I've stared at the code for a while... I'm not really happy with the
jumping back and forth between dco.c and tun.c (who is supposed to
understand that code flow in 6 weeks from now?). That said, the
"non windows" changes in this patch are harmless enough, and the
"windows bits" do look safe enough (wrt memory issues etc).
I notice a distinct lack of comments on "what do all these functions
do?" - neither dco_win.h nor dco_win.c have function descriptions
(what does it do, what goes in, what comes out). Like, dco_connect_wait()
or dco_create_socket()... this really should be improved.
Some constructs nest too deeply...
+ DWORD err = GetLastError();
+ if (err != ERROR_IO_PENDING)
+ {
+ msg(M_ERR, "DeviceIoControl(OVPN_IOCTL_NEW_PEER) failed");
+ }
+ else
+ {
+ if (dco_connect_wait(tt.hand, &ov, timeout, signal_received) < 0)
+ {
+ close_tun_handle(&tt);
+ }
+ }
.. M_ERR does not return, so why have an else { } level here?
+ OVPN_CRYPTO_DATA crypto_data;
+ ZeroMemory(&crypto_data, sizeof(crypto_data));
.. we do have CLEAR(crypto_data) for this purpose. Do not invent new
code for each platform to zeroize memory.
+ ASSERT(crypto_data.CipherAlg > 0);
this looks a bit out of place, 10+ lines after the CipherAlg assignment...
Since I currently can't build MinGW, I've pushed this to Github for
building, and the GHA-mingw/mingw64 builds succeed (and so does the
rest).
I've also subjected this to the linux DCO test rig "to be sure" - though
*these* changes really should not upset other platforms. Seems they
do not :-)
My local git hook complains about formatting of ovpn_dco_win.h - we do
exclude that now in dev-tools/special-files.lst, but that is not effective
on the initial commit. Not sure, though, why we want to maintain something
only maintained by us in a different coding style... I can see this for
dco-linux (where "the Linux people" want a different style) - but here?
Anyway.
Your patch has been applied to the master branch.
commit 8b80cbc3846a56581e373a664db20d227a90120a
Author: Antonio Quartulli
Date: Sat Aug 13 22:42:18 2022 +0200
dco-win: introduce low-level code for handling ovpn-dco-win in Windows
Signed-off-by: Arne Schwabe <a...@rfc2549.org>
Signed-off-by: Lev Stipakov <l...@openvpn.net>
Signed-off-by: Antonio Quartulli <a...@unstable.cc>
Acked-by: Lev Stipakov <lstipa...@gmail.com>
Message-Id: <20220813204224.22576-...@unstable.cc>
URL:
https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg24919.html
Signed-off-by: Gert Doering <g...@greenie.muc.de>
--
kind regards,
Gert Doering
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