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duality-group
duality-group / dnspython python
Repository URL to install this package:
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Version:
2.2.1 ▾
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2003-2017 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.
from io import StringIO
import selectors
import sys
import socket
import time
import unittest
import pytest
import dns.e164
import dns.message
import dns.name
import dns.rdataclass
import dns.rdatatype
import dns.resolver
import dns.tsig
import dns.tsigkeyring
# Some tests require the internet to be available to run, so let's
# skip those if it's not there.
_network_available = True
try:
socket.gethostbyname('dnspython.org')
except socket.gaierror:
_network_available = False
# Some tests use a "nano nameserver" for testing. It requires trio
# and threading, so try to import it and if it doesn't work, skip
# those tests.
try:
from .nanonameserver import Server
_nanonameserver_available = True
except ImportError:
_nanonameserver_available = False
class Server(object):
pass
# Look for systemd-resolved, as it does dangling CNAME responses incorrectly.
#
# Currently we simply check if the nameserver is 127.0.0.53.
_systemd_resolved_present = False
try:
_resolver = dns.resolver.Resolver()
if _resolver.nameservers == ['127.0.0.53']:
_systemd_resolved_present = True
except Exception:
pass
resolv_conf = u"""
/t/t
# comment 1
; comment 2
domain foo
nameserver 10.0.0.1
nameserver 10.0.0.2
"""
resolv_conf_options1 = """
nameserver 10.0.0.1
nameserver 10.0.0.2
search search1 search2
options rotate timeout:1 edns0 ndots:2
"""
bad_timeout_1 = """
nameserver 10.0.0.1
nameserver 10.0.0.2
options rotate timeout
"""
bad_timeout_2 = """
nameserver 10.0.0.1
nameserver 10.0.0.2
options rotate timeout:bogus
"""
bad_ndots_1 = """
nameserver 10.0.0.1
nameserver 10.0.0.2
options rotate ndots
"""
bad_ndots_2 = """
nameserver 10.0.0.1
nameserver 10.0.0.2
options rotate ndots:bogus
"""
no_nameservers = """
options rotate
"""
unknown_and_bad_directives = """
nameserver 10.0.0.1
foo bar
bad
"""
unknown_option = """
nameserver 10.0.0.1
option foobar
"""
message_text = """id 1234
opcode QUERY
rcode NOERROR
flags QR AA RD
;QUESTION
example. IN A
;ANSWER
example. 1 IN A 10.0.0.1
;AUTHORITY
;ADDITIONAL
"""
message_text_mx = """id 1234
opcode QUERY
rcode NOERROR
flags QR AA RD
;QUESTION
example. IN MX
;ANSWER
example. 1 IN A 10.0.0.1
;AUTHORITY
;ADDITIONAL
"""
dangling_cname_0_message_text = """id 10000
opcode QUERY
rcode NOERROR
flags QR AA RD RA
;QUESTION
91.11.17.172.in-addr.arpa.none. IN PTR
;ANSWER
;AUTHORITY
;ADDITIONAL
"""
dangling_cname_1_message_text = """id 10001
opcode QUERY
rcode NOERROR
flags QR AA RD RA
;QUESTION
91.11.17.172.in-addr.arpa. IN PTR
;ANSWER
11.17.172.in-addr.arpa. 86400 IN DNAME 11.8-22.17.172.in-addr.arpa.
91.11.17.172.in-addr.arpa. 86400 IN CNAME 91.11.8-22.17.172.in-addr.arpa.
;AUTHORITY
;ADDITIONAL
"""
dangling_cname_2_message_text = """id 10002
opcode QUERY
rcode NOERROR
flags QR AA RD RA
;QUESTION
91.11.17.172.in-addr.arpa.example. IN PTR
;ANSWER
91.11.17.172.in-addr.arpa.example. 86400 IN CNAME 91.11.17.172.in-addr.arpa.base.
91.11.17.172.in-addr.arpa.base. 86400 IN CNAME 91.11.17.172.clients.example.
91.11.17.172.clients.example. 86400 IN CNAME 91-11-17-172.dynamic.example.
;AUTHORITY
;ADDITIONAL
"""
class FakeAnswer(object):
def __init__(self, expiration):
self.expiration = expiration
class FakeTime:
