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#!/usr/bin/env fail2ban-python
# Inspired by https://isc.sans.edu/forums/diary/When+Google+isnt+Google/15968/
#
# Written in Python to reuse built-in Python batteries and not depend on
# presence of host and cut commands
#
import sys
from fail2ban.server.ipdns import DNSUtils, IPAddr
def process_args(argv):
if len(argv) != 2:
raise ValueError("Please provide a single IP as an argument. Got: %s\n"
% (argv[1:]))
ip = argv[1]
if not IPAddr(ip).isValid:
raise ValueError("Argument must be a single valid IP. Got: %s\n"
% ip)
return ip
google_ips = None
def is_googlebot(ip):
import re
host = DNSUtils.ipToName(ip)
if not host or not re.match(r'.*\.google(bot)?\.com$', host):
return False
host_ips = DNSUtils.dnsToIp(host)
return (ip in host_ips)
if __name__ == '__main__': # pragma: no cover
try:
ret = is_googlebot(process_args(sys.argv))
except ValueError as e:
sys.stderr.write(str(e))
sys.exit(2)
sys.exit(0 if ret else 1)