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Code Issues Releases Activity

check for duplicate and missing fragments

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This commit is contained in:
orignal 2014-04-12 21:13:30 -04:00
parent e1027ffb7b
commit a510e7c2c6
2 changed files with 39 additions and 7 deletions
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36
SSU.cpp
View File

@ -27,6 +27,12 @@ namespace ssu
SSUSession::~SSUSession ()
{
delete m_DHKeysPair;
for (auto it: m_IncomleteMessages)
if (it.second)
{
DeleteI2NPMessage (it.second->msg);
delete it.second;
}
}
void SSUSession::CreateAESandMacKey (uint8_t * pubKey, uint8_t * aesKey, uint8_t * macKey)
@ -673,9 +679,29 @@ namespace ssu
auto it = m_IncomleteMessages.find (msgID);
if (it != m_IncomleteMessages.end ())
{
msg = it->second;
memcpy (msg->buf + msg->len, buf, fragmentSize);
msg->len += fragmentSize;
if (fragmentNum == it->second->nextFragmentNum)
{
// expected fragment
msg = it->second->msg;
memcpy (msg->buf + msg->len, buf, fragmentSize);
msg->len += fragmentSize;
it->second->nextFragmentNum++;
}
else if (fragmentNum < it->second->nextFragmentNum)
// duplicate fragment
LogPrint ("Duplicate fragment ", fragmentNum, " of message ", msgID, ". Ignored");
else
{
// missing fragment
LogPrint ("Missing fragments from ", it->second->nextFragmentNum, " to ", fragmentNum - 1, " of message ", msgID);
//TODO
}
if (isLast)
{
delete it->second;
m_IncomleteMessages.erase (it);
}
}
else
// TODO:
@ -691,12 +717,10 @@ namespace ssu
if (msg)
{
if (!fragmentNum && !isLast)
m_IncomleteMessages[msgID] = msg;
m_IncomleteMessages[msgID] = new IncompleteMessage (msg);
if (isLast)
{
SendMsgAck (msgID);
if (fragmentNum > 0)
m_IncomleteMessages.erase (msgID);
msg->FromSSU (msgID);
if (m_State == eSessionStateEstablished)
i2p::HandleI2NPMessage (msg);

10
SSU.h
View File

@ -124,6 +124,14 @@ namespace ssu
void HandleTerminationTimer (const boost::system::error_code& ecode);
private:
struct IncompleteMessage
{
I2NPMessage * msg;
uint8_t nextFragmentNum;
IncompleteMessage (I2NPMessage * m): msg (m), nextFragmentNum (1) {};
};
SSUServer& m_Server;
boost::asio::ip::udp::endpoint m_RemoteEndpoint;
@ -137,7 +145,7 @@ namespace ssu
CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption m_Encryption;
CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption m_Decryption;
uint8_t m_SessionKey[32], m_MacKey[32];
std::map<uint32_t, I2NPMessage *> m_IncomleteMessages;
std::map<uint32_t, IncompleteMessage *> m_IncomleteMessages;
std::list<i2p::I2NPMessage *> m_DelayedMessages;
};