1 // vim:ts=4:sw=4:expandtab
8 const char *first_eth_interface(const net_type_t type) {
9 static char *interface = NULL;
10 struct ifaddrs *ifaddr, *addrp;
12 static char path[1024];
23 addrp = addrp->ifa_next) {
24 if (strncasecmp("lo", addrp->ifa_name, strlen("lo")) == 0)
26 if (addrp->ifa_addr == NULL)
28 // Skip PF_PACKET addresses (MAC addresses), as they are present on any
29 // ethernet interface.
30 if (addrp->ifa_addr->sa_family != AF_INET &&
31 addrp->ifa_addr->sa_family != AF_INET6)
33 // Skip this interface if it is a wireless interface.
34 snprintf(path, sizeof(path), "/sys/class/net/%s/wireless", addrp->ifa_name);
35 const bool is_wireless = (stat(path, &stbuf) == 0);
36 if ((is_wireless && type == NET_TYPE_ETHERNET) ||
37 (!is_wireless && type == NET_TYPE_WIRELESS))
39 interface = strdup(addrp->ifa_name);