forked from bitcoin/bitcoin
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathaddrman_tests.cpp
1053 lines (837 loc) · 38.6 KB
/
addrman_tests.cpp
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
// Copyright (c) 2012-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <addrdb.h>
#include <addrman.h>
#include <addrman_impl.h>
#include <chainparams.h>
#include <clientversion.h>
#include <hash.h>
#include <netbase.h>
#include <random.h>
#include <test/data/asmap.raw.h>
#include <test/util/setup_common.h>
#include <util/asmap.h>
#include <util/string.h>
#include <boost/test/unit_test.hpp>
#include <optional>
#include <string>
using namespace std::literals;
class AddrManTest : public AddrMan
{
public:
explicit AddrManTest(std::vector<bool> asmap = std::vector<bool>())
: AddrMan(asmap, /*deterministic=*/true, /*consistency_check_ratio=*/100)
{}
AddrInfo* Find(const CService& addr)
{
LOCK(m_impl->cs);
return m_impl->Find(addr);
}
AddrInfo* Create(const CAddress& addr, const CNetAddr& addrSource, int* pnId)
{
LOCK(m_impl->cs);
return m_impl->Create(addr, addrSource, pnId);
}
void Delete(int nId)
{
LOCK(m_impl->cs);
m_impl->Delete(nId);
}
// Used to test deserialization
std::pair<int, int> GetBucketAndEntry(const CAddress& addr)
{
LOCK(m_impl->cs);
int nId = m_impl->mapAddr[addr];
for (int bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; ++bucket) {
for (int entry = 0; entry < ADDRMAN_BUCKET_SIZE; ++entry) {
if (nId == m_impl->vvNew[bucket][entry]) {
return std::pair<int, int>(bucket, entry);
}
}
}
return std::pair<int, int>(-1, -1);
}
// Simulates connection failure so that we can test eviction of offline nodes
void SimConnFail(const CService& addr)
{
int64_t nLastSuccess = 1;
// Set last good connection in the deep past.
Good(addr, nLastSuccess);
bool count_failure = false;
int64_t nLastTry = GetAdjustedTime() - 61;
Attempt(addr, count_failure, nLastTry);
}
};
static CNetAddr ResolveIP(const std::string& ip)
{
CNetAddr addr;
BOOST_CHECK_MESSAGE(LookupHost(ip, addr, false), strprintf("failed to resolve: %s", ip));
return addr;
}
static CService ResolveService(const std::string& ip, uint16_t port = 0)
{
CService serv;
BOOST_CHECK_MESSAGE(Lookup(ip, serv, port, false), strprintf("failed to resolve: %s:%i", ip, port));
return serv;
}
static std::vector<bool> FromBytes(const unsigned char* source, int vector_size)
{
std::vector<bool> result(vector_size);
for (int byte_i = 0; byte_i < vector_size / 8; ++byte_i) {
unsigned char cur_byte = source[byte_i];
for (int bit_i = 0; bit_i < 8; ++bit_i) {
result[byte_i * 8 + bit_i] = (cur_byte >> bit_i) & 1;
}
}
return result;
}
BOOST_FIXTURE_TEST_SUITE(addrman_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(addrman_simple)
{
auto addrman = std::make_unique<AddrManTest>();
CNetAddr source = ResolveIP("252.2.2.2");
// Test: Does Addrman respond correctly when empty.
BOOST_CHECK_EQUAL(addrman->size(), 0U);
auto addr_null = addrman->Select().first;
BOOST_CHECK_EQUAL(addr_null.ToString(), "[::]:0");
// Test: Does Addrman::Add work as expected.
CService addr1 = ResolveService("250.1.1.1", 8333);
BOOST_CHECK(addrman->Add({CAddress(addr1, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman->size(), 1U);
auto addr_ret1 = addrman->Select().first;
BOOST_CHECK_EQUAL(addr_ret1.ToString(), "250.1.1.1:8333");
// Test: Does IP address deduplication work correctly.
// Expected dup IP should not be added.
CService addr1_dup = ResolveService("250.1.1.1", 8333);
BOOST_CHECK(!addrman->Add({CAddress(addr1_dup, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman->size(), 1U);
// Test: New table has one addr and we add a diff addr we should
// have at least one addr.
// Note that addrman's size cannot be tested reliably after insertion, as
// hash collisions may occur. But we can always be sure of at least one
// success.
CService addr2 = ResolveService("250.1.1.2", 8333);
BOOST_CHECK(addrman->Add({CAddress(addr2, NODE_NONE)}, source));
BOOST_CHECK(addrman->size() >= 1);
// Test: reset addrman and test AddrMan::Add multiple addresses works as expected
addrman = std::make_unique<AddrManTest>();
std::vector<CAddress> vAddr;
vAddr.push_back(CAddress(ResolveService("250.1.1.3", 8333), NODE_NONE));
vAddr.push_back(CAddress(ResolveService("250.1.1.4", 8333), NODE_NONE));
BOOST_CHECK(addrman->Add(vAddr, source));
BOOST_CHECK(addrman->size() >= 1);
}
BOOST_AUTO_TEST_CASE(addrman_ports)
{
AddrManTest addrman;
CNetAddr source = ResolveIP("252.2.2.2");
BOOST_CHECK_EQUAL(addrman.size(), 0U);
// Test 7; Addr with same IP but diff port does not replace existing addr.
CService addr1 = ResolveService("250.1.1.1", 8333);
BOOST_CHECK(addrman.Add({CAddress(addr1, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman.size(), 1U);
CService addr1_port = ResolveService("250.1.1.1", 8334);
BOOST_CHECK(addrman.Add({CAddress(addr1_port, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman.size(), 2U);
auto addr_ret2 = addrman.Select().first;
BOOST_CHECK(addr_ret2.ToString() == "250.1.1.1:8333" || addr_ret2.ToString() == "250.1.1.1:8334");
// Test: Add same IP but diff port to tried table; this converts the entry with
// the specified port to tried, but not the other.
addrman.Good(CAddress(addr1_port, NODE_NONE));
BOOST_CHECK_EQUAL(addrman.size(), 2U);
bool newOnly = true;
auto addr_ret3 = addrman.Select(newOnly).first;
BOOST_CHECK_EQUAL(addr_ret3.ToString(), "250.1.1.1:8333");
}
BOOST_AUTO_TEST_CASE(addrman_select)
{
AddrManTest addrman;
CNetAddr source = ResolveIP("252.2.2.2");
// Test: Select from new with 1 addr in new.
CService addr1 = ResolveService("250.1.1.1", 8333);
BOOST_CHECK(addrman.Add({CAddress(addr1, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman.size(), 1U);
bool newOnly = true;
auto addr_ret1 = addrman.Select(newOnly).first;
BOOST_CHECK_EQUAL(addr_ret1.ToString(), "250.1.1.1:8333");
// Test: move addr to tried, select from new expected nothing returned.
addrman.Good(CAddress(addr1, NODE_NONE));
BOOST_CHECK_EQUAL(addrman.size(), 1U);
auto addr_ret2 = addrman.Select(newOnly).first;
BOOST_CHECK_EQUAL(addr_ret2.ToString(), "[::]:0");
auto addr_ret3 = addrman.Select().first;
BOOST_CHECK_EQUAL(addr_ret3.ToString(), "250.1.1.1:8333");
BOOST_CHECK_EQUAL(addrman.size(), 1U);
// Add three addresses to new table.
CService addr2 = ResolveService("250.3.1.1", 8333);
CService addr3 = ResolveService("250.3.2.2", 9999);
CService addr4 = ResolveService("250.3.3.3", 9999);
BOOST_CHECK(addrman.Add({CAddress(addr2, NODE_NONE)}, ResolveService("250.3.1.1", 8333)));
BOOST_CHECK(addrman.Add({CAddress(addr3, NODE_NONE)}, ResolveService("250.3.1.1", 8333)));
BOOST_CHECK(addrman.Add({CAddress(addr4, NODE_NONE)}, ResolveService("250.4.1.1", 8333)));
// Add three addresses to tried table.
CService addr5 = ResolveService("250.4.4.4", 8333);
CService addr6 = ResolveService("250.4.5.5", 7777);
CService addr7 = ResolveService("250.4.6.6", 8333);
BOOST_CHECK(addrman.Add({CAddress(addr5, NODE_NONE)}, ResolveService("250.3.1.1", 8333)));
addrman.Good(CAddress(addr5, NODE_NONE));
BOOST_CHECK(addrman.Add({CAddress(addr6, NODE_NONE)}, ResolveService("250.3.1.1", 8333)));
addrman.Good(CAddress(addr6, NODE_NONE));
BOOST_CHECK(addrman.Add({CAddress(addr7, NODE_NONE)}, ResolveService("250.1.1.3", 8333)));
addrman.Good(CAddress(addr7, NODE_NONE));
// Test: 6 addrs + 1 addr from last test = 7.
BOOST_CHECK_EQUAL(addrman.size(), 7U);
// Test: Select pulls from new and tried regardless of port number.
std::set<uint16_t> ports;
for (int i = 0; i < 20; ++i) {
ports.insert(addrman.Select().first.GetPort());
}
BOOST_CHECK_EQUAL(ports.size(), 3U);
}
BOOST_AUTO_TEST_CASE(addrman_new_collisions)
{
AddrManTest addrman;
CNetAddr source = ResolveIP("252.2.2.2");
uint32_t num_addrs{0};
BOOST_CHECK_EQUAL(addrman.size(), num_addrs);
while (num_addrs < 22) { // Magic number! 250.1.1.1 - 250.1.1.22 do not collide with deterministic key = 1
CService addr = ResolveService("250.1.1." + ToString(++num_addrs));
BOOST_CHECK(addrman.Add({CAddress(addr, NODE_NONE)}, source));
// Test: No collision in new table yet.
BOOST_CHECK_EQUAL(addrman.size(), num_addrs);
}
// Test: new table collision!
CService addr1 = ResolveService("250.1.1." + ToString(++num_addrs));
uint32_t collisions{1};
BOOST_CHECK(addrman.Add({CAddress(addr1, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman.size(), num_addrs - collisions);
CService addr2 = ResolveService("250.1.1." + ToString(++num_addrs));
BOOST_CHECK(addrman.Add({CAddress(addr2, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman.size(), num_addrs - collisions);
}
BOOST_AUTO_TEST_CASE(addrman_tried_collisions)
{
AddrManTest addrman;
CNetAddr source = ResolveIP("252.2.2.2");
uint32_t num_addrs{0};
BOOST_CHECK_EQUAL(addrman.size(), num_addrs);
while (num_addrs < 64) { // Magic number! 250.1.1.1 - 250.1.1.64 do not collide with deterministic key = 1
CService addr = ResolveService("250.1.1." + ToString(++num_addrs));
BOOST_CHECK(addrman.Add({CAddress(addr, NODE_NONE)}, source));
addrman.Good(CAddress(addr, NODE_NONE));
// Test: No collision in tried table yet.
