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Edit File : rdata.py \| Size : 14.65 KB
# Copyright (C) 2001-2007, 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. """DNS rdata. @var _rdata_modules: A dictionary mapping a (rdclass, rdtype) tuple to the module which implements that type. @type _rdata_modules: dict @var _module_prefix: The prefix to use when forming modules names. The default is 'dns.rdtypes'. Changing this value will break the library. @type _module_prefix: string @var _hex_chunk: At most this many octets that will be represented in each chunk of hexstring that _hexify() produces before whitespace occurs. @type _hex_chunk: int""" from io import BytesIO import base64 import binascii import dns.exception import dns.name import dns.rdataclass import dns.rdatatype import dns.tokenizer import dns.wiredata from ._compat import xrange, string_types, text_type _hex_chunksize = 32 def _hexify(data, chunksize=_hex_chunksize): """Convert a binary string into its hex encoding, broken up into chunks of I{chunksize} characters separated by a space. @param data: the binary string @type data: string @param chunksize: the chunk size. Default is L{dns.rdata._hex_chunksize} @rtype: string """ line = binascii.hexlify(data) return b' '.join([line[i:i + chunksize] for i in range(0, len(line), chunksize)]).decode() _base64_chunksize = 32 def _base64ify(data, chunksize=_base64_chunksize): """Convert a binary string into its base64 encoding, broken up into chunks of I{chunksize} characters separated by a space. @param data: the binary string @type data: string @param chunksize: the chunk size. Default is L{dns.rdata._base64_chunksize} @rtype: string """ line = base64.b64encode(data) return b' '.join([line[i:i + chunksize] for i in range(0, len(line), chunksize)]).decode() __escaped = bytearray(b'"\\') def _escapify(qstring): """Escape the characters in a quoted string which need it. @param qstring: the string @type qstring: string @returns: the escaped string @rtype: string """ if isinstance(qstring, text_type): qstring = qstring.encode() if not isinstance(qstring, bytearray): qstring = bytearray(qstring) text = '' for c in qstring: if c in __escaped: text += '\\' + chr(c) elif c >= 0x20 and c < 0x7F: text += chr(c) else: text += '\\%03d' % c return text def _truncate_bitmap(what): """Determine the index of greatest byte that isn't all zeros, and return the bitmap that contains all the bytes less than that index. @param what: a string of octets representing a bitmap. @type what: string @rtype: string """ for i in xrange(len(what) - 1, -1, -1): if what[i] != 0: return what[0: i + 1] return what[0:1] class Rdata(object): """Base class for all DNS rdata types. """ __slots__ = ['rdclass', 'rdtype'] def __init__(self, rdclass, rdtype): """Initialize an rdata. @param rdclass: The rdata class @type rdclass: int @param rdtype: The rdata type @type rdtype: int """ self.rdclass = rdclass self.rdtype = rdtype def covers(self): """DNS SIG/RRSIG rdatas apply to a specific type; this type is returned by the covers() function. If the rdata type is not SIG or RRSIG, dns.rdatatype.NONE is returned. This is useful when creating rdatasets, allowing the rdataset to contain only RRSIGs of a particular type, e.g. RRSIG(NS). @rtype: int """ return dns.rdatatype.NONE def extended_rdatatype(self): """Return a 32-bit type value, the least significant 16 bits of which are the ordinary DNS type, and the upper 16 bits of which are the "covered" type, if any. @rtype: int """ return self.covers() << 16 \| self.rdtype def to_text(self, origin=None, relativize=True, kw): """Convert an rdata to text format. @rtype: string """ raise NotImplementedError def to_wire(self, file, compress=None, origin=None): """Convert an rdata to wire format. @rtype: string """ raise NotImplementedError def to_digestable(self, origin=None): """Convert rdata to a