I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef NTCP_SESSION_H__
#define NTCP_SESSION_H__
#include <inttypes.h>
#include <list>
#include <memory>
#include <cryptopp/modes.h>
#include <cryptopp/aes.h>
#include <cryptopp/adler32.h>
#include "aes.h"
#include "Identity.h"
#include "RouterInfo.h"
#include "I2NPProtocol.h"
#include "TransportSession.h"
namespace i2p
{
namespace transport
{
#pragma pack(1)
struct NTCPPhase1
{
uint8_t pubKey[256];
uint8_t HXxorHI[32];
};
struct NTCPPhase2
{
uint8_t pubKey[256];
struct
{
uint8_t hxy[32];
uint32_t timestamp;
uint8_t filler[12];
} encrypted;
};
#pragma pack()
const size_t NTCP_MAX_MESSAGE_SIZE = 16384;
const size_t NTCP_BUFFER_SIZE = 1040; // fits one tunnel message (1028)
const int NTCP_TERMINATION_TIMEOUT = 120; // 2 minutes
const size_t NTCP_DEFAULT_PHASE3_SIZE = 2/*size*/ + i2p::data::DEFAULT_IDENTITY_SIZE/*387*/ + 4/*ts*/ + 15/*padding*/ + 40/*signature*/; // 448
class NTCPSession: public TransportSession, public std::enable_shared_from_this<NTCPSession>
{
public:
NTCPSession (boost::asio::io_service& service, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr);
~NTCPSession ();
void Terminate ();
boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
bool IsEstablished () const { return m_IsEstablished; };
void ClientLogin ();
void ServerLogin ();
void SendI2NPMessage (I2NPMessage * msg);
size_t GetNumSentBytes () const { return m_NumSentBytes; };
size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
protected:
void Connected ();
void SendTimeSyncMessage ();
void SetIsEstablished (bool isEstablished) { m_IsEstablished = isEstablished; }
private:
void CreateAESKey (uint8_t * pubKey, i2p::crypto::AESKey& key);
// client
void SendPhase3 ();
void HandlePhase1Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandlePhase2Received (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandlePhase3Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA);
void HandlePhase4Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA);
//server
void SendPhase2 ();
void SendPhase4 (uint32_t tsA, uint32_t tsB);
void HandlePhase1Received (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandlePhase2Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB);
void HandlePhase3Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB);
void HandlePhase3ExtraReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB, size_t paddingLen);
void HandlePhase3 (uint32_t tsB, size_t paddingLen);
void HandlePhase4Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
// common
void Receive ();
void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
bool DecryptNextBlock (const uint8_t * encrypted);
void Send (i2p::I2NPMessage * msg);
void HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, i2p::I2NPMessage * msg);
// timer
void ScheduleTermination ();
void HandleTerminationTimer (const boost::system::error_code& ecode);
private:
boost::asio::ip::tcp::socket m_Socket;
boost::asio::deadline_timer m_TerminationTimer;
bool m_IsEstablished;
i2p::crypto::CBCDecryption m_Decryption;
i2p::crypto::CBCEncryption m_Encryption;
CryptoPP::Adler32 m_Adler;
struct Establisher
{
NTCPPhase1 phase1;
NTCPPhase2 phase2;
} * m_Establisher;
i2p::crypto::AESAlignedBuffer<NTCP_BUFFER_SIZE + 16> m_ReceiveBuffer;
i2p::crypto::AESAlignedBuffer<16> m_TimeSyncBuffer;
int m_ReceiveBufferOffset;
i2p::I2NPMessage * m_NextMessage;
std::list<i2p::I2NPMessage *> m_DelayedMessages;
size_t m_NextMessageOffset;
size_t m_NumSentBytes, m_NumReceivedBytes;
};
}
}
#endif