/*
 * Copyright (c) 2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation. Portions created by Netscape are
 * Copyright (C) 1998-1999 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s):
 */
/*
 *  referral.c - routines for handling LDAPv3 referrals and references.
 */

#include "ldap-int.h"


LDAPMessage *
LDAP_CALL
ldap_first_reference( LDAP *ld, LDAPMessage *res )
{
        if ( !NSLDAPI_VALID_LDAP_POINTER( ld ) || res == NULLMSG ) {
                return( NULLMSG );
        }

        if ( res->lm_msgtype == LDAP_RES_SEARCH_REFERENCE ) {
                return( res );
        }

        return( ldap_next_reference( ld, res ));
}


LDAPMessage *
LDAP_CALL
ldap_next_reference( LDAP *ld, LDAPMessage *ref )
{
        if ( !NSLDAPI_VALID_LDAP_POINTER( ld ) || ref == NULLMSG ) {
                return( NULLMSG );              /* punt */
        }

        for ( ref = ref->lm_chain; ref != NULLMSG; ref = ref->lm_chain ) {
                if ( ref->lm_msgtype == LDAP_RES_SEARCH_REFERENCE ) {
                        return( ref );
                }
        }

        return( NULLMSG );
}


int
LDAP_CALL
ldap_count_references( LDAP *ld, LDAPMessage *res )
{
        int     i;

        if ( !NSLDAPI_VALID_LDAP_POINTER( ld )) {
                return( -1 );
        }

        for ( i = 0; res != NULL; res = res->lm_chain ) {
                if ( res->lm_msgtype == LDAP_RES_SEARCH_REFERENCE ) {
                        ++i;
                }
        }

        return( i );
}


/*
 * returns an LDAP error code.
 */
int
LDAP_CALL
ldap_parse_reference( LDAP *ld, LDAPMessage *ref, char ***referralsp,
    LDAPControl ***serverctrlsp, int freeit )
{
        int             err;

        if ( !NSLDAPI_VALID_LDAP_POINTER( ld ) ||
            !NSLDAPI_VALID_LDAPMESSAGE_REFERENCE_POINTER( ref )) {
                return( LDAP_PARAM_ERROR );
        }

        err = nsldapi_parse_reference( ld, ref->lm_ber, referralsp,
                serverctrlsp );

        LDAP_SET_LDERRNO( ld, err, NULL, NULL );

        if ( freeit ) {
                ldap_msgfree( ref );
        }

        return( err );
}


/*
 * returns an LDAP error code indicating success or failure of parsing
 * does NOT set any error information inside "ld"
 */
int
nsldapi_parse_reference( LDAP *ld, BerElement *rber, char ***referralsp,
    LDAPControl ***serverctrlsp )
{
        int             err;
        BerElement      ber;
        char            **refs;

        /*
         * Parse a searchResultReference message.  These are used in LDAPv3
         * and beyond and look like this:
         *
         *      SearchResultReference ::= [APPLICATION 19] SEQUENCE OF LDAPURL
         *
         * all wrapped up in an LDAPMessage sequence which looks like this:
         *
         *      LDAPMessage ::= SEQUENCE {
         *              messageID       MessageID,
         *              SearchResultReference
         *              controls        [0] Controls OPTIONAL
         *      }
         *
         * ldap_result() pulls out the message id, so by the time a result
         * message gets here we are conveniently sitting at the start of the
         * SearchResultReference itself.
         */
        err = LDAP_SUCCESS;     /* optimistic */
        ber = *rber;            /* struct copy */

        if ( ber_scanf( &ber, "{v", &refs ) == LBER_ERROR ) {
            err = LDAP_DECODING_ERROR;
        } else if ( serverctrlsp != NULL ) {
            /* pull out controls (if requested and any are present) */
            if ( ber_scanf( &ber, "}" ) == LBER_ERROR ) {
                err = LDAP_DECODING_ERROR;
            } else {
                err = nsldapi_get_controls( &ber, serverctrlsp );
            }
        }

        if ( referralsp == NULL ) {
            ldap_value_free( refs );
        } else {
            *referralsp = refs;
        }

        return( err );
}

#ifdef _SOLARIS_SDK

char ** ldap_get_reference_urls(LDAP *ld, LDAPMessage *res)
{
        BerElement tmp;
        char **urls = NULL;

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

        if (res == NULL){
                ld->ld_errno = LDAP_PARAM_ERROR;
                return (NULL);
        }
        tmp = *res->lm_ber; /* struct copy */
        if ( ber_scanf( &tmp, "{v}", &urls) == LBER_ERROR){
                ld->ld_errno = LDAP_DECODING_ERROR;
                return (NULL);
        }
        return (urls);
}

#endif /* _SOLARIS_SDK */