mirror of
https://github.com/openssl/openssl.git
synced 2024-12-16 13:33:49 +08:00
fc1d88f02f
298 424 656 882 939 1630 1807 2263 2294 2311 2424 2623
2637 2686 2697 2921 2922 2940 3055 3112 3156 3177 3277
77 lines
2.8 KiB
Plaintext
77 lines
2.8 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
d2i_SSL_SESSION, i2d_SSL_SESSION - convert SSL_SESSION object from/to ASN1 representation
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ssl.h>
|
|
|
|
SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length);
|
|
int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
d2i_SSL_SESSION() transforms the external ASN1 representation of an SSL/TLS
|
|
session, stored as binary data at location B<pp> with length B<length>, into
|
|
an SSL_SESSION object.
|
|
|
|
i2d_SSL_SESSION() transforms the SSL_SESSION object B<in> into the ASN1
|
|
representation and stores it into the memory location pointed to by B<pp>.
|
|
The length of the resulting ASN1 representation is returned. If B<pp> is
|
|
the NULL pointer, only the length is calculated and returned.
|
|
|
|
=head1 NOTES
|
|
|
|
The SSL_SESSION object is built from several malloc()ed parts, it can
|
|
therefore not be moved, copied or stored directly. In order to store
|
|
session data on disk or into a database, it must be transformed into
|
|
a binary ASN1 representation.
|
|
|
|
When using d2i_SSL_SESSION(), the SSL_SESSION object is automatically
|
|
allocated. The reference count is 1, so that the session must be
|
|
explicitly removed using L<SSL_SESSION_free(3)|SSL_SESSION_free(3)>,
|
|
unless the SSL_SESSION object is completely taken over, when being called
|
|
inside the get_session_cb() (see
|
|
L<SSL_CTX_sess_set_get_cb(3)|SSL_CTX_sess_set_get_cb(3)>).
|
|
|
|
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).
|
|
|
|
When using i2d_SSL_SESSION(), the memory location pointed to by B<pp> must be
|
|
large enough to hold the binary representation of the session. There is no
|
|
known limit on the size of the created ASN1 representation, so the necessary
|
|
amount of space should be obtained by first calling i2d_SSL_SESSION() with
|
|
B<pp=NULL>, and obtain the size needed, then allocate the memory and
|
|
call i2d_SSL_SESSION() again.
|
|
Note that this will advance the value contained in B<*pp> so it is necessary
|
|
to save a copy of the original allocation.
|
|
For example:
|
|
int i,j;
|
|
char *p, *temp;
|
|
i = i2d_SSL_SESSION(sess, NULL);
|
|
p = temp = malloc(i);
|
|
j = i2d_SSL_SESSION(sess, &temp);
|
|
assert(i == j);
|
|
assert(p+i == temp);
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
d2i_SSL_SESSION() returns a pointer to the newly allocated SSL_SESSION
|
|
object. In case of failure the NULL-pointer is returned and the error message
|
|
can be retrieved from the error stack.
|
|
|
|
i2d_SSL_SESSION() returns the size of the ASN1 representation in bytes.
|
|
When the session is not valid, B<0> is returned and no operation is performed.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(3)|ssl(3)>, L<SSL_SESSION_free(3)|SSL_SESSION_free(3)>,
|
|
L<SSL_CTX_sess_set_get_cb(3)|SSL_CTX_sess_set_get_cb(3)>
|
|
|
|
=cut
|