diff --git a/lib/resolv.rb b/lib/resolv.rb index 83f2fbf0e8..e46b4cef92 100644 --- a/lib/resolv.rb +++ b/lib/resolv.rb @@ -659,8 +659,20 @@ class Resolv } end - def self.bind_random_port(udpsock, bind_host="0.0.0.0") # :nodoc: - begin + case RUBY_PLATFORM + when *[ + # https://www.rfc-editor.org/rfc/rfc6056.txt + # Appendix A. Survey of the Algorithms in Use by Some Popular Implementations + /freebsd/, /linux/, /netbsd/, /openbsd/, /solaris/, + /darwin/, # the same as FreeBSD + ] then + def self.bind_random_port(udpsock, bind_host="0.0.0.0") # :nodoc: + udpsock.bind(bind_host, 0) + end + else + # Sequential port assignment + def self.bind_random_port(udpsock, bind_host="0.0.0.0") # :nodoc: + # Ephemeral port number range recommended by RFC 6056 port = random(1024..65535) udpsock.bind(bind_host, port) rescue Errno::EADDRINUSE, # POSIX