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<!DOCTYPE html>
<html>
<head>
<title>ProFTPD module mod_facts</title>
</head>

<body bgcolor=white>

<hr>
<center>
<h2><b>ProFTPD module <code>mod_facts</code></b></h2>
</center>
<hr><br>

<p>
<b>File "Facts" Support</b><br>

<p>
The <code>mod_facts</code> module is ProFTPD's module for handling the
<code>MLSD</code> and <code>MLST</code> commands, in support of
<a href="http://www.faqs.org/rfcs/rfc3659.html">RFC 3659</a>.  In addition,
the <code>mod_facts</code> module implements the <code>MFF</code> and
<code>MFMT</code> commands defined in:
<pre>
  <a href="http://tools.ietf.org/html/draft-somers-ftp-mfxx-04">http://tools.ietf.org/html/draft-somers-ftp-mfxx-04</a>
</pre>

<p>
This module is contained in the <code>mod_facts.c</code> file for
ProFTPD 1.3.<i>x</i>, and is compiled by default.  Other installation
instructions are discussed <a href="#Installation">here</a>.

<p>
The most current version of <code>mod_facts</code> can be found in the
ProFTPD source distribution:
<pre>
  <a href="http://www.proftpd.org/">http://www.proftpd.org/</a>
</pre>

<h2>Directives</h2>
<ul>
  <li><a href="#FactsAdvertise">FactsAdvertise</a>
  <li><a href="#FactsOptions">FactsOptions</a>
</ul>

<hr>
<h3><a name="FactsAdvertise">FactsAdvertise</a></h3>
<strong>Syntax:</strong> FactsAdvertise <em>on|off</em><br>
<strong>Default:</strong> FactsAdvertise on<br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_facts<br>
<strong>Compatibility:</strong> 1.3.2rc2 and later

<p>
The <code>FactsAdvertise</code> directive is used to control whether
the <code>mod_facts</code> module advertises its <code>MLST</code> support
via the <code>FEAT</code> command.

<p>
By default, the <code>mod_facts</code> module will list <code>MLST</code>
in the <code>FEAT</code> response.  FTP clients use this to determine whether
to use the newer <code>MLSD</code>/<code>MLST</code> commands, or the older
<code>LIST</code>/<code>NLST</code> commands.  Some FTP clients, though,
will attempt to use the newer commands just as if they were equivalent to
the older commands, including supporting glob/wildcard characters.
Section 2.2.2 of RFC3659, which explicitly states that wildcard characters are
<b>not</b> supported in the <code>MLSD</code> and <code>MLST</code> commands.
Thus, to prevent problems when using such FTP clients with proftpd,
you can disable the advertising of support for those commands using
<i>e.g.</i> the following in your <code>proftpd.conf</code>:
<pre>
  &lt;IfModule mod_facts.c&gt;
    FactsAdvertise off
  &lt;/IfModule&gt;
</pre>

<hr>
<h3><a name="FactsOptions">FactsOptions</a></h3>
<strong>Syntax:</strong> FactsOptions <em>opt1 ...</em><br>
<strong>Default:</strong> None<br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_facts<br>
<strong>Compatibility:</strong> 1.3.4b and later

<p>
The <code>FactsOptions</code> directive is used to configure various optional
behavior of <code>mod_facts</code>.  <b>Note</b>: all of the configured
<code>FactsOptions</code> parameters <b>must</b> appear on the same line in the
configuration; only the <i>first</i> <code>FactsOptions</code> directive that
appears in the configuration is used.

<p>
The currently implemented options are:
<ul>
  <li><code>UseSlink</code><br>
    <p>
    Use this option to have <code>mod_facts</code> use the <i>broken</i>
    "OS.unix=slink" syntax, preferred by FTP clients such as FileZilla, for
    indicating symlinks, rather than the more correct "OS.unix=symlink"
    syntax.  See
    <a href="http://bugs.proftpd.org/show_bug.cgi?id=3318">Bug#3318</a> for
    a more detailed discussion.

