mirror of
https://github.com/PurpleI2P/i2pd.git
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124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
/*
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* Copyright (c) 2013-2022, 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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#include <string.h>
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#include "I2PEndian.h"
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#include "Log.h"
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#include "RouterContext.h"
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#include "I2NPProtocol.h"
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#include "Tunnel.h"
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#include "Transports.h"
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#include "TransitTunnel.h"
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namespace i2p
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{
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namespace tunnel
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{
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TransitTunnel::TransitTunnel (uint32_t receiveTunnelID,
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const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
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const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey):
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TunnelBase (receiveTunnelID, nextTunnelID, nextIdent),
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m_LayerKey (layerKey), m_IVKey (ivKey)
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{
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}
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void TransitTunnel::EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out)
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{
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if (!m_Encryption)
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{
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m_Encryption.reset (new i2p::crypto::TunnelEncryption);
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m_Encryption->SetKeys (m_LayerKey, m_IVKey);
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}
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m_Encryption->Encrypt (in->GetPayload () + 4, out->GetPayload () + 4);
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i2p::transport::transports.UpdateTotalTransitTransmittedBytes (TUNNEL_DATA_MSG_SIZE);
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}
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TransitTunnelParticipant::~TransitTunnelParticipant ()
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{
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}
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void TransitTunnelParticipant::HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg)
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{
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EncryptTunnelMsg (tunnelMsg, tunnelMsg);
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m_NumTransmittedBytes += tunnelMsg->GetLength ();
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htobe32buf (tunnelMsg->GetPayload (), GetNextTunnelID ());
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tunnelMsg->FillI2NPMessageHeader (eI2NPTunnelData);
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m_TunnelDataMsgs.push_back (tunnelMsg);
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}
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void TransitTunnelParticipant::FlushTunnelDataMsgs ()
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{
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if (!m_TunnelDataMsgs.empty ())
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{
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auto num = m_TunnelDataMsgs.size ();
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if (num > 1)
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LogPrint (eLogDebug, "TransitTunnel: ", GetTunnelID (), "->", GetNextTunnelID (), " ", num);
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i2p::transport::transports.SendMessages (GetNextIdentHash (), m_TunnelDataMsgs);
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m_TunnelDataMsgs.clear ();
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}
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}
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void TransitTunnel::SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg)
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{
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LogPrint (eLogError, "TransitTunnel: We are not a gateway for ", GetTunnelID ());
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}
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void TransitTunnel::HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg)
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{
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LogPrint (eLogError, "TransitTunnel: Incoming tunnel message is not supported ", GetTunnelID ());
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}
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void TransitTunnelGateway::SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg)
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{
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TunnelMessageBlock block;
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block.deliveryType = eDeliveryTypeLocal;
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block.data = msg;
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std::unique_lock<std::mutex> l(m_SendMutex);
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m_Gateway.PutTunnelDataMsg (block);
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}
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void TransitTunnelGateway::FlushTunnelDataMsgs ()
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{
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std::unique_lock<std::mutex> l(m_SendMutex);
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m_Gateway.SendBuffer ();
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}
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void TransitTunnelEndpoint::HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg)
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{
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auto newMsg = CreateEmptyTunnelDataMsg (true);
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EncryptTunnelMsg (tunnelMsg, newMsg);
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LogPrint (eLogDebug, "TransitTunnel: handle msg for endpoint ", GetTunnelID ());
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m_Endpoint.HandleDecryptedTunnelDataMsg (newMsg);
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}
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std::shared_ptr<TransitTunnel> CreateTransitTunnel (uint32_t receiveTunnelID,
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const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
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const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey,
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bool isGateway, bool isEndpoint)
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{
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if (isEndpoint)
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{
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LogPrint (eLogDebug, "TransitTunnel: endpoint ", receiveTunnelID, " created");
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return std::make_shared<TransitTunnelEndpoint> (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
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}
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else if (isGateway)
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{
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LogPrint (eLogInfo, "TransitTunnel: gateway ", receiveTunnelID, " created");
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return std::make_shared<TransitTunnelGateway> (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
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}
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else
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{
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LogPrint (eLogDebug, "TransitTunnel: ", receiveTunnelID, "->", nextTunnelID, " created");
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return std::make_shared<TransitTunnelParticipant> (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
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}
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}
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}
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}
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