Most of artificial satellites of the Moon has depleted their batteries, lost communication, been deorbited or impacted the surface after orbital decay. The list doesn't exactly make it clear which ones are still functional and active. Could you provide the current, complete list of active lunar orbiters and what functions they fulfill?
Orbiting the moon is notoriously difficult for long periods of time. The lunar gravity field varies by as much as 1%. There has been some work to maximize the lifetime, but it hasn't been particularly successful to date. For a complete technical explanation, see this paper. The bottom line is, there are 4 orbits which one could orbit to stay for an extended period of time, namely 27º, 50º, 76º, and 86º (See also Wikipedia, Science@NASA). Given this, there aren't many satellites that are even orbiting the moon, let alone functioning. It is difficult to tell which satellites have crashed into the moon, but it is safe to say that any spacecraft orbiting from more than 20 years ago will have crashed in to the moon already.
The only known spacecraft currently orbiting the moon arethe Lunar Reconnaissance Orbiter (LRO), as well as the two ARTEMIS probes, which are functioning. Beyond that, it is unlikely that any spacecraft is still orbiting, let alone functioning. There are plans for a few more launches in the next few years, but for now, it is only these 3.