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diff --git a/servers/slapd/attr.c b/servers/slapd/attr.c
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+/* attr.c - routines for dealing with attributes */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 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>
+
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#include <ac/ctype.h>
+#include <ac/errno.h>
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/time.h>
+
+#include "slap.h"
+
+/*
+ * Allocate in chunks, minimum of 1000 at a time.
+ */
+#define CHUNK_SIZE 1000
+typedef struct slap_list {
+ struct slap_list *next;
+} slap_list;
+static slap_list *attr_chunks;
+static Attribute *attr_list;
+static ldap_pvt_thread_mutex_t attr_mutex;
+
+int
+attr_prealloc( int num )
+{
+ Attribute *a;
+ slap_list *s;
+
+ if (!num) return 0;
+
+ s = ch_calloc( 1, sizeof(slap_list) + num * sizeof(Attribute));
+ s->next = attr_chunks;
+ attr_chunks = s;
+
+ a = (Attribute *)(s+1);
+ for ( ;num>1; num--) {
+ a->a_next = a+1;
+ a++;
+ }
+ a->a_next = attr_list;
+ attr_list = (Attribute *)(s+1);
+
+ return 0;
+}
+
+Attribute *
+attr_alloc( AttributeDescription *ad )
+{
+ Attribute *a;
+
+ ldap_pvt_thread_mutex_lock( &attr_mutex );
+ if ( !attr_list )
+ attr_prealloc( CHUNK_SIZE );
+ a = attr_list;
+ attr_list = a->a_next;
+ a->a_next = NULL;
+ ldap_pvt_thread_mutex_unlock( &attr_mutex );
+
+ a->a_desc = ad;
+ if ( ad && ( ad->ad_type->sat_flags & SLAP_AT_SORTED_VAL ))
+ a->a_flags |= SLAP_ATTR_SORTED_VALS;
+
+ return a;
+}
+
+/* Return a list of num attrs */
+Attribute *
+attrs_alloc( int num )
+{
+ Attribute *head = NULL;
+ Attribute **a;
+
+ ldap_pvt_thread_mutex_lock( &attr_mutex );
+ for ( a = &attr_list; *a && num > 0; a = &(*a)->a_next ) {
+ if ( !head )
+ head = *a;
+ num--;
+ }
+ attr_list = *a;
+ if ( num > 0 ) {
+ attr_prealloc( num > CHUNK_SIZE ? num : CHUNK_SIZE );
+ *a = attr_list;
+ for ( ; *a && num > 0; a = &(*a)->a_next ) {
+ if ( !head )
+ head = *a;
+ num--;
+ }
+ attr_list = *a;
+ }
+ *a = NULL;
+ ldap_pvt_thread_mutex_unlock( &attr_mutex );
+
+ return head;
+}
+
+
+void
+attr_clean( Attribute *a )
+{
+ if ( a->a_nvals && a->a_nvals != a->a_vals &&
+ !( a->a_flags & SLAP_ATTR_DONT_FREE_VALS )) {
+ if ( a->a_flags & SLAP_ATTR_DONT_FREE_DATA ) {
+ free( a->a_nvals );
+ } else {
+ ber_bvarray_free( a->a_nvals );
+ }
+ }
+ /* a_vals may be equal to slap_dummy_bv, a static empty berval;
+ * this is used as a placeholder for attributes that do not carry
+ * values, e.g. when proxying search entries with the "attrsonly"
+ * bit set. */
+ if ( a->a_vals != &slap_dummy_bv &&
+ !( a->a_flags & SLAP_ATTR_DONT_FREE_VALS )) {
+ if ( a->a_flags & SLAP_ATTR_DONT_FREE_DATA ) {
+ free( a->a_vals );
+ } else {
+ ber_bvarray_free( a->a_vals );
+ }
+ }
+ a->a_desc = NULL;
+ a->a_vals = NULL;
+ a->a_nvals = NULL;
+#ifdef LDAP_COMP_MATCH
+ a->a_comp_data = NULL;
+#endif
+ a->a_flags = 0;
+ a->a_numvals = 0;
+}
+
+void
+attr_free( Attribute *a )
+{
+ attr_clean( a );
+ ldap_pvt_thread_mutex_lock( &attr_mutex );
