BOOL CEMSocket::AsyncSelect(long lEvent){
#ifdef EMSOCKET_DEBUG
if (lEvent&FD_READ)
EMTrace(" FD_READ");
if (lEvent&FD_CLOSE)
EMTrace(" FD_CLOSE");
if (lEvent&FD_WRITE)
EMTrace(" FD_WRITE");
#endif
// deadlake changed to AsyncSocketEx PROXYSUPPORT
if (m_SocketData.hSocket != INVALID_SOCKET)
return CEncryptedStreamSocket::AsyncSelect(lEvent);
return true;
}
void CEMSocket::ClearQueues()
{
EMTrace("CEMSocket::ClearQueues on %d",(SOCKET)this);
sendLocker.Lock();
for (POSITION pos = controlpacket_queue.GetHeadPosition(); pos != NULL; )
delete controlpacket_queue.GetNext(pos);
controlpacket_queue.RemoveAll();
for (POSITION pos = standartpacket_queue.GetHeadPosition(); pos != NULL; )
delete standartpacket_queue.GetNext(pos).packet;
standartpacket_queue.RemoveAll();
sendLocker.Unlock();
// Download (pseudo) rate control
downloadLimit = 0;
downloadLimitEnable = false;
pendingOnReceive = false;
// Download partial header
pendingHeaderSize = 0;
// Download partial packet
delete pendingPacket;
pendingPacket = NULL;
pendingPacketSize = 0;
// Upload control
delete[] sendbuffer;
sendbuffer = NULL;
sendblen = 0;
sent = 0;
}
void CEMSocket::ClearQueues()
{
EMTrace("CEMSocket::ClearQueues on %d",(SOCKET)this);
while(!m_controlPacketQueue.IsEmpty())
{
delete m_controlPacketQueue.RemoveHead();
}
while (!m_standardPacketQueue.IsEmpty())
{
delete m_standardPacketQueue.RemoveHead();
}
// Download (pseudo) rate control
m_dwDownloadLimit = 0;
m_bEnableDownloadLimit = false;
m_bPendingOnReceive = false;
// Download partial header
m_dwPendingHeaderSize = 0;
// Download partial packet
delete m_pPendingPacket;
m_pPendingPacket = NULL;
m_dwPendingPacketSize = 0;
// Upload control
delete[] m_pcSendBuffer;
m_pcSendBuffer = NULL;
m_dwSendBufLen = 0;
m_dwNumBytesSent = 0;
m_bLinkedPackets = false;
}
CEMSocket::~CEMSocket()
{
EMTrace("CEMSocket::~CEMSocket() on %d",(SOCKET)this);
ClearQueues();
RemoveAllLayers();
AsyncSelect(0);
}
CEMSocket::~CEMSocket(){
EMTrace("CEMSocket::~CEMSocket() on %d",(SOCKET)this);
// need to be locked here to know that the other methods
// won't be in the middle of things
sendLocker.Lock();
byConnected = ES_DISCONNECTED;
sendLocker.Unlock();
// now that we know no other method will keep adding to the queue
// we can remove ourself from the queue
theApp.uploadBandwidthThrottler->RemoveFromAllQueues(this);
ClearQueues();
RemoveAllLayers(); // deadlake PROXYSUPPORT
AsyncSelect(0);
}
void CEMSocket::OnReceive(int nErrorCode)
{
// the 2 meg size was taken from another place
static char GlobalReadBuffer[2000000];
// Check for an error code
if (nErrorCode != 0)
{
OnError(nErrorCode);
return;
}
// Check current connection state
if (byConnected == ES_DISCONNECTED)
{
TRACE("->%s: the sock is disconnected\n",__FUNCTION__);
return;
}
else
{
byConnected = ES_CONNECTED; // ES_DISCONNECTED, ES_NOTCONNECTED, ES_CONNECTED
}
// CPU load improvement
if (downloadLimitEnable == true && downloadLimit == 0)
{
#ifdef _DEBUG_CPU
TRACE("->%s: CPU load improvement\n",__FUNCTION__);
#endif
pendingOnReceive = true;
//Receive(GlobalReadBuffer + pendingHeaderSize, 0);
return;
}
// Remark: an overflow can not occur here
uint32 readMax = sizeof(GlobalReadBuffer) - pendingHeaderSize;
if (downloadLimitEnable == true && readMax > downloadLimit)
{
readMax = downloadLimit;
}
// We attempt to read up to 2 megs at a time (minus whatever is in our internal read buffer)
uint32 ret = Receive(GlobalReadBuffer + pendingHeaderSize, readMax);
GlobalReadBuffer[pendingHeaderSize+ret] = 0;
if (ret == SOCKET_ERROR || byConnected == ES_DISCONNECTED)
{
return;
}
// Bandwidth control
if (downloadLimitEnable == true)
{
// Update limit
downloadLimit -= GetRealReceivedBytes();
}
// CPU load improvement
// Detect if the socket's buffer is empty (or the size did match...)
