func validateNodeIP()

in internal/node/hybrid/ip_validator.go [106:141]

34 lines of code
13 McCabe index (conditional complexity)


func validateNodeIP(nodeIP net.IP, interfaceAddrs func() ([]net.Addr, error)) error {
	// Honor IP limitations set in setNodeStatus()
	if nodeIP.To4() == nil && nodeIP.To16() == nil {
		return fmt.Errorf("nodeIP must be a valid IP address")
	}
	if nodeIP.IsLoopback() {
		return fmt.Errorf("nodeIP can't be loopback address")
	}
	if nodeIP.IsMulticast() {
		return fmt.Errorf("nodeIP can't be a multicast address")
	}
	if nodeIP.IsLinkLocalUnicast() {
		return fmt.Errorf("nodeIP can't be a link-local unicast address")
	}
	if nodeIP.IsUnspecified() {
		return fmt.Errorf("nodeIP can't be an all zeros address")
	}

	addrs, err := interfaceAddrs()
	if err != nil {
		return err
	}
	for _, addr := range addrs {
		var ip net.IP
		switch v := addr.(type) {
		case *net.IPNet:
			ip = v.IP
		case *net.IPAddr:
			ip = v.IP
		}
		if ip != nil && ip.Equal(nodeIP) {
			return nil
		}
	}
	return fmt.Errorf("node IP: %q not found in the host's network interfaces", nodeIP.String())
}