cups-lpd - receive print jobs and report printer status to lpd clients
cups-lpd [ -h hostname[:port] ] [ -n ] [ -o option=value ]
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) or xinetd(8). If you are using inetd,
add the following line to the inetd.conf file to enable the cups-lpd
printer stream tcp nowait lp /usr/lib/cups/daemon/cups-lpd cups-lpd \
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:
socket_type = stream
protocol = tcp
wait = no
user = lp
group = sys
server = /usr/lib/cups/daemon/cups-lpd
server_args = -o document-format=application/octet-stream
Sets the CUPS server (and port) to use.
Disables reverse address lookups; normally cups-lpd will try to
discover the hostname of the client via a reverse DNS lookup.
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 autodetection of the print file format.
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
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 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 on your system.
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
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.
cups(1), cupsd(8), inetconv(1m), inetd(8), xinetd(8),
Copyright 2007-2009 by Apple Inc.