gnutls_handshake_set_hook_function(3)

Linux manual pages	Section 3: Subroutines

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 terminate the handshake.

Note 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.

RETURNS

GNUTLS_E_SUCCESS on success, or an error code.

REPORTING BUGS

Report bugs to <bug-gnutls@gnu.org>.

General guidelines for reporting bugs: http://www.gnu.org/gethelp/

GnuTLS home page: http://www.gnu.org/software/gnutls/