+ a->a_next = attr_list;
+ attr_list = a;
+ ldap_pvt_thread_mutex_unlock( &attr_mutex );
+}
+
+#ifdef LDAP_COMP_MATCH
+void
+comp_tree_free( Attribute *a )
+{
+ Attribute *next;
+
+ for( ; a != NULL ; a = next ) {
+ next = a->a_next;
+ if ( component_destructor && a->a_comp_data ) {
+ if ( a->a_comp_data->cd_mem_op )
+ component_destructor( a->a_comp_data->cd_mem_op );
+ free ( a->a_comp_data );
+ }
+ }
+}
+#endif
+
+void
+attrs_free( Attribute *a )
+{
+ if ( a ) {
+ Attribute *b = (Attribute *)0xBAD, *tail, *next;
+
+ /* save tail */
+ tail = a;
+ do {
+ next = a->a_next;
+ attr_clean( a );
+ a->a_next = b;
+ b = a;
+ a = next;
+ } while ( next );
+
+ ldap_pvt_thread_mutex_lock( &attr_mutex );
+ /* replace NULL with current attr list and let attr list
+ * start from last attribute returned to list */
+ tail->a_next = attr_list;
+ attr_list = b;
+ ldap_pvt_thread_mutex_unlock( &attr_mutex );
+ }
+}
+
+static void
+attr_dup2( Attribute *tmp, Attribute *a )
+{
+ tmp->a_flags = a->a_flags & SLAP_ATTR_PERSISTENT_FLAGS;
+ if ( a->a_vals != NULL ) {
+ unsigned i, j;
+
+ tmp->a_numvals = a->a_numvals;
+ tmp->a_vals = ch_malloc( (tmp->a_numvals + 1) * sizeof(struct berval) );
+ for ( i = 0; i < tmp->a_numvals; i++ ) {
+ ber_dupbv( &tmp->a_vals[i], &a->a_vals[i] );
+ if ( BER_BVISNULL( &tmp->a_vals[i] ) ) break;
+ /* FIXME: error? */
+ }
+ BER_BVZERO( &tmp->a_vals[i] );
+
+ /* a_nvals must be non null; it may be equal to a_vals */
+ assert( a->a_nvals != NULL );
+
+ if ( a->a_nvals != a->a_vals ) {
+
+ tmp->a_nvals = ch_malloc( (tmp->a_numvals + 1) * sizeof(struct berval) );
+ j = 0;
+ if ( i ) {
+ for ( ; !BER_BVISNULL( &a->a_nvals[j] ); j++ ) {
+ assert( j < i );
+ ber_dupbv( &tmp->a_nvals[j], &a->a_nvals[j] );
+ if ( BER_BVISNULL( &tmp->a_nvals[j] ) ) break;
+ /* FIXME: error? */
+ }
+ assert( j == i );
+ }
+ BER_BVZERO( &tmp->a_nvals[j] );
+
+ } else {
+ tmp->a_nvals = tmp->a_vals;
+ }
+ }
+}
+
+Attribute *
+attr_dup( Attribute *a )
+{
+ Attribute *tmp;
+
+ if ( a == NULL) return NULL;
+
+ tmp = attr_alloc( a->a_desc );
+ attr_dup2( tmp, a );
+ return tmp;
+}
+
+Attribute *
+attrs_dup( Attribute *a )
+{
+ int i;
+ Attribute *tmp, *anew;
+
+ if( a == NULL ) return NULL;
+
+ /* count them */
+ for( tmp=a,i=0; tmp; tmp=tmp->a_next ) {
+ i++;
+ }
+
+ anew = attrs_alloc( i );
+
+ for( tmp=anew; a; a=a->a_next ) {
+ tmp->a_desc = a->a_desc;
+ attr_dup2( tmp, a );
+ tmp=tmp->a_next;
+ }
+
+ return anew;
+}
+
+int
+attr_valfind(
+ Attribute *a,
+ unsigned flags,
+ struct berval *val,
+ unsigned *slot,
+ void *ctx )
+{
+ struct berval nval = BER_BVNULL, *cval;
+ MatchingRule *mr;
+ const char *text;
+ int match = -1, rc;
+ unsigned i, n;
+
+ if ( flags & SLAP_MR_ORDERING )
+ mr = a->a_desc->ad_type->sat_ordering;
+ else
+ mr = a->a_desc->ad_type->sat_equality;
+
+ if( !SLAP_IS_MR_ASSERTED_VALUE_NORMALIZED_MATCH( flags ) &&
+ mr->smr_normalize )
+ {
+ rc = (mr->smr_normalize)(
+ flags & (SLAP_MR_TYPE_MASK|SLAP_MR_SUBTYPE_MASK|SLAP_MR_VALUE_OF_SYNTAX),
+ a->a_desc->ad_type->sat_syntax,
+ mr, val, &nval, ctx );
+
