FEAT: Refactor allowing multiple DNS Providers

internal/dns_resolver/dns_resolver.go

@@ -0,0 +1,29 @@
+package dns_resolver
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"time"
+)
+
+func ResolveHostname(host string, dns_resolver_ip string) net.IP {
+	r := &net.Resolver{
+		PreferGo: true,
+		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			d := net.Dialer{
+				Timeout: time.Millisecond * time.Duration(10000),
+			}
+			return d.DialContext(ctx, network, dns_resolver_ip+":53")
+		},
+	}
+
+	ips, err := r.LookupHost(context.Background(), host)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Could not get IPs: %v\n", err)
+		os.Exit(1)
+	}
+
+	return net.ParseIP(ips[len(ips)-1])
+}