def HandleDhcpRequest(self, packet):
mac = MAC.from_list(packet.GetHardwareAddress())
request_ip = self._get_requested_ip_from_packet(packet) or \
IP.from_list(packet.GetOption('yiaddr'))
logging.debug("REQUEST: %s requested %s", str(mac), str(request_ip))
if sum(packet.GetOption('giaddr')):
dest_relay_or_gateway = str(IP.from_list(packet.GetOption('giaddr')))
else:
dest_relay_or_gateway = "255.255.255.255"
lease_time = 30000
entry_options = self._calculate_entry_options(str(mac))
ipv4_range_collection = self._get_ipv4_range_collection(entry_options)
try:
if not self.ip_lease_manager.was_last_leased_to(request_ip, mac):
logging.debug("REQUEST: ERROR: %s requested ip not leased to him: %s", str(mac), str(request_ip))
packet.TransformToDhcpNackPacket()
logging.debug("REQUEST: Sent DENY to %s", str(mac))
self.SendDhcpPacketTo(packet, dest_relay_or_gateway, 68)
return
self.ip_lease_manager.lease_ip_address(request_ip, mac, lease_time)
except LeaseError as e:
logging.debug("REQUEST: ERROR: ", str(e))
return
self._set_packet_options(packet, entry_options)
packet.SetOption('yiaddr', list(request_ip))
packet.TransformToDhcpAckPacket()
logging.debug("REQUEST: Sent ACK to %s", str(mac))
self.SendDhcpPacketTo(packet, dest_relay_or_gateway, 68)
def HandleDhcpInform(self, packet):
mac = MAC.from_list(packet.GetHardwareAddress())
logging.debug("GOT: INFORM from " + str(mac))
entry_options = self._calculate_entry_options(str(mac))
ipv4_range_collection = self._get_ipv4_range_collection(entry_options)
self._set_packet_options(packet, entry_options)
client_lease = self.ip_lease_manager.get_lease(mac=mac)
if not client_lease:
return None
ip = IPv4.from_str(client_lease.ip_str)
packet.SetOption('yiaddr', list(ip))
packet.TransformToDhcpAckPacket()
dest_relay_or_gateway = None
if sum(packet.GetOption('giaddr')):
dest_relay_or_gateway = str(IP.from_list(packet.GetOption('giaddr')))
else:
dest_relay_or_gateway = "255.255.255.255"
logging.debug("SENT: ACK")
self.SendDhcpPacketTo(packet, dest_relay_or_gateway, 68)
def HandleDhcpDiscover(self, packet):
mac = MAC.from_list(packet.GetHardwareAddress())
logging.debug("DISCOVER: %s", str(mac))
entry_options = self._calculate_entry_options(str(mac))
ipv4_range_collection = self._get_ipv4_range_collection(entry_options)
self._set_packet_options(packet, entry_options)
backend_ip = entry_options.get('yiaddr', None)
requested_ip = self._get_requested_ip_from_packet(packet)
ip = None
if backend_ip:
ip = IPv4.from_list(backend_ip)
self.ip_lease_manager.reallocate_ip_address(ip)
logging.debug("DISCOVER: %s gets static ip: %s", str(mac), str(ip))
else:
ip = self.ip_lease_manager.allocate_ip_address(ipv4_range_collection, mac, requested_ip=requested_ip)
logging.debug("DISCOVER: %s requested ip %s, giving %s", str(mac), str(requested_ip), str(ip))
packet.SetOption('yiaddr', list(ip))
packet.TransformToDhcpOfferPacket()
logging.debug("DISCOVER: Sent OFFER to %s", str(mac))
self.SendDhcpPacketTo(packet, "255.255.255.255", 68)
def HandleDhcpRelease(self, packet):
mac = MAC.from_list(packet.GetHardwareAddress())
logging.debug("RELEASE: from %s", str(mac))
self.ip_lease_manager.delete_lease(mac=mac)
