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rwm.c

/* rwm.c - rewrite/remap operations */
/* $OpenLDAP: pkg/ldap/servers/slapd/overlays/rwm.c,v 1.70.2.10 2008/02/15 18:11:46 quanah Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2003-2008 The OpenLDAP Foundation.
 * Portions Copyright 2003 Pierangelo Masarati.
 * 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>.
 */

#include "portable.h"

#ifdef SLAPD_OVER_RWM

#include <stdio.h>

#include <ac/string.h>

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

typedef struct rwm_op_state {
      ber_tag_t r_tag;
      struct berval ro_dn;
      struct berval ro_ndn;
      struct berval r_dn;
      struct berval r_ndn;
      AttributeName *mapped_attrs;
      OpRequest o_request;
} rwm_op_state;

static int
rwm_db_destroy( BackendDB *be, ConfigReply *cr );

typedef struct rwm_op_cb {
      slap_callback cb;
      rwm_op_state ros;
} rwm_op_cb;

static int
rwm_op_cleanup( Operation *op, SlapReply *rs )
{
      slap_callback     *cb = op->o_callback;
      rwm_op_state *ros = cb->sc_private;

      if ( rs->sr_type == REP_RESULT || rs->sr_type == REP_EXTENDED ||
            op->o_abandon || rs->sr_err == SLAPD_ABANDON ) {

            op->o_req_dn = ros->ro_dn;
            op->o_req_ndn = ros->ro_ndn;

            if ( !BER_BVISNULL( &ros->r_dn )
                  && ros->r_dn.bv_val != ros->r_ndn.bv_val )
            {
                  ch_free( ros->r_dn.bv_val );
                  BER_BVZERO( &ros->r_dn );
            }

            if ( !BER_BVISNULL( &ros->r_ndn ) ) {
                  ch_free( ros->r_ndn.bv_val );
                  BER_BVZERO( &ros->r_ndn );
            }

            switch( ros->r_tag ) {
            case LDAP_REQ_COMPARE:
                  if ( op->orc_ava->aa_value.bv_val != ros->orc_ava->aa_value.bv_val )
                        op->o_tmpfree( op->orc_ava->aa_value.bv_val, op->o_tmpmemctx );
                  op->orc_ava = ros->orc_ava;
                  break;
            case LDAP_REQ_MODIFY:
                  slap_mods_free( op->orm_modlist, 1 );
                  op->orm_modlist = ros->orm_modlist;
                  break;
            case LDAP_REQ_MODRDN:
                  if ( op->orr_newSup != ros->orr_newSup ) {
                        ch_free( op->orr_newSup->bv_val );
                        ch_free( op->orr_nnewSup->bv_val );
                        op->o_tmpfree( op->orr_newSup, op->o_tmpmemctx );
                        op->o_tmpfree( op->orr_nnewSup, op->o_tmpmemctx );
                        op->orr_newSup = ros->orr_newSup;
                        op->orr_nnewSup = ros->orr_nnewSup;
                  }
                  break;
            case LDAP_REQ_SEARCH:
                  ch_free( ros->mapped_attrs );
                  filter_free_x( op, op->ors_filter );
                  ch_free( op->ors_filterstr.bv_val );
                  op->ors_attrs = ros->ors_attrs;
                  op->ors_filter = ros->ors_filter;
                  op->ors_filterstr = ros->ors_filterstr;
                  break;
            case LDAP_REQ_EXTENDED:
                  if ( op->ore_reqdata != ros->ore_reqdata ) {
                        ber_bvfree( op->ore_reqdata );
                        op->ore_reqdata = ros->ore_reqdata;
                  }
                  break;
            default:    break;
            }
            op->o_callback = op->o_callback->sc_next;
            op->o_tmpfree( cb, op->o_tmpmemctx );
      }

      return SLAP_CB_CONTINUE;
}

static rwm_op_cb *
rwm_callback_get( Operation *op, SlapReply *rs )
{
      rwm_op_cb   *roc = NULL;

      roc = op->o_tmpalloc( sizeof( struct rwm_op_cb ), op->o_tmpmemctx );
      roc->cb.sc_cleanup = rwm_op_cleanup;
      roc->cb.sc_response = NULL;
      roc->cb.sc_next = op->o_callback;
      roc->cb.sc_private = &roc->ros;
      roc->ros.r_tag = op->o_tag;
      roc->ros.ro_dn = op->o_req_dn;
      roc->ros.ro_ndn = op->o_req_ndn;
      roc->ros.o_request = op->o_request;
      BER_BVZERO( &roc->ros.r_dn );
      BER_BVZERO( &roc->ros.r_ndn );

      return roc;
}


static int
rwm_op_dn_massage( Operation *op, SlapReply *rs, void *cookie,
      rwm_op_state *ros )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      struct berval           dn = BER_BVNULL,
                        ndn = BER_BVNULL;
      int               rc = 0;
      dncookie          dc;

      /*
       * Rewrite the dn if needed
       */
      dc.rwmap = rwmap;
      dc.conn = op->o_conn;
      dc.rs = rs;
      dc.ctx = (char *)cookie;

      /* NOTE: in those cases where only the ndn is available,
       * and the caller sets op->o_req_dn = op->o_req_ndn,
       * only rewrite the op->o_req_ndn and use it as 
       * op->o_req_dn as well */
      ndn = op->o_req_ndn;
      if ( op->o_req_dn.bv_val != op->o_req_ndn.bv_val ) {
            dn = op->o_req_dn;
            rc = rwm_dn_massage_pretty_normalize( &dc, &op->o_req_dn, &dn, &ndn );
      } else {
            rc = rwm_dn_massage_normalize( &dc, &op->o_req_ndn, &ndn );
      }

      if ( rc != LDAP_SUCCESS ) {
            return rc;
      }

      if ( ( op->o_req_dn.bv_val != op->o_req_ndn.bv_val && dn.bv_val == op->o_req_dn.bv_val )
                  || ndn.bv_val == op->o_req_ndn.bv_val )
      {
            return LDAP_SUCCESS;
      }

      if ( op->o_req_dn.bv_val != op->o_req_ndn.bv_val ) {
            op->o_req_dn = dn;
            ros->r_dn = dn;
      } else {
            op->o_req_dn = ndn;
      }
      op->o_req_ndn = ndn;
      ros->r_ndn = ndn;

      return LDAP_SUCCESS;
}

static int
rwm_op_add( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      int               rc,
                        i;
      Attribute         **ap = NULL;
      char              *olddn = op->o_req_dn.bv_val;
      int               isupdate;

      rwm_op_cb         *roc = rwm_callback_get( op, rs );

      rc = rwm_op_dn_massage( op, rs, "addDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "addDN massage error" );
            return -1;
      }

      if ( olddn != op->o_req_dn.bv_val ) {
            ber_bvreplace( &op->ora_e->e_name, &op->o_req_dn );
            ber_bvreplace( &op->ora_e->e_nname, &op->o_req_ndn );
      }

      /* Count number of attributes in entry */ 
      isupdate = be_shadow_update( op );
      for ( i = 0, ap = &op->oq_add.rs_e->e_attrs; *ap; ) {
            Attribute   *a;

            if ( (*ap)->a_desc == slap_schema.si_ad_objectClass ||
                        (*ap)->a_desc == slap_schema.si_ad_structuralObjectClass )
            {
                  int         j, last;

                  last = (*ap)->a_numvals - 1;
                  for ( j = 0; !BER_BVISNULL( &(*ap)->a_vals[ j ] ); j++ ) {
                        struct ldapmapping      *mapping = NULL;

                        ( void )rwm_mapping( &rwmap->rwm_oc, &(*ap)->a_vals[ j ],
                                    &mapping, RWM_MAP );
                        if ( mapping == NULL ) {
                              if ( rwmap->rwm_at.drop_missing ) {
                                    /* FIXME: we allow to remove objectClasses as well;
                                     * if the resulting entry is inconsistent, that's
                                     * the relayed database's business...
                                     */
                                    ch_free( (*ap)->a_vals[ j ].bv_val );
                                    if ( last > j ) {
                                          (*ap)->a_vals[ j ] = (*ap)->a_vals[ last ];
                                    }
                                    BER_BVZERO( &(*ap)->a_vals[ last ] );
                                    (*ap)->a_numvals--;
                                    last--;
                                    j--;
                              }

