Rascunho

#!/usr/bin/env python3

"""   ##### Address Resolution protocol #####
 __________________________________________________
|################################################ /|
|               ethernet broadcast               |#|  --> 6 bytes
|------------------------------------------------|#|
|              ethernet sender mac               |#|  --> 6 bytes
|------------------------------------------------|#|
|             ethernet protocol type             |#|  --> 2 bytes
|------------------------------------------------|#|
|                 hardware type                  |#|  --> 2 bytes
|------------------------------------------------|#|
|               protocol protocol                |#|  --> 2 bytes
|------------------------------------------------|#|
|       mac address length || length protocol    |#|  --> 2 bytes
|------------------------------------------------|#|
|                operation number                |#|  --> 2 bytes
|------------------------------------------------|#|
|               sender mac address               |#|  --> 6 bytes
|------------------------------------------------|#|
|              sender IPv4 address               |#|  --> 4 bytes
|------------------------------------------------|#|
|            \x00\x00\x00\x00\x00\x00            |#|  --> 6 bytes
|------------------------------------------------|#|
|              receive IPv4 address              |#|  --> 4 bytes
+________________________________________________|/

                                                                   Packet size 42 bytes

"""

from struct import *
import socket


dst = b'\xff\xff\xff\xff\xff\xff'  # 6 bytes
src = b'\x74\x29\xaf\xa1\xef\x67'  # 6 bytes
pro = 0x0806  # 2 bytes

htype = 0x01  # 2 bytes
ptype = 0x0800  # 2 bytes
hsize = 0x06  # 1 byte
psize = 0x04  # 1 byte
op = 0x01  # 2 bytes
shwa = b'\x74\x29\xaf\xa1\xef\x67'  # 6 bytes
spa = socket.inet_aton('192.168.0.8')  # 4 bytes
thwa = b'\x00\x00\x00\x00\x00\x00'  # 6 bytes
tpa = socket.inet_aton('192.168.0.1')  # 4 bytes

ether_frame = pack('!6s6sH', dst, src, pro)

arp_frame = pack('!HHBBH6s4s6s4s', htype, ptype, hsize, psize, op, shwa, spa, thwa, tpa)

# pacote arp
packet = ether_frame + arp_frame

sock = socket.socket(socket.PF_PACKET, socket.SOCK_RAW, socket.htons(0x0806))
sock.bind(('wlan0', 0))

count = 0
while count != 5:
    count += 1
    try:
        # envia o pacote
        sock.send(packet)

        # espera a resposta
        sock.settimeout(0.5)
        response = sock.recvfrom(42)[0]
        if response:
            print(response)
    except socket.timeout:
        print("Tentativa %i não obteve resposta" % count)
        continue