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"""Unit tests for zeroconf._dns."""
from __future__ import annotations
import logging
import os
import socket
import unittest.mock
import pytest
import zeroconf as r
from zeroconf import DNSHinfo, DNSText, ServiceInfo, const, current_time_millis
from zeroconf._dns import DNSRRSet
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 TestDunder(unittest.TestCase):
def test_dns_text_repr(self):
# There was an issue on Python 3 that prevented DNSText's repr
# from working when the text was longer than 10 bytes
text = DNSText("irrelevant", 0, 0, 0, b"12345678901")
repr(text)
text = DNSText("irrelevant", 0, 0, 0, b"123")
repr(text)
def test_dns_hinfo_repr_eq(self):
hinfo = DNSHinfo("irrelevant", const._TYPE_HINFO, 0, 0, "cpu", "os")
assert hinfo == hinfo
repr(hinfo)
def test_dns_pointer_repr(self):
pointer = r.DNSPointer("irrelevant", const._TYPE_PTR, const._CLASS_IN, const._DNS_OTHER_TTL, "123")
repr(pointer)
@unittest.skipIf(not has_working_ipv6(), "Requires IPv6")
@unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
def test_dns_address_repr(self):
address = r.DNSAddress("irrelevant", const._TYPE_SOA, const._CLASS_IN, 1, b"a")
assert repr(address).endswith("b'a'")
address_ipv4 = r.DNSAddress(
"irrelevant",
const._TYPE_SOA,
const._CLASS_IN,
1,
socket.inet_pton(socket.AF_INET, "127.0.0.1"),
)
assert repr(address_ipv4).endswith("127.0.0.1")
address_ipv6 = r.DNSAddress(
"irrelevant",
const._TYPE_SOA,
const._CLASS_IN,
1,
socket.inet_pton(socket.AF_INET6, "::1"),
)
assert repr(address_ipv6).endswith("::1")
def test_dns_question_repr(self):
question = r.DNSQuestion("irrelevant", const._TYPE_SRV, const._CLASS_IN | const._CLASS_UNIQUE)
repr(question)
assert not question != question
def test_dns_service_repr(self):
service = r.DNSService(
"irrelevant",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
80,
"a",
)
repr(service)
def test_dns_record_abc(self):
record = r.DNSRecord("irrelevant", const._TYPE_SRV, const._CLASS_IN, const._DNS_HOST_TTL)
self.assertRaises(r.AbstractMethodException, record.__eq__, record)
with pytest.raises((r.AbstractMethodException, TypeError)):
record.write(None) # type: ignore[arg-type]
def test_service_info_dunder(self):
type_ = "_test-srvc-type._tcp.local."
name = "xxxyyy"
registration_name = f"{name}.{type_}"
info = ServiceInfo(
type_,
registration_name,
80,
0,
0,
b"",
"ash-2.local.",
addresses=[socket.inet_aton("10.0.1.2")],
)
assert not info != info
repr(info)
def test_service_info_text_properties_not_given(self):
type_ = "_test-srvc-type._tcp.local."
name = "xxxyyy"
registration_name = f"{name}.{type_}"
info = ServiceInfo(
type_=type_,
name=registration_name,
addresses=[socket.inet_aton("10.0.1.2")],
port=80,
server="ash-2.local.",
)
assert isinstance(info.text, bytes)
repr(info)
def test_dns_outgoing_repr(self):
dns_outgoing = r.DNSOutgoing(const._FLAGS_QR_QUERY)
repr(dns_outgoing)
def test_dns_record_is_expired(self):
record = r.DNSRecord("irrelevant", const._TYPE_SRV, const._CLASS_IN, 8)
now = current_time_millis()
assert record.is_expired(now) is False
assert record.is_expired(now + (8 / 2 * 1000)) is False
assert record.is_expired(now + (8 * 1000)) is True
def test_dns_record_is_stale(self):
record = r.DNSRecord("irrelevant", const._TYPE_SRV, const._CLASS_IN, 8)
now = current_time_millis()
assert record.is_stale(now) is False
assert record.is_stale(now + (8 / 4.1 * 1000)) is False
assert record.is_stale(now + (8 / 1.9 * 1000)) is True
assert record.is_stale(now + (8 * 1000)) is True
def test_dns_record_is_recent(self):
now = current_time_millis()
record = r.DNSRecord("irrelevant", const._TYPE_SRV, const._CLASS_IN, 8)
assert record.is_recent(now + (8 / 4.2 * 1000)) is True
assert record.is_recent(now + (8 / 3 * 1000)) is False
assert record.is_recent(now + (8 / 2 * 1000)) is False
assert record.is_recent(now + (8 * 1000)) is False
def test_dns_question_hashablity():
"""Test DNSQuestions are hashable."""
record1 = r.DNSQuestion("irrelevant", const._TYPE_A, const._CLASS_IN)
record2 = r.DNSQuestion("irrelevant", const._TYPE_A, const._CLASS_IN)
record_set = {record1, record2}
assert len(record_set) == 1
record_set.add(record1)
assert len(record_set) == 1
record3_dupe = r.DNSQuestion("irrelevant", const._TYPE_A, const._CLASS_IN)
assert record2 == record3_dupe
assert record2.__hash__() == record3_dupe.__hash__()
record_set.add(record3_dupe)
assert len(record_set) == 1
record4_dupe = r.DNSQuestion("notsame", const._TYPE_A, const._CLASS_IN)
assert record2 != record4_dupe
assert record2.__hash__() != record4_dupe.__hash__()
record_set.add(record4_dupe)
assert len(record_set) == 2
def test_dns_record_hashablity_does_not_consider_ttl():
"""Test DNSRecord are hashable."""
