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85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
#include <string.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 uint8_t * nextIdent, uint32_t nextTunnelID,
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const uint8_t * layerKey,const uint8_t * ivKey,
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bool isGateway, bool isEndpoint)
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{
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memcpy (m_LayerKey, layerKey, 32);
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memcpy (m_IVKey, ivKey, 32);
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memcpy (m_NextIdent, nextIdent, 32);
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m_IsGateway = isGateway;
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m_IsEndpoint = isEndpoint;
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m_TunnelID = receiveTunnelID;
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m_NextTunnelID = nextTunnelID;
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if (m_IsEndpoint)
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LogPrint ("TransitTunnel endpoint: ", m_TunnelID, " created");
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else if (m_IsGateway)
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LogPrint ("TransitTunnel gateway: ", m_TunnelID, " created");
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else
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LogPrint ("TransitTunnel: ",m_TunnelID,"->", m_NextTunnelID, " created");
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}
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void TransitTunnel::Encrypt (uint8_t * payload)
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{
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m_ECBEncryption.SetKey (m_IVKey, 32);
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m_ECBEncryption.ProcessData(payload, payload, 16); // iv
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m_CBCEncryption.SetKeyWithIV (m_LayerKey, 32, payload);
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m_CBCEncryption.ProcessData(payload + 16, payload + 16, 1008); // payload
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m_ECBEncryption.SetKey (m_IVKey, 32);
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m_ECBEncryption.ProcessData(payload, payload, 16); // double iv encryption
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}
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void TransitTunnel::HandleTunnelDataMsg (i2p::I2NPMessage * tunnelMsg)
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{
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Encrypt (tunnelMsg->GetPayload () + 4);
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if (m_IsEndpoint)
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{
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LogPrint ("TransitTunnel endpoint for ", m_TunnelID);
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m_Endpoint.HandleDecryptedTunnelDataMsg (tunnelMsg);
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}
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else
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{
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LogPrint ("TransitTunnel: ",m_TunnelID,"->", m_NextTunnelID);
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*(uint32_t *)(tunnelMsg->GetPayload ()) = htobe32 (m_NextTunnelID);
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FillI2NPMessageHeader (tunnelMsg, eI2NPTunnelData);
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i2p::transports.SendMessage (m_NextIdent, tunnelMsg);
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}
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}
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void TransitTunnel::SendTunnelDataMsg (const uint8_t * gwHash, uint32_t gwTunnel, i2p::I2NPMessage * msg)
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{
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if (m_IsGateway)
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{
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m_Gateway.PutI2NPMsg (gwHash, gwTunnel, msg);
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auto tunnelMsgs = m_Gateway.GetTunnelDataMsgs (m_NextTunnelID);
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for (auto tunnelMsg : tunnelMsgs)
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{
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Encrypt (tunnelMsg->GetPayload () + 4);
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FillI2NPMessageHeader (tunnelMsg, eI2NPTunnelData);
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i2p::transports.SendMessage (m_NextIdent, tunnelMsg);
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}
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}
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else
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{
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LogPrint ("We are not a gateway for transit tunnel ", m_TunnelID);
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i2p::DeleteI2NPMessage (msg);
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}
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}
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}
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} |