#!/bin/bash

source /sbin/lang.sh || exit 1

source /boot/drbd.conf &>/dev/null

#We want to use drbd with heartbeat at all?
if [ "$DRBD" == "1" ] && [ "$CLUSTER_ID" ]; then
	#we want to receive/send heartbeats:
	ifconfig $ETH up
	
	if HEARTBEATS="`syndog $CLUSTER_ID --cat`"; then

		#received critical network config info, update network config
		NODE_ID=`cat /sys/class/net/$ETH/address`
		OTHER_NODE_ID=`echo "$HEARTBEATS"|cut -f3 -d' '|head -1`
		OTHER_BOOTED=`echo "$HEARTBEATS"|cut -f4 -d' '|head -1`


		#the node_ids determine the order of ip's.
		if [ "$NODE_ID" ">" "$OTHER_NODE_ID" ]; then
			SELECTED_LOCAL_IP=$LOCAL_IP
			SELECTED_REMOTE_IP=$REMOTE_IP
		else
			SELECTED_LOCAL_IP=$REMOTE_IP
			SELECTED_REMOTE_IP=$LOCAL_IP
		fi

		ifconfig $ETH:drbd $SELECTED_LOCAL_IP
		ifconfig $ETH up
		syn3-drbdconnect

		BEAT=`echo "$HEARTBEATS"|cut -f1 -d' '|sort |uniq`

		if [ "$OTHER_BOOTED" == 1 ];then
			if [ "$NODE_ID" ">" "$OTHER_NODE_ID" ]; then
				#this node primary prefered
				syn3-state drbd-heartbeat ALERT "PANIC! Both nodes are booted, please reboot OTHER node!"
			else
				#this node secondary prefered
				if [ "$STONITH" == "1" ] ;then
					#check if we receive the 'other node online' signal via a safe crosslink interface
					SAFE_STONITH_CHECK=`echo "$HEARTBEATS"|grep ^$ETH|cut -f4 -d' '|head -1`
					if [ "$SAFE_STONITH_CHECK" == "1" ]; then
						syn3-state drbd-heartbeat ALERT "PANIC! Both nodes are booted, THIS NODE WILL REBOOT NOW!"
						sleep 3 #time to read message
						reboot -f
					else
						syn3-state drbd-heartbeat ALERT "PANIC! Both nodes are booted, please reboot THIS node! (cannot auto reboot, packets received via unsafe interface)"
					fi
				else
					syn3-state drbd-heartbeat ALERT "PANIC! Both nodes are booted, please reboot THIS node!"
				fi
		    fi
		else
			syn3-state drbd-heartbeat OK "`_DrbdHeartBeatOk \"$BEAT\"`"
		fi

	else
		syn3-state drbd-heartbeat ALERT "`_DrbdHeartBeatMissing`"
	fi
else
	syn3-state drbd-heartbeat DELETE
fi