cups-lpd(8)

cups-lpd(8)                Apple Inc.                 cups-lpd(8)

NAME

     cups-lpd - receive print jobs and report printer  status  to
     lpd clients

SYNOPSIS

     cups-lpd [ -n ] [ -o option=value ]

DESCRIPTION

     cups-lpd is the CUPS Line Printer Daemon ("LPD") mini-server
     that  supports legacy client systems that use the LPD proto-
     col. cups-lpd does not act as a  standalone  network  daemon
     but  instead  operates  using  the  Internet  "super-server"
     inetd(8) or xinetd(8). If you are using inetd, add the  fol-
     lowing  line  to  the inetd.conf file to enable the cups-lpd
     mini-server:

         printer stream tcp nowait lp /usr/lib/cups/daemon/cups-lpd cups-lpd \
             -o document-format=application/octet-stream

     Note: If you are using Solaris 10 or higher,  you  must  run
     the  inetdconv(1m)  program  to  register the changes to the
     inetd.conf file.

     If you are using the newer xinetd(8) daemon, create  a  file
     named /etc/xinetd.d/cups containing the following lines:

         service printer
         {
             socket_type = stream
             protocol = tcp
             wait = no
             user = lp
          group = sys
          passenv =
             server = /usr/lib/cups/daemon/cups-lpd
          server_args = -o document-format=application/octet-stream
         }

OPTIONS

     -n
          Disables reverse  address  lookups;  normally  cups-lpd
          will  try  to discover the hostname of the client via a
          reverse DNS lookup.

     -o name=value
          Inserts options for all print queues. Most  often  this
          is  used to disable the "l" filter so that remote print
          jobs are filtered as needed for printing; the  examples
          in  the  previous  section  set  the  "document-format"
          option to "application/octet-stream" which forces auto-
          detection of the print file format.

24 April 2006Last change: Common UNIX Printing System           1

cups-lpd(8)                Apple Inc.                 cups-lpd(8)

PERFORMANCE

     cups-lpd performs well with small  numbers  of  clients  and
     printers.  However,  since a new process is created for each
     connection and since each process must  query  the  printing
     system  before  each  job  submission,  it does not scale to
     larger configurations. We highly recommend that large confi-
     gurations  use  the  native  IPP  support  provided  by CUPS
     instead.

SECURITY

     cups-lpd currently does not perform any access control based
     on the settings in cupsd.conf(5) or in the hosts.allow(5) or
     hosts.deny(5) files used by TCP wrappers. Therefore, running
     cups-lpd on your server will allow any computer on your net-
     work (and perhaps the entire  Internet)  to  print  to  your
     server.

     While xinetd has built-in access control support, you should
     use  the  TCP wrappers package with inetd to limit access to
     only those computers that should be able  to  print  through
     your server.

     cups-lpd is not enabled by the standard  CUPS  distribution.
     Please  consult  with your operating system vendor to deter-
     mine whether it is enabled on your system.

COMPATIBILITY

     cups-lpd does not enforce the restricted source port  number
     specified  in  RFC  1179, as using restricted ports does not
     prevent  users  from  submitting  print  jobs.  While   this
     behavior is different than standard Berkeley LPD implementa-
     tions, it should not affect normal client operations.

     The output of the status requests follows RFC 2569,  Mapping
     between  LPD  and  IPP Protocols. Since many LPD implementa-
     tions stray from this definition, remote status reporting to
     LPD clients may be unreliable.

SEE ALSO

     cups(1), cupsd(8), inetconv(1m), inetd(8), xinetd(8),
     http://localhost:631/help

COPYRIGHT

     Copyright 2007 by Apple Inc.

24 April 2006Last change: Common UNIX Printing System           2