gnutls_x509_crt_get_subject_alt_name man page on FreeBSD

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gnutls_x509_crt_get_subject_alt_namegnugnutls_x509_crt_get_subject_alt_name(3)

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 * criti‐
       cal);

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	other‐
       Name's  value field, and GNUTLS_SAN_OTHERNAME is returned.  You may use
       gnutls_x509_crt_get_subject_alt_othername_oid() to get the  correspond‐
       ing 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 your‐
       self.  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_MEM‐
       ORY_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  certifi‐
       cate does not have an Alternative name with the specified sequence num‐
       ber 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)
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