chore: better dns log

dns/client.go

@@ -25,6 +25,26 @@ type client struct {
 	host         string
 	iface        *atomic.String
 	proxyAdapter string
+	addr         string
+}
+
+var _ dnsClient = (*client)(nil)
+
+// Address implements dnsClient
+func (c *client) Address() string {
+	if len(c.addr) != 0 {
+		return c.addr
+	}
+	schema := "udp"
+	if strings.HasPrefix(c.Client.Net, "tcp") {
+		schema = "tcp"
+		if strings.HasSuffix(c.Client.Net, "tls") {
+			schema = "tls"
+		}
+	}
+
+	c.addr = fmt.Sprintf("%s//:%s", schema, net.JoinHostPort(c.host, c.port))
+	return c.addr
 }
 
 func (c *client) Exchange(m *D.Msg) (*D.Msg, error) {