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i2pd/libi2pd/NetDb.cpp
orignal e74272781f moved exploratory to netdb requests thread
2024-05-22 18:29:40 -04:00

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/*
* 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;
uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), lastObsoleteProfilesCleanup = lastProfilesCleanup;
int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 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 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 >= 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;
}
}
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 ()
{
if (m_PersistingRouters.valid ())
{
if (m_PersistingRouters.wait_for(std::chrono::seconds(0)) == std::future_status::ready)
m_PersistingRouters.get ();
else
{
LogPrint (eLogWarning, "NetDb: Can't save updated routers. Routers are being saved to disk");
return;
}
}
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;
std::list<std::pair<std::string, std::shared_ptr<RouterInfo::Buffer> > > saveToDisk;
std::list<std::string> removeFromDisk;
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
std::shared_ptr<RouterInfo::Buffer> buffer;
{
std::lock_guard<std::mutex> l(m_RouterInfosMutex); // possible collision between DeleteBuffer and Update
buffer = it.second->GetSharedBuffer ();
it.second->DeleteBuffer ();
}
if (buffer && !it.second->IsUnreachable ()) // don't save bad router
saveToDisk.push_back(std::make_pair(ident, buffer));
it.second->SetUnreachable (false);
}
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
removeFromDisk.push_back (ident);
deletedCount++;
if (total - deletedCount < NETDB_MIN_ROUTERS) checkForExpiration = false;
}
} // m_RouterInfos iteration
if (!saveToDisk.empty () || !removeFromDisk.empty ())
{
m_PersistingRouters = std::async (std::launch::async, &NetDb::PersistRouters,
this, std::move (saveToDisk), std::move (removeFromDisk));
}
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::PersistRouters (std::list<std::pair<std::string, std::shared_ptr<RouterInfo::Buffer> > >&& update,
std::list<std::string>&& remove)
{
for (auto it: update)
RouterInfo::SaveToFile (m_Storage.Path(it.first), it.second);
for (auto it: remove)
m_Storage.Remove (it);
}
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
if (m_Requests)
m_Requests->PostRequestDestination (destination, requestComplete, direct);
else
LogPrint (eLogError, "NetDb: Requests is null");
}
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);
}
}
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 || (excluded - buf) + numExcluded*32 > (int)msg->GetPayloadLength ())
{
LogPrint (eLogWarning, "NetDb: Number of excluded peers", numExcluded, " is too much");
return;
}
std::shared_ptr<I2NPMessage> replyMsg;
if (lookupType == DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP)
{
if (!context.IsFloodfill ())
{
LogPrint (eLogWarning, "NetDb: Exploratory lookup to non-floodfill dropped");
return;
}
LogPrint (eLogInfo, "NetDb: Exploratory close to ", key, " ", numExcluded, " excluded");
std::unordered_set<IdentHash> excludedRouters;
const uint8_t * excluded_ident = excluded;
for (int i = 0; i < numExcluded; i++)
{
excludedRouters.insert (excluded_ident);
excluded_ident += 32;
}
replyMsg = CreateDatabaseSearchReply (ident, GetExploratoryNonFloodfill (ident,
NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES, excludedRouters));
}
else
{
if (lookupType == DATABASE_LOOKUP_TYPE_ROUTERINFO_LOOKUP ||
