I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include "I2PEndian.h"
#include "CryptoConst.h"
#include "Tunnel.h"
#include "NetDb.h"
#include "Timestamp.h"
#include "Garlic.h"
#include "TunnelPool.h"
namespace i2p
{
namespace tunnel
{
TunnelPool::TunnelPool (i2p::garlic::GarlicDestination& localDestination, int numHops, int numTunnels):
m_LocalDestination (localDestination), m_NumHops (numHops), m_NumTunnels (numTunnels),
m_IsActive (true)
{
}
TunnelPool::~TunnelPool ()
{
DetachTunnels ();
}
void TunnelPool::DetachTunnels ()
{
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
for (auto it: m_InboundTunnels)
it->SetTunnelPool (nullptr);
m_InboundTunnels.clear ();
}
{
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
for (auto it: m_OutboundTunnels)
it->SetTunnelPool (nullptr);
m_OutboundTunnels.clear ();
}
m_Tests.clear ();
}
void TunnelPool::TunnelCreated (InboundTunnel * createdTunnel)
{
if (!m_IsActive) return;
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
m_InboundTunnels.insert (createdTunnel);
}
m_LocalDestination.SetLeaseSetUpdated ();
}
void TunnelPool::TunnelExpired (InboundTunnel * expiredTunnel)
{
if (expiredTunnel)
{
expiredTunnel->SetTunnelPool (nullptr);
for (auto it: m_Tests)
if (it.second.second == expiredTunnel) it.second.second = nullptr;
RecreateInboundTunnel (expiredTunnel);
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
m_InboundTunnels.erase (expiredTunnel);
}
}
void TunnelPool::TunnelCreated (OutboundTunnel * createdTunnel)
{
if (!m_IsActive) return;
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
m_OutboundTunnels.insert (createdTunnel);
}
void TunnelPool::TunnelExpired (OutboundTunnel * expiredTunnel)
{
if (expiredTunnel)
{
expiredTunnel->SetTunnelPool (nullptr);
for (auto it: m_Tests)
if (it.second.first == expiredTunnel) it.second.first = nullptr;
RecreateOutboundTunnel (expiredTunnel);
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
m_OutboundTunnels.erase (expiredTunnel);
}
}
std::vector<InboundTunnel *> TunnelPool::GetInboundTunnels (int num) const
{
std::vector<InboundTunnel *> v;
int i = 0;
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
for (auto it : m_InboundTunnels)
{
if (i >= num) break;
if (it->IsEstablished ())
{
v.push_back (it);
i++;
}
}
return v;
}
OutboundTunnel * TunnelPool::GetNextOutboundTunnel (OutboundTunnel * suggested) const
{
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
return GetNextTunnel (m_OutboundTunnels, suggested);
}
InboundTunnel * TunnelPool::GetNextInboundTunnel (InboundTunnel * suggested) const
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
return GetNextTunnel (m_InboundTunnels, suggested);
}
template<class TTunnels>
typename TTunnels::value_type TunnelPool::GetNextTunnel (TTunnels& tunnels,
typename TTunnels::value_type suggested) const
{
if (tunnels.empty ()) return nullptr;
if (suggested && tunnels.count (suggested) > 0 && suggested->IsEstablished ())
return suggested;
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
uint32_t ind = rnd.GenerateWord32 (0, tunnels.size ()/2), i = 0;
typename TTunnels::value_type tunnel = nullptr;
for (auto it: tunnels)
{
if (it->IsEstablished ())
{
tunnel = it;
i++;
}
if (i > ind && tunnel) break;
}
return tunnel;
}
void TunnelPool::CreateTunnels ()
{
int num = 0;
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
for (auto it : m_InboundTunnels)
if (it->IsEstablished ()) num++;
}
for (int i = num; i < m_NumTunnels; i++)
CreateInboundTunnel ();
num = 0;
{
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
for (auto it : m_OutboundTunnels)
if (it->IsEstablished ()) num++;
}
for (int i = num; i < m_NumTunnels; i++)
CreateOutboundTunnel ();
}
void TunnelPool::TestTunnels ()
{
auto& rnd = i2p::context.GetRandomNumberGenerator ();
for (auto it: m_Tests)
{
LogPrint ("Tunnel test ", (int)it.first, " failed");
// if test failed again with another tunnel we consider it failed
if (it.second.first)
{
if (it.second.first->GetState () == eTunnelStateTestFailed)
{
it.second.first->SetState (eTunnelStateFailed);
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
m_OutboundTunnels.erase (it.second.first);
}
else
it.second.first->SetState (eTunnelStateTestFailed);
}
if (it.second.second)
{
if (it.second.second->GetState () == eTunnelStateTestFailed)
{
it.second.second->SetState (eTunnelStateFailed);
