882 lines
32 KiB
Python
882 lines
32 KiB
Python
#!/usr/bin/python3
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# DHCPServer.py - PVC router DHCP server with Zookeeper database
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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#
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# Modified from python_dhcp_server
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# Source: https://github.com/niccokunzmann/python_dhcp_server
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#
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# Copyright (c) 2015 Nicco Kunzmann and released under the MIT license
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#
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###############################################################################
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import time
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import threading
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import struct
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import queue
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import collections
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import traceback
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import random
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import base64
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import select
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import ipaddress
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from socket import *
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import daemon_lib.zkhandler as zkhandler
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# see https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol
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# section DHCP options
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def inet_ntoaX(data):
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return ['.'.join(map(str, data[i:i + 4])) for i in range(0, len(data), 4)]
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def inet_atonX(ips):
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return b''.join(map(inet_aton, ips))
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dhcp_message_types = {
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1 : 'DHCPDISCOVER',
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2 : 'DHCPOFFER',
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3 : 'DHCPREQUEST',
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4 : 'DHCPDECLINE',
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5 : 'DHCPACK',
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6 : 'DHCPNAK',
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7 : 'DHCPRELEASE',
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8 : 'DHCPINFORM',
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}
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reversed_dhcp_message_types = dict()
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for i, v in dhcp_message_types.items():
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reversed_dhcp_message_types[v] = i
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shortunpack = lambda data: (data[0] << 8) + data[1]
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shortpack = lambda i: bytes([i >> 8, i & 255])
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def macunpack(data):
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s = base64.b16encode(data)
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return ':'.join([s[i:i+2].decode('ascii') for i in range(0, 12, 2)])
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def macpack(mac):
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return base64.b16decode(mac.replace(':', '').replace('-', '').encode('ascii'))
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def unpackbool(data):
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return data[0]
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def packbool(bool):
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return bytes([bool])
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options = [
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# RFC1497 vendor extensions
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('pad', None, None),
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('subnet_mask', inet_ntoa, inet_aton),
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('time_offset', None, None),
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('router', inet_ntoaX, inet_atonX),
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('time_server', inet_ntoaX, inet_atonX),
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('name_server', inet_ntoaX, inet_atonX),
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('domain_name_server', inet_ntoaX, inet_atonX),
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('log_server', inet_ntoaX, inet_atonX),
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('cookie_server', inet_ntoaX, inet_atonX),
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('lpr_server', inet_ntoaX, inet_atonX),
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('impress_server', inet_ntoaX, inet_atonX),
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('resource_location_server', inet_ntoaX, inet_atonX),
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('host_name', lambda d: d.decode('ASCII'), lambda d: d.encode('ASCII')),
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('boot_file_size', None, None),
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('merit_dump_file', None, None),
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('domain_name', None, None),
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('swap_server', inet_ntoa, inet_aton),
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('root_path', None, None),
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('extensions_path', None, None),
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# IP Layer Parameters per Host
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('ip_forwarding_enabled', unpackbool, packbool),
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('non_local_source_routing_enabled', unpackbool, packbool),
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('policy_filer', None, None),
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('maximum_datagram_reassembly_size', shortunpack, shortpack),
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('default_ip_time_to_live', lambda data: data[0], lambda i: bytes([i])),
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('path_mtu_aging_timeout', None, None),
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('path_mtu_plateau_table', None, None),
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# IP Layer Parameters per Interface
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('interface_mtu', None, None),
