samba - Mar 2012 - 2 GB file size limit with libsmbclient and Filesys::SmbClient perl module?!

Hi,

I have a 32-bit installation of Arch Linux and I have developed my own little
script (in perl) for downloading files over SMB/CIFS using multiple TCP
connections to speed up the transfer. I have googled a lot but could not find
any good download accelerator for files hosted over SMB/ CIFS. For example, the
DownThemAll firefox add-on allows you to download files hosted over SMB/ CIFS,
but is not able to speed it up using multiple parallel connections. That being
the motivation for me to write my own script which splits a file into multiple
chunks and downloads them in parallel.

Now, my script is written in perl and uses Filesys::SmbClient, which in turn,
uses libsmbclient for SMB/ CIFS access.
Attached is my script tarball.

The problem I am facing, is that, I am unable to download files over 2GB in
size!!!
I know this has to do "something" with 32-bitness and other parameters
like _FILE_OFFSET_BITS=64 etc. while compiling various components, but I am out
of my wits end to understand where the problem is. I have no specific 32/64
bitness in my perl script. So I assume it must be a problem either in
Filesys::Smbclient or in libsmbclient itself?

My environment is as follows:


1)      Arch Linux 32 bit.

2)      Perl 32 bit (obviously)

3)      The SMB/ CIFS share is hosted on a Windows box (and not SAMBA).
Everything works fine if I try to download using explorer, which means it's
something in the toolchain (perl/libsmbclient) that I am using.

4)      Latest versions of everything. Perl is version 5.14, smbclient package
is version 3.6.3-4, Filesys::Smbclient is version 3.1

Specifically, when I call a stat() on the file before beginning to download the
file, for files over 2GB, the file size is reported as zero!
What can be the problem here?
Any advice on what can I do to troubleshoot more?
Could it be that somewhere, a 64 bit value is getting truncated to a 32 bit
value, leaving the size as zero.

Thanks and Regards,
-Devavrat

Le Mon, 26 Mar 2012 00:59:47 -0700
Devavrat Mittal <Devavrat_Mittal at symantec.com> ?crivait:
> Now, my script is written in perl and uses Filesys::SmbClient, which
> in turn, uses libsmbclient for SMB/ CIFS access. Attached is my
> script tarball.
As Filesys::SmbClient uses libsmbclient.so, I'd first try using the
smbclient command  to list and transfer files to check that it actually
behaves as expected.

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