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1083 lines (959 loc) · 43.3 KB
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"""Unit tests for zeroconf._protocol"""
from __future__ import annotations
import copy
import logging
import os
import socket
import struct
import unittest.mock
from typing import cast
import pytest
import zeroconf as r
from zeroconf import DNSHinfo, DNSIncoming, DNSText, const, current_time_millis
from . import has_working_ipv6
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 PacketGeneration(unittest.TestCase):
def test_parse_own_packet_simple(self):
generated = r.DNSOutgoing(0)
r.DNSIncoming(generated.packets()[0])
def test_parse_own_packet_simple_unicast(self):
generated = r.DNSOutgoing(0, False)
r.DNSIncoming(generated.packets()[0])
def test_parse_own_packet_flags(self):
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
r.DNSIncoming(generated.packets()[0])
def test_parse_own_packet_question(self):
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
generated.add_question(r.DNSQuestion("testname.local.", const._TYPE_SRV, const._CLASS_IN))
r.DNSIncoming(generated.packets()[0])
def test_parse_own_packet_nsec(self):
answer = r.DNSNsec(
"eufy HomeBase2-2464._hap._tcp.local.",
const._TYPE_NSEC,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"eufy HomeBase2-2464._hap._tcp.local.",
[const._TYPE_TXT, const._TYPE_SRV],
)
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
generated.add_answer_at_time(answer, 0)
parsed = r.DNSIncoming(generated.packets()[0])
assert answer in parsed.answers()
# Now with the higher RD type first
answer = r.DNSNsec(
"eufy HomeBase2-2464._hap._tcp.local.",
const._TYPE_NSEC,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"eufy HomeBase2-2464._hap._tcp.local.",
[const._TYPE_SRV, const._TYPE_TXT],
)
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
generated.add_answer_at_time(answer, 0)
parsed = r.DNSIncoming(generated.packets()[0])
assert answer in parsed.answers()
# Types > 255 should raise an exception
answer_invalid_types = r.DNSNsec(
"eufy HomeBase2-2464._hap._tcp.local.",
const._TYPE_NSEC,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"eufy HomeBase2-2464._hap._tcp.local.",
[const._TYPE_TXT, const._TYPE_SRV, 1000],
)
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
generated.add_answer_at_time(answer_invalid_types, 0)
with pytest.raises(ValueError, match="rdtype 1000 is too large for NSEC"):
generated.packets()
# Empty rdtypes are not allowed
answer_invalid_types = r.DNSNsec(
"eufy HomeBase2-2464._hap._tcp.local.",
const._TYPE_NSEC,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"eufy HomeBase2-2464._hap._tcp.local.",
[],
)
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
generated.add_answer_at_time(answer_invalid_types, 0)
with pytest.raises(ValueError, match="NSEC must have at least one rdtype"):
generated.packets()
def test_parse_own_packet_response(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
generated.add_answer_at_time(
r.DNSService(
"æøå.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
"foo.local.",
),
0,
)
parsed = r.DNSIncoming(generated.packets()[0])
assert len(generated.answers) == 1
assert len(generated.answers) == len(parsed.answers())
def test_adding_empty_answer(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
generated.add_answer_at_time(
None,
0,
)
generated.add_answer_at_time(
r.DNSService(
"æøå.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
"foo.local.",
),
0,
)
parsed = r.DNSIncoming(generated.packets()[0])
assert len(generated.answers) == 1
assert len(generated.answers) == len(parsed.answers())
def test_adding_expired_answer(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
generated.add_answer_at_time(
r.DNSService(
"æøå.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
"foo.local.",
),
current_time_millis() + 1000000,
)
parsed = r.DNSIncoming(generated.packets()[0])
assert len(generated.answers) == 0
assert len(generated.answers) == len(parsed.answers())
def test_match_question(self):
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
question = r.DNSQuestion("testname.local.", const._TYPE_SRV, const._CLASS_IN)
generated.add_question(question)
parsed = r.DNSIncoming(generated.packets()[0])
assert len(generated.questions) == 1
assert len(generated.questions) == len(parsed.questions)
assert question == parsed.questions[0]
def test_suppress_answer(self):
query_generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
question = r.DNSQuestion("testname.local.", const._TYPE_SRV, const._CLASS_IN)
query_generated.add_question(question)
answer1 = r.DNSService(
"testname1.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
"foo.local.",
)
staleanswer2 = r.DNSService(
"testname2.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL / 2,
0,
0,
80,
"foo.local.",
)
answer2 = r.DNSService(
"testname2.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
"foo.local.",
)
query_generated.add_answer_at_time(answer1, 0)
query_generated.add_answer_at_time(staleanswer2, 0)
query = r.DNSIncoming(query_generated.packets()[0])
# Should be suppressed
response = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
response.add_answer(query, answer1)
assert len(response.answers) == 0
# Should not be suppressed, TTL in query is too short
response.add_answer(query, answer2)
assert len(response.answers) == 1
# Should not be suppressed, name is different
tmp = copy.copy(answer1)
tmp.key = "testname3.local."
