File: test_protocol.py

package info (click to toggle)
python-zeroconf 0.147.0-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 1,380 kB
  • sloc: python: 15,356; makefile: 23
file content (1083 lines) | stat: -rw-r--r-- 44,307 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
"""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,
            int(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"
        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\xc0"
        b"\x0c\x00\x01\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x06"
    )
    parsed = r.DNSIncoming(packet)
    assert len(parsed.answers()) == 1


def test_dns_compression_loop_attack():
    """Test our wire parser does not loop forever when dns compression is in a loop."""
    packet = (
        b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\x03atk\x03dns\x05loc"
        b"al\xc0\x10\x00\x01\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05\x04a"
        b"tk2\x04dns2\xc0\x14\x00\x01\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0\x05"
        b"\x04atk3\xc0\x10\x00\x01\x80\x01\x00\x00\x00\x01\x00\x04\xc0\xa8\xd0"
        b"\x05\x04atk4\x04dns5\xc0\x14\x00\x01\x80\x01\x00\x00\x00\x01\x00\x04\xc0"
        b"\xa8\xd0\x05\x04atk5\x04dns2\xc0^\x00\x01\x80\x01\x00\x00\x00\x01\x00"
        b"\x04\xc0\xa8\xd0\x05\xc0s\x00\x01\x80\x01\x00\x00\x00\x01\x00"
        b"\x04\xc0\xa8\xd0\x05\xc0s\x00\x01\x80\x01\x00\x00\x00\x01\x00"
        b"\x04\xc0\xa8\xd0\x05"
    )
    parsed = r.DNSIncoming(packet)
    assert len(parsed.answers()) == 0


def test_txt_after_invalid_nsec_name_still_usable():
    """Test that we can see the txt record after the invalid nsec record."""
    packet = (
        b"\x00\x00\x84\x00\x00\x00\x00\x06\x00\x00\x00\x00\x06_sonos\x04_tcp\x05loc"
        b"al\x00\x00\x0c\x00\x01\x00\x00\x11\x94\x00\x15\x12Sonos-542A1BC9220E"
        b"\xc0\x0c\x12Sonos-542A1BC9220E\xc0\x18\x00/\x80\x01\x00\x00\x00x\x00"
        b"\x08\xc1t\x00\x04@\x00\x00\x08\xc0)\x00/\x80\x01\x00\x00\x11\x94\x00"
        b"\t\xc0)\x00\x05\x00\x00\x80\x00@\xc0)\x00!\x80\x01\x00\x00\x00x"
        b"\x00\x08\x00\x00\x00\x00\x05\xa3\xc0>\xc0>\x00\x01\x80\x01\x00\x00\x00x"
        b"\x00\x04\xc0\xa8\x02:\xc0)\x00\x10\x80\x01\x00\x00\x11\x94\x01*2info=/api"
        b"/v1/players/RINCON_542A1BC9220E01400/info\x06vers=3\x10protovers=1.24.1\nbo"
        b"otseq=11%hhid=Sonos_rYn9K9DLXJe0f3LP9747lbvFvh;mhhid=Sonos_rYn9K9DLXJe0f3LP9"
        b"747lbvFvh.Q45RuMaeC07rfXh7OJGm<location=http://192.168.2.58:1400/xml/device_"
        b"description.xml\x0csslport=1443\x0ehhsslport=1843\tvariant=2\x0emdnssequen"
        b"ce=0"
    )
    parsed = r.DNSIncoming(packet)
    txt_record = cast(r.DNSText, parsed.answers()[4])
    # The NSEC record with the invalid name compression should be skipped
    assert txt_record.text == (
        b"2info=/api/v1/players/RINCON_542A1BC9220E01400/info\x06vers=3\x10protovers"
        b"=1.24.1\nbootseq=11%hhid=Sonos_rYn9K9DLXJe0f3LP9747lbvFvh;mhhid=Sonos_rYn"
        b"9K9DLXJe0f3LP9747lbvFvh.Q45RuMaeC07rfXh7OJGm<location=http://192.168.2.58:14"
        b"00/xml/device_description.xml\x0csslport=1443\x0ehhsslport=1843\tvarian"
        b"t=2\x0emdnssequence=0"
    )
    assert len(parsed.answers()) == 5


def test_parse_matter_packet():
    """Test our wire parser can handle a packet from matter."""
    packet_hex = (
        "000084000000000a00000000075f6d6174746572045f746370056c6f63"
        "616c00000c000100001194002421413336303441463533314638364442"
        "372d30303030303030303030303030303636c00cc00c000c0001000011"
        "94002421333346353633363743453244333646302d3030303030303030"
        "3444423341334541c00cc00c000c000100001194002421414531313941"
        "304130374145304632302d34383742343631363639333638413332c00c"
        "c00c000c00010000119400242141333630344146353331463836444237"
        "2d30303030303030303030303030303237c00cc00c000c000100001194"
        "002421413336303441463533314638364442372d303030303030303030"
        "30303030303637c00cc00c000c00010000119400242133334635363336"
        "3743453244333646302d30303030303030304243363637324136c00cc0"
        "0c000c000100001194002421414531313941304130374145304632302d"
        "39464534383646413645373730464433c00cc00c000c00010000119400"
        "2421413336303441463533314638364442372d30303030303030303030"
        "303030303434c00cc00c000c0001000011940024213935374431413839"
        "44463239343033312d41423337393041444346434231423239c00cc00c"
        "000c000100001194002421413336303441463533314638364442372d30"
        "303030303030303030303030303638c00c"
    )
    parsed = r.DNSIncoming(bytes.fromhex(packet_hex))
    assert len(parsed.answers()) == 10