Provide a new nsock_setup_udp function to create a UDP socket without connecting it. Provide an NSE interface to the function. Add broadcast.nse, a script that receives UDP broadcasts with an unconnected socket.

scripts/broadcast.nse

@@ -0,0 +1,15 @@
+description = ""
+categories = {}
+
+prerule = function() return true end
+
+action = function()
+  local s, status, data
+
+  s = nmap.new_socket()
+  s:bind("255.255.255.255", 67)
+  s:setup("ipv4", "udp")
+  status, data = s:receive()
+
+  return data
+end