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NAME

       gnutls_ia_set_client_avp_function - API function

SYNOPSIS

       #include <gnutls/extra.h>

       void         gnutls_ia_set_client_avp_function(gnutls_ia_client_credentials_t        cred,
       gnutls_ia_avp_func avp_func);

ARGUMENTS

       gnutls_ia_client_credentials_t cred
                   is a gnutls_ia_client_credentials_t structure.

       gnutls_ia_avp_func avp_func
                   is the callback function

DESCRIPTION

       Set the TLS/IA AVP callback handler used for the session.

       The AVP callback is called to process AVPs received from the server, and to get a new  AVP
       to send to the server.

       The  callback's  function  form  is: int (*avp_func) (gnutls_session_t session, void *ptr,
       const char *last, size_t lastlen, char **next, size_t *nextlen);

       The session parameter is the  gnutls_session_t  structure  corresponding  to  the  current
       session.    The   ptr   parameter   is   the   application   hook   pointer,  set  through
       gnutls_ia_set_client_avp_ptr().  The AVP received from the server is present  in  last  of
       lastlen  size, which will be NULL on the first invocation.  The newly allocated output AVP
       to send to the server should be placed in *next of *nextlen size.

       The callback may invoke gnutls_ia_permute_inner_secret() to mix any generated session keys
       with the TLS/IA inner secret.

       Return 0 (GNUTLS_IA_APPLICATION_PAYLOAD) on success, or a negative error code to abort the
       TLS/IA handshake.

       Note that the callback must use allocate the next parameter using gnutls_malloc(), because
       it is released via gnutls_free() by the TLS/IA handshake function.

REPORTING BUGS

       Report       bugs       to       <bug-gnutls@gnu.org>.        GnuTLS       home      page:
       http://www.gnu.org/software/gnutls/     General     help     using      GNU      software:
       http://www.gnu.org/gethelp/

COPYRIGHT

       Copyright © 2008 Free Software Foundation.
       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  info  and
       gnutls programs are properly installed at your site, the command

              info gnutls

       should give you access to the complete manual.