Dispatch zero-fill file of user request size over the network.

nettest.cgi.py

#!/usr/bin/python3

import os
import subprocess
import re
import humanfriendly
SIZE_RE = re.compile("^\d{,4}([KMG])$")

def main():
	file_size = (
		os.environ.get('QUERY_STRING')
		or os.environ.get('REQUEST_URI').split('/nettest/', 1)[-1]
		or '100M'
	).upper().rstrip('B')
	if not SIZE_RE.match(file_size):
		print('Content-Type: text/html', end='\n\n')
		print('Couldn\'t parse dd size "{}" (four digits max)'.format(file_size))
		raise SystemExit('Bad DD Size')

	file_bytes = humanfriendly.parse_size(file_size+'B', binary=True)

	_cmd = ['dd', 'if=/dev/zero', 'of=/dev/stdout', 'count=1', 'bs={}'.format(file_size)]
	print('Content-Type: application/octet-stream')
	print('Content-Type: application/octet-stream')
	print('Content-Disposition: attachment; filename="nettest-{}B.bin"'.format(file_size))
	print('Content-length: {}'.format(file_bytes), end='\n\n')
	popen = subprocess.Popen(
		_cmd, 
		stderr=subprocess.PIPE,

	)

if __name__ == '__main__':
	main()

site-nettest.conf

server {
	location /nettest/ {
		include	/etc/nginx/fastcgi_params;
		fastcgi_pass	unix:/run/fcgiwrap.socket;
		fastcgi_params	SCRIPT_FILENAME /srv/cgi-bin/nettest.py;
	}
}