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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license # Copyright (C) 2001-2017 Nominum, Inc. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """DNS Rdata Classes.""" import re import dns.exception RESERVED0 = 0 IN = 1 CH = 3 HS = 4 NONE = 254 ANY = 255 _by_text = { 'RESERVED0': RESERVED0, 'IN': IN, 'CH': CH, 'HS': HS, 'NONE': NONE, 'ANY': ANY } # We construct the inverse mapping programmatically to ensure that we # cannot make any mistakes (e.g. omissions, cut-and-paste errors) that # would cause the mapping not to be true inverse. _by_value = {y: x for x, y in _by_text.items()} # Now that we've built the inverse map, we can add class aliases to # the _by_text mapping. _by_text.update({ 'INTERNET': IN, 'CHAOS': CH, 'HESIOD': HS }) _metaclasses = { NONE: True, ANY: True } _unknown_class_pattern = re.compile('CLASS([0-9]+)$', re.I) class UnknownRdataclass(dns.exception.DNSException): """A DNS class is unknown.""" def from_text(text): """Convert text into a DNS rdata class value. The input text can be a defined DNS RR class mnemonic or instance of the DNS generic class syntax. For example, "IN" and "CLASS1" will both result in a value of 1. Raises ``dns.rdatatype.UnknownRdataclass`` if the class is unknown. Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535. Returns an ``int``. """ value = _by_text.get(text.upper()) if value is None: match = _unknown_class_pattern.match(text) if match is None: raise UnknownRdataclass value = int(match.group(1)) if value < 0 or value > 65535: raise ValueError("class must be between >= 0 and <= 65535") return value def to_text(value): """Convert a DNS rdata type value to text. If the value has a known mnemonic, it will be used, otherwise the DNS generic class syntax will be used. Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535. Returns a ``str``. """ if value < 0 or value > 65535: raise ValueError("class must be between >= 0 and <= 65535") text = _by_value.get(value) if text is None: text = 'CLASS' + repr(value) return text def is_metaclass(rdclass): """True if the specified class is a metaclass. The currently defined metaclasses are ANY and NONE. *rdclass* is an ``int``. """ if rdclass in _metaclasses: return True return False