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gnutls_dtls_cookie_send(3) gnutls gnutls_dtls_cookie_send(3) NAME gnutls_dtls_cookie_send - API function SYNOPSIS #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); 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 in- coming packet was originated from. This function must be called at the first incoming packet, prior to al- locating any resources and must be succeeded by gnutls_dtls_cookie_ver- ify(). RETURNS the number of bytes sent, or a negative error code. SINCE 3.0 REPORTING BUGS Report bugs to <bugs@gnutls.org>. Home page: https://www.gnutls.org COPYRIGHT Copyright (C) 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 no- tice and this notice are preserved. SEE ALSO The full documentation for gnutls is maintained as a Texinfo manual. If the /usr/local/share/doc/gnutls/ directory does not contain the HTML form visit https://www.gnutls.org/manual/ gnutls 3.8.9 gnutls_dtls_cookie_send(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | SINCE | REPORTING BUGS | COPYRIGHT | SEE ALSO
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