# Verify the TTL is not considered in the hash
record1 = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, const._DNS_OTHER_TTL, b"same")
record2 = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, const._DNS_HOST_TTL, b"same")
record_set = {record1, record2}
assert len(record_set) == 1
record_set.add(record1)
assert len(record_set) == 1
record3_dupe = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, const._DNS_HOST_TTL, b"same")
assert record2 == record3_dupe
assert record2.__hash__() == record3_dupe.__hash__()
record_set.add(record3_dupe)
assert len(record_set) == 1
def test_dns_record_hashablity_does_not_consider_created():
"""Test DNSRecord are hashable and created is not considered."""
# Verify the TTL is not considered in the hash
record1 = r.DNSAddress(
"irrelevant", const._TYPE_A, const._CLASS_IN, const._DNS_HOST_TTL, b"same", created=1.0
)
record2 = r.DNSAddress(
"irrelevant", const._TYPE_A, const._CLASS_IN, const._DNS_HOST_TTL, b"same", created=2.0
)
record_set = {record1, record2}
assert len(record_set) == 1
record_set.add(record1)
assert len(record_set) == 1
record3_dupe = r.DNSAddress(
"irrelevant", const._TYPE_A, const._CLASS_IN, const._DNS_HOST_TTL, b"same", created=3.0
)
assert record2 == record3_dupe
assert record2.__hash__() == record3_dupe.__hash__()
record_set.add(record3_dupe)
assert len(record_set) == 1
def test_dns_record_hashablity_does_not_consider_unique():
"""Test DNSRecord are hashable and unique is ignored."""
# Verify the unique value is not considered in the hash
record1 = r.DNSAddress(
"irrelevant",
const._TYPE_A,
const._CLASS_IN | const._CLASS_UNIQUE,
const._DNS_OTHER_TTL,
b"same",
)
record2 = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, const._DNS_OTHER_TTL, b"same")
assert record1.class_ == record2.class_
assert record1.__hash__() == record2.__hash__()
record_set = {record1, record2}
assert len(record_set) == 1
def test_dns_address_record_hashablity():
"""Test DNSAddress are hashable."""
address1 = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 1, b"a")
address2 = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 1, b"b")
address3 = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 1, b"c")
address4 = r.DNSAddress("irrelevant", const._TYPE_AAAA, const._CLASS_IN, 1, b"c")
record_set = {address1, address2, address3, address4}
assert len(record_set) == 4
record_set.add(address1)
assert len(record_set) == 4
address3_dupe = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 1, b"c")
record_set.add(address3_dupe)
assert len(record_set) == 4
# Verify we can remove records
additional_set = {address1, address2}
record_set -= additional_set
assert record_set == {address3, address4}
def test_dns_hinfo_record_hashablity():
"""Test DNSHinfo are hashable."""
hinfo1 = r.DNSHinfo("irrelevant", const._TYPE_HINFO, 0, 0, "cpu1", "os")
hinfo2 = r.DNSHinfo("irrelevant", const._TYPE_HINFO, 0, 0, "cpu2", "os")
record_set = {hinfo1, hinfo2}
assert len(record_set) == 2
record_set.add(hinfo1)
assert len(record_set) == 2
hinfo2_dupe = r.DNSHinfo("irrelevant", const._TYPE_HINFO, 0, 0, "cpu2", "os")
assert hinfo2 == hinfo2_dupe
assert hinfo2.__hash__() == hinfo2_dupe.__hash__()
record_set.add(hinfo2_dupe)
assert len(record_set) == 2
def test_dns_pointer_record_hashablity():
"""Test DNSPointer are hashable."""
ptr1 = r.DNSPointer("irrelevant", const._TYPE_PTR, const._CLASS_IN, const._DNS_OTHER_TTL, "123")
ptr2 = r.DNSPointer("irrelevant", const._TYPE_PTR, const._CLASS_IN, const._DNS_OTHER_TTL, "456")
record_set = {ptr1, ptr2}
assert len(record_set) == 2
record_set.add(ptr1)
assert len(record_set) == 2
ptr2_dupe = r.DNSPointer("irrelevant", const._TYPE_PTR, const._CLASS_IN, const._DNS_OTHER_TTL, "456")
assert ptr2 == ptr2
assert ptr2.__hash__() == ptr2_dupe.__hash__()
record_set.add(ptr2_dupe)
assert len(record_set) == 2
def test_dns_pointer_comparison_is_case_insensitive():
"""Test DNSPointer comparison is case insensitive."""
ptr1 = r.DNSPointer("irrelevant", const._TYPE_PTR, const._CLASS_IN, const._DNS_OTHER_TTL, "123")
ptr2 = r.DNSPointer(
"irrelevant".upper(),
const._TYPE_PTR,
const._CLASS_IN,
const._DNS_OTHER_TTL,
"123",
)
assert ptr1 == ptr2
def test_dns_text_record_hashablity():
"""Test DNSText are hashable."""
text1 = r.DNSText("irrelevant", 0, 0, const._DNS_OTHER_TTL, b"12345678901")
text2 = r.DNSText("irrelevant", 1, 0, const._DNS_OTHER_TTL, b"12345678901")
text3 = r.DNSText("irrelevant", 0, 1, const._DNS_OTHER_TTL, b"12345678901")
text4 = r.DNSText("irrelevant", 0, 0, const._DNS_OTHER_TTL, b"ABCDEFGHIJK")
record_set = {text1, text2, text3, text4}
assert len(record_set) == 4
record_set.add(text1)
assert len(record_set) == 4
text1_dupe = r.DNSText("irrelevant", 0, 0, const._DNS_OTHER_TTL, b"12345678901")
assert text1 == text1_dupe
assert text1.__hash__() == text1_dupe.__hash__()
record_set.add(text1_dupe)
assert len(record_set) == 4
def test_dns_service_record_hashablity():
"""Test DNSService are hashable."""
srv1 = r.DNSService(
"irrelevant",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
80,
"a",
)
srv2 = r.DNSService(
"irrelevant",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
1,
80,
"a",
)
srv3 = r.DNSService(
"irrelevant",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
81,
"a",
)
srv4 = r.DNSService(
"irrelevant",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
80,
"ab",
)
record_set = {srv1, srv2, srv3, srv4}
assert len(record_set) == 4
record_set.add(srv1)
assert len(record_set) == 4
srv1_dupe = r.DNSService(
"irrelevant",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
80,
"a",
)
assert srv1 == srv1_dupe
assert srv1.__hash__() == srv1_dupe.__hash__()
record_set.add(srv1_dupe)
assert len(record_set) == 4
def test_dns_service_server_key():
"""Test DNSService server_key is lowercase."""
srv1 = r.DNSService(
"X._tcp._http.local.",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
80,
"X.local.",
)
assert srv1.name == "X._tcp._http.local."
assert srv1.key == "x._tcp._http.local."
assert srv1.server == "X.local."
assert srv1.server_key == "x.local."
def test_dns_service_server_comparison_is_case_insensitive():
"""Test DNSService server comparison is case insensitive."""
srv1 = r.DNSService(
"X._tcp._http.local.",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
80,
"X.local.",
)
srv2 = r.DNSService(
"X._tcp._http.local.",
const._TYPE_SRV,
const._CLASS_IN,
const._DNS_HOST_TTL,
0,
0,
80,
"x.local.",
)
assert srv1 == srv2
def test_dns_nsec_record_hashablity():
"""Test DNSNsec are hashable."""
nsec1 = r.DNSNsec(
"irrelevant",
const._TYPE_PTR,
const._CLASS_IN,
const._DNS_OTHER_TTL,
"irrelevant",
[1, 2, 3],
)
nsec2 = r.DNSNsec(
"irrelevant",
const._TYPE_PTR,
const._CLASS_IN,
const._DNS_OTHER_TTL,
"irrelevant",
[1, 2],
)
record_set = {nsec1, nsec2}
assert len(record_set) == 2
record_set.add(nsec1)
assert len(record_set) == 2
nsec2_dupe = r.DNSNsec(
"irrelevant",
const._TYPE_PTR,
const._CLASS_IN,
const._DNS_OTHER_TTL,
"irrelevant",
[1, 2],
)
assert nsec2 == nsec2_dupe
assert nsec2.__hash__() == nsec2_dupe.__hash__()
record_set.add(nsec2_dupe)
assert len(record_set) == 2
def test_rrset_does_not_consider_ttl():
"""Test DNSRRSet does not consider the ttl in the hash."""
longarec = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 100, b"same")
shortarec = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 10, b"same")
longaaaarec = r.DNSAddress("irrelevant", const._TYPE_AAAA, const._CLASS_IN, 100, b"same")
shortaaaarec = r.DNSAddress("irrelevant", const._TYPE_AAAA, const._CLASS_IN, 10, b"same")
rrset = DNSRRSet([longarec, shortaaaarec])
assert rrset.suppresses(longarec)
assert rrset.suppresses(shortarec)
assert not rrset.suppresses(longaaaarec)
assert rrset.suppresses(shortaaaarec)
verylongarec = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 1000, b"same")
longarec = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 100, b"same")
mediumarec = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 60, b"same")
shortarec = r.DNSAddress("irrelevant", const._TYPE_A, const._CLASS_IN, 10, b"same")
rrset2 = DNSRRSet([mediumarec])
assert not rrset2.suppresses(verylongarec)
assert rrset2.suppresses(longarec)
assert rrset2.suppresses(mediumarec)
assert rrset2.suppresses(shortarec)
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