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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_rehandshake(3) gnutls gnutls_rehandshake(3)
gnutls_rehandshake - API function
#include <gnutls/gnutls.h>
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 parameters.
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
this request.
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.
GNUTLS_E_SUCCESS on success, otherwise a negative error code.
Report bugs to <[email protected]>.
Home page: https://www.gnutls.org
Copyright © 2001-2023 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.
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
https://www.gnutls.org/manual/
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to [email protected]. This page was obtained
from the tarball fetched from
⟨https://www.gnupg.org/ftp/gcrypt/gnutls/⟩ on 2025-08-11. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to [email protected]
gnutls 3.8.10 gnutls_rehandshake(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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