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/*
* 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
*/
#ifndef TRANSPORTS_H__
#define TRANSPORTS_H__
#include <thread>
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#include <mutex>
#include <condition_variable>
#include <functional>
#include <unordered_map>
#include <vector>
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#include <queue>
#include <string>
#include <memory>
#include <atomic>
#include <boost/asio.hpp>
#include "TransportSession.h"
#include "SSU2.h"
#include "NTCP2.h"
#include "RouterInfo.h"
#include "I2NPProtocol.h"
#include "Identity.h"
#include "util.h"
namespace i2p
{
namespace transport
{
template<typename Keys>
class EphemeralKeysSupplier
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{
// called from this file only, so implementation is in Transports.cpp
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public:
EphemeralKeysSupplier (int size);
~EphemeralKeysSupplier ();
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void Start ();
void Stop ();
std::shared_ptr<Keys> Acquire ();
void Return (std::shared_ptr<Keys> pair);
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private:
void Run ();
void CreateEphemeralKeys (int num);
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private:
const int m_QueueSize;
std::queue<std::shared_ptr<Keys> > m_Queue;
i2p::util::MemoryPoolMt<Keys> m_KeysPool;
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bool m_IsRunning;
std::unique_ptr<std::thread> m_Thread;
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std::condition_variable m_Acquired;
std::mutex m_AcquiredMutex;
};
typedef EphemeralKeysSupplier<i2p::crypto::X25519Keys> X25519KeysPairSupplier;
const int PEER_ROUTER_INFO_UPDATE_INTERVAL = 31*60; // in seconds
const int PEER_ROUTER_INFO_UPDATE_INTERVAL_VARIANCE = 7*60; // in seconds
const size_t PEER_ROUTER_INFO_OVERLOAD_QUEUE_SIZE = 25;
const int PEER_SELECTION_MIN_INTERVAL = 20; // in seconds
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struct Peer
{
int numAttempts;
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std::shared_ptr<const i2p::data::RouterInfo> router;
std::list<std::shared_ptr<TransportSession> > sessions;
uint64_t creationTime, nextRouterInfoUpdateTime, lastSelectionTime;
std::list<std::shared_ptr<i2p::I2NPMessage> > delayedMessages;
std::vector<i2p::data::RouterInfo::SupportedTransports> priority;
bool isHighBandwidth, isEligible;
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Peer (std::shared_ptr<const i2p::data::RouterInfo> r, uint64_t ts):
numAttempts (0), router (r), creationTime (ts),
nextRouterInfoUpdateTime (ts + PEER_ROUTER_INFO_UPDATE_INTERVAL),
lastSelectionTime (0), isHighBandwidth (false), isEligible (false)
{
UpdateParams (router);
}
void Done ()
{
for (auto& it: sessions)
it->Done ();
// drop not sent delayed messages
for (auto& it: delayedMessages)
it->Drop ();
}
void SetRouter (std::shared_ptr<const i2p::data::RouterInfo> r)
{
router = r;
UpdateParams (router);
}
bool IsConnected () const { return !sessions.empty (); }
void UpdateParams (std::shared_ptr<const i2p::data::RouterInfo> router);
};
const uint64_t SESSION_CREATION_TIMEOUT = 15; // in seconds
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const int PEER_TEST_INTERVAL = 71; // in minutes
const int PEER_TEST_DELAY_INTERVAL = 20; // in milliseconds
const int PEER_TEST_DELAY_INTERVAL_VARIANCE = 30; // in milliseconds
const int MAX_NUM_DELAYED_MESSAGES = 150;
const int CHECK_PROFILE_NUM_DELAYED_MESSAGES = 15; // check profile after
const int NUM_X25519_PRE_GENERATED_KEYS = 25; // pre-generated x25519 keys pairs
const int TRAFFIC_SAMPLE_COUNT = 301; // seconds
struct TrafficSample
{
uint64_t Timestamp;
uint64_t TotalReceivedBytes;
uint64_t TotalSentBytes;
uint64_t TotalTransitTransmittedBytes;
};
class Transports
{
public:
Transports ();
~Transports ();
void Start (bool enableNTCP2=true, bool enableSSU2=true);
void Stop ();
bool IsRunning () const { return m_IsRunning; }
bool IsBoundSSU2() const { return m_SSU2Server != nullptr; }
bool IsBoundNTCP2() const { return m_NTCP2Server != nullptr; }
bool IsOnline() const { return m_IsOnline; };
void SetOnline (bool online);
auto& GetService () { return *m_Service; };
std::shared_ptr<i2p::crypto::X25519Keys> GetNextX25519KeysPair ();
void ReuseX25519KeysPair (std::shared_ptr<i2p::crypto::X25519Keys> pair);
void SendMessage (const i2p::data::IdentHash& ident, std::shared_ptr<i2p::I2NPMessage> msg);
void SendMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >& msgs);
void SendMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >&& msgs);
