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<th colspan="3" align="center">LPRng Reference Manual: 24
Sep 2004 (For LPRng-3.8.28)</th>
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<td width="80%" align="center" valign="bottom">Chapter 19.
RFC 1179 - Line Printer Daemon Protocol</td>
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<div class="SECT1">
<h1 class="SECT1"><a name="REMOTESUPPORT" id=
"REMOTESUPPORT">19.2. Protocol Requests and Replies</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">remote_support=</tt><span class=
"emphasis"><i class="EMPHASIS">Remote operations
supported</i></span></p>
</li>
</ul>
<p>After a connection has been established, a request can be
sent to the <b class="APPLICATION">lpd</b> server. The request
consists of a single octet indicating the request type,
followed by the printer (or print queue) name, followed by a
set of options for the request, followed by a LF (line feed)
character.</p>
<div class="TABLE">
<a name="RF1179COMMANDS" id="RF1179COMMANDS"></a>
<p><b>Table 19-1. RFC1179 Commands</b></p>
<table border="1" frame="border" rules="all" class=
"CALSTABLE">
<col>
<col>
<col>
<col>
<thead>
<tr>
<th>NNN</th>
<th>RFC1179</th>
<th>Operation</th>
<th>program</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>yes</td>
<td>start print</td>
<td><b class="APPLICATION">lpc</b></td>
</tr>
<tr>
<td>2</td>
<td>yes</td>
<td>transfer a printer job</td>
<td><b class="APPLICATION">lpr</b></td>
</tr>
<tr>
<td>3</td>
<td>yes</td>
<td>print short form of queue status</td>
<td><b class="APPLICATION">lpr</b></td>
</tr>
<tr>
<td>4</td>
<td>yes</td>
<td>print long form of queue status</td>
<td><b class="APPLICATION">lpr</b></td>
</tr>
<tr>
<td>5</td>
<td>yes</td>
<td>remove jobs</td>
<td><b class="APPLICATION">lprm</b></td>
</tr>
<tr>
<td>6</td>
<td><b class="APPLICATION">LPRng</b></td>
<td>do control operation</td>
<td><b class="APPLICATION">lpc</b></td>
</tr>
<tr>
<td>7</td>
<td><b class="APPLICATION">LPRng</b></td>
<td>transfer a block format print job</td>
<td><b class="APPLICATION">lpr</b></td>
</tr>
<tr>
<td>8</td>
<td><b class="APPLICATION">LPRng</b></td>
<td>secure command transfer</td>
<td><b class="APPLICATION">lpc</b></td>
</tr>
<tr>
<td>9</td>
<td><b class="APPLICATION">LPRng</b></td>
<td>verbose status information</td>
<td><b class="APPLICATION">lpr</b></td>
</tr>
</tbody>
</table>
</div>
<p>After the request has been sent, then a reply will be
returned. In general the reply has the following form:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN10156" id="AEN10156"></a>
<pre class="SCREEN">
\000\n Success
\NNN\n Failure (NNN is error code)
text\n Text or status information
</pre>
</div>
<p>As can be seen, this protocol is extremely simple, but there
are a set of problems due to the loosely written language of
RFC1179.</p>
<ol type="1">
<li>
<p>Firstly, while RFC1179 sets limits on the lengths of
commands, it does not strictly set limits on the characters
set used in the commands. This can result in problems when
trying to print status information, headers on banners, and
other details.</p>
</li>
<li>
<p>The original RFC1179 protocol did not provide any way to
do remote control of queues or <b class=
"APPLICATION">lpd</b> servers. This has been added to the
protocol. As a side effect, if you try to use <b class=
"APPLICATION">lpc</b> to control a non-<b class=
"APPLICATION">LPRng</b> printer, it will not work.</p>
</li>
<li>
<p>You can specify that a network printer is non-<b class=
"APPLICATION">LPRng</b> by using the <tt class=
"LITERAL">remote_support=RQVMC</tt> option and specify the
operations supported by the printer. The letters R, Q, M,
and C stand for <b class="APPLICATION">lpr</b>, <b class=
"APPLICATION">lpq</b>, <b class="APPLICATION">lprm</b>, and
<b class="APPLICATION">lpc</b> operations respectively, and
indicate that these are supported. If <tt class=
"LITERAL">remote_support</tt> does not allow a particular
operation, then the <b class="APPLICATION">LPRng</b>
software will not send a corresponding request to the
printer. For example, <tt class=
"LITERAL">remote_support=R</tt> would restrict operations
to spooling jobs only, and the <b class=
"APPLICATION">LPRng</b> software would not query the
printer for status.</p>
</li>
</ol>
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