func GetDefaultRouteIface() (int, error) {
defaultRt := net.ParseIP("0.0.0.0")
rs, err := netlink.RouteGet(defaultRt)
if err != nil {
return -1, fmt.Errorf("unable to get default route: %v", err)
}
if len(rs) > 0 {
return rs[0].LinkIndex, nil
}
return -1, ErrNoDefaultRoute
}
func GetIfaceForRoute(address string) (string, error) {
addr := net.ParseIP(address)
if addr == nil {
return "", errors.New("invalid address")
}
routes, err := netlink.RouteGet(addr)
if err != nil {
return "", err
}
if len(routes) <= 0 {
return "", errors.New("no route to destination")
}
link, err := netlink.LinkByIndex(routes[0].LinkIndex)
if err != nil {
return "", err
}
return link.Attrs().Name, nil
}