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#!/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()
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