Adding upstream version 4.5.upstream/4.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 856 insertions, 0 deletions

diff --git a/contrib/andrew_bishop_1 b/contrib/andrew_bishop_1
new file mode 100644
index 0000000..4c0b437
--- /dev/null
+++ b/contrib/andrew_bishop_1
@@ -0,0 +1,114 @@
+From amb@gedanken.demon.co.uk Tue Aug 17 22:14:00 1999
+Date: Fri, 6 Aug 1999 19:00:24 +0100
+From: Andrew M. Bishop <amb@gedanken.demon.co.uk>
+To: richard@rrbcurnow.freeserve.co.uk
+Subject: Re: Chrony and laptop configuration
+
+Hi,
+
+Attached is the apmd_proxy script from the apmd-3.0beta9 distribution.
+
+The changes that I would make are the following:
+
+Replace the update_clock function (line 122) with 
+
+update_clock () {
+
+chronyd -f /etc/chrony.conf
+
+}
+
+Around line 171 (in the suspend actions section) I would kill chronyd.
+
+begin 644 apmd_proxy.gz
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+>Z]AB9"M2/=L.+(S7D<0S_V\81H;_`M>*^#$A)0``
+`
+end
+
+-- 
+Andrew.
+----------------------------------------------------------------------
+Andrew M. Bishop                             amb@gedanken.demon.co.uk
+                                      http://www.gedanken.demon.co.uk/
+
diff --git a/contrib/andrew_bishop_2 b/contrib/andrew_bishop_2
new file mode 100644
index 0000000..d3ede74
--- /dev/null
+++ b/contrib/andrew_bishop_2
@@ -0,0 +1,95 @@
+From amb@gedanken.demon.co.uk Wed Sep  1 22:26:59 1999
+Date: Thu, 19 Aug 1999 17:30:14 +0100
+From: Andrew M. Bishop <amb@gedanken.demon.co.uk>
+To: richard@rrbcurnow.freeserve.co.uk
+Subject: [amb@gedanken.demon.co.uk: Chrony and laptop configuration]
+
+Hi,
+
+What you need to do is replace 10.0.0.0 with the network of the
+freeserve nameservers in the two scripts below.
+
+Other than that you can use it as is.
+
+------- Start of forwarded message -------
+From: "Andrew M. Bishop" <amb@gedanken.demon.co.uk>
+To: richard@rrbcurnow.freeserve.co.uk
+Subject: Chrony and laptop configuration
+Date: Sat, 31 Jul 1999 11:02:04 +0100
+
+Attached are the ip-up and ip-down files that I use for chrony.
+(Actually because of the way that debian works they are separate file
+in the /etc/ppp/ip-up.d directory that are run in a SysV init style).
+
+They rely on the presence of an 'ipparam demon' or 'ipparam freeserve'
+line in the PPP options file.
+
+-------------------- /etc/ppp/ip-up --------------------
+#!/bin/sh -f
+#
+# A script to start chrony
+#
+
+PPP_IPPARAM="$6"
+
+if [ $PPP_IPPARAM = "demon" ]; then
+
+   /usr/local/bin/chronyc << EOF
+password xxxxxxx
+online 255.255.255.0/158.152.1.0
+online 255.255.255.0/194.159.253.0
+EOF
+
+fi
+
+if [ $PPP_IPPARAM = "freeserve" ]; then
+
+   /usr/local/bin/chronyc << EOF
+password xxxxxxx
+online 255.255.255.0/10.0.0.0
+EOF
+
+fi
+-------------------- /etc/ppp/ip-up --------------------
+
+-------------------- /etc/ppp/ip-down --------------------
+#!/bin/sh -f
+#
+# A script to stop chrony
+#
+
+PPP_IPPARAM="$6"
+
+if [ $PPP_IPPARAM = "demon" ]; then
+
+   /usr/local/bin/chronyc << EOF
+password xxxxxxx
+offline 255.255.255.0/158.152.1.0
+offline 255.255.255.0/194.159.253.0
+EOF
+
+fi
+
+if [ $PPP_IPPARAM = "freeserve" ]; then
+
+   /usr/local/bin/chronyc << EOF
+password xxxxxxx
+offline 255.255.255.0/10.0.0.0
+EOF
+
+fi
+-------------------- /etc/ppp/ip-down --------------------
+
+-- 
+Andrew.
