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/*
nast
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"
/* Find pcap_datalink */
int device (char *dev, pcap_t* descr)
{
char errbuf[PCAP_ERRBUF_SIZE];
u_short off;
off = 0;
if ((datalink = pcap_datalink(descr)) < 0)
{
w_error(1, "Error: pcap_datalink: %s\n", errbuf);
}
switch (datalink)
{
case DLT_EN10MB:
off = 14;
break;
case DLT_NULL:
case DLT_PPP:
off = 4;
break;
/*for OpenBSD. If this offset doesn't work change it in 108*/
case DLT_LOOP:
off=12;
break;
case DLT_SLIP:
off = 16;
break;
case DLT_RAW:
off = 0;
break;
case DLT_SLIP_BSDOS:
case DLT_PPP_BSDOS:
off = 24;
break;
case DLT_FDDI:
off = 21;
break;
case DLT_LINUX_SLL:
off = 16;
break;
default:
w_error(1, "Error: Unknown Datalink Type: (%d)\n", datalink);
}
return(off);
}
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