man/cups-lpd.man.in

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   2 .\" cups-lpd man page for CUPS.
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  13 .TH cups-lpd 8 "CUPS" "3 June 2014" "Apple Inc."
  14 .SH NAME
  15 cups-lpd \- receive print jobs and report printer status to lpd clients
  16 .SH SYNOPSIS
  17 .B cups-lpd
  18 [
  19 \fB\-h \fIhostname\fR[\fB:\fIport\fR]
  20 ] [
  21 .B -n
  22 ] [
  23 .B -o
  24 .I option=value
  25 ]
  26 .SH DESCRIPTION
  27 .B cups-lpd
  28 is the CUPS Line Printer Daemon ("LPD") mini-server that supports legacy client systems that use the LPD protocol.
  29 .B cups-lpd
  30 does not act as a standalone network daemon but instead operates using any of the Internet "super-servers" such as
  31 .BR inetd (8),
  32 .BR launchd (8),
  33 and
  34 .BR systemd (8).
  35 .SH OPTIONS
  36 .TP 5
  37 \fB-h \fIhostname\fR[\fB:\fIport\fR]
  38 Sets the CUPS server (and port) to use.
  39 .TP 5
  40 .B -n
  41 Disables reverse address lookups; normally
  42 .B cups-lpd
  43 will try to discover the hostname of the client via a reverse DNS lookup.
  44 .TP 5
  45 \fB-o \fIname=value\fR
  46 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
  47 .BR inetd (8)
  48 example below sets the "document-format" option to "application/octet-stream" which forces autodetection of the print file format.
  49 .SH CONFORMING TO
  50 .B cups-lpd
  51 does not enforce the restricted source port number specified in RFC 1179, as using restricted ports does not prevent users from submitting print jobs.
  52 While this behavior is different than standard Berkeley LPD implementations, it should not affect normal client operations.
  53 .LP
  54 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.
  55 .SH ERRORS
  56 Errors are sent to the system log.
  57 .SH FILES
  58 .nf
  59 .I /etc/inetd.conf
  60 .I /etc/xinetd.d/cups-lpd
  61 .I /System/Library/LaunchDaemons/org.cups.cups-lpd.plist
  62 .fi
  63 .SH NOTES
  64 .SS PERFORMANCE
  65 .B cups-lpd
  66 performs well with small numbers of clients and printers.
  67 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.
  68 We highly recommend that large configurations use the native IPP support provided by CUPS instead.
  69 .SS SECURITY
  70 .B cups-lpd
  71 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.
  72 Therefore, running
  73 .B cups-lpd
  74 on your server will allow any computer on your network (and perhaps the entire
  75 Internet) to print to your server.
  76 .LP
  77 While
  78 .BR xinetd (8)
  79 has built-in access control support, you should use the TCP wrappers package with
  80 .BR inetd (8)
  81 to limit access to only those computers that should be able to print through your server.
  82 .LP
  83 .B cups-lpd
  84 is not enabled by the standard CUPS distribution.
  85 Please consult with your operating system vendor to determine whether it is enabled by default on your system.
  86 .SH EXAMPLE
  87 If you are using
  88 .BR inetd (8),
  89 add the following line to the \fIinetd.conf\fR file to enable the
  90 .B cups-lpd
  91 mini-server:
  92 .nf
  93
  94     printer stream tcp nowait lp /usr/lib/cups/daemon/cups\-lpd cups\-lpd \\
  95         \-o document\-format=application/octet\-stream
  96
  97 .fi
  98 .LP
  99 \fINote:\fR If you are using Solaris 10 or higher, you must run the
 100 .BR inetdconv (1m)
 101 program to register the changes to the \fIinetd.conf\fR file.
 102 .LP
 103 CUPS includes configuration files for
 104 .BR launchd (8),
 105 .BR systemd (8),
 106 and
 107 .BR xinetd(8).
 108 Simply enable the
 109 .B cups-lpd
 110 service using the corresponding control program.
 111 .SH SEE ALSO
 112 .BR cups (1),
 113 .BR cupsd (8),
 114 .BR inetconv (1m),
 115 .BR inetd (8),
 116 .BR launchd (8),
 117 .BR xinetd (8),
 118 CUPS Online Help (http://localhost:631/help),
 119 RFC 2569
 120 .SH COPYRIGHT
 121 Copyright \[co] 2007-2015 by Apple Inc.