROF_FREFINT  0x04U
#define     MEMBEROF_FREVERSE 0x08U

      ber_int_t         mo_dangling_err;

#define MEMBEROF_CHK(mo,f) \
      (((mo)->mo_flags & (f)) == (f))
#define MEMBEROF_DANGLING_CHECK(mo) \
      ((mo)->mo_flags & MEMBEROF_FDANGLING_MASK)
#define MEMBEROF_DANGLING_DROP(mo) \
      MEMBEROF_CHK((mo),MEMBEROF_FDANGLING_DROP)
#define MEMBEROF_DANGLING_ERROR(mo) \
      MEMBEROF_CHK((mo),MEMBEROF_FDANGLING_ERROR)
#define MEMBEROF_REFINT(mo) \
      MEMBEROF_CHK((mo),MEMBEROF_FREFINT)
#define MEMBEROF_REVERSE(mo) \
      MEMBEROF_CHK((mo),MEMBEROF_FREVERSE)
} memberof_t;

typedef enum memberof_is_t {
      MEMBEROF_IS_NONE = 0x00,
      MEMBEROF_IS_GROUP = 0x01,
      MEMBEROF_IS_MEMBER = 0x02,
      MEMBEROF_IS_BOTH = (MEMBEROF_IS_GROUP|MEMBEROF_IS_MEMBER)
} memberof_is_t;

/*
 * failover storage for member attribute values of groups being deleted
 * handles [no]thread cases.
 */
static BerVarray  saved_member_vals;
static BerVarray  saved_memberof_vals;

static void
memberof_saved_member_free( void *key, void *data )
{
      ber_bvarray_free( (BerVarray)data );
}

static BerVarray
memberof_saved_member_get( Operation *op, void *keyp )
{
      void        *vals;
      BerVarray   *key = (BerVarray *)keyp;

      assert( op != NULL );

      if ( op->o_threadctx == NULL ) {
            vals = *key;
            *key = NULL;

      } else {
            ldap_pvt_thread_pool_setkey( op->o_threadctx,
                        key, NULL, 0, &vals, NULL );
      }

      return vals;
}

static void
memberof_saved_member_set( Operation *op, void *keyp, BerVarray vals )
{
      BerVarray   saved_vals = NULL;
      BerVarray   *key = (BerVarray*)keyp;

      assert( op != NULL );

      if ( vals ) {
            ber_bvarray_dup_x( &saved_vals, vals, NULL );
      }

      if ( op->o_threadctx == NULL ) {
            if ( *key ) {
                  ber_bvarray_free( *key );
            }
            *key = saved_vals;

      } else {
            void  *old_vals = NULL;

            ldap_pvt_thread_pool_setkey( op->o_threadctx, key,
                        saved_vals, memberof_saved_member_free, &old_vals, NULL );
            if ( old_vals != NULL ) {
                  ber_bvarray_free( old_vals );
            }
      }
}

typedef struct memberof_cookie_t {
      AttributeDescription    *ad;
      void              *key;
      int               foundit;
} memberof_cookie_t;

static int
memberof_isGroupOrMember_cb( Operation *op, SlapReply *rs )
{
      if ( rs->sr_type == REP_SEARCH ) {
            memberof_cookie_t *mc;

            mc = (memberof_cookie_t *)op->o_callback->sc_private;
            mc->foundit = 1;
      }

      return 0;
}

/*
 * callback for internal search that saves the member attribute values
 * of groups being deleted.
 */
static int
memberof_saveMember_cb( Operation *op, SlapReply *rs )
{
      if ( rs->sr_type == REP_SEARCH ) {
            memberof_cookie_t *mc;
            Attribute         *a;
            BerVarray         vals = NULL;

            mc = (memberof_cookie_t *)op->o_callback->sc_private;
            mc->foundit = 1;

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

            a = attr_find( rs->sr_entry->e_attrs, mc->ad );
            if ( a != NULL ) {
                  vals = a->a_nvals;
            }

            memberof_saved_member_set( op, mc->key, vals );

            if ( a && attr_find( a->a_next, mc->ad ) != NULL ) {
                  Debug( LDAP_DEBUG_ANY,
                        "%s: memberof_saveMember_cb(\"%s\"): "
                        "more than one occurrence of \"%s\" "
                        "attribute.\n",
                        op->o_log_prefix,
                        rs->sr_entry->e_name.bv_val,
                        mc->ad->ad_cname.bv_val );
            }
      }

      return 0;
}

/*
 * the delete hook performs an internal search that saves the member
 * attribute values of groups being deleted.
 */
static int
memberof_isGroupOrMember( Operation *op, memberof_is_t *iswhatp )
{
      slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t        *mo = (memberof_t *)on->on_bi.bi_private;

      Operation         op2 = *op;
      SlapReply         rs2 = { REP_RESULT };
      slap_callback           cb = { 0 };
      memberof_cookie_t mc;
      AttributeName           an[ 2 ];

      memberof_is_t           iswhat = MEMBEROF_IS_NONE;

      assert( iswhatp != NULL );
      assert( *iswhatp != MEMBEROF_IS_NONE );

      cb.sc_private = &mc;
      if ( op->o_tag == LDAP_REQ_DELETE ) {
            cb.sc_response = memberof_saveMember_cb;

      } else {
            cb.sc_response = memberof_isGroupOrMember_cb;
      }

      op2.o_tag = LDAP_REQ_SEARCH;
      op2.o_callback = &cb;
      op2.o_dn = op->o_bd->be_rootdn;
      op2.o_ndn = op->o_bd->be_rootndn;

      op2.ors_scope = LDAP_SCOPE_BASE;
      op2.ors_deref = LDAP_DEREF_NEVER;
      BER_BVZERO( &an[ 1 ].an_name );
      op2.ors_attrs = an;
      op2.ors_attrsonly = 0;
      op2.ors_limit = NULL;
      op2.ors_slimit = 1;
      op2.ors_tlimit = SLAP_NO_LIMIT;

      if ( *iswhatp & MEMBEROF_IS_GROUP ) {
            mc.ad = mo->mo_ad_member;
            mc.key = &saved_member_vals;
            mc.foundit = 0;
            an[ 0 ].an_desc = mo->mo_ad_member;
            an[ 0 ].an_name = an[ 0 ].an_desc->ad_cname;
            op2.ors_filterstr = mo->mo_groupFilterstr;
            op2.ors_filter = &mo->mo_groupFilter;

            op2.o_bd->bd_info = (BackendInfo *)on->on_info;
            (void)op->o_bd->be_search( &op2, &rs2 );
            op2.o_bd->bd_info = (BackendInfo *)on;

            if ( mc.foundit ) {
                  iswhat |= MEMBEROF_IS_GROUP;

            } else {
                  memberof_saved_member_set( op, mc.key, NULL );
            }
      }

      if ( *iswhatp & MEMBEROF_IS_MEMBER ) {
            mc.ad = mo->mo_ad_memberof;
            mc.key = &saved_memberof_vals;
            mc.foundit = 0;
            an[ 0 ].an_desc = mo->mo_ad_memberof;
            an[ 0 ].an_name = an[ 0 ].an_desc->ad_cname;
            op2.ors_filterstr = mo->mo_memberFilterstr;
            op2.ors_filter = &mo->mo_memberFilter;

            op2.o_bd->bd_info = (BackendInfo *)on->on_info;
            (void)op->o_bd->be_search( &op2, &rs2 );
            op2.o_bd->bd_info = (BackendInfo *)on;

            if ( mc.foundit ) {
                  iswhat |= MEMBEROF_IS_MEMBER;

            } else {
                  memberof_saved_member_set( op, mc.key, NULL );
            }
      }

