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HandleFollowOnFragment

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orignal 2014-07-04 20:54:03 -04:00
parent b19e6bb5ba
commit 49035ef55d
2 changed files with 52 additions and 53 deletions
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92
TunnelEndpoint.cpp
View File

@ -91,7 +91,6 @@ namespace tunnel
msg->offset = fragment - msg->buf;
msg->len = msg->offset + size;
bool isLastMessage = false;
if (fragment + size < decrypted + TUNNEL_DATA_ENCRYPTED_SIZE)
{
// this is not last message. we have to copy it
@ -101,10 +100,7 @@ namespace tunnel
*(m.data) = *msg;
}
else
{
m.data = msg;
isLastMessage = true;
}
if (!isFollowOnFragment && isLastFragment)
HandleNextMessage (m);
@ -119,49 +115,8 @@ namespace tunnel
}
else
{
auto it = m_IncompleteMessages.find (msgID);
if (it != m_IncompleteMessages.end())
{
if (fragmentNum == it->second.nextFragmentNum)
{
I2NPMessage * incompleteMessage = it->second.data;
if (incompleteMessage->len + size < I2NP_MAX_MESSAGE_SIZE) // check if messega is not too long
{
memcpy (incompleteMessage->buf + incompleteMessage->len, fragment, size); // concatenate fragment
incompleteMessage->len += size;
if (isLastFragment)
{
// message complete
HandleNextMessage (it->second);
m_IncompleteMessages.erase (it);
}
else
it->second.nextFragmentNum++;
}
else
{
LogPrint ("Fragment ", fragmentNum, " of message ", msgID, "exceeds max I2NP message size. Message dropped");
i2p::DeleteI2NPMessage (it->second.data);
m_IncompleteMessages.erase (it);
}
}
else
{
LogPrint ("Unexpected fragment ", fragmentNum, " instead ", it->second.nextFragmentNum, " of message ", msgID, ". Discarded");
i2p::DeleteI2NPMessage (it->second.data);
m_IncompleteMessages.erase (it); // TODO: store unexpected fragment for a while
}
}
else
LogPrint ("First fragment of message ", msgID, " not found. Discarded");
if (isLastMessage)
// last message is follow-on fragment
// not passed to anywhere because first fragment
i2p::DeleteI2NPMessage (msg);
else
// delete temporarty copy used for first fragment only
i2p::DeleteI2NPMessage (m.data);
m.nextFragmentNum = fragmentNum;
HandleFollowOnFragment (msgID, isLastFragment, m);
}
}
else
@ -178,6 +133,49 @@ namespace tunnel
}
}
void TunnelEndpoint::HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, const TunnelMessageBlockEx& m)
{
auto fragment = m.data->GetBuffer ();
auto size = m.data->GetLength ();
auto it = m_IncompleteMessages.find (msgID);
if (it != m_IncompleteMessages.end())
{
if (m.nextFragmentNum == it->second.nextFragmentNum)
{
I2NPMessage * incompleteMessage = it->second.data;
if (incompleteMessage->len + size < I2NP_MAX_MESSAGE_SIZE) // check if messega is not too long
{
memcpy (incompleteMessage->buf + incompleteMessage->len, fragment, size); // concatenate fragment
incompleteMessage->len += size;
if (isLastFragment)
{
// message complete
HandleNextMessage (it->second);
m_IncompleteMessages.erase (it);
}
else
it->second.nextFragmentNum++;
}
else
{
LogPrint ("Fragment ", m.nextFragmentNum, " of message ", msgID, "exceeds max I2NP message size. Message dropped");
i2p::DeleteI2NPMessage (it->second.data);
m_IncompleteMessages.erase (it);
}
}
else
{
LogPrint ("Unexpected fragment ", m.nextFragmentNum, " instead ", it->second.nextFragmentNum, " of message ", msgID, ". Discarded");
i2p::DeleteI2NPMessage (it->second.data);
m_IncompleteMessages.erase (it); // TODO: store unexpected fragment for a while
}
}
else
LogPrint ("First fragment of message ", msgID, " not found. Discarded");
i2p::DeleteI2NPMessage (m.data);
}
void TunnelEndpoint::HandleNextMessage (const TunnelMessageBlock& msg)
{
LogPrint ("TunnelMessage: handle fragment of ", msg.data->GetLength ()," bytes. Msg type ", (int)msg.data->GetHeader()->typeID);

13
TunnelEndpoint.h
View File

@ -13,6 +13,11 @@ namespace tunnel
{
class TunnelEndpoint
{
struct TunnelMessageBlockEx: public TunnelMessageBlock
{
uint8_t nextFragmentNum;
};
public:
TunnelEndpoint (): m_NumReceivedBytes (0) {};
@ -22,14 +27,10 @@ namespace tunnel
private:
void HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, const TunnelMessageBlockEx& m);
void HandleNextMessage (const TunnelMessageBlock& msg);
private:
struct TunnelMessageBlockEx: public TunnelMessageBlock
{
uint8_t nextFragmentNum;
};
private:
std::map<uint32_t, TunnelMessageBlockEx> m_IncompleteMessages;
size_t m_NumReceivedBytes;