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1353 lines
41 KiB
1353 lines
41 KiB
/* |
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* Copyright (c) 2013-2021, The PurpleI2P Project |
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* |
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* This file is part of Purple i2pd project and licensed under BSD3 |
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* |
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* See full license text in LICENSE file at top of project tree |
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*/ |
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#include <string.h> |
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#include <fstream> |
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#include <vector> |
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#include <boost/asio.hpp> |
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#include <stdexcept> |
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#include "I2PEndian.h" |
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#include "Base.h" |
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#include "Crypto.h" |
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#include "Log.h" |
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#include "Timestamp.h" |
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#include "I2NPProtocol.h" |
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#include "Tunnel.h" |
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#include "Transports.h" |
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#include "NTCP2.h" |
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#include "RouterContext.h" |
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#include "Garlic.h" |
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#include "ECIESX25519AEADRatchetSession.h" |
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#include "Config.h" |
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#include "NetDb.hpp" |
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#include "util.h" |
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using namespace i2p::transport; |
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namespace i2p |
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{ |
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namespace data |
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{ |
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NetDb netdb; |
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NetDb::NetDb (): m_IsRunning (false), m_Thread (nullptr), m_Reseeder (nullptr), m_Storage("netDb", "r", "routerInfo-", "dat"), m_PersistProfiles (true), m_HiddenMode(false) |
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{ |
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} |
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NetDb::~NetDb () |
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{ |
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Stop (); |
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delete m_Reseeder; |
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} |
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void NetDb::Start () |
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{ |
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m_Storage.SetPlace(i2p::fs::GetDataDir()); |
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m_Storage.Init(i2p::data::GetBase64SubstitutionTable(), 64); |
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InitProfilesStorage (); |
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m_Families.LoadCertificates (); |
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Load (); |
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uint16_t threshold; i2p::config::GetOption("reseed.threshold", threshold); |
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if (m_RouterInfos.size () < threshold) // reseed if # of router less than threshold |
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Reseed (); |
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else if (!GetRandomRouter (i2p::context.GetSharedRouterInfo (), false)) |
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Reseed (); // we don't have a router we can connect to. Trying to reseed |
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i2p::config::GetOption("persist.profiles", m_PersistProfiles); |
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m_IsRunning = true; |
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m_Thread = new std::thread (std::bind (&NetDb::Run, this)); |
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} |
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void NetDb::Stop () |
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{ |
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if (m_IsRunning) |
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{ |
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if (m_PersistProfiles) |
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for (auto& it: m_RouterInfos) |
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it.second->SaveProfile (); |
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DeleteObsoleteProfiles (); |
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m_RouterInfos.clear (); |
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m_Floodfills.clear (); |
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if (m_Thread) |
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{ |
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m_IsRunning = false; |
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m_Queue.WakeUp (); |
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m_Thread->join (); |
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delete m_Thread; |
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m_Thread = 0; |
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} |
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m_LeaseSets.clear(); |
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m_Requests.Stop (); |
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} |
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} |
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void NetDb::Run () |
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{ |
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i2p::util::SetThreadName("NetDB"); |
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uint32_t lastSave = 0, lastPublish = 0, lastExploratory = 0, lastManageRequest = 0, lastDestinationCleanup = 0; |
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while (m_IsRunning) |
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{ |
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try |
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{ |
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auto msg = m_Queue.GetNextWithTimeout (15000); // 15 sec |
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if (msg) |
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{ |
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int numMsgs = 0; |
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while (msg) |
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{ |
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LogPrint(eLogDebug, "NetDb: got request with type ", (int) msg->GetTypeID ()); |
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switch (msg->GetTypeID ()) |
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{ |
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case eI2NPDatabaseStore: |
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HandleDatabaseStoreMsg (msg); |
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break; |
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case eI2NPDatabaseSearchReply: |
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HandleDatabaseSearchReplyMsg (msg); |
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break; |
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case eI2NPDatabaseLookup: |
