In short: in search for a library (or techniques) for capturing http/https/ftp traffic. To be used with C#/Mono or Java, needs to run on Windows/Mac/Linux.
The long story: For a given usecase I need to log network traffic (basic from IP to IP does not suffice, I need the actual requests). The method(s) used are fired every 5 seconds to scan for given network activity on the system, and then logs this to file/server/... What I'm after is a library that can output the traffic for each major platform (Windows, Linux, Mac). Current codebase is C# on Mono, but I'm open to switch to Java if need be. I'm also willing to get libraries for each OS seperately, it doesn't have to be one-to-rule-them-all - but currently I haven't been able to see a library or tehcnique that can pull the information out for Linux or Mac - Windows is no problem so far.
If you want to develop your program using Java Jpcap would be a nice solution. Its capabilities are comparable to those of the well-known libpcap.