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#!/usr/bin/env fail2ban-python
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# Inspired by https://isc.sans.edu/forums/diary/When+Google+isnt+Google/15968/
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#
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# Written in Python to reuse built-in Python batteries and not depend on
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# presence of host and cut commands
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#
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import sys
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def process_args(argv):
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    if len(argv) != 2:
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       sys.stderr.write("Please provide a single IP as an argument. Got: %s\n"
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                        % (argv[1:]))
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       sys.exit(2)
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    ip = argv[1]
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    from fail2ban.server.filter import DNSUtils
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    if not DNSUtils.isValidIP(ip):
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       sys.stderr.write("Argument must be a single valid IP. Got: %s\n"
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                        % ip)
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       sys.exit(3)
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    return ip
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def is_googlebot(ip):
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    import re
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    from fail2ban.server.filter import DNSUtils
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    host = DNSUtils.ipToName(ip)
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    if not host or not re.match('.*\.google(bot)?\.com$', host):
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       sys.exit(1)
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    host_ips = DNSUtils.dnsToIp(host)
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    sys.exit(0 if ip in host_ips else 1)
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if __name__ == '__main__':
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    is_googlebot(process_args(sys.argv))