# Mock the clock!
def __init__(self, now=None, want_fake=True):
if now is None:
now = time.time()
self.now = now
self.saved_time = time.time
self.want_fake = want_fake
def __enter__(self):
if self.want_fake:
time.time = self.time
return self
def __exit__(self, exc_type, exc_value, traceback):
if self.want_fake:
time.time = self.saved_time
return False
def time(self):
if self.want_fake:
return self.now
else:
return time.time()
def sleep(self, offset):
if self.want_fake:
self.now += offset
else:
time.sleep(offset)
class BaseResolverTests(unittest.TestCase):
def testRead(self):
f = StringIO(resolv_conf)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
self.assertEqual(r.nameservers, ['10.0.0.1', '10.0.0.2'])
self.assertEqual(r.domain, dns.name.from_text('foo'))
def testReadOptions(self):
f = StringIO(resolv_conf_options1)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
self.assertEqual(r.nameservers, ['10.0.0.1', '10.0.0.2'])
self.assertTrue(r.rotate)
self.assertEqual(r.timeout, 1)
self.assertEqual(r.ndots, 2)
self.assertEqual(r.edns, 0)
self.assertEqual(r.payload, dns.message.DEFAULT_EDNS_PAYLOAD)
def testReadOptionsBadTimeouts(self):
f = StringIO(bad_timeout_1)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
# timeout should still be default
self.assertEqual(r.timeout, 2.0)
f = StringIO(bad_timeout_2)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
# timeout should still be default
self.assertEqual(r.timeout, 2.0)
def testReadOptionsBadNdots(self):
f = StringIO(bad_ndots_1)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
# ndots should still be default
self.assertEqual(r.ndots, None)
f = StringIO(bad_ndots_2)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
# ndots should still be default
self.assertEqual(r.ndots, None)
def testReadNoNameservers(self):
f = StringIO(no_nameservers)
r = dns.resolver.Resolver(configure=False)
with self.assertRaises(dns.resolver.NoResolverConfiguration):
r.read_resolv_conf(f)
def testReadUnknownDirective(self):
# The real test here is ignoring the unknown directive and the bad
# directive.
f = StringIO(unknown_and_bad_directives)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
self.assertEqual(r.nameservers, ['10.0.0.1'])
def testReadUnknownOption(self):
# The real test here is ignoring the unknown option
f = StringIO(unknown_option)
r = dns.resolver.Resolver(configure=False)
r.read_resolv_conf(f)
self.assertEqual(r.nameservers, ['10.0.0.1'])
def testCacheExpiration(self):
with FakeTime() as fake_time:
message = dns.message.from_text(message_text)
name = dns.name.from_text('example.')
answer = dns.resolver.Answer(name, dns.rdatatype.A,
dns.rdataclass.IN, message)
cache = dns.resolver.Cache()
cache.put((name, dns.rdatatype.A, dns.rdataclass.IN), answer)
fake_time.sleep(2)
self.assertTrue(cache.get((name, dns.rdatatype.A,
dns.rdataclass.IN))
is None)
def testCacheCleaning(self):
with FakeTime() as fake_time:
message = dns.message.from_text(message_text)
name = dns.name.from_text('example.')
answer = dns.resolver.Answer(name, dns.rdatatype.A,
dns.rdataclass.IN, message)
cache = dns.resolver.Cache(cleaning_interval=1.0)
cache.put((name, dns.rdatatype.A, dns.rdataclass.IN), answer)
fake_time.sleep(2)
cache._maybe_clean()
self.assertTrue(cache.data.get((name, dns.rdatatype.A,
dns.rdataclass.IN))
is None)
def testCacheNonCleaning(self):
with FakeTime() as fake_time:
message = dns.message.from_text(message_text)
name = dns.name.from_text('example.')
answer = dns.resolver.Answer(name, dns.rdatatype.A,
dns.rdataclass.IN, message)
# override TTL as we're testing non-cleaning
answer.expiration = fake_time.time() + 100
cache = dns.resolver.Cache(cleaning_interval=1.0)
cache.put((name, dns.rdatatype.A, dns.rdataclass.IN), answer)
fake_time.sleep(1.1)
self.assertEqual(cache.get((name, dns.rdatatype.A,
dns.rdataclass.IN)), answer)
def testIndexErrorOnEmptyRRsetAccess(self):
def bad():
message = dns.message.from_text(message_text_mx)
name = dns.name.from_text('example.')
answer = dns.resolver.Answer(name, dns.rdatatype.MX,
dns.rdataclass.IN, message)
return answer[0]
self.assertRaises(IndexError, bad)
def testIndexErrorOnEmptyRRsetDelete(self):
def bad():
message = dns.message.from_text(message_text_mx)
name = dns.name.from_text('example.')
answer = dns.resolver.Answer(name, dns.rdatatype.MX,
dns.rdataclass.IN, message)
del answer[0]
self.assertRaises(IndexError, bad)
def testRRsetDelete(self):
message = dns.message.from_text(message_text)
name = dns.name.from_text('example.')
answer = dns.resolver.Answer(name, dns.rdatatype.A,
dns.rdataclass.IN, message)
del answer[0]
self.assertEqual(len(answer), 0)
def testLRUReplace(self):
cache = dns.resolver.LRUCache(4)
for i in range(0, 5):
name = dns.name.from_text('example%d.' % i)
answer = FakeAnswer(time.time() + 1)
cache.put((name, dns.rdatatype.A, dns.rdataclass.IN), answer)
for i in range(0, 5):
name = dns.name.from_text('example%d.' % i)
if i == 0:
self.assertTrue(cache.get((name, dns.rdatatype.A,
dns.rdataclass.IN))
is None)
else:
self.assertTrue(not cache.get((name, dns.rdatatype.A,
dns.rdataclass.IN))
is None)
def testLRUDoesLRU(self):
cache = dns.resolver.LRUCache(4)
for i in range(0, 4):
name = dns.name.from_text('example%d.' % i)
answer = FakeAnswer(time.time() + 1)
cache.put((name, dns.rdatatype.A, dns.rdataclass.IN), answer)
name = dns.name.from_text('example0.')
