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// vim:ts=4:sw=4:expandtab
#include <sys/socket.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <ifaddrs.h>
#include "i3status.h"
const char *first_eth_interface(const net_type_t type) {
static char *interface = NULL;
struct ifaddrs *ifaddr, *addrp;
struct stat stbuf;
static char path[1024];
getifaddrs(&ifaddr);
if (ifaddr == NULL)
return NULL;
free(interface);
interface = NULL;
for (addrp = ifaddr;
addrp != NULL;
addrp = addrp->ifa_next) {
if (strncasecmp("lo", addrp->ifa_name, strlen("lo")) == 0)
continue;
if (addrp->ifa_addr == NULL)
continue;
// Skip PF_PACKET addresses (MAC addresses), as they are present on any
// ethernet interface.
if (addrp->ifa_addr->sa_family != AF_INET &&
addrp->ifa_addr->sa_family != AF_INET6)
continue;
// Skip this interface if it is a wireless interface.
snprintf(path, sizeof(path), "/sys/class/net/%s/wireless", addrp->ifa_name);
const bool is_wireless = (stat(path, &stbuf) == 0);
if ((is_wireless && type == NET_TYPE_ETHERNET) ||
(!is_wireless && type == NET_TYPE_WIRELESS))
continue;
interface = strdup(addrp->ifa_name);
break;
}
freeifaddrs(ifaddr);
return interface;
}
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