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eliminated extra I2NP messages for fragments

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orignal 2021-06-26 17:40:25 -04:00
parent 9fb8e8a582
commit b9476791f4
2 changed files with 65 additions and 60 deletions
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109
libi2pd/TunnelEndpoint.cpp
View File

@ -52,26 +52,25 @@ namespace tunnel
bool isFollowOnFragment = flag & 0x80, isLastFragment = true;
uint32_t msgID = 0;
int fragmentNum = 0;
TunnelMessageBlockEx& m = m_CurrentMessage;
if (!isFollowOnFragment)
{
// first fragment
if (m_CurrentMsgID)
AddIncompleteCurrentMessage (); // we have got a new message while previous is not complete
m.deliveryType = (TunnelDeliveryType)((flag >> 5) & 0x03);
switch (m.deliveryType)
m_CurrentMessage.deliveryType = (TunnelDeliveryType)((flag >> 5) & 0x03);
switch (m_CurrentMessage.deliveryType)
{
case eDeliveryTypeLocal: // 0
break;
case eDeliveryTypeTunnel: // 1
m.tunnelID = bufbe32toh (fragment);
m_CurrentMessage.tunnelID = bufbe32toh (fragment);
fragment += 4; // tunnelID
m.hash = i2p::data::IdentHash (fragment);
m_CurrentMessage.hash = i2p::data::IdentHash (fragment);
fragment += 32; // hash
break;
case eDeliveryTypeRouter: // 2
m.hash = i2p::data::IdentHash (fragment);
m_CurrentMessage.hash = i2p::data::IdentHash (fragment);
fragment += 32; // to hash
break;
default: ;
@ -99,42 +98,51 @@ namespace tunnel
uint16_t size = bufbe16toh (fragment);
fragment += 2;
if (isFollowOnFragment && m_CurrentMsgID && m_CurrentMsgID == msgID &&
m_CurrentMessage.nextFragmentNum == fragmentNum)
// handle fragment
if (isFollowOnFragment)
{
HandleCurrenMessageFollowOnFragment (fragment, size, isLastFragment);
fragment += size;
continue;
}
msg->offset = fragment - msg->buf;
msg->len = msg->offset + size;
if (msg->len > msg->maxLen)
{
LogPrint (eLogError, "TunnelMessage: fragment is too long ", (int)size);
m_CurrentMsgID = 0; m_CurrentMessage.data = nullptr;
return;
}
if (fragment + size < decrypted + TUNNEL_DATA_ENCRYPTED_SIZE)
{
// this is not last message. we have to copy it
m.data = NewI2NPTunnelMessage ();
m.data->offset += TUNNEL_GATEWAY_HEADER_SIZE; // reserve room for TunnelGateway header
m.data->len += TUNNEL_GATEWAY_HEADER_SIZE;
*(m.data) = *msg;
// existing message
if (m_CurrentMsgID && m_CurrentMsgID == msgID && m_CurrentMessage.nextFragmentNum == fragmentNum)
HandleCurrenMessageFollowOnFragment (fragment, size, isLastFragment); // previous
else
{
HandleFollowOnFragment (msgID, isLastFragment, fragmentNum, fragment, size); // another
m_CurrentMsgID = 0; m_CurrentMessage.data = nullptr;
}
}
else
m.data = msg;
if (!isFollowOnFragment)
{
// new message
msg->offset = fragment - msg->buf;
msg->len = msg->offset + size;
// check message size
if (msg->len > msg->maxLen)
{
LogPrint (eLogError, "TunnelMessage: fragment is too long ", (int)size);
m_CurrentMsgID = 0; m_CurrentMessage.data = nullptr;
return;
}
// create new or assign I2NP message
if (fragment + size < decrypted + TUNNEL_DATA_ENCRYPTED_SIZE)
{
// this is not last message. we have to copy it
m_CurrentMessage.data = NewI2NPTunnelMessage ();
m_CurrentMessage.data->offset += TUNNEL_GATEWAY_HEADER_SIZE; // reserve room for TunnelGateway header
m_CurrentMessage.data->len += TUNNEL_GATEWAY_HEADER_SIZE;
