I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <string.h>
#include "I2PEndian.h"
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#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):
m_TunnelID (receiveTunnelID), m_NextTunnelID (nextTunnelID),
m_NextIdent (nextIdent)
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{
m_Encryption.SetKeys (layerKey, ivKey);
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}
void TransitTunnel::EncryptTunnelMsg (I2NPMessage * tunnelMsg)
{
m_Encryption.Encrypt (tunnelMsg->GetPayload () + 4);
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}
TransitTunnelParticipant::~TransitTunnelParticipant ()
{
for (auto it: m_TunnelDataMsgs)
i2p::DeleteI2NPMessage (it);
}
void TransitTunnelParticipant::HandleTunnelDataMsg (i2p::I2NPMessage * tunnelMsg)
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{
EncryptTunnelMsg (tunnelMsg);
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LogPrint (eLogDebug, "TransitTunnel: ",GetTunnelID (),"->", GetNextTunnelID ());
m_NumTransmittedBytes += tunnelMsg->GetLength ();
htobe32buf (tunnelMsg->GetPayload (), GetNextTunnelID ());
FillI2NPMessageHeader (tunnelMsg, eI2NPTunnelData);
m_TunnelDataMsgs.push_back (tunnelMsg);
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}
void TransitTunnelParticipant::FlushTunnelDataMsgs ()
{
if (!m_TunnelDataMsgs.empty ())
{
i2p::transport::transports.SendMessages (GetNextIdentHash (), m_TunnelDataMsgs);
m_TunnelDataMsgs.clear ();
}
}
void TransitTunnel::SendTunnelDataMsg (i2p::I2NPMessage * msg)
{
LogPrint (eLogError, "We are not a gateway for transit tunnel ", m_TunnelID);
i2p::DeleteI2NPMessage (msg);
}
void TransitTunnel::HandleTunnelDataMsg (i2p::I2NPMessage * tunnelMsg)
{
LogPrint (eLogError, "Incoming tunnel message is not supported ", m_TunnelID);
DeleteI2NPMessage (tunnelMsg);
}
void TransitTunnelGateway::SendTunnelDataMsg (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 (i2p::I2NPMessage * tunnelMsg)
{
EncryptTunnelMsg (tunnelMsg);
LogPrint (eLogDebug, "TransitTunnel endpoint for ", GetTunnelID ());
m_Endpoint.HandleDecryptedTunnelDataMsg (tunnelMsg);
}
TransitTunnel * CreateTransitTunnel (uint32_t receiveTunnelID,
const uint8_t * nextIdent, uint32_t nextTunnelID,
const uint8_t * layerKey,const uint8_t * ivKey,
bool isGateway, bool isEndpoint)
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{
if (isEndpoint)
{
LogPrint (eLogInfo, "TransitTunnel endpoint: ", receiveTunnelID, " created");
return new TransitTunnelEndpoint (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
}
else if (isGateway)
{
LogPrint (eLogInfo, "TransitTunnel gateway: ", receiveTunnelID, " created");
return new TransitTunnelGateway (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
}
else
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{
LogPrint (eLogInfo, "TransitTunnel: ", receiveTunnelID, "->", nextTunnelID, " created");
return new TransitTunnelParticipant (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey);
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}
}
}
}