--- /dev/null
+#!/bin/sh
+
+mode="$1"
+
+shutdown_now() {
+ local forcedelay="$1"
+
+ reboot &
+
+ [ "$forcedelay" -ge 1 ] && {
+ sleep "$forcedelay"
+
+ echo b > /proc/sysrq-trigger # Will immediately reboot the system without syncing or unmounting your disks.
+ }
+}
+
+watchcat_allways() {
+ local period="$1"; local forcedelay="$2"
+
+ sleep "$period" && shutdown_now "$forcedelay"
+}
+
+watchcat_ping() {
+ local period="$1"; local forcedelay="$2"; local pinghosts="$3"; local pingperiod="$4"
+
+ time_now="$(cat /proc/uptime)"
+ time_now="${time_now%%.*}"
+ time_last="$time_now"
+
+ while true
+ do
+ sleep "$pingperiod"
+
+ time_now="$(cat /proc/uptime)"
+ time_now="${time_now%%.*}"
+
+ for host in "$pinghosts"
+ do
+ if ping -c 1 "$host" &> /dev/null
+ then
+ time_last="$time_now"
+ else
+ time_diff="$((time_now-time_last))"
+ logger -p daemon.info -t "watchcat[$$]" "no internet connectivity for $time_diff seconds. Reseting when reaching $period"
+ fi
+ done
+
+ time_diff="$((time_now-time_last))"
+ [ "$time_diff" -ge "$period" ] && shutdown_now "$forcedelay"
+
+ done
+}
+
+ if [ "$mode" = "allways" ]
+ then
+ watchcat_allways "$2" "$3"
+ else
+ watchcat_ping "$2" "$3" "$4" "$5"
+ fi