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From Jon Belanger <>
Subject Re: [users@httpd] Using mod_ext_filter mode=input
Date Fri, 07 Dec 2012 21:57:35 GMT
Hi Jeff,

Thanks for the response.  I went ahead and compiled Apache 2.4 latest and that did clear the
logged error.  I'm still having trouble with the 0 file size, but I'm doing a sleep and a
cp to a unique file in the cmd script to make the content persist in the FS.  It does look
like you're correct that another request is coming in, but it must be something internal.
 I'll continue to hack at it.

Best Regards,

From: Jeff Trawick <<>>
Reply-To: "<>" <<>>
Date: Monday, November 12, 2012 1:19 PM
To: "<>" <<>>
Subject: Re: [users@httpd] Using mod_ext_filter mode=input

On Mon, Nov 12, 2012 at 9:06 AM, Jon Belanger <<>>
Does anyone still maintain this?  Any ideas?

Hi Jon,

The issue of the unexpected error (and message) matches this recent fix to trunk and 2.4.x:

 The patch looks quite simple to try with 2.2.x.  Can you how much that helps?  (I don't know
what else would happen besides the message.)

With the patch in place, I successfully ran the first example you gave, like so:

extfilterdefine tee \
  cmd="/usr/bin/tee /tmp/ext_filter_debug" \

setinputfilter tee

Is it possible that your testing showed the file going to zero because of some other request
hitting the server (with no body)?

Thank you,

From: Jon Belanger <<>>
Reply-To: "<>" <<>>
Date: Thursday, November 8, 2012 5:23 PM
To: "<>" <<>>
Subject: [users@httpd] Using mod_ext_filter mode=input

I'm trying to intercept file upload requests using the mod_ext_filter module in input mode.

I've tried a few test commands to write the STDIN to a file, for example:

/usr/bin/tee /tmp/ext_filter_debug

And also tried a test script that does basically the same thing:

cat -  > /tmp/ext_filter_debug

If I send a large file I can see the request append /tmp/ext_filter_debug file, but as soon
as the request completes, the file goes down to 0 bytes in both instances.  I don't understand
how this is even possible given that the module should have no idea what file I'm writing

Interestingly if I try this:

cat -  > /tmp/ext_filter_debug
cat /tmp/ext_filter_debug

The /tmp/ext_filter_debug file hangs out a while longer, duration depending on size, but then
eventually goes to zero.

Eventually, I want to parse the request and encrypt the uploading file using openssl smime,
but I don't understand how to work with the incoming request.  The only error I see logged

(9) Bad file descriptor: apr_file_close(child input)

To /var/log/apach2/error.log.  I tried LogLevel=debug and DebugLevel=9. LogStderr helps to
see if I have a problem in the cmd script itself, but otherwise isn't much help.

Can any provide any examples for this use case?

Thank you,
Jon Belanger

Born in Roswell... married an alien...

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