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pvc/router-daemon/pvcrd/DHCPServer.py

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Add DHCP server component based on python_dhcp_server
2018-09-30 01:30:39 -04:00
#!/usr/bin/python3
# DHCPServer.py - PVC router DHCP server with Zookeeper database
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
#
# Modified from python_dhcp_server
# Source: https://github.com/niccokunzmann/python_dhcp_server
#
# Copyright (c) 2015 Nicco Kunzmann and released under the MIT license
#
###############################################################################
import time
import threading
import struct
import queue
import collections
import traceback
import random
import base64
import select
import ipaddress
from socket import *
# see https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol
# section DHCP options
def inet_ntoaX(data):
return ['.'.join(map(str, data[i:i + 4])) for i in range(0, len(data), 4)]
def inet_atonX(ips):
return b''.join(map(inet_aton, ips))
dhcp_message_types = {
1 : 'DHCPDISCOVER',
2 : 'DHCPOFFER',
3 : 'DHCPREQUEST',
4 : 'DHCPDECLINE',
5 : 'DHCPACK',
6 : 'DHCPNAK',
7 : 'DHCPRELEASE',
8 : 'DHCPINFORM',
}
reversed_dhcp_message_types = dict()
for i, v in dhcp_message_types.items():
reversed_dhcp_message_types[v] = i
shortunpack = lambda data: (data[0] << 8) + data[1]
shortpack = lambda i: bytes([i >> 8, i & 255])
def macunpack(data):
s = base64.b16encode(data)
return ':'.join([s[i:i+2].decode('ascii') for i in range(0, 12, 2)])
def macpack(mac):
return base64.b16decode(mac.replace(':', '').replace('-', '').encode('ascii'))
def unpackbool(data):
return data[0]
def packbool(bool):
return bytes([bool])
options = [
# RFC1497 vendor extensions
('pad', None, None),
('subnet_mask', inet_ntoa, inet_aton),
('time_offset', None, None),
('router', inet_ntoaX, inet_atonX),
('time_server', inet_ntoaX, inet_atonX),
('name_server', inet_ntoaX, inet_atonX),
('domain_name_server', inet_ntoaX, inet_atonX),
('log_server', inet_ntoaX, inet_atonX),
('cookie_server', inet_ntoaX, inet_atonX),
('lpr_server', inet_ntoaX, inet_atonX),
('impress_server', inet_ntoaX, inet_atonX),
('resource_location_server', inet_ntoaX, inet_atonX),
('host_name', lambda d: d.decode('ASCII'), lambda d: d.encode('ASCII')),
('boot_file_size', None, None),
('merit_dump_file', None, None),
('domain_name', None, None),
('swap_server', inet_ntoa, inet_aton),
('root_path', None, None),
('extensions_path', None, None),
# IP Layer Parameters per Host
('ip_forwarding_enabled', unpackbool, packbool),
('non_local_source_routing_enabled', unpackbool, packbool),
('policy_filer', None, None),
('maximum_datagram_reassembly_size', shortunpack, shortpack),
('default_ip_time_to_live', lambda data: data[0], lambda i: bytes([i])),
('path_mtu_aging_timeout', None, None),
('path_mtu_plateau_table', None, None),
# IP Layer Parameters per Interface
('interface_mtu', None, None),
('all_subnets_are_local', unpackbool, packbool),
('broadcast_address', inet_ntoa, inet_aton),
('perform_mask_discovery', unpackbool, packbool),
('mask_supplier', None, None),
('perform_router_discovery', None, None),
('router_solicitation_address', inet_ntoa, inet_aton),
('static_route', None, None),
# Link Layer Parameters per Interface
('trailer_encapsulation_option', None, None),
('arp_cache_timeout', None, None),
('ethernet_encapsulation', None, None),
# TCP Parameters
('tcp_default_ttl', None, None),
('tcp_keep_alive_interval', None, None),
('tcp_keep_alive_garbage', None, None),
# Application and Service Parameters Part 1
('network_information_service_domain', None, None),
('network_informtaion_servers', inet_ntoaX, inet_atonX),
('network_time_protocol_servers', inet_ntoaX, inet_atonX),
('vendor_specific_information', None, None),
('netbios_over_tcp_ip_name_server', inet_ntoaX, inet_atonX),
('netbios_over_tcp_ip_datagram_distribution_server', inet_ntoaX, inet_atonX),
('netbios_over_tcp_ip_node_type', None, None),
