ssl_get_ex_data_x509_store_ctx_idx(3)
NAME
SSL_get_ex_data_X509_STORE_CTX_idx - get ex_data index to
access SSL structure from X509_STORE_CTX
SYNOPSIS
#include <openssl/ssl.h> int SSL_get_ex_data_X509_STORE_CTX_idx(void);
DESCRIPTION
SSL_get_ex_data_X509_STORE_CTX_idx() returns the index
number under which the pointer to the SSL object is stored
into the X509_STORE_CTX object.
NOTES
Whenever a X509_STORE_CTX object is created for the veri
fication of the peers certificate during a handshake, a
pointer to the SSL object is stored into the
X509_STORE_CTX object to identify the connection affected.
To retrieve this pointer the X509_STORE_CTX_get_ex_data()
function can be used with the correct index. This index is
globally the same for all X509_STORE_CTX objects and can
be retrieved using SSL_get_ex_data_X509_STORE_CTX_idx().
The index value is set when
SSL_get_ex_data_X509_STORE_CTX_idx() is first called
either by the application program directly or indirectly
during other SSL setup functions or during the handshake.
The value depends on other index values defined for
X509_STORE_CTX objects before the SSL index is created.
RETURN VALUES
>=0 The index value to access the pointer.
- <0 An error occurred, check the error stack for a
- detailed error message.
EXAMPLES
The index returned from
SSL_get_ex_data_X509_STORE_CTX_idx() allows to access the
SSL object for the connection to be accessed during the
verify_callback() when checking the peers certificate.
Please check the example in SSL_CTX_set_verify(3),