func validateRemoteAddr(ip net.IP) bool {
if ip == nil {
return false
}
if ip.IsInterfaceLocalMulticast() {
return false
}
if ip.IsLinkLocalMulticast() {
return false
}
if ip.IsLinkLocalUnicast() {
return false
}
if ip.IsLoopback() {
return false
}
if ip.IsMulticast() {
return false
}
if ip.IsUnspecified() {
return false
}
if isBroadcasty(ip) {
return false
}
return true
}
func InterfaceIPs() ([]*net.IPAddr, error) {
var (
addrs []*net.IPAddr
)
ifaces, err := net.Interfaces()
if err != nil {
return nil, err
}
for _, iface := range ifaces {
iaddrs, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, iaddr := range iaddrs {
var (
ip net.IP
zone string
)
switch x := iaddr.(type) {
case *net.IPAddr:
ip = x.IP
zone = x.Zone
case *net.IPNet:
ip = x.IP
zone = ""
}
if ip.IsMulticast() ||
ip.IsUnspecified() ||
ip.IsInterfaceLocalMulticast() ||
ip.IsLinkLocalMulticast() ||
ip.IsLinkLocalUnicast() {
continue
}
if ipv4 := ip.To4(); ipv4 != nil {
ip = ipv4
}
addrs = append(addrs, &net.IPAddr{
IP: ip,
Zone: zone,
})
}
}
return addrs, nil
}
func isLoopbackIP(ip net.IP) bool {
// ignore loopback ips
if ip.IsLoopback() {
return true
}
// ignore local ips
if ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
return true
}
return false
}
func chooseHostInterfaceNativeGo() (net.IP, error) {
intfs, err := net.Interfaces()
if err != nil {
return nil, err
}
i := 0
var ip net.IP
for i = range intfs {
if flagsSet(intfs[i].Flags, net.FlagUp) && flagsClear(intfs[i].Flags, net.FlagLoopback|net.FlagPointToPoint) {
addrs, err := intfs[i].Addrs()
if err != nil {
return nil, err
}
if len(addrs) > 0 {
for _, addr := range addrs {
if addrIP, _, err := net.ParseCIDR(addr.String()); err == nil {
if addrIP.To4() != nil {
ip = addrIP.To4()
if !ip.IsLinkLocalMulticast() && !ip.IsLinkLocalUnicast() {
break
}
}
}
}
if ip != nil {
// This interface should suffice.
break
}
}
}
}
if ip == nil {
return nil, fmt.Errorf("no acceptable interface from host")
}
glog.V(4).Infof("Choosing interface %s (IP %v) as default", intfs[i].Name, ip)
return ip, nil
}