-
Notifications
You must be signed in to change notification settings - Fork 418
/
NetDb.cpp
1557 lines (1465 loc) 路 50.6 KB
/
NetDb.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) 2013-2024, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include <string.h>
#include <fstream>
#include <vector>
#include <map>
#include <random>
#include <boost/asio.hpp>
#include <stdexcept>
#include "I2PEndian.h"
#include "Base.h"
#include "Crypto.h"
#include "Log.h"
#include "Timestamp.h"
#include "I2NPProtocol.h"
#include "Tunnel.h"
#include "Transports.h"
#include "NTCP2.h"
#include "RouterContext.h"
#include "Garlic.h"
#include "ECIESX25519AEADRatchetSession.h"
#include "Config.h"
#include "NetDb.hpp"
#include "util.h"
using namespace i2p::transport;
namespace i2p
{
namespace data
{
NetDb netdb;
NetDb::NetDb (): m_IsRunning (false), m_Thread (nullptr), m_Reseeder (nullptr),
m_Storage("netDb", "r", "routerInfo-", "dat"), m_PersistProfiles (true),
m_LastExploratorySelectionUpdateTime (0)
{
}
NetDb::~NetDb ()
{
Stop ();
delete m_Reseeder;
}
void NetDb::Start ()
{
m_Storage.SetPlace(i2p::fs::GetDataDir());
m_Storage.Init(i2p::data::GetBase64SubstitutionTable(), 64);
InitProfilesStorage ();
m_Families.LoadCertificates ();
Load ();
if (!m_Requests)
{
m_Requests = std::make_shared<NetDbRequests>();
m_Requests->Start ();
}
uint16_t threshold; i2p::config::GetOption("reseed.threshold", threshold);
if (m_RouterInfos.size () < threshold || m_Floodfills.GetSize () < NETDB_MIN_FLOODFILLS) // reseed if # of router less than threshold or too few floodfiils
{
Reseed ();
}
else if (!GetRandomRouter (i2p::context.GetSharedRouterInfo (), false, false))
Reseed (); // we don't have a router we can connect to. Trying to reseed
auto it = m_RouterInfos.find (i2p::context.GetIdentHash ());
if (it != m_RouterInfos.end ())
{
// remove own router
m_Floodfills.Remove (it->second->GetIdentHash ());
m_RouterInfos.erase (it);
}
// insert own router
m_RouterInfos.emplace (i2p::context.GetIdentHash (), i2p::context.GetSharedRouterInfo ());
if (i2p::context.IsFloodfill ())
m_Floodfills.Insert (i2p::context.GetSharedRouterInfo ());
i2p::config::GetOption("persist.profiles", m_PersistProfiles);
m_IsRunning = true;
m_Thread = new std::thread (std::bind (&NetDb::Run, this));
}
void NetDb::Stop ()
{
if (m_Requests)
m_Requests->Stop ();
if (m_IsRunning)
{
if (m_PersistProfiles)
SaveProfiles ();
DeleteObsoleteProfiles ();
m_RouterInfos.clear ();
m_Floodfills.Clear ();
if (m_Thread)
{
m_IsRunning = false;
m_Queue.WakeUp ();
m_Thread->join ();
delete m_Thread;
m_Thread = 0;
}
m_LeaseSets.clear();
}
m_Requests = nullptr;
}
void NetDb::Run ()
{
i2p::util::SetThreadName("NetDB");
uint64_t lastManage = 0, lastExploratory = 0, lastManageRequest = 0;
uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), lastObsoleteProfilesCleanup = lastProfilesCleanup;
int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 0, exploratoryIntervalVariance = 0;
while (m_IsRunning)
{
try
{
auto msg = m_Queue.GetNextWithTimeout (1000); // 1 sec
if (msg)
{
int numMsgs = 0;
while (msg)
{
LogPrint(eLogDebug, "NetDb: Got request with type ", (int) msg->GetTypeID ());
switch (msg->GetTypeID ())
{
case eI2NPDatabaseStore:
HandleDatabaseStoreMsg (msg);
break;
case eI2NPDatabaseSearchReply:
HandleDatabaseSearchReplyMsg (msg);
break;
case eI2NPDatabaseLookup:
HandleDatabaseLookupMsg (msg);
break;
case eI2NPDummyMsg:
// plain RouterInfo from NTCP2 with flags for now
HandleNTCP2RouterInfoMsg (msg);
break;
default: // WTF?
