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2013
05.21

I wrote a post about detecting rogue virtual machine a while ago. Today I am publishing my script for how to get list of mac addresses and their manufacturer. It is easy to put an if statement and make this script to detect virtual machines. This is just start, if I get some time I will make this smarter.

#scan C subnet assuming you're in 192.168.1.X
#check arp info
for ((i=0; i<255; i++))
do
ping -t 1 192.168.1.$i >temp.txt
done
arp -a | awk /:/ | cut -f 4 -d " " > macAddresses.txt
arp -a | awk /:/ | cut -f 2 -d " " > ipAddresses.txt
fileName=macAddresses.txt
#lookup those mac address on the web
cat $fileName | while read mac
do

#for each mac addresses we are sending post request and formating the output
#-qO- means show the output in terminal, not save in a file
#post data is obvious, use post method to fill a field "mac" on the form
#awk the Company part and format to gather the result

wget -qO- --post-data="mac=$mac" http://aruljohn.com/mac.pl | awk /\>Company/ | cut -f 5 -d ">" >>companiesTemp.txt

done

#little more formating for companies.Temp required

cut -f 1 -d "<" companiesTemp.txt >companies.txt
#combining ip,mac, and companies in a single file
paste ipAddresses.txt macAddresses.txt companies.txt>finalResult.txt

#printing final result on the screen
echo "The results are saved in local finalResult.txt, and we are kind enough to show them here"
cat ./finalResult.txt

#cleanUp temp files
rm temp.txt companies.txt companiesTemp.txt ipAddresses.txt macAddresses.txt

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