void CTraverseBySourceExchange::OnRecvSync(const uchar * data, int /*len*/, DWORD /*ip*/, WORD /*port*/)
{
TRACE("Receive NAT Sync Request From Source Exchange!\n");
//UINT realsize=len-1;// VC-linhai[2007-08-06]:warning C4189: “realsize” : 局部变量已初始化但不引用
const uchar * realdata=data+1;
DWORD cip = *(DWORD*)(realdata);
WORD cport = *(WORD*)(realdata+4);
if(cip==0 || cport==0)
{
return;
}
const uchar * id=realdata+6;
DWORD ConnAck = 0;
memcpy(&ConnAck, id+16, 4);
TRACE("recv sync, ConnAck=%08x\n", ConnAck);
#ifdef _DEBUG
in_addr addr;
addr.s_addr = cip;
TRACE("peer addr of %02X%02X%02X%02X = %s:%d\n", id[0], id[1], id[2],id[3],
inet_ntoa(addr), ntohs(cport));
#endif
uchar myid[16];
GetMyUserHash(myid);
if(memcmp(id, myid, 16)==0)
{
_AddLogLine(false, _T("ERROR: recv myself for traversal"));
return;
}
CAsyncSocketEx * pASock=NULL;
CUpDownClient * pClient= CGlobalVariable::clientlist->FindClientByUserHash(id);
if(pClient)
{
pASock = pClient->socket;
if(! pASock)
{
CRuntimeClass * pClassSocket = RUNTIME_CLASS(CClientReqSocket);
CClientReqSocket * socket = static_cast<CClientReqSocket*>(pClassSocket->CreateObject());
socket->SetClient(pClient);
if (!socket->Create())
{
socket->Safe_Delete();
return;
}
pClient->socket = socket;
pASock = socket;
}
ASSERT(pASock);
if(! pASock)
{
return;
}
}
else
{
TRACE("\n->%s: Accept a incoming sock for %02X%02X%02X%02X\n", __FUNCTION__,
id[0],id[1],id[2],id[3]);
pASock = CGlobalVariable::natthread->GetTempASock(id);
}
m_dwClientIp = cip;
m_wClientPort = cport;
m_dwState |=NAT_S_SYNC;
SendPingPacket();
}
void CListenSocket::OnAccept(int nErrorCode)
{
if (!nErrorCode)
{
m_nPendingConnections++;
if (m_nPendingConnections < 1){
ASSERT(0);
m_nPendingConnections = 1;
}
if (TooManySockets(true) && !CGlobalVariable::serverconnect->IsConnecting()){
StopListening();
return;
}
else if (!bListening)
ReStartListening(); //If the client is still at maxconnections, this will allow it to go above it.. But if you don't, you will get a lowID on all servers.
uint32 nFataErrors = 0;
while (m_nPendingConnections > 0)
{
m_nPendingConnections--;
CClientReqSocket* newclient;
SOCKADDR_IN SockAddr = {0};
int iSockAddrLen = sizeof SockAddr;
if (thePrefs.GetConditionalTCPAccept() && !thePrefs.GetProxySettings().UseProxy)
{
_iAcceptConnectionCondRejected = 0;
SOCKET sNew = WSAAccept(m_SocketData.hSocket, (SOCKADDR*)&SockAddr, &iSockAddrLen, AcceptConnectionCond, 0);
if (sNew == INVALID_SOCKET){
DWORD nError = GetLastError();
if (nError == WSAEWOULDBLOCK){
DebugLogError(LOG_STATUSBAR, _T("%hs: Backlogcounter says %u connections waiting, Accept() says WSAEWOULDBLOCK - setting counter to zero!"), __FUNCTION__, m_nPendingConnections);
m_nPendingConnections = 0;
break;
}
else{
if (nError != WSAECONNREFUSED || _iAcceptConnectionCondRejected == 0){
DebugLogError(LOG_STATUSBAR, _T("%hs: Backlogcounter says %u connections waiting, Accept() says %s - setting counter to zero!"), __FUNCTION__, m_nPendingConnections, GetErrorMessage(nError, 1));
nFataErrors++;
}
else if (_iAcceptConnectionCondRejected == 1)
theStats.filteredclients++;
}
if (nFataErrors > 10){
// the question is what todo on a error. We cant just ignore it because then the backlog will fill up
// and lock everything. We can also just endlos try to repeat it because this will lock up eMule
// this should basically never happen anyway
// however if we are in such a position, try to reinitalize the socket.
