Add a find_layers method

git-svn-id: file:///home/svn/framework3/trunk@5456 4d416f70-5f16-0410-b530-b9f4589650da

lib/msf/core/exploit/capture.rb

@@ -142,6 +142,17 @@ module Exploit::Capture
 		end
 	end
 
+	def find_layers(pkt, cls)
+		res = []
+		pkt.layers_list.each do |layer|
+			if layer.class == cls
+				res << layer
+			end
+		end
+		res
+	end
+
+
 	attr_accessor :capture
 
 end