I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <algorithm>
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#include "I2PEndian.h"
#include "Crypto.h"
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#include "Tunnel.h"
#include "NetDb.h"
#include "Timestamp.h"
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#include "Garlic.h"
#include "Transports.h"
#include "Log.h"
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#include "TunnelPool.h"
namespace i2p
{
namespace tunnel
{
TunnelPool::TunnelPool (int numInboundHops, int numOutboundHops, int numInboundTunnels, int numOutboundTunnels):
m_NumInboundHops (numInboundHops), m_NumOutboundHops (numOutboundHops),
m_NumInboundTunnels (numInboundTunnels), m_NumOutboundTunnels (numOutboundTunnels), m_IsActive (true)
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{
}
TunnelPool::~TunnelPool ()
{
DetachTunnels ();
}
void TunnelPool::SetExplicitPeers (std::shared_ptr<std::vector<i2p::data::IdentHash> > explicitPeers)
{
m_ExplicitPeers = explicitPeers;
if (m_ExplicitPeers)
{
int size = m_ExplicitPeers->size ();
if (m_NumInboundHops > size)
{
m_NumInboundHops = size;
LogPrint (eLogInfo, "Tunnels: Inbound tunnel length has beed adjusted to ", size, " for explicit peers");
}
if (m_NumOutboundHops > size)
{
m_NumOutboundHops = size;
LogPrint (eLogInfo, "Tunnels: Outbound tunnel length has beed adjusted to ", size, " for explicit peers");
}
m_NumInboundTunnels = 1;
m_NumOutboundTunnels = 1;
}
}
void TunnelPool::DetachTunnels ()
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{
{
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 (std::shared_ptr<InboundTunnel> createdTunnel)
{
if (!m_IsActive) return;
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
m_InboundTunnels.insert (createdTunnel);
}
if (m_LocalDestination)
m_LocalDestination->SetLeaseSetUpdated ();
}
void TunnelPool::TunnelExpired (std::shared_ptr<InboundTunnel> expiredTunnel)
{
if (expiredTunnel)
{
expiredTunnel->SetTunnelPool (nullptr);
for (auto it: m_Tests)
if (it.second.second == expiredTunnel) it.second.second = nullptr;
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
m_InboundTunnels.erase (expiredTunnel);
}
}
void TunnelPool::TunnelCreated (std::shared_ptr<OutboundTunnel> createdTunnel)
{
if (!m_IsActive) return;
{
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
m_OutboundTunnels.insert (createdTunnel);
}
//CreatePairedInboundTunnel (createdTunnel);
}
void TunnelPool::TunnelExpired (std::shared_ptr<OutboundTunnel> expiredTunnel)
{
if (expiredTunnel)
{
expiredTunnel->SetTunnelPool (nullptr);
for (auto it: m_Tests)
if (it.second.first == expiredTunnel) it.second.first = nullptr;
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
m_OutboundTunnels.erase (expiredTunnel);
}
}
std::vector<std::shared_ptr<InboundTunnel> > TunnelPool::GetInboundTunnels (int num) const
{
std::vector<std::shared_ptr<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;
}
std::shared_ptr<OutboundTunnel> TunnelPool::GetNextOutboundTunnel (std::shared_ptr<OutboundTunnel> excluded) const
{
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
return GetNextTunnel (m_OutboundTunnels, excluded);
}
std::shared_ptr<InboundTunnel> TunnelPool::GetNextInboundTunnel (std::shared_ptr<InboundTunnel> excluded) const
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
return GetNextTunnel (m_InboundTunnels, excluded);
}
template<class TTunnels>
typename TTunnels::value_type TunnelPool::GetNextTunnel (TTunnels& tunnels, typename TTunnels::value_type excluded) const
{
if (tunnels.empty ()) return nullptr;
uint32_t ind = rand () % (tunnels.size ()/2 + 1), i = 0;
typename TTunnels::value_type tunnel = nullptr;
for (auto it: tunnels)
{
if (it->IsEstablished () && it != excluded)
{
tunnel = it;
i++;
}
if (i > ind && tunnel) break;
}
if (!tunnel && excluded && excluded->IsEstablished ()) tunnel = excluded;
return tunnel;
}
std::shared_ptr<OutboundTunnel> TunnelPool::GetNewOutboundTunnel (std::shared_ptr<OutboundTunnel> old) const
{
if (old && old->IsEstablished ()) return old;
std::shared_ptr<OutboundTunnel> tunnel;
if (old)
{
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
for (auto it: m_OutboundTunnels)
if (it->IsEstablished () && old->GetEndpointIdentHash () == it->GetEndpointIdentHash ())
{
tunnel = it;
break;
}
}
if (!tunnel)
tunnel = GetNextOutboundTunnel ();
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_NumInboundTunnels; 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_NumOutboundTunnels; i++)