                        } else {
                              ch_free( (*ap)->a_vals[ j ].bv_val );
                              ber_dupbv( &(*ap)->a_vals[ j ], &mapping->m_dst );
                        }
                  }

            } else if ( !isupdate && !get_relax( op ) && (*ap)->a_desc->ad_type->sat_no_user_mod )
            {
                  goto next_attr;

            } else {
                  struct ldapmapping      *mapping = NULL;

                  ( void )rwm_mapping( &rwmap->rwm_at, &(*ap)->a_desc->ad_cname,
                              &mapping, RWM_MAP );
                  if ( mapping == NULL ) {
                        if ( rwmap->rwm_at.drop_missing ) {
                              goto cleanup_attr;
                        }
                  }

                  if ( (*ap)->a_desc->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName
                              || ( mapping != NULL && mapping->m_dst_ad->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName ) )
                  {
                        /*
                         * FIXME: rewrite could fail; in this case
                         * the operation should give up, right?
                         */
                        rc = rwm_dnattr_rewrite( op, rs, "addAttrDN",
                                    (*ap)->a_vals,
                                    (*ap)->a_nvals ? &(*ap)->a_nvals : NULL );
                        if ( rc ) {
                              goto cleanup_attr;
                        }

                  } else if ( (*ap)->a_desc == slap_schema.si_ad_ref ) {
                        rc = rwm_referral_rewrite( op, rs, "referralAttrDN",
                                    (*ap)->a_vals,
                                    (*ap)->a_nvals ? &(*ap)->a_nvals : NULL );
                        if ( rc != LDAP_SUCCESS ) {
                              goto cleanup_attr;
                        }
                  }
            
                  if ( mapping != NULL ) {
                        assert( mapping->m_dst_ad != NULL );
                        (*ap)->a_desc = mapping->m_dst_ad;
                  }
            }

next_attr:;
            ap = &(*ap)->a_next;
            continue;

cleanup_attr:;
            /* FIXME: leaking attribute/values? */
            a = *ap;

            *ap = (*ap)->a_next;
            attr_free( a );
      }

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}

static int
rwm_conn_init( BackendDB *be, Connection *conn )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      ( void )rewrite_session_init( rwmap->rwm_rw, conn );

      return SLAP_CB_CONTINUE;
}

static int
rwm_conn_destroy( BackendDB *be, Connection *conn )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      ( void )rewrite_session_delete( rwmap->rwm_rw, conn );

      return SLAP_CB_CONTINUE;
}

static int
rwm_op_bind( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      int               rc;

      rwm_op_cb         *roc = rwm_callback_get( op, rs );

      rc = rwm_op_dn_massage( op, rs, "bindDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "bindDN massage error" );
            return -1;
      }

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}

static int
rwm_op_unbind( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      rewrite_session_delete( rwmap->rwm_rw, op->o_conn );

      return SLAP_CB_CONTINUE;
}

static int
rwm_op_compare( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      int               rc;
      struct berval           mapped_vals[2] = { BER_BVNULL, BER_BVNULL };

      rwm_op_cb         *roc = rwm_callback_get( op, rs );

      rc = rwm_op_dn_massage( op, rs, "compareDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "compareDN massage error" );
            return -1;
      }

      /* if the attribute is an objectClass, try to remap its value */
      if ( op->orc_ava->aa_desc == slap_schema.si_ad_objectClass
                  || op->orc_ava->aa_desc == slap_schema.si_ad_structuralObjectClass )
      {
            rwm_map( &rwmap->rwm_oc, &op->orc_ava->aa_value,
                        &mapped_vals[0], RWM_MAP );
            if ( BER_BVISNULL( &mapped_vals[0] ) || BER_BVISEMPTY( &mapped_vals[0] ) )
            {
                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
                  send_ldap_error( op, rs, LDAP_OTHER, "compare objectClass map error" );
                  return -1;

            } else if ( mapped_vals[0].bv_val != op->orc_ava->aa_value.bv_val ) {
                  ber_dupbv_x( &op->orc_ava->aa_value, &mapped_vals[0],
                        op->o_tmpmemctx );
            }

      } else {
            struct ldapmapping      *mapping = NULL;
            AttributeDescription    *ad = op->orc_ava->aa_desc;

            ( void )rwm_mapping( &rwmap->rwm_at, &op->orc_ava->aa_desc->ad_cname,
                        &mapping, RWM_MAP );
            if ( mapping == NULL ) {
                  if ( rwmap->rwm_at.drop_missing ) {
                        op->o_bd->bd_info = (BackendInfo *)on->on_info;
                        send_ldap_error( op, rs, LDAP_OTHER, "compare attributeType map error" );
                        return -1;
                  }

            } else {
                  assert( mapping->m_dst_ad != NULL );
                  ad = mapping->m_dst_ad;
            }

            if ( op->orc_ava->aa_desc->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName
                        || ( mapping != NULL && mapping->m_dst_ad->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName ) )
            {
                  struct berval     *mapped_valsp[2];
                  
                  mapped_valsp[0] = &mapped_vals[0];
                  mapped_valsp[1] = &mapped_vals[1];

                  mapped_vals[0] = op->orc_ava->aa_value;

                  rc = rwm_dnattr_rewrite( op, rs, "compareAttrDN", NULL, mapped_valsp );

                  if ( rc != LDAP_SUCCESS ) {
                        op->o_bd->bd_info = (BackendInfo *)on->on_info;
                        send_ldap_error( op, rs, rc, "compareAttrDN massage error" );
                        return -1;
                  }

                  if ( mapped_vals[ 0 ].bv_val != op->orc_ava->aa_value.bv_val ) {
                        /* NOTE: if we get here, rwm_dnattr_rewrite()
                         * already freed the old value, so now 
                         * it's invalid */
                        ber_dupbv_x( &op->orc_ava->aa_value, &mapped_vals[0],
                              op->o_tmpmemctx );
                        ber_memfree_x( mapped_vals[ 0 ].bv_val, NULL );
                  }
            }
            op->orc_ava->aa_desc = ad;
      }

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}

static int
rwm_op_delete( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      int               rc;

      rwm_op_cb         *roc = rwm_callback_get( op, rs );

      rc = rwm_op_dn_massage( op, rs, "deleteDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "deleteDN massage error" );
            return -1;
      }

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}

static int
rwm_op_modify( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      int               isupdate;
      Modifications           **mlp;
      int               rc;

      rwm_op_cb         *roc = rwm_callback_get( op, rs );

      rc = rwm_op_dn_massage( op, rs, "modifyDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "modifyDN massage error" );
            return -1;
      }

      isupdate = be_shadow_update( op );
      for ( mlp = &op->orm_modlist; *mlp; ) {
            int               is_oc = 0;
            Modifications           *ml = *mlp;
            struct ldapmapping      *mapping = NULL;

            /* ml points to a temporary mod until needs duplication */
            if ( ml->sml_desc == slap_schema.si_ad_objectClass 
                        || ml->sml_desc == slap_schema.si_ad_structuralObjectClass )
            {
                  is_oc = 1;

            } else if ( !isupdate && !get_relax( op ) && ml->sml_desc->ad_type->sat_no_user_mod  )
            {
                  ml = ch_malloc( sizeof( Modifications ) );
                  *ml = **mlp;
                  if ( (*mlp)->sml_values ) {
                        ber_bvarray_dup_x( &ml->sml_values, (*mlp)->sml_values, NULL );
                        if ( (*mlp)->sml_nvalues ) {
                              ber_bvarray_dup_x( &ml->sml_nvalues, (*mlp)->sml_nvalues, NULL );
                        }
                  }
                  *mlp = ml;
                  goto next_mod;

            } else {
                  int               drop_missing;

                  drop_missing = rwm_mapping( &rwmap->rwm_at,
                              &ml->sml_desc->ad_cname,
                              &mapping, RWM_MAP );
                  if ( drop_missing || ( mapping != NULL && BER_BVISNULL( &mapping->m_dst ) ) )
                  {
                        goto cleanup_mod;
                  }
            }

