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I2P: End-to-End encrypted and anonymous Internet
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299 lines
9.0 KiB
299 lines
9.0 KiB
/* |
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* Copyright (c) 2013-2024, 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 "Log.h" |
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#include "I2NPProtocol.h" |
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#include "Transports.h" |
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#include "NetDb.hpp" |
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#include "NetDbRequests.h" |
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#include "ECIESX25519AEADRatchetSession.h" |
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namespace i2p |
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{ |
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namespace data |
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{ |
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RequestedDestination::RequestedDestination (const IdentHash& destination, bool isExploratory, bool direct): |
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m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), m_IsActive (true), |
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m_CreationTime (i2p::util::GetSecondsSinceEpoch ()), m_LastRequestTime (0) |
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{ |
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} |
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RequestedDestination::~RequestedDestination () |
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{ |
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if (m_RequestComplete) m_RequestComplete (nullptr); |
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} |
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std::shared_ptr<I2NPMessage> RequestedDestination::CreateRequestMessage (std::shared_ptr<const RouterInfo> router, |
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std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel) |
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{ |
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std::lock_guard<std::mutex> l (m_ExcludedPeersMutex); |
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std::shared_ptr<I2NPMessage> msg; |
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if(replyTunnel) |
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msg = i2p::CreateRouterInfoDatabaseLookupMsg (m_Destination, |
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replyTunnel->GetNextIdentHash (), replyTunnel->GetNextTunnelID (), m_IsExploratory, |
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&m_ExcludedPeers); |
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else |
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msg = i2p::CreateRouterInfoDatabaseLookupMsg(m_Destination, i2p::context.GetIdentHash(), 0, m_IsExploratory, &m_ExcludedPeers); |
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if(router) |
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m_ExcludedPeers.insert (router->GetIdentHash ()); |
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m_LastRequestTime = i2p::util::GetSecondsSinceEpoch (); |
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return msg; |
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} |
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std::shared_ptr<I2NPMessage> RequestedDestination::CreateRequestMessage (const IdentHash& floodfill) |
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{ |
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std::lock_guard<std::mutex> l (m_ExcludedPeersMutex); |
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auto msg = i2p::CreateRouterInfoDatabaseLookupMsg (m_Destination, |
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i2p::context.GetRouterInfo ().GetIdentHash () , 0, false, &m_ExcludedPeers); |
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m_ExcludedPeers.insert (floodfill); |
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m_LastRequestTime = i2p::util::GetSecondsSinceEpoch (); |
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return msg; |
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} |
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bool RequestedDestination::IsExcluded (const IdentHash& ident) const |
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{ |
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std::lock_guard<std::mutex> l (m_ExcludedPeersMutex); |
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return m_ExcludedPeers.count (ident); |
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} |
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void RequestedDestination::ClearExcludedPeers () |
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{ |
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std::lock_guard<std::mutex> l (m_ExcludedPeersMutex); |
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m_ExcludedPeers.clear (); |
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} |
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std::set<IdentHash> RequestedDestination::GetExcludedPeers () const |
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{ |
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std::lock_guard<std::mutex> l (m_ExcludedPeersMutex); |
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return m_ExcludedPeers; |
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} |
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size_t RequestedDestination::GetNumExcludedPeers () const |
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{ |
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std::lock_guard<std::mutex> l (m_ExcludedPeersMutex); |
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return m_ExcludedPeers.size (); |
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} |
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void RequestedDestination::Success (std::shared_ptr<RouterInfo> r) |
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{ |
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if (m_IsActive) |
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{ |
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m_IsActive = false; |
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if (m_RequestComplete) |
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{ |
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m_RequestComplete (r); |
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m_RequestComplete = nullptr; |
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} |
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} |
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} |
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void RequestedDestination::Fail () |
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{ |
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if (m_IsActive) |
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{ |
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m_IsActive = false; |
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if (m_RequestComplete) |
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{ |
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m_RequestComplete (nullptr); |
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m_RequestComplete = nullptr; |
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} |
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} |
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} |
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void NetDbRequests::Start () |