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HandleDatabaseLookupMsg (msg); |
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break; |
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case eI2NPDeliveryStatus: |
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HandleDeliveryStatusMsg (msg); |
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break; |
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case eI2NPDummyMsg: |
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// plain RouterInfo from NTCP2 with flags for now |
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HandleNTCP2RouterInfoMsg (msg); |
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break; |
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default: // WTF? |
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LogPrint (eLogError, "NetDb: unexpected message type ", (int) msg->GetTypeID ()); |
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//i2p::HandleI2NPMessage (msg); |
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} |
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if (numMsgs > 100) break; |
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msg = m_Queue.Get (); |
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numMsgs++; |
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} |
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} |
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if (!m_IsRunning) break; |
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if (!i2p::transport::transports.IsOnline ()) continue; // don't manage netdb when offline |
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uint64_t ts = i2p::util::GetSecondsSinceEpoch (); |
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if (ts - lastManageRequest >= 15) // manage requests every 15 seconds |
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{ |
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m_Requests.ManageRequests (); |
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lastManageRequest = ts; |
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} |
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if (ts - lastSave >= 60) // save routers, manage leasesets and validate subscriptions every minute |
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{ |
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if (lastSave) |
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{ |
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SaveUpdated (); |
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ManageLeaseSets (); |
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} |
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lastSave = ts; |
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} |
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if (ts - lastDestinationCleanup >= i2p::garlic::INCOMING_TAGS_EXPIRATION_TIMEOUT) |
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{ |
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i2p::context.CleanupDestination (); |
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lastDestinationCleanup = ts; |
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} |
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// publish |
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if (!m_HiddenMode && i2p::transport::transports.IsOnline ()) |
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{ |
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bool publish = false; |
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if (m_PublishReplyToken) |
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{ |
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if (ts - lastPublish >= NETDB_PUBLISH_CONFIRMATION_TIMEOUT) publish = true; |
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} |
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else if (i2p::context.GetLastUpdateTime () > lastPublish || |
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ts - lastPublish >= NETDB_PUBLISH_INTERVAL) publish = true; |
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if (publish) // update timestamp and publish |
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{ |
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i2p::context.UpdateTimestamp (ts); |
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Publish (); |
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lastPublish = ts; |
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} |
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} |
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if (ts - lastExploratory >= 30) // exploratory every 30 seconds |
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{ |
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auto numRouters = m_RouterInfos.size (); |
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if (!numRouters) |
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throw std::runtime_error("No known routers, reseed seems to be totally failed"); |
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else // we have peers now |
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m_FloodfillBootstrap = nullptr; |
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if (numRouters < 2500 || ts - lastExploratory >= 90) |
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{ |
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numRouters = 800/numRouters; |
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if (numRouters < 1) numRouters = 1; |
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if (numRouters > 9) numRouters = 9; |
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m_Requests.ManageRequests (); |
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if(!m_HiddenMode) |
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Explore (numRouters); |
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lastExploratory = ts; |
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} |
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} |
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} |
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catch (std::exception& ex) |
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{ |
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LogPrint (eLogError, "NetDb: runtime exception: ", ex.what ()); |
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} |
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} |
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} |
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void NetDb::SetHidden(bool hide) |
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{ |
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// TODO: remove reachable addresses from router info |
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m_HiddenMode = hide; |
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} |
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bool NetDb::AddRouterInfo (const uint8_t * buf, int len) |
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{ |
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bool updated; |
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AddRouterInfo (buf, len, updated); |
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return updated; |
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} |
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std::shared_ptr<const RouterInfo> NetDb::AddRouterInfo (const uint8_t * buf, int len, bool& updated) |
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{ |
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IdentityEx identity; |
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if (identity.FromBuffer (buf, len)) |
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return AddRouterInfo (identity.GetIdentHash (), buf, len, updated); |
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updated = false; |
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return nullptr; |
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} |
