summaryrefslogtreecommitdiff
path: root/python/vyos/kea.py
diff options
context:
space:
mode:
Diffstat (limited to 'python/vyos/kea.py')
-rw-r--r--python/vyos/kea.py310
1 files changed, 310 insertions, 0 deletions
diff --git a/python/vyos/kea.py b/python/vyos/kea.py
new file mode 100644
index 000000000..0ee6871e7
--- /dev/null
+++ b/python/vyos/kea.py
@@ -0,0 +1,310 @@
+# Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library. If not, see <http://www.gnu.org/licenses/>.
+
+import json
+import os
+import socket
+
+from datetime import datetime
+
+from vyos.template import is_ipv6
+from vyos.template import isc_static_route
+from vyos.template import netmask_from_cidr
+from vyos.utils.dict import dict_search_args
+from vyos.utils.file import read_file
+
+kea4_options = {
+ 'name_server': 'domain-name-servers',
+ 'domain_name': 'domain-name',
+ 'domain_search': 'domain-search',
+ 'ntp_server': 'ntp-servers',
+ 'pop_server': 'pop-server',
+ 'smtp_server': 'smtp-server',
+ 'time_server': 'time-servers',
+ 'wins_server': 'netbios-name-servers',
+ 'default_router': 'routers',
+ 'server_identifier': 'dhcp-server-identifier',
+ 'tftp_server_name': 'tftp-server-name',
+ 'bootfile_size': 'boot-size',
+ 'time_offset': 'time-offset',
+ 'wpad_url': 'wpad-url',
+ 'ipv6_only_preferred': 'v6-only-preferred'
+}
+
+kea6_options = {
+ 'info_refresh_time': 'information-refresh-time',
+ 'name_server': 'dns-servers',
+ 'domain_search': 'domain-search',
+ 'nis_domain': 'nis-domain-name',
+ 'nis_server': 'nis-servers',
+ 'nisplus_domain': 'nisp-domain-name',
+ 'nisplus_server': 'nisp-servers',
+ 'sntp_server': 'sntp-servers'
+}
+
+def kea_parse_options(config):
+ options = []
+
+ for node, option_name in kea4_options.items():
+ if node not in config:
+ continue
+
+ value = ", ".join(config[node]) if isinstance(config[node], list) else config[node]
+ options.append({'name': option_name, 'data': value})
+
+ if 'client_prefix_length' in config:
+ options.append({'name': 'subnet-mask', 'data': netmask_from_cidr('0.0.0.0/' + config['client_prefix_length'])})
+
+ if 'ip_forwarding' in config:
+ options.append({'name': 'ip-forwarding', 'data': "true"})
+
+ if 'static_route' in config:
+ default_route = ''
+
+ if 'default_router' in config:
+ default_route = isc_static_route('0.0.0.0/0', config['default_router'])
+
+ routes = [isc_static_route(route, route_options['next_hop']) for route, route_options in config['static_route'].items()]
+
+ options.append({'name': 'rfc3442-static-route', 'data': ", ".join(routes if not default_route else routes + [default_route])})
+ options.append({'name': 'windows-static-route', 'data': ", ".join(routes)})
+
+ return options
+
+def kea_parse_subnet(subnet, config):
+ out = {'subnet': subnet}
+ options = kea_parse_options(config)
+
+ if 'bootfile_name' in config:
+ out['boot-file-name'] = config['bootfile_name']
+
+ if 'bootfile_server' in config:
+ out['next-server'] = config['bootfile_server']
+
+ if 'lease' in config:
+ out['valid-lifetime'] = int(config['lease'])
+ out['max-valid-lifetime'] = int(config['lease'])
+
+ if 'range' in config:
+ pools = []
+ for num, range_config in config['range'].items():
+ start, stop = range_config['start'], range_config['stop']
+ pools.append({'pool': f'{start} - {stop}'})
+ out['pools'] = pools
+
+ if 'static_mapping' in config:
+ reservations = []
+ for host, host_config in config['static_mapping'].items():
+ if 'disable' in host_config:
+ continue
+
+ reservations.append({
+ 'hw-address': host_config['mac_address'],
+ 'ip-address': host_config['ip_address']
+ })
+ out['reservations'] = reservations
+
+ unifi_controller = dict_search_args(config, 'vendor_option', 'ubiquiti', 'unifi_controller')
+ if unifi_controller:
+ options.append({
+ 'name': 'unifi-controller',
+ 'data': unifi_controller,
+ 'space': 'ubnt'
+ })
+
+ if options:
+ out['option-data'] = options
+
+ return out
+
+def kea6_parse_options(config):
+ options = []
+
+ if 'common_options' in config:
+ common_opt = config['common_options']
+
+ for node, option_name in kea6_options.items():
+ if node not in common_opt:
+ continue
+
+ value = ", ".join(common_opt[node]) if isinstance(common_opt[node], list) else common_opt[node]
+ options.append({'name': option_name, 'data': value})
+
+ for node, option_name in kea6_options.items():
