gnutls_handshake_set_post_client_hello_function

gnutls_handshake_set_post_cliegnutlslhandshakenset_post_client_hello_function(3)



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_post_client_hello_func       func);

ARGUMENTS
       gnutls_session_t session
                   is a gnutls_session_t type.

       gnutls_handshake_post_client_hello_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: http://www.gnutls.org


COPYRIGHT
       Copyright © 2001-2016 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/share/doc/gnutls/ directory does not contain the HTML form visit

       http://www.gnutls.org/manual/

gnutls                        gnutls_handshake_set_post_client_hello_function(3)