filter.c   [plain text]

/* filter.c - routines for parsing and dealing with filters */
/* $OpenLDAP: pkg/ldap/servers/slapd/filter.c,v 1.134.2.18 2010/04/13 20:23:14 kurt Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2010 The OpenLDAP Foundation.
 * 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>.
 */
/* Portions Copyright (c) 1995 Regents of the University of Michigan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of Michigan at Ann Arbor. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#include "portable.h"

#include <stdio.h>

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

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

const Filter *slap_filter_objectClass_pres;
const struct berval *slap_filterstr_objectClass_pres;

static int	get_filter_list(
	Operation *op,
	BerElement *ber,
	Filter **f,
	const char **text );

static int	get_ssa(
	Operation *op,
	BerElement *ber,
	Filter *f,
	const char **text );

static void simple_vrFilter2bv(
	Operation *op,
	ValuesReturnFilter *f,
	struct berval *fstr );

static int	get_simple_vrFilter(
	Operation *op,
	BerElement *ber,
	ValuesReturnFilter **f,
	const char **text );

int
filter_init( void )
{
	static Filter filter_objectClass_pres = { LDAP_FILTER_PRESENT };
	static struct berval filterstr_objectClass_pres = BER_BVC("(objectClass=*)");

	filter_objectClass_pres.f_desc = slap_schema.si_ad_objectClass;

	slap_filter_objectClass_pres = &filter_objectClass_pres;
	slap_filterstr_objectClass_pres = &filterstr_objectClass_pres;

	return 0;
}

void
filter_destroy( void )
{
	return;
}

int
get_filter(
	Operation *op,
	BerElement *ber,
	Filter **filt,
	const char **text )
{
	ber_tag_t	tag;
	ber_len_t	len;
	int		err;
	Filter		f;

	Debug( LDAP_DEBUG_FILTER, "begin get_filter\n", 0, 0, 0 );
	/*
	 * A filter looks like this coming in:
	 *	Filter ::= CHOICE {
	 *		and		[0]	SET OF Filter,
	 *		or		[1]	SET OF Filter,
	 *		not		[2]	Filter,
	 *		equalityMatch	[3]	AttributeValueAssertion,
	 *		substrings	[4]	SubstringFilter,
	 *		greaterOrEqual	[5]	AttributeValueAssertion,
	 *		lessOrEqual	[6]	AttributeValueAssertion,
	 *		present		[7]	AttributeType,
	 *		approxMatch	[8]	AttributeValueAssertion,
	 *		extensibleMatch [9]	MatchingRuleAssertion
	 *	}
	 *
	 *	SubstringFilter ::= SEQUENCE {
	 *		type		   AttributeType,
	 *		SEQUENCE OF CHOICE {
	 *			initial		 [0] IA5String,
	 *			any		 [1] IA5String,
	 *			final		 [2] IA5String
	 *		}
	 *	}
	 *
	 *	MatchingRuleAssertion ::= SEQUENCE {
	 *		matchingRule	[1] MatchingRuleId OPTIONAL,
	 *		type		[2] AttributeDescription OPTIONAL,
	 *		matchValue	[3] AssertionValue,
	 *		dnAttributes	[4] BOOLEAN DEFAULT FALSE
	 *	}
	 *
	 */

	tag = ber_peek_tag( ber, &len );

	if( tag == LBER_ERROR ) {
		*text = "error decoding filter";
		return SLAPD_DISCONNECT;
	}

	err = LDAP_SUCCESS;

	f.f_next = NULL;
	f.f_choice = tag; 

	switch ( f.f_choice ) {
	case LDAP_FILTER_EQUALITY:
		Debug( LDAP_DEBUG_FILTER, "EQUALITY\n", 0, 0, 0 );
		err = get_ava( op, ber, &f, SLAP_MR_EQUALITY, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}

		assert( f.f_ava != NULL );
		break;

	case LDAP_FILTER_SUBSTRINGS:
		Debug( LDAP_DEBUG_FILTER, "SUBSTRINGS\n", 0, 0, 0 );
		err = get_ssa( op, ber, &f, text );
		if( err != LDAP_SUCCESS ) {
			break;
		}
		assert( f.f_sub != NULL );
		break;

	case LDAP_FILTER_GE:
		Debug( LDAP_DEBUG_FILTER, "GE\n", 0, 0, 0 );
		err = get_ava( op, ber, &f, SLAP_MR_ORDERING, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		assert( f.f_ava != NULL );
		break;

	case LDAP_FILTER_LE:
		Debug( LDAP_DEBUG_FILTER, "LE\n", 0, 0, 0 );
		err = get_ava( op, ber, &f, SLAP_MR_ORDERING, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		assert( f.f_ava != NULL );
		break;

	case LDAP_FILTER_PRESENT: {
		struct berval type;

		Debug( LDAP_DEBUG_FILTER, "PRESENT\n", 0, 0, 0 );
		if ( ber_scanf( ber, "m", &type ) == LBER_ERROR ) {
			err = SLAPD_DISCONNECT;
			*text = "error decoding filter";
			break;
		}

		f.f_desc = NULL;
		err = slap_bv2ad( &type, &f.f_desc, text );

		if( err != LDAP_SUCCESS ) {
			f.f_choice |= SLAPD_FILTER_UNDEFINED;
			err = slap_bv2undef_ad( &type, &f.f_desc, text,
				SLAP_AD_PROXIED|SLAP_AD_NOINSERT );

			if ( err != LDAP_SUCCESS ) {
				/* unrecognized attribute description or other error */
				Debug( LDAP_DEBUG_ANY, 
					"get_filter: conn %lu unknown attribute "
					"type=%s (%d)\n",
					op->o_connid, type.bv_val, err );

				err = LDAP_SUCCESS;
				f.f_desc = slap_bv2tmp_ad( &type, op->o_tmpmemctx );
			}
			*text = NULL;
		}

		assert( f.f_desc != NULL );
		} break;

	case LDAP_FILTER_APPROX:
		Debug( LDAP_DEBUG_FILTER, "APPROX\n", 0, 0, 0 );
		err = get_ava( op, ber, &f, SLAP_MR_EQUALITY_APPROX, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		assert( f.f_ava != NULL );
		break;

