#!/usr/bin/env python3 # # Copyright (C) 2018-2020 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 from sys import exit from ipaddress import ip_address, ip_interface, IPv4Interface, IPv6Interface, IPv4Address, IPv6Address from json import dumps from pathlib import Path import vyos.config from vyos import ConfigError from vyos.util import call from vyos.template import render from vyos.ifconfig.vrrp import VRRP from vyos import airbag airbag.enable() def get_config(): vrrp_groups = [] sync_groups = [] config = vyos.config.Config() # Get the VRRP groups for group_name in config.list_nodes("high-availability vrrp group"): config.set_level("high-availability vrrp group {0}".format(group_name)) # Retrieve the values group = {"preempt": True, "use_vmac": False, "disable": False} if config.exists("disable"): group["disable"] = True group["name"] = group_name group["vrid"] = config.return_value("vrid") group["interface"] = config.return_value("interface") group["description"] = config.return_value("description") group["advertise_interval"] = config.return_value("advertise-interval") group["priority"] = config.return_value("priority") group["hello_source"] = config.return_value("hello-source-address") group["peer_address"] = config.return_value("peer-address") group["sync_group"] = config.return_value("sync-group") group["preempt_delay"] = config.return_value("preempt-delay") group["virtual_addresses"] = config.return_values("virtual-address") group["auth_password"] = config.return_value("authentication password") group["auth_type"] = config.return_value("authentication type") group["health_check_script"] = config.return_value("health-check script") group["health_check_interval"] = config.return_value("health-check interval") group["health_check_count"] = config.return_value("health-check failure-count") group["master_script"] = config.return_value("transition-script master") group["backup_script"] = config.return_value("transition-script backup") group["fault_script"] = config.return_value("transition-script fault") group["stop_script"] = config.return_value("transition-script stop") if config.exists("no-preempt"): group["preempt"] = False if config.exists("rfc3768-compatibility"): group["use_vmac"] = True # Substitute defaults where applicable if not group["advertise_interval"]: group["advertise_interval"] = 1 if not group["priority"]: group["priority"] = 100 if not group["preempt_delay"]: group["preempt_delay"] = 0 if not group["health_check_interval"]: group["health_check_interval"] = 60 if not group["health_check_count"]: group["health_check_count"] = 3 # FIXUP: translate our option for auth type to keepalived's syntax # for simplicity if group["auth_type"]: if group["auth_type"] == "plaintext-password": group["auth_type"] = "PASS" else: group["auth_type"] = "AH" vrrp_groups.append(group) config.set_level("") # Get the sync group used for conntrack-sync conntrack_sync_group = None if config.exists("service conntrack-sync failover-mechanism vrrp"): conntrack_sync_group = config.return_value("service conntrack-sync failover-mechanism vrrp sync-group") # Get the sync groups for sync_group_name in config.list_nodes("high-availability vrrp sync-group"): config.set_level("high-availability vrrp sync-group {0}".format(sync_group_name)) sync_group = {"conntrack_sync": False} sync_group["name"] = sync_group_name sync_group["members"] = config.return_values("member") if conntrack_sync_group: if conntrack_sync_group == sync_group_name: sync_group["conntrack_sync"] = True # add transition script configuration sync_group["master_script"] = config.return_value("transition-script master") sync_group["backup_script"] = config.return_value("transition-script backup") sync_group["fault_script"] = config.return_value("transition-script fault") sync_group["stop_script"] = config.return_value("transition-script stop") sync_groups.append(sync_group) # create a file with dict with proposed configuration with open("{}.temp".format(VRRP.location['vyos']), 'w') as dict_file: dict_file.write(dumps({'vrrp_groups': vrrp_groups, 'sync_groups': sync_groups})) return (vrrp_groups, sync_groups) def verify(data): vrrp_groups, sync_groups = data for group in vrrp_groups: # Check required fields if not group["vrid"]: raise ConfigError("vrid is required but not set in VRRP