format suitable for digesting in hashes. This is also the DNSSEC canonical form.""" f = BytesIO() self.to_wire(f, None, origin) return f.getvalue() def validate(self): """Check that the current contents of the rdata's fields are valid. If you change an rdata by assigning to its fields, it is a good idea to call validate() when you are done making changes. """ dns.rdata.from_text(self.rdclass, self.rdtype, self.to_text()) def __repr__(self): covers = self.covers() if covers == dns.rdatatype.NONE: ctext = '' else: ctext = '(' + dns.rdatatype.to_text(covers) + ')' return '<DNS ' + dns.rdataclass.to_text(self.rdclass) + ' ' + \ dns.rdatatype.to_text(self.rdtype) + ctext + ' rdata: ' + \ str(self) + '>' def __str__(self): return self.to_text() def _cmp(self, other): """Compare an rdata with another rdata of the same rdtype and rdclass. Return < 0 if self < other in the DNSSEC ordering, 0 if self == other, and > 0 if self > other. """ our = self.to_digestable(dns.name.root) their = other.to_digestable(dns.name.root) if our == their: return 0 if our > their: return 1 return -1 def __eq__(self, other): if not isinstance(other, Rdata): return False if self.rdclass != other.rdclass or self.rdtype != other.rdtype: return False return self._cmp(other) == 0 def __ne__(self, other): if not isinstance(other, Rdata): return True if self.rdclass != other.rdclass or self.rdtype != other.rdtype: return True return self._cmp(other) != 0 def __lt__(self, other): if not isinstance(other, Rdata) or \ self.rdclass != other.rdclass or self.rdtype != other.rdtype: return NotImplemented return self._cmp(other) < 0 def __le__(self, other): if not isinstance(other, Rdata) or \ self.rdclass != other.rdclass or self.rdtype != other.rdtype: return NotImplemented return self._cmp(other) <= 0 def __ge__(self, other): if not isinstance(other, Rdata) or \ self.rdclass != other.rdclass or self.rdtype != other.rdtype: return NotImplemented return self._cmp(other) >= 0 def __gt__(self, other): if not isinstance(other, Rdata) or \ self.rdclass != other.rdclass or self.rdtype != other.rdtype: return NotImplemented return self._cmp(other) > 0 def __hash__(self): return hash(self.to_digestable(dns.name.root)) @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): """Build an rdata object from text format. @param rdclass: The rdata class @type rdclass: int @param rdtype: The rdata type @type rdtype: int @param tok: The tokenizer @type tok: dns.tokenizer.Tokenizer @param origin: The origin to use for relative names @type origin: dns.name.Name @param relativize: should names be relativized? @type relativize: bool @rtype: dns.rdata.Rdata instance """ raise NotImplementedError @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): """Build an rdata object from wire format @param rdclass: The rdata class @type rdclass: int @param rdtype: The rdata type @type rdtype: int @param wire: The wire-format message @type wire: string @param current: The offset in wire of the beginning of the rdata. @type current: int @param rdlen: The length of the wire-format rdata @type rdlen: int @param origin: The origin to use for relative names @type origin: dns.name.Name @rtype: dns.rdata.Rdata instance """ raise NotImplementedError def choose_relativity(self, origin=None, relativize=True): """Convert any domain names in the rdata to the specified relativization. """ pass class GenericRdata(Rdata): """Generate Rdata Class This class is used for rdata types for which we have no better implementation. It implements the DNS "unknown RRs" scheme. """ __slots__ = ['data'] def __init__(self, rdclass, rdtype, data): super(GenericRdata, self).