Section: gnutls (3)
gnutls_rehandshake - API function
int gnutls_rehandshake(gnutls_session_t session);
- gnutls_session_t session
is a gnutls_session_t type.
This function can only be called in server side, and
instructs a TLS 1.2 or earlier client to renegotiate
parameters (perform a handshake), by sending a
hello request message.
If this function succeeds, the calling application
should call gnutls_record_recv() until GNUTLS_E_REHANDSHAKE
is returned to clear any pending data. If the GNUTLS_E_REHANDSHAKE
error code is not seen, then the handshake request was
not followed by the peer (the TLS protocol does not require
the client to do, and such compliance should be handled
by the application protocol).
Once the GNUTLS_E_REHANDSHAKE error code is seen, the
calling application should proceed to calling
gnutls_handshake() to negotiate the new
If the client does not wish to renegotiate parameters he
may reply with an alert message, and in that case the return code seen
by subsequent gnutls_record_recv() will be
GNUTLS_E_WARNING_ALERT_RECEIVED with the specific alert being
GNUTLS_A_NO_RENEGOTIATION. A client may also choose to ignore
Under TLS 1.3 this function is equivalent to gnutls_session_key_update()
with the GNUTLS_KU_PEER flag. In that case subsequent calls to
gnutls_record_recv() will not return GNUTLS_E_REHANDSHAKE, and
calls to gnutls_handshake() in server side are a no-op.
This function always fails with GNUTLS_E_INVALID_REQUEST when
called in client side.
on success, otherwise a negative error code.
Report bugs to <email@example.com
Home page: https://www.gnutls.org
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