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tcp_connection.py
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from scapy.all import *
from threading import Thread
from tcp_listener import TCP_IPv6_Listener, TCP_IPv4_Listener
from time import sleep
class TCP_IPv4:
def __init__(self, src, dst, sport, dport, seqno=0, ackno=0, verbose=False):
self.src = src
self.dst = dst
self.sport = sport
self.dport = dport
self.verbose = verbose
self.seq_no = seqno
self.ack_no = ackno
self.tcp_flags = {
'TCP_FIN': 0x01,
'TCP_SYN': 0x02,
'TCP_RST': 0x04,
'TCP_PSH': 0x08,
'TCP_ACK': 0x10,
'TCP_URG': 0x20,
'TCP_ECE': 0x40,
'TCP_CWR': 0x80
}
self.basic_pkt = IP(src=self.src, dst=self.dst)/\
TCP(sport=self.sport, dport=self.dport)
self.listener = TCP_IPv4_Listener(self.src, self.dst, self.sport, self.dport, self.seq_no, self.ack_no, self.verbose)
self.listener_thread = Thread(target=self.listener.listen)
self.listener_thread.start()
def send_pkt(self, pkt, flags):
seqno = self.listener.next_seq
pkt[TCP].flags = flags
pkt[TCP].seq = self.listener.next_seq
pkt[TCP].ack = self.listener.next_ack
print(pkt.summary())
while self.listener.next_seq == seqno:
sr1(pkt, timeout=1, verbose=self.verbose)
sleep(0.5) # Not required, insted use timeout in sr1
def handshake(self):
self.listener.connection_open = True
self.send_pkt(self.basic_pkt, 'S')
def send_data(self, data_layer):
pkt = self.listener.basic_pkt
self.send_pkt(pkt/data_layer, 'PA')
def close(self):
self.listener.src_closed = True
self.finish_pkt()
self.listener_thread.join()
def finish_pkt(self):
pkt = self.listener.basic_pkt
pkt[TCP].flags = 'FA'
pkt[TCP].seq = self.listener.next_seq
pkt[TCP].ack = self.listener.next_ack
send(pkt, verbose=self.verbose)
class TCP_IPv6:
def __init__(self, src, dst, sport, dport, seqno=0, ackno=0, verbose=False):
self.src = src
self.dst = dst
self.sport = sport
self.dport = dport
self.verbose = verbose
self.seq_no = seqno
self.ack_no = ackno
self.tcp_flags = {
'TCP_FIN': 0x01,
'TCP_SYN': 0x02,
'TCP_RST': 0x04,
'TCP_PSH': 0x08,
'TCP_ACK': 0x10,
'TCP_URG': 0x20,
'TCP_ECE': 0x40,
'TCP_CWR': 0x80
}
self.basic_pkt = IPv6(src=self.src, dst=self.dst)/\
TCP(sport=self.sport, dport=self.dport)
self.listener = TCP_IPv6_Listener(self.src, self.dst, self.sport, self.dport, self.seq_no, self.ack_no, self.verbose)
self.listener_thread = Thread(target=self.listener.listen)
self.listener_thread.start()
def send_pkt(self, pkt, flags):
seqno = self.listener.next_seq
pkt[TCP].flags = flags
pkt[TCP].seq = self.listener.next_seq
pkt[TCP].ack = self.listener.next_ack
while self.listener.next_seq == seqno:
sr1(pkt, timeout=1, verbose=self.verbose)
sleep(0.5) # Not required, insted use timeout in sr1
def handshake(self):
self.listener.connection_open = True
self.send_pkt(self.basic_pkt, 'S')
def send_data(self, data_layer):
pkt = self.listener.basic_pkt
self.send_pkt(pkt/data_layer, 'PA')
def close(self):
self.listener.src_closed = True
self.finish_pkt()
self.listener_thread.join()
def finish_pkt(self):
pkt = self.listener.basic_pkt
pkt[TCP].flags = 'FA'
pkt[TCP].seq = self.listener.next_seq
pkt[TCP].ack = self.listener.next_ack
send(pkt, verbose=self.verbose)