# Copyright 2019 VyOS maintainers and contributors # # 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 . """ A library for retrieving value dicts from VyOS configs in a declarative fashion. """ import os from vyos.util import dict_search from vyos.xml import defaults from vyos import ConfigError def retrieve_config(path_hash, base_path, config): """ Retrieves a VyOS config as a dict according to a declarative description The description dict, passed in the first argument, must follow this format: ``field_name : ``. Supported types are: ``str`` (for normal nodes), ``list`` (returns a list of strings, for multi nodes), ``bool`` (returns True if valueless node exists), ``dict`` (for tag nodes, returns a dict indexed by node names, according to description in the third item of the tuple). Args: path_hash (dict): Declarative description of the config to retrieve base_path (list): A base path to prepend to all option paths config (vyos.config.Config): A VyOS config object Returns: dict: config dict """ config_hash = {} for k in path_hash: if type(path_hash[k]) != tuple: raise ValueError("In field {0}: expected a tuple, got a value {1}".format(k, str(path_hash[k]))) if len(path_hash[k]) < 2: raise ValueError("In field {0}: field description must be a tuple of at least two items, path (list) and type".format(k)) path = path_hash[k][0] if type(path) != list: raise ValueError("In field {0}: path must be a list, not a {1}".format(k, type(path))) typ = path_hash[k][1] if type(typ) != type: raise ValueError("In field {0}: type must be a type, not a {1}".format(k, type(typ))) path = base_path + path path_str = " ".join(path) if typ == str: config_hash[k] = config.return_value(path_str) elif typ == list: config_hash[k] = config.return_values(path_str) elif typ == bool: config_hash[k] = config.exists(path_str) elif typ == dict: try: inner_hash = path_hash[k][2] except IndexError: raise ValueError("The type of the \'{0}\' field is dict, but inner options hash is missing from the tuple".format(k)) config_hash[k] = {} nodes = config.list_nodes(path_str) for node in nodes: config_hash[k][node] = retrieve_config(inner_hash, path + [node], config) return config_hash def dict_merge(source, destination): """ Merge two dictionaries. Only keys which are not present in destination will be copied from source, anything else will be kept untouched. Function will return a new dict which has the merged key/value pairs. """ from copy import deepcopy tmp = deepcopy(destination) for key, value in source.items(): if key not in tmp: tmp[key] = value elif isinstance(source[key], dict): tmp[key] = dict_merge(source[key], tmp[key]) return tmp def list_diff(first, second): """ Diff two dictionaries and return only unique items """ second = set(second) return [item for item in first if item not in second] def leaf_node_changed(conf, path): """ Check if a leaf node was altered. If it has been altered - values has been changed, or it was added/removed, we will return a list containing the old value(s). If nothing has been changed, None is returned """ from vyos.configdiff import get_config_diff D = get_config_diff(conf, key_mangling=('-', '_')) D.set_level(conf.get_level()) (new, old) = D.get_value_diff(path) if new != old: if isinstance(old, str): return [old] elif isinstance(old, list): if isinstance(new, str): new = [new] elif isinstance(new, type(None)): new = [] return list_diff(old, new) return None def node_changed(conf, path): """ Check if a leaf node was altered. If it has been altered - values has been changed, or it was added/removed, we will return the old value. If nothing has been changed, None is returned """ from vyos.configdiff import get_config_diff, Diff D = get_config_diff(conf, key_mangling=('-', '_')) D.set_level(conf.get_level()) # get_child_nodes() will return dict_keys(), mangle this into a list with PEP448 keys = D.get_child_nodes_diff(path, expand_nodes=Diff.DELETE)['delete'].keys() return list(keys) def get_removed_vlans(conf, dict): """ Common function to parse a dictionary retrieved via get_config_dict() and determine any added/removed VLAN interfaces - be it 802.1q or Q-in-Q. """ from vyos.configdiff import get_config_diff, Diff # Check vif, vif-s/vif-c