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examples: improve NetworkManager dispatcher script

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When no default route is configured, check each source if it has a
route. If the system has multiple network interfaces, this prevents
setting local NTP servers to offline when they can still be reached over
one of the interfaces.
This commit is contained in:
Miroslav Lichvar 2017-08-03 16:13:05 +02:00
parent 2b6ea41062
commit ae82bbbace
1 changed files with 26 additions and 8 deletions
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34
examples/chrony.nm-dispatcher
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@ -1,17 +1,35 @@
#!/bin/sh
# This is a NetworkManager dispatcher script for chronyd to set its NTP sources
# online/offline when a default route is configured/removed on the system.
# online or offline when a network interface is configured or removed
export LC_ALL=C
if [ "$2" = "up" ]; then
/sbin/ip route list dev "$1" | grep -q '^default' &&
/usr/bin/chronyc online > /dev/null 2>&1
# Check if there is a default route
if /sbin/ip route list 2> /dev/null | grep -q '^default'; then
chronyc online > /dev/null 2>&1
exit 0
fi
if [ "$2" = "down" ]; then
/sbin/ip route list | grep -q '^default' ||
/usr/bin/chronyc offline > /dev/null 2>&1
fi
sources=$(chronyc -c -n sources 2> /dev/null)
[ $? -ne 0 ] && exit 0
# Check each configured source if it has a route
echo "$sources" | while IFS=, read mode state address rest; do
[ "$mode" != '^' ] && [ "$mode" != '=' ] && continue
/sbin/ip route get "$address" > /dev/null 2>&1 && command="online" || command="offline"
# Set priority of sources so that the selected source is set as
# last if offline to avoid unnecessary reselection
[ "$state" != '*' ] && priority=1 || priority=2
echo "$priority $command $address"
done | sort | while read priority command address; do
echo "$command $address"
done | chronyc > /dev/null 2>&1
exit 0