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# -*- test-case-name: twisted.names.test.test_names -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
__all__ = ['SecondaryAuthority', 'SecondaryAuthorityService']
from twisted.internet import task, defer
from twisted.names import dns
from twisted.names import common
from twisted.names import client
from twisted.names import resolve
from twisted.names.authority import FileAuthority
from twisted.python import log, failure
from twisted.application import service
class SecondaryAuthorityService(service.Service):
calls = None
_port = 53
def __init__(self, primary, domains):
"""
@param primary: The IP address of the server from which to perform
zone transfers.
@param domains: A sequence of domain names for which to perform
zone transfers.
"""
self.primary = primary
self.domains = [SecondaryAuthority(primary, d) for d in domains]
@classmethod
def fromServerAddressAndDomains(cls, serverAddress, domains):
"""
Construct a new L{SecondaryAuthorityService} from a tuple giving a
server address and a C{str} giving the name of a domain for which this
is an authority.
@param serverAddress: A two-tuple, the first element of which is a
C{str} giving an IP address and the second element of which is a
C{int} giving a port number. Together, these define where zone
transfers will be attempted from.
@param domain: A C{str} giving the domain to transfer.
@return: A new instance of L{SecondaryAuthorityService}.
"""
service = cls(None, [])
service.primary = serverAddress[0]
service._port = serverAddress[1]
service.domains = [
SecondaryAuthority.fromServerAddressAndDomain(serverAddress, d)
for d in domains]
return service
def getAuthority(self):
return resolve.ResolverChain(self.domains)
def startService(self):
service.Service.startService(self)
self.calls = [task.LoopingCall(d.transfer) for d in self.domains]
i = 0
from twisted.internet import reactor
for c in self.calls:
# XXX Add errbacks, respect proper timeouts
reactor.callLater(i, c.start, 60 * 60)
i += 1
def stopService(self):
service.Service.stopService(self)
for c in self.calls:
c.stop()
class SecondaryAuthority(common.ResolverBase):
"""
An Authority that keeps itself updated by performing zone transfers.
@ivar primary: The IP address of the server from which zone transfers will
be attempted.
@type primary: C{str}
@ivar _port: The port number of the server from which zone transfers will be
attempted.
@type: C{int}
@ivar _reactor: The reactor to use to perform the zone transfers, or C{None}
to use the global reactor.
"""
transferring = False
soa = records = None
_port = 53
_reactor = None
def __init__(self, primaryIP, domain):
common.ResolverBase.__init__(self)
self.primary = primaryIP
self.domain = domain
@classmethod
def fromServerAddressAndDomain(cls, serverAddress, domain):
"""
Construct a new L{SecondaryAuthority} from a tuple giving a server
address and a C{str} giving the name of a domain for which this is an
authority.
@param serverAddress: A two-tuple, the first element of which is a
C{str} giving an IP address and the second element of which is a
C{int} giving a port number. Together, these define where zone
transfers will be attempted from.
@param domain: A C{str} giving the domain to transfer.
@return: A new instance of L{SecondaryAuthority}.
"""
secondary = cls(None, None)
secondary.primary = serverAddress[0]
secondary._port = serverAddress[1]
secondary.domain = domain
return secondary
def transfer(self):
if self.transferring:
return
self.transfering = True
reactor = self._reactor
if reactor is None:
from twisted.internet import reactor
resolver = client.Resolver(
servers=[(self.primary, self._port)], reactor=reactor)
return resolver.lookupZone(self.domain
).addCallback(self._cbZone
).addErrback(self._ebZone
)
def _lookup(self, name, cls, type, timeout=None):
if not self.soa or not self.records:
return defer.fail(failure.Failure(dns.DomainError(name)))
return FileAuthority.__dict__['_lookup'](self, name, cls, type, timeout)
#shouldn't we just subclass? :P
lookupZone = FileAuthority.__dict__['lookupZone']
def _cbZone(self, zone):
ans, _, _ = zone
self.records = r = {}
for rec in ans:
if not self.soa and rec.type == dns.SOA:
self.soa = (str(rec.name).lower(), rec.payload)
else:
r.setdefault(str(rec.name).lower(), []).append(rec.payload)
def _ebZone(self, failure):
log.msg("Updating %s from %s failed during zone transfer" % (self.domain, self.primary))
log.err(failure)
def update(self):
self.transfer().addCallbacks(self._cbTransferred, self._ebTransferred)
def _cbTransferred(self, result):
self.transferring = False
def _ebTransferred(self, failure):
self.transferred = False
log.msg("Transferring %s from %s failed after zone transfer" % (self.domain, self.primary))
log.err(failure)
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