Source code for pytomo.dns.rdtypes.nsbase

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"""NS-like base classes."""

from __future__ import absolute_import

import cStringIO

from .. import exception as dns_exception
from .. import rdata as dns_rdata
from .. import name as dns_name

[docs]class NSBase(dns_rdata.Rdata): """Base class for rdata that is like an NS record. @ivar target: the target name of the rdata @type target: dns_name.Name object""" __slots__ = ['target'] def __init__(self, rdclass, rdtype, target): super(NSBase, self).__init__(rdclass, rdtype) self.target = target
[docs] def to_text(self, origin=None, relativize=True, **kw): target = self.target.choose_relativity(origin, relativize) return str(target)
[docs] def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): target = tok.get_name() target = target.choose_relativity(origin, relativize) tok.get_eol() return cls(rdclass, rdtype, target)
from_text = classmethod(from_text)
[docs] def to_wire(self, file, compress = None, origin = None): self.target.to_wire(file, compress, origin)
[docs] def to_digestable(self, origin = None): return self.target.to_digestable(origin)
[docs] def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): (target, cused) = dns_name.from_wire(wire[: current + rdlen], current) if cused != rdlen: raise dns_exception.FormError if not origin is None: target = target.relativize(origin) return cls(rdclass, rdtype, target)
from_wire = classmethod(from_wire)
[docs] def choose_relativity(self, origin = None, relativize = True): self.target = self.target.choose_relativity(origin, relativize)
def _cmp(self, other): return cmp(self.target, other.target)
[docs]class UncompressedNS(NSBase): """Base class for rdata that is like an NS record, but whose name is not compressed when convert to DNS wire format, and whose digestable form is not downcased."""
[docs] def to_wire(self, file, compress = None, origin = None): super(UncompressedNS, self).to_wire(file, None, origin)
[docs] def to_digestable(self, origin = None): f = cStringIO.StringIO() self.to_wire(f, None, origin) return f.getvalue()