I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <string.h>
#include "I2PEndian.h"
#include <cryptopp/sha.h>
#include "Log.h"
#include "RouterContext.h"
#include "Transports.h"
#include "TunnelGateway.h"
namespace i2p
{
namespace tunnel
{
void TunnelGatewayBuffer::PutI2NPMsg (const TunnelMessageBlock& block)
{
bool messageCreated = false;
if (!m_CurrentTunnelDataMsg)
{
CreateCurrentTunnelDataMessage ();
messageCreated = true;
}
// create delivery instructions
uint8_t di[43]; // max delivery instruction length is 43 for tunnel
size_t diLen = 1;// flag
if (block.deliveryType != eDeliveryTypeLocal) // tunnel or router
{
if (block.deliveryType == eDeliveryTypeTunnel)
{
*(uint32_t *)(di + diLen) = htobe32 (block.tunnelID);
diLen += 4; // tunnelID
}
memcpy (di + diLen, block.hash, 32);
diLen += 32; //len
}
di[0] = block.deliveryType << 5; // set delivery type
// create fragments
I2NPMessage * msg = block.data;
auto fullMsgLen = diLen + msg->GetLength () + 2; // delivery instructions + payload + 2 bytes length
if (fullMsgLen <= m_RemainingSize)
{
// message fits. First and last fragment
*(uint16_t *)(di + diLen) = htobe16 (msg->GetLength ());
diLen += 2; // size
memcpy (m_CurrentTunnelDataMsg->buf + m_CurrentTunnelDataMsg->len, di, diLen);
memcpy (m_CurrentTunnelDataMsg->buf + m_CurrentTunnelDataMsg->len + diLen, msg->GetBuffer (), msg->GetLength ());
m_CurrentTunnelDataMsg->len += diLen + msg->GetLength ();
m_RemainingSize -= diLen + msg->GetLength ();
if (!m_RemainingSize)
CompleteCurrentTunnelDataMessage ();
DeleteI2NPMessage (msg);
}
else
{
if (!messageCreated) // check if we should complete previous message
{
auto numFollowOnFragments = fullMsgLen / TUNNEL_DATA_MAX_PAYLOAD_SIZE;
// length of bytes don't fit full tunnel message
// every follow-on fragment adds 7 bytes
auto nonFit = (fullMsgLen + numFollowOnFragments*7) % TUNNEL_DATA_MAX_PAYLOAD_SIZE;
if (!nonFit || nonFit > m_RemainingSize)
{
CompleteCurrentTunnelDataMessage ();
CreateCurrentTunnelDataMessage ();
}
}
if (diLen + 6 <= m_RemainingSize)
{
// delivery instructions fit
uint32_t msgID = msg->GetHeader ()->msgID; // in network bytes order
size_t size = m_RemainingSize - diLen - 6; // 6 = 4 (msgID) + 2 (size)
// first fragment
di[0] |= 0x08; // fragmented
*(uint32_t *)(di + diLen) = msgID;
diLen += 4; // Message ID
*(uint16_t *)(di + diLen) = htobe16 (size);
diLen += 2; // size
memcpy (m_CurrentTunnelDataMsg->buf + m_CurrentTunnelDataMsg->len, di, diLen);
memcpy (m_CurrentTunnelDataMsg->buf + m_CurrentTunnelDataMsg->len + diLen, msg->GetBuffer (), size);
m_CurrentTunnelDataMsg->len += diLen + size;
CompleteCurrentTunnelDataMessage ();
// follow on fragments
int fragmentNumber = 1;
while (size < msg->GetLength ())
{
CreateCurrentTunnelDataMessage ();
uint8_t * buf = m_CurrentTunnelDataMsg->GetBuffer ();
buf[0] = 0x80 | (fragmentNumber << 1); // frag
bool isLastFragment = false;
