i2pd/I2PTunnel.h

#ifndef I2PTUNNEL_H__
#define I2PTUNNEL_H__

#include <inttypes.h>
#include <string>
#include <set>
#include <memory>
#include <sstream>
#include <boost/asio.hpp>
#include "Identity.h"
#include "Destination.h"
#include "Streaming.h"
#include "I2PService.h"

namespace i2p
{
namespace client
{
    const size_t I2P_TUNNEL_CONNECTION_BUFFER_SIZE = 8192;
    const int I2P_TUNNEL_CONNECTION_MAX_IDLE = 3600; // in seconds  
    const int I2P_TUNNEL_DESTINATION_REQUEST_TIMEOUT = 10; // in seconds


    class I2PTunnelConnection: public I2PServiceHandler, public std::enable_shared_from_this<I2PTunnelConnection>
    {
        public:

            I2PTunnelConnection (I2PService * owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket,
                std::shared_ptr<const i2p::data::LeaseSet> leaseSet, int port = 0); // to I2P
            I2PTunnelConnection (I2PService * owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket,
                std::shared_ptr<i2p::stream::Stream> stream); // to I2P using simplified API 
            I2PTunnelConnection (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream,  std::shared_ptr<boost::asio::ip::tcp::socket> socket, 
                const boost::asio::ip::tcp::endpoint& target, bool quiet = true); // from I2P
            ~I2PTunnelConnection ();
            void I2PConnect (const uint8_t * msg = nullptr, size_t len = 0);
            void Connect ();
            
        protected:

            void Terminate ();  

            void Receive ();
            void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);    
            virtual void Write (const uint8_t * buf, size_t len); // can be overloaded
            void HandleWrite (const boost::system::error_code& ecode);  

            void StreamReceive ();
            void HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred);
            void HandleConnect (const boost::system::error_code& ecode);

        private:

            uint8_t m_Buffer[I2P_TUNNEL_CONNECTION_BUFFER_SIZE], m_StreamBuffer[I2P_TUNNEL_CONNECTION_BUFFER_SIZE];
            std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
            std::shared_ptr<i2p::stream::Stream> m_Stream;
            boost::asio::ip::tcp::endpoint m_RemoteEndpoint;
            bool m_IsQuiet; // don't send destination
    };

    class I2PTunnelConnectionHTTP: public I2PTunnelConnection
    {
        public:
            
            I2PTunnelConnectionHTTP (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream,
                std::shared_ptr<boost::asio::ip::tcp::socket> socket, 
                const boost::asio::ip::tcp::endpoint& target, const std::string& host); 

        protected:

            void Write (const uint8_t * buf, size_t len);

        private:
        
            std::string m_Host;
            std::stringstream m_InHeader, m_OutHeader;
            bool m_HeaderSent;
    };

    class I2PClientTunnel: public TCPIPAcceptor
    {
        protected:

            // Implements TCPIPAcceptor
            std::shared_ptr<I2PServiceHandler> CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket);
            const char* GetName() { return "I2P Client Tunnel"; }

        public:

            I2PClientTunnel (const std::string& destination, int port, std::shared_ptr<ClientDestination> localDestination, int destinationPort = 0);
            ~I2PClientTunnel () {}
    
            void Start ();
            void Stop ();

        private:

            const i2p::data::IdentHash * GetIdentHash ();

            std::string m_Destination;
            const i2p::data::IdentHash * m_DestinationIdentHash;
            int m_DestinationPort;  
    };  

    class I2PServerTunnel: public I2PService
    {
        public:

            I2PServerTunnel (const std::string& address, int port, 
                std::shared_ptr<ClientDestination> localDestination, int inport = 0);   

            void Start ();
            void Stop ();

            void SetAccessList (const std::set<i2p::data::IdentHash>& accessList); 

            const std::string& GetAddress() const { return m_Address; }
            int GetPort () const { return m_Port; };
            const boost::asio::ip::tcp::endpoint& GetEndpoint () const { return m_Endpoint; }

        private:

            void HandleResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it, 
                std::shared_ptr<boost::asio::ip::tcp::resolver> resolver);

            void Accept ();
            void HandleAccept (std::shared_ptr<i2p::stream::Stream> stream);
            virtual void CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream);

        private:

            std::string m_Address;
            int m_Port;
            boost::asio::ip::tcp::endpoint m_Endpoint;  
            std::shared_ptr<i2p::stream::StreamingDestination> m_PortDestination;
            std::set<i2p::data::IdentHash> m_AccessList;
            bool m_IsAccessList;            
    };

    class I2PServerTunnelHTTP: public I2PServerTunnel
    {
        public:

            I2PServerTunnelHTTP (const std::string& address, int port, 
                std::shared_ptr<ClientDestination> localDestination, int inport = 0);   

        private:

            void CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream); 
    };
}
}   

#endif