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{ |
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m_LastPoolCleanUpTime = i2p::util::GetSecondsSinceEpoch (); |
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} |
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void NetDbRequests::Stop () |
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{ |
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m_RequestedDestinations.clear (); |
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m_RequestedDestinationsPool.CleanUpMt (); |
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} |
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std::shared_ptr<RequestedDestination> NetDbRequests::CreateRequest (const IdentHash& destination, |
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bool isExploratory, bool direct, RequestedDestination::RequestComplete requestComplete) |
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{ |
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// request RouterInfo directly |
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auto dest = m_RequestedDestinationsPool.AcquireSharedMt (destination, isExploratory, direct); |
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dest->SetRequestComplete (requestComplete); |
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{ |
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std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex); |
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auto ret = m_RequestedDestinations.emplace (destination, dest); |
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if (!ret.second) // not inserted |
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{ |
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dest->SetRequestComplete (nullptr); // don't call requestComplete in destructor |
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dest = ret.first->second; // existing one |
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if (requestComplete && dest->IsActive ()) |
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{ |
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auto prev = dest->GetRequestComplete (); |
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if (prev) // if already set |
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dest->SetRequestComplete ( |
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[requestComplete, prev](std::shared_ptr<RouterInfo> r) |
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{ |
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prev (r); // call previous |
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requestComplete (r); // then new |
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}); |
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else |
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dest->SetRequestComplete (requestComplete); |
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} |
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return nullptr; |
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} |
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} |
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return dest; |
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} |
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void NetDbRequests::RequestComplete (const IdentHash& ident, std::shared_ptr<RouterInfo> r) |
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{ |
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std::shared_ptr<RequestedDestination> request; |
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{ |
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std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex); |
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auto it = m_RequestedDestinations.find (ident); |
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if (it != m_RequestedDestinations.end ()) |
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{ |
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request = it->second; |
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if (request->IsExploratory ()) |
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m_RequestedDestinations.erase (it); |
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// otherwise cache for a while |
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} |
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} |
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if (request) |
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{ |
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if (r) |
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request->Success (r); |
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else |
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request->Fail (); |
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} |
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} |
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std::shared_ptr<RequestedDestination> NetDbRequests::FindRequest (const IdentHash& ident) const |
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{ |
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std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex); |
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auto it = m_RequestedDestinations.find (ident); |
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if (it != m_RequestedDestinations.end ()) |
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return it->second; |
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return nullptr; |
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} |
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void NetDbRequests::ManageRequests () |
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{ |
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uint64_t ts = i2p::util::GetSecondsSinceEpoch (); |
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if (ts > m_LastPoolCleanUpTime + REQUESTED_DESTINATIONS_POOL_CLEANUP_INTERVAL) |
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{ |
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m_RequestedDestinationsPool.CleanUpMt (); |
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m_LastPoolCleanUpTime = ts; |
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} |
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std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex); |
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for (auto it = m_RequestedDestinations.begin (); it != m_RequestedDestinations.end ();) |
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{ |
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auto& dest = it->second; |
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if (dest->IsActive () || ts < dest->GetCreationTime () + REQUEST_CACHE_TIME) |
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{ |
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if (!dest->IsExploratory ()) |
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{ |
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// regular request |
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bool done = false; |
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if (ts < dest->GetCreationTime () + MAX_REQUEST_TIME) |
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{ |
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if (ts > dest->GetLastRequestTime () + MIN_REQUEST_TIME) // try next floodfill if no response after min interval |
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done = !SendNextRequest (dest); |
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} |