+----------------------------------------------------------------------
+Andrew M. Bishop                             amb@gedanken.demon.co.uk
+                                      http://www.gedanken.demon.co.uk/
+------- End of forwarded message -------
+
+-- 
+Andrew.
+----------------------------------------------------------------------
+Andrew M. Bishop                             amb@gedanken.demon.co.uk
+                                      http://www.gedanken.demon.co.uk/
+
diff --git a/contrib/bryan_christianson_1/README.txt b/contrib/bryan_christianson_1/README.txt
new file mode 100644
index 0000000..05bdd0c
--- /dev/null
+++ b/contrib/bryan_christianson_1/README.txt
@@ -0,0 +1,103 @@
+Notes for installing chrony on macOS
+Author: Bryan Christianson (bryan@whatroute.net)
+------------------------------------------------
+
+These files are for those admins/users who would prefer to install chrony
+from the source distribution and are intended as guidelines rather than
+being definitive. They can be edited with a plain text editor, such as
+vi, emacs or your favourite IDE (Xcode)
+
+It is assumed you are comfortable with installing software from the
+terminal command line and know how to use sudo to acquire root access.
+
+If you are not familiar with the macOS command line then
+please consider using ChronyControl from http://whatroute.net/chronycontrol.html
+
+ChronyControl provides a gui wrapper for installing these files and sets the
+necessary permissions on each file.
+
+
+Install the chrony software
+---------------------------
+
+You will need xcode and the commandline additions to build and install chrony.
+These can be obtained from Apple's website via the App Store.
+
+cd to the chrony directory
+./configure
+make
+sudo make install
+
+chrony is now installed in default locations (/usr/local/sbin/chronyd,
+/usr/local/bin/chronyc)
+
+Create a chrony.conf file - see the chrony website for details
+
+The support files here assume the following directives are specified in the
+chrony.conf file
+
+keyfile /etc/chrony.d/chrony.keys
+driftfile /var/db/chrony/chrony.drift
+bindcmdaddress /var/db/chrony/chronyd.sock
+logdir /var/log/chrony
+dumpdir /var/db/chrony
+
+Install this file as /etc/chrony.d/chrony.conf and create
+the directories specified in the above directives if they don't exist.
+You will need root permissions to create the directories.
+
+
+Running chronyd
+---------------
+At this point chronyd *could* be run as a daemon. Apple discourage running
+daemons and their preferred method uses the launchd facility. The
+support files here provide a launchd configuration file for chronyd and also
+a shell script and launchd configuration file to rotate the chronyd logs on a daily basis.
+
+
+Support files
+-------------
+Dates and sizes may differ
+-rw-r--r--  1 yourname  staff  2084  4 Aug 22:54 README.txt
+-rwxr-xr-x  1 yourname  staff   676  4 Aug 21:18 chronylogrotate.sh
+-rw-r--r--  1 yourname  staff   543 18 Jul 20:10 org.chrony-project.chronyc.plist
+-rw-r--r--  1 yourname  staff   511 19 Jun 18:30 org.chrony-project.chronyd.plist
+
+If you have used chrony support directories other than those suggested, you
+will need to edit each file and make the appropriate changes.
+
+
+Installing the support files
+----------------------------
+
+1. chronylogrotate.sh
+This is a simple shell script that deletes old log files. Unfortunately because
+of the need to run chronyc, the standard macOS logrotation does not work with
+chrony logs.
+
+This script runs on a daily basis under control of launchd and should be
+installed in the /usr/local/bin directory
+
+sudo cp chronylogrotate.sh /usr/local/bin
+sudo chmod +x /usr/local/bin/chronylogrotate.sh
+sudo chown root:wheel /usr/local/bin/chronylogrotate.sh
+
+
+2. org.chrony-project.chronyc.plist
+This file is the launchd plist that runs logrotation each day. You may
+wish to edit this file to change the time of day at which the rotation
+will run, currently 04:05 am
+
+sudo cp org.chrony-project.chronyc.plist /Library/LaunchDaemons
+sudo chown root:wheel /Library/LaunchDaemons/org.chrony-project.chronyc.plist
+sudo chmod 0644 /Library/LaunchDaemons/org.chrony-project.chronyc.plist
+sudo launchctl load -w /Library/LaunchDaemons/org.chrony-project.chronyc.plist
+
+
+3. org.chrony-project.chronyd.plist
+This file is the launchd plist that runs chronyd when the Macintosh starts.
+
+sudo cp org.chrony-project.chronyd.plist /Library/LaunchDaemons
+sudo chown root:wheel /Library/LaunchDaemons/org.chrony-project.chronyd.plist
+sudo chmod 0644 /Library/LaunchDaemons/org.chrony-project.chronyd.plist
+sudo launchctl load -w /Library/LaunchDaemons/org.chrony-project.chronyd.plist
diff --git a/contrib/bryan_christianson_1/chronylogrotate.sh b/contrib/bryan_christianson_1/chronylogrotate.sh
new file mode 100755
index 0000000..f919544
--- /dev/null
+++ b/contrib/bryan_christianson_1/chronylogrotate.sh
@@ -0,0 +1,58 @@
+#!/bin/sh
+
+#  chronyd/chronyc - Programs for keeping computer clocks accurate.
+#
+#  **********************************************************************
+#  * Copyright (C) Bryan Christianson  2015
+#  *
+#  * This program is free software; you can redistribute it and/or modify
+#  * it under the terms of version 2 of the GNU General Public License as
+#  * published by the Free Software Foundation.
+#  *
+#  * This program is distributed in the hope that it will be useful, but
+#  * WITHOUT ANY WARRANTY; without even the implied warranty of
+#  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#  * General Public License for more details.
+#  *
+#  * You should have received a copy of the GNU General Public License along
+#  * with this program; if not, write to the Free Software Foundation, Inc.,
+#  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#  *
+#  **********************************************************************
+
+LOGDIR=/var/log/chrony
+
+rotate () {
+  prefix=$1
+
+  rm -f $prefix.log.10
+
+  for (( count=9; count>= 0; count-- ))
+  do
+    next=$(( $count+1 ))
+    if [ -f $prefix.log.$count ]; then
+      mv $prefix.log.$count $prefix.log.$next
+    fi
+  done
+
+  if [ -f $prefix.log ]; then
+    mv $prefix.log $prefix.log.0
+  fi
+}
+
+if [ ! -e "$LOGDIR" ]; then
+  logger -s "missing directory: $LOGDIR"
+  exit 1
+fi
+
+cd $LOGDIR
+
+rotate measurements
+rotate statistics
+rotate tracking
+
+#
+# signal chronyd via chronyc
+/usr/local/bin/chronyc cyclelogs > /dev/null
+
+exit $?