            /* duplicate the modlist */
            ml = ch_malloc( sizeof( Modifications ));
            *ml = **mlp;
            *mlp = ml;

            if ( ml->sml_values != NULL ) {
                  int i, num;
                  struct berval *bva;

                  for ( num = 0; !BER_BVISNULL( &ml->sml_values[ num ] ); num++ )
                        /* count values */ ;

                  bva = ch_malloc( (num+1) * sizeof( struct berval ));
                  for (i=0; i<num; i++)
                        ber_dupbv( &bva[i], &ml->sml_values[i] );
                  BER_BVZERO( &bva[i] );
                  ml->sml_values = bva;

                  if ( ml->sml_nvalues ) {
                        bva = ch_malloc( (num+1) * sizeof( struct berval ));
                        for (i=0; i<num; i++)
                              ber_dupbv( &bva[i], &ml->sml_nvalues[i] );
                        BER_BVZERO( &bva[i] );
                        ml->sml_nvalues = bva;
                  }

                  if ( is_oc ) {
                        int   last, j;

                        last = num-1;

                        for ( j = 0; !BER_BVISNULL( &ml->sml_values[ j ] ); j++ ) {
                              struct ldapmapping      *oc_mapping = NULL;
            
                              ( void )rwm_mapping( &rwmap->rwm_oc, &ml->sml_values[ j ],
                                          &oc_mapping, RWM_MAP );
                              if ( oc_mapping == NULL ) {
                                    if ( rwmap->rwm_at.drop_missing ) {
                                          /* FIXME: we allow to remove objectClasses as well;
                                           * if the resulting entry is inconsistent, that's
                                           * the relayed database's business...
                                           */
                                          if ( last > j ) {
                                                ch_free( ml->sml_values[ j ].bv_val );
                                                ml->sml_values[ j ] = ml->sml_values[ last ];
                                          }
                                          BER_BVZERO( &ml->sml_values[ last ] );
                                          last--;
                                          j--;
                                    }
      
                              } else {
                                    ch_free( ml->sml_values[ j ].bv_val );
                                    ber_dupbv( &ml->sml_values[ j ], &oc_mapping->m_dst );
                              }
                        }

                  } else {
                        if ( ml->sml_desc->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName
                                    || ( mapping != NULL && mapping->m_dst_ad->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName ) )
                        {
                              rc = rwm_dnattr_rewrite( op, rs, "modifyAttrDN",
                                          ml->sml_values,
                                          ml->sml_nvalues ? &ml->sml_nvalues : NULL );

                        } else if ( ml->sml_desc == slap_schema.si_ad_ref ) {
                              rc = rwm_referral_rewrite( op, rs,
                                          "referralAttrDN",
                                          ml->sml_values,
                                          ml->sml_nvalues ? &ml->sml_nvalues : NULL );
                              if ( rc != LDAP_SUCCESS ) {
                                    goto cleanup_mod;
                              }
                        }

                        if ( rc != LDAP_SUCCESS ) {
                              goto cleanup_mod;
                        }
                  }
            }

next_mod:;
            if ( mapping != NULL ) {
                  /* use new attribute description */
                  assert( mapping->m_dst_ad != NULL );
                  ml->sml_desc = mapping->m_dst_ad;
            }

            mlp = &ml->sml_next;
            continue;

cleanup_mod:;
            ml = *mlp;
            *mlp = (*mlp)->sml_next;
            slap_mod_free( &ml->sml_mod, 0 );
            free( ml );
      }

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}

static int
rwm_op_modrdn( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;
      
      int               rc;

      rwm_op_cb         *roc = rwm_callback_get( op, rs );

      if ( op->orr_newSup ) {
            dncookie    dc;
            struct berval     nnewSup = BER_BVNULL;
            struct berval     newSup = BER_BVNULL;

            /*
             * Rewrite the new superior, if defined and required
             */
            dc.rwmap = rwmap;
            dc.conn = op->o_conn;
            dc.rs = rs;
            dc.ctx = "newSuperiorDN";
            newSup = *op->orr_newSup;
            nnewSup = *op->orr_nnewSup;
            rc = rwm_dn_massage_pretty_normalize( &dc, op->orr_newSup, &newSup, &nnewSup );
            if ( rc != LDAP_SUCCESS ) {
                  op->o_bd->bd_info = (BackendInfo *)on->on_info;
                  send_ldap_error( op, rs, rc, "newSuperiorDN massage error" );
                  return -1;
            }

            if ( op->orr_newSup->bv_val != newSup.bv_val ) {
                  op->orr_newSup = op->o_tmpalloc( sizeof( struct berval ),
                        op->o_tmpmemctx );
                  op->orr_nnewSup = op->o_tmpalloc( sizeof( struct berval ),
                        op->o_tmpmemctx );
                  *op->orr_newSup = newSup;
                  *op->orr_nnewSup = nnewSup;
            }
      }

      /*
       * Rewrite the dn, if needed
       */
      rc = rwm_op_dn_massage( op, rs, "renameDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "renameDN massage error" );
            if ( op->orr_newSup != roc->ros.orr_newSup ) {
                  ch_free( op->orr_newSup->bv_val );
                  ch_free( op->orr_nnewSup->bv_val );
                  op->o_tmpfree( op->orr_newSup, op->o_tmpmemctx );
                  op->o_tmpfree( op->orr_nnewSup, op->o_tmpmemctx );
                  op->orr_newSup = roc->ros.orr_newSup;
                  op->orr_nnewSup = roc->ros.orr_nnewSup;
            }
            return -1;
      }

      /* TODO: rewrite newRDN, attribute types, 
       * values of DN-valued attributes ... */

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}


static int
rwm_swap_attrs( Operation *op, SlapReply *rs )
{
      slap_callback     *cb = op->o_callback;
      rwm_op_state *ros = cb->sc_private;

      rs->sr_attrs = ros->ors_attrs;

      /* other overlays might have touched op->ors_attrs, 
       * so we restore the original version here, otherwise
       * attribute-mapping might fail */
      op->ors_attrs = ros->mapped_attrs; 
      
      return SLAP_CB_CONTINUE;
}

static int
rwm_op_search( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      int               rc;
      dncookie          dc;

      struct berval           fstr = BER_BVNULL;
      Filter                  *f = NULL;

      AttributeName           *an = NULL;

      char              *text = NULL;

      rwm_op_cb         *roc = rwm_callback_get( op, rs );

      rc = rewrite_session_var_set( rwmap->rwm_rw, op->o_conn,
            "searchFilter", op->ors_filterstr.bv_val );
      if ( rc == LDAP_SUCCESS )
            rc = rwm_op_dn_massage( op, rs, "searchDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            text = "searchDN massage error";
            goto error_return;
      }

      /*
       * Rewrite the dn if needed
       */
      dc.rwmap = rwmap;
      dc.conn = op->o_conn;
      dc.rs = rs;
      dc.ctx = "searchFilterAttrDN";

      rc = rwm_filter_map_rewrite( op, &dc, op->ors_filter, &fstr );
      if ( rc != LDAP_SUCCESS ) {
            text = "searchFilter/searchFilterAttrDN massage error";
            goto error_return;
      }

      f = str2filter_x( op, fstr.bv_val );

      if ( f == NULL ) {
            text = "massaged filter parse error";
            goto error_return;
      }

      op->ors_filter = f;
      op->ors_filterstr = fstr;

      rc = rwm_map_attrnames( &rwmap->rwm_at, &rwmap->rwm_oc,
                  op->ors_attrs, &an, RWM_MAP );
      if ( rc != LDAP_SUCCESS ) {
            text = "attribute list mapping error";
            goto error_return;
      }

      op->ors_attrs = an;
      /* store the mapped Attributes for later usage, in
       * the case that other overlays change op->ors_attrs */
      roc->ros.mapped_attrs = an;
      roc->cb.sc_response = rwm_swap_attrs;

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;

error_return:;
      if ( an != NULL ) {
            ch_free( an );
      }

      if ( f != NULL ) {
            filter_free_x( op, f );
      }

      if ( !BER_BVISNULL( &fstr ) ) {
            ch_free( fstr.bv_val );
      }

      op->oq_search = roc->ros.oq_search;

      op->o_bd->bd_info = (BackendInfo *)on->on_info;
      send_ldap_error( op, rs, rc, text );

      return -1;