('netbios_over_tcp_ip_scope', None, None),
('x_window_system_font_server', inet_ntoaX, inet_atonX),
('x_window_system_display_manager', inet_ntoaX, inet_atonX),
# DHCP Extensions
('requested_ip_address', inet_ntoa, inet_aton),
('ip_address_lease_time', lambda d: struct.unpack('>I', d)[0], lambda i: struct.pack('>I', i)),
('option_overload', None, None),
('dhcp_message_type', lambda data: dhcp_message_types.get(data[0], data[0]), (lambda name: bytes([reversed_dhcp_message_types.get(name, name)]))),
('server_identifier', inet_ntoa, inet_aton),
('parameter_request_list', list, bytes),
('message', None, None),
('maximum_dhcp_message_size', shortunpack, shortpack),
('renewal_time_value', None, None),
('rebinding_time_value', None, None),
('vendor_class_identifier', None, None),
('client_identifier', macunpack, macpack),
('tftp_server_name', None, None),
('boot_file_name', None, None),
# Application and Service Parameters Part 2
('network_information_service_domain', None, None),
('network_information_servers', inet_ntoaX, inet_atonX),
('', None, None),
('', None, None),
('mobile_ip_home_agent', inet_ntoaX, inet_atonX),
('smtp_server', inet_ntoaX, inet_atonX),
('pop_servers', inet_ntoaX, inet_atonX),
('nntp_server', inet_ntoaX, inet_atonX),
('default_www_server', inet_ntoaX, inet_atonX),
('default_finger_server', inet_ntoaX, inet_atonX),
('default_irc_server', inet_ntoaX, inet_atonX),
('streettalk_server', inet_ntoaX, inet_atonX),
('stda_server', inet_ntoaX, inet_atonX),
]
assert options[18][0] == 'extensions_path', options[18][0]
assert options[25][0] == 'path_mtu_plateau_table', options[25][0]
assert options[33][0] == 'static_route', options[33][0]
assert options[50][0] == 'requested_ip_address', options[50][0]
assert options[64][0] == 'network_information_service_domain', options[64][0]
assert options[76][0] == 'stda_server', options[76][0]
class ReadBootProtocolPacket(object):
for i, o in enumerate(options):
locals()[o[0]] = None
locals()['option_{0}'.format(i)] = None
del i, o
def __init__(self, data, address = ('0.0.0.0', 0)):
self.data = data
self.address = address
self.host = address[0]
self.port = address[1]
# wireshark = wikipedia = data[...]
self.message_type = self.OP = data[0]
self.hardware_type = self.HTYPE = data[1]
self.hardware_address_length = self.HLEN = data[2]
self.hops = self.HOPS = data[3]
self.XID = self.transaction_id = struct.unpack('>I', data[4:8])[0]
self.seconds_elapsed = self.SECS = shortunpack(data[8:10])
self.bootp_flags = self.FLAGS = shortunpack(data[8:10])
self.client_ip_address = self.CIADDR = inet_ntoa(data[12:16])
self.your_ip_address = self.YIADDR = inet_ntoa(data[16:20])
self.next_server_ip_address = self.SIADDR = inet_ntoa(data[20:24])
self.relay_agent_ip_address = self.GIADDR = inet_ntoa(data[24:28])
self.client_mac_address = self.CHADDR = macunpack(data[28: 28 + self.hardware_address_length])
index = 236
self.magic_cookie = self.magic_cookie = inet_ntoa(data[index:index + 4]); index += 4
self.options = dict()
self.named_options = dict()
while index < len(data):
option = data[index]; index += 1
if option == 0:
# padding
# Can be used to pad other options so that they are aligned to the word boundary; is not followed by length byte
continue
if option == 255:
# end
break
option_length = data[index]; index += 1
option_data = data[index: index + option_length]; index += option_length
self.options[option] = option_data
if option < len(options):
option_name, function, _ = options[option]
if function:
option_data = function(option_data)
if option_name:
setattr(self, option_name, option_data)
self.named_options[option_name] = option_data
setattr(self, 'option_{}'.format(option), option_data)
def __getitem__(self, key):
print(key, dir(self))
return getattr(self, key, None)
def __contains__(self, key):
return key in self.__dict__
@property
def formatted_named_options(self):
return "\n".join("{}:\t{}".format(name.replace('_', ' '), value) for name, value in sorted(self.named_options.items()))
