schema_init.c

/* schema_init.c - init builtin schema */
/* $OpenLDAP$ */
/*
 * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
 */

#include "portable.h"

#include <stdio.h>
#include <limits.h>

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

#include "slap.h"
#include "ldap_pvt.h"
#include "lber_pvt.h"

#include "ldap_utf8.h"

#include "lutil_hash.h"
#define HASH_BYTES				LUTIL_HASH_BYTES
#define HASH_CONTEXT			lutil_HASH_CTX
#define HASH_Init(c)			lutil_HASHInit(c)
#define HASH_Update(c,buf,len)	lutil_HASHUpdate(c,buf,len)
#define HASH_Final(d,c)			lutil_HASHFinal(d,c)

/* recycled validatation routines */
#define berValidate						blobValidate

/* unimplemented pretters */
#define integerPretty					NULL

/* recycled matching routines */
#define bitStringMatch					octetStringMatch
#define numericStringMatch				caseIgnoreIA5Match
#define objectIdentifierMatch			caseIgnoreIA5Match
#define telephoneNumberMatch			caseIgnoreIA5Match
#define telephoneNumberSubstringsMatch	caseIgnoreIA5SubstringsMatch
#define generalizedTimeMatch			caseIgnoreIA5Match
#define generalizedTimeOrderingMatch	caseIgnoreIA5Match
#define uniqueMemberMatch				dnMatch

/* approx matching rules */
#define directoryStringApproxMatchOID	"1.3.6.1.4.1.4203.666.4.4"
#define directoryStringApproxMatch	approxMatch
#define directoryStringApproxIndexer	approxIndexer
#define directoryStringApproxFilter	approxFilter
#define IA5StringApproxMatchOID			"1.3.6.1.4.1.4203.666.4.5"
#define IA5StringApproxMatch			approxMatch
#define IA5StringApproxIndexer			approxIndexer
#define IA5StringApproxFilter			approxFilter

/* orderring matching rules */
#define caseIgnoreOrderingMatch			caseIgnoreMatch
#define caseExactOrderingMatch			caseExactMatch

/* unimplemented matching routines */
#define caseIgnoreListMatch				NULL
#define caseIgnoreListSubstringsMatch	NULL
#define protocolInformationMatch		NULL
#define integerFirstComponentMatch		NULL

#ifdef SLAPD_ACI_ENABLED
#define OpenLDAPaciMatch				NULL
#endif
#ifdef SLAPD_AUTHPASSWD
#define authPasswordMatch				NULL
#endif

/* recycled indexing/filtering routines */
#define dnIndexer				caseExactIgnoreIndexer
#define dnFilter				caseExactIgnoreFilter
#define bitStringFilter			octetStringFilter
#define bitStringIndexer		octetStringIndexer

#define telephoneNumberIndexer			caseIgnoreIA5Indexer
#define telephoneNumberFilter			caseIgnoreIA5Filter
#define telephoneNumberSubstringsIndexer	caseIgnoreIA5SubstringsIndexer
#define telephoneNumberSubstringsFilter		caseIgnoreIA5SubstringsFilter

/* must match OIDs below */
#define caseExactMatchOID			"2.5.13.5"
#define caseExactSubstringsMatchOID		"2.5.13.7"

static char *bvcasechr( struct berval *bv, int c, ber_len_t *len )
{
	ber_len_t i;
	int lower = TOLOWER( c );
	int upper = TOUPPER( c );

	if( c == 0 ) return NULL;
	
	for( i=0; i < bv->bv_len; i++ ) {
		if( upper == bv->bv_val[i] || lower == bv->bv_val[i] ) {
			*len = i;
			return &bv->bv_val[i];
		}
	}

	return NULL;
}

static int
octetStringMatch(
	int *matchp,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
	int match = value->bv_len - ((struct berval *) assertedValue)->bv_len;

	if( match == 0 ) {
		match = memcmp( value->bv_val,
			((struct berval *) assertedValue)->bv_val,
			value->bv_len );
	}

