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Subject: Re: Document support for @ character in UNC paths
To: cygwin AT cygwin DOT com
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From: Cedric Blancher via Cygwin <cygwin AT cygwin DOT com>
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On Tue, 25 Feb 2025 at 17:00, Takeshi Nishimura via Cygwin
<cygwin AT cygwin DOT com> wrote:
>
> Subject says it all, please document that @ characters in UNC paths
> are now supported, for WebDAV and BeeGFS
>

WebDAV and BeeGFS are not alone, the Windows ms-nfs41-client and
ms-nfs42-client ALWAYS (even with default NFSv4.1 port TCP/2049) use
UNC paths with "@" character, like
\\stripe02 DOT zebracluster DOT intra DOT pasteur DOT fr AT 2049\nfs4\disk02\
OpenText NFSv4.0 client also supports that, but only if you not use
the default NFSv4.0 TCP port.

So it's pretty common in UNC paths to have one @ (for port) or more @
(for other options like WebDAV's @SSL) in the UNC paths.

So yes, please, Cygwin should document this as a supported configuration.

Ced


> ---------- Forwarded message ---------
> From: Takeshi Nishimura <takeshi DOT nishimura DOT linux AT gmail DOT com>
> Date: Tue, Feb 25, 2025 at 4:58 PM
> Subject: Re: UNC path for WebDAV with cd '\\webdavsrv AT SSL\path' or cd
> '\\webdavsrv AT 23456\path' will not work
> To: <cygwin AT cygwin DOT com>
>
>
> On Sat, Feb 22, 2025 at 12:20 PM Corinna Vinschen via Cygwin
> <cygwin AT cygwin DOT com> wrote:
> >
> > On Feb 21 22:04, Takeshi Nishimura via Cygwin wrote:
> > > On Fri, Feb 21, 2025 at 11:28 AM Corinna Vinschen via Cygwin
> > > <cygwin AT cygwin DOT com> wrote:
> > > >
> > > > On Feb 20 23:36, Martin Wege via Cygwin wrote:
> > > > > On Thu, Feb 20, 2025 at 9:37 PM Corinna Vinschen via Cygwin
> > > > > > And here's the problem.  It works fine for me on all shares, be it SMB,
> > > > > > Samba, or NFS:
> > > > > >
> > > > > > https://cygwin.com/pipermail/cygwin/2025-February/257438.html
> > > > > >
> > > > > > > Maybe the hostname resolution in fhandler_netdrive::exists() failed?
> > > > > >
> > > > > > If so, it would be a problem on your side.
> > > > > > Does `nslookup ember.data4.local' return a valid address?
> > > > > >
> > > > > > I just pushed a patch to print a debug statement in strace output
> > > > > > to see what error code GetAddrInfoW returned.
> > > > >
> > > > > The code in https://cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=df307349a09e6f1ba75c78b1427dcea40f435e6e;hp=8a8fb570d7c5310a03a34b3dd6f9f8bb35ee9f40
> > > > > is not going to work, because you only give ret as argument, but not
> > > > > "name+2" as hostname.
> > > >
> > > > Yeah, it was obviously too late yesterday.  The patch was wrong twice.
> > > >
> > > > I pushed a patch for the patch which should show up in the just
> > > > building cygwin-3.6.0-0.381.g8cc55d819bb7 test release.
> > > >
> > > > > And speaking of the "hostname", is this the \\hostname\path of an UNC?
> > > > > In that case this will not work with WebDAV/SSL or WebDAV with custom
> > > > > port, which might be \\webdavserver AT SSL\path or
> > > > > \\webdavserver AT 23456\path, or \\webdavserver AT SSL@23456\path
> > > > > You need to replace the L'@' with L'\0' before calling GetAddrInfoW(),
> > > > > or it is not going to work with WebDAV
> > > >
> > > > I never saw that before.  Is that syntax really usable?
> > > >
> > > > I just spent half an hour trying to connect to a nextcloud instance
> > > > using this syntax, but to no avail.  https://... works.
> > > >
> > > > I have a local patch removing this at-sign, but I would first like
> > > > to hear if this is really usable and used.
> > >
> > > The BeeGFS Windows client uses that syntax to support more than one
> > > metadata server config per host, i.e.
> > > \\beegfs DOT example DOT com AT 14\beegfs\dir1\dir2....
> >
> > Oh, cool.  Can you check the latest Cygwin test release if it works
> > better with BeeGFS?
>
> https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=4bcc6adec765ee8354bfc9e6c060c9d1c0c7bf46
> works with BeeGFS, with @ in the UNC path
> --
> Internationalization&localization dev / 大阪大学
> Takeshi Nishimura <takeshi DOT nishimura DOT linux AT gmail DOT com>
>
>
> --
> Internationalization&localization dev / 大阪大学
> Takeshi Nishimura <takeshi DOT nishimura DOT linux AT gmail DOT com>
>
> --
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--
Cedric Blancher <cedric DOT blancher AT gmail DOT com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur

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