NAME¶
sonar - display a sonar scope
SYNOPSIS¶
sonar [-ping
hosts-or-subnets] [-ping-timeout
int] [-delay
usecs] [-speed
ratio] [-sweep-size
ratio] [-font-size
points] [-team-a-name
string] [-team-b-name
string]
[-team-a-count
int] [-team-b-count
int] [-no-dns] [-no-times]
[-no-wobble] [-debug] [-fps]
DESCRIPTION¶
This draws a sonar screen that pings (get it?) the hosts on your local network,
and plots their distance (response time) from you. The three rings represent
ping times of approximately 2.5, 70 and 2,000 milliseconds respectively.
Alternately, it can run a simulation that doesn't involve hosts.
OPTIONS¶
sonar understands the following options:
- -ping hosts-or-subnets
- The list of things to ping, separated by commas or spaces.
Elements of this list may be:
- simulation
- Run in simulation mode instead of pinging real hosts.
- hostname
- Ping the given host.
- A.B.C.D
- Ping the given IP address.
- subnet
- Ping the local class C subnet (the nearest 255
addresses).
- subnet/NN
- Ping a different-sized local subnet: e.g., subnet/28
would ping a 4-bit subnet (the nearest 15 addresses).
- A.B.C.D/NN
- 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
- 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 or second element on each line. If you use ssh,
try this:
sonar -ping $HOME/.ssh/known_hosts
- -ping-timeout int
- The amount of time in milliseconds the program will wait
for an answer to a ping.
- -delay int
- Delay between frames, in microseconds. Default 20000.
- -speed ratio
- Less than 1 for slower, greater than 1 for faster. Default
1.
- -sweep-size ratio
- How big the glowing sweep area should be. Default 0.3.
- -font-size points
- How large the text should be. Default 10 points.
- -no-wobble
- Keep the display stationary instead of very slowly wobbling
back and forth.
- -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, polygon count, and CPU
load.
NOTES¶
On most Unix systems, this program must be installed as setuid root in order to
ping hosts. This is because root privileges are needed to create an ICMP RAW
socket. Privileges are disavowed shortly after startup (just after connecting
to the X server) so this is believed to be safe:
chown root:root sonar
chmod u+s sonar
It is not necessary to make it setuid on MacOS systems, because on MacOS,
unprivileged programs can ping by using ICMP DGRAM sockets 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 © 2000-2008 by Jamie Zawinski <jwz@jwz.org> Copyright
© 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 documentation. No
representations are made about the suitability of this software for any
purpose. It is provided "as is" without express or implied warranty.
AUTHORS¶
Stephen Martin <smartin@canada.com>, 3-nov-1998.
Subnet support, etc. added by Jamie Zawinski, 17-Jul-2000.
Rewritten using OpenGL instead of X11 by Jamie Zawinski, 12-Aug-2008.
