Asterisk AMI event listener - connect, read, & output

ami_listener.rb

#!/usr/bin/ruby

# connect to Asterisk AMI port, authenticate, and print all AMI event messages
# as they're received.
# more or for Asterisk hosting: http://help.cloudvox.com/
# version: 2010-05-04
require 'socket'

unless ARGV.length == 4
  puts 'usage: ruby ./ami_listener.rb hostname port username password'
  puts 'example: ruby ./ami_listener.rb ami.cloudvox.com 12345 manager ubers3kr3t'
  exit(2)
end

begin
  t = TCPSocket.new(ARGV[0], ARGV[1])
rescue
  puts "Could not connect: #{$!}"
  exit(3)
end

# banner
puts t.gets

t.print "Action: login\r\nUsername: #{ARGV[2]}\r\nSecret: #{ARGV[3]}\r\n\r\n"

while true
  puts t.gets
end