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read header and payload separately

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orignal 2016-06-13 13:20:21 -04:00
parent 68482d712b
commit fb94d6ae2b
2 changed files with 53 additions and 96 deletions
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113
I2CP.cpp
View file

@ -115,15 +115,14 @@ namespace client
}
I2CPSession::I2CPSession (I2CPServer& owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket):
m_Owner (owner), m_Socket (socket),
m_NextMessage (nullptr), m_NextMessageLen (0), m_NextMessageOffset (0),
m_Owner (owner), m_Socket (socket), m_Payload (nullptr),
m_SessionID (0xFFFF), m_MessageID (0), m_IsSendAccepted (true)
{
}
I2CPSession::~I2CPSession ()
{
delete[] m_NextMessage;
delete[] m_Payload;
}
void I2CPSession::Start ()
@ -141,117 +140,72 @@ namespace client
if (m_Socket)
{
auto s = shared_from_this ();
m_Socket->async_read_some (boost::asio::buffer (m_Buffer, 1),
m_Socket->async_read_some (boost::asio::buffer (m_Header, 1),
[s](const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (!ecode && bytes_transferred > 0 && s->m_Buffer[0] == I2CP_PROTOCOL_BYTE)
s->Receive ();
if (!ecode && bytes_transferred > 0 && s->m_Header[0] == I2CP_PROTOCOL_BYTE)
s->ReceiveHeader ();
else
s->Terminate ();
});
}
}
void I2CPSession::Receive ()
void I2CPSession::ReceiveHeader ()
{
m_Socket->async_read_some (boost::asio::buffer (m_Buffer, I2CP_SESSION_BUFFER_SIZE),
std::bind (&I2CPSession::HandleReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
boost::asio::async_read (*m_Socket, boost::asio::buffer (m_Header, I2CP_HEADER_SIZE),
boost::asio::transfer_all (),
std::bind (&I2CPSession::HandleReceivedHeader, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void I2CPSession::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
void I2CPSession::HandleReceivedHeader (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
Terminate ();
else
{
size_t offset = 0; // from m_Buffer
if (m_NextMessage)
m_PayloadLen = bufbe32toh (m_Header + I2CP_HEADER_LENGTH_OFFSET);
if (m_PayloadLen > 0)
{
if (!m_NextMessageLen) // we didn't receive header yet
{
if (m_NextMessageOffset + bytes_transferred < I2CP_HEADER_SIZE)
{
// still no complete header
memcpy (m_NextMessage + m_NextMessageOffset, m_Buffer, bytes_transferred);
m_NextMessageOffset += bytes_transferred;
offset = bytes_transferred;
m_Payload = new uint8_t[m_PayloadLen];
ReceivePayload ();
}
else
else // no following payload
{
// we know message length now
offset = I2CP_HEADER_SIZE - m_NextMessageOffset;
memcpy (m_NextMessage + m_NextMessageOffset, m_Buffer, offset);
m_NextMessageLen = bufbe32toh (m_NextMessage + I2CP_HEADER_LENGTH_OFFSET) + I2CP_HEADER_SIZE;
m_NextMessageOffset = I2CP_HEADER_SIZE;
HandleMessage ();
ReceiveHeader (); // next message
}
}
}
if (offset < bytes_transferred)
void I2CPSession::ReceivePayload ()
{
auto msgRemainingLen = m_NextMessageLen - m_NextMessageOffset;
auto bufRemainingLen = bytes_transferred - offset;
if (bufRemainingLen < msgRemainingLen)
{
memcpy (m_NextMessage + m_NextMessageOffset, m_Buffer + offset, bufRemainingLen);
m_NextMessageOffset += bufRemainingLen;
offset += bufRemainingLen;
}
else
{
// m_NextMessage complete
offset += msgRemainingLen;
memcpy (m_NextMessage + m_NextMessageOffset, m_Buffer + offset, msgRemainingLen);