	case LDAP_FILTER_AND:
		Debug( LDAP_DEBUG_FILTER, "AND\n", 0, 0, 0 );
		err = get_filter_list( op, ber, &f.f_and, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		if ( f.f_and == NULL ) {
			f.f_choice = SLAPD_FILTER_COMPUTED;
			f.f_result = LDAP_COMPARE_TRUE;
		}
		/* no assert - list could be empty */
		break;

	case LDAP_FILTER_OR:
		Debug( LDAP_DEBUG_FILTER, "OR\n", 0, 0, 0 );
		err = get_filter_list( op, ber, &f.f_or, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		if ( f.f_or == NULL ) {
			f.f_choice = SLAPD_FILTER_COMPUTED;
			f.f_result = LDAP_COMPARE_FALSE;
		}
		/* no assert - list could be empty */
		break;

	case LDAP_FILTER_NOT:
		Debug( LDAP_DEBUG_FILTER, "NOT\n", 0, 0, 0 );
		(void) ber_skip_tag( ber, &len );
		err = get_filter( op, ber, &f.f_not, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}

		assert( f.f_not != NULL );
		if ( f.f_not->f_choice == SLAPD_FILTER_COMPUTED ) {
			int fresult = f.f_not->f_result;
			f.f_choice = SLAPD_FILTER_COMPUTED;
			op->o_tmpfree( f.f_not, op->o_tmpmemctx );
			f.f_not = NULL;

			switch( fresult ) {
			case LDAP_COMPARE_TRUE:
				f.f_result = LDAP_COMPARE_FALSE;
				break;
			case LDAP_COMPARE_FALSE:
				f.f_result = LDAP_COMPARE_TRUE;
				break;
			default: ;
				/* (!Undefined) is Undefined */
			}
		}
		break;

	case LDAP_FILTER_EXT:
		Debug( LDAP_DEBUG_FILTER, "EXTENSIBLE\n", 0, 0, 0 );

		err = get_mra( op, ber, &f, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}

		assert( f.f_mra != NULL );
		break;

	default:
		(void) ber_scanf( ber, "x" ); /* skip the element */
		Debug( LDAP_DEBUG_ANY, "get_filter: unknown filter type=%lu\n",
			f.f_choice, 0, 0 );
		f.f_choice = SLAPD_FILTER_COMPUTED;
		f.f_result = SLAPD_COMPARE_UNDEFINED;
		break;
	}

	if( err != LDAP_SUCCESS && err != SLAPD_DISCONNECT ) {
		/* ignore error */
		*text = NULL;
		f.f_choice = SLAPD_FILTER_COMPUTED;
		f.f_result = SLAPD_COMPARE_UNDEFINED;
		err = LDAP_SUCCESS;
	}

	if ( err == LDAP_SUCCESS ) {
		*filt = op->o_tmpalloc( sizeof(f), op->o_tmpmemctx );
		**filt = f;
	}

	Debug( LDAP_DEBUG_FILTER, "end get_filter %d\n", err, 0, 0 );

	return( err );
}

static int
get_filter_list( Operation *op, BerElement *ber,
	Filter **f,
	const char **text )
{
	Filter		**new;
	int		err;
	ber_tag_t	tag;
	ber_len_t	len;
	char		*last;

	Debug( LDAP_DEBUG_FILTER, "begin get_filter_list\n", 0, 0, 0 );
	new = f;
	for ( tag = ber_first_element( ber, &len, &last );
		tag != LBER_DEFAULT;
		tag = ber_next_element( ber, &len, last ) )
	{
		err = get_filter( op, ber, new, text );
		if ( err != LDAP_SUCCESS )
			return( err );
		new = &(*new)->f_next;
	}
	*new = NULL;

	Debug( LDAP_DEBUG_FILTER, "end get_filter_list\n", 0, 0, 0 );
	return( LDAP_SUCCESS );
}

static int
get_ssa(
	Operation *op,
	BerElement	*ber,
	Filter 		*f,
	const char	**text )
{
	ber_tag_t	tag;
	ber_len_t	len;
	int	rc;
	struct berval desc, value, nvalue;
	char		*last;
	SubstringsAssertion ssa;

	*text = "error decoding filter";

	Debug( LDAP_DEBUG_FILTER, "begin get_ssa\n", 0, 0, 0 );
	if ( ber_scanf( ber, "{m" /*}*/, &desc ) == LBER_ERROR ) {
		return SLAPD_DISCONNECT;
	}

	*text = NULL;

	ssa.sa_desc = NULL;
	ssa.sa_initial.bv_val = NULL;
	ssa.sa_any = NULL;
	ssa.sa_final.bv_val = NULL;

	rc = slap_bv2ad( &desc, &ssa.sa_desc, text );

	if( rc != LDAP_SUCCESS ) {
		f->f_choice |= SLAPD_FILTER_UNDEFINED;
		rc = slap_bv2undef_ad( &desc, &ssa.sa_desc, text,
			SLAP_AD_PROXIED|SLAP_AD_NOINSERT );

		if( rc != LDAP_SUCCESS ) {
			Debug( LDAP_DEBUG_ANY, 
				"get_ssa: conn %lu unknown attribute type=%s (%ld)\n",
				op->o_connid, desc.bv_val, (long) rc );
	
			ssa.sa_desc = slap_bv2tmp_ad( &desc, op->o_tmpmemctx );
		}
	}

	rc = LDAP_PROTOCOL_ERROR;