LogPrint (eLogError, "NetDb: Unexpected message type ", (int) msg->GetTypeID ());
//i2p::HandleI2NPMessage (msg);
}
if (numMsgs > 100) break;
msg = m_Queue.Get ();
numMsgs++;
}
}
if (!m_IsRunning) break;
if (!i2p::transport::transports.IsOnline () || !i2p::transport::transports.IsRunning ())
continue; // don't manage netdb when offline or transports are not running
uint64_t mts = i2p::util::GetMonotonicMilliseconds ();
if (mts >= lastManageRequest + MANAGE_REQUESTS_INTERVAL*1000)
{
if (lastManageRequest || i2p::tunnel::tunnels.GetExploratoryPool ()) // expolratory pool is ready?
{
if (m_Requests) m_Requests->ManageRequests ();
lastManageRequest = mts;
}
}
if (mts >= lastManage + 60000) // manage routers and leasesets every minute
{
if (lastManage)
{
ManageRouterInfos ();
ManageLeaseSets ();
}
lastManage = mts;
}
if (mts >= lastProfilesCleanup + (uint64_t)(i2p::data::PEER_PROFILE_AUTOCLEAN_TIMEOUT + profilesCleanupVariance)*1000)
{
m_RouterProfilesPool.CleanUpMt ();
if (m_PersistProfiles)
{
bool isSaving = m_SavingProfiles.valid ();
if (isSaving && m_SavingProfiles.wait_for(std::chrono::seconds(0)) == std::future_status::ready) // still active?
{
m_SavingProfiles.get ();
isSaving = false;
}
if (!isSaving)
m_SavingProfiles = PersistProfiles ();
else
LogPrint (eLogWarning, "NetDb: Can't persist profiles. Profiles are being saved to disk");
}
lastProfilesCleanup = mts;
profilesCleanupVariance = rand () % i2p::data::PEER_PROFILE_AUTOCLEAN_VARIANCE;
}
if (mts >= lastObsoleteProfilesCleanup + (uint64_t)(i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_TIMEOUT + obsoleteProfilesCleanVariance)*1000)
{
bool isDeleting = m_DeletingProfiles.valid ();
if (isDeleting && m_DeletingProfiles.wait_for(std::chrono::seconds(0)) == std::future_status::ready) // still active?
{
m_DeletingProfiles.get ();
isDeleting = false;
}
if (!isDeleting)
m_DeletingProfiles = DeleteObsoleteProfiles ();
else
LogPrint (eLogWarning, "NetDb: Can't delete profiles. Profiles are being deleted from disk");
lastObsoleteProfilesCleanup = mts;
obsoleteProfilesCleanVariance = rand () % i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE;
}
if (mts >= lastExploratory + NETDB_EXPLORATORY_INTERVAL*1000LL) // check exploratory every 55 seconds
{
auto numRouters = m_RouterInfos.size ();
if (!numRouters)
throw std::runtime_error("No known routers, reseed seems to be totally failed");
else // we have peers now
m_FloodfillBootstrap = nullptr;
if (numRouters < 2500 || mts >= lastExploratory + (NETDB_EXPLORATORY_INTERVAL + exploratoryIntervalVariance)*1000LL)
{
if(!i2p::context.IsHidden ())
{
numRouters = 800/numRouters;
if (numRouters < 1) numRouters = 1;
if (numRouters > 9) numRouters = 9;
Explore (numRouters);
}
lastExploratory = mts;
exploratoryIntervalVariance = rand () % NETDB_EXPLORATORY_INTERVAL_VARIANCE;
}
}
}
catch (std::exception& ex)
{
LogPrint (eLogError, "NetDb: Runtime exception: ", ex.what ());
}
}
}
std::shared_ptr<const RouterInfo> NetDb::AddRouterInfo (const uint8_t * buf, int len)
{
bool updated;
return AddRouterInfo (buf, len, updated);
}
std::shared_ptr<const RouterInfo> NetDb::AddRouterInfo (const uint8_t * buf, int len, bool& updated)
{
IdentityEx identity;
if (identity.FromBuffer (buf, len))
return AddRouterInfo (identity.GetIdentHash (), buf, len, updated);
updated = false;
return nullptr;
}
bool NetDb::AddRouterInfo (const IdentHash& ident, const uint8_t * buf, int len)
{
bool updated;
if (!AddRouterInfo (ident, buf, len, updated))
updated = false;
return updated;
}
std::shared_ptr<const RouterInfo> NetDb::AddRouterInfo (const IdentHash& ident, const uint8_t * buf, int len, bool& updated)
{
updated = true;
auto r = FindRouter (ident);
if (r)
{
if (r->IsNewer (buf, len))
{