BOOST_CHECK_EQUAL(addrman.size(), num_addrs);
}
// Test: tried table collision!
CService addr1 = ResolveService("250.1.1." + ToString(++num_addrs));
uint32_t collisions{1};
BOOST_CHECK(!addrman.Add({CAddress(addr1, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman.size(), num_addrs - collisions);
CService addr2 = ResolveService("250.1.1." + ToString(++num_addrs));
BOOST_CHECK(addrman.Add({CAddress(addr2, NODE_NONE)}, source));
BOOST_CHECK_EQUAL(addrman.size(), num_addrs - collisions);
}
BOOST_AUTO_TEST_CASE(addrman_find)
{
AddrManTest addrman;
BOOST_CHECK_EQUAL(addrman.size(), 0U);
CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
CAddress addr2 = CAddress(ResolveService("250.1.2.1", 9999), NODE_NONE);
CAddress addr3 = CAddress(ResolveService("251.255.2.1", 8333), NODE_NONE);
CNetAddr source1 = ResolveIP("250.1.2.1");
CNetAddr source2 = ResolveIP("250.1.2.2");
BOOST_CHECK(addrman.Add({addr1}, source1));
BOOST_CHECK(addrman.Add({addr2}, source2));
BOOST_CHECK(addrman.Add({addr3}, source1));
// Test: ensure Find returns an IP/port matching what we searched on.
AddrInfo* info1 = addrman.Find(addr1);
BOOST_REQUIRE(info1);
BOOST_CHECK_EQUAL(info1->ToString(), "250.1.2.1:8333");
// Test; Find discriminates by port number.
AddrInfo* info2 = addrman.Find(addr2);
BOOST_REQUIRE(info2);
BOOST_CHECK_EQUAL(info2->ToString(), "250.1.2.1:9999");
// Test: Find returns another IP matching what we searched on.
AddrInfo* info3 = addrman.Find(addr3);
BOOST_REQUIRE(info3);
BOOST_CHECK_EQUAL(info3->ToString(), "251.255.2.1:8333");
}
BOOST_AUTO_TEST_CASE(addrman_create)
{
AddrManTest addrman;
BOOST_CHECK_EQUAL(addrman.size(), 0U);
CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
CNetAddr source1 = ResolveIP("250.1.2.1");
int nId;
AddrInfo* pinfo = addrman.Create(addr1, source1, &nId);
// Test: The result should be the same as the input addr.
BOOST_CHECK_EQUAL(pinfo->ToString(), "250.1.2.1:8333");
AddrInfo* info2 = addrman.Find(addr1);
BOOST_CHECK_EQUAL(info2->ToString(), "250.1.2.1:8333");
}
BOOST_AUTO_TEST_CASE(addrman_delete)
{
AddrManTest addrman;
BOOST_CHECK_EQUAL(addrman.size(), 0U);
CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
CNetAddr source1 = ResolveIP("250.1.2.1");
int nId;
addrman.Create(addr1, source1, &nId);
// Test: Delete should actually delete the addr.
BOOST_CHECK_EQUAL(addrman.size(), 1U);
addrman.Delete(nId);
BOOST_CHECK_EQUAL(addrman.size(), 0U);
AddrInfo* info2 = addrman.Find(addr1);
BOOST_CHECK(info2 == nullptr);
}
BOOST_AUTO_TEST_CASE(addrman_getaddr)
{
AddrManTest addrman;
// Test: Sanity check, GetAddr should never return anything if addrman
// is empty.
BOOST_CHECK_EQUAL(addrman.size(), 0U);
std::vector<CAddress> vAddr1 = addrman.GetAddr(/*max_addresses=*/0, /*max_pct=*/0, /*network=*/std::nullopt);
BOOST_CHECK_EQUAL(vAddr1.size(), 0U);
CAddress addr1 = CAddress(ResolveService("250.250.2.1", 8333), NODE_NONE);
addr1.nTime = GetAdjustedTime(); // Set time so isTerrible = false
CAddress addr2 = CAddress(ResolveService("250.251.2.2", 9999), NODE_NONE);
addr2.nTime = GetAdjustedTime();
CAddress addr3 = CAddress(ResolveService("251.252.2.3", 8333), NODE_NONE);
addr3.nTime = GetAdjustedTime();
CAddress addr4 = CAddress(ResolveService("252.253.3.4", 8333), NODE_NONE);
addr4.nTime = GetAdjustedTime();
CAddress addr5 = CAddress(ResolveService("252.254.4.5", 8333), NODE_NONE);
addr5.nTime = GetAdjustedTime();
CNetAddr source1 = ResolveIP("250.1.2.1");
CNetAddr source2 = ResolveIP("250.2.3.3");
// Test: Ensure GetAddr works with new addresses.
BOOST_CHECK(addrman.Add({addr1, addr3, addr5}, source1));
BOOST_CHECK(addrman.Add({addr2, addr4}, source2));
BOOST_CHECK_EQUAL(addrman.GetAddr(/*max_addresses=*/0, /*max_pct=*/0, /*network=*/std::nullopt).size(), 5U);
// Net processing asks for 23% of addresses. 23% of 5 is 1 rounded down.