cache.get((name, dns.rdatatype.A, dns.rdataclass.IN))
# The LRU is now example1.
name = dns.name.from_text('example4.')
answer = FakeAnswer(time.time() + 1)
cache.put((name, dns.rdatatype.A, dns.rdataclass.IN), answer)
for i in range(0, 5):
name = dns.name.from_text('example%d.' % i)
if i == 1:
self.assertTrue(cache.get((name, dns.rdatatype.A,
dns.rdataclass.IN))
is None)
else:
self.assertTrue(not cache.get((name, dns.rdatatype.A,
dns.rdataclass.IN))
is None)
def testLRUExpiration(self):
with FakeTime() as fake_time:
cache = dns.resolver.LRUCache(4)
for i in range(0, 4):
name = dns.name.from_text('example%d.' % i)
answer = FakeAnswer(time.time() + 1)
cache.put((name, dns.rdatatype.A, dns.rdataclass.IN), answer)
fake_time.sleep(2)
for i in range(0, 4):
name = dns.name.from_text('example%d.' % i)
self.assertTrue(cache.get((name, dns.rdatatype.A,
dns.rdataclass.IN))
is None)
def test_cache_flush(self):
name1 = dns.name.from_text('name1')
name2 = dns.name.from_text('name2')
name3 = dns.name.from_text('name3')
basic_cache = dns.resolver.Cache()
lru_cache = dns.resolver.LRUCache(100)
for cache in [basic_cache, lru_cache]:
answer1 = FakeAnswer(time.time() + 10)
answer2 = FakeAnswer(time.time() + 10)
cache.put((name1, dns.rdatatype.A, dns.rdataclass.IN), answer1)
cache.put((name2, dns.rdatatype.A, dns.rdataclass.IN), answer2)
canswer = cache.get((name1, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is answer1)
canswer = cache.get((name2, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is answer2)
# explicit flush of nonexistent key, just to exercise the branch
cache.flush((name3, dns.rdatatype.A, dns.rdataclass.IN))
canswer = cache.get((name1, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is answer1)
canswer = cache.get((name2, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is answer2)
# explicit flush
cache.flush((name1, dns.rdatatype.A, dns.rdataclass.IN))
canswer = cache.get((name1, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is None)
canswer = cache.get((name2, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is answer2)
# flush all
cache.flush()
canswer = cache.get((name1, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is None)
canswer = cache.get((name2, dns.rdatatype.A, dns.rdataclass.IN))
self.assertTrue(canswer is None)
def test_LRUCache_set_max_size(self):
cache = dns.resolver.LRUCache(4)
self.assertEqual(cache.max_size, 4)
cache.set_max_size(0)
self.assertEqual(cache.max_size, 1)
def test_LRUCache_overwrite(self):
def on_lru_list(cache, key, value):
cnode = cache.sentinel.next
while cnode != cache.sentinel:
if cnode.key == key and cnode.value is value:
return True
cnode = cnode.next
return False
cache = dns.resolver.LRUCache(4)
answer1 = FakeAnswer(time.time() + 10)
answer2 = FakeAnswer(time.time() + 10)
key = (dns.name.from_text('key.'), dns.rdatatype.A, dns.rdataclass.IN)
cache.put(key, answer1)
canswer = cache.get(key)
self.assertTrue(canswer is answer1)
self.assertTrue(on_lru_list(cache, key, answer1))
cache.put(key, answer2)
canswer = cache.get(key)
self.assertTrue(canswer is answer2)
self.assertFalse(on_lru_list(cache, key, answer1))
self.assertTrue(on_lru_list(cache, key, answer2))
def test_cache_stats(self):
caches = [dns.resolver.Cache(), dns.resolver.LRUCache(4)]
key1 = (dns.name.from_text('key1.'), dns.rdatatype.A, dns.rdataclass.IN)
key2 = (dns.name.from_text('key2.'), dns.rdatatype.A, dns.rdataclass.IN)
for cache in caches:
answer1 = FakeAnswer(time.time() + 10)
answer2 = FakeAnswer(10) # expired!