pendingOnReceive = m_bFullReceive;
if (ret == 0)
return;
// Copy back the partial header into the global read buffer for processing
if (pendingHeaderSize > 0)
{
memcpy(GlobalReadBuffer, pendingHeader, pendingHeaderSize);
ret += pendingHeaderSize;
pendingHeaderSize = 0;
}
if (IsRawDataMode())
{
DataReceived((BYTE*)GlobalReadBuffer, ret);
return;
}
char *rptr = GlobalReadBuffer; // floating index initialized with begin of buffer
const char *rend = GlobalReadBuffer + ret; // end of buffer
// Loop, processing packets until we run out of them
while ((rend - rptr >= PACKET_HEADER_SIZE) || ((pendingPacket != NULL) && (rend - rptr > 0)))
{
// Two possibilities here:
//
// 1. There is no pending incoming packet
// 2. There is already a partial pending incoming packet
//
// It's important to remember that emule exchange two kinds of packet
// - The control packet
// - The data packet for the transport of the block
//
// The biggest part of the traffic is done with the data packets.
// The default size of one block is 10240 bytes (or less if compressed), but the
// maximal size for one packet on the network is 1300 bytes. It's the reason
// why most of the Blocks are splitted before to be sent.
//
// Conclusion: When the download limit is disabled, this method can be at least
// called 8 times (10240/1300) by the lower layer before a splitted packet is
// rebuild and transferred to the above layer for processing.
//
// The purpose of this algorithm is to limit the amount of data exchanged between buffers
if (pendingPacket == NULL)
{
pendingPacket = new Packet(rptr); // Create new packet container.
rptr += 6; // Only the header is initialized so far
// Bugfix We still need to check for a valid protocol
// Remark: the default eMule v0.26b had removed this test......
switch (pendingPacket->prot)
{
case OP_EDONKEYPROT:
case OP_PACKEDPROT:
case OP_EMULEPROT:
break;
default:
EMTrace("CEMSocket::OnReceive ERROR Wrong header");
delete pendingPacket;
pendingPacket = NULL;
OnError(ERR_WRONGHEADER);
return;
}
// Security: Check for buffer overflow (2MB)
if (pendingPacket->size > sizeof(GlobalReadBuffer))
{
delete pendingPacket;
pendingPacket = NULL;
OnError(ERR_TOOBIG);
return;
}
// Init data buffer
pendingPacket->pBuffer = new char[pendingPacket->size + 1];
pendingPacketSize = 0;
}
// Bytes ready to be copied into packet's internal buffer
ASSERT(rptr <= rend);
uint32 toCopy = ((pendingPacket->size - pendingPacketSize) < (uint32)(rend - rptr)) ?