	*matchp = match;
	return LDAP_SUCCESS;
}

/* Index generation function */
static int octetStringIndexer(
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	BerVarray values,
	BerVarray *keysp )
{
	int i;
	size_t slen, mlen;
	BerVarray keys;
	HASH_CONTEXT   HASHcontext;
	unsigned char	HASHdigest[HASH_BYTES];
	struct berval digest;
	digest.bv_val = HASHdigest;
	digest.bv_len = sizeof(HASHdigest);

	for( i=0; values[i].bv_val != NULL; i++ ) {
		/* just count them */
	}

	/* we should have at least one value at this point */
	assert( i > 0 );

	keys = ch_malloc( sizeof( struct berval ) * (i+1) );

	slen = syntax->ssyn_oidlen;
	mlen = mr->smr_oidlen;

	for( i=0; values[i].bv_val != NULL; i++ ) {
		HASH_Init( &HASHcontext );
		if( prefix != NULL && prefix->bv_len > 0 ) {
			HASH_Update( &HASHcontext,
				prefix->bv_val, prefix->bv_len );
		}
		HASH_Update( &HASHcontext,
			syntax->ssyn_oid, slen );
		HASH_Update( &HASHcontext,
			mr->smr_oid, mlen );
		HASH_Update( &HASHcontext,
			values[i].bv_val, values[i].bv_len );
		HASH_Final( HASHdigest, &HASHcontext );

		ber_dupbv( &keys[i], &digest );
	}

	keys[i].bv_val = NULL;

	*keysp = keys;

	return LDAP_SUCCESS;
}

/* Index generation function */
static int octetStringFilter(
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	void * assertValue,
	BerVarray *keysp )
{
	size_t slen, mlen;
	BerVarray keys;
	HASH_CONTEXT   HASHcontext;
	unsigned char	HASHdigest[HASH_BYTES];
	struct berval *value = (struct berval *) assertValue;
	struct berval digest;
	digest.bv_val = HASHdigest;
	digest.bv_len = sizeof(HASHdigest);

	slen = syntax->ssyn_oidlen;
	mlen = mr->smr_oidlen;

	keys = ch_malloc( sizeof( struct berval ) * 2 );

	HASH_Init( &HASHcontext );
	if( prefix != NULL && prefix->bv_len > 0 ) {
		HASH_Update( &HASHcontext,
			prefix->bv_val, prefix->bv_len );
	}
	HASH_Update( &HASHcontext,
		syntax->ssyn_oid, slen );
	HASH_Update( &HASHcontext,
		mr->smr_oid, mlen );
	HASH_Update( &HASHcontext,
		value->bv_val, value->bv_len );
	HASH_Final( HASHdigest, &HASHcontext );

	ber_dupbv( keys, &digest );
	keys[1].bv_val = NULL;

	*keysp = keys;

	return LDAP_SUCCESS;
}

static int
nameUIDValidate(
	Syntax *syntax,
	struct berval *in )
{
	int rc;
	struct berval dn;

	if( in->bv_len == 0 ) return LDAP_SUCCESS;

	ber_dupbv( &dn, in );
	if( !dn.bv_val ) return LDAP_OTHER;

	if( dn.bv_val[dn.bv_len-1] == 'B'
		&& dn.bv_val[dn.bv_len-2] == '\'' )
	{
		/* assume presence of optional UID */
		ber_len_t i;

		for(i=dn.bv_len-3; i>1; i--) {
			if( dn.bv_val[i] != '0' &&	dn.bv_val[i] != '1' ) {
				break;
			}
		}
		if( dn.bv_val[i] != '\'' ||
		    dn.bv_val[i-1] != '#' ) {
			ber_memfree( dn.bv_val );
			return LDAP_INVALID_SYNTAX;
		}

