From 6b2b0dfac0a659611b59401ae1b8e888cdea0f5d Mon Sep 17 00:00:00 2001
From: Steve Kemp <steve@steve.org.uk>
Date: Fri, 22 Apr 2016 16:09:39 +0300
Subject: Readded file.

It was required after all.
---
 lib/custodian/util/ping.rb | 92 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 lib/custodian/util/ping.rb

(limited to 'lib')

diff --git a/lib/custodian/util/ping.rb b/lib/custodian/util/ping.rb
new file mode 100644
index 0000000..d563722
--- /dev/null
+++ b/lib/custodian/util/ping.rb
@@ -0,0 +1,92 @@
+
+require 'custodian/util/dns'
+
+
+
+#
+# This class has methods to determine whether the target
+# of a hostname/IP address is IPv4 or IPv6.
+#
+# Assuming the address resolves to one of those two types
+# it can invoke on of /usr/bin/ping or /usr/bin/ping6 appropriately.
+#
+module Custodian
+
+  module Util
+
+    class Ping
+
+      #
+      # The hostname we'll ping, and the resolved address.
+      #
+      attr_reader :hostname, :resolved
+
+      #
+      # 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
+
+
+      #
+      # Return the resolved address
+      #
+      def address
+        @resolved
+      end
+
+      #
+      # Does the hostname resolve to an IPv4 address?
+      #
+      def is_ipv4?
+        if  (! @resolved.nil?) && (@resolved =~  /^([0-9]+).([0-9]+).([0-9]+).([0-9]+)$/)
+          true
+        else
+          false
+        end
+      end
+
+
+      #
+      # Does the hostname resolve to an IPv6 address?
+      #
+      def is_ipv6?
+        if  (! @resolved.nil?) && (@resolved =~  /^([a-f0-9:]+)$/i)
+          true
+        else
+          false
+        end
+      end
+
+
+
+      #
+      # Run the ping - if it succeeds return "true".
+      #
+      # Return false on error.
+      #
+      def run_ping
+        if  is_ipv6?
+          if (system("ping6 -c 1 #{@resolved} 2>/dev/null >/dev/null") == true)
+            return true
+          end
+        elsif is_ipv4?
+          if (system("ping -c 1 #{@resolved} 2>/dev/null >/dev/null") == true)
+            return true
+          end
+        else
+          puts 'ERROR: Resolved to neither an IPv6 or IPv4 address.'
+        end
+        false
+      end
+
+    end
+
+  end
+end
-- 
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