gnutls_handshake_set_hook_function man page on Archlinux

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gnutls_handshake_set_hook_function(3gnutlgnutls_handshake_set_hook_function(3)

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 post, gnutls_handshake_hook_func func);

ARGUMENTS
       gnutls_session_t session
		   is a gnutls_session_t structure

       unsigned int htype
		   the gnutls_handshake_description_t of the message  to  hook
		   at

       int post	   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  sent/generation
       use GNUTLS_HOOK_PRE as  post 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 termi‐
       nate the handshake.

       Note  to	 hook  at all handshake messages use an	 htype of GNUTLS_HAND‐
       SHAKE_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.

RETURNS
       GNUTLS_E_SUCCESS on success, or an error code.

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

COPYRIGHT
       Copyright © 2001-2014 Free Software Foundation, Inc..
       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				     3.3.gnutls_handshake_set_hook_function(3)
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