+#ifdef SLAP_STARTTLS_ASYNCHRONOUS
+ /*
+ * use asynchronous StartTLS
+ * in case, chase referral (not implemented yet)
+ */
+ int msgid;
+
+ rs->sr_err = ldap_start_tls( ld, NULL, NULL, &msgid );
+ if ( rs->sr_err == LDAP_SUCCESS ) {
+ LDAPMessage *res = NULL;
+ int rc, retries = 1;
+ struct timeval tv = { 0, 0 };
+
+retry:;
+ rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
+ if ( rc < 0 ) {
+ rs->sr_err = LDAP_OTHER;
+
+ } else if ( rc == 0 ) {
+ if ( retries ) {
+ retries--;
+ tv.tv_sec = 0;
+ tv.tv_usec = 100000;
+ goto retry;
+ }
+ rs->sr_err = LDAP_OTHER;
+
+ } else if ( rc == LDAP_RES_EXTENDED ) {
+ struct berval *data = NULL;
+
+ rs->sr_err = ldap_parse_extended_result( ld, res,
+ NULL, &data, 0 );
+ if ( rs->sr_err == LDAP_SUCCESS ) {
+ rs->sr_err = ldap_result2error( ld, res, 1 );
+ res = NULL;
+
+ /* FIXME: in case a referral
+ * is returned, should we try
+ * using it instead of the
+ * configured URI? */
+ if ( rs->sr_err == LDAP_SUCCESS ) {
+ ldap_install_tls( ld );
+
+ } else if ( rs->sr_err == LDAP_REFERRAL ) {
+ rs->sr_err = LDAP_OTHER;
+ rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
+ }
+
+ if ( data ) {
+ if ( data->bv_val ) {
+ ber_memfree( data->bv_val );
+ }
+ ber_memfree( data );
+ }
+ }
+
+ } else {
+ rs->sr_err = LDAP_OTHER;
+ }
+
+ if ( res != NULL ) {
+ ldap_msgfree( res );
+ }
+ }
+#else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
+ /*
+ * use synchronous StartTLS
+ */
+ rs->sr_err = ldap_start_tls_s( ld, NULL, NULL );
+#endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
+