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POWatchdog monitoring UNIX domain socket, triggering events upon specific content
 

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    <p>I am on an embedded platform (mipsel architecture, Linux 2.6 kernel) where I need to monitor IPC between two closed-source processes (router firmware) in order to react to a certain event (dynamic IP change because of DSL reconnect). What I found out so far via <em>strace</em> is that whenever the IP changes, the DSL daemon writes a special message into a UNIX domain socket bound to a specific file name. The message is consumed by another daemon.</p> <p>Now here is my requirement: I want to monitor the data flow through that specific UNIX domain socket and trigger an event (call a shell script) if a certain message is detected. I tried to monitor the file name with inotify, but it does not work on socket files. I know I could run strace all the time, filtering its output and react to changes in the filtered log file, but that would be too heavy a solution because strace really slows down the system. I also know I could just poll for the IP address change via cron, but I want a watchdog, not a polling solution. And I am interested in finding out whether there is a tool which can specifically monitor UNIX domain sockets and react to specific messages flowing through in a predefined direction. I imagine something similar to inotifywait, i.e. the tool should wait for a certain event, then exit, so I can react to the event and loop back into starting the tool again, waiting for the next event of the same type.</p> <p>Is there any existing Linux tool capable of doing that? Or is there some simple C code for a stand-alone binary which I could compile on my platform (uClibc, not glibc)? I am not a C expert, but capable of running a makefile. Using a binary from the shell is no problem, I know enough about shell programming.</p>
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