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cleanup unclaimed out-of-sequence fragments

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orignal 2016-11-09 14:51:55 -05:00
parent b83e7e6c5c
commit 46f927fc1b
5 changed files with 44 additions and 24 deletions
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5
Tunnel.cpp
View file

@ -714,6 +714,8 @@ namespace tunnel
if (ts + TUNNEL_EXPIRATION_THRESHOLD > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
tunnel->SetState (eTunnelStateExpiring);
else // we don't need to cleanup expiring tunnels
tunnel->Cleanup ();
}
it++;
}
@ -763,7 +765,10 @@ namespace tunnel
it = m_TransitTunnels.erase (it);
}
else
{
tunnel->Cleanup ();
it++;
}
}
}

4
Tunnel.h
View file

@ -165,6 +165,10 @@ namespace tunnel
virtual size_t GetNumReceivedBytes () const { return m_Endpoint.GetNumReceivedBytes (); };
void Print (std::stringstream& s) const;
bool IsInbound() const { return true; }
// override TunnelBase
void Cleanup () { m_Endpoint.Cleanup (); };
private:
TunnelEndpoint m_Endpoint;

1
TunnelBase.h
View file

@ -37,6 +37,7 @@ namespace tunnel
m_TunnelID (tunnelID), m_NextTunnelID (nextTunnelID), m_NextIdent (nextIdent),
m_CreationTime (i2p::util::GetSecondsSinceEpoch ()) {};
virtual ~TunnelBase () {};
virtual void Cleanup () {};
virtual void HandleTunnelDataMsg (std::shared_ptr<const i2p::I2NPMessage> tunnelMsg) = 0;
virtual void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg) = 0;

53
TunnelEndpoint.cpp
View file

@ -6,6 +6,7 @@
#include "I2NPProtocol.h"
#include "Transports.h"
#include "RouterContext.h"
#include "Timestamp.h"
#include "TunnelEndpoint.h"
namespace i2p
@ -192,7 +193,7 @@ namespace tunnel
void TunnelEndpoint::AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum, bool isLastFragment, std::shared_ptr<I2NPMessage> data)
{
if (!m_OutOfSequenceFragments.insert ({{msgID, fragmentNum}, {fragmentNum, isLastFragment, data}}).second)
if (!m_OutOfSequenceFragments.insert ({{msgID, fragmentNum}, {isLastFragment, data, i2p::util::GetMillisecondsSinceEpoch () }}).second)
LogPrint (eLogInfo, "TunnelMessage: duplicate out-of-sequence fragment ", fragmentNum, " of message ", msgID);
}
@ -213,30 +214,25 @@ namespace tunnel
{
auto it = m_OutOfSequenceFragments.find ({msgID, msg.nextFragmentNum});
if (it != m_OutOfSequenceFragments.end ())
{
if (it->second.fragmentNum == msg.nextFragmentNum)
{
LogPrint (eLogDebug, "TunnelMessage: Out-of-sequence fragment ", (int)msg.nextFragmentNum, " of message ", msgID, " found");
size_t size = it->second.data->GetLength ();
if (msg.data->len + size > msg.data->maxLen)
{
LogPrint (eLogDebug, "TunnelMessage: Out-of-sequence fragment ", (int)it->second.fragmentNum, " of message ", msgID, " found");
size_t size = it->second.data->GetLength ();
if (msg.data->len + size > msg.data->maxLen)
{
LogPrint (eLogWarning, "TunnelMessage: Tunnel endpoint I2NP message size ", msg.data->maxLen, " is not enough");
auto newMsg = NewI2NPMessage ();
*newMsg = *(msg.data);
msg.data = newMsg;
}
if (msg.data->Concat (it->second.data->GetBuffer (), size) < size) // concatenate out-of-sync fragment
LogPrint (eLogError, "TunnelMessage: Tunnel endpoint I2NP buffer overflow ", msg.data->maxLen);
if (it->second.isLastFragment)
// message complete
msg.nextFragmentNum = 0;
else
msg.nextFragmentNum++;
m_OutOfSequenceFragments.erase (it);
return true;
LogPrint (eLogWarning, "TunnelMessage: Tunnel endpoint I2NP message size ", msg.data->maxLen, " is not enough");
auto newMsg = NewI2NPMessage ();
*newMsg = *(msg.data);
msg.data = newMsg;
}
if (msg.data->Concat (it->second.data->GetBuffer (), size) < size) // concatenate out-of-sync fragment
LogPrint (eLogError, "TunnelMessage: Tunnel endpoint I2NP buffer overflow ", msg.data->maxLen);
if (it->second.isLastFragment)
// message complete
msg.nextFragmentNum = 0;
else
LogPrint (eLogError, "Tunnel message: next fragment ", (int)it->second.fragmentNum, " of message ", msgID, " mismatch. ", (int)msg.nextFragmentNum, " expected");
msg.nextFragmentNum++;
m_OutOfSequenceFragments.erase (it);
return true;
}
return false;
}
@ -275,6 +271,19 @@ namespace tunnel
default:
LogPrint (eLogError, "TunnelMessage: Unknown delivery type ", (int)msg.deliveryType);
};
}
void TunnelEndpoint::Cleanup ()
{
auto ts = i2p::util::GetMillisecondsSinceEpoch ();
// out-of-sequence fragments
for (auto it = m_OutOfSequenceFragments.begin (); it != m_OutOfSequenceFragments.end ();)
{
if (ts > it->second.receiveTime + i2p::I2NP_MESSAGE_EXPIRATION_TIMEOUT)
it = m_OutOfSequenceFragments.erase (it);
else
++it;
}
}
}
}

5
TunnelEndpoint.h
View file

@ -20,9 +20,9 @@ namespace tunnel
struct Fragment
{
uint8_t fragmentNum;
bool isLastFragment;
std::shared_ptr<I2NPMessage> data;
uint64_t receiveTime; // milliseconds since epoch
};
public:
@ -30,7 +30,8 @@ namespace tunnel
TunnelEndpoint (bool isInbound): m_IsInbound (isInbound), m_NumReceivedBytes (0) {};
~TunnelEndpoint ();
size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
void Cleanup ();
void HandleDecryptedTunnelDataMsg (std::shared_ptr<I2NPMessage> msg);
private: