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<!DOCTYPE html>
<html>
<head>
<title>ProFTPD: Supported FTP Commands</title>
</head>
<body bgcolor=white>
<hr>
<center><h2><b>ProFTPD: Supported FTP Commands</b></h2></center>
<hr>
<p>
<b>Supported FTP Commands</b><br>
<ul>
<li><a name="ABOR"><b><code>ABOR</code></b></a><br>
</li>
<p>
<li><a name="ALLO"><b><code>ALLO</code></b></a><br>
Short for <b>ALLO</b>cate.<br>
</li>
<p>
<li><a name="APPE"><b><code>APPE</code></b></a><br>
Short for <b>APPE</b>nd.<br>
</li>
<p>
<li><a name="AUTH"><b><code>AUTH</code></b></a><br>
Short for <b>AUTH</b>enticate (supported by <a href="../contrib/mod_tls.html"><code>mod_tls</code></a>)<br>
</li>
<p>
<li><a name="CDUP"><b><code>CDUP</code></b></a><br>
Short for <b>C</b>hange <b>D</b>irectory <b>UP</b>, this command is used
to move the client's &quot;location&quot; on the server up one level in
the filesystem hierarchy.<br>
</li>
<p>
<li><a name="CLNT"><b><code>CLNT</code></b></a><br>
Short for <b>CL</b>ie<b>NT</b>, this command is used by clients to
offer/provide any freeform identification they desire to the server.
</li>
<p>
<li><a name="CSID"><b><code>CSID</code></b></a><br>
Short for <b>C</b>lient/<b>S</b>server <b>ID</b>entification, this command
is used by clients and servers to offer/provide identification information
to the other side.
</li>
<p>
<li><a name="CWD"><b><code>CWD</code></b></a><br>
Short for <b>C</b>hange <b>W</b>orking <b>D</b>irectory.<br>
</li>
<p>
<li><a name="DELE"><b><code>DELE</code></b></a><br>
Short for <b>DELE</b>te, this command is used by the client to tell the
server to delete a file.<br>
</li>
<p>
<li><a name="EPRT"><b><code>EPRT</code></b></a><br>
Short for <b>E</b>xtended <b>P</b>o<b>RT</b>, an enhanced version of
the <a href="#PORT"><code>PORT</code></a> command that can handle IPv6
addresses.<br>
</li>
<p>
<li><a name="EPSV"><b><code>EPSV</code></b></a><br>
Short for <b>E</b>xtended <b>P</b>a<b>S</b>si<b>V</b>e, an enhanced
version of the <a href="#PASV"><code>PASV</code></a> command that can
handle IPv6 addresses.<br>
</li>
<p>
<li><a name="FEAT"><b><code>FEAT</code></b></a><br>
Short for <b>FEAT</b>ures, this command is used by the client to request
a descriptive list of server-supported features.<br>
</li>
<p>
<li><a name="HASH"><b><code>HASH</code></b></a><br>
This command is used by clients to request the checksum, or "hash", of
a file on the server. This command is available when the
<a href="../contrib/mod_digest.html"><code>mod_digest</code></a> module
is compiled/loaded.<br>
</li>
<p>
<li><a name="HELP"><b><code>HELP</code></b></a><br>
</li>
<p>
<li><a name="HOST"><b><code>HOST</code></b></a><br>
This command is the equivalent of HTTP's "Host" header for FTP, providing
the ability to have name-based virtual hosting.
</li>
<p>
<li><a name="LANG"><b><code>LANG</code></b></a><br>
</li>
<p>
<li><a name="LIST"><b><code>LIST</code></b></a><br>
</li>
<p>
<li><a name="MDTM"><b><code>MDTM</code></b></a><br>
Short for <b>M</b>o<b>D</b>ification <b>T</b>i<b>M</b>e, this command
is used by the client to request the modification time of a file on the
server. This command is defined formally in <a href="http://www.faqs.org/rfcs/rfc3659.html">RFC 3659</a>, and is a commonly implemented FTP command.
<i>Note</i> that this command <b>cannot</b> be used to change the
modification time of the file on the server; it only <i>reports</i> on the
file's modification time. The <a href="#MFMT"><code>MFMT</code></a>
command is used to <i>change</i> a file's modification time.<br>
</li>
<p>
<li><a name="MFMT"><b><code>MFMT</code></b></a><br>
Short for <b>M</b>odify <b>F</b>act: Last <b>M</b>odified <b>T</b>ime,
supported by <a href="../modules/mod_facts.html"><code>mod_facts</code></a>.
Some clients use this command to change the last modified timestamp on
a newly uploaded file so that the timestamp on the server matches the
timestamp of that file on the client.
</li>
<p>
<li><a name="MKD"><b><code>MKD</code></b></a><br>
Short for <b>M</b>a<b>K</b>e <b>D</b>irectory.<br>
</li>
<p>
<li><a name="MLSD"><b><code>MLSD</code></b></a><br>
Short for <b>M</b>achine <b>L</b>i<b>S</b>ting, <b>D</b>irectory, supported
by <a href="../modules/mod_facts.html"><code>mod_facts</code></a>. Unlike
the <a href="#LIST"><code>LIST</code></a> command, whose response format
was never specified, the <code>MLSD</code> command has a strictly defined
response format (see <a href="http://www.faqs.org/rfcs/rfc3659.html">RFC 3659</a> for details). This format was designed to be easily machine parseable,
for automated processing of directory listing formats; the format was also
designed to be platform-agnostic, and thus portable.
</li>
<p>
<li><a name="MLST"><b><code>MLST</code></b></a><br>
Short for <b>M</b>achine <b>L</b>i<b>ST</b>ing, supported by
<a href="../modules/mod_facts.html"><code>mod_facts</code></a>. This
command is similar to <a href="#MLSD"><code>MLSD</code></a> in that it
uses the same response format. Unlike <code>MLSD</code>, the response for a
<code>MLST</code> is sent back on the control connection rather than
using a data connection, and <b>is for a single file only</b>.
</li>
<p>
<li><a name="MODE"><b><code>MODE</code></b></a><br>
There are three mode types defined by <a href="http://www.faqs.org/rfcs/rfc969.html">RFC 959</a>; <code>proftpd</code> only supports one (<i>i.e.</i> <b>S</b>tream).
</li>
<p>
<li><a name="NLST"><b><code>NLST</code></b></a><br>
Short for <b>N</b>ame <b>L</b>i<b>ST</b>.<br>
</li>
<p>
<li><a name="NOOP"><b><code>NOOP</code></b></a><br>
Short for <b>NO OP</b>eration. This command has no functionality, and
is often used as a session keepalive mechanism.<br>
</li>
<p>
<li><a name="OPTS"><b><code>OPTS</code></b></a><br>
Short for <b>OPT</b>ion<b>S</b>. This command is used to specify
optional parameters for the command to follow the <code>OPTS</code>
command, if that command supports such optional parameters.<br>
</li>
<p>
<li><a name="PASS"><b><code>PASS</code></b></a><br>
Short for <b>PASS</b>word, the client uses this command to convey the
password of the user attempting to log into the server.<br>
</li>
<p>
<li><a name="PASV"><b><code>PASV</code></b></a><br>
Short for <b>PAS</b>si<b>V</b>e, the client uses this command to ask the
server for a port to which the client should connect, indicating a
passive data transfer.<br>
</li>
<p>
<li><a name="PBSZ"><b><code>PBSZ</code></b></a><br>
Short for <b>P</b>rotection <b>B</b>uffer <b>S</b>i<b>Z</b>e. Used
to determine the size of a buffer needed for secure handshaking (supported
by <a href="../contrib/mod_tls.html"><code>mod_tls</code></a>)<br>
</li>
<p>
<li><a name="PORT"><b><code>PORT</code></b></a><br>
The client uses this command to tell the server to what client-side port
the server should contact; use of this command indicates an active data
transfer.<br>
</li>
<p>
<li><a name="PROT"><b><code>PROT</code></b></a><br>
Short for <b>PROT</b>ection. Used to set the protection level on the
data channel (supported by
<a href="../contrib/mod_tls.html"><code>mod_tls</code></a>)<br>
</li>
<p>
<li><a name="PWD"><b><code>PWD</code></b></a><br>
Short for <b>P</b>rint <b>W</b>orking <b>D</b>irectory.<br>
</li>
<p>
<li><a name="QUIT"><b><code>QUIT</code></b></a><br>
</li>
<p>
<li><a name="RANG"><b><code>RANG</code></b></a><br>
Short for <b>RANG</b>e, this command is used by clients to request
that a specific <em>range</em> of bytes be transferred for files, including
uploads and downloads; supported by
<a href="../modules/mod_xfer.html"><code>mod_xfer</code></a> and defined by
<a href="https://tools.ietf.org/html/draft-bryan-ftp-range-08">this IETF
Draft</a>.
</li>
<p>
<li><a name="REST"><b><code>REST</code></b></a><br>
Short for <b>REST</b>art, this command is used by the client to tell the
server that it would like to restart a previous data transfer, either
upload or download.<br>
</li>
<p>
<li><a name="RETR"><b><code>RETR</code></b></a><br>
Short for <b>RETR</b>ieve, this command is used by the client to inform
the server of the file the client would like to download. On many FTP
client, this is implemented using the client-specfic &quot;get&quot;
command.<br>
</li>
<p>
<li><a name="RMD"><b><code>RMD</code></b></a><br>
Short for <b>R</b>e<b>M</b>ove <b>D</b>irectory, this command is used
to have the server delete the requested directory from its filesystem.<br>
</li>
<p>
<li><a name="RNFR"><b><code>RNFR</code></b></a><br>
Short for <b>R</b>e<b>N</b>ame <b>FR</b>om.<br>
</li>
<p>
<li><a name="RNTO"><b><code>RNTO</code></b></a><br>
Short for <b>R</b>e<b>N</b>ame <b>TO</b>.<br>
</li>
<p>
<li><a name="SITE"><b><code>SITE</code></b></a><br>
This command is used for site-specific commands. See below for descriptions
of <code>proftpd</code>'s SITE commands.<br>
</li>
<p>
<li><a name="SIZE"><b><code>SIZE</code></b></a><br>
</li>
<p>
<li><a name="SSCN"><b><code>SSCN</code></b></a><br>
Short for <b>S</b>et <b>S</b>ecured <b>C</b>lient <b>N</b>egotiation, this
non-standard command is used by FTPS clients to tell a server to use TLS
when performing a site-to-site transfer. For more details, see
<a href="http://www.raidenftpd.com/kb/kb000000037.htm">here</a>.
</li>
<p>
<li><a name="STAT"><b><code>STAT</code></b></a><br>
</li>
<p>
<li><a name="STOR"><b><code>STOR</code></b></a><br>
Short for <b>STOR</b>e, this command is used by the client to tell the
the server that the client will be uploading data for a file to stored
on the server using the filename given. On many FTP clients, this
is implemented using the client-specific &quot;put&quot; command.<br>
</li>
<p>
<li><a name="STOU"><b><code>STOU</code></b></a><br>
Short for <b>STO</b>re <b>U</b>unique, it requests that the file being
stored on the server be given a unique filename. The server chooses the
unique name for the stored file, and reports the name chosen back to
the client. On some FTP clients, this ability is enabled using the
client-specific &quot;sunique&quot; command.<br>
</li>
<p>
<li><a name="SYST"><b><code>SYST</code></b></a><br>
</li>
<p>
<li><a name="TYPE"><b><code>TYPE</code></b></a><br>
</li>
<p>
<li><a name="USER"><b><code>USER</code></b></a><br>
An FTP client uses this command to inform the server of the name of the
user requesting an FTP session.<br>
</li>
<p>
<li><a name="XCUP"><b><code>XCUP</code></b></a><br>
This is an X-variant of the <a href="#CDUP"><code>CDUP</code></a> command,
and has the same functionality.<br>
</li>
<p>
<li><a name="XCWD"><b><code>XCWD</code></b></a><br>
This is an X-variant of the <a href="#CWD"><code>CWD</code></a> command,
and has the same functionality.<br>
</li>
<p>
<li><a name="XMKD"><b><code>XMKD</code></b></a><br>
This is an X-variant of the <a href="#MKD"><code>MKD</code></a> command,
and has the same functionality.<br>
</li>
<p>
<li><a name="XPWD"><b><code>XPWD</code></b></a><br>
This is an X-variant of the <a href="#PWD"><code>PWD</code></a> command,
and has the same functionality.<br>
</li>
<p>
<li><a name="XRMD"><b><code>XRMD</code></b></a><br>
This is an X-variant of the <a href="#RMD"><code>RMD</code></a> command,
and has the same functionality.<br>
</li>
</ul>
<p>
<b>Supported <code>SITE</code> commands</b><br>
<ul>
<li><a name="SITE_CHGRP"><b><code>CHGRP</code></b></a><br>
Short for <b>CH</b>ange <b>GR</b>ou<b>P</b>.
<p>
Example:
<pre>
SITE CHGRP ftpgroup script.cgi
</pre>
</li>
<p>
<li><a name="SITE_CHMOD"><b><code>CHMOD</code></b></a><br>
Short for <b>CH</b>ange <b>MOD</b>e.
<p>
Example:
<pre>
SITE CHMOD 755 script.cgi
</pre>
</li>
<p>
<li><a name="SITE_HELP"><b><code>HELP</code></b></a><br>
</li>
<p>
<li><a name="SITE_MKDIR"><b><code>MKDIR</code></b></a><br>
Similar to the <a href="#MKD"><code>MKD</code></a> command, this
<code>SITE</code> can be used to create a directory. It will, unlike
<code>MKD</code>, also create any directories in the path that do
not exist.
<p>
Example:
<pre>
SITE MKDIR /path/to/some/dir/that/is/not/there/
</pre>
Supported by the <a href="../contrib/mod_site_misc.html"><code>mod_site_misc</code></a> module.
