/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */
/*
 *  Copyright (c) 1990 Regents of the University of Michigan.
 *  All rights reserved.
 */
/*
 *  compare.c
 */

#if 0
#ifndef lint 
static char copyright[] = "@(#) Copyright (c) 1990 Regents of the University of Michigan.\nAll rights reserved.\n";
#endif
#endif

#include "ldap-int.h"

/*
 * ldap_compare - perform an ldap (and X.500) compare operation.  The dn
 * of the entry to compare to and the attribute and value to compare (in
 * attr and value) are supplied.  The msgid of the response is returned.
 *
 * Example:
 *	ldap_compare( ld, "c=us@cn=bob", "userPassword", "secret" )
 */
int
LDAP_CALL
ldap_compare( LDAP *ld, const char *dn, const char *attr, const char *value )
{
	int		msgid;
	struct berval	bv;

	LDAPDebug( LDAP_DEBUG_TRACE, "ldap_compare\n", 0, 0, 0 );

	bv.bv_val = (char *)value;
	bv.bv_len = ( value == NULL ) ? 0 : strlen( value );

	if ( ldap_compare_ext( ld, dn, attr, &bv, NULL, NULL, &msgid )
	    == LDAP_SUCCESS ) {
		return( msgid );
	} else {
		return( -1 );	/* error is in ld handle */
	}
}

int
LDAP_CALL
ldap_compare_ext( LDAP *ld, const char *dn, const char *attr,
    struct berval *bvalue, LDAPControl **serverctrls,
    LDAPControl **clientctrls, int *msgidp )
{
	BerElement	*ber;
	int		rc, lderr; 

	/* The compare request looks like this:
	 *	CompareRequest ::= SEQUENCE {
	 *		entry	DistinguishedName,
	 *		ava	SEQUENCE {
	 *			type	AttributeType,
	 *			value	AttributeValue
	 *		}
	 *	}
	 * and must be wrapped in an LDAPMessage.
	 */

	LDAPDebug( LDAP_DEBUG_TRACE, "ldap_compare_ext\n", 0, 0, 0 );

	if ( !NSLDAPI_VALID_LDAP_POINTER( ld )) {
		return( LDAP_PARAM_ERROR );
	}
	if ( attr == NULL || bvalue == NULL || bvalue->bv_len == 0
	    || msgidp == NULL ) {
		lderr = LDAP_PARAM_ERROR;
		LDAP_SET_LDERRNO( ld, lderr, NULL, NULL );
		return( lderr );
	}
		
	if ( dn == NULL ) {
		dn = "";
	}

	LDAP_MUTEX_LOCK( ld, LDAP_MSGID_LOCK );
	*msgidp = ++ld->ld_msgid;
	LDAP_MUTEX_UNLOCK( ld, LDAP_MSGID_LOCK );

	/* check the cache */
	if ( ld->ld_cache_on && ld->ld_cache_compare != NULL ) {
		LDAP_MUTEX_LOCK( ld, LDAP_CACHE_LOCK );
		if ( (rc = (ld->ld_cache_compare)( ld, *msgidp,
		    LDAP_REQ_COMPARE, dn, attr, bvalue )) != 0 ) {
			*msgidp = rc;
			LDAP_MUTEX_UNLOCK( ld, LDAP_CACHE_LOCK );
			return( LDAP_SUCCESS );
		}
		LDAP_MUTEX_UNLOCK( ld, LDAP_CACHE_LOCK );
	}

	/* create a message to send */
	if (( lderr = nsldapi_alloc_ber_with_options( ld, &ber ))
	    != LDAP_SUCCESS ) {
		return( lderr );
	}

	if ( ber_printf( ber, "{it{s{so}}", *msgidp, LDAP_REQ_COMPARE,
	    dn, attr, bvalue->bv_val, bvalue->bv_len ) == -1 ) {
		lderr = LDAP_ENCODING_ERROR;
		LDAP_SET_LDERRNO( ld, lderr, NULL, NULL );
		ber_free( ber, 1 );
		return( lderr );
	}

	if (( lderr = nsldapi_put_controls( ld, serverctrls, 1, ber ))
	    != LDAP_SUCCESS ) {
		ber_free( ber, 1 );
		return( lderr );
	}

	/* send the message */
	rc = nsldapi_send_initial_request( ld, *msgidp, LDAP_REQ_COMPARE,
		(char *)dn, ber );
	*msgidp = rc;
	return( rc < 0 ? LDAP_GET_LDERRNO( ld, NULL, NULL ) : LDAP_SUCCESS );
}

int
LDAP_CALL
ldap_compare_s( LDAP *ld, const char *dn, const char *attr,
    const char *value )
{
	struct berval	bv;

	bv.bv_val = (char *)value;
	bv.bv_len = ( value == NULL ) ? 0 : strlen( value );

	return( ldap_compare_ext_s( ld, dn, attr, &bv, NULL, NULL ));
}

int
LDAP_CALL
ldap_compare_ext_s( LDAP *ld, const char *dn, const char *attr,
    struct berval *bvalue, LDAPControl **serverctrls,
    LDAPControl **clientctrls ) 
{
	int		err, msgid;
	LDAPMessage	*res;

	if (( err = ldap_compare_ext( ld, dn, attr, bvalue, serverctrls,
	    clientctrls, &msgid )) != LDAP_SUCCESS ) {
		return( err );
	}

	if ( ldap_result( ld, msgid, 1, (struct timeval *)NULL, &res )
	    == -1 ) {
		return( LDAP_GET_LDERRNO( ld, NULL, NULL ) );
	}

	return( ldap_result2error( ld, res, 1 ) );
}