Asynchronous notification to enable user space to accept or deny anonymous authentication for SASL ANONYMOUS profile.
Function using this definition:
|connection ||The connection where the anonymous request was received.|
|anonymous_token ||The anonymous token provided by the remote client side. You must not modify or deallocate this value.|
|user_data ||The user defined pointer to be passed to future SASL callbacks|
- axl_true to validate the incoming anonymous auth request. axl_false to deny it.