+++ /dev/null
-#!/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 sends an DHCP OFFER message and checks if the DHCP
-REQUEST contains all required fields."""
-
-import sys
-
-from scapy.layers.l2 import Ether
-from scapy.layers.inet import IP, UDP, UDP_SERVICES
-from scapy.layers.dhcp import BOOTP, DHCP
-
-from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
-from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
-
-
-def is_discover(pkt):
- """If DHCP message type option is set to dhcp discover return True,
- else return False. False is returned also if exception occurs."""
- dhcp_discover = 1
- try:
- dhcp_options = pkt['BOOTP']['DHCP options'].options
- message_type = filter(lambda x: x[0] == 'message-type',
- dhcp_options)
- message_type = message_type[0][1]
- return message_type == dhcp_discover
- except:
- return False
-
-
-def is_request(pkt):
- """If DHCP message type option is DHCP REQUEST return True,
- else return False. False is returned also if exception occurs."""
- dhcp_request = 3
- try:
- dhcp_options = pkt['BOOTP']['DHCP options'].options
- message_type = filter(lambda x: x[0] == 'message-type',
- dhcp_options)
- message_type = message_type[0][1]
- return message_type == dhcp_request
- except:
- return False
-
-
-def main():
- """Main function of the script file."""
- args = TrafficScriptArg(['client_mac', 'server_mac', 'server_ip',
- 'client_ip', 'client_mask'],
- ['hostname', 'offer_xid'])
-
- server_if = args.get_arg('rx_if')
- server_mac = args.get_arg('server_mac')
- server_ip = args.get_arg('server_ip')
-
- client_mac = args.get_arg('client_mac')
- client_ip = args.get_arg('client_ip')
- client_mask = args.get_arg('client_mask')
-
- hostname = args.get_arg('hostname')
- offer_xid = args.get_arg('offer_xid')
-
- rx_src_ip = '0.0.0.0'
- rx_dst_ip = '255.255.255.255'
-
- rxq = RxQueue(server_if)
- txq = TxQueue(server_if)
- sent_packets = []
-
- for _ in range(10):
- dhcp_discover = rxq.recv(10)
- if is_discover(dhcp_discover):
- break
- else:
- raise RuntimeError("DHCP DISCOVER Rx error.")
-
- dhcp_offer = Ether(src=server_mac, dst=dhcp_discover.src)
- dhcp_offer /= IP(src=server_ip, dst="255.255.255.255")
- dhcp_offer /= UDP(sport=67, dport=68)
- dhcp_offer /= BOOTP(op=2,
- # if offer_xid differs from xid value in DHCP DISCOVER
- # the DHCP OFFER has to be discarded
- xid=int(offer_xid) if offer_xid
- else dhcp_discover['BOOTP'].xid,
- yiaddr=client_ip,
- siaddr=server_ip,
- chaddr=dhcp_discover['BOOTP'].chaddr)
- dhcp_offer_options = [("message-type", "offer"), # Option 53
- ("subnet_mask", client_mask), # Option 1
- ("server_id", server_ip), # Option 54, dhcp server
- ("lease_time", 43200), # Option 51
- "end"]
- dhcp_offer /= DHCP(options=dhcp_offer_options)
-
- txq.send(dhcp_offer)
- sent_packets.append(dhcp_offer)
-
- max_other_pkts = 10
- for _ in range(0, max_other_pkts):
- dhcp_request = rxq.recv(5, sent_packets)
- if not dhcp_request:
- raise RuntimeError("DHCP REQUEST Rx timeout.")
- if is_request(dhcp_request):
- break
- else:
- raise RuntimeError("Max RX packet limit reached.")
-
- if offer_xid:
- # if offer_xid differs from xid value in DHCP DISCOVER the DHCP OFFER
- # has to be discarded
- raise RuntimeError("DHCP REQUEST received. DHCP OFFER with wrong XID "
- "has not been discarded.")
-
- # CHECK ETHER, IP, UDP
- if dhcp_request.dst != dhcp_discover.dst:
- raise RuntimeError("Destination MAC error.")
- print "Destination MAC: OK."
-
- if dhcp_request.src != dhcp_discover.src:
- raise RuntimeError("Source MAC error.")
- print "Source MAC: OK."
-
- if dhcp_request['IP'].dst != rx_dst_ip:
- raise RuntimeError("Destination IP error.")
- print "Destination IP: OK."
-
- if dhcp_request['IP'].src != rx_src_ip:
- raise RuntimeError("Source IP error.")
- print "Source IP: OK."
-
- if dhcp_request['IP']['UDP'].dport != UDP_SERVICES.bootps:
- raise RuntimeError("BOOTPs error.")
- print "BOOTPs: OK."
-
- if dhcp_request['IP']['UDP'].sport != UDP_SERVICES.bootpc:
- raise RuntimeError("BOOTPc error.")
- print "BOOTPc: OK."
-
- # CHECK BOOTP
- if dhcp_request['BOOTP'].op != dhcp_discover['BOOTP'].op:
- raise RuntimeError("BOOTP operation error.")
- print "BOOTP operation: OK"
-
- if dhcp_request['BOOTP'].xid != dhcp_discover['BOOTP'].xid:
- raise RuntimeError("BOOTP XID error.")
- print "BOOTP XID: OK"
-
- if dhcp_request['BOOTP'].ciaddr != '0.0.0.0':
- raise RuntimeError("BOOTP ciaddr error.")
- print "BOOTP ciaddr: OK"
-
- ca = dhcp_request['BOOTP'].chaddr[:dhcp_request['BOOTP'].hlen].encode('hex')
- if ca != client_mac.replace(':', ''):
- raise RuntimeError("BOOTP client hardware address error.")
- print "BOOTP client hardware address: OK"
-
- if dhcp_request['BOOTP'].options != dhcp_discover['BOOTP'].options:
- raise RuntimeError("DHCP options error.")
- print "DHCP options: OK"
-
- # CHECK DHCP OPTIONS
- dhcp_options = dhcp_request['DHCP options'].options
-
- 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 50
- ra = filter(lambda x: x[0] == 'requested_addr', dhcp_options)[0][1]
- if ra != client_ip:
- raise RuntimeError("Option 50 requested_addr error.")
- print "Option 50 requested_addr: OK"
-
- # Option 53
- mt = filter(lambda x: x[0] == 'message-type', dhcp_options)[0][1]
- if mt != 3: # request
- raise RuntimeError("Option 53 message-type error.")
- print "Option 53 message-type: OK"
-
- # Option 54
- sid = filter(lambda x: x[0] == 'server_id', dhcp_options)[0][1]
- if sid != server_ip:
- raise RuntimeError("Option 54 server_id error.")
- print "Option 54 server_id: 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 / blobdiff