\ No newline at end of file
diff --git a/contrib/bryan_christianson_1/org.chrony-project.chronyc.plist b/contrib/bryan_christianson_1/org.chrony-project.chronyc.plist
new file mode 100644
index 0000000..94cee17
--- /dev/null
+++ b/contrib/bryan_christianson_1/org.chrony-project.chronyc.plist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>Label</key>
+	<string>org.chrony-project.logrotate</string>
+	<key>KeepAlive</key>
+	<false/>
+	<key>ProgramArguments</key>
+	<array>
+		<string>/bin/sh</string>
+		<string>/usr/local/bin/chronylogrotate.sh</string>
+	</array>
+	<key>StartCalendarInterval</key>
+	<dict>
+		<key>Minute</key>
+		<integer>5</integer>
+		<key>Hour</key>
+		<integer>4</integer>
+	</dict>
+</dict>
+</plist>
diff --git a/contrib/bryan_christianson_1/org.chrony-project.chronyd.plist b/contrib/bryan_christianson_1/org.chrony-project.chronyd.plist
new file mode 100644
index 0000000..e23fc06
--- /dev/null
+++ b/contrib/bryan_christianson_1/org.chrony-project.chronyd.plist
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>Label</key>
+	<string>org.chrony-project.chronyd</string>
+	<key>Program</key>
+	<string>/usr/local/sbin/chronyd</string>
+	<key>ProgramArguments</key>
+	<array>
+		<string>chronyd</string>
+		<string>-n</string>
+		<string>-f</string>
+		<string>/private/etc/chrony.d/chrony.conf</string>
+	</array>
+	<key>KeepAlive</key>
+	<true/>
+</dict>
+</plist>
diff --git a/contrib/erik_bryer_1 b/contrib/erik_bryer_1
new file mode 100644
index 0000000..c551dfe
--- /dev/null
+++ b/contrib/erik_bryer_1
@@ -0,0 +1,65 @@
+#!/bin/sh
+#
+# chrony        Start time synchronization. This script
+#               starts chronyd.
+#
+# Hacked by:    Erik Bryer <ebryer@spots.ab.ca> using inet as a template
+#
+# chkconfig: 2345 02 82
+# description: chronyd helps keep the system time accurate by calculating \
+#              and applying correction factors to compensate for the drift \
+#              in the clock. chronyd can also correct the hardware clock \
+#              (RTC) on some systems.
+# processname: chronyd
+# config: /etc/chrony.conf
+
+# Source function library.
+. /etc/rc.d/init.d/functions
+
+# Source networking configuration.
+. /etc/sysconfig/network
+
+# Set path to include chronyd in /usr/local/sbin
+PATH="$PATH:/usr/local/sbin"
+
+[ -f /usr/local/sbin/chronyd ] || exit 0
+
+[ -f /etc/chrony.conf ] || exit 0
+
+RETVAL=0
+
+# See how we were called.
+case "$1" in
+  start)
+        # Start daemons.
+        echo -n "Starting chronyd: "
+        daemon chronyd
+	RETVAL=$?
+ 	[ $RETVAL -eq 0 ] && touch /var/lock/subsys/chrony
+	echo
+        ;;
+  stop)
+        # Stop daemons.
+        echo -n "Shutting down chronyd: "
+# If not dead killproc automatically sleeps for 4.1 seconds then does 
+# kill -9. "chrony.txt" prefers a 5 second delay, but this should be ok.
+        killproc chronyd -15
+	RETVAL=$?
+	[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/chrony
+        echo
+        ;;
+  status)
+	status chronyd
+	exit $?
+	;;
+  restart)
+	$0 stop
+	$0 start
+	;;
+  *)
+        echo "Usage: named {start|stop|status|restart}"
+        exit 1
+esac
+
+exit $RETVAL
+
diff --git a/contrib/ken_gillett_1 b/contrib/ken_gillett_1
new file mode 100644
index 0000000..48b7999
--- /dev/null
+++ b/contrib/ken_gillett_1
@@ -0,0 +1,100 @@
+#!/bin/sh
+#
+# chronyd      This shell script takes care of starting and stopping
+#              chronyd (NTP daemon).
+#
+# chkconfig: 45 80 20
+# description: chronyd is the NTP daemon.
+
+# Source function library.
+. /etc/rc.d/init.d/functions
+
+# Source networking configuration.
+. /etc/sysconfig/network
+
+# Check that networking is up.