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bool NetDb::AddRouterInfo (const IdentHash& ident, const uint8_t * buf, int len) |
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{ |
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bool updated; |
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AddRouterInfo (ident, buf, len, updated); |
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return updated; |
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} |
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std::shared_ptr<const RouterInfo> NetDb::AddRouterInfo (const IdentHash& ident, const uint8_t * buf, int len, bool& updated) |
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{ |
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updated = true; |
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auto r = FindRouter (ident); |
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if (r) |
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{ |
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if (r->IsNewer (buf, len)) |
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{ |
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bool wasFloodfill = r->IsFloodfill (); |
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r->Update (buf, len); |
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LogPrint (eLogInfo, "NetDb: RouterInfo updated: ", ident.ToBase64()); |
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if (wasFloodfill != r->IsFloodfill ()) // if floodfill status updated |
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{ |
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LogPrint (eLogDebug, "NetDb: RouterInfo floodfill status updated: ", ident.ToBase64()); |
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std::unique_lock<std::mutex> l(m_FloodfillsMutex); |
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if (wasFloodfill) |
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m_Floodfills.remove (r); |
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else if (r->IsEligibleFloodfill ()) |
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m_Floodfills.push_back (r); |
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} |
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} |
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else |
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{ |
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LogPrint (eLogDebug, "NetDb: RouterInfo is older: ", ident.ToBase64()); |
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updated = false; |
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} |
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} |
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else |
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{ |
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r = std::make_shared<RouterInfo> (buf, len); |
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if (!r->IsUnreachable () && r->HasValidAddresses ()) |
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{ |
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bool inserted = false; |
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{ |
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std::unique_lock<std::mutex> l(m_RouterInfosMutex); |
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inserted = m_RouterInfos.insert ({r->GetIdentHash (), r}).second; |
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} |
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if (inserted) |
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{ |
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LogPrint (eLogInfo, "NetDb: RouterInfo added: ", ident.ToBase64()); |
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if (r->IsFloodfill () && r->IsEligibleFloodfill ()) |
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{ |
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std::unique_lock<std::mutex> l(m_FloodfillsMutex); |
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m_Floodfills.push_back (r); |
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} |
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} |
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else |
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{ |
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LogPrint (eLogWarning, "NetDb: Duplicated RouterInfo ", ident.ToBase64()); |
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updated = false; |
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} |
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} |
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else |
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updated = false; |
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} |
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// take care about requested destination |
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m_Requests.RequestComplete (ident, r); |
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return r; |
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} |
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bool NetDb::AddLeaseSet (const IdentHash& ident, const uint8_t * buf, int len) |
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{ |
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std::unique_lock<std::mutex> lock(m_LeaseSetsMutex); |
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bool updated = false; |
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auto it = m_LeaseSets.find(ident); |
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if (it != m_LeaseSets.end () && it->second->GetStoreType () == i2p::data::NETDB_STORE_TYPE_LEASESET) |
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{ |
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// we update only is existing LeaseSet is not LeaseSet2 |
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uint64_t expires; |
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if(LeaseSetBufferValidate(buf, len, expires)) |
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{ |
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if(it->second->GetExpirationTime() < expires) |
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{ |
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it->second->Update (buf, len, false); // signature is verified already |
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LogPrint (eLogInfo, "NetDb: LeaseSet updated: ", ident.ToBase32()); |
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updated = true; |
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} |
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else |
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LogPrint(eLogDebug, "NetDb: LeaseSet is older: ", ident.ToBase32()); |
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} |
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else |
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LogPrint(eLogError, "NetDb: LeaseSet is invalid: ", ident.ToBase32()); |
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} |
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else |
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{ |
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auto leaseSet = std::make_shared<LeaseSet> (buf, len, false); // we don't need leases in netdb |
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if (leaseSet->IsValid ()) |
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{ |
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LogPrint (eLogInfo, "NetDb: LeaseSet added: ", ident.ToBase32()); |
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m_LeaseSets[ident] = leaseSet; |
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updated = true; |
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} |
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else |
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LogPrint (eLogError, "NetDb: new LeaseSet validation failed: ", ident.ToBase32()); |
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} |
