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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
try:
import ssl
_have_ssl = True
except Exception:
_have_ssl = False
import dns.edns
import dns.message
import dns.query
import dns.rdatatype
import dns.resolver
if dns.query._have_httpx:
import httpx
import tests.util
resolver_v4_addresses = []
resolver_v6_addresses = []
family = socket.AF_UNSPEC
if tests.util.have_ipv4():
resolver_v4_addresses = [
"1.1.1.1",
"8.8.8.8",
# '9.9.9.9',
]
family = socket.AF_INET
if tests.util.have_ipv6():
resolver_v6_addresses = [
"2606:4700:4700::1111",
"2001:4860:4860::8888",
# '2620:fe::fe',
]
if family == socket.AF_INET:
# we have both working, go back to UNSPEC
family = socket.AF_UNSPEC
else:
# v6 only
family = socket.AF_INET6
KNOWN_ANYCAST_DOH_RESOLVER_URLS = [
"https://cloudflare-dns.com/dns-query",
"https://dns.google/dns-query",
# 'https://dns11.quad9.net/dns-query',
]
KNOWN_PAD_AWARE_DOH_RESOLVER_URLS = [
"https://cloudflare-dns.com/dns-query",
"https://dns.google/dns-query",
]
@unittest.skipUnless(
dns.query._have_httpx and tests.util.is_internet_reachable() and _have_ssl,
"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,
family=family,
)
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,
family=family,
)
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,
family=family,
)
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)
# And if we don't mangle the URL, it should work.
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)
def test_padded_get(self):
nameserver_url = random.choice(KNOWN_PAD_AWARE_DOH_RESOLVER_URLS)
q = dns.message.make_query("example.com.", dns.rdatatype.A, use_edns=0, pad=128)
r = dns.query.https(
q, nameserver_url, session=self.session, post=False, timeout=4
)
self.assertTrue(q.is_response(r))
# the response should have a padding option
self.assertIsNotNone(r.opt)
has_pad = False
for o in r.opt[0].options:
if o.otype == dns.edns.OptionType.PADDING:
has_pad = True
self.assertTrue(has_pad)
if __name__ == "__main__":
unittest.main()
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