ip, tcp = reply(ip, tcp)
tcp.set_th_ack(tcp.get_th_seq() + data_len)
tcp.set_th_seq(1)
tcp.reset_FIN()
buf = ip.get_packet()
print(tcp, tcp.get_th_seq(), tcp.get_th_ack())
server.sendto(buf, ('127.0.0.1', 0))
tcp.set_FIN()
buf = ip.get_packet()
print(tcp, tcp.get_th_seq(), tcp.get_th_ack())
server.sendto(buf, ('127.0.0.1', 0))
state = 3
else:
tcp_len = tcp.get_size()
head_len = (ip_len + tcp_len)
msg = data[head_len:]
data_len = len(data) - head_len
print(msg)
ip, tcp = reply(ip, tcp)
tcp.set_ACK()
tcp.reset_PSH()
tcp.set_th_ack(tcp.get_th_seq() + data_len)
tcp.set_th_seq(1)
tcp.calculate_checksum()
buf = ip.get_packet()
print(tcp, tcp.get_th_seq(), tcp.get_th_ack())
server.sendto(buf, ('127.0.0.1', 0))
elif state == 3:
print('closed...')
