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252 lines
8.9 KiB
C++
252 lines
8.9 KiB
C++
/*
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* Copyright (c) 2013-2023, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#ifndef I2CP_H__
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#define I2CP_H__
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#include <inttypes.h>
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#include <string>
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#include <memory>
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#include <thread>
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#include <map>
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#include <boost/asio.hpp>
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#include "util.h"
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#include "Destination.h"
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#include "Streaming.h"
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namespace i2p
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{
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namespace client
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{
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const uint8_t I2CP_PROTOCOL_BYTE = 0x2A;
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const size_t I2CP_SESSION_BUFFER_SIZE = 4096;
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const size_t I2CP_MAX_MESSAGE_LENGTH = 65535;
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const size_t I2CP_MAX_SEND_QUEUE_SIZE = 1024*1024; // in bytes, 1M
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const int I2CP_LEASESET_CREATION_TIMEOUT = 10; // in seconds
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const size_t I2CP_HEADER_LENGTH_OFFSET = 0;
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const size_t I2CP_HEADER_TYPE_OFFSET = I2CP_HEADER_LENGTH_OFFSET + 4;
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const size_t I2CP_HEADER_SIZE = I2CP_HEADER_TYPE_OFFSET + 1;
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const uint8_t I2CP_GET_DATE_MESSAGE = 32;
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const uint8_t I2CP_SET_DATE_MESSAGE = 33;
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const uint8_t I2CP_CREATE_SESSION_MESSAGE = 1;
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const uint8_t I2CP_RECONFIGURE_SESSION_MESSAGE = 2;
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const uint8_t I2CP_SESSION_STATUS_MESSAGE = 20;
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const uint8_t I2CP_DESTROY_SESSION_MESSAGE = 3;
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const uint8_t I2CP_REQUEST_VARIABLE_LEASESET_MESSAGE = 37;
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const uint8_t I2CP_CREATE_LEASESET_MESSAGE = 4;
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const uint8_t I2CP_CREATE_LEASESET2_MESSAGE = 41;
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const uint8_t I2CP_SEND_MESSAGE_MESSAGE = 5;
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const uint8_t I2CP_SEND_MESSAGE_EXPIRES_MESSAGE = 36;
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const uint8_t I2CP_MESSAGE_PAYLOAD_MESSAGE = 31;
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const uint8_t I2CP_MESSAGE_STATUS_MESSAGE = 22;
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const uint8_t I2CP_HOST_LOOKUP_MESSAGE = 38;
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const uint8_t I2CP_HOST_REPLY_MESSAGE = 39;
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const uint8_t I2CP_DEST_LOOKUP_MESSAGE = 34;
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const uint8_t I2CP_DEST_REPLY_MESSAGE = 35;
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const uint8_t I2CP_GET_BANDWIDTH_LIMITS_MESSAGE = 8;
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const uint8_t I2CP_BANDWIDTH_LIMITS_MESSAGE = 23;
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enum I2CPMessageStatus
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{
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eI2CPMessageStatusAccepted = 1,
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eI2CPMessageStatusGuaranteedSuccess = 4,
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eI2CPMessageStatusGuaranteedFailure = 5,
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eI2CPMessageStatusNoLeaseSet = 21
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};
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enum I2CPSessionStatus
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{
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eI2CPSessionStatusDestroyed = 0,
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eI2CPSessionStatusCreated = 1,
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eI2CPSessionStatusUpdated = 2,
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eI2CPSessionStatusInvalid = 3,
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eI2CPSessionStatusRefused = 4
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};
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// params
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const char I2CP_PARAM_MESSAGE_RELIABILITY[] = "i2cp.messageReliability";
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class I2CPSession;
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class I2CPDestination: public LeaseSetDestination
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{
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public:
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I2CPDestination (boost::asio::io_service& service, std::shared_ptr<I2CPSession> owner,
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std::shared_ptr<const i2p::data::IdentityEx> identity, bool isPublic, const std::map<std::string, std::string>& params);
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~I2CPDestination () {};
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void Stop ();
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void SetEncryptionPrivateKey (const uint8_t * key);
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void SetEncryptionType (i2p::data::CryptoKeyType keyType) { m_EncryptionKeyType = keyType; };
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void SetECIESx25519EncryptionPrivateKey (const uint8_t * key);
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void LeaseSetCreated (const uint8_t * buf, size_t len); // called from I2CPSession
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void LeaseSet2Created (uint8_t storeType, const uint8_t * buf, size_t len); // called from I2CPSession
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void SendMsgTo (const uint8_t * payload, size_t len, const i2p::data::IdentHash& ident, uint32_t nonce); // called from I2CPSession
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// implements LocalDestination
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bool Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const;
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bool SupportsEncryptionType (i2p::data::CryptoKeyType keyType) const;
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const uint8_t * GetEncryptionPublicKey (i2p::data::CryptoKeyType keyType) const; // for 4 only
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std::shared_ptr<const i2p::data::IdentityEx> GetIdentity () const { return m_Identity; };
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protected:
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// I2CP
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void HandleDataMessage (const uint8_t * buf, size_t len);
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void CreateNewLeaseSet (const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels);
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private:
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std::shared_ptr<I2CPDestination> GetSharedFromThis ()
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{ return std::static_pointer_cast<I2CPDestination>(shared_from_this ()); }
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bool SendMsg (std::shared_ptr<I2NPMessage> msg, std::shared_ptr<const i2p::data::LeaseSet> remote);
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void PostCreateNewLeaseSet (std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels);
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private:
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std::shared_ptr<I2CPSession> m_Owner;
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std::shared_ptr<const i2p::data::IdentityEx> m_Identity;
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i2p::data::CryptoKeyType m_EncryptionKeyType;
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std::shared_ptr<i2p::crypto::CryptoKeyDecryptor> m_Decryptor; // standard
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std::shared_ptr<i2p::crypto::ECIESX25519AEADRatchetDecryptor> m_ECIESx25519Decryptor;
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uint8_t m_ECIESx25519PrivateKey[32];
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uint64_t m_LeaseSetExpirationTime;
