Function GetIPAddress

core/netutil/ip.go:44–59

GetIPAddress returns a valid public IP Address from a collection of IP Addresses and a range of private subnets. Reports whether a valid IP was found.

(ipAddresses []string, privateRanges []IPRange)

//
// Reports whether a valid IP was found.
func GetIPAddress(ipAddresses []string, privateRanges []IPRange) (string, bool) {
	// march from right to left until we get a public address
	// that will be the address right before our proxy.
	for i := len(ipAddresses) - 1; i >= 0; i-- {
		ip := strings.TrimSpace(ipAddresses[i])
		realIP := net.ParseIP(ip)
		if !realIP.IsGlobalUnicast() || IPIsPrivateSubnet(realIP, privateRanges) {
			// bad address, go to next
			continue
		}
		return ip, true

	}

	return "", false
}