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91 lines
3.0 KiB
91 lines
3.0 KiB
# Copyright (C) 2006, 2007, 2009-2011 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""TXT-like base class."""
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import struct
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import dns.exception
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import dns.rdata
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import dns.tokenizer
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from dns._compat import binary_type
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class TXTBase(dns.rdata.Rdata):
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"""Base class for rdata that is like a TXT record
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@ivar strings: the text strings
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@type strings: list of string
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@see: RFC 1035"""
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__slots__ = ['strings']
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def __init__(self, rdclass, rdtype, strings):
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super(TXTBase, self).__init__(rdclass, rdtype)
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if isinstance(strings, str):
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strings = [strings]
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self.strings = strings[:]
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def to_text(self, origin=None, relativize=True, **kw):
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txt = ''
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prefix = ''
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for s in self.strings:
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txt += '%s"%s"' % (prefix, dns.rdata._escapify(s))
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prefix = ' '
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return txt
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@classmethod
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def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
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strings = []
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while 1:
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token = tok.get().unescape()
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if token.is_eol_or_eof():
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break
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if not (token.is_quoted_string() or token.is_identifier()):
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raise dns.exception.SyntaxError("expected a string")
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if len(token.value) > 255:
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raise dns.exception.SyntaxError("string too long")
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value = token.value
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if isinstance(value, binary_type):
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strings.append(value)
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else:
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strings.append(value.encode())
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if len(strings) == 0:
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raise dns.exception.UnexpectedEnd
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return cls(rdclass, rdtype, strings)
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def to_wire(self, file, compress=None, origin=None):
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for s in self.strings:
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l = len(s)
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assert l < 256
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file.write(struct.pack('!B', l))
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file.write(s)
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@classmethod
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def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
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strings = []
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while rdlen > 0:
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l = wire[current]
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current += 1
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rdlen -= 1
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if l > rdlen:
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raise dns.exception.FormError
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s = wire[current: current + l].unwrap()
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current += l
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rdlen -= l
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strings.append(s)
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return cls(rdclass, rdtype, strings)
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