group {0}".format(group["name"])) if not group["interface"]: raise ConfigError("interface is required but not set in VRRP group {0}".format(group["name"])) if not group["virtual_addresses"]: raise ConfigError("virtual-address is required but not set in VRRP group {0}".format(group["name"])) if group["auth_password"] and (not group["auth_type"]): raise ConfigError("authentication type is required but not set in VRRP group {0}".format(group["name"])) # Keepalived doesn't allow mixing IPv4 and IPv6 in one group, so we mirror that restriction # XXX: filter on map object is destructive, so we force it to list. # Additionally, filter objects always evaluate to True, empty or not, # so we force them to lists as well. vaddrs = list(map(lambda i: ip_interface(i), group["virtual_addresses"])) vaddrs4 = list(filter(lambda x: isinstance(x, IPv4Interface), vaddrs)) vaddrs6 = list(filter(lambda x: isinstance(x, IPv6Interface), vaddrs)) if vaddrs4 and vaddrs6: raise ConfigError("VRRP group {0} mixes IPv4 and IPv6 virtual addresses, this is not allowed. Create separate groups for IPv4 and IPv6".format(group["name"])) if vaddrs4: if group["hello_source"]: hsa = ip_address(group["hello_source"]) if isinstance(hsa, IPv6Address): raise ConfigError("VRRP group {0} uses IPv4 but its hello-source-address is IPv6".format(group["name"])) if group["peer_address"]: pa = ip_address(group["peer_address"]) if isinstance(pa, IPv6Address): raise ConfigError("VRRP group {0} uses IPv4 but its peer-address is IPv6".format(group["name"])) if vaddrs6: if group["hello_source"]: hsa = ip_address(group["hello_source"]) if isinstance(hsa, IPv4Address): raise ConfigError("VRRP group {0} uses IPv6 but its hello-source-address is IPv4".format(group["name"])) if group["peer_address"]: pa = ip_address(group["peer_address"]) if isinstance(pa, IPv4Address): raise ConfigError("VRRP group {0} uses IPv6 but its peer-address is IPv4".format(group["name"])) # Disallow same VRID on multiple interfaces _groups = sorted(vrrp_groups, key=(lambda x: x["interface"])) count = len(_groups) - 1 index = 0 while (index < count): if (_groups[index]["vrid"] == _groups[index + 1]["vrid"]) and (_groups[index]["interface"] == _groups[index + 1]["interface"]): raise ConfigError("VRID {0} is used in groups {1} and {2} that both use interface {3}. Groups on the same interface must use different VRIDs".format( _groups[index]["vrid"], _groups[index]["name"], _groups[index + 1]["name"], _groups[index]["interface"])) else: index += 1 # Check sync groups vrrp_group_names = list(map(lambda x: x["name"], vrrp_groups)) for sync_group in sync_groups: for m in sync_group["members"]: if not (m in vrrp_group_names): raise ConfigError("VRRP sync-group {0} refers to VRRP group {1}, but group {1} does not exist".format(sync_group["name"], m)) def generate(data): vrrp_groups, sync_groups = data # Remove disabled groups from the sync group member lists for sync_group in sync_groups: for member in sync_group["members"]: g = list(filter(lambda x: x["name"] == member, vrrp_groups))[0] if g["disable"]: print("Warning: ignoring disabled VRRP group {0} in sync-group {1}".format(g["name"], sync_group["name"])) # Filter out disabled groups vrrp_groups = list(filter(lambda x: x["disable"] is not True, vrrp_groups)) render(VRRP.location['config'], 'vrrp/keepalived.conf.tmpl', {"groups": vrrp_groups, "sync_groups": sync_groups}) render(VRRP.location['daemon'], 'vrrp/daemon.tmpl', {}) return None def apply(data): vrrp_groups, sync_groups = data if vrrp_groups: # safely rename a temporary file with configuration dict try: dict_file = Path("{}.temp".format(VRRP.location['vyos'])) dict_file.rename(Path(VRRP.location['vyos'])) except Exception as err: print("Unable to rename the file with keepalived config for FIFO pipe: {}".format(err)) if not VRRP.is_running(): print("Starting the VRRP process") ret = call("systemctl restart keepalived.service") else: print("Reloading the VRRP process") ret = call("systemctl reload keepalived.service") if ret != 0: raise ConfigError("keepalived failed to start") else: # VRRP is removed in the commit print("Stopping the VRRP process") call("systemctl stop keepalived.service") os.unlink(VRRP.location['daemon']) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print("VRRP error: {0}".format(str(e))) exit(1)