Always require lobby authentication for lobby matches, refs #3549 / 0fd8aa2a77 / D897.

This is due to too many oversteppings of the lobby Terms of Use
following JS mods that implemented an UI for players to join lobby games
with arbitrary nicknames or 'replace' / impersonate other players in
lobby games.

Agreed with: user1, Dunedan
Code proofread by: Vladislav
Minor discussions with: Imarok, Hannibal_Barca, smiley, fpre, bb, nani
refs
https://wildfiregames.com/forum/index.php?/topic/24722-improving-mod-security/

This was SVN commit r21877.

source/network/NetServer.cpp

@@ -26,11 +26,13 @@
 #include "NetStats.h"
 
 #include "lib/external_libraries/enet.h"
+#include "lib/types.h"
 #include "network/StunClient.h"
 #include "ps/CLogger.h"
 #include "ps/ConfigDB.h"
 #include "ps/GUID.h"
 #include "ps/Profile.h"
+#include "ps/ThreadUtil.h"
 #include "scriptinterface/ScriptInterface.h"
 #include "scriptinterface/ScriptRuntime.h"
 #include "simulation2/Simulation2.h"
@@ -43,6 +45,8 @@
 #include <miniupnpc/upnperrors.h>
 #endif
 
+#include <string>
+
 /**
  * Number of peers to allocate for the enet host.
  * Limited by ENET_PROTOCOL_MAXIMUM_PEER_ID (4096).
@@ -1556,7 +1560,8 @@ void CNetServerWorker::SendHolePunchingMessage(const CStr& ipStr, u16 port)
 
 
 CNetServer::CNetServer(bool useLobbyAuth, int autostartPlayers) :
-	m_Worker(new CNetServerWorker(useLobbyAuth, autostartPlayers))
+	m_Worker(new CNetServerWorker(useLobbyAuth, autostartPlayers)),
+	m_LobbyAuth(useLobbyAuth)
 {
 }
 
@@ -1565,6 +1570,11 @@ CNetServer::~CNetServer()
 	delete m_Worker;
 }
 
+bool CNetServer::UseLobbyAuth() const
+{
+	return m_LobbyAuth;
+}
+
 bool CNetServer::SetupConnection(const u16 port)
 {
 	return m_Worker->SetupConnection(port);