def main():
s = Server()
s.server_name = 'example server'
s.on_packet = print_packet
s.on_request = request
s.start(sys.argv[1])
s.serve()
def run():
""" Run dhcp """
SETTINGS.parse()
backend = get_backend(SETTINGS.backend)
server = Server(backend=backend(),
interface=SETTINGS.interface,
authoritative=SETTINGS.authoritative,
server_ident=SETTINGS.server_ident)
logger.info("Starting DHCP server")
while True:
try:
server.serve()
except KeyboardInterrupt:
break
except Exception as ex:
logger.error("Error running DHCP server: %s",
str(ex),
exc_info=True)
logger.info("DHCP server stopped")
class ManagementNetwork(object):
def __init__(self, context, ifname, subnet):
self.context = context
self.ifname = ifname
self.subnet = subnet
self.bridge_if = None
self.dhcp_server_thread = None
self.dhcp_server = Server()
self.allocations = {}
self.logger = logging.getLogger('ManagementNetwork:{0}'.format(self.ifname))
def up(self):
# Destroy old bridge (if exists)
try:
netif.destroy_interface(self.ifname)
except OSError as err:
if err.errno != errno.ENXIO:
raise RuntimeError('Cannot destroy {0}: {1}'.format(self.ifname, str(err)))
# Setup bridge
self.bridge_if = netif.get_interface(netif.create_interface('bridge'))
self.bridge_if.rename(self.ifname)
self.bridge_if.description = 'containerd management network'
self.bridge_if.add_address(netif.InterfaceAddress(
netif.AddressFamily.INET,
self.subnet
))
self.bridge_if.up()
self.dhcp_server.server_name = 'FreeNAS'
self.dhcp_server.on_request = self.dhcp_request
self.dhcp_server.start(self.ifname, self.subnet.ip)
self.dhcp_server_thread = gevent.spawn(self.dhcp_worker)
def down(self):
self.bridge_if.down()
netif.destroy_interface(self.ifname)
def dhcp_worker(self):
make_nonblocking(self.dhcp_server.bpf.fd)
self.dhcp_server.serve()
def allocation_by_ip(self, ip):
for allocation in self.allocations.values():
if allocation.lease.client_ip == ip:
return allocation
return None
def pick_ip_address(self):
for i in self.subnet.network.hosts():
if i == self.subnet.ip:
continue
if not self.allocation_by_ip(i):
return i
return None
def allocate_ip_address(self, mac, hostname):
allocation = self.allocations.get(mac)
if not allocation or not allocation.vm():
self.logger.debug('Trying to match MAC address {0} and hostname {1} to a container'.format(
mac,
hostname
))
vm = self.context.vm_by_mgmt_mac(mac)
if not vm:
self.logger.warning('Cannot find a match for MAC {0}'.format(mac))
return None
allocation = AddressAllocation()
allocation.vm = weakref.ref(vm)
allocation.hostname = hostname
allocation.lease = Lease()
allocation.lease.client_mac = mac
allocation.lease.client_ip = self.pick_ip_address()
allocation.lease.client_mask = self.subnet.netmask
allocation.lease.router = self.subnet.ip
allocation.lease.dns_addresses = [ipaddress.ip_address('8.8.8.8'), ipaddress.ip_address('8.8.4.4')]
self.allocations[mac] = allocation
vm.changed()
return allocation
def dhcp_request(self, mac, hostname):
self.logger.info('DHCP request from {0} ({1})'.format(mac, hostname))
allocation = self.allocate_ip_address(mac, hostname)
if not allocation:
self.logger.warning('Unknown MAC address {0}'.format(mac))
return None
self.logger.info('Allocating IP address {0} to VM {1}'.format(allocation.lease.client_ip, allocation.vm().name))
return allocation.lease
def dhcp_release(self, lease):
pass