tmp.name = "testname3.local."
response.add_answer(query, tmp)
assert len(response.answers) == 2
# Should not be suppressed, type is different
tmp = copy.copy(answer1)
tmp.type = const._TYPE_A
response.add_answer(query, tmp)
assert len(response.answers) == 3
# Should not be suppressed, class is different
tmp = copy.copy(answer1)
tmp.class_ = const._CLASS_NONE
response.add_answer(query, tmp)
assert len(response.answers) == 4
# ::TODO:: could add additional tests for DNSAddress, DNSHinfo, DNSPointer, DNSText, DNSService
def test_dns_hinfo(self):
generated = r.DNSOutgoing(0)
generated.add_additional_answer(DNSHinfo("irrelevant", const._TYPE_HINFO, 0, 0, "cpu", "os"))
parsed = r.DNSIncoming(generated.packets()[0])
answer = cast(r.DNSHinfo, parsed.answers()[0])
assert answer.cpu == "cpu"
assert answer.os == "os"
generated = r.DNSOutgoing(0)
generated.add_additional_answer(DNSHinfo("irrelevant", const._TYPE_HINFO, 0, 0, "cpu", "x" * 257))
self.assertRaises(r.NamePartTooLongException, generated.packets)
def test_many_questions(self):
"""Test many questions get separated into multiple packets."""
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
questions = []
for i in range(100):
question = r.DNSQuestion(f"testname{i}.local.", const._TYPE_SRV, const._CLASS_IN)
generated.add_question(question)
questions.append(question)
assert len(generated.questions) == 100
packets = generated.packets()
assert len(packets) == 2
assert len(packets[0]) < const._MAX_MSG_TYPICAL
assert len(packets[1]) < const._MAX_MSG_TYPICAL
parsed1 = r.DNSIncoming(packets[0])
assert len(parsed1.questions) == 85
parsed2 = r.DNSIncoming(packets[1])
assert len(parsed2.questions) == 15
def test_many_questions_with_many_known_answers(self):
"""Test many questions and known answers get separated into multiple packets."""
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
questions = []
for _ in range(30):
question = r.DNSQuestion("_hap._tcp.local.", const._TYPE_PTR, const._CLASS_IN)
generated.add_question(question)
questions.append(question)
assert len(generated.questions) == 30
now = current_time_millis()
for _ in range(200):
known_answer = r.DNSPointer(
"myservice{i}_tcp._tcp.local.",
const._TYPE_PTR,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"123.local.",
)
generated.add_answer_at_time(known_answer, now)
packets = generated.packets()
assert len(packets) == 3
assert len(packets[0]) <= const._MAX_MSG_TYPICAL
assert len(packets[1]) <= const._MAX_MSG_TYPICAL
assert len(packets[2]) <= const._MAX_MSG_TYPICAL
parsed1 = r.DNSIncoming(packets[0])
assert len(parsed1.questions) == 30
assert len(parsed1.answers()) == 88
assert parsed1.truncated
parsed2 = r.DNSIncoming(packets[1])
assert len(parsed2.questions) == 0
assert len(parsed2.answers()) == 101
assert parsed2.truncated
parsed3 = r.DNSIncoming(packets[2])
assert len(parsed3.questions) == 0
assert len(parsed3.answers()) == 11
assert not parsed3.truncated
def test_massive_probe_packet_split(self):
"""Test probe with many authoritative answers."""
