Manual Pages for UNIX Darwin command on man 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

ccuuppss-llppdd [ -o option=value ]

DESCRIPTION

ccuuppss-llppdd is the CUPS Line Printer Daemon ("LPD") mini-server that sup-

ports legacy client systems that use the LPD protocol. ccuuppss-llppdd does

not act as a standalone network daemon but instead operates using the

Internet "super-server" iinneettdd((88)). Add the following line to the

iinneettdd..ccoonnff file to enable the ccuuppss-llppdd 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 xxiinneettdd..ccoonnff file: service printer { sockettype = stream protocol = tcp wait = no user = lp group = sys passenv =

server = /path/to/cups/daemon/cups-lpd

serverargs = -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. OOPPTTIIOONNSS

The -o option to ccuuppss-llppdd 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

serverargs = -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.

PPEERRFFOORRMMAANNCCEE

ccuuppss-llppdd 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. SSEECCUURRIITTYY

ccuuppss-llppdd 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 ccuuppss-llppdd 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.

ccuuppss-llppdd 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. CCOOMMPPAATTIIBBIILLIITTYY

ccuuppss-llppdd 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.