		/* trim the UID to allow use of dnValidate */
		dn.bv_val[i-1] = '\0';
		dn.bv_len = i-1;
	}

	rc = dnValidate( NULL, &dn );

	ber_memfree( &dn );
	return rc;
}

static int
nameUIDNormalize(
	Syntax *syntax,
	struct berval *val,
	struct berval *normalized )
{
	struct berval out;
	int rc;

	ber_dupbv( &out, val );
	if( out.bv_len != 0 ) {
		ber_len_t dnlen;
		char *uid = NULL;
		ber_len_t uidlen = 0;

		if( out.bv_val[out.bv_len-1] == '\'' ) {
			/* assume presence of optional UID */
			uid = strrchr( out.bv_val, '#' );

			if( uid == NULL ) {
				free( out.bv_val );
				return LDAP_INVALID_SYNTAX;
			}

			uidlen = out.bv_len - (uid - out.bv_val);
			/* temporarily trim the UID */
			*uid = '\0';
			out.bv_len -= uidlen;
		}

#ifdef USE_DN_NORMALIZE
		rc = dnNormalize2( NULL, &out, normalized );
#else
		rc = dnPretty2( NULL, &out, normalized );
#endif

		if( rc != LDAP_SUCCESS ) {
			free( out.bv_val );
			return LDAP_INVALID_SYNTAX;
		}

		dnlen = normalized->bv_len;

		if( uidlen ) {
			struct berval b2;
			b2.bv_val = ch_malloc(dnlen + uidlen + 1);
			AC_MEMCPY( b2.bv_val, normalized->bv_val, dnlen );

			/* restore the separator */
			*uid = '#';
			/* shift the UID */
			AC_MEMCPY( normalized->bv_val+dnlen, uid, uidlen );
			b2.bv_len = dnlen + uidlen;
			normalized->bv_val[dnlen+uidlen] = '\0';
			free(normalized->bv_val);
			*normalized = b2;
		}
		free( out.bv_val );
	}

	return LDAP_SUCCESS;
}

static int
inValidate(
	Syntax *syntax,
	struct berval *in )
{
	/* any value allowed */
	return LDAP_OTHER;
}

static int
blobValidate(
	Syntax *syntax,
	struct berval *in )
{
	/* any value allowed */
	return LDAP_SUCCESS;
}

static int
bitStringValidate(
	Syntax *syntax,
	struct berval *in )
{
	ber_len_t i;

	/* very unforgiving validation, requires no normalization
	 * before simplistic matching
	 */
	if( in->bv_len < 3 ) {
		return LDAP_INVALID_SYNTAX;
	}

	/*
	 * rfc 2252 section 6.3 Bit String
	 * bitstring = "'" *binary-digit "'"
	 * binary-digit = "0" / "1"
	 * example: '0101111101'B
	 */
	
	if( in->bv_val[0] != '\'' ||
		in->bv_val[in->bv_len-2] != '\'' ||
		in->bv_val[in->bv_len-1] != 'B' )
	{
		return LDAP_INVALID_SYNTAX;
	}

	for( i=in->bv_len-3; i>0; i-- ) {
		if( in->bv_val[i] != '0' && in->bv_val[i] != '1' ) {
			return LDAP_INVALID_SYNTAX;
		}
	}

	return LDAP_SUCCESS;
}

static int
bitStringNormalize(
	Syntax *syntax,
	struct berval *val,
	struct berval *normalized )
{
	/*
	 * A normalized bitString is has no extaneous (leading) zero bits.
	 * That is, '00010'B is normalized to '10'B
	 * However, as a special case, '0'B requires no normalization.
	 */
	char *p;

	/* start at the first bit */
	p = &val->bv_val[1];

