messaging hostname fqdn validation

lib/manageiq/appliance_console/message_configuration.rb

@@ -67,6 +67,8 @@ def ask_questions
         show_parameters
         return false unless agree("\nProceed? (Y/N): ")
 
+        return false if hostname?(message_server_host) && !hostname_fqdn?(message_server_host)
+
         return false unless host_reachable?(message_server_host, "Message Server Host:")
 
         true
@@ -177,6 +179,21 @@ def file_contains?(path, content)
         true
       end
 
+      def hostname?(host)
+        host !~ IP_REGEXP
+      end
+
+      def hostname_fqdn?(host)
+        require "socket"
+
+        fqdn = Addrinfo.getaddrinfo(Socket.gethostname, nil).first.getnameinfo.first
+        unless host == fqdn
+          return false
+        end
+
+        true
+      end
+
       def host_reachable?(host, what)
         require 'net/ping'
         say("Checking connectivity to #{host} ... ")