/*
 * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * For additional information see http://www.ethernut.de/
 *
 * -
 * Portions Copyright (c) 1983, 1993 by
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * -
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * $Log$
 * Revision 1.2  2005/11/03 15:02:34  haraldkipp
 * Make use of the new memset/memcpy routines.
 *
 * Revision 1.1  2003/11/03 16:19:38  haraldkipp
 * First release
 *
 */

#include <string.h>

#include <avr/io.h>

#include "debug.h"
#include "appload.h"
#include "ip.h"
#include "arp.h"

/*!
 * \addtogroup xgStack
 */
/*@{*/

u_long arptab_ip;               /*!< \brief IP address. */
u_char arptab_ha[6];            /*!< \brief Hardware address. */

ARPFRAME arpframe;

/*!
 * \brief Request the MAC address of a specified IP address.
 *
 * \param dip  IP address in network byte order.
 * \param dmac Points to the buffer, that will receive the MAC address.
 *
 * \return 0 on success, -1 otherwise.
 */
int ArpRequest(u_long dip, u_char * dmac)
{
    ETHERARP *ea = &arpframe.eth_arp;
    u_char retry;
    int rlen;

    memset_(dmac, 0xFF, 6);
    if (dip == INADDR_BROADCAST) {
        return 0;
    }

    if (dip == arptab_ip) {
        memcpy_(dmac, arptab_ha, 6);
        return 0;
    }

    /*
     * Set ARP header.
     */
    ea->arp_hrd = ARPHRD_ETHER;
    ea->arp_pro = ETHERTYPE_IP;
    ea->arp_hln = 6;
    ea->arp_pln = 4;
    ea->arp_op = ARPOP_REQUEST;
    memcpy_(ea->arp_sha, confnet.cdn_mac, 6);
    memset_(ea->arp_tha, 0xFF, 6);
    ea->arp_spa = confnet.cdn_ip_addr;
    ea->arp_tpa = dip;


    ea = &(((ARPFRAME *) & rframe)->eth_arp);
    for (rlen = retry = 0; retry < 3;) {
        /*
         * Send a message, if nothing has been received yet.
         */
        if (rlen == 0) {
            /* Transmit failure, must be a NIC problem. Give up. */
            if (EtherOutput(dmac, ETHERTYPE_ARP, sizeof(ETHERARP)) < 0)
                break;
        }
        if ((rlen = EtherInput(ETHERTYPE_ARP, 1000)) <= 0) {
            retry++;
            continue;
        }

        /*
         * Check if the response contains the expected values.
         */
        if (ea->arp_tpa == confnet.cdn_ip_addr && ea->arp_op == ARPOP_REPLY && ea->arp_spa == dip) {
            arptab_ip = dip;
            memcpy_(arptab_ha, ea->arp_sha, 6);
            memcpy_(dmac, ea->arp_sha, 6);
            return 0;
        }
    }
    return -1;
}

/*@}*/
