gnutls_x509_crt_get_subject_alt_name(3) 			      gnutls				   gnutls_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 * 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_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  cer-
       tificate 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 (C) 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								       2.8.6				   gnutls_x509_crt_get_subject_alt_name(3)