mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
821 lines
25 KiB
821 lines
25 KiB
/* |
|
* Copyright (c) 2013-2024, 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 "I2PEndian.h" |
|
#include "Crypto.h" |
|
#include "Tunnel.h" |
|
#include "NetDb.hpp" |
|
#include "Timestamp.h" |
|
#include "Garlic.h" |
|
#include "Transports.h" |
|
#include "Log.h" |
|
#include "Tunnel.h" |
|
#include "TunnelPool.h" |
|
#include "Destination.h" |
|
|
|
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, int inboundVariance, int outboundVariance): |
|
m_NumInboundHops (numInboundHops), m_NumOutboundHops (numOutboundHops), |
|
m_NumInboundTunnels (numInboundTunnels), m_NumOutboundTunnels (numOutboundTunnels), |
|
m_InboundVariance (inboundVariance), m_OutboundVariance (outboundVariance), |
|
m_IsActive (true), m_CustomPeerSelector(nullptr), m_Rng(m_Rd()) |
|
{ |
|
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; |
|
if (m_InboundVariance < 0 && m_NumInboundHops + m_InboundVariance <= 0) |
|
m_InboundVariance = m_NumInboundHops ? -m_NumInboundHops + 1 : 0; |
|
if (m_OutboundVariance < 0 && m_NumOutboundHops + m_OutboundVariance <= 0) |
|
m_OutboundVariance = m_NumOutboundHops ? -m_NumOutboundHops + 1 : 0; |
|
if (m_InboundVariance > 0 && m_NumInboundHops + m_InboundVariance > STANDARD_NUM_RECORDS) |
|
m_InboundVariance = (m_NumInboundHops < STANDARD_NUM_RECORDS) ? STANDARD_NUM_RECORDS - m_NumInboundHops : 0; |
|
if (m_OutboundVariance > 0 && m_NumOutboundHops + m_OutboundVariance > STANDARD_NUM_RECORDS) |
|
m_OutboundVariance = (m_NumOutboundHops < STANDARD_NUM_RECORDS) ? STANDARD_NUM_RECORDS - m_NumOutboundHops : 0; |
|
m_NextManageTime = i2p::util::GetSecondsSinceEpoch () + rand () % TUNNEL_POOL_MANAGE_INTERVAL; |
|
} |
|
|
|
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 been adjusted to ", size, " for explicit peers"); |
|
} |
|
if (m_NumOutboundHops > size) |
|
{ |
|
m_NumOutboundHops = size; |
|
LogPrint (eLogInfo, "Tunnels: Outbound tunnel length has been adjusted to ", size, " for explicit peers"); |
|
} |
|
m_NumInboundTunnels = 1; |
|
m_NumOutboundTunnels = 1; |
|
} |
|
} |
|
|
|
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 (); |
|
} |
|
|
|
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, |
|
i2p::data::RouterInfo::CompatibleTransports compatible) const |
|
{ |
|
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
|
return GetNextTunnel (m_OutboundTunnels, excluded, compatible); |
|
} |
|
|
|
std::shared_ptr<InboundTunnel> TunnelPool::GetNextInboundTunnel (std::shared_ptr<InboundTunnel> excluded, |
|
i2p::data::RouterInfo::CompatibleTransports compatible) const |
|
{ |
|
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
|
return GetNextTunnel (m_InboundTunnels, excluded, compatible); |
|
} |
|
|
|
template<class TTunnels> |
|
typename TTunnels::value_type TunnelPool::GetNextTunnel (TTunnels& tunnels, |
|
typename TTunnels::value_type excluded, i2p::data::RouterInfo::CompatibleTransports compatible) 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 && (compatible & it->GetFarEndTransports ())) |
|
{ |
|
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++; |
|
} |
|
num = m_NumOutboundTunnels - num; |
|
if (num > 0) |
|
{ |
|
if (num > TUNNEL_POOL_MAX_NUM_BUILD_REQUESTS) num = TUNNEL_POOL_MAX_NUM_BUILD_REQUESTS; |