      *iswhatp = iswhat;

      return LDAP_SUCCESS;
}

/*
 * response callback that adds memberof values when a group is modified.
 */
static int
memberof_value_modify(
      Operation         *op,
      SlapReply         *rs,
      struct berval           *ndn,
      AttributeDescription    *ad,
      struct berval           *old_dn,
      struct berval           *old_ndn,
      struct berval           *new_dn,
      struct berval           *new_ndn )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      Operation   op2 = *op;
      SlapReply   rs2 = { REP_RESULT };
      slap_callback     cb = { NULL, slap_null_cb, NULL, NULL };
      Modifications     mod[ 2 ] = { { { 0 } } }, *ml;
      struct berval     values[ 4 ], nvalues[ 4 ];
      int         mcnt = 0;

      op2.o_tag = LDAP_REQ_MODIFY;

      op2.o_req_dn = *ndn;
      op2.o_req_ndn = *ndn;

      op2.o_bd->bd_info = (BackendInfo *)on->on_info;

      op2.o_callback = &cb;
      op2.o_dn = op->o_bd->be_rootdn;
      op2.o_ndn = op->o_bd->be_rootndn;
      op2.orm_modlist = NULL;

      if ( !BER_BVISNULL( &mo->mo_ndn ) ) {
            ml = &mod[ mcnt ];
            ml->sml_numvals = 1;
            ml->sml_values = &values[ 0 ];
            ml->sml_values[ 0 ] = mo->mo_dn;
            BER_BVZERO( &ml->sml_values[ 1 ] );
            ml->sml_nvalues = &nvalues[ 0 ];
            ml->sml_nvalues[ 0 ] = mo->mo_ndn;
            BER_BVZERO( &ml->sml_nvalues[ 1 ] );
            ml->sml_desc = slap_schema.si_ad_modifiersName;
            ml->sml_type = ml->sml_desc->ad_cname;
            ml->sml_op = LDAP_MOD_REPLACE;
            ml->sml_flags = SLAP_MOD_INTERNAL;
            ml->sml_next = op2.orm_modlist;
            op2.orm_modlist = ml;

            mcnt++;
      }

      ml = &mod[ mcnt ];
      ml->sml_numvals = 1;
      ml->sml_values = &values[ 2 ];
      BER_BVZERO( &ml->sml_values[ 1 ] );
      ml->sml_nvalues = &nvalues[ 2 ];
      BER_BVZERO( &ml->sml_nvalues[ 1 ] );
      ml->sml_desc = ad;
      ml->sml_type = ml->sml_desc->ad_cname;
      ml->sml_flags = SLAP_MOD_INTERNAL;
      ml->sml_next = op2.orm_modlist;
      op2.orm_modlist = ml;

      if ( new_ndn != NULL ) {
            assert( !BER_BVISNULL( new_dn ) );
            assert( !BER_BVISNULL( new_ndn ) );

            ml = &mod[ mcnt ];
            ml->sml_op = LDAP_MOD_ADD;

            ml->sml_values[ 0 ] = *new_dn;
            ml->sml_nvalues[ 0 ] = *new_ndn;

            (void)op->o_bd->be_modify( &op2, &rs2 );
            if ( rs2.sr_err != LDAP_SUCCESS ) {
                  char buf[ SLAP_TEXT_BUFLEN ];
                  snprintf( buf, sizeof( buf ),
                        "memberof_value_modify %s=\"%s\" failed err=%d text=%s",
                        ad->ad_cname.bv_val, new_dn->bv_val, rs2.sr_err,
                        rs2.sr_text ? rs2.sr_text : "" );
                  Debug( LDAP_DEBUG_ANY, "%s: %s\n",
                        op->o_log_prefix, buf, 0 );
            }

            assert( op2.orm_modlist == &mod[ mcnt ] );
            assert( mcnt == 0 || op2.orm_modlist->sml_next == &mod[ 0 ] );
            ml = op2.orm_modlist->sml_next;
            if ( mcnt == 1 ) {
                  assert( ml == &mod[ 0 ] );
                  ml = ml->sml_next;
            }
            if ( ml != NULL ) {
                  slap_mods_free( ml, 1 );
            }

            mod[ 0 ].sml_next = NULL;
      }

      if ( old_ndn != NULL ) {
            assert( !BER_BVISNULL( old_dn ) );
            assert( !BER_BVISNULL( old_ndn ) );

            ml = &mod[ mcnt ];
            ml->sml_op = LDAP_MOD_DELETE;

            ml->sml_values[ 0 ] = *old_dn;
            ml->sml_nvalues[ 0 ] = *old_ndn;

            (void)op->o_bd->be_modify( &op2, &rs2 );
            if ( rs2.sr_err != LDAP_SUCCESS ) {
                  char buf[ SLAP_TEXT_BUFLEN ];
                  snprintf( buf, sizeof( buf ),
                        "memberof_value_modify %s=\"%s\" failed err=%d text=%s",
                        ad->ad_cname.bv_val, old_dn->bv_val, rs2.sr_err,
                        rs2.sr_text ? rs2.sr_text : "" );
                  Debug( LDAP_DEBUG_ANY, "%s: %s\n",
                        op->o_log_prefix, buf, 0 );
            }

            assert( op2.orm_modlist == &mod[ mcnt ] );
            ml = op2.orm_modlist->sml_next;
            if ( mcnt == 1 ) {
                  assert( ml == &mod[ 0 ] );
                  ml = ml->sml_next;
            }
            if ( ml != NULL ) {
                  slap_mods_free( ml, 1 );
            }
      }

      /* FIXME: if old_group_ndn doesn't exist, both delete __and__
       * add will fail; better split in two operations, although
       * not optimal in terms of performance.  At least it would
       * move towards self-repairing capabilities. */

      op2.o_bd->bd_info = (BackendInfo *)on;

      return rs2.sr_err;
}

static int
memberof_op_add( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      Attribute   **ap, **map = NULL;
      int         rc = SLAP_CB_CONTINUE;
      int         i;
      struct berval     save_dn, save_ndn;

      if ( op->ora_e->e_attrs == NULL ) {
            /* FIXME: global overlay; need to deal with */
            Debug( LDAP_DEBUG_ANY, "%s: memberof_op_add(\"%s\"): "
                  "consistency checks not implemented when overlay "
                  "is instantiated as global.\n",
                  op->o_log_prefix, op->o_req_dn.bv_val, 0 );
            return SLAP_CB_CONTINUE;
      }

      if ( MEMBEROF_REVERSE( mo ) ) {
            for ( ap = &op->ora_e->e_attrs; *ap; ap = &(*ap)->a_next ) {
                  Attribute   *a = *ap;

                  if ( a->a_desc == mo->mo_ad_memberof ) {
                        map = ap;
                        break;
                  }
            }
      }

      save_dn = op->o_dn;
      save_ndn = op->o_ndn;

      if ( MEMBEROF_DANGLING_CHECK( mo )
                  && !get_relax( op )
                  && is_entry_objectclass_or_sub( op->ora_e, mo->mo_oc_group ) )
      {
            op->o_dn = op->o_bd->be_rootdn;
            op->o_dn = op->o_bd->be_rootndn;
            op->o_bd->bd_info = (BackendInfo *)on->on_info;

            for ( ap = &op->ora_e->e_attrs; *ap; ) {
                  Attribute   *a = *ap;

                  if ( !is_ad_subtype( a->a_desc, mo->mo_ad_member ) ) {
                        ap = &a->a_next;
                        continue;
                  }

                  assert( a->a_nvals != NULL );

                  for ( i = 0; !BER_BVISNULL( &a->a_nvals[ i ] ); i++ ) {
                        Entry       *e = NULL;

                        rc = be_entry_get_rw( op, &a->a_nvals[ i ],
                                    NULL, NULL, 0, &e );
                        if ( rc == LDAP_SUCCESS ) {
                              be_entry_release_r( op, e );
                              continue;
                        }

                        if ( MEMBEROF_DANGLING_ERROR( mo ) ) {
                              rc = rs->sr_err = mo->mo_dangling_err;
                              rs->sr_text = "adding non-existing object "
                                    "as group member";
                              send_ldap_result( op, rs );
                              goto done;
                        }

                        if ( MEMBEROF_DANGLING_DROP( mo ) ) {
                              int   j;
      
                              Debug( LDAP_DEBUG_ANY, "%s: memberof_op_add(\"%s\"): "
                                    "member=\"%s\" does not exist (stripping...)\n",
                                    op->o_log_prefix, op->ora_e->e_name.bv_val,
                                    a->a_vals[ i ].bv_val );
      