}

static int
rwm_exop_passwd( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      int               rc;
      rwm_op_cb *roc;

      struct berval     id = BER_BVNULL,
                  pwold = BER_BVNULL,
                  pwnew = BER_BVNULL;
      BerElement *ber = NULL;

      if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
            return LDAP_SUCCESS;
      }

      if ( !SLAP_ISGLOBALOVERLAY( op->o_bd ) ) {
            rs->sr_err = LDAP_OTHER;
            return rs->sr_err;
      }

      rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
            &pwold, &pwnew, &rs->sr_text );
      if ( rs->sr_err != LDAP_SUCCESS ) {
            return rs->sr_err;
      }

      if ( !BER_BVISNULL( &id ) ) {
            char idNul = id.bv_val[id.bv_len];
            id.bv_val[id.bv_len] = '\0';
            rs->sr_err = dnPrettyNormal( NULL, &id, &op->o_req_dn,
                        &op->o_req_ndn, op->o_tmpmemctx );
            id.bv_val[id.bv_len] = idNul;
            if ( rs->sr_err != LDAP_SUCCESS ) {
                  rs->sr_text = "Invalid DN";
                  return rs->sr_err;
            }

      } else {
            ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
            ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
      }

      roc = rwm_callback_get( op, rs );

      rc = rwm_op_dn_massage( op, rs, "extendedDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "extendedDN massage error" );
            return -1;
      }

      ber = ber_alloc_t( LBER_USE_DER );
      if ( !ber ) {
            rs->sr_err = LDAP_OTHER;
            rs->sr_text = "No memory";
            return rs->sr_err;
      }
      ber_printf( ber, "{" );
      if ( !BER_BVISNULL( &id )) {
            ber_printf( ber, "tO", LDAP_TAG_EXOP_MODIFY_PASSWD_ID, 
                  &op->o_req_dn );
      }
      if ( !BER_BVISNULL( &pwold )) {
            ber_printf( ber, "tO", LDAP_TAG_EXOP_MODIFY_PASSWD_OLD, &pwold );
      }
      if ( !BER_BVISNULL( &pwnew )) {
            ber_printf( ber, "tO", LDAP_TAG_EXOP_MODIFY_PASSWD_NEW, &pwnew );
      }
      ber_printf( ber, "N}" );
      ber_flatten( ber, &op->ore_reqdata );
      ber_free( ber, 1 );

      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}

static struct exop {
      struct berval     oid;
      BI_op_extended    *extended;
} exop_table[] = {
      { BER_BVC(LDAP_EXOP_MODIFY_PASSWD), rwm_exop_passwd },
      { BER_BVNULL, NULL }
};

static int
rwm_extended( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      int               rc;
      rwm_op_cb *roc;

      int   i;

      for ( i = 0; exop_table[i].extended != NULL; i++ ) {
            if ( bvmatch( &exop_table[i].oid, &op->oq_extended.rs_reqoid ) )
            {
                  rc = exop_table[i].extended( op, rs );
                  switch ( rc ) {
                  case LDAP_SUCCESS:
                        break;

                  case SLAP_CB_CONTINUE:
                  case SLAPD_ABANDON:
                        return rc;

                  default:
                        send_ldap_result( op, rs );
                        return rc;
                  }
                  break;
            }
      }

      roc = rwm_callback_get( op, rs );

      rc = rwm_op_dn_massage( op, rs, "extendedDN", &roc->ros );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "extendedDN massage error" );
            return -1;
      }

      /* TODO: rewrite/map extended data ? ... */
      op->o_callback = &roc->cb;

      return SLAP_CB_CONTINUE;
}

static int
rwm_matched( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      struct berval           dn, mdn;
      dncookie          dc;
      int               rc;

      if ( rs->sr_matched == NULL ) {
            return SLAP_CB_CONTINUE;
      }

      dc.rwmap = rwmap;
      dc.conn = op->o_conn;
      dc.rs = rs;
      dc.ctx = "matchedDN";
      ber_str2bv( rs->sr_matched, 0, 0, &dn );
      mdn = dn;
      rc = rwm_dn_massage_pretty( &dc, &dn, &mdn );
      if ( rc != LDAP_SUCCESS ) {
            rs->sr_err = rc;
            rs->sr_text = "Rewrite error";
            return 1;
      }

      if ( mdn.bv_val != dn.bv_val ) {
            if ( rs->sr_flags & REP_MATCHED_MUSTBEFREED ) {
                  ch_free( (void *)rs->sr_matched );

            } else {
                  rs->sr_flags |= REP_MATCHED_MUSTBEFREED;
            }
            rs->sr_matched = mdn.bv_val;
      }
      
      return SLAP_CB_CONTINUE;
}

static int
rwm_attrs( Operation *op, SlapReply *rs, Attribute** a_first, int stripEntryDN )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      dncookie          dc;
      int               rc;
      Attribute         **ap;
      int               isupdate;
      int               check_duplicate_attrs = 0;

      /*
       * Rewrite the dn attrs, if needed
       */
      dc.rwmap = rwmap;
      dc.conn = op->o_conn;
      dc.rs = NULL; 

      /* FIXME: the entries are in the remote mapping form;
       * so we need to select those attributes we are willing
       * to return, and remap them accordingly */

      /* FIXME: in principle, one could map an attribute
       * on top of another, which already exists.
       * As such, in the end there might exist more than
       * one instance of an attribute.
       * We should at least check if this occurs, and issue
       * an error (because multiple instances of attrs in 
       * response are not valid), or merge the values (what
       * about duplicate values?) */
      isupdate = be_shadow_update( op );
      for ( ap = a_first; *ap; ) {
            struct ldapmapping      *mapping = NULL;
            int               drop_missing;
            int               last = -1;
            Attribute         *a;

            if ( SLAP_OPATTRS( rs->sr_attr_flags ) && is_at_operational( (*ap)->a_desc->ad_type ) )
            {
                  /* go on */ ;
                  
            } else {
                  if ( op->ors_attrs != NULL && 
                              !SLAP_USERATTRS( rs->sr_attr_flags ) &&
                              !ad_inlist( (*ap)->a_desc, op->ors_attrs ) )
                  {
                        goto cleanup_attr;
                  }

                  drop_missing = rwm_mapping( &rwmap->rwm_at,
                              &(*ap)->a_desc->ad_cname, &mapping, RWM_REMAP );
                  if ( drop_missing || ( mapping != NULL && BER_BVISEMPTY( &mapping->m_dst ) ) )
                  {
                        goto cleanup_attr;
                  }
                  if ( mapping != NULL ) {
                        assert( mapping->m_dst_ad != NULL );

                        /* try to normalize mapped Attributes if the original 
                         * AttributeType was not normalized */
                        if ((rwmap->rwm_flags & RWM_F_NORMALIZE_MAPPED_ATTRS) && 
                              (!(*ap)->a_desc->ad_type->sat_equality || 
                              !(*ap)->a_desc->ad_type->sat_equality->smr_normalize) &&
                              mapping->m_dst_ad->ad_type->sat_equality &&
                              mapping->m_dst_ad->ad_type->sat_equality->smr_normalize )
                        {
                              int i = 0;

                              last = (*ap)->a_numvals;
                              if ( last )
                              {
                                    (*ap)->a_nvals = ch_malloc( (last+1) * sizeof(struct berval) );

                                    for ( i = 0; !BER_BVISNULL( &(*ap)->a_vals[i]); i++ ) {
                                          int         rc;
                                          /*
                                           * check that each value is valid per syntax
                                           * and pretty if appropriate
                                           */
                                          rc = mapping->m_dst_ad->ad_type->sat_equality->smr_normalize(
                                                SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
                                                mapping->m_dst_ad->ad_type->sat_syntax,
                                                mapping->m_dst_ad->ad_type->sat_equality,
                                                &(*ap)->a_vals[i], &(*ap)->a_nvals[i],
                                                NULL );

                                          if ( rc != LDAP_SUCCESS ) {
                                                BER_BVZERO( &(*ap)->a_nvals[i] );
                                          }
                                    }
                                    BER_BVZERO( &(*ap)->a_nvals[i] );
                              }
                        }

                        /* rewrite the attribute description */
                        (*ap)->a_desc = mapping->m_dst_ad;

