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From Greg Wittel <gwit...@proofpoint.com>
Subject [users@httpd] mod_dav -- Small Files Corrupt if locked first
Date Wed, 19 Dec 2007 17:05:36 GMT
Working on setting up file upload via DAV and I've found an odd problem...

If a file is <= 8192 bytes AND I've placed a protective lock on the file 
before sending, it will be corrupted.

If I don't put a write lock before sending the file, it arrives fine.  If I 
send something > 8192 bytes protective locks are OK.

I'm not sure if this was fixed in a later HTTPD, I don't have the option of 
upgading =/.  I couldn't find anything in Bugzilla, and I've dumped the 
data posted to Apache via the DAV client, and that is correct.

Any thoughts?  Test case/Apache info below
-Greg

DAV Client: Perl HTTP::DAV 0.31 / dave
Apache Info:
     Apache/2.0.55 (Unix) mod_ssl/2.0.55
    OpenSSL/0.9.8a DAV/2 mod_perl/1.999.21 Perl/v5.8.6

Test case:

Test files and correct MD5s:
    $ dd if=/dev/urandom of=test-8k.bin bs=8k count=1
    $ dd if=/dev/urandom of=test-8.nk.bin bs=8193 count=1
    $ md5sum test-8k.bin test-8.nk.bin
    629d17eb9106740898ead91f88c55181  test-8k.bin
    1bd8d5c63f391881b5c68c294f3e8a58  test-8.nk.bin

    $ dave -u user -p 'pass' https://davhost:davport/blah/
    Duplicate specification "man|?" for option "?"
    ...

(1) File Corrupted if lock issued:

dave> lock test-8k.bin
dave> put test-8k.bin test-8k.bin
   put https://(uri)/test-8k.bin (8192 bytes) (success)
dave> unlock test-8k.bin

(2) File not corrupt (8192 byte) / no lock:
dave> put test-8k.bin test-8k.bin

   $ md5sum test-8k.bin
   a1f8386ab62fc5acd73e694f255af6a6  test-8k.bin

(2) File not corrupt (8193 bytes):

dave> lock test-8.nk.bin
dave> put test-8.nk.bin test-8.nk.bin
   put https://(uri)/test-8.nk.bin (8193 bytes) (success)
dave> unlock test-8.nk.bin



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