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Edit File : txtbase.py \| Size : 2.97 KB
# Copyright (C) 2006, 2007, 2009-2011 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 class TXTBase(dns.rdata.Rdata): """Base class for rdata that is like a TXT record @ivar strings: the text strings @type strings: list of string @see: RFC 1035""" __slots__ = ['strings'] def __init__(self, rdclass, rdtype, strings): super(TXTBase, self).__init__(rdclass, rdtype) if isinstance(strings, str): strings = [strings] self.strings = strings[:] def to_text(self, origin=None, relativize=True, **kw): txt = '' prefix = '' for s in self.strings: txt += '%s"%s"' % (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) Back

Edit File : txtbase.py | Size : 2.97 KB

# Copyright (C) 2006, 2007, 2009-2011 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

class TXTBase(dns.rdata.Rdata):

"""Base class for rdata that is like a TXT record

@ivar strings: the text strings
    @type strings: list of string
    @see: RFC 1035"""

__slots__ = ['strings']

def __init__(self, rdclass, rdtype, strings):
        super(TXTBase, self).__init__(rdclass, rdtype)
        if isinstance(strings, str):
            strings = [strings]
        self.strings = strings[:]

def to_text(self, origin=None, relativize=True, **kw):
        txt = ''
        prefix = ''
        for s in self.strings:
            txt += '%s"%s"' % (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)

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