I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2021, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include <algorithm>
#include <random>
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#include "I2PEndian.h"
#include "Crypto.h"
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#include "Tunnel.h"
#include "NetDb.hpp"
#include "Timestamp.h"
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#include "Garlic.h"
#include "Transports.h"
#include "Log.h"
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#include "Tunnel.h"
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#include "TunnelPool.h"
#include "Destination.h"
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namespace i2p
{
namespace tunnel
{
void Path::Add (std::shared_ptr<const i2p::data::RouterInfo> r)
{
if (r)
{
peers.push_back (r->GetRouterIdentity ());
if (r->GetVersion () < i2p::data::NETDB_MIN_SHORT_TUNNEL_BUILD_VERSION ||
r->GetRouterIdentity ()->GetCryptoKeyType () != i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
isShort = false;
}
}
void Path::Reverse ()
{
std::reverse (peers.begin (), peers.end ());
}
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), m_CustomPeerSelector(nullptr)
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{
if (m_NumInboundTunnels > TUNNEL_POOL_MAX_INBOUND_TUNNELS_QUANTITY)
m_NumInboundTunnels = TUNNEL_POOL_MAX_INBOUND_TUNNELS_QUANTITY;
if (m_NumOutboundTunnels > TUNNEL_POOL_MAX_OUTBOUND_TUNNELS_QUANTITY)
m_NumOutboundTunnels = TUNNEL_POOL_MAX_OUTBOUND_TUNNELS_QUANTITY;
m_NextManageTime = i2p::util::GetSecondsSinceEpoch () + rand () % TUNNEL_POOL_MANAGE_INTERVAL;
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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 ();
}
bool TunnelPool::Reconfigure(int inHops, int outHops, int inQuant, int outQuant)
{
if( inHops >= 0 && outHops >= 0 && inQuant > 0 && outQuant > 0)
{
m_NumInboundHops = inHops;
m_NumOutboundHops = outHops;
m_NumInboundTunnels = inQuant;
m_NumOutboundTunnels = outQuant;
return true;
}
return false;
}
void TunnelPool::TunnelCreated (std::shared_ptr<InboundTunnel> createdTunnel)
{
if (!m_IsActive) return;
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
if (createdTunnel->IsRecreated ())
{
// find and mark old tunnel as expired
createdTunnel->SetRecreated (false);
for (auto& it: m_InboundTunnels)
if (it->IsRecreated () && it->GetNextIdentHash () == createdTunnel->GetNextIdentHash ())
{
it->SetState (eTunnelStateExpiring);
break;
}
}
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);
}
}
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::shared_ptr<InboundTunnel> slowTunnel;
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
for (const auto& it : m_InboundTunnels)
{
if (i >= num) break;
if (it->IsEstablished ())
{
if (it->IsSlow () && !slowTunnel)
slowTunnel = it;
else
{
v.push_back (it);
i++;
}
}
}
if (slowTunnel && (int)v.size () < (num/2+1))
v.push_back (slowTunnel);
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;
bool skipped = false;
typename TTunnels::value_type tunnel = nullptr;
for (const auto& it: tunnels)
{
if (it->IsEstablished () && it != excluded)
{
if (it->IsSlow () || (HasLatencyRequirement() && it->LatencyIsKnown() &&
!it->LatencyFitsRange(m_MinLatency, m_MaxLatency)))
{
i++; skipped = true;
continue;
}
tunnel = it;
i++;
}
if (i > ind && tunnel) break;
}
if (!tunnel && skipped)
{
ind = rand () % (tunnels.size ()/2 + 1), i = 0;
for (const 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 (const 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_OutboundTunnelsMutex);
for (const auto& it : m_OutboundTunnels)
if (it->IsEstablished ()) num++;
}
for (int i = num; i < m_NumOutboundTunnels; i++)
CreateOutboundTunnel ();
num = 0;
{
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
for (const auto& it : m_InboundTunnels)
if (it->IsEstablished ()) num++;
}
if (!num && !m_OutboundTunnels.empty () && m_NumOutboundHops > 0)
{
for (auto it: m_OutboundTunnels)
{
CreatePairedInboundTunnel (it);
num++;
if (num >= m_NumInboundTunnels) break;
}
}
for (int i = num; i < m_NumInboundTunnels; i++)
CreateInboundTunnel ();
if (num < m_NumInboundTunnels && m_NumInboundHops <= 0 && m_LocalDestination) // zero hops IB
m_LocalDestination->SetLeaseSetUpdated (); // update LeaseSet immediately
}
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void TunnelPool::TestTunnels ()
{
decltype(m_Tests) tests;
{
std::unique_lock<std::mutex> l(m_TestsMutex);
tests.swap(m_Tests);
}
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)
{
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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)
{
