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gnutls_handshake_set_hook_function(3)                                   gnutls

NAME
       gnutls_handshake_set_hook_function - API function

SYNOPSIS
       #include <gnutls/gnutls.h>

       void gnutls_handshake_set_hook_function(gnutls_session_t session,
       unsigned int htype, int when, gnutls_handshake_hook_func func);

ARGUMENTS
       gnutls_session_t session
                   is a gnutls_session_t type

       unsigned int htype
                   the gnutls_handshake_description_t of the message to hook
                   at

       int when    GNUTLS_HOOK_* depending on when the hook function should be
                   called

       gnutls_handshake_hook_func func
                   is the function to be called

DESCRIPTION
       This function will set a callback to be called after or before the
       specified handshake message has been received or generated. This is a
       generalization of gnutls_handshake_set_post_client_hello_function().

       To call the hook function prior to the message being generated or
       processed use GNUTLS_HOOK_PRE as  when parameter, GNUTLS_HOOK_POST to
       call after, and GNUTLS_HOOK_BOTH for both cases.

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

       To hook at all handshake messages use an  htype of
       GNUTLS_HANDSHAKE_ANY.

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_hook_function(3)