bool wasFloodfill = r->IsFloodfill ();
{
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
if (!r->Update (buf, len))
{
updated = false;
m_Requests->RequestComplete (ident, r);
return r;
}
if (r->IsUnreachable () ||
i2p::util::GetMillisecondsSinceEpoch () + NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL < r->GetTimestamp ())
{
// delete router as invalid or from future after update
m_RouterInfos.erase (ident);
if (wasFloodfill)
{
std::lock_guard<std::mutex> l(m_FloodfillsMutex);
m_Floodfills.Remove (r->GetIdentHash ());
}
m_Requests->RequestComplete (ident, nullptr);
return nullptr;
}
}
if (CheckLogLevel (eLogInfo))
LogPrint (eLogInfo, "NetDb: RouterInfo updated: ", ident.ToBase64());
if (wasFloodfill != r->IsFloodfill ()) // if floodfill status updated
{
if (CheckLogLevel (eLogDebug))
LogPrint (eLogDebug, "NetDb: RouterInfo floodfill status updated: ", ident.ToBase64());
std::lock_guard<std::mutex> l(m_FloodfillsMutex);
if (wasFloodfill)
m_Floodfills.Remove (r->GetIdentHash ());
else if (r->IsEligibleFloodfill ())
{
if (m_Floodfills.GetSize () < NETDB_NUM_FLOODFILLS_THRESHOLD || r->GetProfile ()->IsReal ())
m_Floodfills.Insert (r);
else
r->ResetFloodfill ();
}
}
}
else
{
if (CheckLogLevel (eLogDebug))
LogPrint (eLogDebug, "NetDb: RouterInfo is older: ", ident.ToBase64());
updated = false;
}
}
else
{
r = std::make_shared<RouterInfo> (buf, len);
bool isValid = !r->IsUnreachable () && r->HasValidAddresses () && (!r->IsFloodfill () || !r->GetProfile ()->IsUnreachable ());
if (isValid)
{
auto mts = i2p::util::GetMillisecondsSinceEpoch ();
isValid = mts + NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL > r->GetTimestamp () && // from future
mts < r->GetTimestamp () + NETDB_MAX_EXPIRATION_TIMEOUT*1000LL; // too old
}
if (isValid)
{
bool inserted = false;
{
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
inserted = m_RouterInfos.insert ({r->GetIdentHash (), r}).second;
}
if (inserted)
{
if (CheckLogLevel (eLogInfo))
LogPrint (eLogInfo, "NetDb: RouterInfo added: ", ident.ToBase64());
if (r->IsFloodfill () && r->IsEligibleFloodfill ())
{
if (m_Floodfills.GetSize () < NETDB_NUM_FLOODFILLS_THRESHOLD ||
r->GetProfile ()->IsReal ()) // don't insert floodfill until it's known real if we have enough
{
std::lock_guard<std::mutex> l(m_FloodfillsMutex);
m_Floodfills.Insert (r);
}
else
r->ResetFloodfill ();
}
}
else
{
LogPrint (eLogWarning, "NetDb: Duplicated RouterInfo ", ident.ToBase64());
updated = false;
}
}
else
updated = false;
}
// take care about requested destination
m_Requests->RequestComplete (ident, r);
return r;
}
bool NetDb::AddLeaseSet (const IdentHash& ident, const uint8_t * buf, int len)
{
std::lock_guard<std::mutex> lock(m_LeaseSetsMutex);
bool updated = false;
auto it = m_LeaseSets.find(ident);
if (it != m_LeaseSets.end () && it->second->GetStoreType () == i2p::data::NETDB_STORE_TYPE_LEASESET)
{
// we update only is existing LeaseSet is not LeaseSet2
uint64_t expires;
if(LeaseSetBufferValidate(buf, len, expires))
{
if(it->second->GetExpirationTime() < expires)
{
it->second->Update (buf, len, false); // signature is verified already
if (CheckLogLevel (eLogInfo))
LogPrint (eLogInfo, "NetDb: LeaseSet updated: ", ident.ToBase32());
updated = true;
}
else if (CheckLogLevel (eLogDebug))
LogPrint(eLogDebug, "NetDb: LeaseSet is older: ", ident.ToBase32());
}
else
LogPrint(eLogError, "NetDb: LeaseSet is invalid: ", ident.ToBase32());
}
else
{
auto leaseSet = std::make_shared<LeaseSet> (buf, len, false); // we don't need leases in netdb
if (leaseSet->IsValid ())
{
if (CheckLogLevel (eLogInfo))
LogPrint (eLogInfo, "NetDb: LeaseSet added: ", ident.ToBase32());
m_LeaseSets[ident] = leaseSet;
updated = true;
}
else
