08-31-2010
If it is a random number from the index, you can identify it.
If the index is unknown, what do you know then - the string?
I think both can be handled with the example.
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LEARN ABOUT LINUX
ssl_get_ex_data_x509_store_ctx_idx
SSL_get_ex_data_X509_STORE_CTX_idx(3SSL) OpenSSL SSL_get_ex_data_X509_STORE_CTX_idx(3SSL)
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 verification 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),
SEE ALSO
ssl(3), SSL_CTX_set_verify(3), CRYPTO_set_ex_data(3)
1.0.0e 2001-01-20 SSL_get_ex_data_X509_STORE_CTX_idx(3SSL)