+ if( rc != LDAP_SUCCESS ) {
+ return LDAP_INVALID_SYNTAX;
+ }
+ cval = &nval;
+ } else {
+ cval = val;
+ }
+
+ n = a->a_numvals;
+ if ( (a->a_flags & SLAP_ATTR_SORTED_VALS) && n ) {
+ /* Binary search */
+ unsigned base = 0;
+
+ do {
+ unsigned pivot = n >> 1;
+ i = base + pivot;
+ rc = value_match( &match, a->a_desc, mr, flags,
+ &a->a_nvals[i], cval, &text );
+ if ( rc == LDAP_SUCCESS && match == 0 )
+ break;
+ if ( match < 0 ) {
+ base = i+1;
+ n -= pivot+1;
+ } else {
+ n = pivot;
+ }
+ } while ( n );
+ if ( match < 0 )
+ i++;
+ } else {
+ /* Linear search */
+ for ( i = 0; i < n; i++ ) {
+ const char *text;
+
+ rc = ordered_value_match( &match, a->a_desc, mr, flags,
+ &a->a_nvals[i], cval, &text );
+ if ( rc == LDAP_SUCCESS && match == 0 )
+ break;
+ }
+ }
+ if ( match )
+ rc = LDAP_NO_SUCH_ATTRIBUTE;
+ if ( slot )
+ *slot = i;
+ if ( nval.bv_val )
+ slap_sl_free( nval.bv_val, ctx );
+
+ return rc;
+}
+
+int
+attr_valadd(
+ Attribute *a,
+ BerVarray vals,
+ BerVarray nvals,
+ int nn )
+{
+ int i;
+ BerVarray v2;
+
+ v2 = (BerVarray) SLAP_REALLOC( (char *) a->a_vals,
+ (a->a_numvals + nn + 1) * sizeof(struct berval) );
+ if( v2 == NULL ) {
+ Debug(LDAP_DEBUG_TRACE,
+ "attr_valadd: SLAP_REALLOC failed.\n", 0, 0, 0 );
+ return LBER_ERROR_MEMORY;
+ }
+ a->a_vals = v2;
+ if ( nvals ) {
+ v2 = (BerVarray) SLAP_REALLOC( (char *) a->a_nvals,
+ (a->a_numvals + nn + 1) * sizeof(struct berval) );
+ if( v2 == NULL ) {
+ Debug(LDAP_DEBUG_TRACE,
+ "attr_valadd: SLAP_REALLOC failed.\n", 0, 0, 0 );
+ return LBER_ERROR_MEMORY;
+ }
+ a->a_nvals = v2;
+ } else {
+ a->a_nvals = a->a_vals;
+ }
+
+ /* If sorted and old vals exist, must insert */
+ if (( a->a_flags & SLAP_ATTR_SORTED_VALS ) && a->a_numvals ) {
+ unsigned slot;
+ int j, rc;
+ v2 = nvals ? nvals : vals;
+ for ( i = 0; i < nn; i++ ) {
+ rc = attr_valfind( a, SLAP_MR_EQUALITY | SLAP_MR_VALUE_OF_ASSERTION_SYNTAX |
+ SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH | SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH,
+ &v2[i], &slot, NULL );
+ if ( rc != LDAP_NO_SUCH_ATTRIBUTE ) {
+ /* should never happen */
+ if ( rc == LDAP_SUCCESS )
+ rc = LDAP_TYPE_OR_VALUE_EXISTS;
+ return rc;
+ }
+ for ( j = a->a_numvals; j >= (int)slot; j-- ) {
+ a->a_vals[j+1] = a->a_vals[j];
+ if ( nvals )
+ a->a_nvals[j+1] = a->a_nvals[j];
+ }
+ ber_dupbv( &a->a_nvals[slot], &v2[i] );
+ if ( nvals )
+ ber_dupbv( &a->a_vals[slot], &vals[i] );
+ a->a_numvals++;
+ }
+ BER_BVZERO( &a->a_vals[a->a_numvals] );
+ if ( a->a_vals != a->a_nvals )
+ BER_BVZERO( &a->a_nvals[a->a_numvals] );
+ } else {
+ v2 = &a->a_vals[a->a_numvals];
+ for ( i = 0 ; i < nn; i++ ) {
+ ber_dupbv( &v2[i], &vals[i] );
+ if ( BER_BVISNULL( &v2[i] ) ) break;
+ }
+ BER_BVZERO( &v2[i] );
+
+ if ( nvals ) {
+ v2 = &a->a_nvals[a->a_numvals];
+ for ( i = 0 ; i < nn; i++ ) {
+ ber_dupbv( &v2[i], &nvals[i] );
+ if ( BER_BVISNULL( &v2[i] ) ) break;
+ }
+ BER_BVZERO( &v2[i] );
+ }
+ a->a_numvals += i;
+ }
+ return 0;
+}
+
+/*
+ * attr_merge - merge the given type and value with the list of
+ * attributes in attrs.
