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PcapReaderThread.py
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from BufferedPackets import BufferedPackets
from impacket import ImpactDecoder, ImpactPacket
import pcapy
import threading
import time
class PcapReaderThread(threading.Thread):
def __init__(self, filename, protocol, port):
threading.Thread.__init__(self)
self.pcap = pcapy.open_offline(filename)
self.connection_list = []
self.ready_connection_list = []
self.last_read_index = -1
self.done = False
self.port = port
self.protocol = protocol
self.lock = threading.Lock()
self.delete_read_connections = False
print "{} dst port {}".format(self.protocol, self.port)
self.pcap.setfilter("{} dst port {}".format(self.protocol, self.port))
def run(self):
#for i in range (0, 1000):
while not self.done:
(header, frame) = self.pcap.next()
if not header:
self.done = True
break
self.parse_packet(header, frame)
ready_indices = range(0, len(self.connection_list))
self.move_ready_packets(ready_indices)
#self.clean_no_payload()
print "Num of connections : " + str(len(self.ready_connection_list))
self.done = True
def clean_no_payload(self):
try:
self.lock.acquire()
for i in range(len(self.connection_list) - 1, -1, -1):
if len(self.connection_list) == 0:
break
if self.connection_list[i].get_payload_length() == 0 and self.connection_list[i].ready:
del self.connection_list[i]
finally:
self.lock.release()
def parse_packet(self, header, frame):
decoder = ImpactDecoder.EthDecoder()
ether = decoder.decode(frame)
ready_indices = []
if ether.get_ether_type() == ImpactPacket.IP.ethertype:
self.lock.acquire()
for i in range(0, len(self.connection_list)):
buffered_packets = self.connection_list[i]
if buffered_packets.add_frame(ether): #if there's an existing flow
self.lock.release()
if len(ready_indices) > 0:
self.move_ready_packets(ready_indices)
return
if buffered_packets.ready:
ready_indices.append(i)
buffered_packets = BufferedPackets(header, ether)
self.connection_list.append(buffered_packets)
self.lock.release()
if len(ready_indices) > 0:
self.move_ready_packets(ready_indices)
def move_ready_packets(self, ready_indices):
self.lock.acquire()
for i in range(len(ready_indices)-1, -1, -1):
if self.connection_list[i].get_payload_length() > 0:
self.ready_connection_list.append(self.connection_list[i])
del self.connection_list[i]
self.lock.release()
def has_ready_message(self):
self.lock.acquire()
#for buffered_packets in self.ready_connection_list:
# if not buffered_packets.read:
# self.lock.release()
# return True
if not self.delete_read_connections:
if len(self.ready_connection_list)-1 == self.last_read_index:
self.lock.release()
return False
else:
self.lock.release()
return True
else:
if len(self.ready_connection_list) > 0:
self.lock.release()
return True
else:
self.lock.release()
return False
#self.lock.release()
#return False
def pop_connection(self):
self.lock.acquire()
# for id in range(0, len(self.connection_list)):
# if self.connection_list[id].ready and not self.connection_list[id].read:
# bp = self.connection_list[id]
# # del self.connection_list[id]
# bp.read = True
# self.lock.release()
# return bp
if not self.delete_read_connections:
if len(self.ready_connection_list)-1 == self.last_read_index:
self.lock.release()
return None
else:
self.last_read_index += 1
buffered_packets = self.ready_connection_list[self.last_read_index]
buffered_packets.read = True
self.lock.release()
return buffered_packets
else:
if len(self.ready_connection_list) <= 0:
self.lock.release()
return None
else:
buffered_packets = self.ready_connection_list[0]
del self.ready_connection_list[0]
self.lock.release()
return buffered_packets
# self.lock.release()
# return None
def reset_read_status(self):
self.lock.acquire()
# print "Resetting read status"
for buffered_packets in self.ready_connection_list:
buffered_packets.read = False
self.last_read_index = -1
self.lock.release()
def forced_pop_connection(self):
bp = self.connection_list[0]
del self.connection_list[0]
return bp