(pendingPacket->size - pendingPacketSize) : (uint32)(rend - rptr);
// Copy Bytes from Global buffer to packet's internal buffer
memcpy(&pendingPacket->pBuffer[pendingPacketSize], rptr, toCopy);
pendingPacketSize += toCopy;
rptr += toCopy;
// Check if packet is complet
ASSERT(pendingPacket->size >= pendingPacketSize);
if (pendingPacket->size == pendingPacketSize)
{
#ifdef EMSOCKET_DEBUG
EMTrace("CEMSocket::PacketReceived on %d, opcode=%X, realSize=%d",
(SOCKET)this, pendingPacket->opcode, pendingPacket->GetRealPacketSize());
#endif
// Process packet
bool bPacketResult = PacketReceived(pendingPacket);
delete pendingPacket;
pendingPacket = NULL;
pendingPacketSize = 0;
if (!bPacketResult)
return;
}
}
// Finally, if there is any data left over, save it for next time
ASSERT(rptr <= rend);
ASSERT(rend - rptr < PACKET_HEADER_SIZE);
if (rptr != rend)
{
// Keep the partial head
pendingHeaderSize = rend - rptr;
memcpy(pendingHeader, rptr, pendingHeaderSize);
}
}
// pach2:
// written this overriden Receive to handle transparently FIN notifications coming from calls to recv()
// This was maybe(??) the cause of a lot of socket error, notably after a brutal close from peer
// also added trace so that we can debug after the fact ...
int CEMSocket::Receive(void* lpBuf, int nBufLen, int nFlags)
{
// EMTrace("CEMSocket::Receive on %d, maxSize=%d",(SOCKET)this,nBufLen);
int recvRetCode = CEncryptedStreamSocket::Receive(lpBuf,nBufLen,nFlags); // deadlake PROXYSUPPORT - changed to AsyncSocketEx
switch (recvRetCode)
{
case 0:
if (GetRealReceivedBytes() > 0) // we received data but it was for the underlying encryption layer - all fine
return 0;
//EMTrace("CEMSocket::##Received FIN on %d, maxSize=%d",(SOCKET)this,nBufLen);
// FIN received on socket // Connection is being closed by peer
//ASSERT (false);
if ( 0 == AsyncSelect(FD_CLOSE|FD_WRITE) )
{ // no more READ notifications ...
//int waserr = GetLastError(); // oups, AsyncSelect failed !!!
ASSERT(false);
}
return 0;
case SOCKET_ERROR:
switch (GetLastError())
{
case WSANOTINITIALISED:
ASSERT(false);
EMTrace("CEMSocket::OnReceive:A successful AfxSocketInit must occur before using this API.");
break;
case WSAENETDOWN:
ASSERT(true);
EMTrace("CEMSocket::OnReceive:The socket %d received a net down error",(SOCKET)this);
break;
case WSAENOTCONN: // The socket is not connected.
EMTrace("CEMSocket::OnReceive:The socket %d is not connected",(SOCKET)this);
break;
case WSAEINPROGRESS: // A blocking Windows Sockets operation is in progress.
EMTrace("CEMSocket::OnReceive:The socket %d is blocked",(SOCKET)this);
break;
case WSAEWOULDBLOCK: // The socket is marked as nonblocking and the Receive operation would block.
EMTrace("CEMSocket::OnReceive:The socket %d would block",(SOCKET)this);
break;
case WSAENOTSOCK: // The descriptor is not a socket.
EMTrace("CEMSocket::OnReceive:The descriptor %d is not a socket (may have been closed or never created)",(SOCKET)this);
break;
case WSAEOPNOTSUPP: // MSG_OOB was specified, but the socket is not of type SOCK_STREAM.
break;
case WSAESHUTDOWN: // The socket has been shut down; it is not possible to call Receive on a socket after ShutDown has been invoked with nHow set to 0 or 2.
EMTrace("CEMSocket::OnReceive:The socket %d has been shut down",(SOCKET)this);
break;
case WSAEMSGSIZE: // The datagram was too large to fit into the specified buffer and was truncated.
EMTrace("CEMSocket::OnReceive:The datagram was too large to fit and was truncated (socket %d)",(SOCKET)this);
break;
case WSAEINVAL: // The socket has not been bound with Bind.
EMTrace("CEMSocket::OnReceive:The socket %d has not been bound",(SOCKET)this);
break;
case WSAECONNABORTED: // The virtual circuit was aborted due to timeout or other failure.
EMTrace("CEMSocket::OnReceive:The socket %d has not been bound",(SOCKET)this);
break;
case WSAECONNRESET: // The virtual circuit was reset by the remote side.
EMTrace("CEMSocket::OnReceive:The socket %d has not been bound",(SOCKET)this);
break;
default:
EMTrace("CEMSocket::OnReceive:Unexpected socket error %x on socket %d",GetLastError(),(SOCKET)this);
break;
}
break;
default:
// EMTrace("CEMSocket::OnReceive on %d, receivedSize=%d",(SOCKET)this,recvRetCode);
return recvRetCode;
}
return SOCKET_ERROR;
}
void CEMSocket::OnReceive(int iErrorCode)
{
// The 2 meg size was taken from another place // MOREVIT - Um, what??
static char g_arrcReadBuffer[2102400]; // 16*TCP window (16*131400)
// Check for an error code
if (iErrorCode != 0)
{
OnError(iErrorCode);
return;
}
// Check current connection state
if (m_eConnectionState == ES_DISCONNECTED)
return;
else
m_eConnectionState = ES_CONNECTED; // ES_DISCONNECTED, ES_NOTCONNECTED, ES_CONNECTED
// * CPU load improvement
if (m_bEnableDownloadLimit && m_dwDownloadLimit == 0)
{
EMTrace("CEMSocket::OnReceive blocked by limit");
m_bPendingOnReceive = true;
return;
}
// Determine the maximum amount of data we can read, allowing for the download limit (if any)
// Remark: an overflow can not occur here
uint32 dwReadMax = sizeof(g_arrcReadBuffer) - m_dwPendingHeaderSize;
if (m_bEnableDownloadLimit && dwReadMax > m_dwDownloadLimit)
dwReadMax = m_dwDownloadLimit;
// We attempt to read up to 2 megs at a time (minus whatever is in our internal read buffer)
uint32 dwNumBytesReceived = Receive(g_arrcReadBuffer + m_dwPendingHeaderSize, dwReadMax);
if (dwNumBytesReceived == SOCKET_ERROR || dwNumBytesReceived == 0)
{
// TODO: Get error information from GetLastError()?
return;
}
// * Bandwidth control
if (m_bEnableDownloadLimit)
{
// Reduce the download limit by the number of bytes received.
m_dwDownloadLimit -= dwNumBytesReceived;
}
// * CPU load improvement
// Detect if the socket's buffer is empty (or the size did match...)
m_bPendingOnReceive = (dwNumBytesReceived == dwReadMax);
// Copy back the partial header into the global read buffer for processing
if (m_dwPendingHeaderSize > 0)
{
memcpy(g_arrcReadBuffer, m_arrcPendingHeader, m_dwPendingHeaderSize);
dwNumBytesReceived += m_dwPendingHeaderSize;
m_dwPendingHeaderSize = 0;
}
char *pcReadBuffer = g_arrcReadBuffer; // floating index initialized with begin of buffer
const char *pcReadBufferEnd = g_arrcReadBuffer + dwNumBytesReceived; // end of buffer
// Loop, processing packets until we run out of them
while ( (pcReadBufferEnd - pcReadBuffer >= PACKET_HEADER_SIZE)
|| ((m_pPendingPacket != NULL) && (pcReadBufferEnd - pcReadBuffer > 0)) )
{
// Two possibilities here:
//
// 1. There is no pending incoming packet
// 2. There is already a partial pending incoming packet
//
// It's important to remember that emule exchange two kinds of packet
// - The control packet
// - The data packet for the transport of the block
//
// The biggest part of the traffic is done with the data packets.
