Is there a way to locate PHP files within a source tree that have been encoded using Zend Guard?
There are existing questions about attempting to decode Zend-encoded files, but I've inherited a large PHP app that must be using a Zend-encoded file somewhere in some remote library because I keep getting the following output in my application's error log:
//Copyright UserScape, Inc. 2005-2008
<html><body>
<a href="http://www.zend.com/products/zend_guard">
<img border="0" src="http://www.zend.com/images/store/safeguard_optimizer_img.gif" align="right">
</a>
<center><h1>Zend Optimizer not installed</h1></center>
<p>This file was encoded by the
<a href="http://www.zend.com/products/zend_guard">Zend Guard</a>.
In order to run it, please install the
<a href="http://www.zend.com/products/zend_optimizer">Zend Optimizer</a>
(available without charge), version 3.0.0 or later. </p>
<h2>Seeing this message instead of the website you expected?</h2>
This means that this webserver is not configured correctly.
In order to view this website properly, please contact the
website's system administrator/webmaster with the following
message:<br><br>
<tt>The component "Zend Optimizer" is not installed on the
Web Server and therefore cannot service encoded files.
Please download and install the Zend Optimizer (available
without charge) on the Web Server.</tt><br><br>
<b>Note</b>: Zend Technologies cannot resolve issues related
to this message appearing on websites not belonging to
<a href="http://www.zend.com">Zend Technologies</a>.
<h2>What is the Zend Optimizer?</h2>
<p>The Zend Optimizer is one of the most popular PHP plugins
for performance-improvement, and has been available without
charge, since the early days of PHP 4. It improves performance
by scanning PHP's intermediate code and passing it through
multiple Optimization Passes to replace inefficient code
patterns with more efficient code blocks. The replaced code
blocks perform exactly the same operations as the original
code, only faster. </p>
<p>In addition to improving performance, the Zend Optimizer
also enables PHP to transparently load files encoded by the
Zend Guard. </p>
<p>The Zend Optimizer is a free product available for download
from <a href="http://www.zend.com">Zend Technologies</a>.
Zend Technologies also developed the PHP scripting engine,
known as the <a href="http://www.zend.com/products/zend_engine">Zend Engine</a>.</p>
</body></html>
I have no idea where this file is in the app! I've been unable to locate any information on characteristics of files that have been encoded by Zend Guard, so I don't know what to search the filesystem for. Google has been unhelpful. Simple greps for "userscape" "helpspot" (apparently a product of UserScape) and even "zend" come up blank.
EDIT: However, according to the FAQ Zend Guard uses public key crypto, so I'm fairly sure the files won't have any recognizable PHP code in them anyway.
Is there a generic way to locate Zend Guard-encoded PHP files in a filesystem? Are there common properties of the files that are searchable?
I believe most Zend Optimizer encoded files will begin with a header resembling:
<?php @Zend;
They will also contain all of the text that you're seeing in the error message, including the words "Zend Optimizer". So you can just search for that. :)