a = cache.get(key1)
self.assertIsNone(a)
self.assertEqual(cache.hits(), 0)
self.assertEqual(cache.misses(), 1)
if isinstance(cache, dns.resolver.LRUCache):
self.assertEqual(cache.get_hits_for_key(key1), 0)
cache.put(key1, answer1)
a = cache.get(key1)
self.assertIs(a, answer1)
self.assertEqual(cache.hits(), 1)
self.assertEqual(cache.misses(), 1)
if isinstance(cache, dns.resolver.LRUCache):
self.assertEqual(cache.get_hits_for_key(key1), 1)
cache.put(key2, answer2)
a = cache.get(key2)
self.assertIsNone(a)
self.assertEqual(cache.hits(), 1)
self.assertEqual(cache.misses(), 2)
if isinstance(cache, dns.resolver.LRUCache):
self.assertEqual(cache.get_hits_for_key(key2), 0)
stats = cache.get_statistics_snapshot()
self.assertEqual(stats.hits, 1)
self.assertEqual(stats.misses, 2)
cache.reset_statistics()
stats = cache.get_statistics_snapshot()
self.assertEqual(stats.hits, 0)
self.assertEqual(stats.misses, 0)
def testEmptyAnswerSection(self):
# TODO: dangling_cname_0_message_text was the only sample message
# with an empty answer section. Other than that it doesn't
# apply.
message = dns.message.from_text(dangling_cname_0_message_text)
name = dns.name.from_text('example.')
answer = dns.resolver.Answer(name, dns.rdatatype.A, dns.rdataclass.IN,
message)
def test_python_internal_truth(answer):
if answer:
return True
else:
return False
self.assertFalse(test_python_internal_truth(answer))
for a in answer:
pass
def testSearchListsRelative(self):
res = dns.resolver.Resolver(configure=False)
res.domain = dns.name.from_text('example')
res.search = [dns.name.from_text(x) for x in
['dnspython.org', 'dnspython.net']]
qname = dns.name.from_text('www', None)
qnames = res._get_qnames_to_try(qname, True)
self.assertEqual(qnames,
[dns.name.from_text(x) for x in
['www.dnspython.org', 'www.dnspython.net', 'www.']])
qnames = res._get_qnames_to_try(qname, False)
self.assertEqual(qnames,
[dns.name.from_text('www.')])
qnames = res._get_qnames_to_try(qname, None)
self.assertEqual(qnames,
[dns.name.from_text('www.')])
#
# Now change search default on resolver to True
#
res.use_search_by_default = True
qnames = res._get_qnames_to_try(qname, None)
self.assertEqual(qnames,
[dns.name.from_text(x) for x in
['www.dnspython.org', 'www.dnspython.net', 'www.']])
#
# Now test ndots
#
qname = dns.name.from_text('a.b', None)
res.ndots = 1
qnames = res._get_qnames_to_try(qname, True)
self.assertEqual(qnames,
[dns.name.from_text(x) for x in
['a.b', 'a.b.dnspython.org', 'a.b.dnspython.net']])
res.ndots = 2
qnames = res._get_qnames_to_try(qname, True)
self.assertEqual(qnames,
[dns.name.from_text(x) for x in
['a.b.dnspython.org', 'a.b.dnspython.net', 'a.b']])
qname = dns.name.from_text('a.b.c', None)
qnames = res._get_qnames_to_try(qname, True)
self.assertEqual(qnames,
[dns.name.from_text(x) for x in
['a.b.c', 'a.b.c.dnspython.org',
'a.b.c.dnspython.net']])
def testSearchListsAbsolute(self):
res = dns.resolver.Resolver(configure=False)
qname = dns.name.from_text('absolute')
qnames = res._get_qnames_to_try(qname, True)
self.assertEqual(qnames, [qname])
qnames = res._get_qnames_to_try(qname, False)
self.assertEqual(qnames, [qname])
qnames = res._get_qnames_to_try(qname, None)
self.assertEqual(qnames, [qname])
def testUseEDNS(self):
r = dns.resolver.Resolver(configure=False)
r.use_edns(None)
self.assertEqual(r.edns, -1)
r.use_edns(False)
self.assertEqual(r.edns, -1)
r.use_edns(True)
self.assertEqual(r.edns, 0)
def testSetFlags(self):
flags = dns.flags.CD | dns.flags.RD
r = dns.resolver.Resolver(configure=False)
r.set_flags(flags)
self.assertEqual(r.flags, flags)
def testUseTSIG(self):
keyring = dns.tsigkeyring.from_text(
{
'keyname.': 'NjHwPsMKjdN++dOfE5iAiQ=='
}
)
r = dns.resolver.Resolver(configure=False)
r.use_tsig(keyring)
self.assertEqual(r.keyring, keyring)
self.assertEqual(r.keyname, None)
self.assertEqual(r.keyalgorithm, dns.tsig.default_algorithm)
keyname = dns.name.from_text('keyname')
@unittest.skipIf(not _network_available, "Internet not reachable")
class LiveResolverTests(unittest.TestCase):
def testZoneForName1(self):
name = dns.name.from_text('www.dnspython.org.')
ezname = dns.name.from_text('dnspython.org.')
zname = dns.resolver.zone_for_name(name)
self.assertEqual(zname, ezname)
def testZoneForName2(self):
name = dns.name.from_text('a.b.www.dnspython.org.')
ezname = dns.name.from_text('dnspython.org.')
zname = dns.resolver.zone_for_name(name)
self.assertEqual(zname, ezname)
def testZoneForName3(self):
ezname = dns.name.from_text('dnspython.org.')
