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    <p>It has been a while since I was dealing with this topic and did not actually get around to testing what an acquaintance of mine, <strong>Denys Vlasenko</strong>, maintainer of Busybox, proposed as a solution to me several months ago. Because I just checked my account here on StackOverflow and saw the question again, let me share his insights with you. Maybe it is helpful for somebody:</p> <blockquote> <p>One relatively easy hack I can propose is to do the following:</p> <p>I assume that you have a running server app which opened a Unix domain listening socket (say, <code>/tmp/some.socket</code>), and client programs connect to it and talk to the server.</p> <ul> <li>rename <code>/tmp/some.socket</code> -> <code>/tmp/some.socket1</code></li> <li>create a new socket /tmp/some.socket</li> <li>listen on it for new client connections</li> <li>for every such connection, open another connection to <code>/tmp/some.socket1</code> to original server process</li> <li>pump data (client&lt;->server) over resulting pairs of sockets (code to do so is very similar to what telnetd server does) until EOF from either side.</li> </ul> <p>While you are pumping data, it's easy to look at it, to save it, and even to modify it if you need to.</p> <p>The downside is that this sniffer program needs to be restarted every time the original server program is restarted.</p> </blockquote> <p>This is similar to what <strong>Celada</strong> also answered. Thanks to him as well! Denys's answer was a bit more concrete, though.</p> <p>I asked back:</p> <blockquote> <p>This sounds hacky, yes, because of the restart necessity, but feasible. Me not being a C programmer, I keep wondering though if you know a command line tool which could do the pass-through and protocolling or event-based triggering work for me. I have one guy from our project in mind who could hack a little C binary for that, but I am unsure if he likes to do it. If there is something pre-fab, I would prefer it. Can it even be done with a (combination of) BusyBox applet(s), maybe?</p> </blockquote> <p>Denys answered again:</p> <blockquote> <p>You need to build busybox with <code>CONFIG_FEATURE_UNIX_LOCAL=y</code>.</p> <p>Run the following as intercepting server:</p> <pre><code> busybox tcpsvd -vvvE local:/tmp/socket 0 ./script.sh </code></pre> <p>Where script.sh is a simple passthrough connection to the "original server":</p> <pre><code> #!/bin/sh busybox nc -o /tmp/hexdump.$$ local:/tmp/socket1 0 </code></pre> <p>As an example, I added hex logging to file (<code>-o FILE</code> option).</p> <p>Test it by running an emulated "original server":</p> <pre><code> busybox tcpsvd -vvvE local:/tmp/socket1 0 sh -c 'echo PID:$$' </code></pre> <p>and by connecting to "intercepting server":</p> <pre><code> echo Hello world | busybox nc local:/tmp/socket 0 </code></pre> <p>You should see "PID:19094" message and have a new <code>/tmp/hexdump.19093</code> file with the dumped data. Both tcpsvd processes should print some log too (they are run with <code>-vvv</code> verbosity).</p> <p>If you need more complex processing, replace nc invocation in <code>script.sh</code> with a custom program.</p> </blockquote>
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