diff options
| -rwxr-xr-x | src/helpers/vyos-interface-rescan.py | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/src/helpers/vyos-interface-rescan.py b/src/helpers/vyos-interface-rescan.py new file mode 100755 index 000000000..1ac1810e0 --- /dev/null +++ b/src/helpers/vyos-interface-rescan.py @@ -0,0 +1,206 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2021 VyOS maintainers and contributors +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 2 or later as +# published by the Free Software Foundation. +# +# This program 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +# +# + +import os +import stat +import argparse +import logging +import netaddr + +from vyos.configtree import ConfigTree +from vyos.defaults import directories +from vyos.util import get_cfg_group_id + +debug = False + +vyos_udev_dir = directories['vyos_udev_dir'] +vyos_log_dir = directories['log'] +log_file = os.path.splitext(os.path.basename(__file__))[0] +vyos_log_file = os.path.join(vyos_log_dir, log_file) + +logger = logging.getLogger(__name__) +handler = logging.FileHandler(vyos_log_file, mode='a') +formatter = logging.Formatter('%(levelname)s: %(message)s') +handler.setFormatter(formatter) +logger.addHandler(handler) + +passlist = { + '02:07:01' : 'Interlan', + '02:60:60' : '3Com', + '02:60:8c' : '3Com', + '02:a0:c9' : 'Intel', + '02:aa:3c' : 'Olivetti', + '02:cf:1f' : 'CMC', + '02:e0:3b' : 'Prominet', + '02:e6:d3' : 'BTI', + '52:54:00' : 'Realtek', + '52:54:4c' : 'Novell 2000', + '52:54:ab' : 'Realtec', + 'e2:0c:0f' : 'Kingston Technologies' +} + +def is_multicast(addr: netaddr.eui.EUI) -> bool: + return bool(addr.words[0] & 0b1) + +def is_locally_administered(addr: netaddr.eui.EUI) -> bool: + return bool(addr.words[0] & 0b10) + +def is_on_passlist(hwid: str) -> bool: + top = hwid.rsplit(':', 3)[0] + if top in list(passlist): + return True + return False + +def is_persistent(hwid: str) -> bool: + addr = netaddr.EUI(hwid) + if is_multicast(addr): + return False + if is_locally_administered(addr) and not is_on_passlist(hwid): + return False + return True + +def get_wireless_physical_device(intf: str) -> str: + if 'wlan' not in intf: + return '' + try: + tmp = os.readlink(f'/sys/class/net/{intf}/phy80211') + except OSError: + logger.critical(f"Failed to read '/sys/class/net/{intf}/phy80211'") + return '' + phy = os.path.basename(tmp) + logger.info(f"wireless phy is {phy}") + return phy + +def get_interface_type(intf: str) -> str: + if 'eth' in intf: + intf_type = 'ethernet' + elif 'wlan' in intf: + intf_type = 'wireless' + else: + logger.critical('Unrecognized interface type!') + intf_type = '' + return intf_type + +def get_new_interfaces() -> dict: + """ Read any new interface data left in /run/udev/vyos by vyos_net_name + """ + interfaces = {} + + for intf in os.listdir(vyos_udev_dir): + path = os.path.join(vyos_udev_dir, intf) + try: + with open(path) as f: + hwid = f.read().rstrip() + except OSError as e: + logger.error(f"OSError {e}") + continue + interfaces[intf] = hwid + + # reverse sort to simplify insertion in config + interfaces = {key: value for key, value in sorted(interfaces.items(), + reverse=True)} + return interfaces + +def filter_interfaces(intfs: dict) -> dict: + """ Ignore no longer existing interfaces or non-persistent mac addresses + """ + filtered = {} + + for intf, hwid in intfs.items(): + if not os.path.isdir(os.path.join('/sys/class/net', intf)): + continue + if not is_persistent(hwid): + continue + filtered[intf] = hwid + + return filtered + +def interface_rescan(config_path: str): + """ Read new data and update config file + """ + interfaces = get_new_interfaces() + + logger.debug(f"interfaces from udev: {interfaces}") + + interfaces = filter_interfaces(interfaces) + + logger.debug(f"filtered interfaces: {interfaces}") + + try: + with open(config_path) as f: + config_file = f.read() + except OSError as e: + logger.critical(f"OSError {e}") + exit(1) + + config = ConfigTree(config_file) + + for intf, hwid in interfaces.items(): + logger.info(f"Writing '{intf}' '{hwid}' to config file") + intf_type = get_interface_type(intf) + if not intf_type: + continue + if not config.exists(['interfaces', intf_type]): + config.set(['interfaces', intf_type]) + config.set_tag(['interfaces', intf_type]) + config.set(['interfaces', intf_type, intf, 'hw-id'], value=hwid) + + if intf_type == 'wireless': + phy = get_wireless_physical_device(intf) + if not phy: + continue + config.set(['interfaces', intf_type, intf, 'physical-device'], + value=phy) + + try: + with open(config_path, 'w') as f: + f.write(config.to_string()) + except OSError as e: + logger.critical(f"OSError {e}") + +def main(): + global debug + + argparser = argparse.ArgumentParser( + formatter_class=argparse.RawTextHelpFormatter) + argparser.add_argument('configfile', type=str) + argparser.add_argument('--debug', action='store_true') + args = argparser.parse_args() + + if args.debug: + debug = True + logger.setLevel(logging.DEBUG) + else: + logger.setLevel(logging.INFO) + + configfile = args.configfile + + # preserve vyattacfg group write access to running config + os.setgid(get_cfg_group_id()) + os.umask(0o002) + + # log file perms are not automatic; this could be cleaner by moving to a + # logging config file + os.chown(vyos_log_file, 0, get_cfg_group_id()) + os.chmod(vyos_log_file, + stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IWGRP | stat.S_IROTH) + + interface_rescan(configfile) + +if __name__ == '__main__': + main() |