# Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc.
#
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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"""DNS RRsets (an RRset is a named rdataset)"""
from __future__ import absolute_import
from . import name as dns_name
from . import rdata as dns_rdata
from . import rdataset as dns_rdataset
from . import rdatatype as dns_rdatatype
from . import rdataclass as dns_rdataclass
#from . import renderer as dns_renderer
[docs]class RRset(dns_rdataset.Rdataset):
"""A DNS RRset (named rdataset).
RRset inherits from Rdataset, and RRsets can be treated as
Rdatasets in most cases. There are, however, a few notable
exceptions. RRsets have different to_wire() and to_text() method
arguments, reflecting the fact that RRsets always have an owner
name.
"""
__slots__ = ['name', 'deleting']
def __init__(self, name, rdclass, rdtype, covers=dns_rdatatype.NONE,
deleting=None):
"""Create a new RRset."""
super(RRset, self).__init__(rdclass, rdtype, covers)
self.name = name
self.deleting = deleting
def _clone(self):
obj = super(RRset, self)._clone()
obj.name = self.name
obj.deleting = self.deleting
return obj
def __repr__(self):
if self.covers == 0:
ctext = ''
else:
ctext = '(' + dns_rdatatype.to_text(self.covers) + ')'
if not self.deleting is None:
dtext = ' delete=' + dns_rdataclass.to_text(self.deleting)
else:
dtext = ''
return '<DNS ' + str(self.name) + ' ' + \
dns_rdataclass.to_text(self.rdclass) + ' ' + \
dns_rdatatype.to_text(self.rdtype) + ctext + dtext + ' RRset>'
def __str__(self):
return self.to_text()
def __eq__(self, other):
"""Two RRsets are equal if they have the same name and the same
rdataset
@rtype: bool"""
if not isinstance(other, RRset):
return False
if self.name != other.name:
return False
return super(RRset, self).__eq__(other)
[docs] def match(self, name, rdclass, rdtype, covers, deleting=None):
"""Returns True if this rrset matches the specified class, type,
covers, and deletion state."""
if not super(RRset, self).match(rdclass, rdtype, covers):
return False
if self.name != name or self.deleting != deleting:
return False
return True
[docs] def to_text(self, origin=None, relativize=True, **kw):
"""Convert the RRset into DNS master file format.
@see: L{dns_name.Name.choose_relativity} for more information
on how I{origin} and I{relativize} determine the way names
are emitted.
Any additional keyword arguments are passed on to the rdata
to_text() method.
@param origin: The origin for relative names, or None.
@type origin: dns_name.Name object
@param relativize: True if names should names be relativized
@type relativize: bool"""
return super(RRset, self).to_text(self.name, origin, relativize,
self.deleting, **kw)
[docs] def to_wire(self, file, compress=None, origin=None, **kw):
"""Convert the RRset to wire format."""
return super(RRset, self).to_wire(self.name, file, compress, origin,
self.deleting, **kw)
[docs] def to_rdataset(self):
"""Convert an RRset into an Rdataset.
@rtype: dns_rdataset.Rdataset object
"""
return dns_rdataset.from_rdata_list(self.ttl, list(self))
[docs]def from_text_list(name, ttl, rdclass, rdtype, text_rdatas):
"""Create an RRset with the specified name, TTL, class, and type, and with
the specified list of rdatas in text format.
@rtype: dns_rrset.RRset object
"""
if isinstance(name, (str, unicode)):
name = dns_name.from_text(name, None)
if isinstance(rdclass, (str, unicode)):
rdclass = dns_rdataclass.from_text(rdclass)
if isinstance(rdtype, (str, unicode)):
rdtype = dns_rdatatype.from_text(rdtype)
r = RRset(name, rdclass, rdtype)
r.update_ttl(ttl)
for t in text_rdatas:
rd = dns_rdata.from_text(r.rdclass, r.rdtype, t)
r.add(rd)
return r
[docs]def from_text(name, ttl, rdclass, rdtype, *text_rdatas):
"""Create an RRset with the specified name, TTL, class, and type and with
the specified rdatas in text format.
@rtype: dns_rrset.RRset object
"""
return from_text_list(name, ttl, rdclass, rdtype, text_rdatas)
[docs]def from_rdata_list(name, ttl, rdatas):
"""Create an RRset with the specified name and TTL, and with
the specified list of rdata objects.
@rtype: dns_rrset.RRset object
"""
if isinstance(name, (str, unicode)):
name = dns_name.from_text(name, None)
if len(rdatas) == 0:
raise ValueError("rdata list must not be empty")
r = None
for rd in rdatas:
if r is None:
r = RRset(name, rd.rdclass, rd.rdtype)
r.update_ttl(ttl)
first_time = False
r.add(rd)
return r
[docs]def from_rdata(name, ttl, *rdatas):
"""Create an RRset with the specified name and TTL, and with
the specified rdata objects.
@rtype: dns_rrset.RRset object
"""
return from_rdata_list(name, ttl, rdatas)