#!/bin/bash
#########################################################################
#                Script for change important parameters                 #
#                           Created by PM-DoIT                          #
#                                  0.7                                  #
#########################################################################

#------------------------------ DEFINITION -----------------------------#
MOD=BASERPI

#------------------------------- LOCAL IP ------------------------------#
check_nic(){
NICS=$(find /sys/class/net -type l -not -lname '*virtual*' -printf '%f\n')
for i in $NICS;
do
CI=$(ifconfig $i | grep -w inet)
if [ ! -z "$CI" ]; then
echo -e "- \e[1;32mActive\e[0m [\e[1;33m$i\e[0m]"
SN=$(ifconfig $i | grep -w ether | sed 's/:/ /g' | awk '{print tolower ($5$6$7)}')
IP=$(ifconfig $i | grep -w inet | awk '{print $2}')
fi
done
if [ -z "$IP" ]; then
echo -e "- \e[1;31mmissing\e[0m IP address"
exit 1
else
echo -e "- \e[1;32mIP-Address\e[0m [\e[1;33m$IP\e[0m]"
fi
OLDURL=$(cat /etc/monit/monitrc | grep "use address" | awk '{print $3}')
if [ -z "$OLDURL" ]; then
OLDURL=$(cat $WEB | grep http | awk '{print $4}' | sed 's/\/\// /g' | sed 's/\// /g' | sed 's/:/ /g' | awk '{print $2}' | sort | uniq | grep [0-9])
fi
}

#--------------------------- UPDATE HOSTNAME ---------------------------#
update_host(){
if ! grep -qs "$MOD-$SN" /etc/hosts;
then
echo -e "- \e[1;33mUpdating\e[0m [\e[1;34mHOST\e[0m]"
echo "$MOD-$SN" > /etc/hostname
chattr -i /etc/hosts
echo "127.0.0.1 localhost" > /etc/hosts
echo "127.0.1.1 $MOD-$SN" >> /etc/hosts
chattr +i /etc/hosts
hostname "$MOD-$SN"
fi
}

#----------------------------- UPDATE MONIT ----------------------------#
update_monit(){
MONIT=$(cat /etc/monit/monitrc | grep "check system" | awk '{print $3}')
MONIP=$(cat /etc/monit/monitrc | grep "use address" | awk '{print $3}')
if [[ "$MOD-$SN" != "$MONIT" ]] || [[ "$IP" != "$MONIP" ]]; then
echo -e "- \e[1;33mUpdating\e[0m [\e[1;35m/etc/monit/monitrc\e[0m]"
sed -i "s/check system.*/check system $MOD-$SN/g" /etc/monit/monitrc
sed -i "s/use address.*/use address $IP/g" /etc/monit/monitrc
/etc/init.d/monit restart > /dev/null 2>&1 || systemctl restart monit > /dev/null 2>&1
fi
}

#--------------------------- UPDATE POSTFIX ----------------------------#
update_postfix(){
POSTFIX=$(cat /etc/postfix/main.cf | grep -w "^myhostname" | awk '{print $3}')
if [[ "$MOD-$SN" != "$POSTFIX" ]]; then
echo -e "- \e[1;33mUpdating\e[0m [\e[1;35m/etc/postfix/main.cf\e[0m]"
sed -i "s/myhostname =.*/myhostname = $MOD-$SN/g" /etc/postfix/main.cf
sed -i "s/mydestination = \$myhostname,.*/mydestination = \$myhostname, $MOD-$SN, localhost/g" /etc/postfix/main.cf
newaliases
/etc/init.d/postfix restart > /dev/null 2>&1 || systemctl restart postfix > /dev/null 2>&1
fi
}

#-------------------------- UPDATE WEB SOURCE --------------------------#
update_web(){
LST=$(find /var/www/ -name index.htm*)
if [[ "$OLDURL" != "$IP" ]]; then
echo -e "- \e[1;33mUpdating\e[0m \e[1;34mIP\e[0m [\e[1;35m$w\e[0m]"
for w in $LST;
do
sed -i "s/$OLDURL/$IP/g" $w
done
fi
for w in $LST;
do
OLDHST=$(cat $w | grep -i TITLE | sed 's/>/ /g' | sed 's/</ /g' | awk '{print $2}')
if [[ "$OLDHST" != "$MOD-$SN" ]]; then
echo -e "- \e[1;33mUpdating\e[0m \e[1;34mHOST\e[0m [\e[1;35m$w\e[0m]"
sed -i "s/<TITLE>.*/<TITLE>$MOD-$SN<\/TITLE>/g" $w
sed -i "s/<title>.*/<title>$MOD-$SN<\/title>/g" $w
sed -i "s/on server.*/on server $MOD-$SN<\/font><\/p>/g" $w
fi
done
}

#--------------------------------- CORE --------------------------------#
clear
check_nic
update_host
update_monit
update_postfix
update_web