</li>
<p>
<li><a name="SITE_RMDIR"><b><code>RMDIR</code></b></a><br>
Similar to the <a href="#RMD"><code>RMD</code></a> command, this
<code>SITE</code> can be used to remove a directory. It will, unlike
<code>RMD</code>, also delete any files in the directory.
<p>
Example:
<pre>
SITE RMDIR /path/to/some/dir/with/files/
</pre>
Supported by the <a href="../contrib/mod_site_misc.html"><code>mod_site_misc</code></a> module.
</li>
<p>
<li><a name="SITE_SYMLINK"><b><code>SYMLINK</code></b></a><br>
Used to create a symbolic link (<i>a.k.a.</i> a symlink) from
the source path (<em>src</em>) to the destination path (<em>dest</em>).
<p>
Example:
<pre>
SITE SYMLINK src dest
</pre>
Supported by the <a href="../contrib/mod_site_misc.html"><code>mod_site_misc</code></a> module.
</li>
<p>
<li><a name="SITE_UTIME"><b><code>UTIME</code></b></a><br>
Used to update the access and modification timestamps on a file.
<p>
Example:
<pre>
SITE UTIME 200412312359 /path/to/some/file.txt
</pre>
Supported by the <a href="../contrib/mod_site_misc.html"><code>mod_site_misc</code></a> module.
</li>
</ul>
<p>
<b>Unsupported FTP Commands</b><br>
<ul>
<li><a name="ACCT"><b><code>ACCT</code></b></a><br>
Short for <b>ACC</b>oun<b>T</b><br>
</li>
<p>
<li><a name="MACB"><b><code>MACB</code></b></a><br>
Short for <b>MAC</b>intosh <b>B</b>inary. This command is not defined in
any RFC, and is something of a hack added by Apple in order to support
transfers of the resource forks of Mac files.<br>
</li>
<p>
<li><a name="REIN"><b><code>REIN</code></b></a><br>
</li>
<p>
<li><a name="SMNT"><b><code>SMNT</code></b></a><br>
</li>
<p>
<li><a name="STRU"><b><code>STRU</code></b></a><br>
Short for <b>STRU</b>cture. <code>proftpd</code> only supports a
<code>STRU</code> parameter of type <b>F</b> (for &quot;file&quot;),
and so does not support this command.<br>
</li>
</ul>
<p><a name="FAQ">
<b>Frequently Asked Questions</b>
<p><a name="MoveDirectoriesAcrossDevices">
<font color=red>Question</font>: I can use the <code>RNFR</code> and
<code>RNTO</code> commands to <i>move</i> a file, even across different
disks/mount points. And I can use <code>RNFR</code>/<code>RNTO</code> to move
a directory, <b>but</b> I <b>cannot</b> move a directory across different
disks/mount points. Is this a bug?<br>
<font color=blue>Answer</font>: No, it is not a bug. Why not? Ultimately,
it is because the FTP specifications do not guarantee (or even <i>discuss</i>)
that an FTP implementation must support renaming of directories across
mount points.
<p>
<p>
ProFTPD implements the <code>RNFR</code>/<code>RNTO</code> functionality
by using the <code>rename(2)</code> system call. And <code>rename(2)</code>
is documented to <b>not</b> work across mount points.
<p>
"But then why does it work when I rename a file across mount points?" you
ask. Good question. The answer is that for <b>files only</b>, ProFTPD
detects the <code>rename(2)</code> error for renaming across mount points,
and then <i>copies</i> the file in question to the new location, deleting
the old location when the copy completes successfully.
<p>
"Great!" you say, "Now do the same thing for directories!" Unfortunately, for
directories, the answer is not that simple. Here are some things to consider
when copying directories: what if the directory contains sockets, FIFOs,
devices, and other irregular file types which cannot be easily copied/moved?
Should copying/moving of directories automatically use root privileges in
order to preserve the ownership on files that do not belong to the logged-in
user? What if the copying/deleting of files fails in the midde: what should
then happen to the copied (and remaining) files/directories?
<p>
Since there are no easy answers as yet to the above questions, ProFTPD now
detects the <code>rename(2)</code> error for renaming across mount points
for a <b>directory</b>, and rejects the <code>RNTO</code> command, showing
something like:
<pre>
RNFR directory
350 File or directory exists, ready for destination name
RNTO /other/mount/directory
550 Rename /other/mount/directory: Is a directory
</pre>
That "Is a directory" error indicates that ProFTPD cannot rename a directory
across the mount points you requested. (That particular error message can,
and will, be made more informative.)
<p>
<hr>
<font size=2><b><i>
&copy; Copyright 2000-2022 The ProFTPD Project<br>
All Rights Reserved<br>
</i></b></font>
<hr>
</body>
</html>
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