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NAME

       gnutls_x509_crt_get_subject_alt_name  -  Get  certificate’s alternative
       name, if any

SYNOPSIS

       #include <gnutls/x509.h>

       int    gnutls_x509_crt_get_subject_alt_name(gnutls_x509_crt_t     cert,
       unsigned  int  seq,  void  *  ret,  size_t  *  ret_size, unsigned int *
       critical);

ARGUMENTS

       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t structure

       unsigned int seq
                   specifies the sequence number of the alt name  (0  for  the
                   first one, 1 for the second etc.)

       void * ret  is the place where the alternative name will be copied to

       size_t * ret_size
                   holds the size of ret.

       unsigned int * critical
                   will  be  non  zero  if the extension is marked as critical
                   (may be null)

DESCRIPTION

       This function will return the alternative names, contained in the given
       certificate.

       This is specified in X509v3 Certificate Extensions.  GNUTLS will return
       the Alternative name (2.5.29.17), or a negative error code.

       When the SAN type is  otherName,  it  will  extract  the  data  in  the
       otherName’s value field, and GNUTLS_SAN_OTHERNAME is returned.  You may
       use   gnutls_x509_crt_get_subject_alt_othername_oid()   to   get    the
       corresponding    OID    and    the    "virtual"    SAN   types   (e.g.,
       GNUTLS_SAN_OTHERNAME_XMPP).

       If an otherName OID is known, the data will be decoded.  Otherwise  the
       returned  data  will  be  DER  encoded,  and you will have to decode it
       yourself.   Currently,  only  the  RFC  3920  id-on-xmppAddr   SAN   is
       recognized.

RETURNS

       the  alternative  subject  name  type on success, one of the enumerated
       gnutls_x509_subject_alt_name_t.          It         will         return
       GNUTLS_E_SHORT_MEMORY_BUFFER  if  ret_size  is not large enough to hold
       the value.  In that case ret_size will be  updated  with  the  required
       size.   If  the  certificate does not have an Alternative name with the
       specified sequence number then GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is
       returned.

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.

gnutls                               2.gnutls_x509_crt_get_subject_alt_name(3)