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return updated; |
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} |
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bool NetDb::AddLeaseSet2 (const IdentHash& ident, const uint8_t * buf, int len, uint8_t storeType) |
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{ |
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std::unique_lock<std::mutex> lock(m_LeaseSetsMutex); |
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auto leaseSet = std::make_shared<LeaseSet2> (storeType, buf, len, false); // we don't need leases in netdb |
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if (leaseSet->IsValid ()) |
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{ |
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auto it = m_LeaseSets.find(ident); |
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if (it == m_LeaseSets.end () || it->second->GetStoreType () != storeType || |
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leaseSet->GetPublishedTimestamp () > it->second->GetPublishedTimestamp ()) |
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{ |
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if (leaseSet->IsPublic () && !leaseSet->IsExpired ()) |
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{ |
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// TODO: implement actual update |
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LogPrint (eLogInfo, "NetDb: LeaseSet2 updated: ", ident.ToBase32()); |
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m_LeaseSets[ident] = leaseSet; |
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return true; |
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} |
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else |
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{ |
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LogPrint (eLogWarning, "NetDb: Unpublished or expired LeaseSet2 received: ", ident.ToBase32()); |
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m_LeaseSets.erase (ident); |
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} |
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} |
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} |
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else |
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LogPrint (eLogError, "NetDb: new LeaseSet2 validation failed: ", ident.ToBase32()); |
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return false; |
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} |
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std::shared_ptr<RouterInfo> NetDb::FindRouter (const IdentHash& ident) const |
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{ |
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std::unique_lock<std::mutex> l(m_RouterInfosMutex); |
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auto it = m_RouterInfos.find (ident); |
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if (it != m_RouterInfos.end ()) |
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return it->second; |
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else |
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return nullptr; |
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} |
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std::shared_ptr<LeaseSet> NetDb::FindLeaseSet (const IdentHash& destination) const |
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{ |
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std::unique_lock<std::mutex> lock(m_LeaseSetsMutex); |
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auto it = m_LeaseSets.find (destination); |
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if (it != m_LeaseSets.end ()) |
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return it->second; |
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else |
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return nullptr; |
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} |
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std::shared_ptr<RouterProfile> NetDb::FindRouterProfile (const IdentHash& ident) const |
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{ |
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if (!m_PersistProfiles) |
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return nullptr; |
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auto router = FindRouter (ident); |
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return router ? router->GetProfile () : nullptr; |
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} |
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void NetDb::SetUnreachable (const IdentHash& ident, bool unreachable) |
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{ |
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auto it = m_RouterInfos.find (ident); |
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if (it != m_RouterInfos.end ()) |
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return it->second->SetUnreachable (unreachable); |
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} |
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void NetDb::Reseed () |
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{ |
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if (!m_Reseeder) |
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{ |
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m_Reseeder = new Reseeder (); |
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m_Reseeder->LoadCertificates (); // we need certificates for SU3 verification |
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} |
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// try reseeding from floodfill first if specified |
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std::string riPath; |
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if(i2p::config::GetOption("reseed.floodfill", riPath)) { |
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auto ri = std::make_shared<RouterInfo>(riPath); |
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if (ri->IsFloodfill()) { |
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const uint8_t * riData = ri->GetBuffer(); |
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int riLen = ri->GetBufferLen(); |
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if(!i2p::data::netdb.AddRouterInfo(riData, riLen)) { |
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// bad router info |
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LogPrint(eLogError, "NetDb: bad router info"); |
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return; |
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} |
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m_FloodfillBootstrap = ri; |
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ReseedFromFloodfill(*ri); |
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// don't try reseed servers if trying to bootstrap from floodfill |
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return; |
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} |
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} |
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m_Reseeder->Bootstrap (); |
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} |
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void NetDb::ReseedFromFloodfill(const RouterInfo & ri, int numRouters, int numFloodfills) |
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{ |
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LogPrint(eLogInfo, "NetDB: reseeding from floodfill ", ri.GetIdentHashBase64()); |
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std::vector<std::shared_ptr<i2p::I2NPMessage> > requests; |
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i2p::data::IdentHash ourIdent = i2p::context.GetIdentHash(); |
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i2p::data::IdentHash ih = ri.GetIdentHash(); |
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i2p::data::IdentHash randomIdent; |
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// make floodfill lookups |
