gnutls\_dtls\_cookie\_verify(3) gnutls gnutls\_dtls\_cookie\_verify(3)

# [NAME](#NAME)

gnutls\_dtls\_cookie\_verify - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <gnutls/dtls.h>**

**int gnutls\_dtls\_cookie\_verify(gnutls\_datum\_t * key, void * client\_data, size\_t client\_data\_size, void * \_msg, size\_t msg\_size, gnutls\_dtls\_prestate\_st * prestate);**

# [ARGUMENTS](#ARGUMENTS)

[gnutls\_datum\_t * key](#gnutls_datum_t)

is a random key to be used at cookie generation

[void * client\_data](#void)

contains data identifying the client (i.e. address)

[size\_t client\_data\_size](#size_t)

The size of client's data

[void * \_msg](#void~2)

An incoming message that initiates a connection.

[size\_t msg\_size](#size_t~2)

The size of the message.

[gnutls\_dtls\_prestate\_st * prestate](#gnutls_dtls_prestate_st)

The cookie of this client.

# [DESCRIPTION](#DESCRIPTION)

This function will verify the received message for a valid cookie. If a valid cookie is returned then it should be associated with the session using **gnutls\_dtls\_prestate\_set()**;

This function must be called after **gnutls\_dtls\_cookie\_send()**.

# [RETURNS](#RETURNS)

**GNUTLS\_E\_SUCCESS** (0) on success, or a negative error code.

# [SINCE](#SINCE)

3.0

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to <bugs@gnutls.org>.  
Home page: https://www.gnutls.org

# [COPYRIGHT](#COPYRIGHT)

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.

# [SEE ALSO](#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

[https://www.gnutls.org/manual/](https://www.gnutls.org/manual/)

3.8.13 gnutls

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Document: gnutls_dtls_cookie_verify(3) from gnutls 3.8.13-r3 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls