blob: 9d414454871ec25e35469735eed90d521eb6060e (
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|
#!/bin/bash
UNIT=socat-dns
DEST=${1:-149.56.44.185}
PORT=${2:-53}
LOCAL_PORT=${3:-$PORT}
COMMAND="socat -v UDP-RECVFROM:$LOCAL_PORT,fork UDP-SENDTO:$DEST:$PORT"
verify_service_availability()
{
true
return
dig . @localhost
}
watchdog()
{
PID=$1
enable -f /usr/lib/bash/sleep sleep || true
while verify_service_availability
do
systemd-notify --pid="$PID" WATCHDOG=1
sleep $((${WATCHDOG_USEC:-2000000} / 2000000))
done
}
main()
{
case "$1" in
install)
if systemctl is-active "$UNIT" >/dev/null
then
systemctl stop "$UNIT"
fi
systemctl reset-failed "$UNIT" 2>/dev/null
systemd-run \
--unit "$UNIT" \
--property Restart="on-failure" \
--property WatchdogSec="5" \
-- \
"$0" watchdog
;;
watchdog)
watchdog $$ &
exec $COMMAND
;;
*)
echo "Usage: $0 <watchdog|install>" >&2
exit 1
;;
esac
}
main "$@"
|