+ *
+ * nvals must be NULL if the attribute has no normalizer.
+ * In this case, a->a_nvals will be set equal to a->a_vals.
+ *
+ * returns 0 everything went ok
+ * -1 trouble
+ */
+
+int
+attr_merge(
+ Entry *e,
+ AttributeDescription *desc,
+ BerVarray vals,
+ BerVarray nvals )
+{
+ int i = 0;
+
+ Attribute **a;
+
+ for ( a = &e->e_attrs; *a != NULL; a = &(*a)->a_next ) {
+ if ( (*a)->a_desc == desc ) {
+ break;
+ }
+ }
+
+ if ( *a == NULL ) {
+ *a = attr_alloc( desc );
+ } else {
+ /*
+ * FIXME: if the attribute already exists, the presence
+ * of nvals and the value of (*a)->a_nvals must be consistent
+ */
+ assert( ( nvals == NULL && (*a)->a_nvals == (*a)->a_vals )
+ || ( nvals != NULL && (
+ ( (*a)->a_vals == NULL && (*a)->a_nvals == NULL )
+ || ( (*a)->a_nvals != (*a)->a_vals ) ) ) );
+ }
+
+ if ( vals != NULL ) {
+ for ( ; !BER_BVISNULL( &vals[i] ); i++ ) ;
+ }
+ return attr_valadd( *a, vals, nvals, i );
+}
+
+/*
+ * if a normalization function is defined for the equality matchingRule
+ * of desc, the value is normalized and stored in nval; otherwise nval
+ * is NULL
+ */
+int
+attr_normalize(
+ AttributeDescription *desc,
+ BerVarray vals,
+ BerVarray *nvalsp,
+ void *memctx )
+{
+ int rc = LDAP_SUCCESS;
+ BerVarray nvals = NULL;
+
+ *nvalsp = NULL;
+
+ if ( desc->ad_type->sat_equality &&
+ desc->ad_type->sat_equality->smr_normalize )
+ {
+ int i;
+
+ for ( i = 0; !BER_BVISNULL( &vals[i] ); i++ );
+
+ nvals = slap_sl_calloc( sizeof(struct berval), i + 1, memctx );
+ for ( i = 0; !BER_BVISNULL( &vals[i] ); i++ ) {
+ rc = desc->ad_type->sat_equality->smr_normalize(
+ SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
+ desc->ad_type->sat_syntax,
+ desc->ad_type->sat_equality,
+ &vals[i], &nvals[i], memctx );
+
+ if ( rc != LDAP_SUCCESS ) {
+ BER_BVZERO( &nvals[i + 1] );
+ break;
+ }
+ }
+ BER_BVZERO( &nvals[i] );
+ *nvalsp = nvals;
+ }
+
+ if ( rc != LDAP_SUCCESS && nvals != NULL ) {
+ ber_bvarray_free_x( nvals, memctx );
+ }
+
+ return rc;
+}
+
+int
+attr_merge_normalize(
+ Entry *e,
+ AttributeDescription *desc,
+ BerVarray vals,
+ void *memctx )
+{
+ BerVarray nvals = NULL;
+ int rc;
+
+ rc = attr_normalize( desc, vals, &nvals, memctx );
+ if ( rc == LDAP_SUCCESS ) {
+ rc = attr_merge( e, desc, vals, nvals );
+ if ( nvals != NULL ) {
+ ber_bvarray_free_x( nvals, memctx );
+ }
+ }
+
+ return rc;
+}
+
+int
+attr_merge_one(
+ Entry *e,
+ AttributeDescription *desc,
+ struct berval *val,
+ struct berval *nval )
+{
+ Attribute **a;
+
+ for ( a = &e->e_attrs; *a != NULL; a = &(*a)->a_next ) {
+ if ( (*a)->a_desc == desc ) {
+ break;
+ }
+ }
+
+ if ( *a == NULL ) {
