1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
#!/usr/bin/env python
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Traffic script that listens for incoming BGP connections and verifies
received GBP Open message."""
import sys
import socket
from scapy.main import load_contrib
from scapy.layers.inet import Raw
from scapy.contrib.bgp import BGPHeader, BGPOpen
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def main():
"""Open a TCP listener socket on the default BGP port. Accept an incoming
connection, receive data and verify if data is a valid BGP Open message."""
args = TrafficScriptArg(['rx_ip', 'src_ip', 'rx_port', 'as_number',
'holdtime'])
rx_ip = args.get_arg('rx_ip')
src_ip = args.get_arg('src_ip')
rx_port = int(args.get_arg('rx_port'))
as_number = int(args.get_arg('as_number'))
holdtime = int(args.get_arg('holdtime'))
load_contrib("bgp")
soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
soc.bind((rx_ip, rx_port))
soc.listen(1)
print "Listener active, awaiting connection..."
soc.settimeout(8)
conn, addr = soc.accept()
print 'Connection established with peer:', addr
data = conn.recv(256)
conn.close()
soc.close()
bgp_layer = (BGPHeader(Raw(data).load))
bgp_layer.show()
if not bgp_layer.haslayer(BGPOpen):
raise RuntimeError("Received data is not a BGP OPEN message.")
bgp_open = bgp_layer.getlayer(BGPOpen)
if bgp_open.bgp_id != src_ip:
raise RuntimeError(
"BGP ID mismatch. Received {0} but should be {1}".
format(bgp_open.bgp_id, src_ip))
else:
print "BGP ID matched."
if bgp_open.AS != as_number:
raise RuntimeError(
"BGP AS number mismatch. Received {0} but should be {1}".
format(bgp_open.AS, as_number))
else:
print "BGP AS number matched."
if bgp_open.hold_time != holdtime:
raise RuntimeError(
"Hold Time parameter mismatch. Received {0} but should be {1}.".
format(bgp_layer.getlayer(BGPOpen).holdtime, holdtime))
else:
print "BGP Hold Time parameter matched."
sys.exit(0)
if __name__ == "__main__":
main()
|