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('all_subnets_are_local', unpackbool, packbool),
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('broadcast_address', inet_ntoa, inet_aton),
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('perform_mask_discovery', unpackbool, packbool),
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('mask_supplier', None, None),
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('perform_router_discovery', None, None),
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('router_solicitation_address', inet_ntoa, inet_aton),
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('static_route', None, None),
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# Link Layer Parameters per Interface
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('trailer_encapsulation_option', None, None),
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('arp_cache_timeout', None, None),
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('ethernet_encapsulation', None, None),
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# TCP Parameters
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('tcp_default_ttl', None, None),
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('tcp_keep_alive_interval', None, None),
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('tcp_keep_alive_garbage', None, None),
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# Application and Service Parameters Part 1
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('network_information_service_domain', None, None),
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('network_informtaion_servers', inet_ntoaX, inet_atonX),
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('network_time_protocol_servers', inet_ntoaX, inet_atonX),
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('vendor_specific_information', None, None),
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('netbios_over_tcp_ip_name_server', inet_ntoaX, inet_atonX),
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('netbios_over_tcp_ip_datagram_distribution_server', inet_ntoaX, inet_atonX),
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('netbios_over_tcp_ip_node_type', None, None),
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('netbios_over_tcp_ip_scope', None, None),
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('x_window_system_font_server', inet_ntoaX, inet_atonX),
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('x_window_system_display_manager', inet_ntoaX, inet_atonX),
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# DHCP Extensions
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('requested_ip_address', inet_ntoa, inet_aton),
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('ip_address_lease_time', lambda d: struct.unpack('>I', d)[0], lambda i: struct.pack('>I', i)),
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('option_overload', None, None),
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('dhcp_message_type', lambda data: dhcp_message_types.get(data[0], data[0]), (lambda name: bytes([reversed_dhcp_message_types.get(name, name)]))),
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('server_identifier', inet_ntoa, inet_aton),
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('parameter_request_list', list, bytes),
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('message', None, None),
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('maximum_dhcp_message_size', shortunpack, shortpack),
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('renewal_time_value', None, None),
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('rebinding_time_value', None, None),
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('vendor_class_identifier', None, None),
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('client_identifier', macunpack, macpack),
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('tftp_server_name', None, None),
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('boot_file_name', None, None),
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# Application and Service Parameters Part 2
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('network_information_service_domain', None, None),
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('network_information_servers', inet_ntoaX, inet_atonX),
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('', None, None),
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('', None, None),
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('mobile_ip_home_agent', inet_ntoaX, inet_atonX),
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('smtp_server', inet_ntoaX, inet_atonX),
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('pop_servers', inet_ntoaX, inet_atonX),
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('nntp_server', inet_ntoaX, inet_atonX),
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('default_www_server', inet_ntoaX, inet_atonX),
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('default_finger_server', inet_ntoaX, inet_atonX),
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('default_irc_server', inet_ntoaX, inet_atonX),
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('streettalk_server', inet_ntoaX, inet_atonX),
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('stda_server', inet_ntoaX, inet_atonX),
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]
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assert options[18][0] == 'extensions_path', options[18][0]
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assert options[25][0] == 'path_mtu_plateau_table', options[25][0]
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assert options[33][0] == 'static_route', options[33][0]
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assert options[50][0] == 'requested_ip_address', options[50][0]
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assert options[64][0] == 'network_information_service_domain', options[64][0]
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assert options[76][0] == 'stda_server', options[76][0]
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class ReadBootProtocolPacket(object):
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for i, o in enumerate(options):
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locals()[o[0]] = None
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locals()['option_{0}'.format(i)] = None
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del i, o
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def __init__(self, data, address = ('0.0.0.0', 0)):
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self.data = data
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self.address = address
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self.host = address[0]
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self.port = address[1]
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# wireshark = wikipedia = data[...]