	/* Find the first non-zero bit */
	while ( *p == '0' ) p++;

	if( *p == '\'' ) {
		/* no non-zero bits */
		ber_str2bv( "\'0\'B", sizeof("\'0\'B") - 1, 1, normalized );
		goto done;
	}

	normalized->bv_val = ch_malloc( val->bv_len + 1 );

	normalized->bv_val[0] = '\'';
	normalized->bv_len = 1;

	for( ; *p != '\0'; p++ ) {
		normalized->bv_val[normalized->bv_len++] = *p;
	}

	normalized->bv_val[normalized->bv_len] = '\0';

done:
	return LDAP_SUCCESS;
}

/*
 * Handling boolean syntax and matching is quite rigid.
 * A more flexible approach would be to allow a variety
 * of strings to be normalized and prettied into TRUE
 * and FALSE.
 */
static int
booleanValidate(
	Syntax *syntax,
	struct berval *in )
{
	/* very unforgiving validation, requires no normalization
	 * before simplistic matching
	 */

	if( in->bv_len == 4 ) {
		if( !memcmp( in->bv_val, "TRUE", 4 ) ) {
			return LDAP_SUCCESS;
		}
	} else if( in->bv_len == 5 ) {
		if( !memcmp( in->bv_val, "FALSE", 5 ) ) {
			return LDAP_SUCCESS;
		}
	}

	return LDAP_INVALID_SYNTAX;
}

static int
booleanMatch(
	int *matchp,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
	/* simplistic matching allowed by rigid validation */
	struct berval *asserted = (struct berval *) assertedValue;
	*matchp = value->bv_len != asserted->bv_len;
	return LDAP_SUCCESS;
}

static int
UTF8StringValidate(
	Syntax *syntax,
	struct berval *in )
{
	ber_len_t count;
	int len;
	unsigned char *u = in->bv_val;

	if( !in->bv_len ) return LDAP_INVALID_SYNTAX;

	for( count = in->bv_len; count > 0; count-=len, u+=len ) {
		/* get the length indicated by the first byte */
		len = LDAP_UTF8_CHARLEN2( u, len );

		/* very basic checks */
		switch( len ) {
			case 6:
				if( (u[5] & 0xC0) != 0x80 ) {
					return LDAP_INVALID_SYNTAX;
				}
			case 5:
				if( (u[4] & 0xC0) != 0x80 ) {
					return LDAP_INVALID_SYNTAX;
				}
			case 4:
				if( (u[3] & 0xC0) != 0x80 ) {
					return LDAP_INVALID_SYNTAX;
				}
			case 3:
				if( (u[2] & 0xC0 )!= 0x80 ) {
					return LDAP_INVALID_SYNTAX;
				}
			case 2:
				if( (u[1] & 0xC0) != 0x80 ) {
					return LDAP_INVALID_SYNTAX;
				}
			case 1:
				/* CHARLEN already validated it */
				break;
			default:
				return LDAP_INVALID_SYNTAX;
		}

		/* make sure len corresponds with the offset
			to the next character */
		if( LDAP_UTF8_OFFSET( u ) != len ) return LDAP_INVALID_SYNTAX;
	}

	if( count != 0 ) return LDAP_INVALID_SYNTAX;

	return LDAP_SUCCESS;
}

static int
UTF8StringNormalize(
	Syntax *syntax,
	struct berval *val,
	struct berval *normalized )
{
	char *p, *q, *s, *e;
	int len = 0;

	p = val->bv_val;

	/* Ignore initial whitespace */
	/* All space is ASCII. All ASCII is 1 byte */
	for ( ; p < val->bv_val + val->bv_len && ASCII_SPACE( p[ 0 ] ); p++ );

	ber_mem2bv( p, val->bv_len - (p - val->bv_val), 1, normalized );
	e = normalized->bv_val + val->bv_len - (p - val->bv_val);

	assert( normalized->bv_val );

	p = q = normalized->bv_val;
	s = NULL;

	while ( p < e ) {
		q += len;
		if ( ASCII_SPACE( *p ) ) {
			s = q - len;
			len = 1;
			*q = *p++;

			/* Ignore the extra whitespace */
			while ( ASCII_SPACE( *p ) ) {
				p++;
			}
		} else {
			len = LDAP_UTF8_COPY(q,p);
			s=NULL;
			p+=len;
		}
	}

	assert( normalized->bv_val < p );
	assert( q+len <= p );