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while(numFloodfills > 0) { |
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randomIdent.Randomize(); |
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auto msg = i2p::CreateRouterInfoDatabaseLookupMsg(randomIdent, ourIdent, 0, false); |
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requests.push_back(msg); |
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numFloodfills --; |
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} |
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// make regular router lookups |
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while(numRouters > 0) { |
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randomIdent.Randomize(); |
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auto msg = i2p::CreateRouterInfoDatabaseLookupMsg(randomIdent, ourIdent, 0, true); |
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requests.push_back(msg); |
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numRouters --; |
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} |
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// send them off |
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i2p::transport::transports.SendMessages(ih, requests); |
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} |
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bool NetDb::LoadRouterInfo (const std::string & path) |
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{ |
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auto r = std::make_shared<RouterInfo>(path); |
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if (r->GetRouterIdentity () && !r->IsUnreachable () && |
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(r->IsReachable () || !r->IsSSU (false) || m_LastLoad < r->GetTimestamp () + NETDB_INTRODUCEE_EXPIRATION_TIMEOUT*1000LL)) // 1 hour |
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{ |
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r->DeleteBuffer (); |
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r->ClearProperties (); // properties are not used for regular routers |
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m_RouterInfos[r->GetIdentHash ()] = r; |
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if (r->IsFloodfill () && r->IsReachable ()) // floodfill must be reachable |
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m_Floodfills.push_back (r); |
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} |
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else |
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{ |
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LogPrint(eLogWarning, "NetDb: RI from ", path, " is invalid. Delete"); |
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i2p::fs::Remove(path); |
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} |
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return true; |
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} |
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void NetDb::VisitLeaseSets(LeaseSetVisitor v) |
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{ |
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std::unique_lock<std::mutex> lock(m_LeaseSetsMutex); |
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for ( auto & entry : m_LeaseSets) |
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v(entry.first, entry.second); |
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} |
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void NetDb::VisitStoredRouterInfos(RouterInfoVisitor v) |
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{ |
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m_Storage.Iterate([v] (const std::string & filename) |
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{ |
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auto ri = std::make_shared<i2p::data::RouterInfo>(filename); |
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v(ri); |
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}); |
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} |
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void NetDb::VisitRouterInfos(RouterInfoVisitor v) |
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{ |
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std::unique_lock<std::mutex> lock(m_RouterInfosMutex); |
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for ( const auto & item : m_RouterInfos ) |
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v(item.second); |
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} |
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size_t NetDb::VisitRandomRouterInfos(RouterInfoFilter filter, RouterInfoVisitor v, size_t n) |
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{ |
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std::vector<std::shared_ptr<const RouterInfo> > found; |
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const size_t max_iters_per_cyle = 3; |
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size_t iters = max_iters_per_cyle; |
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while(n > 0) |
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{ |
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std::unique_lock<std::mutex> lock(m_RouterInfosMutex); |
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uint32_t idx = rand () % m_RouterInfos.size (); |
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uint32_t i = 0; |
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for (const auto & it : m_RouterInfos) { |
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if(i >= idx) // are we at the random start point? |
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{ |
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// yes, check if we want this one |
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if(filter(it.second)) |
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{ |
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// we have a match |
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--n; |
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found.push_back(it.second); |
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// reset max iterations per cycle |
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iters = max_iters_per_cyle; |
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break; |
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} |
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} |
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else // not there yet |
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++i; |
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} |
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// we have enough |
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if(n == 0) break; |
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--iters; |
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// have we tried enough this cycle ? |
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if(!iters) { |
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// yes let's try the next cycle |
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--n; |
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iters = max_iters_per_cyle; |
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} |
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} |
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// visit the ones we found |
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size_t visited = 0; |
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for(const auto & ri : found ) { |
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v(ri); |
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++visited; |
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} |
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return visited; |
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} |
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void NetDb::Load () |
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{ |
