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gnutls_handshake_set_post_client_hello_function(3)                      gnutls

NAME
       gnutls_handshake_set_post_client_hello_function - API function

SYNOPSIS
       #include <gnutls/gnutls.h>

       void gnutls_handshake_set_post_client_hello_function(gnutls_session_t
       session, gnutls_handshake_simple_hook_func func);

ARGUMENTS
       gnutls_session_t session
                   is a gnutls_session_t type.

       gnutls_handshake_simple_hook_func func
                   is the function to be called

DESCRIPTION
       This function will set a callback to be called after the client hello
       has been received (callback valid in server side only). This allows the
       server to adjust settings based on received extensions.

       Those settings could be ciphersuites, requesting certificate, or
       anything else except for version negotiation (this is done before the
       hello message is parsed).

       This callback must return 0 on success or a gnutls error code to
       terminate the handshake.

       Since GnuTLS 3.3.5 the callback is allowed to return GNUTLS_E_AGAIN or
       GNUTLS_E_INTERRUPTED to put the handshake on hold. In that case
       gnutls_handshake() will return GNUTLS_E_INTERRUPTED and can be resumed
       when needed.

WARNING
       You should not use this function to terminate the handshake based on
       client input unless you know what you are doing. Before the handshake
       is finished there is no way to know if there is a man-in-the-middle
       attack being performed.

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

COPYRIGHT
       Copyright (C) 2001- 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
       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                               3.7.9
                            gnutls_handshake_set_post_client_hello_function(3)