	/* If there is no substring matching rule, there's nothing
	 * we can do with this filter. But we continue to parse it
	 * for logging purposes.
	 */
	if ( ssa.sa_desc->ad_type->sat_substr == NULL ) {
		f->f_choice |= SLAPD_FILTER_UNDEFINED;
		Debug( LDAP_DEBUG_FILTER,
		"get_ssa: no substring matching rule for attributeType %s\n",
			desc.bv_val, 0, 0 );
	}

	for ( tag = ber_first_element( ber, &len, &last );
		tag != LBER_DEFAULT;
		tag = ber_next_element( ber, &len, last ) )
	{
		unsigned usage;

		rc = ber_scanf( ber, "m", &value );
		if ( rc == LBER_ERROR ) {
			rc = SLAPD_DISCONNECT;
			goto return_error;
		}

		if ( value.bv_val == NULL || value.bv_len == 0 ) {
			rc = LDAP_INVALID_SYNTAX;
			goto return_error;
		} 

		switch ( tag ) {
		case LDAP_SUBSTRING_INITIAL:
			if ( ssa.sa_initial.bv_val != NULL
				|| ssa.sa_any != NULL 
				|| ssa.sa_final.bv_val != NULL )
			{
				rc = LDAP_PROTOCOL_ERROR;
				goto return_error;
			}
			usage = SLAP_MR_SUBSTR_INITIAL;
			break;

		case LDAP_SUBSTRING_ANY:
			if ( ssa.sa_final.bv_val != NULL ) {
				rc = LDAP_PROTOCOL_ERROR;
				goto return_error;
			}
			usage = SLAP_MR_SUBSTR_ANY;
			break;

		case LDAP_SUBSTRING_FINAL:
			if ( ssa.sa_final.bv_val != NULL ) {
				rc = LDAP_PROTOCOL_ERROR;
				goto return_error;
			}

			usage = SLAP_MR_SUBSTR_FINAL;
			break;

		default:
			Debug( LDAP_DEBUG_FILTER,
				"  unknown substring choice=%ld\n",
				(long) tag, 0, 0 );

			rc = LDAP_PROTOCOL_ERROR;
			goto return_error;
		}

		/* validate/normalize using equality matching rule validator! */
		rc = asserted_value_validate_normalize(
			ssa.sa_desc, ssa.sa_desc->ad_type->sat_equality,
			usage, &value, &nvalue, text, op->o_tmpmemctx );
		if( rc != LDAP_SUCCESS ) {
			f->f_choice |= SLAPD_FILTER_UNDEFINED;
			Debug( LDAP_DEBUG_FILTER,
			"get_ssa: illegal value for attributeType %s (%d) %s\n",
				desc.bv_val, rc, *text );
			ber_dupbv_x( &nvalue, &value, op->o_tmpmemctx );
		}

		switch ( tag ) {
		case LDAP_SUBSTRING_INITIAL:
			Debug( LDAP_DEBUG_FILTER, "  INITIAL\n", 0, 0, 0 );
			ssa.sa_initial = nvalue;
			break;

		case LDAP_SUBSTRING_ANY:
			Debug( LDAP_DEBUG_FILTER, "  ANY\n", 0, 0, 0 );
			ber_bvarray_add_x( &ssa.sa_any, &nvalue, op->o_tmpmemctx );
			break;

		case LDAP_SUBSTRING_FINAL:
			Debug( LDAP_DEBUG_FILTER, "  FINAL\n", 0, 0, 0 );
			ssa.sa_final = nvalue;
			break;

		default:
			assert( 0 );
			slap_sl_free( nvalue.bv_val, op->o_tmpmemctx );
			rc = LDAP_PROTOCOL_ERROR;

return_error:
			Debug( LDAP_DEBUG_FILTER, "  error=%ld\n",
				(long) rc, 0, 0 );
			slap_sl_free( ssa.sa_initial.bv_val, op->o_tmpmemctx );
			ber_bvarray_free_x( ssa.sa_any, op->o_tmpmemctx );
			if ( ssa.sa_desc->ad_flags & SLAP_DESC_TEMPORARY )
				op->o_tmpfree( ssa.sa_desc, op->o_tmpmemctx );
			slap_sl_free( ssa.sa_final.bv_val, op->o_tmpmemctx );
			return rc;
		}

		*text = NULL;
		rc = LDAP_SUCCESS;
	}

	if( rc == LDAP_SUCCESS ) {
		f->f_sub = op->o_tmpalloc( sizeof( ssa ), op->o_tmpmemctx );
		*f->f_sub = ssa;
	}

	Debug( LDAP_DEBUG_FILTER, "end get_ssa\n", 0, 0, 0 );
	return rc /* LDAP_SUCCESS */ ;
}

void
filter_free_x( Operation *op, Filter *f, int freeme )
{
	Filter	*p, *next;

	if ( f == NULL ) {
		return;
	}

	f->f_choice &= SLAPD_FILTER_MASK;

	switch ( f->f_choice ) {
	case LDAP_FILTER_PRESENT:
		break;

	case LDAP_FILTER_EQUALITY:
	case LDAP_FILTER_GE:
	case LDAP_FILTER_LE:
	case LDAP_FILTER_APPROX:
		ava_free( op, f->f_ava, 1 );
		break;

	case LDAP_FILTER_SUBSTRINGS:
		if ( f->f_sub_initial.bv_val != NULL ) {
			op->o_tmpfree( f->f_sub_initial.bv_val, op->o_tmpmemctx );
		}
		ber_bvarray_free_x( f->f_sub_any, op->o_tmpmemctx );
		if ( f->f_sub_final.bv_val != NULL ) {
			op->o_tmpfree( f->f_sub_final.bv_val, op->o_tmpmemctx );
		}
		if ( f->f_sub->sa_desc->ad_flags & SLAP_DESC_TEMPORARY )
			op->o_tmpfree( f->f_sub->sa_desc, op->o_tmpmemctx );
		op->o_tmpfree( f->f_sub, op->o_tmpmemctx );
		break;

	case LDAP_FILTER_AND:
	case LDAP_FILTER_OR:
	case LDAP_FILTER_NOT:
		for ( p = f->f_list; p != NULL; p = next ) {
			next = p->f_next;
			filter_free_x( op, p, 1 );
		}
		break;

	case LDAP_FILTER_EXT:
		mra_free( op, f->f_mra, 1 );
		break;

	case SLAPD_FILTER_COMPUTED:
		break;

	default:
		Debug( LDAP_DEBUG_ANY, "filter_free: unknown filter type=%lu\n",
			f->f_choice, 0, 0 );
		break;
	}

	if ( freeme ) {
		op->o_tmpfree( f, op->o_tmpmemctx );
	}
}

void
filter_free( Filter *f )
{
	Operation op;
	Opheader ohdr;

