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286 lines
9.0 KiB
286 lines
9.0 KiB
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2003-2017 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""DNS RRsets (an RRset is a named rdataset)"""
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from typing import Any, Collection, Dict, Optional, Union, cast
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import dns.name
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import dns.rdataclass
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import dns.rdataset
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import dns.renderer
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class RRset(dns.rdataset.Rdataset):
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"""A DNS RRset (named rdataset).
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RRset inherits from Rdataset, and RRsets can be treated as
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Rdatasets in most cases. There are, however, a few notable
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exceptions. RRsets have different to_wire() and to_text() method
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arguments, reflecting the fact that RRsets always have an owner
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name.
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"""
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__slots__ = ["name", "deleting"]
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def __init__(
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self,
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name: dns.name.Name,
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rdclass: dns.rdataclass.RdataClass,
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rdtype: dns.rdatatype.RdataType,
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covers: dns.rdatatype.RdataType = dns.rdatatype.NONE,
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deleting: Optional[dns.rdataclass.RdataClass] = None,
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):
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"""Create a new RRset."""
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super().__init__(rdclass, rdtype, covers)
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self.name = name
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self.deleting = deleting
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def _clone(self):
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obj = super()._clone()
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obj.name = self.name
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obj.deleting = self.deleting
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return obj
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def __repr__(self):
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if self.covers == 0:
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ctext = ""
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else:
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ctext = "(" + dns.rdatatype.to_text(self.covers) + ")"
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if self.deleting is not None:
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dtext = " delete=" + dns.rdataclass.to_text(self.deleting)
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else:
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dtext = ""
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return (
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"<DNS "
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+ str(self.name)
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+ " "
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+ dns.rdataclass.to_text(self.rdclass)
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+ " "
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+ dns.rdatatype.to_text(self.rdtype)
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+ ctext
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+ dtext
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+ " RRset: "
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+ self._rdata_repr()
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+ ">"
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)
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def __str__(self):
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return self.to_text()
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def __eq__(self, other):
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if isinstance(other, RRset):
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if self.name != other.name:
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return False
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elif not isinstance(other, dns.rdataset.Rdataset):
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return False
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return super().__eq__(other)
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def match(self, *args: Any, **kwargs: Any) -> bool: # type: ignore[override]
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"""Does this rrset match the specified attributes?
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Behaves as :py:func:`full_match()` if the first argument is a
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``dns.name.Name``, and as :py:func:`dns.rdataset.Rdataset.match()`
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otherwise.
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(This behavior fixes a design mistake where the signature of this
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method became incompatible with that of its superclass. The fix
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makes RRsets matchable as Rdatasets while preserving backwards
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compatibility.)
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"""
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if isinstance(args[0], dns.name.Name):
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return self.full_match(*args, **kwargs) # type: ignore[arg-type]
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else:
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return super().match(*args, **kwargs) # type: ignore[arg-type]
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def full_match(
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self,
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name: dns.name.Name,
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rdclass: dns.rdataclass.RdataClass,
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rdtype: dns.rdatatype.RdataType,
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covers: dns.rdatatype.RdataType,
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deleting: Optional[dns.rdataclass.RdataClass] = None,
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) -> bool:
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"""Returns ``True`` if this rrset matches the specified name, class,
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type, covers, and deletion state.
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"""
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if not super().match(rdclass, rdtype, covers):
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return False
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if self.name != name or self.deleting != deleting:
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return False
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return True
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# pylint: disable=arguments-differ
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def to_text( # type: ignore[override]
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self,
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origin: Optional[dns.name.Name] = None,
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relativize: bool = True,
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**kw: Dict[str, Any],
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) -> str:
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"""Convert the RRset into DNS zone file format.
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See ``dns.name.Name.choose_relativity`` for more information
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on how *origin* and *relativize* determine the way names
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are emitted.
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Any additional keyword arguments are passed on to the rdata
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``to_text()`` method.
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*origin*, a ``dns.name.Name`` or ``None``, the origin for relative
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names.
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*relativize*, a ``bool``. If ``True``, names will be relativized
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to *origin*.
