#!/bin/bash
supernode_off
while [ true ] ; do
	online=$(/bin/cat /etc/supernode-status/supernode.status)
	mode=$(/bin/cat /etc/supernode-status/supernode.mode)
	iam=$(/bin/hostname)
	day=$(date +%d)
	BATCTL=/usr/local/sbin/batctl
	#### Settings ####
	# Names of the 2 Supernodes #
	if [ $iam = "troisdorf4" ]; then
		my_SN_IP=185.66.193.104
		other_SN_IP=185.66.193.105
		other_SN_DNS=5.fftdf.de
		meship=10.188.0.4
		SN1=troisdorf4
		SN2=troisdorf5
		slack="/usr/local/bin/slacktee.sh -u troisdorf4"
	elif [ $iam = "troisdorf5" ]; then
		my_SN_IP=185.66.193.105
		other_SN_IP=185.66.193.106
		other_SN_DNS=6.fftdf.de
		meship=10.188.32.5
		SN1=troisdorf5
		SN2=troisdorf6
		slack="/usr/local/bin/slacktee.sh -u troisdorf5"
	elif [ $iam = "troisdorf6" ]; then
		my_SN_IP=185.66.193.106
		other_SN_IP=185.66.193.104
		other_SN_DNS=4.fftdf.de
		meship=10.188.64.6
		SN1=troisdorf6
		SN2=troisdorf4
		slack="/usr/local/bin/slacktee.sh -u troisdorf6"
	elif [ $iam = "troisdorf7" ]; then
		my_SN_IP=185.66.193.107
		other_SN_IP=185.66.193.104
		other_SN_DNS=4.fftdf.de
		meship=10.188.92.7
		SN1=troisdorf7
		SN2=troisdorf4
		slack="/usr/local/bin/slacktee.sh -u troisdorf7"
	fi
##################
# functions #
# Supernode off #
	supernode_off () {
	    /usr/local/sbin/batctl gw off
		/usr/sbin/service bird6 stop
		/usr/sbin/service bird stop
		/usr/sbin/service tunneldigger stop
		/usr/sbin/service tunneldigger-backup stop
		/usr/sbin/service radvd stop
		/usr/sbin/service isc-dhcp-server stop
		echo 0 > /etc/supernode-status/supernode.status
		echo "collectd.gateways.$iam.sn-status $online `date +%s`" | nc -q 0 10.188.1.27 2003
	}
# Supernode on #
	supernode_on () {
		/usr/local/sbin/batctl gw server 100Mbit/100Mbit
	    /usr/sbin/service bird6 start
	    /usr/sbin/service bird start
	    /usr/sbin/service tunneldigger start
	    /usr/sbin/service tunneldigger-backup stop
	    /usr/sbin/service radvd start
	    /usr/sbin/service isc-dhcp-server start
	    echo 1 > /etc/supernode-status/supernode.status
	    echo "collectd.gateways.$iam.sn-status $online `date +%s`" | nc -q 0 10.188.1.27 2003
	}
# Supernode Backup Mode
	supernode_backup () {
		/usr/local/sbin/batctl gw server 100Mbit/100Mbit
	    /usr/sbin/service bird6 start
	    /usr/sbin/service bird start
	    /usr/sbin/service tunneldigger start
	    /usr/sbin/service tunneldigger-backup start
	    /usr/sbin/service radvd start
	    /usr/sbin/service isc-dhcp-server start
	    echo 2 > /etc/supernode-status/supernode.status
	    echo "collectd.gateways.$iam.sn-status $online `date +%s`" | nc -q 0 10.188.1.27 2003
	}
# Restart Services #
	supernode_fail () {
		/usr/local/sbin/batctl gw off
		/usr/sbin/service bird6 restart
		/usr/sbin/service bird restart
		/usr/sbin/service tunneldigger restart
		/usr/sbin/service radvd restart
		/usr/sbin/service isc-dhcp-server restart
		echo 0 > /etc/supernode-status/supernode.status	
		echo "collectd.gateways.$iam.sn-status $online `date +%s`" | nc -q 0 10.188.1.27 2003
	}
#Check other Supernode
	if [ $mode != "0" ]; then
		if [ $mode = "1" ]; then
			/bin/nc -zvu $other_SN_DNS 53842
			if [ $? -eq 0 ]; then
		    	if [ $online = 2 ]; then
		    		echo "Supernode wieder online. Backup Modus abgeschaltet" | $slack
		    		supernode_on
		    	fi
			else
				supernode_backup
				echo "Supernode offline. Backup modus eingeschaltet" | $slack
			fi
		fi
# Check this Supernode
		/bin/ping -q -c5 $my_SN_IP -I eth0 > /dev/null
		if [ $? -eq 0 ]; then
		    if [ $online = 0 ]; then
		    	echo "Ich bin jetzt Supernode!" | $slack
		    elif [ $mode = 1 ]; then
		    	supernode_on
			elif [ $mode = 2 ]; then
				supernode_backup
			fi
		else
			supernode_fail
			echo "Ich konnte mich selbst nicht anpingen. Ich versuche mal die Services neu zu starten" | $slack
		fi
	fi
# Supernode off
	if [ $mode = "0" ]; then
		supernode_off
	fi
# Write Service Status
	for service in bird bird6 dhcpd radvd python named
    do
        x=`pidof $service`;
        if [ "$x" = "" ]; then 
            echo "collectd.gateways.$iam.$service 0 `date +%s`" | nc -q 0 10.188.1.27 2003
            echo 0 > /etc/supernode-status/"$service".status
        else
            echo "collectd.gateways.$iam.$service 1 `date +%s`" | nc -q 0 10.188.1.27 2003
            echo 1 > /etc/supernode-status/"$service".status
        fi
    done
# Check DNS Server
   	/usr/bin/host google.de $meship
   	if [ "$?" != "0" ]; then
   		service bind9 restart
   		if [ $mode != "0" ]; then
   			echo "DNS Server läuft nicht! Versuche neu zu starten!" | $slack
   		fi
   	fi
#Check Tunneldigger Connections
	if ! [ -d /opt/freifunk/tunneldigger_interfaces ]; then
		mkdir /opt/freifunk/tunneldigger_interfaces
	fi
#Remove old Interfaces
	rm /opt/freifunk/tunneldigger_interfaces/*
#Create Interace files
	for i in `/sbin/brctl show br-nodes | grep l2tp`;
	do
        touch /opt/freifunk/tunneldigger_interfaces/$i
	done
#Remove wrong file
	rm /opt/freifunk/tunneldigger_interfaces/no
	rm /opt/freifunk/tunneldigger_interfaces/br-*
	rm /opt/freifunk/tunneldigger_interfaces/8*
	sleep 60
done