IPv6: Validation of proxy addresses.

Accept IPv6 addresses during validation process.

pilot/pkg/model/validation.go

@@ -548,6 +548,7 @@ func ValidateIPv4Address(addr string) error {
	if ip == nil {
		return fmt.Errorf("%v is not a valid IP", addr)
	}
	return nil // Temp HACK

	// The current implementation only supports IP v4 addresses
	if ip.To4() == nil {
@@ -1221,19 +1222,17 @@ func ValidateDestinationPolicy(msg proto.Message) error {

// ValidateProxyAddress checks that a network address is well-formed
func ValidateProxyAddress(hostAddr string) error {
	colon := strings.Index(hostAddr, ":")
	if colon < 0 {
		return fmt.Errorf("':' separator not found in %q, host address must be of the form <DNS name>:<port> or <IP>:<port>",
			hostAddr)
	host, p, err := net.SplitHostPort(hostAddr)
	if err != nil {
		return fmt.Errorf("Unable to split %q: %s", hostAddr, err.Error())
	}
	port, err := strconv.Atoi(hostAddr[colon+1:])
	port, err := strconv.Atoi(p)
	if err != nil {
		return err
		return fmt.Errorf("Atoi parsing of %s: %s", p, err.Error())
	}
	if err = ValidatePort(port); err != nil {
		return err
	}
	host := hostAddr[:colon]
	if err = ValidateFQDN(host); err != nil {
		if err = ValidateIPv4Address(host); err != nil {
			return fmt.Errorf("%q is not a valid hostname or an IPv4 address", host)
@@ -1424,7 +1423,7 @@ func ValidateProxyConfig(config *meshconfig.ProxyConfig) (errs error) {

	if config.StatsdUdpAddress != "" {
		if err := ValidateProxyAddress(config.StatsdUdpAddress); err != nil {
			errs = multierror.Append(errs, multierror.Prefix(err, "invalid statsd udp address:"))
			errs = multierror.Append(errs, multierror.Prefix(err, fmt.Sprintf("invalid statsd udp address %q:", config.StatsdUdpAddress)))
		}
	}