                        /* will need to check for duplicate attrs */
                        check_duplicate_attrs++;
                  }
            }

            if ( (*ap)->a_desc == slap_schema.si_ad_entryDN ) {
                  if ( stripEntryDN ) {
                        /* will be generated by frontend */
                        goto cleanup_attr;
                  }
                  
            } else if ( !isupdate
                  && !get_relax( op )
                  && (*ap)->a_desc->ad_type->sat_no_user_mod 
                  && (*ap)->a_desc->ad_type != slap_schema.si_at_undefined )
            {
                  goto next_attr;
            }

            if ( last == -1 ) { /* not yet counted */ 
                  last = (*ap)->a_numvals;
            }

            if ( last == 0 ) {
                  /* empty? leave it in place because of attrsonly and vlv */
                  goto next_attr;
            }
            last--;

            if ( (*ap)->a_desc == slap_schema.si_ad_objectClass
                        || (*ap)->a_desc == slap_schema.si_ad_structuralObjectClass )
            {
                  struct berval     *bv;
                  
                  for ( bv = (*ap)->a_vals; !BER_BVISNULL( bv ); bv++ ) {
                        struct berval     mapped;

                        rwm_map( &rwmap->rwm_oc, &bv[0], &mapped, RWM_REMAP );
                        if ( BER_BVISNULL( &mapped ) || BER_BVISEMPTY( &mapped ) ) {
remove_oc:;
                              ch_free( bv[0].bv_val );
                              BER_BVZERO( &bv[0] );
                              if ( &(*ap)->a_vals[last] > &bv[0] ) {
                                    bv[0] = (*ap)->a_vals[last];
                                    BER_BVZERO( &(*ap)->a_vals[last] );
                              }
                              last--;
                              bv--;

                        } else if ( mapped.bv_val != bv[0].bv_val ) {
                              int   i;

                              for ( i = 0; !BER_BVISNULL( &(*ap)->a_vals[ i ] ); i++ ) {
                                    if ( &(*ap)->a_vals[ i ] == bv ) {
                                          continue;
                                    }

                                    if ( ber_bvstrcasecmp( &mapped, &(*ap)->a_vals[ i ] ) == 0 ) {
                                          break;
                                    }
                              }

                              if ( !BER_BVISNULL( &(*ap)->a_vals[ i ] ) ) {
                                    goto remove_oc;
                              }

                              /*
                               * FIXME: after LBER_FREEing
                               * the value is replaced by
                               * ch_alloc'ed memory
                               */
                              ber_bvreplace( &bv[0], &mapped );

                              /* FIXME: will need to check
                               * if the structuralObjectClass
                               * changed */
                        }
                  }

            /*
             * It is necessary to try to rewrite attributes with
             * dn syntax because they might be used in ACLs as
             * members of groups; since ACLs are applied to the
             * rewritten stuff, no dn-based subject clause could
             * be used at the ldap backend side (see
             * http://www.OpenLDAP.org/faq/data/cache/452.html)
             * The problem can be overcome by moving the dn-based
             * ACLs to the target directory server, and letting
             * everything pass thru the ldap backend. */
            /* FIXME: handle distinguishedName-like syntaxes, like
             * nameAndOptionalUID */
            } else if ( (*ap)->a_desc->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName
                        || ( mapping != NULL && mapping->m_src_ad->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName ) )
            {
                  dc.ctx = "searchAttrDN";
                  rc = rwm_dnattr_result_rewrite( &dc, (*ap)->a_vals );
                  if ( rc != LDAP_SUCCESS ) {
                        goto cleanup_attr;
                  }

            } else if ( (*ap)->a_desc == slap_schema.si_ad_ref ) {
                  dc.ctx = "searchAttrDN";
                  rc = rwm_referral_result_rewrite( &dc, (*ap)->a_vals );
                  if ( rc != LDAP_SUCCESS ) {
                        goto cleanup_attr;
                  }
            }


next_attr:;
            ap = &(*ap)->a_next;
            continue;

cleanup_attr:;
            a = *ap;
            *ap = (*ap)->a_next;

            attr_free( a );
      }

      /* only check if some mapping occurred */
      if ( check_duplicate_attrs ) {
            for ( ap = a_first; *ap != NULL; ap = &(*ap)->a_next ) {
                  Attribute   **tap;

                  for ( tap = &(*ap)->a_next; *tap != NULL; ) {
                        if ( (*tap)->a_desc == (*ap)->a_desc ) {
                              Entry       e = { 0 };
                              Modification      mod = { 0 };
                              const char  *text = NULL;
                              char        textbuf[ SLAP_TEXT_BUFLEN ];
                              Attribute   *next = (*tap)->a_next;

                              BER_BVSTR( &e.e_name, "" );
                              BER_BVSTR( &e.e_nname, "" );
                              e.e_attrs = *ap;
                              mod.sm_op = LDAP_MOD_ADD;
                              mod.sm_desc = (*ap)->a_desc;
                              mod.sm_type = mod.sm_desc->ad_cname;
                              mod.sm_numvals = (*tap)->a_numvals;
                              mod.sm_values = (*tap)->a_vals;
                              if ( (*tap)->a_nvals != (*tap)->a_vals ) {
                                    mod.sm_nvalues = (*tap)->a_nvals;
                              }

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

                              /* should not insert new attrs! */
                              assert( e.e_attrs == *ap );

                              attr_free( *tap );
                              *tap = next;

                        } else {
                              tap = &(*tap)->a_next;
                        }
                  }
            }
      }

      return 0;
}

static int
rwm_send_entry( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      Entry             *e = NULL;
      slap_mask_t       flags;
      struct berval           dn = BER_BVNULL,
                        ndn = BER_BVNULL;
      dncookie          dc;
      int               rc;

      assert( rs->sr_entry != NULL );

      /*
       * Rewrite the dn of the result, if needed
       */
      dc.rwmap = rwmap;
      dc.conn = op->o_conn;
      dc.rs = NULL; 
      dc.ctx = "searchEntryDN";

      e = rs->sr_entry;
      flags = rs->sr_flags;
      if ( !( rs->sr_flags & REP_ENTRY_MODIFIABLE ) ) {
            /* FIXME: all we need to duplicate are:
             * - dn
             * - ndn
             * - attributes that are requested
             * - no values if attrsonly is set
             */

            e = entry_dup( e );
            if ( e == NULL ) {
                  rc = LDAP_NO_MEMORY;
                  goto fail;
            }

            flags &= ~REP_ENTRY_MUSTRELEASE;
            flags |= ( REP_ENTRY_MODIFIABLE | REP_ENTRY_MUSTBEFREED );
      }

      /*
       * Note: this may fail if the target host(s) schema differs
       * from the one known to the meta, and a DN with unknown
       * attributes is returned.
       */
      dn = e->e_name;
      ndn = e->e_nname;
      rc = rwm_dn_massage_pretty_normalize( &dc, &e->e_name, &dn, &ndn );
      if ( rc != LDAP_SUCCESS ) {
            rc = 1;
            goto fail;
      }

      if ( e->e_name.bv_val != dn.bv_val ) {
            ch_free( e->e_name.bv_val );
            ch_free( e->e_nname.bv_val );

            e->e_name = dn;
            e->e_nname = ndn;
      }

      /* TODO: map entry attribute types, objectclasses 
       * and dn-valued attribute values */

      /* FIXME: the entries are in the remote mapping form;
       * so we need to select those attributes we are willing
       * to return, and remap them accordingly */
      (void)rwm_attrs( op, rs, &e->e_attrs, 1 );

      if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
            be_entry_release_rw( op, rs->sr_entry, 0 );
      }

