gnutls_x509_crt_get_subject_alt_name man page on FreeBSD
gnutls_x509_crt_get_subject_alt_name - Get certificate's alternative
name, if any
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‐
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)
This function will return the alternative names, contained in the given
This is specified in X509v3 Certificate Extensions. GNUTLS will return
the Alternative name (184.108.40.206), 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.
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.
Report bugs to <firstname.lastname@example.org>. GnuTLS home page:
http://www.gnu.org/software/gnutls/ 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,
should give you access to the complete manual.
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