	op.o_hdr = &ohdr;
	op.o_tmpmemctx = slap_sl_context( f );
	op.o_tmpmfuncs = &slap_sl_mfuncs;
	filter_free_x( &op, f, 1 );
}

void
filter2bv_x( Operation *op, Filter *f, struct berval *fstr )
{
	int		i;
	Filter		*p;
	struct berval	tmp, value;
	static struct berval
			ber_bvfalse = BER_BVC( "(?=false)" ),
			ber_bvtrue = BER_BVC( "(?=true)" ),
			ber_bvundefined = BER_BVC( "(?=undefined)" ),
			ber_bverror = BER_BVC( "(?=error)" ),
			ber_bvunknown = BER_BVC( "(?=unknown)" ),
			ber_bvnone = BER_BVC( "(?=none)" );
	ber_len_t	len;
	ber_tag_t	choice;
	int undef;
	char *sign;

	if ( f == NULL ) {
		ber_dupbv_x( fstr, &ber_bvnone, op->o_tmpmemctx );
		return;
	}

	undef = f->f_choice & SLAPD_FILTER_UNDEFINED;
	choice = f->f_choice & SLAPD_FILTER_MASK;

	switch ( choice ) {
	case LDAP_FILTER_EQUALITY:
		fstr->bv_len = STRLENOF("(=)");
		sign = "=";
		goto simple;
	case LDAP_FILTER_GE:
		fstr->bv_len = STRLENOF("(>=)");
		sign = ">=";
		goto simple;
	case LDAP_FILTER_LE:
		fstr->bv_len = STRLENOF("(<=)");
		sign = "<=";
		goto simple;
	case LDAP_FILTER_APPROX:
		fstr->bv_len = STRLENOF("(~=)");
		sign = "~=";

simple:
		value = f->f_av_value;
		if ( f->f_av_desc->ad_type->sat_equality &&
			!undef &&
			( f->f_av_desc->ad_type->sat_equality->smr_usage & SLAP_MR_MUTATION_NORMALIZER ))
		{
			f->f_av_desc->ad_type->sat_equality->smr_normalize(
				(SLAP_MR_DENORMALIZE|SLAP_MR_VALUE_OF_ASSERTION_SYNTAX),
				NULL, NULL, &f->f_av_value, &value, op->o_tmpmemctx );
		}

		filter_escape_value_x( &value, &tmp, op->o_tmpmemctx );
		/* NOTE: tmp can legitimately be NULL (meaning empty) 
		 * since in a Filter values in AVAs are supposed
		 * to have been normalized, meaning that an empty value
		 * is legal for that attribute's syntax */

		fstr->bv_len += f->f_av_desc->ad_cname.bv_len + tmp.bv_len;
		if ( undef )
			fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s%s%s%s)",
			undef ? "?" : "",
			f->f_av_desc->ad_cname.bv_val, sign,
			tmp.bv_len ? tmp.bv_val : "" );

		if ( value.bv_val != f->f_av_value.bv_val ) {
			ber_memfree_x( value.bv_val, op->o_tmpmemctx );
		}

		ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		break;

	case LDAP_FILTER_SUBSTRINGS:
		fstr->bv_len = f->f_sub_desc->ad_cname.bv_len +
			STRLENOF("(=*)");
		if ( undef )
			fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 128, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s%s=*)",
			undef ? "?" : "",
			f->f_sub_desc->ad_cname.bv_val );

		if ( f->f_sub_initial.bv_val != NULL ) {
			ber_len_t tmplen;

			len = fstr->bv_len;

			filter_escape_value_x( &f->f_sub_initial, &tmp, op->o_tmpmemctx );
			tmplen = tmp.bv_len;

			fstr->bv_len += tmplen;
			fstr->bv_val = op->o_tmprealloc( fstr->bv_val,
				fstr->bv_len + 1, op->o_tmpmemctx );

			snprintf( &fstr->bv_val[len - 2],
				tmplen + STRLENOF( /*(*/ "*)" ) + 1,
				/* "(attr=" */ "%s*)",
				tmp.bv_len ? tmp.bv_val : "");

			ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		}

		if ( f->f_sub_any != NULL ) {
			for ( i = 0; f->f_sub_any[i].bv_val != NULL; i++ ) {
				ber_len_t tmplen;

				len = fstr->bv_len;
				filter_escape_value_x( &f->f_sub_any[i],
					&tmp, op->o_tmpmemctx );
				tmplen = tmp.bv_len;

				fstr->bv_len += tmplen + STRLENOF( /*(*/ ")" );
				fstr->bv_val = op->o_tmprealloc( fstr->bv_val,
					fstr->bv_len + 1, op->o_tmpmemctx );

				snprintf( &fstr->bv_val[len - 1],
					tmplen + STRLENOF( /*(*/ "*)" ) + 1,
					/* "(attr=[init]*[any*]" */ "%s*)",
					tmp.bv_len ? tmp.bv_val : "");
				ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
			}
		}

		if ( f->f_sub_final.bv_val != NULL ) {
			ber_len_t tmplen;

			len = fstr->bv_len;

			filter_escape_value_x( &f->f_sub_final, &tmp, op->o_tmpmemctx );
			tmplen = tmp.bv_len;

			fstr->bv_len += tmplen;
			fstr->bv_val = op->o_tmprealloc( fstr->bv_val,
				fstr->bv_len + 1, op->o_tmpmemctx );

			snprintf( &fstr->bv_val[len - 1],
				tmplen + STRLENOF( /*(*/ ")" ) + 1,
				/* "(attr=[init*][any*]" */ "%s)",
				tmp.bv_len ? tmp.bv_val : "");

			ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		}

		break;

	case LDAP_FILTER_PRESENT:
		fstr->bv_len = f->f_desc->ad_cname.bv_len +
			STRLENOF("(=*)");
		if ( undef )
			fstr->bv_len++;