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

      return SLAP_CB_CONTINUE;

fail:;
      if ( e != NULL && e != rs->sr_entry ) {
            if ( e->e_name.bv_val == dn.bv_val ) {
                  BER_BVZERO( &e->e_name );
            }

            if ( e->e_nname.bv_val == ndn.bv_val ) {
                  BER_BVZERO( &e->e_nname );
            }

            entry_free( e );
      }

      if ( !BER_BVISNULL( &dn ) ) {
            ch_free( dn.bv_val );
      }

      if ( !BER_BVISNULL( &ndn ) ) {
            ch_free( ndn.bv_val );
      }

      return rc;
}

static int
rwm_operational( Operation *op, SlapReply *rs )
{
      /* FIXME: the entries are in the remote mapping form;
       * so we need to select those attributes we are willing
       * to return, and remap them accordingly */
      if ( rs->sr_operational_attrs ) {
            rwm_attrs( op, rs, &rs->sr_operational_attrs, 1 );
      }

      return SLAP_CB_CONTINUE;
}

#if 0
/* don't use this; it cannot be reverted, and leaves op->o_req_dn
 * rewritten for subsequent operations; fine for plain suffixmassage,
 * but destroys everything else */
static int
rwm_chk_referrals( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *) op->o_bd->bd_info;
      int               rc;

      rc = rwm_op_dn_massage( op, rs, "referralCheckDN" );
      if ( rc != LDAP_SUCCESS ) {
            op->o_bd->bd_info = (BackendInfo *)on->on_info;
            send_ldap_error( op, rs, rc, "referralCheckDN massage error" );
            return -1;
      }

      return SLAP_CB_CONTINUE;
}
#endif

static int
rwm_rw_config(
      BackendDB   *be,
      const char  *fname,
      int         lineno,
      int         argc,
      char        **argv )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      return rewrite_parse( rwmap->rwm_rw,
                        fname, lineno, argc, argv );

      return 0;
}

static int
rwm_suffixmassage_config(
      BackendDB   *be,
      const char  *fname,
      int         lineno,
      int         argc,
      char        **argv )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      struct berval           bvnc, nvnc, pvnc, brnc, nrnc, prnc;
      int               massaged;
      int               rc;
            
      /*
       * syntax:
       * 
       *    suffixmassage [<suffix>] <massaged suffix>
       *
       * the [<suffix>] field must be defined as a valid suffix
       * for the current database;
       * the <massaged suffix> shouldn't have already been
       * defined as a valid suffix for the current server
       */
      if ( argc == 2 ) {
            if ( be->be_suffix == NULL ) {
                  fprintf( stderr, "%s: line %d: "
                               " \"suffixMassage [<suffix>]"
                               " <massaged suffix>\" without "
                               "<suffix> part requires database "
                               "suffix be defined first.\n",
                        fname, lineno );
                  return 1;
            }
            bvnc = be->be_suffix[ 0 ];
            massaged = 1;

      } else if ( argc == 3 ) {
            ber_str2bv( argv[ 1 ], 0, 0, &bvnc );
            massaged = 2;

      } else  {
            fprintf( stderr, "%s: line %d: syntax is"
                         " \"suffixMassage [<suffix>]"
                         " <massaged suffix>\"\n",
                  fname, lineno );
            return 1;
      }

      if ( dnPrettyNormal( NULL, &bvnc, &pvnc, &nvnc, NULL ) != LDAP_SUCCESS ) {
            fprintf( stderr, "%s: line %d: suffix DN %s is invalid\n",
                  fname, lineno, bvnc.bv_val );
            return 1;
      }

      ber_str2bv( argv[ massaged ], 0, 0, &brnc );
      if ( dnPrettyNormal( NULL, &brnc, &prnc, &nrnc, NULL ) != LDAP_SUCCESS ) {
            fprintf( stderr, "%s: line %d: suffix DN %s is invalid\n",
                        fname, lineno, brnc.bv_val );
            free( nvnc.bv_val );
            free( pvnc.bv_val );
            return 1;
      }

      /*
       * The suffix massaging is emulated 
       * by means of the rewrite capabilities
       */
      rc = rwm_suffix_massage_config( rwmap->rwm_rw,
                  &pvnc, &nvnc, &prnc, &nrnc );
      free( nvnc.bv_val );
      free( pvnc.bv_val );
      free( nrnc.bv_val );
      free( prnc.bv_val );

      return rc;
}

static int
rwm_m_config(
      BackendDB   *be,
      const char  *fname,
      int         lineno,
      int         argc,
      char        **argv )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      /* objectclass/attribute mapping */
      return rwm_map_config( &rwmap->rwm_oc,
                  &rwmap->rwm_at,
                  fname, lineno, argc, argv );
}

static int
rwm_response( Operation *op, SlapReply *rs )
{
      slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      int         rc;

      if ( op->o_tag == LDAP_REQ_SEARCH && rs->sr_type == REP_SEARCH ) {
            return rwm_send_entry( op, rs );
      }

      switch( op->o_tag ) {
      case LDAP_REQ_SEARCH:
      case LDAP_REQ_BIND:
      case LDAP_REQ_ADD:
      case LDAP_REQ_DELETE:
      case LDAP_REQ_MODRDN:
      case LDAP_REQ_MODIFY:
      case LDAP_REQ_COMPARE:
      case LDAP_REQ_EXTENDED:
            if ( rs->sr_ref ) {
                  dncookie          dc;

                  /*
                   * Rewrite the dn of the referrals, if needed
                   */
                  dc.rwmap = rwmap;
                  dc.conn = op->o_conn;
                  dc.rs = NULL; 
                  dc.ctx = "referralDN";
                  rc = rwm_referral_result_rewrite( &dc, rs->sr_ref );
                  if ( rc != LDAP_SUCCESS ) {
                        rc = 1;
                        break;
                  }
            }
            rc = rwm_matched( op, rs );
            break;

      default:
            rc = SLAP_CB_CONTINUE;
            break;
      }

      return rc;
}

static int
rwm_db_config(
      BackendDB   *be,
      const char  *fname,
      int         lineno,
      int         argc,
      char        **argv )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      int         rc = 0;
      char        *argv0 = NULL;

      if ( strncasecmp( argv[ 0 ], "rwm-", STRLENOF( "rwm-" ) ) == 0 ) {
            argv0 = argv[ 0 ];
            argv[ 0 ] = &argv0[ STRLENOF( "rwm-" ) ];
      }

      if ( strncasecmp( argv[0], "rewrite", STRLENOF("rewrite") ) == 0 ) {
            rc = rwm_rw_config( be, fname, lineno, argc, argv );

      } else if ( strcasecmp( argv[0], "map" ) == 0 ) {
            rc = rwm_m_config( be, fname, lineno, argc, argv );

      } else if ( strcasecmp( argv[0], "suffixmassage" ) == 0 ) {
            rc = rwm_suffixmassage_config( be, fname, lineno, argc, argv );

      } else if ( strcasecmp( argv[0], "t-f-support" ) == 0 ) {
            if ( argc != 2 ) {
                  fprintf( stderr,
            "%s: line %d: \"t-f-support {no|yes|discover}\" needs 1 argument.\n",
                              fname, lineno );
                  return( 1 );
            }

            if ( strcasecmp( argv[ 1 ], "no" ) == 0 ) {
                  rwmap->rwm_flags &= ~(RWM_F_SUPPORT_T_F_MASK2);

            } else if ( strcasecmp( argv[ 1 ], "yes" ) == 0 ) {
                  rwmap->rwm_flags |= RWM_F_SUPPORT_T_F;

            /* TODO: not implemented yet */
            } else if ( strcasecmp( argv[ 1 ], "discover" ) == 0 ) {
                  fprintf( stderr,
            "%s: line %d: \"discover\" not supported yet "
            "in \"t-f-support {no|yes|discover}\".\n",
                              fname, lineno );
                  return( 1 );
#if 0
                  rwmap->rwm_flags |= RWM_F_SUPPORT_T_F_DISCOVER;
#endif

            } else {
                  fprintf( stderr,
      "%s: line %d: unknown value \"%s\" for \"t-f-support {no|yes|discover}\".\n",
                        fname, lineno, argv[ 1 ] );
                  return 1;
            }

      } else if ( strcasecmp( argv[0], "normalize-mapped-attrs" ) ==  0 ) {
            if ( argc !=2 ) { 
                  fprintf( stderr,
            "%s: line %d: \"normalize-mapped-attrs {no|yes}\" needs 1 argument.\n",
                              fname, lineno );
                  return( 1 );
            }

            if ( strcasecmp( argv[ 1 ], "no" ) == 0 ) {
                  rwmap->rwm_flags &= ~(RWM_F_NORMALIZE_MAPPED_ATTRS);