HandleNextMessage (m_NextMessage);
delete[] m_NextMessage;
m_NextMessage = nullptr;
}
}
}
// process the rest
while (offset < bytes_transferred)
{
if (bytes_transferred - offset < I2CP_HEADER_SIZE)
{
// we don't have message header yet
m_NextMessage = new uint8_t[0xFFFF]; // allocate 64K
m_NextMessageLen = 0; // we must set message length later
m_NextMessageOffset = bytes_transferred - offset;
memcpy (m_NextMessage, m_Buffer + offset, m_NextMessageOffset); // just copy it
break;
boost::asio::async_read (*m_Socket, boost::asio::buffer (m_Payload, m_PayloadLen),
boost::asio::transfer_all (),
std::bind (&I2CPSession::HandleReceivedPayload, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
auto msgLen = bufbe32toh (m_Buffer + offset + I2CP_HEADER_LENGTH_OFFSET) + I2CP_HEADER_SIZE;
if (msgLen > 0xFFFF) // 64K
void I2CPSession::HandleReceivedPayload (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
LogPrint (eLogError, "I2CP: message length ", msgLen, " exceeds 64K. Terminated");
if (ecode)
Terminate ();
return;
}
if (msgLen <= bytes_transferred - offset)
{
HandleNextMessage (m_Buffer + offset);
offset += msgLen;
}
else
{
m_NextMessageLen = msgLen;
m_NextMessageOffset = bytes_transferred - offset;
m_NextMessage = new uint8_t[m_NextMessageLen];
memcpy (m_NextMessage, m_Buffer + offset, m_NextMessageOffset);
offset = bytes_transferred;
}
}
Receive ();
HandleMessage ();
delete[] m_Payload;
m_Payload = nullptr;
m_PayloadLen = 0;
ReceiveHeader (); // next message
}
}
void I2CPSession::HandleNextMessage (const uint8_t * buf)
void I2CPSession::HandleMessage ()
{
auto handler = m_Owner.GetMessagesHandlers ()[buf[I2CP_HEADER_TYPE_OFFSET]];
auto handler = m_Owner.GetMessagesHandlers ()[m_Header[I2CP_HEADER_TYPE_OFFSET]];
if (handler)
(this->*handler)(buf + I2CP_HEADER_SIZE, bufbe32toh (buf + I2CP_HEADER_LENGTH_OFFSET));
(this->*handler)(m_Payload, m_PayloadLen);
else
LogPrint (eLogError, "I2CP: Unknown I2CP messsage ", (int)buf[I2CP_HEADER_TYPE_OFFSET]);
LogPrint (eLogError, "I2CP: Unknown I2CP messsage ", (int)m_Header[I2CP_HEADER_TYPE_OFFSET]);
}
void I2CPSession::Terminate ()
@ -267,6 +221,7 @@ namespace client
m_Socket = nullptr;
}
m_Owner.RemoveSession (GetSessionID ());
LogPrint (eLogDebug, "I2CP: session ", m_SessionID, " terminated");
}
void I2CPSession::SendI2CPMessage (uint8_t type, const uint8_t * payload, size_t len)

12
I2CP.h
View file

@ -126,9 +126,11 @@ namespace client
private:
void ReadProtocolByte ();
void Receive ();
void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleNextMessage (const uint8_t * buf);
void ReceiveHeader ();
void HandleReceivedHeader (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void ReceivePayload ();
void HandleReceivedPayload (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleMessage ();
void Terminate ();
void HandleI2CPMessageSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, const uint8_t * buf);
@ -143,8 +145,8 @@ namespace client
I2CPServer& m_Owner;
std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
uint8_t m_Buffer[I2CP_SESSION_BUFFER_SIZE], * m_NextMessage;
size_t m_NextMessageLen, m_NextMessageOffset;
uint8_t m_Header[I2CP_HEADER_SIZE], * m_Payload;
size_t m_PayloadLen;
std::shared_ptr<I2CPDestination> m_Destination;
uint16_t m_SessionID;