mirror of
https://github.com/PurpleI2P/i2pd
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115 lines
3.9 KiB
C++
115 lines
3.9 KiB
C++
#ifndef DATAGRAM_H__
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#define DATAGRAM_H__
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#include <inttypes.h>
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#include <memory>
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#include <functional>
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#include <map>
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#include "Base.h"
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#include "Identity.h"
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#include "LeaseSet.h"
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#include "I2NPProtocol.h"
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#include "Garlic.h"
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namespace i2p
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{
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namespace client
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{
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class ClientDestination;
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}
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namespace datagram
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{
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// seconds interval for cleanup timer
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const int DATAGRAM_SESSION_CLEANUP_INTERVAL = 30;
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// milliseconds for max session idle time (10 minutes)
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const uint64_t DATAGRAM_SESSION_MAX_IDLE = 3600 * 1000;
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class DatagramSession
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{
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public:
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DatagramSession(i2p::client::ClientDestination * localDestination,
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const i2p::data::IdentHash & remoteIdent);
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/** send an i2np message to remote endpoint for this session */
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void SendMsg(std::shared_ptr<I2NPMessage> msg);
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/** get the last time in milliseconds for when we used this datagram session */
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uint64_t LastActivity() const { return m_LastUse; }
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private:
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/** get next usable routing path, try reusing outbound tunnels */
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std::shared_ptr<i2p::garlic::GarlicRoutingPath> GetNextRoutingPath();
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/**
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* mark current routing path as invalid and clear it
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* if the outbound tunnel we were using was okay don't use the IBGW in the routing path's lease next time
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*/
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void ResetRoutingPath();
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/** get next usable lease, does not fetch or update if expired or have no lease set */
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std::shared_ptr<const i2p::data::Lease> GetNextLease();
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void HandleSend(std::shared_ptr<I2NPMessage> msg);
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void HandleGotLeaseSet(std::shared_ptr<const i2p::data::LeaseSet> remoteIdent,
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std::shared_ptr<I2NPMessage> msg);
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void UpdateLeaseSet(std::shared_ptr<I2NPMessage> msg=nullptr);
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private:
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i2p::client::ClientDestination * m_LocalDestination;
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i2p::data::IdentHash m_RemoteIdentity;
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std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
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// Ident hash of IBGW that are invalid
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std::vector<i2p::data::IdentHash> m_InvalidIBGW;
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std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
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uint64_t m_LastUse;
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};
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const size_t MAX_DATAGRAM_SIZE = 32768;
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class DatagramDestination
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{
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typedef std::function<void (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len)> Receiver;
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public:
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DatagramDestination (std::shared_ptr<i2p::client::ClientDestination> owner);
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~DatagramDestination ();
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void SendDatagramTo (const uint8_t * payload, size_t len, const i2p::data::IdentHash& ident, uint16_t fromPort = 0, uint16_t toPort = 0);
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void HandleDataMessagePayload (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
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void SetReceiver (const Receiver& receiver) { m_Receiver = receiver; };
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void ResetReceiver () { m_Receiver = nullptr; };
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void SetReceiver (const Receiver& receiver, uint16_t port) { m_ReceiversByPorts[port] = receiver; };
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void ResetReceiver (uint16_t port) { m_ReceiversByPorts.erase (port); };
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private:
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// clean up after next tick
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void ScheduleCleanup();
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// clean up stale sessions and expire tags
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void HandleCleanUp(const boost::system::error_code & ecode);
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std::shared_ptr<DatagramSession> ObtainSession(const i2p::data::IdentHash & ident);
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std::shared_ptr<I2NPMessage> CreateDataMessage (const uint8_t * payload, size_t len, uint16_t fromPort, uint16_t toPort);
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void HandleDatagram (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
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private:
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i2p::client::ClientDestination * m_Owner;
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boost::asio::deadline_timer m_CleanupTimer;
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Receiver m_Receiver; // default
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std::mutex m_SessionsMutex;
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std::map<i2p::data::IdentHash, std::shared_ptr<DatagramSession> > m_Sessions;
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std::map<uint16_t, Receiver> m_ReceiversByPorts;
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i2p::data::GzipInflator m_Inflator;
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i2p::data::GzipDeflator m_Deflator;
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};
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}
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}
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#endif
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