+ *a = attr_alloc( desc );
+ }
+
+ return attr_valadd( *a, val, nval, 1 );
+}
+
+/*
+ * if a normalization function is defined for the equality matchingRule
+ * of desc, the value is normalized and stored in nval; otherwise nval
+ * is NULL
+ */
+int
+attr_normalize_one(
+ AttributeDescription *desc,
+ struct berval *val,
+ struct berval *nval,
+ void *memctx )
+{
+ int rc = LDAP_SUCCESS;
+
+ BER_BVZERO( nval );
+
+ if ( desc->ad_type->sat_equality &&
+ desc->ad_type->sat_equality->smr_normalize )
+ {
+ rc = desc->ad_type->sat_equality->smr_normalize(
+ SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
+ desc->ad_type->sat_syntax,
+ desc->ad_type->sat_equality,
+ val, nval, memctx );
+
+ if ( rc != LDAP_SUCCESS ) {
+ return rc;
+ }
+ }
+
+ return rc;
+}
+
+int
+attr_merge_normalize_one(
+ Entry *e,
+ AttributeDescription *desc,
+ struct berval *val,
+ void *memctx )
+{
+ struct berval nval = BER_BVNULL;
+ struct berval *nvalp = NULL;
+ int rc;
+
+ rc = attr_normalize_one( desc, val, &nval, memctx );
+ if ( rc == LDAP_SUCCESS && !BER_BVISNULL( &nval ) ) {
+ nvalp = &nval;
+ }
+
+ rc = attr_merge_one( e, desc, val, nvalp );
+ if ( nvalp != NULL ) {
+ slap_sl_free( nval.bv_val, memctx );
+ }
+ return rc;
+}
+
+/*
+ * attrs_find - find attribute(s) by AttributeDescription
+ * returns next attribute which is subtype of provided description.
+ */
+
+Attribute *
+attrs_find(
+ Attribute *a,
+ AttributeDescription *desc )
+{
+ for ( ; a != NULL; a = a->a_next ) {
+ if ( is_ad_subtype( a->a_desc, desc ) ) {
+ return( a );
+ }
+ }
+
+ return( NULL );
+}
+
+/*
+ * attr_find - find attribute by type
+ */
+
+Attribute *
+attr_find(
+ Attribute *a,
+ AttributeDescription *desc )
+{
+ for ( ; a != NULL; a = a->a_next ) {
+ if ( a->a_desc == desc ) {
+ return( a );
+ }
+ }
+
+ return( NULL );
+}
+
+/*
+ * attr_delete - delete the attribute type in list pointed to by attrs
+ * return 0 deleted ok
+ * 1 not found in list a
+ * -1 something bad happened
+ */
+
+int
+attr_delete(
+ Attribute **attrs,
+ AttributeDescription *desc )
+{
+ Attribute **a;
+
+ for ( a = attrs; *a != NULL; a = &(*a)->a_next ) {
+ if ( (*a)->a_desc == desc ) {
+ Attribute *save = *a;
+ *a = (*a)->a_next;
+ attr_free( save );
+
+ return LDAP_SUCCESS;
+ }
+ }
+
+ return LDAP_NO_SUCH_ATTRIBUTE;
+}
+
+int
+attr_init( void )
+{
+ ldap_pvt_thread_mutex_init( &attr_mutex );
+ return 0;
+}
+
+int
+attr_destroy( void )
+{
+ slap_list *a;
+
+ for ( a=attr_chunks; a; a=attr_chunks ) {
+ attr_chunks = a->next;
+ free( a );
+ }
+ ldap_pvt_thread_mutex_destroy( &attr_mutex );
+ return 0;
+}
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