SimpleSniffer and Apple's Easter Egg in the PCAP Data

Last year when analyzing raw PCAP-NG data from Yosemite, I noticed Apple embedded application name data in the PCAP data. The PCAP-NG format lets vendors create their own extensions to the data, and I thought Apple created a clever and handy extension. Last month I finally sat down to start learning Swift, so I did what I usually do when learning a new language - I wrote a network analyzer.