                              for ( j = i + 1; !BER_BVISNULL( &a->a_nvals[ j ] ); j++ );
                              ber_memfree( a->a_vals[ i ].bv_val );
                              BER_BVZERO( &a->a_vals[ i ] );
                              if ( a->a_nvals != a->a_vals ) {
                                    ber_memfree( a->a_nvals[ i ].bv_val );
                                    BER_BVZERO( &a->a_nvals[ i ] );
                              }
                              if ( j - i == 1 ) {
                                    break;
                              }
            
                              AC_MEMCPY( &a->a_vals[ i ], &a->a_vals[ i + 1 ],
                                    sizeof( struct berval ) * ( j - i ) );
                              if ( a->a_nvals != a->a_vals ) {
                                    AC_MEMCPY( &a->a_nvals[ i ], &a->a_nvals[ i + 1 ],
                                          sizeof( struct berval ) * ( j - i ) );
                              }
                              i--;
                        }
                  }

                  /* If all values have been removed,
                   * remove the attribute itself. */
                  if ( BER_BVISNULL( &a->a_nvals[ 0 ] ) ) {
                        *ap = a->a_next;
                        attr_free( a );
      
                  } else {
                        ap = &a->a_next;
                  }
            }
            op->o_dn = save_dn;
            op->o_ndn = save_ndn;
            op->o_bd->bd_info = (BackendInfo *)on;
      }

      if ( map != NULL ) {
            Attribute         *a = *map;
            AccessControlState      acl_state = ACL_STATE_INIT;

            for ( i = 0; !BER_BVISNULL( &a->a_nvals[ i ] ); i++ ) {
                  Entry       *e;

                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
                  /* access is checked with the original identity */
                  rc = access_allowed( op, op->ora_e, mo->mo_ad_memberof,
                              &a->a_nvals[ i ], ACL_WADD,
                              &acl_state );
                  if ( rc == 0 ) {
                        rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
                        rs->sr_text = NULL;
                        send_ldap_result( op, rs );
                        goto done;
                  }
                  rc = be_entry_get_rw( op, &a->a_nvals[ i ],
                              NULL, NULL, 0, &e );
                  op->o_bd->bd_info = (BackendInfo *)on;
                  if ( rc != LDAP_SUCCESS ) {
                        if ( get_relax( op ) ) {
                              continue;
                        }

                        if ( MEMBEROF_DANGLING_ERROR( mo ) ) {
                              rc = rs->sr_err = mo->mo_dangling_err;
                              rs->sr_text = "adding non-existing object "
                                    "as memberof";
                              send_ldap_result( op, rs );
                              goto done;
                        }

                        if ( MEMBEROF_DANGLING_DROP( mo ) ) {
                              int   j;
      
                              Debug( LDAP_DEBUG_ANY, "%s: memberof_op_add(\"%s\"): "
                                    "memberof=\"%s\" does not exist (stripping...)\n",
                                    op->o_log_prefix, op->ora_e->e_name.bv_val,
                                    a->a_nvals[ i ].bv_val );
      
                              for ( j = i + 1; !BER_BVISNULL( &a->a_nvals[ j ] ); j++ );
                              ber_memfree( a->a_vals[ i ].bv_val );
                              BER_BVZERO( &a->a_vals[ i ] );
                              if ( a->a_nvals != a->a_vals ) {
                                    ber_memfree( a->a_nvals[ i ].bv_val );
                                    BER_BVZERO( &a->a_nvals[ i ] );
                              }
                              if ( j - i == 1 ) {
                                    break;
                              }
            
                              AC_MEMCPY( &a->a_vals[ i ], &a->a_vals[ i + 1 ],
                                    sizeof( struct berval ) * ( j - i ) );
                              if ( a->a_nvals != a->a_vals ) {
                                    AC_MEMCPY( &a->a_nvals[ i ], &a->a_nvals[ i + 1 ],
                                          sizeof( struct berval ) * ( j - i ) );
                              }
                              i--;
                        }
                        
                        continue;
                  }

                  /* access is checked with the original identity */
                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
                  rc = access_allowed( op, e, mo->mo_ad_member,
                              &op->o_req_ndn, ACL_WADD, NULL );
                  be_entry_release_r( op, e );
                  op->o_bd->bd_info = (BackendInfo *)on;

                  if ( !rc ) {
                        rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
                        rs->sr_text = "insufficient access to object referenced by memberof";
                        send_ldap_result( op, rs );
                        goto done;
                  }
            }

            if ( BER_BVISNULL( &a->a_nvals[ 0 ] ) ) {
                  *map = a->a_next;
                  attr_free( a );
            }
      }

      rc = SLAP_CB_CONTINUE;
      
done:;
      op->o_dn = save_dn;
      op->o_ndn = save_ndn;
      op->o_bd->bd_info = (BackendInfo *)on;

      return rc;
}

static int
memberof_op_delete( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      memberof_is_t     iswhat = MEMBEROF_IS_GROUP;

      if ( MEMBEROF_REFINT( mo ) ) {
            iswhat = MEMBEROF_IS_BOTH;
      }

      memberof_isGroupOrMember( op, &iswhat );

      return SLAP_CB_CONTINUE;
}

static int
memberof_op_modify( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      Modifications     **mlp, **mmlp = NULL;
      int         rc = SLAP_CB_CONTINUE;
      struct berval     save_dn, save_ndn;
      memberof_is_t     iswhat = MEMBEROF_IS_GROUP;

      if ( MEMBEROF_REVERSE( mo ) ) {
            for ( mlp = &op->orm_modlist; *mlp; mlp = &(*mlp)->sml_next ) {
                  Modifications     *ml = *mlp;

                  if ( ml->sml_desc == mo->mo_ad_memberof ) {
                        mmlp = mlp;
                        break;
                  }
            }
      }

      save_dn = op->o_dn;
      save_ndn = op->o_ndn;

      if ( memberof_isGroupOrMember( op, &iswhat ) == LDAP_SUCCESS
            && ( iswhat & MEMBEROF_IS_GROUP ) )
      {
            Modifications *ml;
            int save_member = 0;

            for ( ml = op->orm_modlist; ml; ml = ml->sml_next ) {
                  if ( ml->sml_desc == mo->mo_ad_member ) {
                        switch ( ml->sml_op ) {
                        case LDAP_MOD_DELETE:
                        case LDAP_MOD_REPLACE:
                              save_member = 1;
                              break;
                        }
                  }
            }

            if ( save_member ) {
                  BerVarray   vals = NULL;

                  op->o_dn = op->o_bd->be_rootdn;
                  op->o_dn = op->o_bd->be_rootndn;
                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
                  rc = backend_attribute( op, NULL, &op->o_req_ndn,
                              mo->mo_ad_member, &vals, ACL_READ );
                  op->o_bd->bd_info = (BackendInfo *)on;
                  if ( rc == LDAP_SUCCESS && vals != NULL ) {
                        memberof_saved_member_set( op, &saved_member_vals, vals );
                        ber_bvarray_free_x( vals, op->o_tmpmemctx );
                  }
            }

            if ( MEMBEROF_DANGLING_CHECK( mo )
                        && !get_relax( op ) )
            {
                  op->o_dn = op->o_bd->be_rootdn;
                  op->o_dn = op->o_bd->be_rootndn;
                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
            
                  assert( op->orm_modlist != NULL );
            
                  for ( mlp = &op->orm_modlist; *mlp; ) {
                        Modifications     *ml = *mlp;
                        int         i;
            
                        if ( !is_ad_subtype( ml->sml_desc, mo->mo_ad_member ) ) {
                              mlp = &ml->sml_next;
                              continue;
                        }
            
                        switch ( ml->sml_op ) {
                        case LDAP_MOD_DELETE:
                              /* we don't care about cancellations: if the value
                               * exists, fine; if it doesn't, we let the underlying
                               * database fail as appropriate; */
                              mlp = &ml->sml_next;
                              break;
            
                        case LDAP_MOD_REPLACE:
                        case LDAP_MOD_ADD:
                              /* NOTE: right now, the attributeType we use
                               * for member must have a normalized value */
                              assert( ml->sml_nvalues != NULL );
            
                              for ( i = 0; !BER_BVISNULL( &ml->sml_nvalues[ i ] ); i++ ) {
                                    int         rc;
                                    Entry       *e;
            