|
for (int i = 0; i < num; 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 && |
|
m_NumInboundHops == m_NumOutboundHops) |
|
{ |
|
for (auto it: m_OutboundTunnels) |
|
{ |
|
// try to create inbound tunnel through the same path as successive outbound |
|
CreatePairedInboundTunnel (it); |
|
num++; |
|
if (num >= m_NumInboundTunnels) break; |
|
} |
|
} |
|
num = m_NumInboundTunnels - num; |
|
if (num > 0) |
|
{ |
|
if (num > TUNNEL_POOL_MAX_NUM_BUILD_REQUESTS) num = TUNNEL_POOL_MAX_NUM_BUILD_REQUESTS; |
|
for (int i = 0; i < num; i++) |
|
CreateInboundTunnel (); |
|
} |
|
|
|
if (num < m_NumInboundTunnels && m_NumInboundHops <= 0 && m_LocalDestination) // zero hops IB |
|
m_LocalDestination->SetLeaseSetUpdated (); // update LeaseSet immediately |
|
} |
|
|
|
void TunnelPool::TestTunnels () |
|
{ |
|
decltype(m_Tests) tests; |
|
{ |
|
std::unique_lock<std::mutex> l(m_TestsMutex); |
|
tests.swap(m_Tests); |
|
} |
|
|
|
for (auto& it: tests) |
|
{ |
|
LogPrint (eLogWarning, "Tunnels: Test of tunnel ", 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); |
|
} |
|
if (m_LocalDestination) |
|
m_LocalDestination->SetLeaseSetUpdated (); |
|
} |
|
else |
|
it.second.second->SetState (eTunnelStateTestFailed); |
|
} |
|
} |
|
|
|
// new tests |
|
std::vector<std::pair<std::shared_ptr<OutboundTunnel>, std::shared_ptr<InboundTunnel> > > newTests; |
|
std::vector<std::shared_ptr<OutboundTunnel> > outboundTunnels; |
|
{ |
|
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
|
for (auto& it: m_OutboundTunnels) |
|
if (it->IsEstablished () || it->GetState () == eTunnelStateTestFailed) |
|
outboundTunnels.push_back (it); |
|
} |
|
std::shuffle (outboundTunnels.begin(), outboundTunnels.end(), m_Rng); |
|
std::vector<std::shared_ptr<InboundTunnel> > inboundTunnels; |
|
{ |
|
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
|
for (auto& it: m_InboundTunnels) |
|
if (it->IsEstablished () || it->GetState () == eTunnelStateTestFailed) |
|
inboundTunnels.push_back (it); |
|
} |
|
std::shuffle (inboundTunnels.begin(), inboundTunnels.end(), m_Rng); |
|
auto it1 = outboundTunnels.begin (); |
|
auto it2 = inboundTunnels.begin (); |
|
while (it1 != outboundTunnels.end () && it2 != inboundTunnels.end ()) |
|
{ |
|
newTests.push_back(std::make_pair (*it1, *it2)); |
|
++it1; ++it2; |
|
} |
|
for (auto& it: newTests) |
|
{ |
|
uint32_t msgID; |
|
RAND_bytes ((uint8_t *)&msgID, 4); |
|
{ |
|
std::unique_lock<std::mutex> l(m_TestsMutex); |
|
m_Tests[msgID] = it; |
|
} |
|
auto msg = CreateDeliveryStatusMsg (msgID); |
|
auto outbound = it.first; |
|
auto s = shared_from_this (); |
|
msg->onDrop = [msgID, outbound, s]() |
|
{ |
|
// if test msg dropped locally it's outbound tunnel to blame |
|
outbound->SetState (eTunnelStateFailed); |
|
{ |
|
std::unique_lock<std::mutex> l(s->m_TestsMutex); |
|
s->m_Tests.erase (msgID); |
|
} |
|
{ |
|
std::unique_lock<std::mutex> l(s->m_OutboundTunnelsMutex); |
|
s->m_OutboundTunnels.erase (outbound); |
|
} |
|
}; |
|
outbound->SendTunnelDataMsgTo (it.second->GetNextIdentHash (), it.second->GetNextTunnelID (), msg); |
|
} |
|
} |
|
|
|
void TunnelPool::ManageTunnels (uint64_t ts) |
|
{ |
|
if (ts > m_NextManageTime || ts + 2*TUNNEL_POOL_MANAGE_INTERVAL < m_NextManageTime) // in case if clock was adjusted |
|
{ |
|
