eth.c

Nast是一个基于Libnet 和Libpcap的sniffer包和LAN分析器。它可以在通常模式或混合模式下检查通过网络接口的数据包

/*
    Pktsant -

    Copyright (C) 2002  Snifth

    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.


*/

#include "include/nast.h"

/* handle ethernet header */
u_int16_t handle_ethernet (u_char *packet)
{
    struct libnet_ethernet_hdr *eptr;  /* net/ethernet.h */
    u_short ether_type;

    eptr = (struct libnet_ethernet_hdr *) packet;
    ether_type = ntohs (eptr->ether_type);

    return ether_type;
}