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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license # Copyright (C) 2001-2017 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 rdatasets (an rdataset is a set of rdatas of a given type and class)""" import random from io import StringIO import struct import dns.exception import dns.rdatatype import dns.rdataclass import dns.rdata import dns.set from ._compat import string_types # define SimpleSet here for backwards compatibility SimpleSet = dns.set.Set class DifferingCovers(dns.exception.DNSException): """An attempt was made to add a DNS SIG/RRSIG whose covered type is not the same as that of the other rdatas in the rdataset.""" class IncompatibleTypes(dns.exception.DNSException): """An attempt was made to add DNS RR data of an incompatible type.""" class Rdataset(dns.set.Set): """A DNS rdataset.""" __slots__ = ['rdclass', 'rdtype', 'covers', 'ttl'] def __init__(self, rdclass, rdtype, covers=dns.rdatatype.NONE, ttl=0): """Create a new rdataset of the specified class and type. *rdclass*, an ``int``, the rdataclass. *rdtype*, an ``int``, the rdatatype. *covers*, an ``int``, the covered rdatatype. *ttl*, an ``int``, the TTL. """ super(Rdataset, self).__init__() self.rdclass = rdclass self.rdtype = rdtype self.covers = covers self.ttl = ttl def _clone(self): obj = super(Rdataset, self)._clone() obj.rdclass = self.rdclass obj.rdtype = self.rdtype obj.covers = self.covers obj.ttl = self.ttl return obj def update_ttl(self, ttl): """Perform TTL minimization. Set the TTL of the rdataset to be the lesser of the set's current TTL or the specified TTL. If the set contains no rdatas, set the TTL to the specified TTL. *ttl*, an ``int``. """ if len(self) == 0: self.ttl = ttl elif ttl < self.ttl: self.ttl = ttl def add(self, rd, ttl=None): """Add the specified rdata to the rdataset. If the optional *ttl* parameter is supplied, then ``self.update_ttl(ttl)`` will be called prior to adding the rdata. *rd*, a ``dns.rdata.Rdata``, the rdata *ttl*, an ``int``, the TTL. Raises ``dns.rdataset.IncompatibleTypes`` if the type and class do not match the type and class of the rdataset. Raises ``dns.rdataset.DifferingCovers`` if the type is a signature type and the covered type does not match that of the rdataset. """ # # If we're adding a signature, do some special handling to # check that the signature covers the same type as the # other rdatas in this rdataset. If this is the first rdata # in the set, initialize the covers field. # if self.rdclass != rd.rdclass or self.rdtype != rd.rdtype: raise IncompatibleTypes if ttl is not None: self.update_ttl(ttl) if self.rdtype == dns.rdatatype.RRSIG or \ self.rdtype == dns.rdatatype.SIG: covers = rd.covers() if len(self) == 0 and self.covers == dns.rdatatype.NONE: self.covers = covers elif self.covers != covers: raise DifferingCovers if dns.rdatatype.is_singleton(rd.rdtype) and len(self) > 0: self.clear() super(Rdataset, self).add(rd) def union_update(self, other): self.update_ttl(other.ttl) super(Rdataset, self).union_update(other) def intersection_update(self, other): self.update_ttl(other.ttl) super(Rdataset, self).intersection_update(other) def update(self, other): """Add all rdatas in other to self. *other*, a ``dns.rdataset.Rdataset``, the rdataset from which to update. """ self.update_ttl(other.ttl) super(Rdataset, self).update(other) def __repr__(self): if self.covers == 0: ctext = '' else: ctext = '(' + dns.rdatatype.to_text(self.covers) + ')' return '<DNS ' + dns.rdataclass.to_text(self.rdclass) + ' ' + \ dns.rdatatype.to_text(self.rdtype) + ctext + ' rdataset>' def __str__(self): return self.to_text() def __eq__(self, other): if not isinstance(other, Rdataset): return False if self.rdclass != other.rdclass or \ self.rdtype != other.rdtype or \ self.covers != other.covers: return False return super(Rdataset, self).__eq__(other) def __ne__(self, other): return not self.