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I2P: End-to-End encrypted and anonymous Internet
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395 lines
11 KiB
395 lines
11 KiB
#include "I2PEndian.h" |
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#include "CryptoConst.h" |
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#include "Tunnel.h" |
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#include "NetDb.h" |
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#include "Timestamp.h" |
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#include "Garlic.h" |
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#include "Transports.h" |
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#include "TunnelPool.h" |
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namespace i2p |
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{ |
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namespace tunnel |
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{ |
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TunnelPool::TunnelPool (i2p::garlic::GarlicDestination * localDestination, int numInboundHops, int numOutboundHops, int numInboundTunnels, int numOutboundTunnels): |
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m_LocalDestination (localDestination), m_NumInboundHops (numInboundHops), m_NumOutboundHops (numOutboundHops), |
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m_NumInboundTunnels (numInboundTunnels), m_NumOutboundTunnels (numOutboundTunnels), m_IsActive (true) |
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{ |
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} |
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TunnelPool::~TunnelPool () |
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{ |
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DetachTunnels (); |
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} |
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void TunnelPool::DetachTunnels () |
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{ |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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for (auto it: m_InboundTunnels) |
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it->SetTunnelPool (nullptr); |
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m_InboundTunnels.clear (); |
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} |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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for (auto it: m_OutboundTunnels) |
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it->SetTunnelPool (nullptr); |
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m_OutboundTunnels.clear (); |
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} |
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m_Tests.clear (); |
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} |
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void TunnelPool::TunnelCreated (std::shared_ptr<InboundTunnel> createdTunnel) |
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{ |
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if (!m_IsActive) return; |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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m_InboundTunnels.insert (createdTunnel); |
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} |
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if (m_LocalDestination) |
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m_LocalDestination->SetLeaseSetUpdated (); |
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} |
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void TunnelPool::TunnelExpired (std::shared_ptr<InboundTunnel> expiredTunnel) |
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{ |
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if (expiredTunnel) |
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{ |
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expiredTunnel->SetTunnelPool (nullptr); |
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for (auto it: m_Tests) |
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if (it.second.second == expiredTunnel) it.second.second = nullptr; |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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m_InboundTunnels.erase (expiredTunnel); |
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} |
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} |
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void TunnelPool::TunnelCreated (std::shared_ptr<OutboundTunnel> createdTunnel) |
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{ |
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if (!m_IsActive) return; |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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m_OutboundTunnels.insert (createdTunnel); |
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} |
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//CreatePairedInboundTunnel (createdTunnel); |
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} |
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void TunnelPool::TunnelExpired (std::shared_ptr<OutboundTunnel> expiredTunnel) |
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{ |
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if (expiredTunnel) |
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{ |
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expiredTunnel->SetTunnelPool (nullptr); |
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for (auto it: m_Tests) |
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if (it.second.first == expiredTunnel) it.second.first = nullptr; |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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m_OutboundTunnels.erase (expiredTunnel); |
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} |
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} |
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std::vector<std::shared_ptr<InboundTunnel> > TunnelPool::GetInboundTunnels (int num) const |
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{ |
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std::vector<std::shared_ptr<InboundTunnel> > v; |
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int i = 0; |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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for (auto it : m_InboundTunnels) |
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{ |
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if (i >= num) break; |
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if (it->IsEstablished ()) |
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{ |
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v.push_back (it); |
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i++; |
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} |
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} |
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return v; |
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} |
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std::shared_ptr<OutboundTunnel> TunnelPool::GetNextOutboundTunnel (std::shared_ptr<OutboundTunnel> excluded) const |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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return GetNextTunnel (m_OutboundTunnels, excluded); |
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} |
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std::shared_ptr<InboundTunnel> TunnelPool::GetNextInboundTunnel (std::shared_ptr<InboundTunnel> excluded) const |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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return GetNextTunnel (m_InboundTunnels, excluded); |
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} |
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template<class TTunnels> |
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typename TTunnels::value_type TunnelPool::GetNextTunnel (TTunnels& tunnels, typename TTunnels::value_type excluded) const |
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{ |
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if (tunnels.empty ()) return nullptr; |
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CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator (); |
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uint32_t ind = rnd.GenerateWord32 (0, tunnels.size ()/2), i = 0; |
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typename TTunnels::value_type tunnel = nullptr; |
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for (auto it: tunnels) |
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{ |
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if (it->IsEstablished () && it != excluded) |
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{ |
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tunnel = it; |
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i++; |
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} |
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if (i > ind && tunnel) break; |
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} |
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if (!tunnel && excluded && excluded->IsEstablished ()) tunnel = excluded; |
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return tunnel; |
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} |
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std::shared_ptr<OutboundTunnel> TunnelPool::GetNewOutboundTunnel (std::shared_ptr<OutboundTunnel> old) const |
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{ |
