Method ServerStats

src/ServerList.cpp:271–349

void CServerList::ServerStats()
{
	uint64 tNow = ::GetTickCount64();
	time_t currentTime = time(NULL);

	if (theApp->IsConnectedED2K() && !m_servers.empty()) {
		CServer* ping_server = GetNextStatServer();
		CServer* test = ping_server;
		if (!ping_server) {
			return;
		}

		while (ping_server->GetLastPingedTime() && currentTime < (ping_server->GetLastPingedTime() + UDPSERVSTATREASKTIME)) {
			ping_server = GetNextStatServer();
			if (ping_server == test) {
				return;
			}
		}

		if (ping_server->GetFailedCount() >= thePrefs::GetDeadserverRetries() && thePrefs::DeadServer() && !ping_server->IsStaticMember()) {
			RemoveServer(ping_server);
			return;
		}

		srand((unsigned)time(NULL));
		ping_server->SetRealLastPingedTime(currentTime); // this is not used to calculate the next ping, but only to ensure a minimum delay for premature pings
		if (!ping_server->GetCryptPingReplyPending() && (!ping_server->GetLastPingedTime() || currentTime >= (ping_server->GetLastPingedTime() + UDPSERVSTATREASKTIME)) && theApp->GetPublicIP() && thePrefs::IsServerCryptLayerUDPEnabled()) {
			// We try a obfsucation ping first and wait 20 seconds for an answer
			// if it doesn't get responded to, we don't count it as error but continue with a normal ping
			ping_server->SetCryptPingReplyPending(true);
			uint32 nPacketLen = 4 + (uint8)(rand() % 16); // max padding 16 bytes
			CScopedArray<uint8_t> pRawPacket(nPacketLen);
			uint32 dwChallenge = (rand() << 17) | (rand() << 2) | (rand() & 0x03);
			if (dwChallenge == 0) {
				dwChallenge++;
			}

			memcpy(pRawPacket.get(), &dwChallenge, sizeof(uint32));
			for (uint32 i = 4; i < nPacketLen; i++) { // fillng up the remaining bytes with random data
				pRawPacket[i] = (uint8)rand();
			}

			ping_server->SetChallenge(dwChallenge);
			ping_server->SetLastPinged(tNow); //in milliseconds, to calculate the ping
			ping_server->SetLastPingedTime((currentTime - UDPSERVSTATREASKTIME) + 20); //in seconds, give it 20 extra seconds to respond

			AddDebugLogLineN(logServerUDP, CFormat(">> Sending OP__GlobServStatReq (obfuscated) to server %s:%u") % ping_server->GetAddress() % ping_server->GetPort());

			CPacket* packet = new CPacket(pRawPacket[1], nPacketLen - 2, pRawPacket[0]);
			packet->CopyToDataBuffer(0, pRawPacket.get() + 2, nPacketLen - 2);

			theStats::AddUpOverheadServer(packet->GetPacketSize());
			theApp->serverconnect->SendUDPPacket(packet, ping_server, true, true /*raw packet*/, 12 /* Port offset is 12 for obfuscated encryption*/);
		} else if (ping_server->GetCryptPingReplyPending() || theApp->GetPublicIP() == 0 || !thePrefs::IsServerCryptLayerUDPEnabled()){
			// our obfsucation ping request was not answered, so probably the server doesn'T supports obfuscation
			// continue with a normal request
			if (ping_server->GetCryptPingReplyPending() && thePrefs::IsServerCryptLayerUDPEnabled()) {
				AddDebugLogLineN(logServerUDP, "CryptPing failed for server " + ping_server->GetListName());