int gnutls_x509_crt_get_subject_alt_othername_oid(gnutls_x509_crt_t cert, unsigned int seq, void * ret, size_t * ret_size);
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 otherName OID will be copied to
size_t * ret_size
holds the size of ret.
This function will extract the type OID of an otherName Subject
Alternative Name, contained in the given certificate, and return
the type as an enumerated element.
This function is only useful if
the alternative subject name type on success, one of the
enumerated gnutls_x509_subject_alt_name_t. For supported OIDs, it
will return one of the virtual (GNUTLS_SAN_OTHERNAME_*) types,
e.g. GNUTLS_SAN_OTHERNAME_XMPP, and GNUTLS_SAN_OTHERNAME for
unknown OIDs. 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 and with the otherName type then
GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE is returned.