__init__(rdclass, rdtype) self.data = data def to_text(self, origin=None, relativize=True, kw): return r'\# %d ' % len(self.data) + _hexify(self.data) @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): token = tok.get() if not token.is_identifier() or token.value != '\#': raise dns.exception.SyntaxError( r'generic rdata does not start with \#') length = tok.get_int() chunks = [] while 1: token = tok.get() if token.is_eol_or_eof(): break chunks.append(token.value.encode()) hex = b''.join(chunks) data = binascii.unhexlify(hex) if len(data) != length: raise dns.exception.SyntaxError( 'generic rdata hex data has wrong length') return cls(rdclass, rdtype, data) def to_wire(self, file, compress=None, origin=None): file.write(self.data) @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): return cls(rdclass, rdtype, wire[current: current + rdlen]) _rdata_modules = {} _module_prefix = 'dns.rdtypes' def get_rdata_class(rdclass, rdtype): def import_module(name): mod = __import__(name) components = name.split('.') for comp in components[1:]: mod = getattr(mod, comp) return mod mod = _rdata_modules.get((rdclass, rdtype)) rdclass_text = dns.rdataclass.to_text(rdclass) rdtype_text = dns.rdatatype.to_text(rdtype) rdtype_text = rdtype_text.replace('-', '_') if not mod: mod = _rdata_modules.get((dns.rdatatype.ANY, rdtype)) if not mod: try: mod = import_module('.'.join([_module_prefix, rdclass_text, rdtype_text])) _rdata_modules[(rdclass, rdtype)] = mod except ImportError: try: mod = import_module('.'.join([_module_prefix, 'ANY', rdtype_text])) _rdata_modules[(dns.rdataclass.ANY, rdtype)] = mod except ImportError: mod = None if mod: cls = getattr(mod, rdtype_text) else: cls = GenericRdata return cls def from_text(rdclass, rdtype, tok, origin=None, relativize=True): """Build an rdata object from text format. This function attempts to dynamically load a class which implements the specified rdata class and type. If there is no class-and-type-specific implementation, the GenericRdata class is used. Once a class is chosen, its from_text() class method is called with the parameters to this function. If I{tok} is a string, then a tokenizer is created and the string is used as its input. @param rdclass: The rdata class @type rdclass: int @param rdtype: The rdata type @type rdtype: int @param tok: The tokenizer or input text @type tok: dns.tokenizer.Tokenizer or string @param origin: The origin to use for relative names @type origin: dns.name.Name @param relativize: Should names be relativized? @type relativize: bool @rtype: dns.rdata.Rdata instance""" if isinstance(tok, string_types): tok = dns.tokenizer.Tokenizer(tok) cls = get_rdata_class(rdclass, rdtype) if cls != GenericRdata: # peek at first token token = tok.get() tok.unget(token) if token.is_identifier() and \ token.value == r'\#': # # Known type using the generic syntax. Extract the # wire form from the generic syntax, and then run # from_wire on it. # rdata = GenericRdata.from_text(rdclass, rdtype, tok, origin, relativize) return from_wire(rdclass, rdtype, rdata.data, 0, len(rdata.data), origin) return cls.from_text(rdclass, rdtype, tok, origin, relativize) def from_wire(rdclass, rdtype, wire, current, rdlen, origin=None): """Build an rdata object from wire format This function attempts to dynamically load a class which implements the specified rdata class and type. If there is no class-and-type-specific implementation, the GenericRdata class is used. Once a class is chosen, its from_wire() class method is called with the parameters to this function. @param rdclass: The rdata class @type rdclass: int @param rdtype: The rdata type @type rdtype: int @param wire: The wire-format message @type wire: string @param current: The offset in wire of the beginning of the rdata. @type current: int @param rdlen: The length of the wire-format rdata @type rdlen: int @param origin: The origin to use for relative names @type origin: dns.name.Name @rtype: dns.rdata.Rdata instance""" wire = dns.wiredata.maybe_wrap(wire) cls = get_rdata_class(rdclass, rdtype) return cls.from_wire(rdclass, rdtype, wire, current, rdlen, origin) Back

