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/*
* pcaputil.c
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
* $Id: pcaputil.c,v 1.8 2002/02/25 06:21:59 dugsong Exp $
*/
#include "config.h"
#ifndef WIN32
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#endif
#include <pcap.h>
#ifdef notyet
# include <pcap-int.h>
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pcaputil.h"
pcap_t *
pcap_open(char *device)
{
char ebuf[PCAP_ERRBUF_SIZE];
pcap_t *pcap;
if (device == NULL) {
if ((device = pcap_lookupdev(ebuf)) == NULL)
return (NULL);
}
if ((pcap = pcap_open_live(device, 31337, 0, 10, ebuf)) == NULL)
return (NULL);
#ifdef BSD
{
int n = 1;
if (ioctl(pcap_fileno(pcap), BIOCIMMEDIATE, &n) < 0) {
pcap_close(pcap);
return (NULL);
}
}
#endif
return (pcap);
}
int
pcap_dloff(pcap_t *pd)
{
int i;
i = pcap_datalink(pd);
switch (i) {
case DLT_EN10MB:
i = 14;
break;
case DLT_IEEE802:
i = 22;
break;
case DLT_FDDI:
i = 21;
break;
#ifdef DLT_LOOP
case DLT_LOOP:
#endif
case DLT_NULL:
i = 4;
break;
default:
i = -1;
break;
}
return (i);
}
int
pcap_filter(pcap_t *pcap, const char *fmt, ...)
{
struct bpf_program fcode;
char buf[BUFSIZ];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
#ifdef notyet
pcap_freecode(&pcap->fcode);
#endif
if (pcap_compile(pcap, &fcode, buf, 1, 0) < 0)
return (-1);
if (pcap_setfilter(pcap, &fcode) == -1)
return (-1);
return (0);
}
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