Tribblix: manual page: cups-lpd.8

cups-lpd(8) OpenPrinting cups-lpd(8)

NAME

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

SYNOPSIS

cups-lpd [ -h hostname[:port] ] [ -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 protocol. cups-lpd
does not act as a standalone network daemon but instead operates
using any of the Internet "super-servers" such as inetd(8),
launchd(8), and systemd(8).

OPTIONS

-h hostname[:port]
Sets the CUPS server (and port) to use.

-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 inetd(8) example below sets the
"document-format" option to "application/octet-stream" which
forces autodetection of the print file format.

CONFORMING TO

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.

ERRORS

Errors are sent to the system log.

FILES

/etc/inetd.conf
/etc/xinetd.d/cups-lpd
/System/Library/LaunchDaemons/org.cups.cups-lpd.plist

NOTES

The cups-lpd program is deprecated and will no longer be supported in
a future feature release of CUPS.

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(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(8) has built-in access control support, you should use
the TCP wrappers package with inetd(8) 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 by default on your system.

EXAMPLE

If you are using inetd(8), add the following 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

CUPS includes configuration files for launchd(8), systemd(8), and
xinetd(8). Simply enable the cups-lpd service using the
corresponding control program.