Contains the method {#is_port_open?} to check if a port is open (listening) or closed (not in use). This method isn't completely fool-proof, but it works enough of the time to be useful.
Checks if a port is open (listening) on a given host and port.
@param [String] host Hostname or IP address. @param [Integer] port Port to check. @return [Boolean] `true` if the port is open (listening), `false`
otherwise.
# File lib/vagrant/util/is_port_open.rb, line 16 def is_port_open?(host, port) # We wrap this in a timeout because once in awhile the TCPSocket # _will_ hang, but this signals that the port is closed. Timeout.timeout(1) do # Attempt to make a connection s = TCPSocket.new(host, port) # A connection was made! Properly clean up the socket, not caring # at all if any exception is raised, because we already know the # result. s.close rescue nil # The port is open if we reached this point, since we were able # to connect. return true end rescue Timeout::Error, Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Errno::ENETUNREACH # Any of the above exceptions signal that the port is closed. return false end