How to Specify a Custom DNS Server for DNS Lookups in Go?

Lookup Function Alternatives in Golang for Custom DNS Server Specification

The Go standard library does not currently offer a function similar to LookupTXT(name, dnsServer) that allows users to specify a custom DNS server when performing DNS lookups. The Lookup*. functions available in the standard library solely rely on the configuration provided in /etc/resolv.conf.

If you require the flexibility of specifying a custom DNS server, consider utilizing third-party libraries such as github.com/miekg/dns. This library provides a lightweight and comprehensive set of functions for performing DNS lookups, including the ability to specify a custom DNS server. An example of using github.com/miekg/dns to perform a DNS lookup with a custom DNS server is provided below:

import (
    "log"

    "github.com/miekg/dns"
)

func main() {
    target := "microsoft.com"
    server := "8.8.8.8"

    c := dns.Client{}
    m := dns.Msg{}
    m.SetQuestion(target+".", dns.TypeA)
    r, t, err := c.Exchange(&m, server+":53")
    if err != nil {
        log.Fatal(err)
    }
    log.Printf("Took %v", t)
    if len(r.Answer) == 0 {
        log.Fatal("No results")
    }
    for _, ans := range r.Answer {
        Arecord := ans.(*dns.A)
        log.Printf("%s", Arecord.A)
    }
}

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