	/* cannot start with a space */
	assert( !ASCII_SPACE(normalized->bv_val[0]) );

	/*
	 * If the string ended in space, backup the pointer one
	 * position.  One is enough because the above loop collapsed
	 * all whitespace to a single space.
	 */

	if ( s != NULL ) {
		len = q - s;
		q = s;
	}

	/* cannot end with a space */
	assert( !ASCII_SPACE( *q ) );

	q += len;

	/* null terminate */
	*q = '\0';

	normalized->bv_len = q - normalized->bv_val;

	return LDAP_SUCCESS;
}

/* Returns Unicode canonically normalized copy of a substring assertion
 * Skipping attribute description */
static SubstringsAssertion *
UTF8SubstringsassertionNormalize(
	SubstringsAssertion *sa,
	unsigned casefold )
{
	SubstringsAssertion *nsa;
	int i;

	nsa = (SubstringsAssertion *)ch_calloc( 1, sizeof(SubstringsAssertion) );
	if( nsa == NULL ) {
		return NULL;
	}

	if( sa->sa_initial.bv_val != NULL ) {
		UTF8bvnormalize( &sa->sa_initial, &nsa->sa_initial, casefold );
		if( nsa->sa_initial.bv_val == NULL ) {
			goto err;
		}
	}

	if( sa->sa_any != NULL ) {
		for( i=0; sa->sa_any[i].bv_val != NULL; i++ ) {
			/* empty */
		}
		nsa->sa_any = (struct berval *)ch_malloc( (i + 1) * sizeof(struct berval) );
		for( i=0; sa->sa_any[i].bv_val != NULL; i++ ) {
			UTF8bvnormalize( &sa->sa_any[i], &nsa->sa_any[i], 
					casefold );
			if( nsa->sa_any[i].bv_val == NULL ) {
				goto err;
			}
		}
		nsa->sa_any[i].bv_val = NULL;
	}

	if( sa->sa_final.bv_val != NULL ) {
		UTF8bvnormalize( &sa->sa_final, &nsa->sa_final, casefold );
		if( nsa->sa_final.bv_val == NULL ) {
			goto err;
		}
	}

	return nsa;

err:
	if ( nsa->sa_final.bv_val ) free( nsa->sa_final.bv_val );
	if ( nsa->sa_any )ber_bvarray_free( nsa->sa_any );
	if ( nsa->sa_initial.bv_val ) free( nsa->sa_initial.bv_val );
	ch_free( nsa );
	return NULL;
}

/* Strip characters with the 8th bit set */
static char *
strip8bitChars(
	char *in )      
{
	char *p = in, *q;
  
	if( in == NULL ) {
		return NULL;
	}
	while( *p ) {
		if( *p & 0x80 ) {
			q = p;
			while( *++q & 0x80 ) {
				/* empty */
			}
			p = AC_MEMCPY(p, q, strlen(q) + 1);
		} else {
			p++;
		}
	}
	return in;
}

#ifndef SLAPD_APPROX_OLDSINGLESTRING

#if defined(SLAPD_APPROX_INITIALS)
#define SLAPD_APPROX_DELIMITER "._ "
#define SLAPD_APPROX_WORDLEN 2
#else
#define SLAPD_APPROX_DELIMITER " "
#define SLAPD_APPROX_WORDLEN 1
#endif

static int
approxMatch(
	int *matchp,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
	char *val, *nval, *assertv, **values, **words, *c;
	int i, count, len, nextchunk=0, nextavail=0;
	size_t avlen;

	/* Yes, this is necessary */
	nval = UTF8normalize( value, LDAP_UTF8_NOCASEFOLD );
	if( nval == NULL ) {
		*matchp = 1;
		return LDAP_SUCCESS;
	}
	strip8bitChars( nval );