+[ ${NETWORKING} = "no" ] && exit 0
+
+PREDIR="/usr/local"
+CHRONYD=$PREDIR"/sbin/chronyd"
+CHRONYC=$PREDIR"/bin/chronyc"
+
+[ -x $CHRONYD -a -x $CHRONYC -a -f /etc/chrony.conf ] || exit 0
+
+dochrony() {
+	if [ -z "$(pidofproc chronyd)" ]; then
+		echo -e "\n\tchronyd not running\n\n"
+		exit 2
+	fi
+	KEY=`awk '$1 == "commandkey" {print $2; exit}' /etc/chrony.conf`
+	PASSWORD=`awk '$1 == '$KEY' {print $2; exit}' /etc/chrony/keys`
+
+	$CHRONYC <<- EOF
+		password $PASSWORD
+		$@
+		quit
+	EOF
+}
+
+# make the first parameter' lower case
+set - `echo $1 | awk '{print tolower($1)}';shift;echo "$@"`
+
+# Expand any shortcuts.
+case "$1" in
+   on|1)
+	set - "online"
+	;;
+   off|0)
+	set - "offline"
+esac
+
+# See how we were called.
+case "$1" in
+   start)
+         # Start daemons.
+         echo -n "Starting chronyd: "
+         daemon $CHRONYD
+	if [ $? -eq 0 ]; then
+		echo $(pidofproc chronyd) > /var/run/chronyd.pid
+		touch /var/lock/subsys/chronyd
+	fi
+         echo
+         ;;
+   stop)
+         # Stop daemons.
+         echo -n "Shutting down chronyd: "
+	killproc chronyd
+         echo
+         rm -f /var/lock/subsys/chronyd
+         ;;
+   status)
+	status chronyd
+	;;
+   restart|reload)
+	$0 stop
+	$0 start
+	;;
+   condrestart)
+	if [ -f /var/lock/subsys/chronyd ]; then
+		$0 stop
+		$0 start
+	fi
+	;;
+   "")
+	echo "Usage: chronyd 
+{start|stop|restart|reload|condrestart|status|[on|off]line etc}"
+	exit 1
+	;;
+ 
+accheck|cmdaccheck|clients|manual|rtcdata|sources|sourcestats|tracking|clients)
+	dochrony "$@"
+	;;
+   *)
+         echo -n "Chrony $1: "
+	dochrony "$@" > /dev/null
+	[ $? -eq 0 ] && echo_success || echo_failure
+	echo
+esac
+
+exit 0
+
diff --git a/contrib/stephan_boettcher_1 b/contrib/stephan_boettcher_1
new file mode 100644
index 0000000..e5eda11
--- /dev/null
+++ b/contrib/stephan_boettcher_1
@@ -0,0 +1,162 @@
+From stephan@nevis1.nevis.columbia.edu Mon Jun  7 20:51:57 1999
+Date: 04 Jun 1999 00:17:25 -0400
+From: Stephan I. Boettcher <stephan@nevis1.nevis.columbia.edu>
+To: richard@rrbcurnow.freeserve.co.uk
+Subject: chrony 1.1 sysV startup script for notebooks
+
+
+Dear Richard,
+
+I installed chrony on my notebook, running RedHat 5.1 Linux.
+It looks like it works.  No problems.
+
+Thank you!
+
+I like to donate my sysV startup script, appended below.
+
+Special feature:  the `online' command scans the config file to
+selectively turn some servers online, depending on the pcmcia SCHEME.
