ronin-rb/ronin-recon

# frozen_string_literal: true
#
# ronin-recon - A micro-framework and tool for performing reconnaissance.
#
# Copyright (c) 2023-2024 Hal Brodigan (postmodern.mod3@gmail.com)
#
# ronin-recon is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ronin-recon is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with ronin-recon.  If not, see <https://www.gnu.org/licenses/>.
#

require_relative '../../dns_worker'

module Ronin
  module Recon
    module DNS
      #
      # Finds the mailservers for the domain.
      #
      class Mailservers < DNSWorker

        register 'dns/mailservers'

        summary 'Looks up the mailservers of a domain'
        description <<~DESC
          Queries the mailservers (MX records) for a domain name.
        DESC

        accepts Domain
        outputs Mailserver

        #
        # Finds the mailservers for the given domain.
        #
        # @param [Values::Domain] domain
        #   The given domain value.
        #
        # @yield [mailserver]
        #   Each discovered mailserver will be yielded.
        #
        # @yieldparam [Values::Mailserver] mailserver
        #   A discovered mailserver.
        #
        def process(domain)
          dns_get_mailservers(domain.name).each do |mailserver|
            unless mailserver == '.'
              yield Mailserver.new(mailserver.chomp('.'))
            end
          end
        end

      end
    end
  end
end