Add delay/jitter to xmas scan

modules/auxiliary/scanner/portscan/xmas.rb

@@ -27,6 +27,8 @@ class Metasploit3 < Msf::Auxiliary
       OptString.new('PORTS', [true, "Ports to scan (e.g. 22-25,80,110-900)", "1-10000"]),
       OptInt.new('TIMEOUT', [true, "The reply read timeout in milliseconds", 500]),
       OptInt.new('BATCHSIZE', [true, "The number of hosts to scan per set", 256]),
+      OptInt.new('DELAY', [true, "The delay between connections, per thread, in milliseconds", 0]),
+      OptInt.new('JITTER', [true, "The delay jitter factor (maximum value by which to +/- DELAY) in milliseconds.", 0]),
       OptString.new('INTERFACE', [false, 'The name of the interface'])
     ], self.class)
 
@@ -48,11 +50,20 @@ class Metasploit3 < Msf::Auxiliary
     pcap = self.capture
 
     ports = Rex::Socket.portspec_crack(datastore['PORTS'])
-
     if ports.empty?
       raise Msf::OptionValidateError.new(['PORTS'])
     end
 
+    jitter_value = datastore['JITTER'].to_i
+    if jitter_value < 0
+      raise Msf::OptionValidateError.new(['JITTER'])
+    end
+
+    delay_value = datastore['DELAY'].to_i
+    if delay_value < 0
+      raise Msf::OptionValidateError.new(['DELAY'])
+    end
+
     to = (datastore['TIMEOUT'] || 500).to_f / 1000.0
 
     # we copy the hosts because some may not be reachable and need to be ejected
@@ -67,6 +78,9 @@ class Metasploit3 < Msf::Auxiliary
         begin
           probe = buildprobe(shost, sport, dhost, dport)
 
+          # Add the delay based on JITTER and DELAY if needs be
+          add_delay_jitter(delay_value,jitter_value)
+
           unless capture_sendto(probe, dhost)
             host_queue.delete(dhost)
             next