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Together, these define where zone transfers will be attempted from. @param domain: A C{bytes} 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(FileAuthority): """ 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 L{None} to use the global reactor. """ transferring = False soa = records = None _port = 53 _reactor = None def __init__(self, primaryIP, domain): """ @param domain: The domain for which this will be the secondary authority. @type domain: L{bytes} """ # Yep. Skip over FileAuthority.__init__. This is a hack until we have # a good composition-based API for the complicated DNS record lookup # logic we want to share. 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{bytes} 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{bytes} 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._lookup(self, name, cls, type, timeout) 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)