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transit tunnel

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orignal 2013-11-10 18:19:49 -05:00
parent 18ec2e9ce8
commit 84301daeb8
7 changed files with 561 additions and 0 deletions
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TransitTunnel.cpp Normal file
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#include <string.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 uint8_t * nextIdent, uint32_t nextTunnelID,
const uint8_t * layerKey,const uint8_t * ivKey,
bool isGateway, bool isEndpoint)
{
memcpy (m_LayerKey, layerKey, 32);
memcpy (m_IVKey, ivKey, 32);
memcpy (m_NextIdent, nextIdent, 32);
m_IsGateway = isGateway;
m_IsEndpoint = isEndpoint;
m_TunnelID = receiveTunnelID;
m_NextTunnelID = nextTunnelID;
if (m_IsEndpoint)
LogPrint ("TransitTunnel endpoint: ", m_TunnelID, " created");
else if (m_IsGateway)
LogPrint ("TransitTunnel gateway: ", m_TunnelID, " created");
else
LogPrint ("TransitTunnel: ",m_TunnelID,"->", m_NextTunnelID, " created");
}
void TransitTunnel::Encrypt (uint8_t * payload)
{
m_ECBEncryption.SetKey (m_IVKey, 32);
m_ECBEncryption.ProcessData(payload, payload, 16); // iv
m_CBCEncryption.SetKeyWithIV (m_LayerKey, 32, payload);
m_CBCEncryption.ProcessData(payload + 16, payload + 16, 1008); // payload
m_ECBEncryption.SetKey (m_IVKey, 32);
m_ECBEncryption.ProcessData(payload, payload, 16); // double iv encryption
}
void TransitTunnel::HandleTunnelDataMsg (i2p::I2NPMessage * tunnelMsg)
{
Encrypt (tunnelMsg->GetPayload () + 4);
if (m_IsEndpoint)
{
LogPrint ("TransitTunnel endpoint for ", m_TunnelID);
m_Endpoint.HandleDecryptedTunnelDataMsg (tunnelMsg);
}
else
{
LogPrint ("TransitTunnel: ",m_TunnelID,"->", m_NextTunnelID);
*(uint32_t *)(tunnelMsg->GetPayload ()) = htobe32 (m_NextTunnelID);
FillI2NPMessageHeader (tunnelMsg, eI2NPTunnelData);
i2p::transports.SendMessage (m_NextIdent, tunnelMsg);
}
}
void TransitTunnel::SendTunnelDataMsg (const uint8_t * gwHash, uint32_t gwTunnel, i2p::I2NPMessage * msg)
{
if (m_IsGateway)
{
m_Gateway.PutI2NPMsg (gwHash, gwTunnel, msg);
auto tunnelMsgs = m_Gateway.GetTunnelDataMsgs (m_NextTunnelID);
for (auto tunnelMsg : tunnelMsgs)
{
Encrypt (tunnelMsg->GetPayload () + 4);
FillI2NPMessageHeader (tunnelMsg, eI2NPTunnelData);
i2p::transports.SendMessage (m_NextIdent, tunnelMsg);
}
}
else
{
LogPrint ("We are not a gateway for transit tunnel ", m_TunnelID);
i2p::DeleteI2NPMessage (msg);
}
}
}
}