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else // request is expired |
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done = true; |
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if (done) |
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dest->Fail (); |
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it++; |
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} |
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else |
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{ |
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// exploratory |
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if (ts >= dest->GetCreationTime () + MAX_EXPLORATORY_REQUEST_TIME) |
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{ |
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dest->Fail (); |
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it = m_RequestedDestinations.erase (it); // delete expired exploratory request right a way |
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} |
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else |
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it++; |
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} |
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} |
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else |
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it = m_RequestedDestinations.erase (it); |
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} |
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} |
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bool NetDbRequests::SendNextRequest (std::shared_ptr<RequestedDestination> dest) |
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{ |
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if (!dest || !dest->IsActive ()) return false; |
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bool ret = true; |
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auto count = dest->GetNumExcludedPeers (); |
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if (!dest->IsExploratory () && count < MAX_NUM_REQUEST_ATTEMPTS) |
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{ |
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auto nextFloodfill = netdb.GetClosestFloodfill (dest->GetDestination (), dest->GetExcludedPeers ()); |
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if (nextFloodfill) |
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{ |
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bool direct = dest->IsDirect (); |
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if (direct && !nextFloodfill->IsReachableFrom (i2p::context.GetRouterInfo ()) && |
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!i2p::transport::transports.IsConnected (nextFloodfill->GetIdentHash ())) |
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direct = false; // floodfill can't be reached directly |
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if (direct) |
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{ |
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if (CheckLogLevel (eLogDebug)) |
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LogPrint (eLogDebug, "NetDbReq: Try ", dest->GetDestination ().ToBase64 (), " at ", count, " floodfill ", nextFloodfill->GetIdentHash ().ToBase64 (), " directly"); |
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auto msg = dest->CreateRequestMessage (nextFloodfill->GetIdentHash ()); |
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auto s = shared_from_this (); |
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msg->onDrop = [s, dest]() { if (dest->IsActive ()) s->SendNextRequest (dest); }; |
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i2p::transport::transports.SendMessage (nextFloodfill->GetIdentHash (), msg); |
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} |
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else |
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{ |
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auto pool = i2p::tunnel::tunnels.GetExploratoryPool (); |
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if (pool) |
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{ |
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auto outbound = pool->GetNextOutboundTunnel (); |
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auto inbound = pool->GetNextInboundTunnel (); |
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if (nextFloodfill && outbound && inbound) |
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{ |
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if (CheckLogLevel (eLogDebug)) |
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LogPrint (eLogDebug, "NetDbReq: Try ", dest->GetDestination ().ToBase64 (), " at ", count, " floodfill ", nextFloodfill->GetIdentHash ().ToBase64 (), " through tunnels"); |
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auto msg = dest->CreateRequestMessage (nextFloodfill, inbound); |
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auto s = shared_from_this (); |
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msg->onDrop = [s, dest]() { if (dest->IsActive ()) s->SendNextRequest (dest); }; |
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outbound->SendTunnelDataMsgTo (nextFloodfill->GetIdentHash (), 0, |
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i2p::garlic::WrapECIESX25519MessageForRouter (msg, nextFloodfill->GetIdentity ()->GetEncryptionPublicKey ())); |
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} |
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else |
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{ |
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ret = false; |
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if (!inbound) LogPrint (eLogWarning, "NetDbReq: No inbound tunnels"); |
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if (!outbound) LogPrint (eLogWarning, "NetDbReq: No outbound tunnels"); |
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} |
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} |
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else |
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{ |
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ret = false; |
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LogPrint (eLogWarning, "NetDbReq: Exploratory pool is not ready"); |
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} |
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} |
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} |
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else |
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{ |
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ret = false; |
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if (!nextFloodfill) LogPrint (eLogWarning, "NetDbReq: No more floodfills"); |
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} |
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} |
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else |
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{ |
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if (!dest->IsExploratory ()) |
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LogPrint (eLogWarning, "NetDbReq: ", dest->GetDestination ().ToBase64 (), " not found after 7 attempts"); |
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ret = false; |
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} |
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return ret; |
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} |
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} |
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}
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