LogPrint (eLogError, "NetDb: New LeaseSet validation failed: ", ident.ToBase32());
}
return updated;
}
bool NetDb::AddLeaseSet2 (const IdentHash& ident, const uint8_t * buf, int len, uint8_t storeType)
{
auto leaseSet = std::make_shared<LeaseSet2> (storeType, buf, len, false); // we don't need leases in netdb
if (leaseSet->IsValid ())
{
std::lock_guard<std::mutex> lock(m_LeaseSetsMutex);
auto it = m_LeaseSets.find(ident);
if (it == m_LeaseSets.end () || it->second->GetStoreType () != storeType ||
leaseSet->GetPublishedTimestamp () > it->second->GetPublishedTimestamp ())
{
if (leaseSet->IsPublic () && !leaseSet->IsExpired () &&
i2p::util::GetSecondsSinceEpoch () + NETDB_EXPIRATION_TIMEOUT_THRESHOLD > leaseSet->GetPublishedTimestamp ())
{
// TODO: implement actual update
if (CheckLogLevel (eLogInfo))
LogPrint (eLogInfo, "NetDb: LeaseSet2 updated: ", ident.ToBase32());
m_LeaseSets[ident] = leaseSet;
return true;
}
else
{
LogPrint (eLogWarning, "NetDb: Unpublished or expired or future LeaseSet2 received: ", ident.ToBase32());
m_LeaseSets.erase (ident);
}
}
}
else
LogPrint (eLogError, "NetDb: New LeaseSet2 validation failed: ", ident.ToBase32());
return false;
}
std::shared_ptr<RouterInfo> NetDb::FindRouter (const IdentHash& ident) const
{
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
auto it = m_RouterInfos.find (ident);
if (it != m_RouterInfos.end ())
return it->second;
else
return nullptr;
}
std::shared_ptr<LeaseSet> NetDb::FindLeaseSet (const IdentHash& destination) const
{
std::lock_guard<std::mutex> lock(m_LeaseSetsMutex);
auto it = m_LeaseSets.find (destination);
if (it != m_LeaseSets.end ())
return it->second;
else
return nullptr;
}
std::shared_ptr<RouterProfile> NetDb::FindRouterProfile (const IdentHash& ident) const
{
if (!m_PersistProfiles)
return nullptr;
auto router = FindRouter (ident);
return router ? router->GetProfile () : nullptr;
}
void NetDb::SetUnreachable (const IdentHash& ident, bool unreachable)
{
auto r = FindRouter (ident);
if (r)
{
r->SetUnreachable (unreachable);
auto profile = r->GetProfile ();
if (profile)
{
profile->Unreachable (unreachable);
if (!unreachable && r->IsDeclaredFloodfill () && !r->IsFloodfill () &&
r->IsEligibleFloodfill () && profile->IsReal ())
{
// enable previously disabled floodfill
r->SetFloodfill ();
std::lock_guard<std::mutex> l(m_FloodfillsMutex);
m_Floodfills.Insert (r);
}
}
}
}
void NetDb::ExcludeReachableTransports (const IdentHash& ident, RouterInfo::CompatibleTransports transports)
{
auto r = FindRouter (ident);
if (r)
{
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
r->ExcludeReachableTransports (transports);
}
}
void NetDb::Reseed ()
{
if (!m_Reseeder)
{
m_Reseeder = new Reseeder ();
m_Reseeder->LoadCertificates (); // we need certificates for SU3 verification
}
// try reseeding from floodfill first if specified
std::string riPath; i2p::config::GetOption("reseed.floodfill", riPath);
if (!riPath.empty())
{
auto ri = std::make_shared<RouterInfo>(riPath);
if (ri->IsFloodfill())
{
const uint8_t * riData = ri->GetBuffer();
int riLen = ri->GetBufferLen();
if (!i2p::data::netdb.AddRouterInfo(riData, riLen))
{
// bad router info
LogPrint(eLogError, "NetDb: Bad router info");
return;
}
m_FloodfillBootstrap = ri;
//ReseedFromFloodfill(*ri);
// don't try reseed servers if trying to bootstrap from floodfill
return;
}
}
m_Reseeder->Bootstrap ();
}
void NetDb::ReseedFromFloodfill(const RouterInfo & ri, int numRouters, int numFloodfills)
{
LogPrint(eLogInfo, "NetDB: Reseeding from floodfill ", ri.GetIdentHashBase64());
std::vector<std::shared_ptr<i2p::I2NPMessage> > requests;
i2p::data::IdentHash ourIdent = i2p::context.GetIdentHash();
i2p::data::IdentHash ih = ri.GetIdentHash();
i2p::data::IdentHash randomIdent;