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY | const._FLAGS_AA)
questions = []
for _ in range(30):
question = r.DNSQuestion(
"_hap._tcp.local.",
const._TYPE_PTR,
const._CLASS_IN | const._CLASS_UNIQUE,
)
generated.add_question(question)
questions.append(question)
assert len(generated.questions) == 30
for _ in range(200):
authorative_answer = r.DNSPointer(
"myservice{i}_tcp._tcp.local.",
const._TYPE_PTR,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"123.local.",
)
generated.add_authorative_answer(authorative_answer)
packets = generated.packets()
assert len(packets) == 3
assert len(packets[0]) <= const._MAX_MSG_TYPICAL
assert len(packets[1]) <= const._MAX_MSG_TYPICAL
assert len(packets[2]) <= const._MAX_MSG_TYPICAL
parsed1 = r.DNSIncoming(packets[0])
assert parsed1.questions[0].unicast is True
assert len(parsed1.questions) == 30
assert parsed1.num_questions == 30
assert parsed1.num_authorities == 88
assert parsed1.truncated
parsed2 = r.DNSIncoming(packets[1])
assert len(parsed2.questions) == 0
assert parsed2.num_authorities == 101
assert parsed2.truncated
parsed3 = r.DNSIncoming(packets[2])
assert len(parsed3.questions) == 0
assert parsed3.num_authorities == 11
assert not parsed3.truncated
def test_only_one_answer_can_by_large(self):
"""Test that only the first answer in each packet can be large.
https://datatracker.ietf.org/doc/html/rfc6762#section-17
"""
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
query = r.DNSIncoming(r.DNSOutgoing(const._FLAGS_QR_QUERY).packets()[0])
for _i in range(3):
generated.add_answer(
query,
r.DNSText(
"zoom._hap._tcp.local.",
const._TYPE_TXT,
const._CLASS_IN | const._CLASS_UNIQUE,
1200,
b"\x04ff=0\x04ci=2\x04sf=0\x0bsh=6fLM5A==" * 100,
),
)
generated.add_answer(
query,
r.DNSService(
"testname1.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
"foo.local.",
),
)
assert len(generated.answers) == 4
packets = generated.packets()
assert len(packets) == 4
assert len(packets[0]) <= const._MAX_MSG_ABSOLUTE
assert len(packets[0]) > const._MAX_MSG_TYPICAL
assert len(packets[1]) <= const._MAX_MSG_ABSOLUTE
assert len(packets[1]) > const._MAX_MSG_TYPICAL
assert len(packets[2]) <= const._MAX_MSG_ABSOLUTE
assert len(packets[2]) > const._MAX_MSG_TYPICAL
assert len(packets[3]) <= const._MAX_MSG_TYPICAL
for packet in packets:
parsed = r.DNSIncoming(packet)
assert len(parsed.answers()) == 1
def test_questions_do_not_end_up_every_packet(self):
"""Test that questions are not sent again when multiple packets are needed.
https://datatracker.ietf.org/doc/html/rfc6762#section-7.2
Sometimes a Multicast DNS querier will already have too many answers
to fit in the Known-Answer Section of its query packets.... It MUST
immediately follow the packet with another query packet containing no
questions and as many more Known-Answer records as will fit.
"""
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
for i in range(35):
question = r.DNSQuestion(f"testname{i}.local.", const._TYPE_SRV, const._CLASS_IN)
generated.add_question(question)
answer = r.DNSService(
f"testname{i}.local.",
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
80,
f"foo{i}.local.",
)
generated.add_answer_at_time(answer, 0)
assert len(generated.questions) == 35
assert len(generated.answers) == 35
packets = generated.packets()
assert len(packets) == 2
assert len(packets[0]) <= const._MAX_MSG_TYPICAL
assert len(packets[1]) <= const._MAX_MSG_TYPICAL
parsed1 = r.DNSIncoming(packets[0])
assert len(parsed1.questions) == 35
assert len(parsed1.answers()) == 33
parsed2 = r.DNSIncoming(packets[1])
assert len(parsed2.questions) == 0
assert len(parsed2.answers()) == 2
class PacketForm(unittest.TestCase):
def test_transaction_id(self):
