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)
def tcp_attrib_test():
p = Packet(tlspkt)
assert (p.get_sport() == 443)
assert (p.get_dport() == 59320)
assert (p.get_tcp_cksum() == 0xb8b0)
assert (p.thl == 32)
assert (p.get_opts() == '\x01\x01\x08\x0a\x44\x4e\x98\x3d\x0b\x63\x5a\xdb')
assert (p.get_payload_len() == 95)
assert (p.get_seq() == 0xbdb8019a)
assert (p.get_ack() == 0xa72449c8)
assert (p.get_flags() == 0x18)
old_seq = p.get_seq()
p.set_seq(old_seq + 1)
assert (p.get_seq() == old_seq + 1)
assert (p.get_ack() == 0xa72449c8)
old_ack = p.get_ack()
p.set_ack(old_ack + 1)
assert (p.get_ack() == old_ack + 1)
def tcp_cksum_test():
p = Packet(tlspkt)
before = p.get_tcp_cksum()
p.update_cksum()
after = p.get_tcp_cksum()
assert (before == after)