I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef SAM_H__
#define SAM_H__
#include <inttypes.h>
#include <string>
#include <map>
#include <list>
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#include <thread>
#include <boost/asio.hpp>
#include "Streaming.h"
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namespace i2p
{
namespace stream
{
const size_t SAM_SOCKET_BUFFER_SIZE = 4096;
const int SAM_SOCKET_CONNECTION_MAX_IDLE = 3600; // in seconds
const char SAM_HANDSHAKE[] = "HELLO VERSION";
const char SAM_HANDSHAKE_REPLY[] = "HELLO REPLY RESULT=OK VERSION=3.1\n";
const char SAM_SESSION_CREATE[] = "SESSION CREATE";
const char SAM_SESSION_CREATE_REPLY_OK[] = "SESSION STATUS RESULT=OK DESTINATION=";
const char SAM_SESSION_CREATE_DUPLICATED_ID[] = "SESSION STATUS RESULT=DUPLICATED_ID\n";
const char SAM_STREAM_CONNECT[] = "STREAM CONNECT";
const char SAM_STREAM_STATUS_OK[] = "STREAM STATUS RESULT=OK\n";
const char SAM_STREAM_STATUS_INVALID_ID[] = "STREAM STATUS RESULT=INVALID_ID\n";
const char SAM_STREAM_STATUS_CANT_REACH_PEER[] = "STREAM STATUS RESULT=CANT_REACH_PEER\n";
const char SAM_STREAM_STATUS_I2P_ERROR[] = "STREAM STATUS RESULT=I2P_ERROR\n";
const char SAM_STREAM_ACCEPT[] = "STREAM ACCEPT";
const char SAM_PARAM_STYLE[] = "STYLE";
const char SAM_PARAM_ID[] = "ID";
const char SAM_PARAM_DESTINATION[] = "DESTINATION";
const char SAM_VALUE_TRANSIENT[] = "TRANSIENT";
enum SAMSocketType
{
eSAMSocketTypeUnknown,
eSAMSocketTypeSession,
eSAMSocketTypeStream,
eSAMSocketTypeAcceptor
};
class SAMBridge;
class SAMSocket
{
public:
SAMSocket (SAMBridge& owner);
~SAMSocket ();
boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
void ReceiveHandshake ();
private:
void Terminate ();
void HandleHandshakeReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleHandshakeReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleMessage (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void SendMessageReply (const char * msg, size_t len, bool close);
void HandleMessageReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred, bool close);
void Receive ();
void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void I2PReceive ();
void HandleI2PReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleI2PAccept (i2p::stream::Stream * stream);
void HandleWriteI2PData (const boost::system::error_code& ecode);
void ProcessSessionCreate (char * buf, size_t len);
void ProcessStreamConnect (char * buf, size_t len);
void ProcessStreamAccept (char * buf, size_t len);
void ExtractParams (char * buf, size_t len, std::map<std::string, std::string>& params);
private:
SAMBridge& m_Owner;
boost::asio::ip::tcp::socket m_Socket;
char m_Buffer[SAM_SOCKET_BUFFER_SIZE + 1];
uint8_t m_StreamBuffer[SAM_SOCKET_BUFFER_SIZE];
SAMSocketType m_SocketType;
std::string m_ID; // nickname
Stream * m_Stream;
};
struct SAMSession
{
StreamingDestination * localDestination;
std::list<SAMSocket *> sockets;
bool isTransient;
};
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class SAMBridge
{
public:
SAMBridge (int port);
~SAMBridge ();
void Start ();
void Stop ();
boost::asio::io_service& GetService () { return m_Service; };
SAMSession * CreateSession (const std::string& id, const std::string& destination = ""); // empty string means transient
void CloseSession (const std::string& id);
SAMSession * FindSession (const std::string& id);
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private:
void Run ();
void Accept ();
void HandleAccept(const boost::system::error_code& ecode);
private:
bool m_IsRunning;
std::thread * m_Thread;
boost::asio::io_service m_Service;
boost::asio::ip::tcp::acceptor m_Acceptor;
SAMSocket * m_NewSocket;
std::map<std::string, SAMSession> m_Sessions;
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};
}
}
#endif