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sonar(6)		      XScreenSaver manual		      sonar(6)

NAME
       sonar - display a sonar scope

SYNOPSIS
       sonar [-ping hosts-or-subnets] [-background color] [-sweep-color color]
       [-low-color   color]   [-scope-color   color]	[-grid-color	color]
       [-text-color  color]  [-ttl  integer]  [-font font] [-ping-timeout int]
       [-team-a-name string] [-team-b-name string] [-team-a-count int] [-team-
       b-count int] [-no-dns] [-no-times] [-debug] [-fps]

DESCRIPTION
       The  sonar  program  displays  a	 sonar scope on the computer's screen.
       This scope polls a sensor as the sweep goes around the scope  and  dis‐
       plays  what  it finds as bogies on the screen.  The program is designed
       to support different modes representing	different  types  of  sensors.
       Currently  the  only implemented sensors are a simulator, and a network
       ping function that pings hosts and plots the results on the scope.

OPTIONS
       sonar understands the following options:

       -background Color
	       The background Color of the screen not covered by the scope.

       -sweep-color Color
	       The color of the brightest part of the sweep.

       -scope-color Color
	       The color of the circular part of the scope.

       -grid-color Color
	       The color to the grid lines overlaying the scope.

       -text-color Color
	       The color of the text identifying bogies on the scope.

       -ttl integer
	       "Time to live": visible time of a Bogie. Try values between  10
	       (very short) and 100.

       -font font
	       The font used to display text on the scope.  Default "fixed".

       -ping-timeout int
	       The amount of time in milliseconds the program will wait for an
	       answer to a ping.

       -ping hosts-or-subnets
	       The list of things to ping,  separated  by  commas  or  spaces.
	       Elements of this list may be:

	       simulation  to  run in simulation mode, instead of pinging real
			   hosts (this is the default if the  program  is  not
			   installed setuid);

	       hostname	   to ping the given host;

	       A.B.C.D	   to ping the given IP address;

	       subnet	   to  ping  the local class C subnet (the nearest 255
			   addresses);

	       subnet/NN   to ping a different-sized local subnet: e.g.,  sub‐
			   net/28  would  ping	a 4-bit subnet (the nearest 15
			   addresses);

	       A.B.C.D/NN  to ping an arbitrary other subnet: the  IP  address
			   specifies  the base address, and the part after the
			   slash is how wide the subnet	 is.   Typical	values
			   are	/24  (for  255	addresses)  and	 /28  (for  15
			   addresses.)

	       filename	   to ping the hosts listed in the given  file.	  This
			   file can be in the format used by /etc/hosts, or it
			   can be any file that has host names	as  the	 first
			   element on each line.  If you use ssh, try this:

			     sonar -ping $HOME/.ssh/known_hosts

       -no-dns Do not attempt to resolve IP addresses to hostnames.

       -no-times
	       Do not display ping times beneath the host names.

       -team-a-name string
	       In simulation mode, the name of team A.

       -team-b-name string
	       In simulation mode, the name of team B.

       -team-a-count int
	       In simulation mode, the number of bogies on team A.

       -team-b-count int
	       In simulation mode, the number of bogies on team B.

       -fps    Display the current frame rate and CPU load.

RESOURCES
       Configuration  of  the  targets	to  ping  is  best  done  by setting X
       Resources.

       background (Color)
	       See option -background, above; default value is black.

       sweepColor (Color)
	       See option -sweep-color, above; default value is #00ff00.

       scopeColor (Color)
	       See option -scope-color, above; default value is #003300.

       gridColor (Color)
	       See option -grid-color, above; default value is #00aa00.

       textColor (Color)
	       See option -text-color, above; default value is #ffff00.

       ttl (integer)
	       See option -ttl, above; default value is 90 or one sweep.

       ping (string)
	       See option -ping, above.	 If set to default, it will  ping  the
	       contents of /etc/hosts if possible, otherwise, will run in sim‐
	       ulation-mode.

       font (font)
	       See option -font, above; default value is fixed.

       pingTimeout (Integer)
	       See option -pingtimeout, above; default value is 3000.

       teamAName string
	       See option -team-a-name, above.	Default value is F18.

       teamBName string
	       See option -teamBName, above.  Default value is MIG.

       teamACount int
	       See option -teamACount, above.  Default value is 4.

       teamBCount int
	       See option -teamBCount, above.  Default value is 4.

NOTES
       In order to use the ping sensor on most systems, this program  must  be
       installed  as  setuid  root,  so that it can create an ICMP RAW socket.
       Root privileges are disavowed shortly after startup  (just  after  con‐
       necting	to  the X server and reading the resource database) so this is
       believed to be a safe thing to do, but it is usually  recommended  that
       you  have as few setuid programs around as possible, on general princi‐
       ples.
       chown root:root sonar
       chmod u+s sonar
       It is not necessary to make it setuid  on  MacOS	 systems,  because  on
       those systems, unprivileged programs can ping by using ICMP DGRAM sock‐
       ets instead of ICMP RAW.

       In ping-mode, the display is a logarithmic scale,  calibrated  so  that
       the three rings represent ping times of approximately 2.5, 70 and 2,000
       milliseconds respectively.

       This means that if any the hosts you are pinging	 take  longer  than  2
       seconds	to respond, they won't show up; and if you are pinging several
       hosts with very fast response times, they will all appear close to  the
       center of the screen (making their names hard to read.)

SEE ALSO
       X(1), xscreensaver(1), ping(8)

COPYRIGHT
       Copyright  ©  1998  by Stephen Martin. <smartin@canada.com> Copyright ©
       2000-2004 by Jamie Zawinski <jwz@jwz.org>

       Permission to use, copy, modify, distribute, and sell this software and
       its  documentation  for any purpose is hereby granted without fee, pro‐
       vided that the above copyright notice appear in	all  copies  and  that
       both  that  copyright  notice and this permission notice appear in sup‐
       porting documentation.  No representations are made about the suitabil‐
       ity  of	this software for any purpose.	It is provided "as is" without
       express or implied warranty.

AUTHORS
       Stephen Martin <smartin@canada.com>, 3-nov-98.

       Thanks to Tom Kelly for suggesting a modular  approach  to  the	sensor
       among other things.

       Thomas	Bahls	<thommy@cs.tu-berlin.de>   hacked  the	"ttl"  option,
       12-jul-98.

       Better subnet support and command-line processing  by  Jamie  Zawinski,
       17-Jul-00.

X Version 11		      5.07 (10-Aug-2008)		      sonar(6)
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