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gnutls_session_get_id2(3)	    gnutls	     gnutls_session_get_id2(3)


NAME

       gnutls_session_get_id2 - API function


SYNOPSIS

       #include <gnutls/gnutls.h>

       int  gnutls_session_get_id2(gnutls_session_t  session, gnutls_datum_t *
       session_id);


ARGUMENTS

       gnutls_session_t session
		   is a gnutls_session_t type.

       gnutls_datum_t * session_id
		   will point to the session ID.


DESCRIPTION

       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  resump-
       tion.   In  server side this function is guaranteed to return a persis-
       tent identifier of the session since GnuTLS 3.6.4, which may not neces-
       sarily  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

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


SINCE

       3.1.4


REPORTING BUGS

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


COPYRIGHT

       Copyright (C) 2001-2018 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

       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

       http://www.gnutls.org/manual/

gnutls				     3.6.5	     gnutls_session_get_id2(3)

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