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"""Unit tests for zeroconf.py"""
from __future__ import annotations
import logging
import socket
import time
import unittest.mock
from unittest.mock import patch
import zeroconf as r
from zeroconf import ServiceInfo, Zeroconf, const
from . import _inject_responses
log = logging.getLogger("zeroconf")
original_logging_level = logging.NOTSET
def setup_module():
global original_logging_level
original_logging_level = log.level
log.setLevel(logging.DEBUG)
def teardown_module():
if original_logging_level != logging.NOTSET:
log.setLevel(original_logging_level)
class Names(unittest.TestCase):
def test_long_name(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
question = r.DNSQuestion(
"this.is.a.very.long.name.with.lots.of.parts.in.it.local.",
const._TYPE_SRV,
const._CLASS_IN,
)
generated.add_question(question)
r.DNSIncoming(generated.packets()[0])
def test_exceedingly_long_name(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
name = f"{'part.' * 1000}local."
question = r.DNSQuestion(name, const._TYPE_SRV, const._CLASS_IN)
generated.add_question(question)
r.DNSIncoming(generated.packets()[0])
def test_extra_exceedingly_long_name(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
name = f"{'part.' * 4000}local."
question = r.DNSQuestion(name, const._TYPE_SRV, const._CLASS_IN)
generated.add_question(question)
r.DNSIncoming(generated.packets()[0])
def test_exceedingly_long_name_part(self):
name = f"{'a' * 1000}.local."
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
question = r.DNSQuestion(name, const._TYPE_SRV, const._CLASS_IN)
generated.add_question(question)
self.assertRaises(r.NamePartTooLongException, generated.packets)
def test_same_name(self):
name = "paired.local."
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
question = r.DNSQuestion(name, const._TYPE_SRV, const._CLASS_IN)
generated.add_question(question)
generated.add_question(question)
r.DNSIncoming(generated.packets()[0])
def test_verify_name_change_with_lots_of_names(self):
# instantiate a zeroconf instance
zc = Zeroconf(interfaces=["127.0.0.1"])
# create a bunch of servers
type_ = "_my-service._tcp.local."
name = "a wonderful service"
server_count = 300
self.generate_many_hosts(zc, type_, name, server_count)
# verify that name changing works
self.verify_name_change(zc, type_, name, server_count)
zc.close()
def test_large_packet_exception_log_handling(self):
"""Verify we downgrade debug after warning."""
# instantiate a zeroconf instance
zc = Zeroconf(interfaces=["127.0.0.1"])
with (
patch("zeroconf._logger.log.warning") as mocked_log_warn,
patch("zeroconf._logger.log.debug") as mocked_log_debug,
):
# now that we have a long packet in our possession, let's verify the
# exception handling.
out = r.DNSOutgoing(const._FLAGS_QR_RESPONSE | const._FLAGS_AA)
out.data.append(b"\0" * 10000)
# mock the zeroconf logger and check for the correct logging backoff
call_counts = mocked_log_warn.call_count, mocked_log_debug.call_count
# try to send an oversized packet
zc.send(out)
assert mocked_log_warn.call_count == call_counts[0]
zc.send(out)
assert mocked_log_warn.call_count == call_counts[0]
# mock the zeroconf logger and check for the correct logging backoff
call_counts = mocked_log_warn.call_count, mocked_log_debug.call_count
# force receive on oversized packet
zc.send(out, const._MDNS_ADDR, const._MDNS_PORT)
zc.send(out, const._MDNS_ADDR, const._MDNS_PORT)
time.sleep(0.3)
r.log.debug(
"warn %d debug %d was %s",
mocked_log_warn.call_count,
mocked_log_debug.call_count,
call_counts,
)
assert mocked_log_debug.call_count > call_counts[0]
# close our zeroconf which will close the sockets
zc.close()
def verify_name_change(self, zc, type_, name, number_hosts):
desc = {"path": "/~paulsm/"}
info_service = ServiceInfo(
type_,
f"{name}.{type_}",
80,
0,
0,
desc,
"ash-2.local.",
addresses=[socket.inet_aton("10.0.1.2")],
)
# verify name conflict
self.assertRaises(r.NonUniqueNameException, zc.register_service, info_service)
# verify no name conflict https://tools.ietf.org/html/rfc6762#section-6.6
zc.register_service(info_service, cooperating_responders=True)
# Create a new object since allow_name_change will mutate the
# original object and then we will have the wrong service
# in the registry
info_service2 = ServiceInfo(
type_,
f"{name}.{type_}",
80,
0,
0,
desc,
"ash-2.local.",
addresses=[socket.inet_aton("10.0.1.2")],
)
zc.register_service(info_service2, allow_name_change=True)
assert info_service2.name.split(".")[0] == f"{name}-{number_hosts + 1}"
def generate_many_hosts(self, zc, type_, name, number_hosts):
block_size = 25
number_hosts = int((number_hosts - 1) / block_size + 1) * block_size
out = r.DNSOutgoing(const._FLAGS_QR_RESPONSE | const._FLAGS_AA)
for i in range(1, number_hosts + 1):
next_name = name if i == 1 else f"{name}-{i}"
self.generate_host(out, next_name, type_)
_inject_responses(zc, [r.DNSIncoming(packet) for packet in out.packets()])
@staticmethod
def generate_host(out, host_name, type_):
name = ".".join((host_name, type_))
out.add_answer_at_time(
r.DNSPointer(type_, const._TYPE_PTR, const._CLASS_IN, const._DNS_OTHER_TTL, name),
0,
)
out.add_answer_at_time(
r.DNSService(
type_,
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
name,
),
0,
)
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