I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2022, 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
*/
#ifndef TRANSPORT_SESSION_H__
#define TRANSPORT_SESSION_H__
#include <inttypes.h>
#include <iostream>
#include <memory>
#include <vector>
#include <mutex>
#include "Identity.h"
#include "Crypto.h"
#include "RouterInfo.h"
#include "I2NPProtocol.h"
#include "Timestamp.h"
namespace i2p
{
namespace transport
{
const size_t IPV4_HEADER_SIZE = 20;
const size_t IPV6_HEADER_SIZE = 40;
const size_t UDP_HEADER_SIZE = 8;
class SignedData
{
public:
SignedData () {}
SignedData (const SignedData& other)
{
m_Stream << other.m_Stream.rdbuf ();
}
void Reset ()
{
m_Stream.str("");
}
void Insert (const uint8_t * buf, size_t len)
{
m_Stream.write ((char *)buf, len);
}
template<typename T>
void Insert (T t)
{
m_Stream.write ((char *)&t, sizeof (T));
}
bool Verify (std::shared_ptr<const i2p::data::IdentityEx> ident, const uint8_t * signature) const
{
return ident->Verify ((const uint8_t *)m_Stream.str ().c_str (), m_Stream.str ().size (), signature);
}
void Sign (const i2p::data::PrivateKeys& keys, uint8_t * signature) const
{
keys.Sign ((const uint8_t *)m_Stream.str ().c_str (), m_Stream.str ().size (), signature);
}
private:
std::stringstream m_Stream;
};
class TransportSession
{
public:
TransportSession (std::shared_ptr<const i2p::data::RouterInfo> router, int terminationTimeout):
m_NumSentBytes (0), m_NumReceivedBytes (0), m_IsOutgoing (router), m_TerminationTimeout (terminationTimeout),
m_LastActivityTimestamp (i2p::util::GetSecondsSinceEpoch ())
{
if (router)
m_RemoteIdentity = router->GetRouterIdentity ();
}
virtual ~TransportSession () {};
virtual void Done () = 0;
std::string GetIdentHashBase64() const { return m_RemoteIdentity ? m_RemoteIdentity->GetIdentHash().ToBase64() : ""; }
std::shared_ptr<const i2p::data::IdentityEx> GetRemoteIdentity ()
{
std::lock_guard<std::mutex> l(m_RemoteIdentityMutex);
return m_RemoteIdentity;
}
void SetRemoteIdentity (std::shared_ptr<const i2p::data::IdentityEx> ident)
{
std::lock_guard<std::mutex> l(m_RemoteIdentityMutex);
m_RemoteIdentity = ident;
}
size_t GetNumSentBytes () const { return m_NumSentBytes; };
size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
bool IsOutgoing () const { return m_IsOutgoing; };
int GetTerminationTimeout () const { return m_TerminationTimeout; };
void SetTerminationTimeout (int terminationTimeout) { m_TerminationTimeout = terminationTimeout; };
bool IsTerminationTimeoutExpired (uint64_t ts) const
{ return ts >= m_LastActivityTimestamp + GetTerminationTimeout (); };
virtual uint32_t GetRelayTag () const { return 0; };
virtual void SendLocalRouterInfo (bool update = false) { SendI2NPMessages ({ CreateDatabaseStoreMsg () }); };
virtual void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs) = 0;
protected:
std::shared_ptr<const i2p::data::IdentityEx> m_RemoteIdentity;
mutable std::mutex m_RemoteIdentityMutex;
size_t m_NumSentBytes, m_NumReceivedBytes;
bool m_IsOutgoing;
int m_TerminationTimeout;
uint64_t m_LastActivityTimestamp;
};
}
}
#endif