zname = dns.resolver.zone_for_name('dnspython.org.')
self.assertEqual(zname, ezname)
def testZoneForName4(self):
def bad():
name = dns.name.from_text('dnspython.org', None)
dns.resolver.zone_for_name(name)
self.assertRaises(dns.resolver.NotAbsolute, bad)
def testResolve(self):
answer = dns.resolver.resolve('dns.google.', 'A')
seen = set([rdata.address for rdata in answer])
self.assertTrue('8.8.8.8' in seen)
self.assertTrue('8.8.4.4' in seen)
def testResolveTCP(self):
answer = dns.resolver.resolve('dns.google.', 'A', tcp=True)
seen = set([rdata.address for rdata in answer])
self.assertTrue('8.8.8.8' in seen)
self.assertTrue('8.8.4.4' in seen)
def testResolveAddress(self):
answer = dns.resolver.resolve_address('8.8.8.8')
dnsgoogle = dns.name.from_text('dns.google.')
self.assertEqual(answer[0].target, dnsgoogle)
def testResolveNodataException(self):
def bad():
dns.resolver.resolve('dnspython.org.', 'SRV')
self.assertRaises(dns.resolver.NoAnswer, bad)
def testResolveNodataAnswer(self):
qname = dns.name.from_text('dnspython.org')
qclass = dns.rdataclass.from_text('IN')
qtype = dns.rdatatype.from_text('SRV')
answer = dns.resolver.resolve(qname, qtype, raise_on_no_answer=False)
self.assertRaises(KeyError,
lambda: answer.response.find_rrset(answer.response.answer,
qname, qclass, qtype))
def testResolveNXDOMAIN(self):
qname = dns.name.from_text('nxdomain.dnspython.org')
qclass = dns.rdataclass.from_text('IN')
qtype = dns.rdatatype.from_text('A')
def bad():
answer = dns.resolver.resolve(qname, qtype)
try:
dns.resolver.resolve(qname, qtype)
self.assertTrue(False) # should not happen!
except dns.resolver.NXDOMAIN as nx:
self.assertIn(qname, nx.qnames())
self.assertGreaterEqual(len(nx.responses()), 1)
def testResolveCacheHit(self):
res = dns.resolver.Resolver(configure=False)
res.nameservers = ['8.8.8.8']
res.cache = dns.resolver.Cache()
answer1 = res.resolve('dns.google.', 'A')
seen = set([rdata.address for rdata in answer1])
self.assertIn('8.8.8.8', seen)
self.assertIn('8.8.4.4', seen)
answer2 = res.resolve('dns.google.', 'A')
self.assertIs(answer2, answer1)
def testCanonicalNameNoCNAME(self):
cname = dns.name.from_text('www.google.com')
self.assertEqual(dns.resolver.canonical_name('www.google.com'), cname)
def testCanonicalNameCNAME(self):
name = dns.name.from_text('www.dnspython.org')
cname = dns.name.from_text('dmfrjf4ips8xa.cloudfront.net')
self.assertEqual(dns.resolver.canonical_name(name), cname)
@unittest.skipIf(_systemd_resolved_present, "systemd-resolved in use")
def testCanonicalNameDangling(self):
name = dns.name.from_text('dangling-cname.dnspython.org')
cname = dns.name.from_text('dangling-target.dnspython.org')
self.assertEqual(dns.resolver.canonical_name(name), cname)
def testNameserverSetting(self):
res = dns.resolver.Resolver(configure=False)
ns = ['1.2.3.4', '::1', 'https://ns.example']
res.nameservers = ns[:]
self.assertEqual(res.nameservers, ns)
for ns in ['999.999.999.999', 'ns.example.', 'bogus://ns.example']:
with self.assertRaises(ValueError):
res.nameservers = [ns]
class PollingMonkeyPatchMixin(object):
def setUp(self):
self.__native_selector_class = dns.query._selector_class
dns.query._set_selector_class(self.selector_class())
unittest.TestCase.setUp(self)
def tearDown(self):
dns.query._set_selector_class(self.__native_selector_class)
unittest.TestCase.tearDown(self)
class SelectResolverTestCase(PollingMonkeyPatchMixin, LiveResolverTests, unittest.TestCase):
def selector_class(self):
return selectors.SelectSelector
if hasattr(selectors, 'PollSelector'):
class PollResolverTestCase(PollingMonkeyPatchMixin, LiveResolverTests, unittest.TestCase):
def selector_class(self):
return selectors.PollSelector
class NXDOMAINExceptionTestCase(unittest.TestCase):
# pylint: disable=broad-except
def test_nxdomain_compatible(self):
n1 = dns.name.Name(('a', 'b', ''))
n2 = dns.name.Name(('a', 'b', 's', ''))
try:
raise dns.resolver.NXDOMAIN
except dns.exception.DNSException as e:
self.assertEqual(e.args, (e.__doc__,))
self.assertTrue(('kwargs' in dir(e)))
self.assertEqual(str(e), e.__doc__, str(e))
self.assertTrue(('qnames' not in e.kwargs))
self.assertTrue(('responses' not in e.kwargs))
try:
raise dns.resolver.NXDOMAIN("errmsg")
except dns.exception.DNSException as e:
self.assertEqual(e.args, ("errmsg",))
self.assertTrue(('kwargs' in dir(e)))
self.assertEqual(str(e), "errmsg", str(e))
self.assertTrue(('qnames' not in e.kwargs))
self.assertTrue(('responses' not in e.kwargs))
try:
raise dns.resolver.NXDOMAIN("errmsg", -1)
except dns.exception.DNSException as e:
self.assertEqual(e.args, ("errmsg", -1))
self.assertTrue(('kwargs' in dir(e)))
self.assertEqual(str(e), "('errmsg', -1)", str(e))
self.assertTrue(('qnames' not in e.kwargs))
self.assertTrue(('responses' not in e.kwargs))
try:
raise dns.resolver.NXDOMAIN(qnames=None)
except Exception as e:
self.assertTrue((isinstance(e, AttributeError)))
try:
raise dns.resolver.NXDOMAIN(qnames=n1)
except Exception as e:
self.assertTrue((isinstance(e, AttributeError)))
try:
raise dns.resolver.NXDOMAIN(qnames=[])
except Exception as e:
self.assertTrue((isinstance(e, AttributeError)))
try:
raise dns.resolver.NXDOMAIN(qnames=[n1])
except dns.exception.DNSException as e:
MSG = "The DNS query name does not exist: a.b."
