i2pd/Garlic.h

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#ifndef GARLIC_H__
#define GARLIC_H__
#include <inttypes.h>
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#include <map>
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#include <list>
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#include <string>
#include <thread>
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#include <mutex>
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#include <cryptopp/osrng.h>
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#include "aes.h"
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#include "I2NPProtocol.h"
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#include "LeaseSet.h"
#include "Tunnel.h"
#include "Queue.h"
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namespace i2p
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{
namespace garlic
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{
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enum GarlicDeliveryType
{
eGarlicDeliveryTypeLocal = 0,
eGarlicDeliveryTypeDestination = 1,
eGarlicDeliveryTypeRouter = 2,
eGarlicDeliveryTypeTunnel = 3
};
#pragma pack(1)
struct ElGamalBlock
{
uint8_t sessionKey[32];
uint8_t preIV[32];
uint8_t padding[158];
};
#pragma pack()
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const int TAGS_EXPIRATION_TIMEOUT = 900; // 15 minutes
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typedef i2p::data::Tag<32> SessionTag;
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class GarlicRoutingSession
{
public:
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GarlicRoutingSession (const i2p::data::RoutingDestination * destination, int numTags);
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GarlicRoutingSession (const uint8_t * sessionKey, const SessionTag& sessionTag); // one time encryption
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~GarlicRoutingSession ();
I2NPMessage * WrapSingleMessage (I2NPMessage * msg, const i2p::data::LeaseSet * leaseSet);
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int GetNextTag () const { return m_NextTag; };
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bool IsAcknowledged () const { return m_IsAcknowledged; };
void SetAcknowledged (bool acknowledged) { m_IsAcknowledged = acknowledged; };
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private:
size_t CreateAESBlock (uint8_t * buf, const I2NPMessage * msg, bool attachLeaseSet);
size_t CreateGarlicPayload (uint8_t * payload, const I2NPMessage * msg, bool attachLeaseSet);
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size_t CreateGarlicClove (uint8_t * buf, const I2NPMessage * msg, bool isDestination);
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size_t CreateDeliveryStatusClove (uint8_t * buf, uint32_t msgID);
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void GenerateSessionTags ();
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private:
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const i2p::data::RoutingDestination * m_Destination;
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uint8_t m_SessionKey[32];
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bool m_IsAcknowledged;
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int m_NumTags, m_NextTag;
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SessionTag * m_SessionTags; // m_NumTags*32 bytes
uint32_t m_TagsCreationTime; // seconds since epoch
const i2p::data::LeaseSet * m_LocalLeaseSet;
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i2p::crypto::CBCEncryption m_Encryption;
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CryptoPP::AutoSeededRandomPool m_Rnd;
};
class GarlicRouting
{
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class SessionDecryption: public i2p::crypto::CBCDecryption
{
public:
SessionDecryption (): m_TagCount (0) {};
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void SetTagCount (int tagCount) { m_TagCount = tagCount; };
void AddTagCount (int tagCount) { m_TagCount += tagCount; };
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int GetTagCount () const { return m_TagCount; };
bool UseTag () { m_TagCount--; return m_TagCount > 0; };
private:
int m_TagCount;
};
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public:
GarlicRouting ();
~GarlicRouting ();
void Start ();
void Stop ();
void PostI2NPMsg (I2NPMessage * msg);
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void AddSessionKey (const uint8_t * key, const uint8_t * tag); // one tag
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GarlicRoutingSession * GetRoutingSession (const i2p::data::RoutingDestination& destination, int numTags);
I2NPMessage * WrapSingleMessage (const i2p::data::RoutingDestination& destination, I2NPMessage * msg);
I2NPMessage * WrapMessage (const i2p::data::RoutingDestination& destination,
I2NPMessage * msg, const i2p::data::LeaseSet * leaseSet = nullptr);
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void DeliveryStatusSent (GarlicRoutingSession * session, uint32_t msgID);
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private:
void Run ();
void HandleGarlicMessage (I2NPMessage * msg);
void HandleDeliveryStatusMessage (I2NPMessage * msg);
void HandleAESBlock (uint8_t * buf, size_t len, SessionDecryption * decryption, i2p::tunnel::InboundTunnel * from);
void HandleGarlicPayload (uint8_t * buf, size_t len, i2p::tunnel::InboundTunnel * from);
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private:
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bool m_IsRunning;
std::thread * m_Thread;
i2p::util::Queue<I2NPMessage> m_Queue;
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// outgoing sessions
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std::mutex m_SessionsMutex;
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std::map<i2p::data::IdentHash, GarlicRoutingSession *> m_Sessions;
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std::mutex m_CreatedSessionsMutex;
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std::map<uint32_t, GarlicRoutingSession *> m_CreatedSessions; // msgID -> session
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// incoming session
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// multiple tags refer to one decyption
std::map<SessionTag, SessionDecryption *> m_SessionTags; // tag -> decryption
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};
extern GarlicRouting routing;
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}
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}
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#endif