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Burp IProxyListener - Current message not saved

stefano0798 | Last updated: Mar 19, 2020 04:34PM UTC

Hi everyone, I'm writing my first Burp extension and I'm having some troubles with the Proxy listener interface. My aim for now is to build a plugin which shows every parameter and header of the request and print those in a text area (in a new tab) when my Context menu item is clicked. Now I implemented the IProxyListener interface and in the method processProxyManager I set the value of a byte array to the value of message.getMessageInfo().getRequest(). In this way, if I am understanding correctly, each time the Proxy intercepts a request, it updates the array with the current request's byte. My custom context menu item behaviors in this way: it gets the byte array (which is the request) and through the helper I use the getHeaders and getParameters to extract the data I am interested in. The trouble I'm having is that the request in the proxy (where I click my custom context menu item) is not the one which is shown in my tab. It seems like processProxyManager is not invoked each time a new request arrives or it skips some messages for some reason. I can post the code somewhere if it may help, and I'm sorry if I'm missing something but this is my first experience in this field. Thank you.

Hannah, PortSwigger Agent | Last updated: Mar 24, 2020 10:15AM UTC