+#!/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 receives an DHCP packet on given interface and check if
+is correct DHCP DISCOVER message.
+"""
+
+import sys
+
+from scapy.layers.inet import UDP_SERVICES
+
+from resources.libraries.python.PacketVerifier import RxQueue
+from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
+
+
+def main():
+ args = TrafficScriptArg(['rx_src_mac'], ['hostname'])
+
+ rx_if = args.get_arg('rx_if')
+ rx_src_mac = args.get_arg('rx_src_mac')
+ hostname = args.get_arg('hostname')
+
+ rx_dst_mac = 'ff:ff:ff:ff:ff:ff'
+ rx_src_ip = '0.0.0.0'
+ rx_dst_ip = '255.255.255.255'
+ boot_request = 1
+ dhcp_magic = 'c\x82Sc'
+
+ rxq = RxQueue(rx_if)
+
+ ether = rxq.recv(10)
+
+ if ether is None:
+ raise RuntimeError("DHCP DISCOVER Rx timeout.")
+
+ if ether.dst != rx_dst_mac:
+ raise RuntimeError("Destination MAC address error.")
+ print "Destination MAC address: OK."
+
+ if ether.src != rx_src_mac:
+ raise RuntimeError("Source MAC address error.")
+ print "Source MAC address: OK."
+
+ if ether['IP'].dst != rx_dst_ip:
+ raise RuntimeError("Destination IP address error.")
+ print "Destination IP address: OK."
+
+ if ether['IP'].src != rx_src_ip:
+ raise RuntimeError("Source IP address error.")
+ print "Source IP address: OK."
+
+ if ether['IP']['UDP'].dport != UDP_SERVICES.bootps:
+ raise RuntimeError("UDP destination port error.")
+ print "UDP destination port: OK."
+
+ if ether['IP']['UDP'].sport != UDP_SERVICES.bootpc:
+ raise RuntimeError("UDP source port error.")
+ print "UDP source port: OK."
+
+ bootp = ether['BOOTP']
+
+ if bootp.op != boot_request:
+ raise RuntimeError("BOOTP message type error.")
+ print "BOOTP message type: OK"
+
+ if bootp.ciaddr != '0.0.0.0':
+ raise RuntimeError("BOOTP client IP address error.")
+ print "BOOTP client IP address: OK"
+
+ if bootp.yiaddr != '0.0.0.0':
+ raise RuntimeError("BOOTP 'your' (client) IP address error.")
+ print "BOOTP 'your' (client) IP address: OK"
+
+ if bootp.siaddr != '0.0.0.0':
+ raise RuntimeError("BOOTP next server IP address error.")
+ print "BOOTP next server IP address: OK"
+
+ if bootp.giaddr != '0.0.0.0':
+ raise RuntimeError("BOOTP relay agent IP address error.")
+ print "BOOTP relay agent IP address: OK"
+
+ chaddr = bootp.chaddr[:bootp.hlen].encode('hex')
+ if chaddr != rx_src_mac.replace(':', ''):
+ raise RuntimeError("BOOTP client hardware address error.")
+ print "BOOTP client hardware address: OK"
+
+ # Check hostname
+ if bootp.sname != 64*'\x00':
+ raise RuntimeError("BOOTP server name error.")
+ print "BOOTP server name: OK"
+
+ # Check boot file
+ if bootp.file != 128*'\x00':
+ raise RuntimeError("BOOTP boot file name error.")
+ print "BOOTP boot file name: OK"
+
+ # Check bootp magic
+ if bootp.options != dhcp_magic:
+ raise RuntimeError("DHCP magic error.")
+ print "DHCP magic: OK"
+
+ # Check options
+ dhcp_options = ether['DHCP options'].options
+
+ # Option 12
+ hn = filter(lambda x: x[0] == 'hostname', dhcp_options)
+ if hostname:
+ try:
+ if hn[0][1] != hostname:
+ raise RuntimeError("Client's hostname doesn't match.")
+ except IndexError:
+ raise RuntimeError("Option list doesn't contain hostname option.")
+ else:
+ if len(hn) != 0:
+ raise RuntimeError("Option list contains hostname option.")
+ print "Option 12 hostname: OK"
+
+ # Option 53
+ mt = filter(lambda x: x[0] == 'message-type', dhcp_options)[0][1]
+ if mt != 1:
+ raise RuntimeError("Option 53 message-type error.")
+ print "Option 53 message-type: OK"
+
+ # Option 55
+ prl = filter(lambda x: x[0] == 'param_req_list', dhcp_options)[0][1]
+ if prl != '\x01\x1c\x02\x03\x0f\x06w\x0c,/\x1ay*':
+ raise RuntimeError("Option 55 param_req_list error.")
+ print "Option 55 param_req_list: OK"
+
+ # Option 255
+ if 'end' not in dhcp_options:
+ raise RuntimeError("end option error.")
+ print "end option: OK"
+
+ sys.exit(0)
+
+
+if __name__ == "__main__":
+ main()
Code Review / csit.git / commitdiff