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gnutls_dtls_cookie_send

NAME
SYNOPSIS
ARGUMENTS
DESCRIPTION
RETURNS
SINCE
REPORTING BUGS
COPYRIGHT
SEE ALSO

NAME

gnutls_dtls_cookie_send − API function

SYNOPSIS

#include <gnutls/gnutls.h>

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);

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.

RETURNS

the number of bytes sent, or a negative error code.

SINCE

3.0.0

REPORTING BUGS

Report bugs to <bug-gnutls@gnu.org>. GnuTLS home page: http://www.gnu.org/software/gnutls/ General help using GNU software: http://www.gnu.org/gethelp/

COPYRIGHT

Copyright © 2008 Free Software Foundation.
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.

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