| vuko | 3cd087d | 2021-12-28 13:19:40 +0100 | [diff] [blame^] | 1 | import logging |
| 2 | import pcapy |
| 3 | import struct |
| 4 | |
| 5 | interface = 'wlan0' |
| 6 | target = './dhcp-cap' |
| 7 | logger = logging.getLogger() |
| 8 | logger.setLevel(logging.DEBUG) |
| 9 | logger.addHandler(logging.StreamHandler()) |
| 10 | |
| 11 | def hwaddr_ascii(packet): |
| 12 | # picking up MAC directly from ethernet frame |
| 13 | return ':'.join('%02x' % ord(c) for c in packet[6:12]) |
| 14 | |
| 15 | def capture_dhcp(itf): |
| 16 | f = open(target, 'w') |
| 17 | reader = pcapy.open_live(itf, 4096, False, 5000) |
| 18 | reader.setfilter('udp dst port 67') |
| 19 | def callback(header, packet): |
| 20 | hwaddr = hwaddr_ascii(packet) |
| 21 | logger.info('Captured dhcp request from %s', hwaddr) |
| 22 | f.write(hwaddr + '\n') |
| 23 | f.flush() |
| 24 | try: |
| 25 | while True: |
| 26 | reader.dispatch(1, callback) |
| 27 | except KeyboardInterrupt: |
| 28 | pass |
| 29 | |
| 30 | capture_dhcp('wlan0') |