// make floodfill lookups
while(numFloodfills > 0) {
randomIdent.Randomize();
auto msg = i2p::CreateRouterInfoDatabaseLookupMsg(randomIdent, ourIdent, 0, false);
requests.push_back(msg);
numFloodfills --;
}
// make regular router lookups
while(numRouters > 0) {
randomIdent.Randomize();
auto msg = i2p::CreateRouterInfoDatabaseLookupMsg(randomIdent, ourIdent, 0, true);
requests.push_back(msg);
numRouters --;
}
// send them off
i2p::transport::transports.SendMessages(ih, requests);
}
bool NetDb::LoadRouterInfo (const std::string& path, uint64_t ts)
{
auto r = std::make_shared<RouterInfo>(path);
if (r->GetRouterIdentity () && !r->IsUnreachable () && r->HasValidAddresses () &&
ts < r->GetTimestamp () + 24*60*60*NETDB_MAX_OFFLINE_EXPIRATION_TIMEOUT*1000LL) // too old
{
r->DeleteBuffer ();
if (m_RouterInfos.emplace (r->GetIdentHash (), r).second)
{
if (r->IsFloodfill () && r->IsEligibleFloodfill ())
m_Floodfills.Insert (r);
}
}
else
{
LogPrint(eLogWarning, "NetDb: RI from ", path, " is invalid or too old. Delete");
i2p::fs::Remove(path);
}
return true;
}
void NetDb::VisitLeaseSets(LeaseSetVisitor v)
{
std::lock_guard<std::mutex> lock(m_LeaseSetsMutex);
for ( auto & entry : m_LeaseSets)
v(entry.first, entry.second);
}
void NetDb::VisitStoredRouterInfos(RouterInfoVisitor v)
{
m_Storage.Iterate([v] (const std::string & filename)
{
auto ri = std::make_shared<i2p::data::RouterInfo>(filename);
v(ri);
});
}
void NetDb::VisitRouterInfos(RouterInfoVisitor v)
{
std::lock_guard<std::mutex> lock(m_RouterInfosMutex);
for ( const auto & item : m_RouterInfos )
v(item.second);
}
size_t NetDb::VisitRandomRouterInfos(RouterInfoFilter filter, RouterInfoVisitor v, size_t n)
{
std::vector<std::shared_ptr<const RouterInfo> > found;
const size_t max_iters_per_cyle = 3;
size_t iters = max_iters_per_cyle;
while(n > 0)
{
std::lock_guard<std::mutex> lock(m_RouterInfosMutex);
uint32_t idx = rand () % m_RouterInfos.size ();
uint32_t i = 0;
for (const auto & it : m_RouterInfos) {
if(i >= idx) // are we at the random start point?
{
// yes, check if we want this one
if(filter(it.second))
{
// we have a match
--n;
found.push_back(it.second);
// reset max iterations per cycle
iters = max_iters_per_cyle;
break;
}
}
else // not there yet
++i;
}
// we have enough
if(n == 0) break;
--iters;
// have we tried enough this cycle ?
if(!iters) {
// yes let's try the next cycle
--n;
iters = max_iters_per_cyle;
}
}
// visit the ones we found
size_t visited = 0;
for(const auto & ri : found ) {
v(ri);
++visited;
}
return visited;
}
void NetDb::Load ()
{
// make sure we cleanup netDb from previous attempts
m_RouterInfos.clear ();
m_Floodfills.Clear ();
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch();
std::vector<std::string> files;
m_Storage.Traverse(files);
for (const auto& path : files)
LoadRouterInfo (path, ts);
LogPrint (eLogInfo, "NetDb: ", m_RouterInfos.size(), " routers loaded (", m_Floodfills.GetSize (), " floodfils)");
}
void NetDb::SaveUpdated ()
{
int updatedCount = 0, deletedCount = 0, deletedFloodfillsCount = 0;
auto total = m_RouterInfos.size ();
auto totalFloodfills = m_Floodfills.GetSize ();
uint64_t expirationTimeout = NETDB_MAX_EXPIRATION_TIMEOUT*1000LL;
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch();
auto uptime = i2p::context.GetUptime ();
double minTunnelCreationSuccessRate;
i2p::config::GetOption("limits.zombies", minTunnelCreationSuccessRate);
bool isLowRate = i2p::tunnel::tunnels.GetPreciseTunnelCreationSuccessRate () < minTunnelCreationSuccessRate;
// routers don't expire if less than 90 or uptime is less than 1 hour
bool checkForExpiration = total > NETDB_MIN_ROUTERS && uptime > NETDB_CHECK_FOR_EXPIRATION_UPTIME; // 10 minutes
