def __contains__(self, item):
item = IPAddr(item)
if item in self.removed: return False
n = item.toUnsigned()
mask = (1 << self.host_size) - 1
nm = (n & mask) | self.network.toUnsigned()
if nm != n: return False
if (n & mask) == mask:
return False
if (n & mask) < self.first:
return False
if (n & mask) > self.last:
return False
return True
def __init__(self, ip_address="192.168.0.254", router_address=(), dns_address=(), pool=None, subnet=None,
install_flow=True):
super(Dhcpd, self).__init__()
def fix_addr(addr, backup):
if addr is None:
return None
if addr is ():
return IPAddr(backup)
return IPAddr(addr)
self._install_flow = install_flow
self.ip_addr = IPAddr(ip_address)
self.router_addr = fix_addr(router_address, ip_address)
self.dns_addr = fix_addr(dns_address, self.router_addr)
if pool is None:
self.pool = [IPAddr("192.168.0." + str(x)) for x in range(100, 199)]
self.subnet = IPAddr(subnet or "255.255.255.0")
else:
self.pool = pool
self.subnet = subnet
if hasattr(pool, 'subnet_mask'):
self.subnet = pool.subnet_mask
if self.subnet is None:
raise RuntimeError("You must specify a subnet mask or use a pool with a subnet hint")
self.lease_time = 180
# TODO: Actually make them expire :)
self.offers = {} # Eth -> IP we offered
self.leases = {} # Eth -> IP we leased
if self.ip_addr in self.pool:
LOG.debug("Removing my own IP (%s) from address pool", self.ip_addr)
self.pool.remove(self.ip_addr)
def __init__(self, network="192.168.0.0/24", first=1, last=None,
count=None):
"""
Simple subnet-based address pool
Allocates count IP addresses out of network/network_size, starting
with the first'th. You may specify the end of the range with either
last (to specify the last'th address to use) or count to specify the
number to use. If both are None, use up to the end of all
legal addresses.
Example for all of 192.168.x.x/16:
SimpleAddressPool("192.168.0.0/16", 1, 65534)
"""
network, network_size = parse_cidr(network)
self.first = first
self.network_size = network_size
self.host_size = 32 - network_size
self.network = IPAddr(network)
if last is None and count is None:
self.last = (1 << self.host_size) - 2
elif last is not None:
self.last = last
elif count is not None:
self.last = self.first + count - 1
else:
raise RuntimeError("Cannot specify both last and count")
self.removed = set()
if self.count <= 0: raise RuntimeError("Bad first/last range")
if first == 0: raise RuntimeError("Can't allocate 0th address")
if self.host_size < 0 or self.host_size > 32:
raise RuntimeError("Bad network")
if IPAddr(self.last | self.network.toUnsigned()) not in self:
raise RuntimeError("Bad first/last range")
class SimpleAddressPool(AddressPool):
"""
Simple AddressPool for simple subnet based pools.
"""
def __init__(self, network="192.168.0.0/24", first=1, last=None,
count=None):
"""
Simple subnet-based address pool
Allocates count IP addresses out of network/network_size, starting
with the first'th. You may specify the end of the range with either
last (to specify the last'th address to use) or count to specify the
number to use. If both are None, use up to the end of all
legal addresses.
