IPC script für E-Mail bei reconnect DSL mit neuer IP

#!/bin/bash

#Maileinstellung -> benoetigt [apt-get install sendEmail]
 SMTPFROM="`hostname`@fqdn.net"
 SMTPTO='admin@fqdn.net'
 SMTPSERVER='mail.fqdn.net'
 SMTPUSER=''
 SMTPPASS=''

HOST="host.ath.cx"	# DynDNS Hostname
EVERY="300" # Zeit in Sekunden zwischen den Abfragen 

###

CHECKIPURL="http://checkip.dyndns.org/"
CHECKIPURL2="http://www.myip.ch/"
srcn=$(basename $0)

if [ ! -f /usr/bin/sendEmail ] ; then
	echo -e "\033[1;31mMailbenachrichtigung wurde aktiviert, jedoch ist sendEmail nicht installiert!\033[0m"
	echo ""
	exit 1
fi

get_IPs() {
	HOSTIP=$(ping -c 1 "$HOST" | sed -n 1p | sed -e 's/(//g' -e 's/)//g' | awk '{ print $3 }')
	wget -q --timeout=10 -O /tmp/_current_ip $CHECKIPURL
	CURRENTIP=$(cat /tmp/_current_ip | cut -d ' ' -f 6 | cut -d '<' -f 1)
	if [ -z "$CURRENTIP" -o "$CURRENTIP" = " *" -o "$CURRENTIP" = "*1.0 *" ]; then
		if [ ! -z "$1" ]; then
			echo "Hmm... $CHECKIPURL seems to be down?! Using: $CHECKIPURL2 insteed"
		fi
		wget -q -O /tmp/_current_ip $CHECKIPURL2
		CURRENTIP=$(cat /tmp/_current_ip | cut -d ' ' -f 6 | cut -d '<' -f 1)
	fi
}

update_interval() {
	echo $(pidof -x $0) >/tmp/.$srcn.pid
	while true; do
		get_IPs
		if [ "$HOSTIP" != "$CURRENTIP" ]; then
			send_Email
		fi
		sleep $EVERY
	done
}

send_Email() {
	SUBJECT="IPC CS-Server IP change"
	echo "`hostname -f` hat sich neu eingewaehlt und eine neue IP erhalten" >/tmp/mail
	echo "" >>/tmp/mail
	echo "DynDNS Hostname: $HOST" >>/tmp/mail
	echo "DynDNS Host IP: $HOSTIP" >>/tmp/mail
	echo "Current IP: $CURRENTIP" >>/tmp/mail
	echo "" >>/tmp/mail
	sed -e 's/$/\r/' /tmp/mail >/tmp/mail.txt
	sendEmail -f $SMTPFROM -t $SMTPTO -u "$SUBJECT" -o m-file=/tmp/mail.txt -s $SMTPSERVER -xu $SMTPUSER -xp $SMTPPASS >/dev/null 2>&1
	rm -f /tmp/mail && rm -f /tmp/mail.txt >/dev/null 2>&1
}

kill_script() {
	counter="5"
	PID=$(cat /tmp/.$srcn.pid)
	if [ -z "$PID" ]; then
		PID=$(pidof -x $srcn)
	fi
	if [ ! -z "$PID" ]; then
		PID="$PID `pidof -x sleep`"
		echo "PID: $PID"
		kill -9 $PID >/dev/null 2>&1
		echo "Killed $PID"
	else
		echo "Nothing to $1!"
	fi
	sleep 5
	if [ ! -z `pidof -x sleep` ]; then
		while [ $counter -gt 0 ]; do
			echo "...Retrying to kill script! (retrys: $counter , PID: $PID)"
			kill -9 $PID >/dev/null 2>&1
			PID=$(pidof -x $srcn)
			PID="$PID `pidof -x sleep`"
			counter=`expr $counter - 1`
		done
	fi
	echo "Should be killed..."
	rm -f /tmp/.$srcn.pid
}

case "$1" in
	"")
		update_interval
	;;
	auto)
		$0 &
	;;
	stop|kill)
		kill_script $1
	;;
	now)
		get_IPs
		echo "HOST: $HOST - HOSTIP: $HOSTIP - CURRENTIP: $CURRENTIP"
		echo "Verschicke Email..."
		send_Email
		echo "done"
	;;
	help|hilfe|?)
		echo "Usage: $0 [now|auto|kill|help]"
		echo "$0 now -> Sofortiges abfragen und sendern der Email"
		echo "$0 auto -> Überprüft/updated $HOST alle $EVERY Sekunden"
		echo "$0 kill -> Script wird beendet"
		echo "$0 help -> Zeigt diese Hilfr..."
	;;
	*)
		echo "Usage: $0 [now|auto|kill|help]"
	;;
esac

exit 0