Section: gnutls (3)
gnutls_dtls_cookie_send - API function
int gnutls_dtls_cookie_send(gnutls_datum_t * key, void * client_data, size_t client_data_size, gnutls_dtls_prestate_st * prestate, gnutls_transport_ptr_t ptr, gnutls_push_func push_func);
- gnutls_datum_t * key
is a random key to be used at cookie generation
- void * client_data
contains data identifying the client (i.e. address)
- size_t client_data_size
The size of client's data
- gnutls_dtls_prestate_st * prestate
The previous cookie returned by gnutls_dtls_cookie_verify()
- gnutls_transport_ptr_t ptr
A transport pointer to be used by push_func
- gnutls_push_func push_func
A function that will be used to reply
This function can be used to prevent denial of service
attacks to a DTLS server by requiring the client to
reply using a cookie sent by this function. That way
it can be ensured that a client we allocated resources
for (i.e. gnutls_session_t
) is the one that the
original incoming packet was originated from.
This function must be called at the first incoming packet,
prior to allocating any resources and must be succeeded
the number of bytes sent, or a negative error code.
Report bugs to <email@example.com
Home page: https://www.gnutls.org
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