try the following diff.
--- src/libnet_link_bpf.c.orig Mon Jan 8 03:13:48 2001
+++ src/libnet_link_bpf.c Fri Nov 7 12:08:38 2008
@@ -250,6 +250,7 @@
char *buf, *next, *end;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
+ struct sockaddr *sa;
struct ether_addr *ea = NULL;
mib[0] = CTL_NET;
@@ -280,7 +281,10 @@
ifm = (struct if_msghdr *)next;
if (ifm->ifm_type == RTM_IFINFO)
{
- sdl = (struct sockaddr_dl *)(ifm + 1);
+ sa = (struct sockaddr *)(ifm + 1);
+ if (sa->sa_family != AF_LINK)
+ continue;
+ sdl = (struct sockaddr_dl *)sa;
if (strncmp(&sdl->sdl_data[0], device, sdl->sdl_nlen) == 0)
{
if (!(ea = malloc(sizeof(struct ether_addr))))