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self.message_type = self.OP = data[0]
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self.hardware_type = self.HTYPE = data[1]
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self.hardware_address_length = self.HLEN = data[2]
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self.hops = self.HOPS = data[3]
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self.XID = self.transaction_id = struct.unpack('>I', data[4:8])[0]
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self.seconds_elapsed = self.SECS = shortunpack(data[8:10])
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self.bootp_flags = self.FLAGS = shortunpack(data[8:10])
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self.client_ip_address = self.CIADDR = inet_ntoa(data[12:16])
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self.your_ip_address = self.YIADDR = inet_ntoa(data[16:20])
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self.next_server_ip_address = self.SIADDR = inet_ntoa(data[20:24])
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self.relay_agent_ip_address = self.GIADDR = inet_ntoa(data[24:28])
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self.client_mac_address = self.CHADDR = macunpack(data[28: 28 + self.hardware_address_length])
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index = 236
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self.magic_cookie = self.magic_cookie = inet_ntoa(data[index:index + 4]); index += 4
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self.options = dict()
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self.named_options = dict()
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while index < len(data):
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option = data[index]; index += 1
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if option == 0:
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# padding
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# Can be used to pad other options so that they are aligned to the word boundary; is not followed by length byte
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continue
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if option == 255:
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# end
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break
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option_length = data[index]; index += 1
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option_data = data[index: index + option_length]; index += option_length
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self.options[option] = option_data
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if option < len(options):
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option_name, function, _ = options[option]
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if function:
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option_data = function(option_data)
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if option_name:
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setattr(self, option_name, option_data)
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self.named_options[option_name] = option_data
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setattr(self, 'option_{}'.format(option), option_data)
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def __getitem__(self, key):
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print(key, dir(self))
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return getattr(self, key, None)
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def __contains__(self, key):
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return key in self.__dict__
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@property
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def formatted_named_options(self):
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return "\n".join("{}:\t{}".format(name.replace('_', ' '), value) for name, value in sorted(self.named_options.items()))
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def __str__(self):
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return """Message Type: {self.message_type}
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client MAC address: {self.client_mac_address}
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client IP address: {self.client_ip_address}
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your IP address: {self.your_ip_address}
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next server IP address: {self.next_server_ip_address}
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{self.formatted_named_options}
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""".format(self = self)
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def __gt__(self, other):
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return id(self) < id(other)
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data = base64.b16decode(b'02010600f7b41ad100000000c0a800640000000000000000000000007c7a914bca6c00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000638253633501053604c0a800010104ffffff000304c0a800010604c0a80001ff00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'.upper())
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assert data[0] == 2
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p = ReadBootProtocolPacket(data)
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assert p.message_type == 2
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assert p.hardware_type == 1
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assert p.hardware_address_length == 6
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assert p.hops == 0
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assert p.transaction_id == 4155775697
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assert p.seconds_elapsed == 0
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assert p.bootp_flags == 0
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assert p.client_ip_address == '192.168.0.100'
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assert p.your_ip_address == '0.0.0.0'
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assert p.next_server_ip_address == '0.0.0.0'
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assert p.relay_agent_ip_address == '0.0.0.0'
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assert p.client_mac_address.lower() == '7c:7a:91:4b:ca:6c'
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assert p.magic_cookie == '99.130.83.99'
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assert p.dhcp_message_type == 'DHCPACK'
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assert p.options[53] == b'\x05'
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assert p.server_identifier == '192.168.0.1'
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assert p.subnet_mask == '255.255.255.0'
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assert p.router == ['192.168.0.1']
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assert p.domain_name_server == ['192.168.0.1']
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str(p)
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if __name__ == '__main__':
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s1 = socket(type = SOCK_DGRAM)
