Script to check IP address and send to an email

kbrajesh · 02-07-2007, 01:18 AM

Is there a script/package which can check the external IP on regular basis and send the changes to an email?

Notwerk · 02-07-2007, 02:19 AM

This will check the current IP of the interface you sepcify and if it has changed will store it in a log file which can only be read by root. You can run it every 5 minutes in a crontab

Code:

#!/bin/sh

PATHIFCONFIG=/sbin/ifconfig
PATHCURRENTIP=/var/log/ipinfo/ip
IFACE=ppp0                # Specify the device you wish to monitor here
umask 177                 # Only root can read the log file

CURRENTIP=`$PATHIFCONFIG -a|grep -A 1 $IFACE|grep inet|awk '{print $2}' | awk -F: '{print $2}'`

grep $CURRENTIP $PATHCURRENTIP 1>/dev/null 2>&1

if [ $? -ne 0 ];
then
  CURRENTIP=`$PATHIFCONFIG -a|grep -A 1 $IFACE|grep inet|awk '{print  $2}' |awk -F: '{print $2}'`
  echo "$CURRENTIP" > $PATHCURRENTIP
fi

You can hack it a little to have it email the log file if it has changed.

Cheers

kbrajesh · 02-08-2007, 01:36 AM

Thank you for your quick reply .. I am new to linux and i dont have indepth knowledge . what i need is to get all the ip address of a machine daily basis.. line i need to get a mail at 9.30 AM or 10.00 AM everyday. Can you suggest a better method or tell me how can i send the output of the command ifconfig over mail.

Notwerk · 02-08-2007, 02:26 AM

You can pipe the output of the shell script to something like

Code:

#!/bin/sh
(
 echo "To: [ur_email_address]"
 echo "From: system <root>"
 echo "Subject: List of IPs"
 echo

[Script goes here]

) 2>&1 | /usr/lib/sendmail -t
exit 0

If course you'll need sendmail running and if the email address you're sending to isn't a local address you'll need to configure sendmail.

Do google around and check that man pages, too

kbrajesh · 02-08-2007, 03:13 AM

once again thanks you for ur reply .. i got his script from one of the site.. but it is not working for me .. can u plz go through it

#!/bin/sh

FILE2=`echo "/fwlog/ifconfig.txt"`

touch /fwlog/ifconfig.txt
ifconfig eth0 | grep inet | awk -F: '{print $2}' | sed 's/Bcast//' > /fwlog/ifconfig.txt
mv -f /fwlog/ifconfig.txt $FILE2

cat $FILE2 | mail -s"IP address, ifconfig" xxxxx@xxxxxxxx.com

Rajesh