if (checkForExpiration && uptime > i2p::transport::SSU2_TO_INTRODUCER_SESSION_DURATION) // 1 hour
expirationTimeout = i2p::context.IsFloodfill () ? NETDB_FLOODFILL_EXPIRATION_TIMEOUT*1000LL :
NETDB_MIN_EXPIRATION_TIMEOUT*1000LL + (NETDB_MAX_EXPIRATION_TIMEOUT - NETDB_MIN_EXPIRATION_TIMEOUT)*1000LL*NETDB_MIN_ROUTERS/total;
auto own = i2p::context.GetSharedRouterInfo ();
for (auto& it: m_RouterInfos)
{
if (!it.second || it.second == own) continue; // skip own
std::string ident = it.second->GetIdentHashBase64();
if (it.second->IsUpdated ())
{
if (it.second->GetBuffer ())
{
// we have something to save
it.second->SaveToFile (m_Storage.Path(ident));
it.second->SetUnreachable (false);
std::lock_guard<std::mutex> l(m_RouterInfosMutex); // possible collision between DeleteBuffer and Update
it.second->DeleteBuffer ();
}
it.second->SetUpdated (false);
updatedCount++;
continue;
}
if (it.second->GetProfile ()->IsUnreachable ())
it.second->SetUnreachable (true);
// make router reachable back if too few routers or floodfills
if (it.second->IsUnreachable () && (total - deletedCount < NETDB_MIN_ROUTERS || isLowRate ||
(it.second->IsFloodfill () && totalFloodfills - deletedFloodfillsCount < NETDB_MIN_FLOODFILLS)))
it.second->SetUnreachable (false);
if (!it.second->IsUnreachable ())
{
// find & mark expired routers
if (!it.second->GetCompatibleTransports (true)) // non reachable by any transport
it.second->SetUnreachable (true);
else if (ts + NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL < it.second->GetTimestamp ())
{
LogPrint (eLogWarning, "NetDb: RouterInfo is from future for ", (it.second->GetTimestamp () - ts)/1000LL, " seconds");
it.second->SetUnreachable (true);
}
else if (checkForExpiration)
{
if (ts > it.second->GetTimestamp () + expirationTimeout)
it.second->SetUnreachable (true);
else if ((ts > it.second->GetTimestamp () + expirationTimeout/2) && // more than half of expiration
total > NETDB_NUM_ROUTERS_THRESHOLD && !it.second->IsHighBandwidth() && // low bandwidth
!it.second->IsFloodfill() && (!i2p::context.IsFloodfill () || // non floodfill
(CreateRoutingKey (it.second->GetIdentHash ()) ^ i2p::context.GetIdentHash ()).metric[0] >= 0x02)) // different first 7 bits
it.second->SetUnreachable (true);
}
}
// make router reachable back if connected now
if (it.second->IsUnreachable () && i2p::transport::transports.IsConnected (it.second->GetIdentHash ()))
it.second->SetUnreachable (false);
if (it.second->IsUnreachable ())
{
if (it.second->IsFloodfill ()) deletedFloodfillsCount++;
// delete RI file
m_Storage.Remove(ident);
deletedCount++;
if (total - deletedCount < NETDB_MIN_ROUTERS) checkForExpiration = false;
}
} // m_RouterInfos iteration
m_RouterInfoBuffersPool.CleanUpMt ();
m_RouterInfoAddressesPool.CleanUpMt ();
m_RouterInfoAddressVectorsPool.CleanUpMt ();
m_IdentitiesPool.CleanUpMt ();
if (updatedCount > 0)
LogPrint (eLogInfo, "NetDb: Saved ", updatedCount, " new/updated routers");
if (deletedCount > 0)
{
LogPrint (eLogInfo, "NetDb: Deleting ", deletedCount, " unreachable routers");
// clean up RouterInfos table
{
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
for (auto it = m_RouterInfos.begin (); it != m_RouterInfos.end ();)
{
if (!it->second || it->second->IsUnreachable ())
it = m_RouterInfos.erase (it);
else
{
it->second->DropProfile ();
it++;
}
}
}
// clean up expired floodfills or not floodfills anymore
{
std::lock_guard<std::mutex> l(m_FloodfillsMutex);
m_Floodfills.Cleanup ([](const std::shared_ptr<RouterInfo>& r)->bool
{
return r && r->IsFloodfill () && !r->IsUnreachable ();
});
}
}
}
void NetDb::RequestDestination (const IdentHash& destination, RequestedDestination::RequestComplete requestComplete, bool direct)
{
if (direct && i2p::transport::transports.RoutesRestricted ()) direct = false; // always use tunnels for restricted routes
