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gnutls_session_get_id2(3) — Linux manual page

gnutls_session_get_id2(3)         gnutlsgnutls_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_tsession,gnutls_datum_t *session_id);

ARGUMENTS        top

       gnutls_session_t session                   is agnutls_session_ttype.       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 thanGNUTLS_MAX_SESSION_ID_SIZEand should be treated as constant.

RETURNS        top

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

SINCE        top

       3.1.4

REPORTING BUGS        top

       Report bugs to <bugs@gnutls.org>.       Home page:https://www.gnutls.org

COPYRIGHT        top

       Copyright © 2001-2023 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 forgnutlsis maintained as a Texinfo       manual.  If the /usr/share/doc/gnutls/ directory does not contain       the HTML form visithttps://www.gnutls.org/manual/

COLOPHON        top

       This page is part of theGnuTLS (GnuTLS Transport Layer Security       Library) project.  Information about the project can be found at       ⟨http://www.gnutls.org/⟩.  If you have a bug report for this       manual page, send it to bugs@gnutls.org.  This page was obtained       from the tarball fetched from       ⟨https://www.gnupg.org/ftp/gcrypt/gnutls/⟩ on 2025-08-11.  If you       discover any rendering problems in this HTML version of the page,       or you believe there is a better or more up-to-date source for the       page, or you have corrections or improvements to the information       in this COLOPHON (which isnot part of the original manual page),       send a mail to man-pages@man7.orggnutls                            3.8.10gnutls_session_get_id2(3)

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