BOOST_CHECK_EQUAL(addrman.GetAddr(/*max_addresses=*/2500, /*max_pct=*/23, /*network=*/std::nullopt).size(), 1U);
// Test: Ensure GetAddr works with new and tried addresses.
addrman.Good(CAddress(addr1, NODE_NONE));
addrman.Good(CAddress(addr2, NODE_NONE));
BOOST_CHECK_EQUAL(addrman.GetAddr(/*max_addresses=*/0, /*max_pct=*/0, /*network=*/std::nullopt).size(), 5U);
BOOST_CHECK_EQUAL(addrman.GetAddr(/*max_addresses=*/2500, /*max_pct=*/23, /*network=*/std::nullopt).size(), 1U);
// Test: Ensure GetAddr still returns 23% when addrman has many addrs.
for (unsigned int i = 1; i < (8 * 256); i++) {
int octet1 = i % 256;
int octet2 = i >> 8 % 256;
std::string strAddr = ToString(octet1) + "." + ToString(octet2) + ".1.23";
CAddress addr = CAddress(ResolveService(strAddr), NODE_NONE);
// Ensure that for all addrs in addrman, isTerrible == false.
addr.nTime = GetAdjustedTime();
addrman.Add({addr}, ResolveIP(strAddr));
if (i % 8 == 0)
addrman.Good(addr);
}
std::vector<CAddress> vAddr = addrman.GetAddr(/*max_addresses=*/2500, /*max_pct=*/23, /*network=*/std::nullopt);
size_t percent23 = (addrman.size() * 23) / 100;
BOOST_CHECK_EQUAL(vAddr.size(), percent23);
BOOST_CHECK_EQUAL(vAddr.size(), 461U);
// (Addrman.size() < number of addresses added) due to address collisions.
BOOST_CHECK_EQUAL(addrman.size(), 2006U);
}
BOOST_AUTO_TEST_CASE(caddrinfo_get_tried_bucket_legacy)
{
AddrManTest addrman;
CAddress addr1 = CAddress(ResolveService("250.1.1.1", 8333), NODE_NONE);
CAddress addr2 = CAddress(ResolveService("250.1.1.1", 9999), NODE_NONE);
CNetAddr source1 = ResolveIP("250.1.1.1");
AddrInfo info1 = AddrInfo(addr1, source1);
uint256 nKey1 = (uint256)(CHashWriter(SER_GETHASH, 0) << 1).GetHash();
uint256 nKey2 = (uint256)(CHashWriter(SER_GETHASH, 0) << 2).GetHash();
std::vector<bool> asmap; // use /16
BOOST_CHECK_EQUAL(info1.GetTriedBucket(nKey1, asmap), 40);
// Test: Make sure key actually randomizes bucket placement. A fail on
// this test could be a security issue.
BOOST_CHECK(info1.GetTriedBucket(nKey1, asmap) != info1.GetTriedBucket(nKey2, asmap));
// Test: Two addresses with same IP but different ports can map to
// different buckets because they have different keys.
AddrInfo info2 = AddrInfo(addr2, source1);
BOOST_CHECK(info1.GetKey() != info2.GetKey());
BOOST_CHECK(info1.GetTriedBucket(nKey1, asmap) != info2.GetTriedBucket(nKey1, asmap));
std::set<int> buckets;
for (int i = 0; i < 255; i++) {
AddrInfo infoi = AddrInfo(
CAddress(ResolveService("250.1.1." + ToString(i)), NODE_NONE),
ResolveIP("250.1.1." + ToString(i)));
int bucket = infoi.GetTriedBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the same /16 prefix should
// never get more than 8 buckets with legacy grouping
BOOST_CHECK_EQUAL(buckets.size(), 8U);
buckets.clear();
for (int j = 0; j < 255; j++) {
AddrInfo infoj = AddrInfo(
CAddress(ResolveService("250." + ToString(j) + ".1.1"), NODE_NONE),
ResolveIP("250." + ToString(j) + ".1.1"));
int bucket = infoj.GetTriedBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the different /16 prefix should map to more than
// 8 buckets with legacy grouping
BOOST_CHECK_EQUAL(buckets.size(), 160U);
}
BOOST_AUTO_TEST_CASE(caddrinfo_get_new_bucket_legacy)
{
AddrManTest addrman;
CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
CAddress addr2 = CAddress(ResolveService("250.1.2.1", 9999), NODE_NONE);
CNetAddr source1 = ResolveIP("250.1.2.1");
AddrInfo info1 = AddrInfo(addr1, source1);
uint256 nKey1 = (uint256)(CHashWriter(SER_GETHASH, 0) << 1).GetHash();
uint256 nKey2 = (uint256)(CHashWriter(SER_GETHASH, 0) << 2).GetHash();
std::vector<bool> asmap; // use /16
// Test: Make sure the buckets are what we expect
BOOST_CHECK_EQUAL(info1.GetNewBucket(nKey1, asmap), 786);
BOOST_CHECK_EQUAL(info1.GetNewBucket(nKey1, source1, asmap), 786);
// Test: Make sure key actually randomizes bucket placement. A fail on
// this test could be a security issue.
