mirror of https://github.com/morpheus65535/bazarr
250 lines
9.8 KiB
Python
250 lines
9.8 KiB
Python
|
# Copyright (C) 2003-2007, 2009-2011 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 Dynamic Update Support"""
|
||
|
|
|
||
|
|
|
||
|
|
import dns.message
|
||
|
|
import dns.name
|
||
|
|
import dns.opcode
|
||
|
|
import dns.rdata
|
||
|
|
import dns.rdataclass
|
||
|
|
import dns.rdataset
|
||
|
|
import dns.tsig
|
||
|
|
from ._compat import string_types
|
||
|
|
|
||
|
|
|
||
|
|
class Update(dns.message.Message):
|
||
|
|
|
||
|
|
def __init__(self, zone, rdclass=dns.rdataclass.IN, keyring=None,
|
||
|
|
keyname=None, keyalgorithm=dns.tsig.default_algorithm):
|
||
|
|
"""Initialize a new DNS Update object.
|
||
|
|
|
||
|
|
@param zone: The zone which is being updated.
|
||
|
|
@type zone: A dns.name.Name or string
|
||
|
|
@param rdclass: The class of the zone; defaults to dns.rdataclass.IN.
|
||
|
|
@type rdclass: An int designating the class, or a string whose value
|
||
|
|
is the name of a class.
|
||
|
|
@param keyring: The TSIG keyring to use; defaults to None.
|
||
|
|
@type keyring: dict
|
||
|
|
@param keyname: The name of the TSIG key to use; defaults to None.
|
||
|
|
The key must be defined in the keyring. If a keyring is specified
|
||
|
|
but a keyname is not, then the key used will be the first key in the
|
||
|
|
keyring. Note that the order of keys in a dictionary is not defined,
|
||
|
|
so applications should supply a keyname when a keyring is used, unless
|
||
|
|
they know the keyring contains only one key.
|
||
|
|
@type keyname: dns.name.Name or string
|
||
|
|
@param keyalgorithm: The TSIG algorithm to use; defaults to
|
||
|
|
dns.tsig.default_algorithm. Constants for TSIG algorithms are defined
|
||
|
|
in dns.tsig, and the currently implemented algorithms are
|
||
|
|
HMAC_MD5, HMAC_SHA1, HMAC_SHA224, HMAC_SHA256, HMAC_SHA384, and
|
||
|
|
HMAC_SHA512.
|
||
|
|
@type keyalgorithm: string
|
||
|
|
"""
|
||
|
|
super(Update, self).__init__()
|
||
|
|
self.flags |= dns.opcode.to_flags(dns.opcode.UPDATE)
|
||
|
|
if isinstance(zone, string_types):
|
||
|
|
zone = dns.name.from_text(zone)
|
||
|
|
self.origin = zone
|
||
|
|
if isinstance(rdclass, string_types):
|
||
|
|
rdclass = dns.rdataclass.from_text(rdclass)
|
||
|
|
self.zone_rdclass = rdclass
|
||
|
|
self.find_rrset(self.question, self.origin, rdclass, dns.rdatatype.SOA,
|
||
|
|
create=True, force_unique=True)
|
||
|
|
if keyring is not None:
|
||
|
|
self.use_tsig(keyring, keyname, algorithm=keyalgorithm)
|
||
|
|
|
||
|
|
def _add_rr(self, name, ttl, rd, deleting=None, section=None):
|
||
|
|
"""Add a single RR to the update section."""
|
||
|
|
|
||
|
|
if section is None:
|
||
|
|
section = self.authority
|
||
|
|
covers = rd.covers()
|
||
|
|
rrset = self.find_rrset(section, name, self.zone_rdclass, rd.rdtype,
|
||
|
|
covers, deleting, True, True)
|
||
|
|
rrset.add(rd, ttl)
|
||
|
|
|
||
|
|
def _add(self, replace, section, name, *args):
|
||
|
|
"""Add records. The first argument is the replace mode. If
|
||
|
|
false, RRs are added to an existing RRset; if true, the RRset
|
||
|
|
is replaced with the specified contents. The second
|
||
|
|
argument is the section to add to. The third argument
|
||
|
|
is always a name. The other arguments can be:
|
||
|
|
|
||
|
|
- rdataset...
