cn-route-parser.py

#!/usr/bin/env python3
import sys
import math
from ipaddress import IPv4Network


def main():
    for line in sys.stdin:
        if 'CN' not in line or 'ipv4' not in line:
            continue
        cols = line.strip().split('|')
        ip, num = cols[3:5]
        prefixlen = 32 - int(math.log(int(num), 2))

        ipnet = IPv4Network('%s/%s' % (ip, prefixlen))
        #print(ipnet)
        #print(ipnet.with_netmask)
        print('add cnnet %s' % ipnet.with_prefixlen)
        #net, mask = ipnet.with_netmask.split('/')
        #print("add %s mask %s default METRIC default IF default" \
        #        % (net, mask))

if __name__ == '__main__':
    main()