Manual:SSL get SSL CTX(3)
SSL_get_SSL_CTX - get the SSL_CTX from which an SSL is created
#include <openssl/ssl.h> SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl);
SSL_get_SSL_CTX() returns a pointer to the SSL_CTX object, from which ssl was created with SSL_new(3).
The pointer to the SSL_CTX object is returned.