"""ID must be zero in a DNS-SD packet"""
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
bytes = generated.packets()[0]
id = bytes[0] << 8 | bytes[1]
assert id == 0
def test_setting_id(self):
"""Test setting id in the constructor"""
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY, id_=4444)
assert generated.id == 4444
def test_query_header_bits(self):
generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
bytes = generated.packets()[0]
flags = bytes[2] << 8 | bytes[3]
assert flags == 0x0
def test_response_header_bits(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
bytes = generated.packets()[0]
flags = bytes[2] << 8 | bytes[3]
assert flags == 0x8000
def test_numbers(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
bytes = generated.packets()[0]
(num_questions, num_answers, num_authorities, num_additionals) = struct.unpack("!4H", bytes[4:12])
assert num_questions == 0
assert num_answers == 0
assert num_authorities == 0
assert num_additionals == 0
def test_numbers_questions(self):
generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
question = r.DNSQuestion("testname.local.", const._TYPE_SRV, const._CLASS_IN)
for _i in range(10):
generated.add_question(question)
bytes = generated.packets()[0]
(num_questions, num_answers, num_authorities, num_additionals) = struct.unpack("!4H", bytes[4:12])
assert num_questions == 10
assert num_answers == 0
assert num_authorities == 0
assert num_additionals == 0
class TestDnsIncoming(unittest.TestCase):
def test_incoming_exception_handling(self):
generated = r.DNSOutgoing(0)
packet = generated.packets()[0]
packet = packet[:8] + b"deadbeef" + packet[8:]
parsed = r.DNSIncoming(packet)
parsed = r.DNSIncoming(packet)
assert parsed.valid is False
def test_incoming_unknown_type(self):
generated = r.DNSOutgoing(0)
answer = r.DNSAddress("a", const._TYPE_SOA, const._CLASS_IN, 1, b"a")
generated.add_additional_answer(answer)
packet = generated.packets()[0]
parsed = r.DNSIncoming(packet)
assert len(parsed.answers()) == 0
assert parsed.is_query() != parsed.is_response()
def test_incoming_circular_reference(self):
assert not r.DNSIncoming(
bytes.fromhex(
"01005e0000fb542a1bf0577608004500006897934000ff11d81bc0a86a31e00000fb"
"14e914e90054f9b2000084000000000100000000095f7365727669636573075f646e"
"732d7364045f756470056c6f63616c00000c0001000011940018105f73706f746966"
"792d636f6e6e656374045f746370c023"
)
).valid
@unittest.skipIf(not has_working_ipv6(), "Requires IPv6")
@unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
def test_incoming_ipv6(self):
addr = "2606:2800:220:1:248:1893:25c8:1946" # example.com
packed = socket.inet_pton(socket.AF_INET6, addr)
generated = r.DNSOutgoing(0)
answer = r.DNSAddress("domain", const._TYPE_AAAA, const._CLASS_IN | const._CLASS_UNIQUE, 1, packed)
generated.add_additional_answer(answer)
packet = generated.packets()[0]
parsed = r.DNSIncoming(packet)
record = parsed.answers()[0]
assert isinstance(record, r.DNSAddress)
assert record.address == packed
def test_dns_compression_rollback_for_corruption():
"""Verify rolling back does not lead to dns compression corruption."""
out = r.DNSOutgoing(const._FLAGS_QR_RESPONSE | const._FLAGS_AA)
address = socket.inet_pton(socket.AF_INET, "192.168.208.5")
additionals = [
{
"name": "HASS Bridge ZJWH FF5137._hap._tcp.local.",
"address": address,
"port": 51832,
"text": b"\x13md=HASS Bridge"
b" ZJWH\x06pv=1.0\x14id=01:6B:30:FF:51:37\x05c#=12\x04s#=1\x04ff=0\x04"
b"ci=2\x04sf=0\x0bsh=L0m/aQ==",
},
{
"name": "HASS Bridge 3K9A C2582A._hap._tcp.local.",
"address": address,
"port": 51834,
"text": b"\x13md=HASS Bridge"
b" 3K9A\x06pv=1.0\x14id=E2:AA:5B:C2:58:2A\x05c#=12\x04s#=1\x04ff=0\x04"
