Serve file of size N over facecgi.

nettest.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()