// The default size of one block is 10240 bytes (or less if compressed), but the
// maximal size for one packet on the network is 1300 bytes. It's the reason
// why most of the Blocks are splitted before to be sent.
//
// Conclusion: When the download limit is disabled, this method can be at least
// called 8 times (10240/1300) by the lower layer before a split packet is
// rebuild and transferred to the above layer for processing.
//
// The purpose of this algorithm is to limit the amount of data exchanged between buffers
if (m_pPendingPacket == NULL)
{
// Recheck current connection state as it can be changed after data reception
if (m_eConnectionState == ES_DISCONNECTED)
return;
// Check the header data
PacketHeader_Struct *pNewHeader = reinterpret_cast<PacketHeader_Struct*>(pcReadBuffer);
// Bugfix: We still need to check for a valid protocol
// Remark: the default eMule v0.26b had removed this test......
switch (pNewHeader->byteEDonkeyProtocol)
{
case OP_EDONKEYPROT:
case OP_PACKEDPROT:
case OP_EMULEPROT:
break;
default:
EMTrace("%s: ERROR - Wrong protocol in packet header", __FUNCTION__);
OnError(ERR_WRONGHEADER);
return;
}
// Security: Check for buffer overflow (2MB)
if ((pNewHeader->dwPacketLength - 1) > sizeof(g_arrcReadBuffer))
{
OnError(ERR_TOOBIG);
return;
}
// Create new packet container
m_pPendingPacket = new Packet(pNewHeader);
// Only the header is initialized so far. Advance past it
pcReadBuffer += sizeof(PacketHeader_Struct);
// Init data buffer
m_pPendingPacket->m_pcBuffer = new char[m_pPendingPacket->m_dwSize + 1];
m_dwPendingPacketSize = 0;
}
// Bytes ready to be copied into packet's internal buffer
ASSERT(pcReadBuffer <= pcReadBufferEnd);
uint32 dwBytesToCopy = ((m_pPendingPacket->m_dwSize - m_dwPendingPacketSize) < static_cast<uint32>(pcReadBufferEnd - pcReadBuffer))
? (m_pPendingPacket->m_dwSize - m_dwPendingPacketSize)
: static_cast<uint32>(pcReadBufferEnd - pcReadBuffer);
// Copy bytes from Global buffer to packet's internal buffer
memcpy2(&m_pPendingPacket->m_pcBuffer[m_dwPendingPacketSize], pcReadBuffer, dwBytesToCopy);
m_dwPendingPacketSize += dwBytesToCopy;
pcReadBuffer += dwBytesToCopy;
// Check if packet is complete
ASSERT(m_pPendingPacket->m_dwSize >= m_dwPendingPacketSize);
if (m_pPendingPacket->m_dwSize == m_dwPendingPacketSize)
{
#ifdef EMSOCKET_DEBUG
EMTrace("CEMSocket::PacketReceived on %d, opcode=%X, realSize=%d",
static_cast<SOCKET>(this), m_pPendingPacket->m_eOpcode, m_pPendingPacket->GetRealPacketSize());
#endif EMSOCKET_DEBUG
// Process packet
m_bInPacketReceived = true;
PacketReceived(m_pPendingPacket);
m_bInPacketReceived = false;
delete m_pPendingPacket;
m_pPendingPacket = NULL;
m_dwPendingPacketSize = 0;
}
}
// Finally, if there is any data left over, save it for next time
ASSERT(pcReadBuffer <= pcReadBufferEnd);
ASSERT(pcReadBufferEnd - pcReadBuffer < sizeof(PacketHeader_Struct));
if (pcReadBuffer != pcReadBufferEnd)
{
// Keep the partial head
m_dwPendingHeaderSize = pcReadBufferEnd - pcReadBuffer;
memcpy(m_arrcPendingHeader, pcReadBuffer, m_dwPendingHeaderSize);
}
}