BOOST_CHECK(info1.GetNewBucket(nKey1, asmap) != info1.GetNewBucket(nKey2, asmap));
// Test: Ports should not affect bucket placement in the addr
AddrInfo info2 = AddrInfo(addr2, source1);
BOOST_CHECK(info1.GetKey() != info2.GetKey());
BOOST_CHECK_EQUAL(info1.GetNewBucket(nKey1, asmap), info2.GetNewBucket(nKey1, asmap));
std::set<int> buckets;
for (int i = 0; i < 255; i++) {
AddrInfo infoi = AddrInfo(
CAddress(ResolveService("250.1.1." + ToString(i)), NODE_NONE),
ResolveIP("250.1.1." + ToString(i)));
int bucket = infoi.GetNewBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the same group (\16 prefix for IPv4) should
// always map to the same bucket.
BOOST_CHECK_EQUAL(buckets.size(), 1U);
buckets.clear();
for (int j = 0; j < 4 * 255; j++) {
AddrInfo infoj = AddrInfo(CAddress(
ResolveService(
ToString(250 + (j / 255)) + "." + ToString(j % 256) + ".1.1"), NODE_NONE),
ResolveIP("251.4.1.1"));
int bucket = infoj.GetNewBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the same source groups should map to NO MORE
// than 64 buckets.
BOOST_CHECK(buckets.size() <= 64);
buckets.clear();
for (int p = 0; p < 255; p++) {
AddrInfo infoj = AddrInfo(
CAddress(ResolveService("250.1.1.1"), NODE_NONE),
ResolveIP("250." + ToString(p) + ".1.1"));
int bucket = infoj.GetNewBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the different source groups should map to MORE
// than 64 buckets.
BOOST_CHECK(buckets.size() > 64);
}
// The following three test cases use asmap.raw
// We use an artificial minimal mock mapping
// 250.0.0.0/8 AS1000
// 101.1.0.0/16 AS1
// 101.2.0.0/16 AS2
// 101.3.0.0/16 AS3
// 101.4.0.0/16 AS4
// 101.5.0.0/16 AS5
// 101.6.0.0/16 AS6
// 101.7.0.0/16 AS7
// 101.8.0.0/16 AS8
BOOST_AUTO_TEST_CASE(caddrinfo_get_tried_bucket)
{
AddrManTest addrman;
CAddress addr1 = CAddress(ResolveService("250.1.1.1", 8333), NODE_NONE);
CAddress addr2 = CAddress(ResolveService("250.1.1.1", 9999), NODE_NONE);
CNetAddr source1 = ResolveIP("250.1.1.1");
AddrInfo info1 = AddrInfo(addr1, source1);
uint256 nKey1 = (uint256)(CHashWriter(SER_GETHASH, 0) << 1).GetHash();
uint256 nKey2 = (uint256)(CHashWriter(SER_GETHASH, 0) << 2).GetHash();
std::vector<bool> asmap = FromBytes(asmap_raw, sizeof(asmap_raw) * 8);
BOOST_CHECK_EQUAL(info1.GetTriedBucket(nKey1, asmap), 236);
// Test: Make sure key actually randomizes bucket placement. A fail on
// this test could be a security issue.
BOOST_CHECK(info1.GetTriedBucket(nKey1, asmap) != info1.GetTriedBucket(nKey2, asmap));
// Test: Two addresses with same IP but different ports can map to
// different buckets because they have different keys.
AddrInfo info2 = AddrInfo(addr2, source1);
BOOST_CHECK(info1.GetKey() != info2.GetKey());
BOOST_CHECK(info1.GetTriedBucket(nKey1, asmap) != info2.GetTriedBucket(nKey1, asmap));
std::set<int> buckets;
for (int j = 0; j < 255; j++) {
AddrInfo infoj = AddrInfo(
CAddress(ResolveService("101." + ToString(j) + ".1.1"), NODE_NONE),
ResolveIP("101." + ToString(j) + ".1.1"));
int bucket = infoj.GetTriedBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the different /16 prefix MAY map to more than
// 8 buckets.
BOOST_CHECK(buckets.size() > 8);
buckets.clear();
for (int j = 0; j < 255; j++) {
AddrInfo infoj = AddrInfo(
CAddress(ResolveService("250." + ToString(j) + ".1.1"), NODE_NONE),
ResolveIP("250." + ToString(j) + ".1.1"));
int bucket = infoj.GetTriedBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the different /16 prefix MAY NOT map to more than
// 8 buckets.
BOOST_CHECK(buckets.size() == 8);
}
BOOST_AUTO_TEST_CASE(caddrinfo_get_new_bucket)
{
AddrManTest addrman;
CAddress addr1 = CAddress(ResolveService("250.1.2.1", 8333), NODE_NONE);
CAddress addr2 = CAddress(ResolveService("250.1.2.1", 9999), NODE_NONE);
CNetAddr source1 = ResolveIP("250.1.2.1");
AddrInfo info1 = AddrInfo(addr1, source1);
uint256 nKey1 = (uint256)(CHashWriter(SER_GETHASH, 0) << 1).GetHash();
uint256 nKey2 = (uint256)(CHashWriter(SER_GETHASH, 0) << 2).GetHash();
std::vector<bool> asmap = FromBytes(asmap_raw, sizeof(asmap_raw) * 8);
// Test: Make sure the buckets are what we expect
BOOST_CHECK_EQUAL(info1.GetNewBucket(nKey1, asmap), 795);
BOOST_CHECK_EQUAL(info1.GetNewBucket(nKey1, source1, asmap), 795);
// Test: Make sure key actually randomizes bucket placement. A fail on
// this test could be a security issue.
