Listen for WOL packets to trigger power-on via IPMI

wol.py

#!/usr/bin/python3
from scapy.all import sniff
from sys import argv
from struct import unpack
from subprocess import check_output

USERNAME = 'ADMIN'
PASSWORD = 'secret'

hosts = {
    'ac:1f:6b:b1:76:5a': 'server1-ipmi',
    'ac:1f:6b:b1:7b:22': 'server2-ipmi',
    'ac:1f:6b:b1:7b:3a': 'server3-ipmi',
    'ac:1f:6b:b1:7b:62': 'server4-ipmi'
}

def on_wol_packet(pkt):
    if hasattr(pkt.getlayer('UDP'), 'load'):
        data = pkt.getlayer('Ether').load
        broadcast = ':'.join(map('{:02x}'.format, unpack('BBBBBB', data[0*6:1*6])))
        machine = ':'.join(map('{:02x}'.format, unpack('BBBBBB', data[1*6:2*6])))

        if machine not in hosts:
            print('Unknown MAC: {:s}'.format(machine))
            return

        ret = check_output([
            'ipmitool', '-H', hosts[machine], '-U', USERNAME, '-P', PASSWORD, 'power', 'on'
        ]).decode()
        print('cmd returned: {:s}'.format(ret))


if __name__ == '__main__':
    assert len(argv) > 1, 'Usage: {:s} LISTEN_INTERFACE'.format(argv[0])
    packets = sniff(count=0, iface=argv[1], filter='ether proto 0x0842 or udp port 9 or udp port 7 or udp port 0', prn=on_wol_packet)