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python3
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dist-packages
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dns
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rdtypes
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txtbase.py
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license # Copyright (C) 2006-2017 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. """TXT-like base class.""" import struct import dns.exception import dns.rdata import dns.tokenizer from dns._compat import binary_type, string_types class TXTBase(dns.rdata.Rdata): """Base class for rdata that is like a TXT record @ivar strings: the strings @type strings: list of binary @see: RFC 1035""" __slots__ = ['strings'] def __init__(self, rdclass, rdtype, strings): super(TXTBase, self).__init__(rdclass, rdtype) if isinstance(strings, binary_type) or \ isinstance(strings, string_types): strings = [strings] self.strings = [] for string in strings: if isinstance(string, string_types): string = string.encode() self.strings.append(string) def to_text(self, origin=None, relativize=True, **kw): txt = '' prefix = '' for s in self.strings: txt += '{}"{}"'.format(prefix, dns.rdata._escapify(s)) prefix = ' ' return txt @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): strings = [] while 1: token = tok.get().unescape() if token.is_eol_or_eof(): break if not (token.is_quoted_string() or token.is_identifier()): raise dns.exception.SyntaxError("expected a string") if len(token.value) > 255: raise dns.exception.SyntaxError("string too long") value = token.value if isinstance(value, binary_type): strings.append(value) else: strings.append(value.encode()) if len(strings) == 0: raise dns.exception.UnexpectedEnd return cls(rdclass, rdtype, strings) def to_wire(self, file, compress=None, origin=None): for s in self.strings: l = len(s) assert l < 256 file.write(struct.pack('!B', l)) file.write(s) @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): strings = [] while rdlen > 0: l = wire[current] current += 1 rdlen -= 1 if l > rdlen: raise dns.exception.FormError s = wire[current: current + l].unwrap() current += l rdlen -= l strings.append(s) return cls(rdclass, rdtype, strings)