def __str__(self):
return """Message Type: {self.message_type}
client MAC address: {self.client_mac_address}
client IP address: {self.client_ip_address}
your IP address: {self.your_ip_address}
next server IP address: {self.next_server_ip_address}
{self.formatted_named_options}
""".format(self = self)
def __gt__(self, other):
return id(self) < id(other)
data = base64.b16decode(b'02010600f7b41ad100000000c0a800640000000000000000000000007c7a914bca6c00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000638253633501053604c0a800010104ffffff000304c0a800010604c0a80001ff00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'.upper())
assert data[0] == 2
p = ReadBootProtocolPacket(data)
assert p.message_type == 2
assert p.hardware_type == 1
assert p.hardware_address_length == 6
assert p.hops == 0
assert p.transaction_id == 4155775697
assert p.seconds_elapsed == 0
assert p.bootp_flags == 0
assert p.client_ip_address == '192.168.0.100'
assert p.your_ip_address == '0.0.0.0'
assert p.next_server_ip_address == '0.0.0.0'
assert p.relay_agent_ip_address == '0.0.0.0'
assert p.client_mac_address.lower() == '7c:7a:91:4b:ca:6c'
assert p.magic_cookie == '99.130.83.99'
assert p.dhcp_message_type == 'DHCPACK'
assert p.options[53] == b'\x05'
assert p.server_identifier == '192.168.0.1'
assert p.subnet_mask == '255.255.255.0'
assert p.router == ['192.168.0.1']
assert p.domain_name_server == ['192.168.0.1']
str(p)
if __name__ == '__main__':
s1 = socket(type = SOCK_DGRAM)
s1.setsockopt(SOL_IP, SO_REUSEADDR, 1)
s1.bind(('', 67))
#s2 = socket(type = SOCK_DGRAM)
#s2.setsockopt(SOL_IP, SO_REUSEADDR, 1)
#s2.bind(('', 68))
while 1:
reads = select.select([s1], [], [], 1)[0]
for s in reads:
packet = ReadBootProtocolPacket(*s.recvfrom(4096))
print(packet)
def get_host_ip_addresses():
return gethostbyname_ex(gethostname())[2]
class WriteBootProtocolPacket(object):
message_type = 2 # 1 for client -> server 2 for server -> client
hardware_type = 1
hardware_address_length = 6
hops = 0
transaction_id = None
seconds_elapsed = 0
bootp_flags = 0 # unicast
client_ip_address = '0.0.0.0'
your_ip_address = '0.0.0.0'
next_server_ip_address = '0.0.0.0'
relay_agent_ip_address = '0.0.0.0'
client_mac_address = None
magic_cookie = '99.130.83.99'
parameter_order = []
def __init__(self, configuration):
for i in range(256):
names = ['option_{}'.format(i)]
if i < len(options) and hasattr(configuration, options[i][0]):
names.append(options[i][0])
for name in names:
if hasattr(configuration, name):
setattr(self, name, getattr(configuration, name))
def to_bytes(self):
result = bytearray(236)
result[0] = self.message_type
result[1] = self.hardware_type
result[2] = self.hardware_address_length
result[3] = self.hops
result[4:8] = struct.pack('>I', self.transaction_id)
result[ 8:10] = shortpack(self.seconds_elapsed)
result[10:12] = shortpack(self.bootp_flags)
result[12:16] = inet_aton(self.client_ip_address)
result[16:20] = inet_aton(self.your_ip_address)
result[20:24] = inet_aton(self.next_server_ip_address)
result[24:28] = inet_aton(self.relay_agent_ip_address)
result[28:28 + self.hardware_address_length] = macpack(self.client_mac_address)
result += inet_aton(self.magic_cookie)
for option in self.options:
value = self.get_option(option)
#print(option, value)
if value is None:
continue
result += bytes([option, len(value)]) + value
result += bytes([255])
return bytes(result)
def get_option(self, option):
if option < len(options) and hasattr(self, options[option][0]):
value = getattr(self, options[option][0])
elif hasattr(self, 'option_{}'.format(option)):
value = getattr(self, 'option_{}'.format(option))
else:
return None
function = options[option][2]
if function and value is not None:
value = function(value)
return value
@property
def options(self):
done = list()
# fulfill wishes
for option in self.parameter_order:
if option < len(options) and hasattr(self, options[option][0]) or hasattr(self, 'option_{}'.format(option)):
