Android Question ServerSocket binding to localhost only?

_marek · Nov 7, 2023

Hello,
is there a way to bind ServerSocket to localhost only (so it accepts connections only from localhost)? Or is the socket always bound to all existing network interfaces and it cannot be changed?

Thanks,
Marek

Erel · Nov 7, 2023

Try this:
1. Copy B4J jNetwork library to your additional libs folder.
2. Use it instead of Network.
3. Use this code to bind the socket: https://www.b4x.com/android/forum/threads/serversocket-listening-on-a-single-ip.56832/#post-357698

If it works in debug mode and fails in release mode then it means that you need to disable the NetworkOnMainThread check (it is simple to disable).

Erel · Nov 7, 2023

Try this:
1. Copy B4J jNetwork library to your additional libs folder.
2. Use it instead of Network.
3. Use this code to bind the socket: https://www.b4x.com/android/forum/threads/serversocket-listening-on-a-single-ip.56832/#post-357698

If it works in debug mode and fails in release mode then it means that you need to disable the NetworkOnMainThread check (it is simple to disable).

_marek · Nov 7, 2023

It works (also in release mode). Server now accepts only localhost connections. Thanks.

So question now is, can jNetwork replace Network (B4A) library in B4A project? I am using ServerSocket, Socket, UDPSocket from B4A Network lib. Quick test shows that after switching from B4A Network to jNetwork all is working OK. Can this be confirmed please?

What about serverSocket.GetMyWifiIP from B4A Network? Can`t find any substitution in jNetwork lib.

Thanks again.

Erel · Nov 9, 2023

B4A Network v1.54 is attached. Use this one. It includes the small change that was required.
It will be included in the next update of B4A.

_marek · Nov 9, 2023

Great, thanks!
I confirm, the added functionality of binding a server socket to a specific IP address is working in B4A Network v1.54.

Android Question ServerSocket binding to localhost only?

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