gnutls_dtls_cookie_send(3) gnutls gnutls_dtls_cookie_send(3)
NAME
gnutls_dtls_cookie_send - API function
SYNOPSIS
#include <gnutls/dtls.h>
gnutls_dtls_cookie_send(3) * key, void * client_data,
size_t client_data_size, gnutls_dtls_prestate_st * prestate,
gnutls_transport_ptr_t ptr, gnutls_push_func push_func);
ARGUMENTS
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
DESCRIPTION
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 by
gnutls_dtls_cookie_verify().
RETURNS
the number of bytes sent, or a negative error code.
SINCE
3.0
REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: http://www.gnutls.org
COPYRIGHT
Copyright (C) 2001-2013 Free Software Foundation, Inc.
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.
SEE ALSO
The full documentation for gnutls is maintained as a Texinfo manual.
If the /usr/share/doc/gnutls/ directory does not contain the HTML form
visit
http://www.gnutls.org/manual/
gnutls 3.2.8 gnutls_dtls_cookie_send(3)
gnutl 3.2.8.1 - Generated Wed Jan 15 19:15:59 CST 2014