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
48 print "Bandwidth:", data / (end - start)
50 logfile.write("%d\t%d\t%d\t%f\t%f\t%f\n"
51 % (self.id, self.transfer_count, data,
52 rtt, start - rtt, end - start))
53 self.transfer_count += 1
55 self.state = STATE_START
57 def process(self, timestamp, packet):
60 self.packets.append(packet)
62 datalen = ip.get_ip_len() - ip.get_header_size() - tcp.get_header_size()
63 data = tcp.get_data_as_string()[0:datalen]
65 if tcp.get_th_sport() == 80:
68 elif tcp.get_th_dport() == 80:
74 seq = (tcp.get_th_seq(), tcp.get_th_seq() + datalen)
75 ack = tcp.get_th_ack()
77 # Previous request finished
78 if self.state == STATE_RESP_START and direction > 0 \
79 and data.startswith('GET /'):
80 self.finish_transfer()
82 # New request seen on an idle connection...
83 if self.state == STATE_START and direction > 0 \
84 and data.startswith('GET /'):
85 self.startseq = seq[1]
86 self.starttime = timestamp
87 self.state = STATE_REQ_SENT
89 # Request is acknowledged, but response not yet seen
90 if self.state == STATE_REQ_SENT and direction < 0 \
91 and seq_after(ack, self.startseq):
92 self.state = STATE_REQ_ACKED
94 self.times.append(((timestamp - self.starttime) / 1e6, 0))
96 # Response header to request has been seen
97 if self.state == STATE_REQ_ACKED and direction < 0 \
98 and data.startswith("HTTP/1."):
99 self.state = STATE_RESP_START
101 # Data packet in response
102 if self.state == STATE_RESP_START and direction < 0 and datalen > 0:
103 self.times.append(((timestamp - self.starttime) / 1e6,
104 seq[1] - self.respseq))
106 def handler(header, data):
109 (sec, us) = header.getts()
110 ts = sec * 1000000 + us
111 if start_time is None:
114 pkt = decoder.decode(data)
118 src = (ip.get_ip_src(), tcp.get_th_sport())
119 dst = (ip.get_ip_dst(), tcp.get_th_dport())
120 flow = tuple(sorted([src, dst]))
121 if flow not in flows:
122 #print "New flow", flow
123 flows[flow] = Connection(flow)
125 flows[flow].process(ts, pkt)
127 def process(filename):
129 p = pcapy.open_offline(filename)
130 p.setfilter(r"ip proto \tcp")
131 assert p.datalink() == pcapy.DLT_EN10MB
132 decoder = impacket.ImpactDecoder.EthDecoder()
135 for c in flows.values():
138 if __name__ == '__main__':
139 for f in sys.argv[1:]: