Date: Wed, 19 Jun 2002 09:53:27 -0600 From: John E Hein <jhein@timing.com> To: kevin@wooten.com Cc: hackers@FreeBSD.ORG Subject: Retrieving interface MAC address Message-ID: <15632.43255.450681.215587@brain.timing.com> In-Reply-To: <bulk.29178.20020619081331@hub.freebsd.org> References: <bulk.29178.20020619081331@hub.freebsd.org>
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"Kevin D. Wooten" <kevin@wooten.com> wrote at 13:41:02 -0700 on 18 Jun 2002:
> Thanks getifaddrs() works great, just one more thing is there a simple
> way to tell the difference between "real" interfaces and virtual ones? I
> could obviously exclude the easy ones ( i.e. lo, lp, faith, ... ) by
> looking at the name, but I am not sure how many different virtual
> interfaces there are ( or will be ).
This gets link interfaces and further checks for just ethernet types:
get_if_name(char if_name[IFNAMSIZ])
{
struct ifaddrs *ifaphead;
if (getifaddrs(&ifaphead) != 0)
perror("get_if_name: getifaddr() failed");
else
{
bool found = false;
struct ifaddrs *ifap;
for (ifap = ifaphead; ifap && !found; ifap = ifap->ifa_next)
{
if ((ifap->ifa_addr->sa_family == AF_LINK)
&& (((struct sockaddr_dl *) ifap->ifa_addr)->sdl_type ==
IFT_ETHER))
{
found = true;
strlcpy(if_name, ifap->ifa_name, IFNAMSIZ);
printf("found ethernet if: %s\n", if_name);
}
}
if (!found)
{
fprintf(stderr, "get_if_name: did not find ethernet if\n");
strlcpy(if_name, "", IFNAMSIZ);
}
}
}
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