cups-lpd(8)

NAME

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

SYNOPSIS

       cups-lpd [ -o option=value ]

DESCRIPTION

       cups-lpd  is the CUPS Line Printer Daemon ("LPD") mini-server that sup-
       ports legacy client systems that use the LPD protocol.   cups-lpd  does
       not  act  as a standalone network daemon but instead operates using the
       Internet  "super-server"  inetd(8).  Add  the  following  line  to  the
       inetd.conf file to enable the cups-lpd daemon:

           printer stream tcp nowait lp /path/to/cups/daemon/cups-lpd cups-lpd -o document-format=application/octet-stream

       If you are using the newer xinetd(8) daemon, add the following lines to
       the xinetd.conf file:

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

       The   /path/to/cups/daemon   is   usually    /usr/lib/cups/daemon    or
       /usr/libexec/cups/daemon,  depending  on the operating system.  Consult
       the cupsd.conf file for the local setting.

OPTIONS

       The -o option to cups-lpd 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:

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

           server = /usr/lib/cups/daemon/cups-lpd
           server_args = -o document-format=application/octet-stream

       The example shown resets the document format to  be  application/octet-
       stream, which forces auto-detection of the print file type.

PERFORMANCE

       cups-lpd performs well with small numbers of clients and printers. How-
       ever, 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
       configurations 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  files
       used  by  TCP wrappers. Therefore, running cups-lpd on your server will
       allow any computer on your network (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 con-
       sult with your operating system  vendor  to  determine  whether  it  is
       enabled in their distributions.

COMPATIBILITY

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

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

SEE ALSO

       cupsd(8),  inetd(8),  xinetd(8),  CUPS  Software Administrators Manual,
       http://localhost:631/documentation.html

COPYRIGHT

       Copyright 1993-2005 by Easy Software Products, All Rights Reserved.

11 August 2004            Common UNIX Printing System              cups-lpd(8)