BOOST_CHECK(info1.GetNewBucket(nKey1, asmap) != info1.GetNewBucket(nKey2, asmap));
// Test: Ports should not affect bucket placement in the addr
AddrInfo info2 = AddrInfo(addr2, source1);
BOOST_CHECK(info1.GetKey() != info2.GetKey());
BOOST_CHECK_EQUAL(info1.GetNewBucket(nKey1, asmap), info2.GetNewBucket(nKey1, asmap));
std::set<int> buckets;
for (int i = 0; i < 255; i++) {
AddrInfo infoi = AddrInfo(
CAddress(ResolveService("250.1.1." + ToString(i)), NODE_NONE),
ResolveIP("250.1.1." + ToString(i)));
int bucket = infoi.GetNewBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the same /16 prefix
// usually map to the same bucket.
BOOST_CHECK_EQUAL(buckets.size(), 1U);
buckets.clear();
for (int j = 0; j < 4 * 255; j++) {
AddrInfo infoj = AddrInfo(CAddress(
ResolveService(
ToString(250 + (j / 255)) + "." + ToString(j % 256) + ".1.1"), NODE_NONE),
ResolveIP("251.4.1.1"));
int bucket = infoj.GetNewBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the same source /16 prefix should not map to more
// than 64 buckets.
BOOST_CHECK(buckets.size() <= 64);
buckets.clear();
for (int p = 0; p < 255; p++) {
AddrInfo infoj = AddrInfo(
CAddress(ResolveService("250.1.1.1"), NODE_NONE),
ResolveIP("101." + ToString(p) + ".1.1"));
int bucket = infoj.GetNewBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the different source /16 prefixes usually map to MORE
// than 1 bucket.
BOOST_CHECK(buckets.size() > 1);
buckets.clear();
for (int p = 0; p < 255; p++) {
AddrInfo infoj = AddrInfo(
CAddress(ResolveService("250.1.1.1"), NODE_NONE),
ResolveIP("250." + ToString(p) + ".1.1"));
int bucket = infoj.GetNewBucket(nKey1, asmap);
buckets.insert(bucket);
}
// Test: IP addresses in the different source /16 prefixes sometimes map to NO MORE
// than 1 bucket.
BOOST_CHECK(buckets.size() == 1);
}
BOOST_AUTO_TEST_CASE(addrman_serialization)
{
std::vector<bool> asmap1 = FromBytes(asmap_raw, sizeof(asmap_raw) * 8);
auto addrman_asmap1 = std::make_unique<AddrManTest>(asmap1);
auto addrman_asmap1_dup = std::make_unique<AddrManTest>(asmap1);
auto addrman_noasmap = std::make_unique<AddrManTest>();
CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
CAddress addr = CAddress(ResolveService("250.1.1.1"), NODE_NONE);
CNetAddr default_source;
addrman_asmap1->Add({addr}, default_source);
stream << *addrman_asmap1;
// serizalizing/deserializing addrman with the same asmap
stream >> *addrman_asmap1_dup;
std::pair<int, int> bucketAndEntry_asmap1 = addrman_asmap1->GetBucketAndEntry(addr);
std::pair<int, int> bucketAndEntry_asmap1_dup = addrman_asmap1_dup->GetBucketAndEntry(addr);
BOOST_CHECK(bucketAndEntry_asmap1.second != -1);
BOOST_CHECK(bucketAndEntry_asmap1_dup.second != -1);
BOOST_CHECK(bucketAndEntry_asmap1.first == bucketAndEntry_asmap1_dup.first);
BOOST_CHECK(bucketAndEntry_asmap1.second == bucketAndEntry_asmap1_dup.second);
// deserializing asmaped peers.dat to non-asmaped addrman
stream << *addrman_asmap1;
stream >> *addrman_noasmap;
std::pair<int, int> bucketAndEntry_noasmap = addrman_noasmap->GetBucketAndEntry(addr);
BOOST_CHECK(bucketAndEntry_noasmap.second != -1);
BOOST_CHECK(bucketAndEntry_asmap1.first != bucketAndEntry_noasmap.first);
BOOST_CHECK(bucketAndEntry_asmap1.second != bucketAndEntry_noasmap.second);
// deserializing non-asmaped peers.dat to asmaped addrman
addrman_asmap1 = std::make_unique<AddrManTest>(asmap1);
addrman_noasmap = std::make_unique<AddrManTest>();
addrman_noasmap->Add({addr}, default_source);
stream << *addrman_noasmap;
stream >> *addrman_asmap1;
std::pair<int, int> bucketAndEntry_asmap1_deser = addrman_asmap1->GetBucketAndEntry(addr);
BOOST_CHECK(bucketAndEntry_asmap1_deser.second != -1);
BOOST_CHECK(bucketAndEntry_asmap1_deser.first != bucketAndEntry_noasmap.first);
BOOST_CHECK(bucketAndEntry_asmap1_deser.first == bucketAndEntry_asmap1_dup.first);
BOOST_CHECK(bucketAndEntry_asmap1_deser.second == bucketAndEntry_asmap1_dup.second);
// used to map to different buckets, now maps to the same bucket.
