[network] Create custom login system

Development Programming & Scripting C++
1

Hi, i’m new to UE4 and i’m trying to make a login system in a dedicated server / client model.
Goal :
User launch the client with a lvl_login
Connect to the server by clicking a button
Server check login IDs
Server travel the client to the lvl_world

I made the connection



void Anplayer::login(FString name, FString pass)
{
    ClientTravel("127.0.0.1", ETravelType::TRAVEL_Relative);
}





void Agame_mode::PostLogin(APlayerController* new_player)
{
    Super::PostLogin(new_player);

    new_player->ClientTravel("/Game/nebula/blueprint/lvl_world", ETravelType::TRAVEL_Relative, true);
}

Only way i found to make it work is compiling the server with the ClientTravel and the client without it.

  • Why the client is calling PostLogin ? I read gamemode was only server side.

If you have any good tutorial about this, it would be helpful.

Thanks for your help.

2

I tried to make 2 game modes too, don’t know if this is a good way, but then how could i connect to the server with the game_mode after logging using the login_mode ?

3

Sorry just to make it clear: are you sure the client isn’t authoritative?

If you are 100% sure PostLogin should only be called upon the Server, then something is wrong, if not - say its just an event, expressed both for server and client, so each can handle its own logic according to the NET level - just run a series of boolean checks to ensure the appropriate client-only behavior.

4

Well i don’t know how it’s supposed to work, i’m new with game engines. There is different behaviours when i change the play options (single process, run as standalone game etc …) so i’m totally lost. Sometimes level is loading, sometime it’s not sometimes there is 2 client launching (but i set 1 client). Single process works when i don’t launch the server from editor, i don’t understand anything …

I saw for a login system, i have to check the IDs with an external database then connect to the game server, but how do i make the link between the database player ID and the game server ?

5

I assumed you would have some experience.

GameMode only exists on the Server, therefore no necessary checks should be required… Are you sure the client is calling PostLogin? Do run a debug message on the function and see if it appears in your client.

As for your second question, you will need a handler, ideally a main-server which handles login requests from each individual dedicated server. If you want however the dedicated-server to directly check the DB - not recommended - search the forums for SQL wrappers.

6

Well it depends how i launch the client. As i said there is different behaviours depending on launch options.
For example, when i check autoconnect, postLogin is not called; if unchecked, postLogin is called.
But i don’t want to autoconnect, i want to login first then connect to the game server.

Yes i will use a main-server. When the login success, i get the user id but how i pass informations to the game server ?