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
m_InboundTunnels.erase (it.second.second);
}
m_LocalDestination.SetLeaseSetUpdated ();
}
else
it.second.second->SetState (eTunnelStateTestFailed);
}
}
m_Tests.clear ();
auto it1 = m_OutboundTunnels.begin ();
auto it2 = m_InboundTunnels.begin ();
while (it1 != m_OutboundTunnels.end () && it2 != m_InboundTunnels.end ())
{
bool failed = false;
if ((*it1)->IsFailed ())
{
failed = true;
it1++;
}
if ((*it2)->IsFailed ())
{
failed = true;
it2++;
}
if (!failed)
{
uint32_t msgID = rnd.GenerateWord32 ();
m_Tests[msgID] = std::make_pair (*it1, *it2);
(*it1)->SendTunnelDataMsg ((*it2)->GetNextIdentHash (), (*it2)->GetNextTunnelID (),
CreateDeliveryStatusMsg (msgID));
it1++; it2++;
}
}
}
void TunnelPool::ProcessDeliveryStatus (I2NPMessage * msg)
{
I2NPDeliveryStatusMsg * deliveryStatus = (I2NPDeliveryStatusMsg *)msg->GetPayload ();
auto it = m_Tests.find (be32toh (deliveryStatus->msgID));
if (it != m_Tests.end ())
{
// restore from test failed state if any
if (it->second.first->GetState () == eTunnelStateTestFailed)
it->second.first->SetState (eTunnelStateEstablished);
if (it->second.second->GetState () == eTunnelStateTestFailed)
it->second.second->SetState (eTunnelStateEstablished);
LogPrint ("Tunnel test ", it->first, " successive. ", i2p::util::GetMillisecondsSinceEpoch () - be64toh (deliveryStatus->timestamp), " milliseconds");
m_Tests.erase (it);
DeleteI2NPMessage (msg);
}
else
m_LocalDestination.ProcessDeliveryStatusMessage (msg);
}
const i2p::data::RouterInfo * TunnelPool::SelectNextHop (const i2p::data::RouterInfo * prevHop) const
{
auto hop = m_NumHops >= 3 ? i2p::data::netdb.GetHighBandwidthRandomRouter (prevHop).get () :
i2p::data::netdb.GetRandomRouter (prevHop).get ();
if (!hop)
hop = i2p::data::netdb.GetRandomRouter ().get ();
return hop;
}
void TunnelPool::CreateInboundTunnel ()
{
OutboundTunnel * outboundTunnel = GetNextOutboundTunnel ();
if (!outboundTunnel)
outboundTunnel = tunnels.GetNextOutboundTunnel ();
LogPrint ("Creating destination inbound tunnel...");
const i2p::data::RouterInfo * prevHop = &i2p::context.GetRouterInfo ();
std::vector<const i2p::data::RouterInfo *> hops;
int numHops = m_NumHops;
if (outboundTunnel)
{
// last hop
auto hop = outboundTunnel->GetTunnelConfig ()->GetFirstHop ()->router;
if (hop->GetIdentHash () != i2p::context.GetIdentHash ()) // outbound shouldn't be zero-hop tunnel
{
prevHop = hop;
hops.push_back (prevHop);
numHops--;
}
}
for (int i = 0; i < numHops; i++)
{
auto hop = SelectNextHop (prevHop);
prevHop = hop;
hops.push_back (hop);
}
std::reverse (hops.begin (), hops.end ());
auto * tunnel = tunnels.CreateTunnel<InboundTunnel> (new TunnelConfig (hops), outboundTunnel);
tunnel->SetTunnelPool (this);
}
void TunnelPool::RecreateInboundTunnel (InboundTunnel * tunnel)
{
OutboundTunnel * outboundTunnel = GetNextOutboundTunnel ();
if (!outboundTunnel)
outboundTunnel = tunnels.GetNextOutboundTunnel ();
LogPrint ("Re-creating destination inbound tunnel...");
auto * newTunnel = tunnels.CreateTunnel<InboundTunnel> (tunnel->GetTunnelConfig ()->Clone (), outboundTunnel);
newTunnel->SetTunnelPool (this);
}
void TunnelPool::CreateOutboundTunnel ()
{
InboundTunnel * inboundTunnel = GetNextInboundTunnel ();
if (!inboundTunnel)
inboundTunnel = tunnels.GetNextInboundTunnel ();
if (inboundTunnel)
{
LogPrint ("Creating destination outbound tunnel...");
const i2p::data::RouterInfo * prevHop = &i2p::context.GetRouterInfo ();
std::vector<const i2p::data::RouterInfo *> hops;
for (int i = 0; i < m_NumHops; i++)
{
auto hop = SelectNextHop (prevHop);
prevHop = hop;
hops.push_back (hop);
}
auto * tunnel = tunnels.CreateTunnel<OutboundTunnel> (
new TunnelConfig (hops, inboundTunnel->GetTunnelConfig ()));
tunnel->SetTunnelPool (this);
}
else
LogPrint ("Can't create outbound tunnel. No inbound tunnels found");
}
void TunnelPool::RecreateOutboundTunnel (OutboundTunnel * tunnel)
{
InboundTunnel * inboundTunnel = GetNextInboundTunnel ();
if (!inboundTunnel)
inboundTunnel = tunnels.GetNextInboundTunnel ();
if (inboundTunnel)
{
LogPrint ("Re-creating destination outbound tunnel...");
auto * newTunnel = tunnels.CreateTunnel<OutboundTunnel> (
tunnel->GetTunnelConfig ()->Clone (inboundTunnel->GetTunnelConfig ()));
newTunnel->SetTunnelPool (this);
}
else
LogPrint ("Can't re-create outbound tunnel. No inbound tunnels found");
}
}
}