+ if node not in config:
+ continue
+
+ value = ", ".join(config[node]) if isinstance(config[node], list) else config[node]
+ options.append({'name': option_name, 'data': value})
+
+ if 'sip_server' in config:
+ sip_servers = config['sip_server']
+
+ addrs = []
+ hosts = []
+
+ for server in sip_servers:
+ if is_ipv6(server):
+ addrs.append(server)
+ else:
+ hosts.append(server)
+
+ if addrs:
+ options.append({'name': 'sip-server-addr', 'data': ", ".join(addrs)})
+
+ if hosts:
+ options.append({'name': 'sip-server-dns', 'data': ", ".join(hosts)})
+
+ cisco_tftp = dict_search_args(config, 'vendor_option', 'cisco', 'tftp-server')
+ if cisco_tftp:
+ options.append({'name': 'tftp-servers', 'code': 2, 'space': 'cisco', 'data': cisco_tftp})
+
+ return options
+
+def kea6_parse_subnet(subnet, config):
+ out = {'subnet': subnet}
+ options = kea6_parse_options(config)
+
+ if 'address_range' in config:
+ addr_range = config['address_range']
+ pools = []
+
+ if 'prefix' in addr_range:
+ for prefix in addr_range['prefix']:
+ pools.append({'pool': prefix})
+
+ if 'start' in addr_range:
+ for start, range_conf in addr_range['start'].items():
+ stop = range_conf['stop']
+ pools.append({'pool': f'{start} - {stop}'})
+
+ out['pools'] = pools
+
+ if 'prefix_delegation' in config:
+ pd_pools = []
+
+ if 'prefix' in config['prefix_delegation']:
+ for prefix, pd_conf in config['prefix_delegation']['prefix'].items():
+ pd_pools.append({
+ 'prefix': prefix,
+ 'prefix-len': int(pd_conf['prefix_length']),
+ 'delegated-len': int(pd_conf['delegated_length'])
+ })
+
+ out['pd-pools'] = pd_pools
+
+ if 'lease_time' in config:
+ if 'default' in config['lease_time']:
+ out['valid-lifetime'] = int(config['lease_time']['default'])
+ if 'maximum' in config['lease_time']:
+ out['max-valid-lifetime'] = int(config['lease_time']['maximum'])
+ if 'minimum' in config['lease_time']:
+ out['min-valid-lifetime'] = int(config['lease_time']['minimum'])
+
+ if 'static_mapping' in config:
+ reservations = []
+ for host, host_config in config['static_mapping'].items():
+ if 'disable' in host_config:
+ continue
+
+ reservation = {}
+
+ if 'identifier' in host_config:
+ reservation['duid'] = host_config['identifier']
+
+ if 'ipv6_address' in host_config:
+ reservation['ip-addresses'] = [ host_config['ipv6_address'] ]
+
+ if 'ipv6_prefix' in host_config:
+ reservation['prefixes'] = [ host_config['ipv6_prefix'] ]
+
+ reservations.append(reservation)
+
+ out['reservations'] = reservations
+
+ if options:
+ out['option-data'] = options
+
+ return out
+
+def kea_parse_leases(lease_path):
+ contents = read_file(lease_path)
+ lines = contents.split("\n")
+ output = []
+
+ if len(lines) < 2:
+ return output
+
+ headers = lines[0].split(",")
+
+ for line in lines[1:]:
+ line_out = dict(zip(headers, line.split(",")))
+
+ lifetime = int(line_out['valid_lifetime'])
+ expiry = int(line_out['expire'])
+
+ line_out['start_timestamp'] = datetime.utcfromtimestamp(expiry - lifetime)
+ line_out['expire_timestamp'] = datetime.utcfromtimestamp(expiry) if expiry else None
+
+ output.append(line_out)
+
+ return output
+
+def _ctrl_socket_command(path, command, args=None):
+ if not os.path.exists(path):
+ return None
+
+ with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as sock:
+ sock.connect(path)
+
+ payload = {'command': command}
+ if args:
+ payload['arguments'] = args
+
+ sock.send(bytes(json.dumps(payload), 'utf-8'))
+ result = b''
+ while True:
+ data = sock.recv(4096)
+ result += data
+ if len(data) < 4096:
+ break
+
+ return json.loads(result.decode('utf-8'))
+
+def kea_get_active_config(inet):
+ ctrl_socket = f'/run/kea/dhcp{inet}-ctrl-socket'
+
+ config = _ctrl_socket_command(ctrl_socket, 'config-get')
+
+ if not config or 'result' not in config or config['result'] != 0:
+ return None
+
+ return config
+
+def kea_get_pool_from_subnet_id(config, inet, subnet_id):
+ shared_networks = dict_search_args(config, 'arguments', f'Dhcp{inet}', 'shared-networks')
+
+ if not shared_networks:
+ return None
+
+ for network in shared_networks:
+ if f'subnet{inet}' not in network:
+ continue
+
+ for subnet in network[f'subnet{inet}']:
+ if 'id' in subnet and int(subnet['id']) == int(subnet_id):
+ return network['name']
+
+ return None
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 02:00:32 +0000