Proper client timeout detection (#19906)

- Properly detect client timeout when logged into a character after a configurable time (default 60s) has passed without the client sending any packets.
- Fixes issues with crashed clients leaving characters in the world for a very long time (default 15 minutes), as well as edge case exploits involving intentionally pausing client execution for some amount of time.

(cherry picked from commit 7dfd472f8dff6ce067572e2887c2beb56d9ba9de)

src/server/game/Server/WorldSession.cpp

@@ -142,7 +142,7 @@ WorldSession::WorldSession(uint32 id, std::string&& name, uint32 battlenetAccoun
     if (sock)
     {
         m_Address = sock->GetRemoteIpAddress().to_string();
-        ResetTimeOutTime();
+        ResetTimeOutTime(false);
         LoginDatabase.PExecute("UPDATE account SET online = 1 WHERE id = %u;", GetAccountId());     // One-time query
     }
 
@@ -327,7 +327,8 @@ bool WorldSession::Update(uint32 diff, PacketFilter& updater)
     UpdateTimeOutTime(diff);
 
     ///- Before we process anything:
-    /// If necessary, kick the player from the character select screen
+    /// If necessary, kick the player because the client didn't send anything for too long
+    /// (or they've been idling in character select)
     if (IsConnectionIdle())
         m_Socket[CONNECTION_TYPE_REALM]->CloseSocket();
 
@@ -697,9 +698,12 @@ char const* WorldSession::GetTrinityString(uint32 entry) const
     return sObjectMgr->GetTrinityString(entry, GetSessionDbLocaleIndex());
 }
 
-void WorldSession::ResetTimeOutTime()
+void WorldSession::ResetTimeOutTime(bool onlyActive)
 {
-    m_timeOutTime = int32(sWorld->getIntConfig(CONFIG_SOCKET_TIMEOUTTIME));
+    if (GetPlayer())
+        m_timeOutTime = int32(sWorld->getIntConfig(CONFIG_SOCKET_TIMEOUTTIME_ACTIVE));
+    else if (!onlyActive)
+        m_timeOutTime = int32(sWorld->getIntConfig(CONFIG_SOCKET_TIMEOUTTIME));
 }
 
 void WorldSession::Handle_NULL(WorldPackets::Null& null)
@@ -1069,7 +1073,7 @@ void WorldSession::InitializeSessionCallback(LoginDatabaseQueryHolder* realmHold
         SendAuthWaitQue(0);
 
     SetInQueue(false);
-    ResetTimeOutTime();
+    ResetTimeOutTime(false);
 
     SendSetTimeZoneInformation();
     SendFeatureSystemStatusGlueScreen();