addrman_asmap1 = std::make_unique<AddrManTest>(asmap1);
addrman_noasmap = std::make_unique<AddrManTest>();
CAddress addr1 = CAddress(ResolveService("250.1.1.1"), NODE_NONE);
CAddress addr2 = CAddress(ResolveService("250.2.1.1"), NODE_NONE);
addrman_noasmap->Add({addr, addr2}, default_source);
std::pair<int, int> bucketAndEntry_noasmap_addr1 = addrman_noasmap->GetBucketAndEntry(addr1);
std::pair<int, int> bucketAndEntry_noasmap_addr2 = addrman_noasmap->GetBucketAndEntry(addr2);
BOOST_CHECK(bucketAndEntry_noasmap_addr1.first != bucketAndEntry_noasmap_addr2.first);
BOOST_CHECK(bucketAndEntry_noasmap_addr1.second != bucketAndEntry_noasmap_addr2.second);
stream << *addrman_noasmap;
stream >> *addrman_asmap1;
std::pair<int, int> bucketAndEntry_asmap1_deser_addr1 = addrman_asmap1->GetBucketAndEntry(addr1);
std::pair<int, int> bucketAndEntry_asmap1_deser_addr2 = addrman_asmap1->GetBucketAndEntry(addr2);
BOOST_CHECK(bucketAndEntry_asmap1_deser_addr1.first == bucketAndEntry_asmap1_deser_addr2.first);
BOOST_CHECK(bucketAndEntry_asmap1_deser_addr1.second != bucketAndEntry_asmap1_deser_addr2.second);
}
BOOST_AUTO_TEST_CASE(remove_invalid)
{
// Confirm that invalid addresses are ignored in unserialization.
auto addrman = std::make_unique<AddrManTest>();
CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
const CAddress new1{ResolveService("5.5.5.5"), NODE_NONE};
const CAddress new2{ResolveService("6.6.6.6"), NODE_NONE};
const CAddress tried1{ResolveService("7.7.7.7"), NODE_NONE};
const CAddress tried2{ResolveService("8.8.8.8"), NODE_NONE};
addrman->Add({new1, tried1, new2, tried2}, CNetAddr{});
addrman->Good(tried1);
addrman->Good(tried2);
BOOST_REQUIRE_EQUAL(addrman->size(), 4);
stream << *addrman;
const std::string str{stream.str()};
size_t pos;
const char new2_raw[]{6, 6, 6, 6};
const uint8_t new2_raw_replacement[]{0, 0, 0, 0}; // 0.0.0.0 is !IsValid()
pos = str.find(new2_raw, 0, sizeof(new2_raw));
BOOST_REQUIRE(pos != std::string::npos);
BOOST_REQUIRE(pos + sizeof(new2_raw_replacement) <= stream.size());
memcpy(stream.data() + pos, new2_raw_replacement, sizeof(new2_raw_replacement));
const char tried2_raw[]{8, 8, 8, 8};
const uint8_t tried2_raw_replacement[]{255, 255, 255, 255}; // 255.255.255.255 is !IsValid()
pos = str.find(tried2_raw, 0, sizeof(tried2_raw));
BOOST_REQUIRE(pos != std::string::npos);
BOOST_REQUIRE(pos + sizeof(tried2_raw_replacement) <= stream.size());
memcpy(stream.data() + pos, tried2_raw_replacement, sizeof(tried2_raw_replacement));
addrman = std::make_unique<AddrManTest>();
stream >> *addrman;
BOOST_CHECK_EQUAL(addrman->size(), 2);
}
BOOST_AUTO_TEST_CASE(addrman_selecttriedcollision)
{
AddrManTest addrman;
BOOST_CHECK(addrman.size() == 0);
// Empty addrman should return blank addrman info.
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
// Add twenty two addresses.
CNetAddr source = ResolveIP("252.2.2.2");
for (unsigned int i = 1; i < 23; i++) {
CService addr = ResolveService("250.1.1." + ToString(i));
BOOST_CHECK(addrman.Add({CAddress(addr, NODE_NONE)}, source));
addrman.Good(addr);
// No collisions yet.
BOOST_CHECK(addrman.size() == i);
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
}
// Ensure Good handles duplicates well.
for (unsigned int i = 1; i < 23; i++) {
CService addr = ResolveService("250.1.1." + ToString(i));
addrman.Good(addr);
BOOST_CHECK(addrman.size() == 22);
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
}
}
BOOST_AUTO_TEST_CASE(addrman_noevict)
{
AddrManTest addrman;
// Add 35 addresses.
CNetAddr source = ResolveIP("252.2.2.2");
for (unsigned int i = 1; i < 36; i++) {
CService addr = ResolveService("250.1.1." + ToString(i));
BOOST_CHECK(addrman.Add({CAddress(addr, NODE_NONE)}, source));
addrman.Good(addr);
// No collision yet.
BOOST_CHECK(addrman.size() == i);
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
}
// Collision between 36 and 19.
CService addr36 = ResolveService("250.1.1.36");
BOOST_CHECK(addrman.Add({CAddress(addr36, NODE_NONE)}, source));
addrman.Good(addr36);
BOOST_CHECK(addrman.size() == 36);
BOOST_CHECK_EQUAL(addrman.SelectTriedCollision().first.ToString(), "250.1.1.19:0");
// 36 should be discarded and 19 not evicted.
addrman.ResolveCollisions();
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
// Lets create two collisions.
for (unsigned int i = 37; i < 59; i++) {
CService addr = ResolveService("250.1.1." + ToString(i));
BOOST_CHECK(addrman.Add({CAddress(addr, NODE_NONE)}, source));
addrman.Good(addr);
BOOST_CHECK(addrman.size() == i);
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
}
// Cause a collision.
