def __init__(self, sender_cap_file, receiver_cap_file, rto_file, sender_ip=None, receiver_ip=None, sender_mac = None, receiver_mac = None, sender_port=None, receiver_port=None, nat=False, betabutterfly=True):
self.sender_cap_file = sender_cap_file
self.receiver_cap_file = receiver_cap_file
self.rto_file = rto_file
self.sender_mac = sender_mac
self.receiver_mac = receiver_mac
self.rto_list = RTO_List(self.rto_file)
self.nat = nat
self.betabutterfly = betabutterfly
if self.rto_list.rto_number==0:
return
self.data_sender = TCPCapReader(filename = self.sender_cap_file, my_mac=self.sender_mac)
self.data_sender.summary()
self.ack_sender = TCPCapReader(filename = self.receiver_cap_file, my_mac=self.receiver_mac)
self.ack_sender.summary()
print "self.nat = %s" % self.nat
if sender_ip and sender_port and receiver_ip and receiver_port:
assert(False)
self.sender_ip = sender_ip
self.receiver_ip = receiver_ip
self.sender_port = sender_port
self.receiver_port = receiver_port
ip1 = IPTool.ip2num(self.sender_ip)
ip2 = IPTool.ip2num(self.receiver_ip)
self.flow = Flow((ip1, self.sender_port), (ip2, self.receiver_port))
else:
# f1 = set(self.data_sender.flows_map.keys())
# f2 = set(self.ack_sender.flows_map.keys())
f1 = set([f for f, (s, r, a) in self.data_sender.flows_map.iteritems() if (len(s)>0 and len(r)>0)]) #solo flussi bidirezionali
f2 = set([f for f, (s, r, a) in self.ack_sender.flows_map.iteritems() if (len(s)>0 and len(r)>0)])
bidirectional_flows = f1.intersection(f2)
if len(bidirectional_flows)>1:
print "Too many flows between two peers, we should choose one. Not implemented yet."
assert(False)
elif len(bidirectional_flows)==0:
if not self.nat:
print "No bidirectional flows (maybe there is nat, use --nat option)"
assert(False)
elif self.nat and len(f1)==1 and len(f2)==1:
f1 = list(f1)[0]
f2 = list(f2)[0]
self.nat_connection = NatFlowConnection(f1, f2)
print "Nat Enabled:", self.nat_connection
elif self.nat and (len(f1)>1 or len(f2)>1):
print "Too many flows... You have to choose one manually. Not IMPLEMENTED"
print f1, f2
assert(0)
print "Chosen Flow:", self.flow
else:
print "Unforeseen Event!"
assert(0)
elif len(bidirectional_flows)==1 and not self.nat:
self.flow=list(bidirectional_flows)[0]
else:
print "Unforeseen Event!"
assert(0)
class DeSRTO:
def __init__(self, sender_cap_file, receiver_cap_file, rto_file, sender_ip=None, receiver_ip=None, sender_mac = None, receiver_mac = None, sender_port=None, receiver_port=None, nat=False, betabutterfly=True):
self.sender_cap_file = sender_cap_file
self.receiver_cap_file = receiver_cap_file
self.rto_file = rto_file
self.sender_mac = sender_mac
self.receiver_mac = receiver_mac
self.rto_list = RTO_List(self.rto_file)
self.nat = nat
self.betabutterfly = betabutterfly
if self.rto_list.rto_number==0:
return
self.data_sender = TCPCapReader(filename = self.sender_cap_file, my_mac=self.sender_mac)
self.data_sender.summary()
self.ack_sender = TCPCapReader(filename = self.receiver_cap_file, my_mac=self.receiver_mac)
self.ack_sender.summary()
print "self.nat = %s" % self.nat
if sender_ip and sender_port and receiver_ip and receiver_port:
assert(False)
self.sender_ip = sender_ip
self.receiver_ip = receiver_ip
self.sender_port = sender_port
self.receiver_port = receiver_port
ip1 = IPTool.ip2num(self.sender_ip)
ip2 = IPTool.ip2num(self.receiver_ip)
self.flow = Flow((ip1, self.sender_port), (ip2, self.receiver_port))
else:
# f1 = set(self.data_sender.flows_map.keys())
# f2 = set(self.ack_sender.flows_map.keys())
f1 = set([f for f, (s, r, a) in self.data_sender.flows_map.iteritems() if (len(s)>0 and len(r)>0)]) #solo flussi bidirezionali
f2 = set([f for f, (s, r, a) in self.ack_sender.flows_map.iteritems() if (len(s)>0 and len(r)>0)])
bidirectional_flows = f1.intersection(f2)
if len(bidirectional_flows)>1:
print "Too many flows between two peers, we should choose one. Not implemented yet."
