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To: Terry Lambert <tlambert@primenet.com>
Cc: fygrave@freenet.bishkek.su (CyberPsychotic), brian@deity.loa.com,
        freebsd-hackers@FreeBSD.ORG
Subject: Re: bpf
References: <199805091001.DAA27195@usr06.primenet.com>
Organization: Gutteklubben Terrasse / KRST / PUMS / YASMW
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From: dag-erli@ifi.uio.no (Dag-Erling Coidan =?iso-8859-1?Q?Sm=F8rgrav?= )
Date: 09 May 1998 12:37:30 +0200
In-Reply-To: Terry Lambert's message of "Sat, 9 May 1998 10:01:00 +0000 (GMT)"
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Terry Lambert <tlambert@primenet.com> writes:
> > could you please give the sample of BIOCSETIF ioctl call? I think i should
> > ivolve some particular structure or something here, but i checked manual
> > and didn't find any reference 
> Meanwhile, look at the CAP code.  8-|.

Hmmm...

OK, basically you want to do something like this to capture packets:

char bpf_dev[IFNAMSIZ], *buf;
struct ifreq ifr;
int n = 0, fd, len;

/* Find an available BPF device */
do
{
    sprintf(bpf_dev, "/dev/bpf%d", n++);
    fd = open(bpf_dev, O_RDONLY);
}
while (errno == EBUSY);

if (fd < 0) /* it didn't work! */;

/* Get buffer length */
if (ioctl(fd, BIOCGBLEN, &len) < 0) /* ouch */;
if (!(buf = malloc(len))) /* ouch! */;

/* Set interface to ep0 */
bzero(&ifr, sizeof(struct ifreq));
strcpy(ifr.ifr_name, "ep0");
if (ioctl(fd, BIOCSETIF, &ifr) < 0) /* ouch! */;

/* Set immediate mode */
n = 1;
if (ioctl(fd, BIOCIMMEDIATE, &n) < 0) /* ouch! */;

/* Read packets */
while (1)
{
    read(fd, buf, len);
    /* do something nifty with them */
}

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