I only know enough binary to ask where the bathroom is

This latest script was written to prevent 3:00am phone calls. I was recently called because our voicemail server was beginning to run out of disk space. The following script simply scans the voicemail directory, if a user is over 100MB it looks up their extension in the asterisk database and then sends them an email notification to clean it out. Below is the script:

#!/bin/bash
 
#set the maximum disk usage for a user to approx 100MB
size_limit=100000
 
function send_email () {
 
    subject="Voicemail Over Limit"
    message="/tmp/emailmessage.txt.$f"
 
    echo "Hello $name, " > $message
    echo " " >> $message
    echo "This is a notification that your voicemail is currently over the allowed limit.  You are currently using $humansize.  Please either manually delete the voicemails, or you can send an email to patb@codero.com for help with wiping all of the new and saved voicemails in your mailbox." >> $message
    echo " " >> $message
    echo "Thank you," >> $message
    echo "Admin" >> $message
 
    /bin/mail -s "$subject" "$email" < $message
}
 
for f in $(ls /var/spool/asterisk/voicemail/default/)
do
  size=$(du -s /var/spool/asterisk/voicemail/default/$f | awk '{print $1}')
  if [ "$size" -gt "$size_limit" ]
    then
 
        humansize=$(du -sh /var/spool/asterisk/voicemail/default/$f | awk '{print $1}')
        #Query the database for the users email address
        email=$(mysql -u asterisk --password=dbpassword asterisk -e "select email from voicemail_users where mailbox = '$f'")
        #Parse just the email address out of the above query
        email=$(echo $email | awk '{print $2}' )
 
        name=$(mysql -u asterisk --password=dbpassword asterisk -e "select fullname from voicemail_users where mailbox = '$f'")
        name=$(echo $name | awk '{print $2,$3}' )
        #echo "$name    $f  $email  $humansize"
        send_email $email $name $humansize
  fi
    # take action on each file. $f store current file name
done

I wrote this script so that I could quickly create virtualized subdomains on my server. I wrote it so that all you have to do to reuse it is simply change the first 3 lines of the file to match your server. This is version 1.o and I plan to add some more error handling and improvements further down the road. Feel free to contact me with any feedback or suggestions.

Click Here to see the full Post
or
Click Here to download the script

I found this gem of an Nmap command yesterday. I was unable to write about this nifty command because my site was offline. But I’m back now!

Important Notes:

You will need to download the latest version of nmap from insecure.org, or you can click here

The command:

nmap -PN -T4 -p139,445 -n -v --script=smb-check-vulns --script-args safe=1 [targetnetworks]

Just remove [targetnetworks] and replace that value with the subnet you wish to scan. Since my gateway is 192.168.1.1, I altered the command to scan my network to look like the following:

nmap -PN -T4 -p139,445 -n -v --script=smb-check-vulns --script-args safe=1 192.168.1.*

Analyze the output:

A clean machine should report at the bottom: “Conficker: Likely CLEAN”, while likely infected machines say: “Conficker: Likely INFECTED”. For more advice, see this nmap-dev post by Brandon Enright.

I’ve successfully written a bash script that runs once every minute. The script detects whether or not my server is online by issuing a simple ping request. Based on results of the ping request(s), the arduino will display a green LED when the server is online or a red LED if the server is offline. I’ve also setup a cron job to execute the script once a minute, giving me up to the minute status of my server. This specific project is not terribly amazing, but the foundation for many more projects to come has laid.

Click Here for the full project page