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Don't give up just because inet6 sysctl knobs aren't available

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It can happen normally, for example run a kernel without INET6 or
run a rump_server without librumpnet_netinet6.so.
This commit is contained in:
ozaki-r 2017-01-10 05:43:27 +00:00
parent a94a205118
commit 26e6c607e9
1 changed files with 14 additions and 4 deletions
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16
usr.sbin/ifmcstat/ifmcstat.c
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@ -1,4 +1,4 @@
/* $NetBSD: ifmcstat.c,v 1.19 2014/06/13 16:04:41 joerg Exp $ */
/* $NetBSD: ifmcstat.c,v 1.20 2017/01/10 05:43:27 ozaki-r Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -29,7 +29,7 @@
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: ifmcstat.c,v 1.19 2014/06/13 16:04:41 joerg Exp $");
__RCSID("$NetBSD: ifmcstat.c,v 1.20 2017/01/10 05:43:27 ozaki-r Exp $");
#include <err.h>
#include <errno.h>
@ -79,18 +79,28 @@ inet6_n2a(void *p)
return "(invalid)";
}
static bool
check_inet6_availability(void)
{
size_t dummy;
return sysctlnametomib("net.inet6.multicast", NULL, &dummy) == 0;
}
int
main(void)
{
struct if_nameindex *ifps;
size_t i;
bool inet6_available = check_inet6_availability();
ifps = if_nameindex();
if (ifps == NULL)
errx(1, "failed to obtain list of interfaces");
for (i = 0; ifps[i].if_name != NULL; ++i) {
printf("%s:\n", ifps[i].if_name);
if (inet6_available)
print_inet6_mcast(ifps[i].if_index, ifps[i].if_name);
print_ether_mcast(ifps[i].if_index);
}