b"ci=2\x04sf=0\x0bsh=b2CnzQ==",
},
{
"name": "Master Bed TV CEDB27._hap._tcp.local.",
"address": address,
"port": 51830,
"text": b"\x10md=Master Bed"
b" TV\x06pv=1.0\x14id=9E:B7:44:CE:DB:27\x05c#=18\x04s#=1\x04ff=0\x05"
b"ci=31\x04sf=0\x0bsh=CVj1kw==",
},
{
"name": "Living Room TV 921B77._hap._tcp.local.",
"address": address,
"port": 51833,
"text": b"\x11md=Living Room"
b" TV\x06pv=1.0\x14id=11:61:E7:92:1B:77\x05c#=17\x04s#=1\x04ff=0\x05"
b"ci=31\x04sf=0\x0bsh=qU77SQ==",
},
{
"name": "HASS Bridge ZC8X FF413D._hap._tcp.local.",
"address": address,
"port": 51829,
"text": b"\x13md=HASS Bridge"
b" ZC8X\x06pv=1.0\x14id=96:14:45:FF:41:3D\x05c#=12\x04s#=1\x04ff=0\x04"
b"ci=2\x04sf=0\x0bsh=b0QZlg==",
},
{
"name": "HASS Bridge WLTF 4BE61F._hap._tcp.local.",
"address": address,
"port": 51837,
"text": b"\x13md=HASS Bridge"
b" WLTF\x06pv=1.0\x14id=E0:E7:98:4B:E6:1F\x04c#=2\x04s#=1\x04ff=0\x04"
b"ci=2\x04sf=0\x0bsh=ahAISA==",
},
{
"name": "FrontdoorCamera 8941D1._hap._tcp.local.",
"address": address,
"port": 54898,
"text": b"\x12md=FrontdoorCamera\x06pv=1.0\x14id=9F:B7:DC:89:41:D1\x04c#=2\x04"
b"s#=1\x04ff=0\x04ci=2\x04sf=0\x0bsh=0+MXmA==",
},
{
"name": "HASS Bridge W9DN 5B5CC5._hap._tcp.local.",
"address": address,
"port": 51836,
"text": b"\x13md=HASS Bridge"
b" W9DN\x06pv=1.0\x14id=11:8E:DB:5B:5C:C5\x05c#=12\x04s#=1\x04ff=0\x04"
b"ci=2\x04sf=0\x0bsh=6fLM5A==",
},
{
"name": "HASS Bridge Y9OO EFF0A7._hap._tcp.local.",
"address": address,
"port": 51838,
"text": b"\x13md=HASS Bridge"
b" Y9OO\x06pv=1.0\x14id=D3:FE:98:EF:F0:A7\x04c#=2\x04s#=1\x04ff=0\x04"
b"ci=2\x04sf=0\x0bsh=u3bdfw==",
},
{
"name": "Snooze Room TV 6B89B0._hap._tcp.local.",
"address": address,
"port": 51835,
"text": b"\x11md=Snooze Room"
b" TV\x06pv=1.0\x14id=5F:D5:70:6B:89:B0\x05c#=17\x04s#=1\x04ff=0\x05"
b"ci=31\x04sf=0\x0bsh=xNTqsg==",
},
{
"name": "AlexanderHomeAssistant 74651D._hap._tcp.local.",
"address": address,
"port": 54811,
"text": b"\x19md=AlexanderHomeAssistant\x06pv=1.0\x14id=59:8A:0B:74:65:1D\x05"
b"c#=14\x04s#=1\x04ff=0\x04ci=2\x04sf=0\x0bsh=ccZLPA==",
},
{
"name": "HASS Bridge OS95 39C053._hap._tcp.local.",
"address": address,
"port": 51831,
"text": b"\x13md=HASS Bridge"
b" OS95\x06pv=1.0\x14id=7E:8C:E6:39:C0:53\x05c#=12\x04s#=1\x04ff=0\x04ci=2"
b"\x04sf=0\x0bsh=Xfe5LQ==",
},
]
out.add_answer_at_time(
DNSText(
"HASS Bridge W9DN 5B5CC5._hap._tcp.local.",
const._TYPE_TXT,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
b"\x13md=HASS Bridge W9DN\x06pv=1.0\x14id=11:8E:DB:5B:5C:C5\x05c#=12\x04s#=1"
b"\x04ff=0\x04ci=2\x04sf=0\x0bsh=6fLM5A==",
),
0,
)
for record in additionals:
out.add_additional_answer(
r.DNSService(
record["name"], # type: ignore
const._TYPE_SRV,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
0,
0,
record["port"], # type: ignore
record["name"], # type: ignore
)
)
out.add_additional_answer(
r.DNSText(
record["name"], # type: ignore
const._TYPE_TXT,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
record["text"], # type: ignore
)
)
out.add_additional_answer(
r.DNSAddress(
record["name"], # type: ignore
const._TYPE_A,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_HOST_TTL,
record["address"], # type: ignore
)
)
for packet in out.packets():
# Verify we can process the packets we created to
# ensure there is no corruption with the dns compression
incoming = r.DNSIncoming(packet)
assert incoming.valid is True
assert (
len(incoming.answers())
== incoming.num_answers + incoming.num_authorities + incoming.num_additionals
)
def test_tc_bit_in_query_packet():
"""Verify the TC bit is set when known answers exceed the packet size."""
out = r.DNSOutgoing(const._FLAGS_QR_QUERY | const._FLAGS_AA)
type_ = "_hap._tcp.local."