Example for all of 192.168.x.x/16:
SimpleAddressPool("192.168.0.0/16", 1, 65534)
"""
network, network_size = parse_cidr(network)
self.first = first
self.network_size = network_size
self.host_size = 32 - network_size
self.network = IPAddr(network)
if last is None and count is None:
self.last = (1 << self.host_size) - 2
elif last is not None:
self.last = last
elif count is not None:
self.last = self.first + count - 1
else:
raise RuntimeError("Cannot specify both last and count")
self.removed = set()
if self.count <= 0: raise RuntimeError("Bad first/last range")
if first == 0: raise RuntimeError("Can't allocate 0th address")
if self.host_size < 0 or self.host_size > 32:
raise RuntimeError("Bad network")
if IPAddr(self.last | self.network.toUnsigned()) not in self:
raise RuntimeError("Bad first/last range")
def __repr__(self):
return str(self)
def __str__(self):
t = self.network.toUnsigned()
t = (IPAddr(t | self.first), IPAddr(t | self.last))
return "<Addresses from %s to %s>" % t
@property
def subnet_mask(self):
return IPAddr(((1 << self.network_size) - 1) << self.host_size)
@property
def count(self):
return self.last - self.first + 1
def __contains__(self, item):
item = IPAddr(item)
if item in self.removed: return False
n = item.toUnsigned()
mask = (1 << self.host_size) - 1
nm = (n & mask) | self.network.toUnsigned()
if nm != n: return False
if (n & mask) == mask:
return False
if (n & mask) < self.first:
return False
if (n & mask) > self.last:
return False
return True
def append(self, item):
item = IPAddr(item)
if item not in self.removed:
if item in self:
raise RuntimeError("%s is already in this pool" % (item,))
else:
raise RuntimeError("%s does not belong in this pool" % (item,))
self.removed.remove(item)
def remove(self, item):
item = IPAddr(item)
if item not in self:
raise RuntimeError("%s not in this pool" % (item,))
self.removed.add(item)
def __len__(self):
return (self.last - self.first + 1) - len(self.removed)
def __getitem__(self, index):
if index < 0:
raise RuntimeError("Negative indices not allowed")
if index >= len(self):
raise IndexError("Item does not exist")
c = self.first
# Use a heuristic to find the first element faster (we hope)
# Note this means that removing items changes the order of
# our "list".
c += len(self.removed)
while c > self.last:
c -= self.count
while True:
addr = IPAddr(c | self.network.toUnsigned())
if addr not in self.removed:
assert addr in self
index -= 1
if index < 0:
return addr
c += 1
if c > self.last:
c -= self.count
def _respond_dhcp(self, datapath, port, pool,
pkt_ethernet, pkt_vlan, pkt_ip, pkt_udp, pkt_dhcp):
# DHCP message type code
options = dict()
for option in pkt_dhcp.options.option_list:
options[option.tag] = option.value
src = pkt_dhcp.chaddr
# RESPONSE MSG
pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=pkt_ethernet.ethertype,
dst=pkt_ethernet.src,
src='00:00:00:00:00:00'))
if pkt_vlan:
pkt.add_protocol(vlan.vlan(cfi=pkt_vlan.cfi,
ethertype=pkt_vlan.ethertype,
pcp=pkt_vlan.pcp,
vid=pkt_vlan.vid))
pkt.add_protocol(ipv4.ipv4(src=pkt_ip.dst, dst=pkt_ip.src, proto=in_proto.IPPROTO_UDP))
pkt.add_protocol(udp.udp(src_port=pkt_udp.dst_port, dst_port=pkt_udp.src_port))
# DISCOVER MSG
dhcp_msg_type = ord(options[dhcp.DHCP_MESSAGE_TYPE_OPT])
if dhcp_msg_type == dhcp.DHCP_DISCOVER:
msg_type = dhcp.DHCP_OFFER
if src in self.leases:
offer = self.leases[src]
del self.leases[src]
self.offers[src] = offer
else:
offer = self.offers.get(src)
if offer is None:
if len(pool) == 0:
LOG.error("Out of IP addresses")
msg_type = dhcp.DHCP_NAK