# this may break with the specification because we must try to fulfill the wishes
if option not in done:
done.append(option)
# add my stuff
for option, o in enumerate(options):
if o[0] and hasattr(self, o[0]):
if option not in done:
done.append(option)
for option in range(256):
if hasattr(self, 'option_{}'.format(option)):
if option not in done:
done.append(option)
return done
def __str__(self):
return str(ReadBootProtocolPacket(self.to_bytes()))
class DelayWorker(object):
def __init__(self):
self.closed = False
self.queue = queue.PriorityQueue()
self.thread = threading.Thread(target = self._delay_response_thread)
self.thread.daemon = True
self.thread.start()
def _delay_response_thread(self):
while not self.closed:
p = self.queue.get()
if self.closed:
break
t, func, args, kw = p
now = time.time()
if now < t:
time.sleep(0.01)
self.queue.put(p)
else:
func(*args, **kw)
def do_after(self, seconds, func, args = (), kw = {}):
self.queue.put((time.time() + seconds, func, args, kw))
def close(self):
self.closed = True
class Transaction(object):
def __init__(self, server):
self.server = server
self.configuration = server.configuration
self.packets = []
self.done_time = time.time() + self.configuration.length_of_transaction
self.done = False
self.do_after = self.server.delay_worker.do_after
def is_done(self):
return self.done or self.done_time < time.time()
def close(self):
self.done = True
def receive(self, packet):
# packet from client <-> packet.message_type == 1
if packet.message_type == 1 and packet.dhcp_message_type == 'DHCPDISCOVER':
self.do_after(self.configuration.dhcp_offer_after_seconds,
self.received_dhcp_discover, (packet,), )
elif packet.message_type == 1 and packet.dhcp_message_type == 'DHCPREQUEST':
self.do_after(self.configuration.dhcp_acknowledge_after_seconds,
self.received_dhcp_request, (packet,), )
elif packet.message_type == 1 and packet.dhcp_message_type == 'DHCPINFORM':
self.received_dhcp_inform(packet)
else:
return False
return True
def received_dhcp_discover(self, discovery):
if self.is_done(): return
self.configuration.debug('discover:\n {}'.format(str(discovery).replace('\n', '\n\t')))
self.send_offer(discovery)
def send_offer(self, discovery):
# https://tools.ietf.org/html/rfc2131
offer = WriteBootProtocolPacket(self.configuration)
offer.parameter_order = discovery.parameter_request_list
mac = discovery.client_mac_address
ip = offer.your_ip_address = self.server.get_ip_address(discovery)
# offer.client_ip_address =
offer.transaction_id = discovery.transaction_id
# offer.next_server_ip_address =
offer.relay_agent_ip_address = discovery.relay_agent_ip_address
offer.client_mac_address = mac
offer.client_ip_address = discovery.client_ip_address or '0.0.0.0'
offer.bootp_flags = discovery.bootp_flags
offer.dhcp_message_type = 'DHCPOFFER'
offer.client_identifier = mac
self.server.broadcast(offer)
def received_dhcp_request(self, request):
if self.is_done(): return
self.server.client_has_chosen(request)
self.acknowledge(request)
self.close()
def acknowledge(self, request):
ack = WriteBootProtocolPacket(self.configuration)
ack.parameter_order = request.parameter_request_list
ack.transaction_id = request.transaction_id
# ack.next_server_ip_address =
ack.bootp_flags = request.bootp_flags
ack.relay_agent_ip_address = request.relay_agent_ip_address
mac = request.client_mac_address
ack.client_mac_address = mac
requested_ip_address = request.requested_ip_address
ack.client_ip_address = request.client_ip_address or '0.0.0.0'
ack.your_ip_address = self.server.get_ip_address(request)
ack.dhcp_message_type = 'DHCPACK'
self.server.broadcast(ack)
def received_dhcp_inform(self, inform):
self.close()
self.server.client_has_chosen(inform)
class DHCPServerConfiguration(object):
def __init__(self, configuration):
self.dhcp_offer_after_seconds = 1
self.dhcp_acknowledge_after_seconds = 1
self.length_of_transaction = 60
print(configuration)
if not configuration:
print('ERROR: Invalid DHCP configuration!')