self.assertEqual(e.args, (MSG,), repr(e.args))
self.assertTrue(('kwargs' in dir(e)))
self.assertEqual(str(e), MSG, str(e))
self.assertTrue(('qnames' in e.kwargs))
self.assertEqual(e.kwargs['qnames'], [n1])
self.assertTrue(('responses' in e.kwargs))
self.assertEqual(e.kwargs['responses'], {})
try:
raise dns.resolver.NXDOMAIN(qnames=[n2, n1])
except dns.resolver.NXDOMAIN as e:
e0 = dns.resolver.NXDOMAIN("errmsg")
e = e0 + e
MSG = "None of DNS query names exist: a.b.s., a.b."
self.assertEqual(e.args, (MSG,), repr(e.args))
self.assertTrue(('kwargs' in dir(e)))
self.assertEqual(str(e), MSG, str(e))
self.assertTrue(('qnames' in e.kwargs))
self.assertEqual(e.kwargs['qnames'], [n2, n1])
self.assertTrue(('responses' in e.kwargs))
self.assertEqual(e.kwargs['responses'], {})
try:
raise dns.resolver.NXDOMAIN(qnames=[n1], responses=['r1.1'])
except Exception as e:
self.assertTrue((isinstance(e, AttributeError)))
try:
raise dns.resolver.NXDOMAIN(qnames=[n1], responses={n1: 'r1.1'})
except dns.resolver.NXDOMAIN as e:
MSG = "The DNS query name does not exist: a.b."
self.assertEqual(e.args, (MSG,), repr(e.args))
self.assertTrue(('kwargs' in dir(e)))
self.assertEqual(str(e), MSG, str(e))
self.assertTrue(('qnames' in e.kwargs))
self.assertEqual(e.kwargs['qnames'], [n1])
self.assertTrue(('responses' in e.kwargs))
self.assertEqual(e.kwargs['responses'], {n1: 'r1.1'})
def test_nxdomain_merge(self):
n1 = dns.name.Name(('a', 'b', ''))
n2 = dns.name.Name(('a', 'b', ''))
n3 = dns.name.Name(('a', 'b', 'c', ''))
n4 = dns.name.Name(('a', 'b', 'd', ''))
responses1 = {n1: 'r1.1', n2: 'r1.2', n4: 'r1.4'}
qnames1 = [n1, n4] # n2 == n1
responses2 = {n2: 'r2.2', n3: 'r2.3'}
qnames2 = [n2, n3]
e0 = dns.resolver.NXDOMAIN()
e1 = dns.resolver.NXDOMAIN(qnames=qnames1, responses=responses1)
e2 = dns.resolver.NXDOMAIN(qnames=qnames2, responses=responses2)
e = e1 + e0 + e2
self.assertRaises(AttributeError, lambda: e0 + e0)
self.assertEqual(e.kwargs['qnames'], [n1, n4, n3],
repr(e.kwargs['qnames']))
self.assertTrue(e.kwargs['responses'][n1].startswith('r2.'))
self.assertTrue(e.kwargs['responses'][n2].startswith('r2.'))
self.assertTrue(e.kwargs['responses'][n3].startswith('r2.'))
self.assertTrue(e.kwargs['responses'][n4].startswith('r1.'))
def test_nxdomain_canonical_name(self):
cname1 = "91.11.8-22.17.172.in-addr.arpa."
cname2 = "91-11-17-172.dynamic.example."
