clientlist.cpp

另外一款开放源码的高质量p2p源码软件

{
	for (POSITION pos = list.GetHeadPosition(); pos != NULL;)
	{
		CUpDownClient* cur_client = list.GetNext(pos);
		if (cur_client->GetIP() == ip && cur_client->GetKadPort() == port)
			return cur_client;
	}
	return 0;
}

//TODO: This needs to change to a random Kad user.
CUpDownClient* CClientList::GetRandomKadClient() const
{
	for (POSITION pos = list.GetHeadPosition(); pos != NULL;)
	{
		CUpDownClient* cur_client =	list.GetNext(pos);
		if (cur_client->GetKadPort())
			return cur_client;
	}
	return 0;
}

CUpDownClient* CClientList::FindClientByServerID(uint32 uServerIP, uint32 uED2KUserID) const
{
	uint32 uHybridUserID = ntohl(uED2KUserID);
	for (POSITION pos = list.GetHeadPosition(); pos != NULL;)
	{
		CUpDownClient* cur_client =	list.GetNext(pos);
		if (cur_client->GetServerIP() == uServerIP && cur_client->GetUserIDHybrid() == uHybridUserID)
			return cur_client;
	}
	return 0;
}

void CClientList::AddBannedClient(uint32 dwIP){
	m_bannedList.SetAt(dwIP, ::GetTickCount());
}

bool CClientList::IsBannedClient(uint32 dwIP) /*const*/
{
	uint32 dwBantime;
	if (m_bannedList.Lookup(dwIP, dwBantime)){
		if (dwBantime + CLIENTBANTIME > ::GetTickCount())
			return true;
		RemoveBannedClient(dwIP);
	}
	return false; 
}

void CClientList::RemoveBannedClient(uint32 dwIP){
	m_bannedList.RemoveKey(dwIP);
}

////////////////////////////////////////
/// Tracked clients
void CClientList::AddTrackClient(CUpDownClient* toadd){
	CDeletedClient* pResult = 0;
	if (m_trackedClientsList.Lookup(toadd->GetIP(), pResult)){
		pResult->m_dwInserted = ::GetTickCount();
		for (int i = 0; i != pResult->m_ItemsList.GetCount(); i++){
			if (pResult->m_ItemsList[i].nPort == toadd->GetUserPort()){
				// already tracked, update
				pResult->m_ItemsList[i].pHash = toadd->Credits();
				return;
			}
		}
		PORTANDHASH porthash = { toadd->GetUserPort(), toadd->Credits()};
		pResult->m_ItemsList.Add(porthash);
	}
	else{
		m_trackedClientsList.SetAt(toadd->GetIP(), new CDeletedClient(toadd));
	}
}

// true = everything ok, hash didn't changed
// false = hash changed
bool CClientList::ComparePriorUserhash(uint32 dwIP, uint16 nPort, void* pNewHash){
	CDeletedClient* pResult = 0;
	if (m_trackedClientsList.Lookup(dwIP, pResult)){
		for (int i = 0; i != pResult->m_ItemsList.GetCount(); i++){
			if (pResult->m_ItemsList[i].nPort == nPort){
				if (pResult->m_ItemsList[i].pHash != pNewHash)
					return false;
				else
					break;
			}
		}
	}
	return true;
}

UINT CClientList::GetClientsFromIP(uint32 dwIP) const
{
	CDeletedClient* pResult;
	if (m_trackedClientsList.Lookup(dwIP, pResult))
		return pResult->m_ItemsList.GetCount();
	return 0;
}

void CClientList::TrackBadRequest(const CUpDownClient* upcClient, sint32 nIncreaseCounter){
	CDeletedClient* pResult = NULL;
	if (upcClient->GetIP() == 0){
		ASSERT( false );
		return;
	}
	if (m_trackedClientsList.Lookup(upcClient->GetIP(), pResult)){
		pResult->m_dwInserted = ::GetTickCount();
		pResult->m_cBadRequest += nIncreaseCounter;
	}
	else{
		CDeletedClient* ccToAdd = new CDeletedClient(upcClient);
		ccToAdd->m_cBadRequest = nIncreaseCounter;
		m_trackedClientsList.SetAt(upcClient->GetIP(), ccToAdd);
	}
}

uint32 CClientList::GetBadRequests(const CUpDownClient* upcClient) const{
	CDeletedClient* pResult = NULL;
	if (upcClient->GetIP() == 0){
		ASSERT( false );
		return 0;
	}
	if (m_trackedClientsList.Lookup(upcClient->GetIP(), pResult)){
		return pResult->m_cBadRequest;
	}
	else
		return 0;
}

void CClientList::Process(){
	const uint32 cur_tick = ::GetTickCount();
	if (m_dwLastBannCleanUp + BAN_CLEANUP_TIME < cur_tick){
		m_dwLastBannCleanUp = cur_tick;
		
