1sonar(6x)                     XScreenSaver manual                    sonar(6x)
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NAME

6       sonar - display a sonar scope
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SYNOPSIS

9       sonar  [-ping  hosts-or-subnets]  [-ping-timeout  int]  [-delay  usecs]
10       [-speed ratio] [-sweep-size ratio]  [-font-size  points]  [-team-a-name
11       string]  [-team-b-name  string] [-team-a-count int] [-team-b-count int]
12       [-no-dns] [-no-times] [-no-wobble] [-debug] [-fps]
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DESCRIPTION

15       This draws a sonar screen that pings (get it?) the hosts on your  local
16       network,  and plots their distance (response time) from you.  The three
17       rings represent ping times of approximately 2.5, 70 and 2,000 millisec‐
18       onds respectively.
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20       Alternately, it can run a simulation that doesn't involve hosts.
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OPTIONS

23       sonar understands the following options:
24
25       -ping hosts-or-subnets
26               The list of things to ping, separated by commas or spaces.  El‐
27               ements of this list may be:
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29               simulation  Run in simulation  mode  instead  of  pinging  real
30                           hosts.
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32               hostname    Ping the given host.
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34               A.B.C.D     Ping the given IPv4 address.
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36               subnet      Ping the local subnet.  On systems where we can de‐
37                           termine the local network mask, we use that; other‐
38                           wise, we assume Class C (254 hosts).
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40               subnet/NN   Ping  a  different-sized  local  subnet: e.g., sub‐
41                           net/28 would ping a 4-bit subnet  (the  nearest  14
42                           addresses).   On systems where we can determine the
43                           local network mask, we always use that.
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45               A.B.C.D/NN  Ping an arbitrary other IPv4 subnet.   The  address
46                           specifies  the base address, and the part after the
47                           slash is how wide the subnet  is.   Typical  values
48                           are  /24  (for  254  addresses) and /28 (for 14 ad‐
49                           dresses).
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51               filename    Ping the hosts listed in the given file.  This file
52                           can  be in the format used by /etc/hosts, or it can
53                           be any file that has host names  as  the  first  or
54                           second  element  on each line.  If you use ssh, try
55                           this:
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57                             sonar -ping $HOME/.ssh/known_hosts
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59       -ping-timeout int
60               The amount of time in milliseconds the program will wait for an
61               answer to a ping.
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63       -delay int
64               Delay between frames, in microseconds.  Default 20000.
65
66       -speed ratio
67               Less than 1 for slower, greater than 1 for faster.  Default 1.
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69       -sweep-size ratio
70               How big the glowing sweep area should be. Default 0.3.
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72       -font-size points
73               How large the text should be.  Default 10 points.
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75       -no-wobble
76               Keep  the  display  stationary  instead of very slowly wobbling
77               back and forth.
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79       -no-dns Do not attempt to resolve IP addresses to hostnames.
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81       -no-times
82               Do not display ping times beneath the host names.
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84       -team-a-name string
85               In simulation mode, the name of team A.
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87       -team-b-name string
88               In simulation mode, the name of team B.
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90       -team-a-count int
91               In simulation mode, the number of bogies on team A.
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93       -team-b-count int
94               In simulation mode, the number of bogies on team B.
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96       -fps    Display the current frame rate, polygon count, and CPU load.
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99       In ping-mode, the display is a logarithmic scale,  calibrated  so  that
100       the three rings represent ping times of approximately 2.5, 70 and 2,000
101       milliseconds respectively.
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103       This means that if any the hosts you are pinging  take  longer  than  2
104       seconds  to respond, they won't show up; and if you are pinging several
105       hosts with very fast response times, they will all appear close to  the
106       center of the screen (making their names hard to read.)
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108

INSTALLATION

110       For this program to be able to ping other hosts, it must have the abil‐
111       ity to open ICMP sockets, which is usually an action that requires  ad‐
112       ditional privileges.
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114       If your system has setcap(8) then this permission can be added with
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116            setcap cap_net_raw=p sonar
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118       Otherwise,  the  program  must  be  setuid root in order to ping hosts.
119       Privileges are disavowed shortly after startup (just  after  connecting
120       to the X server) so this is believed to be safe:
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122            chown root:root sonar
123            chmod u+s sonar
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125       It  is  not  necessary to use setcap or setuid on macOS systems, as un‐
126       privileged programs can ping by using ICMP  DGRAM  sockets  instead  of
127       ICMP RAW.
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BUGS

130       Does not support IPv6.
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SEE ALSO

133       X(1), xscreensaver(1), ping(8), ping6(8)
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136       Copyright © 2000-2021 by Jamie Zawinski <jwz@jwz.org>
137       Copyright © 1998 by Stephen Martin. <smartin@canada.com>
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139       Permission to use, copy, modify, distribute, and sell this software and
140       its documentation for any purpose is hereby granted without  fee,  pro‐
141       vided  that  the  above  copyright notice appear in all copies and that
142       both that copyright notice and this permission notice  appear  in  sup‐
143       porting documentation.  No representations are made about the suitabil‐
144       ity of this software for any purpose.  It is provided "as  is"  without
145       express or implied warranty.
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AUTHORS

149       Stephen Martin <smartin@canada.com>, 3-nov-1998.
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151       Subnet support, etc. added by Jamie Zawinski, 17-Jul-2000.
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153       Rewritten using OpenGL instead of X11 by Jamie Zawinski, 12-Aug-2008.
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157X Version 11               6.04-1.fc36 (06-Jun-2022)                 sonar(6x)
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