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"""
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return super().to_text(
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self.name, origin, relativize, self.deleting, **kw # type: ignore
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)
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def to_wire( # type: ignore[override]
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self,
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file: Any,
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compress: Optional[dns.name.CompressType] = None, # type: ignore
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origin: Optional[dns.name.Name] = None,
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**kw: Dict[str, Any],
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) -> int:
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"""Convert the RRset to wire format.
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All keyword arguments are passed to ``dns.rdataset.to_wire()``; see
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that function for details.
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Returns an ``int``, the number of records emitted.
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"""
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return super().to_wire(
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self.name, file, compress, origin, self.deleting, **kw # type:ignore
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)
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# pylint: enable=arguments-differ
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def to_rdataset(self) -> dns.rdataset.Rdataset:
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"""Convert an RRset into an Rdataset.
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Returns a ``dns.rdataset.Rdataset``.
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"""
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return dns.rdataset.from_rdata_list(self.ttl, list(self))
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def from_text_list(
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name: Union[dns.name.Name, str],
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ttl: int,
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rdclass: Union[dns.rdataclass.RdataClass, str],
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rdtype: Union[dns.rdatatype.RdataType, str],
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text_rdatas: Collection[str],
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idna_codec: Optional[dns.name.IDNACodec] = None,
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origin: Optional[dns.name.Name] = None,
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relativize: bool = True,
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relativize_to: Optional[dns.name.Name] = None,
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) -> RRset:
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"""Create an RRset with the specified name, TTL, class, and type, and with
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the specified list of rdatas in text format.
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*idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
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encoder/decoder to use; if ``None``, the default IDNA 2003
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encoder/decoder is used.
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*origin*, a ``dns.name.Name`` (or ``None``), the
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origin to use for relative names.
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*relativize*, a ``bool``. If true, name will be relativized.
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*relativize_to*, a ``dns.name.Name`` (or ``None``), the origin to use
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when relativizing names. If not set, the *origin* value will be used.
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Returns a ``dns.rrset.RRset`` object.
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"""
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if isinstance(name, str):
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name = dns.name.from_text(name, None, idna_codec=idna_codec)
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rdclass = dns.rdataclass.RdataClass.make(rdclass)
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rdtype = dns.rdatatype.RdataType.make(rdtype)
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r = RRset(name, rdclass, rdtype)
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r.update_ttl(ttl)
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for t in text_rdatas:
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rd = dns.rdata.from_text(
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r.rdclass, r.rdtype, t, origin, relativize, relativize_to, idna_codec
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)
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r.add(rd)
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return r
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def from_text(
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name: Union[dns.name.Name, str],
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ttl: int,
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rdclass: Union[dns.rdataclass.RdataClass, str],
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rdtype: Union[dns.rdatatype.RdataType, str],
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*text_rdatas: Any,
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) -> RRset:
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"""Create an RRset with the specified name, TTL, class, and type and with
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the specified rdatas in text format.
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Returns a ``dns.rrset.RRset`` object.
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"""
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return from_text_list(
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name, ttl, rdclass, rdtype, cast(Collection[str], text_rdatas)
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)
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def from_rdata_list(
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name: Union[dns.name.Name, str],
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ttl: int,
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rdatas: Collection[dns.rdata.Rdata],
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idna_codec: Optional[dns.name.IDNACodec] = None,
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) -> RRset:
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"""Create an RRset with the specified name and TTL, and with
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the specified list of rdata objects.
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*idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
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encoder/decoder to use; if ``None``, the default IDNA 2003
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encoder/decoder is used.
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Returns a ``dns.rrset.RRset`` object.
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"""
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if isinstance(name, str):
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name = dns.name.from_text(name, None, idna_codec=idna_codec)
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if len(rdatas) == 0:
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raise ValueError("rdata list must not be empty")
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r = None
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for rd in rdatas:
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if r is None:
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r = RRset(name, rd.rdclass, rd.rdtype)
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r.update_ttl(ttl)
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r.add(rd)
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assert r is not None
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return r
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def from_rdata(name: Union[dns.name.Name, str], ttl: int, *rdatas: Any) -> RRset:
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"""Create an RRset with the specified name and TTL, and with
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the specified rdata objects.
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Returns a ``dns.rrset.RRset`` object.
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"""
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return from_rdata_list(name, ttl, cast(Collection[dns.rdata.Rdata], rdatas))
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