From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3838 invoked by alias); 19 Aug 2015 05:46:07 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 3829 invoked by uid 89); 19 Aug 2015 05:46:06 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.0 required=5.0 tests=AWL,BAYES_00,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2 X-HELO: mail-wi0-f178.google.com Received: from mail-wi0-f178.google.com (HELO mail-wi0-f178.google.com) (209.85.212.178) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES128-GCM-SHA256 encrypted) ESMTPS; Wed, 19 Aug 2015 05:46:04 +0000 Received: by wicja10 with SMTP id ja10so110503185wic.1 for ; Tue, 18 Aug 2015 22:46:02 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.180.108.175 with SMTP id hl15mr50296171wib.1.1439963161877; Tue, 18 Aug 2015 22:46:01 -0700 (PDT) Received: by 10.28.51.80 with HTTP; Tue, 18 Aug 2015 22:46:01 -0700 (PDT) In-Reply-To: References: Date: Wed, 19 Aug 2015 05:46:00 -0000 Message-ID: Subject: Re: FindFirstFile fails for some network directories From: Orgad Shaneh To: cygwin@cygwin.com Content-Type: text/plain; charset=UTF-8 X-SW-Source: 2015-08/txt/msg00325.txt.bz2 On Mon, Aug 17, 2015 at 3:03 PM, Orgad Shaneh 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 > #include > > 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 -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple