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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | WARNING | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
gnutls_handshake_set_post_client_hello_function(3)t_client_hello_function(3)
gnutls_handshake_set_post_client_hello_function - API function
#include <gnutls/gnutls.h>
void gnutls_handshake_set_post_client_hello_function(gnutls_session_t
session, gnutls_handshake_simple_hook_func func);
gnutls_session_t session
is a gnutls_session_t type.
gnutls_handshake_simple_hook_func func
is the function to be called
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.
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.
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
Copyright © 2001-2019 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.
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/
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this manual
page, send it to bugs@gnutls.org. This page was obtained from the
tarball gnutls-3.6.9.tar.xz fetched from
⟨http://www.gnutls.org/download.html⟩ on 2020-08-13. If you discover
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COLOPHON (which is not part of the original manual page), send a mail
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gnutls gnutls_han3d.s6h.a9ke_set_post_client_hello_function(3)