I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2024, 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
*/
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#ifndef I2CP_H__
#define I2CP_H__
#include <inttypes.h>
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#include <string>
#include <memory>
#include <mutex>
#include <thread>
#include <map>
#include <unordered_map>
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#include <boost/asio.hpp>
#include "util.h"
#include "Destination.h"
#include "Streaming.h"
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namespace i2p
{
namespace client
{
const uint8_t I2CP_PROTOCOL_BYTE = 0x2A;
const size_t I2CP_SESSION_BUFFER_SIZE = 4096;
const size_t I2CP_MAX_MESSAGE_LENGTH = 65535;
const size_t I2CP_MAX_SEND_QUEUE_SIZE = 1024*1024; // in bytes, 1M
const int I2CP_LEASESET_CREATION_TIMEOUT = 10; // in seconds
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_RECONFIGURE_SESSION_MESSAGE = 2;
const uint8_t I2CP_SESSION_STATUS_MESSAGE = 20;
const uint8_t I2CP_DESTROY_SESSION_MESSAGE = 3;
const uint8_t I2CP_REQUEST_VARIABLE_LEASESET_MESSAGE = 37;
const uint8_t I2CP_CREATE_LEASESET_MESSAGE = 4;
const uint8_t I2CP_CREATE_LEASESET2_MESSAGE = 41;
const uint8_t I2CP_SEND_MESSAGE_MESSAGE = 5;
const uint8_t I2CP_SEND_MESSAGE_EXPIRES_MESSAGE = 36;
const uint8_t I2CP_MESSAGE_PAYLOAD_MESSAGE = 31;
const uint8_t I2CP_MESSAGE_STATUS_MESSAGE = 22;
const uint8_t I2CP_HOST_LOOKUP_MESSAGE = 38;
const uint8_t I2CP_HOST_REPLY_MESSAGE = 39;
const uint8_t I2CP_DEST_LOOKUP_MESSAGE = 34;
const uint8_t I2CP_DEST_REPLY_MESSAGE = 35;
const uint8_t I2CP_GET_BANDWIDTH_LIMITS_MESSAGE = 8;
const uint8_t I2CP_BANDWIDTH_LIMITS_MESSAGE = 23;
enum I2CPMessageStatus
{
eI2CPMessageStatusAccepted = 1,
eI2CPMessageStatusGuaranteedSuccess = 4,
eI2CPMessageStatusGuaranteedFailure = 5,
eI2CPMessageStatusNoLocalTunnels = 16,
eI2CPMessageStatusNoLeaseSet = 21
};
enum I2CPSessionStatus
{
eI2CPSessionStatusDestroyed = 0,
eI2CPSessionStatusCreated = 1,
eI2CPSessionStatusUpdated = 2,
eI2CPSessionStatusInvalid = 3,
eI2CPSessionStatusRefused = 4
};
// params
const char I2CP_PARAM_MESSAGE_RELIABILITY[] = "i2cp.messageReliability";
class I2CPSession;
class I2CPDestination: public LeaseSetDestination
{
public:
I2CPDestination (boost::asio::io_context& service, std::shared_ptr<I2CPSession> owner,
std::shared_ptr<const i2p::data::IdentityEx> identity, bool isPublic, bool isSameThread,
const std::map<std::string, std::string>& params);
~I2CPDestination () {};
void Stop ();
void SetEncryptionPrivateKey (const uint8_t * key);
void SetEncryptionType (i2p::data::CryptoKeyType keyType) { m_EncryptionKeyType = keyType; };
void SetECIESx25519EncryptionPrivateKey (const uint8_t * key);
void LeaseSetCreated (const uint8_t * buf, size_t len); // called from I2CPSession
void LeaseSet2Created (uint8_t storeType, const uint8_t * buf, size_t len); // called from I2CPSession
void SendMsgTo (const uint8_t * payload, size_t len, const i2p::data::IdentHash& ident, uint32_t nonce); // called from I2CPSession
bool SendMsg (const uint8_t * payload, size_t len, std::shared_ptr<i2p::garlic::GarlicRoutingSession> remoteSession, uint32_t nonce);
// implements LocalDestination
bool Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const;
bool SupportsEncryptionType (i2p::data::CryptoKeyType keyType) const;
const uint8_t * GetEncryptionPublicKey (i2p::data::CryptoKeyType keyType) const; // for 4 only
std::shared_ptr<const i2p::data::IdentityEx> GetIdentity () const { return m_Identity; };
protected:
void CleanupDestination ();
// I2CP
void HandleDataMessage (const uint8_t * buf, size_t len);
void CreateNewLeaseSet (const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels);
private:
std::shared_ptr<I2CPDestination> GetSharedFromThis ()
{ return std::static_pointer_cast<I2CPDestination>(shared_from_this ()); }
bool SendMsg (std::shared_ptr<I2NPMessage> msg, std::shared_ptr<const i2p::data::LeaseSet> remote);
bool SendMsg (std::shared_ptr<I2NPMessage> garlic,
std::shared_ptr<i2p::tunnel::OutboundTunnel> outboundTunnel, std::shared_ptr<const i2p::data::Lease> remoteLease);
void PostCreateNewLeaseSet (std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels);
private:
std::shared_ptr<I2CPSession> m_Owner;
std::shared_ptr<const i2p::data::IdentityEx> m_Identity;
i2p::data::CryptoKeyType m_EncryptionKeyType;
std::shared_ptr<i2p::crypto::CryptoKeyDecryptor> m_Decryptor; // standard
std::shared_ptr<i2p::crypto::ECIESX25519AEADRatchetDecryptor> m_ECIESx25519Decryptor;
