mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-10 00:00:29 +03:00
117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
#ifndef SSU_H__
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#define SSU_H__
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#include <inttypes.h>
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#include <map>
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#include <boost/asio.hpp>
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#include <cryptopp/modes.h>
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#include <cryptopp/aes.h>
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#include "I2PEndian.h"
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#include "RouterInfo.h"
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#include "I2NPProtocol.h"
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namespace i2p
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{
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namespace ssu
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{
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#pragma pack(1)
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struct SSUHeader
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{
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uint8_t mac[16];
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uint8_t iv[16];
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uint8_t flag;
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uint32_t time;
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};
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#pragma pack()
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const int SSU_MTU = 1484;
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// payload types (3 bits)
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const uint8_t PAYLOAD_TYPE_SESSION_REQUEST = 0;
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const uint8_t PAYLOAD_TYPE_SESSION_CREATED = 1;
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const uint8_t PAYLOAD_TYPE_SESSION_CONFIRMED = 2;
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const uint8_t PAYLOAD_TYPE_RELAY_REQUEST = 3;
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const uint8_t PAYLOAD_TYPE_RELAY_RESPONSE = 4;
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const uint8_t PAYLOAD_TYPE_RELAY_INTRO = 5;
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const uint8_t PAYLOAD_TYPE_DATA = 6;
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const uint8_t PAYLOAD_TYPE_TEST = 7;
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enum SessionState
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{
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eSessionStateUnknown,
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eSessionStateRequestSent,
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eSessionStateRequestReceived,
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eSessionStateCreatedSent,
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eSessionStateCreatedReceived,
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eSessionStateConfirmedSent,
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eSessionStateConfirmedReceived,
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eSessionStateEstablised
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};
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class SSUServer;
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class SSUSession
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{
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public:
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SSUSession (SSUServer * server, const boost::asio::ip::udp::endpoint& remoteEndpoint,
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i2p::data::RouterInfo * router = nullptr);
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void ProcessNextMessage (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
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void Connect ();
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void SendI2NPMessage (I2NPMessage * msg);
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private:
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void CreateAESKey (uint8_t * pubKey, uint8_t * aesKey); // TODO: shouldn't be here
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void ProcessSessionRequest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
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void SendSessionRequest ();
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void ProcessSessionCreated (uint8_t * buf, size_t len);
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void SendSessionCreated (const boost::asio::ip::udp::endpoint& senderEndpoint);
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bool ProcessIntroKeyEncryptedMessage (uint8_t expectedPayloadType, uint8_t * buf, size_t len);
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void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len, uint8_t * aesKey, uint8_t * iv, uint8_t * macKey);
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void Decrypt (uint8_t * buf, size_t len, uint8_t * aesKey);
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bool Validate (uint8_t * buf, size_t len, uint8_t * macKey);
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private:
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SSUServer * m_Server;
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boost::asio::ip::udp::endpoint m_RemoteEndpoint;
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i2p::data::RouterInfo * m_RemoteRouter;
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SessionState m_State;
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CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption m_Encryption;
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CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption m_Decryption;
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uint8_t m_SessionKey[32];
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};
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class SSUServer
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{
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public:
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SSUServer (boost::asio::io_service& service, int port);
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~SSUServer ();
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void Start ();
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void Stop ();
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SSUSession * GetSession (i2p::data::RouterInfo * router);
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void Send (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& to);
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private:
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void Receive ();
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void HandleReceivedFrom (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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private:
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boost::asio::ip::udp::socket m_Socket;
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boost::asio::ip::udp::endpoint m_SenderEndpoint;
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uint8_t m_ReceiveBuffer[2*SSU_MTU];
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std::map<boost::asio::ip::udp::endpoint, SSUSession *> m_Sessions;
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};
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}
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}
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#endif
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