I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2024, 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
virtual void Start () {};
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 SOCKETS_PIPE_BUFFER_SIZE = 8192 * 8;
// bidirectional pipe for 2 stream sockets
template<typename SocketUpstream, typename SocketDownstream>
class SocketsPipe: public I2PServiceHandler,
public std::enable_shared_from_this<SocketsPipe<SocketUpstream, SocketDownstream> >
{
public:
SocketsPipe(I2PService * owner, std::shared_ptr<SocketUpstream> upstream, std::shared_ptr<SocketDownstream> downstream):
I2PServiceHandler(owner), m_up(upstream), m_down(downstream)
{
boost::asio::socket_base::receive_buffer_size option(SOCKETS_PIPE_BUFFER_SIZE);
upstream->set_option(option);
downstream->set_option(option);
}
~SocketsPipe() { Terminate(); }
void Start() override
{
Transfer (m_up, m_down, m_upstream_to_down_buf, SOCKETS_PIPE_BUFFER_SIZE); // receive from upstream
Transfer (m_down, m_up, m_downstream_to_up_buf, SOCKETS_PIPE_BUFFER_SIZE); // receive from upstream
}
private:
void Terminate()
{
if(Kill()) return;
if (m_up)
{
if (m_up->is_open())
m_up->close();
m_up = nullptr;
}
if (m_down)
{
if (m_down->is_open())
m_down->close();
m_down = nullptr;
}
Done(SocketsPipe<SocketUpstream, SocketDownstream>::shared_from_this());
}
template<typename From, typename To>
void Transfer (std::shared_ptr<From> from, std::shared_ptr<To> to, uint8_t * buf, size_t len)
{
if (!from || !to || !buf) return;
auto s = SocketsPipe<SocketUpstream, SocketDownstream>::shared_from_this ();
from->async_read_some(boost::asio::buffer(buf, len),
[from, to, s, buf, len](const boost::system::error_code& ecode, std::size_t transferred)
{
if (ecode == boost::asio::error::operation_aborted) return;
if (!ecode)
{
boost::asio::async_write(*to, boost::asio::buffer(buf, transferred), boost::asio::transfer_all(),
[from, to, s, buf, len](const boost::system::error_code& ecode, std::size_t transferred)
{
(void) transferred;
if (ecode == boost::asio::error::operation_aborted) return;
if (!ecode)
s->Transfer (from, to, buf, len);
else
{
LogPrint(eLogWarning, "SocketsPipe: Write error:" , ecode.message());
s->Terminate();
}
});
}
else
{
LogPrint(eLogWarning, "SocketsPipe: Read error:" , ecode.message());
s->Terminate();
}
});
}
private:
uint8_t m_upstream_to_down_buf[SOCKETS_PIPE_BUFFER_SIZE], m_downstream_to_up_buf[SOCKETS_PIPE_BUFFER_SIZE];
std::shared_ptr<SocketUpstream> m_up;
std::shared_ptr<SocketDownstream> m_down;
};
template<typename SocketUpstream, typename SocketDownstream>
std::shared_ptr<I2PServiceHandler> CreateSocketsPipe (I2PService * owner, std::shared_ptr<SocketUpstream> upstream, std::shared_ptr<SocketDownstream> downstream)
{
return std::make_shared<SocketsPipe<SocketUpstream, SocketDownstream> >(owner, upstream, downstream);
}
//This is a service that listens for connections on the IP network or local socket and interacts with I2P
template<typename Protocol>
class ServiceAcceptor: public I2PService
{
public:
ServiceAcceptor (const typename Protocol::endpoint& localEndpoint, std::shared_ptr<ClientDestination> localDestination = nullptr) :
I2PService(localDestination), m_LocalEndpoint (localEndpoint) {}
virtual ~ServiceAcceptor () { Stop(); }
void Start () override
{
m_Acceptor.reset (new typename Protocol::acceptor (GetService (), m_LocalEndpoint));
// update the local end point in case port has been set zero and got updated now
m_LocalEndpoint = m_Acceptor->local_endpoint();
m_Acceptor->listen ();
Accept ();
}
void Stop () override
{
if (m_Acceptor)
{
m_Acceptor->close();
m_Acceptor.reset (nullptr);
}
ClearHandlers();
}
const typename Protocol::endpoint& GetLocalEndpoint () const { return m_LocalEndpoint; };
const char* GetName() override { return "Generic TCP/IP accepting daemon"; }
protected:
virtual std::shared_ptr<I2PServiceHandler> CreateHandler(std::shared_ptr<typename Protocol::socket> socket) = 0;
private:
void Accept()
{
auto newSocket = std::make_shared<typename Protocol::socket> (GetService ());
m_Acceptor->async_accept (*newSocket,
[newSocket, this](const boost::system::error_code& ecode)
{
if (ecode == boost::asio::error::operation_aborted) return;
if (!ecode)
{
LogPrint(eLogDebug, "ServiceAcceptor: ", GetName(), " accepted");
auto handler = CreateHandler(newSocket);
if (handler)
{
AddHandler(handler);
handler->Handle();
}
else
newSocket->close();
Accept();
}
else
LogPrint (eLogError, "ServiceAcceptor: ", GetName(), " closing socket on accept because: ", ecode.message ());
});
}
private:
typename Protocol::endpoint m_LocalEndpoint;
std::unique_ptr<typename Protocol::acceptor> m_Acceptor;
};
class TCPIPAcceptor: public ServiceAcceptor<boost::asio::ip::tcp>
{
public:
TCPIPAcceptor (const std::string& address, uint16_t port, std::shared_ptr<ClientDestination> localDestination = nullptr) :
ServiceAcceptor (boost::asio::ip::tcp::endpoint (boost::asio::ip::address::from_string(address), port), localDestination) {}
};
}
}
#endif