VLAN interfaces for removal D = get_config_diff(conf, key_mangling=('-', '_')) D.set_level(conf.get_level()) # get_child_nodes() will return dict_keys(), mangle this into a list with PEP448 keys = D.get_child_nodes_diff(['vif'], expand_nodes=Diff.DELETE)['delete'].keys() if keys: dict.update({'vif_remove': [*keys]}) # get_child_nodes() will return dict_keys(), mangle this into a list with PEP448 keys = D.get_child_nodes_diff(['vif-s'], expand_nodes=Diff.DELETE)['delete'].keys() if keys: dict.update({'vif_s_remove': [*keys]}) for vif in dict.get('vif_s', {}).keys(): keys = D.get_child_nodes_diff(['vif-s', vif, 'vif-c'], expand_nodes=Diff.DELETE)['delete'].keys() if keys: dict.update({'vif_s': { vif : {'vif_c_remove': [*keys]}}}) return dict def T2665_set_dhcpv6pd_defaults(config_dict): """ Properly configure DHCPv6 default options in the dictionary. If there is no DHCPv6 configured at all, it is safe to remove the entire configuration. """ # As this is the same for every interface type it is safe to assume this # for ethernet pd_defaults = defaults(['interfaces', 'ethernet', 'dhcpv6-options', 'pd']) # Implant default dictionary for DHCPv6-PD instances if dict_search('dhcpv6_options.pd.length', config_dict): del config_dict['dhcpv6_options']['pd']['length'] for pd in (dict_search('dhcpv6_options.pd', config_dict) or []): config_dict['dhcpv6_options']['pd'][pd] = dict_merge(pd_defaults, config_dict['dhcpv6_options']['pd'][pd]) return config_dict def is_member(conf, interface, intftype=None): """ Checks if passed interface is member of other interface of specified type. intftype is optional, if not passed it will search all known types (currently bridge and bonding) Returns: None -> Interface is not a member interface name -> Interface is a member of this interface False -> interface type cannot have members """ ret_val = None intftypes = ['bonding', 'bridge'] if intftype not in intftypes + [None]: raise ValueError(( f'unknown interface type "{intftype}" or it cannot ' f'have member interfaces')) intftype = intftypes if intftype == None else [intftype] # set config level to root old_level = conf.get_level() conf.set_level([]) for iftype in intftype: base = ['interfaces', iftype] for intf in conf.list_nodes(base): member = base + [intf, 'member', 'interface', interface] if conf.exists(member): tmp = conf.get_config_dict(member, key_mangling=('-', '_'), get_first_key=True) ret_val = {intf : tmp} old_level = conf.set_level(old_level) return ret_val def has_vlan_subinterface_configured(conf, intf): """ Checks if interface has an VLAN subinterface configured. Checks the following config nodes: 'vif', 'vif-s' Returns True if interface has VLAN subinterface configured, False if it doesn't. """ from vyos.ifconfig import Section ret = False old_level = conf.get_level() conf.set_level([]) intfpath = 'interfaces ' + Section.get_config_path(intf) if ( conf.exists(f'{intfpath} vif') or conf.exists(f'{intfpath} vif-s')): ret = True conf.set_level(old_level) return ret def is_source_interface(conf, interface, intftype=None): """ Checks if passed interface is configured as source-interface of other interfaces of specified type. intftype is optional, if not passed it will search all known types (currently pppoe, macsec, pseudo-ethernet, tunnel and vxlan) Returns: None -> Interface is not a member interface name -> Interface is a member of this interface False -> interface type cannot have members """ ret_val = None intftypes = ['macsec', 'pppoe', 'pseudo-ethernet', 'tunnel', 'vxlan'] if intftype not in intftypes + [None]: raise ValueError(f'unknown interface type "{intftype}" or it can not ' 'have a source-interface') intftype = intftypes if intftype == None else [intftype] # set config level to root old_level = conf.get_level() conf.set_level([]) for it in intftype: base = ['interfaces', it] for intf in conf.list_nodes(base): lower_intf = base + [intf, 'source-interface'] if conf.exists(lower_intf) and interface in conf.return_values(lower_intf): ret_val = intf break old_level = conf.set_level(old_level) return ret_val def get_interface_dict(config, base, ifname=''): """ Common utility function to retrieve and mangle the interfaces configuration from the CLI input nodes. All interfaces have a common base where value retrival is identical. This function must be used whenever possible when working on the interfaces node! Return a dictionary with the necessary interface config keys. """ if not ifname: # determine tagNode instance if 'VYOS_TAGNODE_VALUE' not in os.environ: raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified') ifname = os.environ['VYOS_TAGNODE_VALUE'] # retrieve interface default values default_values = defaults(base) # We take care about VLAN (vif, vif-s, vif-c) default values later on when # parsing vlans in default dict and merge the "proper" values in correctly, # see T2665. for vif in ['vif', 'vif_s']: if vif in default_values: del default_values[vif] # setup config level which is extracted in get_removed_vlans() config.set_level(base + [ifname]) dict = config.get_config_dict([], key_mangling=('-', '_'), get_first_key=True) # Check if interface has been removed. We must use exists() as get_config_dict() # will always return {} - even when an empty interface node like # +macsec macsec1 { # +} # exists. if not config.exists([]): dict.update({'deleted' : ''}) # Add interface instance name into dictionary dict.update({'ifname': ifname}) # XXX: T2665: When there is no DHCPv6-PD configuration given, we can safely # remove the default values from the dict. if 'dhcpv6_options' not in dict: if 'dhcpv6_options' in default_values: del default_values['dhcpv6_options'] # We have gathered the dict representation of the CLI, but there are # default options which we need to update into the dictionary # retrived. dict = dict_merge(default_values, dict) # XXX: T2665: blend in proper DHCPv6-PD default values dict = T2665_set_dhcpv6pd_defaults(dict) # Check if we are a member of a bridge device bridge = is_member(config, ifname, 'bridge') if bridge: dict.update({'is_bridge_member' : bridge}) # Check if we are a member of a bond device bond = is_member(config, ifname, 'bonding') if bond: dict.update({'is_bond_member' : bond}) # Some interfaces come with a source_interface which must also not be part # of any other bond or bridge interface as it is exclusivly assigned as the # Kernels "lower" interface to this new "virtual/upper" interface. if 'source_interface' in dict: # Check if source interface is member of another bridge tmp = is_member(config, dict['source_interface'], 'bridge') if tmp: dict.update({'source_interface_is_bridge_member' : tmp}) # Check if source interface is member of another bridge tmp = is_member(config, dict['source_interface'], 'bonding') if tmp: dict.update({'source_interface_is_bond_member' : tmp}) mac = leaf_node_changed(config, ['mac']) if mac: dict.update({'mac_old' : mac}) eui64 = leaf_node_changed(config, ['ipv6', 'address', 'eui64']) if eui64: tmp = dict_search('ipv6.address', dict) if not tmp: dict.update({'ipv6': {'address': {'eui64_old': eui64}}}) else: dict['ipv6']['address'].update({'eui64_old': eui64}) # Implant default dictionary in vif/vif-s VLAN interfaces. Values are # identical for all types of VLAN interfaces as they all include the same # XML definitions which hold the defaults. for vif, vif_config in dict.get('vif', {}).items(): default_vif_values = defaults(base + ['vif']) # XXX: T2665: When there is no DHCPv6-PD configuration given, we can safely # remove the default values from the dict. if not 'dhcpv6_options' in vif_config: del default_vif_values['dhcpv6_options'] dict['vif'][vif] = dict_merge(default_vif_values, vif_config) # XXX: T2665: blend in proper DHCPv6-PD default values dict['vif'][vif] = T2665_set_dhcpv6pd_defaults(dict['vif'][vif]) # Check if we are a member of a bridge device bridge = is_member(config, f'{ifname}.{vif}', 'bridge') if bridge: dict['vif'][vif].update({'is_bridge_member' : bridge}) for vif_s, vif_s_config in dict.get('vif_s', {}).items(): default_vif_s_values = defaults(base + ['vif-s']) # XXX: T2665: we only wan't the vif-s defaults - do not care about vif-c if 'vif_c' in default_vif_s_values: del default_vif_s_values['vif_c'] # XXX: T2665: When there is no DHCPv6-PD configuration given, we can safely # remove the default values from the dict. if not 'dhcpv6_options' in vif_s_config: del default_vif_s_values['dhcpv6_options'] dict['vif_s'][vif_s] = dict_merge(default_vif_s_values, vif_s_config) # XXX: T2665: blend in proper DHCPv6-PD default values dict['vif_s'][vif_s] = T2665_set_dhcpv6pd_defaults( dict['vif_s'][vif_s]) # Check if we are a member of a bridge device bridge = is_member(config, f'{ifname}.