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// make sure we cleanup netDb from previous attempts |
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m_RouterInfos.clear (); |
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m_Floodfills.clear (); |
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m_LastLoad = i2p::util::GetSecondsSinceEpoch(); |
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std::vector<std::string> files; |
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m_Storage.Traverse(files); |
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for (const auto& path : files) |
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LoadRouterInfo(path); |
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LogPrint (eLogInfo, "NetDb: ", m_RouterInfos.size(), " routers loaded (", m_Floodfills.size (), " floodfils)"); |
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} |
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void NetDb::SaveUpdated () |
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{ |
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int updatedCount = 0, deletedCount = 0; |
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auto total = m_RouterInfos.size (); |
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uint64_t expirationTimeout = NETDB_MAX_EXPIRATION_TIMEOUT*1000LL; |
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch(); |
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auto uptime = i2p::context.GetUptime (); |
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// routers don't expire if less than 90 or uptime is less than 1 hour |
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bool checkForExpiration = total > NETDB_MIN_ROUTERS && uptime > 600; // 10 minutes |
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if (checkForExpiration && uptime > 3600) // 1 hour |
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expirationTimeout = i2p::context.IsFloodfill () ? NETDB_FLOODFILL_EXPIRATION_TIMEOUT*1000LL : |
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NETDB_MIN_EXPIRATION_TIMEOUT*1000LL + (NETDB_MAX_EXPIRATION_TIMEOUT - NETDB_MIN_EXPIRATION_TIMEOUT)*1000LL*NETDB_MIN_ROUTERS/total; |
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|
|
for (auto& it: m_RouterInfos) |
|
{ |
|
std::string ident = it.second->GetIdentHashBase64(); |
|
std::string path = m_Storage.Path(ident); |
|
if (it.second->IsUpdated ()) |
|
{ |
|
it.second->SaveToFile (path); |
|
it.second->SetUpdated (false); |
|
it.second->SetUnreachable (false); |
|
it.second->DeleteBuffer (); |
|
updatedCount++; |
|
continue; |
|
} |
|
// make router reachable back if too few routers |
|
if (it.second->IsUnreachable () && total - deletedCount < NETDB_MIN_ROUTERS) |
|
it.second->SetUnreachable (false); |
|
// find & mark expired routers |
|
if (!it.second->IsReachable () && it.second->IsSSU (false)) |
|
{ |
|
if (ts > it.second->GetTimestamp () + NETDB_INTRODUCEE_EXPIRATION_TIMEOUT*1000LL) |
|
// RouterInfo expires after 1 hour if uses introducer |
|
it.second->SetUnreachable (true); |
|
} |
|
else if (checkForExpiration && ts > it.second->GetTimestamp () + expirationTimeout) |
|
it.second->SetUnreachable (true); |
|
|
|
if (it.second->IsUnreachable ()) |
|
{ |
|
// delete RI file |
|
m_Storage.Remove(ident); |
|
deletedCount++; |
|
if (total - deletedCount < NETDB_MIN_ROUTERS) checkForExpiration = false; |
|
} |
|
} // m_RouterInfos iteration |
|
|
|
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::unique_lock<std::mutex> l(m_RouterInfosMutex); |
|
for (auto it = m_RouterInfos.begin (); it != m_RouterInfos.end ();) |
|
{ |
|
if (it->second->IsUnreachable ()) |
|
{ |
|
if (m_PersistProfiles) it->second->SaveProfile (); |
|
it = m_RouterInfos.erase (it); |
|
continue; |
|
} |
|
++it; |
|
} |
|
} |
|
// clean up expired floodfills or not floodfills anymore |
|
{ |
|
std::unique_lock<std::mutex> l(m_FloodfillsMutex); |
|
for (auto it = m_Floodfills.begin (); it != m_Floodfills.end ();) |
|
if ((*it)->IsUnreachable () || !(*it)->IsFloodfill ()) |
|
it = m_Floodfills.erase (it); |
|
else |
|
++it; |
|
} |
|
} |
|
} |
|
|
|
void NetDb::RequestDestination (const IdentHash& destination, RequestedDestination::RequestComplete requestComplete, bool direct) |
|
{ |
|
auto dest = m_Requests.CreateRequest (destination, false, requestComplete); // non-exploratory |
|
if (!dest) |
|
{ |
|
LogPrint (eLogWarning, "NetDb: destination ", destination.ToBase64(), " is requested already"); |
|
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) |
|
transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ())); |
|
else |
|
{ |
|
auto pool = i2p::tunnel::tunnels.GetExploratoryPool (); |
|
auto outbound = pool ? pool->GetNextOutboundTunnel () : nullptr; |
|
auto inbound = pool ? pool->GetNextInboundTunnel () : nullptr; |
|
if (outbound && inbound) |
|
outbound->SendTunnelDataMsg (floodfill->GetIdentHash (), 0, dest->CreateRequestMessage (floodfill, inbound)); |
|
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 exploritory, RequestedDestination::RequestComplete requestComplete) |
|
{ |
|
|
|
auto dest = m_Requests.CreateRequest (destination, exploritory, requestComplete); // non-exploratory |
|
if (!dest) |
|
{ |
|
LogPrint (eLogWarning, "NetDb: destination ", destination.ToBase64(), " is requested already"); |
|
return; |
|
} |
|
LogPrint(eLogInfo, "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 (); |
|
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) |
|
{ |
|
auto deliveryStatus = CreateDeliveryStatusMsg (replyToken); |
|
uint32_t tunnelID = bufbe32toh (buf + offset); |
|
offset += 4; |
|
if (!tunnelID) // send response directly |
|
transports.SendMessage (buf + offset, deliveryStatus); |
|
else |
|
{ |
|
auto pool = i2p::tunnel::tunnels.GetExploratoryPool (); |
|
auto outbound = pool ? pool->GetNextOutboundTunnel () : nullptr; |
|
if (outbound) |
|
outbound->SendTunnelDataMsg (buf + offset, 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 (!m->from) // unsolicited LS must be received directly |
|
{ |
|
if (storeType == NETDB_STORE_TYPE_LEASESET) // 1 |
|
{ |
|
LogPrint (eLogDebug, "NetDb: store request: LeaseSet for ", ident.ToBase32()); |
|
updated = AddLeaseSet (ident, buf + offset, len - offset); |
|
} |
|
else // all others are considered as LeaseSet2 |
|
{ |
|
LogPrint (eLogDebug, "NetDb: store request: LeaseSet2 of type ", storeType, " for ", ident.ToBase32()); |
|
updated = AddLeaseSet2 (ident, buf + offset, len - offset, storeType); |
|
} |
|
} |
|
} |
|
else // RouterInfo |
|
{ |
|
LogPrint (eLogDebug, "NetDb: store request: RouterInfo"); |
|
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); |
|
} |
|
} |
|
|
|
void NetDb::HandleDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg) |
|
{ |
|
const uint8_t * buf = msg->GetPayload (); |
|
char key[48]; |
|
int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48); |
|
key[l] = 0; |
|
int num = buf[32]; // num |
|
LogPrint (eLogDebug, "NetDb: DatabaseSearchReply for ", key, " num=", num); |
|
IdentHash ident (buf); |
|
auto dest = m_Requests.FindRequest (ident); |
|
if (dest) |
|
{ |
|
bool deleteDest = true; |
|
if (num > 0) |
|
{ |
|
auto pool = i2p::tunnel::tunnels.GetExploratoryPool (); |
|
auto outbound = pool ? pool->GetNextOutboundTunnel () : nullptr; |
|
auto inbound = pool ? pool->GetNextInboundTunnel () : nullptr; |
|
if (!dest->IsExploratory ()) |
|
{ |
|
// reply to our destination. Try other floodfills |
|
if (outbound && inbound) |
|
{ |
|
auto count = dest->GetExcludedPeers ().size (); |
|
if (count < 7) |
|
{ |
|
auto nextFloodfill = GetClosestFloodfill (dest->GetDestination (), dest->GetExcludedPeers ()); |
|
if (nextFloodfill) |
|
{ |
|
// request destination |
|
LogPrint (eLogDebug, "NetDb: Try ", key, " at ", count, " floodfill ", nextFloodfill->GetIdentHash ().ToBase64 ()); |
|
outbound->SendTunnelDataMsg (nextFloodfill->GetIdentHash (), 0, |
|
dest->CreateRequestMessage (nextFloodfill, inbound)); |
|
deleteDest = false; |
|
} |
|
} |
|
else |
|
LogPrint (eLogWarning, "NetDb: ", key, " was not found on ", count, " floodfills"); |
|
} |
|
} |
|
|
|
if (deleteDest) |
|
