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main_repo / deps / openssl / openssl / doc / ssl / d2i_SSL_SESSION.pod @ aa3b4b4d
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=pod |
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=head1 NAME |
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d2i_SSL_SESSION, i2d_SSL_SESSION - convert SSL_SESSION object from/to ASN1 representation |
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=head1 SYNOPSIS |
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#include <openssl/ssl.h> |
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SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length); |
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int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp); |
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=head1 DESCRIPTION |
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d2i_SSL_SESSION() transforms the external ASN1 representation of an SSL/TLS |
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session, stored as binary data at location B<pp> with length B<length>, into |
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an SSL_SESSION object. |
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|
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i2d_SSL_SESSION() transforms the SSL_SESSION object B<in> into the ASN1 |
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representation and stores it into the memory location pointed to by B<pp>. |
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The length of the resulting ASN1 representation is returned. If B<pp> is |
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the NULL pointer, only the length is calculated and returned. |
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=head1 NOTES |
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The SSL_SESSION object is built from several malloc()ed parts, it can |
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therefore not be moved, copied or stored directly. In order to store |
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session data on disk or into a database, it must be transformed into |
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a binary ASN1 representation. |
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When using d2i_SSL_SESSION(), the SSL_SESSION object is automatically |
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allocated. The reference count is 1, so that the session must be |
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explicitly removed using L<SSL_SESSION_free(3)|SSL_SESSION_free(3)>, |
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unless the SSL_SESSION object is completely taken over, when being called |
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inside the get_session_cb() (see |
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L<SSL_CTX_sess_set_get_cb(3)|SSL_CTX_sess_set_get_cb(3)>). |
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|
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SSL_SESSION objects keep internal link information about the session cache |
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list, when being inserted into one SSL_CTX object's session cache. |
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One SSL_SESSION object, regardless of its reference count, must therefore |
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only be used with one SSL_CTX object (and the SSL objects created |
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from this SSL_CTX object). |
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When using i2d_SSL_SESSION(), the memory location pointed to by B<pp> must be |
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large enough to hold the binary representation of the session. There is no |
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known limit on the size of the created ASN1 representation, so the necessary |
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amount of space should be obtained by first calling i2d_SSL_SESSION() with |
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B<pp=NULL>, and obtain the size needed, then allocate the memory and |
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call i2d_SSL_SESSION() again. |
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Note that this will advance the value contained in B<*pp> so it is necessary |
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to save a copy of the original allocation. |
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For example: |
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int i,j; |
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char *p, *temp; |
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i = i2d_SSL_SESSION(sess, NULL); |
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p = temp = malloc(i); |
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j = i2d_SSL_SESSION(sess, &temp); |
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assert(i == j); |
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assert(p+i == temp); |
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=head1 RETURN VALUES |
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d2i_SSL_SESSION() returns a pointer to the newly allocated SSL_SESSION |
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object. In case of failure the NULL-pointer is returned and the error message |
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can be retrieved from the error stack. |
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|
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i2d_SSL_SESSION() returns the size of the ASN1 representation in bytes. |
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When the session is not valid, B<0> is returned and no operation is performed. |
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=head1 SEE ALSO |
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|
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L<ssl(3)|ssl(3)>, L<SSL_SESSION_free(3)|SSL_SESSION_free(3)>, |
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L<SSL_CTX_sess_set_get_cb(3)|SSL_CTX_sess_set_get_cb(3)> |
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=cut |