added a simple tftp utility

1 files changed, 52 insertions, 0 deletions

diff --git a/lib/custodian/util/tftp.rb b/lib/custodian/util/tftp.rb
new file mode 100644
index 0000000..3028874
--- /dev/null
+++ b/lib/custodian/util/tftp.rb
@@ -0,0 +1,52 @@
+require 'tmpdir'
+require 'fileutils'
+
+module Custodian
+
+  module Util
+
+    class Tftp
+
+      attr_reader :hostname, :port, :filename
+
+      #
+      # Store hostname and port
+      #
+      def initialize(hostname, port=69)
+      
+        raise ArgumentError, 'Hostname must not be nil' if  hostname.nil?
+        raise ArgumentError, 'Hostname must be a String' unless  hostname.kind_of?(String)
+        raise ArgumentError, 'Port must be a number' unless port.to_i > 0
+
+        @hostname = hostname
+        @port = port.to_i
+      end
+
+      #
+      # Returns true only if the file can be downloaded and is not zero-length.
+      #
+      def test(file)
+        target = Dir::Tmpname.make_tmpname('/tmp/', nil)
+
+        return false unless fetch(file, target)
+        return false unless File.size?(target)
+        return true
+      ensure
+        FileUtils.rm_f(target)
+      end
+
+      def fetch(file, target=nil)
+        # HPA's tftp client appears to have a 25s timeout that it is
+        # not possible to change on the command line.
+        return tftp("-m binary #{@hostname} #{@port} -c get #{file} #{target}")
+      end
+
+      def tftp(args)
+        return system("tftp #{args}") == true
+      end
+
+    end
+
+  end
+
+end