def setUp(self):
# TCP - sport: 60655, dport: 80, sec: 0, HLen: 40, Flags: 0x02, win_size: 5840
# cksum: 0x64cb, Options: 0x20
self.frame = b'\xec\xef\x00\x50\xa8\xbd\xea\x4c\x00\x00\x00\x00\xa0\x02\x16\xd0' \
b'\x64\xcb\x00\x00\x02\x04\x05\xb4\x04\x02\x08\x0a\x00\xdc\xd6\x12' \
b'\x00\x00\x00\x00\x01\x03\x03\x06'
self.tcp = TCP(self.frame)
def run(self):
try:
frame = '\x12\x34\x00\x50\x00\x00\x00\x01\x00\x00\x00\x00' \
'\x60\x00\x00\x00\x8d\x5c\x00\x00\x02\x00\x00\x00'
tcp = TCP(frame)
except ImpactPacketException as e:
if str(e) != "'TCP Option length is too low'":
raise e
except:
pass
def reply(ip, tcp):
buf = tcp.get_packet()[:20]
buf = [n for n in buf]
buf[12] = 80
buf = bytes(buf)
tcp = TCP(buf)
ip.contains(tcp)
tcp.swapSourceAndDestination()
return ip, tcp
def run(self):
try:
frame = '\x12\x34\x00\x50\x00\x00\x00\x01\x00\x00\x00\x00' \
'\x60\x00\x00\x00\x8d\x5c\x00\x00\x02\x00\x00\x00'
tcp = TCP(frame)
#except Exception,e:
# print "aaaaaaaaaaaaaaa"
# print e
#except Exception,e:
except ImpactPacketException, e:
if str(e) != "'TCP Option length is too low'":
raise e
buf = [n for n in buf]
buf[12] = 80
buf = bytes(buf)
tcp = TCP(buf)
ip.contains(tcp)
tcp.swapSourceAndDestination()
return ip, tcp
while True:
data, addr = server.recvfrom(4096)
#print(addr, data)
ip = IP(data)
ip_len = ip.get_size()
tcp = TCP(data[ip_len:])
if tcp.get_th_dport() == 1234:
print('state', state)
#buf = tcp.get_packet()
#print([hex(n)[2:] for n in buf])
print(tcp, tcp.get_th_seq(), tcp.get_th_ack())
if state == 0:
ip, tcp = reply(ip, tcp)
tcp.set_th_ack(tcp.get_th_seq() + 1)
tcp.set_th_seq(0)
#print('###', tcp.get_th_seq())
tcp.set_ACK()
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))