lookupType == DATABASE_LOOKUP_TYPE_NORMAL_LOOKUP)
{
// try to find router
auto router = FindRouter (ident);
if (router && !router->IsUnreachable ())
{
LogPrint (eLogDebug, "NetDb: Requested RouterInfo ", key, " found");
if (PopulateRouterInfoBuffer (router))
replyMsg = CreateDatabaseStoreMsg (router);
}
}
if (!replyMsg && (lookupType == DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP ||
lookupType == DATABASE_LOOKUP_TYPE_NORMAL_LOOKUP))
{
// try to find leaseset
if (context.IsFloodfill ())
{
auto leaseSet = FindLeaseSet (ident);
if (!leaseSet)
{
// no leaseset found
LogPrint(eLogDebug, "NetDb: Requested LeaseSet not found for ", ident.ToBase32());
}
else if (!leaseSet->IsExpired ()) // we don't send back expired leasesets
{
LogPrint (eLogDebug, "NetDb: Requested LeaseSet ", key, " found");
replyMsg = CreateDatabaseStoreMsg (ident, leaseSet);
}
}
else if (lookupType == DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP)
{
LogPrint (eLogWarning, "NetDb: Explicit LeaseSet lookup to non-floodfill dropped");
return;
}
}
if (!replyMsg)
{
std::unordered_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, false);
if (closestFloodfills.empty ())
LogPrint (eLogWarning, "NetDb: No more floodfills for ", key, " 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");
}
bool direct = true;
if (!i2p::transport::transports.IsConnected (replyIdent))
{
auto r = FindRouter (replyIdent);
if (r && !r->IsReachableFrom (i2p::context.GetRouterInfo ()))
direct = false;
}
if (direct)
transports.SendMessage (replyIdent, i2p::CreateTunnelGatewayMsg (replyTunnelID, replyMsg));
else
{
auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool ();
auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr;
if (outbound)
outbound->SendTunnelDataMsgTo (replyIdent, replyTunnelID, replyMsg);
else
LogPrint (eLogWarning, "NetDb: Can't send lookup reply to ", replyIdent.ToBase64 (), ". Non reachable and no outbound tunnels");
}
}
else
transports.SendMessage (replyIdent, replyMsg);
}
}
void NetDb::Flood (const IdentHash& ident, std::shared_ptr<I2NPMessage> floodMsg)
{
std::unordered_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, bool endpoint) const
{
return GetRandomRouter (
[compatibleWith, reverse, endpoint](std::shared_ptr<const RouterInfo> router)->bool
{
return !router->IsHidden () && router != compatibleWith &&
(reverse ? (compatibleWith->IsReachableFrom (*router) && router->GetCompatibleTransports (true)):
router->IsReachableFrom (*compatibleWith)) && !router->IsNAT2NATOnly (*compatibleWith) &&
router->IsECIES () && !router->IsHighCongestion (false) &&
(!endpoint || (router->IsV4 () && (!reverse || router->IsPublished (true)))); // endpoint must be ipv4 and published if inbound(reverse)
});
}
std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2PeerTestRouter (bool v4, const std::unordered_set<IdentHash>& excluded) const
{
return GetRandomRouter (
[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool
{
return !router->IsHidden () && router->IsECIES () &&
router->IsSSU2PeerTesting (v4) && !excluded.count (router->GetIdentHash ());
});
}
std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2Introducer (bool v4, const std::unordered_set<IdentHash>& excluded) const
{
return GetRandomRouter (
[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool
{
return !router->IsHidden () && router->IsSSU2Introducer (v4) &&
!excluded.count (router->GetIdentHash ());
});
}
std::shared_ptr<const RouterInfo> NetDb::GetHighBandwidthRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith,
