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copied!<p><code>socket()</code> returns a file descriptor if this is what you are referring to as a socket ID then the ways to get this without the process's collaboration on windows are limited. FWIW on linux open FDs are enumerated in the proc filesystem.</p> <p>That being said, the only thing you would be able to do with the fd is send additional information from the socket. You could also read from the fd, but any data read in this way would <em>not</em> be sent to the application that owns the socket. Without some coordination, that would probably not be what you desire as you would just get bits and pieces of data.</p> <p>If just want to be able to listen in on the traffic in your program, then something like packet filtering should be sufficient so I assume you actually want to be able to be like a man in the middle for it.</p> <p>If this is the case, then the best thing to do would actually be to set your application up as a proxy for your other service.</p> <p>By this I mean, write a program that opens a listening port and accepts connections when a connection is initiated, it should immediately open its own connection to a pre-configured IP:port combination and begin forwarding traffic. Once this is written it's a simple matter to inspect the traffic before forwarding and possibly modify it.</p> <p>If your program is a server, run it on a non-standard port, configure this application to open the server's normal port and then forward connections to the non-standard port you set up on localhost.</p> <p>If your program is a client, simply point the interceptor application at the server and choose a random listen port on your box. Then configure the client to connect to this listen port as though it were the server.</p> <p>This should work for pretty much anything. The only caveat is if the traffic is encrypted you will (obviously) not be able to inspect/modify it. This is effectively the same as placing your application behind a NAT.</p>

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