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438 lines
13 KiB
C++
438 lines
13 KiB
C++
#include <algorithm>
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#include <openssl/rand.h>
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#include "I2PEndian.h"
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#include "Crypto.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 "Log.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::SetExplicitPeers (std::shared_ptr<std::vector<i2p::data::IdentHash> > explicitPeers)
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{
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m_ExplicitPeers = explicitPeers;
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if (m_ExplicitPeers)
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{
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int size = m_ExplicitPeers->size ();
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if (m_NumInboundHops > size)
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{
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m_NumInboundHops = size;
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LogPrint (eLogInfo, "Inbound tunnel length has beed adjusted to ", size, " for explicit peers");
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}
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if (m_NumOutboundHops > size)
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{
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m_NumOutboundHops = size;
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LogPrint (eLogInfo, "Outbound tunnel length has beed adjusted to ", size, " for explicit peers");
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}
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m_NumInboundTunnels = 1;
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m_NumOutboundTunnels = 1;
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}
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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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uint32_t ind = rand () % (tunnels.size ()/2 + 1), 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->GetEndpointIdentHash () == it->GetEndpointIdentHash ())
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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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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;
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RAND_bytes ((uint8_t *)&msgID, 4);
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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 (std::shared_ptr<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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LogPrint (eLogWarning, "Local destination doesn't exist. Dropped");
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}
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void TunnelPool::ProcessDeliveryStatus (std::shared_ptr<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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}
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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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LogPrint (eLogWarning, "Local destination doesn't exist. Dropped");
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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::IdentityEx> >& peers, bool isInbound)
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{
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if (m_ExplicitPeers) return SelectExplicitPeers (peers, isInbound);
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auto prevHop = i2p::context.GetSharedRouterInfo ();
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int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
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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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peers.push_back (r->GetRouterIdentity ());
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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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peers.push_back (hop->GetRouterIdentity ());
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}
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return true;
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}
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bool TunnelPool::SelectExplicitPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound)
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{
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int size = m_ExplicitPeers->size ();
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std::vector<int> peerIndicies;
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for (int i = 0; i < size; i++) peerIndicies.push_back(i);
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std::random_shuffle (peerIndicies.begin(), peerIndicies.end());
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int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
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for (int i = 0; i < numHops; i++)
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{
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auto& ident = (*m_ExplicitPeers)[peerIndicies[i]];
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auto r = i2p::data::netdb.FindRouter (ident);
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if (r)
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peers.push_back (r->GetRouterIdentity ());
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else
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{
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LogPrint (eLogInfo, "Can't find router for ", ident.ToBase64 ());
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i2p::data::netdb.RequestDestination (ident);
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return false;
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}
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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::IdentityEx> > peers;
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if (SelectPeers (peers, true))
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{
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std::reverse (peers.begin (), peers.end ());
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auto tunnel = tunnels.CreateTunnel<InboundTunnel> (std::make_shared<TunnelConfig> (peers), 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> (std::make_shared<TunnelConfig>(tunnel->GetPeers ()), 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::IdentityEx> > peers;
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if (SelectPeers (peers, false))
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{
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auto tunnel = tunnels.CreateTunnel<OutboundTunnel> (
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std::make_shared<TunnelConfig> (peers, inboundTunnel->GetNextTunnelID (), inboundTunnel->GetNextIdentHash ()));
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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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std::make_shared<TunnelConfig> (tunnel->GetPeers (),
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inboundTunnel->GetNextTunnelID (), inboundTunnel->GetNextIdentHash ()));
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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> (std::make_shared<TunnelConfig>(outboundTunnel->GetInvertedPeers ()), 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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