def _send(self):
if self._is_first_ping:
self._is_first_ping = False
else:
time.sleep(1)
start_timestamp = time.time()
self._sock.send(self._data)
try:
timeout = 2
while timeout > 0:
self._sock.settimeout(timeout)
data, raddr = self._sock.recvfrom(1500)
recv_timestamp = time.time()
etherhdr = EtherHeader()
etherhdr.load(data)
if etherhdr.h_proto == ETH_P_ARP:
arp = Arp()
arp.load(data[etherhdr.length:])
if arp.ar_op == ARPOP_REPLY:
if arp.ar_spa == self.args.destip:
print('replay from {0} [{1}] {2:.3f} ms'.format(
self.args.destip, arp.ar_sha,
recv_timestamp - start_timestamp))
break
timeout -= time.time() - start_timestamp
if timeout < 0:
raise socket.timeout()
except socket.timeout:
print('timeout')
def _before_send(self):
super(Arping, self)._before_send()
self._sock = EthernetSocket(self.args.interface, ETH_P_ARP)
self._arp = Arp()
self._etherhdr = EtherHeader()
self._etherhdr.h_source = get_if_hwaddr(self.args.interface)
self._etherhdr.h_dest = 'ff:ff:ff:ff:ff:ff'
self._etherhdr.h_proto = ETH_P_ARP
self._arp.ar_sha = self._etherhdr.h_source
self._arp.ar_tha = self._etherhdr.h_dest
self._arp.ar_spa = get_if_addr(self.args.interface)
self._arp.ar_tpa = self.args.destip
self._arp.ar_op = ARPOP_REQUEST
self._data = self._etherhdr.dump() + self._arp.dump()
print('ARPING {0} from {1} {2}'.format(
self.args.destip, socket.inet_ntoa(self._arp.ar_spa),
self.args.interface))
self._is_first_ping = True
