I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2016, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#ifndef I2CP_H__
#define I2CP_H__
#include <inttypes.h>
#include <string>
#include <memory>
#include <boost/asio.hpp>
#include "Destination.h"
namespace i2p
{
namespace client
{
const uint8_t I2CP_PRTOCOL_BYTE = 0x2A;
const size_t I2CP_SESSION_BUFFER_SIZE = 4096;
const size_t I2CP_HEADER_LENGTH_OFFSET = 0;
const size_t I2CP_HEADER_TYPE_OFFSET = I2CP_HEADER_LENGTH_OFFSET + 4;
const size_t I2CP_HEADER_SIZE = I2CP_HEADER_TYPE_OFFSET + 1;
const uint8_t I2CP_GET_DATE_MESSAGE = 32;
const uint8_t I2CP_SET_DATE_MESSAGE = 33;
const uint8_t I2CP_CREATE_SESSION_MESSAGE = 1;
const uint8_t I2CP_SESSION_STATUS_MESSAGE = 20;
const uint8_t I2CP_REQUEST_VARIABLE_LEASESET_MESSAGE = 37;
const uint8_t I2CP_CREATE_LEASESET_MESSAGE = 4;
const uint8_t I2CP_SEND_MESSAGE_MESSAGE = 5;
class I2CPSession;
class I2CPDestination: public LeaseSetDestination
{
public:
I2CPDestination (I2CPSession& owner, std::shared_ptr<const i2p::data::IdentityEx> identity, bool isPublic);
void SetEncryptionPrivateKey (const uint8_t * key);
void LeaseSetCreated (const uint8_t * buf, size_t len); // called from I2CPSession
void SendMsgTo (const uint8_t * payload, size_t len, const i2p::data::IdentHash& ident); // called from I2CPSession
protected:
// implements LocalDestination
const uint8_t * GetEncryptionPrivateKey () const { return m_EncryptionPrivateKey; };
std::shared_ptr<const i2p::data::IdentityEx> GetIdentity () const { return m_Identity; };
// I2CP
void HandleDataMessage (const uint8_t * buf, size_t len) { /* TODO */ };
void CreateNewLeaseSet (std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels);
private:
I2CPSession& m_Owner;
std::shared_ptr<const i2p::data::IdentityEx> m_Identity;
uint8_t m_EncryptionPrivateKey[256];
uint64_t m_LeaseSetExpirationTime;
};
class I2CPServer;
class I2CPSession: public std::enable_shared_from_this<I2CPSession>
{
public:
I2CPSession (I2CPServer& owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket);
~I2CPSession ();
uint16_t GetSessionID () const { return m_SessionID; };
void SendI2CPMessage (uint8_t type, const uint8_t * payload, size_t len);
// message handlers
void GetDateMessageHandler (const uint8_t * buf, size_t len);
void CreateSessionMessageHandler (const uint8_t * buf, size_t len);
void CreateLeaseSetMessageHandler (const uint8_t * buf, size_t len);
void SendMessageMessageHandler (const uint8_t * buf, size_t len);
private:
void ReadProtocolByte ();
void Receive ();
void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleNextMessage (const uint8_t * buf);
void Terminate ();
void HandleI2CPMessageSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, const uint8_t * buf);
std::string ExtractString (const uint8_t * buf, size_t len);
size_t PutString (uint8_t * buf, size_t len, const std::string& str);
void SendSessionStatusMessage (uint8_t status);
private:
I2CPServer& m_Owner;
std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
uint8_t m_Buffer[I2CP_SESSION_BUFFER_SIZE], * m_NextMessage;
size_t m_NextMessageLen, m_NextMessageOffset;
std::shared_ptr<I2CPDestination> m_Destination;
uint16_t m_SessionID;
};
typedef void (I2CPSession::*I2CPMessageHandler)(const uint8_t * buf, size_t len);
class I2CPServer
{
public:
I2CPServer (const std::string& interface, int port);
private:
I2CPMessageHandler m_MessagesHandlers[256];
public:
const decltype(m_MessagesHandlers)& GetMessagesHandlers () const { return m_MessagesHandlers; };
};
}
}
#endif