# Copyright 2018-2021 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/>. # Important note when you are adding new validation functions: # # The Control class will analyse the signature of the function in this file # and will build the parameters to be passed to it. # # The parameter names "ifname" and "self" will get the Interface name and class # parameters with default will be left unset # all other paramters will receive the value to check def is_ipv6_link_local(addr): """ Check if addrsss is an IPv6 link-local address. Returns True/False """ from ipaddress import ip_interface from vyos.template import is_ipv6 addr = addr.split('%')[0] if is_ipv6(addr): if ip_interface(addr).is_link_local: return True return False def _are_same_ip(one, two): from socket import AF_INET from socket import AF_INET6 from socket import inet_pton from vyos.template import is_ipv4 # compare the binary representation of the IP f_one = AF_INET if is_ipv4(one) else AF_INET6 s_two = AF_INET if is_ipv4(two) else AF_INET6 return inet_pton(f_one, one) == inet_pton(f_one, two) def is_intf_addr_assigned(intf, address) -> bool: """ Verify if the given IPv4/IPv6 address is assigned to specific interface. It can check both a single IP address (e.g. 192.0.2.1 or a assigned CIDR address 192.0.2.1/24. """ from vyos.template import is_ipv4 from netifaces import ifaddresses from netifaces import AF_INET from netifaces import AF_INET6 # check if the requested address type is configured at all # { # 17: [{'addr': '08:00:27:d9:5b:04', 'broadcast': 'ff:ff:ff:ff:ff:ff'}], # 2: [{'addr': '10.0.2.15', 'netmask': '255.255.255.0', 'broadcast': '10.0.2.255'}], # 10: [{'addr': 'fe80::a00:27ff:fed9:5b04%eth0', 'netmask': 'ffff:ffff:ffff:ffff::'}] # } try: ifaces = ifaddresses(intf) except ValueError as e: print(e) return False # determine IP version (AF_INET or AF_INET6) depending on passed address addr_type = AF_INET if is_ipv4(address) else AF_INET6 # Check every IP address on this interface for a match netmask = None if '/' in address: address, netmask = address.split('/') for ip in ifaces.get(addr_type,[]): # ip can have the interface name in the 'addr' field, we need to remove it # {'addr': 'fe80::a00:27ff:fec5:f821%eth2', 'netmask': 'ffff:ffff:ffff:ffff::'} ip_addr = ip['addr'].split('%')[0] if not _are_same_ip(address, ip_addr): continue # we do not have a netmask to compare against, they are the same if not netmask: return True prefixlen = '' if is_ipv4(ip_addr): prefixlen = sum([bin(int(_)).count('1') for _ in ip['netmask'].split('.')]) else: prefixlen = sum([bin(int(_,16)).count('1') for _ in ip['netmask'].split('/')[0].split(':') if _]) if str(prefixlen) == netmask: return True return False def is_addr_assigned(ip_address, vrf=None) -> bool: """ Verify if the given IPv4/IPv6 address is assigned to any interfac """ from netifaces import interfaces from vyos.util import get_interface_config from vyos.util import dict_search for interface in interfaces(): # Check if interface belongs to the requested VRF, if this is not the # case there is no need to proceed with this data set - continue loop # with next element tmp = get_interface_config(interface) if dict_search('master', tmp) != vrf: continue if is_intf_addr_assigned(interface, ip_address): return True return False def is_loopback_addr(addr): """ Check if supplied IPv4/IPv6 address is a loopback address """ from ipaddress import ip_address return ip_address(addr).is_loopback def is_subnet_connected(subnet, primary=False): """ Verify is the given IPv4/IPv6 subnet is connected to any interface on this system. primary check if the subnet is reachable via the primary IP address of this interface, or in other words has a broadcast address configured. ISC DHCP for instance will complain if it should listen on non broadcast interfaces. Return True/False """ from ipaddress import ip_address from ipaddress import ip_network from netifaces import ifaddresses from netifaces import interfaces from