I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef SSU_H__
#define SSU_H__
#include <inttypes.h>
#include <string.h>
#include <map>
#include <list>
#include <set>
#include <thread>
#include <mutex>
#include <boost/asio.hpp>
#include "Crypto.h"
#include "I2PEndian.h"
#include "Identity.h"
#include "RouterInfo.h"
#include "I2NPProtocol.h"
#include "SSUSession.h"
namespace i2p
{
namespace transport
{
const int SSU_KEEP_ALIVE_INTERVAL = 30; // 30 seconds
const int SSU_PEER_TEST_TIMEOUT = 60; // 60 seconds
const int SSU_TO_INTRODUCER_SESSION_DURATION = 3600; // 1 hour
const size_t SSU_MAX_NUM_INTRODUCERS = 3;
struct SSUPacket
{
i2p::crypto::AESAlignedBuffer<1500> buf;
boost::asio::ip::udp::endpoint from;
size_t len;
};
class SSUServer
{
public:
SSUServer (int port);
~SSUServer ();
void Start ();
void Stop ();
void CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest = false);
std::shared_ptr<SSUSession> FindSession (std::shared_ptr<const i2p::data::RouterInfo> router) const;
std::shared_ptr<SSUSession> FindSession (const boost::asio::ip::udp::endpoint& e) const;
std::shared_ptr<SSUSession> GetRandomEstablishedSession (std::shared_ptr<const SSUSession> excluded);
void DeleteSession (std::shared_ptr<SSUSession> session);
void DeleteAllSessions ();
boost::asio::io_service& GetService () { return m_Service; };
boost::asio::io_service& GetServiceV6 () { return m_ServiceV6; };
const boost::asio::ip::udp::endpoint& GetEndpoint () const { return m_Endpoint; };
void Send (const uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& to);
void AddRelay (uint32_t tag, const boost::asio::ip::udp::endpoint& relay);
std::shared_ptr<SSUSession> FindRelaySession (uint32_t tag);
void NewPeerTest (uint32_t nonce, PeerTestParticipant role, std::shared_ptr<SSUSession> session = nullptr);
PeerTestParticipant GetPeerTestParticipant (uint32_t nonce);
std::shared_ptr<SSUSession> GetPeerTestSession (uint32_t nonce);
void UpdatePeerTest (uint32_t nonce, PeerTestParticipant role);
void RemovePeerTest (uint32_t nonce);
private:
void Run ();
void RunV6 ();
void RunReceivers ();
void Receive ();
void ReceiveV6 ();
void HandleReceivedFrom (const boost::system::error_code& ecode, std::size_t bytes_transferred, SSUPacket * packet);
void HandleReceivedFromV6 (const boost::system::error_code& ecode, std::size_t bytes_transferred, SSUPacket * packet);
void HandleReceivedPackets (std::vector<SSUPacket *> packets);
void CreateSessionThroughIntroducer (std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest = false);
void CreateDirectSession (std::shared_ptr<const i2p::data::RouterInfo> router, boost::asio::ip::udp::endpoint remoteEndpoint, bool peerTest);
template<typename Filter>
std::shared_ptr<SSUSession> GetRandomSession (Filter filter);
std::set<SSUSession *> FindIntroducers (int maxNumIntroducers);
void ScheduleIntroducersUpdateTimer ();
void HandleIntroducersUpdateTimer (const boost::system::error_code& ecode);
void SchedulePeerTestsCleanupTimer ();
void HandlePeerTestsCleanupTimer (const boost::system::error_code& ecode);
private:
struct PeerTest
{
uint64_t creationTime;
PeerTestParticipant role;
std::shared_ptr<SSUSession> session; // for Bob to Alice
};
bool m_IsRunning;
std::thread * m_Thread, * m_ThreadV6, * m_ReceiversThread;
boost::asio::io_service m_Service, m_ServiceV6, m_ReceiversService;
boost::asio::io_service::work m_Work, m_WorkV6, m_ReceiversWork;
boost::asio::ip::udp::endpoint m_Endpoint, m_EndpointV6;
boost::asio::ip::udp::socket m_Socket, m_SocketV6;
boost::asio::deadline_timer m_IntroducersUpdateTimer, m_PeerTestsCleanupTimer;
std::list<boost::asio::ip::udp::endpoint> m_Introducers; // introducers we are connected to
mutable std::mutex m_SessionsMutex;
std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSUSession> > m_Sessions;
std::map<uint32_t, boost::asio::ip::udp::endpoint> m_Relays; // we are introducer
std::map<uint32_t, PeerTest> m_PeerTests; // nonce -> creation time in milliseconds
public:
// for HTTP only
const decltype(m_Sessions)& GetSessions () const { return m_Sessions; };
};
}
}
#endif