I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2023, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#ifndef I2PSERVICE_H__
#define I2PSERVICE_H__
#include <atomic>
#include <mutex>
#include <unordered_set>
#include <memory>
#include <boost/asio.hpp>
#include "Destination.h"
#include "Identity.h"
#include "AddressBook.h"
namespace i2p
{
namespace client
{
class I2PServiceHandler;
class I2PService : public std::enable_shared_from_this<I2PService>
{
public:
typedef std::function<void(const boost::system::error_code &)> ReadyCallback;
public:
I2PService (std::shared_ptr<ClientDestination> localDestination = nullptr);
I2PService (i2p::data::SigningKeyType kt);
virtual ~I2PService ();
inline void AddHandler (std::shared_ptr<I2PServiceHandler> conn)
{
std::unique_lock<std::mutex> l(m_HandlersMutex);
m_Handlers.insert(conn);
}
inline void RemoveHandler (std::shared_ptr<I2PServiceHandler> conn)
{
std::unique_lock<std::mutex> l(m_HandlersMutex);
m_Handlers.erase(conn);
}
void ClearHandlers ();
void SetConnectTimeout(uint32_t timeout);
void AddReadyCallback(ReadyCallback cb);
inline std::shared_ptr<ClientDestination> GetLocalDestination () { return m_LocalDestination; }
inline std::shared_ptr<const ClientDestination> GetLocalDestination () const { return m_LocalDestination; }
inline void SetLocalDestination (std::shared_ptr<ClientDestination> dest)
{
if (m_LocalDestination) m_LocalDestination->Release ();
if (dest) dest->Acquire ();
m_LocalDestination = dest;
}
void CreateStream (StreamRequestComplete streamRequestComplete, const std::string& dest, uint16_t port = 0);
void CreateStream(StreamRequestComplete complete, std::shared_ptr<const Address> address, uint16_t port);
inline boost::asio::io_service& GetService () { return m_LocalDestination->GetService (); }
virtual void Start () = 0;
virtual void Stop () = 0;
virtual const char* GetName() { return "Generic I2P Service"; }
private:
void TriggerReadyCheckTimer();
void HandleReadyCheckTimer(const boost::system::error_code & ec);
private:
std::shared_ptr<ClientDestination> m_LocalDestination;
std::unordered_set<std::shared_ptr<I2PServiceHandler> > m_Handlers;
std::mutex m_HandlersMutex;
std::vector<std::pair<ReadyCallback, uint32_t> > m_ReadyCallbacks;
boost::asio::deadline_timer m_ReadyTimer;
bool m_ReadyTimerTriggered;
uint32_t m_ConnectTimeout;
const size_t NEVER_TIMES_OUT = 0;
public:
bool isUpdated; // transient, used during reload only
};
/*Simple interface for I2PHandlers, allows detection of finalization amongst other things */
class I2PServiceHandler
{
public:
I2PServiceHandler(I2PService * parent) : m_Service(parent), m_Dead(false) { }
virtual ~I2PServiceHandler() { }
//If you override this make sure you call it from the children
virtual void Handle() {}; //Start handling the socket
void Terminate () { Kill (); };
protected:
// Call when terminating or handing over to avoid race conditions
inline bool Kill () { return m_Dead.exchange(true); }
// Call to know if the handler is dead
inline bool Dead () { return m_Dead; }
// Call when done to clean up (make sure Kill is called first)
inline void Done (std::shared_ptr<I2PServiceHandler> me) { if(m_Service) m_Service->RemoveHandler(me); }
// Call to talk with the owner
inline I2PService * GetOwner() { return m_Service; }
private:
I2PService *m_Service;
std::atomic<bool> m_Dead; //To avoid cleaning up multiple times
};
const size_t TCP_IP_PIPE_BUFFER_SIZE = 8192 * 8;
// bidirectional pipe for 2 tcp/ip sockets
class TCPIPPipe: public I2PServiceHandler, public std::enable_shared_from_this<TCPIPPipe>
{
public:
TCPIPPipe(I2PService * owner, std::shared_ptr<boost::asio::ip::tcp::socket> upstream, std::shared_ptr<boost::asio::ip::tcp::socket> downstream);
~TCPIPPipe();
void Start();
protected:
void Terminate();
void AsyncReceiveUpstream();
void AsyncReceiveDownstream();
void HandleUpstreamReceived(const boost::system::error_code & ecode, std::size_t bytes_transferred);
void HandleDownstreamReceived(const boost::system::error_code & ecode, std::size_t bytes_transferred);
void HandleUpstreamWrite(const boost::system::error_code & ecode);
void HandleDownstreamWrite(const boost::system::error_code & ecode);
void UpstreamWrite(size_t len);
void DownstreamWrite(size_t len);
private:
uint8_t m_upstream_to_down_buf[TCP_IP_PIPE_BUFFER_SIZE], m_downstream_to_up_buf[TCP_IP_PIPE_BUFFER_SIZE];
uint8_t m_upstream_buf[TCP_IP_PIPE_BUFFER_SIZE], m_downstream_buf[TCP_IP_PIPE_BUFFER_SIZE];
std::shared_ptr<boost::asio::ip::tcp::socket> m_up, m_down;
};
/* TODO: support IPv6 too */
//This is a service that listens for connections on the IP network and interacts with I2P
class TCPIPAcceptor: public I2PService
{
public:
TCPIPAcceptor (const std::string& address, uint16_t port, std::shared_ptr<ClientDestination> localDestination = nullptr) :
I2PService(localDestination),
m_LocalEndpoint (boost::asio::ip::address::from_string(address), port),
m_Timer (GetService ()) {}
TCPIPAcceptor (const std::string& address, uint16_t port, i2p::data::SigningKeyType kt) :
I2PService(kt),
m_LocalEndpoint (boost::asio::ip::address::from_string(address), port),
m_Timer (GetService ()) {}
virtual ~TCPIPAcceptor () { TCPIPAcceptor::Stop(); }
//If you override this make sure you call it from the children
void Start ();
//If you override this make sure you call it from the children
void Stop ();
const boost::asio::ip::tcp::endpoint& GetLocalEndpoint () const { return m_LocalEndpoint; };
virtual const char* GetName() { return "Generic TCP/IP accepting daemon"; }
protected:
virtual std::shared_ptr<I2PServiceHandler> CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket) = 0;
private:
void Accept();
void HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<boost::asio::ip::tcp::socket> socket);
boost::asio::ip::tcp::endpoint m_LocalEndpoint;
std::unique_ptr<boost::asio::ip::tcp::acceptor> m_Acceptor;
boost::asio::deadline_timer m_Timer;
};
}
}
#endif