out.add_question(r.DNSQuestion(type_, const._TYPE_PTR, const._CLASS_IN))
for i in range(30):
out.add_answer_at_time(
DNSText(
f"HASS Bridge W9DN {i}._hap._tcp.local.",
const._TYPE_TXT,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
b"\x13md=HASS Bridge W9DN\x06pv=1.0\x14id=11:8E:DB:5B:5C:C5\x05c#=12\x04s#=1"
b"\x04ff=0\x04ci=2\x04sf=0\x0bsh=6fLM5A==",
),
0,
)
packets = out.packets()
assert len(packets) == 3
first_packet = r.DNSIncoming(packets[0])
assert first_packet.truncated
assert first_packet.valid is True
second_packet = r.DNSIncoming(packets[1])
assert second_packet.truncated
assert second_packet.valid is True
third_packet = r.DNSIncoming(packets[2])
assert not third_packet.truncated
assert third_packet.valid is True
def test_tc_bit_not_set_in_answer_packet():
"""Verify the TC bit is not set when there are no questions and answers exceed the packet size."""
out = r.DNSOutgoing(const._FLAGS_QR_RESPONSE | const._FLAGS_AA)
for i in range(30):
out.add_answer_at_time(
DNSText(
f"HASS Bridge W9DN {i}._hap._tcp.local.",
const._TYPE_TXT,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
b"\x13md=HASS Bridge W9DN\x06pv=1.0\x14id=11:8E:DB:5B:5C:C5\x05c#=12\x04s#=1"
b"\x04ff=0\x04ci=2\x04sf=0\x0bsh=6fLM5A==",
),
0,
)
packets = out.packets()
assert len(packets) == 3
first_packet = r.DNSIncoming(packets[0])
assert not first_packet.truncated
assert first_packet.valid is True
second_packet = r.DNSIncoming(packets[1])
assert not second_packet.truncated
assert second_packet.valid is True
third_packet = r.DNSIncoming(packets[2])
assert not third_packet.truncated
assert third_packet.valid is True
# MDNS 76 Standard query 0xffc4 PTR _raop._tcp.local, "QM" question
def test_qm_packet_parser():
"""Test we can parse a query packet with the QM bit."""
qm_packet = (
b"\xff\xc4\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x05_raop\x04_tcp\x05local\x00\x00\x0c\x00\x01"
)
parsed = DNSIncoming(qm_packet)
assert parsed.questions[0].unicast is False
assert ",QM," in str(parsed.questions[0])
# MDNS 115 Standard query 0x0000 PTR _companion-link._tcp.local, "QU" question OPT
def test_qu_packet_parser():
"""Test we can parse a query packet with the QU bit."""
qu_packet = (
b"\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x0f_companion-link\x04_tcp\x05local"
b"\x00\x00\x0c\x80\x01\x00\x00)\x05\xa0\x00\x00\x11\x94\x00\x12\x00\x04\x00\x0e\x00dz{\x8a6\x9czF\x84,\xcaQ\xff"
)
parsed = DNSIncoming(qu_packet)
assert parsed.questions[0].unicast is True
assert ",QU," in str(parsed.questions[0])
def test_parse_packet_with_nsec_record():
"""Test we can parse a packet with an NSEC record."""
nsec_packet = (
b"\x00\x00\x84\x00\x00\x00\x00\x01\x00\x00\x00\x03\x08_meshcop\x04_udp\x05local\x00\x00\x0c\x00"
b"\x01\x00\x00\x11\x94\x00\x0f\x0cMyHome54 (2)\xc0\x0c\xc0+\x00\x10\x80\x01\x00\x00\x11\x94\x00"
b")\x0bnn=MyHome54\x13xp=695034D148CC4784\x08tv=0.0.0\xc0+\x00!\x80\x01\x00\x00\x00x\x00\x15\x00"
b"\x00\x00\x00\xc0'\x0cMaster-Bed-2\xc0\x1a\xc0+\x00/\x80\x01\x00\x00\x11\x94\x00\t\xc0+\x00\x05"
b"\x00\x00\x80\x00@"
)
parsed = DNSIncoming(nsec_packet)
nsec_record = cast(r.DNSNsec, parsed.answers()[3])
assert "nsec," in str(nsec_record)
assert nsec_record.rdtypes == [16, 33]
assert nsec_record.next_name == "MyHome54 (2)._meshcop._udp.local."
def test_records_same_packet_share_fate():
"""Test records in the same packet all have the same created time."""
out = r.DNSOutgoing(const._FLAGS_QR_QUERY | const._FLAGS_AA)
type_ = "_hap._tcp.local."