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s1.setsockopt(SOL_IP, SO_REUSEADDR, 1)
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s1.bind(('', 67))
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#s2 = socket(type = SOCK_DGRAM)
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#s2.setsockopt(SOL_IP, SO_REUSEADDR, 1)
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#s2.bind(('', 68))
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while 1:
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reads = select.select([s1], [], [], 1)[0]
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for s in reads:
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packet = ReadBootProtocolPacket(*s.recvfrom(4096))
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print(packet)
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def get_host_ip_addresses():
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return gethostbyname_ex(gethostname())[2]
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class WriteBootProtocolPacket(object):
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message_type = 2 # 1 for client -> server 2 for server -> client
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hardware_type = 1
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hardware_address_length = 6
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hops = 0
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transaction_id = None
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seconds_elapsed = 0
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bootp_flags = 0 # unicast
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client_ip_address = '0.0.0.0'
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your_ip_address = '0.0.0.0'
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next_server_ip_address = '0.0.0.0'
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relay_agent_ip_address = '0.0.0.0'
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client_mac_address = None
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magic_cookie = '99.130.83.99'
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parameter_order = []
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def __init__(self, configuration):
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for i in range(256):
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names = ['option_{}'.format(i)]
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if i < len(options) and hasattr(configuration, options[i][0]):
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names.append(options[i][0])
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for name in names:
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if hasattr(configuration, name):
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setattr(self, name, getattr(configuration, name))
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def to_bytes(self):
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result = bytearray(236)
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result[0] = self.message_type
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result[1] = self.hardware_type
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result[2] = self.hardware_address_length
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result[3] = self.hops
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result[4:8] = struct.pack('>I', self.transaction_id)
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result[ 8:10] = shortpack(self.seconds_elapsed)
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result[10:12] = shortpack(self.bootp_flags)
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result[12:16] = inet_aton(self.client_ip_address)
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result[16:20] = inet_aton(self.your_ip_address)
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result[20:24] = inet_aton(self.next_server_ip_address)
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result[24:28] = inet_aton(self.relay_agent_ip_address)
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result[28:28 + self.hardware_address_length] = macpack(self.client_mac_address)
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result += inet_aton(self.magic_cookie)
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for option in self.options:
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value = self.get_option(option)
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#print(option, value)
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if value is None:
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continue
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result += bytes([option, len(value)]) + value
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result += bytes([255])
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return bytes(result)
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def get_option(self, option):
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if option < len(options) and hasattr(self, options[option][0]):
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value = getattr(self, options[option][0])
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elif hasattr(self, 'option_{}'.format(option)):
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value = getattr(self, 'option_{}'.format(option))
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else:
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return None
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function = options[option][2]
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if function and value is not None:
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value = function(value)
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return value
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@property
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def options(self):
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done = list()
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# fulfill wishes
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for option in self.parameter_order:
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if option < len(options) and hasattr(self, options[option][0]) or hasattr(self, 'option_{}'.format(option)):
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# this may break with the specification because we must try to fulfill the wishes
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if option not in done:
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done.append(option)
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# add my stuff
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for option, o in enumerate(options):
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if o[0] and hasattr(self, o[0]):
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if option not in done:
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done.append(option)
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for option in range(256):
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if hasattr(self, 'option_{}'.format(option)):
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if option not in done:
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done.append(option)
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return done
