def test_tap_persistent():
name = b'test_tap'
t1 = tap.Tap(name)
t1.persist()
t1.close()
assert ifconfig.findif(name, physical=False) is not None
t2 = tap.Tap(name)
t2.unpersist()
t2.close()
assert ifconfig.findif(name, physical=False) is None
def test_tap_write():
t = tap.Tap()
pre_stats = t.get_stats()
tap_mac = b''.join(codecs.decode(i, 'hex') for i in t.mac.split(':'))
# fake ethernet packet addressed to the tap interface
packet = tap_mac + b'\x00\x11"3DU\x90\x00fake payload'
t.write(packet)
post_stats = t.get_stats()
assert post_stats['rx_packets'] == pre_stats['rx_packets'] + 1
assert post_stats['rx_bytes'] == pre_stats['rx_bytes'] + len(packet)
def test_tap_read():
t = tap.Tap(blocking=False)
t.up()
# create raw layer 2 socket
s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW,
socket.htons(ETH_P_ALL))
s.bind((t.name.decode('ascii'), ETH_P_ALL))
# fake ethernet packet
packet = b'\xde\xad\xbe\xef\xde\xad\x00\x11"3DU\x90\x00fake payload'
s.send(packet)
while True:
r, _, _ = select.select([t.fd], [], [], 3)
assert r, 'did not receive expected packet - timed out'
if t.fd.read(1500) == packet:
break
def test_tap_close():
t = tap.Tap()
t.close()
assert ifconfig.findif(t.name, physical=False) is None
def test_tap_create():
t = tap.Tap()
assert ifconfig.findif(t.name, physical=False) is not None
assert t.fd
assert t.name