i2pd/BOB.h

#ifndef BOB_H__
#define BOB_H__

#include <inttypes.h>
#include <thread>
#include <memory>
#include <map>
#include <string>
#include <boost/asio.hpp>
#include "I2PTunnel.h"
#include "I2PService.h"
#include "Identity.h"
#include "LeaseSet.h"

namespace i2p
{
namespace client
{
	const size_t BOB_COMMAND_BUFFER_SIZE = 1024;
	const char BOB_COMMAND_ZAP[] = "zap";
	const char BOB_COMMAND_QUIT[] = "quit";
	const char BOB_COMMAND_START[] = "start";
	const char BOB_COMMAND_STOP[] = "stop";	
	const char BOB_COMMAND_SETNICK[] = "setnick";
	const char BOB_COMMAND_GETNICK[] = "getnick";		
	const char BOB_COMMAND_NEWKEYS[] = "newkeys";
	const char BOB_COMMAND_GETKEYS[] = "getkeys";
	const char BOB_COMMAND_SETKEYS[] = "setkeys";
	const char BOB_COMMAND_GETDEST[] = "getdest";
	const char BOB_COMMAND_OUTHOST[] = "outhost";	
	const char BOB_COMMAND_OUTPORT[] = "outport";
	const char BOB_COMMAND_INHOST[] = "inhost";	
	const char BOB_COMMAND_INPORT[] = "inport";
	const char BOB_COMMAND_QUIET[] = "quiet";
	const char BOB_COMMAND_LOOKUP[] = "lookup";	
	const char BOB_COMMAND_CLEAR[] = "clear";
	const char BOB_COMMAND_LIST[] = "list";
	const char BOB_COMMAND_OPTION[] = "option";
	const char BOB_COMMAND_STATUS[] = "status";	
	
	const char BOB_VERSION[] = "BOB 00.00.10\nOK\n";	
	const char BOB_REPLY_OK[] = "OK %s\n";
	const char BOB_REPLY_ERROR[] = "ERROR %s\n";
	const char BOB_DATA[] = "NICKNAME %s\n";

	const int BOB_SESSION_READINESS_CHECK_INTERVAL = 5; // in seconds

	class BOBI2PTunnel: public I2PService
	{
		public:

			BOBI2PTunnel (std::shared_ptr<ClientDestination> localDestination): 
				I2PService (localDestination) {};

			virtual void Start () {};
			virtual void Stop () {};				
	};	
	
	class BOBI2PInboundTunnel: public BOBI2PTunnel
	{
			struct AddressReceiver
			{
				std::shared_ptr<boost::asio::ip::tcp::socket> socket;
				char buffer[BOB_COMMAND_BUFFER_SIZE + 1]; // for destination base64 address
				uint8_t * data; // pointer to buffer
				size_t dataLen, bufferOffset; 

				AddressReceiver (): data (nullptr), dataLen (0), bufferOffset (0) {};
			};	
		
		public:

			BOBI2PInboundTunnel (int port, std::shared_ptr<ClientDestination> localDestination);
			~BOBI2PInboundTunnel ();

			void Start ();
			void Stop ();

		private:

			void Accept ();
			void HandleAccept (const boost::system::error_code& ecode, std::shared_ptr<AddressReceiver> receiver);

			void ReceiveAddress (std::shared_ptr<AddressReceiver> receiver);
			void HandleReceivedAddress (const boost::system::error_code& ecode, std::size_t bytes_transferred,
				std::shared_ptr<AddressReceiver> receiver);

			void HandleDestinationRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet, std::shared_ptr<AddressReceiver> receiver);

			void CreateConnection (std::shared_ptr<AddressReceiver> receiver, std::shared_ptr<const i2p::data::LeaseSet> leaseSet);

		private:

			boost::asio::ip::tcp::acceptor m_Acceptor;	
	};

	class BOBI2POutboundTunnel: public BOBI2PTunnel
	{
		public:

			 BOBI2POutboundTunnel (const std::string& address, int port, std::shared_ptr<ClientDestination> localDestination, bool quiet);	

			void Start ();
			void Stop ();

			void SetQuiet () { m_IsQuiet = true; };

		private:

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

		private:

			boost::asio::ip::tcp::endpoint m_Endpoint;	
			bool m_IsQuiet;	
	};


	class BOBDestination
	{
		public:

