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-rw-r--r--lib/custodian/util/ping.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/custodian/util/ping.rb b/lib/custodian/util/ping.rb
index 86fa2ab..9abc746 100644
--- a/lib/custodian/util/ping.rb
+++ b/lib/custodian/util/ping.rb
@@ -25,6 +25,10 @@ module Custodian
# Save the hostname away, resolve it if possible.
#
def initialize( hostname )
+
+ raise ArgumentError, "Hostname must not be nil" if ( hostname.nil? )
+ raise ArgumentError, "Hostname must be a String" unless hostname.kind_of?( String )
+
@hostname = hostname
@resolved = Custodian::Util::DNS.hostname_to_ip( hostname )
end