Do53 and DoH (POST) basic queries implemented

internal/protocols/do53/do53.go

@@ -0,0 +1,63 @@
+package do53
+
+import (
+	"fmt"
+	"net"
+
+	"golang.org/x/net/dns/dnsmessage"
+)
+
+func Run(domain, queryType, dest string, dnssec bool) error {
+
+	message, err := MakeDNSMessage(domain, queryType)
+	if err != nil {
+		return err
+	}
+
+	udpAddr, err := net.ResolveUDPAddr("udp", dest)
+	if err != nil {
+		return fmt.Errorf("failed to resolve UDP address: %v", err)
+	}
+
+	udpConn, err := net.DialUDP("udp", nil, udpAddr)
+	if err != nil {
+		return fmt.Errorf("failed to dial UDP connection: %v", err)
+	}
+	defer udpConn.Close()
+
+	_, err = udpConn.Write(message)
+	if err != nil {
+		return fmt.Errorf("failed to send DNS query: %v", err)
+	}
+
+	buf := make([]byte, 4096)
+	n, err := udpConn.Read(buf)
+	if err != nil {
+		return fmt.Errorf("failed to read DNS response: %v", err)
+	}
+
+	var parser dnsmessage.Parser
+	_, err = parser.Start(buf[:n])
+	if err != nil {
+		return fmt.Errorf("failed to parse DNS response: %v", err)
+	}
+
+	// TODO: Check if the response had no errors or TD bit set
+
+	err = parser.SkipAllQuestions()
+	if err != nil {
+		return fmt.Errorf("failed to skip questions: %v", err)
+	}
+
+	answers, err := parser.AllAnswers()
+	if err != nil {
+		return err
+	}
+
+	for _, answer := range answers {
+		fmt.Println(answer.GoString())
+	}
+
+	return nil
+}
+