man/cups-lpd.man.in

   1 .\"
   2 .\" cups-lpd man page for CUPS.
   3 .\"
   4 .\" Copyright 2007-2014 by Apple Inc.
   5 .\" Copyright 1997-2006 by Easy Software Products.
   6 .\"
   7 .\" Licensed under Apache License v2.0.  See the file "LICENSE" for more information.
   8 .\"
   9 .TH cups-lpd 8 "CUPS" "3 June 2014" "Apple Inc."
  10 .SH NAME
  11 cups-lpd \- receive print jobs and report printer status to lpd clients
  12 .SH SYNOPSIS
  13 .B cups-lpd
  14 [
  15 \fB\-h \fIhostname\fR[\fB:\fIport\fR]
  16 ] [
  17 .B -n
  18 ] [
  19 .B -o
  20 .I option=value
  21 ]
  22 .SH DESCRIPTION
  23 .B cups-lpd
  24 is the CUPS Line Printer Daemon ("LPD") mini-server that supports legacy client systems that use the LPD protocol.
  25 .B cups-lpd
  26 does not act as a standalone network daemon but instead operates using any of the Internet "super-servers" such as
  27 .BR inetd (8),
  28 .BR launchd (8),
  29 and
  30 .BR systemd (8).
  31 .SH OPTIONS
  32 .TP 5
  33 \fB-h \fIhostname\fR[\fB:\fIport\fR]
  34 Sets the CUPS server (and port) to use.
  35 .TP 5
  36 .B -n
  37 Disables reverse address lookups; normally
  38 .B cups-lpd
  39 will try to discover the hostname of the client via a reverse DNS lookup.
  40 .TP 5
  41 \fB-o \fIname=value\fR
  42 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
  43 .BR inetd (8)
  44 example below sets the "document-format" option to "application/octet-stream" which forces autodetection of the print file format.
  45 .SH CONFORMING TO
  46 .B cups-lpd
  47 does not enforce the restricted source port number specified in RFC 1179, as using restricted ports does not prevent users from submitting print jobs.
  48 While this behavior is different than standard Berkeley LPD implementations, it should not affect normal client operations.
  49 .LP
  50 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.
  51 .SH ERRORS
  52 Errors are sent to the system log.
  53 .SH FILES
  54 .nf
  55 .I /etc/inetd.conf
  56 .I /etc/xinetd.d/cups-lpd
  57 .I /System/Library/LaunchDaemons/org.cups.cups-lpd.plist
  58 .fi
  59 .SH NOTES
  60 .SS PERFORMANCE
  61 .B cups-lpd
  62 performs well with small numbers of clients and printers.
  63 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.
  64 We highly recommend that large configurations use the native IPP support provided by CUPS instead.
  65 .SS SECURITY
  66 .B cups-lpd
  67 currently does not perform any access control based on the settings in \fIcupsd.conf(5)\fR or in the \fIhosts.allow(5)\fR or \fIhosts.deny(5)\fR files used by TCP wrappers.
  68 Therefore, running
  69 .B cups-lpd
  70 on your server will allow any computer on your network (and perhaps the entire
  71 Internet) to print to your server.
  72 .LP
  73 While
  74 .BR xinetd (8)
  75 has built-in access control support, you should use the TCP wrappers package with
  76 .BR inetd (8)
  77 to limit access to only those computers that should be able to print through your server.
  78 .LP
  79 .B cups-lpd
  80 is not enabled by the standard CUPS distribution.
  81 Please consult with your operating system vendor to determine whether it is enabled by default on your system.
  82 .SH EXAMPLE
  83 If you are using
  84 .BR inetd (8),
  85 add the following line to the \fIinetd.conf\fR file to enable the
  86 .B cups-lpd
  87 mini-server:
  88 .nf
  89
  90     printer stream tcp nowait lp /usr/lib/cups/daemon/cups\-lpd cups\-lpd \\
  91         \-o document\-format=application/octet\-stream
  92
  93 .fi
  94 .LP
  95 \fINote:\fR If you are using Solaris 10 or higher, you must run the
  96 .BR inetdconv (1m)
  97 program to register the changes to the \fIinetd.conf\fR file.
  98 .LP
  99 CUPS includes configuration files for
 100 .BR launchd (8),
 101 .BR systemd (8),
 102 and
 103 .BR xinetd (8).
 104 Simply enable the
 105 .B cups-lpd
 106 service using the corresponding control program.
 107 .SH SEE ALSO
 108 .BR cups (1),
 109 .BR cupsd (8),
 110 .BR inetconv (1m),
 111 .BR inetd (8),
 112 .BR launchd (8),
 113 .BR xinetd (8),
 114 CUPS Online Help (http://localhost:631/help),
 115 RFC 2569
 116 .SH COPYRIGHT
 117 Copyright \[co] 2007-2018 by Apple Inc.