Websocket getting remote IP on connect

Question

Can I get remote IP address inside @OnOpen method of @ServletEndpoint class? I tried follow this Accessing HttpSession from HttpServletRequest in a Web Socket @SocketEndpoint but as in Websocket - httpSession returns null it doesn't work.

Anyway I only need clients IP address.

score 4 · Accepted Answer · edited May 23 '17 at 10:30

4

The JSR-356 Websocket specification does not expose client IP address.

You may try one of the 2 hacks descibed in this response: JSR-356 WebSockets with Tomcat - How to limit connections within single IP address?

edited May 23 '17 at 10:30

Community

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answered Sep 18 '14 at 14:49

Benjamin

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OK I used the httpSession and ServletRequestListener and it works for me. Thank you. – ZdeenaP Sep 22 '14 at 08:33

Aere Xu · Answer 2 · 2017-02-07T09:02:53.887

4

Added: Works for Jetty implementation and it's not a common solution. Thanks to Benjamin !

Don't know if you still need it. I myself directly get the IP from the socket Session.

@OnOpen
public void onWebSocketConnect(Session session) {
    System.Out.println(session.getUserProperties().get("javax.websocket.endpoint.remoteAddress"))
}

Then I get /127.0.0.1:57045

edited Feb 07 '17 at 09:02

answered Mar 16 '16 at 06:43

Aere Xu

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The `javax.websocket.endpoint.remoteAddress` property is not part of the JSR-356 (see http://jcp.org/en/jsr/detail?id=356). I suspect this is something specific to Jetty's websocket implementation. For example, I tried on WildFly 8.2, which uses Undertow, and the `session.getUserProperties()` returns a Map with no predefined values... So this solution is not portable and may not work on all websocket implementations. – Benjamin Jan 11 '17 at 08:42
@Benjamin I agree. I was using Jetty implementation but found no answer at that time. Then I tried most of its API to find a solution for me and post the answer here. I haven't try any other implementation. – Aere Xu Feb 07 '17 at 09:01
For Tomcat there is a workaround with reflection: https://stackoverflow.com/a/32629586/166524 – lapo Jan 19 '18 at 10:27
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@AereXu this does not work if Jetty is behind NGINX. – Alpha2k Feb 26 '18 at 22:12

weberjn · Answer 3 · 2023-01-12T07:05:56.483

0

Usually the client will be some Javascript code in a web page delivered by your web application.

Have the client first fetch a servlet, that calls req.getRemoteAddr() and so on Servlet returns this data. Javascript then can send the data as @PathParam to the @ServerEndpoint.

edited Jan 12 '23 at 07:05

answered Jan 11 '23 at 23:28

weberjn

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Websocket getting remote IP on connect

3 Answers3