feat: Multiple resolvers continued

pkg/resolvers/utils.go

@@ -1,11 +1,6 @@
 package resolvers
 
 import (
-	"errors"
-	"fmt"
-	"net"
-	"runtime"
-
 	"github.com/miekg/dns"
 )
 
@@ -23,26 +18,3 @@ func prepareMessages(questions []dns.Question) []dns.Msg {
 	}
 	return messages
 }
-
-func getDefaultServers() ([]string, error) {
-	if runtime.GOOS == "windows" {
-		// TODO: Add a method for reading system default nameserver in windows.
-		return nil, errors.New(`unable to read default nameservers in this machine`)
-	}
-	// if no nameserver is provided, take it from `resolv.conf`
-	cfg, err := dns.ClientConfigFromFile(DefaultResolvConfPath)
-	if err != nil {
-		return nil, err
-	}
-	servers := make([]string, 0, len(cfg.Servers))
-	for _, s := range cfg.Servers {
-		ip := net.ParseIP(s)
-		// handle IPv6
-		if ip != nil && ip.To4() != nil {
-			servers = append(servers, fmt.Sprintf("%s:%s", s, cfg.Port))
-		} else {
-			servers = append(servers, fmt.Sprintf("[%s]:%s", s, cfg.Port))
-		}
-	}
-	return servers, nil
-}