Mastering Go - Second Edition

Getting the NS records of a domain

A very popular DNS request has to do with finding out the name servers of a domain, which are stored in the NS records of that domain. This functionality will be illustrated in the code for NSrecords.go.

The code for NSrecords.go will be presented in two parts.

The first part of NSrecords.go is as follows:

package main 
 
import ( 
    "fmt" 
    "net" 
    "os" 
) 
 
func main() { 
    arguments := os.Args 
    if len(arguments) == 1 { 
        fmt.Println("Need a domain name!") 
        return 
    } 

In this part, you check whether you have at least one command-line argument in order to have something with which you can work.

The remaining Go code for NSrecords.go is as follows:

 domain := arguments[1] NSs, err := net.LookupNS(domain) if err != nil { fmt.Println(err) ...