// no more requests for the destinationation. delete it |
|
m_Requests.RequestComplete (ident, nullptr); |
|
} |
|
else |
|
// no more requests for destination possible. delete it |
|
m_Requests.RequestComplete (ident, nullptr); |
|
} |
|
else if(!m_FloodfillBootstrap) |
|
LogPrint (eLogWarning, "NetDb: requested destination for ", key, " not found"); |
|
|
|
// try responses |
|
for (int i = 0; i < num; i++) |
|
{ |
|
const uint8_t * router = buf + 33 + i*32; |
|
char peerHash[48]; |
|
int l1 = i2p::data::ByteStreamToBase64 (router, 32, peerHash, 48); |
|
peerHash[l1] = 0; |
|
LogPrint (eLogDebug, "NetDb: ", i, ": ", peerHash); |
|
|
|
auto r = FindRouter (router); |
|
if (!r || i2p::util::GetMillisecondsSinceEpoch () > r->GetTimestamp () + 3600*1000LL) |
|
{ |
|
// router with ident not found or too old (1 hour) |
|
LogPrint (eLogDebug, "NetDb: found new/outdated router. Requesting RouterInfo ..."); |
|
if(m_FloodfillBootstrap) |
|
RequestDestinationFrom(router, m_FloodfillBootstrap->GetIdentHash(), true); |
|
else |
|
RequestDestination (router); |
|
} |
|
else |
|
LogPrint (eLogDebug, "NetDb: [:|||:]"); |
|
} |
|
} |
|
|
|
void NetDb::HandleDatabaseLookupMsg (std::shared_ptr<const I2NPMessage> msg) |
|
{ |
|
const uint8_t * buf = msg->GetPayload (); |
|
IdentHash ident (buf); |
|
if (ident.IsZero ()) |
|
{ |
|
LogPrint (eLogError, "NetDb: DatabaseLookup for zero ident. Ignored"); |
|
return; |
|
} |
|
char key[48]; |
|
int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48); |
|
key[l] = 0; |
|
|
|
IdentHash replyIdent(buf + 32); |
|
uint8_t flag = buf[64]; |
|
|
|
|
|
LogPrint (eLogDebug, "NetDb: DatabaseLookup for ", key, " received flags=", (int)flag); |
|
uint8_t lookupType = flag & DATABASE_LOOKUP_TYPE_FLAGS_MASK; |
|
const uint8_t * excluded = buf + 65; |
|
uint32_t replyTunnelID = 0; |
|
if (flag & DATABASE_LOOKUP_DELIVERY_FLAG) //reply to tunnel |
|
{ |
|
replyTunnelID = bufbe32toh (excluded); |
|
excluded += 4; |
|
} |
|
uint16_t numExcluded = bufbe16toh (excluded); |
|
excluded += 2; |
|
if (numExcluded > 512) |
|
{ |
|
LogPrint (eLogWarning, "NetDb: number of excluded peers", numExcluded, " exceeds 512"); |
|
return; |
|
} |
|
|
|
std::shared_ptr<I2NPMessage> replyMsg; |
|
if (lookupType == DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP) |
|
{ |
|
LogPrint (eLogInfo, "NetDb: exploratory close to ", key, " ", numExcluded, " excluded"); |
|
std::set<IdentHash> excludedRouters; |
|
for (int i = 0; i < numExcluded; i++) |
|
{ |
|
excludedRouters.insert (excluded); |
|
excluded += 32; |
|
} |
|
std::vector<IdentHash> routers; |
|
for (int i = 0; i < 3; i++) |
|
{ |
|
auto r = GetClosestNonFloodfill (ident, excludedRouters); |
|
if (r) |
|
{ |
|
routers.push_back (r->GetIdentHash ()); |
|
excludedRouters.insert (r->GetIdentHash ()); |
|
} |
|
} |
|
replyMsg = CreateDatabaseSearchReply (ident, routers); |
|
} |
|
else |
|
{ |
|
if (lookupType == DATABASE_LOOKUP_TYPE_ROUTERINFO_LOOKUP || |
|
lookupType == DATABASE_LOOKUP_TYPE_NORMAL_LOOKUP) |
|
{ |
|
auto router = FindRouter (ident); |
|
if (router) |
|
{ |
|
LogPrint (eLogDebug, "NetDb: requested RouterInfo ", key, " found"); |
|
router->LoadBuffer (); |
|
if (router->GetBuffer ()) |
|
replyMsg = CreateDatabaseStoreMsg (router); |
|
} |
|
} |
|
|
|
if (!replyMsg && (lookupType == DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP || |
|
lookupType == DATABASE_LOOKUP_TYPE_NORMAL_LOOKUP)) |
|
{ |
|
auto leaseSet = FindLeaseSet (ident); |
|
if (!leaseSet) |
|
{ |
|
// no lease set found |
|
LogPrint(eLogDebug, "NetDb: requested LeaseSet not found for ", ident.ToBase32()); |
|
} |
|
else if (!leaseSet->IsExpired ()) // we don't send back our LeaseSets |
|
{ |
|
LogPrint (eLogDebug, "NetDb: requested LeaseSet ", key, " found"); |
|
replyMsg = CreateDatabaseStoreMsg (ident, leaseSet); |
|
} |
|
} |
|
|
|
if (!replyMsg) |
|
{ |
|
std::set<IdentHash> excludedRouters; |
|
const uint8_t * exclude_ident = excluded; |
|
for (int i = 0; i < numExcluded; i++) |
|
{ |
|
excludedRouters.insert (exclude_ident); |
|
exclude_ident += 32; |
|
} |
|
auto closestFloodfills = GetClosestFloodfills (ident, 3, excludedRouters, true); |
|
if (closestFloodfills.empty ()) |
|
LogPrint (eLogWarning, "NetDb: Requested ", key, " not found, ", numExcluded, " peers excluded"); |
|
replyMsg = CreateDatabaseSearchReply (ident, closestFloodfills); |
|
} |
|
} |
|
excluded += numExcluded * 32; |
|
if (replyMsg) |
|
{ |
|
if (replyTunnelID) |
|
{ |
|
// encryption might be used though tunnel only |
|
if (flag & (DATABASE_LOOKUP_ENCRYPTION_FLAG | DATABASE_LOOKUP_ECIES_FLAG)) // encrypted reply requested |
|
{ |
|
const uint8_t * sessionKey = excluded; |
|
const uint8_t numTags = excluded[32]; |
|
if (numTags) |
|
{ |
|
if (flag & DATABASE_LOOKUP_ECIES_FLAG) |
|
{ |
|
uint64_t tag; |
|
memcpy (&tag, excluded + 33, 8); |
|
replyMsg = i2p::garlic::WrapECIESX25519Message (replyMsg, sessionKey, tag); |
|
} |
|
else |
|
{ |
|
const i2p::garlic::SessionTag sessionTag(excluded + 33); // take first tag |
|
i2p::garlic::ElGamalAESSession garlic (sessionKey, sessionTag); |
|
replyMsg = garlic.WrapSingleMessage (replyMsg); |
|
} |
|
if (!replyMsg) |
|
LogPrint (eLogError, "NetDb: failed to wrap message"); |
|
} |
|
else |
|
LogPrint(eLogWarning, "NetDb: encrypted reply requested but no tags provided"); |
|
} |
|
auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool (); |
|
auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr; |
|
if (outbound) |
|
outbound->SendTunnelDataMsg (replyIdent, replyTunnelID, replyMsg); |
|
else |
|
transports.SendMessage (replyIdent, i2p::CreateTunnelGatewayMsg (replyTunnelID, replyMsg)); |
|
} |
|
else |
|
transports.SendMessage (replyIdent, replyMsg); |
|
} |
|
} |
|
|
|
void NetDb::HandleDeliveryStatusMsg (std::shared_ptr<const I2NPMessage> msg) |
|
{ |
|
if (m_PublishReplyToken == bufbe32toh (msg->GetPayload () + DELIVERY_STATUS_MSGID_OFFSET)) |
|
{ |
|
LogPrint (eLogInfo, "NetDb: Publishing confirmed. reply token=", m_PublishReplyToken); |
|
m_PublishExcluded.clear (); |
|
m_PublishReplyToken = 0; |
|
} |
|
} |
|
|
|
void NetDb::Explore (int numDestinations) |
|
{ |
|
// new requests |
|
auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool (); |
|
auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr; |
|
auto inbound = exploratoryPool ? exploratoryPool->GetNextInboundTunnel () : nullptr; |
|
bool throughTunnels = outbound && inbound; |
|
|
|
uint8_t randomHash[32]; |
|
std::vector<i2p::tunnel::TunnelMessageBlock> msgs; |
|
LogPrint (eLogInfo, "NetDb: exploring new ", numDestinations, " routers ..."); |
|
for (int i = 0; i < numDestinations; i++) |
|
{ |
|
RAND_bytes (randomHash, 32); |
|
auto dest = m_Requests.CreateRequest (randomHash, true); // exploratory |
|
if (!dest) |
|
{ |
|
LogPrint (eLogWarning, "NetDb: exploratory destination is requested already"); |
|
return; |
|
} |
|
auto floodfill = GetClosestFloodfill (randomHash, dest->GetExcludedPeers ()); |
|
if (floodfill) |
|
{ |
|
if (i2p::transport::transports.IsConnected (floodfill->GetIdentHash ())) |
|
throughTunnels = false; |
|
if (throughTunnels) |
|
{ |
|
msgs.push_back (i2p::tunnel::TunnelMessageBlock |
|
{ |
|
i2p::tunnel::eDeliveryTypeRouter, |
|
floodfill->GetIdentHash (), 0, |
|
CreateDatabaseStoreMsg () // tell floodfill about us |
|
}); |
|
msgs.push_back (i2p::tunnel::TunnelMessageBlock |
|
{ |
|
i2p::tunnel::eDeliveryTypeRouter, |
|
floodfill->GetIdentHash (), 0, |
|
dest->CreateRequestMessage (floodfill, inbound) // explore |
|
}); |
|
} |
|
else |
|
i2p::transport::transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ())); |
|
} |
|
else |
|
m_Requests.RequestComplete (randomHash, nullptr); |
|
} |
|
if (throughTunnels && msgs.size () > 0) |
|
outbound->SendTunnelDataMsg (msgs); |
|
} |
|
|
|
void NetDb::Publish () |
|
{ |
|
i2p::context.UpdateStats (); // for floodfill |
|
|
|
if (m_PublishExcluded.size () > NETDB_MAX_PUBLISH_EXCLUDED_FLOODFILLS) |
|
{ |
|
LogPrint (eLogError, "NetDb: Couldn't publish our RouterInfo to ", NETDB_MAX_PUBLISH_EXCLUDED_FLOODFILLS, " closest routers. Try again"); |
|
m_PublishExcluded.clear (); |
|
} |
|
|
|
auto floodfill = GetClosestFloodfill (i2p::context.GetIdentHash (), m_PublishExcluded); |
