Ruby - See if a port is open
Something like the following might work:
require 'socket'require 'timeout'def is_port_open?(ip, port) begin Timeout::timeout(1) do begin s = TCPSocket.new(ip, port) s.close return true rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH return false end end rescue Timeout::Error end return falseend
More Ruby idiomatic syntax:
require 'socket'require 'timeout'def port_open?(ip, port, seconds=1) Timeout::timeout(seconds) do begin TCPSocket.new(ip, port).close true rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH false end endrescue Timeout::Error falseend
All other existing answer are undesirable. Using Timeout is discouraged. Perhaps things depend on ruby version. At least since 2.0 one can simply use:
Socket.tcp("www.ruby-lang.org", 10567, connect_timeout: 5) {}For older ruby the best method I could find is using non-blocking mode and then select. Described here: