sonar6

Usage

Overview

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:

--visual visual

Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.

--window

Draw on a newly-created window. This is the default.

--root

Draw on the root window.

--window-id number

Draw on the specified window.

--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 IPv4 address.

subnet

Ping the local subnet. On systems where we can determine the local network mask, we use that; otherwise, we assume Class C (254 hosts).

subnet/NN

Ping a different-sized local subnet: e.g., subnet/28 would ping a 4-bit subnet (the nearest 14 addresses). On systems where we can determine the local network mask, we always use that.

A.B.C.D/NN

Ping an arbitrary other IPv4 subnet. The address specifies the base address, and the part after the slash is how wide the subnet is. Typical values are /24 (for 254 addresses) and /28 (for 14 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.

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.)

Installation

For this program to be able to ping other hosts, it must have the ability to open ICMP sockets, which requires that it be setuid root. 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

Environment

DISPLAY

to get the default host and display number.

XENVIRONMENT

to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.

XSCREENSAVER_WINDOW

The window ID to use with --root.