                                    if ( be_entry_get_rw( op, &ml->sml_nvalues[ i ],
                                                NULL, NULL, 0, &e ) == LDAP_SUCCESS )
                                    {
                                          be_entry_release_r( op, e );
                                          continue;
                                    }
            
                                    if ( MEMBEROF_DANGLING_ERROR( mo ) ) {
                                          rc = rs->sr_err = mo->mo_dangling_err;
                                          rs->sr_text = "adding non-existing object "
                                                "as group member";
                                          send_ldap_result( op, rs );
                                          goto done;
                                    }
            
                                    if ( MEMBEROF_DANGLING_DROP( mo ) ) {
                                          int   j;
            
                                          Debug( LDAP_DEBUG_ANY, "%s: memberof_op_modify(\"%s\"): "
                                                "member=\"%s\" does not exist (stripping...)\n",
                                                op->o_log_prefix, op->o_req_dn.bv_val,
                                                ml->sml_nvalues[ i ].bv_val );
            
                                          for ( j = i + 1; !BER_BVISNULL( &ml->sml_nvalues[ j ] ); j++ );
                                          ber_memfree( ml->sml_values[ i ].bv_val );
                                          BER_BVZERO( &ml->sml_values[ i ] );
                                          ber_memfree( ml->sml_nvalues[ i ].bv_val );
                                          BER_BVZERO( &ml->sml_nvalues[ i ] );
                                          ml->sml_numvals--;
                                          if ( j - i == 1 ) {
                                                break;
                                          }
            
                                          AC_MEMCPY( &ml->sml_values[ i ], &ml->sml_values[ i + 1 ],
                                                sizeof( struct berval ) * ( j - i ) );
                                          AC_MEMCPY( &ml->sml_nvalues[ i ], &ml->sml_nvalues[ i + 1 ],
                                                sizeof( struct berval ) * ( j - i ) );
                                          i--;
                                    }
                              }
            
                              if ( BER_BVISNULL( &ml->sml_nvalues[ 0 ] ) ) {
                                    *mlp = ml->sml_next;
                                    slap_mod_free( &ml->sml_mod, 0 );
                                    free( ml );
            
                              } else {
                                    mlp = &ml->sml_next;
                              }
            
                              break;
            
                        default:
                              assert( 0 );
                        }
                  }
            }
      }
      
      if ( mmlp != NULL ) {
            Modifications     *ml = *mmlp;
            int         i;
            Entry       *target;

            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            rc = be_entry_get_rw( op, &op->o_req_ndn,
                        NULL, NULL, 0, &target );
            op->o_bd->bd_info = (BackendInfo *)on;
            if ( rc != LDAP_SUCCESS ) {
                  rc = rs->sr_err = LDAP_NO_SUCH_OBJECT;
                  send_ldap_result( op, rs );
                  goto done;
            }

            switch ( ml->sml_op ) {
            case LDAP_MOD_DELETE:
                  if ( ml->sml_nvalues != NULL ) {
                        AccessControlState      acl_state = ACL_STATE_INIT;

                        for ( i = 0; !BER_BVISNULL( &ml->sml_nvalues[ i ] ); i++ ) {
                              Entry       *e;

                              op->o_bd->bd_info = (BackendInfo *)on->on_info;
                              /* access is checked with the original identity */
                              rc = access_allowed( op, target,
                                          mo->mo_ad_memberof,
                                          &ml->sml_nvalues[ i ],
                                          ACL_WDEL,
                                          &acl_state );
                              if ( rc == 0 ) {
                                    rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
                                    rs->sr_text = NULL;
                                    send_ldap_result( op, rs );
                                    goto done2;
                              }

                              rc = be_entry_get_rw( op, &ml->sml_nvalues[ i ],
                                          NULL, NULL, 0, &e );
                              op->o_bd->bd_info = (BackendInfo *)on;
                              if ( rc != LDAP_SUCCESS ) {
                                    if ( get_relax( op ) ) {
                                          continue;
                                    }

                                    if ( MEMBEROF_DANGLING_ERROR( mo ) ) {
                                          rc = rs->sr_err = mo->mo_dangling_err;
                                          rs->sr_text = "deleting non-existing object "
                                                "as memberof";
                                          send_ldap_result( op, rs );
                                          goto done2;
                                    }

                                    if ( MEMBEROF_DANGLING_DROP( mo ) ) {
                                          int   j;
      
                                          Debug( LDAP_DEBUG_ANY, "%s: memberof_op_modify(\"%s\"): "
                                                "memberof=\"%s\" does not exist (stripping...)\n",
                                                op->o_log_prefix, op->o_req_ndn.bv_val,
                                                ml->sml_nvalues[ i ].bv_val );
      
                                          for ( j = i + 1; !BER_BVISNULL( &ml->sml_nvalues[ j ] ); j++ );
                                          ber_memfree( ml->sml_values[ i ].bv_val );
                                          BER_BVZERO( &ml->sml_values[ i ] );
                                          if ( ml->sml_nvalues != ml->sml_values ) {
                                                ber_memfree( ml->sml_nvalues[ i ].bv_val );
                                                BER_BVZERO( &ml->sml_nvalues[ i ] );
                                          }
                                          ml->sml_numvals--;
                                          if ( j - i == 1 ) {
                                                break;
                                          }
            
                                          AC_MEMCPY( &ml->sml_values[ i ], &ml->sml_values[ i + 1 ],
                                                sizeof( struct berval ) * ( j - i ) );
                                          if ( ml->sml_nvalues != ml->sml_values ) {
                                                AC_MEMCPY( &ml->sml_nvalues[ i ], &ml->sml_nvalues[ i + 1 ],
                                                      sizeof( struct berval ) * ( j - i ) );
                                          }
                                          i--;
                                    }

                                    continue;
                              }

                              /* access is checked with the original identity */
                              op->o_bd->bd_info = (BackendInfo *)on->on_info;
                              rc = access_allowed( op, e, mo->mo_ad_member,
                                          &op->o_req_ndn,
                                          ACL_WDEL, NULL );
                              be_entry_release_r( op, e );
                              op->o_bd->bd_info = (BackendInfo *)on;

                              if ( !rc ) {
                                    rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
                                    rs->sr_text = "insufficient access to object referenced by memberof";
                                    send_ldap_result( op, rs );
                                    goto done;
                              }
                        }

                        if ( BER_BVISNULL( &ml->sml_nvalues[ 0 ] ) ) {
                              *mmlp = ml->sml_next;
                              slap_mod_free( &ml->sml_mod, 0 );
                              free( ml );
                        }

                        break;
                  }
                  /* fall thru */

            case LDAP_MOD_REPLACE:

                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
                  /* access is checked with the original identity */
                  rc = access_allowed( op, target,
                              mo->mo_ad_memberof,
                              NULL,
                              ACL_WDEL, NULL );
                  op->o_bd->bd_info = (BackendInfo *)on;
                  if ( rc == 0 ) {
                        rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
                        rs->sr_text = NULL;
                        send_ldap_result( op, rs );
                        goto done2;
                  }

                  if ( ml->sml_op == LDAP_MOD_DELETE ) {
                        break;
                  }
                  /* fall thru */

            case LDAP_MOD_ADD: {
                  AccessControlState      acl_state = ACL_STATE_INIT;

                  for ( i = 0; !BER_BVISNULL( &ml->sml_nvalues[ i ] ); i++ ) {
                        Entry       *e;

                        op->o_bd->bd_info = (BackendInfo *)on->on_info;
                        /* access is checked with the original identity */
                        rc = access_allowed( op, target,
                                    mo->mo_ad_memberof,
                                    &ml->sml_nvalues[ i ],
                                    ACL_WADD,
                                    &acl_state );
                        if ( rc == 0 ) {
                              rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
                              rs->sr_text = NULL;
                              send_ldap_result( op, rs );
                              goto done2;
                        }

                        rc = be_entry_get_rw( op, &ml->sml_nvalues[ i ],
                                    NULL, NULL, 0, &e );
                        op->o_bd->bd_info = (BackendInfo *)on;
                        if ( rc != LDAP_SUCCESS ) {
                              if ( MEMBEROF_DANGLING_ERROR( mo ) ) {
                                    rc = rs->sr_err = mo->mo_dangling_err;
                                    rs->sr_text = "adding non-existing object "
                                          "as memberof";
                                    send_ldap_result( op, rs );
                                    goto done2;
                              }