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) |
|
{ |
|
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) |
|
{ |
|
uint64_t dlt = i2p::util::GetMillisecondsSinceEpoch () - timestamp; |
|
LogPrint (eLogDebug, "Tunnels: Test of ", msgID, " successful. ", dlt, " milliseconds"); |
|
int numHops = 0; |
|
if (test.first) numHops += test.first->GetNumHops (); |
|
if (test.second) numHops += test.second->GetNumHops (); |
|
// restore from test failed state if any |
|
if (test.first) |
|
{ |
|
if (test.first->GetState () != eTunnelStateExpiring) |
|
test.first->SetState (eTunnelStateEstablished); |
|
// update latency |
|
uint64_t latency = 0; |
|
if (numHops) latency = dlt*test.first->GetNumHops ()/numHops; |
|
if (!latency) latency = dlt/2; |
|
test.first->AddLatencySample(latency); |
|
} |
|
if (test.second) |
|
{ |
|
if (test.second->GetState () != eTunnelStateExpiring) |
|
test.second->SetState (eTunnelStateEstablished); |
|
// update latency |
|
uint64_t latency = 0; |
|
if (numHops) latency = dlt*test.second->GetNumHops ()/numHops; |
|
if (!latency) latency = dlt/2; |
|
test.second->AddLatencySample(latency); |
|
} |
|
} |
|
else |
|
{ |
|
if (m_LocalDestination) |
|
m_LocalDestination->ProcessDeliveryStatusMessage (msg); |
|
else |
|
LogPrint (eLogWarning, "Tunnels: Local destination doesn't exist, dropped"); |
|
} |
|
} |
|
|
|
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, bool endpoint) const |
|
{ |
|
auto hop = IsExploratory () ? i2p::data::netdb.GetRandomRouter (prevHop, reverse, endpoint): |
|
i2p::data::netdb.GetHighBandwidthRandomRouter (prevHop, reverse, endpoint); |
|
|
|
if (!hop || hop->GetProfile ()->IsBad ()) |
|
hop = i2p::data::netdb.GetRandomRouter (prevHop, reverse, endpoint); |
|
return hop; |
|
} |
|
|
|
bool TunnelPool::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 (!IsExploratory ()); |
|
if (r && r->IsECIES () && !r->GetProfile ()->IsBad () && |
|
(numHops > 1 || (r->IsV4 () && (!inbound || r->IsPublished (true))))) // first inbound must be published ipv4 |
|
{ |
|
prevHop = r; |
|
path.Add (r); |
|
start++; |
|
} |
|
} |
|
|
|
for(int i = start; i < numHops; i++ ) |
|
{ |
|
auto hop = nextHop (prevHop, inbound, i == numHops - 1); |
|
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 (false); |
|
if (hop && !hop->IsECIES ()) hop = nullptr; |
|
} |
|
if (!hop) |
|
{ |
|
LogPrint (eLogError, "Tunnels: Can't select next hop for ", prevHop->GetIdentHashBase64 ()); |
|
return false; |
|
} |
|
prevHop = hop; |
|
path.Add (hop); |
|
} |
|
path.farEndTransports = prevHop->GetCompatibleTransports (inbound); // last hop |
|
return true; |
|
} |
|
|
|
bool TunnelPool::SelectPeers (Path& path, bool isInbound) |
|
{ |
|
// explicit peers in use |
|
if (m_ExplicitPeers) return SelectExplicitPeers (path, isInbound); |
|
// calculate num hops |
|
int numHops; |
|
if (isInbound) |
|
{ |
|
numHops = m_NumInboundHops; |
|
if (m_InboundVariance) |
|
{ |
|
int offset = rand () % (std::abs (m_InboundVariance) + 1); |
|
if (m_InboundVariance < 0) offset = -offset; |
|
numHops += offset; |
|
} |
|
} |
|
else |
|
{ |
|
numHops = m_NumOutboundHops; |
|
if (m_OutboundVariance) |
|
{ |
|
int offset = rand () % (std::abs (m_OutboundVariance) + 1); |
|
if (m_OutboundVariance < 0) offset = -offset; |
|
numHops += offset; |
|
} |
|
} |
|
