SASL_AUTH_EXTERNAL
SASL_AUTH_EXTERNAL,
result = sasl_setprop(*conn, SASL_AUTH_EXTERNAL, auth_id);
(sasl_setprop(conn, SASL_AUTH_EXTERNAL,
saslresult = sasl_setprop(mci->mci_conn, SASL_AUTH_EXTERNAL, auth_id);
case SASL_AUTH_EXTERNAL:
case SASL_AUTH_EXTERNAL: