* FindFirstFile fails for some network directories
@ 2015-08-17 12:03 Orgad Shaneh
2015-08-19 5:46 ` Orgad Shaneh
0 siblings, 1 reply; 5+ messages in thread
From: Orgad Shaneh @ 2015-08-17 12:03 UTC (permalink / raw)
To: cygwin
Hi,
I have 2 network shares with similar contents:
\\netapp1\CM\CompilationResults
\\aclnas01\versions\CompilationResults
Trying to list all the files within these directories using Ruby
succeeds for netapp1, but fails for aclnas01.
The failing ruby command is:
ruby -e "print Dir.glob('//aclnas01/versions/CompilationResults/*')"
The exact same command succeeds when executed from a normal command
prompt, or when the directory is on netapp1 (on both shells).
After debugging Ruby, I found out that FindFirstFile returns an
INVALID_HANDLE when invoked from cygwin environment.
The following application succeeds on command prompt and fails on cygwin:
#include <stdio.h>
#include <windows.h>
int main()
{
const TCHAR *aclnas = TEXT("//aclnas01/versions/CompilationResults");
const TCHAR *netapp = TEXT("//netapp1/CM/CompilationResults");
WIN32_FIND_DATA fd;
printf("%d\n", FindFirstFile(aclnas, &fd) !=
INVALID_HANDLE_VALUE); // Fails on cygwin
printf("%d\n", FindFirstFile(netapp, &fd) !=
INVALID_HANDLE_VALUE); // Always succeeds
return 0;
}
Output on cmd is 1 1, on cygwin it is 0 1.
Process Monitor shows that when executed from cygwin, CreateFile is
called with Open for Backup flag. I can't say for sure if this causes
the failure, but that's the only difference I could find between these
executions.
This bug was previously reported on github/msys2[1], but it wasn't solved.
I only have read access to these servers, but I might have cooperation
of the sys admin (can't promise though).
Any help will be appreciated.
Thanks,
- Orgad
[1] https://github.com/Alexpux/MSYS2-packages/issues/242
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* Re: FindFirstFile fails for some network directories
2015-08-17 12:03 FindFirstFile fails for some network directories Orgad Shaneh
@ 2015-08-19 5:46 ` Orgad Shaneh
2015-08-19 6:28 ` Orgad Shaneh
0 siblings, 1 reply; 5+ messages in thread
From: Orgad Shaneh @ 2015-08-19 5:46 UTC (permalink / raw)
To: cygwin
On Mon, Aug 17, 2015 at 3:03 PM, Orgad Shaneh <orgads@gmail.com> wrote:
> Hi,
>
> I have 2 network shares with similar contents:
> \\netapp1\CM\CompilationResults
> \\aclnas01\versions\CompilationResults
>
> Trying to list all the files within these directories using Ruby
> succeeds for netapp1, but fails for aclnas01.
>
> The failing ruby command is:
> ruby -e "print Dir.glob('//aclnas01/versions/CompilationResults/*')"
>
> The exact same command succeeds when executed from a normal command
> prompt, or when the directory is on netapp1 (on both shells).
>
> After debugging Ruby, I found out that FindFirstFile returns an
> INVALID_HANDLE when invoked from cygwin environment.
>
> The following application succeeds on command prompt and fails on cygwin:
>
> #include <stdio.h>
> #include <windows.h>
>
> int main()
> {
> const TCHAR *aclnas = TEXT("//aclnas01/versions/CompilationResults");
> const TCHAR *netapp = TEXT("//netapp1/CM/CompilationResults");
>
> WIN32_FIND_DATA fd;
> printf("%d\n", FindFirstFile(aclnas, &fd) !=
> INVALID_HANDLE_VALUE); // Fails on cygwin
> printf("%d\n", FindFirstFile(netapp, &fd) !=
> INVALID_HANDLE_VALUE); // Always succeeds
> return 0;
> }
>
> Output on cmd is 1 1, on cygwin it is 0 1.
>
> Process Monitor shows that when executed from cygwin, CreateFile is
> called with Open for Backup flag. I can't say for sure if this causes
> the failure, but that's the only difference I could find between these
> executions.
>
> This bug was previously reported on github/msys2[1], but it wasn't solved.
>
> I only have read access to these servers, but I might have cooperation
> of the sys admin (can't promise though).
>
> Any help will be appreciated.
>
> Thanks,
> - Orgad
>
> [1] https://github.com/Alexpux/MSYS2-packages/issues/242
Hi,
Using Wireshark, I discovered that aclnas01 uses SMB, while netapp1 uses SMB2.
For some reason, when executed from command prompt, a FIND_FIRST2
request is sent and the server replies, while with cygwin a "NT Create
AndX" request is sent and denied.
To minimize the captured packets, I executed the application twice,
and captured only the second execution (to avoid session initiation).
Working capture: https://gist.github.com/orgads/d2681881668afb9cb08f
Failing capture: https://gist.github.com/orgads/4f0ea2b26cfd64f4353d
Does cygwin implement SMB on its own, or is this difference a
side-effect of the "Backup Intent" flag?
- Orgad
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* Re: FindFirstFile fails for some network directories
2015-08-19 5:46 ` Orgad Shaneh
@ 2015-08-19 6:28 ` Orgad Shaneh
2015-12-09 9:43 ` Orgad Shaneh
0 siblings, 1 reply; 5+ messages in thread
From: Orgad Shaneh @ 2015-08-19 6:28 UTC (permalink / raw)
To: cygwin
On Wed, Aug 19, 2015 at 8:46 AM, Orgad Shaneh <orgads@gmail.com> wrote:
> Working capture: https://gist.github.com/orgads/d2681881668afb9cb08f
> Failing capture: https://gist.github.com/orgads/4f0ea2b26cfd64f4353d
I just found another SMB1 linux server, which does work[1].
It first has a "NT Create AndX" request for path \, which succeeds.
Then it issues Trans2 FIND_FIRST2 request for the real path (\a).
This issue might be related to the Archive bit which is set on aclnas01.
- Orgad
[1] https://gist.github.com/orgads/e76a00c2cc0fc8a43d95
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* Re: FindFirstFile fails for some network directories
2015-08-19 6:28 ` Orgad Shaneh
@ 2015-12-09 9:43 ` Orgad Shaneh
2015-12-09 10:46 ` Corinna Vinschen
0 siblings, 1 reply; 5+ messages in thread
From: Orgad Shaneh @ 2015-12-09 9:43 UTC (permalink / raw)
To: cygwin
On Wed, Aug 19, 2015 at 8:28 AM, Orgad Shaneh <orgads@gmail.com> wrote:
>
> On Wed, Aug 19, 2015 at 8:46 AM, Orgad Shaneh <orgads@gmail.com> wrote:
> > Working capture: https://gist.github.com/orgads/d2681881668afb9cb08f
> > Failing capture: https://gist.github.com/orgads/4f0ea2b26cfd64f4353d
>
> I just found another SMB1 linux server, which does work[1].
>
> It first has a "NT Create AndX" request for path \, which succeeds.
> Then it issues Trans2 FIND_FIRST2 request for the real path (\a).
>
> This issue might be related to the Archive bit which is set on aclnas01.
>
> - Orgad
>
> [1] https://gist.github.com/orgads/e76a00c2cc0fc8a43d95
Hi,
After investigation, I found that the root cause for this problem is
set_cygwin_privileges, which sets SE_RESTORE_PRIVILEGE and
SE_BACKUP_PRIVILEGE for the process during initialization.
Commenting out these 2 lines solves the problem for me.
Can you tell why are they needed at all? There is a comment there:
Allow to access all files, independent of their ACL settings.
What does it mean?
- Orgad
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Documentation: http://cygwin.com/docs.html
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* Re: FindFirstFile fails for some network directories
2015-12-09 9:43 ` Orgad Shaneh
@ 2015-12-09 10:46 ` Corinna Vinschen
0 siblings, 0 replies; 5+ messages in thread
From: Corinna Vinschen @ 2015-12-09 10:46 UTC (permalink / raw)
To: cygwin
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On Dec 9 11:43, Orgad Shaneh wrote:
> On Wed, Aug 19, 2015 at 8:28 AM, Orgad Shaneh <orgads@gmail.com> wrote:
> >
> > On Wed, Aug 19, 2015 at 8:46 AM, Orgad Shaneh <orgads@gmail.com> wrote:
> > > Working capture: https://gist.github.com/orgads/d2681881668afb9cb08f
> > > Failing capture: https://gist.github.com/orgads/4f0ea2b26cfd64f4353d
> >
> > I just found another SMB1 linux server, which does work[1].
> >
> > It first has a "NT Create AndX" request for path \, which succeeds.
> > Then it issues Trans2 FIND_FIRST2 request for the real path (\a).
> >
> > This issue might be related to the Archive bit which is set on aclnas01.
> >
> > - Orgad
> >
> > [1] https://gist.github.com/orgads/e76a00c2cc0fc8a43d95
>
> Hi,
>
> After investigation, I found that the root cause for this problem is
> set_cygwin_privileges, which sets SE_RESTORE_PRIVILEGE and
> SE_BACKUP_PRIVILEGE for the process during initialization.
>
> Commenting out these 2 lines solves the problem for me.
>
> Can you tell why are they needed at all? There is a comment there:
>
> Allow to access all files, independent of their ACL settings.
>
> What does it mean?
These are the user privileges required to allow an admin user accessing
files which don't give him permissions to do so, just like a POSIX root
user. The usual behaviour of a filesystem should be to refuse the
setting without to fail.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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2015-08-17 12:03 FindFirstFile fails for some network directories Orgad Shaneh
2015-08-19 5:46 ` Orgad Shaneh
2015-08-19 6:28 ` Orgad Shaneh
2015-12-09 9:43 ` Orgad Shaneh
2015-12-09 10:46 ` Corinna Vinschen
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