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Diffstat (limited to 'python/vyos/utils/network.py')
| -rw-r--r-- | python/vyos/utils/network.py | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/python/vyos/utils/network.py b/python/vyos/utils/network.py new file mode 100644 index 000000000..55ff29f0c --- /dev/null +++ b/python/vyos/utils/network.py @@ -0,0 +1,427 @@ +# 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/>. + +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 get_protocol_by_name(protocol_name): + """Get protocol number by protocol name + + % get_protocol_by_name('tcp') + % 6 + """ + import socket + try: + protocol_number = socket.getprotobyname(protocol_name) + return protocol_number + except socket.error: + return protocol_name + +def interface_exists(interface) -> bool: + import os + return os.path.exists(f'/sys/class/net/{interface}') + +def is_netns_interface(interface, netns): + from vyos.utils.process import rc_cmd + rc, out = rc_cmd(f'sudo ip netns exec {netns} ip link show dev {interface}') + if rc == 0: + return True + return False + +def get_netns_all() -> list: + from json import loads + from vyos.utils.process import cmd + tmp = loads(cmd('ip --json netns ls')) + return [ netns['name'] for netns in tmp ] + +def get_vrf_members(vrf: str) -> list: + """ + Get list of interface VRF members + :param vrf: str + :return: list + """ + import json + from vyos.utils.process import cmd + if not interface_exists(vrf): + raise ValueError(f'VRF "{vrf}" does not exist!') + output = cmd(f'ip --json --brief link show master {vrf}') + answer = json.loads(output) + interfaces = [] + for data in answer: + if 'ifname' in data: + interfaces.append(data.get('ifname')) + return interfaces + +def get_interface_vrf(interface): + """ Returns VRF of given interface """ + from vyos.utils.dict import dict_search + from vyos.utils.network import get_interface_config + tmp = get_interface_config(interface) + if dict_search('linkinfo.info_slave_kind', tmp) == 'vrf': + return tmp['master'] + return 'default' + +def get_interface_config(interface): + """ Returns the used encapsulation protocol for given interface. + If interface does not exist, None is returned. + """ + if not interface_exists(interface): + return None + from json import loads + from vyos.utils.process import cmd + tmp = loads(cmd(f'ip --detail --json link show dev {interface}'))[0] + return tmp + +def get_interface_address(interface): + """ Returns the used encapsulation protocol for given interface. + If interface does not exist, None is returned. + """ + if not interface_exists(interface): + return None + from json import loads + from vyos.utils.process import cmd + tmp = loads(cmd(f'ip --detail --json addr show dev {interface}'))[0] + return tmp + +def get_interface_namespace(interface: str): + """ + Returns wich netns the interface belongs to + """ + from json import loads + from vyos.utils.process import cmd + + # Bail out early if netns does not exist + tmp = cmd(f'ip --json netns ls') + if not tmp: return None + + for ns in loads(tmp): + netns = f'{ns["name"]}' + # Search interface in each netns + data = loads(cmd(f'ip netns exec {netns} ip --json link show')) + for tmp in data: + if interface == tmp["ifname"]: + return netns + +def is_ipv6_tentative(iface: str, ipv6_address: str) -> bool: + """Check if IPv6 address is in tentative state. + + This function checks if an IPv6 address on a specific network interface is + in the tentative state. IPv6 tentative addresses are not fully configured + and are undergoing Duplicate Address Detection (DAD) to ensure they are + unique on the network. + + Args: + iface (str): The name of the network interface. + ipv6_address (str): The IPv6 address to check. + + Returns: + bool: True if the IPv6 address is tentative, False otherwise. + """ + import json + from vyos.utils.process import rc_cmd + + rc, out = rc_cmd(f'ip -6 --json address show dev {iface} scope global') + if rc: + return False + + data = json.loads(out) + for addr_info in data[0]['addr_info']: + if ( + addr_info.get('local') == ipv6_address and + addr_info.get('tentative', False) + ): + return True + return False + +def is_wwan_connected(interface): + """ Determine if a given WWAN interface, e.g. wwan0 is connected to the + carrier network or not """ + import json + from vyos.utils.process import cmd + + if not interface.startswith('wwan'): + raise ValueError(f'Specified interface "{interface}" is not a WWAN interface') + + # ModemManager is required for connection(s) - if service is not running, + # there won't be any connection at all! + if not is_systemd_service_active('ModemManager.service'): + return False + + modem = interface.lstrip('wwan') + + tmp = cmd(f'mmcli --modem {modem} --output-json') + tmp = json.loads(tmp) + + # return True/False if interface is in connected state + return dict_search('modem.generic.state', tmp) == 'connected' + +def get_bridge_fdb(interface): + """ Returns the forwarding database entries for a given interface """ + if not interface_exists(interface): + return None + from json import loads + from vyos.utils.process import cmd + tmp = loads(cmd(f'bridge -j fdb show dev {interface}')) + return tmp + +def get_all_vrfs(): + """ Return a dictionary of all system wide known