def test(self, in_cksum):
inst = SCIONUDPHeader()
inst._dst = create_mock_full(
{
"isd_as": create_mock_full({"pack()": b"dsIA"}),
"host": create_mock_full({"pack()": b"dstH"}),
},
class_=SCIONAddr)
inst._src = create_mock_full(
{
"isd_as": create_mock_full({"pack()": b"srIA"}),
"host": create_mock_full({"pack()": b"srcH"}),
},
class_=SCIONAddr)
inst.pack = create_mock_full(return_value=b"packed with null checksum")
payload = b"payload"
expected_call = b"".join([
b"dsIA",
b"srIA",
b"dstH",
b"srcH",
b"\x00",
bytes([L4Proto.UDP]),
b"packed with null checksum",
payload,
])
in_cksum.return_value = 0x3412
# Call
ntools.eq_(inst._calc_checksum(payload), bytes.fromhex("3412"))
# Tests
in_cksum.assert_called_once_with(expected_call)
def test_bad_checksum(self, raw):
inst = SCIONUDPHeader()
inst.total_len = 10 + inst.LEN
inst._calc_checksum = create_mock()
inst._calc_checksum.return_value = bytes.fromhex("8888")
inst._checksum = bytes.fromhex("9999")
# Call
ntools.assert_raises(SCIONChecksumFailed, inst.validate, range(10))
def test(self, scapy_checksum):
inst = SCIONUDPHeader()
inst._src = create_mock(["pack"], class_=SCIONAddr)
inst._src.pack.return_value = b"source address"
inst._dst = create_mock(["pack"], class_=SCIONAddr)
inst._dst.pack.return_value = b"destination address"
inst.pack = create_mock()
inst.pack.return_value = b"packed with null checksum"
payload = b"payload"
expected_call = b"".join([
b"source address", b"destination address", bytes([L4Proto.UDP]),
b"packed with null checksum", payload,
])
scapy_checksum.return_value = 0x3412
# Call
ntools.eq_(inst._calc_checksum(payload), bytes.fromhex("1234"))
# Tests
scapy_checksum.assert_called_once_with(expected_call)