# 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. """ 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 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 get_ethertype(ethertype_val): if ethertype_val == '0x88A8': return '802.1ad' elif ethertype_val == '0x8100': return '802.1q' else: raise ConfigError('invalid ethertype "{}"'.format(ethertype_val)) def vlan_to_dict(conf): """ Common used function which will extract VLAN related information from config and represent the result as Python dictionary. Function call's itself recursively if a vif-s/vif-c pair is detected. """ vlan = { 'id': conf.get_level().split()[-1], # get the '100' in 'interfaces bonding bond0 vif-s 100' 'address': [], 'address_remove': [], 'description': '', 'dhcp_client_id': '', 'dhcp_hostname': '', 'dhcpv6_prm_only': False, 'dhcpv6_temporary': False, 'disable': False, 'disable_link_detect': 1, 'mac': '', 'mtu': 1500 } # retrieve configured interface addresses if conf.exists('address'): vlan['address'] = conf.return_values('address') # Determine interface addresses (currently effective) - to determine which # address is no longer valid and needs to be removed from the bond eff_addr = conf.return_effective_values('address') act_addr = conf.return_values('address') vlan['address_remove'] = list_diff(eff_addr, act_addr) # retrieve interface description if conf.exists('description'): vlan['description'] = conf.return_value('description') # get DHCP client identifier if conf.exists('dhcp-options client-id'): vlan['dhcp_client_id'] = conf.return_value('dhcp-options client-id') # DHCP client host name (overrides the system host name) if conf.exists('dhcp-options host-name'): vlan['dhcp_hostname'] = conf.return_value('dhcp-options host-name') # DHCPv6 only acquire config parameters, no address if conf.exists('dhcpv6-options parameters-only'): vlan['dhcpv6_prm_only'] = conf.return_value('dhcpv6-options parameters-only') # DHCPv6 temporary IPv6 address if conf.exists('dhcpv6-options temporary'): vlan['dhcpv6_temporary'] = conf.return_value('dhcpv6-options temporary') # ignore link state changes if conf.exists('disable-link-detect'): vlan['disable_link_detect'] = 2 # disable bond interface if conf.exists('disable'): vlan['disable'] = True # Media Access Control (MAC) address if conf.exists('mac'): vlan['mac'] = conf.return_value('mac') # Maximum Transmission Unit (MTU) if conf.exists('mtu'): vlan['mtu'] = int(conf.return_value('mtu')) # ethertype is mandatory on vif-s nodes and only exists here! # check if this is a vif-s node at all: if conf.get_level().split()[-2] == 'vif-s': vlan['vif_c'] = [] vlan['vif_c_remove'] = [] # ethertype uses a default of 0x88A8 tmp = '0x88A8' if conf.exists('ethertype'): tmp = conf.return_value('ethertype') vlan['ethertype'] = get_ethertype(tmp) # get vif-c interfaces (currently effective) - to determine which vif-c # interface is no longer present and needs to be removed eff_intf = conf.list_effective_nodes('vif-c') act_intf = conf.list_nodes('vif-c') vlan['vif_c_remove'] = list_diff(eff_intf, act_intf) # check if there is a Q-in-Q vlan customer interface # and call this function recursively if conf.exists('vif-c'): cfg_level = conf.get_level() # add new key (vif-c) to dictionary for vif in conf.list_nodes('vif-c'): # set config level to vif interface conf.set_level(cfg_level + ' vif-c ' + vif) vlan['vif_c'].append(vlan_to_dict(conf)) return vlan