Continue loading even if pcaprub is not available

git-svn-id: file:///home/svn/framework3/trunk@6844 4d416f70-5f16-0410-b530-b9f4589650da

lib/racket/racket.rb

@@ -27,10 +27,6 @@
 #
 
 require 'socket'
-require 'pcaprub'
-
-
-
 
 require 'racket/racketpart'
 require 'racket/tlv'
@@ -49,6 +45,13 @@ class Racket
   attr_accessor :iface, :mtu, :timeout
   attr_accessor :layers, :payload
 
+  @@loaded_pcaprub = false
+  begin
+  	require 'pcaprub'
+  	@@loaded_pcaprub = true
+  rescue ::LoadError
+  end
+
   def initialize(payload="")
     @layers = []
     @mtu = 1500
@@ -121,6 +124,10 @@ class Racket
 
   # Write raw layer2 frames
   def send2
+    if(not @@loaded_pcaprub)
+      raise RuntimeError, "Could not initialize the pcaprub library"	
+	end
+	
     begin
       p = Pcap::open_live(@iface, @mtu, false, @timeout)
     rescue Exception => e