                              if ( MEMBEROF_DANGLING_DROP( mo ) ) {
                                    int   j;

                                    Debug( LDAP_DEBUG_ANY, "%s: memberof_op_modify(\"%s\"): "
                                          "memberof=\"%s\" does not exist (stripping...)\n",
                                          op->o_log_prefix, op->o_req_ndn.bv_val,
                                          ml->sml_nvalues[ i ].bv_val );

                                    for ( j = i + 1; !BER_BVISNULL( &ml->sml_nvalues[ j ] ); j++ );
                                    ber_memfree( ml->sml_values[ i ].bv_val );
                                    BER_BVZERO( &ml->sml_values[ i ] );
                                    if ( ml->sml_nvalues != ml->sml_values ) {
                                          ber_memfree( ml->sml_nvalues[ i ].bv_val );
                                          BER_BVZERO( &ml->sml_nvalues[ i ] );
                                    }
                                    ml->sml_numvals--;
                                    if ( j - i == 1 ) {
                                          break;
                                    }
      
                                    AC_MEMCPY( &ml->sml_values[ i ], &ml->sml_values[ i + 1 ],
                                          sizeof( struct berval ) * ( j - i ) );
                                    if ( ml->sml_nvalues != ml->sml_values ) {
                                          AC_MEMCPY( &ml->sml_nvalues[ i ], &ml->sml_nvalues[ i + 1 ],
                                                sizeof( struct berval ) * ( j - i ) );
                                    }
                                    i--;
                              }

                              continue;
                        }

                        /* access is checked with the original identity */
                        op->o_bd->bd_info = (BackendInfo *)on->on_info;
                        rc = access_allowed( op, e, mo->mo_ad_member,
                                    &op->o_req_ndn,
                                    ACL_WDEL, NULL );
                        be_entry_release_r( op, e );
                        op->o_bd->bd_info = (BackendInfo *)on;

                        if ( !rc ) {
                              rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
                              rs->sr_text = "insufficient access to object referenced by memberof";
                              send_ldap_result( op, rs );
                              goto done;
                        }
                  }

                  if ( BER_BVISNULL( &ml->sml_nvalues[ 0 ] ) ) {
                        *mmlp = ml->sml_next;
                        slap_mod_free( &ml->sml_mod, 0 );
                        free( ml );
                  }

                  } break;

            default:
                  assert( 0 );
            }

done2:;
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            be_entry_release_r( op, target );
            op->o_bd->bd_info = (BackendInfo *)on;
      }

      rc = SLAP_CB_CONTINUE;

done:;
      op->o_dn = save_dn;
      op->o_ndn = save_ndn;
      op->o_bd->bd_info = (BackendInfo *)on;

      return rc;
}

/*
 * response callback that adds memberof values when a group is added.
 */
static int
memberof_res_add( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      int         i;

      if ( MEMBEROF_REVERSE( mo ) ) {
            Attribute   *ma;

            ma = attr_find( op->ora_e->e_attrs, mo->mo_ad_memberof );
            if ( ma != NULL ) {
                  Operation   op2 = *op;
                  SlapReply   rs2 = { 0 };

                  /* relax is required to allow to add
                   * a non-existing member */
                  op2.o_relax = SLAP_CONTROL_CRITICAL;

                  for ( i = 0; !BER_BVISNULL( &ma->a_nvals[ i ] ); i++ ) {
            
                        /* the modification is attempted
                         * with the original identity */
                        (void)memberof_value_modify( &op2, &rs2,
                              &ma->a_nvals[ i ], mo->mo_ad_member,
                              NULL, NULL, &op->o_req_dn, &op->o_req_ndn );
                  }
            }
      }

      if ( is_entry_objectclass_or_sub( op->ora_e, mo->mo_oc_group ) ) {
            Attribute   *a;

            for ( a = attrs_find( op->ora_e->e_attrs, mo->mo_ad_member );
                        a != NULL;
                        a = attrs_find( a->a_next, mo->mo_ad_member ) )
            {
                  for ( i = 0; !BER_BVISNULL( &a->a_nvals[ i ] ); i++ ) {
                        (void)memberof_value_modify( op, rs,
                                    &a->a_nvals[ i ],
                                    mo->mo_ad_memberof,
                                    NULL, NULL,
                                    &op->o_req_dn,
                                    &op->o_req_ndn );
                  }
            }
      }

      return SLAP_CB_CONTINUE;
}

/*
 * response callback that deletes memberof values when a group is deleted.
 */
static int
memberof_res_delete( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      BerVarray   vals;
      int         i;

      vals = memberof_saved_member_get( op, &saved_member_vals );
      if ( vals != NULL ) {
            for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                  (void)memberof_value_modify( op, rs,
                              &vals[ i ], mo->mo_ad_memberof,
                              &op->o_req_dn, &op->o_req_ndn,
                              NULL, NULL );
            }

            memberof_saved_member_set( op, &saved_memberof_vals, NULL );
            ber_bvarray_free( vals );
      }

      if ( MEMBEROF_REFINT( mo ) ) {
            vals = memberof_saved_member_get( op, &saved_memberof_vals );
            if ( vals != NULL ) {
                  for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                        (void)memberof_value_modify( op, rs,
                                    &vals[ i ], mo->mo_ad_member,
                                    &op->o_req_dn, &op->o_req_ndn,
                                    NULL, NULL );
                  }

                  memberof_saved_member_set( op, &saved_member_vals, NULL );
                  ber_bvarray_free( vals );
            }
      }

      return SLAP_CB_CONTINUE;
}

/*
 * response callback that adds/deletes memberof values when a group
 * is modified.
 */
static int
memberof_res_modify( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      int         i, rc;
      Modifications     *ml, *mml = NULL;
      BerVarray   vals;
      memberof_is_t     iswhat = MEMBEROF_IS_GROUP;

      if ( MEMBEROF_REVERSE( mo ) ) {
            for ( ml = op->orm_modlist; ml; ml = ml->sml_next ) {
                  if ( ml->sml_desc == mo->mo_ad_memberof ) {
                        mml = ml;
                        break;
                  }
            }
      }

      if ( mml != NULL ) {
            BerVarray   vals = mml->sml_nvalues;

            switch ( mml->sml_op ) {
            case LDAP_MOD_DELETE:
                  if ( vals != NULL ) {
                        for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                              memberof_value_modify( op, rs,
                                          &vals[ i ], mo->mo_ad_member,
                                          &op->o_req_dn, &op->o_req_ndn,
                                          NULL, NULL );
                        }
                        break;
                  }
                  /* fall thru */

            case LDAP_MOD_REPLACE:
                  /* delete all ... */
                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
                  rc = backend_attribute( op, NULL, &op->o_req_ndn,
                              mo->mo_ad_memberof, &vals, ACL_READ );
                  op->o_bd->bd_info = (BackendInfo *)on;
                  if ( rc == LDAP_SUCCESS ) {
                        for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                              (void)memberof_value_modify( op, rs,
                                          &vals[ i ], mo->mo_ad_member,
                                          &op->o_req_dn, &op->o_req_ndn,
                                          NULL, NULL );
                        }
                        ber_bvarray_free_x( vals, op->o_tmpmemctx );
                  }

                  if ( ml->sml_op == LDAP_MOD_DELETE ) {
                        break;
                  }
                  /* fall thru */

            case LDAP_MOD_ADD:
                  assert( vals != NULL );

                  for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                        memberof_value_modify( op, rs,
                                    &vals[ i ], mo->mo_ad_member,
                                    NULL, NULL,
                                    &op->o_req_dn, &op->o_req_ndn );
                  }
                  break;

            default:
                  assert( 0 );
            }
      }

      if ( memberof_isGroupOrMember( op, &iswhat ) == LDAP_SUCCESS
                  && ( iswhat & MEMBEROF_IS_GROUP ) )
      {
            for ( ml = op->orm_modlist; ml; ml = ml->sml_next ) {
                  if ( ml->sml_desc != mo->mo_ad_member ) {
                        continue;
                  }

                  switch ( ml->sml_op ) {
                  case LDAP_MOD_DELETE:
                        vals = ml->sml_nvalues;
                        if ( vals != NULL ) {
                              for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                                    memberof_value_modify( op, rs,
                                                &vals[ i ], mo->mo_ad_memberof,
                                                &op->o_req_dn, &op->o_req_ndn,
                                                NULL, NULL );
                              }
                              break;
                        }
                        /* fall thru */
      
                  case LDAP_MOD_REPLACE:
                        vals = memberof_saved_member_get( op, &saved_member_vals );