exit(1)
self.ipaddr = configuration['ipaddr']
self.iface = configuration['iface']
network_cidr = ipaddress.IPv4Network(configuration['network'], False)
self.network = network_cidr.network_address
self.broadcast_address = network_cidr.broadcast_address
self.subnet_mask = network_cidr.netmask
self.router = configuration['router']
self.domain_name_server = configuration['dns_servers']
# 1 day is 86400
self.ip_address_lease_time = 300 # seconds
self.host_file = 'hosts.csv'
self.debug = lambda *args, **kw: None
def all_ip_addresses(self):
ips = ip_addresses(self.network, self.subnet_mask)
for i in range(5):
next(ips)
return ips
def network_filter(self):
return NETWORK(self.network, self.subnet_mask)
def ip_addresses(network, subnet_mask):
subnet_mask = struct.unpack('>I', inet_aton(subnet_mask))[0]
network = struct.unpack('>I', inet_aton(network))[0]
network = network & subnet_mask
start = network + 1
end = (network | (~subnet_mask & 0xffffffff))
return (inet_ntoa(struct.pack('>I', i)) for i in range(start, end))
class ALL(object):
def __eq__(self, other):
return True
def __repr__(self):
return self.__class__.__name__
ALL = ALL()
class GREATER(object):
def __init__(self, value):
self.value = value
def __eq__(self, other):
return type(self.value)(other) > self.value
class NETWORK(object):
def __init__(self, network, subnet_mask):
self.subnet_mask = struct.unpack('>I', inet_aton(subnet_mask))[0]
print(self.subnet_mask)
self.network = struct.unpack('>I', inet_aton(network))[0]
def __eq__(self, other):
ip = struct.unpack('>I', inet_aton(other))[0]
return ip & self.subnet_mask == self.network and \
ip - self.network and \
ip - self.network != ~self.subnet_mask & 0xffffffff
class CASEINSENSITIVE(object):
def __init__(self, s):
self.s = s.lower()
def __eq__(self, other):
return self.s == other.lower()
class CSVDatabase(object):
delimiter = ';'
def __init__(self, file_name):
self.file_name = file_name
self.file('a').close() # create file
def file(self, mode = 'r'):
return open(self.file_name, mode)
def get(self, pattern):
pattern = list(pattern)
return [line for line in self.all() if pattern == line]
def add(self, line):
with self.file('a') as f:
f.write(self.delimiter.join(line) + '\n')
def delete(self, pattern):
lines = self.all()
lines_to_delete = self.get(pattern)
self.file('w').close() # empty file
for line in lines:
if line not in lines_to_delete:
self.add(line)
def all(self):
with self.file() as f:
return [list(line.strip().split(self.delimiter)) for line in f]
class Host(object):
def __init__(self, mac, ip, hostname, last_used):
self.mac = mac.upper()
self.ip = ip
self.hostname = hostname
self.last_used = int(last_used)
@classmethod
def from_tuple(cls, line):
mac, ip, hostname, last_used = line
last_used = int(last_used)
return cls(mac, ip, hostname, last_used)
@classmethod
def from_packet(cls, packet):
return cls(packet.client_mac_address,
packet.requested_ip_address or packet.client_ip_address,
packet.host_name or '',
int(time.time()))
@staticmethod
def get_pattern(mac = ALL, ip = ALL, hostname = ALL, last_used = ALL):
return [mac, ip, hostname, last_used]
def to_tuple(self):
return [self.mac, self.ip, self.hostname, str(int(self.last_used))]
def to_pattern(self):
return self.get_pattern(ip = self.ip, mac = self.mac)
def __hash__(self):
return hash(self.key)
def __eq__(self, other):
return self.to_tuple() == other.to_tuple()
def has_valid_ip(self):
return self.ip and self.ip != '0.0.0.0'
class HostDatabase(object):
def __init__(self, file_name):
self.db = CSVDatabase(file_name)
def get(self, **kw):
pattern = Host.get_pattern(**kw)
return list(map(Host.from_tuple, self.db.get(pattern)))
def add(self, host):
self.db.add(host.to_tuple())
def delete(self, host = None, **kw):
if host is None:
pattern = Host.get_pattern(**kw)
else:
pattern = host.to_pattern()
self.db.delete(pattern)
def all(self):
return list(map(Host.from_tuple, self.db.all()))
def replace(self, host):
self.delete(host)
self.add(host)
def sorted_hosts(hosts):
hosts = list(hosts)
hosts.sort(key = lambda host: (host.hostname.lower(), host.mac.lower(), host.ip.lower()))
return hosts
class DHCPServer(object):
def __init__(self, configuration):
