Fix processing domain address in packet

transport/trojan/protocol.go

@@ -131,7 +131,11 @@ func (c *ClientPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error)
 		return
 	}
 	n = buffer.Len()
-	addr = destination.UDPAddr()
+	if destination.IsFqdn() {
+		addr = destination
+	} else {
+		addr = destination.UDPAddr()
+	}
 	return
 }