Posted by Julien Biezemans on 05/22/06 18:45

I just wanted to share my experience: the wrappers do the job very well.

I have built a wrapper which jails local file streams to a specific
directory. This allows the following behavior:

<?php
$fh = fopen('/catalog/main.xml', 'r');
?>

Actually opens up '/srv/app_root/catalog/main.xml'. Internal functions
are authorized to open non jailed files by using the dynamic
free.file-XX:// stream scheme (where XX are changing figures). This
prevents XML document to refer to out-of-jail documents within Xinclude
elements or other proprietary stuffs.

As libxml PHP extension makes use of streams:

<?php
DOMDocument::load('/catalog/main.xml');
?>

Does work too, that's really nice.

Remember that I had to upgrade from PHP 5.1.2 to 5.1.4 to prevent
strange segfaults in the wrappers.

Maybe this can inspire someone.

Julien.

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