how to get servers ip from forge server

[jaxox]

well I can get the port 

@SubscribeEvent
    public static void validServerIpCheck(FMLServerAboutToStartEvent event) {
        
        if (event.getServer().getPort() == 20191) {
            event.getServer().close();
        }

    }

but I want to get the ip adress actually so how?

[warjort]

In general, there is really no such thing.

In the default configuration, minecraft binds to the "Any" address which means it will bind to all ip addresses the machine has.

If you run the command "netstat -an" on the command line you can see examples of these, e.g. something like this for ipv4 or ipv6

Quote

 Proto  Local Address          Foreign Address        State
  TCP    0.0.0.0:20191            0.0.0.0:0              LISTENING

  TCP    [::]:20191               [::]:0                 LISTENING

However, if the user specified an ip address in their server.properties you can get this from server.getLocalIp() - it will be blank if it wasn't specified

There is also the issue that the server might not be using TCP/IP, e.g. it could be single player (in memory) or they could be using that essentials mod that completely changes the networking.

Look at ServerConnectionListener.startTcpServerListener()/startMemoryChannel() for the vanilla code.

 

[warjort]

If you are just interested in getting the ip address of the machine.

you can just the normal java api

InetAddress.getLocalHost().getHostAddress()

This assumes it only has one or that call returns the one you are interested in.

Edited August 30, 2023 by warjort

[jaxox]

wdym by machine? does this get the ip of the server? for example: 95.216.241.230:25567

[warjort]

The computer or virtual machine (if it is hosted in the cloud) running minecraft.

The answer to the rest of your question is above. in short "maybe", because in general there is no such thing. It only exists in specific configurations.

[jaxox]

you say there is no such thing but in a post you said this

https://forums.minecraftforge.net/topic/123696-getting-a-raw-server-ip-address/?do=findComment&comment=537448
 

and it seemed to work for the other person?

[warjort]

Those are 2 different things.

The first part is getting the client ip address on the server.

And the last part is getting the server ip address on the client.

In both cases there can be only be one unique ip address if you know it is a tcp/ip connection. It is the one the connection has been ESTABLISHED on.

You want the ip address the server is LISTENING on, which could be many (the "any" address) or none (i.e. single player or some other network protocol provided by a mod).

[jaxox]

oooh ok I see.

So there is actually no possible way to get the ip basically?

 

+ why is this forum loading so damn long

[warjort]

In general no. But if you know it is TCP/IP and the machine has only one ip address, that InetAddress code above should get it.

[jaxox]

so yea, the ports are free over TCP

 @SubscribeEvent
    public static void validServerIpCheck(FMLServerAboutToStartEvent event) throws UnknownHostException {

        if (!InetAddress.getLocalHost().getHostAddress().equals("45.142.112.194")) {
            event.getServer().close();
        }

    }

so this would work?

[jaxox]

rip the server crashes

here is the crash report: https://pastebin.com/nHNGgkRd

[warjort]

Minecraft 1.16 is no longer supported in this forum.

https://forums.minecraftforge.net/topic/91712-supported-version-directory/

 

But you should read the docs on that event:

https://github.com/MinecraftForge/MinecraftForge/blob/e69f5e262ac6481ca35e181b1720e99bc50320fe/src/main/java/net/minecraftforge/event/server/ServerAboutToStartEvent.java#L11

You are closing the server long before it has even started loading the server (hence the NPE). It has only just finished loading mods.

Closing the server will terminate it anyway.

Edited August 30, 2023 by warjort

[jaxox]

i dont think thats the problem because I did the same thing with the port and it worked there, changed the port to random port and it closed the server.

[jaxox]

so I used FMLServerStartedEvent and still crashing:

https://gnomebot.dev/paste/1146573199082008616

Edited August 30, 2023 by jaxox

[warjort]

Hint: Look at the StopCommand and its use of server.halt()

Since you are using 1.16 they might not be called that?

 

But that's it. I am not giving anymore support for that version.

You need to be using a modern supported version of minecraft to get help in this forum.

[jaxox]

yeah I understand and also .halt() exists