__eq__(other) def to_text(self, name=None, origin=None, relativize=True, override_rdclass=None, **kw): """Convert the rdataset into DNS master 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. *name*, a ``dns.name.Name``. If name is not ``None``, emit RRs with *name* as the owner name. *origin*, a ``dns.name.Name`` or ``None``, the origin for relative names. *relativize*, a ``bool``. If ``True``, names will be relativized to *origin*. """ if name is not None: name = name.choose_relativity(origin, relativize) ntext = str(name) pad = ' ' else: ntext = '' pad = '' s = StringIO() if override_rdclass is not None: rdclass = override_rdclass else: rdclass = self.rdclass if len(self) == 0: # # Empty rdatasets are used for the question section, and in # some dynamic updates, so we don't need to print out the TTL # (which is meaningless anyway). # s.write(u'{}{}{} {}\n'.format(ntext, pad, dns.rdataclass.to_text(rdclass), dns.rdatatype.to_text(self.rdtype))) else: for rd in self: s.write(u'%s%s%d %s %s %s\n' % (ntext, pad, self.ttl, dns.rdataclass.to_text(rdclass), dns.rdatatype.to_text(self.rdtype), rd.to_text(origin=origin, relativize=relativize, **kw))) # # We strip off the final \n for the caller's convenience in printing # return s.getvalue()[:-1] def to_wire(self, name, file, compress=None, origin=None, override_rdclass=None, want_shuffle=True): """Convert the rdataset to wire format. *name*, a ``dns.name.Name`` is the owner name to use. *file* is the file where the name is emitted (typically a BytesIO file). *compress*, a ``dict``, is the compression table to use. If ``None`` (the default), names will not be compressed. *origin* is a ``dns.name.Name`` or ``None``. If the name is relative and origin is not ``None``, then *origin* will be appended to it. *override_rdclass*, an ``int``, is used as the class instead of the class of the rdataset. This is useful when rendering rdatasets associated with dynamic updates. *want_shuffle*, a ``bool``. If ``True``, then the order of the Rdatas within the Rdataset will be shuffled before rendering. Returns an ``int``, the number of records emitted. """ if override_rdclass is not None: rdclass = override_rdclass want_shuffle = False else: rdclass = self.rdclass file.seek(0, 2) if len(self) == 0: name.to_wire(file, compress, origin) stuff = struct.pack("!HHIH", self.rdtype, rdclass, 0, 0) file.write(stuff) return 1 else: if want_shuffle: l = list(self) random.shuffle(l) else: l = self for rd in l: name.to_wire(file, compress, origin) stuff = struct.pack("!HHIH", self.rdtype, rdclass, self.ttl, 0) file.write(stuff) start = file.tell() rd.to_wire(file, compress, origin) end = file.tell() assert end - start < 65536 file.seek(start - 2) stuff = struct.pack("!H", end - start) file.write(stuff) file.seek(0, 2) return len(self) def match(self, rdclass, rdtype, covers): """Returns ``True`` if this rdataset matches the specified class, type, and covers. """ if self.rdclass == rdclass and \ self.rdtype == rdtype and \ self.covers == covers: return True return False def from_text_list(rdclass, rdtype, ttl, text_rdatas): """Create an rdataset with the specified class, type, and TTL, and with the specified list of rdatas in text format. Returns a ``dns.rdataset.Rdataset`` object. """ if isinstance(rdclass, string_types): rdclass = dns.rdataclass.from_text(rdclass) if isinstance(rdtype, string_types): rdtype = dns.rdatatype.from_text(rdtype) r = Rdataset(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 def from_text(rdclass, rdtype, ttl, *text_rdatas): """Create an rdataset with the specified class, type, and TTL, and with the specified rdatas in text format. Returns a ``dns.rdataset.Rdataset`` object. """ return from_text_list(rdclass, rdtype, ttl, text_rdatas) def from_rdata_list(ttl, rdatas): """Create an rdataset with the specified TTL, and with the specified list of rdata objects. Returns a ``dns.rdataset.Rdataset`` object. """ if len(rdatas) == 0: raise ValueError("rdata list must not be empty") r = None for rd in rdatas: if r is None: r = Rdataset(rd.rdclass, rd.rdtype) r.update_ttl(ttl) r.add(rd) return r def from_rdata(ttl, *rdatas): """Create an rdataset with the specified TTL, and with the specified rdata objects. Returns a ``dns.rdataset.Rdataset`` object. """ return from_rdata_list(ttl, rdatas)