DebugLogError(LOG_STATUSBAR, _T("%hs: Accept() Error Loop, recreating socket"), __FUNCTION__);
Close();
StartListening();
m_nPendingConnections = 0;
break;
}
continue;
}
newclient = new CClientReqSocket;
VERIFY( newclient->InitAsyncSocketExInstance() );
newclient->m_SocketData.hSocket = sNew;
newclient->AttachHandle(sNew);
AddConnection();
}
else
{
newclient = new CClientReqSocket;
if (!Accept(*newclient, (SOCKADDR*)&SockAddr, &iSockAddrLen)){
newclient->Safe_Delete();
DWORD nError = GetLastError();
if (nError == WSAEWOULDBLOCK){
DebugLogError(LOG_STATUSBAR, _T("%hs: Backlogcounter says %u connections waiting, Accept() says WSAEWOULDBLOCK - setting counter to zero!"), __FUNCTION__, m_nPendingConnections);
m_nPendingConnections = 0;
break;
}
else{
DebugLogError(LOG_STATUSBAR, _T("%hs: Backlogcounter says %u connections waiting, Accept() says %s - setting counter to zero!"), __FUNCTION__, m_nPendingConnections, GetErrorMessage(nError, 1));
nFataErrors++;
}
if (nFataErrors > 10){
// the question is what todo on a error. We cant just ignore it because then the backlog will fill up
// and lock everything. We can also just endlos try to repeat it because this will lock up eMule
// this should basically never happen anyway
// however if we are in such a position, try to reinitalize the socket.
DebugLogError(LOG_STATUSBAR, _T("%hs: Accept() Error Loop, recreating socket"), __FUNCTION__);
Close();
StartListening();
m_nPendingConnections = 0;
break;
}
continue;
}
AddConnection();
if (SockAddr.sin_addr.S_un.S_addr == 0) // for safety..
{
iSockAddrLen = sizeof SockAddr;
newclient->GetPeerName((SOCKADDR*)&SockAddr, &iSockAddrLen);
DebugLogWarning(_T("SockAddr.sin_addr.S_un.S_addr == 0; GetPeerName returned %s"), ipstr(SockAddr.sin_addr.S_un.S_addr));
}
ASSERT( SockAddr.sin_addr.S_un.S_addr != 0 && SockAddr.sin_addr.S_un.S_addr != INADDR_NONE );
if (CGlobalVariable::ipfilter->IsFiltered(SockAddr.sin_addr.S_un.S_addr)){
if (thePrefs.GetLogFilteredIPs())
AddDebugLogLine(false, _T("Rejecting connection attempt (IP=%s) - IP filter (%s)"), ipstr(SockAddr.sin_addr.S_un.S_addr), CGlobalVariable::ipfilter->GetLastHit());
newclient->Safe_Delete();
theStats.filteredclients++;
continue;
}
if (CGlobalVariable::clientlist->IsBannedClient(SockAddr.sin_addr.S_un.S_addr)){
if (thePrefs.GetLogBannedClients()){
CUpDownClient* pClient = CGlobalVariable::clientlist->FindClientByIP(SockAddr.sin_addr.S_un.S_addr);
AddDebugLogLine(false, _T("Rejecting connection attempt of banned client %s %s"), ipstr(SockAddr.sin_addr.S_un.S_addr), pClient->DbgGetClientInfo());
}
newclient->Safe_Delete();
continue;
}
}
newclient->AsyncSelect(FD_WRITE | FD_READ | FD_CLOSE);
}
ASSERT( m_nPendingConnections >= 0 );
}
}