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bool m_IsCreatingLeaseSet;
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boost::asio::deadline_timer m_LeaseSetCreationTimer;
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i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_MAX_MESSAGE_SIZE> > m_I2NPMsgsPool;
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};
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class RunnableI2CPDestination: private i2p::util::RunnableService, public I2CPDestination
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{
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public:
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RunnableI2CPDestination (std::shared_ptr<I2CPSession> owner, std::shared_ptr<const i2p::data::IdentityEx> identity,
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bool isPublic, const std::map<std::string, std::string>& params);
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~RunnableI2CPDestination ();
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void Start ();
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void Stop ();
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};
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class I2CPServer;
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class I2CPSession: public std::enable_shared_from_this<I2CPSession>
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{
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public:
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I2CPSession (I2CPServer& owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket);
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~I2CPSession ();
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void Start ();
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void Stop ();
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uint16_t GetSessionID () const { return m_SessionID; };
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std::shared_ptr<const I2CPDestination> GetDestination () const { return m_Destination; };
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// called from I2CPDestination
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void SendI2CPMessage (uint8_t type, const uint8_t * payload, size_t len);
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void SendMessagePayloadMessage (const uint8_t * payload, size_t len);
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void SendMessageStatusMessage (uint32_t nonce, I2CPMessageStatus status);
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// message handlers
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void GetDateMessageHandler (const uint8_t * buf, size_t len);
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void CreateSessionMessageHandler (const uint8_t * buf, size_t len);
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void DestroySessionMessageHandler (const uint8_t * buf, size_t len);
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void ReconfigureSessionMessageHandler (const uint8_t * buf, size_t len);
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void CreateLeaseSetMessageHandler (const uint8_t * buf, size_t len);
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void CreateLeaseSet2MessageHandler (const uint8_t * buf, size_t len);
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void SendMessageMessageHandler (const uint8_t * buf, size_t len);
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void SendMessageExpiresMessageHandler (const uint8_t * buf, size_t len);
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void HostLookupMessageHandler (const uint8_t * buf, size_t len);
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void DestLookupMessageHandler (const uint8_t * buf, size_t len);
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void GetBandwidthLimitsMessageHandler (const uint8_t * buf, size_t len);
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private:
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void ReadProtocolByte ();
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void ReceiveHeader ();
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void HandleReceivedHeader (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void ReceivePayload ();
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void HandleReceivedPayload (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleMessage ();
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void Terminate ();
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void HandleI2CPMessageSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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std::string ExtractString (const uint8_t * buf, size_t len);
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size_t PutString (uint8_t * buf, size_t len, const std::string& str);
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void ExtractMapping (const uint8_t * buf, size_t len, std::map<std::string, std::string>& mapping);
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void SendSessionStatusMessage (I2CPSessionStatus status);
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void SendHostReplyMessage (uint32_t requestID, std::shared_ptr<const i2p::data::IdentityEx> identity);
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private:
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I2CPServer& m_Owner;
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std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
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uint8_t m_Header[I2CP_HEADER_SIZE], m_Payload[I2CP_MAX_MESSAGE_LENGTH];
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size_t m_PayloadLen;
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std::shared_ptr<I2CPDestination> m_Destination;
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uint16_t m_SessionID;
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uint32_t m_MessageID;
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bool m_IsSendAccepted;
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// to client
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bool m_IsSending;
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uint8_t m_SendBuffer[I2CP_MAX_MESSAGE_LENGTH];
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i2p::stream::SendBufferQueue m_SendQueue;
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};
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typedef void (I2CPSession::*I2CPMessageHandler)(const uint8_t * buf, size_t len);
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class I2CPServer: private i2p::util::RunnableService
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{
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public:
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I2CPServer (const std::string& interface, uint16_t port, bool isSingleThread);
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~I2CPServer ();
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void Start ();
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void Stop ();
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boost::asio::io_service& GetService () { return GetIOService (); };
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bool IsSingleThread () const { return m_IsSingleThread; };
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bool InsertSession (std::shared_ptr<I2CPSession> session);
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void RemoveSession (uint16_t sessionID);
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std::shared_ptr<I2CPSession> FindSessionByIdentHash (const i2p::data::IdentHash& ident) const;
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private:
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void Run ();
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void Accept ();
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void HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<boost::asio::ip::tcp::socket> socket);
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private:
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bool m_IsSingleThread;
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I2CPMessageHandler m_MessagesHandlers[256];
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std::map<uint16_t, std::shared_ptr<I2CPSession> > m_Sessions;
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boost::asio::ip::tcp::acceptor m_Acceptor;
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public:
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const decltype(m_MessagesHandlers)& GetMessagesHandlers () const { return m_MessagesHandlers; };
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// for HTTP
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const decltype(m_Sessions)& GetSessions () const { return m_Sessions; };
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};
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}
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}
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#endif
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