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