netifaces import AF_INET from netifaces import AF_INET6 from vyos.template import is_ipv6 # determine IP version (AF_INET or AF_INET6) depending on passed address addr_type = AF_INET if is_ipv6(subnet): addr_type = AF_INET6 for interface in interfaces(): # check if the requested address type is configured at all if addr_type not in ifaddresses(interface).keys(): continue # An interface can have multiple addresses, but some software components # only support the primary address :( if primary: ip = ifaddresses(interface)[addr_type][0]['addr'] if ip_address(ip) in ip_network(subnet): return True else: # Check every assigned IP address if it is connected to the subnet # in question for ip in ifaddresses(interface)[addr_type]: # remove interface extension (e.g. %eth0) that gets thrown on the end of _some_ addrs addr = ip['addr'].split('%')[0] if ip_address(addr) in ip_network(subnet): return True return False def assert_boolean(b): if int(b) not in (0, 1): raise ValueError(f'Value {b} out of range') def assert_range(value, lower=0, count=3): if int(value, 16) not in range(lower, lower+count): raise ValueError("Value out of range") def assert_list(s, l): if s not in l: o = ' or '.join([f'"{n}"' for n in l]) raise ValueError(f'state must be {o}, got {s}') def assert_number(n): if not str(n).isnumeric(): raise ValueError(f'{n} must be a number') def assert_positive(n, smaller=0): assert_number(n) if int(n) < smaller: raise ValueError(f'{n} is smaller than {smaller}') def assert_mtu(mtu, ifname): assert_number(mtu) import json from vyos.util import cmd out = cmd(f'ip -j -d link show dev {ifname}') # [{"ifindex":2,"ifname":"eth0","flags":["BROADCAST","MULTICAST","UP","LOWER_UP"],"mtu":1500,"qdisc":"pfifo_fast","operstate":"UP","linkmode":"DEFAULT","group":"default","txqlen":1000,"link_type":"ether","address":"08:00:27:d9:5b:04","broadcast":"ff:ff:ff:ff:ff:ff","promiscuity":0,"min_mtu":46,"max_mtu":16110,"inet6_addr_gen_mode":"none","num_tx_queues":1,"num_rx_queues":1,"gso_max_size":65536,"gso_max_segs":65535}] parsed = json.loads(out)[0] min_mtu = int(parsed.get('min_mtu', '0')) # cur_mtu = parsed.get('mtu',0), max_mtu = int(parsed.get('max_mtu', '0')) cur_mtu = int(mtu) if (min_mtu and cur_mtu < min_mtu) or cur_mtu < 68: raise ValueError(f'MTU is too small for interface "{ifname}": {mtu} < {min_mtu}') if (max_mtu and cur_mtu > max_mtu) or cur_mtu > 65536: raise ValueError(f'MTU is too small for interface "{ifname}": {mtu} > {max_mtu}') def assert_mac(m): split = m.split(':') size = len(split) # a mac address consits out of 6 octets if size != 6: raise ValueError(f'wrong number of MAC octets ({size}): {m}') octets = [] try: for octet in split: octets.append(int(octet, 16)) except ValueError: raise ValueError(f'invalid hex number "{octet}" in : {m}') # validate against the first mac address byte if it's a multicast # address if octets[0] & 1: raise ValueError(f'{m} is a multicast MAC address') # overall mac address is not allowed to be 00:00:00:00:00:00 if sum(octets) == 0: raise ValueError('00:00:00:00:00:00 is not a valid MAC address') if octets[:5] == (0, 0, 94, 0, 1): raise ValueError(f'{m} is a VRRP MAC address') def has_address_configured(conf, intf): """ Checks if interface has an address configured. Checks the following config nodes: 'address', 'ipv6 address eui64', 'ipv6 address autoconf' Returns True if interface has address 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} address') or conf.exists(f'{intfpath} ipv6 address autoconf') or conf.exists(f'{intfpath} ipv6 address eui64') ): ret = True conf.set_level(old_level) return ret def has_vrf_configured(conf, intf): """ Checks if interface has a VRF configured. Returns True if interface has VRF configured, False if it doesn't. """ from vyos.ifconfig import Section ret = False old_level = conf.get_level() conf.set_level([]) tmp = ['interfaces', Section.get_config_path(intf), 'vrf'] if conf.exists(tmp): ret = True conf.set_level(old_level) return ret