#include <sasl/sasl.h>
int sasl_chalprompt_t(void *context, int id, 
                          const char *challenge,
                      const char *prompt, const char *defresult,
                      const char **result, unsigned *len)
 
sasl_chalprompt_t is used to prompt for input in response to a server challenge.
context context from the callback record
id callback id (either SASL_CB_ECHOPROMPT or SASL_CB_NOECHOPROMPT)
challenge the server's challenge
prompt A prompt for the user
defresult Default result (may be NULL)
result The user's response (a NUL terminated string)
len Length of the user's response.