			BOBDestination (std::shared_ptr<ClientDestination> localDestination);
			~BOBDestination ();

			void Start ();
			void Stop ();
			void StopTunnels ();
			void CreateInboundTunnel (int port);
			void CreateOutboundTunnel (const std::string& address, int port, bool quiet);
			const i2p::data::PrivateKeys& GetKeys () const { return m_LocalDestination->GetPrivateKeys (); };
			std::shared_ptr<ClientDestination> GetLocalDestination () const { return m_LocalDestination; };
			
		private:	

			std::shared_ptr<ClientDestination> m_LocalDestination;
			BOBI2POutboundTunnel * m_OutboundTunnel;
			BOBI2PInboundTunnel * m_InboundTunnel;
	};	
	
	class BOBCommandChannel;
	class BOBCommandSession: public std::enable_shared_from_this<BOBCommandSession>
	{
		public:

			BOBCommandSession (BOBCommandChannel& owner);
			~BOBCommandSession ();	
			void Terminate ();

			boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
			void SendVersion ();

			// command handlers
			void ZapCommandHandler (const char * operand, size_t len);
			void QuitCommandHandler (const char * operand, size_t len);
			void StartCommandHandler (const char * operand, size_t len);
			void StopCommandHandler (const char * operand, size_t len);
			void SetNickCommandHandler (const char * operand, size_t len);
			void GetNickCommandHandler (const char * operand, size_t len);
			void NewkeysCommandHandler (const char * operand, size_t len);
			void SetkeysCommandHandler (const char * operand, size_t len);
			void GetkeysCommandHandler (const char * operand, size_t len);
			void GetdestCommandHandler (const char * operand, size_t len);
			void OuthostCommandHandler (const char * operand, size_t len);
			void OutportCommandHandler (const char * operand, size_t len);
			void InhostCommandHandler (const char * operand, size_t len);
			void InportCommandHandler (const char * operand, size_t len);			
			void QuietCommandHandler (const char * operand, size_t len);	
			void LookupCommandHandler (const char * operand, size_t len);
			void ClearCommandHandler (const char * operand, size_t len);
			void ListCommandHandler (const char * operand, size_t len);
			void OptionCommandHandler (const char * operand, size_t len);
			void StatusCommandHandler (const char * operand, size_t len);
			
		private:

			void Receive ();
			void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
			void HandleSessionReadinessCheckTimer (const boost::system::error_code& ecode);

			void Send (size_t len);
			void HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
			void SendReplyOK (const char * msg);
			void SendReplyError (const char * msg);
			void SendData (const char * nickname);

		private:

			BOBCommandChannel& m_Owner;
			boost::asio::ip::tcp::socket m_Socket;
			boost::asio::deadline_timer m_Timer;
			char m_ReceiveBuffer[BOB_COMMAND_BUFFER_SIZE + 1], m_SendBuffer[BOB_COMMAND_BUFFER_SIZE + 1];
			size_t m_ReceiveBufferOffset;
			bool m_IsOpen, m_IsQuiet;
			std::string m_Nickname, m_Address;
			int m_InPort, m_OutPort;
			i2p::data::PrivateKeys m_Keys;
			std::map<std::string, std::string> m_Options; 
			BOBDestination * m_CurrentDestination;
	};
	typedef void (BOBCommandSession::*BOBCommandHandler)(const char * operand, size_t len);

	class BOBCommandChannel
	{
		public:

			BOBCommandChannel (const std::string& address, int port);
			~BOBCommandChannel ();

			void Start ();
			void Stop ();

			boost::asio::io_service& GetService () { return m_Service; };
			void AddDestination (const std::string& name, BOBDestination * dest);
			void DeleteDestination (const std::string& name);
			BOBDestination * FindDestination (const std::string& name);
			
		private:

			void Run ();
			void Accept ();
			void HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<BOBCommandSession> session);

		private:

			bool m_IsRunning;
			std::thread * m_Thread;	
			boost::asio::io_service m_Service;
			boost::asio::ip::tcp::acceptor m_Acceptor;
			std::map<std::string, BOBDestination *> m_Destinations;
			std::map<std::string, BOBCommandHandler> m_CommandHandlers;

		public:

			const decltype(m_CommandHandlers)& GetCommandHandlers () const { return m_CommandHandlers; };
			const decltype(m_Destinations)& GetDestinations () const { return m_Destinations; };
	};	
}
}

#endif