message0 = dns.message.from_text(dangling_cname_0_message_text)
message1 = dns.message.from_text(dangling_cname_1_message_text)
message2 = dns.message.from_text(dangling_cname_2_message_text)
qname0 = message0.question[0].name
qname1 = message1.question[0].name
qname2 = message2.question[0].name
responses = {qname0: message0, qname1: message1, qname2: message2}
eX = dns.resolver.NXDOMAIN()
e0 = dns.resolver.NXDOMAIN(qnames=[qname0], responses=responses)
e1 = dns.resolver.NXDOMAIN(qnames=[qname0, qname1, qname2], responses=responses)
e2 = dns.resolver.NXDOMAIN(qnames=[qname0, qname2, qname1], responses=responses)
self.assertRaises(TypeError, lambda: eX.canonical_name)
self.assertEqual(e0.canonical_name, qname0)
self.assertEqual(e1.canonical_name, dns.name.from_text(cname1))
self.assertEqual(e2.canonical_name, dns.name.from_text(cname2))
class ResolverMiscTestCase(unittest.TestCase):
if sys.platform != 'win32':
def test_read_nonexistent_config(self):
res = dns.resolver.Resolver(configure=False)
pathname = '/etc/nonexistent-resolv.conf'
self.assertRaises(dns.resolver.NoResolverConfiguration,
lambda: res.read_resolv_conf(pathname))
def test_compute_timeout(self):
res = dns.resolver.Resolver(configure=False)
now = time.time()
self.assertRaises(dns.resolver.Timeout,
lambda: res._compute_timeout(now + 10000))
self.assertRaises(dns.resolver.Timeout,
lambda: res._compute_timeout(0))
# not raising is the test
res._compute_timeout(now + 0.5)
if sys.platform == 'win32':
def test_configure_win32_domain(self):
n = dns.name.from_text('home.')
self.assertEqual(n, dns.win32util._config_domain('home'))
self.assertEqual(n, dns.win32util._config_domain('.home'))
class ResolverNameserverValidTypeTestCase(unittest.TestCase):
def test_set_nameservers_to_list(self):
resolver = dns.resolver.Resolver(configure=False)
resolver.nameservers = ['1.2.3.4']
self.assertEqual(resolver.nameservers, ['1.2.3.4'])
def test_set_namservers_to_empty_list(self):
resolver = dns.resolver.Resolver(configure=False)
resolver.nameservers = []
self.assertEqual(resolver.nameservers, [])
def test_set_nameservers_invalid_type(self):
resolver = dns.resolver.Resolver(configure=False)
invalid_nameservers = [None, '1.2.3.4', 1234, (1, 2, 3, 4), {'invalid': 'nameserver'}]
for invalid_nameserver in invalid_nameservers:
with self.assertRaises(ValueError):
resolver.nameservers = invalid_nameserver
class NaptrNanoNameserver(Server):
def handle(self, request):
response = dns.message.make_response(request.message)
response.set_rcode(dns.rcode.REFUSED)
response.flags |= dns.flags.RA
try:
zero_subdomain = dns.e164.from_e164('0')
if request.qname.is_subdomain(zero_subdomain):
response.set_rcode(dns.rcode.NXDOMAIN)
response.flags |= dns.flags.AA
elif request.qtype == dns.rdatatype.NAPTR and \
request.qclass == dns.rdataclass.IN:
rrs = dns.rrset.from_text(request.qname, 300, 'IN', 'NAPTR',
'0 0 "" "" "" .')
response.answer.append(rrs)
response.set_rcode(dns.rcode.NOERROR)
response.flags |= dns.flags.AA
except Exception:
pass
return response
@unittest.skipIf(not (_network_available and _nanonameserver_available),
"Internet and NanoAuth required")
class NanoTests(unittest.TestCase):
def testE164Query(self):
with NaptrNanoNameserver() as na:
res = dns.resolver.Resolver(configure=False)
res.port = na.udp_address[1]
res.nameservers = [na.udp_address[0]]
answer = dns.e164.query('1650551212', ['e164.arpa'], res)
self.assertEqual(answer[0].order, 0)
self.assertEqual(answer[0].preference, 0)
self.assertEqual(answer[0].flags, b'')
self.assertEqual(answer[0].service, b'')
self.assertEqual(answer[0].regexp, b'')
self.assertEqual(answer[0].replacement, dns.name.root)
with self.assertRaises(dns.resolver.NXDOMAIN):
dns.e164.query('0123456789', ['e164.arpa'], res)
class AlwaysType3NXDOMAINNanoNameserver(Server):
def handle(self, request):
response = dns.message.make_response(request.message)
response.set_rcode(dns.rcode.NXDOMAIN)
response.flags |= dns.flags.RA
return response
class AlwaysNXDOMAINNanoNameserver(Server):
def handle(self, request):
response = dns.message.make_response(request.message)
response.set_rcode(dns.rcode.NXDOMAIN)
response.flags |= dns.flags.RA
origin = dns.name.from_text('example.')