                        /* delete all ... */
                        if ( vals != NULL ) {
                              for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                                    (void)memberof_value_modify( op, rs,
                                                &vals[ i ], mo->mo_ad_memberof,
                                                &op->o_req_dn, &op->o_req_ndn,
                                                NULL, NULL );
                              }
                              ber_bvarray_free_x( vals, op->o_tmpmemctx );
                        }
      
                        if ( ml->sml_op == LDAP_MOD_DELETE ) {
                              break;
                        }
                        /* fall thru */
      
                  case LDAP_MOD_ADD:
                        assert( ml->sml_nvalues != NULL );
                        vals = ml->sml_nvalues;
                        for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                              memberof_value_modify( op, rs,
                                          &vals[ i ], mo->mo_ad_memberof,
                                          NULL, NULL,
                                          &op->o_req_dn, &op->o_req_ndn );
                        }
                        break;
      
                  default:
                        assert( 0 );
                  }
            }
      }

      return SLAP_CB_CONTINUE;
}

/*
 * response callback that adds/deletes member values when a group member
 * is modified.
 */
static int
memberof_res_rename( Operation *op, SlapReply *rs )
{
      slap_overinst     *on = (slap_overinst *)op->o_bd->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      struct berval     newPDN, newDN = BER_BVNULL, newPNDN, newNDN;
      int         i, rc;
      BerVarray   vals;

      struct berval     save_dn, save_ndn;
      memberof_is_t     iswhat = MEMBEROF_IS_GROUP;

      if ( MEMBEROF_REFINT( mo ) ) {
            iswhat |= MEMBEROF_IS_MEMBER;
      }

      if ( op->orr_nnewSup ) {
            newPNDN = *op->orr_nnewSup;

      } else {
            dnParent( &op->o_req_ndn, &newPNDN );
      }

      build_new_dn( &newNDN, &newPNDN, &op->orr_nnewrdn, op->o_tmpmemctx ); 

      save_dn = op->o_req_dn;
      save_ndn = op->o_req_ndn;

      op->o_req_dn = newNDN;
      op->o_req_ndn = newNDN;
      rc = memberof_isGroupOrMember( op, &iswhat );
      op->o_req_dn = save_dn;
      op->o_req_ndn = save_ndn;

      if ( rc != LDAP_SUCCESS || iswhat == MEMBEROF_IS_NONE ) {
            goto done;
      }

      if ( op->orr_newSup ) {
            newPDN = *op->orr_newSup;

      } else {
            dnParent( &op->o_req_dn, &newPDN );
      }

      build_new_dn( &newDN, &newPDN, &op->orr_newrdn, op->o_tmpmemctx ); 

      if ( iswhat & MEMBEROF_IS_GROUP ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            rc = backend_attribute( op, NULL, &newNDN,
                        mo->mo_ad_member, &vals, ACL_READ );
            op->o_bd->bd_info = (BackendInfo *)on;

            if ( rc == LDAP_SUCCESS ) {
                  for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                        (void)memberof_value_modify( op, rs,
                                    &vals[ i ], mo->mo_ad_memberof,
                                    &op->o_req_dn, &op->o_req_ndn,
                                    &newDN, &newNDN );
                  }
                  ber_bvarray_free_x( vals, op->o_tmpmemctx );
            }
      }

      if ( MEMBEROF_REFINT( mo ) && ( iswhat & MEMBEROF_IS_MEMBER ) ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            rc = backend_attribute( op, NULL, &newNDN,
                        mo->mo_ad_memberof, &vals, ACL_READ );
            op->o_bd->bd_info = (BackendInfo *)on;

            if ( rc == LDAP_SUCCESS ) {
                  for ( i = 0; !BER_BVISNULL( &vals[ i ] ); i++ ) {
                        (void)memberof_value_modify( op, rs,
                                    &vals[ i ], mo->mo_ad_member,
                                    &op->o_req_dn, &op->o_req_ndn,
                                    &newDN, &newNDN );
                  }
                  ber_bvarray_free_x( vals, op->o_tmpmemctx );
            }
      }

done:;
      if ( !BER_BVISNULL( &newDN ) ) {
            op->o_tmpfree( newDN.bv_val, op->o_tmpmemctx );
      }
      op->o_tmpfree( newNDN.bv_val, op->o_tmpmemctx );

      return SLAP_CB_CONTINUE;
}

static int
memberof_response( Operation *op, SlapReply *rs )
{
      if ( rs->sr_err != LDAP_SUCCESS ) {
            return SLAP_CB_CONTINUE;
      }

      switch ( op->o_tag ) {
      case LDAP_REQ_ADD:
            return memberof_res_add( op, rs );

      case LDAP_REQ_DELETE:
            return memberof_res_delete( op, rs );

      case LDAP_REQ_MODIFY:
            return memberof_res_modify( op, rs );

      case LDAP_REQ_MODDN:
            return memberof_res_rename( op, rs );

      default:
            return SLAP_CB_CONTINUE;
      }
}

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

      mo = (memberof_t *)ch_calloc( 1, sizeof( memberof_t ) );

      /* safe default */
      mo->mo_dangling_err = LDAP_CONSTRAINT_VIOLATION;

      on->on_bi.bi_private = (void *)mo;

      return 0;
}

enum {
      MO_DN = 1,
      MO_DANGLING,
      MO_REFINT,
      MO_GROUP_OC,
      MO_MEMBER_AD,
      MO_MEMBER_OF_AD,
#if 0
      MO_REVERSE,
#endif

      MO_DANGLING_ERROR,

      MO_LAST
};

static ConfigDriver mo_cf_gen;

#define OID       "1.3.6.1.4.1.7136.2.666.4"
#define     OIDAT       OID ".1.1"
#define     OIDCFGAT    OID ".1.2"
#define     OIDOC       OID ".2.1"
#define     OIDCFGOC    OID ".2.2"


static ConfigTable mo_cfg[] = {
      { "memberof-dn", "modifiersName",
            2, 2, 0, ARG_MAGIC|ARG_DN|MO_DN, mo_cf_gen,
            "( OLcfgOvAt:18.0 NAME 'olcMemberOfDN' "
                  "DESC 'DN to be used as modifiersName' "
                  "SYNTAX OMsDN SINGLE-VALUE )",
            NULL, NULL },

      { "memberof-dangling", "ignore|drop|error",
            2, 2, 0, ARG_MAGIC|MO_DANGLING, mo_cf_gen,
            "( OLcfgOvAt:18.1 NAME 'olcMemberOfDangling' "
                  "DESC 'Behavior with respect to dangling members, "
                        "constrained to ignore, drop, error' "
                  "SYNTAX OMsDirectoryString SINGLE-VALUE )",
            NULL, NULL },

      { "memberof-refint", "true|FALSE",
            2, 2, 0, ARG_MAGIC|ARG_ON_OFF|MO_REFINT, mo_cf_gen,
            "( OLcfgOvAt:18.2 NAME 'olcMemberOfRefInt' "
                  "DESC 'Take care of referential integrity' "
                  "SYNTAX OMsBoolean SINGLE-VALUE )",
            NULL, NULL },

      { "memberof-group-oc", "objectClass",
            2, 2, 0, ARG_MAGIC|MO_GROUP_OC, mo_cf_gen,
            "( OLcfgOvAt:18.3 NAME 'olcMemberOfGroupOC' "
                  "DESC 'Group objectClass' "
                  "SYNTAX OMsDirectoryString SINGLE-VALUE )",
            NULL, NULL },

      { "memberof-member-ad", "member attribute",
            2, 2, 0, ARG_MAGIC|MO_MEMBER_AD, mo_cf_gen,
            "( OLcfgOvAt:18.4 NAME 'olcMemberOfMemberAD' "
                  "DESC 'member attribute' "
                  "SYNTAX OMsDirectoryString SINGLE-VALUE )",
            NULL, NULL },

