javascript - how to limit the amount of data being sent by the client through websocket? - Stack Overflow

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I am using the ws module and I'd like to limit the amount of data being sent by the client over websocket to 1Mb. This will prevent a malicious user from sending huge amounts of data (in terms of GB) causing the server to run out of memory, which would cause denial of service errors for every normal user.
For example, example Express allows to specify the max size of a post request body like so:

bodyParser.json({limit:'1Mb'})

How I do something similar with the ws module?
I tried

var ws = require('ws').Server
var wsserver = new ws({port:8080, limit:'1Mb'})

But this of course doesn't work.
I want the transmission of data to be interrupted (after 1Mb is exceeded) and the websocket connection to be closed. How can I do that?
There must be a way to limit the frames of data ing from the client...

I am using the ws module and I'd like to limit the amount of data being sent by the client over websocket to 1Mb. This will prevent a malicious user from sending huge amounts of data (in terms of GB) causing the server to run out of memory, which would cause denial of service errors for every normal user.
For example, example Express allows to specify the max size of a post request body like so:

bodyParser.json({limit:'1Mb'})

How I do something similar with the ws module?
I tried

var ws = require('ws').Server
var wsserver = new ws({port:8080, limit:'1Mb'})

But this of course doesn't work.
I want the transmission of data to be interrupted (after 1Mb is exceeded) and the websocket connection to be closed. How can I do that?
There must be a way to limit the frames of data ing from the client...

• javascript
• node.js
• express
• websocket
• limit

Share Improve this question Follow edited Jun 29, 2015 at 18:15 NickSentowski 8181313 silver badges2727 bronze badges asked Jun 14, 2015 at 21:27 Core_dumpedCore_dumped 1,61144 gold badges1818 silver badges3636 bronze badges 4

• guess no one knows yet ... github./websockets/ws/issues/513 ... github./websockets/ws/issues?utf8=%E2%9C%93&q=limit – rafaelcastrocouto Commented Jun 14, 2015 at 23:47
• Which ws library are you using? If there isn't an answer in the documentation for the webSocket library you are using, then an answer can only be determined by studying the code for the library to see if it has any sort of limit capability or understanding where the code could be changed to add such a limit. It does sound like a reasonable thing to want. – jfriend00 Commented Jun 15, 2015 at 4:55
• @jfriend00 npmjs./package/ws here it is. Apparently in the documentation there is no property of the option argument which would do so. Maybe there is a method of the wsServer instance which can set the limit. I will check it out. – Core_dumped Commented Jun 15, 2015 at 7:33
• yay: github./faye/faye-websocket-node#initialization-options has maxLength – dandavis Commented Jun 23, 2015 at 21:16

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1 Answer 1

Sorted by: Reset to default 12 +25

That ability does not (currently) exist in that library.

Poking around their source code, it appears that the place to start would be processPacket() method in https://github./websockets/ws/blob/master/lib/Receiver.js .

Once you have the packet header available, you can see the size of the message being sent. If it's above a certain threshold, there should be a way to close the connection before all of the bytes are even hitting your network.

Of course, the nice thing to do would be to fork their repository, issue a feature request, add in a configuration option that defaults to not taking any action if it's not set (don't break backwards patibility), and submit a pull request.

If they like it, they'll merge. If not, you'll still be able to merge their future versions into your own repo and stay up to date without having to re-do your work each time they submit a new release.

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