	/* Yes, this is necessary */
	assertv = UTF8normalize( ((struct berval *)assertedValue),
		LDAP_UTF8_NOCASEFOLD );
	if( assertv == NULL ) {
		ch_free( nval );
		*matchp = 1;
		return LDAP_SUCCESS;
	}
	strip8bitChars( assertv );
	avlen = strlen( assertv );

	/* Isolate how many words there are */
	for( c=nval,count=1; *c; c++ ) {
		c = strpbrk( c, SLAPD_APPROX_DELIMITER );
		if ( c == NULL ) break;
		*c = '\0';
		count++;
	}

	/* Get a phonetic copy of each word */
	words = (char **)ch_malloc( count * sizeof(char *) );
	values = (char **)ch_malloc( count * sizeof(char *) );
	for( c=nval,i=0;  i<count;  i++,c+=strlen(c)+1 ) {
		words[i] = c;
		values[i] = phonetic(c);
	}

	/* Work through the asserted value's words, to see if at least some
	   of the words are there, in the same order. */
	len = 0;
	while ( (size_t) nextchunk < avlen ) {
		len = strcspn( assertv + nextchunk, SLAPD_APPROX_DELIMITER);
		if( len == 0 ) {
			nextchunk++;
			continue;
		}
#if defined(SLAPD_APPROX_INITIALS)
		else if( len == 1 ) {
			/* Single letter words need to at least match one word's initial */
			for( i=nextavail; i<count; i++ )
				if( !strncasecmp( assertv+nextchunk, words[i], 1 )) {
					nextavail=i+1;
					break;
				}
		}
#endif
		else {
			/* Isolate the next word in the asserted value and phonetic it */
			assertv[nextchunk+len] = '\0';
			val = phonetic( assertv + nextchunk );

			/* See if this phonetic chunk is in the remaining words of *value */
			for( i=nextavail; i<count; i++ ){
				if( !strcmp( val, values[i] ) ){
					nextavail = i+1;
					break;
				}
			}
			ch_free( val );
		}

		/* This chunk in the asserted value was NOT within the *value. */
		if( i >= count ) {
			nextavail=-1;
			break;
		}

		/* Go on to the next word in the asserted value */
		nextchunk += len+1;
	}

	/* If some of the words were seen, call it a match */
	if( nextavail > 0 ) {
		*matchp = 0;
	}
	else {
		*matchp = 1;
	}

	/* Cleanup allocs */
	free( assertv );
	for( i=0; i<count; i++ ) {
		ch_free( values[i] );
	}
	ch_free( values );
	ch_free( words );
	ch_free( nval );

	return LDAP_SUCCESS;
}

static int 
approxIndexer(
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	BerVarray values,
	BerVarray *keysp )
{
	char *val, *c;
	int i,j, len, wordcount, keycount=0;
	struct berval *newkeys;
	BerVarray keys=NULL;

	for( j=0; values[j].bv_val != NULL; j++ ) {
		/* Yes, this is necessary */
		val = UTF8normalize( &values[j], LDAP_UTF8_NOCASEFOLD );
		strip8bitChars( val );

		/* Isolate how many words there are. There will be a key for each */
		for( wordcount=0,c=val;	 *c;  c++) {
			len = strcspn(c, SLAPD_APPROX_DELIMITER);
			if( len >= SLAPD_APPROX_WORDLEN ) wordcount++;
			c+= len;
			if (*c == '\0') break;
			*c = '\0';
		}

		/* Allocate/increase storage to account for new keys */
		newkeys = (struct berval *)ch_malloc( (keycount + wordcount + 1) 
			* sizeof(struct berval) );
		AC_MEMCPY( newkeys, keys, keycount * sizeof(struct berval) );
		if( keys ) ch_free( keys );
		keys = newkeys;

		/* Get a phonetic copy of each word */
		for( c=val,i=0;	 i<wordcount;  c+=len+1	 ) {
			len = strlen( c );
			if( len < SLAPD_APPROX_WORDLEN ) continue;
			ber_str2bv( phonetic( c ), 0, 0, &keys[keycount] );
			keycount++;
			i++;
		}

		free( val );
	}
	keys[keycount].bv_val = NULL;
	*keysp = keys;

	return LDAP_SUCCESS;
}

static int 
approxFilter(
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	void * assertValue,
	BerVarray *keysp )
{
	char *val, *c;
	int i, count, len;
	BerVarray keys;