out.add_question(r.DNSQuestion(type_, const._TYPE_PTR, const._CLASS_IN))
for i in range(30):
out.add_answer_at_time(
DNSText(
f"HASS Bridge W9DN {i}._hap._tcp.local.",
const._TYPE_TXT,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
b"\x13md=HASS Bridge W9DN\x06pv=1.0\x14id=11:8E:DB:5B:5C:C5\x05c#=12\x04s#=1"
b"\x04ff=0\x04ci=2\x04sf=0\x0bsh=6fLM5A==",
),
0,
)
for packet in out.packets():
dnsin = DNSIncoming(packet)
first_time = dnsin.answers()[0].created
for answer in dnsin.answers():
assert answer.created == first_time
def test_dns_compression_invalid_skips_bad_name_compress_in_question():
"""Test our wire parser can skip bad compression in questions."""
packet = (
b"\x00\x00\x00\x00\x00\x04\x00\x00\x00\x07\x00\x00\x11homeassistant1128\x05l"
b"ocal\x00\x00\xff\x00\x014homeassistant1128 [534a4794e5ed41879ecf012252d3e02"
b"a]\x0c_workstation\x04_tcp\xc0\x1e\x00\xff\x00\x014homeassistant1127 [534a47"
b"94e5ed41879ecf012252d3e02a]\xc0^\x00\xff\x00\x014homeassistant1123 [534a479"
b"4e5ed41879ecf012252d3e02a]\xc0^\x00\xff\x00\x014homeassistant1118 [534a4794"
b"e5ed41879ecf012252d3e02a]\xc0^\x00\xff\x00\x01\xc0\x0c\x00\x01\x80"
b"\x01\x00\x00\x00x\x00\x04\xc0\xa8<\xc3\xc0v\x00\x10\x80\x01\x00\x00\x00"
b"x\x00\x01\x00\xc0v\x00!\x80\x01\x00\x00\x00x\x00\x1f\x00\x00\x00\x00"
b"\x00\x00\x11homeassistant1127\x05local\x00\xc0\xb1\x00\x10\x80"
b"\x01\x00\x00\x00x\x00\x01\x00\xc0\xb1\x00!\x80\x01\x00\x00\x00x\x00\x1f"
b"\x00\x00\x00\x00\x00\x00\x11homeassistant1123\x05local\x00\xc0)\x00\x10\x80"
b"\x01\x00\x00\x00x\x00\x01\x00\xc0)\x00!\x80\x01\x00\x00\x00x\x00\x1f"
b"\x00\x00\x00\x00\x00\x00\x11homeassistant1128\x05local\x00"
)
parsed = r.DNSIncoming(packet)
assert len(parsed.questions) == 4
def test_dns_compression_all_invalid(caplog):
"""Test our wire parser can skip all invalid data."""
packet = (
b"\x00\x00\x84\x00\x00\x00\x00\x01\x00\x00\x00\x00!roborock-vacuum-s5e_miio416"
b"112328\x00\x00/\x80\x01\x00\x00\x00x\x00\t\xc0P\x00\x05@\x00\x00\x00\x00"
)
parsed = r.DNSIncoming(packet, ("2.4.5.4", 5353))
assert len(parsed.questions) == 0
assert len(parsed.answers()) == 0
assert " Unable to parse; skipping record" in caplog.text
def test_invalid_next_name_ignored():
"""Test our wire parser does not throw an an invalid next name.
The RFC states it should be ignored when used with mDNS.
"""
packet = (
b"\x00\x00\x00\x00\x00\x01\x00\x02\x00\x00\x00\x00\x07Android\x05local\x00\x00"
b"\xff\x00\x01\xc0\x0c\x00/\x00\x01\x00\x00\x00x\x00\x08\xc02\x00\x04@"
b"\x00\x00\x08\xc0\x0c\x00\x01\x00\x01\x00\x00\x00x\x00\x04\xc0\xa8X<"
)
parsed = r.DNSIncoming(packet)
assert len(parsed.questions) == 1
assert len(parsed.answers()) == 2
def test_dns_compression_invalid_skips_record():
"""Test our wire parser can skip records we do not know how to parse."""