      { "memberof-memberof-ad", "memberOf attribute",
            2, 2, 0, ARG_MAGIC|MO_MEMBER_OF_AD, mo_cf_gen,
            "( OLcfgOvAt:18.5 NAME 'olcMemberOfMemberOfAD' "
                  "DESC 'memberOf attribute' "
                  "SYNTAX OMsDirectoryString SINGLE-VALUE )",
            NULL, NULL },

#if 0
      { "memberof-reverse", "true|FALSE",
            2, 2, 0, ARG_MAGIC|ARG_ON_OFF|MO_REVERSE, mo_cf_gen,
            "( OLcfgOvAt:18.6 NAME 'olcMemberOfReverse' "
                  "DESC 'Take care of referential integrity "
                        "also when directly modifying memberOf' "
                  "SYNTAX OMsBoolean SINGLE-VALUE )",
            NULL, NULL },
#endif

      { "memberof-dangling-error", "error code",
            2, 2, 0, ARG_MAGIC|MO_DANGLING_ERROR, mo_cf_gen,
            "( OLcfgOvAt:18.7 NAME 'olcMemberOfDanglingError' "
                  "DESC 'Error code returned in case of dangling back reference' "
                  "SYNTAX OMsDirectoryString SINGLE-VALUE )",
            NULL, NULL },

      { NULL, NULL, 0, 0, 0, ARG_IGNORED }
};

static ConfigOCs mo_ocs[] = {
      { "( OLcfgOvOc:18.1 "
            "NAME 'olcMemberOf' "
            "DESC 'Member-of configuration' "
            "SUP olcOverlayConfig "
            "MAY ( "
                  "olcMemberOfDN "
                  "$ olcMemberOfDangling "
                  "$ olcMemberOfDanglingError"
                  "$ olcMemberOfRefInt "
                  "$ olcMemberOfGroupOC "
                  "$ olcMemberOfMemberAD "
                  "$ olcMemberOfMemberOfAD "
#if 0
                  "$ olcMemberOfReverse "
#endif
                  ") "
            ")",
            Cft_Overlay, mo_cfg, NULL, NULL },
      { NULL, 0, NULL }
};

static slap_verbmasks dangling_mode[] = {
      { BER_BVC( "ignore" ),        MEMBEROF_NONE },
      { BER_BVC( "drop" ),          MEMBEROF_FDANGLING_DROP },
      { BER_BVC( "error" ),         MEMBEROF_FDANGLING_ERROR },
      { BER_BVNULL,                 0 }
};

static int
memberof_make_group_filter( memberof_t *mo )
{
      char        *ptr;

      if ( !BER_BVISNULL( &mo->mo_groupFilterstr ) ) {
            ch_free( mo->mo_groupFilterstr.bv_val );
      }

      mo->mo_groupFilter.f_choice = LDAP_FILTER_EQUALITY;
      mo->mo_groupFilter.f_ava = &mo->mo_groupAVA;
      
      mo->mo_groupFilter.f_av_desc = slap_schema.si_ad_objectClass;
      mo->mo_groupFilter.f_av_value = mo->mo_oc_group->soc_cname;

      mo->mo_groupFilterstr.bv_len = STRLENOF( "(=)" )
            + slap_schema.si_ad_objectClass->ad_cname.bv_len
            + mo->mo_oc_group->soc_cname.bv_len;
      ptr = mo->mo_groupFilterstr.bv_val = ch_malloc( mo->mo_groupFilterstr.bv_len + 1 );
      *ptr++ = '(';
      ptr = lutil_strcopy( ptr, slap_schema.si_ad_objectClass->ad_cname.bv_val );
      *ptr++ = '=';
      ptr = lutil_strcopy( ptr, mo->mo_oc_group->soc_cname.bv_val );
      *ptr++ = ')';
      *ptr = '\0';

      return 0;
}

static int
memberof_make_member_filter( memberof_t *mo )
{
      char        *ptr;

      if ( !BER_BVISNULL( &mo->mo_memberFilterstr ) ) {
            ch_free( mo->mo_memberFilterstr.bv_val );
      }

      mo->mo_memberFilter.f_choice = LDAP_FILTER_PRESENT;
      mo->mo_memberFilter.f_desc = mo->mo_ad_memberof;

      mo->mo_memberFilterstr.bv_len = STRLENOF( "(=*)" )
            + mo->mo_ad_memberof->ad_cname.bv_len;
      ptr = mo->mo_memberFilterstr.bv_val = ch_malloc( mo->mo_memberFilterstr.bv_len + 1 );
      *ptr++ = '(';
      ptr = lutil_strcopy( ptr, mo->mo_ad_memberof->ad_cname.bv_val );
      ptr = lutil_strcopy( ptr, "=*)" );

      return 0;
}

static int
mo_cf_gen( ConfigArgs *c )
{
      slap_overinst     *on = (slap_overinst *)c->bi;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      int         i, rc = 0;

      if ( c->op == SLAP_CONFIG_EMIT ) {
            struct berval bv = BER_BVNULL;

            switch( c->type ) {
            case MO_DN:
                  if ( mo->mo_dn.bv_val != NULL) {
                        value_add_one( &c->rvalue_vals, &mo->mo_dn );
                        value_add_one( &c->rvalue_nvals, &mo->mo_ndn );
                  }
                  break;

            case MO_DANGLING:
                  enum_to_verb( dangling_mode, (mo->mo_flags & MEMBEROF_FDANGLING_MASK), &bv );
                  if ( BER_BVISNULL( &bv ) ) {
                        /* there's something wrong... */
                        assert( 0 );
                        rc = 1;

                  } else {
                        value_add_one( &c->rvalue_vals, &bv );
                  }
                  break;

            case MO_DANGLING_ERROR:
                  if ( mo->mo_flags & MEMBEROF_FDANGLING_ERROR ) {
                        char buf[ SLAP_TEXT_BUFLEN ];
                        enum_to_verb( slap_ldap_response_code, mo->mo_dangling_err, &bv );
                        if ( BER_BVISNULL( &bv ) ) {
                              bv.bv_len = snprintf( buf, sizeof( buf ), "0x%x", mo->mo_dangling_err );
                              if ( bv.bv_len < sizeof( buf ) ) {
                                    bv.bv_val = buf;
                              } else {
                                    rc = 1;
                                    break;
                              }
                        }
                        value_add_one( &c->rvalue_vals, &bv );
                  } else {
                        rc = 1;
                  }
                  break;

            case MO_REFINT:
                  c->value_int = MEMBEROF_REFINT( mo );
                  break;

#if 0
            case MO_REVERSE:
                  c->value_int = MEMBEROF_REVERSE( mo );
                  break;
#endif

            case MO_GROUP_OC:
                  if ( mo->mo_oc_group != NULL ){
                        value_add_one( &c->rvalue_vals, &mo->mo_oc_group->soc_cname );
                  }
                  break;

            case MO_MEMBER_AD:
                  if ( mo->mo_ad_member != NULL ){
                        value_add_one( &c->rvalue_vals, &mo->mo_ad_member->ad_cname );
                  }
                  break;

            case MO_MEMBER_OF_AD:
                  if ( mo->mo_ad_memberof != NULL ){
                        value_add_one( &c->rvalue_vals, &mo->mo_ad_memberof->ad_cname );
                  }
                  break;

            default:
                  assert( 0 );
                  return 1;
            }

            return rc;

