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README.md

Challenge 23 - Write Your Own Traceroute

This challenge corresponds to the 23rd part of the Coding Challenges series by John Crickett https://codingchallenges.fyi/challenges/challenge-traceroute/.

Approach

  1. Created a DNS lookup function and added command line args support

  2. Created function that listens for ICMP packets. This part is a little tricky. In Node.js, there is no support for ICMP packets natively. Hence we have to rely on third-party packages. I went ahead and used the hotfix version of raw-socket library. There are some caveats for this old package.

    • The package does not work for Windows.
    • Moreover for Linux systems it automatically closes up. See this issue #70

  3. Created a UDP message sender. We need to ensure that the TTL is being updated along with the PORT every time this function is called.

  4. Created a function that handles the timeout condition and logs relevant details when an ICMP packet is received.

Usage

You can use the ts-node tool to run the DNS resolver as follows:

npx ts-node traceroute.ts <host>