Re: Anyone using xosview?

[Martin Husemann <martin%duskware.de@localhost>]

On Sat, Mar 14, 2015 at 09:08:00PM +0100, Benny Siegert wrote:
> When I launch xosview on NetBSD-7, I get:
> 
> xosview: !!! The kernel does not seem to have the symbols needed for
> the NetMeter.
> xosview: !!! The NetMeter has been disabled.

It tries to kvm_read the interface list in old tailq format starting at
_ifnet.

It should instead do ioctl(SIOCGIFDATA) for every interface name found
in the list returned by if_nameindex(3) - much simpler, no kvm needed.

Martin

--8<--
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <machine/int_fmtio.h>

int main(int argc, char **argv)
{
	struct ifdatareq ifdr;
	const struct if_data *ifi;
	struct if_nameindex *p, * iflist = if_nameindex();
	int s = socket(AF_LOCAL, SOCK_DGRAM, 0);

	for (p = iflist; p->if_index > 0; p++) {
		memset(&ifdr, 0, sizeof(ifdr));
		strcpy(ifdr.ifdr_name, p->if_name);
		if (ioctl(s, SIOCGIFDATA, &ifdr) == -1) {
			fprintf(stderr, "failed: %s\n", p->if_name);
			return 1;
		}
		ifi = &ifdr.ifdr_data;
		printf("%s in: %"PRIu64" out %"PRIu64"\n", ifdr.ifdr_name, ifi->ifi_ibytes,
		    ifi->ifi_obytes);
	}

	close(s);
	if_freenameindex(iflist);
	return 0;
}