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)