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Pinger CLI Application

Short description

This is a pinger application, which can ping IPv4 addresses and has limited support for IPv6. Additionally, you can set TTL (Time to Live) (Please, refer to options).

Usage

  1. Install Golang in any way you like.
  2. Install Git.
  3. Clone this repository.
  4. cd into repository.
  5. Run go build.
  6. Run sudo ./binary_name -t 70 example.com

Synopsis

  • sudo ./binary_name [options] destination
  • destination can be hostname or literal IPv4/IPv6 address

Options

  • -t ttl Set the IP Time to Live.
  • -6 Set the IP version to IPv6. NOTE: You do not need to set this option, if you provide literal IPv6 address. NOTE: As I only have Link-Local IPv6 address, I had hard times getting a public one. So even though I implemented IPv6 functionality, I couldn't test it. Thus, it may not work.

Example Screenshots

Normal Run Specified TTL is too low

Technical details

  • This app uses privileged sockets for simplicity, thus the use of sudo is needed.
  • The pinger is based on stop-and-wait principle. This means, we send the ICMP echo request and then wait for echo reply before sending another message. This approach helps to simply reason about the behaviour and adds possibility of representing the pinger as the state machine.