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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] [-debug]

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 displays  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.,  subnet/28 would ping a 4-bit sub-
                         net (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

     -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.

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, other-
             wise, will run in simulation-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,  this  program  must  be
     installed  as  setuid  root,  so  that it can create an ICMP
     socket.

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

COPYRIGHT
     Copyright O 1998 by Stephen Martin. (smartin@canada.com)

     Permission to use, copy, modify, distribute, and  sell  this
     software  and  its  documentation  for any purpose is hereby
     granted without  fee,  provided  that  the  above  copyright
     notice  appear  in  all  copies and that both that copyright
     notice and this permission notice appear in supporting docu-
     mentation.   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 amoung 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.

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