SSL_OP_COOKIE_EXCHANGE
SSL_set_options(con, SSL_OP_COOKIE_EXCHANGE);
SSL_set_options(ssl, SSL_OP_COOKIE_EXCHANGE);
(SSL_OP_CRYPTOPRO_TLSEXT_BUG | SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS | SSL_OP_ALLOW_CLIENT_RENEGOTIATION | SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION | SSL_OP_NO_COMPRESSION | SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1_2 | SSL_OP_NO_DTLSv1 | SSL_OP_NO_DTLSv1_2 | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_CISCO_ANYCONNECT | SSL_OP_NO_RENEGOTIATION | SSL_OP_NO_EXTENDED_MASTER_SECRET | SSL_OP_NO_ENCRYPT_THEN_MAC | SSL_OP_COOKIE_EXCHANGE | SSL_OP_LEGACY_SERVER_CONNECT | SSL_OP_IGNORE_UNEXPECTED_EOF)
if (SSL_get_options(SSL_CONNECTION_GET_SSL(s)) & SSL_OP_COOKIE_EXCHANGE) {
if (SSL_get_options(ssl) & SSL_OP_COOKIE_EXCHANGE) {
&& (SSL_get_options(SSL_CONNECTION_GET_SSL(s)) & SSL_OP_COOKIE_EXCHANGE)) {
SSL_CTX_set_options(sctx, SSL_OP_COOKIE_EXCHANGE);
SSL_CTX_set_options(sctx, SSL_OP_COOKIE_EXCHANGE);