offer = pool[0]
if dhcp.DHCP_REQUESTED_IP_ADDR_OPT in options:
wanted_ip = IPAddr(addrconv.ipv4.bin_to_text(options[dhcp.DHCP_REQUESTED_IP_ADDR_OPT].value))
if wanted_ip in pool:
offer = wanted_ip
pool.remove(offer)
self.offers[src] = offer
wanted_opts = list()
if dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT in options:
fmt = "s" * len(options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
wanted_opt_set = struct.unpack(fmt, options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
for i in wanted_opt_set:
wanted_opts.append(ord(i))
option_list = list()
option_list.append(dhcp.option(dhcp.DHCP_MESSAGE_TYPE_OPT, chr(msg_type), length=1))
if msg_type is not dhcp.DHCP_NAK:
if dhcp.DHCP_SUBNET_MASK_OPT in wanted_opts:
option_list.append(dhcp.option(dhcp.DHCP_SUBNET_MASK_OPT,
addrconv.ipv4.text_to_bin(self.subnet.toStr()),
length=4))
if dhcp.DHCP_GATEWAY_ADDR_OPT in wanted_opts and self.router_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_GATEWAY_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.router_addr.toStr()),
length=4))
if dhcp.DHCP_DNS_SERVER_ADDR_OPT in wanted_opts and self.dns_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_DNS_SERVER_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.dns_addr.toStr()),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_IP_ADDR_LEASE_TIME_OPT,
chr(self.lease_time),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_RENEWAL_TIME_OPT, chr(self.lease_time / 2), length=4))
option_list.append(dhcp.option(dhcp.DHCP_REBINDING_TIME_OPT, chr(self.lease_time * 7 / 8), length=4))
resp_options = dhcp.options(option_list=option_list)
pkt.add_protocol(dhcp.dhcp(op=self._MSG_TYPE_BOOT_REPLY, chaddr=pkt_dhcp.chaddr, options=resp_options,
xid=pkt_dhcp.xid, ciaddr=pkt_dhcp.ciaddr, yiaddr=offer.toStr(),
siaddr=self.ip_addr.toStr(), giaddr='0.0.0.0', sname='', boot_file=''))
# REQUEST MSG
if dhcp_msg_type == dhcp.DHCP_REQUEST:
msg_type = dhcp.DHCP_ACK
if dhcp.DHCP_REQUESTED_IP_ADDR_OPT not in options:
return
wanted_ip = IPAddr(addrconv.ipv4.bin_to_text(options[dhcp.DHCP_REQUESTED_IP_ADDR_OPT]))
got_ip = None
if src in self.leases:
if wanted_ip != self.leases[src]:
pool.append(self.leases[src])
del self.leases[src]
else:
got_ip = self.leases[src]
if got_ip is None:
if src in self.offers:
if wanted_ip != self.offers[src]:
pool.append(self.offers[src])
del self.offers[src]
else:
got_ip = self.offers[src]
if got_ip is None:
if wanted_ip in pool:
pool.remove(wanted_ip)
got_ip = wanted_ip
if got_ip is None:
LOG.warn("%s asked for un-offered %s", src, wanted_ip.toStr())
msg_type = dhcp.DHCP_NAK
wanted_opts = list()
if dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT in options:
fmt = "s" * len(options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
wanted_opt_set = struct.unpack(fmt, options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
for i in wanted_opt_set:
wanted_opts.append(ord(i))
# DHCP options tag code
option_list = list()
option_list.append(dhcp.option(dhcp.DHCP_MESSAGE_TYPE_OPT, chr(msg_type), length=1))
if msg_type is not dhcp.DHCP_NAK:
if dhcp.DHCP_SUBNET_MASK_OPT in wanted_opts:
option_list.append(dhcp.option(dhcp.DHCP_SUBNET_MASK_OPT,
addrconv.ipv4.text_to_bin(self.subnet.toStr()),
length=4))
if dhcp.DHCP_GATEWAY_ADDR_OPT in wanted_opts and self.router_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_GATEWAY_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.router_addr.toStr()),
length=4))
