Bugs item #1951588, was opened at 2008-04-25 14:38
Message generated for change (Settings changed) made by bagder
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Category: ftp
Group: bad behaviour
>Status: Closed
Resolution: Fixed
Priority: 5
Private: No
Submitted By: n.f. (norbertf)
Assigned to: Daniel Stenberg (bagder)
Summary: Problem with curlftpfs and libcurl-7.18.1, libcurl/7.18.2-CV

Initial Comment:
Hi,

I got a weird problem with curlftpfs 0.9.2 (in svn) and libcurl 7.18.
(It worked with libcurl 7.17.0).

When i try to download a file with cat /filename (this operation uses
curl_multi_perform()), the first attempt fails. Libcurl seems to try to
reconnect and sends garbage as user and password (see below). All the
other operations (which use curl_easy) and later download attempts work.

Is there any know bug or behavioral change in libcurl, which might be
related to this?

The current curlftpfs code is here:
http://code.google.com/p/curlftpfs/source/checkout

Cheers,
Norbert

* STATE: INIT => CONNECT handle 0x80906cc; (connection #-5000)
* Couldn't find host www.xxxxxx.at in the .netrc file, using defaults
* About to connect() to www.xxxxxxx.at port 8021 (#0)
* Trying 192.168.5.2... * STATE: CONNECT => WAITCONNECT handle
0x80906cc; (connection #0)
* Connected to www.xxxxxxxx.at (192.168.5.2) port 8021 (#0)
* FTP 0x8067978 state change from STOP to WAIT220
* STATE: WAITCONNECT => PROTOCONNECT handle 0x80906cc; (connection #0)
< 220 ready();
> USER 168.5.2
* FTP 0x8067978 state change from WAIT220 to USER
< 331 Password required for 168.5.2.
> PASS xxxxxxxxxxxx
* FTP 0x8067978 state change from USER to PASS
< 530 Login incorrect.
* Access denied: 530
* Expire cleared
* Closing connection #0
* STATE: PROTOCONNECT => COMPLETED handle 0x80906cc; (connection #-5000)
1209116192 ftpfs.c:392 error: curl_multi_info 1

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>Comment By: Daniel Stenberg (bagder)
Date: 2008-04-29 21:45

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Thanks for verifying, closing this report now.

And rather than "keep an eye" on curlftpfs we should strive to add test
cases that make sure that even these kinds of uses are tested... IMHO of
course.

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Comment By: n.f. (norbertf)
Date: 2008-04-29 01:27

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Thanks very much. This patch seems to fix the problem. And yes - curlftpfs
is a bit like a hardcore testing suite for libcurl - i guess curl devels
should keep an eye on it :-)

Norbert

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Comment By: Daniel Stenberg (bagder)
Date: 2008-04-28 23:12

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The attached libcurl patch seems to cure the problem for me!

Yeps, it certainly was a pointer mistake in libcurl. curlftpfs does a very
unusual mix of the easy and multi interface which I think is the reason
this is the only known victim of this problem.

Let me know how this patch works for you!
File Added: ftp-userpwd.patch

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Comment By: n.f. (norbertf)
Date: 2008-04-28 19:01

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co and compile: http://code.google.com/p/curlftpfs/source/checkout
curlftpfs -V
--> curlftpfs 0.9.2 libcurl/7.18.2-CVS fuse/2.7

run this in the first terminal:

mkdir /tmp/ftp
curlftpfs -v -o debug,ftpfs_debug=4,user=username www.host.org /tmp/ftp
-f

in the second terminal:

cat /tmp/ftp/filename

i didn't use .netrc.

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Comment By: Dan Fandrich (dfandrich)
Date: 2008-04-28 18:48

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What is the complete sequence of operations to reproduce this using
curlftpfs? What mount options? What is in the .netrc file? What operations
on the filesystem?

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Comment By: Daniel Stenberg (bagder)
Date: 2008-04-28 10:19

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Yes, but note that the other case of this reported problem ALSO involved
curlftpfs and that nobody else have reported this problem so the
pointer/memory problem could very well be in the curlftpfs code. If you
cannot repeat this problem with a stand-alone program (without using
curlftpfs) that'll remain my guess.

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Comment By: n.f. (norbertf)
Date: 2008-04-28 00:14

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> Is this the same problem as discussed here:
> http://curl.haxx.se/mail/archive-2008-02/0018.html and
> http://curl.haxx.se/mail/lib-2008-02/0108.html ?

Yup, could be. Looks a bit like a pointer corruption problem. In both
cases it sends weird characters (like parts of the IP-address or the URL)
as user/password. It's probably hard to write a test-case for this, because
it seems to only happen when reusing a curl_easy with multi_add.

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Comment By: Daniel Stenberg (bagder)
Date: 2008-04-27 14:11

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Uhm, I can only see curlftpfs packages there? Which file is the
stand-alone sample program?

And btw, calling libcurl 7.18.0 by SONAME *3* is a hack as libcurl is now
on SONAME 4.

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Comment By: Steven Shiau (steven_shiau)
Date: 2008-04-27 03:38

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Same problem here.
I put the stand-alone sample program here:
http://www.stevenshiau.org/misc/curlftpfs/
I used the curlftpfs codes from svn on code.google.com and complied it on
Ubuntu 8.04. Some version info:
--------------------------
kernel 2.6.24-16-generic
curl 7.18.0-1ubuntu
libcurl3 7.18.0-1ubuntu
--------------------------

Thanks in advance.

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Comment By: Daniel Stenberg (bagder)
Date: 2008-04-26 23:34

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Can you provide us with a stand-alone example code that shows this
problem? This could just as well be a curlftpfs problem for all we know...

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Comment By: Dan Fandrich (dfandrich)
Date: 2008-04-25 19:07

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Is this the same problem as discussed here:
http://curl.haxx.se/mail/archive-2008-02/0018.html and
http://curl.haxx.se/mail/lib-2008-02/0108.html ?

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Received on 2008-04-29