{vif_s}', 'bridge') if bridge: dict['vif_s'][vif_s].update({'is_bridge_member' : bridge}) for vif_c, vif_c_config in vif_s_config.get('vif_c', {}).items(): default_vif_c_values = defaults(base + ['vif-s', 'vif-c']) # XXX: T2665: When there is no DHCPv6-PD configuration given, we can safely # remove the default values from the dict. if not 'dhcpv6_options' in vif_c_config: del default_vif_c_values['dhcpv6_options'] dict['vif_s'][vif_s]['vif_c'][vif_c] = dict_merge( default_vif_c_values, vif_c_config) # XXX: T2665: blend in proper DHCPv6-PD default values dict['vif_s'][vif_s]['vif_c'][vif_c] = T2665_set_dhcpv6pd_defaults( dict['vif_s'][vif_s]['vif_c'][vif_c]) # Check if we are a member of a bridge device bridge = is_member(config, f'{ifname}.{vif_s}.{vif_c}', 'bridge') if bridge: dict['vif_s'][vif_s]['vif_c'][vif_c].update( {'is_bridge_member' : bridge}) # Check vif, vif-s/vif-c VLAN interfaces for removal dict = get_removed_vlans(config, dict) return dict def get_accel_dict(config, base, chap_secrets): """ Common utility function to retrieve and mangle the Accel-PPP configuration from different CLI input nodes. All Accel-PPP services have a common base where value retrival is identical. This function must be used whenever possible when working with Accel-PPP services! Return a dictionary with the necessary interface config keys. """ from vyos.util import get_half_cpus from vyos.validate import is_ipv4 dict = config.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True) # We have gathered the dict representation of the CLI, but there are default # options which we need to update into the dictionary retrived. default_values = defaults(base) # defaults include RADIUS server specifics per TAG node which need to be # added to individual RADIUS servers instead - so we can simply delete them if dict_search('authentication.radius.server', default_values): del default_values['authentication']['radius']['server'] # defaults include static-ip address per TAG node which need to be added to # individual local users instead - so we can simply delete them if dict_search('authentication.local_users.username', default_values): del default_values['authentication']['local_users']['username'] dict = dict_merge(default_values, dict) # set CPUs cores to process requests dict.update({'thread_count' : get_half_cpus()}) # we need to store the path to the secrets file dict.update({'chap_secrets_file' : chap_secrets}) # We can only have two IPv4 and three IPv6 nameservers - also they are # configured in a different way in the configuration, this is why we split # the configuration if 'name_server' in dict: ns_v4 = [] ns_v6 = [] for ns in dict['name_server']: if is_ipv4(ns): ns_v4.append(ns) else: ns_v6.append(ns) dict.update({'name_server_ipv4' : ns_v4, 'name_server_ipv6' : ns_v6}) del dict['name_server'] # Add individual RADIUS server default values if dict_search('authentication.radius.server', dict): default_values = defaults(base + ['authentication', 'radius', 'server']) for server in dict_search('authentication.radius.server', dict): dict['authentication']['radius']['server'][server] = dict_merge( default_values, dict['authentication']['radius']['server'][server]) # Check option "disable-accounting" per server and replace default value from '1813' to '0' # set vpn sstp authentication radius server x.x.x.x disable-accounting if 'disable_accounting' in dict['authentication']['radius']['server'][server]: dict['authentication']['radius']['server'][server]['acct_port'] = '0' # Add individual local-user default values if dict_search('authentication.local_users.username', dict): default_values = defaults(base + ['authentication', 'local-users', 'username']) for username in dict_search('authentication.local_users.username', dict): dict['authentication']['local_users']['username'][username] = dict_merge( default_values, dict['authentication']['local_users']['username'][username]) return dict