def test_non_srv_answer(self):
"""
test the behaviour when the dns server gives us a spurious non-SRV response
"""
service_name = b"test_service.example.com"
lookup_deferred = Deferred()
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = lookup_deferred
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
resolve_d = resolver.resolve_service(service_name)
self.assertNoResult(resolve_d)
lookup_deferred.callback(
(
[
dns.RRHeader(type=dns.A, payload=dns.Record_A()),
dns.RRHeader(type=dns.SRV, payload=dns.Record_SRV(target=b"host")),
],
None,
None,
)
)
servers = self.successResultOf(resolve_d)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
self.assertEquals(servers[0].host, b"host")
def test_disabled_service(self):
"""
test the behaviour when there is a single record which is ".".
"""
service_name = b"test_service.example.com"
lookup_deferred = Deferred()
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = lookup_deferred
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
# Old versions of Twisted don't have an ensureDeferred in failureResultOf.
resolve_d = defer.ensureDeferred(resolver.resolve_service(service_name))
# returning a single "." should make the lookup fail with a ConenctError
lookup_deferred.callback(
(
[dns.RRHeader(type=dns.SRV, payload=dns.Record_SRV(target=b"."))],
None,
None,
)
)
self.failureResultOf(resolve_d, ConnectError)
def test_from_cache(self):
clock = MockClock()
dns_client_mock = Mock(spec_set=["lookupService"])
dns_client_mock.lookupService = Mock(spec_set=[])
service_name = b"test_service.example.com"
entry = Mock(spec_set=["expires", "priority", "weight"])
entry.expires = 999999999
entry.priority = 0
entry.weight = 0
cache = {service_name: [entry]}
resolver = SrvResolver(dns_client=dns_client_mock,
cache=cache,
get_time=clock.time)
servers = yield defer.ensureDeferred(
resolver.resolve_service(service_name))
self.assertFalse(dns_client_mock.lookupService.called)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
def test_disabled_service(self):
"""
test the behaviour when there is a single record which is ".".
"""
service_name = b"test_service.example.com"
lookup_deferred = Deferred()
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = lookup_deferred
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
resolve_d = resolver.resolve_service(service_name)
self.assertNoResult(resolve_d)
# returning a single "." should make the lookup fail with a ConenctError
lookup_deferred.callback(
(
[dns.RRHeader(type=dns.SRV, payload=dns.Record_SRV(target=b"."))],
None,
None,
)
)
self.failureResultOf(resolve_d, ConnectError)
def test_non_srv_answer(self):
"""
test the behaviour when the dns server gives us a spurious non-SRV response
"""
service_name = b"test_service.example.com"
lookup_deferred = Deferred()
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = lookup_deferred
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
resolve_d = resolver.resolve_service(service_name)
self.assertNoResult(resolve_d)
lookup_deferred.callback((
[
dns.RRHeader(type=dns.A, payload=dns.Record_A()),
dns.RRHeader(type=dns.SRV,
payload=dns.Record_SRV(target=b"host")),
],
None,
None,
))
servers = self.successResultOf(resolve_d)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
self.assertEquals(servers[0].host, b"host")
def test_empty_cache(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
service_name = b"test_service.example.com"
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
with self.assertRaises(error.DNSServerError):
yield defer.ensureDeferred(resolver.resolve_service(service_name))
def test_empty_cache(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
service_name = b"test_service.example.com"
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
with self.assertRaises(error.DNSServerError):
yield resolver.resolve_service(service_name)
def test_name_error(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(error.DNSNameError())
service_name = b"test_service.example.com"
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
servers = yield defer.ensureDeferred(resolver.resolve_service(service_name))
self.assertEqual(len(servers), 0)
self.assertEqual(len(cache), 0)
def test_name_error(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(error.DNSNameError())
service_name = b"test_service.example.com"
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
servers = yield resolver.resolve_service(service_name)
self.assertEquals(len(servers), 0)
self.assertEquals(len(cache), 0)
def __init__(
self,
reactor,
tls_client_options_factory,
_srv_resolver=None,
_well_known_cache=None,
):
self._reactor = reactor
self._clock = Clock(reactor)
self._tls_client_options_factory = tls_client_options_factory
if _srv_resolver is None:
_srv_resolver = SrvResolver()
self._srv_resolver = _srv_resolver
self._pool = HTTPConnectionPool(reactor)
self._pool.retryAutomatically = False
self._pool.maxPersistentPerHost = 5
self._pool.cachedConnectionTimeout = 2 * 60
self._well_known_resolver = WellKnownResolver(
self._reactor,
agent=Agent(
self._reactor,
pool=self._pool,
contextFactory=tls_client_options_factory,
),
well_known_cache=_well_known_cache,
)
def __init__(
self,
reactor,
tls_client_options_factory,
_well_known_tls_policy=None,
_srv_resolver=None,
_well_known_cache=well_known_cache,
):
self._reactor = reactor
self._clock = Clock(reactor)
self._tls_client_options_factory = tls_client_options_factory
if _srv_resolver is None:
_srv_resolver = SrvResolver()
self._srv_resolver = _srv_resolver
self._pool = HTTPConnectionPool(reactor)
self._pool.retryAutomatically = False
self._pool.maxPersistentPerHost = 5
self._pool.cachedConnectionTimeout = 2 * 60
agent_args = {}
if _well_known_tls_policy is not None:
