Specify default UDP Data/Payload

[GodlyEcstasy]

Please add the ability to use a default payload when scanning for UDP (such as --probe-args=hex:ff for zmap). I have been unable to send anything other than UDP with len=0 so far with masscan.

If this is not an option, could you please specify a point in the source code that I can make the changes necessary to send a specific string by default instead of zero-length payload?

Note: I am scanning random UDP ports (-p U:1024-2048) so options such as --nmap-payloads is not an effective solution for me.

[mzpqnxow]

#647 or #670 should help you