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ssl handshake packets sniffer

The Test task

You should create a go application (go version >= 1.13) that will do the following:

  1. Run on a 64-bit Linux distribution (Centos, Ubuntu, Debian).
  2. Sniff tcp/ip packets.
  3. Detect among the sniffed packets detect SSL (https) handshake packets.
  4. Print to stdout each detection in the following format: IP_SRC,TCP_SRC,IP_DST,TCP_DST,COUNT(TCP_OPTIONS).

Alternative task

Do 4. using a websocket transport instead of stdout. This means you should create a minimal set of html/css/js code that will display the output whenever a user visits the dedicated URL.

Optional task

The app should work in Docker. Make sure you provide all the details how it would run there.

Notes:

  • COUNT(TCP_OPTIONS) is a number of TCP_OPTIONS contained in the TCP/IP packet.
  • Please do the task as clean as possible.
  • Write at least some unit-tests (hint: you can use pre-saved packets as a test data).
  • You cannot use tcpdump for this task or any other shell command.
  • The task should be published to GitHub.
  • There should be a readme file with a description on how to compile and use the app.

Usage

docker run --rm --name sniffer -p 443:443 wawan/sniffer