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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<div class="SECT1">
<h1 class="SECT1"><a name="SMB">2.12. SAMBA and <b class=
"APPLICATION">LPRng</b></a></h1>
<p>The SMB network protocol is used by many Microsoft
Operating Systems to implement file and printer sharing.
SAMBA is a UNIX package that implements the SMB protocol and
provides a simple and easy way to import and export file
systems and printer facilities. The web site for SAMBA is <a
href="http://www.samba.org" target=
"_top">http://www.samba.org</a>. The SAMBA code is extremely
easy to install and the <span class="ACRONYM">SWAT</span>
(Samba Web Administration Tool) makes configuration almost
trivial.</p>
<p>The See the SAMBA <tt class=
"FILENAME">doc/text/Printing.txt</tt> and related
documentation for details on printing. In the <tt class=
"FILENAME">samba.conf</tt> file <tt class=
"LITERAL">[global]</tt> section or in the SWAT page for
printing configuration you need to specify the that you want
to have Samba handle printing, the <tt class=
"LITERAL">print</tt>, <b class="APPLICATION">lpq</b>, and <b
class="APPLICATION">lprm</b> commands to be used when a user
prints a job, asks for status, or removes a job, and a
temporary directory to hold print jobs when they are
submitted. The following is a simple example of to set up
printing for authenticated users.</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1343"></a>
<pre class="SCREEN">
[printers]
path = /var/spool/lpd/samba
# --- do not use the Samba default path = /tmp
print ok = yes
printing = lprng
load printers = yes
guest ok = no
printcap name = /etc/printcap
print command = /usr/bin/lpr -P%p -r %s
lpq command = /usr/bin/lpq -P%p
lprm command = /usr/bin/lprm -P%p %j
lppause command = /usr/sbin/lpc hold %p %j
lpresume command = /usr/sbin/lpc release %p %j
queuepause command = /usr/sbin/lpc -P%p stop
queueresume command = /usr/sbin/lpc -P%p start
</pre>
</div>
<br>
<br>
<ol type="1">
<li>
<p>Samba will make a copy of the files to be printed in
the directory specified by <tt class="LITERAL">path</tt>.
If the print operation fails then sometimes the print
file is left in the directory.</p>
</li>
<li>
<p>The directory should have the same ownership and
permissions as <tt class="FILENAME">/tmp</tt>, i.e.-
owner and group <tt class="LITERAL">root</tt> and <tt
class="LITERAL">bin</tt>, with <tt class=
"LITERAL">01777</tt> permissions, where <tt class=
"LITERAL">01000</tt> is the sticky bit.</p>
<p>A directory whose `sticky bit' is set becomes an
append-only directory, or, more accurately, a directory
in which the deletion of files is re- stricted. A file in
a sticky directory may only be removed or renamed by a
user if the user has write permission for the directory
and the user is the owner of the file, the owner of the
directory, or the super-user. This feature is usefully
applied to directories such as /tmp which must be
publicly writable but should deny users the license to
arbitrarily delete or rename each others' files.</p>
</li>
<li>
<p>The directory should be examined periodically and
files older then a day should be removed. The following
command can be used to do this, and should be put in a
file that is periodically (one a day) executed by the <b
class="APPLICATION">cron</b> facility:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1360"></a>
<pre class="SCREEN">
find /var/spool/lpd/samba -type f -mtime 2d -exec rm -f {} \;
</pre>
</div>
<br>
<br>
</li>
<li>
<p>You must specify the print method as <tt class=
"LITERAL">printing = lprng</tt>. This will allow Samba to
parse the <b class="APPLICATION">LPRng</b> <b class=
"APPLICATION">lpq</b> status format correctly.</p>
</li>
<li>
<p>You must put all of the printers which Samba has
access to in the <tt class="FILENAME">printcap</tt> file.
Your Samba server may support reading the printcap file
by using a program. In this case the printcap file entry
can be one of the following:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1370"></a>
<pre class="SCREEN">
[printers]
#
printcap name = |/usr/local/libexec/filters/getpc
# or
printcap name = |/usr/bin/lpc client all
#!/bin/sh
# getpc program
/usr/bin/lpq -as | /bin/sed -e 's/[@:].*//p'
</pre>
</div>
<br>
<br>
<p>The <tt class="LITERAL">lpc client all</tt> command
will generate the printcap entries for all of the
printers. This was done to support Samba and other
printer gateway systems. You can also use a simple script
to modify the output of the printer status command as
shown in the example.</p>
</li>
<li>
<p>Samba can be configured to allow guests or
non-authenticated users to spool print jobs.
Unfortunately, by default <b class="APPLICATION">lpr</b>
will mark the jobs as submitted by the Samba server, not
the remote users. To solve this problem, the <tt class=
"COMMAND">lpr -U%U@%M</tt> option causes <b class=
"APPLICATION">lpr</b> to mark the jobs as submitted by
user <tt class="LITERAL">%U</tt> on host <tt class=
"LITERAL">%M</tt>, instead of the Samba server process.
The use of this option is restricted to root and a set of
userids listed in the <a href=
"allowusersetting.htm">allow_user_setting</a>
configuration option. If the userid of the submitter is
not in this list, then the option is quietly ignored. The
<tt class="COMMAND">-U%U@M</tt> can also be used with the
other LPRng commands as well. For example:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN1383"></a>
<pre class="SCREEN">
[printers]
guest ok = yes
print command = /usr/bin/lpr -U%U@%M -P%p -r %s
lpq command = /usr/bin/lpq -U%U@%M -P%p
lprm command = /usr/bin/lprm -U%U@%M -P%p %j
lppause command = /usr/sbin/lpc -U%U@%M hold %p %j
lpresume command = /usr/sbin/lpc -U%U@%M release %p %j
queuepause command = /usr/sbin/lpc -U%U@%M -P%p stop
queueresume command = /usr/sbin/lpc -U%U@%M -P%p start
</pre>
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