I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef SSU_H__
#define SSU_H__
#include <inttypes.h>
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#include <map>
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#include <boost/asio.hpp>
#include <cryptopp/modes.h>
#include <cryptopp/aes.h>
#include "I2PEndian.h"
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namespace i2p
{
namespace ssu
{
#pragma pack(1)
struct SSUHeader
{
uint8_t mac[16];
uint8_t iv[16];
uint8_t flag;
uint32_t time;
};
#pragma pack()
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const int SSU_MTU = 1484;
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// payload types (4 bits)
const uint8_t PAYLOAD_TYPE_SESSION_REQUEST = 0;
const uint8_t PAYLOAD_TYPE_SESSION_CREATED = 1;
const uint8_t PAYLOAD_TYPE_SESSION_CONFIRMED = 2;
const uint8_t PAYLOAD_TYPE_RELAY_REQUEST = 3;
const uint8_t PAYLOAD_TYPE_RELAY_RESPONSE = 4;
const uint8_t PAYLOAD_TYPE_RELAY_INTRO = 5;
const uint8_t PAYLOAD_TYPE_DATA = 6;
const uint8_t PAYLOAD_TYPE_TEST = 7;
enum SessionState
{
eSessionStateUnknown,
eSessionStateRequestSent,
eSessionStateRequestReceived,
eSessionStateCreatedSent,
eSessionStateCreatedReceived,
eSessionStateConfirmedSent,
eSessionStateConfirmedReceived,
eSessionStateEstablised
};
class SSUSession
{
public:
SSUSession ();
void ProcessNextMessage (uint8_t * buf, size_t len);
private:
void Authenticate (uint8_t * buf, size_t len, uint8_t * aesKey, uint8_t * iv, uint8_t * macKey);
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private:
SessionState m_State;
CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption m_Encryption;
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};
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class SSUServer
{
public:
SSUServer (boost::asio::io_service& service, int port);
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~SSUServer ();
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void Start ();
void Stop ();
private:
void Receive ();
void HandleReceivedFrom (const boost::system::error_code& ecode, std::size_t bytes_transferred);
private:
boost::asio::ip::udp::socket m_Socket;
boost::asio::ip::udp::endpoint m_SenderEndpoint;
uint8_t m_ReceiveBuffer[SSU_MTU];
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std::map<boost::asio::ip::udp::endpoint, SSUSession *> m_Sessions;
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};
}
}
#endif