gnutls_handshake_set_post_clgnutlsehandshakeiset3post_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_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 any-
thing 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 termi-
nate 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 at-
tack being performed.
REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
COPYRIGHT
Copyright © 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 no-
tice 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
https://www.gnutls.org/manual/
gnutls gnutls_handshake_set_post_client_hello_function(3)
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