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