assert(False)
elif len(bidirectional_flows)==0:
if not self.nat:
print "No bidirectional flows (maybe there is nat, use --nat option)"
assert(False)
elif self.nat and len(f1)==1 and len(f2)==1:
f1 = list(f1)[0]
f2 = list(f2)[0]
self.nat_connection = NatFlowConnection(f1, f2)
print "Nat Enabled:", self.nat_connection
elif self.nat and (len(f1)>1 or len(f2)>1):
print "Too many flows... You have to choose one manually. Not IMPLEMENTED"
print f1, f2
assert(0)
print "Chosen Flow:", self.flow
else:
print "Unforeseen Event!"
assert(0)
elif len(bidirectional_flows)==1 and not self.nat:
self.flow=list(bidirectional_flows)[0]
else:
print "Unforeseen Event!"
assert(0)
def summary(self):
print "_"*80
print "Sender CAP File = %s" % self.sender_cap_file
print "Receiver CAP File = %s" % self.receiver_cap_file
print "RTO List = %s" % self.rto_file
if self.rto_list.rto_number==0:
print "No RTO"
elif not self.nat:
print "Searching RTO for flow %s" % self.flow
else:
print "Searching RTO for flow %s" % self.nat_connection
print "_"*80
print
def analyse(self, output_filename="tmp_rto_srto.txt"):
self.report = []
self.errors = 0
if self.rto_list.rto_number==0:
return
data_sender = self.data_sender
ack_sender = self.ack_sender
if not self.nat:
sender_flow = self.flow
receiver_flow = self.flow
else:
sender_flow = self.nat_connection.flow_A
receiver_flow = self.nat_connection.flow_B
MAX_TIME_TO_LOOK_FOR_ACK=20
print "Examining %d RTO(s)" % self.rto_list.rto_number
for wcid, seq, nsec in self.rto_list:
print "=" * 20, wcid, seq, nsec, "="*20
sys.stdout.flush()
rto_time = nsec/1000000000.
is_nrto=True
strange_case = False
print "Looking for segment (seq: %d, t = %0.3f s) on sender" % (seq, rto_time)
uno = data_sender.find_sent_seq_before_t(sender_flow, seq, rto_time) #ip_id, position = uno
if uno is None:
print "Cannot find rto segments... maybe it was dropped by the kernel. All the results from this files could be wrong"
self.errors+=1
continue
assert(uno is not None)
print "Looking for segment (seq=%d - ip.id = %d) on the receiver" %(seq, uno[0])
due = ack_sender.find_rcvd_seq(receiver_flow, seq, uno[0])
#ip_id, position = due
if due:
#trovo tempo di arrivo del pacchetto ritrasmesso
#print "trovo tempo di arrivo del pacchetto ritrasmesso"
print "Looking for the retransmission on the sender (seq=%d - index=%d)" %(seq, uno[1]+1)
retrasmitted_pkt = data_sender.find_sent_seq_repacked(flow=sender_flow, seq=seq, from_index = uno[1]+1) #position, packet
if retrasmitted_pkt is None:
print "It seems that traces aren't complete..." #se è un rto, allora ci sarà sicuramente una ritrasmissione
self.errors+=1
break
assert(retrasmitted_pkt is not None)
assert(retrasmitted_pkt[0] != uno[1])
# mi serve il primo pacchetto ritrasmesso che arriva a destinazione
while True:
print "Looking for the retransmission on the receiver (seq=%d, id=%d)" %(retrasmitted_pkt[1]["TCP"].seq, retrasmitted_pkt[1]["IP"].id)
rcvd_retrasmission = ack_sender.find_rcvd_seq(flow=receiver_flow, seq=retrasmitted_pkt[1]["TCP"].seq, ip_id=retrasmitted_pkt[1]["IP"].id) # (ip_id, position)
while rcvd_retrasmission is None:
print "Retransmission Lost. Looking for first retransmitted packet"
nn = retrasmitted_pkt[0]+1
retrasmitted_pkt = (nn, data_sender.get_scapy_packet_in_flow(flow=sender_flow, number=nn) )
if not retrasmitted_pkt[1].is_sent:
continue
print "Looking for retransmitted packet on the receiver (seq:%d - ip.id=%d)" % (retrasmitted_pkt[1]["TCP"].seq, retrasmitted_pkt[1]["IP"].id)
rcvd_retrasmission = ack_sender.find_rcvd_seq(flow=receiver_flow, seq=retrasmitted_pkt[1]["TCP"].seq, ip_id=retrasmitted_pkt[1]["IP"].id) # (ip_id, position)
time_rcvd_retransmission = ack_sender.get_scapy_packet_in_flow(flow=receiver_flow, number=rcvd_retrasmission[1]).time
if rcvd_retrasmission is not None:
break
print "Looking for sent segments on the sender, from index %d (first rto segmnet) to t<%.3f (time of send of last successufull retrasmission)" %(uno[1], retrasmitted_pkt[1].time)
