SSL_CTX_set_options
SSL_CTX_set_options(ctx, SSL_OP_ALL | s_client_config.off);
SSL_CTX_set_options(ctx, s_client_config.off);
SSL_CTX_set_options(ctx, SSL_OP_ALL);
SSL_CTX_set_options(ctx, s_server_config.off);
SSL_CTX_set_options(ctx2, SSL_OP_ALL);
SSL_CTX_set_options(ctx2, s_server_config.off);
SSL_CTX_set_options(tm_ctx, SSL_OP_ALL);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv2);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv3);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_1);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_2);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TLSv1_3);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
SSL_CTX_set_options(*ssl_ctx, SSL_OP_NO_CLIENT_RENEGOTIATION);
SSL_CTX_set_options(*ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
SSL_CTX_set_options(ctx, ssl_ctx_options);