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/* pcapfunc.c pcap related routines
*
* ipband - network bandwidth watchdog
* By Andrew Nevynniy <anevynni@russelmetals.com>
*
* 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 "ipband.h"
void open_interface (int promisc) {
struct bpf_program fcode;
char ebuf[PCAP_ERRBUF_SIZE];
pcapfile_m = pcap_open_live(pcapdev_m, PLEN, promisc, 1000, ebuf);
if (pcapfile_m==NULL) {
printf("ipband: Trouble opening <%s>, msg=\"%s\"\n",
pcapdev_m, ebuf);
exit(1);
}
/* Find IP header offset */
pcapoffset_m = get_packetoffset(pcap_datalink(pcapfile_m));
/* Apply user requested packet filter code */
if (pcap_compile(pcapfile_m, &fcode, filtercmd_m, 0, 0) < 0)
printf("compile: %s", pcap_geterr(pcapfile_m));
if (pcap_setfilter(pcapfile_m, &fcode) < 0)
printf("setfilter: %s", pcap_geterr(pcapfile_m));
/* Problem with pcap_setfilter? Sets error, unset here */
errno = 0;
}
/* Return IP header offset depending on the interface type */
int get_packetoffset (int DataLinkType) {
int PacketOffset;
switch (DataLinkType) {
case DLT_EN10MB:
case DLT_IEEE802:
PacketOffset = POFF_ETH;
break;
case DLT_PPP:
PacketOffset = POFF_PPP;
break;
case DLT_RAW:
PacketOffset = POFF_RAW;
break;
/* For others we guess */
default:
PacketOffset = 0;
}
return PacketOffset;
}
/* Prints datalink type */
void print_datalink() {
printf ("Interface (%s) ", pcapdev_m);
switch (pcap_datalink(pcapfile_m)) {
case DLT_EN10MB: printf ("DataLinkType = %s\n", "DLT_EN10MB"); break;
case DLT_IEEE802: printf ("DataLinkType = %s\n", "DLT_IEEE802"); break;
case DLT_SLIP: printf ("DataLinkType = %s\n", "DLT_SLIP"); break;
case DLT_SLIP_BSDOS: printf ("DataLinkType = %s\n", "DLT_SLIP_BSDOS"); break;
case DLT_PPP: printf ("DataLinkType = %s\n", "DLT_PPP"); break;
case DLT_PPP_BSDOS: printf ("DataLinkType = %s\n", "DLT_PPP_BSDOS"); break;
case DLT_FDDI: printf ("DataLinkType = %s\n", "DLT_FDDI"); break;
case DLT_NULL: printf ("DataLinkType = %s\n", "DLT_NULL"); break;
case DLT_RAW: printf ("DataLinkType = %s\n", "DLT_RAW"); break;
case DLT_ATM_RFC1483: printf ("DataLinkType = %s\n", "DLT_ATM_RFC1483"); break;
default: printf ("DataLinkType = %d\n", pcap_datalink(pcapfile_m));
}
printf("\n");
}
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