sent_packets_in_window = [] # comprensivi del primo
i = uno[1] # position
while True:
packet = data_sender.get_scapy_packet_in_flow(flow=sender_flow, number=i)
i+=1
if packet is None or not packet.is_sent:
continue
elif packet.time<retrasmitted_pkt[1].time: #changed to < from <=
sent_packets_in_window.append(packet)
else:
break
#assert(retrasmitted_pkt not in sent_packets_in_window) ///MMMMMMMMM, mi sa che è il contrario
#assert(retrasmitted_pkt in sent_packets_in_window) #OK
#trovo i corrispondenti pacchetti ricevuti in una finestra
print "Looking for the corresponding received segments ",
sys.stdout.flush()
#print "trovo i corrispondenti pacchetti ricevuti in una finestra"
rcvd_window_pkts = []
for pkt in sent_packets_in_window:
id_ = pkt["IP"].id
seq_ = pkt["TCP"].seq
rcvd_pkt = ack_sender.find_rcvd_seq(receiver_flow, seq_, id_) # (ip_id, position)
if rcvd_pkt is not None:
rcvd_window_pkts.append(rcvd_pkt)
print ".",
sys.stdout.flush()
assert(len(rcvd_window_pkts)>0)
t_rcvd_windows_pkts = [(ack_sender.get_scapy_packet_in_flow(flow=receiver_flow, number=position)).time for ip_id, position in rcvd_window_pkts]
assert(len(t_rcvd_windows_pkts)>0)
if time_rcvd_retransmission < max(t_rcvd_windows_pkts):
print "Reordering, let's hope to not have strange cases"
positions_rcvd_pkts = [position for ip_id, position in rcvd_window_pkts]
uno_packet = data_sender.get_scapy_packet_in_flow(flow=sender_flow, number=uno[1])
ack_to_find = uno_packet["TCP"].seq + len(uno_packet["TCP"].payload)+1
#if uno_packet["TCP"].flags
print "Looking for sent acks [acks=%d] from the receiver till the first packet after the retransmitted ones" % ack_to_find
ack_to_finds = []
ack_to_finds_timestamp={}
for i in range(min(positions_rcvd_pkts), max(positions_rcvd_pkts)+2):###################### first packet after max
pkt = ack_sender.get_scapy_packet_in_flow(flow=receiver_flow, number=i)
#if pkt is None or pkt.is_sent is False:
if pkt is None or pkt.is_sent is True:
continue
if pkt["TCP"].ack>=ack_to_find:
code = (pkt["IP"].id, pkt["TCP"].ack)
ack_to_finds.append(code)
ack_to_finds_timestamp[code]=pkt.time
print "Looking for received acks on the sender"
assert(len(ack_to_finds)>0)
for code in ack_to_finds:
ip_id, ack = code
tmp = data_sender.find_rcvd_ack(flow=sender_flow, ack=ack, ip_id=ip_id)
if tmp is None:
continue
pkt = data_sender.get_scapy_packet_in_flow(flow=sender_flow, number=tmp[1])
assert(pkt is not None)
assert(not pkt.is_sent)
is_nrto = False
if ack_to_finds_timestamp[code] > time_rcvd_retransmission:
print "Ack received was sent after the receipt of the retransmission"
strange_case = True
break
if is_nrto and max(ack_to_finds_timestamp.values()) > time_rcvd_retransmission:
strange_case = True
else:
print "Packet lost"
rto_type_code = 0
if not is_nrto:
rto_type_code |= 0x1
if strange_case:
rto_type_code |= 0x10
if not strange_case:
if is_nrto:
print "NRTO"
rto_type = "NRTO"
else:
print "SRTO"
rto_type = "SRTO"
elif self.betabutterfly is True:
print "Butterfly"
if is_nrto:
print "NRTO"
rto_type = "ButterflyNRTO"
else:
print "SRTO"
rto_type = "ButterflySRTO"
else:
print "Butterfly"
rto_type = "ButterflyRTO"
self.report.append((wcid, seq, nsec, rto_type, rto_type_code))
def dump_report(self, filename=None):
saveout = sys.stdout
srto_number = 0
butterfly_number = 0
if filename is not None:
fout = open(filename, 'a')
sys.stdout = fout
if self.errors > 0:
print "Traces are damaged"
else:
for wcid, seq, nsec, rto_type, rto_type_code in self.report:
print wcid, seq, nsec, rto_type
if (rto_type_code & 0x1):
srto_number+=1
if (rto_type_code & 0x10):
butterfly_number+=1
self.summary()
print "RTO examined = %d" % len(self.report)
print "SRTO = %d" % srto_number
print "Butterfly = %d" % butterfly_number
print "-"*72
sys.stdout = saveout
if filename is not None:
fout.close()