@deftypefun {int} {gnutls_x509_ext_import_proxy} (const gnutls_datum_t * @var{ext}, int * @var{pathlen}, char ** @var{policyLanguage}, char ** @var{policy}, size_t * @var{sizeof_policy})
@var{ext}: the DER encoded extension data

@var{pathlen}: pointer to output integer indicating path length (may be
NULL), non-negative error codes indicate a present pCPathLenConstraint
field and the actual value, -1 indicate that the field is absent.

@var{policyLanguage}: output variable with OID of policy language

@var{policy}: output variable with policy data

@var{sizeof_policy}: output variable with size of policy data

This function will return the information from a proxy certificate
extension. It reads the ProxyCertInfo X.509 extension (1.3.6.1.5.5.7.1.14).
The  @code{policyLanguage} and  @code{policy} values must be deinitialized using @code{gnutls_free()}  after use.

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned, otherwise a
negative error value.

@strong{Since:} 3.3.0
@end deftypefun