i2pd/libi2pd/TransitTunnel.cpp
R4SAS 503f522cc3
[style] clean trailing spaces and tabs
Signed-off-by: R4SAS <r4sas@i2pmail.org>
2023-01-03 21:25:19 +03:00

124 lines
3.8 KiB
C++

/*
* 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
*/
#include <string.h>
#include "I2PEndian.h"
#include "Log.h"
#include "RouterContext.h"
#include "I2NPProtocol.h"
#include "Tunnel.h"
#include "Transports.h"
#include "TransitTunnel.h"
namespace i2p
{
namespace tunnel
{
TransitTunnel::TransitTunnel (uint32_t receiveTunnelID,
const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey):
TunnelBase (receiveTunnelID, nextTunnelID, nextIdent),
m_LayerKey (layerKey), m_IVKey (ivKey)
{
}
void TransitTunnel::EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out)
{
if (!m_Encryption)
{
m_Encryption.reset (new i2p::crypto::TunnelEncryption);
m_Encryption->SetKeys (m_LayerKey, m_IVKey);
}
m_Encryption->Encrypt (in->GetPayload () + 4, out->GetPayload () + 4);
i2p::transport::transports.UpdateTotalTransitTransmittedBytes (TUNNEL_DATA_MSG_SIZE);
}
TransitTunnelParticipant::~TransitTunnelParticipant ()
{
}
void TransitTunnelParticipant::HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg)
{
EncryptTunnelMsg (tunnelMsg, tunnelMsg);
m_NumTransmittedBytes += tunnelMsg->GetLength ();
htobe32buf (tunnelMsg->GetPayload (), GetNextTunnelID ());
tunnelMsg->FillI2NPMessageHeader (eI2NPTunnelData);
m_TunnelDataMsgs.push_back (tunnelMsg);
}
void TransitTunnelParticipant::FlushTunnelDataMsgs ()
{
if (!m_TunnelDataMsgs.empty ())
{
auto num = m_TunnelDataMsgs.size ();
if (num > 1)
LogPrint (eLogDebug, "TransitTunnel: ", GetTunnelID (), "->", GetNextTunnelID (), " ", num);
i2p::transport::transports.SendMessages (GetNextIdentHash (), m_TunnelDataMsgs);
m_TunnelDataMsgs.clear ();
}
}
void TransitTunnel::SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg)
{
LogPrint (eLogError, "TransitTunnel: We are not a gateway for ", GetTunnelID ());
}
void TransitTunnel::HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg)
{
LogPrint (eLogError, "TransitTunnel: Incoming tunnel message is not supported ", GetTunnelID ());
}
void TransitTunnelGateway::SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg)
{
TunnelMessageBlock block;
block.deliveryType = eDeliveryTypeLocal;
block.data = msg;
std::unique_lock<std::mutex> l(m_SendMutex);
m_Gateway.PutTunnelDataMsg (block);
}
void TransitTunnelGateway::FlushTunnelDataMsgs ()
{
std::unique_lock<std::mutex> l(m_SendMutex);
m_Gateway.SendBuffer ();
}
void TransitTunnelEndpoint::HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg)
{
auto newMsg = CreateEmptyTunnelDataMsg (true);
EncryptTunnelMsg (tunnelMsg, newMsg);
LogPrint (eLogDebug, "TransitTunnel: handle msg for endpoint ", GetTunnelID ());
m_Endpoint.HandleDecryptedTunnelDataMsg (newMsg);
}
std::shared_ptr<TransitTunnel> CreateTransitTunnel (uint32_t receiveTunnelID,
const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey,
bool isGateway, bool isEndpoint)
{
if (isEndpoint)
{
LogPrint (eLogDebug, "TransitTunnel: endpoint ", receiveTunnelID, " created");
return std::make_shared<TransitTunnelEndpoint> (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
}
else if (isGateway)
{
LogPrint (eLogInfo, "TransitTunnel: gateway ", receiveTunnelID, " created");
return std::make_shared<TransitTunnelGateway> (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
}
else
{
LogPrint (eLogDebug, "TransitTunnel: ", receiveTunnelID, "->", nextTunnelID, " created");
return std::make_shared<TransitTunnelParticipant> (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
}
}
}
}