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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::ManageTunnels (uint64_t ts)
{
if (ts > m_NextManageTime)
{
CreateTunnels ();
TestTunnels ();
m_NextManageTime = ts + TUNNEL_POOL_MANAGE_INTERVAL + (rand () % TUNNEL_POOL_MANAGE_INTERVAL)/2;
}
}
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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{
uint64_t dlt = i2p::util::GetMillisecondsSinceEpoch () - timestamp;
LogPrint (eLogDebug, "Tunnels: test of ", msgID, " successful. ", dlt, " milliseconds");
uint64_t latency = dlt / 2;
// restore from test failed state if any
if (test.first)
{
if (test.first->GetState () == eTunnelStateTestFailed)
test.first->SetState (eTunnelStateEstablished);
// update latency
test.first->AddLatencySample(latency);
}
if (test.second)
{
if (test.second->GetState () == eTunnelStateTestFailed)
test.second->SetState (eTunnelStateEstablished);
// update latency
test.second->AddLatencySample(latency);
}
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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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}
bool TunnelPool::IsExploratory () const
{
return i2p::tunnel::tunnels.GetExploratoryPool () == shared_from_this ();
}
std::shared_ptr<const i2p::data::RouterInfo> TunnelPool::SelectNextHop (std::shared_ptr<const i2p::data::RouterInfo> prevHop, bool reverse) const
{
auto hop = IsExploratory () ? i2p::data::netdb.GetRandomRouter (prevHop, reverse):
i2p::data::netdb.GetHighBandwidthRandomRouter (prevHop, reverse);
if (!hop || hop->GetProfile ()->IsBad ())
hop = i2p::data::netdb.GetRandomRouter (prevHop, reverse);
return hop;
}
bool StandardSelectPeers(Path & path, int numHops, bool inbound, SelectHopFunc nextHop)
{
int start = 0;
std::shared_ptr<const i2p::data::RouterInfo> prevHop = i2p::context.GetSharedRouterInfo ();
if(i2p::transport::transports.RoutesRestricted())
{
/** if routes are restricted prepend trusted first hop */
auto hop = i2p::transport::transports.GetRestrictedPeer();
if(!hop) return false;
path.Add (hop);
prevHop = hop;
start++;
}
else if (i2p::transport::transports.GetNumPeers () > 100 ||
(inbound && i2p::transport::transports.GetNumPeers () > 25))
{
auto r = i2p::transport::transports.GetRandomPeer ();
if (r && r->IsECIES () && !r->GetProfile ()->IsBad () &&
(numHops > 1 || (r->IsV4 () && (!inbound || r->IsReachable ())))) // first inbound must be reachable
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{
prevHop = r;
path.Add (r);
start++;
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}
}
for(int i = start; i < numHops; i++ )
{
auto hop = nextHop (prevHop, inbound);
if (!hop && !i) // if no suitable peer found for first hop, try already connected
{
LogPrint (eLogInfo, "Tunnels: Can't select first hop for a tunnel. Trying already connected");
hop = i2p::transport::transports.GetRandomPeer ();
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if (hop && !hop->IsECIES ()) hop = nullptr;
}
if (!hop)
{
LogPrint (eLogError, "Tunnels: Can't select next hop for ", prevHop->GetIdentHashBase64 ());
return false;
}
if ((i == numHops - 1) && (!hop->IsV4 () || // doesn't support ipv4
(inbound && !hop->IsReachable ()))) // IBGW is not reachable
{
auto hop1 = nextHop (prevHop, true);
if (hop1) hop = hop1;
}
prevHop = hop;
path.Add (hop);
if (i == numHops - 1)
path.farEndTransports = hop->GetCompatibleTransports (inbound);
}
return true;
}
bool TunnelPool::SelectPeers (Path& path, bool isInbound)
{
int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
// peers is empty
if (numHops <= 0) return true;
// custom peer selector in use ?
{
std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex);
if (m_CustomPeerSelector)
return m_CustomPeerSelector->SelectPeers(path, numHops, isInbound);
}
// explicit peers in use
if (m_ExplicitPeers) return SelectExplicitPeers (path, isInbound);
return StandardSelectPeers(path, numHops, isInbound, std::bind(&TunnelPool::SelectNextHop, this, std::placeholders::_1, std::placeholders::_2));
}
bool TunnelPool::SelectExplicitPeers (Path& path, bool isInbound)
{
int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
if (numHops > (int)m_ExplicitPeers->size ()) numHops = m_ExplicitPeers->size ();
if (!numHops) return false;
for (int i = 0; i < numHops; i++)
{
auto& ident = (*m_ExplicitPeers)[i];
auto r = i2p::data::netdb.FindRouter (ident);
if (r)
{
if (r->IsECIES ())
{
path.Add (r);
if (i == numHops - 1)
path.farEndTransports = r->GetCompatibleTransports (isInbound);
}
else
{
LogPrint (eLogError, "Tunnels: ElGamal router ", ident.ToBase64 (), " is not supported");
return false;
}
}
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...");
Path path;