Edit File : rdata.py | Size : 14.65 KB

# Copyright (C) 2001-2007, 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.

"""DNS rdata.

@var _rdata_modules: A dictionary mapping a (rdclass, rdtype) tuple to
the module which implements that type.
@type _rdata_modules: dict
@var _module_prefix: The prefix to use when forming modules names.  The
default is 'dns.rdtypes'.  Changing this value will break the library.
@type _module_prefix: string
@var _hex_chunk: At most this many octets that will be represented in each
chunk of hexstring that _hexify() produces before whitespace occurs.
@type _hex_chunk: int"""

from io import BytesIO
import base64
import binascii

import dns.exception
import dns.name
import dns.rdataclass
import dns.rdatatype
import dns.tokenizer
import dns.wiredata
from ._compat import xrange, string_types, text_type

_hex_chunksize = 32

def _hexify(data, chunksize=_hex_chunksize):
    """Convert a binary string into its hex encoding, broken up into chunks
    of I{chunksize} characters separated by a space.

@param data: the binary string
    @type data: string
    @param chunksize: the chunk size.  Default is L{dns.rdata._hex_chunksize}
    @rtype: string
    """

line = binascii.hexlify(data)
    return b' '.join([line[i:i + chunksize]
                      for i
                      in range(0, len(line), chunksize)]).decode()

_base64_chunksize = 32

def _base64ify(data, chunksize=_base64_chunksize):
    """Convert a binary string into its base64 encoding, broken up into chunks
    of I{chunksize} characters separated by a space.

@param data: the binary string
    @type data: string
    @param chunksize: the chunk size.  Default is
    L{dns.rdata._base64_chunksize}
    @rtype: string
    """

line = base64.b64encode(data)
    return b' '.join([line[i:i + chunksize]
                      for i
                      in range(0, len(line), chunksize)]).decode()

__escaped = bytearray(b'"\\')

def _escapify(qstring):
    """Escape the characters in a quoted string which need it.

@param qstring: the string
    @type qstring: string
    @returns: the escaped string
    @rtype: string
    """

if isinstance(qstring, text_type):
        qstring = qstring.encode()
    if not isinstance(qstring, bytearray):
        qstring = bytearray(qstring)

text = ''
    for c in qstring:
        if c in __escaped:
            text += '\\' + chr(c)
        elif c >= 0x20 and c < 0x7F:
            text += chr(c)
        else:
            text += '\\%03d' % c
    return text

def _truncate_bitmap(what):
    """Determine the index of greatest byte that isn't all zeros, and
    return the bitmap that contains all the bytes less than that index.

@param what: a string of octets representing a bitmap.
    @type what: string
    @rtype: string
    """

for i in xrange(len(what) - 1, -1, -1):
        if what[i] != 0:
            return what[0: i + 1]
    return what[0:1]

class Rdata(object):

"""Base class for all DNS rdata types.
    """

__slots__ = ['rdclass', 'rdtype']

def __init__(self, rdclass, rdtype):
        """Initialize an rdata.
        @param rdclass: The rdata class
        @type rdclass: int
        @param rdtype: The rdata type
        @type rdtype: int
        """

self.rdclass = rdclass
        self.rdtype = rdtype

def covers(self):
        """DNS SIG/RRSIG rdatas apply to a specific type; this type is
        returned by the covers() function.  If the rdata type is not
        SIG or RRSIG, dns.rdatatype.NONE is returned.  This is useful when
        creating rdatasets, allowing the rdataset to contain only RRSIGs
        of a particular type, e.g. RRSIG(NS).
        @rtype: int
        """

return dns.rdatatype.NONE

def extended_rdatatype(self):
        """Return a 32-bit type value, the least significant 16 bits of
        which are the ordinary DNS type, and the upper 16 bits of which are
        the "covered" type, if any.
        @rtype: int
        """

return self.covers() << 16 | self.rdtype

def to_text(self, origin=None, relativize=True, **kw):
        """Convert an rdata to text format.
        @rtype: string
        """
        raise NotImplementedError

def to_wire(self, file, compress=None, origin=None):
        """Convert an rdata to wire format.
        @rtype: string
        """

raise NotImplementedError

def to_digestable(self, origin=None):
        """Convert rdata to a format suitable for digesting in hashes.  This
        is also the DNSSEC canonical form."""
        f = BytesIO()
        self.to_wire(f, None, origin)
        return f.getvalue()

def validate(self):
        """Check that the current contents of the rdata's fields are
        valid.  If you change an rdata by assigning to its fields,
        it is a good idea to call validate() when you are done making
        changes.
        """
        dns.rdata.from_text(self.rdclass, self.rdtype, self.to_text())

