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292 lines
9.0 KiB
C++
292 lines
9.0 KiB
C++
/*
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* Copyright (c) 2013-2024, 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 I2PSERVICE_H__
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#define I2PSERVICE_H__
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#include <atomic>
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#include <mutex>
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#include <unordered_set>
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#include <memory>
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#include <boost/asio.hpp>
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#include "Destination.h"
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#include "Identity.h"
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#include "AddressBook.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 I2PServiceHandler;
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class I2PService : public std::enable_shared_from_this<I2PService>
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{
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public:
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typedef std::function<void(const boost::system::error_code &)> ReadyCallback;
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public:
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I2PService (std::shared_ptr<ClientDestination> localDestination = nullptr);
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I2PService (i2p::data::SigningKeyType kt);
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virtual ~I2PService ();
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inline void AddHandler (std::shared_ptr<I2PServiceHandler> conn)
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{
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std::unique_lock<std::mutex> l(m_HandlersMutex);
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m_Handlers.insert(conn);
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}
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inline void RemoveHandler (std::shared_ptr<I2PServiceHandler> conn)
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{
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std::unique_lock<std::mutex> l(m_HandlersMutex);
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m_Handlers.erase(conn);
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}
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void ClearHandlers ();
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void SetConnectTimeout(uint32_t timeout);
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void AddReadyCallback(ReadyCallback cb);
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inline std::shared_ptr<ClientDestination> GetLocalDestination () { return m_LocalDestination; }
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inline std::shared_ptr<const ClientDestination> GetLocalDestination () const { return m_LocalDestination; }
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inline void SetLocalDestination (std::shared_ptr<ClientDestination> dest)
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{
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if (m_LocalDestination) m_LocalDestination->Release ();
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if (dest) dest->Acquire ();
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m_LocalDestination = dest;
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}
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void CreateStream (StreamRequestComplete streamRequestComplete, const std::string& dest, uint16_t port = 0);
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void CreateStream(StreamRequestComplete complete, std::shared_ptr<const Address> address, uint16_t port);
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inline boost::asio::io_service& GetService () { return m_LocalDestination->GetService (); }
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virtual void Start () = 0;
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virtual void Stop () = 0;
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virtual const char* GetName() { return "Generic I2P Service"; }
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private:
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void TriggerReadyCheckTimer();
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void HandleReadyCheckTimer(const boost::system::error_code & ec);
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private:
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std::shared_ptr<ClientDestination> m_LocalDestination;
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std::unordered_set<std::shared_ptr<I2PServiceHandler> > m_Handlers;
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std::mutex m_HandlersMutex;
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std::vector<std::pair<ReadyCallback, uint32_t> > m_ReadyCallbacks;
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boost::asio::deadline_timer m_ReadyTimer;
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bool m_ReadyTimerTriggered;
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uint32_t m_ConnectTimeout;
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const size_t NEVER_TIMES_OUT = 0;
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public:
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bool isUpdated; // transient, used during reload only
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};
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/*Simple interface for I2PHandlers, allows detection of finalization amongst other things */
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class I2PServiceHandler
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{
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public:
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I2PServiceHandler(I2PService * parent) : m_Service(parent), m_Dead(false) { }
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virtual ~I2PServiceHandler() { }
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//If you override this make sure you call it from the children
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virtual void Handle() {}; //Start handling the socket
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virtual void Start () {};
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void Terminate () { Kill (); };
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protected:
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// Call when terminating or handing over to avoid race conditions
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inline bool Kill () { return m_Dead.exchange(true); }
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// Call to know if the handler is dead
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inline bool Dead () { return m_Dead; }
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// Call when done to clean up (make sure Kill is called first)
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inline void Done (std::shared_ptr<I2PServiceHandler> me) { if(m_Service) m_Service->RemoveHandler(me); }
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// Call to talk with the owner
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inline I2PService * GetOwner() { return m_Service; }
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private:
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I2PService *m_Service;
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std::atomic<bool> m_Dead; //To avoid cleaning up multiple times
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};
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const size_t SOCKETS_PIPE_BUFFER_SIZE = 8192 * 8;
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// bidirectional pipe for 2 stream sockets
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template<typename SocketUpstream, typename SocketDownstream>
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class SocketsPipe: public I2PServiceHandler,
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public std::enable_shared_from_this<SocketsPipe<SocketUpstream, SocketDownstream> >
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{
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public:
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SocketsPipe(I2PService * owner, std::shared_ptr<SocketUpstream> upstream, std::shared_ptr<SocketDownstream> downstream):
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I2PServiceHandler(owner), m_up(upstream), m_down(downstream)
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{
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boost::asio::socket_base::receive_buffer_size option(SOCKETS_PIPE_BUFFER_SIZE);
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upstream->set_option(option);
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downstream->set_option(option);
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}
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~SocketsPipe() { Terminate(); }
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void Start() override
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{
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Transfer (m_up, m_down, m_upstream_to_down_buf, SOCKETS_PIPE_BUFFER_SIZE); // receive from upstream
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Transfer (m_down, m_up, m_downstream_to_up_buf, SOCKETS_PIPE_BUFFER_SIZE); // receive from upstream
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}
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private:
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void Terminate()
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{
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if(Kill()) return;
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if (m_up)
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{
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if (m_up->is_open())