            } else if ( strcasecmp( argv[ 1 ], "yes" ) == 0 ) {
                  rwmap->rwm_flags |= RWM_F_NORMALIZE_MAPPED_ATTRS;
            }

      } else {
            rc = SLAP_CONF_UNKNOWN;
      }

      if ( argv0 ) {
            argv[ 0 ] = argv0;
      }

      return rc;
}

/*
 * dynamic configuration...
 */

enum {
      /* rewrite */
      RWM_CF_REWRITE = 1,
      RWM_CF_SUFFIXMASSAGE,

      /* map */
      RWM_CF_MAP,
      RWM_CF_T_F_SUPPORT,
      RWM_CF_NORMALIZE_MAPPED,

      RWM_CF_LAST
};

static slap_verbmasks t_f_mode[] = {
      { BER_BVC( "yes" ),           RWM_F_SUPPORT_T_F },
      { BER_BVC( "discover" ),      RWM_F_SUPPORT_T_F_DISCOVER },
      { BER_BVC( "no" ),            RWM_F_NONE },
      { BER_BVNULL,                 0 }
};

static ConfigDriver rwm_cf_gen;

static ConfigTable rwmcfg[] = {
      { "rwm-rewrite", "rewrite",
            2, 0, STRLENOF("rwm-rewrite"),
            ARG_MAGIC|ARG_QUOTE|RWM_CF_REWRITE, rwm_cf_gen,
            "( OLcfgOvAt:16.1 NAME 'olcRwmRewrite' "
                  "DESC 'Rewrites strings' "
                  "EQUALITY caseIgnoreMatch "
                  "SYNTAX OMsDirectoryString "
                  "X-ORDERED 'VALUES' )",
            NULL, NULL },

      { "rwm-suffixmassage", "[virtual]> <real",
            2, 3, 0, ARG_MAGIC|RWM_CF_SUFFIXMASSAGE, rwm_cf_gen,
            NULL, NULL, NULL },
            
      { "rwm-t-f-support", "true|false|discover",
            2, 2, 0, ARG_MAGIC|RWM_CF_T_F_SUPPORT, rwm_cf_gen,
            "( OLcfgOvAt:16.2 NAME 'olcRwmTFSupport' "
                  "DESC 'Absolute filters support' "
                  "SYNTAX OMsDirectoryString "
                  "SINGLE-VALUE )",
            NULL, NULL },

      { "rwm-map", "{objectClass|attribute}",
            2, 4, 0, ARG_MAGIC|RWM_CF_MAP, rwm_cf_gen,
            "( OLcfgOvAt:16.3 NAME 'olcRwmMap' "
                  "DESC 'maps attributes/objectClasses' "
                  "SYNTAX OMsDirectoryString "
                  "X-ORDERED 'VALUES' )",
            NULL, NULL },

      { "rwm-normalize-mapped-attrs", "true|false",
            2, 2, 0, ARG_MAGIC|ARG_ON_OFF|RWM_CF_NORMALIZE_MAPPED, rwm_cf_gen,
            "( OLcfgOvAt:16.4 NAME 'olcRwmNormalizeMapped' "
                  "DESC 'Normalize mapped attributes/objectClasses' "
                  "SYNTAX OMsBoolean "
                  "SINGLE-VALUE )",
            NULL, NULL },

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

static ConfigOCs rwmocs[] = {
      { "( OLcfgOvOc:16.1 "
            "NAME 'olcRwmConfig' "
            "DESC 'Rewrite/remap configuration' "
            "SUP olcOverlayConfig "
            "MAY ( "
                  "olcRwmRewrite $ "
                  "olcRwmTFSupport $ "
                  "olcRwmMap $ "
                  "olcRwmNormalizeMapped "
                  ") )",
            Cft_Overlay, rwmcfg, NULL, NULL },
      { NULL, 0, NULL }
};

static void
slap_rewrite_unparse( BerVarray in, BerVarray *out )
{
      int         i;
      BerVarray   bva = NULL;
      char        ibuf[32], *ptr;
      struct berval     idx;

      assert( in != NULL );

      for ( i = 0; !BER_BVISNULL( &in[i] ); i++ )
            /* count'em */ ;

      if ( i == 0 ) {
            return;
      }

      idx.bv_val = ibuf;

      bva = ch_malloc( ( i + 1 ) * sizeof(struct berval) );
      BER_BVZERO( &bva[ 0 ] );

      for ( i = 0; !BER_BVISNULL( &in[i] ); i++ ) {
            idx.bv_len = snprintf( idx.bv_val, sizeof( ibuf ), "{%d}", i );
            if ( idx.bv_len >= sizeof( ibuf ) ) {
                  ber_bvarray_free( bva );
                  return;
            }

            bva[i].bv_len = idx.bv_len + in[i].bv_len;
            bva[i].bv_val = ch_malloc( bva[i].bv_len + 1 );
            ptr = lutil_strcopy( bva[i].bv_val, ibuf );
            ptr = lutil_strcopy( ptr, in[i].bv_val );
            *ptr = '\0';
            BER_BVZERO( &bva[ i + 1 ] );
      }

      *out = bva;
}

static int
rwm_cf_gen( ConfigArgs *c )
{
      slap_overinst           *on = (slap_overinst *)c->bi;
      struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

      BackendDB         db;
      char              *argv0;
      int               rc = 0;

      db = *c->be;
      db.bd_info = c->bi;

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

            switch ( c->type ) {
            case RWM_CF_REWRITE:
                  if ( rwmap->rwm_bva_rewrite == NULL ) {
                        rc = 1;

                  } else {
                        slap_rewrite_unparse( rwmap->rwm_bva_rewrite, &c->rvalue_vals );
                        if ( !c->rvalue_vals ) {
                              rc = 1;
                        }
                  }
                  break;

            case RWM_CF_T_F_SUPPORT:
                  enum_to_verb( t_f_mode, (rwmap->rwm_flags & RWM_F_SUPPORT_T_F_MASK2), &bv );
                  if ( BER_BVISNULL( &bv ) ) {
                        /* there's something wrong... */
                        assert( 0 );
                        rc = 1;

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

            case RWM_CF_MAP:
                  if ( rwmap->rwm_bva_map == NULL ) {
                        rc = 1;

                  } else {
                        value_add( &c->rvalue_vals, rwmap->rwm_bva_map );
                  }
                  break;

            case RWM_CF_NORMALIZE_MAPPED:
                  c->value_int = ( rwmap->rwm_flags & RWM_F_NORMALIZE_MAPPED_ATTRS );
                  break;

            default:
                  assert( 0 );
                  rc = 1;
            }

            return rc;

      } else if ( c->op == LDAP_MOD_DELETE ) {
            switch ( c->type ) {
            case RWM_CF_REWRITE:
                  if ( c->valx >= 0 ) {
                        /* single modification is not allowed */
                        rc = 1;

                  } else if ( rwmap->rwm_rw != NULL ) {
                        rewrite_info_delete( &rwmap->rwm_rw );
                        assert( rwmap->rwm_rw == NULL );

                        ber_bvarray_free( rwmap->rwm_bva_rewrite );
                        rwmap->rwm_bva_rewrite = NULL;
                  }
                  break;

            case RWM_CF_T_F_SUPPORT:
                  rwmap->rwm_flags &= ~RWM_F_SUPPORT_T_F_MASK2;
                  break;

            case RWM_CF_MAP:
                  if ( c->valx >= 0 ) {
                        /* single modification is not allowed */
                        rc = 1;

                  } else {
                        avl_free( rwmap->rwm_oc.remap, rwm_mapping_dst_free );
                        avl_free( rwmap->rwm_oc.map, rwm_mapping_free );
                        avl_free( rwmap->rwm_at.remap, rwm_mapping_dst_free );
                        avl_free( rwmap->rwm_at.map, rwm_mapping_free );

                        rwmap->rwm_oc.remap = NULL;
                        rwmap->rwm_oc.map = NULL;
                        rwmap->rwm_at.remap = NULL;
                        rwmap->rwm_at.map = NULL;

