#!/bin/sh
ver="1.3"
vdate="2nd July 2003"
#
#	1.3	02/Jul/2003	Cleaned up Email
#	1.2	10/Mar/2002	Tidy up in preperation for public release
#	1.1	23/Jan/2001	Added Log rotation section
#	1.0	18/Nov/2000	Completed
#
date=$(/bin/date "+%Y/%m/%d %H:%M:%S")
today=$(/bin/date +%Y/%m/%d)
yest=$(/bin/date --date="1 day ago" +%Y/%m/%d)
rotate_date=$(/bin/date --date="1 month ago" +%Y/%m/%d)
script=$(/bin/basename $0 2>/dev/null)
hist_2day=" * No Logging enabled"
hist_yest=" * No Logging enabled"
panic=/tmp/.$script.panic
email_contents=/tmp/.$script.email
email=""
showparam=""
alert=""
help=""
while getopts ":w:p:e:l:s" option;	do
	case $option in
	w )	warn=$(/bin/echo $OPTARG | /bin/sed s~[^0-9\.]~~g 2>/dev/null);;
	p )	period=$(/bin/echo $OPTARG | /bin/sed s~[^0-9]~~g 2>/dev/null);;
	e )	email=$OPTARG;;
	l )	logfile=$OPTARG;;
	s )	showparam=1;;
	* )	help=1;;
	esac
done

if [ ! -z "$showparam" ]  ||  [ ! -z "$help" ]  ||  [ -z "$period" ]  ||  [ -z "$warn" ];	then
	if [ -z "$warn" ];		then	err_1="*";else err_1=" ";fi
	if [ -z "$period" ];	then	err_2="*";else err_2=" ";fi
	/bin/echo "$script: v$ver on $vdate, http://scripts.akakul.co.uk/cpu_temp"
	/bin/echo "Usage: ./$script -w temperature -p period [-e email] [-l logfile] [-s]"
	/bin/echo "* denotes missing 'required' argument('s)"
	/bin/echo "$err_1 -w:   Temperature to trigger Email, +ve real/integer i.e. 39.5"
	/bin/echo "$err_2 -p:   One email per 'period'(minutes) is sent, +ve integer i.e. 60"
	/bin/echo "  -e: [optional] Email Address i.e. nobody@akakul.co.uk"
	/bin/echo "  -l: [optional] Full path to log history i.e. /var/log/cputemp.log"
	/bin/echo "  -s: [optional] Show Parameters (test correct order), and EXIT"
	/bin/echo "e.g. ./$script -w 45 -p 360 -e nobody@akakul.co.uk -l /var/log/cputemp.log"
	/bin/echo
	/bin/echo "Parameters Input:"
	/bin/echo " -w (Warning Temperature): $warn"
	/bin/echo " -p (Email Period):        $period"
	/bin/echo " -e (Email Address):       $email"
	/bin/echo " -l (History Log File):    $logfile"
	exit 1
fi
	
curr_temp=$(/bin/grep temperature /proc/cpuinfo | /bin/awk {'print $3'} 2>/dev/null)
warning=$(/bin/echo $curr_temp $warn | /bin/awk {'if ($1 >= $2) print "PANIC"'} 2>/dev/null)
dont_email=$(/usr/bin/find $panic -mmin -$period -print 2>/dev/null)
if [ ! -z "$logfile" ];	then
	if [ ! -z $warning ];	then
		alert="\tALERT ($warn $period $email)"
	fi
	/bin/echo -e "$date\t$curr_temp$alert" >> $logfile
fi
# START Log rotate section (keeps 1 months of logs max)
rotate=$(/bin/grep -n "^$rotate_date" $logfile | /usr/bin/tail -1 | \
        /bin/awk -F: {'if ($1 > 1) print $1'} 2>/dev/null)
if [ ! -z "$rotate" ];  then
        tail_num=$(($(/usr/bin/wc -l $logfile | /bin/awk {'print $1'} 2>/dev/null) - $rotate))
        /bin/mv -f $logfile $logfile.tmp
        /usr/bin/tail -$tail_num $logfile.tmp > $logfile
        /bin/rm -rf $logfile.tmp
        /bin/echo -e "$date\tLOG ROTATED" >> $logfile
fi
# END Log rotation section
if [ ! -z $dont_email ];	then
	exit 0
fi
/bin/rm -rf $panic

/bin/echo "CPU Temperature Monitor has been triggered.\nhttp://scripts.akakul.co.uk/cpu_temp\n\
	You will NOT be emailed about this again for another $period minutes\n\n\
	Current CPU Temperature: $curr_temp (>= $warn)\n\nTodays History:\n" > $email_contents

if [ ! -z "$warning" ];	then
	/bin/touch $panic 2>/dev/null
	if [ -f "$logfile" ];	then
		/bin/echo -e "$date\t$curr_temp$alert EMAILED" >> $logfile
		hist_2day=$(/bin/grep "^$today" $logfile | /bin/sed s~^$today~~ | \
			/bin/sort -r >> $email_contents 2>/dev/null)
		/bin/echo "\n\nYesterdays History:\n" >> $email_contents
		hist_yest=$(/bin/grep "^$yest" $logfile | /bin/sed s~^$yest~~ | \
			/bin/sort -r >> $email_contents 2>/dev/null)
	fi
	if [ ! -z "$email" ];	then
		/bin/cat $email_contents | /bin/mail -s "Warning CPU Temp=$curr_temp @ $date" $email
	else
		/bin/cat $email_contents
	fi
fi
/bin/rm -f $email_contents

# End of Script