CService addr59 = ResolveService("250.1.1.59");
BOOST_CHECK(addrman.Add({CAddress(addr59, NODE_NONE)}, source));
addrman.Good(addr59);
BOOST_CHECK(addrman.size() == 59);
BOOST_CHECK_EQUAL(addrman.SelectTriedCollision().first.ToString(), "250.1.1.10:0");
// Cause a second collision.
BOOST_CHECK(!addrman.Add({CAddress(addr36, NODE_NONE)}, source));
addrman.Good(addr36);
BOOST_CHECK(addrman.size() == 59);
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() != "[::]:0");
addrman.ResolveCollisions();
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
}
BOOST_AUTO_TEST_CASE(addrman_evictionworks)
{
AddrManTest addrman;
BOOST_CHECK(addrman.size() == 0);
// Empty addrman should return blank addrman info.
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
// Add 35 addresses
CNetAddr source = ResolveIP("252.2.2.2");
for (unsigned int i = 1; i < 36; i++) {
CService addr = ResolveService("250.1.1." + ToString(i));
BOOST_CHECK(addrman.Add({CAddress(addr, NODE_NONE)}, source));
addrman.Good(addr);
// No collision yet.
BOOST_CHECK(addrman.size() == i);
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
}
// Collision between 36 and 19.
CService addr = ResolveService("250.1.1.36");
BOOST_CHECK(addrman.Add({CAddress(addr, NODE_NONE)}, source));
addrman.Good(addr);
BOOST_CHECK_EQUAL(addrman.size(), 36);
auto info = addrman.SelectTriedCollision().first;
BOOST_CHECK_EQUAL(info.ToString(), "250.1.1.19:0");
// Ensure test of address fails, so that it is evicted.
addrman.SimConnFail(info);
// Should swap 36 for 19.
addrman.ResolveCollisions();
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
// If 36 was swapped for 19, then this should cause no collisions.
BOOST_CHECK(!addrman.Add({CAddress(addr, NODE_NONE)}, source));
addrman.Good(addr);
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
// If we insert 19 it should collide with 36
CService addr19 = ResolveService("250.1.1.19");
BOOST_CHECK(!addrman.Add({CAddress(addr19, NODE_NONE)}, source));
addrman.Good(addr19);
BOOST_CHECK_EQUAL(addrman.SelectTriedCollision().first.ToString(), "250.1.1.36:0");
addrman.ResolveCollisions();
BOOST_CHECK(addrman.SelectTriedCollision().first.ToString() == "[::]:0");
}
static CDataStream AddrmanToStream(const AddrMan& addrman)
{
CDataStream ssPeersIn(SER_DISK, CLIENT_VERSION);
ssPeersIn << Params().MessageStart();
ssPeersIn << addrman;
return ssPeersIn;
}
BOOST_AUTO_TEST_CASE(load_addrman)
{
AddrMan addrman{/*asmap=*/ std::vector<bool>(), /*deterministic=*/ true,
/*consistency_check_ratio=*/ 100};
CService addr1, addr2, addr3;
BOOST_CHECK(Lookup("250.7.1.1", addr1, 8333, false));
BOOST_CHECK(Lookup("250.7.2.2", addr2, 9999, false));
BOOST_CHECK(Lookup("250.7.3.3", addr3, 9999, false));
BOOST_CHECK(Lookup("250.7.3.3"s, addr3, 9999, false));
BOOST_CHECK(!Lookup("250.7.3.3\0example.com"s, addr3, 9999, false));
// Add three addresses to new table.
CService source;
BOOST_CHECK(Lookup("252.5.1.1", source, 8333, false));
std::vector<CAddress> addresses{CAddress(addr1, NODE_NONE), CAddress(addr2, NODE_NONE), CAddress(addr3, NODE_NONE)};
BOOST_CHECK(addrman.Add(addresses, source));
BOOST_CHECK(addrman.size() == 3);
// Test that the de-serialization does not throw an exception.
CDataStream ssPeers1 = AddrmanToStream(addrman);
bool exceptionThrown = false;
AddrMan addrman1(/*asmap=*/std::vector<bool>(), /*deterministic=*/false, /*consistency_check_ratio=*/100);
BOOST_CHECK(addrman1.size() == 0);
try {
unsigned char pchMsgTmp[4];
ssPeers1 >> pchMsgTmp;
ssPeers1 >> addrman1;
} catch (const std::exception&) {
exceptionThrown = true;
}
BOOST_CHECK(addrman1.size() == 3);
BOOST_CHECK(exceptionThrown == false);
// Test that ReadFromStream creates an addrman with the correct number of addrs.
CDataStream ssPeers2 = AddrmanToStream(addrman);
AddrMan addrman2(/*asmap=*/std::vector<bool>(), /*deterministic=*/false, /*consistency_check_ratio=*/100);
BOOST_CHECK(addrman2.size() == 0);
ReadFromStream(addrman2, ssPeers2);
BOOST_CHECK(addrman2.size() == 3);
}
// Produce a corrupt peers.dat that claims 20 addrs when it only has one addr.
static CDataStream MakeCorruptPeersDat()