Java socket programming - requests

Question

I am writing a messaging application in java using sockets and currently the server will wait for a request and just automatically accept it:

ServerSocket s = new ServerSocket(1254);
Socket s1 = s.accept();

If there any way in which I can detect requests to the server and allow the server to only accept certain requests?

How would you want to distinguish one request from another? Originating IP? — Evan Knowles
– Evan Knowles, Commented Jun 26, 2017 at 11:27
Not before you accept it. So accept it then filtrer it (based on your condition). Passing the Socket to a distinct Thread to let the ServerSocket accept the next one is better too. — AxelH
– AxelH, Commented Jun 26, 2017 at 11:28
a socket is a low level object. Unless you are working with devices that can't support http, I would go other routes — bichito
– bichito, Commented Jun 26, 2017 at 11:32

Lucurious · Accepted Answer · 2017-06-26 11:28:49Z

1

It's unclear to me what you mean with "certain requests", however you can accept it, validate it and if it is not a "certain request" you simply drop the connection.

answered Jun 26, 2017 at 11:28

Lucurious

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3 Comments

nafas Over a year ago

this answer should have been a comment mate

user207421 Over a year ago

@nafas Why? It provides a solution, and a solution that is also provided in another answer that you haven't commented on.

Lucurious Over a year ago

@iehrlich It does provide a solution: "you can accept it, validate it and if it is not a "certain request" you simply drop the connection."

Deepak Bhatia · Accepted Answer · 2017-06-26 11:36:21Z

1

AFAIK there is no way that you can deny request without accepting it, (until and unless you have some reverse proxy setup like nginx).

After accepting the socket you can check out the various parameters for example Socket's remote address (check for more info java.net.Socket), and close the socket if you don't want the connection to be established.

edited Jun 26, 2017 at 11:36

answered Jun 26, 2017 at 11:33

Deepak Bhatia

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2 Comments

AxelH Over a year ago

Just to add some context, if the idea is to secure your process to prevent an overflood by robot, you can always add some rules to your firewall to only accept some IP range, based on the application of this socket of course

Deepak Bhatia Over a year ago

@AxelH (+1) thanks for your comment but for that point only I edited my answer and added 'until and unless you have some reverse proxy setup like nginx,` and off course firewall can be one more option from so many others available....

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