tests/data_plane/vpp_lite_topo/scripts/dhcp_server.py

   1 from scapy.all import *
   2 from scapy.layers import *
   3
   4 server_ip="6.0.2.2"
   5 client_ip="6.0.1.2"
   6 server_mac="00:0B:CD:AE:9F:C6"
   7 client_mac="aa:a2:a5:ea:54:20"
   8 subnet_mask="255.255.255.0"
   9 gateway="6.0.1.1"
  10
  11 # suboption 1 Agent circuit ID; len:4; val:0x00000001
  12 # suboption 5 Link selection; len:4; val:6.0.1.1
  13 option82 = '\x01\x04\x00\x00\x00\x01\x05\x04\x06\00\x01\x01'
  14
  15 def detect_dhcp(pkt):
  16   # check if we get DHCP discover and send offer message
  17   if pkt[DHCP] and pkt[DHCP].options[0][1] == 1:
  18     sendp(Ether(src=server_mac,dst="ff:ff:ff:ff:ff:ff")/
  19           IP(src=server_ip,dst="6.0.1.1")/
  20           UDP(sport=67,dport=68)/
  21           BOOTP(op=2, yiaddr=client_ip, siaddr=server_ip, giaddr=gateway,
  22                 chaddr=client_mac, xid=pkt[BOOTP].xid)/
  23           DHCP(options=[('message_type', 'offer')])/
  24           DHCP(options=[('subnet_mask',subnet_mask)])/
  25           DHCP(options=[('server_id',server_ip)])/
  26           DHCP(options=[('relay_agent_Information', option82), ('end')]))
  27
  28 #sniff DHCP requests
  29 def start():
  30     sniff(filter="udp and (port 67 or 68)", prn=detect_dhcp, store=0)
  31
  32 start()