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#!/bin/sh
#
# Copyright (C) 2010 segal.di.ubi.pt
# Copyright (C) 2020 nbembedded.com
#
# This is free software, licensed under the GNU General Public License v2.
#
get_ping_size() {
ps=$1
case "$ps" in
small)
ps="1"
;;
windows)
ps="32"
;;
standard)
ps="56"
;;
big)
ps="248"
;;
huge)
ps="1492"
;;
jumbo)
ps="9000"
;;
*)
echo "Error: invalid ping_size. ping_size should be either: small, windows, standard, big, huge or jumbo"
echo "Cooresponding ping packet sizes (bytes): small=1, windows=32, standard=56, big=248, huge=1492, jumbo=9000"
;;
esac
echo $ps
}
reboot_now() {
reboot &
[ "$1" -ge 1 ] && {
sleep "$1"
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger # Will immediately reboot the system without syncing or unmounting your disks.
}
}
watchcat_periodic() {
failure_period="$1"
force_reboot_delay="$2"
sleep "$failure_period" && reboot_now "$force_reboot_delay"
}
watchcat_restart_modemmanager_iface() {
[ "$2" -gt 0 ] && {
logger -t INFO "Resetting current-bands to 'any' on modem: \"$1\" now."
/usr/bin/mmcli -m any --set-current-bands=any
}
logger -t INFO "Reconnecting modem: \"$1\" now."
/etc/init.d/modemmanager restart
ifup "$1"
}
watchcat_restart_network_iface() {
logger -t INFO "Restarting network interface: \"$1\"."
ip link set "$1" down
ip link set "$1" up
}
watchcat_restart_all_network() {
logger -t INFO "Restarting networking now by running: /etc/init.d/network restart"
/etc/init.d/network restart
}
watchcat_monitor_network() {
failure_period="$1"
ping_hosts="$2"
ping_frequency_interval="$3"
ping_size="$4"
iface="$5"
mm_iface_name="$6"
mm_iface_unlock_bands="$7"
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
[ "$time_now" -lt "$failure_period" ] && sleep "$((failure_period - time_now))"
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
time_lastcheck="$time_now"
time_lastcheck_withinternet="$time_now"
ping_size="$(get_ping_size "$ping_size")"
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 "$ping_frequency_interval" ] && sleep "$((ping_frequency_interval - time_diff))"
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
time_lastcheck="$time_now"
for host in $ping_hosts; do
if [ "$iface" != "" ]; then
ping_result="$(
ping -I "$iface" -s "$ping_size" -c 1 "$host" &> /dev/null
echo $?
)"
else
ping_result="$(
ping -s "$ping_size" -c 1 "$host" &> /dev/null
echo $?
)"
fi
if [ "$ping_result" -eq 0 ]; then
time_lastcheck_withinternet="$time_now"
else
if [ "$iface" != "" ]; then
logger -p daemon.info -t "watchcat[$$]" "Could not reach $host via \"$iface\" for \"$((time_now - time_lastcheck_withinternet))\" seconds. Restarting \"$iface\" after reaching \"$failure_period\" seconds"
else
logger -p daemon.info -t "watchcat[$$]" "Could not reach $host for \"$((time_now - time_lastcheck_withinternet))\" seconds. Restarting networking after reaching \"$failure_period\" seconds"
fi
fi
done
[ "$((time_now - time_lastcheck_withinternet))" -ge "$failure_period" ] && {
if [ "$mm_iface_name" != "" ]; then
watchcat_restart_modemmanager_iface "$mm_iface_name" "$mm_iface_unlock_bands"
fi
if [ "$iface" != "" ]; then
watchcat_restart_network_iface "$iface"
else
watchcat_restart_all_network
fi
/etc/init.d/watchcat start
}
done
}
watchcat_ping() {
failure_period="$1"
force_reboot_delay="$2"
ping_hosts="$3"
ping_frequency_interval="$4"
ping_size="$5"
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
[ "$time_now" -lt "$failure_period" ] && sleep "$((failure_period - time_now))"
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
time_lastcheck="$time_now"
time_lastcheck_withinternet="$time_now"
ping_size="$(get_ping_size "$ping_size")"
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 "$ping_frequency_interval" ] && sleep "$((ping_frequency_interval - time_diff))"
time_now="$(cat /proc/uptime)"
time_now="${time_now%%.*}"
time_lastcheck="$time_now"
for host in $ping_hosts; do
if [ "$iface" != "" ]; then
ping_result="$(
ping -I "$iface" -s "$ping_size" -c 1 "$host" &> /dev/null
echo $?
)"
else
ping_result="$(
ping -s "$ping_size" -c 1 "$host" &> /dev/null
echo $?
)"
fi
if [ "$ping_result" -eq 0 ]; then
time_lastcheck_withinternet="$time_now"
else
logger -p daemon.info -t "watchcat[$$]" "Could not reach $host for $((time_now - time_lastcheck_withinternet)). Rebooting after reaching $failure_period"
fi
done
[ "$((time_now - time_lastcheck_withinternet))" -ge "$failure_period" ] && reboot_now "$force_reboot_delay"
done
}
mode="$1"
# Fix potential typo in mode and provide backward compatibility.
[ "$mode" = "allways" ] && mode="periodic_reboot"
[ "$mode" = "always" ] && mode="periodic_reboot"
[ "$mode" = "ping" ] && mode="ping_reboot"
case "$mode" in
periodic_reboot)
watchcat_periodic "$2" "$3"
;;
ping_reboot)
watchcat_ping "$2" "$3" "$4" "$5" "$6"
;;
restart_iface)
watchcat_monitor_network "$2" "$3" "$4" "$5" "$6" "$7"
;;
*)
echo "Error: invalid mode selected: $mode"
;;
esac