gnutls_x509_name_constraints_add_permitted - API function
int gnutls_x509_name_constraints_add_permitted(gnutls_x509_name_constraints_t nc, gnutls_x509_subject_alt_name_t type, const gnutls_datum_t * name);
This function will add a name constraint to the list of permitted constraints. The constraints type can be any of the following types: GNUTLS_SAN_DNSNAME, GNUTLS_SAN_RFC822NAME, GNUTLS_SAN_DN, GNUTLS_SAN_URI, GNUTLS_SAN_IPADDRESS. For the latter, an IP address in network byte order is expected, followed by its network mask.
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.
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