# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2003-2017 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 RRsets (an RRset is a named rdataset)"""
from typing import Any, Collection, Dict, Optional, Union, cast
import dns.name
import dns.rdataclass
import dns.rdataset
import 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: dns.name.Name,
rdclass: dns.rdataclass.RdataClass,
rdtype: dns.rdatatype.RdataType,
covers: dns.rdatatype.RdataType = dns.rdatatype.NONE,
deleting: Optional[dns.rdataclass.RdataClass] = None,
):
"""Create a new RRset."""
super().__init__(rdclass, rdtype, covers)
self.name = name
self.deleting = deleting
def _clone(self):
obj = super()._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 self.deleting is not 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: "
+ self._rdata_repr()
+ ">"
)
def __str__(self):
return self.to_text()
def __eq__(self, other):
if isinstance(other, RRset):
if self.name != other.name:
return False
elif not isinstance(other, dns.rdataset.Rdataset):
return False
return super().__eq__(other)
[docs]
def match(self, *args: Any, **kwargs: Any) -> bool: # type: ignore[override]
"""Does this rrset match the specified attributes?
Behaves as :py:func:`full_match()` if the first argument is a
``dns.name.Name``, and as :py:func:`dns.rdataset.Rdataset.match()`
otherwise.
(This behavior fixes a design mistake where the signature of this
method became incompatible with that of its superclass. The fix
makes RRsets matchable as Rdatasets while preserving backwards
compatibility.)
"""
if isinstance(args[0], dns.name.Name):
return self.full_match(*args, **kwargs) # type: ignore[arg-type]
else:
return super().match(*args, **kwargs) # type: ignore[arg-type]
[docs]
def full_match(
self,
name: dns.name.Name,
rdclass: dns.rdataclass.RdataClass,
rdtype: dns.rdatatype.RdataType,
covers: dns.rdatatype.RdataType,
deleting: Optional[dns.rdataclass.RdataClass] = None,
) -> bool:
"""Returns ``True`` if this rrset matches the specified name, class,
type, covers, and deletion state.
"""
if not super().match(rdclass, rdtype, covers):
return False
if self.name != name or self.deleting != deleting:
return False
return True
# pylint: disable=arguments-differ
[docs]
def to_text( # type: ignore[override]
self,
origin: Optional[dns.name.Name] = None,
relativize: bool = True,
**kw: Dict[str, Any],
) -> str:
"""Convert the RRset into DNS zone file format.
See ``dns.name.Name.choose_relativity`` for more information
on how *origin* and *relativize* determine the way names
are emitted.
Any additional keyword arguments are passed on to the rdata
``to_text()`` method.
*origin*, a ``dns.name.Name`` or ``None``, the origin for relative
names.
*relativize*, a ``bool``. If ``True``, names will be relativized
to *origin*.
"""
return super().to_text(
self.name, origin, relativize, self.deleting, **kw # type: ignore
)
[docs]
def to_wire( # type: ignore[override]
self,
file: Any,
compress: Optional[dns.name.CompressType] = None, # type: ignore
origin: Optional[dns.name.Name] = None,
**kw: Dict[str, Any],
) -> int:
"""Convert the RRset to wire format.
All keyword arguments are passed to ``dns.rdataset.to_wire()``; see
that function for details.
Returns an ``int``, the number of records emitted.
"""
return super().to_wire(
self.name, file, compress, origin, self.deleting, **kw # type:ignore
)
# pylint: enable=arguments-differ
[docs]
def to_rdataset(self) -> dns.rdataset.Rdataset:
"""Convert an RRset into an Rdataset.
Returns a ``dns.rdataset.Rdataset``.
"""
return dns.rdataset.from_rdata_list(self.ttl, list(self))
[docs]
def from_text_list(
name: Union[dns.name.Name, str],
ttl: int,
rdclass: Union[dns.rdataclass.RdataClass, str],
rdtype: Union[dns.rdatatype.RdataType, str],
text_rdatas: Collection[str],
idna_codec: Optional[dns.name.IDNACodec] = None,
origin: Optional[dns.name.Name] = None,
relativize: bool = True,
relativize_to: Optional[dns.name.Name] = None,
) -> RRset:
"""Create an RRset with the specified name, TTL, class, and type, and with
the specified list of rdatas in text format.
*idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
encoder/decoder to use; if ``None``, the default IDNA 2003
encoder/decoder is used.
*origin*, a ``dns.name.Name`` (or ``None``), the
origin to use for relative names.
*relativize*, a ``bool``. If true, name will be relativized.
*relativize_to*, a ``dns.name.Name`` (or ``None``), the origin to use
when relativizing names. If not set, the *origin* value will be used.
Returns a ``dns.rrset.RRset`` object.
"""
if isinstance(name, str):
name = dns.name.from_text(name, None, idna_codec=idna_codec)
rdclass = dns.rdataclass.RdataClass.make(rdclass)
rdtype = dns.rdatatype.RdataType.make(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, origin, relativize, relativize_to, idna_codec
)
r.add(rd)
return r
[docs]
def from_text(
name: Union[dns.name.Name, str],
ttl: int,
rdclass: Union[dns.rdataclass.RdataClass, str],
rdtype: Union[dns.rdatatype.RdataType, str],
*text_rdatas: Any,
) -> RRset:
"""Create an RRset with the specified name, TTL, class, and type and with
the specified rdatas in text format.
Returns a ``dns.rrset.RRset`` object.
"""
return from_text_list(
name, ttl, rdclass, rdtype, cast(Collection[str], text_rdatas)
)
[docs]
def from_rdata_list(
name: Union[dns.name.Name, str],
ttl: int,
rdatas: Collection[dns.rdata.Rdata],
idna_codec: Optional[dns.name.IDNACodec] = None,
) -> RRset:
"""Create an RRset with the specified name and TTL, and with
the specified list of rdata objects.
*idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
encoder/decoder to use; if ``None``, the default IDNA 2003
encoder/decoder is used.
Returns a ``dns.rrset.RRset`` object.
"""
if isinstance(name, str):
name = dns.name.from_text(name, None, idna_codec=idna_codec)
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)
r.add(rd)
assert r is not None
return r
[docs]
def from_rdata(name: Union[dns.name.Name, str], ttl: int, *rdatas: Any) -> RRset:
"""Create an RRset with the specified name and TTL, and with
the specified rdata objects.
Returns a ``dns.rrset.RRset`` object.
"""
return from_rdata_list(name, ttl, cast(Collection[dns.rdata.Rdata], rdatas))