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m_up->close();
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m_up = nullptr;
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}
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if (m_down)
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{
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if (m_down->is_open())
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m_down->close();
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m_down = nullptr;
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}
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Done(SocketsPipe<SocketUpstream, SocketDownstream>::shared_from_this());
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}
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template<typename From, typename To>
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void Transfer (std::shared_ptr<From> from, std::shared_ptr<To> to, uint8_t * buf, size_t len)
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{
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if (!from || !to || !buf) return;
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auto s = SocketsPipe<SocketUpstream, SocketDownstream>::shared_from_this ();
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from->async_read_some(boost::asio::buffer(buf, len),
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[from, to, s, buf, len](const boost::system::error_code& ecode, std::size_t transferred)
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{
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if (ecode == boost::asio::error::operation_aborted) return;
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if (!ecode)
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{
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boost::asio::async_write(*to, boost::asio::buffer(buf, transferred), boost::asio::transfer_all(),
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[from, to, s, buf, len](const boost::system::error_code& ecode, std::size_t transferred)
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{
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(void) transferred;
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if (ecode == boost::asio::error::operation_aborted) return;
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if (!ecode)
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s->Transfer (from, to, buf, len);
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else
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{
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LogPrint(eLogWarning, "SocketsPipe: Write error:" , ecode.message());
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s->Terminate();
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}
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});
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}
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else
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{
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LogPrint(eLogWarning, "SocketsPipe: Read error:" , ecode.message());
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s->Terminate();
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}
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});
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}
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private:
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uint8_t m_upstream_to_down_buf[SOCKETS_PIPE_BUFFER_SIZE], m_downstream_to_up_buf[SOCKETS_PIPE_BUFFER_SIZE];
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std::shared_ptr<SocketUpstream> m_up;
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std::shared_ptr<SocketDownstream> m_down;
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};
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template<typename SocketUpstream, typename SocketDownstream>
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std::shared_ptr<I2PServiceHandler> CreateSocketsPipe (I2PService * owner, std::shared_ptr<SocketUpstream> upstream, std::shared_ptr<SocketDownstream> downstream)
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{
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return std::make_shared<SocketsPipe<SocketUpstream, SocketDownstream> >(owner, upstream, downstream);
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}
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//This is a service that listens for connections on the IP network or local socket and interacts with I2P
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template<typename Protocol>
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class ServiceAcceptor: public I2PService
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{
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public:
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ServiceAcceptor (const typename Protocol::endpoint& localEndpoint, std::shared_ptr<ClientDestination> localDestination = nullptr) :
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I2PService(localDestination), m_LocalEndpoint (localEndpoint) {}
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virtual ~ServiceAcceptor () { Stop(); }
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void Start () override
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{
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m_Acceptor.reset (new typename Protocol::acceptor (GetService (), m_LocalEndpoint));
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// update the local end point in case port has been set zero and got updated now
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m_LocalEndpoint = m_Acceptor->local_endpoint();
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m_Acceptor->listen ();
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Accept ();
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}
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void Stop () override
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{
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if (m_Acceptor)
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{
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m_Acceptor->close();
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m_Acceptor.reset (nullptr);
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}
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ClearHandlers();
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}
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const typename Protocol::endpoint& GetLocalEndpoint () const { return m_LocalEndpoint; };
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const char* GetName() override { return "Generic TCP/IP accepting daemon"; }
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protected:
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virtual std::shared_ptr<I2PServiceHandler> CreateHandler(std::shared_ptr<typename Protocol::socket> socket) = 0;
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private:
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void Accept()
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{
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auto newSocket = std::make_shared<typename Protocol::socket> (GetService ());
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m_Acceptor->async_accept (*newSocket,
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[newSocket, this](const boost::system::error_code& ecode)
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{
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if (ecode == boost::asio::error::operation_aborted) return;
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if (!ecode)
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{
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LogPrint(eLogDebug, "ServiceAcceptor: ", GetName(), " accepted");
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auto handler = CreateHandler(newSocket);
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if (handler)
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{
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AddHandler(handler);
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handler->Handle();
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}
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else
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newSocket->close();
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Accept();
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}
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else
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LogPrint (eLogError, "ServiceAcceptor: ", GetName(), " closing socket on accept because: ", ecode.message ());
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});
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}
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private:
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typename Protocol::endpoint m_LocalEndpoint;
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std::unique_ptr<typename Protocol::acceptor> m_Acceptor;
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};
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class TCPIPAcceptor: public ServiceAcceptor<boost::asio::ip::tcp>
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{
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public:
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TCPIPAcceptor (const std::string& address, uint16_t port, std::shared_ptr<ClientDestination> localDestination = nullptr) :
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ServiceAcceptor (boost::asio::ip::tcp::endpoint (boost::asio::ip::address::from_string(address), port), localDestination) {}
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};
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}
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}
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#endif
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