VRF instances """ + from json import loads + from vyos.utils.process import cmd + tmp = loads(cmd('ip --json vrf list')) + # Result is of type [{"name":"red","table":1000},{"name":"blue","table":2000}] + # so we will re-arrange it to a more nicer representation: + # {'red': {'table': 1000}, 'blue': {'table': 2000}} + data = {} + for entry in tmp: + name = entry.pop('name') + data[name] = entry + return data + +def mac2eui64(mac, prefix=None): + """ + Convert a MAC address to a EUI64 address or, with prefix provided, a full + IPv6 address. + Thankfully copied from https://gist.github.com/wido/f5e32576bb57b5cc6f934e177a37a0d3 + """ + import re + from ipaddress import ip_network + # http://tools.ietf.org/html/rfc4291#section-2.5.1 + eui64 = re.sub(r'[.:-]', '', mac).lower() + eui64 = eui64[0:6] + 'fffe' + eui64[6:] + eui64 = hex(int(eui64[0:2], 16) ^ 2)[2:].zfill(2) + eui64[2:] + + if prefix is None: + return ':'.join(re.findall(r'.{4}', eui64)) + else: + try: + net = ip_network(prefix, strict=False) + euil = int('0x{0}'.format(eui64), 16) + return str(net[euil]) + except: # pylint: disable=bare-except + return + +def check_port_availability(ipaddress, port, protocol): + """ + Check if port is available and not used by any service + Return False if a port is busy or IP address does not exists + Should be used carefully for services that can start listening + dynamically, because IP address may be dynamic too + """ + from socketserver import TCPServer, UDPServer + from ipaddress import ip_address + + # verify arguments + try: + ipaddress = ip_address(ipaddress).compressed + except: + raise ValueError(f'The {ipaddress} is not a valid IPv4 or IPv6 address') + if port not in range(1, 65536): + raise ValueError(f'The port number {port} is not in the 1-65535 range') + if protocol not in ['tcp', 'udp']: + raise ValueError(f'The protocol {protocol} is not supported. Only tcp and udp are allowed') + + # check port availability + try: + if protocol == 'tcp': + server = TCPServer((ipaddress, port), None, bind_and_activate=True) + if protocol == 'udp': + server = UDPServer((ipaddress, port), None, bind_and_activate=True) + server.server_close() + except Exception as e: + # errno.h: + #define EADDRINUSE 98 /* Address already in use */ + if e.errno == 98: + return False + + return True + +def is_listen_port_bind_service(port: int, service: str) -> bool: + """Check if listen port bound to expected program name + :param port: Bind port + :param service: Program name + :return: bool + + Example: + % is_listen_port_bind_service(443, 'nginx') + True + % is_listen_port_bind_service(443, 'ocserv-main') + False + """ + from psutil import net_connections as connections + from psutil import Process as process + for connection in connections(): + addr = connection.laddr + pid = connection.pid + pid_name = process(pid).name() + pid_port = addr.port + if service == pid_name and port == pid_port: + return True + return False + +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 is_addr_assigned(ip_address, vrf=None) -> bool: + """ Verify if the given IPv4/IPv6 address is assigned to any interface """ + from netifaces import interfaces + from vyos.utils.network import get_interface_config + from vyos.utils.dict 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_intf_addr_assigned(ifname: str, addr: str, netns: str=None) -> 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. + """ + import json + import jmespath + + from vyos.utils.process import rc_cmd + from ipaddress import ip_interface + + netns_cmd = f'ip netns exec {netns}' if netns else '' + rc, out = rc_cmd(f'{netns_cmd} ip --json address show dev {ifname}') + if rc == 0: + json_out = json.loads(out) + addresses = jmespath.search("[].addr_info[].{family: family, address: local, prefixlen: prefixlen}", json_out) + for address_info in addresses: + family = address_info['family'] + address = address_info['address'] + prefixlen = address_info['prefixlen'] + # Remove the interface name if present in the given address + if '%' in addr: + addr = addr.split('%')[0] + interface = ip_interface(f"{address}/{prefixlen}") + if ip_interface(addr) == interface or address == addr: + 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_wireguard_key_pair(private_key: str, public_key:str) -> bool: + """ + Checks if public/private keys are keypair + :param private_key: Wireguard private key + :type private_key: str + :param public_key: Wireguard public key + :type public_key: str + :return: If public/private keys are keypair returns True else False + :rtype: bool + """ + from vyos.utils.process import cmd + gen_public_key = cmd('wg pubkey', input=private_key) + if gen_public_key == public_key: + return True + else: + return False + +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 is_afi_configured(interface, afi): + """ Check if given address family is configured, or in other words - an IP + address is assigned to the interface. """ + from netifaces import ifaddresses + from netifaces import AF_INET + from netifaces import AF_INET6 + + if afi not in [AF_INET, AF_INET6]: + raise ValueError('Address family must be in [AF_INET, AF_INET6]') + + try: + addresses = ifaddresses(interface) + except ValueError as e: + print(e) + return False + + return afi in addresses |