	/* Yes, this is necessary */
	val = UTF8normalize( ((struct berval *)assertValue),
		LDAP_UTF8_NOCASEFOLD );
	if( val == NULL ) {
		keys = (struct berval *)ch_malloc( sizeof(struct berval) );
		keys[0].bv_val = NULL;
		*keysp = keys;
		return LDAP_SUCCESS;
	}
	strip8bitChars( val );

	/* Isolate how many words there are. There will be a key for each */
	for( count=0,c=val;  *c;  c++) {
		len = strcspn(c, SLAPD_APPROX_DELIMITER);
		if( len >= SLAPD_APPROX_WORDLEN ) count++;
		c+= len;
		if (*c == '\0') break;
		*c = '\0';
	}

	/* Allocate storage for new keys */
	keys = (struct berval *)ch_malloc( (count + 1) * sizeof(struct berval) );

	/* Get a phonetic copy of each word */
	for( c=val,i=0;	 i<count; c+=len+1 ) {
		len = strlen(c);
		if( len < SLAPD_APPROX_WORDLEN ) continue;
		ber_str2bv( phonetic( c ), 0, 0, &keys[i] );
		i++;
	}

	free( val );

	keys[count].bv_val = NULL;
	*keysp = keys;

	return LDAP_SUCCESS;
}


#else
/* No other form of Approximate Matching is defined */

static int
approxMatch(
	int *matchp,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *value,
	void *assertedValue )
{
	char *vapprox, *avapprox;
	char *s, *t;

	/* Yes, this is necessary */
	s = UTF8normalize( value, UTF8_NOCASEFOLD );
	if( s == NULL ) {
		*matchp = 1;
		return LDAP_SUCCESS;
	}

	/* Yes, this is necessary */
	t = UTF8normalize( ((struct berval *)assertedValue),
			   UTF8_NOCASEFOLD );
	if( t == NULL ) {
		free( s );
		*matchp = -1;
		return LDAP_SUCCESS;
	}

	vapprox = phonetic( strip8bitChars( s ) );
	avapprox = phonetic( strip8bitChars( t ) );

	free( s );
	free( t );

	*matchp = strcmp( vapprox, avapprox );

	ch_free( vapprox );
	ch_free( avapprox );

	return LDAP_SUCCESS;
}

static int 
approxIndexer(
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	BerVarray values,
	BerVarray *keysp )
{
	int i;
	BerVarray *keys;
	char *s;

	for( i=0; values[i].bv_val != NULL; i++ ) {
		/* empty - just count them */
	}

	/* we should have at least one value at this point */
	assert( i > 0 );

	keys = (struct berval *)ch_malloc( sizeof( struct berval ) * (i+1) );

	/* Copy each value and run it through phonetic() */
	for( i=0; values[i].bv_val != NULL; i++ ) {
		/* Yes, this is necessary */
		s = UTF8normalize( &values[i], UTF8_NOCASEFOLD );

		/* strip 8-bit chars and run through phonetic() */
		ber_str2bv( phonetic( strip8bitChars( s ) ), 0, 0, &keys[i] );
		free( s );
	}
	keys[i].bv_val = NULL;

	*keysp = keys;
	return LDAP_SUCCESS;
}


static int 
approxFilter(
	slap_mask_t use,
	slap_mask_t flags,
	Syntax *syntax,
	MatchingRule *mr,
	struct berval *prefix,
	void * assertValue,
	BerVarray *keysp )
{
	BerVarray keys;
	char *s;

	keys = (struct berval *)ch_malloc( sizeof( struct berval * ) * 2 );

	/* Yes, this is necessary */
	s = UTF8normalize( ((struct berval *)assertValue),