I have issue about packet sniffer in Python3.
version of python: 3.4
I followed some tutorial that works, but not on my computer. This code has to get mac address, convert it to string and in main() method should print to me destination mac, source mac and protocol.
code: sniffer_demo.py
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)
# one's and zero's put to the method ehternet_frame
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()
The error is:
Traceback (most recent call last):
File "sniffer_demo.py", line 28, in <module>
main()
File "sniffer_demo.py", line 11, in main
dest_mac, src_mac, eth_proto, data = ethernet_frame(raw_data)
File "sniffer_demo.py", line 19, in ethernet_frame
return get_mac_addr(dest_mac), get_mac_addr(src_mac), socket.htons(proto), data[14:]
File "sniffer_demo.py", line 24, in get_mac_addr
bytes_str = map('{:02x}'.format, bytes_addr)
ValueError: Unknown format code 'x' for object of type 'str'
How to fix that?