mirror of
https://github.com/PurpleI2P/i2pd.git
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203 lines
7.8 KiB
C++
203 lines
7.8 KiB
C++
/*
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* Copyright (c) 2013-2021, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#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 <vector>
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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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namespace client {
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class ClientDestination;
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}
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namespace datagram {
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// milliseconds for max session idle time
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const uint64_t DATAGRAM_SESSION_MAX_IDLE = 10 * 60 * 1000;
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// milliseconds for how long we try sticking to a dead routing path before trying to switch
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const uint64_t DATAGRAM_SESSION_PATH_TIMEOUT = 10 * 1000;
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// milliseconds interval a routing path is used before switching
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const uint64_t DATAGRAM_SESSION_PATH_SWITCH_INTERVAL = 20 * 60 * 1000;
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// milliseconds before lease expire should we try switching leases
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const uint64_t DATAGRAM_SESSION_LEASE_HANDOVER_WINDOW = 30 * 1000;
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// milliseconds fudge factor for leases handover
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const uint64_t DATAGRAM_SESSION_LEASE_HANDOVER_FUDGE = 1000;
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// milliseconds minimum time between path switches
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const uint64_t DATAGRAM_SESSION_PATH_MIN_LIFETIME = 5 * 1000;
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// max 64 messages buffered in send queue for each datagram session
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const size_t DATAGRAM_SEND_QUEUE_MAX_SIZE = 64;
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class DatagramSession : public std::enable_shared_from_this<DatagramSession> {
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public:
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DatagramSession(std::shared_ptr<i2p::client::ClientDestination> localDestination,
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const i2p::data::IdentHash &remoteIdent);
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void Start();
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void Stop();
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/** @brief ack the garlic routing path */
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void Ack();
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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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void FlushSendQueue();
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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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bool IsRatchets() const { return m_RoutingSession && m_RoutingSession->IsRatchets(); }
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struct Info {
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std::shared_ptr<const i2p::data::IdentHash> IBGW;
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std::shared_ptr<const i2p::data::IdentHash> OBEP;
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const uint64_t activity;
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Info() : IBGW(nullptr), OBEP(nullptr), activity(0) {}
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Info(const uint8_t *ibgw, const uint8_t *obep, const uint64_t a) :
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activity(a) {
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if (ibgw) IBGW = std::make_shared<i2p::data::IdentHash>(ibgw);
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else IBGW = nullptr;
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if (obep) OBEP = std::make_shared<i2p::data::IdentHash>(obep);
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else OBEP = nullptr;
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}
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};
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Info GetSessionInfo() const;
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private:
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std::shared_ptr<i2p::garlic::GarlicRoutingPath> GetSharedRoutingPath();
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void HandleLeaseSetUpdated(std::shared_ptr<i2p::data::LeaseSet> ls);
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private:
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std::shared_ptr<i2p::client::ClientDestination> m_LocalDestination;
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i2p::data::IdentHash m_RemoteIdent;
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std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
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std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
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std::vector<std::shared_ptr<i2p::garlic::GarlicRoutingSession> > m_PendingRoutingSessions;
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std::vector<std::shared_ptr<I2NPMessage> > m_SendQueue;
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uint64_t m_LastUse;
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bool m_RequestingLS;
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};
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typedef std::shared_ptr<DatagramSession> DatagramSession_ptr;
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const size_t MAX_DATAGRAM_SIZE = 32768;
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class DatagramDestination {
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typedef std::function<void(const i2p::data::IdentityEx &from, uint16_t fromPort, uint16_t toPort,
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const uint8_t *buf, size_t len)> Receiver;
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typedef std::function<
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void (uint16_t
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fromPort,
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uint16_t toPort,
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const uint8_t *buf, size_t
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len)>
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RawReceiver;
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public:
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DatagramDestination(std::shared_ptr<i2p::client::ClientDestination> owner, bool gzip);
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~DatagramDestination();
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void
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SendDatagramTo(const uint8_t *payload, size_t len, const i2p::data::IdentHash &ident, uint16_t fromPort = 0,
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uint16_t toPort = 0);
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void SendRawDatagramTo(const uint8_t *payload, size_t len, const i2p::data::IdentHash &ident,
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uint16_t fromPort = 0, uint16_t toPort = 0);
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// TODO: implement calls from other thread from SAM
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std::shared_ptr<DatagramSession> GetSession(const i2p::data::IdentHash &ident);
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void SendDatagram(std::shared_ptr<DatagramSession> session, const uint8_t *payload, size_t len,
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uint16_t fromPort, uint16_t toPort);
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void SendRawDatagram(std::shared_ptr<DatagramSession> session, const uint8_t *payload, size_t len,
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uint16_t fromPort, uint16_t toPort);
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void FlushSendQueue(std::shared_ptr<DatagramSession> session);
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void HandleDataMessagePayload(uint16_t fromPort, uint16_t toPort, const uint8_t *buf, size_t len,
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bool isRaw = false);
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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) {
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std::lock_guard<std::mutex> lock(m_ReceiversMutex);
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m_ReceiversByPorts[port] = receiver;
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};
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void ResetReceiver(uint16_t port) {
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std::lock_guard<std::mutex> lock(m_ReceiversMutex);
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m_ReceiversByPorts.erase(port);
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};
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void SetRawReceiver(const RawReceiver &receiver) { m_RawReceiver = receiver; };
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void ResetRawReceiver() { m_RawReceiver = nullptr; };
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std::shared_ptr<DatagramSession::Info> GetInfoForRemote(const i2p::data::IdentHash &remote);
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// clean up stale sessions
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void CleanUp();
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private:
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std::shared_ptr<DatagramSession> ObtainSession(const i2p::data::IdentHash &ident);
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std::shared_ptr<I2NPMessage>
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CreateDataMessage(const std::vector<std::pair<const uint8_t *, size_t> > &payloads,
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uint16_t fromPort, uint16_t toPort, bool isRaw = false, bool checksum = true);
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void HandleDatagram(uint16_t fromPort, uint16_t toPort, uint8_t *const &buf, size_t len);
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void HandleRawDatagram(uint16_t fromPort, uint16_t toPort, const uint8_t *buf, size_t len);
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/** find a receiver by port, if none by port is found try default receiever, otherwise returns nullptr */
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Receiver FindReceiver(uint16_t port);
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private:
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std::shared_ptr<i2p::client::ClientDestination> m_Owner;
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Receiver m_Receiver; // default
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RawReceiver m_RawReceiver; // default
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bool m_Gzip; // gzip compression of data messages
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std::mutex m_SessionsMutex;
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std::map<i2p::data::IdentHash, DatagramSession_ptr> m_Sessions;
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std::mutex m_ReceiversMutex;
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std::map<uint16_t, Receiver> m_ReceiversByPorts;
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i2p::data::GzipInflator m_Inflator;
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std::unique_ptr<i2p::data::GzipDeflator> m_Deflator;
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std::vector<uint8_t> m_From, m_Signature;
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i2p::util::MemoryPool<I2NPMessageBuffer<I2NP_MAX_MESSAGE_SIZE> > m_I2NPMsgsPool;
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};
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}
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}
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#endif
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