packet = (
b"\x00\x00\x84\x00\x00\x00\x00\x06\x00\x00\x00\x00\x04_hap\x04_tcp\x05local\x00\x00\x0c"
b"\x00\x01\x00\x00\x11\x94\x00\x16\x13eufy HomeBase2-2464\xc0\x0c\x04Eufy\xc0\x16\x00/"
b"\x80\x01\x00\x00\x00x\x00\x08\xc0\xa6\x00\x04@\x00\x00\x08\xc0'\x00/\x80\x01\x00\x00"
b"\x11\x94\x00\t\xc0'\x00\x05\x00\x00\x80\x00@\xc0=\x00\x01\x80\x01\x00\x00\x00x\x00\x04"
b"\xc0\xa8Dp\xc0'\x00!\x80\x01\x00\x00\x00x\x00\x08\x00\x00\x00\x00\xd1_\xc0=\xc0'\x00"
b"\x10\x80\x01\x00\x00\x11\x94\x00K\x04c#=1\x04ff=2\x14id=38:71:4F:6B:76:00\x08md=T8010"
b"\x06pv=1.1\x05s#=75\x04sf=1\x04ci=2\x0bsh=xaQk4g=="
)
parsed = r.DNSIncoming(packet)
answer = r.DNSNsec(
"eufy HomeBase2-2464._hap._tcp.local.",
const._TYPE_NSEC,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"eufy HomeBase2-2464._hap._tcp.local.",
[const._TYPE_TXT, const._TYPE_SRV],
)
assert answer in parsed.answers()
def test_dns_compression_points_forward():
"""Test our wire parser can unpack nsec records with compression."""
packet = (
b"\x00\x00\x84\x00\x00\x00\x00\x07\x00\x00\x00\x00\x0eTV Beneden (2)"
b"\x10_androidtvremote\x04_tcp\x05local\x00\x00\x10\x80\x01\x00\x00\x11"
b"\x94\x00\x15\x14bt=D8:13:99:AC:98:F1\xc0\x0c\x00/\x80\x01\x00\x00\x11"
b"\x94\x00\t\xc0\x0c\x00\x05\x00\x00\x80\x00@\tAndroid-3\xc01\x00/\x80"
b"\x01\x00\x00\x00x\x00\x08\xc0\x9c\x00\x04@\x00\x00\x08\xc0l\x00\x01\x80"
b"\x01\x00\x00\x00x\x00\x04\xc0\xa8X\x0f\xc0\x0c\x00!\x80\x01\x00\x00\x00"
b"x\x00\x08\x00\x00\x00\x00\x19B\xc0l\xc0\x1b\x00\x0c\x00\x01\x00\x00\x11"
b"\x94\x00\x02\xc0\x0c\t_services\x07_dns-sd\x04_udp\xc01\x00\x0c\x00\x01"
b"\x00\x00\x11\x94\x00\x02\xc0\x1b"
)
parsed = r.DNSIncoming(packet)
answer = r.DNSNsec(
"TV Beneden (2)._androidtvremote._tcp.local.",
const._TYPE_NSEC,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
"TV Beneden (2)._androidtvremote._tcp.local.",
[const._TYPE_TXT, const._TYPE_SRV],
)
assert answer in parsed.answers()
def test_dns_compression_points_to_itself():
"""Test our wire parser does not loop forever when a compression pointer points to itself."""
packet = (
b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x06domain\x05local\x00\x00\x01"
b"\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05\xc0(\x00\x01\x80\x01\x00\x00\x00"
b"\x01\x00\x04\xc0\xa8\xd0\x06"
)
parsed = r.DNSIncoming(packet)
assert len(parsed.answers()) == 1
def test_dns_compression_points_beyond_packet():
"""Test our wire parser does not fail when the compression pointer points beyond the packet."""
packet = (
b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x06domain\x05local\x00\x00\x01"
b"\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05\xe7\x0f\x00\x01\x80\x01\x00\x00"
b"\x00\x01\x00\x04\xc0\xa8\xd0\x06"
)
parsed = r.DNSIncoming(packet)
assert len(parsed.answers()) == 1
def test_dns_compression_generic_failure(caplog):
"""Test our wire parser does not loop forever when dns compression is corrupt."""
packet = (
b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x06domain\x05local\x00\x00\x01"
b"\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05-\x0c\x00\x01\x80\x01\x00\x00"
b"\x00\x01\x00\x04\xc0\xa8\xd0\x06"
)
parsed = r.DNSIncoming(packet, ("1.2.3.4", 5353))
assert len(parsed.answers()) == 1
assert "Received invalid packet from ('1.2.3.4', 5353)" in caplog.text
def test_label_length_attack():
"""Test our wire parser does not loop forever when the name exceeds 253 chars."""
packet = (
b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d"
b"\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x01d\x00\x00\x01\x80"
b"\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05\xc0\x0c\x00\x01\x80\x01\x00\x00\x00"
b"\x01\x00\x04\xc0\xa8\xd0\x06"
)
parsed = r.DNSIncoming(packet)
assert len(parsed.answers()) == 0
def test_label_compression_attack():
"""Test our wire parser does not loop forever when exceeding the maximum number of labels."""
packet = (
b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x03atk\x00\x00\x01\x80"
b"\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
b"atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03atk\x03"
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