    <p>
    <b>Note</b> that this option first appeared in
    <code>proftpd-1.3.4b</code>.
  </li>

  <p>
  <li><code>AdjustedSymlinks</code><br>
    <p>
    Using this option will cause <code>mod_facts</code> to try to automatically
    adjust any symlink destination paths when the FTP session is chrooted, so
    that the adjusted symlinks work properly <i>e.g.</i> for FTP clients.

    <p>
    <b>Note</b> that this option first appeared in
    <code>proftpd-1.3.7rc1</code>.
  </li>

  <p>
  <li><code>NoNames</code><br>
    <p>
    By default, <code>mod_facts</code> will automatically use the newer
    <code>UNIX.ownername</code> and <code>UNIX.groupname</code> facts in its
    <code>MLSD</code>/<code>MLST</code> responses.  But some FTP clients may
    not react well to the presence of these facts.  Use this option to disable
    to use of these facts.

    <p>
    <b>Note</b> that this option first appeared in
    <code>proftpd-1.3.6rc3</code>.
  </li>
</ul>

<p><a name="FAQ">
<b>Frequently Asked Questions</b><br>

<p><a name="FactsListOptions">
<font color=red>Question</font>: Why does <code>MLSD</code> list all of the
files in a directory, including the "hidden" files, where the <code>LIST</code>
command does not?<br>
<font color=blue>Answer</font>: The <code>MLSD</code> and <code>MLST</code>
commands do not have any notions of "options" like the <code>LIST</code> and
<code>NLST</code> commands do; there is no way for a client, in the request
to list the files in a directory, to ask the server to filter the list of
files somehow.  Instead, <code>MLSD</code> contains a list of "facts" for
each file in its list; the client then has to to decide how to filter the
list of files based on those facts.  This is why the <code>ListOptions</code>
directive has no influence over the <code>MLSD</code> and <code>MLST</code>
commands.

<p><a name="FactsUIDs">
<font color=red>Question</font>: Why does <code>MLST</code> show the UIDs/GIDs
for listed files, where <code>LIST</code>/<code>NLST</code> show the user/group
names?<br>
<font color=blue>Answer</font>: The list of "facts" defined by RFC 3659 does
<b>not</b> include a fact for the stringified version of user/group owner
names, unfortunately.  This means that the <code>MLSD</code>/<code>MLST</code>
commands do not have a good way of obtaining the user/group names.

<p>
To work around this issue, you can add the following to your
<code>proftpd.conf</code>:
<pre>
  &lt;IfModule mod_facts.c&gt;
    FactsAdvertise off
  &lt;/IfModule&gt;
</pre>
This tells <code>proftpd</code> to not advertise to the client that it can
support the <code>MLSD</code>/<code>MLST</code> commands.  The client will then
usually fall back to using the older <code>LIST</code> command, which
<i>does</i> include the file owner user/group names.

<p><a name="FactsSymlinks">
<font color=red>Question</font>: Why does FileZilla not display symlinks
properly, even though I have "ShowSymlinks on" in my <code>proftpd.conf</code>?<br>
<font color=blue>Answer</font>: Newer versions of FileZilla (and other
FTP clients) use the <code>MLSD</code> command for listing files, rather than
the older <code>LIST</code> command.  And FileZilla and the
<code>mod_facts</code> disagree on the proper syntax for indicating when a
file is a symlink.

<p>
To work around this issue, you can add the following to your
<code>proftpd.conf</code>:
<pre>
  &lt;IfModule mod_facts.c&gt;
    FactsOptions UseSlink
  &lt;/IfModule&gt;
</pre>
This tells the <code>mod_facts</code> module to use the improper
"OS.unix=slink:<i>path</i>" syntax for symlinks; this is the syntax preferred
by FileZilla (and perhaps other FTP clients). By default, the
<code>mod_facts</code> module uses the better "OS.unix=symlink" syntax.

<p>
<b>Note</b> that if you are running <code>proftpd-1.3.3</code>, however,
the <code>FactsOptions</code> directive is not supported.  To get FileZilla
to display symlinks properly for older proftpd versions, then, you would use:
<pre>
  &lt;IfModule mod_facts.c&gt;
    FactsAdvertise off
  &lt;/IfModule&gt;
</pre>
This tells the <code>mod_facts</code> module to <b>not</b> advertise that it
supports the newer <code>MLST/MLSD</code> commands.  FileZilla will then fall
back to using the older directory list commands (<i>i.e.</i> <code>LIST</code>,
<code>NLST</code>), which should show symlinks properly.

<p><a name="FactsDotfiles">
<font color=red>Question</font>: How can I hide dotfiles (<i>e.g.</i> ".msg")
from the <code>MLSD</code> command?<br>
<font color=blue>Answer</font>: There are two possible ways of dealing
with FTP clients which use the <code>MLSD</code> command for listing
directories, as opposed to the <code>LIST</code>/<code>NLST</code> commands.

<p>
Since the <code>MLSD</code> command does not have the concept of "options",
unlike <code>LIST</code>/<code>NLST</code>, the <code>ListOptions</code>
directive does not apply to <code>MLSD</code> as some would expect.  Thus
using a configuration like so:
<pre>
  ListOptions +a
</pre>
to hide dotfiles from <code>LIST</code> commands does <b>not</b> work for
<code>MLSD</code>.  How, then, to hide dotfiles from MLSD commands?  You can
configure proftpd so that it does not advertise the fact that it can support
the <code>MLSD</code> command, via:
<pre>
  &lt;IfModule mod_facts.c&gt;
    FactsAdvertise off
  &lt;/IfModule&gt;
</pre>
Alternatively, you can use the <code>HideFiles</code> and
<code>IgnoreHidden</code> directives:
<pre>
  &lt;Directory /&gt;
    # Hide files whose names start with "."
    HideFiles ^\.

    &lt;Limit LIST MLSD NLST&gt;
      # Do not include hidden files for LIST, MLSD, and NLST
      IgnoreHidden on
    &lt;/Limit&gt;
  &lt;/Directory&gt;
</pre>
This latter configuration will apply to <code>LIST</code>, <code>NLST</code>,
and <code>MLSD</code> equally.

<p><a name="FactsRemove">
<font color=red>Question</font>: How can I disable the <code>mod_facts</code>
module entirely?  Some clients (<i>e.g.</i> ncftp) do not appear to implement
<code>MLSD</code> properly, and do not honor the <code>FEAT</code> response from
<code>proftpd</code> when <code>FactsAdvertise</code> is configured
<em>off</em>.<br>
<font color=blue>Answer</font>: There is no easy way of disabling the
<code>mod_facts</code> module at present; the
<a href="#FactsAdvertise"><code>FactsAdvertise</code></a> directive is intended
to do this in a way compliant with the RFCs.

<p>
That said, you <i>can</i> compile <code>proftpd</code> such that
<code>mod_facts</code> is built as a DSO/shared module:
<pre>
  $ ./configure --enable-dso --with-shared=mod_facts ...
</pre>
and then, in your <code>proftpd.conf</code>, you simply omit any
"LoadModule mod_facts.c" directive, so that that module is never dynamically
loaded.

<p>
<hr>
<h2><a name="Installation">Installation</a></h2>
The <code>mod_facts</code> module is distributed with ProFTPD, and is
normally compiled as a static module by default.  However, if you wish to
have <code>mod_facts</code> be built as a shared module, you would use:
<pre>
  $ ./configure --enable-dso --with-shared=mod_facts ...
</pre>
Then follow the usual steps:
<pre>
  $ make
  $ make install
</pre>

<p>
<hr>
<font size=2><b><i>
&copy; Copyright 2007-2019 The ProFTPD Project<br>
 All Rights Reserved<br>
</i></b></font>
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