Ident client (RFC 1413)

ident.rb

#! /usr/bin/env ruby
# ./ident.rb HOST PORT
# Get the username of the remote port

require 'socket'
require 'timeout'

hostname = ARGV[0]
port = ARGV[1]
timeout_interval = ARGV[2] || 5

begin
  timeout(timeout_interval.to_i) do
    dest_socket = TCPSocket.open(hostname, port)
    ident_socket = TCPSocket.open(hostname, 113)

    local_port = dest_socket.addr[1]
    ident_socket.puts "#{port}, #{local_port}"

    p ident_socket.gets
  end
rescue Timeout::Error
  puts "Timeout checking ident for #{hostname}:#{port}"
end