i2pd/NTCPSession.h

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#ifndef NTCP_SESSION_H__
#define NTCP_SESSION_H__
#include <inttypes.h>
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#include <map>
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#include <memory>
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#include <thread>
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#include <mutex>
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#include <boost/asio.hpp>
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#include <cryptopp/modes.h>
#include <cryptopp/aes.h>
#include <cryptopp/adler32.h>
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#include "aes.h"
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#include "Identity.h"
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#include "RouterInfo.h"
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#include "I2NPProtocol.h"
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#include "TransportSession.h"
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namespace i2p
{
namespace transport
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{
#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;
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const size_t NTCP_BUFFER_SIZE = 4160; // fits 4 tunnel messages (4*1028)
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const int NTCP_TERMINATION_TIMEOUT = 120; // 2 minutes
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const size_t NTCP_DEFAULT_PHASE3_SIZE = 2/*size*/ + i2p::data::DEFAULT_IDENTITY_SIZE/*387*/ + 4/*ts*/ + 15/*padding*/ + 40/*signature*/; // 448
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const int NTCP_BAN_EXPIRATION_TIMEOUT = 70; // in second
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class NTCPServer;
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class NTCPSession: public TransportSession, public std::enable_shared_from_this<NTCPSession>
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{
public:
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NTCPSession (NTCPServer& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr);
~NTCPSession ();
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void Terminate ();
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void Done ();
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boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
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bool IsEstablished () const { return m_IsEstablished; };
void ClientLogin ();
void ServerLogin ();
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void SendI2NPMessage (I2NPMessage * msg);
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void SendI2NPMessages (const std::vector<I2NPMessage *>& msgs);
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private:
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void PostI2NPMessage (I2NPMessage * msg);
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void PostI2NPMessages (std::vector<I2NPMessage *> msgs);
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void Connected ();
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void SendTimeSyncMessage ();
void SetIsEstablished (bool isEstablished) { m_IsEstablished = isEstablished; }
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void CreateAESKey (uint8_t * pubKey, i2p::crypto::AESKey& key);
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// 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 ();
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void SendPhase4 (uint32_t tsA, uint32_t tsB);
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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);
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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);
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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);
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bool DecryptNextBlock (const uint8_t * encrypted);
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void Send (i2p::I2NPMessage * msg);
boost::asio::const_buffers_1 CreateMsgBuffer (I2NPMessage * msg);
void Send (const std::vector<I2NPMessage *>& msgs);
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void HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, std::vector<I2NPMessage *> msgs);
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// timer
void ScheduleTermination ();
void HandleTerminationTimer (const boost::system::error_code& ecode);
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private:
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NTCPServer& m_Server;
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boost::asio::ip::tcp::socket m_Socket;
boost::asio::deadline_timer m_TerminationTimer;
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bool m_IsEstablished, m_IsTerminated;
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i2p::crypto::CBCDecryption m_Decryption;
i2p::crypto::CBCEncryption m_Encryption;
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CryptoPP::Adler32 m_Adler;
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struct Establisher
{
NTCPPhase1 phase1;
NTCPPhase2 phase2;
} * m_Establisher;
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i2p::crypto::AESAlignedBuffer<NTCP_BUFFER_SIZE + 16> m_ReceiveBuffer;
i2p::crypto::AESAlignedBuffer<16> m_TimeSyncBuffer;
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int m_ReceiveBufferOffset;
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i2p::I2NPMessage * m_NextMessage;
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size_t m_NextMessageOffset;
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i2p::I2NPMessagesHandler m_Handler;
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bool m_IsSending;
std::vector<I2NPMessage *> m_SendQueue;
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boost::asio::ip::address m_ConnectedFrom; // for ban
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};
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// TODO: move to NTCP.h/.cpp
class NTCPServer
{
public:
NTCPServer (int port);
~NTCPServer ();
void Start ();
void Stop ();
void AddNTCPSession (std::shared_ptr<NTCPSession> session);
void RemoveNTCPSession (std::shared_ptr<NTCPSession> session);
std::shared_ptr<NTCPSession> FindNTCPSession (const i2p::data::IdentHash& ident);
void Connect (const boost::asio::ip::address& address, int port, std::shared_ptr<NTCPSession> conn);
boost::asio::io_service& GetService () { return m_Service; };
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void Ban (const boost::asio::ip::address& addr);
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private:
void Run ();
void HandleAccept (std::shared_ptr<NTCPSession> conn, const boost::system::error_code& error);
void HandleAcceptV6 (std::shared_ptr<NTCPSession> conn, const boost::system::error_code& error);
void HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCPSession> conn);
private:
bool m_IsRunning;
std::thread * m_Thread;
boost::asio::io_service m_Service;
boost::asio::io_service::work m_Work;
boost::asio::ip::tcp::acceptor * m_NTCPAcceptor, * m_NTCPV6Acceptor;
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std::mutex m_NTCPSessionsMutex;
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std::map<i2p::data::IdentHash, std::shared_ptr<NTCPSession> > m_NTCPSessions;
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std::map<boost::asio::ip::address, uint32_t> m_BanList; // IP -> ban expiration time in seconds
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public:
// for HTTP/I2PControl
const decltype(m_NTCPSessions)& GetNTCPSessions () const { return m_NTCPSessions; };
};
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}
}
#endif