uint8_t m_ECIESx25519PrivateKey[32];
uint64_t m_LeaseSetExpirationTime;
bool m_IsCreatingLeaseSet, m_IsSameThread;
boost::asio::deadline_timer m_LeaseSetCreationTimer;
i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_MAX_MESSAGE_SIZE> > m_I2NPMsgsPool;
};
class RunnableI2CPDestination: private i2p::util::RunnableService, public I2CPDestination
{
public:
RunnableI2CPDestination (std::shared_ptr<I2CPSession> owner, std::shared_ptr<const i2p::data::IdentityEx> identity,
bool isPublic, const std::map<std::string, std::string>& params);
~RunnableI2CPDestination ();
void Start ();
void Stop ();
};
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 ();
void Start ();
void Stop ();
uint16_t GetSessionID () const { return m_SessionID; };
std::shared_ptr<const I2CPDestination> GetDestination () const { return m_Destination; };
// called from I2CPDestination
void SendI2CPMessage (uint8_t type, const uint8_t * payload, size_t len);
void SendMessagePayloadMessage (const uint8_t * payload, size_t len);
void SendMessageStatusMessage (uint32_t nonce, I2CPMessageStatus status);
void AddRoutingSession (const i2p::data::IdentHash& signingKey, std::shared_ptr<i2p::garlic::GarlicRoutingSession> remoteSession);
void CleanupRoutingSessions ();
// message handlers
void GetDateMessageHandler (const uint8_t * buf, size_t len);
void CreateSessionMessageHandler (const uint8_t * buf, size_t len);
void DestroySessionMessageHandler (const uint8_t * buf, size_t len);
void ReconfigureSessionMessageHandler (const uint8_t * buf, size_t len);
void CreateLeaseSetMessageHandler (const uint8_t * buf, size_t len);
void CreateLeaseSet2MessageHandler (const uint8_t * buf, size_t len);
void SendMessageMessageHandler (const uint8_t * buf, size_t len);
void SendMessageExpiresMessageHandler (const uint8_t * buf, size_t len);
void HostLookupMessageHandler (const uint8_t * buf, size_t len);
void DestLookupMessageHandler (const uint8_t * buf, size_t len);
void GetBandwidthLimitsMessageHandler (const uint8_t * buf, size_t len);
private:
void ReadProtocolByte ();
void ReceiveHeader ();
void HandleReceivedHeader (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void ReceivePayload ();
void HandleReceivedPayload (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleMessage ();
void Terminate ();
void HandleI2CPMessageSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
std::string ExtractString (const uint8_t * buf, size_t len);
size_t PutString (uint8_t * buf, size_t len, const std::string& str);
void ExtractMapping (const uint8_t * buf, size_t len, std::map<std::string, std::string>& mapping);
void SendSessionStatusMessage (I2CPSessionStatus status);
void SendHostReplyMessage (uint32_t requestID, std::shared_ptr<const i2p::data::IdentityEx> identity);
private:
I2CPServer& m_Owner;
std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
uint8_t m_Header[I2CP_HEADER_SIZE], m_Payload[I2CP_MAX_MESSAGE_LENGTH];
size_t m_PayloadLen;
std::shared_ptr<I2CPDestination> m_Destination;
std::mutex m_RoutingSessionsMutex;
std::unordered_map<i2p::data::IdentHash, std::shared_ptr<i2p::garlic::GarlicRoutingSession> > m_RoutingSessions; // signing key->session
uint16_t m_SessionID;
uint32_t m_MessageID;
bool m_IsSendAccepted;
// to client
bool m_IsSending;
uint8_t m_SendBuffer[I2CP_MAX_MESSAGE_LENGTH];
i2p::stream::SendBufferQueue m_SendQueue;
};
typedef void (I2CPSession::*I2CPMessageHandler)(const uint8_t * buf, size_t len);
class I2CPServer: private i2p::util::RunnableService
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{
public:
I2CPServer (const std::string& interface, uint16_t port, bool isSingleThread);
~I2CPServer ();
void Start ();
void Stop ();
auto& GetService () { return GetIOService (); };
bool IsSingleThread () const { return m_IsSingleThread; };
bool InsertSession (std::shared_ptr<I2CPSession> session);
void RemoveSession (uint16_t sessionID);
std::shared_ptr<I2CPSession> FindSessionByIdentHash (const i2p::data::IdentHash& ident) const;
private:
void Accept ();
void HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<boost::asio::ip::tcp::socket> socket);
private:
bool m_IsSingleThread;
I2CPMessageHandler m_MessagesHandlers[256];
std::map<uint16_t, std::shared_ptr<I2CPSession> > m_Sessions;
boost::asio::ip::tcp::acceptor m_Acceptor;
public:
const decltype(m_MessagesHandlers)& GetMessagesHandlers () const { return m_MessagesHandlers; };
// for HTTP
const decltype(m_Sessions)& GetSessions () const { return m_Sessions; };
};
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}
}
#endif