typedef gboolean(* VortexSaslAuthPlain)(VortexConnection *connection, const gchar *auth_id, const gchar *authorization_id, const gchar *password)

Asynchronous notification to enable user space code to validate SASL PLAIN request received.

Function using this handler are:

connection The connection where the SASL notification was received.
auth_id User identifier
authorization_id User identifier which is acting on behalf of.
password Current user password
TRUE to accept incoming SASL request or FALSE to deny it.