Python Packet.update_cksum Examples

Example #1

def tcp_timestamp_test():
    p = Packet(tlspkt)
    (bef_tsval, _, _) = p.parse_timestamp()
    p.offset_timestamp(4, True)
    (after_tsval, _, _) = p.parse_timestamp()
    assert (bef_tsval + 4 == after_tsval)

    # Verify the TCP checksum
    before = p.get_tcp_cksum()
    p.update_cksum()
    after = p.get_tcp_cksum()
    assert (abs(after - before) == 4)

Example #2

def tcp_cksum_test():
    p = Packet(tlspkt)
    before = p.get_tcp_cksum()
    p.update_cksum()
    after = p.get_tcp_cksum()
    assert (before == after)