if (SelectPeers (path, true))
{
std::shared_ptr<TunnelConfig> config;
if (m_NumInboundHops > 0)
{
path.Reverse ();
config = std::make_shared<TunnelConfig> (path.peers, path.isShort, path.farEndTransports);
}
auto tunnel = tunnels.CreateInboundTunnel (config, shared_from_this (), outboundTunnel);
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)
{
if (IsExploratory () || tunnel->IsSlow ()) // always create new exploratory tunnel or if slow
{
CreateInboundTunnel ();
return;
}
auto outboundTunnel = GetNextOutboundTunnel ();
if (!outboundTunnel)
outboundTunnel = tunnels.GetNextOutboundTunnel ();
LogPrint (eLogDebug, "Tunnels: Re-creating destination inbound tunnel...");
std::shared_ptr<TunnelConfig> config;
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if (m_NumInboundHops > 0 && tunnel->GetPeers().size())
{
config = std::make_shared<TunnelConfig>(tunnel->GetPeers (), tunnel->IsShortBuildMessage ());
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}
if (!m_NumInboundHops || config)
{
auto newTunnel = tunnels.CreateInboundTunnel (config, shared_from_this(), outboundTunnel);
if (newTunnel->IsEstablished ()) // zero hops
TunnelCreated (newTunnel);
else
newTunnel->SetRecreated (true);
}
}
void TunnelPool::CreateOutboundTunnel ()
{
auto inboundTunnel = GetNextInboundTunnel ();
if (!inboundTunnel)
inboundTunnel = tunnels.GetNextInboundTunnel ();
if (inboundTunnel)
{
LogPrint (eLogDebug, "Tunnels: Creating destination outbound tunnel...");
Path path;
if (SelectPeers (path, false))
{
if (m_LocalDestination && !m_LocalDestination->SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
path.isShort = false; // because can't handle ECIES encrypted reply
std::shared_ptr<TunnelConfig> config;
if (m_NumOutboundHops > 0)
config = std::make_shared<TunnelConfig>(path.peers, inboundTunnel->GetNextTunnelID (),
inboundTunnel->GetNextIdentHash (), path.isShort, path.farEndTransports);
std::shared_ptr<OutboundTunnel> tunnel;
if (path.isShort)
{
// TODO: implement it better
tunnel = tunnels.CreateOutboundTunnel (config, inboundTunnel->GetTunnelPool ());
tunnel->SetTunnelPool (shared_from_this ());
}
else
tunnel = tunnels.CreateOutboundTunnel (config, shared_from_this ());
if (tunnel && 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)
{
if (IsExploratory () || tunnel->IsSlow ()) // always create new exploratory tunnel or if slow
{
CreateOutboundTunnel ();
return;
}
auto inboundTunnel = GetNextInboundTunnel ();
if (!inboundTunnel)
inboundTunnel = tunnels.GetNextInboundTunnel ();
if (inboundTunnel)
{
LogPrint (eLogDebug, "Tunnels: Re-creating destination outbound tunnel...");
std::shared_ptr<TunnelConfig> config;
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if (m_NumOutboundHops > 0 && tunnel->GetPeers().size())
{
config = std::make_shared<TunnelConfig>(tunnel->GetPeers (), inboundTunnel->GetNextTunnelID (),
inboundTunnel->GetNextIdentHash (), inboundTunnel->IsShortBuildMessage ());
}
if (!m_NumOutboundHops || config)
{
auto newTunnel = tunnels.CreateOutboundTunnel (config, 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 (
m_NumOutboundHops > 0 ? std::make_shared<TunnelConfig>(outboundTunnel->GetInvertedPeers (),
outboundTunnel->IsShortBuildMessage ()) : nullptr,
shared_from_this (), outboundTunnel);
if (tunnel->IsEstablished ()) // zero hops
TunnelCreated (tunnel);
}
void TunnelPool::SetCustomPeerSelector(ITunnelPeerSelector * selector)
{
std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex);
m_CustomPeerSelector = selector;
}
void TunnelPool::UnsetCustomPeerSelector()
{
SetCustomPeerSelector(nullptr);
}
bool TunnelPool::HasCustomPeerSelector()
{
std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex);
return m_CustomPeerSelector != nullptr;
}
std::shared_ptr<InboundTunnel> TunnelPool::GetLowestLatencyInboundTunnel(std::shared_ptr<InboundTunnel> exclude) const
{
std::shared_ptr<InboundTunnel> tun = nullptr;
std::unique_lock<std::mutex> lock(m_InboundTunnelsMutex);
uint64_t min = 1000000;
for (const auto & itr : m_InboundTunnels) {
if(!itr->LatencyIsKnown()) continue;
auto l = itr->GetMeanLatency();
if (l >= min) continue;
tun = itr;
if(tun == exclude) continue;
min = l;
}
return tun;
}
std::shared_ptr<OutboundTunnel> TunnelPool::GetLowestLatencyOutboundTunnel(std::shared_ptr<OutboundTunnel> exclude) const
{
std::shared_ptr<OutboundTunnel> tun = nullptr;
std::unique_lock<std::mutex> lock(m_OutboundTunnelsMutex);
uint64_t min = 1000000;
for (const auto & itr : m_OutboundTunnels) {
if(!itr->LatencyIsKnown()) continue;
auto l = itr->GetMeanLatency();
if (l >= min) continue;
tun = itr;
if(tun == exclude) continue;
min = l;
}
return tun;
}
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}
}