                        ber_bvarray_free( rwmap->rwm_bva_map );
                        rwmap->rwm_bva_map = NULL;
                  }
                  break;

            case RWM_CF_NORMALIZE_MAPPED:
                  rwmap->rwm_flags &= ~RWM_F_NORMALIZE_MAPPED_ATTRS;
                  break;

            default:
                  return 1;
            }
            return rc;
      }

      switch ( c->type ) {
      case RWM_CF_REWRITE:
            argv0 = c->argv[ 0 ];
            c->argv[ 0 ] += STRLENOF( "rwm-" );
            rc = rwm_rw_config( &db, c->fname, c->lineno, c->argc, c->argv );
            c->argv[ 0 ] = argv0;
            if ( rc ) {
                  return 1;

            } else {
                  char        *line;
                  struct berval     bv;

                  line = ldap_charray2str( c->argv, "\" \"" );
                  if ( line != NULL ) {
                        int   len = strlen( c->argv[ 0 ] );

                        ber_str2bv( line, 0, 0, &bv );
                        AC_MEMCPY( &bv.bv_val[ len ], &bv.bv_val[ len + 1 ],
                              bv.bv_len - ( len + 1 ) );
                        bv.bv_val[ bv.bv_len - 1 ] = '"';
                        ber_bvarray_add( &rwmap->rwm_bva_rewrite, &bv );
                  }
            }
            break;

      case RWM_CF_SUFFIXMASSAGE:
            argv0 = c->argv[ 0 ];
            c->argv[ 0 ] += STRLENOF( "rwm-" );
            rc = rwm_suffixmassage_config( &db, c->fname, c->lineno, c->argc, c->argv );
            c->argv[ 0 ] = argv0;
            if ( rc ) {
                  return 1;

            } else {
                  char        *line;
                  struct berval     bv;

                  /* FIXME: not optimal; in fact, this keeps track
                   * of the fact that a set of rules was added
                   * using the rwm-suffixmassage shortcut, but the
                   * rules are not clarified */

                  line = ldap_charray2str( c->argv, "\" \"" );
                  if ( line != NULL ) {
                        int   len = strlen( c->argv[ 0 ] );

                        ber_str2bv( line, 0, 0, &bv );
                        AC_MEMCPY( &bv.bv_val[ len ], &bv.bv_val[ len + 1 ],
                              bv.bv_len - ( len + 1 ) );
                        bv.bv_val[ bv.bv_len - 1 ] = '"';
                        ber_bvarray_add( &rwmap->rwm_bva_rewrite, &bv );
                  }
            }
            break;

      case RWM_CF_T_F_SUPPORT:
            rc = verb_to_mask( c->argv[ 1 ], t_f_mode );
            if ( BER_BVISNULL( &t_f_mode[ rc ].word ) ) {
                  return 1;
            }

            rwmap->rwm_flags &= ~RWM_F_SUPPORT_T_F_MASK2;
            rwmap->rwm_flags |= t_f_mode[ rc ].mask;
            rc = 0;
            break;

      case RWM_CF_MAP:
            argv0 = c->argv[ 0 ];
            c->argv[ 0 ] += STRLENOF( "rwm-" );
            rc = rwm_m_config( &db, c->fname, c->lineno, c->argc, c->argv );
            c->argv[ 0 ] = argv0;
            if ( rc ) {
                  return 1;

            } else {
                  char        *line;
                  struct berval     bv;

                  line = ldap_charray2str( &c->argv[ 1 ], " " );
                  if ( line != NULL ) {
                        ber_str2bv( line, 0, 0, &bv );
                        ber_bvarray_add( &rwmap->rwm_bva_map, &bv );
                  }
            }
            break;

      case RWM_CF_NORMALIZE_MAPPED:
            if ( c->value_int ) {
                  rwmap->rwm_flags |= RWM_F_NORMALIZE_MAPPED_ATTRS;
            } else {
                  rwmap->rwm_flags &= ~RWM_F_NORMALIZE_MAPPED_ATTRS;
            }
            break;

      default:
            assert( 0 );
            return 1;
      }

      return rc;
}

static int
rwm_db_init(
      BackendDB   *be,
      ConfigReply *cr )
{
      slap_overinst           *on = (slap_overinst *) be->bd_info;
      struct ldaprwmap  *rwmap;
      char              *rargv[ 3 ];
      int               rc = 0;

      rwmap = (struct ldaprwmap *)ch_calloc( 1, sizeof( struct ldaprwmap ) );

      rwmap->rwm_rw = rewrite_info_init( REWRITE_MODE_USE_DEFAULT );
      if ( rwmap->rwm_rw == NULL ) {
            rc = -1;
            goto error_return;
      }

      /* this rewriteContext by default must be null;
       * rules can be added if required */
      rargv[ 0 ] = "rewriteContext";
      rargv[ 1 ] = "searchFilter";
      rargv[ 2 ] = NULL;
      rewrite_parse( rwmap->rwm_rw, "<suffix massage>", 1, 2, rargv );

      rargv[ 0 ] = "rewriteContext";
      rargv[ 1 ] = "default";
      rargv[ 2 ] = NULL;
      rewrite_parse( rwmap->rwm_rw, "<suffix massage>", 2, 2, rargv );

error_return:;
      on->on_bi.bi_private = (void *)rwmap;

      if ( rc ) {
            (void)rwm_db_destroy( be, NULL );
      }

      return rc;
}

static int
rwm_db_destroy(
      BackendDB   *be,
      ConfigReply *cr )
{
      slap_overinst     *on = (slap_overinst *) be->bd_info;
      int         rc = 0;

      if ( on->on_bi.bi_private ) {
            struct ldaprwmap  *rwmap = 
                  (struct ldaprwmap *)on->on_bi.bi_private;

            if ( rwmap->rwm_rw ) {
                  rewrite_info_delete( &rwmap->rwm_rw );
                  ber_bvarray_free( rwmap->rwm_bva_rewrite );
            }

            avl_free( rwmap->rwm_oc.remap, rwm_mapping_dst_free );
            avl_free( rwmap->rwm_oc.map, rwm_mapping_free );
            avl_free( rwmap->rwm_at.remap, rwm_mapping_dst_free );
            avl_free( rwmap->rwm_at.map, rwm_mapping_free );
            ber_bvarray_free( rwmap->rwm_bva_map );

            ch_free( rwmap );
      }

      return rc;
}

static slap_overinst rwm = { { NULL } };

#if SLAPD_OVER_RWM == SLAPD_MOD_DYNAMIC
static
#endif /* SLAPD_OVER_RWM == SLAPD_MOD_DYNAMIC */
int
rwm_initialize( void )
{
      int         rc;

      /* Make sure we don't exceed the bits reserved for userland */
      config_check_userland( RWM_CF_LAST );

      memset( &rwm, 0, sizeof( slap_overinst ) );

      rwm.on_bi.bi_type = "rwm";
      rwm.on_bi.bi_flags =
            SLAPO_BFLAG_SINGLE |
            0;

      rwm.on_bi.bi_db_init = rwm_db_init;
      rwm.on_bi.bi_db_config = rwm_db_config;
      rwm.on_bi.bi_db_destroy = rwm_db_destroy;

      rwm.on_bi.bi_op_bind = rwm_op_bind;
      rwm.on_bi.bi_op_search = rwm_op_search;
      rwm.on_bi.bi_op_compare = rwm_op_compare;
      rwm.on_bi.bi_op_modify = rwm_op_modify;
      rwm.on_bi.bi_op_modrdn = rwm_op_modrdn;
      rwm.on_bi.bi_op_add = rwm_op_add;
      rwm.on_bi.bi_op_delete = rwm_op_delete;
      rwm.on_bi.bi_op_unbind = rwm_op_unbind;
      rwm.on_bi.bi_extended = rwm_extended;

      rwm.on_bi.bi_operational = rwm_operational;
      rwm.on_bi.bi_chk_referrals = 0 /* rwm_chk_referrals */ ;

      rwm.on_bi.bi_connection_init = rwm_conn_init;
      rwm.on_bi.bi_connection_destroy = rwm_conn_destroy;

      rwm.on_response = rwm_response;

      rwm.on_bi.bi_cf_ocs = rwmocs;

      rc = config_register_schema( rwmcfg, rwmocs );
      if ( rc ) {
            return rc;
      }

      return overlay_register( &rwm );
}

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

#endif /* SLAPD_OVER_RWM */

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