|
||
|
|
|
||
|
|
- ttl, rdata...
|
||
|
|
|
||
|
|
- ttl, rdtype, string..."""
|
||
|
|
|
||
|
|
if isinstance(name, string_types):
|
||
|
|
name = dns.name.from_text(name, None)
|
||
|
|
if isinstance(args[0], dns.rdataset.Rdataset):
|
||
|
|
for rds in args:
|
||
|
|
if replace:
|
||
|
|
self.delete(name, rds.rdtype)
|
||
|
|
for rd in rds:
|
||
|
|
self._add_rr(name, rds.ttl, rd, section=section)
|
||
|
|
else:
|
||
|
|
args = list(args)
|
||
|
|
ttl = int(args.pop(0))
|
||
|
|
if isinstance(args[0], dns.rdata.Rdata):
|
||
|
|
if replace:
|
||
|
|
self.delete(name, args[0].rdtype)
|
||
|
|
for rd in args:
|
||
|
|
self._add_rr(name, ttl, rd, section=section)
|
||
|
|
else:
|
||
|
|
rdtype = args.pop(0)
|
||
|
|
if isinstance(rdtype, string_types):
|
||
|
|
rdtype = dns.rdatatype.from_text(rdtype)
|
||
|
|
if replace:
|
||
|
|
self.delete(name, rdtype)
|
||
|
|
for s in args:
|
||
|
|
rd = dns.rdata.from_text(self.zone_rdclass, rdtype, s,
|
||
|
|
self.origin)
|
||
|
|
self._add_rr(name, ttl, rd, section=section)
|
||
|
|
|
||
|
|
def add(self, name, *args):
|
||
|
|
"""Add records. The first argument is always a name. The other
|
||
|
|
arguments can be:
|
||
|
|
|
||
|
|
- rdataset...
|
||
|
|
|
||
|
|
- ttl, rdata...
|
||
|
|
|
||
|
|
- ttl, rdtype, string..."""
|
||
|
|
self._add(False, self.authority, name, *args)
|
||
|
|
|
||
|
|
def delete(self, name, *args):
|
||
|
|
"""Delete records. The first argument is always a name. The other
|
||
|
|
arguments can be:
|
||
|
|
|
||
|
|
- I{nothing}
|
||
|
|
|
||
|
|
- rdataset...
|
||
|
|
|
||
|
|
- rdata...
|
||
|
|
|
||
|
|
- rdtype, [string...]"""
|
||
|
|
|
||
|
|
if isinstance(name, string_types):
|
||
|
|
name = dns.name.from_text(name, None)
|
||
|
|
if len(args) == 0:
|
||
|
|
self.find_rrset(self.authority, name, dns.rdataclass.ANY,
|
||
|
|
dns.rdatatype.ANY, dns.rdatatype.NONE,
|
||
|
|
dns.rdatatype.ANY, True, True)
|
||
|
|
elif isinstance(args[0], dns.rdataset.Rdataset):
|
||
|
|
for rds in args:
|
||
|
|
for rd in rds:
|
||
|
|
self._add_rr(name, 0, rd, dns.rdataclass.NONE)
|
||
|
|
else:
|
||
|
|
args = list(args)
|
||
|
|
if isinstance(args[0], dns.rdata.Rdata):
|
||
|
|
for rd in args:
|
||
|
|
self._add_rr(name, 0, rd, dns.rdataclass.NONE)
|
||
|
|
else:
|
||
|
|
rdtype = args.pop(0)
|
||
|
|
if isinstance(rdtype, string_types):
|
||
|
|
rdtype = dns.rdatatype.from_text(rdtype)
|
||
|
|
if len(args) == 0:
|
||
|
|
self.find_rrset(self.authority, name,
|
||
|
|
self.zone_rdclass, rdtype,
|
||
|
|
dns.rdatatype.NONE,
|
||
|
|
dns.rdataclass.ANY,
|
||
|
|
True, True)
|
||
|
|
else:
|
||
|
|
for s in args:
|
||
|
|
rd = dns.rdata.from_text(self.zone_rdclass, rdtype, s,
|
||
|
|
self.origin)
|
||
|
|
self._add_rr(name, 0, rd, dns.rdataclass.NONE)
|
||
|
|
|
||
|
|
def replace(self, name, *args):
|
||
|
|
"""Replace records. The first argument is always a name. The other
|
||
|
|
arguments can be:
|
||
|
|
|
||
|
|
- rdataset...
