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#!/bin/sh
#
# Copyright (C) 2010 segal.di.ubi.pt
#
# This is free software, licensed under the GNU General Public License v2.
#
mode="$1"
# Fix potential typo in mode (backward compatibility).
[ "$mode" = "allways" ] && mode="always"
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_always() {
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="${time_now%%.*}"
time_lastcheck="$time_now"
time_lastcheck_withinternet="$time_now"
while true
do
# account for the time ping took to return. With a ping time of 5s, ping might take more than that, so it is important to avoid even more delay.
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
time_diff="$((time_now-time_lastcheck))"
[ "$time_diff" -lt "$pingperiod" ] && {
sleep_time="$((pingperiod-time_diff))"
sleep "$sleep_time"
}
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
time_lastcheck="$time_now"
for host in $pinghosts
do
if ping -c 1 "$host" &> /dev/null
then
time_lastcheck_withinternet="$time_now"
else
time_diff="$((time_now-time_lastcheck_withinternet))"
logger -p daemon.info -t "watchcat[$$]" "no internet connectivity for $time_diff seconds. Reseting when reaching $period"
fi
done
time_diff="$((time_now-time_lastcheck_withinternet))"
[ "$time_diff" -ge "$period" ] && shutdown_now "$forcedelay"
done
}
if [ "$mode" = "always" ]
then
watchcat_always "$2" "$3"
else
watchcat_ping "$2" "$3" "$4" "$5"
fi