      } else if ( c->op == LDAP_MOD_DELETE ) {
            return 1;   /* FIXME */

      } else {
            switch( c->type ) {
            case MO_DN:
                  if ( !BER_BVISNULL( &mo->mo_dn ) ) {
                        ber_memfree( mo->mo_dn.bv_val );
                        ber_memfree( mo->mo_ndn.bv_val );
                  }
                  mo->mo_dn = c->value_dn;
                  mo->mo_ndn = c->value_ndn;
                  break;

            case MO_DANGLING:
                  i = verb_to_mask( c->argv[ 1 ], dangling_mode );
                  if ( BER_BVISNULL( &dangling_mode[ i ].word ) ) {
                        return 1;
                  }

                  mo->mo_flags &= ~MEMBEROF_FDANGLING_MASK;
                  mo->mo_flags |= dangling_mode[ i ].mask;
                  break;

            case MO_DANGLING_ERROR:
                  i = verb_to_mask( c->argv[ 1 ], slap_ldap_response_code );
                  if ( !BER_BVISNULL( &slap_ldap_response_code[ i ].word ) ) {
                        mo->mo_dangling_err = slap_ldap_response_code[ i ].mask;
                  } else if ( lutil_atoix( &mo->mo_dangling_err, c->argv[ 1 ], 0 ) ) {
                        return 1;
                  }
                  break;

            case MO_REFINT:
                  if ( c->value_int ) {
                        mo->mo_flags |= MEMBEROF_FREFINT;

                  } else {
                        mo->mo_flags &= ~MEMBEROF_FREFINT;
                  }
                  break;

#if 0
            case MO_REVERSE:
                  if ( c->value_int ) {
                        mo->mo_flags |= MEMBEROF_FREVERSE;

                  } else {
                        mo->mo_flags &= ~MEMBEROF_FREVERSE;
                  }
                  break;
#endif

            case MO_GROUP_OC: {
                  ObjectClass *oc = NULL;

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

                  mo->mo_oc_group = oc;
                  memberof_make_group_filter( mo );
                  } break;

            case MO_MEMBER_AD: {
                  AttributeDescription    *ad = NULL;
                  const char        *text = NULL;


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

                  if ( !is_at_syntax( ad->ad_type, SLAPD_DN_SYNTAX )          /* e.g. "member" */
                        && !is_at_syntax( ad->ad_type, SLAPD_NAMEUID_SYNTAX ) )     /* e.g. "uniqueMember" */
                  {
                        snprintf( c->cr_msg, sizeof( c->cr_msg ),
                              "member attribute=\"%s\" must either "
                              "have DN (%s) or nameUID (%s) syntax",
                              c->argv[ 1 ], SLAPD_DN_SYNTAX, SLAPD_NAMEUID_SYNTAX );
                        Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n",
                              c->log, c->cr_msg, 0 );
                        return 1;
                  }

                  mo->mo_ad_member = ad;
                  } break;

            case MO_MEMBER_OF_AD: {
                  AttributeDescription    *ad = NULL;
                  const char        *text = NULL;


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

                  if ( !is_at_syntax( ad->ad_type, SLAPD_DN_SYNTAX )          /* e.g. "member" */
                        && !is_at_syntax( ad->ad_type, SLAPD_NAMEUID_SYNTAX ) )     /* e.g. "uniqueMember" */
                  {
                        snprintf( c->cr_msg, sizeof( c->cr_msg ),
                              "memberof attribute=\"%s\" must either "
                              "have DN (%s) or nameUID (%s) syntax",
                              c->argv[ 1 ], SLAPD_DN_SYNTAX, SLAPD_NAMEUID_SYNTAX );
                        Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n",
                              c->log, c->cr_msg, 0 );
                        return 1;
                  }

                  mo->mo_ad_memberof = ad;
                  memberof_make_member_filter( mo );
                  } break;

            default:
                  assert( 0 );
                  return 1;
            }
      }

      return 0;
}

static int
memberof_db_open(
      BackendDB   *be,
      ConfigReply *cr )
{
      slap_overinst     *on = (slap_overinst *)be->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;
      
      int         rc;
      const char  *text = NULL;

      if( ! mo->mo_ad_memberof ){
            rc = slap_str2ad( SLAPD_MEMBEROF_ATTR, &mo->mo_ad_memberof, &text );
            if ( rc != LDAP_SUCCESS ) {
                  Debug( LDAP_DEBUG_ANY, "memberof_db_open: "
                              "unable to find attribute=\"%s\": %s (%d)\n",
                              SLAPD_MEMBEROF_ATTR, text, rc );
                  return rc;
            }
      }

      if( ! mo->mo_ad_member ){
            rc = slap_str2ad( SLAPD_GROUP_ATTR, &mo->mo_ad_member, &text );
            if ( rc != LDAP_SUCCESS ) {
                  Debug( LDAP_DEBUG_ANY, "memberof_db_open: "
                              "unable to find attribute=\"%s\": %s (%d)\n",
                              SLAPD_GROUP_ATTR, text, rc );
                  return rc;
            }
      }

      if( ! mo->mo_oc_group ){
            mo->mo_oc_group = oc_find( SLAPD_GROUP_CLASS );
            if ( mo->mo_oc_group == NULL ) {
                  Debug( LDAP_DEBUG_ANY,
                              "memberof_db_open: "
                              "unable to find objectClass=\"%s\"\n",
                              SLAPD_GROUP_CLASS, 0, 0 );
                  return 1;
            }
      }

      if ( BER_BVISNULL( &mo->mo_dn ) && !BER_BVISNULL( &be->be_rootdn ) ) {
            ber_dupbv( &mo->mo_dn, &be->be_rootdn );
            ber_dupbv( &mo->mo_ndn, &be->be_rootndn );
      }

      if ( BER_BVISNULL( &mo->mo_groupFilterstr ) ) {
            memberof_make_group_filter( mo );
      }

      if ( BER_BVISNULL( &mo->mo_memberFilterstr ) ) {
            memberof_make_member_filter( mo );
      }

      return 0;
}

static int
memberof_db_destroy(
      BackendDB   *be,
      ConfigReply *cr )
{
      slap_overinst     *on = (slap_overinst *)be->bd_info;
      memberof_t  *mo = (memberof_t *)on->on_bi.bi_private;

      if ( mo ) {
            if ( !BER_BVISNULL( &mo->mo_dn ) ) {
                  ber_memfree( mo->mo_dn.bv_val );
                  ber_memfree( mo->mo_ndn.bv_val );
            }

            if ( !BER_BVISNULL( &mo->mo_groupFilterstr ) ) {
                  ber_memfree( mo->mo_groupFilterstr.bv_val );
            }

            if ( !BER_BVISNULL( &mo->mo_memberFilterstr ) ) {
                  ber_memfree( mo->mo_memberFilterstr.bv_val );
            }

            ber_memfree( mo );
      }

      return 0;
}

/* unused */
static AttributeDescription   *ad_memberOf;

static struct {
      char  *desc;
      AttributeDescription **adp;
} as[] = {
      { "( 1.2.840.113556.1.2.102 "
            "NAME 'memberOf' "
            "DESC 'Group that the entry belongs to' "
            "SYNTAX '1.3.6.1.4.1.1466.115.121.1.12' "
            "EQUALITY distinguishedNameMatch "  /* added */
            "USAGE dSAOperation "               /* added; questioned */
            /* "NO-USER-MODIFICATION " */       /* add? */
            "X-ORIGIN 'iPlanet Delegated Administrator' )",
            &ad_memberOf },
      { NULL }
};

#if SLAPD_OVER_MEMBEROF == SLAPD_MOD_DYNAMIC
static
#endif /* SLAPD_OVER_MEMBEROF == SLAPD_MOD_DYNAMIC */
int
memberof_initialize( void )
{
      int               code, i;

      for ( i = 0; as[ i ].desc != NULL; i++ ) {
            code = register_at( as[ i ].desc, as[ i ].adp, 0 );
            if ( code ) {
                  Debug( LDAP_DEBUG_ANY,
                        "memberof_initialize: register_at #%d failed\n",
                        i, 0, 0 );
                  return code;
            }
      }

      memberof.on_bi.bi_type = "memberof";

      memberof.on_bi.bi_db_init = memberof_db_init;
      memberof.on_bi.bi_db_open = memberof_db_open;
      memberof.on_bi.bi_db_destroy = memberof_db_destroy;

      memberof.on_bi.bi_op_add = memberof_op_add;
      memberof.on_bi.bi_op_delete = memberof_op_delete;
      memberof.on_bi.bi_op_modify = memberof_op_modify;

      memberof.on_response = memberof_response;

      memberof.on_bi.bi_cf_ocs = mo_ocs;

      code = config_register_schema( mo_cfg, mo_ocs );
      if ( code ) return code;

      return overlay_register( &memberof );
}

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

#endif /* SLAPD_OVER_MEMBEROF */

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