|
||
|
|
|
||
|
|
- ttl, rdata...
|
||
|
|
|
||
|
|
- ttl, rdtype, string...
|
||
|
|
|
||
|
|
Note that if you want to replace the entire node, you should do
|
||
|
|
a delete of the name followed by one or more calls to add."""
|
||
|
|
|
||
|
|
self._add(True, self.authority, name, *args)
|
||
|
|
|
||
|
|
def present(self, name, *args):
|
||
|
|
"""Require that an owner name (and optionally an rdata type,
|
||
|
|
or specific rdataset) exists as a prerequisite to the
|
||
|
|
execution of the update. The first argument is always a name.
|
||
|
|
The other arguments can be:
|
||
|
|
|
||
|
|
- rdataset...
|
||
|
|
|
||
|
|
- rdata...
|
||
|
|
|
||
|
|
- rdtype, string..."""
|
||
|
|
|
||
|
|
if isinstance(name, string_types):
|
||
|
|
name = dns.name.from_text(name, None)
|
||
|
|
if len(args) == 0:
|
||
|
|
self.find_rrset(self.answer, name,
|
||
|
|
dns.rdataclass.ANY, dns.rdatatype.ANY,
|
||
|
|
dns.rdatatype.NONE, None,
|
||
|
|
True, True)
|
||
|
|
elif isinstance(args[0], dns.rdataset.Rdataset) or \
|
||
|
|
isinstance(args[0], dns.rdata.Rdata) or \
|
||
|
|
len(args) > 1:
|
||
|
|
if not isinstance(args[0], dns.rdataset.Rdataset):
|
||
|
|
# Add a 0 TTL
|
||
|
|
args = list(args)
|
||
|
|
args.insert(0, 0)
|
||
|
|
self._add(False, self.answer, name, *args)
|
||
|
|
else:
|
||
|
|
rdtype = args[0]
|
||
|
|
if isinstance(rdtype, string_types):
|
||
|
|
rdtype = dns.rdatatype.from_text(rdtype)
|
||
|
|
self.find_rrset(self.answer, name,
|
||
|
|
dns.rdataclass.ANY, rdtype,
|
||
|
|
dns.rdatatype.NONE, None,
|
||
|
|
True, True)
|
||
|
|
|
||
|
|
def absent(self, name, rdtype=None):
|
||
|
|
"""Require that an owner name (and optionally an rdata type) does
|
||
|
|
not exist as a prerequisite to the execution of the update."""
|
||
|
|
|
||
|
|
if isinstance(name, string_types):
|
||
|
|
name = dns.name.from_text(name, None)
|
||
|
|
if rdtype is None:
|
||
|
|
self.find_rrset(self.answer, name,
|
||
|
|
dns.rdataclass.NONE, dns.rdatatype.ANY,
|
||
|
|
dns.rdatatype.NONE, None,
|
||
|
|
True, True)
|
||
|
|
else:
|
||
|
|
if isinstance(rdtype, string_types):
|
||
|
|
rdtype = dns.rdatatype.from_text(rdtype)
|
||
|
|
self.find_rrset(self.answer, name,
|
||
|
|
dns.rdataclass.NONE, rdtype,
|
||
|
|
dns.rdatatype.NONE, None,
|
||
|
|
True, True)
|
||
|
|
|
||
|
|
def to_wire(self, origin=None, max_size=65535):
|
||
|
|
"""Return a string containing the update in DNS compressed wire
|
||
|
|
format.
|
||
|
|
@rtype: string"""
|
||
|
|
if origin is None:
|
||
|
|
origin = self.origin
|
||
|
|
return super(Update, self).to_wire(origin, max_size)
|