cli.go

@@ -186,7 +186,7 @@ func parseArgs(args []string) (util.Answers, error) {
 			// TODO: Actually find where windows stuffs its dns resolvers
 			resp.Answers.Server = "8.8.4.4"
 		} else {
-			resp.Answers.Server = resolv.Servers[rand.Intn(len(resolv.Servers))]
+			resp.Answers.Server = resolv.Servers[rand.Intn(len(resolv.Servers)-1)]
 		}
 	}
 

util/dns.go

@@ -0,0 +1,47 @@
+package util
+
+import (
+	"encoding/base64"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/miekg/dns"
+)
+
+func ResolveHTTPS(msg *dns.Msg, server string) (*dns.Msg, error) {
+	httpR := &http.Client{}
+	buf, err := msg.Pack()
+	if err != nil {
+		return nil, err
+	}
+	query := server + "?dns=" + base64.RawURLEncoding.EncodeToString(buf)
+	req, err := http.NewRequest("GET", query, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Accept", "application/dns-message")
+
+	res, err := httpR.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("bad HTTP Request: %d", res.StatusCode)
+	}
+
+	fullRes, err := io.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+	response := dns.Msg{}
+	err = response.Unpack(fullRes)
+	if err != nil {
+		return nil, err
+	}
+
+	return &response, nil
+
+}