		POSITION pos = m_bannedList.GetStartPosition();
		uint32 nKey;
		uint32 dwBantime;
		while (pos != NULL){
			m_bannedList.GetNextAssoc( pos, nKey, dwBantime );
			if (dwBantime + CLIENTBANTIME < cur_tick )
				RemoveBannedClient(nKey);
		}
	}

	
	if (m_dwLastTrackedCleanUp + TRACKED_CLEANUP_TIME < cur_tick ){
		m_dwLastTrackedCleanUp = cur_tick;
		if (thePrefs.GetLogBannedClients())
			AddDebugLogLine(false, _T("Cleaning up TrackedClientList, %i clients on List..."), m_trackedClientsList.GetCount());
		POSITION pos = m_trackedClientsList.GetStartPosition();
		uint32 nKey;
		CDeletedClient* pResult;
		while (pos != NULL){
			m_trackedClientsList.GetNextAssoc( pos, nKey, pResult );
			if (pResult->m_dwInserted + KEEPTRACK_TIME < cur_tick ){
				m_trackedClientsList.RemoveKey(nKey);
				delete pResult;
			}
		}
		if (thePrefs.GetLogBannedClients())
			AddDebugLogLine(false, _T("...done, %i clients left on list"), m_trackedClientsList.GetCount());
	}

	//We need to try to connect to the clients in RequestTCPList
	//If connected, remove them from the list and send a message back to Kad so we can send a ACK.
	//If we don't connect, we need to remove the client..
	//The sockets timeout should delete this object.
	POSITION pos1, pos2;
	for (pos1 = RequestTCPList.GetHeadPosition();( pos2 = pos1 ) != NULL;)
	{
		RequestTCPList.GetNext(pos1);
		CUpDownClient* cur_client =	RequestTCPList.GetAt(pos2);
		switch(cur_client->GetKadState())
		{
			case KS_QUEUED_FWCHECK:
				//I removed the self check here because we already did it when we added the client object.
				cur_client->TryToConnect();
				break;

			case KS_CONNECTING_FWCHECK:
				//Ignore this state as we are just waiting for results.
				break;

			case KS_CONNECTED_FWCHECK:
				//Send the Kademlia client a TCP connection ack!
				Kademlia::CKademlia::getUDPListener()->sendNullPacket(KADEMLIA_FIREWALLED_ACK, ntohl(cur_client->GetIP()), cur_client->GetKadPort());
				cur_client->SetKadState(KS_NONE);
				break;
			case KS_QUEUED_BUDDY:
				//a client lowID client wanting to be in the Kad network
				break;
			case KS_CONNECTED_BUDDY:
				//a client lowID client wanting to be in the Kad network
				//Not working at the moment so just set to none..
				cur_client->SetKadState(KS_NONE);
			default:
				RemoveTCP(cur_client);
		}
	}

	CleanUpClientList();
}

#ifdef _DEBUG
void CClientList::Debug_SocketDeleted(CClientReqSocket* deleted){
	for (POSITION pos = list.GetHeadPosition(); pos != NULL;){
		CUpDownClient* cur_client =	list.GetNext(pos);
		if (!AfxIsValidAddress(cur_client, sizeof(CUpDownClient))) {
			AfxDebugBreak();
		}
		if (thePrefs.m_iDbgHeap >= 2)
			ASSERT_VALID(cur_client);
		if (cur_client->socket == deleted){
			AfxDebugBreak();
		}
	}
}
#endif

bool CClientList::IsValidClient(CUpDownClient* tocheck)
{
	if (thePrefs.m_iDbgHeap >= 2)
		ASSERT_VALID(tocheck);
	return list.Find(tocheck);
}

void CClientList::RequestTCP(Kademlia::CContact* contact)
{
	uint32 nContactIP = ntohl(contact->getIPAddress());
	//If eMule already knows this client, abort this.. It could cause conflicts.
	//Although the odds of this happening is very small, it could still happen.
	if (FindClientByIP(nContactIP, contact->getTCPPort()))
	{
		return;
	}