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def __str__(self):
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return str(ReadBootProtocolPacket(self.to_bytes()))
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class DelayWorker(object):
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def __init__(self):
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self.closed = False
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self.queue = queue.PriorityQueue()
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self.thread = threading.Thread(target = self._delay_response_thread)
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self.thread.daemon = True
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self.thread.start()
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def _delay_response_thread(self):
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while not self.closed:
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p = self.queue.get()
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if self.closed:
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break
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t, func, args, kw = p
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now = time.time()
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if now < t:
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time.sleep(0.01)
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self.queue.put(p)
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else:
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func(*args, **kw)
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def do_after(self, seconds, func, args = (), kw = {}):
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self.queue.put((time.time() + seconds, func, args, kw))
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def close(self):
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self.closed = True
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class Transaction(object):
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def __init__(self, server):
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self.server = server
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self.configuration = server.configuration
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self.packets = []
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self.done_time = time.time() + self.configuration.length_of_transaction
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self.done = False
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self.do_after = self.server.delay_worker.do_after
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def is_done(self):
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return self.done or self.done_time < time.time()
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def close(self):
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self.done = True
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def receive(self, packet):
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# packet from client <-> packet.message_type == 1
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if packet.message_type == 1 and packet.dhcp_message_type == 'DHCPDISCOVER':
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self.do_after(self.configuration.dhcp_offer_after_seconds,
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self.received_dhcp_discover, (packet,), )
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elif packet.message_type == 1 and packet.dhcp_message_type == 'DHCPREQUEST':
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self.do_after(self.configuration.dhcp_acknowledge_after_seconds,
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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, zk_conn, ipaddr, iface, vni, network, router, dns_servers):
|
|
self.dhcp_offer_after_seconds = 1
|
|
self.dhcp_acknowledge_after_seconds = 1
|
|
self.length_of_transaction = 60
|
|
|
|
self.zk_conn = zk_conn
|
|
|
|
self.ipaddr = ipaddr
|
|
self.iface = iface
|
|
self.vni = vni
|
|
|
|
network_cidr = ipaddress.IPv4Network(network, False)
|
|
self.network = str(network_cidr.network_address)
|
|
self.broadcast_address = str(network_cidr.broadcast_address)
|
|
self.subnet_mask = str(network_cidr.netmask)
|
|
|
|
self.router = router
|
|
self.domain_name_server = 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]
|
|
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 ZKDatabase(object):
|
|
|
|
# Store DHCP leases in zookeeper
|
|
# /networks/<VNI>/dhcp_leases/<MAC>:<timestamp>/{ipaddr,hostname}
|
|
# Line:
|
|
# ['52:54:00:21:34:11', '10.10.10.6', 'test1', '1538287572']
|
|
|
|
def __init__(self, zk_conn, key):
|
|
self.zk_conn = zk_conn
|
|
self.key = key
|
|
|
|
def get(self, pattern):
|
|
pattern = list(pattern)
|
|
return [line for line in self.all() if pattern[0] == line[0] or pattern[1] == line[1] or pattern[2] == line[2]]
|
|
|
|
def isstatic(self, pattern):
|
|
macaddr = pattern[0]
|
|
try:
|
|
timestamp = zkhandler.readdata(self.zk_conn, '{}/{}'.format(self.key, macaddr))
|
|
if timestamp == 'static':
|
|
return True
|
|
else:
|
|
return False
|
|
except Exception:
|
|
return False
|
|
|
|
def add(self, line):
|
|
macaddr = line[0]
|
|
ipaddr = line[1]
|
|
hostname = line[2]
|
|
timestamp = line[3]
|
|
|
|
zkhandler.writedata(self.zk_conn, {
|
|
'{}/{}'.format(self.key, macaddr): timestamp,
|
|
'{}/{}/ipaddr'.format(self.key, macaddr): ipaddr,
|
|
'{}/{}/hostname'.format(self.key, macaddr): hostname
|
|
})
|
|
|
|
def delete(self, pattern):
|
|
macaddr = pattern[0]
|
|
try:
|
|
zkhandler.delete(self.zk_conn, '{}/{}'.format(self.key, macaddr))
|
|
except Exception:
|
|
pass
|
|
|
|
def all(self):
|
|
leases = []
|
|
mac_list = zkhandler.listchildren(self.zk_conn, self.key)
|
|
for macaddr in mac_list:
|
|
timestamp = zkhandler.readdata(self.zk_conn, '{}/{}'.format(self.key, macaddr))
|
|
if timestamp == 'static':
|
|
timestamp = 0
|
|
ipaddr = zkhandler.readdata(self.zk_conn, '{}/{}/ipaddr'.format(self.key, macaddr))
|
|
hostname = zkhandler.readdata(self.zk_conn, '{}/{}/hostname'.format(self.key, macaddr))
|
|
leases.append([macaddr, ipaddr, hostname, timestamp])
|
|
return leases
|
|
|
|
|
|
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, zk_conn, vni):
|
|
self.db = ZKDatabase(zk_conn, '/networks/{}/dhcp_leases'.format(vni))
|
|
|
|
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 isstatic(self, host):
|
|
return self.db.isstatic(host.to_tuple())
|
|
|
|
def all(self):
|
|
return list(map(Host.from_tuple, self.db.all()))
|
|
|
|
def replace(self, host):
|
|
if not self.isstatic(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))
|
|
self.delay_worker = DelayWorker()
|
|
self.closed = False
|
|
self.transactions = collections.defaultdict(lambda: Transaction(self)) # id: transaction
|
|
self.hosts = HostDatabase(self.configuration.zk_conn, self.configuration.vni)
|
|
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 as e:
|
|
# ValueError: file descriptor cannot be a negative integer (-1)
|
|
print(e)
|
|
return
|
|
for socket in reads:
|
|
try:
|
|
packet = ReadBootProtocolPacket(*socket.recvfrom(4096))
|
|
except OSError as e:
|
|
# OSError: [WinError 10038] An operation was attempted on something that is not a socket
|
|
print(e)
|
|
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 (including static lease)
|
|
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)))
|