I am not getting any SCTs when using OpenSSL. After setting up the SSL connection, I'm calling
SSL_enable_ct(ssl, SSL_CT_VALIDATION_PERMISSIVE);
const STACK_OF(SCT) *sct_stack = sk_SCT_new_null();
sct_stack = SSL_get0_peer_scts(ssl);
printf("%i SCTs obtained.\n", sk_SCT_num(sct_stack));
And it always prints out that I obtained 0 SCTs, regardless of the domain that I connect to. The thing is, the connection is being setup correctly, because I can grab the X509 certificate for any domain I connect to, and I can send OCSP requests and obtain responses to those requests. But when I try to grab the SCTs that should be sent, my code always informs me that there were no SCTs.
I have a strong feeling that it is my code that isn't working, because even when I connect to one of google's websites, such as google.com or gmail.com, I am unable to obtain any SCTs from the connection, despite the fact that Google pioneered certificate transparency.