CreateOutboundTunnel ();
}
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void TunnelPool::TestTunnels ()
{
decltype(m_Tests) tests;
{
std::unique_lock<std::mutex> l(m_TestsMutex);
tests = m_Tests;
m_Tests.clear ();
}
for (auto it: tests)
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{
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LogPrint (eLogWarning, "Tunnels: test of tunnel ", it.first, " failed");
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// if test failed again with another tunnel we consider it failed
if (it.second.first)
{
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if (it.second.first->GetState () == eTunnelStateTestFailed)
{
it.second.first->SetState (eTunnelStateFailed);
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
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m_OutboundTunnels.erase (it.second.first);
}
else
it.second.first->SetState (eTunnelStateTestFailed);
}
if (it.second.second)
{
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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);
}
if (m_LocalDestination)
m_LocalDestination->SetLeaseSetUpdated ();
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}
else
it.second.second->SetState (eTunnelStateTestFailed);
}
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}
// new tests
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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)
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{
uint32_t msgID;
RAND_bytes ((uint8_t *)&msgID, 4);
{
std::unique_lock<std::mutex> l(m_TestsMutex);
m_Tests[msgID] = std::make_pair (*it1, *it2);
}
(*it1)->SendTunnelDataMsg ((*it2)->GetNextIdentHash (), (*it2)->GetNextTunnelID (),
CreateDeliveryStatusMsg (msgID));
it1++; it2++;
}
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}
}
void TunnelPool::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
{
if (m_LocalDestination)
m_LocalDestination->ProcessGarlicMessage (msg);
else
LogPrint (eLogWarning, "Tunnels: local destination doesn't exist, dropped");
}
void TunnelPool::ProcessDeliveryStatus (std::shared_ptr<I2NPMessage> msg)
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{
const uint8_t * buf = msg->GetPayload ();
uint32_t msgID = bufbe32toh (buf);
buf += 4;
uint64_t timestamp = bufbe64toh (buf);
decltype(m_Tests)::mapped_type test;
bool found = false;
{
std::unique_lock<std::mutex> l(m_TestsMutex);
auto it = m_Tests.find (msgID);
if (it != m_Tests.end ())
{
found = true;
test = it->second;
m_Tests.erase (it);
}
}
if (found)
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{
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// restore from test failed state if any
if (test.first->GetState () == eTunnelStateTestFailed)
test.first->SetState (eTunnelStateEstablished);
if (test.second->GetState () == eTunnelStateTestFailed)
test.second->SetState (eTunnelStateEstablished);
LogPrint (eLogDebug, "Tunnels: test of ", msgID, " successful. ", i2p::util::GetMillisecondsSinceEpoch () - timestamp, " milliseconds");
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}
else
{
if (m_LocalDestination)
m_LocalDestination->ProcessDeliveryStatusMessage (msg);
else
LogPrint (eLogWarning, "Tunnels: Local destination doesn't exist, dropped");
}
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}
std::shared_ptr<const i2p::data::RouterInfo> TunnelPool::SelectNextHop (std::shared_ptr<const i2p::data::RouterInfo> prevHop) const
{
bool isExploratory = (i2p::tunnel::tunnels.GetExploratoryPool () == shared_from_this ());
auto hop = isExploratory ? i2p::data::netdb.GetRandomRouter (prevHop):
i2p::data::netdb.GetHighBandwidthRandomRouter (prevHop);
if (!hop || hop->GetProfile ()->IsBad ())
hop = i2p::data::netdb.GetRandomRouter ();
return hop;
}
bool TunnelPool::SelectPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound)
{
if (m_ExplicitPeers) return SelectExplicitPeers (peers, isInbound);
int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
if (numHops <= 0) return true; // peers is empty
auto prevHop = i2p::context.GetSharedRouterInfo ();
if (i2p::transport::transports.GetNumPeers () > 25)
{
auto r = i2p::transport::transports.GetRandomPeer ();
if (r && !r->GetProfile ()->IsBad ())
{
prevHop = r;
peers.push_back (r->GetRouterIdentity ());
numHops--;
}
}
for (int i = 0; i < numHops; i++)
{
auto hop = SelectNextHop (prevHop);
if (!hop)
{
