dns-resolver

A simple implementation of DNS resolver in Golang

Steps:

• Setup base server that takes in domain name as argument to process remaining things
• Build Header for the Query Message
• Send request to a name server and check the response
• Parse the Response we received from the name server and log it properly
  • Parse Headers
  • Parse Question
  • Parse Answer
• Handle Authority Record
• Handle Additional Record
• Format the complete response in Human Readable
• Query Root Name server to get the Name server for any domain
• Query for multiple types of requests such as A, CNAME, AA, MX, etc. records

Usage:

go run cmd/main.go google.com -t A

This resolves the ip address of google.com

To see all the request made and complete dns response, add the verbose flag

go run cmd/main.go google.com -t A -v