3 import impacket, pcapy, re, sys
4 import impacket.ImpactDecoder
15 logfile = open('times.data', 'w')
18 """Compares whether x >= y in sequence number space."""
20 delta = (x - y) % (1 << 32)
21 return delta < (1 << 31)
26 def __init__(self, endpoints):
27 self.endpoints = endpoints
29 self.state = STATE_START
30 self.id = Connection.counter
32 self.transfer_count = 0
33 Connection.counter += 1
35 def finish_transfer(self):
36 if len(self.times) > 0:
37 rtt = self.times[0][0]
39 start = iter(t[0] for t in self.times if t[1] > 0).next()
42 end = self.times[-1][0]
43 data = self.times[-1][1]
44 print "Connection %d Transfer #%d" % (self.id, self.transfer_count)
45 print "Network RTT:", rtt
46 print "Additional response delay:", start - rtt
47 print "Transfer time:", end - start
49 print "Bandwidth:", data / (end - start)
51 logfile.write("%d\t%d\t%d\t%f\t%f\t%f\t# %s\n"
52 % (self.id, self.transfer_count, data,
53 rtt, start - rtt, end - start, self.endpoints))
54 self.transfer_count += 1
56 self.state = STATE_START
58 def process(self, timestamp, packet):
61 self.packets.append(packet)
63 datalen = ip.get_ip_len() - ip.get_header_size() - tcp.get_header_size()
64 data = tcp.get_data_as_string()[0:datalen]
66 if tcp.get_th_sport() == 80:
69 elif tcp.get_th_dport() == 80:
75 seq = (tcp.get_th_seq(), tcp.get_th_seq() + datalen)
76 ack = tcp.get_th_ack()
78 # Previous request finished
79 if self.state == STATE_RESP_START and direction > 0 \
80 and data.startswith('GET /'):
81 self.finish_transfer()
83 # New request seen on an idle connection...
84 if self.state == STATE_START and direction > 0 \
85 and data.startswith('GET /'):
86 self.startseq = seq[1]
87 self.starttime = timestamp
88 self.state = STATE_REQ_SENT
90 # Request is acknowledged, but response not yet seen
91 if self.state == STATE_REQ_SENT and direction < 0 \
92 and seq_after(ack, self.startseq):
93 self.state = STATE_REQ_ACKED
95 self.times.append(((timestamp - self.starttime) / 1e6, 0))
97 # Response header to request has been seen
98 if self.state == STATE_REQ_ACKED and direction < 0 \
99 and data.startswith("HTTP/1."):
100 self.state = STATE_RESP_START
102 # Data packet in response
103 if self.state == STATE_RESP_START and direction < 0 and datalen > 0:
104 self.times.append(((timestamp - self.starttime) / 1e6,
105 seq[1] - self.respseq))
107 def handler(header, data):
110 (sec, us) = header.getts()
111 ts = sec * 1000000 + us
112 if start_time is None:
115 pkt = decoder.decode(data)
119 src = (ip.get_ip_src(), tcp.get_th_sport())
120 dst = (ip.get_ip_dst(), tcp.get_th_dport())
121 flow = tuple(sorted([src, dst]))
122 if flow not in flows:
123 #print "New flow", flow
124 flows[flow] = Connection(flow)
126 flows[flow].process(ts, pkt)
128 def process(filename):
130 p = pcapy.open_offline(filename)
131 p.setfilter(r"ip proto \tcp")
132 assert p.datalink() == pcapy.DLT_EN10MB
133 decoder = impacket.ImpactDecoder.EthDecoder()
136 for c in flows.values():
139 if __name__ == '__main__':
140 for f in sys.argv[1:]: