sasl_checkpass(3) -- Linux man page
NAMEsasl_checkpass - Check a plaintext password
#include <sasl/sasl.h> int sasl_checkpass(sasl_conn_t *conn, const char *user, unsigned userlen, const char *pass, unsigned passlen);
sasl_checkpass() will check a plaintext password. This is needed for protocols that had a login method before SASL (for example the LOGIN command in IMAP). The password is checked with the pwcheck_method See sasl_callbacks(3) for information on how this parameter is set.
RETURN VALUEsasl_checkpass returns an integer which corresponds to one of the following codes. SASL_OK indicates that the authentication is complete. All other return codes indicate errors and should either be handled or the authentication session should be quit. See sasl_errors(3) for meanings of return codes.
CONFORMING TORFC 2222
SEE ALSOsasl(3), sasl_errors(3), sasl_callbacks(3), sasl_setpass(3)