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if (old && old->IsEstablished ()) return old; |
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std::shared_ptr<OutboundTunnel> tunnel; |
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if (old) |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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for (auto it: m_OutboundTunnels) |
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if (it->IsEstablished () && old->GetEndpointRouter ()->GetIdentHash () == it->GetEndpointRouter ()->GetIdentHash ()) |
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{ |
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tunnel = it; |
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break; |
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} |
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} |
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if (!tunnel) |
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tunnel = GetNextOutboundTunnel (); |
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return tunnel; |
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} |
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void TunnelPool::CreateTunnels () |
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{ |
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int num = 0; |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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for (auto it : m_InboundTunnels) |
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if (it->IsEstablished ()) num++; |
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} |
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for (int i = num; i < m_NumInboundTunnels; i++) |
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CreateInboundTunnel (); |
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num = 0; |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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for (auto it : m_OutboundTunnels) |
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if (it->IsEstablished ()) num++; |
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} |
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for (int i = num; i < m_NumOutboundTunnels; i++) |
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CreateOutboundTunnel (); |
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} |
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void TunnelPool::TestTunnels () |
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{ |
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auto& rnd = i2p::context.GetRandomNumberGenerator (); |
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for (auto it: m_Tests) |
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{ |
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LogPrint ("Tunnel test ", (int)it.first, " failed"); |
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// if test failed again with another tunnel we consider it failed |
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if (it.second.first) |
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{ |
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if (it.second.first->GetState () == eTunnelStateTestFailed) |
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{ |
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it.second.first->SetState (eTunnelStateFailed); |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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m_OutboundTunnels.erase (it.second.first); |
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} |
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else |
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it.second.first->SetState (eTunnelStateTestFailed); |
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} |
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if (it.second.second) |
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{ |
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if (it.second.second->GetState () == eTunnelStateTestFailed) |
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{ |
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it.second.second->SetState (eTunnelStateFailed); |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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m_InboundTunnels.erase (it.second.second); |
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} |
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if (m_LocalDestination) |
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m_LocalDestination->SetLeaseSetUpdated (); |
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} |
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else |
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it.second.second->SetState (eTunnelStateTestFailed); |
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} |
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} |
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m_Tests.clear (); |
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// new tests |
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auto it1 = m_OutboundTunnels.begin (); |
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auto it2 = m_InboundTunnels.begin (); |
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while (it1 != m_OutboundTunnels.end () && it2 != m_InboundTunnels.end ()) |
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{ |
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bool failed = false; |
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if ((*it1)->IsFailed ()) |
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{ |
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failed = true; |
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it1++; |
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} |
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if ((*it2)->IsFailed ()) |
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{ |
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failed = true; |
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it2++; |
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} |
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if (!failed) |
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{ |
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uint32_t msgID = rnd.GenerateWord32 (); |
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m_Tests[msgID] = std::make_pair (*it1, *it2); |
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(*it1)->SendTunnelDataMsg ((*it2)->GetNextIdentHash (), (*it2)->GetNextTunnelID (), |
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CreateDeliveryStatusMsg (msgID)); |
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it1++; it2++; |
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} |
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} |
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} |
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void TunnelPool::ProcessGarlicMessage (I2NPMessage * msg) |
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{ |
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if (m_LocalDestination) |
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m_LocalDestination->ProcessGarlicMessage (msg); |
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else |
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{ |
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LogPrint (eLogWarning, "Local destination doesn't exist. Dropped"); |
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DeleteI2NPMessage (msg); |
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} |
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} |
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void TunnelPool::ProcessDeliveryStatus (I2NPMessage * msg) |
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{ |
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const uint8_t * buf = msg->GetPayload (); |
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uint32_t msgID = bufbe32toh (buf); |
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buf += 4; |
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uint64_t timestamp = bufbe64toh (buf); |
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auto it = m_Tests.find (msgID); |
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if (it != m_Tests.end ()) |
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{ |
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// restore from test failed state if any |
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if (it->second.first->GetState () == eTunnelStateTestFailed) |
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it->second.first->SetState (eTunnelStateEstablished); |
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if (it->second.second->GetState () == eTunnelStateTestFailed) |
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it->second.second->SetState (eTunnelStateEstablished); |
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LogPrint ("Tunnel test ", it->first, " successive. ", i2p::util::GetMillisecondsSinceEpoch () - timestamp, " milliseconds"); |
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m_Tests.erase (it); |
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DeleteI2NPMessage (msg); |
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} |
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else |
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{ |
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if (m_LocalDestination) |
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m_LocalDestination->ProcessDeliveryStatusMessage (msg); |
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else |
