I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2022, 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 SSU2_H__
#define SSU2_H__
#include <unordered_map>
#include "util.h"
#include "SSU2Session.h"
namespace i2p
{
namespace transport
{
const int SSU2_TERMINATION_CHECK_TIMEOUT = 30; // in seconds
const int SSU2_RESEND_CHECK_TIMEOUT = 500; // in milliseconds
const size_t SSU2_SOCKET_RECEIVE_BUFFER_SIZE = 0x1FFFF; // 128K
const size_t SSU2_SOCKET_SEND_BUFFER_SIZE = 0x1FFFF; // 128K
const size_t SSU2_MAX_NUM_INTRODUCERS = 3;
const int SSU2_TO_INTRODUCER_SESSION_DURATION = 3600; // 1 hour
const int SSU2_TO_INTRODUCER_SESSION_EXPIRATION = 4800; // 80 minutes
const int SSU2_KEEP_ALIVE_INTERVAL = 30; // 30 seconds
class SSU2Server: private i2p::util::RunnableServiceWithWork
{
struct Packet
{
uint8_t buf[SSU2_MAX_PACKET_SIZE];
size_t len;
boost::asio::ip::udp::endpoint from;
};
class ReceiveService: public i2p::util::RunnableService
{
public:
ReceiveService (const std::string& name): RunnableService (name) {};
boost::asio::io_service& GetService () { return GetIOService (); };
void Start () { StartIOService (); };
void Stop () { StopIOService (); };
};
public:
SSU2Server ();
~SSU2Server () {};
void Start ();
void Stop ();
boost::asio::io_service& GetService () { return GetIOService (); };
void SetLocalAddress (const boost::asio::ip::address& localAddress);
bool IsSupported (const boost::asio::ip::address& addr) const;
uint16_t GetPort (bool v4) const;
void AddSession (std::shared_ptr<SSU2Session> session);
void RemoveSession (uint64_t connID);
void AddSessionByRouterHash (std::shared_ptr<SSU2Session> session);
bool AddPendingOutgoingSession (std::shared_ptr<SSU2Session> session);
void RemovePendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep);
std::shared_ptr<SSU2Session> FindSession (const i2p::data::IdentHash& ident) const;
std::shared_ptr<SSU2Session> FindPendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep) const;
std::shared_ptr<SSU2Session> GetRandomSession (i2p::data::RouterInfo::CompatibleTransports remoteTransports,
const i2p::data::IdentHash& excluded) const;
void AddRelay (uint32_t tag, std::shared_ptr<SSU2Session> relay);
void RemoveRelay (uint32_t tag);
std::shared_ptr<SSU2Session> FindRelaySession (uint32_t tag);
void Send (const uint8_t * header, size_t headerLen, const uint8_t * payload, size_t payloadLen,
const boost::asio::ip::udp::endpoint& to);
void Send (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen,
const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to);
bool CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router,
std::shared_ptr<const i2p::data::RouterInfo::Address> address, bool peerTest = false);
bool StartPeerTest (std::shared_ptr<const i2p::data::RouterInfo> router, bool v4);
void UpdateOutgoingToken (const boost::asio::ip::udp::endpoint& ep, uint64_t token, uint32_t exp);
uint64_t FindOutgoingToken (const boost::asio::ip::udp::endpoint& ep) const;
uint64_t GetIncomingToken (const boost::asio::ip::udp::endpoint& ep);
std::pair<uint64_t, uint32_t> NewIncomingToken (const boost::asio::ip::udp::endpoint& ep);
void RescheduleIntroducersUpdateTimer ();
void RescheduleIntroducersUpdateTimerV6 ();
private:
boost::asio::ip::udp::socket& OpenSocket (const boost::asio::ip::udp::endpoint& localEndpoint);
void Receive (boost::asio::ip::udp::socket& socket);
void HandleReceivedFrom (const boost::system::error_code& ecode, size_t bytes_transferred,
Packet * packet, boost::asio::ip::udp::socket& socket);
void HandleReceivedPacket (Packet * packet);
void HandleReceivedPackets (std::vector<Packet *> packets);
void ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
void ScheduleTermination ();
void HandleTerminationTimer (const boost::system::error_code& ecode);
void ScheduleResend ();
void HandleResendTimer (const boost::system::error_code& ecode);
void ConnectThroughIntroducer (std::shared_ptr<SSU2Session> session);
std::list<std::shared_ptr<SSU2Session> > FindIntroducers (int maxNumIntroducers,
bool v4, const std::set<i2p::data::IdentHash>& excluded) const;
void UpdateIntroducers (bool v4);
void ScheduleIntroducersUpdateTimer ();
void HandleIntroducersUpdateTimer (const boost::system::error_code& ecode, bool v4);
void ScheduleIntroducersUpdateTimerV6 ();
private:
ReceiveService m_ReceiveService;
boost::asio::ip::udp::socket m_SocketV4, m_SocketV6;
boost::asio::ip::address m_AddressV4, m_AddressV6;
std::unordered_map<uint64_t, std::shared_ptr<SSU2Session> > m_Sessions;
std::unordered_map<i2p::data::IdentHash, std::shared_ptr<SSU2Session> > m_SessionsByRouterHash;
std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSU2Session> > m_PendingOutgoingSessions;
std::map<boost::asio::ip::udp::endpoint, std::pair<uint64_t, uint32_t> > m_IncomingTokens, m_OutgoingTokens; // remote endpoint -> (token, expires in seconds)
std::map<uint32_t, std::shared_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session
std::list<i2p::data::IdentHash> m_Introducers, m_IntroducersV6; // introducers we are connected to
i2p::util::MemoryPoolMt<Packet> m_PacketsPool;
boost::asio::deadline_timer m_TerminationTimer, m_ResendTimer,
m_IntroducersUpdateTimer, m_IntroducersUpdateTimerV6;
std::shared_ptr<SSU2Session> m_LastSession;
bool m_IsPublished; // if we maintain introducers
public:
// for HTTP/I2PControl
const decltype(m_Sessions)& GetSSU2Sessions () const { return m_Sessions; };
};
}
}
#endif