172 lines
3.7 KiB
Bash
Executable File
172 lines
3.7 KiB
Bash
Executable File
#!/bin/sh
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#
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# Manage NTP configuration.
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#
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. /opt/puzzlefw/lib/functions.sh
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# Show current configuration.
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ntpcfg_show() {
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echo "Active NTP configuration:"
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if [ -s /etc/chrony/sources.d/ntp.sources ]; then
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cat /etc/chrony/sources.d/ntp.sources
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else
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echo "disabled"
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fi
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echo
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echo "Saved NTP configuration:"
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if [ -s ${CONFIG_DIR}/ntp.sources ]; then
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cat ${CONFIG_DIR}/ntp.sources
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else
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echo "disabled"
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fi
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echo
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}
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# Check that parameter is a well-formed IPv4 address.
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check_ipaddr() {
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IFS="." read a b c d <<EOF
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$1
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EOF
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for i in "$a" "$b" "$c" "$d" ; do
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if ! [ "$i" -ge 0 -a "$i" -le 255 ]; then
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echo "ERROR: Invalid IP address '$1'" >&2
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exit 1
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fi
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done
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}
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# Configure and enable Chrony.
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ntpcfg_server() {
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if [ "$1" != "server" ]; then
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echo "ERROR: Invalid command '$1'" >&2
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exit 1
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fi
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NTPSERVER="$2"
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if [ -z "$NTPSERVER" ]; then
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echo "ERROR: Server IP address not specified" >&2
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exit 1
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fi
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check_ipaddr "$NTPSERVER"
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POLLOPTS=""
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if [ "$#" -gt 2 ]; then
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if [ "$3" != "poll" ]; then
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echo "ERROR: Unknown option '$3'" >&2
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exit 1
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fi
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POLLINT="$4"
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if [ -z "$POLLINT" ]; then
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echo "ERROR: Poll interval not specified" >&2
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exit 1
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fi
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if ! [ "$POLLINT" -ge "-1" -a "$POLLINT" -le "10" ]; then
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echo "ERROR: Invalid poll interval '$POLLINT', must be between -1 and 10" >&2
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exit 1
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fi
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POLLOPTS="minpoll $POLLINT maxpoll $POLLINT"
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if [ "$#" -gt 4 ]; then
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echo "ERROR: Unexpected option '$5'" >&2
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exit 1
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fi
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fi
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# Lock to avoid conflicting changes.
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lock_config || exit 1
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echo "Configuring Chrony to start on boot with server $NTPSERVER ..."
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SERVERLINE="server $NTPSERVER $POLLOPTS iburst prefer"
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echo "$SERVERLINE" > ${CONFIG_DIR}/ntp.sources.new
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sync_config ntp.sources || exit 1
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mkdir -p /etc/chrony/sources.d
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cp -p ${CONFIG_DIR}/ntp.sources /etc/chrony/sources.d
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echo
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echo "New NTP configuration:"
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cat /etc/chrony/sources.d/ntp.sources
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echo
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echo "Restarting Chrony ..."
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/etc/init.d/S49chrony restart
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}
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# Disable starting Chrony during boot.
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ntpcfg_disable() {
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# Lock to avoid conflicting changes.
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lock_config || exit 1
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echo "Disabling Chrony startup on boot ..."
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echo -n "" > ${CONFIG_DIR}/ntp.sources.new
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sync_config ntp.sources || exit 1
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echo "Stopping Chrony ..."
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/etc/init.d/S49chrony stop
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rm -f /etc/chrony/sources.d/ntp.sources
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}
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case "$1" in
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show)
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ntpcfg_show
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;;
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server)
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ntpcfg_server "$@"
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;;
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disable)
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ntpcfg_disable
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;;
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*)
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script="${0##*/}"
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cat <<EOF
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Usage: $script {server|disable|show}
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Manage NTP server configuration.
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$script server {IP-address} [poll N]
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Enable starting Chrony during boot and specify NTP server to use.
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Optionally, the poll interval can be specified as a power of 2 in seconds,
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for example "poll 5" means a polling interval of 32 seconds. By default,
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the poll interval starts at 6 (64 seconds) and slowly steps up to
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10 (1024 seconds).
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Sub-millisecond accuracy can be achieved with an NTP server in the local
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network and "poll 0" (poll each second).
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Do not use a poll interval shorter than 64 seconds unless the NTP server
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is in the local network. Doing this with a public NTP server is
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considered abuse.
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$script disable
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Disable starting Chrony during boot and stop Chrony if it was running.
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$script show
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Display NTP configuration.
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EOF
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exit 1
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;;
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esac
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exit $?
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