if dhcp.DHCP_DNS_SERVER_ADDR_OPT in wanted_opts and self.dns_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_DNS_SERVER_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.dns_addr.toStr()),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_IP_ADDR_LEASE_TIME_OPT,
chr(self.lease_time),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_RENEWAL_TIME_OPT, chr(self.lease_time / 2), length=4))
option_list.append(dhcp.option(dhcp.DHCP_REBINDING_TIME_OPT, chr(self.lease_time * 7 / 8), length=4))
resp_options = dhcp.options(option_list=option_list)
pkt.add_protocol(dhcp.dhcp(op=self._MSG_TYPE_BOOT_REPLY, chaddr=pkt_dhcp.chaddr, options=resp_options,
xid=pkt_dhcp.xid, ciaddr=pkt_dhcp.ciaddr, yiaddr=wanted_ip.toStr(),
siaddr=self.ip_addr.toStr(), giaddr='0.0.0.0', sname='', boot_file=''))
# RELEASE MSG
if dhcp_msg_type == dhcp.DHCP_RELEASE:
if self.leases.get(src).toStr() != pkt_dhcp.ciaddr:
LOG.warn("%s tried to release unleased %s" % (src, pkt_dhcp.ciaddr))
return
del self.leases[src]
pool.append(pkt_dhcp.ciaddr)
LOG.info("%s released %s" % (src, pkt_dhcp.ciaddr))
self._send_dhcp_reply(datapath, port, pkt)
return True
class Dhcpd(app_manager.RyuApp):
_MSG_TYPE_BOOT_REPLY = 2
_MSG_TYPE_BOOT_REQ = 1
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, ip_address="192.168.0.254", router_address=(), dns_address=(), pool=None, subnet=None,
install_flow=True):
super(Dhcpd, self).__init__()
def fix_addr(addr, backup):
if addr is None:
return None
if addr is ():
return IPAddr(backup)
return IPAddr(addr)
self._install_flow = install_flow
self.ip_addr = IPAddr(ip_address)
self.router_addr = fix_addr(router_address, ip_address)
self.dns_addr = fix_addr(dns_address, self.router_addr)
if pool is None:
self.pool = [IPAddr("192.168.0." + str(x)) for x in range(100, 199)]
self.subnet = IPAddr(subnet or "255.255.255.0")
else:
self.pool = pool
self.subnet = subnet
if hasattr(pool, 'subnet_mask'):
self.subnet = pool.subnet_mask
if self.subnet is None:
raise RuntimeError("You must specify a subnet mask or use a pool with a subnet hint")
self.lease_time = 180
# TODO: Actually make them expire :)
self.offers = {} # Eth -> IP we offered
self.leases = {} # Eth -> IP we leased
if self.ip_addr in self.pool:
LOG.debug("Removing my own IP (%s) from address pool", self.ip_addr)
self.pool.remove(self.ip_addr)
# core.openflow.addListeners(self)
def _get_pool(self):
return self.pool
def add_dhcp_flow(self, datapath):
ofproto = datapath.ofproto
match = datapath.ofproto_parser.OFPMatch(eth_type=ether.ETH_TYPE_IP,
ip_proto=inet.IPPROTO_UDP,
udp_src=68,
udp_dst=67)
actions = [datapath.ofproto_parser.OFPActionOutput(datapath.ofproto_parser.OFPP_CONTROLLER)]
instructions = [datapath.ofproto_parser.OFPInstructionActions(
ofproto.OFPIT_APPLY_ACTIONS, actions)]
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, cookie=0, cookie_mask=0, table_id=0,
command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
priority=1, buffer_id=ofproto.OFP_NO_BUFFER,
flags=0, match=match, instructions=instructions)
datapath.send_msg(mod)
@log_helpers.log_method_call
def _send_dhcp_reply(self, datapath, port, pkt):
ofp = datapath.ofproto
ofpp = datapath.ofproto_parser
pkt.serialize()
data = pkt.data
actions = [ofpp.OFPActionOutput(port=port)]
out = ofpp.OFPPacketOut(datapath=datapath,
buffer_id=ofp.OFP_NO_BUFFER,
in_port=ofp.OFPP_CONTROLLER,
actions=actions,
data=data)
datapath.send_msg(out)
@handler.set_ev_cls(ofp_event.EventOFPPacketIn, handler.MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
"""Check a packet-in message.
Build and output an dhcp reply if a packet-in message is
an dhcp packet.