		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s%s=*)",
			undef ? "?" : "",
			f->f_desc->ad_cname.bv_val );
		break;

	case LDAP_FILTER_AND:
	case LDAP_FILTER_OR:
	case LDAP_FILTER_NOT:
		fstr->bv_len = STRLENOF("(%)");
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 128, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%c)",
			f->f_choice == LDAP_FILTER_AND ? '&' :
			f->f_choice == LDAP_FILTER_OR ? '|' : '!' );

		for ( p = f->f_list; p != NULL; p = p->f_next ) {
			len = fstr->bv_len;

			filter2bv_x( op, p, &tmp );
			
			fstr->bv_len += tmp.bv_len;
			fstr->bv_val = op->o_tmprealloc( fstr->bv_val, fstr->bv_len + 1,
				op->o_tmpmemctx );

			snprintf( &fstr->bv_val[len-1],
				tmp.bv_len + STRLENOF( /*(*/ ")" ) + 1, 
				/*"("*/ "%s)", tmp.bv_val );

			op->o_tmpfree( tmp.bv_val, op->o_tmpmemctx );
		}

		break;

	case LDAP_FILTER_EXT: {
		struct berval ad;

		filter_escape_value_x( &f->f_mr_value, &tmp, op->o_tmpmemctx );
		/* NOTE: tmp can legitimately be NULL (meaning empty) 
		 * since in a Filter values in MRAs are supposed
		 * to have been normalized, meaning that an empty value
		 * is legal for that attribute's syntax */

		if ( f->f_mr_desc ) {
			ad = f->f_mr_desc->ad_cname;
		} else {
			ad.bv_len = 0;
			ad.bv_val = "";
		}
		
		fstr->bv_len = ad.bv_len +
			( f->f_mr_dnattrs ? STRLENOF(":dn") : 0 ) +
			( f->f_mr_rule_text.bv_len ? f->f_mr_rule_text.bv_len+1 : 0 ) +
			tmp.bv_len + STRLENOF("(:=)");
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s%s%s%s%s:=%s)",
			undef ? "?" : "",
			ad.bv_val,
			f->f_mr_dnattrs ? ":dn" : "",
			f->f_mr_rule_text.bv_len ? ":" : "",
			f->f_mr_rule_text.bv_len ? f->f_mr_rule_text.bv_val : "",
			tmp.bv_len ? tmp.bv_val : "" );
		ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		} break;

	case SLAPD_FILTER_COMPUTED:
		switch ( f->f_result ) {
		case LDAP_COMPARE_FALSE:
			tmp = ber_bvfalse;
			break;

		case LDAP_COMPARE_TRUE:
			tmp = ber_bvtrue;
			break;
			
		case SLAPD_COMPARE_UNDEFINED:
			tmp = ber_bvundefined;
			break;
			
		default:
			tmp = ber_bverror;
			break;
		}

		ber_dupbv_x( fstr, &tmp, op->o_tmpmemctx );
		break;
		
	default:
		ber_dupbv_x( fstr, &ber_bvunknown, op->o_tmpmemctx );
		break;
	}
}

void
filter2bv( Filter *f, struct berval *fstr )
{
	Operation op;
	Opheader ohdr;

	op.o_hdr = &ohdr;
	op.o_tmpmemctx = NULL;
	op.o_tmpmfuncs = &ch_mfuncs;

	filter2bv_x( &op, f, fstr );
}

Filter *
filter_dup( Filter *f, void *memctx )
{
	BerMemoryFunctions *mf = &slap_sl_mfuncs;
	Filter *n;

	if ( !f )
		return NULL;

	n = mf->bmf_malloc( sizeof(Filter), memctx );
	n->f_choice = f->f_choice;
	n->f_next = NULL;

	switch( f->f_choice & SLAPD_FILTER_MASK ) {
	case SLAPD_FILTER_COMPUTED:
		n->f_result = f->f_result;
		break;
	case LDAP_FILTER_PRESENT:
		if ( f->f_desc->ad_flags & SLAP_DESC_TEMPORARY )
			n->f_desc = slap_bv2tmp_ad( &f->f_desc->ad_cname, memctx );
		else
			n->f_desc = f->f_desc;
		break;
	case LDAP_FILTER_EQUALITY:
	case LDAP_FILTER_GE:
	case LDAP_FILTER_LE:
	case LDAP_FILTER_APPROX:
		/* Should this be ava_dup() ? */
		n->f_ava = mf->bmf_calloc( 1, sizeof(AttributeAssertion), memctx );
		*n->f_ava = *f->f_ava;
		if ( f->f_av_desc->ad_flags & SLAP_DESC_TEMPORARY )
			n->f_av_desc = slap_bv2tmp_ad( &f->f_av_desc->ad_cname, memctx );
		ber_dupbv_x( &n->f_av_value, &f->f_av_value, memctx );
		break;
	case LDAP_FILTER_SUBSTRINGS:
		n->f_sub = mf->bmf_calloc( 1, sizeof(SubstringsAssertion), memctx );
		if ( f->f_sub_desc->ad_flags & SLAP_DESC_TEMPORARY )
			n->f_sub_desc = slap_bv2tmp_ad( &f->f_sub_desc->ad_cname, memctx );
		else
			n->f_sub_desc = f->f_sub_desc;
		if ( !BER_BVISNULL( &f->f_sub_initial ))
			ber_dupbv_x( &n->f_sub_initial, &f->f_sub_initial, memctx );
		if ( f->f_sub_any ) {
			int i;
			for ( i = 0; !BER_BVISNULL( &f->f_sub_any[i] ); i++ );
			n->f_sub_any = mf->bmf_malloc(( i+1 )*sizeof( struct berval ),
				memctx );
			for ( i = 0; !BER_BVISNULL( &f->f_sub_any[i] ); i++ ) {
				ber_dupbv_x( &n->f_sub_any[i], &f->f_sub_any[i], memctx );
			}
			BER_BVZERO( &n->f_sub_any[i] );
		}
		if ( !BER_BVISNULL( &f->f_sub_final ))
			ber_dupbv_x( &n->f_sub_final, &f->f_sub_final, memctx );
		break;
	case LDAP_FILTER_EXT: {
		/* Should this be mra_dup() ? */
		ber_len_t length;
		length = sizeof(MatchingRuleAssertion);
		if ( !BER_BVISNULL( &f->f_mr_rule_text ))
			length += f->f_mr_rule_text.bv_len + 1;
		n->f_mra = mf->bmf_calloc( 1, length, memctx );
		*n->f_mra = *f->f_mra;
		if ( f->f_mr_desc && ( f->f_sub_desc->ad_flags & SLAP_DESC_TEMPORARY ))
			n->f_mr_desc = slap_bv2tmp_ad( &f->f_mr_desc->ad_cname, memctx );
		ber_dupbv_x( &n->f_mr_value, &f->f_mr_value, memctx );
		if ( !BER_BVISNULL( &f->f_mr_rule_text )) {
			n->f_mr_rule_text.bv_val = (char *)(n->f_mra+1);
			AC_MEMCPY(n->f_mr_rule_text.bv_val,
				f->f_mr_rule_text.bv_val, f->f_mr_rule_text.bv_len );
		}
		} break;
	case LDAP_FILTER_AND:
	case LDAP_FILTER_OR:
	case LDAP_FILTER_NOT: {
		Filter **p;
		for ( p = &n->f_list, f = f->f_list; f; f = f->f_next ) {
			*p = filter_dup( f, memctx );
			p = &(*p)->f_next;
		}
		} break;
	}
	return n;
}