def __repr__(self):
        covers = self.covers()
        if covers == dns.rdatatype.NONE:
            ctext = ''
        else:
            ctext = '(' + dns.rdatatype.to_text(covers) + ')'
        return '<DNS ' + dns.rdataclass.to_text(self.rdclass) + ' ' + \
               dns.rdatatype.to_text(self.rdtype) + ctext + ' rdata: ' + \
               str(self) + '>'

def __str__(self):
        return self.to_text()

def _cmp(self, other):
        """Compare an rdata with another rdata of the same rdtype and
        rdclass.  Return < 0 if self < other in the DNSSEC ordering,
        0 if self == other, and > 0 if self > other.
        """
        our = self.to_digestable(dns.name.root)
        their = other.to_digestable(dns.name.root)
        if our == their:
            return 0
        if our > their:
            return 1

return -1

def __eq__(self, other):
        if not isinstance(other, Rdata):
            return False
        if self.rdclass != other.rdclass or self.rdtype != other.rdtype:
            return False
        return self._cmp(other) == 0

def __ne__(self, other):
        if not isinstance(other, Rdata):
            return True
        if self.rdclass != other.rdclass or self.rdtype != other.rdtype:
            return True
        return self._cmp(other) != 0

def __lt__(self, other):
        if not isinstance(other, Rdata) or \
                self.rdclass != other.rdclass or self.rdtype != other.rdtype:

return NotImplemented
        return self._cmp(other) < 0

def __le__(self, other):
        if not isinstance(other, Rdata) or \
                self.rdclass != other.rdclass or self.rdtype != other.rdtype:
            return NotImplemented
        return self._cmp(other) <= 0

def __ge__(self, other):
        if not isinstance(other, Rdata) or \
                self.rdclass != other.rdclass or self.rdtype != other.rdtype:
            return NotImplemented
        return self._cmp(other) >= 0

def __gt__(self, other):
        if not isinstance(other, Rdata) or \
                self.rdclass != other.rdclass or self.rdtype != other.rdtype:
            return NotImplemented
        return self._cmp(other) > 0

def __hash__(self):
        return hash(self.to_digestable(dns.name.root))

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        """Build an rdata object from text format.

@param rdclass: The rdata class
        @type rdclass: int
        @param rdtype: The rdata type
        @type rdtype: int
        @param tok: The tokenizer
        @type tok: dns.tokenizer.Tokenizer
        @param origin: The origin to use for relative names
        @type origin: dns.name.Name
        @param relativize: should names be relativized?
        @type relativize: bool
        @rtype: dns.rdata.Rdata instance
        """

raise NotImplementedError

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        """Build an rdata object from wire format

@param rdclass: The rdata class
        @type rdclass: int
        @param rdtype: The rdata type
        @type rdtype: int
        @param wire: The wire-format message
        @type wire: string
        @param current: The offset in wire of the beginning of the rdata.
        @type current: int
        @param rdlen: The length of the wire-format rdata
        @type rdlen: int
        @param origin: The origin to use for relative names
        @type origin: dns.name.Name
        @rtype: dns.rdata.Rdata instance
        """

raise NotImplementedError

def choose_relativity(self, origin=None, relativize=True):
        """Convert any domain names in the rdata to the specified
        relativization.
        """

pass

class GenericRdata(Rdata):

"""Generate Rdata Class

This class is used for rdata types for which we have no better
    implementation.  It implements the DNS "unknown RRs" scheme.
    """

__slots__ = ['data']

def __init__(self, rdclass, rdtype, data):
        super(GenericRdata, self).__init__(rdclass, rdtype)
        self.data = data

def to_text(self, origin=None, relativize=True, **kw):
        return r'\# %d ' % len(self.data) + _hexify(self.data)

