cups-lpd

cups-lpd(8)                 Easy Software Products                 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
       supports 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.
       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 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
       consult 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
       submitting print jobs. While this behavior is different than standard
       Berkeley LPD implementations, 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 implementations stray from this
       definition, 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 1993-2004 by Easy Software Products, All Rights Reserved.



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