mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-05 15:11:13 +00:00
330 lines
9.3 KiB
C++
330 lines
9.3 KiB
C++
#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 "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 numHops, int numTunnels):
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m_LocalDestination (localDestination), m_NumHops (numHops), m_NumTunnels (numTunnels),
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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 (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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m_LocalDestination.SetLeaseSetUpdated ();
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}
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void TunnelPool::TunnelExpired (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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RecreateInboundTunnel (expiredTunnel);
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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 (OutboundTunnel * createdTunnel)
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{
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if (!m_IsActive) return;
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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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void TunnelPool::TunnelExpired (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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RecreateOutboundTunnel (expiredTunnel);
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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<InboundTunnel *> TunnelPool::GetInboundTunnels (int num) const
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{
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std::vector<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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OutboundTunnel * TunnelPool::GetNextOutboundTunnel (OutboundTunnel * suggested) 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, suggested);
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}
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InboundTunnel * TunnelPool::GetNextInboundTunnel (InboundTunnel * suggested) 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, suggested);
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}
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template<class TTunnels>
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typename TTunnels::value_type TunnelPool::GetNextTunnel (TTunnels& tunnels,
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typename TTunnels::value_type suggested) const
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{
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if (tunnels.empty ()) return nullptr;
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if (suggested && tunnels.count (suggested) > 0 && suggested->IsEstablished ())
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return suggested;
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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 ())
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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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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_NumTunnels; 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_NumTunnels; 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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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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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::ProcessDeliveryStatus (I2NPMessage * msg)
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{
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I2NPDeliveryStatusMsg * deliveryStatus = (I2NPDeliveryStatusMsg *)msg->GetPayload ();
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auto it = m_Tests.find (be32toh (deliveryStatus->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 () - be64toh (deliveryStatus->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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m_LocalDestination.ProcessDeliveryStatusMessage (msg);
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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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auto hop = m_NumHops >= 3 ? i2p::data::netdb.GetHighBandwidthRandomRouter (prevHop) :
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i2p::data::netdb.GetRandomRouter (prevHop);
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if (!hop)
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hop = i2p::data::netdb.GetRandomRouter ();
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return hop;
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}
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void TunnelPool::CreateInboundTunnel ()
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{
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OutboundTunnel * 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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auto prevHop = i2p::context.GetSharedRouterInfo ();
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std::vector<std::shared_ptr<const i2p::data::RouterInfo> > hops;
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int numHops = m_NumHops;
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if (outboundTunnel)
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{
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// last hop
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auto hop = outboundTunnel->GetTunnelConfig ()->GetFirstHop ()->router;
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if (hop->GetIdentHash () != i2p::context.GetIdentHash ()) // outbound shouldn't be zero-hop tunnel
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{
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prevHop = hop;
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hops.push_back (prevHop);
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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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prevHop = hop;
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hops.push_back (hop);
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}
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std::reverse (hops.begin (), hops.end ());
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auto * tunnel = tunnels.CreateTunnel<InboundTunnel> (new TunnelConfig (hops), outboundTunnel);
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tunnel->SetTunnelPool (this);
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}
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void TunnelPool::RecreateInboundTunnel (InboundTunnel * tunnel)
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{
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OutboundTunnel * 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 (this);
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}
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void TunnelPool::CreateOutboundTunnel ()
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{
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InboundTunnel * 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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auto prevHop = i2p::context.GetSharedRouterInfo ();
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std::vector<std::shared_ptr<const i2p::data::RouterInfo> > hops;
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for (int i = 0; i < m_NumHops; i++)
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{
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auto hop = SelectNextHop (prevHop);
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prevHop = hop;
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hops.push_back (hop);
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}
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auto * tunnel = tunnels.CreateTunnel<OutboundTunnel> (
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new TunnelConfig (hops, inboundTunnel->GetTunnelConfig ()));
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tunnel->SetTunnelPool (this);
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}
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else
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LogPrint ("Can't create outbound tunnel. No inbound tunnels found");
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}
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void TunnelPool::RecreateOutboundTunnel (OutboundTunnel * tunnel)
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{
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InboundTunnel * 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 (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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}
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}
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