soa_rrset = response.find_rrset(response.authority, origin,
dns.rdataclass.IN, dns.rdatatype.SOA,
create=True)
rdata = dns.rdata.from_text('IN', 'SOA',
'ns.example. root.example. 1 2 3 4 5')
soa_rrset.add(rdata)
soa_rrset.update_ttl(300)
return response
class AlwaysNoErrorNoDataNanoNameserver(Server):
def handle(self, request):
response = dns.message.make_response(request.message)
response.set_rcode(dns.rcode.NOERROR)
response.flags |= dns.flags.RA
origin = dns.name.from_text('example.')
soa_rrset = response.find_rrset(response.authority, origin,
dns.rdataclass.IN, dns.rdatatype.SOA,
create=True)
rdata = dns.rdata.from_text('IN', 'SOA',
'ns.example. root.example. 1 2 3 4 5')
soa_rrset.add(rdata)
soa_rrset.update_ttl(300)
return response
@unittest.skipIf(not (_network_available and _nanonameserver_available),
"Internet and NanoAuth required")
class ZoneForNameTests(unittest.TestCase):
def testNoRootSOA(self):
with AlwaysType3NXDOMAINNanoNameserver() as na:
res = dns.resolver.Resolver(configure=False)
res.port = na.udp_address[1]
res.nameservers = [na.udp_address[0]]
with self.assertRaises(dns.resolver.NoRootSOA):
dns.resolver.zone_for_name('www.foo.bar.', resolver=res)
def testHelpfulNXDOMAIN(self):
with AlwaysNXDOMAINNanoNameserver() as na:
res = dns.resolver.Resolver(configure=False)
res.port = na.udp_address[1]
res.nameservers = [na.udp_address[0]]
expected = dns.name.from_text('example.')
name = dns.resolver.zone_for_name('1.2.3.4.5.6.7.8.9.10.example.',
resolver=res)
self.assertEqual(name, expected)
def testHelpfulNoErrorNoData(self):
with AlwaysNoErrorNoDataNanoNameserver() as na:
res = dns.resolver.Resolver(configure=False)
res.port = na.udp_address[1]
res.nameservers = [na.udp_address[0]]
expected = dns.name.from_text('example.')
name = dns.resolver.zone_for_name('1.2.3.4.5.6.7.8.9.10.example.',
resolver=res)
self.assertEqual(name, expected)
class DroppingNanoNameserver(Server):
def handle(self, request):
return None
class FormErrNanoNameserver(Server):
def handle(self, request):
r = dns.message.make_response(request.message)
r.set_rcode(dns.rcode.FORMERR)
return r
# we use pytest for these so we can have a "slow" mark later if we want to
# (right now it's still fast enough we don't really need it)
@pytest.mark.skipif(not (_network_available and _nanonameserver_available),
reason="Internet and NanoAuth required")
def testResolverTimeout():
with DroppingNanoNameserver() as na:
res = dns.resolver.Resolver(configure=False)
res.port = na.udp_address[1]
res.nameservers = [na.udp_address[0]]
res.timeout = 0.2
try:
lifetime = 1.0
a = res.resolve('www.dnspython.org', lifetime=lifetime)
assert False # should never happen
except dns.resolver.LifetimeTimeout as e:
assert e.kwargs['timeout'] >= lifetime
# The length of errors can vary based on how slow things are,
# but it ought to be > 1, so we assert that.
errors = e.kwargs['errors']
assert len(errors) > 1
for error in errors:
assert error[0] == na.udp_address[0] # address
assert not error[1] # not TCP
assert error[2] == na.udp_address[1] # port
assert isinstance(error[3], dns.exception.Timeout) # exception
@pytest.mark.skipif(not (_network_available and _nanonameserver_available),
reason="Internet and NanoAuth required")
def testResolverNoNameservers():
with FormErrNanoNameserver() as na:
res = dns.resolver.Resolver(configure=False)
res.port = na.udp_address[1]
res.nameservers = [na.udp_address[0]]
try:
a = res.resolve('www.dnspython.org')
assert False # should never happen
except dns.resolver.NoNameservers as e:
errors = e.kwargs['errors']
assert len(errors) == 1
for error in errors:
assert error[0] == na.udp_address[0] # address
assert not error[1] # not TCP
assert error[2] == na.udp_address[1] # port
assert error[3] == 'FORMERR'
class SlowAlwaysType3NXDOMAINNanoNameserver(Server):
def handle(self, request):
response = dns.message.make_response(request.message)
response.set_rcode(dns.rcode.NXDOMAIN)
response.flags |= dns.flags.RA
time.sleep(0.2)
return response
@pytest.mark.skipif(not (_network_available and _nanonameserver_available),
reason="Internet and NanoAuth required")
def testZoneForNameLifetimeTimeout():
with SlowAlwaysType3NXDOMAINNanoNameserver() as na:
res = dns.resolver.Resolver(configure=False)
res.port = na.udp_address[1]
res.nameservers = [na.udp_address[0]]
with pytest.raises(dns.resolver.LifetimeTimeout):
dns.resolver.zone_for_name('1.2.3.4.5.6.7.8.9.10.example.',
resolver=res, lifetime=1.0)