size_t s = msg->GetLength () - size;
if (s > TUNNEL_DATA_MAX_PAYLOAD_SIZE - 7) // 7 follow on instructions
s = TUNNEL_DATA_MAX_PAYLOAD_SIZE - 7;
else // last fragment
{
buf[0] |= 0x01;
isLastFragment = true;
}
*(uint32_t *)(buf + 1) = msgID; //Message ID
*(uint16_t *)(buf + 5) = htobe16 (s); // size
memcpy (buf + 7, msg->GetBuffer () + size, s);
m_CurrentTunnelDataMsg->len += s+7;
if (isLastFragment)
{
m_RemainingSize -= s+7;
if (!m_RemainingSize)
CompleteCurrentTunnelDataMessage ();
}
else
CompleteCurrentTunnelDataMessage ();
size += s;
fragmentNumber++;
}
DeleteI2NPMessage (msg);
}
else
{
// delivery instructions don't fit. Create new message
CompleteCurrentTunnelDataMessage ();
PutI2NPMsg (block);
// don't delete msg because it's taken care inside
}
}
}
void TunnelGatewayBuffer::ClearTunnelDataMsgs ()
{
m_TunnelDataMsgs.clear ();
}
void TunnelGatewayBuffer::CreateCurrentTunnelDataMessage ()
{
m_CurrentTunnelDataMsg = NewI2NPMessage ();
// we reserve space for padding
m_CurrentTunnelDataMsg->offset += TUNNEL_DATA_MSG_SIZE + sizeof (I2NPHeader);
m_CurrentTunnelDataMsg->len = m_CurrentTunnelDataMsg->offset;
m_RemainingSize = TUNNEL_DATA_MAX_PAYLOAD_SIZE;
}
void TunnelGatewayBuffer::CompleteCurrentTunnelDataMessage ()
{
if (!m_CurrentTunnelDataMsg) return;
uint8_t * payload = m_CurrentTunnelDataMsg->GetBuffer ();
size_t size = m_CurrentTunnelDataMsg->len - m_CurrentTunnelDataMsg->offset;
m_CurrentTunnelDataMsg->offset = m_CurrentTunnelDataMsg->len - TUNNEL_DATA_MSG_SIZE - sizeof (I2NPHeader);
uint8_t * buf = m_CurrentTunnelDataMsg->GetPayload ();
*(uint32_t *)(buf) = htobe32 (m_TunnelID);
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
rnd.GenerateBlock (buf + 4, 16); // original IV
memcpy (payload + size, buf + 4, 16); // copy IV for checksum
uint8_t hash[32];
CryptoPP::SHA256().CalculateDigest (hash, payload, size+16);
memcpy (buf+20, hash, 4); // checksum
payload[-1] = 0; // zero
ptrdiff_t paddingSize = payload - buf - 25; // 25 = 24 + 1
if (paddingSize > 0)
memset (buf + 24, 1, paddingSize); // padding TODO: fill with random data
// we can't fill message header yet because encryption is required
m_TunnelDataMsgs.push_back (m_CurrentTunnelDataMsg);
m_CurrentTunnelDataMsg = nullptr;
}
void TunnelGateway::SendTunnelDataMsg (const TunnelMessageBlock& block)
{
if (block.data)
{
PutTunnelDataMsg (block);
SendBuffer ();
}
}
void TunnelGateway::PutTunnelDataMsg (const TunnelMessageBlock& block)
{
if (block.data)
m_Buffer.PutI2NPMsg (block);
}
void TunnelGateway::SendBuffer ()
{
m_Buffer.CompleteCurrentTunnelDataMessage ();
auto tunnelMsgs = m_Buffer.GetTunnelDataMsgs ();
for (auto tunnelMsg : tunnelMsgs)
{
m_Tunnel->EncryptTunnelMsg (tunnelMsg);
FillI2NPMessageHeader (tunnelMsg, eI2NPTunnelData);
i2p::transport::transports.SendMessage (m_Tunnel->GetNextIdentHash (), tunnelMsg);
m_NumSentBytes += TUNNEL_DATA_MSG_SIZE;
}
m_Buffer.ClearTunnelDataMsgs ();
}
}
}