	// don't connect ourself
	if (theApp.serverconnect->GetLocalIP() == nContactIP && thePrefs.GetPort() == contact->getTCPPort())
		return;

	//Add client to the lists to be processed.
	CUpDownClient* pNewClient = new CUpDownClient(0, contact->getTCPPort(), contact->getIPAddress(), 0, 0, false );
	pNewClient->SetKadPort(contact->getUDPPort());
	pNewClient->SetKadState(KS_QUEUED_FWCHECK);
	RequestTCPList.AddTail(pNewClient);
	AddClient(pNewClient);
}

void CClientList::RemoveTCP(CUpDownClient* torem){
	POSITION pos = RequestTCPList.Find(torem);
	if(pos)
	{
		RequestTCPList.RemoveAt(pos);
	}
}

void CClientList::CleanUpClientList(){
	// we remove clients which are not needed any more by time
	// this check is also done on CUpDownClient::Disconnected, however it will not catch all
	// cases (if a client changes the state without beeing connected
	//
	// Adding this check directly to every point where any state changes would be more effective,
	// is however not compatible with the current code, because there are points where a client has
	// no state for some code lines and the code is also not prepared that a client object gets
	// invalid while working with it (aka setting a new state)
	// so this way is just the easy and safe one to go (as long as emule is basically single threaded)
	const uint32 cur_tick = ::GetTickCount();
	if (m_dwLastClientCleanUp + CLIENTLIST_CLEANUP_TIME < cur_tick ){
		m_dwLastClientCleanUp = cur_tick;
		POSITION pos1, pos2;
		uint32 cDeleted = 0;
		for (pos1 = list.GetHeadPosition();( pos2 = pos1 ) != NULL;){
			list.GetNext(pos1);
			CUpDownClient* pCurClient =	list.GetAt(pos2);
			if ((pCurClient->GetUploadState() == US_NONE || pCurClient->GetUploadState() == US_BANNED && !pCurClient->IsBanned())
				&& pCurClient->GetDownloadState() == DS_NONE
				&& pCurClient->GetChatState() == MS_NONE
				&& pCurClient->GetKadState() == KS_NONE
				&& pCurClient->socket == NULL)
			{
				cDeleted++;
				delete pCurClient;
			}
		}
		DEBUG_ONLY(AddDebugLogLine(false,_T("Cleaned ClientList, removed %i not used known clients"), cDeleted));
	}
}


CDeletedClient::CDeletedClient(const CUpDownClient* pClient)
{
	m_cBadRequest = 0;
	m_dwInserted = ::GetTickCount();
	PORTANDHASH porthash = { pClient->GetUserPort(), pClient->Credits()};
	m_ItemsList.Add(porthash);
}

// ZZ:DownloadManager -->
void CClientList::ProcessA4AFClients() {
    //if(thePrefs.GetLogA4AF()) AddDebugLogLine(false, _T(">>> Starting A4AF check"));
	POSITION pos1, pos2;
	for (pos1 = list.GetHeadPosition();( pos2 = pos1 ) != NULL;){
		list.GetNext(pos1);
		CUpDownClient* cur_client =	list.GetAt(pos2);

        if(cur_client->GetDownloadState() != DS_DOWNLOADING &&
           cur_client->GetDownloadState() != DS_CONNECTED &&
           (!cur_client->m_OtherRequests_list.IsEmpty() || !cur_client->m_OtherNoNeeded_list.IsEmpty())) {
            //AddDebugLogLine(false, "+++ ZZ:DownloadManager: Trying for better file for source: %s '%s'", cur_client->GetUserName(), cur_client->reqfile->GetFileName());
               cur_client->SwapToAnotherFile(_T("Periodic A4AF check CClientList::ProcessA4AFClients()"), false, false, false, NULL, true, false);
        }
	}
    //if(thePrefs.GetLogA4AF()) AddDebugLogLine(false, _T(">>> Done with A4AF check"));
}
// <-- ZZ:DownloadManager