/* STARTTLS command requires CAPABILITIES... */
BIO_printf(fbio, "CAPABILITIES\r\n");
(void)BIO_flush(fbio);
- /* wait for multi-line CAPABILITIES response */
- do {
- mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
- if (strstr(mbuf, "STARTTLS"))
- foundit = 1;
- } while (mbuf_len > 1 && mbuf[0] != '.');
+ BIO_gets(fbio, mbuf, BUFSIZZ);
+ /* no point in trying to parse the CAPABILITIES response if there is none */
+ if (strstr(mbuf, "101") != NULL) {
+ /* wait for multi-line CAPABILITIES response */
+ do {
+ mbuf_len = BIO_gets(fbio, mbuf, BUFSIZZ);
+ if (strstr(mbuf, "STARTTLS"))
+ foundit = 1;
+ } while (mbuf_len > 1 && mbuf[0] != '.');
+ }
(void)BIO_flush(fbio);
BIO_pop(fbio);
BIO_free(fbio);