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<!DOCTYPE html> <html> <head> <title>ProFTPD module mod_deflate</title> </head> <body bgcolor=white> <hr> <center> <h2><b>ProFTPD module <code>mod_deflate</code></b></h2> </center> <hr><br> <p> The <code>mod_deflate</code> module is designed to provide support for <code>MODE Z</code> commands, which allows FTP clients and servers to compress data for transfer. <p> This module is contained in the <code>mod_deflate.c</code> file for ProFTPD 1.3.<i>x</i>, and is not compiled by default. Installation instructions are discussed <a href="#Installation">here</a>. Detailed documentation on <code>mod_deflate</code> usage can be found <a href="#Usage">here</a>. <p> The most current version of <code>mod_deflate</code> can be found at: <pre> <a href="http://www.castaglia.org/proftpd/">http://www.castaglia.org/proftpd/</a> </pre> <h2>Author</h2> <p> Please contact TJ Saunders <tj <i>at</i> castaglia.org> with any questions, concerns, or suggestions regarding this module. <h2>Directives</h2> <ul> <li><a href="#DeflateEngine">DeflateEngine</a> <li><a href="#DeflateLog">DeflatefLog</a> </ul> <p> <hr> <h3><a name="DeflateEngine">DeflateEngine</a></h3> <strong>Syntax:</strong> DeflateEngine <em>on|off</em><br> <strong>Default:</strong> off<br> <strong>Context:</strong> server config, <code><VirtualHost></code>, <code><Global></code><br> <strong>Module:</strong> mod_deflate<br> <strong>Compatibility:</strong> 1.3.0rc1 and later <p> The <code>DeflateEngine</code> directive enables or disables the <code>mod_deflate</code> compression functionality. If set to <em>on</em>, then <code>mod_deflate</code> will advertise support for <code>MODE Z</code> compression via the <code>FEAT</code> command, and handle <code>MODE Z</code> requests appropriately. <p> <hr> <h3><a name="DeflateLog">DeflateLog</a></h3> <strong>Syntax:</strong> DeflateLog <em>path|"none"</em><br> <strong>Default:</strong> None<br> <strong>Context:</strong> server config, <code><VirtualHost></code>, <code><Global></code><br> <strong>Module:</strong> mod_deflate<br> <strong>Compatibility:</strong> 1.3.0rc1 and later <p> The <code>DeflateLog</code> directive is used to specify a log file for <code>mod_deflate</code> reporting and debugging. The <em>path</em> parameter must be the full path to the file to use for logging. Note that this path must <b>not</b> be to a world-writable directory and, unless <code>AllowLogSymlinks</code> is explicitly set to <em>on</em> (generally a bad idea), the path must <b>not</b> be a symbolic link. <p> If <em>path</em> is "none", no logging will be done at all. <p> <hr> <h2><a name="Installation">Installation</a></h2> The <code>mod_deflate</code> module is distributed with ProFTPD. Follow the usual steps for using third-party modules in ProFTPD: <pre> $ ./configure --with-modules=mod_deflate </pre> To build <code>mod_deflate</code> as a DSO module: <pre> $ ./configure --enable-dso --with-shared=mod_deflate </pre> Then follow the usual steps: <pre> $ make $ make install </pre> <p> For those with an existing ProFTPD installation, you can use the <code>prxs</code> tool to add <code>mod_deflate</code>, as a DSO module, to your existing server: <pre> $ prxs -c -i -d mod_deflate.c </pre> <p> <hr> <h2><a name="Usage">Usage</a></h2> <p> Example <code>mod_deflate</code> configuration: <pre> <IfModule mod_deflate.c> DeflateEngine on DeflateLog /var/log/proftpd/deflate.log </IfModule> </pre> <p> Sites that run <code>proftpd</code> 1.3.0 should disable sendfile use when using <code>mod_deflate</code>, as the two features do not interoperate well: <pre> <IfModule mod_deflate.c> DeflateEngine on DeflateLog /var/log/proftpd/deflate.log UseSendfile off </IfModule> </pre> <p> <b>Logging</b><br> The <code>mod_deflate</code> module supports different forms of logging. The main module logging is done via the <code>DeflateLog</code> directive. For debugging purposes, the module also uses <a href="../howto/Tracing.html">trace logging</a>, via the module-specific log channels: <ul> <li>deflate </ul> Thus for trace logging, to aid in debugging, you would use the following in your <code>proftpd.conf</code>: <pre> TraceLog /path/to/ftpd/trace.log Trace deflate:20 </pre> This trace logging can generate large files; it is intended for debugging use only, and should be removed from any production configuration. <p><a name="FAQ"> <b>Frequently Asked Questions</b><br> <p><a name="DeflateDataError"> <font color=red>Question</font>: I'm uploading a file using <code>MODE Z</code>, but the upload always fails. In the <code>DeflateLog</code>, I see: <pre> error inflating data: [-3] Data error </pre> What is going wrong? It is a <code>mod_deflate</code> bug?<br> <font color=blue>Answer</font>: The most common cause of this error is when the client is trying to upload a binary file (<i>e.g.</i> PDF, MPG, <i>etc</i>) in <a href="http://www.proftpd.org/docs/howto/ASCII.html">ASCII</a> mode. <p> If <code>MODE Z</code> is not used in cases like this, the upload succeeds, but the uploaded file on the server is corrupted. When <code>MODE Z</code> is in effect, the corruption (translation of newlines inappropriately) is detected earlier (since <code>mod_deflate</code> can't uncompress the compressed data properly, hence the report of a "Data error"), and the upload fails. <p> The solution is make sure that the client uploads (and downloads) non-ASCII files as binary files, not as ASCII files. <p> <hr> <font size=2><b><i> © Copyright 2006-2017 TJ Saunders<br> All Rights Reserved<br> </i></b></font> <hr> </body> </html>