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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# 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.
import unittest
import random
import socket
import dns.message
import dns.query
import dns.rdatatype
import dns.resolver
if dns.query._have_requests:
import requests
from requests.exceptions import SSLError
if dns.query._have_httpx:
import httpx
# Probe for IPv4 and IPv6
resolver_v4_addresses = []
resolver_v6_addresses = []
try:
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
s.settimeout(4)
s.connect(('8.8.8.8', 53))
resolver_v4_addresses = [
'1.1.1.1',
'8.8.8.8',
# '9.9.9.9',
]
except Exception:
pass
try:
with socket.socket(socket.AF_INET6, socket.SOCK_DGRAM) as s:
s.connect(('2001:4860:4860::8888', 53))
resolver_v6_addresses = [
'2606:4700:4700::1111',
# Google says 404
# '2001:4860:4860::8888',
# '2620:fe::fe',
]
except Exception:
pass
KNOWN_ANYCAST_DOH_RESOLVER_URLS = ['https://cloudflare-dns.com/dns-query',
'https://dns.google/dns-query',
# 'https://dns11.quad9.net/dns-query',
]
# 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
@unittest.skipUnless(dns.query._have_requests and _network_available,
"Python requests cannot be imported; no DNS over HTTPS (DOH)")
class DNSOverHTTPSTestCaseRequests(unittest.TestCase):
def setUp(self):
self.session = requests.sessions.Session()
def tearDown(self):
self.session.close()
def test_get_request(self):
nameserver_url = random.choice(KNOWN_ANYCAST_DOH_RESOLVER_URLS)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_url, session=self.session, post=False,
timeout=4)
self.assertTrue(q.is_response(r))
def test_post_request(self):
nameserver_url = random.choice(KNOWN_ANYCAST_DOH_RESOLVER_URLS)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_url, session=self.session, post=True,
timeout=4)
self.assertTrue(q.is_response(r))
def test_build_url_from_ip(self):
self.assertTrue(resolver_v4_addresses or resolver_v6_addresses)
if resolver_v4_addresses:
nameserver_ip = random.choice(resolver_v4_addresses)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
# For some reason Google's DNS over HTTPS fails when you POST to
# https://8.8.8.8/dns-query
# So we're just going to do GET requests here
r = dns.query.https(q, nameserver_ip, session=self.session,
post=False, timeout=4)
self.assertTrue(q.is_response(r))
if resolver_v6_addresses:
nameserver_ip = random.choice(resolver_v6_addresses)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_ip, session=self.session,
post=False, timeout=4)
self.assertTrue(q.is_response(r))
def test_bootstrap_address(self):
# We test this to see if v4 is available
if resolver_v4_addresses:
ip = '185.228.168.168'
invalid_tls_url = 'https://{}/doh/family-filter/'.format(ip)
valid_tls_url = 'https://doh.cleanbrowsing.org/doh/family-filter/'
q = dns.message.make_query('example.com.', dns.rdatatype.A)
# make sure CleanBrowsing's IP address will fail TLS certificate
# check
with self.assertRaises(SSLError):
dns.query.https(q, invalid_tls_url, session=self.session,
timeout=4)
# use host header
r = dns.query.https(q, valid_tls_url, session=self.session,
bootstrap_address=ip, timeout=4)
self.assertTrue(q.is_response(r))
def test_new_session(self):
nameserver_url = random.choice(KNOWN_ANYCAST_DOH_RESOLVER_URLS)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_url, timeout=4)
self.assertTrue(q.is_response(r))
def test_resolver(self):
res = dns.resolver.Resolver(configure=False)
res.nameservers = ['https://dns.google/dns-query']
answer = res.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)
@unittest.skipUnless(dns.query._have_httpx and _network_available,
"Python httpx cannot be imported; no DNS over HTTPS (DOH)")
class DNSOverHTTPSTestCaseHttpx(unittest.TestCase):
def setUp(self):
self.session = httpx.Client(http1=True, http2=True, verify=True)
def tearDown(self):
self.session.close()
def test_get_request(self):
nameserver_url = random.choice(KNOWN_ANYCAST_DOH_RESOLVER_URLS)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_url, session=self.session, post=False,
timeout=4)
self.assertTrue(q.is_response(r))
def test_get_request_http1(self):
saved_have_http2 = dns.query._have_http2
try:
dns.query._have_http2 = False
nameserver_url = random.choice(KNOWN_ANYCAST_DOH_RESOLVER_URLS)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_url, session=self.session, post=False,
timeout=4)
self.assertTrue(q.is_response(r))
finally:
dns.query._have_http2 = saved_have_http2
def test_post_request(self):
nameserver_url = random.choice(KNOWN_ANYCAST_DOH_RESOLVER_URLS)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_url, session=self.session, post=True,
timeout=4)
self.assertTrue(q.is_response(r))
def test_build_url_from_ip(self):
self.assertTrue(resolver_v4_addresses or resolver_v6_addresses)
if resolver_v4_addresses:
nameserver_ip = random.choice(resolver_v4_addresses)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
# For some reason Google's DNS over HTTPS fails when you POST to
# https://8.8.8.8/dns-query
# So we're just going to do GET requests here
r = dns.query.https(q, nameserver_ip, session=self.session,
post=False, timeout=4)
self.assertTrue(q.is_response(r))
if resolver_v6_addresses:
nameserver_ip = random.choice(resolver_v6_addresses)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_ip, session=self.session,
post=False, timeout=4)
self.assertTrue(q.is_response(r))
def test_bootstrap_address_fails(self):
# We test this to see if v4 is available
if resolver_v4_addresses:
ip = '185.228.168.168'
invalid_tls_url = 'https://{}/doh/family-filter/'.format(ip)
valid_tls_url = 'https://doh.cleanbrowsing.org/doh/family-filter/'
q = dns.message.make_query('example.com.', dns.rdatatype.A)
# make sure CleanBrowsing's IP address will fail TLS certificate
# check
with self.assertRaises(httpx.ConnectError):
dns.query.https(q, invalid_tls_url, session=self.session,
timeout=4)
# We can't do the Host header and SNI magic with httpx, but
# we are demanding httpx be used by providing a session, so
# we should get a NoDOH exception.
with self.assertRaises(dns.query.NoDOH):
dns.query.https(q, valid_tls_url, session=self.session,
bootstrap_address=ip, timeout=4)
def test_new_session(self):
nameserver_url = random.choice(KNOWN_ANYCAST_DOH_RESOLVER_URLS)
q = dns.message.make_query('example.com.', dns.rdatatype.A)
r = dns.query.https(q, nameserver_url, timeout=4)
self.assertTrue(q.is_response(r))
def test_resolver(self):
res = dns.resolver.Resolver(configure=False)
res.nameservers = ['https://dns.google/dns-query']
answer = res.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)
if __name__ == '__main__':
unittest.main()
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