bool reverse, bool endpoint) const
{
bool checkIsReal = i2p::tunnel::tunnels.GetPreciseTunnelCreationSuccessRate () < NETDB_TUNNEL_CREATION_RATE_THRESHOLD && // too low rate
context.GetUptime () > NETDB_CHECK_FOR_EXPIRATION_UPTIME; // after 10 minutes uptime
return GetRandomRouter (
[compatibleWith, reverse, endpoint, checkIsReal](std::shared_ptr<const RouterInfo> router)->bool
{
return !router->IsHidden () && router != compatibleWith &&
(reverse ? (compatibleWith->IsReachableFrom (*router) && router->GetCompatibleTransports (true)) :
router->IsReachableFrom (*compatibleWith)) && !router->IsNAT2NATOnly (*compatibleWith) &&
(router->GetCaps () & RouterInfo::eHighBandwidth) &&
router->GetVersion () >= NETDB_MIN_HIGHBANDWIDTH_VERSION &&
router->IsECIES () && !router->IsHighCongestion (true) &&
(!checkIsReal || router->GetProfile ()->IsReal ()) &&
(!endpoint || (router->IsV4 () && (!reverse || router->IsPublished (true)))); // endpoint must be ipv4 and published if inbound(reverse)
});
}
template<typename Filter>
std::shared_ptr<const RouterInfo> NetDb::GetRandomRouter (Filter filter) const
{
if (m_RouterInfos.empty())
return nullptr;
uint16_t inds[3];
RAND_bytes ((uint8_t *)inds, sizeof (inds));
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
auto count = m_RouterInfos.size ();
if(count == 0) return nullptr;
inds[0] %= count;
auto it = m_RouterInfos.begin ();
std::advance (it, inds[0]);
// try random router
if (it != m_RouterInfos.end () && !it->second->IsUnreachable () && filter (it->second))
return it->second;
// try some routers around
auto it1 = m_RouterInfos.begin ();
if (inds[0])
{
// before
inds[1] %= inds[0];
std::advance (it1, (inds[1] + inds[0])/2);
}
else
it1 = it;
auto it2 = it;
if (inds[0] < m_RouterInfos.size () - 1)
{
// after
inds[2] %= (m_RouterInfos.size () - 1 - inds[0]); inds[2] /= 2;
std::advance (it2, inds[2]);
}
// it1 - from, it2 - to
it = it1;
while (it != it2 && it != m_RouterInfos.end ())
{
if (!it->second->IsUnreachable () && filter (it->second))
return it->second;
it++;
}
// still not found, try from the beginning
it = m_RouterInfos.begin ();
while (it != it1 && it != m_RouterInfos.end ())
{
if (!it->second->IsUnreachable () && filter (it->second))
return it->second;
it++;
}
// still not found, try to the beginning
it = it2;
while (it != m_RouterInfos.end ())
{
if (!it->second->IsUnreachable () && filter (it->second))
return it->second;
it++;
}
return nullptr; // seems we have too few routers
}
void NetDb::PostI2NPMsg (std::shared_ptr<const I2NPMessage> msg)
{
if (msg) m_Queue.Put (msg);
}
void NetDb::PostDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg)
{
if (msg && m_Requests)
m_Requests->PostDatabaseSearchReplyMsg (msg);
}
std::shared_ptr<const RouterInfo> NetDb::GetClosestFloodfill (const IdentHash& destination,
const std::unordered_set<IdentHash>& excluded) const
{
IdentHash destKey = CreateRoutingKey (destination);
std::lock_guard<std::mutex> l(m_FloodfillsMutex);
return m_Floodfills.FindClosest (destKey, [&excluded](const std::shared_ptr<RouterInfo>& r)->bool
{
return r && !r->IsUnreachable () && !r->GetProfile ()->IsUnreachable () &&
!excluded.count (r->GetIdentHash ());
});
}
std::vector<IdentHash> NetDb::GetClosestFloodfills (const IdentHash& destination, size_t num,
std::unordered_set<IdentHash>& excluded, bool closeThanUsOnly) const
{
std::vector<IdentHash> res;
IdentHash destKey = CreateRoutingKey (destination);