LogPrint (eLogError, "Tunnels: Can't select next hop for ", prevHop->GetIdentHashBase64 ());
return false;
}
prevHop = hop;
peers.push_back (hop->GetRouterIdentity ());
}
return true;
}
bool TunnelPool::SelectExplicitPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound)
{
int size = m_ExplicitPeers->size ();
std::vector<int> peerIndicies;
for (int i = 0; i < size; i++) peerIndicies.push_back(i);
std::random_shuffle (peerIndicies.begin(), peerIndicies.end());
int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
for (int i = 0; i < numHops; i++)
{
auto& ident = (*m_ExplicitPeers)[peerIndicies[i]];
auto r = i2p::data::netdb.FindRouter (ident);
if (r)
peers.push_back (r->GetRouterIdentity ());
else
{
LogPrint (eLogInfo, "Tunnels: Can't find router for ", ident.ToBase64 ());
i2p::data::netdb.RequestDestination (ident);
return false;
}
}
return true;
}
void TunnelPool::CreateInboundTunnel ()
{
auto outboundTunnel = GetNextOutboundTunnel ();
if (!outboundTunnel)
outboundTunnel = tunnels.GetNextOutboundTunnel ();
LogPrint (eLogDebug, "Tunnels: Creating destination inbound tunnel...");
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > peers;
if (SelectPeers (peers, true))
{
std::shared_ptr<TunnelConfig> config;
if (m_NumInboundHops > 0)
{
std::reverse (peers.begin (), peers.end ());
config = std::make_shared<TunnelConfig> (peers);
}
else
config = std::make_shared<ZeroHopsTunnelConfig> ();
auto tunnel = tunnels.CreateInboundTunnel (config, outboundTunnel);
tunnel->SetTunnelPool (shared_from_this ());
if (tunnel->IsEstablished ()) // zero hops
TunnelCreated (tunnel);
}
else
LogPrint (eLogError, "Tunnels: Can't create inbound tunnel, no peers available");
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}
void TunnelPool::RecreateInboundTunnel (std::shared_ptr<InboundTunnel> tunnel)
{
auto outboundTunnel = GetNextOutboundTunnel ();
if (!outboundTunnel)
outboundTunnel = tunnels.GetNextOutboundTunnel ();
LogPrint (eLogDebug, "Tunnels: Re-creating destination inbound tunnel...");
std::shared_ptr<TunnelConfig> config = m_NumInboundHops > 0 ?
std::make_shared<TunnelConfig>(tunnel->GetPeers ()) : std::make_shared<ZeroHopsTunnelConfig> ();
auto newTunnel = tunnels.CreateInboundTunnel (config, outboundTunnel);
newTunnel->SetTunnelPool (shared_from_this());
if (newTunnel->IsEstablished ()) // zero hops
TunnelCreated (newTunnel);
}
void TunnelPool::CreateOutboundTunnel ()
{
auto inboundTunnel = GetNextInboundTunnel ();
if (!inboundTunnel)
inboundTunnel = tunnels.GetNextInboundTunnel ();
if (inboundTunnel)
{
LogPrint (eLogDebug, "Tunnels: Creating destination outbound tunnel...");
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > peers;
if (SelectPeers (peers, false))
{
std::shared_ptr<TunnelConfig> config = m_NumOutboundHops > 0 ?
std::make_shared<TunnelConfig>(peers, inboundTunnel->GetNextTunnelID (), inboundTunnel->GetNextIdentHash ()) :
std::make_shared<ZeroHopsTunnelConfig> ();
auto tunnel = tunnels.CreateOutboundTunnel (config);
tunnel->SetTunnelPool (shared_from_this ());
if (tunnel->IsEstablished ()) // zero hops
TunnelCreated (tunnel);
}
else
LogPrint (eLogError, "Tunnels: Can't create outbound tunnel, no peers available");
}
else
LogPrint (eLogError, "Tunnels: Can't create outbound tunnel, no inbound tunnels found");
}
void TunnelPool::RecreateOutboundTunnel (std::shared_ptr<OutboundTunnel> tunnel)
{
auto inboundTunnel = GetNextInboundTunnel ();
if (!inboundTunnel)
inboundTunnel = tunnels.GetNextInboundTunnel ();
if (inboundTunnel)
{
LogPrint (eLogDebug, "Tunnels: Re-creating destination outbound tunnel...");
std::shared_ptr<TunnelConfig> config = m_NumOutboundHops > 0 ?
std::make_shared<TunnelConfig>(tunnel->GetPeers (), inboundTunnel->GetNextTunnelID (), inboundTunnel->GetNextIdentHash ()) :
std::make_shared<ZeroHopsTunnelConfig> ();
auto newTunnel = tunnels.CreateOutboundTunnel (config);
newTunnel->SetTunnelPool (shared_from_this ());
if (newTunnel->IsEstablished ()) // zero hops
TunnelCreated (newTunnel);
}
else
LogPrint (eLogDebug, "Tunnels: Can't re-create outbound tunnel, no inbound tunnels found");
}
void TunnelPool::CreatePairedInboundTunnel (std::shared_ptr<OutboundTunnel> outboundTunnel)
{
LogPrint (eLogDebug, "Tunnels: Creating paired inbound tunnel...");
auto tunnel = tunnels.CreateInboundTunnel (std::make_shared<TunnelConfig>(outboundTunnel->GetInvertedPeers ()), outboundTunnel);
tunnel->SetTunnelPool (shared_from_this ());
}
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}
}