FEATURE: filter screened IP addresses

lib/ip_addr.rb

@@ -1,5 +1,24 @@
 class IPAddr
 
+  def self.handle_wildcards(val)
+    return if val.blank?
+
+    num_wildcards = val.count('*')
+
+    return val if num_wildcards == 0
+
+    # strip ranges like "/16" from the end if present
+    v = val.gsub(/\/.*/, '')
+
+    return if v[v.index('*')..-1] =~ /[^\.\*]/
+
+    parts = v.split('.')
+    (4 - parts.size).times { parts << '*' } # support strings like 192.*
+    v = parts.join('.')
+
+    "#{v.gsub('*', '0')}/#{32 - (v.count('*') * 8)}"
+  end
+
   def to_cidr_s
     if @addr
       mask = @mask_addr.to_s(2).count('1')