static int
get_simple_vrFilter(
	Operation *op,
	BerElement *ber,
	ValuesReturnFilter **filt,
	const char **text )
{
	ber_tag_t	tag;
	ber_len_t	len;
	int		err;
	ValuesReturnFilter vrf;

	Debug( LDAP_DEBUG_FILTER, "begin get_simple_vrFilter\n", 0, 0, 0 );

	tag = ber_peek_tag( ber, &len );

	if( tag == LBER_ERROR ) {
		*text = "error decoding filter";
		return SLAPD_DISCONNECT;
	}

	vrf.vrf_next = NULL;

	err = LDAP_SUCCESS;
	vrf.vrf_choice = tag; 

	switch ( vrf.vrf_choice ) {
	case LDAP_FILTER_EQUALITY:
		Debug( LDAP_DEBUG_FILTER, "EQUALITY\n", 0, 0, 0 );
		err = get_ava( op, ber, (Filter *)&vrf, SLAP_MR_EQUALITY, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}

		assert( vrf.vrf_ava != NULL );
		break;

	case LDAP_FILTER_SUBSTRINGS:
		Debug( LDAP_DEBUG_FILTER, "SUBSTRINGS\n", 0, 0, 0 );
		err = get_ssa( op, ber, (Filter *)&vrf, text );
		break;

	case LDAP_FILTER_GE:
		Debug( LDAP_DEBUG_FILTER, "GE\n", 0, 0, 0 );
		err = get_ava( op, ber, (Filter *)&vrf, SLAP_MR_ORDERING, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		break;

	case LDAP_FILTER_LE:
		Debug( LDAP_DEBUG_FILTER, "LE\n", 0, 0, 0 );
		err = get_ava( op, ber, (Filter *)&vrf, SLAP_MR_ORDERING, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		break;

	case LDAP_FILTER_PRESENT: {
		struct berval type;

		Debug( LDAP_DEBUG_FILTER, "PRESENT\n", 0, 0, 0 );
		if ( ber_scanf( ber, "m", &type ) == LBER_ERROR ) {
			err = SLAPD_DISCONNECT;
			*text = "error decoding filter";
			break;
		}

		vrf.vrf_desc = NULL;
		err = slap_bv2ad( &type, &vrf.vrf_desc, text );

		if( err != LDAP_SUCCESS ) {
			vrf.vrf_choice |= SLAPD_FILTER_UNDEFINED;
			err = slap_bv2undef_ad( &type, &vrf.vrf_desc, text,
				SLAP_AD_PROXIED);

			if( err != LDAP_SUCCESS ) {
				/* unrecognized attribute description or other error */
				Debug( LDAP_DEBUG_ANY, 
					"get_simple_vrFilter: conn %lu unknown "
					"attribute type=%s (%d)\n",
					op->o_connid, type.bv_val, err );
	
				vrf.vrf_choice = SLAPD_FILTER_COMPUTED;
				vrf.vrf_result = LDAP_COMPARE_FALSE;
				err = LDAP_SUCCESS;
				break;
			}
		}
		} break;

	case LDAP_FILTER_APPROX:
		Debug( LDAP_DEBUG_FILTER, "APPROX\n", 0, 0, 0 );
		err = get_ava( op, ber, (Filter *)&vrf, SLAP_MR_EQUALITY_APPROX, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}
		break;

	case LDAP_FILTER_EXT:
		Debug( LDAP_DEBUG_FILTER, "EXTENSIBLE\n", 0, 0, 0 );

		err = get_mra( op, ber, (Filter *)&vrf, text );
		if ( err != LDAP_SUCCESS ) {
			break;
		}

		assert( vrf.vrf_mra != NULL );
		break;

	default:
		(void) ber_scanf( ber, "x" ); /* skip the element */
		Debug( LDAP_DEBUG_ANY, "get_simple_vrFilter: unknown filter type=%lu\n",
			vrf.vrf_choice, 0, 0 );
		vrf.vrf_choice = SLAPD_FILTER_COMPUTED;
		vrf.vrf_result = SLAPD_COMPARE_UNDEFINED;
		break;
	}

	if ( err != LDAP_SUCCESS && err != SLAPD_DISCONNECT ) {
		/* ignore error */
		vrf.vrf_choice = SLAPD_FILTER_COMPUTED;
		vrf.vrf_result = SLAPD_COMPARE_UNDEFINED;
		err = LDAP_SUCCESS;
	}

	if ( err == LDAP_SUCCESS ) {
		*filt = op->o_tmpalloc( sizeof vrf, op->o_tmpmemctx );
		**filt = vrf;
	}