"""
msg = ev.msg
LOG.debug("packet-in msg %s", msg)
datapath = msg.datapath
port = msg.match['in_port']
# NOTE: Ryu packet library can raise various exceptions on a corrupted packet.
try:
pkt = packet.Packet(msg.data)
except Exception as e:
LOG.debug("Unparsable packet: got exception %s", e)
return
LOG.debug("packet-in dpid %(dpid)s in_port %(port)s pkt %(pkt)s",
{'dpid': dpid_lib.dpid_to_str(datapath.id),
'port': port, 'pkt': pkt})
pkt_ethernet = pkt.get_protocol(ethernet.ethernet)
if not pkt_ethernet:
LOG.debug("drop non-ethernet packet")
return
pkt_vlan = pkt.get_protocol(vlan.vlan)
pkt_ip = pkt.get_protocol(ipv4.ipv4)
if pkt_ip is None:
return
pkt_udp = pkt.get_protocol(udp.udp)
if pkt_udp is None:
return
pkt_dhcp = pkt.get_protocol(dhcp.dhcp)
if pkt_dhcp is None:
LOG.debug("drop non-dhcp packet")
return
pool = self._get_pool()
if pool is None:
return
self._respond_dhcp(datapath, port, pool, pkt_ethernet, pkt_vlan, pkt_ip, pkt_udp, pkt_dhcp)
def _respond_dhcp(self, datapath, port, pool,
pkt_ethernet, pkt_vlan, pkt_ip, pkt_udp, pkt_dhcp):
# DHCP message type code
options = dict()
for option in pkt_dhcp.options.option_list:
options[option.tag] = option.value
src = pkt_dhcp.chaddr
# RESPONSE MSG
pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=pkt_ethernet.ethertype,
dst=pkt_ethernet.src,
src='00:00:00:00:00:00'))
if pkt_vlan:
pkt.add_protocol(vlan.vlan(cfi=pkt_vlan.cfi,
ethertype=pkt_vlan.ethertype,
pcp=pkt_vlan.pcp,
vid=pkt_vlan.vid))
pkt.add_protocol(ipv4.ipv4(src=pkt_ip.dst, dst=pkt_ip.src, proto=in_proto.IPPROTO_UDP))
pkt.add_protocol(udp.udp(src_port=pkt_udp.dst_port, dst_port=pkt_udp.src_port))
# DISCOVER MSG
dhcp_msg_type = ord(options[dhcp.DHCP_MESSAGE_TYPE_OPT])
if dhcp_msg_type == dhcp.DHCP_DISCOVER:
msg_type = dhcp.DHCP_OFFER
if src in self.leases:
offer = self.leases[src]
del self.leases[src]
self.offers[src] = offer
else:
offer = self.offers.get(src)
if offer is None:
if len(pool) == 0:
LOG.error("Out of IP addresses")
msg_type = dhcp.DHCP_NAK
offer = pool[0]
if dhcp.DHCP_REQUESTED_IP_ADDR_OPT in options:
wanted_ip = IPAddr(addrconv.ipv4.bin_to_text(options[dhcp.DHCP_REQUESTED_IP_ADDR_OPT].value))
if wanted_ip in pool:
offer = wanted_ip
pool.remove(offer)
self.offers[src] = offer
wanted_opts = list()
if dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT in options:
fmt = "s" * len(options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
wanted_opt_set = struct.unpack(fmt, options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
for i in wanted_opt_set:
wanted_opts.append(ord(i))
option_list = list()
option_list.append(dhcp.option(dhcp.DHCP_MESSAGE_TYPE_OPT, chr(msg_type), length=1))
if msg_type is not dhcp.DHCP_NAK:
if dhcp.DHCP_SUBNET_MASK_OPT in wanted_opts:
option_list.append(dhcp.option(dhcp.DHCP_SUBNET_MASK_OPT,
addrconv.ipv4.text_to_bin(self.subnet.toStr()),
length=4))
if dhcp.DHCP_GATEWAY_ADDR_OPT in wanted_opts and self.router_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_GATEWAY_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.router_addr.toStr()),
length=4))
if dhcp.DHCP_DNS_SERVER_ADDR_OPT in wanted_opts and self.dns_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_DNS_SERVER_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.dns_addr.toStr()),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_IP_ADDR_LEASE_TIME_OPT,
chr(self.lease_time),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_RENEWAL_TIME_OPT, chr(self.lease_time / 2), length=4))
option_list.append(dhcp.option(dhcp.DHCP_REBINDING_TIME_OPT, chr(self.lease_time * 7 / 8), length=4))
resp_options = dhcp.options(option_list=option_list)
pkt.add_protocol(dhcp.dhcp(op=self._MSG_TYPE_BOOT_REPLY, chaddr=pkt_dhcp.chaddr, options=resp_options,
xid=pkt_dhcp.xid, ciaddr=pkt_dhcp.ciaddr, yiaddr=offer.toStr(),
siaddr=self.ip_addr.toStr(), giaddr='0.0.0.0', sname='', boot_file=''))
# REQUEST MSG
if dhcp_msg_type == dhcp.DHCP_REQUEST:
msg_type = dhcp.DHCP_ACK
if dhcp.DHCP_REQUESTED_IP_ADDR_OPT not in options:
return
wanted_ip = IPAddr(addrconv.ipv4.bin_to_text(options[dhcp.DHCP_REQUESTED_IP_ADDR_OPT]))
got_ip = None
if src in self.leases:
if wanted_ip != self.leases[src]:
pool.append(self.leases[src])
del self.leases[src]
else:
got_ip = self.leases[src]
if got_ip is None:
if src in self.offers:
if wanted_ip != self.offers[src]:
pool.append(self.offers[src])
del self.offers[src]
else:
got_ip = self.offers[src]
if got_ip is None:
if wanted_ip in pool:
pool.remove(wanted_ip)
got_ip = wanted_ip
if got_ip is None:
LOG.warn("%s asked for un-offered %s", src, wanted_ip.toStr())
msg_type = dhcp.DHCP_NAK
wanted_opts = list()
if dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT in options:
fmt = "s" * len(options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
wanted_opt_set = struct.unpack(fmt, options[dhcp.DHCP_PARAMETER_REQUEST_LIST_OPT])
for i in wanted_opt_set:
wanted_opts.append(ord(i))
# DHCP options tag code
option_list = list()
option_list.append(dhcp.option(dhcp.DHCP_MESSAGE_TYPE_OPT, chr(msg_type), length=1))
if msg_type is not dhcp.DHCP_NAK:
if dhcp.DHCP_SUBNET_MASK_OPT in wanted_opts:
option_list.append(dhcp.option(dhcp.DHCP_SUBNET_MASK_OPT,
addrconv.ipv4.text_to_bin(self.subnet.toStr()),
length=4))
if dhcp.DHCP_GATEWAY_ADDR_OPT in wanted_opts and self.router_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_GATEWAY_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.router_addr.toStr()),
length=4))
if dhcp.DHCP_DNS_SERVER_ADDR_OPT in wanted_opts and self.dns_addr is not None:
option_list.append(dhcp.option(dhcp.DHCP_DNS_SERVER_ADDR_OPT,
addrconv.ipv4.text_to_bin(self.dns_addr.toStr()),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_IP_ADDR_LEASE_TIME_OPT,
chr(self.lease_time),
length=4))
option_list.append(dhcp.option(dhcp.DHCP_RENEWAL_TIME_OPT, chr(self.lease_time / 2), length=4))
option_list.append(dhcp.option(dhcp.DHCP_REBINDING_TIME_OPT, chr(self.lease_time * 7 / 8), length=4))
resp_options = dhcp.options(option_list=option_list)
pkt.add_protocol(dhcp.dhcp(op=self._MSG_TYPE_BOOT_REPLY, chaddr=pkt_dhcp.chaddr, options=resp_options,
xid=pkt_dhcp.xid, ciaddr=pkt_dhcp.ciaddr, yiaddr=wanted_ip.toStr(),
siaddr=self.ip_addr.toStr(), giaddr='0.0.0.0', sname='', boot_file=''))
# RELEASE MSG
if dhcp_msg_type == dhcp.DHCP_RELEASE:
if self.leases.get(src).toStr() != pkt_dhcp.ciaddr:
LOG.warn("%s tried to release unleased %s" % (src, pkt_dhcp.ciaddr))
return
del self.leases[src]
pool.append(pkt_dhcp.ciaddr)
LOG.info("%s released %s" % (src, pkt_dhcp.ciaddr))
self._send_dhcp_reply(datapath, port, pkt)
return True
