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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | SINCE | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_dtls_cookie_send(3) gnutls gnutls_dtls_cookie_send(3)
gnutls_dtls_cookie_send - API function
#include <gnutls/dtls.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);
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 by
gnutls_dtls_cookie_verify().
the number of bytes sent, or a negative error code.
3.0
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
Copyright © 2001-2023 Free Software Foundation, Inc., and others.
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.
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
https://www.gnutls.org/manual/
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to bugs@gnutls.org. This page was obtained
from the tarball fetched from
⟨https://www.gnupg.org/ftp/gcrypt/gnutls/⟩ on 2025-08-11. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to man-pages@man7.org
gnutls 3.8.10 gnutls_dtls_cookie_send(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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