	Debug( LDAP_DEBUG_FILTER, "end get_simple_vrFilter %d\n", err, 0, 0 );

	return err;
}

int
get_vrFilter( Operation *op, BerElement *ber,
	ValuesReturnFilter **vrf,
	const char **text )
{
	/*
	 * A ValuesReturnFilter looks like this:
	 *
	 *	ValuesReturnFilter ::= SEQUENCE OF SimpleFilterItem
	 *      SimpleFilterItem ::= CHOICE {
	 *              equalityMatch   [3]     AttributeValueAssertion,
	 *              substrings      [4]     SubstringFilter,
	 *              greaterOrEqual  [5]     AttributeValueAssertion,
	 *              lessOrEqual     [6]     AttributeValueAssertion,
	 *              present         [7]     AttributeType,
	 *              approxMatch     [8]     AttributeValueAssertion,
	 *		extensibleMatch [9]	SimpleMatchingAssertion -- LDAPv3
	 *      }
	 *
	 *      SubstringFilter ::= SEQUENCE {
	 *              type               AttributeType,
	 *              SEQUENCE OF CHOICE {
	 *                      initial          [0] IA5String,
	 *                      any              [1] IA5String,
	 *                      final            [2] IA5String
	 *              }
	 *      }
	 *
	 *	SimpleMatchingAssertion ::= SEQUENCE {	-- LDAPv3
	 *		matchingRule    [1] MatchingRuleId OPTIONAL,
	 *		type            [2] AttributeDescription OPTIONAL,
	 *		matchValue      [3] AssertionValue }
	 */

	ValuesReturnFilter **n;
	ber_tag_t	tag;
	ber_len_t	len;
	char		*last;

	Debug( LDAP_DEBUG_FILTER, "begin get_vrFilter\n", 0, 0, 0 );

	tag = ber_peek_tag( ber, &len );

	if( tag == LBER_ERROR ) {
		*text = "error decoding vrFilter";
		return SLAPD_DISCONNECT;
	}

	if( tag != LBER_SEQUENCE ) {
		*text = "error decoding vrFilter, expect SEQUENCE tag";
		return SLAPD_DISCONNECT;
	}

	n = vrf;
	for ( tag = ber_first_element( ber, &len, &last );
		tag != LBER_DEFAULT;
		tag = ber_next_element( ber, &len, last ) )
	{
		int err = get_simple_vrFilter( op, ber, n, text );

		if ( err != LDAP_SUCCESS ) return( err );

		n = &(*n)->vrf_next;
	}
	*n = NULL;

	Debug( LDAP_DEBUG_FILTER, "end get_vrFilter\n", 0, 0, 0 );
	return( LDAP_SUCCESS );
}

void
vrFilter_free( Operation *op, ValuesReturnFilter *vrf )
{
	ValuesReturnFilter	*p, *next;

	if ( vrf == NULL ) {
		return;
	}

	for ( p = vrf; p != NULL; p = next ) {
		next = p->vrf_next;

		switch ( vrf->vrf_choice & SLAPD_FILTER_MASK ) {
		case LDAP_FILTER_PRESENT:
			break;

		case LDAP_FILTER_EQUALITY:
		case LDAP_FILTER_GE:
		case LDAP_FILTER_LE:
		case LDAP_FILTER_APPROX:
			ava_free( op, vrf->vrf_ava, 1 );
			break;

		case LDAP_FILTER_SUBSTRINGS:
			if ( vrf->vrf_sub_initial.bv_val != NULL ) {
				op->o_tmpfree( vrf->vrf_sub_initial.bv_val, op->o_tmpmemctx );
			}
			ber_bvarray_free_x( vrf->vrf_sub_any, op->o_tmpmemctx );
			if ( vrf->vrf_sub_final.bv_val != NULL ) {
				op->o_tmpfree( vrf->vrf_sub_final.bv_val, op->o_tmpmemctx );
			}
			op->o_tmpfree( vrf->vrf_sub, op->o_tmpmemctx );
			break;

		case LDAP_FILTER_EXT:
			mra_free( op, vrf->vrf_mra, 1 );
			break;

		case SLAPD_FILTER_COMPUTED:
			break;

		default:
			Debug( LDAP_DEBUG_ANY, "filter_free: unknown filter type=%lu\n",
				vrf->vrf_choice, 0, 0 );
			break;
		}

		op->o_tmpfree( vrf, op->o_tmpmemctx );
	}
}

void
vrFilter2bv( Operation *op, ValuesReturnFilter *vrf, struct berval *fstr )
{
	ValuesReturnFilter	*p;
	struct berval tmp;
	ber_len_t len;

	if ( vrf == NULL ) {
		ber_str2bv_x( "No filter!", STRLENOF("No filter!"),
			1, fstr, op->o_tmpmemctx );
		return;
	}

	fstr->bv_len = STRLENOF("()");
	fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 128, op->o_tmpmemctx );

	snprintf( fstr->bv_val, fstr->bv_len + 1, "()");

	for ( p = vrf; p != NULL; p = p->vrf_next ) {
		len = fstr->bv_len;

		simple_vrFilter2bv( op, p, &tmp );
			
		fstr->bv_len += tmp.bv_len;
		fstr->bv_val = op->o_tmprealloc( fstr->bv_val, fstr->bv_len + 1,
			op->o_tmpmemctx );

		snprintf( &fstr->bv_val[len-1], tmp.bv_len + 2, 
			/*"("*/ "%s)", tmp.bv_val );

		op->o_tmpfree( tmp.bv_val, op->o_tmpmemctx );
	}
}

static void
simple_vrFilter2bv( Operation *op, ValuesReturnFilter *vrf, struct berval *fstr )
{
	struct berval tmp;
	ber_len_t len;
	int undef;

	if ( vrf == NULL ) {
		ber_str2bv_x( "No filter!", STRLENOF("No filter!"), 1, fstr,
			op->o_tmpmemctx );
		return;
	}
	undef = vrf->vrf_choice & SLAPD_FILTER_UNDEFINED;

	switch ( vrf->vrf_choice & SLAPD_FILTER_MASK ) {
	case LDAP_FILTER_EQUALITY:
		filter_escape_value_x( &vrf->vrf_av_value, &tmp, op->o_tmpmemctx );

		fstr->bv_len = vrf->vrf_av_desc->ad_cname.bv_len +
			tmp.bv_len + STRLENOF("(=)");
		if ( undef ) fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s=%s)",
			vrf->vrf_av_desc->ad_cname.bv_val,
			tmp.bv_val );

		ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		break;

	case LDAP_FILTER_GE:
		filter_escape_value_x( &vrf->vrf_av_value, &tmp, op->o_tmpmemctx );

		fstr->bv_len = vrf->vrf_av_desc->ad_cname.bv_len +
			tmp.bv_len + STRLENOF("(>=)");
		if ( undef ) fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s>=%s)",
			vrf->vrf_av_desc->ad_cname.bv_val,
			tmp.bv_val );

		ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		break;

	case LDAP_FILTER_LE:
		filter_escape_value_x( &vrf->vrf_av_value, &tmp, op->o_tmpmemctx );

		fstr->bv_len = vrf->vrf_av_desc->ad_cname.bv_len +
			tmp.bv_len + STRLENOF("(<=)");
		if ( undef ) fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s<=%s)",
			vrf->vrf_av_desc->ad_cname.bv_val,
			tmp.bv_val );

		ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		break;

	case LDAP_FILTER_APPROX:
		filter_escape_value_x( &vrf->vrf_av_value, &tmp, op->o_tmpmemctx );

		fstr->bv_len = vrf->vrf_av_desc->ad_cname.bv_len +
			tmp.bv_len + STRLENOF("(~=)");
		if ( undef ) fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s~=%s)",
			vrf->vrf_av_desc->ad_cname.bv_val,
			tmp.bv_val );
		ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		break;

	case LDAP_FILTER_SUBSTRINGS:
		fstr->bv_len = vrf->vrf_sub_desc->ad_cname.bv_len +
			STRLENOF("(=*)");
		if ( undef ) fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 128, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s=*)",
			vrf->vrf_sub_desc->ad_cname.bv_val );

		if ( vrf->vrf_sub_initial.bv_val != NULL ) {
			len = fstr->bv_len;

			filter_escape_value_x( &vrf->vrf_sub_initial, &tmp, op->o_tmpmemctx );

			fstr->bv_len += tmp.bv_len;
			fstr->bv_val = op->o_tmprealloc( fstr->bv_val, fstr->bv_len + 1,
				op->o_tmpmemctx );

			snprintf( &fstr->bv_val[len-2], tmp.bv_len+3,
				/* "(attr=" */ "%s*)",
				tmp.bv_val );

			ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		}

		if ( vrf->vrf_sub_any != NULL ) {
			int i;
			for ( i = 0; vrf->vrf_sub_any[i].bv_val != NULL; i++ ) {
				len = fstr->bv_len;
				filter_escape_value_x( &vrf->vrf_sub_any[i], &tmp,
					op->o_tmpmemctx );

				fstr->bv_len += tmp.bv_len + 1;
				fstr->bv_val = op->o_tmprealloc( fstr->bv_val,
					fstr->bv_len + 1, op->o_tmpmemctx );

				snprintf( &fstr->bv_val[len-1], tmp.bv_len+3,
					/* "(attr=[init]*[any*]" */ "%s*)",
					tmp.bv_val );
				ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
			}
		}

		if ( vrf->vrf_sub_final.bv_val != NULL ) {
			len = fstr->bv_len;

			filter_escape_value_x( &vrf->vrf_sub_final, &tmp, op->o_tmpmemctx );

			fstr->bv_len += tmp.bv_len;
			fstr->bv_val = op->o_tmprealloc( fstr->bv_val, fstr->bv_len + 1,
				op->o_tmpmemctx );

			snprintf( &fstr->bv_val[len-1], tmp.bv_len+3,
				/* "(attr=[init*][any*]" */ "%s)",
				tmp.bv_val );

			ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		}

		break;

	case LDAP_FILTER_PRESENT:
		fstr->bv_len = vrf->vrf_desc->ad_cname.bv_len +
			STRLENOF("(=*)");
		if ( undef ) fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s=*)",
			vrf->vrf_desc->ad_cname.bv_val );
		break;

	case LDAP_FILTER_EXT: {
		struct berval ad;
		filter_escape_value_x( &vrf->vrf_mr_value, &tmp, op->o_tmpmemctx );

		if ( vrf->vrf_mr_desc ) {
			ad = vrf->vrf_mr_desc->ad_cname;
		} else {
			ad.bv_len = 0;
			ad.bv_val = "";
		}
			
		fstr->bv_len = ad.bv_len +
			( vrf->vrf_mr_dnattrs ? STRLENOF(":dn") : 0 ) +
			( vrf->vrf_mr_rule_text.bv_len
				? vrf->vrf_mr_rule_text.bv_len+1 : 0 ) +
			tmp.bv_len + STRLENOF("(:=)");
		if ( undef ) fstr->bv_len++;
		fstr->bv_val = op->o_tmpalloc( fstr->bv_len + 1, op->o_tmpmemctx );

		snprintf( fstr->bv_val, fstr->bv_len + 1, "(%s%s%s%s:=%s)",
			ad.bv_val,
			vrf->vrf_mr_dnattrs ? ":dn" : "",
			vrf->vrf_mr_rule_text.bv_len ? ":" : "",
			vrf->vrf_mr_rule_text.bv_len ? vrf->vrf_mr_rule_text.bv_val : "",
			tmp.bv_val );

		ber_memfree_x( tmp.bv_val, op->o_tmpmemctx );
		} break;

	case SLAPD_FILTER_COMPUTED:
		ber_str2bv_x(
			vrf->vrf_result == LDAP_COMPARE_FALSE ? "(?=false)" :
			vrf->vrf_result == LDAP_COMPARE_TRUE ? "(?=true)" :
			vrf->vrf_result == SLAPD_COMPARE_UNDEFINED
				? "(?=undefined)" : "(?=error)",
			vrf->vrf_result == LDAP_COMPARE_FALSE ? STRLENOF("(?=false)") :
			vrf->vrf_result == LDAP_COMPARE_TRUE ? STRLENOF("(?=true)") :
			vrf->vrf_result == SLAPD_COMPARE_UNDEFINED
				? STRLENOF("(?=undefined)") : STRLENOF("(?=error)"),
			1, fstr, op->o_tmpmemctx );
		break;

	default:
		ber_str2bv_x( "(?=unknown)", STRLENOF("(?=unknown)"),
			1, fstr, op->o_tmpmemctx );
		break;
	}
}