*(m_CurrentMessage.data) = *msg;
}
else
m_CurrentMessage.data = msg;
if (isLastFragment)
{
HandleNextMessage (m);
// single message
HandleNextMessage (m_CurrentMessage);
m_CurrentMsgID = 0; m_CurrentMessage.data = nullptr;
}
else if (msgID)
{
// first fragment of a new message
m_CurrentMessage.nextFragmentNum = 1;
m_CurrentMessage.receiveTime = i2p::util::GetMillisecondsSinceEpoch ();
HandleOutOfSequenceFragments (msgID, m_CurrentMessage);
@ -145,12 +153,6 @@ namespace tunnel
m_CurrentMsgID = 0; m_CurrentMessage.data = nullptr;
}
}
else
{
m.nextFragmentNum = fragmentNum;
HandleFollowOnFragment (msgID, isLastFragment, m);
m_CurrentMsgID = 0; m_CurrentMessage.data = nullptr;
}
fragment += size;
}
@ -159,15 +161,14 @@ namespace tunnel
LogPrint (eLogError, "TunnelMessage: zero not found");
}
void TunnelEndpoint::HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, const TunnelMessageBlockEx& m)
void TunnelEndpoint::HandleFollowOnFragment (uint32_t msgID, bool isLastFragment,
uint8_t fragmentNum, const uint8_t * fragment, size_t size)
{
auto fragment = m.data->GetBuffer ();
auto size = m.data->GetLength ();
auto it = m_IncompleteMessages.find (msgID);
if (it != m_IncompleteMessages.end())
{
auto& msg = it->second;
if (m.nextFragmentNum == msg.nextFragmentNum)
if (fragmentNum == msg.nextFragmentNum)
{
if (ConcatFollowOnFragment (msg, fragment, size))
{
@ -185,20 +186,20 @@ namespace tunnel
}
else
{
LogPrint (eLogError, "TunnelMessage: Fragment ", m.nextFragmentNum, " of message ", msgID, "exceeds max I2NP message size, message dropped");
LogPrint (eLogError, "TunnelMessage: Fragment ", fragmentNum, " of message ", msgID, "exceeds max I2NP message size, message dropped");
m_IncompleteMessages.erase (it);
}
}
else
{
LogPrint (eLogWarning, "TunnelMessage: Unexpected fragment ", (int)m.nextFragmentNum, " instead ", (int)msg.nextFragmentNum, " of message ", msgID, ", saved");
AddOutOfSequenceFragment (msgID, m.nextFragmentNum, isLastFragment, m.data);
LogPrint (eLogWarning, "TunnelMessage: Unexpected fragment ", (int)fragmentNum, " instead ", (int)msg.nextFragmentNum, " of message ", msgID, ", saved");
AddOutOfSequenceFragment (msgID, fragmentNum, isLastFragment, fragment, size);
}
}
else
{
LogPrint (eLogWarning, "TunnelMessage: First fragment of message ", msgID, " not found, saved");
AddOutOfSequenceFragment (msgID, m.nextFragmentNum, isLastFragment, m.data);
AddOutOfSequenceFragment (msgID, fragmentNum, isLastFragment, fragment, size);
}
}
@ -259,10 +260,12 @@ namespace tunnel
}
}
void TunnelEndpoint::AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum, bool isLastFragment, std::shared_ptr<I2NPMessage> data)
void TunnelEndpoint::AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum,
bool isLastFragment, const uint8_t * fragment, size_t size)
{
if (!m_OutOfSequenceFragments.insert ({(uint64_t)msgID << 32 | fragmentNum,
{isLastFragment, data, i2p::util::GetMillisecondsSinceEpoch () }}).second)
std::unique_ptr<Fragment> f(new Fragment (isLastFragment, i2p::util::GetMillisecondsSinceEpoch (), size));
memcpy (f->data.data (), fragment, size);
if (!m_OutOfSequenceFragments.emplace ((uint64_t)msgID << 32 | fragmentNum, std::move (f)).second)
LogPrint (eLogInfo, "TunnelMessage: duplicate out-of-sequence fragment ", fragmentNum, " of message ", msgID);
