GitHub - OpenVPN/openvpn: OpenVPN is an open source VPN daemon

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lstipakov and cron2 Don't overwrite socket flags when using DCO on Windows

Mar 24, 2023

Don't overwrite socket flags when using DCO on Windows

Socket flags can be pushed, in which case they overwrite
existing value. We use socket flags to distingust between
DCO handle and socket on Windows. If server pushes --socket-flags,
we treat DCO handle as socket and everything explodes.

Fix by making link_socket_update_flags() update flags
(like name suggests) instead of overwriting them. Also
do not set TCP_NODELAY on DCO handle on Windows because
it doesn't make sense.

Change-Id: Ia34d73ca49041cb0ce22b84751cdbff57de96048
Signed-off-by: Lev Stipakov <lev@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20230324121818.2358-1-lstipakov@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26513.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>

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README

OpenVPN -- A Secure tunneling daemon

Copyright (C) 2002-2022 OpenVPN Inc. This program is free software;
you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation.

*************************************************************************

To get the latest release of OpenVPN, go to:

	https://openvpn.net/community-downloads/

To Build and Install,

	tar -zxf openvpn-<version>.tar.gz
	cd openvpn-<version>
	./configure
	make
	make install

or see the file INSTALL for more info.

*************************************************************************

For detailed information on OpenVPN, including examples, see the man page
  http://openvpn.net/man.html

For a sample VPN configuration, see
  http://openvpn.net/howto.html

To report an issue, see
  https://github.com/OpenVPN/openvpn/issues/new
  (Note: We recently switched to GitHub for reporting new issues,
   old issues can be found at:
   https://community.openvpn.net/openvpn/report)

For a description of OpenVPN's underlying protocol,
  see the file ssl.h included in the source distribution.

*************************************************************************

Other Files & Directories:

* configure.ac -- script to rebuild our configure
  script and makefile.

* sample/sample-scripts/verify-cn

  A sample perl script which can be used with OpenVPN's
  --tls-verify option to provide a customized authentication
  test on embedded X509 certificate fields.

* sample/sample-keys/

  Sample RSA keys and certificates.  DON'T USE THESE FILES
  FOR ANYTHING OTHER THAN TESTING BECAUSE THEY ARE TOTALLY INSECURE.

* sample/sample-config-files/

  A collection of OpenVPN config files and scripts from
  the HOWTO at http://openvpn.net/howto.html

*************************************************************************

Note that easy-rsa and tap-windows are now maintained in their own subprojects.
Their source code is available here:

  https://github.com/OpenVPN/easy-rsa
  https://github.com/OpenVPN/tap-windows6

The old cross-compilation environment (domake-win) and the Python-based
buildsystem have been replaced with openvpn-build:

  https://github.com/OpenVPN/openvpn-build

See the INSTALL file for usage information.