// 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); |
|
} |
|
return StandardSelectPeers(path, numHops, isInbound, std::bind(&TunnelPool::SelectNextHop, this, |
|
std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)); |
|
} |
|
|
|
bool TunnelPool::SelectExplicitPeers (Path& path, bool isInbound) |
|
{ |
|
if (!m_ExplicitPeers->size ()) return false; |
|
int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops; |
|
if (numHops > (int)m_ExplicitPeers->size ()) numHops = m_ExplicitPeers->size (); |
|
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 () |
|
{ |
|
LogPrint (eLogDebug, "Tunnels: Creating destination inbound tunnel..."); |
|
Path path; |
|
if (SelectPeers (path, true)) |
|
{ |
|
auto outboundTunnel = GetNextOutboundTunnel (nullptr, path.farEndTransports); |
|
if (!outboundTunnel) |
|
outboundTunnel = tunnels.GetNextOutboundTunnel (); |
|
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"); |
|
} |
|
|
|
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 (nullptr, tunnel->GetFarEndTransports ()); |
|
if (!outboundTunnel) |
|
outboundTunnel = tunnels.GetNextOutboundTunnel (); |
|
LogPrint (eLogDebug, "Tunnels: Re-creating destination inbound tunnel..."); |
|
std::shared_ptr<TunnelConfig> config; |
|
if (m_NumInboundHops > 0) |
|
{ |
|
auto peers = tunnel->GetPeers(); |
|
if (peers.size ()&& ValidatePeers (peers)) |
|
config = std::make_shared<TunnelConfig>(tunnel->GetPeers (), |
|
tunnel->IsShortBuildMessage (), tunnel->GetFarEndTransports ()); |
|
} |
|
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 () |
|
{ |
|
LogPrint (eLogDebug, "Tunnels: Creating destination outbound tunnel..."); |
|
Path path; |
|
if (SelectPeers (path, false)) |
|
{ |
|
auto inboundTunnel = GetNextInboundTunnel (nullptr, path.farEndTransports); |
|
if (!inboundTunnel) |
|
inboundTunnel = tunnels.GetNextInboundTunnel (); |
|
if (!inboundTunnel) |
|
{ |
|
LogPrint (eLogError, "Tunnels: Can't create outbound tunnel, no inbound tunnels found"); |
|
return; |
|
} |
|
|
|
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"); |
|
} |
|
|
|
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 (nullptr, tunnel->GetFarEndTransports ()); |
|
if (!inboundTunnel) |
|
inboundTunnel = tunnels.GetNextInboundTunnel (); |
|
if (inboundTunnel) |
|
{ |
|
LogPrint (eLogDebug, "Tunnels: Re-creating destination outbound tunnel..."); |
|
std::shared_ptr<TunnelConfig> config; |
|
if (m_NumOutboundHops > 0) |
|
{ |
|
auto peers = tunnel->GetPeers(); |
|
if (peers.size () && ValidatePeers (peers)) |
|
config = std::make_shared<TunnelConfig>(peers, inboundTunnel->GetNextTunnelID (), |
|
inboundTunnel->GetNextIdentHash (), inboundTunnel->IsShortBuildMessage (), tunnel->GetFarEndTransports ()); |
|
} |
|
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; |
|
} |
|
|
|
bool TunnelPool::ValidatePeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers) const |
|
{ |
|
bool highBandwidth = !IsExploratory (); |
|
for (auto it: peers) |
|
{ |
|
auto r = i2p::data::netdb.FindRouter (it->GetIdentHash ()); |
|
if (r) |
|
{ |
|
if (r->IsHighCongestion (highBandwidth)) return false; |
|
it = r->GetIdentity (); // use identity from updated RouterInfo |
|
} |
|
} |
|
return true; |
|
} |
|
|
|
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; |
|
} |
|
} |
|
}
|
|
|