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{ |
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LogPrint (eLogWarning, "Local destination doesn't exist. Dropped"); |
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DeleteI2NPMessage (msg); |
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} |
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} |
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} |
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std::shared_ptr<const i2p::data::RouterInfo> TunnelPool::SelectNextHop (std::shared_ptr<const i2p::data::RouterInfo> prevHop) const |
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{ |
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bool isExploratory = (m_LocalDestination == &i2p::context); // TODO: implement it better |
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auto hop = isExploratory ? i2p::data::netdb.GetRandomRouter (prevHop): |
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i2p::data::netdb.GetHighBandwidthRandomRouter (prevHop); |
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if (!hop || hop->GetProfile ()->IsBad ()) |
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hop = i2p::data::netdb.GetRandomRouter (); |
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return hop; |
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} |
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bool TunnelPool::SelectPeers (std::vector<std::shared_ptr<const i2p::data::RouterInfo> >& hops) |
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{ |
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auto prevHop = i2p::context.GetSharedRouterInfo (); |
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int numHops = m_NumInboundHops; |
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if (i2p::transport::transports.GetNumPeers () > 25) |
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{ |
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auto r = i2p::transport::transports.GetRandomPeer (); |
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if (r && !r->GetProfile ()->IsBad ()) |
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{ |
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prevHop = r; |
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hops.push_back (r); |
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numHops--; |
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} |
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} |
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for (int i = 0; i < numHops; i++) |
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{ |
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auto hop = SelectNextHop (prevHop); |
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if (!hop) |
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{ |
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LogPrint (eLogError, "Can't select next hop"); |
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return false; |
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} |
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prevHop = hop; |
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hops.push_back (hop); |
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} |
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return true; |
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} |
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void TunnelPool::CreateInboundTunnel () |
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{ |
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auto outboundTunnel = GetNextOutboundTunnel (); |
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if (!outboundTunnel) |
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outboundTunnel = tunnels.GetNextOutboundTunnel (); |
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LogPrint ("Creating destination inbound tunnel..."); |
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std::vector<std::shared_ptr<const i2p::data::RouterInfo> > hops; |
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if (SelectPeers (hops)) |
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{ |
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std::reverse (hops.begin (), hops.end ()); |
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auto tunnel = tunnels.CreateTunnel<InboundTunnel> (std::make_shared<TunnelConfig> (hops), outboundTunnel); |
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tunnel->SetTunnelPool (shared_from_this ()); |
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} |
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else |
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LogPrint (eLogError, "Can't create inbound tunnel. No peers available"); |
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} |
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void TunnelPool::RecreateInboundTunnel (std::shared_ptr<InboundTunnel> tunnel) |
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{ |
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auto outboundTunnel = GetNextOutboundTunnel (); |
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if (!outboundTunnel) |
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outboundTunnel = tunnels.GetNextOutboundTunnel (); |
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LogPrint ("Re-creating destination inbound tunnel..."); |
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auto newTunnel = tunnels.CreateTunnel<InboundTunnel> (tunnel->GetTunnelConfig ()->Clone (), outboundTunnel); |
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newTunnel->SetTunnelPool (shared_from_this()); |
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} |
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void TunnelPool::CreateOutboundTunnel () |
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{ |
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auto inboundTunnel = GetNextInboundTunnel (); |
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if (!inboundTunnel) |
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inboundTunnel = tunnels.GetNextInboundTunnel (); |
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if (inboundTunnel) |
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{ |
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LogPrint ("Creating destination outbound tunnel..."); |
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std::vector<std::shared_ptr<const i2p::data::RouterInfo> > hops; |
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if (SelectPeers (hops)) |
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{ |
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auto tunnel = tunnels.CreateTunnel<OutboundTunnel> ( |
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std::make_shared<TunnelConfig> (hops, inboundTunnel->GetTunnelConfig ())); |
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tunnel->SetTunnelPool (shared_from_this ()); |
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} |
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else |
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LogPrint (eLogError, "Can't create outbound tunnel. No peers available"); |
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} |
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else |
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LogPrint (eLogError, "Can't create outbound tunnel. No inbound tunnels found"); |
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} |
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void TunnelPool::RecreateOutboundTunnel (std::shared_ptr<OutboundTunnel> tunnel) |
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{ |
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auto inboundTunnel = GetNextInboundTunnel (); |
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if (!inboundTunnel) |
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inboundTunnel = tunnels.GetNextInboundTunnel (); |
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if (inboundTunnel) |
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{ |
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LogPrint ("Re-creating destination outbound tunnel..."); |
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auto newTunnel = tunnels.CreateTunnel<OutboundTunnel> ( |
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tunnel->GetTunnelConfig ()->Clone (inboundTunnel->GetTunnelConfig ())); |
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newTunnel->SetTunnelPool (shared_from_this ()); |
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} |
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else |
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LogPrint ("Can't re-create outbound tunnel. No inbound tunnels found"); |
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} |
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void TunnelPool::CreatePairedInboundTunnel (std::shared_ptr<OutboundTunnel> outboundTunnel) |
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{ |
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LogPrint (eLogInfo, "Creating paired inbound tunnel..."); |
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auto tunnel = tunnels.CreateTunnel<InboundTunnel> (outboundTunnel->GetTunnelConfig ()->Invert (), outboundTunnel); |
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tunnel->SetTunnelPool (shared_from_this ()); |
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} |
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} |
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}
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