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void PeerConnected (std::shared_ptr<TransportSession> session);
void PeerDisconnected (std::shared_ptr<TransportSession> session);
bool IsConnected (const i2p::data::IdentHash& ident) const;
void UpdateSentBytes (uint64_t numBytes) { m_TotalSentBytes += numBytes; };
void UpdateReceivedBytes (uint64_t numBytes) { m_TotalReceivedBytes += numBytes; };
uint64_t GetTotalSentBytes () const { return m_TotalSentBytes; };
uint64_t GetTotalReceivedBytes () const { return m_TotalReceivedBytes; };
uint64_t GetTotalTransitTransmittedBytes () const { return m_TotalTransitTransmittedBytes; }
void UpdateTotalTransitTransmittedBytes (uint32_t add) { m_TotalTransitTransmittedBytes += add; };
uint32_t GetInBandwidth () const { return m_InBandwidth; };
uint32_t GetOutBandwidth () const { return m_OutBandwidth; };
uint32_t GetTransitBandwidth () const { return m_TransitBandwidth; };
uint32_t GetInBandwidth15s () const { return m_InBandwidth15s; };
uint32_t GetOutBandwidth15s () const { return m_OutBandwidth15s; };
uint32_t GetTransitBandwidth15s () const { return m_TransitBandwidth15s; };
int GetCongestionLevel (bool longTerm) const;
size_t GetNumPeers () const { return m_Peers.size (); };
std::shared_ptr<const i2p::data::RouterInfo> GetRandomPeer (bool isHighBandwidth) const;
/** get a trusted first hop for restricted routes */
std::shared_ptr<const i2p::data::RouterInfo> GetRestrictedPeer() const;
/** do we want to use restricted routes? */
bool RoutesRestricted() const;
/** restrict routes to use only these router families for first hops */
void RestrictRoutesToFamilies(const std::set<std::string>& families);
/** restrict routes to use only these routers for first hops */
void RestrictRoutesToRouters(const std::set<i2p::data::IdentHash>& routers);
bool IsRestrictedPeer(const i2p::data::IdentHash & ident) const;
void PeerTest (bool ipv4 = true, bool ipv6 = true);
void SetCheckReserved (bool check) { m_CheckReserved = check; };
bool IsCheckReserved () const { return m_CheckReserved; };
bool IsInReservedRange (const boost::asio::ip::address& host) const;
private:
void Run ();
void RequestComplete (std::shared_ptr<const i2p::data::RouterInfo> r, const i2p::data::IdentHash& ident);
void HandleRequestComplete (std::shared_ptr<const i2p::data::RouterInfo> r, i2p::data::IdentHash ident);
void PostMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >& msgs);
bool ConnectToPeer (const i2p::data::IdentHash& ident, std::shared_ptr<Peer> peer);
void SetPriority (std::shared_ptr<Peer> peer) const;
void HandlePeerCleanupTimer (const boost::system::error_code& ecode);
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void HandlePeerTestTimer (const boost::system::error_code& ecode);
void HandleUpdateBandwidthTimer (const boost::system::error_code& ecode);
void UpdateBandwidthValues (int interval, uint32_t& in, uint32_t& out, uint32_t& transit);
void DetectExternalIP ();
template<typename Filter>
std::shared_ptr<const i2p::data::RouterInfo> GetRandomPeer (Filter filter) const;
private:
volatile bool m_IsOnline;
bool m_IsRunning, m_IsNAT, m_CheckReserved;
std::thread * m_Thread;
boost::asio::io_context * m_Service;
boost::asio::executor_work_guard<boost::asio::io_context::executor_type> * m_Work;
boost::asio::deadline_timer * m_PeerCleanupTimer, * m_PeerTestTimer, * m_UpdateBandwidthTimer;
SSU2Server * m_SSU2Server;
NTCP2Server * m_NTCP2Server;
mutable std::mutex m_PeersMutex;
std::unordered_map<i2p::data::IdentHash, std::shared_ptr<Peer> > m_Peers;
X25519KeysPairSupplier m_X25519KeysPairSupplier;
std::atomic<uint64_t> m_TotalSentBytes, m_TotalReceivedBytes, m_TotalTransitTransmittedBytes;
TrafficSample m_TrafficSamples[TRAFFIC_SAMPLE_COUNT];
int m_TrafficSamplePtr;
// Bandwidth per second
uint32_t m_InBandwidth, m_OutBandwidth, m_TransitBandwidth;
// Bandwidth during last 15 seconds
uint32_t m_InBandwidth15s, m_OutBandwidth15s, m_TransitBandwidth15s;
// Bandwidth during last 5 minutes
uint32_t m_InBandwidth5m, m_OutBandwidth5m, m_TransitBandwidth5m;
/** which router families to trust for first hops */
std::vector<i2p::data::FamilyID> m_TrustedFamilies;
mutable std::mutex m_FamilyMutex;
/** which routers for first hop to trust */
std::vector<i2p::data::IdentHash> m_TrustedRouters;
mutable std::mutex m_TrustedRoutersMutex;
i2p::I2NPMessagesHandler m_LoopbackHandler;
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public:
// for HTTP only
const NTCP2Server * GetNTCP2Server () const { return m_NTCP2Server; };
const SSU2Server * GetSSU2Server () const { return m_SSU2Server; };
const decltype(m_Peers)& GetPeers () const { return m_Peers; };
};
extern Transports transports;
void InitAddressFromIface ();
void InitTransports ();
}
}
#endif