fetchmail to get the mails from your imap account

Now, that you have set the RPi to send emails, lets do the next best thing. Setup fetchmail so that we can setup a cron job to run and get us the emails on Raspberry Pi. What can we do with these emails, lots πŸ™‚ (I hope you already have a Raspberry Pi, if not then head over toΒ  element14.)

For now, first install fetchmail:

sudo apt-get install fetchmail

and if you are one of the guys who wants easy configuration then :

sudo apt-get install fetchmailconf

If you are using fetchmailconf, then just fire up “fetchmailconf”. You will get a GUI, where you can configure the setting. If not, then you can create a file “~/.fetchmailrc” which should look something like this:

poll 
protocol IMAP
user "" with password "" mda ""
folder 'INBOX'
fetchlimit 1
# do not delete the mails on server.
keep
# do not re-write the headers for the mail, get saner headers for the script to process.
no rewrite
# use ssl
ssl

 

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Raspberry Pi automate certain tasks – script example

Now, if you have followed these :

fetchmail

ssmtp

Then you already have a working system for sending and receiving mail. Now, you can set the mda in the fetmailrc to a script which can do few things for you. The script below will get a page and mail it to you, if you have the subject as “get” and send “wake on LAN” to desired PC if you have subject as “wol”. Cool πŸ™‚

Original idea from here.

Here is the script:

#!/bin/bash

expectedFrom=""
expectedFrom2=""
homePC="MAC Here"

mailHelp() {
	sendMail $1 "Help - Possible Commands" "Help"
}

sendMail() {
	echo "To: "$1 > $tmpMail
	echo "From: From address here" >> $tmpMail
	echo "Subject: "$2 >> $tmpMail
	echo "Content-Type: text/html" >> $tmpMail
	echo "" >> $tmpMail
	echo $3 >> $tmpMail
	cat $tempMail >> $tmpMail
	cat $tmpMail|/usr/sbin/ssmtp  $1
}
#here we start the actual processing

rightSender=0
sender=""
tmpFile=/tmp/mailtemp
tmpMail="/var/tmp/mailtxt.txt"
tempMail="/tmp/tosend.txt"
>$tempMail
>$tmpFile
>$tmpMail

#Write the mail to tmpFile
while read line
do
	echo $line >> $tmpFile
done

grep "From:" $tmpFile | grep $expectedFrom > /dev/null
if [ $? -eq 0 ]; then
	rightSender=1
	sender=$expectedFrom
fi

grep "From:" $tmpFile | grep $expectedFrom2 > /dev/null
if [ $? -eq 0 ]; then
	rightSender=1
	sender=$expectedFrom2
fi

if [ $rightSender -eq 1 ]; then
	task=`grep "Subject:" $tmpFile`
	task=${task:9}
	task=`echo $task | tr [:upper:] [:lower:]`

	echo $task | grep "help" > /dev/null
	if [ $? -eq 0 ]; then
		mailHelp $sender
		exit
	fi
fi
while read line
do
	if [[ $line =~ ^$|^Content*:*|^charset=*|^--=* ]]; then
		continue;
	fi
	echo "LINE :: $line"
	case $task in
		get)
			cmd="wget -o /dev/null -O - $line"
		;;
		wol)
			cmd="sudo etherwake $$line"
		;;
		*)
			cmd="$line"
		;;
	esac
	eval $cmd >> $tempMail
done < <( sed '1,/^$/ d' $tmpFile|sed '/^--$/,$ d')
sendMail $sender "Output result of command $task" "Happy Hacking"

rm $tmpFile
rm $tmpMail
rm $tempMail
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Monitor your system with sysusage.

First some information on sysusage:

Description :
SysUsage continuously monitor your systems informations and generate
periodical graph reports using rrdtool or javascript jqplot library.
All reports are shown throught a web interface.

SysUsage grabs all system activities using Sar and system commands allowing
you to keep tracks of your computer or server activity during his life.
It is a great help for performance analysis and resources management. The
threshold notification can alarm you when the system capabilities are
reached by sending SMTP messages or throught Nagios reports.

By default it will monitor all you need to know on your server activity, it
is written in Perl and should works on all Unix like plateforms. It doesn’t
require a Database system like MySQL or PostgreSQL but lie on rrdtool. In
addition you can embeded your own plugins written in any programing language.

Since release 5.0 SysUsage can be run from a centralized place where
collected statistics will be stored and where graphics will be rendered.
Unless other monitoring tools with lot of administration work, SysUsage is
design to have the lesspossible things to configure and a high level of admin
system knowledge. Each server can also be self monitored and you just have to
connect your browser to the web interface to know his health level.

SysUsage is design with simplicity in mind. I want all relevant statistics
from my servers within an intuitive web interface and without spending too
much time to configure it, if you know Nagios, you know what I mean. You will
especially like SysUsage for that.

And now for the installation:

sudo yum install sysusage sysusage-httpd

Once you have installed, you would need to enable the crontab to collect the data. And the sysusage-httpd is for the apache server configure to enable you to access http://localhost/sysusage

And you are done. It pretty good to see the overall system usage wrt to CPU, Disk and network.

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