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