auto dest = m_Requests->CreateRequest (destination, false, direct, requestComplete); // non-exploratory
if (!dest)
{
LogPrint (eLogWarning, "NetDb: Destination ", destination.ToBase64(), " is requested already or cached");
return;
}
auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ());
if (floodfill)
{
if (direct && !floodfill->IsReachableFrom (i2p::context.GetRouterInfo ()) &&
!i2p::transport::transports.IsConnected (floodfill->GetIdentHash ()))
direct = false; // floodfill can't be reached directly
if (direct)
{
if (CheckLogLevel (eLogDebug))
LogPrint (eLogDebug, "NetDb: Request ", dest->GetDestination ().ToBase64 (), " at ", floodfill->GetIdentHash ().ToBase64 (), " directly");
auto msg = dest->CreateRequestMessage (floodfill->GetIdentHash ());
msg->onDrop = [this, dest]() { if (dest->IsActive ()) this->m_Requests->SendNextRequest (dest); };
transports.SendMessage (floodfill->GetIdentHash (), msg);
}
else
{
auto pool = i2p::tunnel::tunnels.GetExploratoryPool ();
auto outbound = pool ? pool->GetNextOutboundTunnel (nullptr, floodfill->GetCompatibleTransports (false)) : nullptr;
auto inbound = pool ? pool->GetNextInboundTunnel (nullptr, floodfill->GetCompatibleTransports (true)) : nullptr;
if (outbound && inbound)
{
if (CheckLogLevel (eLogDebug))
LogPrint (eLogDebug, "NetDb: Request ", dest->GetDestination ().ToBase64 (), " at ", floodfill->GetIdentHash ().ToBase64 (), " through tunnels");
auto msg = dest->CreateRequestMessage (floodfill, inbound);
msg->onDrop = [this, dest]() { if (dest->IsActive ()) this->m_Requests->SendNextRequest (dest); };
outbound->SendTunnelDataMsgTo (floodfill->GetIdentHash (), 0,
i2p::garlic::WrapECIESX25519MessageForRouter (msg, floodfill->GetIdentity ()->GetEncryptionPublicKey ()));
}
else
{
LogPrint (eLogError, "NetDb: ", destination.ToBase64(), " destination requested, but no tunnels found");
m_Requests->RequestComplete (destination, nullptr);
}
}
}
else
{
LogPrint (eLogError, "NetDb: ", destination.ToBase64(), " destination requested, but no floodfills found");
m_Requests->RequestComplete (destination, nullptr);
}
}
void NetDb::RequestDestinationFrom (const IdentHash& destination, const IdentHash & from, bool exploratory, RequestedDestination::RequestComplete requestComplete)
{
auto dest = m_Requests->CreateRequest (destination, exploratory, true, requestComplete); // non-exploratory
if (!dest)
{
LogPrint (eLogWarning, "NetDb: Destination ", destination.ToBase64(), " is requested already");
return;
}
if (CheckLogLevel (eLogDebug))
LogPrint(eLogDebug, "NetDb: Destination ", destination.ToBase64(), " being requested directly from ", from.ToBase64());
// direct
transports.SendMessage (from, dest->CreateRequestMessage (nullptr, nullptr));
}
void NetDb::HandleNTCP2RouterInfoMsg (std::shared_ptr<const I2NPMessage> m)
{
uint8_t flood = m->GetPayload ()[0] & NTCP2_ROUTER_INFO_FLAG_REQUEST_FLOOD;
bool updated;
auto ri = AddRouterInfo (m->GetPayload () + 1, m->GetPayloadLength () - 1, updated); // without flags
if (flood && updated && context.IsFloodfill () && ri)
{
auto floodMsg = CreateDatabaseStoreMsg (ri, 0); // replyToken = 0
Flood (ri->GetIdentHash (), floodMsg);
}
}
void NetDb::HandleDatabaseStoreMsg (std::shared_ptr<const I2NPMessage> m)
{
const uint8_t * buf = m->GetPayload ();
size_t len = m->GetSize ();
if (len < DATABASE_STORE_HEADER_SIZE)
{
LogPrint (eLogError, "NetDb: Database store msg is too short ", len, ". Dropped");
return;
}
IdentHash ident (buf + DATABASE_STORE_KEY_OFFSET);
if (ident.IsZero ())
{
LogPrint (eLogDebug, "NetDb: Database store with zero ident, dropped");
return;
}
uint32_t replyToken = bufbe32toh (buf + DATABASE_STORE_REPLY_TOKEN_OFFSET);