std::vector<std::shared_ptr<RouterInfo> > v;
{
std::lock_guard<std::mutex> l(m_FloodfillsMutex);
v = m_Floodfills.FindClosest (destKey, num, [&excluded](const std::shared_ptr<RouterInfo>& r)->bool
{
return r && !r->IsUnreachable () && !r->GetProfile ()->IsUnreachable () &&
!excluded.count (r->GetIdentHash ());
});
}
if (v.empty ()) return res;
XORMetric ourMetric;
if (closeThanUsOnly) ourMetric = destKey ^ i2p::context.GetIdentHash ();
for (auto& it: v)
{
if (closeThanUsOnly && ourMetric < (destKey ^ it->GetIdentHash ())) break;
res.push_back (it->GetIdentHash ());
}
return res;
}
std::shared_ptr<const RouterInfo> NetDb::GetRandomRouterInFamily (FamilyID fam) const
{
return GetRandomRouter(
[fam](std::shared_ptr<const RouterInfo> router)->bool
{
return router->IsFamily(fam);
});
}
std::vector<IdentHash> NetDb::GetExploratoryNonFloodfill (const IdentHash& destination,
size_t num, const std::unordered_set<IdentHash>& excluded)
{
std::vector<IdentHash> ret;
if (!num || m_RouterInfos.empty ()) return ret; // empty list
auto ts = i2p::util::GetMonotonicSeconds ();
if (ts > m_LastExploratorySelectionUpdateTime + NETDB_EXPLORATORY_SELECTION_UPDATE_INTERVAL)
{
// update selection
m_ExploratorySelection.clear ();
#if (__cplusplus >= 201703L) // C++ 17 or higher
std::vector<std::shared_ptr<const RouterInfo> > eligible;
eligible.reserve (m_RouterInfos.size ());
#else
auto& eligible = m_ExploratorySelection;
#endif
{
// collect eligible from current netdb
bool checkIsReal = i2p::tunnel::tunnels.GetPreciseTunnelCreationSuccessRate () < NETDB_TUNNEL_CREATION_RATE_THRESHOLD; // too low rate
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
for (const auto& it: m_RouterInfos)
if (!it.second->IsDeclaredFloodfill () &&
(!checkIsReal || (it.second->HasProfile () && it.second->GetProfile ()->IsReal ())))
eligible.push_back (it.second);
}
#if (__cplusplus >= 201703L) // C++ 17 or higher
if (eligible.size () > NETDB_MAX_EXPLORATORY_SELECTION_SIZE)
{
std::sample (eligible.begin(), eligible.end(), std::back_inserter(m_ExploratorySelection),
NETDB_MAX_EXPLORATORY_SELECTION_SIZE, std::mt19937(ts));
}
else
std::swap (m_ExploratorySelection, eligible);
#else
if (m_ExploratorySelection.size () > NETDB_MAX_EXPLORATORY_SELECTION_SIZE)
{
// reduce number of eligible to max selection size
std::shuffle (m_ExploratorySelection.begin(), m_ExploratorySelection.end(), std::mt19937(ts));
m_ExploratorySelection.resize (NETDB_MAX_EXPLORATORY_SELECTION_SIZE);
}
#endif
m_LastExploratorySelectionUpdateTime = ts;
}
// sort by distance
IdentHash destKey = CreateRoutingKey (destination);
std::map<XORMetric, std::shared_ptr<const RouterInfo> > sorted;
for (const auto& it: m_ExploratorySelection)
if (!excluded.count (it->GetIdentHash ()))
sorted.emplace (destKey ^ it->GetIdentHash (), it);
// return first num closest routers
for (const auto& it: sorted)
{
ret.push_back (it.second->GetIdentHash ());
if (ret.size () >= num) break;
}
return ret;
}
void NetDb::ManageRouterInfos ()
{
auto ts = i2p::util::GetSecondsSinceEpoch ();
{
std::lock_guard<std::mutex> l(m_RouterInfosMutex);
for (auto& it: m_RouterInfos)
it.second->UpdateIntroducers (ts);
}
SaveUpdated ();
}
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;
}
m_LeasesPool.CleanUpMt ();
}
bool NetDb::PopulateRouterInfoBuffer (std::shared_ptr<RouterInfo> r)
{
if (!r) return false;
if (r->GetBuffer ()) return true;
return r->LoadBuffer (m_Storage.Path (r->GetIdentHashBase64 ()));
}
}
}
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