/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/addr_srch.c */
/*
 * Copyright 1990 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */

#include "k5-int.h"

static size_t
address_count(krb5_address *const *addrlist)
{
    size_t i;

    if (addrlist == NULL)
        return 0;

    for (i = 0; addrlist[i]; i++)
        ;

    return i;
}

/*
 * if addr is listed in addrlist, or addrlist is null, return TRUE.
 * if not listed, return FALSE
 */
krb5_boolean
krb5_address_search(krb5_context context, const krb5_address *addr, krb5_address *const *addrlist)
{
    /*
     * Treat an address list containing only a NetBIOS address
     * as empty, because we presently have no way of associating
     * a client with its NetBIOS address.
     */
    if (address_count(addrlist) == 1 &&
        addrlist[0]->addrtype == ADDRTYPE_NETBIOS)
        return TRUE;
    if (!addrlist)
        return TRUE;
    for (; *addrlist; addrlist++) {
        if (krb5_address_compare(context, addr, *addrlist))
            return TRUE;
    }
    return FALSE;
}