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avformat/tls_openssl: force dtls handshake to be blocking

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There is no sensible way to handle this otherwise anyway, one just has
to loop over this function until it succeeds.
This commit is contained in:
Timo Rothenpieler
2025-07-12 22:06:33 +02:00
parent 87b09f3931
commit 951013e603
1 changed files with 12 additions and 6 deletions
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18
libavformat/tls_openssl.c
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@ -685,27 +685,33 @@ static int openssl_dtls_verify_callback(int preverify_ok, X509_STORE_CTX *ctx)
static int dtls_handshake(URLContext *h)
{
int ret = 0, r0, r1;
int ret = 1, r0, r1;
TLSContext *p = h->priv_data;
int was_nonblock = h->flags & AVIO_FLAG_NONBLOCK;
h->flags &= ~AVIO_FLAG_NONBLOCK;
r0 = SSL_do_handshake(p->ssl);
r1 = SSL_get_error(p->ssl, r0);
if (r0 <= 0) {
r1 = SSL_get_error(p->ssl, r0);
if (r1 != SSL_ERROR_WANT_READ && r1 != SSL_ERROR_WANT_WRITE && r1 != SSL_ERROR_ZERO_RETURN) {
av_log(p, AV_LOG_ERROR, "TLS: Read failed, r0=%d, r1=%d %s\n", r0, r1, openssl_get_error(p));
ret = AVERROR(EIO);
av_log(p, AV_LOG_ERROR, "Handshake failed, r0=%d, r1=%d\n", r0, r1);
ret = print_ssl_error(h, r0);
goto end;
}
} else {
av_log(p, AV_LOG_TRACE, "TLS: Read %d bytes, r0=%d, r1=%d\n", r0, r0, r1);
av_log(p, AV_LOG_TRACE, "Handshake success, r0=%d\n", r0);
}
/* Check whether the DTLS is completed. */
if (SSL_is_init_finished(p->ssl) != 1)
goto end;
ret = 0;
p->tls_shared.state = DTLS_STATE_FINISHED;
end:
if (was_nonblock)
h->flags |= AVIO_FLAG_NONBLOCK;
return ret;
}