size_t offset = DATABASE_STORE_HEADER_SIZE;
if (replyToken)
{
if (len < offset + 36) // 32 + 4
{
LogPrint (eLogError, "NetDb: Database store msg with reply token is too short ", len, ". Dropped");
return;
}
uint32_t tunnelID = bufbe32toh (buf + offset);
offset += 4;
if (replyToken != 0xFFFFFFFFU) // if not caught on OBEP or IBGW
{
IdentHash replyIdent(buf + offset);
auto deliveryStatus = CreateDeliveryStatusMsg (replyToken);
if (!tunnelID) // send response directly
transports.SendMessage (replyIdent, deliveryStatus);
else
{
bool direct = true;
if (!i2p::transport::transports.IsConnected (replyIdent))
{
auto r = FindRouter (replyIdent);
if (r && !r->IsReachableFrom (i2p::context.GetRouterInfo ()))
direct = false;
}
if (direct) // send response directly to IBGW
transports.SendMessage (replyIdent, i2p::CreateTunnelGatewayMsg (tunnelID, deliveryStatus));
else
{
// send response through exploratory tunnel
auto pool = i2p::tunnel::tunnels.GetExploratoryPool ();
auto outbound = pool ? pool->GetNextOutboundTunnel () : nullptr;
if (outbound)
outbound->SendTunnelDataMsgTo (replyIdent, tunnelID, deliveryStatus);
else
LogPrint (eLogWarning, "NetDb: No outbound tunnels for DatabaseStore reply found");
}
}
}
offset += 32;
}
// we must send reply back before this check
if (ident == i2p::context.GetIdentHash ())
{
LogPrint (eLogDebug, "NetDb: Database store with own RouterInfo received, dropped");
return;
}
size_t payloadOffset = offset;
bool updated = false;
uint8_t storeType = buf[DATABASE_STORE_TYPE_OFFSET];
if (storeType) // LeaseSet or LeaseSet2
{
if (len > MAX_LS_BUFFER_SIZE + offset)
{
LogPrint (eLogError, "NetDb: Database store message is too long ", len);
return;
}
if (!context.IsFloodfill ())
{
LogPrint (eLogInfo, "NetDb: Not Floodfill, LeaseSet store request ignored for ", ident.ToBase32());
return;
}
else if (!m->from) // unsolicited LS must be received directly
{
if (storeType == NETDB_STORE_TYPE_LEASESET) // 1
{
if (CheckLogLevel (eLogDebug))
LogPrint (eLogDebug, "NetDb: Store request: LeaseSet for ", ident.ToBase32());
updated = AddLeaseSet (ident, buf + offset, len - offset);
}
else // all others are considered as LeaseSet2
{
if (CheckLogLevel (eLogDebug))
LogPrint (eLogDebug, "NetDb: Store request: LeaseSet2 of type ", int(storeType), " for ", ident.ToBase32());
updated = AddLeaseSet2 (ident, buf + offset, len - offset, storeType);
}
}
}
else // RouterInfo
{
if (CheckLogLevel (eLogDebug))
LogPrint (eLogDebug, "NetDb: Store request: RouterInfo ", ident.ToBase64());
size_t size = bufbe16toh (buf + offset);
offset += 2;
if (size > MAX_RI_BUFFER_SIZE || size > len - offset)
{
LogPrint (eLogError, "NetDb: Invalid RouterInfo length ", (int)size);
return;
}
uint8_t uncompressed[MAX_RI_BUFFER_SIZE];
size_t uncompressedSize = m_Inflator.Inflate (buf + offset, size, uncompressed, MAX_RI_BUFFER_SIZE);
if (uncompressedSize && uncompressedSize < MAX_RI_BUFFER_SIZE)
updated = AddRouterInfo (ident, uncompressed, uncompressedSize);
else
{
LogPrint (eLogInfo, "NetDb: Decompression failed ", uncompressedSize);
return;
}
}
if (replyToken && context.IsFloodfill () && updated)
{
// flood updated
auto floodMsg = NewI2NPShortMessage ();
uint8_t * payload = floodMsg->GetPayload ();
memcpy (payload, buf, 33); // key + type
htobe32buf (payload + DATABASE_STORE_REPLY_TOKEN_OFFSET, 0); // zero reply token
size_t msgLen = len - payloadOffset;
floodMsg->len += DATABASE_STORE_HEADER_SIZE + msgLen;
if (floodMsg->len < floodMsg->maxLen)
{
memcpy (payload + DATABASE_STORE_HEADER_SIZE, buf + payloadOffset, msgLen);
floodMsg->FillI2NPMessageHeader (eI2NPDatabaseStore);
Flood (ident, floodMsg);
}
else
LogPrint (eLogError, "NetDb: Database store message is too long ", floodMsg->len);
}
}