NAME

       gnutls_x509_trust_list_set_getissuer_function - API function

SYNOPSIS

       #include <gnutls/x509.h>

       void             gnutls_x509_trust_list_set_getissuer_function(gnutls_x509_trust_list_t            tlist,
       gnutls_x509_trust_list_getissuer_function * func);

ARGUMENTS

       gnutls_x509_trust_list_t tlist
                   is a gnutls_x509_trust_list_t type.

       gnutls_x509_trust_list_getissuer_function * func
                   is the callback function

DESCRIPTION

       This function sets a callback to be called when the peer's certificate chain is incomplete due a  missing
       intermediate certificate. The callback may provide the missing certificate for use during verification.

       The callback's function prototype is defined in gnutls/x509.h as:

       int (*callback)(gnutls_x509_trust_list_t list, const gnutls_x509_crt_t cert, gnutls_x509_crt_t **issuers,
       unsigned int *issuers_size);

       If  the  callback  function  is  provided  then  gnutls  will call it during the certificate verification
       procedure. The callback may wish to use gnutls_x509_crt_get_authority_info_access() to  get  a  URI  from
       which to attempt to download the missing issuer certificate, if available.

       On  a successful call, the callback shall set '*issuers' and '*issuers_size' even if the result is empty;
       in that case '*issuers' will point  to  NULL  and  allocated  using  gnutls_x509_crt_list_import2().  The
       ownership  of  both the array and the elements is transferred to the caller and thus the application does
       not need to maintain the memory after the call.

       The callback function should return 0 if the attempt  to  retrieve  the  issuer  certificates  for  'crt'
       succeeded,  or non-zero to indicate any error occurred during the attempt. In the latter case, '*issuers'
       and '*issuers_size' are not set.

SINCE

       3.7.0

REPORTING BUGS

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

COPYRIGHT

       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

       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

       https://www.gnutls.org/manual/

gnutls                                                3.8.3     gnutls_x509_trust_list_set_getissuer_function(3)