Random MAC address generator

README.md

Example

• To generate dataset: bash random-mac.sh 10

• To search by device id: bash random-mac.sh -s 8

• Replace the file name with the actual path to the file.

• Replace replace 10 with actual number of devices.

• Repalce 8 with the device id to be searched.

The result will be saved in dataset.csv file.

random-mac.sh

#!/bin/bash

# this will generate n random mac-48 addresses

# define organisational unique identifier (OUI), if any and the separator to be used like ':' or '-'
OUI=''
SEP=':'
DATA_SET='dataset.csv'

# functions for generating half mac address i.e three ocatates at a time
get_hex(){
	# generating a random number between 0 to 15 and convering to hexadecimal
	m=$(shuf -i0-15 -n1)
	hex=$(printf "%x" $m)
	echo "$hex"
}
three_oct(){	
	three_oct="$(get_hex)$(get_hex)$SEP$(get_hex)$(get_hex)$SEP$(get_hex)$(get_hex)"
	echo $three_oct
}
generate(){
	printf 'Generating MAC addresses'
	echo 'Device Id,Ethernet MAC Id, Wifi Interface MAC Id' > "$DATA_SET"
	for ((i=1;i<=$1;i++)); do
		if [[ $OUI != '' ]]; then
			mac_eth="$OUI$SEP$(three_oct)"
			mac_wl="$OUI$SEP$(three_oct)"
		else
			mac_eth="$(three_oct)$SEP$(three_oct)"
			mac_wl="$(three_oct)$SEP$(three_oct)"
		fi
		echo "$i,$mac_eth,$mac_wl" >> "$DATA_SET"
		printf '.'
	done
	echo ".Done. Saved in $DATA_SET"
}

# for seaching data in $DATA_SET
search(){
	if [[ -f $DATA_SET ]]; then
		line=$(sed -n "$(($1+1))p" < "$DATA_SET")
		if [[ $line ]]; then
			IFS=',' read -ra data <<< "$line"
			echo "Data for device id $1:"
			echo "Ethernet MAC address: ${data[1]}"
			echo "Wifi interface MAC address: ${data[2]}"
		else
			echo "$1: Device id not found"
		fi
	else
		echo "$DATA_SET: No such file present."
	fi
}

# main execution
if [[ $# == 1 && $1 =~ ^[0-9]+$ ]]; then
	generate $1
elif [[ $# == 2 && $1 == '-s' && $2 =~ ^[0-9]+$ ]]; then
	search $2
else
	echo 'Please provide the valid number of devices as argument to generate dataset.'
	echo 'To search data of any device use "-s" option followed by the device id.'
fi