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# Authors: Martin Basti <mbasti@redhat.com>
#
# Copyright (C) 2007-2014 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import dns.name
import dns.exception
import copy
import six
if six.PY3:
unicode = str
@six.python_2_unicode_compatible
class DNSName(dns.name.Name):
labels = None # make pylint happy
@classmethod
def from_text(cls, labels, origin=None):
return cls(dns.name.from_text(labels, origin))
def __init__(self, labels, origin=None):
try:
if isinstance(labels, six.string_types):
#pylint: disable=E1101
labels = dns.name.from_text(unicode(labels), origin).labels
elif isinstance(labels, dns.name.Name):
labels = labels.labels
super(DNSName, self).__init__(labels)
except UnicodeError as e:
# dnspython bug, an invalid domain name returns the UnicodeError
# instead of a dns.exception
raise dns.exception.SyntaxError(e)
def __nonzero__(self):
#dns.name.from_text('@') is represented like empty tuple
#we need to acting '@' as nonzero value
return True
def __copy__(self):
return DNSName(self.labels)
def __deepcopy__(self, memo):
return DNSName(copy.deepcopy(self.labels, memo))
def __str__(self):
return self.to_unicode()
def ToASCII(self):
#method named by RFC 3490 and python standard library
return self.to_text().decode('ascii') # must be unicode string
def canonicalize(self):
return DNSName(super(DNSName, self).canonicalize())
def concatenate(self, other):
return DNSName(super(DNSName, self).concatenate(other))
def relativize(self, origin):
return DNSName(super(DNSName, self).relativize(origin))
def derelativize(self, origin):
return DNSName(super(DNSName, self).derelativize(origin))
def choose_relativity(self, origin=None, relativize=True):
return DNSName(super(DNSName, self).choose_relativity(origin=origin,
relativize=relativize))
def make_absolute(self):
return self.derelativize(self.root)
def is_idn(self):
return any(label.startswith('xn--') for label in self.labels)
def is_ip4_reverse(self):
return self.is_subdomain(self.ip4_rev_zone)
def is_ip6_reverse(self):
return self.is_subdomain(self.ip6_rev_zone)
def is_reverse(self):
return self.is_ip4_reverse() or self.is_ip6_reverse()
def is_empty(self):
return len(self.labels) == 0
#DNS public constants
DNSName.root = DNSName(dns.name.root) # '.'
DNSName.empty = DNSName(dns.name.empty) # '@'
DNSName.ip4_rev_zone = DNSName(('in-addr', 'arpa', ''))
DNSName.ip6_rev_zone = DNSName(('ip6', 'arpa', ''))
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