ssl-client

#!/usr/bin/env ruby
# frozen_string_literal: true

# Copyright (c) 2011 The University of Manchester, UK.
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#  * Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
#
#  * Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
#  * Neither the names of The University of Manchester nor the names of its
#    contributors may be used to endorse or promote products derived from this
#    software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# Author: Robert Haines

require 'socket'
require 'openssl'
require 'optparse'

DEFAULT_PORT = 6666

options = { port: DEFAULT_PORT }
opts = OptionParser.new do |opt|
  opt.banner = 'Usage: ssl-client [options] host'
  opt.separator '  A basic secure sockets client where [options] can be:'
  opt.on('-p PORT', '--port=PORT', 'The port number to connect to. Default ' \
    "#{DEFAULT_PORT}.") do |val|
    options[:port] = val.chomp.to_i
  end
  opt.on('-c CERTIFICATE', '--cert=CERTICATE', 'Certificate and key in ' \
    'pem format.') do |val|
    options[:cert] = val.chomp
  end
  opt.on_tail('-h', '-?', '--help', 'Show this help message.') do
    puts opts
    exit
  end
  opt.on_tail('-v', '--version', 'Show the version.') do
    puts '2.0'
    exit
  end
end

opts.parse!

begin
  options[:host] = ARGV.shift.chomp
rescue StandardError
  puts 'Please supply a host to connect to.', opts
  exit(1)
end

context = OpenSSL::SSL::SSLContext.new
context.ca_file = options[:cert]
context.verify_mode = OpenSSL::SSL::VERIFY_PEER

tcp = TCPSocket.new(options[:host], options[:port])
socket = OpenSSL::SSL::SSLSocket.new(tcp, context)
socket.connect
puts 'Connected to server...'
while (out = socket.gets)
  puts out
end
puts 'Connection closed.'