ipcymrubogon.py 文件源码

def evaluate(self,
                 hints  # Information used for doing identification
                 ):

        """Given a set of hints, evaluate this identifier and return True if
        an identification is made.

        """

        try:
            ip = hints['requester']
        except KeyError:
            return False

        octets = dns.reversename.from_address(ip)[0:-3]
        host = '.'.join(octets)
        host += '.v4.fullbogons.cymru.com' if len(octets) == 4 \
                else '.v6.fullbogons.cymru.com'

        # The query for this is always for an 'A' record, even for
        # IPv6 hosts.

        try:
            resolved = self.resolver.query(host, 'A')[0]
        except dns.resolver.NXDOMAIN:
            return False
        except (dns.exception.Timeout,
                dns.resolver.NoAnswer,
                dns.resolver.NoNameservers):
            return self.fail_result

        # The query will return 127.0.0.2 if it's in the bogon list.
        # See http://www.team-cymru.org/bogon-reference-dns.html.

        if str(resolved) != '127.0.0.2':
            return False

        # At this point, we have a bogon.  Filter out exclusions.

        net_ip = ipaddr.IPAddress(ip)
        for exclude in self.exclude:
            if net_ip in exclude:
                return False

        # Not excluded; must be a legit bogon.

        return True


# A short test program