diff options
Diffstat (limited to 'resources/traffic_scripts/dhcp/send_and_check_proxy_messages.py')
-rwxr-xr-x | resources/traffic_scripts/dhcp/send_and_check_proxy_messages.py | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/resources/traffic_scripts/dhcp/send_and_check_proxy_messages.py b/resources/traffic_scripts/dhcp/send_and_check_proxy_messages.py new file mode 100755 index 0000000000..27f148c900 --- /dev/null +++ b/resources/traffic_scripts/dhcp/send_and_check_proxy_messages.py @@ -0,0 +1,299 @@ +#!/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 DHCP packets.""" + +import sys + +from scapy.all import Ether +from scapy.layers.inet import IP, UDP +from scapy.layers.inet import UDP_SERVICES +from scapy.layers.dhcp import DHCP, BOOTP + +from resources.libraries.python.PacketVerifier import RxQueue, TxQueue +from resources.libraries.python.TrafficScriptArg import TrafficScriptArg + + +def dhcp_discover(tx_if, rx_if, tx_src_ip, tx_dst_ip, server_ip, proxy_ip, + client_mac): + """Send and check DHCP DISCOVER proxy packet.""" + + rxq = RxQueue(rx_if) + txq = TxQueue(tx_if) + + sent_packets = [] + + dhcp_discover = Ether(src=client_mac, dst="ff:ff:ff:ff:ff:ff") / \ + IP(src=tx_src_ip, dst=tx_dst_ip) / \ + UDP(sport=UDP_SERVICES.bootpc, dport=UDP_SERVICES.bootps) / \ + BOOTP(op=1,) / \ + DHCP(options=[("message-type", "discover"), + "end"]) + + sent_packets.append(dhcp_discover) + txq.send(dhcp_discover) + + ether = rxq.recv(2) + + if ether is None: + raise RuntimeError('DHCP DISCOVER timeout') + + if ether[IP].src != proxy_ip: + raise RuntimeError("Source IP address error.") + print "Source IP address: OK." + + if ether[IP].dst != server_ip: + raise RuntimeError("Destination IP address error.") + print "Destination IP address: OK." + + if ether[UDP].dport != UDP_SERVICES.bootps: + raise RuntimeError("UDP destination port error.") + print "UDP destination port: OK." + + if ether[UDP].sport != UDP_SERVICES.bootpc: + raise RuntimeError("UDP source port error.") + print "UDP source port: OK." + + if ether[DHCP].options[1][0] != 'relay_agent_Information': # option 82 + raise RuntimeError("Relay agent information error.") + option_82 = ether[DHCP].options[1][1] + + if ether[DHCP].options[0][1] != 1: # 1 - DISCOVER message + raise RuntimeError("DHCP DISCOVER message error.") + print "DHCP DISCOVER message OK." + + return option_82 + + +def dhcp_offer(rx_if, tx_if, tx_dst_ip, server_ip, proxy_ip, client_ip, + server_mac, option_82): + """Send and check DHCP OFFER proxy packet.""" + + rxq = RxQueue(rx_if) + txq = TxQueue(tx_if) + + sent_packets = [] + + dhcp_offer = Ether(src=server_mac, dst="ff:ff:ff:ff:ff:ff") / \ + IP(src=server_ip, dst=tx_dst_ip) / \ + UDP(sport=UDP_SERVICES.bootps, dport=UDP_SERVICES.bootpc) / \ + BOOTP(op=2, + yiaddr=client_ip, + siaddr=server_ip) / \ + DHCP(options= + [("message-type", "offer"), + ("server_id", server_ip), + ("relay_agent_Information", option_82), + "end"]) + + txq.send(dhcp_offer) + sent_packets.append(dhcp_offer) + + ether = rxq.recv(2) + + if ether is None: + raise RuntimeError('DHCP OFFER timeout') + + if ether[IP].dst != tx_dst_ip: + raise RuntimeError("Destination IP address error.") + print "Destination IP address: OK." + + if ether[IP].src != proxy_ip: + raise RuntimeError("Source IP address error.") + print "Source IP address: OK." + + if ether[UDP].dport != UDP_SERVICES.bootpc: + raise RuntimeError("UDP destination port error.") + print "UDP destination port: OK." + + if ether[UDP].sport != UDP_SERVICES.bootps: + raise RuntimeError("UDP source port error.") + print "UDP source port: OK." + + if ether[BOOTP].yiaddr != client_ip: + raise RuntimeError("Client IP address error.") + print "Client IP address: OK." + + if ether[BOOTP].siaddr != server_ip: + raise RuntimeError("DHCP server IP address error.") + print "DHCP server IP address: OK." + + if ether[DHCP].options[0][1] != 2: # 2 - OFFER message + raise RuntimeError("DHCP OFFER message error.") + print "DHCP OFFER message OK." + + +def dhcp_request(tx_if, rx_if, tx_src_ip, tx_dst_ip, server_ip, proxy_ip, + client_ip, client_mac): + """Send and check DHCP REQUEST proxy packet.""" + + rxq = RxQueue(rx_if) + txq = TxQueue(tx_if) + + sent_packets = [] + + dhcp_request = Ether(src=client_mac, dst="ff:ff:ff:ff:ff:ff") / \ + IP(src=tx_src_ip, dst=tx_dst_ip) / \ + UDP(sport=UDP_SERVICES.bootpc, dport=UDP_SERVICES.bootps) / \ + BOOTP(op=1, + giaddr=proxy_ip, + siaddr=server_ip) / \ + DHCP(options=[("message-type", "request"), + ("server_id", server_ip), + ("requested_addr", client_ip), + "end"]) + + sent_packets.append(dhcp_request) + txq.send(dhcp_request) + + ether = rxq.recv(2) + + if ether is None: + raise RuntimeError('DHCP REQUEST timeout') + + if ether[IP].dst != server_ip: + raise RuntimeError("Destination IP address error.") + print "Destination IP address: OK." + + if ether[IP].src != proxy_ip: + raise RuntimeError("Source IP address error.") + print "Source IP address: OK." + + if ether[UDP].dport != UDP_SERVICES.bootps: + raise RuntimeError("UDP destination port error.") + print "UDP destination port: OK." + + if ether[UDP].sport != UDP_SERVICES.bootpc: + raise RuntimeError("UDP source port error.") + print "UDP source port: OK." + + if ether[BOOTP].siaddr != server_ip: + raise RuntimeError("DHCP server IP address error.") + print "DHCP server IP address: OK." + + if ether[DHCP].options[2][1] != client_ip: + raise RuntimeError("Requested IP address error.") + print "Requested IP address: OK." + + if ether[DHCP].options[3][0] != 'relay_agent_Information': # option 82 + raise RuntimeError("Relay agent information error.") + + if ether[DHCP].options[0][1] != 3: # 2 - REQUEST message + raise RuntimeError("DHCP REQUEST message error.") + print "DHCP REQUEST message: OK." + + +def dhcp_ack(rx_if, tx_if, tx_dst_ip, server_ip, proxy_ip, client_ip, + server_mac, option_82): + """Send and check DHCP ACK proxy packet.""" + + rxq = RxQueue(rx_if) + txq = TxQueue(tx_if) + + lease_time = 43200 # 12 hours + + sent_packets = [] + + dhcp_ack = Ether(src=server_mac, dst="ff:ff:ff:ff:ff:ff") / \ + IP(src=server_ip, dst=tx_dst_ip) / \ + UDP(sport=UDP_SERVICES.bootps, dport=UDP_SERVICES.bootpc) / \ + BOOTP(op=2, + yiaddr=client_ip, + siaddr=server_ip) / \ + DHCP(options= + [("message-type", "ack"), + ("server_id", server_ip), + ("lease_time", lease_time), + ("relay_agent_Information", option_82), + "end"]) + + txq.send(dhcp_ack) + sent_packets.append(dhcp_ack) + + ether = rxq.recv(2) + + if ether is None: + raise RuntimeError('DHCP ACK timeout') + + if ether[IP].dst != tx_dst_ip: + raise RuntimeError("Destination IP address error.") + print "Destination IP address: OK." + + if ether[IP].src != proxy_ip: + raise RuntimeError("Source IP address error.") + print "Source IP address: OK." + + if ether[UDP].dport != UDP_SERVICES.bootpc: + raise RuntimeError("UDP destination port error.") + print "UDP destination port: OK." + + if ether[UDP].sport != UDP_SERVICES.bootps: + raise RuntimeError("UDP source port error.") + print "UDP source port: OK." + + if ether[BOOTP].yiaddr != client_ip: + raise RuntimeError("Client IP address error.") + print "Client IP address: OK." + + if ether[BOOTP].siaddr != server_ip: + raise RuntimeError("DHCP server IP address error.") + print "DHCP server IP address: OK." + + if ether[DHCP].options[2][1] != lease_time: + raise RuntimeError("DHCP lease time error.") + print "DHCP lease time OK." + + if ether[DHCP].options[0][1] != 5: # 5 - ACK message + raise RuntimeError("DHCP ACK message error.") + print "DHCP ACK message OK." + + +def main(): + """Send DHCP proxy messages.""" + + args = TrafficScriptArg(['server_ip', 'server_mac', 'client_ip', + 'client_mac', 'proxy_ip']) + + tx_if = args.get_arg('tx_if') + rx_if = args.get_arg('rx_if') + + tx_src_ip = "0.0.0.0" + tx_dst_ip = "255.255.255.255" + + server_ip = args.get_arg('server_ip') + client_ip = args.get_arg('client_ip') + proxy_ip = args.get_arg('proxy_ip') + client_mac = args.get_arg('client_mac') + server_mac = args.get_arg('server_mac') + + # DHCP DISCOVER + option_82 = dhcp_discover(tx_if, rx_if, tx_src_ip, tx_dst_ip, server_ip, + proxy_ip, client_mac) + + # DHCP OFFER + dhcp_offer(tx_if, rx_if, tx_dst_ip, server_ip, proxy_ip, client_ip, + server_mac, option_82) + + # DHCP REQUEST + dhcp_request(tx_if, rx_if, tx_src_ip, tx_dst_ip, server_ip, proxy_ip, + client_ip, client_mac) + + # DHCP ACK + dhcp_ack(tx_if, rx_if, tx_dst_ip, server_ip, proxy_ip, client_ip, + server_mac, option_82) + + sys.exit(0) + +if __name__ == "__main__": + main() |