// externalIP attempts to find an external IP to be reported as the guest IP
func externalIP() string {
l, err := netlink.LinkByName("client")
if err != nil {
log.Warnf("error looking up client interface by name: %s", err)
l, err = netlink.LinkByAlias("client")
if err != nil {
log.Errorf("error looking up client interface by alias: %s", err)
return ""
}
}
addrs, err := netlink.AddrList(l, netlink.FAMILY_V4)
if err != nil {
log.Errorf("error getting address list for client interface: %s", err)
return ""
}
if len(addrs) == 0 {
log.Warnf("no addresses set on client interface")
return ""
}
return addrs[0].IP.String()
}
func LinkByAlias(alias string) (Link, error) {
l, err := netlink.LinkByAlias(alias)
if err != nil {
return nil, err
}
return newLink(l), nil
}
func init() {
portMapper = portmap.NewPortMapper()
containerByPort = make(map[string]string)
l, err := netlink.LinkByName(externalIfaceName)
if l == nil {
l, err = netlink.LinkByAlias(externalIfaceName)
if err != nil {
log.Errorf("interface %s not found", externalIfaceName)
return
}
}
// don't use interface alias for iptables rules
externalIfaceName = l.Attrs().Name
}