1 files changed, 30 insertions, 0 deletions
diff --git a/internal/dns/rr_mx.go b/internal/dns/rr_mx.go
new file mode 100644
index 0000000..2f49f86
--- /dev/null
+++ b/internal/dns/rr_mx.go
@@ -0,0 +1,30 @@
+package dns
+
+import "fmt"
+
+// https://datatracker.ietf.org/doc/html/rfc1035#section-3.3.9
+type MX struct {
+	Pref uint16
+	Mx   Name
+}
+
+func (mx *MX) Type() uint16 { return TypeMX }
+
+func (mx *MX) Pack(p *packer) error {
+	p.writeUint16(mx.Pref)
+	return p.writeName(mx.Mx)
+}
+
+func (mx *MX) Unpack(u *unpacker, length uint16) error {
+	var err error
+	mx.Pref, err = u.readUint16()
+	if err != nil {
+		return err
+	}
+	mx.Mx, err = u.readName()
+	return err
+}
+
+func (mx *MX) String() string {
+	return fmt.Sprintf("%d %s", mx.Pref, mx.Mx.String())
+}