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ethernet_hdr.c

/*
 * author: Darren Bounds <dbounds@intrusense.com>
 * copyright: Copyright (C) 2002 by Darren Bounds
 * license: This software is under GPL version 2 of license
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * 4g8 official page at http://.net
 */

#include "ethernet_hdr.h"

void
ethernet_hdr(struct libnet_ethernet_hdr *ehdr)
{
    u_int8_t mac1_array[6];
    u_int8_t mac2_array[6];

#ifdef DEBUG
    fprintf(stdout, "DEBUG: ethernet_hdr()\n");
#endif

    fprintf(stdout, "Eth header:  Src Address: %0X:%0X:%0X:%0X:%0X:%0X  Dst Address: %0X:%0X:%0X:%0X:%0X:%0X",
        ehdr->ether_shost[0],
        ehdr->ether_shost[1],
        ehdr->ether_shost[2],
        ehdr->ether_shost[3],
        ehdr->ether_shost[4],
        ehdr->ether_shost[5],

        ehdr->ether_dhost[0],
        ehdr->ether_dhost[1],
        ehdr->ether_dhost[2],
        ehdr->ether_dhost[3],
        ehdr->ether_dhost[4],
        ehdr->ether_dhost[5]);

    fprintf(stdout, "\n");

    format_ethernet_addr(host_mac, mac1_array);
    format_ethernet_addr(gw_mac, mac2_array);

    if(mac1_array[3] == ehdr->ether_shost[3] && 
       mac1_array[4] == ehdr->ether_shost[4] && 
       mac1_array[5] == ehdr->ether_shost[5])
    {
        outbound = 0;
    }
    else
        outbound = 1;

    if(libnet_autobuild_ethernet(
        (outbound == 1) ? mac1_array : mac2_array,
        ETHERTYPE_IP,
        pkt_d) == -1)
    {
        fatal_error("Unable to build ethernet header");
    }

    return;
}

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