Dump AWS netblocks into zone files for use as ipsets

aws-ip-ranges-to-zones.py

#!/usr/bin/env python

# download the current Amazon AWS list of netblocks and dump it into
# two files, one each for IPv4 and IPv6. The result can be imported
# into firewalld ipsets using --add-entries-from-file

import requests

ipv4_filename = 'AmazonAWS_ipv4.zone'
ipv6_filename = 'AmazonAWS_ipv6.zone'

# See https://aws.amazon.com/blogs/aws/aws-ip-ranges-json/

# fetch the JSON 
r = requests.get('https://ip-ranges.amazonaws.com/ip-ranges.json')
# parse it into a dict of dicts
j = r.json()

# dump into output files

with open(ipv4_filename, "w") as ipv4_file:
    for p in j['prefixes']:
        ipv4_file.write(p['ip_prefix'])
        ipv4_file.write('\n')

with open(ipv6_filename, "w") as ipv6_file:
    for p in j['ipv6_prefixes']:
        ipv6_file.write(p['ipv6_prefix'])
        ipv6_file.write('\n')