# the param is called 'contextFactory', but actually passing a
# contextfactory is deprecated, and it expects an IPolicyForHTTPS.
agent_args['contextFactory'] = _well_known_tls_policy
_well_known_agent = RedirectAgent(
Agent(self._reactor, pool=self._pool, **agent_args), )
self._well_known_agent = _well_known_agent
# our cache of .well-known lookup results, mapping from server name
# to delegated name. The values can be:
# `bytes`: a valid server-name
# `None`: there is no (valid) .well-known here
self._well_known_cache = _well_known_cache
def __init__(self, reactor, tls_client_options_factory, srv_resolver):
self._reactor = reactor
self._tls_client_options_factory = tls_client_options_factory
if srv_resolver is None:
srv_resolver = SrvResolver()
self._srv_resolver = srv_resolver
def test_from_cache_expired_and_dns_fail(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
service_name = b"test_service.example.com"
entry = Mock(spec_set=["expires"])
entry.expires = 0
cache = {service_name: [entry]}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
servers = yield resolver.resolve_service(service_name)
dns_client_mock.lookupService.assert_called_once_with(service_name)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
def test_from_cache_expired_and_dns_fail(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
service_name = b"test_service.example.com"
entry = Mock(spec_set=["expires"])
entry.expires = 0
cache = {service_name: [entry]}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
servers = yield resolver.resolve_service(service_name)
dns_client_mock.lookupService.assert_called_once_with(service_name)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
def test_from_cache(self):
clock = MockClock()
dns_client_mock = Mock(spec_set=['lookupService'])
dns_client_mock.lookupService = Mock(spec_set=[])
service_name = b"test_service.example.com"
entry = Mock(spec_set=["expires"])
entry.expires = 999999999
cache = {service_name: [entry]}
resolver = SrvResolver(dns_client=dns_client_mock,
cache=cache,
get_time=clock.time)
servers = yield resolver.resolve_service(service_name)
self.assertFalse(dns_client_mock.lookupService.called)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
def test_from_cache(self):
clock = MockClock()
dns_client_mock = Mock(spec_set=['lookupService'])
dns_client_mock.lookupService = Mock(spec_set=[])
service_name = b"test_service.example.com"
entry = Mock(spec_set=["expires"])
entry.expires = 999999999
cache = {service_name: [entry]}
resolver = SrvResolver(
dns_client=dns_client_mock, cache=cache, get_time=clock.time
)
servers = yield resolver.resolve_service(service_name)
self.assertFalse(dns_client_mock.lookupService.called)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
def __init__(
self,
reactor: IReactorCore,
tls_client_options_factory: Optional[FederationPolicyForHTTPS],
srv_resolver: Optional[SrvResolver],
):
self._reactor = reactor
self._tls_client_options_factory = tls_client_options_factory
if srv_resolver is None:
srv_resolver = SrvResolver()
self._srv_resolver = srv_resolver
def test_resolve(self):
dns_client_mock = Mock()
service_name = b"test_service.example.com"
host_name = b"example.com"
answer_srv = dns.RRHeader(type=dns.SRV,
payload=dns.Record_SRV(target=host_name))
result_deferred = Deferred()
dns_client_mock.lookupService.return_value = result_deferred
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
@defer.inlineCallbacks
def do_lookup():
with LoggingContext("one") as ctx:
resolve_d = resolver.resolve_service(service_name)
self.assertNoResult(resolve_d)
# should have reset to the sentinel context
self.assertIs(LoggingContext.current_context(),
LoggingContext.sentinel)
result = yield resolve_d
# should have restored our context
self.assertIs(LoggingContext.current_context(), ctx)
defer.returnValue(result)
test_d = do_lookup()
self.assertNoResult(test_d)
dns_client_mock.lookupService.assert_called_once_with(service_name)
result_deferred.callback(([answer_srv], None, None))
servers = self.successResultOf(test_d)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
self.assertEquals(servers[0].host, host_name)
def __init__(
self,
reactor: IReactorCore,
proxy_reactor: IReactorCore,
tls_client_options_factory: Optional[FederationPolicyForHTTPS],
srv_resolver: Optional[SrvResolver],
https_proxy: Optional[bytes] = None,
):
self._reactor = reactor
self._tls_client_options_factory = tls_client_options_factory
if srv_resolver is None:
srv_resolver = SrvResolver()
self._srv_resolver = srv_resolver
self.https_proxy_creds, https_proxy = parse_username_password(https_proxy)
self.https_proxy_endpoint = proxyagent.http_proxy_endpoint(
https_proxy, proxy_reactor
)
