Expose your private port on a public server over SSH

tunnel.thor

class Tunnel < Thor
  method_options :environment => "development", :aliases => "-e", :desc => "Config environment"
  
  
  desc "start", "Start an ssh tunnel"
  def start
    random_hi_port = rand(30000) + 30000
    
    identity_part = tunnel['identity_file'] ? "-i #{tunnel['identity_file']}" : ""
    ssh_part = "ssh -t #{identity_part} -g -R *:#{random_hi_port}:0.0.0.0:#{tunnel['local_port']} #{tunnel['username']}@#{tunnel['public_host']}"
    socat_cmd = "socat TCP-LISTEN:#{tunnel['public_port']},fork,reuseaddr TCP:localhost:#{random_hi_port}"
    command = "#{ssh_part} #{socat_cmd}"
    
    puts "executing #{command}"
    exec command
  end

  
  private
  def tunnel
    @tunnel ||= YAML.load_file(File.expand_path('tunnel.yml'))[options[:environment]]
  end
end