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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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92 lines
2.9 KiB
92 lines
2.9 KiB
#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 uint8_t * nextIdent, uint32_t nextTunnelID, |
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const uint8_t * layerKey,const uint8_t * ivKey): |
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m_TunnelID (receiveTunnelID), m_NextTunnelID (nextTunnelID), |
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m_NextIdent (nextIdent), m_NumTransmittedBytes (0) |
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{ |
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m_ECBEncryption.SetKey (ivKey); |
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m_CBCEncryption.SetKey (layerKey); |
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} |
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void TransitTunnel::EncryptTunnelMsg (I2NPMessage * tunnelMsg) |
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{ |
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uint8_t * payload = tunnelMsg->GetPayload () + 4; |
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m_ECBEncryption.Encrypt ((i2p::crypto::ChipherBlock *)payload, (i2p::crypto::ChipherBlock *)payload); // iv |
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m_CBCEncryption.SetIV (payload); |
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m_CBCEncryption.Encrypt (payload + 16, TUNNEL_DATA_ENCRYPTED_SIZE, payload + 16); // payload |
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m_ECBEncryption.Encrypt((i2p::crypto::ChipherBlock *)payload, (i2p::crypto::ChipherBlock *)payload); // 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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EncryptTunnelMsg (tunnelMsg); |
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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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m_NumTransmittedBytes += tunnelMsg->GetLength (); |
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} |
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void TransitTunnel::SendTunnelDataMsg (i2p::I2NPMessage * msg) |
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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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void TransitTunnelGateway::SendTunnelDataMsg (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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m_Gateway.SendTunnelDataMsg (block); |
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} |
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void TransitTunnelEndpoint::HandleTunnelDataMsg (i2p::I2NPMessage * tunnelMsg) |
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{ |
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EncryptTunnelMsg (tunnelMsg); |
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LogPrint ("TransitTunnel endpoint for ", GetTunnelID ()); |
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m_Endpoint.HandleDecryptedTunnelDataMsg (tunnelMsg); |
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} |
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TransitTunnel * CreateTransitTunnel (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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if (isEndpoint) |
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{ |
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LogPrint ("TransitTunnel endpoint: ", receiveTunnelID, " created"); |
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return new 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 ("TransitTunnel gateway: ", receiveTunnelID, " created"); |
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return new TransitTunnelGateway (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey); |
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} |
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else |
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{ |
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LogPrint ("TransitTunnel: ", receiveTunnelID, "->", nextTunnelID, " created"); |
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return new TransitTunnel (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey); |
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} |
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} |
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} |
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} |