|
if (floodfill) |
|
{ |
|
uint32_t replyToken; |
|
RAND_bytes ((uint8_t *)&replyToken, 4); |
|
LogPrint (eLogInfo, "NetDb: Publishing our RouterInfo to ", i2p::data::GetIdentHashAbbreviation(floodfill->GetIdentHash ()), ". reply token=", replyToken); |
|
m_PublishExcluded.insert (floodfill->GetIdentHash ()); |
|
m_PublishReplyToken = replyToken; |
|
if (floodfill->IsReachableFrom (i2p::context.GetRouterInfo ()) || // are we able to connect? |
|
i2p::transport::transports.IsConnected (floodfill->GetIdentHash ())) // already connected ? |
|
// send directly |
|
transports.SendMessage (floodfill->GetIdentHash (), CreateDatabaseStoreMsg (i2p::context.GetSharedRouterInfo (), replyToken)); |
|
else |
|
{ |
|
// otherwise through exploratory |
|
auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool (); |
|
auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr; |
|
auto inbound = exploratoryPool ? exploratoryPool->GetNextInboundTunnel () : nullptr; |
|
if (inbound && outbound) |
|
outbound->SendTunnelDataMsg (floodfill->GetIdentHash (), 0, |
|
CreateDatabaseStoreMsg (i2p::context.GetSharedRouterInfo (), replyToken, inbound)); |
|
} |
|
} |
|
} |
|
|
|
void NetDb::Flood (const IdentHash& ident, std::shared_ptr<I2NPMessage> floodMsg) |
|
{ |
|
std::set<IdentHash> excluded; |
|
excluded.insert (i2p::context.GetIdentHash ()); // don't flood to itself |
|
excluded.insert (ident); // don't flood back |
|
for (int i = 0; i < 3; i++) |
|
{ |
|
auto floodfill = GetClosestFloodfill (ident, excluded); |
|
if (floodfill) |
|
{ |
|
auto h = floodfill->GetIdentHash(); |
|
LogPrint(eLogDebug, "NetDb: Flood lease set for ", ident.ToBase32(), " to ", h.ToBase64()); |
|
transports.SendMessage (h, CopyI2NPMessage(floodMsg)); |
|
excluded.insert (h); |
|
} |
|
else |
|
break; |
|
} |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetRandomRouter () const |
|
{ |
|
return GetRandomRouter ( |
|
[](std::shared_ptr<const RouterInfo> router)->bool |
|
{ |
|
return !router->IsHidden (); |
|
}); |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse) const |
|
{ |
|
return GetRandomRouter ( |
|
[compatibleWith, reverse](std::shared_ptr<const RouterInfo> router)->bool |
|
{ |
|
return !router->IsHidden () && router != compatibleWith && |
|
(reverse ? compatibleWith->IsReachableFrom (*router) : |
|
router->IsReachableFrom (*compatibleWith)); |
|
}); |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetRandomPeerTestRouter (bool v4, const std::set<IdentHash>& excluded) const |
|
{ |
|
return GetRandomRouter ( |
|
[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool |
|
{ |
|
return !router->IsHidden () && router->IsPeerTesting (v4) && |
|
!excluded.count (router->GetIdentHash ()); |
|
}); |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetRandomSSUV6Router () const |
|
{ |
|
return GetRandomRouter ( |
|
[](std::shared_ptr<const RouterInfo> router)->bool |
|
{ |
|
return !router->IsHidden () && router->IsSSUV6 (); |
|
}); |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetRandomIntroducer (bool v4, const std::set<IdentHash>& excluded) const |
|
{ |
|
return GetRandomRouter ( |
|
[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool |
|
{ |
|
return router->IsIntroducer (v4) && !excluded.count (router->GetIdentHash ()) && |
|
!router->IsHidden () && !router->IsFloodfill (); // floodfills don't send relay tag |
|
}); |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetHighBandwidthRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse) const |
|
{ |
|
return GetRandomRouter ( |
|
[compatibleWith, reverse](std::shared_ptr<const RouterInfo> router)->bool |
|
{ |
|
return !router->IsHidden () && router != compatibleWith && |
|
(reverse ? compatibleWith->IsReachableFrom (*router) : |
|
router->IsReachableFrom (*compatibleWith)) && |
|
(router->GetCaps () & RouterInfo::eHighBandwidth) && |
|
#if defined(__x86_64__) |
|
router->GetVersion () >= NETDB_MIN_HIGHBANDWIDTH_VERSION; |
|
#else |
|
router->GetIdentity ()->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD; |
|
#endif |
|
}); |
|
} |
|
|
|
template<typename Filter> |
|
std::shared_ptr<const RouterInfo> NetDb::GetRandomRouter (Filter filter) const |
|
{ |
|
if (m_RouterInfos.empty()) |
|
return 0; |
|
uint32_t ind = rand () % m_RouterInfos.size (); |
|
for (int j = 0; j < 2; j++) |
|
{ |
|
uint32_t i = 0; |
|
std::unique_lock<std::mutex> l(m_RouterInfosMutex); |
|
for (const auto& it: m_RouterInfos) |
|
{ |
|
if (i >= ind) |
|
{ |
|
if (!it.second->IsUnreachable () && filter (it.second)) |
|
return it.second; |
|
} |
|
else |
|
i++; |
|
} |
|
// we couldn't find anything, try second pass |
|
ind = 0; |
|
} |
|
return nullptr; // seems we have too few routers |
|
} |
|
|
|
void NetDb::PostI2NPMsg (std::shared_ptr<const I2NPMessage> msg) |
|
{ |
|
if (msg) m_Queue.Put (msg); |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetClosestFloodfill (const IdentHash& destination, |
|
const std::set<IdentHash>& excluded, bool closeThanUsOnly) const |
|
{ |
|
std::shared_ptr<const RouterInfo> r; |
|
XORMetric minMetric; |
|
IdentHash destKey = CreateRoutingKey (destination); |
|
if (closeThanUsOnly) |
|
minMetric = destKey ^ i2p::context.GetIdentHash (); |
|
else |
|
minMetric.SetMax (); |
|
std::unique_lock<std::mutex> l(m_FloodfillsMutex); |
|
for (const auto& it: m_Floodfills) |
|
{ |
|
if (!it->IsUnreachable ()) |
|
{ |
|
XORMetric m = destKey ^ it->GetIdentHash (); |
|
if (m < minMetric && !excluded.count (it->GetIdentHash ())) |
|
{ |
|
minMetric = m; |
|
r = it; |
|
} |
|
} |
|
} |
|
return r; |
|
} |
|
|
|
std::vector<IdentHash> NetDb::GetClosestFloodfills (const IdentHash& destination, size_t num, |
|
std::set<IdentHash>& excluded, bool closeThanUsOnly) const |
|
{ |
|
struct Sorted |
|
{ |
|
std::shared_ptr<const RouterInfo> r; |
|
XORMetric metric; |
|
bool operator< (const Sorted& other) const { return metric < other.metric; }; |
|
}; |
|
|
|
std::set<Sorted> sorted; |
|
IdentHash destKey = CreateRoutingKey (destination); |
|
XORMetric ourMetric; |
|
if (closeThanUsOnly) ourMetric = destKey ^ i2p::context.GetIdentHash (); |
|
{ |
|
std::unique_lock<std::mutex> l(m_FloodfillsMutex); |
|
for (const auto& it: m_Floodfills) |
|
{ |
|
if (!it->IsUnreachable ()) |
|
{ |
|
XORMetric m = destKey ^ it->GetIdentHash (); |
|
if (closeThanUsOnly && ourMetric < m) continue; |
|
if (sorted.size () < num) |
|
sorted.insert ({it, m}); |
|
else if (m < sorted.rbegin ()->metric) |
|
{ |
|
sorted.insert ({it, m}); |
|
sorted.erase (std::prev (sorted.end ())); |
|
} |
|
} |
|
} |
|
} |
|
|
|
std::vector<IdentHash> res; |
|
size_t i = 0; |
|
for (const auto& it: sorted) |
|
{ |
|
if (i < num) |
|
{ |
|
const auto& ident = it.r->GetIdentHash (); |
|
if (!excluded.count (ident)) |
|
{ |
|
res.push_back (ident); |
|
i++; |
|
} |
|
} |
|
else |
|
break; |
|
} |
|
return res; |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetRandomRouterInFamily(const std::string & fam) const { |
|
return GetRandomRouter( |
|
[fam](std::shared_ptr<const RouterInfo> router)->bool |
|
{ |
|
return router->IsFamily(fam); |
|
}); |
|
} |
|
|
|
std::shared_ptr<const RouterInfo> NetDb::GetClosestNonFloodfill (const IdentHash& destination, |
|
const std::set<IdentHash>& excluded) const |
|
{ |
|
std::shared_ptr<const RouterInfo> r; |
|
XORMetric minMetric; |
|
IdentHash destKey = CreateRoutingKey (destination); |
|
minMetric.SetMax (); |
|
// must be called from NetDb thread only |
|
for (const auto& it: m_RouterInfos) |
|
{ |
|
if (!it.second->IsFloodfill ()) |
|
{ |
|
XORMetric m = destKey ^ it.first; |
|
if (m < minMetric && !excluded.count (it.first)) |
|
{ |
|
minMetric = m; |
|
r = it.second; |
|
} |
|
} |
|
} |
|
return r; |
|
} |
|
|
|
void NetDb::ManageLeaseSets () |
|
{ |
|
auto ts = i2p::util::GetMillisecondsSinceEpoch (); |
|
for (auto it = m_LeaseSets.begin (); it != m_LeaseSets.end ();) |
|
{ |
|
if (!it->second->IsValid () || ts > it->second->GetExpirationTime () - LEASE_ENDDATE_THRESHOLD) |
|
{ |
|
LogPrint (eLogInfo, "NetDb: LeaseSet ", it->first.ToBase64 (), " expired or invalid"); |
|
it = m_LeaseSets.erase (it); |
|
} |
|
else |
|
++it; |
|
} |
|
} |
|
} |
|
}
|
|
|