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       gnutls_x509_crt_get_basic_constraints   -  This  function  returns  the
       certificate basic constraints


       #include <gnutls/x509.h>

       int    gnutls_x509_crt_get_basic_constraints(gnutls_x509_crt_t    cert,
       unsigned int * critical, int * ca, int * pathlen);


       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t structure

       unsigned int * critical
                   will be non zero if the extension is marked as critical

       int * ca    pointer  to  output  integer  indicating  CA status, may be
                   NULL, value is 1 if the  certificate  CA  flag  is  set,  0

       int * pathlen
                   pointer  to  output  integer indicating path length (may be
                   NULL),   non-negative    values    indicate    a    present
                   pathLenConstraint  field  and the actual value, -1 indicate
                   that the field is absent.


       This function will read the certificate’s basic constraints, and return
       the  certificates  CA  status.   It  reads  the  basicConstraints X.509
       extension (


       If the certificate is a CA a positive value will be returned,  or  zero
       if  the certificate does not have CA flag set.  A negative value may be
       returned in case of errors.  If the certificate does  not  contain  the
       basicConstraints  extension  GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will
       be returned.


       Report   bugs   to    <>.     GnuTLS    home    page:  General  help  using GNU software:


       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.


       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.

gnutls                               2gnutls_x509_crt_get_basic_constraints(3)