gnutls_session_get_id2(3) — Linux manual page


gnutls_session_get_id2(3)          gnutls          gnutls_session_get_id2(3)

NAME         top

       gnutls_session_get_id2 - API function

SYNOPSIS         top

       #include <gnutls/gnutls.h>

       int gnutls_session_get_id2(gnutls_session_t session, gnutls_datum_t *

ARGUMENTS         top

       gnutls_session_t session
                   is a gnutls_session_t type.

       gnutls_datum_t * session_id
                   will point to the session ID.

DESCRIPTION         top

       Returns the TLS session identifier. The session ID is selected by the
       server, and in older versions of TLS was a unique identifier shared
       between client and server which was persistent across resumption.  In
       the latest version of TLS (1.3) or TLS 1.2 with session tickets, the
       notion of session identifiers is undefined and cannot be relied for
       uniquely identifying sessions across client and server.

       In client side this function returns the identifier returned by the
       server, and cannot be assumed to have any relation to session
       resumption.  In server side this function is guaranteed to return a
       persistent identifier of the session since GnuTLS 3.6.4, which may
       not necessarily map into the TLS session ID value. Prior to that
       version the value could only be considered a persistent identifier,
       under TLS1.2 or earlier and when no session tickets were in use.

       The session identifier value returned is always less than
       GNUTLS_MAX_SESSION_ID_SIZE and should be treated as constant.

RETURNS         top

       On success, GNUTLS_E_SUCCESS (0) is returned, otherwise an error code
       is returned.

SINCE         top


REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2019 Free Software Foundation, Inc., and others.
       Copying and distribution of this file, with or without modification,
       are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO         top

       The full documentation for gnutls is maintained as a Texinfo manual.
       If the /usr/share/doc/gnutls/ directory does not contain the HTML
       form visit 

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       tarball gnutls-3.6.9.tar.xz fetched from
       ⟨⟩ on 2020-09-18.  If you discover
       any rendering problems in this HTML version of the page, or you
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gnutls                              3.6.9          gnutls_session_get_id2(3)