blob: c3e0e60ffe513ed73b5586c6ce8d8f00d0d84b67 (
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|
#!/bin/bash
UNIT=socat-dns
default_dest=149.56.44.185
default_port=53
verify_service_availability()
{
dig . @127.0.0.1 >/dev/null 2>&1
}
service_launch_command()
{
local dest port local_port
dest=${1:-$default_dest}
case "$dest" in
'') return 1 ;;
*:*)
port=${dest#*:}
dest=${dest%%:*}
;;
*)
port=${2:-$default_port}
;;
esac
local_port=${3:-$port}
printf "socat UDP-RECVFROM:%s,fork UDP-SENDTO:%s\n" "$local_port" "$dest:$port"
}
####
watchdog()
{
PID=$1
VERIFY=$2
TWO_MILLION=2000000
SLEEP_TIME=$(( ${WATCHDOG_USEC:-$TWO_MILLION} / $TWO_MILLION ))
enable -f /usr/lib/bash/sleep sleep || true
while $VERIFY
do
systemd-notify --pid="$PID" WATCHDOG=1
sleep "$SLEEP_TIME"
done
}
main()
{
case "$1" in
install)
shift
COMMAND=$(service_launch_command "$@")
if systemctl is-active "$UNIT" >/dev/null
then
systemctl stop "$UNIT"
fi
systemctl reset-failed "$UNIT" 2>/dev/null
systemd-run \
--unit "$UNIT" \
--property Restart="always" \
--property WatchdogSec="5" \
-- \
"$0" watchdog "$COMMAND" verify_service_availability
;;
watchdog)
shift
watchdog $$ "$2" &
exec $1
;;
status)
systemctl status "$UNIT"
;;
monitor)
journalctl -u "$UNIT" -f
;;
*)
echo "Usage: $0 install [destination [destination port [local port]]]" >&2
echo " $0 status" >&2
exit 1
;;
esac
}
main "$@"
|
