gnutls_handshake_set_post_client_hello_function (3) - Linux Manuals
gnutls_handshake_set_post_client_hello_function: API function
NAMEgnutls_handshake_set_post_client_hello_function - API function
- gnutls_session_t session
- is a gnutls_session_t structure.
- gnutls_handshake_post_client_hello_func func
- is the function to be called
DESCRIPTIONThis 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.
WARNINGYou 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 BUGSReport bugs to <bugs [at] gnutls.org>.
Home page: http://www.gnutls.org
COPYRIGHTCopyright © 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 ALSOThe full documentation for gnutls is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit