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 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.
       However,	 since a new process is created for each connection and since
       each process must query the printing system before  each	 job  submis-
       sion,  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  comput-
       ers 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 oper-
       ations.

       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)