+
+booting:                 /etc/rc.d/init.d/chrony start
+/etc/ppp/ip-up:          /etc/rc.d/init.d/chrony online
+/etc/ppp/ip-down:        /etc/rc.d/init.d/chrony offline
+logrotate cron:          /etc/rc.d/init.d/chrony cyclelogs
+a user:                  /etc/rc.d/init.d/chrony status
+a sysadmin:              /etc/rc.d/init.d/chrony restart
+shutdown:                /etc/rc.d/init.d/chrony stop
+
+Best regards
+Stephan
+
+-- 
+
+------------------------------------------------------------------------
+Stephan Boettcher                                   FAX: +1-914-591-4540
+Columbia University, Nevis Labs                     Tel: +1-914-591-2863
+P.O. Box 137, 136 South Broadway      mailto:stephan@nevis1.columbia.edu
+Irvington, NY 10533, USA          http://www.nevis.columbia.edu/~stephan
+------------------------------------------------------------------------
+
+########################### cut here ###################################
+#! /bin/bash
+#
+#  /etc/rc.d/init.d/chrony
+#
+#  SYS V startup script for  
+#  chrony ntp daemon 
+#  on Linux 2.0.3x notebooks with pcmcia scheme support
+#  $Id: stephan_boettcher_1,v 1.1 2000/04/24 21:36:04 richard Exp $
+#
+#  1999-06-02 SiB <stephan@nevis1.columbia.edu>
+#
+# For PCMCIA users:
+# In /etc/chrony.conf, precede the server commands for each SCHEME 
+# with a comment line that contains the word SCHEME and the name of
+# the scheme(s) that should use the servers, up to the next line that
+# contains the word SCHEME.  The servers must be `offline' and 
+# specified by their IP address.  The hostname will not do.
+#
+# Like:
+#
+#	# SCHEME nevisppp nevislan
+#	#       stephanpc.nevis.columbia.edu
+#	server  192.12.82.222   offline
+#
+#	# SCHEME desyppp desylan
+#
+#	#       dsygw2.desy.de
+#	server  131.169.30.15   offline
+#	#       dscomsa.desy.de
+#	server  131.169.197.35  offline
+
+CONF=/etc/chrony.conf
+CHRONYD=/usr/local/sbin/chronyd
+CHRONYC=/usr/local/bin/chronyc
+KEYS=/etc/chrony.keys
+
+# See if we got all we need:
+
+[ -f $CHRONYD -a -f $CHRONYC -a -r $CONF ] || exit
+
+
+[ -r $KEYS ]							\
+&& CMDKEY=`awk '/^commandkey/{print $2}' $CONF`			\
+&& PASSWORD=`awk -v KEY=$CMDKEY '$1==KEY{print $2}' $KEYS`
+
+
+case "$1" in
+
+  start)
+	echo -n "Starting chronyd "
+        $CHRONYD -r -s -f $CONF
+        echo
+        ;;
+
+  stop)
+        echo -n "Shutting down chronyd "
+	/usr/bin/killall chronyd
+        echo
+        ;;
+
+  restart)
+	$0 stop
+	$0 start
+	;;
+
+  on*)
+
+	[ -f /var/run/pcmcia-scheme ] && SCHEME=`cat /var/run/pcmcia-scheme`
+
+	awk  -v SCHEME=${SCHEME:-default}  -v PASSWORD=$PASSWORD  \
+		'
+		BEGIN { 
+			SEL=1;
+			print "password", PASSWORD; 
+		}
+		/SCHEME/ { 
+			SEL=match($0, SCHEME); 
+		}
+		SEL && /^server[ \t]*[0-9.]+[ \t].*offline/ { 
+			print "online 255.255.255.255/"  $2; 
+		}
+		'	\
+		$CONF	\
+	| $CHRONYC
+
+	;;
+
+  off*)
+	cat <<-EOF | $CHRONYC
+		password $PASSWORD
+		offline
+		trimrtc
+		dump
+		EOF
+	;;
+
+  *log*)
+	cat <<-EOF | $CHRONYC
+		password $PASSWORD
+		cyclelogs
+		EOF
+	;;
+
+  stat*)
+	cat <<-EOF | $CHRONYC
+		sources
+		sourcestats
+		tracking
+		rtcdata
+		EOF
+	;;
+
+  *)
+        echo "Usage: chronyd {start|stop|restart|status|online|offline|cyclelogs}"
+        exit 1
+	;;
+
+esac
+
+exit 0
+
+
diff --git a/contrib/wolfgang_weisselberg1 b/contrib/wolfgang_weisselberg1
new file mode 100644
index 0000000..2c41752
--- /dev/null
+++ b/contrib/wolfgang_weisselberg1
@@ -0,0 +1,118 @@
+
+> Is it possible to limit chronyc to only those commands that
+> are readonly plus those necessary to bring a dialup connection up
+> and down? That is: online offline dump writertc and password.
