def RCVD_OFFER(self, pkt):
# send request
request = Ether()/IP()/UDP(sport=68, dport=67)/BOOTP(xid=self.xid)/DHCP()
request[DHCP].options = []
# request[Ether].src = '00:00:00:00:00:01'
request[Ether].dst = 'ff:ff:ff:ff:ff:ff'
request[IP].src = '0.0.0.0'
request[IP].dst = '255.255.255.255'
# request[BOOTP].op = 2
# request[BOOTP].chpad = '\x00'*10
# request[BOOTP].sname = '\x00'*64
# request[BOOTP].file = '\x00'*128
request[BOOTP].chaddr = self.mac
request[BOOTP].flags = self.broadcast
self.msgtype = MSGTYPE(code=53, len=1, type=3)
self.rqstaddr = RQSTADDR(requested_addr=self.your_client_ip)
self.server_id = SERVID(server_id=self.server_id)
request[DHCP].options = [self.msgtype, self.clientmac, self.server_id,
self.rqstaddr, self.hostname]
if self.vendcls_id is not None:
request[DHCP].options.append(self.vendclsid)
request[DHCP].options.append(self.end)
log_scapy.info("Send the DHCP Request")
# request.show()
sendp(request,iface=self._iface )
raise self.WAITING()
def SEND_DISCOVER(self):
# record retry times
self._cur_retry += 1
discover = Ether()/IP()/UDP(sport=68, dport=67)/BOOTP(xid=self.xid)/DHCP()
# discover[DHCP].options = []
# discover[Ether].src = self.mac
discover[Ether].dst = 'ff:ff:ff:ff:ff:ff'
discover[IP].src = '0.0.0.0'
discover[IP].dst = '255.255.255.255'
discover[BOOTP].chaddr = self.mac
discover[BOOTP].flags = self.broadcast
self.msgtype = MSGTYPE(code=53, len=1, type=1)
self.autoconfig = AUTOCONFIG(autoconfig=1)
self.clientmac = CLIENTID(clientmac=self.mac)
self.rqstaddr = RQSTADDR()
self.hostname = HOSTNAME(hostname=self.hostname)
self.end = END(code=255)
default_options = [self.msgtype, self.clientmac, self.autoconfig,
self.rqstaddr, self.hostname]
append_options = []
if self._dhcp_options:
for option in self._dhcp_options:
for i in range(len(default_options)):
if option.__class__.__name__ == default_options[i].__class__.__name__:
default_options[i] = option
else:
append_options.append(option)
discover[DHCP].options = default_options + append_options
if self.vendcls_id is not None:
self.vendclsid = VENDCLSID(vendor_class_id=self.vendcls_id)
discover[DHCP].options.append(self.vendclsid)
discover[DHCP].options.append(self.end)
log_scapy.info("Send the DHCP Discover.")
sendp(discover,iface=self._iface )
raise self.WAITING()
def BEGIN(self):
log_scapy.info('This is the beginning of the automata.')
raise self.SEND_DISCOVER()
def RCVD_ACK(self):
# raise self.WAITING()
log_scapy.info('This is the END state of the automata.')
def ERROR(self):
log_scapy.info("This is ERROR state:Time out.")