self.configuration = configuration
self.socket = socket(type=SOCK_DGRAM)
self.socket.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
self.socket.setsockopt(SOL_SOCKET, 25, self.configuration.iface.encode('ascii'))
self.socket.bind(('<broadcast>', 67))
print(self.socket)
self.delay_worker = DelayWorker()
self.closed = False
self.transactions = collections.defaultdict(lambda: Transaction(self)) # id: transaction
self.hosts = HostDatabase(self.configuration.host_file)
self.time_started = time.time()
def close(self):
self.socket.close()
self.closed = True
self.delay_worker.close()
for transaction in list(self.transactions.values()):
transaction.close()
def update(self, timeout = 0):
try:
reads = select.select([self.socket], [], [], timeout)[0]
except ValueError:
# ValueError: file descriptor cannot be a negative integer (-1)
return
for socket in reads:
try:
packet = ReadBootProtocolPacket(*socket.recvfrom(4096))
except OSError:
# OSError: [WinError 10038] An operation was attempted on something that is not a socket
pass
else:
self.received(packet)
for transaction_id, transaction in list(self.transactions.items()):
if transaction.is_done():
transaction.close()
self.transactions.pop(transaction_id)
def received(self, packet):
if not self.transactions[packet.transaction_id].receive(packet):
self.configuration.debug('received:\n {}'.format(str(packet).replace('\n', '\n\t')))
def client_has_chosen(self, packet):
self.configuration.debug('client_has_chosen:\n {}'.format(str(packet).replace('\n', '\n\t')))
host = Host.from_packet(packet)
if not host.has_valid_ip():
return
self.hosts.replace(host)
def is_valid_client_address(self, address):
if address is None:
return False
a = address.split('.')
s = self.configuration.subnet_mask.split('.')
n = self.configuration.network.split('.')
return all(s[i] == '0' or a[i] == n[i] for i in range(4))
def get_ip_address(self, packet):
mac_address = packet.client_mac_address
requested_ip_address = packet.requested_ip_address
known_hosts = self.hosts.get(mac = CASEINSENSITIVE(mac_address))
ip = None
if known_hosts:
# 1. choose known ip address
for host in known_hosts:
if self.is_valid_client_address(host.ip):
ip = host.ip
print('known ip:', ip)
if ip is None and self.is_valid_client_address(requested_ip_address):
# 2. choose valid requested ip address
ip = requested_ip_address
print('valid ip:', ip)
if ip is None:
# 3. choose new, free ip address
chosen = False
network_hosts = self.hosts.get(ip = self.configuration.network_filter())
for ip in self.configuration.all_ip_addresses():
if not any(host.ip == ip for host in network_hosts):
chosen = True
break
if not chosen:
# 4. reuse old valid ip address
network_hosts.sort(key = lambda host: host.last_used)
ip = network_hosts[0].ip
assert self.is_valid_client_address(ip)
print('new ip:', ip)
if not any([host.ip == ip for host in known_hosts]):
print('add', mac_address, ip, packet.host_name)
self.hosts.replace(Host(mac_address, ip, packet.host_name or '', time.time()))
return ip
@property
def server_identifiers(self):
return get_host_ip_addresses()
def broadcast(self, packet):
self.configuration.debug('broadcasting:\n {}'.format(str(packet).replace('\n', '\n\t')))
for addr in self.server_identifiers:
broadcast_socket = socket(type = SOCK_DGRAM)
broadcast_socket.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
broadcast_socket.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
packet.server_identifier = addr
broadcast_socket.bind((self.configuration.ipaddr, 67))
try:
data = packet.to_bytes()
broadcast_socket.sendto(data, ('255.255.255.255', 68))
broadcast_socket.sendto(data, (addr, 68))
finally:
broadcast_socket.close()
def run(self):
while not self.closed:
try:
self.update(1)
except KeyboardInterrupt:
break
except:
traceback.print_exc()
def start(self):
self.thread = threading.Thread(target = self.run)
self.thread.daemon = True
self.thread.start()
def debug_clients(self):
for line in self.ips.all():
line = '\t'.join(line)
if line:
self.configuration.debug(line)
def get_all_hosts(self):
return sorted_hosts(self.hosts.get())
def get_current_hosts(self):
return sorted_hosts(self.hosts.get(last_used = GREATER(self.time_started)))