Date: Wed, 19 Jun 2002 09:57:52 -0600 From: John E Hein <jhein@timing.com> To: kevin@wooten.com Cc: hackers@FreeBSD.ORG Subject: Retrieving interface MAC address Message-ID: <15632.43520.992789.967232@brain.timing.com> In-Reply-To: <15632.43255.450681.215587@brain.timing.com> References: <bulk.29178.20020619081331@hub.freebsd.org> <15632.43255.450681.215587@brain.timing.com>
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John E Hein wrote at 09:53 -0600 on Jun 19:
> "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);
> }
> }
> }
Minor correction... that just finds the first match (which was just
what my app needed ;).
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