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#!/bin/bash
# This script runs on after start in background
# as a service and gets restarted on failure
# it runs ALMOST every seconds
# INFOFILE - state data from bootstrap
infoFile="/home/admin/raspiblitz.info"
# CONFIGFILE - configuration of RaspiBlitz
configFile="/mnt/hdd/raspiblitz.conf"
# LOGS see: sudo journalctl -f -u background
# Check if HDD contains configuration
configExists=$(ls ${configFile} | grep -c '.conf')
if [ ${configExists} -eq 1 ]; then
source ${configFile}
else
source ${infoFile}
fi
echo "_background.sh STARTED"
counter=0
while [ 1 ]
do
###############################
# Prepare this loop
###############################
# count up
counter=$(($counter+1))
# gather the uptime seconds
upSeconds=$(cat /proc/uptime | grep -o '^[0-9]\+')
####################################################
# RECHECK DHCP-SERVER
# https://github.com/rootzoll/raspiblitz/issues/160
####################################################
# every 5 minutes
recheckDHCP=$((($counter % 300)+1))
if [ ${recheckDHCP} -eq 1 ]; then
echo "*** RECHECK DHCP-SERVER ***"
# get the local network IP
localip=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/')
echo "localip(${localip})"
# detect a missing DHCP config
if [ "${localip:0:4}" = "169." ]; then
echo "Missing DHCP detected ... trying emergency reboot"
sudo shutdown -r now
else
echo "DHCP OK"
fi
fi
####################################################
# CHECK FOR UNDERVOLTAGE REPORTS
# every 1 hour scan for undervoltage reports
####################################################
recheckUndervoltage=$(($counter % 3600))
if [ ${recheckUndervoltage} -eq 1 ]; then
echo "*** RECHECK UNDERVOLTAGE ***"
countReports=$(sudo cat /var/log/syslog | grep -c "Under-voltage detected!")
echo "${countReports} undervoltage reports found in syslog"
if [ ${#undervoltageReports} -eq 0 ]; then
# write new value to info file
undervoltageReports="${countReports}"
echo "undervoltageReports=${undervoltageReports}" >> ${infoFile}
else
# update value in info file
sed -i "s/^undervoltageReports=.*/undervoltageReports=${countReports}/g" ${infoFile}
fi
fi
####################################################
# RECHECK PUBLIC IP
# when public IP changes, restart LND with new IP
####################################################
# every 15min - not too often
# because its a ping to external service
recheckPublicIP=$((($counter % 900)+1))
updateDynDomain=0
if [ ${recheckPublicIP} -eq 1 ]; then
echo "*** RECHECK PUBLIC IP ***"
# execute only after setup when config exists
if [ ${configExists} -eq 1 ]; then
# get actual public IP
freshPublicIP=$(curl -s http://v4.ipv6-test.com/api/myip.php 2>/dev/null)
echo "freshPublicIP(${freshPublicIP})"
echo "publicIP(${publicIP})"
# sanity check on IP data
# see https://github.com/rootzoll/raspiblitz/issues/371#issuecomment-472416349
echo "-> sanity check of IP data: ${freshPublicIP}"
if [[ $freshPublicIP =~ ^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$ ]]; then
echo "OK IPv6"
elif [[ $freshPublicIP =~ ^([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$ ]]; then
echo "OK IPv4"
else
echo "FAIL - not an IPv4 or IPv6 address"
freshPublicIP=""
fi
if [ ${#freshPublicIP} -eq 0 ]; then
echo "freshPublicIP is ZERO - ignoring"
# check if changed
elif [ "${freshPublicIP}" != "${publicIP}" ]; then
# 1) update config file
echo "update config value"
sed -i "s/^publicIP=.*/publicIP=${freshPublicIP}/g" ${configFile}
publicIP=${freshPublicIP}
# 2) only restart LND if dynDNS is activated
# because this signals that user wants "public node"
if [ ${#dynDomain} -gt 0 ]; then
echo "restart LND with new environment config"
# restart and let to auto-unlock (if activated) do the rest
sudo systemctl restart lnd.service
fi
# 2) trigger update if dnyamic domain (if set)
updateDynDomain=1
else
echo "public IP has not changed"
fi
else
echo "skip - because setup is still running"
fi
fi
###############################
# LND AUTO-UNLOCK
###############################
# check every 10secs
recheckAutoUnlock=$((($counter % 10)+1))
if [ ${recheckAutoUnlock} -eq 1 ]; then
# check if auto-unlock feature if activated
if [ "${autoUnlock}" = "on" ]; then
# check if lnd is locked
locked=$(sudo -u bitcoin /usr/local/bin/lncli --chain=${network} --network=${chain}net getinfo 2>&1 | grep -c unlock)
if [ ${locked} -gt 0 ]; then
echo "STARTING AUTO-UNLOCK ..."
# building REST command
passwordC=$(sudo cat /root/lnd.autounlock.pwd)
command="sudo python /home/admin/config.scripts/lnd.unlock.py '${passwordC}'"
bash -c "${command}"
else
echo "lncli says not locked"
fi
else
echo "auto-unlock is OFF"
fi
fi
###############################
# UPDATE DYNAMIC DOMAIN
# like afraid.org
# ! experimental
###############################
# if not activated above, update every 6 hours
if [ ${updateDynDomain} -eq 0 ]; then
# dont +1 so that it gets executed on first loop
updateDynDomain=$(($counter % 21600))
fi
if [ ${updateDynDomain} -eq 1 ]; then
echo "*** UPDATE DYNAMIC DOMAIN ***"
# check if update URL for dyn Domain is set
if [ ${#dynUpdateUrl} -gt 6 ]; then
# calling the update url
echo "calling: ${dynUpdateUrl}"
echo "to update domain: ${dynDomain}"
curl --connect-timeout 6 ${dynUpdateUrl}
else
echo "'dynUpdateUrl' not set in ${configFile}"
fi
fi
###############################
# Prepare next loop
###############################
# sleep 1 sec
sleep 1
# limit counter to max seconds per week:
# 604800 = 60sec * 60min * 24hours * 7days
if [ ${counter} -gt 604800 ]; then
counter=0
echo "counter zero reset"
fi
done