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        token = tok.get()
        if not token.is_identifier() or token.value != '\#':
            raise dns.exception.SyntaxError(
                r'generic rdata does not start with \#')
        length = tok.get_int()
        chunks = []
        while 1:
            token = tok.get()
            if token.is_eol_or_eof():
                break
            chunks.append(token.value.encode())
        hex = b''.join(chunks)
        data = binascii.unhexlify(hex)
        if len(data) != length:
            raise dns.exception.SyntaxError(
                'generic rdata hex data has wrong length')
        return cls(rdclass, rdtype, data)

def to_wire(self, file, compress=None, origin=None):
        file.write(self.data)

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        return cls(rdclass, rdtype, wire[current: current + rdlen])

_rdata_modules = {}
_module_prefix = 'dns.rdtypes'

def get_rdata_class(rdclass, rdtype):

def import_module(name):
        mod = __import__(name)
        components = name.split('.')
        for comp in components[1:]:
            mod = getattr(mod, comp)
        return mod

mod = _rdata_modules.get((rdclass, rdtype))
    rdclass_text = dns.rdataclass.to_text(rdclass)
    rdtype_text = dns.rdatatype.to_text(rdtype)
    rdtype_text = rdtype_text.replace('-', '_')
    if not mod:
        mod = _rdata_modules.get((dns.rdatatype.ANY, rdtype))
        if not mod:
            try:
                mod = import_module('.'.join([_module_prefix,
                                              rdclass_text, rdtype_text]))
                _rdata_modules[(rdclass, rdtype)] = mod
            except ImportError:
                try:
                    mod = import_module('.'.join([_module_prefix,
                                                  'ANY', rdtype_text]))
                    _rdata_modules[(dns.rdataclass.ANY, rdtype)] = mod
                except ImportError:
                    mod = None
    if mod:
        cls = getattr(mod, rdtype_text)
    else:
        cls = GenericRdata
    return cls

def from_text(rdclass, rdtype, tok, origin=None, relativize=True):
    """Build an rdata object from text format.

This function attempts to dynamically load a class which
    implements the specified rdata class and type.  If there is no
    class-and-type-specific implementation, the GenericRdata class
    is used.

Once a class is chosen, its from_text() class method is called
    with the parameters to this function.

If I{tok} is a string, then a tokenizer is created and the string
    is used as its input.

@param rdclass: The rdata class
    @type rdclass: int
    @param rdtype: The rdata type
    @type rdtype: int
    @param tok: The tokenizer or input text
    @type tok: dns.tokenizer.Tokenizer or string
    @param origin: The origin to use for relative names
    @type origin: dns.name.Name
    @param relativize: Should names be relativized?
    @type relativize: bool
    @rtype: dns.rdata.Rdata instance"""

if isinstance(tok, string_types):
        tok = dns.tokenizer.Tokenizer(tok)
    cls = get_rdata_class(rdclass, rdtype)
    if cls != GenericRdata:
        # peek at first token
        token = tok.get()
        tok.unget(token)
        if token.is_identifier() and \
           token.value == r'\#':
            #
            # Known type using the generic syntax.  Extract the
            # wire form from the generic syntax, and then run
            # from_wire on it.
            #
            rdata = GenericRdata.from_text(rdclass, rdtype, tok, origin,
                                           relativize)
            return from_wire(rdclass, rdtype, rdata.data, 0, len(rdata.data),
                             origin)
    return cls.from_text(rdclass, rdtype, tok, origin, relativize)

def from_wire(rdclass, rdtype, wire, current, rdlen, origin=None):
    """Build an rdata object from wire format

Once a class is chosen, its from_wire() class method is called
    with the parameters to this function.

@param rdclass: The rdata class
    @type rdclass: int
    @param rdtype: The rdata type
    @type rdtype: int
    @param wire: The wire-format message
    @type wire: string
    @param current: The offset in wire of the beginning of the rdata.
    @type current: int
    @param rdlen: The length of the wire-format rdata
    @type rdlen: int
    @param origin: The origin to use for relative names
    @type origin: dns.name.Name
    @rtype: dns.rdata.Rdata instance"""

wire = dns.wiredata.maybe_wrap(wire)
    cls = get_rdata_class(rdclass, rdtype)
    return cls.from_wire(rdclass, rdtype, wire, current, rdlen, origin)

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