73 lines
2.2 KiB
Text
73 lines
2.2 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_get_session - retrieve TLS/SSL session data
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ssl.h>
|
|
|
|
SSL_SESSION *SSL_get_session(const SSL *ssl);
|
|
SSL_SESSION *SSL_get0_session(const SSL *ssl);
|
|
SSL_SESSION *SSL_get1_session(SSL *ssl);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
SSL_get_session() returns a pointer to the B<SSL_SESSION> actually used in
|
|
B<ssl>. The reference count of the B<SSL_SESSION> is not incremented, so
|
|
that the pointer can become invalid by other operations.
|
|
|
|
SSL_get0_session() is the same as SSL_get_session().
|
|
|
|
SSL_get1_session() is the same as SSL_get_session(), but the reference
|
|
count of the B<SSL_SESSION> is incremented by one.
|
|
|
|
=head1 NOTES
|
|
|
|
The ssl session contains all information required to re-establish the
|
|
connection without a new handshake.
|
|
|
|
SSL_get0_session() returns a pointer to the actual session. As the
|
|
reference counter is not incremented, the pointer is only valid while
|
|
the connection is in use. If L<SSL_clear(3)|SSL_clear(3)> or
|
|
L<SSL_free(3)|SSL_free(3)> is called, the session may be removed completely
|
|
(if considered bad), and the pointer obtained will become invalid. Even
|
|
if the session is valid, it can be removed at any time due to timeout
|
|
during L<SSL_CTX_flush_sessions(3)|SSL_CTX_flush_sessions(3)>.
|
|
|
|
If the data is to be kept, SSL_get1_session() will increment the reference
|
|
count, so that the session will not be implicitly removed by other operations
|
|
but stays in memory. In order to remove the session
|
|
L<SSL_SESSION_free(3)|SSL_SESSION_free(3)> must be explicitly called once
|
|
to decrement the reference count again.
|
|
|
|
SSL_SESSION objects keep internal link information about the session cache
|
|
list, when being inserted into one SSL_CTX object's session cache.
|
|
One SSL_SESSION object, regardless of its reference count, must therefore
|
|
only be used with one SSL_CTX object (and the SSL objects created
|
|
from this SSL_CTX object).
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
The following return values can occur:
|
|
|
|
=over 4
|
|
|
|
=item NULL
|
|
|
|
There is no session available in B<ssl>.
|
|
|
|
=item Pointer to an SSL
|
|
|
|
The return value points to the data of an SSL session.
|
|
|
|
=back
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(3)|ssl(3)>, L<SSL_free(3)|SSL_free(3)>,
|
|
L<SSL_clear(3)|SSL_clear(3)>,
|
|
L<SSL_SESSION_free(3)|SSL_SESSION_free(3)>
|
|
|
|
=cut
|