+
+This is trivial on the same host and workable for non-local
+hosts: use a wrapper program or script.  An *untested*
+sample follows.  To use it, best create a special user (say
+chronyc) and a special group (say chronyg).  Make the script
+chronyc:chronyg, and 4750 (suid, rwxr-x---).  Add all users
+who may run the script to the group chronyg.
+
+Make a chrony password file e.g.
+/usr/local/etc/chrony_password.  It should be owned by chronyc
+and readable only for the owner, containing only the chrony
+password (and maybe a newline) in the first line.
+
+In this way only the script (call it run_chrony, for example)
+can read the password.  It will allow only those commands you
+explicitely allow.  You can add a password check -- especially
+if you add an internet port so you can access it over the
+internet this is advisable.  You really want to add logging
+to this untested script as well.
+
+
+BTW, if you use some sort of PPP, you probably can use
+/etc/ppp/ip-up and /etc/ppp/ip-down to transparently set chrony
+on- and offline as the ip connection goes up and comes down.
+This is _far_ more user friendly, IMHO, and a DOS by switching
+chrony offline all the time is avoided as well.
+
+
+#! /usr/bin/perl -T
+use v5.6.1;
+use warnings;
+use strict;
+
+sub laundered_command();
+sub order_chrony($$);
+sub read_password();
+sub usage($);
+
+our $CHRONY = "/usr/local/bin/chronyc";
+
+# NOTE: select the file system protection wisely for the
+# PASSWORDFILE!
+our $PASSWORDFILE = "/usr/local/etc/chrony_password";
+
+our @ALLOWED_COMMANDS = (
+    'online',                 # switch online mode on
+    'offline',                # switch online mode off
+    'dump',                   # save measurements to file
+    'writerc',                # save RTC accumulated data
+
+    'clients',                # which clients are served by us?
+    'rtcdata',                # Quality of RTC measurements
+    'sources(?: -v)?',        # Show our sources (verbose)
+    'sourcestats(?: -v)?',    # How good are our sources (verbose)?
+    'tracking',               # whom do we adjust to?
+
+    # 'burst \d+/\d+',          # allow them to send bursts?
+);
+
+usage("No command given.") unless $ARGV[0];
+
+%ENV = ();    # nuke all environment variables.  Rather
+              # drastic, but better safe than sorry!
+              # Add whatever you really need to get it
+              # working (again).
+$ENV{'PATH'} = '/usr/local/bin:/bin:/usr/bin';
+
+order_chrony(laundered_command(), read_password());
+
+exit 0; # command succeeded
+                        
+############################################################
+
+sub usage($) {
+    print STDERR "Error: ", shift, "\n";
+
+    # OK, this eats the -v...
+    print STDERR "Legal commands are:\n\t", join "\n",
+      map { $_ =~ m:(\w+):; $1 } @ALLOWED_COMMANDS;
+    exit 1;     # error
+}
+
+############################################################
+
+sub laundered_command() {
+    my $regexp = "^(" . join ( "|", @ALLOWED_COMMANDS ) . ")\$";
+    my $parameters = join " ", @ARGV;
+    $parameters =~ m:$regexp: or usage("Command $parameters not allowed.");
+
+    return $1;    # this value, then, is untainted.
+};
+
+############################################################
+
+sub read_password() {
+    open PASS, $PASSWORDFILE
+      or die "Could not read protected password file: $!";
+    my $password = <PASS>;
+    chomp $password;
+    return $password;
+};
+
+############################################################
+
+sub order_chrony($$) {
+    my ($clean_command, $password) = @_;
+    open CHRONY, "| $CHRONY &> /dev/null" or die "could not run $CHRONY: $!\n";
+    print CHRONY "password $password\n";
+    print CHRONY "$clean_command\n";
+    close CHRONY
+      or die "Error running command $clean_command\n", "\ton $CHRONY: $!\n";
+}
+
+############################################################