From 06c1e4db27ca6c68c694e35af651502b0da6086e Mon Sep 17 00:00:00 2001
From: Steve Kemp <steve@steve.org.uk>
Date: Tue, 13 Jan 2015 16:02:02 +0000
Subject: Lookup MX record(s) for the domain under test.

---
 lib/custodian/protocoltest/mx.rb | 50 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/lib/custodian/protocoltest/mx.rb b/lib/custodian/protocoltest/mx.rb
index 70fe465..ed46c4c 100644
--- a/lib/custodian/protocoltest/mx.rb
+++ b/lib/custodian/protocoltest/mx.rb
@@ -21,10 +21,16 @@ module Custodian
       # Constructor
       #
       def initialize( line )
+
+        # Save the line away
         @line = line
+
+        # The main domain we're querying
+        @host = line.split(/\s+/)[0]
       end
 
 
+
       #
       # Allow this test to be serialized.
       #
@@ -41,6 +47,50 @@ module Custodian
         # reset the error, in case we were previously executed.
         @error = nil
 
+        #
+        # Get the timeout period.
+        #
+        settings = Custodian::Settings.instance()
+        period   = settings.timeout()
+
+        #
+        #  The MX-hosts
+        #
+        mx = Array.new()
+
+        #
+        #  Lookup the MX record
+        #
+        begin
+          timeout( period ) do
+
+            Resolv::DNS.open do |dns|
+              ress = dns.getresources(@host, Resolv::DNS::Resource::IN::MX)
+              ress.map { |r| mx.push( IPSocket::getaddress(r.exchange.to_s) ) }
+            end
+          end
+        rescue Timeout::Error => e
+          @error = "Timed-out performing DNS lookups: #{e}"
+          return nil
+        end
+
+        #
+        # At this point we should have an array of IPv4 or IPv6 addresses.
+        #
+        # If that array is empty then there will be no incoming mail because
+        # there are now working MX records in DNS - or because the domain
+        # has expired, etc.
+        #
+        # So on that basis we must alert.
+        #
+        if ( mx.empty? ) then
+          @error = "Failed to perform DNS lookup of MX record(s) for host #{@host}"
+          return false
+        end
+
+        mx.each do |bob|
+          puts "XXXX #{bob}"
+        end
         return true;
       end
 
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