}
@ -291,7 +294,7 @@ namespace tunnel
if (it != m_OutOfSequenceFragments.end ())
{
LogPrint (eLogDebug, "TunnelMessage: Out-of-sequence fragment ", (int)msg.nextFragmentNum, " of message ", msgID, " found");
size_t size = it->second.data->GetLength ();
size_t size = it->second->data.size ();
if (msg.data->len + size > msg.data->maxLen)
{
LogPrint (eLogWarning, "TunnelMessage: Tunnel endpoint I2NP message size ", msg.data->maxLen, " is not enough");
@ -299,9 +302,9 @@ namespace tunnel
*newMsg = *(msg.data);
msg.data = newMsg;
}
if (msg.data->Concat (it->second.data->GetBuffer (), size) < size) // concatenate out-of-sync fragment
if (msg.data->Concat (it->second->data.data (), size) < size) // concatenate out-of-sync fragment
LogPrint (eLogError, "TunnelMessage: Tunnel endpoint I2NP buffer overflow ", msg.data->maxLen);
if (it->second.isLastFragment)
if (it->second->isLastFragment)
// message complete
msg.nextFragmentNum = 0;
else
@ -354,7 +357,7 @@ namespace tunnel
// out-of-sequence fragments
for (auto it = m_OutOfSequenceFragments.begin (); it != m_OutOfSequenceFragments.end ();)
{
if (ts > it->second.receiveTime + i2p::I2NP_MESSAGE_EXPIRATION_TIMEOUT)
if (ts > it->second->receiveTime + i2p::I2NP_MESSAGE_EXPIRATION_TIMEOUT)
it = m_OutOfSequenceFragments.erase (it);
else
++it;

10
libi2pd/TunnelEndpoint.h
View File

@ -11,6 +11,7 @@
#include <inttypes.h>
#include <unordered_map>
#include <vector>
#include <string>
#include "I2NPProtocol.h"
#include "TunnelBase.h"
@ -29,9 +30,10 @@ namespace tunnel
struct Fragment
{
Fragment (bool last, uint64_t t, size_t size): isLastFragment (last), receiveTime (t), data (size) {};
bool isLastFragment;
std::shared_ptr<I2NPMessage> data;
uint64_t receiveTime; // milliseconds since epoch
std::vector<uint8_t> data;
};
public:
@ -45,12 +47,12 @@ namespace tunnel
private:
void HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, const TunnelMessageBlockEx& m);
void HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, uint8_t fragmentNum, const uint8_t * fragment, size_t size);
bool ConcatFollowOnFragment (TunnelMessageBlockEx& msg, const uint8_t * fragment, size_t size) const; // true if success
void HandleCurrenMessageFollowOnFragment (const uint8_t * frgament, size_t size, bool isLastFragment);
void HandleNextMessage (const TunnelMessageBlock& msg);
void AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum, bool isLastFragment, std::shared_ptr<I2NPMessage> data);
void AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum, bool isLastFragment, const uint8_t * fragment, size_t size);
bool ConcatNextOutOfSequenceFragment (uint32_t msgID, TunnelMessageBlockEx& msg); // true if something added
void HandleOutOfSequenceFragments (uint32_t msgID, TunnelMessageBlockEx& msg);
void AddIncompleteCurrentMessage ();
@ -58,7 +60,7 @@ namespace tunnel
private:
std::unordered_map<uint32_t, TunnelMessageBlockEx> m_IncompleteMessages;
std::unordered_map<uint64_t, Fragment> m_OutOfSequenceFragments; // ((msgID << 8) + fragment#)->fragment
std::unordered_map<uint64_t, std::unique_ptr<Fragment> > m_OutOfSequenceFragments; // ((msgID << 8) + fragment#)->fragment
bool m_IsInbound;
size_t m_NumReceivedBytes;
TunnelMessageBlockEx m_CurrentMessage;