main.py

# python3
# this code just prints the info

import socket
import struct
import textwrap

def main():
	conn = socket.socket( socket.AF_PACKET, socket.SOCK_RAW, socket.ntohs(3))

	while True:
		raw_data, addr = conn.recvfrom(65536)
		dest_mac, src_mac, eth_proto, data = ethernet_frame(raw_data)
		print('\nEthernet Frame: ')  
		print( 'Destination: {}, Source:{} , Protocol: {}'.format(dest_mac, src_mac, eth_proto))
		
#Unpack ethernet frame 
def ethernet_frame(data):
	dest_mac, src_mac, proto = struct.unpack('! 6s 6s H',data[:14]) 
	return get_mac_addr(dest_mac), get_mac_addr(src_mac), socket.htons(proto), data[14:]

# Return properly formatted MAC address (ie AA: BB: CC:DD:EE: FF)
def get_mac_addr (bytes_addr):
	bytes_str = map('{:02x}'.format, bytes_addr)
	return ':'.join(bytes_str).upper()


main()